CN116480395A - Comprehensive digging roadway temporary support unit capable of being asynchronously coupled and leveled - Google Patents
Comprehensive digging roadway temporary support unit capable of being asynchronously coupled and leveled Download PDFInfo
- Publication number
- CN116480395A CN116480395A CN202310462204.6A CN202310462204A CN116480395A CN 116480395 A CN116480395 A CN 116480395A CN 202310462204 A CN202310462204 A CN 202310462204A CN 116480395 A CN116480395 A CN 116480395A
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- support
- hydraulic cylinder
- hydraulic
- temporary support
- column
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- 230000008878 coupling Effects 0.000 claims abstract description 20
- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 19
- 230000009471 action Effects 0.000 claims description 18
- 238000006880 cross-coupling reaction Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 6
- 230000032798 delamination Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims 1
- 239000011435 rock Substances 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 3
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract 1
- 230000005641 tunneling Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/10—Details of mine caps for engaging the tops of pit-props, with or without retaining-plates; Retaining-plates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
Patent name: summary of comprehensive tunnel temporary support unit capable of asynchronously coupling and leveling: the invention relates to a comprehensive tunnel temporary support unit capable of being asynchronously coupled and leveled, belonging to the field of comprehensive tunnel integration of coal mines. The single hydraulic support comprises five parts of a top beam, four upright column parts, a side supporting mechanism, a base and a pushing cylinder. According to the invention, four upright posts are designed to be connected with a top plate spherical hinge structure, a single support frame is designed for single temporary support, a highest point-by-highest point bidirectional asynchronous control system is designed for carrying out basic leveling on the four upright posts of the single support frame of the non-horizontal roadway, then the tracking error of a multi-cylinder driving system and the synchronous error of an adjacent hydraulic cylinder are integrated, an adjacent coupling cross controller is designed for carrying out highest point-by-highest point bidirectional asynchronous coupling leveling control on the four upright posts, so that safe, rapid, stable and effective temporary support of the fully-mechanized roadway under different geological conditions is realized, and the fully-mechanized excavation efficiency and safety are improved.
Description
Technical Field
The invention belongs to the technical field of underground coal mine comprehensive tunnel temporary support, and particularly relates to a comprehensive tunnel temporary support unit capable of being asynchronously coupled and leveled.
Background
The unbalanced tunneling and supporting is a key factor for limiting the opening probability of the underground tunneling machine, in the traditional tunneling process, no temporary supporting equipment exists, the overhead operation exists, the manual supporting time is more than half of the tunneling operation, the working procedure is complex, and the requirement of the underground tunneling process cannot be met.
In recent years, a plurality of research institutions in China develop a plurality of excavating, supporting and anchoring integrated systems which adapt to different conditions; the temporary support equipment is adopted to carry out temporary support, so that the tunneling and support are changed from serial operation to parallel operation, and the method has a great application space due to safety and convenience.
However, when the temporary support procedure of fully-mechanized roadway is carried out, severe roadway working conditions and complex geological environments easily cause the phenomenon that temporary support equipment is inclined in pose and uneven in stress, the intelligent degree of some existing temporary support equipment is low, the existing temporary support equipment cannot adapt to different roadway geological conditions, particularly the effective support of the top plate and the side wall of a non-horizontal roadway is seriously influenced, the temporary support equipment is supported and supported effectively, and therefore the tunneling efficiency and the tunneling efficiency of the roadway are reduced.
In order to solve the problems, the invention designs a four-upright-column highest-point bidirectional asynchronous coupling leveling comprehensive digging roadway pushing stepping type temporary support unit, the structure of the four-upright-column bidirectional asynchronous coupling leveling comprehensive digging roadway pushing stepping type temporary support unit consists of a front support and a rear support, the push-pull type automatic support of the temporary support unit is high in intelligent degree, the four-upright-column asynchronous coupling leveling can be realized, and the temporary support unit is ensured to realize rapid and non-delamination support in the working conditions of a concave top plate and a convex bottom plate; the machine set has strong adaptability to the roadway, can effectively support the top plate and the side walls of the roadway under different working conditions, meets the environmental requirements of various complicated roadways, and greatly enhances the universality and the safety of temporary roadway support.
