Press-fit device for PVC plate processing and use method of press-fit device

Abstract

The invention relates to the field of plastic processing, and particularly discloses a pressing device for PVC plate processing and a using method thereof.A closed cavity is formed in a pressing mold through the pressing mold provided with a prismatic groove and an upper sliding plate and a lower sliding plate which are in sliding fit with the inner wall of the pressing mold, so that when a to-be-pressed plate is heated to generate poisonous gas, the poisonous gas can be discharged out of the pressing mold, and the poisonous gas can be discharged out of the pressing mold; toxic gas is sealed in the pressing die and does not overflow, meanwhile, through the prismatic groove which is formed in the inner wall of the pressing die and communicates with the pressing cavity, the poisonous gas exhausted from the pressing gap position of the to-be-pressed plate is conveniently collected, in addition, the poisonous gas is intensively exhausted in cooperation with the air blowing mechanism, the air inlet pipe and the exhaust pipe, and follow-up treatment of the poisonous gas is facilitated; in addition, through the heating cylinder provided with the heating wire, the temperature of the air flow flowing through the pressing die is controlled, and the situation that the hot-press forming quality of the PVC plate is affected due to the fact that the temperature fluctuation in the pressing die is too large is avoided.

Description

Technical Field

[0001] The present invention relates to the field of plastic processing, and more particularly to a pressing device for processing a PVC board and a use method thereof. Background Art

[0002] PVC sheets are composed of a substrate and a decorative panel or decorative film attached to its outer side. This process is usually achieved with the help of a hot press, in which the decorative panel or film is tightly pressed onto the surface of the substrate. Traditionally, the design of the hot press adopts an open layout. This structure can easily cause the various layers of the PVC sheet to decompose due to heat during the hot pressing operation, thereby generating a series of toxic gas emissions. These toxic gases mainly include hydrogen chloride (HCl), polychlorinated biphenyls (PCBs) and many other harmful volatile organic compounds (VOCs), which pose a significant threat to the health of on-site operators.

[0003] A pressing device is needed to centrally collect the toxic gases generated by hot pressing to prevent the potential safety hazards caused by the overflow of toxic gases. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a pressing device for PVC board processing and a method of using the same, which can achieve centralized sealing and centralized collection of toxic gases.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A pressing device for processing PVC boards and a method for using the same comprise a stand and a board to be pressed, wherein a pressing mold is fixedly connected to the middle of the stand, a lower pressing mechanism is provided in the lower part of the pressing mold, the lower pressing mechanism comprises a lower hot pressing plate slidably connected to the inner wall of the pressing mold, a lower sliding plate is fixedly connected to the lower hot pressing plate through a lower fixed column, a lower hydraulic cylinder is fixedly connected to the lower sliding plate, the lower hydraulic cylinder penetrates the bottom plate of the pressing mold and is fixedly connected to the stand; an upper pressing mechanism is provided on the upper part of the pressing mold, the upper pressing mechanism and the lower pressing mechanism have the same structure and are arranged in a mirror image, the upper pressing mechanism comprises an upper hot pressing plate slidably connected to the inner wall of the pressing mold, the upper hot pressing plate is fixedly connected to the upper sliding plate through an upper fixed column, and an upper end of the upper sliding plate is fixedly connected to an upper hydraulic cylinder fixedly connected to the stand; A pressing cavity adapted to the plate to be pressed is provided in the pressing mold. When the plate to be pressed is placed in the pressing cavity, the outer walls around it slide against the inner wall of the pressing cavity. Prismatic grooves distributed evenly are provided on the inner walls around the pressing cavity. Prismatic protrusions matching the prismatic grooves are provided around both the lower sliding plate and the upper sliding plate. When both the lower sliding plate and the upper sliding plate are nested in the pressing mold, the lower sliding plate and the upper sliding plate and the inner wall of the pressing mold enclose a closed cavity, the lower sliding plate and the lower hot pressing plate and the inner wall of the pressing mold enclose a lower horizontal cavity, the upper sliding plate and the upper hot pressing plate and the inner wall of the pressing mold enclose an upper horizontal cavity, and the prismatic groove is located between the lower sliding plate and the upper sliding plate to form a vertical cavity connecting the lower horizontal cavity and the upper horizontal cavity; The lower sliding plate is provided with an air intake passage running vertically through it, and the lower end of the lower sliding plate is fixedly connected with an air intake pipe connected with the air intake passage, and the air intake pipe is connected with the blower mechanism. The upper sliding plate is provided with an exhaust passage running vertically through it, and the upper end of the upper sliding plate is fixedly connected with an exhaust pipe connected with the exhaust passage.

