Gas-oil path system and control method of isostatic pressing ceramic mold

Abstract

The application provides a gas oil path system and control method of isostatic pressing ceramic mold, wherein the gas oil path system of isostatic pressing ceramic mold comprises a mold, a speed increasing main cylinder, a liquid filling valve path, a pressure increasing cylinder, a servo pump group, an oil tank, a gas source three-way joint, a valve group, a pneumatic oil pumping cylinder, a speed regulating valve, a pneumatic electromagnetic valve, a pressure sensor and a pipeline; the servo pump group is used for supplying oil to the valve group, and controls the pressure and speed closed loop of the speed increasing main cylinder and the pressure increasing cylinder; the servo pump group is used as a power source to control each action, and can rotate at low speed or stop rotating when not working, so that the element life is improved while energy saving, noise reduction, high efficiency and reliability are realized; the mold forming pressure is controlled through the pressure increasing cylinder structure, and only the pressure increasing cylinder rod cavity pressure needs to be ensured to reach high pressure, so that the system pressure is reduced; the oil pumping and oil discharging actions are realized through the pneumatic oil pumping cylinder, the pneumatic part saves cost and simplifies the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ceramic forming, in particular to a gas-oil path system of isostatic pressing ceramic mold and a control method. BACKGROUND

[0002] Traditionally, the concept of ceramics refers to various products made of clay and other natural minerals as raw materials, through processes such as crushing, molding, and firing. It is also known as ordinary ceramics. With the development of modern science and technology, new materials, new processes, and new technologies are constantly updated and adopted, resulting in the emergence of many new special ceramics.

[0003] In the production process of ceramic products, forming is a means of making product shapes. Because of the different properties and quality requirements of ceramic products, there are many methods for making ceramic product shapes, which can be divided into three categories: plastic forming, slip casting, and pressing forming. Among them, the pressing forming includes an isostatic pressing forming process. Isostatic pressing forming is a new development of dry pressing forming technology, and each face of the single model is under stress, which is better than dry pressing forming. It is a method of placing powder in a closed container and using liquid or gas to uniformly press the powder in the container in all directions. Because the pressure transmitted by the liquid medium during isostatic pressing forming is equal in all directions, the deformation of the elastic mold under the pressure of the liquid medium is transmitted to the powder in the mold, the friction between the powder and the mold wall is small, the stress of the green body is uniform, the density distribution is uniform, and the performance of the product is greatly improved. SUMMARY

[0004] Therefore, it is necessary to provide a gas-oil path system of isostatic pressing ceramic mold and a control method to solve the above technical problems.

[0005] The air oil way system of isostatic pressing ceramic mold comprises a mold (1), a speed increasing main cylinder (2), a liquid filling valve way (4), a pressure increasing cylinder (10), a servo pump group (29), an oil tank (27), an air source three-way joint (21), a valve group (8), a pneumatic oil pumping cylinder (15), a speed regulating valve (16), a pneumatic electromagnetic valve (17), a pressure sensor and a pipeline; the servo pump group (29) is used for supplying oil to the valve group (8) to control the pressure and speed closed loop of the speed increasing main cylinder (2) and the pressure increasing cylinder (10); the pipeline comprises a speed increasing main cylinder rod cavity pipeline (3), a speed increasing cylinder pipeline (5), a liquid filling valve control oil pipeline (6), a speed increasing main cylinder plug cavity pipeline (7), a pressure increasing cylinder plug cavity pipeline (11), a pressure increasing cylinder rod cavity pipeline (12), a mold pipeline (13), a pneumatic oil pumping cylinder plug cavity oil pipeline (22), a pneumatic oil pumping cylinder rod cavity oil pipeline (23), a valve group oil return pipeline (28) and a liquid filling valve oil suction pipeline (30); the pressure sensor comprises a system pressure sensor (XP0), a speed increasing main cylinder plug cavity pressure sensor (XP1) and a pressure increasing cylinder rod cavity pressure sensor (XP2); the mold (1) is connected with the speed increasing main cylinder (2), the liquid filling valve way (4) is installed on the speed increasing main cylinder (2) and connected with the oil tank (27) through the liquid filling valve oil suction pipeline (30), the speed increasing main cylinder (2) is connected with the valve group (8) through the speed increasing main cylinder rod cavity pipeline (3), the speed increasing cylinder pipeline (5) and the speed increasing main cylinder plug cavity pipeline (7), the speed increasing main cylinder plug cavity pressure sensor (XP1) is installed on the speed increasing main cylinder plug cavity pipeline (7), the pressure increasing cylinder (10) is connected with the valve group (8) through the pressure increasing cylinder rod cavity pipeline (12), and the pressure increasing cylinder rod cavity pressure sensor (XP2) is installed on the pressure increasing cylinder rod cavity pipeline (12); the valve group (8) is connected with the oil tank (27) through the valve group oil return pipeline (28), the valve group (8) is connected with the mold (1) through the mold pipeline (13), the valve group (8) is connected with the system pressure sensor (XP0), the oil tank (27) is connected with the servo pump group (29), meanwhile, the pneumatic oil pumping cylinder (15) is connected with the pneumatic oil pumping cylinder plug cavity oil pipeline (22) and the pneumatic oil pumping cylinder rod cavity oil pipeline (23), the pneumatic oil pumping cylinder (15) is connected with the speed regulating valve (16), the speed regulating valve (16) is connected with the pneumatic electromagnetic valve (17), one end of the pneumatic electromagnetic valve (17) is connected with the air source three-way joint (21), and the other end of the air source three-way joint (21) is connected with an air source.

