Device and method for detecting broken wire position of tower crane steel wire rope

Abstract

The invention discloses a device and a method for detecting a broken wire position of a tower crane steel wire rope, and relates to the technical field of building equipment. The wire breakage position detection device for the tower crane steel wire rope comprises electrodes which are arranged in pairs; the electrode comprises a disc capable of rotating; the periphery of the disc is fixedly sleeved with an insulating ring body, a first ring groove is formed in the circumferential face of the insulating ring body, and a conducting ring body with a C-shaped section is fixed to the surface of the first ring groove. A conductive sheet body is fixedly installed on the end face of the insulating ring body, and the conductive sheet body and the conductive ring body are connected through a conductive cylinder arranged on the circumferential face of the insulating ring body. And when the steel wire rope is clamped in the first ring groove and is in compression joint with the conductive ring body, the electrode can rotate to adapt to the movement of the steel wire rope. In the invention, the electrode can rotate along with the movement of the steel wire rope, so that the relative slippage between the electrode and the steel wire rope can be reduced, and the problems of abrasion and bounce (namely poor contact) between the electrode and the steel wire rope can be reduced.

Description

Technical Field

[0001] This invention relates to the field of construction equipment technology, specifically to a device and method for detecting the location of broken wires in tower crane wire ropes. Background Technology

[0002] Tower crane wire ropes are made by twisting multiple steel wires into a spiral strand, and they typically bear tensile forces during construction. Wire ropes inevitably age during use, with broken wires being the most common sign of aging, which reduces the rope's tensile strength. While broken wires on the surface of the wire rope are easily visible to the naked eye, broken wires inside the rope are difficult to detect quickly, posing a risk to construction operations.

[0003] Electrical continuity testing is a commonly used testing method: two electrodes with a constant spacing are placed along the length of the steel wire rope, and there is a constant voltage difference between the two electrodes. The steel wire rope can be pulled. When the broken wire moves between the two electrodes, the current flowing through the steel wire rope will decrease because the cross-sectional area of ​​the conductor decreases and the resistance increases. Users can use this to determine whether there is a broken wire in the steel wire rope.

[0004] The surface of the wire rope is relatively rough, and the electrode needs to be pressed against the wire rope to achieve conductivity. If the pressure is too high, it will cause the electrode to wear out faster and reduce its service life; if the pressure is too low, it will cause the electrode to bounce, resulting in poor contact. Summary of the Invention

[0005] In order to overcome the problem of "wear and poor contact at the crimping position between the wire rope and the electrode" in the above-mentioned background technology, the present invention provides a device and method for detecting the broken wire position of tower crane wire rope.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A device for detecting the broken wire position of a tower crane wire rope includes electrodes arranged in pairs. Each electrode includes a rotatable disc. An insulating ring is fixedly sleeved on the outer circumference of the disc. A first annular groove is provided on the circumferential surface of the insulating ring. A conductive ring with a C-shaped cross-section is fixed on the surface of the first annular groove. A conductive plate is fixedly installed on the end face of the insulating ring. The conductive plate and the conductive ring are connected by a conductive cylinder disposed on the circumferential surface of the insulating ring. When the wire rope is engaged in the first annular groove and pressed against the conductive ring, the electrodes can rotate to adapt to the movement of the wire rope.

[0007] As a further optimization of the present invention, there is a constant voltage difference between the two electrodes in a pair, and one of the electrodes is connected to an ammeter.

[0008] As a further optimization of the present invention, it also includes a housing, an electric winch disposed at the top of the inner cavity of the housing, and a rope control module disposed below the electric winch; the top end of the wire rope is connected to the electric winch, and the bottom end is connected to a hook; the rope control module includes a rotating plate, the middle part of the rotating plate is rotatably connected to the housing, and both ends are equipped with first rollers; the wire rope is inserted into the insertion gap between the two first rollers; the circumferential surface of the first roller is provided with a second annular groove adapted to the wire rope; a pair of electrodes are provided obliquely above the rope control module and a pair of electrodes are provided obliquely below the module; when the rotating plate is in a horizontal state, and the vertically arranged wire rope intersects the rotating plate in a cross shape, the wire rope does not contact the first rollers and the electrodes; the rotating plate can rotate to bend the wire rope to form an N-shaped part, and the straight parts at both ends of the N-shaped part are respectively adapted to be pressed onto the upper and lower pairs of electrodes.

