A polishing device for sealing surface of cast valve seat of a stop valve
By designing the positioning rod and polishing wheel to work together, the problem of polishing the sealing surface of the valve seat in the gate valve casting was solved, achieving high-precision sealing surface processing and ensuring accurate alignment and stable guidance between the polishing wheel and the valve seat sealing surface.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG KADA VALVE
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-21
AI Technical Summary
In the existing technology, the sealing surface of the valve seat of the gate valve casting cannot be effectively polished, and it is difficult to align the polishing wheel with the sealing surface, which affects the machining accuracy.
A device including a polishing mechanism and a clamping mechanism was designed. Through the cooperation of the positioning rod and the polishing wheel, the polishing wheel and the valve seat sealing surface are precisely positioned and aligned. The positioning rod provides guidance during the polishing process to ensure polishing accuracy.
This reduces the difficulty of aligning the polishing wheel with the valve seat sealing surface, and improves the polishing accuracy and processing quality of the sealing surface.
Smart Images
Figure CN224526807U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of valve body manufacturing technology, and in particular to a polishing device for the sealing surface of a gate valve casting. Background Technology
[0002] The valve seat of the gate valve casting has a sealing surface formed to cooperate with the valve disc between the two flow channels. The flow medium in the two flow channels is cut off by the abutment of the conical valve disc with the sealing surface. In order to ensure the sealing performance between the valve disc and the sealing surface, the flatness of the sealing surface is required to be high. However, the precision of the cast gate valve cannot meet the requirements, and the sealing surface needs to be further polished. Existing technologies, such as the utility model patent: a gate valve body processing mechanism (publication number: CN222114660U) and the utility model patent: a gate valve body polishing device (publication number: CN220944731U), can only polish the outer or inner wall of the gate valve body, but cannot specifically polish the sealing surface. If the polishing wheel is directly inserted into the gate valve casting to polish the sealing surface, there is a problem that the polishing wheel and the sealing surface are not easy to align, which will affect the processing accuracy of the sealing surface.
[0003] To address the aforementioned problems, this utility model provides improvements. Utility Model Content
[0004] This utility model proposes a polishing device for the sealing surface of the valve seat of a gate valve casting, which solves the above-mentioned problems existing in the use of the prior art.
[0005] The technical solution of this utility model is implemented as follows: A polishing device for the sealing surface of a gate valve casting includes a worktable, a clamping mechanism, and a polishing mechanism. The polishing mechanism includes a support frame, a polishing electric cylinder, a moving frame, a polishing motor, a polishing wheel, a drive motor, a drive disc, and positioning rods. The support frame is fixedly mounted on the worktable. The polishing electric cylinder is mounted on the support frame with its output shaft facing downwards. The moving frame is fixedly connected to the output shaft of the polishing electric cylinder. The polishing wheel is rotatably mounted on the moving frame via a rotating shaft and is located below the moving frame. The rotating shaft is drive-connected to the polishing motor mounted on the moving frame. The drive disc is rotatably mounted on the moving frame, coaxial with the rotating shaft, and drive-connected to the drive motor mounted on the moving frame. A plurality of positioning rods are slidably mounted on the moving frame radially along the rotating shaft and arranged in a circular array along the rotating shaft. The drive disc has a plurality of drive grooves that correspond one-to-one with the plurality of positioning rods and are inclined radially to the rotating shaft. The ends of the positioning rods form transmission rods that are held within the drive grooves.
[0006] Preferably, the clamping mechanism includes a first support plate and a second support plate respectively located on both sides below the polishing wheel on the worktable. The second support plate is provided with a movable clamping plate that can slide horizontally. The movable clamping plate is in drive cooperation with a clamping electric cylinder provided on the second support plate.
[0007] Preferably, the first support plate is provided with a fixed clamping plate opposite to the movable clamping plate, and a plurality of sliding rods are fixedly connected to the movable clamping plate and horizontally pass through the second support plate. A spring is sleeved on the sliding rod and located between the second support plate and the movable clamping plate. The output shaft of the clamping electric cylinder passes through the second support plate and is located on one side of the movable clamping plate.
