Molding sand recovery equipment for castings

Abstract

The invention relates to the field of sand mold casting, in particular to molding sand recycling equipment for castings. The crusher comprises a crusher body, a crushing device and a feeding device, a feeding cavity, a crushing cavity and a discharging cavity are formed in the crusher body, and the crushing device is arranged in the crushing cavity and can crush materials; the feeding device comprises a first packing auger and a second packing auger which are arranged in the feeding cavity, and the first packing auger and the second packing auger extend in the first direction and are arranged in the second direction; the first auger and the second auger can rotate around the axes of the first auger and the second auger, and projections of blades of the first auger and blades of the second auger on a projection plane perpendicular to the axis directions of the blades of the first auger and the second auger are at least partially overlapped. The feeding device is arranged to be double-auger feeding, in the feeding process, the first auger and the second auger can extrude materials and pre-crush the materials, the pre-crushed materials are conveyed to the crushing device and then crushed again, the crushing pressure of the crushing device is relieved, and the materials are prevented from being accumulated at the crushing device.

Description

Technical Field

[0001] The invention relates to the field of sand casting, and in particular to a sand recovery device for castings. Background Art

[0002] Sand casting refers to a casting method that produces castings in sand molds. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting. Since the molding materials used in sand casting are cheap and easy to obtain, the mold is simple to manufacture, and it can adapt to the single-piece production, batch production and mass production of castings, it has long been the basic process in casting production. Molding sand is the basic raw material for sand casting. After casting, the molding sand can be recycled and then reused many times. During the casting process, the molding sand will clump and harden due to pressure and high temperature environment, so it needs to be broken up when recycled. In large-scale casting production and intelligent casting, crushers are often added to the intelligent casting island assembly line, and the crushers are used to crush and screen the used molding sand to improve the recycling efficiency and thus improve production efficiency.

[0003] During use of the molding sand recovery crusher in the related art, when the feeding speed is fast, the molding sand blocks may accumulate in the crushing chamber, affecting the crushing effect and reducing the crushing efficiency.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] According to the shortcomings of the prior art, the present invention proposes a casting sand recovery device to solve the problem that the existing casting sand crushing equipment is prone to material accumulation.

[0006] The present invention provides a casting sand recovery device that adopts the following technical solution:

[0007] A machine base is provided with a crushing body on the machine base, and a feeding chamber, a crushing chamber and a discharging chamber connected in sequence are formed inside the crushing body, the feeding chamber is located at one side of the crushing chamber, and the discharging chamber is located at the bottom of the crushing chamber. A feeding port and a discharging port are provided on the crushing body, the feeding port is connected to the feeding chamber, and the discharging port is connected to the discharging chamber;

[0008] A crushing device, which is disposed in the crushing chamber and is configured to crush the material;

[0009] A feeding device comprises a first auger and a second auger arranged in a feeding chamber, the first auger and the second auger extend along a first direction and are arranged along a second direction, the first direction and the second direction are perpendicular, the first auger and the second auger can both rotate around their own axes, the first auger and the second auger rotate in opposite directions and in opposite directions to transport materials to a crushing device, and the projections of the blades of the first auger and the blades of the second auger on a projection plane perpendicular to the axial direction thereof at least partially overlap.

[0010] Optionally, the crushing device includes a crushing screen and a crushing motor. The crushing screen is arranged in the crushing chamber. The crushing screen is cylindrical and its axis is parallel to the axes of the first auger and the second auger. The crushing screen can rotate around its own axis. At least one end of the crushing screen close to the feeding chamber is open and thus connected to the feeding chamber. The crushing motor is arranged in the crushing body and its output end is connected to the crushing screen.

[0011] Optionally, the distance between the first auger and the second auger is adjustable and is configured to be inversely correlated with the degree of material accumulation in the crushing screen.

[0012] Optionally, a support plate is provided in the feeding chamber, and the support plate can be slidably provided on the crushing body along the radial direction of the first auger and the second auger, and the second auger is rotatably provided on the support plate. A drive cylinder is provided on the crushing body, and the output end of the drive cylinder is connected to the support plate.

