An adaptive screen silk-screen printing screen stretching machine

Abstract

The application relates to a self-adaptive screen printing screen frame silk screen printing screen stretching machine, belonging to the technical field of screen printing. A lifting mechanism is arranged in a supporting seat, and the lifting mechanism is connected with a supporting plate. Installing rods are equidistantly arranged on four side edges above a bottom plate, and the installing rods are connected with the bottom plate through adjusting mechanisms. A resisting block is correspondingly arranged on the upper side of each of the three installing rods, and a connecting frame is fixed to the lower side of each of the resisting blocks and arranged in an L shape, and the horizontal rod of the connecting frame is movably arranged in the installing rod. Connecting rods are arranged on the upper sides of the installing rods on the other side, the grooves on the two connecting rods are matched and arranged in abutment, the connecting rods are connected with the adjacent resisting blocks, and driving mechanisms are arranged in the installing rods on the three sides respectively, and the driving mechanisms are connected with the horizontal rods of the connecting frames. Through automatic adjusting of the screen frame height and multi-directional synchronous screen stretching technology, fast and accurate tension control is realized, the screen tension is uniform and stable, and the silk printing quality and the production efficiency are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of screen printing technology, and more specifically to an adaptive screen frame screen printing plate stretching machine. Background Technology

[0002] In the field of screen printing technology, the quality of screen printing stencil production directly affects printing accuracy and yield, with the stencil stretching process being particularly critical. Traditional stencil stretching machines generally employ a fixed structure, which suffers from poor frame adaptability and insufficient tension adjustment precision. Especially when dealing with frames of different sizes or special shapes, frequent clamp changes are necessary, and it is difficult to ensure uniform tension. Existing equipment often relies on manual experience to adjust clamping force and levelness, which can easily lead to localized stress concentration or relaxation of the stencil, affecting the clarity of the printed pattern and repeatability. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a reasonably designed and easy-to-use adaptive screen printing stencil stretching machine. Through automatic adjustment of the stencil height and multi-directional synchronous stretching technology, it achieves rapid and precise tension control, ensuring uniform and stable screen tension, and significantly improving screen printing quality and production efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: it comprises a base plate, a support plate, and a support base, wherein the support base is disposed on the upper surface of the base plate, and the support plate is disposed on the upper side of the support base; it further comprises: A lifting mechanism is provided inside the support base and is connected to the support plate; The mounting rods are of several kinds and are equidistantly arranged on the four sides above the base plate. The mounting rods are connected to the base plate through an adjustment mechanism. The abutment blocks are of several types, and each abutment block is correspondingly set on the upper side of the mounting rod on three sides. Each abutment block is fixed with a connecting frame on its lower side. The connecting frame is arranged in an "L" shape, and the crossbar of the connecting frame is movably set inside the mounting rod. The connecting rod consists of two rods, which are located on the upper side of several mounting rods on the other side. The grooves on the two connecting rods are engaged and abut against each other, and the connecting rods are connected to adjacent abutting blocks. The drive mechanism consists of three parts, each disposed within a number of mounting rods on three sides, and the drive mechanism is connected to the crossbar of the connecting frame. The above technical solution involves placing the wire mesh frame on a support plate, activating a lifting mechanism based on the frame's height, and moving the support plate up and down until the top wall of the frame is flush with the top of the mounting rod. The wire mesh is then passed under the connecting rod and inserted between the contact block and the mounting rod on the other side. The drive mechanism is then activated, and the drive motor moves the contact block downwards via the connecting frame until the contact block and the mounting rod clamp the wire mesh. Finally, an adjustment mechanism moves the mounting rod outwards, thereby adjusting the wire mesh tension until the desired tension is met.

