A valve seat sealing surface grinding and repairing device

Abstract

The present invention discloses a valve seat sealing surface grinding and repairing device, which belongs to the technical field of drilling devices. A valve seat sealing surface grinding and repairing device includes a valve body, flanges are fixedly connected to both sides of the valve body, a valve seat body is fixedly connected inside the valve body, and further includes: a connecting plate is provided on the flange, a sliding plate is slidably connected inside the connecting plate, the sliding plate is connected to a lifting plate, a rotating sleeve is connected to the lifting plate, the rotating sleeve is fixedly connected to a rotating disk, and an inclined groove and a circular sliding groove are provided on the rotating disk; a support plate is connected to the lifting plate, and a rotating disk is connected below the rotating shaft; a third sliding groove is provided on the rotating disk, and a first grinding block and a second grinding block are connected to the third sliding groove; the present invention can grind the grinding surface of the sealing seat body without disassembling the gate valve, and can switch different grinding blocks for grinding without disassembling and replacing the grinding blocks, and can perform fixed grinding on valve seats of different sizes.

Description

Technical Field

[0001] The invention relates to the technical field of drilling devices, and in particular to a valve seat sealing surface grinding and repairing device. Background Art

[0002] With the continuous advancement of industrial technology, the requirements for precise control and safe isolation of medium flow in pipelines are increasing. Gate valves, with their unique structural design and working principle, can provide reliable sealing performance in fully open or fully closed states, effectively preventing medium leakage. At the same time, gate valves have the advantages of simple structure, flexible operation, and low fluid resistance. They are widely used in the fields of petroleum, chemical industry, electric power, water treatment, etc. With the continuous development of material science and manufacturing technology, the performance and reliability of gate valves have been further improved, providing a safer and more efficient solution for industrial fluid control.

[0003] The main principle of the gate valve is to control the cutoff or flow of the medium by lifting and lowering the gate plate. Its sealing performance depends on the close fit between the gate plate and the valve seat. However, in long-term use, the valve seat may be eroded, corroded or worn by the medium, resulting in a decrease in sealing performance. Therefore, when the valve leaks, it is often necessary to grind the valve seat through a special device. However, in the existing equipment, the entire valve needs to be disassembled before the contact surface between the valve seat and the valve plate can be ground, which is very troublesome and time-consuming. Based on this, the present invention is proposed Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a valve seat sealing surface grinding and repairing device.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a valve seat sealing surface grinding and repairing equipment, comprising a valve body, flanges are fixedly connected to both sides of the valve body, a valve seat body is fixedly connected inside the valve body, and further comprising: a connecting plate is provided on the flange, a sliding plate is slidably connected inside the connecting plate, a lifting plate is connected below the sliding plate, a rotating sleeve is rotatably connected to the lifting plate, a rotating disk is fixedly connected below the rotating sleeve, an inclined groove and a circular sliding groove are respectively provided on the rotating disk; a supporting plate is connected to the lifting plate, a connecting sleeve is rotatably connected to the supporting plate, a rotating shaft is fixedly connected inside the connecting sleeve, and a rotating disk is fixedly connected below the rotating shaft; the A plurality of third sliding grooves are provided on the rotating disk, and the third sliding grooves are slidably connected to the first grinding block and the second grinding block respectively, a first connecting rod is fixedly connected to the lower part of the first grinding block, and a second connecting rod is fixedly connected to the lower part of the second grinding block; the first sliding rod and the second sliding rod are slidably connected to the inside of the circular sliding groove respectively, the first grinding block and the second grinding block are both provided with a second sliding groove, the first sliding rod and the second sliding rod are both slidably connected to the second sliding groove, and the first connecting rod and the second connecting rod are both slidably connected to the inclined groove; when the rotating disk and the limiting disk rotate in opposite directions, the first grinding block and the second grinding block slide along the direction of the third sliding groove to extend outward or retract inward.

[0006] Preferably, a first limit rod is fixedly connected to the connecting plate, the other end of the first limit rod is fixedly connected to a bottom plate, the bottom plate is fixedly connected to the limit plate via the first limit rod, the limit plate is rotatably connected to a first bolt via a thread, a conical block is fixedly connected to the first bolt, the conical block is used to be inserted into the hole on the flange to form a clamp for the flange together with the valve seat body.

