A cutting device for fabricated steel beam-column joint

Abstract

The application discloses a cutting device for fabricated steel structure beam-column joints and belongs to the technical field of steel structure component processing, which comprises a rotary cutting machine and a clamping assembly arranged in the machining area of the rotary cutting machine. The clamping assembly comprises a rotary clamping mechanism, a driving assembly, a radial clamping assembly and a telescopic supporting arm assembly. A rotary disc forms a clamping reference corresponding to the machining center line of the rotary cutting machine. A vertical screw rod and a horizontal screw rod drive the upper and lower side pressing plates and the left and right side pressing plates to move towards each other, respectively. A driving motor drives a friction shaft to rotate. The friction shaft drives a ring-shaped clamping seat and a crown gear to rotate through an arc-shaped clamping block and drives the vertical clamping direction and the horizontal clamping direction. When the resistance of any direction exceeds the friction transmission capacity, the friction shaft slides in the direction, and the other direction continues to be centered. The telescopic supporting arm assembly sweeps along the surface of the beam-column joint through a supporting arm inner tube and an oblique contact head, and represents the bending deviation and the local surface position abnormality according to the relative telescopic amount difference.

Description

Technical Field

[0001] This invention belongs to the field of steel structure component processing technology, and particularly relates to a cutting device for prefabricated steel structure beam-column joints. Background Technology

[0002] In prefabricated steel structure buildings, beam-column joints often use rectangular tubular components, box-shaped components, or closed-section components assembled from steel plates. After these components are prefabricated in the factory, they usually need to have installation openings, connection bevels, clearance grooves, or positioning cuts machined on multiple sides of their outer perimeter to facilitate subsequent assembly with beams, columns, and connecting plates.

[0003] For machining processes requiring corresponding cuts on all four sides of a beam-column joint, a rotary cutting device capable of 90-degree indexing is commonly used. During machining, the beam-column joint is fed into the machining area of ​​the device and held in a predetermined position by a clamp; the cutting end rotates sequentially to the cutting station corresponding to different sides to machine each side. Compared to single-sided opening or single-end face machining, this type of four-sided indexing cutting relies more on the same spatial reference. If the component deviates from the machining center of the device during clamping, although the four sides can be cut separately, the relative positions between the cuts are prone to shift.

[0004] In actual production, beam-column joints have large cross-sectional dimensions, and their outer surfaces may exhibit slight deviations due to welding, transportation, stacking, or pre-processing. After the component is placed in the fixture, it typically needs to be positioned using clamping components in both vertical and horizontal directions. Existing fixtures primarily aim to compress and fix the component. When a component first contacts a clamping component on one side, that side tends to form initial force support or limitation. If further adjustment is needed in the other direction, the friction and compression between the component and the already contacted clamping component will hinder subsequent correction.

[0005] Therefore, while existing fixtures can meet general fixing requirements, they are not ideal for simultaneously securing and centering components when there are initial deviations in their placement. This can lead to a misalignment between the actual center of the beam-column joint and the machining center of the rotary cutting equipment, making it difficult to stably form the four-sided cuts based on the same machining datum, thus affecting the correspondence of the various connection parts during subsequent assembly. Summary of the Invention

[0006] The purpose of this invention is to provide a cutting device for prefabricated steel structure beam-column joints, which solves the technical problem that when prefabricated steel structure beam-column joints are cut at 90-degree intervals on all four sides, the existing clamps tend to form rigid limits in the first contact direction when clamping components, making it difficult to continue centering in the other direction, and making it difficult for the actual center of the beam-column joint to be consistent with the machining center of the rotary cutting machine.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A cutting device for prefabricated steel structure beam-column joints includes a rotary cutting machine and a clamping assembly located in its processing area. The clamping assembly includes: a rotary clamping mechanism, including a rotary table fixedly connected to the rotary cutting machine, the rotary table forming a clamping reference corresponding to the processing center line of the rotary cutting machine, and having two vertical screws for driving the upper and lower side pressure plates to move towards each other and two horizontal screws for driving the left and right side pressure plates to move towards each other; a driving assembly, including a friction shaft, with two radial clamping assemblies disposed therewith for frictional transmission; the two radial clamping assemblies... The vertical and horizontal screws are connected to drive the system respectively, so that when the transmission resistance in any clamping direction exceeds the preset friction transmission capacity, the screw slides relative to the friction axis in that direction, and the other clamping direction continues to be centered. The telescopic support arm assembly is set in pairs on the upper and lower sides and the left and right sides of the beam-column node. It includes an outer support arm tube, an inner support arm tube that is slidably installed inside the outer support arm tube, and an oblique contact head that is fixedly connected to the inner support arm tube. The difference in the amount of telescopic extension of the relatively set inner support arm tubes during the axial sweeping process is used to determine the offset, bending trend or abnormal position of the beam-column node.

