Silica sol investment casting shell making equipment

Abstract

The invention discloses silica sol investment casting shell making equipment, and relates to the technical field of investment casting equipment, the silica sol investment casting shell making equipment comprises a sand spraying cylinder, a pouring rod, a revolution mechanism and a rotation mechanism, the axis of the sand spraying cylinder is horizontally placed, and a sand spraying opening is formed in the inner top wall of the sand spraying cylinder and used for vertically spraying sand downwards; the outer wall of the pouring rod is used for fixing a wax pattern workpiece and is arranged in the sand spraying cylinder, the pouring rod can revolve and rotate at the same time, the revolution axis of the pouring rod and the axis of the sand spraying cylinder are coaxially arranged, the revolution axis is located in the center of the pouring rod in the length direction, and the pouring rod rotates around the axis of the pouring rod; the revolution mechanism and the rotation mechanism are used for driving the pouring rod to revolve and rotate correspondingly. The sand spraying device has the effect of improving the sand spraying quality and efficiency of the wax mold.

Description

Technical Field

[0001] The present application relates to the technical field of investment casting equipment, and in particular to a silica sol investment casting shell making equipment. Background Art

[0002] Investment casting, also known as lost wax casting, is a high-precision metal forming process primarily used to produce complex, precisely dimensioned metal parts. Its core steps include mold making, shell formation, dewaxing, smelting and pouring, and post-processing. It can produce complex parts with wall thicknesses of less than 0.5 mm (such as turbine blades and jewelry). The resulting castings have a smooth surface, minimizing subsequent processing. It is widely applicable to difficult-to-machine materials such as stainless steel, titanium alloys, and high-temperature alloys.

[0003] Shell formation is a core step in investment casting, directly determining the precision, surface quality, and yield of the casting. Shell formation essentially involves wrapping the wax pattern with multiple layers of refractory material to form a ceramic shell that is stable at high temperatures. The shell formation process requires first immersing the wax pattern in a neutral detergent (such as alcohol or a specialized degreasing solution) to remove surface oils. The wax pattern is then immersed in silica sol, allowing the sol to form a uniform slurry layer on the surface. Sand is then evenly sprinkled over the wet slurry surface. Finally, the wax pattern is placed in a heating vessel and heated to allow the silica sol shell to fully gel and harden.

[0004] At present, sand sprinkling operations are mainly performed manually or on a fluidized bed. Manual sand sprinkling is time-consuming and labor-intensive, while conventional fluidized bed sand sprinkling may result in uneven sand sprinkling and partial lack of sand on the surface of the wax mold, resulting in poor sand sprinkling quality on the wax mold surface and affecting the subsequent shell making quality. Summary of the Invention

[0005] In order to improve the time-consuming and labor-intensive manual sand spreading, and the conventional fluidized bed sand spreading which may result in uneven sand spreading, incomplete sand spreading, etc., the present application provides a silica sol investment casting shell making equipment.

[0006] The present application provides a silica sol investment casting shell making device, which adopts the following technical solution: A silica sol investment casting shell making device, comprising The sand spraying cylinder has a horizontal axis and a sand spraying port is opened on the top of the inner cylinder wall for spraying sand vertically downwards; The casting rod, whose outer wall is used to fix the wax mold workpiece, is placed in the sand pouring cylinder. The casting rod can simultaneously revolve and rotate. The rotation axis of the casting rod is coaxial with the axis of the sand pouring cylinder, and the revolution axis is located at the center position of the length direction of the casting rod. The casting rod rotates around its own axis. The revolution mechanism and the rotation mechanism are used to drive the casting rod to revolve and rotate respectively.

[0007] Optionally, the revolution mechanism includes a turntable, which is rotatably connected to the inner wall of the sand dredging cylinder, and the rotation axis is coaxial with the axis of the sand dredging cylinder. Two clamping members that can move relative to each other are movably provided on the side wall of the turntable. The two clamping members are used to clamp the center position of the casting rod. The self-rotation structure includes a driving roller and an auxiliary roller. The driving roller is rotatably connected to the inner wall of one of the clamping members, and the rotation axis is perpendicular to the axis of the turntable. The auxiliary roller is rotatably connected to the inner wall of the other clamping member, and the rotation axis is parallel to the driving roller axis. The driving roller and the auxiliary roller are both in contact with the casting rod.

