Positioning clamp

Abstract

The utility model discloses a positioning clamp which comprises a bottom plate, a positioning adjusting stud, a magnet and a positioning pin. A first screw hole is formed in one end part of the bottom plate, and a second screw hole is formed in the other end part; the lower part of the positioning adjusting stud is screwed with the first screw hole and is adjustable in height, the upper part of the positioning adjusting stud is a polished rod, the middle part of the polished rod is provided with a supporting step, the upper end part of the polished rod can extend into the first pin hole of the workpiece, and the supporting step can support one end part of the workpiece; the center of the magnet is provided with a through hole, the upper end of the positioning pin is provided with a positioning boss, and the rod part is provided with external threads; the magnet is attracted to the bottom plate, the through hole corresponds to the second screw hole, the rod portion of the positioning pin penetrates through the through hole to be in threaded connection with the second screw hole, the positioning boss can stretch into the second pin hole of the workpiece, and the magnet can attract and support the other end of the workpiece. The special-shaped workpiece clamping device can be used for quickly clamping the special-shaped workpiece with an inclined assembly surface, so that the clamping time is shortened, and the workpiece is prevented from being aligned.

Description

Technical Field

[0001] The utility model belongs to the field of tooling fixtures, and in particular relates to a positioning fixture. Background Art

[0002] Special-shaped workpieces with inclined assembly surfaces require suitable spacers and pressure plates for clamping and pressing during inspection. This is inefficient, difficult to clamp, time-consuming, and requires high operator skill, resulting in low inspection efficiency. To improve positioning accuracy, ensure inspection efficiency, and protect the workpiece, a fast positioning fixture is urgently needed to meet the requirements of multi-part inspection and clamping of special-shaped workpieces with inclined assembly surfaces, including planes, center holes, pin holes, and position accuracy. Utility Model Content

[0003] The utility model aims to provide a positioning fixture for clamping a special-shaped workpiece whose assembly surface is an inclined surface, thereby shortening the clamping time and avoiding the need for workpiece alignment.

[0004] The positioning fixture described in the utility model includes a base plate, a positioning adjustment stud, a magnet and a positioning pin; a first screw hole is opened at one end of the base plate, and a second screw hole is opened at the other end; the lower part of the positioning adjustment stud is screwed with the first screw hole and the screw connection is height-adjustable, the upper part of the positioning adjustment stud is a polished rod, the middle part of the polished rod has a supporting step, the upper end of the polished rod can be extended into the first pin hole of the workpiece, and the supporting step can support one end of the workpiece; a through hole is opened at the center of the magnet, the upper end of the positioning pin has a positioning boss, and the rod has an external thread; the magnet is adsorbed on the base plate, the through hole corresponds to the second screw hole, the rod of the positioning pin passes through the through hole and is screwed with the second screw hole, the positioning boss can be extended into the second pin hole of the workpiece, and the magnet can attract and support the other end of the workpiece.

[0005] When positioning the workpiece, the upper end of the polished rod extends into the first pin hole of the workpiece and fits in with the gap of the first pin hole. One end of the workpiece is supported on the supporting step, the magnet attracts the workpiece, and the positioning boss extends into the second pin hole of the workpiece and fits in with the gap of the second pin hole. The other end of the workpiece is supported on the magnet, thereby realizing the positioning and fixation of the workpiece.

[0006] Preferably, the supporting step is cylindrical, and the side wall of the supporting step is integrally formed with friction patterns, which increase the friction force when screwing the positioning adjustment stud, thereby saving effort when screwing.

[0007] Preferably, the supporting step is in the shape of a hexagonal prism, which is convenient for tightening the positioning adjustment stud with a wrench.

[0008] Preferably, the side wall of the positioning boss has two mutually parallel planes, so that the clamping and tightening of the rod portion of the positioning pin and the second screw hole when being screwed together are more convenient and more labor-saving.

[0009] Preferably, the length of the upper end of the polished rod extending into the first pin hole of the workpiece (also the length of the upper end of the polished rod) is one-fifth of the depth of the first pin hole, which not only ensures positioning stability (that is, the workpiece will not easily fall off from the upper end of the polished rod), but also avoids the upper end of the polished rod extending too deeply into the first pin hole and affecting the detection of the first pin hole.

