Feeding system

Abstract

The utility model discloses a feeding system which comprises a slurry barrel and a buffer tank and further comprises two injection pumps, two switching valves and a diaphragm pump, the two switching valves correspond to the two injection pumps in a one-to-one mode, a first connector of each switching valve is communicated with a liquid outlet of the diaphragm pump through a feeding pipeline, and a second connector of each switching valve is communicated with a liquid outlet of the diaphragm pump through a discharging pipeline. A second connector of the switching valve is communicated with the buffer tank through a discharging pipeline, a third connector of the switching valve is communicated with the corresponding injection pump, a liquid inlet of the diaphragm pump is communicated with the slurry barrel through a liquid inlet pipeline, and when one injection pump conveys slurry into the coating die head through the buffer tank, the diaphragm pump is communicated with the slurry barrel through the liquid inlet pipeline. And the other injection pump can be used for supplementing the slurry, and when the slurry in one injection pump is about to be conveyed completely, the other injection pump can continue to convey the slurry into the coating die head through the buffer tank. According to the utility model, the slurry in the slurry barrel can be continuously and stably conveyed into the coating die head, the coating uniformity can be ensured, and the quality of a pole piece is improved.

Description

Technical Field

[0001] This utility model relates to the field of coating equipment technology, specifically to a feeding system. Background Technology

[0002] In the manufacturing process of lithium battery electrodes, a coating process typically involves uniformly coating a slurry containing active materials, conductive agents, and binders onto the surface of a current collector using coating equipment. The coated current collector is then heated and dried to obtain the electrode. Existing coating equipment generally uses a screw pump for feeding. The screw pump first transports the slurry from the slurry tank to a buffer tank for buffering, and then transports it through a connecting pipeline between the buffer tank and the coating die head of the coating equipment to the coating die head. The coating die head then uniformly coats the slurry onto the surface of the current collector through an extrusion coating process. The uniformity of the coating is extremely important for the quality of the electrode, therefore the stability of the screw pump feeding process is crucial. However, because the screw pump relies on the volume change of the sealed cavity formed by the screw and bushing to draw in and discharge the slurry, periodic pressure fluctuations occur. This makes it impossible to continuously and stably deliver the slurry from the slurry tank to the coating die head, compromising coating uniformity and reducing the quality of the electrode. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a feeding system that can continuously and stably transport the slurry in the slurry tank to the coating die head, which can ensure the uniformity of coating and improve the quality of the electrode sheet.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A feeding system includes a slurry tank and a buffer tank, as well as two injection pumps, two switching valves, and a diaphragm pump. The two switching valves and the two injection pumps correspond one-to-one. The first port of the switching valve is connected to the outlet of the diaphragm pump through an inlet pipe, the second port of the switching valve is connected to the buffer tank through an outlet pipe, and the third port of the switching valve is connected to the corresponding injection pump. The inlet of the diaphragm pump is connected to the slurry tank through an inlet pipe. When one injection pump delivers slurry through the buffer tank to the coating die head, the other injection pump can replenish the slurry. When the slurry in one injection pump is almost exhausted, the other injection pump can continue to deliver slurry through the buffer tank to the coating die head.

[0006] As a preferred technical solution, the feeding system also includes an installation platform, with two injection pumps and two switching valves located at the top of the installation platform.

[0007] As a preferred technical solution, the injection pump includes a syringe and an injection drive mechanism. The syringe is disposed at the top of the mounting platform and located between the corresponding switching valve and the injection drive mechanism. The outlet of the syringe faces the corresponding switching valve and is connected to the third interface of the corresponding switching valve. The injection drive mechanism is disposed at the top of the mounting platform and connected to the end of the piston rod of the syringe. The injection drive mechanism is used to drive the piston rod of the syringe to move towards or away from the corresponding switching valve.

