CN216110657U - Gravel throwing valve assembly and forward gravel throwing device - Google Patents
Gravel throwing valve assembly and forward gravel throwing device Download PDFInfo
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- CN216110657U CN216110657U CN202122914174.7U CN202122914174U CN216110657U CN 216110657 U CN216110657 U CN 216110657U CN 202122914174 U CN202122914174 U CN 202122914174U CN 216110657 U CN216110657 U CN 216110657U
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Abstract
The utility model discloses a gravel throwing valve assembly which comprises a joint body, a pushing sealing head, an adapter, a one-way valve and a main valve body, wherein in an initial state, the one-way valve is abutted against the adapter, the one-way valve shields a diversion trench, when gravel throwing construction is carried out, a gravel throwing pipe is connected with the joint body, the pushing sealing head is driven to move downwards by the gravel throwing pipe and the joint body, the pushing sealing head blocks the one-way valve and drives the one-way valve to move downwards, the one-way valve slides downwards in the main valve body, gravel is thrown when the gravel throwing hole is overlapped with the diversion trench, the gravel reaches a throwing position through the gravel throwing hole and the diversion trench, after the gravel throwing is finished, the joint body, the gravel throwing pipe and the one-way valve move upwards, the diversion trench is blocked again by the one-way valve, the pushing sealing head is separated from the one-way valve, and an inner cavity of the main valve is communicated with an inner cavity of the adapter by the one-way valve. The utility model also provides a forward gravel throwing device, which utilizes the gravel throwing valve component to smoothly realize forward gravel throwing and reduce the construction cost.
Description
Technical Field
The utility model relates to the technical field of geological drilling construction, in particular to a gravel throwing valve assembly and a forward gravel throwing device.
Background
The basic principle of the technology is to drill holes in a process which is distributed according to a certain mesh degree on an in-situ leachable sandstone type uranium ore, inject a leaching agent from a liquid injection hole, enable the leaching agent to fully react with uranium to form a leaching liquid, and carry out the process of extracting uranium in an earth surface factory.
The construction process comprises the steps of installing a sleeve after the construction of a bare hole is completed, carrying out full-hole reverse cement slurry injection, then cutting a target ore layer section, windowing the sleeve and a cement ring, and opening a hydraulic connection working channel. Then, a built-in filter is put into the cut ore bed section, and finally, gravel is reversely thrown. The gravel material that adopts at present is the PE material, uses rivers to bring in, because of density is less than water, through throwing the gravel device backward at annular space come-up, rivers from filter entering sleeve pipe return earth's surface. The artificial gravel adopted by the process has the following problems: firstly, the density is less than that of water, the buoyancy is difficult to put in, and secondly, the cost is high compared with quartz sand, and the construction cost is increased.
Therefore, how to change the current situation that gravel throwing operation is difficult and construction cost is high in the ground leaching well drilling construction in the prior art becomes a problem to be solved urgently by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a gravel throwing valve assembly and a forward gravel throwing device, which are used for solving the problems in the prior art, reducing the difficulty of gravel throwing operation in drilling construction, reducing the construction cost and improving the construction efficiency.
In order to achieve the purpose, the utility model provides the following scheme: the utility model provides a gravel throwing valve component which comprises a connector body, a pushing sealing head, an adapter, a one-way valve and a main valve body, wherein the connector body can be communicated with a gravel throwing pipe, one end of the connector body can slidably extend into the adapter, one end of the connector body extending into the adapter is connected with the pushing sealing head, the main valve body is connected with the adapter, the one-way valve is slidably arranged in the main valve body, an elastic part is further arranged between the one-way valve and the main valve body, the sliding direction of the one-way valve relative to the main valve body is parallel to the sliding direction of the connector body relative to the adapter, the adapter can abut against the one-way valve and limit the limit position of the one-way valve, the one-way valve is of a hollow structure, and the inner cavity of the connector body can be communicated with the inner cavity of the main valve body through the one-way valve, the pushing sealing head is detachably connected with the one-way valve, and when the pushing sealing head can be connected with the one-way valve, the pushing sealing head abuts against the one-way valve;
the side wall of the main valve body is provided with a diversion trench, the diversion trench is communicated with the inner cavity of the main valve body, the side wall of the joint body is provided with a gravel throwing hole, the gravel throwing hole is communicated with the inner cavity of the joint body, the joint body and the one-way valve are coaxially arranged, and the projection of the diversion trench in the axial direction can coincide with the projection of the gravel throwing hole in the axial direction.
