A waste treatment device and method for pvc film production

Abstract

This invention provides a waste treatment device and method for PVB film production. The waste treatment device includes a working chamber, a heating element, a pressure plate, and a stirring assembly. The working chamber is used to contain PVB film waste and has an inlet and outlet at its top. The heating element is used to heat the PVB film waste in the working chamber. The pressure plate is located above the inlet and outlet and can reciprocate vertically under the drive of a first driving device. The pressure plate has a clearance opening. The stirring assembly includes a second driving device, a stirring driving device, and a stirring plate. The second driving device is located on the pressure plate and is used to drive the stirring driving device to reciprocate vertically. This invention heats the PVB film waste using a heating element, causing the PVB film waste to be pressed in a slightly softened state. The thermoplasticity of PVB material allows the PVB film waste to adhere to each other, effectively solving the technical problem that waste blocks obtained by room temperature pressing are prone to springing back and loosening, requiring additional binding.

Description

Technical Field

[0001] This invention relates to the field of waste treatment technology, and more specifically, to a waste treatment device and method for PVB film production. Background Technology

[0002] The content in this section only provides background information related to this invention and may not constitute prior art.

[0003] PVB (polyvinyl butyral) film is a functional film widely used in construction, automotive, and photovoltaic industries, possessing excellent properties such as safety, heat insulation, noise control, and UV protection. During the production of PVB film, scraps and defective products are inevitably generated as waste. This waste is typically in the form of loose flakes or strips, with large volume and low density. Directly stacking it not only occupies a significant amount of storage space but also hinders subsequent transportation and recycling.

[0004] Currently, the main method for handling PVB film production waste is to first crush the sheet-like or strip-shaped waste into fragments or chips using a shredder, and then press the fragments or chips into waste blocks using a pressing device to reduce volume and facilitate storage and transportation. However, when using conventional pressing equipment to press PVB film waste at room temperature, due to the elasticity of the PVB material itself, the pressing process only relies on mechanical external force to temporarily deform the PVB film waste. No effective bonding force is formed between the PVB film waste pieces. When the external force is removed, the elastic recovery force within the material causes the pressed waste blocks to gradually spring back and loosen after a period of time, requiring additional bundling or packaging, increasing the process and cost. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a waste treatment device and method for PVB film production, so as to solve the technical problem that when PVB film waste is pressed at room temperature using conventional pressing equipment, the resulting waste blocks are prone to springing and loosening, requiring additional binding.

[0006] The objective of this invention is achieved through the following technical solution: In a first aspect, the present invention provides a waste treatment device for PVB film production, comprising: The working chamber is used to contain PVB membrane waste, and it has an inlet and outlet at the top; A heating element is used to heat the PVB film waste in the working chamber; A pressure plate is disposed above the inlet and outlet and can reciprocate vertically under the drive of the first driving device; the shape and size of the pressure plate are matched with the inlet and outlet, and the pressure plate is provided with a clearance opening; The stirring assembly includes a second driving device, a stirring drive device, and a stirring plate; the second driving device is disposed on the pressure plate and is used to drive the stirring drive device to reciprocate vertically; the stirring drive device includes a stirring shaft that extends vertically and is rotatable; the stirring plate is disposed at the bottom end of the stirring shaft, and its shape and size are matched with the clearance opening; The stirring plate has a stirring position and a pressing position; in the stirring position, the stirring plate extends downward into the working chamber; in the pressing position, the stirring plate is embedded upward into the clearance opening, and the lower surface of the stirring plate is coplanar with the lower surface of the pressing plate.

[0007] Optionally, the working chamber is vertically divided into a pressing zone and a transition zone located above the pressing zone; the side wall of the working chamber is provided with a feed inlet communicating with the transition zone; and the feed inlet is provided with an openable and closable feed door.

[0008] Optionally, the side wall of the working chamber is also provided with a negative pressure interface communicating with the transition zone, and the negative pressure interface is connected to the negative pressure generating device.

[0009] Optionally, the working chamber has an annular intermediate cavity surrounding the pressing area inside its circumferential sidewall; the heating element is located inside the annular intermediate cavity.

[0010] Optionally, the inner wall of the annular intermediate cavity facing the pressing area is made of a thermally conductive material, and the outer wall of the annular intermediate cavity away from the pressing area is made of a thermally insulating material.

