Supercritical ultrahigh pressure mould pressing foaming hydraulic system

Abstract

The utility model relates to the technical field of foaming equipment, and discloses a supercritical ultrahigh pressure mould pressing foaming hydraulic system which comprises an oil supply pipeline, a main cylinder oil way and a control valve group, a delivery pump is arranged on the oil supply pipeline, an oil inlet of the delivery pump is connected with an oil tank, and the oil supply pipeline is connected with the control valve group; a first oil outlet pipeline, a second oil outlet pipeline, a third oil outlet pipeline, a fourth oil outlet pipeline and a fifth oil outlet pipeline are arranged on the control valve group. According to the supercritical ultrahigh-pressure mould pressing foaming hydraulic system, the valves directly connected with the oil way of the main cylinder are subjected to high-pressure-resistant design, and other control valve groups, delivery pumps and the like only need to be subjected to conventional design, so that the requirements, the cost and the failure rate of parts in the system are greatly reduced; and the requirements of oil supplementation, pressurization, pressure maintaining, pressure relief and rapid mold opening in the ultrahigh-pressure supercritical foaming process are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to foaming equipment technical field especially relates to a supercritical superhigh pressure mould pressing foaming hydraulic system. BACKGROUND

[0002] Supercritical foaming technology is a kind of supercritical fluid (such as supercritical carbon dioxide or nitrogen) as physical foaming agent, by regulating pressure and temperature conditions, make raw materials form uniform and small bubble structure under supercritical state. The specific process is, in the supercritical foaming process, supercritical gas and molten raw materials are fully mixed in the supercritical reaction mold cavity, form single-phase mixed sol, again through the control pressure or temperature in the supercritical reaction mold cavity, make mixed sol experience a rapid depressurization or temperature reduction process, make dissolved supercritical gas precipitate rapidly, form a large number of bubble nucleus;Finally, continue to maintain certain temperature and pressure conditions in the supercritical reaction mold cavity, make the bubble nucleus inside the sol continuously grow and form, thereby obtain the foaming material with required bubble structure and performance.

[0003] Among them, the main cylinder of foaming equipment plays a vital role in the foaming process, the main cylinder pushes the movement of foaming material, makes it reach the required pressure and flow, and injects the foaming material into the mold, ensures the stability and quality of the foaming process.

[0004] In the superhigh pressure supercritical foaming preparation process, the pressure of main cylinder is as high as 40MPa~65MPa, and the matched hydraulic system is required to be high. For the conventional pump control hydraulic system, the hydraulic pipeline bears large pressure, and each pump, valve part also needs to use superhigh pressure parts, and the working process is prone to failure and abnormal situation, the equipment cost and maintenance cost are high, and the safety of superhigh pressure supercritical foaming work is affected. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of supercritical superhigh pressure mould pressing foaming hydraulic system to solve the problems mentioned in the above background art, reduce the high-pressure requirement of most parts of hydraulic system, improve system stability, ensure that foaming work is safely carried out.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A kind of supercritical superhigh pressure mould pressing foaming hydraulic system, including oil supply pipeline, main cylinder oil circuit and control valve group, wherein:

[0008] Oil supply pipeline is provided with delivery pump, and the oil inlet of delivery pump is connected with oil tank, and oil supply pipeline is connected with control valve group;

[0009] Control valve group is provided with first oil outlet pipeline, second oil outlet pipeline, third oil outlet pipeline, fourth oil outlet pipeline and fifth oil outlet pipeline.

[0010] The first oil outlet pipeline is connected to the main cylinder oil circuit, and a first super-high pressure valve, a high-pressure resistant intensifier valve and a second super-high pressure valve are sequentially arranged on the first oil outlet pipeline.

[0011] A high-pressure resistant liquid filling valve is arranged on the main cylinder oil circuit, the high-pressure resistant liquid filling valve is provided with a first hydraulic control port and a liquid inlet port, the second oil outlet pipeline is in communication with the first hydraulic control port, and the liquid inlet port is connected to an oil tank.

[0012] A high-pressure resistant safety valve is arranged on the main cylinder oil circuit, the high-pressure resistant safety valve is provided with a second hydraulic control port and a liquid outlet port, the third oil outlet pipeline is in communication with the second hydraulic control port, and the liquid outlet port is connected to the oil tank.

[0013] A high-pressure resistant rapid mold opening valve is arranged on the main cylinder oil circuit, the high-pressure resistant rapid mold opening valve is provided with a normally closed port and a bypass port, the fourth oil outlet pipeline is in communication with the normally closed port, and the bypass port is connected to the oil tank.

