CN114261775A - Bidirectional adjustable shrinkage cavity device for coal-fired unit - Google Patents
Bidirectional adjustable shrinkage cavity device for coal-fired unit Download PDFInfo
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- CN114261775A CN114261775A CN202111428007.XA CN202111428007A CN114261775A CN 114261775 A CN114261775 A CN 114261775A CN 202111428007 A CN202111428007 A CN 202111428007A CN 114261775 A CN114261775 A CN 114261775A
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 28
- 238000013016 damping Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 230000002146 bilateral effect Effects 0.000 claims abstract description 3
- 230000035939 shock Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The invention discloses a bidirectional adjustable shrinkage cavity device for a coal-fired unit, which comprises a valve body, an adjusting assembly and a moving assembly, wherein the valve body comprises a box body, an upper mounting plate and a lower mounting plate are horizontally arranged in the box body, and the upper mounting plate and the lower mounting plate divide the inner part of the box body into an upper cavity, a hollow cavity and a lower cavity; the adjusting components are arranged in the hollow cavity in a bilateral symmetry mode and comprise shrinkage plates and screw rods. The invention adjusts the position of the hole shrinkage plate by arranging the screw rod and the hand wheel, thereby achieving the purpose of reducing the hole; the hole shrinkage plate can stably move by arranging the sliding rail and the sliding rail, and the hole shrinkage plate cannot deviate in the moving process; the damping piece and the damping spring in the box body increase the overall stability of the device, and the service life can be effectively prolonged; the sealing layer makes between shrinkage cavity board and the pipeline through-hole inseparabler, avoids the edge to reveal and leads to the buggy in the pipeline to reveal through the gap.
Description
Technical Field
The invention relates to the technical field of thermal power generation coal-fired units, in particular to a bidirectional adjustable shrinkage cavity device for a coal-fired unit.
Background
In recent years, in powder feeding pipelines of coal-fired units of thermal power plants, most of primary air pipes adopt drawing and inserting type double-core adjustable shrinkage cavities, and screw rods and screw nut transmission mechanisms of the adjustable shrinkage cavities are designed in valve bodies to push shrinkage cavity plates to move towards through holes of the pipelines, so that the purpose of shrinkage cavities is achieved. Because the sealing structure of the adjustable shrinkage cavity is too simple, the pulverized coal in the pipe is easy to leak out through the gap between the inserting plate and the valve body in the process of inserting and extracting the inserting plate. However, the shrinkage cavity device in the prior art has leakage hidden trouble, and because there is certain space between the shrinkage cavity plate and the through hole, and the plate moves unstably and straightly, has a little deviation easily, leads to the gap to increase, thereby leaks from edge gap and increases, uses safe and reliable not.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The invention is provided in view of the problems of the bidirectional adjustable shrinkage cavity device for the existing coal-fired unit.
Therefore, the invention aims to provide a bidirectional adjustable shrinkage cavity device for a coal-fired unit, which aims to reduce the leakage hidden trouble of the existing device.
In order to solve the technical problems, the invention provides the following technical scheme: a bidirectional adjustable shrinkage cavity device for a coal-fired unit comprises a valve body, an adjusting assembly and a moving assembly, wherein the valve body comprises a box body, an upper mounting plate and a lower mounting plate are horizontally arranged in the box body, and the upper mounting plate and the lower mounting plate divide the inner part of the box body into an upper cavity, a hollow cavity and a lower cavity; the adjusting assemblies are symmetrically arranged in the hollow cavity in the left-right direction and comprise shrinkage plates and screw rods, the middle parts of the outer sides of the shrinkage plates are provided with connecting seats, and one ends of the screw rods are fixedly connected with the connecting seats; and the moving assembly comprises a first sliding rail, the first sliding rail is arranged on the upper surface of the lower mounting plate, a first sliding block is arranged on the first sliding rail, the first sliding block is provided with two groups, and the other end of the first sliding block is fixedly connected with the shrinkage cavity plate through a first connecting rod.
As a preferable scheme of the bidirectional adjustable shrinkage cavity device for the coal-fired unit, the invention comprises the following steps: the middle part of well cavity is provided with inlays the mouth, the front side that inlays the mouth is connected with the front pipeline interface, the rear side that inlays the mouth is connected with the back pipeline interface.
