阅读说明：本技术 一种起重机用负载监控设备 (Load monitoring equipment for crane ) 是由 徐建明 孔常剑 张新霞 潘小敏 陈岚 解雅梅 于 2021-09-03 设计创作，主要内容包括：本发明涉及起重机技术领域,且公开了一种起重机用负载监控设备,包括两个支撑梁,两个支撑梁的上表面设置有横梁架,所述横梁架上表面设置有移动结构,所述移动结构下表面传动连接有滚轮模组,所述横梁架和移动结构之间设置有平衡组件,两个所述支撑梁互相靠近的一侧均设置有支撑组件。设置负载监控组件,当挂钩将物品吊起时,活动板对称重传感器造成压力,称重传感器被压时可以对受到的压力进行称量,从而达到监控物品质量的效果,当受到的压力大于起重机规定的承压时,称重传感器将电信号传输给中间继电器,中间继电器接通警报灯的电源,使警报灯工作,警报灯工作发出警报,提示操作人员超重的问题,避免了物品超重造成安全事故的问题。(The invention relates to the technical field of cranes and discloses load monitoring equipment for a crane, which comprises two supporting beams, wherein a cross beam frame is arranged on the upper surfaces of the two supporting beams, a moving structure is arranged on the upper surface of the cross beam frame, a roller module is connected to the lower surface of the moving structure in a transmission manner, a balancing component is arranged between the cross beam frame and the moving structure, and a supporting component is arranged on one side, close to each other, of each supporting beam. Set up load monitoring subassembly, when the couple hoists article, fly leaf weighing transducer causes pressure, weighing transducer can weigh the pressure that receives when being pressed, thereby reach the effect of control article quality, when the pressure that receives is greater than the pressure-bearing of hoist regulation, weighing transducer gives relay with signal of telecommunication transmission, relay switches on the power of warning light, make the warning light work, warning light work sends out the police dispatch newspaper, the overweight problem of suggestion operating personnel, the overweight problem that causes the incident of article has been avoided.)

1. The utility model provides a load monitoring equipment for hoist, includes two supporting beam (3), and the upper surface of two supporting beam (3) is provided with crossbeam frame (1), crossbeam frame (1) upper surface is provided with and removes structure (6), it is connected with gyro wheel module (15), its characterized in that to remove structure (6) lower surface transmission: be provided with balanced subassembly between crossbeam frame (1) and removal structure (6), two one side that supporting beam (3) are close to each other all is provided with supporting component, supporting component's position corresponds with the position of crossbeam frame (1), the lower surface of gyro wheel module (15) is provided with load monitoring subassembly.

2. The load monitoring apparatus for a crane according to claim 1, wherein: the balance assembly comprises a slide rail frame (2), a plurality of movable pipes (10) are arranged on the lower surface of the slide rail frame (2), corresponding holes are arranged on the upper surface of the cross beam frame (1) and at the corresponding positions of each movable tube (10), the lower surface of the cross beam frame (1) is provided with two bottom grooves (25), the bottom end of the movable tube (10) extends to the inner side of the bottom grooves (25) through corresponding holes, a fixed rod (12) is fixedly arranged on the inner side of the bottom groove (25), an upright post (26) is fixedly arranged on the upper surface of the fixed rod (12) and at the corresponding position of each movable tube (10), the top end of the upright post (26) extends to the inner side of the movable tube (10), the bottom end of the movable tube (10) is provided with a pressing ring (27), and a buffer spring (33) is movably sleeved outside the upright post (26) and between the pressing ring (27) and the fixed rod (12).

3. The load monitoring apparatus for a crane according to claim 2, wherein: the supporting component comprises a square block (9), the square block (9) is fixedly installed on one side of a supporting beam (3), a bottom convex block (22) is fixedly installed on the lower surface of the square block (9), a supporting convex block (24) is fixedly installed on one side of the supporting beam (3) and corresponds to the bottom convex block (22), an oblique supporting rod (23) is fixedly installed between the bottom convex block (22) and the supporting convex block (24), and a top hole (11) is formed in the upper surface of the square block (9).

