Clamping device for valve trim machining

Abstract

The utility model relates to the field of valve trim machining, in particular to a clamping device for valve trim machining. The technical problems that in the process of cutting a thin bar to machine a valve rod, due to the fact that the slenderness of the valve rod is large and the rigidity of the valve rod is relatively low, if a clamping point of the valve rod is too far away from a cutting point, cutting force may cause elastic deformation of the valve rod, even may cause plastic deformation and cause bending of the valve rod are solved. According to the technical scheme, the clamping device for valve trim machining comprises a rotary disc assembly, a side position fixing assembly, an up-down fixing assembly and a rolling fixing assembly. By arranging the sliding clamping device, when a clamped and rotated bar is cut by a cutter, the distance between a clamping point and a cutting point of the bar is kept unchanged, so that elastic deformation and even plastic deformation caused by cutting force to a valve rod which is large in slenderness ratio and relatively low in self-rigidity are reduced, and the service life of the valve rod is prolonged. And therefore, the valve rod is bent.

Description

Technical Field

[0001] The utility model relates to the field of valve internals processing, in particular to a clamping device for valve internals processing. Background Art

[0002] Valve internals refer to the key components that make up the inside of a valve. They are directly involved in the fluid control process to ensure that the valve can be opened, closed, or the flow rate adjusted in a predetermined manner. Valve internals mainly include: valve disc, valve seat, valve stem, valve cover, packing, guide, lifting mechanism, spring, positioner. However, in the process of cutting a relatively thin rod to process the valve stem, due to the large slenderness ratio of the valve stem and its relatively low stiffness, if the clamping point of the valve stem is too far from the cutting point, the cutting force may cause elastic deformation of the valve stem, and may even cause plastic deformation, resulting in bending, and further scrapping the workpiece, increasing production costs. Summary of the Utility Model

[0003] In order to overcome the problem that in the process of cutting a relatively thin rod to process the valve stem, due to the large slenderness ratio of the valve stem and its relatively low stiffness, if the clamping point of the valve stem is too far from the cutting point, the cutting force may cause elastic deformation of the valve stem, and may even cause plastic deformation, resulting in its bending.

[0004] The technical solution of the utility model is: a clamping device for valve internals processing, including a turntable assembly, a side fixing assembly, an upper and lower fixing assembly, and a rolling fixing assembly; a side fixing assembly for fixing both ends of the rod is installed inside the turntable assembly; an upper and lower fixing assembly for fixing the upper and lower ends of the rod is arranged at the upper and lower ends of the side fixing assembly; a rolling fixing assembly for cooperating with the upper and lower fixing assemblies to prevent the rod from deforming is arranged inside the upper and lower fixing assemblies.

[0005] Preferably, the turntable assembly is used to rotate the fixed rod so that it can be processed into a valve stem by a tool, the side fixing assembly is used to fix both ends of the rod, the upper and lower fixing assemblies are used to fix the upper and lower ends of the rod, and the rolling fixing assembly is used to cooperate with the upper and lower fixing assemblies to prevent the rod from deforming.

[0006] As a preference, the turntable assembly includes a chuck, a connecting block, a motor, a first installation groove, and a second installation groove; a connecting block is fixedly connected to the rear end of the chuck; the connecting block is rotationally connected to the motor through a connecting shaft and a coupling; a first installation groove is opened inside the chuck; second installation grooves are arranged at the upper and lower ends of the first installation groove. After the rod is fixed on the chuck, starting the motor to rotate the chuck can rotate the rod so that the rod can be cut and processed into a valve stem by a tool.

