A kind of automatic control device for washing and filtering sand of regenerated sand

Abstract

The present invention discloses an automatic control device for washing and filtering regenerated sand, comprising: a sand washing tank and a grinding wheel; the grinding wheel comprises: two side plates arranged opposite to each other; two side edges of each partition are respectively connected to the inner side surfaces of the corresponding side plates; a filter screen is connected to the bottoms of two adjacent partitions; a self-opening and closing screen plate; a self-opening and closing screen plate is hinged at the partition of the grinding wheel, and as the grinding wheel rotates, the self-opening and closing screen plate flips under the influence of its own weight, and the filter chamber is in a closed state or an open state for discharging, or the self-opening and closing screen plate is in contact with the regenerated sand layer or the side wall of the shell in a closed state, and when the self-opening and closing screen plate passes through the liquid surface, the self-opening and closing screen plate in a vertical state can prevent floating objects from entering the filter chamber, thereby avoiding the floating objects from entering the filter chamber, and further avoiding the mixing of the regenerated sand and the floating objects.

Description

Technical Field

[0001] The invention relates to a sand washing machine, in particular to an automatic control device for washing and filtering regenerated sand. Background Art

[0002] The function of the sand washing machine is to clean the regenerated sand and mud powder in the machine-made sand in the water. The mud powder dissolves in water, and the regenerated sand is filtered out and discharged through the rotating sand washing wheel;

[0003] In the actual production process, regenerated sand and mud powder together with light floating objects will enter the sand washing tank. Light floating objects (such as leaves, branches, petals, etc.) will float on the liquid surface of the sand washing tank. When the sand washing wheel removes the regenerated sand, the floating objects will be removed together with the regenerated sand because the filter cavity formed is generally designed to be open. The floating objects need to be removed by manual sorting later.

[0004] In summary, how to prevent floating objects from entering the filter chamber and thereby prevent the regenerated sand in the filter chamber from mixing with the floating objects has become an urgent problem that researchers in this field need to solve. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to prevent floating objects from entering the filter chamber, thereby preventing the regenerated sand from mixing with the floating objects;

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] The present invention discloses an automatic control device for washing and filtering regenerated sand, comprising a shell having a sand washing trough; a grinding wheel rotatably arranged in the sand washing trough, wherein the grinding wheel comprises: two side plates arranged opposite to each other; a plurality of partitions arranged in an annular shape and equally spaced, wherein the two side edges of each partition are respectively connected to the inner side surfaces of the corresponding side plates; a filter screen, wherein the bottoms of two adjacent partitions are connected to the filter screen, and a filter cavity with an opening on the outer side is formed between the two side plates, the two adjacent partitions and the filter screen; a driving mechanism for driving the grinding wheel to rotate counterclockwise; a self-opening and closing mesh plate, wherein a self-opening and closing mesh plate is correspondingly arranged at the opening of each filter cavity, and the front end of the self-opening and closing mesh plate in the rotation direction of the grinding wheel is The hinged end is a free end at the rear end in the rotation direction of the sand washing wheel; the hinged end of the self-opening and closing mesh plate is hinged with the cavity wall of the filter chamber to form a hinge point, and the hinge point is located at the front end of the filter chamber in the rotation direction of the sand washing wheel; when the filter chamber rotates below the liquid level in the sand washing tank, the self-opening and closing mesh plate rotates clockwise due to contact with the top of the shell side wall, so that the free end of the self-opening and closing mesh plate approaches the top of the other adjacent partition to block the opening of the corresponding filter chamber; when the opening of the filter chamber rotates to the liquid level in the sand washing tank and toward the lower right, the self-opening and closing mesh plate rotates counterclockwise due to its own weight and the downward flow of regenerated sand in the filter chamber to open the opening of the filter chamber.

[0008] In this scheme, the sand washing wheel is rotated by a driving mechanism and is arranged in the sand washing tank. The partitions arranged at equal intervals on the sand washing wheel are located between the two side plates. The bottom of the two partitions is provided with a filter screen. The side plate is provided with a rotating shaft near the top of the partition. The rotating shaft is connected to the hinged end of the self-opening and closing mesh plate. The free end of the self-opening and closing mesh plate can rotate with the sand washing wheel, and the free end of the self-opening and closing mesh plate is supported on the top of another partition or the self-opening and closing mesh plate is flipped to be parallel to the partition. The diameter of the filter hole on the self-opening and closing mesh plate can allow the regenerated sand to pass through, but cannot allow floating objects to pass through. The floating objects in the sand washing tank float on the liquid surface, and the regenerated sand layer is below the liquid surface.

