A flasking apparatus for a coated sand casting box

Abstract

The utility model relates to the field of sanding equipment, concretely to a sanding device for film-coated foundry sand box, including sand box, the lower part of sand box is provided with first base, the top of first base is fixedly connected with two side plates, one side of first base is fixedly connected with second base, the top of second base is provided with hydraulic rod, two fixed bases are installed on the hydraulic rod, the bottom surface of fixed base is fixedly connected with the top of second base, the hydraulic rod is fixedly connected with second base through fixed base, the upper part of first base is provided with box turning assembly, box turning assembly is located the lower part of sand box, the upper part of box turning assembly is provided with mounting assembly. Compared with prior art, the patent is driven by the mechanical linkage mechanism composed of convex slide block, rotating plate, connecting block and side plate with inclined guide groove through single hydraulic rod, converts linear motion into accurate 90 degree overturning motion automatically, solves the technical problem that multiple power source control is complex and operation reliability is poor.

Description

Technical Field

[0001] This utility model relates to the field of sand casting equipment, specifically a sand casting device for coated casting sand boxes. Background Technology

[0002] A coated casting sand box is a container used to manufacture coated sand molds. Coated sand is a molding material with a resin film wrapped around the surface of sand grains, which solidifies upon heating. After casting, the casting and molding sand are encased in a sturdy sand box. Reversing the sand box allows the casting and any expired molding sand to detach automatically under gravity, separating the casting from the mold, allowing for the removal of the casting and the recycling of the sand. The sand box is typically an open-top box. When rotated 90° so that the opening faces downwards, the casting and sand inside can completely and naturally pour out under gravity. Rotating beyond 90° is unnecessary and can easily lead to structural interference between the sand box and equipment, increasing the risk of instability. A 90° rotation is the most economical, efficient angle that fully meets the requirements for sand box cleaning.

[0003] Chinese Patent No. CN215162087U discloses a sand-turning device for coated casting sandboxes, which includes a sandbox, a running platform, and a sand-turning mechanism. The sandbox is a cuboid with an open top, and protruding pry bars are provided on both sides of the sandbox. The running platform includes a base with a slide rail and a support platform. The support platform moves along the base via rollers at the bottom. The base is provided with a hydraulic cylinder to drive the support platform to move. The sand-turning mechanism includes a flipping seat provided on both sides of the sandbox. The flipping seat is provided with a flipping frame and a hydraulic cylinder to drive the flipping frame to flip. The flipping frame is fixed with a connecting rod that can engage with the pry bars.

[0004] This invention can automatically rotate the sandbox more than 90°, safely and efficiently emptying the castings and sand inside. However, a prior art sand-turning device for coated casting sandboxes has the following drawbacks during operation:

[0005] The existing sand-casting devices have the following drawbacks during operation:

[0006] (1) The existing technology has realized the function of conveying and flipping sand boxes by setting up a dual-cylinder timing system that controls translation and flipping respectively. However, the existing dual-power source structure has a complex control system, high coordination requirements and the risk of motion interference.

[0007] (2) Existing technology relies entirely on the combination of the connecting rod and the pry bar on the flipping frame to achieve connection and positioning during flipping. This results in insufficient positioning accuracy, inconvenient disassembly and assembly, and poor connection stability at the beginning and end of the flipping process. Utility Model Content

[0008] This utility model aims to provide a sand-turning device for coated casting sand boxes, mainly to solve the technical problems of existing dual-power source structures, such as complex control systems, high coordination requirements, and the risk of motion interference.

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0010] A sand-turning device for coated casting sandboxes includes a sandbox, a first base disposed below the sandbox, two side plates fixedly connected to the top surface of the first base, a second base fixedly connected to one side of the first base, a hydraulic rod disposed on the top surface of the second base, two fixed seats mounted on the hydraulic rod, the bottom surface of the fixed seats being fixedly connected to the top surface of the second base, the hydraulic rod being fixedly connected to the second base through the fixed seats, a sandbox-turning assembly disposed above the first base, the sandbox-turning assembly being located below the sandbox, an installation assembly disposed above the sandbox-turning assembly, the installation assembly being connected to the bottom surface of the sandbox, and the sandbox-turning assembly being connected to the telescopic end of the hydraulic rod.

