Positioning jig

Abstract

The utility model provides a positioning jig which is used for positioning a small part to a workpiece so as to improve positioning accuracy, the small part comprises a front end, a connecting body and a tail end, the workpiece comprises a step frame and a fixing protrusion, and the positioning jig comprises a bearing assembly for bearing and positioning the step frame; the cover plate assembly comprises a cover plate piece, a sliding piece, an abutting piece, a positioning piece and a bending piece, the cover plate piece is movably arranged above the bearing assembly and abuts against the workpiece to the bearing assembly, the sliding piece movably penetrates through the cover plate piece and is provided with a guide groove, and the abutting piece is connected with the cover plate piece and positions the connecting body to the connecting position of the step frame and the fixed protrusion; the positioning piece movably penetrates through the sliding piece and the cover plate piece and is elastically connected with the sliding piece, the positioning piece positions the front end to the step frame, the bending piece comprises a bending body and an abutting body, the bending body movably penetrates through the sliding piece and the cover plate piece and is elastically connected with the cover plate piece, and the abutting body is arranged on the bending body in a protruding mode and abuts against the groove bottom of the guide groove. And the tail end is bent under the pushing of the bending body and is attached to the fixed bulge.

Description

TECHNICAL FIELD

[0001] The utility model relates to product positioning technical field especially relates to a positioning fixture. BACKGROUND

[0002] At present, when assembling electronic equipment, for example, positioning and pasting the conductive spring sheet on the step surface of the product frame, first, the conductive spring sheet is bent to a preset angle and pasted with double-sided adhesive tape, then the operator places the bent conductive spring sheet at the preset position of the step surface of the product frame to position the conductive spring sheet on the step surface of the product frame, finally, the operator covers the cover plate on the carrier to make the conductive spring sheet adhere to the fixing protrusion of the step surface of the product frame.

[0003] However, when the conductive spring sheet is placed at the preset position of the step surface of the product frame after bending, it is easy to make the conductive spring sheet directly adhere to the fixing protrusion of the step surface of the product frame, which affects the positioning accuracy of the conductive spring sheet, and the positioning accuracy of manually placing the conductive spring sheet at the preset position of the step surface of the product frame is low. SUMMARY

[0004] In view of the above situation, it is necessary to provide a positioning fixture to improve the positioning accuracy.

[0005] The embodiment of the application provides a positioning fixture for positioning a small piece to a workpiece, the small piece comprising a front end, a connecting body connected perpendicularly to the front end, a tail end arranged obliquely relative to the front end and connected to the connecting body, the workpiece comprising a step frame and a fixing protrusion connected, the positioning fixture comprising:

[0006] a carrier assembly for carrying and positioning the step frame; and

[0007] The cover plate assembly comprises a cover plate, a sliding piece, a pressing piece, a positioning piece and a bending piece. The cover plate is movably arranged above the bearing assembly and is used to press the workpiece to the bearing assembly along a first direction. The sliding piece is movably arranged in the cover plate along a second direction perpendicular to the first direction and is provided with a guide groove. The pressing piece is connected with the cover plate and is used to position the connecting body to the connecting position of the step frame and the fixed protrusion along the first direction. The positioning piece is movably arranged in the sliding piece and the cover plate along the first direction and is elastically connected with the sliding piece along the second direction. The positioning piece is used to position the front end to the step frame along the second direction under the driving of the sliding piece. The bending piece comprises a bending body and a resisting body. The bending body is movably arranged in the sliding piece and the cover plate along the first direction and is elastically connected with the cover plate. The resisting body is protruded on one side of the bending body and abuts against the bottom of the guide groove. The resisting body is used to drive the bending body to extend out of the cover plate under the guidance of the guide groove, so that the tail end is bent and abuts against and adheres to the fixed protrusion under the pushing of the bending body.

[0008] In actual use, the workpiece is first placed on the bearing assembly, the bearing assembly bears and positions the workpiece, the small piece is then placed at the preset position of the positioned workpiece, the cover plate is then moved close to the bearing assembly to press the workpiece to the bearing assembly along the first direction, the pressing piece is then positioned to the connecting position of the step frame and the fixed protrusion along the first direction under the driving of the cover plate, and finally the sliding piece drives the positioning piece to move along the second direction, so that the positioning piece positions the front end to the upper surface of the step frame along the second direction. The resisting body then drives the bending body to extend out of the cover plate under the guidance of the guide groove, so that the tail end is bent and abuts against and adheres to the fixed protrusion under the pushing of the bending body, thereby sequentially completing the positioning and bending operations of the small piece, avoiding the tail end of the small piece being abnormally adhered to the fixed protrusion of the workpiece to affect the positioning operation of the small piece, and improving the positioning accuracy.

[0009] In some embodiments, the cover plate comprises a cover plate body and a fixing body. The cover plate body is movably arranged above the bearing assembly and is provided with a containing groove and a through hole. The containing groove is arranged on the side of the cover plate body away from the bearing assembly. The through hole is arranged at the bottom of the containing groove and penetrates through the cover plate body. The fixing body is arranged on the containing groove and is detachably connected with the cover plate body. The fixing body is provided with a through hole which penetrates through the fixing body and corresponds to the through hole.

[0010] The sliding member comprises a sliding body, a first elastic body and a driving cam, the sliding body is slidably arranged in the accommodating groove along the second direction and elastically connected with the positioning member, the sliding body is provided with the guide slot and a communication slot, the communication slot penetrates through the sliding body and cooperates with the through hole and the through hole to form a light transmission channel for receiving external laser light, two ends of the first elastic body are elastically abutted against the sliding body and the groove wall of the accommodating groove respectively, the driving cam is movably arranged in the cover body along the first direction and extends to the accommodating groove, the driving cam is rotationally connected with the sliding body, and the driving cam is used to drive the sliding body to slide along the second direction and compress the first elastic body to the groove wall of the accommodating groove, so as to drive the positioning member and the bending body to move in sequence.

[0011] In some embodiments, the abutting member comprises an abutting body, a supporting body and a second elastic body, the abutting body is movably arranged in the cover body and the sliding member along the first direction and is arranged around the through hole, two ends of the second elastic body are elastically abutted against the abutting body and the fixed body respectively, the second elastic body is used to drive the abutting body to extend out of the cover body to position the connecting body to the connecting position of the stepped frame and the fixed protrusion, and the supporting body is protrudingly arranged on one side of the abutting body and located in the accommodating groove, and the supporting body is used to abut against the groove bottom of the accommodating groove to support the abutting body.

