A high-temperature tensile testing device and method for molybdenum and molybdenum alloy rods

Abstract

The present application discloses a high-temperature tensile testing device and method for molybdenum and molybdenum alloy rods, wherein the high-temperature tensile testing device for molybdenum and molybdenum alloy rods includes a universal testing machine, a high-temperature box, a first clamping assembly, and a second clamping assembly. The high-temperature tensile testing method for molybdenum and molybdenum alloy rods uses the crossbeam of the universal testing machine to pull a cooling head, which in turn pulls an elastic jacket via a connecting shaft. The elastic jacket moves toward the cooling head, thereby gradually increasing the clamping force of the elastic jacket clamping the test workpiece until the limit surface of the elastic jacket abuts against the outer jacket. The crossbeam of the universal testing machine continues to pull the cooling head, and the elastic jacket drives the outer jacket to move toward the cooling head, thereby continuing the tensile test. This achieves the technical effect of gradually increasing the clamping force of the clamping assembly through the tensile force during the tensile process, and can cool the clamping assembly in the high-temperature box, thereby improving the reliability and service life of the tensile testing device.

Description

Technical Field

[0001] The present application relates to the field of tensile testing technology, and in particular to a high-temperature tensile testing device and method for molybdenum and molybdenum alloy rods. Background Art

[0002] High-temperature tensile testing equipment for molybdenum and molybdenum alloy rods is mainly used to evaluate the mechanical properties of materials (such as tensile strength, yield strength, elongation, etc.) in high-temperature environments. It is suitable for high-temperature application scenarios such as aerospace, nuclear industry, and electronic devices.

[0003] Currently, tensile testing equipment can only clamp test fixtures, but cannot adjust the clamping force according to the loading force. Furthermore, clamping the test workpiece is complex. Furthermore, cooling the clamping assembly only works outside the high-temperature chamber, not inside the chamber. Therefore, a tensile clamping assembly with higher clamping and cooling efficiency is urgently needed. Summary of the Invention

[0004] The present invention provides a high-temperature tensile testing device and method for molybdenum and molybdenum alloy rods. These devices address the technical issues of conventional tensile testing devices, such as the unadjustable clamping force during the stretching process, the risk of workpiece detachment in high-temperature environments, and the limited cooling range and poor cooling effect of conventional clamping assemblies. The present invention achieves the technical effect of gradually increasing the clamping force of the clamping assembly through the tensile force during the stretching process, and can cool the clamping assembly within the high-temperature chamber, thereby improving the reliability and service life of the tensile testing device.

[0005] In the first aspect, an embodiment of the present invention provides a high-temperature tensile testing device for molybdenum and molybdenum alloy rods, comprising a universal testing machine, a high-temperature box, a first clamping assembly and a second clamping assembly; the high-temperature box is arranged between the two beams of the universal testing machine and is connected to the universal testing machine; the first clamping assembly comprises an elastic jacket, a cam mechanism, a connecting shaft, an outer jacket and a cooling head; one end of the cooling head is connected to one of the beams of the universal testing machine, and the other end thereof is connected to the connecting shaft; the elastic jacket is arranged inside the outer jacket, and one end of the elastic jacket is detachably connected to the test workpiece, and the other end thereof is connected to the cooling head via the connecting shaft; the outer jacket It is slidingly connected to the high-temperature box; one end of the cam mechanism passes through the outer jacket and is rotationally connected to the elastic jacket, and the cam mechanism is configured to pull the elastic jacket toward or away from the cooling head during rotation; when the cam mechanism pulls the elastic jacket toward the cooling head, the elastic jacket clamps the test workpiece; when the cam mechanism pulls the elastic jacket away from the cooling head, the elastic jacket releases the test workpiece; the first clamping assembly and the second clamping assembly are arranged opposite to each other; one end of the second clamping assembly is connected to the other beam, and the other end thereof is connected to the test workpiece.

[0006] In combination with the first aspect, in a possible implementation, the first clamping assembly also includes a mounting seat and a sleeve; the mounting seat is also provided between the cooling head and the outer jacket; the sleeve is sleeved on the outside of the outer jacket and is connected to the high-temperature box, and the outer jacket is slidingly connected to the sleeve; one end of the cam mechanism passes through the sleeve and the outer jacket in sequence and is rotatably connected to the elastic jacket, and the cam mechanism is configured to pull the elastic jacket toward or away from the cooling head during rotation; the elastic jacket is provided with a mounting hole, and the test workpiece is provided in the mounting hole; an outer conical surface is provided on the outer side of the elastic jacket, and an inner conical surface is provided on the inner side of the outer jacket, and the outer conical surface and the inner conical surface are in contact with each other.

[0007] In combination with the first aspect, in a possible implementation, the elastic sleeve includes a pull rod and a plurality of jaws; the plurality of jaws are evenly distributed around the circumference, and the plurality of jaws are connected to the end of the pull rod away from the cooling head, and the end of the pull rod close to the cooling head is connected to the connecting shaft; the material of the jaws is an elastic material; when the outer conical surface and the inner conical surface slide relative to each other, the jaws are deformed, and the jaws are configured to clamp or release the test workpiece.

