CN118706626A - A tensile testing machine with protection function - Google Patents

Abstract

The invention discloses a tensile testing machine with a protection function, and belongs to the technical field of tensile testing; the automatic clamping device comprises a workbench and two mechanical clamping jaws used for clamping an object to be tested, wherein the upper side of the workbench is fixedly connected with a support, the upper side of the workbench is fixedly connected with a first hydraulic rod, the output end of the first hydraulic rod is fixedly connected with a moving plate, the moving plate is connected with the support in a sliding manner up and down, four groups of protection plates are symmetrically and fixedly connected in the support in pairs, multiple groups of strain gauges are arranged on the upper side of the workbench, and multiple groups of patch components which automatically install the strain gauges on the object to be tested are arranged in the support. When the tension test is carried out, the invention not only can automatically complete the mounting and dismounting operations of the strain gauge, but also can uniformly distribute the strain gauge, can better complete the protection effect of the tested object during the tension test, is integrally and automatically carried out, does not need to be adjusted by using a manual mode, and has good practical effect.

Description

A tensile testing machine with protection function

Technical Field

The invention relates to the technical field of tensile testing, and in particular to a tensile testing machine with a protective function.

Background Art

Tensile testing machine, also known as universal material testing machine, is a mechanical force testing machine used to perform mechanical property tests such as static load, stretching, compression, bending, shearing, tearing, peeling, etc. on various materials. It is suitable for various physical and mechanical property tests of plastic plates, pipes, special-shaped materials, plastic films, rubber, wires and cables, steel, glass fiber and other materials for material development, physical property testing, teaching research, quality control and other indispensable testing equipment;

When conducting a tensile test on an object, in order to protect the object being tested, a strain gauge is often glued to the outside of the object being tested. During the tensile test, the value generated by the strain gauge changes linearly as the tensile test progresses. When the value of the strain gauge suddenly changes dramatically, it means that the object being tested has reached its tensile limit. At this time, the tensile test is stopped immediately and a protective operation can be performed on the object being tested.

In the above operation process, the strain gauge needs to be manually adhered to the object to be tested, which is time-consuming and laborious. The position of the strain gauge is relatively loose. At the same time, when the object reaches the tensile limit, the object may break and produce fragments. Since the tensile testing machine does not have corresponding protective devices, it is very likely to cause harm to nearby workers. When the object reaches the tensile limit, the surface of the object is likely to be damaged at the same time. The staff needs to compare the size of the damage and analyze the cause of the damage. The comparison is time-consuming and laborious by manual means, and the work efficiency is low.

Summary of the invention

The purpose of the present invention is to solve the shortcomings of the prior art and to propose a tensile testing machine with a protective function.

The present invention adopts the following technical solutions:

A tensile testing machine with a protection function comprises a workbench and two mechanical clamps for clamping a measured object, the upper side of the workbench is fixedly connected to a bracket, the upper side of the bracket is fixedly connected to a first hydraulic rod, the output end of the first hydraulic rod is fixedly connected to a movable plate, the movable plate and the bracket are slidably connected up and down, four groups of protection plates are symmetrically fixedly connected in pairs in the bracket, a plurality of groups of strain gauges are provided on the upper side of the workbench, a plurality of groups of patch components for automatically mounting the strain gauges on the measured object are installed in the bracket, the patch component comprises a mounting cylinder, the strain gauge is fixedly mounted on the side wall of the mounting cylinder, a square cylinder is fixedly connected on a side of the mounting cylinder away from the strain gauge, a square rod is slidably sleeved in the square cylinder, a second spring is fixedly connected between the square rod and the bottom of the square cylinder, the square rod passes through the bracket and is slidably connected to the bracket, the square rod is fixedly connected to a limiting plate, and a first spring is fixedly connected between the limiting plate and the bracket.