[0007] As a further scheme of the present invention, the blowing mechanism includes a heating cylinder fixedly connected to the lower end of the pressing mold, the air inlet pipe is fixedly connected to the heating cylinder, the heating cylinder is connected to the blower through a first connecting pipe, and the air inlet end of the blower is connected to a filter cylinder; a first temperature sensor is fixedly connected to the lower sliding plate, and the first temperature sensor extends into the cavity between the lower sliding plate and the lower hot pressing plate; a second temperature sensor is fixedly connected to the upper sliding plate, and the second temperature sensor extends into the cavity between the upper sliding plate and the upper hot pressing plate; a heating wire is fixedly connected in the heating cylinder.

[0008] As a further solution of the present invention, a heat exchange cavity is opened in the shell wall of the heating cylinder, the exhaust pipe is connected to the heat exchange cavity through a second connecting pipe, and one end of the heat exchange cavity away from the second connecting pipe is fixedly connected to the exhaust pipe.

[0009] As a further solution of the present invention, the pressing mold is a hollow box structure with an open upper end, the pressing cavity and the prismatic groove are vertical concave cavities with rectangular cross-sections, the prismatic protrusions of both the upper sliding plate and the lower sliding plate are rectangular protrusions with rectangular cross-sections, and the vertical height of the prismatic groove is equal to the vertical height of the pressing cavity.

[0010] As a further solution of the present invention, annular sealing rings distributed along the circumference are fixedly embedded in the circumferential side walls of the upper sliding plate and the lower sliding plate.

[0011] As a further solution of the present invention, the lower fixing column and the upper fixing column are both cylinders.

[0012] As a further solution of the present invention, a spiral guide plate is provided in the heating tube, and a spiral cavity for air flow is formed between the spiral guide plate and the inner wall of the heating tube.

[0013] As a further solution of the present invention, a gas sensor is fixedly connected to the outlet end of the exhaust pipe, and the gas sensor detects the concentration of the toxic gas.

[0014] A method for using a pressing device for processing a PVC board, using the pressing device for processing a PVC board as described above, comprises the following steps: Step 1, unloading: start the lower hydraulic cylinder of the lower pressing mechanism to move the lower hot pressing plate to the upper opening position of the pressing mold, then place the plate to be pressed on the lower hot pressing plate, and then start the lower hydraulic cylinder again to move the plate to be pressed into the pressing cavity of the pressing mold; Step 2, mold closing: start the upper hydraulic cylinder of the upper pressing mechanism, so that the upper hot pressing plate moves downward into the pressing mold and the upper sliding plate completely enters the lower pressing mold; Step 3, hot pressing and exhaust: synchronously start the lower hydraulic cylinder and the upper hydraulic cylinder, start the lower hot pressing plate and the upper hot pressing plate at the same time, and start the blowing mechanism to hot press the plate to be pressed. The blowing mechanism injects external air into the pressing mold and removes the toxic gas in the pressing mold; Step 4, cooling: When the hot pressing time reaches the set value, close the lower hot pressing plate and the upper hot pressing plate, keep the blowing mechanism working, and continuously inject external air into the pressing mold to take away the heat; Step 5, demoulding and discharging: After cooling is completed, close the air blowing mechanism, start the upper hydraulic cylinder first, so that the upper hot pressing plate moves to the top of the pressing mold, and then start the lower hydraulic cylinder, and the lower hot pressing plate pushes the finished pressed plate out of the pressing mold to realize discharging.

[0015] Compared with the prior art, the advantages of the present invention are: (1) The present invention forms a closed cavity in the pressing mold by means of a pressing mold with a prismatic groove and an upper sliding plate and a lower sliding plate that slide with the pressing mold, so that when the plates to be pressed generate toxic gases when heated, the toxic gases are sealed in the pressing mold and do not overflow. At the same time, the prismatic grooves provided on the inner wall of the pressing mold and connected to the pressing cavity facilitate the collection of toxic gases discharged from the pressing gap of the plates to be pressed. In addition, the toxic gases are discharged in a centralized manner in cooperation with the blowing mechanism, the air inlet pipe and the exhaust pipe, so as to facilitate the subsequent treatment of the toxic gases.

