Fully automatic net stretching machine

Abstract

The present invention discloses a fully automatic mesh stretching machine, comprising: a first clamping device and a second clamping device; a third clamping device and a fourth clamping device; a third driving shaft and a driven rod of the third driving shaft can jointly control a short side of the first clamping device away from or close to a bottom frame; a fourth driving shaft and a driven rod of the fourth driving shaft can jointly control another short side of the second clamping device away from or close to the bottom frame; a second driven rod of the second driving shaft and a fourth driven rod of the second driving shaft can jointly control a long side of the fourth clamping device away from or close to the bottom frame; and a third driven rod of the second driving shaft and a fifth driven rod of the second driving shaft can jointly control another long side of the third clamping device away from or close to the bottom frame. The present invention discloses a fully automatic mesh stretching machine, which can complete the automatic adjustment of the four-side tensioning devices through chain transmission, and the chain transmission is suitable for long-distance transmission, and has low cost while maintaining an accurate average transmission ratio.

Description

Technical Field

[0001] The invention relates to the field of screen printing plate making auxiliary equipment, in particular to a full-automatic screen stretching machine suitable for screen printing plate making of different sizes. Background Art

[0002] The screen stretching machine is an auxiliary equipment for screen printing plate making. It stretches the screen on the screen frame with a certain tension. Screen stretching is the primary process to achieve screen printing plate making. The quality of screen stretching is related to the quality of plate making and printing.

[0003] The existing mesh stretching machines generally have the following technical defects:

[0004] 1. The clamps of traditional large-scale mechanical screen stretching machines are restricted by the horizontal arms on the four sides, resulting in large tension on the four sides and small tension in the middle. When printing, the ink on the stretched screen cannot return to the starting position, resulting in failure to print. However, in large-scale pneumatic screen stretching machines, the middle part of the four sides of the screen frame is pressed by the clamps, and the screen frame shrinks inward more than the four ends of the screen frame, which causes the four sides of the screen frame to form an inward arc. Due to the large deformation of the screen, the printable area of ​​the screen is inevitably reduced, thereby affecting the effective printing area of ​​the screen.

[0005] 2. Oblique stretching is a necessary means for precision screen production. The existing oblique stretching method is to place the screen frame at a certain angle on the equipment platform, and the screen is placed vertically. This oblique stretching method will waste more than 20% of the screen

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The purpose of the present invention is to provide a fully automatic screen stretching machine, which can complete the automatic adjustment of the four-side tensioning device through chain transmission. At the same time, the chain transmission method is suitable for long-distance transmission, while maintaining an accurate average transmission ratio, the cost is low, and the requirements for the working environment are low.

[0008] To achieve the above-mentioned objectives, the present invention provides a fully automatic mesh stretching machine, comprising: a bottom frame in a rectangular frame structure; a first clamping device and a second clamping device which are mutually parallel and symmetrically arranged on the outer sides of a pair of short sides of the upper plane of the bottom frame; a third clamping device and a fourth clamping device which are mutually parallel and symmetrically arranged on the outer sides of a pair of long sides of the upper plane of the bottom frame; a third driving shaft and a third driving shaft driven rod which are mutually parallel and perpendicular to a short side of the upper plane of the bottom frame and are arranged on one short side, the outer ends of the third driving shaft and the third driving shaft driven rod are vertically connected to the first clamping device, and the third driving shaft and the third driving shaft driven rod can jointly control the first clamping device to move away from or approach to a short side of the bottom frame; a fourth driving shaft and a fourth driving shaft driven rod which are mutually parallel and perpendicular to the other short side of the upper plane of the bottom frame and are arranged on the other short side, the outer ends of the fourth driving shaft and the fourth driving shaft driven rod are vertically connected to the second clamping device, and the fourth driving shaft and the fourth driving shaft driven rod can jointly control the first clamping device to move away from or approach to a short side of the bottom frame; The shaft and the fourth driving shaft driven rod can jointly control the second clamping device to move away from or approach another short side of the bottom frame; the second driving shaft second driven rod and the second driving shaft fourth driven rod are arranged on one long side parallel to each other and perpendicular to a long side of the upper plane of the bottom frame, the outer ends of the second driving shaft second driven rod and the second driving shaft fourth driven rod are vertically connected to the fourth clamping device, the second driving shaft second driven rod and the second driving shaft fourth driven rod can jointly control the third clamping device to move away from or approach another long side of the bottom frame; and the second driving shaft third driven rod and the second driving shaft fifth driven rod are arranged on the other long side parallel to each other and perpendicular to the other long side of the upper plane of the bottom frame, the outer ends of the second driving shaft third driven rod and the second driving shaft fifth driven rod are vertically connected to the third clamping device, the second driving shaft third driven rod and the second driving shaft fifth driven rod can jointly control the fourth clamping device to move away from or approach another long side of the bottom frame.

[0009] In a preferred embodiment, the action of the third clamping device moving away from or approaching one long side of the bottom frame and the action of the fourth clamping device moving away from or approaching another long side of the bottom frame are synchronous actions.

[0010] In a preferred embodiment, the fully automatic mesh stretching machine also includes: a first auxiliary clamping device and a second auxiliary clamping device, which are arranged parallel to and symmetrically on the outer sides of a pair of long sides of the upper plane of the bottom frame, and are located on a side close to the other short side of the upper plane of the bottom frame; a first driving shaft and a first driven rod, which are arranged on one long side perpendicular to a long side of the upper plane of the bottom frame, and are located on a side close to the other short side of the upper plane of the bottom frame, and the outer side of the first driving shaft and the first driven rod are vertically connected to the first auxiliary clamping device; and a first driving shaft and a second driven rod, which are arranged on the other long side perpendicular to the other long side of the upper plane of the bottom frame, and are located on a side close to the other short side of the bottom frame, and the outer side of the first driving shaft and the second driven rod are vertically connected to the second auxiliary clamping device; wherein the first driving shaft and the first driven rod can control the first auxiliary clamping device to move away from or approach to one long side of the upper plane of the bottom frame, and the first driving shaft and the second driven rod can control the second auxiliary clamping device to move away from or approach to the other long side of the upper plane of the bottom frame.

[0011] In a preferred embodiment, the movement of the first auxiliary clamping device moving away from or approaching one long side of the upper plane of the bottom frame and the movement of the second auxiliary clamping device moving away from or approaching another long side of the upper plane of the bottom frame are synchronous movements.

