CN212734098U

CN212734098U - Pressure stabilizing mechanism of casting mould

Info

Publication number: CN212734098U
Application number: CN202021819385.1U
Authority: CN
Inventors: 简伟文; 陈永剑; 尹之华; 麦俊逸; 陈春阳
Original assignee: Foshan Nanhai Superband Mould Co Ltd
Current assignee: Foshan Nanhai Superband Mould Co Ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2021-03-19
Anticipated expiration: 2030-08-27

Abstract

The pressure stabilizing mechanism of the casting mould is provided with an exhaust channel, and a vacuum valve for shutting off is arranged in the exhaust channel; the pressure stabilizing mechanism also comprises a main driving oil cylinder capable of driving the vacuum valve to perform opening and closing actions and a three-position four-way valve for controlling the action of the main driving oil cylinder, the main driving oil cylinder and the three-position four-way valve are connected with an oil path pipe A and an oil path pipe B, and the three-position four-way valve is also connected with an oil inlet pipe and an oil return pipe; the oil path pipe A is used for providing oil pressure for driving the vacuum valve to open for the main driving oil cylinder, and the oil path pipe B is used for providing oil pressure for driving the vacuum valve to close for the main driving oil cylinder; the oil inlet pipe is also connected with an output pipe of a first energy storage device in parallel, and the oil path pipe B is also connected with an output pipe of a second energy storage device in parallel; the response speed of the main driving oil cylinder for opening and closing the exhaust channel is greatly improved by connecting the oil inlet pipe with the output pipe of the first energy storage device in parallel; the output pipe of the second energy storage device is connected to the oil path pipe B in parallel, so that the sealing effect of the exhaust channel is greatly improved.

Description

Pressure stabilizing mechanism of casting mould

Technical Field

The invention relates to the technical field of relevant dies, in particular to a pressure stabilizing device for controlling an exhaust passage switch of a die-casting die in a high-vacuum die-casting technology.

Background

With the progress of research and development technology, sheet metal parts and iron casting parts are gradually replaced by high-strength cast aluminum alloy castings, but the traditional aluminum alloy casting slowly cannot meet the market demand with higher requirements, and in order to improve the product quality, the aluminum alloy pressure casting is developed from common vacuum casting to high vacuum pressure casting. However, high-vacuum die-casting molds have high requirements for the precision of the mold and the response speed of the exhaust duct sealing device, wherein the response speed of the opening and closing of the exhaust duct sealing device is required to be faster and more accurate due to the short time of the whole vacuumizing and die-casting process.

The Chinese utility model with the patent number of CN206500599U, which was earlier applied by the applicant for this purpose, discloses a vacuum valve system structure applied to high-pressure die casting, which comprises a movable mould insert and a fixed mould insert, wherein an exhaust channel is arranged between the movable mould insert and the fixed mould insert, the vacuum valve system structure further comprises a stop valve connected with the exhaust channel, the input end of the stop valve is connected with a mould cavity through the exhaust channel, the output end of the stop valve is connected with a vacuum machine through a vacuum tube, the working end of the stop valve is connected with a hydraulic cylinder through a closing rod, and an oil pipe of the hydraulic cylinder is connected with a three-position; the die-casting vacuum valve structure utilizes the characteristic that a three-position four-way valve is fast in reaction to accelerate the response speed of the hydraulic cylinder, so that the purpose of controlling the stop valve to be fast opened and closed is achieved. However, in actual use, the vacuum valve system needs to be driven by an external oil pressure system to provide oil pressure, the response speed of the external oil pressure system is influenced by signal transmission and pipeline transmission to cause delay of the response time of the hydraulic cylinder, and as the whole vacuumizing and die-casting process is short, the closing time delay of the stop valve causes aluminum liquid to block the exhaust channel, thereby causing the problems of influencing casting quality, increasing maintenance time and reducing production efficiency; in addition, when the vacuum valve system structure is shut down halfway due to a failure or power failure, the hydraulic cylinder may not be able to close the exhaust passage due to lack of oil pressure, which may also cause a problem that the exhaust passage is clogged with molten aluminum.

