Positioning jig
By designing synchronously moving linkage and guide structures, the problem of low positioning efficiency and accuracy caused by the difference in the moving distance of multiple stops in the existing positioning fixtures is solved, and the workpiece is efficient, precisely positioned and clamped.
Patent Information
- Application Number
- CN202420009146.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-02
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-01-02
AI Technical Summary
When the existing positioning fixtures are circular workpieces, the difference in movement distances of multiple stops leads to low positioning efficiency and accuracy.
Design a positioning fixture including a base, a linkage and a guide member. The four linkage members are hinged through the guide members in turn to form a parallelogram structure, so that the movement of each pair of guide members is synchronized, ensuring that the workpiece central axis passes through the bearing center, and improving Positioning accuracy and efficiency.
It realizes efficient positioning and precise clamping of workpieces, simplifies operation, reduces labor intensity, and improves positioning accuracy and efficiency.
Smart Images
Figure CN222134696U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of positioning, in particular to a positioning fixture. Background Art
[0002] For workpieces with circular cross-sections, the center axis of the workpiece after positioning will generally pass through the center point set on the fixture where the workpiece is located, so as to improve the processing accuracy of the workpiece. At present, the commonly used positioning method is to set multiple blocks on the periphery of the center point set on the fixture. After the workpiece is placed on the fixture, the multiple blocks are moved separately so that the multiple blocks clamp the workpiece. However, in the above positioning method, the multiple blocks move separately, and there are differences in the moving distances. After the workpiece is clamped by multiple blocks, it is necessary to confirm whether the center axis of the workpiece passes through the set center point, resulting in low positioning efficiency and positioning accuracy of the workpiece. Utility Model Content
[0003] In view of the above, it is necessary to provide a positioning fixture to improve positioning efficiency and positioning accuracy.
[0004] The present invention provides a positioning fixture, comprising:
[0005] A base having a bearing surface for bearing a workpiece, wherein the bearing surface is provided with a bearing center;
[0006] Four linkage members and four guide members, the four linkage members are all arranged on the bearing surface and are hinged head-to-tail through one guide member in sequence, the connecting lines of the four guide members are arranged in a parallelogram, and the intersection of the connecting lines of each two oppositely arranged guide members is arranged coaxially with the bearing center, wherein two oppositely arranged guide members are slidably mounted on the base along a first direction, and the other two oppositely arranged guide members are slidably mounted on the base along a second direction; wherein,
[0007] The first direction is perpendicular to the second direction.
[0008] In the above positioning jig, the four linkage parts are all arranged on the bearing surface, and are hinged head and tail through a guide part in sequence. The connection lines of the four guide parts are arranged in a parallelogram, so that the two guide parts arranged opposite to each other move synchronously. In addition, the intersection of the connection lines of the two guide parts arranged opposite to each other is arranged coaxially with the bearing center, so that during the movement of the four guide parts, the distance between the two guide parts arranged opposite to each other and the bearing center is always the same, and then the center axis of the workpiece passes through the bearing center after the workpiece is fixed. Therefore, in the above positioning jig, the four linkage parts are linked by four guide parts, and the two guide parts arranged opposite to each other can move synchronously, which is simple to operate, with low labor intensity, and improves the positioning efficiency of the workpiece. In addition, the distance between the two guide parts arranged opposite to each other and the bearing center is always the same, which improves the positioning accuracy of the workpiece.
[0009] In some embodiments, each of the positioning fixtures further comprises:
[0010] Two clamping members are respectively sleeved on the two guide members arranged opposite to each other in the first direction, and the clamping members include a first connecting block and a second connecting block which are arranged at intervals along the axial direction of the guide members and sleeved on the guide members, and an abutment block connecting the first connecting block and the second connecting block, the abutment block of the first connecting block and the second connecting block protrudes toward one side of the load-bearing center to abut against the workpiece, and / or the abutment block protrudes toward one side of the load-bearing center to abut against the workpiece, and the abutment ends of the two linkage members are stacked and both accommodated between the first connecting block and the second connecting block; wherein,
[0011] The first connecting block is slidably mounted on the base along the first direction.
[0012] In some embodiments, the two guide members arranged opposite to each other in the second direction respectively include:
[0013] A guide section and an extension section are connected in sequence, a step surface is formed between the guide section and the extension section, the guide section is slidably connected to the base, and the abutting ends of the two linkage members are stacked and arranged on the step surface; wherein,
[0014] The extension section is movably arranged along a third direction through the abutting ends of the two linkage members, and the third direction is perpendicular to the first direction and the second direction.
