Protection device for auxiliary ballasting intermediate relay of forming machine

Abstract

The utility model relates to the technical field of forming machine circuit protection, in particular to a protection device for an intermediate relay of an auxiliary weight of a forming machine, loads DF1 and DF2 are respectively arranged in control circuits of an ascending operation mechanism and a descending operation mechanism of the auxiliary weight of the forming machine, and intermediate relays KA1 and KA2 are arranged between the loads DF1 and DF2 and the ascending operation mechanism and between the loads DF1 and DF2 and the descending operation mechanism; and normally open contacts of the intermediate relays KA1 and KA2 are connected in parallel with a circuit protection module. The protection device is applied to the press of the carbon block forming machine, and the circuit protection module consisting of the resistor, the capacitor and the diode is connected in parallel at the normally open contact of the intermediate relay, so that the reverse voltage formed by the intermediate relay can be quickly released, and the intermediate relay can be protected.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection of a molding machine, in particular to a protection device for an auxiliary pressing intermediate relay of a molding machine. Background Art

[0002] During the carbon block molding process, the molding machine needs to apply pressure. The green material in the carbon block mold box is pressed into blocks by means of intermittent pressurization and continuous pressure application. The formed carbon blocks are also called green blocks. The intermittent pressurization is controlled by a PLC to control the auxiliary pressing intermediate relay, and the output of the intermediate relay is controlled according to a cycle of working for 3 seconds and stopping for 3 seconds. The intermediate relay then controls the solenoid valve in the hydraulic system, and then continuously pressurizes the green material in the carbon block mold box through the oil jack to work. The intermediate relay works periodically. Due to the high-intensity work of the intermediate relay, the contacts are often adhered or burned out, affecting the normal operation of the equipment. It is necessary to solve the adhesion or burnout of the contacts. Content of the Utility Model

[0003] To solve the above technical problems, the utility model provides a protection device for an auxiliary pressing intermediate relay of a molding machine. In the control circuits of the rising operation mechanism and the falling operation mechanism of the auxiliary pressing of the molding machine, load DF1 and load DF2 are respectively provided. Intermediate relays KA1 and KA2 are installed between the load DF1, DF2 and the rising operation mechanism, the falling operation mechanism.

[0004] Parallel circuit protection modules are provided at the normally open contacts of the intermediate relays KA1 and KA2.

[0005] Preferably: The operating voltage of the loads DF1 and DF2 is 24V.

[0006] Preferably: In the circuit protection module at the intermediate relay KA1, resistor R1 and capacitor C1 are connected in series to form a series circuit, and diode D1 is connected in parallel on the series circuit.

[0007] Preferably: In the circuit protection module at the intermediate relay KA2, resistor R2 and capacitor C2 are connected in series to form a series circuit, and diode D2 is connected in parallel on the series circuit.

[0008] Technical Effects and Advantages of the Utility Model

[0009] The protection device of the utility model is applied to the press of a carbon block molding machine. By connecting a circuit protection module composed of a resistor, a capacitor and a diode in parallel at the normally open point of the intermediate relay, the rapid release of the reverse voltage formed by the intermediate relay can be realized, so as to protect it. Description of the Drawings

[0010] Figure 1 It is a schematic diagram of the protection device for the auxiliary pressing intermediate relay of the molding machine provided by the embodiment of the present application. Detailed implementation manners

[0011] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. The embodiments of the present utility model are given for the purposes of illustration and description, and are not exhaustive or limit the present utility model to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present utility model, and enable those of ordinary skill in the art to understand the present utility model and thus design various embodiments with various modifications suitable for specific purposes.

