CN110823680A - A tensile testing machine and its control method - Google Patents

Abstract

A tensile testing machine and its control method of the present invention are characterized by comprising a frame, a lifting table and a tensile device; both ends of the frame are provided with fixing frames for fixing the tensile device, and the frame includes The first sub-rack and the second sub-rack with the same structure, the first sub-rack and the second sub-rack are symmetrically arranged and can be detachably connected; the lifting table is arranged inside the rack, so The lifting table includes a controller, a table board and a lifting device, the lifting devices are installed at both ends of the lifting table, and the controller controls the lifting device to move the lifting table up and down; the pulling device includes a pulling machine and positioning columns, the tensile machine and the positioning columns are respectively installed on the fixing frames at both ends of the frame, and the positioning columns and the fixing frames are connected by a tensile component, which is structurally stable and safe. The test process is fast and efficient, and the workers are easy to operate.

Description

A tensile testing machine and its control method

technical field

The invention relates to the technical field of testing equipment, in particular to a tensile testing machine and a control method thereof.

Background technique

Tensile testing machine is also known as universal material testing machine. The testing machine is suitable for testing various physical and mechanical properties of plastic sheet, pipe, profile, plastic film, rubber, wire and cable, steel, glass fiber and other materials. The tension machine fixture is an important part of the instrument, and different materials require different fixtures, which is also an important factor for the smooth progress of the test and the accuracy of the test results.

Among them, the tensile testing machines that test the strength of the wire clamps are generally large-scale equipment. The existing tensile testing machines are either too small in size, and when the personnel conduct the test, the operating space is small and the work is difficult. The upper limit of the tensile force of the machine is also small, or the size of the equipment It is too large, takes up a lot of space, is too heavy, and is difficult to move. It cannot cope with the test requirements of different cable lengths, and the existing tensile testing machines are mostly fixed on the workbench for placing materials. It is slow, so the time for straightening the cable is prolonged, the work efficiency is low, and the cable may be pulled and broken during the test process, so corresponding protection measures are required.

Therefore, how to improve the existing tensile testing machine to overcome the above problems is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a tensile testing machine and its control method with high structural strength, convenient operation by workers, and accurate and safe testing process.

Another object of the present invention is to provide a lifting table of a tensile testing machine that can be raised and lowered quickly and stably.

Another object of the present invention is to provide a frame of a tensile testing machine that is stable in structure, can increase the length of the equipment through splicing to meet different test requirements, and is resistant to large tensile forces and is not easily deformed.

Another object of the present invention is to provide a tensile component of a tensile testing machine that can effectively fix the tensile device, prevent it from moving, and has high structural strength and is not easily deformed.

In order to achieve the above purpose, the technical scheme adopted in the present invention is: a tensile testing machine, including a frame, a lifting table and a tensile device;

The frame is a frame frame, the frame has an upper beam and a lower beam, the lower beam of the frame is in contact with the ground, and the two ends of the frame are provided with fixing frames for fixing the tension device, so The rack includes a first sub-rack and a second sub-rack with the same structure, and the first sub-rack and the second sub-rack are symmetrically arranged and can be detachably connected;

The lifting table is arranged inside the rack, and the lifting table includes a controller, a table board and a lifting device, the lifting devices are installed at both ends of the lifting table, and the controller controls the lifting device to make all the lifting devices The lifting table can move up and down, and the lifting device includes a first lifting rod and a second lifting rod. The first lifting rod and the second lifting rod are crossed and connected in rotation, and are installed on both sides of the table board. One end of the first lifting rod is slidably connected with the frame, the other end is rotatably connected with the table board, one end of the second lifting rod is slidably connected with the table board, and the other end is connected with the frame rotating connection;

The tensioning device includes a tensioning machine and a positioning column, the tensioning machine and the positioning column are respectively installed on the fixing frames at both ends of the frame, and a tensile component is passed between the positioning column and the fixing frame. connect.

