Pulse airflow cleaning dust cage cleaning device and separator

Abstract

The present invention discloses a cleaning device and a separator for cleaning dust cages with pulse airflow, wherein the cleaning device comprises: a main pipe, located outside the corresponding dust cage, parallel to the axis of the dust cage, and between the outer cotton peeling layer position of the dust cage and the material introduction position; a branch pipe, arranged axially of the main pipe, with the branch pipe opening facing the dust cage; and an air supply device, supplying compressed air to the main pipe. The cleaning device according to the present invention has a relatively simple structure and is relatively compact as a whole.

Description

Technical Field

[0001] The present invention relates to a cleaning device for cleaning the net surface of a dust cage by means of pulse airflow, and also relates to a separator equipped with the cleaning device. Background Art

[0002] Separator is a common process equipment used in the cotton processing industry. In the field of cotton processing, the application range of separator is very wide. Its basic function is to separate the gas and material of the conveying material, and at the same time, it can separate some impurities and heavy objects mixed in the cotton. It is mainly used for transportation between cotton processing equipment. Therefore, it can be used for the transportation of seed cotton and lint cotton. At the same time, it can separate some impurities and heavy objects in the seed cotton from the seed cotton, or separate short lint, sterile seeds, impurities and other substances in the lint cotton.

[0003] Since short lint, sterile seeds, impurities, etc. have the characteristics of small particles and short fibers, mesh steel plates with relatively small mesh diameters (mesh diameter not greater than 2mm) or steel wire meshes with higher mesh counts (40 meshes to 100 meshes) are used to make dust cage mesh surfaces. In dust cages with such dust cage mesh surfaces, since short lint, sterile seeds, and impurities contain finer particles, they are easily embedded in the mesh of the mesh steel plate or steel wire mesh. The air-closing valve rubber plate or brush that comes with the separator can only brush off the objects attached to the surface of the mesh steel plate or steel wire mesh, but are powerless against the fine particles embedded in the mesh. As more and more small particles are embedded, the ventilation area of ​​the mesh steel plate or steel wire mesh gradually decreases, and the transport air volume in the conveying pipeline also decreases, which can easily cause blockage of the process line and forced interruption of the processing process.

[0004] In view of this, for example, Chinese patent document CN213295594U discloses a refined cotton lint cleaning and impurity removal device that uses pulse airflow to clean the dust cage mesh surface. In this patent document, a blow pipe is provided in the dust suction drum (equivalent to the dust cage), and the blow pipe is connected to a high-pressure air bag located outside the dust suction drum and fixed on the frame through a pipeline, and a pulse valve is installed on the pipeline. The blow pipe is provided with a nozzle corresponding to the impurity suction hole on the dust suction drum mesh surface. When it is necessary to clean the impurity suction hole of the dust suction drum, the compressed air in the high-pressure air bag is sprayed out through the blow pipe and the nozzle, and the impurity suction hole is back-blown and cleaned. The nozzle is installed on the blow pipe in a roughly radially arranged manner. Since it is necessary to use backblowing to blow out the impurities embedded in the impurity suction hole, although it is possible to select a position to ensure that the impurities do not enter the space where the cotton layer is located, under this condition, a separate blowing space needs to be isolated to separate the impurities cleaned by the pulse airflow, and the structure is relatively complex.

[0005] At present, in the implementation of cleaning the dust cage mesh surface mainly by pulse airflow, the device for generating pulse airflow is generally installed inside the dust cage to clean the dust cage mesh surface in a recoil manner. The same technical problems also exist, namely, it occupies a large space and has a relatively complex structure. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a cleaning device for cleaning a dust cage with a pulse airflow which has a relatively simple structure and is relatively compact as a whole. The present invention also provides a separator equipped with the cleaning device.

[0007] According to a first aspect of an embodiment of the present invention, there is provided a cleaning device for cleaning a dust cage with a pulse airflow, comprising: The main pipe is located outside the corresponding dust cage, parallel to the axis of the dust cage, and between the outer peeling cotton layer position of the dust cage and the material introduction position; The branch pipe is arranged axially of the main pipe, and the branch pipe opening faces the dust cage; and The gas supply device supplies compressed gas to the main pipe.