[0011] Optionally, the stirring assembly further includes a mounting plate; the output end of the second driving device is connected to the mounting plate, and the stirring driving device is disposed on the mounting plate; the shape and size of the mounting plate are matched with the clearance opening; When the stirring plate is in the stirring position, the mounting plate is embedded in the clearance opening.

[0012] Optionally, the stirring assembly further includes stirring blades; The stirring blades are mounted on the stirring shaft and are adjacent to the stirring plate.

[0013] Optionally, the stirring plate is circular; the stirring blades are spiral and extend along the axial direction of the stirring shaft; The diameter of the stirring plate is not less than the maximum outer diameter of the stirring blade.

[0014] Optionally, the bottom of the working chamber is provided with a discharge port; the discharge port is provided with an openable and closable discharge door.

[0015] Secondly, the present invention provides a method for treating waste materials from PVB film production, employing the waste treatment apparatus for PVB film production as described above, comprising the following steps: Keeping the stirring plate in the stirring position, the PVB film waste is fed into the working chamber; The heating element is activated to heat the PVB film waste in the working chamber, and at the same time, the stirring shaft is driven to rotate the stirring plate to stir the PVB film waste. After the PVB film waste is heated to a predetermined temperature, the stirring plate is driven to move upward to the pressing position, so that the stirring plate is embedded in the clearance opening, and the lower surface of the stirring plate is coplanar with the lower surface of the pressing plate. The pressure plate is driven to move downward, and the pressure plate and the stirring plate together press the PVB film waste in the working chamber.

[0016] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects: The waste processing device provided by the present invention heats the PVB film waste with a heating element, so that the PVB film waste is pressed in a slightly softened state. The thermoplasticity of PVB material is used to make the PVB film waste stick together, thereby effectively solving the technical problem that the waste blocks obtained by room temperature pressing are easy to spring back and loosen, and require additional binding.

[0017] Meanwhile, by driving the stirring plate to stir the PVB film waste during the heating process, all PVB film waste can be heated more evenly, avoiding the problem of low temperature and uneven heating in the central area caused by heat transfer only through heat conduction in the static heating method, thus providing a good foundation for subsequent pressing.

[0018] In addition, by setting a stirring plate with a stirring position and a pressing position, it extends downward into the working chamber to stir during the heating stage and embeds upward into the clearance opening of the pressing plate during the pressing stage, forming a pressing surface together with the lower surface of the pressing plate. This achieves the organic integration of stirring and pressing functions, resulting in a compact structure and coordinated functions. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of a waste treatment device for PVB film production provided in an embodiment of the present invention in one state; it shows the situation when the stirring plate is in the stirring position and the mounting plate is just embedded in the clearance opening; Figure 2 for Figure 1 The diagram shows a waste treatment device for PVB film production in another state; it shows the situation when the stirring plate is in the pressing position and the mounting plate is disengaged from the clearance opening. Figure 3 for Figure 1 The diagram shows a three-dimensional structure of the pressure plate and stirring assembly. Figure 4 for Figure 3 The diagram shows a three-dimensional structural schematic of the pressure plate.

[0020] Icons: 10-Working chamber, 11-Inlet / outlet, 12-Feed inlet, 13-Discharge outlet, 14-Pressure zone, 15-Transition zone, 16-Annular intermediate chamber, 17-Negative pressure interface, 20-Heating element, 30-Pressure plate, 31-Avoidance port, 40-First drive device, 50-Stirring assembly, 51-Second drive device, 52-Stirring drive device, 521-Stirring motor, 522-Stirring shaft, 53-Stirring plate, 54-Stirring blade, 55-Mounting plate, 60-Discharge gate, 70-Bracket, 80-Feed gate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the described embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of protection of this invention may have fewer components, other components not shown in the drawings, different components, components with different arrangements, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0023] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Example 1

[0024] Please refer to Figures 1 to 4 As shown, Embodiment 1 of the present invention provides a waste treatment device for PVB film production, particularly a pressing device for pressing PVB film waste, belonging to the technical field of comprehensive utilization of solid waste and processing of non-metallic waste. The PVB film waste described in this embodiment of the invention is PVB film fragments or PVB film debris that has been crushed. like Figure 1 and Figure 2 As shown, the waste treatment device includes a working chamber 10, a heating element 20, a pressure plate 30, a first driving device 40, and a stirring assembly 50.

