Part machining jig pre-positioning and jacking mechanism

Abstract

The utility model relates to a pre-positioning and jacking mechanism of a part processing jig, which comprises a base, two first positioning convex nails arranged on the base and used for positioning the bottom surface of a workpiece, and a limiting block arranged on the base and positioned beside the first positioning convex nails, a limiting block is arranged on the base, a second positioning protruding nail used for positioning the side face of the first end of a workpiece is arranged on the side face of the limiting block, a V-shaped supporting block is arranged on the base, two third positioning protruding nails used for limiting the side face of the second end of the workpiece are arranged on the V-shaped supporting block, and an elastic positioning pin is arranged at the position, opposite to the second positioning protruding nail, of the base. The front end of the elastic positioning pin abuts against a workpiece, and the rear end of the elastic positioning pin is connected with a hydraulic cylinder so as to drive the elastic positioning pin to abut against the workpiece. An air cylinder is further arranged on the base. The pre-positioning and jacking mechanism of the part machining jig is reasonable in design, pre-positioning and jacking of a workpiece can be guaranteed, defective products caused by not-in-place clamping are avoided, and the yield of products is improved.

Description

Technical Field:

[0002] The utility model relates to a pre-positioning and pressing mechanism for a component processing fixture. Background Art:

[0004] There are many types of automotive components, and most of them are irregular products. The design of processing fixtures is relatively complex. It is difficult to clamp workpieces, or the workpieces cannot be positioned after clamping, which requires special attention by workers. Otherwise, defective products are easily produced.

[0005] For example, in the Chinese patent "Workpiece Clamping Fixture" with the publication number CN209304408U, it includes a bracket, a linear slide rail installed on the bracket, two sliding blocks slidably installed on the linear slide rail, two driving parts installed on the bracket, and two clamping blocks detachably installed on the two sliding blocks respectively. The two driving parts are respectively connected to the two sliding blocks and drive the two sliding blocks to slide on the linear slide rail. Positioning parts corresponding to the shape of the workpiece are respectively formed on the clamping blocks and are respectively installed on opposite sides of the two sliding blocks, so that the positioning parts of the two clamping blocks are opposite to each other to form a clamping area for clamping the workpiece between the two clamping blocks. Although this patent can be used to clamp different types of workpieces and has a wide applicability, it cannot pre-position special-shaped workpieces, resulting in inaccurate clamping and easy production of defective products. Summary of the Invention:

[0007] In view of the above problems, the purpose of the utility model is to provide a pre-positioning and pressing mechanism for a component processing fixture. The pre-positioning and pressing mechanism for the component processing fixture is reasonably designed, which can ensure pre-positioning and pressing of the workpiece, avoid defective products caused by improper clamping, and improve the yield rate of products.

[0008] The pre-positioning and pressing mechanism for the component processing fixture of the utility model is characterized in that it includes a base, two first positioning studs arranged on the base for positioning the bottom surface of the workpiece, and a limiting block arranged on the base beside the first positioning studs. A second positioning stud for positioning the side surface of the first end of the workpiece is arranged on the side surface of the limiting block. A V-shaped supporting block is arranged on the base, and two third positioning studs for limiting the side surface of the second end of the workpiece are arranged on the V-shaped supporting block. An elastic positioning pin is arranged on the base at a position opposite to the second positioning stud, the front end of the elastic positioning pin abuts against the workpiece, and the rear end of the elastic positioning pin is connected to a hydraulic cylinder to drive the elastic positioning pin to press tightly against the workpiece; several air cylinders for pressing on the upper surface of the workpiece are also arranged on the base.

[0009] Preferably, there are three cylinders as described above. The cylinder blocks of the three cylinders are fixed on the base, and the telescopic rods of the three cylinders move vertically upward. A pressing arm is fixedly connected to the upper end of the telescopic rod of the cylinder. The free ends of the pressing arms connected to two of the cylinders respectively face the first positioning protrusions, and the free end of the pressing arm connected to the other cylinder faces the V-shaped groove of the V-shaped support block.

[0010] Preferably, a pressing block for pressing the workpiece is installed at the lower part of the free end of the pressing arm as described above.

[0011] Preferably, a slider is fixedly connected to the free end of the telescopic rod of the hydraulic cylinder as described above, and the elastic positioning pin as described above is installed in the slider.

