A coated sand core shooting machine for automobile castings

Abstract

The automobile casting precoated sand core shooting machine alternately operates through the double lower molds, so that the sand shooting process and the demolding process are simultaneously performed. The guide assembly is arranged on the frame, the lower part of the guide assembly is provided with a lower bottom plate, the upper part of the guide column assembly is provided with an upper bottom plate, two mold turning mechanisms are symmetrically arranged on the connecting frame, the mold turning mechanisms are provided with the lower molds, the upper part of the upper bottom plate is provided with a sand shooting cylinder, the sand shooting cylinder is connected with a sand shooting cylinder driving mechanism, the sand shooting cylinder driving mechanism drives the sand shooting cylinder to move up and down, the sand shooting cylinder is connected with a nozzle, the output port of the nozzle is provided with a sand shooting pipe, and the work position driving mechanism drives the two lower molds to move between different work positions. Through the alternate operation of the front lower mold and the rear lower mold, the sand shooting, curing and demolding processes are performed in parallel, and the production efficiency of the automobile casting sand core is improved. The mold support plate is driven by the mold turning mechanism to realize 180° stable turning, so that the formed sand core can be completely and reliably demolded from the lower mold.

Description

Technical Field

[0001] This invention relates to the field of casting equipment technology, and in particular to a coated sand core shooting machine for automotive castings. Background Technology

[0002] The coated sand core shooter is a key piece of equipment used in automotive casting production to manufacture sand cores. Its working principle involves using compressed air to propel coated sand cores at high speed into a heated mold cavity, where it solidifies to form the desired sand core. The quality of the sand core directly determines the dimensional accuracy and surface quality of the automotive castings; therefore, the performance of the core shooter has a significant impact on the entire casting production process.

[0003] Most existing coated sand core shooting machines adopt a single-station structure, where sand core shooting, curing, and demolding are completed sequentially at the same or adjacent stations. This has the following drawbacks: Low production efficiency: Traditional core shooting machines typically use a single mold for sand shooting, curing, and demolding operations, requiring waiting between processes and resulting in long production cycles, which cannot meet the large-scale, high-efficiency production needs of automotive castings; Difficult demolding: Existing core shooting machines typically use direct lifting or simple flipping methods for demolding the lower mold. For sand cores with complex shapes, thin walls, or deep cavity structures, problems such as sand core cracking and deformation are prone to occur, leading to a high scrap rate; Poor positioning accuracy: Existing mold positioning often uses simple guide pillars, resulting in limited positioning accuracy. Mold misalignment is prone to occur during sand shooting, leading to out-of-tolerance sand core dimensions and affecting the quality of subsequent castings; Serious core sand waste: During sand shooting, excess uncured core sand easily overflows from the mold, not only wasting raw materials but also polluting the working environment and affecting the operating accuracy and stability of the equipment. Low level of automation: Traditional core shooting machines rely heavily on manual operation to complete processes such as core transfer and inspection, which is labor-intensive, has low production efficiency, and makes it difficult to guarantee product consistency. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the purpose of this invention is to provide a coating sand core shooting machine for automotive castings. By setting up a double lower mold to operate alternately, the sand shooting process and the demolding process are carried out simultaneously, realizing continuous production and shortening the production cycle.

[0005] The solution is a sand core shooting machine for coating automotive castings, comprising a frame, a guide assembly on the frame, a lower base plate at the lower part of the guide assembly, an upper base plate on the upper part of the guide column assembly, two parallel transverse guide rails mounted above the middle of the lower base plate, a connecting frame slidably mounted on the transverse guide rails, two mold-flipping mechanisms symmetrically mounted on the connecting frame, each mold-flipping mechanism having a lower mold mounted on it, an upper mold plate mounted directly below the upper base plate, an upper mold mounted below the upper mold plate, the upper mold plate being slidably connected to the guide assembly, a sand-shooting hole on the upper mold, a mold drive system connected to the upper mold plate to drive its up-and-down movement, a sand-shooting cylinder above the upper base plate, a sand-shooting cylinder drive mechanism connected to the sand-shooting cylinder to drive its up-and-down movement, a sand-shooting head connected to the sand-shooting cylinder, a sandblasting pipe mounted at the output port of the sand-shooting head, and a station drive mechanism mounted on the frame connected to the connecting frame, the station drive mechanism driving the two lower molds to move between different stations.

