Casting sand mold molding machine

Abstract

The invention relates to the technical field of casting devices, in particular to a casting sand mold molding machine. A foundry sand mold molding machine comprises a hydraulic rod and an extrusion mechanism. The extrusion mechanism comprises a contact disc and a partition plate. The contact disc is spherically hinged to the hydraulic rod, and an extrusion block is arranged on the contact disc. The partition plate comprises a plurality of annular plates, a plurality of connecting plates are connected between every two adjacent annular plates, and the space between every two adjacent annular plates is divided into a plurality of limiting spaces. The partition plate firstly makes contact with molding sand in the molding sand tray, and the molding sand flows into the limiting space under the action of pressure. And the annular plate can limit the molding sand from flowing to the edge area of the contact disc, so that the non-uniform compactness of different positions of the sand mold is relieved. If the extrusion block meets the condition that the surface of molding sand is uneven, the contact disc can rotate, and damage to the hydraulic rod caused by rigid impact is reduced. The casting sand mold molding machine provided by the invention is used for solving the problems that when an existing molding machine is used for extruding molding sand, the compactness of the molding sand is not uniform, and a hydraulic rod is damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting device, in particular to a casting sand mold molding machine. BACKGROUND

[0002] The molding machine is a casting equipment for manufacturing sand mold, which can be classified into compaction type, jolt type, jolt squeeze type, shot squeeze type and sand throwing machine according to the compaction method. The equipment usually adopts a hollow frame machine body structure, and a pneumatic system is provided with an oil mist generator to realize lubrication. The jolt compaction mechanism generates inertial sand compaction by means of the impact of the workbench and the anvil, and the mold sample can be taken out (i.e. the mold is removed) through different mechanisms.

[0003] The high-pressure multi-contact molding machine drives the contact array by means of a hydraulic system, so as to realize uniform compaction of the sand mold. The gas impact molding machine uses instantaneous gas pressure to complete sand compaction, and has the advantage of low noise. The fully automatic molding machine production line can integrate various processes such as jolt compaction, compaction and shot compaction, not only realizes the automation of sand mold manufacturing, but also increases the production efficiency by 300% to 500%, and reduces the energy consumption by about 30%. The sand throwing machine synchronously completes the sand filling and compaction processes by means of rotating blades, and is especially suitable for flexible production requirements. The equipment daily maintenance needs to focus on checking the corrosion condition of the pressure head, the lubrication state and removing foreign matters.

[0004] The patent application with the publication number CN107745096A provides a casting sand mold compaction molding machine. The equipment moves the upper mold plate upward to compact the upper box sand mold, moves the lower mold plate downward to compact the lower box sand mold, and implements reverse extrusion at the parting surface, so as to obtain a casting sand mold with lower top compactness and higher parting surface compactness, which helps to improve the casting quality. In addition, the upper and lower sand molds are synchronously extruded and compacted, the structure is balanced in stress, and the operation is stable and reliable. However, in the process of extruding the sand mold by the upper and lower mold plates, due to the difference in flowability of the sand mold in the middle and edge regions of the mold plate - the flowability of the edge part is usually better, the pressure applied by the center part of the contact is greater than that of the edge part, and then the sand compactness in the compaction range of the same contact is not uniform. In addition, when the upper and lower mold plates encounter uneven surfaces of the mold cavity, the pressure distribution of each part of the mold plate is uneven, which not only aggravates the inconsistency of the sand compactness and reduces the uniformity of the sand mold, but also may cause the contact to bear the eccentric load. After the eccentric load is transmitted to the rear hydraulic rod, the local stress concentration of the rod is easy to cause serious damage. SUMMARY

[0005] The present application provides a casting sand mold molding machine to solve the problem of uneven sand compactness and damage to the hydraulic rod when the existing molding machine extrudes the sand.

[0006] The application discloses a foundry sand mold molding machine which adopts the following technical scheme: a foundry sand mold molding machine comprises a rack, a hydraulic rod and an extrusion mechanism.

