Zero-point positioning clamp device

Abstract

The utility model discloses a zero-point positioning clamp device which comprises a clamp tool and a quick-change structure. The quick-change structure comprises a mother board, a daughter board and a plurality of zero-point positioning units, the mother board is fixed to a workbench of a machine tool, and the daughter board is installed on the mother board through the zero-point positioning units. The clamp tool comprises a bottom plate, a support, a jacking mechanism, a coarse positioning plate, a positioning pin, a pressing mechanism and a rotation restraining mechanism. The bottom plate is arranged on the sub-plate, the positioning pin and the at least three jacking mechanisms are arranged on the bottom plate, the support is arranged on the bottom plate, and the rotation restraining mechanism and the pressing mechanism opposite to the jacking mechanisms are arranged on the support; the coarse positioning plate is fixed on the bottom plate and / or the support, the coarse positioning plate is arranged along the contour of the workpiece, and one side, facing the workpiece, of the coarse positioning plate is provided with a chamfer or a fillet; the jacking mechanism is used for positioning and supporting a workpiece in the vertical direction perpendicular to the bottom plate, the pressing mechanism is used for pressing the workpiece on the jacking mechanism, the positioning pin is used for positioning the workpiece in the horizontal direction perpendicular to the vertical direction, and the rotation restraining mechanism is used for restraining rotation of the workpiece in the vertical direction. On the premise that the workpiece clamping precision is ensured, the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of jigs, in particular to a zero-point positioning jig device. Background Art

[0002] In the traditional machining process, the clamping operation of workpieces is usually carried out on the machine tool. This process takes a long time, resulting in reduced production efficiency and difficulty in meeting the needs of large-scale production. Currently, it is gradually adopted to pre-clamp the workpiece on the fixture, and then the fixture holding the workpiece is hoisted onto the machine tool as a whole for machining. This method can reduce the idle time of the machine tool, but since the process of positioning the workpiece on the fixture takes a long time and the fixture needs to spend time re-positioning every time it is hoisted onto the machine tool, the production efficiency is still not high. Summary of the Invention

[0003] The utility model provides a zero-point positioning jig device to improve the production efficiency on the premise of ensuring the clamping accuracy of the workpiece.

[0004] To achieve the above purpose, the technical solution of the utility model is as follows:

[0005] A zero-point positioning jig device includes: a jig fixture and a quick-change structure;

[0006] The quick-change structure includes a mother board, a daughter board and a plurality of zero-point positioning units. The mother board is fixed on the workbench of the machine tool, and the daughter board is installed on the mother board through the zero-point positioning units;

[0007] The jig fixture includes a bottom plate, a support, a lifting mechanism, a rough positioning plate, a positioning pin, a pressing mechanism and a rotation restraint mechanism;

[0008] The bottom plate is arranged on the daughter board. The positioning pin and at least three lifting mechanisms are arranged on the bottom plate. The support is arranged on the bottom plate. The rotation restraint mechanism and the pressing mechanism arranged opposite to the lifting mechanism are arranged on the support;

[0009] The rough positioning plate is fixed on the bottom plate and / or the support. The rough positioning plate is arranged along the contour of the workpiece, and a chamfer or a fillet is arranged on the side of the rough positioning plate facing the workpiece;

[0010] The lifting mechanism is used to position and support the workpiece in the vertical direction perpendicular to the bottom plate. The pressing mechanism is used to press the workpiece onto the lifting mechanism. The positioning pin is used to position the workpiece in the horizontal direction perpendicular to the vertical direction. The rotation restraint mechanism is used to restrain the rotation of the workpiece around the vertical direction.

