A fiber sanding dust recycler that automatically separates grit

Abstract

The present application relates to the technical field of dust separation equipment, and discloses a fiber sanding dust recovery machine capable of automatically separating sand particles, which comprises a powder sand separation unit, a cyclone separation unit, a gas suction device and a feeding device. The powder sand separation unit comprises a separation cylinder, the lower end of the separation cylinder is connected with a sand particle gathering hopper, a ring cylinder is fixed concentrically in the separation cylinder, a centrifugal material scattering cylinder and a driving mechanism are arranged concentrically at the lower end of the inner cavity of the ring cylinder, and the discharging end of the feeding device extends to the upper center of the upper surface of the centrifugal material scattering cylinder. A through opening is formed in the outer circular surface of the upper end of the separation cylinder, an annular pipeline is arranged on the outer circular surface of the separation cylinder, the end of the annular pipeline is provided with a conveying pipe connected with the cyclone separation unit, and the upper end of the central pipe of the cyclone separation unit is provided with a gas suction pipe connected with the gas suction device. The fiber sanding dust recovery machine has a novel structure design, can realize continuous and efficient separation treatment of a large amount of fiber board sanding dust, and has good use effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dust separation equipment, and discloses a fiber sanding dust recovery machine capable of automatically separating sand particles. BACKGROUND

[0002] In the production and processing of fiber boards, a sander is needed to process the surface of the fiber boards to ensure the surface quality of the boards. At present, the amount of dust generated by sanding the surface of fiber boards accounts for about 3% of the amount of fiber board products in the industry. These fiber powders can be recycled for resource utilization, but they need to be separated from the sand particles detached from the sand belt before recycling, and can be mixed and stirred with glue liquid after separation. However, due to the constraints of existing equipment for separating fiber powders from sand particles, the fiber board sanding powders cannot be efficiently and sufficiently separated.

[0003] The patent application No. 201410794585.9 discloses a fiber board sanding dust recovery machine capable of automatically separating sand particles, which comprises a plurality of dust suction heads, a bag-type dust collector, a dust fan, a cyclone separator, a feeding fan, and a dust bin. The inlet of the bag-type dust collector is connected with the plurality of dust suction heads through a main suction pipe. The dust fan is arranged at the end of the main suction pipe. The inlet of the cyclone separator is connected with the outlet of the bag-type dust collector through a dust conveying pipe. The feeding fan is arranged at the beginning of the dust conveying pipe. The dust bin is used to receive the sanding dust recovered from the cyclone separator. An L-shaped settling pipe is arranged in the middle section of the dust conveying pipe. The two ends of the settling pipe are communicated with the dust conveying pipe. The diameter of the settling pipe is larger than that of the dust conveying pipe. A sand particle collecting groove is arranged at the lower end of the settling pipe. The fiber board sanding dust recovery machine disclosed in the patent application can separate the fiber board sanding powders, but due to the insufficient structure design, it can only separate a small amount of fiber board sanding powders at a time. This is because the cross-sectional area of the pipe is small, and the large amount of fiber powders cannot be completely separated from the sand particles by air flow when the materials are conveyed along the horizontal deceleration pipe. Even in the case of excessive one-time feeding, the pipe may be blocked. Therefore, in view of the above-mentioned deficiencies of the existing fiber board sanding dust recovery machine capable of automatically separating sand particles, a new fiber sanding dust recovery machine capable of automatically separating sand particles is proposed to solve the above-mentioned technical problems and to achieve efficient and sufficient separation of sand particles from fiber powders in the fiber board sanding powders. SUMMARY

[0004] The present application aims to provide a fiber sanding dust recovery machine capable of automatically separating sand particles to achieve efficient and sufficient separation of sand particles from fiber powders in the fiber board sanding powders.

[0005] The present application is achieved by the following technical solutions:

[0006] The application discloses a fiber sanding dust recovery machine capable of automatically separating sand grains, which comprises a powder sand separating unit, a cyclone separating unit, a suction device and a feeding device, wherein the powder sand separating unit comprises a separating cylinder which is wide at the top and narrow at the bottom and is in the shape of a circular truncated cone, the lower end of the separating cylinder is connected with a sand grain collecting hopper, a ring cylinder is fixed concentrically in the separating cylinder, the upper end of the ring cylinder extends out of the separating cylinder and the upper surface of the ring cylinder is provided with communicating air holes, the lower end of the ring cylinder extends to above the position where the separating cylinder is connected with the sand grain collecting hopper, the inner cavity of the ring cylinder is provided with a centrifugal material scattering cylinder at the lower end and a driving mechanism for driving the centrifugal material scattering cylinder to rotate, and the lower discharging end of the feeding device extends to directly above the center of the upper surface of the centrifugal material scattering cylinder.

