Resorption device

Abstract

The utility model relates to the technical field of normal-pressure filling, and discloses a back-suction device, which comprises a filling pump, a pump shaft, a material box, a pump body, a pump cover and a pump cover, one end of the discharging pipe is communicated with a discharging opening of the filling pump, and the other end of the discharging pipe is communicated with the container; and the controller is fixedly connected with the filling pump, the controller is suitable for controlling rotation of the pump shaft, and after single-time discharging is completed, the controller controls the pump shaft to rotate reversely, and residual materials in the discharging pipe are sucked back so that the residual materials can be away from an outlet of the discharging pipe. According to the back-suction device provided by the utility model, the controller is arranged on the filling pump, so that the pump shaft is controlled to rotate reversely through the controller after single-time discharging is completed, materials near the outlet of the discharging pipe are sucked back to the deep part of the discharging pipe, and the materials are prevented from leaking due to the action of gravity near the outlet of the discharging pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of atmospheric filling, and particularly relates to a back suction device. Background Art

[0002] To avoid material waste, a back suction device is usually used to recover residual materials, for example, in a beverage machine. With the accelerating pace of modern life, consumers' pursuit of the convenience of tea drink making is increasing day by day. The emergence of a fully automatic tea shaker is the result of the rapid growth of the tea drink market and consumers' demand for efficient tea drink making. The fully automatic tea shaker provides a convenient, efficient and reliable tea drink making experience for tea shops by improving the tea drink making efficiency, ensuring quality consistency and introducing intelligent technologies. However, during the use of the fully automatic tea shaker, after a single discharge, there is still residual material in the discharge pipe. Under the action of gravity, these residual materials flow out through the outlet of the discharge pipe, resulting in material dripping at the discharge port. These dripping materials will cause environmental pollution of the working environment and material waste. Summary of the Utility Model

[0003] In view of this, the utility model provides a back suction device to solve the problem of material dripping at the discharge port.

[0004] The utility model provides a back suction device, comprising:

[0005] A filling pump having a pump shaft, and the inlet is communicated with a material box;

[0006] A discharge pipe, one end of which is communicated with the discharge port of the filling pump, and the other end is communicated with a container;

[0007] A controller fixedly connected to the filling pump, and the controller is adapted to control the rotation of the pump shaft. After a single discharge is completed, the controller controls the pump shaft to rotate in reverse to back suction the residual material in the discharge pipe to keep it away from the outlet of the discharge pipe.

[0008] Beneficial effects: By arranging a controller on the filling pump, it is convenient to control the pump shaft to rotate in reverse through the controller after a single discharge, so as to back suction the material near the outlet of the discharge pipe to the deep part of the discharge pipe, thereby preventing the material from dripping due to the action of gravity near the outlet of the discharge pipe.

[0009] In an optional embodiment, the discharge pipe at least includes a first pipeline and a connecting pipeline which are sequentially communicated. The first pipeline extends along the gravity direction, and the outlet of the first pipeline is communicated with the container. The inlet of the connecting pipeline is communicated with the discharge port.

[0010] In an alternative embodiment, the connecting pipeline is a flexible pipeline, or the connecting pipeline includes a second pipeline and a third pipeline which are connected in sequence and communicated with each other. The second pipeline extends horizontally and is located above the outlet of the first pipeline along the direction of gravity; the extending direction of the third pipeline is set at an angle with the extending direction of the second pipeline, and is communicated with the discharge port, and the included angle between the material return flow direction in the third pipeline and the direction of gravity is A, where 0° ≤ A < 90°.

[0011] Beneficial effects: By making the material return flow direction in the third pipeline parallel to the direction of gravity or the included angle is an acute angle, when the material in the second pipeline is sucked back into the third pipeline, it can be avoided that the material in the third pipeline flows out of the discharge pipe through the second pipeline and the first pipeline under the action of gravity.

[0012] In an alternative embodiment, there is a distance H between the outlet of the first pipeline and the liquid level inside the container, where H > 0 mm.