[0016] (2) In the process of hot pressing to discharge toxic gases, the present invention monitors the temperature of the external air flow entering the enclosed cavity between the upper sliding plate and the lower sliding plate through the first temperature sensor, and monitors the temperature of the air flow discharged from the enclosed cavity and containing toxic gases through the second temperature sensor; when the temperature of the discharged air flow is lower than the threshold value, the heating wire in the heating cylinder is started to heat the external air flow entering the pressing mold, thereby reducing the temperature difference between the external air flow and the pressing plate being hot pressed, maintaining the hot pressing temperature of the pressing plate, and avoiding the heat at the edge of the pressing plate being extracted during the hot pressing process, which causes poor hot pressing effect at the edge of the pressing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the transverse cross-sectional structure of the present invention; Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 4 It is a schematic diagram of the exploded assembly of the upper pressing mechanism, the lower pressing mechanism and the pressing die in the present invention; Figure 5 It is a schematic diagram of the assembly structure of the lower sliding plate and the pressing mold in the present invention; Figure 6 It is a schematic diagram of the structure of the pressing cavity and the prismatic groove in the present invention; Figure 7 Schematic diagram of the distribution structure of the upper horizontal cavity, the lower horizontal cavity and the vertical cavity in the present invention; Figure 8 It is a schematic diagram of the flow of external airflow in the compression mold; Fig. 9 It is a schematic diagram of the longitudinal cross-sectional structure of the second connecting pipe of the present invention; Fig.10 It is a schematic diagram of the material taking, placing and pressing state of the present invention.

[0018] Explanation of the reference numerals in the figure: 1, stand; 2, pressing mold; 201, pressing cavity; 202, prismatic groove; 203, vertical cavity; 3, lower pressing mechanism; 4, lower hot pressing plate; 5, lower fixed column; 501, lower horizontal cavity; 6, lower sliding plate; 601, air inlet channel; 602, prismatic protrusion; 7, lower hydraulic cylinder; 8, air inlet pipe; 9, first temperature sensor; 10, upper hot pressing plate; 11, upper fixed column; 1101, upper horizontal cavity ; 12. Upper sliding plate; 1201. Exhaust channel; 13. Exhaust pipe; 14. Upper hydraulic cylinder; 15. Second temperature sensor; 16. Upper pressing mechanism; 17. Heating cylinder; 1701. Heat exchange clamping chamber; 1702. Spiral guide plate; 18. First connecting pipe; 19. Blower; 20. Filter cylinder; 21. Second connecting pipe; 22. Heating wire; 23. Exhaust pipe; 24. Gas sensor; 25. Plate to be pressed. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See also Figure 1-10 In one embodiment of the present invention, a laminating device for processing PVC boards comprises a stand 1 and a plate 25 to be pressed, a laminating mold 2 is fixedly connected to the middle of the stand 1, a lower laminating mechanism 3 is arranged in the lower part of the laminating mold 2, the lower laminating mechanism 3 comprises a lower hot pressing plate 4 slidably connected to the inner wall of the laminating mold 2, a lower sliding plate 6 is fixedly connected to the lower hot pressing plate 4 through a lower fixed column 5, a lower hydraulic cylinder 7 is fixedly connected to the lower sliding plate 6, the lower hydraulic cylinder 7 penetrates the bottom plate of the laminating mold 2 and is fixedly connected to the stand 1; an upper laminating mechanism 16 is arranged on the upper part of the laminating mold 2, the upper laminating mechanism 16 has the same structure as the lower laminating mechanism 3 and the two are arranged in a mirror image, the upper laminating mechanism 16 comprises an upper hot pressing plate 10 slidably connected to the inner wall of the laminating mold 2, the upper hot pressing plate 10 is fixedly connected to the upper sliding plate 12 through an upper fixed column 11, and the upper end of the upper sliding plate 12 is fixedly connected to an upper hydraulic cylinder 14 fixedly connected to the stand 1; See also Figure 3 , Figure 6 and Figure 7 The pressing mold 2 is provided with a pressing cavity 201 adapted to the plate 25 to be pressed. When the plate 25 to be pressed is placed in the pressing cavity 201, its outer walls around it slide against the inner wall of the pressing cavity 201. The inner walls around the pressing cavity 201 are provided with equidistantly distributed prismatic grooves 202. The lower sliding plate 6 and the upper sliding plate 12 are both provided with prismatic protrusions 602 that match the prismatic grooves 202. See also Figure 7, when both the lower sliding plate 6 and the upper sliding plate 12 are nested in the pressing mold 2, the lower sliding plate 6 and the upper sliding plate 12 and the inner wall of the pressing mold 2 enclose a closed cavity, the lower sliding plate 6 and the lower hot pressing plate 4 and the inner wall of the pressing mold 2 enclose a lower horizontal cavity 501, the upper sliding plate 12 and the upper hot pressing plate 10 and the inner wall of the pressing mold 2 enclose an upper horizontal cavity 1101, and the prismatic groove 202 is located between the lower sliding plate 6 and the upper sliding plate 12 to form a vertical cavity 203 connecting the lower horizontal cavity 501 and the upper horizontal cavity 1101; See also Figure 3 The lower sliding plate 6 is provided with an air intake passage 601 which runs vertically through the lower sliding plate 6, and the lower end of the lower sliding plate 6 is fixedly connected with an air intake pipe 8 which is in communication with the air intake passage 601, and the air intake pipe 8 is in communication with the blowing mechanism. The upper sliding plate 12 is provided with an exhaust passage 1201 which runs vertically through the upper sliding plate 12, and the upper end of the upper sliding plate 12 is fixedly connected with an exhaust pipe 13 which is in communication with the exhaust passage 1201.