[0012] In a preferred embodiment, the fully automatic screen stretching machine also includes: a first driving shaft and the first driving shaft first driven rod and the first driving shaft second driven rod are arranged on the bottom frame in parallel, and are located below the first driving shaft first driven rod and the first driving shaft second driven rod, and the first driving shaft drives the first driving shaft first driven rod and the first driving shaft second driven rod to rotate synchronously through a chain respectively; the second driving shaft and the second driving shaft second driven rod and the second driving shaft third driven rod are arranged on the bottom frame in parallel, and are located below the second driving shaft second driven rod and the second driving shaft third driven rod The first driven rod of the second driving shaft is arranged in parallel with the fourth driven rod of the second driving shaft and the fifth driven rod of the second driving shaft on the bottom frame, and is located below the fourth driven rod of the second driving shaft and the fifth driven rod of the second driving shaft; wherein the second driving shaft drives the first driven rod of the second driving shaft, the second driven rod of the second driving shaft and the third driven rod of the second driving shaft to rotate synchronously through chains, and at the same time, the first driven rod of the second driving shaft drives the fourth driven rod of the second driving shaft and the fifth driven rod of the second driving shaft to rotate synchronously with the first driven rod of the second driving shaft through chains.

[0013] In a preferred embodiment, the fully automatic screen stretching machine also includes: a first motor is arranged on the bottom frame, and the first motor drives the first driving shaft through a chain; a second motor is arranged on the bottom frame, and the second motor drives the second driving shaft to rotate through a chain; a third motor is arranged on the bottom frame, and the third motor drives the third driving shaft to rotate through a chain, and at the same time, the third driving shaft drives the third driving shaft driven rod through the chain to rotate synchronously with the third driving shaft; and a fourth motor is arranged on the bottom frame, and the fourth motor drives the fourth driving shaft to rotate through a chain, and at the same time, the fourth driving shaft drives the fourth driving shaft driven rod through the chain to rotate synchronously with the fourth driving shaft.

[0014] In a preferred embodiment, the fully automatic mesh stretching machine also includes a platform component, which is arranged above the upper plane of the bottom frame, and the platform component includes: a platform frame is arranged above the upper plane of the bottom frame, and the platform frame is a rectangular frame structure, a pair of short sides of the platform frame are arranged in parallel with the first clamping device and the second clamping device, and a pair of long sides of the platform frame are arranged in parallel with the third clamping device and the fourth clamping device, and the position corresponds to the third clamping device and the fourth clamping device; the first transverse guide shaft, the second transverse guide shaft, the third transverse guide shaft and the fourth transverse guide shaft are arranged on the lower plane of the platform frame in parallel and perpendicular to the pair of long sides of the platform frame; the first longitudinal guide shaft and the second longitudinal guide shaft are arranged on the lower plane of the platform frame in parallel and perpendicular to the pair of short sides of the platform frame, and are located at the short side of the platform frame close to the second clamping device; a plurality of support shaft sleeves, the first transverse guide shaft, the second transverse guide shaft, the third transverse guide shaft and the fourth transverse guide shaft and the first longitudinal guide shaft and the second longitudinal guide shaft are each arranged on the lower plane of the platform frame through at least two support shaft sleeves, and the first transverse guide shaft, the second transverse guide shaft, the third transverse guide shaft and the fourth transverse guide shaft The third transverse guide shaft and the fourth transverse guide shaft as well as the first longitudinal guide shaft and the second longitudinal guide shaft can slide on at least two support sleeves respectively; the first outer pull rod is connected to one end of the first transverse guide shaft and the second transverse guide shaft at the same time, and the first outer pull rod can approach or move away from a long side of the platform frame in parallel through the guidance of the first transverse guide shaft and the second transverse guide shaft; the second outer pull rod is connected to one end of the third transverse guide shaft and the fourth transverse guide shaft at the same time, and the second outer pull rod can approach or move away from another long side of the platform frame in parallel through the guidance of the third transverse guide shaft and the fourth transverse guide shaft; the third outer pull rod is connected to one end of the first longitudinal guide shaft and the second longitudinal guide shaft at the same time, and the third outer pull rod can approach or move away from the short side of the platform frame close to the second clamping device in parallel through the guidance of the first longitudinal guide shaft and the second longitudinal guide shaft; the platform cover plate is laid flat on the upper plane of the platform frame; the electromagnet is arranged on the side of the third outer pull rod facing the second clamping device; and a plurality of connecting parts are distributed on the lower plane of the platform frame; wherein the upper planes of the first outer pull rod, the second outer pull rod and the third outer pull rod are flush with the platform cover plate.

[0015] In a preferred embodiment, the fully automatic stretching machine further includes a lifting device, which includes: a fifth motor arranged on the bottom frame; the lifting device includes a transmission shaft assembly consisting of a fifth driving shaft and a fifth driven shaft. The fifth driving shaft is arranged below the upper plane of the bottom frame, and the fifth motor drives the fifth driving shaft to rotate through a chain. The fifth driven shaft is arranged below the upper plane of the bottom frame in parallel with the fifth driven shaft, and the fifth driving shaft drives the fifth driven shaft to rotate synchronously with the fifth driving shaft through a chain. The eccentric wheel is arranged at both ends of the fifth driving shaft and the fifth driven shaft. One end of the connecting rod is pivotally connected to the edge of the eccentric wheel 502. One end of the platform support rod passes through the lifting guide sleeve arranged on the bottom frame and is fixedly connected to the connecting part of the platform frame, and the other end is pivotally connected to the other end of the connecting rod; wherein, while the fifth motor drives the fifth driving shaft and the fifth driven shaft to rotate synchronously, the eccentric wheel drives the platform support rod to make vertical movement in the lifting guide sleeve through the connecting rod, thereby driving the platform assembly to perform vertical lifting.

[0016] In a preferred embodiment, the fully automatic screen stretching machine also includes a plurality of transverse guide shafts and a plurality of longitudinal guide shafts; the plurality of transverse guide shafts are parallel to each other and are arranged on the upper plane of the bottom frame perpendicular to a pair of long sides of the upper plane of the bottom frame, one end of each transverse guide shaft is inserted into a transverse guide sleeve arranged on the upper plane of the bottom frame, and the other end is vertically connected to one of the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device, when the third clamping device, the fourth clamping device, the first auxiliary clamping device and the When the second auxiliary clamping device is translated, each transverse guide shaft can slide in the transverse guide sleeve accordingly; multiple longitudinal guide shafts are parallel to each other and are arranged on the upper plane of the bottom frame perpendicular to a pair of short sides of the upper plane of the bottom frame, and are located at one end close to the second clamping device, one end of each longitudinal guide shaft is passed through the longitudinal guide sleeve arranged on the upper plane of the bottom frame, and the other end is vertically connected to the second clamping device, and when the second clamping device is translated, each longitudinal guide shaft can slide in the longitudinal guide sleeve along with the second clamping device.

