Force measuring clamp device for cryogenic loading machine

Abstract

The utility model belongs to the field of material testing, and particularly relates to a force measuring clamp device for a cryogenic loading machine, which comprises a test box and a test device, and the test device comprises a linear moving mechanism, a pull / press rod, a pressure sensor and a temperature protection mechanism. Mounting holes are formed in the box wall of the test box; the linear moving mechanism is arranged outside the test box, the output end of the linear moving mechanism is connected with the pulling / pressing rod, the pulling / pressing rod is arranged on the mounting hole in a sliding manner, and one end of the pulling / pressing rod extends into the test box through the mounting hole and is used for being connected with a material to be tested; the pressure sensor is arranged outside the test box; and the temperature protection mechanism is fixedly arranged on the outer side of the mounting hole outside the test box. The force measuring clamp device for the cryogenic loading machine provided by the utility model can be used for testing the tensile property or compressive property of a material to be tested in a low-temperature environment.

Description

Technical Field

[0001] The utility model belongs to the field of material testing, and in particular relates to a force measuring fixture device for a deep cold loading machine. Background Art

[0002] With the continuous development of my country's aerospace industry, many parts need to work at low temperatures, such as satellite parts, spacecraft parts, interstellar probe parts, etc. Therefore, the mechanical properties of various aerospace materials at low temperatures are one of the key considerations for the selection of mechanical parts materials.

[0003] At present, most materials are tested for low-temperature mechanical properties by applying force loads to the test specimens in a temperature chamber. However, at extremely low temperatures, almost all mechanical sensors cannot work properly, resulting in inaccurate force load measurements. Therefore, it is necessary to design a force measuring fixture device for a deep cold loading machine that can be used at extremely low temperatures. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a force measuring fixture device for a deep cold loading machine which has a simple and reliable structure and can ensure the test accuracy.

[0005] The utility model provides a force measuring fixture device for a deep cold loading machine, comprising a test box and a testing device, wherein the testing device comprises a linear moving mechanism, a pulling / pressing rod, a pressure sensor and a temperature protection mechanism;

[0006] The test box is used to fix the material to be tested and provide a low-temperature environment, and the wall of the test box is provided with mounting holes;

[0007] The linear motion mechanism is arranged outside the test box, and the output end of the linear motion mechanism is connected to the tension / compression rod, and is used to drive the tension / compression rod to move linearly. The tension / compression rod is slidably arranged on the mounting hole, and one end of the tension / compression rod extends into the test box through the mounting hole and is used to connect with the material to be tested;

[0008] The pressure sensor is arranged outside the test box and is used to detect the tension or pressure of the tension / compression rod;

[0009] The temperature protection mechanism is fixedly arranged outside the mounting hole outside the test box, and is used for heating the tension / compression rod at the mounting hole.

[0010] Furthermore, the temperature protection mechanism includes an annular mounting member, an electromagnetic coil disposed on the annular mounting member, and a power source connected to the electromagnetic coil;

[0011] The annular mounting piece is fixedly arranged at the mounting hole outside the test box, the tension / compression rod is clearance-matched with the annular mounting piece, and the electromagnetic coil is used for performing electromagnetic induction heating on the tension / compression rod at the mounting hole.

[0012] Furthermore, the pressure sensor is arranged between the output end of the linear motion mechanism and the pulling / pressing rod.

[0013] Furthermore, a movable test piece connection structure is provided at one end of the tension / compression rod located in the test box;

[0014] The inner wall of the test box opposite to the mounting hole is provided with a connecting structure for fixing the experimental piece.

[0015] Furthermore, the movable test piece connection structure is detachably connected to the tension / compression rod, and the fixed test piece connection structure is detachably connected to the inner wall of the test box.

[0016] Furthermore, the movable test piece connection structure is detachably connected to the material to be tested, and the fixed test piece connection structure is detachably connected to the material to be tested.

[0017] Furthermore, the mounting hole is arranged on the top of the test box, the linear motion mechanism is fixedly arranged on the top of the test box, and the tension / compression rod is arranged vertically.

[0018] Furthermore, the test box includes a box body and a box door, and the box body is provided with a liquid nitrogen interface for conveying liquid nitrogen into the box body.

[0019] Furthermore, the testing device is provided in multiple groups.

[0020] Furthermore, the linear motion mechanism comprises a threaded rod, a slider, an L-shaped connecting block, a polished rod and a bracket;

[0021] The bracket is fixed on the test box, the threaded rod is rotatably arranged on the bracket, the smooth rod is arranged on the bracket parallel to the threaded rod, and the slider is provided with a threaded hole matched with the threaded rod and a sliding hole slidably matched with the smooth rod;

[0022] The L-shaped connecting block is fixedly arranged on the sliding block and is used for fixing the tension / compression rod or the pressure sensor.

