A digital process control demonstration experiment device

Abstract

The utility model relates to demonstration experiment device field discloses a kind of digital process control demonstration experiment device, including chassis, the upper surface of the chassis is provided with protection mechanism, the protection mechanism includes the water pump of the side fixed connection in the chassis upper surface front end, the output end of the water pump is fixedly connected with output pipe, the upper end of the outer wall of output pipe is fixedly connected with protection tee, the inside wall of the side of protection tee is fixedly connected with pressure relief pipe, the middle part of the outer wall of pressure relief pipe is provided with pressure relief valve gate.The utility model, through buffer mechanism, the water inlet pipe between small water tank and small water tank body can be kept in suspended state, completely do not weld fixed, to eliminate the stress influence brought by pipeline thermal expansion and contraction or mechanical vibration.And water outlet pipe and overflow pipe are flexibly connected by first silica gel hose and water outlet pipe, the material can guarantee sealing property, axial displacement and radial swing of pipeline can be effectively absorbed.

Description

Technical Field

[0001] This utility model relates to the field of demonstration experimental devices, and in particular to a digital process control demonstration experimental device. Background Technology

[0002] Process control devices are the core equipment of industrial automation systems. They are mainly used for real-time monitoring, precise control, and dynamic adjustment of key parameters in the production process, such as temperature, pressure, flow rate, liquid level, and pH value, thereby ensuring process stability, improving production efficiency, and product quality. They consist of sensors, PLCs, actuators such as regulating valves, frequency converters, and human-machine interfaces. They can perform complex control strategies such as single-loop control, cascade regulation, and feedforward compensation, and are widely used in process industries such as chemical, power, and pharmaceutical industries.

[0003] Traditional digital process control demonstration experimental devices may experience a sudden pressure surge in the water pump outlet pipeline due to water hammer or valve misoperation, leading to safety hazards such as pipeline rupture and seal failure. Long-term overpressure operation will accelerate water pump wear and shorten equipment life. At the same time, relying on valve throttling or frequent start-stop pressure regulation will increase energy consumption. Furthermore, the fixed connection between the water inlet pipe and the weighing box in traditional digital process control demonstration experimental devices can easily affect the accuracy of weighing.

[0004] Therefore, those skilled in the art have provided a digital process control demonstration experimental device to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a digital process control demonstration experimental device. Through a buffer mechanism, the inlet pipe of the small water tank can be kept suspended and separated from the tank body, eliminating the need for welding and thus eliminating the stress caused by thermal expansion and contraction or mechanical vibration of the pipe. The outlet pipe and overflow pipe are flexibly connected to the outlet pipe via a first silicone flexible hose. This material ensures both airtightness and effectively absorbs axial displacement and radial sway of the pipe.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A digital process control demonstration experimental device includes a base frame. A protective mechanism is provided on the upper surface of the base frame. The protective mechanism includes a water pump fixedly connected to one side of the front end of the upper surface of the base frame. An output pipe is fixedly connected to the output end of the water pump. A protective tee is fixedly connected to the upper end of the outer wall of the output pipe. A pressure relief pipe is fixedly connected to the inner wall of one side of the protective tee. A pressure relief valve is provided in the middle of the outer wall of the pressure relief pipe. A first element is fixedly connected to the input end of the water pump. A large water tank is fixedly connected to the end of the first element away from the water pump.

[0008] The four corners of the upper surface of the base frame are all fixedly connected to the frame. The middle of the inner wall of the frame is fixedly connected to the fixed plate. A buffer mechanism is provided on one side of the upper surface of the fixed plate. The buffer mechanism includes a base fixedly connected to the rear end of one side of the upper surface of the fixed plate. A weighing sensor is provided inside the base. A small water tank is fixedly connected to the upper surface of the base. A through hole is opened on one side of the upper end of the outer wall of the small water tank. A water inlet pipe is provided inside the through hole. An overflow pipe and a water outlet pipe are fixedly connected to the upper and lower ends of the outer wall of the small water tank away from the through hole, respectively. A first silicone hose is fixedly connected to the end of the overflow pipe away from the small water tank. A second silicone hose is fixedly connected to the end of the water outlet pipe away from the small water tank.

