CN210347508U - Quick detection device of rail gas pressure welding fuel calorific value - Google Patents
Quick detection device of rail gas pressure welding fuel calorific value Download PDFInfo
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- CN210347508U CN210347508U CN201921032080.3U CN201921032080U CN210347508U CN 210347508 U CN210347508 U CN 210347508U CN 201921032080 U CN201921032080 U CN 201921032080U CN 210347508 U CN210347508 U CN 210347508U
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Abstract
The utility model discloses a steel rail gas pressure welding fuel calorific value rapid detection device, the detection device comprises a gas circuit system and a temperature monitoring system for detecting combustion calorific value, the gas circuit system comprises a gas welding torch, an oxygen adjusting button, an oxygen cylinder high-pressure gauge, an oxygen cylinder pressure reducing valve, an oxygen cylinder low-pressure gauge, an oxygen gas mass flowmeter, an oxygen gas pipe, an acetylene gas mass flowmeter, an acetylene cylinder low-pressure gauge, an acetylene cylinder pressure reducing valve, an acetylene cylinder high-pressure gauge and an acetylene cylinder, the monitoring system comprises a timer, a standard test block and a thermocouple, through a comparison test in a closed environment and a construction site environment, the specified fixed time is measured, the temperature change of the standard test block in the fixed heating time under different environments is detected, the purity condition of the gas is judged by the principle that different gases are burnt to have different heat values, and the quality of the fuel gas in the construction site environment is compared; compared with the traditional artificial experience observation, the device is more efficient and accurate, avoids human factor interference, is simple and easy to operate, can quickly and accurately detect the gas combustion heat value for the gas pressure welding construction site, and compares and evaluates whether the construction site meets the requirements of the gas.
Description
Technical Field
The utility model relates to the field of welding technology, particularly, relate to a rail gas pressure welding fuel calorific value short-term test device to welding oxygen, acetylene gas purity and combustion heat value's short-term test when building site rail gas pressure welding.
Background
With the continuous increase of railway operation mileage in China, railway transportation gradually tends to high speed and heavy load, and a seamless line has long service life and high speed stability, and is rising and developing for inevitable trend. The principle of the welding of the steel rail is that the distance between the welding surfaces is shortened to the interaction radius between atoms by applying upsetting force to the two ends of the steel rail after the end surfaces to be welded are heated to plastic deformation temperature through combustion of oxyacetylene mixed gas, recrystallization is completed, and the welding surfaces reach metal bond connection between molecules.
When the steel rail is welded by gas pressure welding, the heat value is provided by the combustion of oxygen and acetylene mixed gas, and the influence of the gas quality on the welding quality is particularly critical. Most of the possible impurities in the industrial oxygen are nitrogen, and acetylene is generated by the reaction with water and is easy to have PH3，H2S and other impurity gases, which can reduce the flame temperature during heating, not only have low heating efficiency and affect the production efficiency, but also easily react with N, P, H, S and other elements to generate inclusions, so that the welding seam becomes brittle, the comprehensive properties of the joint, such as plasticity, impact toughness, strength and the like, are greatly reduced, and the service life of the joint is shortened. Therefore, the purity of oxygen and acetylene gas must be strictly controlled during welding.
At present, when the gas pressure welding is carried out on the spot, the sources of oxygen and acetylene for welding are possibly different from the sources of gas during gas detection, and the gas purity is different. At present, most of judgment on gas purity is carried out by observing the color and the length of flame when welding and heating through welding machine operators, long-term experience accumulation of technicians is needed, and the judgment is also easily influenced by other factors such as light, weather and the like, so that the interference of human factors is serious, and uncertainty is caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a rail gas pressure welding fuel calorific value short-term test device, it can be through accurate definite oxygen and acetylene proportion, the constant flow input oxygen, the acetylene mist, oxygen to the use is examined to the gas pressure welding type, the burning calorific value of acetylene gas under the same flow and proportion is the benchmark, with the gaseous purity of different source producers during the field weld, the contrast is made to the burning calorific value, give gas purity indirectly, the quantitative evaluation result of burning calorific value, with replace traditional artificial empirical formula discrimination method, overcome the welding quality scheduling problem that the human factor influences, whether the used gas purity of spot site is qualified is judged fast.
