Valve rod repairing tool and repairing method

Abstract

The invention relates to the technical field of ship valve rod repairing, and discloses a valve rod repairing tool which comprises a transverse plate, an adjusting frame, a connecting seat and a supporting plate, a fixed arc-shaped sleeve is fixedly connected to the outer surface of the connecting plate, and a movable arc-shaped sleeve is hinged to the portion, located above the fixed arc-shaped sleeve, of the outer surface of the connecting plate. Two mounting screw holes are formed in the outer surface of the fixed arc-shaped sleeve, and a grinding wheel is arranged at one end of the connecting shaft. The fixed arc-shaped sleeve and the movable arc-shaped sleeve are matched with the fastening bolt to fix the connecting shaft, so that the grinding wheel is fixed to form a clamp, the surface of the valve rod is subjected to bevel cutting work through a milling machine, and then plane grinding work is conducted through relative rotation between the valve rod and the grinding wheel and contact between the valve rod and the grinding wheel. The grinding wheel is used for machining, the sealing face is smoother, the surface roughness is finer, the valve rod subjected to grinding machining does not need to be checked and matched again in the installation process, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship valve stem repair, and in particular to a valve stem repair tool and a repair method. Background Art

[0002] During the operation of ships, the valve stem is a common important and key processed part, which works with the valve seat. Most valve stems and valve seats adopt 120 and 90 degree sealing, and use a combination of inclined surfaces to achieve the sealing effect. They are subjected to the erosion and corrosion of fluid media for a long time and the mechanical wear caused by frequent opening and closing. They are prone to surface damage, reduced dimensional accuracy and other problems, which seriously affect the sealing performance and service life of ship valves. Therefore, the valve stem needs to be repaired.

[0003] Generally, the main valve stem is large and relatively difficult to process. Due to the high temperature and continuous piston movement during operation, the sealing surface of the valve stem is carbonized due to the high temperature, and the surface hardness is extremely high. Generally, small sealing surfaces can be slowly cut with a turning tool to remove the surface carbide layer, and then the sealing surface is processed using the integral cutting edge of the turning tool. After the lathe small carriage is corrected according to the valve stem sealing surface angle, that is, the linear error with the reference angle is less than 0.005mm, the small carriage is shaken to turn out the sealing surface. The surface can meet the flatness requirement, and then the valve body sealing surface is ground to meet the use requirements. However, the main valve stem is large and the sealing surface is wide. During turning, the surface hardness exceeds the strength of the turning tool, and the "tool let-off" and "tool collapse" phenomena often occur. In addition, the tool is easily worn, and the surface becomes uneven, which fails to meet the sealing requirements, resulting in low production efficiency, poor product quality, and high tool loss. Therefore, a valve stem repair tool and repair method are proposed. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a valve stem repair tool and a repair method to solve the problems mentioned in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a valve stem repair tool, comprising a horizontal plate, an adjusting frame, a connecting seat and a supporting plate, the side of the connecting seat is fixedly connected to a connecting plate, the outer surface of the connecting plate is fixedly connected to a fixed arc sleeve, the outer surface of the connecting plate is located above the fixed arc sleeve and is hinged with a movable arc sleeve, the movable arc sleeve and the fixed arc sleeve form a circular ring, the top outer surface of the movable arc sleeve is provided with two symmetrical rectangular grooves, the outer surface of the fixed arc sleeve is provided with two mounting screw holes, the rectangular groove of the movable arc sleeve is threadedly connected with a fastening bolt, the other end of the fastening bolt is threadedly connected to the internal thread of the mounting screw hole, the interior of the circular ring formed by the fixed arc sleeve and the movable arc sleeve is provided with a connecting shaft, and one end of the connecting shaft is provided with a grinding wheel.

[0006] As a further explanation of the present invention, the top outer surface of the support plate is fixedly connected to an adjustment seat, the top outer surface of the adjustment seat is rotatably penetrated by a support shaft, the top outer surface of the support shaft is fixedly connected to the adjustment frame, the outer surface of the adjustment seat is rotatably penetrated by a worm, the outer surface of the worm is fixedly connected to a first crank, the outer surface of the support shaft located inside the adjustment seat is fixedly sleeved with a driven gear, the interior of the adjustment seat is rotatably connected to a transmission shaft, the outer surface of the transmission shaft is fixedly sleeved with a driving gear and a worm wheel, the worm wheel is movably engaged with the outer surface of the worm, and the driving gear is movably engaged with the outer surface of the driven gear.

