Safety bridge crane with anti-collision roof

Abstract

The application relates to the technical field of hoisting equipment, in particular to a safety bridge crane capable of preventing the crane from colliding with the top. The crane comprises a hook frame, a measuring mechanism arranged on the hook frame, the measuring mechanism comprising a mounting disc fixedly arranged on the hook frame, a rotating disc rotatably arranged on the mounting disc, a pair of guide blocks slidably arranged on the rotating disc, a scissor frame arranged on the pair of guide blocks and a telescopic rod arranged on the mounting disc and having a telescopic end fixedly penetrating through the scissor frame. The measuring mechanism can measure the maximum height of goods, the telescopic end of the telescopic rod can be extended according to the maximum height of the goods, and when the crane hoists the goods, the lifting mechanism can be timely disconnected from power transmission according to the measurement result of the measuring mechanism, so that the collision accident of the crane with the top can be effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hoisting equipment, and particularly relates to a safety bridge crane capable of preventing top collision. BACKGROUND

[0002] The bridge crane has the characteristics of compact structure, stable operation and low noise, can adapt to various harsh environments, and can be widely applied to the fields of mining, construction, port and logistics.

[0003] In the prior art, in order to prevent the top collision accident, the position of the hook is monitored by a limiting device or other means, and when the hook is close to the lifting component, the lifting component can be controlled to stop running in time. This method can only prevent the collision accident of the hook and the lifting component, and when a part of the hoisted goods is higher than the hook, the above method is no longer applicable. In this case, the height of the highest point of the goods needs to be measured, and the lifting height limit position of the hook needs to be adjusted according to the measurement result, otherwise the collision between the goods and the cross beam of the crane will occur, resulting in the top collision accident. SUMMARY

[0004] In order to overcome the defects in the prior art, the present application provides a safety bridge crane capable of preventing top collision.

[0005] The technical implementation scheme of the present application is as follows: a safety bridge crane capable of preventing top collision comprises a hook frame.

[0006] A measuring mechanism is arranged on the hook frame, and the measuring mechanism comprises:

[0007] A mounting disc is fixedly installed on the hook frame.

[0008] A rotating disc is rotatably arranged on the mounting disc, and the rotating disc and the mounting disc are jointly inserted with a latch.

[0009] A pair of guide blocks are slidably installed on the rotating disc.

[0010] A scissor frame is installed on the pair of guide blocks.

[0011] A telescopic rod is arranged on the mounting disc, and the telescopic end of the telescopic rod is fixedly penetrated through the scissor frame.

[0012] A lifting mechanism is arranged on the upper side of the mounting disc, and the measuring mechanism can control the power transmission of the lifting mechanism.

[0013] Further, the measuring mechanism further comprises a T-shaped plate, the top of the rotating disc is slidably provided with the T-shaped plate, the T-shaped plate is connected with the two guide blocks through a pull rope respectively, the top of the rotating disc is provided with two guide wheels for guiding the pull rope, the rotating disc is rotatably provided with a take-up reel, and the take-up reel is provided with the speed reducer, one end of a steel cable connected with the T-shaped plate is wound around the take-up reel, one end of the wheel shaft of the take-up reel is connected with the output end of the speed reducer, and the rotating disc is rotatably provided with an elastic wire box, and one end of the rotating shaft of the elastic wire box is connected with the input end of the speed reducer.

[0014] Further, the measuring mechanism further comprises a rotating frame, the top of the rotating disc is hingedly provided with the rotating frame through a support plate, the rotating frame is fixedly provided with a sleeve pipe sleeved outside the wire bundle of the elastic wire box, and the rotating frame is fixedly provided with an indicating rod.

[0015] Further, the measuring mechanism further comprises a bidirectional screw rod, the top of the rotating disc is provided with the bidirectional screw rod, and the bidirectional screw rod is threadedly connected with a pair of push blocks matched with the guide blocks.

[0016] Further, the measuring mechanism further comprises an air valve, and the outer wall of the telescopic rod is communicated with the air valve.

