CN216188598U

CN216188598U - Jig transverse moving mechanism

Info

Publication number: CN216188598U
Application number: CN202122482179.7U
Authority: CN
Inventors: 宾兴; 王金军; 黄宗运
Original assignee: Shenzhen Sinvo Automatic Co Ltd
Current assignee: Shenzhen Sinvo Automatic Co Ltd
Priority date: 2021-10-15
Filing date: 2021-10-15
Publication date: 2022-04-05
Anticipated expiration: 2031-10-15

Abstract

The utility model discloses a jig transverse moving mechanism which comprises a transverse moving base, a driving assembly, a transverse moving support plate, a transverse moving single slide rail and a jig positioning mechanism, wherein the transverse moving base is horizontally arranged between two automatic assembly lines, two sides of the transverse moving base are provided with vertically upward support bars, and an installation space is formed between the two support bars so as to install a screw rod; the driving component is arranged on the transverse moving base; the transverse support plate is slidably embedded on the transverse base; the transverse single sliding rail is arranged at the top of the transverse support plate, a conveyor belt is horizontally arranged at the side part of the transverse support plate, and the height of the conveyor belt is lower than that of the transverse single sliding rail; a jig is slidably embedded on the transverse single sliding rail, a material carrier is placed on the jig, and the bottom of the jig is tightly pressed on the conveying belt under the action of gravity; the jig positioning mechanism is arranged on the side part of the transverse support plate and blocks the positioning jig. The utility model realizes automatic access, lifting and positioning prevention, jig transfer and sliding delivery of the jig, and effectively improves jig transfer efficiency.

Description

Jig transverse moving mechanism

Technical Field

The utility model relates to the field of automatic production, in particular to a jig transverse moving mechanism for automatic feeding and material assembling and processing of an automatic production line.

Background

The automatic production device has the advantages that the automatic production device can automatically complete various production and processing by replacing manual work with machines, and in the field of automatic equipment, because a produced product generally consists of a plurality of scattered parts, in the actual production process, various parts need to be automatically assembled through equipment, so that a complete product structure is formed. Therefore, the ubiquitous production process for automatic assembly and processing of various materials is applied to multiple fields, and the production requirements for automatic assembly of the materials are met for various intelligent terminal devices, products such as mobile phones, tablet computers, intelligent watches, batteries and power supplies, various daily products and toys. Because the types and specifications of materials in the automatic assembly process are different, the existing automatic assembly technology generally adopts respective assembly equipment aiming at different materials, and standardized universal assembly equipment is difficult to form.

For the automatic assembly of materials, because different materials need to be assembled, the assembled materials such as various electronic components and base materials such as PCB boards are involved; therefore, the automatic material assembling process integrally comprises three process sections, namely an automatic material loading process of the assembled material, a material loading process of the substrate material and an automatic assembling process of the assembled material and the substrate material.

In the loading process of the base material, a jig is generally used as a device carrier, the jig clamps the base material, and then the base material is conveyed to an assembly station, and the assembled material is taken out by an assembly manipulator and then automatically assembled on the base material. After the jig clamps the base material, generally directly transport the jig to the assembly station of production line through the transport mechanism after, the assembly manipulator assembles the material to the base material, and the jig drives the base material to move to next station after the assembly is accomplished, until the material is assembled. In the actual assembly process, when a plurality of assembly lines are required to be arranged according to different assembly processes or an entire assembly line is required to be divided into a plurality of unit assembly lines according to site factors, a jig is required to be automatically transferred among the unit assembly lines. The jig involves the problems of the insertion and the ejection of the jig, the positioning of the jig and the transmission failure of the jig in the transfer process of different assembly lines.

In addition, to the tool of single track transmission, the tool freely inlays and establishes after on the slide rail, push down through the gravity of tool self and set up on the transmission band of slide rail one side, the static friction power drive tool through tool and transmission band moves forward, to this kind of transmission mode, after the tool location, because the station on the whole production line is arranged a lot, consequently need the transmission band to keep constantly transmitting the state forward, make tool and transmission band break away from when just needing the location in single station assembling process, in order to avoid constantly rubbing between the fixed tool bottom of transmission band in the motion and location, consequently need design tool positioning mechanism in order to satisfy above-mentioned technological requirement to this kind of structure.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art and provides a jig transverse moving mechanism which realizes automatic access, lifting and positioning prevention, jig transfer and sliding delivery of a jig and effectively improves jig transfer efficiency.

