A washing machine

Abstract

The present invention discloses a washing machine, which includes a lint filter and a cleaning device; the lint filter is arranged between the bottom of the inner tub and the bottom of the outer tub; the cleaning device is arranged on the outer tub of the washing machine and is used to remove the lint at the bottom of the lint filter. By arranging the cleaning device on the outer tub and removing the lint at the bottom of the lint filter through the cleaning device, the lint will be discharged with the water when the washing machine drains, avoiding the problem that the lint filter is blocked and the lint filtering function of the washing machine fails.

Description

Technical Field

[0001] The present invention belongs to the field of washing machines, and more specifically, relates to a washing machine. Background Art

[0002] Currently, self-cleaning washing machines have the function of self-filtering lint. This is achieved by externally mounting a flange plate at the bottom of the inner tub and setting up a filter assembly composed of a stainless-steel filter screen between the flange plate at the bottom of the inner tub and the outer tub. The disadvantage of this method is that after long-term use, the stainless-steel filter screen will be blocked by fine flocculent lint, resulting in the failure of the filtering function.

[0003] In the inner tub of the washing machine, as the agitator rotates, water and lint enter the bottom of the outer tub under the action of centrifugal force. When the agitator rotates, the water at the bottom of the agitator is discharged out of the inner tub under the action of centrifugal force. A pressure difference is formed between the area near the axis below the agitator and the outer area of the bottom of the inner tub. The water in the outer tub will circulate from the outside of the bottom of the inner tub through the self-cleaning filter screen and into the inner tub. Water can pass through the filter screen, but part of the lint is blocked on the lower surface by the self-cleaning filter screen, preventing the lint from returning to the inner tub. When the washing machine drains water, the lint and water will be discharged together through the drain pipe. However, after long-term accumulation, there will still be some flocculent lint sticking to the lower surface of the self-cleaning filter screen, blocking the filter holes.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a washing machine capable of removing the lint accumulated at the bottom of the lint filter for a long time.

[0006] To solve the above technical problem, the basic concept of the technical solution adopted by the present invention is: to provide a washing machine, including,

[0007] A lint filter, arranged between the bottom of the inner tub and the bottom of the outer tub;

[0008] A cleaning device, arranged on the bottom of the outer tub of the washing machine, for removing the lint at the bottom of the lint filter.

[0009] By arranging a cleaning device on the outer tub of the present invention and removing the lint at the bottom of the lint filter through the cleaning device, the lint will be discharged with the water when the washing machine drains water, avoiding the problem that the lint filter is blocked and the lint filtering function of the washing machine fails.

[0010] Further, the upper end of the cleaning device abuts against the bottom of the lint filter for scraping the lint at the bottom of the lint filter.

[0011] Further, a part of the cleaning device is telescopically inserted through the bottom of the outer tub for extending upward / retracting downward to abut against / disengage from the bottom of the lint filter.

[0012] When it is necessary to clean the lint filter, control a part of the cleaning device to extend upward to abut against the bottom of the lint filter, and then control the inner barrel of the washing machine to rotate slowly. A part of the cleaning device will scrape off the flocculent lint at the bottom of the lint filter. When the washing machine drains water, the lint will be discharged with the water, avoiding the problem that the lint filter is blocked and the lint filtering function of the washing machine fails.

[0013] Furthermore, mounting holes are provided on the bottom of the outer barrel, which are arranged opposite to the lint filter; the cleaning device includes,

[0014] a sealing structure, which is mounted on the bottom of the outer barrel and used to block the mounting holes. The sealing structure includes a deformation part, and the deformation part penetrates through the mounting holes;

[0015] a telescopic rod, which penetrates through the mounting holes, and the upper end abuts against the deformation part;

[0016] a driving mechanism, which is arranged on the outside of the bottom of the outer barrel and connected to the telescopic rod, and is used to drive the telescopic rod to move upward, driving the deformation part of the sealing structure to move upward to abut against the bottom of the lint filter;

[0017] Preferably, the sealing structure is a sealing sleeve.

