Ultrasonic vibrating valve lapping machine

Abstract

The application discloses an ultrasonic vibration valve grinder, which comprises a servo motor, an ultrasonic vibrator, a main shaft and a grinding disc. The servo motor drives a driving synchronous wheel after being decelerated by a planetary gear reducer, drives a driven synchronous wheel through a synchronous belt to drive the main shaft to produce rotary motion, and the ultrasonic vibrator vibrates at a high frequency. The vibration is transmitted to the main shaft protection cap through the output end protection cap of the ultrasonic vibrator output end and the ultrasonic resonant sheet, so that the main shaft is driven to produce high-frequency vibration. The grinding disc is subjected to the combined motion of rotation and ultrasonic vibration impact to grind the valve seat sealing surface. The ultrasonic vibration valve grinder has the advantages that ultrasonic vibration impact and rotary motion are adopted, all abrasive particles produce an angular strong impact grinding relative to the sealing surface in the combined motion, the grinding efficiency is improved, and the grinding time is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve grinding processing, in particular to an ultrasonic vibration valve grinding machine. BACKGROUND

[0002] In the nuclear power, thermal power and petrochemical industry, a large number of high-temperature and high-pressure valves are used on the pipeline, and the sealing surface of the valve is usually made of hard alloy material. The hard alloy material is difficult to grind and process, which has become a difficult point of maintenance time control. In particular, when the sealing surface is severely scratched, the grinding and removal of the scratch takes a long time. The current valve grinding machine only has a rotary grinding motion. If the grinding pressure is increased, the valve grinding machine may be overloaded and blocked, so it is difficult to improve the grinding efficiency by increasing the pressure. SUMMARY

[0003] The purpose of the present application is to provide an ultrasonic vibration valve grinding machine to solve the problems existing in the prior art, which adopts ultrasonic vibration impact and rotary motion to improve the grinding efficiency and shorten the grinding time.

[0004] To achieve the above-mentioned purpose, the present application provides the following scheme: the present application provides an ultrasonic vibration valve grinding machine, which comprises

[0005] a servo motor, the servo motor arranged in the housing is connected with the main shaft through a transmission mechanism, and the servo motor is used to drive the main shaft to rotate; and

[0006] an ultrasonic vibration sub, the output end of the ultrasonic vibration sub arranged in the housing transmits vibration to the main shaft protection cap located at the top end of the main shaft through an ultrasonic resonant sheet and an output protection cap, so as to drive the main shaft to vibrate; and

[0007] a compressed air pipe, one end of the compressed air pipe is connected with an air source, and the other end is provided with a nozzle, the nozzle is used to cool the servo motor and the ultrasonic vibration sub; and

[0008] a main shaft, the bottom of the housing is connected with a shaft sleeve, the main shaft is arranged in the shaft sleeve, and the outer circular surface of the shaft sleeve is fixedly installed on a machining center or a support; and

[0009] a grinding disc, the grinding disc is rotatably arranged at the end of the main shaft, and the grinding disc is used to grind the sealing surface of the valve.

[0010] Preferably, the servo motor is connected with a control electric box, the output end of the servo motor is provided with a planetary reducer, the transmission mechanism comprises a driving synchronous wheel and a driven synchronous wheel, the output end of the planetary reducer is in transmission connection with the driving synchronous wheel, the driving synchronous wheel drives the driven synchronous wheel through a synchronous belt, and the main shaft is coaxially assembled in the inner hole of the driven synchronous wheel.

[0011] Preferably, the ultrasonic vibrator is connected with an ultrasonic generating electric box; a vibrator mounting seat is arranged in the inner cavity of the shell, and the flange at the bottom of the ultrasonic vibrator is assembled on the vibrator mounting seat; the output protection cap is coaxially arranged with the output shaft of the ultrasonic vibrator; and the inner hole of the ultrasonic resonant sheet is sleeved on the outer circular surface of the main shaft protection cap.

[0012] Preferably, one end of the main shaft protection cap is sleeved on the end of the main shaft, and the upper boss of the main shaft protection cap is coaxial with the ultrasonic resonant sheet and the output protection cap.

