CN214997606U - Automatic drilling monitoring device of drilling machine, drill bit mechanism and drill bit replacement forecasting system - Google Patents
Automatic drilling monitoring device of drilling machine, drill bit mechanism and drill bit replacement forecasting system Download PDFInfo
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- CN214997606U CN214997606U CN202120544692.1U CN202120544692U CN214997606U CN 214997606 U CN214997606 U CN 214997606U CN 202120544692 U CN202120544692 U CN 202120544692U CN 214997606 U CN214997606 U CN 214997606U
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Abstract
The utility model discloses an automatic drilling monitoring device, a drill bit mechanism and a drill bit replacement forecasting system of a drilling machine, wherein the monitoring device comprises a torque measuring sensor, a rotating speed sensor, a pressure sensor, a device shell, a height sensor, a data acquisition and storage module, a data signal transmitting module and a power supply module which are fixedly arranged in the device shell; the torque measuring sensor and the pressure sensor are both used for being mounted at the top of the square head of the drill rod, and the rotating speed sensor is used for being mounted on a spring tray of the drill rod; the device housing is adapted to be mounted within a drill rod. The height sensor collects the depth of the drill bit body, the torque measuring sensor measures the torque value borne by the drill bit body, the pressure sensor and the rotating speed sensor respectively measure the pressure and the rotating speed borne by the drill bit body, the construction state of the rotary drilling rig is timely and comprehensively evaluated according to the drilling data, and whether the drill bit needs to be replaced is judged.
Description
Technical Field
The utility model relates to a dig rig construction automatic monitoring technical field soon, especially relate to a rig automatic drilling monitoring devices, drill bit mechanism and drill bit change forecast system.
Background
With the rapid development of urban construction in China, higher requirements are put forward on the construction and the construction of underground engineering, and the method is particularly suitable for the aspects of engineering construction safety, economy, environmental protection and the like. The full-casing secant pile has the advantages of being flexible to adapt to various complex geological conditions, saving economy, being high in impermeability and the like as a mode of foundation pit support, so that the casing secant pile foundation is fully utilized in the aspect of application of a deep foundation pit support structure in urban construction.
However, at present, in the face of various complicated soft and hard underground strata, the construction state of the casing pipe rotary drilling machine is difficult to grasp in time, if the casing pipe rotary drilling machine suddenly encounters a hard stratum, the full casing pipe drill bit with insufficient rigidity is easy to be damaged in different degrees, so that certain economic loss can be caused, and the whole construction efficiency can be influenced. In addition, the information of the existing monitoring system and judging method is not comprehensive enough, and the final obtained result is not accurate enough.
SUMMERY OF THE UTILITY MODEL
The utility model provides a drilling machine automatic drilling monitoring devices, drill bit mechanism and drill bit change forecast system to the solution is difficult to in time master the problem of full casing drill's construction state.
In a first aspect, an automatic drilling monitoring device for a drilling machine is provided, which comprises a torque measuring sensor, a rotating speed sensor, a pressure sensor, a device shell, a height sensor, a data acquisition and storage module, a data signal transmitting module and a power supply module, wherein the height sensor, the data acquisition and storage module, the data signal transmitting module and the power supply module are fixedly arranged in the device shell;
the torque measuring sensor and the pressure sensor are both used for being mounted at the top of the square head of the drill rod, and the rotating speed sensor is used for being mounted on a spring tray of the drill rod;
the device shell is used for being installed in a drill rod, and the height sensor, the pressure sensor, the rotating speed sensor, the torque measuring sensor and the data signal transmitting module are all electrically connected with the data acquisition and storage module; the torque measuring sensor, the height sensor, the pressure sensor, the rotating speed sensor, the data acquisition and storage module and the data signal transmitting module are all electrically connected with the power supply module.
