A bending device for plastic sheets

Abstract

This invention discloses a bending device for plastic sheets, relating to the field of plastic sheet bending. It solves the problem that existing bending devices for plastic sheets are difficult to automatically compress and limit the upper side of the bending area of ​​plastic sheets of different thicknesses, reducing the arc length on both sides of the bending area and achieving precise, small-range bending. The device includes a machine body, a lifting rod, a compression mechanism, a limiting mechanism, and a release mechanism. A heating blade is fixedly connected to the bottom of the lifting rod. The compression mechanism includes a pressing plate and a roller. This bending device for plastic sheets, when the lifting rod moves downwards, simultaneously moves the pressing plate and roller downwards to press the plastic sheet and to both sides to provide operating space for the heating blade. When the lifting rod is raised, the pressing plate and roller move towards the heating area, always adhering to the upper side of the plastic sheet to assist in compression during the bending process. Bending at this time ensures precise compression of the upper sides of the bending area of ​​the plastic sheet, preventing the bending area from becoming too large.

Description

Technical Field

[0001] This invention relates to the field of plastic sheet bending technology, specifically to a bending device for plastic sheets. Background Technology

[0002] Plastic sheets are sheets made of plastic, a synthetic resin material that is easy to use and handle. Plastic sheets come in different categories, and their application varies depending on the environment. Due to processing techniques, plastic sheets are typically flat to facilitate production, transportation, and reduce storage space. However, depending on the application scenario, sometimes bent plastic sheets are needed, such as for display stands and corner wrapping.

[0003] Existing bending equipment for plastic sheets fixes one side of the sheet during bending, then uses a heating device to compress and heat the area to be bent. Once the plastic temperature at that location reaches a set temperature, the heating device is removed, and a bending pusher is activated to bend the sheet along the heated area. However, to allow space for the heating device, existing bending equipment often only fixes one edge of the sheet, making it difficult to fix both sides of the heated area. This results in a larger bending area and makes it difficult to ensure that bending only the heated straight area is achieved. Since heat diffuses to both sides during heating, if the sheet is not adequately fixed on both sides, the bending area will increase, and the arc length on both sides of the bending area will increase, affecting the curvature of the bend angle. Therefore, we propose a bending equipment for plastic sheets. Summary of the Invention

[0004] The purpose of this invention is to provide a bending device for plastic sheets that facilitates the prevention of excessive bending area and improves bending accuracy, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a bending device for plastic sheets, comprising a machine body, a lifting rod, an extrusion mechanism, a limiting mechanism, and a release mechanism. A rotating shaft is rotatably connected to the machine body, and a bending plate is fixedly connected to the rotating shaft. A heating blade is fixedly connected to the bottom of the lifting rod. Both ends of the lifting rod are provided with driving devices for moving and lifting the lifting rod on the machine body. The machine body is provided with a pushing device for pushing the bending plate to rotate and bend. The extrusion mechanism includes a pressing plate and a roller. When the lifting rod moves downward, the extrusion mechanism, in conjunction with the pressing plate and the roller, presses the plastic sheet downward while simultaneously moving to both sides to apply pressure to the bending plate. The hot knife provides operating space and, when the lifting rod is raised, causes the pressing plate and the roller to move towards the heating area, always adhering to the upper side of the plastic sheet for compression during bending. The limiting mechanism, installed on the machine body, limits the height of the pressing plate and the roller when the lifting rod moves down, and continues to limit them after the lifting rod is raised, ensuring that the upper side of the plastic sheet is always compressed and limited. The releasing mechanism, installed on the machine body, releases the limiting mechanism in conjunction with the bending plate after it is bent and returns to a horizontal state, allowing the pressing plate and the roller to move upward and release the compression limit on the plastic sheet, thus preventing the bending area from becoming too large and improving bending accuracy.

