Method for on-site detection of construction steel and detection device thereof

Abstract

The application discloses a kind of construction steel on-site detection method, comprising the following steps: (1) for the same specification, same batch number, same delivery state square steel, every batch square steel adopts the way of witness sampling, sampling four: (2) four square steels are cut into multiple square steel samples, then take square steel samples in different positions;(3) the square steel sample obtained is carried out surface rust removal and dirt removal treatment;(4) the measuring area of square steel sample is selected, and the surface of measuring area square steel should be polished, polishing can remove various coatings with steel hammer or angle grinder and the like equipment, and is polished to surface roughness not more than 1.6um with coarse and fine sandpaper;(5) before each measuring area test, leed hardness should be calibrated on standard block, and the reading difference of adjacent two points should be less than 12HL when calibration;(4) the tensile strength test of square steel sample is completed using leed hardness gauge;(7) according to leed hardness conversion tensile strength.

Description

Technical Field

[0001] This invention belongs to the field of steel testing technology, and specifically relates to a method and device for on-site testing of building steel. Background Technology

[0002] The testing and evaluation of material strength is a fundamental requirement for on-site inspection of building structures. For existing steel structures, the strength is primarily tested through on-site sampling for tensile strength testing and chemical analysis. However, this method is not only time-consuming and labor-intensive but also causes significant damage to the structure. Furthermore, it cannot achieve large-scale sampling for structures lacking drawings. Therefore, in recent years, non-destructive testing techniques, such as hardness testing, have been widely adopted.

[0003] On-site evaluation of steel tensile strength test results often refers to the "Conversion Values ​​of Hardness and Strength of Ferrous Metals" (GB / T1172-1999). However, GB / T1172 only provides the relationship between Rockwell, Vickers, and Brinell hardness and steel tensile strength. Since these three hardness instruments require fixed open-section equipment, their practicality and efficiency for on-site testing are low. Therefore, a Leeb hardness tester is typically used on-site. The relationship between Leeb hardness and steel tensile strength is obtained by referring to the conversion table between Leeb hardness and Vickers hardness provided in "Metallic Materials Leeb Hardness Test Part 4: Hardness Value Conversion Table" (GB / T17394.4-2014).

[0004] In the Leeb hardness test of square steel, due to the relatively long length of square steel and the limitations imposed by the complex terrain of the construction site, long strips of square steel often cannot be placed stably. Therefore, it is necessary to cut the square steel into smaller sections. Compared to longer square steel, smaller sections are easier to place stably on the construction site. Then, several sections are selected for testing. During the testing process, it is also necessary to clean the dirt and rust on the surface of the square steel. Current technology often uses manual steel wool for polishing and cleaning, which is very time-consuming and labor-intensive, affecting the testing efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a method for on-site testing of building steel, which facilitates the Leeb hardness testing of square steel on the construction site.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a method for on-site testing of building steel, comprising the following steps:

[0007] (1) For square steel bars of the same specification, batch number, and delivery condition, four bars shall be sampled for each batch of square steel bars using a witnessed sampling method:

[0008] (2) Cut the four square steel bars into multiple square steel samples, and then take square steel samples from different positions;

[0009] (3) The obtained square steel samples were subjected to surface rust removal and dirt removal treatment;

[0010] (4) Select the test area of ​​the square steel sample and grind the surface of the square steel in the test area. Grinding can be done with a steel mill or angle grinder to remove various coatings, and then grind with coarse and fine sandpaper until the surface roughness is no more than 1.6um.

[0011] (5) Before testing each test area, the Leeb hardness should be calibrated on a standard block. During calibration, the difference between the readings of two adjacent points should be less than 12HL.

[0012] (4) Use a Leeb hardness tester to perform tensile strength tests on the square steel samples;

[0013] (7) Calculate tensile strength based on Leeb hardness.

[0014] By adopting the above technical solution, for square steel of the same specification, batch number, and delivery condition at the construction site, four square steel bars are sampled from each batch using a witnessed sampling method. The four square steel bars are then cut into multiple square steel samples, and square steel samples from different locations are taken. The obtained square steel samples are then subjected to surface rust removal treatment, and the test area of ​​the square steel is then ground. Finally, the tensile strength test of the square steel samples can be completed using a Leeb hardness tester.

[0015] The purpose of this invention is to provide a testing device for on-site testing of building steel, which facilitates the testing of tensile strength of square steel on-site.