Specifically, the fixing frame includes a transverse support, a first longitudinal support and a second longitudinal support, the two transverse supports are fixedly connected to the frame, and the first longitudinal support is fixedly connected to the transverse support and the In the frame, the two second longitudinal supports are fixedly connected to the two transverse supports, and a tension device passage opening is formed between the two second longitudinal supports and the two transverse supports.

Specifically, the tensile assembly includes a tensile plate and a tensile block, the tensile plate covers the outer side of the fixing frame, and the tensile plate is provided with a through hole for the positioning column to pass through, so The tensile block is fixedly arranged on the tensile plate, the tensile block includes a square tensile base and an arched fixed plate, and the two arched fixed plates are arranged in parallel on the square tensile base, so the The positioning column is rotatably arranged between the two arched fixing plates, and two sets of mutually symmetrical triangular reinforcing ribs are also arranged on the outside of the arched fixing plates.

Specifically, a long connecting plate is longitudinally installed on the connecting ends of the first sub-rack and the second sub-rack, the two long connecting plates are fixedly connected, and the first sub-rack and the second sub-rack are Short connecting plates are laterally installed on both sides of the connecting end of the two-part rack, and the rack further includes a fixing plate, which is fixedly connected to two adjacent short connecting plates.

As an improvement, a triangular support block and a support rod are arranged on both sides of the frame, the triangular support block is arranged at the structural connection of the frame, and the support rod is fixedly connected to the upper beam of the frame and the frame. Lower the beam.

As an improvement, a U-shaped sliding rail is arranged between the upper beam of the frame and the lower beam of the frame, and a partition plate is slidably arranged on both sides of the U-shaped sliding rail.

As an improvement, connecting rods are provided between the first lifting rods on both sides of the same end, the connecting rods are connected by a transmission rod, and the controller is rotatably connected to the connecting rod at one end.

As an improvement, the length of the tensile board is the same as the width of the frame, and the width of the tensile board is greater than the length of the square tensile base.

As an improvement, multiple rows of observation holes arranged at equal intervals are provided on the partition.

The invention also relates to a control method of a tensile testing machine, which is characterized in that it comprises a tensile digital display device, an oil cylinder, a low-pressure pump and a high-pressure pump, and the fixed value a of the tensile digital display device is set as the test rated load, and the The fixed value b of the tensile force digital display instrument is set to be half of the rated load of the test. When the oil cylinder starts to work, the low-pressure pump and the high-pressure pump simultaneously supply oil and quickly tighten. When the load reaches the When the fixed value b, the oil supply of the low-pressure pump is cut off, the high-pressure pump is slowly supplied with oil to the fixed value a, and when the load reaches the set value of the fixed value a, the oil supply of the high-pressure pump is cut off, The oil cylinder is kept in a locked state. When the workpiece is deformed or the oil leakage of the oil cylinder causes the pulling force to decrease, the high-pressure pump starts to supply oil to maintain the rated test pulling force. The pulling force value error is 0~1Kn. When the pulling force time reaches the set time, Automatic activation of the low pressure pump and rapid relaxation of the high pressure pump.

Compared with the prior art, the advantages of the present invention are: the tensile testing machine improves the traditional frame structure, changes the frame into a floor-standing type, and the distance between the frame bodies can facilitate the operation of the staff and reduce the compression. The rack is divided into two symmetrical parts, left and right. Through the detachable connection structure, the main body of the rack can be split and combined, and the length of the rack can be extended according to the test requirements. When testing, the lifting table can be raised to reduce the working stroke of the tensile testing machine and speed up the testing speed. The two ends of the frame are provided with reinforced fixed frames, which are connected with the tensile components to realize the tension testing machine. And the stable fixation of the positioning column, the sliding partitions are added on both sides of the frame to reduce the dangerous accident that may be caused when the cable breaks.

Description of drawings

FIG. 1 is an overall structural view according to a preferred embodiment of the present invention;

Figure 2 is a front view according to a preferred embodiment of the present invention;

Figure 3 is a left side view according to a preferred embodiment of the present invention;

FIG. 4 is a structural diagram of the fixing frame after the tensile assembly is removed according to a preferred embodiment of the present invention;

5 is a cross-sectional view along the direction A-A in FIG. 3 according to a preferred embodiment of the present invention;

FIG. 6 is an enlarged view at a in FIG. 1 according to a preferred embodiment of the present invention.