The embodiment of the utility model is realized like this:
a steel rail gas pressure welding fuel heat value rapid detection device comprises a gas path system and a temperature monitoring system for detecting a combustion heat value, wherein the gas path system comprises a gas welding torch, an oxygen adjusting button, an oxygen gas cylinder, an oxygen cylinder high-pressure gauge, an oxygen cylinder pressure reducing valve, an oxygen cylinder low-pressure gauge, an oxygen gas mass flowmeter, an oxygen gas pipe, an acetylene gas mass flowmeter, an acetylene cylinder low-pressure gauge, an acetylene gas cylinder pressure reducing valve, an acetylene cylinder high-pressure gauge and an acetylene gas cylinder, the gas welding torch is connected with the oxygen gas cylinder and the acetylene gas cylinder through the oxygen gas pipe and the acetylene gas pipe, the gas welding torch is provided with the oxygen adjusting button at the joint of the oxygen gas pipe, the oxygen gas mass flowmeter, the oxygen cylinder pressure reducing valve, the oxygen cylinder high-pressure gauge and the oxygen cylinder low-pressure gauge are arranged in the acetylene gas pipe, acetylene high pressure gauge and acetylene low pressure gauge.
In the preferred embodiment of the present invention, the monitoring system comprises a timer, a standard block and a thermocouple, the standard block is connected to the thermocouple, the standard block is disposed at a position away from the gas welding torch, and the heating time of the standard block is measured by the timer.
The utility model discloses in the embodiment of preferred, above-mentioned oxygen cylinder relief pressure valve is adjusted the oxygen circulation size in order to reduce and steady pressure, and acetylene cylinder relief pressure valve is adjusted the acetylene circulation size in order to reduce and steady pressure, and oxygen gas mass flowmeter and acetylene gas mass flowmeter measure the size of oxygen trachea and acetylene trachea respectively.
In the preferred embodiment of the present invention, the acetylene gas is stably sprayed from the gas welding torch, and the oxygen regulating button regulates the flow of oxygen through the gas welding torch, so as to precisely regulate the ratio of oxygen to acetylene gas.
In the preferred embodiment of the present invention, after the detection device is connected, the mass flow of oxygen and acetylene is adjusted to 1: 1 by the oxygen cylinder pressure reducing valve and the acetylene cylinder pressure reducing valve, so as to keep the heating flame at the welding torch of gas welding to be neutral flame.
In the preferred embodiment of the present invention, after the flame is stabilized, the standard test block is heated by the gas welding torch, and the temperature of the standard test block is detected by the thermocouple for a fixed time.
The present invention is provided in the preferred embodiment, when the detecting device is used to detect temperature in different site environments, the distance and relative position between the gas welding torch and the standard test block remain unchanged.
The utility model has the advantages that:
the utility model provides oxygen and acetylene for gas welding torch, which are used for pressure regulation and gas stabilization through an oxygen pressure reducing valve or an acetylene pressure reducing valve, accurately regulates the proportion through an oxygen regulating valve, detects the heating heat value of a standard test block in fixed time through a contrast test of closed environment and construction site environment, and contrasts and judges the gas quality of the construction site environment; compared with the traditional manual experience observation, the device and the method are more efficient and accurate, avoid interference of human factors, are simple and easy to operate, can quickly and accurately detect the combustion heat value of the gas for the gas pressure welding construction site, and compare and evaluate whether the gas for the construction site meets the requirements or not.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope.
