Automatic blowing device for pneumatic conveying valve body

Abstract

The utility model provides an automatic blowing device for a pneumatic conveying valve body, and relates to the technical field of conveying valves. The valve comprises a valve body, a valve element, a driving assembly and a purging assembly, a material conveying pipe is arranged on the valve body, and a containing groove is formed in the inner wall of the material conveying pipe; the valve element is arranged in the containing groove, the driving assembly is in transmission connection with the valve element, and the driving assembly can drive the valve element to get close to and block the conveying pipe or get away from and open the conveying pipe; the blowing assembly is arranged on the inner wall of the containing groove and can blow materials attached to the inner wall of the containing groove to the material conveying pipe. The pneumatic conveying valve has the beneficial effects that materials adhering to the inner wall of the containing groove can be purged, and it is guaranteed that the materials are not accumulated in the containing groove, and normal opening of the pneumatic conveying valve is not affected.

Description

Technical Field

[0001] The present application relates to the technical field of conveying valves, and particularly to an automatic purging device for a pneumatic conveying valve body. Background Art

[0002] A pneumatic conveying valve is a conveying valve powered by high-pressure gas. This type of conveying valve is commonly used on pipelines for conveying slurries such as cement, so as to be able to control the on / off of the pipeline by using the pneumatic conveying valve.

[0003] Existing pneumatic conveying valves generally include a valve body, a valve core, and a driving cylinder. A feeding pipe is provided on the valve body. One side pipe orifice of the feeding pipe is connected to a pipe for feeding materials, and the other side pipe orifice of the feeding pipe is connected to a pipe for receiving materials. A receiving groove is formed on the inner wall of the feeding pipe. The valve core is arranged inside the receiving groove. The piston rod of the driving cylinder extends into the receiving groove through a through hole formed on the groove wall of the receiving groove and is connected to the valve core, so as to be able to drive the valve core to approach or move away from the feeding pipe by the driving cylinder, and use the valve core to block the feeding pipe to close the pneumatic conveying valve.

[0004] However, during each opening and closing process of the pneumatic conveying valve, a part of the slurry will enter the receiving groove along with the valve core and adhere to the inner wall of the receiving groove. When there is more slurry adhering to the inner wall of the receiving groove, this slurry will prevent the valve core from entering the receiving groove, thereby affecting the normal opening of the pneumatic conveying valve.

[0005] In view of this, an automatic purging device for a pneumatic conveying valve body is needed. Summary of the Utility Model

[0006] In order to solve the problem that after the existing pneumatic conveying valve is reused, more slurry will adhere to the valve body, affecting the normal opening of the pneumatic conveying valve, the present application provides an automatic purging device for a pneumatic conveying valve body.

[0007] The present application provides an automatic purging device for a pneumatic conveying valve body, adopting the following technical solution: It includes a valve body, a valve core, a driving component, and a purging component. A feeding pipe is provided on the valve body, and a receiving groove is formed on the inner wall of the feeding pipe;

[0008] The valve core is arranged in the receiving groove. The driving component is in transmission connection with the valve core, and the driving component can drive the valve core to approach and block the feeding pipe or move away and open the feeding pipe;

[0009] The purging component is arranged on the inner wall of the receiving groove and can blow the materials adhering to the inner wall of the receiving groove towards the feeding pipe.

[0010] By adopting the above technical solution, after connecting the two ends of the material conveying pipe to the liquid supply pipe for supplying slurry and the liquid receiving pipe for receiving slurry respectively, the user can control the on-off of the slurry flow in the material conveying pipe by driving the valve core to approach or move away from the material conveying pipe through the driving assembly; during the process of the valve core leaving and entering the receiving groove each time, a part of the slurry will enter the receiving groove along with the valve core and adhere to the inner wall of the receiving groove, and the purging assembly can blow the slurry adhered to the inner wall of the receiving groove back into the material conveying pipe to ensure that this slurry will not accumulate in the receiving groove and affect the normal opening of the pneumatic conveying valve.

[0011] Specifically, the driving assembly includes a reversing valve, a gas supply device and a cylinder. The reversing valve includes an air inlet and two air outlets. The gas supply device is connected to the air inlet through a pipeline. A communication hole is opened on the side groove wall of the receiving groove away from the material conveying pipe. The piston rod of the cylinder passes through the communication hole and is connected to the valve core. The cylinder block of the cylinder is arranged on the valve body, and an air rod extension port and an air rod retraction port are arranged on the cylinder block of the cylinder. The air rod extension port is connected to one of the two air outlets through a pipeline, and the air rod retraction port is connected to the other of the two air outlets through a pipeline.

