CN111169825A - Blockage clearing and flow assisting device for air cannon - Google Patents

Blockage clearing and flow assisting device for air cannon Download PDF

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Publication number
CN111169825A
CN111169825A CN202010097428.8A CN202010097428A CN111169825A CN 111169825 A CN111169825 A CN 111169825A CN 202010097428 A CN202010097428 A CN 202010097428A CN 111169825 A CN111169825 A CN 111169825A
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Prior art keywords
air
cavity
way
electromagnetic valve
storage tank
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陈荣斌
陈立龙
陈卫平
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Zhejiang Hanghui Valve Co ltd
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Zhejiang Hanghui Valve Co ltd
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Priority to CN202010097428.8A priority Critical patent/CN111169825A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
    • B65D88/70—Large containers characterised by means facilitating filling or emptying preventing bridge formation using fluid jets
    • B65D88/703—Air blowing devices, i.e. devices for the sudden introduction of compressed air into the container

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  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The application discloses a blockage removing and flow assisting device for an air cannon, which comprises an air storage tank, a three-way device and a three-way electromagnetic valve; the gas storage tank is used for storing compressed gas; the three-way device is used for jetting an air cannon into a storage bin for storing materials, the left end and the right end of the three-way device are provided with openings for being respectively connected with the air storage tank and the three-way electromagnetic valve, and one end of the three-way device is provided with an opening for being connected with the storage bin; the three-way electromagnetic valve is used for opening and closing the three-way device and the air storage tank, one end opening is used for being connected with the three-way device and conveying air, one end opening is used for reversing exhaust, and the other end opening is used for allowing air to enter the three-way electromagnetic valve. According to the method, the air cannon is applied to the storage bin to perform blockage clearing operation, so that the labor intensity is obviously reduced, and the labor productivity is improved; the air flow speed is controlled to be higher than the sound speed, so that the device has the characteristics of high impact force and high efficiency; has the effects of convenient use, safety, time saving and energy saving.

Description

Blockage clearing and flow assisting device for air cannon
Technical Field
The application relates to the technical field of blockage clearing devices, in particular to a blockage clearing and flow assisting device for an air cannon.
Background
In industries such as power generation, steel, metallurgy, chemical industry, wine making, cement and the like, materials must be continuously conveyed through a storage bin to realize final continuous production. However, due to moisture, extrusion or friction with the silo, the material often remains in the silo, arches and blocks. In order to improve the fluidity of the materials in the silo, safely and energy-saving, rapidly remove the defects of arching, blocking, sticking and the like of the silo, and keep the continuity of the production process, the prior mode usually adopts manual striking for dredging, and the problems of time and labor waste and low safety are caused when manual striking for dredging is carried out. When the mechanical method is used for treatment, the problems of low efficiency and low blockage removal quality are also solved and need to be improved.
Disclosure of Invention
In view of this, the present application aims to provide an air cannon blockage-clearing flow-aiding device, so as to achieve the purpose of stable and continuous production of materials. The specific scheme is as follows:
a blockage-removing and flow-assisting device for an air cannon comprises an air storage tank, a three-way device and a three-way electromagnetic valve;
the gas storage tank is used for storing compressed gas;
the three-way device is used for jetting an air cannon into a storage bin for storing materials, the left end and the right end of the three-way device are provided with openings for being respectively connected with the air storage tank and the three-way electromagnetic valve, and one end of the three-way device is provided with an opening for being connected with the storage bin;
the three-way electromagnetic valve is used for opening and closing the three-way device and the air storage tank, one end opening is used for being connected with the three-way device and conveying air, one end opening is used for reversing exhaust, and the other end opening is used for allowing air to enter the three-way electromagnetic valve.
Preferably, the air filtering pressure reducer, the one-way valve and the ball valve are sequentially connected with the three-way electromagnetic valve, and the ball valve is used for controlling air to enter the air filtering pressure reducer through the one-way valve.
