Metal material tensile property detection device

Abstract

The invention relates to the technical field of tensile tests, in particular to a metal material tensile property detection device which comprises a detection chamber, and the temperature in the detection chamber can be adjusted; the stretching mechanism is arranged in the detection chamber and used for stretching the sample in the transverse direction, the stretching mechanism comprises two clamps and a driving part, and the two clamps are movably arranged in the transverse direction; the material receiving groove is formed in the inner bottom of the detection chamber and is positioned below the clamp; the material pushing mechanism comprises a driving module and two material pushing parts, the two material pushing parts are located in the material receiving groove and can move relative to the material receiving groove in the transverse direction, and the driving module is used for driving the two material pushing parts to be close to or away from each other in the transverse direction; the detection unit is configured as follows: when the two material pushing parts push the end parts of the two sections of samples falling into the material receiving groove to abut against each other, the driving module stops acting immediately; therefore, hands can be prevented from being scalded, and the problem of inaccurate measurement caused by shortening of the sample after the sample is taken out for measurement can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of tensile test, and particularly to a device for detecting the tensile properties of metal materials. Background Art

[0002] Generally, it is necessary to detect the tensile properties of metal materials. One of the indicators is the elongation rate of the metal material. The specific detection method is as follows: First, record the initial length L1 of the metal material specimen, then load the specimen into the tensile testing machine, and rely on the tensile testing machine to axially stretch the specimen until the specimen is broken; then take out the two broken specimens, align them axially, and make their end sides abut against each other, and then measure the length formed by splicing the two aligned specimens, denoted as L2. At this time, the elongation rate is (L2 - L1) / L1.

[0003] Generally speaking, the tensile test of metal materials is carried out at room temperature. However, in some tests, it is necessary for the tensile testing machine to simulate the tensile test of metal materials under high-temperature environments to detect the tensile properties of metal materials under high-temperature environments; for such tests, the tensile testing machine generally has a detection chamber whose temperature can be set. The tensile test of the specimen is carried out at the set temperature in the detection chamber. After the tensile test is completed, the specimen is taken out of the detection chamber and the two sections are spliced and the length L2 is measured to finally calculate the elongation rate.

[0004] It can be seen that when the above-mentioned tensile testing machine capable of heating is used, after the specimen is broken, it is necessary to take out the specimen from the detection chamber and then splice and measure it. Therefore, the following problems will occur. First, since the specimen is tested in a high-temperature environment, the specimen is still in a high-temperature state after being broken. Therefore, when taking out the specimen from the detection chamber, it is easy to be scalded; furthermore, after the specimen is taken out, the outside temperature is much lower than the temperature of the specimen, so the specimen will experience thermal expansion and contraction, resulting in a slight shortening of the length of the specimen compared to before it was taken out of the detection chamber, thus making the measured data inaccurate and affecting the calculation of the elongation rate. Summary of the Invention

[0005] In order to solve at least one technical problem mentioned in the background art, the purpose of the present invention is to provide a device for detecting the tensile properties of metal materials.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A device for detecting the tensile properties of metal materials, comprising: A detection chamber, the internal temperature of which is adjustable; A tensile mechanism, which is arranged in the detection chamber and is used to stretch the specimen horizontally. It includes two clamps and a driving member. The two clamps are movably arranged horizontally, and the driving member is used to drive the two clamps to approach / separate from each other horizontally; It further includes: A material receiving groove is provided at the inner bottom of the detection chamber and below the fixture. The material receiving groove extends horizontally and has a V-shaped structure with a wider upper part and a narrower lower part in cross-section. A material pushing mechanism includes a driving module and two material pushing members. The two material pushing members are located in the material receiving groove and can move horizontally relative to the material receiving groove. The driving module is used to drive the two material pushing members to move closer to / away from each other horizontally. A detection unit is configured such that when the two material pushing members push the ends of two specimens falling into the material receiving groove to abut against each other, the driving module immediately stops operating. A measuring mechanism is used to detect the distance between the two material pushing members.

