Foundation leveling equipment for constructional engineering

Abstract

The invention discloses foundation leveling equipment for constructional engineering, and belongs to the technical field of foundation leveling, the foundation leveling equipment comprises a base mechanism used for moving and watering, and the base mechanism is provided with a flattening mechanism used for leveling a foundation and a soil pressing mechanism used for primarily pressing soil; the water spraying module can clean the walking crawler belt when leveling operation is conducted on a foundation, meanwhile, the wet walking crawler belt can wet foundation soil, and pressing is convenient; according to the flattening mechanism, a plurality of groups of springs are matched with a poking wheel and a guide column, so that a pressing plate achieves high-frequency striking on a foundation, and efficient foundation flattening operation is achieved; when the pressing plate is used for flattening a foundation, the pressing arm can be driven to be lifted, so that the foundation at the front end of equipment is pre-pressed through the counterweight pressing block, the foundation can be conveniently flattened when the pressing plate reaches the pre-pressing position, and the flattening effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation leveling, and particularly to a foundation leveling device for construction projects. Background Art

[0002] In construction projects, foundation leveling is a basic task to ensure the stability of building structures. Foundation leveling equipment is used to remove, compact, and level the land surface to provide stable and uniform support for the foundation of buildings. Bulldozers are the most common equipment used for foundation leveling. It levels or removes soil through a large blade at the front. Bulldozers are usually used to clear large areas of land and adjust the terrain to make it flat, but they cannot achieve large-scale foundation leveling, and at the same time, the leveling effect is poor; the existing foundation leveling equipment usually has a poor leveling effect and cannot achieve full-automatic operation, making it inconvenient to use. Summary of the Invention

[0003] In view of the above technical problems, the technical solution adopted by the present invention is: a foundation leveling device for construction projects, including a base mechanism for moving and sprinkling water. The base mechanism includes a frame body, and a sprinkling module is arranged on the frame body. A flattening mechanism for leveling the foundation and a soil pressing mechanism for initially pressing the soil are arranged on the base mechanism. The flattening mechanism includes a ground pressing box, and the soil pressing mechanism includes an adjusting arm, and a ratchet gear is rotatably installed on the adjusting arm. The flattening mechanism includes a lifting rod and a central column slidably installed on the ground pressing box. A pressing plate is fixedly installed on the central column, a lifting block is fixedly installed on the central column, a guide column is fixedly installed on the lifting block, the guide column slides on the ground pressing box, and a dial is rotatably installed on the ground pressing box, and the dial is in contact with the guide column.

[0004] Further, the base mechanism includes traveling wheels rotatably installed on the frame body, traveling tracks are wound outside the traveling wheels, and a motor for driving the traveling wheels is arranged inside the frame body.

[0005] Further, the sprinkling module includes a piston cylinder fixedly installed on the ground pressing box, a water tank is fixedly installed on the frame body, the water tank is communicated with the piston cylinder through a push pipe, two spray pipes are fixedly installed on the water tank, a plurality of nozzles are arranged on the spray pipes, the lifting rod is slidably installed with the piston cylinder, a piston piece is fixedly installed on the piston cylinder, the piston piece slides along the inner wall of the piston cylinder, and a one-way rotating piece is rotatably installed on the piston cylinder, and the one-way rotating piece can only rotate inward.

[0006] The traveling wheels are driven to rotate by two motors inside the frame body, thereby driving the traveling tracks to rotate, so that the whole device moves and turns.

[0007] When the lifting rod rises, it drives the piston piece to slide upward along the piston cylinder. At this time, the one-way rotating piece is closed, and the gas above the piston piece is pushed into the water tank through the ejection pipe, and the water in the water tank is sprayed out from the nozzle of the spray pipe to clean the traveling track. At the same time, the wet traveling track can wet the foundation soil, which is convenient for pressing. When the lifting rod descends, the piston piece slides downward along the piston cylinder, and the one-way rotating piece rotates inward due to negative pressure, and the outside gas enters the piston cylinder. This reciprocates to continuously spray the water in the water tank from the nozzle of the spray pipe.

