A tensile testing machine

Abstract

The present invention provides a tension testing machine, comprising a bracket and a test assembly; the test assembly comprises a wheel assembly, a first driving oil cylinder, a second driving oil cylinder and a connecting device; the test assembly is connected to a pulley device through the connecting device; a steel wire rope is wound around a first movable pulley, a pulley assembly, a pulley device 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 through the first oil cylinder; a tension test is performed by driving the second movable pulley through 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 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 testing devices, and in particular to 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 tension testing machine capable of pre-tightening a steel wire rope.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a tensile testing machine, including a bracket and a test 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 cylinder, a second driving cylinder and a connecting device; the pulley assembly is arranged on the crossbeam; the connecting device is arranged on the base and extends toward the crossbeam; the connecting device is used to install the object to be detected; the first driving cylinder is arranged at one end of the base and is located between the two first columns; the second driving cylinder is arranged at the other end of the base and is located between the two second columns; a first fixing portion is provided at one end of the crossbeam close to the first driving cylinder; a second fixing portion is provided at one end of the crossbeam close to the second driving cylinder; the movable end of the first driving cylinder is connected to the first movable pulley; the movable end of the second driving cylinder is connected to the second movable pulley; the object to be detected is an object to be detected having a pulley; a steel wire rope is provided around the first movable pulley, the pulley assembly, 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 portion; the other end of the steel wire rope is connected to the second fixing portion; the steel wire rope and the connecting device produce a pulling force in the opposite direction to the object to be detected.

[0007] A tensile test space is formed between the crossbeam, the base, the first column and the second column; the base, the crossbeam, the first column and the second column all have more than one supporting portion extending toward the tensile test space; and adjacent supporting portions are arranged around the tensile test space.

[0008] The above arrangement is connected to the object to be detected through a connecting device; when in use, the wire rope is wound around the first movable pulley, the pulley assembly, the pulley device and the second movable pulley, and one end of the wire rope is connected to the first fixed part; the other end of the wire rope is connected to the second fixed part; the first movable pulley is driven by the first oil cylinder to pre-tighten the wire rope; the second movable pulley is driven by the second oil cylinder to perform a tensile test; before performing the tensile test, the wire rope is pre-tightened first to avoid the wire rope length from exceeding the stroke of the second oil cylinder when contracted, resulting in the inability to perform the tensile test.

[0009] The supporting part is provided to support the supporting plate; when the tensile testing machine is used horizontally, the supporting plate is placed on the supporting part, so that walking on the tensile testing machine can be realized. At the same time, the supporting part arranged around the tensile testing space supports the supporting plate more stably.

[0010] Through the steel wire rope and the connecting device, opposite tensile forces are generated on the object to be tested; when the two tensile forces interact with each other, they are 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.

[0011] Further; the pulley assembly includes a first guide pulley, a second guide pulley and a rope winding pulley group; the rope winding pulley group includes more than two rope winding pulleys; the wire rope is arranged on the first movable pulley, the first guide pulley, the rope winding pulley group, the second guide pulley and the second movable pulley.

[0012] Furthermore, the supporting portion is provided with more than one mounting hole. By providing the mounting holes, the supporting plate can be stably mounted on the supporting portion.

[0013] Furthermore, a first supporting portion is protruded from the bottom of the base in a direction away from the cross beam.

[0014] With the above arrangement, by providing the first supporting portion, when the tensile testing machine is used vertically, the first supporting portion is used to contact the ground, thereby reducing the wear on the tensile testing machine.

[0015] Furthermore, a second supporting portion is protruding outwardly from one side of the base and the crossbeam.

[0016] With the above arrangement, by providing the second supporting portion, when the tensile testing machine is placed horizontally for use, the second supporting portion is used to contact the ground, thereby reducing the wear on the tensile testing machine.

[0017] Furthermore, an equal number of supporting parts are respectively provided on the base, the crossbeam, the first column and the second column. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the present invention connected with the pulley device.

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

[0020] Figure 3 It is a left side view of the present invention connected with the pulley device.

[0021] Figure 4 It is a right side view of the present invention connected with the pulley device.

[0022] Figure 5 This is a schematic diagram of the pulley device being subjected to a tensile test according to the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-5 As shown; a tensile testing machine, including a bracket and a test assembly; the bracket includes a base 11, a crossbeam 12 and a column assembly; the crossbeam 12 is located above the base 11, and the column assembly is arranged between the crossbeam 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 crossbeam 12 and the base 11; the second column 14 is close to the other end of the crossbeam 12 and the base 11.

[0025] 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 .

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The test method of the tensile testing machine includes the following steps:

[0033] (1) Install the pulley device.

[0034] (2) The first cylinder and the second cylinder extend.

[0035] (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.

[0036] (4) The first oil cylinder retracts and pre-tightens the wire rope; when the wire rope is pre-tightened, proceed to step (5).

[0037] (5) The second cylinder retracts to perform a tension test on the pulley assembly.

[0038] 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, 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 situation where the length of the wire rope exceeds the stroke of the second cylinder when it shrinks, resulting in the inability to perform the tensile test; then the pulley device is subjected to a tensile test by retracting the second cylinder.

[0039] 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.

[0040] 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.

Claims

1. A tensile testing machine, characterized in that: The invention comprises a bracket and a test assembly; the bracket comprises 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 comprises 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 cross beam; the connecting device is arranged on the base and extends toward the cross beam; the connecting device is used to install 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 portion is provided at one end of the cross beam close to the first driving oil cylinder; a second fixing portion is provided at one end of the cross beam 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 having a pulley; a steel wire rope is wound around the first movable pulley, the pulley assembly, 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 portion; the other end of the steel wire rope is connected to the second fixing portion; the steel wire rope and the connecting device generate pulling forces in opposite directions on the object to be detected; A tensile test space is formed between the crossbeam, the base, the first column and the second column; the base, the crossbeam, the first column and the second column all have one or more supporting parts extending toward the tensile test space; adjacent supporting parts are arranged around the tensile test space; 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 testing 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, and one or more mounting holes are provided on the supporting parts.

2. A tensile testing machine according to claim 1, characterized in that: The pulley assembly comprises a first guide pulley, a second guide pulley and a rope winding pulley group; the rope winding pulley group comprises more than two rope winding pulleys; the steel wire rope is wound around the first movable pulley, the first guide pulley, the rope winding pulley group, the second guide pulley and the second movable pulley.

3. A tensile testing machine according to claim 1, characterized in that: A first supporting portion is protruded from the bottom of the base in a direction away from the cross beam.

4. A tensile testing machine according to claim 1, characterized in that: A second supporting portion is protruded outwardly from one side of the base and the cross beam.

5. A tensile testing machine according to claim 1, characterized in that: An equal number of supporting parts are respectively arranged on the base, the cross beam, the first column and the second column.

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