31results about How to "Play the role of support and reinforcement" patented technology

The invention relates to the field of foundation pit supporting, in particular to a foundation pit supporting structure and a construction method thereof. According to the specific scheme, the foundation pit supporting structure comprises a foundation pit and a plurality of mutually-spliced protection plates, each protection plate is provided with a supporting pipe, one side wall of each protection plate is provided with a through groove for containing the corresponding supporting pipe, and the supporting pipes are detachably connected into the through grooves. A plurality of water seepage holes are formed in the ends, extending out of the through grooves, of the supporting pipes, adjusting assemblies used for adjusting the water seepage amount of the water seepage holes are arranged in the supporting pipes, the two ends of the supporting pipes are both closed ends, a drainage cavity is formed in each protection plate and located in the lower portion of each through groove, the throughgrooves and the drainage cavities communicate with communicating holes, and drainage holes are formed in one sides of the supporting pipes. The drainage holes communicate with the communicating holes, a water storage tank is arranged on the foundation pit, a water suction pump is arranged in the end, away from the bottom of the foundation pit, of each protection plate, drainage pipes are arrangedbetween the water suction pumps and the water storage tank in a communicating mode, and water suction pipes are arranged between the water suction pumps and the drainage cavities in a communicating mode.

The invention discloses a steel bridge capable of being used as a supporting and reinforcing structure, comprising an inclined bridge body and steel columns for supporting the bridge body, wherein a bridge head is supported on a crown beam at the top of a supporting structure of a foundation pit; bridge feet are supported at the bottom of the foundation pit; the bottom face of the bridge head is fixedly connected with a force transmission cross beam which extends along the width direction of the bridge body; the front side face of the force transmission cross beam is mutually adhered to the side face of the crown beam; an inclined supporting rod is arranged between the force transmission cross beam and the bottom of the foundation pit; the upper end of the inclined supporting rod is fixedly connected with the force transmission cross beam; and the lower end of the inclined supporting rod is fixedly connected with the foundation pit. According to the steel bridge, the supporting structure of the bridge head can be effectively supported and reinforced, and an independent reinforcing structure or supporting structure does not need to be arranged, so that the engineering cost is greatly reduced.

The invention discloses a press buckle type rock wool composite board and a manufacturing method thereof, and belongs to the technical field of heat insulation material preparation. The composite board comprises rock wool base body layers, a reinforcing layer, a surface layer and a press buckle structure, wherein the reinforcing layer is arranged between the rock wool base body layers in a clampedway, and achieves the effects of supporting and reinforcement; the intensity of the rock wool base body layers is well enhanced, so that the overall intensity of the rock wool base body layers is improved by at least 100 times or higher; the surface layer is connected with the reinforcing layer through the press buckle structure, and is tightly attached onto the rock wool base body layer. Throughthe designed structure, the mode that the surface layer is adhered by polymer cement mortar in the prior art is changed; the polymer cement mortar is not used as much as possible; the emission of benzene and benzene derivatives is reduced; the use of the composite board is safer and more reliable; the heat insulation, sound insulation and fireproof effects are obvious.

The invention discloses an auxiliary device for a hydroelectric slotting machine, comprising vertical rods, horizontal rods are fixed between the vertical rods, threaded rods are threaded on the vertical rods, handles are fixed on the upper ends of the threaded rods, fixed blocks are fixed on the lower ends, and the horizontal rods There is a sleeve A on the upper sleeve, a support rod is fixed on the sleeve A, and a sleeve B is sleeved on the support rod. Connecting rod, the disc is fixed on the connecting rod, there is a horizontal plate on the disc, the disc is connected in rotation in the horizontal plate, the side end of the horizontal plate is threaded with the bolt B, the horizontal plate is provided with a through groove, and inserted into the through groove There is a slide bar, one end of the slide bar is fixed with a baffle plate, and the other end is fixed with a hydroelectric slotting machine, the baffle plate is threadedly connected with a bolt C, a level measuring device is installed on the sleeve A, and a laser transmitter is installed on the horizontal plate. The device can perform horizontal cutting, vertical cutting and oblique cutting, which is convenient and fast, saves time and effort, and at the same time plays the role of support and reinforcement.