[0006] In one of the embodiments, the valve group (8) comprises: a main cylinder control valve A1, a booster cylinder control valve A2, an oil discharge control valve A3, and a pump source control valve A4; wherein the oil discharge control valve A3 comprises: a hydraulic control check valve C2, a check throttle valve C3, and an electromagnetic valve YV3; the pump source control valve A4 comprises: an electromagnetic valve YV1, an electromagnetic valve YV2, a system high-pressure overflow valve F1, and a system low-pressure overflow valve F2.

[0007] In one of the embodiments, it further comprises: a quick connector (9); one end of the quick connector (9) is connected with the mold (1), and the other end of the quick connector (9) is connected with the mold pipeline (13), which is used for replacing the mold (1).

[0008] In one of the embodiments, it further comprises: a travel switch (14); the travel switch (14) is used for controlling the movement of the speed-increasing main cylinder (2) and the pneumatic oil pumping cylinder (15); wherein the travel switch (14) comprises: a travel switch SQ1, a travel switch SQ2, a travel switch SQ3, a travel switch SQ4, and a travel switch SQ5.

[0009] In one of the embodiments, it further comprises: a check valve (24) and a filter (25); the check valve (24) and the filter (25) are installed on the pneumatic oil pumping cylinder rod cavity oil pipe (23); the check valve (24) is used for preventing oil from being pumped from the oil tank (27) during oil pumping; and the filter (25) is used for filtering oil liquid.

[0010] In one of the embodiments, it further comprises: a coarse filter (26); the coarse filter (26) is installed in the oil tank (27) and is used for filtering larger particles in the oil tank (27).

[0011] In one of the embodiments, it further comprises: an air pipe (20); the air pipe is connected with the pneumatic electromagnetic valve (17) and the air source three-in-one piece (21).

[0012] In one of the embodiments, it further comprises: a silencer (18); the silencer (18) is connected with the pneumatic electromagnetic valve (17) and is used for silencing during exhaust.

[0013] In one of the embodiments, it further comprises: a pressure release valve (19); the pressure release valve (19) is used for releasing residual pressure in the air pipe (20).

[0014] A gas and oil line system control method of an isostatic pressing ceramic mold, applied to the gas and oil line system of the isostatic pressing ceramic mold, comprising:

[0015] The servo pump group (29) is started to supply oil to the valve group (8), and the valve group (8) is powered through the travel switch (14);

[0016] In response to the electromagnetic valve YV1 being powered, the system low-pressure overflow valve F2 is activated, the main cylinder control valve A1 controls the filling valve control oil line (6) to open the filling valve path (4), oil is sucked from the oil tank (27) through the filling valve oil suction pipe (30), and oil is injected into the speed-up cylinder of the speed-up master cylinder (2) through the speed-up cylinder line (5), and at the same time, the rod cavity of the speed-up master cylinder (2) is quickly drained through the speed-up master cylinder rod cavity line (3) to realize the quick action of the speed-up master cylinder (2); in response to the travel switch SQ2 signaling, the electromagnetic valve YV2 is powered, the system high-pressure overflow valve F1 is activated, the main cylinder control valve A1 controls the filling valve control oil line (6) to close the filling valve path (4), the filling valve oil suction pipe (30) stops sucking oil, and oil is injected into the speed-up cylinder of the speed-up master cylinder (2) through the speed-up cylinder line (5) and the speed-up master cylinder plug cavity line (7), and at the same time, the rod cavity of the speed-up master cylinder (2) is slowly drained through the speed-up master cylinder rod cavity line (3) to realize the slow action of the speed-up master cylinder (2); in response to the travel switch SQ3 signaling or the pressure of the speed-up master cylinder plug cavity pressure sensor (XP1) reaching a preset first pressure, the speed-up master cylinder (2) enters the mold cavity unloading state after mold clamping pressure maintaining; in response to the electromagnetic valve YV3 being powered, the one-way throttle valve C3 and the hydraulic control one-way valve C2 in the oil discharge control valve A3 are opened, the air pipe (20) is kept ventilated, the pneumatic electromagnetic valve (17) is powered, the rod cavity of the pneumatic oil cylinder (15) is ventilated, the pneumatic oil cylinder (15) draws oil in the mold (1) through the mold line (13) and the pneumatic oil cylinder plug cavity oil pipe (22) to the plug cavity of the pneumatic oil cylinder (15), and the rod cavity of the pneumatic oil cylinder (15) discharges oil to the oil tank (27); in response to the travel switch SQ5 signaling, the oil drawing action is completed.

