A filter rod long-distance conveying pipe structure and a conveying method thereof

Abstract

This invention belongs to the field of pipe fittings, specifically a long-distance filter rod conveying pipe structure and its conveying method. It includes a filter rod conveying gun barrel and a filter rod conveying steel pipe. An annular ejector is installed between the filter rod conveying steel pipe and the filter rod conveying gun barrel. A throttle exhaust valve assembly and a replenishing air valve assembly are installed below the annular ejector. The beneficial effects of this invention are: first, it ensures that compressed air does not flow back into the filter rod conveying steel pipe; second, adjusting the distance between the throttle exhaust valve seat and the throttle exhaust valve core allows for adjustment of the airflow rate by increasing the outlet area of ​​the second exhaust groove; third, the lower end of the second exhaust groove, which contains filter rod fiber dust, is easily cleaned with compressed air; and fourth, the pressure fluctuation at the inlet end of the filter rod conveying steel pipe is reduced by replenishing compressed air into the filter rod conveying steel pipe through the annular ejector.

Description

Technical Field

[0001] This invention belongs to the field of pipe fittings, and in particular to a long-distance filter rod conveying pipe structure and its conveying method. Background Technology

[0002] The working principle of the launching unit of the existing filter rod pneumatic conveying device is as follows: As the feed rollers rotate, the filter rods in the hopper of the transmitter fall into the groove of the launching drum in an orderly manner. The launching drum rotates counterclockwise, bringing the filter rods in the groove above the sealing block.

[0003] Compressed air enters the sealing block from the ventilation pipe below the sealing block, exits from the first slot of the sealing block, and then enters the launching drum from the second slot of the launching drum. It then flows through the round hole and reaches the slot of the launching drum. The high-speed flowing compressed air pushes the filter rod in the slot of the launching drum to move at high speed towards the third slot of the rear positioning wheel, the flare, and the filter rod delivery gun barrel, and finally sends the filter rod into the filter rod delivery steel pipe.

[0004] To propel the filter rods in the slots of the launching drum at high speed, a large amount of compressed air is required instantaneously. This compressed air is discharged into the atmosphere through three points: first, the gap between the launching drum and the rear positioning wheel; second, the gap between the rear positioning wheel and the bell mouth; and third, the filter rod delivery pipe. Measurements show that the amount of compressed air discharged through the third point accounts for approximately 20% of the total compressed air volume. During one filter rod launching cycle, as the launching drum rotates, the first slot of the sealing block begins to connect with the second slot of the launching drum, and compressed air begins to enter the launching drum. When the first slot of the sealing block aligns with the second slot of the launching drum, compressed air begins to enter the launching drum. The amount of compressed air entering the drum is the largest. When the first groove of the sealing block is completely misaligned with the second groove of the launching drum, the compressed air stops entering the launching drum. This indicates that the air pressure at the inlet of the filter rod conveying steel pipe fluctuates. When compressed air begins to enter the launching drum, the air pressure at the inlet of the filter rod conveying steel pipe begins to increase. When the first groove of the sealing block is aligned with the second groove of the launching drum, the air pressure at the inlet of the filter rod conveying steel pipe reaches its highest value. When the first groove of the sealing block is completely misaligned with the second groove of the launching drum, due to the three outlets, the air pressure at the inlet of the filter rod conveying steel pipe continuously decreases, reaching its lowest value before the first groove of the sealing block and the second groove of the launching drum begin to connect.

[0005] Currently, in existing pneumatic conveying devices for filter rods, the filter rods can be conveyed up to 300 meters in the filter rod conveying steel pipe. The filter rod conveying steel pipe has a buffering and air storage function for compressed air. When the first groove of the sealing block is completely misaligned with the second groove of the launching drum, there are three outlets. If the filter rod conveying steel pipe is too long, the air pressure in the middle part of the filter rod conveying steel pipe will be greater than the minimum air pressure at the inlet end of the filter rod conveying steel pipe. This will cause the compressed air in the filter rod conveying steel pipe to flow back, resulting in the filter rods not being launched. Summary of the Invention

[0006] To address the problem of transporting filter rods in longer filter rod transport pipes, this invention proposes a long-distance filter rod transport pipeline structure and its transport method.