[0006] Preferably, the extrusion mechanism includes two sets of connecting blocks, which are located at the two ends of the roller and the pressing plate, respectively. A first slide rail is fixedly connected to the connecting block, and a first rotating shaft is rotatably connected to the connecting block. A second slide rail is fixedly connected to one end of the first rotating shaft, and a spring-loaded spring fixedly connected to the first rotating shaft and the connecting block is fixedly connected to the first rotating shaft. A support plate is fixedly connected to the bottom of the connecting block. The first slide rail and the second slide rail are provided with connecting parts for connecting to the pressing plate and the roller, respectively, to facilitate extrusion of both sides of the bending area.

[0007] Preferably, the connecting member includes a first slider fixedly installed on the side of the pressing plate, a first spring fixedly connected inside both the first slide rail and the second slide rail, the first slider being slidably connected to the first slide rail, one side of the first slider being fixedly connected to the first spring, a second slider being rotatably connected to both ends of the roller, the second slider being slidably connected to the second slide rail, one side of the second slider being fixedly connected to the first spring, and a driving member is provided below the lifting rod for moving the pressing plate and the roller when the lifting rod moves down, so as to facilitate connection with the pressing plate and the roller respectively.

[0008] Preferably, the driving component includes a pressing block installed below the lifting rod, a second rotating shaft fixedly connected to both the first and second sliders, two sets of connecting rods rotatably connected to the pressing block and respectively rotatably connected to the two sets of second rotating shafts, a fixed frame fixedly connected to the machine body, the connecting block and the fixed frame slidingly connected in the vertical direction, a second spring fixedly connected to the bottom of the connecting block and fixedly connected to the machine body, and a first push block fixedly connected to both ends of the lifting rod for pushing the pressing blocks on both sides to press down, so as to drive the pressing plate and roller to move when the lifting rod moves down.

[0009] Preferably, the limiting mechanism includes two sets of inflation tubes fixedly installed on the machine body. The two sets of inflation tubes are respectively located at both ends of the pressing plate. A push rod is slidably connected inside the inflation tube. A third spring is fixedly connected to the bottom of the push rod and fixedly connected to the inflation tube. A second push block for pushing the push rod downward is fixedly connected to the side of the lifting rod. A connecting pipe is connected to the bottom side of the inflation tube. A guide rod is slidably connected to the inner wall of one end of the connecting pipe. The guide rod is fixedly connected to the side of the connecting block. The inflation tube is provided with a limiting member for limiting the position of the push rod, so that the bottom of the pressing plate and the roller are always pressed against the top of the plastic sheet.

[0010] Preferably, the limiting component includes a snap-fit ​​block that passes through one side of the inflation tube and is slidably connected to the inflation tube. A mounting bracket is fixedly connected to the side of the inflation tube, and a fourth spring is fixedly connected to the mounting bracket. One end of the fourth spring is fixedly connected to the snap-fit ​​block. Multiple sets of equally spaced oblique tooth grooves are provided on the side of the push rod. The snap-fit ​​block slidably engages with the oblique tooth grooves to facilitate limiting the position of the push rod.

[0011] Preferably, the release mechanism includes a turntable coaxially fixedly installed at both ends of the rotating shaft, a first tension spring fixedly connected to the body, a drive rod fixedly connected to the top of the first tension spring and slidably connected to the side of the inflation tube, a trapezoidal block fixedly connected to the top of the drive rod, a triangular block slidably connected to the inclined surface of the trapezoidal block fixedly connected to the side of the locking block, and a release component provided on the drive rod for releasing the locking action of the locking block by moving the drive rod upward when the turntable rotates counterclockwise to reset to a horizontal state, so as to release the downward pressure on the connecting block when the bending is completed.

[0012] Preferably, the release mechanism includes multiple sets of plug-in blocks, and the drive rod has multiple sets of equally spaced sliding grooves. The multiple sets of plug-in blocks are slidably connected to the multiple sets of sliding grooves respectively. One end of each plug-in block is fixedly connected to a fifth spring that is fixedly connected to the sliding groove. The side of the turntable is provided with multiple sets of helical teeth that mesh with the plug-in blocks, so that when the turntable rotates counterclockwise to reset to a horizontal state, the drive rod moves upward to release the locking action of the locking block.

