阅读说明：本技术 一种新型结构的半自动吸塑机 (Semi-automatic plastic sucking machine with novel structure ) 是由 易建明 易焜 易煜 于 2021-10-15 设计创作，主要内容包括：本发明涉及吸塑设备技术领域,公开了一种新型结构的半自动吸塑机,包括：机架上至少设有一个以上的工作腔,工作腔的上部设有用于放置板材的开口；开口的下方设有模台升降装置,模台升降装置驱动模台纵向移动对加热软化后的板材吸塑造型；移动加热装置设置在机架后部,移动加热装置驱动移动至开口位置对板材加热软化；压料框升降装置设置在机架上部,压料框升降装置驱动移动至开口位置对板材夹持固定；冷却装置设置在机架的上部,对板材进行冷却。本发明提供一种结构布局合理,操作方式简便的新型结构的半自动吸塑机。(The invention relates to the technical field of plastic suction equipment, and discloses a semi-automatic plastic suction machine with a novel structure, which comprises: the rack is provided with at least more than one working cavity, and the upper part of the working cavity is provided with an opening for placing a plate; a mould platform lifting device is arranged below the opening, and the mould platform lifting device drives the mould platform to move longitudinally to carry out plastic suction moulding on the heated and softened plate; the movable heating device is arranged at the rear part of the frame and is driven to move to an opening position to heat and soften the plate; the pressing frame lifting device is arranged at the upper part of the frame and is driven to move to an opening position to clamp and fix the plate; the cooling device is arranged at the upper part of the frame and used for cooling the plate. The invention provides a semi-automatic plastic sucking machine with a novel structure, which is reasonable in structural layout and simple and convenient in operation mode.)

1. The utility model provides a semi-automatic plastic uptake machine of novel structure which characterized in that includes:

the plate loading machine comprises a machine frame, wherein at least more than one working cavity is arranged on the machine frame, and an opening for placing a plate is formed in the upper part of each working cavity;

the die table lifting device is arranged below the opening and drives the die table to move longitudinally to carry out plastic suction molding on the heated and softened plate;

the movable heating device is arranged at the rear part of the rack and is driven to move to the opening position to heat and soften the plate;

the pressing frame lifting device is arranged on the upper portion of the rack and is driven to move to the opening position to clamp and fix the plate;

and the cooling device is arranged at the upper part of the rack and used for cooling the plate.

2. The semi-automatic vacuum forming machine with the novel structure as claimed in claim 1, wherein: the die table lifting device comprises a die table motor arranged in the rack, the die table arranged below the opening is respectively arranged on the chain wheel assemblies on two sides of the die table and on the guide rods on two sides of the die table, the output end of the die table motor is connected with the chain wheel assemblies through chains, two sides of the die table are provided with connecting supports protruding outwards, the connecting supports are connected with two ends of the chains, guide wheels are arranged on the connecting supports, and the guide wheels are matched with the guide rods when the die table moves longitudinally.

3. The semi-automatic vacuum forming machine with the novel structure as claimed in claim 2, wherein: the movable heating devices are two groups and are respectively arranged on the upper side and the lower side of the opening, the movable heating devices comprise sawtooth supports arranged on the rack, gear shafts meshed with the sawtooth supports and driving motors connected with the gear shafts, guide bars arranged at the positions of the sawtooth supports and electric furnaces arranged on the gear shafts in a sleeved mode, more than one hanging wheel used for being matched with the guide bars is arranged on each electric furnace, and when the electric furnaces move, the hanging wheels are arranged along the guide bars.

4. The semi-automatic vacuum forming machine with a novel structure as claimed in claim 3, wherein: the electric furnace heating device comprises a first detection device and a second detection device, wherein the first detection device is arranged at the rear end position of the electric furnace and used for detecting the movement of the electric furnace, and the electric furnace is driven to heat; the second detection device is arranged at the end position of the movement stroke of the electric furnace, detects the electric furnace and drives the electric furnace to stop moving.

5. The semi-automatic vacuum forming machine with the novel structure as claimed in claim 4, wherein: the material pressing frame lifting device comprises a cylinder group arranged on the rack, a material pressing frame arranged at the output end of the cylinder group and a linkage assembly arranged on the rack, wherein the linkage assembly comprises a rack connected with the material pressing frame, a main rotating shaft meshed with the rack for transmission and an auxiliary rotating shaft arranged between the main rotating shafts, the cylinder group drives the material pressing frame to move downwards, the rack drives the main rotating shaft to rotate, and the main rotating shaft drives the auxiliary rotating shaft to rotate.

