Control device and control system of lifting equipment

Abstract

The invention provides a control device and a control system of lifting equipment, the control device comprises a driver, a first contactor and a first limiting stopper, the first limiting stopper is used for being disconnected when the lifting equipment operates at a first height, and the lifting equipment comprises a motor; a first voltage output end of the driver is connected with one end of the motor through a first main contact of the first contactor, a second voltage output end of the driver is connected with the other end of the motor through a second main contact of the first contactor, and one end of a normally open contact of the first contactor is connected with a first signal input end of the driver. The other end of the normally open contact of the first contactor is connected with one end of the first limiting stopper, the other end of the first limiting stopper is connected with a second signal input end of the driver, and the driver is used for stopping outputting voltage when connection between the first signal input end and the second signal input end is disconnected. Therefore, the operation safety of the lifting equipment is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of lifting equipment control, and in particular to a control device and a control system for lifting equipment. Background Art

[0002] Existing lifting equipment generally connects the limiter in series with the coil control circuit of the contactor to ensure that the lifting equipment can automatically stop running when it reaches a preset height to prevent the equipment from exceeding the safe operating range. However, during long-term operation, the contactor may have structural jams or contact adhesion and other faults. These faults will cause the lifting equipment to be unable to cut off the power supply when it reaches the set limiter height, thereby increasing the risk of safety accidents and posing serious safety hazards to the safe operation of the lifting equipment. Summary of the invention

[0003] The technical problem to be solved by the present disclosure is to overcome the defect in the prior art that the lifting equipment cannot stop running at a limited height due to a contactor failure, and to provide a control device and a control system for the lifting equipment.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] In a first aspect, a control device for a lifting device is provided, the control device comprising a driver, a first contactor and a first limiter; the first limiter is used to disconnect when the lifting device runs to a first height, and the lifting device comprises a motor;

[0006] The first voltage output terminal of the driver is connected to one end of the motor through the first main contact of the first contactor, and the second voltage output terminal of the driver is connected to the other end of the motor through the second main contact of the first contactor;

[0007] One end of the normally open contact of the first contactor is connected to the first signal input end of the driver, and the other end of the normally open contact of the first contactor is connected to one end of the first limiter;

[0008] The other end of the first limiter is connected to the second signal input end of the driver, and the driver is used to stop outputting voltage when the connection between the first signal input end and the second signal input end is disconnected.

[0009] Optionally, the control device further comprises a second contactor and a second limiter, wherein the second limiter is used to disconnect when the lifting device descends to a second height, and the first limiter is specifically used to disconnect when the lifting device rises to a first height, and the second height is lower than the first height; the coil of the first contactor and the coil of the second contactor do not work at the same time;

[0010] One end of the motor is connected to the first voltage output end of the driver through the first main contact of the second contactor, and the other end of the motor is connected to the second voltage output end of the driver through the second main contact of the second contactor;

[0011] One end of the normally open contact of the second contactor is connected to the third signal input terminal of the driver, and the other end of the normally open contact of the second contactor is connected to one end of the second limiter;

[0012] The other end of the second limiter is connected to the fourth signal input end of the driver, and the driver is used to stop outputting voltage when the connection between the third signal input end and the fourth signal input end is disconnected.

[0013] Optionally, the control device further comprises a third limiter, the third limiter being used to be disconnected when the lifting device rises to a third height, the third height being lower than the first height;

[0014] One end of the third stopper is connected to a power source, and the other end of the third stopper is grounded through the coil of the first contactor.

[0015] Optionally, the control device also includes a first start button; one end of the first start button is connected to the power supply, the other end of the first start button is connected to one end of the third limiter, and the other end of the third limiter is grounded through the coil of the first contactor.

[0016] Optionally, the control device further includes a first stop button; the first stop button is arranged between the power supply and the first start button.

[0017] Optionally, the control device further comprises a fourth limiter, and the fourth limiter is used to be disconnected when the lifting device descends to a fourth height; the fourth height is higher than the second height;

[0018] One end of the fourth limiter is connected to a power source, and the other end of the fourth limiter is grounded through the coil of the second contactor.