[0007] This long-distance filter rod conveying pipeline structure includes a filter rod conveying gun barrel 1 and a filter rod conveying steel pipe 2. The feature is that an annular ejector is installed between the filter rod conveying steel pipe and the filter rod conveying gun barrel, and a throttling exhaust valve group and a replenishing air valve group are installed below the annular ejector.

[0008] Preferably, the annular ejector includes an annular ejector nozzle and an annular ejector receiver. The annular ejector nozzle, the annular ejector receiver, and the filter rod delivery gun are connected in sequence. The outlet end of the annular ejector receiver is connected to the filter rod delivery steel pipe. A throttling exhaust valve group is installed below the annular ejector nozzle, and a replenishing air valve group is installed below the annular ejector receiver. The filter rod delivery channel at the center of the filter rod delivery gun, the annular ejector nozzle, the annular ejector receiver, and the filter rod delivery steel pipe is connected. A first pressure gauge is installed near the outlet of the annular ejector nozzle through a third pipe on the annular ejector receiver.

[0009] Furthermore, the left end of the filter rod delivery gun barrel is embedded in the annular ejector nozzle, and the left end of the annular ejector nozzle is embedded in the annular ejector receiver. A throttle exhaust valve assembly is installed below the annular ejector nozzle at the embedded section of the filter rod delivery gun barrel and the annular ejector nozzle. This throttle exhaust valve assembly allows compressed air from the filter rod delivery steel pipe to enter the throttle exhaust valve assembly. An air replenishment structure is provided at the junction of the annular ejector nozzle and the annular ejector receiver. This air replenishment structure allows compressed air from the air replenishment valve assembly to enter the filter rod delivery channel. An exhaust structure is provided on the embedded section of the filter rod delivery gun barrel and the annular ejector nozzle. This exhaust structure allows compressed air from the filter rod delivery steel pipe to enter the throttle exhaust valve assembly.

[0010] Preferably, the air replenishment structure includes a left part of the junction section of the annular ejector nozzle and the annular ejector receiver, which is shaped like a truncated cone. With the axis of the filter rod conveying channel as the center, several circumferentially evenly distributed inclined ejector holes are arranged around the outside of the truncated cone. A first annular groove is opened on the right side of the truncated cone surface, and the first annular groove connects the air replenishment valve assembly with the ejector holes.

[0011] Preferably, the exhaust structure includes a vent hole evenly distributed in an annular pattern at the left end of the embedded section of the filter rod delivery gun barrel and the annular ejector nozzle, and a first exhaust groove evenly distributed in an annular pattern on the upper left side of the embedded section of the filter rod delivery gun barrel. Compressed air exits from the vent hole and passes through the first exhaust groove to reach the throttle exhaust valve assembly.

[0012] Preferably, the throttle exhaust valve assembly includes a first pipe, a first connector, a throttle exhaust valve seat, and a throttle exhaust valve core. The upper end of the first pipe is connected to an annular ejector nozzle, and the lower end of the first pipe is connected to the first connector. The first connector is installed on the throttle exhaust valve seat, and the throttle exhaust valve core is slidably embedded in the throttle exhaust valve seat. The throttle exhaust valve core has a second exhaust groove with a triangular vertical cross-section. The upper end of the second exhaust groove is connected to the first connector, and the lower end of the second exhaust groove is connected to the outside.

[0013] Preferably, the air replenishment valve assembly includes a pressure reducing valve, a second pressure gauge, a check valve, a throttle valve, a second pipe, and a second connector. The upper end of the second pipe is connected to the lower part of the annular ejector receiver, and the lower end of the second pipe is connected to the second connector. The throttle valve is connected below the second connector, and a check valve is installed below the throttle valve. The pressure reducing valve is installed below the check valve, and the second pressure gauge is installed on the pressure reducing valve.

