Automation device for pot mold of aluminum alloy mold

By designing a mold automation device for multi-reaction chambers and lifting workpieces, the problem of low molding efficiency of existing aluminum alloy molds is solved, an efficient and automated molding process is achieved, and labor intensity and lye concentration control difficulty is reduced.

CN222758332UActive Publication Date: 2025-04-15GUANGDONG XINGFA ALUMINUM HENAN
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Patent Information

Application Number
CN202421468920.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-25
Publication Date
2025-04-15
Estimated Expiration
2034-06-25

AI Technical Summary

Technical Problem

The molding process of existing aluminum alloy molds is inefficient, and the molding of small molds needs to be sorted and re-elected after the molding is completed, which wastes time and reduces efficiency.

Method used

A mold automation device for aluminum alloy molds is designed, including multiple reaction chambers and lifting tools, so that each mold can be clamped and molded, reducing the lifting and sorting steps, and using an alkali liquid circulation circuit for easy concentration control.

Benefits of technology

It improves the efficiency and automation of the molding process, reduces the labor intensity of staff, and achieves better control of alkali concentration, avoiding the situation of too low concentration.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a pot mold automation device of an aluminum alloy mold, which comprises a hoisting mechanism, and the hoisting mechanism comprises a lifting hook capable of moving and lifting; a plurality of reaction bins are arranged in parallel in the working range of the hoisting mechanism; the shapes and the sizes of the hoisting tools and the reaction bins meet the requirement that one hoisting tool can be placed in one reaction bin; the upper portion of the lifting tool is provided with a lifting ring matched with the lifting hook, and the lower portion of the lifting tool is provided with a clamping space used for clamping a mold. According to the scheme, each die is independently clamped and stewed, the problem that an existing aluminum alloy extrusion die is low in stewed die efficiency is solved, the more efficient and automatic stewed die process is achieved, the overall production efficiency is improved, and the labor intensity of workers is reduced.
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Description

Technical Field

[0001] The utility model belongs to the technical field of mold burning, and in particular relates to an automatic mold burning device for aluminum alloy molds. Background Art

[0002] Mold burning is a commonly used processing technology for aluminum alloy profile extrusion molds (aluminum alloy molds for short). The existing mold burning process is to stack the molds in a rectangular mold frame, and the crane will lift the mold frame and put it into the mold burning tank for mold burning treatment. The concentration of the solution (such as sodium hydroxide solution) in the mold burning tank needs to be detected at regular intervals and points, and alkali solution is added to the tank according to the concentration to maintain the concentration required for mold burning. The current mold burning method cannot guarantee an efficient alkali solution concentration in the mold burning, resulting in a long mold burning time, and this mold burning method in which multiple molds are mixed in one mold burning tank will result in the small mold being completed, but the large mold is not yet completed, and needs to be hoisted out, sorted, and then hoisted back into the tank, which wastes time and is inefficient. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an automated die-burning device for aluminum alloy molds, solve the problem of low die-burning efficiency of existing aluminum alloy extrusion molds, achieve a more efficient and automated die-burning process, help improve overall production efficiency and reduce the labor intensity of workers.

[0004] According to the technical scheme of the utility model, the utility model provides an automated mold-making device for aluminum alloy molds, including a lifting mechanism, the lifting mechanism including a hook that can be moved and lifted; a plurality of reaction chambers are arranged in parallel within the working range of the lifting mechanism; it also includes a lifting tool, the shape and size of the lifting tool and the reaction chamber are such that one lifting tool can be placed in one reaction chamber; the upper part of the lifting tool has a lifting ring that is compatible with the hook, and the lower part of the lifting tool has a clamping space for clamping the mold.

[0005] Furthermore, the lifting tooling includes a load-bearing lifting block, a pull rod is provided below the load-bearing lifting block, the pull rod is arranged in two groups on both sides of the load-bearing lifting block, and a number of pins are connected between the two groups of pull rods; the two groups of pull rods and the number of pins together form a clamping space.

[0006] Furthermore, the pull rod is provided with a plurality of pin mounting holes distributed in the length direction, and the pin is detachably connected to the pull rod through the pin mounting holes.

[0007] Furthermore, each group of pull rods includes two pull rods, and the upper ends of the two pull rods are hinged to the load-bearing hanger block, and the two pull rods are connected at the middle and / or lower ends through a limit card; the limit card and the pull rod are detachably connected.

