Auxiliary device for low-temperature tensile test of metal material

Abstract

The utility model discloses an auxiliary device for a low-temperature tensile test of a metal material, which relates to the field of low-temperature tensile of metal and particularly comprises a lower box body, an upper box body, a plurality of pressing pieces and two clamp components with opposite open ends, a cylindrical connecting rod at the top end of the upper clamp assembly penetrates through the cylindrical channel and is in clearance fit with the cylindrical channel. The pressing piece comprises a hook fixedly connected to the outer wall of the upper box body, a base fixedly connected to the outer wall of the lower box body, a handle rotationally connected to the base, a rotating shaft vertically penetrating through the handle and an n-shaped buckling frame connected with the rotating shaft, and the base is located under the hook; the n-shaped buckling frame of the pressing piece rotates into the bent hook on the upper portion along with rotation of the handle, the closed end of the n-shaped buckling frame can be tightly buckled with the bent hook by pressing the handle, the lower box body and the upper box body are tightly connected, and good sealing performance is achieved.

Description

Technical Field

[0001] The utility model relates to the field of low-temperature tension of metals, and particularly relates to an auxiliary device for low-temperature tension test of metal materials. Background Art

[0002] A tension test refers to a test method for determining the properties of a material under an axial tensile load. The data obtained from the tension test can be used to determine the elastic limit, elongation, elastic modulus, proportional limit, reduction of area, tensile strength, yield point, yield strength, and other tensile property indexes of the material. The reliability of the test results is extremely important for both users and the quality management and control of manufacturers.

[0003] In the tension test, sometimes it is necessary to conduct a low-temperature tension test on metal materials to detect the tensile property indexes of metal materials in a low-temperature environment. The conventional method is to contain low-temperature liquid in a container so that the metal material can be continuously maintained in the low-temperature liquid during the tension test, and the tension fixture moves relative to the container to tension the metal material and ensure the normal progress of the test.

[0004] However, for the above-mentioned conventional heat preservation measures, only the outer wrapping of the container cover with heat preservation cotton is relied on, while the sealing of the entire container is ignored, resulting in poor heat preservation effect. Summary of the Utility Model

[0005] The utility model provides an auxiliary device for low-temperature tension test of metal materials to solve the problem of poor sealing of the container used for low-temperature tension test.

[0006] The auxiliary device for low-temperature tension test of metal materials of the utility model adopts the following technical scheme: the device includes: a lower box body body, an upper box body body, a plurality of pressing members for sealingly connecting the lower box body body and the upper box body body, a fixture assembly fixedly connected inside the lower box body body, and a fixture assembly movably connected inside the upper box body body, and the open ends of the two fixture assemblies are arranged opposite to each other;

[0007] The top end of the fixture assembly connected to the upper box body body is fixedly connected with a cylindrical connecting rod. The top of the upper box body body is an integrally formed cylindrical channel, and the cylindrical channel extends outward and is communicated with the inside of the upper box body body. The cylindrical connecting rod passes through the cylindrical channel and has a clearance fit with the cylindrical channel; a plurality of piston rings are sleeved on the cylindrical connecting rod located in the cylindrical channel, and the circumferential outer wall of the piston ring is closely attached to the inner wall of the cylindrical channel;

[0008] The pressing member includes a hook fixedly connected to the outer wall of the upper box body, a base fixedly connected to the outer wall of the lower box body, a handle rotatably connected to the base, a rotating shaft vertically passing through the handle, and an n-shaped fastening frame connected to the rotating shaft; the base is located directly below the hook, through holes are radially formed at both ends of the rotating shaft, both ends of the opening of the n-shaped fastening frame are respectively inserted into the two through holes, external threads are provided at positions of the n-shaped fastening frame near both ends, nuts are connected to both ends of the n-shaped fastening frame in a matching manner, and the nuts connect the n-shaped fastening frame to the rotating shaft.

