CN217819392U - Load test device of casting bridge crane - Google Patents

Abstract

The utility model relates to a load test device of cast bridge crane, this load test device include weight platform and two lugs. Weight platform top is located to two lugs, and each lug all is including being first davit and the second davit that the contained angle set up. Each davit all includes the reinforcing plate that is two connecting plates that parallel interval set up and connects between two connecting plates, and the lower extreme of two connecting plates links to each other with the weight platform. Each lifting lug further comprises a fastener, the two ends of the fastener are respectively connected with the upper ends of the two connecting plates in the first lifting arm and the upper ends of the two connecting plates in the second lifting arm, and an abdicating space for the hook to pass through is formed between the fastener and the two connecting plates and the reinforcing plate in each lifting arm. Utilize the weight platform can bear many square billets steadily, recycle the lifting hook and pass the space of stepping down on the lug and collude and hang the upper fixing piece to hang the square billet on weight platform and the weight platform, replace the weight to carry out load test.

Description

Load test device of casting bridge crane

Technical Field

The utility model relates to a crane equipment technical field, in particular to cast bridge crane's load test device.

Background

With the development of economy and the increase of steel production, the converter of a steel plant is increasingly large. In recent years, large-scale converters in China have been developed greatly, and the technology is mature. The tonnage of the matched bridge cranes for hoisting the iron and steel ladles is also increased, for example, the 150t converter steelmaking workshop charging span and molten steel receiving span bridge crane is 280-300t, and the 210t converter steelmaking workshop charging span and molten steel receiving span bridge crane is 350-380t.

According to the regulations of safety regulations of hoisting machinery, the hoisting machinery needs to be subjected to a no-load test, a rated load test, a dynamic load test (1.1 times) and a static load test (1.25 times) before being put into use, so that the reliability of the hoisting machinery is verified, and the safe and reliable operation of the hoisting machinery in the use process is ensured. For a long time, the standard weights are difficult to transport to the site when the hoisting machinery is installed, accepted, supervised and checked to carry out load tests. For steel mills, it is common to use continuous casting slabs as a weight substitute for the test. If the steel mill produces large-section slabs, because a single slab has enough weight, a plurality of slabs can be fixed together by using a steel wire rope, and the weight required by a load test can be achieved. However, if the steel mill only produces small-section billets (the common section size is 150X150mm < 2 >), at least hundreds of billets are needed to meet the weight requirement required by the load test, how to effectively fix the numerous billets becomes a troublesome problem, and major safety accidents are easily caused once the large-section billets are not properly handled.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a load test device of casting bridge crane can be convenient for fix the square billet that is used for the load test.

In order to solve the technical problem, the utility model adopts the following technical scheme.

According to an aspect of the utility model, the utility model provides a load test device of casting bridge crane, casting bridge crane includes two lifting hooks, and this load test device includes: a weight platform; the lifting device comprises a weight platform, two lifting lugs, a lifting mechanism and a lifting mechanism, wherein the two lifting lugs are arranged above the weight platform, and each lifting lug comprises a first lifting arm and a second lifting arm which are arranged at an included angle; each suspension arm comprises two connecting plates arranged in parallel at intervals and a reinforcing plate connected between the two connecting plates, and the lower ends of the two connecting plates are connected with the weight platform; and each lifting lug further comprises a fastener, two ends of the fastener are respectively connected with the upper ends of the two connecting plates in the first lifting arm and the upper ends of the two connecting plates in the second lifting arm, and an abdicating space for the lifting hook to pass through is formed between the fastener and the two connecting plates and the reinforcing plate in each lifting arm.

In some embodiments of the present application, a lower end of the connecting plate is hinged to the weight platform, and an upper end of the connecting plate is hinged to the fastening member.

