Construction engineering reinforcing steel bar quality detection device

Abstract

The invention relates to a constructional engineering steel bar quality detection device which comprises a detection tool, an outer cover, an external expansion table and an X-axis mechanism. An outer cover is hinged to the detection tool, an external expansion table is installed on one side of the detection tool, the X-axis mechanism is installed on the external expansion table during telescopic movement, a bearing table is arranged in the detection tool, a two-way lead screw is hinged to the bearing table, a pair of telescopic arms is connected to the two-way lead screw in a threaded mode, and the two-way lead screw is connected with the telescopic arms in a threaded mode. And limiting seats are arranged on the opposite surfaces of the telescopic arms. According to the constructional engineering reinforcing steel bar quality detection device, through meshing transmission of the first conical part and the second conical part, the linkage column drives the multiple sets of transmission lead screws to rotate synchronously, it is ensured that all the telescopic tables are in equidistant linkage, it is ensured that the axis of a reinforcing steel bar coincides with the axis of a circular ring, and therefore the accuracy of a detection result is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel bar quality detection, in particular to a steel bar quality detection device for construction engineering. Background Art

[0002] When using steel bars, the quality of the bent steel bars must first be inspected to avoid partial defects that affect the stability of the steel bars during application. Then the steel bar restriction mechanism has poor adaptability and cannot quickly adapt to the ends of steel bars with different diameters. The manual adjustment efficiency is low. Mechanical vibration during the detection process can easily cause the fixture to loosen, resulting in the displacement of the steel bar position. In view of this, a device for detecting the quality of steel bars in construction projects is proposed. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the following technical problems in the prior art: the restricting mechanism of the steel bar has poor adaptability and cannot quickly adapt to the ends of steel bars of different diameters; the manual adjustment efficiency is low; and the mechanical vibration during the detection process can easily cause the clamp to loosen, resulting in the displacement of the steel bar position.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a construction engineering steel bar quality detection device, comprising a detection tool, an outer cover, an outer expansion table and an X-axis mechanism; The detection tooling is hinged with an outer cover, one side of the detection tooling is provided with an outward expansion platform, the X-axis mechanism is provided on the outward expansion platform during telescopic movement, a bearing platform is provided in the detection tooling, a bidirectional lead screw is hinged in the bearing platform, a pair of telescopic arms are threadedly connected to the bidirectional lead screw, and a limiting seat is provided on the opposite surface of the telescopic arms; A circular ring is provided on the support platform for telescopic movement, and a scanner is installed in the circular ring; The limiting seat has a plurality of forked parts, a space one is milled in the forked parts of the plurality of limiting seats, a space two is reserved in the center of the limiting seat, a plurality of the spaces one are distributed in an array outside the space two, a linkage column is hingedly installed in the space two of the limiting seat, a transmission screw is hinged in the space one of the plurality of limiting seats, and a plurality of the transmission screws extend into the space two toward the linkage column, a telescopic table is correspondingly installed at the positions of the plurality of spaces one of the limiting seat, the telescopic table is on the circumference of the transmission screw, and the telescopic table is in a telescopic motion relationship on the limiting seat, a T-seat is fixedly connected to the outer contour of the forked part of any of the limiting seats, and a linkage cover is hingedly installed on a side of the T-seat deviating from the limiting seat.

[0006] As a preferred technical solution for a steel bar quality inspection device for construction projects, a round seat is arranged in the T-seat, and the round seat is connected to a transmission screw at a corresponding position. A magnet and an elastic member are telescopically mounted on a side of the round seat that deviates from the transmission screw, and the edge of the magnet that deviates from the round seat is embedded in the T-seat.

[0007] As an optimal technical solution for a steel bar quality inspection device for construction projects, two magnets are installed in the linkage cover, and a limiting hoop is installed on the T-seat, and the limiting hoop deviates from the side of the T-seat and is opposite to the linkage cover.

[0008] As an optimal technical solution for a steel bar quality inspection device for construction projects, a threaded channel is reserved on the telescopic table, and the telescopic table and the transmission screw form a threaded transmission through the threaded channel. A long channel is reserved on the surface of the limiting seat, and the long channel is connected with the space. An extension arm is installed on the telescopic table, and the extension arm telescopes in the long channel.

