Clamping device for forging low-temperature graphite ball valve end cover

Abstract

The invention relates to the technical field of valve machining equipment, and discloses a clamping device for forging a low-temperature graphite ball valve end cover, which comprises a fixed frame, the fixed frame is used for placing the ball valve end cover, a plurality of moving mechanisms are mounted on the fixed frame, a plurality of clamping mechanisms are arranged on the moving mechanisms, and the number of the moving mechanisms and the number of the clamping mechanisms are both set to be multiple. The clamping mechanisms are arranged on the fixing frame and annularly distributed on the fixing frame, the clamping mechanisms are driven to move through the moving mechanisms and used for clamping the ball valve end covers, the multiple independently-driven motors are adopted to drive the corresponding clamping mechanisms to move, clamping of the ball valve end covers is completed, and therefore the end covers of different types can be clamped; and meanwhile, a plurality of clamping plates in different shapes are adopted for the clamping mechanism to clamp the ball valve end covers, so that the clamping requirements of different types of end covers are further met, and the application range of the clamping device is further widened.

Description

Technical Field

[0001] The present invention relates to the technical field of valve processing equipment, and particularly to a clamping device for processing the end cover of a forged cryogenic graphite ball valve. Background Technique

[0002] A ball valve refers to a valve in which the closing member (ball) is driven by a valve stem and rotates around the axis of the ball valve. A ball valve usually consists of a valve body, a ball (valve core), a valve seat, a valve stem, a driving device and other structures. Among them, there is also an end cover of the ball valve, which is usually connected to the valve body through a flange screw cover design or a threaded tight fit method, and a gasket is installed to achieve sealing, which can effectively prevent medium leakage. At the same time, it is sleeved outside the valve stem and serves as an anti-ejection structure for the valve stem to prevent the valve stem from ejecting from the valve body under high-pressure conditions.

[0003] Currently, in the production process of common valve covers, machining steps such as turning, milling, threading, drilling and tapping are required. During these machining processes, the stable installation of the ball valve end cover needs to be ensured, which requires the use of a clamping mechanism to clamp the ball valve end cover. For example, in a rapid cutting device for processing the end cover of a forged ball valve in the prior art one (Publication No.: CN208408719U), the forged ball valve end cover is placed in a cutting groove and clamped and fixed by a compression spring and a pressing block, making it not easy to shake and improving the flatness of the cut. At the same time, in a clamping device for processing the end cover of a forged ball valve in the prior art two (Publication No.: CN108705019B), the movement of the first limit block and the second limit block is controlled by the first sliding unit and the second sliding unit respectively to adapt to the sizes of different types of end covers, and by setting two groups of limit blocks with different heights, the large end and the small end of the end cover are clamped respectively, avoiding the shaking of the workpiece during the processing and improving the working accuracy and working efficiency.

[0004] In the above-mentioned prior art one, the clamping function for the ball valve end cover is relatively single, lacking the clamping function for different types of ball valve end covers, reducing the practicability of the clamping device. In the prior art two, the ball valve end cover is clamped by setting limit blocks, and by adjusting the moving position and height of the limit blocks to adapt to different end cover clamping requirements, the effect of improving the clamping range of the clamping device is achieved. However, during the clamping process, the shape of the limit block is relatively single. Among the types of ball valve end covers, there are various end covers with different shapes and appearances, and all types cannot be clamped by the limit blocks. When different-shaped ball valve end covers need to be clamped, the limit blocks need to be replaced, reducing the working efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a clamping device for processing the end cover of a forged cryogenic graphite ball valve to solve the problems raised in the above background technique.

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions: The present invention relates to a clamping device for processing the end cover of a forged low-temperature graphite ball valve, comprising a fixed frame for placing the ball valve end cover. A moving mechanism is installed on the fixed frame, and a clamping mechanism is arranged on the moving mechanism. The numbers of the moving mechanism and the clamping mechanism are both set to be multiple and are annularly distributed on the fixed frame. The moving mechanism drives the clamping mechanism to move for clamping the ball valve end cover. The moving mechanism is driven by a separate motor, so as to adjust the position of the clamping mechanism according to the structure of the ball valve end cover to adapt to different ball valve end cover structures; the clamping mechanism is composed of a fixed seat and a clamping plate. The fixed seat is connected to the moving mechanism, and the moving mechanism drives the fixed seat to move. The clamping plate is arranged on the fixed seat, and the number of the clamping plates is set to be multiple and is annularly distributed on the fixed seat. The shapes of the multiple clamping plates are all in different states to better adapt to the clamping requirements of ball valve end covers with different shapes.

