Molding sand recovery equipment for casting

Abstract

The invention discloses molding sand recovery equipment for casting, and belongs to the technical field of casting auxiliary machinery. Comprising a machine base, a machine shell assembly, a rotor crushing mechanism arranged in a machine shell and a screen assembly located below a rotor. The screen mesh assembly is formed by butting two groups of movable screen meshes; an elastic supporting unit is arranged between the machine shell and the screen, and the two sides of the screen are connected with separating assemblies used for driving the screen to move horizontally. According to the molding sand recycling equipment for casting, an elastic buffering stroke in the vertical direction is given to the screen through the elastic supporting unit, and when the screen is impacted by hard metal impurities or accumulated iron is too heavy, the screen generates yielding displacement to avoid rigid damage; and meanwhile, the separating assembly is used for driving the two sets of screens to be relatively separated in the horizontal direction, and impurities left on the surfaces of the screens are rapidly discharged without disassembling the machine. The problems that a screen of existing equipment is prone to being damaged, and accumulated iron is difficult to clean are effectively solved, and the automatic overload protection and anti-blocking functions are achieved.

Description

Technical Field

[0001] This invention relates to the field of casting auxiliary machinery technology, and in particular to a molding sand recycling device for casting. Background Technology

[0002] In the production process of the mechanical casting industry, molding and pouring processes generate a large amount of waste molding sand. To implement the concept of green casting, conserve resources, and reduce production costs, this waste molding sand typically needs to be recycled, crushed, and regenerated for reuse. Currently, the most widely used molding sand recycling equipment is the hammer crusher. The working principle of this type of equipment is mainly based on a motor driving a rotor to rotate at high speed within the crushing chamber. The hammer plates or hammerheads on the rotor violently impact and shear the agglomerated molding sand entering the crushing chamber. The crushed sand is discharged through the arc-shaped screen at the bottom, while larger particles that fail to pass through the screen remain in the chamber for secondary crushing until the particle size meets the requirements.

[0003] However, in practical applications, it has been found that existing hammer crusher structures have significant defects when processing foundry waste sand. Due to the characteristics of the source of foundry waste sand, it inevitably contains iron pellets, sprue flash, iron nails, or cooled metal slag generated during the casting process. To ensure that the recovered molding sand has a fine and uniform particle size, the working gap between the crusher hammer and the bottom screen of existing equipment is usually designed to be very small, and the screen aperture is fixed. When the above-mentioned hard metal impurities enter the crushing chamber with the sand clumps, larger-sized hard metal objects cannot pass through the screen apertures and will remain and accumulate on the screen surface for a long time. Because the crushing chamber is in a closed state, it is difficult for operators to detect these internally accumulated metal impurities in time, resulting in excessive accumulation of impurities that cannot be cleaned and discharged in time. Under the drive of the high-speed rotating hammer, these hard metal objects that cannot be discharged will continuously and violently collide and rigidly compress with the hammer and screen, which will not only rapidly wear down the hammer, but also cause the bottom screen to be unable to withstand the huge local concentrated stress, resulting in tearing, perforation, or deformation.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] This invention provides a molding sand recycling device for foundry to solve the technical problem that screens are easily damaged by the compression of hard metal objects.

[0006] The present invention adopts the following technical solution: a molding sand recycling device for foundry. It includes a base and a housing assembly fixed on the base, and a rotor crushing mechanism disposed within the housing assembly. The housing assembly includes a lower housing and an upper housing. A screen assembly, located below the rotor crushing mechanism, includes two sets of movable screens that can be joined to form a crushing and screening surface. An elastic support unit, disposed between the housing assembly and the screens, is used to support the screens and provide them with a vertical elastic buffer stroke to generate a yielding displacement when impacted by hard objects. A separation assembly, connected to the screens, is used to drive the two sets of screens to separate or close relative to each other in the horizontal direction to discharge debris retained on the screen surface.

