Pneumatic conveying online pipeline filter

Abstract

A pneumatic conveying online pipeline filter comprises a filter body, a feeding three-way elbow, a filter element and an intelligent impurity cleaning and blowing unit, a hollow inner cavity is formed in the filter body, the filter element is arranged in the inner cavity of the filter body, the upper end of the filter body is connected with the intelligent impurity cleaning and blowing unit, and the lower end of the filter body is connected with the feeding three-way elbow. Through linkage of the differential pressure detection unit and the intelligent cleaning and blowing system, real-time monitoring and automatic cleaning of the blockage state are achieved, the blockage cleaning efficiency is improved, and the conveying process does not need to be interrupted. The filter element adopts the combination of the conical filter screen and the umbrella-rib-shaped support frame, so that the filter area is increased, the compression resistance is enhanced and the resistance is reduced through a flange sealing structure of the fixed block and the annular pressing plate, the airflow impact force is dispersed by the support frame, and the service life of the filter element is prolonged. The design of the horizontal inlet / outlet and the vertical filtering channel of the three-way elbow is adaptive to various pipeline arrangement forms, so that the system overpressure risk during unblocking is avoided, and the production safety is ensured.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic conveying technology, and in particular to an online pipeline filter for pneumatic conveying. Background Technology

[0002] In the metallurgical industry, the pulverized coal transported by blast furnace injection systems must have strict particle size distribution and purity requirements. When lightweight impurities such as waste paper and plastics are mixed in, they can form "soft blockages" at pipe bends, causing a sudden drop in local wind speed and gradual accumulation of pulverized coal. Conversely, the inclusion of large particles can directly cause blockages at abrupt changes in pipe diameter, leading to interruptions in pipeline transport. In the power industry, during the transport of desulfurization limestone powder in circulating fluidized bed boilers, if the material clumps due to excessive moisture, it will not only clog the pipes but also affect desulfurization efficiency and increase equipment wear. In the chemical industry, the contamination of some high-value-added powdered materials during transport can severely degrade product quality. Once the pipeline is blocked, the entire production line must be forced to shut down, resulting in significant economic losses.

[0003] The harm caused by these blockages goes far beyond this. Frequent blockages significantly reduce the operational stability of pneumatic conveying systems, drastically shortening the effective operating time of the equipment. To resolve blockages, on-site workers must frequently perform high-intensity tasks such as disassembly and unblocking, which is not only physically demanding but also poses certain safety risks, such as burns from hot materials and the risk of dust explosions. Furthermore, restarting the conveying system after a blockage consumes a large amount of energy, further increasing production costs.

[0004] Therefore, the existing technology has problems and needs further improvement and development. Summary of the Invention

[0005] Purpose of the utility model: In order to solve the problems existing in the prior art, the purpose of this utility model is to provide an online pipeline filter for pneumatic conveying, which solves the problems of filtering, cleaning and screening of debris and large particles in the pneumatic conveying process of various complex materials.

[0006] Technical Solution: To solve the above technical problems, this technical solution provides an online pneumatic conveying pipeline filter, including a filter body, a feed tee elbow, a filter element, an intelligent debris cleaning unit, and a differential pressure detection unit. The filter body has a hollow inner cavity, and the filter element is disposed in the inner cavity of the filter body. The upper end of the filter body is connected to the intelligent debris cleaning unit, and the lower end of the filter body is connected to the feed tee elbow.

[0007] The filter element includes a filter screen; the filter screen is a hollow conical funnel shape, the axis of the filter screen coincides with the axis of the filter body, and the surface of the filter screen is a perforated mesh; a support frame is disposed in the hollow inner cavity of the filter screen;

[0008] The intelligent debris cleaning unit includes a blow pipe and a cleaning pipe; the cleaning pipe is a hollow conical funnel shape, the lower end of the cleaning pipe is connected to the filter body, and the upper end of the cleaning pipe is connected to the discharge pipe; the blow pipe is inclinedly arranged on the outer wall of the cleaning pipe.

[0009] Furthermore, the feed tee elbow is a hollow tee elbow, including a horizontally arranged material inlet channel, a horizontally arranged debris outlet channel, and a vertically upward-extending filter channel. The material inlet channel is connected to the feed pipe, and the upper end of the filter channel is connected to the filter body, and the filter channel communicates with the inner cavity of the filter body.

[0010] Furthermore, the filter element also includes an annular pressure plate and a fixing block; the upper edge of the filter screen is connected to the inner diameter of the annular pressure plate, and the annular pressure plate is disposed between the filter body and the intelligent debris blowing unit.