[0017] In response to the energization of the solenoid valve YV2, the high-pressure relief valve F1 of the system is activated, and the booster cylinder control valve A2 controls the booster cylinder rod chamber pipeline (12) and the mold pipeline (13) to inject oil into the booster cylinder (10), and the booster cylinder (10) discharges oil through the booster cylinder plug chamber pipeline (11); in response to the pressure of the booster cylinder rod chamber pressure sensor (XP2) reaching the preset second pressure, the booster cylinder control valve A2 controls the booster cylinder plug chamber pipeline (11) to receive oil, so that the booster cylinder rod chamber pressure sensor (XP2) can be activated. The pressure of XP2) maintains the second pressure; the air source triplet (21) remains energized, the pneumatic solenoid valve (17) is de-energized, the cylinder end plug chamber of the pneumatic oil extraction cylinder (15) is ventilated, controlling the pneumatic oil extraction cylinder (15) to draw oil from the oil tank (27) through the oil pipe (22) of the pneumatic oil extraction cylinder plug chamber, and the pneumatic oil extraction cylinder (15) discharges oil to the oil tank (27) through the oil pipe (23) of the pneumatic oil extraction cylinder rod chamber, the check valve (24) and the filter (25); in response to the signal of the limit switch SQ4, the oil discharge action ends.

[0018] The pressure relief operation is performed on the plug chamber and rod chamber of the booster cylinder (10) and the plug chamber of the speed-increasing main cylinder (2). The speed-increasing main cylinder (2) performs a return stroke. When the speed-increasing main cylinder (2) returns to the position, the limit switch SQ3 sends a signal, and the semi-automatic operation ends.

[0019] Compared to existing technologies, the advantages and beneficial effects of this invention are as follows: This invention uses a servo pump unit as a power source to control various actions. When not in operation, it can rotate at low speed or stop rotating, thus improving component lifespan while achieving energy saving, noise reduction, high efficiency, and reliability. The molding pressure of the mold is controlled through a booster cylinder structure; only the pressure in the booster cylinder rod chamber needs to reach high pressure, reducing system pressure. Oil extraction and discharge are performed using a pneumatic oil extraction cylinder, saving costs on the pneumatic components and simplifying the system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the gas-oil circuit system of an isostatic pressing ceramic mold in one embodiment. Detailed Implementation

[0021] Before describing the specific embodiments of the present invention, the overall concept of the present invention will be explained as follows:

[0022] This invention primarily focuses on the development of ceramic forming processes. Currently, ceramic forming systems and methods utilize conventional plunger pump sets as power sources, with the motor constantly operating at high speeds. This approach is energy-inefficient, noisy, lacks speed control, generates heat rapidly, directly increases system pressure, and necessitates increased motor power. Furthermore, the use of hydraulic cylinders for oil extraction and discharge complicates the system and adds more oil circuitry, leading to higher costs.

[0023] The inventor finds that the main reason for the above problems is that the common plunger pump group is used as the power source, the motor is always in a high speed working state, and the forming pressure is controlled by using a booster cylinder. The problems can be avoided by using a pneumatic oil cylinder to extract the oil in the mold. Therefore, the application provides a gas-oil circuit system and method for isostatic pressing of a ceramic mold.

[0024] After the overall concept of the application is introduced, in order to make the purpose, technical scheme and advantages of the application more clear and understandable, the application will be further described in detail below by combining specific embodiments with the accompanying drawings.

