Precoated sand shell mold casting equipment

Abstract

The invention relates to the technical field of casting equipment, in particular to precoated sand shell mold casting equipment. The invention provides precoated sand shell mold casting equipment which comprises a base, rolling wheels which are evenly distributed are rotatably connected to the base in the horizontal direction and used for bearing and conveying a lower mold, guide frames which are symmetrically distributed are fixedly connected to the base, and first sliding blocks are slidably connected to the interiors of the guide frames in the vertical direction; an upper die is connected between the symmetrically-distributed first sliding blocks in a horizontal sliding mode, and a support is fixedly connected to the base. The toggle rod linkage mechanism is driven by the cam, so that stable lifting of the upper mold is realized; during mold closing, through rapid approaching and low-speed high-pressure reinforcement, idle stroke is shortened, mold locking force is amplified, and sand shooting leakage is prevented; mold opening is slowly relieved from a dead point, and a shell mold or a mold is prevented from being damaged; the toggle rod is mechanically self-locked after going through the dead point, the motor stops rotating, the mold is still closed, safety and stability are improved, energy consumption is reduced, and the problems that mold opening and closing of traditional equipment are prone to being stuck, and stability is poor are fundamentally solved.

Description

Technical Field

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

[0002] Coated sand, with its advantages of high strength and good dimensional accuracy after heat curing, has become a core material for the mass production of metal castings such as automotive parts and mechanical components. Its shell casting process, due to the smooth surface finish and small machining allowance of the castings, is widely used in industries such as machinery manufacturing and aerospace. However, in actual production, the stability of the mold opening and closing process in existing coated sand shell casting equipment has consistently constrained production efficiency and casting quality.

[0003] Mold opening and closing jamming is a typical failure in coated sand casting, and its core causes mainly fall into two categories: First, design flaws in the mold opening mechanism exacerbate the risk of failure. Traditional equipment often uses a rigid drive structure, lacking buffer control during mold opening. If encountering sand accumulation resistance, excessive speed can easily generate impact loads, leading to mold deformation. Furthermore, the lack of a self-locking function means the mold can accidentally close during shutdowns or sudden power outages, causing not only equipment damage but also potential safety accidents. Second, sand accumulation at the pouring gate causes mold adhesion. During sand injection, some incompletely cured sand particles easily adhere to the inner wall of the upper mold pouring gate. As production batches accumulate, the accumulated sand forms a raised structure, creating an integral adhesion area with the lower mold after mold closing. This generates significant resistance during mold opening, directly causing jamming. These problems not only increase equipment downtime and reduce production efficiency but also cause mold breakage due to forced mold opening, resulting in casting defects such as sand holes and increased material loss costs. At the same time, frequent troubleshooting of system crashes requires a significant amount of manual maintenance time, further reducing the company's production capacity and profits.

[0004] Based on the above situation, there is an urgent need to develop a coated sand shell casting machine that can achieve labor-saving, controllable, self-locking mold opening, and automatically remove residual sand and gravel from key areas. This is of great practical significance for improving the level of production automation, ensuring operational safety, extending mold life, and stabilizing product quality. A coated sand shell casting machine is urgently needed. Summary of the Invention

[0005] In order to overcome the shortcomings of existing coated sand shell casting equipment, such as lack of buffer control and self-locking function in the mold opening mechanism, easy to cause safety accidents due to impact deformation or accidental closure, and easy sand accumulation at the upper mold pouring port, which can cause mold opening and closing jamming, reduce production efficiency and increase casting defects, the technical problem is to provide a coated sand shell casting equipment.

[0006] A coated sand shell casting machine includes a base with evenly distributed rollers rotatably connected to it in a horizontal direction for carrying and conveying a lower mold. Symmetrically distributed guide frames are fixed to the base, and each guide frame has a first sliding block slidably connected vertically. An upper mold is slidably connected horizontally between the symmetrically distributed first sliding blocks. A bracket is fixed to the base, and a motor is mounted on the bracket. The output shaft of the motor is fixed to a cam via a coupling, and a first connecting rod is rotatably connected to the cam. A first sliding frame is slidably connected vertically to the crossbar of the bracket, and the first sliding frame is rotatably connected to the lower end of the first connecting rod. A toggle linkage mechanism with force-amplifying characteristics is provided between the first sliding frame and the upper mold.