[0008] Further, the flattening mechanism further includes a flattening motor fixedly installed on the ground pressing box. The flattening motor drives the dial to rotate through a transmission belt. The pressing plate is fixedly installed with the lifting rod. A tension spring is arranged between the lifting block and the ground pressing box. A rack frame is fixedly installed on the lifting rod. A ratchet rack is slidably installed on the rack frame. A spring is arranged between the ratchet rack and the rack frame. The ratchet rack meshes with the ratchet gear.

[0009] Further, two outer rotating blocks are rotatably installed in the ground pressing box. A sliding sleeve is fixedly installed on the outer rotating block. A sliding rod is slidably installed in the sliding sleeve. An inner rotating block is fixedly installed on the sliding rod. The inner rotating block is rotatably installed with the lifting block. A spring is arranged between the sliding rod and the sliding sleeve.

[0010] The flattening motor drives the dial to rotate through the transmission belt. The dial drives the lifting block, the central column, the pressing plate and the lifting rod to rise through the guide post. The lifting rod drives the rack frame and the ratchet rack to rise. The tension spring is stretched. At the same time, the inner rotating block rotates relative to the lifting block, the outer rotating block rotates relative to the ground pressing box, the sliding rod slides relative to the sliding sleeve, and the spring between the sliding sleeve and the sliding rod is compressed. Subsequently, the dial is disengaged from the guide post, the tension spring rebounds, and the spring between the sliding sleeve and the sliding rod rebounds, causing the lifting block, the pressing plate, the central column, the lifting rod, the rack frame and the ratchet rack to quickly descend, and the foundation is flattened by the pressing plate. There are two blades on the dial, so that the pressing plate continuously rises and falls, and the foundation is flattened at a high frequency.

[0011] Further, the soil pressing mechanism includes a pressing arm rotatably installed on the adjusting arm. A counterweight pressing block is rotatably installed on the pressing arm. A dial rod is rotatably installed on the adjusting arm. A dial post is fixedly installed on the dial rod. The dial post cooperates with the pressing arm.

[0012] Further, a worm is fixedly installed on the ratchet gear. A worm gear is rotatably installed on the frame. The worm meshes with the worm gear. The worm gear drives the dial rod to rotate through gear transmission and belt transmission.

[0013] Furthermore, an adjustment module is provided on the frame body. The adjustment module includes a lower swivel base rotatably mounted on the frame body. A swivel ring is rotatably mounted on the adjustment arm. A lead screw is fixedly mounted on the lower swivel base. The lead screw is slidably mounted with the swivel ring. A strong spring is provided between the swivel ring and the lower swivel base. An internally threaded block is rotatably mounted on the swivel ring. An internal thread is provided on the internally threaded block. The internally threaded block and the lead screw form a screw drive.

[0014] When it is necessary to adjust the angle between the adjustment arm and the frame body, the internally threaded block can be rotated to make the swivel ring slide along the lead screw. In the initial state, the strong spring is in a compressed state. As the swivel ring slides along the lead screw, the strong spring rebounds or is further compressed to a certain extent. At this time, the lower swivel base rotates relative to the frame body, the swivel ring rotates relative to the adjustment arm, and the angle between the adjustment arm and the frame body changes to adapt to more working environments.

[0015] When the lifting rod descends, the ratchet rack drives the ratchet gear and the worm to rotate, thereby driving the worm gear to rotate. Through the gear drive and the belt drive, the shift lever is driven to rotate counterclockwise, thereby driving the shift post to rotate. When the shift post contacts the pressure arm, the pressure arm is driven to rotate relative to the adjustment arm, thereby driving the counterweight block to rise. The counterweight block has a large self-weight and always keeps the bottom surface facing down. When the shift post is separated from the pressure arm, the counterweight block drives the pressure arm to rotate under the action of its own weight, and the foundation is preliminarily flattened by hammering the foundation with the counterweight block. When the equipment moves, the counterweight block first preliminarily flattens the foundation, and then the foundation is highly frequency precisely flattened through the pressing plate.

[0016] The beneficial effects of the present invention compared with the prior art are as follows: (1) The sprinkling module provided in the present invention can clean the traveling track when leveling the foundation, and at the same time, the wet traveling track can wet the foundation soil, which is convenient for pressing; (2) The flattening mechanism provided in the present invention enables the pressing plate to strike the foundation at a high frequency through the cooperation of multiple groups of springs and the cooperation of the dial and the guide post, realizing efficient foundation leveling operation; (3) When the pressing plate provided in the present invention presses the foundation, it will drive the pressure arm to lift at the same time, thereby pre-pressing the foundation at the front end of the equipment through the counterweight block, which is convenient for leveling the foundation when the pressing plate reaches the pre-pressed place and improves the leveling effect. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the base mechanism structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the sprinkling module structure of the present invention.