[0007] The extrusion mechanism comprises a contact disc and a partition plate. The upper side of the contact disc is hingedly connected with the lower end of the hydraulic rod. The lower side of the contact disc is provided with a plurality of extrusion blocks. The partition plate is slidably arranged on the lower side of the contact disc. The partition plate comprises a plurality of ring plates which are coaxial with the contact disc and sequentially arranged from inside to outside. A plurality of connecting plates are fixedly connected between two adjacent ring plates, and the connecting plates are arranged at intervals along the circumference of the contact disc and divide the space between the two adjacent ring plates into a plurality of limiting spaces. Each extrusion block is arranged in a corresponding limiting space.

[0008] The extrusion mechanism has a first state and a second state. In the first state, the extrusion blocks are located outside the limiting spaces and on the upper side of the partition plate. In the second state, the extrusion blocks are located in the limiting spaces, and the lower side of the extrusion block is coplanar with the lower side of the ring plate. When the extrusion mechanism is in the first state, the hydraulic rod drives the contact disc and the partition plate to move downward synchronously. The partition plate first contacts the sand and forms a preliminary limit. Then the extrusion blocks move downward relative to the partition plate and extrude the sand until the lower side of the extrusion block is coplanar with the lower side of the ring plate, and the extrusion mechanism is converted into the second state.

[0009] Further, the foundry sand mold molding machine further comprises an adjusting mechanism which comprises a plurality of adjusting assemblies arranged at intervals along the circumference of the contact disc. Each adjusting assembly comprises a scraper and an adjusting unit. The scraper is slidably arranged on the contact disc along the radial direction of the contact disc. The scraper is obliquely arranged. When the contact disc rotates, the scraper in the adjusting assembly on the obliquely downward side of the contact disc gradually moves away from the contact disc under the action of the adjusting unit.

[0010] Further, a connecting ring is fixedly arranged on the hydraulic rod, and the connecting ring is coaxial with the hydraulic rod. Each adjusting unit comprises a connecting shaft, a gear and a soft rope. The connecting shaft is rotatably arranged on the contact disc, and the axis of the connecting shaft is arranged along the tangential direction of the contact disc. The gear is arranged on the connecting shaft. The upper side of each scraper is fixedly provided with a rack which is arranged along the radial direction of the contact disc. Each gear is engaged with the rack. The upper end of the soft rope is fixedly connected with the connecting ring, and the lower end of the soft rope is fixedly arranged on the gear and wound thereon. When the contact disc rotates, the soft rope in the adjusting assembly on the obliquely downward side of the contact disc is pulled tight and drives the corresponding gear to rotate.

[0011] Further, the scraper and the gear are connected through a volute spring which is used for resetting the gear.

[0012] Furthermore, a casting sand molding machine also includes multiple tension springs, which are distributed sequentially along the circumference of the contact plate. Each tension spring is connected at both ends to a connecting ring and the upper side of the contact plate, so that the contact plate remains coaxial with the hydraulic rod when it is not in contact with the molding sand.

[0013] Furthermore, the lower side of the partition plate is curved, with the middle of the partition plate higher than its edge. The lower sides of multiple extrusion blocks together form a curved surface parallel to the lower side of the partition plate, thus restricting the flow of molding sand at the edge of the partition plate.

[0014] Furthermore, a limit rod is fixedly installed on the contact plate, the limit rod is vertically positioned, and a first stop is fixedly installed at the lower end of the limit rod. A limit groove is opened on the partition plate, and a second stop is fixedly installed in the limit groove, with the lower end of the limit rod slidably positioned in the limit groove. When the extrusion mechanism is in the first state, the first stop and the second stop abut against each other to prevent the limit rod from disengaging from the limit groove.

[0015] Furthermore, the extrusion mechanism also includes a first spring, which connects the contact plate and the partition plate, and provides an initial preload force for the partition plate to extrude molding sand.

[0016] Furthermore, a casting sand molding machine also includes a molding sand tray, which is set on the machine frame and located below the partition plate for holding molding sand.

[0017] Furthermore, a casting sand mold molding machine also includes a vibrator, which is mounted on a frame and connected to a molding sand disc for vibrating the molding sand disc.

[0018] The beneficial effects of this invention are as follows: The casting sand mold molding machine of this invention, through a set extrusion mechanism, is initially in a first state. A driving hydraulic rod drives the contact plate and its partition plates to move downwards synchronously. The partition plates first contact the molding sand in the molding sand tray and pre-compress it. Under pressure, the molding sand flows into the limiting space formed by the ring plates. These ring plates effectively restrict the disorderly flow of molding sand towards the edge area of ​​the contact plate, thereby alleviating the uneven density at different locations of the sand mold.

