CN210937720U

CN210937720U - Positioning jig

Info

Publication number: CN210937720U
Application number: CN201920260865.XU
Authority: CN
Inventors: 巩喜然; 曹洪涛; 刘亮; 吕启涛; 高云峰
Original assignee: Han s Laser Technology Industry Group Co Ltd
Current assignee: Han s Laser Technology Industry Group Co Ltd
Priority date: 2019-03-01
Filing date: 2019-03-01
Publication date: 2020-07-07
Anticipated expiration: 2029-03-01

Abstract

The utility model discloses a positioning jig, include: the jig comprises a jig base plate, wherein at least one positioning mechanism is arranged on the jig base plate, and the positioning mechanism comprises a pressing and blocking assembly, a pressing and assembling piece, a side pressing assembly and a plurality of positioning pins. The positioning pin comprises a bottom surface positioning pin, a side surface positioning pin and a fool-proof pin; the pressing and blocking assembly comprises a pressing block and a stop block, the pressing assembly comprises a first fixing block, a first sliding stop block and a first elastic reset mechanism, and the side pressing assembly comprises a second fixing block, a second sliding stop block and a second elastic reset mechanism. The utility model is suitable for a to platykurtic space curved surface class product positioning jig on the laser marking equipment, this tool location is accurate, the simple operation, and processing is simple, and easy compatible not unidimensional internal variation product is on laser equipment.

Description

Positioning jig

Technical Field

The utility model is suitable for a processing technology field on the laser marking equipment especially relates to a positioning jig.

Background

At present, a large amount of demands of space curved surface and arc line products on the market are greatly increased, the laser processing precision is high, the quality is good, but the laser processing requires that the processing surface of the product is in the same surface as much as possible, otherwise, the processing quality cannot be guaranteed, in order to continue to use the original processing equipment and simultaneously meet the market demand of the current stage, and the fixture for fixing the product is positioned to solve the problem. The existing jig mainly adopts a profiling machining or vacuum adsorption mode. The profiling jig is difficult to process, excessive positioning is easily caused, errors occur when the product jig is positioned, deformation is caused, the positioning error is large, and the manufacturing cost of the jig is high; the vacuum adsorption type jig cannot be used in assembly line or multi-station machining due to the limitation of an air pipe.

SUMMERY OF THE UTILITY MODEL

The to-be-solved problem of the utility model is to provide a positioning jig, can solve current tool and fix a position inaccurately in product course of working, easy excessive location causes the product of location to warp, the error increase, tool installation inconvenient, tool cost of manufacture high problem.

In order to solve the technical problem, the utility model discloses a technical scheme provide a positioning jig, include: the jig comprises a jig base plate, wherein at least one positioning mechanism is arranged on the jig base plate, and the positioning mechanism comprises a pressing and blocking assembly, a pressing assembly, a side pressing assembly and a plurality of side positioning pins.

Further, be equipped with 2 positioning mechanism on the tool bottom plate, for example: at the same time, more than 2 positioning mechanisms can be provided on the bottom plate of the jig, for example, 3 or 4 positioning mechanisms can be provided.

Furthermore, the pressing and blocking assembly comprises a pressing block, a stopping block and two bolts, the stopping block is fixedly connected with the jig bottom plate, a semicircular slide rail is formed on the stopping block, waist-shaped holes are formed in two sides of the semicircular slide rail respectively by the stopping block, an arc-shaped protruding structure is formed at the lower end of the pressing block, a sliding groove matched with the semicircular slide rail is formed in one side surface of the pressing block, and two through holes are formed in the pressing block; the two bolts respectively penetrate through the waist-shaped holes corresponding to the stop blocks and the through holes corresponding to the pressing blocks in sequence, so that the pressing blocks can be adjusted in position and fixedly connected on the stop blocks.

Furthermore, the pressing assembly comprises a first fixed block, a first sliding stop block and a first elastic reset mechanism, the first sliding stop block is connected with the first fixed block through the first elastic reset mechanism, and an upper inclined surface and a lower inclined surface are formed at one end surface of the first sliding stop block; a first groove is formed in the bottom of the first sliding stop block, first hooks are arranged at one ends of two sides of the first groove respectively, and first limiting baffle plates matched with the first hooks are arranged at one end portions of two sides of the first fixing block respectively.