[0007] Preferably, the side fixing assembly includes a first hydraulic cylinder, a first sliding sleeve, a first shock absorber, a first pushing block, and an anti-slip strip; both sides in the first installation groove are fixedly connected with the first hydraulic cylinder; the first hydraulic cylinder is fixedly connected with the first sliding sleeve; the first shock absorber is fixedly connected inside the first sliding sleeve; one end of the first shock absorber is fixedly connected with the first pushing block that is slidably connected with the first sliding sleeve; the anti-slip strip is fixedly connected to the first pushing block. After the bar stock is inserted into the chuck, the first hydraulic cylinder pushes the first pushing block, so that the first pushing block clamps both sides of the bar stock by means of the anti-slip strip. Subsequently, the second hydraulic cylinder displaces the slider forward, and then the third hydraulic cylinder pushes the second pushing block, so that the second pushing block clamps the upper and lower ends of the bar stock by means of the arc-shaped roller. When cutting the bar stock, the anti-slip strip is used to prevent the bar stock from sliding and being deformed by clamping, while the first shock absorber and the second shock absorber are used to suppress the vibration of the equipment, and the rear end of the slider will always abut against the second installation groove.

[0008] Preferably, the upper and lower fixing assembly includes a second hydraulic cylinder, a slider, a third hydraulic cylinder, a second sliding sleeve, a second shock absorber, and a second pushing block; both the upper and lower ends in the second installation groove are fixedly connected with the second hydraulic cylinder; the front end of the second hydraulic cylinder is fixedly connected with the slider that is slidably connected with the second installation groove; the third hydraulic cylinder is fixedly connected inside the slider.

[0009] Preferably, the third hydraulic cylinder is fixedly connected with the second sliding sleeve; the second shock absorber is fixedly connected inside the second sliding sleeve; one end of the second shock absorber is fixedly connected with the second pushing block that is slidably connected with the second sliding sleeve.

[0010] Preferably, the rolling fixing assembly includes a third installation groove, a fixing ring, a ball, and an arc-shaped roller; a third installation groove is formed inside the second pushing block; two fixing rings are fixedly connected inside the third installation groove.

[0011] Preferably, several balls are embedded in the fixing ring; the arc-shaped roller is rotatably connected to the fixing ring. When the rotating bar stock is cut by the tool, the tool will slowly approach the chuck, and at the same time, the second hydraulic cylinder slowly retracts the slider, so that the cutting position of the tool is not too far from the clamped position of the bar stock, thereby reducing the probability of the bar stock bending. While the slider retracts, the arc-shaped roller slides in the fixing ring by means of the ball, so that the second pushing block can continuously clamp the bar stock by means of the arc-shaped roller when the slider retracts.

[0012] The beneficial effects of the present utility model:

[0013] 1. By setting the sliding clamping device, when the bar stock that is clamped and then rotated is cut by the tool, the distance between the clamping point and the cutting point of the bar stock remains unchanged, so as to reduce the possibility that the cutting force causes elastic deformation, and even plastic deformation, of the valve rod with a relatively large length-diameter ratio and relatively low self-rigidity, thereby causing the valve rod to bend;

[0014] 2. After inserting the bar stock into the chuck, the first hydraulic cylinder pushes the first push block, and the first push block clamps both sides of the bar stock with the help of the anti-slip strips. Subsequently, the second hydraulic cylinder displaces the slider forward, and then the third hydraulic cylinder pushes the second push block, and the second push block clamps the upper and lower ends of the bar stock with the help of the arc-shaped rollers. When cutting the bar stock, the anti-slip strips are used to prevent the bar stock from sliding and being clamped and deformed, and the first shock absorber and the second shock absorber are used to suppress the vibration of the equipment. The rear end of the slider will always abut against the second installation groove. When the rotating bar stock is cut by the tool, the tool will slowly approach the chuck, and at the same time, the second hydraulic cylinder slowly retracts the slider. While the slider retracts, the arc-shaped rollers slide in the fixed ring with the help of the balls, so that the second push block can continuously clamp the bar stock with the arc-shaped rollers when the slider retracts, so that the cutting position of the tool will not be too far from the clamped position of the bar stock, reducing the probability of the bar stock bending. And because the contact surfaces of the anti-slip strips and the arc-shaped rollers that contact the bar stock during the clamping process are curved surfaces that fit the bar stock, the bar stock is clamped more firmly, and the shock absorption effect of the first shock absorber and the second shock absorber is more significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure shows a schematic diagram of the chuck structure of the present invention;

