Sand paving machine for automobile mold casting

Abstract

The invention relates to the field of mold casting, and discloses a sand paving machine for automobile mold casting, which comprises a bottom plate, side plates symmetrically mounted on the bottom plate, a material box slidably connected between the two side plates, a discharging pipe communicated with the bottom of the material box, a driving assembly, a rack plate mounted on the side plates and driving the material box to move, and a sand paving plate mounted on the rack plate, the two side plates are symmetrically installed on the material box, the fixing assembly is installed on the bottom plate and located between the two side plates, and the sand box is placed on the fixing assembly. The device has the following advantages and effects that the rotating assembly further drives the lifting assembly to rotate when rotating, the lifting assembly rotates to periodically drive the clamping plate to move upwards, so that the sand box is driven to vibrate up and down at high frequency, jolt ramming operation is synchronously achieved in the sand uniform scattering process, internal pores of a sand layer are continuously extruded and filled, and the sand scattering efficiency is improved. And finally, a sand mold foundation with uniform compactness and a stable structure is formed, so that the sand mold forming precision is improved, and the casting process requirements of high-precision automobile parts are met.

Description

Technical Field

[0001] This invention relates to the field of mold casting technology, and in particular to a sand spreading machine for automobile mold casting. Background Technology

[0002] In the automotive manufacturing industry, mold casting is a key process for producing core components such as engine blocks and chassis brackets, which directly determines the dimensional accuracy, mechanical properties and service life of the parts. Among them, sand casting has long occupied the mainstream technical path of automotive mold casting due to its significant advantages such as inexpensive and readily available molding materials, simple mold manufacturing and suitability for single-piece to mass production, and is an indispensable basic process solution in the industry.

[0003] One of the core steps in sand casting is to prepare a dense and uniform sand mold in the sand box. The uniformity and compactness of the sand layer are directly related to the forming quality of the mold cavity. Existing sand-laying devices for automotive mold casting generally adopt a separate process of "laying sand first and then compacting", and the core compaction method is mainly mechanical compaction. This mode has insurmountable technical shortcomings when facing the complex structure of automotive molds: automotive molds (such as engine block and chassis bracket molds) usually contain many deep cavities, dead corners and complex curved surfaces. During the compaction process, the pressure is easy to decrease along the surface of the sand layer and is difficult to transmit to the deep layers and corner areas, resulting in "virtual sand" in these parts. The internal compaction of the sand layer varies significantly, which reduces the forming accuracy of the sand mold and cannot meet the casting process requirements of high-precision automotive parts. Therefore, we propose a sand-laying machine for automotive mold casting. Summary of the Invention

[0004] The purpose of this invention is to provide a sand-laying machine for automotive mold casting, which improves the sand mold forming accuracy to meet the requirements of high-precision automotive parts casting processes.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a sand spreading machine for automobile mold casting, comprising a base plate, side plates symmetrically mounted on the base plate, a material box slidably connected between the two side plates, and a discharge pipe communicating with the bottom of the material box.

[0006] A drive assembly is mounted on the side plate and drives the hopper to move.

[0007] The rack plates are symmetrically installed on the hopper.

[0008] A fixing component is mounted on the base plate and located between the two side plates.

[0009] The sand box is placed on the fixed assembly.

[0010] The positioning plates are symmetrically installed on the sand box and one end is clamped to the fixing component.

[0011] A rotating assembly is rotatably connected to the base plate and meshes with the rack plate. The rotating assemblies are symmetrically distributed on both sides of the sand box.

[0012] The lifting assembly is mounted on the rotating assembly and periodically lifts the positioning plate upwards.

[0013] An eccentric wheel is mounted on a rotating component on one side and periodically presses against a fixed component.

[0014] By adopting the above technical solution, when sand is laid into the sand box, the sand in the material box flows into the sand box through the discharge pipe, the drive component is started, and the material box moves horizontally above the sand box, so that the sand is initially spread in the sand box, covering the entire area of ​​the sand box and avoiding local accumulation. When the material box moves, it drives the rack plate to move. When the rack plate moves, it meshes with the rotating component, causing the rotating component to rotate. When the rotating component rotates, it drives the eccentric wheel to rotate. When the eccentric wheel rotates, it intermittently squeezes the fixed component, causing the sand box placed on the fixed component to move back and forth, realizing secondary uniform distribution of the sand in the sand box, filling the corner gaps, and solving the problem of uneven thickness caused by traditional single-path sand laying. The back and forth movement of the sand box can make the sand fully fill the dead corners and deep cavity areas of the cavity, avoiding "empty sand" and "vacuum", which is especially suitable for the sand laying needs of complex cavities such as automotive molds.

