CN216767966U - Rotary drill feeding hydraulic system and rotary drill - Google Patents
Rotary drill feeding hydraulic system and rotary drill Download PDFInfo
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- CN216767966U CN216767966U CN202220177506.XU CN202220177506U CN216767966U CN 216767966 U CN216767966 U CN 216767966U CN 202220177506 U CN202220177506 U CN 202220177506U CN 216767966 U CN216767966 U CN 216767966U
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Abstract
The utility model discloses a rotary drill feeding hydraulic system and a rotary drill, and belongs to the technical field of engineering machinery. The hydraulic system comprises a hydraulic oil tank, a feeding hydraulic cylinder, a main hydraulic pump, a pilot overflow valve, a proportional overflow valve and an electromagnetic switch valve; the main hydraulic pump is a closed hydraulic pump, a first oil port of the main hydraulic pump is connected with a rodless cavity of the feeding hydraulic cylinder through a first oil path, and a second oil port of the main hydraulic pump is connected with a rod cavity of the feeding hydraulic cylinder through a second oil path; the pilot overflow valve is connected to a second oil path, an oil inlet and an oil outlet of the pilot overflow valve are both connected to the second oil path, and a first one-way valve is arranged on the oil path between the oil inlet and the oil outlet; the proportional overflow valve is connected with a control oil port of the pilot overflow valve; the electromagnetic switch valve is respectively connected with the proportional overflow valve and the pilot overflow valve and is configured to control the proportional overflow valve and the pilot overflow valve to open and close so as to execute a first locking function. The utility model can realize the purpose of drilling by using the roller bit and the down-the-hole hammer on the roller drill.
Description
Technical Field
The utility model belongs to the technical field of engineering machinery, and particularly relates to a rotary drill feeding hydraulic system and a rotary drill.
Background
Currently, two types of drilling machines are commonly used for drilling during the mining of surface mines. One is the percussion drill, which is commonly used for small bore operations; the other is a rotary drill, which is commonly used for large bore operations.
Impact drills can be classified into top hammer type and down-the-hole type according to different impact modes. The top hammer type drilling machine adopts a rock drill to output impact force at the top of a drill rod to drill. The down-the-hole drill adopts a down-the-hole hammer to output impact force at the bottom of a drill rod to drill. Rotary drilling machines also are known as roller cone drilling machines, because they use roller cone bits to deliver torque and downward pressure at the bottom of the drill pipe to drill a hole.
The roller cone drilling machine needs a feeding system to provide great downward pressure for a roller cone drill bit so as to generate enough torque for rock breaking and drilling. Most of the current feeding systems adopt hydraulic drive to provide enough downward pressure for the roller bit. However, in mine drilling operations, it is desirable for the mining personnel to be able to use a down-the-hole hammer with a roller cone drill to cope with different geological conditions. However, when the down-the-hole hammer is used for drilling, the impact force is relied on, and a large downward pressure is not needed, but the output force of a hydraulic feeding system of the roller bit drill is large, even the weight of a drill rod of the roller bit drill exceeds the downward pressure needed by the down-the-hole hammer during working, so that if the roller bit is directly replaced by the down-the-hole hammer, the drilling of the down-the-hole hammer is difficult to realize. If a down-the-hole hammer is used to drill a hole, the down-the-hole hammer must be replaced to complete the drilling, which has a significant impact on both cost and efficiency.
SUMMERY OF THE UTILITY MODEL
The technical problem is as follows: aiming at the problem that the existing roller cone drilling machine is difficult to drill a down-the-hole hammer, the utility model provides a feeding hydraulic system of the roller cone drilling machine and the roller cone drilling machine, which can realize the purpose of drilling by using a roller cone bit and can also drill a hole by using the down-the-hole hammer on the roller cone drilling machine.
