Control device for preventing movement overshoot of hydraulic mechanism

Abstract

The utility model discloses a control device for preventing movement overshoot of a hydraulic mechanism, relates to the field of electrical control, and solves the technical problems that an existing control electromagnetic valve device can generate a large electric arc to easily cause equipment damage and does not have an early warning function. The device comprises a controller, a first intermediate relay and a second intermediate relay, a first output end of the controller is connected with a cathode common terminal of a power supply through a coil of the first intermediate relay, and a second output end of the controller is connected with the cathode common terminal of the power supply through a coil of the second intermediate relay. On the basis of the original control of one intermediate relay, the double intermediate relays are simultaneously electrified to drive the electromagnetic valve, and the audible and visual alarm is connected, so that maintenance personnel can be reminded to replace the faulty intermediate relay in time, normal and stable work of on-site hydraulic equipment and maintenance equipment is ensured, and the maintenance efficiency is improved. And the production stability is ensured.

Description

Technical Field

[0001] The utility model relates to the field of electrical control, and more specifically, to a control device for preventing a hydraulic mechanism from overshooting. Background Art

[0002] The steel rolling production site includes many hydraulic equipment, such as the steel pusher in the heating furnace, the hydraulic motor for collecting and unloading the rolling mill, etc. In the steel rolling production, the PLC control loop is connected between the output end and the solenoid valve through an intermediate relay. The output point of the output end is connected to the (+) marked on the coil of the intermediate relay, and the (-) marked on the coil of the intermediate relay is connected to point M.

[0003] Select a set of open points on the intermediate relay, connect one end to the DC24V power supply, and the other end to the solenoid valve. Drive the intermediate relay coil through the output DO module in the PLC to energize or de-energize the control relay contacts, thereby controlling the hydraulic solenoid valve drive voltage to work. The load of the intermediate relay is the solenoid valve, which is an inductive load. When the contacts are connected and disconnected, the current change rate is high, and a short-term high voltage will be generated when the contacts are connected, thereby generating an arc. Such frequent actions will easily generate frequent arcs, causing the contacts to carbonize, resulting in poor conductivity and easy contact adhesion. Contact adhesion causes the solenoid valve to fail to be powered off in time, resulting in overshoot of the hydraulic mechanism movement. The continuous power supply of the hydraulic valve station solenoid valve causes the on-site machinery to overshoot and be damaged by force. The processing time is very long and it is easy to damage the equipment. In addition, there is no alarm output in the original electrical circuit, and it is more troublesome to find the fault. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a control device to prevent the hydraulic mechanism from overshooting in view of the deficiencies in the prior art, so as to solve the technical problems that the prior control solenoid valve device will generate a large arc that may cause damage to the equipment and has no early warning function.

[0005] The utility model discloses a control device for preventing overshoot of hydraulic mechanism movement, which comprises a controller, a first intermediate relay and a second intermediate relay, wherein the first output end of the controller is connected to the negative common terminal of the power supply through the coil of the first intermediate relay, and the second output end of the controller is connected to the negative common terminal of the power supply through the coil of the second intermediate relay;

[0006] The positive common terminal of the power supply is connected to one end of the solenoid valve through the first normally open contact of the first intermediate relay and the first normally open contact of the second intermediate relay connected in series, and the other end of the solenoid valve is connected to the negative common terminal of the power supply;

[0007] The first input end of the controller is connected to the positive common terminal of the power supply through the second normally open contact of the first intermediate relay, and the second input end of the controller is connected to the positive common terminal of the power supply through the second normally open contact of the second intermediate relay.

[0008] As a further improvement, the voltage of the positive common terminal of the power supply is +24V.

[0009] Furthermore, the voltage of the negative common terminal of the power supply is -24V.

[0010] Furthermore, the controller is a PLC.

[0011] Furthermore, the controller is electrically connected to an audible and visual alarm.

[0012] Beneficial Effects

[0013] The advantages of the utility model are:

[0014] The utility model improves the original control by one intermediate relay into control by two intermediate relays. The coils of the two intermediate relays are energized at the same time to control the normally open contacts to drive the solenoid valves. The normally open contacts of each intermediate relay are connected back to the controller. The controller is connected with an audible and visual alarm. When an intermediate relay fails, the audible and visual alarm gives an alarm, which can remind the maintenance personnel to replace it in time, thereby ensuring the normal and stable operation of the on-site hydraulic equipment and maintenance equipment and ensuring the stability of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main circuit of the utility model;

[0016] Figure 2 It is a schematic diagram of the control circuit of the utility model;

[0017] Figure 3 This is a schematic diagram of the detection circuit of the utility model.

[0018] Among them: U1-controller, KA1-first intermediate relay, KA2-second intermediate relay, KA1_1-first normally open contact of the first intermediate relay, KA1_2-second normally open contact of the first intermediate relay, KA2_1-first normally open contact of the second intermediate relay, KA2_2-second normally open contact of the second intermediate relay, XF-solenoid valve. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the embodiments, but does not constitute any limitation to the utility model. Any limited modifications made by anyone within the scope of the claims of the utility model are still within the scope of the claims of the utility model.

[0020] See also Figure 1-Figure 3 The utility model discloses a control device for preventing a hydraulic mechanism from overshooting, which comprises a controller, a first intermediate relay KA1 and a second intermediate relay KA2.

[0021] The first output end of the controller U1 is connected to the negative common terminal of the power supply through the coil of the first intermediate relay KA1, and the second output end of the controller U1 is connected to the negative common terminal of the power supply through the coil of the second intermediate relay KA2.