[0018] Furthermore, the driving mechanism is an electromagnetic driving mechanism, which is used to drive the telescopic rod to move upward when powered on, and the deformation part restores its deformation to drive the telescopic rod to retract downward to its original position when powered off.

[0019] Furthermore, an upwardly flanged connecting platform is provided at the upper end of the driving mechanism;

[0020] The sealing structure further includes a fixing part, the fixing part is connected to the outer periphery of the deformation part, the fixing part is clamped between the connecting platform and the outside of the bottom of the outer barrel, and the driving mechanism, the sealing structure and the bottom of the outer barrel are connected by connecting pieces;

[0021] Preferably, the fixing part is an annular structure.

[0022] Furthermore, the deformation part includes a connected first deformation part and a second deformation part,

[0023] The first deformation part is an annular bending structure, which penetrates through the mounting holes and is used to deform when the telescopic rod moves up and down;

[0024] The second deformation part is an upwardly convex arc surface, which protrudes upward from the first deformation part out of the mounting holes and is used to deform and abut against the bottom of the lint filter when the telescopic rod moves upward.

[0025] Furthermore, an annular protrusion extending radially inwards along the mounting hole is provided at the connection between the first deformation part and the second deformation part;

[0026] An annular groove matching the annular protrusion is provided on the outer peripheral wall of the telescopic rod, and the annular protrusion is clamped in the annular groove.

[0027] Furthermore, there is a gap between the top wall of the telescopic rod and the second deformation part;

[0028] Preferably, a pit is provided on the top wall of the telescopic rod, and a cavity is formed between the pit and the second deformation part.

[0029] Furthermore, the driving mechanism is sleeved on the outer periphery of the telescopic rod, and a positioning snap ring is sleeved on the lower end of the telescopic rod protruding from the driving mechanism for restricting the upward movement distance of the telescopic rod.

[0030] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0031] (1) By providing a cleaning device on the outer barrel of the present invention, the lint at the bottom of the lint filter is removed by the cleaning device, and the lint will be discharged with the water when the washing machine drains water, avoiding the problem that the lint filter is blocked and the lint filtering function of the washing machine fails.

[0032] (2) When it is necessary to clean the lint filter, control a part of the structure of the cleaning device to extend upwards to abut against the bottom of the lint filter, and then control the inner barrel of the washing machine to rotate at a low speed, and a part of the structure of the cleaning device will scrape off the flocculent lint at the bottom of the lint filter. The lint will be discharged with the water when the washing machine drains water, avoiding the problem that the lint filter is blocked and the lint filtering function of the washing machine fails.

[0033] (3) When the second deformation part of the sealing structure abuts against the filter screen, the second deformation part can be partially compressed into the pit, with a large compression amount, and at the same time, the contact area with the filter screen is increased, which is convenient to scrape off the lint in a larger range on the filter screen and improves the lint removal ability of the cleaning device.

[0034] The following further describes in detail the specific embodiments of the present invention with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, as part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not unduly limit the present invention. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings:

[0036] Figure 1 is a schematic diagram of the non-working state of the cleaning device of the washing machine of the present invention;

[0037] Figure 2 is a schematic diagram of the working state of the cleaning device of the washing machine of the present invention;

[0038] Figure 3 is the present invention Figure 1 an enlarged schematic diagram of part A in;

[0039] Figure 4 is the present invention Figure 2 an enlarged schematic diagram of part B in.

[0040] In the figure: 1. Cleaning device; 11. Sealing structure; 111. Fixed part; 112. First deformation part; 113. Second deformation part; 114. Annular convex part; 12. Telescopic rod; 121. Annular groove; 122. Pit; 13. Driving mechanism; 131. Connecting platform; 132. Boss; 14. Connector; 15. Positioning snap ring; 2. Inner barrel; 21. Inner barrel bottom; 22. Drainage central hole; 23. Opening; 24. Inner barrel flange; 3. Outer barrel; 31. Outer barrel bottom; 311. Mounting hole; 4. Lint filter.