[0016] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a testing device for on-site testing of building steel, comprising a base, a Leeb hardness tester located on the base, rollers rotatably connected to four corners on the lower surface of the base, a horizontal adjustment component disposed on the lower side of the base, a cutting component disposed on the base for cutting the steel, and a rust removal component disposed on the base for removing rust from the steel.

[0017] By adopting the above technical solution, the platform is moved to the construction site using rollers. Then, the platform is adjusted to a horizontal position according to the ground conditions of the construction site using a leveling component. The square steel is cut using a cutting component to obtain a suitable sample length for tensile strength testing. At the same time, the surface of the square steel is removed using a rust removal component to avoid the presence of rust on the surface of the square steel affecting the tensile strength test. Finally, the tensile strength of the obtained square steel sample can be tested using a Leeb hardness tester on the platform, thus facilitating tensile strength testing of square steel on the construction site.

[0018] A further configuration of the present invention is as follows: the horizontal adjustment component includes an internal threaded sleeve disposed at the four corners of the base, a threaded post threadedly connected to the internal threaded sleeve, and a pad disposed at the lower end of the threaded post for support on the ground.

[0019] By adopting the above technical solution, the distance between the pad and the base can be adjusted by rotating the threaded column. The four pads can support the base at the four corners on the ground of the construction site, thereby ensuring that the base is in a horizontal state, which facilitates the tensile strength test of the square steel on the base.

[0020] A further configuration of the present invention is as follows: the cutting assembly includes two first columns disposed at the end of the base away from the Leeb hardness tester, a cutting seat disposed at the upper end of the two first columns with a U-shaped cross-section for embedding square steel, a second column disposed on one side of the base, a first swing arm disposed on the second column and with one end hinged to the upper end of the second column, a first motor disposed at the end of the first swing arm away from the second column, a cutting blade disposed on the output shaft of the first motor, a third column disposed on the side of the base near the second column, a second swing arm disposed on the third column and with one end hinged to the upper end of the third column, a second motor disposed on the base for driving the second swing arm to rotate, and a guide wheel disposed at the end of the second swing arm away from the third column for abutting against the lower side of the first swing arm.

[0021] By adopting the above technical solution, the square steel is embedded in the cutting seat, and the cutting seat limits the square steel, allowing the square steel to move back and forth horizontally along the cutting seat. After the second motor drives the second swing arm to rotate, the second swing arm abuts against the lower side of the first swing arm through the guide wheel. Therefore, the rotation of the second swing arm can drive the first swing arm to swing up and down. Subsequently, the first swing arm can drive the cutting blade to move up and down. After the first motor drives the cutting blade to rotate, the downward-moving cutting blade can cut the square steel on the lower side.

[0022] A further configuration of the present invention is as follows: the rust removal assembly includes a fourth column disposed on the base and located between the Leeb hardness tester and the first column; a first guide sleeve disposed on the upper end of the fourth column; a movable sleeve embedded in the first guide sleeve for the end of the square steel to be inserted; a retaining ring disposed on the inner wall of the movable sleeve for the end of the square steel to be pushed; a connecting arm disposed on the side wall of the movable sleeve near the end of the first column; a third motor disposed on the connecting arm; an extension arm disposed on the output shaft of the third motor; wire brush bristles disposed on the periphery of the extension arm; a driven gear disposed on the periphery of the movable sleeve away from the connecting arm; a fifth column disposed on the base and near the fourth column; a fourth motor disposed on the upper end of the fifth column; and a driving gear disposed on the output shaft of the fourth motor for the driven gear to engage after sliding.

[0023] By adopting the above technical solution, before the square steel needs to be cut, the operator first pushes the square steel in the cutting seat so that the end of the square steel is embedded in the movable sleeve. Then, the square steel can push the retaining ring to move the movable sleeve away from the cutting seat. After the driven gear at the end of the movable sleeve moves towards the side closer to the driving gear, it can mesh with the driving gear. The driving gear is driven to rotate by the fourth motor. Then, the driving gear can drive the driven gear and the movable sleeve to rotate. At this time, the movable sleeve can drive the connecting arm to rotate around the circumference of the square steel. Then, the third motor drives the extension arm to rotate. The extension arm can clean the rust on the circumference surface of the square steel by the steel wire brush on the circumference, and finally the rust removal on the surface of the square steel can be completed.

[0024] A further feature of the present invention is that a first return spring is also fitted on the movable sleeve, and a connecting ring is provided at one end of the first return spring, which is fitted on the movable sleeve and abuts against the end of the first guide sleeve.