As a preferable scheme of the bidirectional adjustable shrinkage cavity device for the coal-fired unit, the invention comprises the following steps: the outer side of the screw rod is sleeved with a shaft sleeve, the shaft sleeve is fixedly connected with the outer side of the box body, and a hand wheel is arranged at one end, far away from the connecting seat, of the screw rod.
As a preferable scheme of the bidirectional adjustable shrinkage cavity device for the coal-fired unit, the invention comprises the following steps: the moving assembly further comprises a second sliding rail and a second sliding block, the second sliding block slides on the second sliding rail in a matched mode, the left side and the right side of the second sliding rail are fixedly connected with the inner wall of the box body, and the second sliding block is fixedly connected with the top end of the hole shrinkage plate through a second connecting rod.
As a preferable scheme of the bidirectional adjustable shrinkage cavity device for the coal-fired unit, the invention comprises the following steps: and a rack is arranged above the second sliding block, and the rack is fixedly connected with the second sliding block through a connecting shaft.
As a preferable scheme of the bidirectional adjustable shrinkage cavity device for the coal-fired unit, the invention comprises the following steps: a gear is meshed between the ends, close to each other, of the two racks, the gear is coplanar with the shrinkage cavity plate, and a central shaft of the gear is fixedly connected with the front inner wall and the rear inner wall of the box body.
As a preferable scheme of the bidirectional adjustable shrinkage cavity device for the coal-fired unit, the invention comprises the following steps: the shock absorbing members comprise springs and bases, the lower ends of the springs are fixedly connected with the upper ends of the bases, the upper ends of the springs are fixedly connected with the inner wall of the upper side of the box body, and the lower ends of the bases are fixedly connected with the upper surface of the upper mounting plate.
As a preferable scheme of the bidirectional adjustable shrinkage cavity device for the coal-fired unit, the invention comprises the following steps: and a plurality of groups of damping springs are arranged in the lower cavity, the lower ends of the damping springs are fixedly connected with the inner wall of the lower side of the box body, and the upper ends of the damping springs are fixedly connected with the lower surface of the lower mounting plate.
As a preferable scheme of the bidirectional adjustable shrinkage cavity device for the coal-fired unit, the invention comprises the following steps: the upper end of the box body is further provided with a cover plate, and the cover plate is fixedly connected with the upper plate surface of the box body through bolts.
As a preferable scheme of the bidirectional adjustable shrinkage cavity device for the coal-fired unit, the invention comprises the following steps: the shrinkage hole plate is semicircular, sealing layers are arranged on the front side and the rear side of the shrinkage hole plate, and the sealing layers are made of rubber.
The invention has the beneficial effects that:
the invention adjusts the position of the hole shrinkage plate by arranging the screw rod and the hand wheel, thereby achieving the purpose of reducing the hole; the hole shrinkage plate can stably move by arranging the sliding rail and the sliding rail, and the hole shrinkage plate cannot deviate in the moving process; the damping piece and the damping spring in the box body increase the overall stability of the device, and the service life can be effectively prolonged; the sealing layer makes between shrinkage cavity board and the pipeline through-hole inseparabler, avoids the edge to reveal and leads to the buggy in the pipeline to reveal through the gap.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced 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 based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic view of the overall structure of a bidirectional adjustable shrinkage cavity device for a coal-fired unit according to the present invention.
Fig. 2 is a top view of the bi-directional adjustable shrinkage cavity device for a coal burning unit of the present invention.
FIG. 3 is a schematic cross-sectional view of a bi-directional adjustable shrinkage cavity apparatus for a coal burning unit of the present invention.
FIG. 4 is a schematic sectional internal view of a bi-directional adjustable shrinkage cavity apparatus for a coal burning unit according to the present invention.
Fig. 5 is an enlarged schematic view of a portion a in fig. 4.