6. The semi-automatic vacuum forming machine with the novel structure as claimed in claim 5, wherein: the material pressing frame is provided with an adjusting device, the material pressing frame comprises a pair of parallel transverse frames and a pair of parallel vertical frames, the transverse frames and the vertical frames are enclosed to form a frame body, the vertical frames stretch and move in the vertical direction, the adjusting device is arranged on one side of the vertical frames, the adjusting device comprises an adjusting support, an adjusting motor is installed on the adjusting support, a main screw rod and an auxiliary screw rod are arranged on the other side of the vertical frames, the main screw rod is connected with the auxiliary screw rod through a transmission belt, the adjusting motor drives the main screw rod and the auxiliary screw rod rotate, and the vertical frames are adjusted in a shrinkage mode.

7. The semi-automatic vacuum forming machine with the novel structure as claimed in claim 6, wherein: the window adjusting device is arranged at the opening position and comprises more than four groups of adjusting members, the four groups of adjusting members are sequentially movably connected end to end, the four groups of adjusting members surround the middle to form a square area, and the size of the square area is adjusted by sliding between the adjacent adjusting members.

8. The semi-automatic vacuum forming machine with the novel structure as claimed in claim 7, wherein: the adjusting component comprises a base plate, a sliding groove arranged on the right side of the base plate and a sliding strip arranged on the upper side of the base plate, and the sliding strip adjacent to the adjusting component is arranged in the sliding groove to be adjusted in a sliding mode.

9. The semi-automatic vacuum forming machine with the novel structure as claimed in claim 8, wherein: including preventing the system that falls, prevent the system that falls including setting up the air compressor machine of frame, the air compressor machine through first pipeline with the working chamber is connected, sets up first control switch and setting on the first pipeline are in the third detection device that is used for detecting panel of open position, third detection device detects the drive of soft panel first control switch open to the working chamber is defeated gas.

10. The semi-automatic vacuum forming machine with the novel structure as claimed in claim 9, wherein: the pre-stretching system comprises a second pipeline connected with the air compressor, a second control switch is arranged on the second pipeline, the second pipeline is connected with the working cavity, and a fourth detection device is arranged above the opening and used for detecting the height of a stretched plate and controlling the second control switch to be turned off.

Technical Field

The invention relates to the technical field of plastic suction equipment, in particular to a semi-automatic plastic suction machine with a novel structure.

Background

The plastic sucking machine is also called a thermoplastic forming machine, and is a machine for sucking and manufacturing thermoplastic plastic coiled materials such as PVC, PE, PP, PET, HIPS and the like which are plasticized by heating into high-grade products such as packing decorative boxes, frames and the like with various shapes.

In the existing apparatuses, the vacuum molding machines are classified into a thick sheet vacuum molding machine and a thin sheet vacuum molding machine according to the thickness of a processed product, and it is difficult to realize a full-automatic production operation for the thick sheet vacuum molding machine due to the thickness problem of a processing object. Therefore, most of the thick sheet plastic suction machines adopt a semi-automatic production and processing mode, however, the structural design of the existing thick sheet plastic suction machine is not reasonable enough, so improvement is needed.

Disclosure of Invention

The invention provides a semi-automatic plastic sucking machine with a novel structure to solve the problems in the prior art.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a semi-automatic plastic sucking machine with a novel structure comprises:

the plate loading machine comprises a machine frame, wherein at least more than one working cavity is arranged on the machine frame, and an opening for placing a plate is formed in the upper part of each working cavity;

the die table lifting device is arranged below the opening and drives the die table to move longitudinally to carry out plastic suction molding on the heated and softened plate;

the movable heating device is arranged at the rear part of the rack and is driven to move to the opening position to heat and soften the plate;

the pressing frame lifting device is arranged on the upper portion of the rack and is driven to move to the opening position to clamp and fix the plate;

and the cooling device is arranged at the upper part of the rack and used for cooling the plate.

Further, mould platform elevating gear is including setting up mould platform motor in the frame sets up the mould platform of opening below sets up respectively the sprocket assembly of mould platform both sides and setting are in the guide bar of mould platform both sides, the output of mould platform motor pass through the chain with the sprocket assembly is connected, the both sides of mould platform are equipped with outside outstanding linking bridge, linking bridge is connected with the both ends of chain, the last leading wheel that is equipped with of linking bridge, during the longitudinal movement of mould platform, the leading wheel with the guide bar cooperatees.

