Slurry feeding device and coating machine

Abstract

The utility model relates to the technical field of slurry coating, and discloses a slurry feeding device and a coating machine, the slurry feeding device comprises a material tank, a delivery pump, a control valve and a first pressure sensor; a material storage cavity is formed in the material tank, an air inlet is formed in the material tank, the conveying pump is connected with the material tank and used for pumping slurry in the material storage cavity outwards, a discharging opening is formed in the conveying pump, and the first pressure sensor is arranged at the discharging opening and used for detecting the discharging pressure at the discharging opening; the control valve is located outside the material tank and connected with the air inlet, the control valve is in signal connection with the first pressure sensor, and the control valve is used for controlling the flow of external air entering the material storage cavity according to the discharging pressure value detected by the first pressure sensor; the slurry feeding device mainly solves the technical problem that in the prior art, due to the fact that the air pressure in the material tank is unstable, the slurry discharging pressure is unstable.

Description

Technical Field

[0001] The utility model relates to the technical field of slurry coating, in particular to a slurry feeding device and a coating machine. Background Art

[0002] The current process for preparing battery electrodes is to first apply a preset slurry on the surface of the foil, then place the electrode in an oven for baking and drying to solidify the slurry on the foil, and finally roll up the battery electrode and release it when needed. Specifically, the prior art uses a feeding device to apply the slurry to the surface of the foil by extruding it on an extrusion die. During this process, the function of the feeding device in the coater is to uniformly, continuously and stably deliver the positive electrode slurry or the negative electrode slurry to the extrusion die. Therefore, the consistency of the surface density of the electrode coating slurry is highly correlated with the stability of the discharge pressure of the feeding device. The material tank in the existing slurry feeding device is mostly an open structure (that is, the material tank is a normal pressure tank). The pressure at the outlet of the material tank will change with the change of the surrounding atmospheric pressure, thereby affecting the stability of the slurry coating pressure and further affecting the consistency of the surface density of the electrode coating slurry. In addition, the liquid level of the slurry in the material tank will continue to drop after being supplied to the outside, which will also cause the pressure at the outlet of the material tank to drop. Combined with the influence of the atmospheric pressure around the material tank on the outlet pressure of the material tank, the pressure at the outlet of the material tank will eventually fluctuate irregularly, thereby greatly affecting the stability of the slurry coating pressure and ultimately affecting the consistency of the surface density of the electrode coating slurry.

[0003] Therefore, there is a need to improve the existing technology. Utility Model Content

[0004] The utility model provides a slurry feeding device and a coating machine, which mainly solve the technical problem in the prior art that the slurry feeding device has unstable slurry discharge pressure due to unstable air pressure inside a material tank.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A slurry feeding device includes a material tank, a delivery pump, a control valve and a first pressure sensor;

[0007] A storage chamber for accommodating slurry is provided in the material tank, an air inlet is provided on the material tank, the delivery pump is connected to the material tank and is used to pump the slurry in the storage chamber outward, the delivery pump has a discharge port, the first pressure sensor is provided at the discharge port and is used to detect the discharge pressure at the discharge port; the control valve is located outside the material tank and connected to the air inlet, the control valve is connected to the first pressure sensor signal, and the control valve is used to control the flow of external gas into the storage chamber according to the discharge pressure value detected by the first pressure sensor.

[0008] In one of the technical solutions, the material tank is connected to the delivery pump through a hose, and the slurry feeding device also includes a driving mechanism, which is connected to the material tank or the delivery pump, and is connected to the first pressure sensor signal. The driving mechanism is used to change the relative height of the material tank and the delivery pump in the first direction according to the discharge pressure value detected by the first pressure sensor.

[0009] In one of the technical solutions, the material tank is further provided with a feed port, an exhaust port and a liquid level detector; the feed port is connected to a feed valve, and the exhaust port is connected to an exhaust valve;

[0010] The liquid level detector is used to detect the liquid level of the slurry in the storage chamber, and the feed valve and the exhaust valve are both connected to the liquid level detector signal;

[0011] When the exhaust valve is in an open state to reduce the air pressure in the material storage chamber, the driving mechanism is used to increase the relative height of the material tank and the delivery pump in the first direction.

