AC turnout control circuit

Abstract

The utility model belongs to the technical field of turnout control circuits, and discloses an alternating current turnout control circuit, which is characterized in that a guarantee relay JDBZJ is arranged between an open-phase protector DBQ and a first turnout starting relay 1DQJ, and a guarantee relay JDBZJ is arranged between the open-phase protector DBQ and the first turnout starting relay 1DQJF; an excitation circuit of the guarantee relay JDBZJ is matched and connected with a second turnout starting repeating relay 2DQJF through a positioning operation relay DCJ or an anti-position operation relay FCJ, and a self-closing circuit of the guarantee relay JDBZJ is connected through a protection relay BHJ; and an excitation circuit of the second turnout starting repeating relay 2DQJF is communicated by a polar relay 2DQJ. According to the utility model, the electrified (large-current) disconnection of the reinforced contact of the polar relay is changed into the unelectrified (large-current) disconnection when the turnout is wrenched, so that the surface of the reinforced contact is ensured not to be obviously burnt in the service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of turnout control circuits, and in particular relates to an AC turnout control circuit. Background Art

[0002] The AC turnout circuit is usually a 5-wire circuit. The turnout start circuit and the turnout indication circuit share some relay contacts and cables. The turnout start circuit is an AC 380V power supply, and the load is a three-phase motor. When the three-phase motor operates normally, the AC current is about 1.5A-2A. The turnout indication circuit is an AC 220V power supply, and the load is a diode and a DC relay. When the relay is normally sucked up, the AC current is about 0.05A. Since the indication circuit and the start circuit have a common part, when the turnout is just turned, the AC 380V power supply will pass through the turnout indication circuit and form a loop through the diode. The current of the starting circuit is more than 30 times the current of the indication circuit. The reinforced contacts of the polar relay in this circuit play the role of switching the 380V starting power supply from the diode circuit to the motor starting circuit. During the switching process, the reinforced contacts of the polar relay will be charged (large current) to disconnect the circuit through the diode, and then connect the starting circuit through the motor. When the reinforced contacts are energized (large current) and the circuit is disconnected, arcing will occur, sparks will be generated, and the contacts will burn and oxidize, which will cause the turnout to fail to switch normally or have no indication. At the same time, the design life of the reinforced contacts is relatively short and they are prone to poor contact due to burning and oxidation, leading to turnout failure. Utility Model Content

[0003] The utility model aims to solve the above technical problems at least to a certain extent. To this end, the utility model aims to provide an AC turnout control circuit.

[0004] The technical solution adopted by the utility model is:

[0005] An AC turnout control circuit comprises a phase failure protector DBQ, a first turnout start relay 1DQJ, a first turnout start repeating relay 1DQJF, a second turnout start repeating relay 2DQJF and a polarized relay 2DQJ. A protection relay JDBZJ is provided between the phase failure protector DBQ and the first turnout start repeating relay 1DQJ and between the phase failure protector DBQ and the first turnout start repeating relay 1DQJF. The excitation circuit of the protection relay JDBZJ is connected with the second turnout start repeating relay 2DQJF through a positioning operating relay DCJ or a reverse operating relay FCJ, and the self-closing circuit of the protection relay JDBZJ is connected through a protection relay BHJ; the excitation circuit of the second turnout start repeating relay 2DQJF is connected through the polarized relay 2DQJ.

[0006] Preferably, one of the protection relays JDBZJ is arranged between the phase failure protector DBQ and the 12 contacts of the first switch start relay 1DQJ; the other protection relay JDBZJ is arranged between the phase failure protector DBQ and the 12 contacts of the first switch start repeater relay 1DQJF.

[0007] Preferably, the protection relay JDBZJ is a JWJXC-480 relay, and the second turnout start repeater relay 2DQJF is a JYJXC-160 / 260 relay.

[0008] The beneficial effects of the utility model are:

[0009] The utility model provides an AC turnout control circuit, which improves the disconnection of the reinforced contacts of the polar relay from being energized (large current) to being disconnected without being energized (large current) when the turnout is turned, thereby ensuring that the surface of the reinforced contacts will not be obviously burned black during the service life, thereby achieving the purpose of prolonging the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is an existing AC turnout control circuit.