[0012] In some embodiments, the sliding body comprises a sliding part and a connecting part, the sliding part is slidably arranged in the accommodating groove along the second direction and is provided with the guide slot and the communication slot, the connecting part is correspondingly arranged with the positioning member along the first direction and covers part of the communication slot, and the connecting part is connected with the sliding part and is provided with a pushing slot.

[0013] The positioning member comprises a moving body, a third elastic body and a positioning body, the moving body is slidably arranged in the cover body along the second direction and located in the communication slot, the moving body is away from the driving cam of the abutting member along the second direction and is provided with a placement slot, the placement slot is arranged in a staggered manner with the pushing slot and is communicated with the pushing slot, the third elastic body is received in the placement slot, and the positioning body is movably arranged in the through hole along the first direction and is connected with the moving body, the sliding part is used to drive the connecting part to move along the second direction to be close to the first elastic body, so that the pushing slot abuts against the third elastic body to the groove wall of the driving cam away from the groove wall of the driving cam, so as to drive the moving body and the positioning body to move along the second direction.

[0014] In some embodiments, the cover plate assembly further comprises a pressing member, the pressing member comprising a pressing body, a fourth elastic body and a movable body, the pressing body movably penetrating the positioning member, the sliding body and the cover plate body along the first direction, two ends of the fourth elastic body elastically abutting the pressing body and the fixed body respectively, one end of the movable body being connected with the pressing body, and the other end of the movable body movably penetrating the positioning member along a third direction, the first direction, the second direction and the third direction being perpendicular to each other;

[0015] The sliding body is further provided with a guide groove for accommodating the movable body, the guide groove comprising a first plane, a guide inclined surface and a second plane, the guide inclined surface being obliquely arranged relative to the first plane and being connected with the first plane and the second plane respectively, the first plane being away from the bearing assembly relative to the second plane along the first direction, the first plane being away from the drive cam relative to the second plane along the second direction, and the guide groove being used for guiding the movable body and the abutting body in sequence under the driving of the sliding body and the guide groove, so that the movable body is moved from the first plane to the second plane under the guidance of the guide inclined surface, and the pressing body is extended out of the cover plate body under the driving of the fourth elastic body, so as to press the front end to the step frame along the first direction.

[0016] In some embodiments, the bending body comprises a linkage body, an elastic part and a bending part, the linkage body movably penetrating the sliding member and being connected with the abutting body along the first direction, the linkage body being adjacent to the drive cam relative to the abutting member along the second direction, two ends of the elastic part elastically abutting the linkage body and the fixed body respectively, and the bending part being protruded on one side of the linkage body facing the abutting member and being located on one side of the fixed body facing the bearing assembly.

[0017] The guide groove comprises a sliding plane, a guide inclined surface and an abutting plane, the guide inclined surface being obliquely arranged relative to the sliding plane and being connected with the sliding plane and the abutting plane respectively, the sliding plane being away from the bearing assembly relative to the abutting plane along the first direction, and the sliding plane being away from the drive cam along the second direction, and the guide inclined surface being used for guiding the abutting body to move from the sliding plane to the abutting plane, so that the linkage body drives the bending part to bend the tail end under the driving of the elastic part.

[0018] In some embodiments, the bearing assembly comprises:

[0019] a bearing member oppositely arranged with the cover plate member along the first direction, the bearing member being used for bearing the step frame;

[0020] A reference member is provided on the side of the bearing member facing the cover plate member and is connected to the reference member;

[0021] A pushing member, which is slidably disposed on the bearing member and correspondingly disposed to the reference member; and

[0022] A rotating cam is rotatably connected to the pusher. The rotating cam is used to drive the pusher to move the step frame closer to the reference member under the action of an external force, so as to position the step frame to the reference member.

[0023] In some embodiments, the carrier component further includes:

[0024] A rotating component, one end of which is rotatably connected to the bearing component, and the other end of which is provided with a retaining protrusion. The retaining protrusion is used to abut against the upper surface of the cover plate under the drive of the rotating component, so as to hold the cover plate against the bearing component.

[0025] In some embodiments, the carrier assembly further includes a guide, the guide comprising:

[0026] A fixing block is disposed on the support member adjacent to the reference member;

[0027] A guide body, rotatably connected to the fixed block and provided with a guide groove, is used to rotate toward the rotating cam under the action of an external force, so that the guide groove guides the small part to be placed in a preset position on the stepped frame; and

[0028] A magnetic attractor is embedded in the side of the fixing block away from the support member, and the magnetic attractor is used to magnetically attract the guide body after it has rotated.

[0029] In some embodiments, the support member has a guide hole on the side facing the cover plate member, and the cover plate assembly further includes a guide post. The guide post is connected to the cover plate member and is correspondingly disposed with respect to the guide hole. The guide post is used to be inserted into the guide hole under the drive of the cover plate member to guide the pressing member, the positioning member and the bending member. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the positioning fixture and workpiece provided in the embodiments of this application.

[0031] Figure 2 for Figure 1 The diagram shows a three-dimensional structure of the workpiece and small parts that are adapted to the positioning fixture.

[0032] Figure 3 for Figure 2 The diagram shows a partial enlarged view of the workpiece and smaller parts at position III.

[0033] Figure 4 for Figure 1 the structural exploded schematic view of the cover assembly shown.

[0034] Figure 5 for Figure 4 the sectional view of the sliding body shown along the V-V direction.

[0035] Figure 6 for Figure 1 the structural exploded schematic view of the bearing assembly shown.