[0007] A plurality of through holes are uniformly arranged on the outer circular surface of the upper end of the separating cylinder, and an annular pipeline which is connected with the through holes is arranged on the outer circular surface of the separating cylinder, the end of the annular pipeline is provided with a conveying pipe which is connected with the cyclone separating unit, and the central pipe of the cyclone separating unit is provided with a suction pipe which is connected with the suction device.

[0008] As a further arrangement of the above-mentioned scheme, an upwardly-inclined first ring plate is arranged on the outer wall of the ring cylinder, and a downwardly-inclined second ring plate is arranged on the inner wall of the separating cylinder above the first ring plate.

[0009] As a further arrangement of the above-mentioned scheme, a plurality of first sand discharging openings which are flush with the bottom of the first ring plate are uniformly arranged on the ring cylinder, a rotating ring which covers the first sand discharging openings is rotatably arranged on the inner wall of the ring cylinder, and a second sand discharging opening corresponding to each first sand discharging opening is arranged on the rotating ring.

[0010] As a further arrangement of the above-mentioned scheme, an annular track is fixed on the inner wall of the ring cylinder above the first sand discharging openings, the rotating ring is rotatably arranged on the annular track, the upper end of the rotating ring is provided with an inner ring gear, a driving motor is arranged on the ring cylinder, and a gear which is engaged with the inner ring gear is arranged on the driving motor.

[0011] As a further arrangement of the above-mentioned scheme, the feeding device comprises a hopper and an auger conveyor which extends into the interior of the ring cylinder, the hopper is connected with the outer end of the auger conveyor, and a discharging pipe which is concentric with the centrifugal material scattering cylinder is arranged on the inner end of the auger conveyor.

[0012] As a further arrangement of the above-mentioned scheme, the driving mechanism comprises a support which is fixed on the sand grain collecting hopper and extends into the ring cylinder, a centrifugal motor is arranged on the support, and the motor shaft of the centrifugal motor is connected with the centrifugal material scattering cylinder.

[0013] As a further arrangement of the above-mentioned scheme, a plurality of filtering openings are uniformly arranged on the outer circular surface of the lower half of the ring cylinder, and a filter screen which covers the filtering openings is arranged on the inner wall of the ring cylinder.

[0014] As a further arrangement of the above scheme, the outer cylindrical surface of the centrifugal spreading cylinder is provided with an inwardly recessed receiving groove, and a brush strip arranged to move radially is connected in the receiving groove by a spring and a guide rod, and the brush strip is provided with brush hairs directed radially outward.

[0015] The fiber sanding dust recovery machine for automatically separating sand grains disclosed in the present application continuously transports fiber board sanding powder to the center of the upper surface of the centrifugal spreading cylinder by the feeding device during operation, and then uniformly spreads out in all directions under the action of centrifugal force. The spread-out sanding powder falls along the uniform gap between the centrifugal spreading cylinder and the ring cylinder, and when moving out of the gap, it is first subjected to the suction action of the lower end of the gradually changing annular gap between the separation cylinder and the ring cylinder, so that the light fiber powder in the sanding powder is sucked in, and the heavy sand grains fall into the sand grain collecting hopper.

[0016] During the movement of the light fiber powder from the bottom to the top of the gradually changing annular gap, the annular gap between the separation cylinder and the ring cylinder gradually increases from the bottom to the top, and the speed of the mixed gas flow flowing upward along the annular gap becomes lower and lower, so that the force of the gas flow on the sand grains becomes smaller and smaller, and finally the sand grains fall under the action of their own gravity, realizing separation from the fiber powder. Finally, under the action of the first ring plate and the second ring plate, a small part of the sand grains moving with the gas flow to the top of the separation cylinder are blocked, their kinetic energy is weakened, and finally they fall into the sand grain collecting hopper under the action of gravity, thereby completely realizing the separation of sand grains and fiber powder. The separated fiber powder finally enters the cyclone separation unit to realize separation from the gas flow, and then is discharged from the bottom of the cyclone separation unit.

