Jet milling classifier

Abstract

The present invention discloses a jet pulverizing classifier, which relates to the technical field related to material classification. It includes a feeding unit, a crushing unit, and a jet classification unit arranged in sequence along the material conveying direction. The jet classification unit includes a jet pipe and a classifier. The classifier includes a classification chamber and three material classification channels communicating with the classification chamber. A classification knife is provided between any two adjacent classification channels. An adjusting mechanism for adjusting the deflection angle of the classification knife is also provided on the classification chamber, and a passive compensation mechanism is further included; the passive compensation mechanism includes that first compensation plates are arranged on both side surfaces of the blade of each classification knife, and each first compensation plate is slidably connected to the side wall of the corresponding classification channel; the first compensation plate changes its position based on the deflection force of the corresponding classification knife.

Description

Technical Field

[0001] The present invention relates to the technical field related to material classification, specifically a jet milling classifier. Background Art

[0002] As is well known, a high-precision jet classifier is a device for classifying particulate materials. Its working principle is mainly based on the different speeds of airflows and the physical properties of particles (such as density, shape, and particle size) to achieve classification. Its basic working principle is as follows:

[0003] Particle introduction: In a high-precision jet classifier, high-pressure gas is ejected from a nozzle at high speed to form a powerful jet, which guides the material particles into the classification chamber; the material is evenly fed into the classifier through a feeding device. When the particles come into contact with the high-speed airflow, the force exerted by the airflow on the particles will have different effects according to the size and density of the particles;

[0004] Particle classification: Smaller or lighter particles will be carried away by the airflow due to the buoyancy of the airflow and enter the airflow outlet or the upper collection device; larger or heavier particles, due to gravity and inertia, are not easily carried away by the airflow and will sink to the bottom of the classifier and enter the lower collection device; by adjusting the airflow speed, nozzle angle, and feeding amount, the classification effect can be changed, thereby improving the accuracy and efficiency of classification;

[0005] Collection and discharging: After classification, particles of different grades are collected through their respective outlets to achieve the purpose of classification.

[0006] For example, in the patent with the publication number CN213612645U, the publication date of July 06, 2021, and the name "A New Type of Jet Classifier for Polishing Powder", which includes a front cover and a fixing block. An observation window is provided inside the front cover. One side of the front cover is provided with a classifier inner cavity, and a rear cover is provided on one side of the classifier inner cavity. On the other side of the classifier inner cavity, a rubber pad is provided, and a connecting plate is installed on one side of the rubber pad. A jet pipe is installed on the inner wall of the connecting plate, and a connecting pipe is connected to the front end of the jet pipe. A blade is provided inside the connecting pipe. One side of the connecting pipe is connected to a feeding pipe, and an air inlet is provided at the front end of the feeding pipe. A feeding port is provided on one side of the feeding pipe. Through the bolt connection of the classifier inner cavity, when the equipment needs maintenance or repair, only need to unscrew the screws and remove the front cover to maintain the parts inside the classifier inner cavity, and the operation status of the equipment can be observed through the observation window during the operation of the equipment, which is very convenient.

[0007] The deficiencies of the prior art are as follows. For the adjustment of the classification granularity, by rotating the worm to engage with the gear, the first classification knife or the second classification knife is driven to move, so as to adjust the classification granularity and facilitate the screening of materials. However, after the position of the classification knife is adjusted, the depression between the channel through which the material flows and the side surface of the blade of the classification knife cannot maintain a smooth surface, resulting in the flow of the material being disturbed at the depression to form a vortex. Since the particle size of the material is very small, after the vortex is formed, it will seriously affect the flow of the classified material into the collection mechanism. Summary of the Invention

[0008] The object of the present invention is to provide a jet pulverization classifier to solve the technical problems in the related art.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] The jet pulverization classifier includes a blanking unit, a crushing unit, and a jet classification unit arranged in sequence along the material conveying direction. The jet classification unit includes a jet pipe and a classifier. The classifier includes a classification chamber and three material classification channels communicating with the classification chamber. A classification knife is provided between any two adjacent classification channels. An adjustment mechanism for adjusting the deflection angle of the classification knife is further provided on the classification chamber, and a passive compensation mechanism is also included. The passive compensation mechanism includes first compensation plates arranged on both side surfaces of the blade of each classification knife. Each first compensation plate is slidably connected to the side wall of the corresponding classification channel. The first compensation plate changes its position based on the deflection force of the corresponding classification knife.