[0025] By adopting the above technical solution, after the square steel is cut and detached from the movable sleeve, the elastic restoring force of the first return spring can drive the movable sleeve to move towards the side closer to the cutting seat, so that the driving gear and the driven gear are separated when there is no need to remove rust, thus avoiding the driving gear from driving the driven gear to do useless work.

[0026] A further configuration of the present invention includes: a sixth column is provided on the base platform near the fourth column; the upper end of the sixth column has a second guide sleeve embedded in a movable sleeve; a magnetic column passing through a retaining ring and used to attract the magnetic column to the end face of the square steel is provided in the second guide sleeve; a driving ring abutting against the retaining ring is provided around the magnetic column; a seventh column is provided on the base platform near the third column; a third guide sleeve is provided at the upper end of the seventh column; a braking column abutting against the lower side of the second swing arm and braking the second swing arm is provided in the third guide sleeve; the upper end of the third column... A driven shaft is rotatably connected to the end of the second swing arm, and a driven pulley is provided on the driven shaft. A driving pulley is provided on the output shaft of the second motor. A transmission belt is provided between the driven pulley and the driving pulley. A connecting rope is provided between the end of the brake column and the end of the magnet column. Two connecting columns are provided on the base at the position of the connecting rope. A guide ring is provided at the upper end of the connecting column for the connecting rope to pass through. A fixing ring is provided at the end of the brake column away from the second swing arm. A second return spring is sleeved on the brake column, with one end pressed against the fixing ring and the other end pressed against the seventh column.

[0027] By adopting the above technical solution, the square steel is derusted before it needs to be cut. When the square steel is embedded in the movable sleeve, it will first be attracted to the end of the magnetic column. Then, the drive ring of the magnetic column will abut against the retaining ring, thereby driving the movable sleeve to move, so that the driving gear and the driven gear mesh. Since the magnetic column moves away from the cutting seat, the connecting rope will slack between the guide rings and cannot affect the brake column. At this time, the brake column abuts against the lower side of the second swing arm, thereby braking the second swing arm. At the same time, the second motor remains running, but since it cannot drive the second swing arm to rotate, the transmission belt and the driven pulley are in a slipping state.

[0028] After the rust removal is completed, since the square steel below the cutting blade has not been rusted, it is necessary to pull the square steel out of the movable sleeve a certain distance so that the position of the square steel to be rusted is moved to below the cutting blade. Then the square steel can be cut by the cutting blade so that the surface of the cut square steel can be completely rusted.

[0029] When the operator pulls the square steel to move away from the movable sleeve, the movable sleeve moves towards the cutting seat under the action of the first return spring, thus separating the driven gear and the driving gear. Then, since the magnetic column is still attracted to the end of the square steel, the square steel will drive the magnetic column to move towards the cutting seat. At this time, the magnetic column can pull the connecting rope, which can drive the brake column to move away from the second swing arm. The second return spring is stretched, and then the brake column can be moved away from the underside of the second swing arm. At this time, the driven pulley can rotate under the drive of the transmission belt, thereby driving the second swing arm to swing downward. Then the first swing arm can drive the cutting blade to move down and cut the square steel.

[0030] At the same time, after the cutting is completed, the square steel attracted to the magnetic column falls under its own gravity, and the magnetic column separates from the square steel. At this time, under the elastic restoring force of the second return spring, the brake column moves closer to the second swing arm again. After the second swing arm rotates once and drives the first swing arm to move upward, the second swing arm can again contact the brake column. The brake column can brake the second swing arm again, thereby preventing the first swing arm from swinging downward again. Finally, after the square steel is cut once, the first swing arm can stop at the initial position, which is convenient for the first swing arm to move down and cut the square steel again.

[0031] When the brake column moves toward the side closer to the second swing arm and pulls the connecting rope, the connecting rope can drive the magnet column inside the movable sleeve to reset so that the next engagement can be performed.

[0032] A further configuration of the present invention is that, when the second reset spring is in its natural state, the end face of the magnet post away from the connecting rope is parallel to the end face of the movable sleeve.

[0033] By adopting the above technical solution, when the square steel is pulled away from the movable sleeve, the square steel can pull the end of the magnet column to the outside of the movable sleeve, so that after the square steel is cut, the square steel can fall off the magnet column smoothly under its own gravity.

[0034] A further feature of the present invention is that the upper end of the sixth column is provided with a positioning ring for the movable sleeve to abut against the driven gear.