The invention provides a training device for aerobics exercising. The training device comprises leg pressing rods, waist pillows, waist pillow locating rings, bending supporting rods, adjusting nuts,supporting rails, holding rods and main supporting rods, a vertical rail at the right side extends and protrudes to the outer side and is fixedly welded to a middle inverted supporting plate; four bending training devices are supported and welded to the top of a left baseboard from left to right in sequence, and each bending training device comprises the waist pillows, the waist pillow locating rings, the four bending supporting rods, the adjusting nuts, the two supporting rails and the holding rods, the four bending supporting rods are horizontally and symmetrically arranged into two groups,two symmetric supporting rails are further horizontally welded to the two bending supporting rods at the inner side, and one holding rod is further connected between the two supporting rails; a layerof wrapping sponge is arranged at the top of a shoulder plate. Through the arrangement of a fixing plate, the fixing plate can support and reinforce the inverted supporting plates at the left portionand the right portion, and the inverted supporting plates are prevented from being hit by the body and toppling.

The invention discloses a soft touch screen protective film. The protective film comprises a polyethylene terephthalate (PET) film layer, a supporting layer, a silica gel layer, a fluoride release film and a buffer layer; the supporting layer is attached to the bottom of the PET film layer; the silica gel layer is attached to the bottom of the supporting layer; one side, far away from the supportlayer, of the silica gel layer is connected with the buffer layer; and one side, far away from the silica gel layer, of the buffer layer is connected with the fluoride release film, wherein the thickness of the fluoride release film is 50 microns. The buffer layer comprises a first high-transparency PET film, a second high-transparency PET film and a third high-transparency PET film, wherein the first high-transparency PET film is attached to the bottom of the silica gel layer, the second high-transparency PET film is connected to the bottom of the first high-permeability PET film, and the third high-transparency PET film is connected to the bottom of the second high-permeability PET film. The soft touch screen protective film can well prevent a situation that bubbles is generated when thefilm is adhered to a mobile phone touch panel, so that adhesion is facilitated, and meanwhile, a situation that damage to a human bodies due to the fact that a conventional toughened glass film is easily broken is avoided.

The invention describes a sound insulation device for processing noise, which includes a base pier and an arc-shaped sound insulation board arranged on the base pier. A groove is opened on the upper surface of the sound insulation board, and a groove matching the shape of the sound insulation board is slidingly arranged in the groove. The matching extension section, the extension section includes successively connected iron plates and rock wool layers, a dovetail groove is opened on the upper groove wall of the sound insulation board, a dovetail protrusion is installed slidingly in the dovetail groove, and a dovetail protrusion is set on one side of the upper end surface of the dovetail protrusion There are magnets that can be magnetically attached to the iron plate. The sound insulation board in the present invention can isolate the noise generated by the expressway, so as to avoid harm to the health of the human body. The extension section is slidingly installed in the sound insulation panel, and the height of the sound insulation can be adjusted according to the location of the noise source, so as to ensure that the noise generated by the road can be completely blocked and absorbed.

The invention discloses a grounding protection assembly and a rat-proof structure thereof. The rat-proof structure comprises a body and an auxiliary connecting body; the body is provided with a firstthrough hole and a first connecting port penetrating through the first through hole, the body is arranged on an electric pole in a sleeving mode through the first through hole, the body is arranged ona grounding body in a sleeving mode through the first connecting port, and the body is further provided with a first connecting part used for enabling the caliber of the first connecting port to be reduced; and the auxiliary connecting body is arranged on the body, the auxiliary connecting body is provided with a connecting through hole communicating with the first through hole, and the auxiliaryconnecting body is arranged on the electric pole in a sleeving mode through the connecting through hole. The rat-proof structure can be tightly matched with the electric pole, so that the rat-proof structure is prevented from falling off from the electric pole; therefore, the grounding protection assembly adopting the rat-proof structure can effectively avoid damage of rats to electrical equipment.