[0008] According to some embodiments, the two vertical screws have opposite thread directions and are threadedly connected to the first pressure plates located on the upper and lower sides, respectively; the two horizontal screws have opposite thread directions and are threadedly connected to the second pressure plates located on the left and right sides, respectively; the first and second pressure plates are slidably connected to the rotary table, so that the corresponding pressure plates move towards or away from each other when the corresponding screws rotate; the outer tubes of the support arms located on the upper and lower sides move with the corresponding first pressure plates, and the outer tubes of the support arms located on the left and right sides move with the corresponding second pressure plates.

[0009] According to some embodiments, the drive assembly further includes: a drive motor, the power output end of which is fixedly connected to the friction shaft; each of the radial clamping assemblies includes: an annular clamping seat, rotatably mounted on a rotary table; a plurality of arc-shaped clamping blocks disposed inside the annular clamping seat; the friction shaft passes through the annular clamping seat and makes frictional contact with the arc-shaped clamping blocks.

[0010] According to some embodiments, the rotary clamping mechanism further includes: two crown gears, which are respectively fixedly mounted on the two annular clamping seats; one of the crown gears meshes with a first transmission gear fixed on two vertical screws, and the other crown gear meshes with a second transmission gear fixed on two horizontal screws, so that the two radial clamping components drive the vertical clamping direction and the horizontal clamping direction respectively.

[0011] According to some embodiments, the rotary clamping mechanism further includes: two first pressure plates, each having an installation groove, and two drive rollers rotatably installed in the installation grooves. The two drive rollers are connected by a conveyor belt, which is used to form a rolling support interface when the first pressure plate contacts the beam-column node first.

[0012] According to some embodiments, the telescopic support arm assembly further includes: a connecting plate fixed inside the outer tube of the support arm; and a first spring connected between the connecting plate and the inner tube of the support arm.

[0013] According to some embodiments, the oblique contact head is a contact part with an inclined contact surface, which slides in contact with the corresponding side of the beam-column node in an elastic pre-tightened state; when the beam-column node enters or exits the processing area, or when the clamping assembly moves axially relative to the beam-column node, the oblique contact head sweeps along the surface of the beam-column node, and causes the inner tube of the support arm to bulge or retract with the corresponding surface.

[0014] According to some embodiments, the radial clamping assembly further includes: a radial adjustment box fixed to the annular clamping seat; a limiting block fixedly connected to the arc-shaped clamping block; a sliding pressure block slidably connected to the radial adjustment box; an adjusting bolt threadedly connected to the sliding pressure block and rotatably connected to the radial adjustment box; and a third spring connected between the sliding pressure block and the limiting block for adjusting the preload pressure of the arc-shaped clamping block on the friction shaft.

[0015] According to some embodiments, the telescopic support arm assembly further includes: a clamping seat, slidably mounted on the outer tube of the support arm and connected to a corresponding first pressure plate or second pressure plate via a second spring; a ball bearing, slidably mounted on the side of the clamping seat facing the beam-column node; a first magnetic block, fixed on the inner tube of the support arm; and a second magnetic block, fixed on the clamping seat and repelling the first magnetic block.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention transmits torsional driving force to both the vertical and lateral clamping directions via the same friction shaft. When the beam-column joint contacts the corresponding clamping component in either direction, the radial clamping component in that direction slides relative to the friction shaft due to increased transmission resistance, thus limiting further pressure in that direction. The other direction can still receive driving force and push the beam-column joint towards the clamping reference for alignment. Therefore, it is not necessary to pre-determine the offset direction of the beam-column joint, nor is it necessary to set complex sequential action procedures for the vertical and lateral clamping directions. The clamping direction switching and center correction can be automatically completed based on the actual contact resistance of the component.

[0017] 2. This invention combines the torsion-limiting friction clamping process with the attitude detection process of the telescopic support arm assembly. Since sliding occurs in the initial contact direction after reaching the preset friction transmission capacity, it can avoid continued rigid compression of the beam-column joint, reducing local deformation or surface indentation of the component caused by over-clamping; the telescopic support arm assembly obtains the difference in the amount of extension and retraction of the inner tubes of the two support arms in this state, which can reduce the interference of over-clamping on the offset judgment and bending trend judgment.

