Energy-saving foundry sand recycling equipment

Abstract

The invention relates to the technical field of foundry sand recycling, and discloses energy-saving foundry sand regeneration and recycling equipment which comprises a material box used for throwing recycled foundry sand. A driving mechanism; the powder pressing mechanism is used for crushing the foundry sand in the material box; the self-suction mechanism is used for automatically and quantitatively absorbing a water source to infiltrate the foundry sand in the material box; the driving mechanism comprises a motor, the output end of the motor is connected with a speed reducer, and an output shaft of the speed reducer is connected with the powder pressing mechanism through a self-suction mechanism. According to the energy-saving foundry sand regeneration and recovery equipment, through the arranged self-suction mechanism, a water source can be automatically sucked in a piston mode, introduced into the material box and subjected to powder crushing after soaking, the crushing effect and the crushing efficiency are higher, moving type automatic suction is directly adopted in the whole process, and therefore the automation effect of the recovery equipment is improved, and the energy-saving foundry sand regeneration and recovery equipment is suitable for popularization and application. Manual investment is reduced, and the situation that the humidity of foundry sand is too high due to uneven water quantity control caused by manual watering is avoided.

Description

Technical Field

[0001] This invention relates to the field of foundry sand recycling technology, specifically to an energy-saving foundry sand regeneration and recycling equipment. Background Technology

[0002] The foundry industry is a fundamental sector within manufacturing, and the development of various industries relies heavily on castings. From automobiles, machine tools, agricultural machinery, and metallurgical and mining equipment to aviation, aerospace, and defense industries, and even building hardware and household appliances, a large number of castings are required annually. The foundry industry is resource-intensive, consuming significant amounts of energy and various raw and auxiliary materials each year. Foundry sand is one of the most consumed auxiliary materials; it is used to create sand molds and cores during molding sand casting, and becomes used sand after pouring.

[0003] Currently, foundry sand often clumps during recycling, requiring dilution with water before crushing and filtration. Traditional methods involve crushing the sand and spraying water to regulate humidity after recycling. However, due to the loose nature of the sand clumps, most manufacturers rely on manual crushing and water spraying, resulting in low automation and inefficient sand recycling. Therefore, an energy-saving foundry sand regeneration and recycling equipment is proposed to address these issues. Summary of the Invention

[0004] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an energy-saving foundry sand recycling equipment, which solves the problem of low efficiency in the foundry sand recycling process in existing technologies.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: an energy-saving foundry sand recycling equipment, comprising a hopper for feeding recycled foundry sand; a drive mechanism; a powder pressing mechanism for crushing the foundry sand inside the hopper; and a self-priming mechanism for automatically and quantitatively absorbing water to wet the foundry sand in the hopper; the drive mechanism includes a motor, the output end of which is connected to a reducer, and the output shaft of the reducer is connected to the powder pressing mechanism through the self-priming mechanism; the self-priming mechanism includes a torsion component, a water suction component, and a self-control mechanism.

[0006] Preferably, the water-absorbing component includes a suction pipe, one end of which is connected to a water tank, and the other end of which is connected to a sleeve. A piston is slidably connected inside the sleeve, and a shaft is connected to the piston. A movable sleeve is connected to the right end of the shaft, and a crank is provided inside the movable sleeve. A support shaft is connected to the crank, and a worm gear is connected to the support shaft. A worm shaft meshes with the worm gear and is connected to the output end of a reducer. An extrusion pipe is connected to the sleeve and is connected to a material box.

[0007] Preferably, the powder pressing mechanism includes a crushing roller, a screen box is rotatably connected to the crushing roller, the screen box is connected below the material box, the crushing roller is connected to a torsion member, and a filter screen is provided inside the screen box below the crushing roller.

[0008] Preferably, the left end of the crushing roller is connected to a pulley one via a shaft, the pulley one is connected to a pulley two via a belt drive, a support shaft is connected to the shaft center of the pulley two, a cylindrical screen is fixedly installed on the support shaft, a discharge port is provided below the cylindrical screen, a slag discharge sleeve is connected to the side of the screen box, and the slag discharge sleeve abuts against the surface of the cylindrical screen.

[0009] Preferably, the torsion member includes a rotating plate, which is fixed on the worm shaft. A shaft sleeve is rotatably connected to the surface of the rotating plate. The shaft sleeve is connected to the crushing roller. A round shaft is fixedly connected inside the shaft sleeve, and a compression spring is sleeved on the surface of the round shaft.

