Small-flow cyclone type cutting device

Abstract

The utility model relates to the technical field of gas cyclone cutting equipment, and provides a small-flow cyclone type cutting device which comprises a cutting body, a large particle collecting body and a small particle collecting body, an air inlet channel and a conical cutting cavity which are communicated are arranged in the cutting body, and the air inlet channel is arranged in the tangential direction of the conical cutting cavity. The large particle collecting body is rotationally arranged at the small-diameter end of the conical cutting cavity, the small particle collecting body is arranged at the large-diameter end of the conical cutting cavity, a containing groove is formed in the inner wall of the conical cutting cavity, the scraping plate is slidably arranged in the containing groove, the scraping plate is used for being in smooth transition with the inner wall of the conical cutting cavity after sliding into the containing groove, and the scraping plate is used for being in smooth transition with the inner wall of the conical cutting cavity after sliding out of the containing groove. And the cleaning device is used for cleaning the inner wall of the conical cutting cavity under the driving of rotation of the large particle collecting body. By means of the technical scheme, the problems that time and labor are wasted and efficiency is low when a cutter is manually cleaned in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas cyclone cutting equipment, in particular to a small flow cyclone type cutting device. Background Art

[0002] In the field of atmospheric monitoring technology, PM2.5 refers to atmospheric particles with an aerodynamic diameter less than or equal to 2.5μm. Compared with PM10 and coarser atmospheric particles, PM2.5 has a smaller particle size, is rich in a large number of toxic and harmful substances, and has a longer residence time in the atmosphere and a longer transport distance, thus having a greater impact on human health and atmospheric environmental quality. In addition to affecting human health, PM2.5 has multiple hazards. It can form haze, reduce visibility, and damage the ecological environment.

[0003] The current PM2.5 automatic monitoring equipment mainly uses a medium-flow cyclone cutter, which needs to be cleaned regularly, otherwise it will affect the cutting efficiency and thus the accuracy of the data. Most of the existing methods for cleaning the cutter require the dust chamber to be removed to expose the inside of the cutter, and then the inner wall of the cutter is manually cleaned, which is time-consuming and labor-intensive, and has low cleaning efficiency. In response to the emergence of the above problems, the existing technology has not solved them well, which has brought troubles to the normal operation of work in this field. Therefore, there is an urgent need for a small-flow cyclone cutting device to solve the above problems. Utility Model Content

[0004] The utility model provides a small flow cyclone type cutting device, which solves the problem of time-consuming, labor-intensive and low efficiency of manual cleaning of a cutting device in the related art.

[0005] The technical solution of the utility model is as follows: a small flow cyclone cutting device, comprising a cutting body, a large particle collecting body, and a small particle collecting body, wherein the cutting body has a connected air inlet channel and a conical cutting cavity, wherein the air inlet channel is arranged along the tangential direction of the conical cutting cavity, the large particle collecting body is rotatably arranged at the small diameter end of the conical cutting cavity, and the small particle collecting body is arranged at the large diameter end of the conical cutting cavity,

[0006] It also includes a scraper, the inner wall of the conical cutting chamber has a receiving groove, the scraper is slidably arranged in the receiving groove, after the scraper slides into the receiving groove, it is used to smoothly transition with the inner wall of the conical cutting chamber, after the scraper slides out of the receiving groove, it is used to clean the inner wall of the conical cutting chamber driven by the rotation of the large particle collecting body.

[0007] Optionally, it also includes a pressing portion and a spring. The large particle collecting body is provided with a sliding groove, the scraper is located in the sliding groove, the pressing portion is arranged on the scraper, and the two ends of the spring act on the inner wall of the sliding groove and the scraper respectively, so as to provide force for the scraper to slide into the receiving groove.

[0008] Optionally, the cutting body is provided with a mounting groove at the small diameter end of the conical cutting cavity, the large particle collecting body is rotatably arranged in the mounting groove, and also includes a sealing ring 1 and a spring 2. The end face of the large particle collecting body has an annular groove, the sealing ring 1 is axially slidable in the annular groove, and the two ends of the spring 2 act on the annular groove and the sealing ring 1 respectively, for providing a force for the sealing ring 1 to approach the bottom wall of the mounting groove.

