A control system for controlling movement of a hot plate

Abstract

The application provides a control system for controlling the movement of a hot press plate and relates to the technical field of hot press plate control. The oil in the first oil supply device is sequentially caused to flow to the first control port of the control valve, the second control port of the control valve and the third oil port of the hydraulic valve by the controller, the second piston rod of the hydraulic valve is driven to move until the third oil port is communicated with the first oil port, so that the oil flows from the first oil port to the first cavity, the first piston rod is driven to move upward, and the hot press plate is driven to move upward. The application adopts the hydraulic control mode to accurately control the movement stroke of the first piston rod, so that the hot press plate is accurately moved, and the relative position between the hot press plate and the plate is accurately controlled.

Description

Technical Field

[0001] This invention relates to the field of hot press plate control technology, and in particular to a control system for controlling the movement of a hot press plate. Background Technology

[0002] In the conventional melamine-faced engineered wood products industry, when the board is placed in the pressing position of a hot press, the rapid descent and pressure of the hot press platen causes the adhesive to cure and adhere to the board surface under specific temperature and pressure. After pressing, the hot press platen needs to move upwards to a position at a certain height relative to the engineered wood product before the board can be removed from the hot press. During the upward or downward movement of the hot press platen, the positional precision requirements for the hot press are not high; the main concern is avoiding damage to the melamine-impregnated paper during descent, while ensuring the board can be smoothly removed from the hot press during upward movement. However, in actual production, it is difficult to precisely control the movement stroke of the hot press platen, making it challenging to ensure the relative position between the hot press platen and the board. Summary of the Invention

[0003] One object of the present invention is to provide a control system for controlling the movement of a hot press plate, so as to precisely control the moving speed of the hot press plate and its relative position with respect to the sheet material.

[0004] A further objective of this invention is to enhance the functionality of the control system.

[0005] According to the purpose of this invention, a control system for controlling the movement of a hot press plate is provided, comprising:

[0006] Fuel tanks are used to store oil.

[0007] A piston cylinder is arranged vertically. The piston cylinder includes a first housing defining a first cavity and a first piston rod partially disposed in the first cavity. The bottom of the first piston rod is located outside the housing and is connected to a hot press plate. The first cavity is in communication with the oil tank.

[0008] A hydraulic valve includes a second housing defining a second cavity and a second piston rod movably disposed within the second cavity. The second housing has a first oil port, a second oil port, and a third oil port. The first oil port communicates with the first cavity of the piston cylinder, and the second oil port is in a switchable communication with the oil tank.

[0009] The control valve has a first control port and a second control port connected to the third oil port;

[0010] The first oil supply device is connected to the first control port and is used to supply oil to the control valve under controlled conditions.

[0011] A controller is connected to the first oil supply device and the control valve. The controller is configured to control the oil in the first oil supply device to flow sequentially to the first control port, the second control port and the third oil port, drive the second piston rod to move along its extension direction until the third oil port is connected to the first oil port, so that the oil flows from the first oil port into the first cavity, thereby driving the first piston rod to move upward, thereby driving the hot press plate to move upward.

[0012] Optionally, it also includes:

[0013] The first solenoid valve has a third control port communicating with the second oil port and a fourth control port communicating with the first cavity, wherein the third control port and the fourth control port are connected on and off.

[0014] The controller is further configured to control the first oil supply device to stop supplying oil and control the third control port of the first solenoid valve to connect with the fourth control port, so that the oil in the first cavity flows sequentially to the fourth control port, the third control port and the second oil port under the gravity of the hot press plate, thereby driving the second piston rod to move along its extension direction, so that the third oil port is disconnected from the first oil port, thereby keeping the hot press plate stationary.

[0015] Optionally, the hydraulic valve is arranged vertically, and the second piston rod includes a first horizontal part, a vertical part, and a second horizontal part. The first horizontal part and the second horizontal part are respectively disposed at the top and bottom of the vertical part and connected to the vertical part. A first oil chamber communicating with the second oil port is formed between the first horizontal part and the top of the second housing. The second piston rod is configured such that when it moves to the position where the second horizontal part abuts against the side wall of the second housing, the first oil port is disconnected from the third oil port, and when it moves to the position where the second horizontal part is separated from the side wall of the second housing, the first oil port is connected to the third oil port.

