CN222974381U - Automatic purging device for valve body of pneumatic conveying valve - Google Patents

Abstract

The application provides an automatic purging device for a valve body of a pneumatic conveying valve, and relates to the technical field of conveying valves. The automatic feeding device comprises a valve body, a valve core, a driving assembly and a purging assembly, wherein a conveying pipe is arranged on the valve body, a containing groove is formed in the inner wall of the conveying pipe, the valve core is arranged in the containing groove, the driving assembly is in transmission connection with the valve core and can drive the valve core to be close to and block the conveying pipe or be far away from and open the conveying pipe, and the purging assembly is arranged on the inner wall of the containing groove and can blow materials adhered to the inner wall of the containing groove to the conveying pipe. The application has the effect of purging the materials adhered to the inner wall of the accommodating groove, ensuring that the materials are not accumulated in the accommodating groove and influencing the normal opening of the pneumatic conveying valve.

Description

Automatic purging device for valve body of pneumatic conveying valve

Technical Field

The application relates to the technical field of conveying valves, in particular to an automatic purging device for a valve body of a pneumatic conveying valve.

Background

The pneumatic conveying valve is a conveying valve using high-pressure gas as a power source, and is commonly used on a pipeline for conveying slurry such as cement and the like so as to control the on-off of the pipeline by using the pneumatic conveying valve.

The existing pneumatic conveying valve generally comprises a valve body, a valve core and a driving cylinder, wherein a conveying pipe is arranged on the valve body, one side pipe orifice of the conveying pipe is connected with a pipeline for feeding, the other side pipe orifice of the conveying pipe is connected with a pipeline for receiving the material, a containing groove is formed in the inner wall of the conveying pipe, the valve core is arranged in the containing groove, a piston rod of the driving cylinder stretches into the containing groove from a through hole formed in the wall of the containing groove and is connected with the valve core, so that the valve core can be driven by the driving cylinder to be close to or far away from the conveying pipe, and the conveying pipe is plugged by the valve core to enable the pneumatic conveying valve to be closed.

However, as a part of the slurry enters the accommodating groove along with the valve core and adheres to the inner wall of the accommodating groove in each opening and closing process of the pneumatic conveying valve, when more slurry adheres to the inner wall of the accommodating groove, the slurry can prevent the valve core from entering the accommodating groove, and then the normal opening of the pneumatic conveying valve is affected.

In view of the above, it is desirable to provide an automatic purging device for pneumatic conveying valve bodies.

Disclosure of utility model

The application provides an automatic purging device for a valve body of a pneumatic conveying valve, which aims to solve the problem that the normal opening of the pneumatic conveying valve is affected by the fact that more slurry adheres to the valve body after the pneumatic conveying valve is repeatedly used.

The application provides an automatic purging device for a valve body of a pneumatic conveying valve, which adopts the following technical scheme that the automatic purging device comprises a valve body, a valve core, a driving assembly and a purging assembly, wherein a conveying pipe is arranged on the valve body, and an accommodating groove is formed in the inner wall of the conveying pipe;

The valve core is arranged in the accommodating groove, the driving assembly is in transmission connection with the valve core, and the driving assembly can drive the valve core to be close to and block the conveying pipe or be far away from and open the conveying pipe;

The purging component is arranged on the inner wall of the accommodating groove and can blow materials adhered on the inner wall of the accommodating groove to the conveying pipe.

Through the technical scheme, after the two ends of the conveying pipe are respectively connected with the liquid supply pipeline for supplying slurry and the liquid receiving pipeline for receiving slurry, a user can drive the valve core to be close to or far away from the conveying pipe through the driving component to control the on-off of the slurry flow in the conveying pipe, when the valve core leaves and enters the accommodating groove each time, a part of slurry can enter the accommodating groove along with the valve core and is adhered to the inner wall of the accommodating groove, and the purging component can blow the slurry adhered to the inner wall of the accommodating groove back into the conveying pipe so as to ensure that the slurry can not be accumulated in the accommodating groove and influence the normal opening of the pneumatic conveying valve.