[0009] As a further optimization of the present invention, two limiting rollers are provided at the bottom center of the inner cavity of the box, and the two limiting rollers clamp and limit the steel wire rope from both sides.

[0010] As a further optimization of the present invention, two rotating plates are provided and are respectively disposed on both sides of the insertion gap; the middle part of one rotating plate is vertically and fixedly connected to the first output shaft of the first electrode, and the middle part of the other rotating plate is vertically and fixedly connected to a central rotating shaft, the central rotating shaft being coaxially arranged with the first output shaft and disposed on both sides of the insertion gap; the central rotating shaft is connected to a rotary switch; when the N-shaped part is formed, the rotary switch can control the electrode to form a path with the external power supply; when the steel wire rope and the rotating plate cross in a cross shape, the rotary switch can control the electrode to disconnect from the external power supply.

[0011] As a further optimization of the present invention, an electric contact module that contacts the conductive sheet is inserted into the side wall of the housing; the electric contact module includes a mounting sleeve, a telescopic rod that is movably inserted into the end opening of the mounting sleeve, a protrusion fixedly installed at the end of the telescopic rod, and a compression spring disposed in the inner cavity of the mounting sleeve; the protrusion is disposed in the inner cavity of the mounting sleeve, one end of the compression spring abuts against the protrusion, and the other end abuts against the end face of the inner cavity of the mounting sleeve; an insulating sleeve is provided between the housing and the mounting sleeve; the end of the telescopic rod away from the protrusion abuts against the conductive sheet.

[0012] As a further optimization of the present invention, the two electrodes in pairs respectively abut against the two contact modules, and one of the contact modules is electrically connected to the ammeter and the other contact module is electrically connected to the rotary switch.

[0013] As a further optimization of the present invention, the surface of the first roller is provided with an insulating layer.

[0014] As a further optimization of the present invention, a first rotating shaft is inserted into the center of the disk, and a limiting collar is sleeved on the outer periphery of the first rotating shaft. The limiting collar is disposed between the end face of the disk and the side wall of the box.

[0015] A method for detecting the broken wire location of a tower crane wire rope, comprising using a tower crane wire rope broken wire location detection device to detect the broken wire location of the wire rope, the steps of which include: S1, the electric winch stops winding and unwinding the wire rope; S2, the rope control module rotates until the originally vertically positioned wire rope bends into an N-shape, and the straight sections at both ends of the N-shape are respectively fitted and pressed onto the upper and lower pairs of electrodes; S3, the electric winch winds or unwinds the wire rope, causing different parts of the wire rope to pass over the electrodes; the reading of the ammeter is recorded during the process.

[0016] In summary, the present invention has at least one of the following advantages: (1) In this invention, the electrode can rotate with the movement of the wire rope, which can reduce the relative slippage between the electrode and the wire rope, and thus reduce the wear and bounce (i.e. poor contact) problems between the electrode and the wire rope.

[0017] (2) The two electrodes in pairs can roll along the axis of the wire rope, thereby detecting different parts of the wire rope, which improves the comprehensiveness of wire breakage detection and avoids detection blind spots.

[0018] (3) The control rope module can rotate until the wire rope bends to form an N-shaped part, and the straight parts at both ends of the N-shaped part are respectively adapted to be pressed onto the upper and lower pairs of electrodes. Then this patent can bypass the arc part and monitor the current of the straight part, thereby avoiding the current change caused by the bending of the wire rope. This is used to reduce data noise, reduce the difficulty of subsequent data processing (specifically the difficulty of noise reduction), and improve the accuracy of the evaluation results.

[0019] (4) When hoisting goods, the rope control module can rotate to a horizontal state and cross the vertically set wire rope in a cross shape. At this time, the wire rope does not contact the rope control module / electrode, thus avoiding the transmission of pressure. This is used to avoid the problem of overload damage to the rope control module / first motor / electrode / first output shaft.

[0020] (5) The rope control module is connected to the rotary switch; when the rope control module rotates to the horizontal state (i.e., when it is in the state of hoisting goods), the rotary switch is turned off to realize the automatic power-off of the electrode; when the rope control module rotates to form the N-shaped part, the rotary switch is turned on to realize the automatic power-on of the electrode; on the one hand, it reduces the operation steps of the user, improves the convenience and efficiency of the operation, and on the other hand, it plays a role in safety protection.

[0021] (6) Unlike the traditional method of fixing the steel wire rope and moving the electrode, the present invention fixes the electrode and moves the steel wire rope. The fixed position of the contact module and the fixed position of the rotatable electrode can be adapted to contact and conduct electricity, avoiding the problem that the contact module is difficult to move / rotate with the electrode.

