CN214354822U

CN214354822U - Treadmill printing machine

Info

Publication number: CN214354822U
Application number: CN202022302803.6U
Authority: CN
Inventors: 肖翔宇; 肖和
Original assignee: Guangdong Tengyulong Automation Equipment Co Ltd
Current assignee: Guangdong Tengyulong Automation Equipment Co Ltd
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2021-10-08
Anticipated expiration: 2030-10-15

Abstract

The utility model relates to the technical field of printing machines, in particular to a running platform printing machine, which comprises a frame, a workbench arranged on the surface of the frame, a running platform track arranged around the workbench, a transmission component driven on the running platform track, a first supporting component arranged on the transmission component, a second supporting component arranged on the transmission component and opposite to the first supporting component, a printing component arranged on the transmission component, and a positioning component arranged on the first supporting component; the utility model discloses a run a structure, accessible transmission structure follows and runs a track transmission, holds up the silk screen location of printing usefulness through two sets of layer board subassembly cooperation locating component in the transmission process, prints through the product of printing subassembly on to the workstation later, realizes the transmission printing, and degree of automation is high, uses manpower sparingly.

Description

Treadmill printing machine

Technical Field

The utility model relates to a printing machine technical field especially relates to a race platform printing machine.

Background

Traditional walking stage silk screen printing machine can not satisfy the demand of silica gel silk screen printing, and the silica gel printing is at the printing in-process, because silica gel oil has certain viscosity and thickness, at the printing in-process, scraper dynamics or highly all realize the regulation of scraper height through manual regulation scraper cylinder nut. In repeated printing for many times, the manual adjustment has low efficiency, each adjustment precision is difficult to accurately control, and adjustment can be carried out by experienced staff, so that human resources are wasted, and the production cost is increased; in addition, due to the viscosity of the silica gel oil, a screen lifting cylinder of the current screen printing machine is fixedly connected with the screen plate, and the screen lifting cylinders on two sides act together to vertically lift the screen plate after printing is finished.

Because the screen printing process needs to be positioned, the existing screen positioning printing effect cannot meet the requirements, and therefore the existing screen printing machine cannot meet the automation of silica gel screen printing and is still manually operated in many times.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an adopted and run a structure, accessible transmission structure follows and runs a track transmission, holds up the silk screen location of printing usefulness through two sets of layer board subassembly cooperation locating component in the transmission process, prints through the product of printing subassembly on to the workstation afterwards, realizes the transmission printing, and degree of automation is high, the platform printing machine that runs who uses manpower sparingly.

The utility model adopts the technical proposal that: a running platform printing machine comprises a rack, a workbench arranged on the surface of the rack, a running platform rail arranged around the workbench, a transmission assembly transmitted to the running platform rail, a first supporting assembly arranged on the transmission assembly, a second supporting assembly arranged on the transmission assembly and opposite to the first supporting assembly, a printing assembly erected on the transmission assembly, and a positioning assembly arranged on the first supporting assembly;

the printing component comprises two groups of straight line modules which are arranged in parallel on the transmission component, a printing driving module which is erected between the two straight line modules and a printing scraper which is connected to the driving end of the printing driving module, wherein the printing scraper faces towards the workbench.

The running platform track is further improved by being provided with a track groove, and the transmission assembly comprises a base, universal wheels arranged on the base, a transmission wheel set arranged on the base and used for transmitting to the track groove, and a running platform driving assembly arranged on one side of the base.

The running platform driving assembly comprises a buffering movable seat arranged on the base, a running platform driving seat arranged on the buffering movable seat, a running platform driving motor arranged on the running platform driving seat and a driving wheel in driving connection with the running platform driving motor; and a rotating shaft is arranged between the buffer movable seat and the running platform driving seat and is connected with the running platform driving seat.

The further improvement of the scheme is that the base is positioned on one side of the printing assembly and is provided with a drying assembly, and the drying assembly comprises a drying box, a drying lamp arranged on the drying box and a drying heat dissipation fan arranged on the drying box.

