TWM552845U - Pressure-compensation-controlled feeding system - Google Patents

Description

Pressure compensation control feeding system

The present invention relates to a liquid material supply system, and more particularly to a feed system with pressure compensation control.

Ultrasonic spraying is a non-vacuum coating technology. Ultrasonic spraying has a high material utilization rate, which not only can reduce the consumption of expensive materials and environmental protection, but also can be produced in a large area. Its characteristics are high liquid supply control precision. With low material loss, high yield and high production capacity, it will further reduce the current high production cost of the coating industry, which is in line with the needs of modern industrial manufacturing.

For example, Taiwan Patent No. M517023 discloses a pressure supply closed loop control system, which mainly senses the pressure of the liquid outlet through a liquid pressure sensor, and feedbacks the pressure of the output gas of the control air pressure controller, thereby precisely controlling The internal pressure of the pressure tank can control the discharge amount of the liquid material to meet the manufacturing requirements.

However, for the continuous spraying process, the liquid material filled in the volumetric capacity of the pressure tank cannot meet the demand for continuous spraying for a long time. Therefore, a feeding device for establishing a liquid material on the pressure tank is currently available, and the feeding device can be sprayed. The process continues to provide liquid material into the pressure tank to meet long-term spraying needs.

Conventional feeding devices, which are used for feeding in a pressure tank, usually use gear pumping, peristaltic pumping, plug-in pumping or screw pumping. All kinds of pumps can be fed with a very precise amount of precision. In the process of feeding, since the pressure tank is a gas-tight space with a certain pressure, when the liquid material is squeezed into the pressure tank, there will be a pulse wave phenomenon due to the unstable flow rate, and the liquid pressure in the pressure tank will not be caused. Stable, further affecting the quality of ultrasonic spraying, can not meet the needs of precision coating.

The primary purpose of the present invention is to disclose a feed system that provides a source of stable fluid pressure.

In order to achieve the above object, the present invention is a pressure compensation control feeding system comprising a pressure tank, a pressure sensor, a liquid level sensor, a gas pressure adjusting component, a feeding device and a controller, wherein The pressure tank is for holding a liquid material, the pressure sensor senses the pressure inside the pressure tank, and the pressure sensor is mounted on the pressure tank, and the liquid level sensor senses the liquid material Positioned on the pressure tank, the air pressure adjusting element adjusts the pressure inside the pressure tank, and has a pneumatic pipeline connecting the pressure tank, and the air pressure adjusting component inputs a regulating air pressure through the air pressure pipeline to enter The pressure bucket.

The feeding device supplies the liquid material into the pressure tank, and the feeding device communicates with the pressure tank, and the controller connects the pressure sensor, the liquid level sensor, the air pressure adjusting component and the feeding And performing proportional proportional calculation control on the pressure signal and the liquid level signal sensed by the pressure sensor and the liquid level sensor, thereby generating a differential calculation control signal to control the air pressure adjusting component and the feeding device The operation dynamically adjusts the pressure of the liquid in the pressure tank.

Accordingly, the present invention mainly obtains the pressure signal and the liquid level signal respectively sensed by the pressure sensor and the liquid level sensor, and performs proportional differential calculation control through the controller, and simultaneously controls the air pressure adjusting component and the The action of the feeding device, in turn, reduces the pulse wave phenomenon of the instantaneous flow rate generated when the feeding device performs feeding, and provides a source of stable fluid pressure.

The detailed description and technical content of this new model are described below with the following diagram:

Please refer to FIG. 1 , which is a system architecture diagram and an internal operation function diagram of the controller according to a preferred embodiment of the present invention. As shown in the figure, the present invention is a pressure compensation control feeding system including a pressure tank. 10, a pressure sensor 20, a liquid level sensor 30, a gas pressure regulating element 40, a feeding device 50 and a controller 60, wherein the pressure tank 10 is filled with a liquid material (not shown), And the pressure tank 10 can be added with a pressure relief valve 70.