[0014] The fifth oil outlet pipeline is connected to the high-pressure resistant intensifier valve to drive the valve core of the high-pressure resistant intensifier valve.

[0015] As an optional solution, the control valve group is provided with a main oil circuit connected to the oil supply pipeline, a first branch oil circuit connected to the first oil outlet pipeline, a second branch oil circuit connected to the second oil outlet pipeline, a third branch oil circuit connected to the third oil outlet pipeline, a fourth branch oil circuit connected to the fourth oil outlet pipeline, and a fifth branch oil circuit connected to the fifth oil outlet pipeline, and the main oil circuit is provided with a first check valve and a first pressure sensor.

[0016] As an optional solution, the control valve group comprises a first reversing valve, a pressure oil port of the first reversing valve is connected to the main oil circuit, a return oil port of the first reversing valve is connected to the oil tank, and a working oil port of the first reversing valve is connected to the first branch oil circuit.

[0017] As an optional solution, the control valve group comprises a second reversing valve, a pressure oil port of the second reversing valve is connected to the main oil circuit, a return oil port of the second reversing valve is connected to the oil tank, and a working oil port of the second reversing valve is connected to the second branch oil circuit.

[0018] As an optional solution, the control valve group comprises a third reversing valve, a pressure oil port of the third reversing valve is connected to the main oil circuit, a return oil port of the third reversing valve is connected to the oil tank, and a working oil port of the third reversing valve is connected to the third branch oil circuit, and a first high-pressure hydraulic ball valve is arranged on the third oil outlet pipeline.

[0019] As an optional solution, the control valve group comprises a fourth reversing valve, a pressure oil port of the fourth reversing valve is connected to the main oil circuit, a return oil port of the fourth reversing valve is connected to the oil tank, and a working oil port of the fourth reversing valve is connected to the fourth branch oil circuit, and a second check valve and a second pressure sensor are arranged on the fourth branch oil circuit.

[0020] As an alternative, the control valve group comprises a fifth directional valve, a pressure oil port of the fifth directional valve is connected to the main oil circuit, a return oil port of the fifth directional valve is connected to the oil tank, a fifth branch oil circuit is connected to one working oil port of the fifth directional valve, and an electromagnetic ball valve is arranged on the fifth branch oil circuit.

[0021] As an alternative, the second hydraulic control port is further connected to a manual pressure relief circuit, a manual pump is arranged on the manual pressure relief circuit, and a second high-pressure hydraulic ball valve is arranged at an oil outlet of the manual pump.

[0022] As an alternative, a throttle valve is arranged on a connecting pipeline of the liquid outlet and the oil tank.

[0023] As an alternative, a third pressure sensor for measuring the pressure of the main cylinder oil circuit is arranged on the first oil outlet pipeline.

[0024] The utility model discloses beneficial effects:

[0025] The supercritical superhigh pressure mould pressing foaming hydraulic system carries out high pressure resistant design to several valves directly connected with the main cylinder oil circuit, and other control valve groups and delivery pumps only need to carry out conventional design, thereby greatly reducing the requirement, cost and failure rate of parts in the system, and meeting the requirements of oil supplementing, pressure increasing, pressure maintaining, pressure releasing and rapid mold opening in the superhigh pressure supercritical foaming process. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the structure schematic diagram of the supercritical superhigh pressure mould pressing foaming hydraulic system provided by the utility model embodiment.

[0027] In the drawings:

[0028] 1, oil supply pipeline; 2, main cylinder oil circuit; 3, control valve group; 4, delivery pump; 5, first oil outlet pipeline; 6, second oil outlet pipeline; 7, third oil outlet pipeline; 8, fourth oil outlet pipeline; 9, fifth oil outlet pipeline; 10, first superhigh pressure valve; 11, high pressure resistant pressure intensifier valve; 12, second superhigh pressure valve; 13, high pressure resistant liquid filling valve; 14, high pressure resistant safety valve; 15, high pressure resistant rapid mold opening valve; 16, first check valve; 17, first pressure sensor; 18, first directional valve; 19, second directional valve; 20, third directional valve; 21, first high-pressure hydraulic ball valve; 22, fourth directional valve; 23, second check valve; 24, second pressure sensor; 25, fifth directional valve; 26, electromagnetic ball valve; 27, manual pressure relief circuit; 28, manual pump; 29, second high-pressure hydraulic ball valve; 30, throttle valve; 31, third pressure sensor. DETAILED DESCRIPTION

[0029] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely intended to explain the utility model and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0030] In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] In the utility model, unless explicitly defined and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0032] In the description of the embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore cannot be understood as a limitation of the utility model.