[0012] By adopting the above technical solution, the user can adjust the gas supply state of the gas supply device through the reversing valve, so as to be able to drive the piston rod of the cylinder to extend out of the cylinder block and drive the valve core to block the material conveying pipe by controlling the reversing valve to allow the gas supply device to supply gas to the air rod extension port, or drive the piston rod of the cylinder to retract into the cylinder block and drive the valve core to move away from and open the material conveying pipe by controlling the reversing valve to allow the gas supply device to supply gas to the air rod retraction port.

[0013] Furthermore, the purging assembly includes a purging pipe and a time-delay valve. A purging hole leading to the outside of the valve body is opened on the groove wall of the receiving groove. One end of the purging pipe is connected to the purging hole, and the other end of the purging pipe is connected to the pipeline between the air rod retraction port and the reversing valve. The time-delay valve is arranged on the purging pipe. When the piston rod of the cylinder drives the valve core to retract into the receiving groove, the gas in the purging pipe can pass through the time-delay valve and blow the material adhered in the receiving groove from the gap between the valve core and the groove wall of the receiving groove towards the material conveying pipe.

[0014] By adopting the above technical solution, when the reversing valve allows the gas supply device to supply gas to the air rod retraction port, the gas supply device will also supply gas to the purging pipe at the same time, and the setting of the time-delay valve can delay the time for the gas in the purging pipe to reach the purging hole, so that when the piston rod of the cylinder drives the valve core to retract into the receiving groove, the gas in the purging pipe will pass through the time-delay valve to reach the purging hole and blow the slurry adhered in the receiving groove from the gap between the valve core and the groove wall of the receiving groove towards the material conveying pipe.

[0015] Further, the purging assembly further includes a check valve which is arranged on the purging pipe and located between the delay valve and the purging holes, and the check valve can prevent the gas in the accommodation groove from passing through the check valve.

[0016] By adopting the above technical solution, the check valve can prevent the gas in the accommodation groove from passing through the check valve, so as to ensure that the gas in the accommodation groove will not flow back into the purging pipe together with the slurry, thereby ensuring that the purging pipe and the equipment on the purging pipe will not be contaminated and damaged by the slurry.

[0017] Further, the delay valve is a mechanical delay valve, and an adjustment knob for adjusting the time required for the gas to pass through the mechanical delay valve is arranged on the mechanical delay valve.

[0018] By adopting the above technical solution, the user can adjust the time required for passing through the mechanical delay valve through the adjustment knob.

[0019] Further, the valve core includes a mounting sleeve, a compression spring and two plug heads. The mounting sleeve is arranged in the accommodation groove along the length direction of the material conveying pipe. The body of the mounting sleeve is connected to the piston rod of the air cylinder, and there is a gap between the body of the mounting sleeve and the groove wall of the accommodation groove. The compression spring is arranged in the mounting sleeve along the length direction of the mounting sleeve. Two abutting rings are oppositely arranged in the material conveying pipe. The mounting sleeve is located between the two abutting rings. The outer rings of the abutting rings are all connected to the inner wall of the material conveying pipe. The plug heads correspond to the abutting rings one by one. Each plug head is arranged between the end port of one end of the mounting sleeve and the corresponding abutting ring. When the mounting sleeve is located in the material conveying pipe, the compression spring can abut each plug head against the corresponding abutting ring and block the inner rings of the abutting rings.

[0020] By adopting the above technical solution, when the mounting sleeve is located in the material conveying pipe, the compression spring in the mounting sleeve will apply a force to the two plug heads to move away from each other, so as to be able to abut the two plug heads against the inner rings of the two abutting rings respectively, thereby being able to disconnect the slurry flow in the material conveying pipe through the cooperation of the two plug heads and the two abutting rings; when the mounting sleeve leaves the material conveying pipe and enters the accommodation groove, the slurry blown from the accommodation groove into the material conveying pipe by the air flow can pass through the gap between the body of the mounting sleeve and the groove wall of the accommodation groove.

[0021] Further, an annular air storage cavity is formed in the valve body around the central axis of the accommodation groove in the length direction. A through hole leading to the outside is formed in the outer cavity wall of the annular air storage cavity, and the through hole is connected to the purging pipe. A plurality of purging holes leading to the inside of the accommodation groove are formed in the inner cavity wall of the annular air storage cavity, and the purging holes are arranged around the central axis of the accommodation groove in the length direction.