The technical scheme adopted by the utility model is as follows: a jig transverse moving mechanism comprises a transverse moving base, a driving assembly, a transverse moving support plate, a transverse moving single slide rail and a jig positioning mechanism, wherein the transverse moving base is horizontally arranged between two automatic assembly lines, two sides of the transverse moving base are provided with vertically upward support bars, and an installation space is formed between the two support bars so as to install a screw rod; the driving assembly is arranged on the transverse moving base; the transverse support plate is slidably embedded on the transverse base and is connected with the output end of the driving assembly, and the driving assembly drives the transverse support plate to linearly move back and forth; the transverse single sliding rail is arranged at the top of the transverse support plate, a conveyor belt is horizontally arranged on the side part of the transverse support plate, the height of the conveyor belt is lower than that of the transverse single sliding rail, the conveyor belt is tensioned by a roller arranged on the side wall of the transverse support plate, and the roller is driven by a motor to rotate so as to drive the conveyor belt to linearly move; a jig is slidably embedded on the transverse single slide rail, a material carrier is placed on the jig, the bottom of the jig is tightly pressed on the conveying belt through the action of gravity, and the conveying belt drives the jig to linearly move along the transverse single slide rail; the jig positioning mechanism is arranged on the side part of the transverse support plate, and the jig positioning mechanism blocks the positioning jig.

Preferably, a transverse moving slide rail is arranged at the top of the supporting strip of the transverse moving base; the transverse support plate is slidably embedded on the transverse sliding rail.

Preferably, the driving motor comprises a traverse motor, a screw rod and a screw rod seat, wherein the slidable screw rod is arranged in the installation space of the traverse base; the transverse moving motor is connected to one end of the transverse moving base, and the output end of the transverse moving motor is connected with the screw rod to drive the screw rod to rotate; the screw rod seat is sleeved on the screw rod and is in threaded connection with the screw rod, the screw rod seat is connected to the bottom of the transverse support plate, and the transverse support plate is driven to linearly move back and forth along the transverse slide rail when the screw rod rotates forwards and reversely.

Preferably, the jig positioning mechanism is arranged on one side of the transverse moving support plate so as to position the jig on the transverse moving single slide rail.

Preferably, the jig positioning mechanism comprises a positioning support, a positioning cylinder, a positioning slide seat, a positioning connecting block, a positioning spring column, a first inclined ejector block, a second inclined ejector block, a positioning groove and a stop block, wherein the positioning support is vertically arranged on the side part of the single slide rail; the positioning cylinder is vertically arranged on one side of the positioning support, and the output end of the positioning cylinder is arranged downwards; the positioning sliding seat is connected to the other side wall of the positioning support in a sliding manner along the vertical direction; one end of the positioning connecting block is connected to the output end of the positioning air cylinder, the other end of the positioning connecting block penetrates through the positioning support and horizontally extends to the other side of the positioning support, the positioning air cylinder is connected with the positioning sliding seat, and the positioning air cylinder drives the positioning sliding seat to move up and down through the positioning connecting block.

Preferably, the positioning spring column is vertically arranged, and the lower end of the positioning spring column is connected to the positioning sliding seat and vertically extends upwards.

Preferably, the first inclined ejecting block and the second inclined ejecting block are respectively arranged on the top and the outer side wall of the positioning sliding seat, the first inclined ejecting block is vertically connected to the upper end of the positioning spring column, the tops of the first inclined ejecting block and the second inclined ejecting block are respectively provided with a first inclined plane and a second inclined plane, the first inclined plane extends upwards in an inclined mode along the movement direction of the jig, and the inclined direction of the second inclined plane is opposite to that of the first inclined plane; the top end of the first inclined plane is provided with an inward-sunken positioning groove, and the side wall of the positioning groove, which is far away from the movement direction of the jig, extends upwards to the position above the first inclined plane; the blocking block is vertically arranged on the side wall of the positioning groove far away from the movement direction of the jig; when the jig moves linearly to the jig positioning mechanism, the stop block stops the jig carrier on the upper layer of the jig, under the action of inertia, the tool base at the lower layer of the tool continues to drive the first roller and the second roller which are arranged at the side parts of the tool base to move along the first inclined plane and the second inclined plane of the first inclined ejecting block and the second inclined plane respectively, the acting force of the first roller on the first inclined plane downwards compresses the positioning spring column to ensure that the first inclined ejecting block descends until the first roller moves to the top end of the first inclined plane and then downwards slides into the positioning groove, the rebound force of the positioning spring column upwards pushes the first inclined ejecting block to move upwards, the first inclined ejecting block drives the second inclined ejecting block to upwards eject the second roller, the second roller upwards applies an upward acting force to the jig base to lift the jig base upwards, the bottom of the jig base is separated from the conveying belt on one side of the single sliding rail, and the static friction force transmission between the conveying belt and the jig base is disabled.

