Fiber sanding dust recycling machine capable of automatically separating sand grains

Abstract

The invention relates to the technical field of dust separation equipment, and particularly discloses a fiber sanding dust recycling machine capable of automatically separating sand grains, which comprises a silt-sand separation unit, a cyclone separation unit, an air extractor and a feeding device, the silt-sand separation unit comprises a separation barrel, the lower end of the separation barrel is connected with a sand grain gathering hopper, and an annular barrel is concentrically fixed in the separation barrel; a centrifugal scattering barrel and a driving mechanism are concentrically arranged at the lower end of an inner cavity of the annular barrel, and the discharging end of the feeding device extends to the position over the center of the upper surface of the centrifugal scattering barrel; a through opening is formed in the outer circle face of the upper end of the separation barrel, an annular pipeline is arranged on the outer circle face of the separation barrel, a conveying pipe connected with the cyclone separation unit is arranged at the end of the annular pipeline, and an air exhaust pipe connected with an air exhaust device is arranged at the upper end of a center pipe of the cyclone separation unit. The fiber sanding dust recycling machine is novel in structural design, continuous and efficient separation treatment of large-batch fiberboard sanding dust is achieved, and the good using effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of dust separation equipment, and in particular discloses a fiber sanding dust recovery machine for automatically separating sand particles. Background Art

[0002] In the process of fiberboard production and processing, a sanding machine is needed to process the surface of the fiberboard to ensure the surface quality of the board. At present, the dust generated by sanding the fiberboard surface in the industry accounts for about 3% of the fiberboard product volume. These fiber powders can be recycled to realize resource utilization, but in the recycling process, they need to be separated from the sand grains detached from the sanding belt first, and then can be used as raw materials to mix and stir with the glue. However, due to the limitations of existing equipment for separating fiber powder and sand grains, it is impossible to efficiently and fully separate the fiberboard sanding powder.

[0003] The invention patent with application number 201410794585.9 discloses a fiberboard sanding dust recovery machine for automatically separating sand particles, including multiple dust suction heads; a bag dust collector, whose inlet is connected to the multiple dust suction heads through a main suction pipe; a dust removal fan, which is arranged at the end of the main suction pipe; a cyclone separator, whose air inlet is connected to the discharge port of the bag dust collector through a dust conveying pipe; a feeding fan, which is arranged at the starting end of the dust conveying pipe; and a dust bin for receiving sanding dust recovered from the cyclone separator; an L-shaped settling pipe is arranged in the middle section of the dust conveying pipe, both ends of the settling pipe are connected to the dust conveying pipe, the diameter of the settling pipe is larger than the diameter of the dust conveying pipe, and a sand collecting trough is arranged at the lower end of the settling pipe. Although the fiberboard sanding dust recovery machine disclosed in the patent realizes the separation of fiberboard sanding powder, it is limited by the shortcomings in the structural design. When realizing the separation of fiberboard sanding powder, only a small amount of fiberboard sanding powder can be separated and processed each time. This is because the cross-sectional area of ​​the pipeline is small. When the material is transported along the horizontal speed reducer pipe, a large amount of fiber powder cannot be separated from the sand particles by the airflow. Even when too much material is unloaded at one time, it may cause pipeline blockage. Therefore, in view of the above-mentioned shortcomings of the existing fiberboard sanding dust recovery machine that automatically separates sand particles, the present application proposes a newly designed fiber sanding dust recovery machine that automatically separates sand particles to solve the above-mentioned technical problems, and realizes the efficient and sufficient separation of sand particles and fiber powder in fiberboard sanding powder. Summary of the invention

[0004] The present invention aims to provide a fiber sanding dust recovery machine for automatically separating sand particles, so as to achieve efficient and full separation of sand particles and fiber powder in fiberboard sanding powder.

