Low-temperature steel bar ultralow-temperature stretching device

Abstract

The utility model relates to the technical field of reinforcing steel bar detection, and particularly discloses a low-temperature reinforcing steel bar ultralow-temperature stretching device which comprises a low-temperature box, a mounting piece and a connecting piece, a through hole for the mounting piece to movably penetrate through is formed in the low-temperature box, and the mounting piece is movably inserted into the low-temperature box. The two ends of the to-be-tested steel bar are fixedly connected with the two connecting pieces through welding, the two connecting pieces are detachably connected with the two mounting pieces, and the to-be-tested steel bar is connected with the connecting pieces through friction welding; according to the utility model, through the specific arrangement of the connecting piece, the connecting piece is prevented from being broken during testing; the connecting piece is in friction welding with the to-be-tested reinforcing steel bar, and the tensile strength of the welding part is greater than that of the to-be-tested reinforcing steel bar body, so that the to-be-tested reinforcing steel bar in the low-temperature box can be broken from the to-be-tested reinforcing steel bar body in the stress test process, and the success rate of the tensile test of the to-be-tested reinforcing steel bar is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a low temperature reinforcing steel bar super low temperature tensile device belongs to low temperature reinforcing steel bar testing technical field. BACKGROUND

[0002] Low temperature reinforcing steel bar is widely used in liquefied natural gas storage tank gas and various low temperature storage tanks, and the construction of liquefied natural gas storage tank needs low temperature reinforcing steel bar of -165 degrees, and the key performance is the low temperature tensile property of reinforcing steel bar in the environment of -165 degrees. The low temperature tensile property sample of low temperature reinforcing steel bar does not allow reinforcing steel bar turning, so as to ensure that the sample detection performance can fully reflect the actual performance of reinforcing steel bar. The low temperature tensile test requires that the sample is completely in the low temperature environment, and the strength of steel will increase under the low temperature environment, and if only a low temperature environment box is added to the reinforcing steel bar tensile testing machine at normal temperature, the actual measurement of reinforcing steel bar will be broken at the position outside the box, and the conventional test method cannot meet the requirements of low temperature tensile test. The clamp of the tensile testing machine cannot work in the low temperature environment of -165 degrees, so the clamp cannot be wrapped in the low temperature environment box. It is necessary to find a convenient and effective test method for super low temperature tensile test of low temperature reinforcing steel bar. SUMMARY

[0003] In view of the defects of the prior art, the utility model provides a low temperature reinforcing steel bar super low temperature tensile device.

[0004] The low temperature reinforcing steel bar super low temperature tensile device of the utility model, including low temperature box, mounting piece, connecting piece and the steel bar to be measured, the through hole for the activity of mounting piece is set up on the low temperature box, the mounting piece is inserted in the low temperature box, and the both ends of the steel bar to be measured are fixedly connected with the two connecting pieces through welding, the two connecting pieces are detachably connected with the two mounting pieces, and the two connecting pieces are used for the clamping mechanism of reinforcing steel bar tensile equipment and are clamped.

[0005] In some embodiments, the steel bar to be measured and the connecting piece are connected through friction welding.

[0006] In some embodiments, the connecting piece is round steel with a diameter greater than that of the steel bar to be measured, and the connecting piece is made of the same material as the steel bar to be measured.

[0007] In some embodiments, the mounting piece comprises a mounting end and a clamping end, the clamping end can be designed according to the clamping mechanism of the reinforcing steel bar tensile equipment, and the mounting end (21) of the mounting piece is provided with a connecting hole matched with the connecting piece.

[0008] In some embodiments, the surface of the connecting piece is turned to form external threads, and the inner wall of the connecting hole of the mounting piece is provided with internal threads matched with the external threads.

[0009] In some embodiments, the end adjacent to the steel bar to be measured of the connecting hole comprises a plurality of hole grooves with gradually decreasing diameters in sequence upwards.