[0022] By adopting the above technical solution, the gas in the purge tube will first enter the annular air storage cavity and then be evenly distributed to each purge hole. The purge holes arranged around the central axis of the receiving tank in the length direction can purge the slurry on each groove wall extending along the length direction of the receiving tank, so as to increase the purge efficiency of the purge assembly on the slurry in the receiving tank.

[0023] Furthermore, each of the purge holes is provided with fish scale holes at a side port close to the containing tank, and the opening of each of the fish scale holes faces the feed pipe.

[0024] By adopting the above technical solution, the gas passing through the purge holes will form an airflow along the openings of the fish scale holes and blow toward the feed pipe, so as to increase the purge capacity of these airflows on the slurry in the containing tank.

[0025] In summary, this application includes the following beneficial technical effects:

[0026] The utility model comprises a valve body, a valve core, a driving assembly and a purge assembly. The valve body is provided with a feed pipe, and a receiving groove is opened on the inner wall of the feed pipe; the valve core is arranged in the receiving groove, the driving assembly is connected to the valve core in a transmission manner, and the driving assembly can drive the valve core to approach and block the feed pipe or to move away from and open the feed pipe; the purge assembly is arranged on the inner wall of the receiving groove and can blow the material adhered to the inner wall of the receiving groove toward the feed pipe. After the two ends of the feed pipe are respectively connected to the liquid supply pipe for supplying the slurry and the liquid receiving pipe for receiving the slurry, the user can control the on-off of the slurry flow in the feed pipe by driving the valve core to approach or move away from the feed pipe through the driving assembly; each time the valve core leaves and enters the receiving groove, a part of the slurry will enter the receiving groove along with the valve core and adhere to the inner wall of the receiving groove, and the purge assembly can blow the slurry adhered to the inner wall of the receiving groove back into the feed pipe to ensure that the slurry will not accumulate in the receiving groove and affect the normal opening of the pneumatic conveying valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of an automatic purge device for a pneumatic conveying valve body of the present application;

[0028] Figure 2 is along Figure 1 Schematic cross-sectional view taken along the AA direction.

[0029] Figure numerals: 1. valve body; 11. feed pipe; 111. abutment ring; 12. accommodating groove; 13. annular air storage chamber; 131. fish scale hole; 2. valve core; 21. mounting sleeve; 22. compression spring; 23. plug; 3. drive assembly; 31. reversing valve; 32. air supply device; 33. cylinder; 331. air rod extension port; 332. air rod retraction port; 4. purge assembly; 41. purge pipe; 42. delay valve; 421. adjusting knob; 43. one-way valve. Detailed implementation mode

[0030] Figure 1 is a perspective view of an automatic purging device for a pneumatic conveying valve body of the present application, Figure 2 is along Figure 1 A schematic cross-sectional view taken along the A-A direction in. Refer to Figure 1 and Figure 2 An automatic purging device for a pneumatic conveying valve body provided by the present application includes: a valve body 1, a valve core 2, a driving assembly 3, and a purging assembly 4. A material conveying pipe 11 is provided on the valve body 1. A receiving groove 12 is opened on the inner wall of the material conveying pipe 11. A pair of abutting rings 111 are also provided in the material conveying pipe 11. The notch of the receiving groove 12 is located between the pair of abutting rings 111. The central axes of the abutting rings 111 coincide with the central axis of the material conveying pipe 11. These two abutting rings 111 can be made of rubber material; the valve core 2 includes a mounting sleeve 21, a compression spring 22, and two plugs 23. The mounting sleeve 21 is arranged in the receiving groove 12 along the length direction of the material conveying pipe 11, and there is a gap between the sleeve body of the mounting sleeve 21 and the groove wall of the receiving groove 12. The compression spring 22 is arranged in the mounting sleeve 21 along the length direction of the mounting sleeve 21. The plugs 23 correspond to the abutting rings 111 one by one. Each plug 23 is arranged between one end port of the mounting sleeve 21 and a corresponding abutting ring 111.