Preferably, the three-way electromagnetic valve is a two-position three-way electromagnetic valve.
Preferably, the three-way device comprises a device cylinder body and an air flushing device, wherein two ends of the device cylinder body are respectively connected with the air storage tank and the two-position three-way electromagnetic valve, the air flushing device is used for being connected with the storage bin, the inner diameter of one end, connected with the air storage tank, of the device cylinder body is larger than that of the other end of the device cylinder body, the air flushing device is fixed at one end, connected with the two-position three-way electromagnetic valve, of the device cylinder body, a main valve flap is inserted into one end, connected with the air storage tank, of the device cylinder body, the two-position three-way electromagnetic valve drives the main valve flap to.
Preferably, an auxiliary spring and an auxiliary valve clack which are sequentially connected are arranged between the valve seat and the main valve clack, and a main spring is arranged between the main valve clack and the inner side of one end, connected with the two-position three-way electromagnetic valve, of the device cylinder body.
Preferably, the method of operation of the apparatus comprises the steps of:
step 1, inputting air into a device cylinder through a two-position three-way electromagnetic valve, forming a cavity B and a cavity A which are positioned at the left end and the right end of a main valve in the device cylinder of the three-way device and a cavity C in an air flushing device, wherein the cavity B is communicated with an air storage tank, the air pressure in the cavity A and the cavity B is equal, and the cavity C is connected and closed with the cavity B;
step 2, controlling the two-position three-way electromagnetic valve to change the position, so that air in the cavity A is exhausted in a reversing way through an opening at one end of the two-position three-way electromagnetic valve;
step 3, the air pressure in the cavity A is reduced and is smaller than the air pressure in the cavity B, the auxiliary spring moves towards one end of the main spring and quickly pushes the main valve flap to move towards one end of the cavity A, and the cavity C is communicated with the cavity B;
step 4, spraying an air cannon into a bin connected with the air blast device by compressed air of the air storage tank through the cavity B and the cavity C, and clearing the bin;
and 5, controlling the two-position three-way electromagnetic valve to change the position, enabling the gas to enter the cavity A through the two-position three-way electromagnetic valve, and controlling the gas pressure in the cavity A to be equal to that in the cavity B.
Preferably, in step 1, a preload Q is formed between the main valve flap and the main springyAnd the main valve flap is subjected to a medium force QJA sealing force Q is formed between the main valve flap and the gas storage tankm；
Qy＝Pj·π/4(d0+bM)2；
Wherein Q isyFor pre-tensioning the spring (N))，PJTo design the pressure (MPa), d0Is the inner diameter (mm) of the valve seat, bMSealing surface width (mm);
QJ＝P·π/4(d0+bM)2；
wherein Q isJThe medium force (N) borne by the main valve is adopted, and P is the working pressure (MPa) of the air storage tank;
Qm＝Qy-QJ＝(Pj-P)·π/4(d0+bM)2；
wherein Q ismIs the sealing force (N);
and QmGreater than 0.
Preferably, the method further comprises the following sealing checking steps:
s1, performing allowable specific pressure check according to the working condition without medium, namely:
Figure BDA0002385587390000031
wherein q isMFTo seal the specific pressure, qMFAccording to different material experiments of the sealing surface;
and S2, performing necessary pressure comparison check at the working pressure, namely:
Figure BDA0002385587390000032
wherein [ q ] is the necessary specific pressure, [ q ] is determined according to different material experiments of the sealing surface.
Preferably, the stiffness of the primary spring and the secondary spring are both λ, and:
λ＝1/h(Pj-P)·π/4(d0+bM)2；
wherein, lambda is the rigidity value (N/mm), and h is the maximum height (mm) of the main valve flap.
