Oil cylinder structure of injection molding machine
By designing a mutually unconnected oil chamber and oil storage tank linkage system in the injection molding machine cylinder, the problems of large resistance and high cost in the existing injection molding machine cylinder structure are solved, and faster response speed and lower production costs are achieved.
Patent Information
- Application Number
- CN202422122297.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-28
AI Technical Summary
The rubber extraction cylinder structure of the existing injection molding machine causes the rubber injection cylinder to require a larger solenoid valve and greater resistance, which reduces the response speed and increases production costs.
The first and second oil chambers that are not connected to each other are designed, combined with the linkage of the oil storage tank and multiple oil injection cylinders, the control valves can alternate oil circulation and oil discharge, reducing the resistance of hydraulic oil, and use a small inner diameter oil extraction cylinder and a solenoid valve with smaller specifications.
It improves the response speed of the rubber injection cylinder, reduces resistance and impact, extends service life, and reduces production costs.
Smart Images
Figure CN223071886U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of injection molding machine cylinders, and particularly to a cylinder structure of an injection molding machine. Background Art
[0002] Currently, the cylinders of injection molding machines mainly play the role of converting liquid high-pressure oil into mechanical energy, and are responsible for driving each moving part of the injection molding machine, such as mold opening, injection, mold closing, demolding, etc. Among them, the plasticizing cylinder of the injection molding machine is an important part of the injection molding machine, which is mainly involved in plasticizing or reverse screw actions to reduce the pressure at the nozzle after plasticizing and prevent drooling. When the injection molding machine performs a plasticizing action, the corresponding electromagnetic coil of the direction control valve is energized through the solenoid valve, causing the oil in the plasticizing cylinder to flow and change pressure. The flow and pressure change of the oil drive the plasticizing plunger to slide back and forth in the plasticizing cylinder body, thus completing the plasticizing or reverse screw action.
[0003] The plasticizing cylinder is separately arranged, usually externally placed alone below the injection cylinder. Its structure includes a plasticizing cylinder body and a plasticizing plunger. The inside of the plasticizing cylinder body is connected to the inside of the injection cylinder through an oil pipe. When the injection cylinder performs an injection action, the plasticizing cylinder body will pump oil through the oil pipe. As the oil in the injection cylinder is pumped into the plasticizing cylinder body, the plasticizing cylinder body can perform a plasticizing action.
[0004] However, the injection cylinder usually needs to alternately supply and drain oil synchronously at both ends to drive the injection piston to move. This also causes the amount of oil pumped during plasticizing to be the same as the amount of oil entering during injection. Therefore, a solenoid valve with a larger specification needs to be selected. In addition, the resistance received by the injection cylinder during injection is relatively large, reducing the response speed. Summary of the Utility Model
[0005] This application provides a cylinder structure of an injection molding machine, which has the effects of reducing production costs, reducing the resistance received by the injection cylinder during injection, and improving the response speed of the cylinder.
[0006] The cylinder structure of the injection molding machine provided by this application adopts the following technical solutions:
[0007] An oil cylinder structure of an injection molding machine, including an injection cylinder and a plasticizing cylinder. The inside of the injection cylinder is separated by a piston rod into a first oil chamber and a second oil chamber that do not communicate with each other. A first oil hole is opened on the outer side wall of the first oil chamber, and a second oil hole is opened on the outer side wall of the second oil chamber; it also includes an oil storage tank. A drain pipe is connected between the oil storage tank and the second oil hole, and a first oil pipe is connected between the oil storage tank and the first oil hole; a second oil pipe and a third oil pipe for alternately supplying and draining oil are arranged between the plasticizing cylinder and the oil storage tank; control valves for controlling the on-off of the oil circuit are arranged on the first oil pipe, the second oil pipe, and the third oil pipe; the piston rod of the plasticizing cylinder is linked with the piston rod of the injection cylinder, and the inner diameter of the plasticizing cylinder is smaller than the inner diameter of the injection cylinder.
[0008] Preferably, the inner diameter width of the plasticizing cylinder is 5 cm - 10 cm.
[0009] Preferably, the number of injection cylinders is multiple, and the injection cylinders are symmetrically arranged on both sides of the plasticizing cylinder.
[0010] Preferably, the injection cylinders on the same side of the plasticizing cylinder are stacked in sequence in the same direction, and the piston rods of the plasticizing cylinder are parallel to each other.
[0011] Preferably, the first oil pipe connects the first oil holes on each injection cylinder in sequence.
[0012] Preferably, the drain pipe connects the second oil holes on each injection cylinder in sequence.
