Oxygen filling device of die-casting die and feeding device applying oxygen filling device

Abstract

The oxygenating device of the die-casting die is arranged on a feeding pipe of a die to be assembled, and comprises an oxygenating mechanism arranged on an air inlet of the feeding pipe, the oxygenating mechanism comprises a spray head used for supplying oxygen, and the oxygenating device of the die-casting die is characterized in that a filtering assembly is detachably arranged in the oxygenating mechanism; and the filtering assembly is used for filtering molten aluminum drawn in from the spray head. The feeding device of the die-casting die comprises a feeding pipe which is provided with an air inlet and a feeding port and used for conveying molten aluminum and oxygen into a cavity; the oxygen filling device is characterized in that the oxygen filling device is applied, and the oxygen filling mechanism is arranged on the air inlet; and the injection head is used for blocking the air inlet and the feeding hole. A user can replace the filtering assembly regularly, so that the phenomenon of blockage in the oxygenation mechanism is avoided; a user only needs to regularly replace the filtering assembly and then the feeding device can continue to work, overall cleaning is not needed, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of accessories and parts for pressure casting, in particular to an oxygen injection device for an aluminum die-casting machine before aluminum molding. Background Art

[0002] Among aluminum products, some are formed by mechanically injecting molten aluminum into a designated mold and then cooling it. However, aluminum products processed by this traditional process will have small bubbles inside the aluminum, making the surface of the aluminum products less than smooth. In addition, bubble marks will be left on the surface of the product during reprocessing, making the aluminum surface of the product less than smooth and requiring additional polishing process to improve precision and smoothness, thereby increasing product costs.

[0003] In response to the above problems, some existing technologies have adopted oxygen-filled die-casting technology to reduce the number of pores in castings. For example, the Chinese utility model patent "An oxygen filling device for die-casting molds" with patent number ZL201620013091.7 (publication number CN205289702U) discloses the following technical solution: before the aluminum material is injected into the mold, oxygen is sprayed into the aluminum water injection pipe of the mold through a nozzle, and then the aluminum water is injected into the designated mold through the pipe for cooling and molding, thereby effectively reducing the generation of bubbles inside the molded aluminum material.

[0004] However, as the molten aluminum flows in the pipe, the oxygen ejected from the nozzle also flows at high speed above the molten aluminum. According to Bernoulli's principle, this will cause the molten aluminum to "roll up" or even be drawn into the oxygenating nozzle and deposited on the pipe wall of the oxygenating pipe. Over time, the oxygenating pipe will be blocked, causing the oxygen content in the feed pipe to decrease, and the air in the mold cavity cannot be fully discharged, resulting in two effects. First, the blockage of the oxygenating pipe will cause the air pressure in the pipe to increase, posing a safety hazard; second, if the oxygenating pipe is blocked, the feeding device integrated with it needs to be shut down for overall cleaning, affecting production efficiency. Utility Model Content

[0005] The first technical problem to be solved by the present invention is to provide an oxygenating device for a die-casting mold that can avoid blockage of an oxygenating pipeline in response to the above-mentioned existing technical status.

[0006] The second technical problem to be solved by the present invention is to provide a feeding device for a die-casting mold using the above-mentioned oxygenating device in response to the above-mentioned existing technical status.

[0007] The technical solution adopted by the present invention to solve the first technical problem is as follows: the oxygenating device of the die-casting mold is arranged on the feed pipe of the mold to be assembled, including an oxygenating mechanism arranged on the air inlet of the feed pipe, and the oxygenating mechanism includes a nozzle for supplying oxygen, which is characterized in that:

[0008] A filter assembly is detachably provided in the oxygenating mechanism, and the filter assembly is used to filter the aluminum liquid drawn in from the nozzle.

[0009] To facilitate user replacement of the filter assembly, the oxygenation mechanism further includes an oxygenation tube. Correspondingly, the filter assembly includes a tube body detachably connected between the nozzle and the oxygenation tube, and a filter element disposed within the tube body. At least two of the filter elements are spaced apart in the flow path between the oxygenation tube and the nozzle. Users can simply remove and install the tube body to complete the removal of the filter assembly between the nozzle and the oxygenation tube.