[0025] The working chamber 10 is used to contain PVB film waste, and its top has an inlet / outlet 11. Preferably, the working chamber 10 is a vertically extending cylindrical structure with a smooth inner wall to facilitate material movement and cleaning. A discharge port 13 can be provided at the bottom of the working chamber 10, and the discharge port 13 is equipped with an openable / closable discharge door 60. The discharge port 13 is used to discharge the pressed waste blocks. The height of the working chamber 10 can be set according to the processing capacity requirements, and its cross-sectional shape can be rectangular or circular.

[0026] Heating element 20 is used to heat the PVB film waste in the working chamber 10. Heating element 20 can be in the form of an electric heating tube, heating wire, or heating jacket, etc. In an embodiment of the invention, heating element 20 is arranged within an annular intermediate cavity 16 located inside the circumferential sidewall of the working chamber 10, as described below, and is evenly distributed circumferentially along the annular intermediate cavity 16 to ensure heating uniformity. The heating power of heating element 20 is adjustable.

[0027] The pressure plate 30 is positioned above the inlet / outlet 11 and can reciprocate vertically under the drive of the first driving device 40. The shape and size of the pressure plate 30 are matched to the inlet / outlet 11 at the top of the working chamber 10. When the pressure plate 30 is pressed down, it can seal the inlet / outlet 11, creating a sealed space within the working chamber 10. Figure 1 and Figure 2 The pressure plate 30 is provided with a clearance opening 31, which penetrates the upper and lower surfaces of the pressure plate 30. Figure 4 Preferably, the clearance opening 31 is a circular opening located at the center of the pressure plate 30. The first drive device 40 can be a linear drive element such as a cylinder, hydraulic cylinder, or electric push rod.

[0028] The stirring assembly 50 includes a second drive device 51, a stirring drive device 52, and a stirring plate 53. The second drive device 51 is mounted on the pressure plate 30 and is used to drive the stirring drive device 52 to move vertically reciprocally. Specifically, the second drive device 51 can be a linear drive element such as a cylinder, a hydraulic cylinder, or an electric push rod.

[0029] For example, refer to Figure 1 , Figure 2 or Figure 3 As shown, a bracket 70 can be provided on the upper surface of the pressure plate 30, and the second drive device 51 can be fixedly mounted on the bracket 70. At this time, the output shaft of the first drive device 40 can be fixedly connected to the top of the bracket 70, so that the first drive device 40 can drive the pressure plate 30, the bracket 70 and the stirring assembly 50 to move vertically back and forth together.

[0030] The stirring drive device 52 includes a stirring motor 521 and a vertically extending and rotatable stirring shaft 522. The output shaft of the stirring motor 521 is connected to the stirring shaft 522 to drive the stirring shaft 522 to rotate. The stirring shaft 522 is a slender rod-shaped structure, with its lower end passing through the clearance opening 31 on the pressure plate 30 and extending into the working chamber 10. A stirring plate 53 is located at the bottom end of the stirring shaft 522, and its shape and size match the clearance opening 31. The stirring plate 53 is preferably a circular plate-shaped structure. The lower surface of the stirring plate 53 is flat, used to form a pressing surface together with the pressure plate 30 during pressing.

[0031] Specifically, the stirring plate 53 has a stirring position and a pressing position. In such a case... Figure 1 As shown in the diagram, the stirring plate 53 extends downwards into the working chamber 10. At this time, the stirring plate 53 is located inside the working chamber 10 and can rotate under the drive of the stirring shaft 522 to stir the PVB film waste within the working chamber 10. Figure 2 As shown in the pressing position, the stirring plate 53 is embedded upward into the relief opening 31, and the lower surface of the stirring plate 53 is coplanar with the lower surface of the pressing plate 30. The lower surfaces of the two together form a complete pressing surface, which can jointly apply pressure to the PVB film waste in the working chamber 10.

[0032] According to an embodiment of the present invention, the operation process of the provided waste treatment device is as follows: Initially, the stirring plate 53 is positioned as follows: Figure 1 The stirring position shown is such that the stirring plate 53 extends downward into the working chamber 10. The pressure plate 30 is located at the inlet and outlet 11 of the working chamber 10 and just closes the inlet and outlet 11.

[0033] Subsequently, PVB membrane waste is fed into the working chamber 10 through the feed inlet 12, which will be described below. After falling into the working chamber 10, the PVB membrane waste surrounds the stirring plate 53.

