Furnace temperature control system of standing furnace

Abstract

The utility model relates to a furnace temperature control system of a standing furnace, which comprises a temperature upper limit control circuit and a temperature lower limit control circuit, the temperature lower limit control circuit comprises a first thermocouple and a first temperature controller, the input end of the first temperature controller is connected with the first thermocouple, and the temperature upper limit control circuit comprises a second thermocouple and a second temperature controller. The input end of the second temperature controller is connected with the second thermocouple; an intermediate relay and a relay are arranged between the output ends of the first temperature controller and the second temperature controller and the driving circuit, a normally open contact 1 of the intermediate relay is connected with the output end of the first temperature controller through a normally closed contact of the relay, a normally open contact 2 of the intermediate relay is connected with the driving circuit, and the output end of the second temperature controller is connected with a coil of the relay. According to the utility model, the temperature upper limit control circuit and the temperature lower limit control circuit are respectively used for automatically controlling the ignition circuit and the gas circuit electromagnetic valve of the standing furnace, so that the temperature of the standing furnace is kept in an operation range.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum material processing, in particular to a furnace temperature control system of a static furnace. Background Art

[0002] In the process of aluminum liquid casting, the temperature of aluminum liquid is an important step to ensure the hydrogen content of aluminum liquid and the casting quality. The current production method is artificial heating, and the main operator operates based on experience. The temperature of the gas box is heated, and constant temperature casting cannot be guaranteed. The temperature of the static furnace is easily too high, and the ingot cracks, aluminum leakage, scrapping and other quality problems occur during the casting process, and gas is wasted.

[0003] Therefore, there is an urgent need for a static furnace temperature control system to achieve automatic control of the furnace temperature. Summary of the invention

[0004] In order to solve the problem of low precision of manually controlling the temperature of a static furnace, the utility model proposes a furnace temperature control system for a static furnace, which automatically controls an ignition circuit and a gas circuit solenoid valve of the static furnace through a temperature upper limit control circuit and a temperature lower limit control circuit respectively, so that the temperature of the static furnace is maintained in an operating range.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a furnace temperature control system for a static furnace, including a static furnace ignition circuit and a gas circuit solenoid valve, and also including a temperature upper limit control circuit and a temperature lower limit control circuit, wherein the temperature upper limit control circuit and the temperature lower limit control circuit are respectively connected to a drive circuit, and the drive circuit is connected to the static furnace ignition circuit and the gas circuit solenoid valve;

[0006] The lower temperature limit control circuit comprises a first thermocouple and a first thermostat, the input end of the first thermostat is connected to the first thermocouple, and the upper temperature limit control circuit comprises a second thermocouple and a second thermostat, the input end of the second thermostat is connected to the second thermocouple;

[0007] An intermediate relay and a relay are arranged between the output ends of the first thermostat and the second thermostat and the drive circuit. The normally open contact 1 of the intermediate relay and the output end of the first thermostat are connected through the normally closed contact of the relay, the normally open contact 2 of the intermediate relay is connected to the drive circuit, and the output end of the second thermostat is connected to the coil of the relay.

[0008] The first thermostat is used to set the lower temperature limit, and the second thermostat is used to set the upper temperature limit. During operation, the temperature in the static furnace is detected by the thermocouple. When the temperature reaches the lower limit, the intermediate relay energizes the drive circuit, and then the static furnace ignition circuit and gas circuit solenoid valve are energized, and the temperature in the static furnace increases. When the temperature reaches the upper limit, the relay de-energizes the intermediate relay, and then the static furnace ignition circuit and gas circuit solenoid valve are de-energized, and the temperature in the static furnace decreases. This realizes automatic control of the temperature in the static furnace.

[0009] Furthermore, the driving circuit includes a solid-state relay, an input end of the solid-state relay is connected to a normally closed contact of the relay, and an output end of the solid-state relay is connected to an ignition circuit of the static furnace and a gas circuit solenoid valve.

[0010] Furthermore, the static furnace ignition circuit includes a heating wire ignition circuit, and the coil of the gas circuit solenoid valve and the input end of the heating wire ignition circuit are connected in series and then connected to the output end of the solid-state relay.

[0011] Furthermore, the first thermostat and the second thermostat are connected in parallel, and a circuit breaker and a boat-type switch are provided between the first thermostat, the second thermostat and the power supply.

[0012] The circuit structure is simple, no program setting is required and the operation is simple.