[0007] Optionally, the elbow linkage mechanism includes second connecting rods rotatably connected to both ends of the support crossbar, forming the upper connecting rod of the elbow mechanism; symmetrically distributed third connecting rods are rotatably connected to the upper mold, forming the lower connecting rod of the elbow mechanism; each third connecting rod is rotatably connected to the lower end of the corresponding second connecting rod, forming a rotating pair of the elbow mechanism; and symmetrically distributed drive rods are rotatably connected to the lower end of the first sliding frame, each drive rod being rotatably connected to the lower end of the corresponding second connecting rod.

[0008] Optionally, the lower mold is fixed with symmetrically distributed positioning seats, each positioning seat having an insertion hole and a guide slope on its top surface; the upper mold is fixed with symmetrically distributed positioning pins, and the precise snap-fit ​​between the lower mold and the upper mold is achieved through the cooperation of the positioning seats and the positioning pins.

[0009] Optionally, the bracket has a symmetrically distributed multi-section telescopic rod fixed to one side near the lower mold, and a sand-pushing component is fixed between the telescopic ends. The bracket is provided with a drive assembly for controlling the horizontal movement of the sand-pushing component, and a collection assembly for collecting and removing gravel is provided between the guide frames on the right side.

[0010] Optionally, the drive assembly includes electric slide rails symmetrically mounted on the vertical rods of the support. Each electric slide rail has a second sliding block slidably connected vertically. A push frame is rotatably connected between the symmetrically distributed second sliding blocks. The push frame is rotatably connected to the longitudinal rod of the pusher, forming a motion conversion mechanism.

[0011] Optionally, the collection assembly includes first snap-fit ​​members respectively fixed to the right guide frame, and a collection box snap-fitted between the two first snap-fit ​​members.

[0012] Optionally, the bracket is horizontally slidably connected with symmetrically distributed second sliding frames, each with a second snap-fit ​​component fixed at its lower end. Each second snap-fit ​​component can slide horizontally on the base. The upper mold has a snap-fit ​​block fixedly connected to the snap-fit ​​component on the side near the second snap-fit ​​component. Through the cooperation of the snap-fit ​​block and the second snap-fit ​​component, the upper mold and the second sliding frame are linked together.

[0013] Optionally, each of the second sliding frames has a uniformly distributed extrusion block fixed vertically, and the inclined surface of the block is located on the trajectory line of the vertical rod at the top of the push frame moving downward. The upper mold and each of the first sliding blocks are connected by symmetrically distributed springs, which are all wrapped around the upper mold.

[0014] Compared with existing technologies, this invention has the following advantages: This invention achieves smooth and efficient lifting and lowering of the upper mold through a cam-driven toggle linkage mechanism. During the mold closing stage, the toggle mechanism undergoes a rapid approach and low-speed, high-pressure force amplification process, which shortens the idle stroke time and ensures a significant amplification of the final clamping force, effectively preventing sand leakage. During mold opening, the mechanism slowly releases from the dead point position, avoiding damage to the shell or mold caused by excessive speed. Crucially, when the toggle passes the dead point, the mechanism enters a mechanical self-locking state. Even if the motor stops working, the mold remains tightly closed, greatly improving the safety and stability of the equipment while reducing energy consumption. This design fundamentally solves the problems of easy jamming and poor stability in traditional mold opening and closing equipment.