[0009] As a preferred technical solution for a steel bar quality inspection device for construction projects, a plurality of tapered parts are installed at the positions where the transmission screws extend into space one, a tapered part one is fixedly connected to the circumferential surface of the linkage column, and the tapered part one and the tapered part two are engaged for transmission, and a disc is installed at the other forked portion of the limiting seat, and the disc is connected to the corresponding transmission screw.

[0010] As a preferred technical solution for a steel bar quality inspection device for construction projects, an annular space is milled in the T-seat, the round seat is hinged in the annular space, a spline channel is reserved at the axis of the round seat, a spline shaft is installed at the position where the transmission screw extends out of the limiting seat, and the spline channel is engaged with the spline shaft at its corresponding position.

[0011] As an optimal technical solution for a steel bar quality inspection device for construction projects, a side of the round seat deviating from the transmission screw is milled with a plurality of circular openings in an array, the inner edge of the annular space is milled with annular openings with the same number as the circular openings, the overall distance of the magnet is larger than the spacing of the annular openings, the magnet telescopes in the circular opening, the elastic member is arranged between the portion where the magnet extends into the circular opening and the inner edge of the circular opening, and the magnet is engaged with the annular opening.

[0012] As an optimal technical solution for a steel bar quality inspection device for construction projects, the linkage cover is provided with two circular openings on one side facing the T-seat, the same number as the annular openings, the magnet two is located in the circular openings, the opposite surfaces of the magnet one and the magnet two are both S poles, a pair of opening marks and closing marks are installed on the T-seat, the pair of opening marks and closing marks are alternately distributed at equal angles, and a display opening is milled on the linkage cover.

[0013] As an optimal technical solution for a steel bar quality inspection device for construction projects, the limiting circular hoop telescopically moves on a T-seat, a circumferential surface of the T-seat is milled with a plurality of linear grooves distributed in an array, an inner edge of the limiting circular hoop is provided with a plurality of traction platforms distributed in an array, the number of the traction platforms is the same as the number of the linear grooves, the traction platforms telescopically move in the linear grooves, and a plurality of trapezoidal platforms distributed in an array are provided on the side of the limiting circular hoop facing the linkage cover.

[0014] As a preferred technical solution for a steel bar quality inspection device for construction projects, the linkage cover is milled with a plurality of trapezoidal openings distributed in an array on one side facing the transmission screw, the trapezoidal platform and the trapezoidal openings are installed in the same number, the trapezoidal platform and the trapezoidal openings are paired, and two elastic parts are installed between the limiting hoop and the T-seat, and the two elastic parts are located on the circumferential surface of the T-seat.

[0015] Beneficial effects of the present invention: The steel bar quality inspection device for construction projects realizes the synchronous rotation of multiple transmission screws driven by the linkage column through the engagement transmission of the first cone and the second cone, ensures that all telescopic tables are equidistantly linked, and ensures that the axis of the steel bar coincides with the axis of the ring, thereby improving the accuracy of the inspection result; The steel bar quality inspection device for construction projects uses a magnet and an elastic member of the annular opening to automatically lock the round seat after adjustment is completed to prevent the transmission screw from rotating and loosening, so that the steel bar axis can always maintain the position state after being determined, so that the data of each point of the steel bar can be inspected with the highest accuracy; The steel bar quality inspection device for construction projects realizes double limitation of the linkage cover state by meshing the trapezoidal platform with the trapezoidal mouth and the second elastic member, thereby assisting in improving the ability of the steel bar axis to maintain the position state after being determined.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the interior of the detection tooling of the present invention.

[0019] Figure 3 It is a schematic diagram of the limiting seat structure of the present invention.

[0020] Figure 4 The present invention is based on Figure 2 Explosion diagram.

[0021] Figure 5 It is a schematic diagram of a T-seat of the present invention.

[0022] Figure 6 The present invention is based on Figure 5 Explosion diagram.

[0023] Figure 7 It is a schematic cross-sectional view of the T-seat of the present invention.

[0024] Figure 8 The present invention is based on Figure 7 Schematic diagram from another perspective after the round base is hidden.

[0025] Fig. 9 It is a schematic diagram of a round seat of the present invention.

[0026] Fig.10 It is a schematic diagram of the back of the linkage cover of the present invention.

[0027] Fig.11 It is a schematic diagram of the connection between the telescopic arm and the bidirectional lead screw of the present invention.

