Antiskid clamping device for tensile detection of steel strand

Abstract

The utility model discloses an anti-skid clamping device for stretching detection of a steel strand. The anti-skid clamping device comprises a hydraulic chuck, the first mounting seat is arranged at the top of the hydraulic chuck, the first mounting seat is provided with a first through hole and a guide structure, and the first through hole and the guide structure are both vertically arranged; the second mounting seat is located above the first mounting seat and is in sliding connection with the guide structure, and a second through hole coaxial with the first through hole is formed in the second mounting seat; the pushing mechanism is arranged between the first mounting seat and the second mounting seat; and the clamping mechanism is arranged at the top of the second mounting seat. The hydraulic chuck and the clamping mechanism can clamp the steel strand, and the pushing mechanism can drive the second mounting seat to move upwards and apply pulling force to the steel strand, so that a clamp gasket is pressed to deform and is matched with the steel strand and teeth in shape, the steel strand is prevented from sliding relatively in the initial stage of pulling force application, the error of data acquisition in the initial stage of stretching of the steel strand is reduced, and the tensile strength of the steel strand is improved. And the effective data acquisition range in the stretching detection process is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of steel strand tensile detection clamping and positioning, in particular to an anti-slip clamping device for steel strand tensile detection. Background Art

[0002] Steel strand is an important component of some building structures. Its main stress form is tension. In engineering inspection work, it is necessary to carry out tensile testing on steel strand samples to determine whether its tensile strength meets the engineering requirements.

[0003] When performing a tensile test, the end of the steel strand is clamped by the hydraulic chuck of the tensile testing machine, and then the hydraulic chuck is driven to move, the steel strand is stretched, and the tension and deformation of the steel strand are detected. Two hydraulic chucks are provided and arranged relative to each other up and down, and the steel strand is vertically clamped between the two hydraulic chucks. Among them, the clamping side of the hydraulic chuck usually has teeth. In order to protect the teeth of the steel strand and the hydraulic chuck, it is usually necessary to place a fixture gasket between the steel strand and the hydraulic chuck (its structure can be found in patent document CN204705540U for fixture gaskets for tensile performance testing of steel strands).

[0004] For the upper hydraulic chuck, its steel strand and clamp gasket are suspended and installed, and its clamping stability is good. When stretched, the steel strand and clamp gasket basically do not slide relative to the upper hydraulic chuck. For the lower hydraulic joint, since its steel strand and clamp gasket are placed and installed, sometimes there is a placement gap due to the deviation of the placement position. In the initial stage of the steel strand being stretched, there is a certain sliding between the steel strand and the lower hydraulic chuck (the tensile force applied to the steel strand during sliding is usually 5-10KN), and the clamp gasket is compressed and deformed to compensate for the gap. When the tensile force exceeds 10KN, the compression deformation of the clamp gasket ends, and it fits the shape of the steel strand and the teeth. The steel strand is in a stable clamping state and no longer slides relative to the lower hydraulic chuck. Since the steel strand will slide relative to the hydraulic chuck in the initial stretching state, it is in an unstable clamping state, which makes the error of data collection in the initial stage of steel strand stretching very large, and the effective data collection range during the steel strand stretching detection process is narrow. Utility Model Content

[0005] The utility model aims to provide a steel strand tension detection anti-skid clamping device, which can solve the problem of large error in data collection in the initial stage of steel strand tension.

[0006] In order to achieve the above-mentioned purpose, a steel strand tensile detection anti-slip clamping device is provided, including a hydraulic chuck, which also includes: a first mounting seat, which is arranged at the top of the hydraulic chuck, and the first mounting seat is provided with a first through hole and a guide structure, and the first through hole and the guide structure are both arranged vertically; a second mounting seat, which is located above the first mounting seat and is slidably connected to the guide structure, and the second mounting seat is provided with a second through hole arranged coaxially with the first through hole; a pushing mechanism, which is arranged between the first mounting seat and the second mounting seat; and a clamping mechanism, which is arranged at the top of the second mounting seat.

[0007] According to the anti-slip clamping device for detecting the tensile strength of a steel strand, the guide structure includes a vertically arranged guide column and a spring member, the guide column is slidably inserted into the second mounting seat and is fixedly connected to the first mounting seat, the top of the guide column is provided with a limit head, and the spring member is sleeved on the guide column between the limit head and the second mounting seat.

[0008] According to the anti-slip clamping device for tensile testing of steel strands, the hydraulic chuck includes a chuck seat, a leg seat is provided at the bottom of the first mounting seat, and the leg seat has a first mating surface abutting against the top surface of the chuck seat and a second mating surface abutting against the side surface of the chuck seat.