[0015] This invention utilizes an electric slide rail drive to convert vertical motion into horizontal scraping motion of the sand pusher via a pusher frame. This automatically and thoroughly removes residual sand from the sand outlet at the mold closing station and collects it for centralized processing. This function eliminates hard protrusions caused by accumulated sand at the source, effectively avoiding the huge resistance generated during mold opening and significantly reducing the mold jamming failure rate. Its automated operation reduces frequent manual cleaning and downtime intervention, ensuring the continuity and stability of production, thereby greatly improving overall work efficiency.

[0016] This invention utilizes the interaction between the pusher and the inclined extrusion block, combined with a spring reset system, to generate continuous and stable horizontal reciprocating vibrations in the mold during sand injection. This micro-vibration effectively promotes the flowability of the coated sand in the complex cavity, helping it fill every corner and expel gas, significantly improving filling uniformity and compactness. As a result, the formed shell has a more consistent density distribution, effectively preventing defects such as porosity and shrinkage in subsequent castings, and significantly improving the shell forming quality and the dimensional accuracy and mechanical properties of the final casting. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the upper mold, the first sliding block, and the lower mold components of the present invention.

[0019] Figure 3 This is a three-dimensional structural diagram of the electric slide rail, the second sliding block, and the push frame of the present invention.

[0020] Figure 4 This is a three-dimensional structural diagram of the second sliding frame, the pressing block, and the second snap-fit ​​component of the present invention.

[0021] The markings in the attached diagram are as follows: 1. Base; 11. Roller; 12. Lower mold; 121. Positioning seat; 13. Upper mold; 131. Positioning pin; 14. First sliding block; 15. First locking component; 16. Guide frame; 17. Bracket; 2. Motor; 21. Cam; 22. First connecting rod; 23. First sliding frame; 24. Second connecting rod; 25. Drive rod; 26. Third connecting rod; 3. Electric slide rail; 31. Second sliding block; 32. Push frame; 33. Sand pusher; 34. Collection box; 35. Multi-section telescopic rod; 4. Second sliding frame; 41. Extrusion block; 42. Second locking component; 43. Spring. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: A coated sand shell casting equipment, such as Figure 1 and Figure 2 As shown, the device includes a base 1, which serves as the main support for all components of the equipment and ensures overall stability. Rollers 11, evenly distributed along the horizontal direction, are rotatably connected to the base 1 to carry and transport the lower mold 12, enabling rapid positioning and transfer of the lower mold 12. Symmetrically distributed guide frames 16 are fixed to the base 1 to provide precise vertical guidance. Each guide frame 16 has a first sliding block 14 slidably connected vertically. The upper mold 13 is slidably connected horizontally between the symmetrically distributed first sliding blocks 14, enabling fine-tuning and positioning of the upper mold 13 in the horizontal direction.

[0024] A bracket 17 is fixedly connected to the base 1 for mounting the drive assembly; a motor 2 is mounted on the bracket 17, and the output shaft of the motor 2 is fixedly connected to a cam 21 via a coupling, forming the power input mechanism of the device; a first connecting rod 22 is rotatably connected to the cam 21 for converting the rotational motion of the cam 21 into linear motion; a first sliding frame 23 is slidably connected to the horizontal bar of the bracket 17 along the vertical direction for transmitting driving force; the first sliding frame 23 is rotatably connected to the lower end of the first connecting rod 22, converting the pushing and pulling force of the first connecting rod 22 into its own up and down sliding.

[0025] Both ends of the crossbar of the support 17 are rotatably connected to second connecting rods 24, which form the upper connecting rod of the elbow mechanism. The upper mold 13 is rotatably connected to symmetrically distributed third connecting rods 26, which form the lower connecting rod of the elbow mechanism. Each third connecting rod 26 is rotatably connected to the lower end of the corresponding second connecting rod 24, forming a rotating pair of the elbow mechanism. The lower end of the first sliding frame 23 is rotatably connected to symmetrically distributed drive rods 25, which are used to transmit and distribute driving force. Each drive rod 25 is rotatably connected to the lower end of the corresponding second connecting rod 24, and the opening and closing movement of the elbow mechanism is realized by driving the second connecting rod 24.

