A diesel engine valve and valve seat matching surface grinding device

Abstract

The present invention relates to the technical field of grinding equipment, and discloses a grinding device for the mating surface of a diesel engine air valve and a valve seat, comprising a workbench, a bottom plate is provided at the bottom end of the workbench, a motor is fixedly installed at the top of the bottom plate, a telescopic support rod is fixedly installed at the bottom surface of the workbench, a lifting plate is fixedly installed at the bottom end of the telescopic support rod, an extension shaft is provided at the top of the lifting plate, and a cam is fixedly sleeved at the output end of the motor. The present invention drives the worm to rotate when the motor rotates, and drives the driving wheel to rotate through the transmission of the worm and the worm wheel, thereby achieving the driving wheel driving the air valve to rotate while retaining the original up and down movement of the air valve, ensuring that the mating surface of the air valve can be fully adapted to the mating surface of the valve seat, ensuring uniform grinding all around, and achieving that during subsequent assembly, no matter what angle the air valve is rotated, the sealing of the two can be guaranteed, thereby improving the grinding accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding equipment, and more specifically, to a grinding device for the matching surface of a diesel engine air valve and a valve seat. Background Art

[0002] When overhauling large diesel engines, the valve seat is repaired by manual grinding and machining, depending on the form and severity of the damage. In order to ensure the sealing of the valve and the valve seat, the mating surface of the valve and the valve seat must be ground. In the prior art, the valve is usually inserted into the valve seat, and then the valve is driven up and down by a driving device. The mating working surface is ground by the contact between the valve and the valve seat when the valve falls. However, in actual use, since the valve and the valve seat are installed separately and the valve only moves up and down, the valve and the valve seat need to be reassembled after the grinding is completed. During assembly, the valve and the valve seat may deflect relative to the grinding state. At this time, the actual use mating surface of the valve and the valve seat may deflect from the mating surface in the grinding state, and then leakage may occur due to the inconsistent grinding state of the valve and the valve seat in the circumferential state, which reduces the grinding accuracy. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a diesel engine valve and valve seat matching surface grinding device, which has the advantage of improving grinding accuracy.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a diesel engine valve and valve seat matching surface grinding device, comprising a workbench, a bottom plate is provided at the bottom end of the workbench, a motor is fixedly installed at the top of the bottom plate, a telescopic support rod is fixedly installed on the bottom surface of the workbench, a lifting plate is fixedly installed at the bottom end of the telescopic support rod, an extension shaft is provided at the top of the lifting plate, and a cam is fixedly sleeved at the output end of the motor;

[0005] The bottom end of the workbench is slidably connected with a transverse plate, one end of the transverse plate close to the center of the workbench is slidably connected with a longitudinal frame, a return spring is fixedly installed on the top of the longitudinal frame, a worm and a worm wheel are rotatably connected in the middle of the longitudinal frame, and a driving wheel is fixedly installed on the top of the worm wheel;

[0006] The output ends of the motor and the worm are fixedly sleeved with a transmission wheel, the surface of the transmission wheel is transmission-connected with a transmission belt, a support frame is fixedly installed on the top of the base plate, the top of the support frame is rotatably connected to the support wheel, a tensioning spring assembly is fixedly installed on one end of the support frame away from the center of the workbench, a moving frame is fixedly installed on the other end of the tensioning spring assembly, and the middle part of the moving frame is rotatably connected to the tensioning wheel.

[0007] As a preferred technical solution of the present invention, a fixed tube is fixedly installed on the bottom end of the workbench, the inner cavity of the fixed tube is movably connected with a lifting shaft, the top of the lifting shaft is fixedly installed with a placing plate, the bottom end of the fixed tube is fixedly installed with a connecting tube, the bottom end of the workbench is fixedly installed with a transverse tube, the inner cavity of the transverse tube is slidably connected with a movable shaft 1, and the movable shaft 1 is connected to the transverse plate.

[0008] As a preferred technical solution of the present invention, a connecting ring is fixedly installed on the top of the workbench, a shunt pipe is fixedly installed on the top of the connecting pipe, an extension pipe is fixedly installed on the inner wall of the connecting ring, the inner cavity of the extension pipe is slidably connected with a movable shaft 2, a slide rail is fixedly installed on the top surface of the workbench, the inner cavity of the slide rail is slidably connected with a slider, and a clamping block is fixedly installed on the top of the slider.