[0007] Furthermore, a clamping plate is slidably connected to the first limiting rod, and tension springs are respectively connected between the clamping plate, the connecting plate and the limiting plate, and the clamping plate is used to clamp the side wall of the flange.

[0008] Preferably, a second bolt is rotatably connected to the sliding plate on one side, and a second limiting rod is fixedly connected to the sliding plate on the other side. The second limiting rod is slidably connected to the lifting plate, and the second bolt is connected to the lifting plate via a thread.

[0009] Preferably, a third limiting rod is fixedly connected to the lower side of the support plate, a third bolt is rotatably connected to the support plate, the third bolt is connected to the lifting plate via threads, and the third limiting rod is slidably connected to the lifting plate.

[0010] Preferably, the rotating sleeve is provided with two sets of relative limit teeth, and the connecting sleeve is provided with a gear ring with teeth on the upper and lower parts. When the gear ring is engaged with the limit teeth, the rotating shaft and the rotating sleeve rotate synchronously. The rotating shaft is provided with a limit hole, and the limit hole is used to connect with an external driving part.

[0011] Furthermore, a sliding block is fixedly connected to the second grinding block, a plurality of first sliding grooves are provided on the rotating disk, the sliding block is slidably connected in the first sliding grooves, and the second grinding block moves up and down synchronously with the rotating disk.

[0012] Furthermore, the second grinding block and the first grinding block are arranged in an alternating manner, the thickness of the second grinding block is smaller than that of the first grinding block, the grinding particles on the surfaces of the second grinding block and the first grinding block are two sizes of grinding particles, when the rotating disk is in contact with the limiting disk, the first grinding block is higher than the second grinding block, and the first grinding block grinds the valve seat body, and when the rotating disk drives the second grinding block to rise, the second grinding block is higher than the first grinding block, and the second grinding block grinds the valve seat body.

[0013] Preferably, a lifting slot is provided on the lifting plate, a blocking rod is slidably connected to the lifting slot, and a compression spring is connected between the blocking rod and the lifting plate.

[0014] Furthermore, a stopper is fixedly connected to the rotating shaft. When the tooth ring is located between two limiting teeth, the bottom of the stopper rod is at the same height as the stopper rod, and the stopper rod limits the rotation of the stopper rod and the rotating shaft.

[0015] Compared with the prior art, the present invention provides a valve seat sealing surface grinding and repairing device, which has the following beneficial effects: 1. The valve seat sealing surface grinding and repairing device can adjust the extension length of the first grinding block and the second grinding block through the cooperation between the limit plate and the rotating plate, so that there is no need to disassemble the gate valve. It only needs to extend from one end and adjust the extension length of the first grinding block and the second grinding block to grind the sealing surface of the valve seat body. 2. The valve seat sealing surface grinding and repairing device can achieve the effect of switching the grinding block involved in the grinding work and adjusting the extension length of the grinding block by adjusting the meshing relationship between the clamping gear ring and the limit clamping gear, thereby avoiding the problem of needing to replace the grinding block during the grinding process. 3. The valve seat sealing surface grinding and repairing device can clamp the Farah discs of different sizes by setting the first bolt and the conical block, and the depth of the grinding block can be controlled by the second bolt. With the grinding block that can be freely extended, the grinding operation can be performed on valve bodies of different sizes.

[0016] The parts not involved in the valve seat sealing surface grinding and repair equipment are the same as the prior art or can be implemented by using the prior art. The present invention can grind the grinding surface of the sealing seat body without disassembling the gate valve, and can switch different grinding blocks for grinding without disassembling and replacing the grinding blocks, and can perform fixed grinding on valve seats of different sizes, thereby improving the versatility of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a valve seat sealing surface grinding and repairing device proposed by the present invention; Figure 2 A partial view of a valve seat sealing surface grinding and repairing device proposed by the present invention; Figure 3 This is a schematic structural diagram of a connecting rod portion in a valve seat sealing surface grinding and repairing device proposed by the present invention; Figure 4 A cross-sectional view of a connecting plate portion of a valve seat sealing surface grinding and repairing device proposed by the present invention; Figure 5 A valve seat sealing surface grinding and repairing device proposed by the present invention Figure 4 A schematic diagram of the enlarged structure of part A; Figure 6 A valve seat sealing surface grinding and repairing device proposed by the present invention Figure 4 A schematic diagram of the enlarged structure of part B; Figure 7 This is a schematic structural diagram of a rotating shaft and a rotating sleeve in a valve seat sealing surface grinding and repairing device proposed by the present invention; Figure 8 A cross-sectional view of a connecting sleeve in a valve seat sealing surface grinding and repairing device proposed by the present invention; Fig. 9 This is a schematic structural diagram of a limit plate in a valve seat sealing surface grinding and repairing device proposed by the present invention; Fig.10 A schematic diagram of the structure of a rotating disk in a valve seat sealing surface grinding and repairing device proposed by the present invention; Fig.11 The present invention provides a cross-sectional view of a lifting plate in a valve seat sealing surface grinding and repairing device.