[0007] Compared with the prior art, the advantages of adopting this solution are as follows: In this solution, after the specimen is broken, the ends of the two specimens can be butt-jointed in the detection chamber, and the measuring mechanism is used to calculate the two butt-jointed specimens to obtain the total length of the specimen after being broken. It can be seen that the measuring operation of the specimen in this solution is carried out in the detection chamber without opening the detection chamber, so that the human hand can be avoided from being scalded. In addition, since the measurement is carried out in the detection chamber, the temperature of the detection chamber is still the set temperature at this time, so that the problem of inaccurate measurement caused by the shortening of the specimen generated after taking out the specimen for measurement can be avoided.

[0008] Secondly, in this solution, the two material pushing members are used to push the two specimens for end butt-joint. Thus, when the ends of the two specimens abut against each other, the distance between the two material pushing members is the length of the butt-jointed specimen. The difficulty lies in how to judge whether the ends of the two specimens abut against each other. Since the whole process is carried out inside the detection chamber, it is obviously very difficult to rely on human eye observation. Therefore, in this solution, a detection unit is provided. As long as the detection unit detects that the ends of the two specimens abut against each other, the driving module immediately stops operating. It can be seen that in this solution, when the ends of the two specimens abut against each other, the driving module can automatically stop without manual judgment and control.

[0009] Furthermore, in this solution, a V-shaped material receiving groove is provided. After the round shaft-shaped specimen falls into the material receiving groove, the V-shaped material receiving groove can play a centering role on the two specimens, so that the two specimens are basically kept in a coaxial state. Thus, when the subsequent two material pushing members push the two specimens to butt-joint, they can butt-joint in a basically coaxial state.

[0010] Preferably, the detection unit includes a power supply circuit, a current detection component, and a controller. The two material pushing members are made of conductive materials and are connected in series on the power supply circuit. When the two material pushing members are connected, the power supply circuit is turned on. The current detection component is arranged on the power supply circuit to detect whether the power supply circuit is turned on. When the power supply circuit is turned on, the current detection component feeds back a conduction signal to the controller, and the controller controls the driving module to stop operating according to this signal.

[0011] Preferably, two sliding seats are arranged in the detection chamber and are arranged to slide horizontally. The driving member is connected to the two sliding seats and is used to drive the two sliding seats to approach / separate from each other horizontally; two jigs are respectively rotatably arranged on the two sliding seats; the jig is linked with a linkage assembly. When the two sliding seats slide in the direction of separating from each other to a preset position, the jig is flipped by at least 100° under the action of the linkage assembly.

[0012] Preferably, the linkage assembly includes a gear and a rack. The rack is fixedly connected to the top of the material receiving groove and extends horizontally; the jig is rotatably arranged on the sliding seat through a rotating shaft, and the gear is fixedly sleeved on the rotating shaft and is used to mesh with the rack.

[0013] Preferably, an arc-shaped guide groove is arranged on the sliding seat, and the arc-shaped guide groove is concentric with the rotating shaft; a convex column is arranged on the side wall of the jig close to the chute, and the convex column is slidably arranged in the arc-shaped guide groove.

[0014] Preferably, the measuring mechanism includes a laser rangefinder. The laser rangefinder is installed on one of the pushing members, and its laser emission direction faces the other pushing member; alternatively, the measuring mechanism includes a scale arranged horizontally on the inner side wall of the material receiving groove.

[0015] Preferably, the jig includes a base body, a cylinder and a pressing head. A V-shaped clamping groove is formed on the upper surface of the base body. The pressing head is horizontally slidably arranged on the upper surface of the base body, and the bottom wall of the pressing head close to one end of the clamping groove is inclined to form a pressing surface. The cylinder is fixed on the base body to drive the pressing head to slide horizontally.

[0016] Preferably, the driving module is a linear module, which is arranged at the bottom of the material receiving groove and extends horizontally. A horizontally extending through hole is formed in the bottom of the material receiving groove, and the lower part of the pushing member passes through the through hole downward to be connected with the driving module.

[0017] Preferably, the linear module is a ball screw linear module, which includes a slide rail, two sliders slidably arranged on the slide rail, and a ball screw rotatably arranged on the slide rail. Two threaded sections with opposite thread directions are arranged on both sides of the ball screw, and the two sliders are respectively threadedly connected to the two threaded sections of the ball screw.