[0009] Optionally, it also includes a shovel portion, which is arranged on the scraper. After the shovel portion slides radially under the drive of the scraper, it is used to scoop up the sealing ring from the bottom wall of the installation groove or cancel the scooping.

[0010] Optionally, it also includes a block and a spring three, wherein the block is radially slidably arranged on the large particle collecting body, and two ends of the spring three act on the block and the large particle collecting body respectively, so as to provide a force for the block to slide radially outward, and an annular groove is provided on the inner side wall of the mounting groove, and the block enters or leaves the annular groove after sliding.

[0011] Optionally, a sliding ring is further included, which is axially slidably arranged on the large particle collecting body. After the sliding ring slides, it is used to squeeze the block inward or cancel squeezing.

[0012] Optionally, the small particle collecting body is threadedly connected to the large diameter end of the conical cutting chamber, the small particle collecting body is provided with a small particle channel, the small particle channel is connected to the large diameter end of the conical cutting chamber, the large particle collecting body is provided with a dust collecting chamber, the dust collecting chamber is connected to the small diameter end of the conical cutting chamber.

[0013] Optionally, the small particle collector further has an air outlet channel, the air outlet channel is communicated with the small particle channel, and the air outlet channel is used to connect to a sampling tube.

[0014] Optionally, a second sealing ring is provided on the inner wall of the air outlet channel.

[0015] Optionally, it also includes a scraping part, which is arranged on the outward end surface of the scraper, and the scraping part is one of a rubber strip, a sponge and a non-woven fabric.

[0016] The working principle and beneficial effects of the utility model are:

[0017] In this embodiment, when the device is working, the gas containing particles enters the conical cutting chamber from the air inlet channel. Because the air inlet channel is arranged along the tangential direction of the conical cutting chamber, the gas containing particles will flow in at high speed along the tangential direction and then advance in the conical cutting chamber in a spiral direction, generating a rotating airflow. Under the action of centrifugal force, the swirl will throw large particles in the gas onto the inner wall of the conical cutting chamber and continue to move forward, so that the speed gradually decreases. After the large particles collide with the inner wall of the conical cutting chamber, they lose their ability to move forward and fall into the large particle collection body, while the airflow will carry small particles into the small particle collection body, thereby achieving the separation of large and small particles.

[0018] When it is necessary to clean the inner wall of the conical cutting chamber, first slide the scraper out of the receiving slot, and then just rotate the large particle collector to drive the scraper to rotate. The side of the scraper will scrape off the dust on the inner wall of the conical cutting chamber, and the scraper will push the dust into the receiving slot when it rotates. After cleaning, the scraper can be reset to the receiving slot. The equipment only needs to clean the receiving slot periodically, which greatly reduces the difficulty of cleaning. When the equipment is working normally, the scraper is located in the receiving slot, and the scraper and the inner wall of the conical cutting chamber have a smooth transition, which will not affect the normal airflow cutting. When it is necessary to clean the conical cutting chamber, the scraper slides out of the receiving slot. Driven by the rotation of the large particle collector, the bottom of the scraper can just scrape the inner wall of the conical cutting chamber to achieve the cleaning effect. This equipment achieves the cleaning effect without disassembling the large particle collector, which greatly improves the cleaning efficiency.

[0019] This equipment is mainly used for small flow conditions of about 2 liters per minute. Due to the small flow rate, it has the advantages of long maintenance cycle and small maintenance workload. At the same time, the matching sampling system has low requirements and is suitable for outdoor equipment. It can be adapted to portable and vehicle-mounted particle detectors, light scattering particle monitors, particle size spectrum monitors and black carbon monitors, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0021] Figure 1 It is a schematic diagram of the internal structure of a small flow cyclone cutting device;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a schematic diagram of the structure of the large particle collector of the utility model;

[0024] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0025] Figure 5 It is a schematic diagram of the structure of the cutting body in the utility model;

[0026] Figure 6 It is a side schematic diagram of a small flow cyclone cutting device;

[0027] Figure 7 This is a schematic diagram of the back side of a small flow cyclone cutting device.

