Crane hoisting load detection device and method

Abstract

The present invention discloses a crane hoisting load detection device and method, which relates to the technical field of cranes, including a crane support frame, a hoisting machine assembly is installed at the middle position of the guide rail, a cable arrangement assembly is installed inside the hoisting machine assembly, a steel cable passes through the position between two first rotating wheels, then the first rotating wheel bypasses the second roller, and finally bypasses the roller group, when the hoisting machine assembly is winding the steel cable, the second motor starts to work, the output shaft of the second motor drives the third gear to rotate, the third gear drives two guide rods to rotate, the guide rod drives the guide block to move back and forth, the guide block drives the second roller to move back and forth, thereby driving the steel cable to move back and forth along the outer wall of the I-shaped wheel, when the number of steel cable circles on the surface of the I-shaped wheel increases, it will drive the first rotating wheel to move, and the first rotating wheel drives the entire cable arrangement assembly to move, thereby reducing the friction between the steel cable and the first rotating wheel, and then slowing down the surface wear of the steel cable.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and in particular to a crane hoisting load detection device and method. Background Art

[0002] A crane is a multi-action lifting machine that can lift heavy objects vertically and carry them horizontally within a certain range. It is also called an overhead crane, overhead crane, or crane.

[0003] Existing cranes all have maximum load settings, but sometimes some workers will use the crane with overload for convenience and trouble-free, which may cause damage to the crane and even cause safety accidents. For this purpose, a crane winch load detection device and an anti-overload device used in conjunction with it are provided. At the same time, since the existing crane cable is arranged by driving the crane cable to move the guide wheel, this arrangement method will cause friction between the cable and the groove wall of the guide wheel during the arrangement, and this friction will accelerate the wear of the cable. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problem and to propose a crane hoisting load detection device and method.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: comprising a support frame of a crane, a guide rail is fixedly installed on the upper end of the support frame, a winch assembly is installed in the middle position of the guide rail, and a cable assembly is installed inside the winch assembly;

[0006] The cable arrangement assembly includes a guide block, a through hole for cooperating with the cable is opened in the middle position of the guide block, guide rods are slidably installed on both sides of the guide block, sliders are rotatably installed on both sides of the guide rod, a slide rail for cooperating with the slider is arranged in the winch assembly, a driving group is arranged at the end of the guide rod, the lower end of the guide block is located on both sides of the through hole and mounting brackets are fixedly arranged, a heat dissipation assembly is installed inside the mounting bracket, two first rotating wheels for cooperating with the through holes are rotatably installed in the middle position of the two mounting brackets, a baffle is fixedly arranged on the outer wall of one of the sliders, the baffle is slidably connected to the slide rail, and the baffle The lower end of the driving group is fixed with a plurality of sliding rods, the lower end of the driving group is fixed with a fixing plate, the other end of the sliding rod is fixed to the outer wall of the fixing plate, the outer wall of the sliding rod is slidably mounted with a concave block, the middle position of the concave block is rotatably mounted with a second roller, a roller group for cooperating with the second roller is installed inside the winch assembly, a first pressure plate is fixedly arranged on both sides of the concave block, an anti-overweight device is installed between the concave block and the fixing plate, a second pressure plate is fixedly arranged on both sides of the baffle, a return spring is fixedly arranged between the first pressure plate and the second pressure plate, and a pressure sensor is installed between the return spring and the first pressure plate;

[0007] The roller assembly includes a main shaft rotatably connected to the installation box, and a third roller is slidably connected to the outer wall of the main shaft. Since the third roller is slidably connected to the main shaft, the steel rope cannot move away from the third roller;

[0008] The drive group includes a drive box, the guide rod passes through and extends into the drive box, a second gear is fixedly installed at one end of the guide rod located inside the drive box, a third gear used in conjunction with the second gear is rotatably installed inside the drive box, a second motor used in conjunction with the third gear is installed on the outer wall of the drive box, an output shaft of the second motor is fixedly connected to the third gear, and the guide rod is a screw rod;

[0009] In actual application, the steel cable passes through the position between the two first wheels, and then the first wheel bypasses the second roller and finally bypasses the roller group. When the winch assembly is winding the steel cable, the second motor starts working, and the output shaft of the second motor drives the third gear to rotate, and the third gear drives the two guide rods to rotate, and the guide rod drives the guide block to move back and forth, and the guide block drives the second roller to move back and forth, thereby driving the steel cable to move back and forth along the outer wall of the I-shaped wheel. When the number of steel cable turns on the surface of the I-shaped wheel increases, it will drive the first wheel to move, and the first wheel drives the entire cable arrangement assembly to move, thereby reducing the friction between the steel cable and the first wheel, and then slowing down the surface wear of the steel cable.

