Electric induction device for suspension arm and crane

Abstract

The invention provides a suspension arm electrical induction device and a crane, and relates to the technical field of cranes. The electric induction device for the suspension arm comprises a shell, a round shell is fixedly connected to one side of the outer surface of the shell, a winding wheel is installed in the round shell, a steel wire rope is wound around the outer surface of the winding wheel and penetrates through the round shell and the shell, and a volute spiral spring assembly is detachably and fixedly connected to one side of the outer surface of the round shell. The volute spiral spring assembly is matched with the winding wheel; the interior of the shell is fixedly connected with a counting detection roller, and the steel wire rope is wound on the counting detection roller by one circle. And the counting detection roller is arranged, so that the steel wire rope is wound for one circle in a single layer, and nonlinear errors caused by radius difference in traditional multi-layer winding are eliminated. The linear displacement of the steel wire rope and the rotation angle of the limiting roller are in a strict linear relation, the detection precision of the telescopic length of the suspension arm is remarkably improved, and the defect of inaccurate measurement caused by multi-layer winding of the line concentration wheel in the prior art is overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cranes, in particular to a hoist arm electrical induction device and a crane. BACKGROUND

[0002] A crane is a mechanical device used for vertical or horizontal transportation of heavy objects, widely used in construction, port, manufacturing and other fields. It realizes the lifting, moving and precise positioning of heavy objects through pulleys, steel wires, hydraulic systems and other components. Common types include tower cranes, bridge cranes, truck cranes, etc., with the characteristics of strong lifting capacity and wide operation range, and is an indispensable heavy lifting tool in modern industry.

[0003] At present, during the lifting process of the crane, a pull rope type sensor is used on the hoist arm to detect the extension length of the hoist arm. The principle is to count the number of turns and the angle of the sensor to calculate the release or retraction amount of the cable. However, since the length measuring cable needs to be wound in multiple layers on the collecting wheel, and the radius of the different winding layers and the main shaft axis is different, the linear displacement of the cable and the rotation angle of the collecting wheel are in a nonlinear relationship. This nonlinear characteristic will introduce measurement error, thereby reducing the accuracy of the hoist arm extension length detection.

[0004] Therefore, we have developed a new kind of hoist arm electrical induction device and crane. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the shortcomings of the prior art, the present application provides a hoist arm electrical induction device and a crane, which solves the problem that the pull rope type sensor of the existing crane hoist arm causes the linear displacement and the rotation angle of the collecting wheel to be in a nonlinear relationship due to the multi-layer winding of the length measuring cable, thereby introducing measurement error and reducing the detection accuracy of the hoist arm extension length.

[0007] (II) Technical solutions

[0008] In order to achieve the above purpose, the present application is realized by the following technical solutions: a hoist arm electrical induction device, comprising a shell, a circular shell fixedly connected to one side of the outer surface of the shell, a winding wheel installed in the circular shell, a steel wire wound on the outer surface of the winding wheel, the steel wire penetrating through the circular shell and the shell, a volute spring assembly fixedly connected to one side of the outer surface of the circular shell, and the volute spring assembly matched with the winding wheel;

[0009] The inside of the shell is fixedly connected with a counting detection roller, and the steel wire is wound around the counting detection roller once;

[0010] The inside of the shell is fixedly installed with a horizontal moving assembly, the movable end of the horizontal moving assembly is fixedly installed with a clamping assembly, the clamping assembly is matched with the steel wire rope, the side inner wall of the shell is fixedly installed with a distance measuring assembly, and the distance measuring assembly is matched with the movable end of the horizontal moving assembly.

[0011] The outer surface of the steel wire rope is provided with a plurality of guide plates, the end of the steel wire rope is fixedly connected with a connecting angle steel, and the bottom of the connecting angle steel is fixedly connected with a fixing seat.

[0012] The inside of the shell is fixedly installed with a controller.

[0013] Preferably, the winding wheel comprises a winding shaft, the winding shaft is arranged through the circular shell and rotationally connected with the circular shell, a spline hole is formed in one end of the winding shaft, two side plates are fixedly connected with the outer surface of the winding shaft in a symmetrical manner, and the steel wire rope is wound on the winding shaft and located between the two side plates.