Preferably, one end of the pushing sealing head extends into the inner cavity of the joint body, the axial distance between the end of the pushing sealing head extending into the joint body and the one-way valve is larger than the minimum axial distance between the gravel throwing hole and the one-way valve, and the end of the pushing sealing head extending into the inner cavity of the joint body is of a conical structure.
Preferably, the bottom surface of the diversion trench inclines towards the bottom of the main valve body from the inner wall of the main valve body to the outer wall of the main valve body.
Preferably, the outside cover of check valve is equipped with sealing washer, the check valve with when the adapter offsets, sealing washer can the shutoff the check valve with gap between the adapter.
Preferably, the number of the diversion trenches and the gravel throwing holes is four, the diversion trenches correspond to the gravel throwing holes one by one, the diversion trenches are uniformly distributed around the circumferential direction of the axis of the main valve body, and the gravel throwing holes are uniformly distributed around the circumferential direction of the axis of the joint body.
Preferably, the pushing sealing head can be connected with the one-way valve in an inserting manner; the adapter with main valve body threaded connection.
The utility model also provides a forward gravel throwing device comprising the gravel throwing valve assembly, and the forward gravel throwing device further comprises a gravel throwing pipe, wherein the gravel throwing pipe is detachably connected with the joint body, and the inner cavity of the gravel throwing pipe is communicated with the inner cavity of the joint body.
Preferably, the forward gravel throwing device further comprises a built-in filter, a packer and a casing, wherein the built-in filter comprises a sand setting pipe, a main filter and an upper filter short section, the main filter is arranged at the bottom of the gravel throwing valve assembly, the sand setting pipe is arranged at the bottom of the main filter, the upper filter short section is arranged at the top of the gravel throwing valve assembly, the casing is sleeved outside the upper filter short section and the gravel throwing valve assembly, the packer is arranged in the casing, and the packer can block a gap between the built-in filter and the casing; and the upper filter short section is connected with the adapter.
Compared with the prior art, the utility model has the following technical effects: the gravel throwing valve component comprises a joint body, a pushing sealing head, an adapter, a one-way valve and a main valve body, wherein the joint body can be communicated with a gravel throwing pipe, one end of the joint body can slidably extend into the adapter, one end of the joint body extending into the adapter is connected with the pushing sealing head, the main valve body is connected with the adapter, the one-way valve is slidably arranged in the main valve body, an elastic part is further arranged between the one-way valve and the main valve body, the sliding direction of the one-way valve relative to the main valve body is parallel to the sliding direction of the joint body relative to the adapter, the adapter can abut against the one-way valve and limit the limit position of the one-way valve, the one-way valve is of a hollow structure, an inner cavity of the joint body can be communicated with an inner cavity of the main valve body through the one-way valve, the pushing sealing head is detachably connected with the one-way valve, and when the pushing sealing head can be connected with the one-way valve, the pushing sealing head abuts against the one-way valve; the side wall of the main valve body is provided with a diversion trench which is communicated with the inner cavity of the main valve body, the side wall of the joint body is provided with a gravel throwing hole which is communicated with the inner cavity of the joint body, the joint body and the one-way valve are coaxially arranged, and the projection in the axial direction of the diversion trench can coincide with the projection in the axial direction of the gravel throwing hole.
The gravel throwing valve component comprises a main valve body, a gravel throwing pipe, a gravel throwing hole, a gravel guiding groove, a pushing sealing head, a gravel throwing hole, a gravel throwing valve, a main valve body, a gravel throwing valve, a pushing sealing head, an elastic piece and a connecting piece.
