CN115478670A

CN115478670A - Safety protection system of lifting support

Info

Publication number: CN115478670A
Application number: CN202211310569.9A
Authority: CN
Inventors: 凤兆琪; 汪东福; 罗仕兵; 陈世文; 刘琦; 谢晶; 屈燕
Original assignee: Xuancheng Municipal Construction Group Co ltd
Current assignee: Xuancheng Municipal Construction Group Co ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2022-12-16

Abstract

The invention discloses a safety protection system of a lifting support, which comprises a locking device arranged on the lifting support, wherein the lifting support comprises a platform plate and a hoisting mechanism, a frame body is arranged on the frame body in a sliding manner, the platform plate is used for controlling the platform plate to lift, the frame body comprises vertical rods and transverse rods, the transverse rods are arranged between every two adjacent vertical rods, the locking device comprises a locking piece arranged on the vertical rods, a plurality of locking grooves are formed in the locking piece, the locking grooves are distributed along the vertical direction, a fixed block is arranged on the platform plate, a first sliding groove is formed in the fixed block, a locking rod is arranged in the first sliding groove in a sliding manner, a tension mechanism for preventing the locking rod from sliding into the first sliding groove and a thrust mechanism capable of pushing the locking rod to the locking piece are arranged in the first sliding hole, and a control mechanism for relieving the tension of the tension mechanism when the platform plate suddenly falls is arranged on the frame body. This application has the effect that improves the lifting support security.

Description

Safety protection system of lifting support

Technical Field

The invention relates to the field of engineering construction equipment, in particular to a safety protection system of a lifting support.

Background

In the engineering construction process, the first procedure in the prestress construction is to perform blanking reeving of the steel strands, and in particular, in the high-speed rail construction process, in order to improve the reeving efficiency of the steel strands, a reeving machine is generally adopted for reeving, so that the construction efficiency is greatly improved. In the use process of the strand pulling machine, in order to enable the strand pulling machine to be capable of pulling steel strands into the strand pulling holes at higher positions, the strand pulling machine is usually fixed on a lifting platform plate of a movable lifting support, and sometimes a worker stands on the platform plate and ascends along with the strand pulling machine to operate the strand pulling machine.

To the above-mentioned related art, the lifting support usually controls the platform board to rise through the pulling rope that one end of the winch is fixed on the platform board, when the platform board reaches a proper height, the motor in the winch stops driving, and the platform board is kept at the height through the self-locking function of the motor, but if the self-locking function of the motor breaks down, the platform board can fall rapidly under the action of gravity, thereby reducing the safety of the lifting support.

Disclosure of Invention

In order to improve lifting support's security, this application provides a lifting support's safety protection system.

The application provides a but lifting support's safety protection system adopts following technical scheme:

the utility model provides a lifting support's safety protection system, is including setting up the locking device on lifting support, lifting support include the frame body with slide set up in landing slab on the frame body with be used for control the hoist mechanism that landing slab goes up and down, the frame body includes vertical pole and installs the transverse bar between two adjacent vertical poles, locking device including install in locking piece on the vertical pole, a plurality of locking groove has been seted up on the locking piece, a plurality of locking groove distributes along vertical direction, install the fixed block on the landing slab, first sliding tray has been seted up on the fixed block, it is provided with the locking lever to slide in the first sliding tray, be provided with in the first sliding hole and obstruct the locking lever to sliding pull mechanism in the first sliding tray with can the thrust mechanism that the locking piece promoted, be provided with on the frame body remove when the landing slab falls suddenly pull force's control mechanism.

Through adopting above-mentioned technical scheme, the locking piece is installed on vertical pole, the fixing base is installed on the landing slab, first sliding tray is seted up on the fixing base, the locking lever slides and sets up in first sliding tray, when the landing slab falls suddenly, control mechanism can contact the pulling force of tension mechanism to the locking lever, make thrust mechanism can promote the locking lever to the direction that is close to the locking piece, thereby make the one end of locking lever insert and locate locking inslot, thereby hinder the landing slab whereabouts, lifting support's security has been improved.