[0007] As a further explanation of the present invention, an L-shaped plate is installed on the bottom outer surface of the horizontal plate through bolts, a second screw is threaded through the outer surface of the L-shaped plate, and a clamping plate is rotatably connected to the top outer surface of the second screw. Mounting holes are provided at the four corners of the horizontal plate.

[0008] As a further explanation of the present invention, the top outer surface of the horizontal plate is fixedly connected to two symmetrically arranged side plates, a screw rod is rotatably connected between the two side plates, the outer surface of the screw rod is fixedly connected to a second crank, the outer surface of the screw rod is threadedly connected to a threaded block, and the top outer surface of the threaded block is fixedly connected to the support plate.

[0009] As a further explanation of the present invention, a first screw is threaded through the top outer surface of the adjustment frame, a knob is fixedly connected to the top outer surface of the first screw, and the bottom outer surface of the first screw is rotatably connected to the connecting seat.

[0010] As a further illustration of the present invention, a sliding rod is fixedly connected between the two side plates, and the threaded block is movably sleeved on the outer surface of the sliding rod.

[0011] As a further illustration of the present invention, two limiting rods are movably penetrated through the top outer surface of the adjustment frame, and the other ends of the limiting rods are fixedly connected to the connecting seat.

[0012] A valve stem repair method comprises the following steps: S1. Install the valve stem on a lathe and bevel the surface of the valve stem by milling.

[0013] S2. By placing the cross plate at a suitable position on the processing lathe and rotating the second screw, the second screw drives the clamping plate to move so that the clamping plate and the cross plate are clamped and fixed at a suitable position on the processing lathe.

[0014] S3. By rotating the second crank, the second crank drives the screw to rotate, so that the threaded block moves, and the grinding wheel is adjusted to a position corresponding to the processing surface of the valve stem.

[0015] S4. Turn the knob, which drives the first screw to rotate, adjust the position of the connecting seat, and adjust the height difference between the center of the grinding wheel and the center of the machine tool to an error of ≤0.005mm.

[0016] S5. Turn the first crank to drive the worm gear to rotate, and the worm gear drives the worm to rotate, so that the transmission shaft rotates, thereby rotating the driving gear on it, and the driving gear drives the driven gear to rotate, so that the support shaft rotates. The support shaft rotates, adjust the angle of the grinding wheel so that the angle of the grinding wheel can correspond to the end face angle of the valve stem, and work through the electric slide until the grinding wheel corresponds to the end face of the valve stem. Drive the valve stem to rotate through the lathe, and the valve stem contacts the grinding wheel for surface grinding.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The valve stem repair tooling and repair method fixes the connecting shaft by fixing the fixed arc sleeve and the movable arc sleeve with the fastening bolts, thereby solidifying the grinding wheel to form a fixture, and then rotating the worm to rotate the worm wheel, cooperating with the driving gear and the driven gear to rotate the adjustment seat, and the adjustment seat drives the grinding wheel to adjust the inclination angle of the grinding wheel. First, the surface of the valve stem is beveled by milling, and then the valve stem and the grinding wheel are relatively rotated, and the valve stem and the grinding wheel are in contact for plane grinding. After cutting the irregular joint surface, the grinding wheel is used for processing, and the sealing surface is smoother and the surface roughness is finer. The valve stem after grinding does not need to be checked and matched again during the installation process, thereby improving production efficiency.

[0018] 2. The valve stem repair tooling and repair method are as follows: a horizontal plate is placed on the processing table of a lathe, and a second screw is rotated to drive a clamping plate to rotate. The clamping plate and the horizontal plate are clamped on the processing table of the lathe. The L-shaped plate can be removed according to the actual situation of the processing table, and the horizontal plate can be fixed on the processing table by screwing bolts into the mounting holes, so that a suitable installation method can be selected according to needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front view structure of the present invention; Figure 2 This is a rear view structural diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention when viewed from above; Figure 4 It is a schematic diagram of the side cross-sectional structure of the present invention; Figure 5 It is a schematic diagram of a top-down cross-sectional structure of the present invention; Figure 6 For the present invention Figure 2 Zoom in on A in the middle; Figure 7 For the present invention Figure 4 Enlarge the middle B; Figure 8 For the present invention Figure 5 Zoom in on center C.