The utility model also provides a forward gravel throwing device, which utilizes the gravel throwing valve component to smoothly realize forward gravel throwing, reduce the gravel throwing operation difficulty and reduce the construction cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a sectional view of the gravel delivery valve assembly of the present invention;
FIG. 2 is a sectional view of the gravel-throwing valve assembly of the present invention in a gravel throwing state;
FIG. 3 is a sectional view of the joint body of the gravel delivery valve assembly of the present invention;
FIG. 4 is a cross-sectional view of an adapter of the gravel delivery valve assembly of the present invention;
FIG. 5 is a sectional view of the one-way valve of the gravel delivery valve assembly of the present invention;
FIG. 6 is a sectional view of the main valve body of the gravel delivery valve assembly of the present invention;
FIG. 7 is a sectional view of the push seal head of the gravel delivery valve assembly of the present invention;
FIG. 8 is a schematic view of the forward gravel placement apparatus of the present invention in operation;
wherein, 100 is for throwing the gravel valve subassembly, 1 is the joint body, 2 are the propelling movement sealing head, 3 are the adapter, 4 are the check valve, 5 are the main valve body, 6 are for throwing the gravel pipe, 7 are the guiding gutter, 8 are for throwing the gravel hole, 9 are the elastic component, 10 are the sand setting pipe, 11 are main filter, 12 are the upper filter nipple joint, 13 are the packer, 14 are the sleeve pipe, 15 are cutting interval.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
The utility model aims to provide a gravel throwing valve assembly and a forward gravel throwing device, which are used for solving the problems in the prior art, reducing the difficulty of gravel throwing operation in drilling construction, reducing the construction cost and improving the construction efficiency.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1-8, fig. 1 is a schematic view of a cut-away structure of a gravel-casting valve assembly of the present invention, fig. 2 is a schematic view of a cut-away structure of a joint body of the gravel-casting valve assembly of the present invention in a gravel-casting state, fig. 3 is a schematic view of a cut-away structure of a joint body of the gravel-casting valve assembly of the present invention, fig. 4 is a schematic view of a cut-away structure of an adapter of the gravel-casting valve assembly of the present invention, fig. 5 is a schematic view of a cut-away structure of a check valve of the gravel-casting valve assembly of the present invention, fig. 6 is a schematic view of a cut-away structure of a main valve body of the gravel-casting valve assembly of the present invention, fig. 7 is a schematic view of a cut-away structure of a push seal head of the gravel-casting valve assembly of the present invention, and fig. 8 is a schematic view of a forward gravel-casting device of the present invention in operation.
The utility model provides a gravel throwing valve assembly 100 which comprises a connector body 1, a pushing sealing head 2, an adapter 3, a one-way valve 4 and a main valve body 5, wherein the connector body 1 can be communicated with a gravel throwing pipe 6, one end of the connector body 1 can extend into the adapter 3 in a sliding manner, one end of the connector body 1 extending into the adapter 3 is connected with the pushing sealing head 2, the main valve body 5 is connected with the adapter 3, the one-way valve 4 is arranged in the main valve body 5 in a sliding manner, an elastic piece 9 is arranged between the one-way valve 4 and the main valve body 5, the sliding direction of the one-way valve 4 relative to the main valve body 5 is parallel to the sliding direction of the connector body 1 relative to the adapter 3, the adapter 3 can abut against the one-way valve 4 and limit the limit position of the one-way valve 4, the one-way valve 4 is of a hollow structure, the inner cavity of the connector body 1 can be communicated with the inner cavity of the main valve body 5 through the one-way valve 4, and the pushing sealing head 2 is detachably connected with the one-way valve 4, when the pushing sealing head 2 can be connected with the one-way valve 4, the pushing sealing head 2 can be abutted against the one-way valve 4; the side wall of the main valve body 5 is provided with a diversion trench 7, the diversion trench 7 is communicated with the inner cavity of the main valve body 5, the side wall of the joint body 1 is provided with a gravel throwing hole 8, the gravel throwing hole 8 is communicated with the inner cavity of the joint body 1, the joint body 1 and the one-way valve 4 are coaxially arranged, and the projection of the diversion trench 7 in the axial direction can coincide with the projection of the gravel throwing hole 8 in the axial direction.