[0008] Furthermore, the load-bearing hanging block is provided with two clamping shafts which are distributed side by side in a transverse direction, and the upper end of the pull rod has a through hole and is sleeved on the clamping shaft to form a pivot connection.

[0009] Furthermore, the mold is cylindrical, the two sets of tie rods are respectively located on the outside of the two end faces of the mold, and the pins are distributed on the outside of the cylindrical side of the mold; the lower end of the tie rod forms a support foot, and there is a spacing distance between the lower end of the tie rod and the lower end of the mold.

[0010] Furthermore, the lifting mechanism includes a frame, the frame includes a column, a track is provided at the upper end of the column, a traveling mechanism is provided on the track, a lifting mechanism is provided on the traveling mechanism, and a hook is provided at the lower end of the lifting mechanism.

[0011] Furthermore, the reaction chamber has an openable and closable upper cover, and the upper cover is connected to an automatic opening and closing mechanism.

[0012] Furthermore, the upper cover is a flip cover hinged on one side, and the automatic opening and closing structure includes an upper cover opening mechanism and / or an upper cover rebound mechanism;

[0013] The upper cover opening mechanism includes a winding machine and a pull rope, and a pulley is arranged on the frame; one end of the pull rope is connected to the upper cover, and the other end of the pull rope is connected to the winding machine after passing through the pulley;

[0014] The upper cover rebound mechanism includes a pusher, which is movably connected to the reaction chamber or the frame and is connected to a reset spring; at least when the upper cover is opened, the pusher is in conflict with the upper cover.

[0015] Furthermore, a liquid inlet pipe is connected to the upper part of the reaction bin, and a liquid return pipe is connected to the lower part of the reaction bin. Control valves are provided on the liquid inlet pipe and the liquid return pipe. The liquid inlet pipe and the liquid return pipe are both connected to the alkali liquid container; the liquid inlet pipe, the liquid return pipe, the reaction bin and the alkali liquid container form an alkali liquid circulation loop.

[0016] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0017] 1. The aluminum alloy mold burning automation device of the utility model has multiple reaction chambers and lifting tools, which can realize the clamping and burning of each mold separately, thus eliminating the need for repeated lifting, sorting and other processes, and helping to improve work efficiency.

[0018] 2. The aluminum alloy mold automation device of the utility model adopts an innovatively designed lifting tooling, which has a simple structure, does not affect the mold making, and is convenient for lifting, placing and clamping the mold. It can also be applied to molds of various sizes and has good stability during clamping and placement.

[0019] 3. The aluminum alloy mold burning automation device of the utility model has a structure for mechanically controlling the opening and closing of the reaction chamber, thereby achieving a higher degree of automation as a whole and reducing the labor intensity of the staff.

[0020] 4. The aluminum alloy mold making automation device of the utility model has an alkali solution circulation loop, which makes it easier to control the alkali solution concentration and can avoid the situation where the alkali solution concentration is too low. There is no need to manually add alkali solution to each reaction chamber separately, which helps to further improve the automation level and efficiency of the mold making process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall main structure of the device according to one embodiment of the utility model.

[0022] Figure 2 yes Figure 1 A schematic side view of the overall structure of the device is shown.

[0023] Figure 3 yes Figure 1 A schematic diagram of the main structure of the lifting tool in the illustrated embodiment.

[0024] Figure 4 yes Figure 3 A schematic diagram of the side structure of the lifting tooling shown.

[0025] Figure 5 yes Figure 1 A schematic diagram of the main structure of the reaction chamber in the illustrated embodiment.

[0026] Figure 6 yes Figure 5 A schematic diagram of the side structure of the reaction chamber is shown.

[0027] Figure 7 yes Figure 1 The schematic diagram of the main structure of the embodiment shown is a state in which the lifting tool is placed in the reaction chamber.

[0028] Figure 8 yes Figure 5 A side view schematic diagram of the structure shown.

