CN212738466U - Continuous rod drilling type horizontal directional drill - Google Patents
Continuous rod drilling type horizontal directional drill Download PDFInfo
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- CN212738466U CN212738466U CN202021058687.1U CN202021058687U CN212738466U CN 212738466 U CN212738466 U CN 212738466U CN 202021058687 U CN202021058687 U CN 202021058687U CN 212738466 U CN212738466 U CN 212738466U
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Abstract
The utility model provides a continuous rod drilling type horizontal directional drilling and underwater unmanned cable-penetrating operation method, which realizes the continuous rod drilling construction process through a special hydraulic loading wedge-shaped clamping mechanism, the hydraulic loading wedge-shaped clamping mechanism moves towards opposite directions simultaneously under the condition of receiving the loading acting force of a hydraulic cylinder, and respectively extrudes respective corresponding wedge-shaped clamping blocks, the wedge-shaped clamping blocks receive the radial component force of the clamping sleeves and automatically clamp a continuous drill rod and keep the position relatively fixed, and under the propulsion of an embrace clamp type power head, the whole wedge-shaped clamping mechanism and the continuous drill rod are jointly rotationally propelled towards the preset direction; because the utility model discloses a, the continuous rod is bored, and the drilling rod is once only connected, need not to meet the drilling rod midway, has solved the difficult problem that horizontal drilling rig creeps into under water, realizes unmanned cable operation under water, realizes the quick threading work to sunken ship salvage in-process steel cable, solves in the original work degree of dependence to personnel high, and operating strength is big, and operating time is long, and the operating efficiency is low, influences the problem that sunken ship salvage engineering became defeated even.
Description
Technical Field
The utility model relates to an underwater sunken ship salvage technical field, specifically speaking relates to a continuous rod drilling formula horizontal directional bores and operation method.
Background
At present, the sinking ship salvage is always the threading operation of a salvage steel cable manually. The main operation process is that a diver firstly washes two mud pits at corresponding positions on two sides of a sunken ship, then the diver washes a hole in sediment at the bottom of the ship to the other side of the ship by using a mud attack device in the washed mud pits by means of the impulsive force of high-pressure water of a spray head, the pipe of the mud attack device is short due to the long ship body, and when the diver attacks a section of pipe, the diver needs to touch the direction of the mud attack device to correct the deviation in time. When the number of the sections of the sludge tapper which needs to be tapped is estimated to be totally tapped at the bottom of the ship, compressed air is connected to a joint beside the last section of the pipe, when the air is blown out from the top end of the sludge tapper, another diver can touch the top end of the sludge tapper in a sludge pit on the other side of the sunken ship and fasten a thin steel cable thereon, and the diver is informed to draw the sludge tapper and then draw the thin steel cable through the bottom of the ship. After the small steel cable is led, a thicker steel cable is connected to the end of the small steel cable to serve as a guide rope, an operator of the engineering ship is informed to wink the small steel cable to pull the guide rope through the bottom of the ship, the tail end of the guide rope is connected with a salvage steel cable, the engineering ship winches the guide rope to pull the salvage steel cable through the bottom of the ship until the two ends of the salvage steel cable are exposed beside the two sides of the sunken ship according to the specified length, and the steel cables are connected through a cable penetrating mechanism to achieve cable penetrating work.
The method is easily limited by underwater operation environment, has high dependence on personnel, has high operation intensity for divers, takes long time, often occupies more than half of the time of the whole salvage project, even is directly related to the success or failure of the salvage project, and causes great adverse effect on the salvage operation.