[0010] Preferably, one end of the compression spring abuts against the rotating plate, and the other end of the compression spring abuts against the shaft sleeve. Two round shafts are provided, and two compression springs are respectively sleeved on the two round shafts.

[0011] Preferably, the self-control device includes a disc with a slot, one end of the crank rod is slidably connected in the slot, the other end of the crank rod is slidably connected in the inner groove of the movable sleeve, and two limiting pins are connected to the side of the disc, the limiting pins being slidably connected to the plate.

[0012] Preferably, the crank is slidably connected to the support shaft, and the disc is provided with a self-adjusting device for controlling the height of the disc; The self-adjusting device includes a first connecting rod and a second connecting rod, which are rotatably connected to each other. The other ends of the first connecting rod and the second connecting rod are rotatably connected to a rotating plate and a shaft sleeve, respectively. The rotation center points of the first connecting rod and the second connecting rod are connected to a collar through a connecting rod. A movable ring is rotatably connected to the surface of the collar. A sliding plate is fixedly connected to the movable ring. A movable frame is slidably connected to the surface of the sliding plate. The movable frame is connected to a disc.

[0013] Preferably, the slide plate is connected to two limiting rods, which are slidably connected to the material box.

[0014] Preferably, there are two of each of the first and second connecting rods, and the two connecting rods are arranged in a circular array with the center of the shaft sleeve as the axis of symmetry. The collar is connected to the rotation intersection of the two connecting rods.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides an energy-saving foundry sand recycling equipment, which has the following beneficial effects: 1. This energy-saving foundry sand recycling equipment uses a self-priming mechanism to automatically draw water into the material bin, where it is wetted and crushed to dilute the agglomerated foundry sand. The sand is then further crushed using a powder-pressing device, resulting in higher crushing efficiency and better overall performance. The entire process requires no manual watering; the automatic pumping improves automation, reduces manual labor, and avoids uneven water control and excessive moisture in the foundry sand caused by manual watering.

[0016] 2. This energy-saving foundry sand recycling equipment, through its self-control mechanism, can autonomously adjust the water pumping and wetting volume according to the torsional force of the powder pressing mechanism. When the foundry sand recycled inside the material box is too hard and has a large degree of agglomeration, the self-control mechanism will automatically control the water pumping volume, thereby further improving the foundry sand recycling efficiency and achieving energy-saving water injection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an energy-saving foundry sand recycling equipment proposed in this invention; Figure 2 This is a schematic diagram of the powder pressing mechanism of an energy-saving foundry sand recycling equipment proposed in this invention; Figure 3 This is a schematic diagram of the torsion component structure of an energy-saving foundry sand recycling equipment proposed in this invention; Figure 4 This is a schematic diagram of the self-priming mechanism of an energy-saving foundry sand regeneration and recycling equipment proposed in this invention; Figure 5 This is a schematic diagram of the disc connection structure of an energy-saving foundry sand recycling equipment proposed in this invention; Figure 6 This is a schematic diagram of the connection structure of the sliding plate in an energy-saving foundry sand recycling equipment proposed in this invention. Figure 7 This is a schematic diagram of the shaft collar connection structure of an energy-saving foundry sand regeneration and recycling equipment proposed in this invention.

[0018] In the diagram: 1. Material bin; 2. Screen box; 3. Motor; 4. Reducer; 5. Self-priming mechanism; 501. Worm shaft; 502. Rotating plate; 503. Shaft sleeve; 504. Round shaft; 505. Compression spring; 506. Pulling tube; 507. Sleeve; 508. Extrusion tube; 509. Piston; 510. Shaft; 511. Limiting rod; 512. Worm gear; 513. Support shaft; 514. Movable sleeve; 515. Crank rod; 516. 517. Disc; 518. Slot; 519. Plate; 520. Limit pin; 521. Moving frame; 522. Slide plate; 522. Self-adjusting device; 5221. Connecting rod one; 5222. Connecting rod two; 5223. Shaft collar; 5224. Moving ring; 6. Slag discharge sleeve; 7. Discharge port; 8. Powder pressing mechanism; 801. Crushing roller; 802. Filter screen; 803. Cylinder screen; 804. Support shaft; 805. Pulley one; 806. Pulley two. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-7 An energy-saving foundry sand recycling equipment includes a material bin 1 for feeding recycled foundry sand; a drive mechanism; a powder pressing mechanism 8 for crushing the foundry sand inside the material bin 1; and a self-priming mechanism 5 for automatically and quantitatively absorbing water to wet the foundry sand in the material bin 1. The drive mechanism includes a motor 3, the output end of which is connected to a reducer 4, and the output shaft of the reducer 4 is connected to the powder pressing mechanism 8 through the self-priming mechanism 5.

