CN217151984U - Automatic lapping control system of intelligent anchor rod drilling machine - Google Patents

Automatic lapping control system of intelligent anchor rod drilling machine Download PDF

Info

Publication number
CN217151984U
CN217151984U CN202220481461.5U CN202220481461U CN217151984U CN 217151984 U CN217151984 U CN 217151984U CN 202220481461 U CN202220481461 U CN 202220481461U CN 217151984 U CN217151984 U CN 217151984U
Authority
CN
China
Prior art keywords
motor
lapping
controller
lifting
sleeve
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
Application number
CN202220481461.5U
Other languages
Chinese (zh)
Inventor
孙峰
焦晓峰
李红波
贾运红
程凤霞
任晓文
张晓峰
张金
王光肇
高鹏
马祺杰
王婵娟
张凯
靳明智
李斌
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.)
China Coal Huajin Group Co ltd
Taiyuan Institute of China Coal Technology and Engineering Group
Shanxi Tiandi Coal Mining Machinery Co Ltd
Original Assignee
China Coal Huajin Group Co ltd
Taiyuan Institute of China Coal Technology and Engineering Group
Shanxi Tiandi Coal Mining Machinery 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 China Coal Huajin Group Co ltd, Taiyuan Institute of China Coal Technology and Engineering Group, Shanxi Tiandi Coal Mining Machinery Co Ltd filed Critical China Coal Huajin Group Co ltd
Priority to CN202220481461.5U priority Critical patent/CN217151984U/en
Application granted granted Critical
Publication of CN217151984U publication Critical patent/CN217151984U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Landscapes

  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

The utility model discloses an automatic lapping control system of intelligence roofbolter relates to automatic technical field. Wherein, the system includes: the controller and the lapping mechanism are arranged on the anchor rod drilling machine; wherein, lapping mechanism includes: the device comprises a mesh support frame, a sleeve mechanism, a lifting mechanism and a base; wherein, the base is fixed on the anchor rod drilling machine; the lifting mechanism is fixed on the base; the sleeve mechanism is connected with the lifting mechanism through a first rotating part; the mesh support frame is connected with the sleeve mechanism through a second rotating component; the sleeve mechanism, the first rotating part, the second rotating part and the lifting mechanism are respectively provided with corresponding motors; the controller is connected with each motor for drive each motor, control sleeve mechanism, first rotary part, second rotary part and elevating system, handle with control lapping mechanism carries out the lapping, improve the security of anchor and protect the operation and intelligent roofbolter's lapping efficiency.