[0018] 3. This invention provides a rolling support interface for the first contacting pressure plate via a conveyor belt. When the first direction has already formed a limit and the second direction continues to be aligned, the beam-column joint can still make necessary lateral fine adjustments relative to the first pressure plate. At the same time, the oblique contact head, in an elastic pre-tightened state, is close to the surface of the component and forms a sweeping contact, which can remove local oxide scale, welding spatter, or cutting residue while obtaining the expansion difference. The torsion-limiting friction transmission, the rolling support interface, and the telescopic support arm detection work together to enable the beam-column joint to complete low overpressure clamping, center correction, and posture screening simultaneously before entering the four-sided cutting. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the clamping assembly of the present invention; Figure 3 This is a schematic diagram of the assembly structure of the rotary clamping mechanism, radial clamping assembly, and transmission gear of the present invention; Figure 4 This is a schematic diagram of the radial clamping assembly of the present invention; Figure 5 This is a schematic diagram of the structure of the first pressure plate, conveyor belt, and drive roller of the present invention; Figure 6 This is a schematic diagram of the structure of the second pressure plate of the present invention; Figure 7 This is a schematic diagram of the telescopic support arm assembly of the present invention; Figure 8 This is a schematic diagram of the structure of the clamping seat and the second magnetic block of the present invention.

[0021] Reference numerals: 100, rotary cutting machine; 200, clamping assembly; 210, drive assembly; 211, drive motor; 212, friction shaft; 220, rotary clamping mechanism; 221, rotary table; 222, vertical screw; 223, crown gear; 224, first transmission gear; 225, transverse screw; 226, second transmission gear; 227, first pressure plate; 228, conveyor belt; 229, transmission roller; 2291, second pressure plate; 230, telescopic support arm assembly; 2 31. Outer tube of support arm; 232. Angled contact head; 233. Inner tube of support arm; 234. Pressing seat; 235. Ball bearing; 236. First magnetic block; 237. Connecting plate; 238. First spring; 239. Second spring; 2391. Second magnetic block; 240. Radial clamping assembly; 241. Annular clamping seat; 242. Radial adjusting box; 243. Sliding pressure block; 244. Third spring; 245. Adjusting bolt; 246. Limiting block; 247. Arc-shaped clamping block. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of the present invention more readily understood, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] This invention is described in detail with reference to the accompanying drawings. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not to scale. Furthermore, the accompanying drawings are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0024] Furthermore, it should be noted in the description of this invention that the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Example 1: As Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, a cutting device for prefabricated steel structure beam-column joints includes a rotary cutting machine 100 and a clamping assembly 200 installed in the processing area of ​​the rotary cutting machine 100. The rotary cutting machine 100 can be an existing cutting device capable of indexing cuts around a processing centerline, and its cutting execution end is used to process the four sides of the beam-column joint sequentially. The improvement in this embodiment focuses on clamping, centering, and posture screening before cutting.

[0026] The clamping assembly 200 includes a rotary clamping mechanism 220, a drive assembly 210, a radial clamping assembly 240, and a telescopic support arm assembly 230. The rotary clamping mechanism 220's rotary disk 221 is fixed to the mounting location of the rotary cutting machine 100. A central area for arranging the clamping components is formed on the rotary disk 221, and this central area corresponds to the machining center line of the rotary cutting machine 100. Two vertical screws 222 are located on the upper and lower sides of the rotary disk 221, and two horizontal screws 225 are located on the left and right sides of the rotary disk 221. The vertical screws 222 are used to move the clamping components in the vertical direction closer to or away from the beam-column joint, and the horizontal screws 225 are used to move the clamping components in the horizontal direction closer to or away from the beam-column joint.

[0027] Telescopic support arm assemblies 230 are respectively arranged on the upper, lower, left, and right sides of the beam-column joint. Each telescopic support arm assembly 230 includes an outer support arm tube 231, an inner support arm tube 233, and an inclined contact head 232. The inner support arm tube 233 can move along the length of the outer support arm tube 231, and the inclined contact head 232 is located at the end of the inner support arm tube 233 facing the beam-column joint. It should be noted that, in this embodiment, the inclined contact head 232 is a front-end contact portion with an inclined contact surface, and does not perform the material cutting function of the rotary cutter 100. Its function is to contact the surface of the beam-column joint and form relative sliding along the surface.

[0028] The aforementioned relative sliding includes at least the relative movement between the inclined contact head 232 and the beam-column node along the axial direction of the beam-column node; this axial relative movement can occur when the beam-column node enters or exits the machining area, or during the axial detection movement of the clamping assembly 200 relative to the beam-column node. Under the action of elastic stroke, the inclined contact head 232 maintains pre-tight contact with the corresponding side of the beam-column node. When the inclined contact head 232 sweeps to the curved protrusion or partial protrusion of the beam-column node, the corresponding inner tube 233 of the support arm experiences an increase in retraction or movement resistance.