[0012] In one of the technical solutions, a second pressure sensor is also provided on the material tank, which is used to detect the air pressure in the storage chamber. The second pressure sensor is connected to the feed valve signal. When the second pressure sensor detects that the air pressure in the storage chamber falls within a predetermined range, the feed valve switches from a closed state to an open state.

[0013] In one of the technical solutions, the slurry feeding device also includes a stirring mechanism, which includes a motor, a stirring paddle and a porous disk. The motor is connected to the outside of the material tank, the stirring paddle is connected to the output shaft of the motor and extends into the storage cavity, the porous disk is fixedly connected to the stirring paddle and is located in the storage cavity, and the porous disk is lower than the feed port. The porous disk is provided with a plurality of holes passing through the first direction, and the holes are used to allow the slurry entering from the feed port to flow downward.

[0014] In one technical solution, a central hole is provided on the central axis of the porous disk, and the stirring paddle passes through the central hole and is fixedly connected to the porous disk;

[0015] Along the direction from the outer edge of the porous disk to the central axis, the vertical distance between the porous disk and the bottom wall of the tank gradually decreases.

[0016] In one of the technical solutions, the liquid level detector is an ultrasonic detector connected to the top of the material tank, and the porous disk is provided with a detection hole penetrating in the first direction. When the porous disk rotates, the rotation path of the detection hole includes a position directly below the first direction of the liquid level detector.

[0017] In one technical solution, the material tank includes a tank body and an upper cover, the tank body is provided with an open material storage tank, the upper cover seals the material storage tank and is jointly enclosed with the tank wall of the material storage tank to form the material storage cavity;

[0018] The air inlet, the air outlet, the second pressure sensor and the liquid level detector are all arranged on the upper cover, and the feed port is arranged on the side of the tank body.

[0019] In one technical solution, the driving mechanism includes a connected driver and a lifting seat;

[0020] The material tank is fixed on the lifting seat, the driver is used to drive the lifting seat to move in a first direction, and both sides of the material tank are connected to guide components.

[0021] The present application also provides a coating machine, comprising an extrusion die and a slurry feeding device according to any one of the above technical solutions, wherein the extrusion die is connected to the discharge port, and the extrusion die is used to extrude the slurry onto a preset product.

[0022] Compared with the prior art, the slurry feeding device provided by the present invention has at least the following beneficial effects:

[0023] When feeding, the feeding device of this scheme pumps the slurry in the material tank outward by the delivery pump, so that the slurry is coated on the surface of a preset product (such as a battery electrode). This scheme sets a first pressure sensor at the discharge port of the delivery pump, which can more accurately reflect the discharge pressure value of the slurry. This scheme improves the existing open normal pressure material tank into a positive pressure material tank that requires internal air intake, and the control valve automatically controls the flow rate of external gas entering the storage chamber according to the discharge pressure value detected by the first pressure sensor, that is, the storage chamber is automatically inflated, and the air pressure in the storage chamber and the first pressure sensor are closed-loop controlled, so that the pressure value of the slurry discharged outward at the discharge port of the delivery pump can be maintained within a preset range, thereby improving the consistency of the surface density of the slurry coated on the battery electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic structural diagram of a slurry feeding device provided in an embodiment of the present application at a first angle;

[0026] Figure 2 A schematic structural diagram of a slurry feeding device provided in an embodiment of the present application at a second angle;

[0027] Figure 3 for Figure 1 The schematic diagram of the structure of the slurry feeding device shown is behind the hidden part of the tank body;

[0028] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0029] Reference numerals:

[0030] 10. Exhaust valve; 11. Material tank; 111. Storage chamber; 112. Air inlet; 113. Feed port; 114. Exhaust port; 115. Tank body; 116. Upper cover; 12. Delivery pump; 121. Discharge port; 13. Control valve; 14. First pressure sensor; 15. Driving mechanism; 151. Driver; 152. Lifting seat; 16. Hose; 17. Liquid level detector; 18. Second pressure sensor; 100. Stirring mechanism; 101. Motor; 102. Stirring paddle; 103. Porous disk; 1031. Hole position; 1032. Detection hole; 200. Trolley; 300. Guide assembly. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0032] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms, "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0036] Please also refer to Figures 1 to 4 The embodiment of the present utility model provides a slurry feeding device, which mainly includes a material tank 11, a delivery pump 12, a control valve 13 and a first pressure sensor 14, wherein a storage chamber 111 is provided in the material tank 11, and this storage chamber 111 is used to accommodate a preset slurry (such as a positive electrode slurry or a negative electrode slurry for coating on a battery electrode sheet), and an air inlet 112 is provided on the material tank 11, and this air inlet 112 is used to allow external gas to enter the storage chamber 111 of the material tank 11, so that the storage chamber 111 is in a positive pressure state, that is, the air pressure in the storage chamber 111 is greater than the air pressure of the outside air, wherein the gas entering the storage chamber 111 cannot chemically react with the slurry, preferably, the gas entering the storage chamber 111 is an inert gas, and the inert gas is further preferably not polluting the external space. Nitrogen; wherein, the delivery pump 12 is connected to the bottom of the material tank 11, and the delivery pump 12 has a discharge port 121. The delivery pump 12 is used to pump the slurry in the storage chamber 111 outward from the discharge port 121 so that the slurry can be coated on a preset product (such as a battery electrode). The delivery pump 12 is preferably a screw pump with stable delivery pressure. The above-mentioned first pressure sensor 14 is arranged at the discharge port 121 of the delivery pump 12. The first pressure sensor 14 is used to detect the discharge pressure at the discharge port 121, and the control valve 13 is located outside the material tank 11 and connected to the air inlet 112. The control valve 13 is also connected to the signal of the first pressure sensor 14. Specifically, it is understood that the control valve 13 is used to control the flow of nitrogen into the storage chamber 111 according to the discharge pressure value detected by the first pressure sensor 14.

[0037] Specifically, when the feeding device of this embodiment is feeding, the delivery pump 12 pumps the slurry in the material tank 11 outward so that the slurry is coated on the surface of a preset product (such as a battery electrode). This solution is provided with a first pressure sensor 14 at the discharge port 121 of the delivery pump 12, which can more accurately reflect the discharge pressure value of the slurry. This solution improves the existing open atmospheric pressure material tank 11 into a positive pressure material tank 11 that requires internal air intake, and the control valve 13 automatically controls the flow rate of nitrogen entering the storage chamber 111 according to the discharge pressure value detected by the first pressure sensor 14, that is, the storage chamber 111 is automatically inflated, and the air pressure in the storage chamber 111 and the first pressure sensor 14 form a closed-loop control, so that the pressure value of the slurry discharged outward at the discharge port 121 of the delivery pump 12 can be maintained within a preset range, thereby improving the consistency of the surface density of the slurry coated on the battery electrode.

[0038] It can be specifically understood that there are two main factors that affect the pressure value of the outward material at the discharge port 121 of the conveying pump 12. One factor is the air pressure in the storage chamber 111, and the other is the liquid level height of the slurry in the storage chamber 111 relative to the conveying pump 12. Specifically, when the change in the liquid level height of the slurry in the storage chamber 111 relative to the delivery pump 12 is ignored, the greater the air pressure in the storage chamber 111, the greater the pressure value of the outward discharge at the discharge port 121 of the delivery pump 12 will be, and the smaller the air pressure in the storage chamber 111, the smaller the pressure value of the outward discharge at the discharge port 121 of the delivery pump 12 will be; when the change in the air pressure in the storage chamber 111 is ignored, the higher the liquid level height of the slurry in the storage chamber 111 relative to the delivery pump 12, the greater the pressure value of the outward discharge at the discharge port 121 of the delivery pump 12 will be, and the lower the liquid level height of the slurry in the storage chamber 111 relative to the delivery pump 12, the smaller the pressure value of the outward discharge at the discharge port 121 of the delivery pump 12 will be. During the actual feeding process, since the slurry in the storage chamber 111 will gradually decrease, the liquid level height of the slurry in the storage chamber 111 relative to the delivery pump 12 will gradually decrease. At this time, it is necessary to continuously pump nitrogen into the storage chamber 111 to increase the air pressure in the storage chamber 111, so as to compensate the discharge pressure by inflation, so as to achieve the purpose of outputting the slurry from the discharge port 121 of the delivery pump 12 at a stable pressure value.