4. A load monitoring device for a crane according to claim 3, characterized in that: the lower surface of slide rail frame (2) and in the equal fixed mounting in the corresponding position of every top hole (11) have movable post (14), the upper surface of crossbeam frame (1) and in the corresponding position of activity post (14) seted up and run through the round hole, the upper surface of dead lever (12) and in the corresponding position of activity post (14) seted up and run through groove (13), the bottom of activity post (14) is through running through the round hole and running through the inboard that groove (13) extended to top hole (11).

5. The load monitoring apparatus for a crane according to claim 1, wherein: load monitoring subassembly includes two connecting rods (20), two the equal fixed mounting in the lower surface of gyro wheel module (15) of connecting rod (20), two the one end fixed mounting that gyro wheel module (15) were kept away from in connecting rod (20) has backup pad (18), the upper surface of backup pad (18) is provided with weighing sensor (21), two there is fly leaf (17) just in the top movable mounting of weighing sensor (21) between connecting rod (20), one side fixed mounting of crossbeam frame (1) has auxiliary relay (5), one side of crossbeam frame (1) just in auxiliary relay (5) other fixed mounting have warning light (4), warning light (4) and auxiliary relay (5) electric connection, electric connection between auxiliary relay (5) and weighing sensor (21).

6. The load monitoring apparatus for a crane according to claim 5, wherein: two U type pole (19) have been cup jointed in the outside activity of connecting rod (20), U type pole (19) are the U type, the lower fixed surface of U type pole (19) installs couple (8), the outside of connecting rod (20) just is fixed cup jointed middle spring (16) between U type pole (19) and fly leaf (17).

7. The load monitoring apparatus for a crane according to claim 2, wherein: the upper surface of slide rail frame (2) is provided with two tracks (7), it has the top of slide rail frame (2) through two tracks (7) movable mounting to remove structure (6), the upper surface that removes structure (6) is provided with slide rail clearance subassembly, the equal fixed mounting in both sides of slide rail frame (2) has horizontal pole (30), two the top fixed mounting of horizontal pole (30) has dust cover (31), a plurality of bleeder vent (32) have been seted up to the both sides of dust cover (31).

8. The load monitoring apparatus for a crane according to claim 7, wherein: slide rail clearance subassembly includes air pump (34), the equal fixed mounting in both sides of moving structure (6) has suction hood (29), suction hood (29) the opening just to track (7), two air outlet fixedly connected with of air pump (34) connect trachea (28), the one end of keeping away from air pump (34) at the both ends of connecting trachea (28) respectively with two suction hood (29) fixed connection.

Technical Field

The invention relates to the technical field of cranes, in particular to load monitoring equipment for a crane.

Background

The crane mainly comprises a hoisting mechanism, an operating mechanism, a luffing mechanism, a slewing mechanism, a metal structure and the like, wherein the hoisting mechanism is a basic working mechanism of the crane, mostly consists of a hanging system and a winch, and also can lift heavy objects through a hydraulic system. The running mechanism is used for longitudinally and horizontally moving a heavy object or adjusting the working position of the crane and generally comprises a motor, a speed reducer, a brake and wheels.

However, the existing crane still has problems in use, for example, the existing crane is not equipped with a load monitoring mechanism, when in use, an operator cannot know whether the lifted article exceeds the specified maximum load of the crane, when the lifted article is too large in mass, the crane is easily damaged or the article falls to cause safety accidents, and when the lifting power of the existing crane is in the middle position of the beam frame, the stress of the middle position of the beam frame is large, the stress of two ends of the beam frame is small, and the situation that the beam frame is easily bent and deformed is easily caused.

Disclosure of Invention

The invention provides load monitoring equipment for a crane, which has the beneficial effects of automatically sensing whether an article is overweight and avoiding the complete cross beam frame, and solves the problems in the background technology.