In some embodiments of the present application, each of the lifting lugs further includes two upper clamping plates; one of the connecting plates in the first boom is positioned between two of the connecting plates in the second boom, and the other connecting plate in the first boom is positioned outside of two of the connecting plates in the second boom; the upper ends of the two connecting plates in the first suspension arm are provided with first through holes, and the upper ends of the two connecting plates in the second suspension arm are provided with second through holes which are coaxially arranged with the first through holes; the fastener comprises a head and a rod, the head is positioned on the outer side of a connecting plate in the second suspension arm, and the rod penetrates through the two first through holes and the two second through holes and extends out of the outer side of the connecting plate in the first suspension arm; the part of the rod part extending out of the outer side of the connecting plate in the first suspension arm is provided with two clamping grooves which are arranged at intervals in the circumferential direction; the upper clamping plates are correspondingly clamped in the clamping grooves one by one and are connected with the connecting plate in the first suspension arm.

In some embodiments of the present application, the upper clamping plate is detachably connected to the connecting plate in the first suspension arm.

In some embodiments of the present application, each of the lifting lugs further includes two first ear plates disposed in parallel at an interval, a first connecting member connected to the two first ear plates, two second ear plates disposed in parallel at an interval, and a second connecting member connected to the two second ear plates; the lower ends of the two connecting plates in the first suspension arm are provided with first through holes and are positioned between the two first lug plates; the first connecting piece is rotatably arranged in the first through holes on the two connecting plates in a penetrating way; the lower ends of the two connecting plates in the second suspension arm are provided with second through holes and are positioned between the two second lug plates; the second connecting piece is rotatably arranged in the second through holes on the two connecting plates in a penetrating way.

In some embodiments of the present application, each of the lifting lugs further includes two first lower clamping plates; the two first ear plates are provided with first mounting holes which are coaxially arranged with the first through holes; the first connecting piece comprises a first head part and a first rod part, the first head part is positioned on the outer side of one of the first lug plates, and the first rod part is arranged in the two first mounting holes and the two first through holes in a penetrating manner and extends out of the outer side of the other first lug plate; the part of the first rod part extending out of the other first lug plate is provided with two first lower clamping grooves which are arranged at intervals in the circumferential direction; the first lower clamping plates are correspondingly clamped in the first lower clamping plates one by one and connected with the other first ear plate.

In some embodiments of the present application, each of the lifting lugs further includes two second lower clamping plates; the two second ear plates are provided with second mounting holes which are coaxially arranged with the second through holes; the second connecting piece comprises a second head part and a second rod part, the second head part is positioned on the outer side of one of the second ear plates, and the second rod part is arranged in the two second mounting holes and the two second through holes in a penetrating manner and extends out of the outer side of the other second ear plate; the part of the second rod part extending out of the other second ear plate is provided with two second lower clamping grooves which are circumferentially arranged at intervals; the second lower clamping plates are correspondingly clamped in the second lower clamping plates one by one and connected with the other second ear plate.

In some embodiments of the present application, the reinforcing plate is provided in plurality at intervals; and an abdicating space for the hook to pass through is arranged between the fastener and the two connecting plates in each suspension arm and the reinforcing plate close to the fastener.

In some embodiments of the present application, the included angle is an acute angle or an obtuse angle.

In some embodiments of the present application, the two lifting lugs are symmetrically disposed and respectively disposed in the middle of two opposite side edges of the top of the weight platform.

According to the above technical scheme, the embodiment of the utility model provides an at least have following advantage and positive effect:

the utility model discloses among cast bridge crane's the load test device, utilize the weight platform can bear many square billets steadily, recycle the lifting hook and pass the space of stepping down on the lug and collude and hang and go up the fastener to square billet on hoisting weight platform and the weight platform replaces the weight to carry out load test. The double lifting lugs can ensure that the whole structure of the load test device has better balance performance, and the safe reliability in the test process is ensured. The square billet can be recycled after the test is finished, so that the conditions can be adjusted according to the local conditions, and the purchase cost of the standard weights or the plate blanks is reduced.