[0008] In combination with the first aspect, in a possible implementation, the elastic jacket includes a pull rod, a first elastic member and a plurality of jaws; the plurality of jaws are evenly distributed on the end face of the pull rod; a slider is provided on the jaw, and a slide groove is provided at one end of the pull rod close to the jaw; the jaw slides in the slide groove through the slider; a first elastic member is provided in the slide groove, one end of the first elastic member abuts against the pull rod, and the other end of the first elastic member is connected to the slider; when the cam mechanism pulls the elastic jacket to move away from the cooling head, the first elastic member returns to a natural state; when the cam mechanism pulls the elastic jacket to move toward the cooling head, the first elastic member is in a compressed state.

[0009] In combination with the first aspect, in a possible implementation, the cam mechanism includes an eccentric wheel, a rotating shaft and a sleeve; a mounting groove is provided on the outer sleeve, and the rotating shaft is arranged in the mounting groove; the sleeve is provided between the rotating shaft and the mounting groove; the sleeve is provided with an avoidance groove; one end of the rotating shaft extends out of the avoidance groove, and the other end of the rotating shaft is connected to the eccentric wheel, and the eccentric wheel is rotatably connected to the elastic sleeve.

[0010] In combination with the first aspect, in a possible implementation, the cam mechanism also includes a second elastic member and a clamping member; a rotation groove is provided on the sleeve, the clamping member is arranged in the rotation groove, and the clamping member is slidingly connected to the sleeve; the second elastic member is arranged in the installation groove; one end of the second elastic member is connected to the outer sleeve, and the other end of the second elastic member is connected to the clamping member.

[0011] In combination with the first aspect, in a possible implementation, it further includes a ball plunger; a ball plunger is provided on the side of the connecting shaft close to the cooling head; a clamping groove is provided on the cooling head, and the ball plunger is configured to be clamped with the cooling head through the clamping groove; when the cam mechanism pulls the elastic sleeve to move toward the cooling head, the ball plunger moves into the clamping groove; when the cam mechanism pulls the elastic sleeve to move away from the cooling head, the ball plunger moves away from the clamping groove toward the direction of the elastic sleeve.

[0012] In combination with the first aspect, in a possible implementation, it also includes a fixture cooling assembly, the fixture cooling assembly includes a water inlet tank and a hot water recovery tank, a water inlet pipe and a water outlet pipe; the water inlet tank contains cooling water; a first water inlet channel and a first water outlet channel are provided on the cooling head; the first water inlet channel and the first water outlet channel are connected; one end of the water inlet pipe is arranged in the water inlet tank, and the other end of the water inlet pipe is connected to the first water inlet channel; one end of the water outlet pipe is arranged in the hot water recovery tank, and the other end of the water outlet pipe is connected to the first water outlet channel; a water inlet hole and a water outlet hole are provided on the mounting seat; a second water inlet channel and a second water outlet channel are provided on the outer jacket; the water inlet hole is connected to the first water inlet channel and the second water inlet channel, and the water outlet hole is connected to the first water outlet channel and the second water outlet channel.

[0013] In a second aspect, an embodiment of the present invention provides a high-temperature tensile testing method for molybdenum and molybdenum alloy rods, using the high-temperature tensile testing device for molybdenum and molybdenum alloy rods according to the first aspect or in combination with any possible implementation of the first aspect, comprising the following steps:

[0014] Clamping the test workpiece: increasing the distance between the first clamping assembly and the second clamping assembly, placing the test workpiece between the first clamping assembly and the second clamping assembly, first clamping the test workpiece by the first clamping assembly, and then reducing the distance between the first clamping assembly and the second clamping assembly until the test workpiece is clamped by the second clamping assembly;

[0015] Heating of test workpiece: The high temperature box is heated to the target temperature at 20°C / min and kept warm for 15 minutes;

[0016] The test workpiece is loaded: stretched at a rate of 0.5 mm / min until fracture, and the data is recorded simultaneously;

[0017] Analysis of test results: Generate stress-strain curves and calculate high-temperature mechanical parameters.

[0018] In combination with the second aspect, in a possible implementation, the first clamping assembly further includes a sleeve, which is arranged on the outside of the outer jacket and connected to the high-temperature box, and the outer jacket is slidably connected to the sleeve; the outer side of the elastic jacket is provided with an outer conical surface, and the inner side of the outer jacket is provided with an inner conical surface, and the outer conical surface and the inner conical surface are in contact with each other; when the first clamping assembly clamps the test workpiece, the cam mechanism is rotated to move the elastic jacket toward the direction close to the cooling head; in this process, the outer conical surface of the elastic jacket and the inner conical surface of the outer jacket slide relative to each other, so that the elastic jacket contracts toward the test workpiece to preliminarily clamp the workpiece, and at the same time, the elastic jacket is clamped with the cooling head through the connecting shaft. After clamping, the elastic jacket is in contact with the cooling head. The cooling head forms a relatively fixed connection; during the loading process of the test workpiece, the cooling head is pulled by the crossbeam of the universal testing machine, and the cooling head pulls the elastic jacket through the connecting shaft; in the initial stage, the outer jacket is in a stationary state due to the friction of the sleeve, and the elastic jacket pulls the test workpiece to move toward the cooling head. There is friction between the elastic jacket and the test workpiece. As the elastic jacket moves toward the cooling head, the degree of squeezing of the test workpiece by the elastic jacket increases continuously, thereby gradually increasing the clamping force of the elastic jacket to clamp the test workpiece until the limit surface of the elastic jacket abuts against the end face of the outer jacket; the crossbeam of the universal testing machine continues to pull the cooling head, and at this time the elastic jacket drives the outer jacket to move toward the cooling head, thereby continuing the tensile test.