The technical scheme is as follows: in a first aspect, the utility model provides a feeding hydraulic system of a roller-bit drill, which comprises a hydraulic oil tank and further comprises:
a feed hydraulic cylinder having a rodless chamber and a rod chamber for driving the down-the-hole hammer or drill bit to move;
the main hydraulic pump is a closed hydraulic pump and is provided with a first oil port and a second oil port, the first oil port is connected with the rodless cavity through a first oil path, and the second oil port is connected with the rod cavity through a second oil path;
the pilot overflow valve is connected to a second oil path, an oil inlet and an oil outlet of the pilot overflow valve are both connected to the second oil path, and a first one-way valve is arranged on the oil path between the oil inlet and the oil outlet;
the proportional overflow valve is connected with a control oil port of the pilot overflow valve;
the electromagnetic switch valve is respectively connected with the proportional overflow valve and the pilot overflow valve and is configured to control the proportional overflow valve and the pilot overflow valve to be opened and closed so as to execute a first locking function.
Further, a locking balance valve is arranged on the second oil path and configured to perform a second locking function, and a control oil port of the locking balance valve is connected to the first oil path.
Furthermore, an oil supplementing check valve is connected to the second oil path, and hydraulic oil with certain pressure passes through the oil supplementing check valve and enters the main hydraulic pump through the second oil port to supplement oil for the main hydraulic pump.
Further, the hydraulic system further comprises an auxiliary hydraulic pump which is configured to output hydraulic oil with certain pressure.
Furthermore, a first overflow valve is arranged on an oil path between the oil supplementing one-way valve and the auxiliary hydraulic pump.
Furthermore, a second overflow valve is arranged on an oil way between the oil supplementing one-way valve and the hydraulic oil tank.
Furthermore, an oil drainage balance valve is connected to the first oil path and used for discharging redundant hydraulic oil in the loop to a hydraulic oil tank.
Further, a back-lift pressure gauge is arranged on the second oil circuit and is configured to monitor the pressure on the second oil circuit in real time.
Further, when the hydraulic system provides hydraulic power for the down-the-hole hammer, the set pressure value of the proportional overflow valve is adjusted to be maximum, the output pressure of the closed hydraulic pump is adjusted to be a first pressure value, the electromagnetic switch valve is opened, and the drill rod is locked;
gradually reducing the set pressure of the proportional overflow valve until the feeding speed and the back-lifting pressure meet the use requirement of the down-the-hole hammer for drilling;
when hydraulic power is provided for the roller bit, the proportional electromagnetic valve is disconnected, the electromagnetic switch valve is opened, and the set pressure of the pilot overflow valve is the lowest value.
In a second aspect, the utility model provides a roller cone drilling machine, which comprises any one of the roller cone drilling machine feeding hydraulic systems provided by the utility model.
Compared with the prior art, the hydraulic feeding system is provided with the pilot overflow valve, the proportional overflow valve and the electromagnetic switch valve, the first one-way valve is arranged between the oil inlet and the oil outlet of the pilot overflow valve, the locking function of the drill rod is realized through the group and the function of the valves, and the whole feeding hydraulic system can provide hydraulic power for the down-the-hole hammer and can also provide hydraulic power for the roller bit by adjusting the on-off and set pressure of the proportional electromagnetic valve, so that the roller bit can be used for drilling holes on the roller drill, the down-the-hole hammer can be used for drilling holes, the applicability of the roller drill is improved, the cost is reduced, and the efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a hydraulic feed system of a roller cone drilling machine according to an embodiment of the utility model
1. A feed hydraulic cylinder; 2. a main hydraulic pump; 3. a first oil port; 4. a second oil port; 5. a first oil passage; 6. a second oil passage; 7. a pilot overflow valve; 8. a proportional relief valve; 9. an electromagnetic on-off valve; 10. a first check valve; 11. a lock-up balancing valve; 12. an oil-supplementing one-way valve; 13. an oil drainage balance valve; 14. reversely lifting the pressure gauge; 15. an auxiliary hydraulic pump; 16. a first overflow valve; 17. a second overflow valve; 18. and a hydraulic oil tank.
Detailed Description
The utility model is further described with reference to the following examples and the accompanying drawings. It is noted that the terms "first", "second", and the like in the embodiments are merely for convenience of description, and are not to be construed as limiting the number and the like.
Generally, a roller cone drill uses a roller cone bit to drill a hole, and when the roller cone bit is used for drilling the hole, a feeding system is required to provide a large downward pressure to the roller cone bit, so that a large enough torque is generated to drill the broken rock. When the down-the-hole hammer is used for drilling, impact force is relied on, large downward pressure is not needed, the output force of a hydraulic feeding system of the original roller bit drill is large, and even the weight of a drill rod of the roller bit drill exceeds the downward pressure needed by the down-the-hole hammer during working, so that if the roller bit is directly replaced by the down-the-hole hammer, the down-the-hole hammer is difficult to drill.