[0008] Preferably, the fixing plate has a positioning protrusion.
[0009] Preferably, the fixed clamping plate and the movable clamping plate are respectively provided with a first rubber pad layer and a second rubber pad layer.
[0010] Preferably, the end of the positioning rod is provided with a first guide wheel that can roll vertically.
[0011] Preferably, the transmission rod is provided with a second guide wheel that can rotate horizontally and matches the drive groove, and the second guide wheel is held in the drive groove.
[0012] In summary, the beneficial effects of this utility model are as follows: the positioning rod can correct the position of the gate valve casting so that the polishing wheel and the valve seat sealing surface are accurately aligned, reducing the difficulty of aligning the two; and the guiding effect provided by the positioning rod when the polishing wheel moves towards the valve seat sealing surface ensures the polishing accuracy of the valve seat sealing surface. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view of point B in the middle; Figure 5 for Figure 2Enlarged view of point C in the middle; Figure 6 This is an exploded view of the polishing mechanism in this utility model; Figure 7 This is a schematic diagram of the structure of a gate valve casting processed using this utility model.
[0015] In the diagram: 1. Workbench surface; 2. Clamping mechanism; 21. First support plate; 22. Second support plate; 23. Movable clamping plate; 231. Sliding rod; 232. Spring; 233. Second rubber pad; 24. Clamping electric cylinder; 25. Fixed clamping plate; 251. Positioning protrusion; 252. First rubber pad; 3. Polishing mechanism; 31. Support frame; 32. Polishing electric cylinder; 33. Moving frame; 331. Guide rod; 332. Support sleeve; 333. Guide sleeve; 34. Polishing motor; 35. Polishing wheel; 351. Rotating shaft; 36. Drive motor; 37. Drive disc; 371. Drive groove; 38. Positioning rod; 381. Transmission rod; 382. First guide wheel; 383. Second guide wheel; 4. Gate valve casting; 41. Valve cover opening; 42. Valve seat sealing surface. Detailed Implementation
[0016] The following will refer to the appendix in the embodiments of this utility model. Figure 1-7 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0017] As shown in the figure, a polishing device for the valve seat sealing surface 42 of a gate valve casting includes a worktable 1, a clamping mechanism 2, and a polishing mechanism 3. The polishing mechanism 3 includes a support frame 31, a polishing electric cylinder 32, a moving frame 33, a polishing motor 34, a polishing wheel 35, a drive motor 36, a drive disc 37, and a positioning rod 38. The support frame 31 is fixedly mounted on the worktable 1. The polishing electric cylinder 32 is mounted on the support frame 31 with its output shaft facing downwards. The moving frame 33 is fixedly connected to the output shaft of the polishing electric cylinder 32. The polishing wheel 35 is rotatably mounted on the moving frame 33 via a rotating shaft 351 and is located below the moving frame 33. The rotating shaft 351 is drively connected to the polishing motor 34 mounted on the moving frame 33. The drive disc 37 is rotatably mounted on the moving frame 33, coaxial with the rotating shaft 351, and mounted on the moving frame 33. The drive motor 36 on the frame 33 is connected to the drive motor 36. Specifically, the rotating shaft 351 passes through the moving frame 33 and forms a support sleeve 332. The drive disk 37 is sleeved outside the support sleeve 332 and is connected to the drive motor 36 through the cooperation of the synchronous pulley and the synchronous belt. A plurality of positioning rods 38 are slidably arranged on the moving frame 33 along the rotating shaft 351 and are arranged in a ring array along the rotating shaft 351. Specifically, a plurality of guide sleeves 333 are formed on the moving frame 33. The positioning rods 38 pass through the guide sleeves 333 and their sliding direction is constrained by the guide sleeves 333. A plurality of drive grooves 371 are formed on the drive disk 37, which correspond one-to-one with the plurality of positioning rods 38 and are inclined to the radial direction of the rotating shaft 351. The end of the positioning rod 38 forms a transmission rod 381 that is held in the drive groove 371.