[0017] In a preferred embodiment, the first clamping device, the second clamping device, the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device all include multiple clamping heads, each clamping head includes a pneumatic locking device, and the first clamping device, the second clamping device, the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device also include a fixed clamping head and a pressing clamping head; the fixed clamping head is arranged below the multiple pneumatic locking devices; the pressing clamping head is arranged between the multiple pneumatic locking devices and the fixed clamping heads, and the pressing clamping heads and the fixed clamping heads are provided with mutually matching pressing teeth on the relative planes; wherein the pneumatic locking devices located at both ends of the first clamping device, the second clamping device, the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device are connected to the upper planes at both ends of the pressing clamping heads by bolts.

[0018] Compared with the prior art, the fully automatic screen stretching machine of the present invention has the following beneficial effects:

[0019] 1. The fully automatic screen stretching machine of the present invention adopts a combination of chain drive and screw drive to achieve the adjustment of the four-side tensioning device; the chain drive method is suitable for long-distance transmission, while maintaining an accurate average transmission ratio, the cost is low, and the requirements for the working environment are low;

[0020] 2. The horizontal long edge tensioning device is divided into two parts, which can be adjusted separately, suitable for the production of large screens and small screens respectively; it can also be adjusted at the same time. These three methods are suitable for the production of screens of different sizes;

[0021] 3. The longitudinal short side tensioning device is controlled by two motors respectively, and the tensioning parameters can be adjusted according to the needs of the stretching net;

[0022] 4. The tensioning devices on both sides of the fully automatic screen stretching machine of the present invention are equipped with four sets of guide shafts, and the tensioning device on the short side is equipped with two sets of guide shafts (depending on the size of the screen to be produced, the fully automatic screen stretching machine of the present invention can be equipped with 2-8 sets of shafts), which further prevents the bending deformation of the tensioning device;

[0023] 5. The platform and tensioning device of the fully automatic mesh stretching machine of the present invention are respectively equipped with electromagnets, which assist the platform to move toward the tensioning device on that side, thereby expanding the mesh stretching area and replacing manual dragging;

[0024] 6. The tensioning device of the fully automatic mesh stretching machine of the present invention is equipped with a distance sensor, which can transmit the displacement back to the controller in real time. It is driven by a servo motor or an asynchronous motor, and cooperates with an encoder to realize the displacement control of the tensioning device. Only the tensioning parameters need to be manually input, and the mesh stretching process is automatically controlled, so that fully automatic mesh stretching can be realized;

[0025] 7. The bottom of the working platform of the fully automatic screen stretching machine of the present invention is equipped with 6 groups but not limited to 6 groups of platform support shafts to prevent the platform from deforming and affecting the horizontality of the screen frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional schematic diagram of a fully automatic screen stretching machine according to an embodiment of the present invention;

[0027] Figure 2 is a schematic front view of a fully automatic screen stretching machine according to an embodiment of the present invention;

[0028] Figure 3 is a top view schematic diagram of a fully automatic screen stretching machine according to an embodiment of the present invention;

[0029] Figure 4 is a top view schematic diagram of a fully automatic screen stretching machine according to an embodiment of the present invention;

[0030] Figure 5 is a rear view schematic diagram of a fully automatic screen stretching machine according to an embodiment of the present invention;

[0031] Figure 6 is a right side schematic diagram of a fully automatic screen stretching machine according to an embodiment of the present invention;

[0032] Figure 7 2 is a left schematic diagram of a fully automatic screen stretching machine according to an embodiment of the present invention;

[0033] Figure 8 is a cross-sectional schematic diagram of a third driving shaft according to an embodiment of the present invention;

[0034] Fig. 9 is a bottom view schematic diagram of a platform frame according to an embodiment of the present invention;

[0035] Fig.10 is a schematic structural diagram of a lifting device according to an embodiment of the present invention;

[0036] Fig.11 is a partial enlarged schematic diagram of a clamping device according to an embodiment of the present invention;

[0037] Fig.12 yes Figure 4 A local enlarged schematic diagram of point A;

[0038] Fig.13 is a schematic structural diagram of a first driving shaft according to an embodiment of the present invention;

[0039] Fig.14 is a schematic structural diagram of a second driving shaft according to an embodiment of the present invention;

[0040] Fig.15 Schematic diagram of the structure of the first driven rod of the second driving shaft according to an embodiment of the present invention.

[0041] Description of main reference numerals:

[0042] 1-first motor; 101-first driving shaft; 102-first driven rod of first driving shaft; 103-second driven rod of first driving shaft; 2-second motor; 201-second driving shaft; 202-first driven rod of second driving shaft; 203-second driven rod of second driving shaft; 204-third driven rod of second driving shaft; 205-fourth driven rod of second driving shaft; 206-fifth driven rod of second driving shaft; 3-third motor; 301-third driving shaft; 3011-sprocket; 3012-screw; 3013-bearing; 3014-sleeve; 3015-thread sleeve; 302-driven rod of third driving shaft; 4-fourth motor; 401-fourth driving shaft; 402driven rod of fourth driving shaft; 5-fifth motor; 501- Transmission shaft assembly; 502-eccentric wheel; 503-platform support rod; 504-linking rod; 601-lateral guide support shaft; 602-longitudinal guide support shaft; 701-first clamping device; 702-second clamping device; 703-third clamping device; 704-fourth clamping device; 705-first auxiliary clamping device; 706-second auxiliary clamping device; 707-electromagnet; 708-fixing chuck; 709-pressing chuck; 710-pneumatic locking device; 8-platform assembly, 801-platform frame; 802-supporting shaft sleeve; 8021-first lateral guide shaft, 8022-second lateral guide shaft; 8023-third lateral guide shaft; 8024-fourth lateral guide shaft; 8025-first longitudinal guide shaft; 8026-second longitudinal guide shaft; 803-platform cover; 804-electromagnet; 805-first outer pull rod; 806-second outer pull rod; 807-third outer pull rod; 808-connecting part; 9-bottom frame; 10-electrical box; 11-baffle; 12-foot; 13-castor; 14-lifting guide sleeve. DETAILED DESCRIPTION

[0043] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0044] Unless explicitly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising" etc. will be understood to include the stated components or parts but not to exclude other components or parts.