[0029] In this embodiment, the rotary table 221 provides a clamping reference corresponding to the processing coordinates of the rotary cutting machine 100, and the telescopic support arm assembly 230 is used to reflect the posture difference of the beam-column node relative to the clamping reference. Together, they constitute a processing preparation process of first calibrating and then judging, so that the processing centers corresponding to the four cutting stations are established on the same component posture basis.

[0030] Example 2: Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, based on Embodiment 1, the threads of the two vertical screws 222 are in opposite directions, and the threads of the two horizontal screws 225 are in opposite directions. Both vertical screws 222 are rotatably mounted on the rotary table 221 and are threadedly connected to the first pressure plates 227 located on the upper and lower sides, respectively; both horizontal screws 225 are rotatably mounted on the rotary table 221 and are threadedly connected to the second pressure plates 2291 located on the left and right sides, respectively.

[0031] When the two vertical screws 222 rotate in the same direction, the two first pressure plates 227 can move in opposite directions because their threads rotate in opposite directions; when the two horizontal screws 225 rotate in the same direction, the two second pressure plates 2291 can move in opposite directions. Both the first pressure plates 227 and the second pressure plates 2291 are guided and restricted by the rotary table 221, so each pressure plate maintains a clamping posture opposite to the corresponding side of the beam-column node during movement.

[0032] Two radial clamping assemblies 240 are respectively disposed at different transmission positions on the rotary table 221. Each radial clamping assembly 240 includes an annular clamping seat 241 and multiple arc-shaped clamping blocks 247. The annular clamping seat 241 can rotate relative to the rotary table 221, and the arc-shaped clamping blocks 247 are located inside the annular clamping seat 241. The drive motor 211 is fixed on the rotary cutting machine 100, and the friction shaft 212 is connected to the output end of the drive motor 211. The friction shaft 212 passes through the annular clamping seat 241 and forms frictional contact with the arc-shaped clamping blocks 247.

[0033] Two crown gears 223 are respectively fixed on two annular clamping seats 241. One crown gear 223 meshes with a first transmission gear 224 fixed on two vertical screws 222 to drive the vertical clamping direction; the other crown gear 223 meshes with a second transmission gear 226 fixed on two horizontal screws 225 to drive the horizontal clamping direction. After the drive motor 211 is started, the friction shaft 212 rotates and drives the two annular clamping seats 241 to rotate through friction with the arc-shaped clamping block 247, thereby bringing the first pressure plate 227 and the second pressure plate 2291 closer to the beam-column joint.

[0034] The first pressure plate 227 is equipped with a drive roller 229 and a conveyor belt 228. The drive roller 229 is rotatably mounted in the mounting groove of the first pressure plate 227, and the conveyor belt 228 is sleeved between the two drive rollers 229. When a beam-column joint with a rectangular cross-section is placed into the clamping assembly 200, the component can first contact the conveyor belt 228 on the two first pressure plates 227. When the surface of the component is subjected to lateral adjustment, the conveyor belt 228 can rotate around the drive roller 229, reducing the tangential resistance between the first pressure plate 227 and the beam-column joint, so that the beam-column joint still retains the condition to move towards the machining centerline when the second pressure plate 2291 approaches each other.

[0035] When one set of pressure plates has achieved stable contact with the beam-column joint, the screw in that direction will encounter significant resistance to further rotation. Consequently, the rotational resistance of the corresponding annular clamping seat 241 increases, and relative sliding occurs between the friction shaft 212 and the corresponding arc-shaped clamping block 247, limiting further increases in clamping intensity in that direction. The other radial clamping assembly 240 can still obtain rotational force through the friction shaft 212, allowing the other set of pressure plates to continue centering.

[0036] Therefore, the relative sliding between the friction shaft 212 and the arc-shaped clamping block 247 in this embodiment is not only used to prevent overload of the drive motor 211, but also serves as a resistance feedback switching structure during the clamping and centering process. The set of pressure plates that first contact the beam-column node increases the reaction force of the corresponding screw, and the corresponding radial clamping assembly 240 automatically enters the sliding torque-limiting state; the other set of pressure plates that have not made sufficient contact or still need to be centered continues to move driven by the friction shaft 212. In this way, the actual offset direction of the beam-column node is automatically reflected by the contact resistance between the component and the pressure plate, without the need for additional sensors to determine the offset direction, nor is it necessary to set a fixed sequence of actions for the two clamping directions.

