ルーツブロワの整備・修理・補修・部品製作ならKBKエンジニアリングへ

Specialist in Maintenance and Service for Roots Blowers KBK Engineering Co., Ltd.

40-plus year record of performance in maintenance and service, fabrication, and repairs
  • Clearance adjustments
  • Repairs for shafts
  • Fabrication of gears
  • Dynamic balance corrections
  • Repairs for fitting parts
  • Repairs for sliding parts
  • Maintenance and service for large machines
  • Repairs for side covers
  • Clearance restoration
  • Repairs for impellers
  • Fabrication of parts
  • Modification
  • Replacement of consumable parts, etc.
Manufacturers we support
  • Dresser
  • TAIKO KIKAI INDUSTRIES
  • ANLET
  • ITO Engineering
  • Unozawa-gumi Iron Works
  • Fuji Alloy Iron Works
  • Overseas-made roots blowers (Italy, Taiwan), etc.
  • Click here for inquiries
  • ISO9001のロゴ
    Acquired ISO9001:2015 certificationHead Office Factory and Higashizuka Factory
    *International standard for quality management systems

サムネイル「ルーツブロワー整備の特徴」

Features of Maintenance and Service for Roots Blowers

A roots blower is a machine that conveys fluids and intakes air with multiple blades called impellers, which rotate in a small clearance. The roots blower has a variety of sizes, ranging from those that can be mounted on desks to those that weigh a dozen tons. The pumping capacity is mainly determined by the size of the entire machine, the pressure, and the rotation speed of the impeller, and the fluid is pushed by a force greater than the pressure existing on the discharge side. Therefore, in order to reduce pressure loss and accomplish efficient conveyance, it is necessary to maintain a sealed structure that prevents leakage and minimize the internal clearance of the roots blower. An increase in vibration and noise, and a dropping pressure or rising temperature during operation indicate that it’s time for maintenance and service. The pumping capacity can be maintained by replacing parts that directly affect operation, such as couplings, bearings and gears, and parts that prevent leakage, such as oil seals and mechanical seals, at the right time.

KBK Engineering’s Maintenance and service for Roots Blowers

We focus on maintenance and service for large machines as well as small and medium-sized machines. We understand all the work from receiving the truck, disassembling work after that, subsequent cleaning, inspection to identify the defective portion and non-defective portion, procurement capability to obtain necessary parts, assembly and careful adjustment to improve deteriorated performance, transportation arrangements after completion, and shipment.

We also have techniques to perform the most appropriate maintenance and service. We offer integrated service from hard-facing necessary for repairing fitting parts, surface treatment such as thermal-spraying and plating, various machining processes to restore shape and function, dynamic balance for stable operation without vibration, to roots blower condition confirmation and diagnosis. To ensure proper clearance inside the machine, which is the most important, each component must have the correct dimensions and mechanical elements. For this reason, we examine repairs, considering not only the fitting of disassembled parts, but also the geometric tolerances, and conduct complex machining in cooperation with Kurashiki Boring Kiko, our group company, to accomplish high-quality repairs.

Even in situations where repairs are not sufficient, such as dynamic balance corrections necessary to rotate, without vibrations, impellers which become thinned with wear caused by conveyance fluids or foreign substances that have been caught, and fabrication of new components that have been damaged to the point where they cannot be reused, we not only extend the service life of roots blowers, but also conduct maintenance and service for roots blowers exceeding 10 tons, and repair the fitting parts without removing the shaft from the impeller, thereby minimizing the shutdown of operations while ensuring accuracy.

Assembled with properly repaired parts, the roots blower rotates smoothly without vibration, reducing noise and stabilizing and improving conveyance capacity to improve productivity. In addition to abnormalities directly caused by the roots blower, such as reduced performance due to increased pressure loss of the conveyance fluid, rising temperatures of the bearing, abnormal noise and vibration, indicators for determining the timing of maintenance and service include process abnormalities such as reduced flow rate and pressure of the conveyance fluid and detection of foreign substances in downstream processes.