[0007] Furthermore, the elastic support unit includes a fixed support foot disposed on the inner wall of the lower housing, a sealing sleeve fixed to one end of the fixed support foot, and a support shaft that slides into the sealing sleeve; a relief spring is provided inside the sealing sleeve, and one end of the support shaft that extends into the sealing sleeve has a step, with the relief spring connecting the step and the sealing sleeve; an arc-shaped support member is fixed to the top of the support shaft, and the arc-shaped support member has a limiting side extending upward along its arc length direction, the limiting side being adapted to abut against the side edge of the screen to limit the screen; The elastic support unit is symmetrically arranged corresponding to two sets of screens. The two sets of arc-shaped support members can be connected and spliced ​​together in the working state to form a complete arc-shaped support for the bottom of the screen. The bottom end face of the step is provided with a pressure sensor, and in the initial state, there is a gap between the bottom end face of the step and the bottom surface of the inner wall of the sealing sleeve. The pressure sensor is used to detect the weight of the debris accumulated on the screen and is adapted to contact the bottom surface of the inner wall of the sealing sleeve to generate a sensing signal when the weight of the accumulated debris is large enough to make the support shaft move down against the spring force.

[0008] Furthermore, connecting lugs are fixed to both sides of the screen near the bottom, and a waist groove is provided on the side wall of the lower housing; the separation assembly includes a tightening member that passes through the waist groove from the outside of the lower housing and is fixedly connected to the connecting lugs; the diameter of the rod of the tightening member is smaller than the vertical aperture of the waist groove, so that the connecting lugs and the screen can be vertically buffered within the range defined by the waist groove.

[0009] Furthermore, the separation assembly also includes a contact bushing fitted and fixed to one end of the tightening member located outside the lower housing; the contact bushing has a spool-like structure that is large at both ends and small in the middle, and both axial edges are integrally provided with radially protruding limiting edges to form an annular drive groove between the two limiting edges; the tightening member acts as a connector to lock the connecting lug to the contact bushing, so that the screen can move laterally synchronously with the contact bushing.

[0010] Furthermore, the separation assembly also includes a drive shaft and a cam driven by the drive shaft; the profile surface of the cam is accommodated in the drive groove of the contact sleeve and is always in contact with or adapted to abut against the outer circumferential surface of the contact sleeve; in the initial state, the cam blocks one side of the contact sleeve to maintain the docking closure of the two sets of screens; when the drive shaft rotates in the opposite direction, the cam pushes the contact sleeve to move laterally, thereby driving the two sets of screens to separate outward through the tightening member.

[0011] Furthermore, a bevel gear one is fixed on the drive shaft, and a bevel gear two that meshes with the bevel gear one is coaxially connected to the cam; the separation assembly also includes a sealing box fixed to the side of the lower housing and covering the waist groove, and the contact bushing and the cam are both housed in the sealing box to prevent crushed dust from being discharged from the waist groove.

[0012] Furthermore, a drive box is provided on one side of the lower housing, and the drive box is fixed to the side of the sealed box; the drive shaft, bevel gear one, and bevel gear two meshing with bevel gear one are all housed in the drive box; the drive shaft is transversely passed through the bearing and installed in the drive box, and a rotating disk is fixed to one end of the drive shaft that passes through the drive box; the drive box is provided with a scale that is coaxial with the drive shaft but does not contact it, and the rotating disk is provided with a pointer that works in conjunction with the scale to indicate the rotation angle of the drive shaft and the degree of separation of the screen.

[0013] Furthermore, the upper housing is hinged to the upper side of the lower housing via a hinge joint to enable opening for maintenance; the top of the upper housing is integrally connected to a feed hopper, and a cover plate is movably installed at the top opening of the feed hopper.

[0014] Furthermore, the rotor crushing mechanism includes a drive shaft that passes laterally through the lower housing and is supported by a main bearing seat, a hammer disc fixedly mounted on the drive shaft, hammer shafts distributed circumferentially on the hammer disc, and hammer heads sleeved on the hammer shafts; the hammer heads are located within the semi-cylindrical crushing space formed by the two sets of screens.

[0015] Furthermore, it also includes a drive motor mounted on the base and a pulley assembly connecting the drive motor and the transmission spindle; the base is a frame structure, and the bottom of the lower housing extends in a funnel shape into the frame of the base; the drive box is located on the side of the lower housing away from the pulley assembly.