In the gravel throwing valve assembly 100 of the utility model, in an initial state, the one-way valve 4 is abutted against the adapter 3, the one-way valve 4 shields the diversion trench 7, when gravel throwing construction is carried out, the gravel throwing pipe 6 is connected with the joint body 1, the gravel throwing pipe 6 and the joint body 1 are utilized to drive the pushing sealing head 2 to move downwards, the pushing sealing head 2 is abutted against the one-way valve 4 and seals the one-way valve 4, and drives the one-way valve 4 to move downwards, the one-way valve 4 slides downwards in the main valve body 5, when the gravel throwing hole 8 is superposed with the diversion trench 7, gravel materials are thrown in, the gravel materials reach a throwing position through the gravel throwing holes 8 and the diversion trenches 7, after the gravel throwing is finished, under the action of the elastic piece 9, the connector body 1, the gravel throwing pipe 6 and the one-way valve 4 move upwards, the one-way valve 4 blocks the diversion trench 7 again, the pushing sealing head 2 is separated from the one-way valve 4, and the inner cavity of the main valve body 5 is communicated with the inner cavity of the adapter 3 through the one-way valve 4.
Wherein, set up elastic component 9 between 4 subassemblies of check valve and the main valve body 5, throw gravel pipe 6 and connect body 1 and utilize propelling movement sealed head 2 to promote check valve 4 downstream, need overcome the effort of elastic component 9 and make its compression, throw the gravel and accomplish the back, under the effort that elastic component 9 resumes deformation, check valve 4 can reset smoothly, improves the reliability of device. In this embodiment, the elastic member 9 is a spring, which prevents the elastic member 9 from blocking the inner cavity of the main valve body 5, and the main valve body 5 has a groove capable of accommodating the elastic member 9, which prevents the elastic member 9 from being dislocated.
Specifically, the one end of the sealed head 2 of propelling movement stretches into the inner chamber that connects body 1, the one end that the sealed head 2 of propelling movement stretches into the inner chamber that connects body 1 is coniform structure, coniform structure can effectively avoid the gravel material to pile up in the inner chamber that connects body 1, the conical surface of slope makes the gravel material fall smoothly, the sealed head 2 of propelling movement stretches into the axial distance between one end that connects body 1 and check valve 4 and than throw the minimum axial distance between gravel hole 8 and the check valve 4 big, ensure that coniform structure can play a role.
Similarly, the bottom surface of the diversion trench 7 inclines towards the bottom of the main valve body 5 from the inner wall of the main valve body 5 to the outer wall of the main valve body 5, and the inclined arrangement of the bottom surface of the diversion trench 7 also avoids the accumulation of gravel, promotes the gravel to fall smoothly, and finishes the gravel throwing.
Wherein, the outside cover of check valve 4 is equipped with seal ring, and when check valve 4 offseted with adapter 3, seal ring offseted with main valve body 5, can shutoff gap between check valve 4 and the adapter 3, played the sealing effect, seal ring can select the seal ring of O type circle or other structures.
In the embodiment, the number of the diversion trenches 7 and the gravel throwing holes 8 is four, the diversion trenches 7 correspond to the gravel throwing holes 8 one by one, the diversion trenches 7 are uniformly distributed around the axis of the main valve body 5 in the circumferential direction, and the gravel throwing holes 8 are uniformly distributed around the axis of the connector body 1 in the circumferential direction, so that the gravel throwing uniformity is improved.
More specifically, sealed head 2 of propelling movement can be pegged graft with check valve 4 and link to each other, takes place the dislocation when avoiding promoting check valve 4, improves the check valve 4 reciprocating motion accuracy, and simultaneously, sealed head 2 of propelling movement links to each other with check valve 4 pegs graft and makes things convenient for the well kenozooecium of shutoff check valve 4. In addition, adapter 3 and the 5 threaded connection of main valve body, connect the fastening, easy dismounting.
The utility model also provides a forward gravel throwing device comprising the gravel throwing valve assembly 100, and the forward gravel throwing device further comprises a gravel throwing pipe 6, wherein the gravel throwing pipe 6 is detachably connected with the joint body 1, and the inner cavity of the gravel throwing pipe 6 is communicated with the inner cavity of the joint body 1. In the specific embodiment, the gravel throwing pipe 6 is in threaded connection with the joint body 1, so that the construction convenience is improved.
