A test method of a tensile testing machine

Abstract

The invention provides a testing method of a tension testing machine; the tension testing machine comprises a bracket and a testing assembly; the testing assembly comprises a wheel assembly, a first driving oil cylinder, a second driving oil cylinder and a connecting device; the connecting device is used to connect the testing object; a steel wire rope is wound around a first movable pulley, a pulley assembly, the testing object and a second movable pulley, and one end of the steel wire rope is connected to a first fixed part; the other end of the steel wire rope is connected to a second fixed part; the steel wire rope is pre-tightened by driving the first movable pulley by the first oil cylinder; a tension test is performed by driving the second movable pulley by the second oil cylinder; before performing the tension test, the steel wire rope is pre-tightened to avoid the situation that the length of the steel wire rope exceeds the stroke of the second oil cylinder when the length of the steel wire rope is contracted, resulting in the inability to perform the tension test.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing large crane test devices, and in particular to a test method of a tensile testing machine. Background Art

[0002] The pulley device is an active component and needs to be tested for its load-bearing capacity. The patent document No. 201611072442.2 in China and published on May 10, 2017 discloses a large-load test device, which includes a base, which is connected to a beam through a column, a guide pulley and a rope-winding pulley block with a steel wire rope are provided on the top of the beam, a connecting rod is hinged on the base below the rope-winding pulley block, and a pin is installed on the through hole at the front end of the connecting rod; a fixed connecting end for connecting to one rope end of the steel wire rope and a loading cylinder are hinged on the base, and the loading cylinder is provided with a movable connecting end for connecting to the other rope end of the steel wire rope at the end of the piston rod.

[0003] However, the test device cannot pre-tighten the wire rope. When the wire rope contracts and exceeds the stroke of the loading cylinder, the tension test cannot be performed. Summary of the invention

[0004] The invention provides a testing method of a tension testing machine, which can pre-tighten a steel wire rope and simultaneously convert the tension generated on an object to be tested into the supporting force of a bracket.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a testing method of a tensile testing machine, the tensile testing machine includes a bracket and a testing assembly; the bracket includes a base, a beam and a column assembly; the beam is located above the base, and the column assembly is arranged between the beam and the base; the column assembly includes a first column and a second column; the first column and the second column are each provided with more than two; the first column is close to one end of the beam and the base; the second column is close to the other end of the beam and the base.

[0006] The test assembly includes a pulley assembly, a first driving oil cylinder, a second driving oil cylinder and a connecting device; the pulley assembly is arranged on the crossbeam; the pulley assembly includes a first guide pulley, a second guide pulley and a rope winding pulley group; the rope winding pulley group includes five rope winding pulleys;

[0007] A connecting device is arranged on the base and extends toward the crossbeam; the connecting device is used for installing the object to be detected; a first driving oil cylinder is arranged at one end of the base and is located between the two first columns; a second driving oil cylinder is arranged at the other end of the base and is located between the two second columns; a first fixing part is provided at one end of the crossbeam close to the first driving oil cylinder; a second fixing part is provided at one end of the crossbeam close to the second driving oil cylinder; a first movable pulley is connected to the movable end of the first driving oil cylinder; a second movable pulley is connected to the movable end of the second driving oil cylinder; the object to be detected is an object to be detected having four pulleys; a steel wire rope is wound around the first movable pulley, the rope winding pulley, the pulley of the object to be detected and the second movable pulley; one end of the steel wire rope is connected to the first fixing part; the other end of the steel wire rope is connected to the second fixing part; the steel wire rope and the connecting device produce a pulling force in the opposite direction to the object to be detected.

[0008] The test method of the tensile testing machine includes the following steps:

[0009] (1). Install the object to be tested;

[0010] (2) The first cylinder and the second cylinder extend;

[0011] (3) The wire rope is wound around the first movable pulley, the first guide pulley, the rope winding pulley assembly, the pulley block, the second guide pulley and the second movable pulley;

[0012] (4) The first oil cylinder retracts the pre-tightened wire rope; when the wire rope is pre-tightened, proceed to step (5);

[0013] (5) The second cylinder retracts to carry out a tensile test on the test object.