[0013] Optionally, an arc plate is connected to one side of the support plate, the arc plate is located in the feeding cavity, and the inner diameter of the arc plate is adapted to the outer diameter of the second auger.

[0014] Optionally, the casting sand recovery device further comprises a sensor, and the sensor is configured to sense the rotation speed of the first auger or the second auger, thereby controlling the action of the driving cylinder.

[0015] Optionally, a sensing member is provided in the crushing screen, and the sensing member includes a core shaft and a sensing plate uniformly provided on the core shaft along the circumferential direction, the sensing plate extends radially along the core shaft, and the core shaft is coaxial with the crushing screen; the sensing member can rotate around its own axis and has a preset rotation resistance, and when the material in the crushing screen accumulates and contacts the sensing plate, the material rotates with the crushing screen and pushes the sensing member to rotate through the sensing plate;

[0016] The casting sand recovery equipment also includes a power transmission device, which is configured to drive the first auger and the second auger to rotate in opposite directions at the same speed and to convert the rotation of the induction member into a speed reduction movement of the first auger and the second auger.

[0017] Optionally, the power transmission device includes a power driving part and a transmission reversing part, the power driving part is configured to drive the first auger to rotate and convert the rotation of the induction member into a speed reduction motion of the first auger; the transmission reversing part is configured to make the second auger rotate in the same opposite direction as the first auger.

[0018] Optionally, the power drive unit includes:

[0019] A sun wheel is rotatably disposed on the crushing machine body and is coaxially fixedly connected to the core shaft of the induction member. The sun wheel has a preset rotation resistance, thereby making the induction member have a preset rotation resistance;

[0020] An outer gear ring, which is rotatably arranged on the crusher body and is located outside the sun gear;

[0021] A plurality of planetary gears are provided, and the plurality of planetary gears are evenly distributed along the circumference of the sun gear and are arranged between the sun gear and the outer gear ring, and the planetary gears are meshed with the outer gear ring and the sun gear;

[0022] A power gear is rotatably arranged on the crusher body and is externally connected to a driving motor, and the power gear is externally meshed with the outer gear ring;

[0023] The planet carrier is rotatably connected to the planetary gear. The first auger is rotatably sleeved on the outer side of the core shaft of the induction component and is fixedly connected to the planet carrier.

[0024] Optionally, the transmission reversing part includes a large gear, a small gear, an input pulley, an output pulley, a double pulley, a first connecting rod, a second connecting rod, a first belt, and a second belt;

[0025] The input pulley is coaxially fixedly sleeved on the outer side of the rod body of the first auger;

[0026] The large gear and the small gear are both arranged on the support plate, the large gear is coaxially fixedly connected with the rod body of the second auger, the small gear is rotatably connected with the support plate, the large gear is meshed with the small gear, and the output pulley is coaxially fixedly connected with the small gear;

[0027] The first connecting rod is rotatably arranged on the crushing machine body, and the double pulley is rotatably connected to an end of the first connecting rod away from the crushing machine body;

[0028] One end of the second connecting rod is rotatably connected to the pinion gear, and the other end is rotatably connected to one end of the first connecting rod on which the double pulley is mounted;

[0029] The first belt is wound between the input pulley and the double pulley, and the second belt is wound between the output pulley and the double pulley.

[0030] The beneficial effects of the present invention are as follows: a casting sand recovery device of the present invention sets the feeding device as a double auger feeding. During the feeding process, the first auger and the second auger can extrude the material and pre-crush the material. The pre-crushed material is transported to the crushing device and crushed again, thereby reducing the crushing pressure of the crushing device and avoiding the accumulation of material at the crushing device.

[0031] Furthermore, the distance between the first auger and the second auger can be adjusted. When materials are accumulated inside the crushing screen, the extrusion force on the materials during feeding is increased by reducing the gap between the first auger and the second auger, thereby improving the pre-crushing effect and further reducing the crushing pressure of the crushing device.

