Part cleaning device

Abstract

The utility model belongs to the technical field of cleaning equipment, and particularly discloses a part cleaning device which comprises a cleaning frame provided with a plurality of groove bodies used for cleaning parts. The water rotating mechanism is arranged on at least one groove body, the groove body provided with the water rotating mechanism is provided with a liquid inlet part, the water rotating mechanism comprises a liquid inlet pipe arranged on the liquid inlet part, and the liquid inlet pipe is eccentrically arranged on the liquid inlet part; and the filtering and circulating assembly corresponds to the tank body and is used for filtering and circulating the cleaning liquid in the tank body. By means of the water rotating mechanism, when cleaning fluid on the corresponding cleaning station needs to rotate, the cleaning fluid in the cleaning tank does not need to be stirred through stirring blades, the function of rotating the cleaning fluid in the cleaning tank can be achieved by adjusting the water inlet angle of the cleaning fluid after circulation, and therefore the rotating structure is simplified, and the cleaning efficiency is improved. And the integrality and practicability of the equipment are improved, and the equipment is more convenient to mount, dismount and maintain daily.

Description

TECHNICAL FIELD

[0001] The utility model relates to cleaning equipment technical field, especially a kind of component cleaning device. BACKGROUND

[0002] The main role of cleaning line includes removing dirt on the surface of workpiece, improving product quality, prolonging equipment life, etc. It strips and cleans the dirt on the surface of workpiece through various cleaning processes. This non-contact cleaning method will not cause mechanical damage to the workpiece, and will not cause secondary pollution.

[0003] In the prior art, the cleaning line equipment generally uses multi-station cleaning process to clean the components, and integrates cleaning, transfer and other functions. The structure is complex. For the equipment that needs to stir the cleaning liquid in the cleaning station, a stirring mechanism is usually added to stir the cleaning liquid in the cleaning tank. The added stirring structure will make the internal structure of the cleaning tank too complex, which brings inconvenience to equipment installation and maintenance. UTILITY MODEL CONTENT

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a component cleaning device to solve the problem of complex stirring mechanism of the cleaning equipment in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a component cleaning device, which comprises:

[0006] A cleaning rack is provided with a plurality of grooves for cleaning parts;

[0007] A water rotating mechanism is arranged on at least one of the grooves. The groove provided with the water rotating mechanism is provided with a liquid inlet part. The water rotating mechanism comprises a liquid inlet pipe arranged on the liquid inlet part. The liquid inlet pipe is eccentrically arranged on the liquid inlet part.

[0008] A filter circulation assembly is arranged corresponding to the groove for filtering and circulating the cleaning liquid in the groove.

[0009] Optionally, the liquid inlet part is a circular barrel, the axis of the liquid inlet pipe is arranged in parallel with the radial direction of the liquid inlet part, and the axis of the liquid inlet pipe has a bias amount from the axis of the liquid inlet part.

[0010] Optionally, the groove comprises a first groove, a second groove, a third groove and a fourth groove. A fifth groove is arranged between the fourth groove and the discharging mechanism. The water rotating mechanism is arranged on the first groove and the fourth groove.

[0011] Optionally, the filtering circulating assembly is arranged corresponding to the first tank, the second tank and the fourth tank, and the filtering circulating assembly comprises a circulating box, an oil filter and a liquid pump, the circulating box is arranged in the rack, the oil filter is arranged on the circulating box, an input end of the oil filter is communicated with an inside of the circulating box, an input end of the liquid pump is communicated with the inside of the circulating box, and an output end of the liquid pump is communicated with the inside of the tank.

[0012] Optionally, the water rotating mechanism further comprises a water inlet pipe arranged at the output end of the liquid pump, and the water inlet pipe is connected with the liquid inlet pipe.

[0013] Optionally, the liquid pump comprises a centrifugal pump and a filter, the centrifugal pump is communicated with the inside of the circulating box, the filter is connected with the centrifugal pump, and an output end of the filter is connected with the water inlet pipe.