[0005] The present invention is achieved through the following technical solutions: A fiber sanding dust recovery machine for automatically separating sand particles, comprising a sand separation unit, a cyclone separation unit, an exhaust device and a feeding device, wherein the sand separation unit comprises a separation cylinder which is wide at the top and narrow at the bottom and is in a truncated cone shape, the lower end of the separation cylinder is connected to a sand gathering bucket, an annular cylinder is concentrically fixed in the separation cylinder, the upper end of the annular cylinder extends out of the separation cylinder and a communicating air hole is opened on the upper surface, the lower end of the annular cylinder extends to above the connection between the separation cylinder and the sand gathering bucket, a centrifugal spreading cylinder and a driving mechanism for driving the centrifugal spreading cylinder to rotate are concentrically arranged at the lower end of the inner cavity of the annular cylinder, and the lower feeding end of the feeding device extends to just above the center of the upper surface of the centrifugal spreading cylinder; A plurality of through openings are evenly arranged on the outer circumferential surface of the upper end of the separation cylinder, an annular pipe connected to the through openings is arranged on the outer circumferential surface of the separation cylinder, a conveying pipe connected to the cyclone separation unit is arranged at the end of the annular pipe, and an exhaust pipe connected to the exhaust device is arranged at the upper end of the central pipe of the cyclone separation unit.

[0006] As a further configuration of the above scheme, a first ring plate inclined upward is provided on the outer wall of the ring cylinder, and a second ring plate inclined downward is provided on the inner wall of the separation cylinder located above the first ring plate.

[0007] As a further configuration of the above scheme, a plurality of first sand unloading openings flush with the bottom of the first ring plate are evenly opened circumferentially on the ring cylinder, a rotating ring is rotatably fitted on the inner wall of the ring cylinder to cover the first sand unloading openings, and a second sand unloading opening corresponding to each first sand unloading opening is opened on the rotating ring.

[0008] As a further arrangement of the above scheme, an annular track is fixed on the inner wall of the annular cylinder above the first sand unloading port, the rotating ring is rotatably arranged on the annular track, an inner gear ring is arranged at the upper end of the rotating ring, a driving motor is arranged on the annular cylinder, and a gear meshing with the inner gear ring is arranged on the driving motor.

[0009] As a further configuration of the above scheme, the feeding device includes a hopper and an auger conveyor extending into the interior of the ring cylinder, the hopper is connected to the outer end of the auger conveyor, and the inner end of the auger conveyor is provided with a discharge pipe arranged concentrically with the centrifugal spreading cylinder.

[0010] As a further configuration of the above scheme, the driving mechanism includes a bracket fixed on the sand gathering bucket and extending into the annular cylinder, a centrifugal motor is arranged on the bracket, and a motor shaft of the centrifugal motor is connected to the centrifugal spreading cylinder.

[0011] As a further configuration of the above scheme, a plurality of filter ports are evenly arranged on the outer circumferential surface of the lower half of the annular cylinder, and a filter screen covering the filter ports is arranged on the inner wall of the annular cylinder.

[0012] As a further configuration of the above scheme, an inwardly recessed receiving groove is provided on the outer circumferential surface of the centrifugal spreading barrel, a radially movable brush strip is connected to the receiving groove via a spring and a guide rod, and the brush strip is provided with radially outwardly facing bristles.

[0013] During operation of the fiber sanding dust recovery machine for automatically separating sand particles disclosed in the present invention, a feeding device continuously conveys fiberboard sanding powder to the center of the upper surface of a centrifugal spreading cylinder, and then throws it out evenly to all sides under the action of centrifugal force. The thrown-out sanding powder falls along the uniform gap between the centrifugal spreading cylinder and the annular cylinder, and when it moves out of the gap, it is immediately sucked by the lower end of the gradient annular gap between the separation cylinder and the annular cylinder, so that light fiber powder in the sanding powder is sucked into it, while heavy sand particles fall into the sand particle gathering bucket.

[0014] During the movement of the light fiber powder from bottom to top in the gradual annular gap, the speed of the mixed airflow flowing upward along the annular gap becomes lower and lower due to the gradual increase of the annular gap between the separation cylinder and the annular cylinder from bottom to top, so that the force of the airflow on the sand particles becomes smaller and smaller, and finally the sand particles fall down under their own gravity to achieve separation from the fiber powder. Finally, under the action of the first ring plate and the second ring plate, a small number of sand particles that move to the top of the separation cylinder with the airflow will be blocked, weakening their own kinetic energy, and finally they will still fall into the sand particle gathering bucket under the action of gravity, thus completely achieving the separation of sand particles and fiber powder. The separated fiber powder finally enters the cyclone separation unit to achieve separation from the airflow, and then is discharged from the bottom of the cyclone separation unit.