[0010] To extend the service life of the filter element, further, only two filters are provided, namely a first filter element and a second filter element. The first filter element and the second filter element each include a plate body and filter holes provided on the plate body. The ratio of the sum of the areas of the filter holes in the first filter element to the total area of ​​the plate body is 75% to 80%, while the ratio of the sum of the areas of the filter holes in the second filter element to the total area of ​​the plate body is 85% to 95%. The above arrangement ensures that the flow rate from the oxygenation pipe toward the nozzle through the first filter element is greater than the flow rate through the second filter element. As a result, aluminum chips that solidify into a larger area and flow backward into the oxygenation mechanism are blown back into the feed pipe. The first filter element is less likely to clog, while the second filter element has a larger filter area, which increases the probability of intercepting small particles of aluminum chips, thereby preventing aluminum chips from flying into the oxygenation pipe.

[0011] To enhance the filtration effectiveness of the filter assembly, the first filter element has a first filter hole, and the second filter element has a second filter hole. The first filter hole has a larger diameter than the second filter hole. This larger diameter prevents the first filter element from becoming clogged, maintaining an unobstructed air path between the tube and the nozzle. The solidified aluminum molten metal particles that initially filter through the first filter element have a smaller radius, so the smaller second filter hole allows the solidified aluminum slag to be trapped within the tube by the second filter element.

[0012] Furthermore, the ratio of the apertures of the first filter holes to the second filter holes is 1.5:1 to 2:1.

[0013] To effectively prevent molten aluminum from entering the oxygenation tube, the spacing between the first and second filter elements is 100 to 120 mm. This spacing corresponds to the maximum height of molten aluminum drawn into the tube during operation, ensuring that the molten aluminum is drawn into the tube and not into the oxygenation tube.

[0014] In order to facilitate users to set the filter element, further, the first filter element is arranged at the connection between the nozzle and the tube body, and the second filter element is arranged at the connection between the tube body and the oxygenation tube.

[0015] To ensure a stable connection between the nozzle, filter assembly, and oxygenation tube, a snap-fit ​​structure is further provided at each of the joints to achieve a detachable connection between the first and second filter elements. The snap-fit ​​structure applies pressure to the first and second filter elements, ensuring airtightness at the connection between the filter assembly, nozzle, and oxygenation tube.

[0016] The technical solution adopted by the present invention to solve the second technical problem is: the feeding device of the die-casting mold includes:

[0017] A feed pipe, the first end of which is in communication with the mold cavity of the mold to be assembled, and the feed pipe is provided with an air inlet and a feed inlet for conveying molten aluminum and oxygen into the mold cavity;

[0018] The invention is characterized in that: the above-mentioned oxygenating device is applied, and the oxygenating mechanism is arranged on the air inlet;

[0019] Also included are:

[0020] The injection head is movably arranged at the second end of the feed pipe and is driven by the press to move in the feed pipe to block the air inlet and the feed port.

[0021] To reduce user operation, the oxygenation mechanism is further equipped with an air valve that can control the on / off state of the oxygenation tube. The air valve is connected to a central control system, which can cooperate with sensors to determine the mold opening and closing state and the position of the injection head. The central control system is configured to open the air valve when the mold is in the closed state and close the air valve when the injection head blocks the air inlet. The central control system automatically controls the opening and closing of the air valve based on the mold opening and closing state and the position of the injection head, eliminating the need for manual judgment of the injection head's movement position and the mold opening and closing state.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] 1. The setting of the filter component can block the aluminum liquid that enters the nozzle, thereby avoiding the blockage in the oxygen filling mechanism;

[0024] 2. The connection between the filter assembly and the oxygenation mechanism is set to a detachable connection so that the staff can replace the filter assembly regularly;

[0025] 3. This utility model also provides a die-casting mold with an oxygenating device, so that the user only needs to replace the filter component regularly and the feeding device can continue to work without the need for overall cleaning, thereby improving production efficiency;

