Filtering device for separating greasy dirt

Abstract

The utility model relates to the technical field of separation equipment, in particular to a filtering device for separating oil stains. Comprising an oil-water tank, oil-water mixed cutting fluid is accumulated in the oil-water tank, a submersible pump is fixedly installed on one side of the oil-water tank, a pre-separation mechanism is installed on one side of the submersible pump, and after the submersible pump pumps the cutting fluid in the oil-water tank into the pre-separation mechanism, the pre-separation mechanism conducts primary oil-water separation on the cutting fluid in the pre-separation mechanism; and a filtering mechanism is mounted on one side of the pre-separation mechanism. After the cutting fluid is injected into the second box body, the oil-water mixed cutting fluid is crushed and separated layer by layer by the plurality of filter screens, so that the oil floats to the water, the water below the oil is discharged into the clean water tank through the drain pipe, and the oil floating on the water is discharged out of the second box body through the waste oil discharge pipe, so that the oil-water separation of the cutting fluid is realized; the cutting fluid in the clean water tank is not covered by an oil film, so that the cutting fluid is not easy to stink, and the cooling effect on the cutter is better during recycling.

Description

Technical Field

[0001] The utility model relates to the technical field of separation equipment, and more specifically, to a filtering device for separating oil and grease. Background Art

[0002] The steering shaft equipped on an automobile is an essential component for ensuring the safety of passengers during driving. Therefore, the processing requirements for components related to safety are very high. When the automobile is turning, after a person rotates the steering wheel, the steering gear distributes to the steering shaft to turn left or right, causing the gear shaft to drive the wheel tie rod to turn left or right accordingly. To ensure the dimensional tolerances of the steering shaft without deviation or burrs, it is necessary to ensure the stability of the tool life during the processing.

[0003] Currently, when using machine tool equipment for cutting and processing the steering shaft, the water cooling processing method is usually adopted. When the weather is hot or after a long-term shutdown, it is very easy for the cutting fluid to become smelly, resulting in inaccurate cutting of the product dimensions. At the same time, when the smelly cutting fluid cools the tool, the cooling effect will be reduced, thus shortening the life of the tool for cutting metal. In view of this, we propose a filtering device for separating oil and grease. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide a filtering device for separating oil and grease to solve the problems raised in the above background art.

[0005] To achieve the above purpose, one of the purposes of the present utility model is to provide a filtering device for separating oil and grease, including an oil-water tank in which a cutting fluid mixed with oil and water is stored. A submersible pump is fixedly installed on one side of the oil-water tank. A pre-separation mechanism is installed on one side of the submersible pump. After the submersible pump pumps the cutting fluid in the oil-water tank into the pre-separation mechanism, the pre-separation mechanism conducts primary oil-water separation on the cutting fluid inside it. A filtering mechanism is installed on one side of the pre-separation mechanism. The cutting fluid after primary oil removal by the pre-separation mechanism flows into the filtering mechanism, and the filtering mechanism conducts secondary oil-water separation on the cutting fluid inside it. A clean water tank is fixedly connected to one side of the filtering mechanism, and the clean water tank is used to receive the water separated from the cutting fluid.

[0006] As a further improvement of this technical solution, the filtering mechanism includes a second box body. A filter screen is fixedly connected to the inner wall of the second box body. A plurality of the filter screens are arranged in a linear array. A partition is provided between the filter screen closest to the clean water tank and the second box body. Both sides of the partition are fixedly connected to the inner wall of the second box body. A water passing trough is provided between the lower end of the partition and the bottom surface inside the second box body.

[0007] As a further improvement of the technical solution, an oil discharge pipe is provided on the side of the partition away from the clean water tank. One end of the oil discharge pipe penetrates through one side of the second box body. A drain pipe is provided between the partition and the clean water tank. The drain pipe connects the inside of the second box body and the clean water tank. An inlet is provided on the side of the second box body away from the clean water tank. A plurality of the filter meshes are all located at the position between the inlet and the drain pipe.

