CN215672220U - Colliery extra-long inclined shaft TBM construction transportation belt safety device - Google Patents
Colliery extra-long inclined shaft TBM construction transportation belt safety device Download PDFInfo
- Publication number
- CN215672220U CN215672220U CN202121446148.XU CN202121446148U CN215672220U CN 215672220 U CN215672220 U CN 215672220U CN 202121446148 U CN202121446148 U CN 202121446148U CN 215672220 U CN215672220 U CN 215672220U
- Authority
- CN
- China
- Prior art keywords
- protective cover
- shell body
- protection cover
- inclined shaft
- extra
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The utility model discloses a safety protection device for a transportation belt in TBM construction of a super-long inclined shaft of a coal mine, which comprises: the utility model discloses a protection cover, including belt and setting at the belt outlying crossbeam, the tip of protection cover shell body is provided with the fixed pin, the other end of protection cover shell body is provided with the bolt hole, the front surface left side edge of protection cover shell body is provided with fixed screw hole, fixed screw hole run through the front surface of protection cover shell body and with bolt hole intercommunication, the top of protection cover shell body is provided with the inflation inlet, the inflation inlet communicates with the trachea that sets up with the laminating of protection cover shell body inner wall, the top movable mounting of protection cover shell body has the protection cover upper cover, the inside of protection cover shell body is provided with the flexible control unit of control protection cover upper cover vertical lift, adopts concatenation formula design and kneck fixed firm can not produce the gap, and protector can be adjusted the height from top to bottom simultaneously, avoids the unable transportation condition of bulky soil block.
Description
Technical Field
The utility model relates to the technical field of TBM construction, in particular to a safety protection device for a transportation belt in the TBM construction of a super-long inclined shaft of a coal mine.
Background
The in-process that the TBM excavated inclined shaft is at the continuous production a large amount of earth of front end of shield structure machine, and this part earth uses earth to be transported to the outside of inclined shaft by a large amount, need consider the safety protection problem at the in-process that uses belt transportation, the potential safety hazard that the workman touched the belt and brought in avoiding narrow and small space.
Among the prior art, current belt safety protection is comparatively crude, mainly has two problems: 1. the splicing position of the anti-skid net or the protective cover can generate larger gaps, so that hidden dangers are easy to occur; 2. the height of the protective device after being fixed can not be adjusted, and the soil blocks with large volume can not be transported by using a belt.
Therefore, the safety protection device for the TBM construction transportation belt of the ultra-long inclined shaft of the coal mine is provided to solve the problems.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a safety protection device for a transportation belt in TBM construction of a super-long inclined shaft of a coal mine.
In order to achieve the purpose, the utility model provides a belt safety protection device for TBM construction and transportation of a super-long inclined shaft of a coal mine, which comprises: the protective cover comprises a belt and a cross beam arranged on the periphery of the belt, wherein a protective cover shell is arranged on the front surface of the cross beam, a fixing pin is arranged at the end part of the protective cover shell, a bolt hole is formed in the other end of the protective cover shell, a fixing threaded hole is formed in the left edge of the front surface of the protective cover shell, and the fixing threaded hole penetrates through the front surface of the protective cover shell and is communicated with the bolt hole;
the protection cover comprises a protection cover shell and is characterized in that an inflation inlet is formed in the upper portion of the protection cover shell, an air pipe communicated with the inflation inlet is arranged on the inner wall of the protection cover shell in a laminating mode, a protection cover upper cover is movably mounted at the top of the protection cover shell, and a telescopic control unit for controlling the protection cover upper cover to vertically lift is arranged inside the protection cover shell.
As a further optimization of the above scheme, an observation window is arranged on the front surface of the protective cover shell body, and the observation window comprises a sliding block and a sliding groove arranged on the surface of the protective cover shell body.
As the further optimization of above-mentioned scheme, fixed screw hole and fixed pin all are provided with two sets ofly, distribute respectively in the both sides of protection casing shell body.
As a further optimization of the scheme, the lower end of the upper cover of the protective cover is provided with an ejector rod, the ejector rod and the upper cover of the protective cover are of an integrated structure, and two groups of sliding balls embedded in the surfaces of the two groups of sliding balls are respectively arranged on the two sides of the ejector rod.