[0010] Furthermore, the winch assembly includes a mounting plate installed on the upper end of the guide rail, a driving motor is installed on the lower end of the mounting plate, a first gear is installed on the output shaft of the driving motor, a teeth for cooperating with the first gear is provided on the outer wall of the guide rail, a mounting box is installed on the upper end of the mounting plate, a first motor is fixedly arranged on the upper end of the mounting box, the output shaft of the first motor is connected to the central axis of the I-shaped wheel, a steel cable is wrapped around the outer wall of the I-shaped wheel, the cable arrangement assembly is installed inside the mounting box, the slide rail is fixed inside the mounting box, and the winch assembly is also provided with an anti-fall device.

[0011] Further, the heat dissipation component includes an installation cavity provided inside the installation frame, a fan is rotatably installed in the middle position of the installation cavity, a plurality of guide cavities used in conjunction with the fan are provided on a side of the installation cavity close to the first rotating wheel, two groups of first pulleys are fixedly provided at the rotating shaft position of the fan, the rotating shaft of the first rotating wheel passes through and extends into the interior of the installation cavity, a second pulley is installed at the end of the rotating shaft, a one-way bearing is provided between the rotating shaft and the second pulley, the two second pulleys are respectively connected to the first pulley by belts, the diameter of the second pulley is larger than the diameter of the first pulley, an air duct is installed on one side of the installation cavity, a heat dissipation ring used in conjunction with the second motor is installed on the outer wall of the drive box, and the air duct is communicated with the heat dissipation ring;

[0012] In actual application, when the steel cable moves upward, the steel cable drives the two first wheels to rotate, and the two first wheels respectively drive two different second pulleys to rotate, and the two second pulleys rotate forward and reversely. The forward rotating second pulley drives the fan forward, while the reversed second pulley cannot drive the fan to rotate due to the one-way bearing. Similarly, since the diameter of the second pulley is larger than the diameter of the first pulley, the rotation speed of the fan is increased. When the fan rotates, air will be sucked into the installation cavity from the position of the guide cavity. The air in the installation cavity enters the air duct, and then enters the heat dissipation ring from the inside of the air duct, thereby cooling the surface of the second motor.

[0013] The anti-overweight device comprises conductive columns fixedly arranged on the outer walls of both ends of the outer wall of the fixing plate, a through hole used in conjunction with the conductive column is opened in the middle of the first pressing plate, a conductive ring is fixedly arranged at the position of the through hole, and two conductive rings are connected by a wire, one of the conductive columns is connected to the live wire, and the other conductive column is connected to the live wire of the first motor input terminal;

[0014] In actual application, when there is an object installed at the end of the steel cable, the winch assembly starts working and the rope will be retracted. When the rope is retracted, the downward pressure provided by the object will drive the concave block to move, and the concave block will squeeze the reset spring. When the concave block continues to move, the first pressure plate will move along the conductive column. When the object is too heavy, the conductive ring will separate from the conductive column. At this time, since the object has not yet left the ground, it will not cause any danger, thereby preventing workers from using the crane with overweight.

