Reinforced bar tensile strength testing device

Abstract

The utility model relates to a reinforcing steel bar tensile strength detection device belongs to reinforcing steel bar detection technical field, this reinforcing steel bar tensile strength detection device, include: the frame of detection device, the inside upper portion of frame is provided with driving piece, through setting recess in locking assembly cooperation clamping plate, can after locking to the end of reinforcing steel, only need to exert the tension, multiple clamping plates will displace together and the taper portion of recess is pasted together, can make multiple clamping plates pressure simultaneously and increase the clamping force of reinforcing steel end, can reach the effect that the greater the fixed effect is better the tension, through setting the fit groove, the fit groove is set with multiple and the angle is consistent with the thread setting angle of the present reinforcing steel surface angle array, therefore when clamping plate is clamped to reinforcing steel, the fit groove can be completely fit with the thread of reinforcing steel surface, thereby improving the clamping effect of clamping plate to reinforcing steel end.

Description

Technical Field

[0001] This utility model relates to the field of rebar testing technology, and in particular to a device for testing the tensile strength of rebar. Background Technology

[0002] Reinforcing bar testing is the process of inspecting the quality, specifications, and performance of reinforcing bars to ensure they meet building design and safety standards. Testing items include the diameter, strength, surface texture, and chemical composition of the reinforcing bars. Commonly used testing methods include tensile testing, bending testing, and chemical composition analysis. When conducting tensile testing, a reinforcing bar tensile strength testing device is required.

[0003] A search revealed Chinese patent "A Rebar Tensile Strength Testing Device" (authorization announcement number CN219777355U). This utility model discloses a rebar tensile strength testing device, including a base. A sliding frame is fixedly installed at the center of the top of the base. Sliding grooves are formed on the inner sides of the sliding frame near the upper and lower ends. Guide rods are fixedly installed on the inner walls of the front and rear ends of the sliding frame near the center of both sides. A fixing frame is fixedly installed at the center of the front and rear ends of the top of the base. A cylinder is fixedly installed at the upper end of the fixing frame. A tensile tester is fixedly installed at one end of the output shaft of the cylinder. A connecting plate is fixedly installed at the front end of the tensile tester. An installation plate is fixedly installed at the front end of the connecting plate. An adjustment component is fixedly installed through the installation plate at the center of the front and rear ends. This rebar tensile strength testing device facilitates the fixing of rebars, prevents rebars from falling off during testing, and improves the accuracy of the test.

[0004] Although the above-mentioned testing device can conveniently fix the reinforcing bars using the adjustment components, the contact area with the reinforcing bars is small because the surface of the components that come into contact with the reinforcing bars is relatively smooth and the contact points are consistent. In addition, since the above-mentioned adjustment components fix the reinforcing bars by horizontal displacement, the structure used to fasten the reinforcing bars is prone to increased wear and tear on the surrounding structure due to the stretching of the reinforcing bars during tensile testing. Furthermore, long-term use may also cause deformation of the clamping components. Utility Model Content

[0005] Therefore, it is necessary to provide a steel bar tensile strength testing device to address the problems of steel bar slippage risk, easy exacerbation of structural wear due to unilateral stress, and potential deformation of main contact components due to long-term use in the aforementioned testing devices.

[0006] A steel bar tensile strength testing device includes: a frame for the testing device, wherein a driving component is provided on the upper inner side of the frame; The locking components are provided in two parts, which are respectively located on the inner bottom plate of the frame and below the driving end of the driving component; The locking component includes a clamping plate disposed in the frame. The clamping plate is generally tapered and has a matching groove inside.

[0007] In one embodiment, the locking assembly further includes a housing with a groove inside, the groove having the same shape as the clamp and both being tapered.

[0008] In one embodiment, the diameter of the groove is larger than that of the clamping plate, and there are four clamping plates, all of which are located in the groove.

[0009] In one embodiment, each of the four clamps has a contact portion on its opposite side, and the opposite side of each of the four contact portions is arc-shaped.

[0010] In one embodiment, the mating groove is formed on the surface of the contact portion, and the mating groove is formed in a rectangular array of multiple grooves.

[0011] In one embodiment, the overall angle of the fitting groove is sixty degrees.

[0012] In one embodiment, the inner wall of the housing is provided with a through groove, and a slide rod is fixedly connected to the inner wall of the through groove. The slide rod is designed vertically, and a sliding sleeve is slidably connected to the surface of the slide rod. A telescopic rod is fixedly connected inside the sliding sleeve. The telescopic rod is designed horizontally, and the telescopic end of the telescopic rod is fixedly connected to the clamping plate.

[0013] In one embodiment, the surface of the telescopic rod is provided with a spring, and the two ends of the spring are fixedly connected to the inner wall of the sliding sleeve and the surface of the clamping plate, respectively.

