CN218444496U

CN218444496U - Load test device for casting bridge crane

Info

Publication number: CN218444496U
Application number: CN202222271256.9U
Authority: CN
Inventors: 袁晓峰
Original assignee: Wisdri Engineering and Research Incorporation Ltd
Current assignee: Wisdri Engineering and Research Incorporation Ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2023-02-03
Anticipated expiration: 2032-08-26

Abstract

The utility model discloses a load test device of a cast bridge crane, which is based on the prior flat-plate metallurgical vehicle, and a pair of hoisting components are arranged on two sides of the middle part of the top surface of the flat-plate metallurgical vehicle; the hoisting assembly comprises two supports fixed on the flat plate type metallurgical vehicle and two detachable hoisting arms, the lower ends of the two hoisting arms are respectively connected with the two supports through lower pin shafts, the upper ends of the two hoisting arms are connected together through upper pin shafts, the two hoisting arms and the two supports form an isosceles triangle, and each hoisting arm comprises two plates and reinforcing rib plates which are distributed and connected between the two plates; the distance between the upper pin shafts of the hoisting assemblies on the two sides is the same as that between hoisting points of a gantry hook of the cast bridge crane, and the gantry hook can smoothly hoist the upper pin shafts from between the two plates; a square billet placing platform is arranged between the hoisting assemblies on the two sides of the flat plate type metallurgical vehicle. The device utilizes the square billet as a weight substitute, and has low cost, safety and reliability.

Description

Load test device for casting bridge crane

Technical Field

The utility model relates to a hoist load test, concretely relates to cast bridge crane load test device.

Background

As the converter of the steelmaking workshop is enlarged more and more, the tonnage of a casting bridge crane matched with the converter steelmaking workshop is also enlarged more and more, for example, the tonnage of a casting bridge crane of a 150t converter steelmaking workshop feeding span and a molten steel receiving span is 280-300t, and the tonnage of a casting bridge crane of a 210t converter steelmaking workshop feeding span and a molten steel receiving span is 350-380t.

According to the regulations of GB 6067-2014 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 as to verify the reliability of the hoisting machinery and ensure safe and reliable operation in the use process.

For a long time, because standard weights are difficult to transport to the site when a load test is carried out in installation acceptance and supervision and inspection of hoisting machinery, a continuous casting billet is generally adopted as a weight substitute for carrying out the test in a steel mill. 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 square billets (common section size 150X150 mm) ² ) At least hundreds of square billets are needed to meet the weight requirement required by the load test, how to effectively fix the numerous square billets becomes a troublesome problem, and once the square billets are not properly treated, serious safety accidents are easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a cast bridge crane load test device, the device utilize the square billet as the weight substitute, and are with low costs, safe and reliable.

The utility model adopts the technical proposal that:

a load test device of a cast bridge crane is based on the existing flat-plate type metallurgical vehicle, and a pair of hoisting assemblies are arranged on two sides of the middle part of the top surface of the flat-plate type metallurgical vehicle; the hoisting assembly comprises two supports fixed on the flat plate type metallurgical vehicle and two detachable hoisting arms, the lower ends of the two hoisting arms are respectively connected with the two supports through lower pin shafts, the upper ends of the two hoisting arms are connected together through upper pin shafts, the two hoisting arms and the two supports form an isosceles triangle, and each hoisting arm comprises two plates and reinforcing rib plates which are distributed and connected between the two plates; the distance between the upper pin shafts of the hoisting assemblies at the two sides is the same as the distance between the hoisting points of the gantry hook of the bridge casting crane, and the gantry hook can smoothly hoist the upper pin shafts between the two plates; a square billet placing platform is arranged between the hoisting assemblies on the two sides of the flat plate type metallurgical vehicle.

Preferably, in the same hoisting assembly, the two plates of the two booms are staggered at the upper end and positioned in the double-lug support at the lower end.

Preferably, the upper pin shaft and the lower pin shaft are provided with clamping plates on the outer circle with one end being an expanding plate and the other end being close to the outer circle, and the clamping plates are fixed through bolts.

Preferably, 45# steel is adopted for the upper pin shaft and the lower pin shaft.

The utility model has the advantages that:

the device utilizes the existing flat plate type metallurgical vehicle as a square billet placing platform, only needs to be additionally provided with a pair of hoisting assemblies, and has low cost; the device adopts a pair of hoisting assemblies, has better balance performance, and ensures the safety and reliability of the test process; the device utilizes the square billet as weight substitute, and the back billet can recycle after the experiment finishes.

Drawings

Fig. 1 is a top view of load test device of a casting bridge crane in the embodiment of the present invention.

Fig. 2 isbase:Sub>A cross-sectional view atbase:Sub>A-base:Sub>A in fig. 1.

Fig. 3 is a cross-sectional view at B-B in fig. 1.