[0009] During the counterclockwise rotation of the grinding wheel, the self-opening and closing mesh plate at about 2 o'clock to 11 o'clock is affected by its own weight, and the other end of the self-opening and closing mesh plate is supported on the top of another partition. At this time, a self-opening and closing mesh plate is set at the top opening of the filter chamber to prevent leaves from the outside from falling into the filter chamber;

[0010] At about 10 o'clock to 9 o'clock, the self-opening and closing screen plate, because the partition changes from a horizontal state to an inclined state, the regenerated sand in a fluid state and flowing obliquely downward will be used on the inner side of the self-opening and closing screen plate, pushing the self-opening and closing screen plate to rotate counterclockwise, making the self-opening and closing screen plate and the partition plate parallel, which is convenient for unloading the regenerated sand, and the self-opening and closing screen plate will not affect the discharge of the regenerated sand;

[0011] The self-opening and closing mesh plate at about 8 o'clock to 5 o'clock contacts the surface of the regenerated sand layer or the side of the sand washing tank, the sand washing wheel rotates counterclockwise, and the self-opening and closing mesh plate rotates clockwise, the other end of the self-opening and closing mesh plate is supported on the top of another partition, and the end of the partition is inserted into the regenerated sand layer, and the regenerated sand enters the filter chamber through the self-opening and closing mesh plate;

[0012] The self-opening and closing mesh plate at about 4 o'clock to 3 o'clock is separated from the regenerated sand layer, and gradually rotates clockwise to a vertical state due to its own weight. In this state, the self-opening and closing mesh plate moves from below the liquid surface to the liquid surface. Due to the setting of the self-opening and closing mesh plate, floating objects will adhere to the surface of the self-opening and closing mesh plate or continue to float on the liquid surface and cannot enter the filter chamber. The above prevents floating objects from entering the filter chamber, thereby preventing the regenerated sand in the filter chamber from mixing with the floating objects.

[0013] In order to clean the floating objects attached to the self-opening and closing mesh plate, the present invention adopts a negative pressure cleaning device located at the upper right part of the device; the negative pressure cleaning device comprises: a support frame; a cleaning roller abutting against the self-opening and closing mesh plate, both ends of which are rotatably connected to the support frame; an outer cover, which is arranged outside the cleaning roller; a negative pressure channel, which passes through the outer cover and has a suction end close to the cleaning roller;

[0014] In this solution, a cleaning roller is connected to both ends of the support frame. The cleaning roller is set to rotate freely. The cleaning roller contacts the outer side of the self-opening and closing mesh plate and rotates following the grinding wheel. The cleaning brush on the cleaning roller acts on the outer side of the self-opening and closing mesh plate, and the floating objects after cleaning are sucked away by the negative pressure channel, ensuring that the floating objects will not fall onto the liquid surface for a second time.

[0015] In order to further clean the floating objects, the present invention adopts that the outer cover is provided with a collection tank obliquely below the cleaning roller;

[0016] The floating objects that are not sucked away by the negative pressure will be driven by the cleaning roller to move into the collection tank to prevent the floating objects from falling onto the liquid surface for the second time.

[0017] In order to limit the rotation angle of the self-opening and closing mesh plate, the present invention adopts a limiting section in which the top of the partition plate abuts against the back of the self-opening and closing mesh plate when the self-opening and closing mesh plate rotates to be flush with the partition plate;

[0018] By setting a limit section, the limit section abuts against the outer side surface of the self-opening and closing mesh plate near the hinge point, thereby limiting the maximum rotation angle of the self-opening and closing mesh plate.

[0019] In order to explain how the filter screen is connected to the partition, the present invention adopts that the two ends of the filter screen are respectively provided with a first flange and a second flange with inconsistent inclination angles; the first flange of one of the filter screens and the second flange of another adjacent filter screen are connected to the bottom of the partition; the outer side of the first flange and the outer side of the second flange are both provided with a pressure strip; the fastener passes through one of the pressure strips, the first flange, the partition, the second flange, and the other pressure strip in sequence and is fastened and connected;

[0020] In this solution, the first flange of one filter net and the second flange of the other filter net are connected to the bottom of the partition, and the two pressure plates are respectively arranged on the outside of the first flange and the outside of the second flange. The fasteners realize the compression of the two pressure plates, thereby fastening the first flange, the partition and the second flap.