[0014] Beneficial effects 1. By setting the groove in the locking component to cooperate with the clamping plate, after locking the end of the steel bar, only a tensile force needs to be applied, and multiple clamping plates will move upward together and fit with the conical part of the groove. This allows multiple clamping plates to be compressed at the same time and increases the clamping force on the end of the steel bar, so that the greater the tensile force, the better the fixing effect. 2. By setting a matching groove, multiple matching grooves are arranged in a rectangular array and the angle of each groove is consistent with the thread setting angle of the existing steel bar surface. Therefore, when the clamping plate clamps the steel bar, the matching groove can fully match the thread on the surface of the steel bar, thereby improving the clamping effect of the clamping plate on the end of the steel bar. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the locking component of this utility model; Figure 3 This is a schematic diagram of the internal structure of the locking component of this utility model; Figure 4 This is a schematic diagram of the structure of the clamping plate of this utility model. Figure 5 This is a front view schematic diagram of the clamping plate of this utility model.

[0017] Figure label: 1. Frame; 2. Locking assembly; 201. Housing; 202. Clamping plate; 203. Slide rod; 204. Slide sleeve; 205. Spring; 206. Contact part; 207. Fitting groove; 3. Driving component. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] The following is combined with Figure 1 - Figure 5 This invention describes a device for testing the tensile strength of reinforcing bars.

[0020] In one embodiment, the steel bar tensile strength testing device includes: a frame 1 of the testing device, and a driving component 3 is provided on the upper inner side of the frame 1; Locking component 2, there are two locking components 2, which are respectively located on the inner bottom plate of frame 1 and below the driving end of driving component 3; The drive unit 3 consists of a screw drive structure located above the frame 1 and a hydraulic cylinder located below the drive end of the screw drive structure. The screw drive structure consists of a motor, a screw, and a threaded sleeve. The motor is located on the side of the frame 1, and the screw is located on the upper inner side of the frame 1 through a bearing seat. The threaded sleeve has a square design and is threaded onto the surface of the screw. The upper part of the threaded sleeve is in contact with the top plate of the frame 1, and the lower part is fixed to the hydraulic cylinder. The screw drive structure is used to adjust the lateral position of the locking component 2, and the hydraulic cylinder is used to stretch the locking component 2 to perform tensile testing. like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the locking assembly 2 includes a clamping plate 202 disposed in the frame 1. The clamping plate 202 is generally tapered, and a fitting groove 207 is provided inside the clamping plate 202. The locking assembly 2 also includes a housing 201. A groove is provided inside the housing 201. The groove has the same shape as the clamping plate 202 and is also tapered. The diameter of the groove is larger than that of the clamping plate 202. There are four clamping plates 202, all of which are located in the groove. A through groove is provided on the inner wall of the housing 201. A sliding rod 203 is fixedly connected to the inner wall of the through groove. The sliding rod 203 is vertically designed. A sliding sleeve 204 is horizontally slidably connected to the surface of the sliding rod 203. A telescopic rod is fixedly connected inside the sliding sleeve 204. The telescopic rod is horizontally designed. The telescopic end of the telescopic rod is fixedly connected to the clamping plate 202. A spring 205 is provided on the surface of the telescopic rod. The two ends of the spring 205 are fixedly connected to the inner wall of the sliding sleeve 204 and the surface of the clamping plate 202, respectively. First, the workers place both ends of the steel bar into the two housings 201 respectively. When the ends of the steel bar approach the clamping plate 202, because the upper part of the clamping plate 202 is an inverted cone design, multiple clamping plates 202 will be opened until the steel bar penetrates into the clamping plate 202. Then, the spring 205 will drive the clamping plate 202 to move and approach the steel bar, which can clamp and position the steel bar. After both ends of the reinforcing bar are fixed, the driving component 3 will drive the upper locking component 2 to perform a tensile test on the reinforcing bar. Since the driving end of the driving component 3 pulls the housing 201 and the clamping plate 202 contacts the reinforcing bar, during the stretching, the outer end of the clamping plate 202 will extend outward from the housing 201. At this time, the surface of the clamping plate 202 will fit against the inner wall of the groove. After the conical oblique extrusion, the pressure between the multiple clamping plates 202 will gradually increase, thereby stably clamping the end of the reinforcing bar and preventing slippage. Each of the four clamping plates 202 has a contact part 206 on one opposite side, and the opposite side of each of the four contact parts 206 is arc-shaped. When the reinforcing bar is inserted into the multiple clamps 202, the springs 205 on the opposite side of the multiple clamps 202 will contract. Since the opposite side of the multiple clamps 202 is arc-shaped, it can conform to the cylindrical shape of the reinforcing bar, thus adapting to reinforcing bars of different sizes and achieving the effect of positioning multiple types of reinforcing bars. The mating groove 207 is formed on the surface of the contact portion 206, and multiple mating grooves 207 are formed in a rectangular array; the overall angle of the mating groove 207 is sixty degrees; A matching groove 207 is provided inside the clamping plate 202. Multiple matching grooves 207 are arranged in a rectangular array. The density of the number of matching grooves is greater than the number of threads on the surface of traditional steel bars. Therefore, after the end of the steel bar is inserted into multiple clamping plates 202, the adjacent matching grooves 207 can automatically match the threads on the surface of the steel bar to form a fit. This can improve the friction and connection effect between the clamping plate 202 and the steel bar, thereby ensuring that the steel bar will not slip during tensile testing. It should be noted that the above-mentioned hydraulic cylinder is an HSG series engineering hydraulic cylinder with a rated pressure of 31.5MPa, a cylinder diameter of 63mm, and the teeth of the 207 meshing groove are made of 20CrMnTi carburized and quenched, with a tooth surface hardness of HRC58-62. There are two locking components 2, which are respectively located on the upper and lower inner sides of the frame 1. The two housings 201 are equipped with clamping platforms on opposite sides. The movable clamping platform located on the upper inner side of the frame 1 is equipped with a high-precision force sensor. The static clamping platform is equipped with a non-contact optical strain measurement probe on its side. During the test, the optical probe monitors the deformation of the gauge length section. The computer collects force-displacement data in real time and generates a test report. Working principle: In actual use, the operator first places both ends of the rebar into the two housings 201 respectively. When the end of the rebar approaches the clamping plate 202, due to the inverted cone design of the upper part of the clamping plate 202, multiple clamping plates 202 will be opened until the rebar penetrates into the clamping plate 202. Then, the spring 205 will drive the clamping plate 202 to move and move closer to the rebar, which can clamp and position the rebar. After both ends of the rebar are fixed, the driving component 3 will drive the upper locking component 2 to perform a tensile test on the rebar. Because the driving end of the driving component 3 pulls the housing 2... 01, while the clamping plate 202 is in contact with the reinforcing bar, so during tensioning, the outer end of the clamping plate 202 will extend outward from the shell 201. At this time, the surface of the clamping plate 202 will fit against the inner wall of the groove. After the conical oblique extrusion, the pressure between multiple clamping plates 202 will gradually increase, thereby clamping the end of the reinforcing bar tightly. At the same time, the matching groove 207 in the clamping plate 202 can fit with the thread on the surface of the reinforcing bar, which can improve the friction and connection effect between the clamping plate 202 and the reinforcing bar, thereby ensuring that the reinforcing bar will not slip during the tensile test.