[0014] A method for conveying filter rods in a long-distance filter rod conveying pipeline is characterized by the following steps: The filter rods are sequentially conveyed through a filter rod conveying gun barrel and an annular ejector by compressed air to a filter rod conveying steel pipe. A portion of the compressed air enters the throttle exhaust valve group and is discharged into the atmosphere through the vent hole and first exhaust groove of the filter rod conveying gun barrel. The remaining compressed air is supplied to the inlet end of the filter rod conveying steel pipe through a replenishing air valve group and the annular ejector. Because the exhaust from the throttle exhaust valve group causes the pressure at the inlet end of the filter rod conveying gun barrel to be greater than the value of the first pressure gauge, the replenishing air valve group is adjusted so that the value of the second pressure gauge is greater than the median value of the pressure fluctuation at the inlet end of the filter rod conveying gun barrel. The replenishing air valve group is also adjusted so that the flow rate of the replenished compressed air is half the average flow rate of the compressed air in the filter rod conveying steel pipe. When the value of the first pressure gauge is lower than the value of the second pressure gauge, compressed air is supplied to the inlet end of the filter rod conveying steel pipe, creating a pressure difference in the annular ejector. This pressure difference ensures that the air pressure at the inlet end of the filter rod conveying steel pipe is always greater than the air pressure in the middle of the filter rod conveying steel pipe.

[0015] Furthermore, compressed air propels the filter rods sequentially through the filter rod delivery gun barrel, the annular ejector nozzle, and the annular ejector receiver before reaching the filter rod delivery steel pipe. A portion of the compressed air enters the throttle exhaust valve assembly through the vent hole and the first exhaust groove of the filter rod delivery gun barrel. It then passes sequentially through the first pipe, the first connector, the throttle exhaust valve seat, and the throttle exhaust valve core within the throttle exhaust valve assembly, finally being discharged into the atmosphere through the second exhaust groove on the throttle exhaust valve core. Adjusting the throttle exhaust valve assembly strictly controls the amount of compressed air discharged, serving two purposes: First, it ensures sufficient pressure in the filter rod delivery gun barrel, allowing for a fast flow of compressed air in the filter rod delivery steel pipe, enabling the compressed air to move the filter rods. Second, when the air pressure at the inlet of the filter rod delivery steel pipe reaches its minimum value, the air pressure in the middle of the filter rod delivery steel pipe is higher than the minimum pressure at the inlet, causing backflow of compressed air in the filter rod delivery gun barrel. However, due to the exhaust from the throttle exhaust valve assembly, the compressed air in the filter rod delivery gun barrel does not flow back. Additionally, compressed air is supplied to the inlet of the filter rod conveying steel pipe through the air supply valve assembly and the ejector hole on the annular ejector nozzle. In the air supply valve assembly, the compressed air passes sequentially through the pressure reducing valve, check valve, throttle valve, second pipe, and second connector. By adjusting the distance L between the throttle exhaust valve seat and the throttle exhaust valve core, the pressure at the inlet of the filter rod conveying gun tube is made greater than the value of the first pressure gauge. The pressure reducing valve is adjusted so that the value of the second pressure gauge is greater than the median value of the pressure fluctuation at the inlet of the filter rod conveying gun tube. The throttle valve is adjusted so that the flow rate of the supplied compressed air is half of the average flow rate of the compressed air in the filter rod conveying steel pipe. When the value of the first pressure gauge is lower than the value of the second pressure gauge, compressed air is supplied to the inlet of the filter rod conveying steel pipe. According to the principle of air ejection, a negative pressure area is formed in the direction of filter rod feeding near the ejector hole, and a positive pressure area is formed in the direction of filter rod discharge near the ejector hole, thereby generating a pressure difference. The pressure difference ensures that the air pressure at the inlet of the filter rod conveying steel pipe is always greater than the air pressure in the middle of the filter rod conveying steel pipe.