In order to use the down-the-hole hammer on the roller cone drilling machine, the emergency hydraulic system of the roller cone drilling machine is provided, and the emergency hydraulic system can be used for drilling on one system by using the down-the-hole hammer and a roller cone bit.
FIG. 1 shows a schematic diagram of a hydraulic feed system of a roller cone drilling rig in an embodiment of the utility model. As shown in fig. 1, the proposed hydraulic feed system includes a hydraulic oil tank 18, a feed hydraulic cylinder 1, a main hydraulic pump 2, a pilot relief valve 7, a proportional relief valve 8, and an electromagnetic on-off valve 9. The hydraulic oil tank 18 is used for storing hydraulic oil. The feeding hydraulic cylinder 1 can be used for providing power for a drilling component, and when a roller bit is adopted for drilling, a roller bit is installed; when a down-the-hole hammer is used for drilling, the down-the-hole hammer is installed. The drill rod is lifted upwards or drilled downwards through the feeding hydraulic cylinder under the driving of the feeding hydraulic cylinder 1. The feeding hydraulic cylinder is provided with a rodless cavity and a rod cavity, when oil is fed into the rod cavity, the drill rod is lifted, and the drilling component is lifted along with the drill rod; and when oil is fed into the rodless chamber, drilling is performed downwards.
In the embodiment of the present invention, the main hydraulic pump 2 is a closed hydraulic pump, and may be driven by another power source, which is not shown in fig. 1, and specifically may be an engine, etc. The main hydraulic pump 2 may supply the working oil to the entire hydraulic system. The main hydraulic pump 2 is provided with a first oil port 3 and a second oil port 4, the first oil port 3 is connected with the rodless cavity through a first oil path 5, and the second oil port 4 is connected with the rod cavity through a second oil path 6. Therefore, the working oil output from the first oil port 3 of the main hydraulic pump enters a rodless cavity of the feeding hydraulic cylinder 1, and pushes a piston rod to extend out, so that a drill rod is driven to move downwards to drill a hole; at this time, the hydraulic oil in the rod chamber flows back to the main hydraulic pump 2 through the second oil port. When the hydraulic oil is output from the second oil port 4, the hydraulic oil enters the rod cavity of the feeding hydraulic cylinder, the piston rod retracts to lift the drill rod, and at the moment, the hydraulic pressure in the rodless cavity flows back to the main hydraulic pump 2 through the first oil port 3.
The pilot overflow valve 7 is connected to the second oil path 6, wherein an oil inlet and an oil outlet of the pilot overflow valve 7 are both connected to the second oil path 6, and a first check valve 10 is arranged on the oil path between the oil inlet and the oil outlet. The proportional overflow valve 8 is connected with a control oil port of the pilot overflow valve 7; and an electromagnetic switch valve 9, wherein the electromagnetic switch valve 9 is respectively connected with the proportional overflow valve 8 and the pilot overflow valve 7, and is configured to control the proportional overflow valve 8 and the pilot overflow valve 7 to be opened and closed so as to execute a first locking function.
More specifically, with reference to fig. 1, a control oil port of the pilot overflow valve 7 is connected to an oil inlet of the proportional overflow valve 8, and an oil drain port of the pilot overflow valve 7 is connected to an oil inlet of the electromagnetic switch valve 9; an oil outlet of the proportional overflow valve 8 is connected with an oil inlet of the electromagnetic switch valve 9, and an oil outlet of the electromagnetic switch valve 9 is directly connected with a hydraulic oil tank 18. In the embodiment of the present invention, a single lock function, that is, a so-called first lock function, is realized by the combined function of the pilot relief valve 7, the proportional relief valve 8, the first check valve 10, and the electromagnetic opening/closing valve. This locking function prevents damage to the down-the-hole hammer from excessive downforce when drilling with the down-the-hole hammer. The roller bit can be used for drilling in the same hydraulic feeding system, and the down-the-hole hammer can be used for drilling in practice, and the combined function is realized.
