CN217306007U - Thermal process control practical training device - Google Patents
Thermal process control practical training device Download PDFInfo
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- CN217306007U CN217306007U CN202220750664.XU CN202220750664U CN217306007U CN 217306007 U CN217306007 U CN 217306007U CN 202220750664 U CN202220750664 U CN 202220750664U CN 217306007 U CN217306007 U CN 217306007U
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- 238000004886 process control Methods 0.000 title claims abstract description 24
- 238000012549 training Methods 0.000 title claims description 28
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The utility model discloses a real device of instructing of thermal technology process control, include: the system comprises a water storage tank, a water feeding pump B, a water feeding pump A, a water feeding pump B outlet electric door, a water feeding pump A outlet electric door, a water feeding recirculation flow regulating valve, a cooling water inlet valve, an A high-level water tank water return valve, a variable-frequency drain valve A, B turbine flow transmitter, a water feeding pump outlet flow regulating valve, an A heating water tank, an A high-level water tank, an air cooling fan, an A drain pump recirculation valve, a water cooling heat exchanger and a water feeding pump B inlet manual valve; the electric control actuator comprises common thermal equipment and thermal instruments, has a universal communication interface, can be connected with various DCS and PLC control systems, and is provided with an electric control valve instrument actuating mechanism and a frequency converter and other electric dragging actuators. In addition to being able to change the set point of the regulator as a step disturbance, various disturbances can be created by solenoid valves and manual valves. Multivariable control systems and specific process control system experiments can be performed.
Description
Technical Field
The patent of the utility model relates to a real field of instructing of thermotechnical process especially relates to a real device of instructing of thermotechnical process control.
Background
Thermal engineering is a short term for engineering thermodynamics and heat transfer science. The engineering thermodynamics mainly researches the efficiency of the thermodynamic machine and the application of energy conversion participated by the thermodynamic working medium in engineering, such as a subject of converting thermodynamic energy into mechanical energy to drive the power machine to do work and the efficiency of the power machine, and further such as a subject of converting mechanical energy into thermodynamic energy by an air conditioner, and the like, and the heat transfer science is a subject of researching heat transfer, such as heat conduction, convective heat exchange, radiant energy transfer and the like of a reactor.
In the aspect of personnel experiment and training in the thermal process, most of the personnel experiment and training in the thermal process are based on theory, and the practical opportunity is lacked, so that a device capable of meeting the requirement of the personnel experiment and training in the thermal process is urgently needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the not enough among the prior art, provide a real device of instructing of thermotechnical process control.
For solving the prior art problem, the utility model discloses a real device of instructing of thermotechnical process control, include: the system comprises a water storage tank, a water feeding pump B, a water feeding pump A, a water feeding pump B outlet electric door, a water feeding pump A outlet electric door, a water feeding recirculation flow regulating valve, a cooling water inlet valve, an A high-level water tank water return valve, a variable-frequency drain valve A, B turbine flow transmitter, a water feeding pump outlet flow regulating valve, an A heating water tank, an A high-level water tank, an air cooling fan, an A drain pump recirculation valve, a water cooling heat exchanger and a water feeding pump B inlet manual valve;
the water storage tank is connected with a flow regulating valve of a water supply pump outlet through three pipelines respectively, wherein one pipeline is provided with an inlet regulating valve of a water supply pump B, the water supply pump B and an outlet electric door of the water supply pump B; one pipeline is provided with a variable-frequency water feed pump A and an electric door at the outlet of the water feed pump A; the rest pipeline is provided with a feed water recirculation flow regulating valve; the outlet flow regulating valve of the water supply pump is connected with a heating water tank A, a heater is arranged in the heating water tank A, the heating water tank A is connected with a high-level water tank A through two pipelines, and a variable-frequency drain valve A and a water-cooling heat exchanger are arranged on one pipeline; the other pipeline is provided with a recirculation valve of a drainage pump A; a virtual simulation interface is arranged at the outlet of the water-cooling heat exchanger; the high-level water tank A is connected with the water storage tank through a pipeline, and an air cooling fan is arranged on the pipeline between the high-level water tank A and the water storage tank; the high-level water tank A is also connected with the heating water tank A through a pipeline; the water-cooled heat exchanger is also connected with a feed water recirculation flow regulating valve and a water storage tank through pipelines respectively, and a cooling water inlet valve is arranged on the pipeline between the water-cooled heat exchanger and the feed water recirculation flow regulating valve.