[0015] Furthermore, a processor is installed inside the installation box, a buzzer is installed on the outer wall of the installation plate, the output end of the pressure sensor is connected to the processor, and the output end of the processor is connected to the input end of the buzzer and the display screen.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The steel cable passes through the position between the two first wheels, then the first wheel goes around the second roller, and finally goes around the roller group. When the winch assembly is winding the steel cable, the second motor starts working, the output shaft of the second motor drives the third gear to rotate, the third gear drives the two guide rods to rotate, the guide rod drives the guide block to move back and forth, the guide block drives the second roller to move back and forth, thereby driving the steel cable to move back and forth along the outer wall of the I-shaped wheel. When the number of turns of the steel cable on the surface of the I-shaped wheel increases, it will drive the first wheel to move, and the first wheel drives the entire cable arrangement assembly to move, thereby reducing the friction between the steel cable and the first wheel, and then slowing down the surface wear of the steel cable;

[0018] 2. When an object is installed at the end of the steel cable, the winch assembly starts working and the rope will be retracted. When the rope is retracted, the downward pressure provided by the object will drive the concave block to move, and the concave block will squeeze the reset spring. When the concave block continues to move, the first pressure plate will move along the conductive column. When the object is too heavy, the conductive ring will separate from the conductive column. At this time, since the object has not yet left the ground, it will not cause any danger, thereby preventing workers from using the crane with overweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a crane hoisting load detection device and method proposed by the present invention;

[0020] Figure 2 A schematic diagram of the structure of a hoisting machine component of a crane hoisting load detection device and method proposed by the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of an installation box of a crane hoisting load detection device and method proposed by the present invention;

[0022] Figure 4A schematic diagram of the guide block structure of a crane hoisting load detection device and method proposed by the present invention;

[0023] Figure 5 A schematic diagram of the heat dissipation ring structure of a crane hoisting load detection device and method proposed by the present invention;

[0024] Figure 6 A schematic diagram of the roller assembly structure of a crane hoisting load detection device and method proposed by the present invention;

[0025] Figure 7 A schematic diagram of the concave block structure of a crane hoisting load detection device and method proposed by the present invention;

[0026] Figure 8 A schematic diagram of the fan structure of a crane winch load detection device and method proposed by the present invention.

[0027] In the figure: 1, support frame; 2, guide rail; 3, winch assembly; 301, mounting plate; 302, mounting box; 303, first motor; 304, I-shaped wheel; 305, slide rail; 4, cable assembly; 401, guide block; 402, first rotating wheel; 4021, second pulley; 403, mounting frame; 404, guide rod; 405, slider; 406, baffle; 407, fixing plate; 408, slide rod; 409, concave block; 4091, first pressure plate; 410, roller group; 411, second motor; 412, heat dissipation ring; 413, fan; 414, reset spring; 415, conductive column. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] Reference Figure 1-8 A crane hoisting load detection device and method, comprising a crane support frame 1, a guide rail 2 is fixedly installed on the upper end of the support frame 1, a hoisting machine assembly 3 is installed in the middle position of the guide rail 2, and a cable assembly 4 is installed inside the hoisting machine assembly 3;

[0031] The cable arrangement assembly 4 includes a guide block 401, a through hole for use with a cable is provided in the middle of the guide block 401, guide rods 404 are slidably installed on both sides of the guide block 401, sliders 405 are rotatably installed on both sides of the guide rod 404, a slide rail 305 for use with the slider 405 is provided in the winch assembly 3, a drive group is provided at the end of the guide rod 404, the lower end of the guide block 401 is located on both sides of the through hole and mounting brackets 403 are fixedly provided, a heat dissipation assembly is installed inside the mounting bracket 403, two first rotating wheels 402 for use with the through holes are rotatably installed in the middle of the two mounting brackets 403, a baffle 406 is fixedly provided on the outer wall of one of the sliders 405, the baffle 406 is slidably connected to the slide rail 305, and the baffle 406 A plurality of slide bars 408 are fixedly provided at the lower end, a fixed plate 407 is fixedly provided at the lower end of the driving group, the other end of the slide bar 408 is fixed to the outer wall of the fixed plate 407, a concave block 409 is slidably installed on the outer wall of the slide bar 408, a second roller is rotatably provided at the middle position of the concave block 409, a roller group 410 used in conjunction with the second roller is installed inside the winch assembly 3, first pressing plates 4091 are fixedly provided on both sides of the concave block 409, an anti-overweight device is installed between the concave block 409 and the fixed plate 407, second pressing plates are fixedly provided on both sides of the baffle 406, a reset spring 414 is fixedly provided between the first pressing plate 4091 and the second pressing plate, and a pressure sensor is installed between the reset spring 414 and the first pressing plate 4091;

[0032] The roller assembly 410 includes a main shaft rotatably connected to the installation box 302, and a third roller is slidably connected to the outer wall of the main shaft. Since the third roller is slidably connected to the main shaft, the steel rope cannot move away from the third roller.