[0015] In addition, the present invention further provides a filter port and a filter screen on the ring cylinder, so that the fiberboard sanding powder uniformly centrifugally thrown out in all directions can be sucked here at the first time, and part of the fiber powder is separated and processed under the filtering effect of the filter screen, so as to prevent part of the fiber powder from being settled in the sand collection bucket under the action of the sand particles. At the same time, after each operation for a period of time, the brush strip can be used to move radially outward to act on the surface of the filter screen, and then the filter screen is cleaned and dredged by the bristles during the rotation process to maintain the best filtering effect on the fiber powder. Beneficial Effects

[0016] The fiber sanding dust recovery machine disclosed in the present invention changes the material unloading method and pipeline air blowing conveying method in the prior art, utilizes centrifugal action to continuously throw the conveyed material uniformly to all sides, and then falls in the annular gap, and is immediately subjected to the strong negative pressure suction effect of the periphery when falling to the bottom, so that the light fiber powder in the material moves from bottom to top through the gap, while the heavy sand particles begin to fall under the action of gravity, thereby realizing the primary separation of most of the fiber powder and the sand particles in the fiberboard sanding dust, and then in the process of the fiber powder moving upward along the gradual annular gap, due to the reduction of gas flow rate and the blocking effect of the first and second ring plates, a small amount of sand particles mixed in the mixed gas can lose the kinetic energy of upward movement, and finally fall under the action of gravity, thereby realizing the secondary separation of the fiber powder and a small amount of sand particles, and the sand particles mixed in the powder can be completely removed after the two separations; the structural design of the entire fiber sanding dust recovery machine is novel, and the continuous and efficient separation and treatment of large quantities of fiberboard sanding dust is realized, and the use effect is good.

[0017] The present invention further provides a filter port and a filter screen on the cylinder, so that the centrifugally ejected material can first be sucked by the filter port during the falling process, and the sand particles are filtered and retained under the action of the filter screen, so that part of the fiber powder first enters the gradient annular gap, and the other part of the fiber powder and the sand particles are separated at the bottom of the annular gap, avoiding the situation that when there are too many sand particles in the powder, the fiber powder is settled into the sand particle gathering bucket under the action of the sand particles, and the fiber powder is fully recycled. In addition, the brush strip can be used to move radially outward to act on the surface of the filter screen, and then the filter screen is cleaned and unblocked by the bristles during the rotation process to maintain the best filtering effect on the fiber powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are 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 creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the internal planar structure of the silt separation unit in the present invention; Figure 3 It is a schematic diagram of the internal three-dimensional structure of the silt separation unit of the present invention from a first angle; Figure 4 It is a schematic diagram of the internal three-dimensional structure of the silt separation unit of the present invention from a first angle; Figure 5It is a schematic diagram of the three-dimensional structure of the annular pipeline, the delivery pipe, and the cyclone separation unit in the present invention; Figure 6 For the present invention Figure 3 A schematic diagram of the enlarged structure at A in the middle; Figure 7 It is a schematic diagram of the three-dimensional planar structure of the silt separation unit in Example 2 of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure at point B in the middle. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 8 , and describes the application in detail with reference to embodiments. Example 1

[0022] Embodiment 1 discloses a fiber sanding dust recovery machine for automatically separating sand particles, Figure 1 The main body of the fiber sanding dust recovery machine includes a powder sand separation unit 1, a cyclone separation unit 2, an exhaust device 3 and a feeding device 4. The powder sand separation unit 1 and the cyclone separation unit 2 are respectively fixed at the left and right ends of the frame 5, and the two are connected by a pipeline. The feeding device 4 extends to the inside of the powder sand separation unit 1, and the exhaust device 3 is connected to the top of the cyclone separation unit 2.

