Dynamic simulation test method for load-limiting chain hoist

Abstract

The invention discloses a dynamic simulation test method for a load-limiting chain hoist, wherein a special test device comprises a weight sensor and a connecting frame; the connecting frame of the sensor comprises a connecting plate, an upper hanging plate and a lower hanging plate; the sensor passes through the lower hanging plate and is supported in a through hole of the connecting plate; the upper end of a lifting boom is fixed with a lifting ring and the lower section is sequentially fixed with balance levers and weights; the balance levers are equipped with elastic pressure-bearing auxiliary weight assemblies in a symmetrical manner; each of the assemblies is composed of a compression spring positioning rod, a compression spring and a compression spring seat; and the compression spring seat corresponds to the ground beam. The test method comprises the following steps of taking a hoist with a rated lifting capacity of 1t and hanging the hoist on the device, taking two components,a balance lever and two weights whose weight sum is equal to 1.25 times the rated lifting capacity, starting the test pull motor in the forward direction to lift 300mm with load and have qualified dynamic load performance test, further making the compression spring seat contact the balance levers until the hoist slips, and displaying that the weight sensing controller is greater than or equal to 1.3t, thereby passing the load-limiting performance test. The method provided by the invention can dynamically simulate lifting load, and dynamically loading and pressing loading and limiting performance test.

Description

【Technical field】 [0001] The invention relates to a dynamic simulation test method of a load-limited chain hoist, belonging to the technical field of dynamic load and load-limit simulation tests of a load-limited chain hoist. 【Background technique】 [0002] As the name suggests, the load limiter is called an overload limiter. Once an accident occurs when the hoist is overweight, it will directly endanger the life safety of the operator and property loss. According to the requirements of the safety regulations for lifting machinery, the hoist should be equipped with a load limiter to ensure operation. Safety. [0003] Taking a chain hoist with a rated lifting capacity of one ton as an example, according to the technical requirements of the industry, the dynamic load test load and limit load value are 1.25 tons (t) and 1.3t~1.6t respectively. Specifically, when the chain hoist is suspended with a test load of 1.25 tons, it can be lifted and lowered normally; Ensure that the ...

AI Technical Summary

Problems solved by technology

[0006] The advantages of the hanging ball method are: the static test method is simple and easy to implement, but since the upper and lower hanging points are dead points, there is no load lifting displacement, and it can only roughly measure the limited load capacity of the load-limited chain hoist, which is not enough. The reason for the accuracy is that the load-limiting force is easily affected by the rotation angle of the lifting sprocket and the lifting chain, as well as the degree of engagement between the ratchet wheel and the pawl in the load-limiting hand chain hoist.

[0007] In addition, hydraulic methods are also used in the industry to test load-limiting hand chain hoists, but the load-limiting capacity is easily affected by hydraulic oil flow control and oil temperature changes.

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