CN212286227U - Gas flow control device - Google Patents
Gas flow control device Download PDFInfo
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- CN212286227U CN212286227U CN202020064116.2U CN202020064116U CN212286227U CN 212286227 U CN212286227 U CN 212286227U CN 202020064116 U CN202020064116 U CN 202020064116U CN 212286227 U CN212286227 U CN 212286227U
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Abstract
The utility model discloses a gas flow control device, including centralized control unit, welding current detecting element and gas circuit execution unit, the gas circuit execution unit includes that the air inlet connects, the gas outlet connects, pressure regulating valve, flow control valve and be used for detecting the pressure switch of output gas circuit pipeline pressure, the air inlet connects and is connected with pressure regulating valve, pressure regulating valve is connected with flow control valve, the gas outlet connects and is connected with flow control valve, be equipped with communication interface on the flow control valve, flow control valve's export and gas outlet articulate and pressure switch establish between the two, the communication interface connection on centralized control unit and the flow control valve, centralized control unit still with pressure switch signal connection, welding current detecting element includes current transformer, centralized control unit and current transformer signal connection. The utility model is used for eliminate welding air current peak value, save protective gas, control welding current and air current and the unusual alarming function of flow output.
Description
Technical Field
The utility model relates to a gas flow control's technical field, concretely relates to gas flow control device's technique.
Background
Gas flow control has important and widespread application in many areas of research and production. For example, arc welding requires the detection and control of a shielding gas during welding. In the welding process, there are the following problems:
1) the phenomenon of mismatching of welding current and protective gas flow exists, if protective gas can be output in excess under the condition of meeting welding protection, so that the protective gas is wasted.
2) When the gas circuit is opened, the air flow is instantaneously overlarge due to the pressure difference at the two ends of the switch electromagnetic valve, and the electromagnetic valve is arranged on the welding robot body, is close to the position of a welding gun, is a control switch of the gas circuit and cannot be avoided.
3) When the gas circuit has faults such as gas leakage or insufficient gas source, the welding is not stopped, and the welding quality is difficult to ensure.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a gas flow control device for eliminate the air current peak value, save the protective gas, monitor the welding current and the air current, and timely send out the malfunction alarm.
To achieve the purpose, the utility model adopts the following technical proposal:
a gas flow control device characterized by: the gas flow control device comprises a centralized control unit, a welding current detection unit and a gas path execution unit, wherein the gas path execution unit comprises a gas inlet joint, a gas outlet joint, a pressure regulating valve, a flow control valve and a pressure switch for detecting the pressure of an output gas path pipeline, the gas inlet joint is connected with the pressure regulating valve, the pressure regulating valve is connected with the flow control valve, the gas outlet joint is connected with the flow control valve, the flow control valve is provided with a communication interface, the outlet of the flow control valve is connected with the air outlet joint, the pressure switch is arranged between the air outlet joint and the outlet of the flow control valve, the centralized control unit is connected with a communication interface on the flow control valve and is also connected with a pressure switch through signals, the welding current detection unit comprises a current transformer, and the centralized control unit is in signal connection with the current transformer.
The gas circuit execution units are provided with two, three or four.
And a gas filter and a gas pressure gauge are integrated on the pressure regulating valve.
The flow control valve is fixed on the mounting seat through screws.
The centralized control unit is a computer or a PLC controller.
The flow control valve is connected with a flow display instrument, and the computer or the PLC is connected with the flow control valve through the flow display instrument.
The utility model provides a gas flow control device has following beneficial effect:
the utility model is provided with a centralized control unit such as a computer or a PLC controller, a pressure regulating valve, a flow control valve, a pressure switch and a current transformer, thus the air inlet pressure can be regulated through the pressure regulating valve and impurities can be filtered; controlling the gas flow through a flow control valve, and detecting the actual output flow; detecting the pressure of an output gas circuit pipeline through a pressure switch; and detecting the output current during welding through a current transformer.
Thus, the protective gas is saved by a centralized control unit such as a PLC controller: by checking the welding current and automatically matching the flow of the protective gas, the protective gas can not be output excessively under the condition of meeting the welding protection, so that the protective gas is saved.