[0035] By adopting the above technical solution, the movement of the movable sleeve can be limited by the positioning ring, thus preventing excessive displacement of the movable sleeve.

[0036] In summary, the present invention has the following beneficial effects: before the square steel needs to be cut, it is first derusted and cleaned. When the square steel is embedded in the movable sleeve, it first attracts the end of the magnetic column, and then the drive ring of the magnetic column abuts against the retaining ring, thereby driving the movable sleeve to move, so that the driving gear and the driven gear mesh. Since the magnetic column moves away from the cutting seat, the connecting rope will slack between the guide rings and cannot affect the brake column. At this time, the brake column abuts against the lower side of the second swing arm, thereby braking the second swing arm. At the same time, the second motor remains running, but since it cannot drive the second swing arm to rotate, the transmission belt and the driven pulley are in a slipping state.

[0037] The drive gear is driven by a fourth motor to rotate, which in turn drives the driven gear and the movable sleeve to rotate. At this time, the movable sleeve drives the connecting arm to rotate around the circumference of the square steel. Then, the third motor drives the extension arm to rotate, and the extension arm uses the wire brushes on the circumference to clean the rust and dirt on the surface of the square steel, thus completing the rust removal of the square steel surface. After the rust removal is completed, since the square steel below the cutting blade has not been rusted, it needs to be pulled out of the movable sleeve a certain distance so that the rust-removed part of the square steel is moved to below the cutting blade. Then the square steel can be cut by the cutting blade so that the surface of the cut square steel is completely rust-removed.

[0038] When the operator pulls the square steel to move away from the movable sleeve, the movable sleeve moves towards the cutting seat under the action of the first return spring, thus separating the driven gear and the driving gear. Then, since the magnetic column is still attracted to the end of the square steel, the square steel will drive the magnetic column to move towards the cutting seat. At this time, the magnetic column can pull the connecting rope, which can drive the brake column to move away from the second swing arm. The second return spring is stretched, and then the brake column can be moved away from the underside of the second swing arm. At this time, the driven pulley can rotate under the drive of the transmission belt, thereby driving the second swing arm to swing downward. Then the first swing arm can drive the cutting blade to move down and cut the square steel.

[0039] At the same time, after the cutting is completed, the square steel attracted to the magnetic column falls under its own gravity, and the magnetic column separates from the square steel. At this time, under the elastic restoring force of the second return spring, the brake column moves closer to the second swing arm again. After the second swing arm rotates once and drives the first swing arm to move upward, the second swing arm can again contact the brake column. The brake column can brake the second swing arm again, thereby preventing the first swing arm from swinging downward again. Finally, after the square steel is cut once, the first swing arm can stop at the initial position, which is convenient for the first swing arm to move down and cut the square steel again.

[0040] When the brake column moves toward the side closer to the second swing arm and pulls the connecting rope, the connecting rope can drive the magnet column inside the movable sleeve to reset so that the next engagement can be performed. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the detection device in this invention;

[0043] Figure 2 This is an enlarged view of the structure of the cutting component and the rust removal component in this invention;

[0044] Figure 3 This is an enlarged view of the cutting component in this invention;

[0045] Figure 4 This is an enlarged view of the rust removal component in this invention;

[0046] Figure 5This is a cross-sectional view of the connection relationship between the first guide sleeve, the movable sleeve, the first return spring, the driven gear, the driving gear and the magnetic column in this invention. At this time, the square steel has not been derusted and cut, and the second return spring is in its natural state.

[0047] Figure 6 This is a cross-sectional view of the connection relationship between the first guide sleeve, the movable sleeve, the first return spring, the driven gear, the driving gear, and the magnetic column in this invention. At this time, the square steel pushes the movable sleeve to make the driven gear and the driving gear mesh.

[0048] Figure 7 This is a cross-sectional view of the connection relationship between the first guide sleeve, the movable sleeve, the first return spring, the driven gear, the driving gear and the magnetic column in this invention. At this time, the square steel has not been derusted and cut. At this time, the square steel has been derusted and the square steel is pulled away from the movable sleeve.

[0049] Figure 8 This is a top view of the cutting component and the rust removal component in this invention, at which point the square steel will be pushed into the movable sleeve;

[0050] Figure 9 This is a top view of the cutting component and the rust removal component in this invention. At this time, the square steel has been rusted and is pulled away from the side of the movable sleeve, and the brake column is moved away from the underside of the second swing arm.