[0025] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of the present application should be understood as the general meaning understood by those skilled in the art to which the present application belongs. The terms "first", "second" and the like used in one or more embodiments of the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and the like mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] The application will be further described in detail below by combining specific embodiments with the accompanying drawings:

[0027] The reference numerals in the accompanying drawings include: mold (1), speed-increasing master cylinder (2), speed-increasing master cylinder rod chamber pipeline (3), filling valve pipeline (4), speed-increasing cylinder pipeline (5), filling valve control oil pipeline (6), speed-increasing master cylinder plug chamber pipeline (7), valve assembly (8), quick connector (9), booster cylinder (10), booster cylinder plug chamber pipeline (11), booster cylinder rod chamber pipeline (12), mold pipeline (13), limit switch (14), pneumatic oil extraction cylinder (15), speed control valve (16), pneumatic solenoid valve (17), muffler (18), pressure relief valve (19), air pipe (20), air source triplet (21), pneumatic oil extraction cylinder plug chamber. Oil pipe (22), pneumatic oil cylinder rod chamber oil pipe (23), check valve (24), filter (25), coarse filter (26), oil tank (27), valve group return oil pipe (28), servo pump group (29), filling valve suction pipe (30), main cylinder control valve A1, booster cylinder control valve A2, oil discharge control valve A3, pump source control valve A4, hydraulic control check valve C2, one-way throttle valve C3, solenoid valve YV1, solenoid valve YV2, solenoid valve YV3, system high pressure relief valve F1, system low pressure relief valve F2, limit switch SQ1, limit switch SQ2, limit switch SQ3, limit switch SQ4, limit switch SQ5.

[0028] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] Example 1

[0030] like Figure 1 As shown, an air-oil circuit system for isostatic pressing ceramic mold is provided, including: mold (1), speed-increasing main cylinder (2), filling valve circuit (4), booster cylinder (10), servo pump group (29), oil tank (27), air source triple unit (21), valve group (8), pneumatic oil extraction cylinder (15), speed regulating valve (16), pneumatic solenoid valve (17), pressure sensor and pipeline; the servo pump group (29) is used to supply oil to the valve group (8) and control the pressure and speed closed loop of the speed-increasing main cylinder (2) and booster cylinder (10); the servo pump group (29) can perform pressure and speed closed loop control on different speeds of the speed-increasing main cylinder (2) as needed, and can also perform differentiated control on the various specifications of the oil cylinders in the system.

[0031] The pipelines include: speed-increasing master cylinder rod chamber pipeline (3), speed-increasing cylinder pipeline (5), filling valve control oil pipeline (6), speed-increasing master cylinder plug chamber pipeline (7), booster cylinder plug chamber pipeline (11), booster cylinder rod chamber pipeline (12), mold pipeline (13), pneumatic sucker cylinder plug chamber oil pipeline (22), pneumatic sucker cylinder rod chamber oil pipeline (23), valve group return oil pipeline (28), and filling valve suction oil pipeline (30). The pressure sensors include: system pressure sensor (XP0), speed-increasing master cylinder plug chamber pressure sensor (XP1), and booster cylinder rod chamber pressure sensor (XP2). The booster cylinder rod chamber pressure sensor is also the product molding pressure sensor. The mold (1) is connected to the speed-increasing main cylinder (2). The filling valve (4) is installed on the speed-increasing main cylinder (2) and connected to the oil tank (27) through the filling valve suction pipe (30). The speed-increasing main cylinder (2) is connected to the valve group (8) through the speed-increasing main cylinder rod chamber pipe (3), the speed-increasing cylinder pipe (5), and the speed-increasing main cylinder plug chamber pipe (7). The main cylinder plug chamber pressure sensor (XP1) is installed on the speed-increasing main cylinder plug chamber pipe (7). The booster cylinder (10) is connected to the valve group (8) through the booster cylinder rod chamber pipe (12). The booster cylinder rod chamber pressure sensor (XP2) is installed on the booster cylinder rod chamber pipe (12). The valve group (8) is connected to the oil tank (27) through the valve group return oil pipe (28). The valve group (8) is connected to the mold (1) through the mold pipeline (13), and the valve group (8) is connected to the system pressure sensor (XP0); the oil tank (27) is connected to the servo pump group (29), and at the same time, it is connected to the pneumatic oil pump cylinder (15) through the pneumatic oil pump cylinder plug chamber oil pipe (22) and the pneumatic oil pump cylinder rod chamber oil pipe (23). The pneumatic oil pump cylinder (15) is connected to the speed control valve (16), the speed control valve (16) is connected to the pneumatic solenoid valve QV1 (17), the pneumatic solenoid valve QV1 (17) is connected to one end of the air source triplet (21), and the other end of the air source triplet (21) is connected to the air source. The air source triplet (21) can perform pressure regulation, filtration and water removal actions on the air source.

