CN213953560U - Simple construction device for sealing inclined large-diameter drill hole of coal mine - Google Patents
Simple construction device for sealing inclined large-diameter drill hole of coal mine Download PDFInfo
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- CN213953560U CN213953560U CN202023212301.0U CN202023212301U CN213953560U CN 213953560 U CN213953560 U CN 213953560U CN 202023212301 U CN202023212301 U CN 202023212301U CN 213953560 U CN213953560 U CN 213953560U
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Abstract
The simple construction device for sealing the inclined large-diameter drill hole of the coal mine comprises a hole sealing device, a single-bag and a grouting pipe which are all arranged in the inclined large-diameter drill hole, wherein the outlet end of the grouting pipe is connected with the single-bag, an explosion valve is arranged on the grouting pipe, and the inlet end of the grouting pipe is provided with a grouting valve positioned outside the orifice of the inclined large-diameter drill hole; the hole sealing device comprises a disc, a grouting perforation parallel to the first threaded hole is formed in the eccentric position of the disc, and a grouting pipe penetrates through the grouting perforation. The utility model discloses convenient operation, hole sealing device in the major diameter drilling internal fixation of slope firm and can carry out quick sealed drilling and carry out the slip casting operation, can solve grouting material, waste rock, ponding and get into the problem in tunnel easily after the slip casting is accomplished, and the practicality is strong, has important spreading value.
Description
Technical Field
The utility model belongs to the technical field of colliery gas drainage drilling hole sealing, concretely relates to colliery slope major diameter drilling seals and uses simple and easy construction equipment.
Background
The inclined large-diameter drill hole is a new goaf gas extraction technology developed in recent years, as shown in fig. 1 and fig. 2, an air inlet lane 49 and an air return lane 51 are respectively arranged on two sides of a coal face 50, namely, a gas control lane 52 is arranged beside the air return lane 51 at the coal face 50, an inclined large-diameter drill hole 53 is drilled from the gas control lane 52 to the air return lane 51, the inclined large-diameter drill hole 53 replaces a connecting lane of the air return lane 51 to extract upper corner gas, 54 in fig. 2 is a goaf, 55 is a coal pillar, 56 is a coal seam, and 57 is a gas extraction pipeline.
In recent years, inclined large-diameter drill holes are applied to a certain degree for extracting gas in a goaf. The literature: the technology for treating upper corner gas in ultra-large diameter drilling holes by replacing the lane with holes (Jiang Lian, Yangbang, Shanxi coking coal technology, 2019: 47-49), the feasibility research of gas extraction technology in small Zhuang mine by replacing the lane with holes (Guo Lin, Lin build, Like, and the like, Chinese coal, 2020, 46(9): 65-70), the research of the technology for treating upper corner gas in ultra-large diameter drilling holes (Wang Kangwang, mining industry safety and environmental protection, 2020, 47(2): 90-93), the application of the technology for treating upper corner gas in large diameter drilling holes on comprehensive mining working faces (Shiruing, Gao, Lihao, Shanxi coking coal technology, 2018: 31-34), the research of the gas extraction technology in ultra-large diameter drilling hole mining area (Gaowang, Yang Wei, scientific technology, 2019, 47(2): 77-81), and the application research of the large diameter gas extraction technology in Wanan coal mining area (Wan Lian coal and chemical industry, 2019.42(5): 100-103) etc. describe the use of inclined large diameter boreholes in coal mines.
The sealing of the inclined large-diameter drill hole is different from the sealing purpose of a common drill hole, and the sealing purpose of the common drill hole is to prevent air from entering the drill hole and improve the gas extraction concentration and effect; after the gas extraction pipeline 57 is removed, the inclined large-diameter drill hole is sealed so as to plug the large-diameter drill hole and prevent waste rock and accumulated water in the goaf from entering the roadway through the inclined large-diameter drill hole.