[0018] Other advantages and effects of the present invention are specifically explained in the drawings and the detailed implementation part. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a structural schematic diagram of the present invention; Figure 2 is a structural schematic diagram of the present invention after removing the heat insulation cover; Figure 1 ; Figure 3 is a structural schematic diagram of the present invention after removing the heat insulation cover; Figure 2 ; Figure 4 Schematic structural diagram when the fixture is in the 0° state after the specimen is broken; Figure 5 Schematic structural diagram when the fixture is in the 180° state after the specimen is broken; Figure 6 For Figure 5 Enlarged view of part A in Figure 7 Cross-sectional view of the material receiving groove; Figure 8 Cross-sectional view of the driving module; Figure 9 Exploded view of the sliding seat and the fixture; Figure 10 Diagram of the butt joint state of the broken ends of two specimens in the case of broken end misalignment; Figure 11 Diagram of the butt joint state of the original ends of two specimens; Figure 12 Schematic diagram of the detection unit. Specific implementation mode

[0019] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0020] In the following description, terms indicating orientation or positional relationship such as "inner", "outer", "upper", "lower", "left", "right", etc. are only for the convenience of describing the embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0021] Please refer to Figures 1-11 As shown, this embodiment provides a tensile property detection device, which is mainly applied to the tensile property detection of round shaft-shaped metal materials, such as round steel shafts, round copper shafts, etc. It should be noted that during the detection, metal material specimens are mainly used, hereinafter referred to as specimens, as shown in part a in the figure.

[0022] This device mainly includes a detection chamber 10, a tensile mechanism, a material receiving groove 4, a material pushing mechanism, a detection unit, and a measuring mechanism. The following is a specific description of each mechanism; The temperature inside the detection chamber 10 is adjustable; specifically, as Figure 1As shown in the figure, it includes a machine platform 11, on which a heat insulation cover 12 is covered. A detection chamber 10 is formed between the heat insulation cover 12 and the machine platform 11. There is an operation opening 121 at the front side of the detection chamber 10. A person loads or unloads a specimen from the detection chamber 10 through this operation opening 121. In addition, the operation opening 121 is equipped with an openable door, which can be a side-sliding door, a flipping door, etc., mainly used to cover the operation opening 121.

[0023] In addition, an electric heating element is provided in the heating chamber, and the heating in the detection chamber 10 is realized through the electric heating element to adjust the temperature in the detection chamber 10.

[0024] As Figure 2 and Figure 3 As shown in the figure, a stretching mechanism is arranged in the detection chamber 10 for stretching the specimen in the transverse direction. It includes two clamps 2 and a driving member. The two clamps 2 are arranged to move in the transverse direction. Specifically, two sliding seats 3 that can slide in the transverse direction are slidably arranged on the surface of the machine platform 11. The two clamps 2 are respectively installed on the two sliding seats 3. The driving member drives the two sliding seats 3 to move transversely, so that the two clamps 2 move closer to / away from each other in the transverse direction. For example, during stretching, relying on the driving member to drive the two sliding seats 3 to move away from each other, so that the two clamps 2 move away from each other, thus pulling the specimen to both sides to realize the stretching of the specimen.

[0025] The driving member includes two hydraulic cylinders 112 that can expand and contract in the transverse direction. The two hydraulic cylinders 112 are fixed on the machine platform 11. The two hydraulic cylinders 112 respectively correspond to the two sliding seats 3. The shaft ends of the hydraulic cylinders 112 are fixed to the sliding seats 3, and the sliding seats 3 are driven to move transversely through the expansion and contraction actions of the hydraulic cylinders 112.

[0026] As Figure 4 and Figure 7 As shown in the figure, a receiving trough 4 is arranged at the inner bottom of the detection chamber 10 and is located below the clamp 2. Specifically, it is fixed on the machine platform 11; the receiving trough 4 extends in the transverse direction and has a V-shaped structure with a wider upper part and a narrower lower part. The receiving trough 4 is mainly used to receive the two specimens after being broken after the specimen is pulled. The reason for setting it as a V shape is that after the round shaft-shaped specimen falls into the receiving trough 4, the V-shaped receiving trough 4 can center the two specimens, so that the two specimens are basically in a coaxial state. In this way, when the two pushing members 51 push the two specimens to dock later, they can dock in a basically coaxial state.

[0027] The pushing mechanism is mainly used to push the two specimens formed after the original specimen is broken and falls into the receiving trough 4 in the direction of approaching each other until the ends of the two specimens are docked and abutted, so as to measure the total length of the two specimens after docking later.