FIG. 1 is a schematic view of the fuel calorific value rapid detection device for steel rail gas pressure welding of the present invention;
icon: 1-standard test block; 2-a thermocouple; 3-gas welding torch; 4-oxygen adjusting knob; 5-oxygen cylinder; 6-oxygen cylinder high pressure gauge; 7-oxygen cylinder pressure reducing valve; 8-oxygen cylinder low pressure gauge; 9-oxygen gas mass flow meter; 10-oxygen gas pipe; 11-acetylene gas pipe; a 12-acetylene gas mass flow meter; 13-acetylene cylinder low pressure gauge; 14-acetylene cylinder pressure reducing valve; 15-acetylene cylinder high pressure gauge; a 16-acetylene cylinder; 17-timer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
First embodiment
Referring to fig. 1, the present embodiment provides a device for rapidly detecting a fuel calorific value of a gas pressure welding for a steel rail, wherein the detection device includes a gas path system and a temperature monitoring system for detecting a combustion calorific value, the gas path system includes a gas welding torch 3, an oxygen adjusting button 4, an oxygen cylinder 5, an oxygen cylinder high pressure gauge 6, an oxygen cylinder pressure reducing valve 7, an oxygen cylinder low pressure gauge 8, an oxygen gas mass flow meter 9, an oxygen gas pipe 10, an acetylene gas pipe 11, an acetylene gas mass flow meter 12, an acetylene cylinder low pressure gauge 13, an acetylene gas cylinder pressure reducing valve 14, an acetylene cylinder high pressure gauge 15 and an acetylene gas cylinder 16, the monitoring system includes a timer 17, a standard test block 1 and a thermocouple 2, the gas welding torch 3 connects the oxygen cylinder 5 and the acetylene gas cylinder 16 through the oxygen gas pipe 10 and the acetylene gas pipe 11, the gas welding torch 3 is provided with the oxygen adjusting button 4 at a connection of the oxygen gas pipe 10, and, Oxygen cylinder relief pressure valve 7, oxygen cylinder high-pressure gauge 6 and oxygen cylinder low-pressure gauge 8, install acetylene gas mass flowmeter 12 in acetylene trachea 11, acetylene cylinder relief pressure valve, acetylene high-pressure gauge and acetylene low-pressure gauge, the standard test block 1 that treats that connects thermocouple 2 apart from flame fixed position, timer 17 is handheld by the testing personnel, record test in-process heating standard test block 1 used time, timer 17 is used for measuring the fixed time of regulation during the use, detect different temperatures, the purity condition of gas is judged to the principle that has different calorific values through different gas burning.
The gas welding torch 3 is a welding tool in the prior art, which is also called a welding gun, and is a tool for welding or preheating ferrous metal or nonferrous metal workpieces by using oxygen and medium-low pressure acetylene as heat sources, which provides oxyacetylene flame for heating a standard test block 1, a gas welding torch 3 is provided with an oxygen adjusting button 4, the oxygen adjusting button 4 is a plug-type rod-shaped body with threads, the top end of the oxygen adjusting knob is provided with a handle which is convenient to turn, one end of the oxygen adjusting knob 4 is clamped on the gas welding torch 3 and is mutually matched with the gas welding torch 3 in a rotating way, when the oxygen adjusting knob is turned, the plug column opens or closes an oxygen channel in the gas welding torch 3, which is used for adjusting the oxygen quantity of an oxygen inlet before and after ignition, acetylene gas is stably sprayed out through a gas welding torch 3, the flow of oxygen passing through the gas welding torch 3 is adjusted by the oxygen adjusting knob 4, so that the proportion of oxygen and acetylene gas is accurately adjusted; one end of a gas welding torch 3 is used for igniting acetylene gas and faces a standard test block 1, the other end of the gas welding torch 3 is provided with two gas interfaces, one interface is connected to an acetylene gas