[0008] As a further improvement of the technical solution, the pre-separation mechanism includes a first box body. The suction pipe of the submersible pump is communicated with the inside of the oil water tank, and the discharge pipe of the submersible pump is communicated with the inside of the first box body. A horizontal pipe is fixedly connected to a position near the bottom on one side of the first box body. A flow regulating valve is installed inside the horizontal pipe. One end of the horizontal pipe is communicated with the inlet of the second box body. The cutting fluid in the first box body flows into the inside of the second box body through the horizontal pipe under the action of gravity.

[0009] A deoiling component is provided in the first box body. The deoiling component preliminarily separates the oil floating on the cutting fluid in the first box body. An antifoaming component is provided on the side of the deoiling component close to the submersible pump. The antifoaming component is used to eliminate the bubbles in the cutting fluid in the first box body.

[0010] As a further improvement of the technical solution, the deoiling component includes a slideway fixedly connected in the first box body. One end of the slideway penetrates through one side of the first box body. A guide plate is fixedly connected to the upper surface of the slideway. A dial plate is rotatably connected to the inner wall of the first box body. A driving motor is installed on the outer wall of the first box body. The output shaft of the driving motor is coaxially and fixedly connected to the rotating shaft of the dial plate. The driving motor is used to drive the dial plate to rotate. When the dial plate rotates, the oil floating on the cutting fluid is transported to the guide plate, so that the oil flows into the inside of the slideway under the action of inertia.

[0011] As a further improvement of the technical solution, an oil collecting tank is fixedly connected to one side of the first box body. One end of the slideway outside the first box body is located directly above the oil collecting tank. A return pipe is fixedly connected to the bottom of the oil collecting tank. One end of the return pipe penetrates through the side of the second box body where the inlet is provided. A shut-off valve is installed on the inner wall of the return pipe.

[0012] As a further improvement of the technical solution, the antifoaming component includes a cover plate slidably arranged outside the first box body. The top surface inside the cover plate is fixedly connected with antifoaming spikes. A plurality of the antifoaming spikes are arranged in a rectangular array. Spring telescopic rods are symmetrically and fixedly connected to the lower surface of the cover plate. The lower ends of the spring telescopic rods are fixedly connected to the outer wall of the first box body. One end of the rotating shaft of the dial plate away from the driving motor penetrates through the first box body and is fixedly connected with a half gear. One side of the half gear is meshed with a rack. The rack is fixedly connected with one side of the cover plate.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] 1. After injecting the cutting fluid into the second box body, several filter nets break and separate the oil-water mixed cutting fluid layer by layer, causing the oil to float on the water. The water located below the oil is discharged into the interior of the clean water tank through the drain pipe, and the oil floating on the water is discharged from the second box body through the waste oil discharge pipe, realizing the oil-water separation of the cutting fluid. Since the cutting fluid in the clean water tank is not covered by an oil film, it is not prone to becoming smelly, and has a better cooling effect on the cutting tool during recycling.

[0015] 2. After pumping the cutting fluid into the interior of the first box body, the defoaming spikes that move vertically back and forth pierce and eliminate the bubbles in the cutting fluid, causing the oil in the cutting fluid in the first box body to float on the water and be swept into the interior of the slideway by the baffle plate, realizing the primary oil-water separation of the cutting fluid. Furthermore, the oil content of the cutting fluid entering the second box body is reduced, reducing the possibility of solid matter generated by the solidification of the oil liquid clogging the mesh holes of the filter net and ensuring the normal use of the filter net. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structural schematic diagram of the present utility model;

[0017] Figure 2 is the sectional view of the present utility model;

[0018] Figure 3 is the structural schematic diagram of the pre-separation mechanism of the present utility model;

[0019] Figure 4 is of the present utility model Figure 3 sectional view.

