A fully automatic biaxially stretched sheet preheating machine

Abstract

The present invention belongs to the field of sheet processing equipment, and in particular, relates to a fully automatic biaxially stretched sheet preheating machine, comprising a chassis, a cabinet door is provided on the front side of the chassis, a feed port and a discharge port are provided on the left and right sides of the chassis respectively, a partition is provided inside the chassis, a square frame is provided at the bottom of the chassis, and four guide columns are provided on the square frame; an upper movable rack, the number of which is two; a lower movable rack, the number of which is two; a plurality of downwardly arranged rolling members are provided equally between the two upper movable racks, a plurality of upwardly arranged rolling members are provided between the two lower movable racks, and the rolling members on the upper movable rack and the rolling members on the lower movable rack are staggered in the horizontal direction; a driving member, the driving member can drive the upper movable rack and the lower movable rack to move. The upper movable rack and the lower movable rack are moved so that the rolling members on the two are staggered in the horizontal line, and then the sheet is fed from the feed port, and the sheet can be separated from the upper movable rack to realize biaxial automatic pulling of the sheet.

Description

Technical Field

[0001] The invention belongs to the field of sheet material processing equipment, and in particular relates to a fully automatic biaxially stretched sheet material preheating machine. Background Art

[0002] At present, sheet preheating machines are often used in the process of sheet stretching. Most sheet preheating machines heat the sheet by winding the sheet through a roller, stretching it, and then heating it with a fan. The process of winding the sheet through the roller is mostly done manually. The temperature inside the sheet preheating box is high. Manual sheet feeding is not only inefficient, but also has the possibility of harming the operator. For example, the patent with application number 202322268954.8, entitled A Low-temperature Preheating Sheet Oven, provides a sheet preheating oven that requires manual sheet feeding before it can work.

[0003] After research and summary, the sheet preheating machines at home and abroad have problems such as troublesome sheet threading and sheet waste. Therefore, the present application aims to propose a fully automatic biaxially stretched sheet preheating machine to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems in the existing technology and to propose a fully automatic biaxially stretched sheet preheating machine. The present invention moves the upper movable frame and the lower movable frame so that the rolling parts on the two are staggered on the horizontal line. Then, the sheet is fed into the feed port and the upper movable frame and the lower movable frame are separated to realize automatic biaxial stretching of the sheet.

[0005] The object of the present invention can be achieved by the following technical scheme: A fully automatic biaxially stretched sheet preheating machine, comprising a machine box, a machine box door is provided on the front side of the machine box, a feed port and a discharge port are provided on the left and right sides of the machine box respectively, a partition is provided inside the machine box, a square frame is provided at the bottom of the machine box, and four guide columns are provided on the square frame;

[0006] An upper moving frame, wherein the number of the upper moving frames is two, the upper moving frame on the front side is slidably connected to the two guide posts on the front side through a first sliding sleeve, and the upper moving frame on the rear side is slidably connected to the two guide posts on the rear side through a first sliding sleeve;

[0007] A lower moving frame, wherein the number of the lower moving frames is two, the lower moving frame on the front side is slidably connected to the two guide posts on the front side through a first sliding sleeve, and the lower moving frame on the rear side is slidably connected to the two guide posts on the rear side through a first sliding sleeve;

[0008] A plurality of rolling members arranged downward are arranged at equal intervals between the two upper moving frames, a plurality of rolling members arranged upward are arranged between the two lower moving frames, and the rolling members on the upper moving frames and the rolling members on the lower moving frames are staggered in the horizontal direction;

[0009] A driving member is provided, wherein the driving member can drive the upper moving frame and the lower moving frame to move.

[0010] The driving member can also drive the upper moving frame and the lower moving frame to move by driving methods such as a cylinder, a chain, a gear rack, etc.

[0011] A first conveying roller is rotatably arranged at the lower side of the feed port of the chassis, a first cylinder is fixedly arranged above the first conveying roller, a first U-shaped frame is arranged at the output end of the first cylinder, a first clamping roller is rotatably arranged in the first U-shaped frame, a second conveying roller is rotatably arranged at the right side of the feed port of the chassis, and a third conveying roller and a fourth conveying roller are rotatably arranged on both sides of the discharge port of the chassis.