The inclined large-diameter drill hole has a certain inclination angle and needs more hole sealing materials. In the sealing process, the sealing grouting material is easy to slide out along the inclined large-diameter drill hole. How to quickly and efficiently seal the inclined large-diameter drill hole becomes the key for popularizing the technology of extracting gas in the goaf by the inclined large-diameter drill hole.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the problem of slope major diameter drilling roll-off that the grouting material is easy along slope major diameter drilling roll-off in the slope major diameter drilling sealing process, provide colliery slope major diameter drilling and seal and use simple and easy construction equipment, can seal slope major diameter drilling fast, prevent that collecting space area waste rock, ponding from entering into the tunnel through slope major diameter drilling.
In order to solve the technical problem, the utility model adopts the following technical scheme: the simple construction device for sealing the inclined large-diameter drill hole of the coal mine comprises a hole sealing device, a single-bag and a grouting pipe which are all arranged in the inclined large-diameter drill hole, wherein the outlet end of the grouting pipe is connected with the single-bag, an explosion valve is arranged on the grouting pipe, and the inlet end of the grouting pipe is provided with a grouting valve positioned outside the orifice of the inclined large-diameter drill hole;
the hole sealing device includes the disc, the connecting rod, the cross expansion bracket, outer annular gasbag, first screw hole has been seted up at the disc center, connecting rod one end stretches into and threaded connection is in first screw hole, the connecting rod other end and the center fixed connection of department of cross expansion bracket, the plane at cross expansion bracket place is parallel with the disc, outer annular groove has been seted up along the circumferencial direction to the excircle of disc, outer annular gasbag is installed at outer annular inslot, the slip casting perforation parallel with first screw hole is seted up to the eccentric department of disc, the slip casting pipe is worn to establish in the slip casting perforation.
An inner annular groove is formed in the inner circle of the grouting perforation, and an inner annular air bag sleeved on the grouting pipe is arranged in the inner annular groove;
the air inlet of interior annular gasbag is connected through a three-way pipe with outer annular gasbag's air inlet, the third interface connection of three-way pipe has the gas injection pipe, be equipped with the outer gas injection valve that closes on outer annular gasbag air inlet on the three-way pipe, be equipped with the interior gas injection valve that closes on inner annular gasbag air inlet on the three-way pipe, be equipped with outer manometer between outer gas injection valve and outer annular gasbag air inlet on the three-way pipe, manometer in being equipped with between interior gas injection valve and inner annular gasbag air inlet on the three-way pipe, be equipped with interior exhaust valve on the inner annular gasbag, be equipped with outer exhaust valve on the outer annular gasbag, the three-way pipe, interior exhaust valve and outer exhaust valve all are located the disc side that closes on the cross expansion bracket.
The cross expansion bracket comprises a center connecting block and four fixing rods, a second threaded hole is formed in one side face, opposite to the disc, of the center connecting block, the end portion of each connecting rod stretches into the center connecting block and is in threaded connection with the end portion of each connecting rod, the inner ends of the four fixing rods are fixedly connected to the periphery of the center connecting block, the four fixing rods form a cross shape, the plane where the four fixing rods are located is perpendicular to the connecting rods, a sleeve is in threaded connection with the outer end portion of each fixing rod, the outer end of the sleeve is blocked and is set to be of a sharp structure, and the periphery of the sleeve is of a regular hexagonal prism structure matched with a wrench bayonet.
Adopt above-mentioned technical scheme, use the utility model discloses carry out the concrete process that seals the construction operation to slope major diameter drilling, including following step:
(1) assembling a hole sealing device;
(2) placing the single-bag and the grouting pipe into the inclined large-diameter drill hole, wherein the outlet end of the grouting pipe is connected with the single-bag, the grouting pipe is provided with a blasting valve, and the inlet end of the grouting pipe is provided with a grouting valve positioned outside the orifice of the inclined large-diameter drill hole;
(3) placing a hole sealing device in the inclined large-diameter drill hole along the grouting pipe;
(4) fixedly connecting the hole sealing device with the hole wall of the inclined large-diameter drill hole;
(5) the hole sealing device is connected with an air injection pump through an air injection pipe, and the air injection pump is started to expand the hole sealing device to seal the inclined large-diameter drill hole;
(6) the inlet end of the grouting pipe is connected with a grouting pump, and the grouting pump is started to perform grouting in the single-bag and the inclined large-diameter drill hole between the single-bag and the hole sealing device through the grouting pipe;
(7) after grouting for 24 hours, solidifying the slurry; and (5) removing the hole sealing device.
