CN214062848U - Multi-magnification-lifting power head device and drilling machine - Google Patents
Multi-magnification-lifting power head device and drilling machine Download PDFInfo
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- CN214062848U CN214062848U CN202022945402.2U CN202022945402U CN214062848U CN 214062848 U CN214062848 U CN 214062848U CN 202022945402 U CN202022945402 U CN 202022945402U CN 214062848 U CN214062848 U CN 214062848U
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Abstract
The embodiment of the utility model provides a multiple-rate-lifting power head device and a drilling machine, wherein the multiple-rate-lifting power head device comprises a sliding frame, a power head box, a bearing seat and a pulley; the power head box is connected with the sliding frame; the bearing seat is connected with the sliding frame, an avoiding structure is formed on the bearing seat, a stopping structure is arranged on a rod body of the power head, the height of the stopping structure is higher than that of the bearing seat, and the horizontal projection of the stopping structure on the bearing seat is distributed on the outer side of the area where the avoiding structure is located; the pulley is rotatably arranged on the bearing seat; the utility model discloses a set up the load seat, can mainly bear the effort that comes from on pulley and the drilling rod by the load seat when the rig promotes, reduced the interaction force between drilling rod and the headstock by a wide margin, formed effectual protection to the headstock, ensured the holistic mechanical strength of unit head device, satisfied the rig and carried out the demand that the multiple times promoted.
Description
Technical Field
The utility model relates to a rig technical field especially relates to a unit head device and rig that multiple times rate promoted.
Background
The long spiral drilling machine is piling equipment for soil layer hole forming operation, and is especially one kind of drilling equipment capable of drilling while lifting and pouring while realizing the construction of long spiral CFA pile and DX extruded pile. The long spiral drilling machine has a fast drilling speed, and needs larger pressurizing force and lifting force because the drilling and the pouring are required to be completed simultaneously in the drilling process.
In order to ensure the pressurizing force and the lifting force during the drilling process, the existing long-spiral drilling machine usually adopts a power head device with two times or four times of lifting. The power head device comprises a sliding frame, a power head box and a pulley, wherein the sliding frame is used for lifting along a mast of the long spiral drilling machine, the sliding frame is connected with the power head box through connecting plates on the left side and the right side, and a drill rod is driven by the power head box to drill.
However, the conventional power head device is not reasonable in design and poor in overall mechanical strength. In the double rate form, the power head device directly mounts a pulley on the sliding frame, resulting in insufficient structural strength of the sliding frame and thus of the entire power head device. In the quadruple rate form, the unit head device is direct with two pulley installations on the yoke plate of left and right both sides, can avoid the direct atress at the sliding frame to a certain extent, but, because the drilling rod is installed on the power head case, by the drive mechanism drive drilling rod rotation of power head incasement, the box of power head case does not possess the mechanical strength of excellence, when the drilling rod is played and is pulled out, have great load because of carrying a large amount of earth on the drilling rod, the pressure that the drilling rod received will direct action on the power head case, easily cause the damage of power head case.
SUMMERY OF THE UTILITY MODEL
The utility model provides a unit head device and rig that multiple times promoted for the box of the slip frame or the unit head device of solving current unit head device is difficult to bear great effort, leads to the unit head device to have the poor problem of whole mechanical strength.
The utility model provides a unit head device that multiple times rate promoted, include: the sliding frame, the power head box, the bearing seat and the pulley; the power head box is connected with the sliding frame; the force bearing seat is connected with the power head box, an avoiding structure is formed on the force bearing seat and is used for a rod body of a power head connected with the power head box to penetrate through, a stopping structure is arranged on the rod body of the power head and is higher than the force bearing seat, and the horizontal projection of the stopping structure on the force bearing seat is distributed on the outer side of an area where the avoiding structure is located; the pulley is rotatably arranged on the bearing seat.
According to the utility model provides a pair of unit head device that multiple multiplying power promoted, the load seat with the headstock is followed the slip direction setting of frame slides, pulley mounting in keep away from on the load seat one side of headstock.
According to the utility model provides a pair of unit head device that multiple times promoted, the frame that slides includes slide and switching frame, the slide with the detachable connection of switching frame, the switching frame respectively with the headstock reaches the detachable connection of load seat.
According to the utility model provides a pair of unit head device that multiple times promoted, the switching frame includes first yoke plate and second yoke plate, first yoke plate form in on the power head case, first yoke plate with the terminal surface of slide is perpendicular, the second yoke plate with the terminal surface of slide is the acute angle, the detachable connection of one end of first yoke plate the slide, the other end of first yoke plate with the one end of second yoke plate is articulated, the detachable connection of the other end of second yoke plate the slide.