Drawings

Fig. 1 is a front view of a load testing apparatus of a bridge crane according to an embodiment of the present invention in practical use.

Fig. 2 is a plan view of the load test apparatus of the casting bridge crane in fig. 1.

Fig. 3 is a side view of fig. 2.

Fig. 4 is an enlarged schematic view of the region a in fig. 2.

Fig. 5 is an enlarged schematic view of a region B in fig. 2.

Fig. 6 is an enlarged schematic view of the region C of fig. 3.

Fig. 7 is an enlarged schematic view of a middle D region of fig. 2.

The reference numerals are illustrated below: 1. a crane body; 11. a hook; 2. a weight platform; 3. lifting lugs; 31. a first boom; 32. a second boom; 33. a fastener; 331. a head; 332. a rod portion; 300. a space of abdication; 301. a connecting plate; 302. a reinforcing plate; 303. an upper clamping plate; 304. a first ear plate; 305. a first connecting member; 3051. a first head portion; 3052. a first rod portion; 306. a first lower clamping plate; 307. a second ear panel; 308. a second connecting member; 3081. a second head; 3082. a second rod portion; 309. a second lower clamping plate; 4. and (5) square billet.

Detailed Description

While the present invention may be susceptible to embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present description is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to that as illustrated herein.

Thus, a feature indicated in this specification will serve to explain one of the features of an embodiment of the invention, and not to imply that every embodiment of the invention must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.

In the embodiments shown in the drawings, directional references (such as upper, lower, left, right, front and rear) are used to explain the structure and movement of the various elements of the invention not absolutely, but relatively. These illustrations are appropriate when the elements are in the positions shown in the figures. If the description of the positions of these elements changes, the indication of these directions changes accordingly.

The preferred embodiments of the present invention will be further described in detail with reference to the accompanying drawings.

Referring to fig. 1, the present invention provides a load test apparatus for a bridge crane, which is mainly used for stably bearing a billet 4, so as to achieve the weight required to be carried by the bridge crane during the load test, and thus, the load test apparatus bearing the billet 4 is lifted by two hooks 11 on a crane body 1 to perform the load test, instead of a standard weight.

The load test device of the casting bridge crane mainly comprises a weight platform 2 and a lifting lug 3 connected to the top of the weight platform 2.

The weight platform 2 is approximately in a cuboid shape, and the top surface of the weight platform is used for bearing the square billet 4. In some embodiments, the weight platform 2 is a rectangular parallelepiped frame structure formed by tailor-welding steel plates, so that the weight platform has high strength and can reduce the overall manufacturing cost of the weight platform 2. Specifically, the weight platform 2 may be formed by welding two parallel steel plates at intervals and a plurality of longitudinal and transverse reinforcing ribs between the two steel plates.

The lug 3 is arranged above the weight platform 2, and the lower end of the lug 3 is connected with the top of the weight platform 2. The lifting lugs 3 are two, and the two lifting hooks 11 respectively hook the two lifting lugs 3, so that the whole load test device is lifted.

In some embodiments, the two lifting lugs 3 are symmetrically arranged and respectively arranged in the middle of the two opposite side edges of the top of the weight platform 2, so that more space for bearing the billet 4 can be reserved between the two lifting lugs 3, and the balance stability of the whole load test device when the whole load test device is lifted can be ensured.

Referring to fig. 1 to 3, each lifting lug 3 includes a first suspension arm 31 and a second suspension arm 32 disposed at an included angle, the first suspension arm 31 and the second suspension arm 32 have equal lengths, the first suspension arm 31 is disposed at an oblique angle relative to the weight platform 2, the second suspension arm 32 is also disposed at an oblique angle relative to the weight platform 2, and the included angle between the first suspension arm 31 and the second suspension arm 32 is an acute angle or an obtuse angle.

