A chain hoist load test device and load test method

Abstract

The present invention discloses a chain hoist load test device, comprising a weight and a pit for placing the weight, wherein a weight support is provided at the bottom of the pit, the middle portion of the weight support comprises a positioning rod arranged upward, and the middle portion of the weight is provided with a positioning hole adapted to the positioning rod. The present invention also discloses a load test method, which specifically comprises the following steps: (1) 0.5t chain hoist load test; (2) 1t chain hoist load test; (3) 2t chain hoist load test. In the present invention, the load test can realize 0.5t, 1t, and 2t chain hoist load tests by switching different lifting points, with high weight utilization rate, simple operation, and high work efficiency. Since the test weight is arranged in the pit, the safety factor is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of load testing equipment and testing technology for lifting machinery, and in particular to a load testing device and a load testing method for a chain hoist. Background Art

[0002] Electric hoists are generally installed on single-beam cranes, bridge cranes, gantry cranes, and suspension cranes. It is mainly composed of a reducer, a lifting motor, a running motor, a fire breaker, a cable slide, a drum device, a hook device, a coupling, a soft cable current introducer, etc., which integrates power and braking force. Before the electric hoist is put into use, in order to prevent accidents, the electric hoist must be subjected to a load test.

[0003] Chain hoist is a kind of light and small lifting equipment commonly used in indoor operations. It has small size, light weight, advanced structure and reliable performance. The main procedures of chain hoist load test are:

[0004] 1. Lifting weight is 1.3 times of rated load and lifting is normal;

[0005] 2. When hoisting a weight 1.35 times the rated load, it will slip.

[0006] The traditional test method for chain hoists is to equip them with weights 1.3 times and 1.35 times the rated load of all tonnage hoists, and select the corresponding weights according to the tonnage for lifting tests. This method has a wide variety of weights, low weight utilization, high cost investment, and a cumbersome lifting process, low operating efficiency, and a high risk factor. Summary of the invention

[0007] The object of the present invention is to provide a chain hoist load testing device to solve the above problems.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A chain hoist load test device comprises a weight and a pit for placing the weight, a weight support is provided at the bottom of the pit, a positioning rod arranged upward in the middle of the weight support, and a positioning hole matched with the positioning rod is provided in the middle of the weight.

[0010] Preferably, a pit cover is provided on the top of the pit, the pit cover is provided with four lifting holes, and the weight of the pit cover is 0.05t.

[0011] Preferably, the weights include fixed weights and portable weights, the fixed weights include a 1.3t fixed weight, a 0.65t fixed weight and a 0.6t fixed weight, and the portable weights include four 0.025t portable weights.

[0012] Preferably, the order in which the fixed weights are set on the positioning rod is, from bottom to top, 1.3t fixed weights, 0.65t fixed weights, and 0.6t fixed weights.

[0013] Preferably, the fixed weight comprises two symmetrically arranged lifting lugs, and the lifting lug of the 1.3 t fixed weight is staggered by 90° from the lifting lugs of the 0.65 t fixed weight and the 0.6 t fixed weight.

[0014] Preferably, a cushion block is provided at the bottom of the weight base.

[0015] Preferably, a protective ring is provided on the inner wall of the pit.

[0016] A load test method using a chain hoist load test device specifically comprises the following steps:

[0017] (1) 0.5t chain hoist load test: before lifting, remove the hand weight, lift the 0.6t fixed weight lifting lug, and lift it together with the pit cover, that is, the lifting weight is 0.65t; then put a 0.025t hand weight on the positioning rod, lift the 0.6t fixed weight lifting lug, and lift it together with the pit cover and a 0.025t hand weight, that is, the lifting weight is 0.675t;

[0018] (2) 1 t chain hoist load test: before lifting, remove the hand weight, lift the 0.65 t fixed weight lifting lug, and lift the pit cover together, that is, the lifting weight is 1.3 t; then put two 0.025 t hand weights on the positioning rod, lift the 0.65 t fixed weight lifting lug, and lift the pit cover and two 0.025 t hand weights together, that is, the lifting weight is 1.35 t;