[0022] (7) The single-drive control rope module enables the N-shaped part to contact two pairs of electrodes simultaneously, thereby reducing structural complexity, improving transmission reliability and detection accuracy (by performing two independent tests through two pairs of electrodes, collecting two sets of data for comparative analysis, thereby reducing errors and improving accuracy). Attached Figure Description

[0023] The present application will be further explained below with reference to the accompanying drawings: Figure 1 This is a schematic diagram illustrating the detection principle of the present invention; Figure 2 A schematic diagram showing the movement of the steel wire rope to adapt to the rotation of the electrode. Figure 3 This is a top view of the cross section of the electrode structure; Figure 4 A front view diagram showing the wire rope and the rope control module in a cross-shaped intersection state; Figure 5 A front view diagram showing the position and structure of the N-shaped part; Figure 6 A top-view cross-section diagram showing the location and structure of the rope control module; Figure 7 A cross-sectional top view of the contact module and the electrode in contact state; Figure 8 This is a top view of the cross-section of the electric contact module structure; Figure 9 This is a front view diagram showing the electrical connection status between the contact module and the rotary switch.

[0024] Explanation of reference numerals in the attached figures: In the picture, 1. Electrode; 11. Disk; 111. First rotating shaft; 112. Limiting collar; 12. Insulating ring; 121. First annular groove; 13. Conductive ring; 14. Conductive cylinder; 15. Conductive sheet; 2. Ammeter; 3. Steel wire rope; 31. N-shaped section; 311. Straight section; 312. Curved section; 4. Box body; 5. Electric winch; 6. Rope control module; 61. Rotating plate; 62. First roller; 620. Insertion gap; 6200. Second rotating shaft; 621. Second annular groove; 622. Insulation layer; 63. First motor; 631. First output shaft; 64. Central rotating shaft; 65. Rotary switch; 7. Limit rollers; 8. Electro-contact module; 81. Mounting sleeve; 82. Telescopic rod; 83. Protrusion; 84. Compression spring; 85. Insulating sleeve; 9. Wires. Detailed Implementation

[0025] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows: Reference Figure 1 This embodiment provides a device for detecting the location of broken wires in a tower crane wire rope, including two pairs of electrodes 1. Both electrodes 1 can contact and conduct electricity with the wire rope 3, thus forming a circuit (i.e., there is current in the wire rope 3 located between the two electrodes 1). The distance between the two pairs of electrodes 1 is constant, that is, the value of L1 is constant (for example, 20 cm). The wire rope 3 can move along its own length direction. When the broken wire location moves into the space between the two electrodes 1, the cross-sectional area of ​​the conductor decreases sharply and the resistance increases sharply, resulting in a sharp decrease in current. When the broken wire location is removed from the space between the two electrodes 1, the cross-sectional area of ​​the conductor increases sharply and the resistance decreases sharply, resulting in a sharp increase in current. The user can use this to determine whether there is a broken wire in that area of ​​the wire rope 3.

[0026] Reference Figure 1 In traditional technology, electrode 1 is ring-shaped, which causes it to press against and wear against the wire rope 3. To avoid this problem, refer to... Figures 2-9 In this patent, the electrode 1 is circular and can rotate, and the steel wire rope 3 is C-shaped and covers the circumference of the electrode 1. The electrode 1 can adapt to the rotation as the steel wire rope 3 moves (pulls), thus changing sliding into rolling, avoiding the problems of wear of (electrode 1 / steel wire rope 3) and bounce (poor contact) of (steel wire rope 3).

[0027] Reference Figure 2 and Figure 3Electrode 1 includes a rotatable disk 11; an insulating ring 12 (e.g., made of insulating resin material, fixedly connected by bolts or by heat fusion) is fixedly sleeved on the outer periphery of the disk 11; the insulating ring 12 and the disk 11 are coaxially arranged. A first annular groove 121 is provided on the circumferential surface of the insulating ring 12, which is used to fit and hold the steel wire rope 3. A conductive ring 13 is inherently present on the surface of the first annular groove 121 (e.g., fixedly connected by bolts or by heat fusion); a conductive sheet 15 (e.g., fixedly connected by bolts or by heat fusion) is fixedly installed on the end face of the insulating ring 12, and the conductive sheet 15 and the conductive ring 13 are connected by a conductive cylinder 14 provided on the circumferential surface of the insulating ring 12; the conductive cylinder 14 covers and is fixed on the circumferential surface of the insulating ring (e.g., fixedly connected by bolts or by heat fusion). The cross-section of the conductive ring 13 is C-shaped and fits the surface of the first annular groove 121. The conductive ring 13, conductive cylinder 14 and conductive sheet 15 are integrally fixedly connected and all are made of conductive material (e.g., copper sheet).

