CN220037631U - Auxiliary paving device for underground ventilation pipe - Google Patents
Auxiliary paving device for underground ventilation pipe Download PDFInfo
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- CN220037631U CN220037631U CN202321365285.XU CN202321365285U CN220037631U CN 220037631 U CN220037631 U CN 220037631U CN 202321365285 U CN202321365285 U CN 202321365285U CN 220037631 U CN220037631 U CN 220037631U
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- ventilation pipe
- pipe section
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- support
- supporting
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- 238000009423 ventilation Methods 0.000 title claims abstract description 109
- 210000001503 joint Anatomy 0.000 claims abstract description 19
- 230000002787 reinforcement Effects 0.000 claims description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 125000003003 spiro group Chemical group 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The utility model relates to an underground ventilation pipe auxiliary laying device, which comprises a supporting piece, a ventilation pipe section, a fixing component and a butt joint pipe section, wherein the supporting piece is arranged on the ventilation pipe section; the support piece is used for being fixed on the well wall along the extending direction of the well wall; one end of the fixing component is connected with the supporting piece, and the other end of the fixing component is connected with the outer wall of the ventilation pipe section; the fixing components are arranged in a telescopic manner in the vertical direction and distributed on the ventilation pipe section; the butt joint pipe section is used for ventilation pipe layout, and is communicated with the ventilation pipe section below the ventilation pipe section. The auxiliary paving device has the beneficial effects that the stability of the underground ventilation pipe can be improved, and the applicability is stronger. In addition, set up the butt joint pipeline section in ventilation pipeline section's below, the butt joint pipeline section can rotate for ventilation pipeline section, satisfies the different demands of ventilation pipeline in the pit in the process of laying, has simplified the structure of laying, has practiced thrift the cost of laying.
Description
Technical Field
The utility model relates to the technical field of mine ventilation equipment, in particular to an underground ventilation pipe auxiliary paving device.
Background
At present, along with the rapid development of society, various resources are continuously mined from underground, along with the extension of mine mining depth, mine ventilation faces more and more difficulties, dust in a mine is much, high-concentration dust can cause environmental pollution, hidden danger is brought to safe production, and therefore people need to ventilate the mine; mine ventilation introduces fresh air into the mine downhole, increasing the downhole oxygen concentration to dilute and remove toxic, harmful gases and dust from the mine.
However, due to the fact that the underground environment is complex, the existing ventilation pipe paving device is adopted, the overall adaptability of the paved ventilation pipe is low, and the stability of the ventilation pipe is poor; in addition, in order to meet ventilation requirements, ventilation pipeline layout is required to be related in the mine, the underground layout process is complicated, and consumption of ventilation pipeline consumables is increased intangibly.
Therefore, there is a need to develop an auxiliary paving device for underground ventilation pipes to solve the above technical problems.
Disclosure of Invention
First, the technical problem to be solved
In view of the above-mentioned shortcomings and disadvantages of the prior art, the utility model provides an auxiliary laying device for underground ventilation pipes, which solves the technical problems of unstable arrangement of the underground ventilation pipes and complicated layout process of the ventilation pipes in the prior art.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps:
in a first aspect, an embodiment of the present utility model provides an auxiliary paving apparatus for an underground ventilation pipe, including a support member, a ventilation pipe section, a fixing assembly, and a docking pipe section; the support piece is used for being fixed on the well wall along the extending direction of the well wall; one end of the fixing component is connected with the supporting piece, and the other end of the fixing component is connected with the outer wall of the ventilation pipe section; the fixing components are arranged in a telescopic manner in the vertical direction and distributed on the ventilation pipe section; the butt joint pipe section is used for ventilation pipe layout, and is communicated with the ventilation pipe section below the ventilation pipe section.