[0007] Furthermore, the moving mechanism is composed of a fixed frame, a moving motor, a moving screw rod and a moving block. The fixed frame is installed on the fixed frame, the moving motor is installed on the fixed frame, the moving screw rod is rotatably installed on the fixed frame, the moving screw rod is meshed and connected with the moving motor through a gear, the moving block is slidably installed on the moving frame, and the moving screw rod penetrates through the moving block and is threadedly connected with the moving block.

[0008] Furthermore, a cross-shaped sliding groove is formed on the fixed frame, a sliding block is slidably installed in the cross-shaped sliding groove, the bottom of the sliding block is connected to the moving block, the top of the sliding block is in contact with the fixed seat, a hollow groove is formed in the sliding block, a connecting piece is slidably installed in the hollow groove, a first pushing air bag is arranged in the hollow groove, the first pushing air bag is connected to the connecting piece, and the position of the connecting piece is adjusted by adjusting the air flow capacity in the first pushing air bag to make it in close contact with the inner wall of the cross-shaped sliding groove.

[0009] Furthermore, an installation seat is arranged on the fixed seat, the clamping plate is arranged on the installation seat, the clamping plate is installed on the fixed seat through the installation seat. A concave plug slot is formed on the fixed seat, and a part of the concave plug slot extends to the installation seat. A concave plug is arranged in the concave plug slot to form a lateral limitation on the installation seat and the fixed seat. A cover plate is arranged on the fixed seat, a bolt is arranged on the cover plate, and the bolt is threadedly connected with the fixed seat. The cover plate is connected to the fixed seat through the bolt to limit the concave plug through the cover plate to ensure the stable connection between the fixed seat and the installation seat. A positioning groove is formed on the fixed seat, a positioning block is installed on the installation seat, and the positioning block is connected to the positioning groove to form a longitudinal limitation on the installation seat and the fixed seat, thereby making the connection between the installation seat and the fixed seat stable.

[0010] Furthermore, a connecting cylinder is provided on the fixing base, a supporting cylinder is provided on the connecting cylinder, an adjusting groove is formed on the mounting base, a second driving airbag is arranged in the adjusting groove, a driving strip is arranged on the clamping plate, the driving strip is slidably connected with the adjusting groove, one side of the driving strip is connected with the second driving airbag, a connecting conduit is installed on the mounting base, one end of the connecting conduit is communicated with the second driving airbag, a connector is arranged at one end of the connecting conduit, the connector is adapted to the supporting cylinder, after the mounting base is mounted on the fixing base, the connecting conduit is communicated with the branch pipe through the connector, one end of the connecting cylinder is connected with the air guide cylinder, which is used to convey the air flow in the second driving airbag to the first driving airbag through the connecting cylinder and the air guide cylinder, a first sliding groove is formed on the fixing base, a connecting block is installed on the clamping plate, one end of the connecting block extends into the first sliding groove and is slidably connected with the first sliding groove, a first reset spring is sleeved on the connecting block, one end of the first reset spring is connected with one side inner wall of the first sliding groove, and the first reset spring is used to push and restore the clamping plate to the initial position when the clamping plate is not affected by external force.

[0011] Furthermore, two limiting rings are installed on the air guide cylinder, a movable cylinder is installed on the connecting cylinder, one end of the movable cylinder extends into the air guide cylinder and is slidably connected with the air guide cylinder, one end of the movable cylinder is T-shaped and is located between the two limiting rings, a reinforcing spring is sleeved on the movable cylinder, one end of the reinforcing spring contacts with the corresponding limiting ring, which is used to keep the connecting cylinder and the air guide cylinder in a tightly connected state when the movable cylinder is not affected by external force, so as to ensure the airtightness of air flow, a plurality of annular limiting grooves are formed on the top of the sliding block, a plurality of annular limiting protrusions are installed on the bottom of the fixing base, the limiting protrusions are adapted to the limiting grooves, through the arrangement of the limiting grooves and the limiting protrusions, the connection between the fixing base and the sliding block can be completed, and at the same time, it is convenient to rotate the fixing base to adjust the clamping plate to meet different clamping requirements of the ball valve end cover.

