An electronic analog device for a four-wire DC switch machine

Abstract

The present invention discloses an electronic simulation device for a four-wire DC switch machine, which includes a forced guidance type safety relay, a first Hall current sensor, a second Hall current sensor, a first resistor, a second resistor, a diode, a positioning drive indicator light, a reverse position drive indicator light, a positioning indication indicator light, and a reverse position indication indicator light. The secondary coils of the first Hall current sensor and the second Hall current sensor control the operation of the forced guidance type safety relay through an indicator light control circuit and light up the positioning drive indicator light, the reverse position drive indicator light, the positioning indication indicator light, and the reverse position indication indicator light. The indicator light control circuit includes a first field effect transistor, a second field effect transistor, and a magnetic latching relay. The electronic simulation device for a four-wire DC switch machine of the present invention has a simple structure, a small volume, a light weight, is convenient to install, and is more in line with the characteristics of a real four-wire switch machine.

Description

Technical Field

[0001] The present invention relates to an electronic simulation device for a four-wire DC switch machine. Background Art

[0002] The switch machine in the fields of railways and rail transit is an actuator of the turnout control system. It is an important signal basic equipment used to reliably switch the position of the turnout, change the opening direction of the turnout, lock the switch rail of the turnout, and reflect the position of the turnout. It can well ensure the safety of train operation, improve the transportation efficiency, and reduce the labor intensity of train operation personnel. The ZD6 series of four-wire DC switch machines are one of the most widely used switch machines at present. In signal interface debugging or in scientific research and teaching in relevant majors in colleges and universities, if an actual switch machine is used for debugging or demonstration, there are many disadvantages as follows:

[0003] 1. The actual switch machine occupies at least 2 m 2 , weighs about 160 kg, and is not convenient to install;

[0004] 2. The actual switch machine generates a large amount of motor noise during operation;

[0005] 3. When the actual switch machine rotates, the torque is large when the operating rod extends and retracts, and there is a potential safety hazard to personnel;

[0006] 4. The actual switch machine takes a relatively long time to rotate in place, usually about 6 s;

[0007] 5. The actual switch machine has no intuitive status indication for positioning drive, reverse drive, positioning indication, and reverse indication;

[0008] 6. The actual switch machine has a complex structure, including a DC motor, a switch, and a mechanical device;

[0009] 7. The actual switch machine is expensive, and the price of one is about 20,000 yuan.

[0010] The automatic switch of the actual four-wire switch machine has eight nodes, namely four normally open nodes and four normally closed nodes, and the normally open nodes and the normally closed nodes are mutually exclusive and will not close simultaneously (see Figure 1 ).

[0011] CN113804995 discloses an automatic simulation device and operation method for a four-wire DC switch machine. This technical solution has the following defects:

[0012] 1) This technical solution cannot fully and truly simulate the characteristics of the switch machine, which will affect the test of the actual turnout control equipment;

[0013] 2) In this technical solution, six magnetic latching relays are used to simulate the automatic switch in the four-wire DC switch machine. Additionally, an extra voltage monitoring relay and two time relays are required to control these six magnetic latching relays, resulting in a large number of components. Moreover, with six magnetic latching relays, there are six independent opening and closing nodes, which are prone to adhesion and failure. When collecting the indication, it may cause the indication current to be shunted by the drive circuit, leading to incorrect indication acquisition. When driving, it may cause a short circuit between the drive and indication circuits, resulting in overcurrent short circuit in the conduction circuit and posing a safety risk.