[0023] The beneficial effect of the utility model is that the force measuring fixture device for a cryogenic loader provided by the utility model can test the tensile properties or compressive properties of the test material in a low-temperature environment, can reduce the influence of the low-temperature environment on the pressure sensor, and make the pressure sensor within the normal operating temperature range, which better solves the problem of inaccurate force measurement of the cryogenic loader. In addition, the overall structure is simple and reliable, the service life is long, and it is safe and reliable during use, which can reduce safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Attached Figure 2 It is a structural schematic diagram of the testing device in the utility model;

[0026] Attached Figure 3 For attachment Figure 2 A partial enlarged view of the middle A;

[0027] Attached Figure 4 For attachment Figure 2 A partial enlarged view of point B in the middle.

[0028] In the figure, 1-linear moving mechanism; 11-threaded rod; 12-slider; 13-L-type connecting block; 14-plain rod; 15-bracket; 16-bolt; 2-pressure sensor; 3-tension / compression rod; 4-temperature protection mechanism; 5-movable test piece connection structure; 6-fixed test piece connection structure; 7-test chamber; 71-chamber body; 72-chamber door; 73-liquid nitrogen interface. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] As attached Figure 1 -Attached Figure 4 As shown, the utility model provides a force measuring fixture device for a cryogenic loading machine, which is used to test the mechanical properties of a material in a low temperature or extremely low temperature environment, specifically, the compressive properties or tensile properties, including a test box 7 and a test device, wherein the test device includes a linear moving mechanism 1, a tension / compression rod 3, a pressure sensor 2 and a temperature protection mechanism 4;

[0035] The test box 7 is used to fix the material to be tested and provide a low temperature environment, that is, the material to be tested is fixed in the test box 7, and the box has a low temperature (including extremely low temperature, such as minus 196°C and below) environment, and the compressive performance or tensile performance of the material to be tested in the low temperature environment is tested. The box wall of the test box 7 is provided with mounting holes;

[0036] The linear motion mechanism 1 is arranged outside the test box 7 to avoid the linear motion mechanism 1 being in a low temperature environment in the box, thereby ensuring the normal use of the linear motion mechanism 1. The output end of the linear motion mechanism 1 is connected to the pulling / compressing rod 3 to drive the pulling / compressing rod 3 to move linearly. The pulling / compressing rod 3 is slidably arranged on the mounting hole, and one end extends into the test box 7 through the mounting hole and is used to connect with the material to be tested. When the pulling / compressing rod 3 is connected to the material to be tested, the linear motion mechanism 1 is used to apply tension or pressure to the material to be tested through the pulling / compressing rod 3; specifically, when testing the low-temperature compressive performance of the material to be tested, the pulling / compressing rod 3 is used as a compression rod, and the linear motion mechanism 1 drives the pulling / compressing rod 3 to move toward the box to squeeze the material to be tested; when testing the low-temperature tensile performance of the material to be tested, the pulling / compressing rod 3 is used as a pulling rod, and the linear motion mechanism 1 drives the pulling / compressing rod 3 to move away from the box to pull the material to be tested;

[0037] The pressure sensor 2 is arranged outside the test box 7, and is used to detect the tension or pressure of the tension / compression rod 3, so as to avoid the pressure sensor 2 being in a low temperature environment in the box, thereby ensuring the normal use of the pressure sensor 2 and ensuring the measurement accuracy of the tension or pressure;

[0038] The temperature protection mechanism 4 is fixedly arranged on the outside of the mounting hole outside the test box 7, and is used to heat the pull / compression rod 3 at the mounting hole to prevent the low temperature environment in the test box 7 from being transmitted to the pressure sensor 2 or the linear motion mechanism 1 through the pull / compression rod 3, thereby ensuring the high stability of the use of the pressure sensor 2 or the linear motion mechanism 1 and improving the accurate force measurement requirement of the pressure sensor 2.

[0039] The force measuring fixture device for a cryogenic loader provided by the utility model can test the tensile properties or compressive properties of a test material in a low-temperature environment, and can reduce the influence of the low-temperature environment on the pressure sensor 2, so that the pressure sensor 2 can be within the normal operating temperature range, thereby better solving the problem of inaccurate force measurement of a cryogenic loader. In addition, the overall structure is simple and reliable, the service life is long, and it is safe and reliable during use, which can reduce safety hazards.

[0040] In one embodiment, the temperature protection mechanism 4 includes an annular mounting member, an electromagnetic coil disposed on the annular mounting member, and a power source connected to the electromagnetic coil;

[0041] The annular mounting part is fixedly arranged at the mounting hole outside the test box 7, the tension / compression rod 3 is gap-matched with the annular mounting part, and the electromagnetic coil is used to perform electromagnetic induction heating on the tension / compression rod 3 at the mounting hole. In this embodiment, electromagnetic induction heating is used to heat the part of the tension / compression rod 3, which has the characteristics of fast heating speed and can prevent the low temperature from being transmitted to the pressure sensor 2 through the tension / compression rod 3. In addition, the gap of the annular mounting part is matched with the gap of the tension / compression rod 3, which can also reduce the loss of low temperature inside the test box 7 through the mounting hole and reduce energy.

