A hydraulic cylinder control system with adjustable displacement speed and intermediate stopping capability

Abstract

This utility model relates to a hydraulic cylinder control system with adjustable displacement speed and intermediate stop capability. It includes a cylinder assembly with a valve group and a controller connected to it. The cylinder assembly includes a cylinder body, a piston rod, and a rear-end rod. A displacement sensor, connected to the rear-end rod via a bracket, is located on the cylinder body side corresponding to the rear-end rod. The displacement sensor and the rear-end rod are connected via a connecting rod. A valve needle is connected to the front end of the piston rod. The displacement sensor obtains the cylinder body's displacement data. The controller adjusts the flow rate of the proportional directional valve and the valve core position based on the cylinder body displacement data to drive the cylinder body to change its displacement speed and achieve intermediate stop of the cylinder movement at any desired position. This allows for differentiated control of the opening and closing of the injection port by valves at different points within the same hot runner system, resulting in smoother injection and venting, and effectively improving the quality of injection molded products.

Description

Technical Field

[0001] This utility model relates to the field of cylinder control technology, and in particular to a hydraulic cylinder control system with adjustable displacement speed and the ability to achieve intermediate stops. Background Technology

[0002] In the field of industrial automation, hydraulic cylinder displacement sensors are core components that ensure the operational accuracy of equipment. By monitoring the linear displacement of the piston rod in real time, they convert mechanical motion into electrical signals, providing crucial data feedback for the control system.

[0003] In the field of injection molding, injection molding machines mainly consist of a hydraulic transmission and electrical control system, an injection unit, and a mold clamping unit. The hydraulic transmission and electrical control system primarily comprises a hydraulic pump, valves, a motor, electrical components, and control instruments. During injection molding, the injection unit fills the mold cavity with molten plastic from the barrel and transmits injection pressure. In existing technology, the injection pressure of injection molding machines is regulated by a pressure regulating valve. Under a set pressure, the pressure difference between the early and late injection stages is controlled by switching on and off high-pressure and low-pressure oil circuits. However, when the plastic enters through the injection port, the injection speed, injection position, and injection time need to be flexibly adjusted according to different product structures. However, pressure regulating valves have the following drawbacks: 1. Difficulty in adjustment: When the regulating valve is fully open or nearly fully open, the flow rate may not reach the expected value, making the regulating valve ineffective. 2. Poor adjustment quality: If the pressure difference accounts for too small a proportion of the total pressure drop in the piping system, the working characteristics of the regulating valve cannot approach the ideal state, resulting in poor adjustment quality and difficulty in process control. Controlling the injection pressure solely through a pressure regulating valve makes it difficult to guarantee the quality of injection-molded products. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic cylinder control system with adjustable displacement speed and intermediate stop capability. It obtains cylinder displacement data through a displacement sensor, and the controller adjusts the flow rate of the proportional directional valve and the valve core position based on this data to drive the cylinder to change its displacement speed and achieve intermediate stop at any desired position. This allows for differentiated control of the opening and closing of the injection port at different points within the same hot runner system, resulting in smoother injection and venting, and effectively improving the quality of injection molded products.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hydraulic cylinder control system with adjustable displacement speed and intermediate stop capability, comprising a cylinder assembly, a valve group and a controller connected to the cylinder assembly, the cylinder assembly including a cylinder body, a piston rod connected inside the cylinder body, a cylinder rear end rod connected to the rear end of the piston rod at the rear end of the cylinder body, the other end of the cylinder rear end rod being located on one side of the cylinder body, a displacement sensor connected to the cylinder rear end rod via a bracket being provided on the same side of the cylinder body, the displacement sensor being connected to the cylinder rear end rod via a connecting rod, and a valve needle connected to the front end of the piston rod.

[0006] Preferably, a guide rail is provided on one side of the cylinder body, and the cylinder rear end rod has a bent structure, with a slider in the middle of the bent cylinder rear end rod that cooperates with and connects to the guide rail.

[0007] More preferably, the front end of the cylinder block is connected to a cylinder cooling water manifold, and the front end of the cylinder cooling water manifold is provided with a heat-insulating support column.

[0008] More preferably, the other side of the cylinder is connected to an oil / air inlet and an oil / air outlet, and the cylinder cooling water circuit board is connected to a water circuit board inlet and a water circuit board outlet on one side.

[0009] More preferably, a protective cover is connected to the outer end of the cylinder body.

