Firmly-fixed reinforcing steel bar tension test device

Abstract

The invention relates to the technical field of reinforcing steel bar tension test, and discloses a firmly fixed reinforcing steel bar tension test device, which comprises a tension tester shell, an upper clamping group and a lower clamping group, the upper clamping group and the lower clamping group are both arranged on the tension tester shell, the upper clamping group is arranged above the lower clamping group, and the lower clamping group is arranged above the upper clamping group. A position adjusting rotating set is arranged in the lower clamping set, the position adjusting rotating set comprises a working groove, the working groove is formed in the lower clamping set, and a positioning rotating turbine is rotationally connected into the working groove; through the arrangement of a transmission structure of a worm, a positioning rotating turbine and a threaded rod, the vertical position of the reinforcing steel bar can be accurately adjusted in cooperation with a liftable positioning cylinder, the length of the two ends stretching into a clamping set is uniform, the problem of uneven tension distribution caused by poor centering is avoided, centering adjustment is achieved, and the test accuracy is improved; according to the device, the length centering function and the perpendicularity correction function are clearly separated, and different effects are achieved by switching states through the same mechanism structure.

Description

Technical Field

[0001] This invention relates to the field of steel bar tensile testing, specifically to a securely fixed steel bar tensile testing device. Background Technology

[0002] A rebar tensile testing device is essentially an instrument specifically designed to test the mechanical properties of rebar under tension. It applies gradually increasing tensile force to the rebar until it breaks, thereby detecting key indicators such as its strength and ductility.

[0003] Commercially available columnar rebar tensile testing devices generally suffer from problems such as difficulty in centering adjustment, poor clamping adaptability, and cumbersome verticality correction. Firstly, most devices rely on manual visual judgment of the rebar's insertion length at both ends, lacking a precise centering mechanism, leading to uneven clamping force and large fluctuations in test data. Secondly, verticality adjustment usually requires repeated measurements using external tools, over-relying on operator experience and lacking intuitive monitoring feedback. Finally, the various adjustment functions are scattered across different mechanisms, making switching inconvenient and difficult to adapt to batch testing needs.

[0004] Therefore, there is a need to provide a securely fixed steel bar tensile testing device to solve the above problems. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a securely fixed steel bar tensile testing device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a securely fixed steel bar tensile testing device, comprising a tensile testing machine housing, an upper clamping group and a lower clamping group, wherein the upper clamping group and the lower clamping group are both disposed on the tensile testing machine housing, and the upper clamping group is disposed above the lower clamping group, and an adjustment and rotation group is disposed within the lower clamping group; The adjusting rotary assembly includes a working groove located inside the lower clamping assembly. A positioning rotary turbine is rotatably connected inside the working groove. A threaded rod is threadedly connected inside the positioning rotary turbine. A vertical groove is formed on the lower surface of the threaded rod. A rectangular block is slidably connected inside the vertical groove. A rotating groove is formed inside the lower clamping assembly, and the rectangular block is slidably connected inside the rotating groove. A disc limiting rotating rod is fixedly connected to the end of the rectangular block away from the vertical groove. A first return spring is sleeved on the outer wall of the disc limiting rotating rod. A positioning block assembly is fixedly connected inside the lower clamping assembly. A worm gear is rotatably connected inside the positioning block assembly. A rotating handle is fixedly connected to the end of the worm gear away from the lower clamping assembly.

[0007] Preferably, the adjusting and rotating assembly further includes a bearing disk, the inner wall of which is fixedly connected to the bottom of the threaded rod, and three arc-shaped rods are fixedly connected in a ring on the outer wall of the bearing disk. An arc-shaped groove is provided inside the lower clamping assembly, and the three arc-shaped rods are slidably connected inside the arc-shaped groove.

[0008] Preferably, a fixing component is provided at the top of the threaded rod, and a positioning cylinder is fixedly connected to the top of the threaded rod. The positioning cylinder is fixedly connected to the top of the threaded rod, and six fixing blocks are fixedly connected in a ring on the upper surface of the positioning cylinder. Each fixing block has a grooved sliding plate slidably connected to its outer wall.