[0016] Optionally, the second housing includes a first part and a second part arranged sequentially from top to bottom, the size of the first part being larger than the size of the second part, the first oil cavity being formed between the upper surface of the first horizontal part and the top of the first part, and the second oil cavity being formed between the lower surface of the first horizontal part and the bottom of the first part.

[0017] The second housing also includes a fourth oil port, which is in communication with the second oil cavity.

[0018] Optionally, the control system further includes:

[0019] A second oil supply device is connected to the controller;

[0020] The second solenoid valve has a sixth control port and a seventh control port that can be switched on and off. The sixth control port is connected to the second oil supply device, and the seventh control port is connected to the fourth oil port.

[0021] The controller is further configured to control the oil in the second oil supply device to flow sequentially to the sixth control port, the seventh control port, the fourth oil port and the second oil chamber, so as to drive the second piston rod to move upward until the first oil port and the third oil port are connected, thereby causing the oil in the first chamber to return to the oil tank through the first oil port, the third oil port, the second control port and the fifth control port of the control valve, thereby causing the hot pressure plate to move downward.

[0022] Optionally, the first solenoid valve further includes an eighth control port that can be switched on and off with the third control port, and the eighth control port is connected to the oil tank.

[0023] Optionally, the second solenoid valve further includes a ninth control port that can be switched on and off with the seventh control port, and the ninth control port is connected to the oil tank.

[0024] Optionally, the oil pressure of the second oil supply device is less than or greater than the oil pressure of the first oil supply device, and the second oil supply device is also connected to the fourth control port.

[0025] Optionally, the first piston rod divides the first cavity into an upper cavity and a lower cavity, the upper cavity being connected to the oil tank and the lower cavity being connected to the first oil port.

[0026] Optionally, it also includes:

[0027] A first check valve is disposed between the fourth control port and the first cavity, so that the oil in the first cavity flows unidirectionally to the fourth control port.

[0028] A second one-way valve is provided between the second oil supply device and the fourth control port, so that the oil in the second oil supply device flows unidirectionally to the fourth control port.

[0029] In this invention, the controller can control the oil in the first oil supply device to flow sequentially to the first control port of the control valve, the second control port of the control valve, and the third oil port of the hydraulic valve, driving the second piston rod of the hydraulic valve to move until the third oil port connects with the first oil port, thereby allowing the oil to flow from the first oil port into the first cavity, driving the first piston rod to move upward, thus moving the hot press plate upward. The above technical solution uses a hydraulic control method to precisely control the movement stroke of the first piston rod, thereby driving the hot press plate to move precisely, and accurately controlling the relative position between the hot press plate and the plate.

[0030] Furthermore, in this invention, the controller is also configured to stop the oil supply from the first oil supply device and connect the third and fourth control ports of the first solenoid valve. This causes the oil in the first cavity to flow sequentially to the fourth control port, the third control port, and the second oil port under the gravity of the hot press plate, thereby driving the second piston rod to move and disconnecting the third oil port from the first oil port, thus keeping the hot press plate stationary. The above technical solution achieves the function of keeping the hot press plate stationary by adding only the first solenoid valve, increasing the functionality of the control system, and has a relatively simple structure.