Detailed ways

The following description serves to disclose the invention to enable those skilled in the art to practice the invention. The preferred embodiments described below are given by way of example only, and other obvious modifications will occur to those skilled in the art.

In the description of the present invention, it should be noted that, for orientation words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower" , "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise" ” etc. indicating the orientation and positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or a specific orientation. The structure and operation should not be construed as limiting the specific protection scope of the present invention.

The present invention will be further described below in conjunction with the accompanying drawings:

As shown in Figures 1 to 6, a preferred embodiment of the present invention includes a frame 1, a lifting table 2 and a tension device 3;

Rack 1 is a frame type rack. Rack 1 has an upper beam 11 and a lower beam 12. The lower beam 12 is in contact with the ground to form a floor-standing rack. The height of rack 1 is about 1.8 meters to ensure the working space of the staff. , to reduce the sense of oppression, the two ends of the frame 1 are provided with fixing frames 13 for fixing the tension device 3, and the frame 1 includes a first sub-rack 14 and a second sub-rack 15 with the same structure. The first sub-rack 14 and The second sub-rack 15 is symmetrically arranged and can be detachably connected, and additional racks 1 can be spliced together according to the test requirements to increase the length of the rack 1 and facilitate the disassembly and handling of the rack 1;

The lift table 2 is arranged inside the rack 1. The lift table 2 includes a controller 21, a table board 22 and a lift device 23. The lift devices 23 are installed at both ends of the lift table 2. The controller 21 controls the lift device 23 to make the lift table 2 go up and down. Moving, the lifting device 23 includes a first lifting rod 231 and a second lifting rod 232. The first lifting rod 231 and the second lifting rod 232 are arranged crosswise and rotatably connected, and are installed on both sides of the table board 22. The first lifting rod 231 One end is slidably connected with the frame 1, the other end is rotatably connected with the table board 22, one end of the second lifting rod 232 is slidably connected with the table board 22, and the other end is rotatably connected with the frame 1, the lifting table 2 is hydraulically raised and lowered, which is convenient for control , The height can be adjusted according to the installation requirements of the product. Since the tensile testing machine pursues the safety, stability and accuracy of the test, the process of pulling up the product is relatively slow. If there is no lift table 2, the cable is bent too much. , the straightening process will be prolonged, which will seriously affect the test efficiency;

The tension device 3 includes a tension machine 31 and a positioning column 32. The tension machine 31 and the positioning column 32 are respectively installed on the fixed frames 13 at both ends of the frame 1, and the positioning column 32 and the fixed frame 13 are connected by a tensile component 33 to enhance the tensile force. The strength of the connection between the machine 31 and the positioning column 32 and the frame 1 reduces the possibility of deformation and damage.

The fixing frame 13 includes a transverse support 131, a first longitudinal support 132 and a second longitudinal support 133. The two transverse supports 131 are fixedly connected to the frame 1, and the first longitudinal support 132 is fixedly connected to the transverse support 131 and the frame 1. The two longitudinal brackets 133 are fixedly connected to the two transverse brackets 131 , and a tension device passage port 134 is formed between the two second longitudinal brackets 133 and the two transverse brackets 131 , which is suitable for the connection with the tension device 3 and enhances the structural firmness. , to ensure that the tension device 3 will not be separated from the frame 1 or deform the frame 1 .

The tensile assembly 33 includes a tensile plate 331 and a tensile block 332. The tensile plate 331 covers the outer side of the fixing frame 13. The tensile plate 331 is provided with a through hole 333 for the positioning post 32 to pass through. The tensile block 332 is fixedly arranged On the tensile plate 331, the tensile plate 331 is used for dispersing the pressure and evenly distributing the force to the fixing frame 13, the tensile block 332 includes a square tensile base 334 and an arched fixing plate 335, and two arched fixing plates 335 It is arranged in parallel on the square tensile base 334, the positioning column 32 is rotatably arranged between the two arched fixing plates 335, and two sets of mutually symmetrical triangular reinforcing ribs 336 are arranged on the outside of the arched fixing plate 335. The positioning column 32 is completely fixed, so that the positioning column 32 does not rotate offset.