[0013] Furthermore, the first thermocouple and the second thermocouple are sealedly connected to the static furnace through a pipeline, and the probes of the first thermocouple and the second thermocouple are arranged inside the static furnace. The first thermocouple and the second thermocouple are both used to detect the furnace temperature of the static furnace.

[0014] Through the above technical solution, the beneficial effects of the utility model are:

[0015] The utility model realizes automatic temperature control in a static furnace so that the temperature in the static furnace is maintained in an operating range. The lower temperature limit control circuit includes a first thermocouple and a first thermostat, the input end of the first thermostat is connected to the first thermocouple, and the upper temperature limit control circuit includes a second thermocouple and a second thermostat, the input end of the second thermostat is connected to the second thermocouple; an intermediate relay and a relay are arranged between the output ends of the first thermostat and the second thermostat and the drive circuit, the normally open contact 1 of the intermediate relay and the output end of the first thermostat are connected through the normally closed contact of the relay, the normally open contact 2 of the intermediate relay is connected to the drive circuit, and the output end of the second thermostat is connected to the coil of the relay.

[0016] The driving circuit is controlled on and off respectively by the temperature lower limit control circuit and the temperature upper limit control circuit, the intermediate relay and the relay, so that when the temperature in the static furnace is lower than the lower limit, the static furnace ignition circuit and the gas circuit solenoid valve are energized to work, and the temperature in the static furnace increases; when the temperature in the static furnace is higher than the upper limit, the static furnace ignition circuit and the gas circuit solenoid valve stop working, and the temperature in the static furnace decreases. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is an electrical schematic diagram of a furnace temperature control system of a static furnace.

[0018] Figure numbers: 1 is the static furnace ignition circuit, 2 is the gas circuit solenoid valve, 3 is the first thermocouple, 4 is the first thermostat, 5 is the second thermocouple, 6 is the second thermostat, 7 is the intermediate relay, 8 is the relay, 9 is the solid-state relay, 10 is the circuit breaker, and 11 is the boat-type switch. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0020] Example 1

[0021] like Figure 1 As shown, a furnace temperature control system of a static furnace includes a static furnace ignition circuit 1 and a gas circuit solenoid valve 2, and also includes a temperature upper limit control circuit and a temperature lower limit control circuit, wherein the temperature upper limit control circuit and the temperature lower limit control circuit are respectively connected to a drive circuit, and the drive circuit is connected to the static furnace ignition circuit 1 and the gas circuit solenoid valve 2;

[0022] The lower temperature limit control circuit comprises a first thermocouple 3 and a first thermostat 4, the input end of the first thermostat 4 is connected to the first thermocouple 3, and the upper temperature limit control circuit comprises a second thermocouple 5 and a second thermostat 6, the input end of the second thermostat 6 is connected to the second thermocouple 5;

[0023] An intermediate relay 7 and a relay 8 are arranged between the output ends of the first thermostat 4 and the second thermostat 6 and the drive circuit. The coil of the intermediate relay 7 is connected to the output end of the first thermostat 4, the normally open contact of the intermediate relay 7 is connected to the normally closed contact of the relay 8, the normally closed contact of the relay 8 is also connected to the drive circuit, and the coil of the relay 8 is connected to the second thermostat 6.

[0024] Preferably, the driving circuit includes a solid-state relay 9 , an input end of the solid-state relay 9 is connected to a normally closed contact of a relay 8 , and an output end of the solid-state relay 9 is connected to the static furnace ignition circuit 1 and the gas circuit solenoid valve 2 .

[0025] Preferably, the static furnace ignition circuit 1 includes a heating wire ignition circuit, and the coil of the gas circuit solenoid valve 2 and the input end of the heating wire ignition circuit are connected in series and then connected to the output end of the solid-state relay 9.

[0026] Preferably, the first thermostat 4 and the second thermostat 6 are connected in parallel, and a circuit breaker 10 and a rocker switch 11 are provided between the first thermostat 4, the second thermostat 6 and the power supply.

[0027] Preferably, the first thermocouple 3 and the second thermocouple 5 are sealedly connected to the static furnace through a pipeline, and the probes of the first thermocouple 3 and the second thermocouple 5 are arranged inside the static furnace. The first thermocouple 3 and the second thermocouple 5 are both used to detect the furnace temperature of the static furnace.