[0011] In the above, the classification knife includes a semicircular section and a triangular section. A deflection shaft rod is arranged at the center of the semicircle of the semicircular section and is rotatably connected to the classification chamber. The width dimension of the end of the triangular section far from the blade is greater than the radial dimension of the semicircular section.

[0012] In the above, the first compensation plate includes a main section and a secondary section. The main section is slidably arranged on the side wall of the classification channel, and the main section has elasticity and has a tendency to drive the secondary section to lean against the side wall of the classification channel together based on its own elastic force.

[0013] In the above, the end of the main section far from the secondary section is arc-shaped, and the inner arc surface faces the corresponding classification channel.

[0014] In the above, a circular arc-shaped connecting block is provided at the end of the secondary section far from the main section. The connecting block is slidably connected to the semicircular section. During the deflection stroke of the classification knife in the direction away from any first compensation plate, the secondary section of this first compensation plate is wound around the arc surface of the semicircular section.

[0015] For each of the above, an arc rod is provided at the end of each connecting block connected to the semi-circular section. The arc rod is arranged to slide along its own arc trajectory on the semi-circular section, and the center of the arc rod is at the junction of the auxiliary section and the triangular section; during the deflection stroke of the grading knife towards the direction close to any one of the first compensation plates, the auxiliary section of this first compensation plate deflects relative to the semi-circular section along the center of the arc rod.

[0016] For each of the above, the adjusting mechanism includes a worm gear fixedly connected to a deflection shaft rod provided on each semi-circular section and two worm shafts rotatably provided on the grading cavity. The two worm gears correspond to the two worm shafts one by one, and the corresponding worm gears and worm shafts are meshed with each other.

[0017] For each of the above, there is a gap between the teeth of the worm gear and the teeth of the meshed worm shaft, and the size of this gap is within the size range of the particle diameter of the material passing through the corresponding grading channel.

[0018] For each of the above, after adjusting the deflection angle of any grading knife, the worm shaft corresponding to this grading knife is fixed to the grading cavity by bolts.

[0019] For each of the above, the blade part of the triangular section includes a fixed part and a swinging part. The swinging part is arranged to swing on the fixed part, and an elastic part is provided at the swinging place of the two.

[0020] The beneficial effect of the present invention is that by arranging first compensation plates on both side surfaces of the blade of each grading knife, after the grading knife deflects a certain angle, the depression that appears between the side surface of the blade of the grading knife and the side wall of the grading channel can be compensated, so as to ensure that the material can flow smoothly between the side surface of the blade of the grading knife and the side wall of the grading channel, so as to avoid the problem of eddy current. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0022] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the jet pulverization and classification machine provided in the embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the jet classification unit of the jet pulverization and classification machine provided in the embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the first perspective explosion structure of the jet classification unit of the jet pulverization and classification machine provided in the embodiment of the present invention;

[0025] Figure 4It is a schematic explosion structure diagram of the second perspective of the jet classification unit of the jet pulverizing classifier provided in the embodiment of the present invention;

[0026] Figure 5 It is a schematic cross-sectional structure diagram of the jet classification unit of the jet pulverizing classifier provided in the embodiment of the present invention;

[0027] Figure 6 is Figure 5 the enlarged structure diagram at position A in

[0028] Figure 7 It is a schematic three-dimensional structure diagram of the lock adjustment mechanism of the jet pulverizing classifier provided in the embodiment of the present invention.

[0029] Explanation of reference numerals:

[0030] 1. Feeding unit; 2. Crushing unit; 3. Jet classification unit; 30. Jet pipe; 31. Classification chamber; 32. Classification channel; 33. Classification knife; 330. Semicircular section; 331. Triangular section; 332. Oscillating part; 34. First compensation plate; 340. Main section; 341. Sub-section; 35. Connecting block; 36. Arc rod; 37. Second compensation plate; 38. Extension section; 39. Connecting rod; 4. Adjustment mechanism; 40. Worm gear; 41. Worm; 42. Bolt; 5. Collection mechanism. Detailed implementation manners

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the following will be combined with the attached Figure 1 to Figure 7 make a further detailed introduction to the present invention.