[0016] The beneficial effects of this invention are as follows: First, the pressure difference generated by the annular ejector ensures that the air pressure at the inlet of the filter rod conveying steel pipe is always greater than the air pressure in the middle of the filter rod conveying steel pipe, thus preventing backflow of compressed air in the filter rod conveying steel pipe. Second, adjusting the distance between the throttle exhaust valve seat and the throttle exhaust valve core can increase the air outlet area of ​​the second exhaust groove, thereby regulating the airflow. Third, since there is filter rod fiber dust in the compressed air, the lower end of the second exhaust groove is outside, making it convenient to clean with compressed air. Fourth, by supplementing the filter rod conveying steel pipe with compressed air through the annular ejector, the pressure fluctuation at the inlet of the filter rod conveying steel pipe is reduced, and the average pressure at the inlet of the filter rod conveying steel pipe is slightly increased, making the movement of the filter rods in the filter rod conveying steel pipe more stable, and increasing the conveyable distance of the filter rods in the filter rod conveying steel pipe from the original 300m to 400m. Attached Figure Description

[0017] Figure 1Schematic diagram of the invention Figure 2 . Figure 1 Left view Figure 3 . Figure 1 Enlarged view A Figure 4 . Figure 1 Schematic diagram of the middle air supply valve assembly 1. Filter rod delivery gun barrel; 2. Filter rod delivery steel pipe; 3. Annular ejector; 3.1 Annular ejector nozzle; 3.2 Annular ejector receiver; 4. Throttle exhaust valve assembly; 4.1 First pipe; 4.2 First connector; 4.3 Throttle exhaust valve seat; 4.4 Throttle exhaust valve core; 4.4.1 Second exhaust groove; 5. Air replenishment valve assembly; 5.1 Pressure reducing valve; 5.2 Second pressure gauge; 5.3 Check valve; 5.4 Throttle valve; 5.5 Second pipe; 5.6 Second connector; 6. Third pipe; 6.1 First annular groove; 6.2 Ejector hole; 7. First pressure gauge; 7.1 Vent hole; 7.2 First exhaust groove; 8. Filter rod delivery channel. Detailed Implementation

[0018] This long-distance filter rod conveying pipeline structure includes a filter rod conveying gun barrel 1 and a filter rod conveying steel pipe 2. The feature is that an annular ejector 3 is installed between the filter rod conveying steel pipe 2 and the filter rod conveying gun barrel 1, and a throttling exhaust valve group 4 and a replenishing air valve group 5 are installed below the annular ejector 3.

[0019] The annular ejector 3 includes an annular ejector nozzle 3.1 and an annular ejector receiver 3.2. The annular ejector nozzle 3.1, the annular ejector receiver 3.2 and the filter rod conveying gun 1 are connected in sequence. The outlet end of the annular ejector receiver 3.2 is connected to the filter rod conveying steel pipe 2. A throttling exhaust valve group 4 is installed below the annular ejector nozzle 3.1 and a replenishing air valve group 5 is installed below the annular ejector receiver 3.2. The filter rod conveying channel 8 at the center of the filter rod conveying gun 1, the annular ejector nozzle 3.1, the annular ejector receiver 3.2 and the filter rod conveying steel pipe 2 is connected. The inlet end of the filter rod conveying steel pipe 2 is equipped with a first pressure gauge 7 through a third pipe 6.

[0020] The left end of the filter rod delivery gun barrel 1 is embedded in the annular ejector nozzle 3.1, and the left end of the annular ejector nozzle 3.1 is embedded in the annular ejector receiver 3.2. A throttle exhaust valve assembly 4 is installed below the annular ejector nozzle 3.1 in the embedded section, and a replenishment valve assembly 5 is installed below the annular ejector receiver 3.2 in the embedded section. A replenishment structure 6 is provided on the embedded section of the annular ejector nozzle 3.1. The replenishment structure 6 allows the compressed air from the replenishment valve assembly 5 to enter the filter rod delivery channel 8. An exhaust structure 7 is provided on the embedded section of the filter rod delivery gun barrel 1. The exhaust structure 7 allows the compressed air in the filter rod delivery channel 8 to enter the throttle exhaust valve assembly 4.

[0021] The air replenishment structure 6 includes an embedded section of an annular ejector nozzle 3.1 with the left part of the section being a truncated cone shape. With the axis of the filter rod conveying channel 8 as the center, several inclined ejector holes 6.2 are arranged circumferentially on the outside of the truncated cone. A first annular groove 6.1 is opened on the right side of the truncated cone surface, and the first annular groove 6.1 connects the air replenishment valve group 5 with the ejector holes 6.2.