[0019] When the molding sand density reaches the preset value and the partition plate can no longer be pressed down, the contact plate continues to move downwards, thus creating displacement relative to the partition plate. During this process, the extrusion block gradually extends into the limiting space, performing secondary compaction on the molding sand within. When the lower side of the extrusion block is coplanar with the lower side of the ring plate, the extrusion mechanism enters its second state. Subsequently, the partition plate and the extrusion block move downwards synchronously for final compaction, effectively reducing local density differences caused by excessively high unit pressure on the partition plate.

[0020] If the extrusion block encounters an uneven surface of molding sand, the contact plate can adaptively rotate around the ball joint at the lower end of the hydraulic rod, raising one side and lowering the other to conform to the uneven surface. This ensures that even the lower recesses are fully compacted, while reducing damage to the hydraulic rod from rigid impacts. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0022] Figure 1 This is a schematic diagram of the structure of a casting sand molding machine provided in an embodiment of the present invention; Figure 2 This is a schematic diagram from another perspective of a casting sand mold molding machine provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the hydraulic rod and extrusion mechanism of a casting sand molding machine provided in an embodiment of the present invention; Figure 4 This is a schematic diagram from another perspective of the hydraulic rod and extrusion mechanism of a casting sand molding machine provided in an embodiment of the present invention; Figure 5 A cross-sectional view of the hydraulic rod and extrusion mechanism of a casting sand molding machine provided in an embodiment of the present invention; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a partial structural diagram of the extrusion mechanism of a casting sand molding machine provided in an embodiment of the present invention.

[0023] In the diagram: 101, frame; 102, vibratory machine; 103, molding sand tray; 104, hydraulic rod; 200, contact plate; 201, extrusion block; 202, connecting ring; 203, tension spring; 204, soft rope; 205, gear; 2051, connecting shaft; 2052, spiral spring; 206, scraper; 2061, rack; 207, partition plate; 2071, limit rod; 2072, first spring. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0025] Reference Figures 1 to 7 As shown in the figure, an embodiment of the present invention provides a casting sand molding machine, including a frame 101, a hydraulic rod 104, and an extrusion mechanism. The hydraulic rod 104 is vertically arranged, and its upper end is fixedly connected to the frame 101. The extrusion mechanism includes a contact plate 200 and a partition plate 207. The upper side of the contact plate 200 is ball-jointed to the lower end of the hydraulic rod 104. A plurality of extrusion blocks 201 are fixedly arranged on the lower side of the contact plate 200.

[0026] The partition plate 207 is slidably disposed on the lower side of the contact disk 200. The partition plate 207 includes multiple ring plates, which are coaxial with the contact disk 200 and are distributed sequentially from the inside to the outside. Multiple connecting plates are fixedly connected between two adjacent ring plates, and the multiple connecting plates are spaced apart along the circumference of the contact disk 200, dividing the space between two adjacent ring plates into multiple limiting spaces. Each pressing block 201 is slidably disposed within a corresponding limiting space.

[0027] The extrusion mechanism has a first state and a second state. In the first state, the extrusion block 201 is located outside the limiting space and above the partition plate 207. In the second state, the extrusion block 201 is located inside the limiting space, and the lower side surface of the extrusion block 201 is coplanar with the lower side surface of the ring plate.

[0028] When the extrusion mechanism is in the first state, the hydraulic rod 104 drives the contact plate 200 and the partition plate 207 to move downward synchronously. The partition plate 207 first contacts the molding sand and forms a preliminary limit. Then the extrusion block 201 moves downward relative to the partition plate 207 and extrudes the molding sand until the lower side of the extrusion block 201 is coplanar with the lower side of the ring plate. The extrusion mechanism then switches to the second state.

[0029] Initially, the extrusion mechanism is in its first state. The hydraulic rod 104 is driven, causing the contact plate 200 and its partition plates 207 to move downwards synchronously. The partition plates 207 first contact the molding sand within the molding sand tray 103 and pre-compress it. Under pressure, the molding sand flows into the confined space formed by the ring plates. These ring plates effectively restrict the disordered flow of molding sand towards the edge area of ​​the contact plate 200, thereby alleviating uneven compaction at different locations in the sand mold.

