A pump-controlled bending roll hydraulic system and bending roll device for a lithium battery pole piece rolling mill

Abstract

The present invention relates to a pump-controlled bending roll hydraulic system and bending roll device of a lithium battery pole piece rolling mill. Bending roll cylinders are arranged at both ends of the upper and lower bearing seats of the bending roll device. A pump-controlled bending roll hydraulic system is arranged on the outer side of each bending roll cylinder. The bending roll pressure instruction is given to the controller. The controller outputs a speed signal to control the servo motor to drive the bidirectional quantitative pump to rotate and build pressure. The first oil port of the bidirectional quantitative pump sucks oil from the rodless cavity of the bending roll cylinder through a low-pressure hole and a low-pressure pipeline, and the second oil port of the bidirectional quantitative pump presses oil to the rod cavity of the bending roll cylinder through a high-pressure hole and a high-pressure pipeline. The hydraulic bending roll force generated by the bending roll cylinder causes the roller to produce additional bending to compensate for the lateral spacing deviation of the roll gap and improve the consistency of the rolled thickness of the pole piece. The present invention can not only realize high-precision rolling of battery pole pieces, but also reduce the installation, operation and maintenance costs of the system, and improve the power-to-weight ratio and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of pole piece roll forming equipment, and in particular to a pump-controlled roller bending hydraulic system and a roller bending device for a lithium battery pole piece rolling mill. Background Art

[0002] The consistency of pole piece roll-forming thickness is one of the important indicators to measure the performance of lithium batteries. Hydraulic roller bending is currently the most widely used pole piece thickness control method. By applying hydraulic roller bending force to the roller bearing seat, the roller produces additional bending to compensate for the lateral spacing deviation of the roller gap and improve the uniformity of the pole piece rolling thickness.

[0003] Since the pole pieces are subject to non-restrictive multi-source disturbances such as roll eccentricity, frame deformation, and incoming material fluctuations during the rolling process, in order to ensure the rolling quality of the pole pieces, the hydraulic bending roll system is required to quickly respond to and compensate for various interferences and approach the bending roll force set value with high accuracy. Therefore, the dynamic performance and steady-state accuracy of the bending roll force control system directly affect the forming quality of the battery pole pieces.

[0004] Traditional hydraulic bending rolls use electro-hydraulic servo valve-controlled cylinder technology. Electro-hydraulic servo valve-controlled bending rolls are composed of hydraulic oil source, pipeline system, servo valve, hydraulic cylinder, sensor and control system. Although valve-controlled bending rolls have good control performance, the complex system configuration leads to low equipment integration and high installation cost. In addition, the constant pressure operation of the hydraulic oil source and the throttling loss of the pipeline and valve port lead to waste of system energy. In addition, due to the poor anti-pollution ability of the servo valve, the oil cleanliness level is required to be high (NAS3-5), and the system needs to be equipped with a precise filtering device, which increases the installation cost. In order to ensure the reliable operation of the system, stringent requirements are put forward for equipment maintenance. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a lithium battery pole piece rolling mill pump-controlled bending roller hydraulic system and a bending roller device, which can achieve high-precision rolling of pole pieces, reduce the installation, operation and maintenance costs of the system, and improve the power-to-weight ratio and reliability.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A pump-controlled bending roll hydraulic system for a lithium battery pole piece rolling mill, comprising a controller, a servo motor, a high-pressure pipeline, a two-way quantitative pump, a low-pressure pipeline, a valve block, a first relief valve, a second relief valve, a first non-return valve, a second non-return valve, a first pressure sensor, a second pressure sensor and a first accumulator; a high-pressure channel, an oil drain channel and a low-pressure channel are provided in the valve block; the output shaft of the servo motor is connected to the input shaft of the two-way quantitative pump through a coupling, the oil port surface of the two-way quantitative pump is fitted with the wall surface of the valve block, the first oil port of the two-way quantitative pump is connected to the rodless cavity of the bending roll cylinder through the low-pressure channel and the low-pressure pipeline in turn, the second oil port of the two-way quantitative pump is connected to the rod cavity of the bending roll cylinder through the high-pressure channel and the high-pressure pipeline in turn, the two-way quantitative pump The third oil port is connected to the oil drain channel; the first accumulator is connected to the oil drain channel; the oil inlet of the first relief valve is connected to the high-pressure channel, the oil inlet of the second relief valve is connected to the low-pressure channel, and the oil outlets of the first relief valve and the second relief valve are both connected to the oil drain channel; the oil outlet of the first check valve is connected to the high-pressure channel, the oil outlet of the second check valve is connected to the low-pressure channel, and the oil inlets of the first check valve and the second check valve are both connected to the oil drain channel; the first pressure sensor is arranged on the high-pressure channel, and the second pressure sensor is arranged on the low-pressure channel; the first pressure sensor and the second pressure sensor are connected to the controller, and the controller is connected to the servo motor via the servo driver to perform closed-loop control on the servo motor.