[0019] One or more technical solutions provided in this application have at least the following technical effects:

[0020] The embodiment of the present invention adopts a high-temperature tensile testing device and method for molybdenum and molybdenum alloy rods, wherein the high-temperature box is arranged between the two beams of a universal testing machine and is connected to the universal testing machine; the universal testing machine can provide a loading force to the test workpiece, and the two beams of the universal testing machine are respectively installed with a first clamping assembly and a second clamping assembly, wherein the first clamping assembly includes an elastic jacket, a cam mechanism, a connecting shaft, an outer jacket and a cooling head; one end of the cooling head is connected to one of the beams of the universal testing machine, and the other end thereof is connected to the outer jacket; the elastic jacket is arranged inside the outer jacket, and one end of the elastic jacket is connected to the test workpiece. The parts are detachably connected, and the other end is connected to the cooling head through a connecting shaft; the outer jacket is slidingly connected to the high-temperature box; one end of the cam mechanism passes through the outer jacket and is rotatably connected to the elastic jacket, and the cam mechanism is configured to pull the elastic jacket toward or away from the cooling head during rotation; the outer side of the elastic jacket is provided with an outer conical surface, and the outer jacket is provided with an inner conical surface, and the outer conical surface and the inner conical surface fit together; when the cam mechanism pulls the elastic jacket toward the cooling head, the elastic jacket clamps the test workpiece; when the cam mechanism pulls the elastic jacket toward the cooling head, the elastic jacket releases the test workpiece.

[0021] During the tensile test force loading process, the universal testing machine drives the cooling head to move, and the cooling head drives the elastic jacket relative to the outer jacket to move toward the cooling head through the connecting shaft. Since the elastic jacket and the outer jacket are matched through the inner and outer conical surfaces, the elastic jacket can apply a gradually increasing clamping force to the test workpiece at one end of the elastic jacket that matches the test workpiece during the movement toward the cooling head. During the clamping process, as the loading force increases, the first clamping component clamps the test workpiece more firmly. In addition, the elastic jacket is provided with a limited surface. Through the cooperation of the limited surface and the end face of the outer jacket, the maximum clamping force of the elastic jacket clamping the test workpiece can be limited, thereby preventing the elastic jacket from crushing the workpiece. In addition, when the limited surface of the elastic jacket abuts the end face of the outer jacket, the universal testing machine continues to stretch the test fixture. At this time, the elastic jacket can drive the outer jacket to continue to move toward the cooling head, thereby achieving the technical effect of a complete tensile test.

[0022] Furthermore, the present application is also provided with a fixture cooling device, which can not only cool the cooling head outside the high-temperature box, but also cool the outer jacket inside the high-temperature box.

[0023] This application addresses the technical issues in existing tensile testing equipment, such as the unadjustable clamping force during the stretching process, the risk of workpiece falling off in high-temperature environments, and the limited cooling range and poor cooling effect of traditional clamping assemblies. This application achieves the technical effect of gradually increasing the clamping force of the clamping assembly through the stretching force during the stretching process, and can cool the clamping assembly within the high-temperature chamber, thereby improving the reliability and service life of the tensile testing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of this application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A schematic diagram of a high-temperature tensile testing device for molybdenum and molybdenum alloy rods provided in an embodiment of the present application;

[0026] Figure 2 An axonometric view of a first clamping assembly and a second clamping assembly provided in an embodiment of the present application;

[0027] Figure 3 A front view of the first clamping assembly and the second clamping assembly provided in an embodiment of the present application;

[0028] Figure 4 for Figure 3AA cross-sectional view;

[0029] Figure 5 An axonometric view of a first clamping assembly provided in an embodiment of the present application;

[0030] Figure 6 A front view of a first clamping assembly provided in an embodiment of the present application;

[0031] Figure 7 for Figure 6 BB cross-sectional view;

[0032] Figure 8 for Figure 7 Enlarged view of point C;

[0033] Figure 9 A front view of the cam mechanism provided in an embodiment of the present application;

[0034] Figure 10 for Figure 9 DD axonometric section view.