The first lifting assembly comprises a first support arranged on the base, a first lifting module arranged on the first support, a first adjusting assembly arranged on the first support and positioned on the first lifting module, and a first supporting plate arranged on the first lifting module and connected with the first adjusting assembly; the second lifting assembly comprises a second support, a second lifting module arranged on the second support, a second adjusting assembly arranged on the second support and positioned on the second lifting module, and a second supporting plate arranged on the second lifting module and connected with the second adjusting assembly, and the first lifting module is provided with a pressure sensor.

The first lifting module comprises a first lifting motor arranged on the first support, a first screw rod in driving connection with the first lifting motor, a first lifting plate connected to the first screw rod, and a first lifting guide rail arranged between the first lifting plate and the first support, wherein the first supporting plate is arranged on the first lifting plate;

the further improvement of the scheme is that the pressure sensor is arranged between the first lifting guide rail and the first lifting plate;

the further improvement of the above scheme is that the first adjusting assembly comprises a first adjusting guide rail mounted on the first support, a first adjusting seat driven by the first adjusting guide rail, and a first movable guide rail mounted on the first adjusting seat, the first supporting plate is mounted on the first movable guide rail, the first support is provided with a first adjusting handle, the first support corresponds to the first adjusting handle and is provided with a first adjusting groove, and the first adjusting handle penetrates through the first adjusting groove and is connected with the first adjusting seat.

The further improvement of the scheme is that the first supporting plate comprises a first connecting plate connected with the first lifting plate and a first buffer spring arranged between the first lifting plate and the first supporting plate, the first supporting plate is at least provided with two groups, a limiting block is installed on at least one group of first supporting plate, and a limiting wheel is installed on the limiting block.

The further improvement of the scheme is that the second lifting module comprises a second lifting motor arranged on the second support, a second screw rod in driving connection with the second lifting motor, a second lifting plate connected to the second screw rod, and a second lifting guide rail arranged between the second lifting plate and the second support, and the second supporting plate is arranged on the second lifting plate;

the further improvement of the scheme is that the second lifting plate is provided with a compressing and positioning module, the compressing and positioning module comprises a compressing and fixing plate, a compressing and moving plate hinged to the compressing and fixing plate and a compressing wheel arranged on the compressing and moving plate, and a compressing spring is arranged between the compressing and moving plate and the second support and connected with the second support.

The further improvement of the scheme is that the second adjusting assembly comprises a second adjusting guide rail arranged on a second support, a second adjusting seat driven by the second adjusting guide rail and a second movable guide rail arranged on the second adjusting seat, the second supporting plate is arranged on the second movable guide rail, the second support is provided with a second adjusting handle, the second support is provided with a second adjusting groove corresponding to the second adjusting handle, and the second adjusting handle penetrates through the second adjusting groove and is connected with the second adjusting seat;

the further improvement of the above scheme is that the second supporting plate comprises a second connecting plate connected with the second lifting plate and a second buffer spring arranged between the second lifting plate and the second supporting plate, and the second supporting plate is at least provided with two groups.

The further improvement of the scheme is that the positioning assembly comprises a positioning motor, a positioning screw rod connected to the driving end of the positioning motor, a positioning movable block connected to the positioning screw rod, and a contact induction block installed on the positioning movable block, and a contact inductor is installed on one side of the first support corresponding to the contact induction block.

The utility model has the advantages that:

compare traditional printing machine, the utility model discloses a run a structure, accessible transmission structure follows and runs a track transmission, holds up the silk screen location of printing usefulness through two sets of layer board subassembly cooperation locating component in the transmission process, and the product on the workstation is printed through the printing subassembly to the back, realizes the transmission printing, and degree of automation is high, uses manpower sparingly. The printing machine comprises a rack, a workbench arranged on the surface of the rack, a running table track arranged around the workbench, a transmission assembly transmitted on the running table track, a first supporting assembly arranged on the transmission assembly, a second supporting assembly arranged on the transmission assembly and opposite to the first supporting assembly, a printing assembly erected on the transmission assembly, and a positioning assembly arranged on the first supporting assembly; two sets of layer board subassembly adopts relative setting, can be steady hold up the silk screen to print the product, print effectually, still have the locating component to detect the location to the product, conveniently print, degree of automation is high.

Wherein, the printing subassembly includes two sets of sharp modules that set up side by side in transmission assembly, erects the printing drive module between two sharp modules and connects in the printing scraper blade of printing drive module drive end, the printing scraper blade is towards the workstation, specifically drives the printing scraper blade through sharp module drive printing drive module and prints the product, realizes automatic printing, and degree of automation is high.