Impeller
Repairs for fitting parts, fabrication of new shafts, welding forming for cracks, dynamic balance corrections, labyrinth forming
Side Cover
Repairs for fitting parts, labyrinth forming, clearance corrections, repairs for bearing parts
Bearing Case
Repairs for bearing outer ring fitting parts, labyrinth forming, geometric tolerance corrections, fabrication of new bearing case
Casing
Crack welding, clearance corrections, internal cleaning, repairs

As shown by the above wide-ranging record of maintenance and service of overseas-made machines and large machines, as well as request content, we are a maintenance and service company that can handle the maintenance of roots blowers in-house or in conjunction with our partner company.

Practical Examples of Service, Maintenance, and Repairs

Cases for frequently requested service, maintenance, and repairs.

整備・メンテナンス・修理の 実施例「ルーツブロワ 整備全般」

General maintenance and service for roots blowers

Disassembly begins by observing the clearance and condition between the impellers and the case. Roots blowers, which convey fluids at constant pressure and volume, are carefully serviced to check for wear, contact marks, and smooth impeller movement. The fitting parts of important components such as bearings and oil seals are carefully measured and repaired after analysis of the measured values and careful consideration of the effect on the clearance. If this is not possible, we fabricate new components to restore performance.

Record of performance in maintenance and service
Dresser, TAIKO KIKAI INDUSTRIES, ANLET, ITO Engineering, Unozawa-gumi Iron Works, Fuji Alloy Iron Works, Overseas-made roots blowers (Italy, Taiwan), etc.

整備・メンテナンス・修理の 実施例「ベアリング」

Bearings

Bearing fittings are the most important part of the operating performance of the roots blower. Their main purpose is to provide stable fluid pumping capacity through smooth rotation, and its primary function is to maintain appropriate clearance between impellers, between the impeller and the case, and between the impeller and the side cover. Abnormality of the fitting parts causes a locally rising temperature in the component. The result is usually observed as contact marks on the case and impeller, but in serious cases, it causes thinning and bending of the shaft and deformation of the bearing case. Sudden abnormalities in the bearing section can spread to the gear and case, causing contact between the parts and leading to serious damage.

整備・メンテナンス・修理の 実施例「オイルシール」

Oil seals

Oil seals, which are consumables, are replaced when excessive grease is supplied or disassembly is required for some reason. If the oil seal fitting part is not smooth enough, or if there are lip marks or scratches on the shaft, this situation can be observed as an obvious grease leak, causing heat generation and seizure of the sealing bearing. We examine the most suitable repair method according to the conveyance fluid and the surface condition of the defective part, and perform the repair using the method that produces the best result.

整備・メンテナンス・修理の 実施例「インペラ」

Impellers

We observe whether there are any foreign substances that have been caught or any wear due to contact with the side plate or case, and also measure the fitting parts of the shaft. After measuring the dimensions of each part, we examine whether the appropriate clearance can be maintained, and then we can adjust the assembly for optimal performance. Depending on the type of impellers, incorporated gears, and conveyed fluids, we can conduct assembly so as to maximize its potential. If damage due to contact is identified and the impact is judged to be minor, we can perform repairs.

整備・メンテナンス・修理の 実施例「タイミングギア」

Timing gears

Maintaining correct lubricity is important to prevent temperature rise of timing gears. If the gear temperature rises, the backlash and clearance between the gears cannot be properly maintained, causing impellers to collide with each other or to come into contact with the side case or case, resulting in catastrophic damage. By inspecting the gear fitting parts, we understand the condition of wear and conduct appropriate repairs and adjustments to prevent rotors from making contact and secure appropriate clearance.