[0014] Optionally, the first tank, the second tank and the fourth tank are provided with a first overflow port, and the second tank and the third tank are provided with a second overflow port, and the height of the second overflow port is higher than that of the first overflow port.

[0015] Optionally, the circulating box is provided with a drainage part corresponding to the first overflow port, and the cleaning liquid in the first tank, the second tank or the fourth tank flows to the drainage part through the first overflow port.

[0016] Optionally, a plurality of heaters for heating the cleaning liquid are arranged in the circulating box.

[0017] Optionally, the device further comprises a liquid discharging mechanism, the liquid discharging mechanism comprises a liquid discharging pipe and a liquid discharging pump, the liquid discharging pipe is communicated with the inside of the circulating box, and a free end of the liquid discharging pipe is connected with the liquid discharging pump.

[0018] As described above, the part cleaning device has the following beneficial effects:

[0019] The water rotating mechanism is arranged, and when the cleaning liquid on the corresponding cleaning station needs to be rotated, the cleaning liquid in the cleaning tank is not stirred by the stirring blade, but the rotation function of the cleaning liquid in the cleaning tank can be realized by adjusting the water inlet angle of the cleaning liquid after circulation, so that the rotation structure is simplified, the overall equipment is improved, and the equipment is more convenient to install, disassemble and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A structure schematic diagram of an embodiment of the present application is shown;

[0021] Figure 2 An internal structure schematic diagram of an embodiment of the present application is shown;

[0022] Figure 3 Figure 7 shows a rear view of the cleaning assembly according to an embodiment of the present application;

[0023] Figure 4 Figure 8 shows a bottom structure diagram of the cleaning assembly according to an embodiment of the present application;

[0024] Figure 5 Figure 9 shows an enlarged view of A according to an embodiment of the present application;

[0025] Figure 6 Figure 10 shows a diagram of the water spinning mechanism according to an embodiment of the present application;

[0026] Figure 7 Figure 11 shows a diagram of another embodiment of the first tank according to the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] Rack 1, feeding conveying frame 2, feeding sensor 201, discharging conveying frame 3, discharging sensor 301, truss robot 4, cleaning frame 5, first tank 6, second tank 7, third tank 8, second overflow port 801, fourth tank 9, fifth tank 10, liquid inlet part 11, liquid inlet pipe 12, water inlet pipe 13, first overflow port 14, drainage part 15, circulation tank 16, oil filter 17, centrifugal pump 18, filter 19, heating rod 20, bubble nozzle 21, drying mechanism 22, material frame 23, liquid discharge pipe 24, liquid discharge pump 25. DETAILED DESCRIPTION

[0029] The embodiments of the present application will be described in detail with specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied in other different embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0030] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components related to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex. The structures, proportions, sizes, etc., shown in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0031] like Figures 1-7 As shown, this utility model proposes a parts cleaning device.

[0032] In one exemplary embodiment, the cleaning line equipment includes:

[0033] Frame 1, which is equipped with a feeding mechanism and a discharging mechanism;

[0034] A transfer mechanism, mounted on frame 1, is used to transfer parts;

[0035] A cleaning assembly is installed inside the frame 1. The cleaning assembly includes a cleaning rack 5, which has multiple cleaning positions. At least one cleaning position is equipped with a swirl mechanism, which is used to drive the cleaning liquid in the cleaning position to rotate.

[0036] The filter circulation component is set up corresponding to the cleaning position and is used for filtering and circulating the cleaning solution within the cleaning position.

[0037] In this embodiment, the swirling mechanism eliminates the need for stirring the cleaning fluid inside the cleaning tank by adjusting the inlet angle of the circulating cleaning fluid. This simplifies the rotating structure, improves the overall integrity of the equipment, and makes installation, disassembly, and maintenance more convenient.

[0038] This embodiment, through the set transfer mechanism, loading mechanism and unloading mechanism, can realize fully automatic cleaning of equipment, realize intelligent and automated cleaning, and reduce the labor intensity of workers.