[0017] Further, the lifting mechanism comprises a push rod, the telescopic end of the telescopic rod is elastically hingedly provided with the push rod, the upper side of the push rod is provided with a speed reducer, the output end of the speed reducer is fixedly provided with a spline sleeve, the spline sleeve is elastically slidably provided with a spline shaft, the outer wall of the spline shaft is rotatably sleeved with a sleeve plate matched with the push rod, one side of the spline shaft is provided with a winding drum, and one end of the winding drum is provided with a spline groove matched with the spline shaft.

[0018] Further, the lifting mechanism further comprises an elastic wedge block, the spline sleeve is slidably provided with the elastic wedge block, and the outer wall of the spline shaft is provided with a locking groove matched with the elastic wedge block.

[0019] Further, the lifting mechanism further comprises a limiting mechanism, the limiting mechanism comprises the gear, the gear is fixedly sleeved with the winding drum, one side of the gear is provided with a hydraulic rod, and the telescopic end of the hydraulic rod is fixedly provided with a rack matched with the gear.

[0020] Further, the unlocking mechanism is further included, the unlocking mechanism includes a ring, the spline sleeve is sleeved with the ring, the ring is connected with the speed reducer through a support rod, a groove is formed in the ring, a sliding block is slidably installed in the groove, a unlocking block is installed on the top of the sliding block through an elastic expansion shaft, the unlocking block is movably connected with the inner wall of the groove of the ring, a convex shaft matched with the unlocking block is fixedly installed on one side of the elastic wedge-shaped block, and a vertical slot for the convex shaft to move is formed in one side of the spline sleeve.

[0021] Further, the unlocking mechanism is further included, the unlocking mechanism includes a ring, the spline sleeve is sleeved with the ring, the ring is connected with the speed reducer through a support rod, a groove is formed in the ring, a sliding block is slidably installed in the groove, a unlocking block is installed on the top of the sliding block through an elastic expansion shaft, the unlocking block is movably connected with the inner wall of the groove of the ring, a convex shaft matched with the unlocking block is fixedly installed on one side of the elastic wedge-shaped block, and a vertical slot for the convex shaft to move is formed in one side of the spline sleeve.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1、The present application can measure the highest point of the goods through the design of the measuring mechanism, the telescopic end of the telescopic rod can be extended according to the highest point of the goods, and the lifting mechanism can be disconnected in time according to the measurement result of the measuring mechanism when the crane hoists the goods, so that the collision accident can be effectively prevented.

[0024] 2、The present application can extrude the inner wall of the sleeve by the wire harness in the elastic wire box when the wire harness in the elastic wire box is pulled out, so that the rotating frame drives the indicating rod to move, the angle of the indicating rod is observed by the staff, the two-way lead screw is rotated according to the angle of the indicating rod, the telescopic end of the telescopic rod is extended again, and the measurement accuracy of the measuring mechanism is further improved.

[0025] 3、The present application can not limit the unlocking block by the limiting block when the goods are hoisted, the unlocking block can be completely slid into the groove of the ring after being extruded by the convex shaft on the elastic wedge-shaped block, the limiting block can limit the unlocking block when the goods are lowered, so that the elastic wedge-shaped block is separated from the locking groove on the spline shaft, the spline shaft can be automatically clamped into the spline groove of the winding drum, and the power transmission of the lifting mechanism is restored. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the whole application;

[0027] Figure 2 It is a structural schematic diagram of the measuring mechanism of the application;

[0028] Figure 3 It is an installation schematic diagram of the guide block;

[0029] Figure 4 It is an installation schematic diagram of the speed reducer of the application;

[0030] Figure 5 The installation schematic diagram at the rotating frame of the present application;

[0031] Figure 6 The installation schematic diagram at the bidirectional screw of the present application;

[0032] Figure 7 The structure schematic diagram of the lifting mechanism of the present application;

[0033] Figure 8 The installation schematic diagram at the sleeve plate of the present application;

[0034] Figure 9 The installation schematic diagram at the elastic wedge block of the present application;

[0035] Figure 10 The installation schematic diagram at the rack of the present application;

[0036] Figure 11 The structure schematic diagram at the circular ring of the present application;

[0037] Figure 12 The structure schematic diagram at the unlocking block of the present application.

