Non-full-scale extensometer for stretching in low-temperature environment

Abstract

The utility model provides a non-full-scale extensometer for stretching in a low-temperature environment, and relates to the technical field of extensometers. The device comprises a clamping assembly, a measuring assembly and a sensor, the measuring assembly comprises a fixing frame, a measuring arm guide plate and a hanging bracket, the sensor is installed in the fixing frame, one end of the measuring arm guide plate is fixedly connected with the sensor, the hanging bracket is installed on the outer side of the fixing frame, and the top of the hanging bracket is provided with a hanging rope. The measuring assembly and the sensor can be integrally lifted in and out of the low-temperature environment box through the lifting rope and the lifting frame, the clamping assembly is used for clamping a to-be-tested sample, the bottom end of the clamping assembly is detachably connected with the measuring assembly and enables the measuring arm guide plate to be in contact with the to-be-tested sample, and the top end of the clamping assembly extends out of the top of the low-temperature environment box. By arranging the hanging bracket and the hanging rope, the extensometer can be hung in and out of the low-temperature environment box, so that the non-full-scale extensometer can be removed at any time in the low-temperature test process, and the extensometer is prevented from being damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to extensometer technical field especially to a non full scale extensometer for drawing under low temperature environment. BACKGROUND

[0002] With the further promotion of the new round of scientific and technological revolution and industrial reform, green low carbon, digitization and sustainable development have become the theme of the times. Many key knowledge innovation engineering fields are related to low temperature liquid application, which undoubtedly promotes the wide application and development of low temperature pressure-bearing equipment as a carrying tool.

[0003] Obtaining the mechanical properties of materials under low temperature environment, especially the yield strength and stress-strain curve of materials, is an important basis and basis for designing, manufacturing and maintaining low temperature pressure-bearing equipment. Low temperature extensometer is a necessary tool for accurately obtaining these relevant data.

[0004] Low temperature extensometer is used to measure the deformation of the parallel length of the tensile specimen in the extensometer gauge during tensile test under low temperature environment. According to the range, there are usually two kinds of full range low temperature extensometer and non full range low temperature extensometer. Because the full range low temperature extensometer can measure 100% deformation, it can not be removed during the whole low temperature tensile test, and it is also the most widely used extensometer in the current low temperature tensile test. The non full range low temperature extensometer must be removed during the tensile test because its range is small, otherwise it may exceed the range of the extensometer itself and cause damage to the extensometer when the specimen breaks. Because the non full range low temperature extensometer is immersed in low temperature liquid or environmental box during low temperature tensile test, it cannot be removed during the test, therefore, the non full range extensometer cannot be applied to low temperature tensile test at present.

[0005] In view of the above reasons, the utility model provides a non full range extensometer for drawing under low temperature environment to solve the problem that the non full range extensometer cannot be removed in low temperature test. Utility model content

[0006] The utility model aims at providing a non full range extensometer for drawing under low temperature environment, which can solve the problem that the non full range extensometer cannot be removed in low temperature test.

[0007] The utility model provides a kind of non full-range extensometer for stretching under low temperature environment, comprising: clamping assembly, measuring assembly and sensor, the measuring assembly includes fixed frame, measuring arm guide plate and hanger, the sensor is installed in the fixed frame, one end of the measuring arm guide plate is fixedly connected with the sensor, the hanger is installed on the outside of the fixed frame, the top of the hanger is provided with a sling, the measuring assembly and the sensor can be integrated into and taken out of low temperature environment box by the sling and the hanger, the clamping assembly is used to clamp test sample, the bottom end of the clamping assembly is detachably connected with the measuring assembly and makes the measuring arm guide plate contact with test sample, and the top end of the clamping assembly is stretched out from the top of the low temperature environment box.

[0008] Preferably, the fixed frame is U-shaped, one end of the sensor is stretched out from the opening thereof and is fixedly connected with the measuring arm guide plate.

[0009] Preferably, the number of the measuring arm guide plates is two, and they are symmetrically arranged in a stepped shape, one end of the sensor is clamped between the two measuring arm guide plates and is fixed by a fixed screw penetrating through the measuring arm guide plates.

[0010] Preferably, the hanger is a triangular hanger, both sides of which are two identical triangular rods, the top ends of the two triangular rods are fixedly connected by a top rod, and both sides of the fixed frame are respectively provided with two hanger points connected with the bottom ends of the triangular rods.

[0011] Preferably, the sling is fixedly connected with the middle part of the top rod.

[0012] Preferably, the clamping assembly is two L-shaped linear springs, the bottom parts of the L-shaped linear springs are bent into clamping parts, and the test sample is clamped inside the clamping parts.

[0013] Preferably, the top and bottom parts of the side of the measuring arm guide plate away from the sensor are respectively provided with fixing pieces, and the fixing pieces are fixed with the measuring arm guide plate by a positioning pin and a fixed nut.