[0008] As a preferred technical solution, the injection drive mechanism includes an injection drive motor, a lead screw, a nut, and a connecting sleeve. The injection drive motor is disposed at the top of the mounting platform. The lead screw is located between the injection drive motor and the syringe and is rotatably disposed at the top of the mounting platform. One end of the lead screw is connected to the output end of the injection drive motor. The nut is threadedly engaged with the lead screw. The connecting sleeve is annularly disposed on the outer circumference of the lead screw. The connecting sleeve is slidably disposed at the top of the mounting platform and can move relative to the mounting platform toward or away from the corresponding switching valve. One end of the connecting sleeve is connected to the nut, and the other end of the connecting sleeve is connected to the end of the piston rod of the syringe.

[0009] As a preferred technical solution, the injection driving mechanism further includes an origin photoelectric switch, an end-point photoelectric switch, and a sensing plate. A connecting block is sleeved on the outer periphery of the connecting sleeve, and the connecting block is close to one end of the connecting sleeve. The sensing plate is connected to the connecting block. The origin photoelectric switch and the end-point photoelectric switch are respectively disposed at the top of the mounting platform and are spaced apart along the length direction of the connecting sleeve. The origin photoelectric switch and the end-point photoelectric switch are respectively electrically connected to the injection driving motor and are respectively used to sense the sensing plate.

[0010] As a preferred technical solution, the injection drive mechanism further includes a grating displacement meter. The grating displacement meters of the injection drive mechanisms of the two injection pumps are slidably disposed on both sides of the mounting platform, and one end of the grating displacement meter is connected to the connecting block through a connecting seat.

[0011] As a preferred technical solution, the top of the installation platform is provided with an installation groove, the bottom of the installation groove is provided with a slide rail, the length direction of the slide rail is the same as the length direction of the connecting sleeve, and the bottom of one end of the connecting sleeve is provided with a slider, which slides in cooperation with the slide rail.

[0012] As a preferred technical solution, the syringe outlet is provided with a connecting tube, which is sealed in the third interface of the corresponding switching valve, and the syringe outlet is connected to the third interface of the corresponding switching valve through the connecting tube.

[0013] As a preferred technical solution, the feeding system further includes two switching drive mechanisms, which correspond one-to-one with two switching valves. The switching drive mechanisms are used to drive the valve stems of the corresponding switching valves to rotate.

[0014] As a preferred technical solution, the switching drive mechanism includes a switching drive motor, a drive rod, and a transmission assembly. The bottom of the mounting platform is provided with a mounting plate corresponding to the switching drive mechanism. The switching drive motor is disposed on one side of the mounting plate, and the drive rod is located below the corresponding switching valve and rotatably disposed on the other side of the mounting plate. The output end of the switching drive motor passes through a through hole in the mounting plate and is connected to one end of the drive rod via the transmission assembly. The valve stem of the switching valve passes through a through hole in the mounting platform, and the other end of the drive rod is connected to one end of the valve stem of the corresponding switching valve. The switching drive motor drives the drive rod to rotate via the transmission assembly, thereby rotating the valve stem of the corresponding switching valve. The transmission assembly includes a first bevel gear and a second bevel gear. The first bevel gear is sleeved on the outer periphery of the output end of the switching drive motor, and the second bevel gear is sleeved on the outer periphery of one end of the drive rod. The second bevel gear meshes with the first bevel gear.

[0015] The beneficial effects of this utility model are as follows: By setting up two injection pumps, two switching valves, and a diaphragm pump, the two injection pumps can work alternately. While one injection pump is delivering slurry to the coating die through the buffer tank, the other injection pump can replenish the slurry. When the slurry in one injection pump is about to be delivered, the other injection pump can continue to deliver slurry to the coating die through the buffer tank. In this way, the slurry in the slurry tank can be continuously and stably delivered to the coating die, thereby ensuring the uniformity of coating and improving the quality of the electrode. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 , Figure 2 This is a schematic diagram of the structure of a feeding system provided in one embodiment of the present invention;

[0018] Figure 3 yes Figure 1 A schematic diagram of the first angle of the feeding system consisting of two injection pumps, two switching valves, and two switching drive mechanisms.

[0019] Figure 4 yes Figure 1 A schematic diagram of the second angle of the feeding system, consisting of two injection pumps, two switching valves, and two switching drive mechanisms.