[0045] like Figures 1 to 7As shown, a fully automatic screen stretching machine according to a preferred embodiment of the present invention comprises: a bottom frame 9 of a rectangular frame structure. Baffles 11 are arranged around the bottom frame 9, and feet 12 and casters 13 that can be adjusted in height are arranged at the four corners and the middle of the lower plane. A first clamping device 701 and a second clamping device 702 are arranged parallel to each other and symmetrically on the outer side of a pair of short sides of the upper plane of the bottom frame 9. A third clamping device 703 and a fourth clamping device 704 are arranged parallel to each other and symmetrically on the outer side of a pair of long sides of the upper plane of the bottom frame 9. A third driving shaft 301 and a third driving shaft driven rod 302 are arranged on a short side parallel to each other and perpendicular to a short side of the upper plane of the bottom frame 9, and the outer ends of the third driving shaft 301 and the third driving shaft driven rod 302 are vertically connected to the first clamping device 701, and the third driving shaft 301 and the third driving shaft driven rod 302 can jointly control the first clamping device 701 to move away from or close to a short side of the bottom frame 9. The fourth driving shaft 401 and the fourth driving shaft driven rod 402 are arranged on the other short side in parallel with each other and perpendicular to the other short side of the upper plane of the bottom frame 9. The outer ends of the fourth driving shaft 401 and the fourth driving shaft driven rod 402 are vertically connected to the second clamping device 702. The fourth driving shaft 401 and the fourth driving shaft driven rod 402 can jointly control the second clamping device 702 to move away from or close to the other short side of the bottom frame 9. The second driving shaft second driven rod 203 and the second driving shaft fourth driven rod 205 are arranged on one long side in parallel with each other and perpendicular to the one long side of the upper plane of the bottom frame 9. The outer ends of the second driving shaft second driven rod 203 and the second driving shaft fourth driven rod 205 are vertically connected to the third clamping device 703. The second driving shaft second driven rod 203 and the second driving shaft fourth driven rod 205 can jointly control the third clamping device 703 to move away from or close to the one long side of the bottom frame 9. The second driving shaft third driven rod 204 and the second driving shaft fifth driven rod 206 are arranged on the other long side in parallel with each other and perpendicular to the other long side of the upper plane of the bottom frame 9. The outer ends of the second driving shaft third driven rod 204 and the second driving shaft fifth driven rod 206 are vertically connected to the fourth clamping device 704. The second driving shaft third driven rod 204 and the second driving shaft fifth driven rod 206 can jointly control the fourth clamping device 704 to move away from or close to the other long side of the bottom frame 9.

[0046] In some embodiments, the third clamping device 703 moves away from or approaches one long side of the bottom frame 9 and the fourth clamping device 704 moves away from or approaches another long side of the bottom frame 9 in a synchronous manner. That is, the third clamping device 703 and the fourth clamping device 704 either move away from or approach each other at the same time.

[0047] In some embodiments, the fully automatic screen stretching machine further includes: a first auxiliary clamping device 705 and a second auxiliary clamping device 706 which are arranged parallel to and symmetrically on the outer side of a pair of long sides of the upper plane of the bottom frame 9 and are located on one side of the other short side of the upper plane of the bottom frame 9. A first driving shaft first driven rod 102 which is arranged on one long side perpendicular to one long side of the upper plane of the bottom frame 9 and is located on one side of the other short side of the upper plane of the bottom frame 9, and the outer side of the first driving shaft first driven rod 102 is vertically connected to the first auxiliary clamping device 705. And a first driving shaft second driven rod 103 which is arranged on the other long side perpendicular to the other long side of the upper plane of the bottom frame 9 and is located on one side of the other short side of the bottom frame 9, and the outer side of the first driving shaft second driven rod 103 is vertically connected to the second auxiliary clamping device 706. The first active shaft first driven rod 102 can control the first auxiliary clamping device 705 to move away from or close to one long side of the upper plane of the bottom frame 9 , and the first active shaft second driven rod 103 can control the second auxiliary clamping device 706 to move away from or close to the other long side of the upper plane of the bottom frame 9 .

[0048] In some embodiments, the movement of the first auxiliary clamping device 705 away from or approaching one long side of the upper plane of the bottom frame 9 and the movement of the second auxiliary clamping device 706 away from or approaching another long side of the upper plane of the bottom frame 9 are synchronized movements. That is to say, the movement of the first auxiliary clamping device 705 and the second auxiliary clamping device 706 is the same as that of the third clamping device 703 and the fourth clamping device 704, either away from or approaching at the same time. The movement of the first auxiliary clamping device 705 and the second auxiliary clamping device 706 and the movement of the third clamping device 703 and the fourth clamping device 704 can be synchronized at the same time, or the first auxiliary clamping device 705 and the second auxiliary clamping device 706 can move separately, or the third clamping device 703 and the fourth clamping device 704 can move separately.

[0049] In some embodiments, the fully automatic screen stretching machine further includes: the first driving shaft 101 is arranged on the bottom frame 9 in parallel with the first driving shaft first driven rod 102 and the first driving shaft second driven rod 103, and is located below the first driving shaft first driven rod 102 and the first driving shaft second driven rod 103, and the first driving shaft 101 drives the first driving shaft first driven rod 102 and the first driving shaft second driven rod 103 to rotate synchronously through a chain. The second driving shaft 201 is arranged on the bottom frame 9 in parallel with the second driving shaft second driven rod 203 and the second driving shaft third driven rod 204, and is located below the second driving shaft second driven rod 203 and the second driving shaft third driven rod 204. And the second driving shaft first driven rod 202 is arranged on the bottom frame 9 in parallel with the second driving shaft fourth driven rod 205 and the second driving shaft fifth driven rod 206, and is located below the second driving shaft fourth driven rod 205 and the second driving shaft fifth driven rod 206. The second driving shaft 201 drives the second driving shaft first driven rod 202, the second driving shaft second driven rod 203 and the second driving shaft third driven rod 204 to rotate synchronously through chains, and at the same time, the second driving shaft first driven rod 202 drives the second driving shaft fourth driven rod 205 and the second driving shaft fifth driven rod 206 to rotate synchronously with the second driving shaft first driven rod 202 through chains.

[0050] In some embodiments, the fully automatic screen stretching machine further comprises: a first motor 1 is arranged on the bottom frame 9, and the first motor 1 drives the second driving shaft first driven rod 202 to rotate through a chain. A second motor 2 is arranged on the bottom frame 9, and the second motor 2 drives the second driving shaft 201 to rotate through a chain. A third motor 3 is arranged on the bottom frame 9, and the third motor 3 drives the third driving shaft 301 to rotate through a chain, and the third driving shaft 301 drives the third driving shaft driven rod 302 to rotate synchronously with the third driving shaft 301 through a chain. And a fourth motor 4 is arranged on the bottom frame 9, and the fourth motor 4 drives the fourth driving shaft 401 to rotate through a chain, and the fourth driving shaft 401 drives the fourth driving shaft driven rod 402 to rotate synchronously with the fourth driving shaft 401 through a chain.