[0032] Furthermore, a sensing element is provided inside the crushing screen. When materials are accumulated inside the crushing screen, the rotation speeds of the first and second auger are reduced through the cooperation of the sensing element and the power transmission device, thereby reducing the feeding speed and avoiding further accumulation of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the overall structure of a casting sand recovery device of the present invention;

[0035] Figure 2 It is a front view of a casting sand recovery device of the present invention;

[0036] Figure 3 It is a schematic diagram of the structure of the feeding device, the power transmission device and the induction component in the present invention;

[0037] Figure 4 for Figure 3 Side view of

[0038] Figure 5 for Figure 3 A front view of

[0039] Figure 6 for Figure 4 Middle AA section view;

[0040] Figure 7 for Figure 5 The stereogram after the middle BB section is cut;

[0041] Figure 8 for Figure 3 Enlarged view of point C in the middle;

[0042] Fig. 9 for Figure 6 Enlarged view of point D in the middle;

[0043] Fig.10 for Figure 7 Enlarged view of point E in the middle.

[0044] In the figure:

[0045] 100, machine base; 110, crushing machine body; 111, feed inlet; 112, discharge outlet;

[0046] 200, crushing device; 210, crushing motor; 220, crushing screen; 221, bearing;

[0047] 300. Feeding device;

[0048] 310, first auger; 320, second auger; 330, support plate; 331, sliding shoulder; 332, arc plate; 340, drive cylinder;

[0049] 400, power transmission device;

[0050] 410, power drive unit; 411, sun gear; 412, planet carrier; 413, outer ring gear; 414, planet gear; 415, power gear; 416, drive motor;

[0051] 420, transmission reversing unit; 421, large gear; 422, small gear; 423, input pulley; 424, output pulley; 425, double pulley; 426, first connecting rod; 427, second connecting rod; 428, first belt; 429, second belt;

[0052] 500, induction member; 510, mandrel; 520, induction plate. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0054] like Figures 1 to 10 As shown, a casting sand recovery device provided by an embodiment of the present invention can crush and screen the used casting sand, thereby realizing its recycling. The casting sand recovery device is arranged in the intelligent production line of the intelligent casting island, receives the used casting sand of the previous process, and crushes and screens it. The crushed and screened sand mold flows into the next process for further processing, and then returns to the front end process of the production line to participate in casting again. The casting sand recovery device provided by the present invention specifically includes a machine base 100, a crushing device 200 and a feeding device 300.

[0055] A crushing body 110 is arranged on the machine base 100, and a feeding chamber, a crushing chamber and a discharging chamber which are connected in sequence are formed inside the crushing body 110. The feeding chamber is located at one side of the crushing chamber, and the discharging chamber is located at the bottom of the crushing chamber. A feed port 111 and a discharge port 112 are arranged on the crushing body 110. The feed port 111 is connected to the feeding chamber, and the discharge port 112 is connected to the discharge chamber.

[0056] The crushing device 200 is disposed in the crushing chamber and is configured to crush the material.

[0057] The feeding device 300 includes a first auger 310 and a second auger 320 arranged in a feeding chamber. The first auger 310 and the second auger 320 extend along a first direction and are arranged along a second direction. The first direction is the conveying direction of the material from the feeding chamber to the crushing chamber, and the second direction is perpendicular to the first direction. The first auger 310 and the second auger 320 can both rotate around their own axes. The first auger 310 and the second auger 320 rotate in opposite directions and in opposite directions to convey the material to the crushing device 200. The projections of the blades of the first auger 310 and the blades of the second auger 320 on a projection plane (vertical projection plane) perpendicular to the axial direction thereof at least partially overlap.

[0058] During the use of the solution of this embodiment, the material is put into the feeding cavity through the feed port 111 and falls between the blades of the first auger 310 and the second auger 320. The first auger 310 and the second auger 320 rotate in opposite directions to transport the material to the crushing device 200. During the feeding process, the blades of the first auger 310 and the blades of the second auger 320 overlap on the vertical projection plane, so the material is squeezed during the transportation process to achieve pre-crushing. After that, the material reaches the crushing device 200 and is crushed again under the action of the crushing device 200. The qualified material after crushing is discharged from the discharge port 112. That is to say, the solution of this embodiment realizes pre-crushing during the transportation process through the arrangement of the first auger 310 and the second auger 320, reduces the crushing pressure of the crushing device 200, improves the crushing effect, improves the crushing efficiency, and avoids the accumulation of materials at the crushing device 200.