[0031] Refer to Figure 1 and Figure 2 The driving assembly 3 includes a reversing valve 31, a gas supply device 32, and a cylinder 33. The reversing valve 31 includes an air inlet and two air outlets. The gas supply device 32 is connected to the air inlet through a pipeline. A communication hole is opened on the groove wall of the receiving groove 12 on the side far from the material conveying pipe 11. The piston rod of the cylinder 33 passes through the communication hole and is connected to the valve core 2. The cylinder body of the cylinder 33 is arranged on the valve body 1, and an air rod extension port 331 and an air rod retraction port 332 are provided on the cylinder body of the cylinder 33. The air rod extension port 331 is connected to one of the two air outlets through a pipeline, and the air rod retraction port 332 is connected to the other of the two air outlets through a pipeline. The above reversing valve 31 can be an electromagnetic reversing valve, so that the user can adjust the gas supply state of the gas supply device 32 through the reversing valve 31, so as to be able to drive the piston rod of the cylinder 33 to extend out of the cylinder body by controlling the reversing valve 31 to allow the gas supply device 32 to supply gas to the air rod extension port 331, so as to drive the mounting sleeve 21 into the material conveying pipe 11 through the piston rod, so as to apply a force away from each other to the two plugs 23 through the compression spring 22 in the mounting sleeve 21 to respectively abut the two plugs 23 on the inner rings of the two abutting rings 111; the user can also drive the piston rod of the cylinder 33 to retract into the cylinder body and drive the mounting sleeve 21 into the receiving groove 12 by controlling the reversing valve 31 to allow the gas supply device 32 to supply gas to the air rod retraction port 332, so that the material conveying pipe 11 is in an open state.

[0032] Refer to Figure 1and Figure 2 The purging assembly 4 includes a purging pipe 41, a mechanical delay valve 42 and a one-way valve 43. An annular gas storage cavity 13 is formed in the valve body 1 around the central axis in the length direction of the accommodation groove 12. A through hole leading to the outside is formed in the outer cavity wall of the annular gas storage cavity 13, and this through hole is connected to one end of the purging pipe 41. The other end of the purging pipe 41 is connected to the pipeline between the air rod retraction port 332 and the reversing valve 31. A plurality of purging holes leading to the inside of the accommodation groove 12 are formed in the inner cavity wall of the annular gas storage cavity 13, and these purging holes are arranged at equal intervals around the central axis in the length direction of the accommodation groove 12, so that the gas in the purging pipe 41 will first enter the annular gas storage cavity 13 and then be evenly distributed into each purging hole. The purging holes arranged around the central axis in the length direction of the accommodation groove 12 can purge each groove wall extending along its own length direction in the accommodation groove 12. Scale holes 131 are provided at the side ports of each purging hole close to the accommodation groove 12, and the orifices of each scale hole 131 face the material conveying pipe 11, so that the gas passing through the purging hole will form an air flow blowing towards the material conveying pipe 11 along the orifice of the scale hole 131.

[0033] It should be noted that when the scale holes 131 are arranged, it is necessary to ensure that the distance between each scale hole 131 and the notch of the accommodation groove 12 is greater than the maximum stroke of the valve core 2 moving in the accommodation groove 12, so as to ensure that the valve core 2 will not bring the slurry into the area between the scale hole 131 and the side groove wall far from the notch in the accommodation groove 12, and then the slurry in this area cannot be cleaned by the air flow blown out of the scale hole 131.

[0034] See Figure 1 and Figure 2 As shown in FIGS. and, the delay valve 42 is arranged on the purging pipe 41, and the delay valve 42 can be a mechanical delay valve 42, so that the purging assembly 4 is completely composed of mechanical components and does not need to use electronic control equipment during operation, with higher stability. An adjustment knob 421 for adjusting the time required for the gas to pass through the mechanical delay valve 42 is arranged on the mechanical delay valve 42, so that the user can adjust the time required for the gas to pass through the mechanical delay valve 42 through the adjustment knob 421, and this time can be set to 3 - 5 seconds. The one-way valve 43 is arranged on the purging pipe 41 and is located between the delay valve 42 and the purging hole and can prevent the gas in the accommodation groove 12 from passing through the one-way valve 43, so as to ensure that the gas in the accommodation groove 12 will not flow back into the annular gas storage cavity 13 and the purging pipe 41 together with the slurry, thereby ensuring that the annular gas storage cavity 13 will not be blocked by the slurry, and the purging pipe 41 and the equipment on the purging pipe 41 will not be polluted or damaged by the slurry.