[0016] The above-mentioned at least one technical solution adopted in this invention can achieve the following beneficial effects: A foundry sand recycling device effectively solves the technical problem of existing hammer crushers when processing foundry waste sand containing hard metal impurities such as iron filings and gating flash. This is because larger metal objects cannot pass through the screen holes and accumulate for a long time. Under the high-speed rotation of the hammers, these objects undergo continuous and violent collisions and rigid compression with the screen, leading to tearing, perforation, or deformation of the screen due to localized stress concentration. The invention utilizes an elastic support unit to provide two sets of... The vertical elastic buffer stroke of the movable screen allows for instantaneous retraction when hard metal debris impacts or squeezes the screen as it enters the crushing chamber with the sand. This transforms the traditional rigid "hard-on-hard" impact into a flexible elastic buffer, effectively absorbing impact energy and eliminating rigid compressive stress, thereby extending the service life of the screen and hammers. Simultaneously, the separation component drives the two sets of screens to separate horizontally, opening the bottom channel without disassembling the machine to quickly discharge debris stuck on the screen surface. This solves the problem of difficult-to-clean debris accumulation in the closed chamber, improving the equipment's maintenance efficiency and operational stability. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0018] In the attached diagram: Figure 1 This is an overall schematic diagram of a molding sand recycling device for foundry in this application; Figure 2 for Figure 1 A partial structural diagram; Figure 3 for Figure 2 A partial structural diagram; Figure 4 for Figure 1 A partial structural diagram; Figure 5 for Figure 1 A partial structural diagram; Figure 6 for Figure 5 Enlarged view of point B; Figure 7 for Figure 5 A partial structural diagram; Figure label: 1. Machine base; 2. Machine housing assembly; 201. Waist groove; 21. Lower machine housing; 22. Upper machine housing; 23. Hinge; 24. Feed hopper; 25. Cover plate; 26. Drive motor; 27. Pulley assembly; 28. Transmission main shaft; 29. ​​Main bearing seat; 210. Hammer disc; 211. Hammer shaft; 212. Hammer head; 3. Screen assembly; 31. Fixed support foot; 32. Sealing sleeve; 33. Support shaft; 34. Arc-shaped support; 35. Screen; 36. Relief spring; 37. Connecting lug; 4. Separation assembly; 41. Tightening component; 42. Contact bushing; 43. Sealing box; 44. Drive box; 45. Drive shaft; 451. Rotating disc; 46. Bevel gear one; 47. Bevel gear two; 48. Cam; 49. Dial. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] like Figure 1 , Figure 2 and Figure 5 As shown, the molding sand recycling equipment for casting described in this embodiment mainly consists of a base 1, a housing assembly 2, a rotor crushing mechanism, a screen assembly 3, and a separation assembly 4.

[0022] A housing assembly 2 is bolted to the top plane of the base 1. The housing assembly 2 includes a lower housing 21 located below and an upper housing 22 located above. The upper housing 22 is hinged to the upper side of the lower housing 21 via a hinge 23. During maintenance, the upper housing 22 can be flipped open around the hinge 23 to expose its interior. A feed hopper 24 is integrally welded to the top of the upper housing 22. The feed hopper 24 is funnel-shaped to guide materials. A cover plate 25 is movably mounted at the top opening of the feed hopper 24 via a pin to prevent internal sand and gravel from splashing and injuring people during crushing.

[0023] like Figures 1-4 As shown, a rotor crushing mechanism is provided in the internal cavity of the housing assembly 2. A shaft hole is reserved on the side wall of the lower housing 21, through which a transmission main shaft 28 is transversely inserted. A pair of main bearing seats 29 (containing self-aligning roller bearings) are fixedly installed on the outside of both sides of the lower housing 21. The two ends of the transmission main shaft 28 are rotatably supported on the main bearing seats 29 to withstand the radial load during high-speed rotation.

[0024] On a section of the drive shaft 28 located inside the housing, several hammer discs 210 are fixedly connected and fixed along its axial direction via keys. Several hammer shafts 211 are evenly distributed circumferentially between the hammer discs 210; hammer heads 212 are fitted onto the hammer shafts 211 and between two adjacent hammer discs 210 with gaps. This structure utilizes multiple sets of hammer discs 210 to "clamp" the hammer heads 212 in the middle. Under centrifugal force, the hammer heads 212 open radially to impact and crush the molding sand. When encountering excessively hard materials, the hammer heads 212 can rotate around the hammer shafts 211 to avoid them, providing primary protection.

