A device for detecting the quality of steel bars in construction engineering

Abstract

The present invention relates to a device for detecting the quality of steel bars in construction engineering, which includes a detection tooling, an outer cover, an outer expansion table and an X-axis mechanism; the outer cover is hinged to the detection tooling, an outer expansion table is arranged on one side of the detection tooling, the X-axis mechanism is arranged on the outer expansion table during telescopic movement, a bearing table is configured in the detection tooling, a bidirectional lead screw is hinged in the bearing table, a pair of telescopic arms are screwed on the bidirectional lead screw, and a limiting seat is arranged on the opposite surface of the telescopic arms. This device for detecting the quality of steel bars in construction engineering realizes the synchronous rotation of multiple groups of transmission lead screws driven by the linkage column through the engagement transmission of the first conical part and the second conical part, ensures the equidistant linkage of all telescopic tables, and guarantees the coincidence of the axis of the steel bar and the axis of the ring, thereby improving the accuracy of the detection result.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel bar quality inspection, and specifically relates to a steel bar quality inspection device for construction projects. Background Art

[0002] When steel bars are applied, it is first necessary to conduct quality inspections on the bent steel bars to avoid the influence of completely or partially defective positions on the stability of the steel bars during application.

[0003] Then, the limiting mechanism of the steel bar has poor adaptability, cannot quickly adapt to the ends of steel bars with different diameters, has low manual adjustment efficiency, and mechanical vibration during the inspection process easily causes the fixture to loosen, resulting in the displacement of the steel bar position.

[0004] In view of this, a steel bar quality inspection device for construction projects is proposed. Summary of the Invention

[0005] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title. However, such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the following technical problems existing in the prior art: Then, the limiting mechanism of the steel bar has poor adaptability, cannot quickly adapt to the ends of steel bars with different diameters, has low manual adjustment efficiency, and mechanical vibration during the inspection process easily causes the fixture to loosen, resulting in the displacement of the steel bar position.

[0007] To solve the above technical problems, the present invention provides the following technical solution: A steel bar quality inspection device for construction projects, including an inspection tooling, an outer cover, an outer expansion table, and an X-axis mechanism;

[0008] The outer cover is hinged to the inspection tooling, the outer expansion table is arranged on one side of the inspection tooling, the X-axis mechanism is arranged on the outer expansion table during telescopic movement, a bearing table is configured in the inspection tooling, a bidirectional lead screw is hinged in the bearing table, a pair of telescopic arms are threaded on the bidirectional lead screw, and a limiting seat is arranged on the opposite surface of the telescopic arms;

[0009] A ring moves telescopically on the bearing table, and a scanner is arranged in the ring;

[0010] The limiting seat has a number of bifurcated parts. A space one is milled in the bifurcated parts of a number of the limiting seats. A space two is reserved at the center of the limiting seat. A number of the space ones are distributed in an array outside the space two. A linkage column is articulated and installed in the space two of the limiting seat. A transmission lead screw is articulated in each of the space ones of a number of the limiting seats. The parts of a number of the transmission lead screws that commonly face the linkage column extend into the space two. A telescopic platform is correspondingly installed at each position of a number of the space ones of the limiting seat. The telescopic platform is on the peripheral surface of the transmission lead screw. The telescopic platform has a telescopic movement relationship with the limiting seat. A T-seat is fixedly connected to the outer contour of the bifurcated part of any one of the limiting seats. A linkage cover is articulated and installed on the side of the T-seat that deviates from the limiting seat.

[0011] As a preferred technical solution of a steel bar quality detection device for construction engineering, a round seat is arranged in the T-seat. The round seat is connected to the transmission lead screw at the corresponding position. A magnet one and an elastic part one are installed in a telescopic movement manner on the side of the round seat that deviates from the transmission lead screw. The side of the magnet one that deviates from the round seat is fitted with the T-seat.

[0012] As a preferred technical solution of a steel bar quality detection device for construction engineering, a magnet two is installed in the linkage cover. A limiting circular hoop is installed on the T-seat. The side of the limiting circular hoop that deviates from the T-seat faces the linkage cover.

[0013] As a preferred technical solution of a steel bar quality detection device for construction engineering, a thread channel is reserved on the telescopic platform. The telescopic platform forms a threaded connection and transmission with the transmission lead screw through the thread channel. A long strip channel is reserved on the surface of the limiting seat. The long strip channel communicates with the space one. An extension arm is installed on the telescopic platform. The extension arm makes a telescopic movement in the long strip channel.