[0020] Figure 5 yes Figure 1 The diagram shows the structure of the two injection pumps and two switching drive mechanisms of the feeding system.

[0021] Figure label:

[0022] 10. Injection pump; 11. Syringe; 111. Syringe piston rod; 112. Connecting tube; 12. Syringe mounting base; 13. Injection drive motor; 131. Coupling; 14. Lead screw; 141. Lead screw bearing housing; 15. Nut; 16. Connecting sleeve; 161. Connecting piece; 162. Connecting block; 163. Support plate; 164. Mounting piece; 1641. Bending piece; 17a. Origin photoelectric switch; 17b. End point photoelectric switch; 171. Switch bracket; 18. Induction plate; 181. Induction plate mounting base; 19. Grating displacement meter; 191. Connecting base; 1911. Vertical plate; 1912. Horizontal plate; 192. 20. Slide chute; 21. Switching valve; 22. Feed pipe; 23. Discharge pipe; 24. First port of the switching valve; 25. Second port of the switching valve; 26. Valve body of the switching valve; 30. Valve stem of the switching valve; 31. Diaphragm pump; 40. Liquid inlet pipe; 50. Slurry tank; 51. Buffer tank; 60. Connecting pipe; 60. Mounting platform; 60a. Through hole of the mounting platform; 61. Mounting groove; 62. Slide rail; 63. Slider; 64. Mounting plate; 70. Switching drive mechanism; 71. Switching drive motor; 72. Drive rod; 721. Drive rod bearing seat; 731. First bevel gear; 732. Second bevel gear; 100. Coating die head. Detailed Implementation

[0023] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0024] Please refer to Figure 1 and Figure 2 An embodiment of the present invention provides a feeding system including two injection pumps 10, two switching valves 20, a diaphragm pump 30, a slurry tank 40 for holding slurry, a buffer tank 50, an installation platform 60, and two switching drive mechanisms 70.

[0025] Two switching valves 20 and two injection pumps 10 are connected in a one-to-one manner. The first port 23 of the switching valve 20 is connected to the outlet of the diaphragm pump 30 through the feed pipe 21. The second port 24 of the switching valve 20 is connected to the buffer tank 50 through the discharge pipe 22. The third port (not shown in the figure) of the switching valve 20 is connected to the corresponding injection pump 10. The inlet of the diaphragm pump 30 is connected to the slurry tank 40 through the inlet pipe 31. The buffer tank 50 is used to connect to the coating die head 100 of the coating equipment through the connecting pipe 51. The switching valve 20 is used to control the connection between the corresponding injection pump 10 and the buffer tank 50 or the outlet of the diaphragm pump 30. The diaphragm pump 30 is used to deliver the slurry in the slurry tank 40 to the injection pump 10.

[0026] Combination Figures 3 to 5 As shown, in this embodiment, both injection pumps 10 and two switching valves 20 are located at the top of the mounting platform 60.

[0027] The syringe pump 10 includes a syringe 11 and an injection drive mechanism. The syringe 11 has a conventional structure. The syringe 11 is mounted on the top of the mounting platform 60 via a syringe mount 12 and is located between the corresponding switching valve 20 and the injection drive mechanism. The outlet of the syringe 11 faces the corresponding switching valve 20 and is connected to the third interface of the corresponding switching valve 20. An injection drive mechanism is located at the top of the mounting platform 60 and connected to the end of the piston rod 111 of the syringe 11. The injection drive mechanism is used to drive the piston rod 111 of the syringe 11 to move towards or away from the corresponding switching valve 20. By moving the piston rod 111 of the syringe 11 towards the corresponding switching valve 20, the slurry in the syringe 11 can be transported to the buffer tank 50 through the outlet of the syringe 11, the corresponding switching valve 20, and the corresponding discharge pipeline 22. Then, it enters the coating die head 100 of the coating equipment through the connecting pipeline 51. The coating die head 100 can then uniformly coat the slurry on the surface of the collector. By moving the piston rod 111 of the syringe 11 away from the corresponding switching valve 20, the slurry in the slurry tank 40 can be transported to the syringe 11 through the corresponding feed pipeline 21 and the corresponding switching valve 20 under the combined action of the suction of the syringe 11 and the pumping of the diaphragm pump 30.