[0008] Furthermore, it also includes a quick-change joint and a pressure relay, wherein the quick-change joint and the pressure relay are both arranged on the oil drain channel, and the pressure relay is connected to the controller.

[0009] Furthermore, it also includes a temperature sensor; the temperature sensor is arranged on the low-pressure channel, and the temperature sensor is connected to the controller.

[0010] Furthermore, it also includes an electromagnetic reversing valve, a first damping screw, a second damping screw and a second accumulator; the electromagnetic reversing valve is bridged between the high-pressure channel and the low-pressure channel, the first damping screw is installed between the electromagnetic reversing valve and the high-pressure channel, the second damping screw is installed between the electromagnetic reversing valve and the low-pressure channel, and the second accumulator is connected to the high-pressure channel; the controller is connected to the electromagnetic reversing valve.

[0011] A lithium battery pole piece rolling mill bending roll device, comprising a base, an archway fixedly mounted on the base, and an upper roll device and a lower roll device mounted in the archway and sliding up and down; the upper roll device comprises an upper bearing seat, an upper roll mounted in the upper bearing seat through an upper bearing, and two bending roll cylinders symmetrically arranged at the upper left and right ends of the upper bearing seat; the lower roll device comprises a lower bearing seat, a lower roll mounted in the lower bearing seat through a lower bearing, and two bending roll cylinders symmetrically arranged at the lower left and right ends of the lower bearing seat; the cylinder rod of each bending roll cylinder is respectively connected to the corresponding end of the corresponding bearing seat; a set of the pump-controlled bending roll hydraulic system is arranged on the outer side of each bending roll cylinder.

[0012] Furthermore, the bending roller cylinder includes a cylinder barrel and a cylinder rod; a double-ear support seat is fixedly arranged on the arch, and the cylinder barrel is arranged on the double-ear support seat through a cylinder barrel fixing pin; the cylinder rod is installed on the end of the corresponding bearing seat through a lever fixing pin.

[0013] The beneficial effects of adopting the above technical solution are:

[0014] (1) The present invention eliminates the need for a large hydraulic station, complex piping systems, and expensive servo valves, thereby reducing installation costs. It uses servo-driven energy-saving technology to effectively avoid the overflow and throttling losses of traditional valve-controlled AGCs, thereby reducing operating costs. It also has good anti-pollution capabilities, eliminating the need for frequent replacement of system filters, thereby reducing maintenance costs. (2) The pump-controlled bending roll hydraulic system is highly integrated and convenient for installation on the mechanical body of the pole piece rolling mill, thereby improving the power-to-weight ratio. It effectively avoids servo valve failures caused by oil leakage and oil impurity contamination in complex piping systems, thereby improving reliability. (3) The pressure closed-loop control that combines logic control, classic PID, and pressure feedforward compensation makes the system respond faster and has higher control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the bending roll device of the lithium battery pole piece rolling mill of the present invention;

[0016] Figure 2 It is the hydraulic principle diagram of the present invention;

[0017] Figure 3 It is a logic control flow chart of the present invention;

[0018] Figure 4 It is the block diagram of the pressure closed loop control of the present invention;

