Positioning clamp

Abstract

The utility model discloses a locating fixture, relates to the fixture field, including U-shaped seat, the inside upper position of U-shaped seat is rotatingly equipped with trapezoidal screw rod, and inside lower position of U-shaped seat is fixedly equipped with guide rod, one end of trapezoidal screw rod passes through U-shaped seat one side wall and is fixedly connected with knob, and the other end of trapezoidal screw rod passes through U-shaped seat one side wall and is fixedly connected with the knob. And a single-acting air cylinder is fixedly mounted on the other side wall of the U-shaped seat and located between the trapezoidal screw rod and the guide rod. According to the positioning clamp, the stability of the assembling quality of a linear sliding rail can be effectively improved, unstable factors existing in the assembling process due to manual operation are eliminated, the assembling quality of the sliding rail is guaranteed, meanwhile, operation convenience and low cost are taken into account, and the positioning clamp is suitable for popularization and application. The positioning requirements of different environments can be met within the movable range of the first guide rail positioning block and the second guide rail positioning block, the linear guide rail can be corrected by controlling the single-acting air cylinder to work, and functionality is better.

Description

Technical Field

[0001] The utility model relates to the field of clamps, in particular to a positioning clamp. Background Art

[0002] Currently, when the dimensional tolerances of the workpieces meet the standards, it is common practice to install the linear slides by locating them on one side. When installing the linear slides in this way, a constant thrust needs to be applied on the other side of the slide to push the guide rail against the locating surface. When the straightness accuracy requirements for the slide installation are not high, manually pressing the guide rail against the edge can usually meet the needs. When high precision is required, a special positioning and locating tool is required to ensure that the slide rail fits tightly against the locating edge. The conventional method is to design a special assembly tool to meet the requirements of the linear guide rail's edge installation, but this special tool has poor compatibility.

[0003] Furthermore, when high-precision straightness is required, even edge-mounted linear guides may not fully achieve the desired straightness. Microscopic bends may occur in certain locations, resulting in poor overall straightness. In this case, varying edge pressures are required to correct the guide curve. Conventional assembly tooling cannot quantify the clamping force, relying solely on the assembler's experience, resulting in a relatively long commissioning time.

[0004] This device uses a pneumatic structure to achieve the quantification and adjustment of the clamping force at a relatively low cost. At the same time, it has a self-locking adjustable positioning structure that can adapt to guide rails with different positioning spacings and has a certain degree of compatibility. Utility Model Content

[0005] The main purpose of the present utility model is to provide a positioning fixture that can effectively solve the technical problem in the background technology that when high-precision straightness is required, the linear guide rail sometimes cannot fully meet the required straightness even if it is installed against the edge, and the guide rail in some positions may be bent at a microscopic level, resulting in poor overall straightness.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A positioning fixture comprises a U-shaped seat, wherein a trapezoidal screw is rotatably installed at the upper position on the inner side of the U-shaped seat, and a guide rod is fixedly installed at the lower position on the inner side of the U-shaped seat, one end of the trapezoidal screw passes through one side wall of the U-shaped seat and is fixedly connected to a knob, and the other side wall of the U-shaped seat is located between the trapezoidal screw and the guide rod and a single-acting cylinder is fixedly installed thereon, a fixed-side movable block is provided between the trapezoidal screw and the guide rod, a first guide rail positioning block is fixedly installed on the bottom of the fixed-side movable block, the outside of the guide rod is slidably connected to a cylinder push block, and a second guide rail positioning block is fixedly installed on the bottom of the cylinder push block.

[0008] As a further solution of the present invention, a hand valve is fixedly installed on the upper part of the U-shaped seat, and the input end of the hand valve passes through the U-shaped seat and is fixedly connected to an air intake pipe, and a conduit is connected between the output end of the hand valve and the single-acting cylinder.

[0009] As a further solution of the present invention, the first guide rail positioning block and the second guide rail positioning block have the same structure and are mirror-imaged.

[0010] As a further solution of the present invention, a screw nut is fixedly installed on one side of the fixed-side movable block outside the trapezoidal screw, and the screw nut is threadedly connected to the trapezoidal screw.

[0011] As a further solution of the present invention, the cylinder push block is fixedly connected to the output shaft of the single-acting cylinder.

[0012] The beneficial effects of the utility model are as follows:

[0013] The positioning fixture designed by the utility model can effectively improve the stability of the assembly quality of the linear guide rail and eliminate the unstable factors in the assembly process due to manual operation. The device takes into account the convenience of operation and low cost while ensuring the assembly quality of the guide rail. It can also adapt to the positioning requirements of different environments within the movable range of the first guide rail positioning block and the second guide rail positioning block, and can also perform linear guide rail correction work by controlling the operation of the single-acting cylinder, with better functionality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of a positioning fixture of the utility model;

[0015] Figure 2 This is a front view of a positioning fixture of the utility model;

[0016] Figure 3 This is a side view of a positioning fixture of the present utility model;

[0017] Figure 4 This is a working demonstration diagram of a positioning fixture of the utility model.