Disclosure of Invention
The invention provides a comprehensive tunnel temporary support unit capable of asynchronously coupling and leveling, which mainly comprises two parts: (1) The multi-degree-of-freedom pushing stepping type temporary support unit capable of being controlled in an asynchronous mode structurally is designed, and (2) a four-column highest-point-by-highest-point bidirectional asynchronous coupling leveling control system and method are designed for the temporary support unit.
The intelligent pushing step type temporary support unit is provided for the fully-mechanized excavation face, and can effectively support a roof and two sides in time under different geological conditions, especially under non-horizontal roadways, so that the temporary support efficiency and the adaptability of the support unit under different geological conditions are improved, and safe, rapid and effective temporary support is realized.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the pushing step type temporary support unit comprises a front hydraulic support and a rear hydraulic support which are connected through a spherical hinge type pushing cylinder, so that the multi-degree-of-freedom automatic support moving in a pushing step type in the temporary support process can be realized, and the front base and the rear base move on the non-same horizontal plane when the tunnel is sunken or protrudes.
The single four-column hydraulic support comprises five parts, namely a top beam, four column parts, a side supporting mechanism, a base and a pushing cylinder. The top beam is connected with the four upright posts through a spherical hinge structure, so that the asynchronous telescopic and leveling of the four upright posts of the support is structurally met. The side supporting structure is a telescopic supporting structure for supporting the hydraulic cylinder and matched with the sliding block arm, and comprises the side supporting hydraulic cylinder, the sliding block arm, the sliding block and the side supporting plate, wherein the sliding block arm is connected with the supporting plate and the side hydraulic cylinder through the sliding block, and the sliding block arm stretches to the two sides to support the upper under the telescopic driving of the side supporting hydraulic cylinder.
The four-column highest-point bidirectional asynchronous coupling leveling control system and the four-column highest-point bidirectional asynchronous coupling leveling control method are characterized by comprising a four-column highest-point asynchronous leveling control system and a four-hydraulic cylinder adjacent cross coupling control system, wherein the two systems are combined, and rapid and stable non-delamination supporting of a single support under a non-horizontal roadway is realized.
The four-column highest-point asynchronous leveling control system is characterized in that: and a displacement sensor is respectively arranged in four upright cylinders of each support and used for detecting the displacement expansion quantity of a single upright, and a strapdown inertial navigation sensor is arranged under each support top beam and used for detecting the position change of the support top beam. The bidirectional asynchronous control method for the highest point is that when 4 action points of the upright column hydraulic cylinder and the top beam are not on the same horizontal plane due to the working condition of a non-horizontal bottom plate, one action point position of the 4 action points is in the highest position of the horizontal plane compared with the other 3 action points, at the moment, the output displacement of the supporting upright column hydraulic cylinder corresponding to the action point is kept still, and the other 3 supporting upright column hydraulic cylinders are lifted to the horizontal height corresponding to the highest action point.
The four-hydraulic-cylinder adjacent cross-coupling control system is characterized in that in a multi-cylinder driving system, in order to improve control precision, tracking errors of hydraulic cylinders are taken into consideration, and synchronization errors between two hydraulic cylinders adjacent to the hydraulic cylinders are needed to be taken into account. The adjacent cross coupling control structure is designed to integrally control the four hydraulic cylinders, the hydraulic cylinder output displacement resolving result of the bidirectional asynchronous leveling control method with the highest point is taken as the expected displacement signal input of the adjacent coupling controller, so that the tracking error and the synchronous error precision of the four upright posts are controlled within 2mm, the requirement of the attitude stability of a non-horizontal roadway is met, and the rapid stable support is realized.
Compared with the prior art, the comprehensive tunnel temporary support unit capable of being asynchronously coupled and leveled has the following advantages:
(1) Aiming at the problem of temporary support of a fully-mechanized roadway, the invention provides a fully-mechanized roadway pushing and stepping type temporary support unit, which adopts a front-back double-frame pushing and stepping type structure, and two frames are connected by a spherical hinge type pushing oil cylinder, so that multiple-degree-of-freedom moving frames when the roadway is sunken or raised are met.
(2) The four upright posts of the single hydraulic support are connected with the top beam through the spherical hinge structure, so that the asynchronous support structure requirement when the single support base is not on the same datum plane is met. The side supporting structure is connected with the supporting plate and the side hydraulic cylinder through the sliding block arm, and stretches and supports to two sides under the telescopic driving of the side supporting hydraulic cylinder. The single bracket has extremely high adaptability and extremely high practicability to different geological conditions and roadways with different sizes.