[0019] In the figure: 1-base, 2-archway, 3-lower roller device, 4-lower bearing seat, 5-lower roller, 6-upper roller, 7-upper bearing seat, 8-high pressure pipeline, 9-servo motor, 10-coupling, 11-two-way quantitative pump, 11.1-first oil port, 11.2-second oil port, 11.3-third oil port, 12-low pressure pipeline, 13-double ear support seat, 14-cylinder fixing pin, 15-bending roller cylinder, 16-cylinder, 17-cylinder rod, 18-cylinder rod fixing pin, 19-upper bearing, 20- Upper roller device, 21-lower bearing, 22-pressure relay, 23-quick-change connector, 24-first accumulator, 25-first one-way valve, 26-second one-way valve, 27-valve block, 28-high-pressure channel, 29-oil drain channel, 30-low-pressure channel, 31-first overflow valve, 32-second overflow valve, 33-temperature sensor, 34-first pressure sensor, 35-first damping screw, 36-electromagnetic reversing valve, 37-second damping screw, 38-second pressure sensor, 39-second accumulator. DETAILED DESCRIPTION

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further explained below through the accompanying drawings and implementation cases.

[0021] Embodiment 1:

[0022] like Figure 1 , 2As shown, a pump-controlled bending roll hydraulic system for a lithium battery pole piece rolling mill includes a controller, a servo motor 9, a high-pressure pipeline 8, a two-way quantitative pump 11, a low-pressure pipeline 12, a valve block 27, a first relief valve 31, a second relief valve 32, a first non-return valve 25, a second non-return valve 26, a first pressure sensor 34, a second pressure sensor 38 and a first accumulator 24; a high-pressure channel 28, an oil drain channel 29 and a low-pressure channel 30 are provided in the valve block 27; the output shaft of the servo motor 9 is connected to the input shaft of the two-way quantitative pump 11 through a coupling 10, the oil port surface of the two-way quantitative pump 11 is fitted with the wall surface of the valve block 27, the first oil port 11.1 of the two-way quantitative pump 11 is connected to the rodless cavity of the bending roll cylinder 15 through the low-pressure channel 30 and the low-pressure pipeline 12 in turn, and the second oil port 11.2 of the two-way quantitative pump 11 is connected to the rod-less cavity of the bending roll cylinder 15 through the high-pressure channel 28 and the high-pressure pipeline 8 in turn. The first accumulator 24 is connected to the oil drain channel 29; the oil inlet of the first relief valve 31 is connected to the high-pressure channel 28, the oil inlet of the second relief valve 32 is connected to the low-pressure channel 30, and the oil outlets of the first relief valve 31 and the second relief valve 32 are both connected to the oil drain channel 29; the oil outlet of the first check valve 25 is connected to the high-pressure channel 28, the oil outlet of the second check valve 26 is connected to the low-pressure channel 30, and the oil inlets of the first check valve 25 and the second check valve 26 are both connected to the oil drain channel 29; the first pressure sensor 34 is arranged on the high-pressure channel 28, and the second pressure sensor 38 is arranged on the low-pressure channel 30; the first pressure sensor 34 and the second pressure sensor 38 are connected to the controller, and the controller is connected to the servo motor 9 via the servo driver to perform closed-loop control on the servo motor 9.

[0023] The present invention adopts an integrated volume control scheme in which a servo motor 9 with a bidirectional quantitative pump 11 directly drives and controls the bending roll cylinder 15. The bending roll hydraulic pressure value is set according to the rolling quality of the battery electrode sheet. The controller receives the pressure command and sends a speed signal to the servo driver. The servo driver then controls the servo motor 9 to drive the bidirectional quantitative pump 11 to rotate and build pressure. The first oil port 11.1 of the bidirectional quantitative pump 11 sucks oil from the rodless cavity of the bending roll cylinder 15, and the second oil port 11.2 presses oil into the rod cavity of the bending roll cylinder 15. The leaked oil in the bidirectional quantitative pump 11 is sequentially stored in the first accumulator 24 through the third oil port 11.3 and the oil drain channel 29; the first pressure The sensor 34 and the second pressure sensor 38 are used to monitor the pressure of the high and low pressure channels 28 and 30 respectively, and feed back to the controller in real time. When the pressure of the high and low pressure channels 28 and 30 exceeds the safety set value, the first relief valve 31 and the second relief valve 32 overflow the excess oil into the first accumulator 24 through the oil leakage channel 29, so that the pressure of the high and low pressure channels 28 and 30 is stabilized within a safe range; the first accumulator 24, as the system's oil replenishment unit, replenishes oil to the system's high and low pressure channels 28 and 30 through the oil leakage channel 29 and the first check valve 25 and the second check valve 26 to compensate for internal and external leakage generated during the operation of the system.