[0031] Furthermore, this invention incorporates a second oil chamber within the hydraulic valve. The controller is also configured to connect the sixth and seventh control ports of the second solenoid valve and control the oil in the second oil supply device to flow sequentially to the sixth, seventh, and fourth control ports, thereby driving the second piston rod upward until the first and third control ports connect. The oil in the first chamber flows sequentially to the first, third, second, and fifth control ports under the gravity of the hot press plate, flowing into the oil tank, thus causing the hot press plate to move downward. This technical solution improves upon the hydraulic valve by adding a second oil chamber, controlling the upward movement of the second piston rod and further controlling the downward movement of the first piston rod. No additional components are needed to lower the hot press plate, resulting in lower costs and a simplified control system structure. The hydraulic valve precisely controls the up-and-down movement of the first piston rod, reducing the complexity of the oil circuit, simplifying the control system's mechanism and flow, increasing the energy supply efficiency of the oil supply device, and improving the stability of the hydraulic connection. This enables precise control of the rising and falling speeds of the hot press plate and the relative position between the hot press plate and the sheet metal.

[0032] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0033] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0034] Figure 1 This is a schematic structural diagram of a control system according to an embodiment of the present invention;

[0035] Figure 2 This is a diagram showing the oil flow direction when the hot platen is raised according to a control system of an embodiment of the present invention;

[0036] Figure 3This is a schematic structural diagram of a piston cylinder in a control system according to an embodiment of the present invention;

[0037] Figure 4 This is a diagram showing the oil flow direction when the hot press plate is kept stationary under the control of a control system according to an embodiment of the present invention.

[0038] Figure 5 This is a schematic structural diagram of a hydraulic valve in a control system according to an embodiment of the present invention;

[0039] Figure 6 According to an embodiment of the present invention, the control system controls the oil flow direction diagram when the hot platen descends.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100 - Control system, 10 - Oil tank, 20 - Piston cylinder, 21 - First housing, 22 - First piston rod, 23 - First cavity, 231 - Upper cavity, 232 - Lower cavity, 30 - Hydraulic valve, 31 - Second cavity, 311 - First part, 312 - Second part, 32 - Second piston rod, 321 - First horizontal part, 322 - Vertical part, 323 - Second horizontal part, 33 - Second housing, 34 - First oil port, 35 - Second oil port, 36 - Third oil port, 37 - Fourth oil port, 331 - First Oil chamber, 332-Second oil chamber, 40-Control valve, 41-First control port, 42-Second control port, 43-Fifth control port, 51-First oil supply device, 52-Second oil supply device, 60-Controller, 70-Hot press plate, 81-First solenoid valve, 811-Third control port, 812-Fourth control port, 813-Eighth control port, 82-Second solenoid valve, 821-Sixth control port, 822-Seventh control port, 823-Ninth control port, 91-First check valve, 92-Second check valve. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically stated, this indicates that other features are not excluded and may be further included.

[0045] Unless otherwise expressly specified and limited, the term "connection" and similar terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Unless otherwise specified, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0047] Figure 1 This is a schematic structural diagram of a control system 100 according to an embodiment of the present invention. Figure 2 This is a diagram showing the oil flow direction when the control system 100 controls the hot press plate 70 to rise according to an embodiment of the present invention, wherein... Figure 2 The middle arrow indicates the direction of oil flow. For example... Figure 1 and Figure 2As shown, the control system 100 includes an oil tank 10, a piston cylinder 20, a hydraulic valve 30, a control valve 40, a first oil supply device 51, and a controller 60. The oil tank 10 stores hydraulic fluid. The piston cylinder 20 is arranged vertically and includes a first housing 21 and a first piston rod 22. The first housing 21 defines a first cavity 23, and the first piston rod 22 is partially disposed within the first cavity 23. The bottom of the first piston rod 22 is located outside the housing and connected to a hot press plate 70. The first cavity 23 communicates with the oil tank 10. The hydraulic valve 30 includes a second housing 33 and a second piston rod 32. The second housing 33 defines a second cavity 31, and the second piston rod 32 is movably disposed within the second cavity 31. The second housing 33 has a first oil port 34, a second oil port 35, and a third oil port 36. The first oil port 34 communicates with the first cavity 23 of the piston cylinder 20, and the second oil port 35 is movably connected to the oil tank 10. The control valve 40 has a first control port 41 and a second control port 42, with the second control port 42 connected to a third oil port 36. A first oil supply device 51 is connected to the first control port 41 and is used to supply oil to the control valve 40 under controlled conditions. A controller 60 is connected to the first oil supply device 51 and the control valve 40. The controller 60 is configured to control the oil in the first oil supply device 51 to flow sequentially to the first control port 41, the second control port 42, and the third oil port 36, driving the second piston rod 32 to move along its extension direction until the third oil port 36 connects with the first oil port 34, thereby allowing the oil to flow from the first oil port 34 into the first cavity 23, driving the first piston rod 22 to move upwards, thereby causing the hot press plate 70 to move upwards. This embodiment uses a hydraulic control method to precisely control the movement stroke of the first piston rod 22, thereby enabling precise movement of the hot press plate 70 to accurately control the relative position between the hot press plate 70 and the plate, preventing damage to the plate.

