CN216654070U

CN216654070U - Indoor formaldehyde treatment and purification device

Info

Publication number: CN216654070U
Application number: CN202220081492.1U
Authority: CN
Inventors: 胡五平
Original assignee: Shenzhen Minkang Property Management Co ltd
Current assignee: Shenzhen Minkang Property Management Co ltd
Priority date: 2022-01-12
Filing date: 2022-01-12
Publication date: 2022-06-03
Anticipated expiration: 2032-01-12

Abstract

The utility model relates to the technical field of indoor air purification devices, in particular to an indoor formaldehyde treatment and purification device, which comprises a formaldehyde purification box, wherein filter screen frames are detachably arranged at air inlets and air outlets at two sides of the formaldehyde purification box, filter screens are embedded in the filter screen frames, a U-shaped frame, an air collection hopper and a water tank are sequentially arranged in the formaldehyde purification box from the air inlets to the air outlets, a clamping groove is formed in the U-shaped frame, a filter element frame is movably clamped in the clamping groove, a filter element is arranged in the filter element frame, the outer wall of the air collection hopper is fixedly connected with the inner wall of the formaldehyde purification box, the air inlets of the air collection hopper face the direction of the U-shaped frame and are connected with a mounting frame, an air suction piece is arranged on the mounting frame, and the air outlets of the air collection hopper are connected with a gas conveying pipe. Improving the formaldehyde purification effect.

Description

Indoor formaldehyde treatment and purification device

Technical Field

The utility model relates to the technical field of indoor air purification devices, in particular to an indoor formaldehyde treatment and purification device.

Background

Formaldehyde has been determined by the world health organization to be a carcinogenic and teratogenic substance, is a well-known allergic reaction source and one of potential strong mutagens, and can cause diseases such as chronic respiratory diseases, pregnancy syndrome, leukemia and the like after being contacted with low-dose formaldehyde for a long time, and can also cause diseases such as chromosome abnormality of newborns and memory and intelligence decline of teenagers. Among all the contactees, children and pregnant women are particularly sensitive to formaldehyde, and the harm after absorption is greatest. People need to decorate new houses and office places, a large amount of artificial boards (such as plywood, large core boards, medium density fiberboard, shaving boards, laminate flooring, composite wood floors and the like) are used for decoration and furniture manufacture, while the produced artificial boards need to use a large amount of formaldehyde with high toxicity as an adhesive made of raw materials, and the formaldehyde becomes a main pollutant in indoor air because the formaldehyde in the adhesive has a long release period which is generally up to 15 years.

Materials such as plates and latex paints used in indoor decoration contain formaldehyde, which is harmful to human health, people usually keep indoor ventilation after decoration or put plants indoors for adsorption, and the mode usually needs long time and formaldehyde removal is slow, so that an indoor formaldehyde treatment and purification device is needed to solve the problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an indoor formaldehyde treatment and purification device to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme:

an indoor formaldehyde treatment and purification device comprises a formaldehyde purification box, wherein filter screen frames are detachably arranged at air inlets and air outlets on two sides of the formaldehyde purification box, filter screens are embedded in the filter screen frames, a U-shaped frame, an air collecting hopper and a water tank are sequentially arranged in the formaldehyde purification box from the air inlets to the air outlets, a clamping groove is formed in the U-shaped frame, a filter element frame is movably clamped in the clamping groove, filter elements are arranged in the filter element frame, the outer wall of the air collecting hopper is fixedly connected with the inner wall of the formaldehyde purification box, the air inlets of the air collecting hopper face the direction of the U-shaped frame and are connected with a mounting frame, an air suction piece is arranged on the mounting frame, the air outlets of the air collecting hopper are connected with a gas pipe, a partition plate is arranged between one side, close to the air collecting hopper, of the top of the water tank and the top end of the interior of the formaldehyde purification box, install the exhaust fan between the inside top of water tank top opposite side and formaldehyde purification case, the one end that the gas collecting was fought was kept away from to the gas-supply pipe runs through the baffle and extends to the inside bottom of water tank, the mounting groove has all been seted up to four corners of formaldehyde purification bottom of the case portion, install the removal damper in the mounting groove, install the controller on the preceding terminal surface of formaldehyde purification case, the controller with induced draft piece and exhaust fan electric connection.

