Precoated sand shell mold casting equipment

Abstract

The invention relates to the field of precoated sand casting, in particular to precoated sand shell mold casting equipment which comprises two symmetrically-arranged chains, a plurality of box bodies are arranged between the two chains, mold cores are placed in the box bodies, and the outer side of each box body is erected on the chains through a plurality of supporting rods; a sand vibrating assembly is arranged on the inner side of the starting end of the chain and is used for vibrating a box body with an upward opening and compacting molding sand between the box body and the mold core; the box body is reversed by 180 degrees along with the chain, the opening of the box body faces downwards, at the moment, the bottom of the box body is located on the vibration discharging assembly, and a first vibration plate vibrates at high frequency, so that blanks and molding sand poured in the box body are completely poured out, cleanliness of the interior of the box body is guaranteed, and a mold core can be completely located in the box body; and a horizontal state is kept, so that a powerful guarantee is provided for subsequent precise pouring and product quality.

Description

Technical Field

[0001] This invention relates to the field of coated sand casting, specifically a coated sand shell casting equipment. Background Technology

[0002] Coated sand casting is a shell casting process that uses phenolic resin as a binder. Due to its high dimensional accuracy, good surface quality, and excellent collapsibility, it has been widely used in the production of complex and precision castings such as cast iron, cast steel, and non-ferrous alloys.

[0003] Currently, coated sand casting technology has achieved automated production line processing and boasts high productivity. However, it also has shortcomings. For example, in the automated production process, there is a step called "turning and unloading," where the molten material needs to be removed from the casting box after pouring and cooling. This step involves turning the casting box over to dump the material out. The turning and unloading is driven by hydraulic force, specifically using a hydraulic rod to tilt the box. This limits the tilting angle, resulting in incomplete dumping of the molding sand from the box, leaving a small amount of molding sand at the bottom. When placing the core in the box later, the bottom of the core sits on the remaining molding sand, causing the core to become misaligned. Furthermore, when pouring molten material, there are issues with the molten material not being able to be poured accurately along the injection port and the molten material not being able to repeatedly fill the core, directly affecting the quality of the final product.

[0004] Therefore, a coated sand shell casting equipment is proposed to address the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: the coated sand shell casting equipment of the present invention includes two symmetrically arranged chains, and multiple boxes are arranged between the two chains. The boxes are used to place the cores, and the outside of each box is supported on the chain by multiple support rods. A sand-vibrating assembly is provided on the inner side of the starting end of the chain. The sand-vibrating assembly is used to vibrate the box with the opening facing upward and to compact the molding sand between the box and the core. A vibrating feeding assembly is provided at the end of the chain. The vibrating feeding assembly is used to vibrate the box with the opening facing downward. The vibrating feeding assembly includes a support frame provided on the inner side of the chain. The support frame is arranged along the length of the chain. A hanging plate is provided on the support plate near the end of the chain. The hanging plate is horizontally arranged through the chain. Multiple No. 1 springs are arranged in the same inclined direction on the lower surface of the hanging plate. A No. 1 vibrating plate is fixed to the end of the No. 1 spring. A No. 1 vibrating motor is provided on the upper surface of the No. 1 vibrating plate. The lower surface of the No. 1 vibrating plate is attached to the end face of the box away from the opening.

[0007] Preferably, the vibrating sand assembly includes a top plate horizontally fixed to the support frame. The top plate is provided with multiple sets of No. 2 springs. Multiple No. 2 springs in each set jointly support a No. 2 vibrating plate. The upper surface of the No. 2 vibrating plate is attached to the end face of the box body facing away from the opening. A No. 2 vibrating motor is fixed to the lower surface of the No. 2 vibrating plate.

[0008] Preferably, a sand-dropping assembly is provided at the initial end of the chain. The sand-dropping assembly is used to drop molding sand into the gap between the box and the core. The sand-dropping assembly includes a support arm provided on one side of the chain. A sand-dropping hopper is fixed to the end of the support arm. The lower end of the sand-dropping hopper is narrowed. A sliding opening is opened on one side wall of the sand-dropping hopper. A baffle is provided inside the sliding opening. A conveying pipe is slidably connected inside the sliding opening. The end of the conveying pipe extends into the sand-dropping hopper and slides against the baffle. A drive assembly is provided between the sand hopper and the support arm, and the drive assembly is used to drive the sand hopper to move up and down.