[0011] The working principle and beneficial effects of this utility model:

[0012] 1. Working Principle: This sand-turning device drives the sand-turning assembly via a hydraulic rod. When the hydraulic rod retracts, it pushes the sand-turning assembly horizontally. The guide structure on it slides in the inclined guide rails, converting the horizontal thrust into rotational torque, thereby causing the upper mounting components and sand box to rotate 90°, completing the sand-turning operation. After completion, the hydraulic rod extends, driving the entire mechanism to move in the opposite direction, allowing the sand box to smoothly return to a horizontal position. The mounting components adopt a sliding and locking design, facilitating quick disassembly and replacement of the sand box.

[0013] 2. Beneficial effects:

[0014] (1) The existing technology has realized the conveying and flipping functions of sandbox by setting up a dual-cylinder timing coordination system that controls translation and flipping respectively. However, the existing dual-power source structure has technical problems such as complex control system, high coordination requirements and risk of motion interference. This solution solves the technical problems of complex control and poor operation reliability of multi-power source by setting up a mechanical linkage mechanism consisting of a convex slider, rotating plate, connecting block and side plate with inclined guide groove by setting up a single hydraulic rod to drive the linear motion to automatically convert the linear motion into a precise 90° flipping motion.

[0015] (2) This solution achieves reliable positioning and quick assembly / disassembly of the sandbox in the horizontal working position by setting up an installation assembly consisting of T-shaped blocks, concave plates and bolts, and cooperating with the support block on the top of the side plate.

[0016] Preferably, the box-flipping assembly includes a convex slider located above the first base. The convex slider is fixedly connected to the telescopic end of a hydraulic rod and slidably connected to the first base. Inverted L-shaped rods are provided on both side walls of the convex slider near the side plate, and the convex slider is located between two inverted L-shaped rods, slidably connected to them. A rotating plate is fixedly connected to the top of the convex slider. Rotating shafts are fixedly connected to both the left and right sides of the rotating plate. Connecting blocks are provided on both the left and right sides of the rotating plate, and the connecting blocks are connected to corresponding... The rotating shaft is rotatably connected, and a guide rod is fixedly connected to the side of the connecting block near the corresponding side plate. Guide grooves are opened on the side walls of both side plates, and the guide rod is located in the corresponding guide groove. The guide rod slides and rotates with the inner wall of the guide groove. The box-turning assembly in this sand-turning device is slidably connected to the first base through a convex slider. Under the drive of the hydraulic rod, it achieves stable translational movement. The inverted L-shaped rods on both sides of the convex slider form a sliding pair constraint to ensure that there is no deflection during the translation process. When the convex slider pushes the rotating plate forward, the rotating shaft fixed on both sides of the rotating plate drives the connecting block to move.

[0017] Preferably, the rotating shaft and the guide rod are not concentric. The rotating shaft is located on the side of the connecting block closer to the second base, and the guide rod is located on the side of the connecting block away from the second base. Due to the eccentricity between the rotating shaft and the guide rod, the inclined layout of the guide groove converts the horizontal thrust into a combined lifting and rotational motion of the connecting block, thereby realizing the flipping function of the sandbox.

[0018] Preferably, the guide groove is inclined, with the end of the guide groove closer to the second base being higher than the end farther from the second base. The guide groove adopts an inclined design with the end closer to the hydraulic rod being higher and the end farther away being lower, so that the guide rod will have a height change during the sliding process. This structure converts the horizontal linear motion of the convex slider into the rotational lifting action of the connecting block through the inclined plane guiding principle. Its inclination angle determines the magnitude of the flipping torque and the flipping speed. The optimized angle can obtain a larger flipping torque while keeping the hydraulic rod thrust constant, and at the same time reduce energy loss.