Preferably, in step 4, the impact force of the air cannon is F, and:
F＝G2·C2；
G2＝AC2/v2；
v2＝RT2/P2；
Figure BDA0002385587390000033
wherein F is the impact force (N), G2Is the mass flow (Kg/s) in the air-blast device, and A is the cross-sectional area (m) of the air-blast device2)，v2Is the specific volume (m) of air in the air-blast device3/Kg), R is a gas state constant and R is 0.287 KJ/Kg.K, CpIs gas with constant pressure and specific heat capacity and is air Cp＝1004KJ/Kg·K；
P1、T1And C1Respectively the air pressure (MPa), temperature (K) and flow velocity (m/s), C1＝0；
P2、T2And C2Respectively the air pressure (MPa), temperature (K) and flow velocity (m/s) when the air-blast device releases air
According to the scheme, the application provides a clear stifled class device that helps of air bubble, and this clear stifled class device that helps of air bubble has following beneficial effect:
1. the air cannon is applied to the storage bin through the air cannon blockage cleaning and flow assisting device for carrying out blockage cleaning operation, so that the labor intensity is obviously reduced, and the labor productivity is improved;
2. the air flow speed is controlled to be higher than the sound speed, so that the device has the characteristics of high impact force and high efficiency;
3. the blockage removing and flow assisting device for the air cannon is remotely controlled, and has the effects of convenience in use, safety, time saving and energy saving.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural view of an air cannon blockage removal flow aid disclosed by the application;
fig. 2 is a schematic cross-sectional structure view of an air impingement device disclosed herein.
Description of reference numerals: 1. a gas storage tank; 11. a device barrel; 12. a valve seat; 13. a main valve flap; 14. an auxiliary valve flap; 15. a secondary spring; 16. a main spring; 2. an air blast device; 3. a wire joint; 4. a two-position three-way electromagnetic valve; 5. an air filtration pressure reducer; 6. a one-way valve; 7. a ball valve.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, the air cannon blockage-clearing flow-assisting device comprises an air storage tank, a three-way device and a two-position three-way electromagnetic valve which are sequentially connected. The gas storage tank is used for storing compressed gas; the three-way device is used for jetting an air cannon into a bin for storing materials, the left end and the right end of the three-way device are respectively connected with the air storage tank and the two-position three-way electromagnetic valve, and the opening at one end of the three-way device is connected with the bin; meanwhile, the three-way electromagnetic valve is used for opening and closing the three-way device and the air storage tank, one end opening of the two-position three-way electromagnetic valve is used for being connected with the three-way device and conveying air, one end opening of the two-position three-way electromagnetic valve is used for reversing and exhausting air, and the last end opening of the two-position three-way electromagnetic valve is used for enabling air to enter. The two-position three-way electromagnetic valve is also sequentially connected with an air filtering pressure reducer, a one-way valve and a ball valve. The ball valve is used for controlling air to enter the air filtering pressure reducer through the one-way valve.
As shown in fig. 1 and 2, the three-way device includes a device cylinder body and an air-blast device, wherein two ends of the device cylinder body are respectively connected with the air storage tank and the two-position three-way electromagnetic valve, and the air-blast device is used for being connected with the storage bin. The inner diameter of one end of the device cylinder body connected with the gas storage tank is larger than that of the other end of the device cylinder body connected with the gas storage tank, and the gas flushing device is fixed at one end of the device cylinder body connected with the gas storage tank. The main valve flap is inserted at one end of the device cylinder body connected with the two-position three-way electromagnetic valve, and the valve seat inserted into the device cylinder body is connected on the gas storage tank. The two-position three-way electromagnetic valve drives the main valve flap to move left and right and controls the opening and closing of the two-position three-way device and the air storage tank, so that the effect of controlling the air cannon to be sprayed into a storage bin for storing materials to achieve the purpose of clearing blockage is achieved. It should be noted that an auxiliary spring and an auxiliary valve clack which are connected in sequence are arranged between the valve seat and the main valve clack. A main spring is arranged between the main valve flap and the inner side of one end of the device cylinder body connected with the two-position three-way electromagnetic valve. The stiffness of the primary and secondary springs is λ, and:
λ＝1/h(Pj-P)·π/4(d0+bM)2；
wherein, lambda is the rigidity value (N/mm), and h is the maximum height (mm) of the main valve flap.
