A high and low voltage closed loop control system for battery pole piece roller press

Abstract

The present invention provides a high and low pressure closed-loop control system for a battery pole piece roller press, comprising a hydraulic cylinder group, an upper chamber pipeline for supplying oil to the upper hydraulic chamber of the hydraulic cylinder group, and a lower chamber pipeline for supplying oil to the lower hydraulic chamber of the hydraulic cylinder group; the technical effect of differential pressure type precise pressure control is achieved by adopting a proportional relief valve, the system controls the rodless chamber pressure of the main cylinder hydraulic cylinder through a high-frequency response servo valve, the response speed is fast, and the closed-loop oil circuit is safer.

Description

Technical Field

[0001] The invention relates to the technical field of battery pole piece production, and in particular to a high-low pressure switching and pressure closed-loop control system for a battery pole piece roller press. Background Art

[0002] At present, the main roller pressing and compacting method of the battery roller press mainly relies on the inclined iron to control the roller gap, and the main cylinder pressure is controlled by the hydraulic station main cylinder oil circuit to fine-tune the roller's pressure reduction amount, so that the roller press can roll the pole pieces from the coater; the bending cylinder pressure is controlled by the manual pressure reducing valve on the bending cylinder oil circuit, so as to realize the roller shape control of the longer roller and the consistency control of the rolled pole pieces.

[0003] Disadvantages of this method:

[0004] (1) The minimum control pressure of the master cylinder does not meet the production requirements of the sensitive electrode. Excessive pressure causes excessive compaction and damage to the electrode.

[0005] (2) The pressure of the bending cylinder is controlled manually, which is inconvenient to operate and difficult to control. It is impossible to adjust the pressure online, and thus it is impossible to achieve online control of the consistency of the roller-pressed pole piece. Summary of the invention

[0006] In order to solve the problem of hidden dangers left behind due to the unscientific design of the above-mentioned drainage tube, the present invention specifically proposes a medical anti-breakage drainage tube, which has a metal wire wrapped inside. The metal wire is not easily broken during the removal process. Therefore, even if a section of drainage tube is left in the human body, it can be quickly discovered, which can effectively prevent hidden dangers left behind.

[0007] The technical solutions provided are:

[0008] A medical anti-fracture drainage tube includes a drainage tube body 4, which is a tube structure with a hollow cavity. A flexible tube portion 4b is provided between the hollow cavity and the outer wall of the drainage tube body. At least a plurality of metal strands 4a are passed through the flexible tube portion. The metal strands are cross-arranged in the flexible tube portion or are arranged in parallel in the flexible tube portion.

[0009] Furthermore, it also includes a front cone needle 5, and the drainage tube body includes a straight tube section and a curved tube section connected to each other, and the tail end of the front cone needle is embedded in the straight tube section to form a straight drainage tube body.

[0010] Furthermore, the other end of the drainage tube body opposite to the linear drainage tube body is a drainage end, and the drainage end of the drainage tube body is connected to the drainage bottle 1.

[0011] Furthermore, it also includes a choke tube 3 for preventing gas backflow, the drainage end of the drainage tube body is connected to the choke tube, and the choke tube is assembled and fixed at the liquid inlet of the drainage bottle.

[0012] Furthermore, at least two choke rings are formed on the inner wall of the choke tube from top to bottom and are raised from the inner wall into a ring shape, and the spacing between each choke ring and the adjacent choke ring is less than half the length of the choke tube.

[0013] Furthermore, a one-way conducting tube is connected to the drainage bottle.

[0014] Furthermore, the one-way guide tube includes a first tube and a top plate, the first tube is fixed at the gas outlet of the drainage bottle, the top plate is hinged at the top outlet of the first tube, and the shape of the top plate just matches the top outlet of the first tube.

[0015] The beneficial effects of the present invention compared to the prior art are:

[0016] The system controls the rodless chamber pressure of the master cylinder hydraulic cylinder through a high-frequency response servo valve, and forms a pressure closed loop with the high-frequency switching function of the servo valve and the pressure sensor installed on the hydraulic cylinder; the pressure oil of the upper bending cylinder is introduced into the rod chamber of the master cylinder to achieve pressure control of the master cylinder; this master cylinder oil circuit system requires a servo valve, a double-acting hydraulic cylinder, and an electromagnetic overflow valve on the operating side and the transmission side respectively, and also requires a high-precision pressure sensor (1. The response time of the pressure sensor must be fast enough; 2. The sampling time of the pressure sensor must be fast and have a fixed time interval; 3. The sampling time must be a constant;) to display the pressure value of the rodless chamber of the servo hydraulic cylinder.

