Oxygen and acetylene bottle body heat tracing device for air pressure rail welding vehicle in low-temperature environment

Abstract

An oxygen and acetylene bottle body heat tracing device for an air pressure rail welding vehicle in a low-temperature environment comprises a control system, each oxygen and acetylene bottle body is provided with a heat exchange water jacket, and each heat exchange water jacket is provided with an inductive switch; an inlet of each heat exchange water jacket is communicated with a hot water distributor through a heat tracing water branch pipe of the heat exchange water jacket, each heat tracing water branch pipe is provided with an electromagnetic valve, an outlet of the water tank is communicated with the hot water distributor through a circulating pump, and an outlet of each heat exchange water jacket is communicated with an inlet of the water tank through a heat tracing water return main pipe. The water tank is filled with anti-freezing liquid and is heated by the heater; temperature sensors are arranged on the heat exchange water jacket, the water tank and in the field environment; and the temperature sensors, the inductive switch, the electromagnetic valve and the heater are electrically connected with the control system. When the external temperature is lower than 0 DEG C, the temperature of the oxygen acetylene tank is kept at about 20 DEG C during welding operation, acetylene can be fully gasified, oxygen and acetylene airflow meeting the pressure and flow requirements is provided, and the welding quality is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of heat preservation and heat exchange technology in low-temperature environments, specifically to a heat tracing device for oxygen and acetylene cylinders in low-temperature environments for a pneumatic rail welding vehicle. Background Technology

[0002] Rail welding is a crucial operational project for achieving the rapid development of seamless railway tracks and is a major component of railway track modernization. Seamless railway track rail welding primarily employs gas pressure welding.

[0003] Currently, gas pressure welding mainly uses the oxygen-acetylene heating principle, but this principle is greatly affected by changes in ambient temperature. The Qinghai-Tibet Railway traverses a high-altitude plateau climate, with most areas experiencing temperatures below 10°C year-round, and even lower temperatures at night. These low temperatures and significant temperature variations greatly impact the gas pressure welding of rails. Construction windows are primarily at night, and except for a few months and sections where the ambient temperature can be guaranteed to be above 0°C, the ambient temperature during most construction windows is below 0°C.

[0004] When the ambient temperature drops, the output pressure of oxygen cylinders decreases, and the output pressure of acetylene cylinders also decreases, sometimes even causing the valve bodies and pipelines to freeze, resulting in unstable oxygen and acetylene output pressures. This instability affects the quality of rail welding, and in severe cases, can lead to backfire, flameout, or even welding torch explosions and other incidents, posing significant safety hazards to on-site operations. Furthermore, because oxygen and acetylene are flammable and explosive gases, traditional electric heat tracing systems cannot be used. Therefore, insulation measures for oxygen and acetylene cylinders urgently need to be addressed to meet the increasing demands of construction and production, ensuring welding quality and on-site safety. Utility Model Content

[0005] This invention provides a heating device for oxygen and acetylene cylinders in low-temperature environments for a pneumatic rail welding vehicle. This device maintains the temperature of the oxygen and acetylene cylinders at around 20 degrees Celsius during welding operations in winter, allowing acetylene to fully vaporize and providing an oxygen-acetylene gas flow that meets pressure and flow requirements, thus ensuring welding quality.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A heating device for oxygen and acetylene cylinders in a low-temperature environment for a pneumatic rail welding vehicle includes a control system. Each oxygen and acetylene cylinder is equipped with a heat exchange jacket, which is fitted with an inductive switch. The inlet of each heat exchange jacket is connected to a hot water distributor via its own heat exchange branch pipe. Each heat exchange branch pipe is equipped with a solenoid valve. The outlet of the water tank is connected to the hot water distributor via a circulation pump. The outlet of each heat exchange jacket is connected to the water tank inlet via a heat exchange return main pipe. The water tank is filled with antifreeze and is heated by a heater. Temperature sensors are installed on the heat exchange jacket of each oxygen and acetylene cylinder, on the water tank, and in the surrounding environment. The temperature sensors, inductive switches, solenoid valves, and heaters are all electrically connected to the control system.

[0008] The heater is a diesel heater.

[0009] The water tank is equipped with a water level detector, which is electrically connected to the audible and visual alarm of the control system.

[0010] The control system is equipped with a touch screen.

[0011] The heater, hot water distributor, and solenoid valve are installed in a location away from the acetylene cylinder.

[0012] This invention uses a heat exchanger to continuously couple and heat the oxygen-acetylene tank. Under the precise control of a microcomputer temperature monitoring and control system, when the outside temperature is below 0°C and welding is being performed, the temperature of the oxygen-acetylene tank is maintained at around 20°C. This allows the acetylene to be fully vaporized, providing an oxygen and acetylene flow that meets the pressure and flow requirements, thus ensuring welding quality.

[0013] This invention features higher heat exchange efficiency, a compact structure, small size, and convenient maintenance; high combustion efficiency, low energy consumption, reliable performance, and rapid heating; a high-altitude compensation device to ensure normal operation at altitudes of 5000 meters and other harsh conditions; safety protection and self-diagnostic functions; and heater exhaust emissions that meet the most stringent European emission standards. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the planar structure of the thermal insulation system of this utility model;

[0015] Figure 2 This is the system control diagram of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Reference Figure 1A heating device for oxygen and acetylene cylinders in a low-temperature environment for a pneumatic rail welding vehicle includes a control system. Each oxygen and acetylene cylinder is equipped with a heat exchange jacket 6, which is equipped with an inductive switch. The inlet of each heat exchange jacket 6 is connected to a hot water distributor 3 through its respective heat exchange branch pipe 5. Each heat exchange branch pipe 5 is equipped with a solenoid valve 4. The outlet of a water tank 9 is connected to the hot water distributor 3 through a circulation pump 2. The outlet of each heat exchange jacket 6 is connected to the inlet of the water tank 9 through a heat tracing return main pipe 7. The water tank 9 is filled with antifreeze and is heated by a heater 8. Temperature sensors are installed on the heat exchange jacket of each oxygen and acetylene cylinder, on the water tank 9, and in the working environment. The temperature sensors, inductive switches, solenoid valves 4, and heaters 8 are all electrically connected to the control system.