[0011] Further, the support includes a first support and a second support which are oppositely arranged, and the rotation restraint mechanism includes a first locking mechanism and a second locking mechanism;

[0012] The first locking mechanism includes a first bolt and a locking nut. The first bolt is threadedly connected to the first support, and the locking nut is sleeved on the first bolt. By screwing the first bolt, the head of the first bolt can abut against the workpiece;

[0013] A threaded hole is formed in the second support. The second locking mechanism includes an adjusting bolt, a pin with a head, a return spring and a mounting block. The axis of the pin with a head is parallel to the axis of the first bolt;

[0014] The mounting block is fixed on the second support. A through hole is formed in the mounting block. A cavity communicating with the threaded hole and the through hole is formed between the second support and the mounting block. The adjusting bolt is installed in the threaded hole, the pin with a head is inserted into the through hole, the pin with a head can slide along the through hole, the head of the pin with a head is arranged in the cavity, and the return spring is arranged in the cavity and sleeved on the pin with a head;

[0015] By tightening the adjusting bolt, the adjusting bolt pushes the head of the pin with a head close to the workpiece so that the pin with a head abuts against the workpiece. By loosening the adjusting bolt, the return spring drives the pin with a head to reset.

[0016] Further, the pressing mechanism is a pressing plate assembly. The pressing plate assembly includes a top rod, a pressing screw, a pressing nut and a pressing plate. The top rod and the pressing screw are fixed on the support. The pressing nut is sleeved on the pressing screw. The pressing plate is located between the pressing nut and the support. The pressing plate is movably sleeved on the pressing screw. One end of the pressing plate abuts against the top end of the top rod, and the other end of the pressing plate can press the workpiece.

[0017] Further, the pressing plate assembly further includes a spring. The spring is sleeved on the pressing screw and is located between the pressing plate and the support.

[0018] Further, the pressing mechanism is a holding device. The holding device includes a second support rod, a second connecting rod and a pressing bolt. The second support rod is vertically arranged on the support. One end of the second connecting rod is rotatably connected to the second support rod, and the other end of the second connecting rod is threadedly connected to the pressing bolt;

[0019] By rotating the second connecting rod, the projection of the second connecting rod in the vertical direction can be non-overlapped or overlapped with the projection of the workpiece in the vertical direction;

[0020] When the projection of the second connecting rod in the vertical direction overlaps with the projection of the workpiece in the vertical direction, by screwing the compression bolt, the head of the compression bolt can press the workpiece.

[0021] Further, an auxiliary positioning device is further included. The auxiliary positioning device includes a first support rod, a first connecting rod, and a pressing head. The first support rod is vertically arranged on the support. One end of the first connecting rod is rotatably connected to the first support rod, and the other end of the first connecting rod is fixedly connected to the pressing head.

[0022] By rotating the first connecting rod, the projection of the first connecting rod in the vertical direction can be made non-overlapping or overlapping with the projection of the workpiece in the vertical direction.

[0023] When the projection of the first connecting rod in the vertical direction overlaps with the projection of the workpiece in the vertical direction, the jacking mechanism jacks up the workpiece, and the pressing head can press the workpiece.

[0024] Further, the jacking mechanism is a screw jack.

[0025] Beneficial effects:

[0026] A zero-point positioning fixture device provided by the present utility model preliminarily positions the workpiece through a rough positioning plate, so as to quickly guide and position the workpiece to the fixture tooling, reducing the time for the workpiece to be positioned on the tooling; by setting a rotation constraint mechanism, the rotation of the workpiece around the vertical direction is constrained, and cooperating with the jacking mechanism and positioning pins that can position the workpiece in the vertical and horizontal directions, precise positioning of the workpiece is achieved, thereby ensuring the position accuracy of each clamping. The workpiece is pressed onto the jacking mechanism through the pressing mechanism to ensure that the workpiece is reliably clamped on the fixture tooling; the fixture tooling is fixed on the sub-plate, and the sub-plate and the mother plate fixed on the workbench are quickly positioned through the zero-point positioning unit, so as to reduce the time consumed for positioning the fixture tooling after it is hoisted onto the machine tool. Description of the drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of a zero-point positioning fixture device for clamping a workpiece disclosed by the present utility model.