Fig. 6 is a schematic structural diagram of the moving components of the bidirectional adjustable shrinkage cavity device for the coal-fired unit.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Furthermore, the present invention is described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, the cross-sectional view illustrating the structure of the device is not enlarged partially according to the general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Example 1
Referring to fig. 1 to 6, for a first embodiment of the present invention, a bidirectional adjustable shrinkage cavity device for a coal-fired unit is provided, the device includes a valve body 100, including a box body 101, an upper mounting plate 102 and a lower mounting plate 103 are horizontally arranged inside the box body 101, and the upper mounting plate 102 and the lower mounting plate 103 divide the inside of the box body 101 into an upper cavity 101a, a hollow cavity 101b and a lower cavity 101 c; the adjusting assembly 200 is arranged in the hollow cavity 101b in a bilateral symmetry manner and comprises a hole shrinkage plate 201 and a screw rod 202, a connecting seat 203 is arranged in the middle of the outer side of the hole shrinkage plate 201, and one end of the screw rod 202 is fixedly connected with the connecting seat 203; and the moving assembly 300 comprises a first slide rail 301, the first slide rail 301 is arranged on the upper surface of the lower mounting plate 103, a first slide block 302 is arranged on the first slide rail 301, the first slide blocks 302 are provided with two groups, and the other ends of the first slide blocks are fixedly connected with the shrinkage cavity plate 201 through a first connecting rod 303.
Furthermore, an embedding opening 101b-1 is arranged in the middle of the hollow cavity 101b, the front side of the embedding opening 101b-1 is connected with a front pipeline interface 101b-2, and the rear side of the embedding opening 101b-1 is connected with a rear pipeline interface 101b-3
The adjusting assembly 200 is mainly used for adjusting a hole, the moving assembly 300 is used for controlling the hole-reducing degree of the adjusting assembly 200, and the hole-reducing plate 201 moves forwards and backwards through the cooperation of the first sliding rail 301 and the first sliding block 302, so that the hole is reduced; by controlling the screw rod 202, the screw rod 202 drives the shrinkage board 201 to move.
In the use process, the air supply pipeline of the coal-fired unit is respectively communicated with the front pipeline connector 101b-1 and the rear pipeline connector 101b-3, when the diameter reduction needs to be adjusted, the screw rod 202 is rotated, and the screw rod 202 drives the two hole reducing plates 201 to move oppositely, so that the aperture is reduced.
Example 2
Referring to fig. 1 to 6, a second embodiment of the present invention is different from the first embodiment in that: a shaft sleeve 204 is sleeved on the outer side of the screw rod 202, the shaft sleeve 204 is fixedly connected with the outer side of the box body 101, and a hand wheel 205 is arranged at one end, away from the connecting seat 203, of the screw rod 202. The moving assembly 300 further comprises a second sliding rail 304 and a second sliding block 305, the second sliding block 305 is matched and slides on the second sliding rail 304, the left side and the right side of the second sliding rail 304 are fixedly connected with the inner wall of the box body 101, and the second sliding block 305 is fixedly connected with the top end of the shrinkage cavity plate 201 through a second connecting rod 306.
Compared with the embodiment 1, further, a rack 307 is arranged above the second sliding block 305, and the rack 307 and the second sliding block 305 are fixedly connected through a connecting shaft 308; a gear 309 is meshed between the opposite ends of the two racks 307, the gear 309 is coplanar with the shrinkage cavity plate 201, and the central shaft of the gear 309 is fixedly connected with the front inner wall and the rear inner wall of the box body 101.
The rest of the structure is the same as that of embodiment 1.
Specifically, the first slide rail 301 and the second slide rail 304 are parallel to each other, so as to ensure that the shrinkage board 201 does not deviate during movement; the handwheel 205 is used for driving the screw rod 202 to rotate when rotating, and the screw rod 202 advances and retreats in the inner screw of the shaft sleeve 204, thereby pushing the shrinkage board 201 to advance and retreat and adjusting the aperture size. The gear 309 and the rack 307 are matched with each other, so that the two shrinkage plates 201 can synchronously move inwards or outwards only by rotating the hand wheel 205 on one side, and when the gear 309 or the rack 307 fails, the two hand wheels 205 can also be respectively rotated.
