CN221096517U - Vertical shaft hob and vertical shaft drilling machine - Google Patents
Vertical shaft hob and vertical shaft drilling machine Download PDFInfo
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- CN221096517U CN221096517U CN202322716520.XU CN202322716520U CN221096517U CN 221096517 U CN221096517 U CN 221096517U CN 202322716520 U CN202322716520 U CN 202322716520U CN 221096517 U CN221096517 U CN 221096517U
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- 238000005553 drilling Methods 0.000 title abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 77
- 125000006850 spacer group Chemical group 0.000 claims description 13
- 230000007704 transition Effects 0.000 claims description 8
- 230000005641 tunneling Effects 0.000 abstract description 3
- 230000006835 compression Effects 0.000 description 25
- 238000007906 compression Methods 0.000 description 25
- 230000009286 beneficial effect Effects 0.000 description 18
- 230000006872 improvement Effects 0.000 description 17
- 230000000694 effects Effects 0.000 description 5
- 230000000670 limiting effect Effects 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The utility model belongs to the technical field of tunneling cutters, and particularly provides a vertical shaft hob and a vertical shaft drilling machine. This shaft hobbing cutter has the cutter body of mounting hole, install the bearing in the mounting hole, the cutter body includes path end and major diameter end, path end one side is provided with the mounting hole intercommunication and the diameter is not less than the dismouting hole that is close to the bearing of path end one side, the dismouting hole disposes little end cover, be equipped with sealed clamping ring between the bearing of little end cover and one side that is close to it, sealed clamping ring's outer anchor ring and mounting hole sealing fit, sealed clamping ring's inner ring face is equipped with sealed cooperation portion, little end cover passes through floating seal structure and sealing cooperation portion sealing fit, floating seal structure's external diameter is not greater than the outer lane diameter that is close to the bearing of path end one side. The vertical shaft drilling machine comprises the vertical shaft hob. The utility model realizes the sealing of the end cover and the cutter body on the premise of configuring the floating seal with smaller size, does not need to be provided with larger dismounting holes, and solves the problems in the prior art.
Description
Technical Field
The utility model belongs to the technical field of tunneling cutters, and particularly relates to a vertical shaft hob and a vertical shaft drilling machine.
Background
The shaft engineering is widely applied to the development fields of underground spaces such as pumped storage, underground transportation roadways, tunnel ventilation shafts and the like. The shaft drilling machine is used as important construction equipment for mechanical drilling, has the advantages of high speed, good safety and the like, gradually replaces the traditional drilling and blasting construction method, and starts to be popularized and used in shaft engineering.
The vertical shaft drilling machine comprises a main machine, wherein the front end of the main machine is in transmission connection with a cutter head or a drill bit, a hob is arranged on the cutter head or the drill bit, and the hob impacts, extrudes and shears to break rock under the action of the main machine. The hob for the traditional vertical shaft drilling machine generally comprises a hob shaft, a hob body, an end cover, a bearing and other structures, wherein the hob body comprises a large-diameter end and a small-diameter end, and is arranged on the hob shaft through the bearing. For hard rock stratum, the hob is worn fast, and the disassembly, assembly and maintenance efficiency of the hob is related to the drilling efficiency of the vertical shaft drilling machine.
Patent publication number CN217950359U (publication date: 2022.12.02) discloses a gear-inserted hob of a well-reversing drill, which comprises a hob body (outer hob shell), a hob shaft, a large end cover, a small end cover, a bearing and the like, wherein the hob shaft is provided with a stop convex ring, the large end cover is provided with a step hole matched with the stop convex ring, and the small end cover is provided with a threaded hole and is in threaded fit with the hob shaft. When the cutter shaft is detached, the small end cover can be detached first, and then the cutter shaft is detached.