[0013] Beneficial effects: By having a distance between the outlet of the first pipeline and the liquid level of the material in the container, when a single discharge is completed and the material in the discharge pipe is sucked back by the filling pump, it can be avoided that the material in the container is simultaneously sucked into the discharge pipe under the action of the suction.

[0014] In an alternative embodiment, the filling pump is an electric pump, and the electric pump is adapted to transport the material in the material tank to the container.

[0015] In an alternative embodiment, the controller includes a single-chip microcomputer and a motor drive module which are electrically connected. The motor drive module is electrically connected to the drive motor of the electric pump, the output shaft of the drive motor is coaxially and fixedly connected to the pump shaft, and the single-chip microcomputer is adapted to control the drive motor to rotate through the motor drive module.

[0016] In an alternative embodiment, the controller further includes a Hall induction module which is electrically connected to the single-chip microcomputer. A magnetic part is fixedly connected to the outer peripheral wall of the pump shaft, and the Hall induction module cooperates with the magnetic part by Hall effect to detect the number of rotation turns of the pump shaft.

[0017] Beneficial effects: By arranging a magnetic part on the pump shaft, arranging a Hall induction module on the controller, and electrically connecting the Hall induction module to the single-chip microcomputer, it is convenient for the single-chip microcomputer to detect the number of rotation turns of the pump shaft.

[0018] In an alternative embodiment, the controller further includes a power supply module, and the power supply module is adapted to supply power to the drive motor.

[0019] In an alternative embodiment, a feed pipe is arranged between the feed inlet and the material tank. One end of the feed pipe is communicated with the feed inlet, and the other end is communicated with the material tank.

[0020] In an alternative embodiment, one end of the feed pipe close to the material box is communicated with the bottom of the material box along the gravity direction.

[0021] Beneficial effects: By communicating the feed pipe with the bottom of the material box, it is convenient to make full use of the container space of the material box, avoid residual materials at the bottom of the material box, causing material waste, and under the pressure of the upper materials, it is beneficial to press the lower materials into the feed pipe. Description of the Drawings

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic diagram of the back suction device of the present invention Figure 1 ;

[0024] Figure 2 Schematic diagram of the back suction device of the present invention Figure 2 ;

[0025] Figure 3 Three-dimensional schematic diagram of the filling pump of the present invention;

[0026] Figure 4 Exploded schematic diagram of the filling pump of the present invention;

[0027] Figure 5 Assembly schematic diagram of the pump body and the circuit board of the present invention;

[0028] Figure 6 Cross-sectional schematic diagram of the filling pump of the present invention.

[0029] Explanation of the reference numerals in the drawings:

[0030] 1. Filling pump; 11. Feed port; 12. Discharge port; 13. Pump body; 131. Driving motor; 14. End cover; 15. Pump shaft; 2. Material box; 3. Container; 4. Feed pipe; 5. Discharge pipe; 51. First pipeline; 52. Second pipeline; 53. Third pipeline; 54. Fourth pipeline; 6. Controller; 61. Circuit board; 62. Motor drive module; 63. Hall induction module; 64. Power supply module; 65. Single-chip microcomputer; 7. Electrode; 8. Magnetic part. Detailed Embodiments

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0035] Among the numerous functions of a fully automatic tea shaker, the function of preventing material dripping has an important role. In order to achieve the anti-dripping function, in the related art, the method of optimizing the valve design is adopted to improve the valve of the tea shaker. Wear-resistant materials are used and the structure of the valve is optimized to improve the sealing performance and durability of the valve, so as to ensure that the valve can be completely sealed when closed, thereby preventing material dripping. However, this method will increase the complexity of the equipment and the difficulty of maintenance, making operation and maintenance more difficult. Moreover, the increased complexity of the design of the discharge port will lead to cleaning problems, making it easy to hide dirt and be inconvenient to clean. At the same time, additional maintenance and adjustment are required, increasing the workload and technical requirements of users; or, the method of sensor control is adopted, introducing high-precision liquid level sensors or weight sensors, and the valve is controlled to close in real time by monitoring the weight or liquid level of the liquid flowing out, so as to more precisely control the liquid flow and reduce the possibility of dripping. However, this method may lead to an increase in the product price, increasing the cost of the tea shaker, and may require regular maintenance and professional replacement. In addition, the requirements for the sensor material are also very high. Once a failure occurs, repairing and replacing parts may take a long time and resources, which is not very convenient for users and not very cost-effective economically; or, the method of software adjustment is adopted. The control software can be adjusted according to the type and temperature of the material to optimize the flow control and ensure that no dripping occurs after the discharge is completed. However, this method needs to cooperate closely with the hardware, has low flexibility, and requires a lot of energy to maintain the software function. After changing the material, the control of dripping may fail due to the material characteristics. Therefore, a anti-dripping device with stable anti-dripping function, wide material application range and simple maintenance is needed.