[0014] Preferably, a positioning hole is formed in the fixing piece, and the end of the bottom part of the L-shaped linear spring after bending is inserted into the positioning hole.

[0015] Preferably, a screw hole communicating with the positioning hole is formed in the side surface of the fixing piece, and a fastening screw is inserted into the positioning hole through the screw hole to lock the end of the L-shaped linear spring.

[0016] Preferably, the top end of the L-shaped linear spring is bent to form a hook.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. By setting the hanger and the lifting rope, the fixed frame, the sensor arranged in the fixed frame and the measuring arm guide plate fixed with the sensor can be hoisted into and hoisted out of the low-temperature environment box, so that the non-full-range extensometer can be removed at any time during the low-temperature test, and the extensometer is prevented from being damaged;

[0019] 2. During the tensile test, the sample to be tested can be clamped on the measuring arm guide plate by the clamping assembly and the measuring assembly, and then the deformation amount of the sample is measured by the sensor fixed with the measuring arm guide plate, the sensor can convert the deformation amount of the measuring arm guide plate into an electrical signal input into a computer to obtain relevant data. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Fig. 1 It is a schematic diagram of the overall structure of the extensometer of the present application.

[0022] Fig. 2 It is an enlarged view of the local structure of the present application.

[0023] Fig. 3 It is a schematic diagram of the test process of the extensometer for testing the deformation amount of the sample to be tested.

[0024] Explanation of reference signs:

[0025] 1: fixed frame; 2: sensor; 3: hanger; 4: sample to be tested; 5: L-shaped linear spring; 6: fixed sheet; 7: fixed nut; 8: measuring arm guide plate; 9: locking screw; 10: low-temperature environment box; 11: lifting rope. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be described below in conjunction with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] In the description of the utility model, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0028] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, "a plurality of" means two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] As shown in Figs. 1-3 The utility model provides a kind of non full scale extensometer for stretching in low temperature environment, including: clamping component, measuring component and sensor 2, wherein, measuring component includes fixed frame 1, measuring arm guide plate 8 and hanger 3, sensor 2 is installed in fixed frame 1, one end of measuring arm guide plate 8 is fixedly connected with sensor 2, hanger 3 is installed on the outside of fixed frame 1, the top of hanger 3 is provided with lifting rope 11, measuring component and sensor 2 can be integrally hoisted into and hoisted out of low temperature environment box 10 by lifting rope 11 and hanger 3, low temperature environment box 10 can be filled with by testing low temperature liquid or other low temperature medium, clamping component is used to clamp test sample 4, the bottom end of clamping component is detachably connected with measuring component and makes measuring arm guide plate 8 contact with test sample 4, the deformation of test sample can be transmitted by measuring arm guide plate, and is collected by sensor 2, sensor 2 can convert the deformation of measuring arm into electrical signal input computer, to obtain relevant data, the top end of clamping component is stretched out from the top of low temperature environment box 10, can cooperate with lifting rope 11 and hanger 3 to take out extensometer as a whole, avoid non full scale extensometer in low temperature test process.

[0030] In the embodiment, the fixed frame 1 is U-shaped, one end of the sensor 2 extends out of the opening thereof and is fixedly connected with the measuring arm guide plate 8. The hanger 3 is a triangular hanger, two sides of the triangular hanger are two identical triangular rod members, top ends of the two triangular rod members are fixedly connected through a top rod, two lifting points connected with bottom ends of the triangular rod members are arranged on two sides of the fixed frame 1 respectively, the lifting points are arranged as pin shafts, the bottom ends of the triangular rod members are bent into two rings and are installed in cooperation with the pin shafts. The lifting rope 11 is fixedly connected with the middle part of the top rod, so that the extensometer can be stably lifted through the lifting rope 11.

[0031] In the embodiment, the number of the measuring arm guide plates 8 is two, the two measuring arm guide plates 8 are both stepped and symmetrically arranged, so that one end of the two measuring arm guide plates 8 is close to each other and the other end of the two measuring arm guide plates 8 has a square slot, one end of the sensor 2 is clamped in the square slot between the two measuring arm guide plates 8 and is fixed through a fixing screw passing through the measuring arm guide plate 8.

[0032] Specifically, the clamping assembly is two L-shaped linear springs 5, the bottom of the L-shaped linear spring 5 is bent into a clamping portion, the clamping portion is annular and can clamp the test sample after the tensile test inside. The top and the bottom of the side, away from the sensor 2, of the two measuring arm guide plates 8 are respectively provided with positioning pins, the fixing sheet 6 is provided with mounting holes corresponding, the positioning pins on the measuring arm guide plate 8 pass through the mounting holes on the fixing sheet 6 and are fixed through the fixing nuts 7.