[0023] Reference Figure 2 , Attachment Figure 3 , Attachment Figure 4 and attached Figure 6The silt separation unit 1 includes a truncated cone-shaped separation cylinder 101 which is wide at the top and narrow at the bottom. A sand collecting bucket 102 is connected to the bottom of the separation cylinder 101, and a discharge valve 103 is connected to the bottom discharge end of the sand collecting bucket 102. An annular cylinder 104 is fixedly arranged concentrically in the separation cylinder 101. The upper end of the annular cylinder 104 extends out of the top of the separation cylinder 101, and a communicating air hole 1041 is opened on its upper surface. The lower end of the annular cylinder 104 extends to the upper part of the connection between the separation cylinder 101 and the sand collecting bucket 102, so that the annular gap between the separation cylinder 101 and the annular cylinder 104 gradually increases from bottom to top, so that under the same air extraction conditions, the speed of the mixed airflow flowing upward along the annular gap becomes lower and lower.

[0024] A bracket 105 extending to the lower end of the inner cavity of the annular cylinder 104 is fixedly connected to the conical wall of the sand gathering bucket 102, and a centrifugal motor 106 is fixedly installed on the bracket 105. A centrifugal spreading cylinder 107 arranged concentrically with the annular cylinder 104 is connected to the upper end of the motor shaft of the centrifugal motor 106, and a uniform feeding annular gap is formed between the centrifugal spreading cylinder 107 and the annular cylinder 104. The feeding device 4 includes a feeding hopper 401 and an auger conveyor 402. The auger conveyor 402 horizontally penetrates the separation cylinder 101 and the annular cylinder 104 and extends to the top of the centrifugal spreading cylinder 107. A discharge pipe 403 concentrically arranged with the centrifugal spreading cylinder 107 is arranged on the lower surface of the inner end of the auger conveyor 402. The lower end of the feeding hopper 401 is connected to the outer end of the auger conveyor 402, so that the fiberboard sanding powder in the feeding hopper 401 can be transported to the discharge pipe 403 by the auger conveyor 402, and then discharged to the center of the upper surface of the centrifugal spreading cylinder 107 by the discharge pipe 403.

[0025] In addition, in order to ensure the stable rotation of the centrifugal spreading barrel 107, the discharge pipe 403 in this embodiment 1 is in the shape of a cone that is wide at the top and narrow at the bottom, and a conical block 404 is fixed inside it through multiple circumferential connecting rods, and then a rotating shaft 108 that is rotatably connected to the lower surface of the conical block 404 is connected at the center of the upper surface of the centrifugal spreading barrel 107.

[0026] Reference Figure 1 and attached Figure 5 , an annular pipe 6 is fitted on the outer circumferential surface of the upper end of the separation cylinder 101, and a plurality of openings 109 communicating with the annular pipe 6 are opened on the outer circumferential surface of the upper end of the separation cylinder 101, and then a delivery pipe 7 is connected to the end of the annular pipe 6, and the delivery pipe 7 is connected to the cyclone separation unit 2 along the tangential direction. The specific cyclone separation unit 2 adopts a conventional cyclone separator, a powder feed pipe is arranged at the lower end, a protruding central pipe is connected to the top end, and an exhaust pipe 8 is connected between the central pipe and the exhaust device 3.

[0027] Reference Figure 2 and attached Figure 5A first ring plate 9 tilted upward is provided on the outer wall of the ring cylinder 104 above the auger conveyor 402, and a second ring plate 10 tilted downward is provided on the inner wall of the separation cylinder 101 above the first ring plate 9. The design of the first ring plate 9 and the second ring plate 10 can block the sand particles moving upward with the airflow, weaken their own kinetic energy, and finally fall into the sand particle collection bucket 102 under the action of gravity. In addition, in order to avoid a large amount of sand particles accumulating above the first ring plate 9, a plurality of first sand discharge ports 1042 flush with the bottom of the first ring plate 9 are evenly opened circumferentially on the ring cylinder 104, and an annular track 110 is fixed on the inner wall of the ring cylinder 104 above the first sand discharge ports 1042, and a rotating ring 111 is rotatably provided in the annular track 110 to fit the inner wall of the ring cylinder 104, and second sand discharge ports 112 corresponding to the first sand discharge ports 1042 are evenly opened circumferentially on the rotating ring 111. When it is necessary to remove the sand accumulated on the first ring plate 9, the rotating ring 111 is rotated and adjusted so that the originally misaligned first sand unloading port 1042 and the second sand unloading port 112 are radially aligned. Then the accumulated sand can pass through the two under the action of its own gravity and fall into the sand collection bucket 102 along the annular gap between the centrifugal spreading barrel 107 and the annular barrel 104.