[0019] Optionally, the control device also includes a second start button; one end of the second start button is connected to the power supply, the other end of the second start button is connected to one end of the fourth limiter, and the other end of the fourth limiter is grounded through the coil of the second contactor.

[0020] Optionally, the control device further includes a second stop button; the second stop button is arranged between the power supply and the second start button.

[0021] Optionally, the control device includes an alarm device; the alarm device is used to alarm when the first limiter is disconnected.

[0022] In a second aspect, a control system for a lifting device is provided, the control system comprising the control device and the lifting device as described in the first aspect.

[0023] On the basis of being in accordance with the common sense in the art, the above-mentioned optional conditions can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

[0024] The positive progressive effect of the present disclosure is that when the lifting device runs to the first height set by the first limiter, the first limiter will be triggered, automatically disconnecting the connection circuit between the first signal input terminal and the second signal input terminal in the driver, causing the driver to be unable to output voltage to the motor, thereby causing the motor to stop running. Therefore, even in the event of a contactor failure, once the lifting device runs beyond the safe height, the control device can still quickly perform emergency braking on the motor, significantly improving the operational safety of the lifting device and protecting the safety of equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a control device for a lifting device provided in Example 1 of the present disclosure;

[0026] Figure 2 A schematic diagram of a control device with self-locking and interlocking mechanisms provided in Example 1 of the present disclosure. DETAILED DESCRIPTION

[0027] The present disclosure is further described below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0028] Prefixes such as "first" and "second" are used in the embodiments of the present disclosure only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present disclosure does not constitute a limitation on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and no unnecessary limitation should be constituted due to the use of such prefixes. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0029] Example 1

[0030] This embodiment provides a control device for a lifting device, such as Figure 1As shown, the control device includes a driver 101, a first contactor and a first limiter 102; the first limiter 102 is used to disconnect when the lifting device runs to a first height, and the lifting device includes a motor 103; the first voltage output terminal 105 of the driver 101 is connected to one end of the motor 103 through the first main contact 104 of the first contactor, and the second voltage output terminal 107 of the driver 101 is connected to the other end of the motor 103 through the second main contact 106 of the first contactor; one end of the normally open contact 108 of the first contactor is connected to the first signal input terminal 109 of the driver 101, and the other end of the normally open contact 108 of the first contactor is connected to one end of the first limiter 102; the other end of the first limiter 102 is connected to the second signal input terminal 110 of the driver 101, and the driver 101 is used to stop outputting voltage when the connection between the first signal input terminal 109 and the second signal input terminal 110 is disconnected.

[0031] In a specific implementation, the driver is responsible for supplying power to the motor to drive the lifting device to operate. During this process, the two main contacts and the normally open contacts of the first contactor are in a closed state, ensuring the voltage transmission between the driver and the motor, and the connection between the first signal input terminal and the second signal input terminal. When the driver detects the connection between the first signal input terminal and the second signal input terminal, it outputs voltage to the motor, and the motor starts to run. When the lifting device runs to the first height set by the first limiter, the first limiter will be triggered to disconnect. When the driver detects that the connection between the first signal input terminal and the second signal input terminal is interrupted, it will stop supplying power to the motor, the motor stops running, and the lifting device also stops running, ensuring that the lifting device can stop automatically when it runs to a preset safety height, thereby ensuring the safety of operation.

[0032] In an optional embodiment, Figure 1 As shown, the control device further includes a second contactor and a second limiter 111, the second limiter 111 is used to disconnect when the lifting device descends to the second height, and the first limiter 102 is specifically used to disconnect when the lifting device rises to the first height, and the second height is lower than the first height; the coil of the first contactor and the coil of the second contactor do not work at the same time;

[0033] One end of the motor 103 is connected to the first voltage output terminal 105 of the driver through the first main contact 113 of the second contactor, and the other end of the motor 103 is connected to the second voltage output terminal 107 of the driver 101 through the second main contact 112 of the second contactor;

[0034] One end of the normally open contact 1114 of the second contactor is connected to the third signal input terminal 115 of the driver, and the other end of the normally open contact 114 of the second contactor is connected to one end of the second limiter 111;

[0035] The other end of the second limiter 111 is connected to the fourth signal input terminal 116 of the driver, and the driver is used to stop outputting voltage when the connection between the third signal input terminal 115 and the fourth signal input terminal 116 is disconnected.