cylinder 16 through an acetylene gas pipe 11, the other interface is connected to an oxygen gas cylinder 5 through an oxygen gas pipe 10, the connection structure of the oxygen gas pipe 10 for providing oxygen is the same as that of the acetylene gas pipe 11 for providing the acetylene gas, one end of the oxygen gas pipe 10 is connected to the oxygen gas cylinder 5, the oxygen gas cylinder 5 provides oxygen for flame combustion of the oxyacetylene, the oxygen gas pipe 10 provides a path for oxygen circulation, an oxygen cylinder high pressure gauge 6, an oxygen cylinder pressure reducing valve 7, an oxygen cylinder low pressure gauge 8 and an oxygen gas mass flow meter 9 are respectively installed on the oxygen gas pipe 10 in sequence, the oxygen cylinder high pressure gauge 6 is used for monitoring the high pressure of the oxygen cylinder, and the oxygen cylinder pressure reducing valve, the device is used for reducing the pressure of oxygen after the oxygen is discharged from the acetylene cylinder and stabilizing the oxygen, the oxygen cylinder low-pressure gauge 8 is used for monitoring the low-pressure of the oxygen cylinder, the oxygen gas mass flow meter 9 is used for monitoring and controlling the flow of the oxygen passing through, one end of the acetylene gas tube 11 is connected to the acetylene gas cylinder 16, the acetylene gas cylinder 16 provides acetylene gas to be detected, oxygen supply acetylene flame combustion is carried out, the acetylene gas tube 11 provides a path for acetylene circulation, the acetylene cylinder high-pressure gauge 15, the acetylene cylinder low-pressure gauge 13, the acetylene cylinder pressure reducing valve 14 and the acetylene gas mass flow meter 12 are respectively and sequentially arranged on the acetylene gas tube 11, the acetylene cylinder high-pressure gauge 15 is used for monitoring the high-pressure of the acetylene cylinder, the acetylene cylinder pressure reducing valve 14 is used for regulating the acetylene circulation in the acetylene gas tube 11 and is used for reducing the pressure of, the acetylene gas mass flow meter 12 is used for monitoring and controlling the flow of passing acetylene; the oxygen cylinder high pressure gauge 6, the oxygen cylinder pressure reducing valve 7, the oxygen cylinder low pressure gauge 8, the oxygen gas mass flowmeter 9, the acetylene cylinder high pressure gauge 15, the acetylene cylinder low pressure gauge 13, the acetylene cylinder pressure reducing valve 14 and the acetylene gas mass flowmeter 12 are connected with the oxygen gas pipe 10 or the acetylene gas pipe 11 in the prior art, and the process of meter connection or installation is simple.
The standard test block 1 is a pure copper block with stable density, is in a square block shape, the specific heat c of the standard test block 1 is known and is used for calculating the heat value provided by the gas to be detected within the specified heating time, the standard test block 1 has stable chemical properties under the heating condition in the air, the copper does not generate chemical reaction after heating, the error of the copper is ignored after the copper is heated, the standard test block 1 is connected with a thermocouple 2, the thermocouple 2 is a common device in the prior art and is used for monitoring the temperature-time change condition of the heated standard test block 1 in the heating process, the temperature of the standard test block 1 is read through the thermocouple 2, the temperature change of the standard test block 1 is accurately recorded, the standard test block 1 is arranged at a fixed position away from a gas welding torch 3, the fixed position is kept unchanged under the closed environment and the construction site environment, the timer 17 is used for measuring the heating time of the standard test block 1, the specified heating time was fixed at 30s, and the heating time was maintained at 30s when the closed environment and the work site environment were heated separately.
