Automatic feeding and discharging device and steel mesh printing equipment

Abstract

The utility model belongs to the technical field of solder paste printing machines, and particularly relates to an automatic feeding and discharging device and steel mesh printing equipment. The automatic feeding and discharging device comprises a base, a feeding mechanism, a clamping mechanism and a supporting mechanism provided with a positioning groove; the feeding mechanism comprises a lifting driving assembly and a feeding table mounted on the lifting driving assembly, a plurality of mounting grooves distributed at intervals are formed in the feeding table, and the mounting grooves are used for mounting the supporting pieces; the clamping mechanism comprises a clamping driving assembly and a clamping assembly installed on the clamping driving assembly. The clamping driving assembly is used for driving the clamping assembly to move so that the clamping assembly can transfer the supporting piece between the mounting groove and the positioning groove. According to the utility model, the supporting member on the clamping assembly can be placed in the positioning groove of the supporting mechanism, the supporting mechanism can support the circuit board through the supporting member, and the circuit board is not in direct contact with the supporting mechanism, thereby facilitating the separation between the circuit board and the supporting mechanism, and ensuring the paste brushing quality of the circuit board.

Description

Technical Field

[0001] This utility model belongs to the technical field of solder paste printing machines, and in particular relates to an automatic loading and unloading device and a stencil printing equipment. Background Technology

[0002] Circuit boards are core components in electronic products. As electronic products become smaller and more precise, circuit board production is usually accomplished using surface mount technology (SMT). The first step in circuit board production is printing solder paste onto the circuit board, which is usually done automatically using a solder paste printer.

[0003] The solder paste printing machine includes a stencil conveying mechanism, a circuit board conveying mechanism, and a squeegee. The circuit board conveying mechanism can transport the circuit board to the solder paste application station, and the stencil conveying mechanism can transport the stencil to the solder paste application station. The stencil is located above the circuit board, and the squeegee can scrape the solder paste on the stencil onto the circuit board, thereby completing the solder paste printing work on the circuit board.

[0004] In the prior art, the solder paste is printed directly on the circuit board conveying mechanism or worktable. However, the circuit board is easy to stick to the circuit board conveying mechanism or worktable, which makes it inconvenient for the circuit board to be unloaded on the solder paste printer, reduces the unloading power of the solder paste printer, and reduces the solder paste quality of the circuit board. Summary of the Invention

[0005] This utility model provides an automatic loading and unloading device and a stencil printing equipment to solve the technical problem in the prior art that circuit boards are easily stuck to the circuit board conveying mechanism or workbench.

[0006] An embodiment of this utility model provides an automatic loading and unloading device, including a base, a feeding mechanism, a clamping mechanism, and a support mechanism with a positioning groove;

[0007] The feeding mechanism includes a lifting drive assembly mounted on the base and a feeding platform mounted on the lifting drive assembly. The feeding platform is provided with a plurality of spaced mounting slots for mounting support components.

[0008] The clamping mechanism includes a clamping drive assembly mounted on the base and a clamping assembly mounted on the clamping drive assembly; the clamping drive assembly is used to drive the clamping assembly to move, so that the clamping assembly transfers the support member between the mounting slot and the positioning slot.

[0009] Optionally, the clamping drive assembly includes a first X-axis drive member and a first Y-axis drive member, wherein the first X-axis drive member is mounted on the base and the first Y-axis drive member is mounted on the output end of the first X-axis drive member;

[0010] The clamping assembly includes a first support plate, a clamping member, and an identification member and a first Z-axis drive member, both mounted on the first support plate. The first support plate is mounted on the output end of the first Y-axis drive member. The clamping member is mounted on the output end of the first Z-axis drive member and is used to clamp the support member.

[0011] Optionally, the automatic loading and unloading device further includes a conveying mechanism, wherein the feeding mechanism includes two conveying components spaced apart on the base, and the conveying components are used to convey circuit boards;

[0012] The support mechanism includes a lifting drive mounted on the base and a support platform mounted on the output end of the lifting drive. The positioning groove is disposed on the support platform. The lifting drive is used to drive the support platform to rise and fall, so that the support platform is carried away from the circuit board on the conveying assembly by the support.