[0028] Reference numerals: 20. Inspection tooling; 21. Cover; 22. Expansion table; 23. X-axis mechanism; 24. Carrying table; 25. Telescopic arm; 26. Ring; 27. Scanner; 28. Bidirectional screw; 30. Limit seat; 31. Long channel; 32. Linkage column; 33. Conical part 1; 34. Transmission screw; 35. Disc; 36. Spline shaft; 37. Conical part 2; 38. Telescopic table; 39. Silk channel; 40. Extension arm; 4 1. T-seat; 42. annular space; 43. annular opening; 44. straight groove; 45. opening mark; 46. closing mark; 47. round seat; 48. spline channel; 49. round opening one; 50. magnet one; 51. elastic part one; 52. linkage cover; 53. display opening; 54. round opening two; 55. trapezoidal opening; 56. magnet two; 57. limiting hoop; 58. traction table; 59. trapezoidal table; 60. elastic part two. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] Example, see Figure 1 , 2 and 11, a construction engineering steel bar quality inspection device, comprising an inspection tool 20, an outer cover 21, an expansion platform 22 and an X-axis mechanism 23; An outer cover 21 is hinged on the detection tool 20, wherein the outer cover 21 is used to block dust during the detection operation in the detection tool 20. An expansion platform 22 is installed on one side of the detection tool 20, wherein the expansion platform 22 can be used to store daily tools, and the expansion platform 22 guides the movement of the X-axis mechanism 23. The X-axis mechanism 23 is installed on the expansion platform 22 during telescopic movement. A bearing platform 24 is configured in the detection tool 20, and a bidirectional lead screw 28 is hinged in the bearing platform 24. A pair of telescopic arms 25 are threaded on the bidirectional lead screw 28, and a limiting seat 30 is installed on the opposite surface of the telescopic arms 25; A ring 26 is telescopically provided on the carrier 24, wherein the ring 26 is linked to the X-axis mechanism 23 through a bracket, and this structure is the existing X-axis transmission belt linkage, and a scanner 27 is installed in the ring 26, wherein the ring 26 wraps the steel bar, and the scanner 27 is used to detect the surface of the steel bar during the telescopic movement of the ring 26; Reference Figure 3 , 5 , 7 and 9, the limiting seat 30 has a plurality of forked parts, a space one is milled in the forked parts of the plurality of limiting seats 30, a space two is reserved in the center of the limiting seat 30, a plurality of spaces one are distributed outside the space two in an array, a linkage column 32 is hingedly installed in the space two of the limiting seat 30, a transmission screw 34 is hingedly installed in the space one of the plurality of limiting seats 30, and a plurality of transmission screws 34 extend into the space two toward the position of the linkage column 32, and a telescopic platform 38 is correspondingly installed at the position of the plurality of spaces one of the limiting seat 30, and the telescopic platform 38 is on the circumference of the transmission screw 34, and the telescopic platform 38 is on the limiting seat 30 The telescopic motion relationship is that a T seat 41 is fixedly connected to the outer contour of the forked portion of any limiting seat 30, and a round seat 47 is arranged in the T seat 41. The round seat 47 is connected with the driving screw 34 at the corresponding position. A magnet 50 and an elastic member 51 are telescopically arranged on the side of the round seat 47 deviating from the driving screw 34, and the edge of the magnet 50 deviating from the round seat 47 is embedded with the T seat 41; a linkage cover 52 is hingedly arranged on the side of the T seat 41 deviating from the limiting seat 30, and a magnet 2 56 is arranged in the linkage cover 52, and a limiting hoop 57 is arranged on the T seat 41, and the side of the limiting hoop 57 deviating from the T seat 41 is opposite to the linkage cover 52; Reference Figure 4A threaded channel 39 is reserved on the telescopic platform 38, and the telescopic platform 38 and the transmission screw 34 form a threaded transmission through the threaded channel 39. A long channel 31 is reserved on the surface of the limiting seat 30, and the long channel 31 is connected with the space one. An extension arm 40 is installed on the telescopic platform 38, and the extension arm 40 telescopically moves in the long channel 31. A plurality of transmission screws 34 are extended into the space one and are provided with a conical member 2 37. The circumferential surface of the linkage column 32 is fixedly connected with a conical member 1 33, and the conical member 1 33 and the conical member 2 37 are engaged for transmission. A disc 35 is installed on the other fork of the limiting seat 30, and the disc 35 is connected with the corresponding transmission screw 34. The movable screw 34 is connected, and the engagement transmission relationship between the conical member 1 33 and the conical member 2 37 is relied on, so that several drive screws 34 can rotate together. After one end of the steel bar is docked on the limiting seat 30, the disc 35 is rotated, so that the corresponding drive screw 34 can be linked with the telescopic platform 38 to perform telescopic movement. The corresponding conical member 2 37 engages with the conical member 1 33 to make the linkage column 32 rotate. At the same time, the conical member 1 33 rotates and links the remaining conical members 2 37 to rotate, so that several telescopic platforms 38 move relatively together, so as to limit the ends of steel bars of different specifications. Reference Figure 8 and 9 An annular space 42 is milled in the T seat 41, and the round seat 47 is hinged in the annular space 42. A spline channel 48 is reserved at the axis of the round seat 47. A spline shaft 36 is installed at the position where the transmission screw 34 extends out of the limiting seat 30. The spline channel 48 is connected with the spline shaft 36 at its corresponding position in a chimeric manner. A side of the round seat 47 deviating from the transmission screw 34 is milled with a plurality of round openings 49 in an array manner. The inner edge of the annular space 42 is milled with annular openings 43 with the same number as the round openings 49. The overall distance of the magnet 50 is larger than the spacing of the annular openings 43. The magnet 50 telescopically moves in the round opening 49. The elastic member 51 is installed between the position where the magnet 50 extends into the round opening 49 and the inner edge of the round opening 49. The magnet 50 is chimerically connected with the annular opening 43. Reference Figure 6 and 10, the linkage cover 52 is provided with a circular opening 54 with the same number as the annular opening 43 on one side facing the T seat 41, the magnet 2 56 is in the circular opening 54, the opposite surfaces of the magnet 1 50 and the magnet 2 56 are both S poles, a pair of opening marks 45 and a closing mark 46 are arranged on the T seat 41, and the pair of opening marks 45 and the closing marks 46 are alternately distributed at equal angles, and a display opening 53 is milled on the linkage cover 52. When the transmission screw 34 is rotated, the linkage cover 52 is rotated so that the display opening 53 corresponds to the position of the opening mark 45. At the same time, the magnet 2 56 is opposite to the annular opening 43. Under the characteristic that the opposite surfaces of the magnet 2 56 and the annular opening 43 are both S poles, the magnet 1 50 will be moved toward the depth of the circular opening 49 by the action, and the elastic member 1 51 is squeezed at this moment, and the magnet 1 50 is no longer embedded in the annular opening 43. The round seat 47 in the engraved state can be linked with the transmission screw 34 for rotating motion. After the state of the telescopic table 38 is adjusted by relying on the transmission screw 34, and in the fine-tuning state, the round mouth 49 is opposite to the annular mouth 43, and the linkage cover 52 is rotated to make the display mouth 53 face the closing mark 46. At this time, the magnet 2 56 is misaligned with the annular mouth 43. Under the action of the elastic member 1 51, the magnet 1 50 can be embedded in the annular mouth 43. At this time, the round seat 47 cannot be rotated due to the limitation of the magnet 1 50. The round seat 47 directly limits the state of the transmission screw 34 under the characteristics of the spline channel 48, so as to avoid the transmission screw 34 being caused by the shaking factor to cause the telescopic table 38 to produce position deviation, so that when the steel bar is undergoing quality inspection, its axis and the axis of the limiting seat 30 are highly overlapped, thereby improving the accuracy of the inspection result.