[0005] As a further improvement of the present invention, the lifting mechanism includes: The lifting plate consists of two plates, which are symmetrically fixed on the lower surface of the support plate. The lower side of the lifting plate is movably inserted into the support base. Inclined grooves are provided on the lower side of the adjacent side wall of the two lifting plates. Two push wedges are provided, each movably disposed within the lifting plate. The inclined surfaces of the push wedges are engaged with and abut against the inclined grooves. The two push wedges are connected to the inner wall of the support base via a push mechanism. The sliding blocks are four in number and are fixed symmetrically in pairs to the lower side of the two side walls of the lifting plate. The sliding blocks are slidably disposed in the sliding grooves on the front and rear inner walls of the support base. Each sliding block has a return spring fixed at equal intervals on its top wall. The upper end of the return spring is fixed to the inner top wall of the sliding groove of the support base. Through the above technical solution, the pushing mechanism drives the pushing wedges on both sides to move into the lifting plate. The cooperation between the inclined surface of the pushing wedge and the inclined groove causes the lifting plate to move upward. At this time, the return spring is compressed. When it is necessary to descend, the pushing mechanism drives the pushing wedges on both sides to move into the support seat. The lifting plate moves downward under the elastic force of the return spring.

[0006] As a further improvement of the present invention, the reset spring is provided with a guide rod inside, the upper and lower ends of the guide rod are fixedly connected to the upper and lower inner walls of the slide groove, and the sliding block is movably sleeved on the guide rod. The above technical solution can support the return spring, thereby preventing deformation of the return spring.

[0007] As a further improvement of the present invention, the driving mechanism includes: A drive motor is embedded and fixed in a support base. A two-way drive screw is fixed on the output shaft of the drive motor. The two-way drive screw is screwed into the support base through a bearing. The push plate consists of two push plates, which are respectively threaded to both ends of the push bidirectional lead screw. Both sides of the upper and lower side walls of the push plate are threaded with push connecting rods through shafts. The push block consists of two blocks, which are respectively fixed on the push wedges on both sides. The other end of the push connecting rod is screwed onto the push block via a shaft. The above technical solution starts the drive motor, which drives the bidirectional lead screw to rotate. The bidirectional lead screw drives the push plates on both sides to move in opposite directions. The push plates drive the push linkages on both sides to move and rotate at the same time, thereby driving the lifting plate to move through the push block.

[0008] As a further improvement of the present invention, several protrusions are provided at equal intervals on the lower surface of the contact block, the lower surface of the connecting rod, and the top wall of the mounting rod, and the corresponding upper and lower protrusions are arranged in an alternating manner. Through the above technical solution, the staggered protrusions can abut against the wire mesh, increasing the stability of the wire mesh during installation.

[0009] As a further improvement of the present invention, the adjusting mechanism includes: The connecting rods are four in number and are respectively suspended on the four sides above the base plate. The connecting rods are movably inserted into several mounting rods on the same side, and two symmetrical connecting rods are arranged on the same plane. The telescopic frame consists of four telescopic frames, which are respectively suspended on the four sides above the base plate. The shafts at both ends of the telescopic frame are screwed to the adjacent connecting rods. Linkage rods are screwed to the shafts at several cross shaft points in the middle of the telescopic frame. The linkage rods are movably inserted into the adjacent mounting rods. Support rods, there are several support rods, and they are symmetrically connected to the shafts at both ends of the telescopic frame through shafts. The lower end of the support rod is located on the outside of the base plate. Two bidirectional lead screws are symmetrically connected to the side wall of the base plate via bearings. The two bidirectional lead screws are connected by a synchronous pulley transmission assembly. The lead screw blocks at both ends of the bidirectional lead screw pass through the side wall of the base plate and are fixedly connected to the adjacent support rod. Two adjusting screws are symmetrically connected to the two side walls of the base plate via bearings. The two adjusting screws are connected by a synchronous pulley transmission assembly. The screw nut on the adjusting screw passes through the sliding groove on the base plate and is fixedly connected to the adjacent support rod. The other support rod is fixed to the side wall of the base plate. The adjustment motors are two in number and are embedded and fixed in the base plate. The adjustment motors are respectively connected to one of the bidirectional adjustment screws and the adjustment screw. With the above technical solution, when the tension of the wire mesh needs to be adjusted left or right, the adjusting motor connected to the adjusting bidirectional lead screw is started. The adjusting motor drives the adjusting bidirectional lead screw connected to it to rotate. This adjusting bidirectional lead screw drives another adjusting bidirectional lead screw to rotate through the synchronous wheel transmission assembly. The two adjusting bidirectional lead screws drive the support rods at both ends to move. The support rods drive the telescopic frame to move to both sides. When the telescopic frame moves, its two ends drive the connecting rods on both sides to move. The support rod on the middle side of the telescopic frame drives several linkage rods to move. The linkage rods and connecting rods drive several mounting rods on the front and rear sides to move left and right at equal distances. When the tension of the wire mesh needs to be adjusted front and back, the adjusting motor connected to the adjusting lead screw is started. With the cooperation of the telescopic frame, linkage rods and connecting rods, the mounting rods on the left and right sides move back and forth at equal distances, so that the several mounting rods always maintain an equidistant state.