[0029] Description of reference numerals in the accompanying drawings:

[0030] 1. Hook; 2. Reaction chamber; 3. Lifting tool; 4. Lifting ring; 5. Mould; 6. Load-bearing lifting block; 7. Pull rod; 8. Pin; 9. Pin mounting hole; 10. Limit card; 11. Card shaft; 12. Column; 13. Track; 14. Travel mechanism; 15. Lifting mechanism; 16. Upper cover; 17. Winding machine; 18. Pull rope; 19. Pusher; 20. Reset spring; 21. Liquid inlet pipe; 22. Liquid return pipe; 23. Control valve; 24. Pulley; 25. Fixed plate; 26. Gasket; 27. Pin limiter; 28. Cross bar; 29. ​​Hinge. DETAILED DESCRIPTION

[0031] The utility model provides an automatic die-burning device for aluminum alloy molds, which solves the problem of low die-burning efficiency of existing aluminum alloy extrusion molds, realizes a more efficient and automated die-burning process, and helps to improve overall production efficiency and reduce labor intensity of workers.

[0032] See also Figure 1 , Figure 2 An automatic mold-burning device for aluminum alloy molds according to one embodiment of the utility model includes a lifting mechanism for lifting and moving molds to be burned and molds after burning. The lifting mechanism includes a hook 1 that can be moved and raised and lowered. Within the working range of the lifting mechanism (i.e., the area corresponding to the lifting, picking and placing operations of the hook 1), a plurality of reaction bins 2 are arranged in parallel. For example, the reaction bins 2 are regularly arranged on the ground, and the hook 1 can be moved to the top of each reaction bin 2 and perform lifting and lowering operations. It also includes a lifting tool 3. The shapes and sizes of the lifting tool 3 and the reaction bin 2 are such that one lifting tool 3 can be placed in one reaction bin 2. Figure 7 , Figure 8 As shown. The upper part of the lifting fixture 3 has a lifting ring 4 that matches the hook 1, and the lower part of the lifting fixture 3 has a clamping space for clamping the mold 5. The mold 5 can be stably positioned in the clamping space, so that it can be lifted and placed in and removed from the reaction chamber 2 with the lifting fixture 3. Of course, the lifting fixture 3 is a frame structure or a hollow structure, etc. In short, the alkali solution can fully contact the mold 5 in the lifting fixture 3, and the lifting fixture 3 will not affect the efficiency and effect of the mold burning process.

[0033] See also Figure 3 , Figure 4In a preferred embodiment, the lifting tool 3 includes a load-bearing hanging block 6, and a pull rod 7 is provided below the load-bearing hanging block 6. The pull rod 7 is provided in two groups on both sides of the load-bearing hanging block 6. A plurality of pins 8 are vertically connected between the two groups of pull rods 7, for example. The two groups of pull rods 7 and the plurality of pins 8 together enclose a clamping space. Taking the most common extrusion die as an example, the die 5 is cylindrical, and the two groups of pull rods 7 are respectively located on the outside of the two end faces of the die 5, and the pins 8 are distributed on the outside of the cylindrical side of the die 5, so that the die 5 can be placed on the pins 8, and the lifting tool 3 can limit the die 5 at least on the upper and lower sides and the front and rear sides; the clamping space does not require to completely fit the contour of the die 5, but at least in the case of shaking during the lifting process, for example, the die 5 will not fall out of the clamping space.

[0034] Further preferably, the pull rod 7 is provided with a plurality of pin mounting holes 9 distributed in the length direction (at least in the parts close to the upper end and the lower end). The pin 8 is detachably connected to the pull rod 7 through the pin mounting hole 9. For example, the main body of the pin 8 matches the size of the pin mounting hole 9. One end of the pin 8 is a head with a larger size, and the other end is provided with a pin stopper 27 (such as a snap ring or a split pin) after passing through the pin mounting hole 9. Thus, a set of lifting fixtures 3 can install the pin 8 at different positions according to the situation, change the clamping space, and be suitable for molds 5 of various sizes.