[0023] Specifically, the lower hot pressing plate 4 and the upper hot pressing plate 10 heat and extrude the upper and lower sides of the plate to be pressed 25 simultaneously to achieve double-sided hot pressing. After the plate to be pressed 25 is heated, toxic gas is generated, which flows into the vertical cavity 203 from the pressing gap of the plate to be pressed 25. The blowing mechanism is started, and the blowing mechanism injects external airflow into the air inlet pipe 8. The airflow through the air inlet pipe 8 enters the lower horizontal cavity 501 through the air inlet channel 601. The external airflow enters the vertical cavity 203 through the lower horizontal cavity 501, and then brings the toxic gas into the upper horizontal cavity 1101 through the vertical cavity 203, and then discharges it into the exhaust pipe 13 through the upper exhaust channel 1201 for discharge.

[0024] Compared with the traditional PVC board pressing device, the present invention forms a closed cavity in the pressing mold 2 by means of a pressing mold 2 with a prismatic groove 202 and an upper sliding plate 12 and a lower sliding plate 6 that slide with the pressing mold 2, so that when the plate 25 to be pressed generates toxic gas when heated, the toxic gas is sealed in the pressing mold 2 and does not overflow. At the same time, the prismatic groove 202 is provided on the inner wall of the pressing mold 2 and connected to the pressing cavity 201, so that the toxic gas discharged from the pressing gap position of the plate 25 to be pressed is easily collected. In addition, the toxic gas is discharged in a centralized manner in cooperation with the blowing mechanism, the air inlet pipe 8 and the exhaust pipe 13, so that the subsequent treatment of the toxic gas is convenient.

[0025] For details, please refer to Fig.10 The PVC board processing pressing device of the present application comprises the following steps when used: Step 1, unloading: start the lower hydraulic cylinder 7 of the lower pressing mechanism 3, so that the lower hot pressing plate 4 moves to the upper opening position of the pressing mold 2, and then place the plate 25 to be pressed on the lower hot pressing plate 4, and then start the lower hydraulic cylinder 7 again, so that the plate 25 to be pressed moves into the pressing cavity 201 of the pressing mold 2; Step 2, mold closing: start the upper hydraulic cylinder 14 of the upper pressing mechanism 16, so that the upper hot pressing plate 10 moves downward into the pressing mold 2 and the upper sliding plate 12 completely enters the lower pressing mold 2; Step 3, hot pressing and exhausting: synchronously start the lower hydraulic cylinder 7 and the upper hydraulic cylinder 14, start the lower hot pressing plate 4 and the upper hot pressing plate 10 at the same time, and start the blowing mechanism to hot press the plate 25 to be pressed. The blowing mechanism injects external air flow into the pressing mold 2 and removes the toxic gas in the pressing mold 2; Step 4, cooling: when the hot pressing time reaches the set value, close the lower hot pressing plate 4 and the upper hot pressing plate 10, keep the blowing mechanism working, and continuously inject external air into the pressing mold 2 to take away the heat; Step 5, demoulding and discharging: after cooling is completed, close the blowing mechanism, start the upper hydraulic cylinder 14 first, so that the upper hot pressing plate 10 moves to the top of the pressing mold 2, and then start the lower hydraulic cylinder 7, the lower hot pressing plate 4 will push the finished pressed plate out of the pressing mold 2 to realize discharging.

