Device for accurately controlling operation of electric chain hoist

Abstract

The utility model provides a device for accurately controlling the operation of an electric chain hoist. According to the device, a connecting end cover is fixedly installed at the end of an electric chain hoist, a synchronous two-stage speed reducer is fixedly installed on the connecting end cover, a waterproof shell, an encoder power module and an absolute value rotary encoder are fixedly installed on an installation frame, the installation frame is fixedly installed on a tail cover, and the two ends of the waterproof shell are installed on the connecting end cover and the installation frame respectively. And a waterproof cable joint and a control cable are fixedly arranged at the lower part of the waterproof shell, and an output shaft of the electric chain hoist is connected with the synchronous secondary speed reducer. According to the device, the rotary encoder is used for counting, the encoder transmits a numerical value to the control cabinet, when a feedback value is equal to an input value, the control cabinet cuts off a power supply of the electric chain hoist, the electric chain hoist stops running, the device is reasonable in design, easy and convenient to operate and high in automation degree, and the operation and control difficulty of operators is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery and electric hoists, in particular to a device for accurately controlling the operation of an electric chain hoist. Background Art

[0002] The electric chain hoist has advanced performance and structure, small size, light weight, reliable performance, easy operation, and a wide range of applications. It is very convenient for lifting heavy objects, loading and unloading work, repairing equipment, and lifting goods. It can also be installed on suspended I-beams, curved tracks, cantilever crane rails and fixed lifting points to lift heavy objects. The electric chain hoist uses a high-strength tensile shell or a die-cast aluminum shell, and is precisely manufactured using a thin-wall extrusion molding process. It is small in size, light in weight, and high in strength. The standard chain electric hoist has an independent gearbox system, a secondary coaxial transmission gear mechanism in a sealed gearbox, and a long-life oil bath lubrication system. The electric hoist uses a powder metallurgy clutch as an overload protection device, and the brake uses a disc DC electromagnetic field brake, which has a large braking torque, is stable, rapid, and has low noise. The lifting capacity of the electric chain hoist is generally 0.1-100 tons, and the lifting height is 3-120 meters. The electric chain hoist is one of the commonly used lifting equipment in factories, mines, ports, warehouses, freight yards, shops, etc. It is an essential machine to improve labor efficiency and labor intensity conditions.

[0003] The electric chain hoist in the prior art lifts an object to a certain position and then drops to a certain position. It is controlled by an external limiter or sensor so that the electric chain hoist stops after the object is lifted or dropped to a certain position. The electric chain hoist itself has an anti-overload sensor and an upper and lower limiter, so there are few problems during use. With the development of production technology, during the operation of lifting objects, it is required that the controller set a distance within the total stroke. The electric chain hoist lifts the corresponding distance according to the set parameters and feeds back to the controller the actual distance traveled by the chain hoist, requiring precise control. However, the electric chain hoist in the prior art does not have such a function.

[0004] In view of the above situation, the applicant has designed a device capable of accurately controlling the operation of the chain hoist based on the existing electric chain hoist and combining the electrical control technology. Summary of the invention

[0005] The purpose of the utility model is to provide a device for accurately controlling the operation of an electric chain hoist. The technical problem to be solved by the utility model is: to add a synchronous two-stage reducer to the tail of the main shaft of the existing electric chain hoist, to connect an absolute value rotary encoder and a power module for powering the encoder behind the synchronous two-stage reducer, and to connect the above-mentioned equipment to the chain hoist with a waterproof housing. The lifting distance of the electric chain hoist is verified by setting the value of the absolute value rotary encoder, and the numerical difference of the encoder is set, which is displayed on the display panel of the control cabinet after percentage conversion. The percentage of the lifting position of the electric chain hoist can be seen on the display panel, and after conversion by the 4-20mA input and output module, the lifting position of the electric chain hoist can be remotely and accurately controlled and the corresponding position can be fed back.