[0032] The valve assembly (8) includes: master cylinder control valve A1, booster cylinder control valve A2, oil discharge control valve A3 and pump source control valve A4; wherein, the oil discharge control valve A3 includes: one-way throttle valve C3, hydraulic control one-way valve C2 and solenoid valve YV3; the pump source control valve A4 includes: solenoid valve YV1, solenoid valve YV2, system high pressure relief valve F1 and system low pressure relief valve F2.

[0033] An isostatic pressing ceramic mold gas-oil circuit system further includes: a quick-connect connector (9); one end of the quick-connect connector (9) is connected to one end of the mold (1), and the other end of the quick-connect connector (9) is connected to the mold pipeline (13) for replacing the mold (1).

[0034] The gas oil circuit system of the isostatic pressing ceramic mold further comprises: a travel switch (14); the travel switch (14) is used for controlling the movement of the speed increasing main cylinder (2) and the pneumatic oil pumping cylinder (15); wherein the travel switch (14) comprises: a travel switch SQ1, a travel switch SQ2, a travel switch SQ3, a travel switch SQ4 and a travel switch SQ5.

[0035] The gas oil circuit system of the isostatic pressing ceramic mold further comprises: a one-way valve (24) and a filter (25); the one-way valve (24) and the filter (25) are installed on the pneumatic oil pumping cylinder rod cavity oil pipe (23), the one-way valve (24) is used for preventing oil pumping from the oil tank (27); the filter (25) is used for filtering oil discharge oil, and is further provided with a blockage alarm switch NL; when the alarm sends a signal, it reminds to replace the filter element.

[0036] The gas oil circuit system of the isostatic pressing ceramic mold further comprises: a coarse filter (26); the coarse filter (26) is installed in the oil tank (27) and is used for filtering larger particles in the oil tank (27).

[0037] The gas oil circuit system of the isostatic pressing ceramic mold further comprises: an air pipe (20); the air pipe connects the pneumatic electromagnetic valve QV1 (17) and the gas source three-way joint (21), and is a pipeline for connecting various gas valves.

[0038] The gas oil circuit system of the isostatic pressing ceramic mold further comprises: a silencer (18); the silencer (18) is connected with the pneumatic electromagnetic valve QV1 (17) and is used for silencing during exhaust.

[0039] The gas oil circuit system of the isostatic pressing ceramic mold further comprises: a pressure release valve (19); the pressure release valve (19) is used for releasing residual pressure in the air pipe (20).

[0040] Embodiment two

[0041] The control method of the gas oil circuit system of the isostatic pressing ceramic mold, which is controlled by the control method of the gas oil circuit system of the isostatic pressing ceramic mold in embodiment one, has the following working process:

[0042] First step: the servo pump group (29) is started to supply oil to the valve group (8), and the high pressure, low pressure and unloading state of the gas oil circuit system of the isostatic pressing ceramic mold is controlled through the pump source control valve A4 of the valve group (8).

[0043] Second step: when electromagnetic valve YV1 is electrified, the low pressure overflow valve F2 of the gas-oil system of the isostatic pressing ceramic mold is activated, and the corresponding control of the main cylinder control valve A1 is made, so that the low pressure oil is passed through the liquid filling valve control oil way (6) to open the liquid filling valve way (4) installed on the speed increasing main cylinder (2), the speed increasing cylinder way (5) is filled with oil into the speed increasing cylinder of the speed increasing main cylinder (2), the liquid filling valve oil suction pipeline (30) starts to suck oil from the oil tank (27), and the rod cavity of the speed increasing main cylinder (2) is quickly discharged through the speed increasing main cylinder rod cavity pipeline (3), so as to meet the quick action of the speed increasing main cylinder. When the travel switch SQ2 sends a signal, the electromagnetic valve YV2 is electrified, the system high pressure overflow valve F1 is activated, and the corresponding control of the A1 main cylinder control valve is made, so that the liquid filling valve control oil way (6) is not passed through the oil, the liquid filling valve way (4) is closed, so that the liquid filling valve oil suction pipeline (30) is not sucked, at the same time, the speed increasing main cylinder (2) is filled with oil through the speed increasing cylinder way (5) and the speed increasing main cylinder plug cavity pipeline (7), and the speed increasing main cylinder (2) is slowly discharged through the speed increasing main cylinder rod cavity pipeline (3), so as to meet the slow action of the speed increasing main cylinder (2). When the travel switch SQ3 sends a signal or the main cylinder plug cavity pressure reaches the set pressure XP1, the speed increasing main cylinder (2) enters the mold closing pressure maintaining state and then carries out the mold cavity blanking. In the process of the speed increasing main cylinder (2) fast feeding to the mold cavity blanking, the electromagnetic valve YV3 in the oil discharge control valve A3 is electrified, the oil of the gas-oil system of the isostatic pressing ceramic mold is opened through the one-way throttle valve C3 to open the hydraulic control one-way valve C2. At the same time, the air pipe (20) keeps aeration, the pneumatic electromagnetic valve QV1 (17) is electrified, the rod cavity of the pneumatic oil cylinder (15) is aerated, so that the pneumatic oil cylinder (15) discharges the oil in the mold (1) through the mold pipeline (13) and the pneumatic oil cylinder plug cavity oil pipe (22) to the oil cylinder end plug cavity of the pneumatic oil cylinder (15), and the pneumatic oil cylinder (15) is passively discharged to the oil tank (27), wherein when the travel switch SQ5 sends a signal, the oil discharge action is completed.