[0048] In this embodiment, when the controller 60 energizes the control valve 40, the first control port 41 and the second control port 42 of the control valve 40 are connected. Oil from the first oil supply device 51 flows into the control valve 40 from the first control port 41 and into the third oil port 36 from the second control port 42. The second piston rod 32 moves along its extension direction under the oil pressure at the third oil port 36, causing oil in the second chamber 31 to flow from the second oil port 35 to the oil tank 10. The second piston rod 32 continues to move until the first oil port 34 and the third oil port 36 are connected. Oil flows from the third oil port 36 to the first oil port 34 and then enters the first chamber 23 of the piston cylinder 20. The oil pressure in the first chamber 23 increases, causing the first piston rod 22 to move upward, thereby driving the hot press plate 70 to move upward. Furthermore, the control valve 40 can precisely control the oil supply of the first oil supply device 51, thereby precisely controlling the upward movement distance of the hot press plate 70 and its relative position with the plate.

[0049] Figure 3This is a schematic structural diagram of the piston cylinder 20 in a control system 100 according to an embodiment of the present invention. Figure 4 This is a diagram showing the oil flow direction when the hot press plate 70 is kept stationary by the control system 100 according to an embodiment of the present invention, wherein... Figure 4 The middle arrow indicates the direction of oil flow. For example... Figure 3 and Figure 4 As shown, in this embodiment, the first piston rod 22 divides the first cavity 23 into an upper cavity 231 and a lower cavity 232. The upper cavity 231 is connected to the oil tank 10, and the lower cavity 232 is connected to the first oil port 34. When oil flows into the lower cavity 232 from the first oil port 34, the oil pressure in the lower cavity 232 increases, thereby driving the first piston rod 22 to move upward. At this time, the oil in the upper cavity 231 flows back into the oil tank 10 during the movement of the first piston rod 22.

[0050] In this embodiment, the control system 100 further includes a first solenoid valve 81, which has a third control port 811 and a fourth control port 812. The third control port 811 is connected to the second oil port 35, and the fourth control port 812 is connected to the first cavity 23. The third control port 811 and the fourth control port 812 are connected on and off. The controller 60 is also configured to cause the oil in the first cavity 23 to flow sequentially to the fourth control port 812, the third control port 811, and the second oil port 35 under the gravity of the hot press plate 70 when the first oil supply device 51 stops supplying oil, thereby driving the second piston rod 32 to move along its extension direction until the first oil port 34 and the third oil port 36 are disconnected, so that the hot press plate 70 remains stationary. Here, it can be understood that when the controller 60 controls the first oil supply device 51 to stop supplying oil and the control valve 40 is de-energized, the valve core of the control valve 40 returns to the middle position, all the control ports of the control valve 40 are interconnected, and the oil pressure in the control valve 40 is 0. Due to the gravity of the hot press plate 70, the oil in the lower chamber 232 of the piston cylinder 20 generates a first hydraulic pressure. After the first oil supply device 51 is de-energized, the oil in the lower chamber 232 flows sequentially to the fourth control port 812 of the first solenoid valve 81, the third control port 811 of the first solenoid valve 81, and the second oil port 35 of the hydraulic valve 30. Since the pipeline of the control system 100 is closed, the oil pressure at the second oil port 35 is equal to the oil pressure in the lower chamber 232. Under the action of the first hydraulic pressure, the second piston rod 32 is driven to move downward until the first oil port 34 and the third oil port 36 are disconnected, thereby keeping the hot press plate 70 stationary. This embodiment only adds the first solenoid valve 81, thereby enabling the controller 60 to control the hot press plate 70 to remain stationary, increasing the functionality of the control system 100, and the structure is relatively simple.