As a further optimization of the scheme, a first sliding groove for accommodating the ejector rod to slide up and down is arranged below the upper cover of the protective cover in the protective cover shell, and stop blocks are arranged at the joint of the left side and the right side of the top of the first sliding groove and the upper cover of the protective cover.
As a further optimization of the above scheme, the telescopic control unit comprises an air bag positioned at the bottom of the first sliding groove, the end part of the air pipe penetrates through the inner wall of the protective cover outer shell and is communicated with the end part of the air bag, and the other end of the air bag is in contact with the bottom of the ejector rod in a fitting manner.
As a further optimization of the above scheme, second sliding grooves are arranged on both sides of the first sliding groove, the positions of the second sliding grooves correspond to the positions of the sliding balls, and the ejector rod is connected with the first sliding groove in a sliding manner through the sliding balls and the second sliding grooves.
As a further optimization of the scheme, the air pipe is positioned below the upper cover of the protective cover and is provided with an extension pipe at the joint with the inner wall of the left side of the outer shell of the protective cover.
As a further optimization of the above scheme, the telescopic control units are provided in two groups, and the two groups of telescopic control units are respectively located on the left side and the right side of the protective cover outer shell.
The utility model discloses a safety protection device for a transportation belt in TBM construction of a super-long inclined shaft of a coal mine, which has the following beneficial effects:
1. the utility model provides a technical scheme that: the periphery of the belt is provided with a cross beam, the protective cover shell can be fixed on the front surface of the cross beam through fixing nuts, the number of the fixing nuts can be adjusted according to actual conditions, the distance of a TBM construction section is long and the TBM construction section is carried out in a gradual tunneling and growth mode, the protective cover shell is arranged into a splicing structure, fixing pins can extend into bolt holes of the next protective cover shell, two groups of protective cover shells are fixed through fixing threaded holes and fixing pins, and the protective device of the belt can be gradually increased along with the construction through the splicing design;
2. the utility model provides a technical scheme that: because the soil transporting amount and the size of the soil blocks can be correspondingly changed along with the change of the construction section, and the protective cover shell is arranged in advance to finish protection, when large soil blocks are encountered, compressed air is injected into an inflation inlet arranged above the protective cover shell, the compressed air can trigger a telescopic control unit arranged inside the protective cover shell through an air pipe, so that an upper cover of the protective cover positioned above the protective cover shell is lifted, the conveying of the large soil blocks can be met, when the volume of the soil blocks is reduced, the internal gas can be released through the inflation inlet, the height of the upper cover of the protective cover is reduced, the space occupation is reduced, meanwhile, the inflation inlets above a plurality of groups of protective cover shells can be connected through pipelines, when air is injected into the plurality of groups of protective cover shells, only air is required to be introduced from one pipe orifice, and the requirements of the transportation of the soil blocks with different sizes can be met through a lifting device, and also can protect workers from being involved in the belt.
There have been disclosed in detail certain embodiments of the utility model with reference to the following description and drawings, and it is to be understood that the embodiments of the utility model are not limited thereby, but are intended to cover within the spirit and scope of the appended claims, many changes, modifications, and equivalents.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the structure of the shield case of the present invention after being spliced
FIG. 3 is a left side view of the shield outer housing of the present invention;
FIG. 4 is an enlarged view of the interior of the structure at A in FIG. 2 according to the present invention;
FIG. 5 is a schematic cross-sectional view taken at B-B of FIG. 3 according to the present invention.
In the figure: 1. a protective cover outer shell; 2. a cross beam; 3. a belt; 4. an inflation inlet; 5. fixing the threaded hole; 6. a fixing pin; 7. fixing a nut; 8. an observation window; 9. a pin hole; 10. an air tube; 11. a telescopic pipe; 12. an air bag; 13. a sliding ball; 14. a first chute; 15. a stopper; 16. an upper cover of the protective cover; 17. a top rod; 18. a second runner.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the utility model and not to limit the scope of the utility model.