Preferably, a second rack is fixedly connected to the upper side of the square rod, the upper side of the second rack is meshedly connected to the first gear, a rotating rod is fixedly sleeved inside the first gear, the rotating rod and the protective plate are rotatably connected, a half gear is also fixedly sleeved on the outer side of the rotating rod, two telescopic plates are symmetrically fixedly connected to the lower side of the movable plate, and the side walls of the telescopic plates are fixedly connected to the first rack.

Preferably, a protective component for reducing injuries to workers is installed in the bracket, and the protective component includes deep grooves, and the deep grooves are divided into four groups, two of which are opened on the workbench, and the two outer groups of deep grooves are opened on the upper inner wall of the bracket. Multiple groups of protective rods are installed in the bracket, and the multiple groups of protective rods pass through the deep grooves and abut against the bottom of the deep grooves. Protective plates are fixedly sleeved on the outer sides of the multiple groups of protective rods, and two groups of positioning plates are slidably connected in each group of the deep grooves. A third spring is fixedly connected between the two groups of positioning plates, and the two groups of positioning plates and protective rods abut against each other. Two groups of second hydraulic rods are fixedly connected to the outside of the workbench and the bracket, and push plates are fixedly connected to the output ends of the four groups of second hydraulic rods.

Preferably, a detection rod is slidably sleeved in the installation tube, and clamps are fixedly connected to the upper and lower ends of the detection rod. The detection rod is located in the installation tube and is fixedly connected to two groups of first triangular plates. Two groups of second triangular plates are slidably sleeved in the installation tube, and the two groups of second triangular plates are located on the upper side of the first triangular plate and are arranged opposite to the first triangular plate. Sensors are fixedly connected to the side of the two groups of second triangular plates away from the installation tube.

Preferably, the lower side of the lowermost clamping plate is fixedly connected with a connecting rod, the lower side of the connecting rod is fixedly connected with a second trapezoidal plate, the side wall of the push plate is fixedly connected with the first trapezoidal plate through the connecting plate, and the second trapezoidal plate is located on the upper side of the first trapezoidal plate and abuts against the first trapezoidal plate.

Preferably, outer sides of the first triangular plate and the second triangular plate are both smooth.

Preferably, outer sides of the first trapezoidal plate and the second trapezoidal plate are both smooth.

The beneficial effects of the present invention are:

1. First of all, when conducting a tensile test, not only can the installation and disassembly of the strain gauge be completed automatically, but the strain gauge is evenly distributed, which can better protect the tensile test of the object being tested. The whole process is automated and does not require manual adjustment, which has a good practical effect.

2. When the measured object reaches the measured limit, the first hydraulic rod is quickly closed and the second hydraulic rod is quickly started. Under the action of the second hydraulic rod, the protective rod and the protective plate can be driven to move, and the empty positions on the front and rear sides of the bracket are sealed to reduce the possibility of the object being broken and the fragments splashing to cause harm to nearby workers. The device as a whole can not only complete the protection operation of the measured object, but also form a protection operation for the surrounding workers;

3. After the object under test reaches the test limit, while forming a protective operation, it can also perform certain detection operations on the object under test to detect whether there is significant damage to the side wall of the object. If there is significant damage, the staff can quickly lock the damaged position, which provides convenience for subsequent analysis and processing operations.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a tensile testing machine with a protective function proposed by the present invention;

FIG2 is a schematic diagram of the connection between a workbench and a mechanical clamp in a tensile testing machine with a protective function proposed by the present invention;

FIG3 is a schematic diagram of the connection of a patch assembly in a tensile testing machine with a protective function proposed by the present invention;

FIG4 is a schematic diagram of connection of a patch assembly in a tensile testing machine with a protective function proposed by the present invention from another angle;

FIG5 is a cross-sectional connection diagram of a square tube in a tensile testing machine with a protective function proposed by the present invention;

FIG6 is a top view of the connection diagram of a protection rod and a protection plate in a tensile testing machine with a protection function proposed by the present invention;

FIG7 is a schematic diagram of the connection of a protection rod and a protection plate at another angle in a tensile testing machine with a protection function provided by the present invention;

FIG8 is a schematic diagram of the connection of a protection rod and a protection plate in two different states in a tensile testing machine with a protection function proposed by the present invention;

FIG9 is an enlarged view of the structure at A in FIG7;

FIG. 10 is a schematic diagram of the connection between the detection rod and the clamping plate in a tensile testing machine with a protective function proposed by the present invention.