The height sensor is used for collecting the depth of the position where the height sensor is located, the torque measuring sensor is used for measuring the torque force applied to the drill bit body, the pressure sensor is used for measuring the pressure value applied to the drill bit body in the drilling process, the rotating speed sensor is used for measuring the rotating speed value of the drill bit body in the drilling process, data measured by the height sensor, the torque measuring sensor, the pressure sensor and the rotating speed sensor are uniformly transmitted to the data collecting and storing module, and the data collecting and storing module stores the received measured data and transmits the data to the ground monitoring data module through the data signal transmitting module. Before the drilling machine works, the acquisition time node or the acquisition time interval of the height sensor is preset, so that the depth value of the drill bit body and the drilling speed value can be conveniently obtained according to the acquired data measured by the height sensor, the construction state of the full-casing rotary drilling rig can be timely mastered according to the monitoring data acquired by the device and the calculation and analysis of the data, whether the drill bit needs to be replaced or not is judged according to the construction state, and the drill bit is prevented from being damaged in time.
Furthermore, a cantilever friction metal shaft is fixed at the top in the device shell, and a friction resistance sheet is further arranged at the lower end of the cantilever friction metal shaft and is respectively connected with the inner side of the device shell and the surface of the cantilever friction metal shaft.
Furthermore, the device shell is internally provided with two connecting tables, and sliding friction plates are arranged between the connecting tables and the inner side wall of the device shell and between the connecting tables and the cantilever friction metal shaft. The sliding friction plate is used for relieving impact force or vibration on the device shell and all devices in the device shell, and plays a role in protection.
The device comprises a device shell, a drill rod and a rotary table, wherein the device shell is fixedly arranged on the drill rod, the rotary table comprises an upper disc and a lower disc which can rotate relatively, the device shell is fixedly arranged on the surface of the upper disc, and the lower disc is fixedly connected with the drill rod through a transverse connecting bolt. The whole device shell is fixedly arranged on the surface of the upper disc of the turntable, the lower disc of the turntable is connected with the drill rod through the transverse connecting bolt and can rotate along with the rotation of the drill rod, and the upper disc of the turntable and the device shell fixedly arranged on the surface of the upper disc can be in a relatively static state, so that all devices in the device are protected to a certain extent.
Further, the data signal transmitting module is a wireless communication module or a wired communication module.
In a second aspect, a drill bit mechanism of a drilling machine is provided, which comprises a drill rod, a drill bit body and the automatic drilling monitoring device of the drilling machine;
the torque measuring sensor and the pressure sensor are both arranged at the top of the square head of the drill rod, the rotating speed sensor is arranged on a spring tray of the drill rod, and the device shell, the height sensor, the data acquisition and storage module, the data signal transmitting module and the power supply module which are fixedly arranged in the device shell are all arranged in the drill rod.
When the drill bit mechanism works, the construction state of the full-casing rotary drilling rig can be timely mastered through the automatic drilling monitoring device of the drilling rig, whether the drill bit needs to be replaced or not is judged according to the construction state, and the drill bit is prevented from being damaged.
In a third aspect, a drill bit replacement forecasting system of a drilling machine is provided, which comprises a ground monitoring data module and the automatic drilling monitoring device of the drilling machine; the ground monitoring data module comprises a signal receiving module, a processing module and a display screen, and the signal receiving module and the display screen are electrically connected with the processing module; the signal receiving module is used for communicating with the data signal transmitting module, and the processing module is used for calculating and deciding the received collected data and then transmitting the result to the display screen for displaying. And the processing module sends the processed data result to a display screen for displaying so that a worker can observe the construction state of the full-casing rotary drilling rig in time.
And when the processing module judges that the drill bit of the drilling machine is in a poor construction state, the processing module sends an alarm signal to the alarm, and the alarm is used for sending an alarm forecast after receiving the alarm signal. The drill bit can be automatically and timely replaced by workers.
Further, the signal receiving module is a wireless signal receiver or a wired signal receiver.