[0059] In a further embodiment, the crushing device 200 includes a crushing screen 220 and a crushing motor 210. The crushing screen 220 is arranged in the crushing chamber. The crushing screen 220 is cylindrical and its axis is parallel to the axis of the first auger 310 and the second auger 320. The crushing screen 220 can rotate around its own axis. The crushing screen 220 is open at least at one end close to the feeding chamber, and is connected to the feeding chamber to facilitate the entry of materials into the interior thereof. The crushing motor 210 is arranged in the crushing body 110 and its output end is connected to the crushing screen 220, and can drive the crushing screen 220 to rotate. The material enters the crushing screen 220 after being transported by the first auger 310 and the second auger 320, and is lifted and lowered by the rotation of the crushing screen 220 to achieve re-crushing. Further, a bearing 221 is arranged at the connection between the crushing screen 220 and the crushing body 110, and the friction resistance at the connection between the crushing screen 220 and the crushing body 110 is reduced by the bearing 221, thereby reducing the rotation resistance of the crushing screen 220.

[0060] In a further embodiment, the distance between the first auger 310 and the second auger 320 can be adjusted and is configured to be negatively correlated with the degree of material accumulation in the crushing screen 220. That is, as the degree of material accumulation in the crushing screen 220 increases, the distance between the first auger 310 and the second auger 320 is reduced, so that the extrusion force on the material during the transportation process is increased, thereby improving the pre-crushing effect of the first auger 310 and the second auger 320 on the material, and further reducing the crushing pressure of the crushing screen 220.

[0061] In order to adjust the distance between the first auger 310 and the second auger 320, a preferred embodiment of the present invention is provided, in which a support plate 330 is provided in the feeding chamber, and the support plate 330 can be slidably provided on the crushing body 110 along the radial direction of the first auger 310 and the second auger 320, and the second auger 320 is rotatably provided on the support plate 330, and a driving cylinder 340 is provided on the crushing body 110, and the output end of the driving cylinder 340 is connected to the support plate 330 to push the support plate 330 to move, thereby pushing the second auger 320 to move closer to or away from the first auger 310, so as to adjust the distance between the first auger 310 and the second auger 320. Preferably, the driving cylinder 340 of the present invention can be set to a pneumatic cylinder, a hydraulic cylinder or other power element that can achieve the same function. Furthermore, to facilitate the sliding of the support plate 330, sliding shoulders 331 are provided at the upper and lower ends of the support plate 330, and guide grooves are provided at corresponding positions on the internal top and bottom surfaces of the crusher body 110, and the sliding shoulders 331 are slidably arranged in the guide grooves.

[0062] Furthermore, an arc plate 332 is connected to one side of the support plate 330, and the arc plate 332 is located in the feeding chamber. The inner diameter of the arc plate 332 is adapted to the outer diameter of the second auger 320. When the support plate 330 moves, it drives the arc plate 332 and the second auger 320 to move synchronously, thereby avoiding leakage of material during transportation due to a gap between the second auger 320 and the inner wall of the feeding chamber after the second auger 320 moves.

[0063] It should also be added that the casting sand recovery device of the present invention also includes a sensor (not shown in the figure), which is configured to sense the rotation speed of the first auger 310 or the second auger 320, and then control the action of the drive cylinder 340.

[0064] In a further embodiment, a sensing member 500 is provided in the crushing screen 220, and the sensing member 500 includes a core shaft 510 and a sensing plate 520 uniformly arranged on the core shaft 510 along the circumferential direction, and the sensing plate 520 extends along the radial direction of the core shaft 510, and the core shaft 510 is coaxial with the crushing screen 220; the sensing member 500 can rotate around its own axis and has a preset rotational resistance. When the material in the crushing screen 220 accumulates and contacts with the sensing plate 520, the material rotates with the crushing screen 220 and pushes the sensing member 500 to rotate through the sensing plate 520.

