Foaming machine opening device

Abstract

The utility model belongs to foaming equipment technical field discloses a kind of foaming machine opening mould device, including movable platform, main oil cylinder, auxiliary oil cylinder and energy accumulator, the output rod of main oil cylinder is connected movable platform with the output rod of auxiliary oil cylinder respectively, auxiliary oil cylinder is used to promote movable platform to rise to link up multilayer hot plate closed mould, main oil cylinder is used to provide locking force when hot plate closed mould, energy accumulator and the rod cavity of auxiliary oil cylinder are in fluid communication, energy accumulator is used to absorb and store liquid pressure energy when the rod cavity of auxiliary oil cylinder is filled with pressure, rod cavity compression, and release liquid pressure energy to the rod cavity of auxiliary oil cylinder when the rod cavity of auxiliary oil cylinder is pressure loss.Energy accumulator is used for the utility model to the quick response characteristic and stable pressure supply characteristic, give auxiliary oil cylinder a quick, sustained effort, help movable platform, main oil cylinder, realize ≥1m / s's opening mould speed, so that EVA and other high molecular material micropore rapidly expand, to obtain light, good elasticity, excellent cushioning performance foamed product.

Description

Technical Field

[0001] This utility model relates to the field of foaming equipment technology, and in particular to a foaming machine mold opening device. Background Technology

[0002] EVA foaming technology is a polymer material processing technology widely used in footwear, packaging, sports and other fields. Its core is to form a microporous structure in EVA material through physical or chemical methods, and to open the mold quickly at a speed of ≥1m / s by hydraulic release, so that the micropores expand rapidly, thereby obtaining foamed products with lightweight, good elasticity and excellent cushioning performance.

[0003] The structure of existing foaming machines is as follows Figure 1 As shown, at the moment the foaming machine opens the mold, the auxiliary oil cylinder 1' (mold closing drive cylinder) loses pressure, and the product 2' in the mold cavity is released and expands, thus providing an instantaneous expansion force; under the action of its own weight and the instantaneous expansion force of the product, the movable seat 3' drops rapidly and gradually, and links the hot plates 4' of each layer to realize the mold opening.

[0004] Since the product expansion force can only provide an instantaneous force, the mold opening can only be achieved by inertia and gravity after the product is separated, resulting in a slow and gradually decreasing mold opening speed, which cannot meet the requirement of a mold opening speed of ≥1m / s, thus causing the foaming effect of EVA and other polymer materials to fail to meet the standard. Utility Model Content

[0005] Based on the above problems, the purpose of this utility model is to provide a foaming machine mold opening device that enables fast and stable mold opening speed to meet foaming requirements.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A foaming machine mold opening device includes a movable platform, a main hydraulic cylinder, an auxiliary hydraulic cylinder, and an accumulator. The output rods of the main hydraulic cylinder and the auxiliary hydraulic cylinder are respectively connected to the movable platform. The auxiliary hydraulic cylinder is used to push the movable platform upward to link the multi-layer hot plate mold closing. The main hydraulic cylinder is used to provide mold clamping force when the hot plate mold is closed. The accumulator is fluidly connected to the rod chamber of the auxiliary hydraulic cylinder. The accumulator is used to absorb and store liquid pressure energy when the rodless chamber of the auxiliary hydraulic cylinder is pressurized and the rod chamber is compressed. When the rodless chamber of the auxiliary hydraulic cylinder loses pressure, it releases liquid pressure energy to the rod chamber of the auxiliary hydraulic cylinder, thereby assisting the movable platform to descend rapidly to achieve mold opening.

[0008] As an alternative, a control valve is installed on the connecting pipeline between the accumulator and the rod chamber of the auxiliary cylinder. The control valve is used to adjust the output pressure and flow rate of the accumulator, so that the mold opening speed is adjustable.

[0009] As an alternative, the accumulator can be any one of a spring accumulator, a piston accumulator, or a gas accumulator.

[0010] As an alternative, the pre-charge pressure of the accumulator is adjustable.

[0011] As an alternative, during the mold closing process, the rodless cavity of the auxiliary cylinder is in an active oil-inlet state, while the main cylinder is in a passive oil-suction state; during the mold opening process, the rodless cavity of the auxiliary cylinder is in a passive oil-discharge state, while the main cylinder is in a passive oil-discharge state.

[0012] As an optional solution, the multiple layers of hot plates are connected to each other, and the bottommost hot plate is connected to the moving platform via a synchronization mechanism.

