A PET bottle filling diaphragm valve cylinder control system and control method

Abstract

The application discloses a PET bottle filling diaphragm valve cylinder control system and a control method, and relates to the technical field of filling equipment.The application comprises a diaphragm valve cylinder and gas paths A and B for controlling the diaphragm valve cylinder; the gas path A is communicated with an upper cavity for controlling the diaphragm valve cylinder; the gas path B is communicated with a lower cavity for controlling the diaphragm valve cylinder, the gas path B comprises a gas path C and a gas path D, the gas pressure of the gas path C is higher than that of the gas path D; the application further comprises a controller, the gas paths A, B, C and D are all provided with valves, and the controller is electrically connected with the valves of the gas paths.The application connects high-pressure and low-pressure gas paths to the lower cavity of the diaphragm valve cylinder, adopts high-low pressure gas automatic switching technology, combines bottle flow detection with high-low pressure gas switching technology, thereby effectively reducing the wear of a valve rod sealing ring, reducing valve block impact, and prolonging the service life of the diaphragm valve cylinder.

Description

Technical Field

[0001] This invention belongs to the field of filling equipment technology, and in particular relates to a PET bottle filling membrane valve cylinder control system and control method. Background Technology

[0002] During PET bottle filling, a bottle clamping plate is typically used to secure the bottle neck, ensuring proper bottle turnover during the filling process. For example, Chinese invention patent application CN108529529A discloses a short-stroke PET bottle lifting device for a filling machine. As can be seen from the description and accompanying drawings, during filling, a diaphragm valve cylinder lifts the bottle clamping plate, raising the bottle to seal the neck. After filling, the diaphragm valve cylinder lowers the bottle clamping plate, lowering the bottle for turnover. The diaphragm valve cylinder is automatically controlled; when bottle flow enters, high-pressure gas pushes the valve rod upward, quickly lifting the bottle to seal the neck.

[0003] During normal filling, the diaphragm valve cylinder rod lifts using high-pressure gas for rapid action, which is beneficial for meeting process requirements. However, due to various external factors such as capacity constraints between different parts of the production line or short line interruptions, the bottle flow entering the filling equipment cannot be maintained continuously and may be intermittent. When there is no bottle flow entering the filling area, continuing to use high-pressure gas for rod lifting may have some adverse effects on the diaphragm valve cylinder: Firstly, the high-pressure gas will push the valve rod to move rapidly, accelerating the wear of the cylinder piston rod seal to some extent, which may reduce the service life of the piston rod seal over time. Secondly, the rapid rise of the valve rod when there is no bottle flow will cause the valve block to impact; prolonged impact may damage the valve block, and in severe cases, may cause the diaphragm valve cylinder to malfunction. Summary of the Invention

[0004] The purpose of this invention is to provide a control system for a PET bottle filling diaphragm valve cylinder. By connecting a high-pressure gas path and a low-pressure gas path to the lower chamber of the diaphragm valve cylinder and employing automatic high-low pressure gas switching technology, this system combines bottle flow detection with high-low pressure gas switching technology. This effectively reduces wear on the valve stem sealing ring, mitigates valve block impact, and extends the service life of the diaphragm valve cylinder. It also solves the problem in existing technologies where rapid operation of the diaphragm valve cylinder leads to easy damage and affects its service life. Another objective of this invention is to provide a control method for a PET bottle filling diaphragm valve cylinder.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a PET bottle filling diaphragm valve cylinder control system, comprising a diaphragm valve cylinder and air passages A and B for controlling the diaphragm valve cylinder; air passage A is connected to the upper chamber of the diaphragm valve cylinder; air passage B is connected to the lower chamber of the diaphragm valve cylinder, air passage B includes branch air passage C and branch air passage D, the air pressure of branch air passage C is higher than the air pressure of branch air passage D; it also includes a controller, and each of air passages A, B, branch air passage C and D is provided with a valve, and the controller is electrically connected to the valve of each air passage.

[0007] As a preferred technical solution of the present invention, it also includes a bottle flow detection device for detecting bottle flow signals, wherein the bottle flow detection device is electrically connected to the controller.

