Hydraulic control system for synchronous opening and closing plates of filter press

Abstract

The utility model belongs to the technical field of filter presses, and particularly relates to a hydraulic control system for synchronous opening and closing plates of a filter press, which comprises a controller, an electromagnetic reversing valve, one-way throttle valves and two electric proportional valves, and the left side and the right side of the electromagnetic reversing valve are respectively communicated with the two one-way throttle valves through two hydraulic pipelines. Wherein one one-way throttle valve is communicated with the two electric proportional valves through hydraulic pipelines, the two electric proportional valves are respectively communicated with one ends of the two opening and closing plate oil cylinders through hydraulic pipelines, the other one-way throttle valve is communicated with the other ends of the two opening and closing plate oil cylinders through hydraulic pipelines, and displacement sensors are arranged on the opening and closing plate oil cylinders. The two displacement sensors and the two electric proportional valves are all electrically connected with the controller. According to the utility model, the problems of offset and derailing of the filter plate caused by poor synchronism of the opening and closing plate oil cylinders when the filter press opens and closes the plate can be solved.

Description

Technical Field

[0001] This utility model belongs to the field of filter press technology, specifically relating to a hydraulic control system for synchronous opening and closing plates of a filter press. Background Technology

[0002] A filter press is an intermittent solid-liquid separation device. It relies on a clamping device to press filter plates together, then pumps slurry into the filter chamber, separating solid particles from the liquid through filter cloth. It remains widely used in industries such as chemical, pharmaceutical, metallurgical, dye, food, and brewing. The opening and closing of the filter plates is a crucial process in the filter press's operating cycle, and its efficiency directly affects the overall efficiency of the filter press. Therefore, the efficiency of the opening and closing plates is a key technical indicator for filter presses. Synchronous opening and closing of the filter plates is an important measure to improve filter press efficiency. The smoothness and precision of the filter plate movement during synchronous opening and closing are technical indicators that must be considered in the design of the hydraulic system.

[0003] A filter press mainly consists of a frame, crossbeams, filter plates, and filter cloth. The filter plates move on the crossbeams, opening and closing them. The movement of the filter plates must ensure that their planes are perpendicular to the crossbeams, without tilting or shifting. If tilting or shifting occurs, the filter plates may derail, leading to equipment failure. For filter presses where the filter plates are opened and closed by side-end hydraulic cylinders, the synchronization of the cylinder movements is crucial. The overall structure of the filter press is as follows: Figure 1 As shown.

[0004] Currently, the hydraulic control system of the filter press, which uses a side-end cylinder to drive the opening and closing of the filter plates, is as follows: Figure 2 As shown, the open-loop control system is adopted, and the hydraulic system only has a flow divider valve design, which cannot accurately control the movement displacement of the left and right cylinders, resulting in frequent filter plate offset and derailment problems during the filter plate movement.

[0005] Based on the working characteristics of the opening and closing plate movement of a filter press, this invention provides a hydraulic control system for the opening and closing plate of a side-end cylinder, realizing closed-loop control of the hydraulic system, accurately controlling the movement displacement of the cylinders on both sides, ensuring that the filter plate remains perpendicular to the crossbeam during movement, and solving the problems of filter plate offset and derailment. Utility Model Content

[0006] The purpose of this invention is to provide a hydraulic control system for synchronous opening and closing of filter press plates, which can solve the problem of filter plates shifting or derailing due to poor synchronization of the opening and closing cylinders when the filter press plates are opening and closing.

[0007] The specific technical solution adopted by this utility model is as follows:

[0008] A hydraulic control system for synchronous opening and closing plates of a filter press includes a controller, an electromagnetic directional valve, a one-way throttle valve, and two electro-proportional valves. The left and right sides of the electromagnetic directional valve are connected to the two one-way throttle valves through two hydraulic lines, one of the one-way throttle valves is connected to the two electro-proportional valves through a hydraulic line, the two electro-proportional valves are connected to one end of two opening and closing plate cylinders through hydraulic lines, and the other one-way throttle valve is connected to the other end of the two opening and closing plate cylinders through a hydraulic line.

[0009] The opening and closing plate cylinder is equipped with a displacement sensor, and the two displacement sensors and the two electro-proportional valves are all electrically connected to the controller.