[0029] Figure 2Schematic diagram of the structure for clamping a workpiece after removing the quick-change structure of a zero-point positioning fixture device disclosed by the present utility model;

[0030] Figure 3 Schematic diagram of the structure of a zero-point positioning fixture device disclosed by the present utility model after removing the quick-change structure;

[0031] Figure 4 Top view schematic diagram of a zero-point positioning fixture device disclosed by the present utility model after removing the quick-change structure;

[0032] Figure 5 is Figure 4 D-D sectional view of;

[0033] Figure 6 is Figure 4 B-B sectional view of;

[0034] Figure 7 is Figure 4 C-C sectional view of;

[0035] Figure 8 Schematic diagram of the sectioning of the pressing device of a zero-point positioning fixture device disclosed by the present utility model.

[0036] In the figure:

[0037] 1, mother board; 2, daughter board; 3, bottom board; 4, workbench; 5, jacking mechanism; 6, rough positioning plate; 7, positioning pin; 8, first support; 9, second support; 10, first bolt; 11, locking nut; 12, adjusting bolt; 13, headed pin shaft; 14, return spring; 15, mounting block; 16, pressing screw; 17, pressing plate nut; 18, pressing plate; 19, first support rod; 20, first connecting rod; 21, pressing head; 22, spring; 23, second support rod; 24, second connecting rod; 25, pressing bolt; 26, ejector rod; 27, positioning pin mounting seat; 28, limit bolt; 29, rotating part; A, workpiece. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0039] This embodiment provides a zero-point positioning fixture device, including: a fixture tooling and a quick-change structure;

[0040] AsFigure 1 As shown, the quick-change structure includes a mother board 1, a daughter board 2, and a plurality of zero-point positioning units. The mother board 1 is fixed on the workbench 4 of the machine tool by bolts, and the daughter board 2 is installed on the mother board 1 through the zero-point positioning units;

[0041] As Figures 2 to 7 shown, the fixture tooling includes a bottom plate 3, a support, a lifting mechanism 5, a rough positioning plate 6, a positioning pin 7, a pressing mechanism, and a rotation restraint mechanism;

[0042] The bottom plate 3 is fixed on the daughter board 2 by bolts. The positioning pin 7 and at least three lifting mechanisms 5 are arranged on the bottom plate 3. The lifting mechanisms 5 are fixed on the bottom plate 3 by bolts. The support is fixed on the bottom plate 3 by bolts. The rotation restraint mechanism and the pressing mechanism arranged opposite to the lifting mechanism 5 are arranged on the support. In this embodiment, it further includes a positioning pin mounting seat 27 fixed on the bottom plate 3 by bolts, and the positioning pin 7 is fixed on the positioning pin mounting seat 27 by bolts;

[0043] In this embodiment, as Figure 4 shown, four lifting mechanisms 5 are arranged on the bottom plate 3, and four pressing mechanisms are arranged opposite to the four lifting mechanisms 5. The lifting mechanisms 5 are used to support the four corners of the workpiece A and adjust the heights of the four corners of the workpiece A to ensure the positioning of the workpiece A in the vertical direction;

[0044] The rough positioning plate 6 is fixed on the bottom plate 3 and / or the support by bolts. The rough positioning plate 6 is arranged along the contour of the workpiece A. A chamfer or fillet is provided on the side of the rough positioning plate 6 facing the workpiece A to play a role of guiding and positioning during the process of placing the workpiece A on the fixture tooling;

[0045] The specific setting of the rough positioning plate 6 depends on the shape of the workpiece A. In this embodiment, two rough positioning plates 6 are provided on the bottom plate 3 for rough positioning the middle part of the workpiece A, and four rough positioning plates 6 are provided on the support for rough positioning the four corners of the workpiece A;