[0009] As a preferred technical solution of the present invention, the workbench and the placement plate are both provided with insertion holes in the middle, there are two telescopic support rods, which are respectively located on the front and rear sides of the insertion hole, and there are two driving wheels, which are respectively located on the left and right sides of the insertion hole.

[0010] As a preferred technical solution of the present invention, the lifting plate and the extension shaft are detachably connected by threads, the axis of the extension shaft and the axis of the insertion hole are in the same straight line, and the top end of the extension shaft is located below the driving wheel.

[0011] As a preferred technical solution of the present invention, the reset spring is composed of a spring and a telescopic rod sleeved in the spring, and the top end of the reset spring is fixedly connected to the transverse plate.

[0012] As a preferred technical solution of the present invention, the worm is meshed with the worm wheel, and the diameter of the driving wheel is greater than the diameter of the worm wheel.

[0013] As a preferred technical solution of the present invention, both the supporting wheel and the tensioning wheel are in contact with the transmission belt.

[0014] As a preferred technical solution of the present invention, the connecting ring is connected to the diversion pipe, the connecting ring is connected to the extension pipe, the bottom end of the movable shaft 2 is fixedly connected to the slider, the clamping block is located above the placement plate, there are three clamping blocks in total, and the three clamping blocks are distributed at equal angles on the outside of the placement plate.

[0015] As a preferred technical solution of the present invention, a placement groove is provided at the top of the workbench, and the diameter of the placement groove is equal to the diameter of the placement plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention arranges two driving wheels under the workbench, arranges transmission wheels on the worm and the motor, and connects them with a transmission belt, so that the worm can be driven to rotate when the motor rotates, and then the driving wheel is driven to rotate by the transmission of the worm and the worm wheel, so that the driving wheel drives the air valve to rotate while retaining the original up and down movement of the air valve, and can ensure that the mating surface of the air valve can be fully adapted to the mating surface of the valve seat, and the grinding on all sides can be guaranteed. In the subsequent assembly, no matter what angle the air valve is rotated, the sealing of the two can be guaranteed, thereby improving the grinding accuracy.

[0018] 2. The present invention arranges a connecting ring on the workbench to connect with the diverter pipe. When the placement plate moves downward due to the weight of the valve seat, the liquid in the fixed pipe can be automatically pushed to flow into the connecting ring, and then enters the extension pipe to push the movable shaft 2 and the clamping block to move toward the valve seat, thereby realizing automatic clamping and centering of the valve seat. The operation is simple and convenient. The operator only needs to put the air valve into the valve seat and then fix the valve seat directly on the placement plate.

[0019] 3. The present invention provides a clamping block that can move with the downward movement of the fixed pipe, and when the liquid in the fixed pipe flows, the connecting pipe pushes the movable shaft and the transverse plate, thereby driving the longitudinal frame and the driving wheel to move horizontally. When facing air valves and valve seats of different sizes and specifications, the driving wheel can clamp the air valve, thereby realizing the grinding of the mating surfaces of air valves and valve seats of different sizes and specifications, thereby increasing the scope of use of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the connection pipe connection of the structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the connection ring connection of the structure of the present invention;

[0023] Figure 4 For the present invention Figure 3 The enlarged schematic diagram at A in the middle;

[0024] Figure 5 This is a schematic diagram of the cam connection structure of the present invention;

[0025] Figure 6 For the present invention Figure 5 The enlarged schematic diagram of point B in the middle;

[0026] Figure 7 It is a cross-sectional schematic diagram of the structural workbench of the present invention;

[0027] Figure 8 This is a schematic diagram of the worm connection structure of the present invention;

[0028] Fig. 9 It is a schematic diagram of the cross-sectional explosion of the gas valve and valve seat of the present invention.

