Metal waste sorting system

Abstract

The invention relates to a metal waste sorting system, which belongs to the technical field of metal waste recovery, and comprises a rack, an identification assembly is connected to the rack, the identification assembly comprises an X-ray exciter arranged above the rack, the transmitting end of the X-ray exciter faces the rack, excited characteristic X-rays enter an angular instrument, and the angular instrument is connected with the identification assembly. And the processing unit is in signal connection with the goniometer, the processing unit processes incident angle information by utilizing a Bragg equation to obtain wavelength information of the characteristic X-rays, and then element composition of the metal waste is obtained by utilizing the wavelength information. The metal waste is irradiated and bombarded to excite the characteristic X-rays of different elements, the goniometer and the processing unit are used for obtaining the wavelength information of the characteristic X-rays, the element composition of the metal waste is obtained through the obvious difference of the wavelengths of the different elements, accurate recognition of the metal waste is achieved, and the sorting precision of the metal waste is improved.

Description

Technical Field

[0001] This invention belongs to the field of metal waste recycling technology, specifically relating to a metal waste sorting system. Background Technology

[0002] Currently, methods for sorting and recycling metallic solid waste include magnetic separation, eddy current separation, and air separation. With the development of computer and intelligent technologies, methods with higher sorting accuracy are constantly emerging, such as X-ray photoelectric separators, X-ray radiation separators, color sorters, infrared spectral separators, and Raman spectral separators. These technologies and equipment have improved the sorting accuracy of metallic solid waste. Among them, sorting equipment using X-rays as a light source or signal source has been widely used in the sorting of bulk metallic waste. For example, X-ray photoelectric separators, which use the differences in surface image grayscale resulting from the different absorption of X-rays by different metal samples, can effectively separate coal and gangue. X-ray radiation separators, based on characteristic X-ray energy dispersive spectroscopy analysis technology, calculate elemental content using the energy and intensity of characteristic X-rays to determine mineral types, can sort various metallic minerals.

[0003] The aforementioned method for sorting metals using X-rays can effectively sort various metal solid wastes and minerals. However, its effectiveness is poor for identifying and sorting certain special metals, such as those containing elements with adjacent or similar atomic numbers. Due to the small differences in surface grayscale or energy positions, these metals cannot be effectively identified. This is particularly true for metals containing rare earth elements. Because the energy positions of the characteristic X-rays of rare earth elements are close, the energy position differences of the characteristic X-rays obtained using an EDS spectrometer are small, resulting in low accuracy in sorting based on the energy positions of the characteristic X-rays. ， Meanwhile, the contrast difference between backscattered images of different phase regions composed of different rare earth elements is small, which makes X-ray photoelectric sorting, which uses backscattered images of metal surfaces for image recognition, very difficult. This results in high identification difficulty for sorting using X-rays and low sorting accuracy of metal waste. Summary of the Invention

[0004] In view of this, the present invention provides a metal waste sorting system that utilizes the significant differences in element wavelengths to obtain the elemental composition of metal waste, thereby achieving accurate identification of metal waste and improving the sorting accuracy of metal waste, in order to overcome the shortcomings of the prior art.

[0005] The technical solution of this invention is: a metal waste sorting system, including a frame configured to hold metal waste, an identification component connected to the frame, and an X-ray exciter positioned above the frame with its emitting end facing the frame. The X-ray exciter irradiates the metal waste, exciting characteristic X-rays of different elements in the metal waste. The excited characteristic X-rays enter a goniometer, which measures the incident angle information to obtain the characteristic X-rays. A processing unit is connected to the goniometer signal and processes the incident angle information using Bragg's equation to obtain the wavelength information of the characteristic X-rays. The wavelength information is then used to obtain the elemental composition of the metal waste.

[0006] Preferably, the identification component further includes: a spectrophotometer located on the goniometer, the spectrophotometer being connected to the input optical path of the goniometer, the excited characteristic X-rays entering the spectrophotometer, the spectrophotometer using the spectrophotometer to split the characteristic X-rays according to different wavelengths, and the goniometer measuring the split characteristic X-rays to obtain the incident angle information of characteristic X-rays of different wavelengths.

