Pressing mechanism

Abstract

The utility model relates to the technical field of lithium battery coating systems, in particular to a material pressing mechanism. The material pressing mechanism is used for extruding slurry in a buffer tank, a tank opening is formed in the top of the buffer tank, a discharging opening is formed in the bottom of the buffer tank, and the material pressing mechanism comprises a driver, a material pressing piece and a rack; the driver is arranged on the rack, and the material pressing piece is connected to the driver; the material pressing piece can stretch into the buffer tank through the tank opening, and the driver is used for driving the material pressing piece to move so as to extrude slurry in the buffer tank towards the discharging opening and discharge the slurry from the discharging opening. The driver drives the material pressing piece to move to extrude the slurry in the buffer tank towards the discharging opening and discharge the slurry, the extrusion force of the material pressing piece is controlled through the driver, the flow of the extruded slurry can be controlled, the uniformity of the flow of the slurry is guaranteed, meanwhile, the high-solid-content slurry can be continuously supplied and conveyed, and the coating effect and stability are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery coating system technical field especially is related to a material pressing mechanism. BACKGROUND

[0002] Coating is one of the key processes of producing lithium battery pole piece. The main purpose of this process is to uniformly coat the slurry with high solid content, good viscosity and good fluidity on the positive and negative pole pieces through the die. For the same process formula, the greater the solid content of the slurry, the greater the viscosity. Within a certain range, the higher the solid content of the slurry, the thicker the coating on the pole piece, and the higher the battery capacity. When the coating thickness is constant, increasing the solid content of the slurry can shorten the drying time in the oven, reduce the number of ovens and save energy.

[0003] The solid content of the existing electrode slurry is about 50%. When the solid content of the electrode slurry is increased to more than 60%, the slurry is similar to a semi-solid mud, and the fluidity of the slurry is significantly reduced.

[0004] For high solid content slurry, the fluidity of the slurry is reduced when the solid content is increased, which to some extent increases the difficulty of slurry conveying. Due to the poor fluidity of high solid content slurry, it is difficult to realize continuous feeding of the slurry by relying solely on the flow of the slurry in the cavity. SUMMARY

[0005] The utility model aims at providing a material pressing mechanism to solve the technical problem that the fluidity of high solid content slurry is poor, and it is difficult to realize continuous feeding of the slurry by relying solely on the flow of the slurry in the cavity.

[0006] In the first aspect, the utility model provides a material pressing mechanism for extruding the slurry in the buffer tank, the top of the buffer tank is provided with a tank opening, the bottom of the buffer tank is provided with a discharge port, and the material pressing mechanism comprises a driver, a material pressing piece and a rack.

[0007] The driver is arranged on the rack, and the material pressing piece is connected to the driver.

[0008] The material pressing piece can extend into the buffer tank through the tank opening, and the driver is used for driving the material pressing piece to move so as to extrude the slurry in the buffer tank to the discharge port and discharge the slurry from the discharge port.

[0009] In an optional embodiment, the driver comprises an electric cylinder, and the material pressing piece comprises a piston.

[0010] The output end of the electric cylinder is connected to the piston.

[0011] In an optional embodiment, a sealing ring is further included.

[0012] The outer edge of the piston is provided with a mounting groove, and the sealing ring is sleeved in the mounting groove.

[0013] In an optional embodiment, the piston comprises an upper plug body, a middle plug body and a lower plug body along the axial direction of the piston.

[0014] The middle part of the middle plug body is provided with an upper protrusion, the upper plug body is sleeved on the upper protrusion and connected to the upper side of the middle plug body, and the lower plug body is connected to the lower side of the middle plug body.

[0015] Along the radial direction of the piston, the outer edge of the middle plug body is lower than the outer edges of the upper plug body and the lower plug body, so that the mounting groove is formed between the upper plug body, the middle plug body and the lower plug body.

[0016] In an optional embodiment, the piston further comprises a compression ring.

[0017] The compression ring is arranged in the mounting groove, and the compression ring is used to compress the sealing ring so that the sealing ring protrudes outward along the radial direction of the piston.

[0018] In an optional embodiment, a buffer tank positioning plate is further included, the output end of the electric cylinder is arranged through the buffer tank positioning plate, and the piston is located on the side of the buffer tank positioning plate away from the electric cylinder.

[0019] The side of the buffer tank positioning plate away from the electric cylinder is provided with a positioning pin, the tank opening is provided with a pin hole corresponding to the positioning pin, and the positioning pin is arranged in the pin hole.

