A silicon sol shell-making nozzle cup cover plate dismounting automatic ejection device

Abstract

The utility model relates to a kind of automatic ejection device of silicon sol shell-making pouring cup cover plate disassembly. The utility model includes lifting appliance hook, cover plate fixed nut, pouring cup cover plate, spring ejection device and pre-buried nut, and the lower part of lifting appliance hook is provided with external thread, lifting appliance hook passes through cover plate fixed nut, pouring cup cover plate and spring ejection device in sequence, and the lower end of lifting appliance hook is threadedly connected between the thread hole of pre-buried nut. The utility model realizes automatic ejection when pouring cup cover plate disassembly, solves the problem that manual knocking is needed when pouring cup cover plate disassembly, reduces workload and saves labor cost, improves production efficiency and yield.

Description

Technical Field

[0001] This utility model belongs to the field of investment casting shell making technology, and in particular relates to an automatic ejection device for the pouring cup cover plate when the wax pattern lifting tool is removed after shell making. Background Technology

[0002] In silica sol investment casting, the wax pattern needs to be mounted on a wax pattern lifting device so that it is suspended on the shell-making chain during the shell-making process. Simultaneously, the upper surface of the pouring cup needs to be open so that the molten metal can enter through it during pouring. Therefore, no shell is needed for the wax pattern itself; instead, a cover plate is used to cover the upper surface of the pouring cup. During shell-making, the wax pattern needs to be dipped in slurry, sprinkled with sand, and dried repeatedly. During each dipping and sand sprinkling process, some slurry may adhere to the pouring cup cover plate. The upper surface of the cover plate can be scraped off with a scraper. However, some coating remains on the lower edge of the cover plate and in the joint between the cover plate and the upper surface of the pouring cup, creating a bond with a certain strength. After shell-making, when removing the lifting device and taking off the pouring cup cover plate, it cannot be easily removed; usually, the lower edge of the pouring cup cover plate needs to be tapped to remove it. In actual production, disassembling the lifting fixtures and cover plates usually requires the cooperation of 2 to 3 people. One person disassembles and removes the hook, while another 1 to 2 people remove the cover plate. This increases labor costs, labor intensity, and workload. Furthermore, manually striking the cover plate can easily cause the pouring cup mold shell to crack. In severe cases, the mold shell may become unusable, reducing production efficiency and mold shell yield. Utility Model Content

[0003] The purpose of this invention is to provide an automatic ejection device for disassembling the pouring cup cover plate when the silica sol casting shell is manually made. This device automatically ejects the pouring cup cover plate during disassembly, solving the problem of needing to manually knock it during disassembly, reducing workload and saving labor costs, and improving production efficiency and yield.

[0004] The technical solution of this utility model is as follows: This utility model is an automatic ejection device for disassembling and ejecting the cap plate of a silica sol casting cup. Its special feature is that the automatic ejection device for disassembling and ejecting the cap plate of a silica sol casting cup includes a lifting hook, a cap plate fixing nut, a casting cup cap plate, a spring ejection device, and a pre-embedded nut. The lower part of the lifting hook is provided with an external thread. The lifting hook passes through the cap plate fixing nut, the casting cup cap plate, and the spring ejection device in sequence. The lower end of the lifting hook is threadedly connected to the threaded hole of the pre-embedded nut.

[0005] Furthermore, the spring ejection device includes a spring and two annular washers, which are respectively disposed at both ends of the spring, and the lifting hook passes through the two annular washers and the spring.

[0006] Furthermore, the pre-embedded nut has a round upper end, a cylindrical middle end, and a rectangular lower end.

[0007] Furthermore, the annular gasket has a thickness of 2-3 mm, an inner diameter of Φ12-15 mm, and an outer diameter of Φ20-25 mm; the spring has an outer diameter of Φ18-22 mm and a length of 60-70 mm.

[0008] Furthermore, the upper circular diameter of the pre-embedded nut is Φ25~30mm, the thickness is 2~3mm, the middle cylindrical diameter is Φ12~15mm, the height is 25~30mm, and the lower rectangular width is 14~16mm, the length is 30~35mm, and the thickness is 2~3mm.