The multipurpose steel structure decorative ceiling comprises an inner wall and a steel structure top frame, a limiting cylinder is installed at the bottom end of the steel structure top frame, the inner wall is located on one side of the limiting cylinder, a guide pulley is installed at the position, on the other side of the limiting cylinder, of the bottom end of the steel structure top frame, and a top plate is rotationally installed on the upper surface of the inner side wall of the inner wall. An inserting rod is movably installed at the top end of the top plate in a limiting mode through a limiting component, an inserting mechanism is installed between the inserting rod and the limiting cylinder, a multipurpose half hole is formed in the surface of the end, away from the inner wall, of the top plate, a traction mechanism is cooperatively installed between the multipurpose half hole and the guide pulley, and a lamp frame is installed at the bottom end of the top plate below the multipurpose half hole. According to the ceiling and the assembly construction method thereof, by arranging a series of structures, the assembly direction can be changed, construction is facilitated, meanwhile, hole body covering is flexibly conducted by means of the lamp frame, the attractiveness is improved, the construction steps are saved, assembly construction is conducted by means of a semi-hoisting mode, and follow-up overhauling, wiring and other operations are facilitated.

The invention discloses a steel bridge capable of being used as a supporting and reinforcing structure, comprising an inclined bridge body and steel columns for supporting the bridge body, wherein a bridge head is supported on a crown beam at the top of a supporting structure of a foundation pit; bridge feet are supported at the bottom of the foundation pit; the bottom face of the bridge head is fixedly connected with a force transmission cross beam which extends along the width direction of the bridge body; the front side face of the force transmission cross beam is mutually adhered to the side face of the crown beam; an inclined supporting rod is arranged between the force transmission cross beam and the bottom of the foundation pit; the upper end of the inclined supporting rod is fixedly connected with the force transmission cross beam; and the lower end of the inclined supporting rod is fixedly connected with the foundation pit. According to the steel bridge, the supporting structure of the bridge head can be effectively supported and reinforced, and an independent reinforcing structure or supporting structure does not need to be arranged, so that the engineering cost is greatly reduced.

The invention provides high-strength flexible stainless steel which comprises the following components in percentage by mass: more than 0 and less than or equal to 0.050% of C, more than 0 and less than or equal to 1.00% of Si, 8.00%-15.00% of Mn, less than or equal to 0.045% of P, less than or equal to 0.030% of S, 13.00%-18.00% of Cr, 4.00%-8.00% of Ni, 1.50%-4.00% of Cu, more than 0 and less than or equal to 0.050% of N and the balance of Fe and inevitable impurities. The stainless steel part for tunnel repair comprises a semicircular arch part, the arch part is formed by combining a left quarter ring and a right quarter ring, the left quarter ring and the right quarter ring are a left arch part and a right arch part respectively, and the arch part is of a U-shaped structure with an upward opening. The upper end of the left arch part and the upper end of the right arch part are each provided with a first connecting hole, the first connecting holes penetrate through the arch parts in the front-back direction, the two ends of the connecting part are inserted into the two first connecting holes to be used for connecting the left arch part and the right arch part, the two ends of the connecting part extend to the outer sides of the arch parts, and the two ends of the connecting part are connected with connecting discs in a sleeved mode. The connecting disc is welded with the connecting piece, the left arch piece and the right arch piece.

The invention belongs to the technical field of slope greening, and particularly relates to a stone abrupt slope ecological greening fixing device. The device comprises a greening planting blanket, the greening planting blanket is internally provided with a greening planting groove, a plurality of slope fixing pieces which are symmetrical along the center line of the greening planting blanket arearranged on the greening planting blanket, and a slope rolling stone prevention protection assembly is arranged at the top of the greening planting blanket and corresponds to the greening planting groove in position, a water storage irrigation piece is arranged on the greening planting blanket, the device further comprises a rainwater collector located above the greening planting blanket, and therainwater collector is connected with the water storage irrigation piece. The stone abrupt slope ecological greening fixing device has the advantages of being high in reinforcing strength, good in stability and good in greening community stability.

The invention discloses a column-top overturn-preventing device for jacking a formwork system. The column-top overturn-preventing device for jacking the formwork system comprises four supporting columns, wherein column-top fulcrum bearings are installed at the tops of the four cylindrical supporting columns, an overturn-preventing mechanism is connected to the side walls of the column-top fulcrumbearings through bolts, and a main truss is clamped to the overturn-preventing mechanism in a fitting mode. The main function of the overturn-preventing mechanism is that overturn of an upper part steel platform is prevented, for a truss type climbing steel platform system, joints between an upper steel truss and columns are very important, in order to prevent the truss from overturning, the column-top overturn-preventing device can play supporting and strengthening roles and can prevent the truss from overturning as well. The column-top overturn-preventing device for jacking the formwork system can be welded and strengthened on the spot, is simple and convenient in construction, has good economic benefits and social benefits, and is suitable for popularization and use.