In the figure: 1 workbench, 2 mechanical gripper, 3 protection plate, 4 bracket, 5 patch assembly, 501 rotating rod, 502 first gear, 503 half gear, 504 square rod, 505 limit plate, 506 first spring, 507 first rack, 508 telescopic plate, 509 square tube, 510 installation tube, 511 strain gauge, 512 second rack, 513 second spring, 61 second hydraulic rod, 62 push plate, 63 protection rod, 64 protection plate, 65 third spring, 66 positioning plate, 67 deep groove, 71 first trapezoidal plate, 72 second trapezoidal plate, 73 connecting rod, 74 connecting plate, 75 detection rod, 76 first triangular plate, 77 clamping plate, 78 second triangular plate, 79 sensor, 8 first hydraulic rod, 9 moving plate.

DETAILED DESCRIPTION

Referring to FIGS. 1 to 10 , a tensile testing machine with a protective function comprises a workbench 1 and two mechanical clamps 2 for clamping a measured object, a bracket 4 is fixedly connected to the upper side of the workbench 1, a first hydraulic rod 8 is fixedly connected to the upper side of the bracket 4, a movable plate 9 is fixedly connected to the output end of the first hydraulic rod 8, the movable plate 9 and the bracket 4 are slidably connected up and down, one of the mechanical clamps 2 is fixedly connected to the workbench 1, and the other mechanical clamp 2 is fixedly connected to the movable plate 9, four sets of protective plates 3 are symmetrically fixedly connected in pairs in the bracket 4, and a plurality of strain gauges 511 are arranged on the upper side of the workbench 1;

First, a display screen and a start button for controlling the start of the first hydraulic rod 8 are installed on the outside of the workbench 1, and a plurality of work display lights are installed on the upper side of the workbench 1. After the first hydraulic rod 8 is started, the work display lights are on. When it is necessary to perform a tensile test on the object to be tested, the two ends of the object to be tested are fixed in the mechanical clamp 2, the first hydraulic rod 8 is started, the object to be tested is straightened first, and then the strain gauge 511 is attached to the outside of the object to be tested, and the first hydraulic rod 8 is started again to start the tensile test operation. Secondly, the strain gauge 511 is an element composed of a sensitive grid and the like for measuring strain. The working principle of the resistance strain gauge 511 is based on the strain effect, that is, the conductor or semiconductor material produces mechanical deformation under the action of external force. When the resistance value changes accordingly, this phenomenon is called "strain effect". One side of the strain gauge 511 is coated with glue, and the strain gauge 511 is connected to the display screen through a wire. When the tensile test is performed, the strain gauge 511 is attached to the outside of the object to be measured. When the object to be measured is stretched, the strain gauge 511 is stretched along with the object to be measured, and the value of the strain gauge 511 changes linearly with the stretching. When the value of the strain gauge 511 changes dramatically, it means that the stretched object has reached the limit of stretching. At this time, the display screen will immediately close the first hydraulic rod 8 to prevent the severe stretching from causing damage to the object to be measured, thereby forming a protective operation for the object to be measured. The above are all prior arts and no redundant elaboration is made.