[0011] The lower end of the filter screen is fixedly connected to the fixing block, and the axis of the fixing block coincides with the axis of the filter screen;

[0012] The support frame includes a horizontal part and a vertical part; the first horizontal part is set on a horizontal surface flush with the annular pressure plate, the second horizontal part is set between the upper and lower ends of the filter screen, the two ends of the straight rod of the first vertical part are respectively fixedly connected to the four extension ends of the horizontal part, the upper end of the straight rod of the second vertical part is connected to the center point of the second horizontal part, and the lower end of the straight rod of the second vertical part is connected to the center point of the upper surface of the fixing block.

[0013] Furthermore, the inner diameter of the annular pressure plate is equal to the inner diameter of the flange that fixes the filter body and the intelligent debris cleaning unit, and the outer diameter of the annular pressure plate is smaller than the outer diameter of the flange that fixes the filter body and the intelligent debris cleaning unit.

[0014] Furthermore, the fixing block includes a cylindrical portion and a conical portion. The cylindrical portion is disposed at the upper end of the fixing block and is fixedly connected to the lower end of the filter screen. The conical portion is disposed at the lower end of the fixing block and is in an inverted state. The circular bottom surface of the conical portion is connected to the lower end of the cylindrical portion, and the bottom surface of the cylindrical portion is equal to the circular bottom surface of the conical portion.

[0015] Furthermore, the first horizontal part of the support frame is a horizontally placed cross-shaped structure with a width equal to the thickness of the annular pressure plate, and the ends of the four extended ends of the cross-shaped structure are fixedly connected to the inner surface of the inner diameter of the annular pressure plate.

[0016] The second horizontal part of the support frame is a horizontally placed cross-shaped structure, and the ends of the four extended ends of the cross-shaped structure are fixedly connected to the inner surface of the filter screen; the cross-shaped structures of the two horizontal parts are vertically corresponding, and the center point of the cross-shaped structure is on the axis of the filter screen.

[0017] The first vertical section of the support frame has a straight rod shaped like an umbrella rib, and its two ends are respectively fixedly connected to the four extension ends of the cross-shaped structure corresponding to the first horizontal section and the second horizontal section, and the connection position is between the center point of the cross-shaped structure and the end of the extension end of the cross-shaped structure.

[0018] The upper end of the straight rod of the second vertical part of the support frame is connected to the center point of the cross-shaped structure of the second horizontal part, and the lower end of the straight rod is connected to the center point of the upper surface of the cylindrical part of the fixing block.

[0019] Furthermore, the differential pressure detection unit includes a debris-side sampling point, a clean-side sampling point, a pressure guiding pipe, a differential pressure transmitter, a bracket, and a sampling point filter; the debris-side sampling point is located on the side wall of the filter body, and the clean-side sampling point is located on the side wall of the discharge pipe; both the debris-side sampling point and the clean-side sampling point are connected to the differential pressure transmitter through the pressure guiding pipe, the differential pressure transmitter is fixedly installed on the bracket, and the sampling point filter is located at the end of the debris-side sampling point and the clean-side sampling point near the filter body.

[0020] Furthermore, the intelligent debris cleaning unit also includes a high-pressure air source pipeline and an electromagnetic pulse valve; the high-pressure air source pipeline is connected to the blow pipe, the blow pipe is inclinedly arranged on the outer wall of the cleaning pipeline, and the high-pressure air source pipeline is equipped with an electromagnetic pulse valve.

[0021] Furthermore, N spray pipes are evenly distributed in a ring on the cleaning pipe. The spray pipes are fixedly and inclined to the side wall of the cleaning pipe. The spray pipes have a hollow structure and the inner cavity of the spray pipes is connected to the inner cavity of the cleaning pipe.

[0022] Furthermore, an online pneumatic conveying pipeline filter also includes a control unit, which is connected via circuits to the drive motors of a differential pressure transmitter, an electromagnetic pulse valve, a pressure relief valve, and a debris cleaning side valve.