[0007] Preferably, it further includes: a collimator located on the goniometer, with the input end of the collimator facing the frame and its output end connected to the input optical path of the spectroscopic crystal. The excited characteristic X-rays enter the collimator for parallelization, and the parallelized characteristic X-rays enter the spectroscopic crystal.

[0008] Preferably, it also includes: a counter, which is connected to the output optical path of the goniometer, the characteristic X-rays enter the counter, and the signal intensity of the characteristic X-rays is measured by the counter.

[0009] Preferably, the counter includes a gas flow proportional counter and a scintillation counter, wherein the gas flow proportional counter acquires the signal intensity of characteristic X-rays of light elements, and the scintillation counter acquires the signal intensity of characteristic X-rays of heavy elements.

[0010] Preferably, it also includes: a conveyor belt, which is horizontally connected to the frame and transports metal waste through the conveyor belt; a blower is provided directly below one end of the conveyor belt, with one end of the blower connected to the frame and the other end inclined upward, so as to blow the metal waste away from the conveyor belt through the blower.

[0011] Preferably, it also includes: a material collection trough, which is placed on the ground and located on the side of the blower away from the frame, and a material collection baffle is connected to the side of the material collection trough away from the frame.

[0012] Preferably, a feed hopper is connected to the end of the frame away from the blower. The feed hopper is vertically positioned directly above the conveyor belt. A feed chute is connected to the side of the feed hopper closest to the conveyor belt. The feed chute is inclined downwards.

[0013] Preferably, a vibrator is connected to the feed chute.

[0014] Preferably, a dust collector is connected to the top of the frame, and the dust collector is connected to a fan through a pipe. The output port of the fan is connected to a cyclone separator.

[0015] Compared with existing technologies, the metal waste sorting system provided by this invention emits high-energy X-rays through an X-ray exciter on an identification component on a rack, irradiating and bombarding the metal waste to excite characteristic X-rays of different elements. A goniometer is used to obtain the incident angle information of the characteristic X-rays, and then the wavelength information is obtained through a processing unit. Utilizing the significant differences in element wavelengths, the elemental composition of the metal waste is determined, achieving accurate identification of the metal waste and improving the sorting accuracy. This solves the problem of low accuracy in existing X-ray sorting systems based on EDS analysis and differences in X-ray absorption on the sample surface. The metal waste sorting system of this invention has high accuracy, is easy to use, and is highly practical, making it worthy of widespread promotion. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the sorting system of the present invention;

[0017] Figure 2 This refers to the process of identifying characteristic X-rays. Detailed Implementation

[0018] This invention provides a metal waste sorting system, which is described below in conjunction with... Figures 1 to 2 The present invention will now be described.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Currently, methods for sorting and recycling metallic solid waste include magnetic separation, eddy current separation, and air separation. With the development of computer and intelligent technologies, methods with higher sorting accuracy are constantly emerging, such as X-ray photoelectric separators, X-ray radiation separators, color sorters, infrared spectral separators, and Raman spectral separators. These technologies and equipment have improved the sorting accuracy of metallic solid waste. Among them, sorting equipment using X-rays as a light source or signal source has been widely used in the sorting of bulk metallic waste. For example, X-ray photoelectric separators, which use the differences in surface image grayscale resulting from the different absorption of X-rays by different metal samples, can effectively separate coal and gangue. X-ray radiation separators, based on characteristic X-ray energy dispersive spectroscopy analysis technology, calculate elemental content using the energy and intensity of characteristic X-rays to determine mineral types, can sort various metallic minerals.

[0021] The aforementioned method for sorting metals using X-rays can effectively sort various metal solid wastes and minerals. However, it is less effective at identifying and sorting certain special metals, such as those containing elements with adjacent or similar atomic numbers. Due to the small differences in grayscale or energy positions on the metal surface, effective identification is impossible. This is particularly true for metals containing rare earth elements. The close proximity of the energy positions of characteristic X-rays from rare earth elements results in minimal differences in the energy positions of X-rays obtained using an EDS spectrometer, leading to low accuracy in sorting based on the energy positions of these characteristic X-rays. Furthermore, the small contrast differences in backscattered images of different phase regions composed of different rare earth elements significantly complicate X-ray photoelectric sorting using backscattered images of metal surfaces. This results in high identification difficulty and low sorting accuracy for metal waste.