[0006] Preferably, the flipping mechanism includes a rotating shaft located above the connecting frame and a mold support plate. The mold support plate is fixedly connected to the rotating shaft. One end of the rotating shaft is mounted on the connecting frame through a bearing seat, and the other end is connected to an electric turntable between the rotating shaft and the frame. The mold support plates of the two flipping mechanisms are opposite to each other, and both rotating shafts are located outside the two support plates.

[0007] Preferably, the mold driving mechanism includes a mold driving cylinder. A guide rod is installed on both sides of the upper mold plate. The guide rod passes upward through the upper base plate and is slidably connected to the upper base plate. A guide rod connecting plate is fixedly connected between the upper parts of the two guide rods. A base plate bracket is fixedly installed on the upper part of the upper base plate. The mold driving cylinder is installed on the base plate bracket. The cylinder rod of the mold driving cylinder is fixedly connected to the guide rod connecting plate.

[0008] Preferably, the sand-shooting cylinder drive mechanism includes a sand-shooting cylinder cylinder mounted on a base plate support, a sand-shooting cylinder connecting plate on one side of the sand-shooting cylinder, a cylinder rod of the sand-shooting cylinder cylinder being fixedly connected to the sand-shooting cylinder connecting plate, and the sand-shooting cylinder being located between two guide rods and below the guide rod connecting plate.

[0009] Preferably, the connecting cylinder is covered with an adsorption hood, which is open downwards and has its lower end higher than the lower end of the connecting cylinder. The connecting cylinder passes upwards through the adsorption hood, and the connection between the upper part of the adsorption hood and the connecting cylinder is sealed. One side of the adsorption hood is connected to a negative pressure adsorption system.

[0010] Preferably, the lower part of the mold support plate is provided on an electromagnet mounted on a connecting frame.

[0011] Preferably, the station drive mechanism adopts a synchronous belt module, the connecting frame is located above the synchronous belt module and is fixedly connected to the slider of the synchronous belt module, and the synchronous belt module is installed on the frame.

[0012] Preferably, the lower base plate is located above the synchronous belt module, and the lower base plate is provided with a through groove, which divides the lower base plate into two symmetrical parts, and two transverse guide rails are located on both sides of the through groove.

[0013] Preferably, the lower part of the bottom plate is provided with a positioning plate, the positioning plate has at least two positioning pins, the number of positioning pins is even, the positioning pins are symmetrically arranged on both sides of the through groove, the bottom plate is provided with positioning holes with the same number of positioning pins, the positioning pins pass through the corresponding positioning holes, the bottom of the positioning plate is connected to a positioning drive cylinder, and the bottom of the mold support plate is equipped with positioning sleeves that cooperate with the positioning pins, the end of the positioning pins is a tapered structure.

[0014] The beneficial effects of this invention are as follows: Significantly improved production efficiency: By alternating between the front and rear lower molds, the sand injection, curing, and demolding processes are carried out in parallel, achieving continuous production and significantly improving the production efficiency of automotive casting sand cores; Significantly improved demolding reliability: The mold flipping mechanism drives the mold support plate to achieve a smooth 180° rotation, allowing the formed sand core to be completely and reliably demolded from the lower mold, effectively reducing the breakage rate and scrap rate of the sand core; High mold positioning accuracy: The conical end of the positioning pin can smoothly insert into the positioning sleeve, and in conjunction with the electromagnet's adsorption and fixation of the mold support plate, precise alignment between the lower and upper molds is achieved, improving the dimensional accuracy and casting quality of the sand core; High core sand utilization rate. Clean working environment: The negative pressure adsorption system can effectively recover the unsolidified core sand overflowing during the sand shooting process, reducing the impact of core sand on equipment accuracy and maintaining a clean working environment; High degree of automation: Through the coordinated control of the station drive mechanism, mold drive system, sand shooting cylinder drive mechanism, mold flipping mechanism and positioning drive system, the entire process of sand core from sand shooting, solidification, demolding to transfer is automated, reducing manual labor intensity and improving product consistency and production stability; Compact equipment structure and reliable operation: The guide components, transverse guide rails, mold cylinders, sand shooting cylinders and other components are reasonably arranged, the overall equipment structure is compact, the movements are coordinated, the operation is highly reliable, and it is easy to maintain and repair. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 For the present invention Figure 1 Left-view diagram.