[0036] The following combines Figures 1 to 6 , and describes the embodiments of the present invention.

[0037] According to the embodiments of the present invention, a suction device is provided. Taking a tea beverage machine as an example, it includes:

[0038] A filling pump 1, having a pump shaft 15, and the feed port 11 is communicated with the material box 2;

[0039] A discharge pipe 5, one end of which is communicated with the discharge port 12 of the filling pump 1, and the other end is communicated with the container 3;

[0040] A controller 6, fixedly connected to the filling pump 1, and the controller 6 is adapted to control the rotation of the pump shaft 15. After a single discharge is completed, the controller 6 controls the pump shaft 15 to reverse, and sucks back the residual material in the discharge pipe 5 to keep it away from the outlet of the discharge pipe 5.

[0041] The back-suction device provided in this embodiment is configured with a controller 6 on the filling pump 1, so as to control the reverse rotation of the pump shaft 15 by the controller 6 after a single discharge is completed, thereby sucking the material near the outlet of the discharge pipe 5 back to the deep part of the discharge pipe 5, and further preventing the material from dripping due to gravity near the outlet of the discharge pipe 5.

[0042] Specifically, the filling pump 1 has a pump body 13 and an end cover 14 that are detachably connected. A cavity is formed between the end cover 14 and the pump body 13. A partial area of the pump shaft 15 is disposed inside the pump body 13, and one end of the pump shaft 15 close to the end cover 14 is exposed outside the pump body 13 and located in the cavity. The controller 6 is located in the cavity and fixedly connected to the pump body 13 to facilitate controlling the rotation of the pump shaft 15. Among them, the end cover 14 is adapted to cover the pump shaft 15 and the controller 6 to protect the exposed parts of the controller 6 and the pump shaft 15.

[0043] The feed port 11 of the filling pump 1 is communicated with the material box 2, and the discharge port 12 of the filling pump 1 is communicated with the container 3 through the discharge pipe 5. After the controller 6 detects that a single discharge is completed, it controls the reverse rotation of the pump shaft 15, thereby sucking the residual material in the discharge pipe 5 away from the outlet of the discharge pipe 5, so as to prevent the material near the outlet of the discharge pipe 5 from flowing out of the discharge pipe 5 under the action of gravity, and further realizing the anti-drip function. The overall structure is simple, which is beneficial to improving the reliability and practicality of the tea machine. While preventing the material from dripping, it can also enhance the user experience, enabling the user to operate conveniently, avoiding the inconvenience and mess caused by the material dripping, and avoiding potential safety hazards, thereby enhancing the market competitiveness of the product; secondly, preventing the material from dripping keeps the working environment clean and tidy, improves work efficiency, and reduces the burden of cleaning work; in addition, preventing the material from dripping can also recover the residual material to the maximum extent, reduce waste, and save costs; and preventing the material from dripping also helps to maintain the brand image, ensure the consistency and quality of the product, and increase consumers' trust and loyalty to the brand.

[0044] In some embodiments, as shown in combination with Figure 1 and Figure 2 , the discharge pipe 5 at least includes a first pipeline 51 and a connecting pipeline that are sequentially connected and communicated. The first pipeline 51 extends along the gravity direction, and the outlet of the first pipeline 51 is communicated with the container 3. The inlet of the connecting pipeline is communicated with the discharge port 12.