[0014] Through the above technical scheme, the setting of the side plates can prevent the steel wire rope from deviating or unwinding during winding, ensure the winding to be neat, and reduce friction and wear.

[0015] Preferably, the volute spring assembly comprises a spline shaft, the spline shaft is matched with the spline hole, one end of the spline shaft is fixedly connected with a mounting shaft, the outer surface of the mounting shaft is rotationally sleeved with a mounting plate, one side of the outer surface of the mounting plate is fixedly connected with a cover, and the inner wall of the cover and the outer surface of the mounting shaft are fixedly connected with a volute spring body.

[0016] Through the above technical scheme, the volute spring body provides a stable winding force, ensures that the steel wire rope is always tensioned, and avoids measurement errors caused by relaxation.

[0017] Preferably, a plurality of connecting bolts are uniformly arranged on one side of the outer surface of the mounting plate and extend through the other side, and a plurality of screw holes are uniformly formed on one side of the outer surface of the circular shell and matched with the connecting bolts.

[0018] Through the above technical scheme, the volute spring assembly can be separated only by dismounting the connecting bolts, which is convenient for maintenance or replacement.

[0019] Preferably, the counting detection roller comprises an encoder, the encoder is fixedly installed on the inner wall of one side of the shell, the input shaft of the encoder is fixedly connected with a limiting roller, the steel wire rope is wound on the limiting roller, the other end of the limiting roller is provided with a first bearing seat, the seat body of the first bearing seat is fixedly connected with the shell, and the bearing inner ring of the built-in bearing of the first bearing seat is fixedly connected with the limiting roller.

[0020] Through the above technical solutions, single-layer winding ensures that the displacement of the wire rope corresponds strictly linearly with the rotation of the limiting roller, eliminating the error of multi-layer winding; the first bearing seat provides stable rotational support and reduces the rotational friction of the limiting roller.

[0021] Preferably, the lateral movement assembly includes a motor, which is fixedly mounted on one side of the inner wall of the housing. The drive end of the motor is fixedly connected to a lead screw, and a slide is threaded onto the outer surface of the lead screw. The slide slides against the inner wall of the housing. One end of the lead screw is provided with a second bearing seat, and the seat of the second bearing seat is fixedly connected to the housing. The inner ring of the bearing inside the second bearing seat is fixedly connected to the lead screw.

[0022] Through the above technical solutions, the second bearing housing reduces the rotational resistance of the lead screw, improves motor efficiency, and extends service life.

[0023] Preferably, the clamping assembly includes an electrically operated parallel gripper, which is fixedly mounted on one end of the slide, and both clamping ends of the electrically operated parallel gripper are fixedly connected to clamping rods.

[0024] Through the above technical solutions, the electric gripper can precisely control the clamping force, ensuring that the wire rope does not slip during the self-inspection process and improving the calibration accuracy.

[0025] Preferably, the ranging component includes a mounting block, which is fixedly mounted on the inner wall of one side of the housing, and a laser ranging sensor is fixedly connected to the outer surface of the mounting block.

[0026] With the above technical solution, laser measurement is not affected by mechanical vibration or ambient light, and is suitable for complex working conditions of cranes.

[0027] Preferably, each of the outer surfaces of the plurality of guide plates has a guide hole extending to the other side, and the guide hole is matched with the wire rope.

[0028] The above technical solution uses guide holes to constrain the path of the wire rope, preventing it from swinging or tangling, and ensuring accurate measurement data.

[0029] A crane includes an electric sensing device for the boom and a crane body. The boom of the crane body is composed of multiple telescopic sections. The electric sensing device for the boom is fixedly installed on the initial telescopic section, and the fixed base is fixedly installed on the end telescopic section. Excluding the end telescopic section, the remaining multiple telescopic sections are respectively fixedly connected to adjacent guide plates.