The invention provides the following technical scheme: the utility model provides a load monitoring equipment for hoist, includes two supporting beam, and two supporting beam's upper surface is provided with the crossbeam frame, crossbeam frame upper surface is provided with the removal structure, it is connected with the gyro wheel module to remove structure lower surface transmission, be provided with balanced subassembly, two between crossbeam frame and the removal structure one side that supporting beam is close to each other all is provided with supporting component, supporting component's position corresponds with the position of crossbeam frame, the lower surface of gyro wheel module is provided with load monitoring subassembly.

As an alternative of the load monitoring device for the crane, the balancing assembly includes a slide rail frame, a plurality of movable tubes are arranged on the lower surface of the slide rail frame, corresponding holes are formed in the upper surface of the cross beam frame and at corresponding positions of each movable tube, two bottom grooves are formed in the lower surface of the cross beam frame, the bottom ends of the movable tubes extend to the inner sides of the bottom grooves through the corresponding holes, fixed rods are fixedly mounted on the inner sides of the bottom grooves, stand columns are fixedly mounted on the upper surface of the fixed rods and at corresponding positions of each movable tube, the top ends of the stand columns extend to the inner sides of the movable tubes, pressing rings are arranged at the bottom ends of the movable tubes, and buffer springs are movably sleeved between the pressing rings and the fixed rods on the outer sides of the stand columns.

As an alternative of the load monitoring device for the crane of the present invention, the supporting component includes a square block, the square block is fixedly mounted on one side of the supporting beam, a bottom protrusion is fixedly mounted on a lower surface of the square block, a supporting protrusion is fixedly mounted on one side of the supporting beam and at a position corresponding to the bottom protrusion, an oblique supporting rod is fixedly mounted between the bottom protrusion and the supporting protrusion, and a top hole is formed in an upper surface of the square block.

As an alternative of the load monitoring device for the crane of the present invention, a movable column is fixedly mounted on the lower surface of the rail frame at a position corresponding to each top hole, a through circular hole is formed in the upper surface of the beam frame at a position corresponding to the movable column, a through groove is formed in the upper surface of the fixed rod at a position corresponding to the movable column, and the bottom end of the movable column extends to the inner side of the top hole through the through circular hole and the through groove.

As an alternative of the load monitoring device for the crane, the load monitoring assembly comprises two connecting rods, the two connecting rods are fixedly mounted on the lower surface of the roller module, a supporting plate is fixedly mounted at one end, away from the roller module, of the two connecting rods, a weighing sensor is arranged on the upper surface of the supporting plate, a movable plate is movably mounted between the two connecting rods and above the weighing sensor, an intermediate relay is fixedly mounted on one side of the beam frame, an alarm lamp is fixedly mounted on one side of the beam frame and beside the intermediate relay, the alarm lamp is electrically connected with the intermediate relay, and the intermediate relay is electrically connected with the weighing sensor.

As an alternative scheme of the load monitoring equipment for the crane, U-shaped rods are movably sleeved on the outer sides of the two connecting rods, the U-shaped rods are U-shaped, hooks are fixedly installed on the lower surfaces of the U-shaped rods, and middle springs are fixedly sleeved on the outer sides of the connecting rods and between the U-shaped rods and the movable plate.

As an alternative of the load monitoring device for the crane, two rails are arranged on the upper surface of the slide rail frame, the moving structure is movably arranged above the slide rail frame through the two rails, a slide rail cleaning assembly is arranged on the upper surface of the moving structure, cross rods are fixedly arranged on two sides of the slide rail frame, dust covers are fixedly arranged above the two cross rods, and a plurality of air holes are formed in two sides of each dust cover.

As an alternative of the load monitoring device for the crane, the sliding rail cleaning assembly comprises an air pump, suction hoods are fixedly mounted on two sides of the moving structure, an opening of each suction hood faces the rail, two connecting air pipes are fixedly connected to an air outlet of the air pump, and one ends of the two ends of each connecting air pipe, which are far away from the air pump, are fixedly connected with the two suction hoods respectively. .