The utility model has the beneficial effects that:

aiming at the defects and shortcomings in the prior art, the jig transverse moving mechanism is independently researched and developed, the jig is automatically connected, lifted and positioned, transferred and slidably sent out, and the transferring efficiency of the jig is effectively improved.

The automatic transfer device is suitable for automatic transfer of the jig for bearing materials among a plurality of automatic assembly line bodies. The jig is designed aiming at the process requirement that the jig transfers among different automatic assembly line bodies, a transverse moving base horizontally arranged between a first line body and a second line body is used as a bearing structure, two transverse moving slide rails are arranged on the transverse moving base in parallel at intervals, a transverse moving support plate is connected to the transverse moving slide rails in a sliding mode, a transverse moving single slide rail is arranged at the top of the transverse moving support plate, a conveying belt is arranged on one side of the transverse moving single slide rail, the bottom of the transverse moving support plate is connected with a screw rod arranged between the two transverse moving slide rails through a screw rod seat, and a transverse moving motor arranged at one end of the transverse moving base drives the transverse moving support plate to move back and forth between the first line body and the second line body through driving the screw rod to rotate back and forth. One side of the transverse support plate is provided with a jig positioning mechanism. When the transverse support plate moves to one side of the first line body, the transverse single slide rail is in butt joint with the single slide rail of the first line body, the jig slides into the transverse single slide rail from the first line body and is blocked and positioned by the jig positioning mechanism, the transverse support drives the jig to move to one side of the second line body, and the jig is driven to slide into the single slide rail of the second line body through the movement of the conveyor belt at the side part of the transverse single slide rail, so that automatic jig connection, jig positioning, transverse jig transfer and jig transfer are realized.

The jig positioning mechanism is designed aiming at the jig in the single-rail conveying mode and has the effects of blocking and positioning the jig which is driven by the static friction force of the conveying belt and conveyed linearly, and enabling the jig to be separated from the conveying belt upwards, so that the phenomenon that the conveying belt which still moves continuously rubs with the bottom of the jig after the jig blocks and stops moving is avoided, and the service lives of the jig and the conveying belt are influenced. The jig positioning mechanism takes the vertically arranged positioning support as a bearing structure, the whole jig positioning mechanism only comprises one power output component, namely the positioning air cylinder, the air cylinder drives the positioning slide seat to move up and down, the positioning air cylinder and the positioning slide seat are respectively vertically arranged on two sides of the positioning support in the structural design, and the output end of the positioning air cylinder and the positioning slide seat are connected through the positioning connecting block with the lower part penetrating through the positioning support, so that the space is effectively utilized, and the overall space occupancy rate is reduced. Particularly, the top of the positioning sliding seat is connected with a first inclined ejecting block through a vertically arranged positioning spring, and the internal stress of the positioning spring is greater than that of a connecting spring of the jig; the side wall of the first inclined ejecting block is connected with a second inclined ejecting block, and the end wall of the positioning sliding seat is connected with a blocking pillar; the top parts of the first inclined ejecting block and the second inclined ejecting block are respectively provided with a first inclined surface and a second inclined surface which have opposite inclined directions, wherein the top part of the first inclined surface is provided with a downward sunken positioning groove, and the width of the positioning groove is greater than the outer diameter of the first roller; the side wall of the positioning groove far away from the movement direction of the jig extends upwards to the top of the first inclined plane, and a blocking block is arranged on the side wall. When the jig moves to the jig positioning mechanism, the stop block stops the jig carrier on the upper layer of the jig, the jig carrier stops moving, the lower base of the jig continues to move forwards due to inertia, the first roller slides upwards along the first inclined surface, the first inclined ejecting block presses down the positioning spring until the first roller slides to the top of the first inclined surface, the first inclined ejecting block falls downwards into the positioning groove, the first inclined ejecting block loses the downward pressure of the first roller, the rebound force of the positioning spring pushes the second inclined ejecting block upwards to ascend, the second inclined surface on the top of the second inclined ejecting block props against the second roller of the jig, and the second roller is lifted upwards, the second roller drives the base to overcome the internal stress of the connecting spring to move upwards, the bottom of the base is separated from the conveyor belt, and meanwhile, when the base moves upwards, the flexible connection of the limiting swing block enables the distance between the base and the jig carrier to be shortened. Through the structure design, the lifting of the jig is completed while the movement of the jig is blocked through one power output, so that the transmission between the jig and the conveyor belt is failed, and the assembly and the processing are facilitated.