[0041] It should be noted that these drawings and the text description are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0043] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention 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 therefore should not be construed as a limitation to the present invention.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should 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 a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] As Figures 1 to 4 shown, the washing machine according to the present invention has the function of cleaning the lint filter 4. The washing machine includes a lint filter 4 and a cleaning device 1. The lint filter 4 is disposed between the inner tub bottom 21 and the outer tub bottom 31, and the cleaning device 1 is disposed on the outer tub 3 of the washing machine for removing the lint at the bottom of the lint filter 4. The lint filter 4 is used for filtering the lint in the washing water of the washing machine.

[0046] In the present invention, by providing the cleaning device 1 on the outer tub bottom 31 and removing the lint at the bottom of the lint filter 4 through the cleaning device 1, the lint will be discharged with the water when the washing machine drains, avoiding the problem that the lint filter is blocked and the lint filtering function of the washing machine fails.

[0047] A preferred solution is that the upper end of the cleaning device abuts against the bottom of the lint filter for scraping the lint at the bottom of the lint filter. Preferably, the cleaning device includes a brush, and the brush abuts against the bottom of the lint filter. When the inner tub rotates, the brush can scrape the lint at the bottom of the lint filter without damaging the lint filter.

[0048] As Figures 1 to 2 shown, another preferred solution is that a part of the cleaning device 1 is telescopically disposed in the outer tub bottom 31 for extending upward / retracting downward to abut against / detach from the bottom of the lint filter 4.

[0049] When it is necessary to clean the lint filter 4, control a part of the cleaning device 1 to extend upward to abut against the bottom of the lint filter 4, and then control the inner tub 2 of the washing machine to rotate slowly. A part of the cleaning device 1 will scrape the flocculent lint at the bottom of the lint filter 4. The lint will be discharged with the water when the washing machine drains, avoiding the problem that the lint filter is blocked and the lint filtering function of the washing machine fails.

[0050] After the lint scraping is completed, control the inner tub 2 of the washing machine to stop rotating, and a part of the cleaning device 1 retracts downward, and at this time it no longer abuts against the bottom of the lint filter 4.

[0051] Preferably, the lint filter 4 is fixed to the bottom 21 of the inner tub of the washing machine. The outer diameter of the lint filter 4 is larger than the diameter of the drainage central hole 22 of the bottom 21 of the inner tub, ensuring that the washing water passes through the lint filter 4 during the flow process, making the filtration more thorough. An opening 23 for the washing water to pass through is provided on the bottom 21 of the inner tub. The lint filter 4 realizes its filtering function by circulating the washing water flowing from the bottom of the lint filter 4 through the lint filter 4 and into the inner tub 2, and realizes its cleaning function by draining the washing water flowing through the lint filter 4 from the drainage central hole 22.

[0052] When the washing machine is running, the flow direction of the washing water includes a first flow path and a second flow path. The first flow path is as follows: as the agitator of the washing machine rotates, the washing water flows from the inside of the inner tub 2 through the gap between the inner tub 2 and the outer tub 3, the lint filter 4, and the bottom 21 of the inner tub, and then returns to the inside of the inner tub 2. The lint in the washing water is collected at the lint filter 4.

[0053] The second flow path is that the washing water flows from the inside of the inner tub 2 successively through the opening 23 of the bottom 21 of the inner tub, the lint filter 4, and the bottom 21 of the inner tub and then returns to the inside of the inner tub 2.

[0054] After being cleaned by the cleaning device 1, during the drainage stage of the cleaning device 1, the washing water flows from the inside of the inner tub 2 through the bottom 21 of the inner tub and the lint filter 4 and is discharged from the drain pipe. The washing water flushes the lint filter and can also discharge the lint scraped from the bottom of the lint filter, avoiding the pollution caused by lint accumulation, and there is no need to manually disassemble the lint filter for cleaning, improving the filtering ability of the washing machine.