[0025] To provide crushing power, a drive motor 26 is fixedly mounted on the top plane of the base 1 and on one side of the lower housing 21 (left side of the figure) via a motor mount. A pulley assembly 27 is provided between the output shaft of the drive motor 26 and the same-side end of the transmission main shaft 28. This assembly includes a driving pulley fixed to the output shaft of the drive motor 26, a driven pulley fixed to the corresponding end of the transmission main shaft 28, and a transmission belt connecting the two. During operation, the drive motor 26 drives the transmission main shaft 28 to rotate at high speed on the main bearing housing 29 via the pulley assembly 27.

[0026] like Figures 3-7 As shown, a screen assembly 3 is provided directly below the rotor crushing mechanism. The screen assembly 3 includes two sets of semi-circular movable screens 35 (usually made of high wear-resistant manganese steel). The two sets of screens 35 are arranged symmetrically. When the two sets of screens 35 are closed, a complete semi-cylindrical crushing and screening surface is formed.

[0027] To prevent damage to the screen from hard objects and to promptly detect internal iron buildup, an intelligent elastic support unit is designed between the lower casing 21 and the screen 35. The specific structure and principle are as follows: Fixed support feet 31 are symmetrically welded and fixed on both sides of the inner wall of the lower housing 21. A sealing sleeve 32 is vertically installed on each fixed support foot 31 via threads or flanges. A support shaft 33 slides vertically through the inside of the sealing sleeve 32, with a clearance fit between them. At the end of the support shaft 33 located inside the sealing sleeve 32, a stepped structure with an enlarged diameter is machined. A high-stiffness relief spring 36 is assembled inside the sealing sleeve 32. The lower end of the relief spring 36 is connected to the upper surface of the step of the support shaft 33, and the upper end is connected to the top of the inner wall of the sealing sleeve 32, thereby giving the support shaft 33 an upward elastic support force at all times.

[0028] An arc-shaped support member 34 is welded and fixed to the top of the support shaft 33. This arc-shaped support member 34 has a flange extending upwards along its arc length, i.e., a limiting side. This side tightly abuts against the outer edge of the screen 35 to prevent the screen from shifting left and right. Elastic support units are symmetrically arranged corresponding to the two sets of screens 35. When the equipment is in operation, the opposing arc-shaped support members 34 on both sides meet at the bottom, thus forming a complete and continuous semi-circular arc-shaped support, providing support and limiting for the bottom of the two sets of screens 35 near the sides.

[0029] A pressure sensor (not shown in the figure) is embedded or attached to the bottom end face of the step of the support shaft 33. In the initial state (i.e., when unloaded or during normal crushing of molding sand), the relief spring 36 is in a pre-compression equilibrium state. At this time, a set safety distance is reserved between the bottom end face of the step (i.e., the contact surface of the pressure sensor) and the bottom surface of the inner wall of the sealing sleeve 32. Within this distance, the pressure sensor is suspended and does not generate an electrical signal.

[0030] When uncrushable metal debris (such as iron filings, burrs, etc.) accumulates on the surface of screen 35, unable to pass through the sieve holes, the static load on screen 35 gradually increases. When the weight of the accumulated debris exceeds a set threshold, screen 35 presses against the support shaft 33, overcoming the elastic force of the relief spring 36 and continuing to move downwards. Once the downward movement of the support shaft 33 reaches the preset safety distance (i.e., eliminating the gap), the pressure sensor at the bottom of the step contacts and is pressed against the inner wall bottom surface of the sealing sleeve 32. At this time, the pressure sensor generates a sensing signal and transmits it to the control circuit, activating the audible alarm (e.g., a buzzer or high-decibel alarm horn installed on the distribution box) electrically connected to the pressure sensor. The audible alarm then emits a continuous or intermittent alarm sound, visually reminding on-site personnel that the iron accumulation inside screen 35 has exceeded the standard and the separation component 4 needs to be activated immediately to separate and remove slag from screen 35.