According to the utility model provides a pair of unit head device that multiple times promoted, dodge the structure for form in through-hole on the load seat, backstop structure is the flange, the diameter of flange is greater than the diameter of through-hole.
According to the utility model provides a pair of unit head device that multiple multiplying power promoted, the power head case with right the pole and be connected, it is on a parallel with to right the pole the axis setting of unit head, it can follow its endwise slip's adapter to right to be equipped with on the pole, the adapter with the unit head passes through slewing bearing structural connection.
According to the utility model provides a pair of unit head device that multiple multiplying power promoted, the pulley is provided with a plurality ofly, and is a plurality of the rotation axis of pulley distributes in the perpendicular to on the coplanar of the slip direction of sliding frame.
According to the utility model provides a pair of unit head device that multiple multiplying power promoted, each on the load seat the pulley be used for along the circumference arrange in around the unit head, adjacent two the rotation axis of pulley is the obtuse angle and arranges.
According to the utility model provides a pair of unit head device that multiple times promoted, the pulley is provided with two, is first pulley and second pulley respectively, first pulley with form corresponding osculum end and macrostoma end between the second pulley, osculum end orientation the frame that slides, first pulley with the second pulley for the symmetry is personally submitted to the axial symmetry along its slip direction on the frame that slides.
According to the utility model discloses a multiple-rate promotes unit head device, the load seat includes load platform and pulley holder, pulley holder install in load bench keeps away from one side of headstock, the last installation that rotates of pulley holder the pulley.
The embodiment of the utility model provides a rig is still provided, include as above the unit head device that the multiple times rate promoted.
According to the utility model provides a drilling machine, which comprises a mast and a suspension anchor frame; the lifting anchor frame is arranged on the mast; the lifting anchor frame comprises a first cantilever beam, a second cantilever beam and a cross beam; one end of the first cantilever beam and one end of the second cantilever beam form an acute angle, one end of the cross beam is connected with the middle part of the first cantilever beam, and the other end of the cross beam is connected with the middle part of the second cantilever beam; the fixed pulley structure is characterized in that a first fixed pulley is installed at the other end of the first cantilever beam, a second fixed pulley is installed on the cross beam, a third fixed pulley is installed at the other end of the second cantilever beam, the first fixed pulley coincides with the vertical projection of the first pulley, and the third fixed pulley coincides with the vertical projection of the second pulley.
The embodiment of the utility model provides a pair of unit head device and rig that multiple times promoted, through setting up the load seat, set up the pulley on the load seat and dodge the structure, and backstop structure and load seat formation backstop on the body of rod that sets up the unit head, then at the in-process that the rig promoted, the power direct action that receives on the pulley is on the load seat, can not produce the effort to sliding frame and power head box, when the drilling rod is played simultaneously, mainly bear the pressure on the drilling rod by the load seat, the interaction force between drilling rod and the power head box has been reduced by a wide margin, power head box has formed effectual protection, the holistic mechanical strength of unit head device has been ensured, the demand that the rig carries out multiple times promotion has been satisfied.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a multiple-rate-elevating power head device provided by the present invention;
fig. 2 is a schematic structural diagram of a drilling machine provided by the present invention;
fig. 3 is a schematic structural view of a suspension anchor frame provided by the present invention.
Reference numerals:
1: a power head device; 11: a sliding frame; 110: a slide base;
111: a transfer rack; 1110: a first yoke plate; 1111: a second yoke plate;
12: a power head box; 13: a force bearing seat; 131: a bearing platform;
132: a pulley bracket; 133: an avoidance structure; 14: a first pulley;
15: a second pulley; 2: a mast; 3: a suspension anchor frame;
31: a first cantilever beam; 32: a second cantilever beam; 33: a cross beam;
4: a first fixed pulley; 5: a second fixed pulley; 6: a third fixed pulley;
7: a fourth fixed pulley; 8: a fifth fixed pulley; 9: a power head;
91: a stop structure; 92: a slewing bearing structure; 10: a righting rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present embodiment provides a multiple-rate-lifting power head device, which is simply referred to as a power head device 1, where the power head device 1 includes a sliding frame 11, a power head box 12, a force-bearing seat 13, and a pulley; the power head box 12 is connected with the sliding frame 11; the force bearing seat 13 and the power head box 12 are arranged along the sliding direction of the sliding frame 11, the force bearing seat 13 is connected with the power head box 12, an avoiding structure 133 is formed on the force bearing seat 13, the avoiding structure 133 is used for a rod body of the power head 9 connected with the power head box 12 to penetrate, a stopping structure 91 is arranged on the rod body of the power head 9, the height of the stopping structure is higher than that of the force bearing seat 13, and the horizontal projection of the stopping structure 91 on the force bearing seat 13 is distributed on the outer side of the area where the avoiding structure 133 is located; the pulley is rotatably mounted on the force bearing seat 13 on the side away from the power head box 12, wherein, in the case of the power head device 1 shown in the present embodiment applied to a long auger drilling machine, the power head 9 may be a CFA drill rod known in the art, which is not illustrated in fig. 1.