[0034] The heating element 20 is activated to heat the PVB film waste in the working chamber 10, raising its temperature to the point where the PVB material slightly softens. Simultaneously, the stirring motor 521 is activated, causing the stirring shaft 522 to drive the stirring plate 53 to rotate. During rotation, the stirring plate 53 stirs the PVB film waste, causing it to continuously tumble and mix, thus rapidly transferring heat to all the PVB film waste and minimizing the possibility of the central area experiencing a low temperature.

[0035] Once the PVB film waste is heated to a predetermined temperature, heating and stirring are stopped. Then, the second drive device 51 drives the stirring drive device 52, along with the stirring shaft 522, to move upwards, thereby moving the stirring plate 53 from the stirring position to the pressing position. During this process, the stirring plate 53 gradually embeds itself into the clearance opening 31 of the pressing plate 30 until the lower surface of the stirring plate 53 is flush with the lower surface of the pressing plate 30.

[0036] Next, the first drive device 40 is activated, causing the pressure plate 30 to move downwards. The pressure plate 30, together with the stirring plate 53 embedded therein, presses down to compress the PVB film waste in the working chamber 10. Since the PVB film waste has been heated to a slightly softened state, under pressure, the PVB film waste adheres to each other, forming a dense waste block. After pressing to a predetermined pressure or predetermined thickness, the pressure is maintained for a period of time to allow the waste block to solidify.

[0037] After pressing is completed, the first drive device 40 drives the pressure plate 30 to move upward and reset, opening the discharge port 13 at the bottom of the working chamber 10 to remove the formed waste block. To perform the next cycle, repeat the above steps.

[0038] The waste processing device provided in this embodiment of the invention heats PVB film waste through heating element 20, pressing the PVB film waste in a slightly softened state. The thermoplasticity of PVB material allows the PVB film waste to adhere to each other, effectively solving the technical problem that waste blocks obtained from room temperature pressing are prone to springing back and loosening, requiring additional binding. Furthermore, by driving the stirring plate 53 to stir the PVB film waste during the heating process, all PVB film waste can be heated more evenly, avoiding the problem of low central temperature and uneven heating caused by heat conduction alone in static heating methods, thus providing a good foundation for subsequent pressing. Further, by setting the stirring plate 53 with both stirring and pressing positions, it extends downward into the working chamber 10 for stirring during the heating stage and embeds upward into the clearance opening 31 of the pressing plate 30 during the pressing stage, forming a pressing surface together with the lower surface of the pressing plate 30. This achieves an organic integration of stirring and pressing functions, resulting in a compact structure and coordinated functions.

[0039] In a preferred embodiment of the present invention, reference is made to Figure 1 or Figure 2 As shown, the working chamber 10 is vertically divided into a pressing zone 14 and a transition zone 15 located above the pressing zone 14. Among them, Figure 1 and Figure 2 The horizontal dashed line in the middle can be regarded as the dividing line between the suppression zone 14 and the transition zone 15.

[0040] The side wall of the working chamber 10 is provided with a feed inlet 12 that communicates with the transition zone 15; the feed inlet 12 is provided with an openable and closable feed door 80.

[0041] Specifically, the pressing zone 14 corresponds to the area where the heating element 20 is arranged, and is used to heat and press the PVB film waste. The transition zone 15 is located above the pressing zone 14 and does not have the heating element 20. It is mainly used to receive the PVB film waste fed into the inlet 12 and allow it to fall into the pressing zone 14 under gravity. The inlet 12 is located on the side wall of the working chamber 10 corresponding to the transition zone 15, and its size can be set according to the feeding requirements. The feeding door 80 matches the inlet 12. When the feeding door 80 is closed, it can seal the inlet 12 to prevent heat loss from the inlet 12 during the heating process. When the feeding door 80 is open, it is convenient to feed the PVB film waste into the working chamber 10.

[0042] By setting the feed inlet 12 in the transition zone 15, PVB film waste can be added normally when the stirring plate 53 is in the stirring position and the pressure plate 30 closes the inlet and outlet 11. Correspondingly, during operation, after the driving stirring plate 53 is in the stirring position, the feed door 80 is opened to put the PVB film waste into the working chamber 10. After the feeding is completed, the feed door 80 is closed, and then the heating element 20 is started for heating and stirring.