The detection method uses a detection device, and comprises the following steps:
after the detection device is installed, the gas welding torch 3 is connected with the type oxygen detecting gas bottle 5 and the type acetylene detecting gas bottle 16 by using the oxygen gas pipe 10 and the acetylene gas pipe 11, respectively installing an oxygen high-pressure gauge, an oxygen pressure reducing valve, an oxygen low-pressure gauge and an oxygen gas mass flowmeter 9, an acetylene cylinder high-pressure gauge 15, an acetylene cylinder low-pressure gauge 13, an acetylene cylinder pressure reducing valve 14 and an acetylene gas mass flowmeter 12 in an oxygen gas pipe 10 and an acetylene gas pipe 11, opening the oxygen pressure reducing valve and the acetylene pressure reducing valve, igniting after the gas passes through an oxygen regulating valve, regulating the gas flowmeter to enable the gas flowmeter to display a stable flow ratio of the two gases, heating a test block with a standard size, meanwhile, the temperature of the test block is monitored through the thermocouple 2, the initial temperature value during heating is recorded, the time for heating the test block to 30s is recorded through the timer 17, the final state temperature is detected, and the combustion heat value provided by gas in the time of 30s is calculated through a formula.
S1, detecting the combustion heat value Q of oxygen and acetylene used in the detection under the closed or relatively closed environment by using a detection device1Taking the reference value as a reference value;
S2detecting the gas combustion heat value Q of oxygen and acetylene in the construction site environment in a specified fixed time under the same conditions and parameters by using a detection device2；
S3Comparing the heat value Q of the site gas2Heat value Q of mixed type fuel gas1Evaluating the heat value and purity of the construction site gas, and judging whether the welding quality is influenced;
S4: when changing gas source, the standard test block 1 is changed from initial to T by using the site gas in the same operation mode under the condition of the same time T and unchanged experimental conditions3Is heated to a final state temperature of T4By calculating the calorific value Q3＝c×m×(T4-T3) Obtaining the heat value of the fuel gas and Q2And comparing to judge whether the purity of the fuel gas meets the welding quality requirement.
Wherein S1And S2The detecting step in (1) comprises:
a. after the detection device is connected in the construction site environment, the gas mass flow of oxygen and acetylene is respectively regulated to 1: 1 through an oxygen cylinder pressure reducing valve 7 and an acetylene cylinder pressure reducing valve 14, and the heating flame at the gas welding torch 3 is kept to be neutral flame;
b. after the flame is stabilized, the standard test block 1 is heated, and the initial temperature T is recorded by the thermocouple 20Or T1While the heating distance and position between the gas welding torch 3 and the standard block 1 are kept constant, wherein T0Is the initial temperature in a closed environment, T1Is the initial temperature in the worksite environment;
c. after the heating time T, recording the temperature value T of the standard test block 10'，T2And calculating the heat value Q provided by the fuel gas in the time t1Or Q2Wherein T is0' is the temperature after heating the standard test block 1 in a closed environment, T2For the temperature after heating the standard test block 1 in the construction site environment, wherein Q1For heating the gas heat value, Q, of the standard test block 1 in a closed environment2The heat value of the fuel gas for heating the standard test block 1 in the construction site environment.
The heat value of the gas is:
wherein c is the specific heat of the standard test block 1, the unit is J/(kg. K), m is the mass, the unit is kg, T0'、T0The final state temperature and the initial state temperature on the standard test block 1 are detected in a closed environment, and the unit is K and T2、T1The final state temperature and the initial state temperature of the standard test block 1 are detected in the construction site environment, and the unit is K.
S3Middle comparison Q1And Q2When the size of |. Q1-Q2∣/Q1And (5) less than 10%, judging that the purity of the fuel gas in the construction site environment meets the welding quality requirement.
To sum up, the utility model discloses the example provides oxygen and acetylene that the type was examined for the gas welding torch through oxygen gas cylinder and acetylene gas cylinder, stabilizes the gas through oxygen relief valve or acetylene pressure reducing valve regulated pressure, through the accurate proportion of adjusting of oxygen regulating valve, through in closed environment and building site environment contrast test, detects the heating calorific value of standard test block in the fixed time, and the contrast judgement is the gas quality of building site environment; compared with the traditional manual experience observation, the device and the method are more efficient and accurate, avoid interference of human factors, are simple and easy to operate, can quickly and accurately detect the combustion heat value of the gas for the gas pressure welding construction site, and compare and evaluate whether the gas for the construction site meets the requirements or not.