[0051] In the diagram, 1. Base; 2. Leeb hardness tester; 3. Roller; 4. Horizontal adjustment assembly; 41. Internal threaded sleeve; 42. Threaded post; 43. Pad; 5. Cutting assembly; 51. First column; 52. Cutting seat; 53. Second column; 54. First swing arm; 55. First motor; 56. Cutting blade; 57. Third column; 571. Driven shaft; 572. Driven pulley; 58. Second swing arm; 59. Second motor; 591. Drive pulley; 592. Transmission belt; 501. Guide wheel; 6. Rust removal assembly; 61. Fourth column; 62. First guide sleeve; 63. Movable sleeve; 631. First return spring; 632. Connecting ring; 64. Snap ring; 65. Connecting arm; 66. Third motor; 67. Extended arm; 68. Wire brush bristles; 69. Driven gear; 601. Fifth column; 602. Fourth motor; 603. Drive gear; 7. Sixth column; 71. Second guide sleeve; 72. Magnet column; 721. Drive ring; 73. Positioning ring; 8. Seventh column; 81. Third guide sleeve; 82. Brake column; 821. Connecting rope; 822. Fixing ring; 823. Second return spring; 9. Connecting column; 91. Guide ring. Detailed Implementation

[0052] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0053] A method for on-site testing of building steel includes the following steps:

[0054] (1) For square steel bars of the same specification, batch number, and delivery condition, four bars shall be sampled for each batch of square steel bars using a witnessed sampling method:

[0055] (2) Cut the four square steel bars into multiple square steel samples, and then take square steel samples from different positions;

[0056] (3) The obtained square steel samples were subjected to surface rust removal and dirt removal treatment;

[0057] (4) Select the test area of ​​the square steel sample and grind the surface of the square steel in the test area. Grinding can be done with a steel mill or angle grinder to remove various coatings, and then grind with coarse and fine sandpaper until the surface roughness is no more than 1.6um.

[0058] (5) Before testing each test area, the Leeb hardness should be calibrated on a standard block. During calibration, the difference between the readings of two adjacent points should be less than 12HL.

[0059] (4) Use a Leeb hardness tester to perform tensile strength tests on the square steel samples;

[0060] (7) Calculate tensile strength based on Leeb hardness.

[0061] For square steel of the same specification, batch number, and delivery condition at the construction site, witness sampling is adopted for each batch of square steel. Four samples are taken, and then the four square steels are cut into multiple square steel samples. Square steel samples from different locations are then taken. The obtained square steel samples are then subjected to surface rust removal treatment, and the test area of ​​the square steel is then ground. Finally, the tensile strength test of the square steel samples can be completed using a Leeb hardness tester.

[0062] A testing device for on-site testing of building steel, referring to Figure 1 , Figure 2The testing device for this on-site testing method of building steel includes a base 1, a Leeb hardness tester 2, rollers 3, a leveling adjustment component 4, a cutting component 5, and a rust removal component 6. The Leeb hardness tester 2 is fixed to one end of the base 1 by being encased in a device box. The rollers 3 are rotatably connected to the four corners of the lower surface of the base 1 via shafts and bearing seats, allowing the base 1 to be moved easily, thereby moving the Leeb hardness tester 2. The leveling adjustment component 4 is located on the lower side of the base 1 and is used to adjust the horizontal position of the base 1 on the construction site to cope with the complex terrain environment. The cutting component 5 is located on the base 1 and is used to cut the steel. The rust removal component 6 is also located on the base 1 and is used to remove rust from the surface of the steel.

[0063] Reference Figure 1 The horizontal adjustment component 4 includes an internal threaded sleeve 41, a threaded post 42, and a pad 43. The internal threaded sleeve 41 is welded to the four corners of the base 1, while the threaded post 42 is threaded into the internal threaded sleeve 41. The pad 43 is fixed to the lower end of the threaded post 42 by bolts and is used to support the base on the ground. By rotating the threaded post 42, the distance between the pad 43 and the base 1 can be adjusted. With the four pads 43, the base 1 can be supported on the ground at the four corners of the construction site, thus ensuring that the base 1 is in a horizontal state, which facilitates the tensile strength testing of the square steel on the base 1.

