A rapid mold closing system

Abstract

This invention discloses a rapid mold closing system, comprising a fixed plate and a movable plate mounted on a machine base, an injection cylinder including an injection screw, an ejection cylinder for ejecting the product located behind the movable plate, and a double-acting cylinder for driving the movable plate to move. A return oil pipeline is provided between the two working chambers of the double-acting cylinder. This invention ensures a large flow rate of hydraulic oil required for mold closing / parting, ensuring stable operation of the injection molding machine, thereby increasing the mold closing and parting speeds of the injection molding machine and ultimately improving production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding equipment manufacturing, in particular to a rapid mold clamping system. BACKGROUND

[0002] At present, the parts and products of injection molding are more and more, accordingly, the demand for injection molding equipment (injection molding machine) is also more and more. In the injection molding machine, the most common is horizontal injection molding machine, which mainly includes a machine table, a fixed plate and a movable plate arranged at intervals on the machine table, a sliding rod is arranged between the fixed plate and the movable plate, the fixed plate is fixedly arranged and is used for fixing the fixed mold part of the mold, the movable plate is movable along the sliding rod relative to the fixed plate and is used for fixing the movable mold part of the mold, so as to form a mold clamping part between the fixed plate and the movable plate. In addition, an injection cylinder including an injection screw is arranged on the machine table in front of the fixed plate, and an ejection cylinder for ejecting the product is arranged behind the movable plate. When the molten plastic in the injection cylinder enters the mold cavity under the drive of the injection screw and cools and forms after the injection screw is driven, the movable plate is driven to move backward by the hydraulic cylinder, so as to realize the mold opening of the movable mold part and the fixed mold part, at this time, the product stays in the movable mold part, then the ejection mechanism of the mold is driven by the ejection cylinder to move, so that the top rod of the mold ejects the formed product away from the movable mold part, thereby completing the molding of the product. Since the structure and the corresponding working principle of the above-mentioned injection molding equipment belong to the prior art, further description is not expanded here.

[0003] The existing injection molding machine still has the following technical defects: first, because a large driving force is needed during mold opening and mold clamping, the hydraulic cylinder for mold clamping / mold opening needs to have a large hydraulic oil flow, and if the oil supply is strictly relied on the traveling tank, the oil supply speed will be difficult to meet the requirements, especially for the rapid mold opening / closing injection molding machine, the above-mentioned problems will be more prominent; secondly, because the mold clamping and mold opening are only relied on the movement of the movable plate, that is, the fixed plate for installing the fixed mold part is fixedly arranged on the machine table to avoid relative movement with the injection cylinder. Therefore, the mold opening and mold clamping speed of the injection molding machine will be limited, especially when the product has a long size, the mold opening and mold clamping speed will be difficult to meet the requirements, thereby affecting the molding efficiency and the production efficiency of the product. If the oil inlet and outlet speed of the hydraulic cylinder is simply improved, the mold opening and mold clamping speed can also be improved, when the mold clamping force of the injection molding machine is large, the cross-sectional area of the hydraulic cylinder is large, which will cause the mold opening and mold clamping speed to be unstable, especially, it will cause a large impact due to sudden stop. It is not conducive to the stable operation of the injection molding machine. SUMMARY

[0004] The first object of the present application is to provide a quick clamping system, which can ensure the required high flow of hydraulic oil during clamping and unclamping, thereby improving the clamping and unclamping speed of the injection molding machine and further improving the production efficiency.

[0005] The second object of the present application is to provide a quick clamping system, which can effectively improve the relative moving speed of the movable plate and the fixed plate of the injection molding machine, thereby improving the clamping and unclamping speed and further improving the production efficiency, on the basis of ensuring the smooth operation of the injection molding machine.

[0006] In order to achieve the above objects, the present application adopts the following technical solutions:

[0007] A quick clamping system, which comprises a fixed plate and a movable plate arranged on a machine table, an injection cylinder comprising an injection screw, an ejection cylinder arranged behind the movable plate for ejecting products, and a double-acting cylinder for driving the movable plate to move, wherein an oil return pipeline is arranged between the two working chambers of the double-acting cylinder.

[0008] Firstly, the present application comprises a fixed plate for mounting the fixed mold part, a movable plate for mounting the movable mold part, and an injection cylinder comprising an injection screw. Secondly, the present application comprises a double-acting cylinder for driving the movable plate to move. It can be understood that the double-acting cylinder can drive the movable plate to move freely in two directions, thereby achieving clamping and unclamping.