[0029] In the figure: 1. workbench; 2. base plate; 3. motor; 4. telescopic support rod; 5. lifting plate; 6. extension shaft; 7. cam; 8. fixed tube; 9. lifting shaft; 10. placement plate; 11. connecting tube; 12. transverse tube; 13. moving shaft one; 14. transverse plate; 15. longitudinal frame; 16. reset spring; 17. worm; 18. worm gear; 19. driving wheel; 20. transmission wheel; 21. transmission belt; 22. support frame; 23. support wheel; 24. moving frame; 25. tensioning wheel; 26. tensioning spring assembly; 27. connecting ring; 28. shunt pipe; 29. ​​slide rail; 30. slider; 31. clamping block; 32. extension pipe; 33. moving shaft two. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figures 1 to 9 As shown, the present invention provides a diesel engine valve and valve seat matching surface grinding device, comprising a workbench 1, a bottom plate 2 is provided at the bottom end of the workbench 1, a motor 3 is fixedly installed at the top of the bottom plate 2, a telescopic support rod 4 is fixedly installed on the bottom surface of the workbench 1, a lifting plate 5 is fixedly installed at the bottom end of the telescopic support rod 4, an extension shaft 6 is provided at the top of the lifting plate 5, and a cam 7 is fixedly sleeved at the output end of the motor 3;

[0032] The bottom end of the workbench 1 is slidably connected with a transverse plate 14, and one end of the transverse plate 14 close to the center of the workbench 1 is slidably connected with a longitudinal frame 15, and a return spring 16 is fixedly installed on the top of the longitudinal frame 15. The middle part of the longitudinal frame 15 is rotatably connected with a worm 17 and a worm wheel 18, and a driving wheel 19 is fixedly installed on the top of the worm wheel 18;

[0033] The output ends of the motor 3 and the worm 17 are both fixedly sleeved with a transmission wheel 20, the surface of the transmission wheel 20 is transmission-connected with a transmission belt 21, a support frame 22 is fixedly installed on the top of the bottom plate 2, the top of the support frame 22 is rotatably connected with a support wheel 23, a tensioning spring assembly 26 is fixedly installed on one end of the support frame 22 away from the center of the workbench 1, a moving frame 24 is fixedly installed on the other end of the tensioning spring assembly 26, and a tensioning wheel 25 is rotatably connected to the middle of the moving frame 24;

[0034] When the cam 7 is driven by the motor 3 to rotate, the protrusions on its surface periodically contact the lifting plate 5, driving the air valve to move up and down. The rotation of the transmission wheel 20 can drive the transmission belt 21 to rotate, and then drive the worm 17 to rotate. The meshing of the worm 17 and the worm wheel 18 can drive the worm wheel 18 and the driving wheel 19 to rotate. The contact between the driving wheel 19 and the air valve can drive the air valve to rotate during the up and down movement. By continuously performing this operation, the grinding of the matching surface of the air valve and the valve seat can be achieved.

[0035] By arranging two driving wheels 19 under the workbench 1, by arranging a transmission wheel 20 on the worm 17 and the motor 3, and connecting them with a transmission belt 21, it is possible to drive the worm 17 to rotate when the motor 3 rotates, and then drive the driving wheel 19 to rotate through the transmission of the worm 17 and the worm wheel 18, so that the driving wheel 19 drives the air valve to rotate while retaining the original up and down movement of the air valve, which can ensure that the mating surface of the air valve can be fully adapted to the mating surface of the valve seat, and ensure that the grinding on all sides is uniform, so that during the subsequent assembly, no matter what angle the air valve is rotated, the sealing of the two can be guaranteed, thereby improving the grinding accuracy.

[0036] Among them, a connecting ring 27 is fixedly installed on the top of the workbench 1, a shunt pipe 28 is fixedly installed on the top of the connecting pipe 11, an extension pipe 32 is fixedly installed on the inner wall of the connecting ring 27, and a moving shaft 2 33 is slidably connected to the inner cavity of the extension pipe 32, a slide rail 29 is fixedly installed on the top surface of the workbench 1, a slider 30 is slidably connected to the inner cavity of the slide rail 29, and a clamping block 31 is fixedly installed on the top of the slider 30;

[0037] Under the weight of the valve seat and the air valve, the placement plate 10 can be pressed down, so that the lifting shaft 9 moves downward in the fixed tube 8, and the liquid in the fixed tube 8 is pushed into the connecting tube 11 and the shunt tube 28. The liquid in the shunt tube 28 enters the extension tube 32 through the connecting ring 27, and then the second moving shaft 33 is pushed out, so that the clamping block 31 moves toward the air valve. The three clamping blocks 31 move at the same time. When the clamping block 31 contacts the air valve, the clamping block 31 fixes the air valve.