[0039] As can be seen from the above paragraph, the liquid level height of the slurry in the storage chamber 111 relative to the delivery pump 12 is also a factor that affects the discharge pressure of the delivery pump 12 at the discharge port 121. Therefore, in addition to the first technical means of stabilizing the discharge pressure of the slurry at the discharge port 121 of the delivery pump 12 by filling the storage chamber 111 with gas, a second technical means of using a driving mechanism 15 to change the relative height of the material tank 11 relative to the delivery pump 12 (i.e., changing the liquid level height of the slurry in the storage chamber 111 relative to the delivery pump 12) can be used to stabilize the discharge pressure of the slurry at the discharge port 121 of the delivery pump 12. It can be specifically understood that when the discharge pressure of the slurry at the discharge port 121 of the delivery pump 12 is low, the second technical means can be used to change the relative height of the material tank 11 relative to the delivery pump 12 (i.e., changing the liquid level height of the slurry in the storage chamber 111 relative to the delivery pump 12). The driving mechanism 15 drives the material tank 11 to increase its relative height relative to the delivery pump 12, so that the liquid level of the slurry in the storage chamber 111 is higher, thereby increasing the discharge pressure at the discharge port 121 of the slurry delivery pump 12 and reaching a preset pressure value; when the discharge pressure of the slurry at the discharge port 121 of the delivery pump 12 is too high, the driving mechanism 15 can be used to drive the material tank 11 to decrease its relative height relative to the delivery pump 12, so that the liquid level of the slurry in the storage chamber 111 is lower, thereby reducing the discharge pressure at the discharge port 121 of the slurry delivery pump 12 and reaching a preset pressure value, that is, the driving mechanism 15 and the first pressure sensor 14 are also signal-connected, and the driving mechanism 15 and the first pressure sensor 14 are also closed-loop controlled. The drive mechanism 15 can be connected to the material tank 11, and the drive mechanism 15 can also be connected to the delivery pump 12. When the drive mechanism 15 is connected to the material tank 11, the drive mechanism 15 drives the material tank 11 to rise, thereby increasing the relative height of the material tank 11 and the delivery pump 12; when the drive mechanism 15 is connected to the delivery pump 12, the drive mechanism 15 drives the delivery pump 12 to descend, thereby increasing the relative height of the material tank 11 and the delivery pump 12. In addition, based on the structural design that the relative height between the material tank 11 and the delivery pump 12 can be changed, the material tank 11 and the delivery pump 12 are connected by a hose 16, so that the material tank 11 and the delivery pump 12 can be reliably connected to each other and the relative height between the two can be changed under the drive of the drive mechanism 15.

[0040] In this embodiment, the drive mechanism 15 preferably includes a connected driver 151 and a lifting base 152, wherein the driver 151 is preferably a pneumatic cylinder. The aforementioned material tank 11 and the lifting base 152 are fixedly connected. The driver 151 is used to drive the lifting base 152 to move in a first direction (in this embodiment, the first direction is preferably the vertical direction; in other embodiments, the first direction may also form an angle with the vertical direction) to drive the material tank 11 to move in the vertical direction, thereby changing the relative height between the material tank 11 and the delivery pump 12. In addition, a guide assembly 300 is connected to both sides of the material tank 11. The guide assembly 300 may be a combination of a guide rail and a slider, or a combination of a guide rod and a linear bearing. By providing the guide assembly 300, the accuracy of the vertical movement of the material tank 11 can be improved.