[0017] In addition, the present application further provides a filter port and a filter screen on the ring cylinder, so that the fiber board sanding powder uniformly centrifugally spread out can be first subjected to the suction action here, and part of the fiber powder is separated and treated by the filtering action of the filter screen, so as to avoid part of the fiber powder being settled into the sand grain collecting hopper under the action of the sand grains. At the same time, after a period of operation, the brush strip can be moved radially outward, the brush hairs act on the surface of the filter screen, and then the filter screen is cleaned and dredged by the brush hairs during rotation, so as to maintain the best filtering effect on the fiber powder. Advantages

[0018] The fiber sanding dust recovery machine disclosed by the application changes the feeding mode and the pipeline air blowing conveying mode in the prior art, continuously uniformly flings the conveyed material to the periphery by utilizing the centrifugal effect, then makes the material fall in the annular gap, and when falling to the bottom, firstly receives the strong negative pressure suction effect of the periphery, so that the fiber powder with light quality in the material moves upward from the gap, while the sand with heavy quality starts to fall under the action of gravity, realizing the first separation of the majority of the fiber powder from the sand in the fiber board sanding dust, then in the process of upward movement of the fiber powder along the gradually changing annular gap, due to the reduction of the gas flow rate and the blocking effect of the first and second annular plates, a small amount of sand mixed in the mixed gas can lose the kinetic energy of upward movement, and finally falls under the action of gravity, realizing the second separation of the fiber powder from the small amount of sand, and after two times of separation, the sand mixed in the powder can be completely removed.

[0019] The application further provides a filtering port and a filter screen on the cylinder, so that the material flung by centrifugal force can firstly receive the suction effect of the filtering port in the falling process, and the sand is filtered and retained under the action of the filter screen, so that part of the fiber powder enters the gradually changing annular gap, and the other part of the fiber powder and the sand are separated at the bottom of the annular gap, avoiding the situation that when the sand mixed in the powder is too much, the fiber powder is settled into the sand collecting hopper under the action of the sand, and realizing the full recycling of the fiber powder. In addition, the bristles can be moved radially outward to act on the surface of the filter screen, and then the filter screen is cleaned and dredged by the bristles in the rotating process, so as to maintain the best filtering effect of the fiber powder. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0021] Figure 1 It is a three-dimensional structure schematic diagram of the application;

[0022] Figure 2 It is an internal plane structure schematic diagram of the powder-sand separation unit in the application;

[0023] Figure 3 It is a first angle three-dimensional structure schematic diagram of the internal structure of the powder-sand separation unit in the application;

[0024] Figure 4 It is a first angle three-dimensional structure schematic diagram of the internal structure of the powder-sand separation unit in the application;

[0025] Figure 5 This is a three-dimensional structural diagram of the annular pipe, conveying pipe, and cyclone separation unit in this invention;

[0026] Figure 6 For the present invention Figure 3 Enlarged structural diagram at point A;

[0027] Figure 7 This is a schematic diagram of the three-dimensional planar structure of the silt separation unit in Embodiment 2 of the present invention;

[0028] Figure 8 For the present invention Figure 7 A magnified structural diagram at point B in the middle. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-8 This application will be described in detail with reference to the embodiments.

[0031] Example 1

[0032] Example 1 discloses an automatic fiber sanding dust recovery machine for separating sand particles, see attached figure. Figure 1 The main body of the fiber sanding dust recovery machine includes a sand separation unit 1, a cyclone separation unit 2, an exhaust device 3, and a feeding device 4. The sand separation unit 1 and the cyclone separation unit 2 are fixed at the left and right ends of the frame 5, respectively, and are connected by a pipe. The feeding device 4 extends into the interior of the sand separation unit 1, and the exhaust device 3 is connected to the top of the cyclone separation unit 2.