[0013] Preferably, a locking nut and a spring are arranged on the main shaft, the locking nut is threadedly connected with the main shaft, the lower part of the locking nut is coincident with a spring compression force adjusting washer, the spring compression force adjusting washer is used for adjusting the axial position of the locking nut relative to the main shaft, and the upper end surface of the spring is in abutment with the spring compression force adjusting washer.

[0014] Preferably, a thrust bearing is arranged at the bottom of the spring, the inner hole of the thrust bearing is coaxial with the main shaft, and the lower end surface of the thrust bearing is coincident with the upper step hole end surface of the shaft sleeve.

[0015] Preferably, two upper and lower sliding bearings are arranged in the shaft sleeve, the main shaft is coaxially connected with the two sliding bearings, and the bottom of the sliding bearing located at the lower side is provided with a hole retainer ring mounted in a ring groove on the inner wall of the shaft sleeve.

[0016] Preferably, a universal joint male head is coaxially connected with the tail end of the main shaft, a universal joint female head is assembled and connected with the universal joint male head, and the grinding disc is mounted at the lower end of the universal joint female head.

[0017] The present application has the following beneficial technical effects relative to the prior art:

[0018] The ultrasonic vibration valve grinder in the present application comprises a servo motor, an ultrasonic vibrator, a main shaft and a grinding disc. The servo motor drives a driving synchronous wheel after being decelerated by a planetary gear reducer, drives a driven synchronous wheel to drive the main shaft to produce rotary motion, and the ultrasonic vibrator vibrates at a high frequency. The vibration is transmitted to the main shaft protection cap through the output end protection cap and the ultrasonic resonant sheet, so as to drive the main shaft to vibrate at a high frequency. The grinding disc is ground under the combined motion of rotation and ultrasonic vibration impact. The ultrasonic vibration valve grinder in the present application adopts ultrasonic vibration impact and rotary motion. In this combined motion, all abrasive particles produce an angular strong impact grinding relative to the sealing surface, so as to improve the grinding efficiency and shorten the grinding time. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed in the embodiments will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only represent some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings belong to the protection scope of the present application.

[0020] Figure 1 It is a whole schematic view of the appearance of the ultrasonic vibration valve grinder in the embodiments of the present application.

[0021] Figure 2 It is a side view of the ultrasonic vibration valve grinder in the embodiments of the present application. Figure 1

[0022] It is a sectional view of A-A in the ultrasonic vibration valve grinder in the embodiments of the present application. Figure 3 Figure 2 It is a sectional view of C-C in the ultrasonic vibration valve grinder in the embodiments of the present application.

[0023] Figure 4 Figure 2 It is a sectional view of C-C in the ultrasonic vibration valve grinder in the embodiments of the present application.

[0024] In the drawings: 1, servo motor; 11, planetary reducer; 111, reducer seat; 12, driven synchronous wheel; 13, synchronous belt; 14, driving synchronous wheel; 2, ultrasonic vibrator; 21, output end protection cap; 22, ultrasonic resonant piece; 23, vibrator mounting seat; 24, vibrator flange; 3, compressed air pipe; 31, nozzle; 4, main shaft; 41, main shaft protection cap; 42, locking nut; 43, spring compression force adjusting washer; 44, spring; 45, thrust bearing; 46, sliding bearing I; 47, sliding bearing II; 48, hole check ring; 5, grinding disc; 51, universal joint male head; 52, universal joint female head; 6, shaft sleeve; 7, shell; 8, handle; A, motor socket; B, encoder socket; C, ultrasonic power supply; D, compressed air quick connector. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative effort based on these drawings belong to the protection scope of the present application.

[0026] The purpose of the present application is to provide an ultrasonic vibration valve grinder to solve the problems in the prior art, and to improve the grinding efficiency and shorten the grinding time by adopting ultrasonic vibration impact and rotary motion combination.

[0027] ​​In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0028] As shown in Figures 1-4 the present application provides an ultrasonic vibration valve grinding machine, comprising

[0029] The servo motor 1 is arranged in the housing 7, and the servo motor 1 is connected with the main shaft 4 through a transmission mechanism. The servo motor 1 is used to drive the main shaft 4 to rotate. A handle 8 is arranged on the housing.