[0035] Taking the transported slurry as cement and the time set by the delay valve 42 as 3 seconds as an example, the usage method of a pneumatic conveying valve body automatic purging device provided by the present application is specifically as follows:

[0036] The user can first connect the two ends of the material conveying pipe 11 to the liquid supply pipe for supplying cement and the liquid receiving pipe for receiving cement respectively, and then adjust the air supply state of the air supply device 32 by controlling the reversing valve 31. When the reversing valve 31 allows the air supply device 32 to supply air to the air rod outlet 331, the piston rod of the air cylinder 33 will extend out of the cylinder body and drive the mounting sleeve 21 to extend into the material conveying pipe 11. The compression spring 22 in the mounting sleeve 21 will apply a force to separate the two plugs 23 from each other, so as to be able to abut the two plugs 23 against the inner rings of the two abutting rings 111 respectively, thereby being able to disconnect the cement flow in the material conveying pipe 11 through the cooperation of the two plugs 23 and the two abutting rings 111;

[0037] When the reversing valve 31 allows the air supply device 32 to supply air to the air rod retraction port 332, the piston rod of the air cylinder 33 will retract into the cylinder body and drive the mounting sleeve 21 into the receiving groove 12. At this time, a part of the cement will enter the receiving groove 12 along with the mounting sleeve 21 and the two plugs 23 and adhere to the groove wall of the receiving groove 12. And after 3 seconds, when the mounting sleeve 21 has completely left the material conveying pipe 11, a part of the gas in the pipe between the air rod retraction port 332 and the reversing valve 31 will pass through the purge pipe 41 and the delay valve 42 to reach the annular gas storage cavity 13, and blow towards the cement adhered in the receiving groove 12 from each fish scale hole 131, and then blow these cements back into the material conveying pipe 11 from the gap between the valve core 2 and the groove wall of the receiving groove 12, so as to ensure that these cements will not accumulate in the receiving groove 12 and affect the normal opening of the pneumatic conveying valve.

[0038] The working principle of a pneumatic conveying valve body automatic purging device of the present application during use is specifically as follows:

[0039] The user can first connect the two ends of the feed pipe 11 to the liquid supply pipe for supplying cement and the liquid receiving pipe for receiving cement respectively, and then adjust the air supply state of the air supply device 32 by controlling the reversing valve 31. When the reversing valve 31 allows the air supply device 32 to supply air to the air rod outlet 331, the piston rod of the cylinder 33 will extend out of the cylinder body and drive the mounting sleeve 21 to extend into the feed pipe 11. The compression spring 22 in the mounting sleeve 21 will apply a force to separate the two plugs 23 from each other, so as to be able to abut the two plugs 23 against the inner rings of the two abutting rings 111 respectively, thereby being able to disconnect the cement flow in the feed pipe 11 through the cooperation of the two plugs 23 and the two abutting rings 111; when the reversing valve 31 allows the air supply device 32 to supply air to the air rod retraction port 332, the piston rod of the cylinder 33 will retract into the cylinder body and drive the mounting sleeve 21 into the receiving groove 12. At this time, a part of the cement will enter the receiving groove 12 along with the mounting sleeve 21 and the two plugs 23 and adhere to the groove wall of the receiving groove 12. And after 3 seconds, when the mounting sleeve 21 has completely left the feed pipe 11, a part of the gas in the pipe between the air rod retraction port 332 and the reversing valve 31 will pass through the purging pipe 41 and the delay valve 42 to reach the annular air storage cavity 13, and blow towards the cement adhered in the receiving groove 12 from each fish scale hole 131, and then blow these cements back into the feed pipe 11 from the gap between the valve core 2 and the groove wall of the receiving groove 12, so as to ensure that these cements will not accumulate in the receiving groove 12 and affect the normal opening of the pneumatic conveying valve.

[0040] It should be noted that the above are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An automatic purge device for a pneumatic conveying valve body, characterized in that: It comprises a valve body (1), a valve core (2), a driving assembly (3) and a purge assembly (4); the valve body (1) is provided with a material delivery pipe (11), and the inner wall of the material delivery pipe (11) is provided with a receiving groove (12); The valve core (2) is arranged in the containing groove (12), the driving component (3) is in driving connection with the valve core (2), and the driving component (3) can drive the valve core (2) to approach and block the material conveying pipe (11) or to move away from and open the material conveying pipe (11); The purge assembly (4) is arranged on the inner wall of the containing tank (12) and is capable of blowing the material adhered to the inner wall of the containing tank (12) toward the material conveying pipe (11).

