A gate valve opening regulation interlock system suitable for flue gas ducts of thermal oil furnaces

Abstract

This utility model discloses a gate valve opening adjustment interlock system suitable for flue gas ducts of thermal oil furnaces, belonging to the field of industrial heating equipment control technology. It includes a hoisting mechanism, a linear displacement sensor, a temperature detection device, and a PLC control system. The hoisting mechanism is connected to the gate of the gate valve and is used to adjust the gate opening. The linear displacement sensor is connected to the gate of the gate valve and is used to detect the gate opening and output an opening signal. The temperature detection device is used to detect the oil temperature in the oil outlet duct of the thermal oil furnace and output a temperature signal. The PLC control system receives the opening signal and the temperature signal, compares them with a preset standard oil temperature, and outputs a control signal to the hoisting mechanism to adjust the gate opening based on the comparison result. This utility model simplifies the mechanical structure and reduces the failure rate; it directly uses oil temperature as the control target, resulting in faster response and more precise control; and it achieves automated control through the PLC control system, improving system stability and reliability.

Description

Technical Field

[0001] This utility model belongs to the field of industrial heating equipment control technology, specifically relating to a gate valve opening adjustment interlocking system suitable for flue gas ducts of thermal oil furnaces. Background Technology

[0002] Thermal oil heaters are widely used in heating systems in industries such as chemical, textile, and building materials. Traditional oil temperature regulation typically uses a combination of mechanisms, including motors, screw conveyors, and hand-operated hoists, to control the opening of the flue gas damper, thereby regulating the amount of flue gas entering the furnace. This method is complex, has a high failure rate, and requires a large amount of maintenance. In addition, traditional regulation methods often use interlocking control between the furnace negative pressure and the damper opening, resulting in long response times, lag in regulation, and large fluctuations in oil temperature, which affects product quality. Utility Model Content

[0003] Technical problem solved: In view of the technical problems existing in the background technology, this utility model provides a gate valve opening degree adjustment interlocking system suitable for flue gas pipelines of thermal oil furnaces. The system has a simplified structure, rapid response and precise control.

[0004] Technical solution: The gate valve opening adjustment interlock system for flue gas ducts of thermal oil furnaces described in this utility model includes: A hoisting mechanism, which is connected to the gate of a gate valve and is used to adjust the opening degree of the gate; A linear displacement sensor is connected to the gate of a gate valve to detect the gate opening degree and output an opening degree signal. A temperature detection device is used to detect the oil temperature in the oil outlet pipe of the thermal oil furnace and output a temperature signal. The PLC control system receives the opening signal and temperature signal, compares them with a preset standard oil temperature, and outputs a control signal to the hoisting mechanism to adjust the gate opening based on the comparison result.

[0005] Preferably, the gate valve includes a valve frame, a gate beam is provided in the center of the valve frame, and the valve frame is divided into a gate cavity and a gate plate cavity arranged vertically by the gate beam; A gate plate is inserted into the gate beam. The gate plate moves away from or close to the gate cavity to open or close the gate valve.

[0006] Preferably, the inner walls of the side beams on both sides of the valve frame are provided with a number of guide components along both sides of the gate height. The guide components include fixing bolts fixedly connected to the side beams and guide pulleys rotatably mounted on the fixing bolts.

[0007] Preferably, a lifting link is provided through the top plate of the valve frame, and a lifting ring is provided at the top of the lifting link for the hook of the lifting mechanism to connect to; A connecting block is provided at the lower end of the hoisting connecting rod, and the connecting block is fixedly connected to the upper end of the gate plate.

[0008] Preferably, a connecting screw hole is provided at the top of the connecting block, and a through hole is provided on the top plate of the frame corresponding to the connecting screw hole; The linear displacement sensor is housed and connected to a ranging lead. A connecting screw is provided at the lower end of the ranging lead. The connecting screw passes through a through hole and is fixedly connected to the connecting screw hole. The top of the linear displacement sensor is fixed to the crossbeam of the flue workshop.

[0009] Preferably, the hoisting mechanism is installed on the workshop crossbeam at the top of the gate valve, and the hoisting mechanism is connected to a hoisting steel cable, with a hook connected to the lower end of the hoisting steel cable.

[0010] Preferably, the temperature detection device includes a thermocouple and a temperature signal converter connected to the oil outlet pipe of the oil furnace.