[0033] In addition, the terms "first", "second" and the like are only used to distinguish in description and have no special meaning.

[0034] Please refer to Figure 1 As shown in the drawings, the embodiment provides a kind of supercritical superhigh pressure mould pressing foaming hydraulic system, including oil supply pipeline 1, main cylinder oil circuit 2 and control valve group 3, wherein:

[0035] Oil supply pipeline 1 is provided with delivery pump 4, and the oil inlet of delivery pump 4 is connected to oil tank, and oil supply pipeline 1 is connected to control valve group 3;

[0036] First oil outlet pipeline 5, second oil outlet pipeline 6, third oil outlet pipeline 7, fourth oil outlet pipeline 8 and fifth oil outlet pipeline 9 are arranged on control valve group 3.

[0037] The first oil outlet pipeline 5 is connected to the main cylinder oil circuit 2, and the first super-high pressure valve 10, the high-pressure booster valve 11 and the second super-high pressure valve 12 are sequentially arranged on the first oil outlet pipeline 5.

[0038] The main cylinder oil circuit 2 is provided with a high-pressure filling valve 13, the high-pressure filling valve 13 is provided with a first hydraulic control port and a liquid inlet port, the second oil outlet pipeline 6 is in communication with the first hydraulic control port, and the liquid inlet port is connected to an oil tank.

[0039] The main cylinder oil circuit 2 is provided with a high-pressure safety valve 14, the high-pressure safety valve 14 is provided with a second hydraulic control port and a liquid outlet port, the third oil outlet pipeline 7 is in communication with the second hydraulic control port, and the liquid outlet port is connected to the oil tank.

[0040] The main cylinder oil circuit 2 is provided with a high-pressure rapid mold opening valve 15, the high-pressure rapid mold opening valve 15 is provided with a normally closed port and a bypass port, the fourth oil outlet pipeline 8 is in communication with the normally closed port, and the bypass port is connected to the oil tank.

[0041] The fifth oil outlet pipeline 9 is connected to the high-pressure booster valve 11 to drive the valve core of the high-pressure booster valve 11.

[0042] Therefore, the first super-high pressure valve 10, the high-pressure booster valve 11, the second super-high pressure valve 12, the high-pressure filling valve 13, the high-pressure safety valve 14 and the high-pressure rapid mold opening valve 15 directly connected to the main cylinder oil circuit 2 are designed to be high-pressure (≥40MPa), and other control valve groups 3 and delivery pumps 4 only need to be designed normally (≤25MPa), thereby greatly reducing the requirements, cost and failure rate of parts in the system, and meeting the requirements of oil supplementing, pressure boosting, pressure maintaining, pressure relief and rapid mold opening in the super-high pressure supercritical foaming process.

[0043] Optionally, the control valve group 3 is provided with a main oil circuit connected to the oil supply pipeline 1, a first branch oil circuit connected to the first oil outlet pipeline 5, a second branch oil circuit connected to the second oil outlet pipeline 6, a third branch oil circuit connected to the third oil outlet pipeline 7, a fourth branch oil circuit connected to the fourth oil outlet pipeline 8, and a fifth branch oil circuit connected to the fifth oil outlet pipeline 9, and the main oil circuit is provided with a first one-way valve 16 and a first pressure sensor 17.

[0044] The first one-way valve 16 ensures one-way output of the oil supply pipeline 1, and the first pressure sensor 17 detects the delivery pressure to ensure normal delivery of pressure oil in the oil supply pipeline 1.

[0045] Optionally, the control valve group 3 comprises a first reversing valve 18, a pressure oil port of the first reversing valve 18 is connected to the main oil circuit, a return oil port of the first reversing valve 18 is connected to the oil tank, and the first branch oil circuit is connected to one working oil port of the first reversing valve 18.

[0046] Thus, the pressure oil is selectively delivered to the main cylinder oil way 2 through the oil supply pipe 1, the main oil way, the first reversing valve 18, the first branch oil way and the first oil outlet pipe 5, and the pressure oil is pressurized by the pressure booster valve, so that the pressure in the main cylinder oil way 2 is stable, and the functions of pressurization and pressure maintenance are realized.

[0047] Optionally, the control valve group 3 comprises a second reversing valve 19, the pressure oil port of the second reversing valve 19 is connected with the main oil way, the oil return port of the second reversing valve 19 is connected with the oil tank, and the second branch oil way is connected with one working oil port of the second reversing valve 19.