[0006] To achieve the above purpose, the technical solution of the utility model is:

[0007] A device for accurately controlling the operation of an electric chain hoist comprises: an electric chain hoist, a connecting end cover, a synchronous secondary reducer, a waterproof shell, a tail cover, an encoder power module, an absolute value rotary encoder, a mounting frame, a waterproof cable connector, a control cable, a control cabinet, and a display screen. The device has a connecting end cover fixedly mounted on the end of the electric chain hoist, a synchronous secondary reducer fixedly mounted on the connecting end cover, a waterproof shell is sleeved on the outside of the synchronous secondary reducer, the encoder power module and the absolute value rotary encoder are fixedly mounted on the mounting frame, the mounting frame is fixedly mounted on the tail cover by connecting bolts, two ends of the waterproof shell are respectively mounted on the connecting end cover and the mounting frame, a waterproof cable connector is fixedly mounted on the lower part of the waterproof shell, the control cable is connected to the waterproof cable connector, and the output shaft of the electric chain hoist is connected to the synchronous secondary reducer.

[0008] The electric chain hoist in the device is connected to the control cabinet in the central control room by a power line, and the absolute value rotary encoder and the display screen are connected to the control cabinet in the central control room by control cables respectively.

[0009] The absolute value rotary encoder used in the device is a mature product in the prior art, and the encoder power module is a power module used in conjunction with the absolute value rotary encoder.

[0010] Compared with the prior art, the positive effects of the utility model are:

[0011] 1. The device reduces the speed of the electric chain hoist motor through a synchronous secondary reducer, and then uses a rotary encoder to count. The encoder transmits the value to the control cabinet, and the control cabinet confirms the position of the electric chain hoist by reading and comparing the encoder value;

[0012] 2. The device uses a 4-20mA analog input and output interface. The operator only needs to set a 4-20mA current value for the control cabinet. The control cabinet transmits the set current value to the electric chain hoist motor through the power line. The electric chain hoist runs and converts the encoder feedback signal into a 4-20mA current and compares it with the input value. When the feedback value is equal to the input value, the control cabinet cuts off the power supply of the electric chain hoist, and the motor of the electric chain hoist stops running with a brake, realizing the stop of the electric chain hoist at any position in the full stroke.

[0013] 3. The device can realize remote centralized control. The input and output I / O interface of the control cabinet is connected to the central control room through the bus, and the central control room is responsible for unified control and management. One control cabinet can control the operation of multiple chain hoists at the same time.

[0014] 4. The device is reasonably designed, easy to operate, and highly automated, which reduces the difficulty of operation and control for operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technology of the utility model, the drawings required for use in the implementation are briefly introduced. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] The structures, proportions, sizes, etc. of the drawings shown in this specification are only used to match the contents disclosed in the specification so as to facilitate the understanding and reading of those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment in size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the technology of the present invention.

[0017] Figure 1 , schematic diagram of the structure of the precise control of the electric chain hoist operation device;

[0018] Figure 2 , connection diagram of the electric chain hoist, absolute rotary encoder, display screen and control cabinet in the device.

[0019] In the figure: 1. Electric chain hoist, 2. Connection end cover, 3. Synchronous two-stage reducer, 4. Waterproof housing, 5. Tail cover, 6. Encoder power module, 7. Absolute rotary encoder, 8. Mounting bracket, 9. Waterproof cable connector, 10. Control cable, 11. Control cabinet, 12. Display screen. DETAILED DESCRIPTION

[0020] The technical solution of the present utility model is further described clearly and completely below in conjunction with the accompanying drawings.

[0021] See attached Figure 1-2 , installation and connection of the device, the connection end cover 2 is fixed on the end of the electric chain hoist 1, the synchronous secondary reducer 3 is fixed on the connection end cover 2, the waterproof housing 4 is mounted on the outside of the synchronous secondary reducer 3, one end of the waterproof housing 4 is installed on the connection end cover 2, and the other end is installed on the mounting frame 8, the waterproof cable connector 9 is fixed on the lower part of the waterproof housing 4, and the control cable 10 is connected to the waterproof cable connector 9. The output shaft of the electric chain hoist 1 is connected to the synchronous secondary reducer 3, and the motor speed of the electric chain hoist 1 is proportionally reduced by the synchronous secondary reducer 3. The encoder power module 6 and the absolute value rotary encoder 7 are installed in the waterproof housing 4 and fixed on the mounting frame 8, and the mounting frame 8 is fixed on the tail cover 5 through the connecting bolts.

