Injection pump and battery production line

Abstract

The utility model is suitable for the technical field of coating, and provides an injection pump and a battery production line, the battery production line comprises the injection pump, and the injection pump comprises an injection cylinder, a piston assembly, a first driving mechanism and a regulation and control device. The syringe is provided with a liquid injection port and an opening. The piston assembly comprises a piston, a first piston rod and a second piston rod, the piston is contained in the syringe, one end of the first piston rod extends into the syringe through the opening and is connected with the piston to drive the piston to move, and the piston is provided with a through hole; the second piston rod is at least partially arranged in the first piston rod. The first driving mechanism is connected to the first piston rod and used for driving the whole piston assembly to move. The second piston rod is connected to the first piston rod and / or the first driving mechanism through a regulating device. The first driving mechanism drives the first piston rod to move, and under the action of the regulating device, the first piston rod and the second piston rod move relatively, so that the piston through hole is opened.

Description

Technical Field

[0001] The present application belongs to the field of coating technology, and in particular relates to an injection pump and a battery production line. Background Art

[0002] Coating is an important process in the battery production process, and it is also a key process that directly affects the safety, capacity, consistency and other performance of the battery. Coating is to transport the prepared coating liquid to the coating head through the injection pump, and then the coating head evenly, continuously or intermittently coats it on the substrate. The injection pump needs to be cleaned during the coating process. In the prior art, the cleaning agent residue in the injection pump is reduced by circulating cleaning. In this method, there will still be cleaning agent residue in the injection pump during the last cleaning, which will affect the subsequent coating formulation process. Utility Model Content

[0003] In view of this, the embodiments of the present application hope to provide a syringe pump and a battery production line, which aim to empty the residual liquid in the syringe pump as much as possible, which is conducive to improving the coating efficiency and further improving the production efficiency of battery electrodes.

[0004] In a first aspect, an embodiment of the present application provides a syringe pump, comprising:

[0005] An injection barrel having an injection port and an opening, wherein the injection port and the opening are located at two opposite ends of the injection barrel in the axial direction;

[0006] A piston assembly, comprising a piston, a first piston rod and a second piston rod, wherein the piston is accommodated in the syringe, one end of the first piston rod extends into the syringe through the opening and is connected to the piston to drive the piston to move, and the piston has a through hole; the second piston rod is at least partially disposed inside the first piston rod;

[0007] a first driving mechanism, connected to the first piston rod, for driving the overall movement of the piston assembly;

[0008] A regulating device, wherein the second piston rod is connected to the first piston rod and / or the first driving mechanism through the regulating device so that the first piston rod drives the second piston rod to move; the second piston rod can move between a first position and a second position, in the first position, the second piston rod closes the through hole, and in the second position, the second piston rod opens the through hole.

[0009] The injection pump provided in the embodiment of the present application drives the first piston rod to move through the first driving mechanism. Under the action of the regulating device, the first piston rod and the second piston rod move relative to each other to open the piston through hole, so that the liquid in the injection barrel flows out from the through hole.

[0010] In some embodiments, the second piston rod includes a rod portion and an end cover portion, the rod portion is inserted into the through hole, the end cover portion is connected to the end of the rod portion and is located on the side of the piston away from the first piston rod, and the second piston rod opens or closes the through hole through the end cover portion.

[0011] With such arrangement, when the syringe pump performs normal pumping operation, the end cover part abuts against the surface of the piston facing the injection port, thereby closing the through hole of the piston. At this time, the second piston rod, the piston and the first piston rod form a piston assembly as a whole, which moves up and down in the syringe barrel to pump the liquid. When cleaning the syringe pump, the syringe pump cyclically extracts and pumps the cleaning liquid, and repeats this process to clean the syringe pump; when the cleaning is completed, the first piston rod and the second piston rod move relative to each other, and the end cover part and the piston are separated from each other. At this time, the through hole of the piston is opened, and the residual cleaning liquid in the syringe barrel is discharged downward along the through hole under the action of gravity; thereby achieving the effect of emptying the residual cleaning liquid in the syringe pump as much as possible.

[0012] In this embodiment, the through hole guides and constrains the movement of the second piston rod, which is beneficial to maintaining the coaxiality of the first piston rod and the second piston rod. In addition, residual liquid can be discharged through the through hole, which is beneficial to a compact structure.