[0030] (III) Beneficial Effects

[0031] This invention provides an electrical induction device for a crane boom and a crane. It has the following beneficial effects:

[0032] 1. This boom electrical induction device and crane, by setting up a counting detection roller, ensures that the wire rope is wound in a single layer, eliminating the nonlinear error caused by radius differences in traditional multi-layer winding. The linear displacement of the wire rope has a strictly linear relationship with the rotation angle of the limit roller, significantly improving the detection accuracy of the boom extension length and overcoming the measurement inaccuracies caused by multi-layer winding of the conductor wheel in existing technologies.

[0033] 2. The boom electrical sensing device and crane, through the lateral movement component driving the clamping component to clamp the wire rope, and in conjunction with the distance measuring component monitoring the displacement of the slide in real time, form a closed-loop detection system. This system can periodically perform self-checks on the counting detection roller: when the clamping component clamps the wire rope and moves it, if there is a deviation between the rotation signal detected by the encoder and the linear displacement fed back by the laser distance measuring sensor, a calibration program is automatically triggered to ensure the measurement accuracy of the counting detection roller and avoid long-term error accumulation caused by mechanical wear or signal drift;

[0034] 3. The boom electrical induction device and crane adopt a split-type structural design. The spiral spring assembly can be quickly disassembled and assembled via a splined shaft and splined hole. The cover and the round shell are fixed with connecting bolts, facilitating individual spring replacement. The guide plate is fixed to each telescopic section in sections, allowing the installation position of the device to be flexibly adjusted according to the boom structure. This design reduces maintenance complexity, extends equipment service life, and is especially suitable for cranes with multi-section telescopic booms. Attached Figure Description

[0035] Figure 1 This is a perspective view of the present invention;

[0036] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0037] Figure 3 This is a perspective view of the spiral spring of the present invention;

[0038] Figure 4 This is a sectional perspective view of the spiral spring of the present invention;

[0039] Figure 5 This is a cross-sectional view of the circular shell of the present invention;

[0040] Figure 6 This is a cross-sectional view of the housing of the present invention;

[0041] Figure 7 This is a perspective view of the counting and detection roller of the present invention;

[0042] Figure 8 This is a schematic diagram of the ranging component structure of the present invention.

[0043] The components include: 1. Crane body; 2. Cover; 3. Shell; 4. Guide plate; 5. Guide hole; 6. Wire rope; 7. Connecting angle steel; 8. Fixed seat; 9. Splined shaft; 10. Mounting plate; 11. Scroll spring body; 12. Mounting shaft; 13. Connecting bolt; 14. Screw hole; 15. Splined hole; 16. Winding shaft; 17. Round shell; 18. Side plate; 19. Controller; 20. Limit roller; 21. Encoder; 22. Clamping rod; 23. Electric parallel gripper; 24. Motor; 25. Mounting block; 26. Slide; 27. Lead screw; 28. Second bearing seat; 29. ​​First bearing seat; 30. Laser rangefinder sensor. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] like Figure 5 As shown, this embodiment of the invention provides an electric induction device for a boom, including a housing 3. A circular shell 17 is fixedly connected to one side of the outer surface of the housing 3. A winding wheel is installed inside the circular shell 17. A steel wire rope 6 is wound around the outer surface of the winding wheel. The winding wheel includes a winding shaft 16, which passes through the circular shell 17 and is rotatably connected to the circular shell 17. A spline hole 15 is opened at one end of the winding shaft 16 located in the circular shell 17. Two side plates 18 are symmetrically fixedly connected to the outer surface of the winding shaft 16. The steel wire rope 6 is wound on the winding shaft 16 and located between the two side plates 18. The side plates 18 are laser-cut from Q235 steel plates and are symmetrically fixed to both sides of the winding shaft 16 by welding to ensure that the steel wire rope 6 is wound neatly and to avoid overlapping friction.