[0014] In the above method, the object to be inspected is first installed, and then the first oil cylinder and the second oil cylinder are extended; the distance between the first movable pulley, the second movable pulley and the rope winding pulley group is shortened to facilitate the rope winding of the wire rope; when the wire rope is wound, the first oil cylinder retracts the pre-tightened wire rope, so as to avoid the length of the wire rope exceeding the stroke of the second oil cylinder when it shrinks, resulting in the inability to perform the tensile test; then the tensile test is performed on the object to be inspected by retracting the second oil cylinder; at the same time, since the wire rope generates tension on the object to be inspected; the connecting device also generates tension on the object to be inspected; the wire rope and the connecting device generate tension in opposite directions on the object to be inspected; when the two tensions interact with each other, they will be converted into a force to stabilize the bracket; thereby achieving stable support for the bracket; when using the tensile testing machine in this way, there is no need to fix the tensile testing machine on the ground, but only need to place the tensile testing machine on the ground to carry out the tensile test.

[0015] Furthermore, step (3) is specifically as follows: first connect one end of the wire rope to the first fixed part; then, after the wire rope is sequentially wound around the first movable pulley, the first guide pulley, a rope winding pulley, a pulley pulley, another rope winding pulley, another pulley pulley, another rope winding pulley, another pulley pulley, another rope winding pulley, another pulley pulley, the last rope winding pulley, the second guide pulley, and the second movable pulley, the other end of the wire rope is connected to the second fixed part.

[0016] Furthermore, step (5) is specifically as follows: the second oil cylinder is retracted; the steel wire rope generates a pulling force on the object to be detected to drive the object to be detected to move upward, and a force is generated between the connecting device and the object to be detected to offset the upward movement of the object to be detected; and then a tensile test is performed on the object to be detected.

[0017] Furthermore, step (5) also includes: the steel wire rope and the connecting device generate tension in opposite directions on the object to be detected; when the two tensions interact with each other, they are converted into a force to stabilize the bracket; thereby achieving stable support for the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the connection between the tensile testing device of the present invention and the pulley device.

[0019] Figure 2 for Figure 1 Enlarged view of a.

[0020] Figure 3 It is a left side view of the connection between the tensile testing device of the present invention and the pulley device.

[0021] Figure 4 It is a right side view of the connection between the tensile testing device of the present invention and the pulley device.

[0022] Figure 5 It is a schematic diagram of using the tensile testing device of the present invention to perform a tensile test on a pulley device.

[0023] Figure 6 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1-6As shown; a test method of a tensile testing machine; the tensile testing machine includes a bracket and a test assembly; the bracket includes a base 11, a beam 12 and a column assembly; the beam 12 is located above the base 11, and the column assembly is arranged between the beam 12 and the base 11; the column assembly includes a first column 13 and a second column 14; the first column 13 and the second column 14 are each provided with more than two; in this embodiment, the first column 13 and the second column 14 are each provided with two. The first column 13 is close to one end of the beam 12 and the base 11; the second column 14 is close to the other end of the beam 12 and the base 11.

[0026] The test assembly includes a pulley assembly, a first driving cylinder 22 , a second driving cylinder 23 and a connecting device 24 ; the pulley assembly is arranged on the cross beam 12 ; the connecting device 24 is arranged on the base 11 and extends toward the cross beam 12 .

[0027] The connecting device 24 is used to install the object to be detected; in this embodiment, the object to be detected is the pulley device 3; the connecting device 24 is detachably connected to the pulley device 3; the connecting device 24 is a connecting support; the end of the connecting support away from the base 11 is provided with a first through hole (not shown in the figure). A pulley pulley block 31 is provided at one end of the pulley device 3, and a second through hole (not shown in the figure) is provided at the other end of the pulley device 3; before the tensile test, a pin 4 is used to penetrate the first through hole and the second through hole; the pulley device 3 and the connecting device 24 are hinged.

[0028] The first driving cylinder 22 is arranged at one end of the base 11 and is located between the two first columns 13; the second driving cylinder 23 is arranged at the other end of the base 11 and is located between the two second columns 14; a first fixing portion 121 is provided at one end of the beam 12 close to the first driving cylinder 22; a second fixing portion 122 is provided at one end of the beam 12 close to the second driving cylinder 23; the movable end of the first driving cylinder 22 is connected to the first movable pulley 221; the movable end of the second driving cylinder 23 is connected to the second movable pulley 231.

