CN211500694U - Coal mine tunnel supporting equipment - Google Patents

Coal mine tunnel supporting equipment Download PDF

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Publication number
CN211500694U
CN211500694U CN201921973108.3U CN201921973108U CN211500694U CN 211500694 U CN211500694 U CN 211500694U CN 201921973108 U CN201921973108 U CN 201921973108U CN 211500694 U CN211500694 U CN 211500694U
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CN
China
Prior art keywords
base
bearing
hinged
coal mine
rod
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.)
Expired - Fee Related
Application number
CN201921973108.3U
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Chinese (zh)
Inventor
李建华
宋亚新
贺艳军
李治平
张永客
王永峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lijiahao Coal Mine of Shenhua Baotou Energy Co Ltd
Original Assignee
Lijiahao Coal Mine of Shenhua Baotou Energy Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lijiahao Coal Mine of Shenhua Baotou Energy Co Ltd filed Critical Lijiahao Coal Mine of Shenhua Baotou Energy Co Ltd
Priority to CN201921973108.3U priority Critical patent/CN211500694U/en
Application granted granted Critical
Publication of CN211500694U publication Critical patent/CN211500694U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a colliery tunnel supporting equipment, including base, alternately flexible arm, pushing mechanism, elevating platform and guard plate, parallel interval is provided with two sets of alternately flexible arms between the elevating platform is located the top of base and elevating platform and the base, thereby pushing mechanism is used for promoting alternately flexible arm to stretch out and draw back and drive the elevating platform and rise or descend, and the guard plate is installed at the top of elevating platform, and the guard plate is used for supporting with the contact of tunnel top surface. The coal mine roadway supporting equipment of the utility model is additionally provided with the roller and the auxiliary support at the bottom of the supporting equipment, so that the supporting equipment can be conveniently moved in place and then fixed, and the labor force for moving back and forth is saved; meanwhile, the retraction and extension of the cross telescopic arm are pushed by the pushing mechanism, so that the lifting platform can be lifted to adapt to different roadway heights, and the operation is more convenient; the guard plate can be better in the assurance tunnel safety, prevent to collapse.