Preferably, the tension mechanism comprises an attraction block fixedly connected to one end of the locking rod away from the locking piece, and one end of the first sliding groove away from the locking piece is fixedly connected with an electromagnet capable of generating attraction force on the attraction block.

Through adopting above-mentioned technical scheme, attract piece fixed connection in the locking lever and keep away from the one end of locking piece, electro-magnet fixed connection is in the one end that the locking piece was kept away from in first sliding tray, and when the electric circuit of electro-magnet was in the conducting state, the electro-magnet can produce the appeal to the piece of attracting to make the locking lever overcome thrust subassembly and slide or keep in first sliding tray to first sliding tray, make the landing slab can normally reciprocate.

Preferably, the control mechanism includes a fixed shaft fixed on the top of the frame body on the transverse rod, a connection pulley rotatably arranged on the frame body, and a control rope arranged on the connection pulley, the fixed shaft is horizontally and rotatably provided with an upper reel, one end of the control rope is fixed on the upper reel, the other end of the control rope is fixed on the platform plate, the upper reel is provided with a rotation block, the rotation block is provided with a second sliding groove, a trigger rod is arranged in the second sliding groove in a sliding manner, the transverse rod is also fixedly connected with a fixed seat, a third sliding groove is arranged on the side surface of the fixed seat close to the upper reel, a control rod is arranged in the third sliding groove in a sliding manner, a fixed contact piece is embedded on the inner wall of the third sliding groove, a movable contact piece connected with the fixed contact piece is embedded on the control rod, one end of the control rod is positioned outside the third sliding groove, an inclined surface is arranged at the end of the control rod, a power source is installed on the fixed seat, the fixed contact piece is electrically connected with one of the electrodes of the power source, the other electrode of the electromagnet is electrically connected with one of the coil in the electromagnet, and the other end of the electromagnet is electrically connected with the electromagnet.

Through adopting the above technical scheme, fixed axle fixed connection is on the transverse bar, it sets up in rotating to go up reel and turning block rotation, the one end of control rope is fixed in on the reel, one end is fixed in on the landing slab, the trigger lever slides and sets up in the second sliding tray, fixing base fixed connection is on the transverse bar and lie in one side of last reel, the control lever slides and sets up in the third sliding tray, when the landing slab falls suddenly, the landing slab can drive the turning block through the reel in the pulling of control rope and rotate fast, make the trigger lever slide outside the second sliding tray under the effect of centrifugal force, when the trigger lever contradicts on the inclined plane of control lever, along with the continuation rotation of turning block, the trigger lever can promote the control lever to the third sliding tray in, thereby make the messenger move the contact piece and break away from the fixed contact piece, and then make the electric circuit of electro-magnet disconnected, make the locking lever can insert the locking groove under thrust mechanism's thrust effect, hinder the landing slab whereabouts.

Preferably, a limiting groove is formed in the inner wall of the second sliding groove, a limiting block is fixedly connected to the trigger rod, and the limiting block is arranged in the limiting groove in a sliding mode.

Through adopting above-mentioned technical scheme, the stopper slides and sets up in the spacing inslot, hinders the trigger bar and breaks away from the second sliding tray, has improved the stability of control mechanism structure.

Preferably, a blocking groove is formed in the inner wall of the third sliding groove, a stop block is fixedly connected to the control rod, and the stop block is arranged in the blocking groove in a sliding mode.

Through adopting above-mentioned technical scheme, the dog slides and sets up in keeping off the inslot, hinders the control lever and breaks away from the third spacing groove, has improved the stability of control mechanism structure.

Preferably, a coil spring is arranged between the fixed shaft and the inner wall of the central hole of the upper coiling wheel, one end of the coil spring is fixedly connected to the fixed shaft, and the other end of the coil spring is fixedly connected to the inner wall of the central hole of the upper coiling wheel.