[0010] Furthermore, the opening and closing plate cylinder includes a cylinder body, a guide sleeve is fixedly connected to the other end of the cylinder body, a piston rod is slidably connected inside the guide sleeve, a piston plate is fixedly connected to the outer side of the piston rod located inside the cylinder body, and two oil ports located on both sides of the piston plate are fixedly connected to the outer side of the cylinder body. The two oil ports are respectively connected to a hydraulic pipeline and an electro-proportional valve and a one-way throttle valve.

[0011] Furthermore, the displacement sensor includes an electronic box fixedly connected to the outside of the cylinder body and a sensor electronic compartment fixedly connected to the inside of the cylinder body.

[0012] The electronic box is electrically connected to the controller via a connector socket, and the electronic box is electrically connected to the sensor electronic compartment via internal wiring;

[0013] One end of the sensor electronic chamber is fixedly connected to the sensor outer tube. The piston rod body has an inner cavity, and the sensor outer tube extends into the inner cavity. One end of the piston rod body is fixedly connected to a permanent magnet ring that is slidably connected to the outside of the sensor outer tube.

[0014] Furthermore, the sensor electronic compartment is fixedly connected to the inside of the cylinder body by a flexible pin.

[0015] Furthermore, a cylinder head is fixedly connected to one end of the cylinder body, and a self-lubricating bearing is fixedly connected inside the cylinder head.

[0016] Furthermore, a first annular groove is formed on the circumferential side of the piston plate, and a magnet ring is fixedly connected inside the first annular groove. A second annular groove is formed on the inner wall of the cylinder body between the two oil ports, and an electromagnetic ring electrically connected to the controller is fixedly connected inside the second annular groove. When the electromagnetic ring is energized, it magnetically attracts the magnet ring.

[0017] The technical effects achieved by this utility model are as follows:

[0018] This utility model discloses a hydraulic control system for synchronous opening and closing plates of a filter press. By adopting a closed-loop control system, it can detect the difference in displacement of the cylinders on both sides of the filter press in real time when the filter plates are opening and closing. By comparing the difference, the hydraulic flow of the cylinders on the left and right sides of the filter press is controlled to ensure the synchronicity of movement. This solves the problem of filter plate displacement and derailment caused by poor synchronicity of the cylinders when the filter press is opening and closing. It also solves the problem that open-loop control systems cannot dynamically monitor and correct the displacement of the cylinders. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 It is the hydraulic control circuit of the filter press in the existing technology;

[0021] Figure 3 This is the hydraulic control circuit of the filter press in Embodiment 2 of this utility model;

[0022] Figure 4 This is a schematic diagram of the opening and closing plate hydraulic cylinder in Embodiment 2 of this utility model;

[0023] Figure 5 This is a cross-sectional structural diagram of the opening and closing plate hydraulic cylinder in Embodiment 2 of this utility model;

[0024] Figure 6 This is a diagram of the hydraulic control system for the synchronous opening and closing plate of the filter press in Embodiment 2 of this utility model;

[0025] Figure 7 This is a side view of the cross-sectional structure of the opening and closing plate cylinder in Embodiment 3 of this utility model.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Filter press crossbeam; 2. Filter plate; 3. Opening and closing plate cylinder; 4. Solenoid directional valve; 5. One-way throttle valve; 6. Diverter and combiner valve; 7. Solenoid coil; 8. Electro-proportional valve; 9. Cylinder body; 10. Sensor electronic compartment; 11. Plug; 12. Cylinder end; 13. Self-lubricating bearing; 14. Oil port; 15. Piston plate; 16. Piston rod; 17. Guide sleeve; 18. Sensor outer tube; 19. Inner cavity; 20. Permanent magnet ring; 21. Electronic box; 22. Connector socket; 23. Magnet ring. Detailed Implementation

[0028] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0029] like Figure 1 As shown, a hydraulic control system for synchronous opening and closing plates of a filter press includes a filter press beam 1, on which several horizontally sliding filter plates 2 are installed. On both the left and right sides of the filter press beam 1, there are opening and closing plate cylinders 3 that are connected to the filter plates 2. The two opening and closing plate cylinders 3 are connected to the same hydraulic control circuit. By starting the two opening and closing plate cylinders 3 on the left and right sides through the hydraulic control circuit, the filter plates 2 can be synchronously driven to open and close.