[0013] The beneficial effects of this utility model are:

[0014] The mold opening device of this foaming machine utilizes the rapid response and stable pressure supply characteristics of the accumulator to provide a rapid and continuous force to the auxiliary oil cylinder, which in turn drives the moving table and the main oil cylinder to achieve a mold opening speed of ≥1m / s. This allows the micropores of polymer materials such as EVA to expand rapidly, thereby obtaining foamed products that are lightweight, elastic, and have excellent cushioning performance. Attached Figure Description

[0015] Figure 1 This is a structural diagram of an existing foaming machine;

[0016] Figure 2 This is a schematic diagram of the structure of the foaming machine mold opening device provided in this embodiment of the utility model.

[0017] In the attached image:

[0018] 1' Auxiliary hydraulic cylinder; 2' Product; 3' Movable seat; 4' Hot plate;

[0019] 1. Movable platform; 2. Main hydraulic cylinder; 3. Auxiliary hydraulic cylinder; 4. Accumulator; 5. Control valve; 6. Hot plate; 7. Synchronization mechanism. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "on the upper side," and "over" the second feature include the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature include the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 2 As shown, this utility model provides a foaming machine mold opening device, including a movable platform 1, a main oil cylinder 2, an auxiliary oil cylinder 3, and an accumulator 4. The output rods of the main oil cylinder 2 and the auxiliary oil cylinder 3 are respectively connected to the movable platform 1. The auxiliary oil cylinder 3 is used to push the movable platform 1 upward to link the multi-layer hot plate 6 to close the mold. The main oil cylinder 2 is used to provide the mold-locking force when the hot plate 6 closes the mold. The accumulator 4 is fluidly connected to the rod chamber of the auxiliary oil cylinder 3. The accumulator 4 is used to absorb and store liquid pressure energy when the rodless chamber of the auxiliary oil cylinder 3 is pressurized and the rod chamber is compressed. When the rodless chamber of the auxiliary oil cylinder 3 loses pressure, it releases liquid pressure energy to the rod chamber of the auxiliary oil cylinder 3, thereby assisting the movable platform 1 to descend quickly to realize mold opening.

[0025] Therefore, by utilizing the rapid response and stable pressure supply characteristics of the accumulator 4, a rapid and continuous force is applied to the auxiliary cylinder 3, which in turn drives the movable table 1 and the main cylinder 2 to achieve a mold opening speed of ≥1m / s. This allows the micropores of polymer materials such as EVA to expand rapidly, thereby obtaining lightweight, elastic, and excellent cushioning foam products.

[0026] Optionally, a control valve 5 is provided on the connecting pipeline between the accumulator 4 and the rod chamber of the auxiliary cylinder 3. The control valve 5 is used to adjust the output pressure and flow of the accumulator 4, so that the mold opening speed is adjustable.

[0027] During mold opening, the accumulator 4 releases stored pressurized oil to supply oil to the rod chamber of the auxiliary cylinder 3. This, combined with the equipment's own weight and the instantaneous expansion force of the product, accelerates mold opening and significantly mitigates the decrease in mold opening speed. By adjusting the flow rate and pressure of the pressurized oil supplied to the rod chamber of the auxiliary cylinder 3 using the control valve 5 (such as a throttle valve or proportional valve), the mold opening speed can be precisely controlled. This not only meets the speed requirements of different production processes, but the smooth speed regulation also effectively reduces hydraulic shock and protects the system's piping and sealing elements.

[0028] Optionally, the accumulator 4 is any one of a spring-type accumulator, a piston-type accumulator, or a gas-type accumulator.

[0029] Spring-type accumulators are simple in structure, require no gas filling maintenance, and are suitable for small machines below 10MPa. They are low in cost and have high leakage tolerance. Piston-type accumulators have fast response, high pressure resistance, and are compatible with mineral oil and water glycol, making them suitable for high-rigidity closed-mold applications. Gas-type accumulators have the highest energy storage density per unit volume, can discharge large volumes instantly, meet the requirements of high-speed processes requiring full mold opening within 1 second, and offer excellent maintenance economy. These three types of accumulators cover a full spectrum of low-pressure to high-pressure, low-speed to high-speed, and low-cost to high-performance applications, allowing for selection based on process parameters and improving product market adaptability.

[0030] Furthermore, the pre-charge pressure of the accumulator 4 is adjustable. Without limiting the flow rate, the higher the pre-charge pressure is set, the greater the energy stored in the accumulator 4, the greater the mold opening force supplied to the auxiliary cylinder 3, and the faster the mold opening speed.