[0015] In some embodiments, the positioning fixture further includes:
[0016] A mounting member, disposed on the bearing surface;
[0017] A moving component is connected to the mounting component, and one end of the moving component is used to push one of the guide members to slide relative to the base along the first direction or the second direction.
[0018] In some embodiments, the bearing surface is provided with a cross-arranged clamping groove and a guide groove, the clamping groove is extended along the first direction, the guide groove is extended along the second direction and communicates with the clamping groove, and the intersection of the clamping groove and the guide groove forms the bearing center. Two of the guide members slide along the clamping grooves respectively, and the other two guide members slide and clamp in the guide grooves respectively.
[0019] In some embodiments, the mounting member is a frame-shaped structure, and the moving assembly includes:
[0020] A rotating member, rotatably connected to the mounting member, so as to push one of the guide members;
[0021] Two elastic members are both received in the guide groove, and two ends of each elastic member respectively abut against the mounting member and one of the guide members.
[0022] In some embodiments, the rotating member comprises:
[0023] A screw rod, threadedly connected to the mounting member and corresponding to one of the guide members in the first direction;
[0024] The wear-resistant body is movably received in the clamping groove and is located between the screw and the guide member corresponding to the screw.
[0025] In some embodiments, the mounting member is slidably connected to the base along the first direction.
[0026] In some embodiments, the bearing surface is further provided with two slide grooves respectively connected to the guide grooves at both ends of the second direction, and the mounting member includes a main body and two protrusions connected to both ends of the main body, the main body is a frame-like structure, and the two protrusions are respectively slidably clamped in the two slide grooves and abutted against the two elastic members.
[0027] In some embodiments, the moving component includes:
[0028] A push-pull member, rotatably connected to the mounting member;
[0029] A hinged member, both ends of which are rotatably connected to the push-pull member and one of the guide members, respectively, and when the push-pull member rotates, the corresponding guide member is driven to move along the first direction or the second direction through the hinged member. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 It is a structural schematic diagram of a positioning fixture according to an embodiment of the utility model.
[0031] Figure 2 for Figure 1 An exploded schematic diagram of the positioning fixture is shown.
[0032] Figure 3 for Figure 2 The schematic diagram of the structure of the linkage parts in the positioning fixture is shown.
[0033] Figure 4 for Figure 2 A schematic diagram of the structure of one of the clamping parts in the positioning fixture shown.
[0034] Figure 5 for Figure 2A schematic diagram of the structure of another clamping member in the positioning fixture is shown.
[0035] Figure 6 for Figure 2 A schematic diagram of the structure of the guide member in the positioning fixture is shown.
[0036] Figure 7 This is an exploded schematic diagram of a positioning fixture according to another embodiment of the present invention.
[0037] Main component symbols
[0038] Positioning fixture 100
[0039] Base 110
[0040] Carrying surface 110a
[0041] Carrying center 110b
[0042] Clamping groove 110c
[0043] Guide groove 110d
[0044] Chute 110e
[0045] Linkage 120
[0046] Abutment end 120a
[0047] Upper depression 120b
[0048] Lower depression 120c
[0049] Guide 130
[0050] Step surface 130a
[0051] Guide section 131
[0052] Extension 132
[0053] Clamp 140
[0054] Clamping surface 140a
[0055] The first connection block 141
[0056] The second connection block 142
[0057] Abutment block 143
[0058] Mobile assembly 150
[0059] Rotating member 151
[0060] Screw 1511
[0061] Wear-resistant body 1512
[0062] Handle 1513
[0063] Elastic member 152
[0064] Push-pull parts 153
[0065] Hinge 154
[0066] Column 1541
[0067] Sphere 1542
[0068] Mounting 160
[0069] Main body 161
[0070] Convex body 162 DETAILED DESCRIPTION
[0071] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0072] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0073] The following is a detailed description of various embodiments of the present invention in conjunction with the accompanying drawings.
[0074] See also Figure 1 The embodiment of the utility model provides a positioning fixture 100 for improving the positioning efficiency and positioning accuracy of a workpiece, so as to facilitate the processing of the central part of the workpiece. The cross section of the workpiece is circular.