[0012] The driving member includes four positive and negative thread lifting ball screws rotatably arranged on a square frame, the positive and negative thread lifting ball screws extend through the partition and the top of the chassis, and a driving sprocket is fixedly arranged at one end of each positive and negative thread lifting ball screw extending out of the chassis, one of the driving sprockets is connected to the output end of the first reduction motor, and a plurality of tensioning wheels are also rotatably arranged on the top of the chassis, and the plurality of driving sprockets are connected to the tensioning wheels through chain transmission, and the upper movable frame, the lower movable frame and the positive and negative thread lifting ball screws are connected through thread sleeve transmission.

[0013] A sheet feeding roller is rotatably arranged on one side of the square frame close to the discharge port, a second reduction motor is arranged on the side wall of the chassis, an output end of the second reduction motor is fixedly connected to the sheet feeding roller, a second cylinder is fixedly arranged on the top of the chassis, an output end of the second cylinder passes through the upper wall and partition of the chassis, a second U-shaped frame is connected to the output end of the second cylinder, and a second clamping roller is rotatably arranged in the second U-shaped frame.

[0014] Fixed tubes are fixedly arranged on both sides of the bottom of one side of the square frame facing the discharge port, and the two fixed tubes extend upward through the partition and the upper wall of the chassis; a second sliding sleeve is slidably arranged on each of the fixed tubes, a connecting head is fixedly arranged on each of the second sliding sleeves, a sensing rod is connected between the two connecting heads, and a limit block is fixedly arranged in the middle of each of the fixed tubes; a detection rod is slidably arranged in one of the fixed tubes, a limiting plate is connected to the upper end of the detection rod, a first spring is connected between the limiting plate and the fixed tube, a U-shaped groove is opened on the lower side of the fixed tube, a limiting screw is fixedly arranged at the bottom of the detection rod, and the limiting screw extends out of the U-shaped groove toward one end of the sensing rod.

[0015] A heating orifice plate is arranged inside the chassis, and the heating orifice plate and the partition separate a heating chamber from the chassis. A ventilation hood is arranged in the heating chamber, and an air inlet connected to the ventilation hood is opened on the upper wall of the chassis.

[0016] The rolling element comprises two first fixing plates for fixing to the upper moving frame or the lower moving frame, and a first pull-tab roller is rotatably connected between the two first fixing plates.

[0017] The rolling member includes two second fixed plates for fixing to the upper movable frame or the lower movable frame, each of the second fixed plates is fixedly connected to the double-headed hydraulic cylinder through the fixed frame, a large hydraulic chamber and a small hydraulic chamber are arranged in the double-headed hydraulic cylinder, the large hydraulic chamber and the small hydraulic chamber are connected through a flow limiting hole, a first hydraulic column is provided with a sliding seal in the large hydraulic chamber, a second spring is connected between the first hydraulic column and the bottom wall of the large hydraulic chamber, a section of the first hydraulic column extending out of the large hydraulic chamber is fixedly connected to an L-shaped connecting plate, and a second pull-tab roller is rotatably connected between the two L-shaped connecting plates; a second hydraulic column is provided with a sliding seal in the small hydraulic chamber, each of the second hydraulic columns extends out of the small hydraulic chamber and is fixedly connected to a strip-shaped connecting member, a side of the strip connecting member facing the second pull-tab roller is fixedly connected to an elastic telescopic rod, an output end of the elastic telescopic rod is fixedly connected to a sheet-shaped connecting plate, and a clamping roller is rotatably connected between the two sheet-shaped connecting plates.

[0018] The chassis is also provided with a control panel.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The design of the upper and lower moving frames realizes the bidirectional automatic stretching of the sheet, and avoids manual sheet feeding, realizing automatic sheet feeding.

[0021] 2. The detection element that contacts the film is set outside the chassis to avoid failure of the detection element caused by high temperature, ensure that the equipment can work stably for a long time, and avoid failure of the detection element that occurs during the use of traditional equipment.