Optionally, the fixing assembly comprises a fixing piece and a reinforcement; one end of the fixing piece is connected with the supporting piece, and the other end of the fixing piece is connected with the outer wall of the ventilation pipe section; one end of the reinforcement member is connected with the supporting piece, and the other end of the reinforcement member is connected with the outer wall of the ventilation pipe section; the fixing piece comprises a fixing ring and a connecting part; the connecting part is of a telescopic structure, one end of the connecting part is fixed on the supporting piece, the other end of the connecting part is connected to the outer side of the fixed ring, and the fixed ring is sleeved on the ventilation pipe section; the fixing pieces are distributed on the ventilation pipe section at intervals, and the reinforcing pieces are distributed on the ventilation pipe section at intervals.
Optionally, the connecting part comprises a first supporting rod, a second supporting rod and a third supporting rod; the first supporting rod is arranged above the fixed ring along the vertical direction; the second support rod and the first support rod are arranged above the fixed ring at a first designated angle; the third support rods and the first support rods are arranged above the fixed ring at a second designated angle; the first support rod, the second support rod and the third support rod are of telescopic structures, and one ends, far away from the fixing ring, of the first support rod, the second support rod and the third support rod are connected to the supporting piece.
Optionally, the connecting part further comprises a mounting frame; the installation frame is fixed in fixed ring top, the lower extreme spiro union of first bracing piece in the installation frame, the second bracing piece with the one end that the third bracing piece is close to fixed ring all articulates in on the installation frame.
Optionally, the reinforcement comprises a support plate and a lifting rod; one ends of the two lifting rods are respectively hinged to two ends of the supporting plate, the other ends of the two lifting rods are connected to the supporting piece, and the upper surface of the supporting plate is abutted to the lower part of the ventilation pipe section; the two lifting rods are of telescopic structures.
Optionally, a plurality of the butt-jointed pipe sections are rotatable about a vertical direction with respect to the ventilation pipe section.
Optionally, the supporting piece comprises three supporting bars which extend in parallel and are used for being fixed on the well wall; the first support rod is correspondingly connected with the support bar positioned in the middle, and the second support rod and the third support rod are respectively correspondingly connected with the support bars positioned at two sides.
(III) beneficial effects
The beneficial effects of the utility model are as follows: according to the auxiliary paving device for the underground ventilation pipe, due to the fact that the supporting piece and the fixing component are matched, the ventilation pipe section is more stable underground. Meanwhile, the telescopic connecting part is adopted, so that the length of the connecting part can be adjusted according to different underground environments and installation positions, and the adaptability is better. Compared with the prior art, the auxiliary paving device provided by the utility model can improve the stability of the underground ventilation pipe and has stronger applicability.
In addition, set up the butt joint pipeline section in ventilation pipeline section's below, the butt joint pipeline section can rotate for ventilation pipeline section, satisfies the different demands of ventilation pipeline in the pit in the process of laying, has simplified the structure of laying, has practiced thrift the cost of laying.
Drawings
FIG. 1 is a schematic perspective view of an embodiment 1 of a downhole ventilation pipe auxiliary laying apparatus of the present utility model;
FIG. 2 is a schematic perspective view of the fixing member of FIG. 1;
FIG. 3 is a schematic perspective view of the fastener of FIG. 1;
FIG. 4 is a schematic view of an exploded view of the support pole of FIG. 3;
fig. 5 is a schematic perspective view of the butt joint pipe section in fig. 1.
[ reference numerals description ]
1: a support; 11: a support bar; 2: a ventilation pipe section; 3: a fixing member; 31: a fixing ring; 32: a connection part; 321: a first support bar; 322: a second support bar; 323: a third support bar; 324: a mounting frame; 4: a reinforcement; 41: a support plate; 42: lifting rod; 5: butt joint pipe sections; 51: a connecting ring; a: a first specified angle; b: a second specified angle.
Detailed Description
The underground ventilation pipe auxiliary laying device provided by the embodiment of the utility model aims at the technical problems of unstable arrangement of the underground ventilation pipe and complicated layout process of the existing underground ventilation pipe, and the ventilation pipe section is more stable underground due to the cooperation of the supporting piece and the fixing component. Meanwhile, the telescopic connecting part is adopted, so that the length of the connecting part can be adjusted according to different underground environments and installation positions, and the adaptability is better. Compared with the prior art, the auxiliary paving device provided by the utility model can improve the stability of the underground ventilation pipe and has stronger applicability.