[0036] Main element symbol explanation: positioning jig 100, bearing assembly 10, bearing 11, support 111, accommodating groove 1111, mounting groove 1112, bearing body 112, positioning protrusion 113, guide protrusion 114, guide hole 115, reference 12, first reference body 121, second reference body 122, pushing piece 13, first sliding plate 131, device groove 1311, second sliding plate 132, first inclined groove 1321, configuration groove 1322, connecting shaft 133, first pushing body 134, second pushing body 135, fifth elastic body 136, sixth elastic body 137, rotating cam 14, rotating piece 15, abutting protrusion 151, guide 16, fixed block 161, guide body 162, guide groove 1621, magnetic attraction body 163, plug-in piece 17, cover assembly 20, cover piece 21, cover body 211, accommodating groove 2111, through hole 2112, assembly groove 2113, abutting groove 2114, avoidance groove 2115, fixed body 212, through hole 2121, sliding piece 22, guide groove 221, sliding plane 2211, guide inclined surface 2212, abutting plane 2213, sliding body 222, communication groove 2221, sliding part 2222, connecting part 2223, pushing groove 2224, guide groove 2225, first plane 2225a, guide inclined surface 2225b, second plane 2225c, second inclined groove 2226, driving cam 223, first elastic body 224, light transmission through groove 225, abutting piece 23, abutting body 231, supporting body 232, second elastic body 233, positioning piece 24, moving body 241, seating groove 2411, third elastic body 242, positioning body 243, bending piece 25, bending body 251, linkage body 2511, elastic part 2512, bending part 2513, abutting body 252, pressing piece 26, pressing body 261, fourth elastic body 262, movable body 263, guide column 27, stop piece 28, movable groove 281, linkage protrusion 282, elastic piece 29, small piece 200, front end 201, connecting body 202, tail end 203, workpiece 300, step frame 301, fixed protrusion 302, hollow structure 303, bottom shell 304. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0038] In the description of the present application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which are only for the purpose of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, it should be noted that the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection or can communicate with each other, it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0040] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0041] Please refer to Figure 1 and Figure 2 The embodiment of the present application provides a positioning jig 100, which comprises a bearing assembly 10 and a cover plate assembly 20, and the positioning jig 100 is used for positioning a small piece 200 to a workpiece 300. Please refer to Figure 2 and Figure 3 Wherein, the small piece 200 comprises a front end 201, a connecting body 202 connected perpendicularly to the front end 201, a tail end 203 arranged obliquely relative to the front end 201 and connected to the connecting body 202, the workpiece 300 comprises a stepped frame 301, a fixed protrusion 302 and a bottom shell 304, the bottom shell 304 covers the stepped frame 301, the fixed protrusion 302 is protruding on the inner side of the stepped frame 301, and the small piece 200 can be a conductive element, etc. for example, and the workpiece 300 can be a mobile phone shell, a watch shell, a tablet shell, a sound box shell, etc.

[0042] For the convenience of understanding and illustrating the embodiments of the present application, a three-dimensional coordinate system is established in some of the drawings, the first direction is the Z-axis direction as shown in Figure 1 , the second direction is the X-axis direction as shown in Figure 1 , and the third direction is the Y-axis direction as shown in Figure 1 . The first direction, the second direction and the third direction are perpendicular to each other.

[0043] Please refer to Figure 1 , Figure 4 and Figure 5 . The carrying assembly 10 is used for carrying and positioning the workpiece 300. The cover assembly 20 includes a cover member 21, a sliding member 22, a pressing member 23, a positioning member 24 and a bending member 25. The cover member 21 is movably arranged above the carrying assembly 10 and is used for pressing the workpiece 300 to the carrying assembly 10 along the first direction. The sliding member 22 is movably arranged in the cover member 21 along the second direction and is provided with a guide groove 221. The pressing member 23 is connected with the cover member 21. The pressing member 23 is used for positioning the connecting body 202 to the connecting position of the step frame 301 and the fixed protrusion 302 along the first direction. The positioning member 24 is movably arranged in the sliding member 22 and the cover member 21 along the first direction and is elastically connected with the sliding member 22 along the second direction. The positioning member 24 is used for positioning the front end 201 to the upper surface of the step frame 301 along the second direction under the driving of the sliding member 22. The bending member 25 includes a bending body 251 and a bearing body 252. The bending body 251 is movably arranged in the sliding member 22 and the cover member 21 along the first direction and is elastically connected with the cover member 21. The bearing body 252 is protrudingly arranged on one side of the bending body 251 and abuts against the groove bottom of the guide groove 221. The bearing body 252 is used for driving the bending body 251 to extend out of the cover member 21 under the guidance of the guide groove 221, so that the tail end 203 is bent and abuts against and adheres to the fixed protrusion 302 under the pushing of the bending body 251.

[0044] The positioning jig 100 described above is used in practice as follows. First, the workpiece 300 is placed on the bearing assembly 10, the bearing assembly 10 bears and positions the workpiece 300, then the small piece 200 is placed at the preset position of the positioned workpiece 300, then the cover member 21 is moved close to the bearing assembly 10 to press the workpiece 300 to the bearing assembly 10 in the first direction, the pressing member 23 is driven by the cover member 21 to position the connecting body 202 to the connecting position of the stepped frame 301 and the fixed protrusion 302 in the first direction, finally, the sliding member 22 drives the positioning member 24 to move in the second direction, so that the positioning member 24 positions the front end 201 to the upper surface of the stepped frame 301 in the second direction, the abutting body 252 drives the bending body 251 to extend out of the cover member 21 under the guidance of the guide groove 221, so that the tail end 203 is bent and pasted to the fixed protrusion 302 under the pushing of the bending body 251, realizing the positioning and bending of the small piece 200 in sequence, avoiding the tail end 203 of the small piece 200 being pasted to the fixed protrusion 302 of the workpiece 300 in dislocation, affecting the positioning of the small piece 200, and improving the positioning accuracy.

[0045] It can be understood that the fixed protrusion 302 is pre-coated with a colloid, so that the bent tail end 203 is attached to the fixed protrusion 302.

[0046] Please refer to Figure 4 In some embodiments, the cover member 21 comprises a cover body 211 and a fixed body 212, the cover body 211 is movably arranged above the bearing assembly 10 and is provided with a containing groove 2111 and a through hole 2112, the containing groove 2111 is arranged on the side of the cover body 211 away from the bearing assembly 10, the through hole 2112 is arranged at the groove bottom of the containing groove 2111 and penetrates the cover body 211, the fixed body 212 is arranged on the containing groove 2111 and is detachably connected with the cover body 211, the fixed body 212 is provided with a through hole 2121, the through hole 2121 penetrates the fixed body 212 and is correspondingly arranged with the through hole 2112.