Description

Automatic lapping control system of intelligent anchor rod drilling machine
Technical Field
The utility model relates to an automatic technical field especially relates to an automatic lapping control system of intelligence roofbolter.
Background
At present, in the coal mining process, before the anchor rod drilling machine is adopted for excavating treatment, support operation needs to be carried out on an excavated area, namely, a net sheet and the like are laid above the excavated area, so that the fixing and protecting effects are achieved.
In the related art, when the mesh is laid, the mesh is carried and lifted to an area needing to be supported from the ground by manpower, and then the mesh is laid, so that the labor cost is high, the working strength is high, the efficiency is low, and the safety is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving one of the technical problems in the related art at least to a certain extent.
Therefore, the utility model discloses a first aim at provides an automatic lapping control system of intelligence roofbolter to improve roofbolter's lapping efficiency.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides an automatic lapping control system for an intelligent jumbolter, including: the controller and the lapping mechanism are arranged on the anchor rod drilling machine; wherein, lapping mechanism includes: the device comprises a mesh support frame, a sleeve mechanism, a lifting mechanism and a base; wherein the base is fixed to the jumbolter; the lifting mechanism is fixed on the base; the sleeve mechanism is connected with the lifting mechanism through a first rotating component; the mesh support frame is connected with the sleeve mechanism through a second rotating component; the sleeve mechanism, the first rotating part, the second rotating part and the lifting mechanism are respectively provided with corresponding motors; the controller is connected with each motor and is used for driving each motor, and the controller controls the sleeve mechanism, the first rotating part, the second rotating part and the lifting mechanism so as to control the lapping mechanism to carry out lapping treatment.
Furthermore, a motor corresponding to the sleeve mechanism is a telescopic motor and is used for telescopic control over the sleeve mechanism; the motor corresponding to the first rotating component is a rotating motor and is used for controlling the rotation of the sleeve mechanism; the motor corresponding to the second rotating part is a leveling motor and is used for leveling the mesh support frame; and the motor corresponding to the lifting mechanism is a lifting motor and is used for controlling the lifting of the sleeve mechanism.
Further, the lapping mechanism further comprises: a solenoid valve set for connecting the controller and each of the motors; the number of the electromagnetic valves in the electromagnetic valve group is consistent with that of the motors, and the electromagnetic valves are used for driving the motors respectively.
Furthermore, angle sensors are respectively arranged on the rotating motor and the leveling motor; the controller is respectively connected with the two angle sensors and used for controlling the rotary motor and the leveling motor according to angle data acquired by the two angle sensors.
Furthermore, displacement sensors are respectively arranged on the lifting motor and the telescopic motor; the controller is respectively connected with the two displacement sensors and is used for controlling the lifting motor and the telescopic motor according to displacement data acquired by the two displacement sensors.
Further, the automatic lapping control system of intelligent jumbolter still includes: the system comprises a main control box and a human-computer interaction interface connected with the main control box; the main control box is connected with the controller and used for acquiring the related data of the lapping mechanism sent by the controller and displaying the related data on the human-computer interaction interface.
Further, the automatic lapping control system of intelligent jumbolter still includes: a receiver; the receiver is connected with the main control box and used for receiving a lapping starting instruction transmitted by a remote control transmitter and transmitting the lapping starting instruction to the controller through the main control box so as to control the lapping mechanism.
Furthermore, the meshes laid on the mesh support frame are rhombic woven meshes or reinforcing meshes.
Further, the rotation motor and the leveling motor are hydraulic motors; the telescopic motor and the lifting motor are hydraulic oil cylinders.
Further, the controller is connected with the master control box through a wireless network.
According to the utility model provides a pair of automatic lapping control system of intelligence roofbolter, include: the controller and the lapping mechanism are arranged on the anchor rod drilling machine; wherein, lapping mechanism includes: the device comprises a mesh support frame, a sleeve mechanism, a lifting mechanism and a base; wherein, the base is fixed on the jumbolter; the lifting mechanism is fixed on the base; the sleeve mechanism is connected with the lifting mechanism through a first rotating part; the mesh support frame is connected with the sleeve mechanism through a second rotating part; the sleeve mechanism, the first rotating part, the second rotating part and the lifting mechanism are respectively provided with corresponding motors; the controller is connected with each motor for drive each motor, control sleeve mechanism, first rotary part, second rotary part and elevating system, handle with control lapping mechanism carries out the lapping, improve the security of anchor and protect the operation and intelligent roofbolter's lapping efficiency.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an intelligent jumbolter automatic lapping control system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a mesh laying mechanism in an automatic mesh laying control system of an intelligent jumbolter according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another automatic mesh laying control system of an intelligent jumbolter according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.
The following describes an automatic mesh laying control system and method of an intelligent jumbolter according to an embodiment of the present invention with reference to fig. 1 to 3.
As in fig. 1-3, in order to achieve the above object, an embodiment of the present invention provides an automatic lapping control system for an intelligent jumbolter, as shown in fig. 1, in the present disclosure, the automatic lapping control system 1 for an intelligent jumbolter includes: a controller 11 and a lapping mechanism 12 arranged on the jumbolter; wherein, lapping mechanism 12 includes: a mesh support frame 121, a sleeve mechanism 122, a lifting mechanism 123 and a base 124; wherein the base 124 is fixed to the jumbolter; the lifting mechanism 123 is fixed on the base 124; the sleeve mechanism 122 is connected with the lifting mechanism 123 through a first rotating component 125; the mesh support frame 121 is connected with the sleeve mechanism 122 through a second rotating member 126; the sleeve mechanism 122, the first rotating member 125, the second rotating member 126, and the lifting mechanism 123 are provided with corresponding motors 127; the controller 11 is connected to each motor 127, and drives each motor to control the sleeve mechanism 122, the first rotating member 125, the second rotating member 126, and the lifting mechanism 123, so as to control the lapping mechanism to perform the lapping process.