[0014] As a preferred technical solution of a steel bar quality detection device for construction engineering, a conical part two is installed at the part where a number of the transmission lead screws extend into the space one. A conical part one is fixedly connected to the peripheral surface of the linkage column. The conical part one and the conical part two are engaged in transmission. A disc is installed on another bifurcated part of the limiting seat. The disc is connected to the corresponding transmission lead screw.

[0015] As a preferred technical solution of a steel bar quality detection device for construction engineering, an annular space is milled in the T-seat. The round seat is articulated in the annular space. A spline channel is reserved at the axis center of the round seat. A spline shaft is installed at the part where the transmission lead screw extends out of the limiting seat. The spline channel is in an embedded connection with the spline shaft at the corresponding position.

[0016] As a preferred technical solution of a steel bar quality detection device for construction engineering, a plurality of first round openings are milled in an array on the side of the round base deviating from the transmission lead screw. An annular opening with the same number as the first round openings is milled along the inner edge of the annular space. The overall distance of the first magnet is larger than the distance between the annular openings. The first magnet moves telescopically in the first round openings. The first elastic member is arranged between the part of the first magnet extending into the first round opening and the inner edge of the first round opening. The first magnet is in a fitting connection with the annular opening.

[0017] As a preferred technical solution of a steel bar quality detection device for construction engineering, a plurality of second round openings with the same number as the annular openings are reserved on the side of the linkage cover facing the T seat. The second magnet is located in the second round openings. The opposite surfaces of the first magnet and the second magnet are both S poles. A pair of opening marks and closing marks are arranged on the T seat. The pair of opening marks and closing marks are alternately distributed at equal angles. A display opening is milled on the linkage cover.

[0018] As a preferred technical solution of a steel bar quality detection device for construction engineering, the limiting circular hoop moves telescopically on the T seat. A plurality of linear grooves are milled in an array on the circumferential surface of the T seat. A plurality of traction platforms are arranged in an array on the inner edge of the limiting circular hoop. The number of the traction platforms is the same as that of the linear grooves. The traction platforms move telescopically in the linear grooves. A plurality of trapezoidal platforms are arranged in an array on the side of the limiting circular hoop facing the linkage cover.

[0019] As a preferred technical solution of a steel bar quality detection device for construction engineering, a plurality of trapezoidal openings are milled in an array on the side of the linkage cover facing the transmission lead screw. The number of the trapezoidal platforms is the same as that of the trapezoidal openings. The trapezoidal platforms are paired with the trapezoidal openings. A second elastic member is arranged between the limiting circular hoop and the T seat. The second elastic member is located on the circumferential surface of the T seat.

[0020] Advantages of the present invention:

[0021] Through the meshing transmission of the first conical member and the second conical member, this steel bar quality detection device for construction engineering realizes the synchronous rotation of multiple transmission lead screws driven by the linkage column, ensures the equidistant linkage of all telescopic platforms, and guarantees the coincidence of the axis of the steel bar and the axis of the circular ring, thereby improving the accuracy of the detection result;

[0022] Through the fitting of the first magnet and the annular opening and the first elastic member, this steel bar quality detection device for construction engineering automatically locks the round base after the adjustment is completed, preventing the transmission lead screw from rotating back and loosening, so that the axis of the steel bar can always maintain this position state after being determined, thereby enabling the data of each point of the steel bar to be detected with the highest accuracy;

[0023] The steel bar quality detection device for this construction project realizes the dual limitation of the linkage cover state through the meshing of the trapezoidal platform and the trapezoidal opening with the elastic member II, thereby assisting in ensuring that the steel bar axis can always maintain its position state after being determined.

[0024] Other features and advantages of the present invention will be described in the subsequent description, and in part, will become apparent from the description or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 It is a schematic diagram of the interior of the detection tooling of the present invention.

[0028] Figure 3 It is a schematic diagram of the structure of the limiting seat of the present invention.

[0029] Figure 4 For the present invention based on Figure 2 Explosion schematic diagram.

[0030] Figure 5 It is a schematic diagram of the T-seat of the present invention.

[0031] Figure 6 For the present invention based on Figure 5 Explosion schematic diagram.

[0032] Figure 7 It is a sectional view of the T-seat of the present invention.

[0033] Figure 8 For the present invention based on Figure 7 Another perspective schematic diagram after the circular seat is hidden.