[0048] Thus, the pressure oil is selectively supplied to the first hydraulic control port of the high-pressure liquid-filled valve 13 through the oil supply pipe 1, the main oil way, the second reversing valve 19, the second branch oil way and the second oil outlet pipe 6, so as to control the opening or closing of the liquid inlet port of the high-pressure liquid-filled valve 13, and the main cylinder oil way 2 is supplemented with oil in a passive oil absorption mode.

[0049] Optionally, the control valve group 3 comprises a third reversing valve 20, the pressure oil port of the third reversing valve 20 is connected with the main oil way, the oil return port of the third reversing valve 20 is connected with the oil tank, the third branch oil way is connected with one working oil port of the third reversing valve 20, and the third oil outlet pipe 7 is provided with a first high-pressure hydraulic ball valve 21.

[0050] Thus, the pressure oil is selectively supplied to the second hydraulic control port of the high-pressure safety valve 14 through the oil supply pipe 1, the main oil way, the third reversing valve 20, the third branch oil way and the third oil outlet pipe 7, so as to control the opening or closing of the liquid outlet port of the high-pressure safety valve 14, and the main cylinder oil way 2 is helped to release pressure as needed.

[0051] Optionally, the control valve group 3 comprises a fourth reversing valve 22, the pressure oil port of the fourth reversing valve 22 is connected with the main oil way, the oil return port of the fourth reversing valve 22 is connected with the oil tank, the fourth branch oil way is connected with one working oil port of the fourth reversing valve 22, and the fourth branch oil way is provided with a second one-way valve 23 and a second pressure sensor 24.

[0052] Thus, the pressure oil is selectively supplied to the normally closed port of the high-pressure rapid mold opening valve 15 through the oil supply pipe 1, the main oil way, the fourth reversing valve 22, the fourth branch oil way and the fourth oil outlet pipe 8, when the fourth reversing valve 22 is switched and the normally closed port is opened, part of the hydraulic oil in the main cylinder oil way 2 flows to the oil tank through the bypass port, and the other part flows back to the oil tank through the fourth oil outlet pipe 8, so as to realize rapid mold opening.

[0053] Optionally, the control valve group 3 comprises a fifth reversing valve 25, the pressure oil port of the fifth reversing valve 25 is connected with the main oil way, the oil return port of the fifth reversing valve 25 is connected with the oil tank, the fifth branch oil way is connected with one working oil port of the fifth reversing valve 25, and the fifth branch oil way is provided with an electromagnetic ball valve 26.

[0054] Therefore, the high-pressure resistant intensifier valve 11 is selectively supplied with oil through the oil supply pipeline 1, the main oil circuit, the fifth reversing valve 25, the fifth branch oil circuit and the fifth oil outlet pipeline 9, the fifth reversing valve 25 is alternately switched in cooperation with the first reversing valve 18, the valve core of the high-pressure resistant intensifier valve 11 is reciprocally moved, and thus the main cylinder oil circuit 2 is pressurized.

[0055] Optionally, the second hydraulic control port is further connected with a manual pressure relief pipeline 27, the manual pressure relief pipeline 27 is provided with a manual pump 28, and the oil outlet of the manual pump 28 is provided with a second high-pressure hydraulic ball valve 29.

[0056] Therefore, the opening pressure of the outlet of the high-pressure resistant safety valve 14 is provided through the manual pump 28, the main cylinder oil circuit 2 is manually controlled to be depressurized, sudden situations are coped with, and the safety of foaming work is ensured.

[0057] Optionally, a throttle valve 30 is arranged on the connecting pipeline of the outlet of the high-pressure resistant safety valve 14 and an oil tank. When the pressure in the main cylinder oil circuit 2 is too large, the throttle valve 30 can control the pressure relief flow, and the influence of instantaneous pressure relief on system stability is avoided.

[0058] Optionally, a third pressure sensor 31 for measuring the pressure of the main cylinder oil circuit 2 is arranged on the first oil outlet pipeline 5, so that the pressure of the main cylinder oil circuit 2 is pressurized, maintained and depressurized according to the pressure requirement, and the foaming requirement is met.