[0013] Preferably, the upper and lower sides of the end of the plug block near the helical tooth block are both designed with slopes, and the slope of the upper slope is greater than that of the lower slope. This helps to reduce the thrust of the helical tooth block on the plug block when the turntable rotates clockwise, while increasing the thrust of the helical tooth block on the plug block when the turntable rotates counterclockwise.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The present invention provides a bending device for plastic sheets. By placing the plastic sheet to be bent above the machine body (below the pressing plate and roller), so that the area to be bent is below the heating blade, the drive device is started, causing the lifting rod to move downward. The lifting rod causes the first push blocks on both sides to move downward and contact the top of the lower pressure block. The lower pressure block is continuously pushed downward, thereby causing the connecting rods on both sides to push the second rotating shaft to both sides. The first slider and the second slider respectively drive the pressing plate and roller to slide to both sides while squeezing the first spring. When the second push block contacts the top of the pushing rod... Upon contact, the push rod is pushed downward by the second push block, discharging the gas in the inflation tube through the connecting pipe to the upper end of the guide rod, thus squeezing the guide rod downward. The guide rod then drives the connecting block to move the first and second slide rails downward. This achieves the purpose of simultaneously driving the pressing plate and roller downward to squeeze the plastic sheet while moving to both sides to reserve heating space. At the same time, the device uses the gas in the inflation tube to push and press the guide rod downward, ensuring that the pressing plate and roller are in a relatively buffered state when they contact the top surface of the plastic sheet, while also ensuring sufficient squeezing contact effect.

[0016] 2. The present invention provides a bending device for plastic sheets. A driving device raises a lifting rod, at which point the top of the lower pressure block is not under pressure. Under the rebound of the first springs on both sides, the pressing plate and roller gradually move towards the center, bringing them closer to the heating position and improving the limiting effect during bending. At this point, the locking block provides unidirectional locking to the oblique tooth groove, preventing the pushing rod from moving upwards. The driving device then starts, pushing the bending plate to rotate around the rotating shaft, lifting one side of the plastic sheet upwards for bending. Under the elastic force of the spring, the second slide rail is always in a downward swinging trend. The bending of the plastic sheet pushes the roller upwards, causing the second slide rail to gradually rotate clockwise around the first rotating shaft. The rotational design of the lower pressure block and connecting rod ensures that the roller and second slide rail can rotate to a certain extent while continuously squeezing and limiting the upper side of the plastic sheet. After bending, the bending plate rotates in the opposite direction to return to a horizontal state, completing the bending process. This device achieves a tight squeezing effect on both sides of the bending area, preventing the bending area from becoming too large and improving bending accuracy.

[0017] 3. The present invention provides a bending device for plastic sheets. The bending plate drives the rotating shaft to rotate, which in turn drives the turntables on both sides to rotate. The turntables drive the helical tooth block to rotate. During bending, the helical tooth block pushes the insertion block downwards without releasing the locking block's restriction on the helical tooth groove. When bending ends, the helical tooth block rotates in the opposite direction, pushing the insertion block upwards, which in turn drives the drive rod to gradually move upwards. The inclined surface of the trapezoidal block contacts the triangular block and pushes the triangular block, causing the locking block to slide horizontally together. The locking block compresses the fourth spring while releasing its engagement with the helical tooth groove. At this time, the drive rod is lifted by the third spring below it, guiding... As the downward pressure on the rod decreases, the second spring rebounds, causing the connecting block to move upward. The pressing plate and roller move upward to complete the reset, releasing the downward pressure on the plastic sheet. At the same time, under the tension of the first tension spring, when the helical tooth block stops rotating counterclockwise, the plug block is no longer pushed upward. At this time, the first tension spring will slowly pull the drive rod downward. After the plug block slides into the sliding groove, it moves down to the set position and completes the reset. At the same time, the trapezoidal block releases the push on the triangular block, and the locking block completes the reset, thus completing the reset operation of the entire device. At this time, the bent plastic sheet can be removed and the next bending operation can be performed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 for Figure 1 Enlarged view of region A in the middle;

[0020] Figure 3 This is a schematic diagram of the bottom structure of the present invention;