Specifically, drive assembly includes switching-over valve, air supply unit and cylinder, the switching-over valve includes air inlet and two gas outlets, air supply unit pass through the pipeline with the air inlet is connected, keep away from on the holding tank one side cell wall of conveying pipeline has seted up the intercommunicating pore, the piston rod of cylinder passes the intercommunicating pore with the case is connected, the cylinder body of cylinder is located on the valve body, and be equipped with gas pole extension port and gas pole withdrawal port on the cylinder body of this cylinder, the gas pole extension port passes through the pipeline and is connected with two one of the gas outlets, the gas pole withdrawal port passes through the pipeline and is connected with two another of the gas outlets.

Through adopting above-mentioned technical scheme, the user can adjust air feed device's air feed state through the switching-over valve to can allow air feed device to the gas pole to stretch out the outlet air feed and drive the piston rod of cylinder and stretch out the cylinder body and drive case shutoff conveying pipeline through the control switching-over valve, perhaps control switching-over valve allows air feed device to the gas pole to withdraw the outlet air feed and drive the piston rod of cylinder and withdraw the cylinder body and drive the case and keep away from and open the conveying pipeline.

Further, the purge assembly comprises a purge pipe and a delay valve, wherein a purge hole leading to the outside of the valve body is formed in the groove wall of the accommodating groove, one end of the purge pipe is connected with the purge hole, the other end of the purge pipe is connected to a pipeline between the air rod retraction port and the reversing valve, the delay valve is arranged on the purge pipe, when the piston rod of the air cylinder drives the valve core to retract into the accommodating groove, gas in the purge pipe can pass through the delay valve, and materials adhered in the accommodating groove are blown to the conveying pipe from a gap between the valve core and the groove wall of the accommodating groove.

Through adopting above-mentioned technical scheme, when the switching-over valve allows air feeder to the gas pole to withdraw the mouth air feed, air feeder also can be simultaneously to the purge pipe in the air feed, and the setting of time delay valve can delay the time that the gas in the purge pipe reached purge hole department to when the piston rod of cylinder drove the case and withdraw to the holding tank, the gas in the purge pipe just can pass the time delay valve and reach the purge hole, and blows the thick liquid of holding tank internal adhesion to the conveying pipeline from the clearance department between the cell wall of case and holding tank.

Further, the purging assembly further comprises a one-way valve, the one-way valve is arranged on the purging pipe and located between the time delay valve and the purging hole, and the one-way valve can prevent gas in the accommodating groove from passing through the one-way valve.

Through adopting above-mentioned technical scheme, the check valve can prevent the gaseous check valve that passes in the holding tank to guarantee that the gaseous check valve that can not take thick liquid back flow in the same time in the purge pipe in the holding tank, thereby can guarantee that purge pipe and the equipment on the purge pipe can not be polluted, spoiled by thick liquid.

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

By adopting the technical scheme, a user can adjust the time required for passing through the mechanical time delay valve through the adjusting knob.

Further, the case includes installation cover, pressure spring and two plugs, the installation cover is followed the length direction of conveying pipeline is located in the holding tank, the cover body of installation cover with the piston rod of cylinder is connected, just there is the clearance between the cover body of installation cover and the cell wall of holding tank, the pressure spring is followed the length direction of installation cover is located in this installation cover, be provided with two butt rings in the conveying pipeline relatively, the installation cover is located two between the butt ring, each the outer loop of butt ring all with the inner wall connection of conveying pipeline, the plug with the butt ring one-to-one, every the plug is located one end port of installation cover with between the butt ring that corresponds, works as the installation cover is located in the conveying pipeline, the pressure spring can with every the plug butt is in the butt is on the butt ring that corresponds and each the inner ring of butt ring is blocked.

According to the technical scheme, when the installation sleeve is positioned in the conveying pipe, the pressure spring in the installation sleeve can apply a force away from each other to the two plugs so as to enable the two plugs to be respectively abutted against the inner rings of the two abutting rings, so that the slurry flow in the conveying pipe can be disconnected through the cooperation of the two plugs and the two abutting rings, and when the installation sleeve leaves the conveying pipe and enters the containing groove, the slurry blown to the conveying pipe from the containing groove by the air flow can pass through a gap between the sleeve body of the installation sleeve and the groove wall of the containing groove.

Further, an annular air storage cavity is formed in the valve body around the central axis of the accommodating 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 is connected with the purging pipe, a plurality of purging holes leading to the accommodating groove are formed in the inner cavity wall of the annular air storage cavity, and each purging hole is arranged around the central axis of the accommodating groove in the length direction.