The pressure sensor 20 senses the pressure inside the pressure tank 10, and the pressure sensor 20 is mounted on the pressure tank 10. In practice, the bottom of the pressure tank 10 can be connected to a pressure detecting tube 11 The pressure sensor 20 is mounted on the pressure detecting tube 11, whereby the pressure sensor 20 can be easily replaced by maintenance.

The liquid level sensor 30 senses the liquid level of the liquid material and is mounted on the pressure tank 10. In actual implementation, the pressure tank 10 can have a communication tube 12, and both ends of the communication tube 12 The pressure tank 10 is connected to the pressure tank 10 and has a vertical section 121. The liquid level sensor 30 is disposed in the vertical section 121. The liquid level sensor 30 includes a first liquid level sensing component 31 and a first The two liquid level sensing elements 32, the first liquid level sensing element 31 and the second liquid level sensing element 32 are respectively disposed at different height positions in the vertical section 121.

The air pressure adjusting component 40 adjusts the pressure inside the pressure tank 10 and has a pneumatic line 13 connected to the pressure tank 10. The air pressure adjusting component 40 inputs a regulating air pressure (not shown) through the air pressure pipeline 13 to enter. The pressure tank 10. The air pressure adjusting component 40 can include a proportional valve 41 coupled to the controller 60 and a regulated air pressure source 42 that provides a fixed air pressure. The proportional valve 41 communicates with the regulating air pressure source 42 and the air pressure line 13 and is received by the controller. The control of 60 adjusts the pressure of the regulated air pressure.

The feeding device 50 supplies the liquid material into the pressure tank 10, and the feeding device 50 communicates with the pressure tank 10. The feeding device 50 can include a peristaltic pump 51, and a power supply for providing the peristaltic pump 51. a gas pressure source 52 and an analog output module 53 for controlling the peristaltic pump 51. The analog output module 53 is coupled to the controller 60. The peristaltic pump 51 has a supply line 14 communicating with the pressure tank 10 for supply. The liquid material enters the pressure tank 10, and the supply line 14 can be provided with a check valve 54 to prevent backflow of the liquid material.

The controller 60 connects the pressure sensor 20 , the liquid level sensor 30 , the air pressure adjusting component 40 and the feeding device 50 , and receives the pressure sensor 20 and the liquid level sensor 30 . The sensed pressure signal and the liquid level signal are subjected to proportional differential calculation control to generate a differential calculation control signal to control the operation of the air pressure adjusting element 40 and the feeding device 50, and dynamically adjust the liquid pressure in the pressure tank 10.

Moreover, the pressure tank 10 can further have a discharge line 15 connected to an ultrasonic nozzle 80, and the ultrasonic nozzle 80 is coupled to the controller 60, and the discharge line 15 can be further set. A mass flow controller 81 precisely controls the flow rate of the ultrasonic jet 80, and the mass flow controller 81 is coupled to the controller 60.

Please refer to FIG. 2 again. The controller 60 can include a logic control unit 61. The pressure sensor 20 (or the liquid level sensor 30) is obtained by an analog signal input unit 62. The signal is connected to an external terminal 90 by a digital output control unit 63; the operation of the ultrasonic nozzle 80 is controlled by a pulse signal unit 64; and the mass flow controller 81 is connected through a digital communication unit 65. The controller 60 further includes a calculation unit 66, a proportional integral control unit 67 and an analog signal output unit 68 for calculating and controlling the proportional valve 41 or the peristaltic pump 51 (using another set of calculation units 66, the ratio The integral control unit 67 and the analog signal output unit 68).

Please refer to FIG. 3 again, which is a control flowchart of the present invention. Initially, step S1 is performed: "Is liquid level detection reached?", which is performed by the first liquid level sensing element 31. The second liquid level sensing element 32 performs the detection liquid level. Since the first liquid level sensing element 31 and the second liquid level sensing element 32 have different heights, the liquid level can be accurately obtained to determine whether to feed the liquid. Before the feeding, the pressure relief valve 70 is first released, and after the feeding is completed, the pressure regulating element 40 is pressurized.