[0020] In the figure: 1. horizontal plate; 2. adjustment frame; 3. connecting seat; 4. connecting plate; 5. fixed arc sleeve; 6. movable arc sleeve; 7. rectangular groove; 8. fastening bolt; 9. connecting shaft; 10. grinding wheel; 11. support plate; 12. adjustment seat; 13. support shaft; 14. worm; 15. transmission shaft; 16. driving gear; 17. driven gear; 18. first crank; 19. worm gear; 20. first screw; 21. knob; 22. L-shaped plate; 23. second screw; 24. clamping plate; 25. lead screw; 26. second crank. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1-8 The present invention provides a technical solution: a valve stem repair tool, including a horizontal plate 1, an adjusting frame 2, a connecting seat 3 and a supporting plate 11, the side of the connecting seat 3 is fixedly connected to a connecting plate 4, the outer surface of the connecting plate 4 is fixedly connected to a fixed arc sleeve 5, the outer surface of the connecting plate 4 is located above the fixed arc sleeve 5 and is hinged with a movable arc sleeve 6, the movable arc sleeve 6 and the fixed arc sleeve 5 form a circular ring, the top outer surface of the movable arc sleeve 6 is provided with two symmetrical rectangular grooves 7, the outer surface of the fixed arc sleeve 5 is provided with two mounting screw holes, the rectangular groove 7 of the movable arc sleeve 6 is threadedly connected with a fastening bolt 8, the other end of the fastening bolt 8 is screwed to the inner screw of the mounting screw hole The circular ring formed by the fixed arc sleeve 5 and the movable arc sleeve 6 is provided with a connecting shaft 9, and one end of the connecting shaft 9 is provided with a grinding wheel 10. Specifically, the valve stem is first installed on a lathe, and the surface of the valve stem is cut to the irregular joint surface by milling, and the valve stem is cut beveled, and then the connecting shaft 9 is inserted into the fixed arc sleeve 5 and the movable arc sleeve 6, and the fastening bolt 8 is screwed in. The connecting shaft 9 is fixed by the fixed arc sleeve 5 and the movable arc sleeve 6, and then processed with a grinding wheel 10. The sealing surface is smoother and the surface roughness is finer. The valve stem after grinding does not need to be checked and matched again during the installation process, which improves production efficiency.

[0023] In this embodiment, the top outer surface of the support plate 11 is fixedly connected to the adjustment seat 12, the top outer surface of the adjustment seat 12 is rotatably penetrated by a support shaft 13, the top outer surface of the support shaft 13 is fixedly connected to the adjustment frame 2, the outer surface of the adjustment seat 12 is rotatably penetrated by a worm 14, the outer surface of the worm 14 is fixedly connected to a first crank 18, the outer surface of the support shaft 13 located inside the adjustment seat 12 is fixedly sleeved with a driven gear 17, the interior of the adjustment seat 12 is rotatably connected to a transmission shaft 15, the outer surface of the transmission shaft 15 is fixedly sleeved with a driving gear 16 and a worm gear 19, the worm gear 1 9 is movably engaged with the outer surface of the worm 14, and the driving gear 16 is movably engaged with the outer surface of the driven gear 17. Specifically, the first crank 18 is rotated, the first crank 18 drives the worm wheel 19 to rotate, and the worm wheel 19 drives the worm 14 to rotate, so that the transmission shaft 15 rotates, thereby rotating the driving gear 16 thereon, and the driving gear 16 drives the driven gear 17 to rotate, so that the support shaft 13 rotates, and the support shaft 13 drives the adjusting frame 2 to rotate, thereby rotating the grinding wheel 10, adjusting the angle of the grinding wheel 10 so that the angle of the grinding wheel 10 can correspond to the end face angle of the valve stem.

[0024] In this embodiment, the top outer surface of the horizontal plate 1 is fixedly connected to two symmetrically arranged side plates, and a screw rod 25 is rotatably connected between the two side plates. The outer surface of the screw rod 25 is fixedly connected to a second crank handle 26, and the outer surface of the screw rod 25 is threadedly connected to a threaded block. The top outer surface of the threaded block is fixedly connected to the support plate 11. Specifically, by rotating the second crank handle 26, the second crank handle 26 drives the screw rod 25 to rotate, and the screw rod 25 drives the threaded block to move, so that the support plate 11 moves and the position of the grinding wheel 10 is adjusted.