Drawings

Fig. 1 is a schematic perspective view of a traverse mechanism according to the present invention.

Fig. 2 is a schematic perspective view of the second embodiment of the traverse mechanism of the present invention.

Fig. 3 is a third schematic perspective view of the traverse mechanism of the present invention.

FIG. 4 is a fourth schematic perspective view of the traverse mechanism of the present invention.

Fig. 5 is a schematic perspective view of a blocking mechanism of a jig according to the present invention.

Fig. 6 is a schematic perspective view of a second stopping mechanism of the jig of the present invention.

Fig. 7 is a third schematic perspective view of a blocking mechanism of a jig according to the present invention.

Fig. 8 is a fourth schematic view of the three-dimensional structure of the blocking mechanism of the jig of the present invention.

Detailed Description

The utility model will be further described with reference to the accompanying drawings in which:

as shown in fig. 1 to 8, the technical solution adopted by the present invention is as follows: a jig transverse moving mechanism comprises a transverse moving base 71, a driving assembly, a transverse moving support plate 74, a transverse moving single slide rail 75 and a jig positioning mechanism 9, wherein the transverse moving base 71 is horizontally arranged between two automatic assembly lines, two sides of the transverse moving base 71 are provided with vertically upward support bars, and an installation space is formed between the two support bars so as to install a screw rod; the driving component is arranged on the transverse moving base 71; the transverse support plate 74 is slidably embedded on the transverse base 71 and is connected with the output end of the driving component, and the driving component drives the transverse support plate 74 to do linear motion back and forth; the transverse moving single slide rail 75 is arranged at the top of the transverse moving support plate 74, a conveyor belt is horizontally arranged at the side part of the transverse moving support plate 74, the height of the conveyor belt is lower than that of the transverse moving single slide rail 75, the conveyor belt is tensioned by rollers arranged on the side wall of the transverse moving support plate 74, and the rollers are driven by a motor to rotate so as to drive the conveyor belt to linearly move; a jig is slidably embedded on the transverse single slide rail 75, a material carrier 6 is placed on the jig, the bottom of the jig is pressed against the conveyor belt under the action of gravity, and the conveyor belt drives the jig to linearly move along the transverse single slide rail 75; the jig positioning mechanism 9 is disposed on the side of the lateral moving support plate 74, and the jig positioning mechanism 9 blocks the positioning jig.

The top of the branch of the transverse moving base 71 is provided with a transverse moving slide rail 72; the cross brace 74 is slidably engaged with the cross slide 72.

The driving motor comprises a traverse motor 73, a screw rod and a screw rod seat, wherein the slidable screw rod is arranged in the installation space of the traverse base 71; the transverse moving motor 73 is connected with one end of the transverse moving base 71, and the output end of the transverse moving motor is connected with the screw rod to drive the screw rod to rotate; the screw rod seat is sleeved on the screw rod and is in threaded connection with the screw rod, the screw rod seat is connected to the bottom of the transverse support plate 74, and the transverse support plate 74 is driven to linearly move back and forth along the transverse slide rail 72 when the screw rod rotates forwards and reversely.

The jig positioning mechanism 9 is provided on one side of the traverse support plate 74 to position the jig on the traverse single slide rail 75.