[0051] like Figure 8 As shown, Figure 8: is a cross-sectional schematic diagram of the third driving shaft according to an embodiment of the present invention. In this embodiment, the first driven rod 102 of the first driving shaft and the second driven rod 103 of the first driving shaft, the first driven rod 201 of the second driving shaft, the second driven rod 203 of the second driving shaft, the third driven rod 204 of the second driving shaft, the fourth driven rod 205 of the second driving shaft and the fifth driven rod 206 of the second driving shaft. The transmission structure and transmission principle of the third driving shaft 301 and the third driving shaft driven rod 302, and the fourth driving shaft 401 and the fourth driving shaft driven rod 402 are basically similar. Taking the third driving shaft 301 of this embodiment as an example, in general, the chain and sprocket 3011 drive the lead screw 3012 to rotate in the sleeve 3014, the sleeve 3014 is fixed on the bottom frame 9, and the lead screw 3012 is limited in axial movement by the bearing 3013 and the shoulder of the lead screw 3012. One section of the lead screw 3012 cooperates with the wire sleeve 3015. When the lead screw 3012 rotates, the wire sleeve 3015 moves on the lead screw 3012 because the axial movement of the lead screw 3012 is locked. The outer diameter of the wire sleeve 3015 matches the inner diameter of the sleeve 3014. Therefore, when the lead screw 3012 rotates, the wire sleeve 3015 is driven to move in the sleeve 3014. The other end of the wire sleeve 3015 is vertically connected to the clamping device, so the clamping device can translate with the rotation of the lead screw 3012. However, the present invention is not limited to this, and other mechanisms that can realize the conversion of rotation into linear movement can also be adopted.

[0052] See also Figures 1 to 8In some embodiments, the fully automatic screen stretching machine further comprises a plurality of transverse guide shafts 601 and a plurality of longitudinal guide shafts 602. The plurality of transverse guide shafts 601 are parallel to each other and are arranged on the upper plane of the bottom frame 9 perpendicularly to a pair of long sides of the upper plane of the bottom frame 9. One end of each transverse guide shaft 601 is inserted into a transverse guide sleeve arranged on the upper plane of the bottom frame 9, and the other end is vertically connected to one of the third clamping device 703, the fourth clamping device 704, the first auxiliary clamping device 705 and the second auxiliary clamping device 706. When the third clamping device 703, the fourth clamping device 704, the first auxiliary clamping device 705 and the second auxiliary clamping device 706 are translated, each transverse guide shaft 601 can slide in the transverse guide sleeve accordingly. Multiple longitudinal guide shafts 602 are parallel to each other and are arranged on the upper plane of the bottom frame 9 perpendicularly to a pair of short sides of the upper plane of the bottom frame 9, and are located near one end of the second clamping device 702. One end of each longitudinal guide shaft 602 is inserted into a longitudinal guide sleeve arranged on the upper plane of the bottom frame 9, and the other end is vertically connected to the second clamping device 702. When the second clamping device 702 is translated, each longitudinal guide shaft 602 can slide in the longitudinal guide sleeve with the second clamping device 702. Multiple transverse guide shafts 601 and multiple longitudinal guide shafts 602 can mainly play a supporting role for the clamping device to avoid the situation where the clamping device itself is too long and causes bending and deformation in the middle.

[0053] like Fig. 9As shown, in some embodiments, the fully automatic stretching machine further includes a platform assembly 8 disposed above the upper plane of the bottom frame 9, and the platform assembly 8 includes: a platform frame 801 disposed above the upper plane of the bottom frame 9, the platform frame 801 is a rectangular frame structure, a pair of short sides of the platform frame 801 are disposed parallel to the first clamping device 701 and the second clamping device 702, a pair of long sides of the platform frame 801 are disposed parallel to the third clamping device 703 and the fourth clamping device 704, and the positions correspond to the third clamping device 703 and the fourth clamping device 704. The first transverse guide shaft 8021, the second transverse guide shaft 8022, the third transverse guide shaft 8023 and the fourth transverse guide shaft 8024 are disposed on the lower plane of the platform frame 801 in parallel with each other and perpendicular to the pair of long sides of the platform frame 801. The first longitudinal guide shaft 8025 and the second longitudinal guide shaft 8026 are arranged on the lower plane of the platform frame 801 in parallel with each other and perpendicular to a pair of short sides of the platform frame 801, and are located at the short side of the platform frame 801 close to the second clamping device 702. The first transverse guide shaft 8021, the second transverse guide shaft 8022, the third transverse guide shaft 8023 and the fourth transverse guide shaft 8024, and the first longitudinal guide shaft 8025 and the second longitudinal guide shaft 8026 are each arranged on the lower plane of the platform frame 801 through at least two supporting shaft sleeves 802, and the first transverse guide shaft 8021, the second transverse guide shaft 8022, the third transverse guide shaft 8023 and the fourth transverse guide shaft 8024, and the first longitudinal guide shaft 8025 and the second longitudinal guide shaft 8026 are respectively able to slide on at least two supporting shaft sleeves 802. The first outer tie rod 805 is connected to one end of the first transverse guide shaft 8021 and the second transverse guide shaft 8022 at the same time, and the first outer tie rod 805 can be parallel to or away from one long side of the platform frame 801 through the guidance of the first transverse guide shaft 8021 and the second transverse guide shaft 8022. The second outer tie rod 806 is connected to one end of the third transverse guide shaft 8023 and the fourth transverse guide shaft 8024 at the same time, and the second outer tie rod 806 can be parallel to or away from the other long side of the platform frame 801 through the guidance of the third transverse guide shaft 8023 and the fourth transverse guide shaft 8024. The third outer tie rod 807 is connected to one end of the first longitudinal guide shaft 8025 and the second longitudinal guide shaft 8026 at the same time, and the third outer tie rod 807 can be parallel to or away from the short side of the platform frame 801 close to the second clamping device 702 through the guidance of the first longitudinal guide shaft 8025 and the second longitudinal guide shaft 8026. The platform cover plate 803 is laid flat on the upper plane of the platform frame 801. The electromagnet 804 is arranged on the side of the third outer rod 807 facing the second clamping device 702. And a plurality of connecting parts 808 are distributed on the lower plane of the platform frame 801. Among them, the upper planes of the first outer rod 805, the second outer rod 806 and the third outer rod 807 are flush with the platform cover plate 803.

[0054] In some embodiments, the platform assembly 8 is used to carry and lift the screen frame. When the screen stretching reaches the predetermined requirements, the platform assembly 8 lifts the screen frame upward after the screen stretching is completed. After the upper surface of the screen frame is attached to the screen, glue is applied to the screen along the plane of the screen frame to adhere the screen. The first outer pull rod 805, the second outer pull rod 806 and the third outer pull rod 807 can be appropriately pulled outward according to screen frames of different specifications to assist in lifting the screen frame more stably.