[0041] In this embodiment, during the normal outward feeding process of the feeding device, it is preferred to rely only on controlling the flow rate of gas entering the storage chamber 111 to control the efficiency of increasing the air pressure in the storage chamber 111 to achieve the slurry being output outward at a stable pressure value at the discharge port 121 of the delivery pump 12. When the slurry in the storage chamber 111 is insufficient and needs to be replenished, the driving mechanism 15 is used to increase the relative height between the material tank 11 and the delivery pump 12 to maintain the slurry so that it can be continuously output outward at a stable pressure value at the discharge port 121 without stopping the machine.

[0042] Specifically, in order to realize the function of automatically replenishing the slurry in the material tank 11, the present embodiment provides a feed port 113, an exhaust port 114, a liquid level detector 17 and a second pressure sensor 18 on the material tank 11, wherein the feed port 113 is connected to an electrically controlled feed valve (not shown in the figure), and the exhaust port 114 is connected to an electrically controlled exhaust valve 10. The feed valve and the exhaust valve 10 are both connected to the liquid level detector 17 signal, and the second pressure sensor 18 is also connected to the feed valve signal. The liquid level detector 17 is used to detect the liquid level height of the slurry in the storage chamber 111. The liquid level detector 17 is preferably an ultrasonic detector. The second pressure sensor 18 is used to detect the air pressure in the storage chamber 111. When the liquid level detector 17 is When it is detected that there is insufficient slurry in the storage chamber 111, the exhaust port 114 automatically opens, and the gas in the storage chamber 111 will leak out. At this time, the external nitrogen can choose not to enter the storage chamber 111. When the second pressure sensor 18 detects that the air pressure in the storage chamber 111 is lower than a predetermined range (for example, the second pressure sensor 18 detects that the air pressure in the storage chamber 111 is approximately equal to the external atmospheric pressure), the feed valve is then switched from a closed state to an open state, and the external slurry will enter the storage chamber 111 from the feed port 113. When the liquid level detector 17 detects that the height of the slurry in the storage chamber 111 is sufficient, the exhaust valve 10 and the feed valve will automatically close, and the function of automatically replenishing liquid into the material tank 11 is completed.

[0043] As can be seen from the above paragraph, during the process of automatically replenishing liquid into the material tank 11, the air pressure in the storage chamber 111 will become smaller or even drop to normal pressure due to the opening of the exhaust port 114. Therefore, during the process of replenishing liquid, the driving mechanism 15 in this embodiment needs to drive the material tank 11 to rise to increase the relative height of the material tank 11 and the delivery pump 12 in the vertical direction, thereby compensating for the insufficient discharge pressure of the slurry at the discharge port 121 of the delivery pump 12, thereby facilitating the maintenance of the slurry to be continuously output at a stable pressure value at the discharge port 121 without stopping the machine. When the replenishment is completed, the air pressure in the storage chamber 111 will gradually rise due to the closing of the exhaust port 114 and the continuous injection of gas into the storage chamber 111. When the air pressure in the storage chamber 111 reaches a certain value, the driving mechanism 15 can drive the material tank 11 to gradually move downward and finally return the material tank 11 to its initial position.

[0044] In this embodiment, the material tank 11 includes a tank body 115 and an upper cover 116. The tank body 115 is provided with an open material storage trough. The upper cover 116 seals the material storage trough and together with the trough wall of the material storage trough forms the above-mentioned material storage cavity 111. The above-mentioned air inlet 112, exhaust port 114, second pressure sensor 18 and liquid level detector 17 are preferably all arranged on the upper cover 116, and the above-mentioned feed port 113 is arranged on the side of the tank body 115. This structural design makes it easier to layout various components, and the structure is more reasonable and compact.