[0033] The driving group includes a driving box, a guide rod 404 passes through and extends into the driving box, a second gear is fixedly installed at one end of the guide rod 404 located inside the driving box, a third gear used in conjunction with the second gear is rotatably installed inside the driving box, a second motor 411 used in conjunction with the third gear is installed on the outer wall of the driving box, an output shaft of the second motor 411 is fixedly connected to the third gear, and the guide rod 404 is a screw rod;

[0034] In actual application, the steel cable passes through the position between the two first wheels 402, and then the first wheel 402 bypasses the second roller and finally bypasses the roller group 410. When the winch assembly 3 is winding the steel cable, the second motor 411 starts working, and the output shaft of the second motor 411 drives the third gear to rotate, and the third gear drives the two guide rods 404 to rotate, and the guide rods 404 drive the guide blocks 401 to move back and forth, and the guide blocks 401 drive the second rollers to move back and forth, thereby driving the steel cable to move back and forth along the outer wall of the I-shaped wheel 304. When the number of turns of the steel cable on the surface of the I-shaped wheel 304 increases, it will drive the first wheel 402 to move, and the first wheel 402 drives the entire cable arrangement assembly 4 to move, thereby reducing the friction between the steel cable and the first wheel 402, and then slowing down the surface wear of the steel cable.

[0035] Furthermore, the winch assembly 3 includes a mounting plate 301 installed on the upper end of the guide rail 2, a driving motor is installed on the lower end of the mounting plate 301, a first gear is installed on the output shaft of the driving motor, and teeth for cooperating with the first gear are provided on the outer wall of the guide rail 2. A mounting box 302 is installed on the upper end of the mounting plate 301, a first motor 303 is fixedly arranged on the upper end of the mounting box 302, an output shaft of the first motor 303 is connected to the central axis of the I-shaped wheel 304, a steel cable is wound around the outer wall of the I-shaped wheel 304, the cable arrangement assembly 4 is installed inside the mounting box 302, a slide rail 305 is fixed inside the mounting box 302, and the winch assembly 3 is also provided with an anti-fall device.

[0036] Further, the heat dissipation component includes an installation cavity provided inside the installation frame 403, a fan 413 is rotatably installed in the middle position of the installation cavity, a plurality of guide cavities used in conjunction with the fan 413 are provided on one side of the installation cavity close to the first rotating wheel 402, two sets of first pulleys are fixedly provided at the rotating shaft position of the fan 413, the rotating shaft of the first rotating wheel 402 passes through and extends into the interior of the installation cavity, a second pulley 4021 is installed at the end of the rotating shaft, a one-way bearing is provided between the rotating shaft and the second pulley 4021, the two second pulleys 4021 are respectively connected to the first pulley by belts, the diameter of the second pulley 4021 is larger than the diameter of the first pulley, an air duct is installed on one side of the installation cavity, a heat dissipation ring 412 used in conjunction with the second motor 411 is installed on the outer wall of the drive box, and the air duct is connected to the heat dissipation ring 412;

[0037] In actual application, when the steel cable moves upward, the steel cable drives the two first wheels 402 to rotate, and the two first wheels 402 respectively drive two different second pulleys 4021 to rotate, and the two second pulleys 4021 rotate one forward and one reverse. The forward rotating second pulley 4021 drives the fan 413 to rotate forward, while the reversed second pulley 4021 cannot drive the fan 413 to rotate due to the one-way bearing. Conversely, since the diameter of the second pulley 4021 is greater than the diameter of the first pulley, the rotation speed of the fan 413 is increased. When the fan 413 rotates, air will be sucked into the interior of the installation cavity from the position of the guide cavity. The air in the installation cavity enters the interior of the air duct, and then enters the interior of the heat dissipation ring 412 from the interior of the air duct, thereby cooling the surface of the second motor 411.