[0020] In an optional embodiment, an exhaust pipe is further included, and the piston is provided with an exhaust port along the axial direction of the piston.

[0021] The exhaust pipe is in communication with the exhaust port, and the exhaust pipe is provided with an exhaust valve.

[0022] In an optional embodiment, a guide column is further included, the rack is provided with a guide hole, one end of the guide column is connected to the side of the piston facing the electric cylinder, and the other end of the guide column is arranged through the guide hole.

[0023] In an optional embodiment, a jacking member is further included, the buffer tank is transported by a transfer trolley, and the transfer trolley can enter and exit the rack.

[0024] The jacking member is arranged on the rack and is used to lift the buffer tank to take the buffer tank off the transfer trolley and place the buffer tank on the rack, or take the buffer tank off the rack and place the buffer tank on the transfer trolley.

[0025] In an optional embodiment, a positioning member is further included, which is arranged at the output end of the jacking member;

[0026] The supporting seat is arranged on the buffer tank, and the supporting seat is provided with a positioning hole, the positioning member is correspondingly matched with the positioning hole, and the positioning member is used for being inserted into the positioning hole.

[0027] Compared with the prior art, the technical advantage of the pressing mechanism provided by the utility model is that:

[0028] The pressing mechanism provided by the utility model is used for extruding slurry in a buffer tank, the top of the buffer tank is provided with a tank opening, the bottom of the buffer tank is provided with a discharge opening, and the pressing mechanism comprises a driver, a pressing member and a rack; the driver is arranged on the rack, and the pressing member is connected to the driver; the pressing member can extend into the buffer tank through the tank opening, and the driver is used for driving the pressing member to move, so that the slurry in the buffer tank is extruded to the discharge opening and is discharged from the discharge opening.

[0029] The driver extrudes and discharges the slurry in the buffer tank to the discharge opening by driving the pressing member to move, the extrusion force of the pressing member is controlled by the driver, the flow of the extruded slurry can be controlled to ensure the uniformity of the slurry flow, and the high solid content slurry can be continuously supplied to ensure the effect and stability during coating.

[0030] Other features and advantages of the utility model will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0032] Figure 1 The side structure schematic view of the pressing mechanism provided by the utility model embodiment is shown in the figure.

[0033] Figure 2 The other side structure schematic view of the pressing mechanism provided by the utility model embodiment is shown in the figure.

[0034] Figure 3 The structure schematic view of the transfer trolley provided by the utility model embodiment is shown in the figure.

[0035] Figure 4 The piston structure schematic view provided by the utility model embodiment is shown in the figure.

[0036] Figure 5The utility model discloses a cross section view of cylinder and support seat.

[0037] Icon: 1 - buffer tank;2 - rack;3 - electric cylinder;4 - piston;5 - sealing ring;6 - upper plug body;7 - middle plug body;8 - lower plug body;9 - upper convex part;10 - compression ring;11 - buffer tank positioning plate;12 - positioning pin;13 - pin hole;14 - exhaust pipe;15 - exhaust port;16 - guide column;17 - transfer trolley;18 - positioning piece;19 - support seat;20 - positioning hole;21 - cylinder;22 - fixed plate. DETAILED DESCRIPTION

[0038] The technical scheme of the utility model will be described below in connection with the embodiments, and obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0039] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0041] In addition, the technical scheme of each embodiment can be combined with each other, but it must be based on that the ordinary skilled in the art can realize, when the combination of technical schemes appears contradictory or unachievable, it should be considered that the combination of technical schemes does not exist, also not in the protection scope required by the utility model.

[0042] The utility model will be further described in detail below through specific embodiment and in connection with the drawings.

[0043] The specific structure is as shown in Figures 1 to 5

[0044] The embodiment provides a pressing mechanism for extruding slurry in a buffer tank 1, the top of the buffer tank 1 is provided with a tank opening, the bottom of the buffer tank 1 is provided with a discharge opening, and the pressing mechanism comprises a driver, a pressing piece and a rack 2; the driver is arranged on the rack 2, and the pressing piece is connected to the driver; the pressing piece can extend into the buffer tank 1 through the tank opening, and the driver is used for driving the pressing piece to move so as to extrude the slurry in the buffer tank 1 to the discharge opening and discharge the slurry from the discharge opening.

[0045] In the embodiment, the driver extrudes and discharges the slurry in the buffer tank 1 by driving the pressing piece to move, the extrusion force of the pressing piece controlled by the driver can not only control the flow of the extruded slurry to ensure the uniformity of the slurry flow, but also can continuously supply the slurry with high solid content, thereby ensuring the effect and stability during coating.

