Coated sand transfer hopper

Abstract

The present application relates to the technical field of film-coated sand transfer, in particular to a film-coated sand transfer hopper capable of quickly dropping sand and unloading, which comprises a transfer hopper body, a bottom plate, the bottom plate is installed at the bottom of the transfer hopper body, and the bottom plate and the transfer hopper body jointly form a cavity for loading film-coated sand, further comprising a quick unloading mechanism, the bottom of the transfer hopper body is provided with the quick unloading mechanism matched with the bottom plate, the quick unloading mechanism comprises a support installed at the top end of the transfer hopper body, a rocker arm is installed on the support, a lock hook is arranged on the rocker arm, a handle is installed on the transfer hopper body and matched with the lock hook, an installation plate is installed on the rocker arm, a plurality of steel wires I extending into the inside of the transfer hopper body are installed on the installation plate, and the other ends of the plurality of steel wires I are arranged on the plurality of bottom plates respectively. The film-coated sand in the present application is quickly unloaded through the quick unloading mechanism, which completely opens the bottom of the transfer hopper when unloading.

Description

Technical Field

[0001] This invention relates to the field of coated sand transfer technology, specifically a coated sand transfer bucket that can quickly discharge and unload sand. Background Technology

[0002] As a material transfer device, the transfer bucket has been widely used in the field of sand transfer.

[0003] Today, coated sand casting technology has gained a place in the casting industry due to its advantages such as good collapsibility, high surface precision of the produced castings, and fewer defects in the produced castings. However, the coated sand used in this casting process becomes waste sand after use and cannot be reused. The amount of coated sand waste generated in my country every year is huge and this number is still growing, which cannot be ignored.

[0004] In existing processes, a recycling scheme has been proposed for these waste sands. First, the foundry transports the collected waste sand to a recycling company. The recycling company then uses a calcination thermal regeneration method to regenerate the waste sand into recycled silica sand with properties close to the original sand. This recycled silica sand is then transported to a coated sand production company, which uses this recycled silica sand to produce new coated sand, thus completing the recycling of the waste sand. This method can achieve a waste sand recycling rate of over 80%, and even up to 99%, greatly improving the recycling rate of silica sand resources.

[0005] In the process of collecting waste sand in foundry enterprises, considering economic factors, waste sand is usually not bagged, but rather collected and concentrated directly using transfer hoppers. Existing transfer hoppers, to ensure complete discharge of sand during unloading, often employ a funnel-shaped design at the bottom, and the size of the discharge opening is usually fixed. This means that the unloading capacity of the transfer hopper is limited by the size of its discharge opening. For example, when the transfer hopper unloads waste sand into a silo used for collecting waste sand, if the size of the transfer hopper's discharge opening is smaller than the silo's inlet, the rate at which waste sand falls from the transfer hopper into the silo is limited by the size of the transfer hopper's discharge opening, and the silo's inlet cannot fully utilize its waste sand receiving capacity. Thus, the unloading and transfer efficiency of waste sand is limited.

[0006] To address this, a coated sand transfer bucket with rapid sand discharge is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a coated sand transfer bucket that can quickly discharge sand. By using a fast discharge mechanism, the bottom of the transfer bucket is fully open during discharge, allowing the coated sand in this invention to be discharged quickly, thereby solving the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A coated sand transfer hopper for rapid sand discharge includes:

[0010] Transfer bucket body, bottom plate;

[0011] The bottom plate is installed at the bottom of the transfer bucket body, and the bottom plate and the transfer bucket body together form a cavity for loading coated sand, and also includes:

[0012] The quick discharge mechanism is provided at the bottom of the transfer bucket body and cooperates with the bottom plate. When unloading, the quick discharge mechanism makes the bottom of the transfer bucket body completely open, so that the coated sand in the transfer bucket body can be discharged quickly.

[0013] The fast material discharge mechanism includes a support installed at the top of the transfer bucket body, a rocker arm installed on the support, a locking hook provided on the rocker arm, a handle that cooperates with the locking hook installed on the transfer bucket body, an mounting plate installed on the rocker arm, and multiple steel wire ropes extending into the transfer bucket body installed on the mounting plate. Multiple base plates are provided at the bottom of the transfer bucket body, and the other ends of the multiple steel wire ropes are respectively set on the multiple base plates.