[0013] In some embodiments, the regulating device has a connected state and a disconnected state; when the regulating device is in the connected state, the first piston rod, the regulating device and the second piston rod form a rigid whole; when the regulating device is in the disconnected state, the second piston rod can move axially relative to the first piston rod to switch between the first position and the second position.

[0014] With such a configuration, the connection or disconnection state of the control device can be switched manually or automatically. When the control device is in the connected state, the second piston rod is connected to the first piston rod through the control device. At this time, the first drive mechanism drives the first piston rod to move, and the second piston rod moves synchronously with the first piston rod. When the control device is in the disconnected state, the control device is disconnected from the first piston rod and the first drive mechanism. At this time, the control device is only connected to the second piston rod, and the second piston rod can be pushed manually or by other means to move axially relative to the first piston rod, so that the second piston rod switches between the first position and the second position.

[0015] In some embodiments, the injection pump includes a second driving mechanism, which is connected to the regulating device and is used to drive the regulating device to move, so that the regulating device drives the second piston rod to switch between the first position and the second position.

[0016] The second driving mechanism can provide driving force for the regulating device, and the second piston rod and the first piston rod can move relative to each other or move synchronously by driving the movement of the regulating device. In this way, no human intervention is required, which is conducive to realizing automatic control of the injection pump.

[0017] In some embodiments, the first driving mechanism includes a first motor and a first moving part, the first moving part connects the first motor and the first piston rod, the first motor is used to drive the first moving part to move along an axial direction parallel to the first piston rod, and the second driving mechanism is arranged on the first moving part.

[0018] With such arrangement, the first motor provides a driving force for the first movable part to move, thereby driving the first movable part to move in an axial direction parallel to the first piston rod, thereby driving the first piston rod to move in the axial direction.

[0019] In some embodiments, the second driving mechanism includes a second motor and a second moving part, the second motor is arranged on the first moving part, and the second motor is used to drive the second moving part to move along an axial direction parallel to the first piston rod to drive the second piston rod to switch between the first position and the second position.

[0020] With such arrangement, when the syringe pump performs normal pumping operation, the second movable part is in one of the positions, and the second piston rod closes the through hole of the piston. At this time, the first piston rod, the regulating device and the second piston rod form a rigid whole and synchronously move axially to pump the liquid. When cleaning is completed, the second motor drives the second movable part to move to another position along the axial direction parallel to the first piston rod, and the second movable part drives the second piston rod to move axially relative to the first piston rod, thereby opening the through hole of the piston, and the residual liquid is discharged from the through hole under the action of gravity.

[0021] In some embodiments, the second driving mechanism further includes a commutation structure, the second motor has a rotating shaft, the rotating shaft intersects with the moving direction of the second movable part, and the commutation structure is used to convert the rotation of the rotating shaft of the second motor into axial movement of the second movable part.

[0022] With such arrangement, the rotation of the rotating shaft of the second motor is converted into the axial movement of the second moving part through the reversing structure, thereby driving the second piston rod to move axially.

[0023] In some embodiments, one end of the second movable part is connected to the second piston rod, and the other end of the second movable part is provided with a slide groove. The reversing structure includes a wheel disc and a positioning column arranged on one axial side of the wheel disc. The positioning column is eccentrically arranged with respect to the axis of the rotating shaft. The positioning column is passed through the slide groove and can move in the slide groove. The positioning column is used to drive the second movable part to move during the rotation around the axis of the rotating shaft.

[0024] When the wheel disc rotates, the wheel disc rotates with the shaft as the center, and the positioning column rotates around the shaft. During the rotation of the positioning column around the shaft, the positioning column has both displacement changes along the axial direction of the first piston rod and displacement changes perpendicular to the axial direction of the first piston rod. Therefore, the slide groove extends in a direction perpendicular to the axial direction of the first piston rod, so that the positioning column will not get stuck in the slide groove. In addition, the displacement change of the positioning column along the axial direction of the first piston rod will drive the second moving part to move axially together, so that the rotation of the shaft can be converted into the axial linear motion of the second moving part.

[0025] In some embodiments, the eccentricity between the positioning post and the rotating shaft is 2-4 mm. In this embodiment, the range of the eccentricity enables the positioning post to have a suitable movement stroke.