[0009] In particular, an oil return pipeline is arranged between the two working chambers of the double-acting cylinder. In this way, when high-pressure hydraulic oil is injected into the first working chamber to achieve the clamping action, the hydraulic oil in the second working chamber in a low-pressure state is squeezed out and quickly returns to the first working chamber through the oil return pipeline. Similarly, when unclamping, high-pressure hydraulic oil is injected into the second working chamber, at this time, the hydraulic oil in the first working chamber in a low-pressure state is squeezed out and quickly returns to the second working chamber through the oil return pipeline. That is, the high-pressure hydraulic oil in the working chamber does not come entirely from its inherent hydraulic oil tank, but mainly from the return of the first and second working chambers, and the high-pressure hydraulic oil output by the hydraulic oil tank mainly provides the pressure of the working chamber to drive the rapid movement of the movable plate. On the basis of ensuring the required high flow of hydraulic oil during clamping and unclamping, the clamping and unclamping speed of the injection molding machine is improved, and further the production efficiency is improved.

[0010] As a preferred embodiment, an electric screw is further arranged on the machine table to drive the fixed plate to move. During clamping or unclamping, the double-acting cylinder drives the movable plate to move, and the electric screw drives the fixed plate to move towards or away from the movable plate.

[0011] Since the machine table is also provided with the electric screw rod capable of driving the fixed plate to move, that is, the fixed plate can be electrically driven through the electric screw rod, and the fixed plate can be hydraulically driven through the double-acting oil cylinder, so that the electric and hydraulic driving double working modes of the mold closing and mold opening can be realized, thereby effectively improving the relative moving speed of the movable plate and the fixed plate of the injection molding machine, and then improving the mold closing and mold opening speed, and further improving the production efficiency.

[0012] As preferred, the machine table is provided with the base plate in front of the fixed plate, the fixed plate and the base plate are connected into one through the cylinder sleeve, the movable plate and the starting end of the piston rod are fixedly connected, the piston rod is provided with the piston in the cylinder sleeve at the terminal end, the piston divides the mold closing cavity close to the starting end and the mold opening cavity close to the terminal end in the cylinder sleeve, the fixed plate is provided with the perforation allowing the piston rod to pass through, and the fixed plate and the movable plate are close to each other when the mold closing cavity is filled with oil.

[0013] The machine table is provided with the base plate in front of the fixed plate, and the fixed plate and the base plate are connected into one through the cylinder sleeve. That is, the distance between the fixed plate and the base plate is moderately kept unchanged, and the cylinder sleeve, the piston and the piston rod can play a role similar to the hydraulic oil cylinder. In this way, the fixed plate and the base plate can be electrically driven through the electric screw rod, and when the double-acting oil cylinder is started, the fixed plate and the base plate can remain stationary relative to the movable plate, thereby driving the movable plate to move, and further realizing the mold closing and mold opening with large thrust.

[0014] As preferred, the fixed plate and the base plate are connected into one through the cylinder sleeve arranged at the four corners, wherein the mold closing cavities of the two upper and lower cylinder sleeves on the same side are connected in communication through the mold closing oil inlet pipeline, and the mold opening cavities of the two upper and lower cylinder sleeves on the same side are connected in communication through the mold opening oil inlet pipeline.

[0015] The hydraulic system composed of the cylinder sleeves arranged at the four corners is similar to the existing four slide rods, which is beneficial to the balance of the mold closing force and the mold opening force between the movable plate and the fixed plate. Since the mold closing cavities of the two upper and lower cylinder sleeves on the same side are connected in communication through the mold closing oil inlet pipeline, and the mold opening cavities of the two upper and lower cylinder sleeves on the same side are connected in communication through the mold opening oil inlet pipeline, it is not only beneficial to the consistency of the hydraulic pressure, but also beneficial to the large flow of the hydraulic oil in and out.

[0016] As preferred, at least one of the piston rods on one side is provided with the axial oil inlet blind hole extending from the starting end to the terminal end, and the radial oil inlet hole connecting the axial oil inlet blind hole and the mold opening cavity.

[0017] That is, the axial oil inlet blind hole and the radial oil inlet hole of the piston rod can play a role of the oil inlet pipeline, which can not only simplify the structure, but also improve the strength of the oil inlet pipeline.

[0018] As preferred, the injection cylinder is arranged between the base plate and the fixed plate. Thus, the fixed gap between the base plate and the fixed plate can be fully utilized, and the injection cylinder can move synchronously with the base plate and the fixed plate.

[0019] As preferred, the fixed plate and the base plate are movably arranged on the machine table, the base plate is provided with a screw nut, and an electric screw rod is connected to the machine table at one end and threadedly connected to the screw nut at the other end.