The step (1) is specifically as follows: respectively connecting a fixed rod of the cross telescopic frame with the four sleeves in a threaded manner; connecting a central connecting block of the cross telescopic frame with one end of a connecting rod; connecting the connecting rod with the first threaded hole of the disc; and respectively fixing an outer annular air bag and an inner annular air bag which are connected through a three-way pipe in an outer annular groove on the circumference of the disc and an inner annular groove on the inner circle of the grouting through hole.
The step (2) is specifically as follows: in the inclined large-diameter drill hole, the disc is positioned above the inner side of the cross expansion bracket, and the connecting rod is parallel to the central line of the inclined large-diameter drill hole.
The step (3) is specifically as follows: and (3) extending the grouting pipe from the orifice of the inclined large-diameter drill hole to the upper part of the inner side of the disc through the grouting through hole on the disc.
The step (4) is specifically as follows: the method comprises the steps of firstly extending the sharp structures at the outer ends of the four sleeves into an inclined large-diameter drill hole by hands, respectively rotating the four sleeves to enable the sharp structures at the outer ends of the four sleeves to prop against the hole wall of the drill hole, then using a wrench to clamp the regular hexagonal prism structures outside the sleeves, and then further wedging the sharp structures of the sleeves into the hole wall to fix the hole sealing device.
The step (5) is specifically as follows: connecting a third interface of the three-way pipe with an air injection pump through an air injection pipe, opening an outer air injection valve on the three-way pipe, closing the inner air injection valve, and starting the air injection pump to inject air into the outer annular air bag; the excircle of the outer annular air bag expands and is pressed and sealed with the inner wall of the inclined large-diameter drill hole, and when the reading of an outer pressure gauge is 0.3MPa, the air injection pump is closed to stop injecting air; and then closing the outer air injection valve, opening the inner air injection valve, starting the air injection pump, injecting air into the inner annular air bag, pressing and sealing the inner circle of the inner annular air bag and the outer circle of the grouting pipe, closing the air injection pump to stop injecting air when the reading of the inner pressure gauge is 0.2MPa, and then closing the inner air injection valve.
The concrete grouting process in the step (6) comprises the following steps: the grouting method comprises the steps of firstly connecting a grout outlet of a grouting pump with an inlet end of a grouting pipe through a quick connector, opening a grouting valve, injecting grout into the inner part of a single bag through the grouting pipe by the grouting pump, plugging inclined large-diameter drilled holes by expansion of the single bag, forming a grouting hole sealing section between the single bag and a disc at the moment, opening a blasting valve when grouting pressure is larger than 1.2MPa, grouting grout into the grouting hole sealing section until the grouting hole sealing section is filled with the grout, closing the grouting valve, and separating the quick connector from the inlet end of the grouting pipe.
The concrete process of removing the hole sealing device in the step (7) is as follows: firstly, opening an inner exhaust valve on the inner annular air bag to deflate the inner annular air bag; then the outer air bag is deflated through an outer air exhaust valve on the outer air bag; then, the sleeve is rotated by a wrench, and the sharp structure at the outer end of the sleeve is retracted from the coal seam on the inner wall of the inclined large-diameter drill hole; and finally, the whole hole sealing device is drawn out to the outside of the inclined large-diameter drill hole along the grouting pipe, and the grouting pipe is left in the inclined large-diameter drill hole.
The disc in the utility model adopts toughened glass, and the grouting condition in the drill hole can be observed through the disc; the outer circle of the disc is provided with an outer annular groove, so that an outer annular air bag for fixedly installing the outer annular air bag is easier to fix; be equipped with the slip casting perforation on the disc, the fenestrate inner wall of slip casting sets up the inner ring groove that is used for annular gasbag in the fixed mounting, and outer annular gasbag is fixed at the disc periphery, and the main function is the space between sealed disc and the slope major diameter drilling inner wall, and the annular gasbag main function in the interior is the space between sealed slip casting pipe and the slip casting perforation. Through the setting of interior annular gasbag and outer annular gasbag for hole sealing device will incline major diameter drilling shutoff tight, and the thick liquid can not reveal to the drill way when ensureing the slip casting.