[0030] Example 1:

[0031] This embodiment discloses a hydraulic control circuit in the prior art, as detailed below. Figures 1-2 As shown, the hydraulic control circuit in the prior art includes an electromagnetic directional valve 4. Both sides of the electromagnetic directional valve 4 are connected to one-way throttle valves 5 through hydraulic lines. Both one-way throttle valves 5 are connected to flow divider and combiner valves 6 through hydraulic lines. Both flow divider and combiner valves 6 are connected to two opening and closing plate cylinders 3 through two hydraulic lines, and the two flow divider and combiner valves 6 are respectively connected to both ends of the opening and closing plate cylinders 3.

[0032] The solenoid directional valve 4 controls the valve core direction by switching the electromagnets on both sides. Pressure oil from the hydraulic pump station enters the opening / closing plate cylinder 3 through the solenoid directional valve 4, enabling the piston rod of the opening / closing plate cylinder 3 to extend and retract. The one-way throttle valve 5 adjusts the hydraulic flow, controlling the speed of the opening / closing plate cylinder 3. The flow divider / combiner valve 6 distributes the oil volume to ensure equal oil flow into both opening / closing plate cylinders 3, achieving synchronization of their movement. However, during actual operation, the two cylinders move asynchronously, causing the filter plate 2 to shift and derail. Because the internal leakage and frictional resistance of the two opening / closing plate cylinders 3 are not perfectly consistent, the flow divider / combiner valve 6 alone cannot effectively control the synchronization of their movement. Furthermore, this hydraulic circuit is an open-loop control, making it impossible to detect and adjust the displacement of the two cylinders in real time.

[0033] Example 2:

[0034] like Figure 1 and Figures 3-6 As shown, the hydraulic control circuit of this application includes a solenoid directional valve 4 and a one-way throttle valve 5. Unlike the prior art in the embodiments, the hydraulic control system for the synchronous opening and closing plate of the filter press also includes two electro-proportional valves 8, such as... Figure 3 As shown, the left and right sides of the electromagnetic directional valve 4 are connected to two hydraulic lines and two one-way throttle valves 5 respectively. One of the one-way throttle valves 5 is connected to two electro-proportional valves 8 through a hydraulic line. The two electro-proportional valves 8 are connected to one end of two opening and closing plate cylinders 3 through hydraulic lines respectively. The other one-way throttle valve 5 is connected to the other end of two opening and closing plate cylinders 3 through a hydraulic line.

[0035] During the extension and retraction of the two opening and closing plate cylinders 3, if the displacement difference between the two opening and closing plate cylinders 3 is greater than the set value, the electric proportional valve 8 adjusts the oil inlet ratio of the two opening and closing plate cylinders 3, thereby adjusting the speed of the extension and retraction of the two opening and closing plate cylinders 3, so that the extension and retraction of the two opening and closing plate cylinders 3 are consistent.

[0036] During the extension and retraction of the two opening and closing plate cylinders 3, if the displacement difference between the two opening and closing plate cylinders 3 is less than the set value, the valve port of the electro-proportional valve 8 will not be adjusted, and oil will continue to be supplied to the opening and closing plate cylinders 3 according to the current opening degree. The closed-loop control of the cylinder movement is realized through the above logic control.

[0037] Specifically, Figures 3-4 As shown, the hydraulic control system for synchronous opening and closing plates of the filter press also includes a controller. A displacement sensor is installed on the opening and closing plate cylinder 3 to collect the displacement distance of the piston rod of the opening and closing plate cylinder 3. The opening and closing plate cylinder 3 with built-in displacement sensor realizes real-time detection of the movement displacement of the left and right opening and closing plate cylinders 3.

[0038] Two displacement sensors and two electro-proportional valves 8 are electrically connected to the controller. The electro-proportional valves 8 are used to adjust the valve opening and control the oil intake of the left and right opening and closing plate cylinders 3. The controller dynamically adjusts the valve opening of the electro-proportional valves 8 according to the feedback signal of the displacement sensors.

[0039] The pressure oil from the hydraulic pump station reverses the valve core by switching the electromagnets on both sides of the solenoid directional valve 4, thus extending and retracting the piston rod of the opening and closing plate cylinder 3. The one-way throttle valve 5 adjusts the oil flow to control the speed of the opening and closing plate cylinder 3. The electro-proportional valve 8 receives signals from the controller and adjusts the valve opening in real time to match the oil intake of the opening and closing plate cylinder 3, thereby achieving synchronization of the movement of the opening and closing plate cylinder 3. The opening and closing plate cylinder 3, as a power actuator, pushes the filter plate 2 to move on the guide rail. The opening and closing plate cylinder 3 has a built-in displacement sensor that can transmit displacement detection information. The signal is transmitted to the controller; the controller analyzes and calculates the displacement detection signal of the displacement sensor inside the opening and closing plate cylinder 3. If the displacement difference between the left and right opening and closing plate cylinders 3 is greater than the set value, the controller sends a signal to the electro-proportional valve 8 to adjust the valve ports of the two electro-proportional valves 8 so that the movement displacement of the left and right opening and closing plate cylinders 3 is consistent; if the displacement difference between the left and right opening and closing plate cylinders 3 is less than the set value, the valve ports of the electro-proportional valve 8 are not adjusted, and oil is continued to be supplied to the opening and closing plate cylinders 3 according to the current opening degree. The closed-loop control of the movement of the opening and closing plate cylinder 3 is realized through the above logic control.