In addition, set up the butt joint pipeline section in ventilation pipeline section's below, the butt joint pipeline section can rotate for ventilation pipeline section, satisfies the different demands of ventilation pipeline in the pit in the process of laying, has simplified the structure of laying, has practiced thrift the cost of laying.
In order that the above-described aspects may be better understood, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
Example 1:
referring to fig. 1, 2 and 5, the embodiment provides an auxiliary laying device for an underground ventilation pipe, which comprises a support member 1, a ventilation pipe section 2, a fixing assembly and a butt joint pipe section 5, wherein the support member 1 is used for being fixed on a well wall along the extending direction of the well wall so as to provide a supporting point for laying the underground ventilation pipe, and the support member 1 can be provided with a plurality of mutually parallel steel ropes or steel bars, and has a certain bearing capacity after being fixed on the well wall; the upper end of the fixing component is connected with the supporting piece 1, the lower end of the fixing component is connected with the outer wall of the ventilation pipe section 2, the fixing component is arranged in a telescopic manner in the vertical direction and distributed on the ventilation pipe section 2, the fixing component provides a stable fixing effect for the ventilation pipe section 2, and meanwhile, the length of the connecting part 32 can be adjusted according to different underground environments and installation positions, so that the adaptability is better; the butt joint pipe section 5 is used for the ventilation pipe layout, and in ventilation pipe section 2 is communicated in ventilation pipe section 2's below, when needs ventilation pipe turns to or shunts, satisfy the different demands of ventilation pipe in the pit with the help of the butt joint pipe section, as shown in fig. 5, butt joint pipe section 5 divide into three sections, the middle one section is go-between 51, go-between 51 is used for simultaneously communicating additional upper segment and hypomere, the upper segment is used for communicating ventilation pipe section 2, the hypomere is used for being linked to ventilation pipe section 2 that other directions extend, the hypomere can rotate around vertical direction relative go-between 51, with the arbitrary change direction of connection, simultaneously, a plurality of butt joint pipe sections 5 use simultaneously, with the complex assembly environment in the adaptation pit, the structure of laying has been simplified, the cost of having practiced thrift.
Referring to fig. 1 and 2, the present embodiment provides a downhole ventilation pipe auxiliary laying apparatus, the fixing assembly comprising a fixing member 3 and a reinforcing member 4. One end of the fixing piece 3 is connected with the supporting piece 1, the other end is connected with the outer wall of the ventilation pipe section 2, namely, the fixing piece 3 is used for directly fixing the ventilation pipe section 2 on the supporting piece 1, and a plurality of fixing pieces 3 are distributed on the ventilation pipe section 2 at intervals in order to meet the ventilation pipe sections 2 with different lengths. Further, in order to ensure the fixing effect of the fixing member 3 on the ventilation pipe section 2, the fixing member 3 includes a fixing ring 31 and a connecting portion 32, the connecting portion 32 is of a telescopic structure, one end of the connecting portion 32 is fixed on the support member 1, the other end is connected to the outer side of the fixing ring 31, and the fixing ring 31 is sleeved on the ventilation pipe section 2. Furthermore, in order to prevent the ventilation pipe section 2 from being in an edge shape or falling off in the use process, a reinforcement member 4 is provided, one end of the reinforcement member 4 is connected with the supporting member 1, the other end is connected with the outer wall of the ventilation pipe section 2, and a plurality of reinforcement members 4 are distributed on the ventilation pipe section 2 at intervals; the reinforcement 4 and the fixing element 3 can be arranged at intervals, so that the support effect on the ventilation pipe section 2 is better.