[0030] The ultrasonic vibrator 2 is arranged in the housing 7. The output end of the ultrasonic vibrator 2 transmits vibration to the main shaft protection cap 41 located at the top end of the main shaft 4 through the ultrasonic resonant sheet 22 and the output protection cap, so as to drive the main shaft 4 to vibrate.

[0031] The compressed air pipe 3 is connected with an air source at one end, and a nozzle 31 is arranged at the other end. The nozzle 31 is used to cool the servo motor 1 and the ultrasonic vibrator 2.

[0032] The main shaft 4 is arranged in the shaft sleeve 6 connected with the bottom of the housing 7. The outer circular surface of the shaft sleeve 6 is fixedly installed on a machining center or a support.

[0033] The grinding disc 5 is rotatably arranged at the end of the main shaft 4. The grinding disc 5 is used to grind the sealing surface of the valve.

[0034] In one embodiment, the servo motor 1 is connected with a control electric box. The output end of the servo motor 1 is provided with a planetary reducer 11. The planetary reducer 11 is fixed on the housing 7 through a reducer seat 111. The transmission mechanism comprises a driving synchronous wheel 14 and a driven synchronous wheel 12. The output end of the planetary reducer 11 is in transmission connection with the driving synchronous wheel 14. The driving synchronous wheel 14 drives the driven synchronous wheel 12 through a synchronous belt 13. The main shaft 4 is coaxially assembled in the inner hole of the driven synchronous wheel 12. The servo motor 1 is fixedly connected with the housing 7 of the planetary reducer 11. The output shaft of the servo motor 1 is connected with the input hole of the planetary reducer 11. The driving synchronous wheel 14 is coaxially fixedly connected with the output shaft of the planetary reducer 11. The synchronous belt 13 drives the driving synchronous wheel 14 and the driven synchronous wheel 12. The inner hole of the driven synchronous wheel 12 is coaxial with the main shaft 4. The driven synchronous wheel 12 is fixedly connected with the main shaft 4 in the axial and circumferential directions. The motor socket A at the top of the housing 7 is connected with the control electric box. After the motor socket A is powered on, the servo motor 1 rotates. After the servo motor 1 is decelerated through the planetary reducer 11, the driving synchronous wheel 14 drives the driven synchronous wheel 12 to drive the main shaft 4 to produce rotary motion through the synchronous belt 13.

[0035] In one of the embodiments, the ultrasonic vibrator 2 is connected with the ultrasonic generating electric box; the inner cavity of the shell 7 is provided with a vibrator mounting seat 23, the vibrator flange 24 is fixedly installed on the vibrator mounting seat 23, the output end protective cover cap 21 is coaxial with the output shaft of the ultrasonic vibrator 2, the inner hole bottom end of the output end protective cover cap 21 is coincident with the output shaft end of the ultrasonic vibrator 2, the inner hole of the ultrasonic resonant piece 22 is sleeved on the outer circular surface of the main shaft protective cover cap 41, and the upper and lower end faces of the ultrasonic resonant piece 22 are coincident with the output end protective cover cap 21 and the main shaft protective cover cap 41.

[0036] In one of the embodiments, one end of the main shaft protective cover cap 41 is sleeved on the end of the main shaft 4, and the upper boss of the main shaft protective cover cap 41 is coaxial with the ultrasonic resonant piece 22 and the output protective cover cap.

[0037] In one of the embodiments, the main shaft 4 is provided with a locking nut 42 and a spring 44, the locking nut 42 is threadedly connected with the main shaft 4, the lower part of the locking nut 42 is coincident with a spring compression force adjusting washer 43, the spring compression force adjusting washer 43 is used for adjusting the axial position of the locking nut 42 relative to the main shaft 4, and the upper end face of the spring 44 is in abutment with the spring compression force adjusting washer 43. By adjusting the axial position of the locking nut 42 relative to the main shaft 4, the compression force of the spring 44 can be finely adjusted, and by changing the height of the spring compression force adjusting washer 43, the compression force of the spring 44 can be initially adjusted. The upper part of the spring compression force adjusting washer 43 is coincident with the lower end face of the locking nut 42, and the lower part of the spring compression force adjusting washer 43 is coincident with the upper end face of the spring 44.