[0046] The lifting mechanism 5 is used to position and support the workpiece A in the vertical direction perpendicular to the bottom plate 3. The pressing mechanism is used to press the workpiece A on the lifting mechanism 5. The positioning pin 7 is used to position the workpiece A in the horizontal direction perpendicular to the vertical direction. The rotation restraint mechanism is used to restrain the rotation of the workpiece A around the vertical direction;

[0047] A zero-point positioning fixture device provided in this embodiment preliminarily positions the workpiece A through the rough positioning plate 6, facilitating the rapid guiding and positioning of the workpiece A onto the fixture tooling and reducing the time for the workpiece A to be positioned on the tooling. Since the positioning pin 7 cannot restrict the rotation of the workpiece A relative to the positioning pin 7, therefore, a zero-point positioning fixture device provided in this embodiment effectively restricts the rotation of the workpiece A around the vertical direction by setting a rotation constraint mechanism, preventing the workpiece A from rotating around the positioning pin 7, thereby preventing the workpiece A from rotating around the vertical direction. Cooperating with the lifting mechanism 5 and the positioning pin 7 that can position the workpiece A in the vertical and horizontal directions, precise positioning of the workpiece A is achieved, thereby ensuring the position accuracy of each clamping. The workpiece A is pressed onto the lifting mechanism 5 by the pressing mechanism to ensure that the workpiece A is reliably clamped on the fixture tooling. By fixing the fixture tooling on the sub-plate 2 and quickly positioning the sub-plate 2 and the mother plate 1 fixed on the workbench 4 through the zero-point positioning unit, the time consumed for positioning the fixture tooling after being hoisted onto the machine tool is reduced.

[0048] In a specific embodiment, as Figures 2 to 7 shown, the support includes a first support 8 and a second support 9 arranged oppositely, and the rotation constraint mechanism includes a first locking mechanism and a second locking mechanism;

[0049] As Figures 5 to 7 shown, the first locking mechanism includes a first bolt 10 and a locking nut 11. The first bolt 10 is threadedly connected to the first support 8, and the locking nut 11 is sleeved on the first bolt 10. By screwing the first bolt 10, the head of the first bolt 10 can abut against the workpiece A;

[0050] After the head of the first bolt 10 abuts against the workpiece A, tighten the locking nut 11 so that the locking nut 11 abuts tightly against the first support 8, thereby preventing the first bolt 10 from loosening during the machining of the workpiece A;

[0051] As Figure 5 shown, a threaded hole is formed in the second support 9. The second locking mechanism includes an adjusting bolt 12, a pin with a head 13, a return spring 14, and a mounting block 15. The axis of the pin with a head 13 is parallel to the axis of the first bolt 10;

[0052] The mounting block 15 is fixed on the second support 9. A through hole is formed in the mounting block 15. A cavity communicating with the threaded hole and the through hole is formed between the second support 9 and the mounting block 15. The adjusting bolt 12 is installed in the threaded hole, the pin with a head 13 is inserted into the through hole, the pin with a head 13 can slide along the through hole, the head of the pin with a head 13 is arranged in the cavity, and the return spring 14 is arranged in the cavity and sleeved on the pin with a head 13;

[0053] Tighten the adjustment bolt 12, and the adjustment bolt 12 pushes the head of the pin shaft 13 with a head towards the workpiece A so that the pin shaft 13 with a head abuts against the workpiece A. At this time, the return spring 14 is compressed. Loosen the adjustment bolt 12, the return spring 14 releases the elastic force, and the return spring 14 drives the pin shaft 13 with a head to reset;

[0054] As Figure 4 shown, the mating positions of the first bolt 10, the pin shaft 13 with a head, and the locating pin 7 with the workpiece A are distributed in a triangle ( Figure 4 there is occlusion, and their mating positions with the workpiece A are respectively located at the three vertices of the triangle), which can effectively prevent the workpiece A from rotating relative to the locating pin 7;

[0055] In actual use, the rotation restraint mechanism can also be used to adjust the position of the workpiece A. For the convenience of explaining the rotation direction, taking Figure 4 the perspective as an example, when the workpiece A has an offset and needs fine adjustment, the first bolt 10 / the pin shaft 13 with a head can be moved away from the workpiece A, and the pin shaft 13 with a head / the first bolt 10 can be moved closer to the workpiece A, so that the workpiece A is pushed by the pin shaft 13 with a head / the first bolt 10, causing the workpiece A to rotate clockwise / counterclockwise relative to the locating pin 7.