[0014] 3) In this technical solution, two conduction circuits are used to simulate the indication circuit of the four-wire DC switch machine, namely, diode D1 and LED1 are in parallel, and diode D2 and LED2 are in parallel. However, in the actual four-wire DC switch machine, the indication circuit only consists of one diode. According to the unidirectional conduction characteristic of this diode, the position or reverse position is determined by whether the indicated alternating current is rectified into a positive half-wave or a negative half-wave after passing through the diode. If this diode is open-circuited or short-circuited and fails, neither the position nor the reverse position can be collected. This technical solution uses two diodes to represent the position and reverse position respectively. Even if one diode fails, the other diode can still give an indication, which does not conform to the situation of the actual switch machine. Additionally, in this technical solution, the diode and the LED are in parallel. Since the LED also has the unidirectional conduction characteristic of the diode, when the diode fails, the LED will replace the diode, and it is impossible to know the cause of the circuit failure. Summary of the Invention

[0015] The object of the present invention is to overcome the defects of the prior art and provide an electronic simulation device for a four-wire DC switch machine, which has a simple structure, small volume, light weight, convenient installation, and is more in line with the characteristics of the actual four-wire switch machine.

[0016] The object of the present invention is achieved as follows: An electronic simulation device for a four-wire DC switch machine is connected to the control circuit of the four-wire DC switch machine through the first interface connection wire to the fourth interface connection wire and includes a forced guiding type safety relay, a first Hall current sensor, a second Hall current sensor, a first resistor, a second resistor, a diode, a position drive indicator light, a reverse position drive indicator light, a position indication indicator light, and a reverse position indication indicator light; wherein,

[0017] One end of the first interface connection wire is respectively connected to one end of the first normally open node and one end of the first normally closed node of the forced guiding type safety relay. The other end of the first normally open node is connected to one end of the primary coil of the first Hall current sensor. The other end of the first normally closed node is respectively connected to the cathode of the diode and one end of the fourth normally open node of the forced guiding type safety relay;

[0018] The second interface connection wires are respectively connected to one end of the second normally open node and one end of the second normally closed node of the forced guiding type safety relay. The other end of the second normally closed node is connected to one end of the primary coil of the second Hall current sensor. The other end of the second normally open node is respectively connected to the anode of the diode and one end of the third normally closed node of the forced guiding type safety relay;

[0019] The third interface connection wires are respectively connected to one end of the third normally open node and one end of the fourth normally closed node of the forced guiding type safety relay; The other end of the third normally open node is connected to one end of the fourth normally open node of the forced guiding type safety relay; The other end of the fourth normally closed node is connected to one end of the third normally closed node of the forced guiding type safety relay;

[0020] The fourth interface connection wires are respectively connected to one end of the first resistor and one end of the second resistor. The other end of the first resistor is connected to the other end of the primary coil of the first Hall current sensor. The other end of the second resistor is connected to the other end of the primary coil of the second Hall current sensor;

[0021] The secondary coils of the first Hall current sensor and the second Hall current sensor control the operation of the forced guiding type safety relay through the indicator light control circuit and light up the positioning drive indicator light, reverse position drive indicator light, positioning indication indicator light and reverse position indication indicator light.

[0022] The above-mentioned electronic analog device for a four-wire DC switch machine, wherein the indicator light control circuit includes a first field-effect transistor, a second field-effect transistor, and a magnetic latching relay; the signal output terminal of the first Hall current sensor is connected to the gate of the first field-effect transistor, the drain of the first field-effect transistor is connected to the cathode of the positioning drive indicator light and one end of the first coil of the magnetic latching relay, the other end of the first coil is connected to the digital power supply, and a third resistor and a first capacitor are connected in parallel between the gate and the source of the first field-effect transistor; the signal output terminal of the second Hall current sensor is connected to the gate of the second field-effect transistor, the drain of the second field-effect transistor is connected to the cathode of the reverse position drive indicator light and one end of the second coil of the magnetic latching relay, the other end of the second coil is connected to the digital power supply, and a fourth resistor and a second capacitor are connected in parallel between the gate and the source of the second field-effect transistor; the anode of the positioning drive indicator light is connected to the digital power supply through a fifth resistor, and the anode of the reverse position drive indicator light is connected to the digital power supply through a sixth resistor; the first static contact of the magnetic latching relay is connected to the anode of the positioning indication indicator light, the second static contact of the magnetic latching relay is connected to the anode of the reverse position indication indicator light, one end of the moving contact of the magnetic latching relay is connected to the digital power supply through a seventh resistor, the other end of the moving contact is connected to one end of the coil of the forced guiding type safety relay, and the other end of the coil of the forced guiding type safety relay is connected to the digital power supply.