However, the diameter of the small diameter end of the cutter body of the gear cutting hob of the anti-well drilling machine is larger than the outer ring of the bearing at the side close to the small diameter end, so that when the bearing at the small diameter end is disassembled, the bearing at the side close to the large diameter end and the bearing retainer ring still need to be disassembled, the bearing at the side of the small diameter end is pressed out from the large diameter end, and the efficiency of independently replacing the bearing at the side of the small diameter end is still not high.
In order to meet the requirement of independent disassembly of the bearing at one side of the small diameter end, the patent with the authority of the applicant, publication number CN213205679U, provides a hob which can be used for shaft tunneling, the diameter of one side of the small diameter end of the hob body of the hob is larger than that of the outer ring of the bearing at one side of the small diameter end, and the bearings at two sides can be independently disassembled, so that the hob has higher efficiency.
However, in order to configure the floating seal, a further reaming of the cutter body is required to install the small end cap, which may result in a smaller wall thickness of the cutter body and weakening of the cutter body.
Disclosure of utility model
The utility model aims to provide a vertical shaft hob, which aims to solve the technical problem that the vertical shaft hob in the prior art is easy to cause thinner wall thickness of a hob body when a small-diameter end is independently disassembled and floating seal is configured. The present utility model also aims to provide a solution to the same technical problems as described above.
In order to achieve the above purpose, the technical scheme of the vertical shaft hob provided by the utility model is as follows:
The utility model provides a shaft hobbing cutter, including the cutter body that has the mounting hole, install the bearing in the mounting hole, the cutter body includes path end and major diameter end, path end one side is provided with the mounting hole intercommunication and the diameter is not less than the dismouting hole that is close to the bearing on path end one side, the dismouting hole disposes little end cover, be equipped with sealed clamping ring between the bearing on little end cover and near its one side, sealed clamping ring's outer anchor ring and mounting hole sealing fit, sealed clamping ring's inner ring face is equipped with sealed cooperation portion, little end cover passes through floating seal structure and sealing cooperation portion sealing fit, floating seal structure's external diameter is not greater than the outer lane diameter that is close to the bearing on path end one side.
The beneficial effects are that: the utility model provides an improved vertical shaft hob. The diameter of the dismounting hole at one side of the small-diameter end is not smaller than the diameter of the bearing outer ring close to the small-diameter end, so that the bearing at the side is dismounted or mounted independently from the dismounting hole, and the dismounting efficiency is improved. In addition, the utility model is provided with the floating seal with smaller size, does not need to be provided with an oversized dismounting hole, can not cause excessive thinning of the cutter body, and realizes the sealing between the end cover and the cutter body through the arrangement of the sealing compression ring, namely, the utility model meets the requirements of realizing the sealing between the end cover and the cutter body on the premise of being provided with the floating seal with smaller size, does not need to be provided with a larger dismounting hole, and solves the problems in the prior art.
As a further improvement, the cross section of the sealing compression ring is L-shaped with a right angle transition structure, which forms the sealing mating part.
The beneficial effects are that: on the one hand, the processing is convenient, and the cost is low. In addition, the right-angle transition structure can also play a role in better limiting floating seal, so that the seal is more reliable.
As a further improvement, an end of the seal pressure ring, which is far away from the floating seal structure, abuts against an end of the bearing outer ring.
The beneficial effects are that: at the moment, the contact area between the sealing compression ring and the rotating piece (the cutter body and the bearing inner ring) is increased, so that the rotation is more reliable. In addition, the sealing can also play a certain role in limiting the bearing, so that the reliability is further improved.
As a further improvement, the bearings in the mounting holes include two sets, wherein the size of the bearings near the large diameter end side is larger than the size of the bearings near the small diameter end side.
The beneficial effects are that: during actual cutting, the large-diameter end is firstly contacted with the face, so that the large-diameter end is provided with a large bearing, the stress of the large-diameter end can be improved, and the service life of the bearing is prolonged.
As a further improvement, the inner ring of the bearing is provided with a cutter shaft, the cutter shaft comprises a large-diameter section and a small-diameter section, and a guide surface is arranged between the large-diameter section and the small-diameter section.