[0028] Reference Figure 2 and Figure 3 When the wire rope 3 is clamped in the first ring groove 121 and pressed against the conductive ring 13, the electrode 1 can rotate to adapt to the movement (pulling) of the wire rope 3, thereby avoiding relative sliding between the wire rope 3 and the conductive ring 13, and thus avoiding the problems of wear of (electrode 1 / wire rope 3) and bounce (poor contact) of (wire rope 3).

[0029] Reference Figure 1 , Figure 2 and Figure 4 A pair of electrodes 1 are connected by a constant voltage difference (e.g., fixed at 5 volts, 10 volts, or 50 volts), and one of the electrodes 1 is connected to an ammeter 2. The ammeter 2 is used to measure the current in the wire rope 3 (located between the two electrodes 1).

[0030] Reference Figure 4 and Figure 5 It also includes a housing 4, an electric winch 5 located at the top of the inner cavity of the housing 4 (the housing of the electric winch 5 is fixedly connected to the housing 4 by bolts), and a rope control module 6 located below the electric winch 5; the rope control module 6 is located inside the inner cavity of the housing 4. The top of the wire rope 3 is connected to the winding reel of the electric winch 5, and the bottom is connected to a hook (used for lifting goods during construction operations).

[0031] Reference Figure 4 , Figure 5 and Figure 6The rope control module 6 includes a strip-shaped rotating plate 61, which is vertically positioned. The middle of the rotating plate 61 is rotatably connected to the side wall of the housing 4, and both ends are equipped with first rollers 62. The first rollers 62 and the rotating plate 61 are rotatably connected via a second rotating shaft 6200 (and bearings). The circumferential surface of the first rollers 62 is provided with a second annular groove 621 adapted to the wire rope 3. The wire rope 3 is fitted and locked in the second annular groove 621. The first rollers 62 can rotate to adapt to the movement (pulling) of the wire rope 3, thereby improving the smoothness of winding and unwinding of the wire rope 3 (and thus improving the ease of operation), and reducing the wear of the first rollers 62 and the wire rope 3.

[0032] Reference Figures 4-6 A connection gap 620 is provided between the two first rollers 62, and the wire rope 3 is inserted into the connection gap 620 between the two first rollers 62.

[0033] Reference Figure 4 and Figure 5 The rope control module 6 has a pair of electrodes 1 located diagonally above and a pair of electrodes 1 located diagonally below. The four electrodes 1 are arranged in a parallelogram shape and are used to adapt to and contact the two parallel straight sections 311 on the N-shaped section 31 (to form a passage).

[0034] Reference Figure 4 During the hoisting operation of the wire rope 3 (i.e., when hoisting heavy objects): when the rotating plate 61 rotates to a horizontal position and the vertically arranged wire rope 3 intersects the rotating plate 61 in a cross shape, the wire rope 3 is inserted into the middle of the insertion gap 620 and does not contact the first roller 62 or the electrode 1. In this state, the wire rope 3 does not contact the rope control module 6, which on the one hand prevents friction and reduces wear on the wire rope 3 / rope control module 6, thereby extending the service life of the invention; on the other hand, it avoids the generation of the N-shaped part 31 (in conjunction with...). Figure 5 Then the wire rope 3 and the weight will not move towards the rope control module 6 and the first motor 63 (in combination). Figure 6 Applying torque will not apply pressure to the first rotating shaft 111, thereby avoiding overload damage to the rope control module 6, the first motor 63 and the first rotating shaft 111, and extending the service life of the invention.