[0026] See also Figure 4 and Figure 5 The pressing mold 2 is a hollow box structure with an open upper end. The pressing cavity 201 and the prismatic groove 202 are vertical concave cavities with rectangular cross-sections. The prismatic protrusions 602 of both the upper sliding plate 12 and the lower sliding plate 6 are rectangular protrusions with rectangular cross-sections. The vertical height of the prismatic groove 202 is equal to the vertical height of the pressing cavity 201.

[0027] Specifically, the upper sliding plate 12 and the lower sliding plate 6 slide along the inner wall of the cavity formed by the pressing cavity 201 and the prismatic groove 202 , and have good sealing performance for the plate 25 to be pressed by heat pressing.

[0028] It should be noted that annular sealing rings distributed along the circumference are fixedly embedded in the circumferential side walls of the upper sliding plate 12 and the lower sliding plate 6 .

[0029] Specifically, by providing annular sealing rings on the circumferential side walls of the upper sliding plate 12 and the lower sliding plate 6 , the sealing effect of the cavity enclosed by the upper sliding plate 12 and the lower sliding plate 6 is further improved.

[0030] See also Figure 4 , the lower fixed column 5 and the upper fixed column 11 are both cylinders.

[0031] Specifically, the lower fixing column 5 is located in the lower horizontal cavity 501, and the upper fixing column 11 is located in the upper horizontal cavity 1101. The influence on the airflow is reduced by arranging the lower fixing column 5 and the upper fixing column 11 in a cylindrical shape.

[0032] In another embodiment of the present invention, based on the above embodiment, please refer to Figure 3 , Figure 8-10 The blowing mechanism includes a heating cylinder 17 fixedly connected to the lower end of the pressing mold 2, the air inlet pipe 8 is fixedly connected to the heating cylinder 17, the heating cylinder 17 is connected to the blower 19 through the first connecting pipe 18, and the air inlet end of the blower 19 is connected to the filter cylinder 20; a first temperature sensor 9 is fixedly connected to the lower sliding plate 6, and the first temperature sensor 9 extends to the cavity between the lower sliding plate 6 and the lower hot pressing plate 4; a second temperature sensor 15 is fixedly connected to the upper sliding plate 12, and the second temperature sensor 15 extends to the cavity between the upper sliding plate 12 and the upper hot pressing plate 10; a heating wire 22 is fixedly connected to the heating cylinder 17.

[0033] Specifically, in the process of hot pressing to discharge toxic gases, the temperature of the external air flow entering the enclosed cavity between the upper sliding plate 12 and the lower sliding plate 6 is monitored by the first temperature sensor 9, and the temperature of the air flow discharged from the enclosed cavity and containing toxic gases is monitored by the second temperature sensor 15; when the temperature of the discharged air flow is lower than the threshold value, the heating wire 22 in the heating cylinder 17 is started to heat the external air flow entering the pressing mold 2, thereby reducing the temperature difference between the external air flow and the pressing plate being hot pressed, maintaining the hot pressing temperature of the pressing plate, and avoiding the heat at the edge of the pressing plate being extracted during the hot pressing process, resulting in poor hot pressing effect at the edge of the pressing plate.

[0034] See also Figure 3 and Fig. 9 A heat exchange cavity 1701 is provided in the shell wall of the heating tube 17 , and the exhaust pipe 13 is connected to the heat exchange cavity 1701 through the second connecting pipe 21 . An end of the heat exchange cavity 1701 away from the second connecting pipe 21 is fixedly connected to an exhaust gas exhaust pipe 23 .