[0008] Optionally, the branch pipes are arranged parallel to each other, and the angle α between the axis of the branch pipe and the dust cage mesh surface is 5° to 30°; The intersection of the branch pipe axis and the dust cage mesh surface is recorded as the reference intersection point, and the angle α is the angle between the branch pipe axis and the tangent line of the dust cage mesh surface passing through the reference intersection point.

[0009] Optionally, the distance between the branch pipe opening and the reference intersection point is 20 mm to 80 mm.

[0010] Optionally, an adjustment device is provided in the axial direction of the branch pipe for adjusting the distance between the branch pipe opening and the reference intersection point by driving the main pipe.

[0011] Optionally, the center distance between adjacent branch pipes is 150 mm to 250 mm.

[0012] Optionally, the inner tube diameter of the branch tube is 7.5-15 mm.

[0013] Optionally, the main pipe or the air supply device is equipped with a pulse valve to provide pulse jet.

[0014] Optionally, the pulse length of the pulse valve is 0.1-0.3 s, and the pulse interval is 15 s-300 s.

[0015] Optionally, the air supply pressure of the branch pipe is 0.4~0.6MPa.

[0016] According to a second aspect of an embodiment of the present invention, a separator is provided, comprising the cleaning device described in the first aspect of an embodiment of the present invention.

[0017] According to the cleaning device for cleaning the dust cage with pulse airflow in the embodiment of the present invention, the main pipe and branch pipe for cleaning the dust cage mesh surface are arranged on the periphery of the dust cage rather than inside. On the one hand, the difficulty of configuring the main pipe and branch pipe can be reduced, because the main pipe and branch pipe are located outside the dust cage and have relatively good maintainability; on the other hand, because they are located outside the rotatable dust cage, their structural configuration is relatively simple. At the same time, since the dust and other debris cleaned away by the pulse airflow will directly enter the dust cage and be sucked away by the induced draft system instead of being retained in the separator, compared with the known method of cleaning the dust cage mesh surface by recoil, a separate structure for discharging the recoiled debris is required. According to the cleaning device in the embodiment of the present invention, there is no need to set a structure for discharging the cleaned debris, thereby making the overall structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of a separator in one embodiment.

[0019] Figure 2 This is a schematic diagram of the left-side structural view of a separator in one embodiment.

[0020] Figure 3 for Figure 2 Enlarged view of part I.

[0021] Figure 4 This is a schematic diagram of the front view of the structure of the injection pipe assembly formed by the main pipe and the branch pipe in one embodiment.

[0022] Figure 5 It is a schematic diagram of the top view of the blowing pipe assembly.

[0023] In the figure: 1. Motor, 2. Transmission device, 3. Bracket, 4. Air closing valve device, 5. Dust cage shaft, 6. Dust cage, 7. Cotton inlet chamber, 8. Main pipe, 9. Branch pipe. DETAILED DESCRIPTION

[0024] In the cotton processing production line, the separator is a relatively commonly used auxiliary equipment. Its main function is to separate the seed cotton from the gas used to transport the seed cotton so that the seed cotton can enter the next processing step, and at the same time, it can separate some impurities from the seed cotton.

[0025] Figure 2 The basic principle of the separator can be clearly shown in the figure. At the same time, for the sake of overall understanding, the following briefly explains the location and configuration reasons of the separator in the cotton processing production line. The cotton processing production line first feeds the seed cotton into the cotton processing production line through the cotton feeding mechanism. In the subsequent station flow, the cotton is mainly transported by wind, generally by induced draft. If the process equipment at different stations all use induced draft to transport materials, mutual interference problems will inevitably occur. Under this condition, the separator was proposed.