[0008] As a preferred technical solution of the present invention, pneumatic dual-units are provided at the air inlets of air passage A and air passage B.

[0009] As a preferred technical solution of the present invention, the gas path A is provided with a third pressure reducing valve and a first valve island, and the first valve island is electrically connected to the controller;

[0010] The gas path B is equipped with a second valve island, which is electrically connected to the controller;

[0011] The gas distribution path C is equipped with a second pressure reducing valve and a second valve, and the second valve is electrically connected to the controller;

[0012] The gas distribution path D is equipped with a first pressure reducing valve and a first valve, and the first valve is electrically connected to the controller.

[0013] As a preferred technical solution of the present invention, a first solenoid valve is provided between the controller and the second valve, and the controller controls the opening and closing of the second valve through the first solenoid valve;

[0014] A second solenoid valve is provided between the controller and the first valve, and the controller controls the opening and closing of the first valve through the second solenoid valve.

[0015] The control method based on the above-mentioned PET bottle filling diaphragm valve cylinder control system includes the following steps:

[0016] Step 1: The bottle flow detection device detects the bottle flow and delivers it to the filling area; the bottle is then inserted into the bottle clamping plate.

[0017] Step 2: The controller controls the first solenoid valve to open the second valve, and at the same time opens the second valve island. High-pressure gas enters the lower chamber of the diaphragm valve cylinder, and the valve stem lifts the bottle quickly to perform the filling action.

[0018] Step 3: The controller closes the second valve island and opens the first valve island at the same time. Compressed air enters the upper chamber of the diaphragm valve cylinder, and the valve stem lowers the filled bottle to the turnover position.

[0019] Step 4: When the bottle flow detection device does not detect bottle flow for a period of time, the controller controls the first solenoid valve to close the second valve, and at the same time controls the solenoid valve to open the first valve and the second valve island. Low-pressure compressed air enters the lower chamber of the diaphragm valve cylinder, causing the valve stem to slowly rise.

[0020] Step 5: Repeat steps 1 through 4.

[0021] The present invention has the following beneficial effects:

[0022] This invention connects a high-pressure gas path and a low-pressure gas path to the lower chamber of the diaphragm valve cylinder and employs an automatic high-low pressure gas switching technology. By combining bottle flow detection with high-low pressure gas switching technology, when no bottle flow is detected for an extended period, the control system automatically switches to low pressure gas, ensuring that the diaphragm valve cylinder stem rises slowly. This effectively reduces wear on the valve stem sealing ring, mitigates valve block impact, and improves the service life of the diaphragm valve cylinder.

[0023] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic flowchart of a PET bottle filling diaphragm valve cylinder control system according to the present invention.

[0026] Figure 2 This is a schematic flowchart of a PET bottle filling diaphragm valve cylinder control method according to the present invention;

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1-Diaphragm valve cylinder, 2-Bottle flow detection device, 3-Pneumatic dual unit, 4-First pressure reducing valve, 5-First valve, 6-Second pressure reducing valve, 7-Second valve, 8-Third pressure reducing valve, 9-First valve island, 10-Second valve island, 11-First solenoid valve, 12-Second solenoid valve, 13-Controller, 14-Bottle flow. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] When PET bottles are filled on a current filling machine, the process is as follows: a diaphragm valve cylinder lifts a bottle clamping plate, causing the bottle to rise and seal the neck; after filling, the diaphragm valve cylinder lowers the bottle clamping plate, causing the bottle to descend for turnover. The diaphragm valve cylinder is automatically controlled. When bottle flow enters, high-pressure gas pushes the valve rod upward, quickly lifting the bottle to seal the neck. However, due to capacity constraints between different parts of the production line or short line interruptions, the bottle flow entering the filling equipment cannot be continuous and may be intermittent. When there is no bottle flow, continuing to use high-pressure gas to lift the valve rod may have some adverse effects on the diaphragm valve cylinder: firstly, the high-pressure gas will push the valve rod to move rapidly, accelerating the wear of the cylinder piston rod seal to some extent, potentially reducing its service life over time. Secondly, the rapid rise of the valve rod when there is no bottle flow can cause the valve block to impact; prolonged impact may damage the valve block, and in severe cases, may cause the diaphragm valve cylinder to malfunction. Based on this, this embodiment provides a PET bottle filling diaphragm valve cylinder control system. By connecting a high-pressure gas path and a low-pressure gas path to the lower chamber of the diaphragm valve cylinder, and adopting high-low pressure gas automatic switching technology, the bottle flow detection is combined with the high-low pressure gas switching technology, thereby effectively reducing the wear of the valve stem sealing ring, reducing the impact of the valve block, and improving the service life of the diaphragm valve cylinder.