The cross expansion bracket is connected with the fixed rod through the four sleeves in a threaded manner, and the sleeves are screwed to be pricked into the hole wall of the inclined large-diameter drill hole, so that the axial position of the disc can be limited, and the stability of the disc during sealed drilling can be ensured.
To sum up, the utility model discloses the principle science, simple structure, convenient operation, hole sealing device in the major diameter drilling internal fixation of slope firm and can carry out the quick drilling that seals and carry out the slip casting operation, can solve grouting material, waste rock, ponding after the slip casting is accomplished and get into the problem in tunnel easily, the practicality is strong, has important spreading value.
Drawings
FIG. 1 is a plan view of an inclined large diameter borehole;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
fig. 3 is a schematic structural view of the present invention in an operating state;
FIG. 4 is a schematic perspective view of the hole sealing device of FIG. 3;
FIG. 5 is a cross-sectional view of the disc, inner annular bladder and outer annular bladder;
fig. 6 is an enlarged view at B in fig. 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 3-6, the utility model discloses a colliery slope major diameter drilling seals uses simple and easy construction equipment, including all setting up hole sealing device 1, single bag 7 and slip casting pipe 3 in slope major diameter drilling 2, the exit end and the single bag 7 of slip casting pipe 3 are connected, are provided with explosion valve 22 on the slip casting pipe 3, and the entrance point of slip casting pipe 3 is equipped with the slip casting valve 23 that is located outside the 2 drill mouths of slope major diameter drilling.
An inner ring-shaped groove is formed in the inner circle of the grouting perforation 10, and an inner ring-shaped air bag 11 sleeved on the grouting pipe 3 is arranged in the inner ring-shaped groove;
the air inlet of interior annular gasbag 11 is connected through a three-way pipe 12 with outer annular gasbag 8's air inlet, the third interface connection of three-way pipe 12 has the gas injection pipe, be equipped with the outer gas injection valve 13 that closes on outer annular gasbag 8 air inlet on the three-way pipe 12, be equipped with the interior gas injection valve 14 that closes on inner annular gasbag 11 air inlet on the three-way pipe 12, be equipped with outer manometer 15 between outer gas injection valve 13 and outer annular gasbag 8 air inlet on the three-way pipe 12, be equipped with interior manometer 16 between interior gas injection valve 14 and inner annular gasbag 11 air inlet on the three-way pipe 12, be equipped with interior exhaust valve 17 on the inner annular gasbag 11, be equipped with outer exhaust valve 18 on the outer annular gasbag, the three-way pipe 12, interior exhaust valve 17 and outer exhaust valve 18 all are located and close on the 5 sides of disc of cross expansion bracket.
The cross expansion bracket comprises a central connecting block 19 and four fixing rods 20, a second threaded hole is formed in one side face, opposite to the disc 5, of the central connecting block 19, the end portion of the connecting rod 6 stretches into the central connecting block 19 and is in threaded connection with the second threaded hole, the inner ends of the four fixing rods 20 are fixedly connected to the periphery of the central connecting block 19, the four fixing rods 20 form a cross shape, the plane where the four fixing rods 20 are located is perpendicular to the connecting rod 6, the outer end of each fixing rod 20 is in threaded connection with a sleeve 21, the outer end of each sleeve 21 is blocked and arranged to be of a sharp-pointed structure, and the periphery of each sleeve 21 is of a regular hexagonal prism structure matched with a wrench bayonet.
Use the utility model discloses carry out the concrete process that seals the construction operation to slope major diameter drilling, including following step:
(1) assembling the hole sealing device 1;
(2) placing a single-bag 7 and a grouting pipe 3 into the inclined large-diameter drill hole 2, wherein the outlet end of the grouting pipe 3 is connected with the single-bag 7, the grouting pipe 3 is provided with a blasting valve 22, and the inlet end of the grouting pipe 3 is provided with a grouting valve 23 positioned outside the orifice of the inclined large-diameter drill hole;
(3) placing the hole sealing device 1 in the inclined large-diameter borehole 2 along the grouting pipe 3;
(4) fixedly connecting the hole sealing device 1 with the hole wall of the inclined large-diameter drill hole 2;
(5) the hole sealing device 1 is connected with an air injection pump through an air injection pipe, and the air injection pump is started to expand the hole sealing device 1 to seal the inclined large-diameter drill hole 2;
(6) the inlet end of the grouting pipe 3 is connected with a grouting pump 4, and the grouting pump 4 is started to perform grouting towards the single-bag 7 and the inclined large-diameter drill hole 2 between the single-bag 7 and the hole sealing device 1 through the grouting pipe 3;
(7) after grouting for 24 hours, solidifying the slurry; and (5) removing the hole sealing device 1.