[0035] Icons: 1-universal testing machine; 2-extensometer; 3-inert gas protection device; 4-flow channel baffle; 5-high temperature box; 51-first shell; 52-second shell; 53-sliding assembly; 531-screw; 532-screw pair; 533-support; 6-first clamping assembly; 61-elastic jacket; 611-pull rod; 6111-limiting surface; 6112-cam accommodating chamber; 612-clamping jaw; 6121-outer cone; 613-first elastic member; 614-slider; 615-slide; 62-cam mechanism; 621-eccentric wheel; 622-rotating shaft; 6 23-sleeve; 624-mounting groove; 626-second elastic member; 627-clamping member; 628-rotation groove; 63-mounting seat; 64-connecting shaft; 65-outer jacket; 651-second water inlet channel; 652-second water outlet channel; 653-inner cone; 66-sleeve; 661-avoidance groove; 67-cooling head; 671-first water inlet channel; 672-first water outlet channel; 673-clamping groove; 7-second clamping assembly; 8-clamp cooling assembly; 81-water inlet tank; 82-hot water recovery tank; 83-water inlet pipe; 84-water outlet pipe; 9-ball plunger. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] In the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present application. The terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] The embodiment of the present invention provides a high temperature tensile testing device for molybdenum and molybdenum alloy rods, such as Figure 1-10 As shown, it includes a universal testing machine 1, a high-temperature box 5, a first clamping assembly 6 and a second clamping assembly 7; the high-temperature box 5 is arranged between the two beams of the universal testing machine 1 and is connected to the universal testing machine 1; the first clamping assembly 6 includes an elastic jacket 61, a cam mechanism 62, a connecting shaft 64, an outer jacket 65 and a cooling head 67; one end of the cooling head 67 is connected to one of the beams of the universal testing machine 1, and the other end is connected to the connecting shaft 64; the elastic jacket 61 is arranged inside the outer jacket 65, and one end of the elastic jacket 61 is detachably connected to the test workpiece, and the other end is connected to the cooling head 67 through the connecting shaft 64; the outer jacket 65 is connected to the high-temperature box The body 5 is slidably connected; one end of the cam mechanism 62 passes through the outer jacket 65 and is rotatably connected to the elastic jacket 61, and the cam mechanism 62 is configured to pull the elastic jacket 61 toward or away from the cooling head 67 during the rotation; when the cam mechanism 62 pulls the elastic jacket 61 toward the cooling head 67, the elastic jacket 61 clamps the test workpiece; when the cam mechanism 62 pulls the elastic jacket 61 toward the cooling head 67, the elastic jacket 61 releases the test workpiece; the first clamping assembly 6 and the second clamping assembly 7 are arranged opposite to each other; one end of the second clamping assembly 7 is connected to another beam, and the other end thereof is connected to the test workpiece.

[0039] Illustratively, a limiting surface 6111 is provided on the end face of the elastic jacket 61. During the mutual movement between the elastic jacket 61 and the outer jacket 65, the limiting surface 6111 can fit with the end face of the outer jacket 65, thereby limiting the movement of the elastic jacket 61 and preventing the elastic jacket 61 from crushing the test workpiece due to excessive clamping force.

[0040] For example, a pin hole is provided on the cooling head 67 , and the cooling head 67 and the universal testing machine 1 can be installed and positioned through the pin hole.

[0041] Illustratively, a first mounting hole is provided on the connecting shaft 64, and a second mounting hole is provided on the cooling head 67. When the cam mechanism 62 is turned and the elastic sleeve 61 is moved toward the cooling head 67, the connecting shaft 64 is engaged with the cooling head 67. At this time, the first mounting hole and the second mounting hole are in a coaxial position, and a connecting rod is used to pass through the second mounting hole and the first mounting hole in sequence, thereby achieving a reliable connection between the connecting shaft 64 and the cooling head 67.

[0042] Exemplarily, the second clamping assembly 7 and the first clamping assembly 6 have the same structure.

[0043] Exemplarily, the high-temperature tensile testing equipment for molybdenum and molybdenum alloy rods further includes an extensometer 2 and an inert gas protection device 3 , wherein the detection end of the extensometer 2 extends into the high-temperature box 5 ; the inert gas protection device 3 is configured to supply inert gas into the high-temperature box 5 .

[0044] In the embodiment of this application, Figure 1-10 As shown, the first clamping assembly 6 also includes a mounting seat 63 and a sleeve 66; a mounting seat 63 is also provided between the cooling head 67 and the outer jacket 65; the sleeve 66 is sleeved on the outside of the outer jacket 65 and is connected to the high-temperature box 5, and the outer jacket 65 is slidingly connected to the sleeve 66; one end of the cam mechanism 62 passes through the sleeve 66 and the outer jacket 65 in sequence and is rotatably connected to the elastic jacket 61, and the cam mechanism 62 is configured to pull the elastic jacket 61 to move toward or away from the cooling head 67 during the rotation process; the elastic jacket 61 is provided with a mounting hole, and the test workpiece is provided in the mounting hole; an outer conical surface 6121 is provided on the outer side of the elastic jacket 61, and an inner conical surface 653 is provided on the inner side of the outer jacket 65, and the outer conical surface 6121 and the inner conical surface 653 are in contact with each other.

[0045] Exemplarily, one side of the mounting seat 63 is fixedly connected to the outer jacket 65 , and the other side of the mounting seat 63 abuts against the cooling head 67 .

[0046] For example, the sleeve 66 is slidably connected to the outer jacket 65. During the movement of the outer jacket 65, the sleeve 66 can ensure that the outer jacket 65 does not move eccentrically, thereby ensuring the test accuracy.

[0047] For example, there is a certain friction between the outer jacket 65 and the sleeve 66. In the initial stage, the elastic jacket 61 pulls the test workpiece toward the cooling head 67, and the outer jacket 65 is subjected to the friction of the sleeve 66 and is kept in a stationary state.

[0048] In the embodiment of this application, Figure 1-10As shown, the elastic sleeve 61 includes a pull rod 611 and a plurality of jaws 612; the plurality of jaws 612 are evenly distributed around the circumference, and the plurality of jaws 612 are all connected to the end of the pull rod 611 away from the cooling head 67, and the end of the pull rod 611 close to the cooling head 67 is connected to the connecting shaft 64; the material of the jaws 612 is an elastic material; when the outer conical surface 6121 and the inner conical surface 653 slide relative to each other, the jaws 612 are deformed, and the jaws 612 are configured to clamp or release the test workpiece.