[0009] Preferably, a connecting portion for connecting a stretching machine is provided on the outer bottom wall of the lower box body; the connecting portion includes a connecting plate and two connecting columns slidably connected to the bottom of the connecting plate; a T-shaped sliding groove is formed at the bottom of the connecting plate, and a T-shaped protrusion adapted to be connected to the T-shaped sliding groove is provided at the top of the connecting column; a pin shaft hole for installing the stretching machine is formed on the connecting column.

[0010] Preferably, an annular groove is formed on the outer wall of the cylindrical connecting rod at the position where the piston ring is located, and a part of the inner wall of the piston ring is embedded in the annular groove.

[0011] Preferably, one end face of the piston ring is a plane, a V-shaped groove is provided on the other end face, and an annular groove for storing lubricating grease is formed on the outer side wall of the piston ring.

[0012] Preferably, the cylindrical connecting rod extends to the outside of the cylindrical channel.

[0013] Preferably, the outer walls of the lower box body and the upper box body are covered with heat-insulating cotton.

[0014] Preferably, the upper end face of the lower box body is covered with a rubber pad, and the lower end face of the upper box body is covered with a rubber pad.

[0015] Preferably, the upper and lower two fixture assemblies are coaxial. The fixture assembly includes two symmetrically arranged clamping arms, and a plurality of lead screws are vertically passed through the clamping arms. A stretching clamp block is rotatably connected to the ends of the plurality of lead screws near the other clamping arm. The two stretching clamp blocks are arranged in parallel. The lead screws are threadedly connected to the clamping arms. A T-shaped groove penetrating through the front and back is formed on the inner side face of the stretching clamp block, and a protective soft pad with a T-shaped protrusion is clamped and installed inside the T-shaped groove.

[0016] Preferably, a handle is vertically connected to the end of the lead screw far from the other clamping arm.

[0017] Preferably, a conical protrusion is provided on one side of the protective soft pad close to the other protective soft pad, and the thickness of the protective soft pad is greater than 1 cm.

[0018] The beneficial effects of the present utility model compared with the prior art are:

[0019] 1. In the present utility model, the lower box body and the upper box body are hermetically connected by a plurality of pressing members. Specifically, during actual use, the n-shaped fastening frame of the pressing member rotates into the upper hook as the handle rotates, and pressing the handle can tightly fasten the closed end of the n-shaped fastening frame with the hook, so that the lower box body and the upper box body are tightly connected, achieving good sealing performance.

[0020] 2. In the present utility model, a plurality of pressing members are used to tightly connect the lower box body and the upper box body. When installing or disassembling the tensile test piece, only by rotating the handle can the closed end of the n-shaped fastening frame be loosened from the hook, which is convenient and fast.

[0021] 3. In the present utility model, a plurality of piston rings are sleeved on the cylindrical connecting rod located in the cylindrical channel, and the circumferential outer wall of the piston ring is in close fit with the inner wall of the cylindrical channel, so that the inner cavity of the container formed between the lower box body and the upper box body achieves good sealing performance, and at the same time, it does not affect the up and down movement of the fixture assembly in the upper box body driven by the cylindrical connecting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is the full sectional view of the present utility model;

[0024] Figure 2 is the structural schematic diagram of the fixture assembly of the present utility model;

[0025] Figure 3 is the cross-sectional view of the piston ring of the present utility model;

[0026] Figure 4 is the structural schematic diagram of the pressing member of the present utility model.

[0027] DESCRIPTION OF THE REFERENCE NUMERALS

[0028] 1. Lower box body; 2. Upper box body; 3. Pressing member; 4. Fixture assembly; 5. Cylindrical connecting rod; 6. Piston ring; 7. Connecting portion; 8. Thermal insulation cotton; 21. Cylindrical channel; 31. Hook; 32. N-shaped fastening frame; 33. Base; 34. Rotating shaft; 35. Handle; 41. Clamping arm; 42. Lead screw; 43. Tensile clamping block; 44. Protective soft pad; 45. Handle; 61. V-shaped groove; 62. Annular groove; 71. Connecting plate; 72. Connecting column; 711. T-shaped sliding groove; 721. T-shaped protrusion; 722. Pin hole. Detailed implementation mode