Further, it is two sets of to remove heating device, it sets up respectively to remove heating device both sides about the open-ended, remove heating device including installing sawtooth support in the frame, with sawtooth support meshing driven gear shaft, with the driving motor that the gear shaft is connected sets up the gib block of sawtooth support position department and establish with the cover the epaxial electric stove of gear, be equipped with more than one on the electric stove be used for with gib block matched with change gear, when the electric stove removed, the change gear was followed the gib block removes.

The electric furnace heating device further comprises a first detection device and a second detection device, wherein the first detection device is arranged at the rear end position of the electric furnace and used for detecting the movement of the electric furnace and driving the electric furnace to heat; the second detection device is arranged at the end position of the movement stroke of the electric furnace, detects the electric furnace and drives the electric furnace to stop moving.

Furthermore, the material pressing frame lifting device comprises a cylinder group arranged on the rack, a material pressing frame arranged at the output end of the cylinder group and a linkage assembly arranged on the rack, wherein the linkage assembly comprises a rack connected with the material pressing frame, a main rotating shaft meshed with the rack for transmission and an auxiliary rotating shaft arranged between the main rotating shafts, the cylinder group drives the material pressing frame to move downwards, the rack drives the main rotating shaft to rotate, and the main rotating shaft drives the auxiliary rotating shaft to rotate.

Further, be equipped with adjusting device on the pressure material frame, press the material frame to include a pair of parallel arrangement's horizontal frame and a pair of parallel arrangement's mullion, horizontal frame with the mullion encloses to close and forms the framework, the mullion is flexible in vertical direction and is removed, adjusting device sets up one side of mullion, adjusting device is including adjusting the support, install adjusting motor on the adjusting support, via adjusting motor driven main lead screw and setting are in the vice lead screw of mullion opposite side, main lead screw pass through the drive belt with vice lead screw is connected, adjusting motor drive main lead screw when vice lead screw rotates, the mullion shrink is adjusted.

Furthermore, a window adjusting device is arranged at the opening position and comprises more than four groups of adjusting members, the four groups of adjusting members are sequentially movably connected end to end, the four groups of adjusting members surround the middle to form a square area, and the size of the square area is adjusted by sliding between the adjacent adjusting members.

Further, the adjusting component comprises a base plate, a sliding groove arranged on the right side of the base plate and a sliding strip arranged on the upper side of the base plate, and the sliding strip adjacent to the adjusting component is arranged in the sliding groove to be adjusted in a sliding mode.

Further, including preventing the system that falls that hangs down, it is in to prevent the system that falls that hangs down including setting up the air compressor machine of frame, the air compressor machine through first pipeline with the working chamber is connected, sets up first control switch and setting on the first pipeline are in the third detection device that is used for detecting panel of open position, third detection device detects the drive of softened panel first control switch open to the working chamber is defeated the gas.

The pre-stretching system comprises a second pipeline connected with the air compressor, a second control switch is arranged on the second pipeline, the second pipeline is connected with the working cavity, and a fourth detection device is arranged above the opening and used for detecting the height of the stretched plate and controlling the second control switch to be turned off.

Compared with the prior art, the invention has the beneficial effects that: the structure arrangement of the plastic suction machine is improved, when the plastic suction machine works, a thick sheet plate is arranged at the opening position, the plate is pressed by the pressing frame lifting device, then the heating device is moved to heat and soften the plate, then the plate is moved to the plate position by the die table lifting device to be subjected to plastic suction molding, and finally the plate is cooled and demoulded by the cooling device.

Meanwhile, the structure of the die table lifting device and the material pressing frame lifting device is improved, and the stability of the die table and the material pressing frame in the moving process is improved. Furthermore, in order to realize the energy-saving function, a corresponding structure is arranged on the movable heating device, the electric furnace is controlled to be heated when the electric furnace is moved out, and the electric furnace is not heated when the electric furnace does not work. Furthermore, for thick sheet materials with different sizes, the window adjusting device and the material pressing frame adjusting device are designed for adjustment. Furthermore, in order to avoid the fire hazard caused by the softening and falling of thick plates, a corresponding anti-falling system is designed, and meanwhile, a corresponding pre-stretching system is arranged for providing the plastic suction quality of the plastic suction products.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is a partial structural schematic diagram of the present invention.

Fig. 3 is a schematic structural view of the die table lifting device.

Fig. 4 is a schematic structural view of the mobile heating device.

