Screen drawing machine for silk-screen printing plate

Abstract

A connecting rod is arranged on a feeding mechanism, a silk screen roll is connected to the connecting rod in a sleeved mode, a silk screen is pulled to be gradually unfolded, the silk screen enters a working area above a machine frame through a feeding port, and the left edge and the front edge and the rear edge of the silk screen are clamped through a first clamping mechanism. Then the right side edge of the silk screen is fixed through a second clamping mechanism, so that the four edges of the silk screen are clamped and fixed, a worm gear speed reducer is driven to operate through a driving motor, transmission gears at the two ends of a transmission rod are in meshing transmission with racks in guide rods, a sliding plate is driven to do linear motion along the guide rods, and therefore the silk screen is stretched; automatic clamping of the silk screen is achieved through the first clamping mechanism and the second clamping mechanism, the screen pulling efficiency is effectively improved, and the manual operation intensity is reduced; the product quality is improved. The device has the advantages of simple structure, convenience in operation and the like, and can effectively improve the working efficiency and reduce the labor intensity.

Description

Technical Field

[0001] This utility model relates to the field of screen printing machine technology, and in particular to a screen printing stencil screen printing machine. Background Technology

[0002] Screen printing is a type of stencil printing. In screen printing, ink is transferred to the substrate through the mesh openings of the image area by the pressure of a squeegee, forming an image identical to the original artwork. Screen printing equipment is simple, easy to operate, and the printing and plate-making processes are simple and inexpensive. It has strong applicability and a wide range of applications, commonly used in the production of printing screens for industries such as PCB, FPC, glass, printing, and TP. During the screen printing process, the screen needs to be clamped and fixed according to the printing requirements to ensure efficient screen printing.

[0003] Currently, in screen printing, the screen needs to be fixed to a frame before printing. This is achieved using a screen stretching machine or similar device to unfold the screen, followed by clamping devices to secure the edges. However, in practice, each edge of the screen requires multiple clamping devices. Typically, this is done manually by manually adjusting the fixing devices on the frame to secure each of the four edges. This process is time-consuming, labor-intensive, and inefficient, failing to meet the demands of mass production. Utility Model Content

[0004] Therefore, it is necessary to provide a screen printing stencil stretching machine.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A screen printing stencil stretching machine includes: a frame, a lifting platform, a first clamping mechanism, a second clamping mechanism, a telescopic mechanism, and a feeding mechanism; the lifting platform is disposed in the middle of the frame, and the height of the lifting platform is adjustable; multiple guide rods are provided on the outer side walls of the frame, and sliding plates are provided on the four sides of the upper end face of the frame, the sliding plates are slidably connected to the upper end face of the frame, and the end of the sliding plate away from the frame extends downward and is slidably connected to the guide rods; The telescopic mechanism is located on the side wall of the sliding plate away from the frame, and both ends of the telescopic mechanism are connected to guide rods. The telescopic mechanism controls the sliding plate to move closer to or away from the center of the frame. The first clamping mechanism is located on both sides along the length of the frame and above the sliding plate at the first end of the frame, and is used to clamp the wire mesh. The second clamping mechanism and the feeding mechanism are located on the sliding plate at the second end of the frame. The feeding mechanism is provided with a connecting rod for installing the wire mesh roll. The feeding mechanism is provided with a feeding port, and the wire mesh enters the upper end of the frame from the feeding port.

[0006] In one embodiment, the lifting platform includes a plurality of lifting cylinders symmetrically arranged on the inner sidewall of the frame and a lifting plate fixed to the upper end of the lifting cylinders, the bottom of the lifting plate being fixedly connected to the output end of the lifting cylinder.

[0007] In one embodiment, the inner sidewall of the frame is provided with a plurality of first slide rails, and the sidewall of the lifting plate is provided with a first slide groove corresponding to the first slide rail, the first slide groove being slidably connected to the first slide rail.

[0008] In one embodiment, the bottom of each sliding plate is provided with a second slide rail, and the upper surface of the frame is provided with a plurality of second slide grooves, the second slide grooves being slidably connected to the second slide rails and corresponding one-to-one in position.

[0009] In one embodiment, each outer side wall of the frame is provided with two guide rods, which are respectively located at both ends of the outer side wall of the frame; the guide rod is a groove with an open top, and the groove is provided with a rack inside.