[0055] In some embodiments, the fully automatic stretching machine further includes a lifting device, which includes: a fifth motor 5 disposed on the bottom frame 9. The lifting device includes a transmission shaft assembly 501 consisting of a fifth driving shaft and a fifth driven shaft. The fifth driving shaft is disposed below the upper plane of the bottom frame 9, and the fifth motor 5 drives the fifth driving shaft to rotate through a chain. The fifth driven shaft is disposed below the upper plane of the bottom frame 9 in parallel with the fifth driven shaft, and the fifth driving shaft drives the fifth driven shaft to rotate synchronously with the fifth driving shaft through a chain. The eccentric wheel 502 is disposed at both ends of the fifth driving shaft and the fifth driven shaft. One end of the connecting rod 504 is pivotally connected to the edge of the eccentric wheel 502. One end of the platform support rod 503 passes through the lifting guide sleeve disposed on the bottom frame 9 and is fixedly connected to the connecting portion 808 of the platform frame 801, and the other end is pivotally connected to the other end of the connecting rod 504. Among them, while the fifth motor 5 drives the fifth driving shaft and the fifth driven shaft to rotate synchronously, the eccentric wheel 502 drives the platform support rod 503 to make vertical movement in the lifting guide sleeve through the connecting rod 504, thereby driving the platform assembly 8 to perform vertical lifting.

[0056] like Fig.11 See also Figures 1 to 8 In some embodiments, the first clamping device 701, the second clamping device 702, the third clamping device 703, the fourth clamping device 704, the first auxiliary clamping device 705 and the second auxiliary clamping device 706 all include a plurality of clamping heads, each clamping head includes a pneumatic locking device 710 (for example, but not limited to a cylinder), and the first clamping device 701, the second clamping device 702, the third clamping device 703, the fourth clamping device 704, the first auxiliary clamping device 705 and the second auxiliary clamping device 706 also include a fixed clamping head 708 and a pressing clamping head 709. The fixed clamping head 708 is arranged below the plurality of pneumatic locking devices 710. The pressing clamping head 709 is arranged between the plurality of pneumatic locking devices 710 and the fixed clamping head 708, and mutually matching pressing teeth are arranged on the relative planes of the pressing clamping head 709 and the fixed clamping head 708. Among them, the pneumatic locking devices 710 located at both ends of the first clamping device 701, the second clamping device 702, the third clamping device 703, the fourth clamping device 704, the first auxiliary clamping device 705 and the second auxiliary clamping device 706 are connected to the upper planes at both ends of the clamping clamp 709 through bolts.

[0057] like Figures 12 to 15 See also Figures 1 to 8 In some embodiments, the transmission of the fully automatic screen stretching machine of the present invention mainly relies on sprocket and chain transmission, which is driven by a motor. The chain transmission method is suitable for long-distance transmission, and has low cost and low requirements on the working environment while maintaining an accurate average transmission ratio. Other transmission forms can also be used, such as but not limited to toothed belts.

[0058] See also Figure 1 In some embodiments, the fully automatic screen stretching machine of the present invention further includes an electrical box 10, which can be arranged at any position around the bottom frame 9 for convenient operation and observation. The electrical box 10 controls the actions of each motor and receives information fed back by the sensor.

[0059] In some embodiments, the fully automatic mesh stretching machine of the present invention also includes each clamping device equipped with a distance sensor, which can transmit the displacement back to the controller (arranged in the electrical box 10) in real time, and is driven by a servo motor or an asynchronous motor, and cooperates with an encoder to realize the control of the displacement of the clamping device. Only the tensioning parameters need to be manually input, and the mesh stretching process is automatically controlled, so that fully automatic mesh stretching can be realized.

[0060] In some embodiments, the fully automatic screen stretching machine of the present invention is equipped with operating pedals around its periphery, and the operating pedals assist the gluing operation to avoid unreachable places during long-distance operations.

[0061] In some embodiments, the pneumatic locking devices 710 on both sides of the transverse long sides of the fully automatic screen stretching machine of the present invention also have an automatic corner release function. Compared with the pneumatic locking devices 710 in other positions, they have a delay function during the action process to prevent excessive tension in the corners from damaging the screen.

[0062] In some embodiments, the operation method of the fully automatic screen stretching machine of the present invention is as follows:

[0063] First, place the screen frame on the working platform (platform assembly 8), at which point the screen frame and the screen are not in contact;

[0064] The four sides of the wire mesh are extended into the clamping device (including the first clamping device 701, the second clamping device 702, the third clamping device 703, the fourth clamping device 704, the first auxiliary clamping device 705 and the second auxiliary clamping device 706), and the wire mesh is clamped by pressing down the jaws of the clamping device controlled by the cylinder.

[0065] According to the stretching parameters input into the controller of the electrical box 10 in advance, the four-side beams automatically move outward to stretch the screen. When the screen tension fed back by the distance sensor or the tension sensor reaches the required tension, the lifting device lifts the platform assembly 8 up, so that the screen frame is close to the screen and glue is applied, and the screen is pasted on the screen frame. After the glue is dry, the excess screen on the four sides is cut off, leaving the screen frame with tension and pasted on the frame, and the stretching process is completed. The entire stretching process is automatically controlled by the controller.

[0066] The operating method of the full-automatic screen stretching machine of the present invention also includes a large-area platform working mode and a small-area platform working mode.

[0067] Large area platform working method:

[0068] 1. After the wire mesh is inserted into the clamping device, all the jaws on the four sides are pressed down to fix the wire mesh;

[0069] 2. The first clamping device 701 is moved outwards through the third driving shaft 301 and the third driving shaft driven rod 302, and the second clamping device 702 is moved outwards through the fourth driving shaft 401 and the fourth driving shaft driven rod 402, thereby completing the Y-direction (longitudinal) stretching of the mesh;

[0070] 3. The third clamping device 703 is moved outwards through the screw drive of the third driven rod 204 of the second driving shaft and the fifth driven rod 206 of the second driving shaft, and the first auxiliary clamping device 705 is moved outwards through the screw drive of the first driven rod 102 of the first driving shaft, and the two move synchronously. The fourth clamping device 704 is moved outwards through the screw drive of the second driven rod 203 of the second driving shaft and the fourth driven rod 205 of the second driving shaft, and the second auxiliary clamping device 706 is moved outwards through the screw drive of the second driven rod 103 of the first driving shaft, and the two also move synchronously; through the above actions, the X-direction (lateral) stretching of the mesh is completed;

[0071] 4. When stretching a large screen frame, due to the limited platform area, the three outer edge square tubes of the platform frame 801 can be stretched outward through the support shaft at the bottom of the platform to support the screen frame;

[0072] 5. The magnet on the outer edge of the third outer pull rod 807 is used to assist in the attraction of the second clamping device 702. Because the length of the outer frame on this side is stretched out to be relatively long, the attraction can ensure stability.