[0018] In the figure: 1, valve body; 11, flange; 12, valve seat body; 2, connecting plate; 21, bottom plate; 22, first limit rod; 23, clamping plate; 24, tension spring; 25, limit plate; 26, first bolt; 261, conical block; 27, sliding plate; 272, second limit rod; 271, second bolt; 3, limit plate; 31, connecting sleeve; 311, gear ring; 32, rotating shaft; 321, limit hole; 322, stopper; 33, support plate; 331, third limit rod ; 332, third bolt; 34, inclined groove; 35, circular sliding groove; 36, first sliding rod; 37, second sliding rod; 4, rotating disk; 41, rotating sleeve; 42, limiting tooth; 43, lifting plate; 431, lifting groove; 44, blocking rod; 441, compression spring; 45, first grinding block; 451, first connecting rod; 46, second grinding block; 461, second connecting rod; 462, sliding block; 47, first sliding groove; 48, second sliding groove; 49, third sliding groove. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] Example 1: Reference Figure 1-Figure 11, a valve seat sealing surface grinding and repairing device, comprising a valve body 1, flanges 11 are fixedly connected to both sides of the valve body 1, a valve seat body 12 is fixedly connected inside the valve body 1, and further comprising: a connecting plate 2 is provided on the flange 11, a sliding plate 27 is slidably connected inside the connecting plate 2, a lifting plate 43 is connected below the sliding plate 27, a rotating sleeve 41 is rotatably connected to the lifting plate 43, a rotating disk 4 is fixedly connected below the rotating sleeve 41, and an inclined groove 34 and a circular sliding groove 35 are respectively provided on the rotating disk 4; a supporting plate 33 is connected to the lifting plate 43, a connecting sleeve 31 is rotatably connected to the supporting plate 33, a rotating shaft 32 is fixedly connected inside the connecting sleeve 31, and a rotating disk 4 is fixedly connected below the rotating shaft 32; a plurality of third sliding grooves 49 are provided on the rotating disk 4, and the ... The three sliding grooves 49 are slidably connected to the first grinding block 45 and the second grinding block 46 respectively, the first grinding block 45 is fixedly connected with a first connecting rod 451 at the bottom, and the second grinding block 46 is fixedly connected with a second connecting rod 461 at the bottom; the inside of the circular sliding groove 35 is slidably connected with the first sliding rod 36 and the second sliding rod 37 respectively, the first grinding block 45 and the second grinding block 46 are both provided with a second sliding groove 48, the first sliding rod 36 and the second sliding rod 37 are both slidably connected to the second sliding groove 48, and the first connecting rod 451 and the second connecting rod 461 are both slidably connected to the inclined groove 34; when the rotating disk 4 and the limiting disk 3 rotate in opposite directions, the first grinding block 45 and the second grinding block 46 slide along the direction of the third sliding groove 49 to extend outward or shrink inward.