[0010] In some embodiments, the connecting hole inner wall central fixed connection butt joint rod;

[0011] The connecting piece is provided with a butt joint hole matched with the butt joint rod at one end away from the steel bar to be tested, and the butt joint rod is threadedly connected with the butt joint hole.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] The connecting piece is provided with a butt joint hole matched with the butt joint rod at one end away from the steel bar to be tested, and the butt joint rod is threadedly connected with the butt joint hole. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0015] Figure 1 It is a front view structure schematic diagram of the utility model embodiment one;

[0016] Figure 2 It is a front view structure schematic diagram of the utility model embodiment two.

[0017] In the drawing: 1, cryogenic tank; 2, mounting piece; 21, mounting end; 22, clamping end; 23, connecting hole; 24, butt joint rod;

[0018] 3, connecting piece; 31, butt joint hole;

[0019] 4, steel bar to be tested. DETAILED DESCRIPTION

[0020] The following will disclose a plurality of embodiments of the utility model with drawings, for the purpose of clear description, many details on the actual object will be described in the following description. However, it should be understood that these details on the actual object should not be used to limit the utility model. That is to say, in some embodiments of the utility model, these details on the actual object are unnecessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be drawn in a simple schematic manner in the drawings.

[0021] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and does not mean to particularly indicate the order or sequence, nor to limit the present application, which is only to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0022] Embodiment one:

[0023] Please refer to Figure 1 The low-temperature steel bar ultra-low-temperature stretching device of the present application comprises a low-temperature box 1, a mounting piece 2, a connecting piece 3 and a steel bar to be tested 4. A through hole is formed in the low-temperature box 1 for the mounting piece 2 to pass through. The mounting piece 2 is movably inserted into the low-temperature box 1. The two ends of the steel bar to be tested 4 are fixedly connected to the two connecting pieces 3 by welding. The two connecting pieces 3 are detachably connected to the two mounting pieces 2. The two connecting pieces 3 are clamped by the clamping mechanism of the steel bar stretching device.

[0024] The steel bar to be tested 4 is connected to the connecting piece 3 by friction welding.

[0025] The connecting piece 3 is a round steel with a diameter larger than that of the steel bar to be tested 4, and the material of the connecting piece 3 is the same as that of the steel bar to be tested 4.

[0026] The mounting piece 2 comprises a mounting end 21 and a clamping end 22. The clamping end 22 can be designed according to the clamping mechanism of the steel bar stretching device. The mounting end 21 of the mounting piece 2 is provided with a connecting hole 23 matched with the connecting piece 3.

[0027] An outer thread is formed on the surface of the connecting piece 3 by turning. An inner thread matched with the outer thread is formed on the inner wall of the connecting hole 23 of the mounting piece 2.

[0028] A low-temperature steel bar ultra-low-temperature stretching method

[0029] S1, the sample of the steel bar to be tested 4 is sawn to the required length according to the requirements, and the sawn surface is processed flat;

[0030] S2, the connecting piece 3 is formed by turning the round steel of the same material as the steel bar to be tested 4, and the diameter of the connecting piece 3 is larger than that of the steel bar to be tested 4, and the tensile strength is greater than that of the steel bar to be tested 4;

[0031] S3, the threaded joint is welded with the steel bar 4 sample by friction welding, and the stress relief is carried out by 100 degrees for 1h after welding;

[0032] S4, the connecting piece 3 is turned after the steel bar 4 is welded to finish the outer thread;

[0033] S5, the two connecting pieces 3 are screwed into the connecting hole 23 of the mounting piece 2 respectively, and the steel bar 4 is located in the low temperature box 1, wherein the two mounting pieces 2 are respectively through the through hole of the low temperature box 1 and the low temperature box 1;

[0034] S6, the clamping end 22 of the two mounting pieces 2 is connected with the clamping mechanism of the steel bar stretching equipment respectively, and then the steel bar stretching equipment is started to carry out the experiment.