Eliminating the peak value of the gas flow saves the protective gas: lead to the air current too big in the twinkling of an eye because of the pressure differential at switching solenoid valve both ends when the gas circuit is opened, the utility model discloses automatic identification intervenes control, and the gas peak is removed automatically through the case aperture of control flow control valve.
Monitoring welding current and air current to ensure normal welding: the equipment automatically matches the air flow according to the current, and if the air flow is lower than the matching value due to factors such as an air source and a pipeline, the equipment automatically outputs an abnormal signal and displays abnormal information in Chinese on a human-computer interface.
Automatically detecting whether the pipeline of the workstation is abnormal: at main gas source installation the utility model provides a gas flow control device control pipeline low reaches gas circuit if still have the air current output under the welded condition not, then regards as unusual solenoid valve inefficacy, solenoid valve trouble, pipeline gas leakage promptly.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic structural view of a gas flow control device according to the present invention;
fig. 2 is a schematic structural diagram of the gas circuit execution unit of the present invention;
FIG. 3 is a schematic view of a welding gas circuit without the use of the gas flow control device of the present invention;
FIG. 4 is a schematic view of a welding gas circuit with the gas flow control device of the present invention;
fig. 5 is an effect schematic diagram of the automatic gas flow adjustment along with the welding current when the gas flow control device of the present invention is used in the welding gas circuit.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are used only for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms will be understood by those skilled in the art according to the specific circumstances.
As shown in fig. 1 and 2, the gas flow control device of the present invention comprises a centralized control unit 1, a welding current detection unit and a gas circuit execution unit 3, wherein the centralized control unit 1 is a computer or a PLC controller, and the gas circuit execution unit 3 may be one, two, three or four. The welding current detection unit includes a current transformer 2.
The air path execution unit 3 comprises an air inlet connector 31, an air outlet connector 32, a pressure regulating valve 33, a flow control valve 34 and a pressure switch 35 for detecting the pressure of the output air path pipeline, wherein the flow control valve 34 is fixed on a mounting seat 36 through screws. The pressure control valve 33 is integrated with a gas filter 331 and a gas pressure gauge 332. Air inlet connects between 31 and the pressure regulating valve 33 through the tube coupling, pass through the tube coupling between pressure regulating valve 33 and the flow control valve 34, be equipped with communication interface 37 on flow control valve 34, flow control valve 34's export is connected with pressure switch 35, and air outlet connects 32 and is connected with pressure switch 35, centralized control unit 1 with connect through the cable between the communication interface 37 on the flow control valve 34, centralized control unit 1 still with pressure switch 35 signal connection, when flow control valve 34 is connected with the flow display appearance, computer or PLC controller pass through the flow display appearance and are connected with flow control valve. The centralized control unit is also in signal connection with the current transformer 2 through a signal cable. The air outlet connection 32 leads to the welding machine 4 through a pipeline. The computer or PLC controller may also be connected directly to the flow control valve 34 via a signal conversion card.
The pressure regulating valve 33 in the gas flow control device of the utility model is used for regulating the air inlet pressure and filtering impurities; the flow control valve 34 is used for controlling the flow of the gas and detecting the actual output flow; the pressure switch 35 is used for detecting the pressure of the output gas path pipeline; the current transformer 2 is used for detecting an output current during welding.
The utility model discloses the use and the theory of operation of gas flow control device, protective gas's flow control method in the welding equipment promptly: the flow valves described below are simply referred to as flow control valves.
The utility model discloses when gas flow control device used, pressure switch set for the benchmark pressure value.
1) When the welding machine is closed, the front air valve, namely the welding machine electromagnetic valve, is closed, the output gas quantity is 0, when the actual pressure of the output gas circuit is greater than the reference pressure of the pressure switch, the PLC controls the flow valve to be closed through the feedback of the pressure switch, and the pressure of the output gas circuit is maintained.
2) When the welding machine is started, the front air valve, namely the welding machine electromagnetic valve, is opened, the pressure of the output pipeline is released, and when the actual pressure of the output air circuit is smaller than the reference pressure of the pressure switch, the PLC controls the flow valve to be slowly opened through the feedback of the pressure switch.