It should be noted that when an element is referred to as being "disposed on," or provided with "another element, it can be directly on the other element or intervening elements may also be present, when an element is referred to as being" connected, "or coupled to another element, it can be directly on the other element or intervening elements may be present, and" fixedly coupled "means that the element is fixedly coupled in many ways, which are not intended to be within the scope of the present disclosure, the terms" vertical, "" horizontal, "" left, "" right, "and the like are used herein for illustrative purposes only and are not intended to be a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in the specification are for the purpose of describing particular embodiments only and are not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items;
referring to the attached drawings 1-5 in the specification, the utility model provides a technical scheme: the utility model provides a colliery extra-long inclined shaft TBM construction transportation belt safety device, includes: the protective cover comprises a belt 3 and a cross beam 2 arranged on the periphery of the belt 3, wherein the front surface of the cross beam 2 is provided with a protective cover outer shell 1, the end part of the protective cover outer shell 1 is provided with a fixing pin 6, the other end of the protective cover outer shell 1 is provided with a bolt hole 9, the left edge of the front surface of the protective cover outer shell 1 is provided with a fixing threaded hole 5, and the fixing threaded hole 5 penetrates through the front surface of the protective cover outer shell 1 and is communicated with the bolt hole 9;
the protection cover comprises a protection cover outer shell 1 and is characterized in that an inflation inlet 4 is formed in the upper portion of the protection cover outer shell 1, an air pipe 10 communicated with the inflation inlet 4 is arranged on the inner wall of the protection cover outer shell 1 in a laminating mode, a protection cover upper cover 16 is movably mounted at the top of the protection cover outer shell 1, and a telescopic control unit for controlling the protection cover upper cover 16 to vertically lift is arranged inside the protection cover outer shell 1.
It should be noted that the periphery of the belt 3 is provided with the beam 2, the shield shell 1 can be fixed on the front surface of the beam 2 through the fixing nut 7, the number of the fixing nuts 7 can be adjusted according to the actual situation, because the distance of the TBM construction section is long and the TBM construction section is in a gradual tunneling and growth mode, the shield shell 1 is set to be a splicing structure, the fixing pin 6 can extend into the bolt hole 9 of the next set of shield shell 1, and the two sets of shield shells 1 are fixed through the fixing threaded hole 5 and the fixing pin 6, and the belt protection device can be gradually increased along with the construction through the splicing design;
because the soil transporting amount and the size of the soil blocks can be correspondingly changed along with the change of the construction section, and the protective cover outer shell 1 is arranged in advance to finish protection, when large soil blocks are encountered, compressed air is injected into the inflation inlet 4 arranged above the protective cover outer shell 1, the compressed air can trigger the telescopic control unit arranged inside the protective cover outer shell 1 through the air pipe 10 to lift the protective cover upper cover 16 arranged above the protective cover outer shell 1, the conveying of the large soil blocks can be met, when the volume of the soil blocks is reduced, the internal gas can be released through the inflation inlet 4, the height of the protective cover upper cover 16 is reduced, the space occupation is reduced, meanwhile, the inflation inlets 4 above a plurality of groups of protective cover outer shells 1 can be connected through pipelines, when air is injected into the plurality of groups of protective cover outer shells 1, only air is required to be introduced from one pipe orifice, the requirements of the transportation of the soil blocks with different sizes can be met through the lifting device, and also can protect workers from being involved in the belt.
According to fig. 1, the front surface of the protective cover outer housing 1 is provided with an observation window 8, and the observation window 8 comprises a slide block and a sliding groove arranged on the surface of the protective cover outer housing 1.
It should be noted that the slider above the observation window 8 is provided with a pull ring, so that the slider can be pulled to move laterally in the sliding groove, the condition inside the belt can be observed by moving the slider, and the height of the upper cover 16 of the protective cover can be adjusted in time.
In this embodiment, fixed screw hole 5 and fixed pin 6 all are provided with two sets ofly, distribute respectively in the both sides of protection casing shell body 1.
It should be noted that, when fixed pin 6 corresponds with another group's fixed screw hole 5, can fix into a whole with two sets of protection casing shells 1 through the nut, the fixed mode of nut also be convenient for the dismantlement in later stage, set up two sets of firmer that can make fixed more, avoid appearing the condition that the displacement produced the gap.