[0013] In summary, the present application includes at least one of the following beneficial technical effects:
[0014] Through the drain pipe, the hydraulic oil in the second oil chamber can be timely discharged into the oil storage tank, so as to ensure that the second oil chamber remains in an empty state. When injecting, oil is supplied into the first oil hole through the first oil pipe. Since the second oil chamber is in an empty state at this time, the resistance received by the piston rod when moving in the direction close to the second oil chamber can be greatly reduced, further improving the response speed of the piston rod. The reaction force received by the piston rod will also decrease accordingly, thereby reducing the impact on the inner wall of the injection cylinder and improving the service life of the injection cylinder;
[0015] The piston rod of the glue pumping cylinder and the piston rod of the glue injection cylinder are both used to be connected with the injection seat or the oil motor. Therefore, when the glue injection cylinder is performing the glue injection action, the piston rod of the glue pumping cylinder will be linked with the piston rod of the glue injection cylinder oil; the hydraulic oil inside the glue pumping cylinder will be alternately passed and discharged through the second oil pipe and the third oil pipe. Since the inner diameter of the glue pumping cylinder is smaller than the inner diameter of the glue injection cylinder, the amount of oil used to drive the piston rod of the glue pumping cylinder to move will be greatly reduced compared with the oil amount of the glue injection cylinder, so the hydraulic oil resistance encountered by the piston rod of the glue pumping cylinder during sliding will also be reduced accordingly; when the glue pumping cylinder is performing the glue pumping action, the piston rod of the glue pumping cylinder will drive the piston rod of the glue injection cylinder to reset in the direction close to the first oil chamber, so as to achieve the purpose of using a small amount of oil to drive the large amount of oil injection cylinder to reset; reducing the workload of the glue pumping cylinder, there is no need to use a larger electromagnetic valve control, so that a smaller glue pumping cylinder can be used to achieve the glue pumping action, which reduces the production cost to a certain extent.
[0016] Combined with oil circuits and electric circuits, it can meet the needs of various plastic injection molding processes and has a wide range of adaptability. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a partial structural schematic diagram of a single injection cylinder on the same side of an embodiment of the present application;
[0018] Figure 2 It is a partial structural schematic diagram of the same-side multi-shot glue cylinder of an embodiment of the present application;
[0019] Figure 3 It is a schematic cross-sectional diagram of the local structure of an embodiment of the present application.
[0020] Explanation of the reference numerals: 1. Glue injection cylinder; 10. First oil chamber; 11. Second oil chamber; 100. First oil hole; 111. Second oil hole; 2. Glue extraction cylinder; 20. Second oil pipe; 21. Third oil pipe; 3. Oil storage tank; 30. Oil drain pipe; 31. First oil pipe; 4. Control valve. DETAILED DESCRIPTION
[0021] The present application is further described in detail below in conjunction with the accompanying drawings.
[0022] The embodiment of the present application discloses a cylinder structure of an injection molding machine.
[0023] Reference Figure 1 , Figure 2, the oil cylinder structure of the injection molding machine includes an injection cylinder 1 and a plasticizing cylinder 2. The piston rods of both the injection cylinder 1 and the plasticizing cylinder 2 are used for fixedly connecting to the injection seat or the oil motor. The number of injection cylinders 1 on the same side of the plasticizing cylinder 2 can be single or multiple. The piston rod of the plasticizing cylinder 2 and the piston rod of the injection cylinder 1 are synchronously linked. The injection cylinder 1 is used to drive the melt screw into and out of the barrel, while the plasticizing cylinder 2 is used for plasticizing or reverse draw actions to reduce the pressure at the nozzle after melting and prevent drooling.
[0024] As Figure 2 , Figure 3 shown, the inside of the injection cylinder 1 is divided by its own piston rod into a non-communicating first oil chamber 10 and a second oil chamber 11. A first oil hole 100 is opened on the outer side wall of the first oil chamber 10, and a second oil hole 111 is opened on the outer side wall at the bottom of the second oil chamber 11.
[0025] As Figure 2 , Figure 3 shown, it further includes an oil storage tank 3 for storing hydraulic oil. A drain pipe 30 is connected between the oil storage tank 3 and the second oil hole 111, and a first oil pipe 31 is connected between the oil storage tank 3 and the first oil hole 100. The number of injection cylinders 1 is set to be multiple, and the injection cylinders 1 are symmetrically arranged on both sides of the plasticizing cylinder 2. The number of injection cylinders 1 on the same side of the plasticizing cylinder 2 is set to be multiple. In this embodiment, two injection cylinders 1 are set on one side as an example. In another preferred embodiment, the number of injection cylinders 1 on the same side can be set to three. Each injection cylinder 1 on the same side is arranged in sequence and stacked in the same direction, and the piston rods of each injection cylinder 1 are parallel to each other. By setting multiple injection cylinders 1, sufficient large traction force can be provided, and the response speed of the injection action is improved.
[0026] As Figure 2 , Figure 3 shown, the first oil pipe 31 connects the first oil holes 100 on each injection cylinder 1 in sequence, and the drain pipe 30 connects the second oil holes 111 on each injection cylinder 1 in sequence. A control valve 4 for controlling the on-off of the oil circuit is also installed on the first oil pipe 31.
[0027] As Figure 2 , Figure 3 shown, an oil pump connected to the first oil pipe 31 is installed in the oil storage tank 3, and the oil pump is used to control the corresponding oil supply and oil discharge actions of the first oil pipe 31. The first oil pipe 31 connects the first oil holes 100 in sequence, so as to ensure the consistency of the actions of each injection cylinder 1, making the injection action more stable and steady.