[0026] 4. Finally, the setting of the injection head to seal the feed port and the air inlet ensures the sealing of the feed pipe and the cavity, preventing air from mixing in and generating bubbles. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a cross-sectional view of the oxygenating device of the present invention when it is assembled on the feed pipe and the mold;

[0028] Figure 2 for Figure 1 A partial enlarged view of the assembly point between the oxygenation mechanism and the feed pipe;

[0029] Figure 3 This is a schematic structural diagram of the oxygenation mechanism of the present invention;

[0030] Figure 4 This is an exploded view of the structure of the oxygenation mechanism of the present invention;

[0031] Figure 5 It is a longitudinal cross-sectional view of the tube body of the present utility model;

[0032] Figure 6 This is a schematic structural diagram of the first filter element of the present invention;

[0033] Figure 7 This is a schematic structural diagram of the second filter element of the present invention;

[0034] Figure 8 This is a schematic structural diagram of the feeding device of the present utility model;

[0035] Figure 9 This is a schematic diagram of the assembly relationship between the feeding device and the mold of the utility model;

[0036] Figure 10 It is a longitudinal cross-sectional view of the feeding device of the present invention in a first state;

[0037] Figure 11 It is a longitudinal cross-sectional view of the feeding device of the present invention in the second state;

[0038] Figure 12 It is a longitudinal cross-sectional view of the feeding device of the present invention in the third state. DETAILED DESCRIPTION

[0039] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0040] like Figures 1 to 12The figure shows the best embodiment of the present invention. This oxygenation device is mainly used to fill the feed pipe with oxygen. During the process of filling the oxygen, due to the high air flow velocity, the aluminum liquid flowing in the feed pipe will be drawn into the oxygenation pipe and block the oxygenation pipe. Since the high-speed flow of oxygen requires the nozzle to be kept from leaving the air inlet, the nozzle is fixed to the air inlet of the feed pipe and is difficult to remove. This means that once the oxygenation pipe is blocked, the operator needs to clean both the feed pipe and the oxygenation pipe at the same time, which is quite troublesome. Therefore, it would be beneficial to provide an oxygenation device for a die-casting mold that can avoid blockage of the oxygenation pipe. The detailed structure of the oxygenation device for the die-casting mold will be described below:

[0041] See Figures 1 to 3 The oxygenation device of the die-casting mold is arranged on the feed pipe 2 of the mold 1 to be assembled, and includes an oxygenation mechanism 3 arranged on the air inlet 21 of the feed pipe 2, a filter component 32 for filtering the aluminum liquid drawn in from the nozzle 31, and the nozzle 31 for supplying oxygen. The filter component 32 is detachably arranged in the oxygenation mechanism 3.

[0042] The oxygenation mechanism 3 also includes an oxygenation tube 33. The filter assembly 32 includes a tube body 321 detachably connected between the nozzle 31 and the oxygenation tube 33 and a filter element 322 arranged in the tube body 321. At least two filter elements 322 are arranged at intervals in the flow path between the oxygenation tube 33 and the nozzle 31. The user can complete the disassembly of the filter assembly between the nozzle 31 and the oxygenation tube 33 by removing and installing the tube body 321. The action is simple and convenient for the user to replace the filter assembly 32.

[0043] See Figure 4 Only two filters 322 are provided: a first filter 323 and a second filter 324. Both the first filter 323 and the second filter 324 include a plate 320 and filter holes disposed therein. The ratio of the sum of the areas of the filter holes in the first filter 323 to the total area of ​​the plate 320 is 75%, while the ratio of the sum of the areas of the filter holes in the second filter 324 to the total area of ​​the plate 320 is 90%. This arrangement ensures that the flow rate from the oxygenation pipe 33 toward the nozzle through the first filter 323 is greater than the flow rate through the second filter 324. This allows aluminum chips that have solidified into a larger area and flowed backward into the oxygenation mechanism 3 but have not entered the filter assembly 32 to be blown back into the feed pipe 2. The first filter 323 is less likely to clog, while the second filter 324, with its larger filter area, is more likely to intercept small aluminum chips, preventing them from entering the oxygenation pipe 33 and extending the service life of the filter 322.