[0075] For ease of description, Figure 1 , Figure 2 and Figure 7 A three-dimensional coordinate system is added to the . Specifically, the X axis is the first direction, the Y axis is the second direction, and the Z axis is the third direction. The X axis, the Y axis, and the Z axis are perpendicular to each other.
[0076] See also Figure 1 and Figure 2 The positioning fixture 100 includes a base 110, four linkage members 120 and four guide members 130. The base 110 has a bearing surface 110a for bearing a workpiece, and the bearing surface 110a is provided with a bearing center 110b. The four linkage members 120 are all arranged on the bearing surface 110a, and are hinged end to end through a guide member 130 in sequence. The sequential connection lines of the four guide members 130 are arranged in a parallelogram, and the intersection of the connection lines of each two oppositely arranged guide members 130 is arranged coaxially with the bearing center 110b, one of the two oppositely arranged guide members 130 is slidably mounted on the base 110 along the X axis, and the other two oppositely arranged guide members 130 are slidably mounted on the base 110 along the Y axis.
[0077] In the above positioning jig 100, the four linkage members 120 are all arranged on the bearing surface 110a, and are hinged end to end through a guide member 130 in sequence. The connecting lines of the four guide members 130 are arranged in a parallelogram, so that the two guide members 130 arranged opposite to each other move synchronously. In addition, the intersection of the connecting lines of the two guide members 130 arranged opposite to each other is arranged coaxially with the bearing center 110b, so that during the movement of the four guide members 130, the distance between the two guide members 130 arranged opposite to each other and the bearing center 110b is always the same, and then the center axis of the workpiece passes through the bearing center 110b after the workpiece is fixed. Therefore, in the above positioning jig 100, the four linkage members 120 are linked by the four guide members 130, and the two guide members arranged opposite to each other can move synchronously, which is simple to operate, has low labor intensity, and improves the positioning efficiency of the workpiece. In addition, the distance between the two guide members 130 arranged opposite to each other and the bearing center 110b is always the same, which improves the positioning accuracy of the workpiece.
[0078] See also Figure 2 and Figure 3 In this embodiment, the upper surface and the lower surface of the linkage member 120 are respectively provided with an upper depression 120b and a lower depression 120c, and the upper depression 120b and the lower depression 120c are symmetrically arranged relative to the center of the linkage member 120. Among two adjacent linkage members 120, the bottom wall of the upper depression 120b of one linkage member 120 abuts against the bottom wall of the lower depression 120c of the other linkage member 120, so that the four linkage members 120 are surrounded to form a parallelogram structure, and the abutting ends 120a of each two adjacent linkage members 120 form a stacked structure. It should be noted that the abutting end 120a of the linkage member 120 refers to the end of the linkage member 120, that is, each linkage member 120 has two abutting ends 120a.
[0079] See also Figure 2 , Figure 4 and Figure 5In some embodiments, the positioning fixture 100 further includes two clamping members 140. The two clamping members 140 are respectively sleeved on two guide members 130 arranged opposite to each other on the X-axis, and the clamping member 140 includes a first connecting block 141, a second connecting block 142 and an abutting block 143. The first connecting block 141 and the second connecting block 142 are spaced apart along the Z-axis and sleeved on the guide member 130, the abutting block 143 connects the abutting block 143 of the first connecting block 141 and the second connecting block 142, and the abutting ends 120a of the two linkage members 120 are received between the first connecting block 141 and the second connecting block 142.
[0080] In this embodiment, in one of the clamping members 140, the first connecting block 141 and the second connecting block 142 protrude an abutment block 143 toward one side of the bearing center 110b, and are respectively provided with a clamping surface 140a for clamping a workpiece (see Figure 4 ), in another clamping member 140, the abutment block 143 protrudes a first connection block 141 and a second connection block 142 toward one side of the bearing center 110b, and is provided with a clamping surface 140a for clamping a workpiece (see Figure 5 ).
[0081] It is understandable that in other embodiments, both clamping members 140 can be arranged in accordance with Figure 4 The structure of the middle clamping member 140 can also be arranged according to Figure 5 The structural setting of the middle clamping member 140.
[0082] Therefore, the clamping member 140 can reduce the contact area between the linkage member 120 and the base 110 and guide the movement of the linkage member 120 to improve the efficiency of clamping the workpiece.