[0028] The injection drive mechanism includes an injection drive motor 13, a lead screw 14, a nut 15, and a connecting sleeve 16. The injection drive motor 13 is mounted on the top of the mounting platform 60 via a motor mount (not shown in the figure). The lead screw 14 is located between the injection drive motor 13 and the syringe 11 and is rotatably mounted on the top of the mounting platform 60 via a lead screw bearing seat 141. One end of the lead screw 14 is connected to the output end of the injection drive motor 13 via a coupling 131. The nut 15 is threaded into the lead screw 14. The connecting sleeve 16 is encircled on the outer circumference of the lead screw 14 and slidably mounted on the top of the mounting platform 60, and can move relative to the mounting platform 60 towards or away from the corresponding switching valve 20. One end of the connecting sleeve 16 is connected to the nut 15, and the other end of the connecting sleeve 16 is connected to the end of the piston rod 111 of the syringe 11. The injection drive motor 13 drives the lead screw 14 to rotate, thereby causing the nut 15 to move closer to or further away from the corresponding switching valve 20, and then, through the connecting sleeve 16, it can drive the piston rod 111 of the syringe 11 to move closer to or further away from the corresponding switching valve 20.

[0029] In this embodiment, the other end of the connecting sleeve 16 is provided with a connector 161, which is connected to the end of the piston rod 111 of the syringe 11.

[0030] The connecting sleeve 16 is slidably disposed at the top of the mounting platform 60. Specifically, the top of the mounting platform 60 is provided with a mounting groove 61, and the bottom of the mounting groove 61 is provided with a slide rail 62. The length direction of the slide rail 62 is the same as the length direction of the connecting sleeve 16. A slider 63 is provided at the bottom of one end of the connecting sleeve 16, and the slider 63 slides in cooperation with the slide rail 62. By placing the slide rail 62 at the bottom of the mounting groove 61, the height of the connecting sleeve 16 can be reduced, which facilitates the connection of the connecting sleeve 16 with the nut 15 and the end of the piston rod 111 of the syringe 11, and also facilitates the connection sleeve 16 to be encircled around the outer periphery of the lead screw 14.

[0031] The syringe 11 has a connecting tube 112 at its outlet. The connecting tube 112 is sealed within the third port of the corresponding switching valve 20. The outlet of the syringe 11 is connected to the third port of the corresponding switching valve 20 through the connecting tube 112. The sealing method can be, for example, an interference fit between the connecting tube 112 and the third port of the corresponding switching valve 20, or a sealing ring fitted around the outer periphery of the connecting tube 112, which abuts against the inner wall of the third port of the corresponding switching valve 20.

[0032] Furthermore, the injection drive mechanism also includes a origin photoelectric switch 17a, an end-point photoelectric switch 17b, and a sensing plate 18. A connecting block 162 is fitted around the outer periphery of the connecting sleeve 16, and the connecting block 162 is close to one end of the connecting sleeve 16. The sensing plate 18 is connected to the top of the connecting block 162 via a sensing plate mounting base 181. The origin photoelectric switch 17a and the end-point photoelectric switch 17b are respectively located on the side of the connecting sleeve 16 near the center of the mounting platform 60. The origin photoelectric switch 17a and the end-point photoelectric switch 17b are respectively mounted on the top of the mounting platform 60 via switch brackets 171 and are spaced apart along the length of the connecting sleeve 16. The origin photoelectric switch 17a and the end-point photoelectric switch 17b are electrically connected to the injection drive motor 13 and are respectively used to sense the sensing plate 18. Both the origin photoelectric switch 17a and the end-point photoelectric switch 17b are slot-type photoelectric switches, and the movement of the connecting sleeve 16 can drive the connecting block 162 and the sensing plate 18 to move synchronously. In the initial state, the position of the connecting block 162 corresponds to the position of the origin photoelectric switch 17a. The sensing plate 18 is inserted into the groove of the origin photoelectric switch 17a. After the injection drive motor 13 drives the connecting sleeve 162 and the piston rod 111 of the syringe 11 to move towards the corresponding switching valve 20, when the sensing plate 18 reaches the groove of the endpoint photoelectric switch 17b, the endpoint photoelectric switch 17b can sense the sensing plate 18 and outputs a signal to the injection drive motor 13 to control the injection drive motor 13 to stop working. In this way, the connecting sleeve 162 reaches the endpoint position. After the injection drive motor 13 drives the connecting sleeve 162 and the piston rod 111 of the syringe 11 to move away from the corresponding switching valve 20, when the sensing plate 18 reaches the groove of the origin photoelectric switch 17a, the origin photoelectric switch 17a can sense the sensing plate 18 and outputs a signal to the injection drive motor 13 to control the injection drive motor 13 to stop working. In this way, the connecting sleeve 162 reaches the starting position. The distance the connecting sleeve 16 moves can be precisely controlled by the set sensor 18, origin photoelectric switch 17a and end point photoelectric switch 17b, thereby precisely controlling the distance the piston rod 111 of the syringe 11 moves, and thus precisely controlling the amount of slurry output.