[0009] Preferably, the fixing component further includes six clamping pieces, all of which are fixedly connected to the side of the grooved slide away from the fixing block. A second return spring is fixedly connected to the outer wall of the grooved slide, and the end of the second return spring away from the grooved slide is fixedly connected to the fixing block.

[0010] Preferably, both the upper clamping group and the lower clamping group are provided with a perpendicularity detection group. The perpendicularity detection group includes two square blocks, which are respectively clamped onto the upper clamping group and the lower clamping group. Each of the two square blocks has a detection rod inside. The outer wall of each of the two detection rods is fixedly connected to a positioning plate. The inner wall of each of the two detection rods is rotatably connected to a limit strip. The outer wall of each of the two limit strips is fixedly connected to a third return spring. The end of the third return spring away from the limit strip is fixedly connected to the positioning plate. The inner wall of each of the two detection rods is slidably connected to an abutment. The inner wall of the abutment is fixedly connected to a toothed plate.

[0011] Preferably, the verticality detection group further includes a dial indicator, which is fixedly connected to a square block on the lower clamping group. The detection rod on the lower clamping group is slidably connected between the dial indicator and the inside of the square block. The detection rod on the upper clamping group is fixedly connected to the inside of the square block. An alarm light is installed at the bottom of the lower clamping group.

[0012] Preferably, the worm gear meshes with the positioning rotary turbine, the disc limiting rotary rod is slidably rotatably connected inside the lower clamping assembly, one end of the first return spring is fixedly connected to the lower clamping assembly, and the other end of the first return spring abuts against the disc limiting rotary rod.

[0013] Preferably, each clamping piece has anti-slip texture on the side away from the grooved slide plate, and the top of each clamping piece on the side away from the grooved slide plate is set as a slope.

[0014] Preferably, the limiting strip abuts against the toothed plate, and the ends of the two abutting heads furthest from the detection rod are both set as arc surfaces.

[0015] The present invention provides a securely fixed steel bar tensile testing device. Compared with the prior art, the advantages of the present invention are: Through the transmission structure of worm gear, positioning rotary turbine, and threaded rod, and in conjunction with the liftable positioning cylinder, the vertical position of the steel bar can be precisely adjusted to ensure that the length of the two ends extending into the clamping group is uniform. This avoids the problem of uneven tension distribution caused by poor alignment, improves the reliability of test data, realizes alignment adjustment, and enhances test accuracy. By using the clamping plate and the second reset spring, the spring is used for clamping, which achieves flexible and uniform clamping, ensures the stability of the initial clamping, and avoids damage to the surface of the specimen. It is suitable for testing steel bars of various specifications. By incorporating a double contact head, dial indicator, and alarm light, the system achieves intuitive monitoring and automatic correction of verticality without the need for external tools. When the rebar is not vertical, the dial indicator pointer deflects significantly. As the rebar is rotated and adjusted, the pointer gradually returns to the center, and the alarm light goes out, indicating that the rebar is now vertical. This design simplifies the verticality adjustment process and reduces reliance on the operator's experience.

[0016] This device clearly separates the "length alignment" and "verticality correction" functions. Through the same mechanism, different effects are achieved by switching states. The operation logic is clear. With the help of the rotation locking mechanism (rectangular block, vertical groove, rotating groove, etc.), the adjustment mode can be quickly switched when needed, which not only ensures the adjustment accuracy but also improves the operation efficiency, making it suitable for batch testing scenarios. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the overall positional relationship of the device in this invention; Figure 2 This is a cross-sectional view of the overall device in this invention; Figure 3 For the present invention Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 This is a schematic diagram showing the positional relationship between the square card block, the detection rod, and the dial indicator in this invention; Figure 5 For the present invention Figure 4 Enlarged view of the structure at point B in the middle; Figure 6 This is a schematic diagram showing the positional relationship between the square card block and the detection rod in this invention; Figure 7 For the present invention Figure 6 Enlarged view of the structure at point C; Figure 8 This is a schematic diagram showing the positional relationship between the upper clamping group, lower clamping group, square card block, detection rod, and dial indicator in this invention; Figure 9This is a schematic diagram showing the positional relationship between the lower clamping assembly, the threaded rod, and the positioning cylinder in this invention; Figure 10 For the present invention Figure 9 Enlarged view of the structure at point D; Figure 11 This is a schematic diagram showing the positional relationship between the working groove, the positioning rotary turbine, the threaded rod, the bearing disc, and the arc rod in this invention. Figure 12 For the present invention Figure 11 Enlarged view of the structure at point E in the middle; Figure 13 This is a schematic diagram showing the positional relationship between the rectangular block, the rotating groove, and the disc-limiting rotating rod in this invention; Figure 14 This is a schematic diagram showing the positional relationship between the positioning cylinder, the fixing block, and the grooved sliding plate in this invention; Figure 15 For the present invention Figure 14 Enlarged view of the structure at point F.