[0055] Preferably, the bottom 21 of the inner tub is provided with an inner tub flange 24, and the lint filter 4 is installed at the bottom of the inner tub flange 24 and is located between the inner tub flange 24 and the bottom 31 of the outer tub. The opening 23 is provided on the inner tub flange 24.

[0056] As Figures 3 to 4 shown, an installation hole 311 is provided on the bottom 31 of the outer tub and is arranged opposite to the lint filter 4. A part of the structure of the cleaning device 1 is telescopically arranged in the installation hole 311.

[0057] The cleaning device 1 includes a sealing structure 11 (refer to Figures 1 to 2 ), a telescopic rod 12, and a driving mechanism 13.

[0058] The sealing structure 11 is installed on the bottom 31 of the outer tub and is used to block the installation hole 311. The sealing structure 11 includes a deformable part, and the deformable part passes through the installation hole 311. The deformable part is made of an elastic material or a memory material and can be telescopically deformed under the action of an external force. Preferably, the sealing structure 11 is made of an elastic material.

[0059] The telescopic rod 12 is inserted into the mounting hole 311, and its upper end abuts against the deformable part.

[0060] The driving mechanism 13 is arranged outside the bottom 31 of the outer barrel and is connected to the telescopic rod 12. It is used to drive the telescopic rod 12 to move upward, driving the deformable part of the sealing structure 11 to move upward to abut against the bottom of the lint filter 4. The driving mechanism 13 drives the telescopic rod 12 to move up and down, so that the telescopic rod 12 squeezes the deformable part upward, stretches and squeezes the deformable part to contact the bottom of the lint filter 4, or the telescopic rod 12 moves downward, and the deformable part resumes its shape and disengages from abutting against the bottom of the lint filter 4.

[0061] Preferably, the sealing structure 11 is a sealing sleeve. The lint filter 4 includes a filter screen, and the outer diameter of the filter screen is larger than the aperture of the drainage central hole 22 of the inner barrel 2. The length of the mounting hole 311 from the center of the filter screen is equal to the length of the mounting hole 311 from the outer peripheral edge of the filter screen. Preferably, the filter screen is circular, and the mounting hole 311 is arranged at the relative position in the middle of the radius between the outer barrel 3 and the filter screen.

[0062] The driving mechanism 13 is an electromagnetic driving mechanism, which is used to drive the telescopic rod 12 to move upward when powered on. When powered off, the telescopic rod 12 no longer receives the upward electromagnetic driving force, and the deformable part resumes its deformation to drive the telescopic rod 12 to retract downward to its original position. The telescopic rod 12 is the core of the electromagnetic driving mechanism and is a metal telescopic rod 12.

[0063] During the use of the washing machine, after every half month or a certain period, the washing machine is controlled to execute or the washing machine automatically executes an anti-blocking cleaning program. Preferably, the anti-blocking cleaning program is executed when the washing machine drains water.

[0064] The anti-blocking cleaning program includes the following control steps: S1. The electromagnetic driving mechanism is powered on to eject the telescopic rod; S2. The inner barrel rotates slowly and evenly for a certain period of time; S3. The inner barrel stops rotating and the electromagnetic driving mechanism is powered off.

[0065] In step S1, the electromagnetic driving mechanism is powered on to eject the telescopic rod, and the telescopic rod squeezes the deformable part of the sealing structure upward to abut against the lint filter.

[0066] In step S2, the inner barrel rotates slowly and evenly for a certain period of time, and the deformable part abuts against the bottom of the lint filter to scrape off the lint on the lint filter.

[0067] In step S3, the inner barrel stops rotating and the electromagnetic driving mechanism is powered off, the telescopic rod retracts downward, and the deformable part resumes its deformation and no longer abuts against the lint filter.

[0068] Further, an upper end of the driving mechanism 13 is provided with a connecting platform 131 extending outwards with a flanging.