[0012] Furthermore, a movable part is slidably installed on the branch pipe, the movable part is composed of a guide rod and a piston, the guide rod is slidably installed on the branch pipe, the piston is slidably installed on the branch pipe, the connection between the branch pipe and the connecting cylinder can be blocked by the piston, the piston is connected with the guide rod, a return spring is sleeved on the guide rod, one end of the return spring is connected with the branch pipe, which is used to keep the piston in a stable state when the piston is not affected by external force, a driving block is slidably installed on the mounting base, a push rod is installed on the driving block, one end of the push rod extends into the branch pipe, a fourth spring is installed on the driving block, the fourth spring is used to make the driving block return to the initial position when the driving block is not affected by external force, by pushing the driving block to drive the push rod to move, the push rod drives the guide rod to move, and then drives the piston to move, so that the branch pipe is in a dredged state.

[0013] Furthermore, a sliding groove 2 is provided on the clamping plate, a pushing airbag 3 is provided in the sliding groove 2, a clamping strip is slidably installed in the sliding groove 2, the clamping strip is fixedly connected to the pushing airbag 3, a ventilation slide is provided on the clamping plate, the ventilation slide is connected to the pushing airbag 3, part of the ventilation slide extends to the pushing strip and is connected to the pushing airbag 2, and part of the air flow flows into the pushing airbag 3 through the contraction of the pushing airbag 2, thereby pushing the clamping strip to move, so that it is clamped more stably with the end cover of the ball valve.

[0014] Furthermore, a plurality of frosted strips are provided on one side of the clamping strip, and the friction strips can increase the friction coefficient between the clamping strip and the outer side of the ball valve end cover, thereby increasing the clamping stability of the ball valve end cover.

[0015] Furthermore, a resistance piece is installed on the sliding block, a placement groove is provided on the fixing frame, an avoidance through-hole is provided on the inner wall of the placement groove, the avoidance through-hole is connected to the fixing frame, the avoidance through-hole is adapted to the resistance piece, and the resistance piece is composed of a resistance tube and a resistance rod, the resistance rod is installed on the sliding block, the resistance tube is slidably installed on the resistance rod, and a resistance spring is sleeved on the resistance rod, and the resistance spring can restore the resistance tube to its original state when it is not subjected to external force.

[0016] The present invention has the following beneficial effects: (1) The present invention adopts multiple independently driven motors to drive the corresponding clamping mechanism to move and complete the clamping of the ball valve end cover, thereby being able to clamp different types of end covers, thereby improving the scope of application of the clamping device. At the same time, the present invention adopts multiple clamping plates of different shapes for the clamping mechanism to clamp the ball valve end cover, thereby further adapting to the clamping requirements of different types of end covers, further improving the scope of application of the clamping device. In addition, regarding the conversion between the clamping plates of the present invention, it is only necessary to pull the fixing seat up and rotate the fixing seat ninety degrees to complete the conversion between the clamping plates. The conversion is fast, which ensures the convenience of use of the clamping device.

[0017] (2) In the present invention, a connecting block and a return spring are provided to connect the clamping plate and the mounting seat, so that the clamping plate has a buffering effect. Therefore, when the ball valve end cover is clamped, a hard collision can be avoided during the initial contact process, thereby improving the safety of clamping the end cover. In addition, by providing a push airbag 1 and a push airbag 2, when the clamping plate is squeezed during the contact process with the ball valve end cover, the airflow conversion can be completed, so that the airflow in the push airbag 2 enters the push airbag 1, and then the push airbag 1 pushes the connector to move and make close contact with the inner wall of the cross-shaped slide groove on the fixed frame. During the whole process, the clamping plate, the mounting seat, the fixed seat, the sliding block, the fixed frame and the fixed frame are in an integrated whole. The vibration force in the process of processing the ball valve end cover can be better transmitted to the fixed frame, thereby reducing the influence of the vibration force on the clamping mechanism and ensuring the stability of the clamping mechanism in clamping the ball valve end cover. At the same time, by tightly connecting the sliding block and the fixed frame, the vibration force can be prevented from being transmitted to the moving block and the moving screw, thereby avoiding damage to the threaded connection between the moving block and the moving screw, improving the protection of the moving screw, and further improving the clamping stability of the ball valve end cover.