According to the illustration in fig. 3, the lower end of the upper cover 16 of the protective cover is provided with a post rod 17, the post rod 17 and the upper cover 16 of the protective cover are of an integrated structure, and two sets of sliding balls 13 embedded in the surface of the post rod 17 are respectively arranged on two sides of the post rod 17.
It should be noted that the integrated structure of the upper cover 16 and the push rod 17 of the protective cover can ensure the strength between the upper cover and the push rod, and the sliding ball 13 arranged on the surface of the push rod 17 can reduce the friction force when the push rod 17 slides, so that the upper cover 16 of the protective cover is more stable in the lifting process.
According to fig. 3, a first sliding groove 14 for accommodating the ejector rod 17 to slide up and down is arranged below the shield upper cover 16 in the shield outer shell 1, and stoppers 15 are arranged at the joint of the left side and the right side of the top of the first sliding groove 14 and the shield upper cover 16.
It should be noted that, a first sliding groove 14 is provided inside the protective cover outer housing 1, the push rod 17 can move up and down in the first sliding groove 14, stoppers 15 are provided on both left and right sides of the top of the first sliding groove 14, and the stoppers 15 are provided to prevent the push rod 17 from sliding out of the first sliding groove 14 during the lifting process of the protective cover upper cover 16, so as to prevent the sliding ball 13 from sliding out.
As shown in fig. 3, the expansion control unit includes an air bag 12 located at the bottom of the first chute 14, an end of the air tube 10 penetrates through the inner wall of the shield case 1 and communicates with an end of the air bag 12, and the other end of the air bag 12 is in contact with the bottom of the plunger 17.
It should be noted that, an extensible air bag 12 is disposed at the bottom of the first chute 14, and when air is injected through the inflation inlet 4, compressed air enters the interior of the air bag 12 through the air tube 10, and at this time, the interior of the air bag 12 is inflated and then gradually expands upwards, so as to gradually jack up the ejector rod 17, and further to drive the whole of the shield upper cover 16 to move upwards.
According to the illustration in fig. 4, the two sides of the first sliding groove 14 are both provided with the second sliding groove 18, the position of the second sliding groove 18 corresponds to the position of the sliding ball 13, and the ejector rod 17 is connected with the first sliding groove 14 in a sliding manner through the sliding ball 13 and the second sliding groove 18.
It should be noted that the second sliding grooves 18 disposed on both sides of the first sliding groove 14 are attached to the arc structure of the sliding ball 13, so as to ensure that the upper cover 16 of the protective cover does not move laterally in the process of sliding up and down, thereby ensuring the stability of sliding.
According to the figure 3, the air pipe 10 is arranged below the upper cover 16 of the protective hood and is provided with an extension pipe 11 at the joint with the left inner wall of the outer shell 1 of the protective hood.
It should be noted that the air tube 10 is required to be connected with the air bag 12 all the time in the process of lifting and lowering the upper cover 16 of the protective hood, in order to ensure the connection effect, the inner wall of the middle section of the air tube 10 on the left side of the outer shell 1 of the protective hood is replaced by a telescopic tube 11 which can be telescopic, the telescopic tube 11 is communicated with the air tube 10, and the condition that the middle section of air supply cannot occur in the lifting process of the upper cover 16 of the protective hood can be ensured.
In this embodiment, the flexible control unit is provided with two sets ofly, and two sets of flexible control unit are located the left and right sides of protection casing shell body 1 respectively.