[0038] By arranging a connecting ring 27 on the workbench 1 to connect with the diverter pipe 28, it can be achieved that when the placement plate 10 moves downward due to the weight of the valve seat, the liquid inside the fixed tube 8 can be automatically pushed to flow into the connecting ring 27, and then enter the extension tube 32 to push the movable shaft 2 33 and the clamping block 31 to move toward the valve seat, thereby realizing automatic clamping and centering of the valve seat. The operation is simple and convenient. The operator only needs to put the air valve into the valve seat and then fix the valve seat directly on the placement plate 10.

[0039] Among them, a fixed tube 8 is fixedly installed at the bottom end of the workbench 1, and the inner cavity of the fixed tube 8 is movably connected with a lifting shaft 9, and a placement plate 10 is fixedly installed on the top of the lifting shaft 9. A connecting tube 11 is fixedly installed at the bottom end of the fixed tube 8. A transverse tube 12 is fixedly installed at the bottom end of the workbench 1, and a moving shaft 13 is slidably connected to the inner cavity of the transverse tube 12. The moving shaft 13 is connected to the transverse plate 14;

[0040] By providing a clamping block 31 that can move with the downward movement of the fixed tube 8, and by pushing the movable shaft 13 and the transverse plate 14 through the connecting tube 11 when the liquid in the fixed tube 8 flows, it is possible to drive the longitudinal frame 15 and the driving wheel 19 to move horizontally. When facing air valves and valve seats of different sizes, the driving wheel 19 can be guaranteed to clamp the air valve, thereby achieving grinding of the mating surfaces of air valves and valve seats of different sizes, thereby increasing the scope of use of the device.

[0041] The workbench 1 and the placement plate 10 are provided with insertion holes in the middle, there are two telescopic support rods 4, which are respectively located at the front and rear sides of the insertion hole, and there are two driving wheels 19, which are respectively located at the left and right sides of the insertion hole;

[0042] By setting the driving wheels 19 on both sides of the insertion hole, the clamping of the air valve is achieved, and by setting the telescopic support rod 4 on the front and back sides, interference with the driving wheel 19 is avoided, and at the same time, the contraction and extension of the telescopic support rod 4 are used to position the lifting plate 5 and the workbench 1.

[0043] The lifting plate 5 and the extension shaft 6 are detachably connected by threads, the axis of the extension shaft 6 and the axis of the insertion hole are in the same straight line, and the top end of the extension shaft 6 is located below the driving wheel 19;

[0044] When processing and grinding air valves and valve seats of different sizes, the extension shaft 6 is unscrewed from the lifting plate 5, and then the extension shafts 6 of different lengths are installed on the lifting plate 5, so that when the bottom end of the air valve contacts the extension shaft 6, the matching surfaces of the air valve and the valve seat can fit together, thereby improving the use range of the device.

[0045] The return spring 16 is composed of a spring and a telescopic rod sleeved in the spring, and the top of the return spring 16 is fixedly connected to the transverse plate 14;

[0046] By setting a return spring 16, the spring of the return spring 16 can be compressed by reducing the distance between the longitudinal frame 15 and the return spring 16 when the air valve moves upward. After the protrusion of the cam 7 is separated from the lifting plate 5, the pressure of the return spring 16 is used to push the longitudinal frame 15 downward, and then the air valve is driven to move downward and reset through the driving wheel 19.

[0047] The worm 17 is meshed with the worm wheel 18, and the diameter of the driving wheel 19 is greater than the diameter of the worm wheel 18;

[0048] When the worm 17 rotates, it can drive the worm wheel 18 to rotate by meshing with the worm wheel 18. Since the worm wheel 18 and the driving wheel 19 are coaxial, the driving wheel 19 can be driven to rotate. Setting the diameter of the worm wheel 18 to be smaller than the diameter of the driving wheel 19 can prevent the worm wheel 18 from contacting the air valve and causing damage to the air valve.

[0049] Among them, the support wheel 23 and the tension wheel 25 are both in contact with the transmission belt 21;

[0050] The bottom end of the air valve is clamped by two driving wheels 19, and at this time the bottom end of the air valve is in contact with the extension shaft 6. During the lateral movement of the driving wheel 19, the elasticity of the tensioning spring assembly 26 can ensure that the tensioning wheel 25 is always in contact with the transmission belt 21, thereby tensioning the transmission belt 21 and preventing the transmission belt 21 from falling off.