[0013] Optionally, the conveying assembly includes a side seat, a motor, a conveyor belt, and a plurality of pulleys rotatably mounted on the side seat. The motor is mounted on the side seat and connected to one of the pulleys. The conveyor belt is wound around the pulley and used to convey the circuit board. The side seat is mounted on the base.

[0014] Optionally, the lifting drive assembly includes two scissor lift assemblies and a base plate mounted on the base; the two scissor lift assemblies are spaced apart between the base plate and the feeding platform;

[0015] The scissor lift assembly includes a first support arm, a second support arm, a first roller mounted on the first support arm, and a second roller mounted on the second support arm; the middle portion of the first support arm is rotatably connected to the middle portion of the second support arm; the first roller abuts against the feeding platform, and the end of the first support arm away from the first roller is rotatably mounted on the base plate; the second roller abuts against the base plate, and the end of the second support arm away from the second roller is rotatably mounted on the feeding platform.

[0016] Optionally, the lifting drive assembly further includes a first connecting arm, a second connecting arm, and a telescopic drive component, wherein the first connecting arm is connected between two first support arms, and the second connecting arm is connected between two second support arms;

[0017] The fixed end of the telescopic drive component is rotatably mounted on the first connecting arm, and the output end of the telescopic drive component is rotatably connected to the second connecting arm.

[0018] Optionally, the base plate is provided with a first groove, and the lifting drive assembly further includes two first guide rails installed in the first groove; the second roller is rotatably installed on the first guide rail, and the side of the second roller abuts against the inner sidewall of the first groove;

[0019] The feeding platform is provided with a second groove, and the automatic feeding mechanism also includes two second guide rails installed in the second groove; the first roller is rotatably installed on the second guide rail, and the side of the first roller abuts against the inner sidewall of the second groove.

[0020] Another embodiment of this utility model provides a stencil printing device, including the above-mentioned automatic loading and unloading device.

[0021] In this invention, the feeding mechanism includes a lifting drive assembly mounted on the base and a feeding platform mounted on the lifting drive assembly. The feeding platform has multiple spaced mounting slots for mounting support components. The clamping mechanism includes a clamping drive assembly mounted on the base and a clamping component mounted on the clamping drive assembly. The clamping drive assembly drives the clamping component to move above the feeding platform, whereby the clamping component clamps the support component on the feeding platform. The clamping drive assembly then drives the clamping component to move above the support mechanism, whereby the clamping component can place the support component on it into the positioning slot of the support mechanism. The support mechanism can support the circuit board through the support component, preventing direct contact between the circuit board and the support mechanism. This facilitates separation between the circuit board and the support mechanism and prevents solder paste from adhering to the support mechanism during solder paste application, ensuring the quality of solder paste application on the circuit board.

[0022] In addition, the clamping mechanism can transfer the support member on the support mechanism to the feeding table, so that the clamping mechanism can transfer the support member between the support mechanism and the feeding table. The automatic loading and unloading device can complete the automatic loading and unloading function of the support member, thus improving the automation level of the automatic loading and unloading device. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an automatic loading and unloading device provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the support mechanism and conveying mechanism provided in one embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the clamping mechanism of an automatic loading and unloading device provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the clamping assembly of an automatic loading and unloading device according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the conveying component of an automatic loading and unloading device according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the feeding mechanism of an automatic loading and unloading device according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the lifting drive assembly of an automatic loading and unloading device according to an embodiment of the present invention.