[0024] The pump-controlled bending roll hydraulic system also includes a quick-change joint 23 and a pressure relay 22; the quick-change joint 23 and the pressure relay 22 are both arranged on the oil drain hole 29, and the pressure relay 22 is connected to the controller. When the pressure relay 22 detects that the pressure in the oil replenishment chamber, i.e., the oil drain hole 29, is lower than the minimum allowable value, the system issues an alarm and the equipment shuts down. At this time, oil needs to be replenished to the first accumulator 24 through the quick-change joint 23.

[0025] The pump-controlled bending roll hydraulic system also includes a temperature sensor 33; the temperature sensor 33 is arranged on the low-pressure channel 30, and the temperature sensor 33 is connected to the controller. When the temperature sensor 33 detects that the oil temperature in the low-pressure channel 30 of the system is too high, the system issues an alarm and the equipment shuts down. At this time, the equipment needs to be left still for a period of time until the oil temperature cools down to the allowable working range.

[0026] The pump-controlled bending roll hydraulic system also includes an electromagnetic reversing valve 36, a first damping screw 35, a second damping screw 37 and a second accumulator 39; the electromagnetic reversing valve 36 is connected between the high-pressure channel 28 and the low-pressure channel 30, the first damping screw 35 is installed between the electromagnetic reversing valve 36 and the high-pressure channel 28, the second damping screw 37 is installed between the electromagnetic reversing valve 36 and the low-pressure channel 30, and the second accumulator 39 is connected to the high-pressure channel 28; the controller is connected to the electromagnetic reversing valve 36. When the equipment is ready to shut down or encounters an emergency and needs to be stopped and unloaded, the electromagnetic reversing valve 36 is energized, the high and low pressure channels 28 and 30 are connected, the system is unloaded, the cylinder rod 17 is extended, and the first damping screw 35 and the second damping screw 37 are used to prevent excessive impact vibration during unloading; the second accumulator 39 is used to absorb the pressure pulsation of the oil, which is easy to accurately control the system pressure.

[0027] like Figure 3 As shown, the logic control method of the pump-controlled bending roll system of the present invention is: after the equipment is started, it is initialized first, and then the system is detected whether there is an unloading and alarm instruction. If there is an unloading instruction, the unloading subroutine is triggered, the electromagnetic reversing valve 36 is opened, the system is unloaded, and the servo motor 9 is in standby mode; if there is an alarm instruction, the open-loop subroutine is triggered, and the servo motor 9 is in standby mode. If there is no unloading and alarm instruction, the system starts temperature and pressure self-test. When the detected temperature and pressure are outside the normal operating range of the equipment, the servo motor 9 is also in standby mode. If the system temperature and pressure self-test are normal, the equipment can start normal operation. At this time, a pressure instruction is given, and the system calls the closed-loop control subroutine to control the speed of the servo motor 9, so that the system pressure responds quickly to the given pressure and stabilizes it within the required accuracy range.

[0028] like Figure 4 As shown, the pressure closed-loop control process of the pump-controlled bending roll system of the present invention is as follows: the upper computer gives the bending roll pressure instruction to the controller through the bus form, and the controller receives the feedback pressure from the first pressure sensor 34. By comparing the two pressures in real time, the controller PID closed-loop control program outputs the expected speed signal to the servo driver, and the servo driver controls the servo motor 9 to drive the two-way quantitative pump 11 to rotate. When the rod chamber pressure exceeds the given pressure, the controller issues a negative speed instruction, and the second oil port 11.2 of the two-way quantitative pump 11 sucks oil from the rod chamber to reduce pressure; when the rod chamber pressure is lower than the given pressure, the controller issues a positive speed instruction, and the second oil port 11.2 of the two-way quantitative pump 11 injects oil into the rod chamber to increase pressure, thereby realizing high-precision output of the system pressure. At the same time, the system adopts a pressure feedforward compensation controller, which calculates the servo motor speed compensation value by performing trajectory planning on the set pressure, and works together with the controller output speed signal in the servo driver to make the system respond faster and have higher control accuracy.