[0028] Among them, the pushing mechanism mainly includes a driving module and two pushing members 51. The two pushing members 51 are located in the receiving groove 4 and can move horizontally relative to the receiving groove 4. The driving module is used to drive the two pushing members 51 to move closer to / away from each other horizontally.

[0029] After the test sample falls into the receiving groove 4 in this way, the two pushing members 51 move in the direction of approaching each other under the drive of the driving module. During this process, the two sections of the test sample are pushed by the two pushing members 51 to move in the direction of approaching each other, and finally the end parts are abutted.

[0030] In this embodiment, the driving module preferably adopts a linear module, that is, a power module capable of linear motion. Since the pushing member 51 is located in the receiving groove 4, in order to avoid the interference of the existence of the receiving groove 4 on the connection between the driving module and the pushing member 51, in this embodiment: The driving module is arranged at the bottom of the receiving groove 4 and extends horizontally, so that the driving module makes a linear motion horizontally. A horizontally extending through hole 41 is opened at the bottom of the receiving groove 4. The lower part of the pushing member 51 extends downward to form a connecting section, and the connecting section passes downward through the through hole 41 to be connected with the driving module, and the connecting section can move horizontally along the through hole 41.

[0031] Among them, in order to be able to drive the two pushing members 51 to approach or move away from each other simultaneously by one power source, in this embodiment, the driving module preferably adopts a lead screw linear module. Specifically: Combined with Figure 7 and Figure 8 As shown, the driving module includes a slide rail 521 fixed on the surface of the machine table 11, two sliders 523 slidably arranged on the slide rail 521, and a lead screw 522 rotatably arranged on the slide rail 521. Of course, it also includes a motor (not shown in the figure) for driving the lead screw 522 to rotate.

[0032] Both sides of the lead screw 522 have two thread sections with opposite thread directions, that is, the lead screw 522 adopts a double-thread lead screw; the two sliders 523 are respectively threadedly connected to the two thread sections of the lead screw 522, and the connecting sections of the two pushing members 51 are respectively fixed on the two sliders 523; in this way, as long as the motor drives the lead screw 522 to rotate, the two sliders 523 will move synchronously in opposite directions to realize pushing; this way is meaningful in saving the power source, and as long as one motor is used as the power source, it can drive the two pushing members 51 to move towards each other.

[0033] To achieve the butt joint of the ends of two specimens, the core lies in when to control the motor to stop, that is, to control the driving module to stop acting, and then stop the pusher 51 from pushing the material continuously; normally, once the ends of the two specimens abut, the machine should be stopped immediately. Otherwise, if the motor continues to act after the two specimens abut, the pusher 51 will still continue to push the material at this time. In this way, it is easy to damage the pusher 51, and it is also possible to deform the specimen, affecting the subsequent measurement results.

[0034] Since the entire pusher 51 is located inside the detection chamber 10, it is obviously very difficult to rely solely on the human eye to judge whether the ends of the two specimens abut. Therefore, in this embodiment, a detection unit is provided to judge by the detection unit and control the driving module to stop. Specifically: The detection unit is configured such that when the ends of the two specimens pushed by the two pushers 51 and falling into the material receiving groove 4 abut, the driving module immediately stops acting.

[0035] As a specific implementation manner, as Figure 12 shown, the detection unit includes a power supply circuit, a current detection component, and a controller; the current detection component is arranged on the power supply circuit to detect whether current is generated in the power supply circuit, and then judge whether the power supply circuit is conducting. The current detection component can adopt an ammeter, a current detector, etc.; the two pushers 51 are made of conductive materials, such as copper plates, steel plates, etc.; it should be noted that the material receiving groove 4 is made of insulating material to avoid current transmission through the material receiving groove 4.

[0036] The two pushers 51 are connected in series on the power supply circuit. At this time, on the power supply circuit, the two pushers 51 are equivalent to an open circuit. As long as they are not connected, no current is generated on the power supply circuit, and at this time, the current detection component generates no conduction signal; once the two pushers 51 are connected, the power supply circuit is conducted. At this time, the current detection component will feedback a conduction signal to the controller, and the controller controls the driving module to stop acting according to this signal, so that the pusher 51 stops moving. The controller mainly controls the action of the motor.