[0044] Third step: after the second part is completed, the electromagnetic valve YV2 is powered, the system high pressure overflow valve F1 is activated, and the corresponding control of the intensifier cylinder control valve A2 is performed again, so that the connected intensifier cylinder rod cavity pipeline (12) and mold pipeline (13) are filled with oil, and the intensifier cylinder (10) is controlled by the intensifier cylinder plug cavity pipeline (11) to discharge oil, when the pressure of the intensifier cylinder rod cavity pressure sensor (XP2) reaches the value set according to the process, the intensifier cylinder (10) control valve A2 is controlled again, so that the intensifier cylinder plug cavity pipeline (11) is filled with oil, and the intensifier cylinder rod cavity pressure sensor (XP2) reaches the value set according to the process. In the process of realizing isostatic forming of the intensifier cylinder (10), the air source three-way joint (21) keeps ventilating, the pneumatic electromagnetic valve QV1 (17) is powered off, the cylinder end plug cavity of the pneumatic oil cylinder (15) is ventilated, the pneumatic oil cylinder plug cavity oil pipe (22) of the pneumatic oil cylinder (15) is passively filled with oil from the oil tank (27), so that the pneumatic oil cylinder (15) pushes the oil in the oil cylinder end plug cavity out through the pneumatic oil cylinder rod cavity oil pipe (23), and the oil flows back to the oil tank (27) after being filtered by the one-way valve (24) and the filter (25). When the travel switch SQ4 sends a signal, the oil discharge action is completed.

[0045] Fourth step: after the pressure maintaining action of the intensifier cylinder in the third step is completed, the plug cavity of the intensifier cylinder (10) is depressurized, the rod cavity of the intensifier cylinder (10) is depressurized, and the plug cavity of the speed-up master cylinder (2) is depressurized, and finally the speed-up master cylinder (2) performs a return action, and when the travel switch SQ3 sends a signal, the semi-automatic action is completed.

[0046] The application adopts a servo pump group as a power source to control each action, and can rotate at a low speed or stop rotating when not working, so that the element service life is improved while energy saving, noise reduction, high efficiency and reliability are realized. The mold forming pressure is controlled through the structure of the intensifier cylinder, and only the pressure of the rod cavity of the intensifier cylinder needs to be ensured to be high pressure, so that the system pressure is reduced. The oil discharge and oil discharge actions are performed in the form of the pneumatic oil cylinder, the pneumatic part saves cost and simplifies the system.

[0047] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to limit the scope of the application (including claims) to these examples; under the idea of the application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the application as described above. In order to be brief, they are not provided in detail.

[0048] Any process or method described in a flowchart or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing specific logic functions (or steps) of the process, and alternate implementations are possible. The description of a process or method according to preferred embodiments of the present application should not be construed as necessarily requiring its steps or sequences to be performed in a particular order, and alternatives implementing equivalent functionality can be configured in different orders or omitted or combined. Furthermore, some steps can be performed simultaneously. The various embodiments of the present application described herein can be implemented in software and / or firmware for execution by various types of processors. An identified

[0049] Although the present application has been described in connection with certain specific embodiments thereof, many modifications, changes, variations and substitutions will be apparent to those skilled in the art from the foregoing description.

[0050] Embodiments of the present application are intended to cover all such modifications, changes, variations and substitutions as falling within the scope of the appended claims. Accordingly, the disclosure of the present application is intended to be illustrative, but not limiting, of the scope of the application, which is set forth in the following claims.