[0038] In one of the embodiments, the bottom of the spring 44 is provided with a thrust bearing 45, the inner hole of the thrust bearing 45 is coaxial with the main shaft 4, and the lower end face of the thrust bearing 45 is coincident with the upper step hole end face of the shaft sleeve 6. The lower end face of the spring 44 is coincident with the thrust bearing 45, and springs 44 of different constants (load strength) are adopted to adapt to the resonant frequency of the ultrasonic vibrator 2.

[0039] In one of the embodiments, the shaft sleeve 6 is internally provided with two upper and lower sliding bearings, the two sliding bearings are sliding bearing one 46 and sliding bearing two 47 respectively, the main shaft 4 is coaxially connected with the two sliding bearings and can move in the circumferential direction and the axial direction; the bottom of the lower sliding bearing two 47 is provided with a hole stop ring 48, the hole stop ring 48 is installed in the ring groove on the inner wall of the shaft sleeve 6 and limits the axial movement of the shaft sleeve 6. The sliding bearing one 46 is coaxially installed in the shaft sleeve 6, the lower end of the sliding bearing one 46 is coincident with the step face of the shaft sleeve 6, and thus the axial movement relative to the shaft sleeve 6 is limited; the outer circular face of the shaft sleeve 6 is fixedly installed on the machining center or a support custom-made on site. The sliding bearing two 47 is coaxially installed in the shaft sleeve 6, the upper end is coincident with the step face of the shaft sleeve 6, the lower end is coincident with the hole stop ring 48, and the axial movement relative to the shaft sleeve 6 is limited.

[0040] In one embodiment, the end of the main shaft 4 is coaxially connected with a universal joint male head 51, a universal joint female head 52 is assembled and connected with the universal joint male head 51, and the grinding disc 5 is installed at the lower end of the universal joint female head 52. The grinding disc 5 coincides with the axis of the universal joint female head 52, and the grinding disc 5 can be a smooth sandpaper, a CBN grinding wheel, or a diamond abrasive grinding paste.

[0041] In one embodiment, the power of the servo motor 1 is 1.5 kW, the power of the ultrasonic vibrator 2 is 2 kW, the frequency of the ultrasonic vibrator 2 is 2 kHz, the amplitude of the ultrasonic vibrator 2 is 20 microns, and the rotation speed of the main shaft 4 is 0-200 RPM with stepless speed regulation.

[0042] The working process of the ultrasonic vibration valve grinder is as follows:

[0043] 1. Fix the shaft sleeve 6 of the grinder on the machining center or the special support.

[0044] 2. Adjust the axis of the grinder to coincide with the axial direction of the valve seat.

[0045] 3. Connect the servo motor 1 to the control electric box.

[0046] 4. Turn on the ultrasonic power supply C, and connect the ultrasonic vibrator 2 to the ultrasonic generator electric box.

[0047] 5. Connect the compressed air pipe 3 to the air source to cool the servo motor 1 and the ultrasonic vibrator 2.

[0048] 6. Start the servo motor 1, start the ultrasonic vibrator 2, and turn on the compressed air pipe 3.

[0049] 7. After the servo motor 1 is reduced in speed by the planetary reducer 11, it drives the driving synchronous wheel 14, which drives the driven synchronous wheel 12 through the synchronous belt 13, and drives the main shaft 4 to produce rotary motion.

[0050] 8. The ultrasonic vibrator 2 vibrates at high frequency, and the output end of the ultrasonic vibrator 2 is connected to the main shaft protection cap 41 through the output end protection cap 21 and the ultrasonic resonant piece 22, so as to drive the main shaft 4 to vibrate at high frequency. The spring 44 ensures that the output end protection cap 21, the ultrasonic resonant piece 22, and the main shaft protection cap 41 are tightly attached without being separated.

[0051] 9. After the above-mentioned 7 and 8 movements are combined, the main shaft 4 forms a load movement of rotation and vibration.