[0035] Reference Figure 5During the inspection of the wire rope 3: the rotating plate 61 can rotate (with the center position of the rotating plate 61 as the center) until the wire rope 3 bends to form an N-shaped part 31, and the straight parts 311 at both ends of the N-shaped part 31 are respectively adapted to be pressed onto the upper and lower pairs of electrodes 1 (under the action of tension: the part of the wire rope 3 between the electric winch 5 and the rope control module 6, the part between the two first rollers 62, and the part between the rope control module 6 and the limit roller 7 respectively form a straight part 311; the wire rope 3 at the position of the two first rollers 62 respectively forms an arc part 312, and both ends of the arc part 312 are connected to the end of the straight part 311). In this state, the electric winch 5 needs to continuously reel in / unwind the wire to move the N-shaped section 31 to different parts of the wire rope 3, thereby improving the comprehensiveness of wire breakage detection. However, the wire rope 3 at the junction of the straight section 311 and the curved section 312 will deform (e.g., from straight to bent or from bent to straight). This will cause deformation and displacement of the wires inside the wire rope 3 (i.e., the two wires that were originally in lateral contact become separated, or the two wires that were originally separated become in contact). This will cause changes in the cross-sectional area, resistance, and current of the conductor at this position. Therefore, if the two electrodes 1 are installed at the positions of the two first rollers 62 respectively, unnecessary changes in current value data will be collected (i.e., the accuracy of data acquisition will be reduced). The unnecessary changes in current value data will act as noise and adversely affect the subsequent data analysis (i.e., increase the difficulty of data analysis, reduce the accuracy of analysis results, and reduce the accuracy of wire breakage location assessment). In contrast, this patent places the paired electrodes 1 at the straight portions 311 at both ends of the N-shaped portion 31, thus avoiding the problem of the steel wire rope 3 bending and affecting the accuracy of the detection results.

[0036] Reference Figure 5 If the paired electrodes 1 are placed at the straight section 311 between the two first rollers 62, the rotating plate 61 and the electrodes 1 will interfere and get stuck, making it difficult for the rope control module 6 to rotate.

[0037] The N-shaped part 31 is set at an angle.

[0038] Reference Figure 4 and Figure 5 Two limiting rollers 7 are provided at the bottom center of the inner cavity of the housing 4. The two limiting rollers 7 clamp the limiting steel wire rope 3 from both sides and can be adapted to form the N-shaped part 31. The limiting rollers 7 are rotatably connected to the side wall of the housing 4 through a third rotating shaft (and bearing) to reduce the friction of the steel wire rope 3 during movement.

[0039] Reference Figure 6Two rotating plates 61 are provided and are respectively located on both sides of the insertion gap 620; the two rotating plates 61 are arranged axially symmetrically; the two rotating plates 61 are arranged parallel to each other to form an insertion gap 620 with a uniform width, so that the steel wire rope 3 can be located in the middle of the insertion gap 620 without contacting the rotating plates 61 (i.e., to avoid leakage); the middle part of one rotating plate 61 is vertically fixedly connected to the first output shaft 631 of the first electrode 1 (for example, by bolts); the output shaft of the first motor 63 is inserted into the through hole in the side wall of the housing 4 and connected by bearings; the housing of the first motor 63 is fixedly connected to the outer side wall of the housing 4 by bolts; the middle part of the other rotating plate 61 is vertically fixedly connected to a central rotating shaft 64, which is coaxially arranged with the first output shaft 631 and is located on both sides of the insertion gap 620 (to avoid entanglement with the steel wire rope 3).

[0040] Reference Figure 6 The central rotating shaft 64 is connected to the rotary switch 65. When the rotating plate 61 rotates, it drives the central rotating shaft 64 to rotate, thereby controlling the opening and closing of the rotary switch 65. When the N-shaped part 31 is formed, the rotary switch 65 can control the connection between the electrode 1 and the external power supply (that is, the control rope module 6 controls the wire rope 3 to contact the electrode 1 while simultaneously turning on the rotary switch 65 to supply power to the electrode 1, thereby improving the degree of automation and reducing manual operation); when the wire rope 3 and the rotating plate 61 are in a cross shape, the rotary switch 65 can control the disconnection between the electrode 1 and the external power supply (that is, the wire rope 3 is released from contact with the electrode 1 while simultaneously stopping the power supply to the electrode 1, which on the one hand improves the degree of automation and reduces manual operation, and on the other hand provides safety protection). The central rotating shaft 64 is inserted into the through hole in the side wall of the housing 4 and connected by a bearing; the housing of the rotary switch 65 is fixedly connected to the outer side wall of the housing 4 by bolts.