[0008] Optionally, a knocking block is movably provided on the inner wall of the sand pouring cylinder. The knocking block is arranged on one side of the upward rotating end of the pouring rod and is located on the revolution path of the pouring rod. When the pouring rod revolves along the axis of the sand pouring cylinder, the upward moving end of the pouring rod collides with the knocking block.

[0009] Optionally, a slider is connected to the inside of the sand-drenching barrel in a circumferential sliding manner. The slider is arc-shaped, and the curvature is consistent with the curvature of the sand-drenching barrel. A sliding groove for the movement of the slider is opened in the barrel of the sand-drenching barrel. The knocking block is connected to the top of the slider through a mounting plate. A first return member is provided on one side of the top of the mounting plate. One end of the first return member is connected to the inner barrel wall of the sand-drenching barrel, and the other end is connected to the top of the mounting plate. The knocking block is made of elastic material.

[0010] Optionally, a blowing port is provided on the inner wall of the sand spraying cylinder, which is used to connect with an external air supply device. The blowing port is directed toward the central axis of the sand spraying cylinder and is used to blow hot air to the surface of the wax mold. The blowing port and the sliding groove are independent cavities, and the blowing port and the sand spraying port work alternately.

[0011] Optionally, the sand spraying barrel is provided with a movably provided sand spraying baffle at the opening of the sand spraying port, and the sand spraying baffle can block or conduct the sand spraying port during the movement. The sand spraying barrel is provided with a contact switch on the inner wall of one end of the top of the sliding groove. The sand spraying barrel is also provided with a control unit, which is electrically connected to the contact switch. When the slider slides upward, the contact switch is triggered, and the control unit controls the movement of the sand spraying baffle to make the sand discharge intermittently from the sand spraying port.

[0012] Optionally, a screen is movably provided at the bottom of the inner cylinder wall of the sand shower machine for screening out larger sand piles, and a shaking assembly is provided in the sand shower machine, and the knocking block drives the screen to shake through the shaking assembly to promote the screening out of the sand pile.

[0013] Optionally, the screen is connected to the sand drench barrel along the circumferential sliding direction of the sand drench barrel, the screen is arc-shaped and consistent with the curvature of the sand drench barrel, a shaking groove for the sand drench barrel to slide is opened inside the sand drench barrel, and the shaking assembly includes a connecting rope and an elastic impact block, one end of the screen is connected to the slider through the connecting rope, and second return members are provided at both ends of the screen along the sliding direction, one end of the second return member is connected to the end of the screen, and the other end is connected to the inner wall of the sand drench barrel, and an elastic impact block is provided on the inner wall of the sand drench barrel at least one end in the length direction of the shaking groove.

[0014] Optionally, a knocking ball is provided at the bottom of the screen, and the knocking ball is connected to the screen through an elastic member, and the knocking ball is used to knock the screen at intervals during swinging.

[0015] In summary, this application has at least one of the following beneficial effects: 1. By placing the casting rod and the wax mold on its surface as a whole horizontally in the sand shower machine, the fine sand falling from the sand shower port on the top of the sand shower machine can easily and completely cover the entire wax mold, so that the volume of the sand shower machine can be further reduced, thereby reducing the floor space of the sand shower machine; at the same time, by arranging a revolution mechanism and a rotation mechanism inside the sand shower machine, the casting rod can rotate along its own axis under the drive of the rotation mechanism, and at the same time, the revolution mechanism drives the rotation mechanism connected to the wax mold to rotate along the axis of the sand shower machine, so that the casting rod drives the wax mold to rotate while also orbiting. The wax mold can keep rotating and orbiting simultaneously during sand showering, so that all parts of the wax mold surface can be sanded more evenly and comprehensively, greatly improving the quality of the wax mold sand showering, and also reducing the workload of the staff; 2. By setting a protruding knocking block on the inner ring of the sand drenching machine, when the casting rod drives the wax mold to revolve around the central axis of the sand drenching machine, the upward moving end of the casting rod will collide with the knocking block at intervals. The casting rod will vibrate when colliding with the knocking block. The vibration of the casting rod will be transmitted to the wax mold fixed on it, causing the wax mold to vibrate instantaneously, thereby quickly shaking off the fine sand on the surface of the wax mold that has not yet stabilized, leaving only the fine sand that is fully combined with the silica sol. The vibration of the wax mold can also improve the quality of the combination of fine sand on the surface of the wax mold and the silica sol.