[0034] Figure 9 It is a schematic diagram of the circular seat of the present invention.

[0035] Figure 10 It is a schematic diagram of the back of the linkage cover of the present invention.

[0036] Figure 11 It is a schematic diagram of the connection between the telescopic arm and the bidirectional lead screw of the present invention.

[0037] Reference Numerals:

[0038] 20. Detection tooling; 21. Outer cover; 22. Outer expansion table; 23. X-axis mechanism; 24. Bearing table; 25. Telescopic arm; 26. Ring; 27. Scanner; 28. Bi-directional lead screw; 30. Restriction seat; 31. Long strip channel; 32. Linkage column; 33. First tapered part; 34. Transmission lead screw; 35. Disc; 36. Spline shaft; 37. Second tapered part; 38. Telescopic table; 39. Thread pattern channel; 40. Extension arm; 41. T-seat; 42. Annular space; 43. Annular opening; 44. Linear groove; 45. Opening mark; 46. Closing mark; 47. Round seat; 48. Spline channel; 49. First round opening; 50. First magnet; 51. First elastic part; 52. Linkage cover; 53. Display opening; 54. Second round opening; 55. Trapezoidal opening; 56. Second magnet; 57. Restriction hoop; 58. Traction table; 59. Trapezoidal table; 60. Second elastic part. Detailed Embodiment

[0039] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings of the specification.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0041] Secondly, the so-called "one embodiment" or "embodiment" herein refers to specific features, structures, or characteristics that can be included in at least one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or selectively exclusive embodiments from other embodiments.

[0042] Furthermore, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally not in accordance with the general ratio, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0043] Embodiment, referring to Figure 1 、 2 and 11, a device for detecting the quality of steel bars in construction engineering, including a detection tooling 20, an outer cover 21, an outer expansion table 22, and an X-axis mechanism 23;

[0044] A cover 21 is hinged to the detection tooling 20. The cover 21 is used to prevent dust from entering the detection operation in the detection tooling 20 on a daily basis. An outward extension platform 22 is arranged on one side of the detection tooling 20. The outward extension platform 22 can be used to store daily tools, and the outward extension platform 22 guides the movement of the X-axis mechanism 23. When the X-axis mechanism 23 moves telescopically, it is arranged on the outward extension platform 22. A bearing platform 24 is configured in the detection tooling 20. 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. A limiting seat 30 is arranged on the opposite surface of the telescopic arms 25;

[0045] A ring 26 moves telescopically on the bearing platform 24. The ring 26 is linked by the X-axis mechanism 23 through a bracket. This structure is the existing X-axis conveyor belt linkage. A scanner 27 is arranged in the ring 26. The ring 26 wraps the steel bar. During the telescopic movement of the ring 26, the scanner 27 is used to detect the surface of the steel bar;

[0046] Refer to Figure 3 、 5 、7 and 9, the limiting seat 30 has several bifurcated parts. A space one is milled in the bifurcated parts of several limiting seats 30. A space two is reserved in the middle of the limiting seat 30. Several space ones are arranged in an array outside the space two. A linkage column 32 is hingedly arranged in the space two of the limiting seat 30. A transmission lead screw 34 is hinged in each of the space ones of several limiting seats 30. The parts of several transmission lead screws 34 that jointly face the linkage column 32 extend into the space two. Telescopic platforms 38 are arranged at corresponding positions of several space ones of the limiting seat 30. The telescopic platforms 38 are located on the circumferential surface of the transmission lead screw 34. The telescopic platforms 38 have a telescopic movement relationship on the limiting seat 30. A T-seat 41 is fixedly connected to the outer contour of the bifurcated part of any limiting seat 30. A round seat 47 is configured in the T-seat 41. The round seat 47 is connected to the corresponding transmission lead screw 34. A magnet one 50 and an elastic part one 51 are arranged on the side of the round seat 47 deviating from the transmission lead screw 34 in a telescopic movement manner. The side of the magnet one 50 deviating from the round seat 47 is fitted 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. A magnet two 56 is arranged in the linkage cover 52. A limiting circular hoop 57 is arranged on the T-seat 41. The side of the limiting circular hoop 57 deviating from the T-seat 41 faces the linkage cover 52;