Advantageous effects
The utility model provides a drilling machine automatic drilling monitoring devices, drill bit mechanism and drill bit change forecast system, height sensor are used for gathering the degree of depth of self position, and torque measurement sensor is used for measuring the torsional forces size on the drill bit body, and pressure sensor is used for measuring the pressure value size that the drill bit body received at the in-process that creeps into, and revolution speed sensor is used for measuring the rotational speed value size that the drill bit body bored. The data measured by the height sensor, the pressure sensor, the rotating speed sensor and the torque measuring sensor are uniformly transmitted to the data acquisition and storage module, and the data acquisition and storage module stores the received measured data and transmits the data to the ground monitoring data module through the data signal transmitting module.
Before working, the acquisition time nodes or the acquisition time intervals of the height sensor and the torque measurement sensor are preset, so that the depth value of the drill bit body and the drilling speed value can be conveniently obtained according to the acquired data measured by the height sensor, and the construction state of the full casing drilling machine can be timely mastered according to the data acquired by the torque measurement sensor, the pressure sensor and the rotating speed sensor, whether the drill bit needs to be replaced or not is judged according to the construction state, and the drill bit is timely prevented from being damaged. The utility model discloses a simple structure, the operation is swift, and the data accuracy that provides is high, and the construction of digging the rig soon for the full sleeve pipe provides the safety guarantee.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, 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 structural diagram of a drill rod and bit body mechanism device of a drilling machine provided by an embodiment of the invention;
FIG. 2 is a schematic structural view of a drill rod mechanism device provided by an embodiment of the present invention;
fig. 3 is a schematic structural plan view of a first connection table apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a drill rod and bit body mechanism of a drilling machine provided by an embodiment of the invention;
fig. 5 is a schematic structural diagram of a ground monitoring data module according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a data monitoring structure provided by an embodiment of the present invention.
Description of reference numerals:
1. a power supply module; 2. sliding the friction plate; 3. sliding the friction plate; 4. a friction plate; 5. sliding the friction plate; 6. sliding the friction plate; 7. a torque measuring sensor; 8. a height sensor; 9. a data acquisition and storage module; 10. a data signal transmitting module; 11. a cantilever friction metal shaft; 12. a turntable; 13. a ground data monitoring module; 14. an alarm; 15. a device housing; 16. a drill rod spring; 17. a first connection station; 18. a second connecting station; 19. a processing module; 20. a signal receiving module; 21. a display screen; 22. a drill stem; 23. a rotational speed sensor; 24. a pressure sensor; 25. a bit body; 26. a pin shaft, 27 and a square head; 29. a transverse connecting bolt; 30. a spring tray; 31. and a spring lower disc.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
As shown in fig. 1 to 4, the present embodiment discloses an automatic drilling monitoring device for a drilling machine, which includes a torque measuring sensor 7, a rotation speed sensor 23, a pressure sensor 24, a device housing 15, and a height sensor 8, a data collecting and storing module 9, a data signal transmitting module 10, and a power module 1, which are fixedly disposed in the device housing 15;
the torque measuring sensor 7 and the pressure sensor 24 are used for being mounted at the top of a square head 27 of the drill rod 22, and the rotating speed sensor 23 is used for being mounted on a spring tray 30 of the drill rod 22;
the device shell 15 is used for being installed in a drill rod 22, the height sensor 8, the pressure sensor 24, the rotating speed sensor 23, the torque measuring sensor 7 and the data signal transmitting module 10 are electrically connected with the data collecting and storing module 9, and the torque measuring sensor 7, the height sensor 8, the pressure sensor 24, the rotating speed sensor 23, the data collecting and storing module 9 and the data signal transmitting module 10 are electrically connected with the power module 1.