[0029] Embodiment 2:

[0030] like Figure 1 As shown, a lithium battery pole piece rolling mill bending device comprises a base 1, an archway 2 fixedly mounted on the base 1, and an upper rolling device 20 and a lower rolling device 3 mounted in the archway 2 and sliding up and down; the upper rolling device 20 comprises an upper bearing seat 7, an upper rolling roller 6 mounted in the upper bearing seat 7 through an upper bearing 19, and two bending roller cylinders 15 symmetrically arranged at the upper left and right ends of the upper bearing seat 7; the lower rolling device 3 comprises a lower bearing seat 4, a lower rolling roller 5 mounted in the lower bearing seat 4 through a lower bearing 21, and two bending roller cylinders 15 symmetrically arranged at the lower left and right ends of the lower bearing seat 4; the cylinder rod 17 of each bending roller cylinder 15 is respectively connected to the corresponding end of the corresponding bearing seat 4, 7; and a set of the above-mentioned pump-controlled bending roller hydraulic system is arranged on the outer side of each bending roller cylinder 15. The servo motor 9, the bidirectional quantitative pump 11 and the valve block 27 are all fixedly arranged on the archway 2.

[0031] In the bending roll device, the bending roll cylinder 15 includes a cylinder barrel 16 and a cylinder rod 17; a double-ear support seat 13 is fixedly provided on the arch 2, and the cylinder barrel 16 is arranged on the double-ear support seat 13 through a cylinder barrel fixing pin 14; the cylinder rod 17 is installed on the end of the corresponding bearing seat through a lever fixing pin 18.

[0032] The four roll bending cylinders 15 of the roll bending device are respectively connected to a set of pump-controlled roll bending hydraulic systems. The first oil port 11.1 of the two-way quantitative pump 11 in each set of pump-controlled roll bending hydraulic systems is connected to the rodless chamber of the roll bending cylinder 15 through the low-pressure pipeline 12, and the second oil port 11.2 of the two-way quantitative pump 11 is connected to the rod chamber of the roll bending cylinder 15 through the high-pressure pipeline 8. The roll bending pressure instruction is given to the controller, and the controller outputs a speed signal to control the servo motor to drive the two-way quantitative pump 11 to rotate and build pressure. The first oil port 11.1 of the two-way quantitative pump 11 sucks oil from the rodless chamber of the roll bending cylinder 15 through the low-pressure channel and low-pressure pipeline, and the second oil port 11.2 of the two-way quantitative pump 11 presses oil to the rod chamber of the roll bending cylinder 15 through the high-pressure channel and high-pressure pipeline, so that the cylinder rod 17 generates a retracting force. The hydraulic bending force generated by the bending cylinder 15 causes the roll to bend additionally, changes the roll gap convexity, and compensates for the roll gap lateral spacing deviation, thereby controlling the forming accuracy of the lithium battery pole piece and improving the consistency of the pole piece rolling thickness. The present invention can not only realize high-precision rolling of battery pole pieces, but also reduce the installation, operation and maintenance costs of the system, and improve the power-to-weight ratio and reliability.