[0083] See also Figure 2 and Figure 6 In some embodiments, the two guide members 130 disposed opposite to each other on the Y axis respectively include a guide section 131 and an extension section 132 connected in sequence. A step surface 130a is formed between the guide section 131 and the extension section 132. The guide section 131 is slidably connected to the base 110. The abutting ends 120a of the two linkage members 120 are disposed on the step surface 130a. The extension section 132 is movably disposed through the abutting ends 120a of the two linkage members 120 along the Z axis.
[0084] In this embodiment, the guide section 131 is substantially a quadrangular prism, and the extension section 132 is substantially a cylinder. Specifically, the cross-sectional area of the extension section 132 is smaller than that of the guide section 131 , and the central axis of the extension section 132 is the same as that of the guide section 131 .
[0085] Therefore, the guide member 130 is rotatably connected with the corresponding two linkage members 120 by the extension section 132 movably penetrating the abutting end 120a of the linkage member 120, which has a simple structure, low manufacturing cost and convenient assembly.
[0086] See also Figure 1 and Figure 2 In some embodiments, the positioning fixture 100 further includes a mounting member 160 and a moving assembly 150. The mounting member 160 is disposed on the bearing surface 110a, and the moving assembly 150 is connected to the mounting member 160. One end of the moving assembly 150 is used to push one of the guide members 130 to move relative to the base 110 along the X-axis or the Y-axis.
[0087] In this embodiment, two clamping members 140 and the moving assembly 150 are sequentially arranged along the X-axis. The moving assembly 150 is used to push one of the clamping members 140 along the X-axis to drive the guide member 130 corresponding to the clamping member 140 to move along the X-axis.
[0088] Therefore, the moving component 150 is helpful to improve the assembly efficiency of the positioning fixture 100 .
[0089] See also Figure 1 and Figure 2 In some embodiments, the bearing surface 110a is provided with a cross-arranged clamping groove 110c and a guide groove 110d, the clamping groove 110c is extended along the X-axis, the guide groove 110d is extended along the Y-axis and communicates with the clamping groove 110c, and the intersection of the clamping groove 110c and the guide groove 110d forms a bearing center 110b. Two guide members 130 slide along the clamping groove 110c through two clamping members 140, and the other two guide members 130 slide along the Y-axis and are clamped in the guide groove 110d. Therefore, the clamping groove 110c and the guide groove 110d are provided to help improve the stability of the guide member 130 and the movement of the guide member 130.
[0090] See also Figure 1 and Figure 6 In this embodiment, the guide section 131 of each guide member 130 is slidably clamped in the guide groove 110d.
[0091] See also Figure 1 , Figure 4 and Figure 5 In this embodiment, the first connecting block 141 of the clamping member 140 slides along the X-axis and is clamped in the clamping groove 110c to drive the corresponding guide member 130 to slide relative to the clamping groove 110c along the X-axis.
[0092] See also Figure 1 and Figure 2In some embodiments, the mounting member 160 is a frame-shaped structure, and the moving assembly 150 includes a rotating member 151 and two elastic members 152. The rotating member 151 is rotatably connected to the mounting member 160 to push the guide member 130 corresponding to the clamping member 140 through one of the clamping members 140. The two elastic members 152 are both received in the guide groove 110d, and the two ends of each elastic member 152 respectively abut against the inner wall of the mounting member 160 and one of the guide members 130. In this embodiment, the elastic member 152 is a spring.
[0093] During operation, the rotating member 151 is rotated forward, and the rotating member 151 pushes the corresponding guide member 130 to move close to the load-bearing center 110b through the clamping member 140. The guide member 130 drives the two guide members 130 arranged oppositely on the Y axis to move away from each other through the two rotationally connected linkage members 120 and compresses the two elastic members 152. In this process, the two guide members 130 arranged oppositely on the Y axis drive the guide member 130 on the other clamping member 140 to move close to the load-bearing center 110b through the two rotationally connected linkage members 120 until the two clamping members 140 clamp the workpiece. After the workpiece is processed, the rotating member 151 is rotated in the reverse direction, and the rotating member 151 moves away from the corresponding clamping member 140. The elastic force of the two elastic members 152 is released to push the corresponding two guide members 130 to move close to each other. The two guide members 130 drive the two clamping members 140 to move away from each other through the corresponding linkage members 120, thereby releasing the processed workpiece.
[0094] Therefore, the two elastic members 152 elastically support the two guide members 130 to realize automatic reset of the two clamping members 140 , thereby improving the positioning efficiency of the positioning fixture 100 .