Furthermore, first elasticity canceling release mechanical system includes first compression spring and second compression spring, first telescopic shaft and second telescopic shaft, first axle sleeve and second axle sleeve and first bolt axle.

Furthermore, a first bump is formed on the first fixing block, a first circular through hole and a second circular through hole are formed in the first bump in the transverse direction, and the first shaft sleeve is embedded into the first circular through hole; the second shaft sleeve is embedded into the second round through hole; the first telescopic shaft penetrates through the first shaft sleeve, and the second telescopic shaft penetrates through the second shaft sleeve; the end surfaces of one ends of the first telescopic shaft and the second telescopic shaft are respectively provided with a first straight-line groove; the first compression spring is sleeved at one end of the first telescopic shaft, and the second compression spring is sleeved at one end of the second telescopic shaft; one end of the first compression spring is abutted against the free end of the first shaft sleeve, and one end of the second compression spring is abutted against the free end of the second shaft sleeve; the bottom surface of the first sliding stop block is provided with a first groove, and the other end of the first compression spring and the other end of the second compression spring are respectively abutted against the bottom wall of the first groove of the first sliding stop block; first through holes are respectively formed in two sides of the first groove, and second through holes are respectively formed in the positions, corresponding to the first through holes, of the first telescopic shaft and the second telescopic shaft; the first bolt shaft penetrates through the first through hole and the second through hole to achieve sliding adaptation of the first sliding stop block and the first fixing block.

Further, the side pressure assembly comprises a second fixed block, a second sliding stop block and a second elastic reset mechanism, the second sliding stop block is connected with the second fixed block through the second elastic reset mechanism, and an upper inclined plane and a bottom plane are formed at one end face of the second sliding stop block; the bottom of the second sliding stop block is provided with a second groove, one ends of two sides of the second groove are respectively provided with a second hook, and one end parts of two sides of the second fixing block are respectively provided with a second limit baffle matched with the second hook.

Further, for solving the above technical problem, the utility model discloses a another technical scheme is: the second elastic reset mechanism further comprises a second compression spring, a second telescopic shaft, a second shaft sleeve and a second bolt shaft.

Furthermore, a second bump is formed on the second fixing block, a third circular through hole and a fourth circular through hole are formed in the second bump in the transverse direction, and a third shaft sleeve is embedded into the third circular through hole; the fourth shaft sleeve is embedded into the fourth circular through hole; the third telescopic shaft penetrates through the third shaft sleeve, and the fourth telescopic shaft penetrates through the fourth shaft sleeve; the end surfaces of one ends of the third telescopic shaft and the fourth telescopic shaft are respectively provided with a second linear groove; a third compression spring is sleeved at one end of the third telescopic shaft, and a fourth compression spring is sleeved at one end of the fourth telescopic shaft; one end of the third compression spring is abutted against the free end of the third shaft sleeve, and one end of the fourth compression spring is abutted against the free end of the fourth shaft sleeve; the bottom surface of the second sliding stop block is provided with a second groove, and the other end of the third compression spring and the other end of the fourth compression spring are respectively abutted against the bottom wall of the second groove of the second sliding stop block; third through holes are respectively formed in two sides of the second groove, and fourth through holes are respectively formed in the positions, corresponding to the third through holes, of the third telescopic shaft and the fourth telescopic shaft; the second bolt shaft passes through the third through hole and the fourth through hole to realize the sliding adaptation of the second sliding stop block and the second fixing block.

Further, still be provided with the bottom surface locating pin on the tool bottom plate, prevent slow-witted round pin, the bottom surface locating pin is used for supporting the product bottom surface, and the side locating pin sets up in product side position, prevents slow-witted round pin and puts in order to prevent that the product from turning over.