[0009] Through the above technical solution, the buffer mechanism can keep the inlet pipe of the small water tank suspended and separated from the tank body, without any welding or fixing, thereby eliminating the stress caused by thermal expansion and contraction or mechanical vibration of the pipeline. The outlet pipe and overflow pipe are flexibly connected to the outlet pipe through a first silicone hose. This material can ensure sealing and effectively absorb axial displacement and radial sway of the pipeline.

[0010] Furthermore, a first connecting pipe is fixedly connected to the upper end of the outer wall of the large water tank on the side away from the first element, a first pipe valve is fixedly connected to the middle part of the outer wall of the first connecting pipe, and a pressure gauge is fixedly connected to the end of the first connecting pipe away from the large water tank.

[0011] Through the above technical solution, the buffer mechanism can keep the inlet pipe of the small water tank suspended and separated from the tank body, without any welding or fixing, thereby eliminating the stress caused by thermal expansion and contraction or mechanical vibration of the pipeline. The outlet pipe and overflow pipe are flexibly connected to the outlet pipe through a first silicone hose. This material can ensure sealing and effectively absorb axial displacement and radial sway of the pipeline.

[0012] Furthermore, a water level gauge is fixedly connected to the front outer wall of the large water tank, and a second pipe valve is fixedly connected to the lower end of the outer wall of the large water tank on the side away from the first element. A second connecting pipe is fixedly connected to the inner wall of the second pipe valve.

[0013] The water level in the large water tank can be observed using the above technical solution and a water level gauge.

[0014] Furthermore, a main pipe is fixedly connected to the upper end of the inner wall of the protective tee, and a pressure transmitter, a regulating valve, a second pipe, a flow meter, a third pipe, and a first tee are fixedly connected in sequence to the end of the main pipe away from the protective tee;

[0015] The above technical solution allows for the regulation of water flow through pressure transmitters, regulating valves, and flow meters.

[0016] Furthermore, a first valve is fixedly connected to one inner wall of the first tee, a first pipe is fixedly connected inside the first valve, a controller is fixedly connected to the end of the first pipe away from the first valve, a seventh pipe is fixedly connected to the rear end of the outer wall of the controller, and a ninth pipe is fixedly connected to the end of the seventh pipe away from the controller.

[0017] The above technical solution allows the controller to control the overall operation of the equipment.

[0018] Furthermore, a fourth pipe is fixedly connected to the rear end of the inner wall of the first tee, a second valve is fixedly connected to the end of the fourth pipe away from the first tee, the second valve is connected in connection with the inlet pipe, a fifth pipe is fixedly connected to the end of the first silicone hose away from the overflow pipe, the fifth pipe is connected in connection with the ninth pipe, a third valve is fixedly connected to the end of the second silicone hose away from the outlet pipe, and a sixth pipe is fixedly connected inside the third valve.

[0019] The above technical solution allows for more accurate pressure detection in the equipment by using the first and second silicone hoses.

[0020] Furthermore, a solenoid valve is fixedly connected to the lower end of the outer wall of the sixth pipe, and an eighth pipe is fixedly connected to the lower surface of the solenoid valve. The eighth and ninth pipes are connected in a continuous manner to the large water tank.

[0021] The above technical solution enables the device to operate completely via a solenoid valve.

[0022] Furthermore, a chassis is fixedly connected to the upper surface of the base frame, a support frame is fixedly connected to one side of the upper surface of the fixed plate, and a display is provided at the upper end of the outer wall of the support frame;

[0023] The operation of the device can be controlled via a display using the above technical solution.