[0028] The hydraulic oil in the second oil chamber 11 can be timely discharged into the oil storage tank 3 through the drain pipe 30, so as to ensure that the second oil chamber 11 remains in an empty state. When injecting glue, the control valve 4 is opened, and oil is passed into the first oil hole 100 through the first oil pipe 31. Since the second oil chamber 11 is in an empty state at this time, the resistance received by the piston rod of the injection cylinder 1 when moving in the direction close to the second oil chamber 11 can be greatly reduced, further improving the response speed of the piston rod. The reaction force received by the piston rod during the movement will also be reduced accordingly, reducing the impact on the inner wall of the injection cylinder 1 and improving the service life of the injection cylinder 1.
[0029] As Figure 2 , Figure 3 shown, a second oil pipe 20 and a third oil pipe 21 for alternately passing oil and discharging oil are provided between the glue extraction cylinder 2 and the oil storage tank 3. The principle of passing oil and discharging oil of the second oil pipe 20 and the third oil pipe 21 is the same as the working principle of a traditional oil cylinder, which will not be elaborated here. Control valves 4 for controlling the on-off of the respective oil circuits are also provided on both the second oil pipe 20 and the third oil pipe 21. The inner diameter of the glue extraction cylinder 2 is smaller than the inner diameter of the injection cylinder 1. Specifically, the inner diameter width of the glue extraction cylinder 2 is 5 cm - 10 cm.
[0030] The implementation principle is as follows: Since the piston rods of the glue extraction cylinder 2 and each injection cylinder 1 are all used to be connected and fixed to the injection seat or the oil motor, when the injection cylinder 1 performs the injection action, the piston rod of the glue extraction cylinder 2 will be linked with the piston rod of the injection cylinder 1. The hydraulic oil inside the glue extraction cylinder 2 will alternately pass oil and discharge oil through the second oil pipe 20 and the third oil pipe 21. Since the inner diameter of the glue extraction cylinder 2 is smaller than the inner diameter of the injection cylinder 1, the amount of oil used to drive the movement of the piston rod of the glue extraction cylinder 2 will be greatly reduced compared with the amount of oil in the injection cylinder 1. Therefore, the hydraulic oil resistance received by the piston rod of the glue extraction cylinder 2 during sliding will also be reduced accordingly. When the glue extraction cylinder 2 performs the glue extraction action, the piston rod of the glue extraction cylinder 2 will drive the piston rod of the injection cylinder 1 to move and reset in the direction close to the first oil chamber 10, so as to achieve the purpose of driving the piston rod of the large oil volume injection cylinder 1 to reset by the piston rod of the small oil volume glue extraction cylinder 2. There is no need to use a solenoid valve with a large specification for control, reducing the working load of the glue extraction cylinder 2. In addition, using a glue extraction cylinder 2 with a small specification to achieve the glue extraction action reduces the production cost to a certain extent.
[0031] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.
Claims
1. The oil cylinder structure of an injection molding machine, including an injection cylinder (1) and a plastic sucking cylinder (2), is characterized in that: Inside the injection cylinder (1), a piston rod divides it into a first oil chamber (10) and a second oil chamber (11) that do not communicate with each other. A first oil hole (100) is provided on the outer side wall of the first oil chamber (10), and a second oil hole (111) is provided on the outer side wall of the second oil chamber (11); further included is an oil storage tank (3). A drain pipe (30) is connected between the oil storage tank (3) and the second oil hole (111), and a first oil pipe (31) is connected between the oil storage tank (3) and the first oil hole (100); between the extraction cylinder (2) and the oil storage tank (3), a second oil pipe (20) and a third oil pipe (21) for alternately conducting oil and draining oil are provided; control valves (4) for controlling the on / off of the oil circuit are provided on the first oil pipe (31), the second oil pipe (20), and the third oil pipe (21); the piston rod of the extraction cylinder (2) is linked with the piston rod of the injection cylinder (1), and the inner diameter of the extraction cylinder (2) is smaller than the inner diameter of the injection cylinder (1).
2. The oil cylinder structure of the injection molding machine according to claim 1, wherein: The inner diameter width of the extraction cylinder (2) is 5 cm - 10 cm.
3. The oil cylinder structure of the injection molding machine according to claim 1, characterized in that: The number of the injection cylinders (1) is multiple, and the injection cylinders (1) are symmetrically arranged on both sides of the extraction cylinder (2).
4. The oil cylinder structure of the injection molding machine according to claim 3, characterized in that: The injection cylinders (1) on the same side of the extraction cylinder (2) are stacked in sequence along the same direction, and the piston rods of the extraction cylinders (2) are parallel to each other.
5. The oil cylinder structure of the injection molding machine according to claim 4, characterized in that: The first oil pipe (31) connects the first oil holes (100) on each injection cylinder (1) in sequence.
6. The oil cylinder structure of the injection molding machine according to claim 1, characterized in that: The drain pipe (30) connects the second oil holes (111) on each injection cylinder (1) in sequence.