[0018] (3) The present invention provides a pushing airbag three and a clamping strip on the clamping plate. In the process of pushing the airbag two being squeezed and flowing outward, part of the airflow can be moved into the pushing airbag three, and then the clamping strip is pushed to contact the outer side of the ball valve end cover. The frosted strip on the clamping strip can increase the friction between the clamping strip and the outer side of the ball valve end cover, thereby further improving the clamping stability of the ball valve end cover.

[0019] (4) The present invention provides a mounting groove on the fixed frame and a resistance member on the sliding block. Therefore, in the process of clamping the ball valve end cover, the resistance member first contacts the outer side of the ball valve end cover, and under the action of the resistance spring, the resistance tube and the resistance rod are contracted. In this process, the ball valve end cover indirectly gives the sliding block a moving reverse force, and the force acts on the threaded connection between the sliding block and the moving screw. After the ball valve end cover is clamped, the threaded connection can be ensured to be more stable, thereby indirectly ensuring the stability of the ball valve end cover clamping.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the moving mechanism in the present invention; Figure 3 is the structural schematic diagram of the clamping mechanism in the present invention; Figure 4 is the cross-sectional structural schematic diagram of the sliding block in the present invention; Figure 5 is the structural schematic diagram of the fixed seat in the present invention; Figure 6 is the connection structural schematic diagram of the air guide cylinder and the connection cylinder in the present invention; Figure 7 is the connection structural schematic diagram of the mounting seat and the clamping plate in the present invention; Figure 8 is the structural schematic diagram of the clamping plate, the pushing air bag three and the clamping strip in the present invention; Figure 9 is the structural schematic diagram of the clamping strip in the present invention; Figure 10 is the cross-sectional structural schematic diagram of the connection cylinder in the present invention; Figure 11 is the cross-sectional structural schematic diagram of the connection cylinder and the fixed seat in the present invention; Figure 12 is the structural schematic diagram of the abutting member in the present invention.

[0023] In the drawings, the list of components represented by each reference numeral is as follows: In the figure: 1, fixed frame; 2, moving mechanism; 201, fixed frame; 202, moving motor; 203, moving screw; 204, moving block; 3, clamping mechanism; 4, sliding block; 5, pushing air bag one; 6, connecting member; 7, air guide cylinder; 8, fixed seat; 9, mounting seat; 10, clamping plate; 11, plug-in member; 12, cover plate; 13, connection cylinder; 14, movable cylinder; 15, pushing block; 16, push rod; 17, pushing air bag two; 18, pushing strip; 19, connecting block; 20, clamping strip; 21, pushing air bag three; 22, abutting member; 2201, abutting cylinder; 2202, abutting rod. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Please refer to Figures 1 - 12As shown in the figure, the present invention is a clamping device for processing the end cover of a forged low-temperature graphite ball valve, including a fixing frame 1 for placing the ball valve end cover. A moving mechanism 2 is installed on the fixing frame 1, and a clamping mechanism 3 is arranged on the moving mechanism 2. The numbers of the moving mechanism 2 and the clamping mechanism 3 are both set to be multiple and are annularly distributed on the fixing frame 1. The clamping mechanism 3 is driven to move by the moving mechanism 2 to complete the clamping of the ball valve end cover. The moving mechanism 2 is driven by a separate motor, so that the position of the clamping mechanism 3 can be adjusted according to the structure of the ball valve end cover, and then the clamping requirements of different ball valve end cover structures can be adapted. The moving mechanism 2 is composed of a fixing frame 201, a moving motor 202, a moving screw 203 and a moving block 204. The fixing frame 201 is installed on the fixing frame 1, the moving motor 202 is installed on the fixing frame 201, the moving screw 203 is rotatably installed on the fixing frame 201, the moving screw 203 is connected with the moving motor 202 through gear meshing, a circular gear one is sleeved at one end of the moving screw 203, a circular gear two is sleeved on the output shaft of the moving motor 202, and the circular gear one and the circular gear two are meshed and connected. The moving block 204 is slidably installed on the moving frame, and the moving screw 203 penetrates through the moving block 204 and is threadedly connected with the moving block 204; The clamping mechanism 3 is composed of a fixing seat 8 and a clamping plate 10. The fixing seat 8 is connected with the moving mechanism 2, and the fixing seat 8 is driven to move by the moving mechanism 2. The clamping plate 10 is arranged on the fixing seat 8, and the number of the clamping plates 10 is set to be multiple and is annularly distributed on the fixing seat 8. The shapes of the multiple clamping plates 10 are in different states to better adapt to the clamping requirements of ball valve end covers of different shapes.