[0009] According to the anti-skid clamping device for detecting the tensile strength of a steel strand, a mounting hole communicating with the second mating surface is provided on the leg seat, a fastening bolt is passed through the mounting hole, and the fastening bolt is inserted into the chuck seat.

[0010] According to the anti-slip clamping device for steel strand tensile testing, the pushing mechanism includes a first thrust piece, a second thrust piece and a pushing cylinder, the first thrust piece is fixedly arranged at the bottom of the second mounting seat and has a first guide inclined surface facing downward, the second thrust piece is slidably arranged at the top of the first mounting seat and has a second guide inclined surface contacting and cooperating with the first guide inclined surface, and the pushing cylinder is respectively connected to the first mounting seat and the second thrust piece.

[0011] According to the anti-slip clamping device for detecting tensile strength of a steel strand, the first thrust member and the second thrust member are both U-shaped, and the first through hole is located on the inner sides of the first thrust member and the second thrust member, the first guide bevel is provided in two and is disposed at both ends of the first thrust member, and the second guide bevel is provided in two and is disposed at both ends of the second thrust member.

[0012] According to the anti-slip clamping device for tensile testing of steel strands, the clamping mechanism includes a first guide rail, a clamping seat, a pushing piece and a first clamping cylinder, the first guide rail is fixedly arranged on the top of the second mounting seat, the clamping seats are provided in two and arranged opposite to each other, the two clamping seats are both slidably arranged on the first guide rail, the opposite sides of the two clamping seats are provided with clamping grooves, the opposite sides of the two clamping seats are provided with notches, the side walls of the notches are provided with second guide rails arranged obliquely with the first guide rail, the pushing piece is simultaneously slidably arranged on the two second guide rails, and the first clamping cylinder is respectively connected to the second mounting seat and the pushing piece.

[0013] According to the anti-slip clamping device for tensile testing of steel strands, the clamping mechanism includes a first guide rail, a clamping seat and a second clamping cylinder. The first guide rail is fixed to the top of the second mounting seat. The clamping seats are provided in two and arranged opposite to each other. Both clamping seats are slidably provided on the first guide rail. Both opposite sides of the two clamping seats have clamping grooves. A second clamping cylinder is provided on each of the opposite sides of the two clamping seats. Both second clamping cylinders are connected to the second mounting seat.

[0014] Beneficial effect: As in the above structure, the steel strand can be clamped by the hydraulic chuck and the clamping mechanism, and the second mounting seat can be driven to move upward relative to the first mounting seat through the arranged pushing mechanism, so as to apply a certain traction tension to the steel strand, so that the clamp gasket is compressed and deformed to fit the shape of the steel strand and the teeth. The steel strand can be in a stable clamping state, and the steel strand can be prevented from sliding relative to the hydraulic chuck in the initial stage of being pulled by the tensile testing machine, so that the error of data collected in the initial stage of steel strand stretching is reduced, and the effective data collection range during the steel strand stretching detection process is wider.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0017] Figure 1 It is the front view of the utility model;

[0018] Figure 2 It is a cross-sectional view of the utility model;

[0019] Figure 3 for Figure 2 A top view of the second mounting base and the clamping mechanism shown in ;

[0020] Figure 4 is a structural diagram of a first thrust member and a second thrust member;

[0021] Figure 5A top view of another embodiment of the second mounting base and the clamping mechanism. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present utility model, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] Reference Figure 1-5 , a steel strand tensile testing anti-skid clamping device, comprising a hydraulic chuck 10, a first mounting seat 20, a second mounting seat 30, a pushing mechanism 40 and a clamping mechanism 50. The first mounting seat 20 is arranged at the top of the hydraulic chuck 10, and the first mounting seat 20 is provided with a first through hole 21 and a guide structure 22, and the first through hole 21 and the guide structure 22 are both arranged vertically. The second mounting seat 30 is located above the first mounting seat 20, the second mounting seat 30 is slidably connected to the guide structure 22, and the second mounting seat 30 is provided with a second through hole 31 coaxially arranged with the first through hole 21. The pushing mechanism 40 is arranged between the first mounting seat 20 and the second mounting seat 30, and the clamping mechanism 50 is arranged at the top of the second mounting seat 30.