[0030] When the molding sand density reaches the preset value and the partition plate 207 can no longer press down, the contact plate 200 continues to move downwards, thus displacing relative to the partition plate 207. During this process, the extrusion block 201 gradually extends into the limiting space, performing secondary compaction on the molding sand within. When the lower side of the extrusion block 201 is coplanar with the lower side of the ring plate, the extrusion mechanism is in its second state. Subsequently, the partition plate 207 and the extrusion block 201 move downwards synchronously for final compaction. This effectively reduces local density differences caused by excessive unit pressure of the partition plate 207.

[0031] If the extrusion block 201 encounters an uneven surface of molding sand, the contact plate 200 can adaptively rotate around the ball joint at the lower end of the hydraulic rod 104, raising one side and lowering the other to conform to the uneven surface. This ensures that even the lower recesses can be fully compacted, while reducing damage to the hydraulic rod 104 caused by rigid impacts.

[0032] In this embodiment, the contact disk 200 is provided with a plurality of first sliding grooves, which are distributed sequentially along the circumference of the contact disk 200. The first sliding grooves are inclined and gradually move away from the axis of the contact disk 200 from top to bottom.

[0033] A casting sand molding machine also includes an adjustment mechanism comprising multiple adjustment components arranged sequentially along the circumference of a contact disk 200. Each adjustment component includes a scraper 206 and an adjustment unit, with each scraper 206 slidably disposed within a first groove. The scraper 206 is inclined, gradually moving away from the axis of the contact disk 200 from top to bottom. When the contact disk 200 rotates, the scraper 206 in the adjustment component on the downwardly inclined side of the contact disk 200, under the action of the adjustment unit, gradually moves away from the contact disk 200. The inclined scraper 206 can gather the surrounding molding sand towards the concave area, replenishing the concave area with molding sand and thus compensating for the density difference.

[0034] In this embodiment, a connecting ring 202 is fixedly mounted on the hydraulic rod 104, and the connecting ring 202 and the hydraulic rod 104 are coaxially arranged. Each adjustment unit includes a connecting shaft 2051, a gear 205, and a flexible rope 204. The connecting shaft 2051 is rotatably mounted on the contact disk 200, and the axis of the connecting shaft 2051 is arranged along the tangential direction of the contact disk 200. The gear 205 is mounted on the connecting shaft 2051. A rack 2061 is fixedly mounted on the upper side of each scraper 206, and the rack 2061 is arranged radially along the contact disk 200. Each gear 205 meshes with the rack 2061. The upper end of the flexible rope 204 is fixedly connected to the connecting ring 202, and the lower end of the flexible rope 204 is fixed to the gear 205 and wound around it. When the contact disk 200 rotates, the flexible rope 204 in the adjustment assembly on the downward tilting side of the contact disk 200 is tightened, driving the corresponding gear 205 to rotate in the forward direction.

[0035] In this embodiment, the scraper 206 and the gear 205 are connected by a spiral spring 2052, which is used to reset the gear 205. When the contact disc 200 is no longer in contact with the molding sand, the gear 205, which was originally rotating in the forward direction, rotates in the reverse direction and resets under the action of the spiral spring 2052, driving the scraper 206 back into the first groove.

[0036] In this embodiment, a casting sand molding machine further includes multiple tension springs 203, which are distributed sequentially along the circumference of the contact plate 200. The two ends of each tension spring 203 are respectively connected to the connecting ring 202 and the upper side of the contact plate 200, so that the contact plate 200 remains coaxial with the hydraulic rod 104 when it is not in contact with the molding sand.

[0037] In this embodiment, the lower side surface of the partition plate 207 is curved, and the middle part of the partition plate 207 is higher than the edge of the partition plate 207. The lower sides of the multiple extrusion blocks 201 together form a curved surface parallel to the lower side surface of the partition plate 207, further restricting the flow of molding sand at the edge of the partition plate 207.