[0095] See also Figure 1 and Figure 2 In some embodiments, the rotating member 151 includes a screw 1511 and a wear-resistant body 1512. The screw 1511 is threadedly connected to the mounting member 160 and corresponds to one of the guide members 130 on the X-axis. The wear-resistant body 1512 is movably received in the clamping groove 110c and is located between the screw 1511 and the guide member 130 corresponding to the screw 1511.
[0096] Therefore, the wear-resistant body 1512 can reduce the damage of the screw rod 1511 and the corresponding clamping member 140 , thereby increasing the service life of the clamping member 140 and the screw rod 1511 .
[0097] In this embodiment, the rotating member 151 further includes a handle 1513. The handle 1513 is L-shaped and is clamped on the end of the screw rod 1511 to drive the screw rod 1511 to rotate, thereby improving the efficiency of rotating the screw rod 1511.
[0098] See also Figure 7In other embodiments, the moving assembly 150 includes a push-pull member 153 and a hinge member 154 to replace the rotating member 151 and the two elastic members 152 in the moving assembly 150. Specifically, the push-pull member 153 is rotatably connected to the mounting member 160, and the two ends of the hinge member 154 are respectively rotatably connected to the push-pull member 153 and one of the guide members 130. When the push-pull member 153 rotates, the corresponding guide member 130 is driven to approach or move away from the other guide member 130 through the hinge member 154. Among them, the push-pull member 153 is composed of the screw rod 1511 and the handle 1513 in the above embodiment, and the hinge member 154 includes a column 1541 and a ball 1542 connected to the two ends of the column 1541. The two balls 1542 are respectively movably embedded in the screw rod 1511 and the guide member 130 in the push-pull member 153.
[0099] In this embodiment, a ball 1542 of the hinge member 154 extends between the first connection block 141 and the second connection block 142 to be rotatably connected to the guide member 130 .
[0100] When the push-pull member 153 is rotated forward, the push-pull member 153 pushes the corresponding guide member 130 to move closer to the load-bearing center 110b through the hinge member 154. When the push-pull member 153 is rotated backward, the push-pull member 153 pulls the corresponding guide member 130 away from the load-bearing center 110b through the hinge member 154.
[0101] See also Figure 1 and Figure 2 In some embodiments, the mounting member 160 and the base 110 are slidably connected along the X-axis to improve the efficiency of assembly and disassembly of the mounting member 160 and the base 110 .
[0102] In some embodiments, the bearing surface 110a is further provided with two slide grooves 110e respectively connected to the guide groove 110d at both ends of the Y-axis. The mounting member 160 includes a main body 161 and a protrusion 162 connected to both ends of the main body 161. The main body 161 is a frame-shaped structure, and the inner wall of the main body 161 abuts against the clamping member 140 away from the rotating member 151. The two protrusions 162 are respectively slidably clamped in the slide groove 110e along the X-axis, and abut against the two elastic members 152.
[0103] Therefore, the cooperation between the protrusion 162 and the sliding groove of the sliding groove 110 e can reduce the manufacturing cost of the base 110 and the mounting member 160 .
[0104] Here, the working process of the positioning fixture 100 of the above embodiment is described by taking the moving assembly 150 including the rotating member 151 and the two elastic members 152 as an example.
[0105] The process of positioning the workpiece by the positioning fixture 100 is as follows: first, the workpiece is placed in the parallelogram structure formed by the four linkage members 120; second, the screw 1511 is driven to rotate in the forward direction by the handle 1513, and the screw 1511 pushes the corresponding clamping member 140 to move along the clamping groove 110c close to the load-bearing center 110b through the wear-resistant body 1512, and the guide member 130 on the clamping member 140 drives the two guide members 130 relatively arranged on the Y axis to slide along the guide groove 110d through the two hinged linkage members 120, so that the two guide members 130 relatively arranged on the Y axis move away from each other and compress the two elastic members 152; in the process of the two guide members 130 moving away from each other, the other clamping member 140 is driven to move close to the load-bearing center 110b by the two hinged linkage members 120 until the clamping surfaces 140a of the two clamping members 140 abut against the workpiece.