[0073] Small area platform working mode:

[0074] 1. After the wire mesh is inserted into the clamping device, all the jaws on the four sides are pressed down to fix the wire mesh;

[0075] 2. The first clamping device 705 and the second clamping device 706 are withdrawn at the same time, and the second clamping device 702 is moved inwards close to the third outer pull rod 807 to reduce the working surface;

[0076] 3. The first clamping device 701 is moved outwards through the third driving shaft 301 and the third driving shaft driven rod 302, and the second clamping device 702 is moved outwards through the fourth driving shaft 401 and the fourth driving shaft driven rod 402, thereby completing the Y-direction (longitudinal) stretching of the mesh;

[0077] 3. The third clamping device 703 is moved outwards through the screw drive of the third driven rod 204 of the second driving shaft and the fifth driven rod 206 of the second driving shaft; the fourth clamping device 704 is moved outwards through the screw drive of the second driven rod 203 of the second driving shaft and the fourth driven rod 205 of the second driving shaft; the above actions complete the X-direction (lateral) stretching of the mesh;

[0078] After the screen is stretched, the platform assembly 8 is raised by the lifting device, and the screen frame on the platform assembly 8 is pressed against the screen.

[0079] In summary, the fully automatic screen stretching machine of the present invention has the following advantages:

[0080] 1. The horizontal long side tensioning device on each side is divided into two parts, with two ways of stretching the screen, which can be applied to various types of screens;

[0081] 2. Suitable for use with twill weave wire mesh, which can save more than 20% of the mesh usage;

[0082] 3. The combination of chain drive and screw drive reduces the equipment cost while ensuring the transmission ratio, and has low requirements on the working environment, which is suitable for long-distance transmission. At the same time, it has the advantages of accurate screw drive positioning and stable transmission;

[0083] 4. The platform lifting method adopts eccentric wheel transmission method, which reduces equipment cost and has stable transmission;

[0084] 5. The short side platform frame and tensioning device on one longitudinal side are equipped with electromagnets respectively, and the auxiliary platform moves toward the tensioning device on that side to expand the net stretching area and replace the manual dragging method;

[0085] 6. The tensioning device is equipped with a guide shaft to prevent the tensioning device from bending and deformation;

[0086] 7. Adopt linear clamping method to ensure the same amount of movement and reduce the quadrilateral variation of the screen when stretching the screen;

[0087] 8. The bottom of the platform is equipped with a support shaft to prevent the platform from deformation;

[0088] 9. The pneumatic locking on both sides of the transverse long side of the present invention has an automatic corner release function. Compared with the pneumatic locking at other positions, there is a delay in the action process to prevent the corner tension from being too large and damaging the screen.

[0089] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A fully automatic screen stretching machine, characterized in that: include: The bottom frame has a rectangular frame structure; A first clamping device and a second clamping device are arranged parallel to each other and symmetrically on the outer sides of a pair of short sides of the upper plane of the bottom frame; A third clamping device and a fourth clamping device are arranged parallel to each other and symmetrically on the outer sides of a pair of long sides of the upper plane of the bottom frame; A third driving shaft and a third driving shaft driven rod are arranged on a short side of the upper plane of the bottom frame in parallel with each other and perpendicular to the short side, the outer ends of the third driving shaft and the third driving shaft driven rod are vertically connected to the first clamping device, and the third driving shaft and the third driving shaft driven rod can jointly control the first clamping device to move away from or close to the short side of the bottom frame; A fourth driving shaft and a fourth driving shaft driven rod are arranged on another short side of the upper plane of the bottom frame in parallel with each other and perpendicular to the other short side, the outer ends of the fourth driving shaft and the fourth driving shaft driven rod are vertically connected to the second clamping device, and the fourth driving shaft and the fourth driving shaft driven rod can jointly control the second clamping device to move away from or close to the other short side of the bottom frame; The second driven rod of the second driving shaft and the fourth driven rod of the second driving shaft are arranged on a long side of the upper plane of the bottom frame in parallel with each other and perpendicular to the long side of the bottom frame, the outer ends of the second driven rod of the second driving shaft and the fourth driven rod of the second driving shaft are vertically connected to the fourth clamping device, and the second driven rod of the second driving shaft and the fourth driven rod of the second driving shaft can jointly control the fourth clamping device to move away from or close to the long side of the bottom frame; as well as The third driven rod of the second driving shaft and the fifth driven rod of the second driving shaft are parallel to each other and perpendicular to the other long side of the upper plane of the bottom frame and are arranged on the other long side. The outer ends of the third driven rod of the second driving shaft and the fifth driven rod of the second driving shaft are vertically connected to the third clamping device. The third driven rod of the second driving shaft and the fifth driven rod of the second driving shaft can jointly control the third clamping device to move away from or close to the other long side of the bottom frame. The fully automatic screen stretching machine also includes: A first auxiliary clamping device and a second auxiliary clamping device are arranged parallel to each other and symmetrically on the outer sides of the pair of long sides of the upper plane of the bottom frame and are located on one side close to the other short side of the upper plane of the bottom frame; A first driven rod of a first driving shaft is arranged on one long side of the upper plane of the bottom frame perpendicularly to the one long side and located on one side close to the other short side of the upper plane of the bottom frame, and an outer side of the first driven rod of the first driving shaft is vertically connected to the first auxiliary clamping device; A first driving shaft and a second driven rod are arranged on the other long side of the upper plane of the bottom frame in a manner perpendicular to the other long side and located on one side close to the other short side of the bottom frame, and the outer side of the second driven rod of the first driving shaft is vertically connected to the second auxiliary clamping device; The first driven rod of the first driving shaft can control the first auxiliary clamping device to be away from or close to the one long side of the upper plane of the bottom frame, and the second driven rod of the first driving shaft can control the second auxiliary clamping device to be away from or close to the other long side of the upper plane of the bottom frame; A first driving shaft is arranged on the bottom frame in parallel with the first driven rod of the first driving shaft and the second driven rod of the first driving shaft, and is located below the first driven rod of the first driving shaft and the second driven rod of the first driving shaft, and the first driving shaft drives the first driven rod of the first driving shaft and the second driven rod of the first driving shaft to rotate synchronously through chains respectively; A second driving shaft, which is arranged on the bottom frame in parallel with the second driving shaft second driven rod and the second driving shaft third driven rod, and is located below the second driving shaft second driven rod and the second driving shaft third driven rod; and a second driving shaft first driven rod, which is arranged on the bottom frame in parallel with the second driving shaft fourth driven rod and the second driving shaft fifth driven rod, and is located below the second driving shaft fourth driven rod and the second driving shaft fifth driven rod; and The second driving shaft drives the first driven rod of the second driving shaft, the second driven rod of the second driving shaft and the third driven rod of the second driving shaft to rotate synchronously through chains, and the first driven rod of the second driving shaft drives the fourth driven rod of the second driving shaft and the fifth driven rod of the second driving shaft to rotate synchronously with the first driven rod of the second driving shaft through chains; The fully automatic screen stretching machine further comprises a platform assembly, which is arranged above the upper plane of the bottom frame, and the platform assembly comprises: A platform frame, which is arranged above the upper plane of the bottom frame, and the platform frame is a rectangular frame structure, a pair of short sides of the platform frame are arranged in parallel with the first clamping device and the second clamping device, and a pair of long sides of the platform frame are arranged in parallel with the third clamping device and the fourth clamping device, and the positions are corresponding to the third clamping device and the fourth clamping device; A first transverse guide shaft, a second transverse guide shaft, a third transverse guide shaft and a fourth transverse guide shaft are arranged on the lower plane of the platform frame in parallel with each other and perpendicular to a pair of long sides of the platform frame; A first longitudinal guide shaft and a second longitudinal guide shaft, which are arranged on the lower plane of the platform frame in parallel with each other and perpendicular to a pair of short sides of the platform frame, and are located at the short side of the platform frame close to the second clamping device; A plurality of supporting sleeves, wherein the first transverse guide shaft, the second transverse guide shaft, the third transverse guide shaft and the fourth transverse guide shaft, and the first longitudinal guide shaft and the second longitudinal guide shaft are each arranged on the lower plane of the platform frame through at least two of the supporting sleeves, and the first transverse guide shaft, the second transverse guide shaft, the third transverse guide shaft and the fourth transverse guide shaft, and the first longitudinal guide shaft and the second longitudinal guide shaft are respectively able to slide on the at least two supporting sleeves; a first outer tie rod, which is connected to one end of the first transverse guide shaft and the second transverse guide shaft at the same time, and the first outer tie rod can approach or move away from a long side of the platform frame in parallel through the guidance of the first transverse guide shaft and the second transverse guide shaft; a second outer tie rod, which is connected to one end of the third transverse guide shaft and the fourth transverse guide shaft at the same time, and the second outer tie rod can be parallel to or away from the other long side of the platform frame through the guidance of the third transverse guide shaft and the fourth transverse guide shaft; a third outer tie rod, which is connected to one end of the first longitudinal guide shaft and the second longitudinal guide shaft at the same time, and the third outer tie rod can be parallelly approached to or away from the short side of the platform frame close to the second clamping device through the guidance of the first longitudinal guide shaft and the second longitudinal guide shaft; A platform cover plate, which is laid flat on the upper plane of the platform frame; an electromagnet, which is arranged on a side of the third outer pull rod facing the second clamping device; and A plurality of connecting parts distributed on the lower plane of the platform frame; Wherein, upper planes of the first outer tie rod, the second outer tie rod and the third outer tie rod are flush with the platform cover plate.