[0028] In the figure: 1. cutting body, 2. large particle collecting body, 3. small particle collecting body, 4. air inlet channel, 5. conical cutting chamber, 6. scraper, 7. receiving groove, 8. pressing part, 9. spring one, 10. sliding groove, 11. mounting groove, 12. sealing ring one, 13. spring two, 14. annular groove, 15. shovel part, 16. block, 17. spring three, 18. annular groove, 19. sliding ring, 20. small particle channel, 21. dust collecting chamber, 22. air outlet channel, 23. sealing ring two, 24. scraper part. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0030] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0031] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0032] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0033] Reference Figure 1 to Figure 7 , which is the first embodiment of the utility model, proposes a small flow cyclone cutting device, including a cutting body 1, a large particle collecting body 2, and a small particle collecting body 3. The cutting body 1 has a connected air inlet channel 4 and a conical cutting chamber 5. The air inlet channel 4 is arranged along the tangential direction of the conical cutting chamber 5. The large particle collecting body 2 is rotatably arranged at the small diameter end of the conical cutting chamber 5, and the small particle collecting body 3 is arranged at the large diameter end of the conical cutting chamber 5.

[0034] It also includes a scraper 6, and the inner wall of the conical cutting chamber 5 has a receiving groove 7. The scraper 6 is slidably arranged in the receiving groove 7. After the scraper 6 slides into the receiving groove 7, it is used to smoothly transition with the inner wall of the conical cutting chamber 5. After the scraper 6 slides out of the receiving groove 7, it is used to clean the inner wall of the conical cutting chamber 5 driven by the rotation of the large particle collecting body 2.

[0035] In this embodiment, when the device is working, the gas containing particles enters the conical cutting chamber 5 from the air inlet channel 4. Because the air inlet channel 4 is arranged along the tangential direction of the conical cutting chamber 5, the gas containing particles will flow in at high speed along the tangential direction, and will move forward in the direction of a spiral line through the conical cutting chamber 5, generating a rotating airflow. Under the action of centrifugal force, the swirl will throw large particles in the gas onto the inner wall of the conical cutting chamber 5, and continue to move forward, so that the speed gradually decreases. After the large particles collide with the inner wall of the conical cutting chamber 5, they lose the ability to move forward and fall into the large particle collection body 2, while the airflow will carry small particles into the small particle collection body 3, thereby achieving the separation of large and small particles.

[0036] When it is necessary to clean the inner wall of the conical cutting chamber 5, first slide the scraper 6 out of the receiving slot 7, and then just rotate the large particle collector 2 to drive the scraper 6 to rotate. The side of the scraper 6 will scrape off the dust on the inner wall of the conical cutting chamber 5. When the scraper 6 rotates, it will push the dust into the receiving slot 7. After the cleaning is completed, the scraper 6 is reset to the receiving slot 7. The equipment only needs to clean the receiving slot 7 periodically, which greatly reduces the difficulty of cleaning. When the equipment is working normally, the scraper 6 is located in the receiving slot 7, and the scraper 6 and the inner wall of the conical cutting chamber 5 have a smooth transition, which will not affect the normal progress of the airflow cutting. When it is necessary to clean the conical cutting chamber 5, the scraper 6 slides out of the receiving slot 7. Driven by the rotation of the large particle collector 2, the bottom of the scraper 6 can just scrape the inner wall of the conical cutting chamber 5 to achieve the cleaning effect. This embodiment achieves the cleaning effect without disassembling the large particle collector 2, which greatly improves the cleaning efficiency.

[0037] This equipment is mainly used for small flow conditions of about 2 liters per minute. Due to the small flow rate, it has the advantages of long maintenance cycle and small maintenance workload. At the same time, the matching sampling system has low requirements and is suitable for outdoor equipment. It can be adapted to portable and vehicle-mounted particle detectors, light scattering particle monitors, particle size spectrum monitors and black carbon monitors, and has a wide range of applications.

[0038] It also includes a pressing portion 8 and a spring 9. The large particle collecting body 2 is provided with a sliding groove 10. The scraper 6 is located in the sliding groove 10. The pressing portion 8 is arranged on the scraper 6. The two ends of the spring 9 act on the inner wall of the sliding groove 10 and the scraper 6 respectively, so as to provide a force for the scraper 6 to slide into the receiving groove 7.