[0047] The sliding member 22 comprises a sliding body 222, a first elastic body 224 and a driving cam 223. The sliding body 222 is slidably arranged in the accommodating groove 2111 in the second direction and elastically connected with the positioning member 24. The sliding body 222 is provided with a guide groove 221 and a communicating groove 2221. The communicating groove 2221 penetrates through the sliding body 222 and cooperates with the penetrating hole 2112 and the through hole 2121 to form a light-transmitting groove 225 for receiving external laser light. The two ends of the first elastic body 224 are elastically abutted against the sliding body 222 and the groove wall of the accommodating groove 2111, respectively. The driving cam 223 is movably arranged in the cover body 211 in the first direction and extends into the accommodating groove 2111. The driving cam 223 is rotationally connected with the sliding body 222. The driving cam 223 is used to drive the sliding body 222 to slide in the second direction and compress the first elastic body 224 against the groove wall of the accommodating groove 2111, so as to drive the positioning member 24 and the bending body 251 to move in sequence. Exemplarily, the first elastic body 224 can be a spring, and the driving cam 223 can be an eccentric cam with a handle.

[0048] Thus, by arranging the specific structures of the cover member 21 and the sliding member 22, the driving cam 223 is rotated relative to the sliding body 222 under the action of external force, so as to drive the sliding body 222 to slide in the second direction and compress the first elastic body 224 against the groove wall of the accommodating groove 2111. In this way, the positioning member 24 and the bending body 251 are driven to move in sequence, thereby realizing the positioning and bending operations of the small piece 200 in sequence. In addition, by arranging the communicating groove 2221 to cooperate with the penetrating hole 2112 and the through hole 2121 to form the light-transmitting groove 225, the laser light emitted by the external laser equipment can be irradiated to the predetermined area of the small piece 200, i.e. the front end 201 of the small piece 200 in the embodiment, which is beneficial to stably weld the small piece 200 to the workpiece 300.

[0049] Please continue to refer to Figure 4 In some embodiments, the abutting member 23 comprises an abutting body 231, a supporting body 232 and a second elastic body 233. The abutting body 231 movably penetrates through the cover body 211 and the sliding member 22 in the first direction and is arranged around the penetrating hole 2112. The two ends of the second elastic body 233 are elastically abutted against the abutting body 231 and the fixed body 212, respectively. The second elastic body 233 is used to drive the abutting body 231 to extend out of the cover body 211 to position the connecting body 202 at the connecting position of the step frame 301 and the fixed protrusion 302. The supporting body 232 is protrudingly arranged on one side of the abutting body 231 and located in the accommodating groove 2111. The supporting body 232 is used to abut against the groove bottom of the accommodating groove 2111 to support the abutting body 231. Exemplarily, the second elastic body 233 can be a spring.

[0050] Thus, by setting the specific structure of the abutting member 23, the abutment body 232 abuts against the groove bottom of the accommodating groove 2111 to support the abutting body 231, preventing the abutting body 231 from being separated from the cover plate member 21, so that the abutting body 231 is abutted against the connection between the connecting body 202 and the step frame 301 and the fixing protrusion 302 under the driving of the cover plate member 21, and the second elastic body 233 is compressed to the fixing body 212 by the abutting body 231, realizing the flexible abutting of the abutting member 23 to the connection between the connecting body 202 and the step frame 301 and the fixing protrusion 302, avoiding the damage of the small piece 200 and the workpiece 300 caused by the excessive force applied by the abutting body 231 to the connecting body 202, and being beneficial to improve the positioning stability and the product quality of the small piece 200 and the workpiece 300.

[0051] Please refer to Figure 4 and Figure 5 In some embodiments, the sliding body 222 includes a sliding part 2222 and a connecting part 2223, the sliding part 2222 is arranged in the accommodating groove 2111 along the second direction and is provided with a guide groove 221 and a communication groove 2221, the connecting part 2223 is arranged corresponding to the positioning member 24 along the first direction and covers part of the communication groove 2221, and the connecting part 2223 is connected with the sliding part 2222 and is provided with a pushing groove 2224.

[0052] The positioning member 24 includes a moving body 241, a third elastic body 242, and a positioning body 243, the moving body 241 is arranged in the cover plate body 211 along the second direction and is located in the communication groove 2221, the moving body 241 is away from the driving cam 223 along the second direction relative to the abutting member 23 and is provided with a seating groove 2411, the seating groove 2411 is arranged in a staggered manner with the pushing groove 2224 and is communicated with the pushing groove 2224, the third elastic body 242 is received in the seating groove 2411, the positioning body 243 is movably arranged in the through hole 2112 along the first direction and is connected with the moving body 241, and the sliding part 2222 is used to drive the connecting part 2223 to move along the second direction to make the pushing groove 2224 abut against the groove wall of the driving cam 223 to press the third elastic body 242 away from the groove wall of the driving cam 223 in the seating groove 2411, so as to drive the moving body 241 and the positioning body 243 to move along the second direction. Exemplarily, the third elastic body 242 can be a spring.

[0053] Thus, due to the misalignment and communication between the installation groove 2411 and the pushing groove 2224, when the sliding part 2222 is in the initial position, the pushing groove 2224 abuts against the third elastic body 242 to the installation groove 2411 adjacent to the groove wall of the driving cam 223, when the sliding part 2222 is driven by the driving cam 223 to move along the second direction to the first elastic body 224, the pushing groove 2224 abuts against the third elastic body 242 to the installation groove 2411 away from the groove wall of the driving cam 223 under the driving of the sliding part 2222, so as to drive the third elastic body 242 to move the moving body 241 and the positioning body 243 along the second direction, thereby realizing the function of positioning the front end 201 to the step frame 301 by the positioning body 243.