[0024] This utility model has the following beneficial effects:

[0025] 1. This utility model proposes a digital process control demonstration experimental device. Through a buffer mechanism, the inlet pipe of the small water tank can be kept suspended and separated from the tank body, eliminating the need for welding and thus eliminating the stress caused by thermal expansion and contraction or mechanical vibration of the pipe. The outlet pipe and overflow pipe are flexibly connected to the outlet pipe via a first silicone flexible hose. This material ensures both sealing and effectively absorbs axial displacement and radial sway of the pipe.

[0026] 2. The digital process control demonstration experimental device proposed in this utility model can keep the water inlet pipe of the small water tank in a suspended and separated state from the tank body through a buffer mechanism, without any welding fixation, thereby eliminating the stress caused by thermal expansion and contraction or mechanical vibration of the pipeline. The water outlet pipe and the overflow pipe are flexibly connected to the water outlet pipe through a first silicone hose. This material can ensure sealing and effectively absorb the axial displacement and radial swing of the pipeline. Attached Figure Description

[0027] Figure 1 This is an isometric view of a digital process control demonstration experimental device proposed in this utility model;

[0028] Figure 2 This is a top view of a digital process control demonstration experimental device proposed in this utility model;

[0029] Figure 3 This is a front view of a digital process control demonstration experimental device proposed in this utility model;

[0030] Figure 4 This is a rear view of the protection mechanism in a digital process control demonstration experimental device proposed in this utility model;

[0031] Figure 5 This is a schematic diagram of the buffer mechanism in a digital process control demonstration experimental device proposed in this utility model;

[0032] Figure 6 This is a top view of the protection mechanism in a digital process control demonstration experimental device proposed in this utility model.

[0033] Legend:

[0034] 1. Base frame; 2. Machine frame; 3. Mounting plate;

[0035] 4. Buffer mechanism; 401. Inlet pipe; 402. Through hole; 403. Small water tank; 404. Overflow pipe; 405. First silicone hose; 406. Outlet pipe; 407. Second silicone hose; 408. Base; 409. Weighing sensor;

[0036] 5. Chassis; 6. Monitor; 7. Support frame;

[0037] 8. Protection mechanism; 801. Water pump; 802. First component; 803. Large water tank; 804. Output pipe; 805. Protection tee; 806. Pressure relief valve; 807. First pipe valve; 808. First connecting pipe; 809. Pressure gauge; 8010. Second pipe valve; 8011. Second connecting pipe; 8012. Water level gauge; 8013. Pressure relief pipe;

[0038] 9. Control valve; 10. First pipeline; 11. Second pipeline; 12. Flow meter; 13. First valve; 14. Third pipeline; 15. First tee; 16. Fourth pipeline; 17. Second valve; 18. Third valve; 19. Fifth pipeline; 20. Solenoid valve; 21. Sixth pipeline; 22. Seventh pipeline; 23. Controller; 24. Main pipe; 25. Pressure transmitter; 26. Eighth pipeline; 27. Ninth pipeline. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] One embodiment of this utility model is provided:

[0041] Reference Figure 2 , Figure 3 and Figure 5 A digital process control demonstration experimental device includes a base frame 1. A protective mechanism 8 is provided on the upper surface of the base frame 1. The protective mechanism 8 includes a water pump 801 fixedly connected to one side of the front end of the upper surface of the base frame 1. An output pipe 804 is fixedly connected to the output end of the water pump 801. A protective tee 805 is fixedly connected to the upper end of the outer wall of the output pipe 804. A pressure relief pipe 8013 is fixedly connected to the inner wall of one side of the protective tee 805. A pressure relief valve 806 is provided in the middle of the outer wall of the pressure relief pipe 8013. A first element 802 is fixedly connected to the input end of the water pump 801. A large water tank 803 is fixedly connected to the end of the first element 802 away from the water pump 801.