[0026] A cross-shaped sliding groove is opened on the fixing frame 201. A sliding block 4 is slidably installed in the cross-shaped sliding groove. The bottom of the sliding block 4 is connected with the moving block 204, and the top of the sliding block 4 is in contact with the fixing seat 8. A hollow groove is opened on the sliding block 4. An adapter 6 is slidably installed in the hollow groove. A pushing airbag one 5 is arranged in the hollow groove. The pushing airbag one 5 is connected with the adapter 6. The position of the adapter 6 is adjusted by adjusting the air flow volume in the pushing airbag one 5 to make it in close contact with the inner wall of the cross-shaped sliding groove. The adapter 6 is composed of a T-shaped push plate and a spring five. The T-shaped push plate is slidably installed in the hollow groove, and the spring five is sleeved on the T-shaped push plate to restore the T-shaped push plate to its initial position when the T-shaped push plate is not affected by external forces.

[0027] The fixed seat 8 is provided with a mounting seat 9, and the clamping plate 10 is arranged on the mounting seat 9. The clamping plate 10 is mounted on the fixed seat 8 through the mounting seat 9. A concave slot is formed on the fixed seat 8, and a part of the concave slot extends to the mounting seat 9. A concave plug 11 is arranged in the concave slot. The concave plug 11 forms a lateral limitation on the mounting seat 9 and the fixed seat 8. The fixed seat 8 is provided with a cover plate 12, and bolts are arranged on the cover plate 12. The bolts are threadedly connected with the fixed seat 8. The cover plate 12 is connected to the fixed seat 8 through the bolts. The concave plug 11 is limited by the cover plate 12 to ensure the stable connection between the fixed seat 8 and the mounting seat 9. A storage groove is formed on one outer wall of the cover plate 12. The storage groove is adapted to the concave plug 11 and is used to wrap the protruding part of the concave plug 11 after the cover plate 12 is mounted on the top of the fixed seat 8, and at the same time, the concave plug 11 is also limited. A positioning groove is formed on the fixed seat 8, and a positioning block is mounted on the mounting seat 9. The positioning block is connected to the positioning groove. The positioning block and the positioning groove form a longitudinal limitation on the mounting seat 9 and the fixed seat 8, thereby making the connection between the mounting seat 9 and the fixed seat 8 stable.

[0028] A connecting cylinder 13 is arranged on the fixed seat 8, and a support cylinder is arranged on the connecting cylinder 13. An adjustment groove is formed on the mounting seat 9, and a second driving airbag 17 is arranged in the adjustment groove. A driving strip 18 is arranged on the clamping plate 10. The driving strip 18 is slidably connected to the adjustment groove. One side of the driving strip 18 is connected to the second driving airbag 17. A connecting conduit is mounted on the mounting seat 9. One end of the connecting conduit is communicated with the second driving airbag 17. A connector is arranged at one end of the connecting conduit. The connector is adapted to the support cylinder. After the mounting seat 9 is mounted on the fixed seat 8, the connecting conduit is communicated with the branch pipe through the connector. One end of the connecting cylinder 13 is connected to the air guide cylinder 7 and is used to convey the air flow in the second driving airbag 17 to the first driving airbag 5 through the connecting cylinder 13 and the air guide cylinder 7. A first sliding groove is formed on the fixed seat 8, and a connecting block 19 is mounted on the clamping plate 10. One end of the connecting block 19 extends into the first sliding groove and is slidably connected to the first sliding groove. A first return spring is sleeved on the connecting block 19. One end of the first return spring is connected to one inner wall of the first sliding groove. The first return spring is used to push the clamping plate 10 and restore it to the initial position when the clamping plate 10 is not affected by external forces.

[0029] Two limiting rings are installed on the air guide cylinder 7, and a movable cylinder 14 is installed on the connecting cylinder 13. One end of the movable cylinder 14 extends into the air guide cylinder 7 and is slidably connected to the air guide cylinder 7. One end of the movable cylinder 14 is T-shaped and is located between the two limiting rings. A reinforcing spring is sleeved on the movable cylinder 14. One end of the reinforcing spring contacts the corresponding limiting ring, which is used to keep the connecting cylinder 13 and the air guide cylinder 7 in a tightly connected state when the movable cylinder 14 is not affected by external forces, ensuring the airtightness of the air flow. A plurality of annular limiting grooves are formed in the top of the sliding block 4, and a plurality of annular limiting protrusions are installed at the bottom of the fixed seat 8. The limiting protrusions are adapted to the limiting grooves. Through the arrangement of the limiting grooves and the limiting protrusions, the connection between the fixed seat 8 and the sliding block 4 can be completed, and at the same time, it is convenient to rotate the fixed seat 8 to adjust the clamping plate 10 to meet different clamping requirements of the ball valve end cover.