The jig positioning mechanism 9 comprises a positioning support 91, a positioning cylinder 92, a positioning slide carriage 93, a positioning connecting block 94, a positioning spring column 95, a first inclined ejector block 96, a second inclined ejector block 97, a positioning groove 98 and a stop block 99, wherein the positioning support 91 is vertically arranged on the side part of the single slide rail; the positioning cylinder 92 is vertically arranged at one side of the positioning support 91, and the output end is arranged downwards; the positioning slide seat 93 is slidably connected to the other side wall of the positioning support 91 along the vertical direction; one end of the positioning connection block 94 is connected to the output end of the positioning cylinder 92, the other end of the positioning connection block 94 passes through the positioning support 91 and horizontally extends to the other side of the positioning support 91 and is connected with the positioning sliding seat 93, and the positioning cylinder 92 drives the positioning sliding seat 93 to move up and down through the positioning connection block 94.

The positioning spring column 95 is vertically arranged, and the lower end of the positioning spring column 95 is connected to the positioning slide carriage 93 and vertically extends upwards.

The first inclined ejecting block 96 and the second inclined ejecting block 97 are respectively arranged on the top and the outer side wall of the positioning sliding seat 93, the first inclined ejecting block 96 is vertically connected to the upper end of the positioning spring column 95, the tops of the first inclined ejecting block 96 and the second inclined ejecting block 97 are respectively provided with a first inclined plane and a second inclined plane, the first inclined plane extends upwards in an inclined mode along the movement direction of the jig, and the inclined direction of the second inclined plane is opposite to that of the first inclined plane; the top end of the first inclined plane is provided with an inward-concave positioning groove 98, and the side wall of the positioning groove 98 far away from the movement direction of the jig extends upwards to the position above the first inclined plane; the stop block 99 is vertically arranged on the side wall of the positioning groove 98 far away from the movement direction of the jig; when the jig moves linearly to the jig positioning mechanism 9, the stop block 99 stops the jig carrier on the upper layer of the jig, due to the inertia effect, the jig base at the lower layer of the jig continues to drive the first roller and the second roller arranged at the side parts of the jig base to move along the first inclined plane and the second inclined plane of the first inclined ejecting block 96 and the second inclined plane 97 respectively, the acting force of the first roller on the first inclined plane downwards compresses the positioning spring column, so that the first inclined ejecting block 96 descends until the first roller moves to the top end of the first inclined plane and then slides downwards into the positioning groove 98, the resilience of the positioning spring column 95 pushes the first inclined ejecting block 96 upwards to move, the first inclined ejecting block 96 drives the second inclined ejecting block 97 to jack the second roller upwards, the second roller provides an upward acting force for the jig base to lift the jig base upwards, so that the bottom of the jig base is separated from the conveyor belt on one side of the single slide rail, and the transmission of static friction force between the conveyor belt and the jig base is disabled.

Further, the utility model designs a jig transverse moving mechanism which realizes automatic insertion, lifting and positioning prevention, jig transfer and sliding delivery of the jig and effectively improves jig transfer efficiency.

The embodiments of the present invention are merely illustrative of specific embodiments thereof, and are not intended to limit the scope thereof. Since the present invention can be modified by a person skilled in the art, the present invention is not limited to the embodiments described above.

Claims

1. The utility model provides a tool sideslip mechanism which characterized in that: the automatic assembling line comprises a transverse moving base (71), a driving assembly, a transverse moving support plate (74), a transverse moving single slide rail (75) and a jig positioning mechanism (9), wherein the transverse moving base (71) is horizontally arranged between two automatic assembling lines, two sides of the transverse moving base (71) are provided with vertically upward support bars, and an installation space is formed between the two support bars so as to install a screw rod; the driving component is arranged on the transverse moving base (71); the transverse moving support plate (74) is slidably embedded on the transverse moving base (71) and is connected with the output end of the driving component, and the driving component drives the transverse moving support plate (74) to move linearly back and forth; the transverse single sliding rail (75) is arranged at the top of the transverse support plate (74), a conveyor belt is horizontally arranged on the side part of the transverse support plate (74), the height of the conveyor belt is lower than that of the transverse single sliding rail (75), the conveyor belt is tensioned by a roller arranged on the side wall of the transverse support plate (74), and the roller is driven by a motor to rotate so as to drive the conveyor belt to linearly move; a jig is slidably embedded on the transverse single sliding rail (75), a material carrier (6) is placed on the jig, the bottom of the jig is pressed against the conveying belt under the action of gravity, and the conveying belt drives the jig to linearly move along the transverse single sliding rail (75); the jig positioning mechanism (9) is arranged on the side part of the transverse moving support plate (74), and the jig positioning mechanism (9) blocks the positioning jig.