[0038] In this embodiment, a limiting rod 2071 is fixedly installed on the contact plate 200. The limiting rod 2071 is vertically arranged, and a first stop is fixedly installed at the lower end of the limiting rod 2071. A limiting groove is formed on the partition plate 207, and a second stop is fixedly installed in the limiting groove. The lower end of the limiting rod 2071 is slidably installed in the limiting groove. When the pressing mechanism is in the first state, the first stop and the second stop abut against each other to prevent the limiting rod 2071 from disengaging from the limiting groove.

[0039] In this embodiment, the extrusion mechanism further includes a first spring 2072, which is sleeved on the limiting rod 2071. The first spring 2072 connects the contact plate 200 and the partition plate 207, and provides an initial preload force for the partition plate 207 to extrude molding sand.

[0040] In this embodiment, a casting sand molding machine further includes a molding sand tray 103, which is disposed on the frame 101 and located below the partition plate 207 for holding molding sand.

[0041] In this embodiment, a casting sand mold molding machine further includes a vibrator 102, which is mounted on a frame 101 and connected to a molding sand disc 103 for vibrating the molding sand disc 103.

[0042] Working process: In the initial state, the contact plate 200 is coaxial with the hydraulic rod 104, and the extrusion mechanism is in the first state, at which time the first stop block and the second stop block abut against each other.

[0043] During operation, the hydraulic rod 104 is driven, which in turn drives the contact plate 200 and its partition plate 207 to move downwards synchronously. The partition plate 207 first contacts and pre-compresses the molding sand in the molding sand tray 103. Under pressure, the molding sand flows into the confined space formed by the ring plates. These ring plates effectively restrict the disordered flow of molding sand to the edge area of ​​the contact plate 200, thereby alleviating the uneven density at different locations of the sand mold.

[0044] When the molding sand density reaches the preset value and the partition plate 207 can no longer press down, the contact plate 200 continues to move downwards, thus displacing relative to the partition plate 207. During this process, the extrusion block 201 gradually extends into the limiting space, performing secondary compaction on the molding sand within. When the lower side of the extrusion block 201 is coplanar with the lower side of the ring plate, the extrusion mechanism is in its second state. Subsequently, the partition plate 207 and the extrusion block 201 move downwards synchronously for final compaction. This effectively reduces local density differences caused by excessive unit pressure of the partition plate 207.

[0045] If the extrusion block 201 encounters an uneven surface of molding sand, the contact plate 200 can adaptively rotate around the ball joint at the lower end of the hydraulic rod 104, raising one side and lowering the other to conform to the uneven surface. This ensures that even the lower recesses can be fully compacted, while reducing damage to the hydraulic rod 104 caused by rigid impacts.

[0046] During this adaptive adjustment process, the flexible rope 204 in the adjustment assembly on the upward tilting side of the contact disc 200 is relaxed, while the flexible rope 204 on the downward tilting side is tensioned. The tensioned flexible rope 204 drives the corresponding gear 205 to rotate forward, which in turn causes the scraper 206 to extend radially outward through the rack 2061, at which time the spiral spring 2052 stores force. As the scraper 206 gradually extends from the first groove, the tilted scraper 206 can gather the surrounding molding sand into the concave area, replenishing the molding sand in that area and thus making up for the difference in density.

[0047] After the work is completed, the hydraulic rod 104 is driven, which in turn moves the contact plate 200 upward first, and then moves the partition plate 207 upward. Under the action of the tension spring 203, the contact plate 200 returns to its original position, coaxial with the hydraulic rod 104. The gear 205, after rotating in the forward direction, rotates in the reverse direction and returns to its original position under the action of the spiral spring 2052, driving the scraper 206 back into the first groove.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A casting sand mold molding machine, characterized in that: comprising a frame, a hydraulic rod and an extrusion mechanism; the hydraulic rod is vertically arranged, and the upper end of the hydraulic rod is connected with the frame; the extrusion mechanism comprises a contact disc and a partition plate; the upper side of the contact disc is hingedly connected with the lower end of the hydraulic rod; the lower side of the contact disc is provided with a plurality of extrusion blocks; the partition plate is slidingly arranged on the lower side of the contact disc; the partition plate comprises a plurality of ring plates, the ring plates are coaxial with the contact disc, and the ring plates are sequentially distributed from inside to outside; a plurality of connecting plates are fixedly connected between adjacent two ring plates, the connecting plates are arranged along the circumference of the contact disc and separate the space between the adjacent two ring plates into a plurality of limiting spaces; each extrusion block is arranged in a corresponding limiting space; the extrusion mechanism has a first state and a second state; in the first state, the extrusion blocks are outside the limiting spaces and on the upper side of the partition plate; in the second state, the extrusion blocks are in the limiting spaces, and the lower side of the extrusion block is coplanar with the lower side of the ring plate; when the extrusion mechanism is in the first state, the hydraulic rod drives the contact disc and the partition plate to move downward synchronously, the partition plate first contacts the sand and forms a preliminary limit, then the extrusion blocks move downward relative to the partition plate and extrude the sand, until the lower side of the extrusion block is coplanar with the lower side of the ring plate, and the extrusion mechanism is converted to the second state.