The following is a description of how the feed hydraulic system of the present invention can be adapted for use with down-the-hole hammers and roller cone drill bits. When the down-the-hole hammer is used for drilling, it is mentioned in the foregoing that when the down-the-hole hammer is used for drilling, the impact force is relied on, so that a large downward pressure is not needed, the pressure output by the hydraulic system is large, and even the weight of a drill rod of the roller bit drill exceeds the downward pressure required by the down-the-hole hammer during working.
Therefore, when drilling with the down-the-hole hammer, an input electric signal maximizes the set pressure value of the proportional relief valve 8. The output pressure of the main hydraulic pump 2 is adjusted to a certain lower pressure value (namely, a first pressure value), an electric signal is input to open the electromagnetic switch valve 9, and at the moment, the drill rod is locked and does not feed downwards.
During operation, an operator can monitor the reverse lift pressure value while reducing the input electric signal of the proportional relief valve 8. Along with the reduction of the set pressure value of the proportional relief valve 8, the drill rod starts to move downwards until the feeding speed and the reverse lifting pressure meet the use requirements of the down-the-hole hammer for drilling, so that the down-the-hole hammer is prevented from being damaged due to the overlarge downward pressure of the rotary drill.
Specifically, a back-lift pressure gauge 14 may be disposed on the second oil path 6, and configured to monitor the pressure on the second oil path 6 in real time, so that an operator may monitor the data of the back-lift pressure gauge in real time.
When the roller bit is used for drilling, the input electric signal of the proportional overflow valve 8 is cut off, the electromagnetic switch valve 9 is opened, the set pressure of the pilot overflow valve 7 is the lowest value, and the pilot overflow valve 7 is equivalent to a fixed channel which does not play a role in control. At this time, the feed hydraulic system needs to provide a great downward pressure to the roller bit, and the set pressure of the main hydraulic pump 2 can reach a maximum value.
According to the above description, in a feeding hydraulic system, an operator can choose to drill with a down-the-hole hammer or with a roller bit according to field requirements, without different drilling machines. In addition, the provided feeding hydraulic system is a closed hydraulic system, and has better energy saving performance compared with the feeding hydraulic system of the existing roller bit drilling machine. And compared with a hydraulic system adopting a hydraulic motor and a speed reducer to provide downward pressure, the hydraulic tower crane has smaller volume and can be reasonably arranged in a limited tower space.
Further, in the embodiment of the present invention, a lockup balancing valve 11 configured to perform a second lockup function is provided on the second oil passage 6, and a control port of the lockup balancing valve 11 is connected to the first oil passage 5. The locking balance valve 11 is used for adding a locking function, and when drilling is carried out, the drill rod can be reliably locked by matching with the first locking function.
In the embodiment of the present invention, the second oil path 6 is connected to an oil-supplementing check valve 12, and hydraulic oil having a certain pressure passes through the oil-supplementing check valve 12 and enters the main hydraulic pump 2 through the second oil port 4 to supplement oil to the main hydraulic pump 2. Because the main hydraulic pump 2 is a closed hydraulic pump in the embodiment of the present invention, when the piston rod of the feed hydraulic cylinder 1 extends, because the areas of the two working chambers of the feed hydraulic cylinder 1 are not equal, the flow rate of the hydraulic oil output by the rod chamber when the feed hydraulic cylinder 1 extends is smaller than the flow rate output by the closed hydraulic pump, which is less than the flow rate required to be sucked by the low-pressure side (the second oil port at this time) of the closed hydraulic pump. Therefore, additional flow needs to be added to this closed circuit, and the oil replenishment check valve 12 plays this role. When the hydraulic cylinder extends out, the oil-supplementing one-way valve 12 introduces extra oil-supplementing flow from a hydraulic oil tank or an oil return pipeline with certain pressure to be sucked by the closed hydraulic pump.
In addition, in order to provide a certain pressure of hydraulic oil during oil supplement, in the embodiment of the present invention, the feeding hydraulic system further includes an auxiliary hydraulic pump 15, and the auxiliary hydraulic pump 15 can output hydraulic oil with a certain pressure so as to supplement oil to the main hydraulic pump 2 through the oil supplementing check valve 12. In one embodiment of the utility model, the same power source may be used to power both the main hydraulic pump 2 and the auxiliary hydraulic pump.