Disclosure of Invention

Aiming at the problem of response delay of the vacuum valve system in the prior art, the invention provides a pressure stabilizing mechanism of a casting mold, which aims to further improve the response time of the vacuum valve system, ensure the sealing effect of an exhaust passage and improve the quality of a casting; the pressure stabilizing mechanism also comprises a main driving oil cylinder capable of driving the vacuum valve to open and close, and a three-position four-way valve for controlling the main driving oil cylinder to act, wherein the main driving oil cylinder and the three-position four-way valve are connected with an oil path pipe A and an oil path pipe B, and the three-position four-way valve is also connected with an oil inlet pipe and an oil return pipe; the oil path pipe A is used for providing oil pressure for driving the vacuum valve to be opened for the main driving oil cylinder, and the oil path pipe B is used for providing oil pressure for driving the vacuum valve to be closed for the main driving oil cylinder; the oil inlet pipe is also connected with an output pipe of a first energy storage device in parallel, and the oil path pipe B is also connected with an output pipe of a second energy storage device in parallel.

The vacuum valve is a component which is arranged in the exhaust passage and is used for closing or opening the exhaust passage, and the vacuum valve is connected with the main driving oil cylinder.

The main driving oil cylinder is a component used for driving the vacuum valve to close or open the exhaust channel, the main driving oil cylinder is provided with a connecting rod which slides back and forth, one end of the connecting rod is connected with the vacuum valve, and the main driving oil cylinder is connected with the oil path pipe A and the oil path pipe B and converts the oil pressure difference between the oil path pipe A and the oil path pipe B into acting force for driving the connecting rod to act.

The oil pipeline A and the oil pipeline B are oil pipelines for connecting the main driving oil cylinder and the three-position four-way valve, and oil pressure can be transmitted between the main driving oil cylinder and the three-position four-way valve through the oil pipeline A and the oil pipeline B; in one embodiment, the oil pressure is transmitted in two ways, namely, the first way is that the driving oil pressure with higher pressure is transmitted from the three-position four-way valve to the main driving oil cylinder through the oil path pipe A and drives the connecting rod to slide outwards, and the oil path pipe B transmits the oil pressure of the main driving oil cylinder to the three-position four-way valve; the second is that the driving oil pressure with higher pressure is transmitted from the three-position four-way valve to the main driving oil cylinder through the oil path pipe B and drives the connecting rod to slide inwards, and the oil path pipe A transmits the oil pressure of the main driving oil cylinder to the three-position four-way valve.

The oil inlet pipe and the oil return pipe are connected to an oil conveying pipeline on the three-position four-way valve, the oil inlet pipe is used for transmitting high oil pressure of an external pressure system to the three-position four-way valve so as to provide driving oil pressure for the pressure stabilizing mechanism, and the oil return pipe is used for transmitting the oil pressure of the three-position four-way valve to the external pressure recovery system so as to release the oil pressure of the pressure stabilizing mechanism.

The oil line pipe A is used for providing oil pressure for driving the vacuum valve to open for the main driving oil cylinder, and the oil line pipe B is used for providing oil pressure for driving the vacuum valve to close for the main driving oil cylinder; this aspect illustrates that the connecting rod of the main driving cylinder can be driven to move back and forth by the driving oil pressure provided by the oil path pipe A and the oil path pipe B; on the other hand, it is explained that the vacuum valve can be opened when the driving oil pressure is supplied to the oil line pipe a, and the vacuum valve can be closed when the driving oil pressure is supplied to the oil line pipe B.

The oil inlet pipe is also connected with an output pipe of a first energy storage device in parallel, which means that the output pipe of the first energy storage device is communicated with the oil inlet pipe and is used as a branch of the oil inlet pipe; when external oil pressure is transmitted to the three-position four-way valve through the oil inlet pipe, the oil pressure of the oil inlet pipe can be transmitted to the first energy storage device through the output pipe of the first energy storage device, and the first energy storage device is compressed to store energy; when the oil pressure of the oil inlet pipe is lower than the pressure of the first energy storage device, the pressure of the first energy storage device can be transmitted to the three-position four-way valve through the output pipe of the first energy storage device and the oil inlet pipe.