[0039] It is worth noting that in this embodiment, the cleaning of parts is mainly carried out by loading the corresponding parts into the corresponding material frame 23 of the cleaning line. Under the support of the material frame 23, the transfer mechanism carries the material frame 23 to each cleaning station for automated cleaning.

[0040] In this embodiment, the frame 1 is equipped with multiple door panels, all of which can be opened to facilitate the corresponding maintenance operations by the operators.

[0041] In an exemplary embodiment, the cleaning position corresponding to the swirling mechanism is provided with a liquid inlet 11. The swirling mechanism includes a water inlet pipe 13 and a liquid inlet pipe 12 disposed on the liquid inlet 11. The water inlet pipe 13 is disposed at the output end of the filter circulation assembly, and the liquid inlet pipe 12 is eccentrically disposed on the liquid inlet 11. One end of the liquid inlet pipe 12 is connected to the interior of the liquid inlet 11, and the other end of the liquid inlet pipe 12 is connected to the free end of the water inlet pipe 13.

[0042] For example, such as Figure 6 As shown, the liquid inlet 11 is a circular barrel shape, and the axis of the liquid inlet pipe 12 is arranged parallel to the radial direction of the liquid inlet 11. The axis of the liquid inlet pipe 12 is offset by a distance L from the axis of the liquid inlet 11.

[0043] In this embodiment, the swirling water function can be achieved by providing a liquid inlet 11 at the bottom of the tank. When the filtration and circulation assembly guides the circulated cleaning fluid to the liquid inlet pipe 12 through the water inlet pipe 13, the cleaning fluid enters the liquid inlet 11 from the water inlet pipe 13 under the drive of the power. Figure 4 As shown, since the liquid inlet 11 is a circular barrel-shaped part located at the bottom of the tank, and due to the offset relationship between the liquid inlet pipe 12 and the liquid inlet 11, the axis of the liquid inlet pipe 12 is offset from the axis of the liquid inlet 11. After the cleaning liquid enters the liquid inlet 11, it will collide with the inner wall of the tank. Due to inertia, it will move and rotate along the inner wall of the tank. The movement angle of the cleaning liquid changes from linear motion to circular motion along the inner wall of the liquid inlet 11. In the early stage, the cleaning liquid will form a local circulation on the inner wall. As the liquid inlet 11 continuously inputs the cleaning liquid, the rotational force can be continuously superimposed, thereby enabling the cleaning liquid in the tank to achieve overall circulation. This realizes the function of overall rotation of the cleaning liquid inside the tank, eliminating the need for stirring blades and simplifying the internal structure of the tank.

[0044] It is worth noting that in this embodiment, the rotation of the cleaning fluid is achieved by adjusting the water inlet angle of the cleaning fluid. The offset between the axis of the inlet pipe 12 and the axis of the inlet part 11 affects the rotation intensity of the cleaning fluid. The smaller the offset, the smaller the rotation intensity of the cleaning fluid; the larger the offset, the larger the rotation intensity of the cleaning fluid. Therefore, the offset can be adjusted to adjust the rotation force of the cleaning fluid.

[0045] It is worth mentioning that in the embodiment, the bottom of the circular barrel can also be changed into a conical barrel, and by adjusting the angle of the cone, the operation of metal scraps and heavier impurities can be automatically gathered at the bottom of the tank. The bottom of the tank can be provided with a corresponding impurity collector, thereby realizing the self-cleaning function of the equipment. By adjusting the angle of the cone, the rotation intensity of the cleaning liquid is affected, and the smaller the angle of the cone, the greater the rotation intensity.

[0046] It is worth mentioning that the first tank body 6 and the fourth tank body 9 are also provided with a bubbling assembly, and the bubbling assembly comprises a plurality of high-pressure bubbling nozzles 21 arranged therein. The high-pressure gas flow drives the cleaning liquid to wash the surface of the parts, thereby improving the cleaning effect.

[0047] In an exemplary embodiment, the cleaning position comprises a first tank body 6, a second tank body 7, a third tank body 8 and a fourth tank body 9 arranged in sequence and continuously from the feeding mechanism to the discharging mechanism. The fourth tank body 9 is provided with a fifth tank body 10 between the fourth tank body 9 and the discharging mechanism, and the water rotating mechanism is arranged on the first tank body 6 and the fourth tank body 9.