[0041] Reference Figure 7 and Figure 8 An electric contact module 8 is inserted into the side wall of the housing 4 and presses against the conductive sheet 15. The electric contact module 8 includes a mounting sleeve 81, a telescopic rod 82 movably inserted into the end opening of the mounting sleeve 81, a protrusion 83 fixedly installed at the end of the telescopic rod 82, and a compression spring 84 disposed in the inner cavity of the mounting sleeve 81. The protrusion 83 is disposed in the inner cavity of the mounting sleeve 81, and one end of the compression spring 84 abuts against the protrusion 83 and the other end abuts against the end face of the inner cavity of the mounting sleeve 81. An insulating sleeve is provided between the housing 4 and the mounting sleeve 81. The end of the telescopic rod 82 away from the protrusion 83 abuts against the conductive sheet 15 to achieve conductivity.

[0042] Reference Figure 3 , Figure 7 and Figure 8When the steel wire rope 3 moves and drives the electrode 1 to rotate, the compression spring 84 pushes the telescopic rod 82 to maintain a pressed state with the conductive sheet 15; the conductive sheet 15 has a circular sheet structure and is coaxially arranged with the first rotating shaft 111 to ensure stable contact between the telescopic rod 82 and the conductive sheet 15.

[0043] Reference Figure 8 and Figure 9 Electrode 1 and contact module 8 are in one-to-one correspondence, and electrode 1 and its corresponding contact module 8 are in contact to achieve conductivity.

[0044] Reference Figure 8 and Figure 9 The two electrodes 1 in pairs are respectively connected to the two contact modules 8. Of the two electrodes 1 in pairs: one contact module 8 is electrically connected to the ammeter 2 (i.e., wire 9), and the other contact module 8 is electrically connected to the rotary switch 65 (i.e., wire 9); the ammeter 2 is electrically connected to the neutral or ground wire of the external power supply (i.e., wire 9); and the rotary switch 65 is electrically connected to the live wire of the external power supply (i.e., wire 9).

[0045] Reference Figure 5 Taking the pair of electrodes 1 above the rope control module 6 as an example: when the knob switch 65 is turned on, the current flows through one electrode 1 into the part of the wire rope 3 to be tested, and then flows out through the other electrode 1. The wire rope 3 at the position of the electric winch 5 and the wire rope 3 at the position of the first roller 62 are short-circuited and not energized, thereby improving the detection accuracy and safety.

[0046] Reference Figure 8 The mounting sleeve 81, telescopic rod 82, and protrusion 83 are all made of conductive materials (such as copper-containing metal). The protrusion 83 contacts the mounting sleeve 81 to achieve conductivity; the mounting sleeve 81 is connected to the wire 9 to achieve conductivity. The insulating sleeve is made of resin-impregnated paper sleeve, which is fixedly connected to the housing 4 and the mounting sleeve 81 by bolts.

[0047] An insulating layer 622 (e.g., rubber, ceramic, or resin material, fixedly connected by adhesive or bolts) is fixedly connected to the surface of the first roller 62; the middle part of the insulating layer 622 is adapted to fit the surface of the second annular groove 621, thereby preventing the formation of a conductive path between the wire rope 3 and the second roller and avoiding leakage problems.

[0048] Reference Figure 3 and Figure 7 A first rotating shaft 111 is inserted into the center of the disc 11. A limiting collar 112 is sleeved on the outer periphery of the first rotating shaft 111. The limiting collar 112 is located between the end face of the disc 11 and the side wall of the box 4, and is used to match the positions of the first ring groove 121 and the second ring groove 621 to prevent the wire rope 3 from coming out of the first ring groove 121 / second ring groove 621.

[0049] Reference Figure 4 and Figure 5 In traditional technology, the wire rope 3 is usually kept vertical (for ease of hoisting operations), and the electrode 1 is positioned to the side of the wire rope 3 and moved laterally (the lateral movement controls the contact / disconnection between the electrode 1 and the wire rope 3, thereby controlling the circuit / circuit). The electrode 1 is soldered to the wire 9 to achieve conductivity, and the soldering does not affect the lateral movement of the electrode 1. However, in this patent, the electrode 1 needs to rotate, so soldering is not applicable. Therefore, a contact module 8 needs to be added between the electrode 1 and the wire 9. However, the contact module 8 needs to be installed on the side wall of the housing 4 and cannot move laterally with the electrode 1. Therefore, this patent adopts a fixed position for the electrode 1 and drives the wire rope 3 to bend and move to control the contact / disconnection between the electrode 1 and the wire rope 3, thereby controlling the circuit / circuit.