[0046] In an optional technical solution of the embodiment, the driver comprises a rotary motor, the pressing piece comprises a screw rod, the screw rod is connected to the rotary motor, the screw rod extends into the buffer tank 1 through the tank opening, the rotary motor drives the screw rod to rotate and extrude the slurry downward, so that the slurry is discharged from the discharge opening, and the structure is simple and the extrusion effect of the slurry is good. In order to facilitate the screw rod to enter and exit the tank opening, the driver can further comprise a telescopic motor, the output end of the telescopic motor is connected to the rotary motor, the telescopic motor drives the rotary motor to ascend and descend through a telescopic belt, and in turn drives the screw rod to enter and exit the tank opening. It should be noted that the telescopic motor can not work, that is, does not drive the screw rod to make ascending and descending actions when the screw rod extrudes the slurry.

[0047] In an optional technical solution of the embodiment, the driver comprises an electric cylinder 3, and the pressing piece comprises a piston 4.

[0048] In the embodiment, the electric cylinder 3 drives the piston 4 to move to extrude the slurry, which can better control the flow of the extruded slurry, ensure the uniformity of the slurry flow, and further improve the effect and stability during coating.

[0049] Specifically, the rack 2 is provided with a fixed plate 22, the electric cylinder 3 is fixed on the fixed plate 22, and the output end of the electric cylinder 3 penetrates through the fixed plate 22 and is connected to the piston 4.

[0050] In an optional technical solution of the embodiment, a sealing ring 5 is further included, an installation groove is arranged on the outer edge of the piston 4, and the sealing ring 5 is sleeved on the installation groove. In the process that the piston 4 extrudes the slurry downward, the sealing ring 5 can play a sealing role to prevent the slurry from overflowing from the outer edge of the piston 4.

[0051] In an optional technical solution of the embodiment, the piston 4 can be integrally formed, which is convenient to manufacture and stable in structure.

[0052] ​Preferably, along the axial direction of the piston 4, the piston 4 comprises the upper plug body 6, the middle plug body 7 and the lower plug body 8; the middle part of the middle plug body 7 is provided with the upper protrusion 9, the upper plug body 6 is sleeved on the upper protrusion 9 and connected to the upper side of the middle plug body 7, and the lower plug body 8 is connected to the lower side of the middle plug body 7; along the radial direction of the piston 4, the outer edge of the middle plug body 7 is lower than the outer edges of the upper plug body 6 and the lower plug body 8, so as to form the mounting groove between the upper plug body 6, the middle plug body 7 and the lower plug body 8. The structure is simple and convenient for installing the sealing ring 5.

[0053] In an optional technical solution of the embodiment, the piston 4 further comprises the compression ring 10; the compression ring 10 is arranged in the mounting groove, and the compression ring 10 is used to compress the sealing ring 5 so that the sealing ring 5 protrudes outward along the radial direction of the piston 4.

[0054] In the embodiment, the piston 4 is provided with the upper plug body 6, the middle plug body 7 and the lower plug body 8 to facilitate the installation of the sealing ring 5 and the compression ring 10; the compression ring 10 is used to increase the compression amount of the sealing ring 5; when the compression amount of the sealing ring 5 is insufficient, the gap between the piston 4 and the buffer tank 1 is large, and the extrusion feeding effect is poor; at this time, the compression ring 10 is added to increase the compression amount and reduce the gap between the sealing ring 5 and the buffer tank 1. The lower plug body 8 is in contact with the slurry; the material of the lower plug body 8 can be stainless steel or non-metallic material, such as rubber; the rubber is elastic and deforms elastically when being extruded downward, so that a sealing effect can be achieved; the sealing ring 5 can not be arranged, and the lower plug body 8 is arranged in a split manner to facilitate replacement.

[0055] In the embodiment, the upper plug body 6, the middle plug body 7, the lower plug body 8 and the compression ring 10 are connected by screws, which is stable and convenient.

[0056] In an optional technical solution of the embodiment, the buffer tank positioning plate 11 is further included; the output end of the electric cylinder 3 is arranged through the buffer tank positioning plate 11, and the piston 4 is located on the side of the buffer tank positioning plate 11 away from the electric cylinder 3; the side of the buffer tank positioning plate 11 away from the electric cylinder 3 is provided with the positioning pin 12, the tank opening is provided with the pin hole 13 corresponding to the positioning pin 12, and the positioning pin 12 is arranged in the pin hole 13.