[0022] To address the aforementioned issues, this invention provides a metal waste sorting system that uses an X-ray exciter on a rack to emit high-energy X-rays, irradiating and bombarding the metal waste to excite characteristic X-rays of different elements. A goniometer is used to obtain the incident angle information of the characteristic X-rays, and then a processing unit obtains the wavelength information. By utilizing the significant differences in element wavelengths, the elemental composition of the metal waste is determined, achieving accurate identification of the metal waste and improving the sorting accuracy. This solves the problem of low sorting accuracy in existing X-ray sorting systems based on EDS analysis and differences in X-ray absorption on sample surfaces.

[0023] As shown in the figure Figure 1This is a schematic diagram of the sorting system in this embodiment. A metal waste sorting system includes a frame 11 on which metal waste is placed. An identification component is connected to the frame 11. The identification component includes an X-ray exciter 41 disposed above the frame 11, with the emitting end of the X-ray exciter 41 facing the frame 11. The light source of the X-ray exciter 41 is a high-energy electron beam emitted by an electron gun or high-energy X-rays emitted by an X-ray tube. The metal waste is irradiated by the X-ray exciter 41, exciting characteristic X-rays of different elements in the metal waste. The characteristic X-rays excited by the goniometer 44 enter the goniometer 44, and the goniometer 44 measures the characteristic X-rays to obtain the incident angle information. A processing unit is signal-connected to the goniometer 44. The processing unit processes the incident angle information using the Bragg equation to obtain the wavelength information of the characteristic X-rays, and then uses the wavelength information to obtain the elemental composition of the metal waste.

[0024] The Bragg equation is: 2dsinθ=nλ, where d is the interplanar spacing, θ is the incident angle, λ is the wavelength of the X-ray, and n is the diffraction order, n=1,2….

[0025] The X-ray exciter 41 irradiates the surface of the metal waste, and the incident angle information is obtained by measuring the characteristic X-rays through the goniometer 44. Then, the wavelength of the characteristic X-rays of different elements is obtained, and compared with the wavelength position and count rate of the peak position of the characteristic X-rays of the corresponding elements in the database to obtain the elemental composition of the metal waste, which can accurately identify the metal waste.

[0026] As shown in the figure Figure 2 For the identification process of characteristic X-rays in this example, preferably, the identification component further includes: a spectroscopic crystal, which is located on the goniometer 44. The spectroscopic crystal is connected to the input optical path of the goniometer 44. The excited characteristic X-rays enter the spectroscopic crystal, and the spectroscopic crystal splits the characteristic X-rays according to different wavelengths. The goniometer 44 measures the split characteristic X-rays to obtain the incident angle information of characteristic X-rays of different wavelengths.

[0027] This embodiment utilizes a spectroscopic crystal to split the excited characteristic X-rays into multiple rays according to different wavelengths, thereby improving the accuracy of the goniometer 44 in detecting the incident angle information.

[0028] Preferably, it also includes: a collimator located on the goniometer 44, with the input end of the collimator facing the frame 11 and its output end connected to the input optical path of the beam splitter. The excited characteristic X-rays enter the collimator for parallelization, and the parallelized characteristic X-rays enter the beam splitter to improve the beam splitter's beam splitting effect.

[0029] Preferably, it also includes: a counter, which is connected to the output optical path of the goniometer 44, and the characteristic X-ray enters the counter to measure the signal intensity of the characteristic X-ray.

[0030] This embodiment utilizes the significant differences in characteristic X-ray wavelengths of different elements, obtains the signal intensity of characteristic X-rays of different elements through a counter, and combines the wavelength and signal intensity information of characteristic X-rays to accurately identify the elements in metal waste.

[0031] Preferably, the counter includes a gas flow proportional counter and a scintillation counter, wherein the gas flow proportional counter acquires the signal intensity of characteristic X-rays of light elements, and the scintillation counter acquires the signal intensity of characteristic X-rays of heavy elements.

