Clamp for clamping workpiece

Abstract

A clamp used for clamping a workpiece comprises two oppositely arranged clamping pieces and a driving mechanism capable of at least driving one of the two clamping pieces to move relative to the other clamping piece, and is characterized in that each of the two clamping pieces comprises a base, a connecting rod and a plurality of sliding blocks used for abutting against the side face of the workpiece; wherein the base is provided with a concave part which allows the plurality of sliding blocks to be located at the same time and allows the sliding blocks to slide in the moving direction of the clamping piece, each sliding block is provided with a long hole extending in the sliding direction of the sliding block, and the connecting rod penetrates through the long hole in each sliding block and then is supported on the two side walls of the concave part. And a locking piece capable of locking the plurality of sliding blocks on the base is arranged. Due to the fact that a pure mechanical structure is adopted for clamping the workpiece, the clamping strength is large, the service life is long, clamping is stable, the sliding stroke of the sliding block can meet the clamping requirements of too large and too small workpieces, and the clamp is wide in application range and can better meet the clamping requirements of existing workpieces, especially special-shaped workpieces.

Description

Technical Field

[0001] The utility model relates to the technical field of a fixture, in particular to a fixture mainly used for clamping special-shaped workpieces. Background Technique

[0002] A fixture is a device used to quickly, conveniently and safely fix a workpiece. Under the clamping of the fixture, machining such as milling and drilling can be carried out on the surface of the workpiece. Traditional fixtures usually use bench vises, and the clamping of the workpiece is realized by the relative movement of the mutually parallel clamping surfaces on the bench vise. Obviously, for workpieces with flat sides, such a fixture can achieve the purpose of reliable clamping. However, when the side of the workpiece is an irregular surface, the clamping surface of the bench vise only contacts the side with the maximum spacing, that is, only a partial side of the workpiece is clamped. Therefore, the workpiece is prone to looseness during the machining process, thus affecting the machining accuracy. For this reason, fixtures for clamping special-shaped workpieces have been designed. For example, a document with the Chinese patent application publication number CN219853378U discloses a special-shaped fixture. The special-shaped fixture includes a horizontally arranged base and two clamping devices symmetrically arranged on the base. The symmetry plane of the two clamping devices is perpendicular to the base, and this symmetry plane is plane A. Each clamping device includes a horizontally arranged rectangular closed oil tank and a number of ejector rods vertically and slidably connected through the tank wall corresponding to plane A. The ejector rods are all in sealed cooperation with the oil tank. A valve is provided on the oil tank, and hydraulic oil is filled in the oil tank. The oil tank of one clamping device is fixedly connected to the base, and a nut is fixedly arranged at the bottom of the oil tank of the other clamping device. A lead screw perpendicular to plane A is threadedly connected through the nut, and a rotating device for driving the lead screw to rotate is provided on the base. When in use, by moving one clamping device relative to the other clamping device, each ejector rod can abut against the side of the special-shaped workpiece and compress the spring, and the excess hydraulic oil in the oil tank flows into the hydraulic oil tank through the valve.

[0003] In addition, documents such as the Chinese patent authorization announcement number CN216858996U and the Chinese patent authorization announcement number CN214685337U also disclose similar fixtures for clamping special-shaped workpieces.

[0004] However, looking at the existing fixtures for special-shaped workpieces, springs are present in the fixtures. Therefore, the stroke of the ejector rods is limited, making it impossible to clamp workpieces that are too large or too small, thus having the defect of limited application range. At the same time, the clamping strength and stability also need to be further improved. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a fixture for clamping workpieces with a wide application range and good clamping strength in view of the current situation of the prior art.

[0006] The technical solution adopted by the present utility model to solve the above technical problems is as follows: A fixture for clamping a workpiece, comprising two oppositely arranged clamping members and a driving mechanism capable of driving at least one of the two clamping members to move relative to the other clamping member. The characteristics are as follows: The two clamping members both include a base, a connecting rod, and a plurality of sliding blocks for abutting against the side surface of the workpiece. Among them, the base is provided with a recess for the plurality of sliding blocks to be located simultaneously and allowing each sliding block to slide along the moving direction of the clamping member. Each sliding block is provided with a long hole extending along the sliding direction of the sliding block. The connecting rod passes through the long holes of each sliding block and is supported on the two side walls of the recess, and a locking member is provided to lock the plurality of sliding blocks to the base.

[0007] In the above solution, preferably, the connecting rod is a screw rod having external threads at least at the ends, and the locking member is a first cushion block located in the recess and sleeved on the connecting rod. In this way, by rotating the connecting rod and using the elastic restoring force of the first cushion block, each sliding block is made to be in close contact with each other to achieve positioning.

[0008] In the above preferred solution, a further improvement is that a first screw hole threadedly connected to the connecting rod is opened on one of the two side walls, and a second screw hole communicating with the first screw hole is opened at the top of this side wall. A second cushion block in contact with the connecting rod and a set screw threadedly connected to the second screw hole and capable of abutting against the second cushion block are placed in the second screw hole. With the aid of the set screw, the second cushion block presses the connecting rod to prevent it from rotating after being accidentally stressed.