[0050] A method for detecting the broken wire location of a tower crane wire rope, comprising using a tower crane wire rope broken wire location detection device to detect the broken wire location of the wire rope 3, and the steps including: S1. The electric winch 5 stops winding and unwinding the wire rope 3, removes the cargo from the hook, and hangs the counterweight on the hook (the counterweight is a lead block with a mass of 1-5 kg, used to apply downward tension to the bottom of the wire rope 3, thereby straightening the wire rope 3; specifically, it is used to straighten the straight section 311 later and when the wire rope 3 and the rope control module 6 are crossed in a cross shape).

[0051] S2. The first motor 63 drives the rope control module 6 to rotate, so that the originally vertical steel wire rope 3 bends to form an N-shaped part 31, and the straight parts 311 at both ends of the N-shaped part 31 are respectively adapted to be pressed onto the upper and lower pairs of electrodes 1; during the process, the rotary switch 65 is opened synchronously, so that the paired electrodes 1 and the measured part of the straight part 311 directly form a circuit.

[0052] S3. The electric winch 5 retracts or releases the wire rope 3, causing different parts of the wire rope 3 to pass between the two paired electrodes 1 (i.e., the measured part of the straight section 311); during this process, the reading of the ammeter 2 is recorded; then the ammeter 2 is analyzed to assess whether the location of the current change meets the judgment criteria for wire breakage defects. For wire rope 3 determined to have wire breakage defects, the location of the wire breakage is determined by the time point of occurrence of the wire breakage defect and the retracting / releasing speed of the electric winch 5.

[0053] S4. The electric winch 5 stops winding and unwinding the wire rope 3; then the first motor 63 drives the rope control module 6 to rotate in the opposite direction until it is horizontal. During the process, the N-shaped part 31 deforms into a vertical shape and is arranged in a cross shape with the rope control module 6. Then the wire rope 3 no longer contacts or rubs with the electrode 1 and the rope control module 6 (to avoid overload damage to the first shaft 111, the first electrode 1 and the rope control module 6 during the hoisting operation); then the counterweight is removed from the hook and the goods are hung on the hook for hoisting operation.

[0054] The present invention also includes an electrical cabinet, and the electrical cabinet and the ammeter 2 are both fixedly mounted on the outer surface of the housing 4 by bolts; the ammeter 2, the first motor 63, and the electric winch 5 are respectively connected to the electrical cabinet by wires 9 and signal lines; the electrical cabinet is connected to the external power supply and the external controller (such as a computer or PLC programmable logic controller) by wires 9 and signal lines, respectively. The external controller controls the start and stop of the first motor 63 and the winding / unwinding speed of the electric winch 5 through the electrical cabinet, and performs current data reception and calculation.

[0055] The first motor 63 is a controllable motor (such as a servo motor or a stepper motor). The controllable motor is controlled by an external controller that inputs electrical signals to it, which can control the motor's speed, number of revolutions per rotation, rotation angle per rotation, and start / stop timing.

[0056] The present invention has a simple structure and reliable function. The electrode 1 can rotate with the movement of the wire rope 3, which can reduce the relative slippage between the electrode 1 and the wire rope 3, and thus reduce the wear and bounce problems between the electrode 1 and the wire rope 3.

[0057] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In conclusion, for those skilled in the art, any changes, modifications, substitutions, or variations made to this invention based on the guidance of this invention, without departing from the principles and spirit of this invention, still fall within the protection scope of this invention.

Claims

1. A device for detecting the location of broken wires in a tower crane wire rope, characterized in that: The device includes two electrodes (1) arranged in pairs; each electrode (1) includes a rotatable disk (11); an insulating ring (12) is fixedly sleeved on the outer periphery of the disk (11), and a first annular groove (121) is provided on the circumferential surface of the insulating ring (12), and a conductive ring (13) with a C-shaped cross-section is fixed on the surface of the first annular groove (121); a conductive sheet (15) is fixedly installed on the end face of the insulating ring (12), and the conductive sheet (15) and the conductive ring (13) are connected by a conductive cylinder (14) provided on the circumferential surface of the insulating ring (12); When the wire rope (3) is locked in the first annular groove (121) and pressed against the conductive ring (13), the electrode (1) can rotate to adapt to the movement of the wire rope (3).

2. The device for detecting the broken wire position of a tower crane wire rope according to claim 1, characterized in that: There is a constant voltage difference between the two electrodes (1) in a pair, and one of the electrodes (1) is connected to an ammeter (2).