[0018] Specifically, the clamping mechanism 2 includes a first support plate 21 and a second support plate 22 respectively located on both sides below the polishing wheel 35 on the worktable 1. The first support plate 21 and the second support plate 22 are respectively provided with a plurality of bolts passing through the adjustment grooves opened on the worktable 1. The position of the first support plate 21 and the second support plate 22 on the worktable 1 can be adjusted by loosening the bolts so that the position of the first support plate 21 and the second support plate 22 is adapted to the length of the gate valve casting 4 to be processed. The second support plate 22 is provided with a horizontally sliding movable clamping plate 23, which is in transmission cooperation with the clamping electric cylinder 24 provided on the second support plate 22.
[0019] Specifically, in order to enhance the stability of the movable frame 33 when it moves longitudinally on the support frame 31, a number of guide rods 331 are fixedly connected to the movable frame 33 and pass through the support frame 31 longitudinally.
[0020] In the above structure, for example Figure 7When polishing the valve seat sealing surface 42 of the gate valve casting 4 shown, the position of the first support plate 21 is adjusted so that the horizontal distance from the first support plate 21 to the axis of the polishing wheel 35 is consistent with the distance from the port of the gate valve casting 4 to the axis of the valve cover opening 41 of the gate valve casting 4. The gate valve casting 4 is placed on the worktable 1 between the first support plate 21 and the second support plate 22 and below the polishing wheel 35, so that one end of the gate valve casting 4 abuts against the first support plate 21. At this time, the valve cover opening 41 of the gate valve casting 4 is roughly aligned with the polishing wheel 35 (mainly with a certain deviation along the circumference of the port of the gate valve casting 4). The lower ends of the polishing wheel 35 and the moving frame 33 can pass through the valve cover opening 41 of the gate valve casting 4, and then polishing is performed. The electric cylinder 32 drives the moving frame 33 to move downwards. The moving frame 33 drives the polishing wheel 35 and the positioning rod 38 mounted on it to pass through the valve cover opening 41 of the gate valve casting 4 in sequence. When the positioning rod 38 moves with the moving frame 33 to the inside of the valve cover opening 41 of the gate valve casting 4, the drive motor 36 drives the drive disk 37 to rotate. Since the drive groove 371 on the drive disk 37 is inclined to the radial direction of the rotating shaft 351, that is, inclined to the radial direction of the drive disk 37, the drive groove 371 will drive the transmission rod 381 held in the groove to move. However, since the sliding of the positioning rod 38 is constrained by the guide sleeve 333, it can only slide in the radial direction of the rotating shaft 351. Therefore, the transmission rod 381 drives the positioning rod 38 along the rotating shaft 351 through the action of the drive groove 371. The radial sliding causes several positioning rods 38 to slide synchronously toward the inner wall of the valve cover opening 41 of the gate valve casting 4. Since the valve cover opening 41 of the gate valve casting 4 is not completely aligned with the polishing wheel 35 at this time, the ends of some positioning rods 38 that slide synchronously toward the inner wall of the valve cover opening 41 of the gate valve casting 4 first abut against the inner wall of the valve cover opening 41 of the gate valve casting 4, thereby pushing the gate valve casting 4 to rotate circumferentially along its port until the ends of all positioning rods 38 abut against the inner wall of the valve cover opening 41 of the gate valve casting 4. At this time, through the action of the positioning rods 38, the axis of the polishing wheel 35, which is coaxial with the drive disc 37, is aligned with the axis of the valve cover opening 41 of the gate valve casting 4, thus making the polishing wheel 35 accurately aligned with the valve seat sealing surface 42. Then, the clamping... The output axis of the holding electric cylinder 24 moves along the movable clamping plate 23, causing the movable clamping plate 23 to press tightly against the other end face of the gate valve casting 4, thus cooperating with the fixed clamping plate 25 to clamp and fix the gate valve casting 4. Then, the polishing electric cylinder 32 drives the moving frame 33, which in turn drives the positioning plate and polishing wheel 35 to continue moving downward. While the positioning rod 38 is always in contact with the inner wall of the valve cover opening 41 of the gate valve casting 4, providing guidance for the polishing wheel 35 and keeping it aligned with the valve seat sealing surface 42 of the gate valve casting 4, the polishing motor 34 drives the polishing wheel 35 to rotate through the rotating shaft 351. As the polishing wheel 35 moves downward, it polishes the valve seat sealing surface 42 of the gate valve casting 4. During the above polishing process of the valve seat sealing surface 42 of the gate valve casting 4,The positioning rod 38 corrects the position of the gate valve casting 4, ensuring accurate alignment of the polishing wheel 35 with the valve seat sealing surface 42. This reduces the difficulty of aligning the two parts. Furthermore, the guiding effect provided by the positioning rod 38 as the polishing wheel 35 moves towards the valve seat sealing surface 42 guarantees the polishing accuracy of the valve seat sealing surface 42.