Compared with the prior art, the utility model provides a technical scheme has following beneficial effect: the utility model discloses a positioning jig has realized the location to the space curved surface product, has guaranteed that product location loading and unloading are convenient, realizes right and the not equidirectional location downwards to the product, and positioning assembly has adopted elastic mechanism to constitute and has compared current positioning jig overall structure simple, with low costs, long service life and fix a position accurately, and this positioning jig adopts pure mechanical structure locate mode to guarantee that the product is abundant decide and not have the location.

Drawings

Fig. 1 is a schematic structural diagram of a positioning fixture in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the positioning fixture in the embodiment of FIG. 1;

FIG. 3 is a schematic structural view of the hold-down assembly in the embodiment of FIG. 1;

FIG. 4 is a schematic diagram of the reset state of the hold-down assembly of the embodiment of FIG. 1;

FIG. 5 is a schematic diagram of the embodiment of FIG. 1 in a compressed state;

FIG. 6 is a schematic diagram of the construction of the hold-down assembly in the embodiment of FIG. 1;

FIG. 7 is a schematic structural view showing a reset state of the side pressure assembly in the embodiment of FIG. 1;

FIG. 8 is a schematic view showing a compressed state of the side pressure assembly in the embodiment of FIG. 1;

FIG. 9 is a schematic diagram of the construction of the side pressure assembly in the embodiment of FIG. 1.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a positioning fixture according to an embodiment of the present invention, and referring to fig. 1, a positioning fixture 10 in this embodiment includes: the jig base plate 11, the jig base plate 11 is equipped with first positioning mechanism and second positioning mechanism.

Wherein, first positioning mechanism includes: the device comprises a first pressing and blocking component 21, a second pressing and blocking component 22, a first pressing component 23, a first side pressing component 24, a first side positioning pin 26, a second side positioning pin 27 and a first fool-proof pin 28.

Wherein, a first pressing component 23 is arranged on one side of the jig base plate 11 far away from the first pressing and blocking component 21 and the second pressing and blocking component 22; the first pressing component 23 is adjacently provided with a first side pressing component 24, one side far away from the first side pressing component 24 is provided with a first side positioning pin 26 and a second side positioning pin 27, the first side positioning pin 26 and the second side positioning pin 27 are positioned by abutting against the side of the product 25, the first side positioning pin 26 is adjacently provided with a first fool-proof pin 28, and the first fool-proof pin 28 is mainly used for fixing the product 25 in one mode and preventing the product 25 from being placed backwards.

Wherein, second positioning mechanism includes: the third pressing and blocking component 31, the fourth pressing and blocking component 32, the second pressing component 33, the second side pressing component 34, the third side positioning pin 36, the fourth side positioning pin 37 and the second fool-proof pin 38.

A second pressing component 33 is arranged on one side of the jig base plate 11, which is far away from the third pressing and blocking component 31 and the fourth pressing and blocking component 32; the second pressing component 33 is adjacently provided with a second side pressing component 34, one side far away from the second side pressing component 34 is provided with a third side positioning pin 36 and a fourth side positioning pin 37, the third side positioning pin 36 and the fourth side positioning pin 37 are positioned close to the side of the product 35, the third side positioning pin 36 is adjacently provided with a second fool-proof pin 38, and the second fool-proof pin 38 is mainly used for fixing the product 35 only in one way and preventing the product 35 from being placed backwards.

Referring to fig. 2, fig. 2 is a schematic structural diagram of the positioning fixture in the embodiment of fig. 1; in fig. 2, the jig base plate 11 is provided with 2 sets of base surface positioning pins, namely a first base surface positioning pin 39 and a second base surface positioning pin 40, the first base surface positioning pin 39 comprises 4 base surface positioning pins which are symmetrically arranged on the jig base plate 11, the second base surface positioning pin 40 comprises 4 base surface positioning pins which are symmetrically arranged on the jig base plate 11, and the first base surface positioning pin 39 and the second base surface positioning pin 40 are used for supporting the bottom surface of the product 25 to prevent the product from being scratched.