整備・メンテナンス・修理の 実施例「異物の侵入」

Contamination

Defects caused by foreign substances that have been caught in the blower during operation are also likely to occur frequently. Since there is only a small clearance between the impellers and between the impeller and the casing, catching or accumulation of foreign substances will cause wear of the impeller and the casing. Impeller wear causes imbalance and is observed as vibration, which induces uneven wear in the bearing case and further increases vibration, resulting in a negative cycle. As a result, gear rotation failure and bearing seizure cause clearances and timing differences, and pumping capacity decreases.

整備・メンテナンス・修理の 実施例「クリアランス調整」

Clearance adjustments

Properly maintained clearances ensure efficient pumping of fluid while minimizing fluid leakage through clearances and improving energy efficiency. Clearance adjustment is an important task to measure all the required clearance inside the roots blower, and adjust and set the clearance to the most appropriate clearance in each section. By considering the surrounding operating environment, the fluid to be conveyed, the fluid to be taken in, and the materials contained in the fluid, we set the optimum clearance for the machine to be serviced and make adjustments to maintain the performance.

Record of performance for maintenance and service

  • Dresser
  • TAIKO KIKAI INDUSTRIES
  • ANLET
  • ITO Engineering
  • Unozawa-gumi Iron Works
  • Fuji Alloy Iron Works
  • Overseas-made roots blowers (Italy, Taiwan), etc.

Before & After

Examples of before and after service, repairs and maintenance.

整備のBefore&After01「Before」
Before

The bearing was damaged due to insufficient oil supply, and the case for the outer ring of the bearing was seized. At the same time, the shaft was twisted and greatly reduced in size. The impellers could not rotate due to cracks and locking caused by contact between the impellers.

整備のBefore&After01「After」
After

We fabricated a new bearing case and shaft. After removing the damaged shaft from the impeller, we conducted machining and inserted the fabricated shaft. We repaired the impeller with welding for repairing casting products, and performed maintenance and service so that the impeller was able to be used again.

整備のBefore&After02「Before」
Before

Regular maintenance of roots blowers over 10 tons. We conduct preventive maintenance and TBM in our company to ensure that operations do not stop. We ask the customer about use conditions to determine if there has been any impact on the quality of the product, and perform maintenance while paying attention to the relevant portions in overhauling.

整備のBefore&After02「After」
After

After thoroughly cleaning and washing the interior, we measured the fitting parts and replaced the bearing and oil seal.Judging that the fitting part between the shaft and the bearing outer ring needed repair due to heavy load, we repaired it with the impeller attached at Kurashiki Boring.

整備のBefore&After03「Before」
Before

This is the roots blower that stopped during operation due to bearing vibration because bearing repair was incomplete.Since it had been left outside for a long time, rust had advanced to the inside the casing and the impeller, and it had become stuck and unable to rotate, so we received a consultation for repair.

整備のBefore&After03「Before」
After

We machined the poorly repaired areas and repaired with appropriate tolerances.After removing all internal rust and corrosion with wires, we measured the dimensions of each part and inspected it in detail to see if it was affected by vibration.

整備のBefore&After04「Before」
Before

Large-scale roots blowers are regularly serviced because of their important role.Because it had been in use for a long time and showed abnormal behavior, it was brought in for a disassembly inspection.This is an example where we disassembled each part and found the breakage of the fitting parts and bolts.

整備のBefore&After04「After」
After

The shaft was severely damaged, so it was replaced with a new one. The bearing case, which is the fitting part of the outer, was also worn out, so we repaired and machined it by thermal-spraying.After removing all the broken bolts, we replaced them with new ones as maintenance.

Please feel free to contact us for consultations, estimates, etc.
If there is a need for an immediate response, please contact us by phone.

Inquiries by Phone
+81-(0)86-450-4577
Business Hours
8:30 a.m. to 5:30 p.m. (weekdays)

For consultations, please feel free to contact us.

Fabrication of parts

KBK Engineering makes high-quality parts available based on technical strengths acquired in maintenance and service for various roots blowers.

Due to manufacturer discontinuation of production and organization scale-down, there are a large number of machines without expectations for after-sales service.