In the use process, when the aperture needs to be adjusted, the hand wheel 205 on one side is rotated, the hand wheel 205 drives the screw rod 202 to spirally advance and retreat, the screw rod 202 pushes the hole shrinkage plate 201 to advance and retreat, and the upper end and the lower end of the hole shrinkage plate 201 slide on the second slide rail 304 and the first slide rail 301 through the second slide block 305 and the first slide block 302 respectively; the first slide block 302 on one side of the rotated handwheel 205 drives the rack 307 on the side to move forward and backward, the rack 307 drives the gear 309 to rotate, and the gear 309 drives the rack 307 on the other side to move forward and backward, so that the other orifice plate 201 is driven to move forward and backward together, that is, the handwheel 205 on any side is rotated, so that the two orifice plates 201 can be driven to move forward and backward simultaneously. When the gear 309 and the rack 307 are damaged or failed, the two handwheels 305 can be directly rotated to control the movement of the orifice plate 201.
Example 3
Referring to fig. 1 to 6, a third embodiment of the present invention is different from the second embodiment in that: a plurality of groups of shock absorbing pieces 101a-1 are arranged in the upper cavity 101a, each shock absorbing piece 101a-1 comprises a spring 101a-1a and a base 101a-1b, the lower end of each spring 101a-1a is fixedly connected with the upper end of each base 101a-1b, the upper end of each spring 101a-1a is fixedly connected with the inner wall of the upper side of the box body 101, and the lower end of each base 101a-1b is fixedly connected with the upper surface of the upper mounting plate 102. A plurality of groups of damping springs 101c-1 are arranged in the lower cavity 101c, the lower ends of the plurality of groups of damping springs 101c-1 are fixedly connected with the inner wall of the lower side of the box body 101, and the upper ends of the plurality of groups of damping springs 101c-1 are fixedly connected with the lower surface of the lower mounting plate 103.
Compared with the embodiment 2, the upper end of the box 101 is further provided with a cover plate 104, and the cover plate 104 is fixedly connected with the upper plate surface of the box 101 through bolts. The shrinkage cavity plate 201 is semicircular, sealing layers 201a are arranged on the front side and the rear side of the shrinkage cavity plate, and the sealing layers 201a are made of rubber.
The rest of the structure is the same as that of embodiment 2.
Specifically, the damping member 101a-1 and the damping spring 101c-1 are used for elastic damping, so that the valve body 100 is protected more conveniently, and the service life of the device is prolonged. The sealing layer 201a enables the shrinkage cavity plate 201 and the pipeline through hole to be closer, and avoids leakage of coal dust in the pipeline caused by edge leakage through gaps.
In the use process, the hand wheel 205 is rotated, the shrinkage cavity plate 201 is driven to move under the action of the screw rod 202, the first slide rail 301, the first slide block 302, the second slide block 305, the second slide rail 304, the gear 309 and the rack 307, the two shrinkage cavity plates 201 can be spliced into a whole circle, the caulking port 101b-1 can be just blocked, and the pipeline is sealed; the first slide rail 301 and the second slide rail 304 ensure that the shrinkage board 201 moves along a straight line, and a gap between the shrinkage board 201 and a through hole is avoided.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a two-way adjustable shrinkage cavity device that coal-fired unit used which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the valve body (100) comprises a box body (101), an upper mounting plate (102) and a lower mounting plate (103) are horizontally arranged in the box body (101), and the upper mounting plate (102) and the lower mounting plate (103) divide the interior of the box body (101) into an upper cavity (101a), a hollow cavity (101b) and a lower cavity (101 c);
the adjusting assembly (200) is arranged in the hollow cavity (101b) in a bilateral symmetry mode and comprises a hole shrinkage plate (201) and a screw rod (202), a connecting seat (203) is arranged in the middle of the outer side of the hole shrinkage plate (201), and one end of the screw rod (202) is fixedly connected with the connecting seat (203); and the number of the first and second groups,
motion subassembly (300), including first slide rail (301), first slide rail (301) set up in the upper surface of lower mounting panel (103), install first slider (302) on first slide rail (301), first slider (301) are provided with two sets ofly, its other end through first connecting rod (303) with shrink-hole board (201) fixed connection.