[0069] The sealing structure 11 further includes a fixing portion 111, the fixing portion 111 is connected to the outer periphery of the deformable portion, the fixing portion 111 is clamped between the connecting platform 131 and the outer side of the outer barrel bottom 31, and the driving mechanism 13, the sealing structure 11 and the outer barrel bottom 31 are connected by a connecting member 14. Preferably, the fixing portion 111 is an annular structure.

[0070] The upper and lower sides of the fixing portion 111 are respectively in close contact with the outer wall of the outer barrel bottom 31 and the upper wall of the connecting platform 131. The connecting platform 131, the fixing portion 111 and the outer barrel bottom 31 are respectively provided with mating assembly holes, and the connecting member 14 is installed in the assembly holes. Preferably, the connecting member 14 is a screw or a bolt.

[0071] The top of the driving mechanism 13 is provided with a convex platform 132 protruding upwards, the convex platform 132 is connected to the connecting platform 131 in a transitional manner, and the convex platform 132 is installed in the mounting hole 311 of the outer barrel 3, which can be used to position and install the driving mechanism 13. The deformable portion is clamped between the mounting hole 311 and the convex platform 132, which can play a role in sealing and fixing. Preferably, the convex platform 132 is an annular convex platform.

[0072] The deformable portion of the sealing structure 11 protrudes upwards from the fixing portion 111 and passes through the mounting hole 311. The deformable portion includes a connected first deformable portion 112 and a second deformable portion 113.

[0073] Further, the first deformable portion 112 is an annular bending structure, the first deformable portion 112 passes through the mounting hole 311 and is used for deforming when the telescopic rod 12 moves up and down. A part of the first deformable portion 112 is located between the mounting hole 311 and the peripheral wall of the convex platform 132 of the driving mechanism 13. Another part of the first deformable portion 112 protrudes upwards from the mounting hole 311 of the outer barrel 3 and is in contact with the top wall of the convex platform 132 in the non-working state and is stretched in the working state.

[0074] The second deformable portion 113 includes an upwardly protruding arc surface, the second deformable portion 113 protrudes upwards from the first deformable portion 112 from the mounting hole 311, and the arc surface is used for deforming and pressing against the bottom of the lint filter 4 when the telescopic rod 12 moves upwards. The second deformable portion 113 is bowl-shaped or sleeve-shaped.

[0075] The fixing part 111 of the sealing structure 11 is located outside the bottom 31 of the outer barrel, the second deformation part 113 is located in the outer barrel 3 above the mounting hole 311, the first deformation part 112 is connected between the fixing part 111 and the second deformation part 113, and the first deformation part 112 is inserted through the mounting hole 311.

[0076] At the connection between the first deformation part 112 and the second deformation part 113, there is an annular protruding part 114 extending radially inwards along the mounting hole 311. An annular groove 121 matching the annular protruding part 114 is provided on the outer peripheral wall of the telescopic rod 12, and the annular protruding part 114 is clamped on the annular groove 121. The second deformation part 113 is sleeved on the upper end of the telescopic rod 12.

[0077] The annular protruding part 114 and the second deformation part 113 form a semi-open space. The telescopic rod 12 above the annular groove 121 is installed in the semi-open space. The peripheral wall of the telescopic rod 12 above the annular groove 121 matches the concave side of the second deformation part 113.

[0078] There is a gap between the top wall of the telescopic rod 12 and the second deformation part 113, which is used to leave a certain flow rate between the telescopic rod 12 and the filter screen, preventing the telescopic rod from scratching and damaging the filter screen.

[0079] Preferably, a concave pit 122 is provided on the top wall of the telescopic rod 12, and a cavity is formed between the concave pit 122 and the second deformation part 113.

[0080] When the second deformation part 113 of the sealing structure 11 abuts against the filter screen, the second deformation part 113 can be partially compressed into the concave pit 122, with a large compression amount. At the same time, the contact area with the filter screen is increased, which is convenient for scraping off the lint in a larger range on the filter screen and improves the lint removal ability of the cleaning device.