As shown in fig. 2, the operation method of the apparatus includes the steps of:
step 1, inputting air into a device cylinder through a two-position three-way electromagnetic valve, forming a cavity B and a cavity A which are positioned at the left end and the right end of a main valve in the device cylinder of the three-way device and a cavity C in an air flushing device, wherein the cavity B is communicated with an air storage tank, the air pressure in the cavity A and the cavity B is equal, the cavity C is connected and closed with the cavity B, and pretightening force Q is formed between the main valve and a main springyAnd the main valve flap is subjected to a medium force QJA sealing force Q is formed between the main valve flap and the gas storage tankm；
Qy＝Pj·π/4(d0+bM)2；
Wherein Q isyFor spring pre-tightening (N), PJTo design the pressure (MPa), d0Is the inner diameter (mm) of the valve seat, bMSealing surface width (mm);
QJ＝P·π/4(d0+bM)2；
wherein Q isJThe medium force (N) borne by the main valve is adopted, and P is the working pressure (MPa) of the air storage tank;
Qm＝Qy-QJ＝(Pj-P)·π/4(d0+bM)2；
wherein Q ismIs the sealing force (N);
and QmGreater than 0;
step 2, seal checking, comprising the following steps:
s1, performing allowable specific pressure check according to the working condition without medium, namely:
Figure BDA0002385587390000061
wherein q isMFTo seal the specific pressure, qMFAccording to different material experiments of the sealing surface;
if the allowable ratio pressure check is established, continuing to S2, otherwise, continuing to step 1;
and S2, performing necessary pressure comparison check at the working pressure, namely:
Figure BDA0002385587390000062
wherein [ q ] is the necessary specific pressure, [ q ] is determined according to different material experiments of the sealing surface;
if the comparison and pressure check is required to be established, continuing to step 3, otherwise, continuing to step 1;
step 3, controlling the two-position three-way electromagnetic valve to change the position, so that the air in the cavity A is exhausted in a reversing way through an opening at one end of the two-position three-way electromagnetic valve;
step 4, the air pressure in the cavity A is reduced and is smaller than the air pressure in the cavity B, the auxiliary spring moves towards one end of the main spring and quickly pushes the main valve flap to move towards one end of the cavity A, and the cavity C is communicated with the cavity B;
step 5, the compressed gas of the gas storage tank passes through the cavity B and the cavity C, and sprays an air cannon into a stock bin connected with the air blasting device, and the stock bin is subjected to blockage clearing operation, wherein the impact force of the air cannon is F, and:
F＝G2·C2；
G2＝AC2/v2；
V2＝RT2/P2；
Figure BDA0002385587390000071
wherein F is the impact force (N), G2Is the mass flow (Kg/s) in the air-blast device, and A is the cross-sectional area (m) of the air-blast device2)，v2Is the specific volume (m) of air in the air-blast device3/Kg), R is a gas state constant and R is 0.287 KJ/Kg.K, CpIs gas with constant pressure and specific heat capacity and is air Cp＝1004KJ/Kg·K；
P1、T1And C1Respectively the air pressure (MPa), temperature (K) and flow velocity (m/s), C1＝0；
P2、T2And C2Respectively the air pressure (MPa), the temperature (K) and the flow velocity (m/s) when the air impact device releases air;
and 6, controlling the two-position three-way electromagnetic valve to change the position, enabling the gas to enter the cavity A through the two-position three-way electromagnetic valve, and controlling the gas pressure in the cavity A to be equal to that in the cavity B.
It should be noted that the stiffness of the main spring and the secondary spring is λ, and:
λ=1/h(Pj-P)·π/4(d0+bM)2；
wherein, lambda is the rigidity value (N/mm), and h is the maximum height (mm) of the main valve flap.