[0014] Several points are worth noting: First, the rocker arm can be divided into a resistance arm suspended above the transfer bucket body and a power arm suspended outside the transfer bucket body, with its corresponding support as the dividing line; second, multiple base plates are rotatably mounted on the side wall of the transfer bucket body through preset supports; third, the locking hook is installed at the lower end of the power arm of the rocker arm; and fourth, the handle is rotatably mounted on the outside of the transfer bucket body through preset supports.

[0015] Based on this technical solution, when the present invention needs to load coated sand, the power arm of the rocker arm is pressed down. Under the action of the mounting plate and multiple steel wire ropes, multiple base plates rotate upward around their respective supports simultaneously until every two adjacent base plates are engaged, so that multiple base plates together form the bottom of the transfer bucket body. At this time, multiple base plates and the transfer bucket body cooperate to form a cavity for loading coated sand. Then, the handle is turned and locked onto the locking hook to restrict the rotation of the rocker arm, so that multiple base plates remain engaged and cannot be opened. Thus, the cavity for loading coated sand maintains its shape stably, which means that the present invention is in a state where coated sand can be loaded.

[0016] When the present invention is loaded with coated sand, if unloading is required, the handle is removed from the locking hook. At this time, the rotation of the rocker arm is no longer restricted. Under the gravity of the coated sand, multiple bottom plates open downwards simultaneously, and the coated sand loaded in the present invention pours out from the fully open bottom. More specifically, all the coated sand in the cavity of the present invention falls out at the same time, unlike the funnel-shaped transfer hopper of the prior art, which requires the sand inside to be unloaded gradually from the center to the periphery, thereby achieving rapid sand dropping and unloading.

[0017] In a preferred embodiment of the present invention, the transfer bucket body is provided with a guide cylinder and a plurality of fixing rods for fixing the guide cylinder. The opening of the guide cylinder faces downward. The two ends of the plurality of fixing rods are respectively connected to the outer wall of the guide cylinder and the inner wall of the transfer bucket body. A support rod is movably installed inside the guide cylinder. A support part for supporting a plurality of base plates is installed at the bottom end of the support rod. A boss is fixedly installed on the support rod. A collar is sleeved on the support rod. The collar is located below the boss. A plurality of steel wire ropes are connected to the outer side of the collar. A plurality of steel wire ropes are installed on the collar. The other end of the plurality of steel wire ropes is connected to a plurality of base plates respectively.

[0018] The supporting part is a support platform.

[0019] A spring is fixedly installed on the boss, and the other end of the spring is fixedly connected to the bottom end of the guide cylinder.

[0020] The side edges of the base plate are serrated, and the serrated edges between every two adjacent base plates are mutually matched.

[0021] The guide cylinder is cylindrical in shape. The top of the guide cylinder is closed.

[0022] It should be noted that at the end of the base plate near the center of the transfer bucket body, when multiple base plates are fitted together, there will inevitably still be a gap. Moreover, this gap will increase with the number of base plates, which may cause leakage when loading coated sand. To better understand the reason for the existence of this gap, we can consider each base plate as a triangle. Ideally, when multiple base plates are fitted together, the endpoints of the multiple base plates near the center of the transfer bucket body should coincide. However, the limitations of actual manufacturing precision and fitting precision make this almost impossible, especially for this invention which needs to frequently load large amounts of coated sand. First, the manufacturing precision of the transfer bucket is limited by its manufacturing cost, and frequent high-load operation will also affect the fitting precision between the base plate and its base. Therefore, the gap between the multiple base plates cannot be eliminated.

[0023] Therefore, by setting up support rods and support platforms, the aforementioned gaps are sealed by the support platforms. Specifically, when the invention is in the state where it can be loaded with coated sand, multiple base plates are placed on the support platforms. Therefore, the space at the center of the transfer bucket body is actually occupied by the support rods and support platforms and does not need to be sealed. Thus, the part that needs to be sealed becomes the gap between the multiple base plates and the support platforms. The specific principle for sealing this gap is as follows: When the invention is in the state where it can be loaded with coated sand, the base plates are placed on the support platforms. Due to the interaction of the rocker arm, wire rope, collar, and boss, the support platform will be pressed against the multiple base plates, thereby sealing the gap between the base plates and the support platforms and preventing leakage of coated sand.

