Welcome: KUNAG Fluid Control System (Shanghai) Co., Ltd.
Language: Chinese ∷  English
Search

brand information

Introduction to common faults and solutions for US PARKER cylinders

Parker is the abbreviation of Parker Hannifin, English Parker Hannifi, which is the world's leading manufacturer of diverse motion and control technology and systems, the world's largest provider of transmission control products, and the industry's most comprehensive precision solution. The world's largest professional hydraulic joints, hose assemblies, hard pipe joints EO|EO2 joints, quick joint products, refrigeration and air conditioning parts, pneumatic, automatic control products manufacturers. With BALSTON, DH, RECTUS, TEMA, Alron, Racor, Finite and other well-known brands.
The PARKER cylinder is a cylindrical metal part that guides the piston to reciprocate linearly in the cylinder. The working fluid converts thermal energy into mechanical energy by expansion in the engine cylinder; the gas is compressed by the piston in the compressor cylinder to increase the pressure. A housing such as a turbine or a rotary piston engine is also commonly referred to as a "cylinder." PARKER Parker cylinder applications: printing (tension control), semiconductor (spot welder, chip grinding), automation control, robots, etc.

The problem and reason of PARKER Parker cylinder
1. PARKER Parker cylinders are cast, PARKER Parker cylinders are subject to aging treatment after leaving the factory, so that the internal stress generated by the PARKER Parker cylinder during the casting process is completely eliminated. If the aging time is short, the processed PARKER Pike cylinder will be deformed in the future operation.
2. The situation of the PARKER Parker cylinder during operation is complicated. In addition to the pressure difference between the gas inside and outside the PARKER Pike cylinder and the weight of the various components contained in it, it also bears the reaction of the steam to the stationary part. Force, and the force acting on the cylinder under various hot and cold conditions of the connecting pipe, under the interaction of these forces, the PARKER Parker cylinder is prone to plastic deformation and leakage.
3. The load increase or decrease of the PARKER Pike cylinder is too fast, especially the rapid start, stop and change of working conditions, the temperature change is large, the way of warming the cylinder is not correct, the insulation layer is opened too early during shutdown, etc., in the cylinder and on the flange Produces great thermal stress and thermal deformation.
4. PARKER Parker cylinders generated stress during machining or after repair welding, but did not temper the PARKER Parker cylinder to eliminate, resulting in a large residual stress in the PARKER Parker cylinder, resulting in permanent deformation during operation.
5. During the installation or overhaul process, due to the maintenance process and maintenance technology, the expansion gap of the inner cylinder, cylinder partition, diaphragm sleeve and steam envelope is not suitable, or the expansion gap of the hanger pressure plate is not suitable. After that, a huge expansion force is generated to deform the PARKER Parker cylinder.
6. The PARKER Parker cylinder sealant used is of poor quality, too many impurities or the wrong type; if there are hard impurity particles in the PARKER cylinder sealant, it will make the sealing surface difficult to tightly bond.
7. The strength of the PARKER cylinder cylinder bolt is insufficient or the material of the bolt is unqualified. The tightness of the PARKER Pike cylinder joint surface is mainly achieved by the tightening force of the bolt. The thermal stress and high temperature generated when the unit starts or stops or increases or decreases the load will cause the stress relaxation of the bolt. If the stress is insufficient, the pre-tightening force of the bolt will gradually decrease. If the bolt material of PARKER Parker cylinder is not good, the bolt will be elongated under the action of thermal stress and cylinder expansion force during long-term operation, plastic deformation or fracture will occur, and the tightening force will be insufficient, causing leakage of the cylinder. .
8. The order of the PARKER Parker cylinder bolts is incorrect. Generally, the cylinder bolts are fastened from the middle to the two sides when tightening, that is, from the maximum position of the vertical arc or the place where the force deformation is the greatest, so that the gap at the maximum deformation will be forwarded to the PARKER cylinder. The free end of the transfer, the final gap gradually disappeared. If it is tight from the two sides to the middle, the gap will be concentrated in the middle, and the cylinder joint surface will form a bow-shaped gap, causing steam leakage.

The PARKER Parker cylinder leaks inside and outside. Generally, the piston rod is installed with eccentricity, the lubricating oil supply is insufficient, the sealing ring and the sealing ring are worn or damaged, and the PARKER Parker cylinder has impurities and piston rods with scratches. Therefore, when the cylinder leaks inside and outside, the center of the piston rod should be re-adjusted to ensure the coaxiality between the piston rod and the cylinder; it is necessary to check whether the oil mister is working reliably to ensure that the actuator is well lubricated; When the ring and seal ring appear worn or damaged, they must be replaced in time; if there is impurities in the PARKER Pike cylinder, it should be removed in time; when there is a flaw on the piston rod, it should be replaced.
The PARKER Parker cylinder has insufficient output force and unstable operation. It is generally caused by stuck piston or piston rod, poor lubrication, insufficient air supply, or condensation and impurities in the cylinder. In this regard, the center of the piston rod should be adjusted; check whether the operation of the oil mister is reliable; whether the air supply line is blocked. When there is condensed water and impurities in the PARKER Pike cylinder, it should be removed in time.
The PARKER Parker cylinder has a poor cushioning effect, which is generally caused by wear of the buffer seal or damage to the adjusting screw. In this case, replace the seal and adjustment screw.
The piston rod and cylinder head of the PARKER Pike cylinder are damaged, usually due to the eccentricity of the piston rod installation or the ineffective damping mechanism. In this case, adjust the center position of the piston rod; replace the cushion seal or adjustment screw.