[0035] Further preferably, each group of tie rods 7 includes two tie rods 7, and the upper ends of the two tie rods 7 are hinged to the load-bearing hanger block 6, and the two tie rods 7 are connected at the middle and / or lower ends by a long limit card 10, so as to limit the angle between the two tie rods 7, that is, to limit the pin 8 so that it can stably support the mold 5. The limit card 10 and the tie rod 7 are detachably connected, for example, there are convex columns on the tie rod 7, and hooks are provided at both ends of the limit card 10; or Figure 3 As shown, one end of the limit card 10 is a hook, and the other end is movably connected to the pull rod 7; in other feasible embodiments, the limit card 10 adopts other buckle structures or plug-in structures to achieve detachable connection with the pull rod 7. In this solution, the two pull rods 7 can be opened, so the disassembly and assembly of the mold 5 is more convenient and quick; and by selecting limit cards 10 of different lengths, the angle between the two pull rods 7 can be adjusted, and then the setting mode of the pin 8 can be adjusted more flexibly, further increasing the types of molds that can be clamped by the lifting tool 3.

[0036] See also Figure 4An optional hinged connection method between the pull rod 7 and the load-bearing hanging block 6 is that two clamping shafts 11 are arranged side by side in a transverse direction on the load-bearing hanging block 6, and the upper end of the pull rod 7 has a through hole and is sleeved on the clamping shaft 11 to form a pivot connection. A fixing plate 24 is provided at the end of the clamping shaft 11 to limit the pull rod 7. A gasket 26 is also provided between the pull rod 7 and the load-bearing hanging block 6. This method has a simple structure and is easy to produce and assemble, and the two upper pins 8 are separated by a certain distance, which helps to stably position the mold 5. Optionally, the load-bearing hanging block 6 has a weighing function.

[0037] See also Figure 3 , and preferably, the pin mounting holes 9 on the two tie rods 7 of each group of tie rods 7 are symmetrically arranged, so that the four inserted pins 8 can form the four vertices of an isosceles trapezoid. The geometric structure of this isosceles trapezoid makes the four pins 8 necessarily cocircular, that is, the enclosed clamping space can be preferably suitable for the circular mold 5, and can ensure that the center of gravity of the mold 5 is also located in the middle, which is convenient for the process of lifting, etc. After being lifted and lowered by the lifting ring 4 above, the lifting tool 3 remains upright and can be placed stably. The lifting ring 4 is preferably located on the symmetry axis of the two tie rods 7 of each group of tie rods 7 and the symmetry axis of the two groups of tie rods 7, that is, the center position of the lifting tool 3. The lifting ring 4 can be optionally installed and fixed above the load-bearing hanging block 6; or in other embodiments, the lifting ring 4 is a part of the hollowed-out / integral molding on the load-bearing hanging block 6.

[0038] Please see again Figure 7 , Figure 8 The lower end of the pull rod 7 forms a support foot, and there is a spacing distance between the lower end of the pull rod 7 and the lower end of the mold 5, so that when placed on the ground or in the reaction chamber 2, the mold 5 is in a suspended state, which can avoid contamination of the surface of the mold 5. When the mold is burned, the mold 5 can be more fully in contact with the alkali solution, and space is left below for the circulation of the alkali solution and the falling aluminum material.

[0039] Please see again Figure 1 , Figure 2 The hoisting mechanism includes a frame, the frame includes a column 12, a track 13 is provided at the upper end of the column 12, a traveling mechanism 14 is provided on the track 13, a lifting mechanism 15 is provided on the traveling mechanism 14, and the lower end of the lifting mechanism 15 has a hook 1. The traveling mechanism 14 can be selected to perform only one-dimensional movement, or it can be selected to perform two-dimensional movement, corresponding to the arrangement of the reaction bin 2 below. Of course, the traveling mechanism 14 and the lifting mechanism 15 are also connected to a driving device, etc. The relevant XZ (front and back, lifting) moving mechanism or XYZ (front and back, left and right, lifting) moving mechanism and driving transmission structure, control method, etc. are easy to implement based on the existing technology, and will not be repeated here.

[0040] See also Figure 1 , Figure 2, Figure 5 , Figure 6 The reaction chamber 2 has an openable upper cover 16. The reaction chamber 2 is closed for mold making. The upper cover 16 is connected to an automatic opening and closing mechanism, which can cooperate with the above structure to realize the automation of the entire mold making process.

[0041] For example, the upper cover 16 is a flip cover structure hinged at one side, and the upper cover 16 is connected to the main body of the reaction chamber 2 through a hinge 29, for example. The automatic opening and closing structure includes an upper cover opening mechanism and / or an upper cover rebound mechanism.