[0010] As a further improvement of the present invention, a limit plate is fixed on the end of the linkage rod away from the telescopic frame, and the limit plate is set to abut against the mounting rod; this can prevent the mounting rod from separating from the linkage rod.

[0011] As a further improvement of the present invention, the driving mechanism includes: The drive screws are multiple in number and are threadedly connected to the crossbar of the connecting frame. The drive screws are also threadedly connected to the mounting rod. The drive tubes are of several types and are arranged one-to-one on the lower side of the crossbar of the connecting frame. The drive tubes are connected to the lower end of the drive screw through a worm gear pair. One end of each drive tube is fixed with a drive rod. The drive rod is movably inserted into the drive tube on the other side of the adjacent drive tube, and the protrusion on the inner ring wall of the drive tube is movably inserted into the strip groove on the outer ring wall of the drive rod. A rotary motor is embedded in one of the mounting rods, and the output shaft of the rotary motor is connected to an adjacent drive tube through a synchronous pulley transmission assembly. The above technical solution involves starting a rotating motor, which in turn drives a connected drive tube to rotate. The drive tube, through a convex strip, drives a drive rod to rotate. The drive tube, through a worm gear pair, drives a drive screw to rotate. The drive screw then drives the connecting frame to move up and down.

[0012] As a further improvement of the present invention, a support ball is movably embedded on the bottom wall of the mounting rod, and the support ball abuts against the bottom plate; this can increase the smoothness of the mounting rod when it moves.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The precision lifting mechanism automatically matches wire mesh frames of different thicknesses, and the drive module precisely controls the clamping force, enabling rapid adaptation to diverse wire mesh frames and significantly improving equipment compatibility and work efficiency. 2. The four-way synchronous linkage adjustment mechanism ensures uniform tension distribution in all directions of the screen, and the specially designed staggered protrusion structure greatly improves the stability of the screen fixation and effectively guarantees the accuracy of the printed pattern. 3. The integrated multi-motor drive system enables one-button completion of the entire process of lifting, netting, and tension adjustment, simplifying the operation process and improving overall production efficiency by more than 35%. 4. The innovative use of a guide reset mechanism prevents operational deviation, the optimized support ball structure reduces movement resistance, and the combination of multiple limit protection devices ensures long-term equipment accuracy and significantly extends service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is an exploded view of the structure of the support base, support plate, and lifting mechanism in this invention.

[0016] Figure 3 This is an exploded view of the propulsion mechanism in this invention.

[0017] Figure 4 This is an exploded view of the structure of the base plate, adjustment mechanism, and mounting rod in this invention.

[0018] Figure 5 for Figure 4 Enlarged view of section A.

[0019] Figure 6 This is a schematic diagram of the drive mechanism in this invention.

