Switch machine control circuit

Abstract

The utility model discloses a switch machine control circuit. A fixed operation relay ADC and a fixed operation relay BDC form double relays of a fixed operation drive circuit. The reverse operation relay AFC and the reverse operation relay BFC form double relays of the reverse operation driving circuit; normally open contacts of the double relays of the constant operation driving circuit and the reverse operation driving circuit are connected in series in a switch machine driving loop; the normally closed contacts are connected in series in the switch machine representation acquisition loop, the representation acquisition loop is disconnected when the switch machine is driven, and the switch machine driving loop and the switch machine representation acquisition loop form a mutual exclusion relationship; the switch machine driving loop is connected in series with a current transformer; an indication diode is arranged in the point switch indication acquisition loop, and the current positioning or reverse position state of the point switch is directly displayed through the indication diode. According to the circuit, an onboard small elastic relay and a semiconductor device are used for achieving control and expression collection of a point switch, and the problem that a gravity relay is large in size is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of railway signal control systems, in particular to a switch machine control circuit. Background Art

[0002] At present, with the development of electronic technology, the railway signal control system has developed to the microcomputer interlocking stage. The logic operation part is replaced by a microcomputer, and the execution control part adopts a solution combining a general IO electronic board and a gravity relay. The gravity relay is still retained at the interface layer. Among them, the ZD6 electric switch turnout control circuit adopts an electrical logic circuit composed of multiple relays. Usually, the gravity relay used is large in size. As a mechanical component, it has the risk of wear and failure, and is also easily affected by environmental factors and workload. Therefore, the control circuit has the disadvantages of large size, high energy consumption, long construction period, high maintenance cost, insufficient mechanical wear stability, and slow response speed.

[0003] The traditional microcomputer interlocking system uses a microcomputer as the computing core, replacing the complex relay logic operation function, but the collection and control of external equipment is achieved through a combination of electronic boards and gravity relays. The switch machine is still controlled by a gravity relay. In this regard, there is no improvement compared with the 6502 electrical centralized circuit. Its disadvantage is still that the gravity relay is large in size and occupies more space. The control circuit needs to consider the design requirements of the electronic board and the gravity relay at the same time, resulting in the complexity of the circuit structure and the difficulty of wiring, which increases the cost and maintenance workload of the system. Summary of the invention

[0004] The utility model aims to provide a switch machine control circuit, which uses a small on-board elastic relay and a semiconductor device to realize the control and display collection of the switch machine, so as to solve the problems that the gravity relay is large in size, occupies more space, is difficult to maintain and has high cost.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A switch machine control circuit, the control circuit includes a fixed operating relay ADC, a fixed operating relay BDC, an anti-operating relay AFC, an anti-operating relay BFC, a switch machine drive circuit, a switch machine indication collection circuit, and a current sensor, wherein:

[0007] The fixed-operation relay ADC and the fixed-operation relay BDC form a double relay of the fixed-operation driving circuit; the anti-operation relay AFC and the anti-operation relay BFC form a double relay of the anti-operation driving circuit;

[0008] The normally open contacts of the double relays of the fixed operation drive circuit and the double relays of the reverse operation drive circuit are connected in series in the switch machine drive circuit;

[0009] The normally closed contacts of the double relays of the fixed operation driving circuit and the double relays of the reverse operation driving circuit are connected in series in the switch machine indication and collection circuit. When the switch machine is driven, the indication and collection circuit is disconnected, and the switch machine driving circuit and the switch machine indication and collection circuit form a mutually exclusive relationship.

[0010] A current transformer is connected in series to the switch machine driving circuit, and the current transformer uses both fixed and reverse currents;

[0011] The switch machine indicates that an indicator diode is provided in the acquisition circuit, and the current positioning or reverse position status of the switch machine is directly displayed through the indicator diode.

[0012] It can be seen from the technical solution provided by the above-mentioned utility model that the above-mentioned circuit uses on-board small elastic relays and semiconductor devices to realize the control and display collection of the switch machine, so as to solve the problems of large size of gravity relays, large space occupation, difficult maintenance and high cost, thereby integrating the large and complex turnout drive combination into a very small electronic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 A schematic diagram of the structure of a switch machine control circuit provided by an embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the working process of the fixed-operation driving circuit of the utility model;

[0016] Figure 3 It is a schematic diagram of the working process of the positioning and display acquisition circuit of the utility model;

[0017] Figure 4 This is a schematic diagram of the working process of the reverse driving circuit of the utility model;

[0018] Figure 5 It is a schematic diagram of the working process of the reverse bit representation acquisition circuit of the utility model;

[0019] Figure 6 The utility model is a schematic diagram showing the structure of the acquisition circuit of the switch machine. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments, which does not constitute a limitation of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0021] like Figure 1 The figure shows a schematic diagram of the structure of the switch machine control circuit provided by the embodiment of the utility model. The control circuit mainly includes a fixed operating relay ADC, a fixed operating relay BDC, an anti-operating relay AFC, an anti-operating relay BFC, a switch machine drive circuit, a switch machine indication collection circuit, and a current sensor, wherein:

[0022] The fixed-operation relay ADC and the fixed-operation relay BDC form a double relay of the fixed-operation driving circuit; the anti-operation relay AFC and the anti-operation relay BFC form a double relay of the anti-operation driving circuit;

[0023] The normally open contacts of the double relays of the fixed-operation drive circuit and the double relays of the reverse-operation drive circuit are connected in series in the switch machine drive circuit; since the action of a single relay will not lead to drive output, this structure forms a two-out-of-two voting mechanism;

[0024] The normally closed contacts of the double relays of the fixed operation driving circuit and the double relays of the reverse operation driving circuit are connected in series in the switch machine indication and collection circuit. When the switch machine is driven, the indication and collection circuit is disconnected, and the switch machine driving circuit and the switch machine indication and collection circuit form a mutually exclusive relationship.

[0025] A current transformer is connected in series to the switch machine driving circuit. The current transformer uses both fixed and reverse currents, and can determine whether the switch machine is rotating by the presence or absence of current.

[0026] The switch machine indicates that an indicator diode is provided in the acquisition circuit, and the current positioning or reverse position status of the switch machine is directly displayed through the indicator diode.

[0027] In a specific implementation, the relay used in the control circuit is a small spring-type relay, including all on-board small spring-type relays, contactors, etc.; specifically, it can be a combination of one or more relays of different models or different contact numbers. The control circuit can realize the control and display collection of the switch machine by using the on-board small spring-type relay and semiconductor devices.

[0028] like Figure 2 FIG. 1 is a schematic diagram showing the working process of the fixed-operation driving circuit of the utility model. Figure 2As shown by the black solid line in the figure, in the fixed operation drive circuit, when the fixed operation command is issued, the fixed operation relay ADC and the fixed operation relay BDC are attracted, the switch machine indication acquisition circuit is disconnected, and the fixed operation drive circuit is connected;

[0029] When the fixed relays ADC and BDC are simultaneously pulled up, the driving current passes through the current sensor, the fixed relays ADC and BDC, the switch machine X1, X4 interface, the reverse relays BFC and AFC, and then returns to the negative power supply DF. If one of the four relays is not in the specified position, it cannot be driven, which complies with the principle of fault-oriented safety.

[0030] like Figure 3 FIG. 1 is a schematic diagram showing the working process of the positioning and indicating acquisition circuit of the utility model. Figure 3 As shown by the black solid line in the figure, when the switch machine turns to the fixed position, the drive circuit is automatically disconnected. After the CPU collects and determines that there is no current through the current transformer, the reverse control relays BFC and AFC fall down, and the positioning indication collection circuit is connected; at this time, the indicator diode inside the switch machine is connected between the X3 and X1 interfaces of the switch machine, and only the current is allowed to flow from X3 to X1, so that the two CPUs can collect the positioning indication signal.

[0031] like Figure 4 FIG. 1 is a schematic diagram showing the working process of the reverse driving circuit of the utility model. Figure 4 As shown by the black solid line in the figure, in the reverse operation drive circuit, when the reverse operation command is issued, the reverse operation relay AFC and the reverse operation relay BFC are energized, the switch machine indication collection circuit is disconnected, and the reverse operation drive circuit is connected.

[0032] In the reverse operation driving circuit, the reverse operation relay AFC and the reverse operation relay BFC are simultaneously sucked up, and the driving current passes through the current sensor, the fixed operation relays ADC and BDC, the switch machine X2 and X4 interfaces, the reverse operation relays BFC and AFC, and finally returns to the negative power supply DF. If one of the four relays is not in the specified position, it cannot be driven, which complies with the principle of fault-oriented safety.

[0033] like Figure 5 FIG. 1 is a schematic diagram showing the working process of the reverse bit representation acquisition circuit of the utility model. Figure 5 As shown by the black solid line in the figure, when the switch machine turns to the reverse position, the drive circuit is automatically disconnected. After the CPU collects and determines that there is no current through the current transformer, the reverse operation relay AFC and the reverse operation relay BFC fall down, and the reverse position indication collection circuit is connected; at this time, the internal diode of the switch machine is connected between X2 and X3, and only current is allowed to flow from X2 to X3, so that the two CPUs can collect the reverse position indication signal.

[0034] like Figure 6The figure shows a schematic diagram of the structure of the switch machine acquisition circuit of the utility model, wherein the switch machine acquisition circuit includes protection diodes D3 and D4, electrolytic capacitors C1 and C2, current limiting resistors R9 and R10, light emitting diodes D1 and D2, current limiting resistors R1, R3, R5, R7, and shunt resistors R2, R4, R6, R8; wherein:

[0035] The 220-110V transformer is connected to the switch machine X1 or X2 interface through a resistor and a diode;

[0036] The electrolytic capacitor and the diode are combined into a half-wave rectifier circuit to provide a stable indication voltage.