[0034] Reference Figure 5 and 6, the limiting hoop 57 is telescopically movable on the T seat 41, and a plurality of linear grooves 44 distributed in an array are milled on the circumference of the T seat 41, and a plurality of traction platforms 58 distributed in an array are installed on the inner edge of the limiting hoop 57, and the number of traction platforms 58 and the linear groove 44 installed is the same, and the traction platform 58 is telescopically movable in the linear groove 44, and a plurality of trapezoidal platforms 59 distributed in an array are installed on the side of the limiting hoop 57 facing the linkage cover 52, and a plurality of trapezoidal openings 55 distributed in an array are milled on the side of the linkage cover 52 facing the transmission screw 34, and the number of trapezoidal platforms 59 and the trapezoidal openings 55 installed is the same, and the trapezoidal platforms 59 is paired with the trapezoidal mouth 55, and an elastic member 60 is installed between the limiting hoop 57 and the T-seat 41. The elastic member 60 is located on the circumferential surface of the T-seat 41. The traction platform 58 telescopically moves on the straight groove 44 to guide the limiting hoop 57 when its position changes. When the display port 53 is facing the opening mark 45 and the closing mark 46, under the action of the elastic member 60, the limiting hoop 57 will be linked to move toward the position of the linkage cover 52, and the trapezoidal mouth 55 is located in the trapezoidal platform 59. At this time, the state of the linkage cover 52 can be limited, thereby improving the stability of the transmission screw 34 after being limited or unlimited.