[0044] The key point in the design of the first filter element 323 and the second filter element 324 is that in addition to the ratio of the sum of the areas of the filter holes to the total area of ​​the plate 320, the pore size of each filter hole is also particularly important. For details, please refer to Figure 6 and Figure 7 The filter hole of the first filter element 323 is the first filter hole 3232, and the filter hole of the second filter element 324 is the second filter hole 3242. The aperture of the first filter hole 3232 is larger than that of the second filter hole 3242. The setting of the aperture of the first filter hole 3232 being larger than that of the second filter hole 3242 makes the first filter element 323 less likely to be blocked, and keeps the air path between the tube body 321 and the nozzle 31 unobstructed. The particle radius of the solidified aluminum liquid initially filtered by the first filter element 323 is relatively small, so the second filter hole 3242 adopts a smaller size so that the solidified aluminum slag is blocked by the second filter element 324 in the tube body, thereby increasing the filtering effect of the filter assembly 32. In addition, the aperture ratio of the first filter hole 3232 to the second filter hole 3242 is 2:1. See Figure 5 The distance between the first filter element 323 and the second filter element 324 is 120 mm. Since the first filter element 323 and the second filter element 324 are respectively arranged at the two ends of the tube body, the length L of the tube body 321 is also basically around 120 mm. The numerical range of this length L is the maximum height of the aluminum liquid rolled into the tube body tested in the actual process. In this way, it is ensured that the aluminum liquid is only rolled into the tube body 321 and does not enter the oxygen filling tube 33, thereby fully preventing the aluminum liquid from entering the oxygen filling tube 33.

[0045] See Figure 4 The first filter element 323 is located at the connection between the nozzle 31 and the tube body 321, while the second filter element 324 is located at the connection between the tube body 321 and the oxygenation tube 33. The first and second filter elements 323, 324 are located at either end of the tube body 321, respectively. This facilitates the user to remove the filter element 322 from both ends after removing the tube body 321, without having to remove the filter element 322 from the inside of the tube body 321. This also makes installation easier, reduces the risk of air leakage, and facilitates filter element 322 replacement. A snap-fit ​​structure 4 is provided at each connection to ensure a removable connection between the first and second filter elements 323, 324. This snap-fit ​​structure 4 applies pressure to the first and second filter elements 323, 324, ensuring airtightness at the connection between the filter assembly 32, the nozzle 31, and the oxygenation tube 33, thereby ensuring a stable connection between the nozzle 31, the filter assembly 32, and the oxygenation tube 33.

[0046] See Figure 4 and Figure 5The clamping structure 4 is clamped by the following structure, wherein the outer periphery of the first filter element 323 and the second filter element 324 are protruded along the length direction of the tube body 321 to form a protrusion 3221, and correspondingly, the inner walls of both ends of the tube body 321, the inner wall of the second end of the oxygenation tube 33 and the inner wall of the second end of the nozzle 31 are all recessed with a recessed portion 34, and the recessed portion 34 is adapted to the protrusion 3221, and the cooperative connection between the two limits the radial movement of the tube body 321 and the filter element 322, reducing the risk of the filter element 322 detaching from the tube body 321 and air leakage due to excessive air flow velocity, and at the same time, it also enhances the stability of the installation of the filter element 322 and the tube body 321, the nozzle 31 and the oxygenation tube 33.