[0023] The above-mentioned electronic analog device for a four-wire DC switch machine, wherein the positioning drive indicator light, the reverse position drive indicator light, the positioning indication indicator light, and the reverse position indication indicator light all adopt LED lights.

[0024] The electronic analog device for a four-wire DC switch machine of the present invention has the following characteristics:

[0025] 1) The present invention adopts a forced guiding type safety relay and a magnetic latching relay, and has higher economy compared with the prior art.

[0026] 2) The present invention adopts a forced guiding type safety relay with four normally open nodes and four normally closed nodes. The normally open and normally closed nodes will not close simultaneously, and there are no safety problems such as short circuits. The node opening and closing characteristics of the forced guiding type safety relay are consistent with the characteristics of the automatic switch of the actual four-wire switch machine, ensuring that the drive power and indication power of the switch machine will not be short-circuited together due to the failure of node opening and closing. Compared with the prior art, the present invention is more in line with the characteristics of the real four-wire switch machine and has higher safety.

[0027] 3) The present invention only uses one diode to represent the normal or reverse position state of the switch machine, and the LED indicators simulating the normal and reverse position representations of the switch machine are also controlled by an independent indicator control circuit. Compared with the prior art, the present invention is more consistent with the internal circuit of the actual switch machine and has higher reliability.

[0028] 4) The structure of the present invention is simple, small in size, light in weight, and convenient to install; it makes no noise during operation; it has a short operation time, high efficiency, and does not require personal safety protection during use; when simulating the normal drive, reverse drive, normal indication, and reverse indication of the switch machine, indicators are given respectively, which is intuitive and clear. Description of the Drawings

[0029] Figure 1 is the circuit schematic diagram of an actual four-wire DC switch machine;

[0030] Figure 2 is the circuit schematic diagram of the electronic simulation device for a four-wire DC switch machine of the present invention;

[0031] Figure 3 is the circuit schematic diagram of the indicator control circuit in the electronic simulation device for a four-wire DC switch machine of the present invention. Detailed Embodiments

[0032] The present invention will be further described below with reference to the drawings.

[0033] Please refer to Figure 2 and Figure 3 , the electronic simulation device for a four-wire DC switch machine of the present invention is connected to the four-wire DC switch machine control circuit 100 through the first interface connection wire X1, the second interface connection wire X2, the third interface connection wire X3, and the fourth interface connection wire X4, and includes a forced guiding type safety relay FR, a first Hall current sensor H1, a second Hall current sensor H2, a first resistor R1, a second resistor R2, a diode D1, a normal drive indicator L1, a reverse drive indicator L2, a normal indication indicator L3, and a reverse indication indicator L4; wherein,

[0034] The forced guiding type safety relay FR has four normally open contacts and four normally closed nodes;

[0035] The first interface connection wire X1 is respectively connected to one end of the first normally open node NO1 and one end of the first normally closed node NC1 of the forced guiding type safety relay FR. The other end of the first normally open node NO1 is connected to one end of the primary coil of the first Hall current sensor H1. The other end of the first normally closed node NC1 is respectively connected to the cathode of the diode D1 and one end of the fourth normally open node NO4 of the forced guiding type safety relay FR;

[0036] The second interface connection line X2 is respectively connected to one end of the second normally open node NO2 and one end of the second normally closed node NC2 of the forced guiding type safety relay FR. The other end of the second normally closed node NC2 is connected to one end of the primary coil of the second Hall current sensor H2. The other end of the second normally open node NO2 is respectively connected to the anode of the diode D1 and one end of the third normally closed node NC3 of the forced guiding type safety relay FR;