How to realize unmanned underwater cable threading and improve the efficiency of cable threading operation is a problem which needs to be solved urgently in the field of sunken ship salvaging, and various mechanisms also provide different solutions, for example, a patent with publication number CN108032971A discloses an underwater guide frame based on HDD cable threading technology and a working method thereof, the patent provides that a horizontal directional drilling machine technology commonly used on land is applied to the underwater sunken ship salvaging cable threading operation, a horizontal fixed drilling machine is arranged on a salvaging ship, and a cable is drilled into the bottom of the underwater sunken ship at a certain angle, in order to ensure the accuracy of the direction of a drill rod, the guide frame is arranged, theoretically, the patent can realize the cable threading operation by using the horizontal directional drilling machine, in actual operation, because the distance from the water surface to the water bottom is larger, the mud entering angle of the drill rod cannot be too large (generally cannot exceed 20 degrees), and in order to ensure a proper mud entering angle, the horizontal distance between the salvage ship and the position of the sunken ship is at least more than 1.75 times of the water depth, the horizontal drilling machine is too far away from a mud entering point, the stability and the accuracy of drilling are greatly influenced, the construction operation range is too large, the operation period of salvaging the sunken ship is often very long, the salvaging construction operation range is too large, and the blockage of a navigation channel can be further aggravated, so that the method for placing the horizontal directional drilling machine on the salvaging operation ship to carry out underwater cable penetrating operation does not meet the actual requirement of salvaging the sunken ship.
Based on this, the utility model discloses the people provides one kind and arranges horizontal drilling machine in under water and creeps into the thinking of going through the cable operation, through utility model have at the submarine horizontal drilling machine of implementing to creep into, turning to the function, realize passing sunken ship bottom according to the design requirement with the drilling rod and accomplish direction and drilling work, through the cable mechanism of hanging in drill bit the place ahead, be connected with the hawser and realize that the hawser wears to draw and back and drag work, accomplish the ship bottom and wear the cable work.
The horizontal drilling machine can work under water, and the following problems are faced:
1. the traditional horizontal directional drilling machine adopts a top drive type power head, the length of each drill rod is 3 meters generally, due to the wide ship body of a sunken ship, drilling holes need to be drilled at the bottom of the ship in a penetrating mode, the existing clamp type power head adopts a top drive mode to drive the drill rods, and therefore screwing and unscrewing work, lubricating grease coating work at the connecting thread positions of the drill rods and work of replacing new drill rods need to be frequently carried out in the drilling process. Due to the limitation of the operation space and the silt on the operation water surface, the work of smearing lubricating grease is difficult to smoothly carry out and even the silt is mixed, so that the screwing-in or the subsequent unscrewing is difficult, a new drill rod cannot be replaced, and the like;
2. in order to ensure that a drill rod of a drilling machine penetrates through the bottom of a sunken ship to complete guiding and drilling according to design requirements, a remote control guiding device needs to be installed on a drill bit, because underwater and underground signal interference is high, a ship body can also interfere with a wireless signal, in order to ensure guiding precision, the guiding device needs to adopt a wired mode, real-time data of a guiding probe on the drill bit is instantly transmitted to a control console to be controlled, the guiding device is connected with a control console operating on water through a control cable, the control cable needs to be arranged inside the drill rod, therefore, the control cable needs to be disconnected and reconnected when a new drill rod is disconnected and connected every time, and the underwater reconnection of the cable cannot ensure the water resistance and sealing of the cable.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a continuous beam drilling formula level directional drilling and operation method adopts the rig advancing mechanism of a novel structure to the mode that the embrace pressed from both sides impels the drilling rod to advance, realizes in advance to connect the installation with required drilling rod once only, need not to carry out the secondary under water and connects, has solved the problem that prior art exists.
The utility model discloses a following technical scheme realizes:
a continuous rod drilling type horizontal directional drill comprises an underwater drilling mechanism, an overwater power station and an overwater operating platform.
The underwater drilling mechanism is composed of a base, a drill crossbeam and a clamping type power head, wherein the drill crossbeam is arranged on the base, and the clamping type power head is arranged on the drill crossbeam.
The clamping type power head is provided with a wedge-shaped clamping mechanism, and the wedge-shaped clamping mechanism is composed of a drill rod shaft sleeve, a first wedge-shaped clamping sleeve and a second wedge-shaped clamping sleeve.
The drill rod shaft sleeve is characterized in that a plurality of wedge-shaped holes distributed along the circumference are respectively formed in the front end and the rear end of the drill rod shaft sleeve, wedge-shaped clamping blocks are arranged in the wedge-shaped holes, the back sides of the wedge-shaped clamping blocks are provided with outer conical surfaces, and the inclination directions of the wedge-shaped clamping blocks at the front end of the drill rod shaft sleeve and the outer conical surfaces of the wedge-shaped clamping blocks at the rear end of the drill rod shaft.