[0029] The pulley assembly includes a first guide pulley 211, a second guide pulley 213 and a rope winding pulley group 212; the rope winding pulley group 212 includes more than two rope winding pulleys 214; in this embodiment, there are five rope winding pulleys 214. The pulley block 31 is provided with four pulley pulleys 32. A steel wire rope 5 is provided around the first movable pulley 221, the first guide pulley 211, the second guide pulley 213, the rope winding pulley group 212, the pulley block 31 and the second movable pulley 231; one end of the steel wire rope 5 is connected to the first fixing portion 121; the other end of the steel wire rope is connected to the second fixing portion 122.

[0030] A tensile test space 6 is formed between the crossbeam 12, the base 11, the first column 13 and the second column 14; the base 11, the crossbeam 12, the first column 13 and the second column 14 all have one or more supporting parts 7 extending toward the tensile test space 6. The supporting parts are provided to support the supporting plate; when the tensile testing machine is placed horizontally for use, the supporting plate is placed on the supporting parts, so that walking on the tensile testing machine can be achieved. Adjacent supporting parts 7 are arranged around the tensile test space 6. In this way, the support of the supporting plate is stable. One or more mounting holes 71 are provided on the supporting part 7; in the present embodiment, the mounting holes are threaded holes; when the supporting plate needs to be installed, bolts are passed through the supporting plate and threadedly connected to the mounting holes. By providing mounting holes, the supporting plate can be stably mounted on the supporting part.

[0031] In this embodiment, a first support portion 81 is protruded from the bottom of the base 11 in a direction away from the cross beam 12; a second support portion 82 is protruded outwardly from one side of the base 11 and the cross beam 12. By providing the first support portion 81, when the tensile testing machine is used vertically, the first support portion 81 is used to contact the ground, thereby reducing the wear on the tensile testing machine. By providing the second support portion 82, when the tensile testing machine is used horizontally, the second support portion 82 is used to contact the ground, thereby reducing the wear on the tensile testing machine.

[0032] The steel wire rope is arranged on the first movable pulley 221, the pulley assembly and the second movable pulley 231, and one end of the steel wire rope is connected to the first fixed part 121; the other end of the steel wire rope is connected to the second fixed part 122; the first movable pulley 221 is driven by the first oil cylinder to pre-tighten the steel wire rope; the second movable pulley 231 is driven by the second oil cylinder to perform a tension test; before the tension test, the steel wire rope is pre-tightened to avoid the situation that the length of the steel wire rope exceeds the stroke of the second oil cylinder when it shrinks, resulting in the inability to perform the tension test. At the same time, since the steel wire rope generates tension on the pulley device; the connecting device also generates tension on the pulley device; the steel wire rope and the connecting device generate tension in opposite directions on the pulley device; when the two tensions interact with each other, they will be converted into a force to stabilize the bracket; thereby achieving stable support for the bracket; in this way, when using the tension tester, there is no need to fix the tension tester on the ground, but only need to place the tension tester on the ground to carry out the tension test.

[0033] The test method of the tensile testing machine includes the following steps:

[0034] (1) Install the pulley device.

[0035] (2) The first cylinder and the second cylinder extend.

[0036] (3) The wire rope is wound around the first movable pulley, the first guide pulley, the rope winding pulley assembly, the pulley block, the second guide pulley and the second movable pulley.

[0037] (4) The first oil cylinder retracts and pre-tightens the wire rope; when the wire rope is pre-tightened, proceed to step (5).

[0038] (5) The second cylinder retracts to perform a tension test on the pulley assembly.

[0039] In the above test method, the pulley device is first installed, and then the first cylinder and the second cylinder are extended; the distance between the first movable pulley and the second movable pulley and the rope winding pulley group is shortened to facilitate the winding of the wire rope; when the wire rope is wound, the first cylinder is retracted to pre-tighten the wire rope, so as to avoid the wire rope length shrinking beyond the stroke of the second cylinder, resulting in the inability to perform the tensile test; then the pulley device is subjected to a tensile test by retracting the second cylinder. At the same time, since the wire rope exerts a tensile force on the pulley device; the connecting device also exerts a tensile force on the pulley device; the wire rope and the connecting device exert a tensile force in opposite directions on the pulley device; when the two tensile forces interact with each other, they will be converted into a force to stabilize the bracket; thereby achieving stable support for the bracket; when using the tensile testing machine in this way, there is no need to fix the tensile testing machine to the ground, but only need to place the tensile testing machine on the ground to carry out the tensile test.