[0031] The reference numerals in the accompanying drawings are as follows:

[0032] 1. Base; 2. Feeding mechanism; 21. Lifting drive assembly; 211. Scissor lift assembly; 2111. First support arm; 2112. Second support arm; 2113. First roller; 2114. Second roller; 212. Base plate; 2121. First groove; 213. First connecting arm; 214. Second connecting arm; 215. Telescopic drive component; 216. First guide rail; 22. Feeding platform; 221. Mounting slot; 3. Clamping mechanism; 31 311. Clamping drive assembly; 312. First X-axis drive component; 313. First Y-axis drive component; 32. Clamping assembly; 321. First support plate; 322. Clamping component; 323. Identifier; 324. First Z-axis drive component; 4. Support mechanism; 41. Lifting drive component; 42. Support platform; 421. Positioning groove; 6. Conveying mechanism; 61. Conveying assembly; 611. Side seat; 612. Conveyor belt; 613. Pulley; 10. Support component. Detailed Implementation

[0033] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] like Figure 1 , Figure 2 as well as Figure 6 As shown, an embodiment of the present invention provides an automatic loading and unloading device, including a base 1, a feeding mechanism 2, a clamping mechanism 3, and a support mechanism 4 with positioning grooves 421. It can be understood that the top surface of the support mechanism 4 is provided with a plurality of positioning grooves 421, and a support member 10 can be installed in each positioning groove 421. The support member 10 includes, but is not limited to, positioning pins, PIN pins, etc.

[0037] The feeding mechanism 2 includes a lifting drive assembly 21 mounted on the base 1 and a feeding platform 22 mounted on the lifting drive assembly 21. The feeding platform 22 is provided with a plurality of spaced mounting slots 221 for mounting the support member 10. It can be understood that the lifting drive assembly 21 includes, but is not limited to, a scissor lift assembly, a lead screw and nut assembly, and a pneumatic cylinder.

[0038] The clamping mechanism 3 includes a clamping drive assembly 31 mounted on the base 1 and a clamping assembly 32 mounted on the clamping drive assembly 31. The clamping drive assembly 31 drives the clamping assembly 32 to move, thereby transferring the support member 10 between the mounting groove 221 and the positioning groove 421. It can be understood that the clamping drive assembly 31 can drive the clamping assembly 32 to move along the X, Y, and Z directions. The clamping assembly 32 includes, but is not limited to, clamping blocks, suction components, etc.

[0039] In this utility model, the feeding mechanism 2 includes a lifting drive assembly 21 mounted on the base 1 and a feeding platform 22 mounted on the lifting drive assembly 21. The feeding platform 22 is provided with a plurality of spaced mounting slots 221 for mounting the support member 10. The clamping mechanism 3 includes a clamping drive assembly 31 mounted on the base 1 and a clamping assembly 32 mounted on the clamping drive assembly 31. The clamping drive assembly 31 drives the clamping assembly 32 to move above the feeding table 22. After the clamping assembly 32 clamps the support member 10 on the feeding table 22, the clamping drive assembly 31 drives the clamping assembly 32 to move above the support mechanism 4. The clamping assembly 32 can place the support member 10 on it in the positioning groove 421 of the support mechanism 4. The support mechanism 4 can support the circuit board through the support member 10. The circuit board will not directly contact the support mechanism 4, which facilitates the separation between the circuit board and the support mechanism 4 and avoids the solder paste sticking to the support mechanism 4 when the circuit board is brushed with solder paste, thus ensuring the quality of the solder paste application on the circuit board.

[0040] In addition, the clamping mechanism 3 can transfer the support member 10 on the support mechanism 4 to the feeding table 22, so that the clamping mechanism 3 can transfer the support member 10 between the support mechanism 4 and the feeding table 22. The automatic loading and unloading device can complete the automatic loading and unloading function of the support member 10, which improves the automation level of the automatic loading and unloading device.

[0041] In one embodiment, such as Figures 2 to 4 As shown, the clamping drive assembly 31 includes a first X-axis drive member 311 and a first Y-axis drive member 312. The first X-axis drive member 311 is mounted on the base 1, and the first Y-axis drive member 312 is mounted on the output end of the first X-axis drive member 311. It can be understood that the first X-axis drive member 311 and the first Y-axis drive member 312 include, but are not limited to, lead screw assemblies, pneumatic cylinders, hydraulic cylinders, and belt assemblies. The first X-axis drive member 311 can drive the first Y-axis drive member 312 to move along the X-axis.