[0046] Figure 3 , Figure 4 , Figure 5As shown, the wire rope 6 passes through the circular shell 17 and the housing 3. A spiral spring assembly is detachably fixed to one side of the outer surface of the circular shell 17. The spiral spring assembly matches the winding wheel. The spiral spring assembly includes a spline shaft 9, which matches the spline hole 15. One end of the spline shaft 9 is fixedly connected to a mounting shaft 12. A mounting plate 10 is rotatably sleeved on the outer surface of the mounting shaft 12. A cover 2 is fixedly connected to one side of the outer surface of the mounting plate 10. The inner wall of the cover 2 and the outer surface of the mounting shaft 12 are fixedly connected to the spiral spring body 11. A plurality of connecting bolts 13 are evenly provided on one side of the outer surface of the mounting plate 10, extending to the other side. A plurality of screw holes 14 are evenly provided on one side of the outer surface of the circular shell 17, and the screw holes 14 match the connecting bolts 13. The spiral spring body 11 is made of 60Si2MnA material and has a preload of 50 N·m.

[0047] Figure 6 , Figure 7 As shown, a counting detection roller is fixedly connected inside the housing 3, and a steel wire rope 6 is wound around the counting detection roller. The counting detection roller includes an encoder 21, which is fixedly installed on one side of the inner wall of the housing 3. The input shaft of the encoder 21 is fixedly connected to a limit roller 20, and the steel wire rope 6 is wound around the limit roller 20. The other end of the limit roller 20 is provided with a first bearing seat 29, and the seat of the first bearing seat 29 is fixedly connected to the housing 3. The inner ring of the bearing inside the first bearing seat 29 is fixedly connected to the limit roller 20. The encoder 21 is an incremental photoelectric encoder with the model number E6B2-CWZ6C. It is directly connected to the limit roller 20 through a coupling. The surface of the limit roller 20 is covered with polyurethane rubber to increase the friction coefficient with the steel wire rope 6.

[0048] Figure 6 , Figure 8As shown, a lateral moving assembly is fixedly installed inside the housing 3. A clamping assembly is fixedly installed on the movable end of the lateral moving assembly, and the clamping assembly matches the wire rope 6. A ranging assembly is fixedly installed on one inner wall of the housing 3, and the ranging assembly matches the movable end of the lateral moving assembly. The lateral moving assembly includes a motor 24, and the motor 24 is fixedly installed on one inner wall of the housing 3. The motor 24 is a 57 stepper motor, model 57HS22, with a matching driver. A lead screw 27 is fixedly connected to the drive end of the motor 24. A slide 26 is threaded onto the outer surface of the lead screw 27, and the slide 26 slides against the inner wall of the housing 3. One end is provided with a second bearing seat 28, and the seat of the second bearing seat 28 is fixedly connected to the housing 3. The inner ring of the bearing inside the second bearing seat 28 is fixedly connected to the lead screw 27. The clamping assembly includes an electric parallel gripper 23, which is model MHZ2-16D. The electric parallel gripper 23 is fixedly installed at one end of the slide 26. Both clamping ends of the electric parallel gripper 23 are fixedly connected with clamping rods 22. The ranging assembly includes a mounting block 25, which is fixedly installed on one side of the inner wall of the housing 3. A laser ranging sensor 30 is fixedly connected to the outer surface of the mounting block 25.

[0049] Figure 2 As shown, multiple guide plates 4 are fitted on the outer surface of the wire rope 6. Each guide plate 4 has a guide hole 5 extending through to the other side on one side of its outer surface. The guide hole 5 matches the wire rope 6. The cooperation between the guide plate 4 and the guide hole 5 can prevent the wire rope 6 from swinging and reduce measurement noise caused by vibration or wind. A connecting angle steel 7 is fixedly connected to the end of the wire rope 6. A fixing seat 8 is fixedly connected to the bottom of the connecting angle steel 7. The connecting angle steel 7 and the fixing seat 8 are fixed by bolts, which facilitates disassembly and assembly.

[0050] Figure 6 As shown, a controller 19 is fixedly installed inside the housing 3. The controller 19 is electrically connected to the encoder 21, the driver of the motor 24, the electric parallel gripper 23 and the laser rangefinder 30, respectively, and is used to receive detection signals and control the actions of each actuator.