[0017] Figure 3 For the present invention Figure 1 A three-dimensional schematic diagram.

[0018] Figure 4 This is a schematic diagram of the sand-shooting cylinder part of the present invention.

[0019] Figure 5 For the present invention Figure 4 A three-dimensional schematic diagram.

[0020] Figure 6 This is a three-dimensional schematic diagram of the mold part of the present invention.

[0021] Figure 7 This is a three-dimensional schematic diagram of the locating pin and the lower base plate of the present invention.

[0022] Figure 8 This is a three-dimensional schematic diagram of the locating pin and locating sleeve of the present invention. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Depend on Figures 1 to 8Provided is a sand core shooting machine for coating automotive castings, comprising a frame 1, a guide assembly 2 on the frame 1, a lower base plate 3 at the lower part of the guide assembly 2, and an upper base plate 4 mounted on the upper part of the guide column assembly. The lower base plate 3 has two parallel transverse guide rails 5 mounted above its center, and a connecting frame 6 is slidably mounted on the transverse guide rails 5. Two mold-flipping mechanisms are symmetrically mounted on the connecting frame 6, each mold-flipping mechanism having a lower mold 7 mounted on it. An upper mold plate 8 is mounted directly below the upper base plate 4, and an upper mold 9 is mounted below the upper mold plate 8. The upper mold plate 8 is slidably connected to the guide assembly 2. The upper mold 9 has sand-shooting holes, and the upper mold plate 8 is connected to a mold drive system that drives its vertical movement. A sand-shooting cylinder 10 is located above the upper base plate 4, and the sand-shooting cylinder 10 is connected to a sand-shooting... The sand-shooting cylinder 10 is driven by a mechanism that moves the sand-shooting cylinder 10 up and down. The sand-shooting cylinder 10 is connected to an injection head, and a sandblasting pipe 11 is installed at the output port of the injection head. The sandblasting pipe 11 is matched with the sand-shooting hole. After the sand-shooting cylinder 10 moves downward to the position where the upper mold 9 is conveying core sand, the sandblasting pipe 11 is aligned with the sand-shooting hole, and the core sand in the sand-shooting cylinder 10 is conveyed into the mold cavity between the upper mold 9 and the lower mold 7. The sand-shooting cylinder 10 is connected to a pneumatic system to provide sand-shooting power. A core sand conveying system is connected between the sand-shooting cylinder 10 and the sand hopper 21. The core sand conveying system conveys a fixed amount of core sand from the sand hopper 21 into the sand-shooting cylinder 10 at a time. The connecting frame 6 is connected to a station drive mechanism installed on the frame 1. The station drive mechanism drives the two lower molds 7 to move between different stations. A mold-flipping mechanism is installed on both sides of the connecting frame 6. The symmetrical plane of the two mold-flipping mechanisms is perpendicular to the movement direction of the connecting frame 6. A lower mold 7 is connected to each mold-flipping mechanism. For ease of description of the movement relationship later, the one located in front is the front lower mold 7, and the one located in the back is the rear lower mold 7. The station drive mechanism simultaneously drives the front lower mold 7 and the rear lower mold 7 to move back and forth along the transverse guide rail 5 to complete the different lower molds 7 cooperating with the upper mold 9. After the station drive mechanism carries the front lower mold 7 into the space directly below the upper mold 9, the sand-shooting cylinder 10 moves downward under the drive of the sand-shooting cylinder 10 drive mechanism, so that the sand-blasting pipe 11 aligns with the sand-shooting hole of the upper mold 9. Then, driven by the pneumatic system, the core sand in the sand-shooting cylinder 10 enters the cavity between the upper mold 9 and the front lower mold 7. Then, under the heating of the upper mold 9 and the front lower mold 7, the core sand solidifies and forms. After the core is formed, the station drive mechanism drives the connecting frame 6 forward to the rear lower mold 7 and enters directly below the upper mold 9. At this time, the front lower mold 7 enters the front demolding station. While the front lower mold 7 is demolding, the rear lower mold 7 performs sand injection. A front belt conveyor is provided below the front demolding station. The front lower mold 7 is rotated 180 degrees by the flipping mechanism connected to it, flipping the formed sand core on the front lower mold 7 onto the front belt conveyor. At this time, the rear lower mold 7 completes the core sand injection operation.Both the front lower mold 7 and the rear lower mold 7 are equipped with demolding mechanisms. These mechanisms move with the forward and backward movement of the connecting frame 6. This is a standard feature in the mold industry. After the lower mold 7 and the upper mold 9 separate, the workpiece is demolded and remains on the lower mold 7, moving with it. When the flipping mechanism flips the lower mold 7, the workpiece automatically falls to the designated position under its own weight. The station drive mechanism moves the connecting frame 6 backward, and the front lower mold 7 moves directly below the lower upper mold 9. At this time, the rear lower mold 7 enters the rear demolding station. Directly below the rear demolding station is a rear belt conveyor. The molding sand core on the rear lower mold 7 is driven by the flipping mechanism and enters the rear belt conveyor, where it is transported to the next process.