[0045] In this embodiment, the slurry feeding device also includes a stirring mechanism 100, which specifically includes a motor 101, a stirring paddle 102 and a porous disk 103, wherein the motor 101 is fixed to the outside of the upper cover 116 of the material tank 11, and the stirring paddle 102 is connected to the output shaft of the motor 101 and extends into the storage chamber 111. When the stirring paddle 102 rotates under the drive of the motor 101, it can stir the slurry in the storage chamber 111 to improve the uniformity of the slurry, thereby improving the consistency of the surface density of the slurry finally coated on the product. Among them, a center hole is provided on the central axis of the porous disk 103, and the stirring paddle 102 passes through the center hole and is fixedly connected to the porous disk 103; the porous disk 103 rotates synchronously with the stirring paddle 102, and the porous disk 103 is located in the storage chamber 111 and lower than the feed port 113. A plurality of downward-penetrating holes 1031 are provided on the porous disk 103. These holes 1031 are used to allow the slurry entering from the feed port 113 to flow downward to the bottom. When the porous disk 103 rotates synchronously with the stirring paddle 102, the porous disk 103 cuts the slurry horizontally through the plurality of holes 1031 to achieve the effect of defoaming, that is, to reduce the gas mixed into the slurry. Preferably, along the direction from the outer edge of the porous disk 103 to the central axis, the vertical distance between the porous disk 103 and the bottom wall of the tank 11 gradually decreases, that is, the top surface of the porous disk 103 is a structure that gradually slopes downward from the outer circle to the center (slope structure). By designing the porous disk 103 as a slope structure, when the liquid level of the slurry is high, the slurry can be driven by the porous disk 103 to perform centrifugal motion, thereby further improving the defoaming ability of the porous disk 103; in addition, when the liquid level of the slurry is low and the external slurry is not During the process of replenishing the storage chamber 111, the slurry falling from the feed port 113 onto the porous disk 103 can collide with the top surface of the porous disk 103 and be stirred upward by the porous disk 103 and then fall down. This can reduce the gas content of the slurry when it comes in. It can be seen that in the process of slurry feeding, the porous disk 103 also plays a defoaming role. Moreover, during feeding, since the porous disk 103 has a certain blocking effect on the newly incoming slurry, it can effectively solve the problem of slurry splashing during the liquid feeding process. In addition, the porous disk 103 is provided with a detection hole 1032 that penetrates in the vertical direction. When the porous disk 103 rotates, the rotation path of the detection hole 1032 includes a position directly below the liquid level detector 17, so that the liquid level detector 17 fixed on the top of the material tank 11 can detect the liquid level in the storage cavity 111 through the detection hole 1032. A plurality of detection holes 1032 can be provided along the circumferential direction. At this time, the liquid level detector 17 can detect the liquid level in the storage cavity 111 through any one of the detection holes 1032, so that the liquid level detector 17 can obtain the liquid level information in the storage cavity 111 in a shorter time.

[0046] In this embodiment, the slurry feeding device further includes a trolley 200 , and the above-mentioned material tank 11 , driving mechanism 15 , delivery pump 12 and control valve 13 can all be fixed on the trolley 200 , so that the slurry feeding device can be easily moved to different positions for operation.

[0047] This embodiment also provides a coating machine, which includes an extrusion die and the above-mentioned slurry feeding device, the extrusion die is connected to the discharge port 121 of the delivery pump 12, and the extrusion die is used to extrude the slurry onto the preset product. The extrusion die can be designed with corresponding structures according to various preset products. This coating machine can also include an air source, which is connected to the above-mentioned control valve 13 to realize the function of pumping gas into the storage chamber 111. Since the coating machine of this embodiment adopts the above-mentioned slurry feeding device, it can also make the slurry be applied to the preset product at a stable pressure value, thereby also improving the consistency of the surface density of the preset product coating.

[0048] The above is merely a preferred embodiment of the present invention and only specifically describes the technical principles of the present invention. These descriptions are intended only to explain the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be imagined by those skilled in the art without inventive effort, shall be included within the scope of protection of the present invention.

Claims

1. A slurry feeding device, characterized in that: It includes a material tank (11), a delivery pump (12), a control valve (13) and a first pressure sensor (14); The material tank (11) is provided with a storage chamber (111) for accommodating slurry, and the material tank (11) is provided with an air inlet (112). The delivery pump (12) is connected to the material tank (11) and is used to pump the slurry in the storage chamber (111) outward. The delivery pump (12) has a discharge port (121). The first pressure sensor (14) is provided at the discharge port (121) and is used to detect the discharge pressure at the discharge port (121); the control valve (13) is used to be connected to the air inlet (112), the control valve (13) is connected to the first pressure sensor (14) signal, and the control valve (13) is used to control the flow of external gas into the storage chamber (111) according to the discharge pressure value detected by the first pressure sensor (14).