Through adopting above-mentioned technical scheme, the gas in the purge pipe can get into the annular gas storage chamber earlier in, equally divide again to each purge hole in, and encircle the purge hole that the holding tank set up at the ascending axis of length can purge the thick liquid on each cell wall that self length direction extends in the holding tank to can increase the purge efficiency of purge the subassembly to the thick liquid in the holding tank.

Further, a fish scale hole is formed in a port of one side, close to the accommodating groove, of each purge hole, and the orifice of each fish scale hole faces the conveying pipe.

By adopting the technical scheme, the air passing through the blowing holes can form air flows blowing to the conveying pipe along the openings of the fish scale holes, so that the blowing capacity of the air flows to the slurry in the accommodating groove can be improved.

In summary, the application has the following beneficial technical effects:

The automatic feeding device comprises a valve body, a valve core, a driving assembly and a purging assembly, wherein a conveying pipe is arranged on the valve body, a containing groove is formed in the inner wall of the conveying pipe, the valve core is arranged in the containing groove and is in transmission connection with the valve core, the driving assembly can drive the valve core to approach and block the conveying pipe or keep away from and open the conveying pipe, the purging assembly is arranged on the inner wall of the containing groove and can blow materials adhered to the inner wall of the containing groove to the conveying pipe, after two ends of the conveying pipe are respectively connected with a liquid supply pipeline for supplying slurry and a liquid receiving pipeline for receiving the slurry, a user can drive the valve core to approach or keep away from the conveying pipe through the driving assembly to control on-off of slurry flow in the conveying pipe, and in the process that the valve core leaves and enters the containing groove each time, a part of slurry can enter the containing groove and adhere to the inner wall of the containing groove, and the purging assembly can blow the slurry adhered to the inner wall of the containing groove back to the conveying pipe so as to ensure that the slurry cannot be accumulated in the containing groove and influence normal opening of a pneumatic conveying valve.

Drawings

FIG. 1 is a perspective view of an automatic purging device for a pneumatic conveying valve body of the present application;

Fig. 2 is a schematic cross-sectional view taken along the direction A-A in fig. 1.

Reference numeral 1, valve body; 11, a material conveying pipe, 111, an abutting ring, 12, a containing groove, 13, an annular gas storage cavity, 131, a fish scale hole, 2, a valve core, 21, a mounting sleeve, 22, a pressure spring, 23, a plug, 3, a driving component, 31, a reversing valve, 32, a gas supply device, 33, a cylinder, 331, a gas rod extending outlet, 332, a gas rod retracting opening, 4, a purging component, 41, a purging pipe, 42, a delay valve, 421, an adjusting knob, 43 and a one-way valve.

Detailed Description

Fig. 1 is a perspective view of an automatic purging device for a valve body of a pneumatic conveying valve according to the present application, and fig. 2 is a schematic cross-sectional view taken along the direction A-A in fig. 1. Referring to fig. 1 and 2, the automatic purging device for the valve body of the pneumatic conveying valve provided by the application comprises a valve body 1, a valve core 2, a driving assembly 3 and a purging assembly 4, wherein a conveying pipe 11 is arranged on the valve body 1, a containing groove 12 is formed in the inner wall of the conveying pipe 11, a pair of abutting rings 111 are further arranged in the conveying pipe 11, the notch of the containing groove 12 is positioned between the abutting rings 111, the central axis of each abutting ring 111 is overlapped with the central axis of the conveying pipe 11, the two abutting rings 111 can be made of rubber, the valve core 2 comprises a mounting sleeve 21, a pressure spring 22 and two plugs 23, the mounting sleeve 21 is arranged in the containing groove 12 along the length direction of the conveying pipe 11, a gap exists between the sleeve body of the mounting sleeve 21 and the groove wall of the containing groove 12, the pressure spring 22 is arranged in the mounting sleeve 21 along the length direction of the mounting sleeve 21, the plugs 23 are in one-to-one correspondence with the abutting rings 111, and each plug 23 is arranged between one end port of the mounting sleeve 21 and the corresponding abutting ring 111.