[0030] A movable part is slidably installed on the branch pipe. The movable part is composed of a guide rod and a piston. The guide rod is slidably installed on the branch pipe, and the piston is slidably installed on the branch pipe. The connection between the branch pipe and the connecting cylinder 13 can be blocked by the piston. The piston is connected to the guide rod, and a return spring is sleeved on the guide rod. One end of the return spring is connected to the branch pipe, which is used to keep the piston in a stable state when it is not affected by external forces. A pushing block 15 is slidably installed on the mounting seat 9. A push rod 16 is installed on the pushing block 15. One end of the push rod 16 extends into the branch pipe. A fourth spring is installed on the pushing block 15, which is used to make the pushing block 15 return to its initial position when the pushing block 15 is not affected by external forces. By pushing the pushing block 15 to drive the push rod 16 to move, and then driving the guide rod to move through the push rod 16, and then driving the piston to move, the branch pipe is in a dredged state.

[0031] A sliding groove two is formed in the clamping plate 10. A pushing airbag three 21 is arranged in the sliding groove two. A clamping strip 20 is slidably installed in the sliding groove two. The clamping strip 20 is fixedly connected to the pushing airbag three 21. A ventilation slideway is formed in the clamping plate 10. The ventilation slideway is communicated with the pushing airbag three 21. A part of the ventilation slideway extends to the pushing strip 18 and is communicated with the pushing airbag two 17. By the contraction of the pushing airbag two 17, part of the air flow flows into the pushing airbag three 21, and then the clamping strip 20 is pushed to move, making the clamping of the ball valve end cover more stable. A plurality of abrasive strips are arranged on one side of the clamping strip 20. The friction coefficient between the clamping strip 20 and the outer side of the ball valve end cover can be increased through the friction strips, thereby increasing the clamping stability of the ball valve end cover.

[0032] A contact member 22 is installed on the sliding block 4. A placement groove is formed on the fixed frame 1. An avoidance through hole is formed on the inner wall of the placement groove. The avoidance through hole communicates with the fixed frame 201 and is adapted to the contact member 22. The contact member 22 is composed of a contact cylinder 2201 and a contact rod 2202. The contact rod 2202 is installed on the sliding block 4. The contact cylinder 2201 is slidably installed on the contact rod 2202. A contact spring is sleeved on the contact rod 2202. Through the contact spring, the contact cylinder 2201 can be restored to its initial state when it is not subject to external force.

[0033] During use, place the ball valve end cover to be processed into the placement groove on the fixed frame 1. Then, select a suitable clamping plate 10 according to the shape of the ball valve end cover and install it on the fixed seat 8. Specifically, insert the positioning block on the mounting seat 9 into the corresponding positioning groove on the fixed seat 8, and then insert the concave plug 11 into the concave slots on the mounting seat 9 and the fixed seat 8 to complete the connection between the mounting seat 9 and the fixed seat 8. Subsequently, place the cover plate 12 on the fixed seat 8 and lock it with bolts to prevent the concave plug 11 from moving. Then, start the corresponding moving motor 202 to drive the moving screw 203 to move, and then drive the corresponding clamping mechanism 3 to move. Clamp the outside of the ball valve end cover through the clamping mechanism 3 to complete the clamping operation of the ball valve end cover. During the process of the clamping mechanism 3 clamping the ball valve end cover, the clamping plate 10 first contacts the outside of the ball valve end cover and is extruded to move towards the mounting seat 9. During this process, the pushing strip 18 on the clamping plate 10 will squeeze the second pushing airbag 17. The air flow in the second pushing airbag 17 flows into the first pushing airbag 5, and then pushes the connecting member 6 to move, so that the connecting member 6 is in close contact with the inner wall of the cross-shaped sliding groove on the fixed frame 201, forming a relatively tight whole among the clamping plate 10, the mounting seat 9, the fixed seat 8, the sliding block 4, the fixed frame 201 and the fixed frame 1, thereby reducing the influence of the vibration force during the processing of the ball valve end cover on the connection between the moving block 204 and the moving screw 203, ensuring the clamping stability of the ball valve end cover. At the same time, part of the air flow in the second pushing airbag 17 flows into the third pushing airbag 21, pushing the clamping strip 20 to move and contact the outside of the ball valve end cover, further increasing the friction force between the clamping plate 10 and the outside of the ball valve end cover, thereby improving the clamping stability of the ball valve end cover. In summary, the stability of the ball valve end cover after clamping can be ensured, and the safety of processing can be guaranteed.