[0024] It is worth mentioning that in this technical solution, when the present invention is in the state of being able to load coated sand, the support platform supports multiple base plates. This means that the support platform at this time actually hinders the rotation of the base plates. That is to say, the position of the support platform at this time interferes with the rotation trajectory of the base plates. However, during the process of multiple base plates rotating upward and gradually cooperating, the support platform cannot hinder the rotation of the base plates. Therefore, a spring, a collar, and multiple steel wire ropes are set between the support rod and the guide cylinder.

[0025] By setting up a spring, a collar, and multiple steel wire ropes, when the power arm of the rocker arm is initially pressed down, because the steel wire ropes do not directly act on the support rod, the support rod remains stationary under the elastic force of the spring, in a position that does not interfere with the rotation trajectory of the multiple base plates. The collar first slides upward on the support rod, and then, through the multiple steel wire ropes, the collar drives the multiple base plates to rotate upward until the top of the collar contacts the bottom end of the boss on the support rod. Only then does the support rod begin to slide upward within the guide cylinder. At this point, the height of the end of the multiple base plates near the center of the transfer bucket body has reached above the support platform through rotation. This means that even if the support platform interferes with the rotation trajectory of the base plates at this time, it can only prevent the multiple base plates from rotating downward, but cannot prevent the multiple base plates from continuing to rotate upward and cooperate. If the rocker arm is pressed down further at this time, the spring is compressed, the support platform abuts against the multiple base plates, and then the handle is hooked onto the locking hook, so that the invention can enter the state where coated sand can be loaded.

[0026] In short, the combined action of the spring, collar, and multiple steel wire ropes ensures a sequential action between the rotation of the base plate and the sliding of the support rod, thereby preventing the support platform from interfering with the base plate during its rotation and ensuring that the multiple base plates can work together smoothly.

[0027] It should be added that, to ensure the support platform accurately abuts against multiple base plates when the invention is in the state where it can be loaded with coated sand, the second steel wire rope should still maintain an angle with the vertical direction in this state. The reason is that the upward sliding of the collar pulls the base plate through the second steel wire rope. During the process of pulling the base plate, the second steel wire rope also rotates around its mounting support on the collar. This means that until the second steel wire rope rotates completely parallel to the vertical direction, the upward sliding distance of the collar is greater than the vertical distance moved by the end of the base plate closest to the center of the transfer bucket body. Therefore, when the collar pushes the boss on the support rod, the upward speed of the support rod is also greater than the upward speed of the end of the base plate closest to the center of the transfer bucket body. This allows the support platform to approach the multiple base plates and ultimately achieve its supporting function.

[0028] In addition, the support portion on the support rod used to support the base plate can be achieved either by using a frustum-shaped support platform or by creating a groove on the support rod. The working process is the same as that described in this technical solution, except that the part that supports multiple base plates becomes the lower wall of the groove on the support rod.

[0029] Compared to the previously mentioned support platform, the groove avoids the downward tension on the support rod due to the impact of the coated sand during unloading, thereby reducing the load on the spring and extending its service life. Specifically, on the one hand, since the spring needs to be compressed by the operator pressing down the rocker arm during the use of this invention, the spring's elastic modulus obviously cannot be too large to reduce the operator's workload; on the other hand, when using a support platform, the side of the support platform will be impacted by the coated sand during unloading, causing the spring to bear a downward tension. The magnitude of this tension is proportional to the weight of the coated sand. If this tension exceeds the spring's allowable value, it will cause the spring to be damaged. Therefore, it is easy to see that there is a contradiction between the service life of the spring and the difficulty of operation when selecting a support platform: if a long service life of the spring is desired, a larger elastic modulus is required to resist the tension applied by the coated sand. However, this will increase the force required for the worker to press down the power arm of the rocker arm to restore the invention to the state where it can be loaded with coated sand, thus increasing the difficulty of operation. Conversely, if the difficulty of operation is desired to be reduced, a smaller elastic modulus of the spring should be selected, and the ability to resist the tension applied by the coated sand will decrease.