[0037] Example 3: Figure 3 and Figure 4 As shown, based on Embodiment 2, the radial clamping assembly 240 is further provided with a radial adjustment box 242, a sliding pressure block 243, a third spring 244, an adjusting bolt 245, and a limiting block 246. The radial adjustment box 242 is fixedly installed on the annular clamping seat 241, the limiting block 246 is slidably installed inside the radial adjustment box 242, the limiting block 246 is fixedly connected to the arc-shaped clamping block 247, the sliding pressure block 243 is also slidably installed inside the radial adjustment box 242, the adjusting bolt 245 is rotatably installed on the radial adjustment box 242 and threadedly connected to the sliding pressure block 243, one end of the third spring 244 is fixed to the sliding pressure block 243, and the other end is fixed to the limiting block 246.

[0038] In the clamping assembly 200, the rotational force transmitted from the friction shaft 212 to the annular clamping seat 241 depends on the contact pressure between the friction shaft 212 and the arc-shaped clamping block 247. When the contact pressure is low, the annular clamping seat 241 may not be able to obtain sufficient transmission capacity before the pressure plate approaches the beam-column joint; when the contact pressure is high, the first pressure plate 227 or the second pressure plate 2291 may continue to press after contacting the beam-column joint, affecting the alignment process of the component in another direction.

[0039] During adjustment, rotating the adjusting bolt 245 causes the sliding pressure block 243 to move radially along the adjusting box 242. The sliding pressure block 243 compresses or releases the third spring 244, which then transmits the force to the limiting block 246. The limiting block 246 then causes the arc-shaped clamping block 247 to change its pressure on the friction shaft 212. In this way, a suitable preload can be applied to the arc-shaped clamping block 247 before clamping, based on the cross-sectional dimensions of the beam-column joint, the component wall thickness, surface condition, and clamping stroke.

[0040] After the preload is set, the friction shaft 212 can drive the annular clamping seat 241 to rotate before the pressure plate contacts the beam-column joint, causing the vertical screw 222 and the horizontal screw 225 to approach each other. When one set of pressure plates contacts the beam-column joint, the reaction force of the component on the screw in that direction gradually increases. After reaching the preset friction transmission capacity, the friction shaft 212 slides relative to the arc-shaped clamping block 247 in that direction, thereby limiting the further increase of clamping force in that direction. The other set of pressure plates can continue to move before reaching the contact resistance, thus completing the centering clamping in the remaining directions.

[0041] Example 4: Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, based on Embodiments 1 to 3, the telescopic support arm assembly 230 further includes a connecting plate 237, a first spring 238, a pressing seat 234, a ball bearing 235, a first magnetic block 236, a second spring 239, and a second magnetic block 2391. The connecting plate 237 is fixed inside the outer tube 231 of the support arm. The first spring 238 is connected between the connecting plate 237 and the inner tube 233 of the support arm. The first magnetic block 236 is fixed on the inner tube 233 of the support arm. The pressing seat 234 is slidably arranged along the outer tube 231 of the support arm. The ball bearing 235 is rolled on the side of the pressing seat 234 facing the beam-column node. The second magnetic block 2391 is fixed on the pressing seat 234, and the second magnetic block 2391 and the first magnetic block 236 are arranged opposite to each other and generate a repulsive force.

[0042] The clamping seat 234 located on one side of the first pressure plate 227 is connected to the first pressure plate 227 via a second spring 239, and the clamping seat 234 located on one side of the second pressure plate 2291 is connected to the second pressure plate 2291 via a second spring 239. When the first pressure plate 227 and the second pressure plate 2291 approach the beam-column joint, the clamping seat 234 moves towards the beam-column joint along with the corresponding pressure plate. The second spring 239 is used to absorb the relative displacement of the pressure plate before and after contacting the member, so that the telescopic support arm assembly 230 still retains a stroke that can be used to trigger the extension and retraction of the inner tube 233 of the support arm after the pressure plate contacts the beam-column joint.

[0043] After the beam-column joint is placed into the clamping assembly 200, the first pressure plate 227 drives the conveyor belt 228 to approach the beam-column joint, and the balls 235 on the clamping seat 234 first contact the surface of the beam-column joint. The balls 235 roll on the surface of the beam-column joint, reducing the drag resistance when the clamping seat 234 moves on the surface of the component. As the first pressure plate 227 or the second pressure plate 2291 continues to approach, the second spring 239 is compressed, the clamping seat 234 moves relative to the outer tube 231 of the support arm, and the second magnetic block 2391 gradually approaches the first magnetic block 236. Under the action of magnetic repulsion, the first magnetic block 236 pushes the inner tube 233 of the support arm to move along the outer tube 231 of the support arm, and the oblique contact head 232 moves towards the surface of the beam-column joint simultaneously.