[0033] Furthermore, the injection drive mechanism also includes a grating displacement meter 19. The grating displacement meters 19 of the injection drive mechanisms of the two injection pumps 10 are slidably mounted on both sides of the mounting platform 60. One end of the grating displacement meter 19 is connected to the connecting block 162 via a connecting seat 191. The movement of the connecting sleeve 16 can drive the grating displacement meter 19 and the connecting seat 191 to move synchronously. The grating displacement meter 19 is used to monitor the distance the connecting sleeve 16 moves to determine whether the operation of the injection drive motor 13 is stable, and can be replaced in time if any abnormality occurs.

[0034] In this embodiment, two support plates 163 are respectively provided on both sides of the mounting platform 60. A mounting member 164 is provided on the side of the support plate 163 away from the mounting platform 60. The top and bottom ends of the mounting member 164 each form two L-shaped bent parts 1641, which are arranged vertically opposite each other. The top and bottom ends of the grating displacement meter 19 each have two sliding grooves 192, the length direction of which is the same as the length direction of the grating displacement meter 19. The grating displacement meters 19 of the two injection pumps 10 correspond to the two support plates 163 respectively. The two sliding grooves 192 of the grating displacement meter 19 slide and engage with the adjacent ends of the two bent parts 1641 of the corresponding support plate 163. Each support plate 163 has two mounting members 164, which are spaced apart along the length direction of the grating displacement meter 19. It can be understood that the number of mounting members 164 can be set according to actual conditions.

[0035] In this embodiment, the connecting seat 191 includes a vertical plate 1911 and a horizontal plate 1912. One end of the grating displacement meter 19 is connected to one end of the vertical plate 1911, the other end of the vertical plate 1911 is connected to one end of the horizontal plate 1912, and the other end of the horizontal plate 1912 is connected to the top end of the connecting block 162.

[0036] The switching valve 20 is an existing BV switching valve, mainly including a valve body 25, a valve core, and a valve stem 26. The valve body 25 is located at the top of the mounting platform 60. The valve body 25 has a valve cavity inside. The outer wall of the valve body 25 has a first interface 23, a second interface 24, and a third interface. The first interface 23, the second interface 24, and the third interface are all connected to the valve cavity. The valve core is rotatably fitted in the valve cavity and has a connecting channel. The connecting channel is connected to the third interface. The valve stem 26 is set through the through hole 60a of the mounting platform 60. One end of the valve stem 26 is located below the mounting platform 60, and the other end of the valve stem 26 extends into the valve cavity and is connected to the valve core. Rotation of valve stem 26 drives valve core rotation. This rotation allows the connecting channel to connect with either the first interface 23 or the second interface 24. When the connecting channel is connected to the first interface 23, the third interface can connect to the first interface 23 via the connecting channel, while the second interface 24 remains disconnected. Thus, the outlet of syringe 11 of the injection pump 10 corresponding to the switching valve 20 can connect to the diaphragm pump 3 via the third interface of the corresponding switching valve 20, the first interface 23 of the switching valve 20, and the feed line 21. When the outlet of 0 is connected, and the connecting channel is connected to the second interface 24, the third interface can be connected to the second interface 24 through the connecting channel, while the first interface 23 is in an isolated state. In this way, the outlet of the syringe 111 of the injection pump 11 corresponding to the switching valve 20 can be connected to the buffer tank 50 through the third interface of the corresponding switching valve 20, the second interface 24 of the switching valve 20, and the discharge pipeline 22. Thus, the corresponding injection pump 10 can be connected to the buffer tank 50 or to the outlet of the diaphragm pump 30 through the switching valve 20.