[0049] Exemplarily, the material of the multiple jaws 612 is spring steel, and the multiple jaws 612 are fixedly connected to the pull rod 611; an outer conical surface 6121 is provided on the outer side of the jaw 612. When the outer conical surface 6121 moves relative to the inner conical surface 653, the jaw 612 contracts in a direction close to the test workpiece, thereby achieving the purpose of clamping the workpiece.

[0050] In the embodiment of this application, Figure 1-10 As shown, the elastic jacket 61 includes a pull rod 611, a first elastic member 613 and a plurality of jaws 612; the plurality of jaws 612 are evenly distributed on the end face of the pull rod 611; a slider 614 is provided on the jaw 612, and a slide groove 615 is provided at one end of the pull rod 611 close to the jaw 612; the jaw 612 slides in the slide groove 615 through the slider 614; a first elastic member 613 is provided in the slide groove 615, one end of the first elastic member 613 abuts against the pull rod 611, and the other end of the first elastic member 613 is connected to the slider 614; when the cam mechanism 62 pulls the elastic jacket 61 to move away from the cooling head 67, the first elastic member 613 returns to its natural state; when the cam mechanism 62 pulls the elastic jacket 61 to move toward the cooling head 67, the first elastic member 613 is in a compressed state.

[0051] Exemplarily, the plurality of clamping jaws 612 are all slidably connected to the pull rod 611. The cross-section of the slide groove 615 is convex-shaped. The slider 614 cooperates with the slide groove 615, allowing the slider 614 to slide smoothly within the slide groove 615 and preventing the slider 614 from detaching from the pull rod 611 in the axial direction of the pull rod 611. Furthermore, a first elastic member 613 is disposed within the slide groove 615, which enables the outer conical surface 6121 of the clamping jaw 612 to always fit together with the inner conical surface 653 of the outer jacket 65.

[0052] In the embodiment of this application, Figure 1-10As shown, the cam mechanism 62 includes an eccentric wheel 621, a rotating shaft 622 and a sleeve 623; a mounting groove 624 is provided on the outer sleeve 65, and the rotating shaft 622 is arranged in the mounting groove 624; a sleeve 623 is provided between the rotating shaft 622 and the mounting groove 624; the sleeve 66 is provided with an avoidance groove 661; one end of the rotating shaft 622 extends out of the avoidance groove 661, and the other end of the rotating shaft 622 is connected to the eccentric wheel 621, and the eccentric wheel 621 is rotatably connected to the elastic sleeve 61.

[0053] Exemplarily, a cam accommodating cavity 6112 is provided on the pull rod 611, and the eccentric wheel 621 is arranged in the cam accommodating cavity 6112. The cam accommodating cavity 6112 is rectangular, which can ensure that the pull rod 611 is driven to move toward or away from the cooling head 67 during the rotation of the eccentric wheel 621.

[0054] In the embodiment of this application, Figure 1-10 As shown, the cam mechanism 62 also includes a second elastic member 626 and a clamping member 627; a rotation groove 628 is opened on the sleeve 623, the clamping member 627 is arranged in the rotation groove 628, and the clamping member 627 is slidingly connected to the sleeve 623; the second elastic member 626 is arranged in the installation groove 624; one end of the second elastic member 626 is connected to the outer sleeve 65, and the other end of the second elastic member 626 is connected to the clamping member 627.

[0055] Exemplarily, the clamping member 627 is configured as a spherical structure, and the clamping member 627 is disposed in the rotating groove 628, which can realize the positioning of the second elastic member 626 and prevent the second elastic member 626 from falling off from the mounting groove 624. In addition, during the rotation of the rotating shaft 622, it is possible to drive the sleeve 623 to rotate. The spherical structure of the clamping member 627 can prevent the rotation of the sleeve 623 from pulling on the second elastic member 626, thereby improving the stability of the equipment operation.

[0056] In the embodiment of this application, Figure 1-10 As shown, it also includes a ball plunger 9; a ball plunger 9 is provided on the side of the connecting shaft 64 close to the cooling head 67; a snap-in groove 673 is provided on the cooling head 67, and the ball plunger 9 is configured to be snap-fitted with the cooling head 67 through the snap-in groove 673; when the cam mechanism 62 pulls the elastic sleeve 61 to move toward the cooling head 67, the ball plunger 9 moves into the snap-in groove 673; when the cam mechanism 62 pulls the elastic sleeve 61 to move away from the cooling head 67, the ball plunger 9 moves away from the snap-in groove 673 toward the elastic sleeve 61.

[0057] Illustratively, a first mounting hole is provided on the connecting shaft 64, and a second mounting hole is provided on the cooling head 67. When the cam mechanism 62 is turned and the elastic sleeve 61 is moved toward the cooling head 67, the connecting shaft 64 and the cooling head 67 are snap-connected through the ball plunger 9 and the snap-connecting groove 673. At this time, the first mounting hole and the second mounting hole are in a coaxial position, and a connecting rod is used to pass through the second mounting hole and the first mounting hole in sequence, thereby realizing a reliable connection between the connecting shaft 64 and the cooling head 67.