[0012] Preferably, a stepped inner cavity for accommodating the stepped elastic positioning pin is provided in the slider as described above. The end of the elastic positioning pin passes through the through hole on the stepped inner cavity and out of the slider. A spring for pushing the elastic positioning pin is provided in the stepped inner cavity so that the elastic positioning pin cooperates with the first positioning protrusion to pre-tighten the workpiece.

[0013] Preferably, the two third positioning protrusions are respectively installed on both sides of the notch position of the V-shaped groove as described above, and the two third positioning protrusions are arranged coaxially and oppositely.

[0014] For the using method of the pre-positioning and top-tightening mechanism of the jig for machining parts of the present utility model, the second end of the workpiece is inserted into the V-shaped support block, and both sides of the second end abut against the ends of the third positioning protrusions. The bottom surface of the workpiece is supported on the two first positioning protrusions. And manually push the elastic positioning pin first, and insert the workpiece into the space between the elastic positioning pin and the second positioning protrusion to realize the pre-positioning and top-tightening of the workpiece. Then the hydraulic cylinder and the cylinder work to realize the pressing of the side and the upper surface of the workpiece, and realize the positioning and clamping of the workpiece during machining.

[0015] The pre-positioning and top-tightening mechanism of the jig for machining parts of the present utility model is reasonably designed, which can ensure the pre-positioning and top-tightening of the workpiece, avoid defective products caused by improper clamping, and improve the yield rate of the product. Description of the Drawings:

[0017] The present utility model will be further described below in conjunction with the drawings;

[0018] Figure 1 is a perspective view of the present utility model (the workpiece, the pressing arm and the pressing block of one cylinder are omitted);

[0019] Figure 2 is a perspective view of the present utility model in the using state;

[0020] Figure 3 is a sectional view of the slider, the hydraulic cylinder, etc. Detailed Embodiment:

[0022] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] The pre-positioning and clamping mechanism for the parts processing fixture of the present utility model includes a base 1, two first positioning studs 2 arranged on the base 1 for positioning the bottom surface of the workpiece, and a limit block 3 arranged on the base beside the first positioning studs 2. A second positioning stud 4 for positioning the side surface of the first end of the workpiece is arranged on the side surface of the limit block 3. The base is a flat plate, and the first positioning stud 2 is a rectangular block, on which pointed conical positioning cones are arranged in an array; the limit block 3 is locked on the base by screws, and the second positioning stud 4 arranged on the side surface of the limit block 3 is also the same as the first positioning stud, that is, a rectangular block, on which pointed conical positioning cones are arranged in an array.

[0024] A V-shaped support block 5 is arranged on the base 1. Two third positioning studs 6 for limiting the side surface of the second end of the workpiece are arranged on the V-shaped support block 5. The V-shaped groove of the V-shaped support block 5 positions the bottom surface of the second end of the workpiece; specifically, the two third positioning studs are respectively installed on both sides of the notch position of the V-shaped groove, and the two third positioning studs are coaxially opposite to each other, and the two third positioning studs are coaxially placed against the side surface of the second end of the workpiece.

[0025] An elastic positioning pin 7 is arranged on the base 1 at a position opposite to the second positioning stud 4. The front end of the elastic positioning pin 7 abuts against the workpiece K, and the rear end of the elastic positioning pin 7 is connected to a hydraulic cylinder 8. The elastic positioning pin 7 has elasticity relative to the hydraulic cylinder and is pushed under the action of an external force, that is, the relative distance between the elastic positioning pin 7 and the second positioning stud 4 is less than the width of the workpiece. Thus, after the workpiece is placed between the elastic positioning pin 7 and the second positioning stud 4, the workpiece is pushed and pressed; several air cylinders 9 for pressing on the upper surface of the workpiece are also arranged on the base 1. The air cylinder 9 can directly press the workpiece with the telescopic rod or press the workpiece through an intermediate component.

[0026] Specifically, there are three air cylinders as described above. The cylinder bodies of the three air cylinders are fixed on the base, and the telescopic rods of the three air cylinders move up and down vertically. A pressing arm 10 is fixedly connected to the upper end of the telescopic rod of the air cylinder. The free ends of the pressing arms connected by two of the air cylinders respectively face the first positioning stud 2, and the free end of the pressing arm connected by the other air cylinder faces the V-shaped groove of the V-shaped support block 5. A pressing block 11 for pressing the workpiece is installed at the lower part of the free end of the pressing arm 10. The upper end of the telescopic rod of the air cylinder has a stepped screw rod, and the upper end of the stepped screw rod passes through the tail of the pressing arm and is locked and fixed with a nut.