[0054] Please refer to Figure 4 and Figure 5 In some embodiments, the cover plate assembly 20 further comprises a pressing member 26, the pressing member 26 comprising a pressing body 261, a fourth elastic body 262 and a movable body 263, the pressing body 261 movably penetrating the positioning member 24, the sliding body 222 and the cover plate body 211 along the first direction, the two ends of the fourth elastic body 262 elastically abutting against the pressing body 261 and the fixed body 212 respectively, one end of the movable body 263 being connected with the pressing body 261, and the other end of the movable body 263 movably penetrating the positioning member 24 along the third direction. The sliding body 222 is further provided with a guide groove 2225 for accommodating the movable body 263, the guide groove 2225 comprising a first plane 2225a, a guide inclined surface 2225b and a second plane 2225c, the guide inclined surface 2225b being obliquely arranged relative to the first plane 2225a and being connected with the first plane 2225a and the second plane 2225c respectively, the first plane 2225a being away from the bearing assembly 10 along the first direction relative to the second plane 2225c, the first plane 2225a being away from the driving cam 223 along the second direction relative to the second plane 2225c, the guide groove 2225 being used for guiding the movable body 263 and the abutting body 252 in sequence under the driving of the sliding body 222, so as to make the movable body 263 move from the first plane 2225a to the second plane 2225c under the guidance of the guide inclined surface 2225b, and make the pressing body 261 extend out of the cover plate body 211 under the driving of the fourth elastic body 262, so as to press the front end 201 to the upper surface of the step frame 301 along the first direction. Exemplarily, the fourth elastic body 262 can be a spring.

[0055] Thus, by setting the specific structure of the pressing member 26 and the guide slot 2225, before the bending body 251 extends out of the cover plate body 211, the guide slot 2225 guides the movable body 263 under the driving of the sliding body 222, so that the movable body 263 is guided by the guide slope 2225b to move from the first plane 2225a to the second plane 2225c, and the pressing body 261 is driven by the fourth elastic body 262 to extend out of the cover plate body 211 to press the front end 201 to the upper surface of the step frame 301 in the first direction, avoiding the front end 201 from being raised when the tail end 203 is bent by the bending body 251 due to uneven force, ensuring that the positioning jig 100 stably positions the small piece 200 to the preset position of the workpiece 300 before bending, and facilitating the bending body 251 to stably bend the tail end 203.

[0056] Please continue to refer to Figure 4 and Figure 5 In some embodiments, the bending body 251 includes a linkage body 2511, an elastic part 2512, and a bending part 2513. The linkage body 2511 is movably arranged in the sliding member 22 and connected with the abutting body 252 in the first direction, the linkage body 2511 is adjacent to the driving cam 223 relative to the pressing member 23 in the second direction, the two ends of the elastic part 2512 are elastically abutted with the linkage body 2511 and the fixed body 212 respectively, and the bending part 2513 is protrudingly arranged on the side of the linkage body 2511 facing the pressing member 23 and located on the side of the fixed body 212 facing the bearing assembly 10. The guide slot 221 includes a sliding plane 2211, a guide slope 2212, and an abutting plane 2213. The guide slope 2212 is obliquely arranged relative to the sliding plane 2211 and connected with the sliding plane 2211 and the abutting plane 2213 respectively. The sliding plane 2211 is away from the bearing assembly 10 relative to the abutting plane 2213 in the first direction, and the sliding plane 2211 is away from the driving cam 223 in the second direction. The guide slope 2212 is used to guide the abutting body 252 to move from the sliding plane 2211 to the abutting plane 2213, so that the linkage body 2511 drives the bending part 2513 to bend the tail end 203 under the driving of the elastic part 2512. Exemplarily, the elastic part 2512 can be a spring.

[0057] Thus, by setting the specific structure of the bending body 251 and the guide slot 221, after the small piece 200 is positioned to the preset position of the workpiece 300, the guide slope 2212 guides the abutting body 252 to move from the sliding plane 2211 to the abutting plane 2213 under the driving of the sliding body 222, so that the linkage body 2511 drives the bending part 2513 to bend the tail end 203 under the driving of the elastic part 2512, realizing the positioning and bending operations of the small piece 200 to be completed in sequence.

[0058] Please refer to Figure 1 and Figure 6In some embodiments, the bearing assembly 10 comprises a bearing 11, a reference 12, a pushing member 13 and a rotating cam 14. The bearing 11 is disposed opposite to the cover 21 along a first direction, and is configured to bear the workpiece 300. The reference 12 is disposed on a side of the bearing 11 facing the cover 21 and is connected to the reference 12. The pushing member 13 is slidingly disposed on the bearing 11 and is disposed corresponding to the reference 12. The rotating cam 14 is rotationally connected to the pushing member 13. The rotating cam 14 is configured to drive the pushing member 13 to push the step frame 301 to move close to the reference 12 from the side under the action of an external force, so as to position the step frame 301 to the reference 12. The rotating cam 14 can be an eccentric cam, for example.

[0059] In this way, by setting the specific structure of the bearing assembly 10, the rotating cam 14 is rotated under the action of an external force, so that the rotating cam 14 drives the pushing member 13 to push the step frame 301 to move close to the reference 12, so as to position the step frame 301 borne by the bearing 11 to the reference 12, thereby achieving the function of positioning the workpiece 300.

[0060] Please refer to Figure 6 In some embodiments, the bearing 11 comprises a support 111, a bearing body 112, a positioning protrusion 113 and a guide protrusion 114. The support 111 is disposed below the cover 21. A continuous accommodating groove 1111 and a mounting groove 1112 are disposed on a side of the support 111 facing the cover 21. The accommodating groove 1111 and the mounting groove 1112 extend along a second direction and a third direction, respectively. The bearing body 112 covers part of the accommodating groove 1111 and part of the mounting groove 1112 and is detachably connected to the support 111. The positioning protrusion 113 and the guide protrusion 114 are disposed on the support 111 in a spaced manner. The positioning protrusion 113 is configured to position the bottom shell 304 to a preset orientation. The guide protrusion 114 is configured to guide the bottom shell 304 to be placed on the bearing body 112.