[0023] Beneficial Effects: This utility model, an online pneumatic conveying pipeline filter, achieves real-time monitoring and automatic cleaning of blockages through the linkage of a differential pressure detection unit and an intelligent cleaning system. This reduces the frequency of manual inspections, improves cleaning efficiency, and eliminates the need to interrupt the conveying process. The filter element, using a combination of a conical filter screen and an umbrella-shaped support frame, increases the effective filtration area and enhances pressure resistance through the flange sealing structure of the fixing block and annular pressure plate, reducing filtration resistance. Furthermore, the support frame disperses airflow impact force, extending the filter element's service life. The horizontal inlet / outlet design of the feed tee elbow and the vertical filtration channel adapt to various pipeline layouts. Dual pressure control via a pressure relief valve and a pneumatic gate valve avoids the risk of system overpressure during cleaning, ensuring production safety. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an online pneumatic conveying pipeline filter according to this utility model.

[0025] Reference numerals in the attached diagram: 1. Filter body; 2. Feed tee elbow; 3. Filter element; 4. Differential pressure detection unit; 5. Intelligent debris cleaning unit; 6. Debris cleaning side valve; 81. Feed pipe; 82. Discharge pipe; 9. Pressure relief valve; 21. Material inlet channel; 22. Filter channel; 23. Debris outlet channel; 31. Annular pressure plate; 32. Support frame; 33. Filter screen; 34. Fixing block; 41. Debris side sampling point; 42. Clean side sampling point; 43. Pressure guide pipe; 44. Differential pressure transmitter; 45. Bracket; 46. Sampling point filter; 51. High-pressure air source pipeline; 52. Blow-through pipe; 53. Electromagnetic pulse valve; 55. Clean-through pipe. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to preferred embodiments. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0027] The accompanying drawings are schematic diagrams of embodiments of the present invention. It should be noted that these drawings are for illustrative purposes only and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0028] This utility model provides an online pneumatic conveying pipeline filter, such as... Figure 1As shown, the filter includes a filter body 1, a feed tee elbow 2, a filter element 3, and an intelligent debris cleaning unit 5. The filter body 1 has a hollow inner cavity, and the filter element 3 is disposed in the inner cavity of the filter body 1. The upper end of the filter body 1 is connected to the intelligent debris cleaning unit 5, and the lower end of the filter body 1 is connected to the feed tee elbow 2.

[0029] The filter body 1 is a vertically arranged hollow cylindrical structure. The upper end is fixedly connected to the intelligent debris cleaning unit 5 via a flange, and the lower end is fixedly connected to the feed tee elbow 2 via a flange. The feed tee elbow 2 is a hollow tee elbow, including a horizontally arranged material inlet channel 21, a horizontally arranged debris outlet channel 23, and a vertically extending filter channel 22. The material inlet channel 21 is fixedly connected to the feed pipe 81 via a flange. The upper end of the filter channel 22 is fixedly connected to the filter body 1 via a flange, and the filter channel 22 communicates with the inner cavity of the filter body 1. The end of the debris outlet channel 23 is provided with a debris cleaning side valve 6, which is a pneumatic gate valve. The valve plate of the debris cleaning side valve 6 is fixed to the outlet flange of the debris outlet channel 23 by bolts.

[0030] The filter element 3 is disposed within the inner cavity of the filter body 1. The filter element 3 includes an annular pressure plate 31, a support frame 32, a filter screen 33, and a fixing block 34. The filter screen 33 is a hollow conical funnel shape, wider at the top and narrower at the bottom, and open at both ends. The axis of the filter screen 33 coincides with the axis of the filter body 1. The surface of the filter screen 33 has a hollow mesh structure for filtering materials. The upper edge of the filter screen 33 is connected to the inner diameter of the annular pressure plate 31. The annular pressure plate 31 is disposed between the flange that fixes the filter body 1 and the intelligent debris cleaning unit 5. The inner diameter of the annular pressure plate 31 is equal to the inner diameter of the flange that fixes the filter body 1 and the intelligent debris cleaning unit 5, and the outer diameter of the annular pressure plate 31 is smaller than the outer diameter of the flange that fixes the filter body 1 and the intelligent debris cleaning unit 5. A sealing gasket is provided between the annular pressure plate 31 and the flange that fixes the filter body 1 and the intelligent debris cleaning unit 5 to prevent gas leakage. The lower end of the filter screen 33 is fixedly connected to the fixing block 34. The fixing block 34 is a solid structure and includes a cylindrical part and a conical part. The cylindrical part is located at the upper end of the fixing block 34 and is fixedly connected to the lower end of the filter screen 33. The conical part is located at the lower end of the fixing block 34 and is in an inverted state. The circular bottom surface of the conical part is connected to the lower end of the cylindrical part, and the bottom surface of the cylindrical part is equal to the circular bottom surface of the conical part. The axis of the fixing block 34 coincides with the axis of the filter screen 33. The support frame 32 is located in the hollow inner cavity of the filter screen 33. The support frame 32 includes two horizontal parts and two vertical parts. The first horizontal part is located on a horizontal surface flush with the annular pressure plate 31. Its width is equal to the thickness of the annular pressure plate 31. The structure is a cross-shaped structure composed of two horizontally placed straight rods, and the ends of the four extensions of the cross-shaped structure are fixedly connected to the inner surface of the inner diameter of the annular pressure plate 31. The second horizontal section is positioned between the upper and lower ends of the filter 33. The exact location of this second horizontal section between the upper and lower ends of the filter 33 is not specifically defined here. It has a cross-shaped structure composed of two horizontally placed straight rods, with the four extended ends of the cross-shaped structure fixedly connected to the inner surface of the filter 33. The two horizontal sections have corresponding cross-shaped structures, with the center point of the cross-shaped structure on the axis of the filter 33. The first vertical section includes four straight rods, each with its two ends fixedly connected to the four corresponding extended ends of the corresponding cross-shaped structures of the two horizontal sections. The connection position is between the center point of the cross-shaped structure and the end of the extended end of the cross-shaped structure; the specific connection position is not specifically defined here. The four straight rods are arranged in an umbrella-like shape. The second vertical section includes one vertically placed straight rod. The upper end of the straight rod is connected to the center point of the cross-shaped structure of the second horizontal section, and the lower end of the straight rod is connected to the center point of the upper surface of the cylindrical portion of the fixing block 34.The support frame 32 is used to fix the filter screen 33 and the fixing block 34 to prevent the filter screen 33 from shaking or deforming.