We fabricate components as much as possible so that failure of one part does not lead to disposal of the entire machine. With the exception of the impeller, we can fabricate most of the components. Even in the case of the roots blower considered impossible to service, we have a record of fabricating and assembling its components. We determine materials and fitting tolerances for internal parts by ensuring airtightness and considering the properties of the conveyance fluid. We appropriately design and process external parts, taking into account the operating environment and operating conditions.

ルーツブロワの部品製作事例「軸」

Shafts

Due to poor lubrication, the bearing inner ring became hot and the shaft was burned out. We removed the shaft from the impeller, sketched the non-damaged portion, determined fitting dimensions and the shape of the labyrinth, fabricated a new shaft, fit it, and confirmed that an appropriate clearance was secured.

ルーツブロワの部品製作事例「ベアリングケース」

Bearing cases

Due to the heat generated by the outer ring of the bearing, the casting was seized and could not be reused, so a new part was fabricated. We sketched non-damaged parts used in other portions, fabricated the same part, and changed the tolerance and properties of the fitting part to prevent seizure.

ルーツブロワの部品製作事例「プーリー」

Pulleys

We temporarily stopped operation and measured the pulley on-site, and fabricated a new pulley. Based on the shafts protruding from the inner diameter tapered part, including the portion where the belt is hung, we calculated the tapered part, and fabricated, painted, and delivered the pulley.

ルーツブロワの部品製作事例「ラビリンス」

Labyrinths

We can fabricate new labyrinths that have lost their function due to wear of the grooves caused by contact. We can restore the function of even a single labyrinth, as well as an engraved shaft groove, by sketching and properly dimensioned design.

Repairs for parts

We repair components of roots blowers, including shaft fitting parts, bearing cases, side covers, and dynamic balance corrections.
We repair parts by adding excellent wear resistance and corrosion resistance with hard-facing, thermal-spraying, and plating.

Based on the condition that existing parts should be reused, we carefully observe the damage and select more durable fabrication methods and materials to recycle the parts. Not limiting to the parts to be repaired, we also pay attention to the surrounding areas and seemingly unrelated portions, and perform appropriate repairs so that the entire roots blower can be operated efficiently. We offer integrated service from the repairs for each component to the dynamic balance after repair.

ルーツブロワ部品補修事例「軸の補修」

Repairs for shafts

In addition to repairs for bearings, which is usually performed, we conduct machining on the oil seal, in consideration of the surrounding environment, and we can restore the shape by forming. In the labyrinth section, which is often used in a roots blower shaft, we can restore the function by imitating the non-damaged section.

ルーツブロワの部品補修事例「大型ベアリングケース」

Large Bearing Cases

We can repair even large bearing cases unsuitable for lathe machining. We determine the elements necessary to secure an appropriate clearance with the impeller, and restore the performance with surface treatment by thermal-spraying and plating, and with repair by selecting optimal machine tools.

ルーツブロワの部品補修事例「サイドカバーの補修」

Repairs for side covers

We also repair side covers to restore the performance to the targeted pumping capacity, while maintaining the proper clearance. We observe the existing parts in detail, use the repair methods to capture the characteristics of the fluid, and conduct machining so as to obtain the best results.

ルーツブロワの部品補修事例「インペラの補修」

Repairs for the impellers

After observing the damaged condition and examining the damaged part, and if judging that repair is possible, we can try to restore the shape. When repairing impellers made of cast iron or cast steel, we carefully repair them to avoid secondary damage caused by cracking.

Reasons why KBK Engineering is selected for service, repairs and maintenance for Roots Blowers

We offer the very best in service and solutions to problems based on our reliable technical strengths.