Specifically, because the conventional power head device only directly installs the power head in a mechanism hole of a power head box, when a drill rod is pulled up, the power head box is easily damaged by pressure applied to the drill rod. Meanwhile, in order to realize the lifting of multiple multiplying powers, the conventional power head device is provided with a plurality of pulleys mounted on a pulley seat, and the pulley seat is mounted between a left connecting plate and a right connecting plate of the power head device.
In order to solve the above problems, in this embodiment, by providing the force bearing seat 13, the pulley and the power head box 12 are installed on both sides of the force bearing seat 13 along the sliding direction of the sliding frame 11, and the force bearing seat 13 is rotatably connected with the power head, so that in the lifting process of the drilling machine, the force applied to the pulley directly acts on the force bearing seat 13, and does not generate an acting force on the sliding frame 11 and the power head box 12, and meanwhile, when the drill rod of the drilling machine is pulled out, the force bearing seat 13 mainly bears the pressure on the drill rod, and the interaction force between the drill rod and the power head box 12 is greatly reduced, so that the loss of the box body of the power head box 12 is reduced, the power head box 12 is effectively protected, the overall mechanical strength of the power head device 1 is ensured, and the service life of the power head device is prolonged; meanwhile, the pulley is conveniently mounted on the bearing seat 13, and the acting force applied to the whole power head device 1 is mainly concentrated on the bearing seat 13, so that a speed reducing motor with large torsional force can be arranged on the power head box 12, the performance of the drilling machine is improved, and the requirement for multiple-time-rate lifting of the drilling machine is met.
It should be noted that in the embodiment, one side of the sliding frame 11 is provided with a sliding slot, the sliding slot is slidably connected with the side wall of the mast of the drilling machine, and the other side of the sliding frame 11 far away from the sliding slot can be connected with the power head box 12. In the case that the sliding frame 11 is lifted along the mast of the drilling machine, the pulley is rotatably mounted on the upper side surface of the bearing seat 13, and the power head box 12 is directly or indirectly connected to the lower side surface of the bearing seat 13, wherein the rotation axis of the pulley shown in the embodiment is horizontally distributed in order to ensure the stability of the rotation of the pulley and enable the power head device 1 to be lifted stably.
As shown in fig. 1, the slide frame 11 of the present embodiment includes a sliding base 110 and an adapter frame 111, the sliding base 110 is detachably connected to the adapter frame 111, and the adapter frame 111 is detachably connected to the power head box 12 and the force bearing base 13, respectively. Therefore, the reliable connection between the bearing seat 13 and the power head box 12 can be realized under the condition of not changing the structure of the existing power head box 12, the modification difficulty of the existing power head device can be greatly reduced, and the implementation is easy.
As shown in fig. 1, in order to further ensure the reliability and convenience of the connection between the sliding frame 11 and the power head box 12 and between the power head box 12 and the force bearing seat 13, the adapter frame 111 shown in this embodiment includes a first link plate 1110 and a second link plate 1111, the first link plate 1110 is formed on the power head box 12, the first link plate 1110 is perpendicular to the end surface of the sliding seat 110, the second link plate 1111 forms an acute angle with the end surface of the sliding seat 110, one end of the first link plate 1110 is detachably connected to the sliding seat 110 through a pin shaft, the other end of the first link plate 1110 is hinged to one end of the second link plate 1111 through a pin shaft, and the other end of the second link plate 1111 is detachably connected to the sliding seat 110 through a pin shaft. In this way, the first link plate 1110, the second link plate 1111 and the end surface of the sliding seat 110 form a stable triangular structure, wherein the end surface of the sliding seat 110 is a side surface of the sliding seat 110 away from the sliding groove.
It should be noted that in the present embodiment, two sets of adapter brackets 111 are mounted on the sliding base 110 and arranged corresponding to two sides of the sliding direction, and the power head box 12 and the force bearing base 13 are mounted between the two sets of adapter brackets 111.