[0021] In order to illustrate how the grinding wheel is rotatably arranged on the sand suction tank, the present invention adopts a rotating seat arranged on the top of the sand washing tank; the end of the rotating shaft in the middle of the grinding wheel is connected to the corresponding rotating seat;

[0022] In this solution, rotating seats are arranged on both sides of the top of the sand washing tank, and the rotating shaft is rotatably arranged on the rotating seats to realize the rotation of the sand washing wheel in the sand washing tank through which the negative pressure channel passes.

[0023] In order to illustrate the specific structure of the driving mechanism, the present invention uses a motor fixed to one side of the sand washing tank to drive the rotating shaft to rotate through a reducer;

[0024] In this solution, the motor and the reducer are connected by a belt, and the reducer and the rotating shaft are meshed by gears, so that the grinding wheel can be rotated.

[0025] In order to ensure that the cleaning roller always abuts against the self-opening and closing screen, the present invention adopts the support frame to open a waist hole along its length direction; the support shaft at the end of the cleaning roller is located in the waist hole;

[0026] Since the self-opening and closing mesh plate is a planar structure, when the self-opening and closing mesh plate rotates with the sand washing roller, the center line of the cleaning roller will deviate up and down when the cleaning roller contacts the self-opening and closing mesh plate. In order to keep the cleaning roller in contact with the self-opening and closing mesh plate at all times, the cleaning roller is floatingly set on the support frame through the waist hole. As the contact position between the cleaning roller and the self-opening and closing mesh plate changes, the cleaning roller will undergo relative displacement in the waist hole, so that the cleaning roller is always in contact with the self-opening and closing mesh plate to achieve cleaning of the self-opening and closing mesh plate of the sand washing wheel.

[0027] Beneficial effects of the invention: The invention is an automatic control device for washing and filtering regenerated sand. A self-opening and closing mesh plate is hinged at the partition of the grinding wheel. As the grinding wheel rotates, the self-opening and closing mesh plate flips under the influence of its own weight, and the filter chamber is in a closed state or an open state for discharging, or the self-opening and closing mesh plate is in contact with the regenerated sand layer or the side wall of the shell in a closed state. When the self-opening and closing mesh plate passes through the liquid surface, the self-opening and closing mesh plate in a vertical state can prevent floating objects from entering the filter chamber, thereby avoiding floating objects from entering the filter chamber, and further avoiding the mixing of regenerated sand and floating objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1 It is a schematic diagram of the structure of the present invention omitting some of the self-opening and closing screen plates;

[0030] Figure 2 It is a side view of the grinding wheel washing;

[0031] Figure 3 This is the coordination diagram of the grinding wheel washing device and the negative pressure cleaning device;

[0032] Figure 4 is a schematic diagram of the structure of a negative pressure cleaning device;

[0033] Figure 5 yes Figure 3 The enlarged view of point B;

[0034] Figure 6 It is a schematic diagram of the filter installation structure;

[0035] Figure 7 It is a schematic diagram of the coordination between the cleaning roller and the support frame;

[0036] Figure 8 It is a structural schematic diagram of the other side of the present invention;

[0037] In the figure: 1-sand washing trough, 11-shell, 2-grinding wheel, 21-side plate, 22-partition, 23-filter screen, 24-filter chamber, 25-self-opening and closing screen 251-hinge end, 252-free end, 26-rotating shaft, 27-limiting section, 3-negative pressure cleaning device, 31-support frame, 311-waist hole, 32-cleaning roller, 33-outer cover, 34-negative pressure channel, 35-collecting tank, 4-motor, 5-reducer. DETAILED DESCRIPTION