[0043] In addition, the transition zone 15 also serves the following purpose: During the process of stirring ending and the stirring plate 53 moving upwards towards the pressing position, the stirring plate 53 first enters the transition zone 15 from the pressing zone 14, but before it fully reaches the pressing position, it can briefly pause at this location along with the stirring blades 54 (described below). Then, the stirring shaft 522 can drive the stirring plate 53 and stirring blades 54 to idle, using centrifugal force to throw off the residual PVB film waste on the stirring plate 53 and stirring blades 54, causing it to fall back into the pressing zone 14. This effectively prevents the residual PVB film waste from being carried out of the working chamber 10 as the stirring plate 53 continues to rise, reducing material waste and environmental pollution. In other words, after heating and stirring, the stirring plate 53 is first driven upwards to the transition zone 15 for idling and material removal, and then continues to move upwards to the pressing position.

[0044] In another preferred embodiment of the invention, reference continues to... Figure 1 or Figure 2As shown, the side wall of the working chamber 10 is also provided with a negative pressure interface 17 that communicates with the transition zone 15. This negative pressure interface 17 is connected to a negative pressure generating device (not shown in the figure). The negative pressure interface 17 is located on the side wall of the working chamber 10 corresponding to the transition zone 15, and is connected to the negative pressure generating device (such as a vacuum pump) through a pipeline. Before pressing begins, the negative pressure generating device can be started first, and negative pressure can be drawn into the working chamber 10 through the negative pressure interface 17 to create a certain negative pressure environment inside the working chamber 10. The negative pressure environment helps to expel the air trapped between the layers of PVB film waste, reducing the bubble defects inside the formed waste block; at the same time, the negative pressure can make the softened PVB film waste adhere more tightly, improving the bonding strength; in addition, the negative pressure also helps to extract the small amount of volatiles generated during the heating process in a timely manner, improving the working environment.

[0045] In another preferred embodiment of the invention, reference continues to... Figure 1 or Figure 2 As shown, the working chamber 10 has an annular intermediate cavity 16 surrounding the pressing area 14 inside its circumferential sidewall. Heating elements 20 are disposed within the annular intermediate cavity 16. Specifically, the annular intermediate cavity 16 is a sealed chamber surrounding the pressing area 14, preferably annular in shape. The heating elements 20 are evenly arranged within the annular intermediate cavity 16, heating the PVB film waste within the pressing area 14 through thermal radiation or thermal conduction. This structural design ensures that the heating elements 20 do not directly contact the PVB film waste, while also facilitating the installation and maintenance of the heating elements 20.

[0046] As a further improvement of this embodiment of the invention, the inner wall of the annular intermediate cavity 16 facing the pressing area 14 is made of a thermally conductive material, and the outer wall of the annular intermediate cavity 16 away from the pressing area 14 is made of a thermally insulating material. Specifically, the inner wall of the annular intermediate cavity 16 is made of a material with good thermal conductivity, such as aluminum alloy, copper alloy, or stainless steel, which can quickly transfer the heat generated by the heating element 20 to the pressing area 14; the outer wall of the annular intermediate cavity 16 is made of a material with good thermal insulation properties, such as ceramic fiber or high-temperature heat-insulating coating, which can reduce heat loss to the outside of the working cavity 10, improve thermal efficiency, and at the same time reduce the temperature of the outer wall of the equipment to prevent burns to the operator.

[0047] In a preferred embodiment of the present invention, reference is made to Figures 1 to 3 As shown, the stirring assembly 50 also includes a mounting plate 55. The output end of the second drive device 51 is connected to the mounting plate 55. The stirring drive device 52, especially the stirring motor 521, is mounted on the mounting plate 55. The shape and size of the mounting plate 55 are matched with the clearance opening 31. When the stirring plate 53 is in the stirring position, the mounting plate 55 is inserted into the clearance opening 31.

[0048] Specifically, the mounting plate 55 is a circular plate structure, the shape and size of which match the clearance opening 31 on the pressure plate 30. The output end of the second drive device 51 is fixedly connected to the mounting plate 55 and is used to drive the mounting plate 55 to move vertically reciprocally. The stirring drive device 52 is fixedly mounted on the mounting plate 55 and moves together with the mounting plate 55. When the second drive device 51 drives the mounting plate 55 to move downward, the stirring drive device 52, the stirring shaft 522, and the stirring plate 53 move downward accordingly, so that the stirring plate 53 extends into the working chamber 10; when the second drive device 51 drives the mounting plate 55 to move upward, the stirring drive device 52, the stirring shaft 522, and the stirring plate 53 move upward accordingly, so that the stirring plate 53 retracts.