[0021] In this embodiment, the self-priming mechanism 5 includes a torsion member, a water-absorbing member, and a self-control member; the water-absorbing member includes a suction pipe 506, one end of which is connected to the water tank, and the other end of which is connected to a sleeve 507. A piston 509 is slidably connected inside the sleeve 507, and a shaft 510 is connected to the piston 509. A movable sleeve 514 is connected to the right end of the shaft 510. A crank 515 is provided inside the movable sleeve 514, and a support shaft 513 is connected to the crank 515. A worm gear 512 is connected to the support shaft 513, and a worm shaft 501 meshes with the worm gear 512. The worm shaft 501 is connected to the output end of the reducer 4, and an extrusion pipe 508 is connected to the sleeve 507. The extrusion pipe 508 is connected to the material box 1. When the worm shaft 501 rotates, it will synchronously drive the worm wheel 512 to mesh and rotate. The rotation of the worm wheel 512 will drive the crank rod 515 to rotate through the support shaft 513. The rotation of the crank rod 515 will drive the internal groove of the movable sleeve 514 to rotate, thereby driving the movable sleeve 514 and the shaft 510 to pull left and right in a cycle. Then the shaft 510 will drive the piston 509 to move inside the sleeve 507. When the piston 509 moves to the right, it will use negative pressure to draw water from the water pool into the sleeve 507 through the suction pipe 506. Then the piston 509 moves to the left, which will squeeze the water out from the extrusion pipe 508 and into the material box 1. The material box 1 has a row of water spray holes, so it will automatically draw water to wet the agglomerated casting sand inside the material box 1.

[0022] Furthermore, the powder pressing mechanism 8 includes a crushing roller 801, on which a screen box 2 is rotatably connected. The screen box 2 is connected below the material box 1. The crushing roller 801 is connected to a torsion member, and a filter screen 802 is installed inside the screen box 2 below the crushing roller 801. When the crushing roller 801 rotates, it rotates inside the material box 1, crushing and recovering the agglomerated foundry sand inside.

[0023] Furthermore, the left end of the crushing roller 801 is connected to a pulley 805 via a shaft, and the pulley 805 is connected to a pulley 806 via a belt drive. A support shaft 804 is connected to the shaft of the pulley 806, and a cylindrical screen 803 is fixedly installed on the support shaft 804. A discharge port 7 is provided below the cylindrical screen 803, and a slag discharge sleeve 6 is connected to the side of the screen box 2. The slag discharge sleeve 6 abuts against the surface of the cylindrical screen 803. When the crushing roller 801 rotates, it will also drive the pulley 805 to rotate. The belt drive will drive the screen 803 on the support shaft 804 to rotate. So at this time, the foundry sand crushed by the crushing roller 801 will enter the top of the screen 803 after being filtered by the filter screen 802. The rotation of the screen 803 is similar to the process of "sand turning", which tumbles the foundry sand for further screening. Some larger lumps that cannot be crushed or some metal blocks will not be able to penetrate the screen 803 to enter the discharge port 7. Instead, they will enter the slag discharge sleeve 6 with the rolling direction.

[0024] Furthermore, the torsion component includes a rotating plate 502, which is fixed to the worm shaft 501. A shaft sleeve 503 is rotatably connected to the surface of the rotating plate 502, and the shaft sleeve 503 is connected to the crushing roller 801. A round shaft 504 is fixedly connected inside the shaft sleeve 503, and a compression spring 505 is sleeved on the surface of the round shaft 504. Rotation of the worm shaft 501 synchronously drives the rotating plate 502 to rotate. The rotating plate 502 then rotates on the two round shafts 504, compressing multiple compression springs 505, which indirectly drives the rotation of the shaft sleeve 503. The shaft sleeve 503 then synchronously drives the rotation of the crushing roller 801, causing the crushing roller 801 to rotate inside the material box 1. Therefore, when the internal foundry sand agglomerates are hard, the pressure controlling the rotation of the entire rotating plate 502 will increase. This indirect transmission process provides a buffer during the rotation of the crushing roller 801.