[0016] 3. A movable sand sprinkling baffle is provided at the opening of the sand sprinkling port, which can cover or open the sand sprinkling port during the activity, thereby adjusting the working state of the sand sprinkling port. At the same time, an air blowing port is provided towards the surface of the wax mold on the inner ring of the sand sprinkling machine. The wax mold is first sprayed with sand. When the casting rod rotates and hits the knocking block, the knocking block will be driven to move up together with the slider. When the slider moves up, it will touch the contact switch. At this time, the contact switch sends a signal to the control unit, and the control unit controls the movement of the sand sprinkling baffle. At this time, the sand sprinkling baffle blocks the sand sprinkling port, and the sand sprinkling port stops working. At the same time, the control switch controls the external air supply equipment to introduce hot air into the air blowing port. The hot air flows through the air blowing port for preliminary drying of the surface of the wax mold, thereby improving the bonding efficiency between fine sand and silica sol. The sand sprinkling port and the air blowing port are alternately triggered as the casting rod hits the knocking block, so that the sand sprinkling and hot air drying operations are alternately performed, thereby fully improving the quality of the bonding between fine sand and silica sol. 4. By arranging a screen at the bottom of the inner ring of the sand shower machine, the screen can screen out fine sand blocks that have been in contact with the silica sol but not firmly combined. These fine sand blocks are formed by the combination of undried silica sol and fine sand, which makes the volume of these fine sand blocks larger than that of normal fine sand, making them more easily intercepted by the screen, and the screen slides under the drive of the slider, and the sliding screen compresses the second return member at one end. The restoring force generated by the compression of the second return member drives the screen to vibrate back and forth. The reciprocatingly vibrating screen is more likely to screen out fine sand that can be reused, and the screen will repeatedly hit the elastic impact block during the reciprocating shaking process. The impact will vibrate the screen, thereby further screening out larger fine sand blocks; at the same time, the screen can drive the knocking ball to swing back and forth through the elastic member during the reciprocating movement. The knocking ball will knock the screen at intervals during the reciprocating swing. The knocking will increase the amplitude of the screen vibration, making it easier to screen out fine sand blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram showing the overall structure of the shell making equipment according to an embodiment of the present application; Figure 2 This is a schematic structural diagram showing a clamping member according to an embodiment of the present application; Figure 3 This is a partial cross-sectional schematic diagram showing the principle of sand drenching a workpiece according to an embodiment of the present application; Figure 4 This is a structural diagram showing the positions of the knocking block and the air outlet in an embodiment of the present application; Figure 5 It is a partial cross-sectional schematic diagram showing the working principle of the knocking block in an embodiment of the present application; Figure 6 This is a partial cross-sectional schematic diagram showing the working principle of the screen in an embodiment of the present application; Figure 7 It is a schematic diagram of the partial structure of the screen and the knocking ball shown in the embodiment of the present application.

[0018] Explanation of the accompanying reference numerals: 1. Sand-sprinkling cylinder; 11. Placement port; 12. Base; 13. Sand-loading funnel; 14. Sand-sprinkling port; 15. Turntable; 151. Clamping member; 152. Double-headed screw; 153. Driving roller; 154. Auxiliary roller; 16. Sliding groove; 17. Blowing port; 18. Contact switch; 19. Control unit; 2. Casting rod; 3. Wax mold; 4. Knocking block; 41. Mounting plate; 42. First return member; 5. Sliding block; 6. Sand-sprinkling baffle; 7. Screen; 71. Connecting rope; 72. Second return member; 73. Knocking ball; 74. Elastic member; 8. Shaking groove; 81. Elastic impact block. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-7 This application is described in further detail.

[0020] The present application discloses a silica sol investment casting shell making device, referring to Figures 1 to 3 The silica sol investment casting shell making equipment includes a sand pouring cylinder 1 and a casting rod 2, wherein the sand pouring cylinder 1 is cylindrical as a whole, and the axis of the sand pouring cylinder 1 is placed horizontally. The sand pouring cylinder 1 is closed at one end along its own axis, and a placement opening 11 is opened at the other end. The wall of the sand pouring cylinder 1 has a certain thickness. A base 12 is fixed to the bottom of the sand pouring cylinder 1, and the sand pouring cylinder 1 is stably placed on the ground through the base 12. At the same time, a sand funnel 13 is fixed to the top of the sand pouring cylinder 1. The internal cavity of the sand funnel 13 can be used to hold fine sand for sand pouring, and a sand pouring port 14 is opened at the top of the inner wall of the sand pouring cylinder 1. The sand pouring port 14 is connected to the internal cavity of the sand funnel 13, so that the fine sand inside the sand funnel 13 can fall vertically from the sand pouring port 14.