Referring to fig. 1, 2 and 4, the present embodiment provides an auxiliary paving device for an underground ventilation pipe, in order to better perform stable connection and telescopic action of a connecting portion 32, the connecting portion 32 includes a first support rod 321, a second support rod 322 and a third support rod 323, the first support rod 321 is disposed above a fixed ring 31 along a vertical direction, the second support rod 322 and the first support rod 321 form a first designated angle a and are disposed above the fixed ring 31, the third support rod 323 and the first support rod 321 form a second designated angle b and are disposed above the fixed ring 31, the first support rod 321, the second support rod 322 and the third support rod 323 are all telescopic structures, and one ends of the first support rod 321, the second support rod 322 and the third support rod 323, which are far from the fixed ring 31, are all connected to a support member 1; the first support bar 321, the second support bar 322, and the third support bar 323 are similar in structure, except that specific installation positions are distinguished, and are hereinafter collectively referred to as support bars.
Wherein, three support rods are mutually matched, each support rod is respectively corresponding to one steel rope or steel rod fixed on the support piece 1, and the stability of the connecting part 32 can be enhanced under the condition of complex underground operation environment by utilizing the triangle stability principle; in addition, the three support rods are all telescopic structures, and can adapt to different working conditions of the well wall by matching the first designated angle a and the second designated angle b, so that the adaptive adjustment can be performed, for example, the angles between the second support rod 322, the third support rod 323 and the first support rod 321 can be adjusted arbitrarily, and the lengths of the three support rods can be adjusted arbitrarily; as shown in fig. 4, in order to make the support rod telescopic and ensure the support strength, the support rod is provided with a structure with two ends capable of being adjusted by threads, when the connecting part 32 is adjusted to a stable support state, the connection part can be kept unchanged, and when the connection part faces an uneven well wall, the ventilation pipe section 2 can be ensured not to bend in an effort to ensure the ventilation efficiency; the first designated angle a and the second designated angle b may be equal or unequal, and are specifically adjusted according to needs.
Referring to fig. 2, in order to facilitate flexible adjustment of the connection portion 32, the embodiment provides an auxiliary paving device for an underground ventilation pipe, which is further provided with a mounting frame 324, wherein the mounting frame 324 is fixed above the fixing ring 31, the lower end of the first support rod 321 is screwed to the mounting frame 324, and one ends of the second support rod 322 and the third support rod 323, which are close to the fixing ring 31, are hinged to the mounting frame 324, so that adjustment of the first designated angle a and the second designated angle b is facilitated.
Referring to fig. 3, this embodiment provides an auxiliary laying device for an underground ventilation pipe, in order to facilitate the installation of the reinforcement 4 and better perform auxiliary supporting function, the reinforcement 4 includes a supporting plate 41 and lifting rods 42, one ends of the two lifting rods 42 are respectively hinged at two ends of the supporting plate 41, the other ends of the two lifting rods 42 are connected to the supporting piece 1, at this time, the two lifting rods 42 can be respectively correspondingly installed at two steel ropes or steel rods of the supporting piece 1, the upper surface of the supporting plate 41 is abutted to the lower part of the ventilation pipe section 2, the two lifting rods 42 are in a telescopic structure, specifically referring to the form of the supporting rod shown in fig. 4, the length can also be adjusted according to needs, and meanwhile, one ends of the two lifting rods 42 are respectively hinged at two ends of the supporting plate 41, and the installation angle between the lifting rods 42 and the supporting plate 41 can be adjusted according to specific needs.
Referring to fig. 1, 2 and 5, the present embodiment provides an auxiliary paving apparatus for an underground ventilation pipe, in which the supporting member 1 includes three supporting bars 11 extending in parallel for fixing on a well wall, the first supporting bar 321 is correspondingly connected to the supporting bar 11 located in the middle, and the second supporting bar 322 and the third supporting bar 323 are correspondingly connected to the supporting bars 11 located at both sides, respectively, in order to simplify the overall structure.
In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.
In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.
Claims (7)
1. An auxiliary laying device of an underground ventilation pipe is characterized in that:
comprises a supporting piece (1), a ventilation pipe section (2), a fixing component and a butt joint pipe section (5);
the support piece (1) is used for being fixed on the well wall along the extending direction of the well wall;
one end of the fixing component is connected with the supporting piece (1), and the other end of the fixing component is connected with the outer wall of the ventilation pipe section (2);
the fixing components are arranged in a telescopic manner in the vertical direction and distributed on the ventilation pipe section (2);
the butt joint pipe section (5) is used for ventilation pipe layout and is communicated with the ventilation pipe section (2) below the ventilation pipe section (2).