[0044] After the inclined contact head 232 contacts the surface of the beam-column joint, relative sliding occurs along the surface of the component as the pressure plate continues to form a clamping reference. Because the inclined contact head 232 has an inclined contact surface, locally attached oxide scale, cutting residue, or welding spatter on the component surface can be carried away from the main contact area as the inclined contact head 232 passes through. After the clamping is released, the first spring 238 causes the inner tube 233 of the support arm to return to its initial position, facilitating the use of the same initial position as a reference for the next inspection.

[0045] During the inspection, the operator or control unit obtains the expansion and contraction of the inner tubes 233 of the two supporting arms at different axial positions. Taking the axial position of the beam-column joint as s, the expansion and contraction of the inner tubes 233 of the upper, lower, left, and right supporting arms are denoted as LU(s), LD(s), LL(s), and LR(s), respectively. The difference in vertical expansion and contraction can be denoted as DV(s) = LU(s) - LD(s), and the difference in lateral expansion and contraction can be denoted as DH(s) = LL(s) - LR(s).

[0046] The difference in the expansion and contraction amounts between the upper and lower support arm inner tubes 233 at a single axial position is typically used to indicate a positional difference or local surface anomaly between the upper and lower outer surfaces of the beam-column joint relative to the clamping datum. Only when the difference in expansion and contraction amounts DV(s) between the upper and lower support arm inner tubes 233 exceeds a preset allowable range during the axial movement of the beam-column joint is it determined that the component exhibits a bending tendency or bending interference in the vertical direction. Similarly, for the left and right telescopic support arm assemblies 230, the difference in left and right expansion and contraction amounts DH(s) at a single axial position is used to determine lateral offset or local surface position anomalies. When the difference in left and right expansion and contraction amounts along the axial position exceeds a preset allowable range, it is used to determine that the component exhibits a bending tendency or bending interference in the horizontal direction.

[0047] Since the corresponding clamping direction enters a torsion-limited sliding state after reaching the preset friction transmission capacity, the beam-column joint is not easily subjected to continuously increasing rigid clamping force when the oblique contact head 232 performs telescopic detection. Therefore, the difference in telescopic amount of the inner tube 233 of the support arm mainly reflects the positional difference, bending trend, or local surface positional abnormality of the beam-column joint relative to the clamping reference, and is not easily masked by the elastic deformation of the component caused by over-clamping. In other words, the torsion-limited friction transmission mechanism provides low over-pressure detection conditions for the telescopic support arm assembly 230, while the telescopic support arm assembly 230 provides a basis for the cutting allowance judgment after torsion-limited centering. The two cooperate to complete the centering and detection within the same clamping stroke.

[0048] After determining the difference in telescopic extension and its axial change, if the test results are within the predetermined allowable processing range, the clamping state is maintained and the four-sided cutting process begins; if the test results exceed the allowable processing range, the clamping is released and the beam-column joint is corrected, repositioned, or the component is replaced to avoid directly cutting components with obvious posture deviations on all four sides. By setting the telescopic support arm assembly 230 within the clamping process, the component posture judgment occurs in the clamping stage before processing, without occupying an additional cutting station.

[0049] During overall operation, the beam-column node to be processed is first fed into the processing area of ​​the rotary cutting machine 100, positioning it within the central area of ​​the turntable 221. After starting the drive motor 211, the friction shaft 212 drives the vertical screw 222 and the horizontal screw 225 to rotate via two radial clamping assemblies 240, causing the first pressure plate 227 and the second pressure plate 2291 to move closer to the beam-column node.

[0050] When one of the clamping directions first contacts the beam-column node and reaches the preset friction transmission capacity, the radial clamping assembly 240 in that direction enters a sliding torque-limiting state relative to the friction shaft 212, restricting further pressure in that direction; the other clamping direction continues to move, causing the beam-column node to be aligned with the machining centerline. During the alignment and axial movement, the oblique contact head 232 sweeps along the surface of the beam-column node. The operator or control unit determines whether the beam-column node meets the posture requirements before four-sided cutting based on the difference in the extension and retraction of the inner tubes 233 of the two support arms and their axial changes.

[0051] Overall working principle: During operation, the beam-column joint to be processed is fed into the processing area of ​​the rotary cutting machine 100, and the clamping assembly 200 begins to clamp, center, and determine the posture of the beam-column joint. The rotary clamping mechanism 220 uses the processing center corresponding to the rotary table 221 as the clamping reference, and the drive motor 211 in the drive assembly 210 outputs torque to make the friction shaft 212 rotate.