As shown in Figures 3, 4 and 5, a plurality of patch components 5 are installed in the bracket 4 to automatically install the strain gauge 511 on the object to be measured. The patch component 5 includes a mounting tube 510. The number of mounting tubes 510 is multiple groups. The multiple groups of strain gauges 511 are matched and arranged one by one. The strain gauge 511 is fixedly installed on the side wall of the mounting tube 510. A square tube 509 is fixedly connected to the side of the mounting tube 510 away from the strain gauge 511. A square rod 504 is slidably sleeved in the square tube 509. A second spring 513 is fixedly connected between the square rod 504 and the bottom of the square tube 509. The square rod 504 runs through the bracket 4 and slides left and right on the bracket 4. Dynamic connection, the side of the square rod 504 away from the square tube 509 is fixedly connected to the limit plate 505, and the first spring 506 is fixedly connected between the limit plate 505 and the bracket 4. The upper side of the square rod 504 is fixedly connected to the second rack 512, and the upper side of the second rack 512 is meshed with the first gear 502. The rotating rod 501 is fixedly sleeved in the first gear 502, and the rotating rod 501 is rotatably connected to the protective plate 3. The outer side of the rotating rod 501 is also fixedly sleeved with a half gear 503. Two telescopic plates 508 are symmetrically fixedly connected to the lower side of the movable plate 9, and the side wall of the telescopic plate 508 is fixedly connected to the first rack 507;

First, when the first hydraulic rod 8 straightens the object to be measured, the first hydraulic rod 8 drives the movable plate 9 to move upward, and the movable plate 9 drives the telescopic plate 508 and the first rack 507 to move upward. When the first rack 507 and the half gear 503 are against each other, the half gear 503 is driven to rotate, and the half gear 503 drives the rotating rod 501 to rotate, and the rotating rod 501 drives the first gear 502 to rotate, and the first gear 502 drives the second rack 512 to move, and the second rack 512 drives the square rod 504 and the limit plate 505 to move, and the limit plate 505 compresses the first spring 506, and the square rod 504 also drives the square tube 509 to move through the second spring 513, and the square tube 509 drives the installation tube 510 and the strain gauge 511 to move. When the strain gauge 511 and the object to be measured are against each other, The second spring 513 will also be compressed until the connection between the half gear 503 and the first rack 507 is disconnected. When the half gear 503 and the first rack 507 are at the critical point of disconnection, the first spring 506 and the second spring 513 are both in a compressed state, and the strain gauge 511 and the object to be measured are stuck together, thereby completing the patch operation of the strain gauge 511. After the tensile test of the object to be measured is completed, the first hydraulic rod 8 is started again, so that the first hydraulic rod 8 drives the moving plate 9 to move downward, and the moving plate 9 drives the telescopic plate 508 and the first rack 507 to move downward, and finally drives the installation tube 510 and the strain gauge 511 to move away from the object to be measured, so that the strain gauge 511 and the object to be measured are disconnected, and the installation and disassembly operations of the strain gauge 511 can be automatically completed.

As shown in Figures 6 and 7, a protective component for reducing injuries to workers is installed in the bracket 4. The protective component includes deep grooves 67. There are four groups of deep grooves 67, two of which are opened on the workbench 1, and the two outer groups of deep grooves 67 are opened on the upper inner wall of the bracket 4. Multiple groups of protective rods 63 are installed in the bracket 4. The multiple groups of protective rods 63 penetrate the deep grooves 67 and abut against the bottom of the deep grooves 67. The outer sides of the multiple groups of protective rods 63 are fixedly sleeved with protective plates 64. Two groups of positioning plates 66 are slidably connected in each group of deep grooves 67. A third spring 65 is fixedly connected between the two groups of positioning plates 66. The two groups of positioning plates 66 and the protective rods 63 abut against each other. Two groups of second hydraulic rods are fixedly connected to the outer sides of the workbench 1 and the bracket 4. The output ends of the four groups of second hydraulic rods are fixedly connected with push plates 62. The push plates 62 are located on the outer sides of the protective plates 64 and abut against the protective plates 64.

In the absence of external force, the third spring 65 is in a compressed state, and the positions of the protective plate 64 and the protective rod 63 are shown in Figures 6 and 7. After the first hydraulic rod 8 is activated, the second hydraulic rod 61 is activated at the same time, and the second hydraulic rod 61 drives the push plate 62 to move in the direction close to the protective rod 63. After the push plate 62 and the protective plate 64 are abutted, the protective plate 64 and the protective rod 63 will be driven to move, as shown in Figure 8, so that the protective rod 63 and the protective plate 64 are changed from the upper connection state to the lower connection state, and the deployment range of the protective rod 63 and the protective plate 64 becomes wider, gradually filling the space on the front and rear sides of the bracket 4, so that the space between the bracket 4 and the protective plate 64 gradually becomes a closed space, reducing the possibility that the measured object is stretched to the limit and suddenly breaks, and the generated fragments splash and injure nearby staff.