(3) Aiming at the provided roadway temporary support, the invention designs a four-column highest-point bidirectional asynchronous coupling leveling control system and a four-hydraulic-cylinder adjacent cross coupling leveling control system, and the system combines the two control systems of the highest-point asynchronous leveling control system and the four-hydraulic-cylinder adjacent cross coupling control system, so that the rapid and stable non-delamination support of a single support of a non-horizontal roadway is realized, and the safety, adaptability and stability of the comprehensive roadway temporary support are greatly improved.
The foregoing description is only an overview of the present invention, and in order to facilitate implementation according to the present description, the technical means of the present invention are clearly shown and described, the following is a preferred embodiment example of the present invention and is described in detail with reference to the accompanying drawings:
drawings
FIG. 1 is a schematic view of a temporary support unit in a supporting state
FIG. 2 is a schematic view of the temporary support assembly of the present invention as the front frame is retracted and advanced
FIG. 3 is a schematic view of a temporary support unit according to the invention
FIG. 4 is a schematic view showing the connection of the front frame and the rear frame of the temporary support unit of the present invention
FIG. 5 is a schematic view of the connection of the roof beam and four posts of the temporary support of the present invention
FIG. 6 is a schematic diagram of a four-column peak-by-peak bidirectional asynchronous coupling leveling control system and method according to the present invention
FIG. 7 is a schematic diagram of an adjacent cross-coupled controller of the present invention
In the figure:
1. front frame 2 of temporary support unit and rear frame of temporary support unit
3. Top beam 4. Support column
5. Push cylinder 6. Front base
7. Rear base 8 side support hydraulic cylinder
9. Slider arm 10. Slider
11. Side support plate
Detailed Description
In order to further explain the technical scheme adopted by the invention designed to achieve the preset aim of the invention in detail, the following is a structure, a specific implementation and a flow of the fully-mechanized roadway temporary support unit capable of asynchronously coupling and leveling, which are provided by the invention, by combining the accompanying drawings and a preferred embodiment, and the detailed description is as follows:
as shown in FIG. 1, the support state structure of the asynchronous coupling leveling type temporary support unit for the transition of the fully mechanized roadway is shown, and FIG. 2 shows the state of the temporary support unit when the front frame is contracted and moved forward; the temporary support unit can be independently provided with one or more groups so as to meet the requirements of temporary supports of roadways with different lengths. The temporary support unit consists of a front frame (1) and a rear frame (2), wherein the front frame and the rear frame are connected through a pushing oil cylinder as shown in fig. 4. The structure of the single temporary support front frame (1) is shown in fig. 3, and the structure of the single temporary support front frame is composed of a top beam (3), a supporting upright post (4), a pushing hydraulic cylinder (5), a base (6) and a side supporting mechanism; the side supporting mechanism consists of a hydraulic cylinder (8), a sliding block arm (9), a sliding block (10) and a side supporting plate (11).
The process flow of the pushing step type temporary support unit comprises the following steps: the normal supporting state is shown in figure 1, and the vertical and horizontal directions are both unfolding states, so that the top plate and the two sides are respectively supported. When the roadway moves forwards, the hydraulic support upright post (4) of the temporary support front frame (1) is depressurized and contracted, and meanwhile, the side support hydraulic cylinder contracts to drive the side support mechanism to be separated from the left side wall and the right side wall, so that the front frame is in a contracted state. The back frame supporting top bottom plate is in a fixed state, the pushing hydraulic oil cylinder stretches to push the temporary support front frame (1) to move forward to reach the working state in fig. 2, and the schematic diagram of the temporary support unit when the front frame contracts and moves forward is shown in fig. 2. Then, the front frame stretches to support the top plate and the two sides, the rear frame descends to shrink, the hydraulic oil cylinder is pushed to shrink forwards to drive the rear frame to move forwards, the rear frame moves forwards and stretches to support, a frame moving work flow is completed, the supporting state of fig. 1 is achieved, the cycle is continued, and the rear frame moves forwards along with the tunneling surface.