2. The automatic purge device for a pneumatic conveying valve body according to claim 1, characterized in that: The driving assembly (3) comprises a reversing valve (31), an air supply device (32) and a cylinder (33). The reversing valve (31) comprises an air inlet and two air outlets. The air supply device (32) is connected to the air inlet via a pipeline. A connecting hole is provided on the groove wall of the containing groove (12) on the side away from the feeding pipe (11). The piston rod of the cylinder (33) passes through the connecting hole and is connected to the valve core (2). The cylinder body of the cylinder (33) is arranged on the valve body (1), and the cylinder body of the cylinder (33) is provided with an air rod extension port (331) and an air rod retraction port (332). The air rod extension port (331) is connected to one of the two air outlets via a pipeline, and the air rod retraction port (332) is connected to the other of the two air outlets via a pipeline.

3. The automatic purge device for a pneumatic conveying valve body according to claim 2, characterized in that: The purge assembly (4) comprises a purge pipe (41) and a time-delay valve (42). A purge hole leading to the outside of the valve body (1) is provided on the wall of the receiving groove (12). One end of the purge pipe (41) is connected to the purge hole, and the other end of the purge pipe (41) is connected to a pipeline between the gas rod retraction port (332) and the reversing valve (31). The time-delay valve (42) is arranged on the purge pipe (41). When the piston rod of the gas cylinder (33) drives the valve core (2) to retract into the receiving groove (12), the gas in the purge pipe (41) can pass through the time-delay valve (42) and blow the material adhered to the receiving groove (12) from the gap between the valve core (2) and the wall of the receiving groove (12) toward the conveying pipe (11).

4. The automatic purge device for a pneumatic conveying valve body according to claim 3, characterized in that: The purge assembly (4) further comprises a one-way valve (43), wherein the one-way valve (43) is arranged on the purge pipe (41) and is located between the delay valve (42) and the purge hole, and the one-way valve (43) is capable of preventing the gas in the containing tank (12) from passing through the one-way valve (43).

5. The automatic purge device for a pneumatic conveying valve body according to claim 3, characterized in that: The time delay valve (42) is a mechanical time delay valve (42), and the mechanical time delay valve (42) is provided with an adjusting knob (421) for adjusting the time required for gas to pass through the mechanical time delay valve (42).

6. The automatic purge device for a pneumatic conveying valve body according to claim 3, characterized in that: The valve core (2) comprises a mounting sleeve (21), a compression spring (22) and two plugs (23); the mounting sleeve (21) is arranged in the receiving groove (12) along the length direction of the material delivery pipe (11); the sleeve body of the mounting sleeve (21) is connected to the piston rod of the cylinder (33); and there is a gap between the sleeve body of the mounting sleeve (21) and the groove wall of the receiving groove (12); the compression spring (22) is arranged in the mounting sleeve (21) along the length direction of the mounting sleeve (21); two abutment rings (111) are arranged opposite to each other in the material delivery pipe (11); the mounting sleeve (21) is connected to the piston rod of the cylinder (33); and there is a gap between the sleeve body of the mounting sleeve (21) and the groove wall of the receiving groove (12). The mounting sleeve (21) is located between the two abutment rings (111), the outer rings of the abutment rings (111) are connected to the inner wall of the feed pipe (11), the plugs (23) correspond to the abutment rings (111) one by one, each of the plugs (23) is arranged between one end of the mounting sleeve (21) and the corresponding abutment ring (111), and when the mounting sleeve (21) is located in the feed pipe (11), the compression spring (22) can abut each of the plugs (23) against the corresponding abutment ring (111) and seal the inner ring of each abutment ring (111).

7. The automatic purge device for a pneumatic conveying valve body according to claim 3, characterized in that: An annular air storage chamber (13) is provided in the valve body (1) around the central axis of the receiving groove (12) in the length direction, a through hole leading to the outside is provided on the outer cavity wall of the annular air storage chamber (13), and the through hole is connected to the purge pipe (41), and a plurality of purge holes leading to the receiving groove (12) are provided on the inner cavity wall of the annular air storage chamber (13), and each of the purge holes is arranged around the central axis of the receiving groove (12) in the length direction.

8. The automatic purge device for a pneumatic conveying valve body according to claim 7, characterized in that: A fish scale hole (131) is provided on each of the purge holes at a side end close to the containing tank (12), and the opening of each of the fish scale holes (131) faces the material conveying pipe (11).

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