[0064] Reference Figure 1 , Figure 2 , Figure 3The cutting assembly 5 includes a first column 51, a cutting base 52, a second column 53, a first swing arm 54, a first motor 55, a cutting blade 56, a third column 57, a second swing arm 58, a second motor 59, and a guide wheel 501. Two first columns 51 are provided, with their lower ends bolted to the base 1 at the end furthest from the Leeb hardness tester 2. The cutting base 52 is welded to the upper ends of the two first columns 51, and is elongated with a U-shaped cross-section for embedding square steel. The lower end of the second column 53 is bolted to one side of the base 1, and one end of the first swing arm 54 is hinged to the upper end of the second column 53. The first motor 55 is bolted to the end of the first swing arm 54 furthest from the second column 53. The cutting blade 56 is fixed... The first motor 55 is fixed to the output shaft of the second motor 54. The lower end of the third column 57 is bolted to the base 1 and located near the second column 53. One end of the second swing arm 58 is hinged to the upper end of the third column 57. The second motor 59 is bolted to the base 1. The upper end of the third column 57 is rotatably connected to the driven shaft 571, which is welded to the end of the second swing arm 58, via a bearing. A driven pulley 572 is keyed to the driven shaft 571. A driving pulley 591 is keyed to the output shaft of the second motor 59. A transmission belt 592 is provided between the driven pulley 572 and the driving pulley 591. Meanwhile, the guide wheel 501 is rotatably connected to the end of the second swing arm 58 away from the third column 57 and is used to abut against the lower side of the first swing arm 54.

[0065] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5The rust removal component 6 includes a fourth column 61, a first guide sleeve 62, a movable sleeve 63, a retaining ring 64, a connecting arm 65, a third motor 66, an extension arm 67, wire brush bristles 68, a driven gear 69, a fifth column 601, a fourth motor 602, and a driving gear 603. The lower end of the fourth column 61 is bolted to the base 1 and located between the Leeb hardness tester 2 and the first column 51. The first guide sleeve 62 is welded to the upper end of the fourth column 61, and the movable sleeve 63 is embedded within the first guide sleeve 62. The movable sleeve 63 allows the end of a square steel bar to be inserted. A first return spring 631 is also fitted onto the movable sleeve 63. A connecting ring 632, fitted onto the movable sleeve 63, is welded to one end of the first return spring 631. The connecting ring 632 abuts against the end of the first guide sleeve 62. The retaining ring 64 is integrally set on the inner wall of the movable sleeve 63 and is pushed by the end of the square steel. The connecting arm 65 is integrally set on the side wall of the movable sleeve 63 near the end of the first column 51. The third motor 66 is fixed to the connecting arm 65 by bolts. The extended arm 67 is fixed to the output shaft of the third motor 66 by bolts. The wire brush 68 is welded to the periphery of the extended arm 67. The driven gear 69 is welded to the periphery of the movable sleeve 63 away from the end of the connecting arm 65. The lower end of the fifth column 601 is fixed to the base 1 by bolts and is close to the side of the fourth column 61. The fourth motor 602 is fixed to the upper end of the fifth column 601 by bolts. The driving gear 603 is keyed to the output shaft of the fourth motor 602 and is engaged by the driven gear 69 after sliding.

[0066] Reference Figure 2 , Figure 3 , Figure 4 , Figure 5On the base 1, near the fourth column 61, a sixth column 7 is bolted to the side. A second guide sleeve 71, one end of which is embedded in the movable sleeve 63, is welded to the upper end of the sixth column 7. A magnetic column 72 is embedded within the second guide sleeve 71, passing through the retaining ring 64 and used to attract the square steel end face. A drive ring 721, abutting against the retaining ring 64, is integrally provided around the periphery of the magnetic column 72. A positioning ring 73 is integrally provided at the upper end of the sixth column 7, allowing the movable sleeve 63 to abut against the end near the driven gear 69. Simultaneously, on the base 1, near the third column 57, a seventh column 8 is bolted to the side. A third guide sleeve 81 is welded to the upper end of the seventh column 8, embedding a brake column 82, which abuts against the second swing arm 58. The lower side brakes the second swing arm 58. A connecting rope 821 is provided between the end of the brake column 82 and the end of the magnet column 72. One end of the connecting rope 821 is bonded to the end of the brake column 82 and the other end is bonded to the end of the magnet column 72. At the same time, two connecting columns 9 are fixed to the base 1 at the position of the connecting rope 821 by bolts. The upper end of the connecting column 9 is welded with a guide ring 91 for the connecting rope 821 to pass through. A fixing ring 822 is welded to the end of the brake column 82 away from the second swing arm 58. A second return spring 823 is sleeved on the brake column 82. One end of the second return spring 823 is pressed against the fixing ring 822 and the other end is pressed against the seventh column 8. When the second return spring 823 is in the natural state, the end face of the magnet column 72 away from the connecting rope 821 is parallel to the end face of the movable sleeve 63.