[0019] (3) 2 t chain hoist load test: before lifting, remove the hand weight first, lift the 1.3 t fixed weight lifting lug, and lift the whole pit cover together, that is, the lifting weight is 2.6 t; then put four 0.025 t hand weights on the positioning rod, lift the 1.3 t fixed weight lifting lug, and lift the whole pit cover and four 0.025 t hand weights together, that is, the lifting weight is 2.7 t.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The chain hoist load test device of the present invention can meet the load requirements of chain hoists of various tonnages by combining different weights, thereby reducing the cost investment. The weights are integrated together through positioning rods and uniformly placed in the pit, thereby improving space utilization.

[0022] 2. The fixed weights in the chain hoist load test device of the present invention are placed in order, and there is no need to replace the fixed weights or change the position of the fixed weights during use, which greatly shortens the load test time and saves labor.

[0023] 3. The chain hoist load test device of the present invention includes a pit cover with four lifting holes. The pit cover can play a safety protection role when not in use. When in use, the lifting rope is passed into the pit through the lifting holes, and there is no need to move the pit cover, which improves the use efficiency and saves labor.

[0024] 4. The load test in the present invention can realize 0.5t, 1t, and 2t chain hoist load tests by switching different lifting points, with high weight utilization, simple operation, and high work efficiency. Since the test weights are arranged in the pit, the safety factor is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a chain hoist load test device in the present invention;

[0026] Figure 2 yes Figure 1 Sectional view at AA in the middle;

[0027] Figure 3 yes Figure 1 Top view of the .

[0028] As shown in the figure: 1-pad, 2-1.3t fixed weight, 3-0.65t fixed weight, 4-0.6t fixed weight, 5-protective ring, 6-pit cover, 7-portable weight, 8-weight base, 801-positioning rod, 9-pit, 10-lifting ear, 11-lifting hole, 12-positioning hole. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0030] For the load test of 0.5t, 1t and 2t chain hoists, the load required for the test is shown in the following table:

[0031] Serial number Rated load 1.3 times load 1.35 times load 1 0.5t 0.65 t 0.675 t 2 1 t 1.3 t 1.35 t 3 2 t 2.6 t 2.7 t

[0032] From the above table, we can see that the load tests of 0.5t, 1t and 2t chain hoists require lifting six weights of 0.65t, 0.675t, 1.3t, 1.35t, 2.6t and 2.7t to complete the load test.

[0033] like Figure 1-3As shown, a chain hoist load test device includes a weight and a pit 9 for placing the weight. The inner wall of the pit 9 is provided with a protective ring 5, which can play a buffering role to reduce the damage to the pit wall caused by the collision of the weight with the pit wall when moving up and down.

[0034] A cushion block 1 is provided at the bottom of the pit 9 , a weight base 8 is provided on the cushion block 1 , the weight base 8 includes a positioning rod 801 arranged upward in the middle, and a positioning hole matched with the positioning rod 801 is provided in the middle of the weight.

[0035] A pit cover 6 is provided on the top of the pit 9. The pit cover 6 is provided with four lifting holes 11. The weight of the pit cover 6 is 0.05 t. After the pit cover 6 is covered, it is not only neat and beautiful, but also can prevent people from falling into the pit, which is safe and reliable.

[0036] The weights include fixed weights and portable weights. The fixed weights include a 1.3t fixed weight 2, a 0.65t fixed weight 3 and a 0.6t fixed weight 4. The portable weight 7 includes four 0.025t portable weights. The fixed weights are sleeved on the positioning rod 801 in the order from bottom to top: 1.3t fixed weight 2, 0.65t fixed weight 3, 0.6t fixed weight 4.

[0037] The fixed weights include two symmetrically arranged lifting lugs 10. The lifting lugs 10 of the 1.3t fixed weight 2 are staggered by 90° from the lifting lugs 10 of the 0.65t fixed weight 3 and the 0.6t fixed weight 4. This structure facilitates the operation of connecting the lifting rope and finding the lifting lugs.