Referring to fig. 1 and 2, the driving assembly 3 includes a reversing valve 31, an air supply device 32 and an air cylinder 33, the reversing valve 31 includes an air inlet and two air outlets, the air supply device 32 is connected with the air inlet through a pipeline, a communication hole is formed on a groove wall of one side of the containing groove 12 far away from the conveying pipe 11, a piston rod of the air cylinder 33 passes through the communication hole to be connected with the valve core 2, a cylinder body of the air cylinder 33 is arranged on the valve body 1, an air rod extending opening 331 and an air rod retracting opening 332 are formed on the cylinder body of the air cylinder 33, the air rod extending opening 331 is connected with one of the two air outlets through a pipeline, the air rod retracting opening 332 is connected with the other one of the two air outlets through a pipeline, the reversing valve 31 can be an electromagnetic reversing valve, so that a user can adjust the air supply state of the air supply device 32 through the reversing valve 31, the piston rod extending of the air cylinder 33 can be driven through controlling the reversing valve 31 to allow the air supply device 32 to enter into the conveying pipe 11, the mounting sleeve 21 is driven to enter into the mounting sleeve 11 through the piston rod, the mounting sleeve 23 is driven by the piston rod, the pressure spring 22 in the mounting sleeve 21 is driven to apply a force far from each other to the two plugs 23 respectively to the two air cylinders 23 through the mounting sleeve 21, the two air cylinders are driven to be respectively in a state far away from each other to the inner ring 111, and the air inlet can be driven into the state by driving the air cylinder 32 through the control sleeve 21 is driven to be in a state far away from the air by the air, and the air valve is in a state, and the state is in contact with the two air is in a state, and the two is in each air.

Referring to fig. 1 and 2, the purging component 4 comprises a purging pipe 41, a mechanical delay valve 42 and a one-way valve 43, wherein an annular gas storage cavity 13 is formed in the valve body 1 around the central axis of the accommodating groove 12 in the length direction, a through hole leading to the outside is formed in the outer cavity wall of the annular gas storage cavity 13, the through hole is connected with one end of the purging pipe 41, the other end of the purging pipe 41 is connected to a pipeline between the gas rod retracting port 332 and the reversing valve 31, a plurality of purging holes leading to the accommodating groove 12 are formed in the inner cavity wall of the annular gas storage cavity 13, the purging holes are uniformly arranged around the central axis of the accommodating groove 12 in the length direction, so that gas in the purging pipe 41 can firstly enter the annular gas storage cavity 13 and then uniformly distributed to each purging hole, the purging holes arranged around the central axis of the accommodating groove 12 in the length direction can purge each groove wall extending in the accommodating groove 12 in the length direction, the port of one side of each purging hole, which is close to the accommodating groove 12, the ports 131 of each scale hole face the pipeline 11, and the scale hole 131 are formed in the direction along the port of the scale hole, so that the gas passing through the purging holes can form the blowing pipeline 11.

It should be noted that, when the above-mentioned fish scale holes 131 are set, it is required to ensure that the distance between each fish scale hole 131 and the notch of the accommodating groove 12 is larger than the maximum travel of the valve core 2 moving in the accommodating groove 12, so as to ensure that the valve core 2 will not bring the slurry into the area between the fish scale hole 131 and the groove wall of the accommodating groove 12 on the side far away from the notch, and then the slurry in the area cannot be cleaned by the air flow blown out from the fish scale hole 131.

Referring to fig. 1 and 2, the delay valve 42 is arranged on the purge tube 41, the delay valve 42 can be a mechanical delay valve 42, so that the purge assembly 4 is completely composed of mechanical parts, an electric control device is not needed in operation, stability is higher, an adjusting knob 421 for adjusting time required for gas to pass through the mechanical delay valve 42 is arranged on the mechanical delay valve 42, so that a user can adjust time required for passing through the mechanical delay valve 42 through the adjusting knob 421, the time can be set to be 3-5 seconds, a one-way valve 43 is arranged on the purge tube 41 and between the delay valve 42 and the purge hole, and can prevent the gas in the accommodating groove 12 from passing through the one-way valve 43, so that the gas in the accommodating groove 12 can be guaranteed not to flow back into the annular gas storage cavity 13 and the purge tube 41 together with slurry through the one-way valve 43, and the annular gas storage cavity 13 can be guaranteed not to be blocked by slurry, and the purge tube 41 and devices on the purge tube 41 can not be polluted and damaged by slurry.