[0026] In some embodiments, the distance of movement of the second piston rod is not less than 6 mm. In this way, the opening of the piston through hole can be better adjusted, which is conducive to the outflow of liquid in the injection barrel.

[0027] In the second aspect, an embodiment of the present application provides a battery production line, comprising a coating cutter head and the injection pump described in any embodiment of the present application, wherein the injection pump is used to provide coating liquid to the coating cutter head, and the position of one end where the injection port of the injection barrel is located is higher than the position of the other end where the opening is located.

[0028] The battery production line provided in the embodiment of the present application adopts the above-mentioned injection pump to automatically discharge the residual liquid in the injection pump, thereby improving the coating efficiency and further improving the production efficiency of the battery pole pieces.

[0029] In some embodiments, the syringe is arranged vertically.

[0030] Such arrangement enables the through hole to be located at the lowest position of the rodless cavity of the syringe, which is conducive to draining the residual liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of the injection pump when the piston assembly of one embodiment of the present application is located at the injection port side of the injection barrel and the piston through hole is closed;

[0032] Figure 2 for Figure 1A schematic diagram from another perspective;

[0033] Figure 3 for Figure 1 Side view of

[0034] Figure 4 for Figure 3 Section view along AA;

[0035] Figure 5 for Figure 4 A local enlarged schematic diagram of point A in FIG.

[0036] Figure 6 This is a schematic diagram of the structure of a syringe pump when the piston assembly of another embodiment of the present application is located at the opening side of the syringe barrel and the piston through hole is open;

[0037] Figure 7 for Figure 6 A schematic diagram from another perspective;

[0038] Figure 8 for Figure 6 Side view of

[0039] Fig. 9 for Figure 8 Sectional view along BB;

[0040] Fig.10 for Fig. 9 A local enlarged schematic diagram of point B in FIG.

[0041] Description of reference numerals:

[0042] 1. Injection cylinder; 11. Liquid injection port; 12. Opening; 2. Piston; 3. First piston rod; 4. Second piston rod; 41. Rod portion; 42. End cover portion; 5. Through hole; 6. First driving mechanism; 61. First motor; 62. First moving portion; 7. Control device; 8. Second driving mechanism; 81. Second motor; 811. Rotating shaft; 82. Second moving portion; 821. Slide groove; 83. Reversing structure; 831. Wheel disc; 832. Positioning column; D1. Diameter of through hole; D2. Diameter of end cover portion; D3. Diameter of rod portion. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0044] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in the utility model will not be described separately.

[0045] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the specific corresponding schematic diagrams, which may be the left and right directions in normal use or not.

[0046] It should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0047] Coating is an important process in the battery production process, and it is also a key process that directly affects the safety, capacity, consistency and other performance of the battery. Coating is to transport the prepared coating liquid to the coating head through the syringe pump, and then the coating head is evenly, continuously or intermittently coated on the substrate. The syringe pump needs to be cleaned during the coating process. In the prior art, the residual cleaning agent in the syringe pump is reduced by circulating cleaning. In this method, after the last cleaning, the piston pumps the cleaning liquid out, but even if the piston moves to the limit, there will still be a part of the space between the piston and the end face of the syringe barrel, and there will still be residual cleaning agent in this space, resulting in the cleaning agent cannot be emptied, and the residual cleaning agent is easy to affect the subsequent coating formulation process.

[0048] In view of the above problems, an embodiment of the present application provides a syringe pump, including a syringe, a piston assembly, a first driving mechanism and a regulating device. The syringe has a liquid injection port and an opening, and the liquid injection port and the opening are located at opposite ends of the syringe in the axial direction. The piston assembly includes a piston, a first piston rod and a second piston rod, the piston is accommodated in the syringe, one end of the first piston rod extends into the syringe through the opening and is connected to the piston to drive the piston to move, and the piston has a through hole; the second piston rod is at least partially arranged inside the first piston rod. The first driving mechanism is connected to the first piston rod and is used to drive the overall movement of the piston assembly. The second piston rod is connected to the first piston rod and / or the first driving mechanism through the regulating device, so that the first piston rod drives the second piston rod to move; the second piston rod can move in a first position and a second position, in the first position, the second piston rod closes the through hole, and in the second position, the second piston rod opens the through hole. In this way, the first piston rod is driven to move by the first driving mechanism, and under the action of the regulating device, the first piston rod and the second piston rod move relative to each other to open the piston through hole, so that the liquid in the syringe flows out from the through hole, which is conducive to emptying the residual liquid in the syringe.