[0039] In this embodiment, a sliding groove 10 is radially provided on the large particle collector 2, and the scraper 6 is slidably arranged in the sliding groove 10, providing radial limit for the sliding of the scraper 6, and ensuring the smoothness of the sliding of the scraper 6. The sliding groove 10 is connected to the outside, and the pressing portion 8 is extended out of the sliding groove 10, and the pressing portion 8 can be easily contacted from the outside of the large particle collector 2. When the scraper 6 needs to slide out of the receiving groove 7, the pressing portion 8 is pressed inward to provide the force of the compression spring 9, so that the scraper 6 can slide out of the receiving groove 7, and then the large particle collector 2 is manually rotated to drive the scraper 6 to rotate, thereby scraping the dust on the inner wall of the conical cutting chamber 5 to the bottom of the receiving groove 7. After the cleaning is completed, the large particle collector 2 is rotated to drive the scraper 6, so that the scraper 6 is above the receiving groove 7, and then the pressing portion 8 is released, and the scraper 6 is reset to the receiving groove 7 under the action of the elastic force of the spring 9, and the gas cutting can be continued.

[0040] The cutting body 1 is provided with a mounting groove 11 at the small diameter end of the conical cutting cavity 5, the large particle collecting body 2 is rotatably arranged in the mounting groove 11, and also includes a sealing ring 12 and a spring 13. The end face of the large particle collecting body 2 has an annular groove 14, the sealing ring 12 is axially slidable in the annular groove 14, and the two ends of the spring 13 act on the annular groove 14 and the sealing ring 12 respectively, so as to provide a force for the sealing ring 12 to approach the bottom wall of the mounting groove 11.

[0041] In this embodiment, in order to facilitate the installation of the large particle collector 2, a mounting groove 11 is provided at the small diameter end of the conical cutting chamber 5, and the large particle collector 2 is rotatably arranged in the mounting groove 11. In addition, in order to ensure the sealing of the conical cutting chamber 5 during operation, a sealing structure is also provided, which includes an annular groove 14 provided on the end face of the large particle collector 2 and a sealing ring 12 axially slidably provided in the annular groove 14, the sealing ring 12 abuts against the bottom wall of the mounting groove 11, and plays the role of sealing the conical cutting chamber 5. In addition, in order to ensure that the sealing ring 12 fully abuts against the bottom wall of the mounting groove 11, a spring 2 13 is also provided in the annular groove 14, and the spring 2 13 provides a force for the sealing ring 12 to abut against the bottom wall of the mounting groove 11.

[0042] It also includes a shovel portion 15, which is arranged on the scraper 6. After the shovel portion 15 slides radially under the drive of the scraper 6, it is used to scoop up the sealing ring 12 from the bottom wall of the installation groove 11 or cancel the scooping.

[0043] In this embodiment, in order to ensure a good sealing effect, the sealing ring 12 is made of rubber material. When the large particle collector 2 is rotated, the friction between the large particle collector 2 and the bottom wall of the installation groove 11 is large due to the close contact between the sealing ring 12 and the bottom wall of the installation groove 11, which makes it difficult for the large particle collector 2 to rotate. Because the equipment is in a stopped working state during the cleaning work, it is not necessary to ensure extremely high sealing performance, so the shovel part 15 can be driven by the inward sliding action of the scraper 6. The shovel part 15 will enter the gap between the sealing ring 12 and the bottom wall of the installation groove 11, provide the force of the compression spring 2 13, so as to scoop up the sealing ring 12, release the tight relationship between the sealing ring 12 and the bottom wall of the installation groove 11, and then the large particle collector 2 can be rotated.

[0044] It also includes a block 16 and a spring 17. The block 16 is radially slidable on the large particle collector 2. Both ends of the spring 17 act on the block 16 and the large particle collector 2 respectively to provide a force for the block 16 to slide radially outward. An annular groove 18 is provided on the inner side wall of the mounting groove 11. After the block 16 slides, it enters or leaves the annular groove 18.

