Bidirectional clamping mechanism for rotary table of numerical control machine tool

Abstract

The utility model discloses a bidirectional clamping mechanism for a rotary table of a numerical control machine tool. The bidirectional clamping mechanism comprises an oil cylinder seat arranged on a base of the rotary table and an oil cylinder arranged on the oil cylinder seat, a plurality of mounting holes are formed in the opposite positions of the upper end face and the lower end face of the oil cylinder. A through hole is formed between the upper mounting hole and the lower mounting hole, so that the two mounting holes are communicated; a through oil hole is further formed in the oil cylinder; the plurality of through holes are communicated through the oil holes; and pistons are mounted in the mounting holes. The two-way clamping device has the advantages that two-way clamping can be carried out, the clamping effect is good, the stress of the oil cylinder is balanced, the service life of the oil cylinder and the oil cylinder seat can be effectively prolonged, and the disassembly and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control machine tools, in particular to a bidirectional clamping mechanism for a rotary table of a numerical control machine tool. Background Art

[0002] The rotary table of a CNC boring and milling machine is used to carry the workpiece to be processed. When processing different surfaces of the workpiece, the rotary table needs to be rotated to the working angle to meet the processing requirements of different surfaces of the workpiece. Since the shape of the workpiece to be processed may be irregular, its center of gravity is not necessarily in the exact center of the worktable, and there is an eccentricity phenomenon. There is a torque on the rotation center of the worktable caused by the workpiece, which can easily cause the workpiece and the worktable to tip over. In order to prevent the workpiece from tipping over, a clamping mechanism needs to be set on the worktable to lock the worktable. The traditional cylinder piston clamping mechanism can only clamp on one side. The cylinder is subjected to the reaction force of the clamping force, and has a tendency to move upward and rebound or produce plastic deformation. The clamping effect is not good, which can easily cause damage to the cylinder and the cylinder seat, and the disassembly and maintenance costs are high. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a bidirectional clamping mechanism for a rotary table of a CNC machine tool, which can perform bidirectional clamping, has good clamping effect, and balances the force of the cylinder, can effectively extend the service life of the cylinder and the cylinder seat, and reduce the cost of disassembly and maintenance.

[0004] In order to solve the above technical problems, the technical solution of the utility model is a bidirectional clamping mechanism for a rotary table of a CNC machine tool, comprising a cylinder seat installed on a worktable base and a cylinder installed on the cylinder seat; a plurality of mounting holes are provided at relative positions of the upper and lower end faces of the cylinder; a through hole is provided between the upper and lower mounting holes to connect the two mounting holes; a penetrating oil hole is also provided on the cylinder; the oil hole connects a plurality of through holes; and pistons are installed in the plurality of mounting holes.

[0005] Furthermore, a piston oil seal is installed in each of the installation holes; the piston oil seal is cylindrical and is located on a side of the piston close to the oil hole.

[0006] Furthermore, the piston oil seal is made of a flexible material.

[0007] Furthermore, friction plates are installed on both upper and lower end surfaces of the oil cylinder; one end of the friction plate close to the oil cylinder seat is fixedly connected to the oil cylinder, and the other end away from the oil cylinder seat is in contact with the piston.

[0008] Furthermore, both upper and lower end surfaces of the oil cylinder are installed with pressure strips; one end of the pressure strip is used to install the friction plate on the oil cylinder through screws, and the other end of the pressure strip is provided with an avoidance groove on one side close to the oil cylinder.

[0009] Furthermore, the bottom of the oil cylinder seat is installed on the top of the adjustment pad; the adjustment pad is fixedly connected to the workbench base.

[0010] Furthermore, the adjustment pad is integrally connected to the workbench base.

[0011] Furthermore, a step for supporting the oil cylinder is provided on the side of the oil cylinder seat that contacts the oil cylinder.

[0012] Beneficial effects of the utility model:

[0013] The present application improves the structure of the traditional oil cylinder by setting upper and lower mounting holes, each of which is equipped with a piston. When clamping is required, oil enters the oil cylinder from the external oil circuit and then enters the through hole through the oil hole, and pushes the upper and lower opposite pistons to move toward the upper and lower clamping surfaces of the rotary table to perform the clamping action. The utility model has a simple structure, can perform bidirectional clamping of the upper and lower clamping surfaces, has a good clamping effect, and the oil cylinder is subjected to balanced force, which can effectively extend the service life of the oil cylinder and the oil cylinder seat and reduce the cost of disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the embodiment installed on a rotary workbench;

[0015] Figure 2 It is a schematic diagram of the overall structure of the embodiment;

[0016] Figure 3 for Figure 1 A cross-sectional view of the clamping mechanism;

[0017] Figure 4 for Figure 3 Cross-sectional view of the middle oil cylinder;

[0018] Figure 5 for Figure 4 Cross-sectional view of the middle cylinder from the other direction.