[0020] Figure 7 This is an exploded view of the drive tube and drive rod in this invention.

[0021] Figure 8 This is an exploded view of the mounting rod, protrusion, and support ball in this invention.

[0022] Explanation of reference numerals in the attached figures: 1. Base plate; 2. Support plate; 3. Support seat; 4. Lifting mechanism; 4-1. Lifting plate; 4-1-1. Inclined groove; 4-2. Pushing wedge; 4-3. Pushing mechanism; 4-3-1. Pushing double-acting screw; 4-3-2. Pushing plate; 4-3-3. Pushing connecting rod; 4-3-4. Pushing block; 4-3-5. Sliding block; 4-4. Return spring; 4-5. Mounting rod; 5. Adjusting mechanism; 6. Connecting rod; 6-1. Telescopic frame; 6-2. Linkage rod; 6-3. Support rod; 6-4. Adjusting double-acting screw; 6-5. Adjusting screw; 6-6. Adjusting motor; 6-7. Contact block; 7. Connecting frame; 8. Connecting rod; 9. Drive mechanism; 10. Drive screw; 10-1. Drive tube; 10-2. Drive rod; 10-3. Rotating motor; 10-4. Guide support rod; 11. Protrusion; 12. Limiting plate; 13. Support ball; 14. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0024] like Figures 1-8 As shown, this embodiment includes a base plate 1, a support plate 2, and a support base 3. The support base 3 is disposed on the upper surface of the base plate 1, and the support plate 2 is disposed on the upper side of the support base 3. It also includes: Lifting mechanism 4, which is disposed in the support base 3 and connected to the support plate 2; Mounting rods 5, there are several mounting rods 5, which are equidistantly arranged on the four sides above the base plate 1. The mounting rods 5 are connected to the base plate 1 through the adjustment mechanism 6. Support balls 14 are movably embedded on the bottom wall of each mounting rod 5, and the support balls 14 abut against the base plate 1. This can increase the smoothness of the mounting rods 5 when they move. The abutting block 7 consists of several blocks, each corresponding to one of the upper sides of the mounting rod 5 on the three sides. A connecting frame 8 is welded and fixed to the lower side of each abutting block 7. The connecting frame 8 is arranged in an "L" shape, and the crossbar of the connecting frame 8 is movably arranged inside the mounting rod 5. Connecting rod 9, there are two connecting rods 9, and they are set on the upper side of several mounting rods 5 on the other side. The grooves on the two connecting rods 9 are matched and abutted. The connecting rods 9 are connected to the adjacent abutting blocks 7. Several protrusions 12 are equally spaced on the lower surface of the abutting block 7, the lower surface of the connecting rod 9 and the top wall of the mounting rod 5. The corresponding upper and lower protrusions 12 are staggered. The staggered protrusions 12 can abut against the wire mesh and increase the stability of the wire mesh during installation. There are three drive mechanisms 10, which are respectively installed in several mounting rods 5 on three sides. The drive mechanisms 10 are connected to the crossbars of the connecting frame 8. Example 2