The invention relates to the technical field of animal husbandry, in particular to an animal husbandry hoof trimming fixing device based on simultaneous positioning of multiple feet. The device comprises a first supporting piece, a first fixing rod is arranged on the first supporting piece, a lead screw nut is fixedly connected to the center of the surface of the side wall of the first fixing rod, a second fixing rod is arranged on a second supporting piece, a limiting sleeve is fixedly connected to the center of the surface of the side wall of the second fixing rod, and a sliding hole is formed in the center of the surface of the side wall of a sliding sleeve. The first fixing part at least comprises an adjusting sleeve, a sleeve hole is formed in the center of the surface of the side wall of the adjusting sleeve, a limiting groove communicated with the sleeve hole is formed in the positioning lug, a positioning hole communicated with the limiting groove is formed in the upper surface of the positioning lug, a fixing seat is fixedly connected to the surface of the side wall of the right positioning lug, and a retaining ring is hinged to one side of the side wall of the fixing seat. The other side of the side wall of the fixing base is fixedly connected with a hook-and-loop fastener, multiple feet can be positioned together when the livestock is subjected to hoof trimming through the fixing mechanism, and the problem that people are hurt by the feet in the hoof trimming process can be effectively solved.

The invention provides a large-span rack movable type rolling mill drag chain device which comprises a first sliding rail, a second sliding rail, a supporting frame and drag chains. The first slidingrail is installed on a transmission side fixed rack platform, the second sliding rail is installed on an operation side movable rack platform, the first sliding rail and the second sliding rail are oppositely arranged, and the two ends of the supporting frame are connected with the drag chains. the ends, away from the supporting frame, of the drag chains are arranged at the bottom of the supporting frame, the ends, away from the supporting frame, of the two drag chains extend inwards, the end, away from the supporting frame, of one drag chain is fixedly connected with the transmission side fixed rack platform, and the end, away from the supporting frame, of the other drag chain is fixedly connected with the operation side movable rack platform; and rollers are installed at the two ends ofthe supporting frame through installation frames. According to the large-span rack movable type rolling mill drag chain device, the problem that when the drag chains work, the supporting force cannotsupport the sum of the self weight of the drag chains and the weight of a plurality of connecting pipelines, so that the work of the movable type rolling mill is influenced, and the movable type rolling mill cannot work is solved.

The invention discloses an outdoor power distribution cabinet with a windproof structure; the cabinet comprises a base, the two ends of the base are both provided with fixing pieces, an air pump is fixedly connected to a sealed air box, the two ends of the sealed air box are both fixedly connected with telescopic cylinders, and one ends of the two telescopic cylinders are both fixedly connected with reinforcing plates. Pneumatic devices are arranged in the two telescopic cylinders, and a reinforcing device is arranged outside the cabinet body. The cabinet is reasonable in structure, the direct stress area of wind and the cabinet body can be reduced through automatic movement of two baffles, a third induction ring moves to abut against a fourth induction ring, two reinforcing plates are pushed to abut against the inner walls of the two sides of the cabinet body respectively, and the supporting and reinforcing effects are achieved; and meanwhile, two rack plates are driven to move through movement of the two reinforcing plates, so that the cabinet body and the base can be well reinforced, and the windproof and stable effects are guaranteed.

The invention provides an anti-corrosion cement electric pole with a stable structure, and relates to the technical field of electric power equipment. The anti-corrosion cement electric pole with thestable structure comprises a concrete pole body, wherein the two sides of a storage battery are fixedly connected with solar cell panels through two second connecting rods; the top of the storage battery is fixedly connected with a wind driven generator; the top end of a first connecting rod is fixedly connected with a lamp holder; an illuminating lamp is arranged on the bottom of the lamp holder;and shock absorbers are arranged on the upper part, the middle part and the lower part of the inner diameter of a supporting plate. The supporting plate can achieve supporting and reinforcing effectson the electric pole, and shear thickening liquid in the shock absorbers can absorb impact force generated during collision, so that the electric pole is protected; the illuminating lamp on the concrete pole body can illuminate pedestrians on the road; and wind energy and solar energy can be converted into electric energy through the wind driven generator and the solar cell panels, and the electric energy is stored in the storage battery and supplies power to the illuminating lamp, so that energy is greatly saved, and therefore, the anti-corrosion cement electric pole is worthy of being greatly popularized.