[0032] The embodiment of the present invention provides a jet pulverizing classifier, which includes a feeding unit 1, a crushing unit 2, and a jet classification unit 3 arranged in sequence along the material conveying direction. The jet classification unit 3 includes a jet pipe 30 and a classifier. The classifier includes a classification chamber 31 and three material classification channels 32 communicating with the classification chamber 31. A classification knife 33 is provided between any two adjacent classification channels 32. An adjustment mechanism 4 for adjusting the deflection angle of the classification knife 33 is further provided on the classification chamber 31, and a passive compensation mechanism is also included; the passive compensation mechanism includes a first compensation plate 34 arranged on both side surfaces of the blade of each classification knife 33, and each first compensation plate 34 is slidably connected to the side wall of the corresponding classification channel 32; the first compensation plate 34 changes its position based on the deflection force of the corresponding classification knife 33.

[0033] Specifically, when classifying some powdery granular materials according to different particle size ranges, a high-precision jet classifier will be used. That is, the materials that are already in the form of powdery particles will first be transported to the feeding unit 1, and the feeding unit 1 will push the materials into the jet classification unit 3 at a certain speed. However, during this process, the materials need to be crushed again to prevent agglomerated materials or materials with particle sizes exceeding the maximum particle size range after classification from entering the jet classification unit 3. Therefore, a crushing unit 2 will be added between the feeding unit 1 and the jet classification unit 3 to solve the above problems. Among them, the jet classification unit 3 includes a jet pipe 30 connected to an external air pump. There is a through port for the materials to enter on the jet pipe 30, and a classifier is arranged at the other end of the jet pipe 30. That is, when the materials enter the jet pipe 30 from the through port and come into contact with the high-speed air flow, the force exerted by the air flow on the material particles will have different effects according to the size and density of the particles. Smaller or lighter particles will be carried away by the air flow due to the buoyancy of the air flow and enter the air flow outlet or the upper collection device; larger or heavier particles, due to gravity and inertia, are not easily carried away by the air flow and will sink to the bottom of the classifier and enter the lower collection device. That is, there is also a classification channel 32 for different particle size materials to flow out on the classification chamber 31. Generally, the classification channels 32 for materials are divided into three types, which are used to transport coarse materials, medium materials, and fine materials in sequence. For example, the particle size of the coarse materials is greater than 10, the particle size of the medium materials is between 5 and 10, and the particle size of the fine materials is less than 5. Among them, the angle between the classification channel 32 corresponding to the coarse materials and the jet pipe 30 is the largest, the angle between the classification channel 32 corresponding to the medium materials and the jet pipe 30 is the second largest, and the angle between the classification channel 32 corresponding to the fine materials and the jet pipe 30 is the smallest. In this way, the classification of materials with different particle sizes can be carried out by using the buoyancy effect of the air flow. Among them, in order to change the particle size range of the materials transported by the classification channel 32, a classification knife 33 can be set between two adjacent classification channels 32, and then an adjustment mechanism 4 is set. According to actual needs, the deflection angle of the classification knife 33 can be adjusted through the adjustment mechanism 4, so as to control the opening size of the classification channel 32. The adjustment mechanism 4 for adjusting the deflection angle of the classification knife 33 can realize driving the classification knife 33 to deflect and restricting the position of the classification knife 33 after deflection. This is the prior art and will not be elaborated too much. When the materials are classified in the classification chamber 31 and flow out from different classification channels 32, they will be collected by different collection mechanisms 5.

[0034] In the prior art, when the position of the grading knife 33 is adjusted, any part of its deflection path cannot be obstructed, otherwise the adjustment of the grading knife 33 will be restricted. In this way, on the deflection path, the end away from the blade cannot contact any part of the grading channel, and a depression will appear between the side wall of the grading channel 32 and the side of the blade of the grading knife 33. For example, if a depression appears on a smooth transition surface, there is a large and obvious height difference between the depressed surface and the smooth surface, and the material cannot flow smoothly through the surface, causing the flow of the material in the depression to be disturbed to form an eddy current. Since the particle size of the material particles is very small, at the micron level, the formation of the eddy current will seriously affect the flow of the material into the collection mechanism 5 after classification.