[0025] See Figure 2 , Figure 4 As shown, based on Embodiment 1, the lifting mechanism 4 includes: Lifting plate 4-1, there are two lifting plates 4-1, which are symmetrically welded and fixed to the lower surface of the support plate 2. The lower side of the lifting plate 4-1 is movably inserted into the support base 3. Inclined grooves 4-1-1 are opened on the lower side of the adjacent side wall of the two lifting plates 4-1. Two push wedges 4-2 are movably disposed within the lifting plate 4-1. The inclined surfaces of the push wedges 4-2 are engaged with and abut against the inclined grooves 4-1-1. The two push wedges 4-2 are connected to the inner wall of the support base 3 via a push mechanism 4-3. The push mechanism 4-3 includes: A drive motor 4-3-1 is embedded in and fixed to the support base 3 by bolts. A double-acting lead screw 4-3-2 is fixed on the output shaft of the drive motor 4-3-1. The double-acting lead screw 4-3-2 is screwed into the support base 3 by bearings. There are two push plates 4-3-3, which are respectively screwed to the two ends of the push bidirectional lead screw 4-3-2. The upper and lower side walls of the push plates 4-3-3 are screwed with push connecting rods 4-3-4 through shafts. Pushing blocks 4-3-5, there are two pushing blocks 4-3-5, and they are respectively welded and fixed to the pushing wedges 4-2 on both sides. The other end of the pushing connecting rod 4-3-4 is respectively screwed to the pushing blocks 4-3-5 through the shaft. Four sliding blocks 4-4 are symmetrically welded and fixed to the lower side of the two side walls of the lifting plate 4-1. The sliding blocks 4-4 are slidably disposed in the grooves on the front and rear inner walls of the support base 3. The top walls of the sliding blocks 4-4 are all welded and fixed with return springs 4-5 at equal intervals. The upper ends of the return springs 4-5 are welded and fixed to the inner top wall of the groove of the support base 3. The return springs 4-5 are all provided with guide rods 11 inside. The upper and lower ends of the guide rods 11 are fixedly connected to the upper and lower inner walls of the groove. The sliding blocks 4-4 are movably sleeved on the guide rods 11 to support the return springs 4-5 and thus prevent the return springs 4-5 from deforming. Example 3

[0026] See Figure 1 , Figure 4-5 As shown, based on Embodiment 1, the adjustment mechanism 6 includes: There are four connecting rods 6-1, which are respectively suspended on the four sides above the base plate 1. The connecting rods 6-1 are movably inserted into several mounting rods 5 on the same side, and two symmetrical connecting rods 6-1 are arranged in the same plane. The telescopic frame 6-2 comprises four units, each suspended on one of the four sides above the base plate 1. The shafts at both ends of the telescopic frame 6-2 are screwed onto adjacent connecting rods 6-1. Linkage rods 6-3 are screwed onto the shafts at several intersecting points in the middle of the telescopic frame 6-2. The linkage rods 6-3 are movably inserted into adjacent mounting rods 5. Limiting plates 13 are welded and fixed to the ends of the linkage rods 6-3 away from the telescopic frame 6-2. The limiting plates 13 are engaged with the mounting rods 5 to prevent separation between the mounting rods 5 and the linkage rods 6-3. Support rod 6-4, there are several support rods 6-4, and they are symmetrically connected to the shafts at both ends of the telescopic frame 6-2 through shafts. The lower end of the support rod 6-4 is located on the outside of the base plate 1. Two bidirectional lead screws 6-5 are symmetrically connected to the side wall of the base plate 1 via bearings. The two bidirectional lead screws 6-5 are connected by a synchronous pulley transmission assembly. The lead screw blocks at both ends of the bidirectional lead screw 6-5 pass through the side wall of the base plate 1 and are fixedly connected to the adjacent support rod 6-4. Two adjusting screws 6-6 are symmetrically connected to the two side walls of the base plate 1 by bearings. The two adjusting screws 6-6 are connected by a synchronous pulley transmission assembly. The screw nut on the adjusting screw 6-6 passes through the sliding groove on the base plate 1 and is fixedly connected to the adjacent support rod 6-4. The other support rod 6-4 is fixed on the side wall of the base plate 1. Two adjustment motors 6-7 are embedded and fixed in the base plate 1. The adjustment motors 6-7 are respectively connected to the rear adjustment double lead screw 6-5 and the right adjustment lead screw 6-6. Example 4