[0018] Reference numerals: 11. Tensile testing machine housing; 12. Upper clamping assembly; 13. Lower clamping assembly; The adjustment and rotation assembly includes: 21. Working groove; 22. Positioning rotary turbine; 23. Threaded rod; 24. Vertical groove; 251. Rectangular block; 252. Rotating groove; 26. Disc limiting rotary rod; 27. First return spring; 28. Positioning block assembly; 29. ​​Worm gear; 210. Rotating handle; 211. Bearing disc; 212. Arc-shaped rod; 213. Arc-shaped slide groove; The fixing components include: 31, positioning cylinder; 32, fixing block; 33, grooved slide plate; 34, clamping plate; 35, second return spring; The verticality detection group includes: 41. Square locking block; 42. Detection rod; 43. Positioning plate; 44. Limiting strip; 45. Third return spring; 46. Contact head; 47. Toothed plate; 48. Dial indicator; 49. Alarm light. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the invention and are not intended to limit the invention.

[0020] In the description of this invention, the terms “center,” “horizontal,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0022] Implementation, for example Figures 1 to 3 , Figures 9 to 13 As shown, a reliably fixed steel bar tensile testing device provided in an embodiment of the present invention includes a tensile testing machine housing 11, an upper clamping group 12 and a lower clamping group 13. The upper clamping group 12 and the lower clamping group 13 are both disposed on the tensile testing machine housing 11, and the upper clamping group 12 is disposed above the lower clamping group 13. An adjustment and rotation group is disposed inside the lower clamping group 13. The lower clamping assembly 13 is slidably connected to the housing 11 of the tensile testing machine, and a driving component is provided at the bottom of the lower clamping assembly 13 to drive the lower clamping assembly 13 to rise or fall.

[0023] The adjustment and rotation assembly includes a working groove 21, which is located inside the lower clamping assembly 13. A positioning rotary turbine 22 is rotatably connected inside the working groove 21. A threaded rod 23 is threadedly connected inside the positioning rotary turbine 22. A vertical groove 24 is provided on the lower surface of the threaded rod 23. A rectangular block 251 is slidably connected inside the vertical groove 24. A disc limiting rotary rod 26 is fixedly connected to the end of the rectangular block 251 away from the vertical groove 24. A first return spring 27 is sleeved on the outer wall of the disc limiting rotary rod 26. A positioning block assembly 28 is fixedly connected inside the lower clamping assembly 13. A worm gear 29 is rotatably connected inside the positioning block assembly 28. A rotating handle 210 is fixedly connected to the end of the worm gear 29 away from the lower clamping assembly 13.

[0024] It should be noted that: the worm gear 29 meshes with the disc limiting rotating rod 26, so that the worm gear 29 can drive the disc limiting rotating rod 26 to rotate. The disc limiting rotating rod 26 is slidably and rotatably connected to the inside of the lower clamping assembly 13, so that the disc limiting rotating rod 26 can drive the rectangular block 251 to disengage from the inside of the vertical groove 24. One end of the first return spring 27 is fixedly connected to the lower clamping assembly 13, and the other end of the first return spring 27 abuts against the disc limiting rotating rod 26.

[0025] like Figures 14 to 15 As shown, a fixing component is provided at the top of the threaded rod 23, and a positioning cylinder 31 is fixedly connected to the top of the threaded rod 23. The positioning cylinder 31 is fixedly connected to the top of the threaded rod 23, and six fixing blocks 32 are fixedly connected in a ring on the upper surface of the positioning cylinder 31. Each fixing block 32 has a grooved slide plate 33 slidably connected to its outer wall.