[0020] Figure 4 It is a schematic diagram of the flattening mechanism structure of the present invention Figure 1 。

[0021] Figure 5 Schematic diagram of the flattening mechanism of the present invention Figure 2 .

[0022] Figure 6 Schematic diagram of the soil pressing mechanism of the present invention Figure 1 .

[0023] Figure 7 Schematic diagram of the soil pressing mechanism of the present invention Figure 2 .

[0024] Figure 8 Schematic diagram of the soil pressing mechanism of the present invention Figure 3 .

[0025] Reference numerals in the attached drawings: 101 - frame body; 102 - traveling wheels; 103 - water tank; 104 - spray pipe; 105 - push - out pipe; 106 - piston cylinder; 107 - one - way rotating piece; 108 - piston piece; 109 - traveling track; 201 - ground - pressing box; 202 - flattening motor; 203 - dial wheel; 204 - lifting rod; 205 - pressing plate; 206 - central column; 207 - rack frame; 208 - ratchet rack; 209 - tension spring; 210 - lifting block; 211 - guide post; 212 - outer rotating block; 213 - inner rotating block; 214 - sliding sleeve; 215 - sliding rod; 301 - adjusting arm; 302 - pressing arm; 303 - counterweight pressing block; 304 - lever; 305 - lever post; 306 - worm; 307 - ratchet gear; 308 - worm gear; 309 - rotating ring; 310 - lower rotating base; 311 - lead screw; 312 - internally - threaded block; 313 - strong spring. Detailed implementation manners

[0026] The following further describes the detailed implementation manners of the present invention with reference to the accompanying drawings.

[0027] Embodiment: Refer to Figures 1-8 , a foundation leveling device for construction engineering, including a base mechanism for moving and watering. The base mechanism includes a frame body 101, a watering module is arranged on the frame body 101. A flattening mechanism for leveling the foundation and a soil pressing mechanism for initially pressing the soil are arranged on the base mechanism. The flattening mechanism includes a ground - pressing box 201, and the soil pressing mechanism includes an adjusting arm 301. A ratchet gear 307 is rotatably installed on the adjusting arm 301; The flattening mechanism includes a lifting rod 204 and a central column 206 slidably installed on the ground - pressing box 201. A pressing plate 205 is fixedly installed on the central column 206. A lifting block 210 is fixedly installed on the central column 206. A guide post 211 is fixedly installed on the lifting block 210. The guide post 211 slides on the ground - pressing box 201. A dial wheel 203 is rotatably installed on the ground - pressing box 201, and the dial wheel 203 is in contact with the guide post 211.

[0028] As Figure 2, Figure 3 As shown in Figure 3 , the base mechanism includes a traveling wheel 102 rotatably mounted on the frame 101. A traveling track 109 is wound around the traveling wheel 102, and a motor for driving the traveling wheel 102 is provided inside the frame 101.

[0029] As Figure 2 , Figure 3 As shown in Figure 2 and Figure 3 , the sprinkling module includes a piston cylinder 106 fixedly mounted on the ground pressing box 201. A water tank 103 is fixedly mounted on the frame 101. The water tank 103 is communicated with the piston cylinder 106 through a push pipe 105. Two spray pipes 104 are fixedly mounted on the water tank 103. A number of nozzles are provided on the spray pipes 104. The lifting rod 204 is slidably mounted on the piston cylinder 106. A piston piece 108 is fixedly mounted on the piston cylinder 106. The piston piece 108 slides along the inner wall of the piston cylinder 106. A one-way rotating piece 107 is rotatably mounted on the piston cylinder 106, and the one-way rotating piece 107 can only rotate inward.

[0030] The two motors inside the frame 101 drive the traveling wheel 102 to rotate, thereby driving the traveling track 109 to rotate, so that the whole device moves and turns.