[0030] Fortunately, this problem can be avoided by designing the support portion on the support rod as a groove. Unlike a support platform, a groove does not have a side that bears the tensile force applied by the coated sand in the vertical direction. Therefore, the spring will not bear the downward tensile force applied by the coated sand, resulting in a wider range of spring elastic moduli that can be selected, even those with lower elastic moduli. However, due to the groove, the cross-sectional area of ​​the support rod at the support portion is smaller. Consequently, the stress on the support rod at this location is greater than in other parts of the support rod, making it more prone to necking fracture. Therefore, the material selection requirements for this part are more stringent. In contrast, the advantage of using a support platform is that the cross-sectional area of ​​the entire support rod can be manufactured uniformly, avoiding excessive localized stress.

[0031] Furthermore, by setting the edges of the base plate to be serrated, when multiple base plates are fitted together, the serrations on the sides of the base plates mesh with each other. Consequently, the gap at the contact surface of two adjacent base plates forms an interlocking shape, extending the length of the fitting gap. At the same time, the fitting gap also bends in the thickness direction of the base plate. That is to say, if the coated sand leaks outward, the path it takes is a broken line rather than a straight line. Also, because there is an arching effect between the sand materials, when the fitting gap bends in the thickness direction of the base plate, the difficulty of the sand material falling out of the gap will be greatly increased. This ensures that the coated sand will not leak outward during the transfer of coated sand in this invention.

[0032] Furthermore, considering the potential friction between the wire rope and the guide cylinder, the guide cylinder should be cylindrical in shape, specifically, it should have a rounded surface without sharp edges. The reason for this is that during the rotation of the rocker arm, the mounting plate will shift horizontally. At this time, the wire rope may come into contact with and rub against the outer wall of the guide cylinder. If the guide cylinder has sharp edges, it may cause wear to the wire rope, affecting its service life. Additionally, the top of the guide cylinder is also sealed to prevent coated sand from entering the guide cylinder from above and getting stuck in the gap between the guide cylinder and the support rod, affecting the sliding of the support rod and ensuring the stability of the invention.

[0033] As a preferred embodiment of the present invention, a sand-blocking cloth for preventing the coated sand from flying is installed between each pair of adjacent base plates.

[0034] By setting up a sand-blocking cloth, when the bottom plate is opened, the coated sand unloaded from this invention will be blocked by the sand-blocking cloth and fall stably under the transfer bucket body, so as not to generate a large amount of sand and dust flying outward.

[0035] In summary, the beneficial effects of the present invention include the following:

[0036] 1. When the present invention is loaded with coated sand, if unloading is required, the handle is removed from the locking hook. At this time, the rotation of the rocker arm is no longer restricted. Under the gravity of the coated sand, multiple bottom plates open downwards simultaneously, and the coated sand loaded in the present invention pours out from the fully open bottom. More specifically, all the coated sand in the cavity of the present invention falls at the same time, unlike the funnel-shaped transfer hopper of the prior art, which requires the sand inside to be unloaded gradually from the center to the periphery, thereby achieving rapid sand unloading.

[0037] 2. By setting up a collar, wire rope one, wire rope two, and a spring, when the power arm of the rocker arm is pressed down, the support part on the support rod does not obstruct the upward rotation of multiple base plates, and then abuts against the lower end of multiple base plates to enable the invention to enter the state where it can be loaded with coated sand. Thus, the worker does not need to bend down to the bottom of the transfer bucket body to operate multiple base plates in sequence, which simplifies the operation steps of the invention.

[0038] 3. By setting up support rods and support platforms, the sealing of the present invention is optimized, preventing the coated sand from leaking out of the invention during the transfer of coated sand. Specifically, when the invention is in a state where it can be loaded with coated sand, multiple base plates are placed on the support platforms. Therefore, the space at the center of the transfer bucket body is actually occupied by the support rods and support platforms and does not need to be sealed. Thus, the part that needs to be sealed becomes the gap between the multiple base plates and the support platforms. For the sealing of this gap, through the interaction of the rocker arm, wire rope, collar, and boss, the support platform is pressed against the multiple base plates, thereby sealing the gap between the base plates and the support platform and preventing the leakage of coated sand.