[0016] Figure 2 The figure shows a schematic diagram of the second installation groove structure of the present invention;

[0017] Figure 3 The figure shows a schematic diagram of the second hydraulic cylinder structure of the present invention;

[0018] Figure 4 The figure shows a schematic diagram of the second sliding sleeve structure of the present invention;

[0019] Figure 5 The figure shows a schematic diagram of the first shock absorber structure of the present invention;

[0020] Figure 6 The figure shows a schematic diagram of the arc-shaped roller structure of the present invention;

[0021] Figure 7 The figure shows a schematic diagram of the fixed ring structure of the present invention;

[0022] Figure 8 The figure shows a front view of the anti-slip strip structure of the present invention;

[0023] Figure 9 The figure shows a schematic diagram of the overall structure of the present invention.

[0024] Description of reference numerals in the drawings: 1, turntable assembly; 2, side fixing assembly; 3, upper and lower fixing assembly; 4, rolling fixing assembly; 101, chuck; 102, connecting block; 103, motor; 104, first installation groove; 105, second installation groove; 201, first hydraulic cylinder; 202, first sliding sleeve; 203, first shock absorber; 204, first push block; 205, anti-slip strip; 301, second hydraulic cylinder; 302, slider; 303, third hydraulic cylinder; 304, second sliding sleeve; 305, second shock absorber; 306, second push block; 401, third installation groove; 402, fixing ring; 403, ball; 404, arc-shaped roller. Detailed implementation manners

[0025] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0026] Please refer to Figures 1-5, the present utility model provides an embodiment: a clamping device for machining valve internals, including a turntable assembly 1, a side fixing assembly 2, an upper and lower fixing assembly 3, and a rolling fixing assembly 4; a side fixing assembly 2 for fixing both ends of a fixed bar stock is installed inside the turntable assembly 1; an upper and lower fixing assembly 3 for fixing the upper and lower ends of the bar stock is arranged at the upper and lower ends of the side fixing assembly 2; a rolling fixing assembly 4 for cooperating with the upper and lower fixing assembly 3 to prevent the bar stock from deforming is arranged inside the upper and lower fixing assembly 3. The turntable assembly 1 is used to rotate the fixed bar stock so that it can be machined into a valve stem by a cutting tool. The side fixing assembly 2 is used to fix both ends of the bar stock. The upper and lower fixing assembly 3 is used to fix the upper and lower ends of the bar stock. The rolling fixing assembly 4 is used to cooperate with the upper and lower fixing assembly 3 to prevent the bar stock from deforming. The turntable assembly 1 includes a chuck 101, an adapter block 102, a motor 103, a first installation groove 104, and a second installation groove 105; the rear end of the chuck 101 is fixedly connected with the adapter block 102; the adapter block 102 is rotationally connected to the motor 103 through a connecting shaft and a coupling; a first installation groove 104 is formed inside the chuck 101; second installation grooves 105 are arranged at the upper and lower ends of the first installation groove 104. After the bar stock is fixed on the chuck 101, the motor 103 is started to rotate the chuck 101, so that the bar stock can be rotated to be machined into a valve stem by a cutting tool. The side fixing assembly 2 includes a first hydraulic cylinder 201, a first sliding sleeve 202, a first shock absorber 203, a first push block 204, and an anti-slip strip 205; first hydraulic cylinders 201 are fixedly connected to both sides inside the first installation groove 104; a first sliding sleeve 202 is fixedly connected to the first hydraulic cylinder 201; a first shock absorber 203 is fixedly connected inside the first sliding sleeve 202; one end of the first shock absorber 203 is fixedly connected with a first push block 204 that is slidably connected to the first sliding sleeve 202; an anti-slip strip 205 is fixedly connected to the first push block 204. After the bar stock is inserted into the chuck 101, the first hydraulic cylinder 201 pushes the first push block 204, so that the first push block 204 clamps both sides of the bar stock by means of the anti-slip strip 205. Subsequently, the second hydraulic cylinder 301 makes the slider 302 move forward, and then the third hydraulic cylinder 303 pushes the second push block 306, so that the second push block 306 clamps the upper and lower ends of the bar stock by means of the arc-shaped roller 404. When cutting the bar stock, the anti-slip strip 205 is used to prevent the bar stock from sliding and being clamped and deformed, while the first shock absorber 203 and the second shock absorber 305 are used to suppress the vibration of the equipment, and the rear end of the slider 302 will always abut against the second installation groove 105. The upper and lower fixing assembly 3 includes a second hydraulic cylinder 301, a slider 302, a third hydraulic cylinder 303, a second sliding sleeve 304, a second shock absorber 305, and a second push block 306; second hydraulic cylinders 301 are fixedly connected to the upper and lower ends inside the second installation groove 105; the front end of the second hydraulic cylinder 301 is fixedly connected with a slider 302 that is slidably connected to the second installation groove 105; a third hydraulic cylinder 303 is fixedly connected inside the slider 302.A second sliding sleeve 304 is fixedly connected to the third hydraulic cylinder 303; a second shock absorber 305 is fixedly connected inside the second sliding sleeve 304; one end of the second shock absorber 305 is fixedly connected to a second push block 306 that is slidably connected to the second sliding sleeve 304.