[0022] The exhaust structure 7 includes a vent hole 7.1 evenly distributed in an annular pattern at the left end of the filter rod delivery gun barrel 1 embedding section, and a first exhaust groove 7.2 evenly distributed in an annular pattern on the upper left side of the filter rod delivery gun barrel 1 embedding section. Compressed air comes out from the vent hole 7.1 and passes through the first exhaust groove 7.2 to reach the throttle exhaust valve group 4.

[0023] The throttle exhaust valve assembly 4 includes a first pipe 4.1, a first connector 4.2, a throttle exhaust valve seat 4.3, and a throttle exhaust valve core 4.4. The upper end of the first pipe 4.1 is connected to an annular ejector nozzle 3.1, and the lower end of the first pipe 4.1 is connected to the first connector 4.2. The first connector 4.2 is installed on the throttle exhaust valve seat 4.3. The throttle exhaust valve core 4.4 is slidably embedded in the throttle exhaust valve seat 4.3. The throttle exhaust valve core 4.4 has a second exhaust groove 4.4.1. The vertical cross-section of the second exhaust groove 4.4.1 is triangular. The upper end of the second exhaust groove 4.4.1 is connected to the first connector 4.2, and the lower end of the second exhaust groove 4.4.1 is connected to the outside.

[0024] The air supply valve assembly 5 includes a pressure reducing valve 5.1, a second pressure gauge 5.2, a check valve 5.3, a throttle valve 5.4, a second pipe 5.5, and a second connector 5.6. The upper end of the second pipe 5.5 is connected to the lower part of the annular ejector receiver 3.2, and the lower end of the second pipe 5.5 is connected to the second connector 5.6. The throttle valve 5.4 is connected below the second connector 5.6. The check valve 5.3 is installed below the throttle valve 5.4, and the pressure reducing valve 5.1 is installed below the check valve 5.3. The second pressure gauge 5.2 is installed on the pressure reducing valve 5.1.

[0025] A method for conveying filter rods in a long-distance filter rod conveying pipeline structure is characterized by comprising using compressed air to sequentially pass the filter rods through a filter rod conveying gun 1 and an annular ejector 3 to reach the filter rod conveying steel pipe 2. A portion of the compressed air enters the throttle exhaust valve assembly 4 through the vent hole 7.1 and the first exhaust groove 7.2 of the filter rod conveying gun 1 and is discharged into the atmosphere. The remaining compressed air is supplied to the inlet end of the filter rod conveying steel pipe 2 through a supplementary air valve assembly 5 and the annular ejector 3. The pressure at the inlet end of the filter rod conveying gun 1 is increased by adjusting the throttle exhaust valve assembly 4 to a pressure greater than the first pressure. Adjust the pressure gauge 7 value and the air supply valve group 5 so that the value of the second pressure gauge 5.2 is greater than the median value of the pressure fluctuation at the inlet of the filter rod conveying gun 1. Adjust the air supply valve group 5 so that the flow rate of the supplemented compressed air is half of the average flow rate of the compressed air in the filter rod conveying steel pipe 2. When the value of the first pressure gauge 7 is lower than the value of the second pressure gauge 5.2, supplement the inlet of the filter rod conveying steel pipe 2 with compressed air, and generate a pressure difference in the annular ejector 3. The pressure difference makes the air pressure at the inlet of the filter rod conveying steel pipe 2 always greater than the air pressure in the middle part of the filter rod conveying steel pipe 2.