[0051] Figure 5 This is a schematic structural diagram of the hydraulic valve 30 in a control system 100 according to an embodiment of the present invention. Figure 6 According to one embodiment of the present invention, the control system 100 controls the oil flow direction diagram when the hot platen 70 descends, wherein, Figure 6 The middle arrow indicates the direction of oil flow. For example... Figure 5 and Figure 6 As shown, in this embodiment, the hydraulic valve 30 is arranged vertically, and the second piston rod 32 includes a first horizontal portion 321, a vertical portion 322, and a second horizontal portion 323. The first horizontal portion 321 and the second horizontal portion 323 are respectively disposed at the top and bottom of the vertical portion 322 and connected to the vertical portion 322. The second piston rod 32 is configured such that when it moves to the position where the second horizontal portion 323 abuts against the side wall of the second housing 33, the first oil port 34 and the third oil port 36 are disconnected, and when it moves to the position where the second horizontal portion 323 is separated from the side wall of the second housing 33, the first oil port 34 and the third oil port 36 are connected. Here, it can be understood that when the second piston rod 32 moves upward under oil pressure until the second horizontal portion 323 separates from the second housing 33, the first oil port 34 and the third oil port 36 are connected, and the oil pressure at the first oil port 34 is equal to the oil pressure at the third oil port 36; when the second piston rod 32 moves downward under oil pressure until the second horizontal portion 323 abuts against the second housing 33, the first oil port 34 and the third oil port 36 are disconnected, and the two oil ports are not connected. In another embodiment, the hydraulic valve 30 can also be arranged horizontally, and the second piston rod 32 can also be arranged horizontally.

[0052] In this embodiment, the second housing 33 includes a first portion 311 and a second portion 312 arranged sequentially from top to bottom. The size of the first portion 311 is larger than the size of the second portion 312. A first oil cavity 331 is formed between the upper surface of the first horizontal portion 321 and the top of the first portion 311, and a second oil cavity 332 is formed between the lower surface of the first horizontal portion 321 and the bottom of the first portion 311. The second housing 33 also has a fourth oil port 37 communicating with the second oil cavity 332. Here, a spring is connected between the upper surface of the first horizontal portion 321 and the top of the first portion 311. This embodiment cleverly designs and utilizes the oil pressure in the second oil chamber 332 to directly control the movement of the second piston rod 32, thereby achieving the purpose of opening and closing the first oil port 34 and the third oil port 36. When the second piston rod 32 moves upward under the action of the oil pressure in the second oil chamber 332, the oil in the first cavity 23 can flow to the oil tank 10 through the first oil port 34 and the third oil port 36. The second piston rod 32 moves upward under the action of the oil pressure in the second oil chamber 332 until the second horizontal part 323 separates from the second housing 33. The third oil port 36 connects with the first oil port 34, and the oil in the first cavity 23 enters the oil tank 10 from the third oil port 36, thus simplifying the control system 100 and making the control relatively simple.