[0040] The opening and closing plate cylinder 3 includes a cylinder body 9, one end of which is rotatably connected to the filter press crossbeam 1. The connection method can be as follows: Figure 1 and Figure 4As shown, a cylinder head 12 is fixedly connected to one end of the cylinder body 9. A self-lubricating bearing 13 is fixedly connected inside the cylinder head 12. The cylinder head 12 is rotatably connected to the filter press beam 1 through the self-lubricating bearing 13, so that the cylinder body 9 can rotate on the filter press beam 1. A screw plug 11 is installed on the cylinder head 12.

[0041] A guide sleeve 17 is fixedly connected to the other end of the cylinder body 9. A piston rod 16 is slidably connected inside the guide sleeve 17. The end of the piston rod 16 is connected to the filter plate 2. When the piston rod 16 extends or retracts, it can drive the filter plate 2 to open and close. A piston plate 15 is fixedly connected to the outer side of one end of the piston rod 16 inside the cylinder body 9. A displacement sensor is used to monitor the displacement of the piston rod 16. Two oil ports 14 are fixedly connected to the outer side of the cylinder body 9, located on both sides of the piston plate 15. The two oil ports 14 are connected to the hydraulic pipeline and the electro-proportional valve 8 and the one-way throttle valve 5, respectively.

[0042] The displacement detection of the opening and closing plate hydraulic cylinder 3 adopts the principle of magnetostrictive displacement sensor, specifically as follows: Figures 4-5 As shown, the displacement sensor includes an electronic box 21 fixedly connected to the outside of the cylinder body 9 and a sensor electronic chamber 10 fixedly connected to the inside of the cylinder body 9. The sensor electronic chamber 10 can be fixedly connected to the inside of the cylinder body 9 by an elastic pin.

[0043] The electronic box 21 is electrically connected to the controller via the connector socket 22. The electronic box 21 is also electrically connected to the sensor electronic compartment 10 via internal wiring, which consists of cables installed inside the cylinder body 9.

[0044] One end of the sensor electronic chamber 10 is fixedly connected to a sensor outer tube 18. An inner cavity 19 is formed inside the piston rod 16, and the sensor outer tube 18 extends into the inner cavity 19. One end of the piston rod 16 is fixedly connected to a permanent magnet ring 20 that is slidably connected to the outside of the sensor outer tube 18. When the piston rod 16 moves, it drives the permanent magnet ring 20 to move synchronously, causing the permanent magnet ring 20 to move outside the sensor outer tube 18. Figure 4 As shown, when high-pressure oil enters from the left oil port 14, it pushes the piston plate 15 to move to the right, which in turn drives the permanent magnet ring 20 to move along the sensor outer tube 18. This allows the position data of the piston rod 16 at that time to be calculated, converted into a digital signal by the electronic box 21, and sent to the controller through the connector socket 22. This hydraulic control circuit uses electrical control technology and sensor recognition technology to realize the automatic control of the synchronous movement of the opening and closing plate cylinder 3, solve the problem of derailment during the movement of the filter plate 2, and improve the working efficiency of the filter press.

[0045] In summary, this technical solution employs a closed-loop control system, which can detect the displacement difference of the two opening and closing plate cylinders 3 in real time when the filter plate 2 is opened and closed. By comparing the difference, the hydraulic flow of the left and right opening and closing plate cylinders 3 is controlled to ensure the synchronization of movement. This solves the problem of filter plate 2 shifting or derailing due to poor synchronization of the opening and closing plate cylinders 3 when the filter press is opening and closing. It also solves the problem that the open-loop control system cannot dynamically monitor and correct the movement displacement of the opening and closing plate cylinders 3.