[0033] Reference Appendix Figure 2 Appendix Figure 3 Appendix Figure 4 and attached Figure 6, the silt separating unit 1 comprises a separating cylinder 101 in the shape of a circular truncated cone with a wide upper end and a narrow lower end, the bottom of the separating cylinder 101 is connected with a sand collecting hopper 102, and a discharge valve 103 is connected with the bottom discharge end of the sand collecting hopper 102. A ring cylinder 104 is fixedly arranged in the separating cylinder 101 in a concentric manner, the upper end of the ring cylinder 104 extends out of the top of the separating cylinder 101, and a plurality of through holes 1041 are formed in the upper surface of the ring cylinder 104, and the lower end of the ring cylinder 104 extends above the connecting position of the separating cylinder 101 and the sand collecting hopper 102, so that the annular gap between the separating cylinder 101 and the ring cylinder 104 gradually increases from bottom to top, so that the speed of the mixed gas flow flowing upward along the annular gap gradually decreases under the same air extraction condition.

[0034] A support 105 extending into the lower end of the inner cavity of the ring cylinder 104 is fixedly connected to the conical wall of the sand collecting hopper 102, a centrifugal motor 106 is fixedly installed on the support 105, a centrifugal scattering cylinder 107 arranged in a concentric manner with the ring cylinder 104 is connected to the upper end of the motor shaft of the centrifugal motor 106, and a uniform discharging annular gap is formed between the centrifugal scattering cylinder 107 and the ring cylinder 104. The feeding device 4 comprises a feeding hopper 401 and an auger conveyor 402, the auger conveyor 402 horizontally extends through the separating cylinder 101, the ring cylinder 104 and extends above the centrifugal scattering cylinder 107, a discharging pipe 403 arranged in a concentric manner with the centrifugal scattering cylinder 107 is arranged at the lower surface of the inner end of the auger conveyor 402, and the lower end of the feeding hopper 401 is connected with the outer end of the auger conveyor 402, so that the fiber board sanding powder in the feeding hopper 401 can be conveyed to the discharging pipe 403 by the auger conveyor 402, and then discharged to the center of the upper surface of the centrifugal scattering cylinder 107 by the discharging pipe 403.

[0035] In addition, in order to ensure the stable rotation of the centrifugal scattering cylinder 107, the discharging pipe 403 in the first embodiment is in the shape of a circular truncated cone with a wide upper end and a narrow lower end, a plurality of taper blocks 404 are fixed in the discharging pipe 403 through a plurality of connecting rods in the circumferential direction, and a rotating shaft 108 is connected to the lower surface of the taper block 404 in a rotating manner at the center of the upper surface of the centrifugal scattering cylinder 107.

[0036] Referring to the drawings Figure 1 and the drawings Figure 5 An annular pipe 6 is arranged on the outer circular surface of the upper end of the separating cylinder 101 in a fitted manner, a plurality of through holes 109 are formed in the outer circular surface of the upper end of the separating cylinder 101 and are in communication with the annular pipe 6, a conveying pipe 7 is connected to the end of the annular pipe 6, and the conveying pipe 7 is connected with the cyclone separating unit 2 in a tangential direction. Specifically, the cyclone separating unit 2 adopts a conventional cyclone separator, a powder discharging pipe is arranged at the lower end of the cyclone separating unit 2, a center pipe extending out is connected to the top end of the cyclone separating unit 2, and an air extraction pipe 8 is connected between the center pipe and the air extraction device 3.

[0037] Referring to the drawings Figure 2 and the drawings Figure 5A first ring plate 9 is arranged on the outer wall of the ring cylinder 104 above the auger conveyor 402, and a second ring plate 10 is arranged on the inner wall of the separation cylinder 101 above the first ring plate 9. Through the design of the first ring plate 9 and the second ring plate 10, the sand particles moving upward with the airflow can be blocked, and their kinetic energy can be weakened, so that they finally fall into the sand collecting hopper 102 under the action of gravity. In addition, in order to avoid the accumulation of a large amount of sand particles above the first ring plate 9, a plurality of first sand discharge openings 1042 are uniformly arranged on the outer wall of the ring cylinder 104, and the bottoms of the first sand discharge openings 1042 are flush with the first ring plate 9. An annular track 110 is fixed on the inner wall of the ring cylinder 104 above the first sand discharge openings 1042, and a rotating ring 111 is rotatably arranged in the annular track 110 and abuts against the inner wall of the ring cylinder 104. A plurality of second sand discharge openings 112 are uniformly arranged on the rotating ring 111 in a circumferential direction and correspond to the first sand discharge openings 1042. When it is necessary to discharge the sand particles accumulated on the first ring plate 9, the rotating ring 111 is rotated to adjust the radial alignment of the first sand discharge openings 1042 and the second sand discharge openings 112, and then the accumulated sand particles can fall into the sand collecting hopper 102 through the first sand discharge openings 1042 and the second sand discharge openings 112 under the action of gravity.