[0022] 3. Limit the end of the sheet stretching preheating to avoid the sheet shaking when the sheet preheating reaches the final stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a stereogram of the present invention;

[0024] Figure 2 It is the front view of the present invention;

[0025] Figure 3 It is a side view of the present invention;

[0026] Figure 4 A top view of the present invention;

[0027] Figure 5 for Figure 4 Sectional view at AA;

[0028] Figure 6 This is a schematic diagram of the internal structure of Embodiment 1 of the present invention;

[0029] Figure 7 for Figure 6 A partial enlarged view of point C in the middle;

[0030] Figure 8 for Figure 4 Sectional view at the middle BB;

[0031] Fig. 9 for Figure 8 A partial enlarged view of point D in the middle;

[0032] Fig.10 is a three-dimensional diagram of a rolling element in the second embodiment of the present invention;

[0033] Fig.11 for Fig.10 The front view of the structure shown;

[0034] Fig.12 for Fig.10 A top view of the structure shown;

[0035] Fig.13 for Fig.12 Isometric section view at EE in the middle;

[0036] Fig.14 for Fig.13 A partial enlarged view of point F in the middle;

[0037] Fig.15 This is a schematic diagram of the retracted state of the rolling element in the second embodiment.

[0038] In the figure: chassis 1, fourth conveyor roller 2, first reduction motor 3, tension wheel 4, drive sprocket 5, control panel 6, box door 7, first conveyor roller 8, first clamping roller 9, first U-shaped frame 10, second cylinder 11, second conveyor roller 12, square frame 13, lower movable frame 14, first fixed plate 15, upper movable frame 16, air inlet 17, ventilation hood 18, positive and negative tooth lifting ball screw 19, guide column 20, third conveyor roller 21, heating orifice plate 22, partition 23, fixed pipe 24, first sliding sleeve 25, first pull-tab roller 26, limit block 27, second reduction motor 28 , the sheet feeding roller 29, the second clamping roller 30, the second U-shaped frame 31, the detection rod 32, the limit plate 33, the first spring 34, the connecting head 35, the second sliding sleeve 36, the sensing rod 37, the U-shaped groove 38, the limit screw 39, the second fixed plate 40, the fixed frame 41, the double-headed hydraulic cylinder 42, the second hydraulic column 43, the strip connecting piece 44, the elastic telescopic rod 45, the sheet connecting plate 46, the first hydraulic column 47, the L-shaped connecting plate 48, the clamping roller 49, the second pull-tab roller 50, the small hydraulic cavity 51, the second spring 52, the large hydraulic cavity 53, the flow limiting hole 54, and the first cylinder 55. Detailed implementation manners

[0039] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0040] It should be noted here that the upper and lower orientation words involved in this article are defined based on Figures 1 to 15 the positions of the components in the figure and the positions of the components relative to each other, only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the orientation words adopted in this article should not limit the scope of protection claimed in this application.

[0041] Embodiment 1:

[0042] Combined with the attached Figure 1-9 , a fully automatic bidirectional stretching sheet preheating machine includes a chassis 1. A box door 7 is provided on the front side of the chassis 1. Feed inlets and discharge outlets are respectively provided on the left and right sides of the chassis 1. A partition 23 is provided inside the chassis 1. A square frame 13 is provided at the bottom of the chassis 1. Four guide posts 20 are provided on the square frame 13;

[0043] Upper moving frames 16, and the number of the upper moving frames 16 is two. The front upper moving frame 16 is slidably connected to the two front guide posts 20 through a first sliding sleeve 25. The rear upper moving frame 16 is slidably connected to the two rear guide posts 20 through a first sliding sleeve 25;

[0044] Lower moving frames 14, and the number of the lower moving frames 14 is two. The front lower moving frame 14 is slidably connected to the two front guide posts 20 through a first sliding sleeve 25. The rear lower moving frame 14 is slidably connected to the two rear guide posts 20 through a first sliding sleeve 25;

[0045] A plurality of downwardly arranged rolling members are equidistantly provided between the two upper moving frames 16. A plurality of upwardly arranged rolling members are provided between the two lower moving frames 14. The rolling members on the upper moving frames 16 and the rolling members on the lower moving frames 14 are staggered in the horizontal direction;

[0046] A driving member, and the driving member can drive the upper moving frames 16 and the lower moving frames 14 to move.