Through adopting above-mentioned technical scheme, the one end fixed connection of coil spring is on the fixed axle, and the other end fixed connection of coil spring is on the inner wall of last coiling wheel centre bore, and when the landing slab rose, the coil spring can drive the coiling wheel and rotate to make the coiling wheel can be rolled up the control rope, reduced the control rope and taken place winding possibility.

Preferably, the bottom of the fixed shaft is fixedly connected with a baffle, a ball is embedded in the baffle, and the rotating block abuts against the ball.

Through adopting above-mentioned technical scheme, baffle fixed connection is in the bottom of fixed axle, and the ball inlays and locates on the baffle, and the turning block is contradicted on the baffle for the baffle can be hindering turning block and last coiling wheel to break away from the fixed axle, thereby makes turning block and last coiling wheel can more stable rotation set up on the fixed axle.

Preferably, the hoisting mechanism comprises a motor fixedly connected to the bottom of the frame body, a rotating shaft is fixedly connected to an output shaft of the motor, a lower winding wheel is installed on the rotating shaft, the lower winding wheel is located at two ends of the rotating shaft, an upper pulley is installed at four corners of the top of the frame body, a lower pulley is installed at four corners of the bottom of the frame body, a traction rope is fixedly connected to the corners of the platform plate, and the other end of the traction rope is connected to the upper pulley and the lower pulley fixedly connected to the lower winding wheel.

Through adopting above-mentioned technical scheme, the one end fixed connection of haulage rope is on the landing slab, and the other end of haulage rope passes through upper pulley and lower pulley fixed connection on the reel down, and when the motor drive axis of rotation rotated, the reel can be convoluteed the haulage rope on the reel down under, and when the motor antiport, lower reel released haulage rope for the landing slab can the downstream under the action of gravity, thereby realizes the rise and the whereabouts of landing slab.

Preferably, the thrust mechanism comprises a thrust spring, one end of the thrust spring is fixedly connected to the side wall of the first sliding groove far away from the locking piece, and the other end of the thrust spring is fixedly connected to the side face of the locking rod far away from the locking piece.

Through adopting above-mentioned technical scheme, thrust spring's one end is contradicted on the lateral wall that the locking piece was kept away from to first sliding tray, and thrust spring's the other end is contradicted on the locking lever keeps away from the side of locking piece, and when control mechanism removed the pulling force that pulling force mechanism produced to the locking lever, thrust spring's elasticity can promote the locking lever to first sliding tray to the one end that makes the locking lever can be inserted and is located the locking inslot.

Preferably, install the slide rail on the vertical pole, the slider is installed to the corner of landing slab, the slider slide set up in on the slide rail.

Through adopting above-mentioned technical scheme, the slide rail is installed on vertical pole, and the slider is installed in the corner of landing slab, and the slider slides and sets up on the slide rail to make the landing slab can be more stable go up and down on the frame body, improved lifting support operation in-process stability.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the locking piece is arranged on the vertical rod, the fixed seat is arranged on the platform plate, the first sliding groove is formed in the fixed seat, the locking rod is arranged in the first sliding groove in a sliding mode, when the platform plate falls suddenly, the control mechanism can contact with the tension of the tension mechanism on the locking rod, the thrust mechanism can push the locking rod to the direction close to the locking piece, and therefore one end of the locking rod is inserted into the locking groove, the platform plate is prevented from falling, and the safety of the lifting support is improved;

2. the locking rod is fixedly connected with one end of the locking rod, which is far away from the locking piece, the electromagnet is fixedly connected with one end of the first sliding groove, which is far away from the locking piece, and when an electric circuit of the electromagnet is in a conducting state, the electromagnet can generate attraction force on the attraction block, so that the locking rod overcomes the thrust of the thrust assembly to slide towards the first sliding groove or be kept in the first sliding groove, and the platform plate can normally move up and down;