[0049] More importantly, when the stirring plate 53 is in the stirring position, the mounting plate 55 is precisely embedded in the clearance opening 31 of the pressure plate 30 to seal the clearance opening 31, keeping the working chamber 10 in a sealed state during the stirring process. This design can prevent PVB film waste from flying out of the clearance opening 31 during the stirring process, avoiding material waste and environmental pollution. At the same time, it can reduce heat loss from the clearance opening 31, improve heating efficiency, and reduce energy consumption. In addition, the mounting plate 55 moves with the stirring drive device 52 to seal the clearance opening 31, eliminating the need for an additional sealing mechanism, resulting in a simple and compact structure.

[0050] Correspondingly, during operation, when the driving stirring plate 53 moves downward from the pressing position to the stirring position, the mounting plate 55 moves downward accordingly and gradually embeds into the clearance opening 31; when the stirring plate 53 reaches the stirring position, the mounting plate 55 is fully embedded into the clearance opening 31, sealing the clearance opening 31. Figure 1 When mixing ends and the driving mixing plate 53 moves upward, the mounting plate 55 disengages from the clearance opening 31 first, thus clearing the clearance opening 31 for the mixing plate 53 to retract. See Figure 2 .

[0051] In a preferred embodiment of the present invention, reference continues to... Figures 1 to 3 As shown, the stirring assembly 50 also includes stirring blades 54. The stirring blades 54 are disposed on the stirring shaft 522 and are adjacent to the stirring plate 53.

[0052] Specifically, the stirring blades 54 are fixedly installed on the outer wall of the stirring shaft 522, located above and adjacent to the stirring plate 53. The stirring blades 54 can be straight, oblique, or spiral blades, and their number can be one or more depending on the stirring requirements. During the stirring process, the stirring blades 54 rotate together with the stirring shaft 522, agitating the PVB film waste in the working chamber 10, causing the PVB film waste to continuously tumble and mix, further enhancing the heat transfer effect. The stirring blades 54 are positioned close to the stirring plate 53, ensuring that the PVB film waste near the stirring plate 53 receives stronger agitation, preventing the PVB film waste from accumulating and stagnating around the stirring plate 53, ensuring that the stirring plate 53 can continuously and effectively contact the fresh PVB film waste, improving stirring efficiency and heating uniformity.

[0053] Preferably, the stirring plate 53 is circular. The stirring blades 54 are spiral-shaped and extend axially along the stirring shaft 522. The diameter of the stirring plate 53 is not less than the maximum outer diameter of the stirring blades 54. Specifically, the stirring plate 53 is configured as a circular plate structure, and its diameter can be determined according to the size of the clearance opening 31. The stirring blades 54 are spiral-shaped and extend a certain length axially along the stirring shaft 522, forming a structure similar to a screw conveyor. When the spiral blades rotate, they can generate axial thrust, causing the PVB film waste to move vertically during the stirring process, further enhancing the mixing effect of the material and avoiding the formation of dead zones in the stirring. More importantly, the diameter of the stirring plate 53 is not less than the maximum outer diameter of the stirring blades 54. This dimensional design ensures that when the stirring ends and the stirring plate 53 moves upward and retracts to the pressing position, the stirring blades 54 can smoothly pass through the clearance opening 31 along with the stirring shaft 522, and will not get stuck in the clearance opening 31 or be scratched and damaged by the edge of the clearance opening 31 due to the excessively large outer diameter of the stirring blades 54. Meanwhile, after the stirring plate 53 is embedded in the clearance opening 31, its lower surface is coplanar with the lower surface of the pressure plate 30, forming a complete pressing surface. The stirring blade 54 is located above the pressure plate 30 and does not participate in the pressing process. This design ensures that there is sufficient stirring capacity during the stirring stage and that the stirring plate 53 can be smoothly retracted during the pressing stage to form a flat pressing surface together with the pressure plate 30. Example 2

[0054] Based on Example 1, Example 2 of the present invention also provides a method for treating waste materials used in PVB film production, which employs the waste material treatment device for PVB film production as described in Example 1 above.

[0055] Specifically, the waste treatment method includes the following steps: Step S10. Keep the stirring plate 53 in the stirring position and put the PVB film waste into the working chamber 10.

[0056] Specifically, such as Figure 1As shown, the stirring plate 53 is positioned in the stirring position, that is, the stirring plate 53 extends downward into the working chamber 10 and is located in the pressing area 14. The pressing plate 30 just closes the inlet and outlet 11 of the working chamber 10, and the mounting plate 55 is embedded in the clearance opening 31 on the pressing plate 30. The feed door 80 and the discharge door 60 are both in the closed state.