2. The bidirectional adjustable shrinkage cavity device for the coal-fired unit according to claim 1, wherein: the middle of the hollow cavity (101b) is provided with an embedding opening (101b-1), the front side of the embedding opening (101b-1) is connected with a front pipeline interface (101b-2), and the rear side of the embedding opening (101b-1) is connected with a rear pipeline interface (101 b-3).
3. The bidirectional adjustable shrinkage cavity device for the coal-fired unit according to claim 2, wherein: the outer side of the screw rod (202) is sleeved with a shaft sleeve (204), the shaft sleeve (204) is fixedly connected with the outer side of the box body (101), and a hand wheel (205) is arranged at one end, far away from the connecting seat (203), of the screw rod (202).
4. The bidirectional adjustable shrinkage cavity device for the coal-fired unit according to claim 3, wherein: the moving assembly (300) further comprises a second sliding rail (304) and a second sliding block (305), the second sliding block (305) slides on the second sliding rail (304) in a matched mode, the left side and the right side of the second sliding rail (304) are fixedly connected with the inner wall of the box body (101), and the second sliding block (305) is fixedly connected with the top end of the shrinkage cavity plate (201) through a second connecting rod (306).
5. The bidirectional adjustable shrinkage cavity device for the coal-fired unit according to claim 4, wherein: a rack (307) is arranged above the second sliding block (305), and the rack (307) is fixedly connected with the second sliding block (305) through a connecting shaft (308).
6. The bidirectional adjustable shrinkage cavity device for the coal-fired unit according to claim 5, wherein: a gear (309) is meshed between the ends, close to each other, of the two racks (307), the gear (309) is coplanar with the shrinkage plate (201), and the central shaft of the gear (309) is fixedly connected with the front inner wall and the rear inner wall of the box body (101).
7. The bidirectional adjustable shrinkage cavity device for the coal-fired unit according to any one of claims 1 to 6, characterized in that: a plurality of groups of shock absorbing pieces (101a-1) are arranged in the upper cavity (101a), each shock absorbing piece (101a-1) comprises a spring (101a-1a) and a base (101a-1b), the lower end of each spring (101a-1a) is fixedly connected with the upper end of each base (101a-1b), the upper end of each spring (101a-1a) is fixedly connected with the inner wall of the upper side of the box body (101), and the lower end of each base (101a-1b) is fixedly connected with the upper surface of the upper mounting plate (102).
8. The bidirectional adjustable shrinkage cavity device for the coal-fired unit according to claim 7, wherein: a plurality of groups of damping springs (101c-1) are arranged in the lower cavity (101c), the lower ends of the plurality of groups of damping springs (101c-1) are fixedly connected with the inner wall of the lower side of the box body (101), and the upper ends of the plurality of groups of damping springs (101c-1) are fixedly connected with the lower surface of the lower mounting plate (103).
9. The bidirectional adjustable shrinkage cavity device for the coal-fired unit according to any one of claims 1 to 6 and 8, characterized in that: the upper end of the box body (101) is further provided with a cover plate (104), and the cover plate (104) is fixedly connected with the upper plate surface of the box body (101) through bolts.
10. The bidirectional adjustable shrinkage cavity device for the coal-fired unit according to claim 9, wherein: the hole shrinkage plate (201) is semicircular, sealing layers (201a) are arranged on the front side and the rear side of the hole shrinkage plate, and the sealing layers (201a) are made of rubber.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111428007.XA CN114261775B (en) | 2021-11-26 | 2021-11-26 | Bidirectional adjustable shrinkage cavity device for coal-fired unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111428007.XA CN114261775B (en) | 2021-11-26 | 2021-11-26 | Bidirectional adjustable shrinkage cavity device for coal-fired unit |
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| CN212775663U (en) * | 2020-04-21 | 2021-03-23 | 大唐长山热电厂 | Shrinkage cavity driving medium that boiler coal pulverizer export is adjustable |
| CN113305141A (en) * | 2021-05-25 | 2021-08-27 | 南京金乾盛建设工程有限公司 | High-pressure jet grouting injection in-situ repair system and method |
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