As shown in Figures 9 and 10, a detection rod 75 is slidably sleeved in the installation cylinder 510, and a clamping plate 77 is fixedly connected to the upper and lower ends of the detection rod 75. The detection rod 75 is located in the installation cylinder 510 and is fixedly connected to two groups of first triangular plates 76. Two groups of second triangular plates 78 are slidably sleeved in the installation cylinder 510. The two groups of second triangular plates 78 are located on the upper side of the first triangular plates 76 and are arranged opposite to the first triangular plates 76. The two groups of second triangular plates 78 are fixedly connected to the side away from the installation cylinder 510 with a sensor 79. The outer sides of the first triangular plates 76 and the second triangular plates 78 are both smooth. The lower side of the lowermost clamping plate 77 is fixedly connected to the connecting rod 73, and the lower side of the connecting rod 73 is fixedly connected to the second trapezoidal plate 72. The side wall of the push plate 62 is fixedly connected to the first trapezoidal plate 71 through the connecting plate 74. The second trapezoidal plate 72 is located on the upper side of the first trapezoidal plate 71 and abuts against the first trapezoidal plate 71. The outer sides of the first trapezoidal plate 71 and the second trapezoidal plate 72 are both smooth.

First, the sensor 79 is an ordinary pressure sensor 79. The pressure sensor 79 is a device or apparatus that can sense pressure signals and convert pressure signals into usable output electrical signals according to certain rules. The sensor 79 is connected to the display screen through a wire and can transmit the generated electrical signal to the display screen. This is the conventional usage of the sensor 79 and no unnecessary elaboration is made. Since the outer sides of the first triangular plate 76 and the second triangular plate 78 are both smooth, the friction between the first triangular plate 76 and the second triangular plate 78 is small, and the outer sides of the first trapezoidal plate 71 and the second trapezoidal plate 72 are both smooth, so the friction between the first trapezoidal plate 71 and the second trapezoidal plate 72 is small. Secondly, when the object to be measured is stretched to the limit, the push plate 62 will drive the first trapezoidal plate 71 to move through the connecting plate 74, the first trapezoidal plate 71 drives the second trapezoidal plate 72 to move upward, and the second trapezoidal plate 72 drives the clamping plate 77 through the connecting rod 73 Move upward, the clamping plate 77 drives the detection rod 75 to move upward, and the detection rod 75 drives the upper clamping plate 77 to move upward, thereby causing all the detection rods 75 in the activated mounting tube 510 to move upward (the mounting tube 510 that has not been activated is still in place and has not moved, and this clamping plate 77 is not located on the upper side of the clamping plate 77 of the activated mounting tube 510), the detection rod 75 drives the first triangular plate 76 to move upward, the first triangular plate 76 drives the second triangular plate 78 to move away from the mounting tube 510, and the second triangular plate 78 drives the sensor 79 to move, and the sensor 79 and the object to be measured are against each other. When the surface of the object to be measured is uneven due to stretching, the pressure on the sensor 79 is different, which leads to different signals generated by the sensor 79. This signal is displayed on the display screen, and then a simple detection effect of the object to be measured after stretching can be achieved. During disassembly, the severely damaged parts can be analyzed and processed to improve the tensile test effect.