[0021] Figure 4This is a schematic diagram of the structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the limiting mechanism structure of the present invention;

[0023] Figure 6 for Figure 5 Enlarged view of region B in the middle;

[0024] Figure 7 This is a schematic diagram of the release mechanism structure of the present invention;

[0025] Figure 8 for Figure 7 Enlarged view of region C;

[0026] Figure 9 This is a schematic diagram of the connector structure of the present invention;

[0027] Figure 10 This is a schematic diagram of the extrusion mechanism of the present invention;

[0028] Figure 11 This is a schematic diagram of the driving component structure of the present invention.

[0029] In the diagram: 1-Machine body; 2-Lifting rod; 3-Rotating shaft; 4-Bending plate; 5-Heating blade; 6-Drive device; 7-Pushing device; 8-Extrusion mechanism; 9-Pressing plate; 10-Roller; 11-Limiting mechanism; 12-Release mechanism; 13-Connecting block; 14-First slide rail; 15-First rotating shaft; 16-Second slide rail; 17-Curled spring; 18-Support plate; 19-Connecting piece; 20-First slider; 21-First spring; 22-Second slider; 23-Driver; 24-Lowering block; 25-Second rotating shaft; 2 6-Connecting rod; 27-Fixing bracket; 28-Second spring; 29-First push block; 30-Inflation tube; 31-Push rod; 32-Third spring; 33-Second push block; 34-Connecting tube; 35-Guide rod; 36-Limiting component; 37-Snap-fit ​​block; 38-Mounting bracket; 39-Fourth spring; 40-Helical tooth groove; 41-Turntable; 42-First tension spring; 43-Drive rod; 44-Trapezoidal block; 45-Triangular block; 46-Release component; 47-Plug-in block; 48-Sliding groove; 49-Fifth spring; 50-Helical tooth block. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1-11This invention provides a technical solution: a bending device for plastic sheets, comprising a machine body 1, a lifting rod 2, an extrusion mechanism 8, a limiting mechanism 11, and a release mechanism 12. A rotating shaft 3 is rotatably connected to the machine body 1, and a bending plate 4 is fixedly connected to the rotating shaft 3. A heating blade 5 is fixedly connected to the bottom of the lifting rod 2. Both ends of the lifting rod 2 are equipped with driving devices 6 for moving and lifting the lifting rod 2 on the machine body 1. The machine body 1 is equipped with a pushing device 7 for pushing the bending plate 4 to rotate and bend. Both the driving device 6 and the pushing device 7 are existing mechanisms, only achieving simple moving, lifting, and pushing actions, which can be achieved using existing electric push rods. The extrusion mechanism 8 includes a pressing plate 9 and a roller 10. The extrusion mechanism 8 is used to press the lifting rod... 2. When moving downwards, the linkage pressing plate 9 and roller 10 press down on the plastic sheet while moving to both sides to reserve operating space for the heating blade 5. When the lifting rod 2 is raised, the pressing plate 9 and roller 10 move towards the heating area and always adhere to the upper side of the plastic sheet to assist in the bending process for compression. The limiting mechanism 11 is installed on the machine body 1 to limit the height of the pressing plate 9 and roller 10 when the lifting rod 2 moves downwards, and continues to limit after the lifting rod 2 is raised, ensuring that the upper side of the plastic sheet is always compressed and limited. The releasing mechanism 12 is installed on the machine body 1 to release the limiting mechanism 11 in conjunction with the bending plate 4 after it is bent and returned to the horizontal state, so that the pressing plate 9 and roller 10 move upwards to release the compression limit on the plastic sheet.

[0032] The extrusion mechanism 8 includes two sets of connecting blocks 13, which are located at the two ends of the roller 10 and the pressing plate 9, respectively. A first slide rail 14 is fixedly connected to the connecting block 13, and a first rotating shaft 15 is rotatably connected to the connecting block 13. A second slide rail 16 is fixedly connected to one end of the first rotating shaft 15. A spring spring 17 fixedly connected to the connecting block 13 is fixedly connected to the first rotating shaft 15. A support plate 18 is fixedly connected to the bottom of the connecting block 13. The support plate 18 is used to support the bottom of the second slide rail 16 to ensure its horizontal state. The first slide rail 14 and the second slide rail 16 are provided with connecting parts 19 for connecting to the pressing plate 9 and the roller 10, respectively.