[0026] The second link 24 and the third link 26 together form an elbow linkage mechanism with force amplification characteristics, which is used to realize the smooth lifting and lowering of the upper mold 13 and provide a mechanical self-locking function at the mold closing position.

[0027] The lower mold 12 is fixedly equipped with symmetrically distributed positioning seats 121 for precise positioning of the mold. Each positioning seat 121 has an insertion hole and a guide slope on its top surface. The upper mold 13 is fixedly equipped with symmetrically distributed positioning pins 131 for cooperating with the positioning seats 121 to achieve precise positioning of the mold. Through the cooperation of the positioning seats 121 and the positioning pins 131, the lower mold 12 and the upper mold 13 are precisely engaged.

[0028] When the upper mold 13 moves downward, it drives the locating pin 131 to move downward simultaneously. When the lowered locating pin 131 contacts the guide slope of the locating seat 121, under the guidance of the slope, the locating pin 131 drives the upper mold 13 to move horizontally relative to the lower mold 12, achieving automatic centering correction until the locating pin 131 is completely aligned with the insertion hole of the locating seat 121. This structural design ensures precise mold closing between the upper mold 13 and the lower mold 12, effectively preventing leakage during the filling of coated sand, and significantly improving the casting quality and yield of the coated sand shell mold.

[0029] The operation process for casting the coated sand shell mold is as follows: First, place the lower mold 12 on the roller 11 and push it to the working position, so that it is directly below the upper mold 13. Start the motor 2 to drive the cam 21 to rotate. When the cam 21 rotates 180° downwards, it drives the first sliding frame 23 to move downwards through the first connecting rod 22. The first sliding frame 23 pushes the second connecting rod 24 and the third connecting rod 26 outwards via the drive rod 25. According to the principle of the toggle system, as the second connecting rod 24 and the third connecting rod 26 approach collinearity, they drive the upper mold 13 and the first sliding block 14 to move downwards along the guide frame 16, achieving stable mold closing.

[0030] After mold closing, the sand injection system is activated, and compressed air injects the coated sand into the cavity through the sand inlet of the upper mold 13, ensuring that the coated sand fully fills the cavity and venting grooves. Under the action of the high-temperature mold, the resin in the coated sand quickly solidifies, forming a high-strength shell. After the shell has solidified, the mold opening process begins.

[0031] The control motor 2 drives the cam 21 to continue rotating 180° upward stroke. The cam 21 drives the first sliding frame 23 to move upward through the first connecting rod 22. The first sliding frame 23 pulls the second connecting rod 24 and the third connecting rod 26 inward through the drive rod 25, so that the elbow mechanism changes from a straight state to a bent state, thereby driving the upper mold 13 and the first sliding block 14 to move upward, and completing the demolding.

[0032] In this device, cam 21, first connecting rod 22, first sliding frame 23, drive rod 25, second connecting rod 24, and third connecting rod 26 together constitute an elbow system with force amplification, buffering, and self-locking functions, used to control the lifting and lowering movement of the upper mold 13. Its advantages are reflected in the following three aspects: In the initial stage of mold closing, the second connecting rod 24 and the third connecting rod 26 form an obtuse angle. The motor 2 drives cam 21 to rotate at a constant speed, which drives the elbow to rotate rapidly through the first sliding frame 23 and drive rod 25, causing the upper mold 13 to quickly approach and shorten the idle stroke time. As the mold closes further, the elbow angle increases and approaches a collinear state of 180°. The mechanism enters the force amplification range, the moving speed of the upper mold 13 slows down, and the output clamping force is significantly amplified, ensuring that the mold fits tightly and effectively preventing sand leakage during sand injection.

[0033] At the initial stage of mold opening, the toggle mechanism disengages from the collinear state, and the upper mold 13 slowly detaches to overcome the adhesion between the coated sand shell mold and the mold, avoiding damage to the shell mold or mold due to excessive speed. As the toggle continues to retract, the moving speed of the upper mold 13 increases, quickly resetting to prepare for the next cycle.