Drawings

Fig. 1 is an explosion structure schematic diagram of the treadmill printer of the present invention;

FIG. 2 is a schematic view of the three-dimensional structure of the removing frame of the treadmill printer of the present invention;

FIG. 3 is a schematic perspective view of the treadmill printer of the present invention with another view angle of the frame removed;

fig. 4 is a schematic perspective view of the driving assembly of the treadmill of the present invention;

fig. 5 is a schematic view of a three-dimensional structure of the drying assembly of the present invention;

fig. 6 is a schematic perspective view of the first lifting assembly of the present invention;

fig. 7 is a schematic perspective view of the first lifting assembly of the present invention from another viewing angle;

fig. 8 is a schematic perspective view of a second lifting assembly according to the present invention;

fig. 9 is a schematic perspective view of the second lifting assembly of the present invention from another viewing angle;

fig. 10 is a schematic perspective view of the printing assembly of the present invention;

fig. 11 is a schematic perspective view of the positioning assembly of the present invention.

Description of reference numerals: the rack 100, the workbench 200, the running table track 300, the track groove 310, the transmission assembly 400, the base 410, the universal wheel 420, the transmission wheel set 430, the running table driving assembly 440, the buffer movable seat 441, the running table driving seat 442, the running table driving motor 443, the driving wheel 444, the rotating shaft 445, the drying assembly 450, the drying box 451, the drying lamp 452, the heat dissipation fan 453, the first lifting assembly 500, the first support 510, the first adjusting handle 511, the first adjusting groove 512, the first lifting module 520, the first lifting motor 521, the first screw 522, the first lifting plate 523, the first lifting rail 524, the first adjusting assembly 530, the first adjusting rail 531, the first adjusting seat 532, the first movable rail 533, the first supporting plate 540, the first connecting plate 541, the first buffer spring 542, the limiting block 543, the limiting wheel 544, the pressure sensor 550, the second lifting assembly 600, the second support 610, the second

adjusting handle

611, 531, the first movable rail 533, the first supporting plate 540, the first connecting plate 541, the first buffer spring 542, the limiting block 543, the limiting wheel 544, the pressure sensor 611, the second supporting plate 600, the second supporting assembly 600, the second adjusting handle 610, the second adjusting handle, The second adjusting groove 612, the second lifting module 620, the second lifting motor 621, the second screw 622, the second lifting plate 623, the second lifting rail 624, the second adjusting assembly 630, the second adjusting rail 631, the second adjusting seat 632, the second movable rail 633, the second supporting plate 640, the second connecting plate 641, the second buffer spring 642, the pressing and positioning module 650, the pressing and fixing plate 651, the pressing and moving plate 652, the pressing wheel 653, the pressing spring 654, the printing assembly 700, the linear module 710, the printing driving module 720, the printing squeegee 730, the positioning assembly 800, the positioning motor 810, the positioning screw 820, the positioning movable block 830, the contact sensing block 840, and the contact sensor 850.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1 to 11, a treadmill printer includes a frame 100, a table 200 disposed on a surface of the frame 100, a treadmill rail 300 disposed around the table 200, a driving assembly 400 driven on the treadmill rail 300, a first lifting assembly 500 mounted on the driving assembly 400, a second lifting assembly 600 mounted on the driving assembly 400 and opposite to the first lifting assembly 500, a printing assembly 700 mounted on the driving assembly 400, and a positioning assembly 800 mounted on the first lifting assembly 500.

Referring to fig. 2 to 3, the track groove 310 is formed on the track 300, the transmission assembly 400 includes a base 410, a universal wheel 420 installed on the base 410, a transmission wheel set 430 installed on the base 410 and transmitting to the track groove 310, and a track driving assembly 440 installed on one side of the base 410, the universal wheel 420 is used for transmission of the track on the surface of the workbench 200, and the transmission wheel set 430 is used for transmission on the track groove 310, so that the transmission stability is good, and the precision is high.