[0057] Open the feed gate 80 and feed PVB membrane waste into the working chamber 10 through the feed inlet 12. The PVB membrane waste falls from the transition zone 15 into the pressing zone 14, surrounding the stirring plate 53. After feeding is complete, close the feed gate 80.

[0058] Step S20. Start the heating element 20 to heat the PVB film waste in the working chamber 10, and at the same time drive the stirring shaft 522 to rotate the stirring plate 53 to stir the PVB film waste.

[0059] Specifically, the heating element 20 is activated to heat the PVB film waste in the pressing zone 14, raising its temperature to a slightly softened state (e.g., 60-80°C). Within this temperature range, the PVB film waste possesses a certain degree of flexibility but has not yet melted and become viscous. This facilitates movement of the PVB film waste during stirring and prevents premature adhesion between pieces of PVB film waste due to excessive softening, or adhesion to other structures. Simultaneously with heating, the stirring motor 521 is activated, causing the stirring shaft 522 to drive the stirring plate 53 and stirring blades 54 to rotate. During rotation, the stirring plate 53 and stirring blades 54 stir the PVB film waste, causing it to continuously tumble and mix, thereby ensuring that all PVB film waste is heated as evenly as possible.

[0060] During this process, because the mounting plate 55 is embedded in the clearance opening 31, the working chamber 10 remains sealed, effectively preventing PVB film waste from flying out and heat loss. The stirring blades 54 rotate together with the stirring shaft 522 to assist in agitating the PVB film waste and enhance the heat transfer effect. The spiral stirring blades 54 can also generate axial thrust when rotating, causing the PVB film waste to move vertically, further avoiding dead zones in the agitation.

[0061] Step S30. After the PVB membrane waste is heated to a predetermined temperature, the stirring plate 53 is driven to move upward to the pressing position, so that the stirring plate 53 is embedded in the relief opening 31, and the lower surface of the stirring plate 53 is coplanar with the lower surface of the pressing plate 30.

[0062] Specifically, once the PVB film waste is heated to a predetermined temperature, heating and stirring are stopped. At this point, a negative pressure generating device can be activated as needed, drawing negative pressure into the working chamber 10 through the negative pressure interface 17. The negative pressure environment helps to expel air trapped between the layers of PVB film waste, reducing air bubble defects within the formed waste blocks; it also helps to ensure a tighter bond between the softened PVB film waste layers, improving adhesion strength; furthermore, it allows for the timely extraction of small amounts of volatiles generated during heating, improving the working environment.

[0063] Based on this, the second drive device 51 is driven, causing the stirring drive device 52 and the stirring shaft 522 to move upward, and the stirring plate 53 to move upward from the pressing zone 14 to the transition zone 15. At the transition zone 15, the stirring plate 53 can be briefly stopped, and the stirring shaft 522 is driven to make the stirring plate 53 and the stirring blades 54 idle for a certain period of time. Centrifugal force is used to throw off the residual PVB film waste on the stirring plate 53 and the stirring blades 54, so that it falls back into the pressing zone 14, and to prevent the residual waste from being carried out of the working chamber 10 as the stirring plate 53 continues to rise.

[0064] Subsequently, referring to Figure 2 As shown, the second driving device 51 continues to drive the stirring plate 53 to move upward from the transition zone 15 to the pressing position. During this process, the stirring plate 53 gradually embeds itself upward into the relief opening 31 of the pressing plate 30 until the lower surface of the stirring plate 53 is coplanar with the lower surface of the pressing plate 30.

[0065] Step S40. Drive the pressure plate 30 to move downward, and use the pressure plate 30 and the stirring plate 53 together to press the PVB film waste in the working chamber 10.

[0066] Specifically, the first drive device 40 is activated, causing the pressure plate 30 and the stirring plate 53 to move downwards together. The pressure plate 30 and the stirring plate 53 press down together to compress the PVB film waste in the pressing area 14 of the working chamber 10, so as to obtain a waste block composed of PVB film waste. After pressing to a predetermined pressure or predetermined thickness, the pressure is held for a period of time to allow the waste block to solidify.

[0067] Step S50. After pressing is completed, drive the pressure plate 30 together with the stirring assembly 50 to move upward and reset, and take out the pressed waste block.