[0020] The meanings of each label in the figure are as follows:

[0021] 1. Oil-water tank; 2. Submersible pump;

[0022] 3. Pre-separation mechanism; 31. First box body; 32. Flow regulating valve; 33. Oil removal component; 331. Slideway; 332. Guide plate; 333. Baffle plate; 334. Oil collection tank; 335. Shut-off valve; 34. Defoaming component; 341. Cover plate; 342. Defoaming spikes; 343. Spring telescopic rod; 345. Rack; 346. Half gear;

[0023] 4. Filtering mechanism; 41. Second box body; 42. Filter net; 43. Partition board; 44. Waste oil discharge pipe;

[0024] 5. Clean water tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1

[0027] Please refer to Figure 1 As shown, this embodiment provides a filtering device for separating oil and grease, including an oil-water tank 1. The oil-water tank 1 stores cutting fluid mixed with oil and water. A submersible pump 2 is fixedly installed on one side of the oil-water tank 1. A pre-separation mechanism 3 is installed on one side of the submersible pump 2. After the submersible pump 2 pumps the cutting fluid in the oil-water tank 1 into the pre-separation mechanism 3, the pre-separation mechanism 3 performs primary oil-water separation on the cutting fluid inside it. A filtering mechanism 4 is installed on one side of the pre-separation mechanism 3. The cutting fluid after primary oil removal by the pre-separation mechanism 3 flows into the filtering mechanism 4. The filtering mechanism 4 performs secondary oil-water separation on the cutting fluid inside it. By setting the pre-separation mechanism 3, the oil content of the cutting fluid entering the filtering mechanism 4 is reduced, avoiding the clogging of the filtering mechanism 4 by cutting fluid with a large oil content and ensuring the normal use of the filtering mechanism 4. A clean water tank 5 is fixedly connected to one side of the filtering mechanism 4. The clean water tank 5 is used to receive the water separated from the cutting fluid.

[0028] In order to separate oil from the cutting fluid, make the cutting fluid not easily stink, and ensure the cooling effect of the cutting fluid, the structure of the pre-separation mechanism 3 is refined as follows. Refer to Figures 2 - 4, the pre-separation mechanism 3 includes a first box body 31. The water suction pipe of the submersible pump 2 is internally communicated with the oil water tank 1, and the water outlet pipe of the submersible pump 2 is internally communicated with the first box body 31. A horizontal pipe is fixedly connected to a position near the bottom on one side of the first box body 31. A flow regulating valve 32 is installed inside the horizontal pipe. The filtering mechanism 4 includes a second box body 41. One end of the horizontal pipe is communicated with the water inlet of the second box body 41. The cutting fluid in the first box body 31 flows into the second box body 41 through the horizontal pipe under the action of gravity. An oil removal component 33 is arranged in the first box body 31. The oil removal component 33 preliminarily separates the oil floating on the cutting fluid in the first box body 31. A defoaming component 34 is arranged on the side of the oil removal component 33 close to the submersible pump 2. The defoaming component 34 is used to eliminate the bubbles in the cutting fluid in the first box body 31. After the submersible pump 2 pumps the cutting fluid with a relatively high oil content from the oil water tank 1 into the first box body 31, the flow regulating valve 32 is closed, so that the cutting fluid accumulates inside the first box body 31 until the liquid level of the cutting fluid in the first box body 31 contacts the oil removal component 33, and then the flow regulating valve 32 is opened, so that the cutting fluid in the first box body 31 is discharged into the second box body 41 through the horizontal pipe. The flow rate of the discharged cutting fluid is adjusted through the flow regulating valve 32, and the discharge amount of the cutting fluid in the first box body 31 is equal to the inflow amount, and the liquid level height of the cutting fluid in the first box body 31 is constant. The defoaming component 34 performs defoaming treatment on the oil floating on the water, and the oil removal component 33 separates the oil floating on the water, so that the water located below the oil flows into the second box body 41 through the horizontal pipe, realizing the primary separation of oil and water in the cutting fluid, and avoiding the high oil content of the cutting fluid entering the second box body 41 and affecting the filtering effect of the filtering mechanism 4 on the oil in the cutting fluid.