[0038] In the drawings: 1, hook frame, 201, mounting disc, 202, rotating disc, 203, guide block, 204, scissor frame, 205, telescopic rod, 301, T-shaped plate, 302, take-up wheel, 303, speed reducer box, 304, elastic wire box, 305, rotating frame, 306, sleeve, 307, indicating rod, 308, bidirectional screw, 309, push block, 401, air valve, 501, push rod, 502, speed reducer, 503, spline sleeve, 504, spline shaft, 505, sleeve plate, 506, winding drum, 601, elastic wedge block, 701, gear, 702, hydraulic rod, 703, rack, 801, circular ring, 802, sliding block, 803, unlocking block, 901, limiting block. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application is further described in detail below in combination with specific embodiments and with reference to the drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0040] Example 1

[0041] A safety type bridge crane with anti-collision top, such as Figures 1-3As shown, the system includes a hook frame 1, on which a measuring mechanism for measuring the highest point of a cargo is installed. The measuring mechanism includes a mounting plate 201 fixedly mounted on the hook frame 1, a rotating plate 202 rotatably mounted on the top of the mounting plate 201, and a pin inserted into both the rotating plate 202 and the mounting plate 201. A pair of guide blocks 203 are slidably mounted on the top of the rotating plate 202, and a scissor lift 204 is mounted on both guide blocks 203. A telescopic rod 205 is fixedly mounted on the top of the mounting plate 201, and the telescopic end of the telescopic rod 205 is fixedly inserted through the scissor lift 204. A lifting mechanism is provided on the upper side of the mounting plate 201. When the highest point of the cargo is close to the crossbeam of the crane, the measuring mechanism can disconnect the power transmission of the lifting mechanism.

[0042] like Figures 3-5 As shown, the measuring mechanism also includes a T-shaped plate 301. The T-shaped plate 301 is horizontally slidably mounted on the top of the rotating disk 202. Pull ropes are connected between the T-shaped plate 301 and the two guide blocks 203 respectively. Two guide wheels for guiding the pull ropes are mounted on the top of the rotating disk 202. The pull ropes are wound around the guide wheels. A take-up reel 302 located behind the T-shaped plate 301 is rotatably mounted on the rotating disk 202, and a reduction gearbox 303 is also mounted thereon. One end of a steel cable is connected to the rear side of the T-shaped plate 301. The other end of the steel cable is wound around the take-up reel 302. One end of the axle of the take-up reel 302 is connected to the output end of the reduction gearbox 303. An elastic wire box 304 located behind the take-up reel 302 is rotatably mounted on the rotating disk 202. One end of the shaft of the elastic wire box 304 is connected to the input end of the reduction gearbox 303.

[0043] like Figure 4 and Figure 5 As shown, the measuring mechanism also includes a rotating frame 305. The top of the rotating disk 202 is hinged to the rotating frame 305 via a support plate. A ratchet structure is provided between the rotating frame 305 and the support plate. The ratchet structure is used to limit the rotation frame 305 (the ratchet structure is existing technology and will not be described in detail). The rotating frame 305 is located on the rear side of the flexible wire box 304. A sleeve 306 is fixedly installed on the right side of the rotating frame 305, which is sleeved on the outside of the wire harness of the flexible wire box 304. An indicator rod 307 is fixedly installed on the rotating frame 305. The support plate is engraved with a scale for comparison with the indicator rod 307.

[0044] like Figure 6 As shown, the measuring mechanism also includes a bidirectional lead screw 308. The bidirectional lead screw 308 is rotatably mounted on the top of the rotating disk 202. A pair of push blocks 309 that cooperate with the guide blocks 203 are threadedly connected to the bidirectional lead screw 308. When the bidirectional lead screw 308 rotates, the two push blocks 309 can push the two guide blocks 203 respectively.

[0045] like Figure 3As shown, the measuring mechanism further comprises an air valve 401, the outer wall of the telescopic rod 205 is communicated with the air valve 401, and the air valve 401 is used to control the air amount in the inner cavity of the telescopic rod 205.