[0049] The embodiment of the present application also provides a battery production line, including a coating cutter head and a syringe pump of any embodiment of the present application. The position of the end where the injection port of the syringe is located is higher than the position of the end where the opening is located. The syringe pump is used to provide coating liquid to the coating cutter head, and the coating cutter head is used to apply the coating liquid on the pole piece or other parts to be coated.

[0050] The battery production line provided by the embodiment of the present application can automatically discharge the residual liquid in the injection pump, improve the coating efficiency, and thus improve the production efficiency of the battery. In some embodiments, the injection barrel is arranged vertically, so that the through hole is located at the lowest position of the rodless cavity of the injection barrel, which is conducive to the emptying of the residual liquid.

[0051] In some embodiments, the battery may be a power battery, such as a lithium battery, or a photovoltaic cell, such as a perovskite solar cell. In some specific embodiments, such as on a lithium battery production line, a syringe pump is used to provide a coating liquid to a coating blade, and the coating blade is used to apply the coating liquid to the electrode, for example, to prepare a positive electrode or a negative electrode. In other specific embodiments, such as on a perovskite solar cell production line, a syringe pump is used to provide a coating liquid to a coating blade, and the coating blade is used to apply a hole transport layer, a perovskite layer, an electron transport layer or other functional layers on the corresponding substrate.

[0052] In the following embodiments, for the convenience of description, a battery production line according to an embodiment of the present application is taken as an example.

[0053] The present application embodiment provides a syringe pump, see Figure 1-8The injection pump comprises a syringe 1, a piston assembly, a first driving mechanism 6 and a regulating device 7. The syringe 1 has an injection port 11 and an opening 12, and the injection port 11 and the opening 12 are located at opposite ends of the axial direction of the syringe 1. The piston assembly comprises a piston 2, a first piston rod 3 and a second piston rod 4, the piston 2 is accommodated in the syringe 1, one end of the first piston rod 3 extends into the syringe 1 through the opening 12 and is connected to the piston 2 to drive the piston 2 to move. The piston 2 has a through hole 5. The second piston rod 4 is at least partially arranged inside the first piston rod 3. The first driving mechanism 6 is connected to the first piston rod 3 and is used to drive the overall movement of the piston assembly. The second piston rod 4 is connected to the first piston rod 3 and / or the first driving mechanism 6 through the regulating device 7, so that the first piston rod 3 drives the second piston rod 4 to move; the second piston rod 4 can move in a first position and a second position, in the first position, the second piston rod 4 closes the through hole 5, and in the second position, the second piston rod 4 opens the through hole 5.

[0054] The syringe 1 is the barrel part of the syringe pump. The syringe pump realizes the extraction and injection of liquid through the cooperation of the syringe 1 and the piston 2. The inner wall of the syringe 1 is smooth to reduce the resistance of the piston 2. The material of the syringe 1 can be glass, plastic, etc.

[0055] The piston 2 is a key component of the syringe pump. The piston 2 divides the space in the syringe barrel 1 into a rod chamber and a rodless chamber, wherein the injection port 11 is always connected to the rodless chamber, the opening 12 is always connected to the rod chamber, and the first piston rod 3 and the second piston rod 4 are both located in the rod chamber. When the syringe pump is working normally, when the piston 2 moves toward one end of the opening 12, the rodless chamber generates negative pressure, and the external liquid is sucked into the rodless chamber under the action of the negative pressure. Thereafter, when the piston 2 moves toward the direction of the injection port 11, the piston 2 pushes the liquid, thereby pumping the liquid out from the injection port 11.

[0056] It should be noted that the second piston rod 4 can move between the first position and the second position, which refers to the position of the second piston rod 4 relative to the first piston rod 3. Specifically, when the two need to produce relative movement, the second piston rod 4 can remain stationary and the first piston rod 3 moves, or the first piston rod 3 can remain stationary and the second piston rod 4 moves.