3. fixed axle fixed connection is on the transverse bar, go up the reel and the turning block rotates and sets up in rotating, the one end of control rope is fixed in on the reel, one end is fixed in on the landing slab, the trigger bar slides and sets up in the second sliding tray, fixing base fixed connection is on the transverse bar and lie in one side of last reel, the control lever slides and sets up in the third sliding tray, when the landing slab falls suddenly, the landing slab can drive the turning block through the reel in the control rope pulling and rotate fast, make the trigger bar slide outside the second sliding tray under the effect of centrifugal force, when the trigger bar contradicts on the inclined plane of control lever, along with the continuation rotation of turning block, the trigger bar can promote the control lever to the third sliding tray, thereby make the movable contact piece break away from the fixed contact piece, and then make the electric loop of electro-magnet disconnected, make the locking lever can insert locking inslot under thrust mechanism's thrust action, hinder the landing slab whereabouts.

Drawings

Fig. 1 is a schematic view of the overall structure of a lifting support in the embodiment of the present application.

Fig. 2 is a sectional view of a fixing block in the embodiment of the present application.

Fig. 3 is a partially enlarged view of a portion a in fig. 1.

Fig. 4 is a sectional view of the control mechanism in the embodiment of the present application.

Description of the reference numerals:

1. a lifting support; 11. a frame body; 111. a vertical rod; 112. a transverse bar; 12. a platform plate; 13. a hoisting mechanism; 131. an electric motor; 132. a rotating shaft; 133. rotating the base; 134. a lower winding wheel; 135. an upper pulley; 136. a lower pulley; 137. a hauling rope; 138. mounting a plate; 14. a slide rail; 15. a slider; 2. a locking device; 21. a locking member; 211. a locking groove; 22. a fixed block; 221. a first sliding groove; 23. a locking lever; 24. a thrust mechanism; 241. a thrust spring; 25. a tension mechanism; 251. an attraction block; 252. an electromagnet; 26. a control mechanism; 261. connecting a pulley; 262. a fixed shaft; 263. a baffle plate; 2631. a ball bearing; 264. winding wheel is arranged; 265. rotating the block; 2651. a second sliding groove; 2652. a limiting groove; 2653. a trigger lever; 2654. a limiting block; 266. a fixed seat; 2661. a third sliding groove; 2662. a baffle groove; 2663. a control lever; 26631. a bevel; 2664. a stopper; 2665. a fixed contact piece; 2666. a movable contact spring; 2667. a power source; 267. a coil spring; 27. a control cord.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses safety protection system of liftable support. Referring to fig. 1 and 2, the lifting bracket 1 includes a frame body 11, a deck plate 12, and a winding mechanism 13. The frame body 11 is rectangular frame, and the frame body 11 includes vertical pole 111 and transverse rod 112, and vertical pole 111 is vertical to be provided with four, and transverse rod 112 lies in the level between two adjacent vertical poles 111 and is provided with two, and two transverse rod 112 between two adjacent vertical poles 111 lie in the top and the bottom of vertical pole 111 respectively, and welded fastening is respectively on the vertical pole 111 under the tree of transverse rod 112 both sides at the both ends of transverse rod 112 on.

Referring to fig. 1 and 2, the vertical rod 111 is provided with a slide rail 14, the four corners of the platform plate 12 are provided with slide blocks 15, and the slide blocks 15 are slidably disposed on the slide rail 14.

Referring to fig. 1, the winding mechanism 13 includes a motor 131, a rotating shaft 132, a rotating base 133, a lower wire reel 134, an upper pulley 135, a lower pulley 136, a traction rope 137, and a mounting plate 138. The bottom welded fastening that mounting panel 138 is located frame body 11 has more two, two mounting panels 138 are located two transverse bar 112 that keep away from each other respectively, motor 131 fixed connection is on the top surface of one of them mounting panel 138, rotate on seat 133 welded fastening is on the top surface of another mounting panel 138, axis of rotation 132 coaxial welded fastening is on motor 131's output shaft, the one end that motor 131 was kept away from to axis of rotation 132 is rotated and is set up on rotating seat 133, lower take-up pulley 134 is located axis of rotation 132 and fixed mounting has four, the both ends that lower take-up pulley 134 is located axis of rotation 132 all are provided with two.