[0021] It should be noted that the motor, lead screw, threaded sleeve, hydraulic cylinder, and non-contact optical strain measurement probe mentioned above are all devices with relatively mature existing technologies. Specific models can be selected according to actual needs. At the same time, the motor and non-contact optical strain measurement probe can be powered by the built-in power supply or by the mains power. The specific power supply method can be selected according to the situation. In addition, the specific operating principles and usage steps of the above structures can be found on the webpage and will not be repeated here.

[0022] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for testing the tensile strength of reinforcing bars, characterized in that, include: The frame (1) of the detection device has a drive component (3) disposed on the upper inner side of the frame (1). Locking component (2), wherein there are two locking components (2) respectively located on the inner bottom plate of the frame (1) and below the driving end of the driving component (3); The locking component (2) includes a clamping plate (202) disposed in the frame (1). The clamping plate (202) is generally tapered, and a fitting groove (207) is provided inside the clamping plate (202).

2. The steel bar tensile strength testing device according to claim 1, characterized in that, The locking component (2) also includes a housing (201), the inside of which is provided with a groove, the shape of which is the same as that of the clamping plate (202) and both are tapered.

3. The steel bar tensile strength testing device according to claim 2, characterized in that, The diameter of the groove is larger than that of the clamping plate (202), and there are four clamping plates (202) all located in the groove.

4. The steel bar tensile strength testing device according to claim 2, characterized in that, Each of the four clamps (202) has a contact part (206) on one side opposite to the other, and each of the four contact parts (206) has an arc-shaped design on one side opposite to the other.

5. The steel bar tensile strength testing device according to claim 1, characterized in that, The mating groove (207) is formed on the surface of the contact portion (206), and the mating groove (207) is formed in a rectangular array of multiple grooves.

6. The steel bar tensile strength testing device according to claim 1, characterized in that, The overall angle of the fitting groove (207) is sixty degrees.

7. The steel bar tensile strength testing device according to claim 2, characterized in that, The inner wall of the housing (201) is provided with a through groove, and a slide rod (203) is fixedly connected to the inner wall of the through groove. The slide rod (203) is designed vertically, and a sliding sleeve (204) is slidably connected to the surface of the slide rod (203). A telescopic rod is fixedly connected inside the sliding sleeve (204). The telescopic rod is designed horizontally, and the telescopic end of the telescopic rod is fixedly connected to the clamping plate (202).

8. The steel bar tensile strength testing device according to claim 7, characterized in that, The surface of the telescopic rod is provided with a spring (205), and the two ends of the spring (205) are fixedly connected to the inner wall of the sliding sleeve (204) and the surface of the clamping plate (202), respectively.

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