Claims

1. A pump-controlled bending roll hydraulic system for a lithium battery pole piece rolling mill, characterized in that: The device comprises a controller, a servo motor (9), a high-pressure pipeline (8), a bidirectional quantitative pump (11), a low-pressure pipeline (12), a valve block (27), a first overflow valve (31), a second overflow valve (32), a first check valve (25), a second check valve (26), a first pressure sensor (34), a second pressure sensor (38) and a first accumulator (24); The valve block (27) is provided with a high-pressure hole (28), an oil drain hole (29) and a low-pressure hole (30); the output shaft of the servo motor (9) is connected to the input shaft of the bidirectional quantitative pump (11) through a coupling (10); the oil port surface of the bidirectional quantitative pump (11) is mounted in contact with the wall surface of the valve block (27); the first oil port (11.1) of the bidirectional quantitative pump (11) is connected to the rodless chamber of the bending roller cylinder (15) through the low-pressure hole (30) and the low-pressure pipeline (12); the second oil port (11.2 ) are connected to the rod chamber of the roller bending cylinder (15) through the high-pressure channel (28) and the high-pressure pipeline (8) in sequence, and the third oil port (11.3) of the two-way quantitative pump (11) is connected to the oil drain channel (29); the first accumulator (24) is connected to the oil drain channel (29); the oil inlet of the first overflow valve (31) is connected to the high-pressure channel (28), the oil inlet of the second overflow valve (32) is connected to the low-pressure channel (30), and the oil outlets of the first overflow valve (31) and the second overflow valve (32) are both connected to the oil drain channel (29); The oil outlet of the first one-way valve (25) is connected to the high-pressure channel (28), the oil outlet of the second one-way valve (26) is connected to the low-pressure channel (30), and the oil inlets of the first one-way valve (25) and the second one-way valve (26) are both connected to the oil drain channel (29); the first pressure sensor (34) is arranged on the high-pressure channel (28), and the second pressure sensor (38) is arranged on the low-pressure channel (30); The first pressure sensor (34) and the second pressure sensor (38) are connected to a controller, and the controller is connected to a servo motor (9) via a servo driver to perform closed-loop control on the servo motor (9); It also includes a quick-change joint (23) and a pressure relay (22), wherein the quick-change joint (23) and the pressure relay (22) are both arranged on the oil drain channel (29), and the pressure relay (22) is connected to the controller; It also includes a temperature sensor (33); the temperature sensor (33) is arranged on the low-pressure duct (30), and the temperature sensor (33) is connected to the controller.

2. The pump-controlled bending roll hydraulic system of a lithium battery pole piece rolling mill according to claim 1, characterized in that: The invention also comprises an electromagnetic reversing valve (36), a first damping screw (35), a second damping screw (37) and a second accumulator (39); the electromagnetic reversing valve (36) is connected between the high-pressure channel (28) and the low-pressure channel (30); the first damping screw (35) is installed between the electromagnetic reversing valve (36) and the high-pressure channel (28); the second damping screw (37) is installed between the electromagnetic reversing valve (36) and the low-pressure channel (30); and the second accumulator (39) is connected to the high-pressure channel (28); and the controller is connected to the electromagnetic reversing valve (36).

3. A lithium battery pole piece rolling mill roll bending device, comprising a base (1), an archway (2) fixedly mounted on the base (1), and an upper roll device (20) and a lower roll device (3) mounted in the archway (2) and sliding up and down; the upper roll device (20) comprises an upper bearing seat (7), an upper roll (6) mounted in the upper bearing seat (7) through an upper bearing (19), and two roll bending cylinders (15) symmetrically arranged at the upper left and right ends of the upper bearing seat (7); the lower roll device (3) comprises a lower bearing seat (4), a lower roll (5) mounted in the lower bearing seat (4) through a lower bearing (21), and two roll bending cylinders (15) symmetrically arranged at the lower left and right ends of the lower bearing seat (4); the cylinder rod (17) of each roll bending cylinder (15) is respectively connected to the corresponding end of the corresponding bearing seat; characterized in that: A pump-controlled roll bending hydraulic system as claimed in claim 1 is arranged on the outer side of each of the roll bending cylinders (15).

4. The lithium battery pole piece rolling mill roll bending device according to claim 3, characterized in that: The roller bending cylinder (15) comprises a cylinder barrel (16) and a cylinder rod (17); a double-ear support seat (13) is fixedly arranged on the memorial arch (2); the cylinder barrel (16) is arranged on the double-ear support seat (13) via a cylinder barrel fixing pin shaft (14); and the cylinder rod (17) is installed on the end of the corresponding bearing seat via a lever fixing pin shaft (18).

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