[0034] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A clamping device for machining the end cover of a forged cryogenic graphite ball valve, comprising a fixing frame for placing the end cover of the ball valve. It is characterized in that: A moving mechanism is installed on the fixing frame, and a clamping mechanism is arranged on the moving mechanism. The numbers of the moving mechanism and the clamping mechanism are both set to be multiple and are annularly distributed on the fixing frame. The moving mechanism drives the clamping mechanism to move for clamping the end cover of the ball valve. The moving mechanism is driven by a separate motor, so as to adjust the position of the clamping mechanism according to the structure of the end cover of the ball valve to adapt to different structures of the end cover of the ball valve; The clamping mechanism is composed of a fixed seat and a clamping plate. The fixed seat is connected to the moving mechanism, and the moving mechanism drives the fixed seat to move. The clamping plate is arranged on the fixed seat, and the number of the clamping plates is set to be multiple and is annularly distributed on the fixed seat. The shapes of the multiple clamping plates are all in different states to better adapt to the clamping requirements of the end covers of ball valves with different shapes.

2. The clamping device for processing the end cover of a forged cryogenic graphite ball valve according to claim 1, wherein: The moving mechanism is composed of a fixed frame, a moving motor, a moving screw rod and a moving block. The fixed frame is installed on the fixing frame, the moving motor is installed on the fixed frame, the moving screw rod is rotatably installed on the fixed frame, the moving screw rod is meshed and connected with the moving motor through a gear, the moving block is slidably installed on the moving frame, and the moving screw rod penetrates through the moving block and is threadedly connected with the moving block.

3. The clamping device for machining the end cover of a forged cryogenic graphite ball valve according to claim 2, wherein: A cross-shaped sliding groove is opened on the fixed frame, a sliding block is slidably installed in the cross-shaped sliding groove, the bottom of the sliding block is connected to the moving block, the top of the sliding block is in contact with the fixed seat, a hollow groove is opened on the sliding block, a connecting piece is slidably installed in the hollow groove, and a first pushing airbag is arranged in the hollow groove. The first pushing airbag is connected to the connecting piece. The position of the connecting piece is adjusted by adjusting the air flow capacity in the first pushing airbag so that it is in close contact with the inner wall of the cross-shaped sliding groove.

4. A clamping device for machining the end cover of a forged cryogenic graphite ball valve according to claim 3, characterized in that: An installation seat is arranged on the fixed seat, the clamping plate is arranged on the installation seat, the clamping plate is installed on the fixed seat through the installation seat. A concave slot is opened on the fixed seat, and a part of the concave slot extends to the installation seat. A concave plug is arranged in the concave slot. The installation seat and the fixed seat are transversely limited by the concave plug. A cover plate is arranged on the fixed seat, a bolt is arranged on the cover plate, and the bolt is threadedly connected with the fixed seat. The cover plate is connected to the fixed seat through the bolt, and the concave plug is limited by the cover plate to ensure the stable connection between the fixed seat and the installation seat. A positioning groove is opened on the fixed seat, a positioning block is installed on the installation seat, and the positioning block is connected to the positioning groove. The installation seat and the fixed seat are longitudinally limited by the positioning block and the positioning groove, so that the connection between the installation seat and the fixed seat is stable.