The invention has the following beneficial effects:

1. this load monitoring equipment for hoist, through setting up load monitoring subassembly, when the couple lifts up article, under the effect of article gravity, U type pole and couple downstream, make U type pole cause the extrusion to two intermediate spring, the intermediate spring is under the pressure of U type pole, downstream and compression, make the intermediate spring cause pressure to the fly leaf, make fly leaf weighing transducer cause pressure, can weigh the pressure that receives when weighing transducer is pressed, thereby reach the effect of control article quality, when the pressure that receives is greater than hoist regulation's pressure-bearing, weighing transducer gives intermediate relay with signal of telecommunication transmission, the power of intermediate relay switch-on warning light, make the warning light work, warning light work sends out the police dispatch newspaper, the overweight problem of suggestion operating personnel, avoided article overweight to cause the problem of incident.

2. The load monitoring equipment for the crane has the advantages that the balance component and the support component are arranged, the sliding rail frame can be pressed downwards when the moving structure lifts the object, thereby driving the movable tube below the slide rail frame to move downwards, when the movable tube moves downwards, the pressing ring can pressurize the buffer spring, the buffer spring is deformed under stress, the lower end of the buffer spring generates pressure on the fixed rod, thereby causing a part of the pressure applied to the slide rail frame to be applied to the fixed rod, thereby reducing the pressure applied to a part of the slide rail frame, when the slide rail frame moves downwards, the movable post is also driven to move downwards, when the bottom end of the movable post contacts the bottom of the top hole, the blocks play a role of supporting the movable post, therefore, pressure is effectively dispersed on the fixed rod, the square and the supporting beam, the problem that the sliding rail frame and the cross beam frame are bent when the sliding rail frame and the cross beam frame are pressed is avoided, and the effect of protecting the cross beam frame and the sliding rail frame is achieved.

3. This load monitoring equipment for hoist, through setting up slide rail clearance subassembly, the dust cover centers on in the outside of track and moving structure, wrap up track and moving structure inside it, can avoid some foreign matters to fall on orbital top, thereby cause the problem that influences the moving structure and remove, when moving structure removes, the air pump is in operating condition, moving structure removes the absorption cover that can drive both sides and removes, air pump work can extract the inboard air of absorption cover, make the inboard atmospheric pressure of absorption cover reduce, make the dust on track surface and the less foreign matter of volume follow the air and are inhaled the inboard of absorption cover, thereby reach the orbital effect of clearance, it causes the moving structure to remove to be obstructed to avoid the foreign matter to appear above the track.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a sectional view of the overall structure of the present invention.

Fig. 3 is an exploded view of the balance assembly structure of the present invention.

Fig. 4 is an exploded view of the slide rail cleaning assembly according to the present invention.

FIG. 5 is an enlarged view of the invention at A in FIG. 1.

FIG. 6 is an enlarged view of the invention at B in FIG. 1.

FIG. 7 is an enlarged view of the invention at C in FIG. 2.

Fig. 8 is an enlarged view of fig. 3 at D according to the present invention.

In the figure: 1. a cross beam frame; 2. a slide rail frame; 3. a support beam; 4. an alarm light; 5. an intermediate relay; 6. a moving structure; 7. a track; 8. hooking; 9. a square block; 10. a movable tube; 11. a top aperture; 12. fixing the rod; 13. a through groove; 14. a movable post; 15. a roller module; 16. a middle spring; 17. a movable plate; 18. a support plate; 19. a U-shaped rod; 20. a connecting rod; 21. a weighing sensor; 22. a bottom bump; 23. an oblique supporting rod; 24. supporting the projection; 25. a bottom groove; 26. a column; 27. pressing a ring; 28. connecting an air pipe; 29. a suction hood; 30. a cross bar; 31. a dust cover; 32. air holes are formed; 33. a buffer spring; 34. an air pump.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1-8, a load monitoring device for a crane includes two supporting beams 3, a cross beam frame 1 is disposed on the upper surface of the two supporting beams 3, a moving structure 6 is disposed on the upper surface of the cross beam frame 1, a roller module 15 is connected to the lower surface of the moving structure 6 in a transmission manner, a balancing module is disposed between the cross beam frame 1 and the moving structure 6, supporting modules are disposed on the sides of the two supporting beams 3, which are close to each other, the positions of the supporting modules correspond to the positions of the cross beam frame 1, and a load monitoring module is disposed on the lower surface of the roller module 15.