In other embodiments, the lengths of the first boom 31 and the second boom 32 may be different, and the first boom 31 or the first boom 31 may be perpendicular to the weight platform 2, and the other one is disposed at an oblique angle with respect to the weight platform 2. For example, the first boom 31 has a short length, the first boom 31 is perpendicular to the weight platform 2, the second boom 32 has a long length, and the second boom 32 is arranged at an oblique angle to the weight platform 2.

Each suspension arm comprises two connecting plates 301 arranged in parallel at intervals and a reinforcing plate 302 connected between the two connecting plates 301, the lower ends of the two connecting plates 301 are connected with the weight platform 2, and the structural strength of the suspension arm can be enhanced by using the two connecting plates 301.

Referring to fig. 4, it can be understood that when the lengths and widths of the first boom 31 and the second boom 32 are equal, the first boom 31 and the second boom 32 can be conveniently manufactured. At this time, one connecting plate 301 in the first boom 31 is located between two connecting plates 301 in the second boom 32, and the other connecting plate 301 in the first boom 31 is located outside the two connecting plates 301 in the second boom 32.

In other embodiments, when the width of the first boom 31 is smaller than the width of the second boom 32, the two connecting plates 301 in the first boom 31 are located between the two connecting plates 301 in the second boom 32.

Referring to fig. 3, each lifting lug 3 further includes a fastening member 33, two ends of the fastening member 33 are respectively connected to the upper ends of the two connecting plates 301 of the first lifting arm 31 and the upper ends of the two connecting plates 301 of the second lifting arm 32, and an abdicating space 300 for the hook 11 to pass through is formed between the fastening member 33 and the two connecting plates 301 and the reinforcing plate 302 of each lifting arm.

The hook 11 can pass through the abdicating space 300 on the first hanging arm 31 and the second hanging arm 32, so as to hook the fastener 33 and lift the whole load testing device.

In some embodiments, the reinforcing plates 302 are provided in a plurality at intervals in parallel, and the space 300 is formed between the fastener 33 and the two connecting plates 301 and the reinforcing plates 302 near the fastener 33 in each suspension arm. By providing a plurality of stiffening plates 302, the structural strength of the boom arm is further enhanced. It should be noted that the plurality of reinforcing plates 302 may not be parallel to each other.

In some embodiments, the lower end of the connecting plate 301 is hinged to the weight platform 2, that is, the lower end of the connecting plate 301 is not rigidly connected to the weight platform 2, so that the connection failure caused by stress concentration at the connection between the lower end of the connecting plate 301 and the weight platform 2 can be avoided from being broken. The upper end of the connecting plate 301 is hinged to the fastener 33, that is, the upper end of the connecting plate 301 is not rigidly connected to the fastener 33, so that the connection failure caused by stress concentration at the connection position of the upper end of the connecting plate 301 and the fastener 33 can be avoided from being broken.

Referring to fig. 4, in some embodiments, each lifting lug 3 further comprises two upper clamping plates 303. The upper ends of the two connecting plates 301 in the first boom 31 are provided with first through holes, and the upper ends of the two connecting plates 301 in the second boom 32 are provided with second through holes arranged coaxially with the first through holes.

The fastener 33 includes a head 331 and a rod 332, the head 331 is located at the outer side of a connecting plate 301 in the second suspension arm 32, and the rod 332 is inserted into the two first through holes and the two second through holes and extends out of the outer side of the connecting plate 301 in the first suspension arm 31. The portion of the rod 332 extending out of the first boom 31 outside the connecting plate 301 is provided with two circumferentially spaced slots. The upper clamping plates 303 are correspondingly clamped in the clamping grooves and connected with the connecting plate 301 in the first suspension arm 31.

The fastener 33 can be stably attached by the two upper fastening plates 303 being engaged with the two engaging grooves in the shaft 332 of the fastener 33. The upper end of the first boom 31 can be turned around the shank 332 of the fastener 33 through the first through hole. The upper end of the second boom 32 can be rotated about the shank 332 of the fastener 33 through the second through hole. It will be appreciated that the fastener 33 may be formed by a pivot pin with two slots.