[0035] Based on the above problems, in this embodiment, first compensation plates 34 are arranged on both sides of the grading knife 33, that is, when the grading knife 33 is driven to deflect, a recessed portion will appear between its end away from the blade and the side wall of the grading channel 32 on one side, and the deflection of the grading knife 33 can drive the first compensation plate 34 to move to compensate for the recessed portion, so as to reduce the area of the recessed portion as much as possible, thereby reducing the volume of the eddy current and reducing the impact on material transportation. The first compensation plate 34 is slidingly arranged on the corresponding side wall of the grading channel 32, and a spring can be provided between the first compensation plate 34 and the grading channel 32 in the sliding direction, that is, when the grading knife 33 approaches any first compensation plate 34 on both sides of its blade, the first compensation plate 34 on the other side will compensate for the recessed portion between the grading knife 33 and the side wall of the grading channel 32 under the action of the elastic force of the spring, and the first compensation plate 34 on one side will be squeezed by the grading knife 33 and move in the direction of the compression spring.

[0036] The beneficial effect of this embodiment is that by arranging the first compensation plates 34 on both sides of the blade of each grading knife 33, the depression between the blade side of the grading knife 33 and the side wall of the grading channel 32 can be compensated after the grading knife 33 is deflected by a certain angle, so as to ensure that the material can flow smoothly between the blade side of the grading knife 33 and the side wall of the grading channel 32, thereby avoiding the problem of eddy current.

[0037] Furthermore, the grading knife 33 includes a semicircular segment 330 and a triangular segment 331. A deflection shaft is provided at the center of the semicircular segment 330 and is rotatably connected to the grading cavity 31. The width of the end of the triangular segment 331 away from the blade is greater than the radial dimension of the semicircular segment 330.

[0038] Specifically, when the grading knife 33 deflects, a depression will be formed between one side and the side wall of a grading channel 32, and a protrusion will be formed on the side wall of the other grading channel 32 on the other side. The protrusion will also impede the flowing material. Therefore, in this embodiment, the grading knife 33 is divided into a semi-circular section 330 and a triangular section 331. That is, the semi-circular section 330 is the part of the grading knife 33 with a semi-circular cross-sectional structure after being cut radially from the starting deflection axis, and the triangular section 331 is the part with a triangular cross-sectional structure. The semi-circular section 330 is opposite to the edge position. Among them, the radial dimension of the semi-circular section 330 is smaller than the width dimension of the end where the triangular section 331 is connected to the semi-circular section 330. In this way, after the grading knife 33 deflects, the semi-circular section 330 will not form a protrusion on the side wall of the grading channel 32, and the arc surface of the semi-circular section 330 does not contact any part of the grading cavity 31 to prevent hindering the rotation of the semi-circular section 330.

[0039] Preferably, the first compensation plate 34 includes a main section 340 and a sub-section 341. The main section 340 is slidably arranged on the side wall of the grading channel 32, and the main section 340 has elasticity. Based on its own elastic force, there is a tendency to drive the sub-section 341 to lean against the side wall of the grading channel 32 together.

[0040] Specifically, since it is necessary to always keep the side wall of the grading channel 32 smooth, after the first compensation plate 34 is used for a long time, it will be deformed. For example, it no longer basically completely leans against the side wall of the grading channel 32 and has a tendency to shift towards the center of the grading channel 32. Then it will affect the size of the material conveyed by the grading channel 32. Moreover, according to the foregoing embodiment, it is also necessary for the first compensation plate 34 to be in contact with the grading knife 33, and the deformed first compensation plate 34 is difficult to be in contact with the grading knife 33. Therefore, in this embodiment, the first compensation plate 34 is set to be composed of an elastic main section 340 and an elastic sub-section 341. The main section 340 is thicker than the sub-section 341. That is, based on the elastic force of the main section 340, the main section 340 and the sub-section 341 can always have a tendency to lean against the side wall of the grading channel 32, thereby prolonging the service life of the first compensation plate 34. And in an optional embodiment, the end of the main section 340 away from the sub-section 341 can be set to be arc-shaped, and the inner arc surface faces the grading channel 32 at the corresponding position. In this way, the arc section can further give the rest of the main section 340 a force towards leaning against the side wall of the grading channel 32.