[0021] In addition, based on the above structure, the first support plate 21 is provided with a fixed clamping plate 25 opposite to the movable clamping plate 23. The movable clamping plate 23 is fixedly connected with a plurality of sliding rods 231 that are horizontally inserted through the second support plate 22. The sliding rods 231 are fitted with springs 232 located between the second support plate 22 and the movable clamping plate 23. The output shaft of the clamping electric cylinder 24 passes through the second support plate 22 and is located on one side of the movable clamping plate 23.
[0022] In the preferred embodiment described above, when the gate valve casting 4 is placed between the first support plate 21 and the second support plate 22, one end of the gate valve casting 4 abuts against the fixed clamping plate 25, and the movable clamping plate 23 abuts against the other end of the gate valve casting 4 under the restoring force of the spring 232, thus cooperating with the fixed clamping plate 25 to pre-clamp the gate valve casting 4. During the process of the positioning rod 38 penetrating into the valve cover opening 41 of the gate valve casting 4 and sliding and pushing the gate valve casting 4 against the inner wall of the valve cover opening 41 to correct its position so that the polishing wheel 35 is aligned with the valve seat sealing surface 42, the gate valve casting 4 is subjected to... The valve is held in place by the pre-clamping of the fixed clamping plate 25 and the movable clamping plate 23, and after the position of the gate valve casting 4 is corrected, the output axis of the clamping electric cylinder 24 moves along the movable clamping plate 23 and presses against the movable clamping plate 23. Then, the movable clamping plate 23 presses against the other end of the gate valve casting 4, and cooperates with the fixed clamping plate 25 to clamp the gate valve casting 4. In the above process, the gate valve is gradually pre-clamped by the movable clamping plate 23 and the fixed clamping plate 25, which facilitates the operation of aligning the valve seat sealing surface 42 of the gate valve casting 4 with the polishing wheel 35.
[0023] Preferably, the fixed clamping plate 25 has a positioning protrusion 251. When one end of the gate valve casting 4 is pressed against the fixed clamping plate 25, the positioning protrusion 251 that matches the port of the gate valve casting 4 passes into the port of the gate valve casting 4 to provide positioning for the gate valve casting 4 and constrain the displacement of the gate valve casting 4 in the radial direction of the positioning protrusion 251. This also enhances the stability when the movable clamping plate 23 and the fixed clamping plate 25 cooperate to clamp the gate valve casting 4.
[0024] Preferably, the fixed clamping plate 25 and the movable clamping plate 23 are respectively provided with a first rubber pad 252 and a second rubber pad 233. The first rubber pad 252 and the second rubber pad 233 increase the friction between the fixed clamping plate 25 and the movable clamping plate 23 and the end face of the gate valve casting 4, thereby strengthening the stability of the gate valve when the fixed clamping plate 25 and the movable clamping plate 23 cooperate to clamp it.
[0025] Preferably, the end of the positioning rod 38 is provided with a first guide wheel 382 that can roll vertically. When the positioning rod 38 slides toward the inner wall of the valve cover opening 41 of the shut-off valve casting 4, the first guide wheel 382 abuts against the inner wall of the valve cover opening 41. When the positioning rod 38 and the rotating polishing wheel 35 move toward the valve seat sealing surface 42 with the moving frame 33 for polishing, the rolling of the first guide wheel 382 on the inner wall of the valve cover opening 41 ensures the smoothness of the positioning cylinder movement, thereby ensuring the smoothness of the polishing wheel 35 moving downward, and thus ensuring the accuracy of polishing the valve seat sealing surface 42.