In other embodiments, the fastening element 33 may be a shaft pin without two slots, or two upper clamping plates 303, and the fastening element may be directly inserted into a hole on the shaft pin for fixing.

In some embodiments, the upper clamping plate 303 is detachably connected to the connecting plate 301 in the first boom 31, for example, a bolt connection may be used, so as to facilitate installation and removal.

Referring mainly to fig. 2, in some embodiments, each lifting lug 3 further includes two first ear plates 304 disposed in parallel and spaced apart, a first connecting member 305 connected to the two first ear plates 304, two second ear plates 307 disposed in parallel and spaced apart, and a second connecting member 308 connected to the two second ear plates 307. The lower ends of the two connecting plates 301 in the first suspension arm 31 are provided with first through holes and located between the two first ear plates 304. The first connecting member 305 is rotatably disposed through the first through holes of the two connecting plates 301. The lower ends of the two connecting plates 301 in the second suspension arm 32 are provided with second through holes and located between the two second ear plates 307. The second connecting member 308 is rotatably disposed through the second through holes of the two connecting plates 301. The first connecting element 305 can be fixedly connected to the two first ear plates 304, and the first suspension arm 31 can also rotate around the first connecting element 305 through the first through hole. The second connection 308 can also be fixedly connected to the two second ear plates 307, and the second boom 32 can also rotate around the second connection 308 through the second through hole.

Referring to fig. 5 and 6, in some embodiments, each lifting lug 3 further includes two first lower clamping plates 306. The first ear plates 304 are provided with first mounting holes coaxially arranged with the first through holes. The first connecting member 305 includes a first head 3051 and a first rod 3052, the first head 3051 is located outside one of the first ear plates 304, and the first rod 3052 is inserted into the two first mounting holes and the two first through holes and extends out of the other first ear plate 304. The part of the first rod part 3052 extending out of the other first ear plate 304 is provided with two first lower clamping grooves arranged at intervals in the circumferential direction. The first lower clamping plates 306 are correspondingly clamped in the first lower clamping plates 306 and connected with the other first ear plate 304.

The first connecting element 305 can be stably installed by using the two first lower locking plates 306 to be locked in the first lower locking grooves on the first rod part 3052 of the first connecting element 305. The lower end of the first boom 31 may be rotated about the first rod part 3052 of the first link 305 through the first through-hole.

In other embodiments, the first connecting member 305 may be a shaft pin without two slots, and the first lower fastening plate 306 may also be two first lower fastening plates, and the first lower fastening plates are directly fixed by inserting a pin into a hole on the shaft pin.

In some embodiments, the first lower clamping plate 306 is detachably connected to the first ear plate 304, for example, by bolts, to facilitate installation and removal.

Referring to fig. 7, in some embodiments, each lifting lug 3 further comprises two second lower clamping plates 309. The second ear plates 307 are provided with second mounting holes arranged coaxially with the second through holes. The second connecting member 308 includes a second head portion 3081 and a second rod portion 3082, the second head portion 3081 is located at an outer side of one of the second ear plates 307, and the second rod portion 3082 is inserted into the two second mounting holes and the two second through holes and extends out of an outer side of the other second ear plate 307. The portion of the second shaft portion 3082 protruding from the other second ear plate 307 is provided with two second lower locking grooves arranged at intervals in the circumferential direction. The second lower fastening plates 309 are correspondingly fastened in the second lower fastening plates 309, and connected to the other second ear plate 307.

The second connector 308 can be stably installed by using the two second lower clamping plates 309 to be clamped in the second lower clamping grooves on the second rod portion 3082 of the second connector 308. The lower end of the second boom 32 can be rotated about the second rod portion 3082 of the second link 308 through the second through hole.

In other embodiments, the second connecting member 308 may be a shaft pin without two slots, and two second lower fastening plates 309 may also be omitted, and the pin may be directly inserted into a hole on the shaft pin for fixing.