[0065] The casting sand recovery device of the present invention further includes a power transmission device 400 , which is configured to drive the first auger 310 and the second auger 320 to rotate in opposite directions at the same speed and to convert the rotation of the induction member 500 into a decelerating motion of the first auger 310 and the second auger 320 .

[0066] In the scheme of this embodiment, the power transmission device 400 drives the first auger 310 and the second auger 320 to rotate at the same speed and in opposite directions to transport the material to the crushing screen 220. During the transportation process, the first auger 310 and the second auger 320 squeeze the material to achieve pre-crushing. After the material reaches the crushing screen 220, it is crushed again under the rotation of the crushing screen 220. At the same time, by arranging a sensing member 500 in the crushing screen 220, when the material in the crushing screen 220 accumulates to a certain extent, the material contacts the sensing plate 520. In the process of rotating with the crushing screen 220, the material applies a force to the sensing member 500 through the sensing plate 520 to rotate the sensing member 500. The rotation of the sensing member 500 reduces the rotation speed of the first auger 310 and the second auger 320 through the power transmission device 400, thereby reducing the feeding speed and avoiding further accumulation of the material in the crushing screen 220.

[0067] In a further embodiment, the power transmission device 400 includes a power driving unit 410 and a transmission reversing unit 420. The power driving unit 410 is configured to drive the first auger 310 to rotate and convert the rotation of the sensing element 429; the second belt; 500 into a speed reduction movement of the first auger 310; the transmission reversing unit 420 is configured to make the second auger 320 rotate in the same speed and opposite direction as the first auger 310.

[0068] Preferably, the power driving unit 410 includes a power gear 415, a sun gear 411, a planetary gear 414, an outer ring gear 413 and a planetary carrier 412;

[0069] The sun wheel 411 is rotatably disposed on the crushing machine body 110 and is coaxially fixedly connected with the induction member 429; the second belt; the core shaft 510 of 500. The sun wheel 411 has a preset rotation resistance, thereby making the induction member 500 have a preset rotation resistance.

[0070] The outer gear ring 413 is rotatably disposed on the crusher body 110 and is located outside the sun gear 411;

[0071] There are multiple planetary gears 414, which are evenly distributed along the circumference of the sun gear 411 and are disposed between the sun gear 411 and the outer gear ring 413, and the planetary gears 414 are meshed with the outer gear ring 413 and the sun gear 411;

[0072] The planet carrier 412 is rotatably connected to the planetary gear 414, and the first auger 310 is rotatably sleeved on the outer side of the core shaft 510 of the induction member 500 and fixedly connected to the planet carrier 412; it can be understood that, in order to facilitate the rotatable connection between the first auger 310 and the induction member 500, the rod body of the first auger 310 is hollow inside and sleeved on the outer side of the core shaft 510 of the induction member 500;

[0073] The power gear 415 is rotatably disposed on the crusher body 110 and is externally connected to a driving motor 416 . The power gear 415 is externally meshed with the outer gear ring 413 , thereby being able to transmit power to the outer gear ring 413 .

[0074] The transmission reversing part 420 includes a large gear 421, a small gear 422, an input pulley 423, an output pulley 424, a double pulley 425, a first connecting rod 426, a second connecting rod 427, a first belt 428, and a second belt 429;

[0075] The input pulley 423 is coaxially fixedly sleeved on the outer side of the rod body of the first auger 310;

[0076] The large gear 421 and the small gear 422 are both arranged on the support plate 330, the large gear 421 is coaxially fixedly connected with the rod body of the second auger 320, the small gear 422 is rotatably connected with the support plate 330, the large gear 421 is meshed with the small gear 422, and the output pulley 424 is coaxially fixedly connected with the small gear 422;

[0077] The first connecting rod 426 is rotatably disposed on the crushing machine body 110, and the double pulley 425 is rotatably connected to an end of the first connecting rod 426 away from the crushing machine body 110;

[0078] One end of the second connecting rod 427 is rotatably connected to the pinion 422, and the other end is rotatably connected to one end of the first connecting rod 426 on which the double pulley 425 is mounted;

[0079] The first belt 428 is wound between the input pulley 423 and the double pulley 425 , and the second belt 429 is wound between the output pulley 424 and the double pulley 425 .