[0057] Specifically, the buffer tank positioning plate 11 is located between the fixed plate 22 and the piston 4, and is used to correct the coaxiality between the piston 4 and the buffer tank 1. The side of the buffer tank positioning plate 11 facing the piston 4 is provided with a groove matching the top of the piston 4 in size. When the electric cylinder 3 is in the initial position, the top of the piston 4 is embedded in the groove, and at the same time the piston 4 provides support force for the buffer tank positioning plate 11, so that the buffer tank positioning plate 11 is suspended. When the piston 4 needs to extrude the slurry, the electric cylinder 3 drives the piston 4 to move downward, at this time the buffer tank positioning plate 11 will also move downward due to gravity, until the positioning pin 12 on the buffer tank positioning plate 11 is inserted into the pin hole 13, at this time the buffer tank positioning plate 11 covers the tank opening, and when the electric cylinder 3 drives the piston 4 to continue to move downward, the piston 4 extends into the buffer tank 1 to extrude the slurry. The positioning pin 12 and the pin hole 13 cooperate to position the buffer tank 1, so as to ensure the coaxiality between the piston 4 and the buffer tank 1 during the downward movement of the piston 4. Since there is a few millimeter error in the coaxiality between the piston 4 and the buffer tank 1 during installation, the bottom of the positioning pin 12 is conical, and the error can be automatically corrected and fixed with the pin hole 13. At this time, the piston 4 avoids the error under the action of the buffer tank positioning plate 11, so as to ensure the coaxiality with the buffer tank 1 and improve the extrusion feeding quality.

[0058] In an optional technical solution of the embodiment, an exhaust pipe 14 is further included, which is along the axial direction of the piston 4, and the piston 4 is provided with an exhaust port 15; the exhaust pipe 14 is in communication with the exhaust port 15, and the exhaust pipe 14 is provided with an exhaust valve.

[0059] Specifically, one end of the exhaust pipe 14 is connected to the exhaust port 15, the other end of the exhaust pipe 14 penetrates through the buffer tank positioning plate 11 and the fixed plate 22 and is provided with an exhaust valve. When the exhaust valve is opened and the electric cylinder 3 is pressed downward, if slurry appears in the exhaust valve, it proves that the excess air has been exhausted, and the exhaust valve is closed. Then, according to the coating speed, the pushing force of the electric cylinder 3 is controlled to ensure the uniformity of the extruded slurry flow. The exhaust valve is a ball valve, but it is not limited to this, and other valve bodies that meet the requirements can also be used.

[0060] In an optional technical solution of the embodiment, a guide column 16 is further included, the rack 2 is provided with a guide hole, one end of the guide column 16 is connected to the side of the piston 4 facing the electric cylinder 3, and the other end of the guide column 16 penetrates the guide hole.

[0061] In the embodiment, the guide column 16 is provided with at least one, and preferably a plurality. Specifically, two pairs of guide columns 16 are fixed on the top of the piston 4, and the guide columns 16 are fixed with the piston 4 by penetrating through the buffer tank positioning plate 11 and the fixed plate 22. The guide columns 16 provide a guiding effect when the piston 4 is raised and lowered, so as to ensure the stability of the movement of the piston 4.

[0062] In the optional technical scheme of the embodiment, the buffer tank 1 is transferred by the transfer trolley 17, and the transfer trolley 17 can enter and exit the rack 2; the jacking member is arranged on the rack 2 and is used to lift the buffer tank 1, so as to take the buffer tank 1 off the transfer trolley 17 and place it on the rack 2, or take the buffer tank 1 on the rack 2 off and place it on the transfer trolley 17.

[0063] In the embodiment, the buffer tank 1 is in the form of a double-layer tank body, and the transfer trolley 17 is used to transport the buffer tank 1 containing high-solid slurry, and mainly used to transport the buffer tank 1 to the material pressing mechanism. After the transfer trolley 17 reaches the designated position of the rack 2, the jacking member jacks up the buffer tank 1 containing slurry, the transfer trolley 17 is pulled out, and the jacking member returns to the original position, so as to take the buffer tank 1 off the transfer trolley 17 and place it on the rack 2. The process of taking the buffer tank 1 on the rack 2 off and placing it on the transfer trolley 17 is opposite to the above process, and will not be described here. The jacking member arranged on the rack 2 can facilitate the taking and placing of the buffer tank 1.

[0064] In the optional technical scheme of the embodiment, the positioning member 18 is arranged at the output end of the jacking member; the buffer tank 1 is provided with a support seat 19, and the support seat 19 is provided with a positioning hole 20, the positioning member 18 is correspondingly matched with the positioning hole 20, and is used to be inserted into the positioning hole 20.