Claims

1. A gas oil passage system of an isostatic pressing ceramic mold, characterized by, The utility model relates to a kind of hydraulic servo control systems, including: mould (1), speed-up main cylinder (2), liquid filling valve path (4), pressure cylinder (10), servo pump group (29), oil tank (27), gas source three joint (21), valve group (8), pneumatic oil cylinder (15), speed regulating valve (16), pneumatic solenoid valve (17), pressure sensor and pipeline;The servo pump group (29) is used to oil supply for the valve group (8), controls the pressure and speed closed loop of speed-up main cylinder (2) and pressure cylinder (10);The pipeline includes: speed-up main cylinder rod cavity pipeline (3), speed-up cylinder pipeline (5), liquid filling valve control oil pipeline (6), speed-up main cylinder plug cavity pipeline (7), pressure cylinder plug cavity pipeline (11), pressure cylinder rod cavity pipeline (12), mould pipeline (13), pneumatic oil cylinder plug cavity oil pipe (22), pneumatic oil cylinder rod cavity oil pipe (23), valve group oil return pipeline (28) and liquid filling valve oil suction pipeline (30);The pressure sensor includes: system pressure sensor (XP0), speed-up main cylinder plug cavity pressure sensor (XP1) and pressure cylinder rod cavity pressure sensor (XP2);The mould (1) is connected with the speed-up main cylinder (2), the liquid filling valve path (4) is installed on the speed-up main cylinder (2), is connected with the oil tank (27) by the liquid filling valve oil suction pipeline (30), the speed-up main cylinder (2) is connected with the valve group (8) by the speed-up main cylinder rod cavity pipeline (3), the speed-up cylinder pipeline (5) and the speed-up main cylinder plug cavity pipeline (7), the main cylinder plug cavity pressure sensor (XP1) is installed on the speed-up main cylinder plug cavity pipeline (7), the pressure cylinder (10) is connected with the valve group (8) by the pressure cylinder rod cavity pipeline (12), the pressure cylinder rod cavity pressure sensor (XP2) is installed on the pressure cylinder rod cavity pipeline (12);The valve group (8) is connected with the oil tank (27) by the valve group oil return pipeline (28), the valve group (8) is connected with the mould (1) by the mould pipeline (13), the valve group (8) is connected with the system pressure sensor (XP0);The oil tank (27) is connected with the servo pump group (29), simultaneously, it is connected with the pneumatic oil cylinder (15) by the pneumatic oil cylinder plug cavity oil pipe (22) and the pneumatic oil cylinder rod cavity oil pipe (23), the pneumatic oil cylinder (15) is connected with the speed regulating valve (16), the speed regulating valve (16) is connected with the pneumatic solenoid valve (17), the pneumatic solenoid valve (17) is connected with one end of the gas source three joint (21), the other end of the gas source three joint (21) is connected with gas source; Wherein, the valve group (8) includes: main cylinder control valve A1, pressure cylinder control valve A2, oil discharge control valve A3 and pump source control valve A4;Wherein, the oil discharge control valve A3 includes: hydraulic control check valve C2, check valve C3 and solenoid valve YV3;The pump source control valve A4 includes: solenoid valve YV1, solenoid valve YV2, system high pressure overflow valve F1 and system low pressure overflow valve F2. ​ It also includes: travel switch (14) and air pipe (20); wherein, the travel switch (14) includes: travel switch SQ1, travel switch SQ2, travel switch SQ3, travel switch SQ4 and travel switch SQ5.

2. The gas-oil circuit system of the isostatic pressing ceramic mold according to claim 1, wherein, It also includes: Fast plug connector (9); one end of the fast plug connector (9) is connected with the mold (1), and the other end of the fast plug connector (9) is connected with the mold pipeline (13), which is used for replacing the mold (1).

3. The gas-oil line system of the isostatic pressing ceramic mold according to claim 1, wherein, The travel switch (14) is used for controlling the movement of the speed increasing main cylinder (2) and the pneumatic oil pumping cylinder (15).

4. The gas-oil line system of the isostatic pressing ceramic mold according to claim 1, wherein It also includes: One-way valve (24) and filter (25); the one-way valve (24) and the filter (25) are installed on the pneumatic oil pumping cylinder rod cavity oil pipe (23), the one-way valve (24) is used for preventing oil pumping from the oil tank (27); the filter (25) is used for filtering oil.

5. The gas-oil line system of the isostatic pressing ceramic mold according to claim 1, wherein It also includes: Coarse filter (26); the coarse filter (26) is installed in the oil tank (27), which is used for filtering larger particles in the oil tank (27).

6. The gas-oil line system of an isostatic pressing ceramic mold according to claim 1, wherein The air pipe is connected with the pneumatic electromagnetic valve (17) and the air source three-way piece (21).