[0025] The mold flipping mechanism includes a rotating shaft 12 located above the connecting frame 6 and a mold support plate 13. The mold support plate 13 is fixedly connected to the rotating shaft 12. One end of the rotating shaft 12 is mounted on the connecting frame 6 through a bearing seat, and the other end is installed between the rotating shaft 12 and the frame 1 with an electric turntable 14. The mold support plates 13 of the two flipping mechanisms are opposite to each other, and the two rotating shafts 12 are located on the outside of the two support plates. The electric turntable 14 is equipped with a turntable motor. The turntable motor drives the rotating shaft 12 to rotate through the transmission mechanism inside the electric turntable 14, thereby driving the mold support plate 13 to flip. The flipping of the mold support plate 13 drives the lower mold 7 to flip. The two mold support plates 13 are facing each other. When the two flipping mechanisms are flipped, they flip in the opposite direction. That is, the flipping mechanism on the front side drives the front lower mold 7 to flip forward, and the flipping mechanism on the rear side drives the rear lower mold 7 to flip backward, which facilitates the demolding and transfer of the molding sand core on the lower mold 7.

[0026] The mold driving mechanism includes a mold driving cylinder 15. A guide rod 16 is installed on each side of the upper mold plate 8. The guide rod 16 passes upward through the upper base plate 4 and slides vertically with it. A guide rod connecting plate 17 is fixedly connected between the upper parts of the two guide rods 16. A base plate bracket 18 is fixedly installed on the upper part of the upper base plate 4. The mold driving cylinder 15 is mounted on the base plate bracket 18, and the cylinder rod of the mold driving cylinder 15 is fixedly connected to the guide rod connecting plate 17. The mold driving cylinder 15 drives the guide rods 16 to move up and down through the guide rod connecting plate, which in turn drives the upper mold plate 8 and the upper mold 9 installed below the upper mold plate 8 to move up and down, causing the upper mold 9 to move closer to and away from the lower mold 7, completing the mold closing and demolding operations. The axis of the mold driving cylinder 15 coincides with the center line of the upper mold 9 to prevent the upper mold 9 from deflecting under force during mold closing and to reduce wear between molds.