In the specific embodiment of the invention, by arranging the balance component, when the crane works, the balance component disperses the pressure on the cross beam frame 1 and the slide rail frame 2 to the supporting beam 3, thereby avoiding the bending problem caused by uneven stress on the cross beam frame 1 and the slide rail frame 2, by arranging the supporting component, the supporting component can play a role of supporting the slide rail frame 2, so that when the slide rail frame 2 is stressed, part of the pressure is dispersed to the supporting component, and by arranging the load monitoring component, the weight of an object lifted by the crane during working can be monitored in real time, thereby avoiding the problem that the crane is damaged due to the overweight of the lifted object.

Example two

The embodiment is an improvement made above embodiment 1, and specifically please refer to fig. 2-3 and 8, the balancing assembly includes a sliding rail frame 2, a plurality of movable tubes 10 are disposed on a lower surface of the sliding rail frame 2, corresponding holes are disposed on an upper surface of the cross beam frame 1 and corresponding positions of each movable tube 10, two bottom grooves 25 are disposed on the lower surface of the cross beam frame 1, a bottom end of each movable tube 10 extends to an inner side of each bottom groove 25 through the corresponding hole, a fixing rod 12 is fixedly mounted on an inner side of each bottom groove 25, an upright post 26 is fixedly mounted on an upper surface of each fixing rod 12 and corresponding position of each movable tube 10, a top end of each upright post 26 extends to the inner side of each movable tube 10, a pressing ring 27 is disposed at a bottom end of each movable tube 10, and a buffer spring 33 is movably sleeved on an outer side of each upright post 26 and between the pressing ring 27 and the fixing rod 12.

In this embodiment: when the position of moving structure 6 is located the position that is close to crossbeam frame 1 center above the crossbeam frame 1, can oppress slide rail frame 2 downwards during the mobile structure 6 jack-up, slide rail frame 2 receives downstream behind the pressure, thereby drive the movable tube 10 of slide rail frame 2 below and remove downwards, press ring 27 and can pressurize buffer spring 33 when movable tube 10 removes downwards, buffer spring 33 atress takes place to deform, buffer spring 33's lower extreme produces pressure to dead lever 12, thereby make on some pressure that slide rail frame 2 received is exerted dead lever 12, thereby reduce the pressure that some slide rail frame 2 received, thereby reach the effect of protection crossbeam frame 1 and slide rail frame 2.

EXAMPLE III

In this embodiment, an improvement is made on embodiment 2, and specifically referring to fig. 6, the supporting assembly includes a block 9, the block 9 is fixedly installed on one side of the supporting beam 3, a bottom bump 22 is fixedly installed on a lower surface of the block 9, a supporting bump 24 is fixedly installed on one side of the supporting beam 3 and at a position corresponding to the bottom bump 22, an inclined supporting rod 23 is fixedly installed between the bottom bump 22 and the supporting bump 24, and a top hole 11 is opened on an upper surface of the block 9.

In this embodiment: through setting up bottom lug 22 and support lug 24, bottom lug 22 is installed on square 9, and support lug 24 is installed on a supporting beam 3, and rethread slant supporting rod 23 connects bottom lug 22 and support lug 24 for square 9, a supporting beam 3 and slant supporting rod 23 constitute the triangle-shaped structure, make the position of square 9 more stable.