Further, comprising: the water heater comprises a high-level water tank B, a water-cooling heat exchanger B and a virtual interface, wherein the high-level water tank B is connected with a pipeline between the heating water tank A and the high-level water tank A sequentially through the water-cooling heat exchanger B and the virtual interface.
Furthermore, a manual valve at the inlet of the drainage pump is arranged between the heating water tank A and the variable-frequency drainage valve A.
Further, an outlet check valve is arranged between the variable frequency drain valve A and the water-cooled heat exchanger.
Furthermore, the water supply system also comprises a water supply pump B outlet pressure switch, and the water supply pump B outlet pressure switch is connected with a water supply pump B outlet electric door.
Furthermore, the water supply device also comprises a water supply pump A outlet pressure switch, and the water supply pump A outlet pressure switch is connected with the water supply pump A outlet electric door.
Further, still include A turbine flow transmitter and A pressure transmitter, A turbine flow transmitter and pressure transmitter connect A high-order water tank return water valve respectively.
Further, still include temperature transmitter, temperature transmitter connects A and heats the water tank.
Further, the temperature control device also comprises a pressure transmitter and a bimetallic thermometer, wherein the pressure transmitter and the bimetallic thermometer are respectively connected with the water-cooling heat exchanger.
Further, still include the block terminal, the block terminal is used for loading the power supply system of whole real device of instructing.
The utility model discloses beneficial effect who has:
the utility model discloses a real device of instructing of thermal technology process control has contained common thermal technology equipment and thermal technology instrument, has general communication interface, can be connected with various types of DCS and PLC control system, realizes 5 kinds of control strategies once:
(1) the adjusted parameters include flow, pressure, liquid level, temperature and other thermal parameters.
(2) The actuator is provided with an electric adjusting valve instrument actuating mechanism and an electric dragging actuator such as a frequency converter.
(3) In addition to being able to change the setting of the regulator as a step disturbance, various disturbances can be created by means of solenoid valves and manual valves.
(4) One adjusted parameter can be developed into a plurality of adjusting loops under different power sources, different actuators and different process lines, so as to be beneficial to discussion and compare the advantages and disadvantages of various adjusting schemes.
(5) Multivariable control systems and specific process control system experiments can be performed.
Drawings
FIG. 1 is a schematic view of the process flow of the present invention;
FIG. 2 is a schematic structural view of the present invention;
fig. 3 is a block diagram of a virtual-real combined thermal control simulation system according to the present invention;
fig. 4 is a virtual-real combined platform management software according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1-2, the utility model discloses a real device of instructing of thermal technology process control, include: the system comprises a water storage tank 1, a water feed pump B2, a water feed pump A3, a water feed pump B outlet electric door 4, a water feed pump A outlet electric door 5, a water feed recirculation flow regulating valve 8, a cooling water inlet valve 9, an A high-level water tank water return valve 12, a variable-frequency drain valve A13, a B turbine flow transmitter 14, a water feed pump outlet flow regulating valve 15, an A heating water tank 17, an A high-level water tank 19, an air cooling fan 20, an A drain pump recirculation valve 21, a water cooling heat exchanger 22 and a water feed pump B inlet manual valve 25;
the water storage tank 1 is used as a water source and is respectively connected with a water supply pump outlet flow regulating valve 15 through three pipelines, wherein one pipeline is provided with a water supply pump B inlet regulating valve 25, a water supply pump B2 and a water supply pump B outlet electric door 4; one of the pipelines is provided with a water feeding pump A3 and an electric door 5 at the outlet of the water feeding pump A; two water supply pipelines are formed, and frequency conversion and non-frequency conversion are selected simultaneously; a water supply recirculation flow regulating valve 8 is arranged on the rest pipeline and is used for returning the redundant water to the water storage tank 1 for circulation; the water supply pump outlet flow regulating valve 15 is connected with the A heating water tank 17 and used for regulating the water replenishing amount of the A heating water tank 17, and a heater is arranged in the A heating water tank 17 and can improve the temperature of working media in the A heating water tank 17.