[0048] In the embodiment, the first tank body 6 is a rough cleaning position, the second tank body 7 is a fine cleaning position, the third tank body 8 and the fourth tank body 9 are rinsing positions, the cleaning liquid in the first tank body 6 contains a cleaning agent for cleaning the parts, and the cleaning liquid containing the cleaning agent is only circulated and filtered in the first tank body 6. Since the cleaning liquid in the first tank body 6 is constantly rotating, the oil stains washed off the parts will be located outside the water body and at the uppermost layer of the water body due to the centrifugal force, so the oil stains can enter the filter assembly through the first overflow port 14, and the oil stains are collected and removed. The treated cleaning liquid is recirculated to the first tank body 6 for cleaning the parts. The water rotating mechanism arranged on the fourth tank body 9 is used to drive the cleaning agent and impurity oil stains remaining on the surface of the parts, such as various cleaning liquid bubbles, to be located at the outer edge of the upper layer when rotating. The principle is similar to that of the first tank body 6, and the impurities overflow through the first overflow port 14 for filtration.

[0049] Exemplarily, the rack 1 is provided with a drying mechanism 22 corresponding to the inside of the fifth tank body 10. The drying mechanism 22 is used to dry the parts cleaned by the plurality of stations for subsequent processing. In the embodiment, the drying mechanism 22 adopts a hot air blower, and the blowing angle of the hot air blower is adjusted to be aligned with the inside of the fifth tank body 10 and corresponding to the fixed position of the parts in the fifth tank body 10, thereby realizing the drying of the parts. An independent liquid recovery pipe is arranged in the fifth tank body 10 to facilitate the collection of the cleaning liquid in the fifth tank body 10.

[0050] It is worth mentioning that in the embodiment, the second overflow port 801 is arranged between the second tank body 7 and the third tank body 8, so that the impurities such as oil stains floating in the third tank body 8 can overflow into the second tank body 7, and then enter the circulating tank 16 through the first overflow port 14 in the second tank body 7. Therefore, the second tank body 7 and the third tank body 8 can be provided with a filtering and circulating assembly. When the cleaning liquid is introduced, the cleaning liquid can be introduced into the second tank body 7 through the second overflow port 801. In the embodiment, the second tank body 7 and the third tank body 8 are ultrasonic cleaning, and structures capable of realizing ultrasonic cleaning are correspondingly arranged. In addition, a bubbling assembly is arranged at the bottom, and the bubbling assembly includes a plurality of high-pressure bubbling nozzles 21. The cleaning liquid is driven by high-pressure airflow to wash the surface of the parts, thereby improving the cleaning effect.

[0051] It is also worth mentioning that in the embodiment, as shown in Figure 7 The inner wall of the first tank body 6 can be conical to facilitate the solid impurities carried by the parts during processing to enter the bottom of the first tank body 6, thereby facilitating automatic collection of the equipment and cleaning by the workers.

[0052] It is also worth mentioning that in the embodiment, the first overflow port 14 is arranged on the side wall of each tank body, and the first overflow port 14 is a through groove. The second overflow port 801 is arranged on the partition plate between the second tank body 7 and the third tank body 8, and the height of the first overflow port 14 is lower than that of the second overflow port 801. Therefore, the oil stains in the third overflow port can completely enter the second tank body 7 and flow out from the corresponding first overflow port 14 of the second tank body 7 for filtering.

[0053] In an exemplary embodiment, as shown in Figure 3 and Figure 4 The filtering and circulating assembly includes a circulating tank 16, an oil filter 17 and a liquid pump. The circulating tank 16 is arranged in the rack 1, the oil filter 17 is arranged on the circulating tank 16, the input end of the oil filter 17 is in communication with the inside of the circulating tank 16, one end of the liquid pump is in communication with the inside of the circulating tank 16, and the other end is connected with the water inlet pipe 13. The circulating tank 16 is provided with a drainage part 15 corresponding to the first overflow port 14. The cleaning liquid in the first tank body 6, the second tank body 7 or the fourth tank body 9 flows to the drainage part 15 through the first overflow port 14.