[0053] In this embodiment, the control valve 40 further includes a fifth control port 43 communicating with the oil tank 10, and the control system 100 further includes a second oil supply device 52 and a second solenoid valve 82. The second solenoid valve 82 has a sixth control port 821 communicating with the second oil supply device 52 and a seventh control port 822 communicating with the fourth oil port 37. The controller 60 is also configured to cause the oil in the second oil supply device 52 to flow sequentially to the sixth control port 821, the seventh control port 822, the fourth oil port 37 and the second oil chamber 332 when controlling the second oil supply device 52 to supply oil, so as to drive the second piston rod 32 to move upward to the position where the first oil port 34 and the third oil port 36 are disconnected, so that the oil in the first chamber 23 flows sequentially to the first oil port 34, the third oil port 36, the second control port 42, the fifth control port 43 and the oil tank 10, thereby causing the first piston rod 22 to drive the hot pressure plate 70 to move downward. Here, it can be understood that when the controller 60 controls the oil in the second oil supply device 52 to flow sequentially to the sixth control port 821, the seventh control port 822, and the fourth oil port 37 to enter the second oil chamber 332, the oil pressure in the second oil chamber 332 causes the second piston rod 32 to move upward. When the second piston rod 32 moves to the point where the second horizontal part 323 separates from the second housing 33, the first oil port 34 and the third oil port 36 are connected. The oil pressure in the first chamber 23 is greater than the oil pressure in the second chamber 31. Under the action of the pressure difference, the oil in the first chamber 23 flows to the first oil port 34 and enters the hydraulic valve 30, flows from the third oil port 36 to the second control port 42 and enters the control valve 40, and enters the oil tank 10 from the fifth control port 43. As a result, the oil pressure in the lower chamber 232 decreases. When the oil pressure in the lower chamber 232 decreases to less than the weight of the hot plate 70, the first piston rod 22 is driven to move the hot plate 70 downward. Furthermore, the control valve 40 can precisely control the outflow of oil in the first chamber 23, thereby precisely controlling the downward movement distance of the hot press plate 70 and its relative position with the plate. This embodiment only improves the hydraulic valve 30 by adding a second oil chamber 332, which controls the rise of the second piston rod 32 and further controls the descent of the first piston rod 22. No other components are needed to achieve the descent of the hot press plate 70, so the cost is lower and the structure of the control system 100 is simplified. The control valve 40 precisely controls the up and down movement of the first piston rod 22, reducing the complexity of the oil circuit, simplifying the mechanism and control process of the control system 100, making the energy supply efficiency of the oil supply device higher, and improving the stability of the hydraulic connection, thus achieving precise control of the rising and falling speeds of the hot press plate 70 and the relative position between the hot press plate 70 and the plate.

[0054] In this embodiment, the first solenoid valve 81 further includes an eighth control port 813 that can be switched on and off with the third control port 811. The eighth control port 813 is connected to the oil tank 10. When the hot press plate 70 is in a stationary state, the third control port 811 is connected to the fourth control port 812. At this time, the oil at the second oil port 35 cannot flow to the oil tank 10 through the first solenoid valve 81, that is, the second oil port 35 is not connected to the oil tank 10. When the hot press plate 70 is controlled to move upward or downward, the third control port 811 is connected to the eighth control port 813. The oil in the first oil chamber 331 flows sequentially to the second oil port 35, the third control port 811, and the eighth control port 813 before flowing into the oil tank 10.

[0055] In this embodiment, the second solenoid valve 82 further includes a ninth control port 823 that is connectable to and disconnectable from the seventh control port 822. The ninth control port 823 is connected to the oil tank 10. When the hot platen 70 is in a stationary state, the seventh control port 822 is connected to the ninth control port 823, and the oil at the fourth oil port 37 can flow to the oil tank 10 through the second solenoid valve 82, i.e., the fourth oil port 37 is connected to the oil tank 10. When the hot platen 70 is controlled to move upward, the seventh control port 822 is connected to the ninth control port 823, and the oil in the first oil chamber 331 flows sequentially to the second oil port 35, the third control port 811, the eighth control port 813, the ninth control port 823, the seventh control port 822, and the fourth oil port 37 before flowing into the second oil chamber 332. When the hot platen 70 is controlled to move downward, the seventh control port 822 is connected to the sixth control port 821.