Further, a first relief valve 16 is provided on an oil path between the oil supply check valve 12 and the auxiliary hydraulic pump 15, and as shown in fig. 1, the first relief valve 16 can ensure that the control oil pressure of the main hydraulic pump is sufficient, and when the set pressure of the first relief valve 16 is exceeded, the hydraulic oil is supplied to the main hydraulic pump 2 through the oil supply check valve 12.
In addition, in the embodiment of the present invention, the second relief valve 17 is provided in the oil passage between the oil replenishment check valve 12 and the hydraulic tank 18, and the oil replenishment pressure can be set by the second relief valve 17 and the excess hydraulic oil is released into the hydraulic tank 18.
Because the areas of the two working cavities of the feeding hydraulic cylinder 1 are unequal, the flow of the hydraulic oil output by the rodless cavity is larger than that of the closed hydraulic pump when the hydraulic cylinder retracts, and exceeds the flow required to be sucked at the low-pressure side of the closed hydraulic pump. It is therefore necessary to bleed excess flow from this closed circuit to the hydraulic tank 18, and this is therefore effected in the embodiment of the utility model by the provision of the spill balance valve 13. When the feeding hydraulic cylinder retracts, the working oil simultaneously flows to the control oil port of the oil drainage balance valve to push the valve core open, and redundant hydraulic oil is discharged.
The oil drainage balance valve 13 is connected to the first oil path 5, specifically, an oil inlet and an oil drainage port of the oil drainage balance valve 13 are both connected to the first oil path 5, an oil outlet of the oil drainage balance valve 13 is directly connected to the hydraulic oil tank 18, and a control oil port of the oil drainage balance valve 13 is connected to the second oil path 6.
The working process is explained again in connection with the most preferred embodiment of the utility model.
When the drilling is stopped, all electric signals are disconnected, the electromagnetic switch valve 9 disconnects the hydraulic oil at the outlet of the proportional overflow valve 8 and the control oil in the spring cavity of the pilot overflow valve from the oil way of the hydraulic oil tank 18, so that the pilot overflow valve 7 cannot be opened, the locking drill rod does not slide down through the first locking function, and the locking balance valve achieves the second locking function.
When the drill rod is pulled upwards, the main hydraulic pump outputs working oil, the working oil enters the rod cavity of the feeding hydraulic cylinder 1 through the first check valve 10 and the locking balance valve 11, the piston rod of the feeding hydraulic cylinder 1 is pushed to retract, the lifting force is output, and the drill rod is pulled out of the blast hole. The hydraulic oil output by the rodless cavity returns to the main hydraulic pump through the first oil path, and the working oil simultaneously flows to the control oil port of the oil drainage balance valve to push the valve core open, so that redundant hydraulic oil is discharged.
When the drill rod is drilled downwards, the main hydraulic pump outputs working oil to directly enter a rodless cavity of the feeding hydraulic cylinder, the feeding hydraulic cylinder extends out, and the downward pressure is output to drive the drill rod to drill. When feeding the pneumatic cylinder and stretching out, the working oil flows to the spring chamber of draining balanced valve simultaneously, ensures that draining balanced valve can not open when normal drilling, otherwise will lead to the overdraft too low, unable drilling.
When the feeding hydraulic cylinder extends out, the working oil flows to the control oil port of the locking balance valve to push the valve core open, so that the hydraulic oil in the rod cavity of the feeding hydraulic cylinder is allowed to flow to the low-pressure side oil port (the second oil port) of the closed hydraulic pump through the locking balance valve and the pilot overflow valve.
Further, in the embodiment of the utility model, a roller cone drilling machine is provided, and the roller cone drilling machine is provided with the roller cone drilling machine feeding hydraulic system provided by the utility model. When the roller bit drilling machine is used for drilling, a down-the-hole hammer or a roller bit can be used for drilling on the same equipment according to requirements, so that the roller bit drilling machine has better applicability, the cost can be reduced, and the efficiency can be improved.
The above examples are only preferred embodiments of the present invention, it should be noted that: it will be apparent to those skilled in the art that various modifications and equivalents can be made without departing from the spirit of the utility model, and it is intended that all such modifications and equivalents fall within the scope of the utility model as defined in the claims.