Referring to fig. 1 and 3, the upper pulleys 135 are provided in four, and four upper pulleys 135 are respectively installed at four corners of the top of the frame body 11. The lower pulleys 136 are also four, the four lower pulleys 136 are respectively installed at four corners of the bottom of the frame body 11, the four traction ropes 137 are provided, one ends of the four traction ropes 137 are respectively and fixedly connected to the four corners of the platform plate 12, the other ends of the traction ropes 137 are fixedly connected to the lower winding wheel 134 through the upper pulleys 135 and the lower pulleys 136, and the traction ropes 137 are in one-to-one correspondence with the upper pulleys 135, the lower pulleys 136 and the lower winding wheel 134.

Referring to fig. 2 and 4, the safety protection system includes four sets of locking devices 2, the four sets of locking devices 2 are disposed on the frame body 11, and the four sets of locking devices 2 are disposed on four vertical rods 111, respectively. The locking device 2 includes a locking member 21, a fixed block 22, a locking lever 23, a thrust mechanism 24, a tension mechanism 25, and a control mechanism 26. Locking piece 21 is rectangular form, the vertical fixed connection of locking piece 21 is on vertical pole 111, has seted up a plurality of on the locking piece 21 and has locked groove 211, and a plurality of locking groove 211 is along vertical direction evenly distributed, and fixed block 22 welded fastening is in the bottom surface edge of landing slab 12, and first sliding tray 221 has been seted up to the side that fixed block 22 is close to locking piece 21, and locking lever 23 horizontal slip sets up in first sliding tray 221.

Referring to fig. 2, the urging mechanism 24 includes an urging spring 241, one end of the urging spring 241 is fixedly attached to the side wall of the first slide groove 221 away from the locking member 21, and the other end of the urging spring 241 is fixedly attached to the side of the locking lever 23 away from the locking member 21. The tension mechanism 25 includes a suction block 251 and an electromagnet 252. The attraction block 251 is fixedly attached to the end surface of the lock lever 23 remote from the lock member 21, and the electromagnet 252 is fixedly attached to the side wall of the first slide groove 221 remote from the lock member 21.

Referring to fig. 3 and 4, the control mechanism 26 includes a connecting pulley 261, a fixed shaft 262, a baffle 263, an upper reel 264, a rotating block 265, a fixed seat 266, and a coil spring 267. The fixed shaft 262 is vertically and fixedly connected to the top transverse rod 112 of the frame body 11, the connecting pulley 261 is rotatably arranged at the top corner of the frame body 11, the control rope 27 is arranged on the connecting pulley 261, the upper coiling wheel 264 is horizontally and rotatably arranged on the fixed shaft 262, one end of the control rope 27 is fixed on the upper coiling wheel 264, and the other end of the control rope 27 is fixed on the platform plate 12.

Referring to fig. 4, a coil spring 267 is disposed between the fixed shaft 262 and an inner wall of the central hole of the upper reel 264, one end of the coil spring 267 is fixedly coupled to the fixed shaft 262, and the other end of the coil spring 267 is fixedly coupled to the inner wall of the central hole of the upper reel 264.

Referring to fig. 4, the rotating block 265 is welded and fixed to the upper winding wheel 264, a baffle 263 is fixedly connected to the bottom of the fixed shaft 262, the fixed shaft 262 passes through the rotating block 265, the rotating block 265 is rotatably disposed on the fixed shaft 262, a ball 2631 is embedded in the baffle 263, and the rotating block 265 abuts against the ball 2631.

Referring to fig. 4, a second sliding groove 2651 is formed in an outer circumferential surface of the rotating block 265, a trigger rod 2653 is slidably disposed in the second sliding groove 2651, a limiting groove 2652 is formed in an inner wall of the second sliding groove 2651, a length direction of the limiting groove 2652 is parallel to a length direction of the second sliding groove 2651, a limiting block 2654 is fixedly connected to the trigger rod 2653, and the limiting block 2654 is slidably disposed in the limiting groove 2652.