[0026] Preferably, the transmission rod 381 is provided with a second guide wheel 383 that can rotate horizontally and matches the drive groove 371. The second guide wheel 383 is held in the drive groove 371. When the drive groove 371 moves with the drive disc 37, it drives the transmission rod 381 to move. The rotation of the second guide wheel 383 in the drive groove 371 enhances the smoothness of the movement of the transmission rod 381, thereby ensuring the smoothness of the sliding of the positioning cylinder. This allows the positioning rod 38 to provide position correction and guidance for the alignment of the polishing wheel 35 and the valve seat sealing surface 42 more stably.
[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A polishing device for the sealing surface of a gate valve casting, comprising a worktable (1), a clamping mechanism (2), and a polishing mechanism (3), characterized in that: The polishing mechanism (3) includes a support frame (31), a polishing cylinder (32), a moving frame (33), a polishing motor (34), a polishing wheel (35), a drive motor (36), a drive disc (37), and a positioning rod (38). The support frame (31) is fixedly mounted on the worktable (1). The polishing cylinder (32) is mounted on the support frame (31) with its output shaft facing downwards. The moving frame (33) is fixedly connected to the output shaft of the polishing cylinder (32). The polishing wheel (35) is rotatably mounted on the moving frame (33) via a rotating shaft (351) and is located below the moving frame (33). The rotating shaft (351) is connected to the moving frame (36) and the polishing wheel (37). The polishing motor (34) on the 33) is driven and connected. The drive disk (37) is rotatably mounted on the moving frame (33) and coaxial with the rotating shaft (351) and driven and connected to the drive motor (36) mounted on the moving frame (33). A plurality of positioning rods (38) are slidably mounted on the moving frame (33) along the rotating shaft (351) and arranged in a ring array along the rotating shaft (351). A plurality of drive grooves (371) are provided on the drive disk (37) corresponding one-to-one with the plurality of positioning rods (38) and inclined to the radial direction of the rotating shaft (351). The end of the positioning rod (38) is formed with a transmission rod (381) held in the drive groove (371).
2. The polishing device for the sealing surface of the gate valve casting according to claim 1, characterized in that: The clamping mechanism (2) includes a first support plate (21) and a second support plate (22) located on both sides below the polishing wheel (35) on the worktable (1). The second support plate (22) is provided with a movable clamping plate (23) that can slide horizontally. The movable clamping plate (23) is in transmission cooperation with the clamping electric cylinder (24) provided on the second support plate (22).
3. The polishing device for the sealing surface of the gate valve casting according to claim 2, characterized in that: The first support plate (21) is provided with a fixed clamping plate (25) opposite to the movable clamping plate (23). The movable clamping plate (23) is fixedly connected with a number of sliding rods (231) that are horizontally inserted through the second support plate (22). The sliding rods (231) are fitted with springs (232) located between the second support plate (22) and the movable clamping plate (23). The output shaft of the clamping electric cylinder (24) passes through the second support plate (22) and is located on one side of the movable clamping plate (23).
4. The polishing device for the sealing surface of the valve seat of the gate valve casting according to claim 3, characterized in that: A positioning protrusion (251) is formed on the fixing plate (25).
5. The polishing device for the sealing surface of the valve seat of the gate valve casting according to claim 4, characterized in that: The fixed clamping plate (25) and the movable clamping plate (23) are respectively provided with a first rubber pad (252) and a second rubber pad (233).
6. The polishing device for the sealing surface of the gate valve casting according to claim 1, characterized in that: The end of the positioning rod (38) is provided with a first guide wheel (382) that can roll vertically.
7. The polishing device for the sealing surface of the gate valve casting according to claim 6, characterized in that: The transmission rod (381) is provided with a second guide wheel (383) that can rotate horizontally and matches the drive groove (371), and the second guide wheel (383) is held in the drive groove (371).