Claims (10)
1. A rotary drill feeding hydraulic system comprises a hydraulic oil tank (18), and is characterized by further comprising:
a feeding hydraulic cylinder (1) which is provided with a rodless cavity and a rod cavity and is used for driving a down-the-hole hammer or a roller bit to move;
the hydraulic pump comprises a main hydraulic pump (2), a main hydraulic pump and a hydraulic pump control system, wherein the main hydraulic pump is a closed hydraulic pump and is provided with a first oil port (3) and a second oil port (4), the first oil port (3) is connected with a rodless cavity through a first oil way (5), and the second oil port (4) is connected with a rod cavity through a second oil way (6);
the pilot overflow valve (7) is connected to the second oil way (6), an oil inlet and an oil outlet of the pilot overflow valve (7) are both connected to the second oil way (6), and a first check valve (10) is arranged on an oil way between the oil inlet and the oil outlet;
the proportional overflow valve (8), the said proportional overflow valve (8) is connected with control oil port of the leading overflow valve (7);
the electromagnetic switch valve (9), the electromagnetic switch valve (9) is respectively connected with the proportional overflow valve (8) and the pilot overflow valve (7), and the electromagnetic switch valve is configured to control the proportional overflow valve (8) and the pilot overflow valve (7) to open and close so as to execute a first locking function.
2. The rotary drill feeding hydraulic system according to claim 1, characterized in that a locking balance valve (11) is arranged on the second oil path (6) and is configured to perform a second locking function, and a control oil port of the locking balance valve (11) is connected to the first oil path (5).
3. The feeding hydraulic system of the roller-cone drilling machine according to claim 1, characterized in that an oil-supplementing check valve (12) is connected to the second oil path (6), and hydraulic oil with certain pressure passes through the oil-supplementing check valve (12) and enters the main hydraulic pump (2) through the second oil port (4) to supplement oil for the main hydraulic pump.
4. The roller cone drill feed hydraulic system of claim 3, further comprising an auxiliary hydraulic pump (15) configured to output hydraulic oil at a pressure.
5. The rotary drill feeding hydraulic system according to claim 4, characterized in that a first overflow valve (16) is arranged on an oil path between the oil supplementing one-way valve (12) and the auxiliary hydraulic pump (15).
6. The rotary drill feeding hydraulic system according to claim 5, characterized in that a second overflow valve (17) is arranged on an oil path between the oil supplementing one-way valve (12) and the hydraulic oil tank (18).
7. The rotary drill feeding hydraulic system according to claim 1, characterized in that an oil drainage balance valve (13) is connected to the first oil path (5) and used for draining redundant hydraulic oil in a loop to a hydraulic oil tank (18).
8. The rotary drill feeding hydraulic system according to any one of claims 1-7, characterized in that the second oil circuit (6) is provided with a back-lift pressure gauge (14) configured to monitor the pressure on the second oil circuit (6) in real time.
9. The rotary drill feeding hydraulic system according to claim 8, wherein when the hydraulic system provides hydraulic power for the down-the-hole hammer, the set pressure value of the proportional overflow valve is adjusted to the maximum, the output pressure of the closed hydraulic pump is adjusted to the first pressure value, the electromagnetic switch valve is opened, and the drill rod is locked;
gradually reducing the set pressure of the proportional overflow valve until the feeding speed and the back-lifting pressure meet the use requirement of the down-the-hole hammer for drilling;
when hydraulic power is provided for the roller bit, the proportional electromagnetic valve is disconnected, the electromagnetic switch valve is opened, and the set pressure of the pilot overflow valve is the lowest value.
10. A roller cone drill comprising a roller cone drill feed hydraulic system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220177506.XU CN216767966U (en) | 2022-01-21 | 2022-01-21 | Rotary drill feeding hydraulic system and rotary drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220177506.XU CN216767966U (en) | 2022-01-21 | 2022-01-21 | Rotary drill feeding hydraulic system and rotary drill |
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| Publication Number | Publication Date |
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| CN216767966U true CN216767966U (en) | 2022-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220177506.XU Active CN216767966U (en) | 2022-01-21 | 2022-01-21 | Rotary drill feeding hydraulic system and rotary drill |
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| Country | Link |
|---|---|
| CN (1) | CN216767966U (en) |
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- 2022-01-21 CN CN202220177506.XU patent/CN216767966U/en active Active
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