[0038] The overweight prevention device includes a fixed plate 407, the outer walls of both ends of which are respectively fixed with conductive posts 415, a through hole for use with the conductive post 415 is provided in the middle of the first pressing plate 4091, a conductive ring is fixedly provided at the position of the through hole, and the two conductive rings are connected by a wire, one of the conductive posts 415 is connected to the live wire, and the other conductive post 415 is connected to the live wire of the incoming line end of the first motor 303;

[0039] In actual application, when an object is installed at the end of the steel cable, the winch assembly 3 starts working and the rope will be retracted. When the rope is retracted, the downward pressure provided by the object will drive the concave block 409 to move, and the concave block 409 will squeeze the reset spring 414. When the concave block 409 continues to move, the first pressure plate 4091 will move along the conductive column 415. When the object is too heavy, the conductive ring will be separated from the conductive column 415. At this time, since the object has not yet left the ground, it will not cause any danger, thereby preventing the staff from using the crane with overweight.

[0040] Furthermore, a processor is installed inside the installation box 302, a buzzer is installed on the outer wall of the installation plate 301, the output end of the pressure sensor is connected to the processor, the output end of the processor is connected to the input end of the buzzer and the display screen, the return spring 414 squeezes the pressure sensor, the pressure sensor transmits data to the processor, and the processor transmits the data to the display screen, thereby detecting the load of the crane in real time.

[0041] Working principle:

[0042] The steel cable passes through the position between the two first rotating wheels 402, and then the first rotating wheel 402 bypasses the second roller, and finally bypasses the roller group 410. When the winch assembly 3 is winding the steel cable, the second motor 411 starts working, and the output shaft of the second motor 411 drives the third gear to rotate, and the third gear drives the two guide rods 404 to rotate, and the guide rods 404 drive the guide blocks 401 to move back and forth, and the guide blocks 401 drive the second rollers to move back and forth, thereby driving the steel cable to move back and forth along the outer wall of the I-shaped wheel 304. When the number of turns of the steel cable on the surface of the I-shaped wheel 304 increases, it will drive the first rotating wheel 402 to move, and the first rotating wheel 402 drives the entire cable arrangement assembly 4 to move, thereby reducing the friction between the steel cable and the first rotating wheel 402, and then slowing down the surface wear of the steel cable;

[0043] When an object is installed at the end of the steel cable, the winch assembly 3 starts working and the rope will be retracted. When the rope is retracted, the downward pressure provided by the object will drive the concave block 409 to move, and the concave block 409 will squeeze the return spring 414. When the concave block 409 continues to move, the first pressure plate 4091 will move along the conductive column 415. When the object is too heavy, the conductive ring will be separated from the conductive column 415. At this time, since the object has not yet left the ground, it will not cause any danger, thereby preventing the staff from using the crane with overweight.

[0044] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A crane hoisting load detection device and method, characterized in that: It comprises a support frame (1) of a crane, a guide rail (2) being fixedly mounted on the upper end of the support frame (1), a hoist assembly (3) being mounted in the middle of the guide rail (2), and a cable arrangement assembly (4) being mounted inside the hoist assembly (3); The cable arrangement assembly (4) comprises a guide block (401), a through hole for cooperating with the cable is provided in the middle of the guide block (401), guide rods (404) are slidably mounted on both sides of the guide block (401), sliders (405) are rotatably mounted on both sides of the guide rods (404), a slide rail (305) for cooperating with the slider (405) is provided in the winch assembly (3), a driving group is provided at the end of the guide rod (404), mounting frames (403) are fixedly mounted on the lower ends of the guide block (401) on both sides of the through hole, a heat dissipation assembly is installed inside the mounting frames (403), two first rotating wheels (402) for cooperating with the through holes are rotatably mounted in the middle of the two mounting frames (403), a baffle (406) is fixedly mounted on the outer wall of one of the sliders (405), and a baffle (406) is fixedly mounted at the lower end of the baffle (406). A plurality of slide bars (408) are arranged, a fixed plate (407) is fixedly arranged at the lower end of the driving group, the other end of the slide bar (408) is fixed to the outer wall of the fixed plate (407), a concave block (409) is slidably installed on the outer wall of the slide bar (408), a second roller is rotatably installed at the middle position of the concave block (409), a roller group (410) used in conjunction with the second roller is installed inside the winch assembly (3), first pressure plates (4091) are fixedly arranged on both sides of the concave block (409), an anti-overweight device is installed between the concave block (409) and the fixed plate (407), a second pressure plate is fixedly arranged on both sides of the baffle (406), a reset spring (414) is fixedly arranged between the first pressure plate (4091) and the second pressure plate, and a pressure sensor is installed between the reset spring (414) and the first pressure plate (4091).