[0011] Compared with the prior art, the present invention has at least the following beneficial effects: This utility model includes a hoisting mechanism, a linear displacement sensor, a temperature detection device, and a PLC control system. The temperature detection device includes a thermocouple and a temperature signal converter for real-time acquisition of oil temperature signals. The linear displacement sensor is used to detect the gate opening degree. The PLC control system receives the oil temperature and gate opening degree signals, compares them with the set values, and outputs a control signal to the hoisting mechanism, thereby realizing automatic adjustment of the gate opening degree. The hoisting mechanism simplifies the mechanical structure and reduces the failure rate. Using oil temperature directly as the control target results in faster response and more precise control. The PLC control system enables automated control, improving system stability and reliability. Attached Figure Description

[0012] Figure 1 This is a first-person view structural diagram of the interlocking system of this utility model; Figure 2 This is a schematic diagram of the second-view structure of the interlocking system of this utility model; Figure 3 for Figure 2 Schematic diagram of the three-dimensional structure of the gate valve; Figure 4 This is a flowchart of the interlocking system control of this utility model.

[0013] Attached reference numerals: 1. Flue gas duct; 11. Trumpet-shaped expansion end; 2. Gate valve; 21. Valve frame; 22. Gate beam; 23. Gate cavity; 24. Gate cavity; 25. Frame top plate; 251. Through hole; 26. Guide assembly; 261. Fixing bolt; 262. Guide pulley; 27. Lifting rod; 28. Connecting block; 281. Connecting bolt hole; 29. ​​Gate; 3. Temperature detection device; 4. Lifting mechanism; 41. Hook; 5. PLC control system; 6. Communication cable; 7. Linear displacement sensor; 71. Distance measuring lead wire; 72. Connecting screw. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings. Figures 1-4 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0015] like Figures 1-2 and Figure 4 As shown, this utility model discloses a gate valve opening adjustment interlocking system suitable for flue gas ducts of thermal oil furnaces. It includes a gate valve 2, a temperature detection device 3, a hoisting mechanism 4, a PLC control system 5, and a linear displacement sensor 7. The PLC control system 5 is electrically connected to the temperature detection device 3, the linear displacement sensor 7, and the hoisting mechanism 4 via a communication cable 6. The hoisting mechanism 4 is connected to the gate of the gate valve 2 and used to adjust the gate opening. The linear displacement sensor 7 is connected to the gate of the gate valve 2 and used to detect the gate opening and output an opening signal. The temperature detection device includes a thermocouple and a temperature signal converter connected to the oil outlet pipe of the thermal oil furnace. The temperature detection device 3 is used to detect the oil temperature in the oil outlet pipe of the thermal oil furnace and output a temperature signal. The PLC control system 5 receives the opening signal and the temperature signal, compares them with a preset standard oil temperature, and outputs a control signal to the hoisting mechanism 4 based on the comparison result to adjust the gate opening. This invention employs a hoisting mechanism, which simplifies the mechanical structure and reduces the failure rate; it directly uses oil temperature as the control target, resulting in faster response and more precise control; and it achieves automated control through a PLC control system, improving system stability and reliability.

[0016] like Figure 1 and Figure 3As shown, the gate valve 2 includes a valve frame 21, with a gate beam 22 at its center. The gate beam divides the valve frame 21 into a gate cavity 23 and a gate plate cavity 24, which are positioned vertically. The two sides of the gate cavity 23 are fixedly connected to the flared expansion ends 11 of the flue gas duct 1. A gate plate 29 is inserted into the gate beam 22. The gate plate 29 moves along the gate plate cavity 24 away from or towards the gate cavity 23 to open or close the gate valve. Multiple sets of guide components 26 are respectively arranged on the inner walls of the side beams on both sides of the valve frame 21 along the height of the gate plate. The guide components 26 include fixing bolts 261 fixedly connected to the side beams and guide pulleys 262 rotatably mounted on the fixing bolts. The gate plate 29 is slidably supported between the guide pulleys 262 to form a fixed support.

[0017] In one specific embodiment, such as Figure 3 As shown, a lifting rod 27 is installed through the top plate 25 of the valve frame 21, and a lifting ring for the lifting hook 41 of the lifting mechanism is provided at the top of the lifting rod 27; a connecting block 28 is provided at the lower end of the lifting rod 27, and the connecting block 28 is fixedly connected to the upper end of the gate plate 29. A connecting screw hole 281 is provided at the top of the connecting block 28, and a through hole 251 is provided on the top plate 25 corresponding to the connecting screw hole 281; a linear displacement sensor 7 is housed and connected to a ranging lead 71, and a connecting screw head 72 is provided at the lower end of the ranging lead 71, which passes through the through hole 251 and is fixedly connected to the connecting screw hole 281; the top of the linear displacement sensor is fixed to the crossbeam of the flue workshop.