As shown in fig. 1, the avoiding structure 133 in this embodiment is a through hole formed in the force bearing seat 13, and the through hole is used for a rod body of a drill rod to pass through; the stop structure 91 shown in this embodiment is a flange having a diameter greater than the diameter of the through hole. Therefore, when the drill rod is pulled out, the flange on the drill rod is directly hung on the bearing seat 13, and the bearing seat 13 bears the pressure on the drill rod, so that the power head box 12 is effectively protected.
As shown in fig. 2, the power head box 12 shown in this embodiment is connected to the centering rod 10, the centering rod 10 is disposed parallel to the axis of the drill rod, an adapter which can slide along the axial direction of the centering rod 10 is mounted on the centering rod 10, the adapter is connected to the tail end of the drill rod through a slewing bearing structure 92, wherein a flange on the drill rod is disposed between the slewing bearing structure and the force bearing seat 13.
Preferably, the pulley shown in this embodiment is provided in plurality, and the rotation axes of the plurality of pulleys are distributed on the same plane perpendicular to the sliding direction of the sliding frame 11. Therefore, when the lifting is carried out through the lifting rope penetrating through each pulley, each pulley can realize synchronous lifting, and the lifting stability is ensured; meanwhile, as the pulleys are arranged on the same plane, the difficulty of installation and construction of the pulleys can be greatly simplified.
Based on the further improvement of the above embodiment, in order to realize multi-rate lifting and ensure the compactness of the overall structure of the power head device 1, the pulleys arranged on the force bearing seat 13 in the embodiment are circumferentially arranged around the drill rod, and the rotation axes of two adjacent pulleys are arranged at an obtuse angle.
Specifically, this embodiment sets up arranging of each pulley, has both arranged for the installation of drilling rod and has provided the space of dodging, is convenient for realize the installation to the pulley again. Meanwhile, the rotation axes of the two adjacent pulleys are arranged at an acute angle, so that after the lifting rope is wound around one pulley, the lifting rope is guided by the fixed pulley on the anchor lifting frame 3 to wind around the other adjacent pulley at a proper angle, the lifting effect of the lifting rope is ensured, the service life of the lifting rope is prolonged, and the pulleys can be synchronously and stably lifted.
Based on the further improvement of the above embodiment, the two pulleys shown in this embodiment are respectively the first pulley 14 and the second pulley 15, the first pulley 14 and the second pulley 15 are symmetrically distributed with respect to the axisymmetric plane along the sliding direction of the sliding frame 11, a small opening end and a large opening end are formed between the first pulley 14 and the second pulley 15, and the small opening end of the first pulley 14 and the second pulley 15 faces the sliding frame 11. Here, by setting the installation positions and orientations of the first pulley 14 and the second pulley 15, the limited space on the force bearing seat 13 can be more reasonably utilized, the installation of the first pulley 14 and the second pulley 15 is convenient to realize, and the lifting stability of the drilling machine is ensured. Meanwhile, based on the combined action of the first pulley 14 and the second pulley 15, the power head device 1 shown in the embodiment can realize four-time lifting.
It should be noted that the force bearing base 13 shown in the present embodiment includes a force bearing platform 131 and a pulley bracket 132, the pulley bracket 132 is mounted on the force bearing platform 131 on the side away from the power head box 12, and a pulley is rotatably mounted on the pulley bracket 132, wherein a through hole is opened on the force bearing platform 131. The embodiment is not limited to the installation of the first pulley 14 and the second pulley 15 on the bearing seat 13, and more than three pulleys can be installed on the bearing seat 13 according to the actual lifting requirement of the drilling machine under the condition that the arrangement space of the bearing seat 13 allows, so as to enhance the multi-magnification lifting effect.
Preferably, the embodiment also provides a drilling machine, which comprises the power head device 1 with multiple-rate lifting.
Specifically, the conventional drilling machine generally includes a chassis, a traveling mechanism, a swing mechanism, a mast, an anchor hanger, a hoisting mechanism, and a power head device, wherein the chassis, the traveling mechanism, the swing mechanism, and the hoisting mechanism are not specifically illustrated in fig. 2.