In some embodiments, the second lower clamping plate 309 is detachably connected to the second ear plate 307, for example, by bolts, to facilitate installation and removal.

It will be appreciated that the fastener 33, the first connector 305 and the second connector 308 may be of the same construction to reduce manufacturing costs.

With the load test apparatus of the bridge crane for casting in the above embodiment, the experiment can be performed by the following procedure.

Step one, determining the number of square billets 4 required by the experiment.

And calculating the weight of the single standard square billet 4 according to the section size and the length size of the square billet 4. The quantity of the square billets 4 required to be used is determined according to the requirements of the rated load of 1 time, 1.1 time and 1.25 times of the trial weight of the crane.

Step two: and (4) preparing the counterweight.

Preparing a corresponding number of square billets 4 according to the requirement calculated in the first step, transporting the square billets 4 to a trial weighing site, loading the square billets 4 into the weight platform 2 by using a crane clamp and recording.

Step three: static load test of crane

The static load test includes a 1-time static load test and a 1.25-time static load test. Firstly, a hoisting mechanism is started to carry out the empty load lifting operation, and the trolley is made to run back and forth on the full stroke, the empty load test run should not be less than three times, and no abnormal phenomenon should occur. Then the trolley is stopped at the midspan of the crane, the crane hook 11 descends, the hook tip bypasses the lower edge of the fastener 33, the crane hook 11 is horizontally moved to vertically lift 1 time of rated load after hooking the fastener 33, so that the trolley does not have abnormal phenomena in each part after the trolley runs back and forth for a plurality of times on the whole stroke of the bridge, and the bridge structure does not have abnormal phenomena after unloading the load. And finally, stopping the trolley in the span of the bridge crane, lifting the load which is 1.25 times of the rated lifting capacity without impact, suspending and staying for no less than 10min at the position with the height of 100-200 mm from the ground, and avoiding instability, then unloading the load, driving the trolley to the span end, and performing various inspections according to the specified requirements.

Step four: dynamic load test of crane

Firstly, the main trolley is stopped in the midspan, the crane hook 11 descends, the hook tip bypasses from the lower edge of the fastener 33, the crane hook 11 is horizontally moved to vertically lift a load 1.1 times of rated lifting capacity after hooking the fastener 33 for trial run, then the crane trolley runs once in the whole course, and various checks are carried out according to the specified requirements.

Based on the technical scheme, the embodiment of the utility model provides a following advantage and positive effect have at least.

The utility model discloses among cast bridge crane's load test device, utilize weight platform 2 to bear many square billets 4 steadily, recycle lifting hook 11 and pass the space of stepping down 300 on lug 3 and collude and hang up fastener 33 to hang square billet 4 on weight platform 2 and the weight platform 2, replace the weight to carry out load test. The double lifting lugs 3 can ensure that the whole structure of the load test device has better balance performance, and the safety and reliability of the test process are ensured. The square billet 4 can be recycled after the test is finished, so that the conditions can be adjusted according to the local conditions, and the purchase cost of standard weights or plate blanks can be reduced.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A load test apparatus for a cast bridge crane, the cast bridge crane including two lifting hooks, comprising:

a weight platform;

the two lifting lugs are arranged above the weight platform, and each lifting lug comprises a first lifting arm and a second lifting arm which are arranged at an included angle; each suspension arm comprises two connecting plates arranged in parallel at intervals and a reinforcing plate connected between the two connecting plates, and the lower ends of the two connecting plates are connected with the weight platform;

each lifting lug further comprises a fastener, two ends of the fastener are respectively connected with the upper ends of the two connecting plates in the first lifting arm and the upper ends of the two connecting plates in the second lifting arm, and an abdicating space for the lifting hook to pass through is formed between the fastener and the two connecting plates and the reinforcing plate in each lifting arm.