[0010] In one embodiment, the telescopic mechanism includes a worm gear reducer fixed on the side wall of the sliding plate away from the center of the frame, a drive motor fixedly connected to the bottom of the worm gear reducer, a transmission rod disposed in the worm gear reducer, and transmission gears fixed at both ends of the transmission rod, wherein the transmission gears at both ends of the transmission rod mesh with racks at both ends of the side wall of the frame.

[0011] In one embodiment, the first clamping mechanism includes a plurality of first clamping cylinders, a connecting bar, a clamping lever, a first upper clamping bar, and a first lower clamping bar; the plurality of first clamping cylinders are arranged on the upper end face of the sliding plate; one end of the connecting bar is hinged to the output end of the first clamping cylinder, and the other end is fixedly connected to the first upper clamping bar; the clamping lever is rotatably connected to the middle of the connecting bar; and the first lower clamping bar is fixed on the sliding plate.

[0012] In one embodiment, the clamping surfaces of the first upper clamping bar and the first lower clamping bar are respectively provided with corresponding serrated patterns.

[0013] In one embodiment, the second clamping mechanism includes a gantry frame, a plurality of second clamping cylinders, a second upper clamping bar, and a second lower clamping bar. The gantry frame and the second lower clamping bar are both disposed on a sliding plate at the second end of the frame, and the second lower clamping bar is disposed parallel to the gantry frame. The second clamping cylinders are disposed at equal intervals on the gantry frame, and the output end of the second clamping cylinder passes through the upper end face of the gantry frame and is fixedly connected to the second upper clamping bar. The structure of the second upper clamping bar and the second lower clamping bar is the same as the structure of the first upper clamping bar and the first lower clamping bar.

[0014] In one embodiment, the feeding mechanism includes a feeding table disposed on the side of the second clamping mechanism away from the frame, and a connecting rod for mounting the wire mesh roll is provided at the upper end of the outer side wall of the feeding table; the feeding table is provided with a feed inlet in the middle for the wire mesh to enter the upper part of the frame.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a screen printing stencil stretching machine. By providing a connecting rod on the feeding mechanism, the screen roll is sleeved on the connecting rod. Pulling the screen gradually unfolds it, allowing it to enter the working area above the machine frame through the feeding port. A first clamping mechanism clamps the left and front / back edges of the screen, and a second clamping mechanism fixes the right edge of the screen, thus achieving four-sided clamping and fixing of the screen. The serrated patterns on the first upper and first lower clamping bars of the first clamping mechanism, and the serrated patterns on the second upper and second lower clamping bars of the second clamping mechanism... The serrated pattern on the lower clamping bar increases the friction with the wire mesh through mechanical engagement, preventing slippage during stretching and avoiding excessive damage to the wire mesh. This ensures the stability and reliability of the stretching process. A drive motor rotates the worm gear reducer, causing the transmission gears at both ends of the transmission rod to mesh with the rack inside the guide rod, driving the sliding plate to move linearly along the guide rod, thus stretching the wire mesh. This invention achieves automatic clamping of the wire mesh through the first and second clamping mechanisms, effectively improving stretching efficiency, reducing manual labor intensity, and improving product quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a screen printing stencil stretching machine according to one embodiment;

[0018] Figure 2 This is a cross-sectional structural diagram of a screen printing stencil stretching machine according to one embodiment;

[0019] Figure 3 for Figure 2 Enlarged diagram of section A in the middle;

[0020] Figure 4 This is a schematic diagram of the structure of the second clamping mechanism according to one embodiment.

[0021] In the attached diagram, 10 is a screen printing stencil stretching machine; 100 is a frame; 110 is a left sliding plate; 120 is a right sliding plate; 130 is a front sliding plate; 140 is a rear sliding plate; 150 is a guide rod; 151 is a rack; 200 is a lifting platform; 210 is a lifting cylinder; 220 is a lifting plate; 230 is a first slide rail; 300 is a first clamping mechanism; 310 is a first clamping cylinder; 320 is a connecting bar; and 330 is a clamp. Holding lever; 340, first upper clamping bar; 350, first lower clamping bar; 400, second clamping mechanism; 410, gantry frame; 420, second clamping cylinder; 430, second upper clamping bar; 440, second lower clamping bar; 500, telescopic mechanism; 510, worm gear reducer; 520, drive motor; 530, transmission rod; 600, feeding mechanism; 610, feeding table; 620, feeding port; 630, connecting rod. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments. The present invention is not limited to the specific embodiments described below.