[0068] Specifically, after pressing is completed, the first driving device 40 drives the pressure plate 30 and the stirring assembly 50 to move upward and reset. The discharge door 60 at the bottom of the working chamber 10 is opened to remove the formed waste block. At this time, the stirring plate 53 is still in the pressing position. If the next cycle is required, steps S10 to S40 above can be repeated.

[0069] Through the above method, the embodiments of the present invention achieve integrated processing of heating, stirring, and pressing of PVB film waste, solving the problem of easy rebound and loosening of waste blocks caused by room temperature pressing. During the heating stage, the PVB film waste is stirred within a slightly softening temperature range to ensure uniform heat transfer. During the pressing stage, pressure is used to fully bond the PVB film waste, resulting in waste blocks with high density and strong bonding force. These blocks maintain stable shape without subsequent binding, simplifying the processing procedures for PVB film waste and reducing costs.

[0070] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A waste treatment device for PVB film production, characterized in that, include: The working chamber is used to contain PVB membrane waste, and it has an inlet and outlet at the top; A heating element is used to heat the PVB film waste in the working chamber; A pressure plate is disposed above the inlet and outlet and can reciprocate vertically under the drive of the first driving device; the shape and size of the pressure plate are matched with the inlet and outlet, and the pressure plate is provided with a clearance opening; The stirring assembly includes a second driving device, a stirring drive device, and a stirring plate; the second driving device is disposed on the pressure plate and is used to drive the stirring drive device to reciprocate vertically; the stirring drive device includes a stirring shaft that extends vertically and is rotatable; the stirring plate is disposed at the bottom end of the stirring shaft, and its shape and size are matched with the clearance opening; The stirring plate has a stirring position and a pressing position; in the stirring position, the stirring plate extends downward into the working chamber. In the pressing position, the stirring plate is embedded upward into the clearance opening, and the lower surface of the stirring plate is coplanar with the lower surface of the pressing plate.

2. The waste treatment device for PVB film production according to claim 1, characterized in that, The working chamber is vertically divided into a pressing zone and a transition zone located above the pressing zone; the side wall of the working chamber is provided with a feed inlet communicating with the transition zone; the feed inlet is provided with an openable and closable feed door.

3. The waste treatment device for PVB film production according to claim 2, characterized in that, The side wall of the working chamber is also provided with a negative pressure interface that communicates with the transition zone, and the negative pressure interface is connected to the negative pressure generating device.

4. The waste treatment device for PVB film production according to claim 2, characterized in that, The working chamber has an annular intermediate cavity surrounding the pressing area inside its circumferential sidewall; the heating element is located inside the annular intermediate cavity.

5. The waste treatment device for PVB film production according to claim 4, characterized in that, The inner wall of the annular intermediate cavity facing the pressing area is made of a thermally conductive material, and the outer wall of the annular intermediate cavity away from the pressing area is made of a thermally insulating material.

6. The waste treatment device for PVB film production according to claim 1, characterized in that, The stirring assembly further includes a mounting plate; the output end of the second driving device is connected to the mounting plate, and the stirring driving device is disposed on the mounting plate; the shape and size of the mounting plate are matched with the clearance opening. When the stirring plate is in the stirring position, the mounting plate is embedded in the clearance opening.

7. The waste treatment device for PVB film production according to claim 1, characterized in that, The stirring assembly also includes stirring blades; The stirring blades are mounted on the stirring shaft and are adjacent to the stirring plate.

8. The waste treatment device for PVB film production according to claim 7, characterized in that, The stirring plate is circular; the stirring blades are spiral and extend along the axial direction of the stirring shaft. The diameter of the stirring plate is not less than the maximum outer diameter of the stirring blade.

9. The waste treatment device for PVB film production according to claim 1, characterized in that, The bottom of the working chamber is provided with a discharge port; the discharge port is provided with an openable and closable discharge door.

10. A method for treating waste materials from PVB film production, comprising using the waste treatment apparatus for PVB film production as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Keeping the stirring plate in the stirring position, the PVB film waste is fed into the working chamber; The heating element is activated to heat the PVB film waste in the working chamber, and at the same time, the stirring shaft is driven to rotate the stirring plate to stir the PVB film waste. After the PVB film waste is heated to a predetermined temperature, the stirring plate is driven to move upward to the pressing position, so that the stirring plate is embedded in the clearance opening, and the lower surface of the stirring plate is coplanar with the lower surface of the pressing plate. The pressure plate is driven to move downward, and the pressure plate and the stirring plate together press the PVB film waste in the working chamber.

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