Referring to fig. 4, the fixing seat 266 is also welded and fixed to the transverse rod 112, a third sliding groove 2661 is formed in a side surface of the fixing seat 266 close to the upper reel 264, a control rod 2663 is slidably disposed in the third sliding groove 2661, a blocking groove 2662 is formed in an inner wall of the third sliding groove 2661, a length direction of the blocking groove 2662 is parallel to a length direction of the third sliding groove 2661, a blocking piece 2664 is fixedly connected to the control rod 2663, and the blocking piece 2664 is slidably disposed in the blocking groove 2662.

Referring to fig. 2 and 4, a fixed contact 2665 is embedded in an inner wall of the third sliding slot 2661, a movable contact 2666 is embedded in the control rod 2663 and is connected to the fixed contact 2665, one end of the control rod 2663 is located outside the third sliding slot 2661, an inclined surface 26631 is disposed at an end of the control rod 2663, a power source 2667 is mounted on the fixed seat 266, the fixed contact 2665 is electrically connected to one electrode of the power source 2667, another electrode of the power source 2667 is electrically connected to one end of the coil of the electromagnet 252, and another end of the coil of the electromagnet 252 is electrically connected to the movable contact 2666.

The implementation principle of the safety protection system of the lifting support in the embodiment of the application is as follows: when the platform board 12 suddenly falls, the platform board 12 can pull the upper reel 264 through the control rope 27 to drive the rotation block 265 to rotate quickly, so that the trigger lever 2653 slides out of the second sliding groove 2651 under the action of centrifugal force, when the trigger lever 2653 abuts on the inclined surface 26631 of the control lever 2663, along with the continuous rotation of the rotation block 265, the trigger lever 2653 can push the control lever 2663 into the third sliding groove 2661, so as to make the contact piece 2666 disengage from the fixed contact piece 2665, and further make the electric circuit of the electromagnet 252 be disconnected, so that the locking lever 23 can be inserted into the locking groove 211 under the action of thrust of the thrust spring 241, and the platform board 12 is prevented from falling.

One end fixed connection of haulage rope 137 is on the landing slab 12, and the other end of haulage rope 137 passes through upper pulley 135 and lower pulley 136 fixed connection on lower reel 134, and when motor 131 drive axis of rotation 132 rotated, lower reel 134 can be with haulage rope 137 coiling on lower reel 134, and when motor 131 reverse rotation, lower reel 134 release haulage rope 137 for landing slab 12 can move down under the action of gravity, thereby realizes the rising and the whereabouts of landing slab 12.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a safety protection system of liftable support which characterized in that: comprises a locking device (2) arranged on a lifting support (1), the lifting support (1) comprises a frame body (11), a platform plate (12) arranged on the frame body (11) in a sliding way and a hoisting mechanism (13) used for controlling the platform plate (12) to lift, the frame body (11) comprises vertical rods (111) and transverse rods (112) arranged between two adjacent vertical rods (111), the locking device (2) comprises a locking element (21) mounted on the vertical rod (111), a plurality of locking grooves (211) are arranged on the locking piece (21), the locking grooves (211) are distributed along the vertical direction, a fixed block (22) is arranged on the platform plate (12), a first sliding groove (221) is arranged on the fixed block (22), a locking rod (23) is arranged in the first sliding groove (221) in a sliding way, a tension mechanism (25) which hinders the locking rod (23) from sliding towards the first sliding groove (221) and a thrust mechanism (24) which can push the locking rod (23) towards the locking piece (21) are arranged in the first sliding hole, and the frame body (11) is provided with a control mechanism (26) for releasing the pulling force of the pulling mechanism (25) when the platform plate (12) falls down suddenly.

2. The safety protection system of a liftable support according to claim 1, characterized in that: the pulling mechanism (25) comprises a suction block (251) fixedly connected to one end, far away from the locking piece (21), of the locking rod (23), and an electromagnet (252) capable of generating suction force on the suction block (251) is fixedly connected to one end, far away from the locking piece (21), of the first sliding groove (221).