[0010] Preferably, the length of the positioning boss extending into the second pin hole of the workpiece is one tenth of the depth of the second pin hole. Due to the fixation with a magnet, the length of the positioning boss extending into the second pin hole of the workpiece can be slightly shorter, which not only ensures the positioning stability (that is, the workpiece will not easily fall off the positioning boss), but also avoids the positioning boss affecting the detection of the second pin hole due to extending too deep into the second pin hole.

[0011] This utility model can clamp special-shaped workpieces with inclined assembly surfaces. It uses positioning adjustment studs and positioning pins to quickly position the workpieces, and uses magnets to quickly fix the workpieces. This reduces the technical requirements for the operator, shortens the clamping time, avoids workpiece alignment, and makes replacing and loading workpieces quick and convenient. It is very suitable for the inspection and clamping needs of planes, center holes, pin holes, position accuracy, and other parts of special-shaped workpieces with inclined assembly surfaces, which can improve inspection efficiency. In addition, for workpieces with different height differences, the screw connection height of the positioning adjustment studs can be adjusted, which makes adjustment easy, simple to operate, and has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the positioning fixture in an embodiment of the present utility model.

[0013] Figure 2 It is a cross-sectional view of the bottom plate in an embodiment of the present utility model.

[0014] Figure 3 It is a structural schematic diagram of the positioning and adjusting stud in an embodiment of the present utility model.

[0015] Figure 4 This is a schematic diagram of the cooperation between the positioning pin and the magnet in the embodiment of the present utility model.

[0016] Figure 5 It is a top view of the positioning pin in the embodiment of the present utility model.

[0017] Figure 6 This is a structural schematic diagram of a workpiece mounted on a positioning fixture in an embodiment of the present utility model.

[0018] Figure 7 for Figure 6 Top view of . DETAILED DESCRIPTION

[0019] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference only and are not intended to limit the embodiments of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0021] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0022] like Figures 1 to 7 As shown, the positioning fixture in the embodiment of the present invention is used to position and fix a special-shaped workpiece (blank) with an inclined assembly surface. One end of the workpiece 5 is provided with a first pin hole 51 passing through it from top to bottom, and the other end of the workpiece 5 is provided with a second pin hole 52 passing through it from top to bottom. The lower surface of the workpiece 5 is an inclined surface with a height difference.

[0023] The positioning fixture includes a base plate 1, a positioning adjustment stud 2, a magnet 3, and a positioning pin 4. A first screw hole 11 is provided at one end of the base plate 1, and a second screw hole 2 is provided at the other end. The lower portion of the positioning adjustment stud 2 is screwed to the first screw hole 11, and the screw connection height is adjustable. The upper portion of the positioning adjustment stud 2 is a polished rod, and the middle portion of the polished rod has a support step 21. The upper end of the polished rod can extend into the first pin hole 51, and the support step 21 can support one end of the workpiece 5. A through hole 31 is provided in the center of the magnet 3, and a positioning boss 41 is provided at the upper end of the positioning pin 4. The rod portion of the positioning pin 4 has an external thread, and the diameter of the positioning boss 41 is larger than the diameter of the through hole 31. The magnet 3 is adsorbed on the base plate 1, the through hole 31 corresponds to the second screw hole 12, the rod of the positioning pin 4 passes through the through hole 31 and is screwed to the second screw hole 12, the positioning boss 41 is pressed and adsorbed on the magnet 3, the positioning boss 41 can extend into the second pin hole 52, and the magnet 3 can adsorb and support the other end of the workpiece 5.

[0024] In some embodiments, the support step 21 is cylindrical, and the side wall of the support step 21 is integrally formed with friction lines (see Figure 3 ), the friction pattern can increase the friction force when screwing the positioning adjustment stud 2, thereby saving effort when screwing.

[0025] In some embodiments, the support step 21 is in the shape of a hexagonal prism, which facilitates the use of a wrench to tighten the positioning adjustment stud.

[0026] In some embodiments, the side wall of the positioning boss 41 has two parallel planes 411 , which makes it more convenient and labor-saving to clamp and tighten the rod of the positioning pin 4 and the second screw hole 52 when they are screwed together.