[0040] In the above method, step (3) specifically comprises: first connecting one end of the wire rope to the first fixed part; then winding the wire rope around the first movable pulley, the first guide pulley, a rope winding pulley, a pulley pulley, another rope winding pulley, another pulley pulley, another rope winding pulley, another pulley pulley, another rope winding pulley, another pulley pulley, the last rope winding pulley, the second guide pulley, and the second movable pulley in sequence, and then connecting the other end of the wire rope to the second fixed part.

[0041] Step (5) is specifically as follows: the second oil cylinder retracts; the steel wire rope generates a pulling force on the pulley device to drive the pulley device to move upward, and a force is generated between the connecting device and the pulley device to offset the upward movement of the pulley device; and then a tension test is performed on the pulley device.

[0042] Step (5) also includes: the steel wire rope and the connecting device generate tension in opposite directions on the object to be detected; when the two tensions interact with each other, they are converted into a force to stabilize the bracket, thereby achieving stable support for the bracket.

Claims

1. A test method for a tensile testing machine, characterized in that: The tensile testing machine includes a bracket and a test assembly; the bracket includes a base, a crossbeam and a column assembly; the crossbeam is located above the base, and the column assembly is arranged between the crossbeam and the base; the column assembly includes a first column and a second column; the first column and the second column are each provided with more than two; the first column is close to one end of the crossbeam and the base; the second column is close to the other end of the crossbeam and the base; the test assembly includes a pulley assembly, a first driving oil cylinder, a second driving oil cylinder and a connecting device; the pulley assembly is arranged on the crossbeam; the pulley assembly includes a first guide pulley, a second guide pulley and a rope pulley block; the rope pulley block includes five rope pulleys; The connecting device is arranged on the base and extends toward the crossbeam; the connecting device is used for installing the object to be detected; the first driving oil cylinder is arranged at one end of the base and is located between the two first columns; the second driving oil cylinder is arranged at the other end of the base and is located between the two second columns; a first fixing part is provided at one end of the crossbeam close to the first driving oil cylinder; a second fixing part is provided at one end of the crossbeam close to the second driving oil cylinder; the movable end of the first driving oil cylinder is connected to the first movable pulley; the movable end of the second driving oil cylinder is connected to the second movable pulley; the object to be detected is an object to be detected with four pulleys; a steel wire rope is wound around the first movable pulley, the rope winding pulley, the pulley of the object to be detected and the second movable pulley; one end of the steel wire rope is connected to the first fixing part; the other end of the steel wire rope is connected to the second fixing part; the steel wire rope and the connecting device generate pulling forces in opposite directions on the object to be detected; The base, the crossbeam, the first column and the second column all have one or more supporting parts extending toward the tensile test space. When the tensile test machine is placed horizontally for use, the supporting plate is placed on the supporting parts. Adjacent supporting parts are arranged around the tensile test space. The supporting parts are provided with one or more mounting holes. The test method of the tensile testing machine includes the following steps: (1). Install the object to be tested; (2) The first cylinder and the second cylinder extend; (3) The wire rope is wound around the first movable pulley, the first guide pulley, the rope winding pulley assembly, the pulley block, the second guide pulley and the second movable pulley, and one end of the wire rope is first connected to the first fixed part; then the wire rope is wound around the first movable pulley, the first guide pulley, a rope winding pulley, a pulley pulley, another rope winding pulley, another pulley pulley, another rope winding pulley, another pulley pulley, another rope winding pulley, another pulley pulley, the last rope winding pulley, the second guide pulley and the second movable pulley in sequence, and the other end of the wire rope is connected to the second fixed part; (4) The first oil cylinder retracts the pre-tightened wire rope; when the wire rope is pre-tightened, proceed to step (5); (5) The second oil cylinder is retracted to perform a tension test on the object to be detected. The second oil cylinder is retracted; the steel wire rope generates tension on the object to be detected to drive the object to be detected to move upward, and a force is generated between the connecting device and the object to be detected to offset the upward movement of the object to be detected; and then a tension test is performed on the object to be detected.

2. The testing method of a tensile testing machine according to claim 1, characterized in that: Step (5) also includes: the steel wire rope and the connecting device generate tension in opposite directions on the object to be detected; when the two tensions interact with each other, they are converted into a force to stabilize the bracket, thereby achieving stable support for the bracket.

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