[0056] In a specific embodiment, the pressing mechanism is a pressing plate assembly. As Figure 5 shown, the pressing plate assembly includes a push rod 26, a pressing screw 16, a pressing plate nut 17, and a pressing plate 18. The push rod 26 and the pressing screw 16 are fixed on the support. The pressing plate nut 17 is sleeved on the pressing screw 16. The pressing plate 18 is located between the pressing plate nut 17 and the support. The pressing plate 18 is movably sleeved on the pressing screw 16. One end of the pressing plate 18 abuts against the top end of the push rod 26, and the other end of the pressing plate 18 can press the workpiece A;

[0057] In this embodiment, a waist-shaped hole is provided on the pressing plate 18, and the pressing plate 1 is movably sleeved on the pressing screw 16 through the waist-shaped hole. Tighten the pressing plate nut 17 so that the pressing plate 18 can press and fix the workpiece A on the lifting mechanism 5.

[0058] In a specific embodiment, as Figure 3 shown, the pressing plate assembly further includes a spring 22. The spring 22 is sleeved on the pressing screw 16. The spring 22 is located between the pressing plate 18 and the support, and the spring 22 is used to support the pressing plate 18.

[0059] In a specific embodiment, the pressing mechanism is a holding device. As Figure 2 and Figure 3As shown, the pressing device includes a second support rod 23, a second connecting rod 24, and a pressing bolt 25. The second support rod 23 is vertically arranged on the support. In this embodiment, the second support rod 23 is fixed to the second support 9 by bolts. One end of the second connecting rod 24 is rotatably connected to the second support rod 23, and the other end of the second connecting rod 24 is threadedly connected to the pressing bolt 25;

[0060] Rotating the second connecting rod 24 can make the projection of the second connecting rod 24 in the vertical direction non-overlap or overlap with the projection of the workpiece A in the vertical direction;

[0061] When the projection of the second connecting rod 24 in the vertical direction overlaps with the projection of the workpiece A in the vertical direction, screwing the pressing bolt 25 can make the head of the pressing bolt 25 press the workpiece A;

[0062] When the workpiece A needs to be placed on the fixture tooling, the second connecting rod 24 can be rotated to make the second connecting rod 24 avoid the workpiece A placed on the fixture tooling from above;

[0063] When the workpiece A needs to be pressed, rotate the second connecting rod 24 in the reverse direction to make the pressing bolt 25 located above the workpiece A, and screw the pressing bolt 25 so that the pressing bolt 25 can press the workpiece A;

[0064] In this embodiment, as Figure 8 shown, a blind hole for allowing the rotation part 29 to be inserted is provided on the second support rod 23. A limit bolt 28 is fixed on the blind hole. One end of the second connecting rod 24 is provided with a hollow rotation part 29. The rotation part 29 is sleeved on the limit bolt 28. The rotation part 29 can rotate in the blind hole. The other end of the second connecting rod 24 is provided with a threaded hole. The pressing bolt 25 is installed in the threaded hole. By screwing the pressing bolt 25, the workpiece A is pressed on the lifting mechanism 5;

[0065] In actual use, according to the shape of the workpiece A, the pressing mechanism selects a pressing plate assembly and / or a pressing device. In this embodiment, three pressing plate assemblies and one pressing device are selected to jointly press the workpiece A.