[0027] In the above scheme, the hydraulic chuck 10 is located at the bottom of the tensile testing machine. It is a hydraulic chuck 10 located at the bottom, which is used to clamp the lower end of the steel strand during tensile testing. During operation, the steel strand is first passed through the first through hole 21 and the second through hole 31, and the lower end of the steel strand and the clamp gasket are placed in the hydraulic chuck 10, and the lower end of the steel strand is clamped by the hydraulic chuck 10; then the steel strand is clamped by the clamping mechanism 50 (at this time, a clamp gasket can also be placed between the steel strand and the clamping mechanism 50), and the second mounting seat 30 is driven to move upward relative to the first mounting seat 20 by the pushing mechanism 40, and a certain traction force (generally not more than 10-15KN) is applied to the steel strand, and maintained for a period of time (usually 10-30 seconds), and then the pushing mechanism 40 and the clamping mechanism 50 are unloaded and reset; finally, the upper end of the steel strand is clamped and positioned by the tensile testing machine, and the extensometer is installed to perform tensile testing.

[0028] As shown in the above structure, the steel strand can be clamped by the hydraulic chuck 10 and the clamping mechanism 50, and the second mounting seat 30 can be driven to move upward relative to the first mounting seat 20 through the set pushing mechanism 40, so as to apply a certain traction tension to the steel strand so that the clamp gasket is compressed and deformed to fit the shape of the steel strand and the teeth. The steel strand can be in a stable clamping state, and the steel strand can be prevented from sliding relative to the hydraulic chuck 10 in the initial stage of being pulled by the tensile testing machine, so that the error of data collected in the initial stage of steel strand stretching is reduced, and the effective data collection range during the steel strand tensile detection process is wider.

[0029] Specifically, the guide structure 22 includes a vertically arranged guide column 221 and a spring member 222, the guide column 221 is slidably arranged in the second mounting seat 30, the lower end of the guide column 221 is fixedly connected to the first mounting seat 20, the top of the guide column 221 has a limit head 223, and the spring member 222 is sleeved on the guide column 221 and is located between the limit head 223 and the second mounting seat 30. Through this structure, the movement of the second mounting seat 30 can be guided, and after the push mechanism 40 is reset, the spring member 222 can push the second mounting seat 30 to move downward and reset.

[0030] The hydraulic chuck 10 includes a chuck seat 11, and a leg seat 23 is arranged at the bottom of the first mounting seat 20. The leg seat 23 has a first mating surface 231 abutting against the top surface of the chuck seat 11 and a second mating surface 232 abutting against the side surface of the chuck seat 11. This structure can prevent the second mounting seat 30 from moving laterally relative to the hydraulic chuck 10.

[0031] Furthermore, the leg seat 23 is provided with a mounting hole 233 connected to the second mating surface 232, and the mounting hole 233 is penetrated by a fastening bolt 24, which is inserted and mounted in the chuck seat 11. The first mounting seat 20 can be further positioned by this structure.

[0032] In at least one embodiment, the thrust mechanism 40 includes a first thrust member 41, a second thrust member 42, and a thrust cylinder 43. The first thrust member 41 is fixedly arranged at the bottom of the second mounting seat 30, and the first thrust member 41 has a first downwardly facing guide bevel 411. The second thrust member 42 is slidably arranged at the top of the first mounting seat 20, and the second thrust member 42 has a second guide bevel 421 that contacts and cooperates with the first guide bevel 411. The thrust cylinder 43 is respectively connected to the first mounting seat 20 and the second thrust member 42. The second thrust member 42 is driven to move by the thrust cylinder 43, and the second guide bevel 421 can push the first guide bevel 411, thereby driving the second mounting seat 30 to move upward.

[0033] Among them, the first thrust member 41 and the second thrust member 42 are both U-shaped, and the first through hole 21 is located on the inner side of the first thrust member 41 and the second thrust member 42, the first guide inclined surface 411 is set as two and is respectively arranged at both ends of the first thrust member 41, and the second guide inclined surface 421 is set as two and is respectively arranged at both ends of the second thrust member 42, so that the second mounting seat 30 can be subjected to force more evenly.

[0034] In some embodiments, the first thrust member 41 can be slidably disposed at the bottom of the second mounting seat 30, and the second thrust member 42 can be fixedly disposed at the top of the first mounting seat 20, and the thrust cylinder 43 is connected to the first thrust member 41 and the second mounting seat 30 respectively.

[0035] In at least one embodiment, the clamping mechanism 50 includes a first guide rail 51, a clamping seat 52, a pushing piece 53 and a first clamping cylinder 54. The first guide rail 51 is fixedly arranged on the top of the second mounting seat 30. The clamping seats 52 are provided in two and arranged opposite to each other. The two clamping seats 52 are both slidably arranged on the first guide rail 51. The opposite sides of the two clamping seats 52 have clamping grooves 521. The opposite sides of the two clamping seats 52 have notches 522. The side walls of the notches 522 are provided with second guide rails 523 arranged obliquely with the first guide rail 51. The pushing piece 53 is simultaneously slidably arranged on the two second guide rails 523. The first clamping cylinder 54 is respectively connected to the second mounting seat 30 and the pushing piece 53. The first clamping cylinder 54 drives the pushing piece 53 to move, and through the cooperation between the pushing piece 53 and the second guide rail 523, the two clamping seats 52 can be driven to slide closer along the first guide rail 51, thereby clamping the steel strand; when the pushing piece 53 moves in the opposite direction, the pushing piece 53 can pull the two clamping seats 52 to slide away.