[0037] The third interface connection line X3 is respectively connected to one end of the third normally open node NO3 and one end of the fourth normally closed node NC4 of the forced guiding type safety relay FR. The other end of the third normally open node NO3 is connected to one end of the fourth normally open node NO4 of the forced guiding type safety relay FR; The other end of the fourth normally closed node NC4 is connected to one end of the third normally closed node NC3 of the forced guiding type safety relay FR;

[0038] The fourth interface connection line X4 is respectively connected to one end of the first resistor R1 and one end of the second resistor R2. The other end of the first resistor R1 is connected to the other end of the primary coil of the first Hall current sensor H1. The other end of the second resistor R2 is connected to the other end of the primary coil of the second Hall current sensor H2;

[0039] The secondary coils of the first Hall current sensor H1 and the second Hall current sensor H2 control the forced guiding type safety relay FR to act and light up the positioning drive indicator light L1, reverse drive indicator light L2, positioning indication indicator light L3 and reverse indication indicator light L4 through the indicator light control circuit 200. The positioning drive indicator light L1, reverse drive indicator light L2, positioning indication indicator light L3 and reverse indication indicator light L4 all adopt LED lights.

[0040] The indicator light control circuit 200 (see Figure 3 ) includes a first field effect transistor M0S1, a second field effect transistor MOS2 and a magnetic latching relay MR; Among them, both the first field effect transistor M0S1 and the second field effect transistor MOS2 adopt N-type field effect transistors; The magnetic latching relay MR has a dual coil;

[0041] The signal output end of the first Hall current sensor H1 is connected to the gate of the first field effect MOS1 transistor. The drain of the first field effect transistor MOS1 is connected to the cathode of the positioning drive indicator light L1 and one end of the first coil J1 of the magnetic latching relay MR. The other end of the first coil J1 is connected to the digital power supply VCC. A third resistor R3 and a first capacitor C1 are connected in parallel between the gate and the source of the first field effect transistor MOS1; The anode of the positioning drive indicator light L1 is connected to the digital power supply VCC through a fifth resistor R5;

[0042] The signal output terminal of the second Hall current sensor H2 is connected to the gate of the second metal-oxide-semiconductor field-effect transistor MOS2. The drain of the second metal-oxide-semiconductor field-effect transistor MOS2 is connected to the cathode of the reverse-position drive indicator light L2 and one end of the second coil J2 of the magnetic latching relay MR. The other end of the second coil J2 is connected to the digital power supply VCC. A fourth resistor R4 and a second capacitor C2 are connected in parallel between the gate and the source of the second metal-oxide-semiconductor field-effect transistor MOS. The anode of the reverse-position drive indicator light L2 is connected to the digital power supply VCC through a sixth resistor R6;

[0043] One end 12 of the first stationary contact of the magnetic latching relay MR is connected to the anode of the positioning indication indicator light L3. One end 14 of the second stationary contact of the magnetic latching relay MR is connected to the anode of the reverse-position indication indicator light L4. One end 11 of the moving contact of the magnetic latching relay MR is connected to the digital power supply VCC through a seventh resistor R7. The other end 21 of the moving contact is connected to one end of the coil J of the forced-guide type safety relay FR. The other end of the coil J of the forced-guide type safety relay FR is connected to the digital power supply VCC.

[0044] The electronic analog device for a four-wire DC switch machine according to the present invention, wherein the first interface connection line X1, the second interface connection line X2, the third interface connection line X3, and the fourth interface connection line X4 are used to connect the control circuit of the four-wire DC switch machine; the first resistor R1 and the second resistor R2 are used to simulate the impedance of the internal motor winding of the four-wire DC switch machine; the diode D1 is used to form an indication loop; the forced-guide type safety relay FR is used to simulate the switch in the switch machine; the magnetic latching relay MR is used to control the coil of the forced-guide type safety relay FR, so as to control the opening and closing of the normally open node and the normally closed node of the forced-guide type safety relay FR to move back and forth and maintain the current state; the positioning drive indicator light L1, the reverse-position drive indicator light L2, the positioning indication indicator light L3, and the reverse-position indication indicator light L4 respectively represent the four states of the switch machine; the primary coils of the first Hall current sensor H1 and the second Hall current sensor H2 are connected in series in the main circuit to sense the loop current, and the secondary coils of the first Hall current sensor H1 and the second Hall current sensor H2 provide control signals to the indicator light control circuit to control the operation of the forced-guide type safety relay FR and light up the positioning drive indicator light L1, the reverse-position drive indicator light L2, the positioning indication indicator light L3, and the reverse-position indication indicator light L4.