[0051] The connecting ring 27 is connected to the shunt pipe 28, the connecting ring 27 is connected to the extension pipe 32, the bottom end of the movable shaft 2 33 is fixedly connected to the slider 30, the clamping block 31 is located above the placement plate 10, there are three clamping blocks 31, and the three clamping blocks 31 are distributed at equal angles on the outside of the placement plate 10;

[0052] The three clamping blocks 31 distributed at equal angles on the outside of the placement plate 10 can achieve the clamping, fixing and centering of the gas valve using the minimum number of clamping blocks, and the extension tube 32 is connected through the connecting ring 27 to ensure that the extension lengths of the three movable shafts 33 are consistent.

[0053] Among them, a placement groove is opened at the top of the workbench 1, and the diameter value of the placement groove is equal to the diameter value of the placement plate 10;

[0054] By providing the placement groove, the placement plate 10 can be stored. When the placed gas valve is heavy, the placement groove can be used to support the placement plate 10 to avoid the placement plate 10 being damaged by excessive pressure.

[0055] The working principle and use process of the present invention:

[0056] When in use, first insert the gas valve into the valve seat, place the valve seat on the placement plate 10, and ensure that its mating surface faces upward;

[0057] Under the weight of the valve seat and the air valve, the placement plate 10 can be pressed down, so that the lifting shaft 9 moves downward in the fixed tube 8, and the liquid in the fixed tube 8 is pushed into the connecting tube 11 and the shunt tube 28. The liquid in the shunt tube 28 enters the extension tube 32 through the connecting ring 27, and then the second moving shaft 33 is pushed out, so that the clamping block 31 moves toward the air valve. The three clamping blocks 31 move at the same time. When the clamping block 31 contacts the air valve, the clamping block 31 fixes the air valve.

[0058] Then the liquid enters the connecting pipe 11 and pushes the moving shaft 13 to move toward the insertion hole, thereby pushing the transverse plate 14 and the driving wheel 19 toward the insertion hole, thereby making the driving wheel 19 contact with the air valve, and clamping the bottom end of the air valve by the two driving wheels 19. At this time, the bottom end of the air valve is in contact with the extension shaft 6. During the transverse movement of the driving wheel 19, the elasticity of the tensioning spring assembly 26 can make the tensioning wheel 25 always contact with the transmission belt 21, tension the transmission belt 21, and prevent the transmission belt 21 from falling off;

[0059] Start the motor 3, which drives the cam 7 and the transmission wheel 20 to rotate simultaneously. When the cam 7 rotates, the protrusions on its surface periodically contact the lifting plate 5, driving the air valve to move up and down. When the air valve moves up and down, the sliding between the longitudinal frame 15 and the transverse plate 14 can be used to realize that the two driving wheels 19 follow the air valve to move up and down. The rotation of the transmission wheel 20 can drive the transmission belt 21 to rotate, and then drive the worm 17 to rotate. The meshing of the worm 17 and the worm wheel 18 can drive the worm wheel 18 and the driving wheel 19 to rotate. The contact between the driving wheel 19 and the air valve can drive the air valve to rotate during the up and down movement. By continuously performing this operation, the air valve can be completely ground and adapted to the valve seat.

[0060] When processing and grinding valves and valve seats of different sizes, the extension shaft 6 is unscrewed from the lifting plate 5, and then the extension shafts 6 of different lengths are installed on the lifting plate 5, so that when the bottom end of the valve contacts the extension shaft 6, the mating surfaces of the valve and the valve seat can fit together.