[0021] In the embodiment of the present application, the casting rod 2 has a cylindrical appearance. The outer wall of the casting rod 2 can be used to fix the wax model 3 workpiece at intervals. When sanding is required, the casting rod 2 can be placed into the sanding barrel 1 through the placement port 11. In order to drive the casting rod 2 to rotate and thus evenly sand the surface of the wax model 3 on the casting rod 2, a turntable 15 is rotatably connected to the inner wall of the closed end of the sanding barrel 1. The rotation axis of the turntable 15 is coaxial with the axis of the sanding barrel 1. A drive motor (not shown) is fixed to the outer wall of the closed end of the sanding barrel 1. The output shaft of the drive motor is coaxially fixed to the turntable 15, and the drive member can drive the turntable 15 to rotate.

[0022] Furthermore, the turntable 15 is located on the side wall of the sand-sprinkling barrel 1 and is slidably connected to two clamping members 151 that can move relative to each other. The two clamping members 151 have the same shape and are both semi-annular, so that when the two clamping members 151 are closed, they can form a complete circular ring to clamp the casting rod 2. The two clamping members 151 are symmetrically distributed relative to the axis of the turntable 15. The same end of the two clamping members 151 extends to a sliding connection with the turntable 15, so that the two clamping members 151 can rotate with the turntable 15 and move toward or away from each other in the radial direction of the turntable 15. Specifically, a double-headed screw 152 is inserted into one end of the two clamping members 151 that is slidably connected to the turntable 15. The double-headed screw 152 is rotatably connected to the turntable 15, and the rotation axis is perpendicular to the axis of the turntable 15. The two clamping members 151 respectively engage with two oppositely threaded sections on the double-ended screw 152. A micromotor is fixed to the turntable 15, and the motor's output shaft is coaxially fixed to the end of the double-ended screw 152. The forward or reverse rotation of the double-ended screw 152 controls the two clamping members 151 to move toward or away from each other, respectively, thereby tightening or loosening the casting rod 2. After the clamping members 151 clamp the casting rod 2 at the center of its length, the turntable 15 can drive the casting rod 2 to rotate together through the clamping members 151, thereby achieving the orbital revolution of the casting rod 2.

[0023] The two clamping members 151 are respectively provided with a driving roller 153 and an auxiliary roller 154 on the opposite inner walls. Specifically, the driving roller 153 is rotatably connected to the inner wall of one of the clamping members 151, and the auxiliary roller 154 is rotatably connected to the inner wall of the other clamping member 151. Three auxiliary rollers 154 are provided. The number of auxiliary rollers 154 can be increased or decreased according to the actual length of the clamping member 151, so that the auxiliary rollers 154 can fully contact with the casting rod 2. The rotation axes of the driving roller 153 and each auxiliary roller 154 are parallel, and the rotation axis of the driving roller 153 is perpendicular to the axis of the turntable 15. The opposite sides of the driving roller 153 and the auxiliary roller 154 both protrude from the inner wall surface of the clamping member 151, so that the surfaces of the driving roller 153 and the auxiliary roller 154 can directly contact the outer surface of the casting rod 2, and the driving roller 153 is driven to rotate by the driving motor, and the auxiliary roller 154 follows the rotation of the casting rod 2. In order to enhance the synergistic effect of the driving roller 153 and the auxiliary roller 154, the surfaces of the driving roller 153 and the auxiliary roller 154 are covered with wear-resistant rubber material, which increases the friction with the surface of the casting rod 2 while also extending the service life of the driving roller 153 and the auxiliary roller 154.

[0024] The casting rod 2 and the wax mold 3 on its surface are placed horizontally in the sand shower machine as a whole. At this time, it is only necessary to make the width of the sand shower port 14 cover the extended width of the wax mold 3, so that the fine sand falling from the sand shower port 14 on the top of the sand shower machine can easily and completely cover the entire wax mold 3. Therefore, the volume of the sand shower machine can be further reduced, thereby reducing the floor space of the sand shower machine; at the same time, by allowing the casting rod 2 to drive the wax mold 3 to revolve and rotate synchronously inside the sand shower machine, various parts of the surface of the wax mold 3 can be fully, evenly and comprehensively showered with sand, which greatly improves the quality of the sand showering of the wax mold 3 and also reduces the workload of the staff.