[0058] In the embodiment of this application, Figure 1-10 As shown, it also includes a fixture cooling assembly 8, which includes a water inlet tank 81 and a hot water recovery tank 82, a water inlet pipe 83 and a water outlet pipe 84; the water inlet tank 81 contains cooling water; a first water inlet channel 671 and a first water outlet channel 672 are provided on the cooling head 67; the first water inlet channel 671 and the first water outlet channel 672 are connected; one end of the water inlet pipe 83 is arranged in the water inlet tank 81, and the other end of the water inlet pipe 83 is connected to the first water inlet channel 671; one end of the water outlet pipe 84 is arranged in the hot water recovery tank 82, and the other end of the water outlet pipe 84 is connected to the first water outlet channel 672; a water inlet hole and a water outlet hole are provided on the mounting seat 63; a second water inlet channel 651 and a second water outlet channel 652 are provided on the outer jacket 65; the water inlet hole is connected to the first water inlet channel 671 and the second water inlet channel 651, and the water outlet hole is connected to the first water outlet channel 672 and the second water outlet channel 652.

[0059] For example, a flow channel baffle 4 is disposed between the mounting base 63 and the cooling head 67. The baffle 4 has a through hole, within which an on / off valve is located. The baffle 4 also has an electromagnetic relay configured to open or close the on / off valve. The baffle 4 is fixedly connected to the cooling head 67 and abuts the mounting base 63. During the tensile test, the on / off valve is closed, halting cooling of the outer jacket 65.

[0060] Illustratively, a cooler is provided between the water inlet tank 81 and the hot water recovery tank 82 , and the hot water in the hot water recovery tank 82 can be fed into the water inlet tank 81 for reuse after being cooled by the cooler.

[0061] For example, when the temperature in the high-temperature housing 5 reaches the set temperature, the electromagnetic relay controls the on-off valve to open, and the cooling water in the water inlet tank 81 flows through the cooling head 67 and the water inlet hole into the second water inlet channel 651, thereby cooling the clamping assembly in the high-temperature housing 5 and preventing excessive temperatures from affecting the mechanical properties of the clamping assembly. At this time, the second water outlet channel 652 and the first water outlet channel 672 are also in a connected state.

[0062] For example, in the embodiment of the present application, Figure 1-10As shown, the high-temperature box 5 includes a first shell 51, a second shell 52 and a sliding assembly 53; the sleeve 66 is connected to the first shell 51, and the outer jacket 65 is slidingly connected to the first shell 51; the second clamping assembly 7 is arranged on the second shell 52; the first shell 51 is slidingly connected to the second shell 52 through the sliding assembly 53.

[0063] Exemplarily, the sliding assembly 53 includes a screw 531, a screw pair 532 and a support 533; the support 533 is connected to the second shell 52, and the screw pair 532 is connected to the first shell 51; one end of the screw 531 is rotatably connected to the support 533, and the other end of the screw 531 is threadedly connected to the screw pair 532.

[0064] For example, during the sample clamping process, the workpiece can be preliminarily clamped conveniently by adjusting the distance between the first shell 51 and the second shell 52 .

[0065] An embodiment of the present invention provides a high-temperature tensile testing method for molybdenum and molybdenum alloy rods, using a high-temperature tensile testing device for molybdenum and molybdenum alloy rods, comprising the following steps:

[0066] Clamping the test workpiece: Increase the distance between the first clamping assembly 6 and the second clamping assembly 7, place the test workpiece between the first clamping assembly 6 and the second clamping assembly 7, first clamp the test workpiece with the first clamping assembly 6, and then reduce the distance between the first clamping assembly 6 and the second clamping assembly 7 until the test workpiece is clamped by the second clamping assembly 7;

[0067] Heating of the test workpiece: The high temperature box 5 is heated to the target temperature at 20°C / min and kept at this temperature for 15 minutes;

[0068] The test workpiece is loaded: stretched at a rate of 0.5 mm / min until fracture, and the data is recorded simultaneously;

[0069] Analysis of test results: Generate stress-strain curves and calculate high-temperature mechanical parameters.

[0070] In the embodiment of this application, Figure 1-10As shown, the first clamping assembly 6 also includes a sleeve 66, which is sleeved on the outside of the outer jacket 65 and connected to the high-temperature box 5, and the outer jacket 65 is slidably connected to the sleeve 66; the outer side of the elastic jacket 61 is provided with an outer conical surface 6121, and the inner side of the outer jacket 65 is provided with an inner conical surface 653, and the outer conical surface 6121 and the inner conical surface 653 are in contact with each other; when the first clamping assembly 6 clamps the test workpiece, the cam mechanism 62 is rotated to move the elastic jacket 61 in the direction close to the cooling head 67; in this process, the outer conical surface 6121 of the elastic jacket 61 and the inner conical surface 653 of the outer jacket 65 slide relative to each other, so that the elastic jacket 61 contracts in the direction of the test workpiece to preliminarily clamp the workpiece, and at the same time, the elastic jacket 61 is clamped with the cooling head 67 through the connecting shaft 64. After clamping, the elastic jacket 61 and the cooling head 67 are in contact. In the process of loading the test workpiece, the cooling head 67 is pulled by the crossbeam of the universal testing machine 1, and the cooling head 67 pulls the elastic jacket 61 through the connecting shaft 64; in the initial stage, the outer jacket 65 is in a stationary state due to the friction of the sleeve 66, and the elastic jacket 61 pulls the test workpiece toward the cooling head 67. There is friction between the elastic jacket 61 and the test workpiece. As the elastic jacket 61 moves toward the cooling head 67, the degree of squeezing of the test workpiece by the elastic jacket 61 increases continuously, thereby gradually increasing the clamping force of the elastic jacket 61 clamping the test workpiece until the limit surface 6111 of the elastic jacket 61 abuts the end face of the outer jacket 65; the crossbeam of the universal testing machine 1 continues to pull the cooling head 67, and at this time the elastic jacket 61 drives the outer jacket 65 to move toward the cooling head 67, thereby continuing the tensile test.