[0046] Initially, the pin is disengaged from the mounting disc 201 and the rotating disc 202, and the telescopic end of the telescopic rod 205 is in a retracted state. First, the cargo is hoisted by the hook of the crane, and the steel wire rope between the hook frame 1 and the crane is taut, and the cargo remains in contact with the ground. When a part of the cargo is higher than the hook, since the position of the highest point of the cargo is uncertain, the position of the highest point of the cargo needs to be calibrated. A worker pulls the handle on the wire bundle of the elastic wire box 304, drives the rotating disc 202 to rotate through the handle on the wire bundle of the elastic wire box 304, and finally aligns the highest point of the cargo, the elastic wire box 304, and the telescopic rod 205 in the horizontal direction. At this time, continue to pull the handle on the wire bundle of the elastic wire box 304 to pull out the wire bundle in the elastic wire box 304. The rotating shaft of the elastic wire box 304 drives the take-up reel 302 to rotate slowly through the speed reducer 303. The take-up reel 302 pulls the T-shaped plate 301 to slide through the steel cable. The T-shaped plate 301 pulls the two guide blocks 203 to slide close to each other through the two pull ropes. The scissors frame 204 extends upward under the action of the two guide blocks 203. The telescopic end of the telescopic rod 205 extends upward under the action of the scissors frame 204. The external air enters the inner cavity of the telescopic rod 205 through the air valve 401. Until the handle on the wire bundle of the elastic wire box 304 moves to the highest point of the cargo, then the handle on the wire bundle of the elastic wire box 304 is not pulled any more. The wire bundle of the elastic wire box 304 is wound elastically. The rotating shaft of the elastic wire box 304 drives the take-up reel 302 to rotate slowly through the speed reducer 303. The steel cable between the take-up reel 302 and the T-shaped plate 301 is loosened. The pull rope between the T-shaped plate 301 and the guide block 203 is loosened. At this time, the T-shaped plate 301 cannot be reset, and the air in the inner cavity of the telescopic rod 205 cannot be discharged through the air valve 401, so that the telescopic end of the telescopic rod 205 cannot be retracted. Thus, when the wire bundle of the elastic wire box 304 is wound, the telescopic end of the telescopic rod 205 is prevented from resetting.

[0047] At the beginning, the two push blocks 309 are in contact with the two guide blocks 203, when the two guide blocks 203 slide close to each other, the two guide blocks 203 are no longer in contact with the two push blocks 309, because the highest point of each cargo is different, and the horizontal distance between the highest point and the elastic wire box 304 is different, the extension distance of the extension end of the telescopic rod 205 needs to be accurately adjusted according to the height and position of the highest point of different cargos, when the wire bundle of the elastic wire box 304 is pulled out, the wire bundle of the elastic wire box 304 extrudes the inner wall of the sleeve 306, the sleeve 306 is forced to drive the rotating frame 305 to rotate upwards, the rotating frame 305 drives the indicator rod 307 to move, when the wire bundle of the elastic wire box 304 is reeled, the ratchet structure between the rotating frame 305 and the support plate limits the rotating frame 305, so that the rotating frame 305 cannot reset, thereby the position of the indicator rod 307 remains stable, then the staff observes the scale on the support plate and the indicator rod 307, rotates the two-way screw 308 by a corresponding angle, the two push blocks 309 move close to each other under the action of the two-way screw 308, then the two push blocks 309 are in contact with the two guide blocks 203 respectively, and push the two guide blocks 203 to move close to each other, thereby the extension end of the telescopic rod 205 is extended again, when the horizontal distance between the highest point of the cargo and the elastic wire box 304 is close, the rotation angle of the indicator rod 307 is large, thereby the extension distance of the extension end of the telescopic rod 205 is longer, when the horizontal distance between the highest point of the cargo and the elastic wire box 304 is far, the rotation angle of the indicator rod 307 is small, thereby the extension distance of the extension end of the telescopic rod 205 is shorter.

[0048] After the above steps are completed, the rotating disc 202 is rotated to reset, and the latch is inserted into the mounting disc 201 and the rotating disc 202.