[0047] In addition, the outer wall of the connection between the tube body 321, the nozzle 31 and the first filter element 323 also protrudes outward and is combined to form a first fitting portion 325, and the outer wall of the connection between the tube body 321, the oxygenation tube 33 and the second filter element 324 all protrude outward and are combined to form a second fitting portion 326, wherein the outer side of the first fitting portion 325 is clamped with the first clamping member 41, and the outer side of the second fitting portion 326 is clamped with the second clamping member 42. The setting of the first clamping member 41 and the second clamping member 42 applies pressure to the first filter element 323 and the second filter element 324 to ensure the airtightness of the connection between the filter assembly 32 and the nozzle 31 and the oxygenation tube 33, so that the connection between the nozzle 31, the filter assembly 32 and the oxygenation tube 33 is stable. Finally, the first mating portion 325 also includes a first sub-mating portion 3251 located at the second end of the nozzle 31 and a second sub-mating portion 3252 located at the first end of the tube body 321, and the second mating portion 326 also includes a third sub-mating portion 3261 located at the second end of the oxygenation tube 33 and a fourth sub-mating portion 3262 located at the second end of the tube body 321. The first clamping member 41 and the second clamping member 42 are both clamps, and the inner side of the clamp has a groove that cooperates with the first matching portion 325 and the second matching portion 326. When the first filter element 323 is clamped, the first sub-matching portion 3251 and the second sub-matching portion 3252 are first used to press the first filter element 323 along the length direction of the tube body 321, and then the first clamping member 41 is used to clamp the first matching portion 325 into the groove on the inner side of the first clamping member 41 and shrink inward along the radial direction of the tube body 321 to clamp the first filter element 323. At this point, the clamping action of the first filter element 323 is completed, and the clamping action of the second filter element 324 is the same as the clamping action of the first filter element 323. The working principle of the oxygenation device of the die-casting mold is as follows: after the aluminum liquid is drawn into the nozzle 31, it cools and turns into a series of aluminum slags of different sizes. These aluminum slags first pass through the first filter element 323 for preliminary filtration to filter out large-sized aluminum slags and are blown back into the aluminum liquid in the feed pipe 2 by the high-speed oxygen flow to re-melt or remain on the surface of the first filter element 323, while the second filter element 324 will block small particles of aluminum slag from entering the oxygenation pipe 33, so that small particles of aluminum slag remain in the pipe body 321; when the oxygenation device has been used a certain number of times, the user can avoid blockage in the oxygenation pipe 33 by removing the first clamping member 41 and the second clamping member 42 and replacing the filter assembly 32.

[0048] The oxygenation device of the die-casting mold can be used in the production of die-casting parts. It is usually connected to the feed pipe 2 as the feed device of the die-casting mold to introduce a certain proportion of oxygen and molten aluminum into the mold 1. The specific structure is as follows:

[0049] like Figures 8-12As shown, the feeding device is used to supply molten aluminum and oxygen to the cavity of the mold 1. The oxygen delivery time is generally controlled manually, which has low production efficiency and the risk of clogging the oxygen filling pipe. Therefore, it is beneficial to provide a feeding device for a die-casting mold with high production efficiency. The following will expand the detailed structural description of the feeding device of the die-casting mold:

[0050] See Figure 8 and Figure 9 The feeding device of the die-casting mold includes a feeding pipe 2, the above-mentioned oxygenating device and a shot head 5, wherein the first end of the feeding pipe 2 is connected to the cavity of the mold 1 to be assembled, and the feeding pipe 2 is provided with an air inlet 21 and a feeding port 22 for transporting aluminum liquid and oxygen into the cavity, and the oxygenating mechanism 3 is provided on the air inlet 21; the shot head 5 is movably provided at the second end of the feeding pipe 2, and is driven by the press to move in the feeding pipe 2 to block the air inlet 21 and the feeding port 22.

[0051] Oxygenation mechanism 3 is also equipped with an air valve that controls the on / off state of oxygenation tube 33. This air valve is connected to a central control system, which, in conjunction with sensors, determines the opening and closing state of mold 1 and the position of shot head 5. The central control system is configured to open the air valve when mold 1 is in the closed state and close it when shot head 5 blocks air inlet 21. The central control system automatically controls the opening and closing of the air valve based on the opening and closing state of mold 1 and the position of shot head 5, eliminating the need for manual determination of the motion position of shot head 5 and the opening and closing state of mold 1, thus reducing user effort.