2. A crane hoisting load detection device and method according to claim 1, characterized in that: The hoist assembly (3) comprises a mounting plate (301) mounted on the upper end of the guide rail (2); a driving motor is mounted on the lower end of the mounting plate (301); a first gear is mounted on the output shaft of the driving motor; teeth for matching with the first gear are provided on the outer wall of the guide rail (2); a mounting box (302) is mounted on the upper end of the mounting plate (301); a first motor (303) is fixedly mounted on the upper end of the mounting box (302); an output shaft of the first motor (303) is connected to a central axis of an I-shaped wheel (304); a steel cable is wound around the outer wall of the I-shaped wheel (304); and the cable arrangement assembly (4) is mounted inside the mounting box (302).

3. A crane hoisting load detection device and method according to claim 1, characterized in that: The drive group comprises a drive box, the guide rod (404) passes through and extends into the interior of the drive box, a second gear is fixedly mounted on one end of the guide rod (404) located inside the drive box, a third gear used in conjunction with the second gear is rotatably mounted inside the drive box, a second motor (411) used in conjunction with the third gear is mounted on the outer wall of the drive box, and an output shaft of the second motor (411) is fixedly connected to the third gear.

4. A crane hoisting load detection device and method according to claim 1, characterized in that: The heat dissipation component comprises an installation cavity provided inside the installation frame (403), a fan (413) is rotatably installed in the middle position of the installation cavity, a plurality of guide cavities used in conjunction with the fan (413) are provided on a side of the installation cavity close to the first rotating wheel (402), two groups of first pulleys are fixedly provided at the rotating shaft position of the fan (413), the rotating shaft of the first rotating wheel (402) passes through and extends into the interior of the installation cavity, a second pulley (4021) is installed at the end of the rotating shaft, a one-way bearing is provided between the rotating shaft and the second pulley (4021), the two second pulleys (4021) are connected to the first pulley respectively by belts, the diameter of the second pulley (4021) is larger than the diameter of the first pulley, an air duct is installed on one side of the installation cavity, a heat dissipation ring (412) used in conjunction with the second motor (411) is installed on the outer wall of the drive box, and the air duct is connected to the heat dissipation ring (412).

5. A crane hoisting load detection device and method according to claim 2, characterized in that: The slide rail (305) is fixed inside the installation box (302), a rotating wheel (4051) is rotatably mounted on the lower end of the slider (405), and a ball bearing is mounted at a position where the outer wall of the fixing plate (407) contacts the slide rail (305).

6. A crane hoisting load detection device and method according to claim 1, characterized in that: The anti-overweight device comprises a fixing plate (407) having conductive posts (415) fixedly disposed on the outer walls of both ends of the outer wall, a through hole for use with the conductive post (415) is provided in the middle of the first pressing plate (4091), a conductive ring is fixedly disposed at the position of the through hole, two conductive rings are connected by a wire, one of the conductive posts (415) is connected to a live wire, and the other conductive post (415) is connected to a live wire at the incoming terminal of the first motor (303).

7. A crane hoisting load detection device and method according to claim 2, characterized in that: A processor is installed inside the installation box (302), a display screen is installed at the lower end of the support frame (1), a buzzer is installed on the outer wall of the installation plate (301), the output end of the pressure sensor is connected to the processor, and the output end of the processor is connected to the input end of the buzzer and the display screen.

8. A crane hoisting load detection device and method according to claim 1, characterized in that: The roller assembly (410) comprises a main shaft rotatably connected to the installation box (302), and a third roller is slidably connected to the outer wall of the main shaft.

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