[0011] Figure 2 The utility model relates to an AC turnout control circuit.

[0012] Figure 3 The utility model relates to a logic circuit of a contact protection relay. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] It should be understood that it should also be noted that in the embodiment, the functions / actions that appear may be different from the order in which the drawings appear. For example, depending on the functions / actions involved, they can actually be executed substantially concurrently, or two figures shown in succession can sometimes be executed in the reverse order.

[0015] like Figure 1 As shown, in the existing AC turnout control circuit, due to a circuit fault, the first turnout starting relay 1DQJ is attracted, the first turnout starting repeater relay 1DQJF is attracted, and the polar relay 2DQJ cannot be reversed, the AC 380V power supply will form a loop through the diode for a long time, which will also affect the life of the diode.

[0016] like Figure 2 and Figure 3 As shown, an AC turnout control circuit of this embodiment adds a protection relay JDBZJ, a second turnout start repeater relay 2DQJF and related logic circuits on the basis of the existing AC turnout control circuit. When the polarity relay 2DQJ cannot rotate normally, the AC 380V source will not form a loop through the diode. Specifically, the AC turnout control circuit includes a phase failure protector DBQ, a first turnout starting relay 1DQJ, a first turnout starting repeating relay 1DQJF, a second turnout starting repeating relay 2DQJF and a polarized relay 2DQJ. A protection relay JDBZJ is provided between the phase failure protector DBQ and the first turnout starting relay 1DQJ and between the phase failure protector DBQ and the first turnout starting repeating relay 1DQJF. The protection relay JDBZJ is usually in a dropped state and the starting circuit is not connected. When the turnout is normally moved, the protection relay JDBZJ is attracted after the polarized relay 2DQJ completes the polarization. At this time, the AC380V starting power supply will not form a circuit through the diode before the protection relay JDBZJ is attracted, and the contacts of the polarized relay 2DQJ will not be energized and polarized, thereby achieving the purpose of protecting the strengthened contacts of the polarized relay 2DQJ.

[0017] The excitation circuit of the guarantee relay JDBZJ is connected through the positioning operating relay DCJ or the reverse operating relay FCJ and the second turnout start repeating relay 2DQJF, and the self-closing circuit of the guarantee relay JDBZJ is connected through the protection relay BHJ; the excitation circuit of the second turnout start repeating relay 2DQJF is connected by the polarized relay 2DQJ. Specifically, the front contact of the positioning operating relay DCJ or the reverse operating relay FCJ cooperates with the contact of the polarized relay 2DQJ to excite the guarantee relay JDBZJ. Taking the fixed turn and reverse position of the turnout as an example, the action sequence is: FCJ is sucked up, SJ is sucked up, 1DQJ is sucked up, 1DQJF is sucked up, 2DQJ is reversed, 2DQJF is reversed, JDBZJ is sucked up, the three-phase turnout starting circuit is connected to the motor, BHJ is sucked up, 1DQJ is closed automatically, and JDBZJ is closed automatically; when the turnout is switched to the reverse position, BHJ falls, 1DQJ falls slowly, 1DQJF falls, FBJ is sucked up; FCJ falls, and JDBZJ falls.

[0018] In the circuit of the 1-2 coil of the protection relay JDBZJ, the front contact of the protection relay BHJ ensures that the protection relay JDBZJ can remain attracted during the turnout switching process. In the circuit of the 3-4 coil of the protection relay JDBZJ, the front contact of the positioning operating relay DCJ and the upper contact of the second turnout start repeating relay 2DQJF ensure the turnout reverse operation positioning. After the polar relay 2DQJ is turned, the protection relay JDBZJ is attracted; the front contact of the reverse operating relay FCJ and the lower contact of the second turnout start repeating relay 2DQJF ensure the turnout positioning operation reverse position. After the polar relay 2DQJ is turned, the protection relay JDBZJ is attracted.