A long connecting plate 16 is installed longitudinally at the connecting ends of the first sub-rack 14 and the second sub-rack 15, and the two long connecting plates 16 are fixedly connected. The connecting ends of the first sub-rack 14 and the second sub-rack 15 Short connecting plates 17 are installed laterally on both sides, and the rack 1 also includes a fixing plate 18. The fixing plate 18 is fixedly connected to two adjacent short connecting plates 17, and the first sub-rack 14 and the first sub-rack 14 and the second sub-rack 17 are fixed by double fixing horizontally and vertically. The two sub-racks 15 are firmly connected, and the structure can be opened for easy disassembly when transporting, and can also be used for splicing when the length needs to be increased.

A triangular support block 191 and a support rod 192 are arranged on both sides of the frame 1. The triangular support block 191 is arranged at the structural connection of the frame 1 to prevent the frame 1 from falling apart. The support rod 192 is fixedly connected to the upper beam 11 of the frame and the lower frame of the frame. The beam 12 and the support rod 192 are used to support the upper beam 11 of the frame.

A U-shaped sliding rail 193 is arranged between the upper frame beam 11 and the lower frame beam 12, and a partition plate 194 is slidably provided on both sides of the U-shaped sliding rail 193. When the machine is running, the two partitions 194 can be unfolded to realize the protection function.

A connecting rod 233 is provided between the first lifting rods 231 on both sides of the same end. The connecting rods 233 are connected by a transmission rod 234. The controller 21 is rotatably connected with the connecting rod 233 at one end, so that the two ends of the lifting table 2 can be synchronized. Lift up and down to increase the stability of the lift table 2 .

The length of the tensile plate 331 is the same as the width of the frame 1, and the width of the tensile plate 331 is greater than the length of the square tensile base 334, which can not only ensure the appearance, but also ensure the strength of the tensile plate 331 and the effect of dispersing force.

The partition plate 194 is provided with multiple rows of observation holes 195 arranged at equal intervals, which is convenient for personnel to view from the outside when the machine is running, so as to prevent accidents caused by ignorance of the internal conditions of the machine.

The invention also relates to a control method of a tensile testing machine, which includes a tensile digital display instrument, an oil cylinder, a low-pressure pump and a high-pressure pump. The value b is set as half of the rated load of the test. When the cylinder starts to work, the low-pressure pump and the high-pressure pump supply oil at the same time and quickly tighten. When the load reaches the fixed value b, the low-pressure pump is cut off and the high-pressure pump is slowly supplied The oil is pulled to the fixed value a. When the load reaches the set value of the fixed value a, the oil supply of the high-pressure pump is cut off, and the oil cylinder is kept in a locked state. When the workpiece is deformed or the oil leakage of the oil cylinder causes the tension to decrease, the high-pressure pump starts to supply oil to maintain the rated test tension. , the tension value error is 0 ~ 1Kn, when the tension time reaches the set time, the rapid relaxation of the low-pressure pump and the high-pressure pump is automatically started. This control method can achieve relatively precise control of the tension and ensure the accuracy of the test.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions describe only the principles of the present invention. Without departing from the spirit and scope of the present invention, there are various Variations and improvements are intended to fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. A tensile testing machine is characterized in that: comprises a frame, a lifting table and a tension device;

the frame is a frame type frame, the frame is provided with an upper beam and a lower beam, the lower beam of the frame is contacted with the ground, fixing frames for fixing the tension device are arranged at two ends of the frame, the frame comprises a first sub frame and a second sub frame which have the same structure, and the first sub frame and the second sub frame are symmetrically arranged and detachably connected;

