A multi-layer winding wire rope electric hoist with a limiting device

Abstract

The utility model discloses a multi-layer winding steel wire rope electric hoist with a limiting device, which belongs to the field of electric hoists and comprises an electric hoist body. A steel wire rope is arranged in a rope drum of the electric hoist body. A hook is fixedly connected to the end of the steel wire rope, and an upper limit contact block is fixedly connected to the upper end of the hook. The working principles of the upper limit device and the lower limit device provided in the multi-layer winding steel wire rope electric hoist with a limiting device are relatively simple, and the braking effect is good. The upper limit device presses the upper limit switch through the upper limit contact block, so that the upper limit switch is opened and the motor is braked. The lower limit device senses the steel wire rope approaching the sensing block provided inside the end through the sensor, and then controls the cylinder through the controller to drive the lower limit contact block to move downward to press the lower limit switch, so that the lower limit switch is opened and the motor is braked, thereby protecting the steel wire rope, preventing the steel wire rope from breaking and dangerous situations, and facilitating use.

Description

Technical Field

[0001] The utility model relates to the field of electric hoists, and more specifically to a multi-layer winding steel wire rope electric hoist with a limiting device. Background Art

[0002] Electric hoist is a special lifting equipment installed on overhead crane and gantry crane. Electric hoist has the characteristics of small size, light weight, simple operation and easy use. It is used in industrial and mining enterprises, warehouses, docks and other places. The limiter is a safety protection device used to limit the range of each mechanism during operation. This device is available on many electric hoists. It is used to protect the rising limit position limiter and the falling limit position limiter for the safe operation of the lifting mechanism. The rising limit position limiter is due to limiting the lifting height of the picking device. When the hoist is lifted to the upper limit position, the limiter can automatically cut off the power supply and stop the lifting mechanism from operating, preventing the hook and other picking devices from continuing to rise, and then prevent the lifting wire rope from being broken to avoid accidents of heavy objects falling, and also avoid damage to the electric hoist equipment. The falling limit position limiter is used to limit the picking device to the lowest position. It can automatically cut off the power supply and stop the lifting mechanism from descending. At this time, it should be ensured that the number of safety circles of the wire rope wound on the drum is not less than 2 circles.

[0003] The patent application with application number 201120161497.7 relates to a multi-layer winding wire rope electric hoist with a limit device. The working principle of the upper limit device is relatively simple, while the working principle of the lower limit device is relatively complex, which is not conducive to use. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a multi-layer winding wire rope electric hoist with a limit device. The working principles of the upper limit device and the lower limit device provided therein are relatively simple and the braking effect is better. The upper limit device squeezes the upper limit switch through the upper limit contact block, so that the upper limit switch opens and the motor is braked. The lower limit device senses the approach of the wire rope to the end through the sensor, and then controls the cylinder through the controller to drive the lower limit contact block to move downward and squeeze the lower limit switch, so that the lower limit switch opens and the motor is braked, thereby protecting the wire rope and preventing the wire rope from breaking and dangerous situations, which is convenient for use.

[0005] To solve the above problems, the utility model adopts the following technical solutions.

[0006] A multi-layer winding wire rope electric hoist with a limiting device comprises an electric hoist body, a wire rope is arranged in the rope drum of the electric hoist body, a hook is fixedly connected to the end of the wire rope, an upper limit contact block is fixedly connected to the upper end of the hook, an induction block is arranged inside the place where the head end of the wire rope is wrapped around the rope drum twice, an upper limit switch is arranged at the lower right end of the electric hoist body, an upper return spring is connected to the back of the upper limit switch, a lower limit switch is arranged at the upper right end of the electric hoist body, a lower return spring is connected to the back of the lower limit switch, a stopper is arranged at the lower end of the electric hoist body, a support frame is arranged inside the electric hoist body, a sensor is arranged at the right end of the support frame, and a control The device comprises a cylinder at the lower end of the support frame, a cylinder rod at the lower end of the cylinder, and a lower limit contact block fixedly connected to the lower end of the cylinder rod. The working principles of the upper limit device and the lower limit device provided on the multi-layer winding wire rope electric hoist containing a limit device are relatively simple, and the braking effect is good. The upper limit device squeezes the upper limit switch through the upper limit contact block, so that the upper limit switch opens and brakes the motor. The lower limit device senses the approach of the wire rope to the end with a sensor block provided inside the sensor, and then controls the cylinder through the controller to drive the lower limit contact block to move downward and squeeze the lower limit switch, so that the lower limit switch opens and brakes the motor, thereby protecting the wire rope and preventing the wire rope from breaking and dangerous situations, which is convenient for use.

[0007] Furthermore, one end of the upper return spring is connected to the upper limit switch, and the other end is connected to the upper limit switch base. One end of the lower return spring is connected to the lower limit switch, and the other end is connected to the lower limit switch base. Both the upper return spring and the lower return spring have the function of driving the upper limit switch and the lower limit switch to reset.