[0026] Compressed air propels the filter rod through the filter rod delivery gun 1, the annular ejector nozzle 3.1, and the annular ejector receiver 3.2 before reaching the filter rod delivery steel pipe 2. Part of the compressed air enters the throttle exhaust valve assembly 4 through the vent 7.1 and first exhaust groove 7.2 of the filter rod delivery gun 1. It then passes through the first pipe 4.1, first connector 4.2, throttle exhaust valve seat 4.3, and throttle exhaust valve core 4.4 within the throttle exhaust valve assembly 4, finally being discharged into the atmosphere through the second exhaust groove 4.4.1 on the throttle exhaust valve core 4.4. Additionally, compressed air is supplied to the inlet of the filter rod delivery steel pipe 2 through the air replenishment valve assembly 5 and the ejector hole 6.2 on the annular ejector nozzle 3.1. In the air replenishment valve assembly 5, the compressed air passes through the pressure reducing valve 5.1, one-way valve 5.3, throttle valve 5.4, second pipe 5.5, and second connector 5.6, and is regulated by the throttle valve. The distance L between the exhaust valve seat 4.3 and the throttle exhaust valve core 4.4 makes the pressure at the inlet of the filter rod conveying gun 1 greater than the value of the first pressure gauge 7. The pressure reducing valve 5.1 is adjusted so that the value of the second pressure gauge 5.2 is greater than the median value of the pressure fluctuation at the inlet of the filter rod conveying gun 1. The throttle valve 5.4 is adjusted so that the supplemented compressed air flow rate is half of the average compressed air flow rate in the filter rod conveying steel pipe 2. When the value of the first pressure gauge 7 is lower than the value of the second pressure gauge 5.2, compressed air is supplemented to the inlet of the filter rod conveying steel pipe 2. According to the air ejection principle, a negative pressure area is formed in the direction of filter rod feeding next to the ejection hole 6.2, and a positive pressure area is formed in the direction of filter rod discharge next to the ejection hole 6.2, thereby generating a pressure difference. The pressure difference ensures that the air pressure at the inlet of the filter rod conveying steel pipe 2 is always greater than the air pressure in the middle part of the filter rod conveying steel pipe 2.

Claims

1. A long-distance filter rod conveying pipeline structure, comprising a filter rod conveying gun barrel and a filter rod conveying steel pipe, characterized in that, An annular ejector is installed between the filter rod conveying steel pipe and the filter rod conveying gun barrel. A throttling exhaust valve group and a replenishing air valve group are installed below the annular ejector.

2. The filter rod long-distance conveying pipeline structure according to claim 1, characterized in that, The annular ejector includes an annular ejector nozzle and an annular ejector receiver. The annular ejector nozzle, annular ejector receiver, and filter rod delivery gun are connected in sequence. The outlet end of the annular ejector receiver is connected to the filter rod delivery steel pipe. A throttling exhaust valve group is installed below the annular ejector nozzle, and a replenishing air valve group is installed below the annular ejector receiver. The filter rod delivery channel at the center of the filter rod delivery gun, annular ejector nozzle, annular ejector receiver, and filter rod delivery steel pipe is connected. The inlet end of the filter rod delivery steel pipe is equipped with a first pressure gauge through a third pipe.

3. The filter rod long-distance conveying pipeline structure according to claim 2, characterized in that, The left end of the filter rod delivery gun barrel is embedded in the annular ejector nozzle, and the left end of the annular ejector nozzle is embedded in the annular ejector receiver. A throttle exhaust valve assembly is installed below the annular ejector nozzle in the embedded section, and a replenishment valve assembly is installed below the annular ejector receiver in the embedded section. A replenishment structure is provided on the embedded section of the annular ejector nozzle, which allows compressed air from the replenishment valve assembly to enter the filter rod delivery channel. An exhaust structure is provided on the embedded section of the filter rod delivery gun barrel, which allows compressed air in the filter rod delivery channel to enter the throttle exhaust valve assembly.

4. The filter rod long-distance conveying pipeline structure according to claim 3, characterized in that, Preferably, the air replenishment structure includes an embedded section of an annular ejector nozzle with a frustum-shaped left side. With the filter rod conveying channel axis as the center, several inclined ejector holes are arranged circumferentially on the outside of the frustum. A first annular groove is opened on the right side of the frustum surface, and the first annular groove connects the air replenishment valve assembly to the ejector holes.

5. The filter rod long-distance conveying pipeline structure according to claim 3, characterized in that, The exhaust structure includes annularly distributed vent holes at the left end of the filter rod delivery gun barrel embedding section, and annularly distributed first exhaust grooves on the upper left side of the filter rod delivery gun barrel embedding section. Compressed air exits from the vent holes and passes through the first exhaust grooves to reach the throttle exhaust valve assembly.