[0039] 4. By setting the edge of the base plate to be serrated, when multiple base plates are fitted together, the serrations on the side of the base plate mesh with each other, extending the length of the fitting gap. At the same time, the fitting gap also bends in the thickness direction of the base plate. Because there is an arch bridge effect between the sand materials, it increases the difficulty of the sand materials falling out of the gap. This ensures that the coated sand will not leak outward during the transfer of coated sand in this invention. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 This is a front plan view of the first specific embodiment of the present invention in a state where it can be loaded with coated sand;

[0042] Figure 3 for Figure 2 Enlarged view of section A;

[0043] Figure 4This is a front plan view of the first specific embodiment of the present invention in the unloading state;

[0044] Figure 5 This is a front plan view of the second specific embodiment of the present invention in a state where it can be loaded with coated sand;

[0045] Figure 6 This is a structural diagram of a single base plate;

[0046] Figure 7 This is a schematic diagram showing the cooperation relationship between the multiple base plates and the transfer bucket body of the present invention.

[0047] In the diagram: 1. Transfer bucket body; 2. Rocker arm; 3. Guide cylinder; 4. Support rod; 5. Base plate; 6. Collar; 11. Handle; 12. Fixing rod; 21. Mounting plate; 22. Locking hook; 41. Spring; 42. Boss; 43. Support platform; 44. Groove; 51. Sand-blocking cloth; 211. Wire rope one; 212. Wire rope two. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0049] like Figures 1 to 7 The image shows a first specific embodiment of the present invention.

[0050] As a preparation for the installation of this invention, several points need to be explained: First, the transfer bucket body 1 is pre-manufactured with multiple supports for rotating and installing the rocker arm 2, handle 11, and multiple base plates 5; Second, the mounting plate 21, locking hook 22 and rocker arm 2 are manufactured together, and the support rod 4, boss 42 and support platform 43 are manufactured together; Third, multiple base plates 5 are pre-installed on the corresponding supports on the transfer bucket body 1; Fourth, the sand-blocking cloth 51 is made of hemp fabric.

[0051] When installing this invention, multiple fixing rods 12 are welded to the inside of the transfer bucket body 1. Then, the guide cylinder 3 is welded together with the multiple fixing rods 12. The spring 41 is then installed to the bottom end of the guide cylinder 3 via a threaded connection. Next, the collar 6 is removed, and multiple steel wire ropes 212 are welded onto the collar 6. Then, the rocker arm 2 is removed, and multiple steel wire ropes 211 are welded to the bottom end of the mounting plate 21. The rocker arm 2 is then installed onto the corresponding support on the transfer bucket body 1. Next, the collar 6 is fitted onto the support rod 4, and the support rod 4 is inserted into the inside of the guide cylinder 3. During this process, the support rod 4 is simultaneously inserted into the spring 41. Then, the collar 6 is installed to the lower end of the spring 41 via a threaded connection. The multiple steel wire ropes 212 are then fixedly connected to the multiple base plates 5 via welding. Then, the multiple steel wire ropes 211 are welded onto the collar 6. Finally, multiple sand-blocking cloths 51 are installed onto the multiple base plates 5, thus completing the installation of this invention.

[0052] The working principle of this invention is as follows: When the invention needs to load coated sand, during the rotation of the rocker arm 2, multiple steel wire ropes 211 first pull the collar 6, causing the collar 6 to slide upward on the support rod 4. The support rod 4 remains in a fixed position due to the action of the spring 41 and gravity. At this time, through the action of multiple steel wire ropes 212, multiple base plates 5 rotate and gradually engage until the top of the collar 6 just contacts the bottom of the boss 42. At this time, the multiple base plates 5 are not completely engaged, and the multiple base plates 5 are still close to each other. When the height of the end near the center of the transfer bucket body 1 is higher than that of the support platform 43, if the power arm of the rocker arm 2 is pressed down, the collar 6 overcomes the elastic force of the spring 41 and pushes the support rod 4 upward by squeezing the boss 42 until the support platform 43 abuts against the end of the multiple bottom plates 5 near the center of the transfer bucket body 1. That is to say, at this time the support platform 43 provides support for the multiple bottom plates 5. If the rocker arm 2 is pressed down again, the multiple bottom plates 5 will cooperate and the handle 11 will be fastened to the locking hook 22. At this time, the present invention can be loaded with coated sand.

[0053] When the present invention unloads the material, the handle 11 is also removed from the locking hook 22. At this time, the multiple steel wire ropes 211 no longer provide upward tension to the collar 6, and the support rod 4 can no longer provide support force to the multiple base plates 5. Therefore, under the gravity of the coated sand, the multiple base plates 5 rotate downward to complete the unloading. During this process, the collar 6 falls downward and the support rod 4 also falls downward until the multiple base plates 5 fall to the lowest gravitational potential energy point.