In the present invention, when it is necessary to perform a tensile test on the object to be measured, both ends of the object to be measured are fixed in the mechanical clamp 2, the first hydraulic rod 8 is started, the object to be measured is straightened first, and then the strain gauge 511 is attached to the outside of the object to be measured, the first hydraulic rod 8 is started again, and the tensile test operation begins. When the first hydraulic rod 8 straightens the object to be measured, the first hydraulic rod 8 drives the movable plate 9 to move upward, and the movable plate 9 drives the telescopic plate 508 and the first rack 507 to move upward. When the first rack 507 and the half gear 503 are against each other, the half gear 503 is driven to rotate, and the half gear 503 drives the rotating rod 501 to rotate, and the rotating rod 501 drives the first gear 502 to rotate, and the first gear 502 drives the second rack 512 to move, and the second rack 512 drives the limiting plate 505 to move, and the limiting plate 505 compresses the first spring 506, and the second rack 512 also drives the square tube 509 to move through the second spring 513. The movable installation cylinder 510 and the strain gauge 511 move. When the strain gauge 511 and the object to be measured are against each other, the second spring 513 is also compressed until the connection between the half gear 503 and the first rack 507 is disconnected. When the half gear 503 and the first rack 507 are at the critical point of disconnection, the first spring 506 and the second spring 513 are both in a compressed state, and the strain gauge 511 and the object to be measured are adhered together, thereby completing the patch operation of the strain gauge 511. After the tensile test of the object to be measured is completed, the first hydraulic rod 8 is started again, so that the first hydraulic rod 8 drives the moving plate 9 to move downward, and the moving plate 9 drives the telescopic plate 508 and the first rack 507 to move downward, and finally drives the installation cylinder 510 and the strain gauge 511 to move away from the object to be measured, so that the strain gauge 511 and the object to be measured are disconnected, thereby automatically completing the installation and removal operations of the strain gauge 511. Without the influence of external force, the third spring 65 is in a compressed state. 6 and 7. After the first hydraulic rod 8 is activated, the second hydraulic rod 61 is activated at the same time, and the second hydraulic rod 61 drives the push plate 62 to move in the direction close to the protective rod 63. After the push plate 62 and the protective plate 64 are abutted, the protective plate 64 and the protective rod 63 will be driven to move, as shown in FIG8, so that the protective rod 63 and the protective plate 64 are changed from the upper connection state to the lower connection state, and the deployment range of the protective rod 63 and the protective plate 64 becomes wider, gradually filling the space on the front and rear sides of the bracket 4, so that the space between the bracket 4 and the protective plate 64 gradually becomes a closed space, reducing the possibility that the measured object will suddenly break after being stretched to the limit, and the generated fragments will splash and injure nearby staff. When the measured object is stretched to the limit, the push plate 62 will drive the first trapezoidal plate 71 to move through the connecting plate 74, and the first trapezoidal plate 71 will drive the second trapezoidal plate 72 to move upward, and the second trapezoidal plate 72 will move upward through the connecting rod 73. The clamping plate 77 is driven to move upward, and the clamping plate 77 drives the detection rod 75 to move upward. The detection rod 75 drives the upper clamping plate 77 to move upward, thereby causing all the detection rods 75 in the activated mounting tube 510 to move upward (the mounting tube 510 that has not been activated is still in place and has not moved, and this clamping plate 77 is not located on the upper side of the clamping plate 77 of the activated mounting tube 510). The detection rod 75 drives the first triangular plate 76 to move upward, and the first triangular plate 76 drives the second triangular plate 78 to move away from the mounting tube 510. The second triangular plate 78 drives the sensor 79 to move, and the sensor 79 and the object to be measured are against each other. When the surface of the object to be measured is uneven due to stretching, the pressure on the sensor 79 is different, which leads to different signals generated by the sensor 79. This signal is displayed on the display screen, and then a simple detection effect of the object to be measured after stretching can be achieved. During disassembly, the severely damaged parts can be analyzed and processed to improve the tensile test effect.