[0019] Specifically, one of the contacts of the protection relay JDBZJ is set between the phase failure protector DBQ and the 12th contact of the first switch start relay 1DQJ; the other contact of the protection relay JDBZJ is set between the phase failure protector DBQ and the 12th contact of the first switch start repeater relay 1DQJF.

[0020] In this embodiment, the safeguard relay JDBZJ adopts the JWJXC-480 relay, and the second switch start repeater relay 2DQJF adopts the JYJXC-160 / 260 relay.

[0021] Through comparative tests, the B machine of a set of double-machine turnouts is adopted Figure 2 AC turnout control circuit, A machine Figure 1 The AC turnout control circuit was operated more than 30,000 times, and the reinforced contacts of the polar relay 2DQJ of the A and B machines were compared; Figure 1 In the AC turnout control circuit, the reinforced contacts of the polarized relay 2DQJ will be disconnected due to the power (high current) during the normal operation of the turnout, resulting in large sparks. Figure 2 After installing the AC switch control circuit in the switch, the switch was operated more than 30,000 times. Figure 2 The AC turnout control circuit, the second turnout start repeater relay 2DQJF, and the reinforced contacts of the protection relay JDBZJ did not show obvious sparks, and the contacts did not show obvious arcing and burning. The expected purpose was achieved. The reinforced contacts of the protection relay JDBZJ belong to the live circuit connection, and the minimum life of the reinforced contacts is not affected.

[0022] An AC turnout control circuit of the present embodiment transfers all the energized (large current) disconnection and energized (large current) connection conditions to the contacts of the protection relay JDBZJ, and concentrates the hidden dangers that may occur in the three groups of contacts of the first turnout starting relay 1DQJ and the first turnout starting repeating relay 1DQJF on the two groups of contacts of one protection relay JDBZJ, thereby reducing the impact range by half; when the protection relay JDBZJ fails, it only affects the starting circuit and has no direct relationship with the indicating circuit, thereby reducing the turnout indicating circuit failure caused by poor contact of the first turnout starting relay 1DQJ, the first turnout starting repeating relay 1DQJF, and the polar relay 2DQJ.

[0023] The AC turnout control circuit of this embodiment also plays a certain protective role on the outdoor diode resistor. When the polar relay 2DQJ cannot be turned for some reason, the starting power supply will not be connected to form a circuit through the diode because the protection relay JDBZJ is not attracted, thereby achieving the purpose of extending the life of the diode resistor.

[0024] The present utility model is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present utility model fall within the protection scope of the present utility model.

Claims

1. An AC turnout control circuit, characterized in that: It includes a phase failure protector DBQ, a first turnout starting relay 1DQJ, a first turnout starting repeating relay 1DQJF, a second turnout starting repeating relay 2DQJF and a polarized relay 2DQJ. A protection relay JDBZJ is provided between the phase failure protector DBQ and the first turnout starting relay 1DQJ and between the phase failure protector DBQ and the first turnout starting repeating relay 1DQJF. The excitation circuit of the protection relay JDBZJ is connected with the second turnout starting repeating relay 2DQJF through the positioning operating relay DCJ or the reverse operating relay FCJ, and the self-closing circuit of the protection relay JDBZJ is connected through the protection relay BHJ; the excitation circuit of the second turnout starting repeating relay 2DQJF is connected through the polarized relay 2DQJ.

2. The AC turnout control circuit according to claim 1, characterized in that: One of the protection relays JDBZJ is arranged between the phase failure protector DBQ and the 12th contact of the first switch start relay 1DQJ; the other protection relay JDBZJ is arranged between the phase failure protector DBQ and the 12th contact of the first switch start repeater relay 1DQJF.

3. The AC turnout control circuit according to claim 1, characterized in that: The protection relay JDBZJ adopts JWJXC-480 type relay.

4. The AC turnout control circuit according to claim 1, characterized in that: The second turnout start repeater relay 2DQJF adopts JYJXC-160 / 260 type relay.

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