It should be noted that, the telescopic control units are arranged on both sides of the protective cover shell 1, so that both sides can be ensured to be lifted simultaneously, and the phenomenon of jamming in the lifting process is avoided
This embodiment provides a pair of colliery special length inclined shaft TBM construction transportation belt safety device, the working process as follows:
the periphery of belt 3 is provided with crossbeam 2, protection casing shell 1 can be fixed at the front surface of crossbeam 2 through fixation nut 7, the quantity that fixation nut 7 set up can be adjusted according to actual conditions, because the distance ratio of TBM construction section is longer, and belong to and advance gradually the mode that the tunnelling increases, set protection casing shell 1 to the structure that can splice formula, fixed pin 6 can stretch into in the bolt hole 9 of a set of protection casing shell 1 down, and fix two sets of protection casing shell 1 through fixed screw hole 5 and fixed pin 6, can be along with the protector of the belt that increases gradually of carrying on of construction through the design of concatenation formula
Because the soil transporting amount and the size of the soil blocks can be correspondingly changed along with the change of the construction section, and the protective cover outer shell 1 is arranged in advance to finish protection, when large soil blocks are encountered, compressed air is injected into the inflation inlet 4 arranged above the protective cover outer shell 1, the compressed air can trigger the telescopic control unit arranged inside the protective cover outer shell 1 through the air pipe 10 to lift the protective cover upper cover 16 arranged above the protective cover outer shell 1, the conveying of the large soil blocks can be met, when the volume of the soil blocks is reduced, the internal gas can be released through the inflation inlet 4, the height of the protective cover upper cover 16 is reduced, the space occupation is reduced, meanwhile, the inflation inlets 4 above a plurality of groups of protective cover outer shells 1 can be connected through pipelines, when air is injected into the plurality of groups of protective cover outer shells 1, only air is required to be introduced from one pipe orifice, the requirements of the transportation of the soil blocks with different sizes can be met through the lifting device, and also can protect workers from being involved in the belt.
It should be understood that the present invention is not limited to the particular embodiments described herein, but is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model as defined by the appended claims.
Claims (9)
1. The utility model provides a colliery extra-long inclined shaft TBM construction transportation belt safety device, includes: belt (3) and setting are at belt (3) outlying crossbeam (2), its characterized in that: the front surface of the cross beam (2) is provided with a protective cover outer shell (1), the end part of the protective cover outer shell (1) is provided with a fixing pin (6), the other end of the protective cover outer shell (1) is provided with a bolt hole (9), the left side edge of the front surface of the protective cover outer shell (1) is provided with a fixing threaded hole (5), and the fixing threaded hole (5) penetrates through the front surface of the protective cover outer shell (1) and is communicated with the bolt hole (9);
the top of protection casing shell body (1) is provided with inflation inlet (4), the inner wall laminating of protection casing shell body (1) is provided with trachea (10) with inflation inlet (4) intercommunication, the top movable mounting of protection casing shell body (1) has protection casing upper cover (16), the inside of protection casing shell body (1) is provided with the flexible the control unit of control protection casing upper cover (16) vertical lift.
2. The safety protection device for the TBM construction transportation belt of the extra-long inclined shaft of the coal mine according to claim 1, is characterized in that: the front surface of protection casing shell body (1) is provided with observation window (8), observation window (8) contain the slider and set up the spout on protection casing shell body (1) surface.
3. The safety protection device for the TBM construction transportation belt of the extra-long inclined shaft of the coal mine according to claim 1, is characterized in that: the fixed threaded holes (5) and the fixed pins (6) are provided with two groups and are respectively distributed on two sides of the protective cover outer shell (1).
4. The safety protection device for the TBM construction transportation belt of the extra-long inclined shaft of the coal mine according to claim 1, is characterized in that: the lower end of the protective cover upper cover (16) is provided with an ejector rod (17), the ejector rod (17) and the protective cover upper cover (16) are of an integral structure, and two groups of sliding balls (13) embedded in the surfaces of the ejector rod (17) are arranged on two sides of the ejector rod respectively.
5. The safety protection device for the TBM construction transportation belt of the extra-long inclined shaft of the coal mine according to claim 4, is characterized in that: the lower position of protection casing upper cover (16) is provided with in the inside of protection casing shell body (1) and holds ejector pin (17) gliding first spout (14) from top to bottom, the top left and right sides of first spout (14) and the laminating department of protection casing upper cover (16) are provided with dog (15).
6. The safety protection device for the TBM construction transportation belt of the extra-long inclined shaft of the coal mine according to claim 5, is characterized in that: the flexible control unit contains gasbag (12) that are located the bottom of first spout (14), the tip of trachea (10) run through the inner wall of protection casing shell body (1) and with the tip intercommunication of gasbag (12), the other end of gasbag (12) and the bottom laminating contact of ejector pin (17).