[0036] In a specific implementation, a second contactor and a second limiter are also provided in the control device of the lifting equipment to ensure that the equipment operates within a set safety range. The second limiter is responsible for setting the minimum height to which the lifting equipment can descend, i.e., the second height, and the first limiter is responsible for limiting the maximum height to which the lifting equipment can rise, i.e., the first height. Since the second height is lower than the first height, the interval between the two heights constitutes the safe operating range of the lifting equipment. Specifically, during the descent of the lifting device, when the lifting device descends to the second height set by the second limiter, the second limiter will be triggered and disconnected, resulting in the interruption of the connection between the third signal input terminal and the fourth signal input terminal. Similarly, during the ascent of the lifting device, when the lifting device rises to the first height set by the first limiter, the first limiter will be triggered and disconnected, resulting in the interruption of the connection between the first signal input terminal and the second signal input terminal. Once the driver detects that the connection between the first signal input terminal and the second signal input terminal is disconnected, or detects that the connection between the third signal input terminal and the fourth signal input terminal is disconnected, the driver will stop supplying power to the motor, causing the motor to stop running, and then the lifting device stops running, ensuring that the lifting device can stop automatically when it runs to a preset safety height. In order to avoid the motor receiving both ascending and descending instructions at the same time, the coil of the first contactor and the coil of the second contactor cannot work at the same time, ensuring that the lifting device can only move in a single direction at any time, further enhancing the safety of operation and the stability of the equipment.

[0037] In a specific example, when the driver detects that the first signal input terminal and the second signal input terminal are connected, it outputs a positive voltage to make the motor rotate forward to drive the lifting device to rise. When the driver detects that the third signal input terminal and the fourth signal input terminal are connected, it outputs a negative voltage to make the motor reverse to drive the lifting device to descend.

[0038] In another specific example, when the driver detects that the first signal input terminal and the second signal input terminal are connected, the driver outputs a negative voltage to cause the motor to reverse to drive the lifting device to descend. When the driver detects that the third signal input terminal and the fourth signal input terminal are connected, the driver outputs a positive voltage to cause the motor to rotate forward to drive the lifting device to ascend.

[0039] In an optional embodiment, the control device also includes a third limiter, which is used to disconnect when the lifting equipment rises to a third height, and the third height is lower than the first height; one end of the third limiter is connected to the power supply, and the other end of the third limiter is grounded through the coil of the first contactor.

[0040] In a specific implementation, the third limiter sets a third height that is lower than the first height set by the first limiter. The third height serves as the first safety checkpoint during the lifting device's rising process. The third limiter, the coil of the first contactor and the power supply constitute a power supply circuit. When the lifting device rises to the third height, the third limiter is triggered to automatically disconnect the power supply circuit. Once the third limiter disconnects the power supply circuit, the power supply will stop supplying power to the coil of the first contactor, causing the coil to release. After the coil is released, the first main contact and the second main contact of the first contact connected to the motor will also be disconnected accordingly, cutting off the connection between the motor and the driver, causing the motor to stop working, and thereby stopping the continued operation of the lifting device.

[0041] In a specific example, when the lifting device rises to the third height, the motor fails to cut off power normally due to a contactor failure, and the lifting device will continue to rise to the first height. The first limiter will be triggered, directly cutting off the signal transmission between the first signal input terminal and the second signal input terminal of the driver, thereby cutting off the power supply to the motor and forcibly stopping the operation of the lifting device. By setting two different rising heights, the control device provides a double safety protection mechanism. The third limiter serves as the first line of defense, cutting off the power supply at a lower height to prevent the equipment from exceeding the safe operating range, and the first limiter serves as a backup safety measure. When the lifting device fails to stop at the third height, it ensures that the equipment stops when it reaches a higher but still safe height, thereby improving the safety and reliability of the lifting device.