Claims (7)

1. The tensile force testing machine with the protection function comprises a workbench (1) and two mechanical clamping jaws (2) used for clamping an object to be tested, and is characterized in that the workbench (1) is fixedly connected with a bracket (4) at the upper side, a first hydraulic rod (8) is fixedly connected at the inner upper side of the bracket (4), the output end of the first hydraulic rod (8) is fixedly connected with a movable plate (9), the movable plate (9) and the bracket (4) are connected in an up-down sliding manner, four groups of protection plates (3) are fixedly connected in the bracket (4) in a two-to-two symmetrical manner, a plurality of groups of strain plates (511) are arranged at the upper side of the workbench (1), a plurality of groups of patch assemblies (5) which automatically install the strain plates (511) on the object to be tested are arranged in the bracket (4), the patch assemblies (5) comprise a mounting cylinder (510), one side of the mounting cylinder (510) far away from the strain plates (511) is fixedly connected with a square cylinder (509), the square cylinder (509) is connected with a square cylinder (509) in a sliding manner, the square cylinder (509) is connected with a square cylinder (504) in a sliding manner, the square cylinder (509) is connected with the bottom of the second sliding rod (504) and the square rod (4) is connected with the square cylinder (504) in a sliding manner, the square rod (504) is fixedly connected with a limiting plate (505), and a first spring (506) is fixedly connected between the limiting plate (505) and the bracket (4).

2. The tensile testing machine with the protection function according to claim 1, wherein a second rack (512) is fixedly connected to the upper side of the square rod (504), a first gear (502) is connected to the upper side of the second rack (512) in a meshed mode, a rotating rod (501) is fixedly sleeved in the first gear (502), the rotating rod (501) is rotationally connected with the protection plate (3), a half gear (503) is fixedly sleeved on the outer side of the rotating rod (501), two telescopic plates (508) are symmetrically and fixedly connected to the lower side of the movable plate (9), and a first rack (507) is fixedly connected to the side wall of each telescopic plate (508).

3. The tensile testing machine with protection function according to claim 2, wherein a protection component for reducing injury to staff is installed in the support (4), the protection component comprises deep grooves (67), the deep grooves (67) are four groups, two groups of deep grooves (67) are formed in the workbench (1), two outer two groups of deep grooves (67) are formed in the upper inner wall of the support (4), a plurality of groups of protection rods (63) are installed in the support (4), the protection rods (63) penetrate through the deep grooves (67) and abut against the bottoms of the deep grooves (67), the outer sides of the protection rods (63) are fixedly sleeved with protection plates (64), each group of deep grooves (67) are internally provided with two groups of positioning plates (66) in a sliding mode, a third spring (65) is fixedly connected between the positioning plates (66), the two groups of positioning plates (66) and the protection rods (63) abut against each other, the workbench (1) and the outer sides of the support (4) are fixedly connected with two groups of second hydraulic rods (61), and the second hydraulic rods (61) are fixedly connected with the second hydraulic rods (61).

4. The tensile testing machine with a protection function according to claim 3, wherein a detection rod (75) is sleeved in the installation cylinder (510) in a vertically sliding manner, clamping plates (77) are fixedly connected to the upper end and the lower end of the detection rod (75), two groups of first set of triangles (76) are fixedly connected to the detection rod (75) in the installation cylinder (510), two groups of second set of triangles (78) are sleeved in the installation cylinder (510) in a vertically sliding manner, the two groups of second set of triangles (78) are arranged on the upper side of the first set of triangles (76) and are opposite to the first set of triangles (76), and a sensor (79) is fixedly connected to one side, away from the installation cylinder (510), of the two groups of second set of triangles (78).

5. The tensile testing machine with the protection function according to claim 4, wherein a connecting rod (73) is fixedly connected to the lower side of the clamping plate (77) at the lowest side, a second trapezoid plate (72) is fixedly connected to the lower side of the connecting rod (73), a first trapezoid plate (71) is fixedly connected to the side wall of the push plate (62) through a connecting plate (74), and the second trapezoid plate (72) is located on the upper side of the first trapezoid plate (71) and abuts against the first trapezoid plate (71).

6. The tensile testing machine with the protection function according to claim 5, wherein the outer sides of the first triangular plate (76) and the second triangular plate (78) are both smooth.

7. The tensile testing machine with the protection function according to claim 6, wherein the outer sides of the first trapezoid plate (71) and the second trapezoid plate (72) are both arranged smoothly.