[0025] In this embodiment, a first screw 20 is threaded through the top outer surface of the adjusting frame 2, a knob 21 is fixedly connected to the top outer surface of the first screw 20, and the bottom outer surface of the first screw 20 is rotatably connected to the connecting seat 3. Specifically, by rotating the knob 21, the knob 21 drives the first screw 20 to rotate, adjusting the position of the connecting seat 3, thereby adjusting the height difference between the center of the grinding wheel 10 and the center of the machine tool to a position where the error is ≤0.005mm.

[0026] In this embodiment, a sliding rod is fixedly connected between the two side plates, and the threaded block is movably mounted on the outer surface of the sliding rod. Specifically, when the screw rod 25 rotates to drive the threaded block to move, the threaded block slides on the outer surface of the sliding rod, preventing the threaded block from rotating with the rotation of the screw rod 25.

[0027] In this embodiment, two limit rods are movably passed through the top outer surface of the adjustment frame 2, and the other end of the limit rod is fixedly connected to the connecting seat 3. Specifically, when the first screw 20 rotates to drive the connecting seat 3 to move, the limit rod moves accordingly, and the connecting seat 3 is limited by the limit rod to prevent the connecting seat 3 from rotating with the rotation of the first screw 20.

[0028] During the specific implementation process, by unscrewing the fastening bolt 8, the connecting shaft 9 is inserted into the interior of the fixed arc sleeve 5 and the movable arc sleeve 6, and the fastening bolt 8 is screwed in. The connecting shaft 9 is fixed by the fixed arc sleeve 5 and the movable arc sleeve 6, and then the second crank 26 is turned. The second crank 26 drives the screw rod 25 to rotate so that the threaded block moves, and the threaded block drives the support plate 11 to move, and the grinding wheel 10 is adjusted to a position corresponding to the valve stem processing surface. The knob 21 is turned, and the knob 21 drives the first screw rod 20 to rotate, and the height of the connecting seat 3 is adjusted, thereby adjusting the height of the grinding wheel 10, and the height difference between the center of the grinding wheel 10 and the center of the machine tool is adjusted to an error of ≤0.005mm. Then, the angle of the grinding wheel 10 is adjusted. At this time, the first crank 18 is turned, and the first crank 18 drives the worm gear 19 to rotate, and the worm gear 19 drives The worm 14 rotates, causing the transmission shaft 15 to rotate, thereby causing the driving gear 16 thereon to rotate, and the driving gear 16 drives the driven gear 17 to rotate, causing the support shaft 13 to rotate, and the support shaft 13 drives the adjusting frame 2 to rotate, thereby causing the grinding wheel 10 to rotate, and the angle of the grinding wheel 10 is adjusted so that the angle of the grinding wheel 10 can correspond to the end face angle of the valve stem. Finally, the electric slide rail is used until the grinding wheel 10 corresponds to the end face of the valve stem, and the valve stem is driven to rotate by the lathe. The valve stem and the grinding wheel 10 rotate relative to each other, and the valve stem and the grinding wheel 10 contact to perform surface grinding. After cutting the irregular joint surface, the grinding wheel 10 is used for processing, and the sealing surface is smoother and the surface roughness is finer. The valve stem after grinding does not need to be checked and matched again during the installation process, thereby improving production efficiency.

[0029] Example 2: Please refer to Figures 1-8 The present invention provides a technical solution: in this embodiment, an L-shaped plate 22 is installed on the bottom outer surface of the horizontal plate 1 by bolts, and a second screw 23 is threaded through the outer surface of the L-shaped plate 22, and the top outer surface of the second screw 23 is rotatably connected to a clamping plate 24. Mounting holes are provided at the four corners of the horizontal plate 1. Specifically, the horizontal plate 1 is placed at a suitable position on the processing lathe, and the second screw 23 is rotated. The second screw 23 drives the clamping plate 24 to move so that the clamping plate 24 and the horizontal plate 1 are clamped and fixed in a suitable position on the processing lathe. According to the actual situation of the processing table, the L-shaped plate 22 can be disassembled, and the horizontal plate 1 can be fixed to the processing table by screwing the bolts into the mounting holes, so that the appropriate installation method can be selected according to needs.

[0030] Example 3: Please refer to Figures 1-8 The present invention provides a valve stem repair method, comprising the following steps: S1. Install the valve stem on a lathe and bevel the surface of the valve stem by milling.