An output pipe of a second energy storage device is also connected to the oil path pipe B in parallel, which means that the output pipe of the second energy storage device is communicated with the oil path pipe B and is used as a branch of the oil path pipe B; when the three-position four-way valve transmits oil pressure to the main driving oil cylinder through the oil path pipe B, the oil pressure of the oil path pipe B can be transmitted to the second energy storage device through the output pipe of the second energy storage device, and the second energy storage device is compressed to store energy; when the three-position four-way valve stops transmitting oil pressure to the main driving oil cylinder, the pressure of the second energy storage device can be transmitted to the main driving oil cylinder through the output pipe of the second energy storage device and the oil path pipe B.

According to the technical scheme, compared with the prior art, the invention has the beneficial technical effects that: firstly, an output pipe of a first energy storage device is connected to the oil inlet pipe in parallel, when an external oil pressure system transmits oil pressure to the three-position four-way valve through the oil inlet pipe, the first energy storage device can bear the oil pressure and be compressed to store energy, when the three-position four-way valve switches working positions, the first energy storage device can rapidly provide oil pressure for the main driving oil cylinder through the output pipe and the oil inlet pipe of the first energy storage device, and the response speed of the main driving oil cylinder for opening and closing the exhaust channel is greatly improved; and secondly, an output pipe of a second energy storage device is connected to the oil path pipe B in parallel, when the three-position four-way valve is powered off or is actively closed through the oil path pipe B to transmit oil pressure to the main driving oil cylinder so as to close the exhaust channel, the second energy storage device can bear the oil pressure and store energy in a compressed manner, and when the three-position four-way valve is powered off or is actively closed, the second energy storage device can provide pressure for closing the exhaust channel to the main driving oil cylinder through the output pipe of the second energy storage device and the oil path pipe B, so that the exhaust channel is effectively ensured to be closed, the exhaust channel has locking and retaining force, and the sealing effect of the exhaust channel is greatly improved. And thirdly, the first energy storage device can buffer the oil pressure impact of the oil inlet pipe, so that an oil conveying pipeline is well protected, and the service life of the pressure stabilizing mechanism is prolonged.

In order to better control the opening and closing time of the exhaust channel, the mold further comprises an injection machine, wherein a molten metal output pipe of the injection machine is communicated with a pouring gate of the mold, and the injection machine is provided with a molten metal injection cylinder and a position sensor capable of synchronizing the extrusion position of the molten metal injection cylinder; the three-position four-way valve is connected with the position sensor through signals, and the controller is used for responding to the signals of the position sensor and correspondingly controlling the three-position four-way valve, the first energy storage device and the second energy storage device. The molten metal injection cylinder is a component which is arranged on the injection machine and is used for containing and injecting molten metal into the die, the molten metal injection cylinder is communicated with the molten metal output pipe, and the molten metal can be extruded into the die from the molten metal injection cylinder by applying extrusion force to the molten metal in the molten metal injection cylinder; the molten metal injection cylinder extrusion position refers to a position where an extrusion component is located when molten metal is injected into a cylinder extrusion cylinder of the molten metal injection cylinder, in one embodiment, the molten metal injection cylinder comprises a punch used for extruding the molten metal in the cylinder, the molten metal injection cylinder extrusion position refers to a position where the punch moves to extrude the molten metal, and the position of the punch can reflect the position where the molten metal extruded in the molten metal injection cylinder is located; wherein the position sensor is a member provided on the injection machine for sensing the molten metal injection cylinder extrusion position and capable of transmitting a position signal to the controller; in this way, the controller knows the molten metal conveying position of the injection machine by responding to the signal of the position sensor, controls the three-position four-way valve to select different positions according to the extrusion position of the molten metal injection cylinder so as to control the main driving oil cylinder to open or close the exhaust channel, and further realizes the opening of the exhaust channel before the molten metal is injected into the die and the closing of the exhaust channel before the molten metal is injected into the die and reaches the exhaust channel.