[0038] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0039] like Figure 2 , 8 As shown, the present invention is an automatic control device for washing and filtering regenerated sand, comprising a housing 11, which has a sand washing tank 1; a grinding wheel 2, which is rotatably arranged on the sand washing tank 1; the grinding wheel 2 comprises: two side plates 21 arranged opposite to each other; a plurality of partitions 22 arranged in an annular shape and equally spaced, and the two sides of each partition 22 are respectively connected to the inner side of the corresponding side plate 21; a filter screen 23, the bottoms of two adjacent partitions 22 are connected with the filter screen 23, and a filter cavity 24 with an opening on the outer side is formed between the two side plates 21, the two adjacent partitions 22 and the filter screen 23; a driving mechanism is used to drive the grinding wheel 2 to rotate counterclockwise; a self-opening and closing mesh plate 25, and a self-opening and closing mesh plate 25 is correspondingly arranged at the opening of each filter cavity 24, and the front end of the self-opening and closing mesh plate 25 in the rotation direction of the grinding wheel 2 is The hinged end 251 is at the rear end of the rotation direction of the sand washing wheel 2 as the free end 252; the hinged end 251 of the self-opening and closing mesh plate 25 is hinged with the cavity wall of the filter chamber 24 to form a hinge point, and the hinge point is located at the front end of the filter chamber 24 in the rotation direction of the sand washing wheel 2; when the filter chamber 24 rotates to below the liquid level in the sand washing tank 1, the self-opening and closing mesh plate 25 rotates clockwise due to contact with the top of the side wall of the shell 11, so that the free end 252 of the self-opening and closing mesh plate 25 approaches the top of another adjacent partition 22 to block the opening of the corresponding filter chamber 24; when the opening of the filter chamber 24 rotates to the liquid level in the sand washing tank 1 and toward the lower right, the self-opening and closing mesh plate 25 rotates counterclockwise due to its own weight and the downward flow of regenerated sand in the filter chamber 24 to open the opening of the filter chamber 24.

[0040] In this scheme, the sand washing wheel 2 is rotatably arranged in the sand washing tank 1 through a driving mechanism, and the partitions 22 arranged at equal intervals on the sand washing wheel 2 are located between the two side plates 21. The bottom of the two partitions 22 is provided with a filter screen 23, and the side plate 21 is provided with a rotating shaft near the top of the partition 22, and the rotating shaft is connected to the hinged end 251 of the self-opening and closing mesh plate 25. The free end 252 of the self-opening and closing mesh plate 25 can rotate with the sand washing wheel 2, and the other end of the self-opening and closing mesh plate 25 is supported on the top of another partition 22 or the self-opening and closing mesh plate 25 is turned over to be parallel to the partition 22; the diameter of the filter hole on the self-opening and closing mesh plate 25 can allow the regenerated sand to pass through, but cannot allow floating objects to pass through; the floating objects in the sand washing tank 1 float on the liquid surface, and the regenerated sand layer is below the liquid surface;

[0041] During the counterclockwise rotation of the grinding wheel 2, the self-opening and closing mesh plate 25 at about 2 o'clock to 11 o'clock is affected by its own weight, and the free end 252 of the self-opening and closing mesh plate 25 is supported on the top of another partition plate 22. At this time, the self-opening and closing mesh plate 25 is provided at the top opening of the filter chamber 24 to prevent leaves and the like from falling into the filter chamber.

[0042] The self-opening and closing mesh plate 25 at about 10 o'clock to 9 o'clock, because the partition plate 22 changes from a horizontal state to an inclined state, the regenerated sand in a fluid state and flowing obliquely downward will be used on the inner side of the self-opening and closing mesh plate 25, pushing the self-opening and closing mesh plate 25 to rotate counterclockwise, making the self-opening and closing mesh plate 25 and the partition plate 22 parallel, at this time, it is convenient to discharge the regenerated sand, and the self-opening and closing mesh plate 25 will not affect the discharge of the regenerated sand;

[0043] The self-opening and closing mesh plate 25 at about 8 o'clock to 5 o'clock contacts the surface of the regenerated sand layer or the side of the sand washing tank 1, the sand washing wheel 2 rotates counterclockwise, and the self-opening and closing mesh plate 25 rotates clockwise, supporting the free end 252 of the self-opening and closing mesh plate 25 on the top of another partition plate 22, and the end of the partition plate 22 is inserted into the regenerated sand layer, and the regenerated sand enters the filter chamber 24 through the self-opening and closing mesh plate 25;

[0044] The self-opening and closing mesh plate 25 at about 4 o'clock to 3 o'clock direction breaks away from the regenerated sand layer, and gradually rotates clockwise to a vertical state due to its own weight. In this state, the self-opening and closing mesh plate 25 moves from below the liquid surface to the liquid surface. Due to the setting of the self-opening and closing mesh plate 25, floating objects will adhere to the surface of the self-opening and closing mesh plate 25 or continue to float on the liquid surface and cannot enter the filter chamber 24. The above prevents floating objects from entering the filter chamber 24, thereby preventing the regenerated sand in the filter chamber 24 from mixing with the floating objects.