[0056] The control system 100 also includes a first check valve 91 and a second check valve 92. The first check valve 91 is disposed between the fourth control port 812 and the first chamber 23, so that the oil in the first chamber 23 flows unidirectionally to the fourth control port 812. The second check valve 92 is disposed between the second oil supply device 52 and the fourth control port 812, so that the oil in the second oil supply device 52 flows unidirectionally to the fourth control port 812. The oil inlet of the first check valve 91 is connected to the lower chamber 232 of the piston cylinder 20, and the oil inlet of the second check valve 92 is connected to the second oil supply device 52. The oil outlet of the first check valve 91 is connected to the oil outlet of the second check valve 92, and the oil outlets of the first check valve 91 and the second check valve 92 are connected together to the fourth control port 812 of the first solenoid valve 81 through a pipeline.

[0057] In this embodiment, the oil pressure of the second oil supply device 52 is less than or greater than the oil pressure of the lower cavity 232 of the piston cylinder 20. The second oil supply device 52 is also connected to the fourth control port 812. When the hot press plate 70 remains stationary, the controller 60 controls the first oil supply device 51 to stop supplying oil. The oil pressure in the first cavity 23 is equal to the oil pressure of the first oil supply device 51. Due to the weight of the hot press plate 70, the oil in the first cavity 23 flows sequentially to the fourth control port 812, the third control port 811, and the second oil port 35 into the first oil cavity 331. That is, the oil pressure in the first oil cavity 331 is equal to the oil pressure in the lower cavity 232 of the piston cylinder 20. The oil pressure in the second oil cavity 332 is connected to the oil tank 10 through the fourth oil port 37, the seventh control port 822, and the ninth control port 823. Therefore, the pressure in the second oil cavity 332 is 0. If the oil pressure of the second oil supply device 52 is less than the oil pressure of the lower chamber 232 of the piston cylinder 20, the oil in the lower chamber 232 flows through the first check valve 91 to the fourth control port 812. Since the oil outlet of the second check valve 92 is connected to the fourth control port 812, the pressure at the oil outlet of the second check valve 92 is equal to the pressure in the lower chamber 232 of the piston cylinder 20. However, the pressure in the lower chamber 232 is greater than the pressure of the second oil supply device 52, so the second check valve 92 closes. At this time, the oil in the lower chamber 232 flows through the fourth control port 812 and the third control port 811 to the second oil port 35. When the second piston rod moves downward to the second horizontal part 323 and abuts against the second housing 33, the first oil port 34 and the third oil port 36 disconnect, and the hot pressure plate 70 remains stationary. If the oil pressure of the second oil supply device 52 is greater than the oil pressure of the lower chamber 232 of the piston cylinder 20, the oil from the second oil supply device 52 flows through the second check valve 92 to the fourth control port 812. Since the oil outlet of the first check valve 91 is also connected to the fourth control port 812, the pressure at the oil outlet of the first check valve 91 is greater than the pressure at the oil inlet, so the first check valve 91 remains closed. At this time, the oil from the fourth control port 812 flows through the third control port 811 to the second oil port 35. When the second piston rod 32 moves downward to the second horizontal part 323 abutting against the second housing 33, the first oil port 34 and the third oil port 36 are disconnected, and the hot pressure plate 70 remains stationary. In this embodiment, by adding a first check valve 91 and a second check valve 92, the first oil port 34 and the third oil port 36 can be reliably disconnected regardless of whether the oil pressure of the second oil supply device 52 is less than or greater than the oil pressure of the lower cavity 232, thus keeping the hot pressure plate 70 stationary. This increases the functionality of the control system 100 and has a relatively simple structure.