[0026] In FIG. 2 , seed cotton or lint cotton enters the cotton inlet chamber 7, and the dust cage 6 rotating clockwise absorbs the seed cotton entering the cotton inlet chamber 7 onto the dust cage mesh surface of the dust cage 6 based on the induced wind, and a cotton layer is formed on the dust cage mesh surface based on the absorption, and the dust cage carries the cotton layer to Figure 2 At the air shut-off valve device 4 shown in the figure, the air shut-off valve device 4 has a rotor with multiple blades (rubber plates or brush strips) on it. During the rotation process, adjacent blades cooperate with the valve housing to form a cavity for accommodating, for example, seed cotton scraped off from the dust cage 6 by the blades, so as to transfer, for example, the seed cotton to the outlet side of the air shut-off valve device 4. During this process, the cooperation between the blades and the valve housing can form an airtight seal, thereby separating, for example, the seed cotton from the wind. In other words, during this process, the separator acts as an isolation component for conveying gas, but can ensure that, for example, the seed cotton is transferred to the next process equipment.

[0027] As described in the background technology section, during the separation process of the separator for separating materials and conveying gas, some impurities will pass through the dust cage mesh surface and enter the dust cage 6. As the conveying gas is discharged, due to the particle size of the impurities and the influence of cotton fibers, some impurities will accumulate in the mesh holes of the dust cage mesh surface and gradually block the mesh holes.

[0028] The main method of traditionally cleaning the mesh of the dust cage is to blow out the impurities in the mesh by backblowing, and a separate impurity channel needs to be provided for the backblown impurities to prevent the backblown impurities from being mixed into, for example, the seed cotton again.

[0029] In the embodiment of the present invention, the blow pipe assembly is arranged outside the dust cage 6 to prevent the impurities cleaned by the blow pipe assembly from re-entering the chamber of the separator and causing secondary contamination of, for example, seed cotton or lint. In this way, there is no need to set up an additional impurity discharge structure, thereby simplifying the overall structure and making the overall structure more compact.

[0030] Regarding the comparison between back-blowing and forward blowing, it should be known that for impurities such as dust, the cleaning effects of back-blowing and forward blowing are basically the same. It has been verified that under the same blowing pressure, flow rate, and blowing time conditions, the cleaning effects of back-blowing and forward blowing are basically the same. For harder debris such as gravel, the difference is basically the same, because gravel and other debris are generally embedded in the mesh in a mosaic manner. Under this condition, neither back-blowing nor forward blowing can clean them up, and manual cleaning is often required. In other words, although back-blowing is currently widely used to clean up debris on the dust cage mesh, the cleaning effect of forward blowing is not bad, and the structure required for forward blowing is more compact.

[0031] The configuration is basically the same as the back-blowing cleaning in terms of usage. Both use pulse airflow for cleaning. The principle of pulse airflow cleaning is mainly to use a short airflow to generate an impact force far greater than the conveying airflow, and blow away the debris accumulated in the mesh holes of the dust cage.

[0032] Correspondingly, the core of the cleaning device for cleaning the dust cage with pulse airflow based on the embodiment of the present invention is a blowing pipe assembly formed by a main pipe 8 and a branch pipe 9, wherein the main pipe 8 is arranged outside the dust cage 6 in the separator and is parallel to the axis of the dust cage 6.

[0033] from Figure 2 As can be seen from the structure shown in the example, Figure 2 In the state shown in the figure, the dust cage 6 rotates clockwise, and the lint, for example, that enters the separator is adsorbed on the dust cage 6 in the feed chamber and the upward chamber section until it is peeled off by the blades on the air closing valve device 4, exposing the dust cage mesh again, and further circulates to the area where the cotton feed chamber 7 is located, and then the next cycle of adsorption of lint, for example, is carried out. Under this condition, Figure 2 The lower part shown in the figure is the area between the cotton layer peeling position outside the dust cage 6 and the material introduction position. The dust cage mesh surface is exposed outside the cotton layer. The spray pipe assembly is installed in this area. This area is also an inherent area in the separator cavity. There is no need to open up a new area. The impurities cleaned by spraying will enter the interior of the dust cage 6 and be sucked away by the induced draft system, rather than re-entering the outer space of the dust cage 6 of the separator.