The first wedge type clamping sleeve and the second wedge type clamping sleeve are respectively arranged at the front end and the rear end of the drill rod shaft sleeve, wedge-shaped grooves matched with the wedge-shaped clamping blocks are formed in the first wedge type clamping sleeve and the second wedge type clamping sleeve, and inner conical surfaces matched with the outer conical surfaces of the wedge-shaped clamping blocks are arranged in the wedge-shaped grooves.
The first wedge type jacket and the second wedge type jacket are connected through a clamping oil cylinder, a cylinder body of the clamping oil cylinder is connected with the first wedge type jacket, and a piston rod of the clamping oil cylinder is connected with the second wedge type jacket.
The principle of the wedge-shaped clamping mechanism is as follows:
the clamping oil cylinder is controlled to drive the first wedge type jacket and the second wedge type jacket to move in the opposite direction or in the opposite direction, the wedge type clamping block is extruded or released through the interaction of the inner conical surfaces of the wedge grooves of the first wedge type jacket and the second wedge type jacket and the outer conical surfaces of the wedge type clamping block, and therefore the drill rod in the drill rod shaft sleeve is clamped or released.
Preferably, a girder swing angle device is arranged on the base and consists of a swing angle base and a swing angle oil cylinder, and the front end of the swing angle base is fixed on a rotating shaft at the front end of the base; the swing angle oil cylinder is horizontally arranged on the base, and the top end of a piston rod of the swing angle oil cylinder is connected with the rear end of the swing angle base; the front part of the swing angle base is provided with a girder support, the rear part of the swing angle base is provided with a supporting oil cylinder, the girder support is connected with the front part of the girder of the drilling machine, the bottom of a cylinder body of the supporting oil cylinder is arranged on the swing angle base, and a piston rod of the supporting oil cylinder is connected with the rear part of the girder of the drilling machine.
Preferably, the four corners of the base are respectively provided with an anchoring device driven by a hydraulic motor.
Preferably, the clamping type power head is provided with a hydraulic rotary motor for driving the drill rod shaft sleeve to rotate.
An underwater unmanned cable penetrating operation method comprises the following steps:
(1) placing the underwater drilling mechanism at an underwater preset position, fixing by using an anchoring device, and controlling a girder swinging angle device to adjust the direction and the angle of the girder according to preset requirements;
(2) connecting continuous drill rods with required lengths according to operation requirements, and arranging a guide device control cable;
(3) arranging the connected continuous drill rod on an underwater drilling mechanism, and arranging a drill bit and a guiding device;
(4) clamping a continuous drill rod by a clamping type power head of the underwater drilling system to drill a through cable at a preset angle, and monitoring and correcting the drilling direction of a drill bit by an above-water operation platform;
(5) and when the clamp type power head is pushed to the tail end of the stroke, the continuous drill rod is loosened and retreated to the original position, and then the continuous drill rod is clamped continuously to drill.
(6) And the drill rod passes through the bottom of the sunken ship to complete the guiding and drilling work according to the design requirements under the support of the guiding system and the monitoring system, a steel cable is hung at the drill bit, and the clamp type power head of the underwater drilling mechanism clamps the drill rod to complete the back-dragging work, so that the cable penetrating operation is completed.
The utility model has the beneficial technical effects that:
the utility model provides a continuous rod drilling type horizontal directional drilling and underwater unmanned cable-penetrating operation method, which realizes the continuous rod drilling construction process through a special hydraulic loading wedge-shaped clamping mechanism, the hydraulic loading wedge-shaped clamping mechanism moves towards opposite directions simultaneously under the condition of receiving the loading acting force of a hydraulic cylinder, and respectively extrudes respective corresponding wedge-shaped clamping blocks, the wedge-shaped clamping blocks receive the radial component force of the clamping sleeves and automatically clamp a continuous drill rod and keep the position relatively fixed, and under the propulsion of an embrace clamp type power head, the whole wedge-shaped clamping mechanism and the continuous drill rod are jointly rotationally propelled towards the preset direction; because the utility model discloses a, the continuous rod is bored, and the drilling rod is once only connected, need not to meet the drilling rod midway, has solved the difficult problem that horizontal drilling rig creeps into under water, realizes unmanned cable operation under water, realizes the quick threading work to sunken ship salvage in-process steel cable, solves in the original work degree of dependence to personnel high, and operating strength is big, and operating time is long, and the operating efficiency is low, influences the problem that sunken ship salvage engineering became defeated even.