In the figure: 1-flat plate type metallurgical vehicle; 2-hoisting the assembly; 21-a support; 22-a boom; 221-two plates; 222-reinforcing rib plates; 23-lower pin shaft; 24-upper pin shaft; 241-an expansion plate; 242-card; 3, gantry hook; 4-square billet;

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

As shown in fig. 1 to 3, a load test device of a casting bridge crane is based on a conventional flat plate type metallurgical vehicle 1, wherein a pair of hoisting assemblies 2 are arranged on two sides of the middle part of the top surface of the flat plate type metallurgical vehicle 1; the hoisting assembly 2 comprises two supports 21 fixed on the flat plate type metallurgical vehicle 1 and two detachable hoisting arms 22, the lower ends of the two hoisting arms 22 are respectively connected with the two supports 21 through lower pin shafts 23, the upper ends of the two hoisting arms are connected together through upper pin shafts 24, the two hoisting arms 22 and the two supports 21 form an isosceles triangle, and each hoisting arm 22 comprises two plates 221 and reinforcing rib plates 222 which are distributed and connected between the two plates 221; the distance between the upper pin shafts 24 of the hoisting assemblies 2 at the two sides is the same as the distance between the hoisting points of the gantry hook 3 of the bridge casting crane, and the gantry hook 3 can smoothly hoist the upper pin shafts 24 from between the two plates 221; a square billet 4 placing platform is arranged between the hoisting assemblies 2 on the two sides of the flat plate type metallurgical vehicle 1.

In the present embodiment, as shown in fig. 3, in the same lifting assembly 2, the two plates 221 of the two booms 22 are staggered at the upper end and located in the double-lug support 21 at the lower end.

As shown in fig. 3, in the present embodiment, the upper pin 24 has an enlarged plate 241 at one end and a clamping plate 242 clamped on the outer circle near the other end, and the clamping plate 242 is fixed by a bolt; the mounting structure of the lower pin 23 is the same.

In the present embodiment, 45# steel is used for the upper pin shaft 24 and the lower pin shaft 23.

When the load test device of the cast bridge crane is used for testing, the first step is as follows: firstly, calculating the weight of a single standard square billet 4 according to the section size and the length size of the square billet 4, and then determining the quantity of the square billets 4 required according to the requirements of 1 time, 1.1 time and 1.25 times of rated load of the trial weight of a casting bridge crane; the second step is that: conveying a corresponding number of square billets 4 to a trial-and-error site, loading the square billets 4 onto a square billet 4 placement platform of the flat plate type metallurgical vehicle 1 by using a crane clamp and making a record, and if the hoisting assembly 2 interferes with the placement of the square billets 4, firstly unloading the hoisting assembly 2; the third step: carrying out a 1-time rated static load test and a 1.25-time rated static load test, firstly starting a lifting mechanism, carrying out an empty load lifting operation, and enabling the trolley to run back and forth on the full stroke, wherein the no-load test running is not less than three times and no abnormal phenomenon is caused, then stopping the trolley at the midspan of the bridge crane, descending the gantry hook 3, winding the hook tip around the lower edge of the upper pin shaft 24, horizontally moving the gantry hook 3, after the upper pin shaft 24 is hooked, vertically lifting 1-time rated load of the rated lifting load, enabling the trolley to run back and forth on the full stroke of the bridge frame for a plurality of times, wherein each part is free from abnormal phenomenon, the bridge frame structure is free from abnormal phenomenon after unloading, then stopping the trolley in the midspan of the bridge crane, lifting the load 1.25 times of the rated lifting load without impact, stopping time is not less than 10min at the position 100-200 mm away from the ground, and no unstable phenomenon is caused, finally unloading the trolley to be opened to the end of the bridge, and various checks are carried out according to the specified requirements; the fourth step: the dynamic load test of the crane is carried out, the main trolley is firstly stopped in the midspan, the gantry hook 3 descends, the hook tip bypasses the lower edge of the upper pin shaft 24, the gantry hook 3 is horizontally moved to vertically lift a load which is 1.1 times of the rated load lifting capacity after hooking the upper pin shaft 24 for carrying out the lifting test operation, then the crane cart runs once in the whole process, and various checks are carried out according to the specified requirements.

The device utilizes the existing flat plate type metallurgical vehicle 1 as a square billet 4 placing platform, only needs to be additionally provided with a pair of hoisting assemblies 2, and has low cost; the device adopts a pair of hoisting components 2, has better balance performance, and ensures the safety and reliability of the test process; the device utilizes square billet 4 as weight substitute, and the back base can recycle after the experiment finishes.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.

Claims

1. The utility model provides a cast bridge crane load test device which characterized in that: based on the existing flat plate type metallurgical vehicle, a pair of hoisting assemblies are arranged on two sides of the middle part of the top surface of the flat plate type metallurgical vehicle; the hoisting assembly comprises two supports fixed on the flat plate type metallurgical vehicle and two detachable hoisting arms, the lower ends of the two hoisting arms are respectively connected with the two supports through lower pin shafts, the upper ends of the two hoisting arms are connected together through upper pin shafts, the two hoisting arms and the two supports form an isosceles triangle, and each hoisting arm comprises two plates and reinforcing rib plates which are distributed and connected between the two plates; the distance between the upper pin shafts of the hoisting assemblies at the two sides is the same as the distance between the hoisting points of the gantry hook of the bridge casting crane, and the gantry hook can smoothly hoist the upper pin shafts between the two plates; a square billet placing platform is arranged between the hoisting assemblies on the two sides of the flat plate type metallurgical vehicle.

2. The cast bridge crane load testing apparatus of claim 1, wherein: in the same hoisting assembly, two plates of two hoisting arms are staggered at the upper ends and positioned in double-lug supports at the lower ends.

3. The cast bridge crane load testing apparatus of claim 1, wherein: the upper pin shaft and the lower pin shaft are provided with clamping plates which are clamped on the outer circle near the other end and one end of each clamping plate is an expanding plate, and the clamping plates are fixed through bolts.

4. The cast bridge crane load testing apparatus of claim 1, wherein: the upper pin shaft and the lower pin shaft are made of 45# steel.