[0009] Preferably, there are two connecting rods, which are arranged at intervals along the sliding direction of the sliding block to improve the sliding stability of each sliding block.

[0010] In the above solutions, a top plate located above the plurality of sliding blocks can also be fixed between the two side walls. A plurality of set screw holes corresponding to the number of the plurality of sliding blocks are opened on the top plate. Locking screws with ends capable of abutting against the surfaces of the corresponding sliding blocks are connected in each set screw hole. Each locking screw forms the locking member, that is, by rotating each locking screw, the positioning of the sliding block can be conveniently and quickly realized.

[0011] In the above solutions, a further improvement is that a positioning block protruding outward from the sliding block is fixed on the abutting end of each sliding block facing the workpiece. The positioning blocks on the sliding blocks of the two clamping members together form a base for placing the workpiece, which helps to place the workpiece and improve the machining accuracy of the workpiece.

[0012] In the above improvement scheme, a positioning groove is formed at the abutting end of each sliding block, and the positioning block is a T-shaped member partially inserted into the positioning groove. Alternatively, the positioning block is a vertical strip fixed to the abutting end of the sliding block. Preferably, a wear-resistant pad is provided on the top surface of the strip to protect the surface of the workpiece.

[0013] Compared with the prior art, in the clamping member of the present utility model, each sliding block can be limited in the concave portion of the base through a connecting rod, and after sliding as required, it abuts against the side surface of the workpiece, and then can be positioned through a locking position. Obviously, the present utility model uses a pure mechanical structure to clamp the workpiece, so the clamping strength is large, the service life is long, the clamping is stable, and since the sliding stroke of the sliding block can meet the clamping requirements of workpieces of too large or too small sizes, such a fixture has a wide application range and can better meet the clamping requirements of existing workpieces, especially special-shaped workpieces. Brief Description of the Drawings

[0014] Figure 1 Stereoscopic schematic diagram of the first embodiment of the present utility model (when clamping a special-shaped workpiece);

[0015] Figure 2 is Figure 1 Stereoscopic exploded view of (removing some structures of the special-shaped workpiece and the bench vice);

[0016] Figure 3 Stereoscopic schematic diagram of the clamping member in the second embodiment of the present utility model;

[0017] Figure 4 is Figure 3 Stereoscopic exploded view of;

[0018] Figure 5 is Figure 1 Stereoscopic schematic diagram when clamping a workpiece with a regular side surface. Detailed Description of the Specific Embodiment

[0019] The present utility model will be further described in detail below in conjunction with the embodiments of the drawings.

[0020] In the description of the following embodiments, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "axial direction", "circumferential direction", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the disclosed embodiments of the present invention can be arranged in different directions, these terms indicating directions should only be regarded as illustrative and not restrictive. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0021] As Figure 1 and Figure 2 shown, this fixture is used to clamp a workpiece. Figure 1 The workpiece A in

[0022] is an irregular shaped workpiece. This fixture includes two oppositely arranged clamping members 10 and a driving mechanism 20 that can drive one of the two clamping members to move relative to the other clamping member. In the figure, the two clamping members 10 are respectively placed on two clamping seats 30 of an existing bench vise, and the driving mechanism 20 uses a screw-nut pair on the bench vise. Of course, according to needs, the driving mechanism can also be one that can drive the two clamping members 10 to move simultaneously, so as to move relatively or in opposite directions, that is, move closer to each other or move away from each other. At this time, there are two threads with opposite helix directions on the screw. Since it is prior art, it will not be elaborated further. Figure 4However, preferably, a first screw hole 12 threadedly connected to the connecting rod 2 is formed in one of the two side walls. One end of the connecting rod 2 has a limiting portion, and the other end passes through the long hole 31 and is threadedly connected to the first screw hole 12. After fastening, in order to prevent the connecting rod 2 from being accidentally stressed and rotated to cause loosening, a second screw hole 13 communicating with the first screw hole 12 is further formed at the top of the side wall. A second cushion block 4 in contact with the connecting rod 2 and a set screw 5 threadedly connected to the second screw hole and capable of abutting against the second cushion block are placed in the second screw hole 13. By using the set screw 5, the second cushion block 4 is abutted tightly against the connecting rod 2, thereby effectively preventing the accidental rotation of the connecting rod 2.

[0023] In order to reliably position the sliding block 3 after it moves into place, in this embodiment, a locking member is provided to lock the plurality of sliding blocks 3 to the base 1. Figure 1 and Figure 2 As shown in, the locking member is a first cushion block 6 located in the recess 11 and sleeved on the connecting rod. After the connecting rod 2 is tightened, the elastic restoring force of the first cushion block 6 can be used to tightly press the sliding blocks 3 against each other.