[0010] More preferably, the valve assembly includes an integrated base, on which a pressure regulating valve, a pressure gauge, a general solenoid valve, and a proportional directional valve are arranged. One side of the integrated base is provided with a main oil / air inlet and a main oil / air return port, a general solenoid valve oil / air inlet and an general solenoid valve oil / air outlet that are connected in cooperation with the general solenoid valve, and a proportional directional valve oil / air inlet and a proportional directional valve oil / air outlet for connecting the proportional directional valve to the cylinder block's oil / air inlet and outlet ports.

[0011] More preferably, the displacement sensor is connected to the input terminal of the controller, the output terminal of the controller is connected to the proportional directional valve, the proportional directional valve is connected to the cylinder body through an oil / air inlet and an oil / air outlet, and the output terminal of the cylinder body is connected to the input terminal of the displacement sensor.

[0012] The beneficial effects of this utility model are as follows: It includes a cylinder assembly, on which a valve group and a controller are connected. The cylinder assembly includes a cylinder body, and a piston rod is connected inside the cylinder body. A cylinder rear-end rod connected to the rear end of the piston rod is located at the rear end of the cylinder body. The other end of the cylinder rear-end rod is located on one side of the cylinder body. A displacement sensor, connected to the cylinder rear-end rod via a bracket, is located on this side of the cylinder body corresponding to the cylinder rear-end rod. The displacement sensor and the cylinder rear-end rod are connected via a connecting rod. A valve needle is connected to the front end of the piston rod. The displacement data of the cylinder body is obtained through the displacement sensor. The controller adjusts the flow rate of the proportional directional valve and the position switching of the proportional valve core based on the cylinder displacement data to drive the cylinder to achieve changes in displacement speed and to stop the cylinder movement at any desired position. This allows for differentiated control of the opening and closing of the injection port by valves at different points within the same hot runner system, resulting in smoother injection and venting, thereby effectively improving the quality of injection molded products. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is an exploded structural diagram of the present invention.

[0015] Figure 3 This is the control principle diagram of this utility model. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0017] like Figure 1-3 As shown, a hydraulic cylinder control system with adjustable displacement speed and intermediate stop capability includes a cylinder body assembly 1. A valve group 2 and a controller 3 are connected to the cylinder body assembly 1. The cylinder body assembly 1 includes a cylinder body 11, within which a piston rod is connected. A cylinder rear end rod 12, connected to the rear end of the piston rod, is located at the rear end of the cylinder body 11. The other end of the cylinder rear end rod 12 is located on one side of the cylinder body 11. A displacement sensor 13, connected via a bracket, is located on this side of the cylinder body 11 corresponding to the cylinder rear end rod 12. The displacement sensor 13 and the cylinder rear end rod 12 are connected via a connection... The piston rod 14 is connected to a valve needle 15 at its front end. The displacement data of the cylinder 11 is obtained through the displacement sensor 13. The controller 3 adjusts the flow rate of the proportional directional valve 25 and the valve core position of the directional valve 25 according to the displacement data of the cylinder 11, thereby driving the cylinder 11 to change its displacement speed and stop the movement of the cylinder 11 at any required position. This allows for differentiated control of the opening and closing of the injection port by the valve needle 15 at different points in the same hot runner system, making the injection and venting smoother and effectively improving the quality of injection molded products.

[0018] In this embodiment, a guide rail 16 is provided on one side of the cylinder body 11, and the cylinder rear end rod 12 is a bent structure. The middle of the bent cylinder rear end rod 12 is provided with a slider 17 that is connected to the guide rail 16. Through the cooperation between the slider 17 and the guide rail 16, the cylinder rear end rod 12 can move smoothly, thereby making the displacement sensor 13 sensitive and accurate in sensing the displacement of the cylinder rear end rod 12.

[0019] In this embodiment, a cylinder cooling water manifold 18 is connected to the front end of the cylinder body 11. The front end of the cylinder cooling water manifold 18 is provided with a heat insulation support column 19. An oil / gas inlet 111 and an oil / gas outlet 112 are connected to the other side of the cylinder body 11. A water inlet 113 and a water outlet 114 are connected to one side of the cylinder cooling water manifold 18. The cylinder body 11 can be cooled by the cylinder cooling water manifold 18 to ensure its working efficiency and quality. The cylinder cooling water manifold 18 can be connected to the controller 3. A protective cover 110 is connected to the outer end of the cylinder body 11 to protect the transmission between the cylinder body 11 and the piston rod.