[0052] 10. Move the grinding disc 5 of the grinder towards the valve seat sealing surface by operating the machining center or the special support, and observe the power table of the ultrasonic generator electric box after the two are in contact. Stop feeding when the preset power is reached.

[0053] 11. After grinding is completed, the machining center or special support moves the grinder so that the grinding disc 5 is away from the sealing surface.

[0054] 12. Check the grinding effect of the sealing surface, replace the adhesive-backed metallographic sandpaper with smaller particle size, or the metallographic grinding paste with smaller particle size, or the CBN grinding wheel with smaller particle size.

[0055] 13. Repeat steps 6-11 until the roughness of the sealing surface meets the requirements.

[0056] It should be noted that for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0057] In the present application, specific examples are applied to illustrate the principles and implementation modes of the present application, the above embodiment descriptions are only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in specific implementation modes and application scope. In conclusion, the content of the present description should not be understood as a limitation of the present application.

Claims

1. An ultrasonic vibration valve grinding machine, characterized in that: include A servo motor, housed within a housing, is connected to the spindle via a transmission mechanism; the servo motor drives the spindle to rotate. An ultrasonic vibrator, disposed within the housing, transmits vibrations from its output end via an output protective cap to a spindle protective cap located at the top of the spindle, through an ultrasonic resonator, thereby driving the spindle to vibrate; and A compressed air pipe, one end of which is connected to an air source, and the other end of which is provided with a nozzle, the nozzle being used to cool the servo motor and the ultrasonic vibrator; as well as The spindle has a bushing connected to the bottom of the housing, and the spindle is disposed inside the bushing. The outer circular surface of the bushing is fixedly mounted on a machining center or bracket. as well as The grinding disc is rotatably mounted at the end of the main shaft and is used to grind the valve sealing surface. The ultrasonic vibrator is connected to the ultrasonic generator box; a vibrator mounting base is provided in the inner cavity of the housing, and the flange at the bottom of the ultrasonic vibrator is assembled on the vibrator mounting base; the output protective cap is coaxially arranged with the output shaft of the ultrasonic vibrator; the inner hole of the ultrasonic resonator is sleeved on the outer circular surface of the spindle protective cap; one end of the spindle protective cap is sleeved on the end of the spindle, and the upper boss of the spindle protective cap is coaxial with the ultrasonic resonator and the output protective cap; the power of the ultrasonic vibrator is 2 kilowatts; a universal joint male head is coaxially connected to the end of the spindle, and a universal joint female head is assembled and connected to the universal joint male head; the grinding disc is installed at the lower end of the universal joint female head.

2. The ultrasonic vibration valve grinding machine according to claim 1, characterized in that: The servo motor is connected to the control box, and a planetary reducer is provided at the output end of the servo motor; the transmission mechanism includes a driving synchronous pulley and a driven synchronous pulley, the output end of the planetary reducer is connected to the driving synchronous pulley, the driving synchronous pulley drives the driven synchronous pulley through a synchronous belt, and the main shaft is coaxially mounted in the inner hole of the driven synchronous pulley.

3. The ultrasonic vibration valve grinding machine according to claim 1, characterized in that: The main shaft is equipped with a locking nut and a spring. The locking nut is threadedly connected to the main shaft. The lower part of the locking nut coincides with the spring compression force adjusting washer. The spring compression force adjusting washer is used to adjust the axial position of the locking nut relative to the main shaft. The upper end face of the spring abuts against the spring compression force adjusting washer.

4. The ultrasonic vibration valve grinding machine according to claim 3, characterized in that: The bottom of the spring is provided with a thrust bearing, the inner hole of the thrust bearing is coaxial with the main shaft, and the lower end face of the thrust bearing coincides with the upper stepped hole end face of the bushing.

5. The ultrasonic vibration valve grinding machine according to claim 1, characterized in that: The bushing is provided with two sliding bearings, one above the other, and the main shaft is coaxially connected to the two sliding bearings; a retaining ring for the hole is provided at the bottom of the lower sliding bearing, and the retaining ring for the hole is installed in the annular groove on the inner wall of the bushing.

Images