Preferably, the top of the formaldehyde purification box is provided with an opening and closing door close to the filter element frame, the formaldehyde purification box at one end of the opening and closing door is movably hinged through a hinge, and the other end of the opening and closing door is connected with the opening and closing door through a locking assembly.

Preferably, the locking assembly comprises two locking blocks and a bolt, the two locking blocks are respectively and correspondingly arranged at the tops of the formaldehyde purification box and the opening and closing door, the two locking blocks are provided with jacks positioned on the same axis, and the bolt is inserted into the two jacks.

Preferably, the filter core sets gradually to elementary filter layer, high-efficient air filter layer and active carbon adsorption layer from the air intake of formaldehyde purification case toward the air outlet direction, be provided with sealed the pad on the outer wall of filter core frame.

Preferably, the mounting bracket is including installing cavity rectangle frame on the air collecting bucket air intake inner wall, setting up the mounting panel and a plurality of equidistant connections dead lever between mounting panel outer wall and cavity rectangle frame inner wall in cavity rectangle frame center department, form a plurality of ventilation slots between cavity rectangle frame, mounting panel and the dead lever, the piece of induced drafting is including installing the motor in mounting panel one side, the output of motor runs through the mounting panel and is connected with the induced-draft fan.

Preferably, the inside storage of water tank has formaldehyde purification liquid, all install the baffle to its central point direction slope around the inside top of water tank, four the baffle forms a whole, the top and the bottom department of water tank are connected with inlet tube and the drain pipe that runs through formaldehyde purification case respectively, be connected with the protective cover on the inlet tube, be provided with manual control valve on the drain pipe.

Preferably, four locating pins that are the rectangle setting are all installed to the air intake and the air outlet department of formaldehyde purification box, the locating hole that corresponds with the locating pin position is all seted up to four corners of filter screen frame, peg graft through locating hole and locating pin location between filter screen frame and the formaldehyde purification box, first magnet is installed in the air intake and the still embedding of air outlet department of formaldehyde purification box, one side embedding that the filter screen frame is close to the formaldehyde purification box installs the second magnet, the opposite and mutual actuation of magnetic pole of first magnet and second magnet.

Preferably, remove damper and include telescopic link, damping spring, an upper fixed plate, bottom plate and remove the wheel, an upper fixed plate is installed at the top of telescopic link, an upper fixed plate installs the inside top at the mounting groove, a bottom plate is installed to the bottom of telescopic link, the outside cover that is located the telescopic link between an upper fixed plate and the bottom plate is equipped with damping spring, remove the wheel and install the bottom at the bottom of bottom plate.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the formaldehyde purification device, air containing formaldehyde is introduced from the air inlet of the formaldehyde purification box through the air suction piece, the air containing formaldehyde is filtered through the filter element, then the air is conveyed to the bottom end inside the water tank through the air collection hopper and the air conveying pipe, the formaldehyde purification liquid is used for purifying the formaldehyde contained in the air again, the purified air rises in the water tank and then is discharged from the air outlet of the formaldehyde purification box through the exhaust fan, the formaldehyde is effectively eliminated through the combination of the filter element and the formaldehyde purification liquid, and the formaldehyde purification effect is improved.

2. According to the formaldehyde purification device, the opening and closing of the opening and closing door are facilitated through the arranged locking assembly, the filter element frame is movably clamped in the U-shaped frame, so that the filter element frame can be taken out conveniently to replace a filter element, the formaldehyde purification liquid can be replaced conveniently through the arranged water inlet pipe and the arranged water drain pipe, and the formaldehyde purification effect is effectively kept.

3. According to the formaldehyde purification box, the filter screen frame is convenient to align and install at the air inlet and the air outlet of the formaldehyde purification box through the positioning pins and the positioning holes, and the filter screen frame and the formaldehyde purification box are mutually attracted and fixed through the first magnet and the second magnet, so that the filter screen frame is convenient to disassemble and install, the filter screen is convenient to clean, and the air circulation rate is improved.

