A pumping system for a high vacuum die casting mold

Abstract

The utility model relates to a kind of air extraction system for high vacuum die casting mould, including ordinary exhaust block body, the bottom of the ordinary exhaust block body is equipped with connecting seat, hydraulic vacuum valve body is fixedly installed in the inside of the connecting seat.This air extraction system for high vacuum die casting mould, when starting to extract vacuum, hydraulic system starts to work, pressure is exerted to hydraulic vacuum valve body, so that it opens, vacuum extraction equipment starts to run, generates negative pressure, the tiny passage formed by first exhaust plate and second exhaust plate flows to hydraulic vacuum valve body, at this time, hydraulic vacuum valve body keeps open state, allowing gas to enter vacuum extraction equipment smoothly, with the continuous discharge of gas, the pressure in system gradually reduces, reaches the required vacuum degree, 20mbar below, finally, hydraulic vacuum valve and vacuum extraction equipment continue to work, maintain the vacuum state of system, when system reaches predetermined vacuum degree or the end of vacuum extraction time, hydraulic system releases pressure, so that hydraulic vacuum valve body closes.

Description

Technical Field

[0001] This utility model relates to the field of vacuum extraction technology in die casting, specifically to an extraction system for high-vacuum die casting molds. Background Technology

[0002] The die casting industry has been able to achieve scale in a relatively short period of time, and die casting products have entered ordinary households. This is mainly due to the high efficiency of die casting production, which greatly reduces production costs. However, die casting has its inherent defects - the high gas content inside the casting makes it unable to compete with other processes in terms of structural strength.

[0003] To thoroughly remove gas from the mold cavity, die-casting pioneers developed vacuum die-casting, but in existing vacuum die-casting methods, vacuuming has significant drawbacks.

[0004] The disadvantages of commonly used vacuuming methods are as follows: 1. Hydraulic method: The system stops vacuuming before the fast injection begins. Because the vacuum is shut off in advance, it is not possible to inject and vacuum at the same time, resulting in poor performance. 2. Conventional venting block method: The vacuuming speed is limited by the wide, thin, and constantly changing "Z"-shaped vacuuming channel, resulting in an extremely low rate of increase in the vacuum level of the mold cavity. Therefore, a venting system for high-vacuum die-casting molds is proposed to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a vacuum system for high-vacuum die-casting molds, which has the advantage of good vacuuming effect. It solves the problems of existing vacuuming methods, such as hydraulic methods, where the system stops vacuuming before the start of fast injection, resulting in poor effect due to premature vacuum shut-off, and ordinary exhaust block methods, where the vacuuming speed is limited by the wide, thin, and constantly changing "Z"-shaped vacuuming channel, resulting in extremely low speed of cavity vacuum improvement.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a vacuum system for high vacuum die-casting molds, comprising a common exhaust block body, characterized in that: a connecting seat is installed at the bottom of the common exhaust block body, and a hydraulic vacuum valve body is fixedly installed inside the connecting seat.

[0007] Furthermore, the ordinary exhaust block body includes a first exhaust plate, a second exhaust plate, a first interface, and a second interface. The second exhaust plate is installed inside the first exhaust plate. The first interface is opened at the top of the first exhaust plate, and the second interface is opened at the bottom of the first exhaust plate.

[0008] Furthermore, the hydraulic vacuum valve body includes a valve sleeve and a valve stem.

[0009] Furthermore, the valve sleeve is connected to the connecting seat.

[0010] Furthermore, a valve stem is movably mounted inside the valve sleeve.

[0011] Furthermore, the second interface is connected to the connector.

[0012] Furthermore, the number of the second exhaust plates is no less than ten.

[0013] Furthermore, the first exhaust plate and the second exhaust plate are interwoven to form narrow channels.

[0014] Furthermore, the first interface (103) is used to connect to an external vacuum pumping device.

[0015] Furthermore, the connecting seat has a cavity body inside, and the second interface (104) is connected to the cavity body of the connecting seat.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. This evacuation system for high vacuum die-casting molds effectively solves the problem of premature evacuation of the hydraulic vacuum valve body and subsequent inability to vent air by connecting the ordinary evacuation block body to the hydraulic vacuum valve body, while also solving the problem of low evacuation efficiency of the evacuation block body.