Referring to fig. 3, in the embodiment of the present invention, the first pressing and blocking assembly 21 includes a pressing block 211, a stop block 212 and a bolt, the bottom of the stop block 212 is respectively provided with a circular hole fixedly connected to the jig base plate 11, a semicircular slide rail is configured on the upper side of the stop block 212, the semicircular slide rail is used to cooperate with the pressing block 211 to slide up and down, the stop block 212 respectively forms a waist-shaped hole on two sides of the semicircular slide rail, and the waist-shaped holes are used for adjusting different ranges when positioning a product.

Wherein, briquetting 211 lower extreme is constructed and is had an arc protruding structure, and its lower extreme arc protruding structure constructs and can compress tightly the product in vertical direction to guarantee to form line contact or point contact with the product, if: a curved surface shaped product.

Wherein, a sliding groove matched with the semicircular sliding rail is formed on one side surface of the pressing block 211, two through holes are formed on two sides of the pressing block 211 respectively, and two manual bolts respectively and sequentially penetrate through the waist-shaped holes corresponding to the stop block 212 and the through holes corresponding to the pressing block 211 respectively, so that the pressing block 211 is fixedly connected on the stop block 212 in a position-adjustable manner. The side constructs into semi-circular slide rail on the dog 212 and satisfies the product location effect, guarantees simultaneously that the position does not squint when briquetting 211 adjusts from top to bottom at dog 212, has improved the fender subassembly location precision of pressing.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a reset state of the pressing assembly in the embodiment of fig. 1: fig. 4 shows that the first pressing assembly 23 includes a first fixing block 231, a first slide stopper 236, and a first elastic return mechanism, the first slide stopper 236 is connected to the first fixing block 231 by the first elastic return mechanism and a first latch shaft 237, and an upper inclined surface a1 and a lower inclined surface b1 are formed at one end surface of the first slide stopper 236; a first groove is formed at the bottom of the first sliding block 236, first hooks are respectively disposed at two ends of the first groove, and first limit baffles adapted to the first hooks are respectively disposed at one end of two sides of the first fixing block 231.

The first sliding block 236 is disposed on the first fixing block 231, the first fixing block 231 sets the assembly on the jig base plate 11, and the first fixing block 231 has waist-shaped holes at two sides for adjusting the installation position, so that the size of the elastic force of the compression spring can be conveniently adjusted, and the products in different specification ranges can be positioned.

Wherein, first slide block 236 is configured with upper inclined plane a1 and lower inclined plane b1 at an end face, and this upper and lower inclined plane structure can play the product of different shapes to fix a position, can realize simultaneously to the product two orientation positioning effect right and down.

Wherein, first elasticity canceling release mechanical system includes: first and

second compression springs

234 and 235, first and second

telescopic shafts

238 and 239, first and

second bushings

232 and 233, and first latch shaft 237.

The first elastic reset mechanism adopts the working principle that the first sliding stop block 236 of the first elastic reset mechanism slides inwards by acquiring potential energy applied from the outside through sliding, and the first sliding stop block 236 fixes and positions a product after acquiring reset kinetic energy when the potential energy from the outside is released.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a compression state of the compressing assembly in the embodiment of fig. 1, wherein a first linear groove 2381 and a second linear groove 2391 are respectively disposed at two ends of the first telescopic shaft 238 and the second telescopic shaft 239, and the first linear groove 2381 and the second linear groove 2391 are conveniently rotated by a linear screwdriver during assembly.

Referring to fig. 6, fig. 6 is a schematic structural view of the compressing assembly in the embodiment of fig. 1,