[0047] Refer to Figure 4, a thread channel 39 is reserved on the telescopic table 38. The telescopic table 38 is threadedly connected and driven with the transmission lead screw 34 through the thread channel 39. A long strip channel 31 is reserved on the surface of the limiting seat 30. The long strip channel 31 communicates with the space one. An extension arm 40 is installed on the telescopic table 38. The extension arm 40 moves telescopically in the long strip channel 31. Conical parts two 37 are installed at the parts of several transmission lead screws 34 extending into the space one. A conical part one 33 is fixedly connected to the peripheral surface of the linkage column 32. The conical part one 33 is in meshing transmission with the conical part two 37. A disc 35 is installed at the other bifurcated part of the limiting seat 30. The disc 35 is connected to the corresponding transmission lead screw 34. Relying on the meshing transmission relationship between the conical part one 33 and the conical part two 37, several transmission lead screws 34 can rotate together. After one end of the steel bar is butted to the limiting seat 30, the disc 35 is rotated, so that the corresponding transmission lead screw 34 can drive the telescopic table 38 to perform telescopic movement. When the corresponding conical part two 37 meshes with the conical part one 33, the linkage column 32 rotates. At the same time, the conical part one 33 rotates and drives the other conical parts two 37 to rotate, so that several telescopic tables 38 move relatively together, so as to limit the ends of steel bars of different specifications;

[0048] Refer to Figure 8 and 9 , an annular space 42 is milled in the T-shaped seat 41. The round seat 47 is hinged in the annular space 42. A spline channel 48 is reserved at the axis center of the round seat 47. A spline shaft 36 is installed at the part where the transmission lead screw 34 extends out of the limiting seat 30. The spline channel 48 is in an embedded connection with the spline shaft 36 at its corresponding position. A plurality of round openings one 49 are milled in an array on the side of the round seat 47 deviating from the transmission lead screw 34. Annular openings 43 with the same number as the round openings one 49 are milled on the inner edge of the annular space 42. The overall distance of the magnet one 50 is larger than the distance between the annular openings 43. The magnet one 50 moves telescopically in the round opening one 49. An elastic part one 51 is installed between the part where the magnet one 50 extends into the round opening one 49 and the inner edge of the round opening one 49. The magnet one 50 is in an embedded connection with the annular opening 43;

[0049] Refer to Figure 6 and 10, on the side of the linkage cover 52 facing the T-seat 41, there are reserved round openings two 54 with the same number as the annular openings 43. The magnet two 56 is located in the round opening two 54. The opposite surfaces of the magnet one 50 and the magnet two 56 are both S poles. A pair of opening marks 45 and closing marks 46 are installed on the T-seat 41. The pair of opening marks 45 and closing marks 46 are alternately distributed at equal angles. A display opening 53 is milled on the linkage cover 52. When the transmission lead 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 two 56 is aligned with the annular opening 43. Under the characteristic that the opposite surfaces of the magnet two 56 and the annular opening 43 are both S poles, the magnet one 50 will be affected and move towards the deep part of the round opening one 49. The elastic member one 51 is squeezed at this moment, and the magnet one 50 is no longer fitted in the annular opening 43. The round seat 47 in this state can be rotated by the transmission lead screw 34. After adjusting the state of the telescopic table 38 by relying on the transmission lead screw 34 and in the fine-tuning state, the round opening one 49 is aligned with the annular opening 43. The linkage cover 52 is rotated so that the display opening 53 is aligned with the closing mark 46. At this time, the magnet two 56 is misaligned with the annular opening 43. Under the action of the elastic member one 51, the magnet one 50 can be fitted into the annular opening 43. At this time, the round seat 47 cannot be rotated under the limitation of the magnet one 50. The round seat 47 directly limits the state of the transmission lead screw 34 under the characteristic of the spline channel 48, so as to prevent the transmission lead screw 34 from being shaken and causing the telescopic table 38 to have a position deviation, so that when the steel bar is subjected to quality inspection, its axis is highly coincident with the axis of the limiting seat 30, thereby improving the accuracy of the inspection result.