The beneficial effects are that: the guiding surface is convenient for the cutter shaft to pass through the inner ring of the large bearing, so that the installation and disassembly efficiency is improved.
As a further improvement, the guiding surface is a guiding cone.
The beneficial effects are that: the conical guide structure has a good guide effect and is convenient to process.
As a further improvement, a bearing spacer is arranged between the two groups of bearings, and the inner annular surface of the bearing spacer is matched with the guide surface.
The beneficial effects are that: the bearing spacer can be adjusted at this time to adjust the bearing play, and the axial length of the hob can be controlled to a small range by the axial position of the guide surface.
As a further improvement, at least two sealing rings are arranged between the outer ring surface of the sealing compression ring and the cutter body.
The beneficial effects are that: the sealing effect of the sealing compression ring and the cutter body is guaranteed by more than two sealing rings.
As a further improvement, the inner ring of the bearing is provided with a cutter shaft, and the small end cover is arranged on the cutter shaft through screws.
The beneficial effects are that: at the moment, the screw of the end cover is detached, so that a channel for detaching the bearing close to one side of the small-diameter end can be opened, and the detaching efficiency is further improved.
In order to achieve the above purpose, the technical scheme of the vertical shaft drilling machine provided by the utility model is as follows:
The utility model provides a shaft drilling machine, including the host computer, the host computer front side is provided with blade disc or drill bit, blade disc or drill bit disposes the shaft hobbing cutter, the shaft hobbing cutter is including the cutter body that has the mounting hole, install the bearing in the mounting hole, the cutter body includes path end and major diameter end, path end one side is provided with and is not less than the dismouting hole that is close to the bearing of path end one side with the mounting hole intercommunication and diameter, the dismouting hole disposes little end cover, be equipped with the seal clamping ring between the bearing of little end cover and being close to its one side, the outer anchor ring and the mounting hole sealing fit of seal clamping ring, the inner ring face of seal clamping ring is equipped with sealing fit portion, little end cover passes through floating seal structure and sealing fit portion sealing fit, floating seal structure's external diameter is not greater than the outer lane diameter that is close to the bearing of path end one side.
The beneficial effects are that: the utility model provides an improved vertical shaft drilling machine. The diameter of the dismounting hole at one side of the small-diameter end is not smaller than the diameter of the bearing outer ring close to the small-diameter end, so that the bearing at the side is dismounted or mounted independently from the dismounting hole, and the dismounting efficiency is improved. In addition, the utility model is provided with the floating seal with smaller size, does not need to be provided with an oversized dismounting hole, can not cause excessive thinning of the cutter body, and realizes the sealing between the end cover and the cutter body through the arrangement of the sealing compression ring, namely, the utility model meets the requirements of realizing the sealing between the end cover and the cutter body on the premise of being provided with the floating seal with smaller size, does not need to be provided with a larger dismounting hole, and solves the problems in the prior art.
As a further improvement, the cross section of the sealing compression ring is L-shaped with a right angle transition structure, which forms the sealing mating part.
The beneficial effects are that: on the one hand, the processing is convenient, and the cost is low. In addition, the right-angle transition structure can also play a role in better limiting floating seal, so that the seal is more reliable.
As a further improvement, an end of the seal pressure ring, which is far away from the floating seal structure, abuts against an end of the bearing outer ring.
The beneficial effects are that: at the moment, the contact area between the sealing compression ring and the rotating piece (the cutter body and the bearing inner ring) is increased, so that the rotation is more reliable. In addition, the sealing can also play a certain role in limiting the bearing, so that the reliability is further improved.
As a further improvement, the bearings in the mounting holes include two sets, wherein the size of the bearings near the large diameter end side is larger than the size of the bearings near the small diameter end side.
The beneficial effects are that: during actual cutting, the large-diameter end is firstly contacted with the face, so that the large-diameter end is provided with a large bearing, the stress of the large-diameter end can be improved, and the service life of the bearing is prolonged.