[0019] Preferably, the installation assembly includes a flipping platform located above the connecting blocks. The flipping platform is fixedly connected to the top surfaces of the two connecting blocks. Two T-shaped blocks are fixedly connected to the top surface of the flipping platform. A concave plate is slidably connected to each of the two T-shaped blocks. The top ends of the two concave plates are fixedly connected to the bottom surface of the same sandbox. A baffle is fixedly connected to the top surface of the flipping platform, located on one side of the concave plates. A threaded hole is formed on the top surface of each T-shaped block, located on the side away from the baffle. A through hole is formed on the top surface of each concave plate, communicating with the corresponding threaded hole. A bolt is installed in the threaded hole, passing through the corresponding through hole and extending into the threaded hole, and the bolt is threadedly connected to the corresponding threaded hole. A washer is installed between the bolt nut and the T-block, with the bottom surface of the washer tightly fitting and abutting against the top surface of the T-block. The installation assembly is specifically designed for operators to quickly and safely assemble and disassemble the sandbox. The flipping platform is fixed to the flipping assembly, forming the basis for installation. The sandbox slides between its bottom concave plate and the T-block on the platform, allowing personnel to easily push the heavy sandbox into the installation position without precise hoisting and alignment, providing good tolerance. The baffle acts as a rigid positioning block, ensuring that the sandbox can quickly and accurately reach the predetermined position each time. Finally, the bolt is screwed into the threaded hole of the T-block from above through the concave plate to complete the fastening. The washer effectively prevents loosening during vibration. This design makes the assembly and disassembly operations simple, quick, safe, and reliable.

[0020] Preferably, both side plates have clearance grooves on their top surfaces. The clearance grooves are located on the side of the side plate near the second base. A support rod is fixedly connected to the inner wall of the clearance groove. Two support blocks are fixedly connected to the top surface of the support rod. The top surfaces of the two support blocks abut against the bottom surface of the same sandbox. The clearance grooves on the top of the side plates provide necessary space for movement during the sandbox flipping process. The support mechanism composed of the support rod and the support blocks plays an auxiliary support role when the sandbox is in its initial position. Its height is precisely calculated so that it does not affect the normal flipping action and can effectively reduce the load pressure on the flipping platform in the non-working state, thus extending the service life of the hydraulic rod. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a sand-turning device for a coated casting sand box, which is part of this utility model patent.

[0022] Figure 2 This is a structural diagram of the first base area of ​​a sand-turning device for a coated casting sand box according to this utility model patent.

[0023] Figure 3 This is an exploded view of the rotating plate area of ​​a sand-turning device for a coated casting sand box, as described in this utility model patent.

[0024] Figure 4 This is an exploded view of the concave plate area of ​​a sand-turning device for a coated casting sand box, which is part of this utility model patent.

[0025] The reference numerals in the accompanying drawings of the instruction manual include: 1. Sandbox; 2. First base; 3. Side plate; 4. Second base; 5. Hydraulic rod; 6. Fixed seat; 7. Convex slider; 8. Inverted L-shaped rod; 9. Rotating plate; 10. Rotating shaft; 11. Connecting block; 12. Guide rod; 13. Guide groove; 14. Tilting platform; 15. Relief groove; 16. Support rod; 17. Support block; 18. T-shaped block; 19. Concave plate; 20. Baffle; 21. Threaded hole; 22. Through hole; 23. Bolt; 24. Washer. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figure 1 - Figure 4 As shown, a sand-turning device for coated casting sand boxes includes a sand box 1. A first base 2 is disposed below the sand box 1. Two side plates 3 are fixedly connected to the top surface of the first base 2. A second base 4 is fixedly connected to one side of the first base 2. A hydraulic rod 5 is disposed on the top surface of the second base 4. Two fixing seats 6 are mounted on the hydraulic rod 5. The bottom surface of the fixing seats 6 is fixedly connected to the top surface of the second base 4. The hydraulic rod 5 is fixedly connected to the second base 4 through the fixing seats 6. A sand-turning assembly is disposed above the first base 2, located below the sand box 1. An installation assembly is disposed above the sand-turning assembly. Connected to the bottom of the sandbox 1, the flipping assembly is connected to the telescopic end of the hydraulic rod 5. The flipping action of this device is powered by the hydraulic rod 5, whose telescopic end directly pushes the convex slider 7 to make precise linear motion on the first base 2. The inverted L-shaped rods 8 on both sides of the convex slider 7 form a key sliding pair, which can effectively resist the lateral torque generated during the flipping process, ensuring that the movement trajectory of the convex slider 7 does not deviate, and providing a stable and reliable linear input for subsequent motion conversion. Its beneficial effect is that it ensures the accuracy of the motion from the power source, laying a solid foundation for the smooth and reliable flipping process.