[0025] Further, refer to Figure 4 and Figure 5 The inner wall of the sand-sprinkling barrel 1 is movably provided with a striking block 4. The striking block 4 can be made of an elastic material such as elastic rubber, so that the striking block 4 is durable and has good elasticity. The striking block 4 protrudes a certain distance from the inner wall of the sand-sprinkling barrel 1, so that the striking block 4 is on the path of the revolution of the pouring rod 2. When the pouring rod 2 revolves, the striking block 4 will periodically contact and strike the surface of the pouring rod 2. In the embodiment of the present application, the striking block 4 is correspondingly provided on one side of the upwardly rotating end of the pouring rod 2, and the striking block 4 is located in the upper middle portion of the inner wall of the sand-sprinkling barrel 1, so that the upwardly rotating end of the pouring rod 2 collides with the striking block 4 at the upper middle portion of the sand-sprinkling barrel 1.

[0026] The sand-drenching barrel 1 is connected to a slider 5 in a circumferential sliding manner inside the side cylinder. The slider 5 is arc-shaped, and its curvature is consistent with the curvature of the barrel of the sand-drenching barrel 1, so that the slider 5 can slide smoothly along the circumferential direction of the sand-drenching barrel 1. Correspondingly, a sliding groove 16 for the slider 5 to move is provided in the barrel of the sand-drenching barrel 1. The knocking block 4 is connected to the top of the slider 5 as a whole through the mounting plate 41. The mounting plate 41 is rotatably connected to the top of the slider 5, and the rotation axis is parallel to the axis of the sand-drenching barrel 1. In order to increase the elastic modulus of the knocking block 4 and the slider 5 as a whole, a first return member 42 is provided on one side of the top of the mounting plate 41. The first return member 42 can be a compression spring. One end of the first return member 42 is fixedly connected to the inner wall of the sand-drenching barrel 1 at the end of the sliding groove 16, and the other end is fixedly connected to the top of the mounting plate 41. After the knocking block 4 collides with the casting rod 2, the first restoring member 42 is compressed and deformed, storing elastic potential energy, and then quickly returns to its original shape, pushing the knocking block 4 to reset, ensuring that the knocking block 4 continues to effectively knock on the surface of the casting rod 2.

[0027] When the casting rod 2 drives the wax mold 3 to revolve around the central axis of the sand spraying machine, the upward moving end of the casting rod 2 will collide with the knocking block 4 at intervals. The casting rod 2 will vibrate itself when colliding with the knocking block 4. The vibration of the casting rod 2 will be transmitted to the wax mold 3 fixed thereon, causing the wax mold 3 to also vibrate instantaneously, thereby quickly shaking off the fine sand that has not yet stabilized on the surface of the wax mold 3, leaving only the fine sand that is fully combined with the silica sol. The vibration of the wax mold 3 can also improve the quality of the combination of the fine sand on the surface of the wax mold 3 and the silica sol. At the same time, the design of the knocking block 4 prevents it from causing damage to the casting rod 2 during the collision, effectively extending the service life of the equipment.

[0028] In other embodiments of the present application, two knocking blocks 4 can be provided, and the two knocking blocks 4 are centrally symmetrically distributed along the axis of the sand spraying cylinder 1, so that the casting rod 2 can collide with the two knocking blocks 4 at the same time during the revolution. While improving the uniformity of the impact, it can also increase the impact force on the casting rod 2, further optimizing the fine sand shedding effect.

[0029] Furthermore, the sand spraying barrel 1 is provided with a movably disposed sand spraying baffle 6 at the opening of the sand spraying port 14. The sand spraying baffle 6 can block or conduct the sand spraying port 14 during its movement. Specifically, the sand spraying baffle 6 is horizontally slidably connected to the inner wall of the sand spraying barrel 1 and slides along the central axis of the sand spraying barrel 1. The sand spraying baffle 6 can be driven by an electric cylinder to slide back and forth, so that the sand spraying baffle 6 can flexibly control the opening and closing of the sand spraying port 14 during its reciprocating sliding process, thereby ensuring precise control of the sand spraying process.