[0067] Principle: Before the square steel needs to be cut, it is first derusted and cleaned. When the square steel is embedded in the movable sleeve 63, it will first be attracted to the end of the magnetic column 72. Then, the drive ring 721 of the magnetic column 72 will abut against the retaining ring 64, thereby driving the movable sleeve 63 to move, so that the driving gear 603 and the driven gear 69 mesh. As the magnetic column 72 moves away from the cutting seat 52, the connecting rope 821 will slack between the guide rings 91 and cannot affect the brake column 82. At this time, the brake column 82 abuts against the lower side of the second swing arm 58, thereby braking the second swing arm 58. At the same time, the second motor 59 remains running, but since it cannot drive the second swing arm 58 to rotate, the transmission belt 592 and the driven pulley 572 are in a slipping state.

[0068] The drive gear 603 is driven to rotate by the fourth motor 602. The drive gear 603 then drives the driven gear 69 and the movable sleeve 63 to rotate. At this time, the movable sleeve 63 drives the connecting arm 65 to rotate around the periphery of the square steel. Then, the third motor 66 drives the extension arm 67 to rotate. The extension arm 67 can clean the rust and dirt on the periphery of the square steel through the steel wire brush 68 on the periphery, and finally complete the rust removal of the square steel surface. After the rust removal is completed, since the square steel below the cutting blade 56 has not been rusted, it is necessary to pull the square steel out of the movable sleeve 63 a certain distance so that the position of the square steel that has been rusted is moved to below the cutting blade 56. Then the square steel can be cut by the cutting blade 56 so that the surface of the cut square steel is completely rusted.

[0069] When the operator pulls the square steel to move away from the movable sleeve 63, the movable sleeve 63 moves towards the cutting seat 52 under the action of the first return spring 631, thereby separating the driven gear 69 and the driving gear 603. Then, since the magnetic column 72 is still attracted to the end of the square steel, the square steel will drive the magnetic column 72 to move towards the cutting seat 52. At this time, the magnetic column 72 can pull the connecting rope 821, and the connecting rope 821 can drive the brake column 82 to move away from the second swing arm 58. The second return spring 823 is stretched, and then the brake column 82 can move away from the underside of the second swing arm 58. At this time, the driven pulley 572 can rotate under the drive of the transmission belt 592, thereby driving the second swing arm 58 to swing downward. Then, the first swing arm 54 can drive the cutting blade 56 to move down and cut the square steel.

[0070] Simultaneously, after the cutting is completed, the square steel attracted to the magnetic column 72 falls under its own gravity, and the magnetic column 72 separates from the square steel. At this time, under the elastic restoring force of the second return spring 823, the brake column 82 moves closer to the second swing arm 58 again. After the second swing arm 58 rotates once and drives the first swing arm 54 to move upward, the second swing arm 58 can again contact the brake column 82. The brake column 82 can brake the second swing arm 58 again, thereby preventing the first swing arm 54 from swinging downward again. Finally, after the square steel is cut once, the first swing arm 54 can stop at the initial position, which is convenient for the first swing arm 54 to move downward and cut the square steel again.

[0071] When the brake column 82 moves toward the side closer to the second swing arm 58 and pulls the connecting rope 821, the connecting rope 821 can drive the magnet column 72 in the movable sleeve 63 to reset so that the next engagement can be performed.