Fig. 5 is a partial structural schematic diagram of the present invention.

Fig. 6 is a partial structural schematic view of the pressing frame lifting device.

Fig. 7 is a schematic structural view of the material pressing frame adjusting device.

Fig. 8 is a schematic structural view of the window regulator.

Fig. 9 is a structural schematic view of the adjustment member.

Fig. 10 is a partial structural schematic of the present invention.

Fig. 11 is a partial structural schematic of the present invention.

Fig. 12 is a partial structural schematic of the present invention.

Reference numerals: 1. a frame; 2. a working chamber; 3. an opening; 4. a mold table lifting device; 5. moving the heating device; 6. a material pressing frame lifting device; 7. a cooling device; 8. a mold table motor; 9. a mould table; 10. a sprocket assembly; 11. a guide bar; 12. connecting a bracket; 13. a guide wheel; 14. a sawtooth bracket; 15. a gear shaft; 16. a drive motor; 17. a guide strip; 18. an electric furnace; 19. a change gear; 20. a first detection device; 21. a second detection device; 22. a cylinder group; 23. pressing the material frame; 24. a linkage assembly; 25. a rack; 26. a main rotating shaft; 27. a secondary rotating shaft; 28. an adjustment device; 29. a transverse frame; 30. a mullion; 31. adjusting the bracket; 32. adjusting the motor; 33. a main screw rod; 34. a sub screw rod; 35. a window adjusting device; 36. an adjustment member; 37. a substrate; 38. a chute; 39. a slide bar; 40. an air compressor; 41. a first conduit; 42. a first control switch; 43. a third detection device; 44. a second conduit; 45. a second control switch; 46. and a fourth detection device.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiments described by referring to the drawings are exemplary and intended to be used for explaining the present application and are not to be construed as limiting the present application. In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

As shown in fig. 1 to 12, a semi-automatic vacuum forming machine with a novel structure for implementing the present invention is characterized by comprising: the plate loading machine comprises a machine frame 1, wherein at least more than one working cavity 2 is arranged on the machine frame 1, and an opening 3 for placing a plate is formed in the upper part of each working cavity 2; the die table lifting device 4 is arranged below the opening 3, and the die table lifting device 4 drives the die table to move longitudinally to carry out plastic suction molding on the heated and softened plate; the movable heating device 5 is arranged at the rear part of the rack 1, and the movable heating device 5 is driven to move to the position of the opening 3 to heat and soften the plate; the pressing frame lifting device 6 is arranged at the upper part of the rack 1, and the pressing frame lifting device 6 is driven to move to the position of the opening 3 to clamp and fix the plate; and the cooling device 7 is arranged at the upper part of the frame 1, and is used for cooling the plate.

In view of the technical problem recorded in the background art, the semi-automatic plastic sucking machine with the novel structure is provided, and the main purpose is to improve the production efficiency by reasonably arranging the structure of the plastic sucking machine and closely adapting to the plastic sucking operation process.

The specific operation process is as follows: thick sheet panel material loading is to opening 3 position through the manual work, then press material frame elevating gear 6 drive to move down, hold thick sheet panel pressure in opening 3 position department, working chamber 2 becomes encapsulated situation this moment, and then, remove heating device 5 drive and remove to opening 3 position, heat and soften thick sheet panel, thick sheet panel heats and softens the back, remove heating device 5 and reset, and then, mould platform elevating gear 5 rises to the panel position, carry out vacuum plastic uptake molding to the panel after heating and softening, finally, cooling device 7 cools off thick sheet panel, cooling device 7 adopts fan forced air cooling or fog cold form, then, mould platform elevating gear 5 resets the drawing of patterns, take the plastic uptake product through the manual work, accomplish whole plastic uptake product production flow.

As shown in fig. 2-3, the mold table lifting device 4 includes a mold table motor 8 disposed in the frame 1, a mold table 9 disposed below the opening 3, a sprocket assembly 10 disposed on two sides of the mold table 9, and guide rods 11 disposed on two sides of the mold table 9, wherein an output end of the mold table motor 8 is connected to the sprocket assembly 11 via a chain, two sides of the mold table 9 are provided with connecting brackets 12 protruding outwards, the connecting brackets 12 are connected to two ends of the chain, the connecting brackets 12 are provided with guide wheels 13, and when the mold table 9 moves longitudinally, the guide wheels 13 are matched with the guide rods 11.