The height sensor 8 is used for acquiring the depth of the position where the height sensor is located, the torque measuring sensor 7 is used for measuring the torque force borne by the bit body 25, the pressure sensor 24 is used for measuring the pressure value borne by the bit body 25 in the drilling process, the rotating speed sensor 23 is used for measuring the rotating speed value of the drilling of the bit body 25, data measured by the height sensor 8, the torque measuring sensor 7, the pressure sensor 24 and the rotating speed sensor 23 are uniformly transmitted to the data acquisition and storage module 9, and the data acquisition and storage module 9 stores the received measured data and transmits the data to the ground monitoring data module 13 through the data signal transmitting module 10. Before working, the acquisition time node or the acquisition time interval of the height sensor 8 is preset, so that the depth value of the drill bit body 25 and the drilling speed value can be conveniently obtained according to the acquired data measured by the height sensor 8, the construction state of the full-casing rotary drilling rig can be timely mastered according to the monitoring data acquired by the device and the calculation and analysis of the data, whether the drill bit needs to be replaced or not is judged according to the construction state, and the drill bit is timely prevented from being damaged.
Specifically, a cantilever friction metal shaft 11 is fixed at the top end in the device shell 15, a friction resistance sheet 4 is further arranged at the lower end of the cantilever friction metal shaft 11, and the friction resistance sheet 4 is respectively connected with the inner side of the device shell 15 and the surface of the friction metal shaft 11. The friction resistance sheet 4 may enhance the stability of the device housing 15 and the components therein. In this embodiment, as shown in fig. 1 and 2, two connecting tables are further disposed inside the device housing 15, and sliding friction plates 2, 5, 3, and 6 are disposed between the connecting tables 17 and 18 and the inner side wall of the device housing 15 and between the connecting tables 17 and 18 and the cantilever friction metal shaft 11. The friction resistance plate 4 and the sliding friction plates 2, 5, 3 and 6 are used for buffering the impact force or vibration on the device shell 15 and various devices in the device shell, so that the device shell plays a role in protection, and the service life of the devices is prolonged.
In this embodiment, the device further comprises a rotary table 12, the rotary table 12 comprises an upper disc and a lower disc which can rotate relatively, the device housing 15 is fixedly installed on the surface of the upper disc, and the lower disc is fixedly connected with the drill rod 22 through a transverse connecting bolt 29. The entire device housing 15 is fixedly mounted on the upper disc surface of the rotary disc 12, the lower disc of the rotary disc can rotate along with the drill rods 22, and the upper disc and the device housing 15 fixed on the upper disc surface can be in a relatively static state, thereby protecting various devices inside the device to a certain extent.
In this embodiment, as shown in fig. 1 and fig. 3, the first connecting station 17 and the second connecting station 18 are further respectively provided with a power module 1, a data collecting and storing module 9, a data signal transmitting module 10 and a height sensor 8, it should be understood that the data collecting and storing module 9, the data signal transmitting module 10, the height sensor 8 and the power module 1 are not fixed in the vertical sequence, and can be adjusted and arranged smoothly or arranged side by side according to actual needs, and the data signal transmitting module 10 can be selected as a wireless communication module or a wired communication module according to needs.
Example 2
As shown in fig. 1 to 6, the present embodiment provides a drill bit mechanism of a drilling machine, which includes a drill rod 22, a drill bit body 25, and the above-mentioned automatic drilling monitoring device of a drilling machine, wherein the torque measuring sensor 7 is installed at the interface between the upper end of the square head 27 of the drill rod 22 and the drill rod spring 16, and the device housing 15, the height sensor 8, the data acquisition and storage module 9, the data signal transmitting module 10, and the power supply module 1 which are fixedly arranged in the device housing 15 are all arranged in the drill rod 22; the pressure sensor 24 is fixedly arranged at the interface of the top end of the square head 27 of the drill rod 22 and the drill body 25, and the rotating speed sensor 23 is fixedly arranged on the spring tray 30. Of course, the torque measuring sensor and the pressure sensor may alternatively both be embedded inside the unsprung mass 31 of the drill rod.