[0022] The electric chain hoist 1 in the device is connected to the control cabinet 11 in the central control room by a power line, and the absolute value rotary encoder 7 and the display screen 12 are connected to the control cabinet 11 in the central control room by control cables 10 respectively.

[0023] When in use, after the control cabinet 11 is powered on, the electric chain hoist 1 is first operated to the corresponding upper and lower limits. The electric chain hoist 1 is connected to the synchronous secondary reducer 3 through the output shaft, and the motor speed of the electric chain hoist 1 is proportionally reduced. The upper and lower limits of the operation of the electric chain hoist 1 are set respectively by the control module in the control cabinet 11. After setting, the electric chain hoist 1 is operated again. When the electric chain hoist 1 is lifted to the upper limit, the feedback signal of the absolute value rotary encoder 7 is converted into a 4-20mA current and compared with the input value. When the feedback value is equal to the input value, the control cabinet 11 cuts off the power supply of the electric chain hoist 1, and the motor of the electric chain hoist 1 will stop running with a brake. When the electric chain hoist 1 runs to the lower limit, the feedback signal of the absolute value rotary encoder 7 is converted into a 4-20mA current and compared with the input value. When the feedback value is equal to the input value, the control cabinet 11 cuts off the power supply of the electric chain hoist 1, and the motor of the electric chain hoist 1 will stop running with a brake. The control cabinet 11 is connected to the 4-20mA analog quantity for operation. After inputting any analog quantity in 4-20mA, when the electric chain hoist 1 runs to the position corresponding to the input analog quantity, the feedback signal of the absolute value rotary encoder 7 is converted into a 4-20mA current for comparison with the input value. When the feedback value is equal to the input value, the control cabinet 11 cuts off the power supply of the electric chain hoist 1, and the motor of the electric chain hoist 1 will brake and stop running. The lifting distance of the electric chain hoist 1 is compared with the value of the absolute value rotary encoder 7. The value difference of the absolute value rotary encoder 7 is displayed on the panel of the display screen 12 of the control cabinet 11 after percentage conversion. The percentage of the lifting position of the electric chain hoist 1 can be seen on the display panel. After conversion by the 4-20mA input and output module, the lifting position of the electric chain hoist 1 can be remotely and accurately controlled and the corresponding position can be fed back, thereby realizing the requirement that the electric chain hoist 1 can stop at any position within the travel range. The encoder power module 6 is used to pass the working power to the absolute value rotary encoder 7.

[0024] The above is only a non-limiting implementation method of the utility model, and a large number of embodiments can be derived. For ordinary technicians in this field, without departing from the creative concept of the present invention and without making creative work, several modified and improved embodiments can be made, which all fall within the scope of protection of the present invention.

Claims

1. A device for accurately controlling the operation of an electric chain hoist, comprising: An electric chain hoist (1), a connecting end cover (2), a synchronous secondary reducer (3), a waterproof housing (4), a tail cover (5), an encoder power module (6), an absolute rotary encoder (7), a mounting frame (8), a waterproof cable connector (9), a control cable (10), a control cabinet (11), and a display screen (12), wherein the device is characterized in that: the connecting end cover (2) is fixedly mounted at the end of the electric chain hoist (1), the connecting end cover (2) is fixedly mounted with a synchronous secondary reducer (3), and the synchronous secondary reducer (3 ) is provided with a waterproof housing (4) on the outside, an encoder power module (6) and an absolute value rotary encoder (7) are fixedly mounted on a mounting frame (8), the mounting frame (8) is fixedly mounted on a tail cover (5) by connecting bolts, two ends of the waterproof housing (4) are respectively mounted on a connecting end cover (2) and the mounting frame (8), a waterproof cable connector (9) is fixedly mounted on the lower part of the waterproof housing (4), a control cable (10) is connected to the waterproof cable connector (9), and an output shaft of the electric chain hoist (1) is connected to a synchronous secondary reducer (3).

2. The device for accurately controlling the operation of an electric chain hoist according to claim 1, characterized in that: The electric chain hoist (1) in the device is connected to a control cabinet (11) in a central control room via a power line, and the absolute value rotary encoder (7) and the display screen (12) are connected to the control cabinet (11) in the central control room via control cables (10).

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