KBKエンジアリングが選ばれる理由01「安心してお任せいただける整備の技術」

REASON 01 Maintenance and service technology that you can entrust to us with complete confidence

KBK Engineering was spun off from Kurashiki Boring Kiko as an independent company specializing in maintenance and service for decanter centrifuges. Conventionally, maintenance and service for machines relied on an engineer’s intuition and experience, but nowadays, maintenance and service based on mechanical engineering and material engineering is required. In the maintenance and service industry, handing down of technology and technical strengths is of critical importance, and we, with our core of young engineers, perform maintenance and service for all manufacturers’ decanter centrifuges through maintenance and service supported by our reliable technology.

KBKエンジニアリングが選ばれる理由：技術力を表す画像

REASON 02 Technical Strengths

Older decanter centrifuges that have been used for many years may not have data such as drawings available. KBK Engineering uses its advanced measurement techniques and reverse engineering to fabricate hard-to-procure parts. By setting materials and appropriate dimensional tolerances, and making full use of changes in materials and various surface treatment types and heat treatment, the life-spans of existing parts can be extended. We contribute to future improvement in productivity by making modifications to fit existing parts based on dimensional restoration.

KBKエンジアリングが選ばれる理由03「確かな実績」

REASON 03 Proven Record of Performance

We offer our customers the very best in service and solutions to problems with our reliable technical strengths backed by a long record of performance for maintenance and service and manufacturer-certified. Requests for maintenance and service from many users and manufacturers over many years are the fruits of recognition of our technical strengths certified and authorized as well as advanced expertise.

KBKエンジアリングが選ばれる理由04「厳格な管理」

REASON 04 Stringent Controls

Since July 2009, when we received ISO9001:2008 certification, the international standard for quality management systems, our quality management systems have been reviewed and ISO9001:2015 certified. Our work proceeds based on controlled processes, and the maintenance and service history of each customer is recorded and information including dimensional records and photographs, as well as reports, is carefully preserved for future access. We take on the role of machine manager in support of our customers.

KBKエンジアリングが選ばれる理由05「対応力」

REASON 05 Flexible Response

We provide one-stop response and support from transportation, overhaul and maintenance, fabrication of parts, repairs, dynamic balance corrections, test runs, to delivery. Through our established network, we perform repairs, fabrications and modifications, aiming at realizing delivery schedules in line with customer requirements. For thermal spray repairs, in particular, including before and after machining, we offer an integrated service with our partner company, Kurashiki Boring Kiko, to provide high-quality repairs suitable for every usage condition.

KBKエンジニアリングが選ばれる理由06「人材の育成」

REASON 06 Personnel Training

In maintenance and service of machines, maintenance and service based on mechanical engineering and material engineering is required, and transferring technology and technical strengths is of critical importance. By holding regular study sessions with specialized instructors and experts, our core of young engineers actively absorb knowledge and skills in order to perform maintenance and service backed by our reliable technical strengths and technology.

Please feel free to contact us for consultations, estimates, etc.
If there is a need for an immediate response, please contact us by phone.

Inquiries by Phone
+81-(0)86-450-4577
Business Hours
8:30 a.m. to 5:30 p.m. (weekdays)

For consultations, please feel free to contact us.

Maintenance and Service Flow

We provide high-quality maintenance and service for our customers in accordance with standardized procedures.

Step. 01

整備の流れ：お問い合わせに関する画像

Step. 01 Inquiry

Let us know your machine condition and the details of the problem. Prepare drawings and instruction manuals, if available. In case of an emergency, contact us by phone at +81-(0)86-450-4577

Step. 02

整備の流れ：基本整備見積書提出に関する画像

Step. 02 Submission of an estimate for basic maintenance and service

An estimate for basic maintenance and service will be submitted based on the information provided, discussions, on-site checks, etc.

Step. 03

整備の流れ：搬出(一部機械)に関する画像

Step. 03 Carrying-out (some machines)

Decanter centrifuges, etc., requiring measurements at the time of removal, will be removed on-site and carried out by our staff, as necessary.

Step. 04

整備の流れ：搬入に関する画像

Step. 04 Carrying-in

The removed machine will be carried in to our factory, where a large truck exceeding 10t can enter.