[0042] The clamping assembly 32 includes a first support plate 321, a clamping member 322, and an identification member 323 and a first Z-axis drive member 324, both mounted on the first support plate 321. The first support plate 321 is mounted on the output end of the first Y-axis drive member 312; the clamping member 322 is mounted on the output end of the first Z-axis drive member 324 and is used to clamp the support member 10. Understandably, the identification member 323 includes, but is not limited to, a camera, a barcode scanner, etc.; the first Z-axis drive member 324 includes, but is not limited to, a pneumatic cylinder, a hydraulic cylinder, and a linear motor, etc.; the first Y-axis drive member 312 can drive the first support plate 321 to move along the Y-axis, and the first Z-axis drive member 324 can drive the clamping member 322 to move along the Z-axis. Further, the clamping member 322 includes a clamping cylinder and two clamping arms respectively mounted on the two output ends of the clamping cylinder. The clamping cylinder drives the two clamping arms to open and close, so that the two clamping arms clamp or release the support member 10.

[0043] In this embodiment, the identification element 323 can be the position of the mounting groove 221 or the support element 10 on the feeding table 22, and can identify the position of the positioning groove 421 or the support element 10 on the support mechanism 4; the clamping element 322 accurately transfers the support element 10 between the feeding table 22 and the support mechanism 4 according to the position identified by the identification element 323.

[0044] In one embodiment, such as Figure 2 and Figure 5 As shown, the automatic loading and unloading device further includes a conveying mechanism 6, and the feeding mechanism 2 includes two conveying components 61 spaced apart on the base 1. The conveying components 61 are used to convey circuit boards. It can be understood that the conveying components 61 include, but are not limited to, belt conveyor components 61, etc., and the two conveying components 61 can support the circuit board from the left and right ends. The lifting mechanism and the feeding mechanism 2 are located below the conveying mechanism 6. Further, the conveying components 61 can move the circuit board along the Y direction.

[0045] The support mechanism 4 includes a lifting drive 41 mounted on the base 1 and a support platform 42 mounted on the output end of the lifting drive 41. A positioning groove 421 is disposed on the support platform 42. The lifting drive 41 drives the support platform 42 to rise and fall, so that the support platform 42 is carried away from the circuit board on the conveying assembly 61 via the support member 10. Understandably, the lifting drive 41 includes, but is not limited to, a pneumatic cylinder, a hydraulic cylinder, a lead screw and nut mechanism, etc., and the support platform 42 is mounted on top of the lifting drive 41.

[0046] Specifically, the clamping mechanism 3 moves the support member 10 on the feeding table 22 into the positioning slot 421 of the support table 42. The conveying assembly 61 conveys the circuit board above the support table 42. The lifting drive 41 drives the support table 42 to move upward, and the support table 42 pushes the circuit board away from the conveying assembly 61 through the support member 10. After the solder paste printer prints the solder paste from the stencil onto the circuit board, the lifting drive 41 drives the support table 42 to move downward, and the circuit board is moved onto the conveying assembly 61. The conveying assembly 61 then transfers the circuit board with the solder paste applied to the unloading station. The clamping mechanism 3 then transfers the support member 10 on the support table 42 back to the feeding table 22. In this embodiment, the automatic loading and unloading device has a high degree of automation and high processing efficiency.

[0047] Furthermore, during the process of the clamping mechanism 3 clamping the support member 10 on the feeding table 22 or placing the support member 10 on the feeding table 22, the lifting drive assembly 21 drives the feeding table 22 to rise above the support table 42, thereby facilitating the clamping assembly 32 to clamp the support member 10 on the feeding table 22 or place the support member 10 on the feeding table 22.

[0048] In one embodiment, such as Figure 5 As shown, the conveying assembly 61 includes a side seat 611, a motor, a conveyor belt 612, and a plurality of pulleys 613 rotatably mounted on the side seat 611. The motor is mounted on the side seat 611 and connected to one of the pulleys 613. The conveyor belt 612 is wound around the pulley 613 and is used to convey the circuit board. The side seat 611 is mounted on the base 1. It can be understood that the number of pulleys 613 can be two, three, four, etc., depending on actual needs.