[0057] The first driving mechanism 6 drives the first piston rod 3 and the piston 2 to move. The driving mode of the power source of the driving mechanism is not limited, for example, including but not limited to: motor drive, pneumatic drive and hydraulic drive, etc.

[0058] In the injection pump of the embodiment of the present application, when performing normal pumping operation, the control device 7 directly or indirectly connects the first piston rod 3 and the second piston rod 4 together to form a rigid whole, and any part of the rigid whole will not move relative to each other. The second piston rod 4 closes the through hole 5 of the piston 2, and the first driving mechanism 6 drives the above-mentioned rigid whole to reciprocate to pump liquid.

[0059] When cleaning the syringe pump, the syringe barrel 1 extracts and pumps the cleaning liquid. After one or more extractions and pumpings of the cleaning liquid, after the last pumping of the cleaning liquid, the piston 2 moves to Figure 4 and Figure 5 After that, the first driving mechanism 6 drives the piston 2 to move to the desired position in the direction of the opening 12. At this time, the regulating device 7 is operated to make the first piston rod 3 and the second piston rod 4 move relative to each other. Fig. 9 and Fig.10 , the second piston rod 4 opens the through hole 5 of the piston 2. At this time, the residual cleaning liquid in the rodless cavity of the syringe is discharged along the through hole 5 under the action of gravity. After the residual cleaning liquid is discharged, the regulating device 7 is operated to reset the first piston rod 3 and the second piston rod 4. The regulating device 7 directly or indirectly connects the first piston rod 3 and the second piston rod 4 into a rigid whole. The second piston rod 4 closes the through hole 5 of the piston 2 to facilitate the next pumping work.

[0060] The syringe pump of the embodiment of the present application is conducive to emptying the residual liquid in the syringe barrel 1.

[0061] In some embodiments, the second piston rod 4 includes a rod portion 41 and an end cover portion 42. The rod portion 41 is inserted into the through hole 5. The end cover portion 42 is connected to the end of the rod portion 41 and is located on the side of the piston 2 away from the first piston rod 3. The second piston rod 4 opens or closes the through hole 5 through the end cover portion 42.

[0062] The diameter D2 of the end cover portion is smaller than the diameter of the syringe 1 , and the diameter D3 of the stem portion is smaller than the diameter D1 of the through hole.

[0063] With such arrangement, when the syringe pump performs normal pumping operation, the end cover 42 abuts against the surface of the piston 2 facing the injection port 11, thereby closing the through hole 5 of the piston 2. At this time, the second piston rod 4, the piston 2 and the first piston rod 3 form a piston assembly as a whole, which moves up and down in the syringe 1 to pump liquid. When cleaning the syringe pump, the syringe pump circulates to extract and pump the cleaning liquid, and repeats this process to clean the syringe pump; when the cleaning is completed, the first piston rod 3 and the second piston rod 4 move relative to each other, and the end cover 42 and the piston 2 are separated from each other. At this time, the through hole 5 of the piston 2 is opened, and the residual cleaning liquid in the syringe is discharged downward along the through hole 5 under the action of gravity; thereby achieving the effect of emptying the residual cleaning liquid in the syringe pump as much as possible.

[0064] In this embodiment, the through hole 5 guides and constrains the movement of the second piston rod 4, which is beneficial to maintaining the coaxiality of the first piston rod 3 and the second piston rod 4. In addition, residual liquid can be discharged through the through hole 5, which is beneficial to a compact structure.

[0065] In some embodiments, the entire second piston rod 4 is located on the side of the piston 2 facing the opening 12 , and the end of the second piston rod 4 is used to block or open the through hole 5 .

[0066] In other embodiments, a through hole may also be provided on the piston, the through hole and the through hole 5 are arranged at intervals, the rod portion 41 of the second piston rod 4 is inserted into the through hole and dynamically seals with the hole wall of the through hole, and the end cover portion is used to open or close the through hole 5. In other words, no matter how the second piston rod 4 moves, the residual liquid will never be discharged from the through hole.

[0067] In some embodiments, the regulating device 7 has a connected state and a disconnected state; when the regulating device 7 is in the connected state, the first piston rod 3, the regulating device 7 and the second piston rod 4 form a rigid whole; when the regulating device 7 is in the disconnected state, the second piston rod 4 can move axially relative to the first piston rod 3 to switch between the first position and the second position.