[0009] Preferably, a second vibration motor is installed below the box body opposite the lower end of the sand hopper.

[0010] Preferably, a sealing mechanism is provided in the lower port of the sand hopper. The sealing mechanism is used to temporarily seal the pouring port of the core. The sealing mechanism includes a cross support body set in the lower port. A compression spring is fixedly connected to the lower surface of the cross support body at the middle position. A sealing head is fixedly connected to the lower end of the compression spring.

[0011] Preferably, the upper end face of the cross support is provided with a slope, and the upper end face of the sealing head is set in a conical shape.

[0012] Preferably, each of the boxes has sliding grooves on both sides; the support frame is provided with two sets of guide rails, one set of guide rails is located above the inner ring at the initial end of the chain, and the other set of guide rails is located below the inner ring at the end of the chain, and each set of guide rails is slidably connected in the sliding grooves on the box.

[0013] Preferably, the support frame is provided with a tray for supporting the lower surface of the chain, and an oil outlet hole is opened on the upper surface of the tray, which is connected to an oil pipe.

[0014] Preferably, an oil outlet hole is also formed on the lower surface of the other guide rail.

[0015] Preferably, a high-pressure air pipe is provided below the initial end of the chain. The high-pressure air pipe is arranged along the length of the chain and has multiple air jet holes. The gas discharged from the air jet holes is used to impact the molding sand remaining in the box.

[0016] The advantages of this invention are: 1. In this invention, the box body is inverted 180 degrees along with the chain, with the box body opening facing downwards. At this time, the bottom of the box body is located in the vibrating feeding component, and the No. 1 vibrating plate vibrates at a high frequency, so that the billet and molding sand that have been poured into the box body are completely poured out, ensuring the cleanliness of the inside of the box body. This allows the core to be completely placed in the box body and kept in a horizontal state, providing a strong guarantee for subsequent accurate pouring and product quality.

[0017] 2. In this invention, the sand dropping component is located above the sand vibrating component. When the sand dropping component drops the molding sand into the box, the sand vibrating component starts to vibrate the box. That is, the sand is dropped and vibrated at the same time, so that the molding sand can be quickly and more thoroughly compacted. Attached Figure Description

[0018] Figure 1 This is a first-view perspective perspective view of the coated sand shell casting equipment in this invention; Figure 2 This is a second-view perspective perspective view of the coated sand shell casting equipment in this invention; Figure 3 This is a third-view perspective view of the coated sand shell casting equipment in this invention; Figure 4 This is a fourth-view perspective view of the coated sand shell casting equipment in this invention; Figure 5 This is a front view of the coated sand shell casting equipment of the present invention; Figure 6 This is a perspective view of the support frame in this invention; Figure 7 for Figure 6 Two enlarged views of the details at point A in the middle; Figure 8 This is a front view of the support frame in this invention; Figure 9 This is a front view of the chain in this invention; Figure 10 This is a perspective view of the chain in this invention; Figure 11 This is a perspective view of the vibratory feeding assembly in this invention; Figure 12 This is a perspective view of the sand-falling component in this invention; Figure 13 This is a perspective view of the sand-falling hopper in this invention; Figure 14 This is a cross-sectional view of the sand-falling hopper in this invention; Figure 15 This is a perspective view of the cross-shaped support in this invention; Figure 16 This is a schematic diagram of the structure in this invention that uses a heat-insulating layer casting to insulate the thicker parts.

