Emergency starting control system for crown block

Abstract

The utility model discloses a crown block emergency start control system, which relates to an electrical control system and comprises a main circuit breaker, a control mechanism and a contactor. The device further comprises an emergency switch, a selection switch and a monitoring mechanism. One end of the emergency switch is electrically connected with the input end of the main circuit breaker, the other end of the emergency switch is electrically connected with the input end of the contactor and one end of the selection switch at the same time, and the other end of the selection switch is electrically connected with the output end of the contactor; the output end of the control mechanism is connected with a monitoring mechanism. According to the utility model, the emergency starting control system can be rapidly switched to supply power to the execution mechanism at the rear end, the security threat on site is reduced, and the accurate positioning of abnormal points is realized.

Description

Technical Field

[0001] This utility model relates to electrical control systems, and more specifically, to an emergency start control system for overhead cranes. Background Technology

[0002] like Figure 1 As shown, a traditional overhead crane starting control system includes a main circuit breaker 1, a control mechanism 2, and a contactor 3. The control mechanism consists of multiple sub-components, such as four door limit switches, overcurrent relays, an electric lock, a starter switch, an emergency stop switch, a hoist, and zero-position protection for the trolley and crane. These components of the control mechanism 2 are connected in series, requiring sequential activation before the actuators can be controlled. This control mechanism has a simple connection structure, is easy to install, and is simple to operate, reducing the likelihood of operational errors. However, if any sub-component of the control mechanism malfunctions, the crane's actuator 4 will fail to start properly, leading to abnormal crane operation. If this abnormal behavior occurs during crane operation, the crane and the materials hoisted on it are often not in a safe area, posing a significant safety threat. Furthermore, this situation requires maintenance personnel to inspect each sub-component of the control mechanism individually, resulting in lengthy repair times and impacting production. Utility Model Content

[0003] The technical problem this invention aims to solve is to address the shortcomings of existing technologies by providing an emergency start control system for overhead cranes. This system can quickly switch to the emergency start control system to supply power to the downstream actuators, thereby reducing on-site safety threats.

[0004] The present invention discloses an emergency start control system for overhead cranes, comprising a main circuit breaker, a control mechanism, and a contactor; it also includes an emergency switch, a selector switch, and a monitoring mechanism; one end of the emergency switch is electrically connected to the input end of the main circuit breaker, the other end of the emergency switch is electrically connected to both the input end of the contactor and one end of the selector switch, and the other end of the selector switch is electrically connected to the output end of the contactor; the output end of the control mechanism is connected to the monitoring mechanism.

[0005] Preferably, the monitoring mechanism includes relays in a number consistent with the number of sub-components of the control mechanism; multiple relays are connected one-to-one with the sub-components of the control mechanism, one end of the coil of the relay is electrically connected to the output terminal of the sub-component, the other end of the coil of the relay is grounded, the common terminal of the relay is electrically connected to the output terminal of the sub-component, and the normally open contact of the relay is grounded through an indicator light.

[0006] Preferably, the indicator light includes a first light and a second light, which are connected in parallel. The first light is installed in the cab of the crane, and the second light is installed on the outside of the crane.

[0007] Preferably, the selector switch is electrically connected to the output terminal of the contactor via a protector.

[0008] Beneficial effects

[0009] The advantages of this invention are as follows: By setting up an emergency switch and a selector switch circuit connected in parallel with the control mechanism, both ends of the contactor can form a power supply path with the power supply terminal. This allows for rapid switching to the emergency start control system to supply power to the downstream actuators, enabling the fastest possible emergency start of the overhead crane, minimizing the occurrence of accidents, and facilitating stable production operation. A monitoring mechanism is installed at the output end of the control mechanism, enabling abnormal monitoring of each sub-component within the control mechanism and allowing for rapid and effective location of abnormal sub-components. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the results of a traditional control system;

[0011] Figure 2 This is a schematic diagram of the control system structure of this utility model;

[0012] Figure 3 This is a schematic diagram of the monitoring mechanism structure of this utility model. Detailed Implementation

[0013] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0014] See Figures 2-3This utility model discloses an emergency start control system for an overhead crane, comprising a main circuit breaker 1, a control mechanism 2, a contactor 3, an emergency switch SB1, a selector switch SB2, and a monitoring mechanism 5. One end of the emergency switch SB1 is electrically connected to the input terminal of the main circuit breaker 1, and the other end of the emergency switch SB1 is electrically connected to both the input terminal of the contactor 3 and one end of the selector switch SB2. The other end of the selector switch SB2 is electrically connected to the output terminal of the contactor 3. When the control mechanism 2 malfunctions, pressing the emergency switch SB1 short-circuits other control mechanisms 2, directly connecting the contactor 3 to the power supply terminal to form a power line. This allows for rapid switching to the emergency start control system to supply power to the downstream actuator 4, thereby facilitating the fastest emergency start of the overhead crane, minimizing the occurrence of accidents, and promoting stable production operation. Furthermore, considering the unavoidable possibility of contactor 3 malfunctioning, this embodiment also includes a selector switch SB2 for short-circuiting contactor 3. In practical applications, when only contactor 3 is malfunctioning, selector switch SB2 can be closed, so that the power supply line at the front end of contactor 3 can supply power to the actuator 4 at the back end through selector switch SB2.

