Stretching detection device for finish rolling deformed steel bar
By designing a tensile detection device including a fixed fixture, a moving fixture and a tensile mechanism, a stable connection is formed with a threaded piece and a fine-rolled rebar sample, the sliding problem caused by the small contact area between the fixture and the sample is solved, and the accuracy of the detection data is ensured.
Patent Information
- Application Number
- CN202421035221.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-05-13
AI Technical Summary
During the tensile detection process of fine-rolled rebar, due to the small contact area between the fixture and the sample, the sliding between the fixture and the sample during the stretching process is affected, affecting the accuracy of the detection data.
A tension detection device including a fixed fixture, a moving fixture and a tensile mechanism is designed. By providing the first and second sleeves, threaded parts and tension sensors in the device, a stable connection is formed with the threaded parts and the fine-rolled rebar sample to avoid sliding between the fixture and the sample.
By directly using threaded parts that can be screwed onto the finely rolled rebar sample, a stable connection structure is formed, ensuring the accuracy of the detection data and avoiding sliding between the fixture and the sample during stretching.
Smart Images
Figure CN222618372U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a tensile detection device for finish-rolled threaded steel. Background Art
[0002] High-quality rolled rebar is mainly used as reinforcement for prestressed concrete. It is a high-strength, high-dimensional precision straight steel bar with discontinuous external threads rolled on the steel bar. The connecting pipe or high-quality rolled nut with internal threads can be screwed on the steel bar for anchoring. When testing the strength of high-quality rolled rebar, the clamp is clamped at both ends of the sample, and then the sample is tensile tested. Since the surface of the high-quality rolled rebar has threads, the contact area between the clamp and the sample is small. Therefore, during stretching, movement will occur between the clamp and the sample, affecting the accuracy of the test data. Utility Model Content
[0003] In order to solve the problem in the prior art that the accuracy of the test data is affected by the small contact area between the fixture and the finished rolled threaded steel sample, the present application proposes a tensile testing device for finished rolled threaded steel, which includes a base and a fixed fixture, a movable fixture and a stretching mechanism installed on the base, wherein the stretching mechanism is located on the side of the movable fixture away from the fixed fixture;
[0004] The fixed fixture comprises a first sleeve fixed on a base, a first annular end plate is fixedly arranged on one side of the first sleeve facing the movable fixture, a first threaded member is freely arranged in the first sleeve, and the first threaded member has an internal thread that can be engaged on the finished rolled threaded steel bar;
[0005] The movable clamp comprises a second sleeve movably mounted on the base, a second annular end plate is fixedly arranged on one side of the second sleeve facing the fixed clamp, a second threaded member is freely arranged in the second sleeve, and the second threaded member is completely accommodated in the second sleeve, and the second threaded member has an internal thread that can be engaged on the finished rolled threaded steel bar;
[0006] The stretching mechanism includes a hydraulic cylinder, the cylinder barrel of which is fixed on a base, the piston rod of which extends toward the moving clamp, and a tension sensor is installed at the end of the piston rod. A connecting portion is installed on the side of the tension sensor facing away from the hydraulic cylinder, and the connecting portion is detachably installed on the second sleeve.
[0007] When the present application is working, the two ends of the finished rolled threaded steel sample to be tested are respectively inserted into the first sleeve and the second sleeve, and then the first threaded member and the second threaded member are screwed on the two ends of the finished rolled threaded steel sample, and the length between the first sleeve and the second sleeve is set, and then the position of the movable clamp is adjusted so that the first sleeve and the second sleeve are pressed against the first annular end plate and the second annular end plate respectively, and then the connecting part is connected to the second sleeve, and finally the hydraulic cylinder is started to perform a tensile test on the finished rolled threaded steel sample. Since the present application directly uses a threaded member that can be screwed on the finished rolled threaded steel sample, it can form a stable connection structure with the finished rolled threaded steel sample, avoiding the sliding of the clamp and the finished rolled threaded steel sample during the stretching process, and ensuring the accuracy of the test data.
[0008] Furthermore, in order to enable the second sleeve to move along a set direction, a slide rail is provided on the base, and the second sleeve is slidably mounted on the slide rail.
[0009] Furthermore, a first flange is installed at one end of the second sleeve facing the stretching mechanism, and the connecting portion includes a second flange, which is detachably mounted on the first flange via bolts. Specifically, the connecting portion also includes a stretching cylinder and an end plate welded to the stretching cylinder, the second flange is welded to the stretching cylinder, and the tension sensor is fixed to the end plate. The above structure can smoothly detachably mount the connecting portion on the second sleeve, so as to facilitate the replacement of the second threaded member in the second sleeve, so as to detect the finished rolled threaded steel bars with different outer diameters.