[0033] The connector 19 includes a first slider 20 fixedly installed on the side of the pressing plate 9. A first spring 21 is fixedly connected in both the first slide rail 14 and the second slide rail 16. The first slider 20 is slidably connected to the first slide rail 14. One side of the first slider 20 is fixedly connected to the first spring 21. A second slider 22 is rotatably connected to both ends of the roller 10. The second slider 22 is slidably connected to the second slide rail 16. One side of the second slider 22 is fixedly connected to the first spring 21. A drive component 23 is provided below the lifting rod 2 to drive the pressing plate 9 and the roller 10 to move when the lifting rod 2 moves down.

[0034] The driving component 23 includes a pressing block 24 installed below the lifting rod 2. A second rotating shaft 25 is fixedly connected to both the first slider 20 and the second slider 22. Two sets of connecting rods 26 are rotatably connected to the pressing block 24 and are respectively rotatably connected to the two sets of second rotating shafts 25. The first slide rail 14 and the second slide rail 16 are of the same length, and the two sets of connecting rods 26 are of the same length. A fixing frame 27 is fixedly connected to the body 1. The connecting block 13 is slidably connected to the fixing frame 27 in the vertical direction. A second spring 28 is fixedly connected to the bottom of the connecting block 13 and is fixedly connected to the body 1. A first push block 29 is fixedly connected to both ends of the lifting rod 2 for pushing the pressing blocks 24 on both sides to press down.

[0035] The limiting mechanism 11 includes two sets of inflation tubes 30 fixedly installed on the body 1. The two sets of inflation tubes 30 are located at both ends of the pressing plate 9. A push rod 31 is slidably connected inside the inflation tube 30. A third spring 32, which is fixedly connected to the bottom of the push rod 31, is fixedly connected to the inflation tube 30. A second push block 33 for pushing the push rod 31 downward is fixedly connected to the side of the lifting rod 2. A connecting pipe 34 is connected to the bottom side of the inflation tube 30. A guide rod 35 is slidably connected to the inner wall of one end of the connecting pipe 34. The guide rod 35 is connected to the connecting block 13. The side of the push rod 31 is fixedly connected. The inflation tube 30 is provided with a limiting member 36 for limiting the position of the push rod 31. The limiting member 36 includes a snap-fit ​​block 37, which passes through one side of the inflation tube 30 and is slidably connected to the inflation tube 30. The side of the inflation tube 30 is fixedly connected to a mounting bracket 38, and a fourth spring 39 is fixedly connected to the mounting bracket 38. One end of the fourth spring 39 is fixedly connected to the snap-fit ​​block 37. The side of the push rod 31 has multiple sets of equally spaced oblique tooth grooves 40, and the snap-fit ​​block 37 is slidably snapped into the oblique tooth grooves 40.

[0036] The release mechanism 12 includes a turntable 41 coaxially fixedly installed at both ends of the rotating shaft 3. A first tension spring 42 is fixedly connected to the body 1. A drive rod 43 that is slidably connected to the side of the inflation tube 30 is fixedly connected to the top of the first tension spring 42. A trapezoidal block 44 is fixedly connected to the top of the drive rod 43. A triangular block 45 that is slidably connected to the inclined surface of the trapezoidal block 44 is fixedly connected to the side of the locking block 37. The drive rod 43 is provided with a release component 46 for releasing the locking action of the locking block 37 when the turntable 41 rotates counterclockwise to reset to the horizontal state.