Taking the transported slurry as cement and the time set by the time delay valve 42 as an example, the automatic purging device for the valve body of the pneumatic conveying valve provided by the application is used in the following specific manner:

The user can connect the two ends of the conveying pipe 11 with a liquid supply pipe for supplying cement and a liquid receiving pipe for receiving cement respectively, then control the reversing valve 31 to adjust the air supply state of the air supply device 32, when the reversing valve 31 allows the air supply device 32 to supply air to the air rod extending outlet 331, the piston rod of the air cylinder 33 extends out of the cylinder body and drives the mounting sleeve 21 to extend into the conveying pipe 11, the pressure spring 22 in the mounting sleeve 21 can apply a force away from each other to the two plugs 23 so as to respectively abut the two plugs 23 on the inner rings of the two abutting rings 111, and thus the cement flow in the conveying pipe 11 can be disconnected 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 opening 332, the piston rod of the air cylinder 33 can retract into the cylinder body and drive the mounting sleeve 21 to enter the accommodating groove 12, at the moment, a part of cement can enter the accommodating groove 12 along with the mounting sleeve 21 and the two plugs 23 and adhere to the groove wall of the accommodating groove 12, and after 3 seconds, when the mounting sleeve 21 completely leaves the conveying pipe 11, a part of air in the pipeline between the air rod retraction opening 332 and the reversing valve 31 can pass through the purging pipe 41 and the delay valve 42 to reach the annular air storage cavity 13 and blow the cement adhered to the accommodating groove 12 from the positions of the scale holes 131, and then blow the cement back into the conveying pipe 11 from the gap between the valve core 2 and the groove wall of the accommodating groove 12, so that the cement can be ensured not to be accumulated in the accommodating groove 12 and influence the normal opening of the pneumatic conveying valve.

The application relates to an automatic purging device for a valve body of a pneumatic conveying valve, which specifically comprises the following working principles:

The two ends of the conveying pipe 11 can be connected with a cement supplying pipeline and a cement receiving pipeline respectively by a user, the air supplying state of the air supplying device 32 is adjusted by controlling the reversing valve 31, when the reversing valve 31 allows the air supplying device 32 to supply air to the air rod extending outlet 331, a piston rod of the air cylinder 33 extends out of the cylinder body and drives the mounting sleeve 21 to extend into the conveying pipe 11, the pressure spring 22 in the mounting sleeve 21 can apply a force away from each other to the two plugs 23, so that the two plugs 23 can be respectively abutted against the inner rings of the two abutting rings 111, and thus the cement flow in the conveying pipe 11 can be disconnected through the cooperation of the two plugs 23 and the two abutting rings 111, when the reversing valve 31 allows the air supplying device 32 to supply air to the air rod retracting opening 332, the piston rod of the air cylinder 33 can retract into the cylinder body and drive the mounting sleeve 21 to enter into the accommodating groove 12, at the moment, a part of cement can enter into the accommodating groove 12 along with the mounting sleeve 21 and the two plugs 23 and adhere to the groove wall of the accommodating groove 12, after 3 seconds, the mounting sleeve 21 can completely leave the conveying pipe 11, the two plugs 23 can completely leave the inner rings of the conveying pipe 11, the cement can not reach the air cavity 12 from the air inlet hole 12 and then be blown into the air cavity 12 from the annular groove 12, and the gap between the sealing valve 31 and the air valve 13 can be opened, and the air valve can not be blown into the air cavity 12, and the gap can be normally influenced by the cement hole can be blown into the gap between the air hole 12 and the sealing valve 12, and the air hole 11.

It should be noted that the above embodiments are not intended to limit the scope of the present application, so that the equivalent changes according to the structure, shape and principle of the present application should be covered.

Claims (8)

1. The automatic purging device for the valve body of the pneumatic conveying valve is characterized by comprising a valve body (1), a valve core (2), a driving assembly (3) and a purging assembly (4), wherein a conveying pipe (11) is arranged on the valve body (1), and an accommodating groove (12) is formed in the inner wall of the conveying pipe (11);

The valve core (2) is arranged in the accommodating groove (12), the driving assembly (3) is in transmission connection with the valve core (2), and the driving assembly (3) can drive the valve core (2) to be close to and block the conveying pipe (11) or to be far away from and open the conveying pipe (11);

The purging component (4) is arranged on the inner wall of the accommodating groove (12) and can blow materials adhered on the inner wall of the accommodating groove (12) to the conveying pipe (11).