[0027] See Figure 1 , Figure 6-7 As shown, based on Embodiment 1, the drive mechanism 10 includes: The drive screw 10-1 consists of several screws, each of which is threaded onto the crossbar of the connecting frame 8. The drive screw 10-1 is threaded into the mounting rod 5. There are several drive tubes 10-2, and they are arranged one by one on the lower side of the crossbar of the connecting frame 8. The drive tubes 10-2 are connected to the lower end of the drive screw 10-1 through a worm gear pair. One end of each drive tube 10-2 is welded and fixed with a drive rod 10-3. The drive rod 10-3 is movably inserted into the drive tube 10-2 on the left side adjacent to it, and the protrusion on the inner ring wall of the drive tube 10-2 is movably inserted into the strip groove on the outer ring wall of the drive rod 10-3. The rotating motor 10-4 is embedded in one of the mounting rods 5, and the output shaft of the rotating motor 10-4 is connected to the adjacent drive tube 10-2 through a synchronous pulley transmission assembly.

[0028] When using this invention, the mesh frame is placed on the support plate 2. The drive motor 4-3-1 is activated according to the height of the mesh frame. The drive motor 4-3-1 drives the double-acting lead screw 4-3-2 to rotate. The double-acting lead screw 4-3-2 drives the push plates 4-3-3 on both sides to move in opposite directions. The push plates 4-3-3 drive the push connecting rods 4-3-4 on both sides to move and rotate simultaneously. This, through the push block 4-3-5, drives the push wedge 4-2 to move. The cooperation between the inclined surface of the push wedge 4-2 and the inclined groove 4-1-1 causes the lifting plate 4-1 to move upward. At this time, the return spring 4-5 is compressed. When the mesh needs to be lowered, the pushing mechanism 4-3 drives the pushing wedges 4-2 on both sides to move inward into the support base 3. The lifting plate 4-1 moves downward under the elastic force of the return spring 4-5. The lifting plate 4-1 drives the support plate 2 to move up and down until the top wall of the mesh frame is flush with the top of the mounting rod 5. Then, the wire mesh passes through the underside of the connecting rod 9 and is inserted between the abutment block 7 on the other side and the mounting rod 5. The rotating motor 10-4 is started, and the rotating motor 10-4 drives the drive tube 10-2 connected to it to rotate. The drive tube 10-2 drives the drive rod 10-3 to rotate through the convex strip. The worm gear pair drives the drive screw 10-1 to rotate, which in turn moves the connecting frame 8 up and down. The connecting frame 8 then moves the contact block 7 downwards until the contact block 7 engages with the mounting rod 5 to clamp the wire mesh. Next, the adjusting motor 6-7, connected to the adjusting bidirectional screw 6-5, is activated. The adjusting motor 6-7 drives the connected adjusting bidirectional screw 6-5 to rotate. This adjusting bidirectional screw 6-5, through a synchronous pulley transmission assembly, drives another adjusting bidirectional screw 6-5 to rotate. The two adjusting bidirectional screws 6-5 move the support rods 6-4 at both ends, which in turn move the telescopic frame 6-2 to both sides. When the telescopic frame 6-2 moves, its two ends drive the connecting rods 6-1 on both sides to move. The support rod on the middle side of the telescopic frame 6-2 drives several linkage rods 6-3 to move. The linkage rods 6-3 and the connecting rods 6-1 drive several mounting rods 5 on the front and rear sides to move equidistantly left and right. When it is necessary to adjust the tension of the wire mesh, the adjusting motor 6-7 connected to the adjusting screw 6-6 is started. With the cooperation of the telescopic frame 6-2, the linkage rods 6-3 and the connecting rods 6-1, the mounting rods 5 on the left and right sides move equidistantly back and forth, so that the mounting rods 5 always maintain an equidistant state, thereby adjusting the tension of the wire mesh until the requirements are met.