[0052] The working process of the feeding device of this die-casting mold is as follows:

[0053] (1) Start oxygenation: The sensor detects that the mold 1 is closed, and the central control system opens the air valve to exhaust the air in the cavity and the feed pipe 2, and then adds aluminum liquid to the feed pipe 2 from the feed port 22. At this time, the feeding device is in Figure 10 The first state shown;

[0054] (2) Blocking the feed port 22: After the aluminum liquid stops flowing into the feed port 22, the press starts to push the shot head 5 from the second end of the feed pipe 2 to the first end until the feed port is blocked. At this time, the feeding device is in Figure 11 The second state shown;

[0055] (3) End of oxygenation: The injection head 5 continues to move toward the first section of the feed pipe 2. When the injection head 5 blocks the air inlet 21, it stops moving. The sensor detects the position of the injection head 5 and feeds it back to the central control system. The central control system closes the air valve to end the oxygenation action. At this time, the feed device is in Figure 12 The third state is shown.

Claims

1. An oxygenating device for a die-casting mold, arranged on a feed pipe (2) of a mold (1) to be assembled, comprising an oxygenating mechanism (3) arranged on an air inlet (21) of the feed pipe (2), the oxygenating mechanism (3) including a nozzle (31) for supplying oxygen, characterized in that: A filter assembly (32) is detachably provided in the oxygenating mechanism (3), and the filter assembly (32) is used to filter the aluminum liquid drawn in from the nozzle (31).

2. The oxygenation device according to claim 1, characterized in that: The oxygenation mechanism (3) further includes an oxygenation tube (33). Correspondingly, the filter assembly (32) includes a tube body (321) detachably connected between the nozzle (31) and the oxygenation tube (33) and a filter element (322) disposed within the tube body (321). At least two filter elements (322) are disposed at intervals in the flow path between the oxygenation tube (33) and the nozzle (31).

3. The oxygenation device according to claim 2, characterized in that: There are only two filter elements (322), namely a first filter element (323) and a second filter element (324). The first filter element (323) and the second filter element (324) both include a plate body (320) and filter holes arranged on the plate body (320). The ratio of the sum of the areas of the filter holes in the first filter element (323) to the total area of ​​the plate body (320) is 75% to 80%, while the ratio of the sum of the areas of the filter holes in the second filter element (324) to the total area of ​​the plate body (320) is 85% to 95%.

4. The oxygenation device according to claim 3, characterized in that: The filtering hole of the first filter element (323) is a first filtering hole (3232), the filtering hole of the second filter element (324) is a second filtering hole (3242), and the aperture of the first filtering hole (3232) is larger than that of the second filtering hole (3242).

5. The oxygenation device according to claim 4, characterized in that: The aperture ratio of the first filter hole (3232) to the second filter hole (3242) is 1.5:1 to 2:

1.

6. The oxygenation device according to any one of claims 3 to 5, characterized in that: The distance between the first filter element (323) and the second filter element (324) is 100 to 120 mm.

7. The oxygenation device according to any one of claims 3 to 5, characterized in that: The first filter element (323) is provided at the connection between the nozzle (31) and the tube body (321), and the second filter element (324) is provided at the connection between the tube body (321) and the oxygenation tube (33).

8. The oxygenation device according to claim 7, characterized in that: A snap-fit ​​structure (4) is provided on each of the connection points to achieve a detachable connection between the first filter element (323) and the second filter element (324).

9. A feeding device for a die-casting mold, comprising: A feed pipe (2), a first end of which is in communication with the mold cavity of the mold (1) to be assembled, and an air inlet (21) and a feed port (22) are provided on the feed pipe (2) for conveying molten aluminum and oxygen into the mold cavity; Its characteristics are: The oxygenating device according to any one of claims 1 to 8 is applied, wherein the oxygenating mechanism (3) is provided on the air inlet (21); Also included are: The injection head (5) is movably arranged at the second end of the feed pipe (2), and is driven by the press to move in the feed pipe (2) to block the air inlet (21) and the feed port (22).

10. The feeding device according to claim 9, characterized in that: The oxygenation mechanism (3) is further provided with an air valve capable of controlling the on / off state of the oxygenation pipe (33). The air valve is connected to a central control system. The central control system can cooperate with a sensor to determine the opening and closing state of the mold (1) and the position of the injection head (5). The central control system is configured to: open the air valve when the mold (1) is in a mold-closing state; and close the air valve when the injection head (5) blocks the air inlet (21).

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