6. The filter rod long-distance conveying pipeline structure according to claim 3, characterized in that, The throttle exhaust valve assembly includes a first pipe, a first connector, a throttle exhaust valve seat, and a throttle exhaust valve core. The upper end of the first pipe is connected to an annular ejector nozzle, and the lower end of the first pipe is connected to the first connector. The first connector is installed on the throttle exhaust valve seat, and the throttle exhaust valve core is slidably embedded in the throttle exhaust valve seat. The throttle exhaust valve core has a second exhaust groove with a triangular vertical cross-section. The upper end of the second exhaust groove is connected to the first connector, and the lower end of the second exhaust groove is connected to the outside.

7. The filter rod long-distance conveying pipeline structure according to claim 3, characterized in that, The air supply valve assembly includes a pressure reducing valve, a second pressure gauge, a check valve, a throttle valve, a second pipe, and a second connector. The upper end of the second pipe is connected to the lower part of the annular ejector receiver, and the lower end of the second pipe is connected to the second connector. The throttle valve is connected below the second connector, and a check valve is installed below the throttle valve. The pressure reducing valve is installed below the check valve, and the second pressure gauge is installed on the pressure reducing valve.

8. A method for conveying filter rods in a long-distance filter rod conveying pipeline structure, characterized in that, The process involves using compressed air to propel the filter rods sequentially through the filter rod delivery gun barrel and the annular ejector to the filter rod delivery steel pipe. A portion of the compressed air enters the throttle exhaust valve assembly and is discharged into the atmosphere through the vent hole and first exhaust groove of the filter rod delivery gun barrel. The remaining compressed air is supplied to the inlet of the filter rod delivery steel pipe via the air replenishment valve assembly and the annular ejector. The throttle exhaust valve assembly is adjusted to ensure the pressure at the inlet of the filter rod delivery gun barrel is greater than the value of the first pressure gauge. The air replenishment valve assembly is adjusted to ensure the value of the second pressure gauge is greater than the median of the pressure fluctuations at the inlet of the filter rod delivery gun barrel. The air replenishment valve assembly is adjusted so that the flow rate of the replenished compressed air is half the average flow rate of the compressed air in the filter rod delivery steel pipe. When the value of the first pressure gauge is lower than the value of the second pressure gauge, compressed air is supplied to the inlet of the filter rod delivery steel pipe, creating a pressure difference in the annular ejector. This pressure difference ensures that the air pressure at the inlet of the filter rod delivery steel pipe is always greater than the air pressure in the middle of the filter rod delivery steel pipe.

9. The filter rod long-distance conveying pipeline structure according to claim 8, characterized in that, Compressed air propels the filter rod through the filter rod delivery barrel, annular ejector nozzle, and annular ejector receiver before reaching the filter rod delivery steel pipe. A portion of the compressed air enters the throttle exhaust valve assembly through the vent hole and first exhaust groove of the filter rod delivery barrel. It then passes sequentially through the first pipe, first connector, throttle exhaust valve seat, and throttle exhaust valve core within the throttle exhaust valve assembly, finally being discharged into the atmosphere through the second exhaust groove on the throttle exhaust valve core. Additionally, compressed air is supplied to the inlet end of the filter rod delivery steel pipe through the air replenishment valve assembly and the ejector hole on the annular ejector nozzle. In the air replenishment valve assembly, the compressed air passes sequentially through a pressure reducing valve, check valve, throttle valve, second pipe, and second connector. The distance between the throttle exhaust valve seat and the throttle exhaust valve core is adjusted... To ensure the pressure at the inlet of the filter rod conveying gun is greater than the value of the first pressure gauge, adjust the pressure reducing valve so that the value of the second pressure gauge is greater than the median value of the pressure fluctuation at the inlet of the filter rod conveying gun. Adjust the throttle valve so that the supplemented compressed air flow rate is half of the average compressed air flow rate in the filter rod conveying steel pipe. When the value of the first pressure gauge is lower than the value of the second pressure gauge, supplement compressed air to the inlet of the filter rod conveying steel pipe. According to the principle of air ejection, a negative pressure area is formed in the direction of filter rod feeding near the ejector hole, and a positive pressure area is formed in the direction of filter rod discharge near the ejector hole, thereby generating a pressure difference. The pressure difference ensures that the air pressure at the inlet of the filter rod conveying steel pipe is always greater than the air pressure in the middle of the filter rod conveying steel pipe.

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