[0042] In an optional embodiment, the control device also includes a first start button; one end of the first start button is connected to the power supply, the other end of the first start button is connected to one end of the third limiter, and the other end of the third limiter is grounded through the coil of the first contactor.

[0043] In a specific implementation, the first start button is a trigger button for the operator to manually start the lifting device. The lifting device can be controlled to start rising by triggering the first start button. One end of the first start button is connected to the power supply, and the other end is connected to one end of the third limiter. The other end of the third limiter is grounded through the coil of the first contactor. When the operator presses the first start button, the power supply circuit is connected, and current flows through the coil of the first contactor, the coil is attracted, and the two main contacts of the first contactor are also closed. The driver outputs voltage to the motor, and the lifting device starts to run upward. The first start button provides the operator with a simple and direct method to start the rising movement of the lifting device.

[0044] In an optional embodiment, the control device also includes a first stop button; the first stop button is arranged between the power supply and the first start button.

[0045] In a specific implementation, a first stop button is also provided in the control device. The operator controls the lifting equipment to stop urgently during the ascending process by triggering the first stop button. The first stop button is arranged in the connection line between the first start button and the power supply. When the operator presses the first stop button, the power supply circuit is cut off, and the coil of the first contactor loses power supply, causing the coil to be released, and the first main contact and the second main contact of the first contactor are disconnected, the motor is powered off and stops running, and the lifting equipment also stops running.

[0046] In a specific example, the connection sequence between the first stop button, the first start button, the third limiter, and the coil of the first contactor can be adjusted according to the actual application scenario.

[0047] In an optional embodiment, the control device also includes a fourth limiter, which is used to disconnect when the lifting equipment descends to a fourth height; the fourth height is higher than the second height; one end of the fourth limiter is connected to the power supply, and the other end of the fourth limiter is grounded through the coil of the second contactor.

[0048] In a specific implementation, the fourth limiter sets a fourth height that is higher than the second height set by the second limiter. The fourth height serves as the first safety checkpoint during the descent of the lifting device. The fourth limiter, the coil of the second contactor and the power supply constitute a power supply circuit. When the lifting device descends to the fourth height, the fourth limiter is triggered to automatically disconnect the power supply circuit. Once the fourth limiter disconnects the power supply circuit, the power supply will stop supplying power to the coil of the second contactor, causing the coil to release. After the coil is released, the first main contact and the second main contact of the second contactor connected to the motor will also be disconnected accordingly, cutting off the connection between the motor and the driver, causing the motor to stop working, and thereby stopping the continued operation of the lifting device.

[0049] In a specific example, when the lifting device descends to the fourth height, the motor fails to cut off power normally due to a contactor failure, and the lifting device will continue to descend to the second height. The second limiter will be triggered, directly cutting off the signal transmission between the third signal input terminal and the fourth signal input terminal of the driver, thereby cutting off the power supply to the motor and forcibly stopping the lifting device. By setting two different descent heights, the control device provides a double safety guarantee mechanism. The fourth limiter serves as the first line of defense for descent. It cuts off power at a higher position to prevent the lifting device from exceeding the safe operating range. The second limiter serves as a backup safety measure. When the lifting device fails to stop at the fourth height, it ensures that the device stops when it reaches a lower but still safe height, thereby improving the safety and reliability of the lifting device.

[0050] In an optional embodiment, the control device also includes a second start button; one end of the second start button is connected to the power supply, the other end of the second start button is connected to one end of the fourth limiter, and the other end of the fourth limiter is grounded through the coil of the second contactor.