[0047] A first conveying roller 8 is rotatably provided below the feed inlet of the chassis 1. A first air cylinder 55 is fixedly provided above the first conveying roller 8. A first U-shaped frame 10 is provided at the output end of the first air cylinder 55. A first pressing roller 9 is rotatably provided inside the first U-shaped frame 10. A second conveying roller 12 is rotatably provided on the right side of the feed inlet of the chassis 1. A third conveying roller 21 and a fourth conveying roller 2 are respectively rotatably provided on both sides of the discharge outlet of the chassis 1.

[0048] The driving part includes four positive and negative thread lifting ball screws 19 rotatably arranged on the square frame 13, and the positive and negative thread lifting ball screws 19 extend through the partition 23 and the top of the chassis 1. A driving sprocket 5 is fixedly arranged at one end of each positive and negative thread lifting ball screw 19 extending out of the chassis 1, and one of the driving sprockets 5 is connected to the output end of the first reduction motor 3. A plurality of tensioning wheels 4 are also rotatably arranged on the top of the chassis 1, and the plurality of driving sprockets 5 are connected to the tensioning wheels through chain transmission. The upper movable frame 16, the lower movable frame 14 and the positive and negative thread lifting ball screws 19 are connected to each other through a thread sleeve transmission.

[0049] A sheet feeding roller 29 is rotatably provided on one side of the square frame 13 near the discharge port, a second reduction motor 28 is provided on the side wall of the chassis 1, the output end of the second reduction motor 28 is fixedly connected to the sheet feeding roller 29, a second cylinder 11 is fixedly provided on the top of the chassis 1, the output end of the second cylinder 11 passes through the upper wall of the chassis 1 and the partition 23, the output end of the second cylinder 11 is connected to a second U-shaped frame 31, and a second clamping roller 30 is rotatably provided inside the second U-shaped frame 31.

[0050] The square frame 13 is fixedly provided with fixed tubes 24 on both sides of the bottom of one side facing the discharge port, and the two fixed tubes 24 extend upward through the partition 23 and the upper wall of the chassis 1; a second sliding sleeve 36 is slidably provided on each fixed tube 24, a connector 35 is fixedly provided on each second sliding sleeve 36, a sensing rod 37 is connected between the two connectors 35, and a limit block 27 is fixedly provided in the middle of each fixed tube 24; a detection rod 32 is slidably provided in one of the fixed tubes 24, a limit plate 33 is connected to the upper end of the detection rod 32, a first spring 34 is connected between the limit plate 33 and the fixed tube 24, a U-shaped groove 38 is provided on the lower side of the fixed tube 24, and a limit screw 39 is fixedly provided at the bottom of the detection rod 32, and the limit screw 39 extends out of the U-shaped groove 38 toward one end of the sensing rod 37. A photoelectric sensor is provided on the top of the chassis 1 to detect the position of the limit plate 33. When the limit plate 33 moves down and leaves the detection range, the second reduction motor 28 is stopped, thereby stopping the feeding of the sheet to avoid wasting energy.

[0051] A heating orifice plate 22 is provided inside the chassis 1, and the heating orifice plate 22 and the partition plate 23 separate a heating chamber from the chassis 1. A ventilation hood 18 is provided in the heating chamber, and an air inlet 17 connected to the ventilation hood 18 is provided on the upper wall of the chassis 1. The air inlet is connected to an external air supply system, which will not be described in detail here.

[0052] The rolling member includes two first fixing plates 15 for fixing to the upper moving frame 16 or the lower moving frame 14 , and a first pull-tab roller 26 is rotatably connected between the two first fixing plates 15 .