[0027] For reasonable design, a slider 12 is fixedly connected to the free end of the telescopic rod of the hydraulic cylinder. The elastic positioning pin 7 is installed inside the slider. A chute 15 is arranged on the slider 12, and a screw 16 installed on the base is arranged in the chute, and the screw cooperates with the chute for limiting sliding.

[0028] Among them, a stepped inner cavity 13 for accommodating a stepped elastic positioning pin is provided in the slider 12. The end of the elastic positioning pin passes through a through hole on the stepped inner cavity 13 to the outside of the slider. A spring 14 for pushing the elastic positioning pin is provided in the stepped inner cavity, so that the elastic positioning pin cooperates with the first positioning stud to pre-tighten the workpiece. The free end of the telescopic rod of the hydraulic cylinder 8 is fixedly connected to the slider. When the hydraulic cylinder works, it can push the slider to slide, and the elastic positioning pin 7 can expand and contract relative to the slider and the hydraulic cylinder.

[0029] The using method of the pre-positioning and top-tightening mechanism of the jig for machining parts of the present utility model is as follows: the first end of the workpiece is inserted into the V-shaped support block, and both sides of the first end are abutted against the ends of the third positioning studs. The bottom surface of the workpiece is supported on two first positioning studs. And manually first push the elastic positioning pin, and make the workpiece be inserted into the space between the elastic positioning pin and the second positioning stud to realize the pre-positioning and top-tightening of the workpiece. Then the hydraulic cylinder and the air cylinder work to realize the pressing of the side part and the upper surface of the workpiece, and realize the positioning and clamping of the workpiece during machining.

[0030] The pre-positioning and top-tightening mechanism of the jig for machining parts of the present utility model is reasonably designed, which can ensure the pre-positioning and top-tightening of the workpiece, avoid defective products caused by improper clamping, and improve the yield rate of the product.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them; although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still modifications can be made to the specific embodiments of the present utility model or equivalent replacements can be made to some technical features; without departing from the spirit of the technical solutions of the present utility model, they should all be covered within the scope of the technical solutions claimed by the present utility model.

Claims

1. A pre-positioning and clamping mechanism for a component processing fixture, characterized in that: It includes a base, two first positioning studs arranged on the base for positioning the bottom surface of the workpiece, and a limiting block arranged on the base beside the first positioning studs. A second positioning stud for positioning the side surface of the first end of the workpiece is arranged on the side surface of the limiting block. A V-shaped support block is arranged on the base, and two third positioning studs for limiting the side surface of the second end of the workpiece are arranged on the V-shaped support block. An elastic positioning pin is arranged on the base at a position opposite to the second positioning stud. The front end of the elastic positioning pin abuts against the workpiece, and the rear end of the elastic positioning pin is connected to a hydraulic cylinder to drive the elastic positioning pin to tightly press the workpiece; several air cylinders for pressing on the upper surface of the workpiece are also arranged on the base.

2. The pre-positioning and clamping mechanism for the parts processing fixture according to claim 1, wherein: There are three air cylinders. The cylinder bodies of the three air cylinders are fixed on the base, and the telescopic rods of the three air cylinders vertically move upward. A pressing arm is fixedly connected to the upper end of the telescopic rod of the air cylinder. The free ends of the pressing arms connected to two of the air cylinders respectively face the first positioning studs, and the free end of the pressing arm connected to the other air cylinder faces the V-shaped groove of the V-shaped support block.

3. The pre-positioning and clamping mechanism for component processing fixture according to claim 2, wherein: A pressing block for pressing the workpiece is installed at the lower part of the free end of the pressing arm.

4. The pre-positioning and clamping mechanism for the component processing fixture according to claim 2 or 3, characterized in that: The free end of the telescopic rod of the hydraulic cylinder is fixedly connected with a slider, and the elastic positioning pin is installed in the slider.

5. The pre-positioning and clamping mechanism for component processing fixtures according to claim 4, characterized in that: A stepped inner cavity for accommodating the stepped elastic positioning pin is arranged in the slider. The end of the elastic positioning pin passes through the through hole on the stepped inner cavity and extends out of the slider. A spring for pushing the elastic positioning pin is arranged in the stepped inner cavity so that the elastic positioning pin cooperates with the first positioning stud to pre-tightly press the workpiece.

6. The pre-positioning and clamping mechanism for component processing fixtures according to claim 5, characterized in that: The two third positioning studs are respectively installed on both sides of the notch position of the V-shaped groove, and the two third positioning studs are coaxially and oppositely arranged.

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