[0037] Two switching drive mechanisms 70 correspond one-to-one with two switching valves 20. The switching drive mechanism 70 is used to drive the valve stem 26 of the corresponding switching valve 20 to rotate, thereby driving the valve core of the corresponding switching valve 20 to rotate.

[0038] Specifically, the switching drive mechanism 70 includes a switching drive motor 71, a drive rod 72, and a transmission assembly. The bottom of the mounting platform 60 is provided with a mounting plate 64 corresponding to the switching drive mechanism 70. The switching drive motor 71 is mounted on one side of the mounting plate 64, and the drive rod 72 is located below the corresponding switching valve 20 and rotatably mounted on the other side of the mounting plate 64 via a drive rod bearing seat 721. The mounting plate 64 provides mounting support for the switching drive motor 71 and the drive rod 72. The output end of the switching drive motor 71 passes through a through hole in the mounting plate 64 and is connected to one end of the drive rod 72 via the transmission assembly. The other end of the drive rod 72 is connected to the other end of the valve stem 26 of the corresponding switching valve 20. The switching drive motor 71 drives the drive rod 72 to rotate via the transmission assembly, thereby causing the valve stem 26 of the corresponding switching valve 20 to rotate.

[0039] The transmission assembly includes a first bevel gear 731 and a second bevel gear 732. The first bevel gear 731 is sleeved on the outer periphery of the output end of the switching drive motor 71, and the second bevel gear 732 is sleeved on the outer periphery of one end of the drive rod 72. The second bevel gear 732 meshes with the first bevel gear 731. The switching drive motor 71 drives the first bevel gear 731 to rotate, which in turn drives the second bevel gear 732 to rotate, and in turn drives the drive rod 72 to rotate.

[0040] In practical operation, for ease of description, the injection pump 10 located on the left is named the first injection pump 10, the injection pump 10 located on the right is named the second injection pump 10, the switching valve 20 corresponding to the first injection pump 10 is named the first switching valve 20, and the switching valve 20 corresponding to the second injection pump 10 is named the second switching valve 20. When the syringe 11 of the first injection pump 10 is full, the piston rod 111 of the syringe 11 of the first injection pump 10 is driven by the injection drive mechanism of the first injection pump 10 to move towards the first switching valve 20. Figure 1 As shown, Figure 1 The arrows in the diagram illustrate the flow path of the slurry. The switching drive mechanism 70, corresponding to the first switching valve 20, drives the valve core of the first switching valve 20 to rotate, thus connecting the second port 24 of the first switching valve 20 with the third port of the first switching valve 20. Under the pushing action of the piston rod 111 of the syringe 11 of the first injection pump 10, the slurry located in the syringe 11 of the first injection pump 10 can be transported through the outlet of the syringe 11 of the first injection pump 10, the third port of the first switching valve 20, the second port 24 of the first switching valve 20, and the discharge pipe 22 corresponding to the first switching valve 20 to the buffer tank 50. Then, it is transported through the connecting pipe 51 to the coating die head 100, thereby enabling the slurry to be uniformly coated on the surface of the collector through the coating die head 100. Simultaneously, through the second... The injection drive mechanism of the injection pump 10 drives the piston rod 111 of the syringe 11 of the second injection pump 10 to move away from the second switching valve 20, and drives the valve core of the second switching valve 20 to rotate through the switching drive mechanism 70 corresponding to the second switching valve 20, so that the first port 23 of the second switching valve 20 is connected to the third port of the second switching valve 20. Under the combined action of the pumping of the diaphragm pump 30 and the suction of the syringe 11 of the second injection pump 20, the slurry in the slurry tank 40 can enter the syringe 11 of the second injection pump 10 through the feed pipe 21 corresponding to the second switching valve 20, the first port 23 of the second switching valve 20, the third port of the second switching valve 20, and the outlet of the syringe 11 of the second injection pump 10, thus realizing the replenishment of slurry into the syringe 11 of the second injection pump 10.

