Bridge crane fault detection device

Abstract

The utility model relates to a fault detection device for a bridge crane, which comprises a cart front limit relay, a cart back limit relay, a trolley front limit relay, a trolley back limit relay, an entrance door limit relay, a crown block walking board left door limit relay, a crown block walking board right door limit relay and a walking board entrance door limit relay, all the relays are provided with light-emitting diodes, each limiting switch independently controls one relay, and when the limiting switches work normally, the light-emitting diodes of the corresponding relays can be kept on normally; when the limit switch breaks down, a normally-on diode in a relay controlled by the limit switch is extinguished, whether the limit switch breaks down or not is judged through a light-emitting diode of the relay, maintenance personnel can quickly and visually judge the fault position, and therefore the troubleshooting time is saved, the fault processing time is shortened, and the maintenance efficiency is improved. The operation rate of crown block equipment is increased.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to a fault detection device for bridge cranes. Background Technology

[0002] Bridge cranes are large material handling equipment. Their main structure consists of the main body of the overhead crane, the trolley traveling mechanism, the auxiliary trolley traveling mechanism, and the grab bucket lifting and opening / closing mechanism. In the coking production process, their function is to transport coking coal. The material is transported by the horizontal movement of the overhead crane's trolley and auxiliary trolley, and by the lifting, opening, and closing of the grab bucket.

[0003] The electrical system of a bridge crane mainly consists of three parts: a power supply system, a control system, and a safety protection system. The safety protection system is a crucial part for the normal operation of a bridge crane.

[0004] The existing door limit protection switches and the limit protection switches of the overhead crane traveling mechanism and the trolley traveling mechanism are used by connecting multiple normally closed contacts of limit switches in series. Because multiple limit switches are connected in series, once a limit switch fails, the entire limit switch circuit is in an open circuit state. When troubleshooting, it is impossible to determine which limit switch is faulty at the first time. It is necessary to check and judge multiple limit switches one by one. This has problems such as many troubleshooting points, difficulty in judging the fault point, and slow troubleshooting. Summary of the Invention

[0005] This invention provides a fault detection device for bridge cranes, in which each limit switch individually controls a relay. The LED of the relay determines whether the limit switch is faulty, enabling maintenance personnel to quickly and intuitively identify which limit switch is faulty, saving troubleshooting time, reducing fault handling time, and improving maintenance efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A bridge crane fault detection device includes a main control circuit, a trolley control circuit, a trolley control circuit, a trolley front limit switch, a trolley retraction limit switch, a trolley front limit switch, a trolley retraction limit switch, and an entrance door limit switch. It also includes a crane platform left door limit switch, a crane platform right door limit switch, a platform entrance door limit switch, a trolley front limit relay, a trolley retraction limit relay, a trolley front limit relay, a trolley retraction limit relay, an entrance door limit relay, a crane platform left door limit relay, a crane platform right door limit relay, and a platform entrance door limit relay.

[0008] The trolley front limit relay, trolley back limit relay, trolley front limit relay, trolley back limit relay, entrance door limit relay, overhead crane platform left door limit relay, overhead crane platform right door limit relay, and platform entrance door limit relay are all relays equipped with light-emitting diodes.

[0009] The trolley front limit switch and trolley back limit switch are respectively set at the front and rear limit positions of the trolley of the bridge crane. The trolley front limit switch and trolley back limit switch are respectively set at the front and rear limit positions of the trolley of the bridge crane. The entrance door limit switch is set at the entrance of the cab. The crane platform left door limit switch is set at the personnel entry point on the left side of the crane platform. The crane platform right door limit switch is set at the personnel entry point on the right side of the crane platform. The platform entrance door limit switch is set at the platform entrance.

[0010] The main control circuit is connected in series with the opening contacts of the entrance door limit relay, the opening contacts of the left door limit relay of the crane platform, the opening contacts of the right door limit relay of the crane platform, and the opening contacts of the entrance door limit relay of the platform, forming a self-locking circuit of the main control circuit.