[0050] Refer to Figure 5 and 6, the telescopic movement of the limiting hoop 57 on the T seat 41 is restricted. A number of linear grooves 44 distributed in an array are milled on the circumferential surface of the T seat 41. A number of traction platforms 58 distributed in an array are installed on the inner edge of the limiting hoop 57. The number of installed traction platforms 58 is the same as that of the linear grooves 44. The traction platforms 58 perform telescopic movement in the linear grooves 44. A number of trapezoidal platforms 59 distributed in an array are installed on the side of the limiting hoop 57 facing the linkage cover 52. A number of trapezoidal openings 55 distributed in an array are milled on the side of the linkage cover 52 facing the transmission lead screw 34. The number of installed trapezoidal platforms 59 is the same as that of the trapezoidal openings 55. The trapezoidal platforms 59 are paired with the trapezoidal openings 55. An elastic member II 60 is installed between the limiting hoop 57 and the T seat 41. The elastic member II 60 is located on the circumferential surface of the T seat 41. The traction platforms 58 perform telescopic movement on the linear grooves 44 to guide the limiting hoop 57 when its position changes. When the display port 53 is exactly opposite the opening mark 45 and the closing mark 46, under the action of the elastic member II 60, the limiting hoop 57 will be linked to move towards the position of the linkage cover 52. The trapezoidal openings 55 are located in the trapezoidal platforms 59. At this time, the state of the linkage cover 52 can be limited, improving the stability of the transmission lead screw 34 after being limited or the limitation being cancelled.

[0051] The following can be achieved: Open the outer cover 21, adjust the circular ring 26 and the telescopic arm 25 to the outermost position, then place the steel bar between a pair of limiting seats 30, and under the action of the bidirectional lead screw 28, make a pair of telescopic arms 25 move relatively, so as to adapt to steel bars of different lengths. Align one end of the steel bar with the limiting seat 30, and perform a turning operation on the linkage cover 52 until the display port 53 is directly facing the opening mark 45. At this moment, the second magnet 56 will also move to a position directly facing the annular port 43. Under the feature that both the opposite surfaces of the second magnet 56 and the annular port 43 are S poles, the first magnet 50 will be acted upon to move deeper into the circular port 49. The first elastic member 51 is squeezed at this moment, and the first magnet 50 no longer fits into the annular port 43. In this state, the circular seat 47 can be driven by the transmission lead screw 34 to perform a turning motion. Perform a turning operation on the disc 35 so that the corresponding transmission lead screw 34 can drive the telescopic platform 38 to perform a telescopic motion. Under the engagement of the corresponding second tapered member 37 with the first tapered member 33, the linkage column 32 rotates. At the same time, the first tapered member 33 rotates to drive the other second tapered members 37 to rotate, so that several telescopic platforms 38 move relatively together, so as to limit the ends of steel bars of different specifications. After several extension arms 40 limit the steel bar and after fine adjustment, perform a turning operation on the linkage cover 52 so that the display port 53 is directly facing the closing mark 46. At this time, the second magnet 56 is misaligned with the annular port 43, and the circular port 49 is directly facing the annular port 43. Under the action of the first elastic member 51, the first magnet 50 can fit into the annular port 43. At this time, the circular seat 47 cannot perform a turning operation under the limitation of the first magnet 50. The circular seat 47 directly limits the state of the transmission lead screw 34 under the feature of the spline channel 48, so as to prevent the transmission lead screw 34 from being shaken and causing the telescopic platform 38 to have a position deviation, so that when the steel bar is subjected to quality inspection, its axis is highly coincident with the axis of the limiting seat 30, thereby improving the accuracy of the inspection result. And the circular ring 26 is controlled to perform a telescopic motion. At this time, the scanner 27 detects the surface of the steel bar along with the circular ring 26. When the display port 53 is directly facing the opening mark 45 and the closing mark 46 positions, under the acting force of the second elastic member 60, the limiting hoop 57 will be driven to move towards the position of the linkage cover 52. The trapezoidal port 55 is located in the trapezoidal platform 59. At this time, the state of the linkage cover 52 can be limited, improving the stability of the transmission lead screw 34 after being limited or the limitation being cancelled.