[0045] Specifically, the outlet of the first pipeline 51 is located at the lower end of the first pipeline 51 along the gravity direction and faces the container 3. The discharge port 12 of the filling pump 1 is communicated with the inlet of the first pipeline 51 through the connecting pipeline, so as to be adapted to convey the material in the material box 2 to the container 3 through the connecting pipeline and the first pipeline 51. The connecting pipeline is bent in the area close to the first pipeline 51, so that a partial area of the connecting pipeline is located below the outlet of the first pipeline 51. The connecting pipeline can be, for example,Figure 1 The flexible pipeline shown can also be a rigid pipeline as Figure 2 shown.

[0046] In some embodiments, as shown in combination with Figure 2 the connecting pipeline includes a second pipeline 52 and a third pipeline 53 that are sequentially and communicatively arranged. The second pipeline 52 extends in the horizontal direction and is located above the outlet of the first pipeline 51 along the direction of gravity. The extending direction of the third pipeline 53 is set at an angle with the extending direction of the second pipeline 52, and is connected to the discharge port 12. The included angle between the material reflux direction in the third pipeline 53 and the direction of gravity is A, where 0° ≤ A < 90°.

[0047] For the back - suction device provided in this embodiment, by making the material reflux direction in the third pipeline 53 parallel to the direction of gravity or having an acute - angle with it, when the material in the second pipeline 52 is back - sucked into the third pipeline 53, it can be avoided that the material in the third pipeline 53 flows out of the discharge pipe 5 through the second pipeline 52 and the first pipeline 51 under the action of gravity.

[0048] As a feasible implementation form, the second pipeline 52 is arranged in the horizontal direction, the outlet of the second pipeline 52 is connected to the inlet of the first pipeline 51, the outlet of the third pipeline 53 is connected to the inlet of the second pipeline 52. The connecting pipeline further includes a fourth pipeline 54. The inlet of the fourth pipeline 54 is connected to the discharge port 12 of the filling pump 1, the outlet of the fourth pipeline 54 is connected to the inlet of the third pipeline 53. The fourth pipeline 54 is also arranged in the horizontal direction and its horizontal position is lower than the outlet of the first pipeline 51. By making the material reflux direction in the third pipeline 53 parallel to the direction of gravity or having an acute - angle with it, when the material in the second pipeline 52 flows to the third pipeline 53 or the material - incoming side of the third pipeline 53 under the back - suction action, it can be avoided that the material drips into the container 3 through the second pipeline 52 and the first pipeline 51 under the action of gravity.

[0049] In some embodiments, as shown in combination with Figures 1 to 2 the outlet of the first pipeline 51 has a spacing H from the liquid level inside the container 3, where H > 0 mm.

[0050] For the back - suction device provided in this embodiment, by having a spacing between the outlet of the first pipeline 51 and the material liquid level in the container 3, when a single discharge is completed and the filling pump 1 back - sucks the material in the discharge pipe 5, it can be avoided that the material in the container 3 is simultaneously sucked into the discharge pipe 5 under the back - suction action.

[0051] Specifically, a distance is reserved between the outlet end face of the first pipeline 51 and the preset liquid level in the container 3, so that when the filling pump 1 rotates in reverse to suck back the material after a single discharging, the first pipeline 51 is prevented from contacting the material in the container 3, thereby preventing the material in the container 3 from being sucked back into the discharging pipe 5.

[0052] In some embodiments, as shown in Figures 1 to 5 the filling pump is an electric pump, and the electric pump is adapted to convey the material in the material box 2 into the container 3.

[0053] In some embodiments, as shown in Figures 1 to 6 the controller 6 includes a single-chip microcomputer 65 and a motor driving module 62 which are electrically connected. The motor driving module 62 is electrically connected to the driving motor 131 of the electric pump. The output shaft of the driving motor 131 is coaxially and fixedly connected to the pump shaft 15. The single-chip microcomputer 65 is adapted to control the driving motor 131 to rotate through the motor driving module 62.