[0045] In this embodiment, in order to facilitate the installation and rotation of the large particle collector 2, an annular groove 18 is provided on the inner side wall of the installation groove 11, and a plurality of blocks 16 are radially slidably provided on the side of the large particle collector 2. When the large particle collector 2 needs to be installed, the block 16 is first squeezed inward to compress the spring three 17, and then the large particle collector 2 is inserted into the installation groove 11. After the block 16 reaches the position corresponding to the annular groove 18, the block 16 is released, and under the action of the elastic force of the spring three 17, the block 16 enters the annular groove 18 to achieve the installation of the large particle collector 2. When in a normal state, the scraper 6 is located in the receiving groove 7, providing a limiting effect for the large particle collector 2, and the large particle collector 2 cannot rotate at this time; when cleaning work is required, the scraper 6 slides out of the receiving groove 7, and the large particle collector 2 loses the limit and can be rotated. During rotation, the block 16 moves in the annular groove 18 to provide axial limit.

[0046] It also includes a sliding ring 19, which is axially slidably arranged on the large particle collecting body 2. After the sliding ring 19 slides, it is used to squeeze the block 16 inwardly or cancel squeezing.

[0047] In this embodiment, in order to facilitate the simultaneous inward extrusion of multiple blocks 16, a sliding ring 19 is also sleeved on the large particle collector 2. The sliding ring 19 and the block 16 have matching inclined surfaces. When the sliding ring 19 slides in the direction close to the block 16, the compression between the inclined surfaces provides the force of the compression spring three 17, so that the multiple blocks 16 can slide inward synchronously. At this time, the large particle collector 2 can be inserted into the installation groove 11. When the sliding ring 19 slides in the direction away from the block 16, the elastic force of the spring three 17 can be used to make the block 16 slide outward to achieve the engagement with the annular groove 18.

[0048] The small particle collecting body 3 is threadedly connected to the large diameter end of the conical cutting chamber 5, and a small particle channel 20 is provided in the small particle collecting body 3, and the small particle channel 20 is communicated with the large diameter end of the conical cutting chamber 5; the large particle collecting body 2 is provided with a dust collecting chamber 21, and the dust collecting chamber 21 is communicated with the small diameter end of the conical cutting chamber 5.

[0049] In this embodiment, the small particle collector 3 is threadedly connected to the large diameter end of the conical cutting chamber 5, and the small particle channel 20 in the small particle collector 3 is connected to the large diameter end of the conical cutting chamber 5 to collect the gas after the large particles are separated. The dust collecting chamber 21 in the large particle collector 2 is connected to the small diameter end of the conical cutting chamber 5 to collect the separated large particles.

[0050] The small particle collector 3 also has an air outlet channel 22 therein, and the air outlet channel 22 is communicated with the small particle channel 20 , and the air outlet channel 22 is used to connect to a sampling tube.

[0051] The inner wall of the air outlet channel 22 is provided with a second sealing ring 23 .

[0052] In this embodiment, the small particle collecting body 3 has an air outlet channel 22, and the air outlet channel 22 is connected with the small particle channel 20 in a vertical direction. The air outlet channel 22 is used to connect with the sampling tube, and can directly transport the collected gas samples to the sampling tube. In order to ensure the sealing of the air outlet channel 22, a plurality of sealing rings 23 are also provided on the inner wall of the air outlet channel 22 to prevent leakage of the collected gas samples.

[0053] It also includes a scraping portion 24, which is arranged on the outward end surface of the scraper 6, and the scraping portion 24 is one of a rubber strip, a sponge and a non-woven fabric.