[0071] Illustratively, the present application achieves the technical effect of gradually increasing the clamping force of the clamping assembly through the stretching force during the stretching process, and can cool the clamping assembly in the high-temperature box 5, thereby improving the reliability and service life of the stretching detection equipment.

[0072] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0073] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A high temperature tensile testing equipment for molybdenum and molybdenum alloy rods, characterized in that: It comprises a universal testing machine (1), a high temperature box (5), a first clamping assembly (6) and a second clamping assembly (7); The high temperature box (5) is arranged between two crossbeams of the universal testing machine (1) and is connected to the universal testing machine (1); The first clamping assembly (6) comprises an elastic jacket (61), a cam mechanism (62), a connecting shaft (64), an outer jacket (65) and a cooling head (67); One end of the cooling head (67) is connected to one of the beams of the universal testing machine (1), and the other end is connected to the connecting shaft (64); The elastic jacket (61) is arranged inside the outer jacket (65), and one end of the elastic jacket (61) is detachably connected to the test workpiece, and the other end is connected to the cooling head (67) via the connecting shaft (64); The outer jacket (65) is slidably connected to the high-temperature box (5); One end of the cam mechanism (62) passes through the outer jacket (65) and is rotatably connected to the elastic jacket (61), and the cam mechanism (62) is configured to pull the elastic jacket (61) to move toward or away from the cooling head (67) during the rotation process; When the cam mechanism (62) pulls the elastic jacket (61) to move toward the cooling head (67), the elastic jacket (61) clamps the test workpiece; When the cam mechanism (62) pulls the elastic jacket (61) to move in a direction away from the cooling head (67), the elastic jacket (61) releases the test workpiece; The first clamping assembly (6) further includes a sleeve (66); The sleeve (66) is sleeved on the outside of the outer jacket (65) and connected to the high-temperature box (5), and the outer jacket (65) and the sleeve (66) are slidably connected; The cam mechanism (62) includes an eccentric wheel (621), a rotating shaft (622), and a shaft sleeve (623); The outer jacket (65) is provided with a mounting groove (624), and the rotating shaft (622) is arranged in the mounting groove (624); The shaft sleeve (623) is provided between the rotating shaft (622) and the mounting groove (624); The sleeve (66) is provided with an avoidance groove (661); One end of the rotating shaft (622) extends out of the avoidance groove (661), and the other end of the rotating shaft (622) is connected to the eccentric wheel (621), and the eccentric wheel (621) is rotatably connected to the elastic jacket (61); The cam mechanism (62) further includes a second elastic member (626) and a clamping member (627); A rotation groove (628) is provided on the shaft sleeve (623), the clamping member (627) is disposed in the rotation groove (628), and the clamping member (627) is slidably connected to the shaft sleeve (623); The second elastic member (626) is disposed in the mounting groove (624); One end of the second elastic member (626) is connected to the outer jacket (65), and the other end of the second elastic member (626) is connected to the clamping member (627); The first clamping assembly (6) and the second clamping assembly (7) are arranged relative to each other; One end of the second clamping assembly (7) is connected to the other beam, and the other end thereof is connected to the test workpiece.

2. The high temperature tensile testing equipment for molybdenum and molybdenum alloy rods according to claim 1, characterized in that: The first clamping assembly (6) further includes a mounting seat (63); The mounting seat (63) is further provided between the cooling head (67) and the outer jacket (65); One end of the cam mechanism (62) passes through the sleeve (66) and the outer jacket (65) in sequence and is rotatably connected to the elastic jacket (61); The elastic jacket (61) is provided with a mounting hole, and the test workpiece is arranged in the mounting hole; An outer conical surface (6121) is provided on the outer side of the elastic jacket (61), and an inner conical surface (653) is provided on the inner side of the outer jacket (65), and the outer conical surface (6121) and the inner conical surface (653) are in close contact with each other.

3. The high temperature tensile testing equipment for molybdenum and molybdenum alloy rods according to claim 2, characterized in that: The elastic jacket (61) includes a pull rod (611) and a plurality of clamping claws (612); The plurality of clamping jaws (612) are evenly distributed around the circumference, and the plurality of clamping jaws (612) are all connected to an end of the pull rod (611) away from the cooling head (67), and an end of the pull rod (611) close to the cooling head (67) is connected to the connecting shaft (64); The material of the clamping claw (612) is elastic material; When the outer conical surface (6121) and the inner conical surface (653) slide relative to each other, the clamping jaw (612) is deformed, and the clamping jaw (612) is configured to clamp or release the test workpiece.

4. The high temperature tensile testing equipment for molybdenum and molybdenum alloy rods according to claim 2, characterized in that: The elastic jacket (61) comprises a pull rod (611), a first elastic member (613), and a plurality of clamping claws (612); The plurality of clamping claws (612) are evenly distributed on the end surface of the pull rod (611); A slider (614) is provided on the clamping jaw (612), and a sliding groove (615) is provided at one end of the pull rod (611) close to the clamping jaw (612); The clamping claw (612) slides in the sliding groove (615) via the sliding block (614); A first elastic member (613) is provided in the sliding groove (615), one end of the first elastic member (613) abuts against the pull rod (611), and the other end of the first elastic member (613) is connected to the sliding block (614); When the cam mechanism (62) pulls the elastic jacket (61) to move in a direction away from the cooling head (67), the first elastic member (613) returns to a natural state; When the cam mechanism (62) pulls the elastic jacket (61) to move in a direction close to the cooling head (67), the first elastic member (613) is in a compressed state.