[0051] like Figure 1 , Figure 2 As shown, a crane includes a boom electrical sensing device and a crane body 1. The boom of the crane body 1 is composed of multiple telescopic sections. The boom electrical sensing device is fixedly installed on the initial telescopic section, and a fixed base 8 is fixedly installed on the end telescopic section. Excluding the end telescopic section, the remaining telescopic sections are respectively fixedly connected to adjacent guide plates 4. The boom electrical sensing device is fixed to the initial telescopic section boom by four M16 bolts. During boom extension and retraction, the controller 19 outputs a length signal to the crane's main control system in real time. When the detected length exceeds a set value (e.g., ±5% of the rated stroke), the power supply to the hydraulic pump station is immediately cut off.

[0052] Wire rope 6-line length measurement:

[0053] The wire rope 6 is wound only once on the limit roller 20 of the counting and detection roller, ensuring that the linear displacement of the wire rope 6 corresponds strictly linearly to the rotation angle of the limit roller 20. When the boom extends or retracts, the wire rope 6 is pulled out or retracted, driving the limit roller 20 to rotate. The encoder 21 records the number of rotations and angle in real time, and the controller 19 calculates the displacement (formula: displacement = circumference of the limit roller × number of rotations).

[0054] Closed-loop self-test and calibration:

[0055] After the motor 24 starts, it drives the lead screw 27 to rotate, causing the slide 26 to move along the axis of the lead screw 27. At the same time, the electric parallel gripper 23 closes, clamping the wire rope 6 through the clamping rod 22, which will pull the wire rope 6 to move.

[0056] The laser rangefinder 30 monitors the displacement of the slide block 26 in real time and records it as L1. The encoder 21 synchronously records the displacement converted from the rotation of the limit roller 20 (recorded as L2). If [L1-L2] exceeds the threshold, the controller 19 determines that there is a deviation and triggers a calibration program: using the ranging value of the laser rangefinder 30 as a reference, the encoder 21 parameters are dynamically corrected to ensure the accuracy of subsequent measurements.

[0057] Self-test trigger conditions: can be automatically started by timed intervals (e.g., every 24 hours) or by the number of boom extensions / retractions (e.g., every 100 times).

[0058] Scroll spring tension control:

[0059] The spiral spring body 11 is linked to the winding shaft 16 via the spline shaft 9, always applying a constant winding force (e.g., 50N) to the wire rope 6. When the boom extends, the wire rope 6 is pulled out, and the spring stores energy; when the boom retracts, the spring releases energy and automatically winds up the wire rope 6 to prevent slack.

[0060] The cover 2 and the round shell 17 can be separated by removing the connecting bolt 13, and the scroll spring body 11 can be directly replaced without disassembling the entire device.

[0061] Crane boom synchronous detection:

[0062] Guide plates 4 are fixed to each telescopic section of the boom (except the end section), and guide holes 5 constrain the path of wire rope 6. When the boom extends or retracts, each section moves synchronously, causing the corresponding guide plates 4 to shift. Only the end of the wire rope 6 is anchored to the fixed seat 8 through the connecting angle steel 7, ensuring that the total elongation of the wire rope 6 is consistent with the total telescopic amount of the boom. Specific implementation examples:

[0064] When the boom extends, the end telescopic joint pulls the wire rope 6, the limit roller 20 rotates counterclockwise, the encoder 21 counts, and the controller 19 displays the length in real time; at the same time, the transverse component performs a periodic self-check.

[0065] When the boom retracts, the spiral spring body 11 retracts the wire rope 6, the limit roller 20 rotates clockwise, the encoder 21 counts down, and the length data is dynamically updated.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A boom electrical induction device, comprising a housing (3), characterized in that: A circular shell (17) is fixedly connected to one side of the outer surface of the housing (3). A winding wheel is installed inside the circular shell (17). A steel wire rope (6) is wound around the outer surface of the winding wheel. The steel wire rope (6) passes through the circular shell (17) and the housing (3). A spiral spring assembly is detachably fixedly connected to one side of the outer surface of the circular shell (17). The spiral spring assembly is matched with the winding wheel. The inside of the housing (3) is fixedly connected to a counting detection roller, and the steel wire rope (6) is wound around the counting detection roller once; A transverse component is fixedly installed inside the housing (3). A clamping component is fixedly installed at the movable end of the transverse component, and the clamping component is matched with the wire rope (6). A ranging component is fixedly installed on one inner wall of the housing (3), and the ranging component is matched with the movable end of the transverse component. The outer surface of the wire rope (6) is fitted with multiple guide plates (4), and the end of the wire rope (6) is fixedly connected to a connecting angle steel (7). The bottom of the connecting angle steel (7) is fixedly connected to a fixing seat (8). The controller (19) is fixedly installed inside the housing (3).