[0054] Specifically, the controller 6 further includes a circuit board 61. Preferably, the plane where the circuit board 61 is located is perpendicular to the axial direction of the pump shaft 15. A driving motor 131 is arranged inside the pump body 13, and an electrode 7 connected to the driving motor 131 is arranged on the pump body 13. At least part of the structure of the electrode 7 is located in the cavity formed by the pump body 13 and the end cover 14. A pad is arranged on the circuit board 61 corresponding to the position of the electrode 7, so as to realize the connection between the circuit board 61, the electrode 7 and the pump body 13 by welding through the electrode 7 and the pad, avoiding the problems of easy dropping and instability existing in the way of using spring terminals for wiring in the related art. The circuit board 61 and the pump body 13 are connected together by welding, with stable connection and less wiring, which is convenient for designing the shell and can prevent the circuit board 61 from getting water under the covering of the end cover 14. The control pins of the single-chip microcomputer 65 are electrically connected to the control pins of the motor driving chip of the motor driving module 62. The motor driving module 62 is connected to the driving motor 131 through the circuit board 61 and the electrode 7, so that the control program in the single-chip microcomputer 65 is adapted to control the rotation of the driving motor 131 through the motor driving module 62, and further control the rotation of the pump shaft 15 through the driving motor 131, so as to realize the control of the rotation or stop, forward rotation or reverse rotation of the pump shaft and the adjustment of the rotation speed. And different reverse rotation speeds and times can be set according to the characteristics of different materials to improve the reliability of anti-dripping and expand the application range of the anti-dripping device.

[0055] In some embodiments, as shown in Figures 1 to 6 the controller 6 further includes a Hall induction module 63 electrically connected to the single-chip microcomputer 65. A magnetic part 8 is fixedly connected to the outer peripheral wall of the pump shaft 15. The Hall induction module 63 cooperates with the magnetic part 8 through the Hall effect to detect the number of rotation turns of the pump shaft 15.

[0056] The back suction device provided in this embodiment is configured by setting a magnetic member 8 on the pump shaft 15, a Hall induction module 63 on the controller 6, and electrically connecting the Hall induction module 63 to the single-chip microcomputer 65, so as to facilitate the single-chip microcomputer 65 to detect the number of rotations of the pump shaft 15.

[0057] Specifically, the Hall induction module 63 is fixedly connected to the circuit board 61 to be adapted to form an electrical connection with the single-chip microcomputer 65 through the circuit board 61. The Hall induction module 63 and the magnetic member 8 are correspondingly arranged. The magnetic member 8 can be an annular magnetic bead. The annular magnetic bead is arranged around the axis direction of the pump shaft 15 and fixedly connected to the outer peripheral wall of the pump shaft 15. The annular magnetic bead has 2N equally spaced electrodes in one circle, where N is a positive integer. Thus, when the annular magnetic bead rotates one circle with the pump shaft 15, N pulse signals are formed on the Hall induction module 63. The magnetic member 8 can also be a magnet, and the number of magnets is 2M, where M is a positive integer. And a plurality of magnets are equally spaced along the circumferential direction of the pump shaft 15. When the plurality of magnets rotate one circle with the pump shaft 15, M pulse signals are formed on the Hall induction module 63. The single-chip microcomputer 65 is adapted to count the pulse signals detected by the Hall induction module 63, so as to detect the number of rotations and speed of the pump shaft 15, and further control the rotation or stop of the pump shaft 15, as well as control the forward or reverse rotation of the pump shaft 15 through the motor drive module 62.

[0058] In some embodiments, as shown in Figures 1 to 6 the controller 6 further includes a power supply module 64, and the power supply module 64 is adapted to provide power for the driving motor 131.

[0059] Specifically, the power supply module 64 is adapted to be connected to an external power supply to facilitate providing power for modules such as the single-chip microcomputer 65, the motor drive module 62, the Hall induction module 63 on the controller 6, and the driving motor 131.