[0036] In at least one embodiment, the clamping mechanism 50 includes a first guide rail 51, a clamping seat 52, and a second clamping oil cylinder 55. The first guide rail 51 is fixedly arranged on the top of the second mounting seat 30. The clamping seats 52 are provided in two and arranged opposite to each other. The two clamping seats 52 are both slidably arranged on the first guide rail 51. The opposite sides of the two clamping seats 52 have clamping grooves 521. The opposite sides of the two clamping seats 52 are each provided with a second clamping oil cylinder 55. The two second clamping oil cylinders 55 are both connected to the second mounting seat 30. The clamping seats 52 are driven to move by the second clamping oil cylinders 55 to change the distance between the two clamping seats 52.

[0037] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A steel strand tensile test anti-slip clamping device, comprising a hydraulic chuck, characterized in that: Also includes: A first mounting seat is arranged on the top of the hydraulic chuck, and the first mounting seat is provided with a first through hole and a guide structure, and the first through hole and the guide structure are both arranged vertically; A second mounting seat is located above the first mounting seat and is slidably connected to the guide structure, and the second mounting seat is provided with a second through hole coaxially arranged with the first through hole; A push mechanism is arranged between the first mounting seat and the second mounting seat; The clamping mechanism is arranged on the top of the second mounting seat.

2. The anti-slip clamping device for steel strand tensile testing according to claim 1 is characterized in that: The guide structure includes a vertically arranged guide column and a spring component. The guide column is slidably inserted into the second mounting seat and fixedly connected to the first mounting seat. The top of the guide column is provided with a limit head. The spring component is sleeved on the guide column between the limit head and the second mounting seat.

3. The anti-slip clamping device for steel strand tensile testing according to claim 1 is characterized in that: The hydraulic chuck comprises a chuck seat, a leg seat is arranged at the bottom of the first mounting seat, and the leg seat has a first matching surface abutting against the top surface of the chuck seat and a second matching surface abutting against the side surface of the chuck seat.

4. The anti-slip clamping device for steel strand tensile testing according to claim 3 is characterized in that: The leg seat is provided with a mounting hole connected to the second matching surface, and a fastening bolt is passed through the mounting hole. The fastening bolt is inserted and mounted in the chuck seat.

5. The anti-slip clamping device for steel strand tensile testing according to claim 1 is characterized in that: The thrust mechanism includes a first thrust member, a second thrust member and a thrust cylinder. The first thrust member is fixedly arranged at the bottom of the second mounting seat and has a first guide inclined surface facing downward. The second thrust member is slidably arranged at the top of the first mounting seat and has a second guide inclined surface contacting and cooperating with the first guide inclined surface. The thrust cylinder is respectively connected to the first mounting seat and the second thrust member.

6. The anti-slip clamping device for steel strand tensile testing according to claim 5 is characterized in that: The first thrust member and the second thrust member are both U-shaped, and the first through hole is located on the inner sides of the first thrust member and the second thrust member, two first guide bevels are provided and are respectively provided at both ends of the first thrust member, and two second guide bevels are provided and are respectively provided at both ends of the second thrust member.

7. The anti-slip clamping device for steel strand tensile testing according to claim 1 is characterized in that: The clamping mechanism includes a first guide rail, a clamping seat, a pushing piece and a first clamping cylinder. The first guide rail is fixedly arranged on the top of the second mounting seat. The clamping seats are provided in two and arranged opposite to each other. The two clamping seats are both slidably arranged on the first guide rail. The opposite sides of the two clamping seats are provided with clamping grooves. The opposite sides of the two clamping seats are provided with notches. The side walls of the notch are provided with second guide rails arranged obliquely with the first guide rail. The pushing piece is slidably arranged on the two second guide rails at the same time. The first clamping cylinder is respectively connected to the second mounting seat and the pushing piece.

8. The anti-slip clamping device for steel strand tensile testing according to claim 1 is characterized in that: The clamping mechanism includes a first guide rail, a clamping seat and a second clamping cylinder. The first guide rail is fixed on the top of the second mounting seat. The clamping seats are provided in two and arranged opposite to each other. Both clamping seats are slidably provided on the first guide rail. Both opposite sides of the two clamping seats have clamping grooves. A second clamping cylinder is provided on each of the opposite sides of the two clamping seats. Both second clamping cylinders are connected to the second mounting seat.

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