[0031] A pneumatic conveying online pipeline filter further includes a differential pressure detection unit 4, which includes a debris-side sampling point 41, a clean-side sampling point 42, a pressure guiding pipe 43, a differential pressure transmitter 44, a bracket 45, and a sampling point filter 46. The debris-side sampling point 41 is located on the side wall of the filter body 1, and the clean-side sampling point 42 is located on the side wall of the discharge pipe 82. Both the debris-side sampling point 41 and the clean-side sampling point 42 are connected to the differential pressure transmitter 44 through the pressure guiding pipe 43. The differential pressure transmitter 44 is fixedly mounted on the bracket 45. The bracket 45 is an L-shaped steel plate, with its horizontal section welded to the outer wall of the discharge pipe 82, and its vertical section fixed to the differential pressure transmitter 44 by bolts. The sampling point filter 46 is disposed at the end of the sampling point 41 on the debris side and the sampling point 42 on the clean side, near the filter body 1. It has a hollow filter screen structure. The shape and size of the sampling point filter 46 match the shape and size of the ends of the sampling points 41 on the debris side and the sampling point 42 on the clean side, near the filter body 1, and is used to filter materials and prevent the sampling points 41 on the debris side and the sampling point 42 on the clean side from becoming clogged.

[0032] A pressure relief valve 9 is provided on the side wall of the filter body 1 to release the pressure in the inner cavity of the filter body 1.

[0033] The intelligent debris cleaning unit 5 includes a high-pressure air source pipeline 51, a blowpipe 52, an electromagnetic pulse valve 53, and a cleaning pipeline 55. The cleaning pipeline 55 is a hollow conical funnel shape, narrower at the top and wider at the bottom, and extends vertically. The lower end of the cleaning pipeline 55 is fixedly connected to the filter body 1 via a flange, and the upper end of the cleaning pipeline 55 is fixedly connected to the discharge pipeline 82 via a flange. N blowpipes 52 are evenly distributed in a ring on the cleaning pipeline 55, where N≥2. The blowpipes 52 are obliquely fixed to the side wall of the cleaning pipeline 55, and their axes intersect with the filter screen 33. Preferably, the angle between the blowpipes 52 and the outer surface of the side wall of the cleaning pipeline 55 is 25°~75°. The blowpipes 52 have a hollow structure, and their inner cavity communicates with the inner cavity of the cleaning pipeline 55.

[0034] The high-pressure gas source pipeline 51 is connected to the blow pipe 52. The high-pressure gas source pipeline 51 is equipped with an electromagnetic pulse valve 53, which is used to control the opening and closing of the blow pipe 52.

[0035] A pneumatic conveying online pipeline filter also includes a control unit, which is connected via circuits to the drive motors of a differential pressure transmitter 44, an electromagnetic pulse valve 53, a pressure relief valve 9, and a debris cleaning side valve 6.