[0052] It should be understood that in the development process of any actual implementation, in any engineering or design project, a large number of specific implementation decisions can be made. Such development efforts may be complex and time-consuming, but for those ordinary technical personnel who benefit from this disclosure, without excessive experimentation, the development efforts will be a routine work of design, manufacturing and production.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A device for detecting the quality of steel bars in construction projects, characterized in that: It includes a detection tooling, an outer cover, an outer expansion table, and an X-axis mechanism; A bearing table is configured in the detection tooling. A bidirectional lead screw is hinged in the bearing table. A pair of telescopic arms are screwed onto the bidirectional lead screw. A limiting seat is arranged on the opposite surface of the telescopic arms; A ring moves telescopically on the bearing table. A scanner is arranged in the ring; The limiting seat has several bifurcated parts. A space one is milled in the bifurcated parts of several limiting seats. A space two is reserved in the center of the limiting seat. Several space ones are arranged in an array outside the space two. A linkage column is hingedly arranged in the space two of the limiting seat. A transmission lead screw is hinged in each of the space ones of several limiting seats. The parts of several transmission lead screws that jointly face the linkage column extend into the space two. Telescopic tables are correspondingly arranged at the positions of several space ones of the limiting seat. The telescopic tables are located on the peripheral surface of the transmission lead screw. The telescopic tables are in a telescopic movement relationship with the limiting seat. A T-seat is fixedly connected to the outer contour of the bifurcated part of any limiting seat. A linkage cover is hingedly arranged on the side of the T-seat that deviates from the limiting seat; An outer cover is hinged on the detection tooling. An outer expansion table is arranged on one side of the detection tooling. When the X-axis mechanism moves telescopically, it is arranged on the outer expansion table. A round seat is configured in the T-seat. The round seat is connected to the corresponding transmission lead screw. A magnet one and an elastic part one are arranged on the side of the round seat that deviates from the transmission lead screw in a telescopic movement manner. The side of the magnet one that deviates from the round seat is fitted with the T-seat; An annular space is milled in the T-seat. The round seat is hingedly located in the annular space. A spline channel is reserved at the axis center of the round seat. A spline shaft is arranged at the part where the transmission lead screw extends out of the limiting seat. The spline channel is in an embedded connection with the spline shaft at its corresponding position. Several round openings one are milled in an array on the side of the round seat that deviates from the transmission lead screw; Annular openings with the same number as the round openings one are milled on the inner edge of the annular space. The overall distance of the magnet one is larger than the distance between the annular openings. The magnet one moves telescopically in the round openings one. The elastic part one is arranged between the part where the magnet one extends into the round opening one and the inner edge of the round opening one. The magnet one is in an embedded connection with the annular opening; 2. The construction project steel bar quality detection device according to claim 1, characterized in that: A magnet two is arranged in the linkage cover. A limiting circular hoop is arranged on the T-seat. The side of the limiting circular hoop that deviates from the T-seat faces the linkage cover; 3. The construction project steel bar quality detection device according to claim 1, characterized in that: A thread channel is reserved on the telescopic table. The telescopic table is in a threaded transmission connection with the transmission lead screw through the thread channel. A long strip channel is reserved on the surface of the limiting seat. The long strip channel communicates with the space one. An extension arm is arranged on the telescopic table. The extension arm moves telescopically in the long strip channel; 4. The construction project steel bar quality detection device according to claim 1, wherein: Conical parts two are arranged at the parts where several transmission lead screws extend into the space one. A conical part one is fixedly connected to the peripheral surface of the linkage column. Tooth groove patterns are milled in an array on the outer peripheries of the conical part one and the conical part two. The conical part one and the conical part two are in a meshing transmission relationship. A disc is arranged at the other bifurcated part of the limiting seat. The disc is connected to the corresponding transmission lead screw.

5. The construction project steel bar quality detection device according to claim 2, characterized in that: On one side of the linkage cover facing the T seat, there are reserved a number of second round openings equal to the number of the annular openings. The second magnet is located in the second round opening. The opposite surfaces of the second magnet and the first magnet are both S poles. A pair of opening marks and closing marks are arranged on the T seat. The pair of opening marks and closing marks are alternately distributed at equal angles. A display opening is milled on the linkage cover.

6. The building engineering steel bar quality detection device according to claim 2, characterized in that: The limiting hoop makes a telescopic movement on the T seat. A number of linear grooves are milled on the circumferential surface of the T seat in an array. A number of traction platforms are arranged on the inner edge of the limiting hoop in an array. The number of the traction platforms is the same as that of the linear grooves. The traction platforms make telescopic movements in the linear grooves. A number of trapezoidal platforms are arranged on one side of the limiting hoop facing the linkage cover in an array.

7. The building engineering steel bar quality detection device according to claim 6, characterized in that: A number of trapezoidal openings are milled on one side of the linkage cover facing the transmission lead screw in an array. The number of the trapezoidal platforms is the same as that of the trapezoidal openings. The trapezoidal platforms are paired with the trapezoidal openings. A second elastic member is arranged between the limiting hoop and the T seat. The second elastic member is located on the circumferential surface of the T seat.

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