[0037] In this way, when the two pushers 51 push the material in the direction of approaching each other for the butt joint of the ends of the two specimens, as long as the ends of the two specimens do not contact, the two pushers 51 are in an unconnected state at this time, and the power supply circuit is not conducted, so that the current detection component has no conduction signal feedback; once the ends of the two specimens abut, the two specimens after contact are equivalent to a bridge, connecting the two pushers 51, so that the power supply circuit is conducted. At this time, the current detection component detects current, and thus the controller controls the motor to stop rotating, and the two pushers 51 stop pushing the material.

[0038] It can be seen that by setting the above detection unit, when pushing the material, once the ends of the two specimens are butted, the pusher 51 will automatically stop pushing the material, without manual control and judgment, greatly simplifying the operation.

[0039] The measuring mechanism is used to detect the distance between the two pusher members 51. It should be noted that since the two specimens ultimately rely on the two pusher members 51 to push against each other, the distance between the two pusher members 51 is equivalent to the total length after the two specimens are butted. Therefore, only the distance between the two push plates needs to be measured.

[0040] Among them, the measuring mechanism includes a laser rangefinder. The laser rangefinder is installed on one of the pusher members 51, and its laser emission direction faces the other pusher member 51. In this way, after the ends of the two specimens are butted, when the laser rangefinder is turned on, the distance between the two pusher members 51 can be directly obtained by means of laser ranging.

[0041] Of course, the measuring mechanism can also be a more traditional method. For example, a horizontally arranged scale is provided on the inner groove wall of the receiving groove 4. In this way, after the subsequent test chamber 10 cools down, the scales corresponding to the two pusher members 51 on the scale can be directly observed, so as to calculate the distance between the two pusher members 51.

[0042] In this embodiment, the specific structure of the fixture 2 is as follows: As Figure 6 and Figure 9 shown, the fixture 2 includes a base body 21, a cylinder 23 and a pressing head 22. A V-shaped clamping groove 211 is formed on the upper surface of the base body 21. The pressing head 22 is horizontally slidably arranged on the upper surface of the base body 21, and the bottom wall of the pressing head 22 near one end of the clamping groove 211 is inclined to form a pressing surface 221. The cylinder 23 is fixed on the base body 21 to drive the pressing head 22 to slide horizontally.

[0043] When clamping the specimen, the end of the specimen can be placed in the clamping groove 211, and then the cylinder 23 is controlled to contract, thereby driving the pressing head 22 to slide horizontally towards the side close to the clamping groove 211. At this time, the pressing surface 221 of the pressing head 22 will finally press the specimen in the clamping groove 211. When the specimen needs to be released, as long as the cylinder 23 is controlled to extend, at this time the pressing head 22 will move away from the side of the clamping groove 211 to loosen the specimen. Under the action of its own gravity, the specimen will fall downward into the receiving groove 4 to perform subsequent operations.

[0044] It should be noted that for the convenience of subsequent description, in this embodiment, the end of the specimen that is broken is denoted as the broken end, and the end clamped by the fixture 2 is denoted as the original end. It can be understood that when a round shaft-shaped specimen is broken, its broken end will undergo necking to form a broken end similar to a conical head, as Figure 10 and Figure 11 shown.

[0045] Thus, after the specimen is broken, if the fixture 2 is directly released and the specimen falls into the material receiving groove 4, the broken ends of the two specimens are in a relative state. In this way, when the subsequent pusher 51 pushes the material, the two broken ends will finally abut against each other.

[0046] Normally, if the broken ends of the two specimens are basically still at the central axis position of the specimen, such butt joint measurement has no substantial impact.

[0047] However, there are also some relatively extreme situations, that is, as Figure 10 shown, the finally formed broken ends are not on the central axis L of the specimen, but deviate to one side. At this time, when docking in the way that the broken ends are opposite, it is possible that the two broken ends do not directly dock at the end positions, but there is a dislocation between their ends. At this time, there is an overlapping distance h between the two broken ends. Obviously, the subsequent measured length data is not accurate enough. Therefore, in this embodiment, in order to overcome this defect, further improvement is made: The two fixtures 2 are respectively rotatably arranged on the two sliding seats 3. Specifically, as Figure 9 shown, a rotating shaft 212 is fixed on the base body 21 of the fixture 2, and the base body 21 is rotatably arranged on the sliding seat 3 through the rotating shaft 212; each fixture 2 is linked with a linkage component. The specific linkage method is that when the two sliding seats 3 slide away from each other to a preset position, the fixture 2 is flipped at least 100° under the action of the linkage component, preferably 180°. Here, the two fixtures 2 are flipped to the side away from each other. For example, the fixture 2 on the left is flipped to the left, and the fixture 2 on the right is flipped to the right.