[0031] When the lifting rod 204 rises, it drives the piston piece 108 to slide upward along the piston cylinder 106. At this time, the one-way rotating piece 107 closes, and the gas above the piston piece 108 is pushed into the water tank 103 through the push pipe 105. The water in the water tank 103 is sprayed out from the nozzles of the spray pipes 104 to clean the traveling track 109. At the same time, the wet traveling track 109 can wet the foundation soil, which is convenient for pressing. When the lifting rod 204 descends, the piston piece 108 slides downward along the piston cylinder 106. The negative pressure causes the one-way rotating piece 107 to rotate inward, and the outside gas enters the piston cylinder 106. In this way, the water in the water tank 103 is continuously sprayed out from the nozzles of the spray pipes 104.

[0032] As Figure 4 , Figure 5 As shown in Figure 4 and Figure 5 , the flattening mechanism further includes a flattening motor 202 fixedly mounted on the ground pressing box 201. The flattening motor 202 drives the dial wheel 203 to rotate through a transmission belt. The pressing plate 205 is fixedly mounted on the lifting rod 204. A tension spring 209 is provided between the lifting block 210 and the ground pressing box 201. A rack frame 207 is fixedly mounted on the lifting rod 204. A ratchet rack 208 is slidably mounted on the rack frame 207. A spring is provided between the ratchet rack 208 and the rack frame 207. The ratchet rack 208 meshes with the ratchet gear 307.

[0033] As Figure 4 , Figure 5As shown in the figure, two outer rotating blocks 212 are rotatably installed inside the ground pressing box 201. A sliding sleeve 214 is fixedly installed on the outer rotating block 212. A sliding rod 215 is slidably installed inside the sliding sleeve 214. An inner rotating block 213 is fixedly installed on the sliding rod 215. The inner rotating block 213 is rotatably installed with the lifting block 210. A spring is arranged between the sliding rod 215 and the sliding sleeve 214.

[0034] The flattening motor 202 drives the dial 203 to rotate through a transmission belt. The dial 203 drives the lifting block 210, the central column 206, the pressing plate 205 and the lifting rod 204 to rise through the guide post 211. The lifting rod 204 drives the rack frame 207 and the ratchet rack 208 to rise. The tension spring 209 is stretched. At the same time, the inner rotating block 213 rotates relative to the lifting block 210, the outer rotating block 212 rotates relative to the ground pressing box 201, the sliding rod 215 slides relative to the sliding sleeve 214, and the spring between the sliding sleeve 214 and the sliding rod 215 is compressed. Subsequently, the dial 203 is disengaged from the guide post 211. The tension spring 209 rebounds, and the spring between the sliding sleeve 214 and the sliding rod 215 rebounds, causing the lifting block 210, the pressing plate 205, the central column 206, the lifting rod 204, the rack frame 207 and the ratchet rack 208 to quickly descend. The foundation is flattened by the pressing plate 205. There are two blades on the dial 203, so that the pressing plate 205 rises and falls continuously, and the foundation is flattened at a high frequency.

[0035] As Figures 6-8 shown in the figure, the soil pressing mechanism includes a pressing arm 302 rotatably installed on the adjusting arm 301. A counterweight pressing block 303 is rotatably installed on the pressing arm 302. A dial rod 304 is rotatably installed on the adjusting arm 301. A dial post 305 is fixedly installed on the dial rod 304. The dial post 305 cooperates with the pressing arm 302.

[0036] As Figures 6-8 shown in the figure, a worm 306 is fixedly installed on the ratchet gear 307. A worm gear 308 is rotatably installed on the frame body 101. The worm 306 meshes with the worm gear 308. The worm gear 308 drives the dial rod 304 to rotate through gear transmission and belt transmission.

[0037] As Figures 6-8 shown in the figure, an adjusting module is arranged on the frame body 101. The adjusting module includes a lower rotating seat 310 rotatably installed on the frame body 101. A rotating ring 309 is rotatably installed on the adjusting arm 301. A lead screw 311 is fixedly installed on the lower rotating seat 310. The lead screw 311 is slidably installed with the rotating ring 309. A strong spring 313 is arranged between the rotating ring 309 and the lower rotating seat 310. An internally threaded block 312 is rotatably installed on the rotating ring 309. Internal threads are arranged on the internally threaded block 312. The internally threaded block 312 forms a threaded transmission with the lead screw 311.