[0008] Furthermore, the stopper is connected to the upper limit switch, the lower limit switch and the motor of the electric hoist body through a power cord. By using the power cord to connect the upper limit switch and the lower limit switch, the upper and lower limit switches are connected to the stopper to control the operation of the stopper.

[0009] Furthermore, the sensor is connected to the controller via a power cord, and the cylinder is connected to the controller via a power cord. The sensor is connected to the controller via the power cord, and the controller is connected to the cylinder. When the sensor senses the sensing block, a signal is input to the controller, and the controller controls the cylinder to drive the lower limit contact block to move downward and squeeze the lower limit switch to open it, thereby stopping the motor.

[0010] Furthermore, the position of the lower limit contact block is set at the upper end of the lower limit switch. By setting the position of the lower limit contact block to correspond to the position of the lower limit switch, it is convenient for the lower limit contact block to control the opening of the lower limit switch.

[0011] Compared with the prior art, the advantages of the present invention are:

[0012] (1) The working principles of the upper limit device and the lower limit device provided in this scheme are relatively simple, and the braking effect is good. The upper limit device squeezes the upper limit switch through the upper limit contact block, so that the upper limit switch opens and brakes the motor. The lower limit device senses the approach of the wire rope to the end through the sensor. The sensor block provided inside the sensor block is then controlled by the controller to drive the cylinder to move the lower limit contact block downward to squeeze the lower limit switch, so that the lower limit switch opens and brakes the motor, thereby protecting the wire rope and preventing the wire rope from breaking and causing dangerous situations, which is convenient for use.

[0013] (2) One end of the upper return spring is connected to the upper limit switch, and the other end is connected to the upper limit switch base. One end of the lower return spring is connected to the lower limit switch, and the other end is connected to the lower limit switch base. Both the upper return spring and the lower return spring have the function of driving the upper limit switch and the lower limit switch to reset.

[0014] (3) The circuit breaker is connected to the upper limit switch, the lower limit switch and the motor of the electric hoist body through a power cord. By using the power cord to connect the upper limit switch and the lower limit switch, the upper and lower limit switches are connected to the circuit breaker to control the operation of the circuit breaker.

[0015] (4) The sensor is connected to the controller through a power line, and the cylinder is connected to the controller through a power line. The sensor is connected to the controller through the power line, and the controller is connected to the cylinder. When the sensor senses the sensing block, a signal is input to the controller. The controller controls the cylinder to drive the lower limit contact block to move downward and squeeze the lower limit switch to open it, thereby stopping the motor.

[0016] (5) The position of the lower limit contact block is set at the upper end of the lower limit switch. By setting the position of the lower limit contact block to correspond to the position of the lower limit switch, it is convenient for the lower limit contact block to control the opening of the lower limit switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the upper limit switch and the lower limit switch of the utility model;

[0019] Figure 3 for Figure 2Enlarged view of point A.

[0020] Description of the numbers in the figure:

[0021] 1 electric hoist body, 2 wire rope, 3 hook, 4 upper limit contact block, 5 sensor block, 6 upper limit switch, 7 upper return spring, 8 lower limit switch, 9 lower return spring, 10 stopper, 11 support frame, 12 sensor, 13 controller, 14 cylinder, 15 cylinder rod, 16 lower limit contact block. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-3 , a multi-layer winding wire rope electric hoist with a limiting device, including an electric hoist body 1, see Figure 1-3 A steel wire rope 2 is arranged in the rope drum of the electric hoist body 1. The steel wire rope 2 has the function of driving the hook 3 to move up and down to lift the goods. The end of the steel wire rope 2 is fixedly connected to the hook 3. The hook 3 has the function of lifting the heavy object and thus carrying it. The upper end of the hook 3 is fixedly connected to the upper limit contact block 4. The head end of the steel wire rope 2 is wound around the rope drum twice. The inside is provided with a sensing block 5. The sensing block 5 can be sensed by the sensor 12. An upper limit switch 6 is arranged at the lower right end of the electric hoist body 1. The back of the upper limit switch 6 is connected to an upper reset spring 7. The upper reset spring 7 and the lower reset spring 9 both have a reset function. A lower limit switch 8 is arranged at the upper right end of the electric hoist body 1. The back of the lower limit switch 8 is connected to a lower reset spring 9. Spring 9, a stopper 10 is provided at the lower end of the electric hoist body 1, and the stopper 10 has the function of stopping the working motor of the electric hoist body 1 and stopping it from working. A support frame 11 is provided inside the electric hoist body 1, and a sensor 12 is provided at the right end of the support frame 11. The sensor 12 has the function of sensing the sensing block 5. A controller 13 is provided at the left end of the support frame 11, and the controller 13 has the function of controlling the cylinder 14. A cylinder 14 is provided at the lower end of the support frame 11, and the cylinder 14 has the function of driving the lower limit contact block 16 to move downward, squeezing the lower limit switch 8, thereby opening the lower limit switch 8. A cylinder rod 15 is provided at the lower end of the cylinder 14, and the lower end of the cylinder rod 15 is fixedly connected with the lower limit contact block 16.