[0009] Furthermore, a threaded hole is provided at the center of the pre-embedded nut, the threaded hole having a depth of 25-30mm and an outer diameter of 10-12mm.

[0010] Furthermore, the annular washer and the embedded nut are made of stainless steel.

[0011] Furthermore, the lower end of the pre-embedded nut is fixed on the mold positioning pin and pre-embedded in the wax pattern of the pouring cup.

[0012] This utility model provides an automatic ejection device for disassembling the pouring cup cover plate in silica sol molding. Based on traditional wax pattern module lifting tools, it adds a spring ejection device directly to the pre-embedded nut and pouring cup cover plate. During wax pattern module assembly, the fixing nut, pouring cup cover plate, and spring ejection device are sequentially inserted into the threaded end of the hook. The threaded end of the hook is then tightened into the threaded hole of the pre-embedded nut. The cover plate fixing nut is manually tightened with a wrench until the pouring cup cover plate is tightly against the upper surface of the pouring cup. At this point, the spring of the spring ejection device is under compression. After the shell is formed, during disassembly, the fixing nut of the cover plate is manually loosened with a wrench. As the nut moves upward, the ejection force released by the compressed spring pushes the pouring cup cover plate upward, achieving automatic detachment. Therefore, this utility model has the following advantages:

[0013] 1) This utility model adds a spring ejection device to the threaded end of the hook of the traditional wax pattern mold lifting tool, which is installed between the pre-embedded nut and the pouring cup cover plate. During installation, after tightening the cover plate fixing nut, the spring is subjected to compressive force. After the shell is made, when disassembling the lifting tool, the fixing nut of the cover plate is loosened, and under the action of the compressive spring ejection force, the pouring cup cover plate is automatically separated from the wax pattern mold. This greatly reduces the labor intensity and workload of manual disassembly in production, greatly improves the disassembly efficiency of the wax pattern lifting tool, reduces labor costs, and improves work efficiency.

[0014] 2) This utility model has low manufacturing cost, is easy to install, and can be reused. During disassembly, the entire wax pattern module lifting device can be removed as a whole, saving workers' operation steps. At the same time, it reduces the probability of mold shell breakage and damage caused by manually knocking off the pouring cup cover plate, thereby reducing production costs and improving the mold shell yield. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the spring ejection device of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the embedded nut of this utility model;

[0018] Figure 4 This is a schematic diagram of the pre-embedded nut in the pouring cup in an application embodiment of this utility model;

[0019] Figure 5 This is a schematic diagram of the spring in a compressed state in an application embodiment of this utility model;

[0020] Figure 6 This is a schematic diagram of the spring extending and ejecting the pouring cup cover plate in an application embodiment of this utility model.

[0021] The annotations in the figure are explained as follows:

[0022] 1. Hanger hook; 2. Cover plate fixing nut; 3. Sprue cup cover plate; 4. Spring ejection device; 5. Embedded nut; 6. Sprue cup wax pattern. Detailed Implementation

[0023] The overall scheme of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] See Figure 1 The present invention includes a lifting hook 1, a cover plate fixing nut 2, a pouring cup cover plate 3, a spring ejection device 4, and a pre-embedded nut 5. The lower part of the lifting hook 1 is provided with an external thread. The lifting hook 1 passes through the cover plate fixing nut 2, the pouring cup cover plate 3, and the spring ejection device 4 in sequence. The lower end of the lifting hook 1 is threadedly connected to the threaded hole of the pre-embedded nut 5.

[0025] See Figure 2 The spring ejection device 4 of this utility model, in a specific embodiment, consists of one spring and two annular washers. The annular washers are made of stainless steel, with a thickness of 2-3 mm, an inner diameter of Φ12-15 mm, and an outer diameter of Φ20-25 mm. The spring has an outer diameter of Φ18-22 mm and a length of 60-70 mm. The annular washers are welded and fixed to both ends of the spring, allowing them to move up and down as the spring contracts or extends. The lifting hook 1 passes through the two annular washers and the spring.