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0030] An embodiment of an auxiliary device for a low-temperature tensile test of a metal material of the present utility model is as follows Figures 1 to 4 As shown, the device includes: a lower box body main body 1, an upper box body main body 2, a plurality of pressing members 3 for sealingly connecting the lower box body main body 1 and the upper box body main body 2, a fixture assembly 4 fixedly connected inside the lower box body main body 1, and a fixture assembly 4 movably connected inside the upper box body main body 2. The open ends of the two fixture assemblies 4 are arranged opposite to each other.

[0031] The top end of the fixture assembly 4 connected to the upper box body main body 2 is fixedly connected with a cylindrical connecting rod 5. The top of the upper box body main body 2 is an integrally formed cylindrical channel 21. The cylindrical channel 21 extends outward and is communicated with the inside of the upper box body main body 2. The cylindrical connecting rod 5 passes through the cylindrical channel 21 and is in clearance fit with the cylindrical channel 21. A plurality of piston rings 6 are sleeved on the cylindrical connecting rod 5 located in the cylindrical channel 21, and the circumferential outer wall of the piston ring 6 is in close fit with the inner wall of the cylindrical channel 21.

[0032] The pressing member 3 includes a hook 31 fixedly connected to the outer wall of the upper box body main body 2, a base 33 fixedly connected to the outer wall of the lower box body main body 1, a handle 35 rotatably connected to the base 33, a rotating shaft 34 vertically passing through the handle 35, and an n-shaped buckling frame 32 connected to the rotating shaft 34. The base 33 is located directly below the hook 31. Through holes are radially opened at both ends of the rotating shaft 34. The two open ends of the n-shaped buckling frame 32 are respectively inserted into the two through holes. External threads are provided at positions near both ends of the n-shaped buckling frame 32. Nuts are connected to both ends of the n-shaped buckling frame 32, and the nuts connect the n-shaped buckling frame 32 to the rotating shaft 34.

[0033] In this embodiment, it should be noted that the lower box body main body 1 and the upper box body main body 2 are tightly connected, and the side walls of the lower box body main body 1 or the upper box body main body 2 are provided with inlets and outlets for condensed gas, so as to form a low-temperature box for the lower box body main body 1 and the upper box body main body 2.

[0034] In this embodiment, it should be noted that the bottom of the fixture assembly 4 located inside the lower box body main body 1 is fixed to the inner bottom wall of the lower box body main body 1.

[0035] In this embodiment, it should be noted that the n-shaped fastening frame 32 rotates into the hook 31 as the handle 35 rotates, and the closed end of the n-shaped fastening frame 32 is tightly fastened to the corresponding hook 31 by pressing the handle 35, thereby sealingly connecting the lower box body 1 and the upper box body 2.

[0036] In this embodiment, a connecting portion 7 for connecting a stretching machine is provided on the outer bottom wall of the lower box body 1; the connecting portion 7 includes a connecting plate 71 and two connecting columns 72 slidably connected to the bottom of the connecting plate 71; a T-shaped sliding groove 711 is formed at the bottom of the connecting plate 71, and a T-shaped protrusion 721 adapted to be connected to the T-shaped sliding groove 711 is provided at the top of the connecting column 72; a pin hole 722 for installing the stretching machine is formed on the connecting column 72.

[0037] In actual use of this embodiment, corresponding lugs with pins are provided on the stretching machine workbench. By sliding and adjusting the distance between the two connecting columns 72 to meet the pin distance on the stretching machine, and then inserting the pin on the stretching machine into the pin hole 722 on the connecting shaft 72, so that the stretching machine can apply a downward pulling force to the lower box body 1.

[0038] In this embodiment, an annular groove is formed on the outer wall of the cylindrical connecting rod 5 where the piston ring 6 is located, and a part of the inner wall of the piston ring 6 is embedded in the annular groove.