[0019] In the diagram: 1. Chain; 2. Box; 3. Support frame; 4. Hanging plate; 5. Spring No. 1; 6. Vibrating plate No. 1; 7. Vibrating motor No. 1; 8. Molten pool; 9. Guide chute; 10. Top plate; 11. Spring No. 2; 12. Vibrating plate No. 2; 13. Vibrating motor No. 2; 14. Support arm; 15. Sand hopper; 16. Sliding mouth; 17. Baffle; 18. Conveying pipe; 19. Lead screw; 20. Motor; 21. Thick part; 22. Insulation layer; 23. Cross support body; 24. Compression spring; 25. Sealing head; 26. Sliding groove; 27. Guide rail; 28. Support plate; 29. ​​Oil outlet; 30. Oil pipe; 31. High-pressure air pipe. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] Reference Figure 1 - Figure 11 A coated sand shell casting device includes two symmetrically arranged chains 1, with multiple boxes 2 arranged between the two chains 1. The boxes 2 are used to place the core, and each box 2 is supported on the chain 1 by multiple support rods. A sand-vibrating assembly is provided on the inner side of the starting end of the chain 1. The sand-vibrating assembly is used to vibrate the box 2 with the opening facing upward and to compact the molding sand between the box 2 and the core. A vibrating feeding assembly is provided at the end of the chain 1. The vibrating feeding assembly is used to vibrate the box 2 with the opening facing downward. The vibrating feeding assembly includes a support frame 3 provided on the inner side of the chain 1. The support frame 3 is arranged along the length of the chain 1. A hanging plate 4 is provided on the support plate near the end of the chain 1. The hanging plate 4 is arranged horizontally through the chain 1. Multiple first springs 5 ​​are arranged in the same inclined direction on the lower surface of the hanging plate 4. A first vibration plate 6 is fixed to the end of the first spring 5. A first vibration motor 7 is provided on the upper surface of the first vibration plate 6. The lower surface of the first vibration plate 6 is attached to the end face of the box 2 away from the opening. In this embodiment, sprockets driving the chain 1 to rotate are provided on the inner sidewalls at both ends. The sprockets are connected to an external geared motor, which is controlled by a PLC and can realize the intermittent rotation of the chain 1. A molten pool 8 is provided on one side of the chain 1. The molten pool 8 is connected to a guide trough 9. A high-temperature valve controlling the downward flow of molten material is provided at the end of the guide trough 9. The high-temperature valve is connected to an external servo motor, which is controlled by a PLC and can intermittently control the opening and closing of the high-temperature valve, thereby realizing the intermittent pouring of molten material into the core. After the molten material is poured into the core, it is slowly conveyed by chain 1. During the conveying process, the molten material gradually cools and solidifies. Then, it is conveyed to the end of chain 1 and continues to be conveyed. At this time, the box 2 with its opening facing upwards is inverted 180 degrees in accordance with chain 1, and the opening of box 2 faces downwards. At this time, the bottom of box 2 is located below the first vibrating plate 6. The first vibrating motor 7 drives the first vibrating plate 6 to vibrate at a high frequency. The vibration is transmitted to box 2, so that the billet and molding sand that have been poured into box 2 are completely poured out, ensuring the cleanliness of the inside of box 2. Subsequently, box 2 moves with chain 1, and the opening of box 2 rotates upwards. Then, the core is placed. At this time, the core can be completely placed in box 2 and kept in a horizontal state, which provides a strong guarantee for subsequent accurate pouring and product quality.

[0022] Reference Figure 1 - Figure 11 The vibrating sand assembly includes a top plate 10 horizontally fixed to the support frame 3. The top plate 10 is provided with multiple sets of No. 2 springs 11. Multiple No. 2 springs 11 in each set jointly support a No. 2 vibrating plate 12. The upper surface of the No. 2 vibrating plate 12 is attached to the end face of the box body 2 away from the opening. A No. 2 vibrating motor 13 is fixed to the lower surface of the No. 2 vibrating plate 12. At the initial end of chain 1, molding sand is injected into the gap between the core and the box 2. Then, under the vibration of the sand vibrating assembly, the molding sand in the box 2 is vibrated and compacted. At this time, the molding sand supports the core to prevent the core from being pushed open due to thermal expansion when the molten material is poured into the core, which would cause the cavity formed by the core to lose its accuracy.