2. The boom electrical induction device according to claim 1, characterized in that: The winding reel includes a winding shaft (16), which passes through the circular shell (17) and is rotatably connected to the circular shell (17). The winding shaft (16) has a spline hole (15) at one end of the circular shell (17). Two side plates (18) are symmetrically fixedly connected to the outer surface of the winding shaft (16), and the wire rope (6) is wound on the winding shaft (16) and located between the two side plates (18).

3. The boom electrical induction device according to claim 2, characterized in that: The spiral spring assembly includes a spline shaft (9) and a spline hole (15) matching the spline shaft (9). One end of the spline shaft (9) is fixedly connected to a mounting shaft (12). A mounting plate (10) is rotatably sleeved on the outer surface of the mounting shaft (12). A cover (2) is fixedly connected to one side of the outer surface of the mounting plate (10). The inner wall of the cover (2) and the outer surface of the mounting shaft (12) are jointly fixedly connected to the spiral spring body (11).

4. The boom electrical induction device according to claim 3, characterized in that: The mounting plate (10) has a plurality of connecting bolts (13) evenly distributed on one side of its outer surface, extending to the other side. The round shell (17) has a plurality of screw holes (14) evenly distributed on one side of its outer surface, and the screw holes (14) match the connecting bolts (13).

5. The boom electrical induction device according to claim 1, characterized in that: The counting detection roller includes an encoder (21), and the encoder (21) is fixedly installed on the inner wall of one side of the housing (3). The input shaft of the encoder (21) is fixedly connected to a limit roller (20), and the wire rope (6) is wound on the limit roller (20). The other end of the limit roller (20) is provided with a first bearing seat (29), and the seat of the first bearing seat (29) is fixedly connected to the housing (3). The inner ring of the bearing built into the first bearing seat (29) is fixedly connected to the limit roller (20).

6. The boom electrical induction device according to claim 1, characterized in that: The transverse component includes a motor (24), which is fixedly installed on the inner wall of one side of the housing (3). The drive end of the motor (24) is fixedly connected to a lead screw (27). A slide (26) is threaded onto the outer surface of the lead screw (27), and the slide (26) slides against the inner wall of the housing (3). One end of the lead screw (27) is provided with a second bearing seat (28), and the seat of the second bearing seat (28) is fixedly connected to the housing (3). The inner ring of the bearing in the second bearing seat (28) is fixedly connected to the lead screw (27).

7. The boom electrical induction device according to claim 6, characterized in that: The clamping assembly includes an electric parallel gripper (23), which is fixedly installed at one end of the slide (26), and both clamping ends of the electric parallel gripper (23) are fixedly connected to a clamping rod (22).

8. The boom electrical induction device according to claim 7, characterized in that: The ranging component includes a mounting block (25), which is fixedly mounted on the inner wall of one side of the housing (3). A laser ranging sensor (30) is fixedly connected to the outer surface of the mounting block (25).

9. The boom electrical induction device according to claim 1, characterized in that: Each of the guide plates (4) has a guide hole (5) on one side of its outer surface that extends to the other side, and the guide hole (5) is matched with the wire rope (6).

10. A crane, comprising a boom electrical induction device according to any one of claims 1 to 9, and a crane body (1), characterized in that, The boom of the crane body (1) is composed of multiple telescopic sections. The boom electrical induction device is fixedly installed on the initial telescopic section, and the fixed seat (8) is fixedly installed on the end telescopic section. After removing the end telescopic section, the remaining multiple telescopic sections are fixedly connected to the adjacent guide plates (4).

Images