[0027] The driving mechanism of the sand-shooting cylinder 10 includes a sand-shooting cylinder 19 mounted on the base plate bracket 18. A sand-shooting cylinder 10 connecting plate is provided on one side of the sand-shooting cylinder 10. The cylinder rod of the sand-shooting cylinder 19 is fixedly connected to the sand-shooting cylinder 10 connecting plate. The sand-shooting cylinder 10 is located between two guide rods 16 and below the guide rod connecting plate 17. The mold driving cylinder 15 drives the guide rod connecting plate 17 to move up and down, which in turn drives the upper mold plate 8 and the upper mold 9 to move up and down through the guide rods 16. The sand-shooting cylinder 19 drives the sand-shooting cylinder 10 to move up and down. The guide rods 16 are located on both sides of the sand-shooting cylinder 10 to avoid interference between the movement of the sand-shooting cylinder 10 and the upper mold 9.

[0028] The connecting cylinder is fitted with an adsorption hood 27, which opens downwards and has its lower end higher than the lower end of the connecting cylinder. The connecting cylinder passes upwards through the adsorption hood 27, and the upper part of the adsorption hood 27 is sealed at the connection with the connecting cylinder. A negative pressure adsorption system is connected to one side of the adsorption hood 27. After the core sand solidifies between the upper mold 9 and the lower mold 7, the sand-shooting cylinder 10 is driven upwards by the driving mechanism, causing the connecting cylinder to disengage from the sand-shooting hole of the upper mold 9. Then, the negative pressure adsorption system works to adsorb the excess unsolidified core sand on the upper part of the upper mold 9. The adsorbed core sand can be reused, while reducing core sand overflow, keeping the working environment clean, and reducing the impact of core sand overflow on equipment accuracy.

[0029] The lower part of the mold support plate 13 is provided with an electromagnet 20 mounted on the connecting frame 6. The electromagnet 20 is located below the side of the mold support plate 13 opposite to the rotating shaft 12. When the flipping mechanism needs to flip the mold support plate 13, the electromagnet 20 is de-energized. When the mold support plate 13 is flipped to the connecting frame 6 by the flipping mechanism, the electromagnet 20 is energized, and the side of the mold support plate 13 opposite to the rotating shaft 12 is attracted by the electromagnet 20, thus fixing the side of the mold support plate 13 opposite to the rotating shaft 12. When it is necessary to flip the mold support plate 13 to transfer the workpiece on the lower mold 7, the electromagnet 20 is de-energized, the electromagnet is released from its restraint on the mold support plate 13, and the flipping mechanism can then flip the lower mold 7.

[0030] The workstation drive mechanism adopts a synchronous belt module 22. The connecting frame 6 is located above the synchronous belt module 22 and is fixedly connected to the slider of the synchronous belt module 22. The synchronous belt module 22 is installed on the frame 1.

[0031] The lower base plate 3 is located above the synchronous belt module 22. The lower base plate 3 is provided with a through groove 301, which divides the lower base plate 3 into two symmetrical parts. Two transverse guide rails 5 are located on both sides of the through groove 301.

[0032] When the upper mold 9 and the lower mold 7 are closed, the mold drive cylinder 15 needs to apply a large downward force to the mold. The two transverse guide rails 5 mainly bear this force to prevent the instantaneous force from affecting the synchronous belt module 22. The synchronous belt module 22 mainly consists of a synchronous belt, synchronous pulleys, a drive shaft, a slider, and a synchronous motor. The motor drives the two synchronous pulleys to rotate through the drive shaft, which in turn causes the synchronous pulleys wound on the synchronous pulleys to rotate synchronously, thereby causing the synchronous slider fixed on the synchronous belt to move, thus driving the connecting frame 6 to move.