Step. 05

整備の流れ：分解・清掃・検査に関する画像

Step. 05 Disassembly, cleaning and inspection

Disassembly and cleaning are performed according to proper procedures, and each part is measured dimensionally and inspected. A determination is made on the course of repairs and maintenance and service according to the results of an inspection. Various types of non-destructive inspections are also performed as necessary.

Step. 06

整備の流れ：補修見積もり、報告書提出に関する画像

Step. 06 Submission of an estimate for repairs and a report

An inspection report and an estimate for additional repairs will be prepared based on the results of inspections and the course of repairs, maintenance and service are submitted, and the course of repairs, maintenance and service is finalized after consultations with the customer.

Step. 07

整備の流れ：部品補修、部品製作に関する画像

Step. 07 Repairs for parts and fabrication of parts

Repairs for parts and fabrication of parts are performed by planning appropriate processing methods at each subcontract factory. Various types of hard-facing are performed by our skilled engineers.

Step. 08

整備の流れ：動バランス修正に関する画像

Step. 08 Dynamic balance corrections

This process is indispensable to maintenance and service for high-speed rotating machines. Actual running in an unbalanced state will cause a failure, breakage, or an accident.

Step. 09

整備の流れ：組立前検査に関する画像

Step. 09 Inspections before assembly

Repaired and fabricated parts are inspected, and only parts that have been confirmed to meet specifications are used for assembly.

Step. 10

整備の流れ：組立調整に関する画像

Step. 10 Assembly and adjustments

By tightening each part to the proper torque, assembly is performed while adjusting component parts to the minimum. O-rings, oil seals, bearings, and other parts are handled carefully to prevent damage.

Step. 11

整備の流れ：試運転に関する画像

Step. 11 Test runs

After assembly, test runs are performed where possible, and temperature, vibration, and various other data are collected. The results are reflected in a report.

Step. 12

整備の流れ：納品・報告書提出に関する画像

Step. 12 Delivery and submission of a report

After completion of all work, delivery is made to the customer-designated site. Installation of equipment can also be arranged. Based on the submitted report, we can also offer consultations on operation, maintenance and service plans.

FAQs

Frequently asked questions and answers. Please feel free to contact us if you have any questions that have not been posted.

Q1 What are some of the features that KBK Engineering offers?
We provide maintenance and service for high-speed rotating machines, especially for decanter centrifuges. Our group company offers advantages through integrated maintenance and service when it comes to handling all necessary repairs, such as hard-facing and thermal spray.
Q2 What kind of a partner company is Kurashiki Boring Kiko?
Our partner company has a 60-year history and is equipped with machining facilities required for repairs of rotating machines, such as pretreatment, thermal spray, and finishing processing.
Q3 What kind of information is needed to request an estimate?
Please provide us with assembly drawing(s), machine conditions, past repair status, operating conditions, delivery time, etc., to the extent possible.
Q4 What is the difference from manufacturer maintenance and service?
In many instances, when a machine seizes up it is because a component part or parts are damaged. We have the know-how to repair component parts and have an established network for fabrication of component parts, so that short delivery times and low-cost repairs can be guaranteed.
Q5 What if the manufacturer of an older machine is no longer in business?
We can provide maintenance and service even for older machines where drawings are no longer available. New parts can be fabricated from existing parts by reverse engineering and restored to their original state.
Q6 What is your company’s policy concerning customer information and drawings?
We recognize and understand that machines used for operation and raw materials processed are each customer’s confidential information and proprietary assets.
Q7 Can you handle maintenance and service for machines other than Roots Blowers?
We have a record of performance in maintenance and service for various high-speed rotating machines, and we also offer maintenance and service for diverse machines other than Roots Blowers.
For details, see the section for maintenance and service for various rotating machines including examples of maintenance and service.

Inquires

Please feel free to contact us by phone, fax, or web form.

Inquiries by Phone
+81-(0)86-450-4577
Business Hours
8:30 a.m. to 5:30 p.m. (weekdays)

Web form

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