[0052] After the friction shaft 212 rotates, it generates frictional transmission with the arc-shaped clamping block 247 in the radial clamping assembly 240, causing the annular clamping seat 241 to rotate. When the annular clamping seat 241 rotates, the crown gear 223 moves accordingly, driving the first transmission gear 224 and the second transmission gear 226 to rotate respectively. The first transmission gear 224 causes the vertical screw 222 to rotate, and the vertical screw 222 drives the first pressure plates 227 on the upper and lower sides to move towards each other; the second transmission gear 226 causes the horizontal screw 225 to rotate, and the horizontal screw 225 drives the second pressure plates 2291 on the left and right sides to move towards each other, so that the beam-column joint gradually moves closer to the clamping reference of the rotary table 221.

[0053] When the first pressure plate 227 in the vertical direction contacts the beam-column joint, the conveyor belt 228 can rotate with the drive roller 229, allowing the beam-column joint to have certain micro-motion conditions when continuing to center in the horizontal direction, reducing the tangential resistance between the component and the first pressure plate 227. When the second pressure plate 2291 in the horizontal direction continues to approach, it can push the beam-column joint to adjust towards the machining center line.

[0054] During clamping, when any clamping direction has contacted the beam-column joint and increased the transmission resistance to the preset friction transmission capacity, relative sliding occurs between the arc-shaped clamping block 247 and the friction shaft 212 in that direction, preventing further significant pressure increase in that direction. The other clamping direction can still receive driving force from the friction shaft 212, allowing the corresponding first pressure plate 227 or second pressure plate 2291 to continue completing the centering action. Through this operating mode, the beam-column joint can gradually approach the machining center of the rotary cutting machine 100 before clamping, reducing the offset caused by initial contact on one side.

[0055] The radial adjustment box 242, sliding pressure block 243, third spring 244, adjusting bolt 245, and limiting block 246 are used to adjust the preload pressure of the arc-shaped clamping block 247 on the friction shaft 212. When the adjusting bolt 245 rotates, the position of the sliding pressure block 243 changes, the compression of the third spring 244 changes accordingly, and the force on the limiting block 246 changes, thereby changing the friction transmission capability between the arc-shaped clamping block 247 and the friction shaft 212, so that the clamping force is kept within a range suitable for the current component.

[0056] The telescopic support arm assembly 230 participates in attitude judgment simultaneously during clamping. The outer tube 231 of the support arm provides travel for the extension and retraction of the inner tube 233 of the support arm, and the oblique contact head 232 moves closer to the beam-column joint surface along with the inner tube 233 of the support arm. When the clamping seat 234 approaches the beam-column joint, the ball bearing 235 first contacts and rolls with the component surface, reducing the drag resistance of the clamping seat 234 when moving on the surface. The second spring 239 acts as a buffer during clamping, and the second magnetic block 2391 generates a repulsive force when it approaches the first magnetic block 236, pushing the inner tube 233 of the support arm and the oblique contact head 232 towards the beam-column joint surface. The connecting plate 237 and the first spring 238 provide elasticity for the return of the inner tube 233 of the support arm, so that the inner tube 233 of the support arm can return to its initial state after the detection is completed.

[0057] The first magnetic block 236 and the second magnetic block 2391 are both covered with non-magnetic wear-resistant sheaths. A chip shield is installed on the side of the outer tube 231 of the support arm near the beam-column joint to reduce the adhesion of iron filings or welding spatter to the surface of the magnetic blocks. The relative movement path of the first magnetic block 236 and the second magnetic block 2391 is consistent with the extension and retraction direction of the inner tube 233 of the support arm.

[0058] When the beam-column joint enters or exits the processing area, or moves axially for detection, the oblique contact head 232 sweeps along the surface of the beam-column joint. When the surface of the beam-column joint exhibits protrusions, depressions, offsets, or bends, the extension or retraction of the inner tube 233 of the support arm will change accordingly. Based on the difference in extension or retraction of the inner tubes 233 of the support arm on the upper and lower sides, and the left and right sides, and their axial changes, it can be determined whether the beam-column joint exhibits vertical or horizontal offset, bending tendencies, or local surface anomalies. When the oblique contact head 232 sweeps the surface, it can also remove some of the oxide scale, welding spatter, or cutting residue adhering to the main contact area, reducing their impact on contact judgment.

[0059] Once the beam-column joint is aligned and the test results of the telescopic support arm assembly 230 are within the allowable range, the clamping assembly 200 maintains the clamping state, and the rotary cutting machine 100 then performs indexing cuts on multiple sides of the beam-column joint according to the processing station. If the test results exceed the allowable range, the cutting process is stopped, and the beam-column joint is repositioned, adjusted, or replaced before further processing.