[0029] In order to remove the oil floating on the cutting fluid in the first box body 31 and separate the oil from the water below it, the structure of the oil removal component 33 is refined as follows. Refer to Figure 3 and Figure 4, the oil removal component 33 includes a slideway 331 fixedly connected inside the first box body 31. One end of the slideway 331 penetrates through one side of the first box body 31. A guide plate 332 is fixedly connected to the upper surface of the slideway 331. A baffle plate 333 is rotatably connected to the inner wall of the first box body 31. A driving motor is installed on the outer wall of the first box body 31. The output shaft of the driving motor is coaxially and fixedly connected to the rotating shaft of the baffle plate 333. The driving motor is used to drive the baffle plate 333 to rotate. After controlling the liquid level height of the cutting fluid in the first box body 31 to be constant at the position in contact with the baffle plate 333, the driving motor is used to drive the baffle plate 333 to rotate. The baffle plate 333 transports the oil floating on the cutting fluid to the guide plate 332, and makes the oil flow into the inside of the slideway 331 under the action of inertia. During the process that the baffle plate 333 transports the floating oil below it to the guide plate 332, the water surface will be stirred, so that the remaining floating oil on the liquid surface of the cutting fluid floats below the baffle plate 333 and is then transported by the baffle plate 333. Furthermore, during the continuous rotation of the baffle plate 333, the oil floating on the water is comprehensively swept into the inside of the slideway 331, thereby separating the oil from the water.

[0030] During the process that the baffle plate 333 sweeps the oil floating on the water into the inside of the slideway 331, the oil and part of the water will be swept into the inside of the slideway 331 together. In order to recycle this part of the water, a collecting oil tank 334 is fixedly connected to one side of the first box body 31. The end of the slideway 331 outside the first box body 31 is directly above the collecting oil tank 334. A return pipe is fixedly connected to the bottom of the collecting oil tank 334. One end of the return pipe penetrates through the side of the second box body 41 where the water inlet is opened. A shut-off valve 335 is installed on the inner wall of the return pipe. The bottom surface of the inside of the slideway 331 is an inclined surface. The oil-water mixture entering the inside of the slideway 331 slides down along the inclined surface into the inside of the collecting oil tank 334 and stands still and layers inside the collecting oil tank 334. The oil in the collecting oil tank 334 floats on the water. When the oil-water mixture in the collecting oil tank 334 is about to be full, the shut-off valve 335 is opened, so that the water placed below the oil slowly flows into the inside of the second box body 41 through the return pipe and participates in the secondary oil-water separation, realizing the recycling of the water in the collecting oil tank 334. By the shut-off valve 335, the amount of water discharged from the collecting oil tank 334 is kept the same as the amount of the oil-water mixture entering the collecting oil tank 334, so that the liquid level height of the oil-water mixture in the collecting oil tank 334 remains unchanged.

[0031] Due to the difference between the oil phase and the water phase in the cutting fluid in the first box body 31, there are inevitably bubbles in the oil-water mixed cutting fluid, and the existence of these bubbles will block the oil from floating to the water surface, affecting the effect of oil-water separation. In order to eliminate the bubbles in the cutting fluid, the structure of the defoaming component 34 is refined as follows. Refer to Figure 3 and Figure 4, the defoaming assembly 34 includes a cover plate 341 slidably arranged outside the first box body 31. A defoaming spike 342 is fixedly connected to the top surface inside the cover plate 341. A plurality of defoaming spikes 342 are arranged in a rectangular array. Symmetrically fixed to the lower surface of the cover plate 341 are spring telescopic rods 343, and the lower ends of the spring telescopic rods 343 are fixedly connected to the outer wall of the first box body 31. The end of the rotating shaft of the dial plate 333 away from the driving motor penetrates through the first box body 31 and is fixedly connected to a semi-gear 346. One side of the semi-gear 346 is meshed with a rack 345, and the rack 345 is fixedly connected to one side of the cover plate 341. During the rotation of the dial plate 333, the rotating shaft of the dial plate 333 drives the semi-gear 346 to rotate. Through the meshing transmission between the semi-gear 346 and the rack 345, the rack 345 drives the cover plate 341 to move vertically downward, and the spring telescopic rods 343 elastically contract. When the semi-gear 346 disengages from the rack 345, the spring telescopic rods 343 rebound to lift the cover plate 341 upward, so that the cover plate 341 and the rack 345 are reset. After the semi-gear 346 rotates a certain angle, it can be meshed with the reset rack 345 again. Then, through the continuous rotation of the semi-gear 346, the cover plate 341 moves vertically back and forth. When the cover plate 341 drives a plurality of defoaming spikes 342 to move vertically back and forth synchronously, the defoaming spikes 342 repeatedly insert into the cutting fluid in the first box body 31 to puncture and eliminate the bubbles in the cutting fluid, so that the oil in the cutting fluid can float to the water surface smoothly, improving the effect of oil-water separation.