[0042] The upper cover opening mechanism includes a winding machine 17 and a pull rope 18. A pulley 24 is provided on the frame (for example, on the cross bar 28 between the columns 12). The pulley 24 is a fixed pulley and is located obliquely above the hinge 29 of the upper cover 16. One end of the pull rope 18 is connected to the upper cover 16 (the end away from the hinge 29), and the other end of the pull rope 18 is connected to the winding machine 17 after passing through the pulley 24. Thus, the winding machine 17 drives the winding pull rope 18, and the upper cover 16 is pulled open. Of course, the design of the upper cover opening mechanism satisfies the requirement that the upper cover 16 can be opened at a sufficiently large angle so that the lifting tool 3 equipped with the mold can enter the reaction chamber 2 from top to bottom.

[0043] The upper cover rebound mechanism includes a pusher 19, which is movably connected to the reaction chamber 2 or the frame and is connected to a return spring 20. More specifically, the pusher 19 is located outside the hinge 29 of the reaction chamber 2. The pusher 19 is, for example, rod-shaped or frame-shaped, one end of which is hinged to the reaction chamber 2, and the other end has a rotatable roller to reduce friction. The middle of the pusher 19 is connected to a return spring 20, and the other end of the return spring 20 is connected to the reaction chamber 2. At least when the upper cover 16 is opened, after the upper cover 16 is opened, the pusher 19 (the roller at the free end) conflicts with the upper cover 16, and causes the return spring 20 to stretch; when the force provided by the winding machine 17 and the pull rope 18 to maintain the upper cover 16 in the open state disappears, the return spring 20 pulls the pusher 19 to return, and the pusher 19 pushes the upper cover 16 to close. It is understandable that, optionally, the pusher 19 (the roller at the free end) is always in conflict with the upper cover 16; but it is not limited to this, and it is optional that the pusher 19 pushes the upper cover 16 a sufficient distance and then the upper cover 16 is closed due to gravity or inertia.

[0044] Please see again Figure 1Preferably, the upper part of all reaction bins 2 is connected with a liquid inlet pipe 21, and the lower part of all reaction bins 2 is connected with a liquid return pipe 22. The liquid inlet pipe 21 and the liquid return pipe 22 are provided with a control valve 23 such as a solenoid valve. The liquid inlet pipe 21 and the liquid return pipe 22 are connected to the alkali liquid container, and the liquid inlet pipe 21, the liquid return pipe 22, the reaction bin 2 and the alkali liquid container form an alkali liquid circulation loop; of course, the alkali liquid circulation loop also includes a pump, a control system, etc. The relevant required structure and control method are easy to implement according to the prior art, and will not be described in detail here. After the present scheme reduces the mold-making groove to a reaction bin 2 used by a single mold, the solution concentration detection will be more dispersed, and in the present scheme, all small reaction bins 2 are connected together through pipelines, which reduces the difficulty of adjusting the solution concentration. And it can be considered to adopt a circulation method so that the solutions in all reaction bins 2 form a basically uniform whole. It is only necessary to regularly measure and ensure the solution concentration in a reaction bin 2 or an alkali liquid container, which is more convenient to achieve the control of the solution concentration under the requirements of efficient mold making.

[0045] In summary, the aluminum alloy mold burning automation device of the utility model has multiple reaction chambers and lifting fixtures, which can realize the clamping and burning of each mold separately, thus eliminating the need for repeated lifting, sorting and other processes, which helps to improve work efficiency. The lifting fixture with an innovative design has a streamlined structure, does not affect the mold burning, and is convenient for the process of lifting, placing and clamping the mold. It can also be applied to molds of various sizes, and has good stability during clamping and placement. It also has a structure for mechanically controlling the opening and closing of the reaction chamber, so that a higher degree of automation can be achieved as a whole, reducing the labor intensity of the staff. In addition, it also has an alkali solution circulation loop, which makes it easier to control the alkali solution concentration, can avoid the situation where the alkali solution concentration is too low, and does not require manual addition of alkali solution to each reaction chamber separately, which helps to further improve the automation level and efficiency of the mold burning process.