Example four

In this embodiment, an improvement is made on embodiment 3, specifically referring to fig. 7, a movable column 14 is fixedly mounted on the lower surface of the slide rail frame 2 at a position corresponding to each top hole 11, a through circular hole is formed in the upper surface of the cross beam frame 1 at a position corresponding to the movable column 14, a through groove 13 is formed in the upper surface of the fixed rod 12 at a position corresponding to the movable column 14, and the bottom end of the movable column 14 extends to the inner side of the top hole 11 through the through circular hole and the through groove 13.

In this embodiment: when the slide rail frame 2 moves downwards, the movable column 14 is also driven to move downwards, when the bottom end of the movable column 14 contacts the bottom of the top hole 11, the blocks 9 play a role of supporting the movable column 14, so that the slide rail frame 2 is supported, pressure applied to the slide rail frame 2 is applied to the blocks 9, the pressure is effectively dispersed on the fixed rods 12, the blocks 9 and the supporting beam 3, and the problem that the slide rail frame 2 and the beam frame 1 bend when being pressed is avoided.

EXAMPLE five

The present embodiment is an improvement made on embodiment 1, specifically please refer to fig. 1 and 5, the load monitoring assembly includes two connecting rods 20, two connecting rods 20 are both fixedly mounted on the lower surface of the roller module 15, one end of each of the two connecting rods 20, which is far away from the roller module 15, is fixedly mounted with a supporting plate 18, the upper surface of the supporting plate 18 is provided with a weighing sensor 21, a movable plate 17 is movably mounted between the two connecting rods 20 and above the weighing sensor 21, one side of the beam frame 1 is fixedly mounted with an intermediate relay 5, one side of the beam frame 1 is fixedly mounted with an alarm lamp 4 beside the intermediate relay 5, the alarm lamp 4 is electrically connected with the intermediate relay 5, and the intermediate relay 5 is electrically connected with the weighing sensor 21.

In this embodiment: when couple 8 hoisted article, make fly leaf 17 weighing sensor 21 cause pressure, weighing sensor 21 can weigh the pressure that receives when being pressed, when the pressure that receives is greater than the pressure-bearing of hoist regulation, weighing sensor 21 gives auxiliary relay 5 with signal of telecommunication transmission, auxiliary relay 5 switches on the power of warning light 4, make warning light 4 work, warning light 4 work sends out the police dispatch newspaper, the overweight problem of suggestion operating personnel, thereby reach the overweight problem of article of avoiding hoisting.

EXAMPLE six

In this embodiment, an improvement is made on embodiment 5, specifically, referring to fig. 5, a U-shaped rod 19 is movably sleeved on the outer sides of two connecting rods 20, the U-shaped rod 19 is U-shaped, a hook 8 is fixedly mounted on the lower surface of the U-shaped rod 19, and an intermediate spring 16 is fixedly sleeved on the outer side of the connecting rod 20 and between the U-shaped rod 19 and the movable plate 17.

In this embodiment: under the effect of article gravity, drive U type pole 19 and couple 8 downstream for U type pole 19 causes the extrusion to two intermediate spring 16, and intermediate spring 16 moves down and compresses under the pressure of U type pole 19, makes intermediate spring 16 cause pressure to fly leaf 17, thereby makes fly leaf 17 weighing sensor 21 cause pressure, makes weighing sensor 21 can monitor the article quality of hoisting.

EXAMPLE seven

The embodiment is an improvement made on embodiment 2, and specifically please refer to fig. 4, two rails 7 are arranged on the upper surface of the slide rail frame 2, the moving structure 6 is movably mounted above the slide rail frame 2 through the two rails 7, a slide rail cleaning assembly is arranged on the upper surface of the moving structure 6, cross rods 30 are fixedly mounted on two sides of the slide rail frame 2, dust covers 31 are fixedly mounted above the two cross rods 30, and a plurality of air holes 32 are formed in two sides of the dust covers 31.