3. The device for detecting the broken wire position of a tower crane wire rope according to claim 2, characterized in that: It also includes a housing (4), an electric winch (5) located at the top of the inner cavity of the housing (4), and a rope control module (6) located below the electric winch (5); the top of the wire rope (3) is connected to the electric winch (5), and the bottom is connected to a hook; The rope control module (6) includes a rotating plate (61), the middle of which is rotatably connected to the box (4), and both ends are equipped with first rollers (62); the wire rope (3) is inserted into the insertion gap (620) between the two first rollers (62); The first roller (62) has a second annular groove (621) adapted to the wire rope (3) on its circumferential surface; the rope control module (6) has a pair of electrodes (1) on its upper side and a pair of electrodes (1) on its lower side. When the rotating plate (61) is in a horizontal state and the vertically arranged steel wire rope (3) intersects the rotating plate (61) in a cross shape, the steel wire rope (3) does not contact the first roller (62) and the electrode (1); The rotating plate (61) can rotate to bend the wire rope (3) into an N-shaped part (31), and the straight parts (311) at both ends of the N-shaped part (31) are respectively adapted to be pressed onto the upper and lower pairs of electrodes (1).

4. The device for detecting the broken wire position of a tower crane wire rope according to claim 3, characterized in that: The inner cavity of the box (4) is provided with two limiting rollers (7) at the bottom center, and the two limiting rollers (7) clamp the steel wire rope (3) from both sides.

5. The device for detecting the broken wire position of a tower crane wire rope according to claim 4, characterized in that: Two rotating plates (61) are provided and are respectively located on both sides of the insertion gap (620); the middle part of one rotating plate (61) is vertically fixedly connected to the first output shaft (631) of the first electrode (1), and the middle part of the other rotating plate (61) is vertically fixedly connected to a central rotating shaft (64). The central rotating shaft (64) is coaxially arranged with the first output shaft (631) and is located on both sides of the insertion gap (620); the central rotating shaft (64) is connected to a rotary switch (65). When the N-shaped part (31) is constructed, the rotary switch (65) can control the connection between the electrode (1) and the external power supply. When the wire rope (3) and the rotating plate (61) cross each other in a cross shape, the rotary switch (65) can control the disconnection between the electrode (1) and the external power supply.

6. The device for detecting the broken wire position of a tower crane wire rope according to claim 5, characterized in that: The side wall of the housing (4) is fitted with an electric contact module (8) that contacts the conductive sheet (15); the electric contact module (8) includes a mounting sleeve (81), a telescopic rod (82) that is movably inserted into the end opening of the mounting sleeve (81), a protrusion (83) fixedly installed at the end of the telescopic rod (82), and a compression spring (84) disposed in the inner cavity of the mounting sleeve (81); the protrusion (83) is disposed in the inner cavity of the mounting sleeve (81), one end of the compression spring (84) abuts against the protrusion (83), and the other end abuts against the end face of the inner cavity of the mounting sleeve (81); an insulating sleeve is provided between the housing (4) and the mounting sleeve (81); the end of the telescopic rod (82) away from the protrusion (83) abuts against the conductive sheet (15).

7. The device for detecting the broken wire position of a tower crane wire rope according to claim 6, characterized in that: The two electrodes (1) in pairs abut against the two contact modules (8) respectively, and one of the contact modules (8) is electrically connected to the ammeter (2) and the other contact module (8) is electrically connected to the rotary switch (65).

8. The device for detecting the broken wire position of a tower crane wire rope according to claim 7, characterized in that: The surface of the first roller (62) is provided with an insulating layer (622).

9. The device for detecting the broken wire position of a tower crane wire rope according to claim 8, characterized in that: A first rotating shaft (111) is inserted into the center of the disc (11), and a limiting collar (112) is sleeved on the outer periphery of the first rotating shaft (111). The limiting collar (112) is located between the end face of the disc (11) and the side wall of the box (4).

10. A method for detecting the location of broken wires in a tower crane wire rope, characterized in that, The method of detecting the broken wire position of the tower crane wire rope (3) using the broken wire position detection device of claim 9 includes the following steps: S1. The electric winch (5) stops winding up and unwinding the wire rope (3); S2. The rope control module (6) rotates until the originally vertically arranged steel wire rope (3) bends to form an N-shaped part (31), and the straight parts (311) at both ends of the N-shaped part (31) are respectively adapted to be pressed onto the upper and lower pairs of electrodes (1); S3. The electric winch (5) retracts or releases the wire rope (3), causing different parts of the wire rope (3) to pass over the electrode (1); during the process, the reading of the ammeter (2) is recorded.

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