Referring to fig. 4, the running table driving assembly 440 includes a buffer movable seat 441 mounted on the base 410, a running table driving seat 442 mounted on the buffer movable seat 441, a running table driving motor 443 mounted on the running table driving seat 442, and a driving wheel 444 drivingly connected to the running table driving motor 443; the buffer movable seat 441 is connected with the running platform driving seat 442 through a rotating shaft 445, the buffer movable seat 441 is matched with the running platform driving seat 442 to move, the rotating shaft 445 can have a guiding effect when the running platform turns, and meanwhile, the buffer movable seat is connected with the power for running the platform under the action of a driving wheel 444 through a running platform driving motor 443, so that the buffer movable seat is good in driving stability and reliable in structure.

Referring to fig. 5, a drying assembly 450 is installed on one side of the printing assembly 700 of the base 410, the drying assembly 450 includes a drying box 451, a drying lamp 452 installed on the drying box 451, and a drying heat dissipation fan 453 installed on the drying box 451, and the printed ink can be dried by the drying assembly 450, so that the production efficiency can be effectively improved.

Referring to fig. 6 to 9, the first lifting assembly 500 includes a first bracket 510 mounted on the base 410, a first lifting module 520 mounted on the first bracket 510, a first adjusting assembly 530 mounted on the first bracket 510 and located on the first lifting module 520, and a first supporting plate 540 mounted on the first lifting module 520 and connected to the first adjusting assembly 530; the second lifting assembly 600 comprises a second bracket 610, a second lifting module 620 mounted on the second bracket 610, a second adjusting assembly 630 mounted on the second bracket 610 and located on the second lifting module 620, and a second supporting plate 640 mounted on the second lifting module 620 and connected with the second adjusting assembly 630, wherein the first lifting module 520 is provided with a pressure sensor 550; the two groups of supporting assemblies are similar in structure, the lifting module drives the supporting plate to lift so as to drive and support the silk screen, and the adjusting assembly is arranged to be suitable for supporting and using silk screens of different sizes, so that the application range is wide, and the structure is practical and reliable; in addition, set up pressure sensor 550 on first lift module 520, can respond to whether hold up there is the silk screen to realize intelligent control printing.

The first lifting module 520 comprises a first lifting motor 521 mounted on the first support 510, a first screw 522 in driving connection with the first lifting motor 521, a first lifting plate 523 connected to the first screw 522, and a first lifting rail 524 mounted between the first lifting plate 523 and the first support 510, wherein the first supporting plate 540 is mounted on the first lifting plate 523; in a further improvement, the second lifting module 620 comprises a second lifting motor 621 mounted on the second support 610, a second screw 622 drivingly connected to the second lifting motor 621, a second lifting plate 623 connected to the second screw 622, and a second lifting rail 624 mounted between the second lifting plate 623 and the second support 610, wherein the second supporting plate 640 is mounted on the second lifting plate 623; the lifting motor drives the lifting screw to drive the lifting plate to lift and transmit along the lifting guide rail, so that the transmission stability is good, and the silk screen is conveniently supported.

The pressure sensor 550 is installed between the first lifting rail 524 and the first lifting plate 523; the silk screen can be conveniently sensed after being supported, and the sensing effect is good.

The first adjusting assembly 530 comprises a first adjusting guide rail 531 mounted on the first bracket 510, a first adjusting seat 532 driven by the first adjusting guide rail 531, and a first movable guide rail 533 mounted on the first adjusting seat 532, the first supporting plate 540 is mounted on the first movable guide rail 533, the first bracket 510 is mounted with a first adjusting handle 511, the first bracket 510 is provided with a first adjusting slot 512 corresponding to the first adjusting handle 511, and the first adjusting handle 511 passes through the first adjusting slot 512 and is connected with the first adjusting seat 532; the second adjusting assembly 630 includes a second adjusting guide 631 mounted on the second support 610, a second adjusting seat 632 driven by the second adjusting guide 631, and a second movable guide 633 mounted on the second adjusting seat 632, the second support plate 640 is mounted on the second movable guide 633, the second support 610 is mounted with a second adjusting handle 611, the second support 610 is provided with a second adjusting groove 612 corresponding to the second adjusting handle 611, and the second adjusting handle 611 passes through the second adjusting groove 612 and is connected with the second adjusting seat 632; the adjusting guide rail is used for adjusting the longitudinal adjustment of the base, the adjusting guide rail is used for silk screens of different sizes, the adjusting handle is matched with the adjusting groove to adjust, lock and fix the position of the adjusting base, the adjusting is convenient, and the application range is wide.