[0032] Refer to Figure 2, a filter screen 42 is fixedly connected to the inner wall of the second box body 41. A number of filter screens 42 are arranged in a linear array. A partition 43 is arranged between the filter screen 42 closest to the clean water tank 5 and the second box body 41. Both sides of the partition 43 are fixedly connected to the inner wall of the second box body 41. A water trough is arranged between the lower end of the partition 43 and the bottom surface inside the second box body 41. An oil discharge pipe 44 is arranged on the side of the partition 43 away from the clean water tank 5. One end of the oil discharge pipe 44 penetrates through one side of the second box body 41. The waste oil on the upper surface inside the second box body 41 is discharged through the waste oil discharge pipe 44. A drain pipe is arranged between the partition 43 and the clean water tank 5. The drain pipe connects the inside of the second box body 41 and the clean water tank 5. An inlet is opened on the side of the second box body 41 away from the clean water tank 5. A number of filter screens 42 are all located at the position between the inlet and the drain pipe. When the cutting fluid flows into the inside of the second box body 41 through the inlet, the cutting fluid accumulates in the second box body 41. The liquid on the side of the partition 43 close to the waste oil discharge pipe 44 flows into the other side of the partition 43 through the water trough. When the liquid level of the cutting fluid in the second box body 41 is higher than the connection between the drain pipe and the second box body 41, the cutting fluid in the second box body 41 flows into the inside of the clean water tank 5 through the drain pipe. During the flow of the cutting fluid in the second box body 41, a number of filter screens 42 break and separate the oil-water mixed cutting fluid layer by layer. Then, due to the density relationship of the oil-water medium, the specific gravity of the oil is lighter than that of water, so the oil floats on the upper surface, and the water is heavier than the oil and is placed below the oil. The water below the oil flows through the water trough to the side of the partition 43 close to the clean water tank 5, and then is discharged into the inside of the clean water tank 5 through the drain pipe. The oil floating on the water accumulates on the side of the partition 43 away from the clean water tank 5. When the liquid level of the oil is higher than the waste oil discharge pipe 44, the oil floating on the water is discharged from the second box body 41 through the waste oil discharge pipe 44, realizing the oil-water separation of the cutting fluid. The water separated from the cutting fluid is collected in the clean water tank 5 for recycling. Since the cutting fluid in the clean water tank 5 is not covered by an oil film, the cutting water can contact more atmospheric oxygen, so bacteria will not breed, the cutting fluid is not easy to become smelly, and the cooling effect on the tool during processing is better.

[0033] The pre-separation mechanism 3 is used to preliminarily process the oil-containing cutting fluid, remove a large amount of oil in the cutting fluid, and then filter the cutting fluid layer by layer through a number of filter screens 42 to separate the oil and water in the cutting fluid, so as to achieve the effect of oil-water separation, make the cutting fluid not easy to become smelly, ensure the cooling effect of the cutting fluid. At the same time, the pre-separation mechanism 3 is used to initially remove oil from the cutting fluid, reduce the oil content of the cutting fluid entering the second box body 41, and reduce the possibility of solid matter generated by the solidification of the oil liquid blocking the mesh holes of the filter screen 42, ensure the service life of the filter screen 42, and enable the filter screen 42 to be used for a long time.

[0034] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A filtering device for separating oil pollution, comprising an oil-water tank (1), wherein a cutting fluid mixed with oil and water is stored in the oil-water tank (1), characterized in that: A submersible pump (2) is fixedly installed on one side of the oil-water tank (1), and a pre-separation mechanism (3) is installed on one side of the submersible pump (2). After the submersible pump (2) pumps the cutting fluid in the oil-water tank (1) into the pre-separation mechanism (3), the pre-separation mechanism (3) performs a primary oil-water separation on the cutting fluid inside. A filtering mechanism (4) is installed on one side of the pre-separation mechanism (3). The cutting fluid that has been initially degreased by the pre-separation mechanism (3) flows into the filtering mechanism (4), and the filtering mechanism (4) performs a secondary oil-water separation on the cutting fluid inside. A clean water tank (5) is fixedly connected to one side of the filtering mechanism (4), and the clean water tank (5) is used to receive water separated from the cutting fluid.