Further, the forward gravel throwing device further comprises a built-in filter, a packer 13 and a sleeve 14, wherein the built-in filter comprises a sand setting pipe 10, a main filter 11, an upper filter short section 12 and a gravel throwing valve assembly 100, the main filter 11 is arranged at the bottom of the gravel throwing valve assembly 100, the sand setting pipe 10 is arranged at the bottom of the main filter 11, the upper filter short section 12 is arranged at the top of the gravel throwing valve assembly 100, the sleeve 14 is sleeved outside the upper filter short section 12 and the gravel throwing valve assembly 100, and the packer 13 can block a gap between the built-in filter and the sleeve 14; and the upper filter nipple 12 is in threaded connection with the adapter 3. It should be further noted that the upper filter nipple 12 is in threaded connection with the adapter 3, and tapered steps are arranged at two ends of the adapter 3, so that the effect of limiting the adapter body 1 and the check valve 4 is achieved. When the pushing sealing head 2 is connected with the one-way valve 4 in an inserting mode, the one-way valve 4 can be blocked, and gravel materials are prevented from entering the upper filter short section 12 through the one-way valve 4.
When the gravel is thrown by using the forward gravel throwing device, the sand-settling pipe 10, the main filter 11, the gravel throwing valve assembly 100, the upper filter short section 12 and the packer 13 are sequentially connected, the upper filter short section 12 is mainly used for returning water to a wellhead in the gravel throwing process, the sand-settling pipe 10, the main filter 11, the gravel throwing valve assembly 100, the upper filter short section 12 and the packer 13 are installed on a cutting ore section 15 in a drill hole through a drill rod, and after the packer 13 is pressed and sealed, a drill rod and a sealing tool are lifted out; then, the gravel throwing pipe 6 and the joint body 1 are connected with a descending sleeve 14, so that the pushing sealing head 2 is connected with the one-way valve 4 to block the through hole of the one-way valve 4, the one-way valve 4 is pushed to descend, and the descending guide groove 7 of the one-way valve 4 is completely exposed for throwing quartz gravel; the gravel throwing pipe 6 is connected with a slurry pump, the slurry pump is started, quartz gravel materials with the grain diameter of 3-5mm and water are pumped into the gravel throwing pipe 6 together, the gravel materials enter a space to be thrown through a gravel throwing hole 8 and a diversion trench 7, the water is returned to a well head through an upper filter short section 12, after the gravel throwing work is completed, the slurry pump is closed, the gravel throwing pipe 6 and a connector body 1 are lifted, a one-way valve 4 moves upwards under the action of an elastic piece 9 to shield the diversion trench 7, a pushing sealing head 2 is separated from the one-way valve 4, a through hole of the one-way valve 4 is not shielded, and a pumping and injecting liquid channel is smooth.
The forward gravel feeding device is utilized for gravel feeding construction, the gravel feeding pipe 6 is hermetically connected with the gravel feeding valve assembly 100, gravel materials are prevented from entering the sleeve 14, the gravel feeding effect is enhanced, and compared with a PE gravel material, the construction cost is reduced by using a quartz gravel material; the gravel throwing operation is carried out by utilizing the diversion trench 7, so that uniform gravel throwing is realized, and the gravel throwing construction work efficiency is improved.
The principle and the implementation mode of the utility model are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.
Claims (8)
1. A gravel delivery valve assembly, comprising: the connector comprises a connector body, a pushing sealing head, an adapter, a one-way valve and a main valve body, wherein the connector body can be communicated with a gravel throwing pipe, one end of the connector body can slidably extend into the adapter, one end of the connector body extending into the adapter is connected with the pushing sealing head, the main valve body is connected with the adapter, the one-way valve is slidably arranged in the main valve body, an elastic part is further arranged between the one-way valve and the main valve body, the sliding direction of the one-way valve relative to the main valve body is parallel to the sliding direction of the connector body relative to the adapter, the adapter can abut against the one-way valve and limit the limit position of the one-way valve, the one-way valve is of a hollow structure, an inner cavity of the connector body can be communicated with an inner cavity of the main valve body through the one-way valve, and the pushing sealing head is detachably connected with the one-way valve, when the pushing sealing head can be connected with the one-way valve, the pushing sealing head abuts against the one-way valve;
the side wall of the main valve body is provided with a diversion trench, the diversion trench is communicated with the inner cavity of the main valve body, the side wall of the joint body is provided with a gravel throwing hole, the gravel throwing hole is communicated with the inner cavity of the joint body, the joint body and the one-way valve are coaxially arranged, and the projection of the diversion trench in the axial direction can coincide with the projection of the gravel throwing hole in the axial direction.