[0031] S2. By placing the transverse plate 1 at a suitable position on the processing lathe and rotating the second screw 23, the second screw 23 drives the clamping plate 24 to move so that the clamping plate 24 and the transverse plate 1 are clamped and fixed at a suitable position on the processing lathe.

[0032] S3. By rotating the second crank 26, the second crank 26 drives the screw rod 25 to rotate so that the threaded block moves, and the grinding wheel 10 is adjusted to a position corresponding to the valve stem processing surface.

[0033] S4. Turn the knob 21 to rotate the first screw 20, adjust the position of the connecting seat 3, and adjust the height difference between the center of the grinding wheel 10 and the center of the machine tool to an error of ≤0.005mm.

[0034] S5. Turn the first crank 18 to drive the worm gear 19 to rotate. The worm gear 19 drives the worm 14 to rotate, so that the transmission shaft 15 rotates, thereby rotating the driving gear 16 thereon. The driving gear 16 drives the driven gear 17 to rotate, so that the support shaft 13 rotates. The support shaft 13 rotates, adjusts the angle of the grinding wheel 10 so that the angle of the grinding wheel 10 can correspond to the end face angle of the valve stem, and works through the electric slide until the grinding wheel 10 corresponds to the end face of the valve stem. The valve stem is driven to rotate by the lathe, and the valve stem contacts the grinding wheel 10 for surface grinding.

[0035] Working principle: When the present invention is in use, the valve stem is first installed on the lathe, and the surface of the valve stem is cut to the irregular joint surface by milling and turning, and the valve stem is cut to the bevel, and the cross plate 1 is placed in the appropriate position of the processing lathe, and the second screw 23 is rotated. The second screw 23 drives the clamping plate 24 to move so that the clamping plate 24 and the cross plate 1 are clamped and fixed in the appropriate position of the processing lathe, thereby fixing the cross plate 1, and by unscrewing the fastening bolt 8, the connecting shaft 9 is inserted into the interior of the fixed arc sleeve 5 and the movable arc sleeve 6, and the fastening bolt 8 is screwed in. The connecting shaft 9 is fixed by the fixed arc sleeve 5 and the movable arc sleeve 6, and then by rotating the second crank 26, the second crank 26 drives the screw rod 25 to rotate so that the threaded block moves, and the threaded block drives the support plate 11 to move, and the grinding wheel 10 is adjusted to the position corresponding to the valve stem processing surface, and the knob 21 is turned. The knob 21 drives the first screw 20 to rotate, adjusts the height of the connecting seat 3, thereby adjusting the height of the grinding wheel 10, and aligns the center of the grinding wheel 10 with the machine tool The height difference of the center is adjusted to an error of ≤0.005mm, and then the angle of the grinding wheel 10 is adjusted. At this time, the first crank 18 is rotated, and the first crank 18 drives the worm wheel 19 to rotate, and the worm wheel 19 drives the worm 14 to rotate, so that the transmission shaft 15 rotates, thereby rotating the driving gear 16 thereon, and the driving gear 16 drives the driven gear 17 to rotate, so that the support shaft 13 rotates, and the support shaft 13 drives the adjusting frame 2 to rotate, thereby rotating the grinding wheel 10, adjusting the angle of the grinding wheel 10 so that the angle of the grinding wheel 10 can correspond to the end face angle of the valve stem, and finally working through the electric slide until the grinding wheel 10 corresponds to the end face of the valve stem, and the valve stem is driven by the lathe to rotate, and the valve stem and the grinding wheel 10 rotate relative to each other. The valve stem and the grinding wheel 10 contact and perform surface grinding. After cutting the irregular joint surface, the grinding wheel 10 is used for processing, and the sealing surface is smoother and the surface roughness is finer. The valve stem after grinding does not need to be checked and matched again during the installation process, thereby improving production efficiency.

[0036] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A valve stem repair tool, comprising a horizontal plate (1), an adjustment frame (2), a connecting seat (3) and a support plate (11), characterized in that: The side of the connecting seat (3) is fixedly connected to a connecting plate (4), the outer surface of the connecting plate (4) is fixedly connected to a fixed arc sleeve (5), the outer surface of the connecting plate (4) is hinged with a movable arc sleeve (6) above the fixed arc sleeve (5), the movable arc sleeve (6) and the fixed arc sleeve (5) form a circular ring, the top outer surface of the movable arc sleeve (6) is provided with two symmetrical rectangular grooves (7), the outer surface of the fixed arc sleeve (5) is provided with two mounting screw holes, the rectangular groove (7) of the movable arc sleeve (6) is threadedly connected to a fastening bolt (8), the other end of the fastening bolt (8) is threadedly connected to the inner part of the mounting screw hole, the inside of the circular ring formed by the fixed arc sleeve (5) and the movable arc sleeve (6) is provided with a connecting shaft (9), and one end of the connecting shaft (9) is provided with a grinding wheel (10).