[0068] The switching mode between the connected state and the disconnected state of the regulating device 7 can be manual switching or automatic switching.

[0069] A rigid whole is a whole structure with rigid characteristics. A rigid whole is not easily deformed, can maintain the stability of its shape and size, and deforms less when subjected to external forces; at the same time, a rigid whole can withstand large loads or forces without being damaged; in addition, there is no relative movement between the parts of a rigid whole.

[0070] With such a configuration, the connection or disconnection state of the regulating device 7 can be switched manually or automatically. When the regulating device 7 is in the connected state, the second piston rod 4 is connected to the first piston rod 3 through the regulating device 7. At this time, the first driving mechanism 6 drives the first piston rod 3 to move, and the second piston rod 4 moves synchronously with the first piston rod 3. When the regulating device 7 is in the disconnected state, the regulating device 7 is disconnected from the first piston rod 3 and the first driving mechanism 6. At this time, the regulating device 7 is only connected to the second piston rod 4, and the second piston rod 4 can be pushed manually or by other means to perform axial movement relative to the first piston rod 3, so that the second piston rod 4 switches between the first position and the second position.

[0071] In some embodiments, the injection pump includes a second driving mechanism 8, which is connected to the regulating device 7 and is used to drive the regulating device 7 to move, so that the regulating device 7 drives the second piston rod 4 to switch between the first position and the second position.

[0072] The second driving mechanism 8 can provide driving force for the regulating device 7, and drive the movement of the regulating device 7 to cause relative movement or synchronous movement between the second piston rod 4 and the first piston rod 3. In this way, no human intervention is required, which is conducive to realizing automatic control of the injection pump.

[0073] In some embodiments, the first driving mechanism 6 includes a first motor 61 and a first moving part 62, the first moving part 62 connects the first motor 61 and the first piston rod 3, the first motor 61 is used to drive the first moving part 62 to move along an axial direction parallel to the first piston rod 3, and the second driving mechanism 8 is disposed on the first moving part 62. That is, when the first moving part 62 moves, the first moving part 62 will drive the second driving mechanism 8 to move together.

[0074] A motor is a device that converts electrical energy into mechanical energy. Types of motors include DC motors, AC motors, synchronous motors, asynchronous motors, etc.

[0075] It should be noted that the first motor 61 can also be understood as a linear motor, and the power output by the first motor is used to make the first moving part 62 move in a straight line.

[0076] With such arrangement, the first motor 61 provides a driving force for the first movable portion 62 to move, thereby driving the first movable portion 62 to move in an axial direction parallel to the first piston rod 3 , thereby driving the first piston rod 3 to move in the axial direction.

[0077] In some embodiments, the second driving mechanism 8 includes a second motor 81 and a second movable part 82. The second motor 81 is arranged on the first movable part 62. The second motor 81 is used to drive the second movable part 82 to move along an axial direction parallel to the first piston rod 3 to drive the second piston rod 4 to switch between the first position and the second position.

[0078] With such arrangement, when the syringe pump performs normal pumping operation, the second movable portion 82 is in one of the positions, and the second piston rod 4 closes the through hole 5 of the piston 2. At this time, the first piston rod 3, the regulating device 7 and the second piston rod 4 form a rigid whole and synchronously move axially to pump liquid. When cleaning is completed, the second motor 81 drives the second movable portion 82 to move to another position along the axial direction parallel to the first piston rod 3, and the second movable portion 82 drives the second piston rod 4 to move axially relative to the first piston rod 3, thereby opening the through hole 5 of the piston 2, and the residual liquid is discharged from the through hole 5 under the action of gravity.

[0079] In some embodiments, the second driving mechanism 8 also includes a reversing structure 83, the second motor 81 has a rotating shaft 811, the rotating shaft 811 intersects with the moving direction of the second movable part 82, and the reversing structure 83 is used to convert the rotation of the rotating shaft 811 of the second motor 81 into the axial movement of the second movable part 82.

[0080] The reversing structure 83 is a structure for converting rotation into linear motion. The specific form of the reversing structure 83 is not limited, for example, a gear rack, a lead screw nut, a cam mechanism, etc.