[0038] When it is necessary to adjust the angle between the adjusting arm 301 and the frame body 101, the internally threaded block 312 can be rotated to make the swivel ring 309 slide along the lead screw 311. In the initial state, the strong spring 313 is in a compressed state. As the swivel ring 309 slides along the lead screw 311, the strong spring 313 rebounds or is further compressed to a certain extent. At this time, the lower swivel base 310 rotates relative to the frame body 101, the swivel ring 309 rotates relative to the adjusting arm 301, and the angle between the adjusting arm 301 and the frame body 101 changes to adapt to more working environments.

[0039] When the lifting rod 204 descends, the ratchet rack 208 drives the ratchet gear 307 and the worm 306 to rotate, thereby driving the worm gear 308 to rotate. The dial rod 304 is driven to rotate counterclockwise through gear transmission and belt transmission, thereby driving the dial post 305 to rotate. When the dial post 305 contacts the pressure arm 302, the pressure arm 302 is driven to rotate relative to the adjusting arm 301, thereby driving the counterweight pressing block 303 to rise. The counterweight pressing block 303 has a large self-weight and always keeps the bottom surface facing downwards. When the dial post 305 is separated from the pressure arm 302, the counterweight pressing block 303 drives the pressure arm 302 to rotate under the action of its own weight, and the foundation is initially leveled by hammering the foundation with the counterweight pressing block 303. When the equipment moves, the counterweight pressing block 303 first initially levels the foundation, and then the foundation is highly frequency precisely leveled through the pressing plate 205.

[0040] The working principle of a foundation leveling device for construction projects disclosed by the present invention is as follows: Two motors within the frame 101 drive the driving wheels 102 to rotate, thereby driving the running tracks 109 to rotate, enabling the overall movement and steering of the device. The flattening motor 202 drives the dial 203 to rotate through a transmission belt. The dial 203 drives the lifting block 210, the central column 206, the pressing plate 205, and the lifting rod 204 to rise through the guide column 211. The lifting rod 204 drives the rack frame 207 and the ratchet rack 208 to rise, stretching the tension spring 209. At the same time, the inner rotating block 213 rotates relative to the lifting block 210, the outer rotating block 212 rotates relative to the ground pressing box 201, and the sliding rod 215 slides relative to the sliding sleeve 214. The spring between the sliding sleeve 214 and the sliding rod 215 is compressed. Subsequently, the dial 203 disengages from the guide column 211, the tension spring 209 rebounds, and the spring between the sliding sleeve 214 and the sliding rod 215 rebounds, causing the lifting block 210, the pressing plate 205, the central column 206, the lifting rod 204, the rack frame 207, and the ratchet rack 208 to rapidly descend. When the lifting rod 204 descends, the ratchet rack 208 drives the ratchet gear 307 and the worm 306 to rotate, thereby driving the worm gear 308 to rotate. Through gear transmission and belt transmission, the lever 304 is driven to rotate counterclockwise, thereby driving the dial post 305 to rotate. When the dial post 305 contacts the pressing arm 302, it drives the pressing arm 302 to rotate relative to the adjusting arm 301, thereby driving the counterweight pressing block 303 to rise. The counterweight pressing block 303 has a large self-weight and always keeps its bottom facing downwards. When the dial post 305 disengages from the pressing arm 302, the counterweight pressing block 303 drives the pressing arm 302 to rotate under the action of its own weight, and the foundation is hammered by the counterweight pressing block 303 to perform preliminary flattening of the foundation. The foundation is flattened by the pressing plate 205. There are two blades on the dial 203, causing the pressing plate 205 to continuously rise and fall, achieving high-frequency flattening of the foundation. When the device moves, the counterweight pressing block 303 first performs preliminary flattening of the foundation, and then high-frequency fine flattening of the foundation is achieved through the pressing plate 205.