[0015] Considering that the actuator 4 at the back end has no contactor 3 protection when the selector switch SB2 is closed, this embodiment connects a protector 6 in series with the selector switch SB2 to provide overcurrent / short circuit protection for the power supply line of the actuator 4.

[0016] In this embodiment, the output end of the control mechanism 2 is connected to the monitoring mechanism 5, which is used to monitor the abnormalities of each sub-component in the control mechanism 2.

[0017] Specifically, the monitoring mechanism includes relays KTn in a number matching the number of sub-components Kn in control mechanism 2. Multiple relays KTn are connected one-to-one with each sub-component Kn in control mechanism 2. One end of the coil of relay KTn is electrically connected to the output terminal of sub-component Kn, the other end of the coil is grounded, the common terminal of relay KTn is electrically connected to the output terminal of sub-component Kn, and the normally open contact of relay KTn is grounded via an indicator light. When sub-component Kn of control mechanism 2 is operating normally, its output terminal outputs an electrical signal. This signal is simultaneously received by its corresponding relay KTn, causing relay KTn to activate. The normally open contact of relay KTn closes, and the indicator light illuminates, indicating that the corresponding sub-component Kn is operating normally. Since the sub-components Kn of control mechanism 2 are connected in series, when one sub-component malfunctions, the other sub-components downstream of it will also malfunction and stop working. Therefore, based on the design principle of control mechanism 2, when multiple consecutive indicator lights are off, the sub-component Kn connected in series with the off-light indicator light is identified as the malfunctioning sub-component, thus enabling monitoring of control mechanism 2. When multiple sub-components malfunction, the fault of the sub-component Kn corresponding to the off-light indicator light and located at the beginning of the series circuit is eliminated first. After the fault is eliminated, the indicator light corresponding to that sub-component Kn will be lit. Then, the sub-components Kn corresponding to the off-light indicator lights and located at the beginning of the series circuit are eliminated in the same manner. For example, in Figure 3 If sub-components K1 and K2 malfunction, all indicator lights will be off. First, troubleshoot sub-component K1. Once resolved, the indicator light corresponding to sub-component K1 will illuminate. However, since sub-component K2 is also malfunctioning, the indicator light corresponding to sub-component K2, and all other indicator lights except those corresponding to sub-component K1, will be off. Once the fault in sub-component K2 is resolved, all indicator lights will illuminate, indicating that all faults in control mechanism 2 have been eliminated.

[0018] In this embodiment, the indicator lights include light one L1n and light two L2n, which are connected in parallel. Light one L1n is installed in the crane's driver's cab, and light two L2n is installed on the outside of the crane. This design allows for the simultaneous generation of warning signals to both inside and outside the crane when the crane's control mechanism 2 malfunctions, thus alerting both the driver and external personnel. This prevents the driver from neglecting to check the indicator lights while operating the crane, improving the reliability of monitoring the crane's control mechanism 2.

[0019] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model. These modifications and improvements will not affect the effectiveness of the present utility model or the practicality of the patent.

Claims

1. An emergency start control system for an overhead crane, comprising a main circuit breaker (1), a control mechanism (2), and a contactor (3); characterized in that, It also includes an emergency switch (SB1), a selector switch (SB2), and a monitoring mechanism (5); one end of the emergency switch (SB1) is electrically connected to the input end of the main circuit breaker (1), and the other end of the emergency switch (SB1) is electrically connected to both the input end of the contactor (3) and one end of the selector switch (SB2), and the other end of the selector switch (SB2) is electrically connected to the output end of the contactor (3); the output end of the control mechanism (2) is connected to the monitoring mechanism (5).

2. The crane emergency start control system according to claim 1, characterized in that, The monitoring mechanism includes relays (KTn) in the same number as the sub-components (Kn) of the control mechanism (2); multiple relays (KTn) are connected one-to-one with the sub-components (Kn) of the control mechanism (2), one end of the coil of the relay (KTn) is electrically connected to the output terminal of the sub-component (Kn), the other end of the coil of the relay (KTn) is grounded, the common terminal of the relay (KTn) is electrically connected to the output terminal of the sub-component (Kn), and the normally open contact of the relay (KTn) is grounded through an indicator light.

3. The overhead crane emergency start control system according to claim 2, characterized in that, The indicator light includes a first light (L1n) and a second light (L2n), which are connected in parallel. The first light (L1n) is installed in the cab of the crane, and the second light (L2n) is installed on the outside of the crane.

4. The overhead crane emergency start control system according to claim 1, characterized in that, The selector switch is electrically connected to the output terminal of the contactor (3) via the protector (6).

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