[0054] When the equipment of the present invention is loaded with coated sand, the coated sand does not leak out of the equipment during the loading and transfer process. When the equipment of the present invention is unloading, multiple bottom plates 5 open at the same time, and the bottom of the cavity used to load the coated sand is fully opened. The total time until the coated sand in the equipment is completely unloaded is 2.4 seconds. Due to the large pores on the linen fabric, dust is generated outward from the part blocked by the sand-blocking cloth 51, but the dust completely dissipates when it flies to a distance of 2cm from the sand-blocking cloth 51.

[0055] like Figures 1 to 7 As shown, a second specific embodiment of the present invention is illustrated. Compared with the first specific embodiment of the present invention, the difference is that the support part adopts a groove 44 formed on the support rod 4, and the sand-blocking cloth 51 is made of plastic woven material.

[0056] When the equipment of the present invention is loaded with coated sand, the coated sand does not leak from the equipment to the outside during the loading and transfer process; when the equipment of the present invention is unloading, multiple bottom plates 5 open at the same time, and the bottom of the cavity used to load the coated sand is fully opened until the coated sand inside the equipment is completely unloaded. The total time is 2.4 seconds, and no dust is generated in the part affected by the sand-blocking cloth 51.

Claims

1. A coated sand transfer hopper, comprising: The transfer bucket body (1) and the bottom plate (5) are provided. The bottom plate (5) is installed at the bottom of the transfer bucket body (1), and the bottom plate (5) and the transfer bucket body (1) together form a cavity for loading coated sand. The feature is that it also includes a fast discharge mechanism. The bottom of the transfer bucket body (1) is provided with a fast discharge mechanism that cooperates with the bottom plate (5). When unloading, the fast discharge mechanism makes the bottom of the transfer bucket body (1) completely open, so that the coated sand in the transfer bucket body (1) is unloaded quickly. The fast material dropping mechanism includes a support installed at the top of the transfer bucket body (1), a rocker arm (2) installed on the support, a locking hook (22) provided on the rocker arm (2), a handle (11) that cooperates with the locking hook (22) installed on the transfer bucket body (1), an mounting plate (21) installed on the rocker arm (2), and multiple steel wire ropes (211) extending into the transfer bucket body (1) installed on the mounting plate (21). Multiple bottom plates (5) are provided at the bottom of the transfer bucket body (1), and the other ends of the multiple steel wire ropes (211) are respectively set on the multiple bottom plates (5). Between the multiple base plates (5), and between every two adjacent base plates (5), a sand-blocking cloth (51) is installed to block the flying of coated sand; The transfer bucket body (1) is provided with a guide cylinder (3) and a plurality of fixing rods (12) for fixing the guide cylinder (3). The opening of the guide cylinder (3) faces downward. The two ends of the plurality of fixing rods (12) are respectively connected to the outer side wall of the guide cylinder (3) and the inner side wall of the transfer bucket body (1). A support rod (4) is movably installed inside the guide cylinder (3). A support part for supporting a plurality of base plates (5) is installed at the bottom end of the support rod (4). A boss (42) is installed on the support rod (4). A collar (6) is sleeved on the support rod (4). The collar (6) is located below the boss (42). A plurality of steel wire ropes (211) are connected to the outside of the collar (6). A plurality of steel wire ropes (212) are installed on the collar (6). The other end of the plurality of steel wire ropes (212) is connected to a plurality of base plates (5).

2. The coated sand transfer hopper according to claim 1, characterized in that: The support part is a support platform (43).

3. The coated sand transfer hopper according to claim 1, characterized in that: The support portion is a groove (44) formed on the support rod (4).

4. The coated sand transfer hopper according to claim 1, characterized in that: A spring (41) is fixedly installed on the boss (42), and the other end of the spring (41) is fixedly connected to the bottom end of the guide cylinder (3).

5. A coated sand transfer hopper according to claim 1, characterized in that: The side edges of the base plate (5) are serrated, and the serrated edges between every two adjacent base plates (5) are mutually matched.

6. The coated sand transfer bucket according to claim 1, characterized in that: The guide cylinder (3) is cylindrical in shape.

7. A coated sand transfer hopper according to claim 1, characterized in that: The top of the guide tube (3) is closed.

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