[0045] like Figure 3-4 As shown, in order to clean the floating objects attached to the self-opening and closing mesh plate, the present invention adopts a negative pressure cleaning device 3 located at the upper right part of the device; the negative pressure cleaning device 3 includes: a support frame 31; a cleaning roller 32 abutting against the self-opening and closing mesh plate 25, both ends of which are rotatably connected to the support frame 31; an outer cover 33, which is arranged outside the cleaning roller 32; a negative pressure channel 34, which passes through the outer cover 33 and places the suction end close to the cleaning roller 32;

[0046] In this solution, a cleaning roller 32 is connected to both ends of the support frame 31. The cleaning roller 32 is set to rotate freely. The cleaning roller 32 contacts the outer side of the self-opening and closing mesh plate 25 and rotates following the grinding wheel 2. The cleaning brush on the cleaning roller 32 acts on the outer side of the self-opening and closing mesh plate 25, and the floating objects after cleaning are sucked away by the negative pressure channel 34, ensuring that the floating objects will not fall onto the liquid surface for a second time.

[0047] like Figure 4 As shown, in order to further clean the floating objects, the present invention adopts an outer cover 33 disposed obliquely below the cleaning roller 32 and provided with a collecting tank 35;

[0048] The floating objects that are not sucked away by the negative pressure will be driven by the cleaning roller 32 to move into the collecting tank 35 to prevent the floating objects from falling onto the liquid surface for a second time.

[0049] like Figure 5As shown, in order to limit the rotation angle of the self-opening and closing mesh plate 25, the present invention adopts a limiting section 27 that limits the position of the top of the partition plate 22 against the back of the self-opening and closing mesh plate 25 when the self-opening and closing mesh plate 25 rotates to be flush with the partition plate 22;

[0050] By providing the limiting section 27 , the limiting section 27 abuts against the outer side surface of the self-opening and closing mesh plate 25 near the hinge point, thereby limiting the maximum rotation angle of the self-opening and closing mesh plate 25 .

[0051] like Figure 6 As shown, in order to illustrate how the filter screen is connected to the partition, the present invention adopts a filter screen 23 with two ends provided with a first flange 231 and a second flange 232 with inconsistent inclination angles; the first flange 231 of one filter screen 23 and the second flange 232 of another adjacent filter screen 23 are connected to the bottom of the partition 22; the outer side of the first flange 231 and the outer side of the second flange 232 are both provided with a pressure strip 233; the fastener 234 passes through one of the pressure strips 233, the first flange 231, the partition 22, the second flange 232, and the other pressure strip 233 in sequence and is fastened and connected;

[0052] In this solution, the first flange 231 of one filter net 23 and the second flange 232 of the other filter net 23 are connected to the bottom of the partition 22, and the two pressure plates 233 are respectively arranged on the outside of the first flange 231 and the outside of the second flange 232. The fastener 234 realizes the compression of the two pressure plates 233, thereby fastening the first flange 231, the partition 22, and the second flange 232.

[0053] like Figure 8 As shown, in order to illustrate how the grinding wheel is rotatably arranged on the sand suction tank, the present invention adopts a rotating seat arranged on the top of the sand washing tank 1; the end of the rotating shaft 26 in the middle of the grinding wheel 2 is connected to the corresponding rotating seat;

[0054] In this solution, rotating seats are arranged on both sides of the top of the sand washing tank 1, and the rotating shaft 26 is rotatably arranged on the rotating seats, so that the grinding wheel 2 can rotate in the sand washing tank 1.

[0055] like Figure 8 As shown, in order to illustrate the specific structure of the driving mechanism, the present invention uses a motor 4 fixed to one side of the sand washing tank 1 to drive the rotating shaft 26 to rotate through a reducer 5;

[0056] In this solution, the motor 4 and the reducer 5 are connected by a belt, and the reducer 5 is meshed with the rotating shaft 26 by gears, so that the grinding wheel 2 is rotated.

[0057] like Figure 1 , 8As shown, in order to ensure that the cleaning roller always abuts against the self-opening and closing screen, the present invention adopts a support frame 31 with a waist hole 311 along its length direction; the support shaft at the end of the cleaning roller 32 is located in the waist hole 311;

[0058] Since the self-opening and closing mesh plate 25 is a planar structure, when the self-opening and closing mesh plate 25 rotates following the sand washing roller, when the cleaning roller 32 contacts the self-opening and closing mesh plate 25, the center line of the cleaning roller 32 will deviate up and down. In order to keep the cleaning roller 32 in contact with the self-opening and closing mesh plate 25 at all times, the end of the cleaning roller 32 is floated on the support frame 31 through the waist hole 311. As the contact position of the cleaning roller 32 with the self-opening and closing mesh plate 25 changes, the cleaning roller 32 will move up and down relatively in the waist hole 311, so that the cleaning roller 32 is always in contact with the self-opening and closing mesh plate 25, thereby cleaning the self-opening and closing mesh plate 25.