[0017] 2. This evacuation system for high vacuum die-casting molds utilizes a combination of exhaust blocks and vacuum valves to quickly reduce the vacuum level inside the mold cavity to below 20 mbar. Simultaneously, it can continuously evacuate air to prevent back pressure generated during injection. By using this system, our company's 2800T three-in-one shells have achieved a pass rate of over 99%. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a partial front view schematic diagram of the present invention; Figure 4 This is a schematic diagram of the air extraction control system of this utility model.

[0019] In the figure: 1 ordinary exhaust block, 101 first exhaust plate, 102 second exhaust plate, 103 first interface, 104 second interface, 2 connecting seat, 3 hydraulic vacuum valve body, 301 valve sleeve, 302 valve stem, 4 cavity body. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 The air extraction system for high vacuum die casting mold in this embodiment includes a common exhaust block body 1, a connecting seat 2 installed at the bottom of the common exhaust block body 1, and a hydraulic vacuum valve body 3 fixedly installed inside the connecting seat 2.

[0022] exist Figure 1 and Figure 2 In the ordinary exhaust block body 1, there are a first exhaust plate 101, a second exhaust plate 102, a first interface 103 and a second interface 104. The second exhaust plate 102 is installed inside the first exhaust plate 101. The first interface 103 is opened on the top of the first exhaust plate 101 and the second interface 104 is opened on the bottom of the first exhaust plate 101.

[0023] Specifically, the first exhaust plate 101 and the second exhaust plate 102 are arranged in a crisscross pattern to form a tortuous and narrow channel. After the aluminum liquid enters this tortuous and narrow gap, it solidifies quickly. At this time, the die-casting mold is isolated from the outside gas. At this time, the vacuum control machine is still performing vacuuming action, which can effectively solve the problem of product porosity defects caused by the vacuum valve closing too early.

[0024] exist Figure 1 and Figure 2 In the middle, the hydraulic vacuum valve body 3 includes a valve sleeve 301 and a valve stem 302. The valve sleeve 301 is connected to the connecting seat 2, and the valve stem 302 is movably installed inside the valve sleeve 301.

[0025] Specifically, the controller drives the valve stem 2 to move via the cylinder, thereby controlling the opening and closing of the hydraulic vacuum valve body 3 to complete the work of evacuation and exhaust. When the valve stem 302 moves forward, there is a gap between it and the valve sleeve 301, and the evacuation channel is opened. Alternatively, when the valve stem 302 moves backward, there is no gap between it and the valve sleeve 301, and the evacuation channel is closed.

[0026] exist Figure 1 and Figure 3 In the middle, the second interface 104 is connected to the connecting seat 2, and the number of second exhaust plates 102 is not less than ten.

[0027] Specifically, the second interface 104 is connected to the cavity body 4, which facilitates air extraction and exhaust. When the hydraulic vacuum valve body 3 is closed, the ordinary exhaust block body 1 continues to exhaust air, thereby ensuring higher air extraction efficiency.

[0028] exist Figure 2 and Figure 3 In the middle, the first exhaust plate 101 and the second exhaust plate 102 are interwoven to form small channels.

[0029] Specifically, the narrow channels allow the molten aluminum to solidify rapidly, facilitating the rapid die casting of another part.

[0030] exist Figure 2 and Figure 3 In the middle, the first interface (103) is used to connect to the external vacuum equipment, the inside of the connecting seat 2 is provided with a cavity body 4, and the second interface (104) is connected to the cavity body 4 of the connecting seat 2.