As a further improvement, the inner ring of the bearing is provided with a cutter shaft, the cutter shaft comprises a large-diameter section and a small-diameter section, and a guide surface is arranged between the large-diameter section and the small-diameter section.
The beneficial effects are that: the guiding surface is convenient for the cutter shaft to pass through the inner ring of the large bearing, so that the installation and disassembly efficiency is improved.
As a further improvement, the guiding surface is a guiding cone.
The beneficial effects are that: the conical guide structure has a good guide effect and is convenient to process.
As a further improvement, a bearing spacer is arranged between the two groups of bearings, and the inner annular surface of the bearing spacer is matched with the guide surface.
The beneficial effects are that: the bearing spacer can be adjusted at this time to adjust the bearing play, and the axial length of the hob can be controlled to a small range by the axial position of the guide surface.
As a further improvement, at least two sealing rings are arranged between the outer ring surface of the sealing compression ring and the cutter body.
The beneficial effects are that: the sealing effect of the sealing compression ring and the cutter body is guaranteed by more than two sealing rings.
As a further improvement, the inner ring of the bearing is provided with a cutter shaft, and the small end cover is arranged on the cutter shaft through screws.
The beneficial effects are that: at the moment, the screw of the end cover is detached, so that a channel for detaching the bearing close to one side of the small-diameter end can be opened, and the detaching efficiency is further improved.
Drawings
FIG. 1 is a schematic view of one embodiment of a shaft hob of the present utility model;
FIG. 2 is a side view of the shaft cutter of FIG. 1;
Reference numerals illustrate:
1. A cutter shaft; 2. a small end cover; 3. a first floating seal; 4. a cutter body; 5. a small bearing; 6. bearing spacer rings; 7. a large bearing; 8. a second floating seal; 9. a large end cover; 10. an end cover sealing ring; 11. sealing compression rings; 12. a floating seal ring; 13. and (5) a screw.
Detailed Description
The present utility model is described in further detail below with reference to examples.
The utility model provides a concrete embodiment 1 of a vertical shaft hob:
The shaft hob provided in this embodiment is shown in fig. 1, and includes a hob body 4, where the whole hob body 4 is in a conical structure and includes a large-diameter end and a small-diameter end, and in fig. 1, one end on the left side is the small-diameter end, and one end on the right side is the large-diameter end. The cutter body 4 is provided with a mounting hole, a bearing and a cutter shaft 1 are mounted in the mounting hole, and a small end cover 2 and a large end cover 9 are respectively arranged at two ends of the cutter body. The bearing comprises two dismounting holes, wherein the diameter of the dismounting holes is not smaller than that of the outer ring of the bearing close to the small diameter end, and the dismounting holes are communicated with the mounting holes so as to meet the requirement that the bearing close to the small diameter end can be dismounted independently. In order to realize sealing, a sealing compression ring 11 is arranged between the small end cover 2 and a bearing close to one side of the small diameter end in the embodiment, the outer annular surface of the sealing compression ring 11 is in sealing fit with the mounting hole, the inner annular surface of the sealing compression ring is provided with a sealing fit part, and a first floating seal 3 is arranged between the small end cover 2 and the sealing fit part of the sealing compression ring 11. The first floating seal 3 is of a structure in the prior art and mainly comprises more than two floating seal rings 12, and is characterized in that the outer diameter of the first floating seal 3 is not larger than the diameter of the outer ring of the bearing close to the small-diameter end. In the embodiment, the first floating seal 3 is matched with the sealing compression ring 11 and the small end cover 2 to realize the sealing of the hob.
Compared with the prior art, the first floating seal with the diameter not larger than that of the outer ring of the bearing close to the small-diameter end is arranged in the embodiment, so that the thickness of the cutter body does not need to be excessively reduced for arranging the floating seal structure, the sealing of the end cover and the cutter body is realized through the special arrangement of the sealing compression ring 11, and the independent disassembly and assembly of the bearing on the small-diameter end side is realized on the premise of arranging the floating seal with smaller size.