[0024] In order to further improve the positioning stability of the sliding blocks 3, a top plate 7 is further fixed between the two side walls and above the sliding blocks 3. A plurality of set screw holes 71 corresponding to the number of the plurality of sliding blocks 3 are formed in the top plate 7. Locking screws 8 with ends abutting against the upper surfaces of the corresponding sliding blocks 3 are connected in the set screw holes 71. The locking screws 8 and the first cushion block 6 together form the locking member. Of course, the sliding blocks 3 can also be locked only by the locking screws 8 (please refer to Figure 3 and Figure 4 ).

[0025] In order to improve the machining accuracy, a positioning block 9 protruding outward from the sliding block 3 is fixed on the abutting end of each sliding block 3 facing the workpiece. The positioning blocks 9 on the sliding blocks 3 of the two clamping members together form a base for placing the workpiece. In this way, by improving the top surface accuracy of the positioning block, the error after the workpiece is placed can be reduced. Compared with directly placing the workpiece on the vise, it is beneficial to improve the machining accuracy.

[0026] Figure 1 and Figure 2 In, a positioning groove 32 is formed at the abutting end of each sliding block 3, and the positioning block 9 is a T-shaped member partially inserted into the positioning groove. It is also possible to adopt Figure 3 and Figure 4 The positioning block in, that is, the positioning block 9 is designed as a vertical strip fixed to the abutting end of the sliding block 3. At this time, a wear-resistant pad 91 can be provided on the top surface of the strip to prevent the surface of the workpiece from being damaged.

[0027] During use, the two clamping members 10 are respectively fixed to the clamping seat 30 of the bench vice by bolts. Loosen the locking screws and connecting rods on each clamping member, then move the sliding blocks 3 on the left clamping member so that the special-shaped workpiece can be placed on the positioning block of the left clamping member and abutted against the abutting end of the corresponding sliding block 3. Then, tighten the connecting rod and each locking screw on the left clamping member. Next, operate the driving mechanism to move Figure 1 the clamping member on the right in the Figure 1 towards the clamping member on the left until the abutting ends of the sliding blocks on the right clamping member abut against the right side surface of the special-shaped workpiece. Then, tighten the connecting rods and locking screws on the right clamping member, and subsequent processing of the special-shaped workpiece can be carried out.

[0028] In addition to the above embodiments, those skilled in the art can also understand that this fixture can also clamp workpieces with regular sides, such as Figure 5 shown.

Claims

1. A clamp for clamping a workpiece, comprising two clamping members (10) arranged opposite to each other and a driving mechanism (20) capable of driving at least one of the two clamping members to move relative to the other clamping member, characterized in that: The two clamping members each comprise a base (1), a connecting rod (2) and a plurality of sliding blocks (3) for supporting the side surfaces of a workpiece, wherein the base (1) is provided with a recess (11) for the plurality of sliding blocks (3) to be seated simultaneously and for allowing each sliding block (3) to slide along the moving direction of the clamping member, each sliding block (3) is provided with a long hole (31) extending along the sliding direction of the sliding block (3), the connecting rod (2) passes through the long hole (31) on each sliding block (3) and is supported on two side walls of the recess (11), and a locking member is provided for locking the plurality of sliding blocks (3) to the base (1).

2. The clamp according to claim 1, characterized in that: The connecting rod (2) is a screw rod having an external thread at least at the end thereof, and the locking element is a first cushion block (6) located in the recess (11) and sleeved on the connecting rod (2).

3. The clamp according to claim 2, characterized in that: A first screw hole (12) threadedly connected to the connecting rod (2) is formed on one of the two side walls, and a second screw hole (13) connected to the first screw hole and extending through the first screw hole is formed on the top of the side wall. A second cushion block (4) in contact with the connecting rod (2) and a set screw (5) threadedly connected to the second screw hole (13) and capable of abutting against the second cushion block (4) are placed in the second screw hole (13).

4. The clamp according to claim 2, characterized in that: There are two connecting rods (2), which are arranged at intervals along the sliding direction of the sliding block (3).

5. The clamp according to claim 1, characterized in that: A top plate (7) located above the plurality of sliding blocks (3) is fixed between the two side walls, a plurality of fixing screw holes (71) corresponding to the number of the plurality of sliding blocks (3) are opened on the top plate (7), and a locking screw (8) whose end can abut against the surface of the corresponding sliding block (3) is connected to each fixing screw hole (71), and each locking screw (8) forms the locking member.

6. The clamp according to any one of claims 1 to 5, characterized in that: Each of the sliding blocks (3) is fixed with a positioning block (9) protruding from the sliding block (3) at the top holding end facing the workpiece. The positioning blocks on each sliding block (3) of the two clamping members together form a base for placing the workpiece.

7. The clamp according to claim 6, characterized in that: A positioning groove (32) is formed at the top holding end of each sliding block (3), and the positioning block (9) is a T-shaped piece partially inserted into the positioning groove.

8. The clamp according to claim 6, characterized in that: The positioning block (9) is an upright strip-shaped body fixed on the top holding end of the sliding block (3).

9. The clamp according to claim 8, characterized in that: A wear-resistant pad (91) is provided on the top surface of the strip-shaped body.

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