2. The jig traversing mechanism according to claim 1, wherein: the top of the branch of the transverse moving base (71) is provided with a transverse moving slide rail (72); the traverse support plate (74) is slidably embedded in the traverse slide rail (72).

3. The jig traversing mechanism according to claim 2, wherein: the driving assembly comprises a transverse moving motor (73), a screw rod and a screw rod seat, wherein the slidable screw rod is arranged in an installation space of the transverse moving base (71); the transverse moving motor (73) is connected to one end of the transverse moving base (71), and the output end of the transverse moving motor is connected with the screw rod to drive the screw rod to rotate; the screw rod seat is sleeved on the screw rod and is in threaded connection with the screw rod, the screw rod seat is connected to the bottom of the transverse support plate (74), and the transverse support plate (74) is driven to linearly move back and forth along the transverse slide rail (72) when the screw rod rotates forwards and reversely.

4. The jig traversing mechanism according to claim 3, wherein: the jig positioning mechanism (9) is arranged on one side of the transverse moving support plate (74) so as to position the jig on the transverse moving single slide rail (75).

5. The jig traversing mechanism according to claim 4, wherein: the jig positioning mechanism (9) comprises a positioning support (91), a positioning cylinder (92), a positioning sliding seat (93), a positioning connecting block (94), a positioning spring column (95), a first inclined ejector block (96), a second inclined ejector block (97), a positioning groove (98) and a blocking block (99), wherein the positioning support (91) is vertically arranged on the side part of the single sliding rail; the positioning cylinder (92) is vertically arranged on one side of the positioning support (91), and the output end of the positioning cylinder is arranged downwards; the positioning sliding seat (93) is connected to the other side wall of the positioning support (91) in a sliding manner along the vertical direction; one end of the positioning connecting block (94) is connected to the output end of the positioning air cylinder (92), the other end of the positioning connecting block (94) penetrates through the positioning support (91) to horizontally extend to the other side of the positioning support (91) and is connected with the positioning sliding seat (93), and the positioning air cylinder (92) drives the positioning sliding seat (93) to move up and down through the positioning connecting block (94).

6. The jig traversing mechanism according to claim 5, wherein: the positioning spring column (95) is vertically arranged, and the lower end of the positioning spring column (95) is connected to the positioning sliding seat (93) and vertically extends upwards.

7. The jig traversing mechanism according to claim 6, wherein: the first inclined ejecting block (96) and the second inclined ejecting block (97) are respectively arranged on the top and the outer side wall of the positioning sliding seat (93), the first inclined ejecting block (96) is vertically connected to the upper end of the positioning spring column (95), the tops of the first inclined ejecting block (96) and the second inclined ejecting block (97) are respectively provided with a first inclined plane and a second inclined plane, the first inclined plane extends upwards in an inclined mode along the movement direction of the jig, and the inclined direction of the second inclined plane is opposite to that of the first inclined plane; the top end of the first inclined plane is provided with an inward sunken positioning groove (98), and the side wall of the positioning groove (98) far away from the movement direction of the jig extends upwards to the position above the first inclined plane; the blocking block (99) is vertically arranged on the side wall of the positioning groove (98) far away from the movement direction of the jig; when the jig moves linearly to the jig positioning mechanism (9), the stop block (99) stops the jig carrier on the upper layer of the jig, the jig base on the lower layer of the jig continues to drive the first roller and the second roller arranged on the side parts of the jig base to move along the first inclined plane and the second inclined plane of the first inclined ejecting block (96) and the second inclined plane (97) respectively due to the inertia effect, the positioning spring column is compressed downwards by the action force of the first roller on the first inclined plane, so that the first inclined ejecting block (96) descends, after the first roller slides downwards into the positioning groove (98) when moving to the top end of the first inclined plane, the counter-elastic force of the positioning spring column (95) pushes the first inclined ejecting block (96) upwards to move, the first inclined ejecting block (96) drives the second inclined ejecting block (97) upwards to jack the second roller, the jig base is lifted upwards by the upwards action force of the second roller on the base, so that the bottom of the jig base is separated from the conveyor belt on one side, the transmission of the static friction force between the conveyor belt and the jig base is disabled.