[0026] See Figure 3The embedded nut 5 of this utility model is made of stainless steel, with a circular upper end, a cylindrical middle end, and a rectangular lower end. The upper circular end has a diameter of Φ25-30mm and a thickness of 2-3mm. The middle cylindrical end has a diameter of Φ12-15mm and a height of 25-30mm. The lower rectangular end has a width of 14-16mm, a length of 30-35mm, and a thickness of 2-3mm. A threaded hole with a depth of 25-30mm and an outer diameter of 10-12mm is machined in the center of the embedded nut 5.

[0027] See Figure 4 —6. In this utility model, during wax pressing, the rectangular lower end of the pre-embedded nut 5 is fixed to the mold positioning pin. During wax pressing, it is pre-embedded in the wax pattern 6 of the pouring cup, so that the upper surface of the circular upper end is exposed and flush with the bottom surface of the internal cavity of the pouring cup. The disassembly process of the pouring cup cover plate 3 is as follows:

[0028] 1) Assemble the fixing cover nut 2, the pouring cup cover plate 3, and the spring ejection device 4 in sequence on the threaded end of the lifting hook 1 of the wax pattern module. The upper annular washer of the spring ejection device 4 rests on the lower plane of the pouring cup cover plate 3, and the lower annular washer presses on the upper circular plane of the pre-embedded nut 5.

[0029] 2) During installation, first rotate the lifting hook 1 to tighten the threaded end of the lifting hook 1 with the pre-embedded nut 5. Then, use a wrench to manually tighten the fixing cover nut 2 so that the lower surface of the pouring cup cover 3 is in close contact with the upper surface of the pouring cup. At the same time, as the fixing cover nut 2 is tightened, the spring is in a compressed state, completing the assembly of the wax pattern module lifting fixture.

[0030] 3) When applying slurry to the wax pattern mold and then applying sand, use a scraper to manually remove the slurry from the upper surface of the pouring cup cover plate 3 so that the upper surface is not shelled.

[0031] 4) After the shell is made, use a wrench to manually loosen the fixing cover nut 2. As the fixing cover nut 2 loosens, the pouring cup cover 3 will automatically separate from the pouring cup under the action of the spring top force.

[0032] 5) Rotate the lifting hook 1 to disengage the lifting hook 1 from the pre-embedded nut 5, and remove the entire set of wax pattern module lifting tools.

[0033] The beneficial effects of this utility model will be further illustrated below with reference to specific application embodiments.

[0034] Application Example 1: In the existing process of producing a ring shell using silica sol investment casting, a traditional wax pattern mold lifting fixture is used. After the shell-making process is completed, the lower edge of the pouring cup cover and the gap between the wax pattern and the pouring cup cover are covered with shell coating. Due to the adhesiveness of the silica sol in the coating, a bonding coating with a certain strength is formed. When disassembling the lifting fixture, one operator needs to manually loosen the nut with a wrench, then rotate the hook to remove it first, and then another operator uses a hammer to gently tap different positions on the lower edge of the pouring cup cover to detach the cover. It is estimated that disassembling 100 shell shell lifting fixtures requires two operators and takes 2 hours.

[0035] By adopting this utility model and adding an automatic ejection device for the pouring cup cover, the disassembly of 100 sets of mold shell lifting fixtures for the same product can be completed by one operator using only a wrench to manually tighten or loosen the cover nut 2. The pouring cup cover 3 will then automatically eject, and the lifting hook 1 can be rotated to disengage it from the pre-embedded nut 5, thus completing the disassembly of the entire mold shell lifting fixture. Statistics show that disassembling 100 sets of mold shell lifting fixtures requires one operator and takes one hour. This significantly reduces the workload of cover plate disassembly, lowers labor costs, and improves production efficiency.

[0036] Application Example 2: When producing flange shells using silica sol investment casting, traditional wax pattern mold lifting tools are used to produce 100 mold shells. After the shell production process is completed, during the disassembly of the lifting tooling, the pouring cups of 3 mold shells are broken and the edges of 4 pouring cups are damaged during the knocking of the cover plate. The scrap rate of 7% is caused by disassembling the wax pattern mold pouring cup cover plate.

[0037] By adopting this utility model and adding an automatic ejection device for the pouring cup cover, 100 pieces of mold shell lifting fixtures for the same product were disassembled, and 95 pieces of the pouring cup cover were automatically ejected by springs. Five pieces were loosened by the spring ejection force and could be removed by gently shaking them by hand. No breakage or damage to the pouring cup was caused during the disassembly of the wax pattern pouring cup cover. The scrap rate was 0% during the disassembly of the pouring cup cover of the wax pattern module, improving the mold shell yield and ensuring the stability of mold shell quality.