[0031] Optionally, the multiple layers of hot plates 6 are connected to each other, and the bottommost hot plate 6 is connected to the movable platform 1 via a synchronization mechanism 7, so that when the movable platform 1 moves up and down, all the hot plates 6 open and close the mold synchronously. The synchronization mechanism 7 here is not a key protection point, and the synchronization function can be achieved by using existing cross linkage components, which will not be described further here.

[0032] Specific action process:

[0033] 1) The rodless chamber of the auxiliary cylinder 3 is in an active oil intake state, and the main cylinder 2 is in a passive oil suction state, pushing the movable table 1 and the multi-layer hot plate 6 to rise until the mold is closed. During the process, the rod chamber of the auxiliary cylinder 3 delivers pressurized oil to the accumulator 4, and the accumulator 4 continuously stores energy.

[0034] 2) Hot plate 6 heats, main oil cylinder 2 maintains pressure, vulcanization timer;

[0035] 3) The rodless chamber of the auxiliary cylinder 3 is in a passive oil discharge state, and the main cylinder 2 is in a passive oil discharge state. Under the combined action of the accumulator 4 releasing pressure oil to the rod chamber of the auxiliary cylinder 3, the weight of the movable table 1 and the hot plate 6, and the instantaneous expansion force of the product, the movable table 1 descends rapidly and without speed decay (or with very small speed decay), thus realizing mold opening.

[0036] In summary, the foaming machine's mold opening device, through the connection between the integrated accumulator 4 and the rod-side chamber of the auxiliary cylinder 3, stores the liquid pressure energy during mold closing and releases it instantly during mold opening. Combined with the equipment's own weight and the product's expansion force, it achieves rapid mold opening, effectively solving the problem of decreasing mold opening speed under existing structures. It not only successfully achieves high-speed mold opening of ≥1m / s, meeting the process requirements for foaming materials such as EVA, but also improves the device's process adaptability through the adjustable control valve 5 and pre-charge pressure. By combining energy recovery with precise control, it enhances the stability and energy efficiency of the overall system while improving mold opening speed and product quality, thus optimizing equipment performance and economic benefits.

[0037] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A foaming machine mold opening device, characterized in that, The system includes a movable platform (1), a main hydraulic cylinder (2), an auxiliary hydraulic cylinder (3), and an accumulator (4). The output rod of the main hydraulic cylinder (2) and the output rod of the auxiliary hydraulic cylinder (3) are respectively connected to the movable platform (1). The auxiliary hydraulic cylinder (3) is used to push the movable platform (1) upward to link the multi-layer hot plate (6) to close the mold. The main hydraulic cylinder (2) is used to provide clamping force when the hot plate (6) closes the mold. The accumulator (4) is fluidly connected to the rod cavity of the auxiliary hydraulic cylinder (3). The accumulator (4) is used to absorb and store liquid pressure energy when the rodless cavity of the auxiliary hydraulic cylinder (3) is pressurized and the rod cavity is compressed. When the rodless cavity of the auxiliary hydraulic cylinder (3) loses pressure, the accumulator releases the liquid pressure energy to the rod cavity of the auxiliary hydraulic cylinder (3), thereby helping the movable platform (1) to descend quickly to open the mold.

2. The foaming machine mold opening device according to claim 1, characterized in that, A control valve (5) is provided on the connecting pipe between the accumulator (4) and the rod chamber of the auxiliary cylinder (3). The control valve (5) is used to adjust the output pressure and flow rate of the accumulator (4) so ​​that the mold opening speed is adjustable.

3. The foaming machine mold opening device according to claim 1, characterized in that, The accumulator (4) is any one of a spring accumulator, a piston accumulator, or a gas accumulator.

4. The foaming machine mold opening device according to claim 1, characterized in that, The pre-charge pressure of the accumulator (4) is adjustable.

5. The foaming machine mold opening device according to claim 1, characterized in that, During the mold closing process, the rodless cavity of the auxiliary cylinder (3) is in an active oil inlet state, and the main cylinder (2) is in a passive oil suction state; during the mold opening process, the rodless cavity of the auxiliary cylinder (3) is in a passive oil discharge state, and the main cylinder (2) is in a passive oil discharge state.

6. The foaming machine mold opening device according to claim 1, characterized in that, The multiple layers of hot plates (6) are connected to each other, and the bottommost hot plate (6) is connected to the movable platform (1) by a synchronization mechanism (7).

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