This description describes examples of embodiments of the invention, and is not intended to illustrate and describe all possible forms of the invention. It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention, and it is to be understood that the scope of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the teachings of the present invention without departing from the spirit of the invention, and such modifications and combinations are still within the scope of the invention.
Claims (7)
1. The utility model provides a rail gas pressure welding fuel calorific value short-term test device, its characterized in that, detection device include gas circuit system and the temperature monitoring system who is used for detecting the calorific value of burning, the gas circuit system includes gas welding torch, oxygen regulating button, oxygen gas cylinder, oxygen cylinder high-pressure gauge, oxygen cylinder relief pressure valve, oxygen cylinder low-pressure gauge, oxygen gas mass flowmeter, oxygen gas pipe, acetylene gas mass flowmeter, acetylene cylinder low-pressure gauge, acetylene gas cylinder relief pressure valve, acetylene gas cylinder high-pressure gauge and acetylene gas cylinder, the gas welding torch passes through oxygen gas pipe, acetylene gas pipe and connects oxygen gas cylinder and acetylene gas cylinder, the gas welding torch is equipped with the oxygen regulating button in the junction of oxygen gas pipe, install oxygen gas mass flowmeter, oxygen cylinder relief pressure valve, oxygen cylinder high-pressure gauge and acetylene gas cylinder low-pressure gauge in the oxygen gas pipe, install acetylene gas mass flowmeter, acetylene gas mass flowmeter, Acetylene cylinder pressure reducing valve, acetylene high pressure gauge and acetylene low pressure gauge.
2. A device for rapidly detecting the fuel heat value of a gas pressure welding of a steel rail as claimed in claim 1, wherein the monitoring system comprises a timer, a standard test block and a thermocouple, the standard test block is connected with the thermocouple, the standard test block is arranged at a position away from a gas welding torch, and the heating time of the standard test block is measured through the timer.
3. The device for rapidly detecting the fuel calorific value of the gas pressure welding of the steel rail as claimed in claim 2, wherein the oxygen cylinder pressure reducing valve adjusts the flow of oxygen to reduce and stabilize the pressure, the acetylene cylinder pressure reducing valve adjusts the flow of acetylene to reduce and stabilize the pressure, and the oxygen gas mass flow meter and the acetylene gas mass flow meter respectively measure the sizes of the oxygen gas pipe and the acetylene gas pipe.
4. A rapid detection device for a gas pressure welding fuel calorific value of a steel rail according to claim 2, wherein acetylene gas is stably ejected through the gas welding torch, and the flow of oxygen through the gas welding torch is adjusted by the oxygen adjusting knob, thereby accurately adjusting the ratio of oxygen and acetylene gas.
5. The device for rapidly detecting the fuel calorific value of the gas pressure welding of the steel rail according to claim 2, wherein after the detection device is connected, the mass flow of oxygen and acetylene is respectively adjusted to 1: 1 through an oxygen cylinder pressure reducing valve and an acetylene cylinder pressure reducing valve, and the heating flame at the welding torch of the gas welding is kept to be neutral flame.
6. A rapid detection device for a gas pressure welding fuel calorific value of a steel rail according to claim 5, wherein after flame is stabilized, the standard test block is heated by a gas welding torch, and the temperature of the standard test block within a fixed time is detected by a thermocouple.
7. A device for rapidly detecting the fuel calorific value of a gas pressure welding for steel rails according to claim 6, wherein when the detection device is used for detection, the distance and the relative position between the gas welding torch and the standard test block are kept unchanged when the temperature is detected under different construction site environments.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208320A (en) * | 2019-07-04 | 2019-09-06 | 成都瑞威交通科技有限公司 | A kind of gas pressure welding of rail fuel value device for fast detecting and detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208320A (en) * | 2019-07-04 | 2019-09-06 | 成都瑞威交通科技有限公司 | A kind of gas pressure welding of rail fuel value device for fast detecting and detection method |
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