At P20.25MPa, T1Is 300K, d0At 0.1 m; separately control P1Four of the following examples were carried out at 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa and were obtained:
TABLE 1 results of calculation
Figure BDA0002385587390000072
Figure BDA0002385587390000081
And in control of P1Respectively at 0.6MPa,The detection is carried out at 0.7MPa, 0.8MPa and 0.9MPa, and four detection results are obtained as follows:
TABLE 2 test results
Figure BDA0002385587390000082
In conclusion, the calculation result is closer to the detection result, the control and output of the air cannon are carried out by establishing a theoretical calculation formula, the matching degree with the actual detection result is high, the mathematical model is reasonably established, and the aim of stably and continuously producing materials is fulfilled; meanwhile, the effect of clearing and flowing the flow aid is realized by forming the air cannon, the labor intensity is obviously reduced, the labor productivity is further improved, and the device is convenient to use, safe, time-saving and energy-saving.
References in this application to "first," "second," "third," "fourth," etc., if any, are intended to distinguish between similar elements and not necessarily to describe a particular order or sequence. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, or apparatus.
It should be noted that the descriptions in this application referring to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. The utility model provides an air cannon clear stifled class of flow aid device which characterized in that: comprises a gas storage tank, a three-way device and a three-way electromagnetic valve;
the gas storage tank is used for storing compressed gas;
the three-way device is used for jetting an air cannon into a storage bin for storing materials, the left end and the right end of the three-way device are provided with openings for being respectively connected with the air storage tank and the three-way electromagnetic valve, and one end of the three-way device is provided with an opening for being connected with the storage bin;
the three-way electromagnetic valve is used for opening and closing the three-way device and the air storage tank, one end opening is used for being connected with the three-way device and conveying air, one end opening is used for reversing exhaust, and the other end opening is used for allowing air to enter the three-way electromagnetic valve.
2. The air cannon blockage-removing and flow-assisting device according to claim 1, which is characterized in that: still include with three solenoid valve connects gradually air filtration pressure reducer, check valve and ball valve, the ball valve is used for controlling the air to pass through the check valve gets into the air filtration pressure reducer.
3. The air cannon blockage-removing and flow-assisting device of claim 2, which is characterized in that: the three-way electromagnetic valve is a two-position three-way electromagnetic valve.
4. The air cannon block-clearing and flow-aiding device of claim 3, which is characterized in that: the three-way device comprises a device barrel and an air flushing device, wherein the two ends of the device barrel are respectively connected with the air storage tank and a two-position three-way electromagnetic valve, the air flushing device is used for being connected with the storage bin, the inner diameter of one end of the device barrel, which is connected with the air storage tank, is larger than that of the other end of the device barrel, the air flushing device is fixed at one end of the device barrel, which is connected with the air storage tank, a main valve flap is inserted into one end of the device barrel, the air storage tank is connected with a valve seat inserted into the device barrel, and the two-position three-way electromagnetic valve drives the main.
5. The air cannon blockage-removing and flow-assisting device according to claim 4, wherein: an auxiliary spring and an auxiliary valve clack which are connected in sequence are arranged between the valve seat and the main valve clack, and a main spring is arranged between the main valve clack and the inner side of one end of the device barrel connected with the two-position three-way electromagnetic valve.