2. The valve stem repair tool according to claim 1, characterized in that: The top outer surface of the support plate (11) is fixedly connected to an adjustment seat (12), the top outer surface of the adjustment seat (12) is rotatably penetrated by a support shaft (13), the top outer surface of the support shaft (13) is fixedly connected to the adjustment frame (2), the outer surface of the adjustment seat (12) is rotatably penetrated by a worm (14), the outer surface of the worm (14) is fixedly connected to a first crank (18), the outer surface of the support shaft (13) located inside the adjustment seat (12) is fixedly sleeved with a driven gear (17), the interior of the adjustment seat (12) is rotatably connected to a transmission shaft (15), the outer surface of the transmission shaft (15) is fixedly sleeved with a driving gear (16) and a worm wheel (19), the worm wheel (19) is movably engaged with the outer surface of the worm (14), and the driving gear (16) is movably engaged with the outer surface of the driven gear (17).

3. The valve stem repair tool according to claim 1, characterized in that: An L-shaped plate (22) is mounted on the bottom outer surface of the transverse plate (1) via bolts, a second screw rod (23) is threadedly passed through the outer surface of the L-shaped plate (22), and a clamping plate (24) is rotatably connected to the top outer surface of the second screw rod (23), and mounting holes are provided at the four corners of the transverse plate (1).

4. The valve stem repair tool according to claim 1, characterized in that: The top outer surface of the transverse plate (1) is fixedly connected to two symmetrically arranged side plates, a screw rod (25) is rotatably connected between the two side plates, the outer surface of the screw rod (25) is fixedly connected to a second crank (26), the outer surface of the screw rod (25) is threadedly connected to a threaded block, and the top outer surface of the threaded block is fixedly connected to the support plate (11).

5. The valve stem repair tool according to claim 1, characterized in that: A first screw rod (20) is threadedly passed through the top outer surface of the adjustment frame (2), a knob (21) is fixedly connected to the top outer surface of the first screw rod (20), and a bottom outer surface of the first screw rod (20) is rotatably connected to the connecting seat (3).

6. The valve stem repair tool according to claim 4, characterized in that: A sliding rod is fixedly connected between the two side plates, and the threaded block is movably sleeved on the outer surface of the sliding rod.

7. The valve stem repair tool according to claim 1, characterized in that: Two limiting rods are movably passed through the top outer surface of the adjustment frame (2), and the other ends of the limiting rods are fixedly connected to the connecting seat (3).

8. A repair method for a valve stem repair tool according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Install the valve stem on a lathe and bevel the surface of the valve stem by milling. S2, by placing the horizontal plate (1) at a suitable position on the processing lathe and rotating the second screw (23), the second screw (23) drives the clamping plate (24) to move so that the clamping plate (24) and the horizontal plate (1) are clamped and fixed at a suitable position on the processing lathe; S3, by rotating the second crank (26), the second crank (26) drives the screw rod (25) to rotate so that the threaded block moves, and the grinding wheel (10) is adjusted to a position corresponding to the machining surface of the valve stem; S4, turning the knob (21), the knob (21) drives the first screw (20) to rotate, adjusting the position of the connecting seat (3), and adjusting the height difference between the center of the grinding wheel (10) and the center of the machine tool to an error of ≤0.005mm; S5. Rotate the first crank (18) to drive the worm wheel (19) to rotate, the worm wheel (19) drives the worm (14) to rotate, so that the transmission shaft (15) rotates, thereby rotating the driving gear (16) thereon, and the driving gear (16) drives the driven gear (17) to rotate, so that the support shaft (13) rotates, and the support shaft (13) rotates, adjusts the angle of the grinding wheel (10) so that the angle of the grinding wheel (10) can correspond to the end face angle of the valve stem, and works through the electric slide until the grinding wheel (10) corresponds to the end face of the valve stem, drives the valve stem to rotate through the lathe, and the valve stem contacts the grinding wheel (10) to perform surface grinding.

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