[0015] By adopting the above technical solution, the rotating component also drives the lifting component to rotate when it rotates. The rotation of the lifting component periodically drives the positioning plate to move up and down, thereby driving the sand box to vibrate at high frequency. During the uniform dispersion of sand, the compaction operation is realized simultaneously, so that the pores inside the sand layer are continuously squeezed and filled, and finally a sand mold foundation with uniform compaction and stable structure is formed. This is conducive to improving the sand mold forming accuracy and meeting the requirements of high-precision automotive parts casting process.

[0016] By adopting the above technical solution, the entire technical solution constructs a multi-action linkage mechanism with a single power source through the drive component, realizing the integrated operation of "initial sand laying, secondary uniform dispersion and synchronous vibration compaction", without the need to set up an additional independent drive mechanism, which simplifies the equipment structure and improves the sand laying efficiency and sand quality.

[0017] A further configuration of the present invention is as follows: the drive assembly includes a support plate symmetrically mounted on a single side plate, a threaded rod rotatably connected between two support plates, a synchronizing element that drives the two threaded rods, a slider threadedly connected to the outside of the threaded rod and slidably connected to the side plate, and a drive motor mounted on one of the support plates.

[0018] A further configuration of the present invention is that the output shaft of the drive motor is connected to a threaded rod at a corresponding position via a coupling, and the material box is installed between the two sliders.

[0019] A further embodiment of the present invention is that the synchronizing element includes synchronizing pulleys mounted on two threaded rods and a synchronizing belt that drives the two synchronizing pulleys.

[0020] By adopting the above technical solution, the drive motor starts and drives the corresponding threaded rod to rotate clockwise or counterclockwise. When one of the threaded rods rotates, the synchronous pulley and synchronous belt make the two threaded rods rotate clockwise or counterclockwise synchronously, thereby driving the slider to slide horizontally on the side plate, thereby driving the material box to move horizontally above the sand box, so that the sand is initially spread in the sand box, covering the entire area of ​​the sand box and avoiding local accumulation.

[0021] A further embodiment of the present invention is that the fixing component includes a fixing plate that slides horizontally on the base, baffles symmetrically mounted on the fixing plate, a vertical plate mounted on the base, and a spring connecting the vertical plate and the fixing plate.

[0022] A further feature of the present invention is that two springs are provided on the fixed platform, and the eccentric wheel intermittently presses the fixed platform, with the positions of the eccentric wheel and the spring corresponding one-to-one.

[0023] By adopting the above technical solution, the material box moves, driving the rack plate to move. When the rack plate moves, it meshes with the rotating component, causing the rotating component to rotate. When the rotating component rotates, it drives the eccentric wheel to rotate. When the eccentric wheel rotates, it intermittently squeezes the fixed platform, causing the spring connecting the fixed platform and the vertical plate to compress or reset. This causes the sand box placed on the fixed platform to move back and forth, achieving secondary uniform distribution of the sand falling into the sand box, filling corner gaps, and solving the problem of uneven thickness caused by traditional single-path sand laying. The back and forth movement of the sand box allows the sand to fully fill the dead corners and deep cavity areas of the cavity, avoiding "empty sand" and "vacuum," which is especially suitable for the sand laying needs of complex cavities such as automotive molds.

[0024] A further feature of the present invention is that the baffle is symmetrically provided with vertical grooves, and when the sand box is placed, the positioning plate passes through the vertical grooves from top to bottom and fits against the bottom wall of the vertical groove.

[0025] A further configuration of the present invention is as follows: the rotating assembly includes a main shaft rotatably connected to the base plate, a rotating gear mounted outside the main shaft, and a top plate mounted on the side plate. The other end of the main shaft is rotatably connected to the top plate. The rotating gear meshes with a rack plate. Two main shafts are arranged side by side on one side. The length of the rack plate is greater than the distance between the rotating gears on the two main shafts.