[0027] Please refer to Figures 6-9 In this embodiment, the rolling fixing assembly 4 includes a third installation groove 401, a fixing ring 402, a ball 403, and an arc-shaped roller 404; a third installation groove 401 is formed in the second push block 306; two fixing rings 402 are fixedly connected inside the third installation groove 401. Several balls 403 are embedded in the fixing ring 402; an arc-shaped roller 404 is rotatably connected to the fixing ring 402. When the tool cuts the rotating bar stock, the tool will slowly approach the chuck 101, and at the same time, the second hydraulic cylinder 301 will slowly retract the slider 302, so that the cutting position of the tool will not be too far from the clamped position of the bar stock, thereby reducing the probability of the bar stock bending. While the slider 302 retracts, the arc-shaped roller 404 slides in the fixing ring 402 by means of the balls 403, so that the second push block 306 can continuously clamp the bar stock with the help of the arc-shaped roller 404 when the slider 302 retracts.

[0028] When working, after the bar stock is inserted into the chuck 101, the first hydraulic cylinder 201 pushes the first push block 204, so that the first push block 204 clamps both sides of the bar stock with the help of the anti-slip strips 205. Subsequently, the second hydraulic cylinder 301 displaces the slider 302 forward, and then the third hydraulic cylinder 303 pushes the second push block 306, so that the second push block 306 clamps the upper and lower ends of the bar stock with the help of the arc-shaped roller 404. When cutting the bar stock, the anti-slip strips 205 are used to prevent the bar stock from sliding and being clamped and deformed, and the first shock absorber 203 and the second shock absorber 305 are used to suppress the vibration of the equipment, and the rear end of the slider 302 will always abut against the second installation groove 105;

[0029] After the bar stock is fixed on the chuck 101, start the motor 103 installed inside the lathe to rotate the chuck 101, and the bar stock can be rotated to be cut by the tool into a valve stem;

[0030] When a rotating bar stock is cut by a cutting tool, the cutting tool slowly approaches the chuck 101, and at the same time, the second hydraulic cylinder 301 slowly retracts the slider 302. While the slider 302 retracts, the arc-shaped roller 404 slides in the fixed ring 402 by means of the ball 403, so that the second push block 306 can continuously clamp the bar stock by means of the arc-shaped roller 404 when the slider 302 retracts, so that the cutting position of the cutting tool will not be too far from the clamped position of the bar stock, so as to reduce the probability of the bar stock bending. And because the contact surfaces of the anti-slip strip 205 and the arc-shaped roller 404 that contact the bar stock during the clamping process are all curved surfaces that fit the bar stock, the bar stock is clamped more firmly, and the damping effects of the first shock absorber 203 and the second shock absorber 305 are also more significant.