Description

Coal mine tunnel supporting equipment
Technical Field
The utility model relates to a mining equipment technical field especially relates to a coal mine tunnel struts equipment.
Background
Coal mine in China is mainly underground mining, and is required to be excavated into a tunnel for mining coal, and the tunnel is a variety of drilled passages between the ground surface and an ore body and is used for carrying ore, ventilating, draining water, pedestrians, various necessary preparation projects newly excavated for mining the ore by metallurgical equipment, and the like.
In the construction operation of mining, tunnel, etc., the excavation construction tunnel is often supported by special supporting equipment, while the structural strength of the tunnel is improved, accidents such as collapse of the top of the tunnel, etc. are effectively prevented, so the equipment usage amount for the tunnel supporting operation is huge, but in the practical use, the currently used supporting equipment is often relatively complex in structure, high in installation positioning and control difficulty, and high in requirements on the installation construction site environment and the tunnel structure, so that the construction flexibility, reliability and efficiency of the current supporting equipment during the tunnel supporting operation are relatively poor, the construction cost and daily maintenance cost are relatively high, and the requirements of the actual construction operation are difficult to meet, therefore, aiming at the problem, a novel tunnel supporting equipment is urgently needed to be developed, to meet the requirements of practical use.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a colliery tunnel struts equipment to solve the problem that above-mentioned prior art exists, this equipment structure is simple, and it is nimble convenient to use, and the support body is reliable and stable, has good place adaptability and location bearing capacity.
In order to achieve the above object, the utility model provides a following scheme: the utility model provides a colliery tunnel struts equipment, including base, alternately flexible arm, pushing mechanism, elevating platform and guard plate, the elevating platform is located the top of base just parallel interval is provided with two sets of alternately flexible arms between elevating platform and the base, pushing mechanism is used for promoting thereby alternately flexible arm stretches out and draws back and drives the elevating platform rises or descends, install at the top of elevating platform the guard plate, the guard plate is used for supporting with the contact of tunnel top surface.
Furthermore, four rollers capable of driving the base to move are arranged on the base, and auxiliary supports are arranged on the inner sides of the four rollers; the auxiliary support comprises a bottom foot, a screw rod and a handle, the bottom end of the screw rod penetrates through the base and is integrally connected with the bottom foot, the bottom foot is used for supporting on the ground, and the handle is installed at the top end of the screw rod; the screw rod is in threaded connection with the base.
Furthermore, the cross telescopic arm comprises two connecting rods which are arranged in a cross mode and hinged to each other at the middle part, the lower end part of one connecting rod is hinged to the base, and the upper end part of the connecting rod is connected with the sliding groove in the bottom surface of the lifting platform in a sliding mode; the upper end part of the other connecting rod is hinged with the bottom surface of the lifting platform, and the lower end part of the other connecting rod is connected with the base in a sliding manner.
Furthermore, the pushing mechanism is used for pushing the two connecting rods which are connected with the base in a sliding mode to move left and right along the base so as to drive the lifting platform to lift; and the middle hinged positions of the two groups of crossed telescopic arms are connected with a supporting beam.
Furthermore, the pushing mechanism comprises a driving motor, guide rails, a long sliding block and pushing rods, two guide rails are symmetrically installed on the inner sides of two groups of crossed telescopic arms on the base, two ends of the long sliding block are slidably arranged in sliding grooves of the two guide rails, and two connecting rods, the lower end parts of which are slidably connected with the base, are fixedly connected with two ends of the long sliding block respectively; one end of the push rod is hinged to the long sliding block, the other end of the push rod is hinged to the supporting cross beam, and the driving motor is used for driving the long sliding block to reciprocate on the guide rail.
Furthermore, the pushing mechanism also comprises a screw and nut transmission structure arranged on the base, and the screw and nut transmission structure comprises a screw penetrating through the base and a nut in threaded connection with the screw; the direction of the lead screw is perpendicular to the moving direction of the long sliding block, the middle of the long sliding block is fixedly arranged at the top of the nut, and the output end of the driving motor is in transmission connection with the input end of the lead screw through a speed reducer.
Furthermore, the number of the push rods is two, and the two push rods are respectively arranged at the positions, close to the crossed telescopic arms, of the two sides of the screw rod.
Furthermore, the top surface of the lifting platform is provided with the protection plate through a bearing column head in a supporting mode, and the protection plate is hinged to the upper end face of the bearing column head through a rotary table mechanism.