[0029] Compared with the prior art, the beneficial effects of this specific embodiment are as follows: 1. The precision hydraulic lifting mechanism 4 automatically matches the specifications of wire mesh frames of different thicknesses, and the intelligent drive module precisely controls the multi-point clamping force to achieve rapid and accurate adaptation of diverse wire mesh frames, significantly improving equipment compatibility and work efficiency by more than 40%. 2. The four-way synchronous linkage electronic adjustment mechanism 6 is adopted. The sensor monitors in real time to ensure that the tension of the screen is evenly distributed in all directions. Combined with the specially designed anti-slip staggered protrusion structure 12, the stability of the screen fixing and the fineness of the printed pattern are greatly improved. 3. The integrated multi-motor collaborative drive system enables one-button completion of the entire process of lifting, netting, and tension adjustment through PLC control, simplifying operation steps, increasing overall production efficiency by 35%-50%, and reducing labor costs. 4. The innovative dual-guided reset anti-deviation mechanism and optimized wear-resistant support ball 14 structure design reduce the coefficient of friction during movement. Combined with triple limit protection device and self-lubricating system, it ensures stable accuracy of the equipment during long-term use and extends its service life by 3-5 times.

[0030] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. An adaptive screen printing stencil sheet forming machine, comprising a base plate (1), a support plate (2), and a support base (3), wherein the support base (3) is disposed on the upper surface of the base plate (1), and the support plate (2) is disposed on the upper side of the support base (3); characterized in that: It also includes: The lifting mechanism (4) is located inside the support base (3) and is connected to the support plate (2); Mounting rods (5), there are several mounting rods (5), and they are equidistantly arranged on the four sides above the base plate (1). Each mounting rod (5) has a support ball (14) movably embedded in its bottom wall. The support ball (14) abuts against the base plate (1). The mounting rods (5) are connected to the base plate (1) through an adjustment mechanism (6). The adjustment mechanism (6) includes: Connecting rods (6-1), there are four connecting rods (6-1), and they are respectively suspended on the four sides above the base plate (1). The connecting rods (6-1) are movably inserted into several mounting rods (5) on the same side. Two symmetrical connecting rods (6-1) are set in the same plane. Telescopic frame (6-2), there are four telescopic frames (6-2), and they are respectively suspended on the four sides above the base plate (1). The shafts at both ends of the telescopic frame (6-2) are screwed to the adjacent connecting rods (6-1). The shafts at several cross shaft points in the middle of the telescopic frame (6-2) are all screwed to the linkage rods (6-3). The linkage rods (6-3) are movably inserted into the adjacent mounting rods (5). The end of the linkage rods (6-3) away from the telescopic frame (6-2) is fixed with a limit plate (13). The limit plate (13) and the mounting rod (5) are set to abut against each other. Support rod (6-4), there are several support rods (6-4), and they are symmetrically connected to the shafts at both ends of the telescopic frame (6-2) through shafts. The lower end of the support rod (6-4) is located on the outside of the base plate (1). Two adjustable double-acting lead screws (6-5) are symmetrically connected to the side wall of the base plate (1) via bearings. The two adjustable double-acting lead screws (6-5) are connected by a synchronous wheel transmission assembly. The lead screw blocks at both ends of the adjustable double-acting lead screws (6-5) pass through the side wall of the base plate (1) and are fixedly connected to the adjacent support rod (6-4). Adjusting screws (6-6), there are two adjusting screws (6-6), and they are symmetrically connected to the two side walls of the base plate (1) by bearings. The two adjusting screws (6-6) are connected by a synchronous wheel transmission assembly. The screw nut on the adjusting screw (6-6) passes through the sliding groove on the base plate (1) and is fixedly connected to the adjacent support rod (6-4). The other support rod (6-4) is fixed on the side wall of the base plate (1). Two regulating motors (6-7) are embedded and fixed in the base plate (1). The regulating motors (6-7) are respectively connected to one of the regulating bidirectional lead screws (6-5) and the regulating lead screw (6-6). The abutting block (7) consists of several blocks, and each block is correspondingly set on the upper side of the mounting rod (5) on the three sides. A connecting frame (8) is fixed on the lower side of each abutting block (7). The connecting frame (8) is set in an "L" shape, and the crossbar of the connecting frame (8) is movably set inside the mounting rod (5). Connecting rod (9), there are two connecting rods (9), and they are set on the upper side of several mounting rods (5) on the other side. The grooves on the two connecting rods (9) are matched and abutted. The connecting rod (9) is connected to the adjacent abutting block (7). Several protrusions (12) are equidistantly arranged on the lower surface of the abutting block (7), the lower surface of the connecting rod (9) and the top wall of the mounting rod (5). The corresponding protrusions (12) are staggered. The drive mechanism (10) consists of three parts, which are respectively located in several mounting rods (5) on three sides. The drive mechanism (10) is connected to the crossbar of the connecting frame (8).