The first supporting plate 540 comprises a first connecting plate 541 connected with the first lifting plate 523 and first buffer springs 542 arranged between the first lifting plate 523 and the first supporting plate 540, at least two groups of the first supporting plate 540 are arranged, at least one group of the first supporting plate 540 is provided with a limit block 543, and the limit block 543 is provided with limit wheels 544; the second lifting plate 623 is provided with a pressing and positioning module 650, the pressing and positioning module 650 comprises a pressing and fixing plate 651, a pressing and moving plate 652 hinged to the pressing and fixing plate 651, and a pressing wheel 653 mounted on the pressing and moving plate 652, and a pressing spring 654 is arranged between the pressing and moving plate 652 and the second bracket 610 for connection; the second supporting plate 640 comprises a second connecting plate 641 connected to the second lifting plate 623 and a second buffer spring 642 arranged between the second lifting plate 623 and the second supporting plate 640, and at least two groups of second supporting plates 640 are arranged; through having set up two sets of layer boards and set up buffer spring and connecting plate and be used for the connection and the fixed of structure, fixed effectual, stable in structure is reliable. The end face of the silk screen is positioned through the limiting block 543, accurate positioning is achieved under the cooperation of the limiting wheel 544, and the positioning effect is good. Through compressing tightly under the positioning module 650 effect, can compress tightly the silk screen the location, positioning accuracy further promotes, and the location is effectual.

Referring to fig. 10, the printing assembly 700 includes two sets of linear modules 710 disposed in parallel on the transmission assembly 400, a printing driving module 720 disposed between the two linear modules 710, and a printing squeegee 730 connected to a driving end of the printing driving module 720, wherein the printing squeegee 730 faces the worktable 200, and specifically, the linear modules 710 drive the printing driving module 720 to drive the printing squeegee 730 to print a product, so as to achieve automatic printing, and the degree of automation is high.

Referring to fig. 11, the positioning assembly 800 includes a positioning motor 810, a positioning screw 820 connected to a driving end of the positioning motor 810, a positioning movable block 830 connected to the positioning screw 820, and a contact sensing block 840 installed on the positioning movable block 830, and a contact sensor 850 is installed on one side of the first bracket 510 corresponding to the contact sensing block 840; under the cooperation through contact inductor 850 and contact response piece 840, can carry out the contact response to the product, specifically drive location movable block 830 through positioning screw 820 and drive contact response piece 840 and respond to the product height to make things convenient for layer board subassembly lift adjustment, so that follow-up printing.

The utility model discloses a run a structure, accessible transmission structure follows and runs a track 300 transmission, holds up the silk screen location of printing usefulness through two sets of layer board subassembly cooperation locating component 800 in the transmission process, and the product on the workstation 200 is printed through printing assembly 700 to the back, realizes the transmission printing, and degree of automation is high, uses manpower sparingly. Specifically, the device comprises a frame 100, a workbench 200 arranged on the surface of the frame 100, a running track 300 arranged around the workbench 200, a transmission assembly 400 transmitted to the running track 300, a first supporting plate 540 assembly 500 arranged on the transmission assembly 400, a second supporting assembly 600 arranged on the transmission assembly 400 and opposite to the first supporting plate 540 assembly 500, a printing assembly 700 arranged on the transmission assembly 400, and a positioning assembly 800 arranged on the first supporting plate 540 assembly 500; two sets of layer board subassembly adopts relative setting, can be steady hold up the silk screen to print the product, print effectually, still have locating component 800 and detect the location to the product, conveniently print, degree of automation is high.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A treadmill printing machine which characterized in that: the automatic printing machine comprises a rack, a workbench arranged on the surface of the rack, a running table track arranged around the workbench, a transmission assembly transmitted to the running table track, a first supporting assembly arranged on the transmission assembly, a second supporting assembly arranged on the transmission assembly and opposite to the first supporting assembly, a printing assembly erected on the transmission assembly, and a positioning assembly arranged on the first supporting assembly;

the printing component comprises two groups of linear modules arranged in parallel on the transmission component, a printing driving module erected between the two linear modules and a printing scraper connected to the driving end of the printing driving module, and the printing scraper faces towards the workbench.