[0011] The forward circuit in the trolley control circuit is connected in series with the closed contact of the trolley front limit relay, and the reverse circuit in the trolley control circuit is connected in series with the closed contact of the trolley retraction limit relay.

[0012] The forward circuit in the trolley control circuit is connected in series with the closed contact of the trolley front limit relay; the reverse circuit in the trolley control circuit is connected in series with the closed contact of the trolley reverse limit relay.

[0013] The trolley front limit switch is connected in series with the trolley front limit relay coil; the trolley retraction limit switch is connected in series with the trolley retraction limit relay coil; the trolley front limit switch is connected in series with the trolley front limit relay coil; the trolley retraction limit switch is connected in series with the trolley retraction limit relay coil; the entrance door limit switch is connected in series with the entrance door limit relay coil; the crane platform left door limit switch is connected in series with the crane platform left door limit relay coil; the crane platform right door limit switch is connected in series with the crane platform right door limit relay coil; and the platform entrance door limit switch is connected in series with the platform entrance door limit relay coil.

[0014] Furthermore, the main control circuit includes an emergency stop button, a stop button, a start button, a trolley zero-position limit switch, a trolley zero-position limit switch, and a main circuit contactor. The emergency stop button, stop button, start button, trolley zero-position limit switch, trolley zero-position limit switch, entrance door limit relay open, crane platform left door limit relay open, crane platform right door limit relay open, and platform entrance door limit relay open are connected in series to the main circuit contactor coil. The main circuit contactor open is connected in parallel to the series circuit of the start button, trolley zero-position limit switch, and trolley zero-position limit switch. The main circuit contactor open is connected in series to the trolley control circuit and the trolley control circuit.

[0015] Furthermore, the trolley control circuit includes a cam controller A, a trolley forward contactor, and a trolley backward contactor. One open contact of the cam controller A is connected in series with the closed contact of the trolley forward limit relay, the closed contact of the trolley backward contactor, and the coil of the trolley forward contactor. The other open contact of the cam controller A is connected in series with the closed contact of the trolley backward limit relay, the closed contact of the trolley forward contactor, and the coil of the trolley backward contactor.

[0016] Furthermore, the trolley control circuit includes a cam controller B, a trolley forward contactor, and a trolley reverse contactor. One open contact of the cam controller B is connected in series with the closed contact of the trolley forward limit relay, the closed contact of the trolley reverse contactor, and the coil of the trolley forward contactor. The other open contact of the cam controller B is connected in series with the closed contact of the trolley retraction limit relay, the closed contact of the trolley forward contactor, and the coil of the trolley reverse contactor.

[0017] Furthermore, it also includes a circuit breaker, the input end of which is connected to an external power supply, and the output end is connected to the following limit switches: trolley front limit switch, trolley back limit switch, trolley front limit switch, trolley back limit switch, entrance door limit switch, crane platform left door limit switch, crane platform right door limit switch, and platform entrance door limit switch.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1) Quickly locate the fault: Each limit switch controls a relay individually. When the limit switch is working normally, the corresponding relay's LED will remain constantly lit. When the limit switch malfunctions, the constantly lit LED in the relay controlled by the limit switch will turn off. By observing the LED of the relay, it is possible to determine whether the limit switch has malfunctioned. This allows maintenance personnel to quickly and intuitively identify the location of the fault, thus saving troubleshooting time.

[0020] 2) Reduce fault handling time: By visually observing the on / off status of the relay diode, the fault location of the limit switch can be found, which greatly shortens the fault diagnosis time and reduces the fault handling time of the limit switch.

[0021] 3) Increase the operating rate of overhead crane equipment: After the limit switch fails, timely and accurate fault diagnosis is the key to ensuring the stable operation of overhead crane equipment. By improving the efficiency and accuracy of fault diagnosis, the operating rate of overhead crane equipment is enhanced, and the decline in the operating rate of overhead crane due to failure to diagnose and handle faults in a timely manner is reduced. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of the bridge crane described in this utility model.