[0032] Preferably, it also includes: a conveyor belt 12, which is horizontally connected to the frame 11 and transports metal waste through the conveyor belt 12. A blower 52 is provided directly below one end of the conveyor belt 12. One end of the blower 52 is connected to the frame 11, and the other end is inclined upward. The blower 52 blows the metal waste to the side away from the conveyor belt 12.

[0033] Preferably, it also includes: a material collection trough 61, which is placed on the ground and located on the side of the blower 52 away from the frame 11. A material collection baffle 62 is connected to the side of the material collection trough 61 away from the frame 11.

[0034] Preferably, the end of the frame 11 away from the blower 52 is connected to a feed hopper 21, the feed hopper 21 is vertically positioned directly above the conveyor belt 12, and the side of the feed hopper 21 near the conveyor belt 12 is connected to a feeding chute 24, which is inclined downwards.

[0035] Preferably, a vibrator 22 is connected to the feed chute 24.

[0036] Preferably, a dust collector 31 is connected to the top of the frame 11, and the dust collector 31 is connected to a fan 32 through a pipe. The output port of the fan 32 is connected to a cyclone separator 35.

[0037] In the process of sorting metal waste, it is necessary to improve the sorting efficiency.

[0038] Therefore, this embodiment provides a solution, preferably further including: a conveyor belt 12, which is horizontally connected to the frame 11 and transports metal waste through the conveyor belt 12. A blower 52 is provided directly below one end of the conveyor belt 12. One end of the blower 52 is connected to the frame 11, and the other end is inclined upward. The blower 52 blows the metal waste away from the conveyor belt 12.

[0039] In this embodiment, the conveyor belt 12 is used in conjunction with the separation mechanism to allow metal waste to continuously pass through the identification component. After the metal waste is identified, the separation mechanism separates the target metal waste.

[0040] In this embodiment, the angle measuring instrument 44 calculates the wavelength of the received characteristic X-ray information and compares it with the wavelength position and count rate of the peak position of the characteristic X-ray of the corresponding element in the database. After the comparison matches, the target sample is located, and the sample location information and action command are sent to the separation mechanism. The target metal waste is blown apart by the blower 52 for separation.

[0041] Preferably, it also includes: a material collection trough 61, which is placed on the ground and located on the side of the blower 52 away from the frame 11. A material collection baffle 62 is connected to the side of the material collection trough 61 away from the frame 11.

[0042] In this embodiment, the collection trough 61 is used in conjunction with the blower 52 to blow the target metal waste into the collection trough 61. The collection baffle 62 allows the target metal waste to enter the collection trough 61 smoothly, thereby achieving the purpose of sorting metal waste with different elemental compositions.

[0043] Preferably, the end of the frame 11 away from the blower 52 is connected to a feed hopper 21, the feed hopper 21 is vertically positioned directly above the conveyor belt 12, and the side of the feed hopper 21 near the conveyor belt 12 is connected to a feeding chute 24, which is inclined downwards.

[0044] In this embodiment, the metal waste enters the feeding chute 24 through the feeding funnel 21. The feeding funnel and the feeding chute are connected by a hose. The surface of the feeding chute 24 has several guide plates. Through the guide plates and vibration feeding, the sample can be fed evenly and continuously onto the conveyor belt without sample overlap.

[0045] Preferably, a vibrator 22 is connected to the feeding chute 24. The vibrator 22 is a high-frequency vibration motor, which can shake the metal waste to be sorted onto the conveyor belt.

[0046] After the metal waste falls onto the conveyor belt, the large amount of dust on its surface can interfere with the characteristic X-ray excitation and identification process of the identification components.

[0047] Therefore, this embodiment proposes a solution. Preferably, a dust collector 31 is connected directly above the frame 11, and the dust collector 31 is connected to a fan 32 through a pipe. The output port of the fan 32 is connected to a cyclone separator 35.

[0048] In this embodiment, negative pressure dust removal is achieved through the fan 32 and the dust collector 31 to remove dust from the surface of the metal waste on the conveyor belt, avoiding interference with the characteristic X-ray excitation and identification process. Then, the dust is separated by the cyclone separator 35.