[0030] An air blowing port 17 is provided on the inner wall of the sand casting barrel 1, and an air supply channel is provided inside the barrel of the sand casting barrel 1. The air supply channel is connected to the air blowing port 17. The air supply channel and the sliding groove 16 are independent cavities. The air supply channel can be connected to an external air supply device, which can be a hot air blower or other device, so that the hot air blower or other air supply device can provide hot air to the air blowing port 17 through the air supply channel. In the embodiment of the present application, there are two air blowing ports 17, and both of the air blowing ports 17 are inclined downward toward the central axis of the sand casting barrel 1. The two air blowing ports 17 are symmetrically distributed relative to the central axis of the sand casting barrel 1. The hot air flow blown out from the air blowing ports 17 can sweep the surface of the wax mold 3, thereby accelerating the combination of the slurry and fine sand on the surface of the wax mold 3. The air blowing port 17 is located below the knocking block 4, and the knocking block 4 is on the revolution path of the casting rod 2, while the air blowing port 17 does not contact the casting rod 2, so that the air blowing port 17 will not interfere with the rotation of the casting rod 2. In other embodiments of the present application, the number of the blowing ports 17 can be increased or decreased according to actual conditions, so that the blowing ports 17 can dry the surface of the wax mold 3 from all angles as much as possible when the sand spraying is stopped.

[0031] Furthermore, the air blowing port 17 and the sand shower port 14 operate alternately. The wax mold 3 is first sanded in the sand shower barrel 1, then dried with hot air, and then the sand shower and drying operations are performed alternately. To achieve the alternating sand shower and drying operations, the sand shower barrel 1 is fixed with a contact switch 18 on the inner side wall at one end of the top of the sliding groove 16, and a control unit 19 is also fixed on the outer wall of the sand shower barrel 1. The control unit 19 is electrically connected to the contact switch 18, and the control unit 19 is also electrically connected to the driving electric cylinder that controls the sand shower baffle 6. At the same time, the control unit 19 is also electrically connected to the external air supply device that controls the airflow of the air blowing port 17.

[0032] When the casting rod 2 hits the knocking block 4 during its revolution, it will drive the knocking block 4 to move up together with the slider 5. When the slider 5 moves up, it will touch the contact switch 18. At this time, the contact switch 18 sends a signal to the control unit 19, and the control unit 19 controls the sand sprinkling baffle 6 to slide. At this time, the sand sprinkling baffle 6 blocks the sand sprinkling port 14, and the sand sprinkling port 14 stops working. At the same time, the control switch controls the external air supply equipment to pass a hot air flow to the blowing port 17. The hot air flow is preliminarily dried on the surface of the wax mold 3 through the blowing port 17, thereby improving the bonding efficiency between the fine sand and the silica sol; subsequently, the contact switch 18 is triggered when the casting rod 2 collides with the knocking block 4 next time, the sand sprinkling port 14 is opened to sprinkle sand on the wax mold 3 again, and the blowing port 17 stops blowing air. The sand sprinkling port 14 and the blowing port 17 are alternately triggered as the casting rod 2 hits the knocking block 4, so that the sand sprinkling and hot air drying operations are performed alternately, thereby fully improving the quality of the bonding between the fine sand and the silica sol. This repetition not only improves the sand spraying efficiency, but also significantly enhances the uniformity and stability of the bonding between the slurry and fine sand on the surface of the wax mold 3.

[0033] Further, refer to Figures 5 to 7 The sand-sprinkling cylinder 1 is provided with a screen 7 slidingly mounted on the bottom of the inner cylinder wall. The screen 7 can screen out large piles of sand particles. These piles are formed by the combination of fine sand and silica sol slurry. When the casting rod 2 collides with the knocking block 4, they fall off. If these large piles of fine sand are mixed with the fine sand, they will affect the recycling of the fine sand and reduce the reuse efficiency of the fine sand. The screen 7 can screen out fine sand blocks that have contacted with the silica sol but not firmly bonded. These fine sand blocks are larger than normal fine sand and are therefore more easily intercepted by the screen 7.