5. A clamping device for machining the end cover of a forged cryogenic graphite ball valve according to claim 4, characterized in that: The fixed seat is provided with a connecting cylinder, and the connecting cylinder is provided with a supporting cylinder. The mounting seat is provided with an adjusting groove, and a second pushing airbag is arranged in the adjusting groove. The clamping plate is provided with a pushing strip, and the pushing strip is slidably connected to the adjusting groove. One side of the pushing strip is connected to the second pushing airbag. A connecting conduit is installed on the mounting seat, one end of the connecting conduit is communicated with the second pushing airbag, and a connector is arranged at one end of the connecting conduit. The connector is adapted to the supporting cylinder. After the mounting seat is installed on the fixed seat, the connecting conduit is communicated with the branch pipe through the connector. One end of the connecting cylinder is connected to the air guiding cylinder, which is used to convey the air flow in the second pushing airbag to the first pushing airbag through the connecting cylinder and the air guiding cylinder. The fixed seat is provided with a first sliding groove, and a connecting block is installed on the clamping plate. One end of the connecting block extends into the first sliding groove and is slidably connected to the first sliding groove. A first return spring is sleeved on the connecting block, and one end of the first return spring is connected to the inner wall of one side of the first sliding groove. The first return spring is used to push the clamping plate and restore it to the initial position when the clamping plate is not subject to external force.

6. A clamping device for machining the end cover of a forged cryogenic graphite ball valve according to claim 5, characterized in that: Two limiting rings are installed on the air guiding cylinder, and a movable cylinder is installed on the connecting cylinder. One end of the movable cylinder extends into the air guiding cylinder and is slidably connected to the air guiding cylinder. One end of the movable cylinder is T-shaped and is located between the two limiting rings. A reinforcing spring is sleeved on the movable cylinder, and one end of the reinforcing spring contacts the corresponding limiting ring, which is used to keep the connecting cylinder and the air guiding cylinder in a tightly connected state when the movable cylinder is not subject to external force, ensuring the sealing of air flow. A plurality of annular limiting grooves are arranged at the top of the sliding block, and a plurality of annular limiting protrusions are installed at the bottom of the fixed seat. The limiting protrusions are adapted to the limiting grooves. Through the arrangement of the limiting grooves and the limiting protrusions, the connection between the fixed seat and the sliding block can be completed, and at the same time, it is convenient to rotate the fixed seat to adjust the clamping plate to meet different clamping requirements of the ball valve end cover.

7. A clamping device for processing the end cover of a forged cryogenic graphite ball valve according to claim 6, characterized in that: A movable part is slidably installed on the branch pipe. The movable part is composed of a guide rod and a piston. The guide rod is slidably installed on the branch pipe, and the piston is slidably installed on the branch pipe. The piston can block the connection between the branch pipe and the connecting cylinder. The piston is connected to the guide rod, and a return spring is sleeved on the guide rod. One end of the return spring is connected to the branch pipe, which is used to keep the piston in a stable state when the piston is not subject to external force. A pushing block is slidably installed on the mounting seat, and a push rod is installed on the pushing block. One end of the push rod extends into the branch pipe. A fourth spring is installed on the pushing block, which is used to make the pushing block return to the initial position when the pushing block is not subject to external force. By pushing the pushing block to drive the push rod to move, and then driving the guide rod to move and driving the piston to move, the branch pipe is in a dredged state.

8. A clamping device for forging the end cover processing of a low-temperature graphite ball valve according to claim 7, characterized in that: The clamping plate is provided with a second sliding groove, and a third pushing airbag is arranged in the second sliding groove. A clamping strip is slidably installed in the second sliding groove, and the clamping strip is fixedly connected to the third pushing airbag. The clamping plate is provided with a ventilation slideway, and the ventilation slideway is communicated with the third pushing airbag. Part of the ventilation slideway extends to the pushing strip and is communicated with the second pushing airbag. By the contraction of the second pushing airbag, part of the air flow flows into the third pushing airbag, and then the clamping strip is pushed to move, making the clamping of the ball valve end cover more stable.

9. A clamping device for processing the end cover of a forged cryogenic graphite ball valve according to claim 8, characterized in that: A plurality of frosted strips are provided on one side of the clamping strip, and the friction strips can increase the friction coefficient between the clamping strip and the outer side of the ball valve end cover, thereby increasing the clamping stability of the ball valve end cover.

10. A clamping device for machining the end cover of a forged cryogenic graphite ball valve according to claim 9, characterized in that: A resistance piece is installed on the sliding block, a placement groove is provided on the fixing frame, an avoidance through-hole is provided on the inner wall of the placement groove, the avoidance through-hole is communicated with the fixing frame, the avoidance through-hole is adapted to the resistance piece, and the resistance piece is composed of a resistance tube and a resistance rod, the resistance rod is installed on the sliding block, the resistance tube is slidably installed on the resistance rod, and a resistance spring is sleeved on the resistance rod, and the resistance spring can restore the resistance tube to its original state when it is not subjected to external force.

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