[0023] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," "rear," "left," "right," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] In one embodiment, such as Figures 1 to 4As shown, a screen printing stencil stretching machine 10 includes: a frame 100, a lifting platform 200, a first clamping mechanism 300, a second clamping mechanism 400, a telescopic mechanism 500, and a feeding mechanism 600; the lifting platform 200 is disposed in the middle of the frame 100, and the height of the lifting platform 200 is adjustable; multiple guide rods 150 are provided on the outer side walls of the frame 100, and sliding plates are provided on the four sides of the upper end face of the frame 100, the sliding plates are slidably connected to the upper end face of the frame 100, and the end of the sliding plate away from the frame 100 extends downward and is slidably connected to the guide rods 150; the telescopic mechanism 500 is disposed in the... The sliding plate is located on the side wall away from the frame 100, and both ends of the telescopic mechanism 500 are connected to the guide rod 150 respectively. The telescopic mechanism 500 controls the sliding plate to move closer to or away from the center of the frame 100. The first clamping mechanism 300 is disposed on both sides along the length of the frame 100 and above the sliding plate at the first end of the frame 100, and is used to clamp the wire mesh. The second clamping mechanism 400 and the feeding mechanism 600 are disposed on the sliding plate at the second end of the frame 100. The feeding mechanism 600 is provided with a connecting rod 630 for installing the wire mesh roll. The feeding mechanism 600 is provided with a feeding port 620, and the wire mesh enters the upper end of the frame 100 from the feeding port 620.

[0025] In this embodiment, the upper surface of the frame 100 is a U-shaped frame structure. The lifting platform 200 is located in the middle of the frame 100 and is slidably connected to the inner side wall of the frame 100. Sliding plates are provided on all four sides of the upper surface of the frame 100. The sliding plates are slidably connected to the upper surface of the frame 100. The end of the sliding plate away from the frame 100 extends downward, forming an L-shaped structure. The lower end of the sliding plate is sleeved on a guide rod 150 on the same side, allowing the sliding plate to slide along the guide rod 150. A telescopic mechanism 500 is provided on the side of each sliding plate away from the frame 100. Connected to the rack 151 inside the guide rod 150, the sliding plate is driven to slide along the guide rod 150 through the telescopic mechanism 500, thereby adjusting the position of the sliding plate. Each sliding plate has the same structure. According to the different positions of the sliding plate in the frame 100, they are divided into left sliding plate 110, right sliding plate 120, front sliding plate 130 and rear sliding plate 140. The left sliding plate 110 is located at the first end of the frame 100, the right sliding plate 120 is located at the second end of the frame 100, and the front sliding plate 130 and the rear sliding plate 140 are located on both sides of the length direction of the frame 100, respectively. A first clamping mechanism 300 is provided above the left sliding plate 110, the front sliding plate 130, and the rear sliding plate 140 to clamp the edge of the wire mesh. A second clamping mechanism 400 and a feeding mechanism 600 are provided above the right sliding plate 120 in sequence. The second clamping mechanism 400 is located on the side of the feeding mechanism 600 near the center of the frame 100. The feeding mechanism 600 is provided with a connecting rod 630 and a feeding port 620. The connecting rod 630 is used to install the wire mesh roll. Pulling one end of the wire mesh causes the wire mesh roll to rotate, and the wire mesh unfolds and enters the working area at the upper end of the frame 100 from the feeding port 620. The four sides of the wire mesh are clamped by the first clamping mechanism 300 and the second clamping mechanism 400, and the position of the sliding plate is adjusted by the telescopic mechanism 500 to keep the wire mesh in a taut state.

[0026] like Figure 2 As shown, the lifting platform 200 includes a lifting plate 220 and a plurality of lifting cylinders 210 for controlling the up and down movement of the lifting plate 220. The plurality of lifting cylinders 210 are symmetrically arranged on two opposite inner side walls of the frame 100. The lifting cylinders 210 are fixed to the mounting plate on the inner side wall of the frame 100 by bolts. The upper end of the piston rod of the lifting cylinder 210 is fixedly connected to the lower end face of the lifting plate 220. The extension and retraction of the lifting cylinders 210 drives the lifting plate 220 to slide up and down along the inner side wall of the frame 100. The lifting plate 220 is used to place the wire mesh frame. The lifting action of the lifting platform 200 drives the wire mesh frame to contact or separate from the wire mesh.