As shown in FIG. 4, a drill rod and bit body mechanism of a drilling machine is provided, which comprises a drill rod 22, a spring tray 30, a drill rod spring 16, a spring lower disc 31, a square head 27 and a bit body 25 from top to bottom, wherein the square head 27 is connected with the bit body 25 through a pin shaft 26. When the drill bit mechanism works, the construction state of the full casing drill can be timely mastered through the automatic drilling monitoring device of the drill, whether the drill bit needs to be replaced or not is judged according to the construction state, and the drill bit is prevented from being damaged. In this embodiment, for other specific implementation schemes, reference is made to the automatic drilling monitoring device of the drilling machine provided in embodiment 1, and details are not described herein again.
Example 3
As shown in fig. 1 to fig. 6, the present embodiment provides a drill bit replacement forecasting system for a drilling machine, which includes a ground monitoring data module 13 and the automatic drilling monitoring device of the drilling machine as described above; the ground monitoring data module 13 comprises a signal receiving module 20, a processing module 19 and a display screen 21, wherein the signal receiving module 20 and the display screen 21 are electrically connected with the processing module 19; the signal receiving module 20 is configured to communicate with the data signal transmitting module 10, and the processing module 19 is configured to calculate and decide the received acquired data, and then transmit the result to the display screen 21 for display.
The data signal transmitting module 10 transmits the depth data collected by the height sensor 8, the torque force data collected by the torque measuring sensor 7, the pressure value of the bit body 25 measured by the pressure sensor 24 and the rotating speed data of the bit body 25 measured by the rotating speed sensor 23 to the signal receiving module 20, the signal receiving module 20 receives the data and transmits the data to the processing module 19, the processing module 19 accesses the received data to the expert data system 28, the processed data is transmitted to the display screen 21 for display, such as the depth value of the bit body, the torque force value of the bit body, the pressure value of the bit body and the rotating speed value of the bit body, and the drilling speed value is obtained according to the depth value acquired at the preset time interval, so that a worker can observe the construction state of the full casing drilling machine in time, and the processing module and the display screen can be directly realized by a PC (personal computer) during specific implementation.
The ground monitoring data module 13 further comprises an alarm 14 electrically connected with the processing module, when the processing module 19 determines that the drill bit of the drilling machine is in a poor construction state (for example, when the received data exceeds a preset threshold value, the processing module determines that the drill bit is in the poor construction state), the processing module 19 sends an alarm signal to the alarm 14, and the alarm 14 is used for sending an alarm forecast after receiving the alarm signal. The drill bit can be automatically and timely replaced by workers.
The processing module 19 sends the processed data result to the display screen 21 for displaying, so that the working personnel can observe the construction state of the full casing drilling machine in time.
In practice, the signal receiving module 20 is a wireless signal receiver or a wired signal receiver. When the signal receiving module 20 is a wired signal receiver, it is connected to the data signal transmitting module 10 through a data line; when the signal receiving module 20 is a wireless signal receiver, it can be connected to the data signal transmitting module 10 through internet of things such as 3G/4G or NB-IoT.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
The automatic drilling monitoring device, the drill bit mechanism and the drill bit replacement forecasting system of the drilling machine have the advantages that:
(1) by reflecting the torque value of the drill bit body, the drilling speed value of the drill bit, the pressure value of the drill bit body and the rotating speed value of the drill bit body in real time, the working state of the rotary drilling rig can be automatically monitored, an alarm can be automatically sent out to remind of replacing the drill bit, and the working efficiency is improved.
(2) The device system can automatically collect and analyze data through the mutual work of all modules, and reduces artificial operation errors.
(3) The friction resistance sheet and the sliding friction sheet which are arranged in the device shell can protect the device module in the shell to the maximum extent, and the reliability and the service life of the device are improved.