[0033] The lower base plate 3 has a positioning plate 23 at its lower part, with at least two positioning pins 24 on the positioning plate 23. The number of positioning pins 24 is even, and the positioning pins 24 are symmetrically arranged on both sides of the through groove 301. The lower base plate 3 has positioning holes with the same number of positioning pins 24, through which the positioning pins 24 pass. A positioning drive cylinder 26 is connected to the bottom of the positioning plate 23. The bottom of each mold support plate 13 is equipped with a positioning sleeve 25 that cooperates with the positioning pins 24. The end of the positioning pin 24 has a tapered structure. The positioning drive cylinder 26 is mounted on the frame 1. After the lower mold 7 moves directly below the upper mold 9, the positioning pins 24, driven by the positioning cylinder, enter the positioning sleeve 25 at the lower part of the mold support plate 13 corresponding to the mold, thus constraining the mold support plate 13 and accurately positioning it. This ensures accurate positioning of the upper and lower molds 7 and improves the casting accuracy of the product. After the sand core solidifies and the mold is demolded, the positioning pins 24 disengage from the positioning sleeve 25, the flipping mechanism is released from its restraint, and it moves under the drive of the synchronous belt module 22. Four locating pins 24 are provided, and the four locating pins 24 are symmetrical about the through groove 301. Four locating sleeves 25 on the mold support plate 13 are symmetrical about the center of the mold. After the locating pins 24 are inserted into the corresponding locating sleeves 25, they prevent asymmetrical flipping forces from being generated on the mold support plate 13.

[0034] The beneficial effects of this invention are as follows: Significantly improved production efficiency: By alternating between the front and rear lower molds 7, the sand injection, curing, and demolding processes are carried out in parallel, achieving continuous production and significantly improving the production efficiency of automotive casting sand cores; Significantly improved demolding reliability: The mold flipping mechanism drives the mold support plate 13 to achieve a smooth 180° rotation, allowing the formed sand core to be completely and reliably demolded from the lower mold 7, effectively reducing the breakage rate and scrap rate of the sand core; High mold positioning accuracy: The tapered end of the positioning pin 24 can smoothly insert into the positioning sleeve 25, and in conjunction with the electromagnet 20 adsorbing and fixing the mold support plate 13, precise alignment of the lower mold 7 and the upper mold 9 is achieved, improving the dimensional accuracy and casting quality of the sand core; Core sand... High utilization rate and clean working environment: The negative pressure adsorption system can effectively recover the unsolidified core sand overflowing during the sand shooting process, reducing the impact of core sand on equipment accuracy and maintaining a clean working environment; High degree of automation: Through the coordinated control of the station drive mechanism, mold drive system, sand shooting cylinder 10 drive mechanism, mold flipping mechanism and positioning drive system, the entire process of sand core from sand shooting, solidification, demolding to transfer is automated, reducing manual labor intensity and improving product consistency and production stability; Compact equipment structure and reliable operation: The layout of components such as guide component 2, transverse guide rail 5, mold cylinder, sand shooting cylinder 19 is reasonable, the overall equipment structure is compact, the action is coordinated, the operation is highly reliable, and it is easy to maintain and repair.

[0035] The embodiments described above are not intended to limit the scope of the present invention. Any modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the inventive concept should be included within the scope of protection defined by the claims of the present invention.

Claims

1. A coating sand core shooting machine for automotive castings, comprising a frame (1), a guide assembly (2) provided on the frame (1), a lower base plate (3) provided at the lower part of the guide assembly (2), and an upper base plate (4) installed at the upper part of the guide column assembly, characterized in that, Two parallel transverse guide rails (5) are installed above the middle of the lower base plate (3). A connecting frame (6) is slidably installed on the transverse guide rails (5). Two mold-flipping mechanisms are symmetrically installed on the connecting frame (6). A lower mold (7) is installed on each mold-flipping mechanism. An upper mold plate (8) is installed directly below the upper base plate (4). An upper mold (9) is installed on the lower part of the upper mold plate (8). The upper mold plate (8) is slidably connected to the guide assembly (2). The upper mold (9) is provided with a sand-shooting hole. The upper mold plate (8) is connected to the guide assembly (2). A mold drive system is connected to drive the mold to move up and down. A sand-shooting cylinder (10) is provided above the upper base plate (4). The sand-shooting cylinder (10) is connected to a sand-shooting cylinder (10) drive mechanism. The sand-shooting cylinder (10) drive mechanism drives the sand-shooting cylinder (10) to move up and down. The sand-shooting cylinder (10) is connected to a spray head. A sandblasting pipe (11) is installed at the output port of the spray head. The connecting frame (6) is connected to a station drive mechanism installed on the frame (1). The station drive mechanism drives the two lower molds (7) to move between different stations.

