A heating and ventilation system for public buildings

Abstract

The application relates to the field of heating and ventilation technology, in particular to a heating and ventilation system for public buildings. The heating and ventilation system for public buildings comprises a supporting seat, a heating and ventilation body, a filter screen mechanism, a fixing seat, an adjusting mechanism and a limiting protection mechanism. The beneficial effect is that the plug-in plate is separated from the plug-in groove, the limiting of the protection turning plate is cancelled, the protection turning plate is turned outward, the gas pipeline enters the inside of the supporting plate, the soft pad arranged in the inside of the supporting plate protects the gas pipeline, the damage of the gas pipeline is avoided, the protection turning plate is turned towards the plug-in groove, the plug-in plate is then plugged in the inside of the plug-in plate to limit and fix the protection turning plate, at this time, the limiting top-holding spring holds the limiting top-holding rod, the limiting top-holding rod drives the limiting top-holding block to always adhere to the gas pipeline, so that the shaking of the gas pipeline is prevented, the kinetic energy generated by the shaking of the gas pipeline is absorbed, the gas pipeline is limited and protected, the damage of the gas pipeline is effectively reduced, and the gas pipelines with different diameters can be protected.

Description

Technical Field

[0001] The present invention relates to the technical field of heating, ventilation and air conditioning, and specifically to a heating, ventilation and air conditioning system for public buildings. Background Art

[0002] Heating, ventilation and air conditioning include three aspects: heating, ventilation, and air conditioning. These three aspects are abbreviated as HVAC. The main functions of HVAC include: heating, ventilation, and air conditioning. Taking the combined abbreviation of these three functions is HVAC. In public buildings, HVAC is often installed to improve the indoor environment.

[0003] When some existing HVAC are installed outdoors, their conveying pipelines are often not easy to fix, and it is necessary to manually pour support frames to support them. These support frames are easily damaged by the environment after long-term use, resulting in a decline in the support effect of the support frames. Replacing and installing are relatively troublesome. At the same time, the air filters on the sides of HVAC are often integrally fixed and installed, which is not convenient for disassembly and cleaning of the filters, and it is easy to reduce the working efficiency and service life of HVAC. Summary of the Invention

[0004] The purpose of the present invention is to provide a heating, ventilation and air conditioning system for public buildings to solve the problem of supporting the conveying pipeline.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A heating, ventilation and air conditioning system for public buildings, the heating, ventilation and air conditioning system for public buildings includes:

[0007] A support base, with a support and protection mechanism arranged above it;

[0008] The HVAC main body is arranged above the support and protection mechanism, and the HVAC main body is connected with an air conveying pipeline;

[0009] A filter mechanism is arranged on the surface of the HVAC main body;

[0010] A fixing base, with screw holes opened on its surface, and is fixed by bolts in cooperation with the screw holes;

[0011] An adjusting mechanism is arranged on the top surface of the fixing base; and

[0012] A limit and protection mechanism is arranged above the adjusting mechanism, and cooperates with the support and protection mechanism to limit, protect and support the air conveying pipeline.

[0013] Preferably, the filter mechanism includes a filter plate, a push plate, a clamping block, a limit spring and a clamping groove. The clamping groove is opened on the surface of the HVAC main body. Clamping grooves are opened on both side surfaces of the filter plate, and the cross sections of the clamping groove and the clamping slot are both in a "C" - shaped structure, and the limit spring and the clamping block are both arranged inside the clamping groove.

[0014] Preferably, one end of the limiting spring is connected to the engaging groove, the other end is connected to the clamping block, and the limiting spring is always in a compressed state. A push plate is provided on the surface of the filter screen plate away from the HVAC body. The push plate is in a "T" - shaped structure, passes through the filter screen plate and is connected to the clamping block. Anti - slip bumps are provided on the surface of the push plate away from the filter screen plate.

[0015] Preferably, the support and protection mechanism includes a support rod, a baffle plate, and a limiting groove. The limiting groove is opened on the surface of the support seat, and the baffle plate passes through the limiting groove and is inserted at the upper end of the support seat. The support rod is fixed at the upper end of the support seat, and the distance between the support rod and the baffle plate is equal to the diameter of the gas transmission pipeline.

[0016] Preferably, a handle is provided on the surface of the baffle plate away from the HVAC body. A fixing groove is opened on the surface of the baffle plate away from the support rod. The cross - section of the fixing groove is in a "C" - shaped structure. A pull rod is provided at the upper end of the support seat. The pull rod is in a "T" - shaped structure. One end of the pull rod is located outside the support seat, and the other end passes through the support seat. A return spring is sleeved on the outer side of the pull rod. One end of the return spring is connected to the support seat, and the other end is connected to the pull rod.

[0017] Preferably, the adjusting mechanism includes an adjusting column, an adjusting movable block, and an adjusting rotating shaft. The adjusting column is fixed at the center of the top surface of the fixed seat. The adjusting movable block is inserted at the top of the adjusting column, and the adjusting rotating shaft is inserted at the top of the adjusting movable block.

[0018] Preferably, a first bevel gear and a second bevel gear are provided inside the adjusting column. The first bevel gear is connected to a rotating wheel, and one end of the rotating wheel is arranged outside the adjusting mechanism. The rotating wheel is horizontally arranged. The second bevel gear is connected to a screw rod. The screw rod is vertically arranged, and the end of the screw rod away from the second bevel gear is threadedly connected to the adjusting movable block.

[0019] Preferably, an adjusting turbine and an adjusting worm are provided inside the upper end of the adjusting movable block. The bottom end of the adjusting rotating shaft is connected to a connecting rod, and the adjusting turbine is sleeved on the surface of the connecting rod. One end of the adjusting worm passes through the adjusting movable block and extends outside the adjusting movable block, and a rotating knob is connected to the end of the adjusting worm extending outside the adjusting movable block.

[0020] Preferably, the limiting and protection mechanism includes a support plate, a soft pad, a protection rotating groove, a protection rotating shaft, and a protection rotating plate. The support plate is fixed at the top of the adjusting rotating shaft and is in a "U" - shaped structure. The soft pad is laid on the lower end of the inner wall of the support plate. The protection rotating groove is opened at the top of the support plate and is in a "C" - shaped structure. The protection rotating plate is arranged at the upper end of the support plate, and one end of the protection rotating plate is hinged to the support plate through the protection rotating shaft.

[0021] Preferably, the upper end of the support plate is provided with an insertion groove, and the insertion groove extends through the support plate. An insertion plate is inserted into the insertion groove, and the insertion groove and the insertion plate cooperate to limit the movement of the protective rotating plate. A limiting support sleeve is fixed on the surface of the protective rotating plate near the soft pad. A limiting support rod is inserted into the lower end of the limiting support sleeve, and a limiting support spring is provided inside the limiting support sleeve. One end of the limiting support spring is connected to the limiting support sleeve, and the other end is connected to the limiting support rod. A limiting support block is connected to the bottom end of the limiting support rod, and the limiting support block has an arc-shaped structure.

[0022] This invention uses bolts and screw holes to fix the mounting base to the ground, positioning the gas pipeline above the limiting and protective mechanism. Rotating the rotating wheel drives the first bevel gear, which in turn drives the second bevel gear and the lead screw. The lead screw, in conjunction with the adjusting block, moves the adjusting block up and down, which in turn moves the adjusting shaft and the limiting and protective mechanism up and down. This allows the limiting and protective mechanism to match and support the gas pipeline. Rotating the adjusting worm gear, in conjunction with the adjusting turbine, drives the adjusting shaft, facilitating rapid adaptation between the limiting and protective mechanism and the gas pipeline, preventing deviations in the support angle, ensuring stable support for the gas pipeline, and improving the pipeline's stability and service life.

[0023] By disengaging the plug plate from the plug slot, the limiting effect on the protective rotating plate is removed. Then, the protective rotating plate is flipped outward, allowing the gas pipeline to enter the support plate. The soft pad inside the support plate protects the gas pipeline and prevents damage. The protective rotating plate is rotated towards the plug slot, and then the plug plate is inserted into the plug plate to limit and fix the protective rotating plate. At this time, the limiting support spring holds the limiting support rod, which drives the limiting support block to always be in contact with the gas pipeline, thereby preventing the gas pipeline from shaking and absorbing the kinetic energy generated by the shaking of the gas pipeline. This limits and protects the gas pipeline, effectively reducing damage to the gas pipeline, and can protect gas pipelines of different diameters.

[0024] When installing the filter plate, simply slide the push plate. The push plate will cause the locking block to slide and compress the limit spring. Then, the filter plate will be attached to the HVAC unit, so that the locking block matches the slot. Then, release the push plate, and the locking block will reset under the action of the limit spring. This makes it easy for the locking block to engage with the slot, which is convenient for fixing the filter plate and for disassembling and cleaning the filter plate. This improves the stability of the HVAC unit during use. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 for Figure 1 An enlarged schematic diagram of the structure at point A;

[0027] Figure 3 This is a three-dimensional structural diagram of the limiting and protective mechanism of the present invention;

[0028] Figure 4 This is a cross-sectional structural schematic diagram of the adjusting mechanism and the limiting protection mechanism of the present invention;

[0029] Figure 5 for Figure 4 An enlarged schematic diagram of the structure at point B;

[0030] Figure 6 This is a schematic diagram of the filter mechanism of the present invention;

[0031] Figure 7 This is a top sectional view of the supporting and protective mechanism of the present invention.

[0032] In the diagram: 1. HVAC body; 2. Adjustment mechanism; 21. Rotary wheel; 22. First bevel gear; 23. Second bevel gear; 24. Lead screw; 25. Adjustment block; 26. Adjustment worm gear; 27. Adjustment turbine; 28. Adjustment shaft; 29. ​​Adjustment column; 3. Filter mechanism; 31. Filter plate; 32. Push plate; 33. Locking block; 34. Limiting spring; 35. Locking groove; 4. Support and protection mechanism; 41. Limiting groove; 42. Baffle; 43. Pull rod; 44. Fixing groove; 45. Return spring; 46. Handle; 47. Support rod; 5. Fixing seat; 6. Screw hole; 7. Support seat; 8. Gas pipeline; 9. Limiting and protection mechanism; 91. Support plate; 92. Soft pad; 93. Protective rotating groove; 94. Protective rotating shaft; 95. Protective rotating plate; 96. Insertion groove; 97. Insertion plate; 98. Limiting and supporting sleeve; 99. Limiting and supporting rod; 910. Limiting and supporting block; 911. Limiting and supporting spring. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1 to 7 The present invention provides a technical solution:

[0035] A heating, ventilation and air conditioning (HVAC) system for public buildings. The HVAC system for public buildings includes: a support base 7, with a support and protection mechanism 4 disposed above it; an HVAC unit 1, arranged above the support and protection mechanism 4, and the HVAC unit 1 is connected to an air delivery pipe 8; a filter mechanism 3, provided on the surface of the HVAC unit 1; a fixing base 5, having screw holes 6 on its surface and fixed by bolts cooperating with the screw holes 6; an adjustment mechanism 2, arranged on the top surface of the fixing base 5; and a limit and protection mechanism 9, disposed above the adjustment mechanism 2 and cooperating with the support and protection mechanism 4 to limit, protect and support the air delivery pipe 8.

[0036] The present invention can be further configured such that the filter mechanism 3 includes a filter plate 31, a push plate 32, a clamping block 33, a limiting spring 34 and a clamping groove 35. The clamping groove 35 is formed on the surface of the HVAC unit 1. Clamping grooves are formed on both side surfaces of the filter plate 31, and the cross-sections of the clamping grooves and the clamping groove 35 are both in a "C" - shaped structure. The limiting spring 34 and the clamping block 33 are both arranged inside the clamping grooves. One end of the limiting spring 34 is connected to the clamping groove, and the other end is connected to the clamping block 33. The limiting spring 34 is always in a compressed state. A push plate 32 is provided on the surface of the filter plate 31 away from the HVAC unit 1. The push plate 32 is in a "T" - shaped structure, passes through the filter plate 31 and is connected to the clamping block 33. Anti - slip bumps are provided on the surface of the push plate 32 away from the filter plate 31.

[0037] The present invention can be further configured such that the support and protection mechanism 4 includes a support rod 47, a baffle 42 and a limiting groove 41. The limiting groove 41 is formed on the surface of the support base 7. The baffle 42 passes through the limiting groove 41 and is inserted into the upper end of the support base 7. The support rod 47 is fixed to the upper end of the support base 7, and the distance between the support rod 47 and the baffle 42 is equal to the diameter of the air delivery pipe 8. A handle 46 is provided on the surface of the baffle 42 away from the HVAC unit 1. A fixing groove 44 is formed on the surface of the baffle 42 away from the support rod 47, and the cross - section of the fixing groove 44 is in a "C" - shaped structure. A pull rod 43 is provided at the upper end of the support base 7. The pull rod 43 is in a "T" - shaped structure. One end of the pull rod 43 is located outside the support base 7, and the other end passes through the support base 7. A return spring 45 is sleeved on the outer side of the pull rod 43. One end of the return spring 45 is connected to the support base 7, and the other end is connected to the pull rod 43.

[0038] The present invention can be further configured such that the adjusting mechanism 2 includes an adjusting column 29, an adjusting movable block 25, and an adjusting rotating shaft 28. The adjusting column 29 is fixed at the center of the top surface of the fixed seat 5. The adjusting movable block 25 is inserted into the top end of the adjusting column 29, and the adjusting rotating shaft 28 is inserted into the top end of the adjusting movable block 25. Inside the adjusting column 29, a first bevel gear 22 and a second bevel gear 23 are provided. The first bevel gear 22 is connected to a rotating wheel 21, and one end of the rotating wheel 21 is arranged outside the adjusting mechanism 2. The rotating wheel 21 is horizontally arranged. The second bevel gear 23 is connected to a screw rod 24, and the screw rod 24 is vertically arranged. The end of the screw rod 24 far from the second bevel gear 23 is threadedly connected to the adjusting movable block 25. Inside the upper end of the adjusting movable block 25, an adjusting turbine 27 and an adjusting worm 26 are provided. The bottom end of the adjusting rotating shaft 28 is connected to a connecting rod, and the adjusting turbine 27 is sleeved on the surface of the connecting rod. One end of the adjusting worm 26 passes through the adjusting movable block 25 and extends outside the adjusting movable block 25, and the end of the adjusting worm 26 extending outside the adjusting movable block 25 is connected to a rotating knob.

[0039] The present invention can be further configured such that the limiting and protecting mechanism 9 includes a support plate 91, a soft pad 92, a protecting rotating groove 93, a protecting rotating shaft 94, and a protecting rotating plate 95. The support plate 91 is fixed at the top end of the adjusting rotating shaft 28 and has a "U" - shaped structure. The soft pad 92 is laid on the lower end of the inner wall of the support plate 91. The protecting rotating groove 93 is opened at the top end of the support plate 91 and has a "匚" - shaped structure. The protecting rotating plate 95 is arranged at the upper end of the support plate 91, and one end of the protecting rotating plate 95 is hinged to the support plate 91 through the protecting rotating shaft 94. An inserting groove 96 is opened at the upper end of the support plate 91 and penetrates through the support plate 91. An inserting plate 97 is inserted into the inserting groove 96. The inserting groove 96 and the inserting plate 97 cooperate to limit the protecting rotating plate 95. On the surface of the protecting rotating plate 95 close to the soft pad 92, a limiting and holding sleeve 98 is fixed. A limiting and holding rod 99 is inserted into the lower end of the limiting and holding sleeve 98. Inside the limiting and holding sleeve 98, a limiting and holding spring 911 is provided. One end of the limiting and holding spring 911 is connected to the limiting and holding sleeve 98, and the other end is connected to the limiting and holding rod 99. The bottom end of the limiting and holding rod 99 is connected to a limiting and holding block 910, and the limiting and holding block 910 has an arc - shaped structure.

[0040] First, place the HVAC body 1 above the support rod 47. At the same time, the air - conveying pipeline 8 at the bottom of the HVAC body 1 is located between the support rod 47 and the limiting groove 41. By pulling the pull rod 43 and compressing the return spring 45, then pass the baffle 42 through the two limiting grooves 41 through the handle 46. Release the pull rod 43, and the return spring 45 will push the pull rod 43 into the fixing groove 44, thereby limiting and fixing the baffle 42, making the air - conveying pipeline 8 located between the support rod 47 and the baffle 42, avoiding the sliding of the air - conveying pipeline 8, and restricting the air - conveying pipeline 8.

[0041] By using bolts and screw holes 6 to fix the fixing base 5 to the ground, the gas pipeline 8 is positioned above the limiting protection mechanism 9. By rotating the rotating wheel 21, the rotation of the rotating wheel 21 drives the first bevel gear 22 to rotate, which in turn drives the second bevel gear 23 and the lead screw 24 to rotate. Thus, the lead screw 24 cooperates with the adjusting movable block 25 to move the adjusting movable block 25 up and down, which in turn drives the adjusting shaft 28 and the limiting protection mechanism 9 to move up and down. This allows the limiting protection mechanism 9 to match and support the gas pipeline 8. By rotating the adjusting worm gear 26, the adjusting worm gear 26 cooperates with the adjusting turbine 27 to drive the adjusting shaft 28 to rotate, which facilitates the quick adaptation of the limiting protection mechanism 9 and the gas pipeline 8, avoids deviations in the support angle, facilitates stable support for the gas pipeline 8, and improves the stability and service life of the gas pipeline 8.

[0042] By disengaging the plug plate 97 from the plug slot 96, the limiting effect on the protective rotating plate 95 is removed. Then, the protective rotating plate 95 is flipped outward, allowing the gas pipeline 8 to enter the support plate 91. The soft pad 92 inside the support plate 91 protects the gas pipeline 8, preventing damage. The protective rotating plate 95 is rotated toward the plug slot 96, and then the plug plate 97 is inserted into the plug plate 97 to limit and fix the protective rotating plate 95. At this time, the limiting support spring 911 supports the limiting support rod 99, causing the limiting support block 910 to always be in contact with the gas pipeline 8, thereby preventing the gas pipeline 8 from shaking and absorbing the kinetic energy generated by the shaking of the gas pipeline 8. This limits and protects the gas pipeline 8, effectively reducing damage to the gas pipeline 8, and can protect gas pipelines 8 of different diameters.

[0043] When installing the filter plate 31, simply slide the push plate 32. The push plate 32 drives the locking block 33 to slide and compress the limiting spring 34. Then, the filter plate 31 is attached to the HVAC body 1, so that the locking block 33 matches the locking groove 35. Then, the push plate 32 is released, and the locking block 33 is reset under the action of the limiting spring 34, which facilitates the locking block 33 to engage with the locking groove 35, making it easy to fix the filter plate 31 and to disassemble and clean the filter plate 31, thus improving the stability of the HVAC body 1 in use.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heating, ventilation, and air conditioning system for public buildings, characterized in that: The HVAC system for public buildings includes: A support base (7) with a support and protection mechanism (4) disposed above it; An HVAC unit (1) disposed above the support and protection mechanism (4), and the HVAC unit (1) is connected to an air输送 pipeline (8); A filter mechanism (3) disposed on the surface of the HVAC unit (1); A fixing seat (5) with screw holes (6) formed on its surface, and is fixed by bolts cooperating with the screw holes (6); An adjusting mechanism (2) disposed on the top surface of the fixing seat (5); and A limiting and protection mechanism (9) disposed above the adjusting mechanism (2), and cooperating with the support and protection mechanism (4) to limit, protect and support the air输送 pipeline (8); The support and protection mechanism (4) includes a support rod (47), a baffle (42) and a limiting groove (41). The limiting groove (41) is formed on the surface of the support base (7), and the baffle (42) passes through the limiting groove (41) and is inserted into the upper end of the support base (7). The support rod (47) is fixed to the upper end of the support base (7), and the distance between the support rod (47) and the baffle (42) is equal to the diameter of the air输送 pipeline (8). The air输送 pipeline (8) is located between the support rod (47) and the baffle (42).

2. The heating, ventilation, and air conditioning system for public buildings according to claim 1, characterized in that: The filter mechanism (3) includes a filter plate (31), a push plate (32), a clamping block (33), a limiting spring (34) and a clamping groove (35). The clamping groove (35) is formed on the surface of the HVAC unit (1). Clamping grooves are formed on both side surfaces of the filter plate (31), and the cross-sections of the clamping grooves and the clamping groove (35) are both in a "匚" - shaped structure. The limiting spring (34) and the clamping block (33) are both disposed inside the clamping groove.

3. A heating, ventilation, and air conditioning system for public buildings according to claim 2, characterized in that: One end of the limiting spring (34) is connected to the clamping groove, and the other end is connected to the clamping block (33). The limiting spring (34) is always in a compressed state. A push plate (32) is disposed on the surface of the filter plate (31) away from the HVAC unit (1). The push plate (32) is in a "T" - shaped structure, and the push plate (32) passes through the filter plate (31) and is connected to the clamping block (33). Anti - slip bumps are disposed on the surface of the push plate (32) away from the filter plate (31).

4. A heating, ventilation, and air conditioning system for public buildings according to claim 1, characterized in that: A handle (46) is disposed on the surface of the baffle (42) away from the HVAC unit (1). A fixing groove (44) is formed on the surface of the baffle (42) away from the support rod (47). The cross - section of the fixing groove (44) is in a "匚" - shaped structure. A pull rod (43) is disposed at the upper end of the support base (7). The pull rod (43) is in a "土" - shaped structure. One end of the pull rod (43) is located outside the support base (7), and the other end passes through the support base (7). A return spring (45) is sleeved on the outside of the pull rod (43). One end of the return spring (45) is connected to the support base (7), and the other end is connected to the pull rod (43).

5. A heating, ventilation, and air conditioning system for public buildings according to claim 1, characterized in that: The adjusting mechanism (2) includes an adjusting column (29), an adjusting movable block (25) and an adjusting rotating shaft (28). The adjusting column (29) is fixed at the center of the top surface of the fixing seat (5). The adjusting movable block (25) is inserted into the top end of the adjusting column (29). The adjusting rotating shaft (28) is inserted into the top end of the adjusting movable block (25).

6. A heating, ventilation, and air conditioning system for public buildings according to claim 5, characterized in that: Inside the adjusting column (29), a first bevel gear (22) and a second bevel gear (23) are provided. The first bevel gear (22) is connected to a runner (21), and one end of the runner (21) is arranged outside the adjusting mechanism (2). The runner (21) is horizontally arranged. The second bevel gear (23) is connected to a screw rod (24), and the screw rod (24) is vertically arranged. The end of the screw rod (24) away from the second bevel gear (23) is threadedly connected to an adjusting movable block (25).

7. A heating, ventilation, and air conditioning system for public buildings according to claim 6, characterized in that: Inside the upper end of the adjusting movable block (25), an adjusting turbine (27) and an adjusting worm (26) are provided. The bottom end of an adjusting rotating shaft (28) is connected to a connecting rod, and the adjusting turbine (27) is sleeved on the surface of the connecting rod. One end of the adjusting worm (26) passes through the adjusting movable block (25) and extends outside the adjusting movable block (25), and the end of the adjusting worm (26) extending outside the adjusting movable block (25) is connected to a rotating knob.

8. A heating, ventilation, and air conditioning system for public buildings according to claim 7, characterized in that: The limiting and protecting mechanism (9) includes a support plate (91), a soft pad (92), a protecting rotating groove (93), a protecting rotating shaft (94) and a protecting rotating plate (95). The support plate (91) is fixed to the top end of the adjusting rotating shaft (28) and is in a "U" - shaped structure. The soft pad (92) is laid on the lower end of the inner wall of the support plate (91). The protecting rotating groove (93) is opened at the top end of the support plate (91) and is in a "匚" - shaped structure. The protecting rotating plate (95) is arranged at the upper end of the support plate (91), and one end of the protecting rotating plate (95) is hinged to the support plate (91) through the protecting rotating shaft (94).

9. A heating, ventilation, and air conditioning system for public buildings according to claim 8, characterized in that: An inserting groove (96) is opened at the upper end of the support plate (91), and the inserting groove (96) runs through the support plate (91). An inserting plate (97) is inserted into the inserting groove (96). The inserting groove (96) and the inserting plate (97) cooperate to limit the protecting rotating plate (95). A limiting and holding sleeve (98) is fixed on the surface of the protecting rotating plate (95) close to the soft pad (92). A limiting and holding rod (99) is inserted into the lower end of the limiting and holding sleeve (98). A limiting and holding spring (911) is arranged inside the limiting and holding sleeve (98). One end of the limiting and holding spring (911) is connected to the limiting and holding sleeve (98), and the other end is connected to the limiting and holding rod (99). The bottom end of the limiting and holding rod (99) is connected to a limiting and holding block (910), and the limiting and holding block (910) is in an arc - shaped structure.

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