[0054] In the embodiment, the oil filter 17 is arranged to collect and filter the oil stains generated during cleaning of the parts, so that the oil stains do not enter the tank body again through the circulating system during recycling of the cleaning liquid, thereby avoiding secondary pollution of the parts.

[0055] Exemplarily, the drain part 15 in the embodiment is a frame structure corresponding to the first overflow port 14, and can guide the cleaning liquid flowing from the first overflow port 14 into the circulating tank 16, and a sealing ring can be arranged at the contact position of the drain part 15 and the tank body to prevent the cleaning liquid from leaking.

[0056] Exemplarily, in the embodiment, the liquid extractor is a centrifugal pump 18 and a filter 19, the centrifugal pump 18 is in communication with the inside of the circulating tank 16, the filter 19 is connected with the centrifugal pump 18, and the output end of the filter 19 is connected with the water inlet pipe 13, so that the cleaning liquid can be filtered and then guided into the corresponding tank body, and the circulating cleaning liquid can meet the requirement of recycling.

[0057] It is worth mentioning that the oil filter 17 is a prior art, which will not be described here.

[0058] It is also worth mentioning that a plurality of heating rods 20 are arranged in each circulating tank 16 to meet the temperature requirement of the cleaning liquid during cleaning, and a corresponding temperature sensor is arranged in each tank body, and the heating rod 20 in the corresponding circulating tank 16 is connected through a controller to adjust the temperature of the cleaning liquid according to the preset temperature, thereby ensuring the cleaning effect. The temperature control in each tank adopts a PID control algorithm, the system collects the temperature of multiple points in the tank and the circulating tank 16 through a sensor, and forms a closed loop control circuit with the heating rod 20 in the system, the system continuously adjusts the operating power of the heating rod 20, so that the water temperature in the tank is in a stable state during operation, and the energy saving and environmental protection effect is achieved.

[0059] In an exemplary embodiment, the feeding mechanism includes a feeding conveying frame 2 and a feeding sensor 201, and the end of the feeding conveying frame 2 in the conveying direction is provided with a feeding position, and the feeding sensor 201 is arranged on the feeding conveying frame 2 and corresponds to the feeding position.

[0060] The feeding conveying frame 2 in the embodiment has a conveying function, can convey the material frame 23 placed thereon to the feeding position at the end thereof, and the feeding sensor 201 is located at the feeding position and can sense the arrival of the material frame 23, so that the transfer mechanism moves to the position corresponding to the feeding position to grasp the material frame 23 into the first tank body 6 for cleaning.

[0061] Similarly, the discharging mechanism includes a discharging conveying frame 3 and a discharging sensor 301, and the starting end of the discharging conveying frame 3 in the conveying direction is provided with a discharging position, and the discharging sensor 301 is arranged on the discharging conveying frame 3 and corresponds to the discharging position.

[0062] The feeding conveying frame 3 can also convey the material frame 23 placed thereon, send the material frame 23 out of the frame 1, temporarily buffer on the conveying frame, and the conveying frame is also provided with a sensor, when the sensor senses the material frame 23 at the front end of the conveying frame, the system will remind the operator in time to take the material through the buzzer and three-color light, and a plurality of material frames 23 can be buffered on the conveying frame. The operator can take them away at one time, the feeding position is located in the frame 1, the number of the feeding sensors 301 at the feeding position is two, when the material frame 23 on the feeding sensor 301 is full, the feeding sensor 301 has the material frame 23, the whole machine cannot feed again, feeds back to the controller to stop and alarms, and reminds the operator to complete the unloading operation of the front conveying frame as soon as possible.

[0063] In an example embodiment, the transfer mechanism includes a gantry robot 4 arranged on the frame 1, which can be used to move the parts in the direction from the feeding mechanism to the discharging mechanism.

[0064] The material frame 23 can be driven to each station for corresponding process treatment through the arranged gantry robot 4.