[0023] Reference Figure 1 - Figure 5 ,as well as Figure 12 - Figure 15 The initial end of the chain 1 is provided with a sand-dropping assembly. The sand-dropping assembly is used to drop molding sand into the gap between the box 2 and the core. The sand-dropping assembly includes a support arm 14 on one side of the chain 1. The end of the support arm 14 is fixedly connected to a sand-dropping hopper 15. The lower end of the sand-dropping hopper 15 is set in a constricted shape. A sliding opening 16 is opened on one side wall of the sand-dropping hopper 15. A baffle 17 is provided inside the sliding opening 16. A conveying pipe 18 is slidably connected inside the sliding opening 16. The end of the conveying pipe 18 extends into the sand-dropping hopper 15 and slides against the baffle 17. A drive assembly is provided between the sand hopper 15 and the support arm 14. The drive assembly is used to drive the sand hopper 15 to move up and down. In this embodiment, the sand-falling component is located above the sand-vibrating component. After the sand-falling component dumps molding sand into the housing 2, the sand-vibrating component begins to vibrate the housing 2. That is, sand is dumped and vibrated simultaneously, allowing the molding sand to be compacted quickly and more thoroughly. Specifically, the driving component includes a 20 motor mounted on the support arm 14. The 20 motor is controlled by a PLC, and a lead screw 19 is fixedly connected to the output end of the 20 motor. The lead screw 19 is threaded onto the sand-falling hopper 15. The forward and reverse rotation of the 20 motor enables the sand-falling hopper 15 to rotate. As the sand hopper 15 moves downward, the baffle 17 moves downward relative to the conveying pipe 18, and the end of the conveying pipe 18 gradually moves upward above the baffle 17. At this time, the baffle 17 no longer blocks the end of the conveying pipe 18, and the molding sand can flow from the conveying pipe 18 into the sand hopper 15, and then fall down along the sand hopper 15 into the box 2. To prevent the molding sand from falling into the pouring gate, the pouring gate can be covered. After the molding sand is poured, the covering is removed. During the process of the molding sand falling into the box 2, the sand vibrating assembly can vibrate the box 2. After the molding sand is fed, the drive assembly drives the sand drop hopper 15 to move upward. During the upward movement of the sand drop hopper 15, the baffle 17 gradually blocks the conveying pipe 18. The conveying pipe 18 is blocked, and the feeding of molding sand stops.

[0024] Reference Figure 1 - Figure 9 A second vibration motor 13 is installed below the box 2 opposite to the lower end of the sand hopper 15; In this embodiment, multiple second-generation vibration motors 13 are provided on the top plate 10, and the power of the second-generation vibration motor 13 located below the sand hopper 15 can be reduced by half. That is, the second-generation vibration motor 13 is provided below the box 2 opposite to the lower end of the sand hopper 15. Since the core is placed in the box 2 without any support, the high-intensity vibration will cause the core to shift inside the box 2. At this time, the power of the second-generation vibration motor 13 located below the sand hopper 15 is reduced, while the other second-generation vibration motors 13 can operate at high power, so that the molding sand can be fully vibrated. Reference Figure 16 Considering that the casting has a thick part 21, the cooling process of the thick part 21 is different from that of the thinner parts. Under the same cooling conditions, the thinner parts of the casting can be cooled quickly, while the thick part 21 cools slowly. The liquid metal is not fed enough, and vacuum pores (shrinkage cavities) or diffuse micropores (shrinkage porosity) are formed in the solidified area. Therefore, a heat insulation layer 22 can be set on the thick part 21. Specifically, heat insulation cotton is set outside the core and wrapped around the corresponding thick part 21 on the core. As shown in the figure, this is one case of setting heat insulation cotton. The heat insulation cotton is wrapped and fixed on the core and placed together in the box 2. Then, molding sand is added and vibrated to compact it.

[0025] Reference Figure 12 - Figure 15 The lower port of the sand hopper 15 is provided with a sealing mechanism. The sealing mechanism is used to temporarily seal the pouring port of the core. The sealing mechanism includes a cross support body 23 set in the lower port. A compression spring 24 is fixedly connected to the lower surface of the middle position of the cross support body 23. A sealing head 25 is fixedly connected to the lower end of the compression spring 24. The sealing mechanism works in conjunction with the sand-falling assembly. When the sand-falling hopper 15 moves downward, the sealing head 25 first embeds into the pouring port and seals it. Then, the sand-falling hopper 15 continues to move downward, the compression spring 24 is compressed, and at the same time, the baffle 17 no longer blocks the outlet end of the conveying pipe 18. The molding sand in the conveying pipe 18 flows into the sand-falling hopper 15 and then falls into the box 2. After injecting a certain amount of molding sand, the sand-falling hopper 15 moves upward, and the baffle 17 blocks the outlet end of the conveying pipe 18. At this time, the sealing hopper still blocks the pouring port. The sand-falling hopper 15 continues to move upward, and at this time, the sealing hopper moves upward and separates from the pouring port. Then, under the transmission of the chain 1, it is conveyed to the molten material pouring position. The installation of this sealing mechanism eliminates the need for a separate process of covering the pouring port, and also saves the step of removing the covering.