Claims

1. A method for on-site testing of building steel, characterized in that: The testing device used in the on-site testing method includes: a base (1), a Leeb hardness tester (2) located on the base (1), rollers (3) rotatably connected to the four corners of the lower surface of the base (1), a horizontal adjustment component (4) set on the lower side of the base (1), a cutting component (5) set on the base (1) for cutting the square steel, and a rust removal component (6) set on the base (1) for removing rust from the square steel. The rust removal assembly (6) includes a fourth column (61) mounted on the base (1), a first guide sleeve (62) mounted on the upper end of the fourth column (61), a movable sleeve (63) embedded in the first guide sleeve (62) for the end of the square steel to be inserted, a retaining ring (64) mounted on the inner wall of the movable sleeve (63) for the end of the square steel to be pushed, a connecting arm (65) mounted on the side wall of the movable sleeve (63), a third motor (66) mounted on the connecting arm (65), and a transmission line mounted on the third motor (66). The extended arm (67) on the output shaft, the wire brush (68) on the periphery of the extended arm (67), the driven gear (69) on the periphery of the movable sleeve (63) away from the connecting arm (65), the fifth column (601) on the base (1) and close to the fourth column (61), the fourth motor (602) on the upper end of the fifth column (601), and the driving gear (603) on the output shaft of the fourth motor (602) for the driven gear (69) to mesh after sliding. The detection method includes the following steps: (1) For square steel of the same specification, batch number and delivery condition, four square steel bars shall be sampled for each batch by witness sampling. (2) Cut the four square steel bars into multiple square steel samples, and then take square steel samples from different positions; (3) Perform surface rust removal and dirt removal treatment on the obtained square steel samples; (4) Select the test area of ​​the square steel sample and grind the surface of the square steel in the test area. Grinding can be done with a steel mill or angle grinder to remove various coatings, and then grind with coarse and fine sandpaper until the surface roughness is no more than 1.6um. (5) Before testing each test area, the Leeb hardness should be calibrated on a standard block. During calibration, the difference between the readings of two adjacent points should be less than 12HL. (6) Use a Leeb hardness tester to perform tensile strength tests on the square steel samples; (7) Calculate tensile strength based on Leeb hardness.

2. The method for on-site testing of building steel according to claim 1, characterized in that: The horizontal adjustment assembly (4) includes an internal threaded sleeve (41) located at the four corners of the base (1), a threaded post (42) threadedly connected to the internal threaded sleeve (41), and a pad (43) located at the lower end of the threaded post (42) for supporting the ground.

3. The method for on-site testing of building steel according to claim 1, characterized in that: The cutting assembly (5) includes two first columns (51) located at the end of the base (1) away from the Leeb hardness tester (2), a cutting seat (52) located on the upper end of the two first columns (51) with a U-shaped cross-section for embedding square steel, a second column (53) located on one side of the base (1), a first swing arm (54) located on the second column (53) and hinged at one end to the upper end of the second column (53), and a first motor (55) located at the end of the first swing arm (54) away from the second column (53). The cutting blade (56) on the output shaft of the first motor (55), the third column (57) on the side of the base (1) near the second column (53), the second swing arm (58) on the third column (57) and one end of which is hinged to the upper end of the third column (57), the second motor (59) on the base (1) for driving the second swing arm (58) to rotate, and the guide wheel (501) on the end of the second swing arm (58) away from the third column (57) for abutting against the lower side of the first swing arm (54).

4. The on-site testing method for building steel according to claim 3, characterized in that: The movable sleeve (63) is also fitted with a first return spring (631), and a connecting ring (632) is provided at one end of the first return spring (631) that is fitted on the movable sleeve (63) and abuts against the end of the first guide sleeve (62).

5. The on-site testing method for building steel according to claim 4, characterized in that: A sixth column (7) is provided on the base (1) near the fourth column (61). The upper end of the sixth column (7) has a second guide sleeve (71) embedded in a movable sleeve (63). A magnet column (72) passing through a retaining ring (64) and used to attract the square steel end face is provided inside the second guide sleeve (71). A drive ring (721) abutting against the retaining ring (64) is provided around the periphery of the magnet column (72). A seventh column (8) is provided on the base (1) near the third column (57). The upper end of the seventh column (8) has a third guide sleeve (81). A brake column (82) abutting against the lower side of the second swing arm (58) and braking the second swing arm (58) is provided inside the third guide sleeve (81). The upper end of the third column (57) is rotatably connected to a component fixed to the end of the second swing arm (58). Driven shaft (571), driven pulley (572) is provided on driven shaft (571), driven pulley (591) is provided on output shaft of second motor (59), transmission belt (592) is provided between driven pulley (572) and driven pulley (591), connecting rope (821) is provided between end of brake column (82) and end of magnet column (72), two connecting columns (9) are provided on base (1) and at position of connecting rope (821), upper end of connecting column (9) is provided with guide ring (91) for connecting rope (821) to pass through, fixed ring (822) is provided at one end of brake column (82) away from second swing arm (58), second return spring (823) is sleeved on brake column (82) with one end pressed against fixed ring (822) and the other end pressed against seventh column (8).

6. The method for on-site testing of building steel according to claim 5, characterized in that: When the second reset spring (823) is in its natural state, the end face of the magnet post (72) away from the connecting rope (821) is parallel to the end face of the movable sleeve (63).

7. The method for on-site testing of building steel according to claim 5, characterized in that: The upper end of the sixth column (7) is provided with a positioning ring (73) for the movable sleeve (63) to abut against the end of the driven gear (69).

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