[0023] Figure 2 This is a schematic diagram of the control circuit structure of this utility model.

[0024] In the diagram: 1. Platform entrance; 2. Driver's cab; 3. Large trolley; 4. Small trolley; 5. Overhead crane platform. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0026] See Figure 1-2 This is a structural schematic diagram of the present invention. The present invention relates to a fault detection device for a bridge crane, comprising a main control circuit, a trolley control circuit, a trolley control circuit, a trolley front limit switch XW1, a trolley retraction limit switch XW2, a trolley front limit switch XW3, a trolley retraction limit switch XW4, an entrance door limit switch XW5, a crane platform left door limit switch XW6, a crane platform right door limit switch XW7, a platform entrance 1 door limit switch XW8, a trolley front limit relay K7, a trolley retraction limit relay K8, a trolley front limit relay K5, a trolley retraction limit relay K6, an entrance door limit relay K1, a crane platform left door limit relay K2, a crane platform right door limit relay K3, and a platform entrance 1 door limit relay K4.

[0027] The trolley front limit switch XW1 and trolley back limit switch XW2 are respectively set at the forward and backward limit positions of the trolley 3 of the bridge crane. The trolley front limit switch XW3 and trolley back limit switch XW4 are respectively set at the forward and backward limit positions of the trolley 4 of the bridge crane. The entrance door limit switch XW5 is set at the entrance of the cab 2. The crane platform left door limit switch XW6 is set at the personnel entrance on the left side of the crane platform 5. The crane platform right door limit switch XW7 is set at the personnel entrance on the right side of the crane platform 5. The platform entrance door limit switch XW8 is set at the platform entrance 1.

[0028] The main trolley front limit relay K7, main trolley reversing limit relay K8, trolley front limit relay K5, trolley reversing limit relay K6, entrance door limit relay K1, overhead crane platform left door limit relay K2, overhead crane platform right door limit relay K3, and platform entrance 1 door limit relay K4 are all relays equipped with light-emitting diodes.

[0029] The main control circuit includes an emergency stop button JT, a stop button TZ, a start button QD, a trolley zero-position limit switch DL, a trolley zero-position limit switch XL, and a main circuit contactor KM. The emergency stop button JT, stop button TZ, start button QD, trolley zero-position limit switch DL, trolley zero-position limit switch XL, entrance door limit relay K1 (closed), crane platform left door limit relay K2 (open), crane platform right door limit relay K3 (open), and platform entrance 1 door limit relay K4 (open) are connected in series to the coil of the main circuit contactor KM. The open contact of the main circuit contactor KM is connected in parallel to the series circuit of the start button QD, trolley zero-position limit switch DL, and trolley zero-position limit switch XL. The open contact of the main circuit contactor KM is connected in series to the power input terminals of the trolley control circuit and the trolley control circuit.

[0030] The trolley control circuit includes a cam controller A, a trolley forward contactor KM1, and a trolley backward contactor KM2. One open contact of the cam controller A is connected in series with the closed contact of the trolley forward limit relay K5, the closed contact of the trolley backward contactor KM2, and the coil of the trolley forward contactor KM1. The other open contact of the cam controller A is connected in series with the closed contact of the trolley backward limit relay K6, the closed contact of the trolley forward contactor KM1, and the coil of the trolley backward contactor KM2.

[0031] The trolley control circuit includes a cam controller B, a trolley forward contactor KM4, and a trolley reverse contactor KM5. One open contact of the cam controller B is connected in series with the closed contact of the trolley forward limit relay K7, the closed contact of the trolley reverse contactor KM6, and the coil of the trolley forward contactor KM5. The other open contact of the cam controller B is connected in series with the closed contact of the trolley reversal limit relay K8, the closed contact of the trolley forward contactor KM5, and the coil of the trolley reverse contactor KM6.