[0035] Through the above content, it can be achieved that: the outer cover 21 is opened, the ring 26 and the telescopic arm 25 are adjusted to the edge position, and then the steel bar is placed between a pair of limiting seats 30, and under the action of the bidirectional lead screw 28, the pair of telescopic arms 25 are relatively moved to adapt to the use of steel bars of different lengths, one end of the steel bar is matched to the limiting seat 30, and the linkage cover 52 is rotated until the display opening 53 is opposite to the opening mark 45. At this time, the second magnet 56 will also move to the position opposite to the annular opening 43. Under the characteristics that the opposite surfaces of the second magnet 56 and the annular opening 43 are both S poles, the first magnet 50 will be By moving toward the depth of the circular opening 49, the elastic member 51 is squeezed at this moment, and the magnet 50 is no longer embedded in the annular opening 43. At this moment, the round seat 47 can be linked with the transmission screw 34 to perform a rotary motion. The disc 35 is rotated so that the corresponding transmission screw 34 can be linked with the telescopic platform 38 to perform a telescopic motion. When the corresponding conical member 2 37 bites the conical member 1 33, the linkage column 32 rotates. At the same time, the conical member 1 33 rotates and links the remaining conical members 2 37 to rotate, so that a plurality of telescopic platforms 38 move relatively together, so as to adjust the ends of steel bars of different specifications. After the extension arms 40 restrict the steel bars and make fine adjustments, the linkage cover 52 is rotated to make the display opening 53 face the closed mark 46. At this time, the magnet 2 56 is misaligned with the annular opening 43, and the round opening 1 49 faces the annular opening 43. Under the action of the elastic member 1 51, the magnet 1 50 can be embedded in the annular opening 43. At this time, the round seat 47 cannot be rotated due to the restriction of the magnet 1 50. The round seat 47 directly restricts the state of the transmission screw 34 under the characteristics of the spline channel 48, so as to avoid the transmission screw 34 being shaken and causing the telescopic table 38 to produce a position. The deviation makes the axis center of the steel bar and the axis center of the limiting seat 30 highly coincide with each other during the quality inspection, thereby improving the accuracy of the inspection result, and the ring 26 is controlled to perform telescopic movement. At this time, the scanner 27 detects the surface of the steel bar along with the ring 26. When the display port 53 is facing the opening mark 45 and the closing mark 46, under the action of the elastic member 60, the limiting hoop 57 will be linked to move toward the position of the linkage cover 52, and the trapezoidal port 55 is in the trapezoidal platform 59. At this time, the state of the linkage cover 52 can be limited, thereby improving the stability of the transmission screw 34 after being limited or unlimited.

[0036] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, without undue experimentation, the development effort will be a routine task of design, fabrication, and production.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A construction engineering steel bar quality detection device, characterized in that: It includes inspection tooling, outer cover, expansion table and X-axis mechanism; The detection tooling is provided with a bearing platform, a bidirectional lead screw is hinged in the bearing platform, a pair of telescopic arms are threadedly connected to the bidirectional lead screw, and limiting seats are installed on opposite surfaces of the telescopic arms; A circular ring is provided on the support platform for telescopic movement, and a scanner is installed in the circular ring; The limiting seat has a plurality of forked parts, a space one is milled in the forked parts of the plurality of limiting seats, a space two is reserved in the center of the limiting seat, a plurality of the spaces one are distributed in an array outside the space two, a linkage column is hingedly installed in the space two of the limiting seat, a transmission screw is hinged in the space one of the plurality of limiting seats, and a plurality of the transmission screws extend into the space two toward the linkage column, a telescopic table is correspondingly installed at the positions of the plurality of spaces one of the limiting seat, the telescopic table is on the circumference of the transmission screw, and the telescopic table is in a telescopic motion relationship on the limiting seat, a T-seat is fixedly connected to the outer contour of the forked part of any of the limiting seats, and a linkage cover is hingedly installed on a side of the T-seat deviating from the limiting seat.