[0035] Specifically, after passing through the compression mold 2, the external airflow takes away the toxic gas, which is a high-temperature gas, and then enters the heat exchange clamp cavity 1701 of the heating tube 17 through the exhaust pipe 13 and the second connecting pipe 21, heating the external airflow flowing through the heating tube 17, reducing the heating power of the heating wire 22, and being more energy-efficient.

[0036] See also Figure 3 and Figure 8 A spiral guide plate 1702 is provided in the heating tube 17, and a spiral cavity for air flow is formed between the spiral guide plate 1702 and the inner wall of the heating tube 17.

[0037] Specifically, after the external airflow enters the heating tube 17 , it flows along the spiral cavity, so that the external airflow fully exchanges heat with the exhaust gas in the heat exchange clamp cavity 1701 .

[0038] See also Figure 3 and Figure 8A gas sensor 24 is fixedly connected to the outlet end of the exhaust pipe 23, and the gas sensor 24 detects the concentration of the toxic gas.

[0039] Specifically, the gas exhausted from the compression mold 2 is detected for toxic gases by means of a gas sensor 24 disposed at the outlet end of the exhaust pipe 23. During demolding and discharging in step five, demolding and discharging operations are performed only after the concentration of toxic gases is lower than a set safety concentration and the temperature drops to a set safety temperature, thereby improving the safety of the compression mold 2 during use.

[0040] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pressing device for PVC board processing, characterized in that: The present invention comprises a platform (1) and a plate to be pressed (25), wherein a pressing mold (2) is fixedly connected to the middle of the platform (1), a lower pressing mechanism (3) is provided in the lower part of the pressing mold (2), and the lower pressing mechanism (3) comprises a lower hot pressing plate (4) slidably connected to the inner wall of the pressing mold (2), a lower sliding plate (6) is fixedly connected to the lower hot pressing plate (4) through a lower fixed column (5), and a lower hydraulic cylinder (7) is fixedly connected to the lower sliding plate (6), and the lower hydraulic cylinder (7) passes through the bottom plate of the pressing mold (2) and is connected to the platform. The pressing die (2) is fixedly connected to the frame (1); an upper pressing mechanism (16) is provided on the upper part of the pressing die (2); the upper pressing mechanism (16) and the lower pressing mechanism (3) have the same structure and are arranged in a mirror image; the upper pressing mechanism (16) comprises an upper hot pressing plate (10) slidably connected to the inner wall of the pressing die (2); the upper hot pressing plate (10) is fixedly connected to an upper sliding plate (12) via an upper fixed column (11); the upper end of the upper sliding plate (12) is fixedly connected to an upper hydraulic cylinder (14) fixedly connected to the frame (1); The pressing mold (2) is provided with a pressing cavity (201) adapted to the plate to be pressed (25); when the plate to be pressed (25) is placed in the pressing cavity (201), its outer walls around it slide against the inner wall of the pressing cavity (201); the inner walls around the pressing cavity (201) are provided with equidistantly distributed prismatic grooves (202); and both the lower sliding plate (6) and the upper sliding plate (12) are provided with prismatic protrusions (602) around them that match the prismatic grooves (202); When both the lower sliding plate (6) and the upper sliding plate (12) are nested in the pressing mold (2), the lower sliding plate (6) and the upper sliding plate (12) are enclosed with the inner wall of the pressing mold (2) to form a closed cavity, the lower sliding plate (6) and the lower hot pressing plate (4) are enclosed with the inner wall of the pressing mold (2) to form a lower horizontal cavity (501), the upper sliding plate (12) and the upper hot pressing plate (10) are enclosed with the inner wall of the pressing mold (2) to form an upper horizontal cavity (1101), and the prismatic groove (202) is located between the lower sliding plate (6) and the upper sliding plate (12) to form a vertical cavity (203) connecting the lower horizontal cavity (501) and the upper horizontal cavity (1101); The lower sliding plate (6) is provided with an air intake passage (601) vertically penetrating the lower sliding plate (6), the lower end of the lower sliding plate (6) is fixedly connected with an air intake pipe (8) in communication with the air intake passage (601), the air intake pipe (8) is in communication with the air blowing mechanism, the upper sliding plate (12) is provided with an exhaust passage (1201) vertically penetrating the upper sliding plate (12), the upper end of the upper sliding plate (12) is fixedly connected with an exhaust pipe (13) in communication with the exhaust passage (1201).