[0028] More specifically, the flip-up assembly includes a convex slider 7, which is located above the first base 2. The convex slider 7 is fixedly connected to the telescopic end of the hydraulic rod 5 and slidably connected to the first base 2. Inverted L-shaped rods 8 are provided on both side walls of the convex slider 7 near the side plate 3. The convex slider 7 is located between the two inverted L-shaped rods 8 and slidably connected to them. A rotating plate 9 is fixedly connected to the top of the convex slider 7. Rotating shafts 10 are fixedly connected to both sides of the rotating plate 9. Connecting blocks 11 are provided on both sides of the rotating plate 9, and the connecting blocks 11 are rotatably connected to the corresponding rotating shafts 10. A guide rod 12 is fixedly connected to the side of the connecting block 11 near the corresponding side plate 3. Both side walls of the side plates 3 are... A guide groove 13 is provided, and a guide rod 12 is located in the corresponding guide groove 13. The guide rod 12 slides and rotates with the inner wall of the guide groove 13. The core principle of the flipping box lies in the conversion of motion form. The rotating plate 9 and the rotating shaft 10 fixed to the top of the convex slider 7 move horizontally with the slider. Since the connecting block 11 and the rotating shaft 10 are rotatably connected, and the guide rod 12 on the connecting block 11 is constrained in the fixed guide groove 13 of the side plate 3, the motion of the connecting block 11 is forcibly decomposed into horizontal movement and rotation around the rotating shaft 10. Its beneficial effect is that it cleverly uses sliding constraints and rotational constraints to automatically and mechanically convert the simple linear input of the hydraulic cylinder into a complex flipping motion without the need for an additional control system. The structure is simple and reliable.

[0029] More specifically, the rotating shaft 10 and the guide rod 12 are not concentric. The rotating shaft 10 is located on the side of the connecting block 11 closer to the second base 4, and the guide rod 12 is located on the side of the connecting block 11 away from the second base 4. The concentric design of the rotating shaft 10 and the guide rod 12 is the mechanical core that generates the necessary overturning torque. This eccentric structure forms a lever arm on the connecting block 11. When the guide rod 12 moves under the constraint of the guide groove 13, the reaction force acting on the guide rod 12 has a perpendicular distance from the center of the rotating shaft 10, thereby generating a strong torque to overcome the huge weight and inertia of the sand box 1 and the molding sand. Its beneficial effect is that it greatly optimizes the utilization efficiency of hydraulic thrust, enabling the hydraulic rod 5 to achieve the smooth overturning of the heavy sand box with a smaller thrust output, reducing equipment energy consumption and the tonnage requirements of the hydraulic system.

[0030] More specifically, the guide groove 13 is inclined, with the end of the guide groove 13 closer to the second base 4 being higher than the end farther from the second base 4. The inclined setting of the guide groove 13 determines the trajectory and characteristics of the flipping motion. Its higher position at the end closer to the second base 4 allows the guide rod 12 to gain an upward component in the early stage of the movement, forcing the connecting block 11 and the flipping platform 14 to start lifting at the same time as they begin to move horizontally. Its beneficial effect is that it plans an optimal motion path, making the flipping action of the sandbox 1 more in line with ergonomics and process requirements. The whole action is smooth, efficient, and continuous, avoiding sudden stops or impacts and extending the service life of the equipment.

[0031] More specifically, the installation assembly includes a flip platform 14, located above the connecting blocks 11. The flip platform 14 is fixedly connected to the top surfaces of the two connecting blocks 11. Two T-shaped blocks 18 are fixedly connected to the top surface of the flip platform 14, and concave plates 19 are slidably connected to each of the two T-shaped blocks 18. The top ends of the two concave plates 19 are fixedly connected to the bottom surface of the same sandbox 1. A baffle 20 is fixedly connected to the top surface of the flip platform 14, located on one side of the concave plates 19. A threaded hole 21 is opened on the top surface of the T-shaped blocks 18, located on the side away from the baffle. A through hole 22 is opened on the top surface of the concave plates 19, communicating with the corresponding threaded hole 21. A bolt 23 is installed in the threaded hole 21, penetrating the corresponding through hole 22 and extending into the threaded hole 21. The bolt 23 communicates with the corresponding threaded hole 21. The threaded hole 21 is threaded to the corresponding location. A washer 24 is installed between the nut of the bolt 23 and the T-block 18. The bottom surface of the washer 24 is in close contact with the top surface of the T-block 18 and abuts against it. The design principle of the installation component focuses on rapid positioning and safe locking. The sand box 1 achieves initial installation and rough positioning through the sliding cooperation between the concave plate 19 at its bottom and the T-block 18 fixed on the flipping platform 14. The baffle 20 acts as a hard limit device to ensure that the sand box 1 stops after being pushed to the predetermined position. The final tightening is completed by the cooperation of the bolt 23, washer 24 and threaded hole 21 on the T-block 18. Its beneficial effect is to realize the rapid disassembly and assembly and precise positioning of the sand box 1, which greatly improves production efficiency. The bolt 23 is tightened from above, which is convenient to operate. The washer 24 enhances the anti-loosening performance of the connection and ensures the safety of operation under repeated vibration.