2. A downhole ventilation pipe auxiliary laying apparatus according to claim 1, wherein:
the fixing assembly comprises a fixing piece (3) and a reinforcing piece (4);
one end of the fixing piece (3) is connected with the supporting piece (1), and the other end of the fixing piece is connected with the outer wall of the ventilation pipe section (2);
one end of the reinforcement member (4) is connected with the support piece (1), and the other end of the reinforcement member is connected with the outer wall of the ventilation pipe section (2);
the fixing piece (3) comprises a fixing ring (31) and a connecting part (32);
the connecting part (32) is of a telescopic structure, one end of the connecting part (32) is fixed on the supporting piece (1), the other end of the connecting part is connected to the outer side of the fixed ring (31), and the fixed ring (31) is sleeved on the ventilation pipe section (2);
the fixing pieces (3) are distributed on the ventilation pipe section (2) at intervals, and the reinforcing pieces (4) are distributed on the ventilation pipe section (2) at intervals.
3. A downhole ventilation pipe auxiliary laying device according to claim 2, wherein:
the connecting part (32) comprises a first supporting rod (321), a second supporting rod (322) and a third supporting rod (323);
the first supporting rod (321) is arranged above the fixed ring (31) along the vertical direction;
the second supporting rod (322) and the first supporting rod (321) are arranged above the fixed ring (31) at a first designated angle (a);
the third support rods (323) and the first support rods (321) are arranged above the fixed ring (31) at a second designated angle (b);
the first support rod (321), the second support rod (322) and the third support rod (323) are of telescopic structures, and one ends, far away from the fixed ring (31), of the first support rod (321), the second support rod (322) and the third support rod (323) are connected to the support piece (1).
4. A downhole ventilation pipe auxiliary laying apparatus according to claim 3, wherein:
the connection portion (32) further includes a mounting frame (324);
the mounting frame (324) is fixed in fixed ring (31) top, the lower extreme spiro union of first bracing piece (321) in mounting frame (324), second bracing piece (322) with one end that third bracing piece (323) are close to fixed ring (31) all articulate in on mounting frame (324).
5. A downhole ventilation pipe auxiliary laying device according to claim 2, wherein:
the reinforcement (4) comprises a support plate (41) and a lifting rod (42);
one ends of the two lifting rods (42) are respectively hinged to two ends of the supporting plate (41), the other ends of the two lifting rods (42) are connected to the supporting piece (1), and the upper surface of the supporting plate (41) is abutted to the lower part of the ventilation pipe section (2);
the two lifting rods (42) are of telescopic structure.
6. A downhole ventilation pipe auxiliary laying apparatus according to claim 1, wherein:
a plurality of the butt joint pipe sections (5) can rotate around the vertical direction relative to the ventilation pipe section (2).
7. A downhole ventilation pipe auxiliary laying apparatus according to claim 3, wherein:
the support piece (1) comprises three support bars (11) which extend in parallel, and the support bars (11) are used for being fixed on a well wall;
the first supporting rod (321) is correspondingly connected with the supporting rod (11) positioned in the middle, and the second supporting rod (322) and the third supporting rod (323) are respectively correspondingly connected with the supporting rods (11) positioned at two sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321365285.XU CN220037631U (en) | 2023-05-31 | 2023-05-31 | Auxiliary paving device for underground ventilation pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321365285.XU CN220037631U (en) | 2023-05-31 | 2023-05-31 | Auxiliary paving device for underground ventilation pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220037631U true CN220037631U (en) | 2023-11-17 |
Family
ID=88735545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321365285.XU Active CN220037631U (en) | 2023-05-31 | 2023-05-31 | Auxiliary paving device for underground ventilation pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220037631U (en) |
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2023
- 2023-05-31 CN CN202321365285.XU patent/CN220037631U/en active Active
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