[0039] In this embodiment, it should be noted that the annular groove limits the piston ring 6 to prevent the piston ring 6 from moving relative to the cylindrical connecting rod 5 and affecting the sealing performance.

[0040] In this embodiment, one end face of the piston ring 6 is a plane, and a V-shaped groove 61 is provided on the other end face. An annular groove 62 for storing grease is formed on the outer side wall of the piston ring 6.

[0041] In this embodiment, it should be noted that the V-shaped groove 61 can enhance the radial compressive characteristics of the piston ring 6. The annular groove 62 can play a role in storing grease. After long-term use, it can also achieve a good lubrication effect, and greatly increase the airtightness between the piston ring and the inside of the low-temperature box, improve the performance of the piston, and at the same time facilitate the movement of the cylindrical connecting rod 5 relative to the cylindrical channel 21.

[0042] In this embodiment, the cylindrical connecting rod 5 extends to the outside of the cylindrical channel 21.

[0043] In this embodiment, the outer walls of the lower box body 1 and the upper box body 2 are covered with heat-insulating cotton 8.

[0044] In this embodiment, the upper end face of the lower box body 1 is covered with a rubber pad, and the lower end face of the upper box body 2 is covered with a rubber pad.

[0045] In this embodiment, it should be noted that when multiple pressing members 3 are used to tightly connect the lower box body 1 and the upper box body 2, the presence of the rubber pad can improve the sealing performance at the connection between the lower box body 1 and the upper box body 2.

[0046] In this embodiment, the upper and lower fixture assemblies 4 are coaxial. The fixture assembly 4 includes two symmetrically arranged clamping arms 41. A plurality of lead screws 42 are vertically penetrated through the clamping arms 41. At the ends of the plurality of lead screws 42 close to the other clamping arm 41, a stretching clamp block 43 is rotatably connected. The two stretching clamp blocks 43 are arranged in parallel. The lead screws 42 are in threaded connection with the clamping arms 41. A T-shaped groove penetrating through the front and back is formed on the inner side surface of the stretching clamp block 43, and a protective soft pad 44 with a T-shaped protrusion is clamped and installed inside the T-shaped groove.

[0047] In this embodiment, it should be noted that the protective soft pad 44 and the stretching clamp block 43 are snap-fitted and fixed, which is convenient for replacement and disassembly. It can not only protect the clamping part of the tensile specimen during clamping, prevent damage to the tensile specimen with a lower density, leave clamping marks, and even cause the situation that the tensile specimen is broken halfway.

[0048] In this embodiment, a handle 45 is vertically connected to the end of the lead screw 42 away from the other clamping arm 41.

[0049] In this embodiment, it should be noted that the handle 45 can facilitate the manual screwing of the lead screw 42, increase the torque, and be more labor-saving.

[0050] In this embodiment, a conical protrusion is provided on one side of the protective soft pad 44 close to the other protective soft pad 44, and the thickness of the protective soft pad 44 is greater than 1 cm.

[0051] In this embodiment, it should be noted that the conical protrusion can increase the friction force between the surface of the tensile specimen during clamping, make the clamping more stable, facilitate use and operation, and the thickness of the protective soft pad 44 is relatively thick, and it can deform to a certain extent, thereby increasing the types of metals that the tensile fixture can clamp and improving the use efficiency.