[0026] Reference Figure 12 - Figure 15 The upper end face of the cross support 23 is provided with a slope, and the upper end face of the sealing head 25 is set in a cone shape; The shape of the upper end face of the cross support 23 and the upper end face of the sealing head 25 is designed to prevent molding sand from staying on them and falling into the pouring gate when the sand drop hopper 15 moves upward. This further ensures the quality of the subsequent castings. Meanwhile, when the molding sand is being added, the No. 2 vibration motor 13 at the bottom of the box 2 runs continuously and vibrates the box 2. At the same time, the vibration force is also transmitted to the cross support body 23 through the sealing head 25 and the compression spring 24. Before the sealing bucket leaves the pouring port, the molding sand on it is vibrated and falls into the box 2.

[0027] Reference Figure 1 - Figure 10 Each of the boxes 2 has a sliding groove 26 on both sides; the support frame 3 is provided with two sets of guide rails 27, one set of guide rails 27 is located above the inner ring of the initial end position of the chain 1, and the other set of guide rails 27 is located below the inner ring of the end position of the chain 1, and each set of guide rails 27 is slidably connected in the sliding groove 26 on the box 2. The guide rail 27 is used to support the housing 2. There are two sets of guide rails 27, one set is set above the inner ring of the initial end of the chain 1, that is, set at the position of the sand vibrating component, and the other set of guide rails 27 is set below the inner ring of the end of the chain 1, that is, set at the position of the vibrating feeding component. This provides support for the housing 2 and ensures the overall stability of the coated sand shell casting equipment.

[0028] Reference Figure 1 - Figure 7 The support frame 3 is provided with a support plate 28, which is used to support the lower surface of the chain 1, and an oil outlet hole 29 is opened on the upper surface of the support plate 28, which is connected to an oil pipe 30. The support plate 28 is used to support the chain 1, and the support plate 28 is provided with an oil outlet 29. The oil outlet 29 is connected to the oil pipe 30, which is connected to an external oil pump. Lubricating oil is continuously discharged from the oil outlet 29, and the lubricating oil continuously replenishes the chain 1 for lubrication, so that the chain 1 can be replenished for lubrication in time under high temperature conditions. This is a specific means of protecting the chain 1.

[0029] Reference Figure 7 Another guide rail 27 also has an oil outlet hole 29 on its lower surface. The oil outlet hole 29 on the lower surface of the guide rail 27 continuously discharges lubricating oil, which can not only replenish the oil for lubrication of the chain 1, so that the chain 1 can be coated with lubricating oil on both the top and bottom, but also replenish the oil for lubrication of the relative sliding between the slide groove 26 and the guide rail 27, reducing wear.

[0030] Reference Figure 2 A high-pressure air pipe 31 is provided below the initial end of the chain 1. The high-pressure air pipe 31 is arranged along the length of the chain 1 and multiple air jet holes are provided on the high-pressure air pipe 31. The gas discharged from the air jet holes is used to impact the molding sand remaining in the box 2. The high-pressure air pipe 31 is connected to an external air pump, and high-pressure gas is continuously discharged from the air jet. The high-pressure gas impacts the box 2 with the opening facing downward. At this time, the castings that have been poured inside the box 2 are detached from the box 2 under the vibration force of the vibrating feeding component. The subsequent impact of high-pressure gas into the box 2 is to further clean the inside of the box 2.