[0034] When the elbow bar passes the collinear "dead point" position, the mechanism enters a self-locking state. At this time, the force exerted by the pressure inside the cavity on the mold will further lock the elbow bar. Even if motor 2 stops driving, the mold can still remain tightly closed, effectively ensuring mold closing stability and equipment safety, while reducing energy consumption.

[0035] In summary, this elbow linkage mechanism achieves an organic combination of rapid motion during idle stroke and low-speed, high-pressure motion during working stroke through the dynamic conversion of motion and force, thereby improving equipment operating efficiency while ensuring molding quality and operational safety.

[0036] As described in the background section, after the coated sand is shot-filled, some incompletely cured sand particles tend to adhere to the inner wall of the upper mold's 13 pouring port and accumulate with each production batch, forming a raised structure. After the mold is closed, this forms an adhesion area with the lower mold, generating significant resistance during mold opening and directly causing the mold to jam. This necessitates frequent machine stops for manual cleaning, significantly reducing production efficiency. Furthermore, forcibly opening the mold can easily damage the sand mold, leading to casting defects such as sand holes. Therefore, it is necessary to design a cleaning mechanism that can automatically remove accumulated sand from the upper mold's 13 pouring port to effectively prevent mold adhesion and mold jamming caused by sand accumulation, thereby improving production efficiency and casting quality.

[0037] like Figure 3 As shown, specifically, the bracket 17 is fixedly connected to a symmetrically distributed multi-section telescopic rod 35 on the side near the lower mold 12, which is used to provide horizontal guidance and support. A sand-pushing component 33 is fixedly connected between its telescopic ends, which is used to scrape the sand accumulated at the sand outlet. The bracket 17 is provided with a drive assembly for controlling the horizontal movement of the sand-pushing component 33, and a collection assembly for collecting and removing gravel is provided between the guide frames 16 on the right side.

[0038] The drive assembly includes electric slide rails 3 symmetrically mounted on the vertical rods of the bracket 17 to provide vertical driving force. Each electric slide rail 3 has a second sliding block 31 slidably connected vertically. The symmetrically distributed second sliding blocks 31 are rotatably connected to a pusher frame 32 to convert vertical motion into horizontal motion. The pusher frame 32 is rotatably connected to the longitudinal rod of the pusher 33 to form a motion conversion mechanism.

[0039] The collection assembly includes first snap-fit ​​pieces 15 fixed to the right guide frame 16 for detachably fixing the collection container; a collection box 34 is snapped between the two first snap-fit ​​pieces 15 for holding the cleaned sand for centralized processing.

[0040] When the coated sand is filled and the upper mold 13 is in the closed position, uncured sand may remain around the sand outlet. At this time, the electric slide rail 3 is activated, driving the second sliding block 31 to move downward. The second sliding block 31 converts the vertical movement into horizontal movement through the push frame 32, causing the sand pusher 33 to move to the left along the top surface of the upper mold 13. At the same time, the telescopic ends of the multi-section telescopic rod 35 extend to the left to provide stable support.

[0041] During its movement, the sand pusher 33 pushes the accumulated sand around the sand outlet to the left, causing it to fall into the collection box 34, thus completing the automatic cleaning of the sand outlet. After cleaning, the electric slide rail 3 drives the second sliding block 31 to move upward and reset, and the pusher frame 32 drives the sand pusher 33 to move to the right and reset. The telescopic end of the multi-section telescopic rod 35 then retracts to the right and returns to its initial state.

[0042] When the collection box 34 is full of sand and gravel, the operator can remove it from the first clip 15, clean it, and reinstall it to achieve continuous operation.

[0043] This cleaning mechanism uses an electrically driven sand-pushing device to automatically clean the sand outlet directly at the mold closing station, effectively preventing the mold body from sticking due to sand accumulation and eliminating the potential for mold jamming at the source. Its compact structure and simple operation, combined with close integration with the production process, significantly improve the stability of equipment operation and production efficiency.