[0027] Furthermore, a first sliding groove is provided on the side wall of the lifting platform 200 that is connected to the frame 100, and a first slide rail 230 that matches the first sliding groove is provided on the inner side wall of the frame 100. The first sliding groove and the first slide rail 230 are slidably connected, so that the lifting platform 200 remains stable during the up and down movement, avoids shaking or deviation, and improves the smoothness and accuracy of the operation of the lifting platform 200.

[0028] To improve the stability of the stretching process after clamping the wire mesh, a second slide rail is provided at the bottom of each sliding plate, and a second slide groove is provided on the upper surface of the frame 100. The second slide groove matches the second slide rail, and the second slide rail is slidably connected in the second slide groove, with each position corresponding to the other. This ensures that the sliding plate maintains good guiding cooperation with the frame 100 during movement, thereby improving the stability of the sliding plate during movement.

[0029] Furthermore, each of the four outer side walls of the frame 100 is provided with two guide rods 150 fixed at both ends of the side wall. The upper end face of the guide rod 150 is provided with a mounting groove, and a rack 151 is fixedly installed in the mounting groove. In order to prevent the mounting plate from falling off the upper end face of the frame 100, the length of the second slide rail is greater than the length of the guide rod 150, and a baffle is provided at the end of the guide rod 150 away from the frame 100, thereby preventing the sliding plate from falling off the guide rod 150 during the sliding process and improving the overall safety and stability of the equipment.

[0030] To drive the sliding plate to move closer to or away from the center of the frame 100, a telescopic mechanism 500 is provided on the side wall of the sliding plate away from the frame 100. The telescopic mechanism 500 includes a worm gear reducer 510, a drive motor 520, a transmission rod 530, and a transmission gear. The worm gear reducer 510 is fixed to the side wall of the sliding plate, and the drive motor 520 is fixed below the worm gear reducer 510, with the output shaft of the drive motor 520 connected to the input end of the worm gear reducer 510. The transmission rod 530 is located in the middle of the worm gear reducer 510. The two ends of the transmission rod 530 are fixedly connected to two transmission gears respectively. The length between the two ends of the transmission rod 530 is the same as the distance between the two guide rods 150 on the same side, so that the transmission gear can be placed in the mounting groove and mesh with the rack 151. The drive motor 520 drives the worm gear reducer 510 to rotate, thereby driving the transmission rod 530 to rotate, so that the transmission gear moves along the rack 151, realizing the reciprocating motion of the sliding plate on the guide rod 150. Since the bottom of the sliding plate is sleeved on the guide rod 150, the sliding plate can remain stable during the movement.

[0031] To ensure the wire mesh is securely clamped, a first clamping mechanism 300 is provided on the front sliding plate 130, the rear sliding plate 140, and the left sliding plate 110. Each first clamping mechanism 300 includes multiple first clamping cylinders 310, connecting bars 320, clamping levers 330, a first upper clamping bar 340, and a first lower clamping bar 350. The first clamping cylinders 310 are arranged at equal intervals above the sliding plates. The piston rod of each first clamping cylinder 310 is hinged to one end of the connecting bar 320, and the other end of the connecting bar 320 is fixedly connected to the first upper clamping bar 340. The clamping lever 330 is fixed to the sliding plate, and its upper end... The connecting bar 320 is rotatably connected to the middle part of the connecting bar 320. The number of clamping levers 330 is the same as the number of connecting bars 320, and their positions correspond one-to-one. The first lower clamping bar 350 is fixed on the upper end surface of the sliding plate. When the piston rod of the first clamping cylinder 310 extends upward, it drives one end of the connecting bar 320 to move upward, thereby controlling the middle part of the connecting bar 320 to rotate around the clamping lever 330, so that the other end of the connecting bar 320 presses down against the first upper clamping bar 340, thereby clamping the wire mesh between the first upper clamping bar 340 and the first lower clamping bar 350, realizing a stable clamping of the wire mesh, and ensuring that the wire mesh will not loosen or shift during subsequent work.

[0032] Furthermore, corresponding serrated patterns are provided on the clamping surfaces of the first upper clamping bar 340 and the first lower clamping bar 350, respectively. The two serrated patterns cooperate with each other to increase the friction during clamping and prevent the wire mesh from slipping during stretching; at the same time, it avoids excessive damage to the edge of the wire mesh.