[0020] When the electric screw rod rotates, the base plate and the fixed plate can be driven to move synchronously through the screw nut arranged on the base plate. In particular, the fixed plate is provided with a fixed mold part of a mold, and when the mold is closed, the base plate on the front side of the fixed plate and the cylinder sleeve can reliably support the fixed plate, avoiding lateral tilting of the fixed plate.

[0021] Therefore, the present application has the following beneficial effects: the required hydraulic oil flow during mold closing and mold opening can be ensured, the smooth operation of the injection molding machine can be ensured, the mold closing and mold opening speed of the injection molding machine is improved, and the production efficiency is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of an injection molding machine using the rapid mold closing system of the present application.

[0023] Figure 2 is a structural schematic view of a double-acting oil cylinder.

[0024] In the figure: 1, fixed plate 2, movable plate 21, ejection oil cylinder 3, injection cylinder 5, double-acting oil cylinder 51, cylinder sleeve 52, piston rod 53, piston 54, mold closing cavity 55, mold opening cavity 6, electric screw rod 7, base plate 8, machine table. DETAILED DESCRIPTION

[0025] The present application will be further described below in combination with the drawings and specific embodiments.

[0026] [As Figure 1 , Figure 2 shown, a rapid mold closing system is suitable for an injection molding machine, specifically including a fixed plate 1 and a movable plate 2 arranged on a horizontal machine table 8, an injection cylinder 3 including an injection screw, and an ejection oil cylinder 21 arranged behind the movable plate for ejecting products. The above technical features are general technical features of existing injection molding machines, and as a person skilled in the art, the basic structure and purpose of the above technical features should be known, so the present embodiment will not be described in detail.

[0027] In addition, the present application also comprises a double-acting oil cylinder 5 for driving the movable plate to move. It can be understood that the double-acting oil cylinder has two working chambers, i.e. a first working chamber and a second working chamber, so as to drive the movable plate to move back and then realize the mold closing and mold opening. Of course, a hydraulic oil tank for storing hydraulic oil and an oil motor for outputting high-pressure hydraulic oil are also needed. In particular, a return oil pipeline (not shown in the figure) is arranged between the two working chambers of the double-acting oil cylinder. In this way, when high-pressure hydraulic oil is injected into the first working chamber to realize the mold closing, the hydraulic oil in the second working chamber in a low-pressure state is squeezed out and quickly returns to the first working chamber through the return oil pipeline. Similarly, when the mold opening, high-pressure hydraulic oil is injected into the second working chamber, at this time, the hydraulic oil in the first working chamber in a low-pressure state is squeezed out and quickly returns to the second working chamber through the return oil pipeline. That is to say, the high-pressure hydraulic oil in the working chamber does not come from the hydraulic oil output by the oil motor, but mainly comes from the return of the first and second working chambers, greatly reducing the amount of hydraulic oil output by the oil motor. The high-pressure hydraulic oil output by the oil motor through the oil motor mainly provides the pressure of the working chamber. On the basis of ensuring the large-flow hydraulic oil required during mold closing / opening, the smooth mold closing / opening of the injection molding machine can be realized, and the production efficiency can be improved.

[0028] As a preferred solution, a horizontal electric screw rod 6 for driving the fixed plate to move is also arranged on the machine. In this way, when the injection molding machine is closed or opened, on the one hand, the double-acting oil cylinder acts to drive the movable plate to move; on the other hand, the electric screw rod drives the fixed plate to move towards or away from the movable plate, so as to realize the electric and hydraulic driving double working mode of mold closing and mold opening, and then effectively improve the relative moving speed of the movable plate and the fixed plate of the injection molding machine, improve the mold closing and mold opening speed, and improve the production efficiency.

[0029] As another preferred solution, a base plate 7 in front of the fixed plate can be vertically arranged on the machine, that is, the electric screw rod can drive the fixed plate to move together with the base plate. Of course, the base plate can be arranged in parallel with the fixed plate. In addition, the fixed plate and the base plate are connected into one body through a cylinder sleeve 51, the movable plate is fixedly connected to the starting end of a piston rod 52, the terminal end of the piston rod is provided with a piston 53 located in the cylinder sleeve, the piston divides the cylinder sleeve into a mold closing chamber 54 close to the starting end and a mold opening chamber 55 close to the terminal end, and the fixed plate is provided with a through hole allowing the piston rod to pass through. When the high-pressure hydraulic oil output by the oil motor fills the mold closing chamber, the movable plate moves towards the fixed plate, and at the same time, the electric screw rod drives the fixed plate and the base plate to move towards the movable plate, so as to make the fixed plate and the movable plate close to each other to realize the mold closing. Conversely, when the mold opening chamber is filled with oil, the movable plate moves away from the fixed plate, and the electric screw rod drives the fixed plate and the base plate to move away from the movable plate, so as to make the fixed plate and the movable plate move away from each other to realize the mold opening.