[0051] In a specific implementation, the operator manually triggers the second start button to control the lifting device to start descending. One end of the second start button is connected to the power supply, and the other end is connected to one end of the fourth limiter. The other end of the fourth limiter is grounded through the coil of the second contactor. When the operator presses the second start button, the power supply circuit is connected, and current flows through the coil of the second contactor, which is attracted. The two main contacts of the second contactor are also closed, and the driver outputs voltage to the motor, and the lifting device starts to move downward. The second start button provides the operator with a simple and direct method to start and control the descending movement of the lifting device.

[0052] In an optional embodiment, the control device also includes a second stop button; the second stop button is arranged between the power supply and the second start button.

[0053] In a specific implementation, a second stop button is also provided in the control device. By triggering the second stop button, the operator can achieve an emergency stop during the operation of the lifting equipment. The second stop button is arranged in the connection line between the second start button and the power supply. When the operator presses the second stop button, the power supply circuit is cut off, and the coil of the second contactor loses power, causing the coil to release, the first main contact and the second main contact of the second contactor are disconnected, the motor stops running, and the lifting equipment also stops running.

[0054] In a specific example, the connection sequence between the second stop button, the second start button, the fourth limiter, and the coil of the second contactor can be adjusted according to the actual application scenario.

[0055] In an optional embodiment, the control device includes an alarm device; the alarm device is used to alarm when the first limiter is disconnected.

[0056] In a specific implementation, an alarm device is provided in the control device, which is used to warn the staff when the equipment reaches the boundary of the safe operating range. When the first limit switch is disconnected, it indicates that the lifting equipment has reached the set boundary of the safe operating range. At this time, the alarm device emits sound, light or other forms of alarm signals to attract the attention of the staff.

[0057] In another optional implementation, the alarm device may also be used to alarm when the second limiter, the third limiter or the fourth limiter is disconnected.

[0058] In a specific implementation, if any limiter set in the control device is disconnected, it means that the lifting equipment has run to the set height. At this time, the alarm device can remind the operator to perform corresponding operations to ensure the safety of the lifting equipment.

[0059] In a specific example, Figure 2 As shown, the power supply 117, the first stop button 118, the first start button 119, the first self-locking contact 120, the first interlocking contact 121, the third stopper 122, and the coil 123 of the first contactor constitute the lifting control circuit of the lifting device. When the first start button 119 is closed, the first stop button 118, the first self-locking contact 120, the first interlocking contact 121 and the third stopper 122 are all closed, and at this time, the coil 123 of the first contactor is energized and attracted, so that Figure 1 The first main contact 104 of the first contactor, the second main contact 106 of the first contactor, and the normally open contact 108 of the first contactor shown in are all closed, and the driver detects the connection between the first signal input terminal 109 and the second signal input terminal 110, and outputs a positive voltage to the motor 103, so that the motor 103 reverses, thereby driving the lifting device to start rising, wherein the first self-locking contact 120 can keep the coil 123 of the first contactor energized, even if the first start button 119 is released, the lifting device can continue to run until the first stop button 118 is triggered, or the lifting device rises to the height defined by the third limiter 122, at which time the lifting device will stop running; as shown in FIG. Figure 2 As shown, the second stop button 124, the second start button 125, the second self-locking contact 126, the second interlocking contact 127, the fourth limiter 128 and the coil 129 of the second contactor constitute a descending power supply circuit of the lifting device. When the second start button 125 is triggered, the second stop button 124, the second self-locking contact 126, the second interlocking contact 127 and the fourth limiter 128 are all closed, and the coil 129 of the second contactor is energized and attracted, so that Figure 1The first main contact 113 of the second contactor, the second main contact 114 of the second contactor and the normally open contact 114 of the second contactor shown in the figure are all closed, and the driver detects the connection between the third signal input terminal 115 and the fourth signal input terminal 116, and outputs a negative voltage to the motor 103, so that the motor 103 reverses, thereby driving the lifting device to start descending, and the second self-locking contact 126 can keep the coil 129 of the second contactor energized to achieve continuous control. Even if the second start button 125 is released, the lifting device can continue to run until the second stop button 124 is triggered, or the lifting device descends to the height specified by the fourth limiter 128, at which time the lifting device will stop running. When the coil 123 of the first contactor is energized, the second interlocking contact 127 will be disconnected, disconnecting the descent power supply circuit. The first interlocking contact 121 and the second interlocking contact 127 can prevent the two contactors from being energized at the same time, ensuring that the rising and falling actions of the lifting device will not be performed at the same time, ensuring safe operation.