[0054] In this embodiment, in order to improve the scraping effect of the scraper 6, a scraping portion 24 is further provided on the outward end surface of the scraper 6, and after the scraper 6 slides out of the receiving groove 7, this end surface faces the inner wall of the conical cutting cavity 5. After the large particle collector 2 drives the scraper 6 to rotate, the scraping portion 24 contacts the inner wall of the conical cutting cavity 5. The scraping portion 24 is preferably made of a flexible material such as a rubber strip, sponge or non-woven fabric, which improves the scraping effect and avoids scratching the inner wall of the conical cutting cavity 5.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A small flow cyclone cutting device, characterized in that: The invention comprises a cutting body (1), a large particle collecting body (2), and a small particle collecting body (3); the cutting body (1) has an air inlet passage (4) and a conical cutting chamber (5) in communication; the air inlet passage (4) is arranged along the tangent direction of the conical cutting chamber (5); the large particle collecting body (2) is rotatably arranged at the small diameter end of the conical cutting chamber (5); the small particle collecting body (3) is arranged at the large diameter end of the conical cutting chamber (5); The invention also comprises a scraper (6), the inner wall of the conical cutting chamber (5) has a receiving groove (7), the scraper (6) is slidably arranged in the receiving groove (7), and after the scraper (6) slides into the receiving groove (7), it is used to smoothly transition with the inner wall of the conical cutting chamber (5), and after the scraper (6) slides out of the receiving groove (7), it is used to clean the inner wall of the conical cutting chamber (5) under the drive of the rotation of the large particle collecting body (2).

2. A small flow cyclone cutting device according to claim 1, characterized in that: It also includes a pressing portion (8) and a spring (9), the large particle collector (2) having a sliding groove (10), the scraper (6) being located in the sliding groove (10), the pressing portion (8) being arranged on the scraper (6), and the two ends of the spring (9) acting on the inner wall of the sliding groove (10) and the scraper (6) respectively, so as to provide a force for the scraper (6) to slide into the receiving groove (7).

3. A small flow cyclone cutting device according to claim 2, characterized in that: The cutting body (1) is provided with a mounting groove (11) at the small diameter end of the conical cutting cavity (5); the large particle collecting body (2) is rotatably arranged in the mounting groove (11); and further comprises a sealing ring (12) and a spring (13); the end surface of the large particle collecting body (2) is provided with an annular groove (14); the sealing ring (12) is axially slidably arranged in the annular groove (14); two ends of the spring (13) act on the annular groove (14) and the sealing ring (12) respectively, so as to provide a force for the sealing ring (12) to approach the bottom wall of the mounting groove (11).

4. A small flow cyclone cutting device according to claim 3, characterized in that: It also includes a shovel portion (15), which is arranged on the scraper (6). After the shovel portion (15) slides radially under the drive of the scraper (6), it is used to scoop up the sealing ring 1 (12) from the bottom wall of the installation groove (11) or cancel the scooping.

5. A small flow cyclone cutting device according to claim 3, characterized in that: It also includes a clamping block (16) and a spring three (17), wherein the clamping block (16) is radially slidably arranged on the large particle collecting body (2), and the two ends of the spring three (17) act on the clamping block (16) and the large particle collecting body (2) respectively, so as to provide a force for the clamping block (16) to slide radially outward, and an annular clamping groove (18) is provided on the inner side wall of the mounting groove (11), and after the clamping block (16) slides, it enters or leaves the annular clamping groove (18).

6. A small flow cyclone cutting device according to claim 5, characterized in that: It also comprises a sliding ring (19), which is axially slidably arranged on the large particle collecting body (2), and after the sliding ring (19) slides, is used to press the block (16) inwardly or cancel the pressing.

7. A small flow cyclone cutting device according to claim 1, characterized in that: The small particle collecting body (3) is threadedly connected to the large diameter end of the conical cutting chamber (5); the small particle collecting body (3) has a small particle channel (20) therein, the small particle channel (20) is communicated with the large diameter end of the conical cutting chamber (5); the large particle collecting body (2) has a dust collecting chamber (21) therein, the dust collecting chamber (21) is communicated with the small diameter end of the conical cutting chamber (5).

8. A small flow cyclone cutting device according to claim 7, characterized in that: The small particle collecting body (3) also has an air outlet channel (22), the air outlet channel (22) is in communication with the small particle channel (20), and the air outlet channel (22) is used to connect to a sampling tube.

9. A small flow cyclone cutting device according to claim 8, characterized in that: The inner wall of the air outlet channel (22) is provided with a second sealing ring (23).

10. A small flow cyclone cutting device according to claim 1, characterized in that: It also comprises a scraping portion (24), the scraping portion (24) being arranged on the outward end surface of the scraper (6), and the scraping portion (24) being one of a rubber strip, a sponge and a non-woven fabric.

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