[0060] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0061] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cutting device for prefabricated steel structure beam-column joints, comprising a rotary cutting machine and a clamping assembly disposed in its processing area, characterized in that: The clamping assembly includes: The rotary clamping mechanism includes a rotary table fixedly connected to the rotary cutting machine. The rotary table forms a clamping reference corresponding to the machining center line of the rotary cutting machine, and is provided with two vertical screws for driving the upper and lower side pressure plates to move in opposite directions and two horizontal screws for driving the left and right side pressure plates to move in opposite directions. The drive assembly includes a friction shaft, and two radial clamping assemblies are provided at the friction shaft for frictional transmission with it; Two radial clamping components are respectively driven by a vertical screw and a horizontal screw, so that when the transmission resistance in any clamping direction exceeds the preset friction transmission capacity, the direction can slide relative to the friction axis, and the other clamping direction can continue to be centered. The telescopic support arm assembly is set in pairs on the upper and lower sides and the left and right sides of the beam-column joint. It includes an outer support arm tube, an inner support arm tube that is slidably installed inside the outer support arm tube, and an oblique contact head that is fixedly connected to the inner support arm tube. The beam-column joint offset, bending trend or local surface position abnormality is judged by the difference in the amount of telescopic extension of the relatively set inner support arm tubes during the axial sweeping process.

2. The cutting device for prefabricated steel structure beam-column joints according to claim 1, characterized in that: The two vertical screws have opposite threads and are threadedly connected to the first pressure plates located on the upper and lower sides, respectively. The two transverse screws have opposite threads and are threadedly connected to the second pressure plates located on the left and right sides, respectively. Both the first and second pressure plates are slidably connected to the rotary table, so that the corresponding pressure plates move towards or away from each other when the corresponding screw rotates; the outer tubes of the support arms located on the upper and lower sides move with the corresponding first pressure plates, and the outer tubes of the support arms located on the left and right sides move with the corresponding second pressure plates.

3. The cutting device for prefabricated steel structure beam-column joints according to claim 1, characterized in that: The driving component also includes: A drive motor, the power output end of which is fixedly connected to the friction shaft; Each of the radial clamping assemblies includes: An annular clamping seat is rotatably mounted on a rotary table; Multiple arc-shaped clamping blocks are located inside the annular clamping seat; The friction shaft passes through the annular clamping seat and makes frictional contact with the arc-shaped clamping block.

4. The cutting device for prefabricated steel structure beam-column joints according to claim 3, characterized in that: The rotary clamping mechanism further includes: Two crown gears are respectively fixedly mounted on the two annular clamping seats; One of the crown gears meshes with a first transmission gear fixed on two vertical screws, and the other crown gear meshes with a second transmission gear fixed on two horizontal screws, so that the two radial clamping assemblies drive the vertical clamping direction and the horizontal clamping direction respectively.

5. The cutting device for prefabricated steel structure beam-column joints according to claim 2, characterized in that: The rotary clamping mechanism further includes: Two first pressure plates are provided, each with an installation groove. Two drive rollers are rotatably installed in the installation grooves. The two drive rollers are connected by a conveyor belt. The conveyor belt is used to form a rolling support interface when the first pressure plate contacts the beam-column joint.

6. The cutting device for prefabricated steel structure beam-column joints according to claim 1, characterized in that: The telescopic support arm assembly also includes: The connecting plate is fixed inside the outer tube of the support arm; The first spring is connected between the connecting plate and the inner tube of the support arm.

7. The cutting device for prefabricated steel structure beam-column joints according to claim 6, characterized in that: The inclined contact head is a contact part with an inclined contact surface. In the elastic pre-tightened state, it slides in contact with the corresponding side of the beam-column node. When the beam-column node enters or exits the processing area, or when the clamping assembly moves axially relative to the beam-column node, the inclined contact head sweeps along the surface of the beam-column node and causes the inner tube of the support arm to bulge or retract with the corresponding surface.

8. The cutting device for prefabricated steel structure beam-column joints according to claim 3, characterized in that: The radial clamping assembly further includes: A radial adjustment box is fixed on the annular clamping seat; The limiting block is fixedly connected to the arc-shaped clamping block; The sliding pressure block is slidably connected to the radial adjustment box; The adjusting bolt is threadedly connected to the sliding pressure block and rotatably connected to the radial adjusting box; The third spring, connected between the sliding pressure block and the limiting block, is used to adjust the preload pressure of the arc-shaped clamping block on the friction shaft.

9. The cutting device for prefabricated steel structure beam-column joints according to claim 2, characterized in that: The telescopic support arm assembly also includes: The clamping seat is slidably mounted on the outer tube of the support arm and is connected to the corresponding first or second pressure plate via a second spring. Ball bearings are rolled and mounted on the side of the clamping seat facing the beam-column joint; The first magnetic block is fixed on the inner tube of the support arm; The second magnetic block is fixed on the clamping seat and repels the first magnetic block.

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