[0033] In the embodiment, the edge of the fixing sheet 6 can abut against the outer periphery of the test sample 4, the position of the test sample 4 is fixed in cooperation with the L-shaped linear spring 5 and the measuring arm guide plate 8, the fixing sheet 6 is provided with a positioning hole, the axis of the positioning hole is perpendicular to the axis of the test sample 4, and the bottom of the L-shaped linear spring 5 is bent and the tail end thereof extends into the positioning hole. The side surface of the fixing sheet 6 is provided with a screw hole in communication with the positioning hole, the fastening screw 9 extends into the positioning hole through the screw hole and locks the tail end of the L-shaped linear spring 5, so that the position of the test sample 4 is fixed.

[0034] In the embodiment, the top end of the L-shaped linear spring 5 is bent to form a hook, so that the extensometer and the test sample 4 can be conveniently hung or lifted, and the low-temperature tensile test is facilitated.

[0035] The working process of the utility model is as follows:

[0036] Before the test, the fixed piece 6 is placed on the positioning pin at the front end of the measuring arm guide plate 8 and is fastened with the fixed nut 7; then the L-shaped linear spring 5 is clamped outside the sample 4 to be tested and the end thereof is passed through the positioning hole in the measuring arm guide plate 8 and is locked with the fastening screw 9; subsequently the extensometer is clamped on the gauge section of the sample 4 to be tested, so that the other end of the L-shaped linear spring 5 is higher than the liquid level or extends outside the low-temperature environment box 10; when the tensile test reaches the set deformation amount (at this time, the deformation amount should be less than the range of the extensometer itself), the extensometer is removed by using the part of the L-shaped linear spring 5 which is higher than the liquid level and the hanging rope 11, and the tensile test is continuously carried out until the test is finished.

[0037] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A non-full-range extensometer for use in tension in cryogenic environments, characterized in that, The utility model relates to a low temperature environment test device, including: a clamping assembly, a measuring assembly and a sensor, the measuring assembly includes a fixed frame, a measuring arm guide plate and a hanger, the sensor is installed in the fixed frame, one end of the measuring arm guide plate is fixedly connected with the sensor, the hanger is installed on the outside of the fixed frame, the top of the hanger is provided with a lifting rope, the measuring assembly and the sensor can be lifted into and lifted out of the low temperature environment box through the lifting rope and the hanger, the clamping assembly is used for clamping the sample to be tested, the bottom end of the clamping assembly is detachably connected with the measuring assembly and makes the measuring arm guide plate contact with the sample to be tested, and the top end of the clamping assembly is stretched out from the top of the low temperature environment box. The fixed frame is U-shaped, one end of the sensor is stretched out from the opening thereof and is fixedly connected with the measuring arm guide plate.

2. The non-full-range extensometer for stretching in a cryogenic environment according to claim 1, characterized in that, The number of the measuring arm guide plate is two, and the two are symmetrically arranged in a stepped shape, one end of the sensor is clamped between the two measuring arm guide plates and is fixed through a fixing screw penetrating the measuring arm guide plate.

3. The non-full-range extensometer for stretching in a cryogenic environment according to claim 2, characterized in that, The hanger is a triangular hanger, both sides of the triangular hanger are two identical triangular rod members, the top ends of the two triangular rod members are fixedly connected through a top rod, and the two sides of the fixed frame are respectively provided with two lifting points connected with the bottom ends of the triangular rod members.

4. The non-full-range extensometer for stretching in a cryogenic environment of claim 2, wherein, The lifting rope is fixedly connected with the middle part of the top rod.

5. The non-full-range extensometer for stretching in cryogenic environments according to claim 4, characterized in that, The clamping assembly is two L-shaped linear springs, the bottom of the L-shaped linear spring is bent into a clamping portion, and the sample to be tested is clamped in the inner side of the clamping portion.

6. The non-gage length extensometer for use in cryogenic environments of claim 1, wherein, The top and the bottom of the side, away from the sensor, of the measuring arm guide plate are respectively provided with fixing pieces, and the fixing pieces are fixed with the measuring arm guide plate through a positioning pin and a fixing nut.

7. The non-full-range extensometer for stretching in cryogenic environments according to claim 6, characterized in that, The fixing piece is provided with a positioning hole, and the bottom of the L-shaped linear spring is bent, and the tail end of the L-shaped linear spring is inserted into the positioning hole.

8. The non-full-range extensometer for stretching in cryogenic environments according to claim 7, characterized in that, The side surface of the fixing piece is provided with a screw hole in communication with the positioning hole, and a fastening screw is inserted into the positioning hole through the screw hole to lock the tail end of the L-shaped linear spring.

9. The non-gage length extensometer for use in cryogenic environments of claim 8, wherein, The top end of the L-shaped linear spring is bent to form a hook.

10. The non-full-range extensometer for stretching in cryogenic environments according to claim 6, characterized in that, ​

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