[0017] (2) The pressure value of the bending cylinder can be adjusted online through a proportional overflow pressure reducing valve. The operating side and the transmission side of the bending cylinder oil circuit system each require a proportional overflow pressure reducing valve, a double-acting hydraulic cylinder, a first leak-free reversing valve, and a superimposed throttle valve. At the same time, a high-precision pressure sensor is required to display the pressure value of the bending cylinder rod chamber hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the overall structure diagram.

[0019] Figure 2 This is an enlarged structural diagram of the connection between the hydraulic cylinder group and the pipelines and devices.

[0020] Figure 3 Schematic diagram of main components and pipeline matching.

[0021] Figure 4 This is the voltage and current correspondence diagram of the proportional overflow reversing valve under PLC control.

[0022] Reference numerals:

[0023] Oil return passage 1, oil delivery passage 2, lower chamber front section branch pipe 3, lower chamber precise pressure control branch pipe 4, pressure relief pipe 5, upper chamber front section branch pipe 6, upper chamber precise pressure control branch pipe 7, side branch boost pipe 8, boost pipeline 9, storage unit 10, hydraulically controlled one-way valve 11, lower proportional overflow pressure reducing valve 12, servo valve 13, pressure reducing valve 14, hydraulic cylinder group 15, electromagnetic overflow valve 16, longitudinal hydraulic cylinder group 17, electromagnetic reversing valve 18, hydraulically controlled one-way valve 19, superimposed pipeline 20, first leakage-free reversing valve 21, first leakage-free reversing valve 22. DETAILED DESCRIPTION

[0024] The following is based on the attached Figure 1-3 Explanation: The following descriptions are all preset devices for the natural flow direction of the oil circuit from upstream to downstream.

[0025] Provided is a high-low pressure closed-loop control system for a battery pole sheet roller press, comprising a hydraulic cylinder group 15, an upper chamber pipeline for supplying oil to an upper hydraulic chamber of the hydraulic cylinder group, and a lower chamber pipeline for supplying oil to a lower hydraulic chamber of the hydraulic cylinder group;

[0026] The lower chamber pipeline of the mechanism for supplying oil to the lower hydraulic chamber of the hydraulic cylinder group is composed of:

[0027] like Figure 1 , 3 As shown, the pipeline in the lower cavity includes a lower cavity front section branch pipe 3 and a lower cavity precise pressure control branch pipe 4, a hydraulically controlled one-way valve 11 and a high-pressure filter are connected in series on the lower cavity front section branch pipe, and the end of the lower cavity front section branch pipe is connected to two sections of lower cavity precise pressure control branch pipes 4, each lower cavity precise pressure control branch pipe is equipped with a lower proportional overflow pressure reducing valve 12 and an electromagnetic reversing valve 18, two lower proportional overflow pressure reducing valves are connected in parallel, and the downstream of the two lower proportional overflow pressure reducing valves are connected to the lower proportional overflow pressure reducing valves through a superimposed pipeline 20. Upstream, a superimposed throttle valve and a third leak-free reversing valve are installed on the superimposed pipeline. The end of the lower chamber precise pressure control branch pipe is connected to the lower hydraulic chamber of the hydraulic cylinder group 15. The A oil discharge ports of the electromagnetic reversing valves 18 of the two lower chamber precise pressure control branches are respectively connected to the transverse hydraulic cylinder group 16 for lateral movement of the upper bending cylinder and the longitudinal hydraulic cylinder group 17 for driving the longitudinal movement of the upper bending cylinder. The pipeline between the P oil discharge port of each electromagnetic reversing valve and the hydraulic cylinder group is equipped with a first leak-free reversing valve.

[0028] The upper chamber pipeline of the mechanism for supplying oil to the upper hydraulic chamber of the hydraulic cylinder group is composed of:

[0029] The upper cavity pipeline includes an upper cavity front section branch pipe 6 and an upper cavity precise pressure control branch pipe 7. A hydraulically controlled one-way valve 19 and a high-pressure filter are connected in series on the upper cavity front section branch pipe. The two upper cavity precise pressure control branch pipes 7 are connected at the end of the upper cavity front section branch pipe. A servo valve 13 and an electromagnetic overflow valve 16 are connected in parallel on the upper cavity precise pressure control branch pipe. The two upper cavity precise pressure control branch pipes are connected to the upper hydraulic cavity of the hydraulic cylinder group through the upper cavity common pipe.