[0049] In the metal waste sorting system of the present invention, when in use, blocky metal waste falls through the feed funnel and feed chute and is spread flat on the conveyor belt. The dust generated is removed by the fan 32 and the dust collector 31. When the sample is conveyed to a specific position, the X-ray tube emits high-energy X-rays, or the electron gun emits high-energy electron beams to irradiate the sample. Different elements in the sample will produce characteristic X-rays. All elemental characteristic X-rays enter the collimator for parallelization. The parallelized characteristic X-rays enter the spectrometer, which separates all characteristic X-rays. The different wavelengths of characteristic X-rays after separation are detected by the goniometer. The characteristic X-rays then enter the counter, which collects the signal intensity of the characteristic X-rays.

[0050] Finally, all signals are processed by a computer system, which determines whether the target element exists based on whether there is a signal at a specific wavelength position, i.e. whether a spectral peak appears. When the target element exists, the corresponding metal waste is blown out by a blower into the corresponding collection tank, thereby achieving the purpose of sorting metal waste composed of different elements.

[0051] This invention identifies and sorts the collection trough based on the characteristic X-rays of different elements, and is highly adaptable to the sorting of metal waste and other blocky solid wastes, enabling safe, continuous, rapid, efficient and environmentally friendly recycling of various solid wastes.

[0052] The metal waste sorting system of the present invention, when used for the specific application of shredded waste automobile products, includes the following steps:

[0053] 1. Place the waste automobile crushed products (30-50mm particle size) containing magnesium alloy and aluminum alloy into the feed hopper. Use a vibrator to distribute the material through the guide plate of the feed chute. The material falls evenly onto the conveyor belt. The dust collector and the fan work together to suck away the dust on the metal waste and the dust raised, so as to prevent it from affecting the element identification process of the subsequent samples.

[0054] 2. When the material moves to the bottom of the identification component, the X-ray exciter irradiates the surface of the waste car crushed product. The characteristic X-rays of the elements contained in the surface of the waste car crushed product are excited. Different elements in the waste car crushed product will produce characteristic X-rays. All element characteristic X-rays enter the collimator for parallelization. The parallelized characteristic X-rays enter the spectrometer, which splits all characteristic X-rays. The characteristic X-rays of different wavelengths after splitting pass through the goniometer. The wavelength of the characteristic X-ray is calculated according to Bragg's law. The characteristic X-ray then enters the counter to obtain the signal intensity at the wavelength position.

[0055] 3. The aforementioned characteristic X-ray information is transmitted to the goniometer. It is compared with the location of the characteristic X-ray Ka-line of aluminum in the database (8.3393 Å). If the intensity ratio of the Ka-line peak height to the background signal at this location is ≥3, the fragmented car product is confirmed to be an aluminum alloy. The system also compares the location of the characteristic X-ray Ka-line of magnesium in the database (9.8900 Å). If the intensity ratio of the Ka-line peak height to the background signal at this location is ≥3, the sample is confirmed to be a magnesium alloy. The goniometer locates the target object and transmits the location information to the blower.

[0056] 4. During the process of the object leaving the conveyor belt and falling, the blower blows the target object and discharges the target object to the corresponding position in the collection trough 61, thereby achieving the purpose of selecting aluminum alloy or magnesium alloy samples.

[0057] When the metal waste sorting system of the present invention is specifically used for the glass products after the breakage of discarded old television sets, it includes the following steps:

[0058] 1. Place the glass products (30-50mm particle size) from the crushed waste old TV set into the feeding funnel. Some of the glass contains lead and some does not. Use a vibrator to distribute the material through the guide plate of the feeding chute. The material falls evenly onto the conveyor belt. The dust collector and fan work together to suck away the dust on the metal waste and the dust that is raised, so as to prevent it from affecting the element identification process of the subsequent samples.

[0059] 2. When the material moves to the bottom of the identification component, the X-ray exciter irradiates the surface of the glass product after the waste old TV set is broken. The characteristic X-rays of the elements contained in the glass product after the waste old TV set are excited. Different elements in the glass product after the waste old TV set will produce characteristic X-rays. All element characteristic X-rays enter the collimator for parallelization. The parallelized characteristic X-rays enter the spectrometer, which splits all characteristic X-rays. The characteristic X-rays of different wavelengths after splitting pass through the goniometer. The wavelength of the characteristic X-ray is calculated according to Bragg's law. The characteristic X-ray then enters the counter to obtain the signal intensity at the wavelength position.