Furthermore, the protection plate comprises a main bearing plate, an auxiliary bearing plate and driving rods, wherein the main bearing plate is connected with the bearing column cap and coaxially distributed, at least two auxiliary bearing plates are uniformly distributed at the positions of the side surfaces of the main bearing plate around the axis of the main bearing plate, the auxiliary bearing plates are hinged with the side surfaces of the main bearing plate and form included angles of 0-90 degrees, the rear surfaces of the auxiliary bearing plates are connected with the rear surface of the main bearing plate through at least one driving rod, and the two ends of each driving rod are hinged with the main bearing plate and the auxiliary bearing plate respectively.
Furthermore, the upper surfaces of the main bearing plate and the auxiliary bearing plate are respectively provided with a bearing groove with the cross section of ㄩ', the side wall of the bearing groove is provided with at least two flow guide holes, a plurality of conical bearing blocks are uniformly distributed in the bearing groove, the upper end surfaces of the bearing blocks are 0-50 mm higher than the upper end surface of the bearing groove, and the bearing blocks are uniformly distributed around the axis of the bearing groove.
The utility model discloses for prior art gain following technological effect:
the coal mine roadway supporting equipment of the utility model is additionally provided with the roller and the auxiliary support at the bottom of the supporting equipment, so that the supporting equipment can be conveniently moved in place and then fixed, and the labor force for moving back and forth is saved; meanwhile, the retraction and extension of the cross telescopic arm are pushed by the pushing mechanism, so that the lifting platform can be lifted to adapt to different roadway heights, and the operation is more convenient; the guard plate can be better in the assurance tunnel safety, prevent to collapse.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of a coal mine roadway support device;
FIG. 2 is a schematic structural view of the guard plate;
FIG. 3 is a schematic view of the pushing mechanism;
FIG. 4 is a schematic structural view of the auxiliary support;
wherein, 1, a base; 11 a nut; 12 a guide rail; 13 a reducer; 14 driving a motor; 15 a handle; 16 a screw rod; 17 feet; 2, lifting the platform; 21 carrying the column head; 22 a turntable mechanism; 3, rolling wheels; 4 connecting rods; 5 pushing the rod; 6 supporting the cross beam; 7 long sliding blocks; 8, a lead screw; 9 protective plates; 91 a main carrier plate; 92 an auxiliary carrier plate; 93 a drive rod; 94 a load-bearing slot; and 95 flow guide holes.
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 belong to the protection scope of the present invention.
The utility model aims at providing a colliery tunnel struts equipment to solve the problem that above-mentioned prior art exists, this equipment structure is simple, and it is nimble convenient to use, and the support body is reliable and stable, has good place adaptability and location bearing capacity.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1-4, the utility model provides a colliery tunnel supporting equipment, including base 1, alternately flexible arm, pushing mechanism, elevating platform 2 and guard plate 9, parallel interval is provided with two sets of alternately flexible arms between elevating platform 2 and the base 1 and at the top that elevating platform 2 is located base 1, thereby pushing mechanism is used for promoting alternately flexible arm to stretch out and draw back and drive elevating platform 2 and rise or descend, guard plate 9 is installed at the top of elevating platform 2, guard plate 9 is used for supporting with the contact of tunnel top surface.
The base 1 is also provided with a power source capable of driving the roller 3 to move, and the roller 3 is driven to move by the power source, so that the labor is saved, the operation is convenient and rapid, and the efficiency is high; the power source can be a motor or an oil engine; the motor has the advantages of environmental protection and convenient control, and the fuel oil engine has the advantages of wide application range, no need of arranging electric wires, strong universality and more extensive and flexible use. The motor is preferably adopted in the technical scheme, and the rechargeable storage battery is arranged on the base 1 to supply power for the motor, so that the use is convenient and reliable. The auxiliary support comprises a bottom foot 17, a screw rod 16 and a handle 15, the bottom end of the screw rod 16 penetrates through the base 1 and is integrally connected with the bottom foot 17, the bottom foot 17 is used for supporting on the ground, and the handle 15 is installed at the top end of the screw rod 16; the screw rod 16 is screwed with the base 1. When the mobile supporting equipment enters the roadway, the auxiliary support is in a retracted state, the supporting equipment is pushed to a specified position, and then the auxiliary support is put down and tightly pushed, so that the operation is simple and convenient. The bottom of the supporting equipment is additionally provided with the trundles and the auxiliary supporting devices, so that the supporting equipment can be conveniently moved in place and then fixed, and the labor force for moving back and forth is saved.
The cross telescopic arm comprises two connecting rods 4 which are arranged in a cross way and are hinged with each other in the middle, wherein the lower end part of one connecting rod 4 is hinged with the base 1, and the upper end part is connected with the sliding groove on the bottom surface of the lifting platform 2 in a sliding way; the upper end part of the other connecting rod 4 is hinged with the bottom surface of the lifting platform 2, and the lower end part is connected with the base 1 in a sliding way. The middle hinged position of the two groups of crossed telescopic arms is connected with a supporting beam 6, the pushing mechanism comprises a driving motor 14, guide rails 12, a long sliding block 7 and a pushing rod 5, the two guide rails 12 are symmetrically arranged on the inner sides of the two groups of crossed telescopic arms on the base 1, two ends of the long sliding block 7 are slidably arranged in sliding grooves of the two guide rails 12, and two connecting rods 4 of which the lower ends are slidably connected with the base 1 are respectively and fixedly connected with two ends of the long sliding block 7; one end of the push rod 5 is hinged on the long slide block 7, the other end is hinged with the supporting beam 6, and the driving motor 14 is used for driving the long slide block 7 to reciprocate on the guide rail 12.