[0065] In the embodiment, the output end of the jacking member is provided with the positioning member 18, and the support seat 19 of the buffer tank 1 is provided with the positioning hole 20, so that the positioning member 18 can be inserted into the positioning hole 20 when the jacking member is jacked, thereby ensuring the accuracy of the position of the buffer tank 1.

[0066] Preferably, the positioning member 18 is in the form of a tapered head, and the positioning hole 20 is a counterbore, and they have a deviation correction effect when matched with each other.

[0067] In the embodiment, the jacking member can be a pneumatic cylinder 21, an electric cylinder or a hydraulic cylinder, but is not limited thereto, and can also be other structures meeting the requirements.

[0068] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A pressing mechanism for pressing slurry in a buffer tank (1), wherein the buffer tank (1) has an opening at the top and a discharge port at the bottom, characterized in that, The pressing mechanism includes: a driver, a pressing component, and a frame (2); The driver is mounted on the frame (2), and the pressing component is connected to the driver; The pressing component can extend into the buffer tank (1) through the tank opening. The driver is used to drive the pressing component to move so as to squeeze the slurry in the buffer tank (1) toward the discharge port and discharge it from the discharge port. It also includes a lifting component, the buffer tank (1) is transported by a transfer vehicle (17), and the transfer vehicle (17) is able to enter and exit the rack (2). The lifting component is mounted on the frame (2) and is used to lift the buffer tank (1) so as to remove the buffer tank (1) from the transfer vehicle (17) and place it on the frame (2), or remove the buffer tank (1) from the frame (2) and place it on the transfer vehicle (17).

2. The pressing mechanism according to claim 1, characterized in that, The actuator includes an electric cylinder (3), and the pressing component includes a piston (4). The output end of the electric cylinder (3) is connected to the piston (4).

3. The pressing mechanism according to claim 2, characterized in that, It also includes a sealing ring (5); The piston (4) has an installation groove on its outer edge, and the sealing ring (5) is fitted into the installation groove.

4. The pressing mechanism according to claim 3, characterized in that, Along the axial direction of the piston (4), the piston (4) includes an upper piston body (6), a middle piston body (7) and a lower piston body (8). The middle plug (7) is provided with an upper protrusion (9) in the middle part, the upper plug (6) is sleeved on the upper protrusion (9) and connected to the upper side of the middle plug (7), and the lower plug (8) is connected to the lower side of the middle plug (7). Along the radial direction of the piston (4), the outer edge of the middle piston (7) is lower than the outer edge of the upper piston (6) and the outer edge of the lower piston (8) so that the mounting groove is formed between the upper piston (6), the middle piston (7) and the lower piston (8).

5. The pressing mechanism according to claim 4, characterized in that, The piston (4) also includes a pressure ring (10); The clamping ring (10) is disposed in the mounting groove. The clamping ring (10) is used to press the sealing ring (5) so that the sealing ring (5) protrudes outward along the radial direction of the piston (4).

6. The pressing mechanism according to claim 2, characterized in that, It also includes a buffer tank positioning plate (11), the output end of the electric cylinder (3) is inserted through the buffer tank positioning plate (11), and the piston (4) is located on the side of the buffer tank positioning plate (11) away from the electric cylinder (3); The buffer tank positioning plate (11) is provided with a positioning pin (12) on the side away from the electric cylinder (3), and a pin hole (13) is provided at the tank opening to cooperate with the positioning pin (12). The positioning pin (12) is used to be inserted into the pin hole (13).

7. The pressing mechanism according to claim 2, characterized in that, It also includes an exhaust pipe (14) along the axial direction of the piston (4), on which an exhaust port (15) is provided. The exhaust pipe (14) is connected to the exhaust port (15), and an exhaust valve is provided on the exhaust pipe (14).

8. The pressing mechanism according to claim 2, characterized in that, It also includes a guide post (16), and the frame (2) is provided with a guide hole. One end of the guide post (16) is connected to the side of the piston (4) facing the electric cylinder (3), and the other end of the guide post (16) passes through the guide hole.

9. The pressing mechanism according to claim 1, characterized in that, It also includes a positioning element (18), which is disposed at the output end of the lifting element; The buffer container (1) is provided with a support base (19), and the support base (19) is provided with a positioning hole (20). The positioning element (18) is correspondingly engaged with the positioning hole (20) and is used to be inserted into the positioning hole (20).

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