[0048] Among them, as Figure 4 、 Figure 6 and Figure 9 shown, the linkage component includes a gear 214 and a rack 42. The rack 42 is fixed to the top of the material receiving groove 4 and extends horizontally; the gear 214 is fixedly sleeved on the rotating shaft 212, and the gear 214 is located above the rack 42 and on the extending path of the rack 42 for meshing with the rack 42.

[0049] In addition, as Figure 9 shown, an arc-shaped guide groove 31 is provided on the sliding seat 3. The arc-shaped guide groove 31 is concentric with the rotating shaft 212. The central angle between the first end D1 and the second end D2 of the arc-shaped guide groove 31 is 180°. A convex column 213 is provided on the side wall of the base body 21 close to the sliding groove. The convex column 213 is slidably arranged in the arc-shaped guide groove 31; in this way, it is ensured that when the fixture 2 is flipped, the convex column 213 makes a circular sliding in the arc-shaped guide groove 31. The cooperation between the convex column 213 and the arc-shaped guide groove 31 limits the flipping range of the fixture 2, that is, from 0° to 180°.

[0050] In the initial state, that is, when the specimen is clamped on the two fixtures 2 before stretching, the notch of the clamping groove 211 of the fixture 2 faces upward, and at this time, the fixture 2 is in the 0° position (as shown in Figure 4 the state shown), the convex post 213 falls on the first end D1 of the arc-shaped guide groove 31; when the fixture 2 moves laterally during the specimen stretching process, after the specimen is broken, the fixture 2 continues to move laterally. When the gear 214 moves to the position of the rack 42, with the continuous movement of the fixture 2, under the action of the rack 42, the gear 214 starts to rotate, thereby driving the fixture 2 to flip. Finally, the fixture 2 flips 180°, thereby driving the broken specimen to flip 180° as shown in Figure 5 the state shown; at this time, the convex post 213 falls into the second end D2 of the arc-shaped guide groove 31. At this time, the notch of the clamping groove 211 faces downward. At this time, as long as the air cylinder 23 is controlled to release the specimen, the specimen will fall into the receiving groove 4. In this way, the two specimens falling into the receiving groove 4 are in a state where the original ends are opposite; then the subsequent pusher work can be carried out. Finally, the original ends of the two specimens are in contact and abut against each other (as shown in Figure 11 the state shown), achieving connection. Since the original ends are basically flat, there will be no situation where the broken ends overlap and affect the measurement results when the two original ends are butted.

[0051] In addition, in order to enable the fixture 2 to automatically stop moving after flipping 180°, in this embodiment, a proximity switch (not shown in the figure) is provided at the second end D2 of the arc-shaped guide groove 31, which is connected to the controller. When the convex post 213 falls into the second end D2, the proximity switch is triggered, and the controller controls the hydraulic cylinder 112 corresponding to the fixture 2 to stop acting, so that the fixture 2 stops moving laterally.

[0052] In addition, since the fixture 2 can basically maintain a 0° posture to reach the position of the rack 42 after the specimen is broken, in this embodiment, a magnet (not shown in the figure) is provided in the first end D1 of the arc-shaped guide groove 31, and the convex post 213 is an element that can be adsorbed by the magnet, such as iron, or also a magnet structure. In this way, when the fixture 2 is at 0°, the convex post 213 can be adsorbed by the magnet at the first end D1 of the arc-shaped guide groove 31 to maintain the 0° posture of the fixture 2; when the gear 214 of the fixture 2 travels to the position of the rack 42, the fixture 2 overcomes the adsorption force of the magnet and starts to flip.

[0053] It should be noted that actually, even without setting the magnet, the fixture 2 can basically maintain a 0° posture after the specimen is broken. Because after the specimen is broken, the center of gravity of the specimen is located on the side of the fixture 2 close to the other fixture 2. Therefore, under the pressure of the specimen, the fixture 2 has a tendency to flip to the side of the other fixture 2. And under the limit of the convex post 213 (at this time, the convex post 213 is located at the first end D1 of the arc-shaped guide groove 31), the fixture 2 is kept in the 0° posture; the purpose of setting the magnet is to enable the fixture 2 to maintain a more stable 0° posture.