the lifting table is arranged in the rack and comprises a controller, a table plate and a lifting device, the lifting device is installed at two ends of the lifting table, the controller controls the lifting device to enable the lifting table to move up and down, the lifting device comprises a first lifting rod and a second lifting rod, the first lifting rod and the second lifting rod are arranged in a crossed mode, are rotatably connected and are installed on two sides of the table plate, one end of the first lifting rod is connected with the rack in a sliding mode, the other end of the first lifting rod is connected with the table plate in a rotating mode, one end of the second lifting rod is connected with the table plate in a sliding mode, and the other end of the second lifting rod is connected with the rack in a rotating mode;

the tension device comprises a tension machine and a positioning column, the tension machine and the positioning column are respectively installed on the fixing frames at the two ends of the rack, and the positioning column is connected with the fixing frames through a tension assembly.

2. The tensile testing machine of claim 1, wherein: the fixing frame comprises a transverse support, a first longitudinal support and a second longitudinal support, the transverse support is fixedly connected with the rack, the first longitudinal support is fixedly connected with the transverse support and the rack, the second longitudinal support is fixedly connected with the transverse support, and a tension device passing opening is formed between the second longitudinal support and the transverse support.

3. The tensile testing machine of claim 1, wherein: tensile subassembly includes tensile board and tensile piece, tensile board cover in the mount outside, be provided with the confession on the tensile board the clearing hole that the reference column passed, tensile piece fixed set up in on the tensile board, tensile piece includes square tensile base and arch fixed plate, two arch fixed plate parallel arrangement in on the square tensile base, the reference column rotates set up in two between the arch fixed plate, the arch fixed plate outside still is provided with the triangle-shaped strengthening rib of two sets of symmetries of each other.

4. The tensile testing machine of claim 1, wherein: the rack comprises a first sub rack, a second sub rack and a fixing plate, wherein the first sub rack and the second sub rack are connected through the connecting end, the tail end of the connecting end of the first sub rack and the tail end of the connecting end of the second sub rack are longitudinally provided with long connecting plates, the two long connecting plates are fixedly connected, short connecting plates are transversely arranged on two sides of the connecting end of the first sub rack and the two sides of the connecting end of the second sub rack, the.

5. The tensile testing machine of claim 1, wherein: the supporting device comprises a rack, and is characterized in that triangular supporting blocks and supporting rods are arranged on two sides of the rack, the triangular supporting blocks are arranged at structural joints of the rack, and the supporting rods are fixedly connected with an upper beam of the rack and a lower beam of the rack.

6. The tensile testing machine of claim 1, wherein: a U-shaped sliding rail is arranged between the upper frame beam and the lower frame beam, and two sides of the U-shaped sliding rail are respectively provided with a partition plate in a sliding mode.

7. The tensile testing machine of claim 1, wherein: the two sides of the same end are provided with connecting rods between the first lifting rods, the connecting rods are connected through transmission rods, and the controller is connected with the connecting rods at one end in a rotating mode.

8. A tensile testing machine according to claim 3, wherein: the length of the tensile plate is the same as the width of the rack, and the width of the tensile plate is larger than the length of the square tensile base.

9. The tensile testing machine of claim 6, wherein: and a plurality of rows of observation holes are arranged on the partition plate at equal intervals.

10. A control method of a tensile testing machine is characterized in that: the device comprises a tension digital display instrument, an oil cylinder, a low-pressure pump and a high-pressure pump, wherein a fixed value a of the tension digital display instrument is set as a test rated load, a fixed value b of the tension digital display instrument is set as one half of the test rated load, when the oil cylinder starts to work, the low-pressure pump and the high-pressure pump simultaneously supply oil and are quickly tensioned, when the load reaches the fixed value b, the low-pressure pump is cut off to supply oil, the high-pressure pump slowly supplies oil to the fixed value a, when the load reaches the set value of the fixed value a, the high-pressure pump is cut off to supply oil, the oil cylinder keeps a locked state, when a workpiece deforms or the oil leakage of the oil cylinder causes the reduction of tension, the high-pressure pump starts to supply oil and keeps the rated test tension, the error of the tension value is 0-1 KN, and when the tension time reaches the set.

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