[0031] Please see Figure 1 As shown, the diaphragm valve cylinder control system includes a diaphragm valve cylinder 1 and air passages A and B for controlling the diaphragm valve cylinder 1, as well as a controller 13. Air passages A and B are connected to compressed air through a single inlet, where a pneumatic dual-unit 3 is installed for pressure stabilization and filtration of moisture in the air. Air passage A is equipped with a third pressure reducing valve 8 and a first valve island 9, which is electrically connected to the controller 13. Air passage B is equipped with a second valve island 10, which is also electrically connected to the controller 13. Air passage A is connected to the upper chamber of the diaphragm valve cylinder 1, and air passage B is connected to the lower chamber of the diaphragm valve cylinder 1. The controller 13 controls the on / off state of each air passage, thereby controlling the various actions of the diaphragm valve cylinder 1.

[0032] In this embodiment, gas path B is divided into gas branch path C and gas branch path D. Gas branch path C is equipped with a second pressure reducing valve 6 and a second valve 7, with the second valve 7 electrically connected to the controller 13. Gas branch path D is equipped with a first pressure reducing valve 4 and a first valve 5, with the first valve 5 electrically connected to the controller 13. Through pressure regulation by the second pressure reducing valve 6 and the first pressure reducing valve 4, gas branch path C is adjusted to a high-pressure gas path, and gas branch path D is adjusted to a low-pressure gas path. That is, the gas path is divided into two branches by the valve stem of the diaphragm valve cylinder 1, and the automatic switching between high and low pressure gas is achieved by using valve control.

[0033] Among them, the first valve 5 and the second valve 7 are pneumatic butterfly valves.

[0034] A first solenoid valve 11 is provided between the controller 13 and the second valve 7. The controller 13 controls the opening and closing of the second valve 7 through the first solenoid valve 11.

[0035] A second solenoid valve 12 is provided between the controller 13 and the first valve 5. The controller 13 controls the opening and closing of the first valve 5 through the second solenoid valve 12.

[0036] In addition, in this embodiment, a bottle flow detection device 2 for detecting the bottle flow 14 signal is also provided. The bottle flow detection device 2 is electrically connected to the controller 13 and can detect the bottle flow status in real time.

[0037] Based on the control method of the PET bottle filling diaphragm valve cylinder control system described above, please refer to [link to relevant documentation]. Figure 2 As shown, it includes the following steps:

[0038] Step 1: During normal production, the bottle flow detection device 2 detects the bottle flow 14 and delivers it to the filling area, where the bottle is inserted into the bottle clamping plate.

[0039] Step 2: Controller 13 controls the first solenoid valve 11 to open the second valve 7, and at the same time opens the second valve island 10. High-pressure gas enters the lower chamber of the diaphragm valve cylinder 1, and the valve stem carries the bottle up quickly until the bottle mouth is sealed, and the filling machine performs the filling action.

[0040] At this time, the upper chamber air passage A of the diaphragm valve cylinder 1 is disconnected, and the lower chamber air passage D is also disconnected.

[0041] Step 3: After filling is completed, the controller 13 closes the second valve island 10, disconnects the air circuit B, and at the same time opens the first valve island 9 to connect the air circuit A. Compressed air enters the upper chamber of the diaphragm valve cylinder 1, and the valve rod carries the filled bottle down to the turnover position to move to the next process.