[0054] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

Claims

1. A tensile property testing device for metal materials, comprising: A testing chamber, the temperature inside which is adjustable; A tensile mechanism, arranged inside the testing chamber for realizing tensile of a specimen along the transverse direction, which includes two clamps and a driving member. The two clamps are arranged to move along the transverse direction, and the driving member is used to drive the two clamps to move closer to / away from each other along the transverse direction; It is characterized in that it further includes: A material receiving groove, arranged at the inner bottom of the testing chamber and below the clamps. The material receiving groove extends along the transverse direction and has a V-shaped structure with a wider upper part and a narrower lower part; A material pushing mechanism, including a driving module and two material pushing members. The two material pushing members are located in the material receiving groove and can move relative to the material receiving groove along the transverse direction. The driving module is used to drive the two material pushing members to move closer to / away from each other along the transverse direction; A detection unit, which is configured to, when the two material pushing members push the ends of two specimens falling into the material receiving groove to abut against each other, immediately stop the driving module from operating; A measuring mechanism, used to detect the distance between the two material pushing members.

2. The tensile property detection device for a metal material according to claim 1, characterized in that, The detection unit includes a power supply circuit, a current detection component and a controller; the two material pushing members are made of conductive materials, and the two material pushing members are connected in series on the power supply circuit. When the two material pushing members are connected, the power supply circuit is turned on; the current detection component is arranged on the power supply circuit to detect whether the power supply circuit is turned on. When the power supply circuit is turned on, the current detection component feeds back a conduction signal to the controller, and the controller controls the driving module to stop operating according to this signal.

3. The tensile property detection device for a metal material according to claim 1, wherein Two sliding seats are arranged inside the testing chamber to slide along the transverse direction. The driving member is connected to the two sliding seats to drive the two sliding seats to move closer to / away from each other along the transverse direction; the two clamps are respectively rotatably arranged on the two sliding seats; the clamp is linked with a linkage component. When the two sliding seats slide to a preset position in the direction of moving away from each other, the clamp is flipped by at least 100° under the action of the linkage component.

4. A tensile property testing device for a metal material according to claim 3, characterized in that, The linkage component includes a gear and a rack. The rack is fixedly connected to the top of the material receiving groove and extends along the transverse direction; the clamp is rotatably arranged on the sliding seat through a rotating shaft, and the gear is fixedly sleeved on the rotating shaft to mesh with the rack.

5. A tensile property detection device for a metal material according to claim 4, characterized in that, An arc-shaped guide groove is arranged on the sliding seat, and the arc-shaped guide groove is concentric with the rotating shaft; a convex column is arranged on the side wall of the clamp close to the chute, and the convex column is slidably arranged in the arc-shaped guide groove.

6. The tensile property detection device for a metal material according to claim 1, characterized in that, The measuring mechanism includes a laser rangefinder, which is installed on one of the material pushing members and its laser emission direction faces the other material pushing member; alternatively, the measuring mechanism includes a scale arranged along the transverse direction on the inner side wall of the material receiving groove.

7. The tensile property detection device for a metal material according to claim 1, characterized in that, The clamp includes a base body, a cylinder and a pressing head. A V-shaped clamping groove is opened on the upper surface of the base body. The pressing head is horizontally slidably arranged on the upper surface of the base body, and the bottom wall of the pressing head close to the clamping groove is inclined to form a pressing surface. The cylinder is fixed on the base body to drive the pressing head to slide horizontally.

8. The tensile property detection device for a metal material according to claim 1, characterized in that, The driving module is a linear module, which is arranged at the bottom of the material receiving groove and extends along the transverse direction. A horizontally extending through hole is opened on the bottom of the material receiving groove, and the lower part of the material pushing member passes through the through hole downward to be connected with the driving module.

9. The tensile property detection device for a metal material according to claim 1, wherein, The linear module is a ball screw linear module, which includes a slide rail, two sliders slidably arranged on the slide rail, and a ball screw rotatably arranged on the slide rail. Both sides of the ball screw have two thread segments with opposite thread directions, and the two sliders are respectively threadedly connected to the two thread segments of the ball screw.

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