[0022] In the present invention, it is not necessary to disassemble the entire gate valve device before grinding the valve seat body 12. The user can first insert the rotating disk 4 and the limiting disk 3 through the pipeline opening at the flange 11 and extend them to the valve seat body 12. Because the first grinding block 45 and the second grinding block 46 are in a contracted state when inserted, they cannot contact the sealing surface of the valve seat body 12. When the rotating disk 4 reaches the sealing surface of the valve seat body 12, the limiting disk 3 can be driven to rotate by fixing the rotating sleeve 41 while rotating the rotating shaft 32. Under the limitation of the inclined groove 34, when the limiting disk 3 rotates in the direction inclined by the inclined groove 34, under the common limitation of the third sliding groove 49 and the inclined groove 34, the first grinding block 45 and the second grinding block 46 are The grinding block 46 will slide and extend outward along the third sliding groove 49, so that the first grinding block 45 and the second grinding block 46 can extend to a position in contact with the sealing surface of the valve seat body 12. The device can grind valve seat bodies 12 of different diameters, and then the first grinding block 45 and the second grinding block 46 can be driven to rotate synchronously with the rotating disk 4 and the limiting disk 3 to grind the sealing surface of the valve seat body 12. When the rotating disk 4 drives the first grinding block 45 to rotate, the first sliding rod 36 slides in the circular sliding groove 35 and the second sliding groove 48. The first sliding rod 36 can assist in limiting the first grinding block 45 through the limiting protrusions protruding at the upper and lower ends.

[0023] Example 2: Reference Figure 1-Figure 11 , a valve seat sealing surface grinding and repairing device, which is basically the same as embodiment 1, and further: a first limiting rod 22 is fixedly connected to the connecting plate 2, and the other end of the first limiting rod 22 is fixedly connected to the bottom plate 21, and the bottom plate 21 is fixedly connected to the limiting plate 25 through the first limiting rod 22, and the limiting plate 25 is rotatably connected to the first bolt 26 through a thread, and the first bolt 26 is fixedly connected to the conical block 261, and the conical block 261 is used to be inserted into the hole on the flange 11 and the valve seat body 12 together form a clamp for the flange 11, the first limiting rod 22 is slidably connected with a clamping plate 23, and a tension spring 24 is respectively connected between the clamping plate 23 and the connecting plate 2 and the limiting plate 25. The clamping plate 23 is used to clamp the side wall of the flange 11, and a second bolt 271 is rotatably connected to the sliding plate 27 on one side, and a second limiting rod 272 is fixedly connected to the sliding plate 27 on the other side. The second limiting rod 272 is slidably connected to the lifting plate 43, and the second bolt 271 is connected to the lifting plate 43 through a thread.

[0024] In the present invention, the conical block 261 can be driven to rise or fall by rotating the first bolt 26. Since the hole sizes of flanges 11 of different models are different, the conical block 261 can be inserted into holes of different sizes, and by squeezing the flange 11, it can form a clamping fixation for the flange 11 together with the connecting plate 2, so that the entire device can be fixed on the flange 11, which is convenient for subsequent grinding operations; since the holes and side margins on flanges 11 of different models are different, a clamping plate 23 is provided and a tension spring 24 is provided on the clamping plate 23, which are respectively connected to the limit plate 25 and the connecting plate 2, so that the side of the flange 11 can be clamped by pulling the clamping plate 23, and preliminary positioning can be performed. The conical block 261 is aligned with the hole on the flange 11 for subsequent operation; the sliding plate 27 is provided to extend the length of the connecting plate 2, so that it can be adjusted according to flanges 11 of different sizes; and a locking mechanism can be provided on the sliding plate 27 to lock and limit the sliding plate 27, and the locking mechanism includes but is not limited to common extrusion locking bolts, locking devices such as latches; by rotating the second bolt 271, the lifting plate 43 can be driven to move up and down, and the lifting plate 43 will drive the rotating sleeve 41 and the rotating shaft 32 to move, so that the depth of the downward movement of the rotating disk 4 and the limit disk 3 can be adjusted, so that the first grinding block 45 and the second grinding block 46 can grind the sealing surface of the valve seat body 12 at different depths.