[0033] Furthermore, a second clamping mechanism 400 is provided on the right sliding plate 120. The four edges of the wire mesh are fixed by the first clamping mechanism 300 and the second clamping mechanism 400 respectively, thereby achieving comprehensive clamping and fixing of the wire mesh. The second clamping mechanism 400 includes a gantry frame 410 fixed on the right sliding plate 120. The upper end of the gantry frame 410 is provided with a plurality of equally spaced second clamping cylinders 420. The second clamping cylinders 420 are fixedly connected to the upper end face of the gantry frame 410, and the output end of the second clamping cylinder 420 passes through the upper end face of the gantry frame 410 and extends downward, and is fixedly connected to the second upper clamping bar 430. A limiting post is also provided between each pair of second clamping cylinders 420, and the limiting post passes through the gantry frame 410. The limiting hole on the upper end face is fixedly connected to the second upper clamping bar 430; the second lower clamping bar 440 is fixed on the upper end face of the right sliding plate 120 and is arranged opposite to the second upper clamping bar 430. The structure of the second upper clamping bar 430 and the second lower clamping bar 440 is the same as that of the first upper clamping bar 340 and the first lower clamping bar 350. The second upper clamping bar 430 moves up and down by extending and retracting the piston rod of the second clamping cylinder 420, thereby realizing the clamping and release of the right edge of the wire mesh.

[0034] To facilitate wire mesh feeding, a feeding mechanism 600 is provided on the right sliding plate 120. The feeding mechanism 600 is located on the outer side of the second clamping mechanism 400 away from the frame 100. The feeding mechanism 600 includes a feeding table 610 with a horizontal feed inlet in the middle. A fixing frame is provided on the upper end of the side wall of the feeding table 610 away from the second clamping mechanism 400. A horizontally arranged connecting rod 630 is provided on the fixing frame. One end of the connecting rod 630 is hinged to one side of the fixing frame, and the other end of the fixing frame is provided with an L-shaped fixing groove. The other end of the connecting rod 630 is inserted into the L-shaped fixing groove, forming a detachable connection with the fixing frame. When it is necessary to feed wire mesh, one end of the connecting rod 630 is removed from the L-shaped fixing groove, and the connecting rod 630 is rotated around the other end to unfold outward. The wire mesh roll is placed on the connecting rod 630, and the connecting rod 630 is inserted back into the L-shaped fixing groove. One end of the wire mesh is pulled through the feed port and laid flat above the frame 100. The four sides of the wire mesh are clamped and fixed by the first clamping mechanism 300 and the second clamping mechanism 400 to complete the feeding process.

[0035] It is worth noting that the aforementioned lifting cylinder, first clamping cylinder, and second clamping cylinder are connected to an external air source via air pipes, and solenoid valves are installed on the air pipes to control the action of each cylinder.

[0036] The general workflow of this utility model is as follows: First, the wire mesh roll is placed on the connecting rod 630. The wire mesh is pulled to unfold it and lay it flat on the upper end of the frame 100 through the feed inlet. Then, the first clamping cylinder 310 and the second clamping cylinder 420 are activated in sequence. The first upper clamping bar 340 and the first lower clamping bar 350 of the three first clamping mechanisms 300 clamp the left edge and the front and rear edges of the wire mesh, respectively. The second upper clamping bar 430 and the second lower clamping bar 440 of the second clamping mechanism 400 clamp the right edge of the wire mesh, thereby achieving the clamping and fixing of the wire mesh on all four sides. Then, the drive motor 520 is started, and the drive motor 520 drives the worm gear reducer. The machine 510 operates, which in turn drives the transmission rod 530 to rotate. The transmission rod 530 drives the transmission gears at both ends to rotate synchronously, causing the transmission gears to move along the rack 151 inside the guide rod 150. This causes the sliding plate to slide away from the frame 100, thereby gradually tensioning the screen. When the tension reaches a preset value, the drive motor 520 stops operating, and the lifting cylinder 210 is activated to push the lifting plate 220 upward. A screen printing frame is located above the lifting plate 220. The lifting cylinder 210 pushes the lifting plate 220 to a predetermined height, so that the screen printing frame and the tensioned screen are tightly fitted together, completing the screen printing. This utility model has the advantages of simple structure, convenient operation, and reliable clamping, which can effectively improve work efficiency, reduce labor intensity, and improve the quality of screen printed products.