The motor corresponding to the sleeve mechanism 122 is a telescopic motor, and is used for performing telescopic control on the sleeve mechanism 122; the motor corresponding to the first rotating member 125 is a rotary motor for controlling the rotation of the sleeve mechanism 122; the motor corresponding to the second rotating part 126 is a leveling motor, and is used for leveling the mesh support frame 121; the motor corresponding to the lifting mechanism 123 is a lifting motor, and is used for controlling the lifting of the sleeve mechanism 122.
Wherein, the net sheets laid on the net sheet support frame are rhombic woven meshes or reinforcing meshes. The rotation motor and leveling motor are hydraulic motors 1271; the telescoping motor and the lift motor are hydraulic rams 1272.
In the disclosure, the controller 11 is configured to control the sleeve mechanism 122, the first rotating component 125, the second rotating component 126, and the lifting mechanism 123 to move, and further control the mesh supporting frame 121 to move from the initial position to the target position, and further control the lapping mechanism 12 to perform automatic lapping work; the mesh laying mechanism 12 is used for conveying meshes and steel belts to an area needing to be supported in front of the anchor drilling machine; the mesh support frame 121 is used for supporting meshes; the sleeve mechanism 122 is used for the mesh sheet support frame to move horizontally; the lifting mechanism 123 is used for the mesh support frame to move vertically; the base 124 is used for connecting the jumbolter with the lapping mechanism; the first rotating member 125 is used for the rotation process of the sleeve mechanism; the second rotating member 126 is used for leveling the mesh support frame.
Fig. 2 is the embodiment of the utility model provides a structural schematic diagram of lapping mechanism among automatic lapping control system of intelligence roofbolter.
As shown in fig. 2, the lapping mechanism 12 further includes: a solenoid valve block 128 for connecting the controller 11 and each motor; the number of the electromagnetic valves in the electromagnetic valve group is consistent with that of the motors, and the electromagnetic valves are used for driving the motors respectively.
The rotary motor and the leveling motor are respectively provided with an angle sensor 16; and the controller 11 is respectively connected with the two angle sensors 16 and is used for controlling the rotating motor and the leveling motor according to the angle data acquired by the two angle sensors. Displacement sensors 17 are respectively arranged on the lifting motor and the telescopic motor; and the controller 11 is respectively connected with the two displacement sensors 17 and is used for controlling the lifting motor and the telescopic motor according to displacement data acquired by the two displacement sensors.
Specifically, the controller 11 acquires angle data acquired by the angle sensor 16 and displacement data acquired by the displacement sensor 17, and controls the on/off state of each solenoid valve in the solenoid valve group 128 according to the acquired angle data and displacement data, thereby controlling and processing the rotation motor, the leveling motor, the lifting motor, and the telescopic motor.
In the present disclosure, the process of the controller 11 controlling the lapping mechanism 12 may be: when the controller receives a mesh laying starting instruction, determining whether a mesh support frame in a mesh laying mechanism arranged on the anchor rod drilling machine is located at an initial position, and controlling the mesh laying mechanism to move after determining that the mesh support frame is located at the initial position; the angle sensor collects angle data of the rotary motor and the leveling motor, and the displacement sensor collects displacement data of the lifting motor and the telescopic motor; the controller acquires data information acquired by the sensors and controls the rotary motor, the leveling motor, the lifting motor and the telescopic motor according to the acquired data information, so that the sleeve mechanism, the first rotating part, the second rotating part and the lifting mechanism are controlled and processed to move the mesh support frame from an initial position to a target position; the controller controls the mesh support frame to carry out lapping treatment.
In addition, after the mesh support frame reaches the target position, the mesh is separated from the mesh support frame of the mesh laying mechanism, and the anchor drilling machine anchors the mesh on the top plate to complete anchoring work; after the anchoring work is finished, the controller controls the mesh laying mechanism to move so that the mesh support frame returns to the initial position, and therefore one-time automatic mesh laying work cycle is finished. The operator places the mesh again and enters the next automatic lapping cycle.
The utility model provides an automatic lapping control system of intelligence roofbolter, include: the controller and the lapping mechanism are arranged on the anchor rod drilling machine; wherein, lapping mechanism includes: the device comprises a mesh support frame, a sleeve mechanism, a lifting mechanism and a base; wherein, the base is fixed on the jumbolter; the lifting mechanism is fixed on the base; the sleeve mechanism is connected with the lifting mechanism through a first rotating part; the mesh support frame is connected with the sleeve mechanism through a second rotating component; the sleeve mechanism, the first rotating part, the second rotating part and the lifting mechanism are respectively provided with a corresponding motor; the controller is connected with each motor for drive each motor, control sleeve mechanism, first rotary part, second rotary part and elevating system, handle with control lapping mechanism carries out the lapping, improve the security of anchor and protect the operation and intelligent roofbolter's lapping efficiency.
Fig. 3 is a schematic structural diagram of another automatic mesh laying control system of an intelligent jumbolter according to an embodiment of the present invention.
Automatic lapping control system 1 of intelligence roofbolter still includes: a main control box 13 and a human-computer interaction interface 14 connected with the main control box; the main control box 13 is connected to the controller 11, and is configured to obtain related data of the network laying mechanism sent by the controller, and display the related data on the human-computer interaction interface.
Wherein, automatic lapping control system 1 of intelligence roofbolter still includes: a receiver 15; the receiver 15 is connected to the master control box 13, and is configured to receive a lapping start instruction transmitted by the remote control transmitter, and send the lapping start instruction to the controller 11 through the master control box 13, so as to control the lapping mechanism. The controller 11 and the master box 13 are connected by a wireless network.