[0049] Example 2

[0050] As shown in Figures 6-8 , the lifting mechanism comprises a push rod 501, the extension end of the telescopic rod 205 is elastically connected with the push rod 501, the upper side of the push rod 501 is provided with a speed reducer 502, the speed reducer 502 is fixedly installed on the walking trolley of the crane, the output end of the speed reducer 502 is fixedly installed with a spline sleeve 503, the spline sleeve 503 is elastically and slidably installed with a spline shaft 504, the outer wall of the spline shaft 504 is rotatably provided with a sleeve plate 505 matched with the push rod 501, when the push rod 501 is in contact with the sleeve plate 505, the spline shaft 504 can slide to the side close to the speed reducer 502, the front side of the spline shaft 504 is provided with a winding drum 506, the winding drum 506 is rotatably installed on the walking trolley of the crane, the rear end of the winding drum 506 is provided with a spline groove matched with the spline shaft 504.

[0051] As shown in Figure 9As shown, the lifting mechanism also includes an elastic wedge block 601. The elastic wedge block 601 is slidably installed inside the spline sleeve 503. The outer wall of the spline shaft 504 has a locking groove that cooperates with the elastic wedge block 601. When the elastic wedge block 601 is inserted into the locking groove, it can limit the spline shaft 504.

[0052] like Figure 10 As shown, it also includes a limiting mechanism, which includes a gear 701. The gear 701 is fixedly sleeved at the rear end of the drum 506. A hydraulic rod 702 is provided on the right side of the gear 701. The hydraulic rod 702 is fixedly installed on the traveling trolley of the crane. A rack 703 that meshes with the gear 701 is fixedly installed at the telescopic end of the hydraulic rod 702. When the rack 703 meshes with the gear 701, it can limit the drum 506 and prevent the drum 506 from rotating freely.

[0053] like Figure 11 and Figure 12 As shown, it also includes an unlocking mechanism, which includes a ring 801. The outer wall of the spline sleeve 503 is rotatably fitted with the ring 801. The ring 801 is fixed to the reducer 502 by a support rod. The outer wall of the ring 801 has a groove. A slider 802 is slidably installed in the groove. The top of the slider 802 is installed with an unlocking block 803 through an elastic telescopic shaft. The unlocking block 803 is movably connected to the inner wall of the groove. A convex shaft that cooperates with the unlocking block 803 is fixedly installed on the rear side of the elastic wedge block 601. A vertical groove for the convex shaft to move is opened through the rear side of the spline sleeve 503.

[0054] like Figure 12 As shown, it also includes a limiting block 901. The limiting block 901 is fixedly installed in the groove of the ring 801. The unlocking block 803 has a slot on one side that cooperates with the limiting block 901. When the limiting block 901 is in contact with the slot of the unlocking block 803, it can limit the unlocking block 803.

[0055] At the beginning, the limiting block 901 is not clamped into the clamping groove of the unlocking block 803, the spline shaft 504 is inserted into the spline groove of the winding drum 506, and when the extension end of the telescopic rod 205 is extended, the push rod 501 is lifted upward, and when the telescopic rod 205 is extended for the second time, the position of the push rod 501 is higher than the highest point of the goods. The crane is controlled to operate, so that the output end of the speed reducer 502 drives the spline sleeve 503 to drive the spline shaft 504 to rotate counterclockwise, the spline shaft 504 drives the winding drum 506 to rotate, the lifting hook lifts the goods, the lifting hook frame 1 drives the rotating disc 202 to lift upward through the mounting disc 201, the rotating disc 202 drives the push rod 501 to lift upward through the telescopic rod 205, and the elastic wedge block 601 is driven to move by the spline sleeve 503. Then the convex shaft on the elastic wedge block 601 contacts and extrudes the right side slope of the unlocking block 803. At this time, the elastic force of the elastic telescopic shaft is smaller than the elastic force of the elastic wedge block 601, the telescopic end of the elastic telescopic shaft is retracted under the drive of the unlocking block 803, the unlocking block 803 is completely slid into the groove of the circular ring 801, then the convex shaft passes the unlocking block 803 and no longer contacts it, the telescopic end of the elastic telescopic shaft releases and drives the unlocking block 803 to slide and reset, and then the above steps are repeated until the push rod 501 contacts the front side of the sleeve plate 505. The push rod 501 is elastically retracted and rotated and extrudes the sleeve plate 505, the sleeve plate 505 is driven to slide the spline shaft 504 to the side close to the speed reducer 502, then the extension end of the hydraulic rod 702 is extended, the extension end of the hydraulic rod 702 drives the rack 703 to move, and the rack 703 is engaged with the rack 703. At this time, the winding drum 506 still rotates, the movement speed of the gear 701 after being engaged with the rack 703 is the same as the movement speed of the speed reducer 502, and the gear 701 and the rack 703 will not produce misalignment movement. Then the locking slot of the spline shaft 504 is aligned with the elastic wedge block 601, the elastic wedge block 601 is released and slid into the locking slot of the spline shaft 504 to limit the spline shaft 504, and when the spline shaft 504 is separated from the spline groove of the winding drum 506, the rack 703 can limit the winding drum 506 by being engaged with the gear 701. Thus, the power transmission of the lifting mechanism can be cut off, the goods can be prevented from contacting the cross beam of the crane to cause a collision accident, the goods can be prevented from falling when the power transmission of the lifting mechanism is cut off, and there is still a gap between the highest point of the goods and the cross beam of the crane. Thus, the goods can be effectively prevented from swinging during lifting and causing a collision accident.