The oil inlet pipe is provided with a check valve, the check valve is arranged in front of the parallel connection position of the oil inlet pipe and the output pipe of the first energy storage device, and external oil enters the oil inlet pipe and is prevented from flowing backwards. Wherein the check valve is a member connected in series to the oil inlet pipe and capable of restricting the flow direction of oil in the oil inlet pipe, the check valve is capable of allowing oil of an external oil pressure system to pass through and flow into the oil inlet pipe but not allowing oil in the oil inlet pipe to flow out through the check valve; in addition, after the one-way valve is positioned at the parallel connection position of the output pipe of the first energy storage device and the oil inlet pipe, the oil in the output pipe of the first energy storage device cannot be conveyed outwards through the one-way valve; therefore, on one hand, the external oil pressure can only be transmitted to the oil inlet pipe and the output pipe of the first energy storage device after passing through the one-way valve; on the other hand, through the check valve, if the oil pressure of an external oil pressure system is instantaneously reduced, the pressure stored by the first energy storage device can be transmitted to the three-position four-way valve, and the improvement of the response time of the pressure stabilizing mechanism is facilitated.

In order to facilitate the disassembly and assembly of the first energy storage device, the pressure stabilizing mechanism further comprises an oil drain valve, an input pipe of the oil drain valve is communicated with an output pipe of the first energy storage device, and the output pipe of the oil drain valve is connected to the oil return pipe in parallel. The oil drain valve is a normally closed valve device arranged on an oil way and has the function of plugging an oil pipe; when the pressure stabilizing mechanism works normally, the oil drain valve plugs a pipeline for communicating an output pipe of the first energy storage device with the oil return pipe, so that oil pressure in the oil inlet pipe and the output pipe of the first energy storage device can be only transmitted to the direction of the three-position four-way valve and cannot be discharged to the outside from the oil return pipe; when the pressure stabilizing mechanism needs to be maintained and disassembled to detach the first energy storage device, the oil drain valve is opened so that the pressure of the first energy storage device is discharged outwards through the output pipe of the first energy storage device and the oil return pipe; therefore, through the arrangement of the oil drain valve, the normal work of the pressure stabilizing mechanism can be guaranteed, and the safety of the disassembly and assembly of the first energy storage device is greatly improved.

The invention can be applied to vacuum die casting molds due to the characteristics and advantages.

Drawings

FIG. 1 is a schematic structural view of the pressure stabilizing mechanism, showing a structure when the exhaust passage is open;

FIG. 2 is a schematic structural view of the pressure stabilizing mechanism, showing a structure when the exhaust passage is closed;

fig. 3 is a schematic structural diagram of the three-position four-way valve in a neutral position.

Detailed Description

The voltage stabilizing mechanism applying the technical scheme of the invention is further explained with reference to the attached drawings.

As shown in fig. 1, in the present embodiment, the pressure stabilizing mechanism provided by the present invention is applied to a vacuum pressure casting mold, the casting mold includes a fixed mold 11, a movable mold 12, and a cavity 10 formed by the fixed mold 11 and the movable mold 12, and the cavity 10 is further provided with a gate 15 for allowing molten metal to enter. In order to enable the casting mold to perform high vacuum pressure casting, the cavity 10 is evacuated and the cavity 10 is maintained in a high vacuum state during the die casting process. On the one hand, the mold is required to have good sealing performance, and a sealing structure is arranged on the clamping surface of the fixed mold 11 and the movable mold 12 so as to form a sealing structure around the open cavity 10 when the fixed mold 11 and the movable mold 12 are clamped; on the other hand, the mold is required to be provided with an exhaust passage 13 communicating with the cavity 10, and air in the cavity 10 is evacuated through the exhaust passage 13. Of course, the evacuation channel 13 is also connected to a vacuum extractor (not shown) in order to extract the air from the cavity 10. In order to ensure normal die casting of the casting mold, a vacuum valve 14 capable of opening or closing the exhaust passage 13 is provided in the exhaust passage 13. Before the aluminum liquid is injected into the cavity 10, the vacuum valve 14 opens the exhaust channel 13 so as to enable the vacuumizing device to extract air in the cavity 10, and before the injected metal liquid reaches the exhaust channel 13, the vacuum valve 14 closes the exhaust channel 13 so as to prevent the metal liquid from entering the exhaust channel 13 to cause damage to the casting mold.