Specifically, the receiver 15 receives a network-laying start instruction sent by the remote control transmitter; the main control box 13 receives a lapping start instruction of the receiver and sends the lapping start instruction to the controller 11; the controller 11 controls the movement of the lapping mechanism and simultaneously sends the data of the lapping mechanism to the main control box 13; the man-machine interface 14 acquires data sent to the main control box 13 by the controller 11 and displays the data on an upper computer interface of the explosion-proof computer.
Wherein, the controller is to the relevant data of lapping mechanism that master control box sent, includes: motor data, sensor data, mesh support frame position data, action signal data of the electromagnetic valve group and the like; the motor data includes: the flow, pressure, displacement, rotating speed and power of the hydraulic motor, and the pressure, flow, piston stroke, piston movement speed and power of the hydraulic oil cylinder; the sensor data includes: the rotation angle of the rotary motor, the leveling angle of the leveling motor, the telescopic displacement of the telescopic motor and the lifting displacement of the lifting motor; the position data of the mesh support frame comprises: initial position motor parameters, motor parameters of a target position, and motor parameter information of at least one intermediate position; the operation signal data of the solenoid valve group includes: and (5) on-off state of the electromagnetic valve group.
In this disclosure, the process of communicating between the controller 11 and the master control box 13 may be as follows: the remote control transmitter sends a lapping starting instruction, the receiver receives the lapping starting instruction and sends the lapping starting instruction to the main control box, the main control box sends the lapping starting instruction to the controller, the controller receives the lapping starting instruction and then controls the lapping mechanism to carry out lapping work, the controller acquires relevant data of the lapping mechanism and sends the relevant data to the main control box, and the human-computer interaction interface acquires and displays the relevant data of the lapping mechanism.
The utility model provides an automatic lapping control system of intelligence roofbolter, include: the controller and the lapping mechanism are arranged on the anchor rod drilling machine; wherein, lapping mechanism includes: the device comprises a mesh support frame, a sleeve mechanism, a lifting mechanism and a base; wherein, the automatic lapping control system of intelligence roofbolter can also include: the system comprises a main control box, a receiver and a human-computer interaction interface connected with the main control box; the main control box is connected with the controller and used for acquiring related data of the lapping mechanism sent by the controller and displaying the related data on the human-computer interaction interface; the receiver is connected with the main control box and used for receiving the lapping starting instruction transmitted by the remote control transmitter and sending the lapping starting instruction to the controller through the main control box so as to control the lapping mechanism and further control the lapping mechanism to carry out lapping treatment, thereby improving the safety of anchoring operation and the lapping efficiency of the intelligent anchor rod drilling machine.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides an automatic lapping control system of intelligence roofbolter which characterized in that includes:
the controller and the lapping mechanism are arranged on the anchor rod drilling machine; wherein, lapping mechanism includes: the device comprises a mesh support frame, a sleeve mechanism, a lifting mechanism and a base;
wherein the base is fixed to the jumbolter; the lifting mechanism is fixed on the base; the sleeve mechanism is connected with the lifting mechanism through a first rotating component; the mesh support frame is connected with the sleeve mechanism through a second rotating component;
the sleeve mechanism, the first rotating part, the second rotating part and the lifting mechanism are respectively provided with corresponding motors;
the controller is connected with each motor and is used for driving each motor, and the controller controls the sleeve mechanism, the first rotating part, the second rotating part and the lifting mechanism so as to control the lapping mechanism to carry out lapping treatment.
2. The system according to claim 1, wherein the motor corresponding to the sleeve mechanism is a telescopic motor for performing telescopic control on the sleeve mechanism;
the motor corresponding to the first rotating component is a rotating motor and is used for controlling the rotation of the sleeve mechanism;
the motor corresponding to the second rotating part is a leveling motor and is used for leveling the mesh support frame;
and the motor corresponding to the lifting mechanism is a lifting motor and is used for controlling the lifting of the sleeve mechanism.
3. The system of claim 1 or 2, wherein the lapping mechanism further comprises: a solenoid valve set for connecting the controller and each of the motors;
the number of the electromagnetic valves in the electromagnetic valve group is consistent with that of the motors, and the electromagnetic valves are used for driving the motors respectively.
4. The system of claim 2, wherein the rotary motor and the leveling motor are each provided with an angle sensor thereon;
the controller is respectively connected with the two angle sensors and used for controlling the rotary motor and the leveling motor according to angle data acquired by the two angle sensors.
5. The system of claim 2, wherein displacement sensors are disposed on the lift motor and the reach motor, respectively;
the controller is respectively connected with the two displacement sensors and is used for controlling the lifting motor and the telescopic motor according to displacement data acquired by the two displacement sensors.
6. The system of claim 1, further comprising: the system comprises a main control box and a human-computer interaction interface connected with the main control box;
the main control box is connected with the controller and used for acquiring the related data of the lapping mechanism sent by the controller and displaying the related data on the human-computer interaction interface.
7. The system of claim 6, further comprising: a receiver;
the receiver is connected with the main control box and used for receiving a lapping starting instruction transmitted by a remote control transmitter and transmitting the lapping starting instruction to the controller through the main control box so as to control the lapping mechanism.
8. The system of claim 1, wherein the mesh laid on the mesh support frame is a diamond-shaped woven mesh or a steel mesh.
9. The system of claim 2, wherein the rotation motor and the leveling motor are hydraulic motors;
the telescopic motor and the lifting motor are hydraulic oil cylinders.
10. The system of claim 6, wherein the controller is coupled to the master control box via a wireless network.
CN202220481461.5U 2022-03-07 2022-03-07 Automatic lapping control system of intelligent anchor rod drilling machine Active CN217151984U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220481461.5U CN217151984U (en) 2022-03-07 2022-03-07 Automatic lapping control system of intelligent anchor rod drilling machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220481461.5U CN217151984U (en) 2022-03-07 2022-03-07 Automatic lapping control system of intelligent anchor rod drilling machine