[0041] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope of the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A ground leveling device for construction engineering, comprising a base mechanism for movement and watering, characterized in that: The base mechanism comprises a frame (101), a watering module is arranged on the frame (101), a flattening mechanism for leveling the foundation and a soil compacting mechanism for preliminary soil compacting are arranged on the base mechanism, the flattening mechanism comprises a soil compacting box (201), and the soil compacting mechanism comprises an adjusting arm (301), a ratchet gear (307) is rotatably mounted on the adjusting arm (301); The flattening mechanism comprises a lifting rod (204) and a center column (206) slidably mounted on a ground pressing box (201); a pressing plate (205) is fixedly mounted on the center column (206); a lifting block (210) is fixedly mounted on the center column (206); a guide column (211) is fixedly mounted on the lifting block (210); the guide column (211) slides on the ground pressing box (201); a thumbwheel (203) is rotatably mounted on the ground pressing box (201); the thumbwheel (203) is in contact with the guide column (211).

2. A foundation leveling device for construction engineering according to claim 1, characterized in that: The base mechanism comprises a running wheel (102) rotatably mounted on a frame (101), a running track (109) being wound around the outside of the running wheel (102), and a motor for driving the running wheel (102) is arranged inside the frame (101).

3. A foundation leveling device for construction engineering according to claim 2, characterized in that: The watering module comprises a piston cylinder (106) fixedly mounted on a ground pressure box (201); a water tank (103) fixedly mounted on the frame (101); the water tank (103) and the piston cylinder (106) are connected via a push-out pipe (105); two spray pipes (104) are fixedly mounted on the water tank (103); a plurality of spray heads are arranged on the spray pipes (104); a lifting rod (204) and the piston cylinder (106) are slidably mounted; a piston plate (108) is fixedly mounted on the piston cylinder (106); the piston plate (108) slides along the inner wall of the piston cylinder (106); a one-way rotating plate (107) is rotatably mounted on the piston cylinder (106); and the one-way rotating plate (107) can only rotate inwards.

4. The ground leveling equipment for construction engineering according to claim 1, characterized in that: The flattening mechanism further comprises a flattening motor (202) fixedly mounted on the ground-pressing box (201); the flattening motor (202) drives the dial wheel (203) to rotate via a transmission belt; the pressing plate (205) and the lifting rod (204) are fixedly mounted; a tension spring (209) is arranged between the lifting block (210) and the ground-pressing box (201); a rack rack (207) is fixedly mounted on the lifting rod (204); a ratchet bar (208) is slidably mounted on the rack rack (207); a spring is arranged between the ratchet bar (208) and the rack rack (207); and the ratchet bar (208) is meshed with a ratchet gear (307).

5. The ground leveling equipment for construction engineering according to claim 4, characterized in that: Two outer rotating blocks (212) are rotatably mounted in the ground pressure box (201), a sliding sleeve (214) is fixedly mounted on the outer rotating block (212), a sliding rod (215) is slidably mounted in the sliding sleeve (214), an inner rotating block (213) is fixedly mounted on the sliding rod (215), the inner rotating block (213) is rotatably mounted on the lifting block (210), and a spring is arranged between the sliding rod (215) and the sliding sleeve (214).

6. The ground leveling equipment for construction engineering according to claim 1, characterized in that: The soil pressing mechanism comprises a pressing arm (302) rotatably mounted on an adjusting arm (301), a counterweight pressing block (303) rotatably mounted on the pressing arm (302), a shifting rod (304) rotatably mounted on the adjusting arm (301), a shifting post (305) fixedly mounted on the shifting rod (304), and the shifting post (305) cooperates with the pressing arm (302).

7. The ground leveling equipment for construction engineering according to claim 6, characterized in that: A worm (306) is fixedly mounted on the ratchet gear (307), a worm wheel (308) is rotatably mounted on the frame (101), the worm (306) is meshed with the worm wheel (308), and the worm wheel (308) drives the lever (304) to rotate through gear transmission and belt transmission.

8. The ground leveling equipment for construction engineering according to claim 7, characterized in that: The frame (101) is provided with an adjustment module, the adjustment module comprising a lower rotating seat (310) rotatably mounted on the frame (101), a rotating ring (309) rotatably mounted on the adjustment arm (301), a screw rod (311) fixedly mounted on the lower rotating seat (310), the screw rod (311) and the rotating ring (309) being slidably mounted, a strong spring (313) being arranged between the rotating ring (309) and the lower rotating seat (310), an internal thread block (312) being rotatably mounted on the rotating ring (309), the internal thread block (312) being provided with internal threads, and the internal thread block (312) and the screw rod (311) forming a threaded transmission.

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