[0059] Inspired by the above-mentioned ideal embodiment of the present invention, through the above-mentioned description, the left, right, up and down directions are only used to facilitate the description of the device. For example, if the fine grinding wheel rotates counterclockwise, the lower left position of the grinding wheel is the discharge port. Relevant staff can make various changes and modifications without deviating from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An automatic control device for washing and filtering regenerated sand, characterized in that: include: A housing having a sand washing tank; A grinding wheel is rotatably arranged on the sand washing tank, and the grinding wheel comprises: two side plates arranged opposite to each other; a plurality of partitions arranged in an annular shape and equally spaced, and the two sides of each partition are respectively connected to the inner side of the corresponding side plate; a filter screen, the bottom of two adjacent partitions is connected to the filter screen, and a filter cavity with an opening on the outer side is formed between the two side plates, the two adjacent partitions and the filter screen; A driving mechanism, used for driving the grinding wheel to rotate counterclockwise; A self-opening and closing mesh plate, wherein each of the filter chamber openings is provided with a self-opening and closing mesh plate, wherein the front end of the self-opening and closing mesh plate in the rotation direction of the grinding wheel is a hinged end, and the rear end of the self-opening and closing mesh plate in the rotation direction of the grinding wheel is a free end; The hinged end of the self-opening and closing mesh plate is hinged to the cavity wall of the filter cavity to form a hinge point, and the hinge point is located at the front end of the filter cavity in the rotation direction of the grinding wheel; When the filter chamber rotates to below the liquid level in the sand washing tank, the self-opening and closing mesh plate rotates clockwise due to contact with the top of the shell side wall, so that the free end of the self-opening and closing mesh plate approaches the top of another adjacent partition plate to cover the opening of the corresponding filter chamber; When the opening of the filter chamber rotates to the liquid surface in the sand washing tank and faces the lower right side, the self-opening and closing screen plate rotates counterclockwise due to its own weight and the downward flow of the regenerated sand in the filter chamber to open the opening of the filter chamber; A negative pressure cleaning device is provided at the upper right side of the device; The negative pressure cleaning device comprises: Support frame; A cleaning roller abutting against the self-opening and closing screen, both ends of which are rotatably connected to the support frame; An outer cover, which is arranged outside the cleaning roller; A negative pressure channel passes through the outer cover and has a suction end close to the cleaning roller; As the grinding wheel rotates, the self-opening and closing screen flips under the influence of its own weight, and the filter chamber is in a closed state or an open state for discharging, or the self-opening and closing screen is in contact with the regenerated sand layer and the side wall of the shell in a closed state. When the self-opening and closing screen passes through the liquid surface, the self-opening and closing screen in a vertical state can prevent floating objects from entering the filter chamber.

2. The automatic control device for washing and filtering regenerated sand according to claim 1 is characterized in that: The outer cover is provided with a collecting groove at a position obliquely below the cleaning roller.

3. The automatic control device for washing and filtering regenerated sand according to claim 1 is characterized in that: When the self-opening and closing mesh plate rotates to be flush with the partition, the top of the partition plate and the back of the self-opening and closing mesh plate are abutted against a limiting section.

4. The automatic control device for washing and filtering regenerated sand according to claim 1 is characterized in that: The two ends of the filter net are respectively provided with a first flange and a second flange with inconsistent inclination angles; the first flange of one of the filter nets and the second flange of another adjacent filter net are connected to the bottom of the partition; the outer side of the first flange and the outer side of the second flange are both provided with a pressure strip; the fastener passes through one of the pressure strips, the first flange, the partition, the second flange, and the other pressure strip in sequence and is fastened.

5. The automatic control device for washing and filtering regenerated sand according to claim 1 is characterized in that: A rotating seat is arranged on the top of the sand washing tank; and the end of the rotating shaft in the middle of the sand washing wheel is connected to the corresponding rotating seat.

6. The automatic control device for washing and filtering regenerated sand according to claim 5, characterized in that: The motor fixed on one side of the sand washing tank drives the rotating shaft to rotate through a reducer.

7. The automatic control device for washing and filtering regenerated sand according to claim 1 is characterized in that: The support frame is provided with a waist hole along its length direction; the support shaft at the end of the cleaning roller is located in the waist hole.

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