[0025] Example 3: Reference Figure 1-Figure 11, a valve seat sealing surface grinding and repairing device is basically the same as embodiment 1, and further includes: a third limiting rod 331 is fixedly connected to the lower side of the support plate 33, a third bolt 332 is rotatably connected to the support plate 33, the third bolt 332 is connected to the lifting plate 43 by threading, the third limiting rod 331 is slidably connected to the lifting plate 43, two sets of opposite limiting teeth 42 are provided on the rotating sleeve 41, a toothed ring 311 with teeth on both the upper and lower sides is provided in the connecting sleeve 31, when the toothed ring 311 is engaged with the limiting teeth 42, the rotating shaft 32 and the rotating sleeve 41 rotate synchronously, a limiting hole 321 is provided on the rotating shaft 32, and the limiting hole 321 is used to connect with an external driving part, a sliding block 462 is fixedly connected to the second grinding block 46, a plurality of first sliding grooves 47 are provided on the rotating disk 4, the sliding block 462 is slidably connected in the first sliding groove 47, the second grinding block 46 moves up and down synchronously with the rotating disk 4, and the second grinding The grinding blocks 46 and the first grinding blocks 45 are arranged in an alternating manner, the thickness of the second grinding blocks 46 is smaller than that of the first grinding blocks 45, and the grinding particles on the surfaces of the second grinding blocks 46 and the first grinding blocks 45 are grinding particles of two sizes. When the rotating disk 4 is in contact with the limiting disk 3, the first grinding block 45 is higher than the second grinding block 46, and the first grinding block 45 grinds the valve seat body 12. When the rotating disk 4 drives the second grinding block 46 to rise, the second grinding block 46 is higher than the first grinding block 45, and the second grinding block 46 grinds the valve seat body 12. A lifting groove 431 is provided on the lifting plate 43, and a stopper rod 44 is slidably connected to the lifting groove 431. A compression spring 441 is connected between the stopper rod 44 and the lifting plate 43. A stopper block 322 is fixedly connected to the rotating shaft 32. When the gear ring 311 is located between the two limiting teeth 42, the bottom of the stopper rod 44 has the same height as the stopper block 322, and the stopper rod 44 limits the rotation of the stopper block 322 and the rotating shaft 32.