2. The automotive casting coated sand core shooting machine according to claim 1, characterized in that, The flipping mechanism includes a rotating shaft (12) located above the connecting frame (6) and a mold support plate (13). The mold support plate (13) is fixedly connected to the rotating shaft (12). One end of the rotating shaft (12) is mounted on the connecting frame (6) through a bearing seat, and the other end is connected to an electric turntable (14) between the machine frame (1). The mold support plates (13) of the two flipping mechanisms are opposite to each other, and the two rotating shafts (12) are located on the outside of the two support plates.

3. The automotive casting coated sand core shooting machine according to claim 1, characterized in that, The mold driving mechanism includes a mold driving cylinder (15). A guide rod (16) is installed on both sides of the upper mold plate (8). The guide rod (16) passes through the upper base plate (4) and slides vertically with the upper base plate (4). A guide rod connecting plate (17) is fixedly connected between the upper parts of the two guide rods (16). A base plate bracket (18) is fixedly installed on the upper part of the upper base plate (4). The mold driving cylinder (15) is installed on the base plate bracket (18). The cylinder rod of the mold driving cylinder (15) is fixedly connected to the guide rod connecting plate (17).

4. The automotive casting coated sand core shooting machine according to claim 2, characterized in that, The driving mechanism of the sand-shooting cylinder (10) includes a sand-shooting cylinder (19) mounted on the base plate bracket (18). A sand-shooting cylinder (10) connecting plate is provided on one side of the sand-shooting cylinder (10). The cylinder rod of the sand-shooting cylinder (19) is fixedly connected to the sand-shooting cylinder (10) connecting plate. The sand-shooting cylinder (10) is located between two guide rods (16) and below the guide rod connecting plate (17).

5. The automotive casting coated sand core shooting machine according to any one of claims 1-3, characterized in that, The connecting tube is covered with an adsorption cover (27), which is open downwards. The lower end of the adsorption cover (27) is higher than the lower end of the connecting tube. The connecting tube passes upwards through the adsorption cover (27). The upper part of the adsorption cover (27) is sealed at the connection with the connecting tube. A negative pressure adsorption system is connected to one side of the adsorption cover (27).

6. The automotive casting coated sand core shooting machine according to claim 1, characterized in that, The lower part of the mold support plate (13) is provided on an electromagnet (20) mounted on a connecting frame (6).

7. The automotive casting coated sand core shooting machine according to claim 1, characterized in that, The station drive mechanism adopts a synchronous belt module (22), and the connecting frame (6) is located above the synchronous belt module (22) and is fixedly connected to the slider of the synchronous belt module (22). The synchronous belt module (22) is installed on the frame (1).

8. The automotive casting coated sand core shooting machine according to claim 6, characterized in that, The lower base plate (3) is located above the synchronous belt module (22). The lower base plate (3) is provided with a through groove (301), which divides the lower base plate (3) into two symmetrical parts. Two transverse guide rails (5) are located on both sides of the through groove (301).

9. The automotive casting coated sand core shooting machine according to claim 7, characterized in that, The lower part of the bottom plate (3) is provided with a positioning plate (23), and the positioning plate (23) has at least two positioning pins (24). The number of positioning pins (24) is even. The positioning pins (24) are symmetrically arranged on both sides of the through groove (301). The bottom plate (3) is provided with positioning holes of the same number as the positioning pins (24). The positioning pins (24) pass through the corresponding positioning holes. The bottom of the positioning plate (23) is connected to a positioning drive cylinder (26). The bottom of the mold support plate (13) is equipped with positioning sleeves (25) that cooperate with the positioning pins (24). The end of the positioning pin (24) is a tapered structure.

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