[0018] In the figure: 1. U-shaped seat; 2. Trapezoidal screw; 3. Guide rod; 4. Knob; 5. Single-acting cylinder; 6. Hand valve; 7. Inlet pipe; 8. Conduit; 9. Fixed side movable block; 10. First guide rail positioning block; 11. Cylinder push block; 12. Second guide rail positioning block. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] like Figure 1-Figure 4 As shown, a positioning fixture includes a U-shaped seat 1, a trapezoidal screw rod 2 is rotatably installed on the upper inner side of the U-shaped seat 1, and a guide rod 3 is fixedly installed on the lower inner side of the U-shaped seat 1, one end of the trapezoidal screw rod 2 passes through one side wall of the U-shaped seat 1 and is fixedly connected to a knob 4, the other side wall of the U-shaped seat 1 is located between the trapezoidal screw rod 2 and the guide rod 3 and is fixedly installed with a single-acting cylinder 5, a fixed side movable block 9 is provided between the trapezoidal screw rod 2 and the guide rod 3, a first guide rail positioning block 10 is fixedly installed on the bottom of the fixed side movable block 9, the outside of the guide rod 3 is slidably connected to a cylinder push block 11, and a second guide rail positioning block 12 is fixedly installed on the bottom of the cylinder push block 11.

[0021] In this embodiment, a hand valve 6 is fixedly mounted on the upper portion of the U-shaped seat 1, and the input end of the hand valve 6 passes through the U-shaped seat 1 and is fixedly connected to an air intake pipe 7, and a conduit 8 is connected between the output end of the hand valve 6 and the single-acting cylinder 5;

[0022] Connect the external air source to the air inlet pipe 7, and then control the operation of the single-acting cylinder 5 through the hand valve 6 and the conduit 8.

[0023] In this embodiment, the first guide rail positioning block 10 and the second guide rail positioning block 12 have the same structure and are mirror-imaged;

[0024] The first guide rail positioning block 10 and the second guide rail positioning block 12 are used to cooperate with each other to clamp Figure 4 The position indicated in the figure can be used to correct the linear guide.

[0025] In this embodiment, a screw nut is fixedly installed on one side of the fixed side movable block 9 outside the trapezoidal screw rod 2, and the screw nut is threadedly connected to the trapezoidal screw rod 2;

[0026] The screw nut is used to cooperate with the trapezoidal screw 2 to drive the fixed edge movable block 9 to move, which is convenient for different usage situations. At the same time, since the trapezoidal screw itself has a self-locking function, when the linear guide rail is corrected, the clamping force is not greater than the self-locking force of the trapezoidal screw, the self-locking function after position adjustment can be realized.

[0027] In this embodiment, the cylinder push block 11 is fixedly connected to the output shaft of the single-acting cylinder 5;

[0028] The single-acting cylinder 5 cooperates with the cylinder push block 11 to realize the clamping function on the one hand, and on the other hand, the single-acting cylinder 5 can provide a constant thrust.

[0029] It should be noted that the present invention is a positioning fixture. When in use, first, manually adjust the first guide rail positioning block 10 and the fixed side movable block 9 to a suitable spacing through the knob 4, and then clamp them. Figure 4The first guide rail positioning block 10 does not apply thrust to the guide rail. Then the control hand valve 6 is opened to ventilate the single-acting cylinder 5. The single-acting cylinder 5 pushes the cylinder push block 11, and the cylinder push block 11 drives the second guide rail positioning block 12, providing a constant thrust to fix the slide rail. Since the trapezoidal lead screw 2 has a self-locking feature, the fixed side movable block 9 will not move due to the reaction force when the clamping force is applied, thereby ensuring the stability of the thrust.

[0030] When it is detected that the straightness of the guide rail installation is poor in some positions, this tooling can be used to correct it. Loosen the guide rail screws at the corresponding positions, and after fixing the guide rail in the same way as above, the air pressure supplied to the single-acting cylinder 5 can be adjusted through the hand valve 6 to achieve a change in the cylinder thrust. By changing the cylinder thrust, the local force on the guide rail at that position is changed, thereby correcting the poor straightness at the local position.

[0031] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements shall fall within the scope of the present invention as claimed.

Claims

1. A positioning fixture, comprising a U-shaped seat (1), characterized in that: A trapezoidal screw rod (2) is rotatably mounted on the upper inner side of the U-shaped seat (1), and a guide rod (3) is fixedly mounted on the lower inner side of the U-shaped seat (1). One end of the trapezoidal screw rod (2) passes through a side wall of the U-shaped seat (1) and is fixedly connected to a knob (4). A single-acting cylinder (5) is fixedly mounted on the other side wall of the U-shaped seat (1) between the trapezoidal screw rod (2) and the guide rod (3). A fixed side movable block (9) is provided between the trapezoidal screw rod (2) and the guide rod (3). A first guide rail positioning block (10) is fixedly mounted on the bottom of the fixed side movable block (9). A cylinder push block (11) is slidably connected to the outside of the guide rod (3). A second guide rail positioning block (12) is fixedly mounted on the bottom of the cylinder push block (11).

2. A positioning fixture according to claim 1, characterized in that: A hand valve (6) is fixedly mounted on the upper portion of the U-shaped seat (1), and an input end of the hand valve (6) passes through the U-shaped seat (1) and is fixedly connected to an air intake pipe (7), while a conduit (8) is connected between the output end of the hand valve (6) and the single-acting cylinder (5).

3. A positioning fixture according to claim 1, characterized in that: The first guide rail positioning block (10) and the second guide rail positioning block (12) have the same structure and are arranged in a mirror image.

4. A positioning fixture according to claim 1, characterized in that: One side of the fixed side movable block (9) is located outside the trapezoidal lead screw (2) and is fixedly mounted with a lead screw nut, which is threadably connected to the trapezoidal lead screw (2).

5. The positioning fixture according to claim 1, characterized in that: The cylinder push block (11) is fixedly connected to the output shaft of the single-acting cylinder (5).

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