[0056] When the goods need to be put down, the crane is controlled to operate, the output end of the speed reducer 502 drives the spline shaft 504 to rotate clockwise through the spline sleeve 503, the spline sleeve 503 drives the elastic wedge block 601 to move, then the convex shaft on the elastic wedge block 601 is in contact with and extrudes the left side of the unlocking block 803, the unlocking block 803 is forced to drive the sliding block 802 to slide in the groove of the ring 801 through the elastic extension shaft, then the clamping groove of the unlocking block 803 is in contact with the limiting block 901, the sliding block 802 is in contact with the end of the groove, the unlocking block 803 is in contact with the end of the groove, the limiting block 901 limits the unlocking block 803 through the clamping groove of the unlocking block 803, so that the unlocking block 803 can extrude the convex shaft on the elastic wedge block 601, the convex shaft is forced to drive the elastic wedge block 601 to contract and slide, the elastic wedge block 601 slides out of the locking groove on the spline shaft 504, the spline shaft 504 elastically slides back to the original position, at the same time, the extension end of the hydraulic rod 702 is controlled to contract, the extension end of the hydraulic rod 702 drives the rack 703 to move, the gear 701 drives the drum 506 to rotate under the action of the rack 703, so as to make the hook drive the goods to fall, it is worth noting that the movement speed of the gear 701 after meshing with the rack 703 is the same as the movement speed of the speed reducer 502, when the spline shaft 504 elastically slides, the spline shaft 504 is aligned with the spline groove of the drum 506, so that the spline shaft 504 can be smoothly clamped into the spline groove of the drum 506, the power transmission of the lifting mechanism is restored, at the same time, the rack 703 is separated from the gear 701, the extension end of the hydraulic rod 702 continues to contract to drive the rack 703 to reset, the output end of the speed reducer 502 continues to drive the spline shaft 504 to rotate clockwise through the spline sleeve 503, so as to make the hook drive the goods to fall, the hook frame 1 drives the rotating disc 202 to fall through the mounting disc 201, the rotating disc 202 drives the push rod 501 to fall through the extension rod 205, the push rod 501 gradually elastically rotates back to the original position and no longer contacts the sleeve plate 505 when falling, after the goods are put down, the bidirectional screw rod 308 is rotated, the two push blocks 309 move away from each other under the action of the bidirectional screw rod 308 to reset, then the air valve 401 is opened, the air in the inner cavity of the extension rod 205 is discharged through the air valve 401, the extension end of the extension rod 205 is contracted and reset under the action of the weight, and drives the scissor frame 204 and the push rod 501 to reset.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the protection scope of the present application, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A safety bridge crane with anti-crown, characterized in that: The hook frame (1) is included. The measuring mechanism is arranged on the hook frame (1), and the measuring mechanism comprises: The mounting disc (201) is fixedly installed on the hook frame (1); The rotating disc (202) is rotatably arranged on the mounting disc (201), and the rotating disc (202) and the mounting disc (201) are jointly inserted with the latch; The guide block (203) is slidably installed on the rotating disc (202); The scissor frame (204) is installed on the pair of guide blocks (203); The telescopic rod (205) is arranged on the mounting disc (201), and the telescopic end is fixedly penetrated through the scissor frame (204); The lifting mechanism is arranged on the upper side of the mounting disc (201), and the measuring mechanism can control the power transmission of the lifting mechanism; The measuring mechanism further comprises a T-shaped plate (301), the T-shaped plate (301) is slidably installed on the top of the rotating disc (202), the T-shaped plate (301) is connected with the two guide blocks (203) through the pull rope respectively, two guide pulleys for the pull rope are installed on the top of the rotating disc (202), a take-up reel (302) is rotatably installed on the rotating disc (202), and a speed reducer (303) is installed; one end of the steel cable connected with the T-shaped plate (301) is wound on the take-up reel (302), one end of the axle of the take-up reel (302) is connected with the output end of the speed reducer (303), and an elastic wire box (304) is rotatably installed on the rotating disc (202); one end of the rotating shaft of the elastic wire box (304) is connected with the input end of the speed reducer (303); The measuring mechanism further comprises a rotating frame (305), the rotating frame (305) is hingedly connected to the top of the rotating disc (202) through a support plate, a sleeve (306) is fixedly installed on the rotating frame (305) and sleeved outside the wire bundle of the elastic wire box (304), and an indicating rod (307) is fixedly installed on the rotating frame (305); The lifting mechanism comprises a push rod (501), the telescopic end of the telescopic rod (205) is elastically hinged with the push rod (501), a speed reducer (502) is arranged on the upper side of the push rod (501), a spline sleeve (503) is fixedly installed on the output end of the speed reducer (502), a spline shaft (504) is elastically slidably installed in the spline sleeve (503), a sleeve plate (505) matched with the push rod (501) is rotatably sleeved on the outer wall of the spline shaft (504), a winding drum (506) is arranged on one side of the spline shaft (504), and a spline groove matched with the spline shaft (504) is formed in one end of the winding drum (506). The lifting mechanism further comprises an elastic wedge block (601), the elastic wedge block (601) is slidably arranged in the spline sleeve (503), and the outer wall of the spline shaft (504) is provided with a locking groove matched with the elastic wedge block (601).