[0037] The release component 46 includes multiple sets of plug-in blocks 47. Multiple sets of equally spaced sliding grooves 48 are provided in the drive rod 43. The multiple sets of plug-in blocks 47 are slidably connected to the multiple sets of sliding grooves 48 respectively. One end of the plug-in block 47 is fixedly connected to a fifth spring 49 that is fixedly connected to the sliding groove 48. The side of the turntable 41 is provided with multiple sets of helical tooth blocks 50 that mesh with the plug-in blocks 47. The upper and lower sides of the plug-in block 47 near the helical tooth block 50 are both designed with slopes, and the slope of the upper slope is greater than that of the lower slope.

[0038] By placing the plastic sheet to be bent above the machine body 1 (below the pressing plate 9 and roller 10), so that the area to be bent is below the heating blade 5, the drive device 6 is activated, causing the lifting rod 2 to move downward. The lifting rod 2 causes the first push blocks 29 on both sides to move downward and contact the top of the lower pressure block 24, continuously pushing the lower pressure block 24 downward, thereby causing the connecting rods 26 on both sides to push the second rotating shaft 25 to both sides. The first slider 20 and the second slider 22 respectively drive the pressing plate 9 and roller 10 to slide to both sides while squeezing the first spring 21. When the second push block 33 contacts the top of the push rod 31, the push rod 31 is... The second pusher 33 pushes downward, discharging the gas in the inflation tube 30 through the connecting tube 34 to the upper end of the guide rod 35, squeezing the guide rod 35 downward. The guide rod 35 drives the connecting block 13, causing the first slide rail 14 and the second slide rail 16 to move downward. This achieves the purpose of driving the pressing plate 9 and the roller 10 downward to squeeze the plastic sheet while moving to both sides to reserve heating space during heating. At the same time, the device pushes and presses the guide rod 35 downward through the gas in the inflation tube 30, ensuring that the pressing plate 9 and the roller 10 are in a relatively buffered state when they move downward and contact the top surface of the plastic sheet, while also ensuring sufficient squeezing contact effect.

[0039] After the heating blade 5 is heated, the driving device 6 lifts the lifting rod 2. At this time, the top of the lower pressure block 24 is not under pressure. Under the rebound of the first springs 21 on both sides, it pushes the pressing plate 9 and the roller 10 to gradually move closer to the center, making them closer to the heating position and improving the limiting effect during bending. At this time, due to the one-way locking and limiting of the locking block 37 on the oblique tooth groove 40, the pushing rod 31 cannot move upward. At this time, the driving device 7 starts to push the bending plate 4 to rotate around the rotating shaft 3, pushing one side of the plastic sheet upward for bending. At this time, due to the elastic force of the spring spring 17, the second slide rail 16 is always in a downward swinging trend. At this time, the bending of the plastic sheet will push the roller 10 towards The upper rotation causes the second slide rail 16 to gradually rotate clockwise around the first rotating shaft 15. The rotational design of the lower pressure block 24 and the connecting rod 26 ensures that the roller 10 and the second slide rail 16 can rotate to a certain extent while always squeezing and limiting the upper side of the plastic sheet. After bending, the bending plate 4 rotates in the opposite direction to reset to the horizontal state to complete the bending. This device achieves the effect of tightly squeezing the upper two sides of the bending area, preventing the bending area from being too large and improving the bending accuracy. The function of the roller 10 is to prevent wear on the upper side of the plastic sheet during movement, as the contact point between the roller and the upper part of the plastic sheet will change during bending.