2. The construction engineering steel bar quality detection device according to claim 1, characterized in that: An outer cover is hinged on the detection tooling, and an expansion platform is installed on one side of the detection tooling. The X-axis mechanism is installed on the expansion platform during telescopic movement. A round seat is arranged in the T-seat, and the round seat is connected with a transmission screw at a corresponding position. A magnet and an elastic member are telescopically installed on one side of the round seat deviating from the transmission screw, and the edge of the magnet deviating from the round seat is embedded with the T-seat.

3. The construction engineering steel bar quality detection device according to claim 1, characterized in that: A second magnet is arranged in the linkage cover, and a limiting hoop is arranged on the T seat. The limiting hoop deviates from the side of the T seat and is opposite to the linkage cover.

4. The construction engineering steel bar quality detection device according to claim 1, characterized in that: A threaded channel is reserved on the telescopic platform, and the telescopic platform and the transmission screw form a threaded transmission through the threaded channel. A long channel is reserved on the surface of the limiting seat, and the long channel is connected with the space. An extension arm is installed on the telescopic platform, and the extension arm telescopes in the long channel.

5. The construction engineering steel bar quality detection device according to claim 1, characterized in that: Conical part 2 is installed at the position where several of the transmission screws extend into space 1, and the circumferential surface of the linkage column is fixedly connected with the conical part 1. The outer circumference of the conical part 1 and the conical part 2 is milled with array-distributed tooth groove patterns, and the conical part 1 and the conical part 2 are engaged for transmission. A disc is installed at the other fork part of the limiting seat, and the disc is connected with the corresponding transmission screw.

6. The construction engineering steel bar quality detection device according to claim 2, characterized in that: An annular space is milled in the T-seat, the round seat is hinged in the annular space, a spline channel is reserved at the axis of the round seat, a spline shaft is installed at the position where the transmission screw extends out of the limiting seat, the spline channel is engaged with the spline shaft at its corresponding position, and a plurality of round openings are milled in an array on one side of the round seat that deviates from the transmission screw.

7. The construction engineering steel bar quality detection device according to claim 6, characterized in that: The inner edge of the annular space is milled with annular openings of the same number as the circular openings. The overall distance of the magnet is larger than the spacing of the annular openings. The magnet telescopes in the circular opening. The elastic member is arranged between the portion where the magnet extends into the circular opening and the inner edge of the circular opening. The magnet is engaged with the annular opening.

8. The construction engineering steel bar quality detection device according to claim 3, characterized in that: The side of the linkage cover facing the T-seat is reserved with two circular openings, the same number as the annular openings, the second magnet is located in the second circular opening, the opposite surfaces of the second magnet and the first magnet are both S poles, a pair of opening marks and a closing mark are installed on the T-seat, the pair of opening marks and closing marks are alternately distributed at equal angles, and a display opening is milled on the linkage cover.

9. The construction engineering steel bar quality detection device according to claim 3, characterized in that: The limiting circular hoop telescopically moves on the T-seat, and a plurality of linear grooves distributed in an array are milled on the circumferential surface of the T-seat. A plurality of traction platforms distributed in an array are installed on the inner edge of the limiting circular hoop. The number of the traction platforms is the same as the number of the linear grooves. The traction platforms telescopically move in the linear grooves, and a plurality of trapezoidal platforms distributed in an array are installed on the side of the limiting circular hoop facing the linkage cover.

10. The construction engineering steel bar quality detection device according to claim 9, characterized in that: A plurality of trapezoidal openings distributed in an array are milled on one side of the linkage cover facing the transmission screw, the trapezoidal platform and the trapezoidal openings are installed in the same number, the trapezoidal platform and the trapezoidal openings are paired, and two elastic parts are installed between the limiting hoop and the T-seat, and the two elastic parts are located on the circumferential surface of the T-seat.

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