[0012] Embodiment

[0013] In this embodiment, a protection device for the intermediate relay of the forming machine auxiliary pressing weight is provided. Loads DF1 and DF2 are respectively provided in the control circuits of the ascending operation mechanism and the descending operation mechanism of the forming machine auxiliary pressing weight. The working voltages of the loads DF1 and DF2 are both 24V. Intermediate relays KA1 and KA2 are installed between the loads DF1 and DF2 and the ascending operation mechanism and the descending operation mechanism to control the operation actions of the entire mechanism. The above is the prior art, and the specific circuit connection and principle will not be elaborated here;

[0014] Please refer to Figure 1 , during the use of the intermediate relays KA1 and KA2, their normally open contacts are prone to damage. The reasons are as follows:

[0015] One is that the working cycle is frequent and uninterrupted, and long-term work causes damage; the other is that the loads carried by the contacts are inductive loads DF1 and DF2. DF1 and DF2 are connected in series with KA1 / KA2. When the contacts are disconnected, a relatively large reverse voltage is generated between the contacts, and arcing occurs between the moving and static contacts of the contacts, causing the contacts to burn out or adhere;

[0016] Based on the above reasons, the following methods are adopted to solve the problem:

[0017] A circuit protection module is connected in parallel at the normally open contacts of the intermediate relays KA1 and KA2. In the circuit protection module at KA1, the resistor R1 and the capacitor C1 are connected in series to form a series circuit, and then the diode D1 is connected in parallel on the series circuit to form the entire circuit protection module;

[0018] Similarly, in the circuit protection module at KA2, the resistor R2 and the capacitor C2 are connected in series to form a series circuit, and then the diode D2 is connected in parallel on the series circuit;

[0019] The parameter values of C1 / C2 / R1 / R2 are obtained by the following method:

[0020] Measure the inductance and resistance values of DF1 and DF2 through instruments, measure the action time of the normally open contacts of KA1 and KA2 using the instrument relay protection star, calculate the peak reverse voltage of the normally open contacts, and thus calculate the parameter values of C1, C2, R1, and R2. In order to discharge the stored charge of the capacitor as soon as possible, D1, D2, R1, and R2 are added to form a charge release channel.

[0021] The working process is as follows: when the normally open point of KA1 closes, the solenoid valve is energized. After working for 3 seconds, the contact needs to disconnect. At this time, the reverse voltage accumulates charge at both ends of the capacitor C1, and the charge of the capacitor C1 is released through D1 and R1, ensuring that no high-voltage arcing occurs at the contact when the normally open point of KA1 disconnects, avoiding contact burnout, which has been effectively verified in practical applications. Similarly, the working process of KA2 is the same.

[0022] The protection device of the present utility model is applied to the press of the carbon block molding machine. By connecting a circuit protection module composed of a resistor, a capacitor, and a diode in parallel at the normally open point of the intermediate relay, it can quickly release the reverse voltage formed by the intermediate relay, thereby protecting it.

[0023] Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. All other embodiments obtained by those of ordinary skill in the art and related fields based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model. The structures, devices, and operation methods not specifically described and explained in the present utility model, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. The protection device of the intermediate relay of the auxiliary weight of the molding machine. The control circuits of the ascending and descending operating mechanisms of the auxiliary weight of the molding machine are respectively provided with loads DF1 and DF2. The intermediate relays KA1 and KA2 are installed between the loads DF1 and DF2 and the ascending and descending operating mechanisms. The device is characterized by: A circuit protection module is connected in parallel at the normally open contacts of the intermediate relays KA1 and KA2.

2. The protection device of the auxiliary pressure intermediate relay of the molding machine according to claim 1 is characterized in that: The operating voltage of the loads DF1 and DF2 is 24V.

3. The protection device of the auxiliary pressure intermediate relay of the molding machine according to claim 1 is characterized in that: In the circuit protection module at the intermediate relay KA1, a resistor R1 and a capacitor C1 are connected in series to form a series circuit, and then a diode D1 is connected in parallel to the series circuit.

4. The protection device of the auxiliary pressure intermediate relay of the molding machine according to claim 1 is characterized in that: In the circuit protection module at the intermediate relay KA2, a resistor R2 and a capacitor C2 are connected in series to form a series circuit, and a diode D2 is connected in parallel to the series circuit.

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