[0061] The pushing member 13 comprises a first sliding plate 131, a second sliding plate 132, a connecting shaft 133, a first pushing body 134, a second pushing body 135, a fifth elastic body 136 and a sixth elastic body 137. The first sliding plate 131 is slidingly arranged in the accommodating groove 1111 in the second direction and is rotationally connected with the rotating cam 14, and the first sliding plate 131 is provided with a device groove 1311. The second sliding plate 132 is arranged in a stack with the first sliding plate 131 and is slidingly arranged in the mounting groove 1112 in the third direction. The second sliding plate 132 is provided with a first inclined groove 1321 and a configuration groove 1322. One end of the connecting shaft 133 is connected with the first sliding plate 131, and the other end of the connecting shaft 133 is movably arranged in the first inclined groove 1321. The first pushing body 134 is slidingly arranged in the device groove 1311 and extends out of the upper surface of the bearing body 112. The second pushing body 135 is slidingly arranged in the configuration groove 1322 and extends out of the upper surface of the bearing body 112. The two ends of the fifth elastic body 136 are elastically abutted against the first pushing body 134 and the groove wall of the device groove 1311 respectively. The two ends of the sixth elastic body 137 are elastically abutted against the second pushing body 135 and the groove wall of the configuration groove 1322 respectively. The reference member 12 comprises a first reference body 121 and a second reference body 122, and the first reference body 121 and the second reference body 122 are correspondingly arranged with the first pushing body 134 and the second pushing body 135 respectively and are both connected with the support body 111. Exemplarily, the fifth elastic body 136 and the sixth elastic body 137 can be springs.

[0062] In this way, by arranging the specific structures of the bearing member 11, the pushing member 13 and the reference member 12, first, the bottom shell 304 is moved to the bearing member 11 under the guidance of the guide protrusion 114, the positioning protrusion 113 positions the bottom shell 304 to a preset orientation, then the rotating cam 14 is rotated under the action of an external force and drives the first sliding plate 131 to slide in the second direction, and finally the first sliding plate 131 compresses the fifth elastic body 136 to the first pushing body 134, so that the first pushing body 134 pushes the stepped frame 301 to the first reference body 121 in the second direction, and at the same time, the connecting shaft 133 pushes the groove wall of the first inclined groove 1321 under the driving of the first sliding plate 131, so that the second sliding plate 132 compresses the sixth elastic body 137 to the second pushing body 135, so that the second pushing body 135 pushes the stepped frame 301 to the second reference body 122 in the third direction, thereby realizing the function of positioning the stepped frame 301 in the second direction and the third direction at the same time.

[0063] Please refer to Figure 2 It can be understood that the bottom shell 304 has a hollow structure 303, and the positioning protrusion 113 is inserted into the hollow structure 303 to position the orientation of the bottom shell 304, so as to avoid placing the bottom shell 304 in the opposite direction.

[0064] Please refer to Figure 1 and Figure 6In some embodiments, the bearing assembly 10 further comprises a rotating member 15, one end of the rotating member 15 is rotatably connected with the bearing member 11, and the other end of the rotating member 15 is provided with an abutting protrusion 151 for abutting against the upper surface of the cover plate member 21 under the driving of the rotating member 15, so as to abut the cover plate member 21 to the bearing member 11.

[0065] In this way, by arranging the rotating member 15, the rotating member 15 is driven to rotate synchronously under the action of an external force, so that the abutting protrusion 151 abuts against the upper surface of the cover plate member 21 to abut the cover plate member 21 to the bearing member 11, and the cover plate member 21 is stably pressed against the workpiece 300 to the bearing member 11, thereby avoiding the cover plate member 21 from shaking during positioning and bending, and ensuring the positioning and bending accuracy.

[0066] Please refer to Figure 6 In some embodiments, the bearing assembly 10 further comprises a guide member 16, the guide member 16 comprises a fixed block 161, a guide body 162 and a magnetic body 163. The fixed block 161 is arranged on the bearing member 11 adjacent to the reference member 12, the guide body 162 is rotatably connected with the fixed block 161 and is provided with a guide groove 1621, and the guide body 162 is used for rotating towards the rotating cam 14 under the action of an external force, so that the guide groove 221 guides the small piece 200 to be placed at the preset position of the stepped frame 301. The magnetic body 163 is embedded on the side of the fixed block 161 away from the bearing member 11, and the magnetic body 163 is used for magnetically attracting the rotating guide body 162. Exemplarily, the magnetic body 163 can be a magnet.

[0067] In this way, when it is needed to place the small piece 200 at the preset position of the stepped frame 301, the guide body 162 is rotated towards the rotating cam 14 under the action of an external force, and the magnetic body 163 magnetically attracts the rotating guide body 162, so that the guide groove 1621 of the guide body 162 corresponds to the preset position of the workpiece 300, and the small piece 200 is accurately placed at the preset position of the stepped frame 301 under the guidance of the guide groove 1621, which is beneficial for subsequent positioning of the small piece 200.

[0068] It can be understood that the upper surface of the stepped frame 301 is provided with a placing groove (not shown in the figure), and the placing groove is used for accommodating part of the front end 201 of the small piece 200. However, the depth dimension of the placing groove along the first direction is small, and therefore, in the present embodiment, the guide groove 1621 is in communication with the placing groove after the guide body 162 is rotated towards the rotating cam 14, so as to facilitate the front end 201 of the small piece 200 to be placed in the placing groove.

[0069] Please refer to Figure 4 and Figure 6In some embodiments, the carrier 11 is provided with a guide hole 115 on the side facing the cover plate 21, and the cover plate assembly 20 further comprises a guide post 27 connected to the cover plate 21 and arranged in correspondence with the guide hole 115, the guide post 27 being used to be inserted into the guide hole 115 under the driving of the cover plate 21 to guide the abutting piece 23, the positioning piece 24 and the bending piece 25.

[0070] In this way, by arranging the guide post 27 and the guide hole 115, when the cover plate 21 moves close to the carrier 11, the guide post 27 is inserted into the guide hole 115 to guide the abutting piece 23, the positioning piece 24 and the bending piece 25, so as to avoid misalignment of the abutting piece 23, the positioning piece 24 and the bending piece 25 with the to-be-operated area of the small piece 200, and ensure that the cover plate assembly 20 accurately positions and bends the small piece 200.