2. The fully automatic screen stretching machine according to claim 1, characterized in that: The action of the third clamping device moving away from or approaching the one long side of the bottom frame and the action of the fourth clamping device moving away from or approaching the other long side of the bottom frame are synchronous actions.

3. The fully automatic screen stretching machine according to claim 1, characterized in that: The action of the first auxiliary clamping device moving away from or approaching the one long side of the upper plane of the bottom frame and the action of the second auxiliary clamping device moving away from or approaching the other long side of the upper plane of the bottom frame are synchronous actions.

4. The fully automatic screen stretching machine according to claim 1, characterized in that: Also includes: A first motor, which is arranged on the bottom frame, and the first motor drives a first driving shaft through a chain; A second motor is arranged on the bottom frame, and the second motor drives the second driving shaft to rotate through a chain; A third motor is arranged on the bottom frame, the third motor drives the third driving shaft to rotate through a chain, and the third driving shaft drives the third driving shaft driven rod to rotate synchronously with the third driving shaft through a chain; as well as A fourth motor is arranged on the bottom frame, and the fourth motor drives the fourth driving shaft to rotate through a chain. Meanwhile, the fourth driving shaft drives the fourth driving shaft driven rod through a chain to rotate synchronously with the fourth driving shaft.

5. The fully automatic screen stretching machine according to claim 1, characterized in that: Also included is a lifting device, comprising: a fifth motor, which is disposed on the bottom frame; A transmission shaft assembly comprising: A fifth driving shaft is arranged below the upper plane of the bottom frame, and the fifth motor drives the fifth driving shaft to rotate through a chain; and A fifth driven shaft, which is arranged below the upper plane of the bottom frame in parallel with the fifth driven shaft, and the fifth driving shaft drives the fifth driven shaft to rotate synchronously with the fifth driving shaft through a chain; an eccentric wheel, which is arranged at both ends of the fifth driving shaft and the fifth driven shaft; A connecting rod, one end of which is pivotally connected to the edge of the eccentric wheel; A platform support rod, one end of which passes through a lifting guide sleeve arranged on the bottom frame and is fixedly connected to the connecting portion of the platform frame, and the other end of which is pivotally connected to the other end of the linkage rod; Among them, while the fifth motor drives the fifth driving shaft and the fifth driven shaft to rotate synchronously, the eccentric wheel drives the platform support rod to move vertically in the lifting guide sleeve through the connecting rod, thereby driving the platform assembly to perform vertical lifting.

6. The fully automatic screen stretching machine according to claim 1, characterized in that: Also includes: A plurality of transverse guide shafts, which are parallel to each other and arranged on the upper plane of the bottom frame perpendicularly to a pair of long sides of the upper plane of the bottom frame, one end of each of the transverse guide shafts is inserted into a transverse guide sleeve arranged on the upper plane of the bottom frame, and the other end is vertically connected to one of the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device, and when the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device are translated, each of the transverse guide shafts can slide in the transverse guide sleeve accordingly; as well as A plurality of longitudinal guide shafts are arranged on the upper plane of the bottom frame in parallel with each other and perpendicular to a pair of short sides of the upper plane of the bottom frame, and are located at one end close to the second clamping device. One end of each of the longitudinal guide shafts is inserted into a longitudinal guide sleeve arranged on the upper plane of the bottom frame, and the other end is vertically connected to the second clamping device. When the second clamping device is translated, each of the longitudinal guide shafts can slide in the longitudinal guide sleeve with the second clamping device.

7. The fully automatic screen stretching machine according to claim 1, characterized in that: The first clamping device, the second clamping device, the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device each include a plurality of clamping heads, each of the clamping heads includes a pneumatic locking device, and the first clamping device, the second clamping device, the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device also include: a fixing chuck disposed below the plurality of pneumatic locking devices; and A clamping chuck is arranged between the plurality of pneumatic locking devices and the fixed chuck, and mutually matching clamping teeth are arranged on the relative planes of the clamping chuck and the fixed chuck; Wherein, the pneumatic locking devices located at both ends of the first clamping device, the second clamping device, the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device are connected to the upper planes at both ends of the clamping chuck through bolts.

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