[0041] Although the above-mentioned embodiment solves the problem of the bulge caused by the deflection of the grading knife 33, if the deflection angle of the grading knife 33 is large, such as when a certain grading channel 32 needs to be closed, the auxiliary section 341 of the first compensation plate 34 and the semicircular section 330 can always be in sliding contact, but a depression will appear between the auxiliary section 341 of the first compensation plate 34 and the end of the triangular section 331 away from the blade. Therefore, in order to solve this problem, in a further embodiment, the end of the auxiliary section 341 away from the main section 340 is provided with an arc-shaped connecting block 35, and the connecting block 35 is slidably connected to the semicircular section 330; in the deflection stroke of the grading knife 33 in the direction away from any first compensation plate 34, the auxiliary section 341 of the first compensation plate 34 rolls on the arc surface of the semicircular section 330.

[0042] Specifically, the arc-shaped connecting block 35 is slidably connected on the semicircular segment 330, and the sliding trajectory is consistent with the arc-shaped trajectory of the arc-shaped connecting block 35, and the connecting block 35 is at the junction of the semicircular segment 330 and the triangular segment 331. The side of the connecting block 35 facing the auxiliary segment 341 is also arc-shaped, and the center of the circle is on the same central axis as the center of the semicircular segment 330. In this way, when the grading knife 33 swings in the direction away from any first compensation plate 34, the connecting block 35 corresponding to the first compensation plate 34 will be driven by the semicircular segment 330 to deflect, and the two There will be no relative rotation between the two, and the auxiliary segment 341 can undergo elastic deformation after being subjected to external force. Then, the deflection of the semicircular segment 330 will have a tendency to drive the auxiliary segment 341 to roll up and stick to the arc surface of the semicircular segment 330, and the radial dimension of the semicircular segment 330 can be further shortened. When the auxiliary segment 341 rolls up and sticks to the arc surface of the semicircular segment 330, the superimposed thickness of the two can ensure that no bulge will appear while also preventing depression. That is, the auxiliary segment 341 and the triangular segment 331 always maintain contact, and it is difficult for depression to appear.

[0043] When the grading knife 33 deflects toward any first compensation plate 34, although it can produce a pushing effect on the auxiliary segment 341, relative rotation will occur between the connecting block 35 and the semicircular segment 330, so that a depression will also appear between the auxiliary segment 341 and the triangular segment 331. Therefore, in order to avoid the occurrence of this depression as much as possible, in a further embodiment, an arc rod 36 is provided at the end where each connecting block 35 is connected to the semicircular segment 330, and the arc rod 36 is slidably arranged along its own arc trajectory on the semicircular segment 330, and the center of the arc rod 36 is at the intersection of the auxiliary segment 341 and the triangular segment 331; in the deflection stroke of the grading knife 33 toward any first compensation plate 34, the auxiliary segment 341 of the first compensation plate 34 is deflected relative to the semicircular segment 330 along the center of the arc rod 36.

[0044] Specifically, the center of the arc-shaped rod 36 is at the junction of the corresponding secondary section 341 and the triangular section 331. During the deflection of the grading knife 33 towards any one of the first compensation plates 34, relative rotation occurs between the semi-circular section 330 and the connecting block 35 corresponding to the first compensation plate 34. The center of rotation is at the position where the center of the arc-shaped rod 36 is located. Moreover, the closer the center is to the position closer to the center of the grading channel 32 at the junction of the secondary section 341 and the triangular section 331, the smaller the depression between the secondary section 341 and the triangular section 331 will be, thus better solving the eddy current problem.