[0071] Please refer to Figure 1 , Figure 4 and Figure 6 In some embodiments, the carrier assembly 10 further comprises an insertion piece 17 arranged on the carrier 11 in correspondence with the guide hole 115. The sliding body 222 is provided with a second inclined slot 2226, and the cover plate body 211 is provided with an assembly slot 2113, an abutting slot 2114 and an avoiding slot 2115. The assembly slot 2113 extends along the second direction and is in communication with the accommodating slot 2111. The abutting slot 2114 is arranged on the bottom of the assembly slot 2113 and is in communication with the assembly slot 2113. The avoiding slot 2115 is arranged in correspondence with the insertion piece 17 and is in communication with the assembly slot 2113. The cover plate assembly 20 further comprises a stopper 28 and an elastic piece 29. The stopper 28 is arranged in the assembly slot 2113 along the third direction and is provided with a movable slot 281 and a linkage protrusion 282. The movable slot 281 penetrates through the stopper 28 along the first direction. The linkage protrusion 282 is protruded from the side of the stopper 28 facing away from the cover plate body 211 and is inserted into the second inclined slot 2226. The two ends of the elastic piece 29 are respectively elastically abutted against the slot wall of the movable slot 281 and the slot wall of the abutting slot 2114. Exemplarily, the elastic body can be a spring.

[0072] Thus, by setting the above-mentioned insertion piece 17, stop piece 28 and elastic piece 29, when the driving cam 223 is in the initial position, the elastic piece 29 provides elastic force to drive the linkage protrusion 282 to drive the stop piece 28 away from the avoidance slot 2115, avoiding the stop piece 28 from blocking the avoidance slot 2115, so that the cover plate piece 21 can be covered on the bearing piece 11, so that the insertion piece 17 is inserted in the avoidance slot 2115, facilitating subsequent positioning and bending operations of the cover plate assembly 20; when the cover plate piece 21 is covered on the bearing piece 11, the driving cam 223 is rotated under the action of external force to drive the sliding piece 22 to move, the stop piece 28 is abutted on the peripheral side of the insertion piece 17 by the slot wall of the second inclined slot 2226 and compresses the elastic piece 29 to abut on the slot wall of the slot 2114; when the cover plate piece 21 is separated from the bearing piece 11 and the driving cam 223 is in the position after rotation, at this time the cover plate assembly 20 is in the working state, the pressing piece 26 and the bending piece 25 are all extended out of the cover plate piece 21, the stop piece 28 is compressed by the slot wall of the second inclined slot 2226 to abut on the slot wall of the slot 2114 and block the avoidance slot 2115, so that the stop piece 28 stops the insertion piece 17 from being inserted in the avoidance slot 2115, thereby avoiding the operator from placing the cover plate piece 21 in the working state on the bearing piece 11 due to operation error, causing the pressing piece 26 and the bending piece 25 to collide with the small piece 200.

[0073] The working process of the above-mentioned positioning jig 100 is as follows:

[0074] Firstly, the workpiece 300 is placed on the bearing piece 11, the cam 14 is rotated under the action of external force and drives the pushing piece 13 to push the stepped frame 301 close to the reference piece 12 to move, so that the pushing piece 13 positions the stepped frame 301 to the reference piece 12, the guide body 162 is rotated under the action of external force towards the rotating cam 14, and the magnetic attraction body 163 magnetically attracts the rotated guide body 162, so that the guide slot 1621 of the guide body 162 corresponds to the preset position of the workpiece 300, and then the small piece 200 is accurately placed in the preset position of the stepped frame 301 under the guidance of the guide slot 1621;

[0075] Then, the cover plate piece 21 moves close to the bearing piece 11 and presses the stepped frame 301 to the bearing piece 11 along the first direction, the abutting piece 23 is positioned to the stepped frame 301 along the first direction under the driving of the cover plate piece 21, the rotating piece 15 is rotated under the action of external force to abut the abutting protrusion 151 on the upper surface of the cover plate piece 21, so that the abutting protrusion 151 abuts the cover plate piece 21 to the bearing piece 11 along the first direction;

[0076] Finally, the driving cam 223 rotates under the action of external force and drives the sliding body 222 to move in the second direction, so that the positioning member 24 positions the front end 201 to the step frame 301 in the second direction, and the pressing member 26 is guided by the guide groove 2225 to press the front end 201 to the step frame 301 in the first direction, then the abutting body 252 drives the bending body 251 to extend out of the cover plate member 21 under the guidance of the guide groove 221, so that the tail end 203 is bent and pasted to the fixed protrusion 302 under the pushing of the bending body 251, realizing the positioning and bending operations of the small piece 200 in turn, avoiding the tail end 203 of the small piece 200 being pasted together with the fixed protrusion 302 of the workpiece 300 in a wrong position, affecting the positioning operation of the small piece 200, and further improving the positioning accuracy.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A positioning jig for positioning a small piece to a workpiece, the small piece comprising a front end, a connecting body connected perpendicularly to the front end, a tail end disposed obliquely with respect to the front end and connected to the connecting body, and the workpiece comprising a stepped frame and a fixing protrusion connected, characterized in that, The positioning jig comprises: a bearing assembly for bearing and positioning the stepped frame; and a cover plate assembly comprising a cover plate member, a sliding member, a pressing member, a positioning member and a bending member, the cover plate member is movably arranged above the bearing assembly and is used for pressing a workpiece to the bearing assembly along a first direction, the sliding member is movably arranged in the cover plate member along a second direction perpendicular to the first direction and is provided with a guide groove, the pressing member is connected with the cover plate member, the pressing member is used for positioning the connecting body to a connecting position between the stepped frame and the fixed protrusion along the first direction, the positioning member is movably arranged in the sliding member and the cover plate member along the first direction and is elastically connected with the sliding member along the second direction, the positioning member is used for positioning the front end to the stepped frame along the second direction under the driving of the sliding member, the bending member comprises a bending body and a bearing body, the bending body is movably arranged in the sliding member and the cover plate member along the first direction and is elastically connected with the cover plate member, the bearing body is protruded on one side of the bending body and abuts against the bottom of the guide groove, and the bearing body is used for driving the bending body to extend out of the cover plate member under the guidance of the guide groove, so that the tail end is bent and abuts against and adheres to the fixed protrusion under the pushing of the bending body.