[0066] In a specific embodiment, it further includes an auxiliary positioning device, such as Figure 6As shown, the auxiliary positioning device includes a first support rod 19, a first connecting rod 20, and a pressing head 21. The first support rod 19 is vertically arranged on the support. In this embodiment, the first support rod 19 is fixed to the second support 9 by bolts. One end of the first connecting rod 20 is rotatably connected to the first support rod 19, and the other end of the first connecting rod 20 is fixedly connected to the pressing head 21. In this embodiment, the structure of the rotational connection between the first connecting rod 20 and the first support rod 19 is similar to the structure of the rotational connection between the second connecting rod 24 and the second support rod 23, and will not be elaborated here;

[0067] Rotating the first connecting rod 20 can make the projection of the first connecting rod 20 in the vertical direction non-overlap or overlap with the projection of the workpiece A in the vertical direction;

[0068] When the projection of the first connecting rod 20 in the vertical direction overlaps with the projection of the workpiece A in the vertical direction, the jacking mechanism 5 jacks up the workpiece A, enabling the pressing head 21 to press against the top of the workpiece A;

[0069] When the workpiece A needs to be placed on the fixture tooling, the first connecting rod 20 can be rotated to make the first connecting rod 20 avoid the workpiece A placed on the fixture tooling from above;

[0070] When the workpiece A needs to be adjusted in the vertical direction, the first connecting rod 20 is rotated in the reverse direction to make the pressing head 21 located above the workpiece A, so that the pressing head 21 can press the workpiece A jacked up by the jacking mechanism 5, restricting the workpiece A in the vertical direction and facilitating the adjustment of the jacking height of the jacking mechanisms 5 at the four corners of the workpiece A.

[0071] In a specific embodiment, the jacking mechanism 5 is a screw jack, which is easy to maintain and safe and reliable to use.

[0072] In actual operation, the workpiece A is guided and positioned on the fixture tooling through the rough positioning plate 6. The positioning pin 7 is inserted into the pin hole provided on the workpiece A. After restricting the rotation of the workpiece A through the rotation restricting mechanism, the pressing head 21 of the auxiliary positioning device is moved above the workpiece A, and the jacking mechanism 5 jacks up the workpiece A to cooperate with the pressing head 21 for positioning. After the positioning is completed, the clamping mechanism clamps and fixes the workpiece A on the jacking mechanism 5 to complete the clamping of the workpiece A.

[0073] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A zero point positioning fixture device, characterized in that: include: Fixture and quick-change structure; The quick-change structure comprises a motherboard (1), a sub-board (2) and a plurality of zero-point positioning units, wherein the motherboard (1) is fixed on a working table (4) of a machine tool, and the sub-board (2) is mounted on the motherboard (1) via the zero-point positioning units; The fixture comprises a base plate (3), a support, a lifting mechanism (5), a rough positioning plate (6), a positioning pin (7), a clamping mechanism and a rotation restraining mechanism; The base plate (3) is arranged on the sub-plate (2), the positioning pin (7) and at least three lifting mechanisms (5) are arranged on the base plate (3), the support is arranged on the base plate (3), and the rotation restraining mechanism and the pressing mechanism arranged opposite to the lifting mechanism (5) are arranged on the support; The rough positioning plate (6) is fixed on the bottom plate (3) and / or the support, the rough positioning plate (6) is arranged along the contour of the workpiece (A), and a chamfer or rounded corner is provided on a side of the rough positioning plate (6) facing the workpiece (A); The lifting mechanism (5) is used to position and support the workpiece (A) in a vertical direction perpendicular to the base plate (3); the clamping mechanism is used to press the workpiece (A) onto the lifting mechanism (5); the positioning pin (7) is used to position the workpiece (A) in a horizontal direction perpendicular to the vertical direction; and the rotation restraining mechanism is used to restrain the workpiece (A) from rotating around the vertical direction.