[0028] Finally, in order to realize the rotation adjustment of the rotating ring 111, an inner gear ring 113 is provided at the upper end of the rotating ring 111, a driving motor 114 is installed on the top of the ring tube 104, and then a gear 115 meshing with the inner gear ring 113 is provided at the lower end of the motor shaft of the driving motor 114.

[0029] During the operation of the fiber sanding dust recovery machine disclosed in this embodiment 1, the fiberboard sanding powder is continuously transported by the feeding device 4 to the center of the upper surface of the centrifugal spreading cylinder 107, and then the fiberboard sanding powder is continuously centrifugally thrown out to the surroundings under the centrifugal action of the rotation of the centrifugal spreading cylinder 107. The thrown-out fiberboard sanding powder flows downward along the annular gap between the centrifugal spreading cylinder 107 and the annular cylinder 104.

[0030] After the fiberboard sanding powder flows out from the lower end of the annular gap, due to the maximum negative pressure between the separation cylinder 101 and the lower end of the annular cylinder 104, the fiber powder in the fiberboard sanding powder will be drawn to move upward, and most of the sand particles will fall into the sand particle collection bucket 102 under the action of their own gravity. When the fiber powder and a small number of sand particles move upward along the gradually changing annular gap between the separation cylinder 101 and the annular cylinder 104, since the annular gap between the separation cylinder 101 and the annular cylinder 104 gradually increases from bottom to top, the speed of the mixed airflow flowing upward along the annular gap becomes lower and lower, so that the sand particles are subjected to less and less force from the airflow, and finally fall under the action of their own gravity to achieve separation from the fiber powder. In addition, due to the design of the first ring plate 9 and the second ring plate 10, a very small number of sand particles that move to the top of the separation cylinder 101 with the airflow can be blocked, weakening their own kinetic energy, and finally causing them to fall into the sand particle collection bucket 102 under the action of gravity, thereby completely achieving the separation of sand particles and fiber powder.

[0031] Finally, the separated fiber powder enters the annular pipe 6 and is then transported to the cyclone separator 2 by the conveying pipe 7. The airflow changes from linear motion to circular motion. The fiber powder moves radially toward the wall of the device under the action of centrifugal force, hits the wall of the cylinder or cone, loses kinetic energy and falls along the wall, thus completing the separation of the fiber powder and the airflow. Example 2

[0032] Example 2 discloses a fiber sanding dust recovery machine for automatically separating sand particles, which is based on the technical solution in Example 1 and has a further optimized and improved design. The similarities between it and Example 1 will not be described again.

[0033] Reference Figure 7 and attached Figure 8 In this embodiment 2, a plurality of filter ports 1043 are evenly opened on the outer circumferential surface of the lower half of the annular cylinder 104. At the same time, a filter screen 116 covering the filter ports 1043 is arranged on the inner wall of the annular cylinder 104, and the filter pore size of the filter screen 116 is between that of fiber powder and sand particles.

[0034] A receiving groove 117 is recessed inwardly on the outer circumferential surface of the centrifugal spreading barrel 107, and the receiving groove 117 is flush with the height of the filter screen 116. A brush strip 119 is connected to the receiving groove 117 through a spring 118, and a large number of bristles 120 are arranged on the radial outer surface of the brush strip 119. Finally, guide rods 121 arranged in the radial direction are connected to both the upper and lower ends of the brush strip 119, and the guide rods 121 are arranged to penetrate the inner end wall of the receiving groove 117.

[0035] The present embodiment 2 adopts the improved design of the above structure. When the fiberboard sanding powder flows downward along the annular gap between the centrifugal spreading cylinder 107 and the annular cylinder 104, a part of the fine fiber powder can directly enter the gradual annular gap between the separation cylinder 101 and the annular cylinder 104 through the filter screen 116, and the other part flows out from the lower end of the annular gap and moves upward from the bottom of the annular gap formed by the separation cylinder 101 and the annular cylinder 104, thereby avoiding the situation where too much fiberboard sanding powder is scattered at one time, causing a part of the fiber powder to be settled into the sand gathering bucket 102 under the action of the sand.