Drawings
FIG. 1 is a schematic structural view of a continuous rod drilling type horizontal directional drill according to the present invention;
FIG. 2 is a perspective view of the clip-type power head;
FIG. 3 is a cross-sectional view of the clip-on power head;
FIG. 4 is a B-B cross-sectional view of the clip-on power head.
In the figure: 1. the underwater drilling mechanism comprises an underwater drilling mechanism, 2, an overwater power station, 3, an overwater operating platform, 4, a hydraulic pipeline, 5, a base, 5.1, a girder swing angle device, 5.2, a swing angle base, 5.3, a swing angle oil cylinder, 5.4, a rotating shaft, 5.5, a girder support, 5.6, a supporting oil cylinder, 6, a drilling machine girder, 7, a clamping type power head, 8, a wedge-shaped clamping mechanism, 8.1, a drill rod shaft sleeve, 8.2, a first wedge-shaped clamping sleeve, 8.3, a second wedge-shaped clamping sleeve, 8.4, a wedge-shaped hole, 8.5, a wedge-shaped clamping block, 8.6, an outer conical surface, 8.7, a wedge-shaped groove, 8.8, an inner conical surface, 8.9, a clamping oil cylinder, 9, a guide device control cable, 10, an anchoring device, 11 and a hydraulic rotary motor.
Detailed Description
The following description of the embodiments will help the public to understand the present invention, but the specific embodiments given by the applicant should not be considered as limiting the technical solution of the present invention, and any changes in the definition of the components or technical features and/or in the form of the overall structure rather than substantial changes should be considered as the protection scope defined by the technical solution of the present invention.
The embodiment provides a continuous rod drilling type horizontal directional drill, which is structurally shown in figures 1-4 and comprises an underwater drilling mechanism 1, an overwater power station 2 and an overwater operating platform 3.
The overwater power station 2 is connected with an oil cylinder device of the underwater drilling mechanism 1 through a hydraulic pipeline 4.
The underwater drilling mechanism 1 consists of a base 5, a drill crossbeam 6 and a clamp type power head 7; the drilling machine girder 6 is arranged on the base 5, and the clamp type power head 7 is arranged on the drilling machine girder.
A girder swing angle device 5.1 is arranged on the base 5, the girder swing angle device 5.1 is composed of a swing angle base 5.2 and a swing angle oil cylinder 5.3, and the front end of the swing angle base 5.2 is fixed on a rotating shaft 5.4 at the front end of the base 5; the swing angle oil cylinder 5.3 is horizontally arranged on the base 5, and the top end of a piston rod of the swing angle oil cylinder 5.3 is connected with the rear end of 5.2 of the swing angle base; the front part of the swing angle base 5.2 is provided with a girder support 5.5, the rear part is provided with a support oil cylinder 5.6, the girder support 5.5 is connected with the front part of the girder 6 of the drilling machine, the bottom of the cylinder body of the support oil cylinder 5.6 is arranged on the swing angle base 5.2, and the piston rod of the support oil cylinder 5.6 is connected with the rear part of the girder 6 of the drilling machine.
The clamping type power head 7 is provided with a wedge-shaped clamping mechanism 8, and the wedge-shaped clamping mechanism 8 is composed of a drill rod shaft sleeve 8.1, a first wedge-shaped clamping sleeve 8.2 and a second wedge-shaped clamping sleeve 8.3.
Both ends respectively are equipped with a plurality of wedge holes 8.4 that distribute along the circumference around the drill pipe axle sleeve 8.1, be equipped with wedge clamp 8.5 in the wedge hole 8.4, the dorsal part of wedge clamp 8.5 is equipped with outer conical surface 8.6, the outer conical surface 8.6 of the wedge clamp 8.5 of drill pipe axle sleeve 8.1 front end inclines backward, the outer conical surface 8.6 of the wedge clamp 8.5 of drill pipe axle sleeve 8.1 rear end inclines forward.