[0026] The fixing assembly also includes six clamping pieces 34, all of which are fixedly connected to the side of the grooved slide plate 33 away from the fixing block 32. A second return spring 35 is fixedly connected to the outer wall of the grooved slide plate 33, and the end of the second return spring 35 away from the grooved slide plate 33 is fixedly connected to the fixing block 32.

[0027] It should be noted that each clamping piece 34 has anti-slip texture on the side away from the grooved slide plate 33, and the top of each clamping piece 34 on the side away from the grooved slide plate 33 is set as a slope to facilitate the initial fixation of the columnar steel bar test piece.

[0028] like Figures 4 to 8 As shown, both the upper clamping group 12 and the lower clamping group 13 are equipped with perpendicularity detection groups. Each perpendicularity detection group includes two square blocks 41, which are respectively clamped onto the upper clamping group 12 and the lower clamping group 13. Each square block 41 has a detection rod 42 inside, and a positioning plate 43 is fixedly connected to the outer wall of each detection rod 42. Each detection rod 42 has a limit strip 44 rotatably connected inside, and a third return spring 45 is fixedly connected to the outer wall of each limit strip 44. The end of the third return spring 45 away from the limit strip 44 is fixedly connected to the positioning plate 43. Each detection rod 42 has a sliding contact head 46 inside, and a toothed plate 47 is fixedly connected inside the contact head 46.

[0029] The verticality testing group also includes a dial indicator 48, which is fixedly connected to a square block 41 on the lower clamping group 13. The testing rod 42 on the lower clamping group 13 is slidably connected to the dial indicator 48 and the inside of the square block 41. The testing rod 42 on the upper clamping group 12 is fixedly connected to the inside of the square block 41. An alarm light 49 is installed at the bottom of the lower clamping group 13.

[0030] It should be noted that: the limiting strip 44 abuts against the toothed plate 47, allowing the limiting strip 44 to restrict the contact head 46 through the toothed plate 47. The ends of both contact heads 46 away from the detection rod 42 are both set as arc surfaces, which facilitates the contact head 46 to detect the verticality of the columnar steel test piece. The dial indicator 48 and the alarm light 49 are connected, so that after the dial indicator 48 detects the verticality of the columnar steel test piece, the alarm light 49 can be used to understand the verticality of the columnar steel test piece. The alarm light 49 adopts a red and green dual-color design (red indicates non-vertical, green indicates vertical) and is equipped with a buzzer (volume ≥80dB). When the verticality of the columnar steel meets the standard, the light changes from red to green and is accompanied by a buzzer, taking into account both visual and auditory feedback, reducing the observation burden of the operator. The dial indicator 48 is a prior art pointer-type dial indicator. Its core working principle is to convert small linear displacements into pointer rotational movements to achieve "visualization of small displacements". This is prior art and will not be elaborated further here.

[0031] Based on the above embodiments, the following is the complete working process and working principle of the above embodiments: Working principle: In the initial state, the first reset spring 27, the second reset spring 35, and the third reset spring 45 are not compressed, and the rectangular block 251 is located inside the vertical groove 24.

[0032] During operation, columnar steel bar test specimens are usually placed manually. However, the insertion length of the columnar steel bar test specimens in the upper clamping group 12 and the lower clamping group 13 is inconsistent, which will cause the upper clamping group 12 and the lower clamping group 13 to be subjected to uneven force, resulting in deviation of tensile force distribution and ultimately leading to distorted test data.

[0033] Fixing and centering of columnar steel reinforcement test specimens: The staff first needs to insert the columnar steel bar test piece into the lower clamping group 13, and then place the columnar steel bar test piece in the positioning cylinder 31. The columnar steel bar test piece will first abut against the inclined surface of the six clamping plates 34. At this time, the columnar steel bar test piece will move towards the fixing block 32 according to its own diameter, abutting against the clamping plates 34 and the grooved sliding plate 33. At the same time, the grooved sliding plate 33 will gradually compress the second return spring 35 towards the fixing block 32. Once the bottom of the columnar steel bar test piece touches the bottom of the inner cavity of the positioning cylinder 31, the second reset spring 35 will cause the six grooved sliding plates 33 to abut against the columnar steel bar test piece through the clamping piece 34 due to its own elasticity, so that the columnar steel bar test piece is initially fixed.