The utility model provides a concrete embodiment 2 of a vertical shaft hob:
As shown in fig. 1, the cross section of the sealing compression ring 11 in this embodiment is an L-shaped structure, and includes a right-angle transition portion, which can be regarded as the inner annular surface of the sealing compression ring 11 is a step surface, and the right-angle transition portion forms a sealing engagement portion, and the first floating seal 3 is in sealing engagement. Therefore, the limiting effect of the sealing compression ring 11 on the first floating seal 3 can be enhanced, the stability of the first floating seal 3 is ensured, and meanwhile, the processing is convenient.
Of course, it will be appreciated by those skilled in the art that in some other embodiments the cross-section of the sealing collar 11 may take other forms and that it is not strictly necessary that the sealing engagement must be of a right angle configuration, such as an obtuse angle configuration, and that it is equally capable of sealing engagement with the first floating seal 3.
Specific example 3 of the vertical shaft hob provided by the utility model:
As shown in fig. 1, an end portion of the seal pressing ring 11 distant from the first floating seal 3 in the present embodiment is directly abutted against an outer ring of the bearing on the side close to the small diameter end. On the one hand, the contact area between the sealing compression ring 11 and the rotating body (the bearing outer ring and the cutter body 4) can be increased, the rotation stability of the sealing compression ring 11 is improved, on the other hand, the sealing compression ring 11 can also play a role in supporting a bearing to a certain extent, and the stability of the bearing is improved.
Of course, in other embodiments, as an alternative, the end of the sealing collar 11 remote from the end of the first floating seal 3 may be in contact with only the mounting hole of the cutter body 4, as long as the seal between the sealing collar 11 and the mounting hole is ensured. In this case, the seal ring 11 is not necessarily limited to the L-shaped structure having the right-angle transition portion shown in fig. 1.
Specific example 4 of the vertical shaft hob provided by the utility model:
As shown in fig. 1, the bearings in the present embodiment include two, and the size of the bearing near the large diameter end is larger than that of the bearing near the small diameter end, i.e., the bearing on the left side is the small bearing 5, and the bearing on the right side is the large bearing 7. Considering that the large-diameter end is firstly contacted with the face when cutting and breaking rock, the stress is larger, so that the service life of the bearing at the large-diameter end can be prolonged by making the bearing at the large-diameter end larger.
In addition, the arbor 1 is provided with a guide surface for facilitating the mounting and dismounting of the arbor 1. Specifically, the arbor 1 includes a small-diameter section that mates with the small bearing 5 and a large-diameter section that mates with the large bearing 7, with the guide surface being disposed between the small-diameter section and the large-diameter section. As an alternative, the guiding surface in this embodiment is a guiding conical surface, which has a better guiding effect. However, this does not mean that only a conical surface can be used as the guide surface, but in other embodiments it is equally possible to use, for example, an arcuate surface (both ends of which are tangential to the large-diameter section and the small-diameter section, respectively) as the guide surface.
In order to meet the adjustment of the play of the large bearing and the small bearing, a bearing spacer 6 is arranged between the large bearing 7 and the small bearing 5 in the embodiment. The inner ring surface of the bearing spacer ring 6 is matched with the guide surface, so that the bearing spacer ring is installed at the guide position, the axial size of the hob is effectively controlled, and the stability of the bearing spacer ring 6 can be ensured.
The utility model provides a concrete example 5 of a vertical shaft hob:
In order to improve the tightness of the sealing compression ring 11 and the cutter body mounting hole, two sealing rings are arranged in front of the outer ring surface of the sealing compression ring 11 and the mounting hole in the embodiment. But in other embodiments three or even more sealing rings may be provided, where space permits.
Specific example 6 of the vertical shaft hob provided by the utility model:
The small end cover 2 in the embodiment is screwed on the cutter shaft 1 through the screw 13, as shown in fig. 2, so that the dismounting channel of the small bearing 5 can be opened by dismounting the screw 13, and the dismounting efficiency is higher.