[0031] Working principle: A molten pool 8 is set on one side of the chain 1. The molten pool 8 is connected to a guide trough 9. A high-temperature valve that controls the downward flow of molten material is set at the end of the guide trough 9. The high-temperature valve is connected to an external servo motor. The servo motor is controlled by a PLC and can intermittently control the opening and closing of the high-temperature valve, thereby realizing the intermittent pouring of molten material into the core. After the molten material is poured into the core, it is slowly conveyed by chain 1. During the conveying process, the molten material gradually cools and solidifies. Then, it is conveyed to the end of chain 1 and continues to be conveyed. At this time, the box 2 with its opening facing upwards is inverted 180 degrees in accordance with chain 1, and the opening of box 2 faces downwards. At this time, the bottom of box 2 is located below the first vibrating plate 6. The first vibrating motor 7 drives the first vibrating plate 6 to vibrate at a high frequency. The vibration is transmitted to box 2, so that the billet and molding sand that have been poured into box 2 are completely poured out, ensuring the cleanliness of the inside of box 2. Subsequently, box 2 moves with chain 1, and the opening of box 2 rotates upwards. Then, the core is placed. At this time, the core can be completely placed in box 2 and kept in a horizontal state, which provides a strong guarantee for subsequent accurate pouring and product quality.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coated sand shell casting equipment, characterized in that: It includes two symmetrically arranged chains, with multiple boxes between the two chains. The boxes are used to hold the core, and each box is supported on the chain by multiple support rods. A sand-vibrating assembly is provided on the inner side of the starting end of the chain. The sand-vibrating assembly is used to vibrate the box with the opening facing upward and to compact the molding sand between the box and the core. A vibrating feeding assembly is provided at the end of the chain. The vibrating feeding assembly is used to vibrate the box with the opening facing downward. The vibrating feeding assembly includes a support frame provided on the inner side of the chain. The support frame is arranged along the length of the chain. A hanging plate is provided on the support plate near the end of the chain. The hanging plate is horizontally arranged through the chain. Multiple No. 1 springs are arranged in the same inclined direction on the lower surface of the hanging plate. A No. 1 vibrating plate is fixed to the end of the No. 1 spring. A No. 1 vibrating motor is provided on the upper surface of the No. 1 vibrating plate. The lower surface of the No. 1 vibrating plate is attached to the end face of the box away from the opening.

2. The coated sand shell casting equipment according to claim 1, characterized in that: The vibrating sand assembly includes a top plate horizontally fixed to a support frame. The top plate is equipped with multiple sets of No. 2 springs. Multiple No. 2 springs in each set jointly support a No. 2 vibrating plate. The upper surface of the No. 2 vibrating plate is attached to the end face of the box body facing away from the opening. A No. 2 vibrating motor is fixed to the lower surface of the No. 2 vibrating plate.

3. The coated sand shell casting equipment according to claim 1, characterized in that: The initial end of the chain is provided with a sand-dropping component, which is used to drop molding sand into the gap between the box and the core. The sand-dropping component includes a support arm set on one side of the chain, and a sand-dropping hopper is fixed to the end of the support arm. The lower end of the sand-dropping hopper is set in a constricted shape. A sliding opening is opened on one side wall of the sand-dropping hopper. A baffle is set inside the sliding opening. A conveying pipe is slidably connected inside the sliding opening. The end of the conveying pipe extends into the sand-dropping hopper and slides against the baffle. A drive assembly is provided between the sand hopper and the support arm, and the drive assembly is used to drive the sand hopper to move up and down.

4. The coated sand shell casting equipment according to claim 3, characterized in that: A second vibration motor is installed below the box opposite the lower end of the sand hopper.

5. The coated sand shell casting equipment according to claim 4, characterized in that: The lower port of the sand hopper is equipped with a sealing mechanism for temporarily sealing the pouring port of the core. The sealing mechanism includes a cross support body set in the lower port. A compression spring is fixedly connected to the lower surface of the middle position of the cross support body, and a sealing head is fixedly connected to the lower end of the compression spring.

6. The coated sand shell casting equipment according to claim 5, characterized in that: The upper surface of the cross support is provided with a slope, and the upper surface of the sealing head is set in a cone shape.

7. The coated sand shell casting equipment according to claim 4, characterized in that: Each of the boxes has sliding grooves on both sides; the support frame is provided with two sets of guide rails, one set of guide rails is located above the inner ring at the initial end of the chain, and the other set of guide rails is located below the inner ring at the end of the chain, and each set of guide rails is slidably connected in the sliding grooves on the box.

8. The coated sand shell casting equipment according to claim 7, characterized in that: The support frame is equipped with a tray, which is used to support the lower surface of the chain. An oil outlet hole is opened on the upper surface of the tray, and the oil outlet hole is connected to an oil pipe.

9. The coated sand shell casting equipment according to claim 7, characterized in that: Another guide rail also has an oil outlet hole on its lower surface.

10. A coated sand shell casting equipment according to claim 8, characterized in that: A high-pressure air pipe is installed below the initial end of the chain. The high-pressure air pipe is arranged along the length of the chain and has multiple air jet holes. The gas discharged from the air jet holes is used to impact the molding sand remaining in the box.

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