[0059] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement made in the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A supercritical ultra-high pressure molding foaming hydraulic system, characterized in that, It includes an oil supply line (1), a main cylinder oil line (2), and a control valve assembly (3), wherein: A delivery pump (4) is installed on the oil supply pipeline (1), the oil inlet of the delivery pump (4) is connected to the oil tank, and the oil supply pipeline (1) is connected to the control valve group (3); The control valve assembly (3) is provided with a first oil outlet line (5), a second oil outlet line (6), a third oil outlet line (7), a fourth oil outlet line (8) and a fifth oil outlet line (9); The first oil outlet line (5) is connected to the main cylinder oil line (2), and the first oil outlet line (5) is sequentially provided with a first ultra-high pressure valve (10), a high pressure resistant booster valve (11), and a second ultra-high pressure valve (12); The main cylinder oil circuit (2) is equipped with a high-pressure resistant filling valve (13), which is provided with a first hydraulic control port and an inlet port. The second oil outlet pipeline (6) is connected to the first hydraulic control port, and the inlet port is connected to the oil tank. The main cylinder oil circuit (2) is equipped with a high-pressure safety valve (14), the high-pressure safety valve (14) is equipped with a second hydraulic control port and a liquid outlet, the third oil outlet pipeline (7) is connected to the second hydraulic control port, and the liquid outlet is connected to the oil tank; The main cylinder oil circuit (2) is equipped with a high-pressure fast mold opening valve (15), which has a normally closed port and a bypass port. The fourth oil outlet pipe (8) is connected to the normally closed port, and the bypass port is connected to the oil tank. The fifth oil outlet line (9) is connected to the high-pressure booster valve (11) to drive the valve core of the high-pressure booster valve (11).

2. The supercritical ultra-high pressure molding foaming hydraulic system according to claim 1, characterized in that, The control valve group (3) is provided with a main oil line connected to the oil supply line (1), a first branch oil line connected to the first oil outlet line (5), a second branch oil line connected to the second oil outlet line (6), a third branch oil line connected to the third oil outlet line (7), a fourth branch oil line connected to the fourth oil outlet line (8), and a fifth branch oil line connected to the fifth oil outlet line (9). The main oil line is provided with a first check valve (16) and a first pressure sensor (17).

3. The supercritical ultra-high pressure molding foaming hydraulic system according to claim 2, characterized in that, The control valve group (3) includes a first directional valve (18), the pressure port of the first directional valve (18) is connected to the main oil circuit, the return port of the first directional valve (18) is connected to the oil tank, and the first branch oil circuit is connected to one working port of the first directional valve (18).

4. The supercritical ultra-high pressure molding foaming hydraulic system according to claim 2, characterized in that, The control valve group (3) includes a second directional valve (19), the pressure port of the second directional valve (19) is connected to the main oil circuit, the return port of the second directional valve (19) is connected to the oil tank, and the second branch oil circuit is connected to one working port of the second directional valve (19).

5. The supercritical ultra-high pressure molding foaming hydraulic system according to claim 2, characterized in that, The control valve group (3) includes a third directional valve (20), the pressure port of the third directional valve (20) is connected to the main oil circuit, the return port of the third directional valve (20) is connected to the oil tank, the third branch oil circuit is connected to one working port of the third directional valve (20), and a first high-pressure hydraulic ball valve (21) is provided on the third oil outlet pipeline (7).

6. The supercritical ultra-high pressure molding foaming hydraulic system according to claim 2, characterized in that, The control valve group (3) includes a fourth directional valve (22), the pressure port of the fourth directional valve (22) is connected to the main oil circuit, the return port of the fourth directional valve (22) is connected to the oil tank, the fourth branch oil circuit is connected to one working port of the fourth directional valve (22), and a second check valve (23) and a second pressure sensor (24) are provided on the fourth branch oil circuit.

7. The supercritical ultra-high pressure molding foaming hydraulic system according to claim 2, characterized in that, The control valve group (3) includes a fifth directional valve (25), the pressure port of the fifth directional valve (25) is connected to the main oil circuit, the return port of the fifth directional valve (25) is connected to the oil tank, the fifth branch oil circuit is connected to one working port of the fifth directional valve (25), and an electromagnetic ball valve (26) is provided on the fifth branch oil circuit.

8. The supercritical ultra-high pressure molding foaming hydraulic system according to claim 1, characterized in that, The second hydraulic control port is also connected to a manual pressure relief pipeline (27), on which a manual pump (28) is provided, and the oil outlet of the manual pump (28) is provided with a second high-pressure hydraulic ball valve (29).

9. The supercritical ultra-high pressure molding foaming hydraulic system according to claim 1, characterized in that, A throttle valve (30) is installed on the connecting pipe between the liquid outlet and the oil tank.

10. The supercritical ultra-high pressure molding foaming hydraulic system according to claim 1, characterized in that, A third pressure sensor (31) for measuring the pressure of the main cylinder oil circuit (2) is installed on the first oil outlet line (5).

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