7. The safety protection device for the TBM construction transportation belt of the extra-long inclined shaft of the coal mine according to claim 6, is characterized in that: the two sides of the first sliding groove (14) are provided with second sliding grooves (18), the positions of the second sliding grooves (18) correspond to the positions of the sliding balls (13), and the ejector rods (17) are connected with the first sliding groove (14) in a sliding mode through the sliding balls (13) and the second sliding grooves (18).
8. The safety protection device for the TBM construction transportation belt of the extra-long inclined shaft of the coal mine according to claim 1, is characterized in that: the air pipe (10) is positioned below the upper cover (16) of the protective cover and is provided with an extension pipe (11) at the joint with the inner wall of the left side of the outer shell (1) of the protective cover.
9. The safety protection device for the TBM construction transportation belt of the extra-long inclined shaft of the coal mine according to claim 8, is characterized in that: the telescopic control units are arranged in two groups, and the two groups of telescopic control units are respectively positioned on the left side and the right side of the protective cover outer shell (1).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202121446148.XU CN215672220U (en) | 2021-06-28 | 2021-06-28 | Colliery extra-long inclined shaft TBM construction transportation belt safety device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202121446148.XU CN215672220U (en) | 2021-06-28 | 2021-06-28 | Colliery extra-long inclined shaft TBM construction transportation belt safety device |
Publications (1)
Publication Number | Publication Date |
---|---|
CN215672220U true CN215672220U (en) | 2022-01-28 |
Family
ID=79977426
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202121446148.XU Active CN215672220U (en) | 2021-06-28 | 2021-06-28 | Colliery extra-long inclined shaft TBM construction transportation belt safety device |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN215672220U (en) |
-
2021
- 2021-06-28 CN CN202121446148.XU patent/CN215672220U/en active Active
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN107060749B (en) | Tunneling and anchoring integrated fully-mechanized excavating machine adopting 4 anchor rod drilling machine advanced anchor protection | |
CN106837334B (en) | A kind of anchor combined machine set system of full-mechanized roadway multi rack automatic moving type branch | |
CN101463729A (en) | Hydraulic support for large-mining height caving coal | |
CN103410545B (en) | The hydraulic support of Sub-Level Caving and packing job can be realized | |
CN201588645U (en) | High-end hydraulic support suitable for small drift | |
CN109838261A (en) | A kind of novel full-mechanized roadway advance support rack | |
CN102720517B (en) | Advance support, advance support set and advance supporting device | |
CN110541705B (en) | Crawler type excavating, supporting and anchoring combined unit and application method thereof | |
CN105697045B (en) | Driving face telescopic top beam brace type gib method | |
CN108374684A (en) | Fully-mechanized mining working faces end head abnormal shape support apparatus | |
CN204327140U (en) | A kind of gob side entry retaining gear cash device | |
CN215672220U (en) | Colliery extra-long inclined shaft TBM construction transportation belt safety device | |
CN214697899U (en) | Coal mine fully-mechanized mining working face anti-flying gangue side protecting device | |
CN104389627A (en) | Support mounting platform | |
CN208184763U (en) | Fully-mechanized mining working faces end head abnormal shape support apparatus | |
CN101509388A (en) | Tunnel ahead support stent | |
CN204691766U (en) | One is driving system fast and safely | |
CN104832172B (en) | A kind of fast and safely driving system and method | |
CN210152698U (en) | Backpack type comprehensive digging roadway temporary support equipment | |
CN207761644U (en) | Tunnel piercing trolley | |
CN202866848U (en) | Top coal caving support capable of preventing extensible beam from offsetting | |
CN210889001U (en) | Large-inclination hydraulic support | |
CN209724379U (en) | A kind of underground coal mine roof fall deliverance apparatus | |
CN107893661A (en) | Tunnel piercing chassis | |
CN207260963U (en) | A kind of highway bridge construction drilling platform |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
GR01 | Patent grant | ||
GR01 | Patent grant |