[0032] The external power supply unifies the main control circuit, the trolley control circuit, the trolley control circuit, and the parallel circuit of each relay coil and limit switch. The input terminal of the circuit breaker KQ1 is connected to the external power supply, and the output terminal is connected to the trolley front limit switch XW1, trolley back limit switch XW2, trolley front limit switch XW3, trolley back limit switch XW4, entrance door limit switch XW5, crane platform left door limit switch XW6, crane platform right door limit switch XW7, and platform entrance 1 door limit switch XW8. The trolley front limit switch XW1 is connected in series with the trolley front limit relay K7 coil, and the trolley back limit switch XW5 is connected in series with the trolley front limit relay K7 coil. The trolley retraction limit switch XW2 is connected in series with the coil of the trolley retraction limit relay K8; the trolley front limit switch XW3 is connected in series with the coil of the trolley front limit relay K5; the trolley retraction limit switch XW4 is connected in series with the coil of the trolley retraction limit relay K6; the entrance door limit switch XW5 is connected in series with the coil of the entrance door limit relay K1; the crane platform left door limit switch XW6 is connected in series with the coil of the crane platform left door limit relay K2; the crane platform right door limit switch XW7 is connected in series with the coil of the crane platform right door limit relay K3; and the platform entrance 1 door limit switch XW8 is connected in series with the coil of the platform entrance 1 door limit relay K4.

[0033] Working principle: When the crane door is closed, the normally open contacts of the entrance door limit switch XW5, the crane platform left door limit switch XW6, the crane platform right door limit switch XW7, and the platform entrance 1 door limit switch XW8 are energized, relays K1, K2, K3, and K4 are energized, the LEDs are constantly lit, the normally open contact of contactor KM is energized, and the main control circuit is formed. When any one or more of the entrance door limit switch XW5, the crane platform left door limit switch XW6, the crane platform right door limit switch XW7, and the platform entrance 1 door limit switch XW8 malfunction, the normally open contact of contactor KM is opened, the main control circuit is disconnected, and maintenance personnel can immediately determine which door limit switch is malfunctioning by observing the LED status of relays K1, K2, K3, and K4.

[0034] During crane operation, when trolley 4 travels to the front or rear limit switch, the limit switch opening closes, relays K5 and K6 are energized, the LED lights up, the normally closed contacts of contactors KM2 and KM1 open, and the control circuit of trolley 4 is disconnected. When a mechanical fault occurs in the trolley travel limit switch, such as when trolley 4 moves away and the limit switch mechanism does not spring back, maintenance personnel can immediately determine the fault point by observing the status of the corresponding relays.

[0035] During crane operation, when the trolley 3 travels to the front or rear limit switch, the limit switch opening closes, relays K7 and K8 are energized, the LEDs light up, the normally closed contacts of contactors KM3 and KM4 open, and the trolley control circuit is disconnected. When a mechanical fault occurs in the trolley travel limit switch, such as when the trolley 3 moves away and the limit switch mechanism does not spring back, maintenance personnel can immediately determine the fault point by observing the status of the corresponding relays.

[0036] The above embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the above embodiments. Unless otherwise specified, the methods used in the above embodiments are conventional methods.