[0035] In this embodiment:

[0036] By making the connecting piece 3 and the steel bar 4 be the same material, and the diameter of the connecting piece 3 is greater than the steel bar 4, so that the tensile strength of the connecting piece 3 is greater than the steel bar 4, so as to avoid the fracture of the connecting piece 3 during the test; and the connecting piece 3 and the steel bar 4 are connected by friction welding, and due to the characteristics of friction welding, the tensile strength of the connecting piece 3 is greater than the steel bar 4 after friction welding, that is, it can be ensured that the steel bar 4 in the low temperature box 1 is fractured in the steel bar 4 during the stress test, and the success rate of the steel bar 4 tensile test is ensured; and the steel bar 4 is not processed during the test, the original surface of the sample is completely reserved, and the sample detection performance can fully reflect the actual performance of the steel bar.

[0037] Preferably, the connecting piece 3 is a disposable piece, and the mounting piece 2 can be repeatedly used.

[0038] Embodiment two:

[0039] Please refer to Figure 2 As a further improvement of embodiment one, the end of the connecting hole 23 adjacent to the steel bar 4 includes a plurality of hole grooves with gradually reduced diameters in sequence.

[0040] The inner wall of the connecting hole 23 is fixedly connected with the butt joint rod 24;

[0041] The end of the connecting piece 3 away from the steel bar 4 is provided with a butt joint hole 31 matched with the butt joint rod 24, and the butt joint rod 24 is threadedly connected with the butt joint hole 31.

[0042] In this embodiment:

[0043] By making the connecting hole 23 on the mounting piece 2 include a plurality of gradually reduced diameter hole grooves, a plurality of diameters of the connecting piece 3 can be corresponded, so that the diameter of the connecting piece 3 is proportional to the diameter of the to-be-tested steel bar 4 in the tensile test of the to-be-tested steel bar 4 of different diameters, and the mounting piece 2 does not need to be replaced;

[0044] The setting of the connecting rod 24 in the connecting piece 3 cooperates with the connecting hole 31 on the connecting piece 3, so that the connecting piece 3 can be guided and the connection with the connecting piece 3 is strengthened.

[0045] The above only describes the embodiments of the present application and is not used to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made in the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A low-temperature steel bar ultra-low temperature tensile testing device, comprising a low-temperature chamber (1), an installation component (2), a connector (3), and a steel bar to be tested (4), characterized in that: The low-temperature chamber (1) has a through hole for the installation component (2) to pass through. The installation component (2) is movably inserted into the low-temperature chamber (1). The two ends of the steel bar (4) to be tested are fixedly connected to the two connecting components (3) by welding. The two connecting components (3) are detachably connected to the two installation components (2). The two connecting components (3) are used for clamping by the clamping mechanism of the steel bar stretching equipment.

2. The low-temperature steel bar ultra-low temperature tensile device according to claim 1, characterized in that: The steel bar (4) to be tested is connected to the connector (3) by friction welding.

3. The low-temperature steel bar ultra-low temperature tensile device according to claim 1, characterized in that: The connector (3) is a round steel bar with a diameter larger than that of the reinforcing bar (4) to be tested, and the connector (3) is made of the same material as the reinforcing bar (4) to be tested.

4. The low-temperature steel bar ultra-low temperature tensile device according to claim 1, characterized in that: The mounting component (2) includes a mounting end (21) and a clamping end (22). The clamping end (22) can be designed according to the clamping mechanism of the rebar stretching equipment. The mounting end (21) of the mounting component (2) is provided with a connecting hole (23) that is compatible with the connecting component (3).

5. The low-temperature steel bar ultra-low temperature tensile device according to claim 1, characterized in that: The surface of the connector (3) is machined to form an external thread, and the inner wall of the connecting hole (23) of the mounting part (2) is provided with an internal thread that matches the external thread.

6. The low-temperature steel bar ultra-low temperature tensile device according to claim 5, characterized in that: The end of the connecting hole (23) adjacent to the steel bar (4) to be tested includes a plurality of slots with gradually decreasing diameters.

7. The low-temperature steel bar ultra-low temperature tensile device according to claim 6, characterized in that: The connecting rod (24) is fixedly connected to the center of the inner wall of the connecting hole (23); The connector (3) has a mating hole (31) at one end away from the reinforcing bar (4) to be tested, which is adapted to the mating rod (24). The mating rod (24) is threadedly connected to the mating hole (31).

Images