[0019] In the figure, 1-cylinder seat, 2-cylinder, 201-mounting hole, 202-through hole, 203-oil hole, 3-rotating worktable, 4-worktable base, 5-pressure strip, 6-piston, 7-piston oil seal, 8-adjusting pad, 9-friction plate, 10-step. DETAILED DESCRIPTION

[0020] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Example

[0022] A bidirectional clamping mechanism for a rotary table of a CNC machine tool, such as Figure 1-5 As shown; it includes a cylinder seat 1 installed on a workbench base 4, and a cylinder 2 installed on the cylinder seat 1; a plurality of mounting holes 201 are provided at opposite positions of the upper and lower end faces of the cylinder 2; a through hole 202 is provided between the upper and lower mounting holes 201 to connect the two mounting holes 201; a penetrating oil hole 203 is also provided on the cylinder 2; the oil hole 203 connects the plurality of through holes 202; and pistons 6 are installed in the plurality of mounting holes 201.

[0023] The above-mentioned bidirectional clamping mechanism of the rotary table of the CNC machine tool improves the structure of the traditional oil cylinder 2 by setting upper and lower opposite mounting holes 201, and a piston 6 is installed in each mounting hole 201. When clamping is required, the oil enters the oil cylinder 2 from the external oil circuit, enters the through hole 202 through the oil 203, and pushes the upper and lower opposite pistons 6 to move toward the upper and lower clamping surfaces of the rotary table 3 respectively to perform a clamping action, thereby realizing bidirectional clamping, having a good clamping effect, and balancing the force of the oil cylinder. It can effectively extend the service life of the oil cylinder 2 and the cylinder seat 1, and reduce the cost of disassembly and maintenance.

[0024] Specifically, in order to prevent oil from leaking from the gaps around the piston 6 , a piston oil seal 7 is installed in each mounting hole 201 ; the piston oil seal 7 is cylindrical and is located on a side of the piston 6 close to the oil hole 203 .

[0025] Specifically, the piston oil seal 7 is made of a flexible material. In this embodiment, the piston oil seal 7 is made of rubber. When clamping is required, the oil enters the oil cylinder 2 from the external oil circuit, enters the through hole 202 through the oil hole 203, and pushes the upper and lower relative piston oil seals 7 to move, and the side walls of the piston oil seals 7 expand and deform outward under the action of the oil pressure, playing a good sealing role. At the same time, the movement of the piston oil seal 7 pushes the upper and lower pistons 6 to move toward the upper and lower clamping surfaces of the rotary table 3 respectively to perform a clamping action.

[0026] After a period of use, the brake components will inevitably wear out and need to be replaced regularly. In order to facilitate replacement and reduce the cost of disassembly and maintenance, a friction plate 9 is installed on the top of the piston 6. Specifically, the upper and lower end surfaces of the oil cylinder 2 are both installed with friction plates 9; the end of the friction plate 9 close to the oil cylinder seat 1 is fixedly connected to the oil cylinder 2, and the end away from the oil cylinder seat 1 is in contact with the piston 6. In this embodiment, the material of the friction plate 9 is spring steel. When braking, the oil enters the oil cylinder 2 from the external oil circuit, enters the through hole 202 through the oil hole 203, and pushes the upper and lower relative piston oil seals 7 to move, and the side walls of the piston oil seals 7 expand and deform outward under the action of oil pressure, playing a good sealing role. At the same time, the movement of the piston oil seal 7 pushes the upper and lower pistons 6 to move toward the upper and lower clamping surfaces of the rotary table 3 respectively, and the piston 6 pushes the friction plate 9. After the friction plate 9 is elastically deformed, it abuts against the upper and lower clamping surfaces of the rotary table 3 to clamp the rotary table 3.

[0027] Specifically, a pressure strip 5 is installed on both the upper and lower end surfaces of the oil cylinder 2; one end of the pressure strip 5 is used to install the friction plate 9 on the oil cylinder 2 by screws, and the other end of the pressure strip 5 is provided with an escape groove on the side close to the oil cylinder 2. When clamping, the friction plate 9 is elastically deformed toward the clamping surface of the rotary table 3 under the extrusion of the piston 6, and the escape groove provides space for the bending deformation of the friction plate 9.