Furthermore, the pushing mechanism also comprises a screw 8 and nut 11 transmission structure arranged on the base 1, and the screw 8 and nut 11 transmission structure comprises a screw 8 arranged on the base 1 in a penetrating manner and a nut 11 connected with the screw 8 in a threaded manner; the direction of the screw 8 is perpendicular to the moving direction of the long slide block 7, the middle part of the long slide block 7 is fixedly arranged at the top of the nut 11, and the output end of the driving motor 14 is in transmission connection with the input end of the screw 8 through the speed reducer 13.
When the driving motor 14 drives the reducer 13 to drive the lead screw 8 to rotate, the screw nut 11 on the lead screw 8 drags the long slider 7 to reciprocate, the connecting rod 4 hinged at two ends of the long slider 7 and the pushing rods 5 at two sides move along with the long slider 7 to realize the lifting of the lifting platform 2, when the long slider 7 moves to the foremost end of the base 1, the inclination of the pushing rods 5 is smaller, and the height of the lifting platform 2 is reduced at the moment; when the long slide block 7 on the lead screw 8 driving screw 11 moves towards the inner side of the base 1, the pushing rod 5 drives the connecting rod 4 to gradually increase in inclination, the height of the lifting platform 2 gradually rises at the moment, and after the protection plate 9 at the top of the lifting platform 2 is tightly supported and supported by the roadway top surface, the pushing mechanism stops working.
In the lifting process of the lifting platform 2, the function of the slide block structure of the guide rail 12 not only plays a role of connecting and driving the two sides of the crossed telescopic arms to move, but also can ensure the smoothness of the reciprocating motion of the push rod 5, and the straight reciprocating motion can be carried out along the horizontal direction so as not to deviate. The push rod 5 is a rigid connection push rod or a hydraulic rod. The number of the push rods 5 is two, and the two push rods 5 are respectively arranged at the positions, close to the crossed telescopic arms, of the two sides of the screw rod 8.
Furthermore, the top surface of the lifting platform 2 is supported with a protection plate 9 through a bearing column head 21, and the protection plate 9 and the upper end surface of the bearing column head 21 are hinged with each other through a turntable mechanism 22.
The protection plate 9 is hinged to the upper end face of the bearing column head 21 through the turntable mechanism 22 and is coaxially distributed with the bearing column head 21, the protection plate 9 comprises a main bearing plate 91, auxiliary bearing plates 92 and a driving rod 93, the main bearing plate 91 is connected with the bearing column head 21 and coaxially distributed, at least two auxiliary bearing plates 92 are uniformly distributed at the side surface position of the main bearing plate 91 around the axis of the main bearing plate 91, the auxiliary bearing plates 92 are hinged to the side surface of the main bearing plate 91 and form an included angle of 0-90 degrees, the rear surface of each auxiliary bearing plate 92 is connected with the rear surface of the main bearing plate 91 through at least one driving rod 93, and two ends of each driving rod 93 are respectively hinged to the main bearing plate 91 and the. The upper surfaces of the main bearing plate 91 and the auxiliary bearing plate 92 are both provided with a bearing groove 94 with a cross section of 'ㄩ', the side wall of the bearing groove 94 is provided with at least two flow guide holes 95, a plurality of conical bearing blocks are uniformly distributed in the bearing groove 94, the upper end surfaces of the bearing blocks are 0-50 mm higher than the upper end surface of the bearing groove 94, and the bearing blocks are uniformly distributed around the axis of the bearing groove 94.
When the supporting operation is carried out, firstly, a supporting operation working face is set in a roadway according to construction requirements, then the assembled supporting equipment is transferred to the position of the supporting operation working face through the idler wheel 3, after the supporting operation working face is in place, the auxiliary support is screwed down to fixedly support the supporting equipment on the ground, then the lifting platform 2 is driven by the pushing mechanism to ascend to a certain height through the cross telescopic arm, the protection plate 9 at the front end of the bearing column head 21 is abutted against the top of the roadway, then the included angle between the main bearing plate 91 and each auxiliary bearing plate 92 on the protection plate 9 is adjusted through the driving rod 93, the main bearing plate 91 and the auxiliary bearing plates 92 are abutted against the top of the roadway, the supporting operation on the roadway can be completed, and when the supporting operation is required to be removed and replaced, the removing operation on the supporting equipment can be realized through reverse operation.
When the operation is strutted, the bearing block front end on the protection plate 9 is embedded into the top of the roadway, meanwhile, according to the use requirement, pouring materials such as concrete are injected into the bearing groove 94 through the flow guide holes 95 in the side wall of the bearing groove 94, the requirement of the operation of strutting the top of the roadway is met, meanwhile, when the pouring materials are strutted, in addition, when the equipment is assembled, a reinforcing rib plate which is of a net structure is preset in the bearing groove 94 of the protection plate 9, and the bracing capability of the pouring materials is enhanced through the reinforcing ribs when the pouring materials are poured.
The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims (10)