[0042] A frame 2 is fixedly connected to each of the four corners of the upper surface of the base frame 1. A fixed plate 3 is fixedly connected to the middle of the inner wall of the frame 2. A buffer mechanism 4 is provided on one side of the upper surface of the fixed plate 3. The buffer mechanism 4 includes a base 408 fixedly connected to the rear end of one side of the upper surface of the fixed plate 3. A weighing sensor 409 is provided inside the base 408. A small water tank 403 is fixedly connected to the upper surface of the base 408. A through hole 402 is opened on one side of the upper end of the outer wall of the small water tank 403. A water inlet pipe 401 is provided inside the through hole 402. An overflow pipe 404 and a water outlet pipe 406 are fixedly connected to the upper and lower ends of the outer wall of the small water tank 403 away from the through hole 402, respectively. A first silicone hose 405 is fixedly connected to the end of the overflow pipe 404 away from the small water tank 403. A second silicone hose 407 is fixedly connected to the end of the water outlet pipe 406 away from the small water tank 403.

[0043] The buffer mechanism 4 allows the inlet pipe 401 of the small water tank 403 to remain suspended and separated from the tank body, eliminating the need for welding and thus preventing stress caused by thermal expansion and contraction or mechanical vibration. The outlet pipe 406 and overflow pipe 404 are flexibly connected via a first silicone hose 405, ensuring both sealing and effective absorption of axial displacement and radial sway in the pipes.

[0044] Reference Figure 3 , Figure 4 and Figure 6 A first connecting pipe 808 is fixedly connected to the upper end of the outer wall of the large water tank 803 on the side away from the first element 802. A first pipe valve 807 is fixedly connected to the middle of the outer wall of the first connecting pipe 808. A pressure gauge 809 is fixedly connected to the end of the first connecting pipe 808 away from the large water tank 803. The buffer mechanism 4 can keep the inlet pipe 401 of the small water tank 403 suspended and separated from the tank body of the small water tank 403, without welding fixation, thereby eliminating the stress caused by thermal expansion and contraction or mechanical vibration of the pipeline. The outlet pipe 406 and the overflow pipe 404 are flexibly connected to the outlet pipe 406 through the first silicone hose 405. This material can ensure sealing and effectively absorb the axial displacement and radial swing of the pipeline.

[0045] Reference Figure 1 , Figure 2 and Figure 3A water level gauge 8012 is fixedly connected to the outer wall of the front end of the large water tank 803. A second pipe valve 8010 is fixedly connected to the lower end of the outer wall of the large water tank 803 on the side away from the first element 802. A second connecting pipe 8011 is fixedly connected to the inner wall of the second pipe valve 8010. The water level of the large water tank 803 can be observed through the water level gauge 8012. A main pipe 24 is fixedly connected to the upper end of the inner wall of the protective tee 805. A pressure transmitter 25, a regulating valve 9, a second pipe 11, a flow meter 12, a third pipe 14, and a first tee 15 are fixedly connected sequentially to the end of the main pipe 24 away from the protective tee 805. The water flow can be regulated through the pressure transmitter 25, the regulating valve 9, the flow meter 12, and the pressure transmitter 25. A first valve 13 is fixedly connected to the inner wall of one side of the first tee 15. A first pipe 10 is fixedly connected inside the first valve 13. The first pipe 10 is located away from the first valve 13. One end of the device is fixedly connected to a controller 23. The rear end of the outer wall of the controller 23 is fixedly connected to a seventh pipe 22. The end of the seventh pipe 22 away from the controller 23 is fixedly connected to a ninth pipe 27. The controller 23 can control the overall operation of the device. The rear end of the inner wall of the first tee 15 is fixedly connected to a fourth pipe 16. The end of the fourth pipe 16 away from the first tee 15 is fixedly connected to a second valve 17. The second valve 17 is connected to the inlet pipe 401. The end of the first silicone hose 405 away from the overflow pipe 404 is fixedly connected to a fifth pipe 19. The fifth pipe 19 is connected to the ninth pipe 27. The end of the second silicone hose 407 away from the outlet pipe 406 is fixedly connected to a third valve 18. The inside of the third valve 18 is fixedly connected to a sixth pipe 21. The first silicone hose 405 and the second silicone hose 407 can make the pressure detection of the device more accurate.

[0046] Reference Figure 1 and Figure 2 A solenoid valve 20 is fixedly connected to the lower end of the outer wall of the sixth pipe 21. An eighth pipe 26 is fixedly connected to the lower surface of the solenoid valve 20. The eighth pipe 26 and the ninth pipe 27 are connected to the large water tank 803. The solenoid valve 20 can make the device run completely. A housing 5 is fixedly connected to the upper surface of the base frame 1. A support frame 7 is fixedly connected to one side of the upper surface of the fixing plate 3. A display 6 is set at the upper end of the outer wall of the support frame 7. The operation of the device can be controlled through the display 6.

[0047] Working principle:

[0048] (a) Sequential start-up and shutdown of process equipment and alarm interlock start-up and shutdown control.

[0049] Water filling small water tank 403: Open inlet solenoid valve 20 → regulating valve 9 → start pump → water level exceeds upper limit → alarm interlock stops pump.

[0050] Water tank 403 drain: Water level above the upper limit → Open return water solenoid valve 20

[0051] It can also perform interlock control of temperature upper and lower limits, pressure upper and lower limits, weight upper and lower limits, and solenoid valve 20 and water pump 801.

[0052] (ii) Closed-loop control of the liquid level in the large water tank 803.

[0053] First, input the set value of the liquid level in the large water tank 803. The program then uses PID adjustment to tune the control output value based on the difference between the liquid level feedback value and the set value (the control output value can be the frequency of the water pump 801 or the opening degree of the regulating valve 9) to achieve constant liquid level control.

[0054] (iii) Closed-loop control of the weight of the small water tank 403.

[0055] First, input the weight set value. The program then uses PID adjustment to tune the control output value based on the difference between the weight feedback value and the set value. The control output value can be the frequency of the water pump 801 or the opening degree of the regulating valve 9, thereby achieving constant weight control.

[0056] (iv) Buffer mechanism 4 Flow closed-loop control.

[0057] First, input the flow rate setpoint. The program then uses PID adjustment to tune the control output value based on the difference between the flow rate feedback value and the setpoint. The control output value can be the frequency of the water pump 801 or the opening degree of the regulating valve 9, thereby achieving constant flow rate control.

[0058] (v) Closed-loop control of pressure in chassis 5.

[0059] First, input the pressure setpoint. The program then uses PID adjustment to tune the control output value based on the pressure feedback value and the difference between the setpoint and the pressure. The control output value can be the frequency of the water pump 801 or the opening degree of the regulating valve 9, thereby achieving constant pressure control.

[0060] (vi) Closed-loop control of water tank temperature.

[0061] First, input the temperature setpoint. The program then uses PID control to adjust the output value based on the temperature feedback value and the difference between the setpoint and the output value. The output value is the current of the thyristor voltage regulator, thus achieving constant temperature control.