[0042] In one embodiment, the pressure sensor 2 is arranged between the output end of the linear motion mechanism 1 and the tension / compression rod 3. Preferably, the pressure sensor 2 is a pressure transmitter, and a stress strain detection device is externally connected to the pressure transmitter to test the tension and pressure. Figure 3 One end of the pressure transmitter is connected to the output end of the linear motion mechanism 1 through a bolt 16, and the other end is threadedly connected to the tension / compression rod 3, which simplifies the installation difficulty of the pressure transmitter.

[0043] In one embodiment, a movable test piece connection structure 5 is provided at one end of the tension / compression rod 3 located in the test box 7, and the movable test piece connection structure 5 is used to connect the material to be tested and drive the material to be tested to move, thereby achieving tension and compression of the material to be tested;

[0044] The inner wall of the test box 7 opposite to the mounting hole is provided with a fixed test piece connection structure 6 for fixing the other end of the material to be tested, and the end of the material to be tested connected to the fixed test piece connection structure 6 is always fixed. Specifically, when conducting a tensile performance test, the mobile test piece connection structure 5 and the fixed test piece connection structure 6 are respectively fixedly connected to the two ends of the material to be tested, and the fixed connection method can be conventional fixing methods such as threading and clamping. When conducting a compressive performance test, the mobile test piece connection structure 5 and the fixed test piece connection structure 6 can be respectively abutted against the two ends of the material to be tested. Preferably, the end faces of the mobile test piece connection structure 5 and the fixed test piece connection structure 6 are provided with an interlocking groove, and the two ends of the material to be tested are embedded in the interlocking groove to improve the stability of the abutment fit and avoid lateral displacement of the material to be tested relative to the mobile test piece connection structure 5 and the fixed test piece connection structure 6 during the pressure performance test.

[0045] In one embodiment, the mobile test piece connection structure 5 is detachably connected to the tension / compression rod 3, and the fixed test piece connection structure 6 is detachably connected to the inner wall of the test box 7, thereby facilitating the replacement of the mobile test piece connection structure 5 and the fixed test piece connection structure 6, and facilitating the replacement of different types of mobile test piece connection structures 5 and fixed test piece connection structures 6 to test materials to be tested with different structures.

[0046] In one embodiment, the movable test piece connection structure 5 is detachably connected to the material to be tested, and the fixed test piece connection structure 6 is detachably connected to the material to be tested, thereby facilitating the fixing and separation of the movable test piece connection structure 5 and the fixed test piece connection structure 6 from the material to be tested.

[0047] In one of the embodiments, the mounting hole is arranged on the top of the test box 7, the linear moving mechanism 1 is fixedly arranged on the top of the test box 7, and the pull / compression rod 3 is arranged vertically. In this embodiment, the pull / compression rod 3 is arranged vertically to avoid other component forces generated by the weight of the pull / compression rod 3 affecting the test accuracy, and the linear moving mechanism 1 is fixedly arranged on the top of the test box 7 to simplify the installation difficulty.

[0048] In one embodiment, the test box 7 includes a box body 71 and a box door 72. The box door 72 is preferably a sealed box door to provide a good sealing effect. By providing the box door 72, the disassembly and assembly of the material to be tested in the box body 71 can be simplified. The box body 71 is provided with a liquid nitrogen interface 73 for conveying liquid nitrogen into the box body 71, that is, by conveying liquid nitrogen into the box body 71, the temperature in the box body 71 is kept at a low temperature.

[0049] In one embodiment, the testing device is provided with multiple groups, so that multiple materials to be tested can be tested at one time, multiple tensile and compressive tests can be performed on the same material, and the same or different tensile and compressive tests can be performed on multiple different materials, thereby improving the testing efficiency.

[0050] In one preferred embodiment, the linear motion mechanism 1 includes a threaded rod 11, a slider 12, an L-shaped connecting block 13, a polished rod 14 and a bracket 15;

[0051] The bracket 15 is fixed on the test box 7, the threaded rod 11 is rotatably arranged on the bracket 15, the smooth rod 14 is arranged on the bracket 15 parallel to the threaded rod 11, and the slider 12 is provided with a threaded hole matched with the threaded rod 11 and a sliding hole slidably matched with the smooth rod 14;

[0052] The L-shaped connecting block 13 is fixedly arranged on the slider 12 and is used to fix the pull / compression rod 3 or the pressure sensor 2. One side of the L-shaped connecting block 13 is fixedly connected to the slider 12, and the other side is used to fix the pull / compression rod 3, so that the moving direction of the pull / compression rod 3 can be parallel to the moving direction of the slider 12.