1. The utility model provides a colliery tunnel supports equipment which characterized in that: including base, alternately flexible arm, pushing mechanism, elevating platform and guard plate, the elevating platform is located the top of base just parallel interval is provided with two sets of alternately flexible arms between elevating platform and the base, pushing mechanism is used for promoting thereby alternately flexible arm stretches out and draws back and drives the elevating platform rises or descends, install at the top of elevating platform the guard plate, the guard plate is used for contacting with tunnel top surface and supports.
2. A coal mine roadway support apparatus as claimed in claim 1, wherein: the base is provided with four rollers capable of driving the base to move, and auxiliary supports are arranged on the inner sides of the four rollers; the auxiliary support comprises a bottom foot, a screw rod and a handle, the bottom end of the screw rod penetrates through the base and is integrally connected with the bottom foot, the bottom foot is used for supporting on the ground, and the handle is installed at the top end of the screw rod; the screw rod is in threaded connection with the base.
3. A coal mine roadway support apparatus as claimed in claim 1, wherein: the cross telescopic arm comprises two connecting rods which are arranged in a cross manner and are hinged with each other in the middle, the lower end part of one connecting rod is hinged with the base, and the upper end part of the connecting rod is connected with the sliding groove in the bottom surface of the lifting platform in a sliding manner; the upper end part of the other connecting rod is hinged with the bottom surface of the lifting platform, and the lower end part of the other connecting rod is connected with the base in a sliding manner.
4. A coal mine roadway support apparatus as claimed in claim 3, wherein: the pushing mechanism is used for pushing the two connecting rods which are connected with the base in a sliding mode to move left and right along the base so as to drive the lifting platform to lift; and the middle hinged positions of the two groups of crossed telescopic arms are connected with a supporting beam.
5. A coal mine roadway support apparatus as claimed in claim 4, wherein: the pushing mechanism comprises a driving motor, guide rails, a long sliding block and a pushing rod, two guide rails are symmetrically arranged on the inner sides of two groups of crossed telescopic arms on the base, two ends of the long sliding block are slidably arranged in sliding grooves of the two guide rails, and two connecting rods, the lower end parts of which are slidably connected with the base, are respectively fixedly connected with two ends of the long sliding block; one end of the push rod is hinged to the long sliding block, the other end of the push rod is hinged to the supporting cross beam, and the driving motor is used for driving the long sliding block to reciprocate on the guide rail.
6. A coal mine roadway support apparatus as claimed in claim 5, wherein: the pushing mechanism further comprises a screw and nut transmission structure arranged on the base, and the screw and nut transmission structure comprises a screw penetrating through the base and a nut in threaded connection with the screw; the direction of the lead screw is perpendicular to the moving direction of the long sliding block, the middle of the long sliding block is fixedly arranged at the top of the nut, and the output end of the driving motor is in transmission connection with the input end of the lead screw through a speed reducer.
7. A coal mine roadway support apparatus as claimed in claim 6, wherein: the number of the push rods is two, and the two push rods are respectively arranged at the positions, close to the crossed telescopic arms, of the two sides of the screw rod.
8. A coal mine roadway support apparatus as claimed in claim 1, wherein: the top surface of the lifting platform is provided with the protection plate through a bearing column head support, and the protection plate is hinged with the upper end surface of the bearing column head through a turntable mechanism.
9. A coal mine roadway support apparatus as claimed in claim 1, wherein: the protective plate comprises a main bearing plate, an auxiliary bearing plate and driving rods, wherein the main bearing plate is connected with the bearing column cap and coaxially distributed, the number of the auxiliary bearing plates is at least two, the auxiliary bearing plates are uniformly distributed at the positions of the side surfaces of the main bearing plate around the axis of the main bearing plate, the auxiliary bearing plate is hinged to the side surfaces of the main bearing plate and forms an included angle of 0-90 degrees, the rear surfaces of the auxiliary bearing plates are connected with the rear surfaces of the main bearing plate through at least one driving rod, and the two ends of each driving rod are hinged to the main bearing plate and the.
10. A coal mine roadway support apparatus as claimed in claim 9, wherein: the bearing grooves with the cross sections of ㄩ are formed in the upper surfaces of the main bearing plate and the auxiliary bearing plate, at least two flow guide holes are formed in the side walls of the bearing grooves, a plurality of conical bearing blocks are uniformly distributed in the bearing grooves, the upper end faces of the bearing blocks are 0-50 mm higher than the upper end faces of the bearing grooves, and the bearing blocks are uniformly distributed around the axis of the bearing grooves.
CN201921973108.3U 2019-11-15 2019-11-15 Coal mine tunnel supporting equipment Expired - Fee Related CN211500694U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921973108.3U CN211500694U (en) 2019-11-15 2019-11-15 Coal mine tunnel supporting equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921973108.3U CN211500694U (en) 2019-11-15 2019-11-15 Coal mine tunnel supporting equipment