[0053] The chassis 1 is also provided with a control panel 6. The control panel 6 can control the operation of the first reduction motor 3, the second reduction motor 28, the first cylinder 55, and the second cylinder 11.

[0054] During specific operation, the driving sprocket 5 is driven to rotate by the first reduction motor 3, thereby driving the remaining driving sprockets 5 to rotate through the chain, thereby driving the four positive and negative tooth lifting ball screws 19 to rotate, thereby driving the two upper moving frames 16 to move downward through the thread sleeve, and the two lower moving frames 14 to move upward, so that the first pull-tab roller 26 on the lower moving frame 14 is located on the upper side of the first pull-tab roller 26 on the upper moving frame 16, pulling up the sensing rod 37.

[0055] The sheet is fed in from the feed port, passes through the gap between the upper movable frame 16 and the first pull-tab roller 26 on the lower movable frame 14, and passes out from the discharge port. The sensing rod 37 is lowered, and then the first cylinder 55 and the second cylinder 11 are controlled to start, and the first pressing roller 9 and the second pressing roller 30 are pressed down to press the sheet. The air supply system is started to preheat the sheet, and then the first reduction motor 3 is started to drive the upper movable frame 16 to move up and the lower movable frame 14 to move down. The first pull-tab roller 26 on the upper movable frame 16 and the lower movable frame 14 stretch the sheet in an interlaced manner, and the second reduction motor 28 is started to start feeding the sheet, and the stretched and preheated sheet is sent out from the discharge port.

[0056] When the sheet leaves the sensing rod 37, the sensing rod 37 loses its limit and moves downward, driving the second sliding sleeve 36 to move, thereby driving the limit screw 39 to move downward, pulling the detection rod 32 to move downward, thereby driving the limit plate 33 to move downward, the photoelectric sensor loses the signal, and the second reduction motor 28 is turned off. The detection element contacted by the sheet feeding is arranged outside the chassis 1 to avoid failure of the detection element caused by high temperature.

[0057] Embodiment 2:

[0058] Combined with Figure 10-15On the basis of the first embodiment, the rolling element includes two second fixing plates 40 for fixing to the upper moving frame 16 or the lower moving frame 14, each second fixing plate 40 is fixedly connected to the double-headed hydraulic cylinder 42 through the fixing frame 41, and a large hydraulic chamber 53 and a small hydraulic chamber 51 are arranged in the double-headed hydraulic cylinder 42, and the large hydraulic chamber 53 and the small hydraulic chamber 51 are communicated through the flow limiting hole 54, and a first hydraulic column 47 is provided in the large hydraulic chamber 53 for sliding sealing, and a second spring 52 is connected between the first hydraulic column 47 and the bottom wall of the large hydraulic chamber 53, and the first hydraulic column 47 extends out A section of the large hydraulic chamber 53 is fixedly connected to an L-shaped connecting plate 48, and the two L-shaped connecting plates 48 are rotatably connected to the second pull-tab roller 50; a second hydraulic column 43 is provided in a sliding seal in the small hydraulic chamber 51, and each second hydraulic column 43 extends out of a section of the small hydraulic chamber 51 and is fixedly connected to a strip-shaped connecting member 44, and the strip-shaped connecting member 44 is fixedly connected to a side facing the second pull-tab roller 50 with an elastic telescopic rod 45, and the output end of the elastic telescopic rod 45 is fixedly connected to a sheet-shaped connecting plate 46, and a pressing roller 49 is rotatably connected between the two sheet-shaped connecting plates 46. The cross section of the large hydraulic chamber 53 is larger than that of the small hydraulic chamber 51, so that the descending speed of the second hydraulic column 43 is faster than that of the first hydraulic column 47.

[0059] In this embodiment, when the upper movable frame 16 and the lower movable frame 14 are close to and staggered, the second pull-tab roller 50 is not subjected to the tensile force, and the clamping roller 49 is away from the second pull-tab roller 50. After the sheet feeding is completed, the upper movable frame 16 and the lower movable frame 14 are separated and begin to stretch. At this time, the second pull-tab roller 50 is subjected to the tensile force of the sheet, driving the first hydraulic column 47 to slide out of the large hydraulic chamber 53, and gradually extracting the hydraulic fluid in the small hydraulic chamber 51 through the flow limiting hole 54, driving the second hydraulic column 43 to enter the small hydraulic chamber 51, thereby driving the clamping roller 49 to move toward the second pull-tab roller 50 until the clamping roller 49 and the second pull-tab roller 50 clamp the sheet for transportation.