[0044] Example 2: During sand injection, the coated sand is prone to gaps in filling due to airflow obstruction or insufficient fluidity at the corners of the mold cavity. This results in weak areas in the formed shell, which can lead to defects such as porosity and shrinkage cavities during subsequent molten metal pouring, affecting the quality and mechanical properties of the casting. Therefore, it is necessary to design a oscillating mechanism that causes the mold to sway horizontally after closing during sand injection. This dynamic filling improves the uniformity and compactness of the coated sand distribution within the mold cavity, thereby improving the shell forming quality and casting accuracy.

[0045] like Figure 4 As shown, specifically, the bracket 17 is horizontally slidably connected with symmetrically distributed second sliding frames 4 for transmitting horizontal vibration force. Each of these frames has a second snap-fit ​​component 42 fixedly connected to its lower end. Each second snap-fit ​​component 42 can slide horizontally on the base 1. The upper mold 13 has a snap-fit ​​block fixedly connected to the snap-fit ​​component 42 on the side near the snap-fit ​​component 42. Through the cooperation of the snap-fit ​​block and the second snap-fit ​​component 42, the upper mold 13 and the second sliding frame 4 are linked together.

[0046] Each of the second sliding frames 4 has a uniformly distributed pressing block 41 fixed vertically, and its inclined surface is located on the trajectory line of the vertical rod at the top of the push frame 32. This block is used to convert the movement of the push frame 32 into a horizontal vibration force. The upper mold 13 and each of the first sliding blocks 14 are connected by symmetrically distributed springs 43, which are used to provide a restoring force and achieve elastic suspension to avoid rigid collision of the mold. The springs 43 are all wrapped around the upper mold 13 to ensure that the extension and contraction direction of the springs 43 is stable.

[0047] After the mold is closed, the upper mold 13 engages with the second locking piece 42 via the locking block. When the electric slide rail 3 controls the second sliding block 31 to move downward, the push frame 32 tilts to the left, and its top longitudinal rod contacts the upper inclined surface of the extrusion block 41.

[0048] Under the guidance of the inclined plane, the longitudinal rod of the push frame 32 pushes the extrusion block 41 to move the second sliding frame 4 to the left, and then drives the entire mold closing device (upper mold 13 and lower mold 12) to move to the left relative to the first sliding block 14 through the second snap-fit ​​part 42 and the snap-fit ​​block. At this time, the spring 43 is compressed and stores energy.

[0049] When the longitudinal rod of the pusher frame 32 passes the highest point of the extrusion block 41, the mold closing device quickly moves to the right and resets under the restoring force of the spring 43. As the pusher frame 32 continues to move downward, its longitudinal rod interacts cyclically with the subsequent extrusion block 41, causing the mold closing device to generate continuous and stable horizontal reciprocating vibration.

[0050] The vibration causes the coated sand in the cavity to redistribute and further compact during the filling process, effectively eliminating filling dead corners and improving the filling density and uniformity of various parts of the cavity. When the electric slide rail 3 controls the second sliding block 31 to move upward and reset, the push frame 32 interacts with the extrusion block 41 again, generating a new round of vibration, further optimizing the filling effect.

[0051] This oscillating mechanism cleverly utilizes existing sand-pushing drive components, achieving automatic horizontal vibration of the mold during sand injection through a simple inclined plane extrusion and spring 43 reset mechanism. This design significantly improves the flowability and filling density of coated sand in complex cavities, effectively avoiding casting defects caused by uneven filling, improving shell molding quality and casting dimensional accuracy, and requires no additional power source, featuring a compact structure and reliable operation.