[0052] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An auxiliary device for low temperature tensile testing of metal materials, characterized in that: The invention comprises a lower box body (1), an upper box body (2), a plurality of pressing members (3) sealingly connecting the lower box body (1) and the upper box body (2), a clamp assembly (4) fixedly connected to the interior of the lower box body (1), and a clamp assembly (4) movably connected to the interior of the upper box body (2), wherein the opening ends of the two clamp assemblies (4) are arranged opposite to each other; A cylindrical connecting rod (5) is fixedly connected to the top of the clamp assembly (4) connected to the upper box body (2); the top of the upper box body (2) is an integrally formed cylindrical channel (21); the cylindrical channel (21) is in an outwardly extending shape and is communicated with the interior of the upper box body (2); the cylindrical connecting rod (5) passes through the cylindrical channel (21) and is loosely matched with the cylindrical channel (21); a plurality of piston rings (6) are sleeved on the cylindrical connecting rod (5) located in the cylindrical channel (21); the circumferential outer wall of the piston ring (6) is tightly fitted with the inner wall of the cylindrical channel (21); The clamping member (3) comprises a hook (31) fixedly connected to the outer wall of the upper box body (2), a base (33) fixedly connected to the outer wall of the lower box body (1), a handle (35) rotatably connected to the base (33), a rotating shaft (34) vertically passing through the handle (35), and an n-shaped buckle frame (32) connected to the rotating shaft (34); the base (33) is located directly below the hook (31), both ends of the rotating shaft (34) are provided with through holes in the radial direction, the two ends of the opening of the n-shaped buckle frame (32) are respectively inserted into the two through holes, the n-shaped buckle frame (32) is provided with external threads near the two ends, and the two ends of the n-shaped buckle frame (32) are matched with nuts, and the nuts connect the n-shaped buckle frame (32) to the rotating shaft (34).

2. The auxiliary device for low temperature tensile test of metal materials according to claim 1, characterized in that: The outer bottom wall of the lower box body (1) is provided with a connecting portion (7) for connecting to a stretching machine; the connecting portion (7) includes a connecting plate (71) and two connecting columns (72) slidably connected to the bottom of the connecting plate (71); a T-shaped slide groove (711) is provided at the bottom of the connecting plate (71), and a T-shaped protrusion (721) adapted to be connected to the T-shaped slide groove (711) is provided at the top of the connecting column (72); a pin shaft hole (722) for installing the stretching machine is provided on the connecting column (72).

3. The auxiliary device for low temperature tensile test of metal materials according to claim 1, characterized in that: An annular groove is formed on the outer wall of the columnar connecting rod (5) where the piston ring (6) is located, and an inner wall portion of the piston ring (6) is embedded in the annular groove.

4. The auxiliary device for low temperature tensile test of metal materials according to claim 1, characterized in that: One end surface of the piston ring (6) is a plane, and the other end surface is provided with a V-shaped groove (61). The outer side wall of the piston ring (6) is provided with an annular groove (62) for storing grease.

5. The auxiliary device for low temperature tensile test of metal materials according to claim 1, characterized in that: The columnar connecting rod (5) extends to the outside of the columnar channel (21).

6. The auxiliary device for low temperature tensile test of metal materials according to claim 1, characterized in that: The outer walls of the lower box body (1) and the upper box body (2) are covered with thermal insulation cotton (8).

7. The auxiliary device for low temperature tensile test of metal materials according to claim 1, characterized in that: The upper end surface of the lower box body (1) is covered with a rubber pad, and the lower end surface of the upper box body (2) is covered with a rubber pad.

8. The auxiliary device for low temperature tensile test of metal materials according to claim 1, characterized in that: The upper and lower clamp assemblies (4) are coaxial, and the clamp assembly (4) includes two symmetrically arranged clamping arms (41), and a plurality of lead screws (42) are vertically penetrated on the clamping arms (41). The plurality of lead screws (42) are rotatably connected to a stretching clamp block (43) near the end of the clamping arm (41) on the other side, and the two stretching clamp blocks (43) are arranged in parallel, and the lead screws (42) are threadedly connected to the clamping arms (41). The inner side surface of the stretching clamp block (43) is provided with a T-shaped groove running through the front and back, and a protective cushion (44) with a T-shaped protrusion is clamped and installed inside the T-shaped groove.

9. The auxiliary device for low temperature tensile test of metal materials according to claim 8, characterized in that: The end of the lead screw (42) away from the other side of the clamping arm (41) is vertically connected to a handle (45).

10. The auxiliary device for low temperature tensile test of metal materials according to claim 8, characterized in that: A conical protrusion is provided on one side of the protective soft pad (44) close to the other protective soft pad (44), and the thickness of the protective soft pad (44) is greater than 1 cm.

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