[0037] In the switch machine indication collection circuit, the protection diodes D3 and D4 can absorb excessive surge impact and effectively protect other devices from damage;

[0038] Electrolytic capacitors C1 and C2 act as a rectifier to keep the voltage stable;

[0039] Current limiting resistors R9 and R10 are used to provide appropriate current to the fixed or reverse light emitting diodes D1 and D2;

[0040] Resistors R1, R2, R3, R4, R5, R6, R7, and R8 are used to adjust the signal acquisition threshold by selecting reasonable resistance values.

[0041] Based on the structure of the above control circuit, the working process of the control circuit is:

[0042] Signal detection: The switch control circuit will first receive control signals from the signal system. These signals indicate which position the turnout should be switched to. Through the signal detection part, the control circuit will detect the current position and locking status of the turnout to ensure safe operation.

[0043] Action execution: According to the control signal received, the control circuit will start the motor and drive the switch machine to adjust the position; the switch machine switches the switch position through a mechanical structure, so that the switch can run along the specified path.

[0044] Feedback detection: After the switch position adjustment is completed, the control circuit will perform feedback detection, detecting the actual position and status of the switch through the built-in sensor or encoder. This information will be fed back to the signal system to ensure that the switch has been successfully switched to the specified position.

[0045] It is worth noting that the contents not described in detail in the embodiments of the present utility model belong to the prior art known to the professional and technical personnel in the field. For example: some or all relays can be replaced with semiconductor electronic switches, including but not limited to thyristors, thyristors, IGBTs, etc.; semiconductor electronic switches, including but not limited to thyristors, thyristors, IGBTs, etc., can be added to the relay series circuit to enhance the safety of the control circuit, increase the current breaking capacity, etc.; use a current sensor to complete the current collection, or use two current sensors connected in series in the fixed operation and reverse operation circuits to complete the current collection function; all electronic device parameters are recommended parameters, which can be adjusted to other parameter values ​​according to actual conditions.

[0046] In summary, the switch machine control circuit of the utility model has the following advantages:

[0047] 1) High safety: All the driving and mining circuits in the utility model are controlled by two relays in series, which is a two-out-of-two structure, conforming to the principle of fault-oriented safety and having high safety;

[0048] 2) High reliability: It uses reliable electronic components and signal transmission technology, and has high reliability; the system design has been strictly tested and verified, and can operate stably under various complex environmental conditions;

[0049] 3) High maintainability: The turnout module of this utility model has a complete self-checking function, can give an alarm in real time, quickly locate, support hot plugging, timely replacement, and rapid recovery of operation;

[0050] 4) Low cost: The utility model completely eliminates the gravity relay and adopts low-cost semiconductor devices, which are easy to produce and process, greatly reducing the cost. In addition, due to the reduction in space, the space demand for the computer room is also greatly reduced, which can significantly reduce the cost of construction projects.

[0051] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the utility model, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A switch machine control circuit, characterized in that: The control circuit includes a fixed operating relay ADC, a fixed operating relay BDC, an anti-operating relay AFC, an anti-operating relay BFC, a switch machine drive circuit, a switch machine indication collection circuit, and a current sensor, wherein: The fixed-operation relay ADC and the fixed-operation relay BDC form a double relay of the fixed-operation driving circuit; the anti-operation relay AFC and the anti-operation relay BFC form a double relay of the anti-operation driving circuit; The normally open contacts of the double relays of the fixed operation drive circuit and the double relays of the reverse operation drive circuit are connected in series in the switch machine drive circuit; The normally closed contacts of the double relays of the fixed operation driving circuit and the double relays of the reverse operation driving circuit are connected in series in the switch machine indication and collection circuit. When the switch machine is driven, the indication and collection circuit is disconnected, and the switch machine driving circuit and the switch machine indication and collection circuit form a mutually exclusive relationship. A current transformer is connected in series to the switch machine driving circuit, and the current transformer uses both fixed and reverse currents; The switch machine indicates that an indicator diode is provided in the acquisition circuit, and the current positioning or reverse position status of the switch machine is directly displayed through the indicator diode.

2. The switch machine control circuit according to claim 1, characterized in that: In the fixed operation drive circuit, when the fixed operation command is issued, the fixed operation relay ADC and the fixed operation relay BDC are energized, the switch machine indication acquisition circuit is disconnected, and the fixed operation drive circuit is connected.

3. The switch machine control circuit according to claim 1, characterized in that: In the reverse operation drive circuit, when the reverse operation command is issued, the reverse operation relay AFC and the reverse operation relay BFC are energized, the switch machine indication collection circuit is disconnected, and the reverse operation drive circuit is connected.

4. The switch machine control circuit according to claim 1, characterized in that: The switch machine indicates that the acquisition circuit includes protection diodes D3 and D4, electrolytic capacitors C1 and C2, current limiting resistors R9 and R10, light emitting diodes D1 and D2, current limiting resistors R1, R3, R5, R7, and shunt resistors R2, R4, R6, R8; wherein: The 220-110V transformer is connected to the switch machine X1 or X2 interface through a resistor and a diode; The electrolytic capacitor and the diode are combined into a half-wave rectifier circuit to provide a stable indication voltage.

5. The switch machine control circuit according to claim 1, characterized in that: The relay used in the control circuit is a small elastic relay, specifically a combination of one or more relays of different models or different numbers of contacts.

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