[0041] When the slurry in the syringe 11 of the first injection pump 10 is almost completely delivered, the slurry in the syringe 11 of the second injection pump 10 is simultaneously replenished. Figure 2 As shown, Figure 2 The arrows in the diagram illustrate the flow path of the slurry. The injection drive mechanism of the second injection pump 10 drives the piston rod 111 of the syringe 11 of the second injection pump 10 to move towards the second switching valve 20. The switching drive mechanism 70 corresponding to the second switching valve 20 drives the valve core of the second switching valve 20 to rotate, thus connecting the second port 24 of the second switching valve 20 with its third port. Under the pushing action of the piston rod 111 of the syringe 11 of the second injection pump 10, the slurry in the syringe 11 of the second injection pump 10 can be transported through the outlet of the syringe 11 of the second injection pump 10, the third port of the second switching valve 20, the second port 24 of the second switching valve 20, and the discharge pipe 22 corresponding to the second switching valve 20 to the buffer tank 50. Then, it is transported through the connecting pipe 51 to the coating die head 100, thereby enabling the coating die head 100 to... The slurry is evenly coated on the surface of the collector. At the same time, the piston rod 111 of the syringe 11 of the first injection pump 10 is driven to move away from the first switching valve 20 by the injection drive mechanism of the first injection pump 10. The valve core of the first switching valve 20 is driven to rotate by the switching drive mechanism 70 corresponding to the first switching valve 20, so that the first port 23 of the first switching valve 20 is connected to the third port of the first switching valve 20. Under the combined action of the pumping of the diaphragm pump 30 and the suction of the syringe 11 of the first injection pump 10, the slurry in the slurry tank 40 can enter the syringe 11 of the first injection pump 10 through the feed pipe 21 corresponding to the first switching valve 20, the first port 23 of the first switching valve 20, the third port of the first switching valve 20, and the outlet of the syringe 11 of the first injection pump 10. In this way, the slurry can be replenished into the syringe 11 of the first injection pump 10.

[0042] When the slurry in the syringe 11 of the second injection pump 10 is about to be delivered, the slurry in the syringe 11 of the first injection pump 10 is also simultaneously filled. Then, following the steps described above, the slurry is delivered to the buffer tank 50 by the first injection pump 10, and this cycle is repeated.

[0043] This invention utilizes two injection pumps 10, two switching valves 20, and a diaphragm pump 30. The two injection pumps 10 can work alternately. While one injection pump 10 is delivering slurry through the buffer tank 50 to the coating die head 100, the other injection pump 10 can replenish the slurry. When the slurry in one injection pump 10 is almost exhausted, the other injection pump 10 can continue to deliver slurry through the buffer tank 50 to the coating die head 100. In this way, the slurry in the slurry tank 40 can be continuously and stably delivered to the coating die head 100, thereby ensuring the stability of the feeding, ensuring the uniformity of the coating, and improving the quality of the electrode sheet.

[0044] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A feeding system, comprising a slurry tank and a buffer tank, characterized in that, It also includes two injection pumps, two switching valves, and a diaphragm pump. The two switching valves and the two injection pumps correspond one-to-one. The first port of the switching valve is connected to the outlet of the diaphragm pump through the feed pipe. The second port of the switching valve is connected to the buffer tank through the discharge pipe. The third port of the switching valve is connected to the corresponding injection pump. The inlet of the diaphragm pump is connected to the slurry tank through the inlet pipe. When one injection pump delivers slurry to the coating die head through the buffer tank, the other injection pump can replenish the slurry. When the slurry in one injection pump is about to be delivered, the other injection pump can continue to deliver slurry to the coating die head through the buffer tank.