[0060] Example 2

[0061] This embodiment provides a control system for a lifting device, and the control system includes the control device and the lifting device as described in Embodiment 1.

[0062] In this embodiment, the control system consists of two parts: a control device and a lifting device. The control device is built into the lifting device and can accurately control the operating height of the lifting device. Once it is detected that the lifting device exceeds the preset safety height limit, the control device will automatically cut off power to protect the safety of the lifting device and the operator.

[0063] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, but these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A control device for a lifting device, It is characterized in that The control device includes a driver, a first contactor and a first limiter; the first limiter is used to disconnect when the lifting device runs to a first height, and the lifting device includes a motor; The first voltage output terminal of the driver is connected to one end of the motor through the first main contact of the first contactor, and the second voltage output terminal of the driver is connected to the other end of the motor through the second main contact of the first contactor; One end of the normally open contact of the first contactor is connected to the first signal input end of the driver, and the other end of the normally open contact of the first contactor is connected to one end of the first limiter; The other end of the first limiter is connected to the second signal input end of the driver, and the driver is used to stop outputting voltage when the connection between the first signal input end and the second signal input end is disconnected.

2. The control device according to claim 1, It is characterized in that The control device further includes a second contactor and a second limiter, wherein the second limiter is used to disconnect when the lifting device descends to a second height, and the first limiter is used to disconnect when the lifting device rises to a first height, and the second height is lower than the first height; The coil of the first contactor and the coil of the second contactor do not operate simultaneously; One end of the motor is connected to the first voltage output end of the driver through the first main contact of the second contactor, and the other end of the motor is connected to the second voltage output end of the driver through the second main contact of the second contactor; One end of the normally open contact of the second contactor is connected to the third signal input terminal of the driver, and the other end of the normally open contact of the second contactor is connected to one end of the second limiter; The other end of the second limiter is connected to the fourth signal input end of the driver, and the driver is used to stop outputting voltage when the connection between the third signal input end and the fourth signal input end is disconnected.

3. The control device according to claim 2, It is characterized in that The control device further comprises a third limiter, the third limiter being used to be disconnected when the lifting device rises to a third height, the third height being lower than the first height; One end of the third stopper is connected to a power source, and the other end of the third stopper is grounded through the coil of the first contactor.

4. The control device according to claim 3, It is characterized in that The control device also includes a first start button; One end of the first start button is connected to the power supply, the other end of the first start button is connected to one end of the third limiter, and the other end of the third limiter is grounded through the coil of the first contactor.

5. The control device according to claim 4, It is characterized in that The control device also includes a first stop button; The first stop button is disposed between the power source and the first start button.

6. The control device according to claim 3, It is characterized in that The control device further includes a fourth limiter, which is used to be disconnected when the lifting device descends to a fourth height; the fourth height is higher than the second height; One end of the fourth limiter is connected to a power source, and the other end of the fourth limiter is grounded through the coil of the second contactor.

7. The control device according to claim 6, It is characterized in that The control device also includes a second start button; One end of the second start button is connected to the power supply, the other end of the second start button is connected to one end of the fourth limiter, and the other end of the fourth limiter is grounded through the coil of the second contactor.

8. The control device according to claim 7, It is characterized in that The control device also includes a second stop button; The second stop button is disposed between the power source and the second start button.

9. The control device according to claim 1, It is characterized in that The control device includes an alarm device; The alarm device is used for alarming when the first limiter is disconnected.

10. A control system for a lifting device, It is characterized in that The control system comprises a control device and a lifting device according to any one of claims 1 to 9.

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