Then, step S2 is performed: "Is pressure detection arrived?", which is to perform pressure adjustment of the pressure tank 10, which first senses whether the pressure inside the pressure tank 10 satisfies the demand (30-40 PSI) by the pressure sensor 20. If it is otherwise pressurized by the air pressure adjusting element 40 until the pressure is completed.

Then, step S3: "pressure detection", step S4: "painting", step S5: "flow rate control" and step S6: "liquid level detection" are performed simultaneously, that is, during the painting process, pressure detection is continuously performed. Replenishment, level detection and feeding and flow control until the end.

Please refer to Figure 4 again. It is a new flow compensation control flow chart. When the controller is started, the pressure tank preset parameters are used. The new type will perform pressure compensation control, and at the same time, the pressure is controlled. The sensor 20 and the liquid level sensor 30 simultaneously and continuously perform step T1: pressure detection and step T2: liquid level detection. When the pressure is unstable, the gas pressure adjusting element 40 is controlled by a proportional integral (PID) calculation. Make pressure or depressurize until steady state. When the liquid level is unstable, the feed rate of the feeding device 50 is also controlled after the proportional integral (PID) calculation, that is, the rotation speed of the peristaltic pump 51 is changed, and the liquid level is adjusted by using the increase or decrease of the rotation speed to reach the liquid level. Steady state.

Accordingly, the advantages of the present invention over conventional ones are:

1. Perform proportional proportional calculation control through the controller, and simultaneously control the operation of the air pressure adjusting component and the feeding device, thereby reducing the pulse wave phenomenon of instantaneous flow rate generated when the feeding device performs feeding, and providing Stabilize the source of fluid pressure.

2. During the feeding process of the feeding device, the internal pressure of the pressure tank can be stabilized within a certain range, and the influence of the pulse wave phenomenon is reduced, which can meet the requirements of micro flow rate and continuous feeding.

3. The feeding of the feeding device does not affect the spraying operation, and a stable fluid pressure source can be stably supplied for a long time to meet the requirements of the one-to-multiple channel fluid supply system.

4. The pressure sensor and the liquid level sensor are externally designed to meet the requirements of rapid maintenance and replacement.

Therefore, this new type is highly progressive and meets the requirements for applying for a new type of patent. It is required to apply in accordance with the law, and the Bureau of Health will grant patents as soon as possible.

The present invention has been described in detail above, but the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited. That is, the equal changes and modifications made in accordance with the scope of this new application shall remain within the scope of the patent of this new type.

10‧‧‧ Pressure Barrel
11‧‧‧ Pressure test tube
12‧‧‧Connected pipe
121‧‧‧ vertical section
13‧‧‧ pneumatic pipeline
14‧‧‧Feed line
15‧‧‧Drainage line
20‧‧‧ Pressure Sensor
30‧‧‧Level sensor
31‧‧‧First level sensing element
32‧‧‧Second level sensing element
40‧‧‧Pneumatic adjustment element
41‧‧‧Proportional valve
42‧‧‧Adjust air pressure source
50‧‧‧Feeding device
51‧‧‧Peristaltic pump
52‧‧‧Feed air pressure source
53‧‧‧ analog output module
54‧‧‧Check valve
60‧‧‧ Controller
61‧‧‧Logical Control Unit
62‧‧‧ analog signal input unit
63‧‧‧Digital Output Control Unit
64‧‧‧pulse signal unit
65‧‧‧Digital Communication Unit
66‧‧‧ calculus unit
67‧‧‧Proportional integral control unit
68‧‧‧ analog signal output unit
70‧‧‧pressure relief valve
80‧‧‧Ultrasonic nozzle
81‧‧‧mass flow controller
90‧‧‧Digital terminals

FIG. 1 is a system architecture diagram of a preferred embodiment of the present invention. FIG. 2 is a diagram showing the internal operation function of the controller according to a preferred embodiment of the present invention. 3 is a flow chart showing control of a control system in accordance with a preferred embodiment of the present invention. 4 is a flow chart of pressure compensation control according to a preferred embodiment of the present invention.