The first wedge type jacket 8.2 and the second wedge type jacket 8.3 are respectively arranged at the front end and the rear end of the drill rod shaft sleeve 8.1, wedge-shaped grooves 8.7 matched with the wedge-shaped clamping blocks 8.5 are formed in the first wedge type jacket 8.2 and the second wedge type jacket 8.3, and inner conical surfaces 8.8 matched with the outer conical surfaces 8.6 of the wedge-shaped clamping blocks 8.5 are arranged in the wedge-shaped grooves.
The first wedge type jacket 8.2 and the second wedge type jacket 8.3 are connected through a clamping oil cylinder 8.9, a cylinder body of the clamping oil cylinder 8.9 is connected with the first wedge type jacket 8.2, and a piston rod of the clamping oil cylinder 8.9 is connected with the second wedge type jacket 8.3.
The principle of the wedge-shaped clamping mechanism is as follows:
the expansion of a piston rod of a clamping oil cylinder 8.9 is controlled to drive a first wedge type jacket 8.2 to move forwards and a second wedge type jacket 8.3 to move backwards, and radial pressure is formed on a wedge type clamping block 8.5 through the interaction of an inner conical surface 8.8 of a wedge groove 8.7 of the first wedge type jacket 8.2 and the second wedge type jacket 8.3 and an outer conical surface 8.6 of the wedge type clamping block 8.5, so that a drill rod 12 in a drill rod shaft sleeve 8.1 is clamped tightly; by controlling the contraction of the piston rod of the clamping cylinder 8.9, the first wedge type jacket 8.2 is driven to move backwards and the second wedge type jacket 8.3 moves forwards, so that the pressure of the first wedge type jacket 8.2 and the second wedge type jacket 8.3 on the wedge type clamping block 8.5 is released, and the wedge type clamping block 8.5 is promoted to release the drill rod 12.
The four corners of the base 1 are respectively provided with an anchoring device 10 driven by a hydraulic motor.
And the clamping type power head 7 is provided with a hydraulic rotary motor 11 for driving the drill rod shaft sleeve 8.1 to rotate.
The embodiment also provides an underwater unmanned cable penetrating operation method:
(1) placing the underwater drilling mechanism at an underwater preset position, fixing by using an anchoring device, and controlling a girder swinging angle device to adjust the direction and the angle of the girder according to preset requirements;
(2) connecting continuous drill rods with required lengths according to operation requirements, and arranging a guide device control cable;
(3) arranging the connected continuous drill rod on an underwater drilling mechanism, and arranging a drill bit and a guiding device;
(4) clamping a continuous drill rod by a clamping type power head of the underwater drilling system to drill a through cable at a preset angle, and monitoring and correcting the drilling direction of a drill bit by an above-water operation platform;
(5) and when the clamp type power head is pushed to the tail end of the stroke, the continuous drill rod is loosened and retreated to the original position, and then the continuous drill rod is clamped continuously to drill.
(6) And the drill rod passes through the bottom of the sunken ship to complete the guiding and drilling work according to the design requirements under the support of the guiding system and the monitoring system, a steel cable is hung at the drill bit, and the clamp type power head of the underwater drilling mechanism clamps the drill rod to complete the back-dragging work, so that the cable penetrating operation is completed.
The utility model has the beneficial technical effects that:
the utility model provides a continuous rod drilling type horizontal directional drilling and underwater unmanned cable-penetrating operation method, which realizes the continuous rod drilling construction process through a special hydraulic loading wedge-shaped clamping mechanism, the hydraulic loading wedge-shaped clamping mechanism moves towards opposite directions simultaneously under the condition of receiving the loading acting force of a hydraulic cylinder, and respectively extrudes respective corresponding wedge-shaped clamping blocks, the wedge-shaped clamping blocks receive the radial component force of the clamping sleeves and automatically clamp a continuous drill rod and keep the position relatively fixed, and under the propulsion of an embrace clamp type power head, the whole wedge-shaped clamping mechanism and the continuous drill rod are jointly rotationally propelled towards the preset direction; because the utility model discloses a, the continuous rod is bored, and the drilling rod is once only connected, need not to meet the drilling rod midway, has solved the difficult problem that horizontal drilling rig creeps into under water, realizes unmanned cable operation under water, realizes the quick threading work to sunken ship salvage in-process steel cable, solves in the original work degree of dependence to personnel high, and operating strength is big, and operating time is long, and the operating efficiency is low, influences the problem that sunken ship salvage engineering became defeated even.