a first bump is formed on the first fixing block 231, a first circular through hole and a second circular through hole are formed in the first bump at the transverse position, the first shaft sleeve 232 is embedded into the first circular through hole, and the second shaft sleeve 233 is embedded into the second circular through hole; the first telescopic shaft 238 passes through the first shaft sleeve 232, and the second telescopic shaft 239 passes through the second shaft sleeve 233; the end surfaces of one ends of the first telescopic shaft 238 and the second telescopic shaft 239 are respectively provided with a first straight-line-shaped groove 2381 and a second straight-line-shaped groove 2391; a first compression spring 234 is sleeved at one end of the first telescopic shaft 238, and a second compression spring 235 is sleeved at one end of the second telescopic shaft 239; one end of the first compression spring 234 abuts against the free end 2321 of the first bushing sleeve 232, and one end of the second compression spring 235 abuts against the free end 2331 of the second bushing sleeve 233; the bottom surface of the first sliding stop 236 is provided with a first groove, and the other end of the first compression spring 234 and the other end of the second compression spring 235 are respectively abutted against the bottom wall of the first groove of the first sliding stop 236; first through holes are respectively formed in two sides of the first groove, and second through holes are respectively formed in the positions, corresponding to the first through holes, of the first telescopic shaft 238 and the second telescopic shaft 239; the first latch shaft 237 passes through the first through hole and the second through hole to realize the sliding fit of the first sliding stopper 236 and the first fixing block 231.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a reset state of the side pressure assembly in the embodiment of fig. 1: fig. 7 shows that the first lateral pressing assembly 24 includes a second fixed block 241, a second sliding block 246, a second elastic return mechanism, the second sliding block 246 is connected to the second fixed block 241 through the second elastic return mechanism and a second latch shaft 247, and an end surface of the second sliding block 246 is formed with an upper inclined surface a2 and a lower inclined surface b 2; a second groove is formed at the bottom of the second sliding block 246, a second hook is respectively disposed at one end of each of two sides of the second groove, and a second limit baffle adapted to the second hook is respectively disposed at one end of each of two sides of the second fixing block 241.

The second sliding block 246 is disposed on the second fixing block 241, the second fixing block 241 mounts the assembly on the jig base plate 11, and the two sides of the second fixing block 241 are provided with waist-shaped holes for adjusting the mounting position, so that the size of the elastic force of the compression spring can be conveniently adjusted, and the product in different specification ranges can be positioned.

Wherein, the second sliding block 246 is configured with an upper slope a2 and a lower slope b2 at one end face, and the horizontal plane b2 makes the product play a role of lateral compression.

Wherein, second elasticity canceling release mechanical system includes: a third compression spring 244 and a fourth compression spring 245, a third telescopic shaft 248 and a fourth telescopic shaft 249, a third shaft sleeve 242 and a fourth shaft sleeve 243, and a second latch shaft 247.

The second elastic reset mechanism enables the second sliding block 246 to acquire potential energy applied from the outside to slide inwards through sliding, when the potential energy of the outside is released, the second sliding block 246 acquires reset kinetic energy and then fixes and positions the product, and the service life and the positioning precision of the second sliding block are ensured by adopting the second elastic reset mechanism.

Referring to fig. 8, fig. 8 is a schematic structural view illustrating a compressed state of the side pressure assembly in the embodiment of fig. 1, wherein a third linear groove 2481 and a fourth linear groove 2491 are respectively formed at both ends of the third telescopic shaft 248 and the fourth telescopic shaft 249, and the third linear groove 2481 and the fourth linear groove 2491 are conveniently rotated by a linear screwdriver during assembly.

Referring to fig. 9, fig. 9 is a schematic view showing the construction of the side pressure assembly in the embodiment of fig. 1,

a second bump is formed on the second fixed block 241, a first circular through hole and a second circular through hole are formed in the second bump at the transverse position, the third shaft sleeve 242 is embedded in the first circular through hole, and the fourth shaft sleeve 243 is embedded in the second circular through hole; a third telescopic shaft 248 passes through the third shaft sleeve 242, and a fourth telescopic shaft 249 passes through the fourth shaft sleeve 243; a third linear groove 2481 and a fourth linear groove 2491 are respectively formed on the end surfaces of one ends of the third telescopic shaft 248 and the fourth telescopic shaft 249; a third compression spring 244 is sleeved at one end of the third telescopic shaft 248, and a fourth compression spring 245 is sleeved at one end of the second telescopic shaft 249; one end of the third compression spring 244 abuts against the free end 2421 of the third shaft sleeve 232, and one end of the fourth compression spring 245 abuts against the free end 2431 of the second shaft sleeve 243; a second groove is arranged on the bottom surface of the second sliding block 246, and the other end of the third compression spring 244 and the other end of the fourth compression spring 245 are respectively abutted against the bottom wall of the second groove of the second sliding block 246; third through holes are respectively formed in two sides of the second groove, and fourth through holes are respectively formed in the positions, corresponding to the third through holes, of the third telescopic shaft 248 and the fourth telescopic shaft 249; the second latch shaft 247 passes through the third through hole and the fourth through hole to realize sliding fit of the second sliding stopper 246 and the second fixing block 241.