[0036] In addition, after running for a period of time, the feeding action of the feeding device 4 is stopped first, and then the rotation speed of the centrifugal motor 106 is increased to make the centrifugal spreading barrel 107 rotate at a faster speed. At this time, the brush bar 119 overcomes the tensile force of the spring 118 under the action of the strong centrifugal force, and then moves radially outward until the bristles 120 contact the inner surface of the filter screen 116, so that the filter screen 116 is cleaned and unblocked by the bristles 120 during the rotation process, so that the filter screen 116 can maintain a high efficiency filtering effect.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fiber sanding dust recovery machine for automatically separating sand particles, comprising a sand separation unit, a cyclone separation unit, an exhaust device and a feeding device, characterized in that: The silt separation unit comprises a separation cylinder which is wide at the top and narrow at the bottom and is truncated into a cone shape, the lower end of the separation cylinder is connected to a sand gathering bucket, an annular cylinder is concentrically fixed in the separation cylinder, the upper end of the annular cylinder extends out of the separation cylinder and a communicating air hole is opened on the upper surface, the lower end of the annular cylinder extends to above the connection between the separation cylinder and the sand gathering bucket, a centrifugal spreading cylinder and a driving mechanism for driving the centrifugal spreading cylinder to rotate are concentrically arranged at the lower end of the inner cavity of the annular cylinder, and the lower feeding end of the feeding device extends to just above the center of the upper surface of the centrifugal spreading cylinder; A plurality of through openings are evenly arranged on the outer circumferential surface of the upper end of the separation cylinder, an annular pipe connected to the through openings is arranged on the outer circumferential surface of the separation cylinder, a conveying pipe connected to the cyclone separation unit is arranged at the end of the annular pipe, and an exhaust pipe connected to the exhaust device is arranged at the upper end of the central pipe of the cyclone separation unit.

2. The fiber sanding dust recovery machine for automatically separating sand particles according to claim 1, characterized in that: A first ring plate inclined upward is arranged on the outer wall of the ring cylinder, and a second ring plate inclined downward is arranged on the inner wall of the separation cylinder located above the first ring plate.

3. The fiber sanding dust recovery machine for automatically separating sand particles according to claim 2, characterized in that: The ring cylinder is evenly provided with a plurality of first sand discharge openings flush with the bottom of the first ring plate in the circumferential direction, a rotating ring is rotatably arranged on the inner wall of the ring cylinder to cover the first sand discharge openings, and the rotating ring is provided with a second sand discharge opening corresponding to each first sand discharge opening.

4. The fiber sanding dust recovery machine for automatically separating sand particles according to claim 3, characterized in that: An annular track is fixed on the inner wall of the annular cylinder above the first sand unloading port, the rotating ring is rotatably arranged on the annular track, an inner gear ring is arranged on the upper end of the rotating ring, a driving motor is arranged on the annular cylinder, and a gear meshing with the inner gear ring is arranged on the driving motor.

5. The fiber sanding dust recovery machine for automatically separating sand particles according to claim 1, characterized in that: The feeding device comprises a hopper and an auger conveyor extending into the interior of the ring cylinder, the hopper is connected to the outer end of the auger conveyor, and the inner end of the auger conveyor is provided with a feed pipe concentrically arranged with the centrifugal spreading cylinder.

6. The fiber sanding dust recovery machine for automatically separating sand particles according to claim 1, characterized in that: The driving mechanism comprises a bracket which is fixed on the sand gathering bucket and extends into the annular cylinder. A centrifugal motor is arranged on the bracket, and a motor shaft of the centrifugal motor is connected to the centrifugal spreading cylinder.

7. The fiber sanding dust recovery machine for automatically separating sand particles according to claim 1, characterized in that: A plurality of filter ports are evenly arranged on the outer circumferential surface of the lower half of the annular cylinder, and a filter screen covering the filter ports is arranged on the inner wall of the annular cylinder.

8. The fiber sanding dust recovery machine for automatically separating sand particles according to claim 7, characterized in that: An inwardly recessed receiving groove is arranged on the outer circumferential surface of the centrifugal spreading barrel, a brush strip arranged to move radially is connected to the receiving groove via a spring and a guide rod, and the brush strip is provided with bristles facing radially outward.

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