[0026] A further configuration of the present invention is as follows: the lifting assembly includes a rotating disk mounted on the main shaft, a lifting block mounted on the rotating disk, and lifting surfaces symmetrically arranged on both sides of the lifting block. The lifting surfaces are inclined surfaces, and the lowest point of the inclined surfaces is at the same height as the inner bottom wall of the vertical groove.

[0027] By adopting the above technical solution, the material box moves, driving the rack plate to move. When the rack plate moves, it meshes with the rotating gear, thereby driving the rotating disk on the main shaft to rotate. This causes the lifting block on the rotating disk to rotate, and the lifting surface intermittently lifts the positioning plate in the vertical groove. Then, it falls down under the action of gravity, causing the sand box to vibrate up and down at high frequency. During the uniform dispersion of sand, the compaction operation is achieved simultaneously, so that the pores inside the sand layer are continuously squeezed and filled, ultimately forming a sand mold foundation with uniform compaction and stable structure. This is beneficial to improving the sand mold forming accuracy and meeting the high-precision automotive parts casting process requirements. Lifting surfaces are provided on both sides, so that when the rack plate moves back and forth, driving the main shaft to rotate clockwise or counterclockwise, the lifting block can lift the positioning plate in the vertical groove, realizing the up and down high-frequency vibration of the sand box.

[0028] A further feature of the present invention is that a lifting ring is installed on the card plate, a wear-resistant pad is installed on the fixed platform, and a track for sliding the fixed platform is installed on the base.

[0029] By adopting the above technical solutions, the lifting ring makes it easy for workers to lift the positioning plate from the vertical groove and separate the sand box from the fixed platform. The wear-resistant pad can reduce the impact of the high-frequency vibration of the sand box on the fixed platform, and the track provides a stable movement path for the fixed platform.

[0030] The beneficial effects of this invention are:

[0031] 1. When spreading sand into the sand box, the sand in the material box flows into the sand box through the discharge pipe. The drive component is started, which moves the material box horizontally above the sand box, so that the sand is initially spread in the sand box, covering the entire area of ​​the sand box and avoiding local accumulation.

[0032] 2. When the material box moves, it drives the rack plate to move. When the rack plate moves, it meshes with the rotating component, causing the rotating component to rotate. When the rotating component rotates, it drives the eccentric wheel to rotate. When the eccentric wheel rotates, it intermittently squeezes the fixed component, causing the sand box placed on the fixed component to move back and forth. This achieves secondary uniform distribution of the sand in the sand box, filling the corner gaps and solving the problem of uneven thickness caused by traditional single-path sand laying. The back and forth movement of the sand box allows the sand to fully fill the dead corners and deep cavity areas of the cavity, avoiding "empty sand" and "voids". It is especially suitable for the sand laying requirements of complex cavities such as automotive molds.

[0033] 3. When the rotating component rotates, it also drives the lifting component to rotate. The rotation of the lifting component periodically drives the positioning plate to move up and down, thereby causing the sand box to vibrate at high frequency. During the uniform dispersion of sand, the compaction operation is realized simultaneously, so that the pores inside the sand layer are continuously squeezed and filled, and finally a sand mold base with uniform compaction and stable structure is formed. This is conducive to improving the sand mold forming accuracy and meeting the requirements of high-precision automotive parts casting process.

[0034] 4. The entire technical solution constructs a multi-action linkage mechanism with a single power source through drive components, realizing the integrated operation of "initial sand laying, secondary uniform dispersion and synchronous vibration compaction". There is no need to set up an additional independent drive mechanism, which simplifies the equipment structure and improves the sand laying efficiency and sand quality. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of the present invention;

[0037] Figure 2 This is a top view of the structure of the present invention;

[0038] Figure 3 This is the present invention. Figure 2 Schematic diagram of the cross-sectional structure at the middle EE section;

[0039] Figure 4 This is a schematic diagram of the connection structure between the rotating component and the lifting component of the present invention;

[0040] Figure 5 This is a side view of the structure of the present invention;

[0041] Figure 6 This is the present invention. Figure 5 Schematic diagram of the cross-sectional structure at point AA.