[0034] In the embodiment of the present application, the screen 7 is arc-shaped and consistent with the curvature of the sand drench barrel 1, so that the screen 7 slides along the circumferential direction of the sand drench barrel 1. A shaking groove 8 for the sand drench barrel 1 to slide is opened inside the barrel wall of the sand drench barrel 1. The shaking groove 8 is connected to the sliding groove 16, and the slider 5 is fixedly connected to one end of the screen 7 by a connecting rope 71. The connecting rope 71 can be an elastic rope, so that the connecting rope 71 can follow the change according to the change of the distance between the screen 7 and the slider 5, thereby being able to always maintain the connection between the slider 5 and the screen 7, and allowing the screen 7 to move independently relative to the slider 5.

[0035] A second return member 72 is provided at both ends of the screen 7 along the sliding direction. The second return member 72 can be a compression spring. One end of the second return member 72 is fixedly connected to the end of the screen 7, and the other end is fixedly connected to the inner wall of the sand drench barrel 1. At the same time, an elastic impact block 81 is provided on the inner side wall of at least one end of the shaking groove 8 in the longitudinal direction. In the embodiment of the present application, the elastic impact blocks 81 are distributed at both ends of the screen 7 in the sliding direction and are spaced apart from the second return member 72. The elastic impact blocks 81 can be made of elastic rubber.

[0036] The movement of the slider 5 causes the screen 7 to slide. During the sliding process, the screen 7 compresses the second return member 72 and simultaneously strikes the elastic impact block 81, causing the screen 7 to vibrate, effectively screening out large sand particles. The elastic force provided by the second return member 72 prolongs the vibration time of the screen 7. The reciprocating vibration of the screen 7 makes it easier to screen out fine sand that can be reused, ensuring that large sand particles are completely screened out. After the screen 7 vibrates, the fine sand passes through the screen 7 smoothly and falls into the holding tank at the bottom of the sand spraying barrel 1 for reuse, thereby improving the recovery rate and reuse efficiency of the fine sand. In order to further enhance the vibration effect of the slider 5 and the screen 7 as a whole, a return member such as a compression spring can also be provided at the bottom of the slider 5 to enhance the vibration effect of the slider 5 during movement.

[0037] Furthermore, a knocking ball 73 is provided at the bottom of the screen 7. The knocking ball 73 is fixedly connected to the screen 7 via an elastic member 74. The elastic member 74 can be a tension spring or a rubber elastic rope, and the knocking ball 73 can also be made of elastic rubber. The reciprocating sliding of the screen 7 drives the knocking ball 73 to swing back and forth. During the reciprocating swing, the knocking ball 73 will periodically knock the screen 7 from the bottom, further enhancing the vibration effect of the screen 7, thereby improving the screening effect of the screen 7. At the same time, during the reciprocating swing, the knocking ball 73 is continuously vibrated due to the action of the elastic member 74. The swinging and vibration of the knocking ball 73 can further increase the amplitude of the vibration of the screen 7 and effectively extend the vibration time of the screen 7, thereby making it easier to screen out fine sand lumps. In order to ensure that the knocking ball 73 can maintain continuous vibration through the elastic member 74 under the drive of the screen 7, the elastic coefficient of the elastic member 74 can be selected or adjusted according to actual conditions so that the knocking ball 73 can continuously knock the screen 7 during the swinging process.

[0038] The implementation principle of the silica sol investment casting shell making equipment in the embodiment of the present application is as follows: the wax mold 3 can maintain its own rotation and revolution at the same time when pouring sand, so that all parts of the surface of the wax mold 3 can be poured with sand more evenly and comprehensively, greatly improving the quality of the pouring of sand on the wax mold 3; the end of the casting rod 2 that moves upward will collide with the knocking block 4 at intervals, and the casting rod 2 will vibrate itself when colliding with the knocking block 4. The vibration of the casting rod 2 will be transmitted to the wax mold 3 fixed thereon, causing the wax mold 3 to also vibrate instantaneously, thereby quickly shaking off the fine sand that has not yet stabilized on the surface of the wax mold 3; the sand pouring and hot air drying operations are performed alternately to fully improve the quality of the combination of fine sand and silica sol, and the reciprocating screen 7 at the bottom can screen out fine sand that can be reused, and at the same time, the impact block will hit the screen 7 at intervals, further vibrating the screen 7, thereby further screening out larger fine sand blocks.