[0038] Finally, in order to realize the rotation adjustment of the rotating ring 111, an inner gear ring 113 is arranged on the upper end of the rotating ring 111, a driving motor 114 is installed on the top of the ring cylinder 104, and a gear 115 is arranged on the lower end of the motor shaft of the driving motor 114 and engages with the inner gear ring 113.

[0039] In the operation of the fiber sanding dust recovery machine disclosed in Embodiment 1, the fiber board sanding powder is continuously conveyed to the center of the upper surface of the centrifugal spreading cylinder 107 by the feeding device 4, and then continuously centrifuged outward under the centrifugal action of the centrifugal spreading cylinder 107. The fiber board sanding powder after being centrifuged flows downward along the annular gap between the centrifugal spreading cylinder 107 and the ring cylinder 104.

[0040] After the fiberboard sanding dust powder flows out from the lower end of the annular gap, the fiber powder in the fiberboard sanding dust powder is drawn to move upward due to the maximum negative pressure between the separation cylinder 101 and the lower end of the ring cylinder 104, and most of the sand particles fall into the sand particle collecting hopper 102 under the action of gravity. When the fiber powder and a small part of the sand particles move upward along the gradually changing annular gap between the separation cylinder 101 and the ring cylinder 104, the speed of the mixed gas flow flowing upward along the annular gap gradually decreases due to the gradually increasing annular gap between the separation cylinder 101 and the ring cylinder 104 from bottom to top, so that the force acting on the sand particles by the gas flow gradually decreases, and finally the sand particles fall under the action of gravity, realizing the separation from the fiber powder. In addition, due to the design of the first ring plate 9 and the second ring plate 10, a small part of the sand particles moving with the gas flow to the top of the separation cylinder 101 can be blocked, and their kinetic energy can be weakened, so that they finally fall into the sand particle collecting hopper 102 under the action of gravity, thereby completely realizing the separation of the sand particles and the fiber powder.

[0041] Finally, the separated fiber powder enters the annular pipeline 6, and is then conveyed to the cyclone separator 2 by the conveying pipe 7. The gas flow changes from linear motion to circular motion, the fiber powder moves radially to the wall under the action of centrifugal force, collides with the wall of the cylinder or cone to lose kinetic energy and falls along the wall, and the separation of the fiber powder and the gas flow is completed.

[0042] Embodiment 2

[0043] Embodiment 2 discloses an automatic sand particle separating fiber sanding dust recovery machine which is further optimized and improved based on the technical scheme in embodiment 1. The same parts as those in embodiment 1 will not be described again.

[0044] Reference is made to the accompanying drawings Figure 7 and the accompanying drawings Figure 8 , the embodiment 2 is uniformly provided with a plurality of filter openings 1043 on the outer circumferential surface of the lower half of the ring cylinder 104, and a filter screen 116 covering the filter openings 1043 is arranged on the inner wall of the ring cylinder 104, and the size of the filter holes of the filter screen 116 is between the fiber powder and the sand particles.

[0045] The outer circumferential surface of the centrifugal spreading cylinder 107 is inwardly recessed with a receiving groove 117, and the height of the receiving groove 117 is flush with that of the filter screen 116. A brush strip 119 is connected in the receiving groove 117 by a spring 118, and a large number of bristles 120 are arranged on the radially outer side of the brush strip 119. Finally, guide rods 121 are arranged on the upper and lower ends of the brush strip 119 along the radial direction, and the guide rods 121 penetrate through the inner end wall of the receiving groove 117.

[0046] The embodiment 2 is improved by the above structure, in the process of the fiberboard sanding powder flowing along the annular gap between the centrifugal scattering cylinder 107 and the ring cylinder 104, a part of the fine fiber powder can directly enter the gradually changed annular gap between the separation cylinder 101 and the ring cylinder 104 through the filter screen 116, and the other part flows out from the lower end of the annular gap and then moves upward from the bottom of the annular gap formed by the separation cylinder 101 and the ring cylinder 104, which avoids that when the fiberboard sanding powder is scattered too much at one time, a part of the fiber powder is settled into the sand particle collecting hopper 102 under the action of the sand particles.