Claims

1. An automatic device for burning aluminum alloy molds, characterized in that: The invention comprises a lifting mechanism, wherein the lifting mechanism comprises a lifting hook (1) capable of being moved and lifted; a plurality of reaction chambers (2) are arranged in parallel within the working range of the lifting mechanism; and a lifting fixture (3) is also provided, wherein the shapes and sizes of the lifting fixture (3) and the reaction chamber (2) are such that one lifting fixture (3) can be placed in one reaction chamber (2); the upper part of the lifting fixture (3) comprises a lifting ring (4) matched with the lifting hook (1), and the lower part of the lifting fixture (3) comprises a clamping space for clamping a mold (5).

2. The aluminum alloy mold automation device according to claim 1, characterized in that: The lifting tool (3) comprises a load-bearing lifting block (6), a pull rod (7) is provided below the load-bearing lifting block (6), and the pull rod (7) is arranged in two groups on both sides of the load-bearing lifting block (6), and a plurality of pins (8) are connected between the two groups of the pull rods (7); the two groups of the pull rods (7) and the plurality of the pins (8) together enclose the clamping space.

3. The automatic mold making device for aluminum alloy mold according to claim 2 is characterized in that: The pull rod (7) is provided with a plurality of pin shaft mounting holes (9) distributed in the length direction, and the pin shaft (8) is detachably connected to the pull rod (7) via the pin shaft mounting holes (9).

4. The automatic mold making device for aluminum alloy mold according to claim 3 is characterized in that: Each group of the pull rods (7) comprises two pull rods (7), and the upper ends of the two pull rods (7) are hinged to the load-bearing hanger block (6), and the two pull rods (7) are connected at the middle and / or lower ends via a limit card (10); the limit card (10) and the pull rod (7) are detachably connected.

5. The automatic mold making device for aluminum alloy mold according to claim 4 is characterized in that: The load-bearing hanging block (6) is provided with two clamping shafts (11) which are distributed side by side in a transverse direction. The upper end of the pull rod (7) has a through hole and is sleeved on the clamping shafts (11) to form a pivot connection.

6. The automatic mold making device for aluminum alloy mold according to any one of claims 2 to 5, characterized in that: The mold (5) is cylindrical, the two groups of tie rods (7) are respectively located on the outside of the two end surfaces of the mold (5), and the pins (8) are distributed and located on the outside of the cylindrical side surface of the mold (5); the lower ends of the tie rods (7) form supporting feet, and there is a spacing distance between the lower ends of the tie rods (7) and the lower end of the mold (5).

7. The automatic mold making device for aluminum alloy mold according to any one of claims 1 to 5, characterized in that: The lifting mechanism comprises a frame, the frame comprises a column (12), a track (13) is provided at the upper end of the column (12), a travel mechanism (14) is provided on the track (13), a lifting mechanism (15) is provided on the travel mechanism (14), and the lower end of the lifting mechanism (15) has the lifting hook (1).

8. The automatic mold making device for aluminum alloy mold according to any one of claims 1 to 5, characterized in that: The reaction chamber (2) has an openable and closable upper cover (16), and the upper cover (16) is connected to an automatic opening and closing mechanism.

9. The automatic mold making device for aluminum alloy mold according to claim 8, characterized in that: The upper cover (16) is a flip cover hinged on one side, and the automatic opening and closing mechanism comprises an upper cover opening mechanism and / or an upper cover rebound mechanism; The upper cover opening mechanism comprises a wire winding machine (17) and a pull rope (18); the lifting mechanism comprises a frame, and a pulley (24) is arranged on the frame; one end of the pull rope (18) is connected to the upper cover (16), and the other end of the pull rope (18) is connected to the wire winding machine (17) after passing through the pulley (24); The upper cover rebound mechanism comprises a pushing member (19), the pushing member (19) being movably connected to the reaction chamber (2) or the frame and the pushing member (19) being connected to a return spring (20); at least when the upper cover (16) is in an open state, the pushing member (19) is in contact with the upper cover (16).

10. The automatic mold making device for aluminum alloy mold according to any one of claims 1 to 5, characterized in that: The upper part of the reaction chamber (2) is connected to a liquid inlet pipe (21), and the lower part of the reaction chamber (2) is connected to a liquid return pipe (22). The liquid inlet pipe (21) and the liquid return pipe (22) are both provided with control valves (23). The liquid inlet pipe (21) and the liquid return pipe (22) are both connected to an alkali liquid container. The liquid inlet pipe (21), the liquid return pipe (22), the reaction chamber (2) and the alkali liquid container form an alkali liquid circulation loop.