As shown in fig. 4, the pushing hydraulic oil cylinder is in ball hinge connection with the front frame base (6) and the rear frame base (7), so that the multi-degree-of-freedom moving frame of the front and rear frames in the non-horizontal roadway is ensured. As shown in fig. 5, the upright posts of the supporting hydraulic cylinder are in ball hinge connection with the top plate of the support, so that the structural requirement of asynchronous movement of four upright posts is met when the bottom plate of the non-horizontal roadway is sunken or raised.
Aiming at the temporary support unit structure provided by the invention, a structural block diagram of a four-column highest-point-by-highest-point bidirectional asynchronous coupling leveling control system and method is designed, as shown in fig. 6, and the system and method are specifically described as follows:
firstly, designing a bidirectional asynchronous leveling system and a method for the highest points: when 4 action points of the supporting upright post hydraulic cylinder and the top beam of the supporting upright post hydraulic cylinder are not on the same horizontal plane due to the working condition of a non-horizontal bottom plate, one action point position of the 4 action points is located at the highest position of the horizontal plane compared with the other 3 action points, at the moment, the output displacement of the supporting upright post hydraulic cylinder corresponding to the action point is kept still, and the other 3 supporting upright post hydraulic cylinders are lifted to the horizontal height corresponding to the highest action point, so that the pose of the bidirectional asynchronous support is leveled by the highest point. In the process of leveling the pose of the support upright column hydraulic cylinder, a high-precision long-stroke displacement sensor is arranged in the lower cavity of the hydraulic cylinder to measure the output displacement information of each hydraulic cylinder, and a strapdown inertial navigation sensor is arranged on the lower end surface of the top beam to detect the pose change phenomenon of the self-moving temporary support. The strapdown inertial navigation sensor transmits the formed potential difference signal to the D/A converter through the connecting circuit, the decoded analog quantity is transmitted to the industrial control computer to be resolved and output the adjustment displacement of each hydraulic cylinder, then the support controller controls the valve position to change, high-pressure oil is transmitted to the lower cavity of the hydraulic cylinder until the displacement sensor monitors the displacement of the hydraulic cylinder to reach the expected output displacement value of the hydraulic cylinder calculated by the industrial control computer, meanwhile, the oil in the upper cavity of the hydraulic cylinder enters the main liquid return pipe through the control valve and returns to the liquid tank, and finally each hydraulic cylinder rises to the highest point according to the resolving displacement of the industrial control computer to realize non-delamination support of the temporary support.
And then, an adjacent cross coupling control structure driven by multiple hydraulic cylinders is designed to carry out tracking control on the self tracking error of the multi-cylinder driving system and the synchronous error of the adjacent hydraulic cylinders, which is called as an asynchronous coupling leveling control method of a temporary bracket. As shown in FIG. 7, the adjacent cross coupling control structure driven by four hydraulic cylinders of the invention sets the actual output displacement of the ith support upright hydraulic cylinder in the multi-cylinder driving system at a certain moment as y i (t) the output displacement of the i-1 th and i+1 th of two adjacent cylinders is y i-1 (t) and y i+1 (t) desired input Signal r i (t) is the desired displacement of the ith support column hydraulic cylinder; the tracking error e of the i-th hydraulic cylinder itself i (t)＝r(t)-y i (t) synchronization error e of the ith hydraulic cylinder and the (i-1) th hydraulic cylinder adjacent thereto i,i-1 (t)＝y i (t)-y i-1 (t) synchronization error e of the ith hydraulic cylinder and the (i+1) th hydraulic cylinder adjacent thereto i,i+1 (t)＝y i (t)-y i+1 And (t) controlling the self tracking error of the four-column hydraulic cylinder and the synchronous error of the adjacent hydraulic cylinders through the structure, wherein the error can be controlled to be 2mm, so that the temporary support can rapidly and effectively support the roadway top and bottom plates under different geological conditions, and reliable guarantee is provided for safe and efficient underground operation of the coal roadway.
The invention is not described in part in the known technology of those skilled in the art.
The patent protection request is made in the present invention for various equivalent substitutions and modifications made without departing from the spirit and principle of the present invention, and it is intended to be covered in the scope of the present invention.
Claims (5)
1. The temporary support unit is characterized in that the temporary support unit structurally meets four-upright asynchronous coupling leveling control and multi-degree-of-freedom pushing step type moving frame, and is further characterized in that the temporary support unit is provided with a four-upright highest-point bidirectional asynchronous coupling leveling control system.