[0045] Preferably, the adjusting mechanism 4 includes worm gears 40 fixedly connected to the deflection shaft rods provided on each semi-circular section 330 and two worm shafts 41 rotatably provided on the grading cavity 31. The two worm gears 40 correspond to the two worm shafts 41 one by one, and the corresponding worm gears 40 and worm shafts 41 are meshed with each other. Specifically, by rotating the worm shaft 41, the corresponding meshed worm gear 40 is driven to rotate, thereby realizing the adjustment of the deflection angle of the grading knife 33. The worm gear 40 and worm shaft 41 mechanism has self-locking property when the lead angle of the worm shaft 41 is less than the equivalent friction angle between the meshing teeth, that is, only the worm shaft 41 can be used as the driving part to drive the worm gear 40 to rotate, and the worm gear 40 cannot drive the worm shaft 41 to move. In this way, after driving the grading knife 33 to deflect, the position of the grading knife 33 can be locked.

[0046] Furthermore, there is a gap between the teeth of the worm gear 40 and the teeth of the meshed worm shaft 41, and the size of this gap is within the range of the particle size of the material passing through the corresponding grading channel 32.

[0047] Specifically, since there is a moving range for the particle size of the material allowed to pass through each grading channel 32, when the maximum allowable particle size of the material is reached, if there is material stuck at the junction of the grading channel 32 and the grading cavity 31, it will hinder the subsequent material flow. Therefore, it is necessary to solve this problem of material blockage. In this embodiment, a gap is provided between the teeth of the worm gear 40 and the teeth of the corresponding meshed worm shaft 41. That is, on the basis of not affecting power transmission, when the grading knife 33 is impacted by the airflow, it can swing, and the swing range is within the range of the allowable particle size. For example, for the grading channel 32 corresponding to medium-sized materials, the allowable particle size of the material passing through is between 5 and 10. Then the swing range of the two grading knives 33 corresponding to this grading channel 32 can be between 4 and 6 and between 9 and 10. Because there is a situation where fine materials may enter any grading channel 32, it is sufficient that coarse materials do not enter the medium-sized material grading channel 32 and medium-sized materials do not enter the fine material grading channel 32. When the grading knife 33 swings under the impact of the airflow, if there is a problem of material jamming, it can also be solved to a certain extent.

[0048] In a further embodiment, the blade portion of the triangular segment 331 includes a fixed portion and a swinging portion 332. The swinging portion 332 is swingably arranged on the fixed portion, and an elastic member is provided at the swinging position between the two. That is, large particulate materials are basically stuck at the blade of the classification knife 33. Then, by utilizing the swinging effect of the classification knife 33 impacted by the air flow, when the swinging portion 332 follows the triangular segment 331 to swing and is blocked by the materials, it will swing on the fixed portion. Then, the opening size of the classification channel 32 at the blade of the classification knife 33 will become larger, and the large particulate materials will fall off, thus better solving the problem of material jamming.

[0049] Since there are first compensation plates 34 on both side walls of the classification channel 32 corresponding to the medium materials, when the two first compensation plates 34 are driven by the corresponding classification knives 33, there will be no significant difference in their surfaces. For the side walls of the classification channel 32 corresponding to the coarse materials and the side walls of the classification channel 32 corresponding to the fine materials, there is only a first compensation plate 34 on the side wall close to the classification knife 33, and no first compensation plate 34 is provided on the other side. Then, after the first compensation plate 34 is driven to move, there will be an obvious difference in the surfaces of the two side walls. When the materials in contact with the side walls flow, there is a problem of being guided, which affects the material flow. Therefore, in this embodiment, a second compensation plate 37 is slidably arranged on the side wall of the classification channel 32 corresponding to the coarse materials away from the classification knife 33, and a second compensation plate 37 is also slidably arranged on the side wall of the classification channel 32 corresponding to the fine materials away from the classification knife 33. Moreover, the first compensation plate 34 and the second compensation plate 37 in the classification channel 32 corresponding to the coarse materials are connected by a connecting rod 39, and the first compensation plate 34 and the second compensation plate 37 in the classification channel 32 corresponding to the fine materials are also connected by a connecting rod 39. The connecting rod 39 is slidably arranged on the outer wall of the classification cavity 31. In this way, the movement of the first compensation plate 34 can drive the second compensation plate 37 to move synchronously, so as to ensure that there is basically no obvious difference in the changes of the surfaces of the two side walls of the classification channel 32.