2. A zero point positioning fixture device according to claim 1, characterized in that: The support comprises a first support (8) and a second support (9) which are arranged opposite to each other, and the rotation restraining mechanism comprises a first locking mechanism and a second locking mechanism; The first locking mechanism comprises a first bolt (10) and a locking nut (11), wherein the first bolt (10) is threadedly connected to the first support (8), and the locking nut (11) is sleeved on the first bolt (10), and the first bolt (10) is screwed so that the head of the first bolt (10) can abut against the workpiece (A); A threaded hole is formed on the second support (9), and the second locking mechanism comprises an adjusting bolt (12), a headed pin shaft (13), a return spring (14) and a mounting block (15), wherein the axis of the headed pin shaft (13) is parallel to the axis of the first bolt (10); The mounting block (15) is fixed on the second support (9), a through hole is provided on the mounting block (15), the second support (9) and the mounting block (15) enclose a cavity connected with the threaded hole and the through hole, the adjusting bolt (12) is installed in the threaded hole, the headed pin shaft (13) is inserted into the through hole, the headed pin shaft (13) can slide along the through hole, the head of the headed pin shaft (13) is arranged in the cavity, and the reset spring (14) is arranged in the cavity and sleeved on the headed pin shaft (13); The adjusting bolt (12) is tightened, and the adjusting bolt (12) pushes the head of the head pin (13) close to the workpiece (A), so that the head pin (13) abuts against the workpiece (A); the adjusting bolt (12) is loosened, and the reset spring (14) drives the head pin (13) to reset.

3. A zero point positioning fixture device according to claim 1, characterized in that: The clamping mechanism is a pressure plate assembly, which includes a push rod (26), a clamping screw (16), a pressure plate nut (17) and a pressure plate (18). The push rod (26) and the clamping screw (16) are fixed on a support, the pressure plate nut (17) is sleeved on the clamping screw (16), the pressure plate (18) is located between the pressure plate nut (17) and the support, and the pressure plate (18) is movably sleeved on the clamping screw (16). One end of the pressure plate (18) abuts against the top end of the push rod (26), and the other end of the pressure plate (18) can press the workpiece (A).

4. A zero point positioning fixture device according to claim 3, characterized in that: The pressure plate assembly also includes a spring (22), which is sleeved on the pressing screw (16). The spring (22) is located between the pressure plate (18) and the support.

5. A zero point positioning fixture device according to claim 1, characterized in that: The clamping mechanism is a clamping device, which comprises a second support rod (23), a second connecting rod (24) and a clamping bolt (25), wherein the second support rod (23) is vertically arranged on a support, one end of the second connecting rod (24) is rotatably connected to the second support rod (23), and the other end of the second connecting rod (24) is threadedly connected to the clamping bolt (25); The second connecting rod (24) is rotated so that the projection of the second connecting rod (24) in the vertical direction and the projection of the workpiece (A) in the vertical direction are non-overlapping or overlapping; When the projection of the second connecting rod (24) in the vertical direction overlaps with the projection of the workpiece (A) in the vertical direction, the clamping bolt (25) is screwed so that the head of the clamping bolt (25) can press the workpiece (A).

6. A zero point positioning fixture device according to claim 1, characterized in that: It also includes an auxiliary positioning device, which includes a first support rod (19), a first connecting rod (20) and a pressure head (21), wherein the first support rod (19) is vertically arranged on a support, one end of the first connecting rod (20) is rotatably connected to the first support rod (19), and the other end of the first connecting rod (20) is fixedly connected to the pressure head (21); The first connecting rod (20) is rotated so that the projection of the first connecting rod (20) in the vertical direction and the projection of the workpiece (A) in the vertical direction are non-overlapping or overlapping; When the projection of the first connecting rod (20) in the vertical direction overlaps with the projection of the workpiece (A) in the vertical direction, the lifting mechanism (5) lifts the workpiece (A) so that the pressing head (21) can press and hold the workpiece (A).

7. A zero point positioning fixture device according to claim 1, characterized in that: The lifting mechanism (5) is a screw jack.

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