As a preferred embodiment, in order to improve the stability of the die table 9 during the lifting process, the structure of the die table lifting device 4 is improved, and the specific working process is as follows: move through mould platform motor 8, it is connected with sprocket assembly 11 to establish the chain through the gear cover on the output shaft of mould platform motor 8, sprocket assembly 11 is connected with mould platform 9 through establishing the chain at vertical cover, owing to set up leading wheel 13 at the linking bridge 12 of mould platform 9, thereby during the drive of mould platform motor 8, drive mould platform 9 longitudinal movement through sprocket assembly 11, cooperate between the in-process leading wheel 13 that removes and guide bar 11, the stability of mould platform 9 at the removal in-process has been improved.

Further, as shown in fig. 4, the two sets of the movable heating devices 5 are provided, the movable heating devices 5 are respectively disposed on the upper side and the lower side of the opening 3, each movable heating device 5 includes a saw tooth bracket 14 mounted on the rack 1, a gear shaft 15 meshed with the saw tooth bracket 14 for transmission, a driving motor 16 connected with the gear shaft 15, a guide bar 17 disposed at the position of the saw tooth bracket 14, and an electric furnace 18 sleeved on the gear shaft 15, the electric furnace 18 is provided with more than one hanging wheel 19 used for being matched with the guide bar 17, and when the electric furnace 18 moves, the hanging wheel 19 moves along the guide bar 17.

In the use of reality, the removal heating device 5 that adopts is two sets of, heats thick slice panel respectively, and the heating effect is more even, and heating efficiency is high, simultaneously, for the stability that further improves 18 removals of electric stove, to structural improvement, its concrete working process is: by arranging the saw tooth supports 14 in parallel, when the driving motor 6 drives, the saw tooth supports 14 are moved, in order to improve the stability of movement, guide strips 17 are arranged on the saw tooth supports 14, hanging wheels 19 are arranged on the electric furnace 18, the hanging wheels of the electric furnace 18 are hung on the guide strips 17, and in the moving process of the electric furnace 18, the hanging wheels 19 are moved along the length direction of the guide strips 17.

Furthermore, the electric furnace heating device comprises a first detection device 20 and a second detection device 21, wherein the first detection device 20 is arranged at the rear end position of the electric furnace 18 and is used for detecting the movement of the electric furnace 18, and the electric furnace 18 is driven to heat; the second detection device 21 is arranged at the end position of the movement stroke of the electric furnace 18, and is used for detecting the electric furnace 18 and driving the electric furnace 18 to stop moving.

Because the electric furnace 18 of the existing plastic uptake machine is in a heating state in production, the cost of electricity charge is increased, and therefore, the energy-saving function is added to the electric furnace 18, particularly, when the electric furnace 18 is arranged at the rear end of the frame 1, the electric furnace 18 does not need to be heated. The specific work is as follows: when the electric furnace 18 moves towards the thick sheet, the first detection device 20 is triggered, the electric furnace 18 starts to heat, the electric furnace 18 moves to the position of the thick sheet, the second detection device 21 is triggered, the electric furnace 18 does not move, when the heating time reaches the set time, the electric furnace 18 stops heating, and the electric furnace 18 resets. The first detection means 20 and the second detection means 21 are preferably photoelectric switches.

Referring to fig. 5 to 6, the material pressing frame lifting device 6 includes a cylinder group 22 mounted on the frame 1, a material pressing frame 23 disposed at an output end of the cylinder group 22, and a linkage assembly 24 disposed on the frame 1, the linkage assembly 24 includes a rack 25 connected to the material pressing frame 23, a main rotating shaft 26 meshed with the rack 25 for transmission, and a secondary rotating shaft 27 disposed between the main rotating shafts 26, the cylinder group 22 drives the material pressing frame 23 to move downward, the rack 25 drives the main rotating shaft 26 to rotate, and the main rotating shaft 26 drives the secondary rotating shaft 27 to rotate.

In order to improve the overall stability of the material pressing frame 23 in the moving process, in a specific implementation, the cylinder group 22 is specifically four groups of cylinders, the output ends of the cylinder group 22 are respectively connected with the material pressing frame 23, the material pressing frame 23 is respectively provided with four racks 25, the cylinders on the same side are provided with two main rotating shafts 26, the two main rotating shafts 26 are provided with two auxiliary rotating shafts 27 for transmission, when the four groups of cylinders drive and drive the material pressing frame 23 to move downwards, the four racks 25 drive the main rotating shafts 26 to rotate, and the main rotating shafts 26 drive the auxiliary rotating shafts 27 to rotate, so that the moving integrity of the material pressing frame 23 is realized.