2. The positioning fixture of claim 1, wherein The cover plate member comprises a cover plate body and a fixing body, the cover plate body is movably arranged above the bearing assembly and is provided with a receiving groove and a through hole, the receiving groove is arranged on a side of the cover plate body away from the bearing assembly, the through hole is arranged on the bottom of the receiving groove and penetrates through the cover plate body, and the fixing body is detachably connected with the cover plate body and covers the receiving groove, the fixing body is provided with a through hole, and the through hole penetrates through the fixing body and is correspondingly arranged with the through hole; The sliding member comprises a sliding body, a first elastic body and a driving cam, the sliding body is slidably arranged in the receiving groove along the second direction and is elastically connected with the positioning member, the sliding body is provided with the guide groove and a communication groove, the communication groove penetrates through the sliding body and forms a light transmission groove for receiving external laser light in cooperation with the through hole and the through hole, two ends of the first elastic body are elastically abutted against the sliding body and the groove wall of the receiving groove respectively, the driving cam is movably arranged in the cover plate body along the first direction and extends to the receiving groove, the driving cam is rotationally connected with the sliding body, and the driving cam is used for driving the sliding body to slide along the second direction and compressing the first elastic body to the groove wall of the receiving groove, so as to drive the positioning member and the bending body to move in sequence.

3. The positioning fixture of claim 2, wherein The pressing member comprises a pressing body, a supporting body and a second elastic body. The pressing body is movably arranged in the first direction through the cover plate body and the sliding member and is arranged around the through hole. Two ends of the second elastic body are elastically abutted to the pressing body and the fixed body respectively. The second elastic body is used to drive the pressing body to extend out of the cover plate body to position the connecting body to the connecting position of the step frame and the fixed protrusion. The supporting body is protruded on one side of the pressing body and is located in the accommodating groove. The supporting body is used to abut to the groove bottom of the accommodating groove to support the pressing body.

4. The positioning fixture of claim 2, wherein The sliding body comprises a sliding part and a connecting part. The sliding part is slidably arranged in the accommodating groove along the second direction and is provided with the guide groove and the communicating groove. The connecting part is correspondingly arranged with the positioning member along the first direction and covers part of the communicating groove. The connecting part is connected with the sliding part and is provided with a pushing groove. The positioning member comprises a moving body, a third elastic body and a positioning body. The moving body is slidably arranged in the cover plate body along the second direction and is located in the communicating groove. The moving body is away from the driving cam relative to the pressing member along the second direction and is provided with a placing groove. The placing groove is arranged in a staggered manner with the pushing groove and is communicated with the pushing groove. The third elastic body is received in the placing groove. The positioning body is movably arranged in the through hole along the first direction and is connected with the moving body. The sliding part is used to drive the connecting part to move along the second direction to approach the first elastic body, so that the pushing groove is adjacent to the groove wall of the driving cam to abut the third elastic body to the groove wall of the driving cam away from the driving cam to drive the moving body and the positioning body to move along the second direction.

5. The positioning fixture of claim 2, wherein The cover plate assembly further comprises a pressing member. The pressing member comprises a pressing body, a fourth elastic body and a movable body. The pressing body is movably arranged in the first direction through the positioning member, the sliding body and the cover plate body. Two ends of the fourth elastic body are elastically abutted to the pressing body and the fixed body respectively. One end of the movable body is connected with the pressing body. The other end of the movable body is movably arranged in the positioning member along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The sliding body is further provided with a guide groove for receiving the movable body. The guide groove comprises a first plane, a guide inclined surface and a second plane. The guide inclined surface is arranged in a tilted manner relative to the first plane and is connected with the first plane and the second plane respectively. The first plane is away from the bearing assembly relative to the second plane along the first direction. The first plane is away from the driving cam relative to the second plane along the second direction. The guide groove is used to guide the movable body and the abutting body in sequence under the driving of the sliding body and the guide groove, so that the movable body is moved from the first plane to the second plane under the guidance of the guide inclined surface. The pressing body is extended out of the cover plate body under the driving of the fourth elastic body to press the front end to the step frame along the first direction.

6. The positioning fixture of claim 2, wherein The bending body comprises a linkage body, an elastic part and a bending part. The linkage body is movably arranged in the sliding member along the first direction and connected with the abutting body. The linkage body is adjacent to the driving cam relative to the abutting member along the second direction. The elastic part has two ends respectively elastically abutting the linkage body and the fixed body. The bending part is protruded on the side of the linkage body facing the abutting member and located on the side of the fixed body facing the bearing assembly. The guide groove comprises a sliding plane, a guide inclined plane and an abutting plane. The guide inclined plane is arranged obliquely relative to the sliding plane and connected with the sliding plane and the abutting plane respectively. The sliding plane is away from the bearing assembly relative to the abutting plane along the first direction. The sliding plane is away from the driving cam along the second direction. The guide inclined plane is used to guide the abutting body to move from the sliding plane to the abutting plane, so that the linkage body drives the bending part to bend the tail end under the driving of the elastic part.

7. The positioning fixture of claim 1, wherein The bearing assembly comprises: a bearing member oppositely arranged with the cover member along the first direction, the bearing member being used to bear the step frame; a reference member arranged on the side of the bearing member facing the cover member and connected with the reference member; a pushing member slidingly arranged in the bearing member and correspondingly arranged with the reference member; and a rotating cam rotationally connected with the pushing member, the rotating cam being used to drive the pushing member to side-push the step frame to move close to the reference member under the action of an external force, so as to position the step frame to the reference member.

8. The positioning fixture of claim 7, wherein The bearing assembly further comprises: a rotating member, one end of the rotating member being rotationally connected with the bearing member, the other end of the rotating member being provided with an abutting protrusion, the abutting protrusion being used to abut on the upper surface of the cover member under the driving of the rotating member, so as to abut the cover member to the bearing member.

9. The positioning fixture of claim 7, wherein The bearing assembly further comprises a guide member, the guide member comprising: a fixed block arranged on the bearing member adjacent to the reference member; a guide body rotationally connected with the fixed block and provided with a guide groove, the guide body being used to rotate towards the rotating cam under the action of an external force, so that the guide groove guides the small member to be placed in the preset position of the step frame; and a magnetic attraction body embedded on the side of the fixed block away from the bearing member, the magnetic attraction body being used to magnetically attract the rotating guide body.

10. The positioning fixture of claim 7, wherein The side of the bearing member facing the cover member is provided with a guide hole. The cover assembly further comprises a guide column connected with the cover member and correspondingly arranged with the guide hole. The guide column is used to be inserted in the guide hole under the driving of the cover member, so as to guide the abutting member, the positioning member and the bending member.

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