[0034] Subsequently, the staff used the drive assembly to raise the lower clamping group 13, its internal positioning cylinder 31, and the columnar steel bar test piece, so that both ends of the columnar steel bar test piece were located inside the upper clamping group 12 and the lower clamping group 13.

[0035] After the columnar steel bar test piece is initially fixed, with both ends of the columnar steel bar test piece located inside the upper clamping group 12 and the lower clamping group 13, the operator rotates the rotating handle 210. When the rotating handle 210 rotates, it will drive the worm 29 to rotate synchronously around the positioning block group 28. The worm 29 meshes with the positioning rotary turbine 22, so that the rotation of the worm 29 will drive the positioning rotary turbine 22 to rotate. Subsequently, the positioning rotary turbine 22 drives the threaded rod 23 to rise or fall through the threaded groove. During the process of the threaded rod 23 rising or falling, it will drive the top positioning cylinder 31 to rise or fall synchronously. The positioning cylinder 31 will drive the top columnar steel bar test piece to rise or fall synchronously. When the staff inserts both ends of the columnar steel bar test piece into the interior of the upper clamping group 12 and the lower clamping group 13, the length is more uniform, so that when the upper clamping group 12 and the lower clamping group 13 perform tensile tests on the columnar steel bar test piece, the data is more accurate.

[0036] During the process of the threaded rod 23 rising or falling, the threaded rod 23 will pull the bearing plate 211 at the bottom to rise or fall synchronously, and the bearing plate 211 will drive the arc-shaped rod 212 on the outer wall to slide along the inside of the arc-shaped groove 213.

[0037] By using the clamping plate 34 and the second reset spring 35, the spring is used for clamping, which achieves flexible and uniform clamping, ensures the stability of the initial clamping, and avoids damage to the surface of the specimen. It is suitable for testing steel bars of various specifications. Through the transmission structure of worm gear 29, positioning rotary turbine 22, and threaded rod 23, and in conjunction with the liftable positioning cylinder 31, the vertical position of the steel bar can be precisely adjusted to ensure that the length of the two ends extending into the clamping group is uniform, avoiding the problem of uneven tension distribution caused by poor alignment, improving the reliability of test data, realizing alignment adjustment, and improving test accuracy. Adjustment of contact head 46: After the columnar rebar test piece is initially fixed, the staff needs to press the limiting strip 44 to compress the third return spring 45 towards the positioning plate 43. Then, the limiting strip 44 is released from the restriction of the toothed plate 47. Subsequently, the staff can pull the two abutment heads 46 in sequence according to the diameter of the columnar rebar test piece, so that the abutment heads 46 slide inside the detection rod 42. The ends of the two abutment heads 46 away from the detection rod 42 are both in contact with the columnar rebar test piece. Finally, stop pressing the limiting strip 44. The third return spring 45 will elastically extend and push the limiting strip 44 to abut against the toothed plate 47, thereby restricting the position of the abutment heads 46 through the toothed plate 47.