The step (1) is specifically as follows: the fixed rod 20 of the cross telescopic frame is respectively in threaded connection with four sleeves 21; connecting a central connecting block 19 of the cross telescopic frame with one end of a connecting rod 6; connecting the connecting rod 6 with the first threaded hole 9 of the disc 5; an outer annular air bag 8 and an inner annular air bag 11 which are connected through a three-way pipe 12 are respectively fixed in an outer annular groove on the circumference of the disc 5 and an inner annular groove on the inner circle of the grouting perforation 10.
The step (2) is specifically as follows: in the inclined large-diameter bore 2, a disc 5 is located above the inside of the cross-shaped telescopic frame, and a connecting rod 6 is parallel to the center line of the inclined large-diameter bore 2.
The step (3) is specifically as follows: the grouting pipe 3 is extended from the opening of the inclined large-diameter drill 2 through the grouting penetration hole 10 on the disc 5 to the upper side of the inner side of the disc 5.
The step (4) is specifically as follows: firstly, the four sleeves 21 are respectively rotated by extending into the inclined large-diameter drill hole 2 by hands, so that the sharp structures at the outer ends of the four sleeves 21 are jacked to the hole wall of the drill hole, then the regular hexagonal prism structures outside the sleeves 21 are clamped by using a wrench, and then the sharp structures of the sleeves 21 are further wedged into the hole wall, so that the hole sealing device 1 is fixed.
The step (5) is specifically as follows: connecting a third interface of the three-way pipe 12 with an air injection pump through an air injection pipe, opening an outer air injection valve 13 on the three-way pipe 12, closing an inner air injection valve 14, and starting the air injection pump to inject air into the outer annular air bag 8; the excircle of the outer annular air bag 8 expands and is pressed and sealed with the inner wall of the inclined large-diameter drill hole 2, and when the reading of an outer pressure gauge 15 is 0.3MPa, the air injection pump is closed to stop injecting air; and then closing the outer air injection valve 13, opening the inner air injection valve 14, starting the air injection pump, injecting air into the inner annular air bag 11, pressing and sealing the inner circle of the inner annular air bag 11 and the outer circle of the grouting pipe 3, closing the air injection pump to stop injecting air when the reading of the inner pressure gauge 16 is 0.2MPa, and then closing the inner air injection valve 14. Since the inner wall of the inclined large-diameter bore 2 is not smooth, the outer annular bladder 8 is set to a pressure greater than that of the inner annular bladder 11.
The concrete grouting process in the step (6) comprises the following steps: the grouting method comprises the steps that a grout outlet of a grouting pump 4 is connected with an inlet end of a grouting pipe 3 through a quick connector 24, a grouting valve 23 is opened, the grouting pump 4 injects grout into a single-bag 7 through the grouting pipe 3, the single-bag 7 expands to plug a large-diameter inclined drill hole 2, a grouting hole sealing section is formed between the single-bag 7 and a disc 5 at the moment, when the grouting pressure is larger than 1.2MPa, a blasting valve 22 is opened, the grout is injected into the grouting hole sealing section, the grouting valve 23 is closed until the inside of the grouting hole sealing section is full of grout, and the quick connector 24 is separated from the inlet end of the grouting pipe 3.