[0026] In the present invention, the distance between the support plate 33 and the lifting plate 43 can be adjusted by rotating the third bolt 332, and the connecting sleeve 31 moves up and down together with the supporting plate 33, and the rotating sleeve 41 moves up and down together with the lifting plate 43, so that the vertical distance between the connecting sleeve 31 and the rotating sleeve 41 can be changed by rotating the third bolt 332. When the connecting sleeve 31 drives the gear ring 311 to move up and down so that the gear ring 311 is engaged with one of the upper and lower limiting teeth 42 through the teeth, the rotating shaft 32 and the rotating sleeve 41 can rotate synchronously, and when the gear ring 311 is located between the two limiting teeth 42, the rotating shaft 32 and the rotating sleeve 41 are The rotation of the grinding wheel 4 will not be interfered with; by setting two different grinding blocks, the first grinding block 45 and the second grinding block 46, two different grinding effects can be achieved. Under the limitation of the first sliding rod 36, the first grinding block 45 is limited and will not move up and down with the rotating disk 4, and the second sliding rod 37 has no protruding block below and will not be limited by the rotating disk 4. In addition, the second grinding block 46 slides on the first sliding groove 47 through the sliding block 462, so that the second grinding block 46 will move up and down with the rotating disk 4. When the user rotates the third bolt 332 to make the gear ring 311 engage with the upper limiting gear 42, the limiting disk 3 is fitted with the rotating disk 4, and the first grinding block 45 The first grinding block 45 and the second grinding block 46 are both in contact with the limit plate 3, and the height of the first grinding block 45 is higher than that of the second grinding block 46. At this time, the second grinding block 46 cannot be in contact with the grinding surface. At this time, the first grinding block 45 performs a grinding operation, and when the tooth ring 311 meshes with the limiting tooth 42 below, the rotating shaft 32 drives the limit plate 3 to move downward together. Because the upper and lower ends of the first sliding rod 36 are both provided with protrusions that slide and limit the limit plate 3 and the first grinding block 45, the limiting plate 3 drives the first sliding rod 36 and the first grinding block 45 to move up and down synchronously, and the second sliding rod 37 has only a protrusion on the upper end that slides and limits the second grinding block 46. In addition, the second grinding block 46 is The sliding block 462 is slidably limited in the first sliding groove 47, so that the second grinding block 46 can only move up and down synchronously with the rotating disk 4. Therefore, when the limiting disk 3 moves downward, it will only drive the first grinding block 45 to move downward. After the downward movement, the height of the first grinding block 45 is lower than the height of the second grinding block 46. Therefore, the second grinding block 46 is replaced to perform the grinding work at this time. Because secondary fine grinding is often performed after coarse grinding during the grinding and repair process, switching the grinding block requires taking the device out of the valve body 1 for replacement and then putting it back in. This process is extremely time-consuming. Through the switching effect of the present device, the switching between the coarse grinding and fine grinding modes can be completed directly during the grinding process, which is extremely convenient.When it is necessary to adjust the extended length of the first grinding block 45 and the second grinding block 46, the third bolt 332 is adjusted so that the tooth ring 311 is located between the upper and lower limit teeth 42 and does not mesh with any of them. At this time, the rotating sleeve 41 and the rotating shaft 32 do not interfere with each other, and the limiting plate 3 can be driven to rotate by rotating the rotating shaft 32, thereby completing the adjustment of the extended length of the first grinding block 45 and the second grinding block 46. When the tooth ring 311 is located between the upper and lower limit teeth 42 and does not mesh with any of them, When the locking cam 311 is in the closed position, the blocking rod 44 is pushed out to the position flush with the blocking block 322 under the action of the compression spring 441. At this time, if the rotating sleeve 41 rotates, the blocking block 322 will touch the blocking rod 44, thereby limiting the rotation of the rotating sleeve 41. When the locking gear ring 311 is engaged with the limiting locking gear 42 below, the support plate 33 will squeeze the blocking rod 44 to slide into the interior of the lifting groove 431 as a whole. When the locking gear ring 311 is engaged with the limiting locking gear 42 above, the compression spring 441 will push the blocking rod 44 and the support plate 33 together. When the grinding device is raised to a height exceeding the stopper 322, the stopper 44 will not limit the rotating sleeve 41 in either state. When in use, the user first places the grinding device as a whole on the flange 11. At this time, the rotating disk 4 and the limit disk 3 extend to the sealing surface of the valve seat body 12 through the pipeline in the valve body 1. Then, the user aligns the conical block 261 with the through hole on the flange 11 and inserts the conical block 261 into the through hole of the flange 11 by rotating the first bolt 26, and clamps the flange 11 together with the connecting plate 2. After the fixation is completed, the third bolt 332 is rotated to move the tooth ring 311 to the middle of the two sets of limit teeth 42, and then the first grinding block 45 can be adjusted to extend to the required grinding length by rotating the connecting sleeve 31. After the adjustment is completed, the third bolt 332 is rotated to make the tooth ring 311 engage with the upper or lower limit teeth 42, so as to select the grinding block to be used, and finally the second bolt 271 is rotated to drive the rotating disk 4 and the limit disk 3 to move upward so that the grinding block contacts the sealing surface of the valve seat body 12. The output end of the external driving part can be plugged into the limit hole 321, and the driving part is started to drive the rotating disk 4 and the grinding block to rotate and grind. ;

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A valve seat sealing surface grinding and repairing device, comprising a valve body (1), flanges (11) being fixedly connected to both sides of the valve body (1), and a valve seat body (12) being fixedly connected inside the valve body (1), characterized in that: Also includes: The flange (11) is provided with a connecting plate (2), a sliding plate (27) is slidably connected in the connecting plate (2), a lifting plate (43) is connected below the sliding plate (27), a rotating sleeve (41) is rotatably connected to the lifting plate (43), a rotating disk (4) is fixedly connected below the rotating sleeve (41), and an inclined groove (34) and a circular sliding groove (35) are respectively provided on the rotating disk (4); the lifting plate (43) is connected to a supporting plate (33), a connecting sleeve (31) is rotatably connected to the supporting plate (33), a rotating shaft (32) is fixedly connected in the connecting sleeve (31), and a rotating disk (4) is fixedly connected below the rotating shaft (32); a plurality of third sliding grooves (49) are provided on the rotating disk (4), and a first grinding block (45) and a second grinding block (45) are slidably connected to the third sliding grooves (49). A grinding block (46), a first connecting rod (451) is fixedly connected to the bottom of the first grinding block (45), and a second connecting rod (461) is fixedly connected to the bottom of the second grinding block (46); the first sliding rod (36) and the second sliding rod (37) are slidably connected inside the circular sliding groove (35), the first grinding block (45) and the second grinding block (46) are both provided with a second sliding groove (48), the first sliding rod (36) and the second sliding rod (37) are both slidably connected to the second sliding groove (48), and the first connecting rod (451) and the second connecting rod (461) are both slidably connected to the inclined groove (34); when the rotating disk (4) and the limiting disk (3) rotate in opposite directions, the first grinding block (45) and the second grinding block (46) slide along the direction of the third sliding groove (49) to extend outward or retract inward.