[0081] With such arrangement, the rotation of the rotating shaft 811 of the second motor 81 is converted into the axial movement of the second moving part 82 through the reversing structure 83, thereby driving the second piston rod 4 to move axially.

[0082] In some embodiments, one end of the second movable part 82 is connected to the second piston rod 4, and the other end of the second movable part 82 is provided with a slide groove 821. The reversing structure 83 includes a wheel disc 831 and a positioning column 832 arranged on one axial side of the wheel disc 831. The positioning column 832 is eccentrically arranged with respect to the axis of the rotating shaft 811. The positioning column 832 is penetrated in the slide groove 821 and can move in the slide groove 821. The positioning column 832 is used to drive the second movable part 82 to move linearly during the process of rotating around the axis of the rotating shaft 811. When the wheel disc 831 rotates, the wheel disc 831 rotates around the rotating shaft 811, and the positioning column 832 rotates around the rotating shaft 811. During the rotation of the positioning column 832 around the rotating shaft 811, the positioning column 832 has both displacement changes along the axial direction of the first piston rod 4 and displacement changes perpendicular to the axial direction of the first piston rod 4. Therefore, the slide groove 821 extends in the axial direction perpendicular to the first piston rod 4, so that the positioning column 832 will not get stuck in the slide groove 821. In addition, the displacement change of the positioning column 832 along the axial direction of the first piston rod 4 will drive the second movable part 82 to move axially together. In this way, the rotation of the rotating shaft 811 can be converted into the axial linear motion of the second movable part 82.

[0083] In this embodiment, the steering structure 83 has a simple structure, is not prone to getting stuck, and has high reliability.

[0084] In some embodiments, the eccentric distance between the positioning post 832 and the rotating shaft 811 is 2-4 mm (millimeter), for example, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, etc.

[0085] The eccentricity refers to the distance between the axis of the positioning column 832 and the axis of the rotating shaft 811 .

[0086] In this embodiment, the range of the eccentricity enables the positioning column 831 to have a suitable movement stroke.

[0087] In some embodiments, the distance of movement of the second piston rod 4 is no more than 6 mm, for example, 6 mm, 5 mm, 4 mm, 3 mm, 2 mm, etc. In this way, the opening of the through hole 5 of the piston 2 can be better adjusted, which is conducive to the outflow of the liquid in the syringe 1.

[0088] A specific embodiment of the present application is briefly described below in conjunction with the accompanying drawings.

[0089] The injection pump comprises a syringe 1 , a piston assembly, a first drive mechanism 6 , a regulating device 7 and a second drive mechanism 8 .

[0090] The piston assembly includes a piston 2, a first piston rod 3 and a second piston rod 4. The second piston rod 4 includes a rod portion 41 and an end cover portion 42. The piston 2 has a through hole 5. The rod portion 41 is inserted into the through hole 5, and the end cover portion 42 is located on the side of the piston facing the injection port.

[0091] The first driving mechanism 6 includes a first motor 61 and a first moving part 62 .

[0092] The second driving mechanism 8 includes a second motor 81, a second moving part 82 and a reversing structure 83. The reversing structure 83 includes the above-mentioned wheel disc 831 and positioning column 832.

[0093] The working principle and process are as follows: when the syringe pump performs normal pumping operation, the end cover 42 contacts the piston 2 to close the through hole 5 of the piston 2, the first piston rod 3, the regulating device 7, the second driving mechanism 8, the first moving part 62, and the second piston rod 4 form a rigid whole, and the first motor 61 drives the first moving part 62 to reciprocate linearly, thereby driving the rigid whole to synchronously move axially through the first moving part 62 to pump liquid. It should be noted that when the syringe pump is pumping the working medium or the cleaning liquid, the working process and principle are basically the same.