[0060] In some embodiments, as shown in Figures 1 to 6 a feed pipe 4 is provided between the feed inlet 11 and the material box 2. One end of the feed pipe 4 is communicated with the feed inlet 11, and the other end is communicated with the material box 2.

[0061] Specifically, the filling pump 1 pumps the material in the material box 2 into the discharge pipe 5 through the feed pipe 4 and transports it to the container 3 through the discharge pipe 5.

[0062] In some embodiments, as shown in Figure 1 and Figure 2 one end of the feed pipe 4 close to the material box 2 is communicated with the bottom of the material box 2 along the gravity direction.

[0063] The back suction device provided in this embodiment is connected to the bottom of the material box 2 through the feed pipe 4, so as to make full use of the container space of the material box 2, avoid residual materials at the bottom of the material box 2, causing material waste, and under the pressure of the upper materials, it is beneficial to press the lower materials into the feed pipe 4.

[0064] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the present invention.

Claims

1. A suction device, characterized in that, Comprising: A filling pump (1) having a pump shaft (15), with a feed inlet (11) communicating with a material tank (2); A discharge pipe (5), one end of which communicates with the discharge outlet (12) of the filling pump (1), and the other end communicates with a container (3); A controller (6) fixedly connected to the filling pump (1), the controller (6) being adapted to control the rotation of the pump shaft (15). After a single discharge is completed, the controller (6) controls the pump shaft (15) to rotate in reverse to suck back the residual material in the discharge pipe (5) to keep it away from the outlet of the discharge pipe (5).

2. The back suction device according to claim 1, characterized in that, The discharge pipe (5) at least includes a first pipe (51) and a connecting pipe that are sequentially connected and communicated. The first pipe (51) extends along the direction of gravity, and the outlet of the first pipe (51) communicates with the container (3). The inlet of the connecting pipe communicates with the discharge outlet (12).

3. The back suction device according to claim 2, characterized in that, The connecting pipe is a flexible pipe, or the connecting pipe includes a second pipe (52) and a third pipe (53) that are sequentially connected and communicated. The second pipe (52) extends horizontally and is located above the outlet of the first pipe (51) along the direction of gravity. The extending direction of the third pipe (53) is set at an angle with the extending direction of the second pipe (52) and communicates with the discharge outlet (12). The included angle between the material reflux direction in the third pipe (53) and the direction of gravity is A, where 0° ≤ A < 90°.

4. The back suction device according to claim 3, wherein, There is a distance H between the outlet of the first pipe (51) and the liquid level inside the container (3), where H > 0 mm.

5. The back suction device according to claim 1, wherein The filling pump is an electric pump, and the electric pump is adapted to transport the material in the material tank (2) to the container (3).

6. The back suction device according to claim 5, characterized in that, The controller (6) includes a single-chip microcomputer (65) and a motor drive module (62) that are electrically connected. The motor drive module (62) is electrically connected to the drive motor (131) of the electric pump. The output shaft of the drive motor (131) is coaxially and fixedly connected to the pump shaft (15). The single-chip microcomputer (65) is adapted to control the rotation of the drive motor (131) through the motor drive module (62).

7. The suck-back device according to claim 6, characterized in that, The controller (6) further includes a Hall induction module (63) electrically connected to the single-chip microcomputer (65). A magnetic member (8) is fixedly connected to the outer peripheral wall of the pump shaft (15). The Hall induction module (63) cooperates with the magnetic member (8) through the Hall effect to detect the number of rotations of the pump shaft (15).

8. The back suction device according to claim 6, characterized in that, The controller (6) further includes a power supply module (64), and the power supply module (64) is adapted to supply power to the drive motor.

9. The back suction device according to any one of claims 1 to 8, characterized in that, A feed pipe (4) is provided between the feed inlet (11) and the material tank (2). One end of the feed pipe (4) communicates with the feed inlet (11), and the other end communicates with the material tank (2).

10. The back suction device according to claim 9, characterized in that, One end of the feed pipe (4) close to the material tank (2) communicates with the bottom of the material tank (2) along the direction of gravity.

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