[0010] Furthermore, in order to be able to detect the fine-rolled threaded steel bars of different outer diameters, a plurality of annular steel pads are also included, which can be freely placed in the first sleeve and the second sleeve, and the first threaded member can be pressed against the first annular end plate through the steel pad, and the second threaded member can be pressed against the second annular end plate through the steel pad. When the fine-rolled threaded steel bars with smaller outer diameters are detected, the contact area between the first threaded member and the second threaded member and the corresponding first annular end plate and the second annular end plate may be reduced, and sometimes they may fall out of the center holes of the first annular end plate and the second annular end plate, making it impossible to detect. The use of steel pads can ensure that the first threaded members and the second threaded members of different outer diameters can be effectively pressed against the first annular end plate and the second annular end plate, ensuring the smooth progress of the detection.
[0011] Furthermore, in order to reduce the number of components and improve the strength, the first sleeve and the first annular end plate are an integral component, and the second sleeve and the second annular end plate are an integral component.
[0012] Specifically, the first threaded member and the second threaded member are both precision-rolled nuts or internally threaded steel pipes, wherein the precision-rolled nuts are nuts used in conjunction with precision-rolled threaded steel, and the internally threaded steel pipe has internal threads that can be engaged with the precision-rolled threaded steel. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of an embodiment of a stretching detection device.
[0014] Figure 2 Schematic diagram of a tensile testing device provided with a steel backing plate.
[0015] Figure 3 It is a schematic diagram of the tensile testing device stretching the finished rolled rebar. DETAILED DESCRIPTION
[0016] See also Figure 1 A tensile testing device for fine-rolled threaded steel comprises a base 11 and a fixed clamp 20, a movable clamp 30 and a stretching mechanism 40 mounted on the base 11. The fixed clamp 20 and the movable clamp 30 are arranged at intervals along a first axis direction, and the stretching mechanism 40 is located on a side of the movable clamp away from the fixed clamp. Figure 1 The direction of the middle arrow Y indicates the direction of the first axis, which extends in the horizontal direction.
[0017] The fixed fixture 20 includes a first sleeve 22 fixedly mounted on the base 11, a first annular end plate 23 is fixedly arranged on the side of the first sleeve 22 facing the movable fixture 30, the first annular end plate has a first central hole 24 for the fine-rolled threaded steel sample 60 to pass through, and a first threaded member 25 is freely arranged in the first sleeve, the first threaded member has an internal thread that can be engaged with the fine-rolled threaded steel. In this embodiment, a first seat body 21 is fixedly mounted on the base, and the first sleeve is fixedly mounted on the top of the first seat body 21.
[0018] The movable fixture 30 includes a second sleeve 32 movably mounted on the base 11, a second annular end plate 33 is fixedly arranged on the side of the second sleeve 32 facing the fixed fixture 20, the second annular end plate has a second central hole 34 for the fine-rolled threaded steel sample 60 to pass through, a second threaded member 35 is freely arranged in the second sleeve, and the second threaded member is completely accommodated in the second sleeve, and the second threaded member has an internal thread that can be engaged on the fine-rolled threaded steel. In this embodiment, two slide rails 12 extending along the first axis direction are arranged on the base, the two slide rails 12 are parallel to each other, the second seat body 31 is slidably mounted on the two slide rails, and the second sleeve is fixedly mounted on the top of the second seat body 31.
[0019] The first sleeve and the first annular end plate are an integral component, and the second sleeve and the second annular end plate are an integral component. The first threaded member and the second threaded member are both precision-rolled nuts. It is understood that in another embodiment, the first threaded member and the second threaded member can also be an internally threaded steel pipe, which has an internal thread that can be engaged on the precision-rolled threaded steel.
[0020] The stretching mechanism 40 includes a hydraulic cylinder 42, a cylinder barrel 421 of the hydraulic cylinder 42 is fixed on the base via a third seat body 41, a piston rod 422 of the hydraulic cylinder 42 extends toward the direction of the movable clamp, and a tension sensor 43 is installed at the end of the piston rod. Specifically in this embodiment, the tension sensor 43 adopts an S-type tension and pressure sensor U10A, and a connecting part is installed on the side of the tension sensor away from the hydraulic cylinder, and the connecting part is detachably installed on the second sleeve.