2. A pressing device for PVC board processing according to claim 1, characterized in that: The blowing mechanism comprises a heating cylinder (17) fixedly connected to the lower end of the pressing mold (2), an air inlet pipe (8) fixedly connected to the heating cylinder (17), the heating cylinder (17) connected to the blower (19) via a first connecting pipe (18), and the air inlet end of the blower (19) is connected to a filter cylinder (20); a first temperature sensor (9) is fixedly connected to the lower sliding plate (6), and the first temperature sensor (9) extends into a cavity between the lower sliding plate (6) and the lower hot pressing plate (4); a second temperature sensor (15) is fixedly connected to the upper sliding plate (12), and the second temperature sensor (15) extends into a cavity between the upper sliding plate (12) and the upper hot pressing plate (10); a heating wire (22) is fixedly connected to the heating cylinder (17).

3. A pressing device for PVC board processing according to claim 2, characterized in that: A heat exchange clamp chamber (1701) is provided in the shell wall of the heating cylinder (17); the exhaust pipe (13) is connected to the heat exchange clamp chamber (1701) via a second connecting pipe (21); and one end of the heat exchange clamp chamber (1701) away from the second connecting pipe (21) is fixedly connected to an exhaust gas exhaust pipe (23).

4. A pressing device for PVC board processing according to claim 1, characterized in that: The pressing mold (2) is a hollow box structure with an opening at the top; the pressing cavity (201) and the prismatic groove (202) are vertical concave cavities with rectangular cross-sections; the prismatic protrusions (602) of both the upper sliding plate (12) and the lower sliding plate (6) are rectangular protrusions with rectangular cross-sections; and the vertical height of the prismatic groove (202) is equal to the vertical height of the pressing cavity (201).

5. A pressing device for PVC board processing according to claim 1, characterized in that: Annular sealing rings distributed along the circumference are fixedly embedded in the circumferential side walls of the upper sliding plate (12) and the lower sliding plate (6).

6. A pressing device for PVC board processing according to claim 1, characterized in that: The lower fixed column (5) and the upper fixed column (11) are both cylinders.

7. A pressing device for PVC board processing according to claim 3, characterized in that: The heating cylinder (17) is provided with a spiral guide plate (1702) in it, and a spiral cavity for air flow is formed between the spiral guide plate (1702) and the inner wall of the heating cylinder (17).

8. A pressing device for PVC board processing according to claim 3, characterized in that: A gas sensor (24) is fixedly connected to the outlet end of the exhaust gas exhaust pipe (23), and the gas sensor (24) detects the concentration of the toxic gas.

9. A method for using a pressing device for processing PVC boards, using the pressing device for processing PVC boards as described in claims 1-8, characterized in that: The steps include: Step 1, discharging the material: starting the lower hydraulic cylinder (7) of the lower pressing mechanism (3) so that the lower hot pressing plate (4) moves to the upper opening position of the pressing mold (2), and then placing the plate to be pressed (25) on the lower hot pressing plate (4), and then starting the lower hydraulic cylinder (7) again so that the plate to be pressed (25) moves into the pressing cavity (201) of the pressing mold (2); Step 2, mold closing: start the upper hydraulic cylinder (14) of the upper pressing mechanism (16), so that the upper hot pressing plate (10) moves downward into the pressing mold (2) and the upper sliding plate (12) completely enters the lower pressing mold (2); Step 3, hot pressing and exhausting: synchronously start the lower hydraulic cylinder (7) and the upper hydraulic cylinder (14), simultaneously start the lower hot pressing plate (4) and the upper hot pressing plate (10), and start the air blowing mechanism to hot press the plate to be pressed (25), and the air blowing mechanism injects external air flow into the pressing mold (2) and removes the toxic gas in the pressing mold (2); Step 4, cooling: when the hot pressing time reaches the set value, the lower hot pressing plate (4) and the upper hot pressing plate (10) are closed, the air blowing mechanism is kept working, and the external air flow is continuously injected into the pressing mold (2) to remove the heat; Step 5, demoulding and discharging: after cooling is completed, the air blowing mechanism is turned off, and the upper hydraulic cylinder (14) is first started to move the upper hot pressing plate (10) to the top of the pressing mold (2), and then the lower hydraulic cylinder (7) is started, and the lower hot pressing plate (4) pushes the finished pressed plate out of the pressing mold (2) to achieve discharging.

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