[0025] In addition, one end of the compression spring 505 abuts against the rotating plate 502, and the other end of the compression spring 505 abuts against the shaft sleeve 503. Two round shafts 504 are provided, and two compression springs 505 are respectively sleeved on the two round shafts 504. The multiple compression springs 505 can provide a certain compression force, making the entire power transmission more stable.

[0026] It is worth noting that the self-control device includes a disc 516 with a slot 517. One end of the crank rod 515 is slidably connected to the slot 517, and the other end is slidably connected to the inner groove of the movable sleeve 514. Two limiting pins 519 are connected to the side of the disc 516 and are slidably connected to the plate 518. The crank rod 515 is slidably connected to the support shaft 513. The disc 516 is equipped with a self-adjusting device 522 to control the height of the disc 516. The disc 516 can limit the rotation position of the crank rod 515. When the support shaft 513 rotates, it will drive the crank rod 515 to rotate. Since one end of the crank rod 515 is limited by the slot 517, the entire eccentric distance is directly limited, thereby controlling the subsequent water injection volume.

[0027] It is worth noting that the self-adjusting device 522 includes a first connecting rod 5221 and a second connecting rod 5222. The first connecting rod 5221 and the second connecting rod 5222 are rotatably connected to each other. The other ends of the first connecting rod 5221 and the second connecting rod 5222 are respectively rotatably connected to the rotating plate 502 and the shaft sleeve 503. The rotation center points of the first connecting rod 5221 and the second connecting rod 5222 are connected to the collar 5223 through the connecting rod. The surface of the collar 5223 is rotatably connected to the movable ring 5224. The movable ring 5224 is fixedly connected to the sliding plate 521. The surface of the sliding plate 521 is slidably connected to the movable frame 520. The movable frame 520 is connected to the disc 516. Considering the water spray volume, because excessive water spraying would result in excessively moist recycled foundry sand, making it difficult to recover, while insufficient moisture would lead to incomplete crushing and excessive pressure on the crushing roller 801, a self-adjusting device 522 is installed to control the drainage volume based on the rotational pressure of the crushing roller 801. Specifically, when the hardness of the agglomerated foundry sand inside the material box 1 is high, the torque required for the rotating plate 502 to indirectly rotate the crushing roller 801 needs to be greater, thus increasing the compression of the compression spring 505. This creates a rotational angle difference between the rotating plate 502 and the shaft sleeve 503, which in turn causes the rotating plate 502 to simultaneously increase the opening angle of connecting rod 1 5221 and connecting rod 2 5222, controlling the shaft collar. The axial movement of 5223 drives the lateral movement of the movable ring 5224, which in turn drives the movement of the slide plate 521. By utilizing the sliding connection between the slide plate 521 and the moving frame 520, the moving frame 520 is lifted to a certain height by the triangular structure of the slide plate 521, which then drives the disc 516 to move upward. Therefore, the rotation radius of the crank rod 515 driven by the support shaft 513 will increase, which in turn indirectly increases the sliding stroke of the piston 509. As a result, the water injection volume during water immersion will increase. Thus, the whole system achieves integrated linkage, eliminating the need for operators to control the valves. The water injection volume is directly controlled by the pressure during crushing. Conversely, the eccentricity of the crank rod 515 decreases.

[0028] It is worth mentioning that two limiting rods 511 are connected to the slide plate 521. The limiting rods 511 are slidably connected to the material box 1. By setting the two limiting rods 511, the slide plate 521 can be restricted to moving only laterally. There are two connecting rods 5221 and 5222. The two connecting rods 5221 and 5222 are arranged in a circular array with the center of the shaft sleeve 503 as the axis of symmetry. The collar 5223 is connected to the rotation intersection of the two connecting rods 5221 and 5222. By setting two sets of connecting rods 5221 and 5222, the axial movement of the collar 5223 can be controlled more stably.

[0029] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.