[0039] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A silica sol investment casting shell making equipment, characterized by: include The sand spraying cylinder has a horizontal axis and a sand spraying port is opened on the top of the inner cylinder wall for spraying sand vertically downwards; The casting rod, whose outer wall is used to fix the wax mold workpiece, is placed in the sand pouring cylinder. The casting rod can simultaneously revolve and rotate. The rotation axis of the casting rod is coaxial with the axis of the sand pouring cylinder, and the revolution axis is located at the center position of the length direction of the casting rod. The casting rod rotates around its own axis. The revolution mechanism and the rotation mechanism are used to drive the casting rod to revolve and rotate respectively.

2. The silica sol investment casting shell making equipment according to claim 1, characterized in that: The revolution mechanism includes a turntable, which is rotatably connected to the inner wall of the sand dredging cylinder, and the rotation axis is coaxial with the axis of the sand dredging cylinder. Two clamping parts that can move relative to each other are movably provided on the side wall of the turntable. The two clamping parts are used to clamp the center position of the casting rod. The self-rotation structure includes a driving roller and an auxiliary roller. The driving roller is rotatably connected to the inner wall of one of the clamping parts, and the rotation axis is perpendicular to the axis of the turntable. The auxiliary roller is rotatably connected to the inner wall of the other clamping part, and the rotation axis is parallel to the driving roller axis. The driving roller and the auxiliary roller are both in contact with the casting rod.

3. The silica sol investment casting shell making equipment according to claim 1, characterized in that: A knocking block is movably provided on the inner wall of the sand-sprinkling cylinder. The knocking block is correspondingly arranged on one side of the upward rotating end of the pouring rod and is located on the revolution path of the pouring rod. When the pouring rod revolves along the axis of the sand-sprinkling cylinder, the upward moving end of the pouring rod collides with the knocking block.

4. The silica sol investment casting shell making equipment according to claim 3, characterized in that: The inside of the sand-drenching barrel is connected to a slider in a circumferential sliding manner. The slider is arc-shaped, and the curvature is consistent with the curvature of the sand-drenching barrel. A sliding groove for the movement of the slider is provided in the barrel of the sand-drenching barrel. The knocking block is connected to the top of the slider through a mounting plate. A first return member is provided on one side of the top of the mounting plate. One end of the first return member is connected to the inner barrel wall of the sand-drenching barrel, and the other end is connected to the top of the mounting plate. The knocking block is made of elastic material.

5. The silica sol investment casting shell making equipment according to claim 4, characterized in that: An air blowing port is provided on the inner wall of the sand shower cylinder, which is used to connect with an external air supply device. The air blowing port is directed toward the central axis of the sand shower cylinder and is used to blow hot air to the surface of the wax mold. The air blowing port and the sliding groove are independent cavities, and the air blowing port and the sand shower port work alternately.

6. The silica sol investment casting shell making equipment according to claim 5, characterized in that: The sand spraying cylinder is provided with a sand spraying baffle at the opening of the sand spraying port, which can block or conduct the sand spraying port during the movement. The sand spraying cylinder is provided with a contact switch on the inner side wall of one end of the top of the sliding groove. The sand spraying cylinder is also provided with a control unit, which is electrically connected to the contact switch. When the slider slides upward, the contact switch is triggered, and the control unit controls the movement of the sand spraying baffle to make the sand discharge intermittently from the sand spraying port.

7. The silica sol investment casting shell making equipment according to claim 4, characterized in that: A screen is movably provided at the bottom of the inner cylinder wall of the sand shower machine for screening out larger sand piles, and a shaking assembly is provided in the sand shower machine. The knocking block drives the screen to shake through the shaking assembly to promote the screening out of the sand pile.

8. The silica sol investment casting shell making equipment according to claim 7, characterized in that: The screen is connected to the sand drench barrel along the circumferential sliding direction of the sand drench barrel. The screen is arc-shaped and consistent with the curvature of the sand drench barrel. A shaking groove for the sand drench barrel to slide is provided inside the sand drench barrel. The shaking assembly includes a connecting rope and an elastic impact block. One end of the screen is connected to the slider through a connecting rope. Second return members are provided at both ends of the screen along the sliding direction. One end of the second return member is connected to the end of the screen, and the other end is connected to the inner wall of the sand drench barrel. An elastic impact block is provided on the inner wall of the sand drench barrel at least at one end in the length direction of the shaking groove.

9. The silica sol investment casting shell making equipment according to claim 8, characterized in that: A knocking ball is provided at the bottom of the screen, and the knocking ball is connected to the screen through an elastic member. The knocking ball is used for knocking the screen at intervals during swinging.

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