[0018] The aforementioned control system is a microcomputer control system, in which the microcomputer controller is based on an industrial-grade embedded microcomputer, integrating a 485 communication port, optocoupler isolated input, relay output, and power supply components. The specific workflow is as follows (refer to...). Figure 2 ):

[0019] 1. By cyclically querying the temperature sensor data, the system obtains the temperature values ​​for each gas cylinder, water tank, and outdoor atmosphere. Logical operations are then used to generate alarm signals indicating the on / off state of the solenoid valves and any abnormal conditions.

[0020] 2. Scan the status of the sensor switch installed on the hot water jacket to determine whether a gas cylinder is placed at that location, which serves as a condition for starting the heating branch.

[0021] 3. Accept control commands from the touch control screen to start or stop the diesel heater; send temperature values ​​from each measuring point to the touch control screen.

[0022] 4. Monitor the water level in the tank. If it falls below the allowable level, issue an audible and visual alarm.

[0023] 5. Storage temperature setting range.

[0024] Touchscreen control panel: A human-machine interface display and control device. Its functions include displaying the values ​​of each temperature measuring point, displaying alarm items, inputting alarm limits, and starting / stopping the heater.

[0025] The heater 8 is a diesel heater. The diesel heater adopts evaporation atomization technology, which ensures stable combustion and high thermal efficiency. It can start and operate normally in ultra-low temperature environments above -41℃. It adopts automatic control and can automatically stabilize the temperature of the circulating medium between 60℃ and 80℃.

[0026] The water tank 9 is equipped with a water level detector 1, which is electrically connected to the audible and visual alarm of the control system.

[0027] The control system is equipped with a touch screen, which allows for human-computer interaction, display and control, and storage of set values.

[0028] The heater 8, hot water distributor 3, and solenoid valve 4 are installed away from the acetylene cylinder. The microcomputer controller and touch screen are installed in the driver's cab of the pneumatic rail welding vehicle to ensure safe heating of acetylene and oxygen.

[0029] To ensure that the temperature of the gas cylinders is kept within the set range, this invention uses a temperature sensor to continuously monitor the temperature of each gas cylinder. When the temperature of a gas cylinder is lower than the set range, the microcomputer controls the solenoid valve to connect the heating water circuit of that gas cylinder; conversely, when the temperature of a gas cylinder is higher than the set upper limit, the solenoid valve is turned off and heating stops.

[0030] Main technical indicators of this utility model

[0031] Each heating unit has a thermal power of 18KW and a voltage of 24V.

[0032] It can continuously maintain the oxygen and acetylene tank within a temperature range of 10℃-20℃ in an environment of -35℃.

[0033] The working process of this utility model:

[0034] The diesel heater heats the antifreeze in the water tank to 80°C and maintains it; the hot water in the tank is pressurized by the circulation pump, and then distributed to the hot water jacket by the hot water distributor and solenoid valve, which transfers the heat to the oxyacetylene cylinder to complete the heating function.

[0035] This utility model's heating system utilizes antifreeze throughout, with the hot water jacket 6 tightly fitted to the oxygen and acetylene cylinder to improve heat exchange efficiency, eliminating all electrical heating devices and ensuring safe heating of acetylene and oxygen. It also employs a microcomputer automatic control system and industrial-grade temperature sensors. By measuring the ambient temperature and the temperature of each cylinder in real time, these measured temperature parameters are logically interpreted by the software program for precise control of the water tracing system, ensuring safety and reliability, and guaranteeing maximum safety.

Claims

1. A heating device for oxygen and acetylene cylinders in a low-temperature environment for a pneumatic rail welding vehicle, comprising a control system, characterized in that, Each oxygen and acetylene cylinder is equipped with a heat exchange jacket (6), which is equipped with an induction switch. The inlet of each heat exchange jacket (6) is connected to the hot water distributor (3) through its respective hot water branch pipe (5). Each hot water branch pipe (5) is equipped with a solenoid valve (4). The outlet of the water tank (9) is connected to the hot water distributor (3) through the circulation pump (2). The outlet of each heat exchange jacket (6) is connected to the inlet of the water tank (9) through the hot water return main pipe (7). The water tank (9) is filled with antifreeze and is heated by a heater (8). Temperature sensors are installed on the heat exchange jacket (6) of each oxygen and acetylene cylinder, on the water tank (9), and in the field environment. The temperature sensors, induction switches, solenoid valves (4), and heaters (8) are all electrically connected to the control system.

2. The oxygen and acetylene cylinder heating device for a pneumatic rail welding vehicle under low-temperature conditions according to claim 1, characterized in that, The heater (8) is a diesel heater.

3. The oxygen and acetylene cylinder heating device for a pneumatic rail welding vehicle under low-temperature conditions according to claim 1, characterized in that, The water tank (9) is equipped with a water level detector (1), which is electrically connected to the audible and visual alarm of the control system.

4. The oxygen and acetylene cylinder heating device for a pneumatic rail welding vehicle under low-temperature conditions according to claim 1, characterized in that, The control system is equipped with a touch screen.

5. The oxygen and acetylene cylinder heating device for a pneumatic rail welding vehicle under low-temperature conditions according to claim 1, characterized in that, The heater (8), hot water distributor (3), and solenoid valve (4) are installed in a location away from the acetylene cylinder.

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