[0031] Connecting lugs 37 are welded to the bottom edges of both sets of screens 35 near the bottom. A vertically elongated groove 201 is formed on the corresponding side wall of the lower housing 21. A tightening member 41 is threaded onto the connecting lugs 37, passing through the groove 201 from the outside. The diameter of the portion of the tightening member 41 passing through the groove 201 is significantly smaller than the vertical aperture of the groove 201. This ensures that when the support shaft 33 performs the aforementioned "vertical buffering" or "downward detection," the connecting structure can float freely within the groove 201 without mechanical interference or jamming. A contact bushing 42 is fixedly fitted onto one end of the tightening member 41 located outside the housing 1. The contact bushing 42 is spool-shaped, with a central recess and radially protruding limiting flanges on both sides, forming a drive groove. Sealing boxes 43 are installed on both sides of the lower housing 21, completely covering the waist groove 201 to prevent dust leakage. The sealing boxes 43 house the contact bushing 42 and its mating cam 48. A drive box 44 is fixed to the outer side of the sealing boxes 43, away from the pulley assembly 27. A drive shaft 45 is horizontally inserted through the drive box 44 via bearings. A bevel gear 46 is fixed inside the drive box 44 and on the drive shaft 45. A second bevel gear 47 meshes with it, arranged vertically, with its shaft extending into the sealing box 43 and coaxially fixedly connected to the cam 48. In operation, the high point (long diameter end) of the cam 48 abuts against the outside of the contact sleeve 42, pressing the two sets of screens 35 inward to maintain a closed connection. When slag separation is required, the drive shaft 45 is rotated, driving the cam 48 to rotate via a bevel gear reversal transmission. The high point of the cam 48 rotates away in the opposite direction, pushing the contact sleeve 42 outward. The contact sleeve 42, through the tightening member 41, pulls the two sets of screens 35 to separate horizontally to both sides. Simultaneously, a scale 49 is provided on the outer wall of the drive box 44, and a rotating disk 451 and pointer are provided at the end of the drive shaft 45, allowing the operator to precisely control the rotation angle of the drive shaft 45.

[0032] It should be noted that, as another preferred embodiment of this application, in order to further improve the automation level of the equipment, the above-mentioned manual drive structure can be upgraded to an electrically controlled drive structure. The specific improvements are as follows: the rotating disk 451 fixed to the end of the drive shaft 45 is removed, and one end of the drive shaft 45 passing through the drive box 44 is directly connected to the drive component (e.g., a servo motor, stepper motor, or geared motor). Simultaneously, a PLC controller is added to the equipment. The pressure sensor at the bottom of the step, the drive component, and the drive motor 26 are all electrically connected to the PLC controller, forming a closed-loop control system.

[0033] When the pressure sensor detects that the weight of the accumulated iron on the screen 35 has reached the set threshold and sends a sensing signal, the PLC controller receives the signal and executes the following linkage program: First, it controls the drive motor 26 to stop running, so that the rotor crushing mechanism stops working to prevent danger or material splashing during the screen separation process; after the main unit stops, the PLC controller controls the drive component to start, driving the drive shaft 45 to rotate; the drive shaft 45 drives the two sets of screens 35 to separate to both sides through the cam 48, discharging the debris; after the slag is discharged, the drive component rotates in the opposite direction, so that the screens 35 automatically close and reset, and then the PLC controller restarts the drive motor 26 to resume normal crushing operation.

[0034] Working Principle: When the equipment starts, the drive motor 26 is powered on and runs, driving the transmission main shaft 28 to rotate at high speed on the main bearing seat 29 via the pulley assembly 27. At this time, the hammer disc 210 located inside the lower casing 21 drives the circumferentially distributed hammers 212 to generate huge centrifugal force and open radially, forming a high-speed rotating crushing hammer zone. Foundry waste sand is fed into the crushing chamber through the feed hopper 24 at the top of the upper casing 22 and guided into the crushing chamber through the funnel. The high-speed rotating hammers 212 perform high-frequency impact, shearing, and grinding on the incoming molding sand, breaking the clumps of molding sand into loose sand. The qualified loose sand after crushing passes through the bottom screen 35 and is discharged from the machine, completing the crushing process for molding sand recovery. During this process, the two sets of screens 35 remain closed under the pushing action of the cam 48, and the arc-shaped support 34 provides bottom support for the screens 35, ensuring uniform crushing particle size.