[0049] Specifically, the motor drives the pulley 613 to rotate, the pulley 613 drives the conveyor belt 612 to move, and the conveyor belt 612 can transport the circuit board. In this embodiment, the conveying assembly 61 has a simple structure, low manufacturing cost, and small space occupation.

[0050] In one embodiment, such as Figure 6 and Figure 7 As shown, the lifting drive assembly 21 includes two scissor lift assemblies 211 and a base plate 212 mounted on the base 1; the two scissor lift assemblies 211 are spaced apart between the base plate 212 and the feeding platform 22; it can be understood that the two scissor lift assemblies 211 are spaced apart in the front-rear direction between the base plate 212 and the support platform 42; the positioning groove 421 is provided on the top of the support platform 42.

[0051] The scissor lift assembly 211 includes a first support arm 2111, a second support arm 2112, a first roller 2113 mounted on the first support arm 2111, and a second roller 2114 mounted on the second support arm 2112. The middle portion of the first support arm 2111 is rotatably connected to the middle portion of the second support arm 2112. The first roller 2113 abuts against the feed table 22, and one end of the first support arm 2111 away from the first roller 2113 is rotatably mounted on the base plate 212. The second roller 2114 abuts against the base plate 212, and one end of the second support arm 2112 away from the second roller 2114 is rotatably mounted on the feed table 22. Understandably, the middle portions of the first support arm 2111 and the second support arm 2112 can be connected by a pivot.

[0052] Specifically, when the first support arm 2111 and the second support arm 2112 rotate relative to each other, the first roller 2113 rolls on the bottom surface of the support platform 42, and the second roller 2114 rolls on the top surface of the base plate 212, thereby reducing the friction between the scissor lift assembly 211 and the base plate 212 and the support platform 42, extending the service life of the lifting drive assembly 21, and ensuring the stability of the lifting of the support platform 42.

[0053] In one embodiment, such as Figure 6 and Figure 7 As shown, the lifting drive assembly 21 further includes a first connecting arm 213, a second connecting arm 214, and a telescopic drive component 215. The first connecting arm 213 is connected between two first support arms 2111, and the second connecting arm 214 is connected between two second support arms 2112. It can be understood that the first connecting arm 213 can limit the distance between the two first connecting arms 213, and the second connecting arm 214 can limit the distance between the two second connecting arms 214, thereby ensuring the stability of the lifting drive assembly 21 during operation.

[0054] The fixed end of the telescopic drive component 215 is rotatably mounted on the first connecting arm 213, and the output end of the telescopic drive component 215 is rotatably connected to the second connecting arm 214. It is understood that the telescopic drive component 215 includes, but is not limited to, pneumatic cylinders, hydraulic cylinders, and linear motors. Specifically, the telescopic drive component 215 drives the second connecting arm 214 to move, thereby changing the distance between the first connecting arm 213 and the second connecting arm 214, so that the scissor lift assembly 211 can drive the support platform 42 to rise and fall. In this embodiment, the design of the telescopic drive component 215 improves the automation level of the feeding mechanism 2.

[0055] In one embodiment, such as Figure 6 and Figure 7 As shown, the base plate 212 is provided with a first groove 2121, and the lifting drive assembly 21 further includes two first guide rails 216 installed in the first groove 2121; the second roller 2114 is rotatably mounted on the first guide rails 216, and the side of the second roller 2114 abuts against the inner sidewall of the first groove 2121; it can be understood that the first groove 2121 is provided on the top surface of the base plate 212, and the second roller 2114 is rotatably mounted on the side of the second support arm 2112. In this embodiment, the opposite two sides of the second roller 2114 abut against the inner sidewall of the second support arm 2112 and the first groove 2121 respectively, thereby restricting the second roller 2114 on the first guide rails 216 and ensuring the stability of the second roller 2114 moving along the first guide rails 216.

[0056] The feeding platform 22 is provided with a second groove (not shown in the figure), and the automatic feeding mechanism further includes two second guide rails (not shown in the figure) installed in the second groove; the first roller 2113 is rotatably mounted on the second guide rail, and the side of the first roller 2113 abuts against the inner sidewall of the second groove. Understandably, the second groove is located on the bottom surface of the support platform 42, and the first roller 2113 is rotatably mounted on the side of the first support arm 2111. In this embodiment, the opposite two sides of the first roller 2113 abut against the inner sidewalls of the first support arm 2111 and the second groove, respectively, thereby restricting the first roller 2113 to the second guide rail and ensuring the stability of the first roller 2113 moving along the second guide rail.