[0040] During bending, the bending plate 4 drives the rotating shaft 3 to rotate, which in turn drives the turntables 41 on both sides to rotate. The turntables 41 drive the helical tooth block 50 to rotate. During the bending process, the helical tooth block 50 pushes the insertion block 47 downward, without releasing the locking block 37 from the helical tooth groove 40. When the bending ends, the helical tooth block 50 rotates in the opposite direction to push the insertion block 47 upward, which drives the drive rod 43 to gradually move upward. The inclined surface of the trapezoidal block 44 contacts the triangular block 45 and pushes the triangular block 45 to drive the locking block 37 to slide horizontally together. The locking block 37 compresses the fourth spring 39 and releases the locking with the helical tooth groove 40. At this time, the push rod 31 is bounced up by the third spring 32 below it, the downward pressure on the guide rod 35 decreases, the second spring 28 rebounds and drives the connecting block 13 to move upward. The pressing plate 9 and the roller 10 move upward to complete the reset and release the downward pressure on the plastic sheet. Under the pressure of the first tension spring 42, when the helical tooth block 50 stops rotating counterclockwise, the plug-in block 47 is not pushed upward. At this time, the first tension spring 42 will slowly pull the drive rod 43 downward. After the plug-in block 47 slides into the sliding groove 48, it moves down to the set position and completes the reset. At the same time, the trapezoidal block 44 releases the push on the triangular block 45, and the locking block 37 completes the reset, thus completing the reset operation of the entire device. At this time, the bent plastic sheet can be removed and the next bending operation can be performed. The upper and lower sides of the plug-in block 47 near the helical tooth block 50 are designed with slopes, and the slope of the upper slope is greater than that of the lower slope. This is to reduce the pushing force of the helical tooth block 50 on the plug-in block 47 when the turntable 41 rotates clockwise, and at the same time increase the pushing force of the helical tooth block 50 on the plug-in block 47 when the turntable 41 rotates counterclockwise.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bending device for plastic sheets, characterized in that, The utility model relates to a plastic plate bending machine, including: The body (1) and the lifting rod (2), the body (1) is rotatably connected with rotating shaft (3), the rotating shaft (3) is fixedly connected with the bending plate (4), the bottom of lifting rod (2) is fixedly connected with heating sword (5), both ends of lifting rod (2) are equipped with the drive equipment (6) for driving lifting rod (2) moves and lifts on body (1), the body (1) is equipped with the pusher (7) for pushing the bending plate (4) and rotates and bends; Further including: The extrusion mechanism (8) includes the pressing plate (9) and the cylinder (10), the extrusion mechanism (8) is used for when the lifting rod (2) is moved down, the pressing plate (9) and the cylinder (10) are linked down to the plastic plate and are moved to both sides to the heating sword (5) reserved operation space, and when the lifting rod (2) is lifted, the pressing plate (9) and the cylinder (10) are moved to the heating area, and always adhere to the upper side of the plastic plate and extrude during the bending process; The limiting mechanism (11) is installed on the body (1), is used for limiting the height of the pressing plate (9) and the cylinder (10) when the lifting rod (2) is moved down, and continuously limits after the lifting rod (2) is lifted, guarantees always extruding the upper side of the plastic plate and limiting; The release mechanism (12) is installed on the body (1), is used for after the bending plate (4) is bent and resets the horizontal state, the limiting mechanism (11) is linked to release the limiting, so that the pressing plate (9) and the cylinder (10) are moved to release the extrusion limiting of the plastic plate.

2. The bending apparatus for plastic sheet material according to claim 1, characterized in that: The extrusion mechanism (8) includes two groups of connecting blocks (13), two groups of the connecting block (13) are located at both ends of the cylinder (10) and the pressing plate (9), the first slide rail (14) is fixedly connected on the connecting block (13), the first rotating shaft (15) is rotatably connected on the connecting block (13), one end of the first rotating shaft (15) is fixedly connected with the second slide rail (16), the first rotating shaft (15) is fixedly connected with the clockwork spring (17) fixedly connected with the connecting block (13), the bottom of the connecting block (13) is fixedly connected with the supporting plate (18), the first slide rail (14) and the second slide rail (16) are equipped with the connecting piece (19) for being connected with the pressing plate (9) and the cylinder (10) respectively.

3. The bending apparatus for plastic sheet material according to claim 2, characterized in that: The connecting piece (19) comprises a first sliding block (20) fixedly installed on the side of the pressing plate (9), first springs (21) fixedly connected in the first sliding rail (14) and the second sliding rail (16), the first sliding block (20) is in sliding connection with the first sliding rail (14), one side of the first sliding block (20) is fixedly connected with the first spring (21), both ends of the roller (10) are rotationally connected with second sliding blocks (22), the second sliding blocks (22) are in sliding connection with the second sliding rail (16), one side of the second sliding block (22) is fixedly connected with the first spring (21), and the driving piece (23) for driving the pressing plate (9) and the roller (10) to move when the lifting rod (2) moves downwards is arranged below the lifting rod (2).