[0065] In an example embodiment, each circulating tank 16 in the embodiment is provided with a drainage pipe 24, and a drainage pump 25 is arranged in the frame 1, when drainage is needed, the drainage pump 25 is started, the drainage pipe 24 is opened, and the cleaning liquid in the plurality of circulating tanks 16 is extracted at the same time, so that the drainage efficiency is improved.

[0066] In an example embodiment, the application can also be provided with an evaporation circulator above the frame 1, and the evaporation circulator is provided with a suction pump, because the cleaning liquid in the tank body is heated and evaporated, the cleaning liquid is collected through the action of the suction pump, and the internal environment of the frame 1 can be prevented from being damp.

[0067] In summary, through the arrangement of the water rotating mechanism, when the cleaning liquid needs to be rotated on the corresponding cleaning station, the cleaning liquid in the cleaning tank can be rotated by adjusting the water inlet angle of the cleaning liquid after circulation, so that the rotating structure is simplified, the overall equipment is improved, and the installation, disassembly and maintenance of the equipment are more convenient.

[0068] The above examples only exemplarily illustrate the principles and effects of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above examples without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the application should be covered by the claims of the application.

Claims

1. A parts cleaning apparatus characterized by comprising: The utility model relates to a cleaning rack, which comprises: a plurality of grooves for cleaning parts; a water rotating mechanism arranged on at least one groove, wherein the groove provided with the water rotating mechanism is provided with a liquid inlet part, the water rotating mechanism comprises a liquid inlet pipe arranged on the liquid inlet part, and the liquid inlet pipe is arranged eccentrically on the liquid inlet part; a filter circulation assembly corresponding to the grooves for filtering and circulating the cleaning liquid in the grooves.

2. The zero-part cleaning device of claim 1, wherein: The liquid inlet part is a circular barrel, the axis of the liquid inlet pipe is arranged in parallel with the radial direction of the liquid inlet part, and the axis of the liquid inlet pipe is offset from the axis of the liquid inlet part.

3. The zero-part cleaning device of claim 2, wherein: The grooves comprise a first groove, a second groove, a third groove and a fourth groove, and the water rotating mechanism is arranged on the first groove and the fourth groove.

4. The zero-part cleaning device of claim 3, wherein: The filter circulation assembly is arranged corresponding to the first groove, the second groove and the fourth groove, and comprises a circulation tank, an oil filter and a liquid pump, the input end of the oil filter is communicated with the inside of the circulation tank, the input end of the liquid pump is communicated with the inside of the circulation tank, and the output end of the liquid pump is communicated with the inside of the groove.

5. The zero-part cleaning device of claim 4, wherein: The water rotating mechanism further comprises a water inlet pipe arranged on the output end of the liquid pump, and the water inlet pipe is connected with the liquid inlet pipe.

6. The zero-part cleaning apparatus of claim 5, wherein: The liquid pump comprises a centrifugal pump and a filter, the centrifugal pump is communicated with the inside of the circulation tank, the filter is connected with the centrifugal pump, and the output end of the filter is connected with the water inlet pipe.

7. The zero-part cleaning apparatus of claim 4, wherein: The first groove, the second groove and the fourth groove are provided with a first overflow port, and the second groove and the third groove are provided with a second overflow port, wherein the height of the second overflow port is higher than that of the first overflow port.

8. The zero-part cleaning device of claim 7, wherein: The circulation tank is provided with a drainage part corresponding to the first overflow port, and the cleaning liquid in the first groove, the second groove or the fourth groove flows to the drainage part through the first overflow port.

9. The zero-part cleaning device of claim 4, wherein: A plurality of heaters for heating the cleaning liquid are arranged in the circulation tank.

10. The zero-part cleaning apparatus of claim 4, wherein: The utility model further comprises a liquid discharge mechanism, which comprises a liquid discharge pipe and a liquid discharge pump, the liquid discharge pipe is communicated with the inside of the circulation tank, and the free end of the liquid discharge pipe is connected with the liquid discharge pump.

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