[0027] In some embodiments, the length of the upper end of the polished rod extending into the first pin hole 51 is one-fifth of the depth of the first pin hole 51, which can ensure positioning stability (i.e., the workpiece 5 will not easily fall off the upper end of the polished rod) and prevent the upper end of the polished rod from extending too deeply into the first pin hole 51 and affecting the detection of the first pin hole 51.

[0028] In some embodiments, the length of the positioning boss 41 extending into the second pin hole 52 is one tenth of the depth of the second pin hole 52. Since it is fixed with the magnet 3, the length of the positioning boss 41 extending into the second pin hole 52 can be slightly shorter. This can not only ensure the positioning stability (that is, the workpiece 5 will not easily fall off the positioning boss 41), but also avoid the positioning boss 41 affecting the detection of the second pin hole 52 due to extending too deep into the second pin hole 52.

[0029] like Figure 6 、 Figure 7 As shown, the positioning fixture is placed on the testing instrument platform. When positioning the workpiece 5, the height of the positioning adjustment stud 2 screwed into the first screw hole 11 is adjusted according to the height difference of the workpiece 5's inclined surface, so that the height difference between the upper end surface of the support step 21 and the lower end surface of the positioning boss 41 (corresponding to the upper surface of the magnet 3) is equal to the height difference of the workpiece 5's inclined surface. The workpiece 5 is then placed on the positioning fixture, and the upper end of the polished rod is inserted into the first pin hole 51, with a clearance fit therebetween. One end of the workpiece 5 is supported on the supporting step 21, and the magnet 3 attracts the workpiece 5. The positioning boss 41 is inserted into the second pin hole 52, with a clearance fit therebetween, and the other end of the workpiece 5 is supported on the magnet 3, thereby achieving positioning and securing of the workpiece 5. The positioning adjustment stud 2 and the positioning pin 4 are used to quickly position the workpiece 5, and the magnet 3 is used to quickly secure the workpiece 5. No pressure plate is required to compress the workpiece 5, which reduces the operator's technical requirements, shortens the clamping time, and avoids workpiece alignment. When the workpiece 5 needs to be removed after the inspection, the workpiece 5 can be directly removed upward from the upper end of the polished rod and the positioning boss 41, which makes replacement and assembly quick and convenient.

[0030] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A positioning fixture, characterized in that: The invention comprises a base plate (1), a positioning adjustment stud (2), a magnet (3) and a positioning pin (4); a first screw hole (11) is provided at one end of the base plate (1) and a second screw hole (12) is provided at the other end; the lower portion of the positioning adjustment stud (2) is screwed to the first screw hole (11) and is height-adjustable; the upper portion of the positioning adjustment stud (2) is a polished rod, the middle portion of the polished rod has a support step (21), the upper end of the polished rod can extend into the first pin hole (51) of the workpiece (5), and the support step (21) can support the workpiece (5); a through hole (31) is provided at the center of the magnet (3); the upper end of the positioning pin (4) has a positioning boss (41) and the rod has an external thread; the magnet (3) is adsorbed on the bottom plate (1), the through hole (31) corresponds to the second screw hole (12), the rod of the positioning pin (4) passes through the through hole (31) and is screwed to the second screw hole (12), the positioning boss (41) can extend into the second pin hole (52) of the workpiece (5), and the magnet (3) can adsorb and support the other end of the workpiece (5).

2. The positioning fixture according to claim 1, characterized in that: The supporting step (21) is cylindrical, and its side wall is integrally formed with friction lines.

3. The positioning fixture according to claim 1, characterized in that: The supporting step (21) is in the shape of a hexagonal prism.

4. The positioning fixture according to claim 1, characterized in that: The side wall of the positioning boss (41) has two mutually parallel planes (411).

5. The positioning fixture according to any one of claims 1 to 4, characterized in that: The length of the upper end of the polished rod extending into the first pin hole (51) of the workpiece (5) is one fifth of the depth of the first pin hole (51).

6. The positioning fixture according to claim 5, characterized in that: The length of the positioning boss (41) extending into the second pin hole (52) of the workpiece (5) is one tenth of the depth of the second pin hole (52).

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