Claims

1. A bridge crane failure detection device comprising a main control circuit, a trolley control circuit, a trolley control circuit, a trolley front limit switch, a trolley retreat limit switch, a trolley front limit switch, a trolley retreat limit switch, and an entrance gate limit switch, characterized in that, The crane walkway left door limit switch, the crane walkway right door limit switch, the walkway entrance door limit switch, the trolley front limit relay, the trolley retreat limit relay, the trolley front limit relay, the trolley retreat limit relay, the entrance door limit relay, the crane walkway left door limit relay, the crane walkway right door limit relay and the walkway entrance door limit relay are further included. The trolley front limit relay, the trolley retreat limit relay, the trolley front limit relay, the trolley retreat limit relay, the entrance door limit relay, the crane walkway left door limit relay, the crane walkway right door limit relay and the walkway entrance door limit relay are all relays with light-emitting diodes. The trolley front limit switch, the trolley retreat limit switch, the entrance door limit switch, the crane walkway left door limit switch, the crane walkway right door limit switch and the walkway entrance door limit switch are respectively arranged at the walking front and rear limit positions of the bridge crane, the trolley front limit switch, the trolley retreat limit switch, the entrance door limit switch, the crane walkway left door limit switch, the crane walkway right door limit switch and the walkway entrance door limit switch are respectively arranged at the walking front and rear limit positions of the bridge crane, the entrance door limit is arranged at the entrance of the cab, the crane walkway left door limit switch is arranged at the left side of the crane walkway, the crane walkway right door limit switch is arranged at the right side of the crane walkway, and the walkway entrance door limit switch is arranged at the entrance of the sky bridge. The main control loop is connected in series with the entrance door limit relay open point, the crane walkway left door limit relay open point, the crane walkway right door limit relay open point and the walkway entrance door limit relay open point, and constitutes a self-locking circuit of the main control loop. The forward circuit in the trolley control loop is connected in series with the trolley front limit relay closed point, and the backward circuit in the trolley control loop is connected in series with the trolley retreat limit relay closed point. The forward circuit in the trolley control loop is connected in series with the trolley front limit relay closed point, and the backward circuit in the trolley control loop is connected in series with the trolley retreat limit relay closed point. The trolley front limit switch is connected in series with the trolley front limit relay coil, the trolley retreat limit switch is connected in series with the trolley retreat limit relay coil, the trolley front limit switch is connected in series with the trolley front limit relay coil, the trolley retreat limit switch is connected in series with the trolley retreat limit relay coil, the entrance door limit switch is connected in series with the entrance door limit relay coil, the crane walkway left door limit switch is connected in series with the crane walkway left door limit relay coil, the crane walkway right door limit switch is connected in series with the crane walkway right door limit relay coil, and the walkway entrance door limit switch is connected in series with the walkway entrance door limit relay coil.

2. A bridge crane fault detection apparatus according to claim 1, characterised in that, The main control loop includes an emergency stop button, a stop button, a start button, a trolley zero limit switch, a trolley zero limit switch and a main loop contactor, the emergency stop button, the stop button, the start button, the trolley zero limit switch, the trolley zero limit switch, the entrance door limit relay open point, the crane walkway left door limit relay open point, the crane walkway right door limit relay open point and the walkway entrance door limit relay open point are connected in series and then connected to the main loop contactor coil, the main loop contactor open point is connected in parallel to the series circuit of the start button, the trolley zero limit switch and the trolley zero limit switch, and the main loop contactor open point is connected in series to the trolley control loop and the trolley control loop.

3. A bridge crane fault detection apparatus according to claim 1, characterized in that, The trolley control circuit comprises a cam controller A, a trolley forward contactor and a trolley backward contactor, one open point of the cam controller A is connected in series with a trolley forward limit relay closed point, a trolley backward contactor closed point and a trolley forward contactor coil, and the other open point of the cam controller A is connected in series with a trolley backward limit relay closed point, a trolley forward contactor closed point and a trolley backward contactor coil.

4. A bridge crane fault detection apparatus according to claim 1, characterized in that, The large car control circuit comprises a cam controller B, a large car forward contactor and a large car backward contactor, one open point of the cam controller B is connected in series with a large car forward limit relay closed point, a large car backward contactor closed point and a large car forward contactor coil, and the other open point of the cam controller B is connected in series with a large car backward limit relay closed point, a large car forward contactor closed point and a large car backward contactor coil.

5. A bridge crane fault detection apparatus according to claim 1, wherein, The circuit further comprises a circuit breaker, an input end of the circuit breaker is connected with an external power supply, and output ends of the circuit breaker are connected with a large car forward limit switch, a large car backward limit switch, a trolley forward limit switch, a trolley backward limit switch, an entrance door limit switch, a headframe walkway left door limit switch, a headframe walkway right door limit switch and a walkway entrance door limit switch.

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