2. The filtering device for separating oil pollution according to claim 1 is characterized in that: The filtering mechanism (4) comprises a second box body (41), the inner wall of which is fixedly connected a filter screen (42), a plurality of filter screens (42) being arranged in a linear array, a partition (43) being arranged between the filter screen (42) closest to the clean water tank (5) and the second box body (41), both sides of the partition (43) being fixedly connected to the inner wall of the second box body (41), and a water channel being arranged between the lower end of the partition (43) and the bottom surface of the second box body (41).

3. The filtering device for separating oil pollution according to claim 2 is characterized in that: A waste oil discharge pipe (44) is provided on a side of the partition (43) away from the clean water tank (5), one end of the waste oil discharge pipe (44) passes through a side of the second box body (41), a drain pipe is provided between the partition (43) and the clean water tank (5), the drain pipe connects the second box body (41) with the inside of the clean water tank (5), a water inlet is provided on a side of the second box body (41) away from the clean water tank (5), and a plurality of the filter screens (42) are located between the water inlet and the drain pipe.

4. The filtering device for separating oil pollution according to claim 1 is characterized in that: The pre-separation mechanism (3) comprises a first box (31), a water suction pipe of the submersible pump (2) is connected to the inside of the oil-water tank (1), a water outlet pipe of the submersible pump (2) is connected to the inside of the first box (31), a horizontal pipe is fixedly connected to one side of the first box (31) near the bottom, a flow regulating valve (32) is installed inside the horizontal pipe, one end of the horizontal pipe is connected to the water inlet of the second box (41), and the cutting fluid in the first box (31) flows into the inside of the second box (41) through the horizontal pipe under the action of gravity; An oil removal component (33) is provided in the first box (31), and the oil removal component (33) performs preliminary separation of oil floating on the cutting fluid in the first box (31). A defoaming component (34) is provided on a side of the oil removal component (33) close to the submersible pump (2), and the defoaming component (34) is used to eliminate bubbles in the cutting fluid in the first box (31).

5. The filtering device for separating oil pollution according to claim 4 is characterized in that: The oil removal component (33) comprises a slideway (331) fixedly connected to the inside of the first box (31), one end of the slideway (331) passes through one side of the first box (31), a guide plate (332) is fixedly connected to the upper surface of the slideway (331), a shift plate (333) is rotatably connected to the inner wall of the first box (31), a drive motor is mounted on the outer wall of the first box (31), an output shaft of the drive motor is coaxially fixedly connected to a rotating shaft of the shift plate (333), the drive motor is used to drive the shift plate (333) to rotate, and when the shift plate (333) rotates, the oil floating on the cutting fluid is transported to the guide plate (332), so that the oil flows into the inside of the slideway (331) under the action of inertia.

6. The filtering device for separating oil pollution according to claim 5 is characterized in that: An oil collecting tank (334) is fixedly connected to one side of the first box body (31); one end of the slideway (331) located outside the first box body (31) is located directly above the oil collecting tank (334); a return pipe is fixedly connected to the bottom of the oil collecting tank (334); one end of the return pipe passes through a side of the second box body (41) provided with a water inlet; a shut-off valve (335) is installed on the inner wall of the return pipe.

7. The filtering device for separating oil pollution according to claim 5 is characterized in that: The defoaming component (34) comprises a cover plate (341) slidably arranged on the outside of the first box body (31); a defoaming spike (342) is fixedly connected to the top surface of the cover plate (341); a plurality of the defoaming spikes (342) are arranged in a rectangular array; a spring telescopic rod (343) is symmetrically fixedly connected to the lower surface of the cover plate (341); the lower end of the spring telescopic rod (343) is fixedly connected to the outer wall of the first box body (31); an end of the rotating shaft of the shift plate (333) away from the driving motor passes through the first box body (31) and is fixedly connected to a half gear (346); one side of the half gear (346) is meshingly connected to a rack (345); and the rack (345) is fixedly connected to one side of the cover plate (341).

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