[0094] When the injection pump finishes pumping the cleaning liquid (i.e., the last time the cleaning liquid is pumped), the second motor 81 controls the rotating shaft 811 to move along the Figure 7 The disc wheel 831 drives the positioning column 832 to rotate clockwise by a preset angle. Figure 7 The second motor 81 controls the rotating shaft 811 to move along the direction of the injection port 11, and the second motor 81 controls the rotating shaft 811 to move along the direction of the injection port 11, so that the end cover 42 is separated from the piston 2, thereby opening the through hole 5 of the piston 2, and the residual liquid is discharged from the through hole 5 under the action of gravity. In this way, the residual liquid in the injection pump can be emptied to a greater extent. After the residual liquid is emptied, the second motor 81 controls the rotating shaft 811 to move along the direction of the injection port 11, and ... Figure 7 The counterclockwise direction of the disk wheel 831 rotates a preset angle, so that the disk wheel 831 drives the positioning column 832 to move along the Figure 7The second moving part 82 is rotated counterclockwise, so that the positioning column 832 drives the second moving part 82 to move a short distance away from the liquid injection port 11, so that the end cover part 42 is attached to the surface of the piston 2, thereby closing the through hole 5.

[0095] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0096] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A syringe pump, characterized in that: include: An injection barrel having an injection port and an opening, wherein the injection port and the opening are located at two opposite ends of the injection barrel in the axial direction; A piston assembly, comprising a piston, a first piston rod and a second piston rod, wherein the piston is accommodated in the syringe, one end of the first piston rod extends into the syringe through the opening and is connected to the piston to drive the piston to move, and the piston has a through hole; the second piston rod is at least partially disposed inside the first piston rod; a first driving mechanism, connected to the first piston rod, for driving the overall movement of the piston assembly; A regulating device, wherein the second piston rod is connected to the first piston rod and / or the first driving mechanism through the regulating device so that the first piston rod drives the second piston rod to move; the second piston rod can move between a first position and a second position, in the first position, the second piston rod closes the through hole, and in the second position, the second piston rod opens the through hole.

2. The injection pump according to claim 1, characterized in that The second piston rod includes a rod portion and an end cover portion, the rod portion is inserted into the through hole, the end cover portion is connected to the end of the rod portion and is located on the side of the piston away from the first piston rod, and the second piston rod opens or closes the through hole through the end cover portion.

3. The injection pump according to claim 1, characterized in that The regulating device has a connected state and a disconnected state; when the regulating device is in the connected state, the first piston rod, the regulating device and the second piston rod form a rigid whole; When the regulating device is in the disconnected state, the second piston rod can move axially relative to the first piston rod to switch between the first position and the second position.

4. The injection pump according to claim 1, characterized in that The injection pump comprises a second driving mechanism, which is connected to the regulating device and is used to drive the regulating device to move, so that the regulating device drives the second piston rod to switch between the first position and the second position.

5. The injection pump according to claim 4, characterized in that: The first driving mechanism includes a first motor and a first moving part, the first moving part connects the first motor and the first piston rod, the first motor is used to drive the first moving part to move along an axial direction parallel to the first piston rod, and the second driving mechanism is arranged on the first moving part.

6. The injection pump according to claim 5, characterized in that The second driving mechanism includes a second motor and a second moving part. The second motor is arranged on the first moving part. The second motor is used to drive the second moving part to move along an axial direction parallel to the first piston rod to drive the second piston rod to switch between the first position and the second position.

7. The injection pump according to claim 6, characterized in that: The second driving mechanism further includes a commutation structure, the second motor has a rotating shaft, the rotating shaft intersects with the moving direction of the second moving part, and the commutation structure is used to convert the rotation of the rotating shaft of the second motor into the axial movement of the second moving part.

8. The injection pump according to claim 7, characterized in that: One end of the second movable part is connected to the second piston rod, and the other end of the second movable part is provided with a slide groove. The reversing structure includes a wheel disc and a positioning column arranged on one axial side of the wheel disc. The positioning column is eccentrically arranged with respect to the axis of the rotating shaft. The positioning column is penetrated in the slide groove and can move in the slide groove. The positioning column is used to drive the second movable part to move during the rotation around the axis of the rotating shaft.

9. The injection pump according to claim 8, characterized in that The eccentric distance between the positioning column and the rotating shaft is 2-4 mm.

10. The injection pump according to claim 8, characterized in that The distance that the second piston rod moves is no more than 6 mm.

11. A battery production line, characterized in that: It comprises a coating cutter head and the injection pump according to any one of claims 1 to 10, wherein the injection pump is used to provide coating liquid to the coating cutter head, and the position of one end of the injection port of the injection barrel is higher than the position of the other end where the opening is located.

12. The battery production line according to claim 11, characterized in that: The injection cylinder is arranged vertically.

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