5. The high temperature tensile testing equipment for molybdenum and molybdenum alloy rods according to claim 1, characterized in that: Also included is a ball plunger (9); A ball plunger (9) is provided on one side of the connecting shaft (64) close to the cooling head (67); A snap-fit ​​groove (673) is provided on the cooling head (67), and the ball plunger (9) is configured to snap-fit ​​with the cooling head (67) through the snap-fit ​​groove (673); When the cam mechanism (62) pulls the elastic jacket (61) to move in a direction close to the cooling head (67), the ball plunger (9) moves into the engaging groove (673); When the cam mechanism (62) pulls the elastic jacket (61) to move in a direction away from the cooling head (67), the ball plunger (9) moves away from the clamping groove (673) toward the elastic jacket (61).

6. The high temperature tensile testing equipment for molybdenum and molybdenum alloy rods according to claim 2, characterized in that: It also includes a fixture cooling assembly (8), wherein the fixture cooling assembly (8) includes a water inlet tank (81), a hot water recovery tank (82), a water inlet pipe (83), and a water outlet pipe (84); The water inlet tank (81) contains cooling water; The cooling head (67) is provided with a first water inlet channel (671) and a first water outlet channel (672); The first water inlet channel (671) and the first water outlet channel (672) are in communication; One end of the water inlet pipe (83) is disposed in the water inlet box (81), and the other end of the water inlet pipe (83) is in communication with the first water inlet channel (671); One end of the water outlet pipe (84) is disposed in the hot water recovery tank (82), and the other end of the water outlet pipe (84) is in communication with the first water outlet channel (672); The mounting seat (63) is provided with a water inlet hole and a water outlet hole; The outer jacket (65) is provided with a second water inlet channel (651) and a second water outlet channel (652); The water inlet hole is connected to the first water inlet channel (671) and the second water inlet channel (651), and the water outlet hole is connected to the first water outlet channel (672) and the second water outlet channel (652).

7. A high temperature tensile testing method for molybdenum and molybdenum alloy rods, characterized in that: Using the high-temperature tensile testing equipment for molybdenum and molybdenum alloy rods according to any one of claims 1 to 6 comprises the following steps: Clamping the test workpiece: increasing the distance between the first clamping assembly (6) and the second clamping assembly (7), placing the test workpiece between the first clamping assembly (6) and the second clamping assembly (7), first clamping the test workpiece by the first clamping assembly (6), and reducing the distance between the first clamping assembly (6) and the second clamping assembly (7) until the test workpiece is clamped by the second clamping assembly (7); Heating of the test workpiece: The high temperature box (5) is heated to the target temperature at 20°C / min and kept at this temperature for 15 minutes; The test workpiece is loaded: stretched at a rate of 0.5 mm / min until fracture, and the data is recorded simultaneously; Analysis of test results: Generate stress-strain curves and calculate high-temperature mechanical parameters.

8. The high temperature tensile testing method for molybdenum and molybdenum alloy rods according to claim 7, characterized in that: The first clamping assembly (6) further includes a sleeve (66), the sleeve (66) being sleeved on the outside of the outer jacket (65) and connected to the high-temperature box (5), and the outer jacket (65) and the sleeve (66) being slidably connected; An outer conical surface (6121) is provided on the outer side of the elastic jacket (61), and an inner conical surface (653) is provided on the inner side of the outer jacket (65), wherein the outer conical surface (6121) and the inner conical surface (653) are in close contact with each other; When the first clamping assembly (6) clamps the test workpiece, the cam mechanism (62) is rotated to move the elastic jacket (61) toward the cooling head (67); during this process, the outer conical surface (6121) of the elastic jacket (61) and the inner conical surface (653) of the outer jacket (65) slide relative to each other, causing the elastic jacket (61) to shrink toward the test workpiece to preliminarily clamp the workpiece, and at the same time, the elastic jacket (61) is clamped to the cooling head (67) through the connecting shaft (64). After the clamping, the elastic jacket (61) and the cooling head (67) form a relatively fixed connection; During the loading process of the test workpiece, the cooling head (67) is pulled by the crossbeam of the universal testing machine (1), and the cooling head (67) pulls the elastic jacket (61) through the connecting shaft (64); the outer jacket (65) is slidably connected to the sleeve (66), and in the initial stage, the outer jacket (65) is subjected to the friction force of the sleeve (66) so that it is in a static state, and the elastic jacket (61) pulls the test workpiece to move in the direction of the cooling head (67). There is friction between the elastic jacket (61) and the test workpiece. As the elastic jacket (61) moves in the direction of the cooling head (67), the degree of compression of the test workpiece by the elastic jacket (61) increases continuously, so that the clamping force of the elastic jacket (61) clamping the test workpiece gradually increases until the limit surface (6111) of the elastic jacket (61) abuts against the end face of the outer jacket (65); The crossbeam of the universal testing machine (1) continues to pull the cooling head (67), and at this time the elastic jacket (61) drives the outer jacket (65) to move in the direction of the cooling head (67), thereby continuing the tensile test.

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