[0080] It should be supplemented that, in order to facilitate the manufacturing of the integral formation of the output pulley 424 and the pinion 422, a rotating column is provided on the support plate 330, the output pulley 424 and the pinion 422 are rotatably provided on the rotating column, and one end of the first connecting rod 426 is rotatably provided on the rotating column. In the process of the first auger 310 rotating synchronously with the planetary carrier 412, the first auger 310 drives the input pulley 423 to rotate, the input pulley 423 drives the output pulley 424 to rotate through the transmission of the first belt 428 and the second belt 429, the output drives the pinion 422 to rotate, the pinion 422 drives the large gear 421 to rotate, and the large gear 421 drives the second auger 320 to rotate, so that the first auger 310 and the second auger 320 rotate in the same speed and in the opposite direction.

[0081] The arrangement of the first connecting rod 426 and the second connecting rod 427 can adapt to the movement of the second auger 320 .

[0082] In combination with the above embodiments, the use principle and working process of the present invention are as follows:

[0083] In the initial state, the motor drives the power gear 415 to rotate, and the power reaches the outer gear ring 413. Since the friction of the sun gear 411 is relatively large, the outer gear ring 413 drives the planetary frame 412 to rotate in the initial state, and the planetary frame 412 drives the first auger 310 to rotate. The first auger 310 rotates through the first belt 428 and the second belt 429 to drive the small gear 422 to rotate, and the small gear 422 drives the large gear 421 to rotate. The large gear 421 drives the second auger 320 to rotate in the same speed and in the opposite direction as the first auger 310, and materials are added to the feed port 111. The materials are transported to the crushing screen 220 through the first auger 310 and the second auger 320, and are pre-crushed during the transportation process. After the materials reach the crushing screen 220, they are crushed again under the rotation of the crushing screen 220, and the qualified materials are screened by the crushing screen 220 and fall into the discharge cavity and are discharged through the discharge port 112.

[0084] When there is a lot of material inside the crushing screen 220, the material contacts the induction plate 520. When the material is rotated by the crushing screen 220, the induction plate 520 causes the induction member 500 to rotate. The induction member 500 drives the sun gear 411 to rotate synchronously. Since the rotation directions of the sun gear 411 and the outer gear ring 413 are opposite, the rotation speed of the planetary carrier 412 is slowed down, and the material feeding speed is slowed down. At this time, the control system controls the driving cylinder 340 to extend, so that the support plate 330 slides relative to the crushing body 110, and the support plate 330 drives the second auger 320 to move toward the first auger 310. The distance between the first auger 310 and the second auger 320 is reduced, and the extrusion force applied to the material after entering becomes larger, thereby improving the effect of material pre-crushing and further preventing material accumulation.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A casting sand recovery device, characterized in that: include: A machine base is provided with a crushing body on the machine base, and a feeding chamber, a crushing chamber and a discharging chamber connected in sequence are formed inside the crushing body, the feeding chamber is located at one side of the crushing chamber, and the discharging chamber is located at the bottom of the crushing chamber. A feeding port and a discharging port are provided on the crushing body, the feeding port is connected to the feeding chamber, and the discharging port is connected to the discharging chamber; A crushing device, which is disposed in the crushing chamber and is configured to crush the material; A feeding device comprises a first auger and a second auger arranged in a feeding chamber, the first auger and the second auger extend along a first direction and are arranged along a second direction, the first direction and the second direction are perpendicular, the first auger and the second auger can both rotate around their own axes, the first auger and the second auger rotate in opposite directions and in opposite directions to transport materials to a crushing device, and the projections of the blades of the first auger and the blades of the second auger on a projection plane perpendicular to the axial direction thereof at least partially overlap.

2. A casting sand recovery device according to claim 1, characterized in that: The crushing device includes a crushing screen and a crushing motor. The crushing screen is arranged in the crushing chamber. The crushing screen is cylindrical and its axis is parallel to the axes of the first auger and the second auger. The crushing screen can rotate around its own axis. At least one end of the crushing screen close to the feeding chamber is open and thus connected to the feeding chamber. The crushing motor is arranged in the crushing body and its output end is connected to the crushing screen.