[0042] In the diagram, 1. Base plate; 2. Side plate; 3. Material box; 4. Discharge pipe; 5. Drive assembly; 51. Support plate; 52. Threaded rod; 53. Synchronizing component; 53a. Synchronizing pulley; 53b. Synchronizing belt; 54. Slider; 55. Drive motor; 6. Rack plate; 7. Fixing assembly; 71. Fixing platform; 72. Baffle; 73. Spring; 74. Vertical plate; 8. Sand box; 9. Positioning plate; 10. Rotating assembly; 101. Main shaft; 102. Rotating gear; 103. Top plate; 11. Lifting assembly; 111. Rotating disk; 112. Lifting block; 113. Lifting surface; 12. Eccentric wheel; 13. Vertical groove; 14. Track. Detailed Implementation

[0043] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0044] Please see Figure 1-6 In some embodiments of the present invention, a sand spreading machine for automobile mold casting is provided, including a base plate 1, side plates 2 symmetrically installed on the base plate 1, a material box 3 slidably connected between the two side plates 2, and a discharge pipe 4 communicating with the bottom of the material box 3. The discharge pipe 4 is provided with a control valve to control the discharge of sand.

[0045] The drive assembly 5 is mounted on the side plate 2 and drives the material box 3 to move.

[0046] The rack plate 6 is symmetrically installed on the material box 3.

[0047] The fixing component 7 is installed on the base plate 1 and located between the two side plates 2.

[0048] The sand box 8 is placed on the fixing component 7.

[0049] The positioning plate 9 is symmetrically installed on the sand box 8 and one end is fixed to the fixing component 7.

[0050] Rotating assembly 10 is rotatably connected to the base plate 1 and meshes with the rack plate 6. Rotating assembly 10 is symmetrically distributed on both sides of the sand box 8.

[0051] The lifting component 11 is installed on the rotating component 10 and periodically lifts the positioning plate 9 upward.

[0052] An eccentric wheel 12 is mounted on a rotating assembly 10 on one side and periodically presses against a fixed assembly 7.

[0053] In the embodiments of this application, when sand is laid in the sand box 8, the sand in the material box 3 flows into the sand box 8 through the discharge pipe 4. The drive component 5 is started, which drives the material box 3 to move horizontally above the sand box 8, so that the sand is initially spread in the sand box 8, covering the entire area of ​​the sand box 8 and avoiding local accumulation. When the material box 3 moves, it drives the rack plate 6 to move. When the rack plate 6 moves, it meshes with the rotating component 10 and drives the rotating component 10 to rotate. When the rotating component 10 rotates, it drives the eccentric wheel 12 to rotate. When the eccentric wheel 12 rotates, it intermittently squeezes the fixing component 7, so that the sand box 8 placed on the fixing component 7 moves back and forth, and the sand falling into the sand box 8 is evenly distributed in a secondary way, filling the corner gaps and solving the problem of uneven thickness caused by traditional single-path sand laying. The back and forth movement of the sand box 8 can make the sand fully fill the dead corners and deep cavity areas of the cavity, avoiding "empty sand" and "voids", which is especially suitable for the sand laying needs of complex cavities such as automotive molds.

[0054] When the rotating component 10 rotates, it also drives the lifting component 11 to rotate. The rotation of the lifting component 11 periodically drives the positioning plate 9 to move upward, thereby driving the sand box 8 to vibrate up and down at high frequency. During the uniform dispersion of sand, the compaction operation is realized simultaneously, so that the pores inside the sand layer are continuously squeezed and filled, and finally a sand mold base with uniform compaction and stable structure is formed. This is conducive to improving the sand mold forming accuracy and meeting the requirements of high-precision automotive parts casting process.

[0055] The entire technical solution constructs a multi-action linkage mechanism with a single power source through drive component 5, realizing the integrated operation of "initial sand laying, secondary uniform dispersion and synchronous vibration compaction". There is no need to set up an additional independent drive mechanism, which simplifies the equipment structure and improves the sand laying efficiency and sand quality.

[0056] In some embodiments, the drive assembly 5 includes a support plate 51 symmetrically mounted on a single side plate 2, a threaded rod 52 rotatably connected between two support plates 51, a synchronizing element 53 drivingly connecting the two threaded rods 52, a slider 54 threadedly connected to the outside of the threaded rod 52 and slidably connected to the side plate 2, and a drive motor 55 mounted on one of the support plates 51. The output shaft of the drive motor 55 is connected to the threaded rod 52 at the corresponding position via a coupling. The material box 3 is installed between the two sliders 54. The synchronizing element 53 includes a synchronizing wheel 53a mounted on the two threaded rods 52 and a synchronizing belt 53b drivingly connecting the two synchronizing wheels 53a. When the drive motor 55 starts, it drives the threaded rod 52 at the corresponding position to rotate clockwise or counterclockwise. When one of the threaded rods 52 rotates, the synchronizing wheel 53a and the synchronizing belt 53b cause the two threaded rods 52 to rotate clockwise or counterclockwise synchronously, thereby driving the slider 54 to slide horizontally on the side plate 2, thereby driving the material box 3 to move horizontally above the sand box 8, so that the sand is initially spread in the sand box 8, covering the entire area of ​​the sand box 8 and avoiding local accumulation.