The large end cover 9 is screwed on the cutter shaft 1 through screws, so that both sides can be independently disassembled. Compared with the scheme that the step of the cutter shaft in the prior art is connected with the large end cover in a crimping way and the cutter shaft is locked by the threaded connection of the small end cover, the cutter shaft has obviously higher disassembly and assembly efficiency.
In addition, in order to ensure the sealing of the end cover and the cutter shaft, an end cover sealing ring 10 is arranged between the cutter shaft 1 and the end cover.
The second floating seal 8 provided between the large end cap 9 and the large bearing 7 is consistent with the prior art, which is in consideration of the thicker wall thickness and higher strength of the large diameter end of the cutter body. In fact, however, a further sealing ring may also be provided before the large end cap 9 and the large bearing 7.
Specific embodiments of the shaft boring machine of the present utility model:
The shaft boring machine includes a main machine, a cutter head or a drill bit is provided on a front side of the main machine, and the cutter head or the drill bit is provided with the shaft cutter described in any one of embodiments 1 to 6 of the shaft cutter described above, which will not be described in detail herein.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present utility model, and the present utility model is not limited to the above-mentioned embodiments, but may be modified without inventive effort or equivalent substitution of some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The utility model provides a shaft hobbing cutter, including the cutter body that has the mounting hole, install the bearing in the mounting hole, the cutter body includes path end and major diameter end, path end one side is provided with the mounting hole intercommunication and the diameter is not less than the dismouting hole that is close to the bearing of path end one side, the dismouting hole disposes little end cover, a serial communication port, be equipped with sealed clamping ring between the bearing of little end cover and one side near it, sealed clamping ring's outer ring face and mounting hole sealing fit, sealed clamping ring's inner ring face is equipped with sealed cooperation portion, little end cover passes through floating seal structure and sealing cooperation portion sealing fit, floating seal structure's external diameter is not greater than the outer lane diameter that is close to the bearing of path end one side.
2. The shaft hob according to claim 1, characterized in, that the cross section of the sealing press ring is L-shaped with a right angle transition structure, which forms the sealing engagement.
3. A shaft hob according to claim 1 or 2, characterized in, that the end of the sealing pressure ring remote from the floating seal is in abutment with the end of the bearing outer ring.
4. A shaft hob according to claim 1 or 2, characterized in, that the bearings in the mounting holes comprise two groups, wherein the size of the bearings near the large diameter end is larger than the size of the bearings near the small diameter end.
5. The shaft hob according to claim 4, characterized in that the inner ring of the bearing is provided with a hob shaft, which comprises a large-diameter section and a small-diameter section, between which a guiding surface is arranged.
6. The shaft hob according to claim 5, characterized in, that the guiding surface is a guiding cone.
7. The shaft hob according to claim 5, characterized in, that a bearing spacer is arranged between the two sets of bearings, the inner ring surface of the bearing spacer being adapted to the guide surface.
8. The shaft hob according to claim 1 or 2, characterized in, that at least two sealing rings are arranged between the outer ring surface of the sealing ring and the hob body.
9. The shaft hob according to claim 1 or 2, characterized in, that the inner ring of the bearing is provided with a arbor on which the small end cap is mounted by means of screws.
10. A shaft boring machine comprising a main machine, the front side of which is provided with a cutterhead or a drill bit, characterized in that the cutterhead or the drill bit is provided with a shaft hob according to any one of the claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322716520.XU CN221096517U (en) | 2023-10-10 | 2023-10-10 | Vertical shaft hob and vertical shaft drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322716520.XU CN221096517U (en) | 2023-10-10 | 2023-10-10 | Vertical shaft hob and vertical shaft drilling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221096517U true CN221096517U (en) | 2024-06-07 |
Family
ID=91316296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322716520.XU Active CN221096517U (en) | 2023-10-10 | 2023-10-10 | Vertical shaft hob and vertical shaft drilling machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221096517U (en) |
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2023
- 2023-10-10 CN CN202322716520.XU patent/CN221096517U/en active Active
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