[0036] In this invention, all flanges are connected by bolts. Sealing gaskets are also provided between the flanges to prevent gas leakage.

[0037] Working principle:

[0038] The two-phase flow of the conveying medium and gas enters the feed tee elbow from the material inlet channel, and flows upward through the elbow to the filter body. Normal powder or small particulate materials pass through the filter element and continue to be conveyed along the discharge pipe. The filter element adopts a hollow conical funnel-shaped filter screen with a hollow mesh structure on its surface, which can effectively intercept large particles and high specific gravity materials. The intercepted debris falls to the bottom of the elbow under gravity and accumulates at the valve of the debris outlet channel under the push of the airflow.

[0039] The sampling points on the debris side and the clean side are connected to a differential pressure transmitter via pressure guide pipes to monitor the differential pressure in real time. When the differential pressure exceeds the set threshold, it indicates severe filter element blockage. The differential pressure transmitter transmits a signal to the control unit, triggering an automatic unblocking program. After the automatic unblocking program is started, the electromagnetic pulse valve opens the high-pressure air source pipeline, and high-pressure gas impacts the filter screen surface through the blowpipe. The blown airflow covers the filter element in an umbrella shape, peeling off the blockages or caking materials attached to the filter screen pores. During the unblocking process, the pressure relief valve opens simultaneously to release the pressure inside the filter cavity, ensuring the efficient penetration of the clean airflow. The debris after unblocking flows in the reverse direction with the airflow to the bottom of the elbow and is discharged from the system through the pneumatic gate valve in the debris outlet channel. The valve opening and closing is automatically controlled by the control unit and is linked to the unblocking program to prevent material backflow during the unblocking process.

[0040] If the differential pressure still exceeds the limit after multiple automatic unclogging attempts, the system will issue a shutdown prompt. Operators can then close the debris removal valve, disassemble the flange connection, and directly remove the filter element for manual cleaning.

[0041] This utility model provides an online pneumatic conveying pipeline filter that achieves real-time monitoring and automatic cleaning of blockages through the linkage of a differential pressure detection unit and an intelligent cleaning system. This reduces the frequency of manual inspections, improves cleaning efficiency, and eliminates the need to interrupt the conveying process. The filter element combines a conical filter screen with an umbrella-shaped support frame, increasing the effective filtration area and enhancing pressure resistance through a flange sealing structure of a fixing block and annular pressure plate, thus reducing filtration resistance. The support frame also disperses airflow impact, extending the filter element's service life. The horizontal inlet / outlet design of the feed tee elbow and the vertical filtration channel adapt to various pipeline layouts. Dual pressure control via a pressure relief valve and a pneumatic gate valve avoids the risk of system overpressure during cleaning, ensuring production safety.

[0042] The above description illustrates preferred embodiments of the present invention and helps those skilled in the art to more fully understand the technical solution of the present invention. However, these embodiments are merely illustrative and should not be construed as limiting the specific implementation of the present invention to these embodiments. For those skilled in the art, several simple deductions and modifications can be made without departing from the concept of the present invention, and all such modifications should be considered to fall within the protection scope of the present invention.

Claims

1. A pneumatic conveying in-line pipe filter, characterized in that, The filter includes a filter body, a feed tee elbow, a filter element, an intelligent debris cleaning unit, and a differential pressure detection unit. The filter body has a hollow inner cavity, and the filter element is disposed in the inner cavity of the filter body. The upper end of the filter body is connected to the intelligent debris cleaning unit, and the lower end of the filter body is connected to the feed tee elbow. The filter element includes a filter screen; the filter screen is a hollow conical funnel shape, the axis of the filter screen coincides with the axis of the filter body, and the surface of the filter screen is a perforated mesh; a support frame is disposed in the hollow inner cavity of the filter screen; The intelligent debris cleaning unit includes a blow pipe and a cleaning pipe; the cleaning pipe is a hollow conical funnel shape, the lower end of the cleaning pipe is connected to the filter body, and the upper end of the cleaning pipe is connected to the discharge pipe; the blow pipe is inclinedly arranged on the outer wall of the cleaning pipe.

2. A pneumatic conveying in-line pipe filter according to claim 1, characterized in that The feed tee elbow is a hollow tee elbow, including a horizontally arranged material inlet channel, a horizontally arranged debris outlet channel, and a vertically upward-extending filter channel. The material inlet channel is connected to the feed pipe, and the upper end of the filter channel is connected to the filter body, and the filter channel communicates with the inner cavity of the filter body.