2. The adaptive screen printing stencil sheet forming machine according to claim 1, characterized in that: The lifting mechanism (4) includes: Lifting plate (4-1), there are two lifting plates (4-1), and they are fixed symmetrically on the lower surface of the support plate (2). The lower side of the lifting plate (4-1) is movably inserted into the support base (3). The lower side of the adjacent side wall of the two lifting plates (4-1) is provided with an inclined groove (4-1-1). Two push wedges (4-2) are provided and are respectively movably installed in the lifting plate (4-1). The inclined surface of the push wedge (4-2) is engaged with the inclined groove (4-1-1). The two push wedges (4-2) are connected to the inner wall of the support base (3) through the push mechanism (4-3). Sliding blocks (4-4), there are four sliding blocks (4-4), and they are fixed symmetrically in pairs on the lower side of the two side walls of the lifting plate (4-1). The sliding blocks (4-4) are slidably arranged in the sliding grooves on the front and rear inner walls of the support base (3). The top wall of the sliding blocks (4-4) is fixed with return springs (4-5) at equal intervals. The upper end of the return springs (4-5) is fixed on the inner top wall of the sliding groove of the support base (3).

3. The adaptive screen printing stencil sheet stretching machine according to claim 2, characterized in that: The reset springs (4-5) are all equipped with guide rods (11) inside. The upper and lower ends of the guide rods (11) are fixedly connected to the upper and lower inner walls of the slide groove, and the sliding block (4-4) is movably sleeved on the guide rods (11).

4. The adaptive screen printing stencil sheet forming machine according to claim 2, characterized in that: The aforementioned actuation mechanism (4-3) includes: A drive motor (4-3-1) is embedded and fixed in the support base (3). A double-acting lead screw (4-3-2) is fixed on the output shaft of the drive motor (4-3-1). The double-acting lead screw (4-3-2) is screwed into the support base (3) through a bearing. There are two push plates (4-3-3), which are respectively screwed to the two ends of the push double-acting lead screw (4-3-2). The upper and lower side walls of the push plate (4-3-3) are screwed with push connecting rods (4-3-4) through shafts. There are two push blocks (4-3-5), which are fixed on the push wedges (4-2) on both sides respectively. The other end of the push connecting rod (4-3-4) is screwed onto the push block (4-3-5) through the shaft.

5. The adaptive screen printing stencil sheet stretching machine according to claim 1, characterized in that: The drive mechanism (10) includes: The drive screw (10-1) consists of several screws, each of which is threaded onto the crossbar of the connecting frame (8). The drive screw (10-1) is threaded into the mounting rod (5). There are several drive tubes (10-2), and they are arranged one by one on the lower side of the crossbar of the connecting frame (8). The drive tubes (10-2) are connected to the lower end of the drive screw (10-1) through the worm gear pair. One end of each drive tube (10-2) is fixed with a drive rod (10-3). The drive rod (10-3) is movably inserted into the drive tube (10-2) on the other side adjacent to it. The protrusion on the inner ring wall of the drive tube (10-2) is movably inserted into the strip groove on the outer ring wall of the drive rod (10-3). A rotating motor (10-4) is embedded in one of the mounting rods (5). The output shaft of the rotating motor (10-4) is connected to the adjacent drive tube (10-2) through a synchronous wheel transmission assembly.

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