[0052] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A coated sand shell casting device, characterized in that: The system includes a base (1) on which evenly distributed rollers (11) are rotatably connected in the horizontal direction to support and transport the lower mold (12). A symmetrically distributed guide frame (16) is fixed on the base (1). Each guide frame (16) is vertically slidably connected to a first sliding block (14). The symmetrically distributed first sliding blocks (14) are horizontally slidably connected to an upper mold (13). A bracket (17) is fixed on the base (1). A motor (2) is installed on the bracket (17). The output shaft of the motor (2) is fixed to a cam (21) through a coupling. A first connecting rod (22) is rotatably connected to the cam (21). A first sliding frame (23) is vertically slidably connected to the crossbar of the bracket (17). The first sliding frame (23) is rotatably connected to the lower end of the first connecting rod (22). An elbow linkage mechanism with force amplification characteristics is provided between the first sliding frame (23) and the upper mold (13).

2. The coated sand shell casting equipment according to claim 1, characterized in that: The elbow linkage mechanism includes second connecting rods (24) that are rotatably connected to both ends of the crossbar of the support (17) to form the upper connecting rod of the elbow mechanism. The upper mold (13) is rotatably connected to symmetrically distributed third connecting rods (26) to form the lower connecting rod of the elbow mechanism. Each third connecting rod (26) is rotatably connected to the lower end of the corresponding second connecting rod (24) to form a rotating pair of the elbow mechanism. The lower end of the first sliding frame (23) is rotatably connected to symmetrically distributed drive rods (25), and each drive rod (25) is rotatably connected to the lower end of the corresponding second connecting rod (24).

3. The coated sand shell casting equipment according to claim 1, characterized in that: The lower mold (12) is fixed with symmetrically distributed positioning seats (121), each positioning seat (121) has an insertion hole, and the top surface of each positioning seat (121) is provided with a guide slope; the upper mold (13) is fixed with symmetrically distributed positioning pins (131), and the precise snap-fit ​​between the lower mold (12) and the upper mold (13) is achieved through the cooperation of the positioning seats (121) and the positioning pins (131).

4. The coated sand shell casting equipment according to claim 1, characterized in that: The bracket (17) has a symmetrically distributed multi-section telescopic rod (35) fixedly connected to one side near the lower mold (12), and a sand pusher (33) is fixedly connected between the telescopic ends. The bracket (17) is provided with a drive assembly for controlling the horizontal movement of the sand pusher (33), and a collection assembly for collecting and removing gravel is provided between the guide frames (16) on the right side.

5. The coated sand shell casting equipment according to claim 4, characterized in that: The drive assembly includes electric slide rails (3) symmetrically mounted on the vertical rod of the bracket (17). Each electric slide rail (3) is vertically connected with a second sliding block (31). The symmetrically distributed second sliding blocks (31) are rotatably connected with a pusher frame (32). The pusher frame (32) is rotatably connected to the longitudinal rod of the pusher (33) to form a motion conversion mechanism.

6. The coated sand shell casting equipment according to claim 4, characterized in that: The collection assembly includes first snap-fit ​​pieces (15) respectively fixed to the right guide frame (16), and a collection box (34) snap-fitted between the two first snap-fit ​​pieces (15).

7. The coated sand shell casting equipment according to claim 1, characterized in that: The bracket (17) is horizontally slidably connected with symmetrically distributed second sliding frames (4), each of which is fixedly connected to a second snap-fit ​​piece (42) at its lower end. Each second snap-fit ​​piece (42) can slide horizontally on the base (1). The upper mold (13) is fixedly connected to a snap-fit ​​block that matches the snap-fit ​​piece (42) on the side near the second snap-fit ​​piece (42). Through the cooperation of the snap-fit ​​block and the second snap-fit ​​piece (42), the upper mold (13) and the second sliding frame (4) are linked together.

8. The coated sand shell casting equipment according to claim 7, characterized in that: Each of the second sliding frames (4) has a uniformly distributed extrusion block (41) fixed vertically, and its inclined surface is located on the trajectory line of the vertical rod at the top of the push frame (32) moving downward. The upper mold (13) and each of the first sliding blocks (14) are connected by symmetrically distributed springs (43), which are all wrapped around the upper mold (13).

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