[0032] More specifically, each of the two side plates 3 has a clearance groove 15 on its top surface. The clearance groove 15 is located on the side of the side plate 3 near the second base 4. A support rod 16 is fixedly connected to the inner wall of the clearance groove 15. Two support blocks 17 are fixedly connected to the top surface of the support rod 16. The top surfaces of the two support blocks 17 abut against the bottom surface of the same sandbox 1. The principle of the clearance groove 15, support rod 16 and support blocks 17 is to provide space and support for different working states. During the flipping process, the clearance groove 15 provides necessary space for the tilted part of the sandbox 1 to avoid mechanical interference. The support blocks 17 provide a stable temporary support platform for the bottom of the sandbox 1 when not in use. The benefits are twofold: on the one hand, it ensures the integrity and non-interference of the flipping action; on the other hand, it greatly reduces the labor intensity of the operators. During installation and disassembly, it is not necessary to suspend the heavy sandbox at all times, which improves the safety and convenience of operation.

[0033] As can be seen from the above, the specific embodiments of this utility model are as follows:

[0034] Initially, the sandbox 1 is placed horizontally on the tilting platform 14, with its bottom supported by the support block 17. When the equipment is started, the telescopic end of the hydraulic rod 5 retracts, pulling the convex slider 7, which is fixedly connected to it, to slide horizontally from the first base 2 towards the second base 4. The convex slider 7 drives the two rotating shafts 10 to move synchronously through the rotating plate 9 at the top. The rotating shafts 10 then push the connecting blocks 11 on both sides to start moving. The guide rod 12 on each connecting block 11 is constrained in the inclined guide groove 13 on the side plate 3. Since the end of the guide groove 13 near the second base 4 is higher, the guide rod 12 forces the connecting block 11 to rotate around the rotating shaft 10 when sliding in the groove. Since the axis of the rotating shaft 10 and the axis of the guide rod 12 are not concentric, this eccentric structure reliably converts the horizontal linear motion of the connecting block 11 into rotational motion. The tilting platform 14, which is fixedly connected to the top surface of the connecting block 11, moves accordingly, causing the sandbox 1, which is fixed to it by the T-shaped block 18, the concave plate 19, and the bolts 23, to move horizontally together. The combined motion of the flipping mechanism involves the convex slider 7 reaching its travel end, at which point the guide rod 12 slides to the end of the guide groove 13 away from the second base 4. At this point, the connecting block 11 rotates exactly 90°, thus precisely flipping the sandbox 1 90° and stabilizing it in the overturned position for sand turning. After sand turning is completed, the telescopic end of the hydraulic rod 5 extends, pushing the convex slider 7 to move in the opposite direction. Through the reverse motion of the above mechanism, the flipping platform 14 and the sandbox 1 are driven to retract horizontally and rotate 90° in the opposite direction. Finally, the sandbox is restored to its initial horizontal state. At this time, the bottom of the sandbox 1 is supported by the support block 17 again. When the sandbox 1 needs to be replaced or maintained, the personnel can loosen the bolt 23 to unlock the concave plate 19 and the T-shaped block 18, and then slide the sandbox 1 together with the concave plate 19 out along the T-shaped block 18 for disassembly. During installation, align the concave plate 19 at the bottom of the sandbox 1 with the T-shaped block 18 and push it in so that the through hole 22 is aligned with the threaded hole 21. Then tighten the bolt 23 to complete the fixation, realizing the quick disassembly and assembly function of the sandbox.