2. The casting sand mold molding machine according to claim 1, characterized in that: further comprising an adjusting mechanism, the adjusting mechanism comprises a plurality of adjusting assemblies, and the adjusting assemblies are sequentially distributed along the circumference of the contact disc; each adjusting assembly comprises a scraper and an adjusting unit, the scraper is slidingly arranged on the contact disc along the radial direction of the contact disc; the scraper is obliquely arranged, and when the contact disc rotates, the scraper in the adjusting assembly on the downward inclined side of the contact disc gradually moves away from the contact disc under the action of the adjusting unit.

3. The casting sand mold molding machine according to claim 2, characterized in that: a connecting ring is fixedly arranged on the hydraulic rod, and the connecting ring is coaxially arranged with the hydraulic rod; each adjusting unit comprises a connecting shaft, a gear and a soft rope; the connecting shaft is rotatably arranged on the contact disc, and the axis of the connecting shaft is arranged along the tangential direction of the contact disc; the gear is arranged on the connecting shaft; the upper side of each scraper is fixedly provided with a rack, and the rack is arranged along the radial direction of the contact disc; each gear is engaged with the rack; the upper end of the soft rope is fixedly connected with the connecting ring, and the lower end of the soft rope is fixed to the gear and wound thereon; when the contact disc rotates, the soft rope in the adjusting assembly on the downward inclined side of the contact disc is pulled tight and drives the corresponding gear to rotate.

4. The casting sand mold molding machine according to claim 3, characterized in that: the scraper and the gear are connected by a volute spring, and the volute spring is used to reset the gear.

5. The casting sand mold molding machine according to claim 3, characterized in that: further comprising a plurality of tension springs, and the tension springs are sequentially distributed along the circumference of the contact disc; the two ends of each tension spring are respectively connected with the connecting ring and the upper side of the contact disc, so that the contact disc remains coaxial with the hydraulic rod when not in contact with the sand.

6. The casting sand mold molding machine according to claim 1, characterized in that: ​ ​ ​ ​ ​ The lower side of the partition plate is curved, and the middle part of the partition plate is higher than the edge of the partition plate; the lower sides of the plurality of extrusion blocks collectively form a curved surface parallel to the lower side of the partition plate to limit the flow of the sand at the edge of the partition plate.

7. The sand mold molding machine of claim 1, wherein: The contact disc is fixedly provided with a limiting rod, the limiting rod is vertically arranged, and the lower end of the limiting rod is fixedly provided with a first stop block; the partition plate is provided with a limiting groove, the limiting groove is fixedly provided with a second stop block, and the lower end of the limiting rod is slidingly arranged in the limiting groove; when the extrusion mechanism is in the first state, the first stop block and the second stop block abut against each other to limit the limiting rod from being taken out of the limiting groove.

8. The sand mold molding machine of claim 1, wherein: The extrusion mechanism further comprises a first spring, the first spring is connected with the contact disc and the partition plate, and the first spring provides an initial pre-tightening force for the partition plate to extrude the sand.

9. The sand mold molding machine of claim 1, further comprising: A molding sand disc is arranged on the rack, the molding sand disc is arranged below the partition plate, and the molding sand disc is used for containing the sand.

10. The sand mold molding machine of claim 9, further comprising: A vibrating machine is arranged on the rack, the vibrating machine is connected with the molding sand disc, and the vibrating machine is used for vibrating the molding sand disc.

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