2. A valve body automatic purging device for a pneumatic conveying valve is characterized in that the driving assembly (3) comprises a reversing valve (31), an air supply device (32) and an air cylinder (33), the reversing valve (31) comprises an air inlet and two air outlets, the air supply device (32) is connected with the air inlet through a pipeline, a communication hole is formed in a groove wall of one side, far away from the conveying pipeline (11), of the accommodating groove (12), a piston rod of the air cylinder (33) penetrates through the communication hole to be connected with the valve core (2), a cylinder body of the air cylinder (33) is arranged on the valve body (1), an air rod extending opening (331) and an air rod retracting opening (332) are formed in the cylinder body of the air cylinder (33), the air rod extending opening (331) is connected with one of the two air outlets through a pipeline, and the air rod retracting opening (332) is connected with the other of the two air outlets through a pipeline.

3. An automatic purging device for a valve body of a pneumatic conveying valve according to claim 2, wherein the purging component (4) comprises a purging pipe (41) and a delay valve (42), a purging hole leading to the outside of the valve body (1) is formed in the groove wall of the accommodating groove (12), one end of the purging pipe (41) is connected with the purging hole, the other end of the purging pipe (41) is connected to a pipeline between the gas rod retracting opening (332) and the reversing valve (31), the delay valve (42) is arranged on the purging pipe (41), and when a piston rod of the cylinder (33) drives the valve core (2) to retract into the accommodating groove (12), gas in the purging pipe (41) can pass through the delay valve (42) and materials adhered in the accommodating groove (12) can be blown to the conveying pipeline (11) from a gap between the valve core (2) and the groove wall of the accommodating groove (12).

4. A pneumatic conveying valve body automatic purging device as claimed in claim 3, wherein the purging assembly (4) further comprises a one-way valve (43), the one-way valve (43) is arranged on the purging pipe (41) and is positioned between the delay valve (42) and the purging hole, and the one-way valve (43) can prevent gas in the accommodating groove (12) from passing through the one-way valve (43).

5. An automatic purging device for a valve body of a pneumatic conveying valve as claimed in claim 3, wherein the delay valve (42) is a mechanical delay valve (42), and an adjusting 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).

6. An automatic purging device for a valve body of a pneumatic conveying valve according to claim 3, wherein the valve core (2) comprises a mounting sleeve (21), a pressure spring (22) and two plugs (23), the mounting sleeve (21) is arranged in the accommodating groove (12) along the length direction of the conveying pipe (11), a sleeve body of the mounting sleeve (21) is connected with a piston rod of the air cylinder (33), a gap exists between the sleeve body of the mounting sleeve (21) and the groove wall of the accommodating groove (12), the pressure spring (22) is arranged in the mounting sleeve (21) along the length direction of the mounting sleeve (21), two abutting rings (111) are arranged in the conveying pipe (11), the mounting sleeve (21) is arranged between the two abutting rings (111), an outer ring of each abutting ring (111) is connected with the inner wall of the conveying pipe (11), the plugs (23) are in one-to-one correspondence, each abutting ring (23) is arranged between the corresponding mounting sleeve (21) and one end of the corresponding abutting ring (111) when the mounting sleeve (21) is arranged in the conveying pipe (11), the compression spring (22) can enable each plug (23) to be abutted against the corresponding abutting ring (111) and seal the inner ring of each abutting ring (111).

7. A pneumatic conveying valve body automatic purging device is characterized in that an annular air storage cavity (13) is formed in the valve body (1) around the central axis of the accommodating groove (12) in the length direction, a through hole leading to the outside is formed in the outer cavity wall of the annular air storage cavity (13), the through hole is connected with the purging pipe (41), a plurality of purging holes leading to the accommodating groove (12) are formed in the inner cavity wall of the annular air storage cavity (13), and each purging hole is arranged around the central axis of the accommodating groove (12) in the length direction.

8. A pneumatic conveying valve body automatic purging device as claimed in claim 7, wherein a scale hole (131) is formed in a port of one side of each purging hole, which is close to the accommodating groove (12), and the orifice of each scale hole (131) faces the conveying pipe (11).