[0061] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A diesel engine valve and valve seat mating surface grinding device, comprising a workbench (1), characterized in that: The bottom end of the workbench (1) is provided with a bottom plate (2), the top end of the bottom plate (2) is fixedly mounted with a motor (3), the bottom surface of the workbench (1) is fixedly mounted with a telescopic support rod (4), the bottom end of the telescopic support rod (4) is fixedly mounted with a lifting plate (5), the top end of the lifting plate (5) is provided with an extension shaft (6), the bottom end of the air valve is in contact with the extension shaft (6), and the output end of the motor (3) is fixedly sleeved with a cam (7); The bottom end of the workbench (1) is slidably connected to a transverse plate (14), one end of the transverse plate (14) close to the center of the workbench (1) is slidably connected to a longitudinal frame (15), a return spring (16) is fixedly installed on the top of the longitudinal frame (15), a worm (17) and a worm wheel (18) are rotatably connected in the middle of the longitudinal frame (15), a driving wheel (19) is fixedly installed on the top of the worm wheel (18), there are two driving wheels (19), and the air valve is located between the two driving wheels (19); The output ends of the motor (3) and the worm (17) are both fixedly sleeved with a transmission wheel (20), the surface of the transmission wheel (20) is transmission-connected with a transmission belt (21), the top of the base plate (2) is fixedly mounted with a support frame (22), the top of the support frame (22) is rotatably connected with a support wheel (23), one end of the support frame (22) away from the center of the workbench (1) is fixedly mounted with a tensioning spring assembly (26), the other end of the tensioning spring assembly (26) is fixedly mounted with a moving frame (24), and the middle of the moving frame (24) is rotatably connected with a tensioning wheel (25); A fixed tube (8) is fixedly installed at the bottom end of the workbench (1), a lifting shaft (9) is movably connected to the inner cavity of the fixed tube (8), a placement plate (10) is fixedly installed at the top end of the lifting shaft (9), and the valve seat is placed on the placement plate (10).

2. A diesel engine valve and valve seat mating surface grinding device according to claim 1, characterized in that: A connecting pipe (11) is fixedly installed at the bottom end of the fixed pipe (8), a transverse pipe (12) is fixedly installed at the bottom end of the workbench (1), a movable shaft (13) is slidably connected to the inner cavity of the transverse pipe (12), and the movable shaft (13) is connected to the transverse plate (14).

3. A diesel engine valve and valve seat mating surface grinding device according to claim 2, characterized in that: A connecting ring (27) is fixedly installed on the top of the workbench (1), a shunt pipe (28) is fixedly installed on the top of the connecting pipe (11), an extension pipe (32) is fixedly installed on the inner wall of the connecting ring (27), a movable shaft (33) is slidably connected to the inner cavity of the extension pipe (32), a slide rail (29) is fixedly installed on the top surface of the workbench (1), a slider (30) is slidably connected to the inner cavity of the slide rail (29), and a clamping block (31) is fixedly installed on the top of the slider (30).

4. The diesel engine valve and valve seat mating surface grinding device according to claim 1, characterized in that: The workbench (1) and the placement plate (10) are both provided with insertion holes in the middle, there are two telescopic support rods (4), which are respectively located at the front and rear sides of the insertion hole, and the two driving wheels (19) are respectively located at the left and right sides of the insertion hole.

5. The diesel engine valve and valve seat mating surface grinding device according to claim 4, characterized in that: The lifting plate (5) and the extension shaft (6) are detachably connected by thread, the axis of the extension shaft (6) and the axis of the insertion hole are on the same straight line, and the top end of the extension shaft (6) is located below the driving wheel (19).

6. The diesel engine valve and valve seat mating surface grinding device according to claim 1, characterized in that: The return spring (16) is composed of a spring and a telescopic rod sleeved inside the spring, and the top end of the return spring (16) is fixedly connected to the transverse plate (14).

7. The diesel engine valve and valve seat mating surface grinding device according to claim 1, characterized in that: The worm (17) is meshed with the worm wheel (18), and the diameter of the driving wheel (19) is greater than the diameter of the worm wheel (18).

8. The diesel engine valve and valve seat mating surface grinding device according to claim 1, characterized in that: The supporting wheel (23) and the tensioning wheel (25) are both in contact with the transmission belt (21).

9. The diesel engine valve and valve seat mating surface grinding device according to claim 3, characterized in that: The connecting ring (27) is connected to the shunt pipe (28), the connecting ring (27) is connected to the extension pipe (32), the bottom end of the movable shaft (33) is fixedly connected to the slider (30), the clamping block (31) is located above the placement plate (10), there are three clamping blocks (31), and the three clamping blocks (31) are distributed at equal angles on the outside of the placement plate (10).

10. The diesel engine valve and valve seat mating surface grinding device according to claim 1, characterized in that: A placement groove is provided at the top of the workbench (1), and the diameter of the placement groove is equal to the diameter of the placement plate (10).

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