[0057] In some embodiments, the fixing assembly 7 includes a fixing plate 71 that slides horizontally on the base 1, baffles 72 symmetrically mounted on the fixing plate 71, a vertical plate 74 mounted on the base 1, and springs 73 connecting the vertical plate 74 and the fixing plate 71. Two springs 73 are provided on the fixing plate 71. An eccentric wheel 12 intermittently presses the fixing plate 71. The positions of the eccentric wheel 12 and the springs 73 correspond one-to-one. When the material box 3 moves, it drives the rack plate 6 to move. When the rack plate 6 moves, it meshes with the rotating assembly 10, causing the rotating assembly 10 to rotate. When component 10 rotates, it drives the eccentric wheel 12 to rotate. When the eccentric wheel 12 rotates, it intermittently squeezes the fixed platform 71, causing the spring 73 connecting the fixed platform 71 and the vertical plate 73 to be compressed or reset. This causes the sand box 8 placed on the fixed platform 71 to move back and forth, so that the sand falling into the sand box 8 can be evenly distributed in the secondary way, filling the corner gaps and solving the problem of uneven thickness caused by traditional single-path sand laying. The back and forth movement of the sand box 8 can allow the sand to be fully filled in the dead corners and deep cavity areas of the cavity, avoiding "empty sand" and "vacuum". It is especially suitable for the sand laying needs of complex cavities such as automotive molds.

[0058] In some embodiments, vertical grooves 13 are symmetrically provided on the baffle 72. When the sand box 8 is placed, the positioning plate 9 passes through the vertical grooves 13 from top to bottom and fits against the inner bottom wall of the vertical grooves 13. The rotating assembly 10 includes a main shaft 101 rotatably connected to the base plate 1, a rotating gear 102 installed outside the main shaft 101, and a top plate 103 installed on the side plate 2. The other end of the main shaft 101 is rotatably connected to the top plate 103. The rotating gear 102 meshes with the rack plate 6. Two main shafts 101 are arranged side by side on one side. The length of the rack plate 6 is greater than the distance between the rotating gears 102 on the two main shafts 101. The lifting assembly 11 includes a rotating disk 111 installed on the main shaft 101, a lifting block 112 installed on the rotating disk 111, and lifting surfaces 113 symmetrically arranged on both sides of the lifting block 112. The lifting surface 113 is an inclined surface, and the lowest point of the inclined surface is at the same height as the inner bottom wall of the vertical groove 13.

[0059] When the material box 3 moves, it drives the rack plate 6 to move. When the rack plate 6 moves, it meshes with the rotating gear 102, thereby driving the rotating disk 111 on the main shaft 101 to rotate. This causes the lifting block 112 on the rotating disk 111 to rotate. The lifting surface 113 intermittently lifts the positioning plate 9 in the vertical groove 13, and then it falls down under the action of gravity, causing the sand box 8 to vibrate up and down at high frequency. During the uniform dispersion of sand, the compaction operation is realized simultaneously, so that the pores inside the sand layer are continuously squeezed and filled, and finally a sand mold base with uniform compactness and stable structure is formed. This is beneficial to improving the sand mold forming accuracy and meeting the requirements of high-precision automotive parts casting process. Lifting surfaces 113 are provided on both sides, so that when the rack plate 6 moves back and forth and drives the main shaft 101 to rotate clockwise or counterclockwise, the lifting block 112 can lift the positioning plate 9 in the vertical groove 13, realizing the up and down high frequency vibration of the sand box 8.

[0060] In some embodiments, a lifting ring (not shown in the figure) is also installed on the positioning plate 9, a wear-resistant pad is installed on the fixed platform 71, and a track 14 for sliding the fixed platform 71 is installed on the base 1. The lifting ring facilitates the operator to lift the positioning plate 9 from the vertical groove 13 and separate the sand box 8 from the fixed platform 71. The wear-resistant pad can reduce the impact of the high-frequency vibration of the sand box 8 on the fixed platform 71. The track 14 provides a stable movement path for the fixed platform 71.