The heating water tank A17 is connected with the high-level water tank A19 through two pipelines, wherein one pipeline is provided with a variable frequency drain valve A13 and a water-cooling heat exchanger 22 and is used for cooling hot water in the heating water tank A17 and then sending the cooled hot water to the high-level water tank A19; the other pipeline is provided with an A drainage pump recirculation valve 21 for returning redundant hot water to the A heating water tank 17; a virtual simulation interface is arranged at the outlet of the water-cooling heat exchanger 22 and is used for data acquisition of a thermal control simulation model; the A high-level water tank 19 is connected with the water storage tank 1 through a pipeline, and an air cooling fan 20 is arranged on the pipeline between the A high-level water tank 19 and the water storage tank 1 and used for cooling water with residual temperature and then sending the water back to the water storage tank 1; the A high-level water tank 19 is also connected with the A heating water tank 17 through a pipeline to form a water return route; the water-cooled heat exchanger 22 is also connected with the feed water recirculation flow regulating valve 8 and the water storage tank 1 through pipelines respectively, and a cooling water inlet valve 9 is arranged on the pipeline between the water-cooled heat exchanger 22 and the feed water recirculation flow regulating valve 8 and used for recycling cooling water.
As reserve high-order water tank, the utility model discloses a real device of instructing of thermal technology process control still includes: the system comprises a B high-level water tank, a water-cooling heat exchanger B and a virtual interface, wherein the B high-level water tank is connected with a pipeline between the A heating water tank 17 and the A high-level water tank 19 through the water-cooling heat exchanger B and the virtual interface in sequence.
And a manual valve at the inlet of the drainage pump is arranged between the heating water tank A17 and the variable-frequency drainage valve A13 and is used for opening and closing the drainage pipeline.
An outlet check valve is arranged between the variable frequency drain valve A13 and the water-cooled heat exchanger 22 to prevent drain water from flowing back.
The two water supply pipelines also comprise a water supply pump B outlet pressure switch 6 and a water supply pump A outlet pressure switch 7 which are used for controlling the pressure in the pipelines, the water supply pump B outlet pressure switch 6 is connected with a water supply pump B outlet electric door 4, and the water supply pump A outlet pressure switch 7 is connected with a water supply pump A outlet electric door 5.
The utility model discloses a real device of instructing of thermotechnical process control still includes A turbine flow transmitter 10 and pressure transmitter 11, and A high flush tank return water valve 12 is connected respectively to A turbine flow transmitter 10 and A pressure transmitter 11, and A turbine flow transmitter 10 is used for showing the flow speed in the pipeline, and A pressure transmitter 11 is used for showing the pressure in the pipeline.
A temperature transmitter 16 is also arranged in the heating water tank A17 and used for displaying water temperature.
The water-cooled heat exchanger 22 is also connected with a pressure transmitter 23 and a bimetallic thermometer 24, wherein the pressure transmitter 23 is used for displaying the pressure in the water-cooled heat exchanger 22, and the bimetallic thermometer 24 is used for displaying the temperature in the bimetallic thermometer 24.
The utility model discloses a real device of instructing of thermal technology process control still includes block terminal 18, and block terminal 18 is used for loading the whole power supply system of instructing the device in fact.
The utility model discloses a real device of instructing of thermotechnical process control is applied to virtual reality and combines the research of thermal control simulation system, as shown in figure 3, the data flow of system. The system software mainly comprises field production implementation database software, DCS control software, PLC control software, DCS picture display software, model library software and various communication software.
The real-time production data realizes one-way communication through the network gate, and flows to the device from the production data on site in a one-way mode, so that the real-time display and playback functions of the production data are realized, and the device can be used for site accident diagnosis and production data analysis optimization.
In the minimum DCS control system, the DPU and the DCS interface adopt bidirectional data communication, data collected by the DPU are sent to a real-time picture for display, and an operation instruction can also be sent to the DPU through the real-time picture. The simulation model software and the DPU are also in bidirectional communication, and the DPU is provided with equipment operation instructions. For example: the valve position instruction and the motor start-stop instruction are sent to the model software through an OPC (optical proximity correction) communication protocol, and the model software is used for sending the equipment state and parameters to the DPU and then displaying the equipment state and parameters after operation; valve position, motor status, and tank level, etc.
Actual devices in the field, for example: the regulating valve, the motor, the frequency converter and the like are in bidirectional communication with the DPU, receive a DPU control command through a signal line and an IO terminal and feed back the state to the DPU. The real device sends the device state to the model server through the signal line, the simulation object of the real device is synchronously built in the model server, and the state between the virtual object and the real object is synchronized, so that the coupling between the real object and the virtual system can be realized.
The device is managed using software as shown in fig. 4. In the management software, some classical control cases, all thermal power plant closed-loop objects and part of sequential control objects are realized. The user can select different sub-objects to carry out configuration of the upper computer, configuration of the control strategy and debugging according to the requirement. The device simultaneously supports different DCS and PLC systems, unified and developed data interfaces are developed, all intelligent devices meeting corresponding communication interfaces can be connected into the system, and the control systems can be mutually fused to meet the requirements of different users.
The multivariate-based interactive solid model basically comprises all the daily work of thermal control personnel of the thermal power plant. The device can realize the multifunctional operations of DCS hardware and system maintenance, DCS software configuration and debugging, control system design and optimization, on-site actual equipment adjustment and fault diagnosis and analysis and the like, and has the following specific characteristics and functions:
(1) integration of real plant and virtual thermodynamic processes
The thermal control technician may choose to use a real field device instead of a virtual device to participate in system commissioning, and if a real device is chosen, such as a regulating valve, which may participate in regulation as a device in the simulation model, such as an outlet regulating valve of a pump, any operation on the real device may also affect the model calculation, such as on-site operation. This allows the real device and the virtual model to be organically integrated.
(2) Online and interactive process modeling method
And running model management software on a modeling engineer station, selecting a model needing to be connected by a training staff on the model management software, sending an instruction to a model library by the model management software after a user selects the required model, and calling the corresponding model from the model library at the moment. Meanwhile, the system gives the configuration requirement of the system and corresponding I/O for the user to use. In the modeling process, no program language is needed, and a modeling worker only needs to select a proper module for connection to generate a complete system model. The production process model established by the module mode can be modified in an online and interactive mode.
(3) Flexible extension model library software
The model library software is an extensible library, and corresponding models can be provided for use according to the needs of users. The current model base comprises a classical control object, a whole thermal power plant closed-loop object and a part of typical sequential control objects. Through continuous supplement and expansion, control objects of other systems can be added to meet the requirements of different specialties.
(4) DCS hardware operation and system maintenance
Mainly comprises hardware operation and system maintenance, such as: installation and I/O configuration of a DCS (distributed control System); reliability inspection and replacement of DCS hardware; switching between undisturbed switching tests of redundant DPUs; forcing of a process signal; and conventional operations such as configuration loading and unloading, system backup and the like are performed to improve the maintenance skills of thermal engineering personnel.
(5) DCS software configuration and debugging
The system is used for system configuration training, a plurality of sub-models are provided on a model machine, such as operation pictures and control logic configurations of various MCS and SCS subsystems, and thermal control personnel complete all processes of operation picture configuration, logic configuration, field equipment system joint debugging and the like, so that thermal engineering personnel can be promoted to comprehensively master logic configuration and optimization through the function, and the thermal power plant closed-loop object and characteristic can be familiar and mastered.
(6) Control system design and optimization
Thermal control technicians can perform various research and design works of the control system on a simulation and practical training platform. For example: simulation research, configuration analysis, optimization of control system parameters and the like of the control system.
(7) On-site actual equipment adjustment
The device is externally hung with a plurality of field actual devices, such as an actuating mechanism, a frequency converter, various transmitters and the like, can carry out debugging and setting work of the externally hung devices, and then the actual devices are connected to a DPU (distributed processing unit) and a PLC (programmable logic controller) control cabinet through signal lines and terminal blocks. Through the training, thermal workers are skilled in the debugging and setting of relevant field equipment, system wiring and configuration, system joint debugging and other skills.
(8) Fault diagnosis and analysis
A certain fault is set in the device, and the direction and possible reasons of the fault can be indicated through the analysis and the elimination of historical data, so that the fault elimination and analysis capability of the thermal staff can be exercised. For example, some thermal signals are simulated to be interfered, and thermal staff can obtain a corresponding correct conclusion through data analysis.
(9) Thermal test
The thermal staff can carry out various thermal tests in the device, such as: the method comprises the following steps of testing an object mathematical model, performing a single closed loop system experiment, performing a cascade control system experiment, performing a three-impulse control system experiment, performing a ratio control system experiment, performing a feedforward-feedback control system experiment and the like.
The economic benefit of the multivariate interactive solid model-based scheme is mainly reflected in two aspects:
the comprehensive capacity of the workers and the technicians in the plant can be improved, the problem of thermal engineering specialty can be solved, and unnecessary cost expenditure for external engaging personnel can be reduced. Through the training based on the multivariable interactive entity model, the working experience of thermal professionals on logic configuration debugging, instrument verification, equipment maintenance and the like can be greatly improved, and all the working experiences can be independently solved by hot workers in a plant after related problems are met in the plant, so that the personnel outside the plant do not need to be hired, and the cost is reduced.
And secondly, economic income is brought through organization training. Through investigation and analysis, on the one hand, the training modes of the existing domestic power plants for the thermotechnical training are single, and effective training means are lacked, so that after the multivariable interactive solid model-based scheme put forward by a buyer, comprehensive skill improvement training can be developed for the thermotechnical major, the thermal power unit is invited to participate, and training income is generated.
Through research conclusion analysis, the scheme based on the multivariate interactive solid model is used for thermal engineering training and is completely feasible. The device realizes the virtual-real combination and the object decentralized control, and can be simultaneously used for configuration, debugging and field fault diagnosis of DCS and PLC. The system has powerful functions, is simple and easy to use, and has strong expandable functions. Has strong guiding function for the practical exercise and level promotion of the thermal professional technicians.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Also in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In addition, in the drawings of the present invention, the filling pattern is only for distinguishing the pattern layer, and is not limited to any other pattern.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A thermal process control practical training device is characterized by comprising: the system comprises a water storage tank (1), a water feed pump B (2), a water feed pump A (3), a water feed pump B outlet electric door (4), a water feed pump A outlet electric door (5), a water feed recirculation flow regulating valve (8), a cooling water inlet valve (9), an A high-level water tank water return valve (12), a variable-frequency drain valve A (13), a B turbine flow transmitter (14), a water feed pump outlet flow regulating valve (15), an A heating water tank (17), an A high-level water tank (19), an air cooling fan (20), an A drain pump recirculation valve (21), a water cooling heat exchanger (22) and a water feed pump B inlet manual valve (25);
the water storage tank (1) is respectively connected with a water supply pump outlet flow regulating valve (15) through three pipelines, wherein one pipeline is provided with a water supply pump B inlet manual valve (25), a water supply pump B (2) and a water supply pump B outlet electric door (4); one pipeline is provided with a variable frequency water feed pump A (3) and an electric door (5) at the outlet of the water feed pump A; the rest pipeline is provided with a feed water recirculation flow regulating valve (8); a flow regulating valve (15) of a water supply pump outlet is connected with a heating water tank A (17), a heater is arranged in the heating water tank A (17), the heating water tank A (17) is connected with a high-level water tank A (19) through two pipelines, and one pipeline is provided with a variable-frequency drain valve A (13) and a water-cooling heat exchanger (22); the other pipeline is provided with a recirculation valve (21) of the drainage pump A; a virtual simulation interface is arranged at the outlet of the water-cooling heat exchanger (22); the A high-level water tank (19) is connected with the water storage tank (1) through a pipeline, and an air cooling fan (20) is arranged on the pipeline between the A high-level water tank (19) and the water storage tank (1); the A high-level water tank (19) is also connected with the A heating water tank (17) through a pipeline; the water-cooling heat exchanger (22) is also respectively connected with a feed water recirculation flow regulating valve (8) and a water storage tank (1) through pipelines, and a cooling water inlet valve (9) is arranged on the pipeline between the water-cooling heat exchanger (22) and the feed water recirculation flow regulating valve (8).
2. The thermal process control practical training device according to claim 1, comprising: the system comprises a high-level water tank B, a water-cooling heat exchanger B and a virtual interface, wherein the high-level water tank B is connected with a pipeline between a heating water tank A (17) and a high-level water tank A (19) through the water-cooling heat exchanger B and the virtual interface in sequence.
3. The practical training device for thermal process control according to claim 1, wherein a manual drain pump inlet valve is arranged between the A heating water tank (17) and the variable-frequency drain valve A (13).
4. The practical training device for thermal process control according to claim 1, wherein an outlet check valve is arranged between the variable frequency drain valve A (13) and the water-cooled heat exchanger (22).
5. The practical training device for thermal process control according to claim 1, further comprising a water feed pump B outlet pressure switch (6), wherein the water feed pump B outlet pressure switch (6) is connected with a water feed pump B outlet electric door (4).
6. The practical training device for thermal process control according to claim 1, further comprising a water feed pump A outlet pressure switch (7), wherein the water feed pump A outlet pressure switch (7) is connected with a water feed pump A outlet electric door (5).
7. The practical training device for thermal process control according to claim 1, further comprising an A turbine flow transmitter (10) and an A pressure transmitter (11), wherein the A turbine flow transmitter (10) and the A pressure transmitter (11) are respectively connected with an A high-level water tank water return valve (12).
8. The practical training device for thermal process control according to claim 1, further comprising a temperature transmitter (16), wherein the temperature transmitter (16) is connected with the heating water tank A (17).
9. The practical training device for thermal process control according to claim 1, further comprising a pressure transmitter (23) and a bimetallic thermometer (24), wherein the pressure transmitter (23) and the bimetallic thermometer (24) are respectively connected with the water-cooled heat exchanger (22).
10. The thermal process control practical training device according to claim 1, further comprising a distribution box (18), wherein the distribution box (18) is used for loading a power supply system of the whole practical training device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220750664.XU CN217306007U (en) | 2022-04-02 | 2022-04-02 | Thermal process control practical training device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220750664.XU CN217306007U (en) | 2022-04-02 | 2022-04-02 | Thermal process control practical training device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217306007U true CN217306007U (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220750664.XU Expired - Fee Related CN217306007U (en) | 2022-04-02 | 2022-04-02 | Thermal process control practical training device |
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| Country | Link |
|---|---|
| CN (1) | CN217306007U (en) |
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2022
- 2022-04-02 CN CN202220750664.XU patent/CN217306007U/en not_active Expired - Fee Related
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