[0030] The B port of the hydraulically controlled one-way valve 19 is connected to the upper chamber common pipe through the side branch boost pipe 8, and a pressure reducing valve 14 and a first non-leakage reversing valve are serially arranged on the side branch boost pipe.

[0031] The main circuit of this mechanism is:

[0032] The oil supply passage 2 and the oil return passage 1, the upper chamber front section branch pipe, and the lower chamber front section branch pipe are all connected to the oil supply passage 2, and the T return oil port of each lower proportional overflow pressure reducing valve and the oil return port of each electromagnetic overflow valve and the oil return port of the pressure reducing valve are all connected to the oil return pipeline.

[0033] The T of the servo valve has a port connected to the oil return pipeline.

[0034] The storage unit 10 of the storage oil pool is connected to the oil delivery passage through the boosting pipeline 9. The boosting pipeline is equipped with a butterfly valve, a shock absorber throat, a plunger pump, a high-pressure hose, a one-way valve, an oil inlet filter, a pressure measuring joint, and a ball valve in sequence in the oil delivery direction. The return oil pipeline is connected to the storage unit through the pressure relief pipe 5. The pressure relief pipe is equipped with a stacked throttle valve, a cooler, and an oil return filter in sequence in the oil discharge direction. The pressure relief pipe is connected to the boosting pipeline through a pressure equalizing pipe, and the pressure equalizing pipe is equipped with an electromagnetic overflow valve.

[0035] High and low pressure switching function of the master cylinder: high and low pressure switching oil circuit of the master cylinder pressure,

[0036] In the high oil pressure state, the two lower chamber precise pressure control branch pipes 4 are equipped with a first leak-free reversing valve 21, and the first leak-free reversing valve 21 is located between the electromagnetic reversing valve 18 and the hydraulic cylinder group. The B port of the first leak-free reversing valve 33 installed on the two lower chamber precise pressure control branch pipes 4 is connected to the B port of the second leak-free reversing valve 22. The second leak-free reversing valve 22 is arranged between the pressure reducing valve 14 and the hydraulic cylinder group. The A port of the first leak-free reversing valve 23 is connected to the A port or B port of the electromagnetic reversing valve 18 corresponding to the A port, so as to form a passage to provide high oil pressure.

[0037] When the oil pressure is low, the hydraulically controlled one-way valve 11, the first leak-free reversing valve 21, the second leak-free reversing valve 22, and the servo valve 13 are energized, and the high-pressure oil output from the bent cylinder oil circuit flows from the B port of the electromagnetic reversing valve 18 through the B port of the first leak-free reversing valve into the lower chamber of the hydraulic cylinder group, and the upper chamber of the hydraulic cylinder group flows into the upper chamber of the master cylinder control through the A port of the servo valve 13. Both the upper and lower chambers of the master cylinder are controlled by online adjustable high-pressure oil, thereby forming a pressure difference, and the output force of the master cylinder can be adjusted steplessly by adjusting the pressure.

[0038] (2) Pressure closed loop of the bending cylinder oil circuit: The proportional relief pressure reducing valve 12, the superimposed throttle valve, the third non-leakage reversing valve, and the pressure sensor are used to form a precise control and rapid pressure relief mode for the bending cylinder pressure. The Out port of the proportional relief pressure reducing valve and the A port of the superimposed throttle valve are connected to the hydraulic cylinder group; the T port of the proportional relief pressure reducing valve and the B port of the third non-leakage reversing valve are connected to the return oil pipeline and connected to the storage unit, i.e., the oil tank;

[0039] The electromagnetic signal of the proportional relief pressure reducing valve is controlled by the corresponding amplifier board; after the bending cylinder pressure is set, after the hydraulic control check valve 11 is electrically switched, the high-pressure oil enters the In side of the proportional relief pressure reducing valve, and the PLC sends a command to control the output current of the amplifier board to control the intensity of the electromagnetic signal of the proportional relief pressure reducing valve, and then controls the output pressure of the proportional relief pressure reducing valve. The relationship between the input current and the output pressure of the valve is shown in Figure 1 The output pressure of the proportional relief pressure reducing valve is only controlled by a fixed signal of PLC and deviates from the actual value. At this time, the output pressure needs to be detected by a sensor and compared with the set value. The pressure value is corrected through PID to achieve precise control. When the pressure on the Out side of the proportional relief pressure reducing valve is greater than the pressure on the In side, this valve performs the overflow function to ensure the safety of the system and prevent the instantaneous increase of the bending cylinder pressure during the operation of the main cylinder, which may damage the pipeline. When the bending cylinder needs to relieve pressure, the third leak-free reversing valve is energized, and the high-pressure oil in the bending cylinder flows from the A port of the superimposed throttle valve through the B port of the first leak-free reversing valve back to the oil tank.