[0060] 3. The above-mentioned characteristic X-ray information is transmitted to the goniometer. The system compares the position of the characteristic X-ray Ka spectral line of lead in the database at 5.2860 Å. When the intensity ratio of the peak height of the Ka spectral line of lead to the background signal at this position is ≥3, the sample is confirmed to be lead-containing glass. The goniometer locates the target sample and transmits the location information to the blower.

[0061] 4. During the process of the object leaving the conveyor belt and falling, the high-pressure air jetting system 52 performs a jetting action on the corresponding sample, discharging the lead-containing glass to the corresponding position in the collection tank 61, thereby achieving the purpose of selecting the lead-containing glass.

[0062] The above-disclosed embodiments are merely preferred embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A metal waste sorting system, characterized in that, include: A rack (11) is configured to hold metal scrap; An identification component is connected to the rack (11), the identification component comprising: An X-ray exciter (41) is disposed above the frame (11), with the emitting end of the X-ray exciter (41) facing the frame (11). The metal waste is irradiated by the X-ray exciter (41) to excite the characteristic X-rays of different elements in the metal waste. The goniometer (44) is used to measure the incident angle information of the characteristic X-rays. The processing unit is connected to the goniometer (44) by signal. The processing unit processes the incident angle information using the Bragg equation to obtain the wavelength information of the characteristic X-rays, and then uses the wavelength information to obtain the elemental composition of the metal waste.

2. The metal waste sorting system according to claim 1, characterized in that, The identification component further includes a spectrophotometer located on the goniometer (44). The spectrophotometer is connected to the input optical path of the goniometer (44). Excited characteristic X-rays enter the spectrophotometer, and the spectrophotometer splits the characteristic X-rays according to different wavelengths. The goniometer (44) measures the split characteristic X-rays to obtain the incident angle information of characteristic X-rays of different wavelengths.

3. The metal waste sorting system according to claim 2, characterized in that, Also includes: The collimator is located on the goniometer (44). The input end of the collimator faces the frame (11), and its output end is connected to the input optical path of the spectrometer. The excited characteristic X-rays enter the collimator to be parallelized, and the parallelized characteristic X-rays enter the spectrometer.

4. The metal waste sorting system according to claim 1, characterized in that, Also includes: The counter is connected to the output optical path of the goniometer (44). The characteristic X-ray enters the counter and the signal intensity of the characteristic X-ray is measured by the counter.

5. The metal waste sorting system according to claim 4, characterized in that, The counter includes a gas flow proportional counter and a scintillation counter. The gas flow proportional counter is used to collect the signal intensity of characteristic X-rays of light elements, and the scintillation counter is used to collect the signal intensity of characteristic X-rays of heavy elements.

6. The metal waste sorting system according to claim 1, characterized in that, Also includes: A conveyor belt (12) is horizontally connected to the frame (11) to transport metal waste. A blower (52) is provided directly below one end of the conveyor belt (12). One end of the blower (52) is connected to the frame (11), and the other end is inclined upward. The blower (52) blows the metal waste away from the conveyor belt (12).

7. The metal waste sorting system according to claim 6, characterized in that, Also includes: A material collection trough (61) is placed on the ground. The material collection trough (61) is located on the side of the blower (52) away from the frame (11). A material collection baffle (62) is connected to the side of the material collection trough (61) away from the frame (11).

8. The metal waste sorting system according to claim 6, characterized in that, The end of the frame (11) away from the blower (52) is connected to a feed hopper (21). The feed hopper (21) is vertically arranged directly above the conveyor belt (12). The side of the feed hopper (21) close to the conveyor belt (12) is connected to a feeding chute (24). The feeding chute (24) is inclined downward.

9. The metal waste sorting system according to claim 8, characterized in that, A vibrator (22) is connected to the feeding chute (24).

10. The metal waste sorting system according to claim 1, characterized in that, A dust collector (31) is connected directly above the frame (11), and the dust collector (31) is connected to a fan (32) through a pipe. The output port of the fan (32) is connected to a cyclone separator (35).

Images