[0021] The connection part in this embodiment specifically includes a stretching tube 44, an end plate 45 and a second flange 46, wherein the stretching tube extends along the first axis direction, the end plate 45 is welded to one end of the stretching tube facing the hydraulic cylinder, the second flange is welded to one end of the stretching tube facing the movable clamp, and a first flange 36 is installed at one end of the second sleeve facing the stretching mechanism, and bolts detachably connect the first flange 36 and the second flange 46. The tension sensor is fixed on the end plate.
[0022] See also Figure 3 When the present embodiment is working, the two ends of the finished rolled threaded steel sample 60 to be tested are respectively inserted into the first sleeve and the second sleeve, and then the first threaded member and the second threaded member are screwed on the two ends of the finished rolled threaded steel sample 60, and the length between the first sleeve and the second sleeve is made to reach a set length, and then the position of the movable clamp is adjusted so that the first sleeve and the second sleeve are pressed against the first annular end plate and the second annular end plate respectively, and then the connecting part is connected to the second sleeve, and finally the hydraulic cylinder is started to perform tensile testing on the finished rolled threaded steel sample.
[0023] To be able to test rolled rebars with different outer diameters, please refer to Figure 2 In this embodiment, a plurality of annular steel plates 51 are also provided. The steel plates 51 can be freely placed in the first sleeve and the second sleeve. The first threaded member can be pressed against the first annular end plate through the steel plates, and the second threaded member can be pressed against the second annular end plate through the steel plates. After the steel plates are provided, the first threaded member and the second threaded member of different specifications can be placed in the first sleeve and the second sleeve respectively, so that the first threaded member with a smaller outer diameter can be pressed against the first annular end plate through the steel plates, and the second threaded member with a smaller outer diameter can be pressed against the second annular end plate through the steel plates, so as to smoothly detect the finished rolled threaded steel with different outer diameters. To show clearly, Figure 2 In the embodiment, the first threaded member is arranged outside the first sleeve, and the steel pad in the first sleeve is spaced apart from the first annular end plate.
Claims
1. A tensile testing device for finished rolled threaded steel, characterized in that: It comprises a base and a fixed clamp, a movable clamp and a stretching mechanism installed on the base, wherein the stretching mechanism is located on a side of the movable clamp away from the fixed clamp; The fixed fixture comprises a first sleeve fixed on a base, a first annular end plate is fixedly arranged on one side of the first sleeve facing the movable fixture, a first threaded member is freely arranged in the first sleeve, and the first threaded member has an internal thread that can be engaged on the finished rolled threaded steel bar; The movable clamp comprises a second sleeve movably mounted on the base, a second annular end plate is fixedly arranged on one side of the second sleeve facing the fixed clamp, a second threaded member is freely arranged in the second sleeve, and the second threaded member is completely accommodated in the second sleeve, and the second threaded member has an internal thread that can be engaged on the finished rolled threaded steel bar; The stretching mechanism includes a hydraulic cylinder, the cylinder barrel of which is fixed on a base, the piston rod of which extends toward the moving clamp, and a tension sensor is installed at the end of the piston rod. A connecting portion is installed on the side of the tension sensor facing away from the hydraulic cylinder, and the connecting portion is detachably installed on the second sleeve.
2. The stretching detection device according to claim 1, characterized in that: A slide rail is arranged on the base, and the second sleeve is slidably mounted on the slide rail.
3. The stretching detection device according to claim 1, characterized in that: A first flange is installed at one end of the second sleeve facing the stretching mechanism. The connecting portion includes a second flange, and the second flange is detachably installed on the first flange via bolts.
4. The stretching detection device according to claim 3, characterized in that: The connecting part also includes a stretching cylinder and an end plate welded on the stretching cylinder, the second flange is welded on the stretching cylinder, and the tension sensor is fixed on the end plate.
5. The stretching detection device according to claim 1, characterized in that: It also includes a plurality of annular steel plates, which can be freely placed in the first sleeve and the second sleeve, the first threaded member can be pressed against the first annular end plate through the steel plate, and the second threaded member can be pressed against the second annular end plate through the steel plate.
6. The stretching detection device according to claim 1, characterized in that: The first sleeve and the first annular end plate are an integral component, and the second sleeve and the second annular end plate are an integral component.
7. The stretching detection device according to claim 1, characterized in that: The first threaded member and the second threaded member are both precision-rolled nuts or internally threaded steel pipes.