[0038] Verticality adjustment: When the staff inserts both ends of the columnar steel bar test piece into the upper clamping group 12 and the lower clamping group 13 to a uniform length, the staff needs to pull the disc limiting rotating rod 26 away from the threaded rod 23. Then the disc limiting rotating rod 26 will gradually compress the first return spring 27. At the same time, the disc limiting rotating rod 26 will drive the rectangular block 251 to move away from the vertical groove 24. Then the disc limiting rotating rod 26 will drive the rectangular block 251 to gradually slide into the interior of the rotating groove 252. Then rotate the disc limiting rotating rod 26, causing the disc limiting rotating rod 26 to drive the rectangular block 251 to rotate inside the rotating groove 252. Then the operator stops pulling the disc limiting rotating rod 26. At this time, the first return spring 27 elastically extends and pushes the disc limiting rotating rod 26 and the rectangular block 251 to move towards the vertical groove 24. After the disc limiting rotating rod 26 rotates, the first return spring 27 will elastically push the rectangular block 251 to abut against the rotating groove 252, so that the rectangular block 251 cannot abut against the vertical groove 24 on the threaded rod 23. Thus, the threaded rod 23 cannot rise or fall during the rotation of the positioning rotating turbine 22. Then, when the operator turns the handle 210 again, the handle 210 will engage with the worm gear 29 to position the rotating turbine 22 to rotate. At this time, the rectangular block 251 cannot contact the vertical groove 24 on the threaded rod 23. As a result, the rotating turbine 22 will drive the threaded rod 23 to rotate synchronously during its rotation. When the threaded rod 23 rotates, the smoothness of the rotation will be improved by the bearing plate 211 at the bottom. During the rotation of the threaded rod 23, the top positioning cylinder 31 will also rotate. At this time, the second return spring 35 will cause the six grooved slide plates 33 to abut against the columnar steel bar test piece through the clamping plate 34 due to its own elasticity, so that the columnar steel bar test piece is initially fixed. Then the positioning cylinder 31 will drive the columnar steel bar test piece to rotate synchronously. At this time, the ends of the two contact heads 46 that are away from the detection rod 42 both contact the columnar steel bar test piece. When the columnar steel bar test piece rotates around the positioning cylinder 31 in a non-perpendicular state, it will compress the contact head 46 at the end of the detection rod 42 away from the dial indicator 48 on the clamping group 13. The columnar steel bar test piece in a non-perpendicular state will move by contacting the contact head 46 and the detection rod 42, causing the detection rod 42 to slide inside the square block 41 and the dial indicator 48. The greater the distance that the detection rod 42 moves after being contacted by the columnar steel bar test piece, the greater the rotation amplitude of the pointer on the dial indicator 48. Conversely, the smaller the angle of the columnar steel bar test piece's offset, the smaller the distance that the columnar steel bar test piece moves by contacting the detection rod 42, and the smaller the rotation amplitude of the pointer on the dial indicator 48. As the columnar rebar test piece rotates, the detection rod 42 on the upper clamping group 12 contacts the rebar through the contact head 46. In conjunction with the detection system of the lower clamping group 13, the verticality of the rebar is gradually corrected. Since the dial indicator 48 and the alarm light 49 are connected, when the alarm light 49 is turned off, the columnar rebar test piece is in a vertical state with both the upper clamping group 12 and the lower clamping group 13, thereby achieving the purpose of correcting the columnar rebar test piece.

[0039] By setting up double contact heads 46, dial indicator 48, and alarm light 49, the verticality can be intuitively monitored and automatically corrected without the need for external tools for measurement and calibration. When the rebar is not vertical, the pointer of dial indicator 48 deflects significantly. As the rebar is rotated and adjusted, the pointer gradually returns to the positive position. At the same time, the alarm light 49 goes out, indicating that the rebar is vertical. This design simplifies the verticality adjustment process and reduces the reliance on the operator's experience.

[0040] This device clearly separates the "length alignment" and "verticality correction" functions. Through the same mechanism, different effects can be achieved by switching states. The operation logic is clear. With the help of the rotation locking mechanism (rectangular block 251, vertical groove 24, rotation groove 252, etc.), the adjustment mode can be quickly switched when needed, which not only ensures the adjustment accuracy but also improves the operation efficiency, making it suitable for batch testing scenarios.

[0041] While several embodiments and examples of the present invention have been described for those skilled in the art, these embodiments and examples are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included within the scope and spirit of the invention, and are included within the scope of the invention as described in the claims and its equivalents.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A securely fixed steel bar tensile testing device, comprising a tensile testing machine housing (11), an upper clamping group (12), and a lower clamping group (13), wherein the upper clamping group (12) and the lower clamping group (13) are both disposed on the tensile testing machine housing (11), and the upper clamping group (12) is disposed above the lower clamping group (13), characterized in that, The lower clamping assembly (13) is provided with an adjustment and rotation assembly; The adjusting rotation assembly includes a working groove (21), which is located inside the lower clamping assembly (13). A positioning rotary turbine (22) is rotatably connected inside the working groove (21). A threaded rod (23) is threadedly connected inside the positioning rotary turbine (22). A vertical groove (24) is formed on the lower surface of the threaded rod (23). A rectangular block (251) is slidably connected inside the vertical groove (24). A rotating groove (252) is formed inside the lower clamping assembly (13), and the rectangular block (… 251) Sliding connection inside the rotating groove (252), the rectangular block (251) is fixedly connected to a disc limiting rotating rod (26) at one end away from the vertical groove (24), the outer wall of the disc limiting rotating rod (26) is sleeved with a first reset spring (27), the lower clamping group (13) is fixedly connected to a positioning block group (28), the positioning block group (28) is rotatably connected to a worm gear (29), and the end of the worm gear (29) away from the lower clamping group (13) is fixedly connected to a rotating handle (210).