[0045] The electronic simulation device for a four-wire DC switch machine of the present invention is connected to the four-wire DC switch machine control circuit 100 in the 6502 electric concentration interlocking, and is used to simulate the four working states of the 4-wire DC switch machine, namely, normal position drive, reverse position drive, normal position indication, and reverse position indication. The initial state of the electronic simulation device of the present invention for simulating the 4-wire DC switch machine is the normal position indication state, and the switching sequence of each working state is: normal position indication → reverse position drive → reverse position indication → normal position drive.

[0046] The normal position indication simulation loop generated by the electronic simulation device of the present invention is: the first interface connection wire X1 → the first normally closed node NC1 of the forced guiding type safety relay FR → the diode D1 → the third normally closed node NC3 of the forced guiding type safety relay FR → the fourth normally closed node NC4 of the forced guiding type safety relay FR → the third interface connection wire X3.

[0047] The reverse position drive simulation loop generated by the electronic simulation device of the present invention is: the second interface connection wire X2 → the second normally closed node NC2 of the forced guiding type safety relay FR → the primary coil of the second Hall current sensor H2 → the second resistor R2 → the fourth interface connection wire X4; wherein, the secondary coil of the second Hall current sensor H2 provides the induced current signal to the indicator control circuit 200, that is, drives the second field effect transistor MOS2, thereby driving the second coil J2 of the magnetic latching relay MR and lighting the reverse position drive indicator LED2 for indicating the effectiveness of the reverse position drive. At this time, one end 11 of the moving contact of the magnetic latching relay MR is closed with one end 14 of the second static contact, thereby lighting the reverse position indicator LED4; the other end 21 of the moving contact of the magnetic latching relay MR and the other end 24 of the second static contact are closed, making the coil J of the forced guiding type safety relay FR energized, so that the first normally open node NO1, the second normally open node NO3, the third normally open node NO3, and the fourth normally open NO4 of the forced guiding type safety relay FR are all closed, and the first normally closed node NC1, the second normally closed node NC2, the third normally closed node NC3, and the fourth normally closed node NC4 of the forced guiding type safety relay FR are all opened, simulating that the switch machine has rotated to the reverse position.

[0048] The reverse position indication simulation loop generated by the electronic simulation device of the present invention is: the second interface connection wire X2 → the second normally open node NO2 of the forced guiding type safety relay FR → the diode D1 → the fourth normally open node NO4 of the forced guiding type safety relay FR → the third normally open node NO3 of the forced guiding type safety relay FR → the third interface connection wire X3.

[0049] The positioning drive simulation loop generated by the electronic simulation device of the present invention is as follows: the first interface connection line X1 → the first normally open node NO1 of the forced guiding safety relay FR → the primary coil of the first Hall current sensor H1 → the first resistor R1 → the fourth interface connection line X4; wherein, the current signal sensed by the primary coil of the first Hall current sensor H1 is provided to the indicator control circuit 200, that is, to drive the first field effect transistor MOS1, thereby driving the first coil J1 of the magnetic latching relay MR and lighting the positioning drive indicator LED1 for indicating that the positioning drive is effective. At this time, one end 11 of the moving contact of the magnetic latching relay MR is closed with one end 12 of the first static contact, thereby lighting the positioning indication indicator LED1. At the same time, the other end 21 of the moving contact of the magnetic latching relay MR and the other end 24 of the second static contact are disconnected, causing the coil J of the forced guiding safety relay FR to lose power, so that the first normally open node NO1, the second normally open node NO3, the third normally open node NO3, and the fourth normally open NO4 of the forced guiding safety relay FR are all disconnected, and the first normally closed node NC1, the second normally closed node NC2, the third normally closed node NC3, and the fourth normally closed node NC4 of the forced guiding safety relay FR are all closed, simulating that the switch machine has rotated to the positioning position.