3. The safety protection system of a liftable support according to claim 2, characterized in that: the control mechanism (26) comprises a fixed shaft (262) fixed on the transverse rod (112) at the top of the frame body (11), a connecting pulley (261) rotatably arranged on the frame body (11) and a control rope (27) arranged on the connecting pulley (261), the fixed shaft (262) is horizontally and rotatably provided with an upper coiling wheel (264), one end of the control rope (27) is fixed on the upper coiling wheel (264), the other end of the control rope (27) is fixed on the platform plate (12), a rotating block (265) is installed on the upper coiling wheel (264), a second sliding groove (2651) is formed in the rotating block (265), a trigger rod (2653) is arranged in the second sliding groove (2651) in a sliding manner, a fixed seat (266) is further fixedly connected to the transverse rod (112), a third sliding groove (2661) is formed in the side surface of the fixed seat (266) close to the upper coiling wheel (264), a control rod (2663) is arranged in the third sliding groove (2661), a contact piece (2665) is arranged on the inner wall of the third sliding groove (2661), and a control rod (2666) is arranged at the position of the control rod (2663), and a positioning rod (2663) is arranged at the position of the control rod (2666), an inclined plane (26631) is arranged at the end part of the control rod (2663), a power supply (2667) is installed on the fixed seat (266), the fixed contact piece (2665) is electrically connected with one electrode of the power supply (2667), the other electrode of the power supply (2667) is electrically connected with one end of a coil in the electromagnet (252), and the other end of the coil in the electromagnet (252) is electrically connected with the movable contact piece (2666).

4. The safety protection system of a liftable support according to claim 3, characterized in that: a limiting groove (2652) is formed in the inner wall of the second sliding groove (2651), a limiting block (2654) is fixedly connected to the trigger rod (2653), and the limiting block (2654) is arranged in the limiting groove (2652) in a sliding mode.

5. The safety protection system of a liftable support according to claim 3, characterized in that: a blocking groove (2662) is formed in the inner wall of the third sliding groove (2661), a stop block (2664) is fixedly connected to the control rod (2663), and the stop block (2664) is arranged in the blocking groove (2662) in a sliding mode.

6. The safety protection system of a liftable support according to claim 3, characterized in that: a coil spring (267) is arranged between the fixed shaft (262) and the inner wall of the central hole of the upper coiling wheel (264), one end of the coil spring (267) is fixedly connected to the fixed shaft (262), and the other end of the coil spring (267) is fixedly connected to the inner wall of the central hole of the upper coiling wheel (264).

7. The safety protection system of a liftable support according to claim 3, characterized in that: the bottom fixedly connected with baffle (263) of fixed axle (262), inlay on baffle (263) and be equipped with ball (2631), turning block (265) are contradicted on ball (2631).

8. The safety protection system of a liftable support according to claim 1, characterized in that: hoist mechanism (13) including fixed connection in motor (131) of frame body (11) bottom, fixedly connected with axis of rotation (132) on the output shaft of motor (131), install down reel (134) on axis of rotation (132), down reel (134) are located the both ends of axis of rotation (132) all are provided with two, pulley (135) are all installed to four corners at the top of frame body (11), pulley (136) down are all installed to four corners of the bottom of frame body (11), corner fixedly connected with haulage rope (137) of landing slab (12), the other end of haulage rope (137) passes through go up pulley (135) with down pulley (136) fixed connection in on lower reel (134).

9. The safety protection system of a liftable support according to claim 1, characterized in that: the thrust mechanism (24) comprises a thrust spring (241), one end of the thrust spring (241) is fixedly connected to the side wall, away from the locking piece (21), of the first sliding groove (221), and the other end of the thrust spring (241) is fixedly connected to the side face, away from the locking piece (21), of the locking rod (23).

10. The safety protection system of a liftable support according to claim 1, characterized in that: install slide rail (14) on vertical pole (111), slider (15) are installed to the corner of landing slab (12), slider (15) slide set up in on slide rail (14).