3) The PLC controls the switch of the flow valve to be an analog quantity signal, and the aim of eliminating the gas peak is achieved by slowly lifting the control signal.
In the control process of the flow valve, the current transformer detects welding current in real time, and is matched with output airflow in a linear relation through parameter setting, and the larger the welding current is, the larger the output airflow is, the smaller the welding current is and the smaller the output airflow is.
The output gas flow is automatically matched according to the welding current, when the welding current is within a set range, the PLC automatically calculates the matched output gas flow in an analog quantity voltage mode, and the output gas flow is not lower than a set lower flow limit and not higher than an upper limit. When the welding current is lower than the set current lower limit, the PLC outputs the welding current with the set flow lower limit value, the requirement of the minimum gas consumption is met, and therefore the welding quality is guaranteed.
The linear relation matching of the welding current and the output airflow means that the duty ratio of the welding current and the set current value range is calculated, and the duty ratio is multiplied by the set flow range to obtain the output airflow:
output air flow rate (actual welding current/set current value range) x output air flow rate value range,
setting a current range, namely setting an upper current limit and a lower current limit; setting an upper flow limit and a lower flow limit for the output air flow range;
setting an upper current limit, a lower current limit, an upper flow limit and a lower flow limit, and setting according to user requirements.
5) In order to ensure the welding quality, the output gas flow rate can be set to an output lower limit value, and even if the welding current is lower than the set lower limit, namely lower than the set current lower limit, the output gas flow rate can be output at the set lower limit value, namely the set flow rate lower limit. Specifically, when the welding current is within the set range, namely the set current range is 150-250A, the PLC automatically calculates the matched output gas flow, namely the corresponding output gas flow is 15-25L/Min; when the welding current is higher than the set upper current limit, namely 250A, the PLC controls the output gas flow to be the set upper flow limit output, namely 25L/Min; when the welding current is lower than the set current lower limit, namely 150A, the PLC outputs 15L/Min according to the set flow lower limit value, and the requirement of the minimum gas consumption is guaranteed, so that the welding quality is guaranteed.
When the output is fixed, the lower limit value of the flow is set for output; when the gas flow control device is closed, the gas is output at the maximum flow rate of 30L/Min.
And when the welding current is output linearly, namely the welding current setting area and the output gas flow setting area are in a linear relation, the welding current is lower than the lower current limit and is output by a lower flow limit value, the smaller the average sampling value of the welding current is, the faster the detection response speed is, the larger the set value is, the more stable the detection is, but the slower the response speed is. The welding current setting area is a range between a set current upper limit and a set current lower limit; the output gas flow rate setting region is a range between a set upper flow rate limit and a set lower flow rate limit.
6) The centralized control unit adopts a mode of PLC plus a touch screen for centralized control, one centralized control unit can control the gas output of four welding devices at most, all the channels are not interfered with each other, and the welding devices can be freely matched.
The utility model discloses gas flow control device functional effect contrast:
as in fig. 3, not use in the welding gas circuit the utility model discloses gas flow control device function: when the gas valve is opened, the gas flow peak value exceeds the upper limit of the detection range, namely the upper thick solid line 5 in the figure shows the real-time gas flow, and the gas peak is generated and exceeds the upper limit of the detection range.
As shown in fig. 4, not used in the welding gas circuit the utility model discloses after the gas flow control device function: the gas peak is eliminated when the gas valve is opened. I.e. the upper thick solid line 6 in the figure shows the real-time flow of gas without a gas peak.
As fig. 5, do not use in the welding gas circuit the utility model discloses behind the gas flow control device function: line 7 is the actual welding current; line 8 is the actual output flow; the gas quantity is automatically adjusted along with the welding current.
The utility model discloses gas flow control device's alarming function: wherein the pressure detection switch is a pressure switch.