[0050] The above embodiments are only for illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can also make various transformations or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by each claim.

Claims

1. An electronic analog device for a four-wire DC switch machine, which is connected to the four-wire DC switch machine control circuit through the first interface connection wire to the fourth interface connection wire and includes a forced guiding type safety relay, a first Hall current sensor, a second Hall current sensor, a first resistor, a second resistor, a diode, a positioning drive indicator light, a reverse position drive indicator light, a positioning indication indicator light, and a reverse position indication indicator light; characterized in that, One end of the first interface connection wire is respectively connected to one end of the first normally open node and one end of the first normally closed node of the forced guiding type safety relay. The other end of the first normally open node is connected to one end of the primary coil of the first Hall current sensor. The other end of the first normally closed node is respectively connected to the cathode of the diode and one end of the fourth normally open node of the forced guiding type safety relay; One end of the second interface connection wire is respectively connected to one end of the second normally open node and one end of the second normally closed node of the forced guiding type safety relay. The other end of the second normally closed node is connected to one end of the primary coil of the second Hall current sensor. The other end of the second normally open node is respectively connected to the anode of the diode and one end of the third normally closed node of the forced guiding type safety relay; One end of the third interface connection wire is respectively connected to one end of the third normally open node and one end of the fourth normally closed node of the forced guiding type safety relay; the other end of the third normally open node is connected to the other end of the fourth normally open node of the forced guiding type safety relay; the other end of the fourth normally closed node is connected to the other end of the third normally closed node of the forced guiding type safety relay; One end of the fourth interface connection wire is respectively connected to one end of the first resistor and one end of the second resistor. The other end of the first resistor is connected to the other end of the primary coil of the first Hall current sensor. The other end of the second resistor is connected to the other end of the primary coil of the second Hall current sensor; The secondary coils of the first Hall current sensor and the second Hall current sensor control the operation of the forced guiding type safety relay through an indicator light control circuit and light up the positioning drive indicator light, the reverse position drive indicator light, the positioning indication indicator light, and the reverse position indication indicator light; The indicator light control circuit includes a first field effect transistor, a second field effect transistor, and a magnetic latching relay; the signal output terminal of the first Hall current sensor is connected to the gate of the first field effect transistor, the drain of this first field effect transistor is connected to the cathode of the positioning drive indicator light and one end of the first coil of the magnetic latching relay, the other end of this first coil is connected to the digital power supply, and a third resistor and a first capacitor are connected in parallel between the gate and the source of this first field effect transistor; the signal output terminal of the second Hall current sensor is connected to the gate of the second field effect transistor, the drain of this second field effect transistor is connected to the cathode of the reverse position drive indicator light and one end of the second coil of the magnetic latching relay, the other end of this second coil is connected to the digital power supply, and a fourth resistor and a second capacitor are connected in parallel between the gate and the source of this second field effect transistor; the anode of the positioning drive indicator light is connected to the digital power supply through a fifth resistor, and the anode of the reverse position drive indicator light is connected to the digital power supply through a sixth resistor; the first static contact of the magnetic latching relay is connected to the anode of the positioning indication indicator light, the second static contact of the magnetic latching relay is connected to the anode of the reverse position indication indicator light, one end of the moving contact of the magnetic latching relay is connected to the digital power supply through a seventh resistor, the other end of this moving contact is connected to one end of the coil of the forced guiding type safety relay, and the other end of the coil of the forced guiding type safety relay is connected to the digital power supply.

2. The electronic analog device for a four-wire DC switch machine according to claim 1, characterized in that, The positioning drive indicator light, reverse position drive indicator light, positioning indication indicator light, and reverse position indication indicator light all adopt LED lights.

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