2. The comprehensive digging roadway pushing and stepping type temporary support unit capable of being asynchronously coupled and leveled according to claim 1 is structurally characterized by comprising a front hydraulic support and a rear hydraulic support which are four-upright posts, wherein the two hydraulic supports are connected through a spherical hinge type pushing oil cylinder, so that the multi-degree-of-freedom automatic moving frame in a pushing and stepping mode in the temporary support process can be realized, and the front support base and the rear support base can move in a non-same horizontal plane when a roadway is sunken or raised. The single four-column hydraulic support structure comprises five parts, namely a top beam, four column parts, a side supporting mechanism, a base and a pushing cylinder. The top beam is connected with the four upright posts through a spherical hinge structure, so that the asynchronous telescopic and leveling of the four upright posts of the support is structurally met. The side supporting structure is a telescopic supporting structure with a single hydraulic cylinder matched with double slide block arms, and is composed of the side supporting hydraulic cylinders, the slide block arms, the slide blocks and the side supporting plates, the slide block arms are connected with the supporting plates and the side hydraulic cylinders through the slide blocks, and extend and support to two sides under the telescopic driving of the hydraulic cylinders, so that the surrounding rock supporting requirements of roadways with different sizes are met.
3. The four-column highest-point asynchronous coupling leveling control system according to claim 1, wherein a four-column hydraulic support highest-point asynchronous leveling control system and a four-hydraulic cylinder system adjacent cross coupling control system are adopted, and the two systems are combined to realize rapid and stable non-delamination support of a single support under a non-horizontal roadway.
4. A four-column hydraulic support peak-by-peak asynchronous leveling control system according to claim 3, wherein a displacement sensor is respectively installed in four column cylinders of a single support for detecting the displacement expansion and contraction amount of the single column, and a strapdown inertial navigation sensor is installed under each support top beam for detecting the pose change of the support top beam. The bidirectional asynchronous control method for the highest points is that when 4 action points of the upright column hydraulic cylinder and the top beam are not on the same horizontal plane due to the working condition of a non-horizontal bottom plate, one action point position of the 4 action points is in the highest position of the horizontal plane compared with the other 3 action points, at the moment, the output displacement of the supporting upright column hydraulic cylinder corresponding to the action point is kept still, and the other 3 supporting upright columns are lifted to the horizontal height corresponding to the highest action point according to the pose information detected by the inertial sensor.
5. A four-cylinder system adjacent cross-coupling control system according to claim 3, wherein the adjacent cross-coupling control structure driven by multiple cylinders is used for tracking and controlling the tracking error of the multi-cylinder driving system and the synchronization error of the adjacent cylinders, and the principle of the adjacent cross-coupling control is as follows: let the actual output displacement of the ith support column hydraulic cylinder in the multi-cylinder driving system at a certain moment be y i (t) the output displacement of the i-1 th and i+1 th of two adjacent cylinders is y i-1 (t) and y i+1 (t) Desired input signal r i (t) is the desired displacement of the ith support column hydraulic cylinder; the tracking error e of the i-th hydraulic cylinder itself i (t)＝r(t)-y i (t) synchronization error e of the ith hydraulic cylinder and the (i-1) th hydraulic cylinder adjacent thereto i,i-1 (t)＝y i (t)-y i-1 (t) synchronization error e of the ith hydraulic cylinder and the (i+1) th hydraulic cylinder adjacent thereto i,i+1 (t)＝y i (t)-y i+1 And (t) controlling the self tracking error of the four-column hydraulic cylinder and the synchronization error of the adjacent hydraulic cylinders through the structure, wherein the error can be controlled to be 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310462204.6A CN116480395A (en) | 2023-04-26 | 2023-04-26 | Comprehensive digging roadway temporary support unit capable of being asynchronously coupled and leveled |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310462204.6A CN116480395A (en) | 2023-04-26 | 2023-04-26 | Comprehensive digging roadway temporary support unit capable of being asynchronously coupled and leveled |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116480395A true CN116480395A (en) | 2023-07-25 |
Family
ID=87213478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310462204.6A Pending CN116480395A (en) | 2023-04-26 | 2023-04-26 | Comprehensive digging roadway temporary support unit capable of being asynchronously coupled and leveled |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116480395A (en) |
-
2023
- 2023-04-26 CN CN202310462204.6A patent/CN116480395A/en active Pending
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