1) When the pressure of the output pipeline is released, a pressure detection switch feeds back a signal, the PLC controls the flow control valve to be opened, and the flow control valve feeds back airflow output, the welding current is not detected within 3 seconds, and the PLC system judges that the pipeline has an air leakage fault and outputs an alarm signal;
2) when the pressure of the output pipeline is released, the pressure detection switch feeds back a signal, the PLC controls the flow control valve to be opened, the flow control valve feeds back airflow output and detects welding current, the PLC system judges the error between gas flow control and feedback, and when the error is more than the lower positive and negative 3L/Min, the PLC system judges that the flow output is abnormal and outputs an alarm signal.
To sum up, the utility model discloses gas flow control device main function:
the protective gas is saved: by checking the welding current and automatically matching the flow of the protective gas, the protective gas can not be output in excess under the condition of meeting the welding protection. The effect is embodied in different output currents of the same welding workpiece.
Eliminating the peak value of the gas flow saves the protective gas: when the gas circuit is opened, the air flow is overlarge instantaneously due to the pressure difference at the two ends of the switch electromagnetic valve, the equipment automatically recognizes and intervenes in control, and the PLC analog output module controls the valve core to be opened slowly to automatically eliminate gas peaks. The effect is embodied in frequent switching of the gas path electromagnetic valve.
Monitoring welding current and air current to ensure normal welding: the equipment automatically matches the air flow according to the current, if the air flow is lower than the matching value due to factors such as an air source and a pipeline, the equipment automatically outputs an abnormal signal, and a human-computer interface displays abnormal information in Chinese.
Automatically detecting whether the pipeline of the workstation is abnormal: and installing a flow controller on the main gas source to monitor the downstream gas path of the pipeline, and outputting gas flow under the condition of no welding, wherein the gas flow is regarded as abnormal, namely failure of the electromagnetic valve, failure of the electromagnetic valve and gas leakage of the pipeline.
The utility model discloses gas flow control device principle:
the welding current is monitored to automatically match the protective gas flow.
The gas peak is automatically eliminated by controlling the opening degree of the valve core: 1) the welding is in the closed condition of original solenoid valve of welding machine and flow control valve when standby state, and the centre forms sealed pipeline and has pressure, can open the welding machine solenoid valve earlier when the welding machine starts, and at this moment gas circuit control unit's pressure sensor detects the pressure reduction, initiatively adds people's control. 2) When the flow control valve is in a closed state, one end of the flow control valve is connected with atmosphere, the other end of the flow control valve is connected with a protective gas source (the pressure of the gas source is higher than that of the atmosphere), and when the electromagnetic valve of the welding machine is opened, a gas peak can be generated (namely, the flow is instantly increased, and the set flow is recovered after a certain time). At this moment the utility model discloses a PLC analog quantity module control output 0-5V voltage control flow control valve (promote the setting value with voltage at the time of setting for, the size of voltage is directly proportional with the aperture of flow valve, voltage range 0-5V). The welding machine electromagnetic valve is available in an original gas path and is used for controlling a gas path switch, and the electromagnetic valve is arranged on the welding robot body and is close to a welding gun; the gas flow control device of the utility model is additionally arranged on the original gas path; the gas flow control device is convenient to install, does not need to carry out large engineering action, is very convenient to use, and greatly reduces the installation cost and the use cost.
The protective gas is saved; the welding gas distribution proportion is detected, and the set gas amount is ensured, so that the welding quality is ensured.
And a sensor is additionally arranged at the corresponding position of the pipeline to automatically detect whether the pipeline of the workstation is normal.
The utility model discloses gas flow control device mainly constitutes: mainly composed of three units.
Main electronic control unit is centralized control unit: specifically, for example, PLC centralized control, human-computer interface display and operation can simultaneously detect and control a plurality of air paths by one control unit. The man-machine interface mainly displays the content: and displaying each gas path and corresponding current in a graph mode, displaying the current single gas flow and the current total gas flow, and displaying abnormal information in Chinese.
Welding current detection unit: and monitoring the welding current in real time through a current transformer.
A gas path execution unit: 1) a built-in pressure sensor monitors the pressure difference of the gas circuit and actively intervenes in the work; 2) the built-in flow control valve executes gas flow control; 3) and a filtering pressure regulating valve is arranged in the air channel system.