[0035] During the crushing process, if hard metal debris such as iron filings or nails mixed in the molding sand impacts the screen 35 instantly, the screen 35 will force the support shaft 33 to move downward slightly and compress the relief spring 36, using elastic displacement to "absorb" the impact kinetic energy and avoid damage to the screen's rigidity. When unbreakable metal debris gradually accumulates on the surface of the screen 35, causing an increase in weight, the static load on the screen 35 increases, forcing the support shaft 33 to continuously overcome the spring force and move downward. Once the weight of the accumulated metal exceeds a set threshold, the support shaft 33 moves downward, eliminating the preset safety distance, causing the pressure sensor at the bottom of the step to contact the inner wall of the sealing sleeve 32 and be compressed. The sensor immediately sends an electrical signal, triggering an audible alarm to alert for manual cleaning; or in automated mode, this signal is transmitted to the PLC controller, and the system automatically cuts off the power to the drive motor 26, achieving overload shutdown protection and preventing the equipment from operating with defects.

[0036] When an alarm signal is received or the PLC executes the automatic slag discharge program, the rotor crushing mechanism is first ensured to stop operating. Then, the drive shaft 45 is rotated manually or by a PLC-controlled drive component (such as a servo motor). The drive shaft 45, via a bevel gear set, drives the cam 48 located within the sealed box 43. The cam 48 pushes the contact sleeve 42 to move horizontally outwards, pulling the two sets of screens 35 horizontally to both sides through the tightening member 41, opening the slag discharge opening at the bottom. Metal debris retained on the screen surface is quickly discharged under gravity. After slag discharge, the drive shaft 45 is reversed, the cam 48 resets, and the contact sleeve 42 is tightened inwards again, causing the two sets of screens 35 to re-close and rejoin, restoring the equipment to standby or operating status.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A molding sand recycling device for foundry, characterized in that: The device includes a base (1) and a housing assembly (2) fixed on the base (1), and a rotor crushing mechanism disposed within the housing assembly (2). The housing assembly (2) includes a lower housing (21) and an upper housing (22). A screen assembly (3) is located below the rotor crushing mechanism and includes two sets of movable screens (35) that can be joined to form a crushing and screening surface. An elastic support unit is disposed between the housing assembly (2) and the screens (35) to support the screens (35) and provide the screens (35) with an elastic buffer stroke in the vertical direction so as to generate a yielding displacement when impacted by hard objects. A separation assembly (4) is connected to the screens (35) and is used to drive the two sets of screens (35) to separate or close relative to each other in the horizontal direction so as to discharge the debris stuck on the surface of the screens (35).

2. The foundry sand recycling equipment according to claim 1, characterized in that: The elastic support unit includes a fixed support leg (31) disposed on the inner wall of the lower housing (21), a sealing sleeve (32) fixed to one end of the fixed support leg (31), and a support shaft (33) that slides into the sealing sleeve (32); the sealing sleeve (32) is provided with a relief spring (36), and the end of the support shaft (33) that extends into the sealing sleeve (32) has a step, and the relief spring (36) is connected between the step and the sealing sleeve (32); an arc-shaped support member (34) is fixed to the top of the support shaft (33), and the arc-shaped support member (34) has a limiting side extending upward along its arc length direction, and the limiting side is adapted to abut against the side edge of the screen (35) to limit the screen (35); The elastic support unit is symmetrically arranged corresponding to two sets of screens (35). The two sets of arc-shaped support members (34) can be connected and spliced ​​together in the working state, thus forming a complete arc-shaped support for the bottom of the screen (35). The bottom end face of the step is provided with a pressure sensor, and in the initial state, there is a gap between the bottom end face of the step and the bottom surface of the inner wall of the sealing sleeve (32). The pressure sensor is used to detect the weight of the debris accumulated on the screen (35), and is suitable for contacting the bottom surface of the inner wall of the sealing sleeve (32) to generate a sensing signal when the weight of the accumulated debris is large enough to make the support shaft (33) move down against the spring force.