[0030] The working principle is as follows: First, the recovered agglomerated foundry sand is fed into the material box 1. Then, the motor 3 is started, and through the internal gear transmission of the reducer 4, the worm shaft 501 is controlled to rotate. The rotation of the worm shaft 501 will synchronously drive the rotation of the rotating plate 502. Then, the rotating plate 502 rotates on two round shafts 504, squeezing multiple compression springs 505, which in turn indirectly drives the rotation of the shaft sleeve 503. The shaft sleeve 503 will then synchronously drive the rotation of the crushing roller 801. Therefore, the crushing roller 801 will rotate inside the material box 1 to crush the agglomerated foundry sand. Furthermore, the rotation of the crushing roller 801 will also drive the pulley 805. The rotation of the belt drives the rotating screen 803 on the support shaft 804. The foundry sand, after being crushed by the crushing roller 801 and filtered by the filter screen 802, enters the area above the screen 803. The rotation of the screen 803 is similar to the "sand turning" process, which tumbles the foundry sand for further screening. Some larger, unbreakable lumps or metal blocks cannot penetrate the screen 803 to enter the discharge port 7. Instead, they enter the slag discharge sleeve 6 along the rolling direction. The crushed and turned foundry sand then passes through the screen 803 and enters the discharge port 7 for self-discharge. The operator can then collect it, dry it again, and recycle it. Meanwhile, considering that the crushing process of a section of agglomerated foundry sand by the crushing roller 801 is time-consuming and prone to rolling continuously in the material box 1 without being crushed by the crushing roller 801, an automatic water pumping mechanism is set up to achieve crushing after wetting. When the worm shaft 501 rotates, it will synchronously drive the worm wheel 512 to mesh and rotate. The rotation of the worm wheel 512 will drive the crank rod 515 to rotate through the support shaft 513. The rotation of the crank rod 515 will drive the internal groove of the movable sleeve 514 to rotate, thereby driving the movable sleeve 514 and the shaft 510 to rotate left and right in a circular motion. After that, the shaft 510 will drive piston 509 to move inside sleeve 507. When piston 509 moves to the right, it will use negative pressure to draw water from the pool into sleeve 507 through suction pipe 506. Then piston 509 moves to the left, which will squeeze water out from extrusion pipe 508 and into material box 1. There is a row of water spray holes inside material box 1, so it will automatically draw water to wet the agglomerated foundry sand inside material box 1. Of course, one-way valves are installed inside suction pipe 506 and extrusion pipe 508 to prevent backflow caused by reciprocating movement of piston 509.Furthermore, the entire equipment takes into account the water spray volume. Excessive water spray will result in overly moist recycled foundry sand, making it difficult to recover. Insufficient moisture will lead to incomplete crushing, placing excessive pressure on the crushing roller 801. Therefore, a self-adjusting device 522 is installed to control the drainage volume based on the rotational pressure of the crushing roller 801. Specifically, when the hardness of the agglomerated foundry sand inside the material box 1 is high, the torque required for the rotating plate 502 to indirectly rotate the crushing roller 801 needs to be greater. This increases the pressure on the compression spring 505, creating a rotational angle difference between the rotating plate 502 and the shaft sleeve 503. The rotating plate 502 then simultaneously increases the opening angle of connecting rods 5221 and 5222. After the opening of connecting rods 5221 and 5222, the axial movement of the shaft collar 5223 is controlled, which in turn drives the lateral movement of the movable ring 5224. The lateral movement of the movable ring 5224 then simultaneously drives the movement of the sliding plate 521. The sliding connection between the sliding plate 521 and the moving frame 520 causes the sliding plate 521 to lift the moving frame 520 to a certain height, which in turn causes the disc 516 to move upward. The disc 516, through the slot 517, causes the crank 515 to slide inside the support shaft 513, while the other end of the crank 515 still slides inside the movable sleeve 514. Therefore, the rotation radius of the crank 515 driven by the support shaft 513 increases, which indirectly increases the sliding stroke of the piston 509. As a result, the water injection volume increases during water immersion. Thus, the whole system achieves integrated linkage, eliminating the need for operators to control valves. The water injection volume is directly controlled by the pressure during crushing. Conversely, because the eccentricity of the crank 515 decreases, the movement of the piston 509 is very small, indicating that the hardness or amount of casting sand agglomerates inside the material box 1 is small, so the water injection can be very small, ultimately achieving autonomous energy-saving recycling.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. An energy-saving foundry sand recycling equipment, characterized in that, include: Material bin (1), used for discharging recycled foundry sand; Drive mechanism; The powder pressing mechanism (8) is used to crush the foundry sand inside the hopper (1); The self-priming mechanism (5) is used to automatically and quantitatively absorb water to wet the foundry sand in the hopper (1); The driving mechanism includes a motor (3), the output end of which is connected to a reducer (4), and the output shaft of the reducer (4) is connected to the powder pressing mechanism (8) through a self-priming mechanism (5); The self-priming mechanism (5) includes a torsion member, a water-absorbing member, and a self-control mechanism; The water-absorbing component includes a suction pipe (506), one end of which is connected to the water tank, and the other end of which is connected to a sleeve (507). A piston (509) is slidably connected inside the sleeve (507), and a shaft (510) is connected to the piston (509). A movable sleeve (514) is connected to the right end of the shaft (510). A crank rod (515) is provided inside the movable sleeve (514), and a support shaft (513) is connected to the crank rod (515). A worm gear (512) is connected to the support shaft (513), and a worm shaft (501) meshes with the worm gear (512). The worm shaft (501) is connected to the output end of the reducer (4). An extrusion pipe (508) is connected to the sleeve (507), and the extrusion pipe (508) is connected to the material box (1).