2. A safety bridge crane with anti- ceiling collision according to claim 1, characterized in that: The measuring mechanism further comprises a bidirectional screw (308), the top of the rotating disc (202) is provided with the bidirectional screw (308), and a pair of push blocks (309) matched with the guide block (203) are threadedly connected to the bidirectional screw (308).

3. A safety bridge crane with anti- ceiling collision according to claim 2, characterized in that: The measuring mechanism further comprises an air valve (401), and the outer wall of the telescopic rod (205) is communicated with the air valve (401).

4. A safety bridge crane with anti- ceiling according to claim 1, characterized in that: The limiting mechanism comprises a gear (701), one end of the winding drum (506) is fixedly provided with the gear (701), one side of the gear (701) is provided with a hydraulic rod (702), and the telescopic end of the hydraulic rod (702) is fixedly provided with a rack (703) matched with the gear (701).

5. A safety bridge crane with anti- ceiling according to claim 1, characterized in that: The unlocking mechanism comprises a ring (801), the spline sleeve (503) is rotatably provided with the ring (801), the ring (801) is connected with the speed reducer (502) through a support rod, the ring (801) is provided with a groove, a sliding block (802) is slidably arranged in the groove, an unlocking block (803) is arranged on the top of the sliding block (802) through an elastic telescopic shaft, the unlocking block (803) is movably connected with the inner wall of the groove of the ring (801), one side of the elastic wedge block (601) is fixedly provided with a convex shaft matched with the unlocking block (803), and a vertical groove is formed in one side of the spline sleeve (503) and used for the movement of the convex shaft.

6. A safety bridge crane with anti- ceiling according to claim 5, characterized in that: The limiting block (901) is fixedly arranged in the groove of the ring (801), and a clamping groove matched with the limiting block (901) is formed in one side of the unlocking block (803).

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