Drawings

FIG. 1 is a schematic view of the overall structure of an indoor formaldehyde treatment and purification device of the present invention;

FIG. 2 is a split view of an indoor formaldehyde treatment purification device of the present invention;

FIG. 3 is a schematic view of the internal structure of an indoor formaldehyde treatment and purification device of the present invention;

FIG. 4 is a schematic structural view of an air collecting hopper, an installation frame and an air suction member of the indoor formaldehyde treatment and purification device of the present invention;

FIG. 5 is a schematic structural view of a movable damping assembly of the indoor formaldehyde treatment purification device of the present invention.

In the figure: 1. a formaldehyde purification box; 2. a controller; 4. a filter screen frame; 401. positioning holes; 5. a filter screen; 6. opening and closing the door; 7. a locking assembly; 701. a locking block; 702. a bolt; 8. a water inlet pipe; 9. a drain pipe; 10. positioning pins; 11. a first magnet; 12. a second magnet; 13. a U-shaped frame; 1301. a clamping groove; 14. a cartridge frame; 1401. a filter element; 15. a gas collecting hopper; 16. a mounting frame; 1601. a hollow rectangular frame; 1602. mounting a plate; 1603. fixing the rod; 17. an air suction member; 1701. a motor; 1702. a suction fan; 18. a water tank; 19. a partition plate; 20. a gas delivery pipe; 21. a baffle plate; 22. an exhaust fan; 23. mounting grooves; 24. moving the shock absorbing assembly; 2401. a telescopic rod; 2402. a damping spring; 2403. an upper fixing plate; 2404. a lower fixing plate; 2405. the wheel is moved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Several embodiments of the utility model are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-5, the present invention provides a technical solution:

an indoor formaldehyde treatment and purification device comprises a formaldehyde purification box 1, wherein filter screen frames 4 are detachably mounted at air inlets and air outlets at two sides of the formaldehyde purification box 1, filter screens 5 are embedded in the filter screen frames 4, a U-shaped frame 13, a gas collecting hopper 15 and a water tank 18 are sequentially mounted in the formaldehyde purification box 1 from the air inlets to the air outlets, a clamping groove 1301 is formed in the U-shaped frame 13, a filter element frame 14 is movably clamped in the clamping groove 1301, filter elements 1401 are arranged in the filter element frame 14, the outer wall of the gas collecting hopper 15 is fixedly connected with the inner wall of the formaldehyde purification box 1, the air inlets of the gas collecting hopper 15 face the U-shaped frame 13 and are connected with a mounting frame 16, an air suction piece 17 is mounted on the mounting frame 16, the air outlets of the gas collecting hopper 15 are connected with air delivery pipes 20, a partition plate 19 is mounted between one side, close to the gas collecting hopper 15, of the top of the water tank 18 and the top end of the interior of the formaldehyde purification box 1, an exhaust fan 22 is arranged between the other side of the top of the water tank 18 and the top of the interior of the formaldehyde purification box 1, one end of the air delivery pipe 20, which is far away from the air collecting hopper 15, penetrates through the partition plate 19 and extends to the bottom end of the interior of the water tank 18, four corners of the bottom of the formaldehyde purification box 1 are respectively provided with a mounting groove 23, a movable damping component 24 is arranged in the mounting groove 23, a controller 2 is arranged on the front end surface of the formaldehyde purification box 1, the controller 2 is electrically connected with an air suction piece 17 and the exhaust fan 22, when in use, air containing formaldehyde is introduced from an air inlet of the formaldehyde purification box 1 through the air suction piece 17, the air containing formaldehyde is filtered through a filter core 1401, then the air is conveyed to the bottom end of the interior of the water tank 18 through the air collecting hopper 15 and the air delivery pipe 20, the formaldehyde-containing air is purified again through formaldehyde purification liquid, the purified air rises in the water tank 18, and then is discharged from an air outlet of the formaldehyde purification box 1 through the exhaust fan 22, the formaldehyde is effectively eliminated by combining the filter element 1401 and the formaldehyde purifying liquid, and the formaldehyde purifying effect is improved.

In this embodiment, please refer to fig. 1 and fig. 2, a door 6 is provided at a position close to the filter element frame 14 at the top of the formaldehyde purification box 1, one end of the door 6 is hinged to the formaldehyde purification box 1 through a hinge, the other end of the door 6 is connected with the door 6 through a locking component 7, the locking component 7 includes two locking blocks 701 and a latch 702, the two locking blocks 701 are respectively installed at the tops of the door 6 and the formaldehyde purification box 1 in a corresponding manner, jacks located on the same axis are provided on the two locking blocks 701, the latch 702 is inserted into the two jacks, the door 6 is convenient to open and close through the locking component 7, and the filter element frame 14 is movably clamped in the U-shaped frame 13, so as to take out the filter element frame 14 to replace the filter element 1401.

In this embodiment, please refer to fig. 2, filter core 1401 sets gradually to elementary filter layer from formaldehyde purification case 1's air intake toward the air outlet direction, high-efficient air filter layer and active carbon adsorption layer, be provided with sealed the pad on filter core frame 14's the outer wall, can filter macromolecule granule through the elementary filter layer that sets up, can carry out micromolecule and harmful gas through the high-efficient air filter layer that sets up and filter, filter harmful substance such as formaldehyde in with the air through the active carbon adsorption layer that sets up, be convenient for indoor formaldehyde purification, improve the leakproofness between filter core frame 14 and the 1 inner wall of formaldehyde purification case through the sealed pad that sets up.

In this embodiment, please refer to fig. 3 and 4, the mounting bracket 16 includes a hollow rectangular frame 1601 installed on an inner wall of an air inlet of the air collecting hopper 15, a mounting plate 1602 installed at a center of the hollow rectangular frame 1601, and a plurality of fixing rods 1603 connected between an outer wall of the mounting plate 1602 and an inner wall of the hollow rectangular frame 1601 at equal intervals, a plurality of ventilation slots are formed between the hollow rectangular frame 1601, the mounting plate 1602 and the fixing rods 1603, the air suction member 17 includes a motor 1701 installed on one side of the mounting plate 1602, an output end of the motor 1701 penetrates through the mounting plate 1602 and is connected with an air suction fan 1702, and air purified by the filter cartridge 1401 can flow into the air collecting hopper 15 through the provided ventilation slots.

In this embodiment, please refer to fig. 1 and fig. 3, the inside storage of water tank 18 has formaldehyde purification liquid, all install the baffle 21 to its central point direction slope around the inside top of water tank 18, four baffles 21 form a whole, the top and the bottom department of water tank 18 are connected with inlet tube 8 and the drain pipe 9 that runs through formaldehyde purification box 1 respectively, be connected with the protective cover on the inlet tube 8, be provided with the manual control valve on the drain pipe 9, can avoid the formaldehyde purification liquid spill when removing in the water tank 18 through the baffle 21 that sets up, be convenient for change formaldehyde purification liquid through inlet tube 8 and the drain pipe 9 that set up, thereby effectively keep formaldehyde purification effect.

In this embodiment, referring to fig. 2, four positioning pins 10 are installed at the air inlet and the air outlet of the formaldehyde purifying box 1, four corners of the filter screen frame 4 are respectively provided with positioning holes 401 corresponding to the positions of the positioning pins 10, the filter screen frame 4 and the formaldehyde purifying box 1 are inserted and connected in a positioning manner through the positioning holes 401 and the positioning pins 10, the first magnet 11 is further inserted and installed at the air inlet and the air outlet of the formaldehyde purifying box 1, the second magnet 12 is inserted and installed at one side of the filter screen frame 4 close to the formaldehyde purifying box 1, the first magnet 11 and the second magnet 12 have opposite magnetic poles and attract each other, the filter screen frame 4 is conveniently installed at the air inlet and the air outlet of the formaldehyde purifying box 1 in an aligned manner through the positioning pins 10 and the positioning holes 401, and the filter screen frame 4 and the formaldehyde purifying box 1 are attracted and fixed with each other through the first magnet 11 and the second magnet 12, thereby be convenient for the dismantlement and the installation of filter screen frame 4, conveniently wash filter screen 5, improve the air circulation rate.

In this embodiment, referring to fig. 3 and 5, the movable damping assembly 24 includes an expansion link 2401, a damping spring 2402, an upper fixing plate 2403, a lower fixing plate 2404 and a movable wheel 2405, the upper fixing plate 2403 is installed at the top of the expansion link 2401, the upper fixing plate 2403 is installed at the top end of the installation groove 23, the lower fixing plate 2404 is installed at the bottom of the expansion link 2401, the damping spring 2402 is sleeved on the outer side of the expansion link 2401 between the upper fixing plate 2403 and the lower fixing plate 2404, the movable wheel 2405 is installed at the bottom of the lower fixing plate 2404, the movable wheel 2405 is convenient for the movement of the device, when the device moves, the damping spring 2402 is compressed by contraction of the expansion link 2401, vibration during the movement is absorbed by the damping spring 2402, and influence on the device is avoided.

The working principle of the utility model is as follows: when the formaldehyde purification box is used, air containing formaldehyde is introduced from an air inlet of the formaldehyde purification box 1 through the air suction piece 17, the air containing the formaldehyde is filtered through the filter element 1401, macromolecular particles can be filtered through the arranged primary filter layer, micromolecules and harmful gases can be filtered through the arranged high-efficiency air filter layer, harmful substances such as the formaldehyde in the air are filtered through the arranged active carbon adsorption layer, then the air is conveyed to the inner bottom end of the water tank 18 through the air collection hopper 15 and the air conveying pipe 20, the formaldehyde contained in the air is purified again through formaldehyde purification liquid, the purified air rises in the water tank 18 and is discharged from an air outlet of the formaldehyde purification box 1 through the exhaust fan 22, the opening and closing of the opening and closing door 6 are facilitated through the locking component 7, the filter element frame 14 is movably clamped in the U-shaped frame 13, so that the filter element frame 14 can be taken out to replace the filter element 1401, the formaldehyde purification liquid is convenient to replace through the arranged water inlet pipe 8 and the arranged water outlet pipe 9, so that the formaldehyde purification effect is effectively kept, the filter screen frame 4 and the formaldehyde purification box 1 are mutually attracted and fixed through the first magnet 11 and the second magnet 12, so that the filter screen frame 4 is convenient to detach and mount, the filter screen 5 is convenient to clean, the air circulation rate is improved, and the formaldehyde is effectively eliminated through the combination of the filter element 1401 and the formaldehyde purification liquid, so that the formaldehyde purification effect is improved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an indoor formaldehyde treatment purifier, includes formaldehyde purifying box (1), its characterized in that: the formaldehyde purification box is characterized in that filter screen frames (4) are detachably mounted at air inlets and air outlets on two sides of the formaldehyde purification box (1), filter screens (5) are embedded in the filter screen frames (4), U-shaped frames (13), air collecting hoppers (15) and a water tank (18) are sequentially mounted in the formaldehyde purification box (1) from the air inlets to the air outlets, a clamping groove (1301) is formed in the U-shaped frames (13), filter element frames (14) are movably clamped in the clamping groove (1301), filter elements (1401) are arranged in the filter element frames (14), the outer walls of the air collecting hoppers (15) are fixedly connected with the inner wall of the formaldehyde purification box (1), the air inlets of the air collecting hoppers (15) face the U-shaped frames (13) and are connected with mounting frames (16), air suction pieces (17) are mounted on the mounting frames (16), and air outlets of the air collecting hoppers (15) are connected with air conveying pipes (20), install baffle (19) between the inside top of one side that the top of water tank (18) is close to air collecting bucket (15) and formaldehyde purification case (1), install exhaust fan (22) between the inside top of water tank (18) top opposite side and formaldehyde purification case (1), the one end that air collecting bucket (15) was kept away from in gas pipe (20) runs through baffle (19) and extends to the inside bottom of water tank (18), mounting groove (23) have all been seted up to four corners of formaldehyde purification case (1) bottom, install in mounting groove (23) and remove damper (24), install controller (2) on the preceding terminal surface of formaldehyde purification case (1), controller (2) and induced draft piece (17) and exhaust fan (22) electric connection.

2. The indoor formaldehyde treatment and purification device according to claim 1, wherein: the formaldehyde purifying box is characterized in that an opening and closing door (6) is arranged at the position, close to the filter element frame (14), of the top of the formaldehyde purifying box (1), one end of the opening and closing door (6), the formaldehyde purifying box (1) is movably hinged through a hinge, and the other end of the opening and closing door (6) is connected with the opening and closing door (6) through a locking assembly (7).

3. The indoor formaldehyde treatment and purification device according to claim 2, wherein: the locking assembly (7) comprises two locking blocks (701) and a bolt (702), the two locking blocks (701) are respectively and correspondingly arranged at the tops of the formaldehyde purification box (1) and the opening and closing door (6), jacks located on the same axis are formed in the two locking blocks (701), and the bolt (702) is inserted into the two jacks.

4. The indoor formaldehyde treatment and purification device according to claim 1, wherein: the filter element (1401) is sequentially arranged into a primary filtering layer, a high-efficiency air filtering layer and an active carbon adsorption layer from an air inlet to an air outlet of the formaldehyde purification box (1), and a sealing gasket is arranged on the outer wall of the filter element frame (14).

5. The indoor formaldehyde treatment and purification device according to claim 1, wherein: mounting bracket (16) including installing hollow rectangular frame (1601) on air-collecting bucket (15) air intake inner wall, setting up mounting panel (1602) and a plurality of equidistant connection dead lever (1603) between mounting panel (1602) outer wall and hollow rectangular frame (1601) inner wall at hollow rectangular frame (1601) center department, form a plurality of ventilation slots between hollow rectangular frame (1601), mounting panel (1602) and dead lever (1603), induced draft piece (17) are including installing motor (1701) in mounting panel (1602) one side, the output of motor (1701) runs through mounting panel (1602) and is connected with suction fan (1702).

6. The indoor formaldehyde treatment and purification device according to claim 1, wherein: the inside storage of water tank (18) has formaldehyde purification liquid, all install around on the inside top of water tank (18) baffle (21) to its central point direction slope, four baffle (21) form a whole, the top and the bottom department of water tank (18) are connected with inlet tube (8) and drain pipe (9) that run through formaldehyde purification case (1) respectively, be connected with the protective cover on inlet tube (8), be provided with manual control valve on drain pipe (9).

7. The indoor formaldehyde treatment and purification device according to claim 1, wherein: air intake and air outlet department of formaldehyde purification case (1) all install four locating pin (10) that are the rectangle setting, locating hole (401) that correspond with locating pin (10) position are all seted up to four corners of filter screen frame (4), peg graft through locating hole (401) and locating pin (10) location between filter screen frame (4) and the formaldehyde purification case (1), first magnet (11) are installed in air intake and the still embedding of air outlet department of formaldehyde purification case (1), one side embedding that filter screen frame (4) are close to formaldehyde purification case (1) installs second magnet (12), the opposite and mutual actuation of magnetic pole of first magnet (11) and second magnet (12).

8. The indoor formaldehyde treatment and purification device according to claim 1, wherein: remove damper (24) and include telescopic link (2401), damping spring (2402), upper fixed plate (2403), bottom plate (2404) and remove wheel (2405), upper fixed plate (2403) are installed to the top of telescopic link (2401), the inside top at mounting groove (23) is installed to upper fixed plate (2403), bottom plate (2404) is installed to the bottom of telescopic link (2401), the outside cover that is located telescopic link (2401) between upper fixed plate (2403) and bottom plate (2404) is equipped with damping spring (2402), the bottom at bottom plate (2404) is installed to removal wheel (2405).