[0031] Through the above steps, a sliding clamping device is set up so that when the bar stock that rotates after being clamped is cut by the cutting tool, the distance between the clamping point and the cutting point of the bar stock remains unchanged, so as to reduce the elastic deformation caused by the cutting force to the valve stem with a relatively large slenderness ratio and relatively low self-rigidity, and even cause plastic deformation, and further reduce the possibility of the valve stem bending.

[0032] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A clamping device for valve internals processing, comprising a turntable assembly (1); characterized in that: It also includes a side fixing component (2), an upper and lower fixing component (3), and a rolling fixing component (4); a side fixing component (2) for fixing both ends of the bar stock is installed inside the turntable component (1); an upper and lower fixing component (3) for fixing the upper and lower ends of the bar stock is arranged at the upper and lower ends of the side fixing component (2); and a rolling fixing component (4) for cooperating with the upper and lower fixing component (3) to prevent the bar stock from deforming is arranged inside the upper and lower fixing component (3).

2. The clamping device for machining valve internals according to claim 1, characterized in that: The turntable component (1) includes a chuck (101), a connecting block (102), a motor (103), a first installation groove (104), and a second installation groove (105); the rear end of the chuck (101) is fixedly connected to the connecting block (102); the connecting block (102) is rotationally connected to the motor (103) through a connecting shaft and a coupling; a first installation groove (104) is formed inside the chuck (101); and the upper and lower ends of the first installation groove (104) are provided with a second installation groove (105).

3. A clamping device for machining valve internals according to claim 2, characterized in that: The side fixing component (2) includes a first hydraulic cylinder (201), a first sliding sleeve (202), a first shock absorber (203), a first pushing block (204), and an anti-slip strip (205); first hydraulic cylinders (201) are fixedly connected to both sides inside the first installation groove (104); a first sliding sleeve (202) is fixedly connected to the first hydraulic cylinder (201); a first shock absorber (203) is fixedly connected inside the first sliding sleeve (202); one end of the first shock absorber (203) is fixedly connected to a first pushing block (204) that is slidably connected to the first sliding sleeve (202); and an anti-slip strip (205) is fixedly connected to the first pushing block (204).

4. A clamping device for machining valve internals according to claim 2, characterized in that: The upper and lower fixing component (3) includes a second hydraulic cylinder (301), a slider (302), a third hydraulic cylinder (303), a second sliding sleeve (304), a second shock absorber (305), and a second pushing block (306); second hydraulic cylinders (301) are fixedly connected to the upper and lower ends inside the second installation groove (105); the front end of the second hydraulic cylinder (301) is fixedly connected to a slider (302) that is slidably connected to the second installation groove (105); and a third hydraulic cylinder (303) is fixedly connected inside the slider (302).

5. The clamping device for valve internals machining according to claim 4, wherein: A second sliding sleeve (304) is fixedly connected to the third hydraulic cylinder (303); a second shock absorber (305) is fixedly connected inside the second sliding sleeve (304); and one end of the second shock absorber (305) is fixedly connected to a second pushing block (306) that is slidably connected to the second sliding sleeve (304).

6. The clamping device for machining valve internals according to claim 5, characterized in that: The rolling fixing component (4) includes a third installation groove (401), a fixing ring (402), a ball (403), and an arc-shaped roller (404); a third installation groove (401) is formed inside the second pushing block (306); and two fixing rings (402) are fixedly connected inside the third installation groove (401).

7. A clamping device for machining valve internals according to claim 5, characterized in that: Several balls (403) are embedded in the fixing ring (402); and an arc-shaped roller (404) is rotatably connected to the fixing ring (402).

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