[0035] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A sand-turning device for coated casting sandboxes, comprising a sandbox (1), characterized in that: A first base (2) is provided below the sandbox (1). Two side plates (3) are fixedly connected to the top surface of the first base (2). A second base (4) is fixedly connected to one side of the first base (2). A hydraulic rod (5) is provided on the top surface of the second base (4). Two fixed seats (6) are installed on the hydraulic rod (5). The bottom surface of the fixed seat (6) is fixedly connected to the top surface of the second base (4). The hydraulic rod (5) is fixedly connected to the second base (4) through the fixed seat (6). A flipping assembly is provided above the first base (2). The flipping assembly is located below the sandbox (1). An installation assembly is provided above the flipping assembly. The installation assembly is connected to the bottom surface of the sandbox (1). The flipping assembly is connected to the telescopic end of the hydraulic rod (5).

2. The sand-turning device for coated casting sand boxes according to claim 1, characterized in that: The box-flipping assembly includes a convex slider (7), which is located above the first base (2). The convex slider (7) is fixedly connected to the telescopic end of the hydraulic rod (5). The convex slider (7) is slidably connected to the first base (2). The two side walls of the convex slider (7) near the side plate (3) are provided with inverted L-shaped rods (8). The convex slider (7) is located between the two inverted L-shaped rods (8). The convex slider (7) is slidably connected to the inverted L-shaped rods (8). A rotating plate (9) is fixedly connected to the top of the convex slider (7). Rotating shafts (10) are fixedly connected to both the left and right sides of the rotating plate (9). Connecting blocks (11) are provided on both the left and right sides of the rotating plate (9). The connecting blocks (11) are rotatably connected to the corresponding rotating shafts (10). A guide rod (12) is fixedly connected to the side of the connecting block (11) near the corresponding side plate (3). Guide grooves (13) are provided on the side walls of both side plates (3). The guide rod (12) is located in the corresponding guide groove (13). The guide rod (12) slides and rotates with the inner wall of the guide groove (13).

3. The sand-turning device for coated casting sand boxes according to claim 2, characterized in that: The rotating shaft (10) and the guide rod (12) are not concentric. The rotating shaft (10) is located on the side of the connecting block (11) closer to the second base (4), and the guide rod (12) is located on the side of the connecting block (11) away from the second base (4).

4. A sand-turning device for coated casting sand boxes according to claim 2, characterized in that: The guide groove (13) is inclined, and the end of the guide groove (13) near the second base (4) is higher than the end away from the second base (4).

5. A sand-turning device for coated casting sand boxes according to claim 2, characterized in that: The installation assembly includes a flipping platform (14) located above the connecting blocks (11). The flipping platform (14) is fixedly connected to the top surfaces of the two connecting blocks (11). Two T-shaped blocks (18) are fixedly connected to the top surface of the flipping platform (14). Concave plates (19) are slidably connected to each of the two T-shaped blocks (18). The top ends of the two concave plates (19) are fixedly connected to the bottom surface of the same sandbox (1). A baffle (20) is fixedly connected to the top surface of the flipping platform (14). The baffle (20) is located on one side of the concave plates (19). The top surface of the T-shaped blocks (18) has an opening. The concave plate (19) has a threaded hole (21) located on the side away from the baffle (20). The top surface of the concave plate (19) has a through hole (22) connected to the corresponding threaded hole (21). A bolt (23) is provided in the threaded hole (21). The bolt (23) passes through the corresponding through hole (22) and extends into the threaded hole (21). The bolt (23) is threadedly connected to the corresponding threaded hole (21). A washer (24) is installed between the nut of the bolt (23) and the T-shaped block (18). The bottom surface of the washer (24) is tightly attached to and abuts against the top surface of the T-shaped block (18).

6. The sand-turning device for coated casting sand boxes according to claim 1, characterized in that: The top surfaces of both side plates (3) are provided with clearance grooves (15). The clearance grooves (15) are located on the side of the side plate (3) near the second base (4). The inner wall of the clearance grooves (15) is fixedly connected with a support rod (16). The top surface of the support rod (16) is fixedly connected with two support blocks (17). The top surfaces of the two support blocks (17) abut against the bottom surface of the same sandbox (1).

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