[0053] In this embodiment, the threaded fit between the slider 12 and the threaded rod 11 has a self-locking capability, so after adjusting the tension or pressure applied to the material to be tested, it can be fixed, thereby performing a long-term tension or pressure test. Preferably, a rotating handle is provided at the end of the threaded rod 11, thereby enabling manual adjustment.

[0054] The above is only an embodiment and does not limit the present invention in any way. Any person skilled in the art can make many possible changes, modifications or modifications to the present invention without departing from the scope of the present invention by using the above disclosed technical contents. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the present invention should fall within the scope of protection of the present invention.

Claims

1. A force measuring fixture device for a cryogenic loading machine, characterized in that: It comprises a test box (7) and a test device, wherein the test device comprises a linear moving mechanism (1), a tension / compression rod (3), a pressure sensor (2) and a temperature protection mechanism (4); The test box (7) is used to fix the material to be tested and provide a low-temperature environment, and the wall of the test box (7) is provided with mounting holes; The linear motion mechanism (1) is arranged outside the test box (7), the output end of the linear motion mechanism (1) is connected to the tension / compression rod (3) and is used to drive the tension / compression rod (3) to move linearly, the tension / compression rod (3) is slidably arranged on the mounting hole, and one end of the tension / compression rod (3) extends into the test box (7) through the mounting hole and is used to connect with the material to be tested; The pressure sensor (2) is arranged outside the test box (7) and is used to detect the tension or pressure of the tension / compression rod (3); The temperature protection mechanism (4) is fixedly arranged outside the mounting hole outside the test box (7) and is used to heat the tension / compression rod (3) at the mounting hole.

2. The force measuring fixture device for a cryogenic loading machine as claimed in claim 1, characterized in that: The temperature protection mechanism (4) comprises an annular mounting member, an electromagnetic coil arranged on the annular mounting member, and a power source connected to the electromagnetic coil; The annular mounting piece is fixedly arranged at a mounting hole outside the test box (7), the tension / compression rod (3) is clearance-matched with the annular mounting piece, and the electromagnetic coil is used to perform electromagnetic induction heating on the tension / compression rod (3) at the mounting hole.

3. The force measuring fixture device for a cryogenic loading machine as claimed in claim 1, characterized in that: The pressure sensor (2) is arranged between the output end of the linear motion mechanism (1) and the pulling / pressing rod (3).

4. The force measuring fixture device for a cryogenic loading machine as claimed in claim 1, characterized in that: A movable test piece connection structure (5) is provided at one end of the tension / compression rod (3) located inside the test box (7); The inner wall of the test box (7) opposite to the mounting hole is provided with a connecting structure (6) for fixing the experimental piece.

5. The force measuring fixture device for a cryogenic loading machine as claimed in claim 4, characterized in that: The movable test piece connection structure (5) is detachably connected to the tension / compression rod (3), and the fixed test piece connection structure (6) is detachably connected to the inner wall of the test box (7).

6. The force measuring fixture device for a cryogenic loading machine as claimed in claim 5, characterized in that: The movable test piece connection structure (5) is detachably connected to the material to be tested, and the fixed test piece connection structure (6) is detachably connected to the material to be tested.

7. The force measuring fixture device for a cryogenic loading machine as claimed in claim 1, characterized in that: The mounting hole is arranged on the top of the test box (7), the linear moving mechanism (1) is fixedly arranged on the top of the test box (7), and the tension / compression rod (3) is arranged vertically.

8. The force measuring fixture device for a cryogenic loader according to any one of claims 1 to 7, characterized in that: The test box (7) comprises a box body (71) and a box door (72); the box body (71) is provided with a liquid nitrogen interface (73) for conveying liquid nitrogen into the box body (71).

9. The force measuring fixture device for a cryogenic loading machine as claimed in claim 8, characterized in that: The testing device is provided in multiple groups.

10. The force measuring fixture device for a cryogenic loading machine according to any one of claims 1 to 7, characterized in that: The linear motion mechanism (1) comprises a threaded rod (11), a sliding block (12), an L-shaped connecting block (13), a polished rod (14) and a bracket (15); The bracket (15) is fixed on the test box (7), the threaded rod (11) is rotatably arranged on the bracket (15), the smooth rod (14) is arranged on the bracket (15) parallel to the threaded rod (11), and the slider (12) is provided with a threaded hole matched with the threaded rod (11) and a sliding hole slidably matched with the smooth rod (14); The L-shaped connection block (13) is fixedly arranged on the sliding block (12) and is used to fix the tension / compression rod (3) or the pressure sensor (2).

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