[0060] When the sheet is about to be stretched to the end, the second pull-tab roller 50 closest to the feed port loses the pulling force caused by the sheet first. Due to the setting of the limiting hole 54, under the action of the second spring 52, the first hydraulic column 47 slowly moves back into the large hydraulic chamber 53. Due to the elastic force of the elastic telescopic rod 45, before the sheet is separated from the second pull-tab roller 50, the second pull-tab roller 50 and the clamping roller 49 still keep the sheet limited, thereby preventing the sheet from losing the limit and shaking in the chassis 1 when it is processed to the end, ensuring good stretching preheating work at the end of the sheet, and avoiding sheet waste.

[0061] The above is only a preferred implementation of the present application. Although the present application has been disclosed as a preferred embodiment, it is not intended to limit the present application. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the scope of protection of the technical solution of the present application.

Claims

1. A fully automatic biaxially stretched sheet preheating machine, comprising a machine box (1), a machine box door (7) is provided on the front side of the machine box (1), and a feed port and a discharge port are provided on the left and right sides of the machine box (1), characterized in that: A partition (23) is provided inside the chassis (1), a square frame (13) is provided at the bottom of the chassis (1), and four guide columns (20) are provided on the square frame (13); An upper movable frame (16), wherein the number of the upper movable frames (16) is two, the upper movable frame (16) on the front side is slidably connected to the two guide columns (20) on the front side via a first sliding sleeve (25), and the upper movable frame (16) on the rear side is slidably connected to the two guide columns (20) on the rear side via a first sliding sleeve (25); A lower moving frame (14), wherein the number of the lower moving frames (14) is two, the lower moving frame (14) on the front side is slidably connected to the two guide columns (20) on the front side via a first sliding sleeve (25), and the lower moving frame (14) on the rear side is slidably connected to the two guide columns (20) on the rear side via the first sliding sleeve (25); A plurality of rolling elements arranged downward are arranged at equal intervals between the two upper moving frames (16), and a plurality of rolling elements arranged upward are arranged between the two lower moving frames (14), and the rolling elements on the upper moving frames (16) and the rolling elements on the lower moving frames (14) are staggered in the horizontal direction; A driving member, wherein the driving member is capable of driving the upper movable frame (16) and the lower movable frame (14) to move; The rolling element comprises two second fixing plates (40) for fixing to the upper moving frame (16) or the lower moving frame (14), each of the second fixing plates (40) being fixedly connected to a double-headed hydraulic cylinder (42) via a fixing frame (41), a large hydraulic chamber (53) and a small hydraulic chamber (51) being provided in the double-headed hydraulic cylinder (42), the large hydraulic chamber (53) and the small hydraulic chamber (51) being connected via a flow limiting hole (54), a first hydraulic column (47) being provided in a sliding seal in the large hydraulic chamber (53), a second spring (52) being connected between the first hydraulic column (47) and the bottom wall of the large hydraulic chamber (53), the first hydraulic column (47) extending out of the large hydraulic chamber (53) A section of the pressure chamber (53) is fixedly connected to an L-shaped connecting plate (48), and the second pull-tab roller (50) is rotatably connected between the two L-shaped connecting plates (48); a second hydraulic column (43) is slidingly sealed in the small hydraulic chamber (51), and each of the second hydraulic columns (43) extends out of the small hydraulic chamber (51) and is fixedly connected to a strip-shaped connecting member (44), and the strip-shaped connecting member (44) is fixedly connected to a side of the second pull-tab roller (50) with an elastic telescopic rod (45), and the output end of the elastic telescopic rod (45) is fixedly connected to a sheet-shaped connecting plate (46), and a clamping roller (49) is rotatably connected between the two sheet-shaped connecting plates (46).