[0034] Furthermore, the injection pipe assembly further comprises a branch pipe 9, which is arranged axially of the main pipe 8, namely the air intake header, and the pulse airflow is injected outwardly through the branch pipe 9.

[0035] It is obvious that the pipe opening of the branch pipe 9 faces the dust cage 6 .

[0036] Correspondingly, the same configuration as the conventional backflush method is that an air supply device is required to supply compressed gas to the main pipe 8. Since the air supply device is a conventional configuration, it will not be described in detail here.

[0037] In conventional back-blowing, the pipe body used to generate direct blowing is generally arranged inside the dust cage 6 in the form of a radial pipe. However, in the embodiment of the present invention, taking various factors into consideration, the branch pipe 9 is arranged in the form of a non-radial pipe.

[0038] First, the branch pipes 9 are arranged parallel to each other, that is, they are arranged in parallel in a group, and the blowing direction is the same. Relative to the radial line of the branch pipe 9, the blowing direction of the branch pipe 9 is inclined, which is manifested in that the angle α between the axis of the branch pipe 9 and the dust cage mesh surface is 5° to 30°, and the angle α is preferably 12°.

[0039] For a more precise description, see Figure 3, the intersection of the branch pipe axis and the dust cage mesh surface is recorded as the reference intersection point, and the angle α is the angle between the branch pipe axis and the tangent of the dust cage mesh surface passing through the reference intersection point.

[0040] After research, it was found that when the blowing pipe assembly is set outside the dust cage 6, straight blowing, that is, when the angle α is 90°, the corresponding branch pipe 9 is a radial pipe based on the dust cage 6. This structure has a relatively good cleaning effect, but it is easy to directly blow most of the impurities into the dust cage at one time in a short period of time and be sucked away by the induced draft fan. Since a large amount of impurities are formed in a short period of time, the dust removal capacity of the dust removal part of the induced draft fan system may be exceeded. At the same time, if the induced draft fan is used to directly induce air without passing through the dust removal part, some impurities may adhere to the blades of the fan, causing the fan to shake and accelerate the wear of the fan blades.

[0041] It should be noted that pulse airflow cleaning often uses the instantaneous impact of a short airflow, and the wind pressure of the impact airflow is relatively high. Although the direct blowing time is relatively short, it is also easy to interfere with the adsorption of, for example, lint on the opposite surface. If the pulse length of the pulse airflow is relatively long, but the wind pressure is relatively small, the angle α can still be selected to be relatively large. The aforementioned selection of the angle α "5°~30°" is a selection under the conditions of a relatively short pulse length and a relatively large wind pressure. In particular, if the pulse length is relatively long and the wind pressure is relatively small, it is difficult to clean up the debris attached to the dust cage 6. The compressed gas source used in the embodiment of the present invention supplies a compressed gas with a pressure of 0.4~0.6MPa, and the pulse length of the adapted pulse valve is 0.1~0.3s. A short airflow is used to impact the dust cage mesh surface, and some debris attached to the dust cage mesh surface is directly blown into the dust cage 6.

[0042] In addition, regarding the pulse interval, the pulse interval is 15s~300s, and can be adjusted according to, for example, the impurity content of seed cotton or lint cotton.

[0043] The angle α should not be too small, otherwise even a short pulse airflow cannot knock out the debris. If the wind pressure is further increased, the debris may be knocked to the side where the wind shielding valve device 4 is located, and some impurities may be knocked into the lint, for example, that is drawn into the air closing valve device 4. Therefore, the angle α should not be less than 5°.