[0062] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A digital process control demonstration experimental device, comprising a base frame (1), characterized in that: The upper surface of the base frame (1) is provided with a protective mechanism (8). The protective mechanism (8) includes a water pump (801) fixedly connected to one side of the front end of the upper surface of the base frame (1). The output end of the water pump (801) is fixedly connected to an output pipe (804). The upper end of the outer wall of the output pipe (804) is fixedly connected to a protective tee (805). The inner wall of one side of the protective tee (805) is fixedly connected to a pressure relief pipe (8013). The middle part of the outer wall of the pressure relief pipe (8013) is provided with a pressure relief valve (806). The input end of the water pump (801) is fixedly connected to a first element (802). The end of the first element (802) away from the water pump (801) is fixedly connected to a large water tank (803). The four corners of the upper surface of the base frame (1) are all fixedly connected to the frame (2). The middle of the inner wall of the frame (2) is fixedly connected to the fixing plate (3). A buffer mechanism (4) is provided on one side of the upper surface of the fixing plate (3). The buffer mechanism (4) includes a base (408) fixedly connected to the rear end of one side of the upper surface of the fixing plate (3). A weighing sensor (409) is provided inside the base (408). A small water tank (403) is fixedly connected to the upper surface of the base (408). A through hole (402) is provided on one side of the upper end of the outer wall of the small water tank (403). An inlet pipe (401) is provided inside the through hole (402). An overflow pipe (404) and an outlet pipe (406) are fixedly connected to the upper and lower ends of the outer wall of the small water tank (403) away from the through hole (402), respectively. A first silicone hose (405) is fixedly connected to the end of the overflow pipe (404) away from the small water tank (403), and a second silicone hose (407) is fixedly connected to the end of the outlet pipe (406) away from the small water tank (403).

2. The digital process control demonstration experimental device according to claim 1, characterized in that: The upper end of the outer wall of the large water tank (803) away from the first element (802) is fixedly connected to a first connecting pipe (808), the middle part of the outer wall of the first connecting pipe (808) is fixedly connected to a first pipe valve (807), and the end of the first connecting pipe (808) away from the large water tank (803) is fixedly connected to a pressure gauge (809).

3. The digital process control demonstration experimental device according to claim 1, characterized in that: A water level gauge (8012) is fixedly connected to the front outer wall of the large water tank (803). A second pipe valve (8010) is fixedly connected to the lower end of the outer wall of the large water tank (803) away from the first element (802). A second connecting pipe (8011) is fixedly connected to the inner wall of the second pipe valve (8010).

4. The digital process control demonstration experimental device according to claim 1, characterized in that: The upper end of the inner wall of the protective tee (805) is fixedly connected to a main pipe (24), and the end of the main pipe (24) away from the protective tee (805) is fixedly connected in sequence to a pressure transmitter (25), a regulating valve (9), a second pipe (11), a flow meter (12), a third pipe (14) and a first tee (15).

5. The digital process control demonstration experimental device according to claim 4, characterized in that: A first valve (13) is fixedly connected to one side of the inner wall of the first tee (15). A first pipe (10) is fixedly connected inside the first valve (13). A controller (23) is fixedly connected to one end of the first pipe (10) away from the first valve (13). A seventh pipe (22) is fixedly connected to the rear end of the outer wall of the controller (23). A ninth pipe (27) is fixedly connected to one end of the seventh pipe (22) away from the controller (23).

6. The digital process control demonstration experimental device according to claim 4, characterized in that: A fourth pipe (16) is fixedly connected to the rear end of the inner wall of the first tee (15). A second valve (17) is fixedly connected to the end of the fourth pipe (16) away from the first tee (15). The second valve (17) is connected to the inlet pipe (401). A fifth pipe (19) is fixedly connected to the end of the first silicone hose (405) away from the overflow pipe (404). The fifth pipe (19) is connected to the ninth pipe (27). A third valve (18) is fixedly connected to the end of the second silicone hose (407) away from the outlet pipe (406). A sixth pipe (21) is fixedly connected inside the third valve (18).

7. The digital process control demonstration experimental device according to claim 6, characterized in that: A solenoid valve (20) is fixedly connected to the lower end of the outer wall of the sixth pipe (21), and an eighth pipe (26) is fixedly connected to the lower surface of the solenoid valve (20). The eighth pipe (26) and the ninth pipe (27) are connected to the large water tank (803).

8. The digital process control demonstration experimental device according to claim 1, characterized in that: The upper surface of the base frame (1) is fixedly connected to the housing (5), and a support frame (7) is fixedly connected to one side of the upper surface of the fixing plate (3). A display (6) is provided on the upper end of the outer wall of the support frame (7).

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