Dynamic simulation test method for load-limited chain hoists

Abstract

The invention discloses a dynamic simulation test method of a load-limited chain block. The special test device includes a weight sensor and a connecting frame. The sensor connecting frame includes a connecting plate, an upper hanging plate and a lower hanging plate. In the through hole of the connecting plate, the upper end of the lifting suspender is fixed to the lifting ring, and the lower part is fixed to the balance lever and the weight in turn. The balance lever is symmetrically installed with elastic pressure-bearing auxiliary weight components. Each component is composed of a compression spring positioning rod, a compression spring and a compression spring seat. , the compression spring seat corresponds to the ground beam; the steps are as follows: take a gourd with a rated lifting capacity of 1t and hang it on the device, take two components whose total weight is equal to 1.25 times the rated lifting capacity, a balance lever and two weights, Start the test pulling motor to rotate forward, it can lift 300mm with load, and the dynamic load performance test is qualified. Further, the pressure spring seat is in contact with the balance lever until the hoist slips, and the weight sensor controller shows ≥1.3t, passing the load limit performance test. The invention can dynamically simulate hoisting, dynamic load pressurization and sequential dynamic and load-limiting performance tests.

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 ...

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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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