2. The load testing apparatus of a bridge crane according to claim 1, wherein the lower end of the connecting plate is hinged to the weight platform, and the upper end of the connecting plate is hinged to the fastening member.

3. A load testing apparatus for a bridge crane as claimed in claim 2, wherein each lifting lug further comprises two upper clamping plates;

one of the connecting plates in the first suspension arm is positioned between two of the connecting plates in the second suspension arm, and the other connecting plate in the first suspension arm is positioned outside the two connecting plates in the second suspension arm;

the upper ends of the two connecting plates in the first suspension arm are provided with first through holes, and the upper ends of the two connecting plates in the second suspension arm are provided with second through holes which are coaxially arranged with the first through holes;

the fastener comprises a head and a rod, the head is positioned on the outer side of a connecting plate in the second suspension arm, and the rod penetrates through the two first through holes and the two second through holes and extends out of the outer side of the connecting plate in the first suspension arm;

the part of the rod part extending out of the outer side of the connecting plate in the first suspension arm is provided with two clamping grooves which are arranged at intervals in the circumferential direction;

the upper clamping plates are correspondingly clamped in the clamping grooves one by one and are connected with the connecting plate in the first suspension arm.

4. A load testing apparatus for a bridge crane as claimed in claim 3, wherein said upper clamping plate is removably connected to said connecting plate in said first boom.

5. The load testing device of a casting bridge crane according to claim 1, wherein each of the lifting lugs further comprises two first lug plates arranged in parallel and spaced apart, a first connecting member connected to the two first lug plates, two second lug plates arranged in parallel and spaced apart, and a second connecting member connected to the two second lug plates;

the lower ends of the two connecting plates in the first suspension arm are provided with first through holes and are positioned between the two first lug plates; the first connecting piece is rotatably arranged in the first through holes on the two connecting plates in a penetrating way;

the lower ends of the two connecting plates in the second suspension arm are provided with second through holes and are positioned between the two second lug plates; the second connecting piece is rotatably arranged in the second through holes on the two connecting plates in a penetrating way.

6. The load testing apparatus for a bridge crane according to claim 5, wherein each of said lifting lugs further comprises two first lower clamping plates;

the two first ear plates are provided with first mounting holes which are coaxially arranged with the first through holes;

the first connecting piece comprises a first head part and a first rod part, the first head part is positioned on the outer side of one of the first lug plates, and the first rod part is arranged in the two first mounting holes and the two first through holes in a penetrating manner and extends out of the outer side of the other first lug plate;

the part of the first rod part extending out of the other first lug plate is provided with two first lower clamping grooves which are arranged at intervals in the circumferential direction;

the first lower clamping plates are correspondingly clamped in the first lower clamping plates one by one and connected with the other first ear plate.

7. The load testing apparatus for a bridge crane according to claim 5, wherein each of said lifting lugs further comprises two second lower clamping plates;

the two second ear plates are provided with second mounting holes which are coaxially arranged with the second through holes;

the second connecting piece comprises a second head part and a second rod part, the second head part is positioned on the outer side of one of the second ear plates, and the second rod part is arranged in the two second mounting holes and the two second through holes in a penetrating manner and extends out of the outer side of the other second ear plate;

the part of the second rod part extending out of the other second lug plate is provided with two second lower clamping grooves which are arranged at intervals in the circumferential direction;

the second lower clamping plates are correspondingly clamped in the second lower clamping plates one to one and connected with the other second ear plate.

8. The load testing apparatus for a bridge crane according to claim 1, wherein the reinforcing plate is provided in plurality at intervals;

and an abdicating space for the hook to pass through is arranged between the fastener and the two connecting plates in each suspension arm and the reinforcing plate close to the fastener.

9. A load testing apparatus for a bridge crane according to claim 1 wherein said included angle is acute or obtuse.

10. A load testing apparatus for a bridge crane as claimed in claim 1, wherein said two lifting lugs are symmetrically disposed and respectively disposed at the middle of two opposite side edges of the top of said weight platform.

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