A cable retracting device suitable for overhead crane electromagnetic suction cup

Abstract

A cable retracting device suitable for an electromagnetic suction cup of an overhead crane comprises a cable retracting part, a tension sensing part, a vertical plate, a retracting and measuring part and a rope-drawing distance sensor; the cable retracting and releasing part is arranged on the overhead crane platform; the vertical plate and the rope-drawing distance sensor are both arranged at the bottom end of the overhead crane platform, and the rope end of the rope-drawing distance sensor is connected to the top surface of the electromagnetic suction cup directly below it; the tension sensing part and the retracting and measuring part are both arranged on the vertical plate; the signal output end of the rope-drawing distance sensor is connected to the signal input end of the CPU. The utility model effectively reduces the pulling force on the cable while ensuring that the cable can smoothly supply power to the electromagnetic suction cup, thereby extending the service life of the cable.

Description

Technical Field

[0001] The utility model relates to a cable retracting device, in particular to a cable which can be retracted and released synchronously with the rise and fall of an electromagnetic chuck of an overhead crane and can reduce the cable pulling stress to the maximum extent, belonging to the technical field of overhead crane magnetic chuck cable retracting and releasing equipment. Background Art

[0002] The electromagnetic chuck is an electromagnetic clamp that absorbs the target object through the suction force generated by the chuck body after the electromagnetic coil is energized. In the factory, the electromagnetic chuck can be set on the overhead crane, which is driven by the overhead crane to move it. After the electromagnetic chuck absorbs the object, it is driven by the overhead crane to transfer it and unload it after moving to the designated location. It is a common material transfer method in the workshop. The magnetic force of the electromagnetic chuck is provided by electricity. After the current passes through the electromagnetic coil, a magnetic field is generated to absorb the metal material. The power of the electromagnetic chuck under the overhead crane is transmitted by a cable. This cable is wound in a drum on the overhead crane. The drum provides reverse torque through a torsion spring to ensure that there is a reverse recovery force on the cable. When When the electromagnetic suction cup moves downward, the drum is forced to rotate forward to release the cable. As the electromagnetic suction cup moves downward, when the electromagnetic suction cup moves upward, the reverse force of the torsion spring drives the cable to be recovered into the drum. In this process, the cable is continuously subjected to a large pulling force. After long-term use, the cable is seriously damaged, which can easily cause the damaged cable line to be exposed or even broken. Once the cable is damaged, the electromagnetic suction cup stops working and the repair time is long, which seriously affects the production progress. Therefore, a cable retracting and releasing device is needed, which is required to be able to cooperate with the lifting and lowering of the electromagnetic suction cup to perform adaptive retracting and releasing processing on the cable, and ensure that the pulling force on the cable is as small as possible, thereby extending the service life of the cable. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a cable retracting and releasing device suitable for an electromagnetic chuck of an overhead crane, which can effectively reduce the pulling force exerted on the cable on the electromagnetic chuck, thereby extending the service life of the cable.

[0004] The problem described in the utility model is solved by the following technical solutions:

[0005] A cable retracting device suitable for an electromagnetic suction cup of an overhead crane comprises a cable retracting portion, a tension sensing portion, a vertical plate, a retracting and releasing measuring portion and a rope-pull type distance sensor; the cable retracting and releasing portion is arranged on an overhead crane platform; the vertical plate and the rope-pull type distance sensor are both arranged at the bottom end of the overhead crane platform, and the rope end of the rope-pull type distance sensor is connected to the top surface of the electromagnetic suction cup directly below it; the tension sensing portion and the retracting and releasing measuring portion are both arranged on the vertical plate; and the signal output end of the rope-pull type distance sensor is connected to the signal input end of a CPU.

[0006] The cable retracting device suitable for the electromagnetic suction cup of the overhead crane, the cable retracting part includes a vertical plate, a reel, and a servo motor; the number of the vertical plates is two, and they are arranged opposite to each other on the overhead crane platform, and the reel is axially connected between the vertical plates on both sides; the housing of the servo motor is arranged on the side wall of the vertical plate, and the output shaft of the servo motor is connected to the end of the reel, and the cable is wound on the reel; the signal input end of the servo motor is connected to the signal output end of the CPU.