[0058] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A control system for controlling the movement of a hot press plate, characterized in that, include: Fuel tanks are used to store oil. A piston cylinder is arranged vertically. The piston cylinder includes a first housing defining a first cavity and a first piston rod partially disposed in the first cavity. The bottom of the first piston rod is located outside the first housing and is connected to a hot press plate. The first cavity is in communication with the oil tank. A hydraulic valve includes a second housing defining a second cavity and a second piston rod movably disposed within the second cavity. The second housing has a first oil port, a second oil port, and a third oil port. The first oil port communicates with the first cavity of the piston cylinder, and the second oil port is in a switchable communication with an oil tank. The second piston rod includes a first transverse portion. The second housing includes a first portion. A second oil cavity is formed between the lower surface of the first transverse portion and the bottom of the first portion. The second housing also includes a fourth oil port communicating with the second oil cavity. The control valve has a first control port and a second control port connected to the third oil port; The first oil supply device is connected to the first control port and is used to supply oil to the control valve under controlled conditions. A controller is connected to the first oil supply device and the control valve. The controller is configured to control the oil in the first oil supply device to flow sequentially to the first control port, the second control port and the third oil port, drive the second piston rod to move along its extension direction until the third oil port is connected to the first oil port, so that the oil flows from the first oil port into the first cavity, thereby driving the first piston rod to move upward, thereby driving the hot press plate to move upward. The control valve also includes a fifth control port that communicates with the oil tank; The control system further includes: A second oil supply device is connected to the controller; The second solenoid valve has a sixth control port and a seventh control port that can be switched on and off. The sixth control port is connected to the second oil supply device, and the seventh control port is connected to the fourth oil port. The controller is further configured to control the oil in the second oil supply device to flow sequentially to the sixth control port, the seventh control port, the fourth oil port and the second oil chamber, so as to drive the second piston rod to move upward until the first oil port and the third oil port are connected, thereby causing the oil in the first chamber to return to the oil tank through the first oil port, the third oil port, the second control port and the fifth control port of the control valve, thereby causing the hot pressure plate to move downward.

2. The control system according to claim 1, characterized in that, Also includes: The first solenoid valve has a third control port communicating with the second oil port and a fourth control port communicating with the first cavity, wherein the third control port and the fourth control port are connected on and off. The controller is further configured to control the first oil supply device to stop supplying oil and control the third control port of the first solenoid valve to connect with the fourth control port, so that the oil in the first cavity flows through the gravity of the hot press plate to the fourth control port, the third control port and the second oil port, thereby driving the second piston rod to move along its extension direction, so that the third oil port is disconnected from the first oil port, thereby keeping the hot press plate stationary.

3. The control system according to claim 2, characterized in that, The hydraulic valve is arranged vertically. The second piston rod further includes a vertical part and a second horizontal part. The first horizontal part and the second horizontal part are respectively disposed at the top and bottom of the vertical part and connected to the vertical part. A first oil chamber communicating with the second oil port is formed between the first horizontal part and the top of the second housing. The second piston rod is configured such that when it moves to the position where the second horizontal part abuts against the side wall of the second housing, the first oil port is disconnected from the third oil port, and when it moves to the position where the second horizontal part is separated from the side wall of the second housing, the first oil port is connected to the third oil port.

4. The control system according to claim 3, characterized in that, The second housing also includes a second portion arranged from top to bottom below the first portion, the first portion being larger in size than the second portion, and the first oil cavity being formed between the upper surface of the first horizontal portion and the top of the first portion.

5. The control system according to any one of claims 2-4, characterized in that, The first solenoid valve also includes an eighth control port that can be switched on and off with the third control port, and the eighth control port is connected to the oil tank.

6. The control system according to claim 4, characterized in that, The second solenoid valve also includes a ninth control port that can be switched on and off with the seventh control port, and the ninth control port is connected to the oil tank.

7. The control system according to claim 4, characterized in that, The oil pressure of the second oil supply device is less than or greater than that of the first oil supply device, and the second oil supply device is also connected to the fourth control port.

8. The control system according to any one of claims 2-4, characterized in that, The first piston rod divides the first cavity into an upper cavity and a lower cavity. The upper cavity is connected to the oil tank, and the lower cavity is connected to the first oil port.

9. The control system according to claim 4, characterized in that, Also includes: A first check valve is disposed between the fourth control port and the first cavity, so that the oil in the first cavity flows unidirectionally to the fourth control port. A second one-way valve is provided between the second oil supply device and the fourth control port, so that the oil in the second oil supply device flows unidirectionally to the fourth control port.

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