[0028] In this embodiment, the upper limit of the static furnace temperature is set to A, and the lower limit of the static furnace temperature is set to B. The operating temperature is X, and <X<A, the corresponding first thermostat 4 is set to ≤B, ​​the first thermostat 4 outputs an electrical signal, and the second thermostat 6 is set to ≥A, and the second thermostat 6 outputs an electrical signal. The first thermostat 4 and the second thermostat 6 use CD4523-TS thermocouple thermostats produced by Foshan Hanlong Automation Technology Co., Ltd. The solid-state relay 9 is a solid-state relay.

[0029] During operation, the first thermocouple 3 and the second thermocouple 5 simultaneously detect the temperature in the static furnace. If the temperature in the static furnace is ≤B, the first thermostat 4 sends an electrical signal to energize the coil of the intermediate relay 7, the normally open contact 1 and the normally open contact 2 of the intermediate relay 7 are closed, the intermediate relay 7 is self-locked, the solid-state relay 9 is energized, the solid-state relay 9 energizes the coil of the furnace ignition circuit 1 and the gas circuit solenoid valve 2, the valve port of the gas circuit solenoid valve 2 is opened, and at the same time, the static furnace ignition circuit 1 works to ignite the gas to increase the temperature in the static furnace. When the static furnace temperature is greater than B, the electrical signal sent by the first thermostat 4 disappears, but because the intermediate relay 7 is self-locked, the static furnace ignition circuit 1 and the gas circuit solenoid valve 2 are still working. When the static furnace temperature is ≥A, the second thermostat 6 sends an electrical signal, the relay 8 is energized, the normally closed contact of the relay 8 is disconnected, the intermediate relay 7 is reset, the solid-state relay 9 loses power, and the static furnace ignition circuit 1 and the gas circuit solenoid valve 2 stop working. The temperature in the static furnace drops. When the static furnace temperature is less than A, the signal of the second thermostat 6 disappears, and the relay 8 is reset. Until the static furnace temperature is less than or equal to B, the first thermostat 4 repeats its work.

[0030] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A temperature control system for a static furnace, comprising an ignition circuit (1) for the static furnace and a gas circuit solenoid valve (2), characterized in that: It also includes an upper temperature limit control circuit and a lower temperature limit control circuit, wherein the upper temperature limit control circuit and the lower temperature limit control circuit are respectively connected to a drive circuit, and the drive circuit is connected to the static furnace ignition circuit (1) and the gas circuit solenoid valve (2); The lower temperature limit control circuit comprises a first thermocouple (3) and a first temperature controller (4), the input end of the first temperature controller (4) being connected to the first thermocouple (3); the upper temperature limit control circuit comprises a second thermocouple (5) and a second temperature controller (6), the input end of the second temperature controller (6) being connected to the second thermocouple (5); An intermediate relay (7) and a relay (8) are provided between the output ends of the first thermostat (4) and the second thermostat (6) and the drive circuit; a normally open contact 1 of the intermediate relay (7) and the output end of the first thermostat (4) are connected via a normally closed contact of the relay (8); a normally open contact 2 of the intermediate relay (7) is connected to the drive circuit; and the output end of the second thermostat (6) is connected to the coil of the relay (8).

2. A furnace temperature control system for a static furnace according to claim 1, characterized in that: The drive circuit comprises a solid-state relay (9), the input end of the solid-state relay (9) being connected to the normally closed contact of the relay (8), and the output end of the solid-state relay (9) being connected to the static furnace ignition circuit (1) and the gas path solenoid valve (2).

3. A furnace temperature control system for a static furnace according to claim 2, characterized in that: The static furnace ignition circuit (1) comprises an electric heating wire ignition circuit, and the coil of the gas circuit solenoid valve (2) and the input end of the electric heating wire ignition circuit are connected in series and then connected to the output end of the solid-state relay (9).

4. A furnace temperature control system for a static furnace according to claim 1, characterized in that: The first thermostat (4) and the second thermostat (6) are connected in parallel, and a circuit breaker (10) and a rocker switch (11) are provided between the first thermostat (4), the second thermostat (6) and the power supply.

5. The furnace temperature control system of a static furnace according to claim 1, characterized in that: The first thermocouple (3) and the second thermocouple (5) are sealedly connected to the static furnace via a pipeline, and probes of the first thermocouple (3) and the second thermocouple (5) are arranged inside the static furnace. The first thermocouple (3) and the second thermocouple (5) are both used to detect the furnace temperature of the static furnace.

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