[0022] The positive common terminal of the power supply is connected to one end of the electromagnetic valve XF through the first normally open contact KA1_1 of the first intermediate relay and the first normally open contact KA2_1 of the second intermediate relay connected in series, and the other end of the electromagnetic valve XF is connected to the negative common terminal of the power supply.

[0023] In this embodiment, two normally open contacts of intermediate relays are connected between the output end of the controller and the electromagnetic valve XF. Each intermediate relay has two sets of normally open contacts. One contact adopts the mode of serially relaying the normally open point and the output point of the output end is connected to the coil of the intermediate relay marked with (+), and the one marked with (-) on the intermediate relay is connected to the negative common terminal of the power supply. The other normally open contact is respectively connected to the input end of the PLC. It ensures that the electromagnetic valve can accurately prevent overshoot, and the hydraulic device will not be unable to stop or the stop position is incorrect due to occasional failure of the intermediate relay contact signal, which ensures smooth production and significant effects.

[0024] The controller is electrically connected with an audible and visual alarm. When the intermediate relay fails, the audible and visual alarm will promptly alert the staff that the intermediate relay needs to be replaced in time.

[0025] The first input terminal of the controller U1 is connected to the positive common terminal of the power supply through the second normally open contact KA1_2 of the first intermediate relay, and the second input terminal of the controller U1 is connected to the positive common terminal of the power supply through the second normally open contact KA2_2 of the second intermediate relay.

[0026] When the first input terminal of the controller is connected to the positive common terminal of the power supply, and the second input terminal of the controller is connected to the positive common terminal of the power supply, the controller does not generate an early warning signal, and the two intermediate relays are normal;

[0027] When the first input terminal of the controller is disconnected from the positive common terminal of the power supply, and the second input terminal of the controller is connected to the positive common terminal of the power supply, the controller generates an early warning signal, and the controller controls the sound and light alarm to sound an alarm;

[0028] When the first input terminal of the controller is disconnected from the positive common terminal of the power supply, and the second input terminal of the controller is connected to the positive common terminal of the power supply, the controller generates an early warning signal, and the controller controls the sound and light alarm to sound an alarm;

[0029] When the first input terminal of the controller is disconnected from the positive common terminal of the power supply, and the second input terminal of the controller is disconnected from the positive common terminal of the power supply, the controller does not generate an early warning signal, and the two intermediate relays are normal.

[0030] The controller in this embodiment controls the sound and light alarm, which is a prior art and is not improved in this embodiment.

[0031] The voltage of the positive common terminal of the power supply is +24 V. The voltage of the negative common terminal of the power supply is -24 V.

[0032] The controller is a PLC. The PLC collects external signals through the IBA system. IBA stands for high-speed data acquisition system. The system can simultaneously record 1024 analog + 1024 digital channel signals within 1ms through the IBA PDA data acquisition system. It gradually expands the configuration in units of 8 channels, establishes a monitoring system and fault diagnosis functions, and collects the relevant interlocking signals into the information system for inspection and analysis.

[0033] The working principle of the utility model is: when it is necessary to control the solenoid valve XF to work, the first output terminal of the controller U1 outputs a control signal to the coil of the first intermediate relay KA1 and the coil of the second intermediate relay KA2, after the coil of the first intermediate relay KA1 and the coil of the second intermediate relay KA2 are energized, the first normally open contact KA1_1 of the first intermediate relay, the second normally open contact KA1_2 of the first intermediate relay, the first normally open contact KA2_1 of the second intermediate relay and the second normally open contact KA2_2 of the second intermediate relay are closed at the same time, and the solenoid valve XF starts to work;

[0034] At the same time, the first input terminal of the controller U1 detects the second normally open contact KA1_2 of the first intermediate relay, and the second input terminal of the controller U1 detects the second normally open contact KA2_2 of the second intermediate module, and performs the above-mentioned early warning processing on the abnormal contacts.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A control device for preventing overshoot of a hydraulic mechanism, characterized in that: It comprises a controller, a first intermediate relay (KA1) and a second intermediate relay (KA2); the first output end of the controller (U1) is connected to the negative common terminal of a power supply via the coil of the first intermediate relay (KA1); the second output end of the controller (U1) is connected to the negative common terminal of a power supply via the coil of the second intermediate relay (KA2); The positive common terminal of the power supply is connected to one end of the electromagnetic valve (XF) through the first normally open contact (KA1_1) of the first intermediate relay and the first normally open contact (KA2_1) of the second intermediate relay connected in series, and the other end of the electromagnetic valve (XF) is connected to the negative common terminal of the power supply; The first input end of the controller (U1) is connected to the positive common terminal of the power supply through the second normally open contact (KA1_2) of the first intermediate relay, and the second input end of the controller (U1) is connected to the positive common terminal of the power supply through the second normally open contact (KA2_2) of the second intermediate relay.

2. A control device for preventing overshoot of a hydraulic mechanism according to claim 1, characterized in that: The voltage of the positive common terminal of the power supply is +24V.

3. A control device for preventing overshoot of a hydraulic mechanism according to claim 1, characterized in that: The voltage of the negative common terminal of the power supply is -24V.

4. A control device for preventing overshoot of a hydraulic mechanism according to claim 1, characterized in that: The controller is a PLC.

5. A control device for preventing overshoot of a hydraulic mechanism according to claim 1, characterized in that: The controller is electrically connected to an audible and visual alarm.

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