[0018] In one specific embodiment, the hoisting mechanism 4 is installed on the workshop crossbeam at the top of the gate valve 2, and a hoisting steel cable is connected to the hoisting mechanism 4, with a hook 41 connected to the lower end of the hoisting steel cable. The hoisting mechanism 4 can use an electric hoist or an electric pulley to achieve the hoisting function.

[0019] The temperature interlock control logic or working principle of this utility model is as follows: the oil temperature is detected in real time by a temperature detection device and transmitted to the PLC control system. The PLC control system compares the real-time oil temperature with the standard oil temperature. If the real-time oil temperature exceeds the standard range, a control signal is output to the hoisting mechanism. The hoisting mechanism adjusts the gate opening according to the control signal, thereby controlling the amount of flue gas entering the oil furnace and realizing automatic adjustment of the oil temperature.

[0020] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A gate valve opening adjustment interlock system suitable for flue gas ducts of thermal oil furnaces, characterized in that, include: The hoisting mechanism (4) is connected to the gate of the gate valve (2) and is used to adjust the opening degree of the gate. Linear displacement sensor (7), which is connected to the gate of the gate valve (2) to detect the gate opening degree and output the opening degree signal; Temperature detection device (3), the temperature detection device (3) is used to detect the oil temperature in the oil outlet pipe of the thermal oil furnace and output a temperature signal; The PLC control system (5) is used to receive the opening signal and temperature signal, compare them with the preset standard oil temperature, and output a control signal to the hoisting mechanism (4) according to the comparison result to adjust the gate opening.

2. The gate valve opening adjustment interlock system for flue gas ducts of thermal oil furnaces according to claim 1, characterized in that, The gate valve (2) includes a valve frame (21), a gate beam (22) is provided in the center of the valve frame (21), and the valve frame (21) is divided into a gate cavity (23) and a gate cavity (24) arranged above and below by the gate beam. A gate plate (29) is inserted into the gate beam (22). The gate plate (29) moves away from or near the gate cavity (23) along the gate cavity (24) to realize the opening or closing of the gate valve.

3. The gate valve opening adjustment interlock system for flue gas ducts of thermal oil furnaces according to claim 2, characterized in that, The valve frame (21) has several sets of guide components (26) arranged on the inner walls of the side beams on both sides along the height of the gate. The guide components include fixing bolts (261) that are fixedly connected to the side beams and guide pulleys (262) that are rotatably mounted on the fixing bolts.

4. The gate valve opening adjustment interlock system for flue gas ducts of thermal oil furnaces according to claim 2, characterized in that, A hoisting link (27) is provided through the top plate (25) of the frame of the valve frame (21), and a lifting ring is provided at the top of the hoisting link (27) for the hook (41) of the hoisting mechanism to connect. A connecting block (28) is provided at the lower end of the hoisting link (27), and the connecting block (28) is fixedly connected to the upper end of the gate (29).

5. The gate valve opening adjustment interlock system for flue gas ducts of thermal oil furnaces according to claim 4, characterized in that, The top of the connecting block (28) is provided with a connecting screw hole (281), and the top plate (25) of the frame is provided with a through hole (251) corresponding to the connecting screw hole (281). The linear displacement sensor (7) is housed and connected to a ranging lead (71). A connecting screw (72) is provided at the lower end of the ranging lead (71). The connecting screw (72) passes through the through hole (251) and is fixedly connected to the connecting screw hole (281). The top of the linear displacement sensor is fixed to the crossbeam of the flue workshop.

6. The gate valve opening adjustment interlock system for flue gas ducts of thermal oil furnaces according to claim 4, characterized in that, The hoisting mechanism (4) is installed on the workshop crossbeam at the top of the gate valve (2), and the hoisting mechanism (4) houses and connects a hoisting steel cable, the lower end of which is connected to a hook (41).

7. The gate valve opening adjustment interlock system for flue gas ducts of thermal oil furnaces according to claim 1, characterized in that, The temperature detection device includes a thermocouple and a temperature signal converter that are connected to the oil outlet pipe of the oil furnace.

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