In this embodiment: during daily use, the dust cover 31 surrounds in the outside of track 7 and removal structure 6, wraps up track 7 and removal structure 6 inside it, can avoid some foreign matters to fall on track 7's top to cause the problem that influences removal structure 6 and remove, set up a plurality of bleeder vent 32 in the both sides of dust cover 31, make removal structure 6 heat dissipation that can be quick, avoid setting up of dust cover 31 to influence the radiating problem of removal structure 6.

Example eight

The embodiment is an improvement made on embodiment 7, and specifically please refer to fig. 4, the sliding rail cleaning assembly includes an air pump 34, suction covers 29 are fixedly mounted on both sides of the moving structure 6, an opening of each suction cover 29 faces the rail 7, two connecting air pipes 28 are fixedly connected to an air outlet of the air pump 34, and one ends of both ends of each connecting air pipe 28, which are far away from the air pump 34, are fixedly connected to the two suction covers 29, respectively.

In this embodiment: when the moving structure 6 moves left and right, the air pump 34 is in a working state, the moving structure 6 moves to drive the suction hoods 29 on the two sides to move, the air pump 34 works to extract air inside the suction hoods 29, air pressure inside the suction hoods 29 is reduced, dust on the surface of the track 7 and foreign matters with small volume are sucked into the inner sides of the suction hoods 29 along with the air, and therefore the effect of cleaning the track 7 is achieved.

The working principle is that when the invention is used, when an object is lifted by the hook 8, the U-shaped rod 19 and the hook 8 are driven to move downwards under the action of the gravity of the object, so that the U-shaped rod 19 extrudes the two middle springs 16, the middle springs 16 move downwards and compress under the pressure of the U-shaped rod 19, so that the middle springs 16 pressurize the movable plate 17, the movable plate 17 is pressurized by the symmetrical weighing sensor 21, the pressurized pressure can be weighed when the weighing sensor 21 is pressurized, when the pressurized pressure is greater than the specified pressure of a crane, the weighing sensor 21 transmits an electric signal to the middle relay 5, the middle relay 5 is connected with the power supply of the alarm lamp 4, so that the alarm lamp 4 works, the alarm lamp 4 works to give an alarm to prompt an operator of overweight, when the invention is used daily, the dustproof cover 31 surrounds the outer sides of the track 7 and the movable structure 6, the track 7 and the moving structure 6 are wrapped in the track 7 and the moving structure 6 can avoid the problem that some foreign matters fall on the track 7 to influence the movement of the moving structure 6, when the moving structure 6 moves leftwards and rightwards, the air pump 34 is in a working state, the moving structure 6 moves to drive the suction hoods 29 at two sides to move, the air pump 34 works to pump air at the inner sides of the suction hoods 29, so that air pressure at the inner sides of the suction hoods 29 is reduced, dust on the surface of the track 7 and foreign matters with smaller volumes are sucked into the inner sides of the suction hoods 29 along with the air, when the position of the moving structure 6 is positioned above the cross beam frame 1 and close to the center of the cross beam frame 1, the moving structure 6 presses the slide rail frame 2 downwards when lifting objects, the slide rail frame 2 moves downwards after being pressed, so as to drive the movable tube 10 below the slide rail frame 2 to move downwards, and when the movable tube 10 moves downwards, the press the buffer spring 33, the buffer spring 33 is stressed and deformed, the lower end of the buffer spring 33 generates pressure on the fixed rod 12, so that a part of pressure on the slide rail frame 2 is applied to the fixed rod 12, so that the pressure on a part of the slide rail frame 2 is reduced, the movable column 14 is driven to move downwards in the downward movement process of the slide rail frame 2, when the bottom end of the movable column 14 is contacted with the bottom of the top hole 11, the blocks 9 play a role of supporting the movable column 14, so that the slide rail frame 2 is supported, the pressure on the slide rail frame 2 is applied to the blocks 9, the pressure is effectively dispersed on the fixed rod 12, the blocks 9 and the supporting beam 3, and the problem that the slide rail frame 2 and the transverse beam frame 1 are bent when being pressed is avoided.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.