Publications (1)

Publication Number Publication Date
CN217151984U true CN217151984U (en) 2022-08-09

Family

ID=82693409

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202220481461.5U Active CN217151984U (en) 2022-03-07 2022-03-07 Automatic lapping control system of intelligent anchor rod drilling machine

Country Status (1)

Country Link
CN (1) CN217151984U (en)

Similar Documents

Publication Publication Date Title
CN105002943A (en) Control system and method of working device of remote control bulldozer
CN217151984U (en) Automatic lapping control system of intelligent anchor rod drilling machine
CN112987624A (en) Automatic pile pressing control system and control method for engineering machinery
CN101886544B (en) Hinge system for shield machine and control method thereof
CN111749235A (en) Auxiliary piling system and pile driver with same
CN209040747U (en) A kind of double power vehicle-mounted drilling and repairing machine
CN102259394B (en) Splitter
CN104828738A (en) Indoor transformer bell cover hoisting device
CN103148060B (en) Step on lift control system and the controlling method of car staircase
CN105040697A (en) Drop hammer type automatic pile driver control system based on single-chip microcomputer
CN104495651A (en) Automatic synchronous bottom oil cylinder jacking and lowering device of crawling crane
CN108726381B (en) Multi-arm coordination operation control system of multifunctional rescue vehicle
JP2002351533A (en) Civil engineering machine system
CN105836659A (en) Working method of good-performance large transformer bell housing indoor on-site vertical lifting device
CN207463514U (en) Intelligent spray system
CN104843614A (en) Multi-dimensional comprehensive lifting device for transformer assembly
CN212799423U (en) Synchronous jacking system of electric shovel maintenance PLC
CN212863850U (en) Concrete prefabricated part hoist
CN211370438U (en) Intelligent construction system for limited space operation
CN204689544U (en) Transformer device multi-direction synthetic lifting appliance
CN113931669A (en) Anchor rod supporting method based on automatic drilling rig
CN112177588A (en) Pile machine intelligent construction control system and working method
CN112465103A (en) Automatic counting rammer and counting method
CN214616583U (en) Automatic arch frame lifting device for cantilever type tunneling machine
CN205617379U (en) A vehicular diesel pile driver for maintenance of oil gas field well head

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant