A foundation pit protection enclosure for road construction

Abstract

The present invention relates to the field of enclosure technology, and specifically to a foundation pit protective enclosure for road construction. A foundation pit protective enclosure for road construction includes a base, a baffle and two adjustment mechanisms, each adjustment mechanism including a telescopic rod, a first adjustment assembly and a second adjustment assembly. The impact force of the wind is dispersed by the inclined baffle to reduce the impact on the baffle. The setting of the adjustment mechanism can generate a certain buffer in the process of wind hitting the baffle, thereby extending the service life of the baffle. At the same time, the inclined baffle adds more working area to the outside of the foundation pit, which is convenient for construction. The present invention provides a foundation pit protective enclosure for road construction to solve the problem that the existing enclosure is easily damaged when in contact with the wind.

Description

Technical Field

[0001] The present invention relates to the technical field of enclosures, and in particular to a foundation pit protective enclosure for road construction. Background Art

[0002] In road construction, foundation pit protection enclosures are key facilities to ensure construction safety and prevent personnel from falling or earth collapse. The core function of foundation pit protection enclosures is to prevent pedestrians and vehicles from mistakenly entering the foundation pit area and avoid falling or landslide accidents. Clearly divide the construction scope to reduce the impact of dust and noise on the surrounding environment. Use reflective signs or lights to remind night traffic safety, and some enclosure structures can assist in supporting the pit wall and reduce soil erosion. Common types of foundation pit protection enclosures include rigid enclosures, flexible enclosures, combined enclosures, and intelligent enclosures.

[0003] At present, foundation pit protection enclosures are generally divided into two types. One is open type, which can effectively resist wind damage but has almost no dust prevention effect. The other is closed type. Although this type can effectively prevent dust, it has no resistance to strong winds. At the same time, because the enclosure is vertically and firmly installed on the ground, there is no cushioning effect when people hit it, which will cause great damage to people's health.

[0004] For example, the utility model patent with announcement number CN214883717U provides a foundation pit protection device, which can make the angle between two adjacent protection device bodies adjustable, and thus can achieve the function of enclosure for different types of foundation pits. However, when encountering strong winds, the enclosure is directly in contact with the wind, and the impact of the wind can easily cause damage to the enclosure. Summary of the invention

[0005] The invention provides a foundation pit protective enclosure for road construction, so as to solve the problem that the existing enclosure is easily damaged when contacted with wind.

[0006] The present invention provides a road construction pit protection enclosure, which adopts the following technical scheme: a road construction pit protection enclosure, comprising a base, a baffle and two adjustment mechanisms, wherein the base is arranged on the ground, and the pit comprises a base and a base wall. The baffle is arranged obliquely, and the lower side of the baffle is rotatably arranged on the base, and the baffle gradually moves away from the pit along the direction from top to bottom.

[0007] The two adjustment mechanisms are sequentially distributed along a first direction, which is a horizontal direction and parallel to the baffle. Each adjustment mechanism includes a telescopic rod, a first adjustment component and a second adjustment component. The telescopic rod can be telescopic, the lower end of the telescopic rod is rotatably arranged in the foundation pit, and the upper end of the telescopic rod is rotatably connected to the upper side of the baffle.

[0008] The telescopic rod has a first position, a second position and a third position. The first position of the telescopic rod is a vertical setting of the telescopic rod, and the telescopic rod is inclined when it is in the second position and the third position, and the angle between the telescopic rod and the base wall when the telescopic rod is in the second position is smaller than the angle between the telescopic rod and the base wall when the telescopic rod is in the third position. Manually straighten the telescopic rod to the first position, and after releasing the hand, the first adjustment component drives the telescopic rod to rotate from the first position to the second position. The wind blows the baffle, and the baffle drives the telescopic rod to rotate from the second position to the third position. When there is no wind, under the action of the second adjustment component, the telescopic rod rotates from the third position to the second position.

[0009] Further, the telescopic rod includes a first connecting tube, a connecting rod, and a second connecting tube. The first connecting tube, the second connecting tube, and the connecting rod are coaxially arranged. The upper end of the first connecting tube is rotatably connected to the upper side of the baffle, the upper end of the connecting rod is slidably arranged in the first connecting tube, and the lower end of the connecting rod is slidably arranged in the second connecting tube. The first adjustment component includes a tension spring, and the tension spring has a first state and a second state. The first state of the tension spring is that the tension spring is connected to the first connecting tube and the second connecting tube. The second state of the tension spring is that the tension spring and the second connecting tube are disconnected.

[0010] Furthermore, a first limiting ring is fixedly provided on the outer peripheral wall of the first connecting tube, and the first limiting ring and the first connecting tube are coaxially provided. A second limiting ring is fixedly provided on the upper end of the tension spring, and the second limiting ring and the first connecting tube are coaxially provided, and the second limiting ring is detachably provided on the outer side of the first connecting tube. Each adjustment mechanism also includes a buckle, which is detachably provided on the outer peripheral wall of the first connecting tube, and the second limiting ring is located on the upper side of the buckle, and the first limiting ring is located on the lower side of the buckle.

[0011] Furthermore, the second adjustment assembly includes a compression spring, which connects the first connecting tube and the connecting rod.

[0012] Furthermore, each adjustment mechanism also includes a plum blossom knob, which is rotatably arranged on the second connecting tube. A connecting shaft is fixedly arranged on the plum blossom knob, and the connecting shaft is used to abut against the connecting rod.

[0013] Furthermore, a foundation pit protective enclosure for road construction also includes a locking mechanism, which includes a limit plate, which is fixed on the base and is used to abut against the first connecting pipe.

[0014] Furthermore, each adjustment mechanism also includes an anchor rod, which is vertically arranged and fixedly arranged on the base. The lower end of each second connecting pipe is rotatably arranged on an anchor rod.

[0015] Furthermore, a water pipe is fixedly arranged on the upper side of the baffle, the water pipe is arranged along the first direction, a plurality of nozzles are arranged on the water pipe, and the plurality of nozzles are distributed in sequence along the first direction.

[0016] Furthermore, the base includes two fixed blocks and tie rods, the fixed blocks are fixedly set on the ground, the lower end of each fixed rod is rotatably set on a fixed block, the tie rods are set along the first direction, and the two ends of the tie rods are fixedly connected to the two fixed blocks respectively.

[0017] Furthermore, a first retaining ring is fixedly provided at the lower end of the first connecting tube, the first retaining ring is inside the first connecting tube, and the first retaining ring and the first connecting tube are coaxially arranged. A second retaining ring is fixedly provided at the upper end of the connecting rod, the second retaining ring and the connecting rod are coaxially arranged, the second retaining ring is slidably arranged in the first connecting tube, and the second retaining ring is used to abut against the first retaining ring.

[0018] The beneficial effects of the present invention are as follows: a foundation pit protective enclosure for road construction of the present invention disperses the impact force of the wind through the inclined baffles to reduce the impact on the baffles. Through the provided adjustment mechanism, when the wind blows the baffle, the baffle rotates, and the upper side of the baffle deflects in the direction close to the foundation pit. The baffle drives the telescopic rod to rotate, and the telescopic rod rotates in the direction away from the foundation wall, and the telescopic rod rotates from the second position to the third position. When there is no wind, under the action of the second adjustment component, the telescopic rod rotates from the third position to the second position. Thereby, a certain buffer is generated in the process of wind hitting the baffle, thereby extending the service life of the baffle. At the same time, the inclined baffle adds more working area to the outside of the foundation pit, which is convenient for construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the structure of a foundation pit protection enclosure for road construction provided by an embodiment of the present invention;

[0021] Figure 2 A front view of a foundation pit protection enclosure for road construction provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of an adjustment mechanism for a foundation pit protection enclosure for road construction provided by an embodiment of the present invention;

[0023] Figure 4 A front view of an adjustment mechanism of a foundation pit protection enclosure for road construction provided by an embodiment of the present invention;

[0024] Figure 5 for Figure 4Sectional view along AA direction;

[0025] Figure 6 A partial structural schematic diagram of an adjustment mechanism of a foundation pit protection enclosure for road construction provided by an embodiment of the present invention;

[0026] Figure 7 for Figure 6 Cross-sectional view along the BB direction;

[0027] Figure 8 for Figure 1 Enlarged view of point C in the middle;

[0028] Fig. 9 A schematic structural diagram of a telescopic rod of a foundation pit protective enclosure for road construction provided by an embodiment of the present invention being in a second position.

[0029] In the figure: 100, foundation pit; 101, base; 102, base wall; 110, ground; 200, base; 210, fixed block; 220, tension rod; 300, baffle; 310, water pipe; 320, nozzle; 400, telescopic rod; 410, first connecting pipe; 411, first limiting ring; 420, connecting rod; 430, second connecting pipe; 440, plum blossom knob; 441, connecting shaft; 450, anchor rod; 500, tension spring; 501, second limiting ring; 510, buckle; 600, compression spring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Reference Figures 1 to 9 As shown, an embodiment of the present invention provides a foundation pit protection enclosure for road construction, including a base 200, a baffle 300 and two adjustment mechanisms, wherein the base 200 is arranged on the ground 110, and the foundation pit 100 includes a base 101 and a base wall 102. The baffle 300 is arranged obliquely, and the lower side of the baffle 300 is rotatably arranged on the base 200, and along the direction from top to bottom, the baffle 300 gradually moves away from the foundation pit 100.

[0032] The two adjustment mechanisms are sequentially distributed along a first direction, which is a horizontal direction and parallel to the baffle 300. Each adjustment mechanism includes a telescopic rod 400, a first adjustment component and a second adjustment component. The telescopic rod 400 can be telescopic, the lower end of the telescopic rod 400 is rotatably arranged in the foundation pit 100, and the upper end of the telescopic rod 400 is rotatably connected to the upper side of the baffle 300.

[0033] The telescopic rod 400 has a first position, a second position and a third position. The first position of the telescopic rod 400 is that the telescopic rod 400 is vertically set, and the telescopic rod 400 is inclined when it is in the second position and the third position, and the angle between the telescopic rod 400 and the base wall 102 when the telescopic rod 400 is in the second position is smaller than the angle between the telescopic rod 400 and the base wall 102 when the telescopic rod 400 is in the third position. Manually straighten the telescopic rod 400 to the first position, and after letting go, the first adjustment component drives the telescopic rod 400 to rotate from the first position to the second position. The wind blows the baffle 300, and the baffle 300 drives the telescopic rod 400 to rotate from the second position to the third position. When there is no wind, under the action of the second adjustment component, the telescopic rod 400 rotates from the third position to the second position.

[0034] The base 200 is fixedly set on the ground 110, and the telescopic rod 400 is installed in the foundation pit 100. The telescopic rod 400 is manually adjusted to the first position, and after the hand is released, the first adjustment component drives the telescopic rod 400 to rotate from the first position to the second position. At this time, the baffle 300 and the telescopic rod 400 are both inclined. When the wind blows from the outside of the foundation pit 100 to the inside of the foundation pit 100, the inclined baffle 300 disperses the impact force of the wind to reduce the impact on the baffle 300.

[0035] When the wind blows the baffle 300, the baffle 300 rotates, and the upper side of the baffle 300 deflects toward the direction close to the foundation pit 100. The baffle 300 drives the telescopic rod 400 to rotate, and the telescopic rod 400 rotates in the direction away from the base wall 102, and the telescopic rod 400 rotates from the second position to the third position. When there is no wind, under the action of the second adjustment component, the telescopic rod 400 rotates from the third position to the second position. Thereby, a certain buffer is generated in the process of wind hitting the baffle 300, and the service life of the baffle 300 is extended.

[0036] In this embodiment, the telescopic rod 400 includes a first connecting tube 410, a connecting rod 420, and a second connecting tube 430. The first connecting tube 410, the second connecting tube 430, and the connecting rod 420 are coaxially arranged. The upper end of the first connecting tube 410 is rotatably connected to the upper side of the baffle 300, the upper end of the connecting rod 420 is slidably arranged in the first connecting tube 410, and the lower end of the connecting rod 420 is slidably arranged in the second connecting tube 430. The first adjustment component includes a tension spring 500, and the tension spring 500 has a first state and a second state. The first state of the tension spring 500 is that the tension spring 500 is connected to the first connecting tube 410 and the second connecting tube 430. The second state of the tension spring 500 is that the tension spring 500 and the second connecting tube 430 are disconnected.

[0037] In the initial state, the tension spring 500 is in the first state. When the telescopic rod 400 is straightened, the telescopic rod 400 gradually extends and the tension spring 500 is gradually stretched. After the telescopic rod 400 is vertical, the telescopic rod 400 is released, and the telescopic rod 400 is shortened under the action of the tension spring 500. Since the upper end of the telescopic rod 400 is rotatably connected to the baffle 300, the telescopic rod 400 is tilted when shortened, and the upper end of the telescopic rod 400 gradually moves away from the base wall 102, and the telescopic rod 400 rotates from the first position to the second position.

[0038] In this embodiment, a first limiting ring 411 is fixedly provided on the outer peripheral wall of the first connecting tube 410, and the first limiting ring 411 and the first connecting tube 410 are coaxially arranged. A second limiting ring 501 is fixedly provided on the upper end of the tension spring 500, and the second limiting ring 501 and the first connecting tube 410 are coaxially arranged, and the second limiting ring 501 is detachably arranged on the outer side of the first connecting tube 410. Each adjustment mechanism also includes a buckle 510, which is detachably arranged on the outer peripheral wall of the first connecting tube 410, and the second limiting ring 501 is located on the upper side of the buckle 510, and the first limiting ring 411 is located on the lower side of the buckle 510.

[0039] In this embodiment, the second adjustment assembly includes a compression spring 600, which connects the first connecting tube 410 and the connecting rod 420. In the initial state, the tension spring 500 is in the first state, and the tension spring 500 connects the first connecting tube 410 and the second connecting tube 430. Under the action of the tension spring 500, the tension spring 500 applies a downward force to the first connecting tube 410, so that the compression spring 600 is in a compressed state.

[0040] In this embodiment, each adjustment mechanism further includes a plum blossom knob 440, which is rotatably disposed on the second connecting tube 430. A connecting shaft 441 is fixedly disposed on the plum blossom knob 440, and the connecting shaft 441 is used to abut against the connecting rod 420. After the connecting shaft 441 and the connecting rod 420 abut against each other, the second connecting tube 430 and the connecting rod 420 no longer move relative to each other.

[0041] In this embodiment, a foundation pit protection enclosure for road construction further includes a locking mechanism, which includes a limit plate, which is fixedly arranged on the base 200, and the limit plate is used to abut against the first connecting pipe 410. After the telescopic rod 400 is in the second position, the limit plate is fixedly arranged on the base 200, so that the telescopic rod 400 maintains the second position, preventing the telescopic rod 400 from deflecting in the direction close to the first position.

[0042] In this embodiment, each adjustment mechanism further includes an anchor rod 450, which is vertically disposed and fixedly disposed on the base 101. The lower end of each second connecting tube 430 is rotatably disposed on an anchor rod 450.

[0043] In this embodiment, a water pipe 310 is fixedly disposed on the upper side of the baffle 300, the water pipe 310 is disposed along the first direction, a plurality of nozzles 320 are disposed on the water pipe 310, and the plurality of nozzles 320 are sequentially distributed along the first direction. The water mist sprayed by the nozzle 320 is used for dust reduction.

[0044] In this embodiment, the base 200 includes two fixed blocks 210 and tie rods 220. The fixed blocks 210 are fixedly set on the ground 110. The lower end of each fixed rod is rotatably set on a fixed block 210. The tie rods 220 are set along the first direction, and the two ends of the tie rods 220 are fixedly connected to the two fixed blocks 210 respectively.

[0045] In this embodiment, a first retaining ring is fixedly provided at the lower end of the first connecting tube 410, the first retaining ring is inside the first connecting tube 410, and the first retaining ring and the first connecting tube 410 are coaxially arranged. A second retaining ring is fixedly provided at the upper end of the connecting rod 420, the second retaining ring and the connecting rod 420 are coaxially arranged, the second retaining ring is slidably arranged in the first connecting tube 410, and the second retaining ring is used to abut against the first retaining ring.

[0046] Working process: The base 200 is fixedly set on the ground 110. The anchor rod 450 is vertically set and fixedly set in the base 101. In the initial state, the connecting rod 420 can slide relative to the second connecting tube 430. The tension spring 500 is in the first state, and the tension spring 500 connects the first connecting tube 410 and the second connecting tube 430. Under the action of the tension spring 500, the tension spring 500 gives the first connecting tube 410 a downward force, so that the compression spring 600 is in a compressed state.

[0047] Afterwards, hold the first connecting tube 410 by hand and manually straighten the telescopic rod 400. Under the action of the baffle 300, the telescopic rod 400 gradually becomes vertical while the telescopic rod 400 gradually extends. At this time, the first connecting tube 410 moves upward, and the tension spring 500 is stretched. The first connecting tube 410 drives the connecting rod 420 to move upward synchronously through the compression spring 600, and the connecting rod 420 moves upward relative to the second connecting tube 430. According to the depth of the foundation pit 100, the distance that the connecting rod 420 moves upward relative to the second connecting tube 430 is adjusted. When the first connecting tube 410 moves upward, it drives the upper end of the baffle 300 to move upward, and drives the baffle 300 to deflect until the first connecting tube 410 is completely vertical, at which time the telescopic rod 400 is in the first position.

[0048] Then, the plum blossom knob 440 is rotated so that the plum blossom knob 440 contacts the connecting rod 420, so that the connecting rod 420 no longer rotates relative to the second connecting tube 430. After that, the operator releases the first connecting tube 410, and the tension spring 500 pulls the first connecting tube 410 downward, so that the first connecting tube 410 moves downward relative to the connecting rod 420, thereby further compressing the compression spring 600.

[0049] When the first connecting tube 410 moves downward, the baffle 300 continues to tilt, the telescopic rod 400 shortens and tilts, and the telescopic rod 400 gradually moves away from the base wall 102. At this time, the telescopic rod 400 is in the second position. Afterwards, the limit plate is fixed on the base 200, so that the telescopic rod 400 maintains the second position and prevents the telescopic rod 400 from deflecting in the direction close to the first position.

[0050] Finally, the buckle 510 is removed, and the tension spring 500 is separated from the first connecting tube 410. After the tension spring 500 is separated from the first connecting tube 410, since the connecting rod 420 cannot move, and there is no tension spring 500 to generate a downward force on the first connecting tube 410, the compression spring 600 has a force to move the first connecting tube 410 upward relative to the connecting rod 420. However, due to the presence of the limit plate, the first connecting tube 410 cannot move upward any further, so the telescopic rod 400 remains in the second position.

[0051] When the wind blows from the outside of the foundation pit 100 to the inside of the foundation pit 100, the inclined baffle 300 disperses the impact force of the wind to reduce the impact on the baffle 300. And when the wind blows the baffle 300, the baffle 300 rotates, and the upper side of the baffle 300 deflects in the direction close to the foundation pit 100. The baffle 300 drives the telescopic rod 400 to rotate, and the telescopic rod 400 rotates in the direction away from the base wall 102, and the telescopic rod 400 rotates from the second position to the third position. The compression spring 600 is further compressed, and when there is no wind, the compression spring 600 is reset, driving the telescopic rod 400 to move in the direction close to the base wall 102, and the telescopic rod 400 rotates from the third position to the second position. Thereby, a certain buffer is generated in the process of wind hitting the baffle 300, extending the service life of the baffle 300. At the same time, the inclined baffle 300 adds more working areas to the outside of the foundation pit 100, which is convenient for construction.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A foundation pit protection enclosure for road construction, characterized in that: The utility model comprises a base, a baffle and two adjustment mechanisms, wherein the base is arranged on the ground, and the foundation pit comprises a base and a foundation wall; the baffle is arranged obliquely, and the lower side of the baffle is rotatably arranged on the base, and the baffle gradually moves away from the foundation pit along the direction from top to bottom; The two adjustment mechanisms are sequentially distributed along a first direction, which is a horizontal direction and parallel to the baffle; each adjustment mechanism includes a telescopic rod, a first adjustment component and a second adjustment component; the telescopic rod can be telescoped, the lower end of the telescopic rod is rotatably arranged in the foundation pit, and the upper end of the telescopic rod is rotatably connected to the upper side of the baffle; The telescopic rod has a first position, a second position and a third position; the first position of the telescopic rod is a vertical setting of the telescopic rod, the telescopic rod is inclined when it is in the second position and the third position, and the angle between the telescopic rod and the base wall when the telescopic rod is in the second position is smaller than the angle between the telescopic rod and the base wall when the telescopic rod is in the third position; the telescopic rod is manually straightened to the first position, and after releasing the hand, the first adjustment component drives the telescopic rod to rotate from the first position to the second position; the wind blows the baffle, and the baffle drives the telescopic rod to rotate from the second position to the third position; when there is no wind, under the action of the second adjustment component, the telescopic rod rotates from the third position to the second position.

2. A foundation pit protection enclosure for road construction according to claim 1, characterized in that: The telescopic rod includes a first connecting tube, a connecting rod and a second connecting tube; the first connecting tube, the second connecting tube and the connecting rod are coaxially arranged; the upper end of the first connecting tube is rotatably connected to the upper side of the baffle, the upper end of the connecting rod is slidably arranged in the first connecting tube, and the lower end of the connecting rod is slidably arranged in the second connecting tube; the first adjustment component includes a tension spring, the tension spring has a first state and a second state, the first state of the tension spring is that the tension spring is connected to the first connecting tube and the second connecting tube; the second state of the tension spring is that the tension spring and the second connecting tube are disconnected.

3. A foundation pit protection enclosure for road construction according to claim 2, characterized in that: A first limiting ring is fixedly arranged on the outer peripheral wall of the first connecting tube, and the first limiting ring and the first connecting tube are coaxially arranged; a second limiting ring is fixedly arranged on the upper end of the tension spring, and the second limiting ring and the first connecting tube are coaxially arranged, and the second limiting ring is detachably arranged on the outside of the first connecting tube; each adjustment mechanism also includes a buckle, which is detachably arranged on the outer peripheral wall of the first connecting tube, and the second limiting ring is on the upper side of the buckle, and the first limiting ring is on the lower side of the buckle.

4. A foundation pit protection enclosure for road construction according to claim 2, characterized in that: The second adjusting assembly includes a compression spring, which connects the first connecting pipe and the connecting rod.

5. The foundation pit protection enclosure for road construction according to claim 2 is characterized in that: Each adjustment mechanism also includes a plum blossom knob, which is rotatably arranged on the second connecting tube; a connecting shaft is fixedly arranged on the plum blossom knob, and the connecting shaft is used to abut against the connecting rod.

6. A foundation pit protection enclosure for road construction according to claim 2, characterized in that: It also includes a locking mechanism, which includes a limiting plate, which is fixed on the base and is used to abut against the first connecting pipe.

7. The road construction foundation pit protection enclosure according to claim 2 is characterized by: Each adjusting mechanism also includes an anchor rod, which is vertically arranged and fixedly arranged on the base; the lower end of each second connecting pipe is rotatably arranged on an anchor rod.

8. The foundation pit protection enclosure for road construction according to claim 1 is characterized by: A water pipe is fixedly arranged on the upper side of the baffle, the water pipe is arranged along the first direction, a plurality of nozzles are arranged on the water pipe, and the plurality of nozzles are distributed in sequence along the first direction.

9. The road construction foundation pit protection enclosure according to claim 1, characterized in that: The base includes two fixed blocks and tie bars, the fixed blocks are fixedly arranged on the ground, the lower end of each fixed rod is rotatably arranged on a fixed block, the tie bars are arranged along a first direction, and the two ends of the tie bars are fixedly connected to the two fixed blocks respectively.

10. The foundation pit protection enclosure for road construction according to claim 2, characterized in that: A first baffle ring is fixedly provided at the lower end of the first connecting tube, the first baffle ring is inside the first connecting tube, and the first baffle ring and the first connecting tube are coaxially arranged; a second baffle ring is fixedly provided at the upper end of the connecting rod, the second baffle ring and the connecting rod are coaxially arranged, the second baffle ring is slidably arranged in the first connecting tube, and the second baffle ring is used to resist the first baffle ring.

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