2. The feeding system according to claim 1, characterized in that, The feeding system also includes an installation platform, with two injection pumps and two switching valves located at the top of the installation platform.

3. The feeding system according to claim 2, characterized in that, The injection pump includes a syringe and an injection drive mechanism. The syringe is disposed at the top of the mounting platform and located between the corresponding switching valve and the injection drive mechanism. The outlet of the syringe faces the corresponding switching valve and is connected to the third interface of the corresponding switching valve. The injection drive mechanism is disposed at the top of the mounting platform and connected to the end of the piston rod of the syringe. The injection drive mechanism is used to drive the piston rod of the syringe to move towards or away from the corresponding switching valve.

4. The feeding system according to claim 3, characterized in that, The injection drive mechanism includes an injection drive motor, a lead screw, a nut, and a connecting sleeve. The injection drive motor is located at the top of the mounting platform. The lead screw is located between the injection drive motor and the syringe and is rotatably mounted at the top of the mounting platform. One end of the lead screw is connected to the output end of the injection drive motor. The nut is threadedly engaged with the lead screw. The connecting sleeve is encircled on the outer circumference of the lead screw. The connecting sleeve is slidably mounted at the top of the mounting platform and can move relative to the mounting platform toward or away from the corresponding switching valve. One end of the connecting sleeve is connected to the nut, and the other end of the connecting sleeve is connected to the end of the piston rod of the syringe.

5. The feeding system according to claim 4, characterized in that, The injection drive mechanism further includes a origin photoelectric switch, an end photoelectric switch, and a sensing plate. A connecting block is sleeved on the outer periphery of the connecting sleeve, and the connecting block is close to one end of the connecting sleeve. The sensing plate is connected to the connecting block. The origin photoelectric switch and the end photoelectric switch are respectively disposed at the top of the mounting platform and are spaced apart along the length direction of the connecting sleeve. The origin photoelectric switch and the end photoelectric switch are respectively electrically connected to the injection drive motor and are respectively used to sense the sensing plate.

6. The feeding system according to claim 5, characterized in that, The injection drive mechanism also includes a grating displacement meter. The grating displacement meters of the injection drive mechanisms of the two injection pumps are slidably disposed on both sides of the mounting platform. One end of the grating displacement meter is connected to the connecting block through a connecting seat.

7. The feeding system according to claim 4, characterized in that, The top of the installation platform is provided with an installation groove, and the bottom of the installation groove is provided with a slide rail. The length direction of the slide rail is the same as the length direction of the connecting sleeve. A slider is provided at the bottom of one end of the connecting sleeve, and the slider slides in cooperation with the slide rail.

8. The feeding system according to claim 3, characterized in that, The syringe has a connecting tube at its outlet, which is sealed within the third port of the corresponding switching valve. The syringe outlet is connected to the third port of the corresponding switching valve through the connecting tube.

9. The feeding system according to claim 2, characterized in that, The feeding system also includes two switching drive mechanisms, which correspond one-to-one with two switching valves. The switching drive mechanisms are used to drive the valve stems of the corresponding switching valves to rotate.

10. The feeding system according to claim 9, characterized in that, The switching drive mechanism includes a switching drive motor, a drive rod, and a transmission assembly. The bottom of the mounting platform is provided with a mounting plate corresponding to the switching drive mechanism. The switching drive motor is located on one side of the mounting plate, and the drive rod is located below the corresponding switching valve and rotatably mounted on the other side of the mounting plate. The output end of the switching drive motor passes through a through hole in the mounting plate and is connected to one end of the drive rod through the transmission assembly. The valve stem of the switching valve passes through a through hole in the mounting platform, and the other end of the drive rod is connected to one end of the valve stem of the corresponding switching valve. The switching drive motor is used to drive the drive rod to rotate through the transmission assembly, thereby driving the valve stem of the corresponding switching valve to rotate. The transmission assembly includes a first bevel gear and a second bevel gear. The first bevel gear is sleeved on the outer periphery of the output end of the switching drive motor, and the second bevel gear is sleeved on the outer periphery of one end of the drive rod. The second bevel gear meshes with the first bevel gear.

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