3. A casting sand recovery device according to claim 2, characterized in that: The distance between the first auger and the second auger is adjustable and is configured to be inversely correlated with the degree of material accumulation in the crushing screen.

4. A casting sand recovery device according to claim 3, characterized in that: A support plate is arranged in the feeding cavity, and the support plate can be slidably arranged on the crushing machine body along the radial direction of the first auger and the second auger, and the second auger is rotatably arranged on the support plate. A driving cylinder is arranged on the crushing machine body, and the output end of the driving cylinder is connected to the support plate.

5. The casting sand recovery equipment according to claim 4, characterized in that: One side of the support plate is connected with an arc plate, the arc plate is located in the feeding cavity, and the inner diameter of the arc plate is adapted to the outer diameter of the second auger.

6. The casting sand recovery equipment according to claim 4, characterized in that: The casting sand recovery device also includes a sensor, which is configured to sense the rotation speed of the first auger or the second auger, thereby controlling the action of the driving cylinder.

7. The casting sand recovery equipment according to claim 4, characterized in that: The crushing screen is provided with an induction member, which includes a core shaft and an induction plate uniformly arranged on the core shaft along the circumferential direction. The induction plate extends along the radial direction of the core shaft, and the core shaft is coaxial with the crushing screen. The induction member can rotate around its own axis and has a preset rotation resistance. When the material in the crushing screen accumulates and contacts the induction plate, the material rotates with the crushing screen and pushes the induction member to rotate through the induction plate. The casting sand recovery equipment also includes a power transmission device, which is configured to drive the first auger and the second auger to rotate in opposite directions at the same speed and to convert the rotation of the induction member into a speed reduction movement of the first auger and the second auger.

8. The casting sand recovery equipment according to claim 7, characterized in that: The power transmission device includes a power driving part and a transmission reversing part. The power driving part is configured to drive the first auger to rotate and convert the rotation of the induction member into a speed reduction motion of the first auger; the transmission reversing part is configured to make the second auger rotate in the same speed and opposite direction as the first auger.

9. The casting sand recovery equipment according to claim 8, characterized in that: The power drive unit includes: A sun wheel is rotatably disposed on the crushing machine body and is coaxially fixedly connected to the core shaft of the induction member. The sun wheel has a preset rotation resistance, thereby making the induction member have a preset rotation resistance; An outer gear ring, which is rotatably arranged on the crusher body and is located outside the sun gear; A plurality of planetary gears are provided, and the plurality of planetary gears are evenly distributed along the circumference of the sun gear and are arranged between the sun gear and the outer gear ring, and the planetary gears are meshed with the outer gear ring and the sun gear; A power gear is rotatably arranged on the crusher body and is externally connected to a driving motor, and the power gear is externally meshed with the outer gear ring; The planet carrier is rotatably connected to the planetary gear. The first auger is rotatably sleeved on the outer side of the core shaft of the induction component and is fixedly connected to the planet carrier.

10. The casting sand recovery equipment according to claim 8, characterized in that: The transmission reversing part includes a large gear, a small gear, an input pulley, an output pulley, a double pulley, a first connecting rod, a second connecting rod, a first belt, and a second belt; The input pulley is coaxially fixedly sleeved on the outer side of the rod body of the first auger; The large gear and the small gear are both arranged on the support plate, the large gear is coaxially fixedly connected with the rod body of the second auger, the small gear is rotatably connected with the support plate, the large gear is meshed with the small gear, and the output pulley is coaxially fixedly connected with the small gear; The first connecting rod is rotatably arranged on the crushing machine body, and the double pulley is rotatably connected to an end of the first connecting rod away from the crushing machine body; One end of the second connecting rod is rotatably connected to the pinion gear, and the other end is rotatably connected to one end of the first connecting rod on which the double pulley is mounted; The first belt is wound between the input pulley and the double pulley, and the second belt is wound between the output pulley and the double pulley.

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