6. The air cannon blockage-removing and flow-assisting device as claimed in claim 5, wherein the operation method of the device comprises the following steps:
step 1, inputting air into a device cylinder through a two-position three-way electromagnetic valve, forming a cavity B and a cavity A which are positioned at the left end and the right end of a main valve in the device cylinder of the three-way device and a cavity C in an air flushing device, wherein the cavity B is communicated with an air storage tank, the air pressure in the cavity A and the cavity B is equal, and the cavity C is connected and closed with the cavity B;
step 2, controlling the two-position three-way electromagnetic valve to change the position, so that air in the cavity A is exhausted in a reversing way through an opening at one end of the two-position three-way electromagnetic valve;
step 3, the air pressure in the cavity A is reduced and is smaller than the air pressure in the cavity B, the auxiliary spring moves towards one end of the main spring and quickly pushes the main valve flap to move towards one end of the cavity A, and the cavity C is communicated with the cavity B;
step 4, spraying an air cannon into a bin connected with the air blast device by compressed air of the air storage tank through the cavity B and the cavity C, and clearing the bin;
and 5, controlling the two-position three-way electromagnetic valve to change the position, enabling the gas to enter the cavity A through the two-position three-way electromagnetic valve, and controlling the gas pressure in the cavity A to be equal to that in the cavity B.
7. The air cannon blockage-removing and flow-assisting device according to claim 6, which is characterized in that: in step 1, a pretightening force Q is formed between the main valve flap and the main springyAnd the main valve flap is subjected to a medium force QJA sealing force Q is formed between the main valve flap and the gas storage tankm；
Qy＝Pj·π/4(d0+bM)2；
Wherein Q isyFor spring pre-tightening (N), PJTo design the pressure (MPa), d0Is the inner diameter (mm) of the valve seat, bMSealing surface width (mm);
QJ＝P·π/4(d0+bM)2；
wherein Q isJThe medium force (N) borne by the main valve is adopted, and P is the working pressure (MPa) of the air storage tank;
Qm＝Qy-QJ＝(Pj-P)·π/4(d0+bM)2；
wherein Q ismIs the sealing force (N);
and QmGreater than 0.
8. The air cannon blockage-removing and flow-assisting device as claimed in claim 7, further comprising the following sealing and checking steps:
s1, performing allowable specific pressure check according to the working condition without medium, namely:
Figure FDA0002385587380000021
wherein q isMFTo seal the specific pressure, qMFAccording to different material experiments of the sealing surface;
and S2, performing necessary pressure comparison check at the working pressure, namely:
Figure FDA0002385587380000031
wherein [ q ] is the necessary specific pressure, [ q ] is determined according to different material experiments of the sealing surface.
9. The air cannon blockage-removing and flow-assisting device as claimed in claim 7, wherein the stiffness of the main spring and the stiffness of the auxiliary spring are both λ, and:
λ＝1/h(Pj-P)·π/4(d0+bM)2；
wherein, lambda is the rigidity value (N/mm), and h is the maximum height (mm) of the main valve flap.
10. The air cannon blockage-removing and flow-assisting device of claim 6, wherein in step 4, the impact force of the air cannon is F, and:
F＝G2·C2；
G2＝AC2/v2；
v2＝RT2/P2；
Figure FDA0002385587380000032
wherein F is the impact force (N), G2Is the mass flow (Kg/s) in the air-blast device, and A is the cross-sectional area (m) of the air-blast device2)，v2Is the specific volume (m) of air in the air-blast device3/Kg), R is a gas state constant and R is 0.287 KJ/Kg.K, CpIs gas with constant pressure and specific heat capacity and is air Cp＝1004KJ/Kg·K；
P1、T1And C1Respectively the air pressure (MPa), temperature (K) and flow velocity (m/s), C1＝0；
P2、T2And C2Respectively the air pressure (MPa), temperature (K) and flow velocity (m/s) when the air impact device releases air.
CN202010097428.8A 2020-02-17 2020-02-17 Blockage clearing and flow assisting device for air cannon Pending CN111169825A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112722723A (en) * 2020-12-24 2021-04-30 安徽江南化工股份有限公司 Material dredging device for field mixed loading ammonium nitrate fuel oil explosive truck

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112722723A (en) * 2020-12-24 2021-04-30 安徽江南化工股份有限公司 Material dredging device for field mixed loading ammonium nitrate fuel oil explosive truck

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