As shown in fig. 7, further, an adjusting device 28 is arranged on the pressing frame 23, the pressing frame 23 includes a pair of parallel horizontal frames 29 and a pair of parallel vertical frames 30, the horizontal frames 29 and the vertical frames 30 form a frame, the vertical frames 30 move in a vertical direction in a telescopic manner, the adjusting device 28 is arranged on one side of the vertical frames 30, the adjusting device 28 includes an adjusting bracket 31, an adjusting motor 32 is mounted on the adjusting bracket 31, the main screw 33 is driven by the adjusting motor 32, and an auxiliary screw rod 34 is arranged on the other side of the vertical frames 30, the main screw 33 is connected with the auxiliary screw rod 34 through a transmission belt, and when the adjusting motor 32 drives the main screw 33 and the auxiliary screw rod 34 to rotate, the vertical frames 30 are adjusted in a telescopic manner.

For the problem that the thick sheet materials are different in size, the adjusting device 28 is additionally arranged on the material pressing frame 23, so that the frame body of the material pressing frame 23 is adjusted, and the thick sheet materials are suitable for thick sheet materials of different sizes. The specific adjusting process comprises the following steps: the adjusting motor 32 drives the main lead screw 33 to rotate, and the main lead screw 33 is connected with the auxiliary lead screw 34 through a transmission belt, so that the vertical frame 30 is contracted and adjusted, and the material pressing frame 23 is adjusted.

As shown in fig. 3, 8 and 9, a window adjusting device 35 is disposed at the position of the opening 3, the window adjusting device 35 includes more than four groups of adjusting members 36, the four groups of adjusting members 36 are sequentially and movably connected end to end, the four groups of adjusting members 36 enclose a square area in the middle, and the size of the square area is adjusted by sliding between adjacent adjusting members 36. Specifically, the adjusting member 36 includes a base plate 37, a slide groove 38 disposed on the right side of the base plate 37, and a slide bar 39 disposed on the upper side of the base plate 37, and the slide bar 39 adjacent to the adjusting member 36 is slidably adjusted in the slide groove 38.

For the situation that the thick sheet materials are different in size, the window adjusting device 35 is arranged at the position of the opening 3, and the space of the square area is adjusted through mutual sliding adjustment between the adjacent adjusting components 36, so that the size of the actually required opening 3 is obtained.

As shown in fig. 10 to 11, the present invention further includes a drop-preventing system, wherein the drop-preventing system includes an air compressor 40 disposed on the frame 1, the air compressor 40 is connected to the working chamber 2 through a first pipe 41, a first control switch 42 disposed on the first pipe 41, and a third detection device 43 disposed at the opening 3 for detecting the sheet material, and the third detection device 43 detects the softened sheet material and drives the first control switch 42 to open to transmit air to the working chamber 2.

In the process of heating and softening the thick sheet, the excessively softened sheet is easy to fall on the electric furnace 18, so that accidents such as fire disasters and the like are caused. Aiming at the situation, the anti-falling system is added, the third detection device 43 is triggered mainly through the heating and softening plate, the first control switch 42 is further turned on, the air compressor 40 conveys compressed air to the working cavity 2, the air pressure in the working cavity 2 is increased, and the heating and softening plate is supported and does not fall. The third detection means 43 is preferably an electro-optical switch and the first control switch is preferably a solenoid valve.

Referring to fig. 10 and 12, the present invention further includes a pre-stretching system, the pre-stretching system includes a second pipe 44 connected to the air compressor 40, a second control switch 45 is disposed on the second pipe 44, the second pipe 44 is connected to the working chamber 2, a fourth detecting device 46 is disposed above the opening 3, and the fourth detecting device 46 detects the height of the stretched sheet material and controls the second control switch 45 to be turned off.

In order to improve the uniformity of the plastic suction products, the board after heating and softening is blown and foamed and stretched by adding the pre-stretching system, and the specific process is as follows: compressed gas is conveyed to the working cavity 2 through the air compressor 40, the air pressure in the working cavity 2 rises to stretch the board subjected to heating and softening, the board subjected to bubble stretching triggers the fourth detection device 46, and the second control switch 45 is controlled to be turned off. The fourth detection means 46 is preferably an electro-optical switch and the second control switch 45 is preferably a solenoid valve.

The technical scope of the present invention is not limited to the above embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.