[0031] During implementation, the following steps are followed: In the initial state, the combined pumping device is in standby mode, the hydraulic vacuum valve body 3 is closed, and the exhaust block body 1 is ready to receive the discharged gas. When vacuuming is started, the hydraulic system begins to work, applying pressure to the hydraulic vacuum valve body 3 to open it. At the same time, the vacuuming equipment, such as a vacuum pump, starts to operate, generating negative pressure. Under the action of negative pressure, the gas in the system flows to the hydraulic vacuum valve body 3 through the small channel formed by the first exhaust plate 101 and the second exhaust plate 102 in the exhaust block body 1. At this time, the hydraulic vacuum valve body 3 remains open, allowing the gas to smoothly enter the vacuuming equipment. As the gas is continuously discharged, the pressure in the system gradually decreases, reaching the required vacuum level, below 20 mbar. Finally, the hydraulic vacuum valve and the vacuuming equipment continue to work to maintain the vacuum state of the system. When the system reaches the predetermined vacuum level or the vacuuming time ends, the hydraulic system releases pressure, causing the hydraulic vacuum valve body 3 to close, the vacuuming equipment to stop operating, and the combined pumping device enters standby mode.

[0032] In summary, by setting up a conventional exhaust block body 1, the first exhaust plate 101 and the second exhaust plate 102 are arranged in a crisscross pattern to form a tortuous and narrow channel. After the molten aluminum enters this tortuous and narrow gap, it solidifies rapidly. At this time, the die-casting mold is isolated from the external gas. At this time, the vacuum control machine is still performing vacuuming. This can effectively solve the problem of product porosity defects caused by premature closure of the vacuum valve. By setting up a hydraulic vacuum valve body 3, the controller drives the valve rod 2 to move through the cylinder, thereby controlling the opening and closing of the hydraulic vacuum valve body 3 to complete the work of evacuation and venting. When the valve rod 302 moves forward, there is a gap with the valve sleeve 301, and the evacuation channel is opened. Or when the valve rod 302 moves backward, there is no gap with the valve sleeve 301, and the evacuation channel is closed. The second interface 104 is connected to the cavity body 4, which facilitates evacuation and venting. When the hydraulic vacuum valve body 3 is closed, the conventional exhaust block body 1 continues to vent, thereby ensuring higher evacuation efficiency. Through the narrow channel, the molten aluminum can solidify rapidly, which facilitates the rapid die-casting of another casting.

[0033] All electrical components mentioned in this article are connected to external controllers and 220V AC mains power. The controllers can be conventional known devices such as computers. The specific models and specifications of each device mentioned in this article need to be selected and determined according to the actual specifications of the device. The specific selection and calculation methods adopt existing technologies in this field, so they will not be described in detail here.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pumping system for high vacuum die casting moulds comprising a common exhaust block body (1), characterized in that: The bottom of the ordinary exhaust block body (1) is equipped with a connecting seat (2), and the hydraulic vacuum valve body (3) is fixedly installed inside the connecting seat (2).

2. A pumping system for a high vacuum die casting mold according to claim 1, characterized in that: The ordinary exhaust block body (1) includes a first exhaust plate (101), a second exhaust plate (102), a first interface (103), and a second interface (104). The second exhaust plate (102) is installed inside the first exhaust plate (101). The first interface (103) is opened on the top of the first exhaust plate (101), and the second interface (104) is opened on the bottom of the first exhaust plate (101).

3. A pumping system for a high vacuum die casting mold according to claim 1, characterized in that: The hydraulic vacuum valve body (3) includes a valve sleeve (301) and a valve stem (302).

4. A pumping system for a high vacuum die casting mold according to claim 3, characterized in that: The valve sleeve (301) is connected to the connecting seat (2).

5. A pumping system for a high vacuum die casting mold according to claim 3, characterized in that: The valve stem (302) is movably mounted inside the valve sleeve (301).

6. A pumping system for a high vacuum die casting mold according to claim 2, characterized in that: The second interface (104) is in communication with the connector (2).

7. A pumping system for a high vacuum die casting mold according to claim 2, characterized in that: The number of the second exhaust plates (102) is not less than ten.

8. A pumping system for a high vacuum die casting mold according to claim 2, characterized in that: The first exhaust plate (101) and the second exhaust plate (102) are interwoven to form small channels.

9. A pumping system for a high vacuum die casting mold according to claim 2, characterized in that: The first interface (103) is used to connect to an external vacuum pumping device.

10. A pumping system for a high vacuum die casting mold according to claim 2, characterized in that: The connecting seat (2) has a cavity body (4) inside, and the second interface (104) is connected to the cavity body (4) of the connecting seat (2).

Images