The invention aims to solve the protection problem of road collapse, and discloses a municipal protection device for preventing road collapse, which comprises a bottom plate, lantern rings are uniformly sleeved in the bottom plate, sealing rings are sleeved on the inner walls of the lantern rings, screw rods are sleeved in the lantern rings, a second sliding frame and a first sliding frame are fixedly connected to the left end and the right end of the bottom plate correspondingly, water pumps are fixedly installed on the outer surfaces of the first sliding frame and the second sliding frame correspondingly, a first guide pipe and a second guide pipe are connected to the water pumps, through holes are evenly formed in the surface of the first guide pipe, and a first sliding block is sleeved in the first sliding frame; and a second sliding block is sleeved with the second sliding frame, a guide rod is fixedly installed between the first sliding block and the second sliding block, and the guide rod is sleeved with a sliding pipe. The screw rods are reasonably embedded into the portion, around the collapse position, of the road, and the multiple screw rods are used for achieving the supporting and reinforcing effects, so that the road is prevented from further collapsing, and safety protection is effectively conducted on the road.

The invention discloses a vertical folding type disaster relief folding bed. The folding bed comprises a first bed frame and a second bed frame; two rotating rods are symmetrically and fixedly connected to the left side wall and the right side wall of each of the first bed frame and the second bed frame; each of the rod walls, corresponding to the first bed frame and the second bed frame, of the rotating rods is connected with a same folding rod in a rotating mode; the middle parts of every two folding rods located on the same side sleeve a same rotating shaft in a rotating mode through a through hole; the ends, far away from the folding rods, of the rotating shafts are fixedly connected with sleeves; a threaded rod is connected between every two sleeves located on the same side in a sleeved mode; and the rod walls at the two ends of the threaded rods are fixedly sleeved with fixing blocks. Compared with most of existing disaster relief folding beds, the vertical folding type disasterrelief folding bed has the advantages that in the case that the occupied area is not changed, the first bed frame and the second bed frame can both allow people to have a rest, and therefore the purpose that more disaster victims can be resettled on a limited place of residence can be achieved.

The invention discloses a multi-purpose steel structure decorative ceiling and an assembling and construction method thereof, comprising an inner wall and a steel structure roof frame, a limit cylinder is installed at the bottom end of the steel structure roof frame, and the inner wall is on one side of the limit cylinder, and A guide pulley is installed at the bottom end of the steel structure top frame on the other side of the limit cylinder, a top plate is rotatably installed on the upper surface of the inner side wall of the inner wall, and an insertion rod is installed at the top of the top plate through the limit part to limit the movement, and the insertion rod is connected with the rod. A plug-in mechanism is installed between the limit cylinders, the top plate is provided with a multi-purpose half hole on the surface of one end away from the inner wall, and a traction mechanism is installed between the multi-purpose half hole and the guide pulley, and the bottom end of the top plate under the multi-purpose half hole is installed. light frame. By setting a series of structures in the present invention, the suspended ceiling and its assembling and construction method can change the assembling orientation, which is beneficial to the construction, and at the same time, the light frame is flexibly used to cover the hole body, which increases the aesthetics and saves the construction steps. Assembly construction is convenient for subsequent maintenance, wiring and other operations.

The invention relates to the technical field of kneecaps, in particular to a safe kneecap device for old people, comprising a base and a kneecap cylinder, one end of the base is fixedly welded with a fixing block, the front end of the fixing block is integrally provided with a T-shaped rail, and the base at the front end of the fixing block is provided with a moving groove; a supporting plate is fixedly welded to the base at the front end of the moving groove, a threaded hole is formed in the supporting plate, a fixing plate is integrally formed at the other end of the base, and the height of the kneecap cylinder can be adjusted by rotating the rotating column, so that the kneecap cylinder can adapt to the height of the legs of a patient; it is guaranteed that the patient can be in a comfortable sitting posture or lying posture for leg knee treatment, the patient feels comfortable, and meanwhile a worker can operate the knee protection device conveniently.