[0061] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

Claims

1. A sand-laying machine for automobile mold casting, characterized in that, It includes a base plate (1), side plates (2) symmetrically installed on the base plate (1), a material box (3) slidably connected between the two side plates (2), and a discharge pipe (4) connected to the bottom of the material box (3); A drive assembly (5) is mounted on the side plate (2) and drives the hopper (3) to move; A toothed rack (6) is symmetrically installed on the material box (3); The fixing component (7) is installed on the base plate (1) and located between the two side plates (2); The sand box (8) is placed on the fixing component (7); The positioning plate (9) is symmetrically installed on the sand box (8) and one end is clamped on the fixing component (7); Rotating assembly (10) is rotatably connected to the base plate (1) and meshes with the rack plate (6). The rotating assembly (10) is symmetrically distributed on both sides of the sand box (8). The lifting assembly (11) is mounted on the rotating assembly (10) and periodically lifts the mounting plate (9) upward. An eccentric wheel (12) is mounted on a rotating assembly (10) on one side and periodically presses against a fixed assembly (7).

2. The sand-laying machine for automobile mold casting according to claim 1, characterized in that: The drive assembly (5) includes a support plate (51) symmetrically mounted on a single side plate (2), a threaded rod (52) rotatably connected between the two support plates (51), a synchronizing element (53) that drives the two threaded rods (52), a slider (54) threaded to the outside of the threaded rod (52) and slidably connected to the side plate (2), and a drive motor (55) mounted on one of the support plates (51).

3. The sand-laying machine for automobile mold casting according to claim 2, characterized in that: The output shaft of the drive motor (55) is connected to the threaded rod (52) at the corresponding position via a coupling, and the hopper (3) is installed between the two sliders (54).

4. The sand-laying machine for automobile mold casting according to claim 3, characterized in that: The synchronizing element (53) includes a synchronizing pulley (53a) mounted on two threaded rods (52) and a synchronizing belt (53b) that drives the two synchronizing pulleys (53a).

5. A sand-laying machine for automobile mold casting according to claim 4, characterized in that: The fixing component (7) includes a fixing plate (71) that slides horizontally on the base (1), a baffle (72) that is symmetrically installed on the fixing plate (71), a vertical plate (73) installed on the base (1), and a spring (73) that connects the vertical plate (74) and the fixing plate (71).

6. The sand-laying machine for automobile mold casting according to claim 5, characterized in that: Two springs (73) are provided on the fixed platform (71), and the eccentric wheel (12) intermittently presses the fixed platform (71). The positions of the eccentric wheel (12) and the spring (73) correspond one-to-one.

7. A sand-laying machine for automobile mold casting according to claim 6, characterized in that: The baffle (2) has symmetrical vertical grooves (13). When the sand box (8) is placed, the positioning plate (9) passes through the vertical groove (13) from top to bottom and fits against the bottom wall of the vertical groove (13).

8. A sand-laying machine for automobile mold casting according to claim 7, characterized in that: The rotating assembly (10) includes a main shaft (101) rotatably connected to the base plate (1), a rotating gear (102) mounted on the outside of the main shaft (101), and a top plate (103) mounted on the side plate (2). The other end of the main shaft (101) is rotatably connected to the top plate (103). The rotating gear (102) meshes with the rack plate (6). Two main shafts (101) are arranged side by side on one side. The length of the rack plate (6) is greater than the distance between the rotating gears (102) on the two main shafts (101).

9. A sand-laying machine for automobile mold casting according to claim 8, characterized in that: The lifting assembly (11) includes a rotating disk (111) mounted on the main shaft (101), a lifting block (112) mounted on the rotating disk (111), and lifting surfaces (113) symmetrically arranged on both sides of the lifting block (112). The lifting surfaces (113) are inclined surfaces, and the lowest point of the inclined surface is at the same height as the inner bottom wall of the vertical groove (13).

10. A sand-laying machine for automobile mold casting according to claim 9, characterized in that: The card plate (9) is also equipped with a lifting ring, the fixed platform (71) is equipped with a wear-resistant pad, and the base (1) is equipped with a track (14) for sliding the fixed platform (71).

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