3. A pneumatic conveying in-line pipe filter according to claim 1, characterized in that The filter element also includes an annular pressure plate and a fixing block; the upper edge of the filter screen is connected to the inner diameter of the annular pressure plate, and the annular pressure plate is disposed between the filter body and the intelligent debris blowing unit. The lower end of the filter screen is fixedly connected to the fixing block, and the axis of the fixing block coincides with the axis of the filter screen; The support frame includes a horizontal part and a vertical part; the first horizontal part is set on a horizontal surface flush with the annular pressure plate, the second horizontal part is set between the upper and lower ends of the filter screen, the two ends of the straight rod of the first vertical part are respectively fixedly connected to the four extension ends of the horizontal part, the upper end of the straight rod of the second vertical part is connected to the center point of the second horizontal part, and the lower end of the straight rod of the second vertical part is connected to the center point of the upper surface of the fixing block.

4. The pneumatic conveying online pipeline filter according to claim 3, characterized in that, The inner diameter of the annular pressure plate is equal to the inner diameter of the flange that fixes the filter body and the intelligent debris cleaning unit, and the outer diameter of the annular pressure plate is smaller than the outer diameter of the flange that fixes the filter body and the intelligent debris cleaning unit.

5. A pneumatic conveying in-line pipe filter according to claim 3, wherein, The fixing block includes a cylindrical part and a conical part. The cylindrical part is disposed at the upper end of the fixing block and is fixedly connected to the lower end of the filter screen. The conical part is disposed at the lower end of the fixing block and is in an inverted state. The circular bottom surface of the conical part is connected to the lower end of the cylindrical part, and the bottom surface of the cylindrical part is equal to the circular bottom surface of the conical part.

6. A pneumatic conveying in-line pipe filter according to claim 3, characterized in that The first horizontal part of the support frame is a horizontally placed cross-shaped structure with a width equal to the thickness of the annular pressure plate, and the ends of the four extended ends of the cross-shaped structure are fixedly connected to the inner surface of the inner diameter of the annular pressure plate. The second horizontal part of the support frame is a horizontally placed cross-shaped structure, and the ends of the four extended ends of the cross-shaped structure are fixedly connected to the inner surface of the filter screen; the cross-shaped structures of the two horizontal parts are vertically corresponding, and the center point of the cross-shaped structure is on the axis of the filter screen. The first vertical section of the support frame has a straight rod shaped like an umbrella rib, and its two ends are respectively fixedly connected to the four extension ends of the cross-shaped structure corresponding to the first horizontal section and the second horizontal section, and the connection position is between the center point of the cross-shaped structure and the end of the extension end of the cross-shaped structure. The upper end of the straight rod of the second vertical part of the support frame is connected to the center point of the cross-shaped structure of the second horizontal part, and the lower end of the straight rod is connected to the center point of the upper surface of the cylindrical part of the fixing block.

7. A pneumatic conveying in-line pipe filter according to claim 1, characterized in that The differential pressure detection unit includes a debris-side sampling point, a clean-side sampling point, a pressure guiding pipe, a differential pressure transmitter, a bracket, and a sampling point filter. The debris-side sampling point is located on the side wall of the filter body, and the clean-side sampling point is located on the side wall of the discharge pipe. Both the debris-side sampling point and the clean-side sampling point are connected to the differential pressure transmitter through the pressure guiding pipe. The differential pressure transmitter is fixedly installed on the bracket, and the sampling point filter is located at the end of the debris-side sampling point and the clean-side sampling point near the filter body.

8. A pneumatic conveying in-line pipe filter according to claim 1, characterized in that The intelligent debris cleaning unit also includes a high-pressure air source pipeline and an electromagnetic pulse valve; the high-pressure air source pipeline is connected to the blow pipe, the blow pipe is inclinedly arranged on the outer wall of the cleaning pipeline, and the high-pressure air source pipeline is equipped with an electromagnetic pulse valve.

9. A pneumatic conveying in-line pipe filter according to claim 8, characterized in that N jet pipes are evenly distributed in a ring on the cleaning pipe. The jet pipes are fixedly and inclined to the side wall of the cleaning pipe. The jet pipes have a hollow structure and the inner cavity of the jet pipes is connected to the inner cavity of the cleaning pipe.

10. A pneumatic conveying in-line pipe filter according to claim 1, characterized in that It also includes a control unit, which is connected via circuits to the drive motors of the differential pressure transmitter, the electromagnetic pulse valve, the pressure relief valve, and the debris cleaning side valve.

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