In this embodiment, the various components disposed on the second positioning mechanism have the same structure, function, and position relationship with the first positioning mechanism, and therefore no further description is provided herein.

The working principle in the above embodiment is as follows: when putting in the product 25, the operator pushes the second sliding block 246 of the first lateral pressing assembly 24 outwards by hand, and then inserts one edge of the product 25 into the bottom position of the pressing block 211 above the first pressing block assembly 21 and the second pressing block assembly 22 by hand, so that the edge of the product 25 contacts with the arc-shaped protruding position of the pressing block 211, the pressing block 211 plays a role in pressing and positioning the product, then presses down the product 25, the middle position of the edge of the product 25 contacts with the inclined plane a1 of the first sliding block 236 of the first pressing assembly 23, the first sliding block 236 retracts automatically when being pressed down by the middle position of the edge of the product 25, and the product 25 is continuously pressed down until the first sliding block 236 is reset and ejected, and then contacts with the inclined plane b1 and is pressed.

In addition, a set of first bottom plate positioning pins 39 on the jig bottom plate 11 supports the bottom surface of the product 25, the operator releases the second sliding stop block 246 and then automatically resets, and fixes and compresses the side edge of the product 25 and the plane b2 of the second sliding stop block 246, the product 25 is positioned and fixed and then is tightly attached to and positioned by the first side positioning pins 26 and the second side positioning pins 27 arranged on the jig bottom plate 11, and meanwhile, the first fool-proof pins 28 are arranged on the jig bottom plate 11 to prevent the product from being reversed. Referring to fig. 1, in the embodiment, the jig base plate 11 is provided with 2 positioning mechanisms, wherein the specific operation method of the second positioning mechanism is the same as that of the first positioning mechanism, and therefore, the detailed description thereof is omitted here.

To sum up, the utility model discloses a positioning jig has realized the location to the space curved surface product, has guaranteed that product location loading and unloading are convenient, realizes right and the not equidirectional location downwards to the product, and positioning assembly has adopted elastic mechanism to constitute and has compared current positioning jig overall structure simple, with low costs, long service life and fix a position accurately, and this positioning jig adopts pure mechanical structure locate mode to guarantee that the product is abundant surely just not had the location, solves traditional positioning jig trachea winding problem on the assembly line.

It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.

Claims

1. A positioning jig is characterized by comprising:

a jig base plate;

at least one positioning mechanism is arranged on the jig base plate; the positioning mechanism comprises a pressing and blocking assembly, a pressing assembly, a side pressing assembly and a plurality of side positioning pins.

2. The positioning fixture according to claim 1,

two groups of positioning mechanisms are arranged on the jig base plate.

3. The positioning fixture according to claim 1,

the pressing and blocking assembly comprises a pressing block, a stop block and two bolts, the stop block is fixedly connected with the jig bottom plate, a semicircular slide rail is constructed on the stop block, and waist-shaped holes are respectively constructed on two sides of the semicircular slide rail by the stop block;

the lower end of the pressing block is provided with an arc-shaped protruding structure, one side surface of the pressing block is provided with a sliding groove matched with the semicircular sliding rail, and the pressing block is provided with two through holes;

the two bolts respectively penetrate through the waist-shaped holes corresponding to the stop blocks and the through holes corresponding to the pressing blocks in sequence, so that the pressing blocks are fixedly connected on the stop blocks in a position-adjustable manner.