[0081] The driving mechanism 13 is sleeved on the outer periphery of the telescopic rod 12, and a positioning snap ring 15 is sleeved on the lower end of the telescopic rod 12 protruding from the driving mechanism 13, which is used to limit the upward movement distance of the telescopic rod 12.

[0082] By setting the positioning snap ring 15, it can be avoided that the upward movement distance of the telescopic rod 12 is too large, damaging the sealing structure 11 or wearing the lint filter 4, and it can also be avoided that the upward movement distance of the telescopic rod 12 is too small, causing the sealing structure 11 not to abut against the lint filter 4 and resulting in poor cleaning effect.

[0083] The above are only the preferred embodiments of the present invention, and there is no limitation to the present invention in any form. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content prompted above within the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. A washing machine, characterized in that: including a lint filter disposed between the bottom of the inner tub and the bottom of the outer tub; a cleaning device, partially telescopically disposed in the bottom of the outer tub of the washing machine, for extending upward or retracting downward to abut or disengage from the bottom of the lint filter to remove lint at the bottom of the lint filter; an installation hole is provided on the bottom of the outer tub, which is disposed opposite to the lint filter; the cleaning device includes a sealing structure installed on the bottom of the outer tub for plugging the installation hole, the sealing structure includes a deformation part, and the deformation part is disposed through the installation hole; a telescopic rod disposed through the installation hole, and the upper end thereof abuts against the deformation part; a driving mechanism disposed outside the bottom of the outer tub and connected to the telescopic rod for driving the telescopic rod to move upward, driving the deformation part of the sealing structure to move upward to abut against the bottom of the lint filter.

2. The washing machine according to claim 1, characterized in that: The upper end of the cleaning device abuts against the bottom of the lint filter for scraping the lint at the bottom of the lint filter.

3. The washing machine according to claim 1, characterized in that: The sealing structure is a sealing sleeve.

4. The washing machine according to claim 1, characterized in that: The driving mechanism is an electromagnetic driving mechanism for driving the telescopic rod to move upward when powered on, and the deformation part restores deformation to drive the telescopic rod to retract downward to its original position when powered off.

5. The washing machine according to any one of claims 1 - 4, characterized in that: The upper end of the driving mechanism is provided with a connecting platform extending outward in a flanging manner; the sealing structure further includes a fixing part, the fixing part is connected to the outer periphery of the deformation part, the fixing part is clamped between the connecting platform and the outside of the bottom of the outer tub, and the driving mechanism, the sealing structure and the bottom of the outer tub are connected by a connecting member.

6. The washing machine according to claim 5, characterized in that: The fixing part is an annular structure.

7. The washing machine according to claim 6, characterized in that: The deformation part includes a first deformation part and a second deformation part connected to each other, the first deformation part is an annular bending structure disposed through the installation hole for deforming when the telescopic rod moves up and down; the second deformation part is an upwardly convex arc surface protruding upward from the first deformation part out of the installation hole for deforming to abut against the bottom of the lint filter when the telescopic rod moves upward.

8. The washing machine according to claim 7, characterized in that: An annular protrusion extending radially inward along the installation hole is provided at the connection between the first deformation part and the second deformation part; an annular groove matching the annular protrusion is provided on the outer peripheral wall of the telescopic rod, and the annular protrusion is clamped in the annular groove.

9. The washing machine according to claim 7, characterized in that: A gap is provided between the top wall of the telescopic rod and the second deformation part.

10. The washing machine according to claim 9, characterized in that: A pit is provided on the top wall of the telescopic rod, and a cavity is formed between the pit and the second deformation part.

11. The washing machine according to claim 1, characterized in that: The driving mechanism is sleeved on the outer periphery of the telescopic rod, and a positioning snap ring is sleeved on the lower end of the telescopic rod protruding from the driving mechanism for limiting the upward movement distance of the telescopic rod.

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