Publications (1)

Publication Number Publication Date
CN211500694U true CN211500694U (en) 2020-09-15

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Application Number Title Priority Date Filing Date
CN201921973108.3U Expired - Fee Related CN211500694U (en) 2019-11-15 2019-11-15 Coal mine tunnel supporting equipment

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CN (1) CN211500694U (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112282816A (en) * 2020-10-28 2021-01-29 贵州理工学院 Roadway support device capable of being deployed rapidly
CN112302698A (en) * 2020-10-28 2021-02-02 贵州理工学院 Folding hydraulic tunnel supporting device convenient to carry
CN113513351A (en) * 2021-08-04 2021-10-19 扎赉诺尔煤业有限责任公司 Support vehicle and delivery vehicle
CN113588190A (en) * 2021-10-08 2021-11-02 四川藏区高速公路有限责任公司 Vibration response test device for blasting construction to adjacent existing tunnel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112282816A (en) * 2020-10-28 2021-01-29 贵州理工学院 Roadway support device capable of being deployed rapidly
CN112302698A (en) * 2020-10-28 2021-02-02 贵州理工学院 Folding hydraulic tunnel supporting device convenient to carry
CN113513351A (en) * 2021-08-04 2021-10-19 扎赉诺尔煤业有限责任公司 Support vehicle and delivery vehicle
CN113513351B (en) * 2021-08-04 2023-09-15 扎赉诺尔煤业有限责任公司 Support car and delivery car
CN113588190A (en) * 2021-10-08 2021-11-02 四川藏区高速公路有限责任公司 Vibration response test device for blasting construction to adjacent existing tunnel

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200915

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