[0057] Another embodiment of this utility model provides a stencil printing device, including the above-mentioned automatic loading and unloading device.

[0058] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. An automatic loading and unloading device, characterized in that, It includes a base, a feeding mechanism, a clamping mechanism, and a support mechanism with positioning grooves; The feeding mechanism includes a lifting drive assembly mounted on the base and a feeding platform mounted on the lifting drive assembly. The feeding platform is provided with a plurality of spaced mounting slots for mounting support components. The clamping mechanism includes a clamping drive assembly mounted on the base and a clamping assembly mounted on the clamping drive assembly; the clamping drive assembly is used to drive the clamping assembly to move, so that the clamping assembly transfers the support member between the mounting slot and the positioning slot.

2. The automatic loading and unloading device according to claim 1, characterized in that, The clamping drive assembly includes a first X-axis drive member and a first Y-axis drive member. The first X-axis drive member is mounted on the base, and the first Y-axis drive member is mounted on the output end of the first X-axis drive member. The clamping assembly includes a first support plate, a clamping member, and an identification member and a first Z-axis drive member, both mounted on the first support plate. The first support plate is mounted on the output end of the first Y-axis drive member. The clamping member is mounted on the output end of the first Z-axis drive member and is used to clamp the support member.

3. The automatic loading and unloading device according to claim 1, characterized in that, The automatic loading and unloading device also includes a conveying mechanism, and the feeding mechanism includes two conveying components installed at intervals on the base, the conveying components being used to convey circuit boards; The support mechanism includes a lifting drive mounted on the base and a support platform mounted on the output end of the lifting drive. The positioning groove is disposed on the support platform. The lifting drive is used to drive the support platform to rise and fall, so that the support platform is carried away from the circuit board on the conveying assembly by the support.

4. The automatic loading and unloading device according to claim 3, characterized in that, The conveying assembly includes a side seat, a motor, a conveyor belt, and a plurality of pulleys rotatably mounted on the side seat. The motor is mounted on the side seat and connected to one of the pulleys. The conveyor belt is wound around the pulley and used to convey the circuit board. The side seat is mounted on the base.

5. The automatic loading and unloading device according to claim 1, characterized in that, The lifting drive assembly includes two scissor assemblies and a base plate mounted on the base; the two scissor assemblies are spaced apart between the base plate and the feeding platform. The scissor lift assembly includes a first support arm, a second support arm, a first roller mounted on the first support arm, and a second roller mounted on the second support arm; the middle portion of the first support arm is rotatably connected to the middle portion of the second support arm; the first roller abuts against the feeding platform, and the end of the first support arm away from the first roller is rotatably mounted on the base plate; the second roller abuts against the base plate, and the end of the second support arm away from the second roller is rotatably mounted on the feeding platform.

6. The automatic loading and unloading device according to claim 5, characterized in that, The lifting drive assembly further includes a first connecting arm, a second connecting arm, and a telescopic drive component. The first connecting arm is connected between two first support arms, and the second connecting arm is connected between two second support arms. The fixed end of the telescopic drive component is rotatably mounted on the first connecting arm, and the output end of the telescopic drive component is rotatably connected to the second connecting arm.

7. The automatic loading and unloading device according to claim 5, characterized in that, The base plate is provided with a first groove, and the lifting drive assembly further includes two first guide rails installed in the first groove; the second roller is rotatably installed on the first guide rail, and the side of the second roller abuts against the inner sidewall of the first groove; The feeding platform is provided with a second groove, and the automatic feeding mechanism also includes two second guide rails installed in the second groove; the first roller is rotatably installed on the second guide rail, and the side of the first roller abuts against the inner sidewall of the second groove.

8. A stencil printing device, characterized in that, Includes the automatic loading and unloading device as described in any one of claims 1 to 7.

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