The invention discloses gas conveying equipment for metallurgical machinery. The gas conveying equipment structurally comprises a control panel, a gas conveyor and a gas conveying pipe, wherein the control panel and the gas conveyor are locked and electrically connected; the gas conveyor and the gas conveying pipe are installed and connected; the gas conveyor comprises gas storage fasteners, a gasstorage machine and gas storage limit slots, and the gas storage fasteners are arranged on the gas storage machine; a pipeline spiral ring and a pipeline are embedded, and the tightness of the pipeline spiral ring and the pipeline is strengthened through the thread design; melt glue blocks are filled between the pipeline spiral ring and the pipeline, so that the sealing property is enhanced, andonce the fatigue break occurs at a joint, the pipeline connected to a gas blow-out position is hammered by a tool and the pipeline spiral ring, the pipeline and the gas conveyor are further embedded and reinforced; and the melt glue blocks flow in a connecting port of the pipeline spiral ring and the pipeline when the melt glue blocks are melted, the pipeline gas no longer flows, the gas discharging amount is controlled in time, and the occurrence of large-scale explosion combustion is avoided.

The invention discloses a vehicle barrier rod device based on security and defense engineering. The device comprises a vehicle barrier rod body, packaging covers connected to the two ends of the vehicle barrier rod body, and buffer plates arranged on the two sides of the vehicle barrier rod body. The buffer plates are arranged on the outer sides of vertical rods, so that a buffer effect is achieved on the vehicle barrier rod body, and the service time of the vehicle barrier rod body is prolonged; reflective stickers are attached to the outer sides of the buffer plates, so that a driver can observe the position of the vehicle barrier rod conveniently; mounting holes are arranged in the vehicle barrier rod body, so that people can install placards or signs with parking patterns conveniently;a reinforcing plate is installed at a joint of each connecting plate and the corresponding vertical plate, so that a role of supporting and reinforcing can be exerted; the packaging covers are arranged to package the two ends of the vehicle barrier rod, and a sealing ring is arranged on the outer side edge of an inserting plate, so that the sealing performance of connecting the packaging covers and the vehicle barrier rod body is improved, and a situation that the interior of the vehicle barrier rod body is corroded due to the fact that the rainwater sinks into the vehicle barrier rod body isavoided; and furthermore, an anti-collision strip is arranged, so that the bottom of the vehicle barrier rod body is protected, and the damage degree of the vehicle barrier rod body is reduced.

The invention relates to the field of building engineering construction, in particular to a method for reducing bending failure of tubular piles in soft soil. The method comprises the following steps of (1) surveying and detecting a soil layer of a construction site; (2) arranging a first reinforcing layer in the position of the designed elevation; (3) arranging a second reinforcing layer in the position of the designed elevation, wherein the second reinforcing layer is located above the first reinforcing layer; (4) driving at least two tubular piles into the soil layer, wherein the tubular piles penetrate through the second reinforcing layer and the first reinforcing layer in sequence; (5) detecting the bearing capacity of the tubular piles; and (6) checking and accepting. According to the method, the first reinforcing layer and the second reinforcing layer are arranged in the soil layer in advance, the two reinforcing layers form a constraint body for the tubular piles at the designed elevation, and the tubular piles can be supported and reinforced, so that the bending failure of the soil layer pressure to the tubular piles is reduced, the bearing capacity of the tubular piles in soft soil is increased to the maximum, and at least two tubular piles are arranged in the two reinforcing layers, so that the overall bearing capacity of the tubular piles can be increased.

The invention discloses a novel hidden spring hinge. The novel hidden spring hinge comprises a hinge body and a driving part for driving the hinge body to be closed. The hinge body comprises a frame connecting piece, a sash connecting piece, a first connecting rod and a second connecting rod; a first sliding groove is formed in the frame connecting piece, a second sliding groove is formed in the sash connecting piece, and one end of the first connecting rod is connected with the frame connecting piece in a pivoted mode; meanwhile, the other end of the first connecting rod is in sliding fit with the second sliding groove, one end of the second connecting rod is simultaneously connected with the sash connecting piece and the first connecting rod in a pivoted mode, and other end of the secondconnecting rod is in sliding fit with the first sliding groove. The driving part comprises a sleeve, an upper ratchet wheel, a lower ratchet wheel, a torsion spring and a rotating shaft, wherein theupper ratchet wheel, the lower ratchet wheel, the torsion spring and the rotating shaft are arranged in the sleeve from top to bottom in sequence, the upper end and the lower end of the torsion springare correspondingly and fixedly connected with the lower ratchet wheel and the rotating shaft, and the upper ratchet wheel is fixedly connected with the sleeve.