[0038] Application Example 3: In the existing silica sol investment casting process for producing a certain type of shell, the shell castings are relatively large, with a total weight of approximately 80 kg after completion. Using traditional wax pattern lifting tools, after the shell-making process, disassembly requires one operator to manually loosen the nuts with a wrench and then rotate the lifting hook to remove it. When disassembling the pouring cup cover, because it requires striking from the lower end of the cover, one operator needs to assist in tilting the mold shell, and another operator uses a hammer to gently tap the lower edge of the pouring cup cover to detach it. This operation is quite difficult and physically demanding for the workers. Statistics show that disassembling 50 mold shells requires 3 operators and takes 1 hour.

[0039] By employing this invention, 50 pieces of the same product mold shell lifting fixture can be disassembled. One operator manually tightens and loosens the cover plate nut 2 using a wrench, causing the pouring cup cover plate 3 to automatically eject. Then, the lifting hook 1 is rotated to disengage it from the pre-embedded nut 5, thus completing the disassembly of the entire wax pattern lifting fixture. Statistics show that disassembling 50 pieces of the mold shell lifting fixture requires one operator and takes one hour. This significantly reduces the difficulty and labor intensity for workers and improves operational convenience.

[0040] The content of this utility model and the technical content not specifically described in the above embodiments are the same as the prior art.

[0041] The above are merely specific embodiments disclosed in this utility model, but the scope of protection disclosed in this utility model is not limited thereto. The scope of protection disclosed in this utility model shall be determined by the scope of protection of the claims.

Claims

1. An automatic ejection device for disassembling and ejecting the cap plate of a silica sol casting cup, characterized in that: The automatic ejection device for disassembling the sprue cup cover plate of the silica sol shell making includes a lifting hook, a cover plate fixing nut, a sprue cup cover plate, a spring ejection device, and a pre-embedded nut. The lower part of the lifting hook is provided with an external thread. The lifting hook passes through the cover plate fixing nut, the sprue cup cover plate, and the spring ejection device in sequence. The lower end of the lifting hook is threadedly connected to the threaded hole of the pre-embedded nut.

2. The automatic ejection device for disassembling the cover plate of the silica sol casting cup according to claim 1, characterized in that: The spring ejection device includes a spring and two annular washers, which are respectively disposed at both ends of the spring. The lifting hook passes through the two annular washers and the spring.

3. The automatic ejection device for disassembling the cover plate of the silica sol casting cup according to claim 2, characterized in that: The pre-embedded nut has a circular upper end, a cylindrical middle end, and a rectangular lower end.

4. The automatic ejection device for disassembling the cover plate of the silica sol casting cup according to claim 3, characterized in that: The annular gasket has a thickness of 2-3 mm, an inner diameter of Φ12-15 mm, and an outer diameter of Φ20-25 mm; the spring has an outer diameter of Φ18-22 mm and a length of 60-70 mm.

5. The automatic ejection device for disassembling the cover plate of the silica sol casting cup according to claim 4, characterized in that: The pre-embedded nut has an upper circular diameter of Φ25-30mm and a thickness of 2-3mm, a middle cylindrical diameter of Φ12-15mm and a height of 25-30mm, and a lower rectangular width of 14-16mm, a length of 30-35mm, and a thickness of 2-3mm.

6. The automatic ejection device for disassembling the cover plate of the silica sol casting cup according to claim 5, characterized in that: The pre-embedded nut has a threaded hole at its center, with a depth of 25-30 mm and an outer diameter of 10-12 mm.

7. The automatic ejection device for disassembling the cover plate of the silica sol casting cup according to claim 6, characterized in that: The annular gasket and the embedded nut are made of stainless steel.

8. The automatic ejection device for disassembling the cover plate of the silica sol casting cup according to any one of claims 1 to 7, characterized in that: The lower end of the pre-embedded nut is fixed on the mold positioning pin and pre-embedded in the wax pattern of the pouring cup.

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