2. The gravel delivery valve assembly of claim 1, wherein: one end of the pushing sealing head extends into the inner cavity of the joint body, the axial distance between one end of the pushing sealing head extending into the joint body and the one-way valve is larger than the minimum axial distance between the gravel throwing hole and the one-way valve, and one end of the pushing sealing head extending into the inner cavity of the joint body is of a conical structure.
3. The gravel delivery valve assembly of claim 2, wherein: the bottom surface of the diversion trench inclines towards the bottom of the main valve body from the inner wall of the main valve body to the outer wall of the main valve body.
4. The gravel delivery valve assembly of claim 1, wherein: the outside cover of check valve is equipped with seal ring, the check valve with when the adapter offseted, seal ring can the shutoff the check valve with gap between the adapter.
5. The gravel delivery valve assembly of claim 1, wherein: the flow guide grooves and the gravel throwing holes are four in number, the flow guide grooves correspond to the gravel throwing holes one to one, the flow guide grooves are uniformly distributed in the circumferential direction around the axis of the main valve body, and the gravel throwing holes are uniformly distributed in the circumferential direction around the axis of the joint body.
6. The gravel delivery valve assembly of claim 1, wherein: the pushing sealing head can be connected with the one-way valve in an inserting manner; the adapter with main valve body threaded connection.
7. A forward gravel delivery apparatus comprising the gravel delivery valve assembly of any of claims 1-6, wherein: the joint comprises a joint body and is characterized by further comprising a gravel throwing pipe, wherein the gravel throwing pipe is detachably connected with the joint body, and an inner cavity of the gravel throwing pipe is communicated with an inner cavity of the joint body.
8. The positive gravel delivery device of claim 7, wherein: the gravel throwing valve assembly is characterized by further comprising a built-in filter, a packer and a casing pipe, wherein the built-in filter comprises a sand setting pipe, a main filter and an upper filter short section, the main filter is arranged at the bottom of the gravel throwing valve assembly, the sand setting pipe is arranged at the bottom of the main filter, the upper filter short section is arranged at the top of the gravel throwing valve assembly, the casing pipe is sleeved outside the upper filter short section and the gravel throwing valve assembly, the packer is arranged in the casing pipe, and the packer can block a gap between the built-in filter and the casing pipe; and the upper filter short section is connected with the adapter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122914174.7U CN216110657U (en) | 2021-11-25 | 2021-11-25 | Gravel throwing valve assembly and forward gravel throwing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122914174.7U CN216110657U (en) | 2021-11-25 | 2021-11-25 | Gravel throwing valve assembly and forward gravel throwing device |
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| CN216110657U true CN216110657U (en) | 2022-03-22 |
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| CN202122914174.7U Active CN216110657U (en) | 2021-11-25 | 2021-11-25 | Gravel throwing valve assembly and forward gravel throwing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114016976A (en) * | 2021-11-25 | 2022-02-08 | 核工业北京化工冶金研究院 | Gravel throwing valve assembly, forward gravel throwing device and forward gravel throwing method |
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2021
- 2021-11-25 CN CN202122914174.7U patent/CN216110657U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114016976A (en) * | 2021-11-25 | 2022-02-08 | 核工业北京化工冶金研究院 | Gravel throwing valve assembly, forward gravel throwing device and forward gravel throwing method |
| CN114016976B (en) * | 2021-11-25 | 2024-09-13 | 核工业北京化工冶金研究院 | Gravel throwing valve assembly, forward gravel throwing device and forward gravel throwing method |
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