[0046] Example 3:

[0047] like Figure 7 As shown, the difference between this embodiment and Embodiment 2 is that the piston plate 15 has a first annular groove on its circumferential side, and a magnet ring 23 is fixedly connected inside the first annular groove. The cylinder body 9 has a second annular groove on its inner wall between the two oil ports 14, and an electromagnetic coil 7 electrically connected to the controller is fixedly connected inside the second annular groove. When the electromagnetic coil 7 is energized, it and the magnet ring 23 magnetically attract each other. By adjusting the magnetic force between the electromagnetic coil 7 and the magnet ring 23, the friction between the piston plate 15 and the cylinder body 9 is adjusted, and the movement of the piston rod 16 is controlled, thereby adjusting the synchronicity of the movement of the two piston rods 16.

[0048] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A hydraulic control system for the synchronized opening and closing of plates in a filter press, characterized by: The utility model relates to a filter plate opening and closing device, including filter press beam (1), a plurality of horizontal sliding filter plate (2) are installed on filter press beam (1), the left and right sides of filter press beam (1) are all installed with and a plurality of filter plate (2) transmission connection's open and close board oil cylinder (3), two open and close board oil cylinder (3) are communicated with same hydraulic control circuit, The hydraulic control circuit includes a controller, an electromagnetic reversing valve (4), a one-way throttle valve (5), two electric proportional valves (8), the left and right sides of the electromagnetic reversing valve (4) are communicated through two hydraulic pipelines and two one-way throttle valves (5) respectively, one of the one-way throttle valves (5) is communicated through a hydraulic pipeline and two electric proportional valves (8), the two electric proportional valves (8) are communicated through a hydraulic pipeline and one end of the two open and close board oil cylinders (3) respectively, the other one-way throttle valve (5) is communicated through a hydraulic pipeline and the other end of the two open and close board oil cylinders (3). The open and close board oil cylinder (3) is provided with a displacement sensor, and the two displacement sensors and the two electric proportional valves (8) are electrically connected with the controller.

2. The hydraulic control system for the synchronous opening and closing of the plates of a filter press according to claim 1, characterized in that: The open and close board oil cylinder (3) includes a cylinder body (9), the other end of the cylinder body (9) is fixedly connected with a guide sleeve (17), the inside of the guide sleeve (17) is slidably connected with a piston rod body (16), the outside of one end of the piston rod body (16) in the cylinder body (9) is fixedly connected with a piston sheet (15), the outside of the cylinder body (9) is fixedly connected with two oil ports (14) located on the two sides of the piston sheet (15) respectively, the two oil ports (14) are communicated through hydraulic pipelines, electric proportional valves (8) and one-way throttle valves (5) respectively.

3. The hydraulic control system for the synchronous opening and closing of the plates of a filter press according to claim 2, characterized in that: The displacement sensor includes an electronic box (21) fixedly connected to the outside of the cylinder body (9) and a sensor electronic chamber (10) fixedly connected to the inside of the cylinder body (9). The electronic box (21) is electrically connected with the controller through a connector socket (22), and the electronic box (21) is electrically connected with the sensor electronic chamber (10) through internal wires. One end of the sensor electronic chamber (10) is fixedly connected with a sensor outer tube (18), an inner cavity (19) is formed in the inside of the piston rod body (16), the sensor outer tube (18) extends into the inner cavity (19), and one end of the piston rod body (16) is fixedly connected with a permanent magnet ring (20) slidably connected to the outside of the sensor outer tube (18).

4. The hydraulic control system for the synchronous opening and closing of the plates of a filter press according to claim 3, characterized in that: The sensor electronic chamber (10) is fixedly connected to the inside of the cylinder body (9) through an elastic column pin.

5. The hydraulic control system for the synchronous opening and closing plate of a filter press according to claim 3, characterized in that: One end of the cylinder body (9) is fixedly connected with a cylinder end (12), and a self-lubricating bearing (13) is fixedly connected to the inside of the cylinder end (12).

6. The hydraulic control system for the synchronous opening and closing plate of a filter press according to claim 2, characterized in that: The circumferential side surface of the piston sheet (15) is provided with a first annular groove, and a magnet ring (23) is fixedly connected inside the first annular groove; the inner wall of the oil cylinder body (9) between the two oil ports (14) is provided with a second annular groove, and an electromagnetic coil (7) electrically connected with the controller is fixedly connected inside the second annular groove; the electromagnetic coil (7) and the magnet ring (23) magnetically attract each other when the electromagnetic coil (7) is electrified.

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