2. The slurry feeding device according to claim 1, characterized in that: The slurry feeding device further includes a driving mechanism (15), wherein the driving mechanism (15) is connected to the material tank (11) or the delivery pump (12), and the driving mechanism (15) is connected to the first pressure sensor (14) for signal communication, and the driving mechanism (15) is used to change the relative height of the material tank (11) and the delivery pump (12) in a first direction according to the discharge pressure value detected by the first pressure sensor (14).

3. The slurry feeding device according to claim 2, characterized in that: The material tank (11) is also provided with a feed port (113), an exhaust port (114) and a liquid level detector (17); the feed port (113) is connected to a feed valve, and the exhaust port (114) is connected to an exhaust valve (10); The liquid level detector (17) is used to detect the liquid level height of the slurry in the storage chamber (111), and the feed valve and the exhaust valve (10) are both connected to the liquid level detector (17) for signal transmission; When the exhaust valve (10) is in an open state so that the air pressure in the storage chamber (111) is lower than a preset range, the driving mechanism (15) is used to increase the relative height of the material tank (11) and the delivery pump (12) in a first direction.

4. The slurry feeding device according to claim 3, characterized in that: The material tank (11) is further provided with a second pressure sensor (18), which is used to detect the air pressure in the material storage chamber (111). The second pressure sensor (18) is connected to the feed valve signal. When the second pressure sensor (18) detects that the air pressure in the material storage chamber (111) falls within a predetermined range, the feed valve switches from a closed state to an open state.

5. The slurry feeding device according to claim 3, characterized in that: The slurry feeding device also includes a stirring mechanism (100), the stirring mechanism (100) includes a motor (101), a stirring paddle (102) and a porous disk (103), the motor (101) is connected to the outside of the material tank (11), the stirring paddle (102) is connected to the output shaft of the motor (101) and extends into the storage cavity (111), the porous disk (103) is fixedly connected to the stirring paddle (102) and is located in the storage cavity (111), and the porous disk (103) is lower than the feed port (113), and a plurality of holes (1031) penetrating along the first direction are provided on the porous disk (103), and the holes (1031) are used to allow the slurry entering from the feed port (113) to flow downward.

6. The slurry feeding device according to claim 5, characterized in that: A central hole is provided on the central axis of the porous disk (103), and the stirring paddle (102) passes through the central hole and is fixedly connected to the porous disk (103); Along the direction from the outer edge of the porous disk (103) to the central axis, the vertical distance between the porous disk (103) and the bottom wall of the tank (11) gradually decreases.

7. The slurry feeding device according to claim 5, characterized in that: The liquid level detector (17) is connected to the top of the material tank (11), and a detection hole (1032) is provided on the porous disk (103) and passes through in the first direction. When the porous disk (103) rotates, the rotation path of the detection hole (1032) includes a position directly below the liquid level detector (17) in the first direction.

8. The slurry feeding device according to claim 4, characterized in that: The material tank (11) comprises a tank body (115) and an upper cover (116); the tank body (115) is provided with an open material storage tank; the upper cover (116) seals the material storage tank and is formed together with the tank wall of the material storage tank to form the material storage cavity (111); The air inlet (112), the air outlet (114), the second pressure sensor (18) and the liquid level detector (17) are all arranged on the upper cover (116), and the feed port (113) is arranged on the side of the tank body (115).

9. The slurry feeding device according to any one of claims 2 to 7, characterized in that: The driving mechanism (15) includes a connected driver (151) and a lifting seat (152); The material tank (11) is fixed on the lifting seat (152), the driver (151) is used to drive the lifting seat (152) to move in a first direction, and both sides of the material tank (11) are connected to guide components (300).

10. A coating machine, characterized in that: It comprises an extrusion die and the slurry feeding device according to any one of claims 1 to 9, wherein the extrusion die is connected to the discharge port, and the extrusion die is used to extrude the slurry onto a preset product.

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