The concrete process of removing the hole sealing device 1 in the step (7) is as follows: firstly, an inner exhaust valve 17 on the inner annular air bag 11 is opened to deflate the inner annular air bag 11; the outer annular air bag 8 is deflated through an outer air exhaust valve 18 on the outer annular air bag 8; then the sleeve 21 is rotated by a wrench, and the sharp structure at the outer end of the sleeve 21 is retracted from the coal seam on the inner wall of the inclined large-diameter drill hole 2; finally, the whole hole sealing device 1 is drawn out to the outside of the inclined large-diameter drill hole 2 along the grouting pipe 3, and the grouting pipe 3 is left in the inclined large-diameter drill hole 2; if the occupied space is reduced during storage, the disc 5, the connecting rod 6, the cross expansion bracket and the sleeve 21 are sequentially disassembled.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any form, and all of the technical matters of the present invention belong to the protection scope of the present invention to any simple modification, equivalent change and modification made by the above embodiments.
Claims (3)
1. Colliery slope major diameter drilling seals uses simple and easy construction equipment, its characterized in that: the hole sealing device, the single-bag and the grouting pipe are all arranged in the inclined large-diameter drill hole, the outlet end of the grouting pipe is connected with the single-bag, the grouting pipe is provided with an explosion valve, and the inlet end of the grouting pipe is provided with a grouting valve outside the orifice of the inclined large-diameter drill hole;
the hole sealing device includes the disc, the connecting rod, the cross expansion bracket, outer annular gasbag, first screw hole has been seted up at the disc center, connecting rod one end stretches into and threaded connection is in first screw hole, the connecting rod other end and the center fixed connection of department of cross expansion bracket, the plane at cross expansion bracket place is parallel with the disc, outer annular groove has been seted up along the circumferencial direction to the excircle of disc, outer annular gasbag is installed at outer annular inslot, the slip casting perforation parallel with first screw hole is seted up to the eccentric department of disc, the slip casting pipe is worn to establish in the slip casting perforation.
2. The simple construction device for closing the inclined large-diameter drill hole in the coal mine according to claim 1, wherein: an inner annular groove is formed in the inner circle of the grouting perforation, and an inner annular air bag sleeved on the grouting pipe is arranged in the inner annular groove;
the air inlet of interior annular gasbag is connected through a three-way pipe with outer annular gasbag's air inlet, the third interface connection of three-way pipe has the gas injection pipe, be equipped with the outer gas injection valve that closes on outer annular gasbag air inlet on the three-way pipe, be equipped with the interior gas injection valve that closes on inner annular gasbag air inlet on the three-way pipe, be equipped with outer manometer between outer gas injection valve and outer annular gasbag air inlet on the three-way pipe, manometer in being equipped with between interior gas injection valve and inner annular gasbag air inlet on the three-way pipe, be equipped with interior exhaust valve on the inner annular gasbag, be equipped with outer exhaust valve on the outer annular gasbag, the three-way pipe, interior exhaust valve and outer exhaust valve all are located the disc side that closes on the cross expansion bracket.
3. The simple construction device for closing the inclined large-diameter drill hole in the coal mine according to claim 1 or 2, wherein: the cross expansion bracket comprises a center connecting block and four fixing rods, a second threaded hole is formed in one side face, opposite to the disc, of the center connecting block, the end portion of each connecting rod stretches into the center connecting block and is in threaded connection with the end portion of each connecting rod, the inner ends of the four fixing rods are fixedly connected to the periphery of the center connecting block, the four fixing rods form a cross shape, the plane where the four fixing rods are located is perpendicular to the connecting rods, a sleeve is in threaded connection with the outer end portion of each fixing rod, the outer end of the sleeve is blocked and is set to be of a sharp structure, and the periphery of the sleeve is of a regular hexagonal prism structure matched with a wrench bayonet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023212301.0U CN213953560U (en) | 2020-12-28 | 2020-12-28 | Simple construction device for sealing inclined large-diameter drill hole of coal mine |
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| CN202023212301.0U CN213953560U (en) | 2020-12-28 | 2020-12-28 | Simple construction device for sealing inclined large-diameter drill hole of coal mine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320413A (en) * | 2021-11-26 | 2022-04-12 | 淮北矿业股份有限公司 | A high pressure resistant accurate location hole sealing device for slip casting stock |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320413A (en) * | 2021-11-26 | 2022-04-12 | 淮北矿业股份有限公司 | A high pressure resistant accurate location hole sealing device for slip casting stock |
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