[0007] The above-mentioned cable retracting and releasing device suitable for the electromagnetic suction cup of the overhead crane, the tension sensing part includes a fixed roller, a first U-shaped frame, a movable roller, a guide plate, a support plate, a spring and an infrared ranging sensor; the number of the fixed rollers is two, and one end of the fixed roller is axially connected to the vertical plate, and the two fixed rollers are arranged vertically; the support plate is arranged on the vertical plate, and it is located at the height of the center point of the connection line of the two fixed rollers; the two ends of the movable roller are axially connected to the two ends of the inner wall of the first U-shaped frame; a guide plate is arranged on the outer wall of the first U-shaped frame, a guide hole is arranged on the support plate, and the guide plate is inserted into the guide hole of the support plate; a spring is arranged between the support plate and the first U-shaped frame; an infrared ranging sensor is arranged on the outer wall of the first U-shaped frame, and the infrared emitting end of the infrared ranging sensor points to the support plate; the signal output end of the infrared ranging sensor is connected to the signal input end of the CPU.

[0008] The above-mentioned cable retracting and releasing device suitable for the electromagnetic suction cup of the overhead crane, the retracting and releasing measuring part includes two measuring mechanisms, and the two measuring mechanisms are both arranged on the vertical plate through a bracket; the measuring mechanism is located directly below the vertical plate; the measuring mechanism includes a second U-shaped frame and a clamping roller; the second U-shaped frame is arranged on the vertical plate through a bracket; the two ends of the clamping roller are axially connected to the two ends of the inner wall of the second U-shaped frame; a plurality of rubber strips are evenly arranged on the circumferential side wall of the clamping roller; an angular velocity sensor is arranged at the end of the outer wall of the second U-shaped frame, and it is connected to the end of the clamping roller; the signal output end of the angular velocity sensor is connected to the signal input end of the CPU.

[0009] The cable retracting and releasing device applicable to the electromagnetic suction cup of the overhead traveling vehicle is provided with a guide ring, and the guide ring is arranged on the vertical plate through a bracket, and the guide ring is located between the vertical plate and the clamping roller.

[0010] The above-mentioned cable retracting and releasing device suitable for the electromagnetic suction cup of the overhead crane, the cable end on the drum contacts the upper fixed roller, the movable roller and the lower fixed roller from top to bottom in sequence, then passes through the guide ring, and then passes through the gap between the two clamping rollers to be connected to the terminal box on the electromagnetic suction cup; the movable roller contacts and presses on the outer wall of the cable, and the movable roller supports the cable so that it contacts and presses on the two fixed rollers; the cable is clamped in the middle by the clamping rollers on both sides.

[0011] The utility model retracts and releases the cable through the cable retracting and releasing part, so that the cable can be adaptively retracted and released following the lifting and lowering of the electromagnetic suction cup, and the electromagnetic suction cup can be smoothly powered while ensuring that the pulling force of the cable is low; the pulling tension of the cable can be sensed in real time through the tension sensing part; the retracting and releasing distance of the cable can be sensed in real time through the retracting and releasing measuring part, and thus the lifting and lowering distance of the electromagnetic suction cup can be accurately adapted; the lifting and lowering distance parameters of the electromagnetic suction cup can be monitored in real time through the pull-rope distance sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0013] Figure 2 It is a partial enlarged structural schematic diagram of the utility model A.

[0014] The list of numbers in the figure is: 1. vertical plate, 2. vertical plate, 3. reel, 4. servo motor, 5. fixed roller, 6. first U-shaped frame, 7. moving roller, 8. guide plate, 9. support plate, 10. infrared ranging sensor, 11. guide ring, 12. pull-rope distance sensor, 13. electromagnetic suction cup, 14. second U-shaped frame, 15. clamping roller. DETAILED DESCRIPTION

[0015] See also Figure 1 and Figure 2 The utility model includes a cable retracting and releasing part, a tension sensing part, a vertical plate 1, a retracting and releasing measuring part and a rope-pull type distance sensor 12; the cable retracting and releasing part is arranged on the overhead traveling platform; the cable retracting and releasing part is used to retract and release the cable so that it can adapt to the lifting and lowering of the electromagnetic suction cup and move adaptively; the vertical plate 1 and the rope-pull type distance sensor 12 are both arranged at the bottom end of the overhead traveling platform, and the rope end of the rope-pull type distance sensor 12 is connected to the top surface of the electromagnetic suction cup 13 directly below it; the rope-pull type distance sensor 12 can monitor the position of the electromagnetic suction cup 13 in real time; the tension sensing part and the retracting and releasing measuring part are both arranged on the vertical plate 1; the tension sensing part can monitor the tension of the cable in real time to avoid the cable being torn off due to excessive tension; the signal output end of the rope-pull type distance sensor 12 is connected to the signal input end of the CPU.

[0016] The cable retracting and releasing part includes a vertical plate 2, a reel 3, and a servo motor 4; there are two vertical plates 2, which are oppositely arranged on the overhead crane platform, and the reel 3 is axially connected between the vertical plates 2 on both sides; the cable is wound around the reel 3, and the servo motor 4 can drive the reel 3 to rotate, thereby driving the cable to be retracted and released; the housing of the servo motor 4 is arranged on the side wall of the vertical plate 2, and the output shaft of the servo motor 4 is connected to the end of the reel 3, and the cable is wound around the reel 3; the signal input end of the servo motor 4 is connected to the signal output end of the CPU.

[0017] The tension sensing part includes a fixed roller 5, a first U-shaped frame 6, a movable roller 7, a guide plate 8, a support plate 9, a spring and an infrared ranging sensor 10; the number of the fixed rollers 5 is two, and one end of the fixed roller 5 is axially connected to the vertical plate 1, and the two fixed rollers 5 are arranged vertically; the upper fixed roller 5 is located directly above the lower fixed roller 5; the support plate 9 is arranged on the vertical plate 1, and it is located at the height of the center point of the connection line of the two fixed rollers 5; the two ends of the movable roller 7 are axially connected to the two ends of the inner wall of the first U-shaped frame 6; a guide plate 8 is provided on the outer wall of the first U-shaped frame 6, and a guide hole is provided on the support plate 9, and the guide plate 8 is inserted into the guide hole of the support plate 9; the guide plate 8 provides guidance for the displacement of the first U-shaped frame 6, so that the movable roller 7 can reliably approach the central node of the two fixed rollers 5 or move away; thereby, the cable is clamped in the middle by the fixed rollers and the movable rollers on both sides, and when the tension of the cable is too large, it will drive the movable roller 7 is close to the support plate 9. When the cable tension is small, the movable roller 7 can easily push the cable. At this time, the movable roller 7 is away from the support plate 9, and the cable tension can be indirectly known by the change in the distance between the first U-shaped frame 6 and the support plate 9; when the distance between the first U-shaped frame 6 and the support plate 9 is small, it means that the cable tension is large and the cable needs to be released to reduce the tension; a spring is arranged between the support plate 9 and the first U-shaped frame 6; the spring provides the movable roller 7 with a force to touch and press on the cable, and the cable tension is used to counteract the force of the spring. When the cable tension is too large, the length of the spring will be compressed, thereby reducing the distance between the first U-shaped frame 6 and the support plate 9; an infrared distance sensor 10 is arranged on the outer wall of the first U-shaped frame 6, and the infrared transmitting end of the infrared distance sensor 10 points to the support plate 9; the infrared distance sensor 10 is used to monitor the distance between the first U-shaped frame 6 and the support plate 9 in real time; the signal output end of the infrared distance sensor 10 is connected to the signal input end of the CPU.

[0018] The retractable and retractable measuring part includes two measuring mechanisms, and both measuring mechanisms are arranged on the vertical plate 1 through a bracket; the measuring mechanism is located directly below the vertical plate 1; the measuring mechanism includes a second U-shaped frame 14 and a clamping roller 15; the second U-shaped frame 14 is arranged on the vertical plate 1 through a bracket; the two ends of the clamping roller 15 are axially connected to the two ends of the inner wall of the second U-shaped frame 14; the cable is clamped between the clamping rollers 15 on both sides, and when the cable moves vertically, it will drive the clamping rollers 15 to rotate synchronously. Since the circumference of the clamping roller 15 is known, the angular velocity sensor can know the number of rotations and the rotation direction of the clamping roller 15, and the real-time The length of the retractable and retractable line of the cable can be known; a plurality of rubber strips are evenly arranged on the circumferential side wall of the clamping roller 15; the rubber strips can increase the friction between the clamping roller 15 and the outer wall of the cable, thereby ensuring that the clamping roller 15 can reliably follow the vertical movement of the cable for adaptive rotation, and the displacement length of the cable can be known by the rotation position and number of turns of the clamping roller 15; an angular velocity sensor is arranged on the outer wall end of the second U-shaped frame 14, and is connected to the end of the clamping roller 15; the angular velocity sensor monitors the rotation position and number of turns of the clamping roller 15 in real time; the signal output end of the angular velocity sensor is connected to the signal input end of the CPU.

[0019] A guide ring 11 is provided, and the guide ring 11 is set on the vertical plate 1 through a bracket, and the guide ring 11 is located between the vertical plate 1 and the clamping roller 15; the guide ring 11 is used to correct the position of the cable to ensure that it can smoothly pass through the gap between the fixed roller and the movable roller and the gap between the clamping rollers 15 on both sides to avoid deviation.

[0020] The cable end on the reel 3 contacts the upper fixed roller 5, the movable roller 7 and the lower fixed roller 5 in sequence from top to bottom, then passes through the guide ring 11, and then passes through the gap between the two clamping rollers 15 to be connected to the terminal box on the electromagnetic suction cup 13; the movable roller 7 contacts the outer wall of the cable, and the movable roller 7 supports the cable so that it contacts and presses on the two fixed rollers 5; the different tensions of the cables determine the different positions of the movable roller 7; the cable is clamped in the middle by the clamping rollers 15 on both sides.

[0021] The model of the CPU module in the present utility model is 87C196KC.

[0022] Principle of actual use: the pull-rope distance sensor 12 monitors the vertical take-off and landing state of the electromagnetic suction cup in real time, and the servo motor 4 is used to drive the reel 3 to rotate, and then reel in and release the cable; the length of the cable retracted and released can be known through the cooperation of the clamping roller 15 and the angular velocity sensor, and then the lifting and lowering of the electromagnetic suction cup can be adapted for adaptive retraction and release, ensuring that the cable can reliably power the electromagnetic suction cup; in this process, once the cable tension is too large, that is, when the pulling force is too large, it will straighten, and then push the moving roller close to the support plate 9. When the infrared ranging sensor senses that the distance is too close, it means that the cable is straightened to a large extent at this time, indicating that the cable tension is large. At this time, the servo motor 4 accelerates the rotation to release the cable, thereby alleviating the problem of excessive cable tension; this process is a dynamic process. Under normal conditions, the servo motor 4 and the angle sensor cooperate with the retracted and released cable to cooperate with the lifting and lowering of the electromagnetic suction cup. Only when the infrared ranging sensor 10 senses that the distance is too close, that is, when the cable tension is too large, the servo motor accelerates the speed of releasing the cable; ensuring that the cable tension is maintained within a reasonable range, thereby extending its service life.

Claims

1. A cable retracting device suitable for an electromagnetic chuck of an overhead crane, characterized in that: The invention comprises a cable retractable part, a tension sensing part, a vertical plate (1), a retractable measuring part and a rope-drawing distance sensor (12); the cable retractable part is arranged on the overhead travelling platform; the vertical plate (1) and the rope-drawing distance sensor (12) are both arranged at the bottom end of the overhead travelling platform, and the rope end of the rope-drawing distance sensor (12) is connected to the top surface of an electromagnetic suction cup (13) directly below the rope-drawing distance sensor (12); the tension sensing part and the retractable measuring part are both arranged on the vertical plate (1); and the signal output end of the rope-drawing distance sensor (12) is connected to the signal input end of the CPU.

2. The cable retracting and releasing device suitable for an electromagnetic chuck of an overhead traveling vehicle according to claim 1, characterized in that: The cable retracting and releasing part comprises a vertical plate (2), a reel (3), and a servo motor (4); the number of the vertical plates (2) is two, and they are arranged oppositely on the overhead travelling platform, and the reel (3) is axially connected between the vertical plates (2) on both sides; the housing of the servo motor (4) is arranged on the side wall of the vertical plate (2), and the output shaft of the servo motor (4) is connected to the end of the reel (3), and the cable is wound on the reel (3); the signal input end of the servo motor (4) is connected to the signal output end of the CPU.

3. The cable retracting and releasing device suitable for an electromagnetic chuck of an overhead traveling vehicle according to claim 2 is characterized in that: The tension sensing part comprises a fixed roller (5), a first U-shaped frame (6), a movable roller (7), a guide plate (8), a support plate (9), a spring and an infrared distance measuring sensor (10); the number of the fixed rollers (5) is two, and one end of the fixed roller (5) is axially connected to the vertical plate (1), and the two fixed rollers (5) are arranged vertically; the support plate (9) is arranged on the vertical plate (1) and is located at the height of the center point of the connecting line of the two fixed rollers (5); the two ends of the movable roller (7) are axially connected to the first U-shaped frame (6) two ends of the inner wall of the first U-shaped frame (6); a guide plate (8) is provided on the outer wall of the first U-shaped frame (6), a guide hole is provided on the support plate (9), and the guide plate (8) is inserted into the guide hole of the support plate (9); a spring is provided between the support plate (9) and the first U-shaped frame (6); an infrared distance measuring sensor (10) is provided on the outer wall of the first U-shaped frame (6), and the infrared emitting end of the infrared distance measuring sensor (10) points to the support plate (9); and the signal output end of the infrared distance measuring sensor (10) is connected to the signal input end of the CPU.

4. The cable retracting and releasing device suitable for an electromagnetic chuck of an overhead traveling vehicle according to claim 3 is characterized in that: The retractable and retractable measuring part comprises two measuring mechanisms, and both measuring mechanisms are arranged on the vertical plate (1) through a bracket; the measuring mechanisms are located directly below the vertical plate (1); the measuring mechanisms comprise a second U-shaped frame (14) and a clamping roller (15); the second U-shaped frame (14) is arranged on the vertical plate (1) through a bracket; the two ends of the clamping roller (15) are axially connected to the two ends of the inner wall of the second U-shaped frame (14); a plurality of rubber strips are evenly arranged on the circumferential side wall of the clamping roller (15); an angular velocity sensor is arranged at the end of the outer wall of the second U-shaped frame (14) and is connected to the end of the clamping roller (15); and the signal output end of the angular velocity sensor is connected to the signal input end of the CPU.

5. The cable retracting and releasing device suitable for an electromagnetic chuck of an overhead traveling vehicle according to claim 4 is characterized in that: A guide ring (11) is provided, and the guide ring (11) is arranged on the vertical plate (1) through a bracket, and the guide ring (11) is located between the vertical plate (1) and the clamping roller (15).

6. The cable retracting and releasing device suitable for an electromagnetic chuck of an overhead traveling vehicle according to claim 5, characterized in that: The cable end on the reel (3) contacts the upper fixed roller (5), the movable roller (7) and the lower fixed roller (5) in sequence from top to bottom, passes through the guide ring (11), and then passes through the gap between the two clamping rollers (15) to be connected to the terminal box on the electromagnetic suction cup (13); the movable roller (7) contacts the outer wall of the cable, and the movable roller (7) supports the cable so that it contacts and presses on the two fixed rollers (5); the cable is clamped in the middle by the clamping rollers (15) on both sides.

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