[0024] See also Figure 2One end of the upper return spring 7 is connected to the upper limit switch 6, and the other end is connected to the upper limit switch base. One end of the lower return spring 9 is connected to the lower limit switch 8, and the other end is connected to the lower limit switch base. The upper return spring 7 and the lower return spring 9 both have the function of driving the upper limit switch 6 and the lower limit switch 8 to reset, so that the upper limit switch 6 and the lower limit switch 8 are closed. The circuit breaker 10 is connected to the upper limit switch 6, the lower limit switch 8 and the motor of the electric hoist body 1 through a power cord. By using the power cord to connect the upper limit switch 6 and the lower limit switch 8, the upper and lower limit switches are connected to the circuit breaker 10, so as to control the operation of the circuit breaker 10.

[0025] See also Figure 2 and Figure 3 The sensor 12 is connected to the controller 13 through a power line, and the cylinder 14 is connected to the controller 13 through a power line. The sensor 12 is connected to the controller 13 by using the power line, and the controller 13 is connected to the cylinder 14, so that when the sensor 12 senses the sensing block 5, a signal is input to the controller 13, and the controller 13 controls the cylinder 14 to drive the lower limit contact 16 to move downward to squeeze the lower limit switch 8 to open it, and controls the stopper 10 to stop the motor of the electric hoist body 1. The position of the lower limit contact 16 is set at the upper end of the lower limit switch 8. By setting the position of the lower limit contact 16 to correspond to the position of the lower limit switch 8, it is convenient for the lower limit contact 16 to control the lower limit switch 8 to open and use.

[0026] When the multi-layer winding wire rope electric hoist with a limit device is in use, when the electric hoist body 1 is in use, the motor controlling the hook 3 is turned on, and the motor rotates to drive the hook 3 to move downward to lift the weight. When the wire rope 2 rotates to two turns left, the sensor 12 senses the sensing block 5 placed inside the wire rope 2, and then the sensor 12 transmits a signal to the controller 13, and the controller 13 receives the signal to control the cylinder 14 to work, and the cylinder 14 drives the lower limit contact block 16 to move downward through the cylinder rod 15 to squeeze the lower limit switch 8. , the lower limit switch 8 is turned on, and the stopper 10 is controlled to work, and the motor that drives the hook 3 to move downward is disconnected and stopped. When the hook 3 moves upward, when the hook 3 moves to the lower end of the electric hoist body 1, the upper limit contact block 4 provided at the upper end of the hook 3 squeezes the upper limit switch 6, and the upper limit switch 6 is turned on, controlling the stopper 10 to stop the motor. The limit device has a simple structure, and has a good effect of limiting the position of the wire rope 2, has the function of protecting the wire rope 2, and is easy to use.

[0027] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A multi-layer winding wire rope electric hoist with a limit device, comprising an electric hoist body (1), characterized in that: A steel wire rope (2) is arranged in the rope drum of the electric hoist body (1), the end of the steel wire rope (2) is fixedly connected to a hook (3), the upper end of the hook (3) is fixedly connected to an upper limit contact block (4), an induction block (5) is arranged inside the head end of the steel wire rope (2) where it is wound around the rope drum twice, an upper limit switch (6) is arranged at the lower right end of the electric hoist body (1), the back of the upper limit switch (6) is connected to an upper return spring (7), and a lower limit switch (8) is arranged at the upper right end of the electric hoist body (1), the lower limit switch (8) is connected to the upper return spring (7), and the lower limit switch (8) is connected to the upper return spring (7). The back of the switch (8) is connected to a lower return spring (9), the lower end of the electric hoist body (1) is provided with a stopper (10), the interior of the electric hoist body (1) is provided with a support frame (11), the right end of the support frame (11) is provided with a sensor (12), the left end of the support frame (11) is provided with a controller (13), the lower end of the support frame (11) is provided with a cylinder (14), the lower end of the cylinder (14) is provided with a cylinder rod (15), and the lower end of the cylinder rod (15) is fixedly connected with a lower limit contact block (16).

2. A multi-layer winding wire rope electric hoist with a limiting device according to claim 1, characterized in that: One end of the upper return spring (7) is connected to the upper limit switch (6), and the other end is connected to the upper limit switch base; one end of the lower return spring (9) is connected to the lower limit switch (8), and the other end is connected to the lower limit switch base.

3. A multi-layer winding wire rope electric hoist with a limiting device according to claim 1, characterized in that: The stopper (10) is connected to the upper limit switch (6), the lower limit switch (8) and the motor of the electric hoist body (1) via a power line.

4. A multi-layer winding wire rope electric hoist with a limiting device according to claim 1, characterized in that: The sensor (12) is connected to the controller (13) via a power line, and the cylinder (14) is connected to the controller (13) via a power line.

5. A multi-layer winding wire rope electric hoist with a limiting device according to claim 1, characterized in that: The lower limit contact block (16) is arranged at the upper end of the lower limit switch (8).

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