4. The positioning fixture according to claim 1,

the pressing assembly comprises a first fixed block, a first sliding stop block and a first elastic reset mechanism, the first sliding stop block is connected with the first fixed block through the first elastic reset mechanism, and an upper inclined surface and a lower inclined surface are formed at one end surface of the first sliding stop block; the bottom of the first sliding stop block is provided with a first groove, one ends of two sides of the first groove are respectively provided with a first hook, and one end parts of two sides of the first fixing block are respectively provided with a first limit baffle matched with the first hook.

5. The positioning fixture according to claim 4,

the first elastic reset mechanism comprises a first compression spring, a second compression spring, a first telescopic shaft, a second telescopic shaft, a first shaft sleeve, a second shaft sleeve and a first bolt shaft.

6. The positioning fixture according to claim 5,

a first bump is formed on the first fixing block, a first circular through hole and a second circular through hole are formed in the first bump in the transverse direction, and the first shaft sleeve is embedded into the first circular through hole; the second shaft sleeve is embedded into the second round through hole; the first telescopic shaft penetrates through the first shaft sleeve, and the second telescopic shaft penetrates through the second shaft sleeve; the end surfaces of one ends of the first telescopic shaft and the second telescopic shaft are respectively provided with a first straight-line groove; the first compression spring is sleeved at one end of the first telescopic shaft, and the second compression spring is sleeved at one end of the second telescopic shaft; one end of the first compression spring is abutted against the free end of the first shaft sleeve, and one end of the second compression spring is abutted against the free end of the second shaft sleeve; the bottom surface of the first sliding stop block is provided with a first groove, and the other end of the first compression spring and the other end of the second compression spring are respectively abutted against the bottom wall of the first groove of the first sliding stop block; first through holes are respectively formed in two sides of the first groove, and second through holes are respectively formed in the positions, corresponding to the first through holes, of the first telescopic shaft and the second telescopic shaft; the first bolt shaft penetrates through the first through hole and the second through hole to achieve sliding adaptation of the first sliding stop block and the first fixing block.

7. The positioning fixture according to claim 4,

the side pressure assembly comprises a second fixed block, a second sliding stop block and a second elastic reset mechanism, the second sliding stop block is connected with the second fixed block through the second elastic reset mechanism, and an upper inclined plane and a bottom plane are formed at one end face of the second sliding stop block; the bottom of the second sliding stop block is provided with a second groove, one ends of two sides of the second groove are respectively provided with a second hook, and one end parts of two sides of the second fixed block are respectively provided with a second limit baffle matched with the second hook.

8. The positioning fixture of claim 7,

the second elastic reset mechanism further comprises a third compression spring, a fourth compression spring, a third telescopic shaft, a fourth telescopic shaft, a third shaft sleeve, a fourth shaft sleeve and a second bolt shaft.

9. The positioning fixture according to claim 8,

a second bump is formed on the second fixed block, a third circular through hole and a fourth circular through hole are formed in the second bump in the transverse direction, and the third shaft sleeve is embedded into the third circular through hole; the fourth shaft sleeve is embedded into the fourth circular through hole; the third telescopic shaft penetrates through the third shaft sleeve, and the fourth telescopic shaft penetrates through the fourth shaft sleeve; the end surfaces of one ends of the third telescopic shaft and the fourth telescopic shaft are respectively provided with a second linear groove; the third compression spring is sleeved at one end of the third telescopic shaft, and the fourth compression spring is sleeved at one end of the fourth telescopic shaft; one end of the third compression spring is abutted against the free end of the third shaft sleeve, and one end of the fourth compression spring is abutted against the free end of the fourth shaft sleeve; a second groove is formed in the bottom surface of the second sliding stop block, and the other end of the third compression spring and the other end of the fourth compression spring are respectively abutted against the bottom wall of the second groove of the second sliding stop block; third through holes are respectively formed in two sides of the second groove, and fourth through holes are respectively formed in the positions, corresponding to the third through holes, of the third telescopic shaft and the fourth telescopic shaft; the second bolt shaft penetrates through the third through hole and the fourth through hole to achieve sliding adaptation of the second sliding stop block and the second fixing block.

10. The positioning fixture according to claim 1,

and a bottom positioning pin and a fool-proof pin are also arranged on the jig bottom plate.