(4) The whole set of device structure sets up simply, and the operation is swift, and the data accuracy that provides is high, provides the safety guarantee for the construction of sleeve pipe rotary drill rig.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (9)
1. An automatic drilling monitoring device of a drilling machine is characterized by comprising a torque measuring sensor, a rotating speed sensor, a pressure sensor, a device shell, a height sensor, a data acquisition and storage module, a data signal transmitting module and a power supply module, wherein the height sensor, the data acquisition and storage module, the data signal transmitting module and the power supply module are fixedly arranged in the device shell;
the torque measuring sensor and the pressure sensor are both used for being mounted at the top of the square head of the drill rod, and the rotating speed sensor is used for being mounted on a spring tray of the drill rod;
the device shell is used for being installed in a drill rod, and the height sensor, the pressure sensor, the rotating speed sensor, the torque measuring sensor and the data signal transmitting module are all electrically connected with the data acquisition and storage module; the torque measuring sensor, the height sensor, the pressure sensor, the rotating speed sensor, the data acquisition and storage module and the data signal transmitting module are all electrically connected with the power supply module.
2. The automatic drilling monitoring device of the drilling machine as claimed in claim 1, wherein a cantilever friction metal shaft is fixed at the top in the device shell, and friction resistance pieces are further arranged at the lower end of the cantilever friction metal shaft and respectively connected with the inner side of the device shell and the surface of the cantilever friction metal shaft.
3. The automatic drilling monitoring device of the drilling machine as claimed in claim 2, wherein two connecting tables are further arranged inside the device shell, and sliding friction plates are arranged between the connecting tables and the inner side wall of the device shell and between the connecting tables and the cantilever friction metal shaft.
4. The automatic drilling monitoring device of the drilling machine as recited in claim 1, further comprising a turntable, wherein the turntable comprises an upper disc and a lower disc which can rotate relatively, the device housing is fixedly mounted on the surface of the upper disc, and the lower disc is fixedly connected with the drill rod through a transverse connecting bolt.
5. The automatic drilling monitoring device of any one of claims 1 to 4, wherein the data signal transmitting module is a wireless communication module or a wired communication module.
6. A drill bit mechanism comprising a shank, a bit body and an automatic drilling monitoring device of a drilling rig according to any one of claims 1 to 5;
the torque measuring sensor and the pressure sensor are both arranged at the top of the square head of the drill rod, the rotating speed sensor is arranged on a spring tray of the drill rod, and the device shell, the height sensor, the data acquisition and storage module, the data signal transmitting module and the power supply module which are fixedly arranged in the device shell are all arranged in the drill rod.
7. A drill bit change forecasting system comprising a surface monitoring data module and an automatic drilling monitoring device of a drilling machine according to any one of claims 1 to 5; the ground monitoring data module comprises a signal receiving module, a processing module and a display screen, and the signal receiving module and the display screen are electrically connected with the processing module; the signal receiving module is used for communicating with the data signal transmitting module, and the processing module is used for processing the received collected data and then transmitting the result to the display screen for displaying.
8. The system according to claim 7, wherein the ground monitoring data module further comprises an alarm electrically connected to the processing module, when the processing module determines that the drill bit of the drilling machine is in a poor construction state, the processing module sends an alarm signal to the alarm, and the alarm is used for receiving the alarm signal and then sending an alarm forecast.
9. The drill bit replacement forecasting system of claim 7, wherein the signal receiving module is a wireless signal receiver or a wired signal receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120544692.1U CN214997606U (en) | 2021-03-17 | 2021-03-17 | Automatic drilling monitoring device of drilling machine, drill bit mechanism and drill bit replacement forecasting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120544692.1U CN214997606U (en) | 2021-03-17 | 2021-03-17 | Automatic drilling monitoring device of drilling machine, drill bit mechanism and drill bit replacement forecasting system |
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| CN214997606U true CN214997606U (en) | 2021-12-03 |
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| CN202120544692.1U Active CN214997606U (en) | 2021-03-17 | 2021-03-17 | Automatic drilling monitoring device of drilling machine, drill bit mechanism and drill bit replacement forecasting system |
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| CN (1) | CN214997606U (en) |
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2021
- 2021-03-17 CN CN202120544692.1U patent/CN214997606U/en active Active
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