In order to improve the response time of the opening and closing of the exhaust passage 13, ensure the normal operation of the casting mold and improve the quality of the casting, the pressure stabilizing mechanism is arranged on the casting mold. The pressure stabilizing mechanism further comprises a main driving oil cylinder 2 capable of driving the vacuum valve 14 to perform switching action, the main driving oil cylinder 2 is a device driven by oil pressure, the main driving oil cylinder 2 is provided with a connecting rod which slides back and forth, and the connecting rod of the main driving oil cylinder 2 is connected with the vacuum valve 14; the main driving cylinder 2 is connected with an oil line pipe A21 and an oil line pipe B22, in the embodiment, when the oil line pipe A21 provides oil pressure for the main driving cylinder 2, the connecting rod of the main driving cylinder 2 drives the vacuum valve 14 to move away from the exhaust channel 13 so as to open the exhaust channel 13; when the oil path pipe B22 provides oil pressure to the main driving cylinder 2, the connecting rod of the main driving cylinder 2 drives the vacuum valve 14 to move and press the exhaust passage 13, so as to close the exhaust passage 13. The other ends of the oil path pipe A21 and the oil path pipe B22 are connected to a three-position four-way valve 3, and the oil pressure can be changed by adjusting the three-position four-way valve 3 and is output by the oil path pipe A21 or the oil path pipe B22, so that the purpose of controlling the action of the main driving oil cylinder 2 is achieved.

In this embodiment, as shown in fig. 1 to fig. 3, an oil inlet pipe 31 and an oil return pipe 32 are further connected to the three-position four-way valve 3, the oil inlet pipe is communicated with a system oil path of the die-casting mold with high oil pressure, and system pressure oil of the die-casting mold can be delivered to the three-position four-way valve 3 through the oil inlet pipe 31; the oil return pipe 32 is communicated with a recovery oil tank of the die-casting die, and the oil return pipe 32 is used for releasing the oil pressure of the pressure stabilizing mechanism to the recovery oil tank. The three-position four-way valve 3 is provided with four interfaces, namely an interface A for connecting the oil path pipe A21, an interface B for connecting the oil path pipe B22, an interface P for connecting the oil inlet pipe 31 and an interface T for connecting the oil return pipe 32; the three-position four-way valve 3 has three working positions, namely a left position, a middle position and a right position. When the three-position four-way valve 3 is in the left position, the port P is communicated with the port B, the port A is communicated with the port T, and the oil pressure of a system oil path of the die-casting die provides oil pressure for driving the vacuum valve 14 to be closed to the main driving oil cylinder 2 through the oil inlet pipe 31, the three-position four-way valve 3 and an oil path pipe B22; when the three-position four-way valve 3 is in the right position, the port P is communicated with the port A, the port B is communicated with the port T, and the oil pressure of a system oil path of the die-casting die provides oil pressure for driving the vacuum valve 14 to be opened to the main driving oil cylinder 2 through the oil inlet pipe 31, the three-position four-way valve 3 and the oil path pipe A21; when the three-position four-way valve 3 is in the middle position, the interface A is communicated with the interface T, and the interface P is disconnected with the interface B.

The pressure stabilizing mechanism further comprises an output pipe 41 which is connected with the oil inlet pipe 31 in parallel and an output pipe 51 which is connected with the oil inlet pipe B22 in parallel and is connected with a first energy storage device. The output pipe 41 of the first energy storage device is connected with the oil inlet pipe 31 and is used as a branch of the oil inlet pipe 31; the output pipe 41 of the first energy storage device is also connected with the first energy storage device 4, and when the oil pressure of the system oil path of the die-casting die transfers the oil pressure to the three-position four-way valve 3 through the oil inlet pipe 31, the oil pressure of the oil inlet pipe 31 can be transferred to the first energy storage device 4 through the output pipe 41 of the first energy storage device, so that the first energy storage device 4 stores energy; when the three-position four-way valve 3 is switched from the middle position to the left position or the right position, if the instantaneous oil pressure of the oil inlet pipe 31 is reduced, the pressure of the first energy storage device 4 can be transmitted to the three-position four-way valve 3 through the output pipe 41 of the first energy storage device and the oil inlet pipe 31. In addition, the first energy storage device 4 can bear the instantaneously raised oil pressure when the oil pressure of the system oil path of the die-casting die passes through the oil inlet pipe 31, so that the pressure of the oil inlet pipe 31 is buffered. The first energy storage device 4 plays a role in buffering oil pressure, and can improve the response speed of the main driving oil cylinder 2. The output pipe 51 of the second energy storage device is communicated with the oil circuit pipe B22 and is used as a branch of the oil circuit pipe B22; as shown in fig. 2, when the three-position four-way valve 3 is in the left position, the first energy storage device 5 stores energy in the process that the oil path pipe B22 transmits oil pressure to the main driving cylinder 2, and when the three-position four-way valve 3 is powered off or actively switched from the right position to the middle position, the second energy storage device 5 can provide pressure for closing the exhaust passage to the main driving cylinder 2 through the output pipe 51 of the second energy storage device and the oil path pipe B22, so as to effectively ensure that the exhaust passage 13 is closed, and the exhaust passage has a locking holding force, thereby greatly improving the sealing effect of the exhaust passage.

Further, a check valve 6 is provided on the oil inlet pipe 31, the check valve 6 is a member connected in series to the oil inlet pipe 31 and capable of restricting the flow direction of oil in the oil inlet pipe 31, and the check valve 6 allows external oil to pass through and flow into the oil inlet pipe 31 but prevents oil in the oil inlet pipe 31 from flowing out through the check valve 6. The check valve 6 is disposed in front of a position where the oil inlet pipe 31 is connected in parallel with the output pipe 41 of the first energy storage device, and the check valve 6 is used for allowing external oil to enter the oil inlet pipe 31 but preventing the oil in the oil inlet pipe 31 from flowing backwards. Therefore, even if the oil pressure of a system oil way of the die-casting die is transmitted to the three-position four-way valve 3 and the first energy storage device 4 through the one-way valve 6, the oil pressure is not output reversely, so that the first energy storage device 4 can store energy; on the other hand, the pressure stored in the first energy storage device 4 is transmitted to the three-position four-way valve 3 under the obstruction of the one-way valve 6, thereby being beneficial to improving the response time of the pressure stabilizing mechanism.

In order to better control the opening and closing time of the exhaust channel 13, the pressure stabilizing mechanism further comprises an injection machine, a molten metal outlet pipe 7 of the injection machine is communicated with a gate 15 of the die, a molten metal injection cylinder 8 is arranged on the injection machine, wherein in the embodiment, the molten metal injection cylinder 8 is a component which is arranged on the injection machine and used for containing and injecting molten metal into the die, and the molten metal injection cylinder 8 is communicated with the molten metal outlet pipe 7. In order to be able to extrude the molten metal into the cavity of the die. As shown in fig. 1, the molten metal injection cylinder 8 includes a punch 81 for pressing molten metal in the cylinder, and the punch 81 can press the molten metal in the molten metal injection cylinder 8 to be injected into the cavity 10 of the mold. A position sensor (not shown in the figure) capable of synchronizing the extrusion position of the molten metal injection cylinder 8 is also arranged on the injection machine; in this embodiment, the position of the punch 81 during the process of pushing the molten metal in the cylinder is the extruding position of the molten metal injection cylinder 8, and the position sensor can know the position of the molten metal in the cylinder by detecting the position of the punch 81. The pressure stabilizing mechanism further comprises a controller (not shown in the figure), the controller is in signal connection with the position sensor, and the controller is used for responding to the signal of the position sensor and correspondingly controlling the three-position four-way valve 3; for example, in this embodiment, the controller mainly responds to two position signals of the position sensor, the first is a position signal when the punch 81 extrudes molten metal in the cylinder to move to block the molten metal injection port, at this time, the controller controls the three-position four-way valve 3 to move to the right position, the exhaust passage 13 is opened under the action of the oil pressure of the first energy storage device 4 and the system oil line of the die-casting mold, and then the cavity 10 is vacuumized; the second is a position signal when the punch 81 extrudes molten metal in the cylinder to enter the die cavity 10 of the die but does not reach the exhaust channel 13, and at the moment, the controller controls the three-position four-way valve 3 to move to the left position, and the exhaust channel 13 is rapidly closed under the action of the first energy storage device 4 and the oil pressure of a system oil path of the die-casting die.

In order to facilitate the assembly and disassembly of the first energy storage device 4, the pressure stabilizing mechanism further comprises an oil drain valve 9, an input pipe of the oil drain valve 9 is communicated with an output pipe 41 of the first energy storage device, and an output pipe of the oil drain valve 9 is connected to the oil return pipe 32 in parallel. In this embodiment, the oil drain valve 9 is a normally closed valve disposed on an oil path, and has a function of closing or opening an oil pipe; when the pressure stabilizing mechanism works normally, the oil drain valve 9 is in a normally closed state, and a pipeline for communicating the output pipe 41 of the first energy storage device with the oil return pipe 32 is closed, so that the oil pressure in the oil inlet pipe 31 and the output pipe 41 of the first energy storage device can be only transmitted to the direction of the three-position four-way valve 3. When the pressure stabilizing mechanism needs to be maintained and disassembled to the first energy storage device 4, the pressure of the first energy storage device 4 can be released outwards through the oil return pipe 32 by opening the oil drain valve 9, and the safety of the first energy storage device 4 during disassembly and assembly is greatly improved.

Claims

1. The pressure stabilizing mechanism of the casting mould is provided with an exhaust channel, and a vacuum valve for shutting off is arranged in the exhaust channel; the pressure stabilizing mechanism also comprises a main driving oil cylinder capable of driving the vacuum valve to perform opening and closing actions and a three-position four-way valve for controlling the actions of the main driving oil cylinder, wherein the main driving oil cylinder and the three-position four-way valve are connected with an oil path pipe A and an oil path pipe B, and the three-position four-way valve is also connected with an oil inlet pipe and an oil return pipe; the oil path pipe A is used for providing oil pressure for driving the vacuum valve to be opened for the main driving oil cylinder, and the oil path pipe B is used for providing oil pressure for driving the vacuum valve to be closed for the main driving oil cylinder; the oil inlet pipe is also connected with an output pipe of a first energy storage device in parallel, and the oil path pipe B is also connected with an output pipe of a second energy storage device in parallel.

2. The pressure stabilizing mechanism according to claim 1, further comprising an injection machine, wherein a molten metal output pipe of the injection machine is communicated with a pouring gate of the die, and a molten metal injection cylinder and a position sensor capable of synchronizing the extrusion position of the molten metal injection cylinder are arranged on the injection machine; the three-position four-way valve is connected with the position sensor through signals, and the controller is used for responding to the signals of the position sensor and correspondingly controlling the three-position four-way valve, the first energy storage device and the second energy storage device.

3. The pressure stabilizing mechanism according to claim 1, wherein a check valve is provided on the oil inlet pipe, the check valve being provided before a position where the oil inlet pipe is connected in parallel with the output pipe of the first energy storage device, the check valve being configured to allow external oil to enter the oil inlet pipe but to prevent the oil of the oil inlet pipe from flowing backward.

4. The pressure stabilizing mechanism according to claim 3, further comprising an oil drain valve, wherein an input pipe of the oil drain valve is communicated with an output pipe of the first energy storage device, and an output pipe of the oil drain valve is connected to the oil return pipe in parallel.