2. A fully automatic biaxially stretched sheet preheating machine according to claim 1, characterized in that: A first conveying roller (8) is rotatably arranged at the lower side of the feed inlet of the chassis (1), a first cylinder (55) is fixedly arranged above the first conveying roller (8), a first U-shaped frame (10) is arranged at the output end of the first cylinder (55), a first pressing roller (9) is rotatably arranged inside the first U-shaped frame (10), a second conveying roller (12) is rotatably arranged at the right side of the feed inlet of the chassis (1), and a third conveying roller (21) and a fourth conveying roller (2) are rotatably arranged on both sides of the discharge port of the chassis (1).

3. The fully automatic biaxially stretched sheet preheating machine according to claim 1, characterized in that: The driving member comprises four positive and negative thread lifting ball screws (19) rotatably arranged on a square frame (13), the positive and negative thread lifting ball screws (19) extending through a partition (23) and the top of a chassis (1), a driving sprocket (5) is fixedly arranged at one end of each positive and negative thread lifting ball screw (19) extending out of the chassis (1), one of the driving sprockets (5) being connected to the output end of a first reduction motor (3), a plurality of tensioning wheels (4) being rotatably arranged on the top of the chassis (1), the plurality of driving sprockets (5) being connected to the tensioning wheels via a chain transmission, and the upper movable frame (16), the lower movable frame (14) and the positive and negative thread lifting ball screws (19) being connected via a thread sleeve transmission.

4. The fully automatic biaxially stretched sheet preheating machine according to claim 1, characterized in that: A sheet feeding roller (29) is rotatably arranged on one side of the square frame (13) close to the discharge port, a second reduction motor (28) is arranged on the side wall of the chassis (1), the output end of the second reduction motor (28) is fixedly connected to the sheet feeding roller (29), a second cylinder (11) is fixedly arranged on the top of the chassis (1), the output end of the second cylinder (11) passes through the upper wall of the chassis (1) and the partition (23), the output end of the second cylinder (11) is connected to a second U-shaped frame (31), and a second pressing roller (30) is rotatably arranged inside the second U-shaped frame (31).

5. The fully automatic biaxially stretched sheet preheating machine according to claim 1, characterized in that: Fixed tubes (24) are fixedly arranged on both sides of the bottom of one side of the square frame (13) facing the discharge port, and the two fixed tubes (24) extend upward through the partition (23) and the upper wall of the chassis (1); a second sliding sleeve (36) is slidably arranged on each of the fixed tubes (24), and a connecting head (35) is fixedly arranged on each of the second sliding sleeves (36), and a sensing rod (37) is connected between the two connecting heads (35); a limit block (37) is fixedly arranged in the middle of each of the fixed tubes (24); 27); a detection rod (32) is slidably arranged in one of the fixed tubes (24); the upper end of the detection rod (32) is connected to a limit plate (33); a first spring (34) is connected between the limit plate (33) and the fixed tube (24); a U-shaped groove (38) is provided on the lower side of the fixed tube (24); a limit screw (39) is fixed at the bottom of the detection rod (32); the limit screw (39) extends out of the U-shaped groove (38) toward one end of the sensing rod (37).

6. The fully automatic biaxially stretched sheet preheating machine according to claim 1, characterized in that: A heating orifice plate (22) is provided inside the chassis (1), and the heating orifice plate (22) and a partition plate (23) separate a heating chamber from the chassis (1), a ventilation hood (18) is provided in the heating chamber, and an air inlet (17) connected to the ventilation hood (18) is provided on the upper wall of the chassis (1).

7. The fully automatic biaxially stretched sheet preheating machine according to claim 1, characterized in that: The rolling element comprises two first fixing plates (15) for fixing to an upper movable frame (16) or a lower movable frame (14), and a first pull-tab roller (26) is rotatably connected between the two first fixing plates (15).

8. The fully automatic biaxially stretched sheet preheating machine according to claim 1, characterized in that: The chassis (1) is also provided with a control panel (6).

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