[0047] In addition, after running for a period of time, the feeding action of the feeding device 4 is stopped first, and then the rotating speed of the centrifugal motor 106 is increased so that the centrifugal scattering cylinder 107 rotates at a faster speed, at this time, the brush strip 119 overcomes the stretching 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 dredged by the bristles 120 during rotation, so that the filter screen 116 can maintain high filtering efficiency.

[0048] The above only is the preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fiber dust recovery machine for automatically separating sand grains, comprising a fine sand separating unit, a cyclone separating unit, a suction device, and a feeding device, characterized by, The silt separating unit comprises a separating cylinder which is wide at the top and narrow at the bottom and is in the shape of a circular truncated cone, a sand particle collecting hopper connected to the lower end of the separating cylinder, a ring cylinder fixed concentrically in the separating cylinder, the upper end of the ring cylinder extending out of the separating cylinder and the upper surface of the ring cylinder being provided with communicating air holes, the lower end of the ring cylinder extending above the connecting position of the separating cylinder and the sand particle collecting hopper, a centrifugal spreading cylinder concentrically arranged at the lower end of the inner cavity of the ring cylinder and a driving mechanism for driving the centrifugal spreading cylinder to rotate, the lower end of the feeding device extending directly above the center of the upper surface of the centrifugal spreading cylinder; a plurality of through openings are uniformly arranged on the outer circular surface of the upper end of the separating cylinder, an annular pipeline is arranged on the outer circular surface of the separating cylinder and is in communication with the through openings, the end of the annular pipeline is provided with a conveying pipe connected with a cyclone separating unit, and the upper end of the central pipe of the cyclone separating unit is provided with a suction pipe connected with a suction device. An upwardly-inclined first ring plate is arranged on the outer wall of the ring cylinder, and a downwardly-inclined second ring plate is arranged on the inner wall of the separating cylinder above the first ring plate. A plurality of first sand discharging openings which are flush with the bottom of the first ring plate are uniformly arranged on the ring cylinder in the circumferential direction, and a rotating ring which covers the first sand discharging openings is rotatably arranged on the inner wall of the ring cylinder, and the rotating ring is provided with a second sand discharging opening corresponding to each first sand discharging opening.

2. The automatic fiber sanding dust recycler that separates sand particles according to claim 1, wherein, An annular track is fixed on the inner wall of the ring cylinder above the first sand discharging openings, the rotating ring is rotatably arranged on the annular track, the upper end of the rotating ring is provided with an inner gear ring, a driving motor is arranged on the ring cylinder, and a gear which is in engagement with the inner gear ring is arranged on the driving motor.

3. The automatic, fiber-sanding dust recycler that separates sand according to claim 1, wherein, The feeding device comprises a hopper and an auger conveyor which extends into the interior of the ring cylinder, the hopper is connected with the outer end of the auger conveyor, and the inner end of the auger conveyor is provided with a discharging pipe which is arranged concentrically with the centrifugal spreading cylinder.

4. The automatic, fibered, sand-dusting, dust-recovery machine of separating sand grains according to claim 1, characterized in that, The driving mechanism comprises a support which is fixed on the sand particle collecting hopper and extends into the ring cylinder, a centrifugal motor is arranged on the support, and the motor shaft of the centrifugal motor is connected with the centrifugal spreading cylinder.

5. The automatic, fibered, sand-dusting, dust-recovery machine of separating sand grains according to claim 1, characterized in that, A plurality of filtering openings are uniformly arranged on the outer circular surface of the lower half of the ring cylinder, and a filter screen which covers the filtering openings is arranged on the inner wall of the ring cylinder.

6. The automatic, fibered, sand-dusting, dust-recovery machine of separating sand grains according to claim 5, characterized in that, An accommodation groove which is recessed inwardly is arranged on the outer circular surface of the centrifugal spreading cylinder, a brush strip which is arranged to move radially is connected with the accommodation groove through a spring and a guide rod, and brush hairs which are directed outwardly in the radial direction are arranged on the brush strip.

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