Claims

1. A high and low voltage closed loop control system for a battery pole piece roller press, characterized in that: It includes a hydraulic cylinder group, an upper chamber pipeline for supplying oil to an upper hydraulic chamber of the hydraulic cylinder group, and a lower chamber pipeline for supplying oil to a lower hydraulic chamber of the hydraulic cylinder group; The pipeline in the lower cavity includes a lower cavity front section branch pipe and a lower cavity precise pressure control branch pipe. A hydraulically controlled one-way valve and a high-pressure filter are connected in series to the lower cavity front section branch pipe. The end of the lower cavity front section branch pipe is connected to two sections of lower cavity precise pressure control branch pipes. Each lower cavity precise pressure control branch pipe is equipped with a lower proportional overflow pressure reducing valve and an electromagnetic reversing valve. The end of the lower cavity precise pressure control branch pipe is connected to the lower hydraulic cavity of the hydraulic cylinder group. The pipeline located in the upper cavity includes an upper cavity front section branch pipe and an upper cavity precise pressure control branch pipe. A hydraulically controlled one-way valve and a high-pressure filter are connected in series to the upper cavity front section branch pipe. The end of the upper cavity front section branch pipe is connected to two upper cavity precise pressure control branch pipes. A servo valve, an electromagnetic overflow valve, and a one-way throttle valve are connected in parallel to the upper cavity precise pressure control branch pipe. The two upper cavity precise pressure control branch pipes are connected to the upper hydraulic cavity of the hydraulic cylinder group through the upper cavity common pipe. Two lower proportional relief pressure reducing valves are connected in parallel, and the downstream of the two lower proportional relief pressure reducing valves are connected to the upstream of the two lower proportional relief pressure reducing valves through a superimposed pipeline, and a superimposed throttle valve and a non-leakage reversing valve are installed on the superimposed pipeline; The B port of the hydraulically controlled one-way valve is connected to the upper chamber common pipe through a side branch booster pipe, and a pressure reducing valve and a non-leakage reversing valve are arranged in series on the side branch booster pipe.

2. A high and low voltage closed loop control system for a battery pole piece roller press according to claim 1, characterized in that: The A oil discharge ports of the electromagnetic reversing valves of the two lower chamber precision pressure control branches are respectively connected to the transverse hydraulic cylinder group for lateral movement of the upper bending cylinder and the longitudinal hydraulic cylinder group for driving the longitudinal movement of the upper bending cylinder. A leak-free reversing valve is installed on the pipeline between the P oil discharge port of each electromagnetic reversing valve and the hydraulic cylinder group.

3. A high and low voltage closed loop control system for a battery pole piece roller press according to claim 1, characterized in that: It also includes an oil supply passage and an oil return passage. The front branch pipe of the upper chamber and the front branch pipe of the lower chamber are connected to the oil supply passage. The T return oil port of each lower proportional overflow pressure reducing valve and the oil return port of each electromagnetic overflow valve and the oil return port of the pressure reducing valve are connected to the oil return pipeline.

4. A high and low voltage closed loop control system for a battery pole piece roller press according to claim 3, characterized in that: The T of the servo valve has a port connected to the oil return pipeline.

5. A high and low voltage closed loop control system for a battery pole piece roller press according to claim 4, characterized in that: It also includes a storage unit for storing an oil pool, which is connected to the oil delivery passage through a boosting pipeline, and the boosting pipeline is equipped with a butterfly valve, a shock absorber throat, a plunger pump, a high-pressure hose, a one-way valve, an oil inlet filter, a pressure measuring joint, and a ball valve in sequence in the oil delivery direction. The return oil pipeline is connected to the storage unit through a pressure relief pipe, and the pressure relief pipe is equipped with a stacked throttle valve, a cooler, and an oil return filter in sequence in the oil discharge direction.

6. A high and low voltage closed loop control system for a battery pole piece roller press according to claim 1, characterized in that: The pressure relief pipe is connected to the pressure boosting pipeline through a pressure equalizing pipe, and an electromagnetic overflow valve is installed on the pressure equalizing pipe.

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