[0037] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A screen printing stencil stretching machine, characterized in that, include: The machine comprises a frame, a lifting platform, a first clamping mechanism, a second clamping mechanism, a telescopic mechanism, and a feeding mechanism. The lifting platform is located in the middle of the frame, and its height is adjustable. Multiple guide rods are provided on the outer walls of the frame. Sliding plates are provided on all four sides of the upper surface of the frame, slidably connected to the upper surface of the frame. The end of the sliding plate away from the frame extends downwards and is slidably connected to the guide rod. The telescopic mechanism is located on the side wall of the sliding plate away from the frame, and both ends of the telescopic mechanism are connected to the guide rods. The telescopic mechanism controls the sliding plate to move closer to or away from the center of the frame. The first clamping mechanism is located on both sides along the length of the frame and above the sliding plate at the first end of the frame, used to clamp the wire mesh. The second clamping mechanism and the feeding mechanism are located on the sliding plate at the second end of the frame. The feeding mechanism has a connecting rod for installing the wire mesh roll. The feeding mechanism has a feeding port through which the wire mesh enters the upper end of the frame.

2. The screen printing stencil stretching machine according to claim 1, characterized in that, The lifting platform includes multiple lifting cylinders symmetrically arranged on the inner side wall of the frame and a lifting plate fixed to the upper end of the lifting cylinders. The bottom of the lifting plate is fixedly connected to the output end of the lifting cylinder.

3. A screen printing stencil stretching machine according to claim 2, characterized in that, The inner sidewall of the frame is provided with a plurality of first slide rails, and the sidewall of the lifting plate is provided with a first slide groove corresponding to the first slide rails, and the first slide groove is slidably connected to the first slide rails.

4. The screen printing stencil stretching machine according to claim 1, characterized in that, The bottom of each sliding plate is provided with a second slide rail, and the upper surface of the frame is provided with a plurality of second slide grooves. The second slide grooves are slidably connected to the second slide rails, and their positions correspond one-to-one.

5. A screen printing stencil stretching machine according to claim 1, characterized in that, Two guide rods are provided on each outer side wall of the frame, respectively located at both ends of the outer side wall of the frame; the guide rod is a groove with an open top, and a rack is provided inside the groove.

6. A screen printing stencil stretching machine according to claim 5, characterized in that, The telescopic mechanism includes a worm gear reducer fixed on the side wall of the sliding plate away from the center of the frame, a drive motor fixedly connected to the bottom of the worm gear reducer, a transmission rod disposed in the worm gear reducer, and transmission gears fixed at both ends of the transmission rod. The transmission gears at both ends of the transmission rod mesh with racks at both ends of the side wall of the frame, respectively.

7. A screen printing stencil stretching machine according to claim 1, characterized in that, The first clamping mechanism includes a plurality of first clamping cylinders, a connecting bar, a clamping lever, a first upper clamping bar, and a first lower clamping bar; the plurality of first clamping cylinders are arranged on the upper end face of the sliding plate; one end of the connecting bar is hinged to the output end of the first clamping cylinder, and the other end is fixedly connected to the first upper clamping bar; the clamping lever is rotatably connected to the middle part of the connecting bar; the first lower clamping bar is fixed on the sliding plate.

8. A screen printing stencil stretching machine according to claim 7, characterized in that, The clamping surfaces of the first upper clamping bar and the first lower clamping bar are respectively provided with corresponding serrated patterns.

9. A screen printing stencil stretching machine according to claim 8, characterized in that, The second clamping mechanism includes a gantry frame, multiple second clamping cylinders, a second upper clamping bar, and a second lower clamping bar. The gantry frame and the second lower clamping bar are both mounted on a sliding plate at the second end of the frame, and the second lower clamping bar is arranged parallel to the gantry frame. The second clamping cylinders are evenly spaced on the gantry frame, and the output end of the second clamping cylinder passes through the upper end face of the gantry frame and is fixedly connected to the second upper clamping bar. The structure of the second upper clamping bar and the second lower clamping bar is the same as that of the first upper clamping bar and the first lower clamping bar.

10. A screen printing stencil stretching machine according to claim 1, characterized in that, The feeding mechanism includes a feeding platform located on the side of the second clamping mechanism away from the frame. The upper end of the outer wall of the feeding platform is provided with a connecting rod for installing the wire mesh roll. The middle part of the feeding platform is provided with a feed inlet for the wire mesh to enter the upper part of the frame.

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