2. The energy-saving foundry sand recycling equipment according to claim 1, characterized in that: The powder pressing mechanism (8) includes a crushing roller (801), a screen box (2) is rotatably connected to the crushing roller (801), the screen box (2) is connected below the material box (1), the crushing roller (801) is connected to a torsion member, and a filter screen (802) is provided inside the screen box (2) below the crushing roller (801).

3. The energy-saving foundry sand recycling equipment according to claim 2, characterized in that: The left end of the crushing roller (801) is connected to a pulley (805) via a shaft. The pulley (805) is connected to a pulley (806) via a belt drive. A support shaft (804) is connected to the shaft of the pulley (806). A cylindrical screen (803) is fixedly installed on the support shaft (804). A discharge port (7) is provided below the cylindrical screen (803). A slag discharge sleeve (6) is connected to the side of the screen box (2). The slag discharge sleeve (6) abuts against the surface of the cylindrical screen (803).

4. The energy-saving foundry sand recycling equipment according to claim 3, characterized in that: The torsion member includes a rotating plate (502), which is fixed on the worm shaft (501). A shaft sleeve (503) is rotatably connected to the surface of the rotating plate (502). The shaft sleeve (503) is connected to the crushing roller (801). A round shaft (504) is fixedly connected inside the shaft sleeve (503). A compression spring (505) is sleeved on the surface of the round shaft (504).

5. The energy-saving foundry sand recycling equipment according to claim 4, characterized in that: One end of the compression spring (505) abuts against the rotating plate (502), and the other end of the compression spring (505) abuts against the shaft sleeve (503). There are two round shafts (504), and two compression springs (505) are respectively sleeved on the two round shafts (504).

6. The energy-saving foundry sand recycling equipment according to claim 5, characterized in that: The self-control device includes a disc (516) with a slot (517) on it. One end of the crank rod (515) is slidably connected in the slot (517), and the other end of the crank rod (515) is slidably connected in the inner groove of the movable sleeve (514). Two limiting pins (519) are connected to the side of the disc (516), and the limiting pins (519) are slidably connected to the plate (518).

7. The energy-saving foundry sand recycling equipment according to claim 6, characterized in that: The crank (515) is slidably connected to the support shaft (513), and the disc (516) is provided with a self-adjusting device (522) for controlling the height of the disc (516); The self-adjusting device (522) includes a first connecting rod (5221) and a second connecting rod (5222), which are rotatably connected to each other. The other ends of the first connecting rod (5221) and the second connecting rod (5222) are rotatably connected to a rotating plate (502) and a shaft sleeve (503), respectively. The rotation center points of the first connecting rod (5221) and the second connecting rod (5222) are connected to a collar (5223) through a connecting rod. A movable ring (5224) is rotatably connected to the surface of the collar (5223). A sliding plate (521) is fixedly connected to the movable ring (5224). A movable frame (520) is slidably connected to the surface of the sliding plate (521). The movable frame (520) is connected to a disc (516).

8. The energy-saving foundry sand recycling equipment according to claim 7, characterized in that: Two limiting rods (511) are connected to the slide plate (521), and the limiting rods (511) are slidably connected to the material box (1).

9. The energy-saving foundry sand recycling equipment according to claim 8, characterized in that: There are two of each of the connecting rods 1 (5221) and 2 (5222), and both connecting rods 1 (5221) and 2 (5222) are arranged in a circular array with the center of the shaft sleeve (503) as the axis of symmetry. The collar (5223) is connected to the rotation intersection of the two connecting rods 1 (5221) and 2 (5222).

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