2. The reliably fixed steel bar tensile testing device according to claim 1, characterized in that, The adjustment and rotation assembly also includes a bearing disk (211), the inner wall of which is fixedly connected to the bottom of the threaded rod (23), and three arc-shaped rods (212) are fixedly connected in a ring on the outer wall of the bearing disk (211). The lower clamping assembly (13) has an arc-shaped groove (213) inside, and the three arc-shaped rods (212) are slidably connected inside the arc-shaped groove (213).

3. The reliably fixed steel bar tensile testing device according to claim 1, characterized in that, The top of the threaded rod (23) is provided with a fixing component, and the top of the threaded rod (23) is fixedly connected with a positioning cylinder (31). The positioning cylinder (31) is fixedly connected to the top of the threaded rod (23). The upper surface of the positioning cylinder (31) is fixedly connected with six fixing blocks (32) in a ring shape. The outer wall of each fixing block (32) is slidably connected with a grooved sliding plate (33).

4. The reliably fixed steel bar tensile testing device according to claim 3, characterized in that, The fixing assembly also includes six clamping pieces (34), all of which are fixedly connected to the side of the grooved slide plate (33) away from the fixing block (32). A second return spring (35) is fixedly connected to the outer wall of the grooved slide plate (33), and one end of the second return spring (35) away from the grooved slide plate (33) is fixedly connected to the fixing block (32).

5. The reliably fixed steel bar tensile testing device according to claim 1, characterized in that, Both the upper clamping group (12) and the lower clamping group (13) are provided with a verticality detection group. The verticality detection group includes two square blocks (41). The two square blocks (41) are respectively clamped on the upper clamping group (12) and the lower clamping group (13). The interior of the two square blocks (41) is provided with a detection rod (42). The outer wall of the two detection rods (42) is fixedly connected with a positioning plate (43). The interior of the two detection rods (42) is rotatably connected with a limit strip (44). The outer wall of the two limit strips (44) is fixedly connected with a third return spring (45). The end of the third return spring (45) away from the limit strip (44) is fixedly connected to the positioning plate (43). The interior of the two detection rods (42) is slidably connected with a contact head (46). The interior of the contact head (46) is fixedly connected with a toothed plate (47).

6. The reliably fixed steel bar tensile testing device according to claim 5, characterized in that, The verticality detection group also includes a dial indicator (48), which is fixedly connected to a square block (41) on the lower clamping group (13). The detection rod (42) on the lower clamping group (13) is slidably connected to the dial indicator (48) and the inside of the square block (41). The detection rod (42) on the upper clamping group (12) is fixedly connected to the inside of the square block (41). An alarm light (49) is installed at the bottom of the lower clamping group (13).

7. The reliably fixed steel bar tensile testing device according to claim 1, characterized in that, The worm gear (29) meshes with the positioning rotary turbine (22), the disc limiting rotary rod (26) is slidably and rotatably connected inside the lower clamping assembly (13), one end of the first return spring (27) is fixedly connected to the lower clamping assembly (13), and the other end of the first return spring (27) abuts against the disc limiting rotary rod (26).

8. The reliably fixed steel bar tensile testing device according to claim 4, characterized in that, Each of the clamping pieces (34) has anti-slip texture on the side away from the grooved slide plate (33), and the top of each clamping piece (34) on the side away from the grooved slide plate (33) is set as a slope.

9. A securely fixed steel bar tensile testing device according to claim 5, characterized in that, The limiting strip (44) abuts against the toothed plate (47), and the ends of the two abutting heads (46) away from the detection rod (42) are both set as arc surfaces.

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