[0050] Furthermore, an extension section 38 is also provided on the second compensation plate 37. The extension section 38 is located on the two side walls of the classification cavity 31 corresponding to the end of the jet pipe 30. When the second compensation plate 37 moves, the extension section 38 can also move accordingly. In this way, the materials in contact with the extension section 38 will be rubbed. Coupled with the swinging portion 332, the problem of material jamming can be further solved. Moreover, the extension section 38 covers the surfaces of the two side walls of the classification cavity 31, so as to reduce the wear of the two side walls of the classification cavity 31. Compared with the repair of the classification cavity 31, the cost of replacing the extension section 38 is lower.

[0051] Preferably, after adjusting the deflection angle of any grading knife 33, the corresponding worm 41 of the grading knife 33 is fixed on the grading chamber 31 by bolts 42; preferably, since the machine vibrates during jet classification, and in the foregoing embodiment, there is a gap between the teeth of the worm gear 40 and the corresponding teeth of the meshing worm 41, then the self-locking between the two may become loose. Therefore, in this embodiment, on the premise of not affecting the swing of the grading knife 33 under the impact of air flow, the worm 41 is locked on the outer shell of the grading chamber 31 by bolts 42.

[0052] Only some exemplary embodiments of the present invention have been described by way of illustration above. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. Jet pulverizing classifier, comprising a blanking unit, a crushing unit and a jet classification unit arranged in sequence along the material conveying direction, wherein the jet classification unit comprises a jet pipe and a classifier, the classifier comprises a classification chamber and three material classification channels communicating with the classification chamber, a classification knife is arranged between any two adjacent classification channels, and an adjusting mechanism for adjusting the deflection angle of the classification knife is further arranged on the classification chamber, characterized in that, It also includes a passive compensation mechanism; The passive compensation mechanism includes that first compensation plates are arranged on both side surfaces of the blade of each grading knife, and each first compensation plate is slidably connected to the side wall of the corresponding grading channel; the first compensation plate changes its position based on the acting force of the deflection of the corresponding grading knife; The grading knife includes a semi-circular section and a triangular section. A deflection shaft rod is arranged at the center of the semi-circular section and is rotatably connected to the grading cavity. The width dimension of the end of the triangular section far from the blade is larger than the radial dimension of the semi-circular section; The first compensation plate includes a main section and a sub-section. The main section is slidably arranged on the side wall of the grading channel, and the main section has elasticity. Based on its own elastic force, there is a tendency to drive the sub-section to lean against the side wall of the grading channel together; One end of the main section far from the sub-section is arc-shaped, and the inner arc surface faces the grading channel at the corresponding position; A circular arc connecting block is arranged at the end of the sub-section far from the main section, and the connecting block is slidably connected to the semi-circular section; During the deflection stroke of the grading knife in the direction away from any first compensation plate, the sub-section of this first compensation plate is wound on the arc surface of the semi-circular section; An arc rod is arranged at each end of the connecting block connected to the semi-circular section, and the arc rod is slidably arranged on the semi-circular section along its own arc track. The center of the arc rod is at the junction of the sub-section and the triangular section; During the deflection stroke of the grading knife in the direction close to any first compensation plate, the sub-section of this first compensation plate deflects relative to the semi-circular section along the center of the arc rod; 2. The jet mill classifier according to claim 1, wherein The adjusting mechanism includes a worm gear fixedly connected to the deflection shaft rod arranged on each semi-circular section and two worm shafts rotatably arranged on the grading cavity. The two worm gears correspond to the two worm shafts one by one, and the corresponding worm gear and worm shaft are meshed with each other; 3. The jet mill classifier according to claim 2, characterized in that, There is a gap between the teeth of the worm gear and the teeth of the meshed worm shaft, and the size of this gap is within the size range of the particle diameter of the material passing through the corresponding grading channel; 4. The jet milling classifier according to claim 2, wherein, After adjusting the deflection angle of any grading knife, the worm shaft corresponding to this grading knife is fixed on the grading cavity by bolts; 5. The jet milling classifier according to claim 3, wherein, The blade part of the triangular section includes a fixed part and a swinging part. The swinging part is swingably arranged on the fixed part, and an elastic part is arranged at the swinging position of the two.

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