The utility model discloses the control logic of gas flow control device is control method promptly:
1. the pressure in the tube is checked through a pressure sensor, namely a pressure switch, and control is actively added;
2. the welding current is detected by the current transformer and automatically matched with the gas flow, the gas flow is controlled by the PLC analog quantity module, and the opening of the valve body is controlled in a voltage mode to achieve the purpose of controlling the flow;
3. and (4) integrating the current and the welding current of the two points, judging the system to be abnormal and outputting an abnormal signal.
The utility model discloses gas flow control device installs: the main electric control unit is fixed and connected with a 220V power supply, the inductor part of the current transformer is connected with the welding main circuit in a buckling mode, the other end of the current transformer is connected with the main control unit for communication, and the gas circuit execution unit is connected in front of the electromagnetic valve of the protection gas circuit and is connected with the main control unit.
The flow control valve of the present invention may be a mass flow controller as described in prior art chinese patent application No. 200910262030.9. The pressure regulating valve, the pressure switch and the PLC are all products in the prior art.
The utility model provides a tube coupling all can adopt screwed joint and seal and carry out fixed connection.
It should be noted that the above embodiments are only preferred embodiments of the present invention and the technical principles applied, and any changes or substitutions which can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the protection scope of the present invention.
Claims (6)
1. A gas flow control device characterized by: the gas flow control device comprises a centralized control unit, a welding current detection unit and a gas path execution unit,
the gas path execution unit comprises a gas inlet joint, a gas outlet joint, a pressure regulating valve, a flow control valve and a pressure switch for detecting the pressure of an output gas path pipeline, the gas inlet joint is connected with the pressure regulating valve, the pressure regulating valve is connected with the flow control valve, the gas outlet joint is connected with the flow control valve, the flow control valve is provided with a communication interface, the outlet of the flow control valve is connected with the gas outlet joint, the pressure switch is arranged between the gas outlet joint and the outlet of the flow control valve,
the centralized control unit is connected with a communication interface on the flow control valve and is also connected with a pressure switch through signals,
the welding current detection unit comprises a current transformer, and the centralized control unit is in signal connection with the current transformer.
2. A gas flow control apparatus according to claim 1, wherein: the gas circuit execution units are provided with two, three or four.
3. A gas flow control apparatus according to claim 1, wherein: and a gas filter and a gas pressure gauge are integrated on the pressure regulating valve.
4. A gas flow control apparatus according to claim 1, wherein: the flow control valve is fixed on the mounting seat through screws.
5. A gas flow control apparatus according to claim 1, wherein: the centralized control unit is a computer or a PLC controller.
6. A gas flow control apparatus according to claim 5, wherein: the flow control valve is connected with a flow display instrument, and the computer or the PLC is connected with the flow control valve through the flow display instrument.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020064116.2U CN212286227U (en) | 2020-01-13 | 2020-01-13 | Gas flow control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020064116.2U CN212286227U (en) | 2020-01-13 | 2020-01-13 | Gas flow control device |
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| CN212286227U true CN212286227U (en) | 2021-01-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749771A (en) * | 2022-05-20 | 2022-07-15 | 重庆理工大学 | Method for automatically adjusting flow of arc welding shielding gas by using electromagnetic valve group |
| CN117226224A (en) * | 2023-11-16 | 2023-12-15 | 苏芯物联技术(南京)有限公司 | Welding protection air flow real-time intelligent control method |
-
2020
- 2020-01-13 CN CN202020064116.2U patent/CN212286227U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749771A (en) * | 2022-05-20 | 2022-07-15 | 重庆理工大学 | Method for automatically adjusting flow of arc welding shielding gas by using electromagnetic valve group |
| CN117226224A (en) * | 2023-11-16 | 2023-12-15 | 苏芯物联技术(南京)有限公司 | Welding protection air flow real-time intelligent control method |
| CN117226224B (en) * | 2023-11-16 | 2024-01-23 | 苏芯物联技术(南京)有限公司 | Welding protection air flow real-time intelligent control method |
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