[0106] The process of removing the workpiece from the positioning fixture 100: first, the screw 1511 is driven to rotate in the opposite direction by the handle 1513, and the screw 1511 moves away from the wear-resistant body 1512. The compressed elastic force of the two elastic members 152 is released to push the two guide members 130 to approach each other along the guide groove 110d. In the process of the two guide members 130 approaching each other, the two clamping members 140 are driven away from each other by the hinged linkage member 120 until one of the clamping members 140 abuts against the wear-resistant body 1512, and the other clamping member 140 abuts against the inner wall of the mounting member 160. Finally, the workpiece located in the parallelogram structure formed by the four linkage members 120 is taken out.
[0107] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.
[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.
Claims
1. A positioning fixture, characterized in that: include: A base having a bearing surface for bearing a workpiece, wherein the bearing surface is provided with a bearing center; Four linkage members and four guide members, the four linkage members are all arranged on the bearing surface and are hinged head-to-tail through one guide member in sequence, the connecting lines of the four guide members are arranged in a parallelogram, and the intersection of the connecting lines of each two oppositely arranged guide members is arranged coaxially with the bearing center, wherein two oppositely arranged guide members are slidably mounted on the base along a first direction, and the other two oppositely arranged guide members are slidably mounted on the base along a second direction; wherein, The first direction is perpendicular to the second direction.
2. The positioning fixture according to claim 1, characterized in that: The positioning fixture also includes: Two clamping members are respectively sleeved on the two guide members arranged opposite to each other in the first direction, and the clamping members include a first connecting block and a second connecting block which are arranged at intervals along the axial direction of the guide members and sleeved on the guide members, and an abutment block connecting the first connecting block and the second connecting block, the abutment block of the first connecting block and the second connecting block protrudes toward one side of the load-bearing center to abut against the workpiece, and / or the abutment block protrudes toward one side of the load-bearing center to abut against the workpiece, and the abutment ends of the two linkage members are stacked and both accommodated between the first connecting block and the second connecting block; wherein, The first connecting block is slidably mounted on the base along the first direction.
3. The positioning fixture according to claim 2, characterized in that: The two guide members arranged opposite to each other in the second direction respectively include: A guide section and an extension section are connected in sequence, a step surface is formed between the guide section and the extension section, the guide section is slidably connected to the base, and the abutting ends of the two linkage members are stacked and arranged on the step surface; wherein, The extension section is movably arranged along a third direction through the abutting ends of the two linkage members, and the third direction is perpendicular to the first direction and the second direction.
4. The positioning fixture according to claim 1, characterized in that: The positioning fixture also includes: A mounting member, disposed on the bearing surface; A moving component is connected to the mounting component, and one end of the moving component is used to push one of the guide members to slide relative to the base along the first direction or the second direction.
5. The positioning fixture according to claim 4, characterized in that: The bearing surface is provided with a clamping groove and a guide groove arranged crosswise, the clamping groove is extended along the first direction, the guide groove is extended along the second direction and communicates with the clamping groove, and the intersection of the clamping groove and the guide groove forms the bearing center; Two of the guide members slide along the clamping grooves respectively, and the other two guide members slide and are clamped in the guide grooves respectively.
6. The positioning fixture according to claim 5, characterized in that: The mounting member is a frame-shaped structure, and the moving assembly comprises: A rotating member, rotatably connected to the mounting member, so as to push one of the guide members; Two elastic members are both received in the guide groove, and two ends of each elastic member respectively abut against the mounting member and one of the guide members.
7. The positioning fixture according to claim 6, characterized in that: The rotating member comprises: A screw rod, threadedly connected to the mounting member and corresponding to one of the guide members in the first direction; The wear-resistant body is movably received in the clamping groove and is located between the screw and the guide member corresponding to the screw.
8. The positioning fixture according to claim 6, characterized in that: The mounting member is slidably connected to the base along the first direction.
9. The positioning fixture according to claim 8, characterized in that: The bearing surface is also provided with two slide grooves respectively connected to the guide grooves at both ends of the second direction. The mounting member includes a main body and two protrusions connected to the two ends of the main body. The main body is a frame-like structure. The two protrusions are respectively slidably clamped in the two slide grooves and abutted against the two elastic members.
10. The positioning fixture according to claim 4, characterized in that: The mobile assembly comprises: A push-pull member, rotatably connected to the mounting member; A hinged member, both ends of which are rotatably connected to the push-pull member and one of the guide members, respectively, and when the push-pull member rotates, the corresponding guide member is driven to move along the first direction or the second direction through the hinged member.