2. A valve seat sealing surface grinding and repairing device according to claim 1, characterized in that: A first limiting rod (22) is fixedly connected to the connecting plate (2), the other end of the first limiting rod (22) is fixedly connected to the bottom plate (21), the bottom plate (21) is fixedly connected to the limiting plate (25) via the first limiting rod (22), a first bolt (26) is rotatably connected to the limiting plate (25) via a thread, a conical block (261) is fixedly connected to the first bolt (26), the conical block (261) is used to be inserted into a hole on the flange (11) to form a clamping mechanism for the flange (11) together with the valve seat body (12).

3. The valve seat sealing surface grinding and repairing equipment according to claim 2 is characterized in that: A clamping plate (23) is slidably connected to the first limiting rod (22), and tension springs (24) are respectively connected between the clamping plate (23) and the connecting plate (2) and the limiting plate (25). The clamping plate (23) is used to clamp the side wall of the flange (11).

4. The valve seat sealing surface grinding and repairing equipment according to claim 1, characterized in that: A second bolt (271) is rotatably connected to the sliding plate (27) on one side, and a second limiting rod (272) is fixedly connected to the sliding plate (27) on the other side. The second limiting rod (272) is slidably connected to the lifting plate (43), and the second bolt (271) is connected to the lifting plate (43) via a thread.

5. The valve seat sealing surface grinding and repairing equipment according to claim 1, characterized in that: A third limiting rod (331) is fixedly connected below the support plate (33), a third bolt (332) is rotatably connected to the support plate (33), the third bolt (332) is connected to the lifting plate (43) via a thread, and the third limiting rod (331) is slidably connected to the lifting plate (43).

6. The valve seat sealing surface grinding and repairing equipment according to claim 1, characterized in that: The rotating sleeve (41) is provided with two sets of opposing limiting latch teeth (42), and the connecting sleeve (31) is provided with a latch ring (311) having latch teeth on the upper and lower sides. When the latch ring (311) is engaged with the limiting latch teeth (42), the rotating shaft (32) and the rotating sleeve (41) rotate synchronously. The rotating shaft (32) is provided with a limiting hole (321), and the limiting hole (321) is used to connect with an external driving part.

7. The valve seat sealing surface grinding and repairing equipment according to claim 6, characterized in that: A sliding block (462) is fixedly connected to the second grinding block (46), a plurality of first sliding grooves (47) are provided on the rotating disk (4), the sliding block (462) is slidably connected in the first sliding grooves (47), and the second grinding block (46) moves up and down synchronously with the rotating disk (4).

8. The valve seat sealing surface grinding and repairing equipment according to claim 7, characterized in that: The second grinding block (46) and the first grinding block (45) are arranged in a staggered manner; the thickness of the second grinding block (46) is smaller than the thickness of the first grinding block (45); the grinding particles on the surfaces of the second grinding block (46) and the first grinding block (45) are grinding particles of two sizes; when the rotating disk (4) and the limiting disk (3) are in contact with each other, the first grinding block (45) is higher than the second grinding block (46), and the first grinding block (45) grinds the valve seat body (12); when the rotating disk (4) drives the second grinding block (46) to rise, the second grinding block (46) is higher than the first grinding block (45), and the second grinding block (46) grinds the valve seat body (12).

9. The valve seat sealing surface grinding and repairing equipment according to claim 6, characterized in that: The lifting plate (43) is provided with a lifting slot (431), a blocking rod (44) is slidably connected to the lifting slot (431), and a compression spring (441) is connected between the blocking rod (44) and the lifting plate (43).

10. The valve seat sealing surface grinding and repairing equipment according to claim 9, characterized in that: A stopper (322) is fixedly connected to the rotating shaft (32); when the toothed ring (311) is located between two limiting teeth (42), the bottom of the stopper (44) is at the same height as the stopper (322); the stopper (44) limits the rotation of the stopper (322) and the rotating shaft (32).

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