It should be noted that, in the attached drawing 1 provided by the present invention, the continuous drill rod is longer, and the rear end can be bent downward due to the gravity action, because the attached drawing has a limited space, the bending radian of the drill rod in the drawing is larger than the actual bending radian, and in practice, the drill rod is longer than that in the attached drawing, and the bending radian is also gentler.
Of course, the present invention can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications should fall within the protection scope of the appended claims.
Claims (5)
1. A continuous rod drilling type horizontal directional drill is characterized by comprising an underwater drilling mechanism, an overwater power station and an overwater operating platform, wherein the underwater drilling mechanism is composed of a base, a drill crossbeam and a clamp type power head, the drill crossbeam is arranged on the base, and the clamp type power head is arranged on the drill crossbeam;
the clamping type power head is provided with a wedge-shaped clamping mechanism, and the wedge-shaped clamping mechanism consists of a drill rod shaft sleeve, a first wedge-shaped clamping sleeve and a second wedge-shaped clamping sleeve;
the front end and the rear end of the drill rod shaft sleeve are respectively provided with a plurality of wedge-shaped holes distributed along the circumference, wedge-shaped clamping blocks are arranged in the wedge-shaped holes, the back sides of the wedge-shaped clamping blocks are provided with outer conical surfaces, and the inclination directions of the wedge-shaped clamping blocks at the front end of the drill rod shaft sleeve and the outer conical surfaces of the wedge-shaped clamping blocks at the rear end of the drill rod shaft sleeve are opposite;
the first wedge type jacket and the second wedge type jacket are respectively arranged at the front end and the rear end of the drill rod shaft sleeve, wedge-shaped grooves matched with the wedge-shaped clamping blocks are respectively arranged on the first wedge type jacket and the second wedge type jacket, and inner conical surfaces matched with the outer conical surfaces of the wedge-shaped clamping blocks are arranged in the wedge-shaped grooves;
the first wedge type jacket and the second wedge type jacket are connected through a clamping oil cylinder, a cylinder body of the clamping oil cylinder is connected with the first wedge type jacket, and a piston rod of the clamping oil cylinder is connected with the second wedge type jacket.
2. The continuous beam drilling type horizontal directional drill according to claim 1, wherein the base is provided with a girder swing angle device, the girder swing angle device is composed of a swing angle base and a swing angle oil cylinder, and the front end of the swing angle base is fixed on a rotating shaft at the front end of the base.
3. The continuous rod drilling type horizontal directional drill according to claim 2, wherein the swing angle oil cylinder is horizontally arranged on the base, and the top end of a piston rod of the swing angle oil cylinder is connected with the rear end of the swing angle base; the front part of the swing angle base is provided with a girder support, the rear part of the swing angle base is provided with a supporting oil cylinder, the girder support is connected with the front part of the girder of the drilling machine, the bottom of a cylinder body of the supporting oil cylinder is arranged on the swing angle base, and a piston rod of the supporting oil cylinder is connected with the rear part of the girder of the drilling machine.
4. The continuous beam drilling horizontal directional drill of claim 1, wherein one hydraulic motor driven anchor is provided at each of the four corners of the base.
5. The continuous beam drilling type horizontal directional drill according to claim 1, wherein the clamp type power head is provided with a hydraulic rotary motor for driving the drill stem shaft sleeve to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021058687.1U CN212738466U (en) | 2020-06-10 | 2020-06-10 | Continuous rod drilling type horizontal directional drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021058687.1U CN212738466U (en) | 2020-06-10 | 2020-06-10 | Continuous rod drilling type horizontal directional drill |
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| Publication Number | Publication Date |
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| CN212738466U true CN212738466U (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021058687.1U Active CN212738466U (en) | 2020-06-10 | 2020-06-10 | Continuous rod drilling type horizontal directional drill |
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| Country | Link |
|---|---|
| CN (1) | CN212738466U (en) |
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2020
- 2020-06-10 CN CN202021058687.1U patent/CN212738466U/en active Active
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