10‧‧‧ Pressure Barrel

11‧‧‧ Pressure test tube

12‧‧‧Connected pipe

121‧‧‧ vertical section

13‧‧‧ pneumatic pipeline

14‧‧‧Feed line

15‧‧‧Drainage line

20‧‧‧ Pressure Sensor

30‧‧‧Level sensor

31‧‧‧First level sensing element

32‧‧‧Second level sensing element

40‧‧‧Pneumatic adjustment element

41‧‧‧Proportional valve

42‧‧‧Adjust air pressure source

50‧‧‧Feeding device

51‧‧‧Peristaltic pump

52‧‧‧Feed air pressure source

53‧‧‧ analog output module

54‧‧‧Check valve

60‧‧‧ Controller

70‧‧‧pressure relief valve

80‧‧‧Ultrasonic nozzle

81‧‧‧mass flow controller

Claims (10)

A pressure compensation control feeding system comprising: a pressure tank for containing a liquid material; a pressure sensor for sensing a pressure inside the pressure tank, the pressure sensor being mounted on the pressure tank; a liquid level sensor that senses a liquid level of the liquid material, the liquid level sensor is mounted on the pressure tank; a gas pressure adjusting element that adjusts a pressure inside the pressure tank, the air pressure adjusting element has a connection a pressure pipeline of the pressure tank, the gas pressure regulating component inputs a regulating air pressure into the pressure tank through the air pressure pipeline; a feeding device for supplying the liquid material into the pressure tank, the feeding device is connected to the pressure tank; And a controller connecting the pressure sensor, the liquid level sensor, the air pressure adjusting component and the feeding device, and receiving the pressure sensed by the pressure sensor and the liquid level sensor The signal is proportional to the liquid level signal and the proportional differential calculation control is performed to generate a differential calculation control signal to control the operation of the air pressure adjusting component and the feeding device, and dynamically adjust the liquid pressure in the pressure tank. The pressure compensation control feeding system of claim 1, wherein the bottom of the pressure tank is connected to a pressure detecting tube, and the pressure sensor is mounted on the pressure detecting tube. The pressure compensation control feeding system of claim 1, wherein the pressure tank has a connecting pipe, both ends of the connecting pipe are connected to the pressure tank, and have a vertical section, the liquid level sensing The device is mounted in the vertical section. The pressure compensation control feeding system of claim 3, wherein the liquid level sensor comprises a first liquid level sensing element and a second liquid level sensing element, the first liquid level sensing The component and the second liquid level sensing component are respectively disposed at different height positions within the vertical segment. The pressure compensation control supply system of claim 1, wherein the air pressure adjusting component comprises a proportional valve coupled to the controller and a regulated air pressure source providing a fixed air pressure, the proportional valve communicating with the regulating air pressure source The pneumatic line is controlled by the controller to adjust the pressure of the regulated air pressure. The pressure compensation control feeding system according to claim 1, wherein the feeding device comprises a peristaltic pump, a supply air pressure source for supplying power required by the peristaltic pump, and an analog output mode for controlling the peristaltic pump. The analog output module is coupled to the controller, the peristaltic pump having a supply line connecting the pressure tank to supply the liquid material into the pressure tank. The pressure compensation control supply system according to claim 6, wherein the supply line is provided with a check valve. The pressure compensation control feeding system of claim 1, wherein the pressure tank further has a discharge line connected to an ultrasonic nozzle, and the ultrasonic nozzle is coupled to the controller. The pressure compensation control supply system of claim 8, wherein the discharge line further comprises a mass flow controller, and the mass flow controller is coupled to the controller. The pressure compensation control feeding system according to claim 1, wherein the pressure tank is further provided with a pressure relief valve.