4. The bending apparatus for plastic sheet material according to claim 3, characterized in that: The driving piece (23) comprises a pressing block (24) installed below the lifting rod (2), second rotating shafts (25) fixedly connected on the first sliding block (20) and the second sliding block (22), two groups of connecting rods (26) rotationally connected with the two groups of second rotating shafts (25) are rotationally connected on the pressing block (24), the machine body (1) is fixedly connected with a fixing frame (27), the connecting block (13) is in sliding connection with the fixing frame (27) in the vertical direction, the bottom of the connecting block (13) is fixedly connected with a second spring (28) fixedly connected with the machine body (1), and the first pushing blocks (29) for pushing the two pressing blocks (24) to move downwards are fixedly connected at the two ends of the lifting rod (2).

5. The bending apparatus for plastic sheet material according to claim 4, characterized in that: The limiting mechanism (11) comprises two groups of inflatable pipes (30) fixedly installed on the machine body (1), the two groups of inflatable pipes (30) are located at the two ends of the pressing plate (9), respectively, the inflatable pipe (30) is in sliding connection with a pushing rod (31), the bottom of the pushing rod (31) is fixedly connected with a third spring (32) fixedly connected with the inflatable pipe (30), the side of the lifting rod (2) is fixedly connected with a second pushing block (33) for pushing the pushing rod (31) to move downwards, the side bottom end of the inflatable pipe (30) is in communication connection with a communication pipe (34), the inner wall of one end of the communication pipe (34) is in sliding connection with a guide rod (35), the guide rod (35) is fixedly connected with the side of the connecting block (13), and the inflatable pipe (30) is provided with the limiting piece (36) for limiting the position of the pushing rod (31).

6. The bending apparatus for plastic sheet material according to claim 5, wherein: The limiting piece (36) comprises a clamping block (37) penetrating through one side of the inflatable pipe (30) and in sliding connection with the inflatable pipe (30), the side of the inflatable pipe (30) is fixedly connected with a mounting frame (38), the mounting frame (38) is fixedly connected with a fourth spring (39), one end of the fourth spring (39) is fixedly connected with the clamping block (37), the side of the pushing rod (31) is provided with a plurality of oblique tooth grooves (40) distributed at equal intervals, and the clamping block (37) is in sliding clamping connection with the oblique tooth grooves (40).

7. The bending apparatus for plastic sheet material according to claim 6, characterized in that: The release mechanism (12) comprises a rotating disc (41) coaxially fixedly installed at both ends of the rotating shaft (3), the body (1) is fixedly connected with a first tension spring (42), the top end of the first tension spring (42) is fixedly connected with a driving rod (43) in sliding connection with the side surface of the inflating pipe (30), the top end of the driving rod (43) is fixedly connected with a trapezoidal block (44), the side surface of the clamping block (37) is fixedly connected with a triangular block (45) in sliding connection with the inclined surface of the trapezoidal block (44), and the driving rod (43) is provided with a release part (46) for driving the driving rod (43) to move upward and releasing the clamping effect of the clamping block (37) when the rotating disc (41) is counterclockwise reset to a horizontal state.

8. The bending apparatus for plastic sheet material according to claim 7, characterized in that: The release part (46) comprises a plurality of plug-in blocks (47), the driving rod (43) is provided with a plurality of sliding grooves (48) distributed at equal intervals, a plurality of the plug-in blocks (47) are in sliding connection with a plurality of the sliding grooves (48) respectively, one end of the plug-in block (47) is fixedly connected with a fifth spring (49) in fixed connection with the sliding groove (48), and the side surface of the rotating disc (41) is provided with a plurality of inclined tooth blocks (50) in engagement with the plug-in blocks (47).

9. The bending apparatus for plastic sheet material according to claim 8, characterized in that: The upper side and the lower side of one end of the plug-in block (47) close to the inclined tooth block (50) are designed as inclined surfaces, and the slope of the upper side is greater than that of the lower side.

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