[0044] Regarding the distance between the branch pipe opening and the reference intersection, it is necessary to consider that the number of branch pipes 9 should not be too many, otherwise it will affect the distribution of compressed gas. It should be known that the distribution of airflow conforms to the principle of proximity, that is, under the condition that the diameter of branch pipes 9 is the same, the branch pipes 9 closer to the air inlet of the main pipe 8 will distribute more airflow. Regarding the number of branch pipes, it is positively correlated with the length of the main pipe 8. Considering that the length of the main pipe 8 may be uncertain, the center distance of adjacent branch pipes 9 is used as a reference, and the center distance l of adjacent branch pipes 9 is 150mm~250mm. Under the condition that there is a certain center distance between adjacent branch pipes 9, it is necessary for the opening of the branch pipe 9 to have a certain distance from the dust cage mesh surface to ensure that the given airflow has a certain degree of dispersion, which is conducive to improving the coverage of the mesh by the impact of the branch pipe 9. Based on these considerations, the distance between the branch pipe opening and the reference intersection is 20mm~80mm.

[0045] In addition, the inner tube diameter of the main tube 8 is D, and the inner tube diameter of the branch tube 9 is d, thereby determining that the inner tube cross-sectional area of ​​the main tube 8 is S, and the inner tube cross-sectional area of ​​the branch tube 9 is A. Assuming that the number of branch tubes 9 is n, S=nA.

[0046] The total length T of the main pipe 8 can be 1200~2000mm. If the separator has a large machine radius, two main pipes 8 can be provided. One end of the main pipe 8 is sealed and the other end is an inlet. When two main pipes 8 are used, one of the main pipes 8 is connected from one side wall panel of the separator and the other is connected from the other side wall panel. This can reduce the influence of the proximity principle. The total length of the two main pipes 8 is roughly equivalent to the machine radius of the separator.

[0047] As mentioned above, the cleaning effect is affected by comprehensive factors and is affected by the time, region, weather and other factors of seed cotton harvest. The initial impurity content of seed cotton is not consistent. In order to improve adaptability, an adjustment device is provided in the axial direction of the branch pipe 9 for adjusting the distance between the branch pipe mouth and the reference intersection by driving the main pipe 8. The adjustment device is obviously a linear adjustment device, which can be a linear motion mechanism, such as a nut screw mechanism. The nut screw mechanism can be adjusted manually and is also suitable for power machine drive. It is a mechanism with relatively high adjustment accuracy. The power machine drive or manual drive of the nut screw mechanism is common knowledge in the mechanical field and will not be repeated here.

Claims

1. A cleaning device for cleaning dust cages with pulse airflow, characterized in that: include: The main pipe is located outside the corresponding dust cage, parallel to the axis of the dust cage, and between the outer peeling cotton layer position of the dust cage and the material introduction position; The branch pipe is arranged axially of the main pipe, and the branch pipe opening faces the dust cage; and The gas supply device supplies compressed gas to the main pipe.

2. The cleaning device according to claim 1, characterized in that: The branch pipes are arranged parallel to each other, and the angle α between the branch pipe axis and the dust cage mesh surface is 5°~30°; The intersection of the branch pipe axis and the dust cage mesh surface is recorded as the reference intersection point, and the angle α is the angle between the branch pipe axis and the tangent line of the dust cage mesh surface passing through the reference intersection point.

3. The cleaning device according to claim 2, characterized in that: The distance between the branch pipe outlet and the reference intersection is 20mm~80mm.

4. The cleaning device according to claim 3, characterized in that: In the axial direction of the branch pipe, an adjustment device is provided for adjusting the distance between the branch pipe opening and the reference intersection point by driving the main pipe.

5. The cleaning device according to claim 1, characterized in that: The center distance between adjacent branches is 150mm~250mm.

6. The cleaning device according to claim 1, characterized in that: The inner diameter of the branch pipe is 7.5~15mm.

7. The cleaning device according to claim 1 or 6, characterized in that: The main pipe or the air supply device is equipped with a pulse valve to provide pulse jet.

8. The cleaning device according to claim 7, characterized in that: The pulse length of the pulse valve is 0.1-0.3s, and the pulse interval is 15s-300s.

9. The cleaning device according to claim 1, characterized in that: The air supply pressure of the branch pipe is 0.4~0.6MPa.

10. A separator, characterized in that: It comprises the cleaning device described in any one of claims 1 to 9.

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