3. A foundry sand recycling device according to claim 1 or 2, characterized in that: The screen (35) has connecting lugs (37) fixed on both sides near the bottom. The side wall of the lower housing (21) has a waist groove (201). The separation component (4) includes a tightening member (41) that passes through the waist groove (201) from the outside of the lower housing (21) and is fixedly connected to the connecting lugs (37). The diameter of the rod of the tightening member (41) is smaller than the vertical aperture of the waist groove (201), so that the connecting lugs (37) and the screen (35) can make vertical buffer displacement within the range defined by the waist groove (201).

4. The foundry sand recycling equipment according to claim 3, characterized in that: The separation assembly (4) further includes a contact bushing (42) sleeved and fixed on one end of the tightening member (41) located outside the lower housing (21); the contact bushing (42) has a spool-like structure with large ends and small middle, and both axial sides are integrally provided with radially protruding limiting edges to form an annular drive groove between the two limiting edges; the tightening member (41) acts as a connector to lock the connecting lug (37) and the contact bushing (42), so that the screen (35) can move laterally synchronously with the contact bushing (42).

5. A foundry sand recycling device according to claim 4, characterized in that: The separation assembly (4) also includes a drive shaft (45) and a cam (48) driven by the drive shaft (45); the profile of the cam (48) is accommodated in the drive slot of the contact sleeve (42) and is always in contact with or adapted to abut against the outer circumferential surface of the contact sleeve (42); in the initial state, the cam (48) blocks one side of the contact sleeve (42) to maintain the docking closure of the two sets of screens (35); when the drive shaft (45) rotates in the opposite direction, the cam (48) pushes the contact sleeve (42) to move laterally, and then drives the two sets of screens (35) to separate outward through the tightening member (41).

6. The foundry sand recycling equipment according to claim 5, characterized in that: A bevel gear one (46) is fixed on the drive shaft (45), and a bevel gear two (47) that meshes with the bevel gear one (46) is coaxially connected to the cam (48); the separation assembly (4) also includes a sealing box (43) fixed on the side of the lower housing (21) and covering the waist groove (201), and the contact bushing (42) and the cam (48) are both housed in the sealing box (43) to prevent crushed dust from being discharged from the waist groove (201).

7. A foundry sand recycling device according to claim 6, characterized in that: A drive box (44) is provided on one side of the lower housing (21), and the drive box (44) is fixed to the side of the sealed box (43). The drive shaft (45), bevel gear one (46) and bevel gear two (47) meshing with bevel gear one (46) are all housed in the drive box (44). The drive shaft (45) passes through the bearing in the drive box (44) laterally. A rotating disk (451) is fixed at one end of the drive shaft (45) that passes through the drive box (44). A scale (49) is provided on the drive box (44) and is coaxial with the drive shaft (45) but does not contact it. A pointer is provided on the rotating disk (451) to cooperate with the scale (49) and to indicate the rotation angle of the drive shaft (45) and the separation degree of the screen (35).

8. A foundry sand recycling device according to claim 1, characterized in that: The upper housing (22) is hinged to the upper side of the lower housing (21) via a hinge (23) to enable opening for maintenance; the top of the upper housing (22) is integrally connected to a feed hopper (24), and a cover plate (25) is movably covered at the top opening of the feed hopper (24).

9. A foundry sand recycling device according to claim 1, characterized in that: The rotor crushing mechanism includes a transmission main shaft (28) that passes laterally through the lower housing (21) and is supported by a main bearing seat (29), a hammer disc (210) fixedly mounted on the transmission main shaft (28), hammer shafts (211) distributed circumferentially on the hammer discs (210), and hammer heads (212) sleeved on the hammer shafts (211); the hammer heads (212) are located in the semi-cylindrical crushing space formed by the two sets of screens (35).

10. A foundry sand recycling device according to claim 7, characterized in that: It also includes a drive motor (26) mounted on the base (1) and a pulley assembly (27) connecting the drive motor (26) and the transmission spindle (28); the base (1) is a frame structure, and the bottom of the lower housing (21) extends in a funnel shape into the frame of the base (1); the drive box (44) is located on the side of the lower housing (21) away from the pulley assembly (27).

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