2. The treadmill printer of claim 1, wherein: the running table track is provided with a track groove, and the transmission assembly comprises a base, universal wheels arranged on the base, a transmission wheel set arranged on the base and used for transmitting to the track groove, and a running table driving assembly arranged on one side of the base.

3. The treadmill printer of claim 2, wherein: the running platform driving assembly comprises a buffering movable seat arranged on the base, a running platform driving seat arranged on the buffering movable seat, a running platform driving motor arranged on the running platform driving seat and a driving wheel in driving connection with the running platform driving motor; and a rotating shaft is arranged between the buffer movable seat and the running platform driving seat and is connected with the running platform driving seat.

4. The treadmill printer of claim 3, wherein: the base is located printing module one side and installs the stoving subassembly, the stoving subassembly includes the stoving case, installs in the stoving lamp of stoving case, and installs in the stoving radiator fan of stoving case.

5. The treadmill printer of claim 4, wherein: the first lifting assembly comprises a first support arranged on the base, a first lifting module arranged on the first support, a first adjusting assembly arranged on the first support and positioned on the first lifting module, and a first supporting plate arranged on the first lifting module and connected with the first adjusting assembly; the second lifting assembly comprises a second support, a second lifting module arranged on the second support, a second adjusting assembly arranged on the second support and positioned on the second lifting module, and a second supporting plate arranged on the second lifting module and connected with the second adjusting assembly, and the first lifting module is provided with a pressure sensor.

6. The treadmill printer of claim 5, wherein: the first lifting module comprises a first lifting motor arranged on the first support, a first screw rod in driving connection with the first lifting motor, a first lifting plate connected to the first screw rod, and a first lifting guide rail arranged between the first lifting plate and the first support, and the first supporting plate is arranged on the first lifting plate;

the pressure sensor is arranged between the first lifting guide rail and the first lifting plate;

first adjusting part is including installing in the first regulation guide rail of first support, the transmission in the first regulation seat of first regulation guide rail and installing in the first movable guide of first regulation seat, first layer board is installed in first movable guide, first regulation handle is installed to first support, first support corresponds first regulation handle and has seted up first adjustment tank, first regulation handle passes first adjustment tank and is connected with first regulation seat.

7. The treadmill printer of claim 6, wherein: the first supporting plate comprises a first connecting plate connected with the first lifting plate and a first buffer spring arranged between the first lifting plate and the first supporting plate, the first supporting plate is at least provided with two groups, a limiting block is installed on at least one group of first supporting plate, and a limiting wheel is installed on the limiting block.

8. The treadmill printer of claim 7, wherein: the second lifting module comprises a second lifting motor arranged on the second support, a second screw rod in driving connection with the second lifting motor, a second lifting plate connected to the second screw rod, and a second lifting guide rail arranged between the second lifting plate and the second support, and the second supporting plate is arranged on the second lifting plate;

the second lifting plate is provided with a pressing and positioning module, the pressing and positioning module comprises a pressing fixed plate, a pressing movable plate hinged to the pressing fixed plate and a pressing wheel mounted on the pressing movable plate, and a pressing spring is arranged between the pressing movable plate and the second support and connected with the second support.

9. The treadmill printer of claim 8, wherein: the second adjusting assembly comprises a second adjusting guide rail arranged on a second support, a second adjusting seat driven by the second adjusting guide rail and a second movable guide rail arranged on the second adjusting seat, the second supporting plate is arranged on the second movable guide rail, the second support is provided with a second adjusting handle, the second support is provided with a second adjusting groove corresponding to the second adjusting handle, and the second adjusting handle penetrates through the second adjusting groove and is connected with the second adjusting seat;

the second supporting plate comprises a second connecting plate connected with the second lifting plate and second buffer springs arranged between the second lifting plate and the second supporting plate, and the second supporting plate is at least provided with two groups.

10. The treadmill printer of claim 9, wherein: the positioning assembly comprises a positioning motor, a positioning screw rod connected to the driving end of the positioning motor, a positioning movable block connected to the positioning screw rod, and a contact induction block installed on the positioning movable block, and a contact inductor is installed on one side of the first support corresponding to the contact induction block.