[0030] It should be noted that, whether the mold is closed or opened, the electric screw rod only plays a role in driving the fixed plate to move, and the double-acting oil cylinder actually plays a role in providing the mold closing force and the mold opening force. Since the fixed plate is installed with the fixed mold part of the mold, the base plate on the front side of the fixed plate and the cylinder sleeve can provide reliable support for the fixed plate, avoiding lateral tilting of the fixed plate due to stress.

[0031] Further, we can set 4 cylinder sleeves at the corners between the fixed plate and the base plate, of course, the 4 cylinder sleeves need to be configured with corresponding piston rods and pistons to facilitate the balance of the mold closing force and the mold opening force between the movable plate and the fixed plate. The mold closing cavities of the two upper and lower cylinder sleeves on the same side are connected through the mold closing oil inlet pipeline, and the mold opening cavities of the two upper and lower cylinder sleeves on the same side are connected through the mold opening oil inlet pipeline, which is conducive to achieving balanced and consistent hydraulic pressure during mold closing / mold opening, and can also improve the mold closing / mold opening speed.

[0032] Further, at least one of the piston rods on one side is provided with an axial oil inlet blind hole (not shown in the figure) extending from the starting end to the terminal end, and a radial oil inlet hole (not shown in the figure) connecting the axial oil inlet blind hole and the mold opening cavity. The starting end of the axial oil inlet blind hole is connected with the output end of the oil motor. In this way, the axial oil inlet blind hole and the radial oil inlet hole can play a role similar to the oil inlet pipeline, thereby simplifying the structure and improving the strength of the oil inlet pipeline.

[0033] In addition, the injection cylinder can be arranged in the gap between the base plate and the fixed plate, so that the injection cylinder can move synchronously with the base plate and the fixed plate.

[0034] In addition, the fixed plate and the base plate are movably arranged on the machine table, and the base plate is provided with a screw nut (not shown in the figure) near the lower part of the machine table. One end of the electric screw rod is connected to the machine table, and the other end is threadedly connected with the screw nut.

[0035] In this way, when the electric screw rod rotates, the base plate and the fixed plate can be driven to move synchronously through the screw nut arranged on the base plate.

Claims

1. A quick mold clamping system comprising a fixed plate and a movable plate provided on a machine table, an injection cylinder comprising an injection screw, an ejection cylinder for ejecting a product provided behind the movable plate, characterized in that, The double-acting oil cylinder for driving the movable plate to move is provided with an oil return pipeline between two working cavities of the double-acting oil cylinder; The fixed plate and the base plate are connected into an integral whole through the cylinder sleeves arranged at four corners, wherein the mold closing cavities of the two upper and lower cylinder sleeves on the same side are connected in communication through a mold closing oil inlet pipeline, and the mold opening cavities of the two upper and lower cylinder sleeves on the same side are connected in communication through a mold opening oil inlet pipeline.

2. The quick clamp system of claim 1, wherein, The machine table is further provided with an electric screw rod for driving the fixed plate to move, and when the mold is closed or opened, the double-acting oil cylinder drives the movable plate to move, and the electric screw rod drives the fixed plate to move towards or away from the movable plate.

3. The quick die clamp system of claim 2 wherein, The machine table is provided with a base plate in front of the fixed plate, the fixed plate and the base plate are connected into an integral whole through the cylinder sleeves, the movable plate is fixedly connected with the starting end of the piston rod, and the piston is arranged in the cylinder sleeve at the terminal end of the piston rod.

4. The quick die clamp system of claim 3 wherein, The piston divides the cylinder sleeve into a mold closing cavity close to the starting end and a mold opening cavity close to the terminal end, the fixed plate is provided with a through hole allowing the piston rod to pass through, the fixed plate and the movable plate are close to each other when the mold closing cavity is filled with oil, and the fixed plate and the movable plate are away from each other when the mold opening cavity is filled with oil.

5. The quick die clamp system of claim 3 wherein, At least one of the piston rods on one side is provided with an axial oil inlet blind hole extending from the starting end to the terminal end and a radial oil inlet hole communicating the axial oil inlet blind hole with the mold opening cavity.

6. The quick die clamp system of claim 3 wherein, The injection cylinder is arranged between the base plate and the fixed plate.

7. The quick die clamp system of claim 3 wherein, The fixed plate and the base plate are movably arranged on the machine table, the base plate is provided with a screw rod nut, one end of the electric screw rod is connected to the machine table, and the other end is threadedly connected with the screw rod nut.

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