[0042] Step 4: If the bottle flow detection device 2 does not detect bottle flow 14 for a period of time, such as after 10 seconds, the controller 13 controls the first solenoid valve 11 to close the second valve 7, disconnecting the air circuit C. At the same time, it controls the solenoid valve 12 to open the first valve 5, connecting the air circuit D, and opening the second valve island 10. Low-pressure compressed air enters the lower chamber of the diaphragm valve cylinder 1, causing the valve stem to slowly rise.

[0043] Step 5: Repeat steps 1 to 4 until the bottle flow detection device 2 detects the bottle flow 14 again.

[0044] In summary, the PET bottle filling diaphragm valve cylinder control system provided in this embodiment connects a high-pressure gas path and a low-pressure gas path to the lower chamber of the diaphragm valve cylinder, and adopts high-low pressure gas automatic switching technology. By combining bottle flow detection with high-low pressure gas switching technology, when no bottle flow is detected for a long time, the control system automatically switches to low pressure gas to ensure that the diaphragm valve cylinder valve stem rises slowly, thereby effectively reducing the wear of the valve stem sealing ring, reducing valve block impact, and improving the service life of the diaphragm valve cylinder.

[0045] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A PET bottle filling diaphragm valve cylinder control system, characterized in that, It includes a diaphragm valve cylinder (1) and air passages A and B for controlling the diaphragm valve cylinder (1); The air passage A is connected to the upper chamber of the control diaphragm valve cylinder (1); The air passage B is connected to the lower chamber of the control diaphragm valve cylinder (1). The air passage B includes a branch air passage C and a branch air passage D. The air pressure of the branch air passage C is higher than that of the branch air passage D. It also includes a controller (13), wherein each of the gas path A, gas path B, gas branch C and gas branch D is equipped with a valve, and the controller (13) is electrically connected to the valve of each gas path; It also includes a bottle flow detection device (2) for detecting the bottle flow (14) signal, the bottle flow detection device (2) being electrically connected to the controller (13); The gas path A is provided with a third pressure reducing valve (8) and a first valve island (9), and the first valve island (9) is electrically connected to the controller (13); The gas path B is provided with a second valve island (10), which is electrically connected to the controller (13); The gas distribution path C is equipped with a second pressure reducing valve (6) and a second valve (7), and the second valve (7) is electrically connected to the controller (13); The gas distribution path D is equipped with a first pressure reducing valve (4) and a first valve (5), and the first valve (5) is electrically connected to the controller (13).

2. The PET bottle filling diaphragm valve cylinder control system according to claim 1, characterized in that, The air inlets of air passages A and B are equipped with pneumatic dual units (3).

3. The PET bottle filling diaphragm valve cylinder control system according to claim 1, characterized in that, A first solenoid valve (11) is provided between the controller (13) and the second valve (7), and the controller (13) controls the opening and closing of the second valve (7) through the first solenoid valve (11); A second solenoid valve (12) is provided between the controller (13) and the first valve (5), and the controller (13) controls the opening and closing of the first valve (5) through the second solenoid valve (12).

4. A control method for the PET bottle filling diaphragm valve cylinder control system according to any one of claims 1-3, characterized in that, Includes the following steps: Step 1: The bottle flow detection device (2) detects the bottle flow (14) and delivers it to the filling area, where the bottle is inserted into the bottle clamping plate; Step 2: The controller (13) controls the first solenoid valve (11) to open the second valve (7) and at the same time opens the second valve island (10). High pressure gas enters the lower chamber of the diaphragm valve cylinder (1), and the valve stem lifts the bottle quickly to perform the filling action. Step 3: The controller (13) closes the second valve island (10) and opens the first valve island (9) at the same time. Compressed air enters the upper chamber of the diaphragm valve cylinder (1), and the valve rod carries the filled bottle down to the turnover position. Step 4: When the bottle flow detection device (2) does not detect bottle flow (14) for a period of time, the controller (13) controls the first solenoid valve (11) to close the second valve (7), and at the same time controls the second solenoid valve (12) to open the first valve (5), and at the same time opens the second valve island (10). Low-pressure compressed air enters the lower chamber of the diaphragm valve cylinder (1), causing the valve stem to slowly rise. Step 5: Repeat steps 1 through 4.

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