solution
1.PARKER Parker cylinder with large deformation or serious steam leakage joint surface, using the method of grinding the joint surface
If the joint surface of the upper cylinder is deformed within the range of 0.05 mm, the joint surface of the upper cylinder is used as the reference surface, and red Dan or embossed blue paper is applied to the joint surface of the lower cylinder, and the lower cylinder is scraped according to the trace. If the deformation of the joint surface of the upper cylinder is large, apply red Dan in the upper cylinder, and develop the trace with a large flat ruler to level the upper cylinder. Or use the mechanical processing method to level the upper cylinder joint surface, and then use the above cylinder as the reference to scrape the lower cylinder joint surface. There are two ways to grind the PARKER cylinder joint surface:
(1) It is a bolt that does not close the joint surface. The jack is slightly pushed to move forward and backward with the jack, and the scraping is performed according to the coloring condition of the red joint of the lower cylinder joint surface. This method is suitable for a high-pressure cylinder with a strong structural rigidity.
(2) It is a bolt with tight joint surface. According to the tightness of the joint surface of the feeler gauge, the value and the trace of the extrusion are measured, and the joint surface is repaired. This method can eliminate the influence of the vertical arc of the cylinder on the gap.
2. Use appropriate cylinder sealing material
Because there is no uniform national standard and industry standard for steam turbine cylinder sealant, the raw materials and formulas are also different, and the product quality is uneven. When selecting the cylinder sealant of steam turbine, it is necessary to choose a reputation in the industry. Guaranteed regular manufacturers to ensure the tightness of the cylinder after maintenance.
3. Local repair welding method
Since the cylinder joint surface is washed by steam or corrodes the groove mark, the groove is added with a suitable electrode, and the mark is made with a flat plate or a flat ruler, and the weld bead and the joint surface are in the same plane. When the cylinder joint surface is deformed greatly or the steam leakage is serious, one or two 10-20 mm wide dense clearance gap seals are repaired on the joint surface of the lower cylinder, and then measured with a flat ruler or a buckle cylinder, and coated with a red pencil. Until the gap is eliminated. The process of this operation is also very simple, preheat the cylinder to 150 ° C before welding, and then perform partial reflow or jump welding at room temperature. Use austenitic electrodes, such as A407, A412, and use asbestos cloth to cover the insulation and slow cooling after welding. After the room temperature is cooled, the sanding is performed.
4. Coating or spraying of the cylinder joint surface
When the cylinder joint surface leaks in a large area and the gap is about 0.50 mm, in order to reduce the workload of the scraping, a coating process can be used. The cylinder is used as the anode, the coating is used as the cathode, and the electrolytic solution is repeatedly applied on the joint surface of the cylinder. The thickness of the coating depends on the gap of the cylinder joint surface. The type of the coating depends on the material of the cylinder and the shaving. Process depends. Spraying is to use a special high-temperature flame spray gun to heat the metal powder to a molten or plastic state and then spray it onto the treated cylinder surface to form a coating method with the desired properties. The utility model has the advantages that the equipment is simple, the operation is convenient and the coating is firm, and the cylinder temperature after spraying is only 70°C-80°C, the cylinder is not deformed, and the heat-resistant, wear-resistant and corrosion-resistant coating can be obtained. It is noted that the cylinder surface should be ground, degreased and pulled before application and spraying. After the application and spraying, the coating should be ground to ensure the tightness of the joint surface.
5. Combination surface padding method
If the local gap leakage of the bonding surface is not very large, the 80-100 mesh copper mesh may be heat-treated to reduce the hardness, and then cut into an appropriate shape, placed on the leakage surface of the bonding surface, and then equipped with a cylinder sealant. If the gap between the joint faces is large and the leakage is serious, a groove of 50 mm deep and 5 mm wide may be opened in the upper and lower joint faces, and a toothed pad of IGr18Ni9Ti is embedded in the middle, and the thickness of the toothed pad is generally about 0.05-0.08 mm larger than the depth of the groove, and It can be adjusted with stainless steel gasket of the same shape.
6. Method of controlling bolt stress
If the deformation of the cylinder joint surface is small and uniform, replace the new bolt with a gap or increase the preload of the bolt appropriately. Tighten the bolts from the middle to the sides at the same time, that is, from the maximum of the vertical arc or the place where the force is deformed the most. Theoretically, the pre-tightening force of the control bolt can be calculated by the formula d/L≤A, but since the data and measurement methods of this calculation are still under study, it has not been promoted, and it is based on the experience of the maximum allowable stress of the bolt. And set.
7. Polymer material method adopted in the new period
With the further development of technology, polymer composite materials have gradually achieved successful application in cylinder maintenance. Compared with the traditional means, the polymer composite material has excellent temperature resistance, good pressure resistance, better sealing performance, good plastic deformation, heat curing, and the sealing film will not be Destruction, thus ensuring the sealing of the sealing surface of the machine; in addition to easy removal, the used sealing surface can be easily wiped off with absolute ethanol or acetone without adhering to the sealing surface; due to its excellent performance, it gradually becomes more and more More and more cylinder companies are favored.

CONTACT US

Contact: peng gong

Phone: 18918462396

Tel: 021-59718851

Email: kunage@126.com

Add: Lane 819, Qinghewan Road, Qingpu Industrial Park, Qingpu District, Shanghai

Scan the qr codeClose
the qr code