[0038] A load test method using a chain hoist load test device, the specific steps are as follows:

[0039] (1) 0.5 t chain hoist load test: Before lifting, remove the hand weight 7, put the lifting rope into the pit through the lifting hole, lift the 0.6 t fixed weight 4 lifting lug 10, and lift it together with the pit cover 6, that is, the lifting weight is 0.65 t; then put a 0.025 t hand weight 7 on the positioning rod 801, lift the 0.6 t fixed weight 4 lifting lug 10, and lift it together with the pit cover 6 and a 0.025 t hand weight 7, that is, the lifting weight is 0.675 t.

[0040] (2) 1 t chain hoist load test: Before lifting, remove the hand weight 7, put the lifting rope into the pit through the lifting hole, lift the 0.65 t fixed weight 3 lifting lug 10, and lift it together with the pit cover 6, that is, the lifting weight is 1.3 t; then put two 0.025 t hand weights 7 on the positioning rod 801, lift the 0.65 t fixed weight 3 lifting lug 10, and lift it together with the pit cover 6 and the two 0.025 t hand weights 7, that is, the lifting weight is 1.35 t.

[0041] (3) 2 t chain hoist load test: Before lifting, remove the hand weight 7, put the lifting rope into the pit through the lifting hole, lift the 1.3 t fixed weight 2 lifting lug 10, and lift it together with the pit cover 6, that is, the lifting weight is 2.6 t; then put four 0.025 t hand weights 7 on the positioning rod 801, lift the 1.3 t fixed weight 2 lifting lug 10, and lift it together with the pit cover 6 and the four 0.025 t hand weights 7, that is, the lifting weight is 2.7 t.

[0042] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A chain hoist load test method, characterized in that: Based on the implementation of the chain hoist load test device, the chain hoist load test device includes weights and a pit for placing the weights, a weight base is provided at the bottom of the pit, the middle part of the weight base includes a positioning rod set upward, and the middle part of the weight is provided with a positioning hole matched with the positioning rod; a pit cover is provided on the top of the pit, and the pit cover is provided with four hoisting holes and a positioning hole matched with the positioning rod, and the weight of the pit cover is 0.05t; the weights include fixed weights and portable weights, the fixed weights include a 1.3t fixed weight, a 0.65t fixed weight and a 0.6t fixed weight, and the portable weights include 4 0.025t portable weights; the order in which the fixed weights are set on the positioning rod is 1.3t fixed weight, 0.65t fixed weight, and 0.6t fixed weight from bottom to top; the fixed weight includes two symmetrically arranged hoisting ears, The lifting lugs of the 1.3t fixed weight are staggered 90° from the lifting lugs of the 0.65t fixed weight and the 0.6t fixed weight; a cushion block is provided at the bottom of the weight support; a protective ring is provided on the inner wall of the pit; The load test method is implemented by the following steps: (1) 0.5t chain hoist load test: before lifting, remove the hand weight, lift the 0.6t fixed weight lifting lug, and lift it together with the pit cover, that is, the lifting weight is 0.65t; then put a 0.025t hand weight on the positioning rod, lift the 0.6t fixed weight lifting lug, and lift it together with the pit cover and a 0.025t hand weight, that is, the lifting weight is 0.675t; (2) 1 t chain hoist load test: before lifting, remove the hand weight, lift the 0.65 t fixed weight lifting lug, and lift the pit cover together, that is, the lifting weight is 1.3 t; then put two 0.025 t hand weights on the positioning rod, lift the 0.65 t fixed weight lifting lug, and lift the pit cover and two 0.025 t hand weights together, that is, the lifting weight is 1.35 t; (3) 2 t chain hoist load test: before lifting, remove the hand weight first, lift the 1.3 t fixed weight lifting lug, and lift the whole pit cover together, that is, the lifting weight is 2.6 t; then put four 0.025 t hand weights on the positioning rod, lift the 1.3 t fixed weight lifting lug, and lift the whole pit cover and four 0.025 t hand weights together, that is, the lifting weight is 2.7 t.

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