7. The gas-oil line system of an isostatic pressing ceramic mold according to claim 1, wherein It also includes: Silencer (18); the silencer (18) is connected with the pneumatic electromagnetic valve (17), which is used for silencing when discharging.

8. The gas-oil circuit system of the isostatic pressing ceramic mold according to claim 6, wherein, It also includes: Pressure relief valve (19); the pressure relief valve (19) is used for releasing the residual pressure in the air pipe (20).

9. A method of controlling a gas oil passage system of an isostatic pressing ceramic mold, characterized by, The application relates to an air-oil circuit system of an isostatic pressing ceramic mold, and belongs to the technical field of ceramic mold manufacturing. Start the servo pump group (29) to supply oil to the valve group (8), and send a signal to the valve group (8) through the travel switch (14) to supply power to the valve group (8); In response to the electromagnetic valve YV1 being powered, the system low-pressure overflow valve F2 is activated, the master cylinder control valve A1 opens the filling valve path (4) through the filling valve control oil line (6), oil is sucked from the oil tank (27) through the filling valve oil suction pipe (30), and oil is injected into the speed-up cylinder of the speed-up master cylinder (2) through the speed-up cylinder line (5), while the rod cavity of the speed-up master cylinder (2) is rapidly drained through the speed-up master cylinder rod cavity line (3) to achieve rapid action of the speed-up master cylinder (2); in response to the travel switch SQ2 signaling, the electromagnetic valve YV2 is powered, the system high-pressure overflow valve F1 is activated, the master cylinder control valve A1 closes the filling valve path (4) through the filling valve control oil line (6), the filling valve oil suction pipe (30) stops sucking oil, and oil is injected into the speed-up cylinder of the speed-up master cylinder (2) through the speed-up cylinder line (5) and the speed-up master cylinder plug cavity line (7), while the rod cavity of the speed-up master cylinder (2) is slowly drained through the speed-up master cylinder rod cavity line (3) to achieve slow action of the speed-up master cylinder (2); in response to the travel switch SQ3 signaling or the pressure of the speed-up master cylinder plug cavity pressure sensor (XP1) reaching a preset first pressure, the speed-up master cylinder (2) enters a mold cavity pressure holding state and then performs mold cavity unloading; in response to the electromagnetic valve YV3 being powered, the one-way throttle valve C3 and the hydraulic control one-way valve C2 in the oil discharge control valve A3 are opened, the air pipe (20) remains ventilated, the pneumatic electromagnetic valve (17) is powered, the rod cavity of the pneumatic oil cylinder (15) is ventilated, the pneumatic oil cylinder (15) draws oil in the mold (1) through the mold line (13) and the pneumatic oil cylinder plug cavity oil pipe (22) to the plug cavity of the pneumatic oil cylinder (15), and the rod cavity of the pneumatic oil cylinder (15) discharges oil to the oil tank (27); in response to the travel switch SQ5 signaling, the oil drawing action is completed. In response to the electromagnetic valve YV2 being powered, the system high-pressure overflow valve F1 is activated, the intensifier cylinder control valve A2 controls the intensifier cylinder rod cavity pipeline (12) and the mold pipeline (13) to inject oil into the intensifier cylinder (10), and the intensifier cylinder (10) discharges oil through the intensifier cylinder plug cavity pipeline (11); in response to the pressure of the intensifier cylinder rod cavity pressure sensor (XP2) reaching a preset second pressure, the intensifier cylinder control valve A2 controls the intensifier cylinder plug cavity pipeline (11) to inject oil, so that the pressure of the intensifier cylinder rod cavity pressure sensor (XP2) is maintained at the second pressure; the gas source three-way joint (21) is kept powered, the pneumatic electromagnetic valve (17) is powered off, the pneumatic oil cylinder (15) is vented at the cylinder end plug cavity, the pneumatic oil cylinder (15) is controlled to suck oil from the oil tank (27) through the pneumatic oil cylinder plug cavity oil pipe (22), and the pneumatic oil cylinder (15) discharges oil to the oil tank (27) through the pneumatic oil cylinder rod cavity oil pipe (23), the one-way valve (24) and the filter (25); in response to the travel switch SQ4 signaling, the oil discharge operation ends; The plug cavity and the rod cavity of the intensifier cylinder (10) and the plug cavity of the speed-increasing master cylinder (2) are depressurized, the speed-increasing master cylinder (2) performs a return stroke, and in response to the travel switch SQ3 signaling when the speed-increasing master cylinder (2) returns to the position, the semi-automatic operation ends.

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