[0028] Specifically, the bottom of the oil cylinder seat 1 is installed on the top of the adjustment pad 8; the adjustment pad 8 is fixedly connected to the workbench base 4. The surface flatness of the workbench base 4 is not high, and the adjustment pad 8 is arranged and the upper end surface of the adjustment pad 8 is processed to ensure the flatness of the surface of the adjustment pad 8, which can improve the installation accuracy of the oil cylinder seat 1.

[0029] Specifically, the adjustment pad 8 is integrally connected to the workbench base 4. In this embodiment, the adjustment pad 8 is integrally connected to the workbench base 4 by casting.

[0030] Furthermore, a step 10 for supporting the oil cylinder 2 is provided on the side of the oil cylinder seat 1 in contact with the oil cylinder 2. The step 10 plays a positioning role on the one hand, and plays a certain supporting role on the other hand.

[0031] The working principle of this utility model:

[0032] When braking, the hydraulic oil enters the oil cylinder 2 from the external oil circuit, enters the through hole 202 through the oil hole 203, and pushes the upper and lower piston oil seals 7 to move, and the side walls of the piston oil seals 7 expand and deform outward under the action of the oil pressure, playing a good sealing role. At the same time, the piston oil seal 7 moves to push the upper and lower pistons 6 to move toward the upper and lower clamping surfaces of the rotary table 3 respectively, and the piston 6 pushes the friction plate 9. After the friction plate 9 is elastically deformed, it abuts against the upper and lower clamping surfaces of the rotary table 3 to clamp the rotary table 3. The utility model has a simple structure, can perform bidirectional clamping of the upper and lower clamping surfaces, has a good clamping effect, and the oil cylinder 2 is subjected to balanced force, which can effectively extend the service life of the oil cylinder 2 and the oil cylinder seat 1 and reduce the cost of disassembly and maintenance.

[0033] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A bidirectional clamping mechanism for a rotary table of a numerically controlled machine tool, comprising a cylinder seat (1) mounted on a table base (4), and a cylinder (2) mounted on the cylinder seat (1); characterized in that: The upper and lower end surfaces of the oil cylinder (2) are provided with a plurality of mounting holes (201) at positions opposite to each other; a through hole (202) is provided between the upper and lower mounting holes (201) to connect the two mounting holes (201); the oil cylinder (2) is also provided with a penetrating oil hole (203); the oil hole (203) connects the plurality of through holes (202); and pistons (6) are installed in the plurality of mounting holes (201).

2. The bidirectional clamping mechanism for the rotary table of a CNC machine tool according to claim 1, characterized in that: A piston oil seal (7) is installed in each installation hole (201); the piston oil seal (7) is cylindrical and is located on a side of the piston (6) close to the oil hole (203).

3. The bidirectional clamping mechanism for the rotary table of a CNC machine tool according to claim 2, characterized in that: The piston oil seal (7) is made of a flexible material.

4. The bidirectional clamping mechanism for the rotary table of a CNC machine tool according to any one of claims 1 to 3, characterized in that: Friction plates (9) are installed on both upper and lower end surfaces of the oil cylinder (2); the end of the friction plate (9) close to the oil cylinder seat (1) is fixedly connected to the oil cylinder (2), and the end away from the oil cylinder seat (1) is in contact with the piston (6).

5. The bidirectional clamping mechanism for the rotary table of a CNC machine tool according to claim 4, characterized in that: The upper and lower end surfaces of the oil cylinder (2) are both installed with pressure strips (5); one end of the pressure strip (5) is used to install the friction plate (9) on the oil cylinder (2) by means of screws, and the other end of the pressure strip (5) is provided with an avoidance groove on a side close to the oil cylinder (2).

6. The bidirectional clamping mechanism for a rotary table of a CNC machine tool according to claim 1, characterized in that: The bottom of the oil cylinder seat (1) is installed on the top of the adjustment pad (8); the adjustment pad (8) is fixedly connected to the workbench base (4).

7. The bidirectional clamping mechanism for the rotary table of a CNC machine tool according to claim 6, characterized in that: The adjustment pad (8) is integrally connected to the workbench base (4).

8. The bidirectional clamping mechanism for a rotary table of a CNC machine tool according to claim 1, characterized in that: A step (10) for supporting the oil cylinder (2) is provided on the side of the oil cylinder seat (1) that contacts the oil cylinder (2).

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