[0020] In this embodiment, the valve group 2 includes an integrated base 21. The integrated base 21 is provided with a pressure regulating valve 22, a pressure gauge 23, a general solenoid valve 24, and a proportional directional valve 25. One side of the integrated base 21 is provided with a main oil / air inlet 26 and a main oil / air return port 27, a general solenoid valve inlet / air port 28 and a general solenoid valve outlet / air port 29 that are connected to the general solenoid valve 24, and a proportional directional valve inlet / air port 210 and a proportional directional valve outlet / air port 211 for connecting the proportional directional valve 25 to the cylinder body 11 via an oil / air inlet port 111 and an oil / air outlet port 112. The pressure regulating valve 22 is used to control and stabilize the pressure in the cylinder body 11 to ensure that the fluid flows within a set range. The proportional directional valve 25 is controlled by the controller 3 to switch directions and control the flow rate, thereby realizing the change of displacement speed of the cylinder body 11.

[0021] In this embodiment, the displacement sensor 13 is connected to the input terminal of the controller 3, and the output terminal of the controller 3 is connected to the proportional directional valve 25. The proportional directional valve 25 is connected to the cylinder 11 through an oil / air inlet and an oil / air outlet. The output terminal of the cylinder 11 is connected to the input terminal of the displacement sensor 13. In specific control, the parameters of the controller 3 are first set to determine the stop position and segmented displacement speed of the cylinder 11. The displacement sensor 13 senses the real-time displacement signal of the cylinder 11 and sends it to the controller 3. The controller 3 then sends a signal to the proportional directional valve 25. The proportional directional valve 25 is controlled by the controller 3 to switch and control the flow rate. Switching causes the piston rod of the cylinder 11 to extend, retract, and stop. Controlling the flow rate changes the displacement speed of the cylinder 11, thereby enabling the valve needle 15 to open (adjust the injection size) and close the injection port simultaneously, thus effectively improving the quality of the injection molded product.

[0022] Based on the concept of this utility model, there may be changes in the specific implementation methods and application scope. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A hydraulic cylinder control system with adjustable displacement speed and intermediate stopping capability, characterized in that: The system includes a cylinder assembly, on which a valve group and a controller are connected. The cylinder assembly includes a cylinder body, and a piston rod is connected inside the cylinder body. A cylinder rear end rod is provided at the rear end of the cylinder body and connected to the rear end of the piston rod. The other end of the cylinder rear end rod is located on one side of the cylinder body. A displacement sensor is provided on this side of the cylinder body corresponding to the cylinder rear end rod and connected to it via a bracket. The displacement sensor is connected to the cylinder rear end rod via a connecting rod. A valve needle is connected to the front end of the piston rod.

2. The hydraulic cylinder control system with adjustable displacement speed and intermediate stop capability according to claim 1, characterized in that: The cylinder body is provided with a guide rail on one side, and the cylinder rear end rod is a bent structure. The middle of the bent cylinder rear end rod is provided with a slider that cooperates with and connects to the guide rail.

3. The hydraulic cylinder control system for adjustable displacement speed and intermediate stopping according to claim 1, characterized in that: The cylinder block is connected to a cylinder cooling water manifold at the front end, and the cylinder cooling water manifold is provided with a heat insulation support column at the front end.

4. A hydraulic cylinder control system for adjustable displacement speed and intermediate stopping according to claim 3, characterized in that: The cylinder body is connected to an oil / air inlet and an oil / air outlet on the other side, and the cylinder cooling water circuit board is connected to a water circuit board inlet and a water circuit board outlet on one side.

5. A hydraulic cylinder control system for adjustable displacement speed and intermediate stopping according to claim 1, characterized in that: A protective cover is connected to the outer end of the cylinder.

6. A hydraulic cylinder control system for adjustable displacement speed and intermediate stopping according to claim 4, characterized in that: The valve assembly includes an integrated base, on which a pressure regulating valve, a pressure gauge, a general solenoid valve, and a proportional directional valve are arranged. One side of the integrated base is provided with a main oil / air inlet and a main oil / air return port, a general solenoid valve oil / air inlet and an general solenoid valve oil / air outlet that are connected in conjunction with the general solenoid valve, and a proportional directional valve oil / air inlet and a proportional directional valve oil / air outlet for connecting the proportional directional valve to the cylinder block's oil / air inlet and oil / air outlet.

7. A hydraulic cylinder control system for adjustable displacement speed and intermediate stopping according to claim 6, characterized in that: The displacement sensor is connected to the input terminal of the controller, the output terminal of the controller is connected to the proportional directional valve, the proportional directional valve is connected to the cylinder body through an oil / air inlet and an oil / air outlet, and the output terminal of the cylinder body is connected to the input terminal of the displacement sensor.

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