As shown in fig. 2 and 3, the sliding frame 11 of the present embodiment is slidably connected to the sidewall of the mast 2 along the length direction of the mast 2; the anchor lifting frame 3 is arranged at the top end of the mast 2, and the anchor lifting frame 3 is arranged on the mast 2; the suspension and anchoring frame 3 comprises a first cantilever beam 31, a second cantilever beam 32 and a cross beam 33; one end of the first cantilever beam 31 and one end of the second cantilever beam 32 form an acute angle, one end of the cross beam 33 is connected with the middle part of the first cantilever beam 31, and the other end is connected with the middle part of the second cantilever beam 32; the other end of the first cantilever beam 31 is provided with a first fixed pulley 4, the crossbeam 33 is provided with a second fixed pulley 5, the other end of the second cantilever beam 32 is provided with a third fixed pulley 6, the vertical projection of the first fixed pulley 4 and the vertical projection of the first pulley 14 coincide, and the vertical projection of the third fixed pulley 6 and the vertical projection of the second pulley 15 coincide.
Therefore, when the power head device 1 is lifted, one end of a lifting rope on a hoisting mechanism on the drilling machine can be sequentially wound around the first fixed pulley 4, the first pulley 14, the second fixed pulley 5, the second pulley 15 and the third fixed pulley 6 and finally fixed on the anchor frame 3.
As shown in fig. 2, in order to realize that the lifting rope is arranged on the lifting and anchoring frame 3 according to the preset force transmission path, the present embodiment may further be provided with a fourth fixed pulley 7 at one end of the first cantilever beam 31 and a fifth fixed pulley 8 at one end of the second cantilever beam 32. In one arrangement, the lifting rope on the hoisting mechanism can firstly pass through the fourth fixed pulley 7, then sequentially pass through the first fixed pulley 4, the first pulley 14, the second fixed pulley 5, the second pulley 15 and the third fixed pulley 6, and finally be fixed on the anchor frame 3. Correspondingly, in another arrangement path, the lifting rope on the hoisting mechanism may also pass through the fifth fixed pulley 8, then pass through the third fixed pulley 6, the second pulley 15, the second fixed pulley 5, the first pulley 14 and the first fixed pulley 4 in sequence, and finally be fixed on the anchor frame 3, wherein the lifting rope shown in this embodiment may be a steel wire rope known in the art.
Here, this embodiment is through designing first cantilever beam 31, first fixed pulley 4 and first pulley 14 for unanimous arrangement structure on same vertical face, and is designed unanimous arrangement structure with second cantilever beam 32, third fixed pulley 6 and second pulley 15 on same vertical face, can reduce the load on the davit frame 3 by a wide margin for load evenly distributed on the davit frame 3 has ensured the stability when rig is promoted, and has prolonged the life-span of the wire rope of lifting rope.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multiple rate-boosted powerhead apparatus, comprising:
a sliding frame;
the power head box is connected with the sliding frame;
the bearing seat is connected with the sliding frame, an avoiding structure is formed on the bearing seat and is used for a rod body of a power head connected with the power head box to penetrate through, a stopping structure is arranged on the rod body of the power head, the height of the stopping structure is higher than that of the bearing seat, and the horizontal projection of the stopping structure on the bearing seat is distributed on the outer side of the area where the avoiding structure is located;
and the pulley is rotatably arranged on the bearing seat.
2. The power head device with multiple-rate lifting according to claim 1, wherein the bearing seat and the power head box are arranged along the sliding direction of the sliding frame, and the pulley is mounted on one side of the bearing seat far away from the power head box.
3. The multiple-rate-boosting power head device according to claim 1, wherein the sliding frame comprises a sliding base and an adapter frame, the sliding base is detachably connected with the adapter frame, and the adapter frame is detachably connected with the power head box and the bearing base respectively.
4. The power head device with multiple power factor improvement according to claim 3, wherein the adapter rack comprises a first yoke plate and a second yoke plate, the first yoke plate is formed on the power head box, the first yoke plate is perpendicular to the end face of the slide seat, the second yoke plate is at an acute angle with the end face of the slide seat, one end of the first yoke plate is detachably connected with the slide seat, the other end of the first yoke plate is hinged to one end of the second yoke plate, and the other end of the second yoke plate is detachably connected with the slide seat.
5. The power head device with multiple-rate lifting according to claim 1, wherein the avoiding structure is a through hole formed on the bearing seat, the stopping structure is a flange, and the diameter of the flange is larger than that of the through hole.
6. The power head device with multiple power factor improvement according to claim 1, wherein the power head box is connected with a righting rod, the righting rod is arranged in parallel with the axis of the power head, an adapter capable of sliding along the axial direction of the righting rod is mounted on the righting rod, and the adapter is connected with the power head through a slewing bearing structure.
7. The power head device for multiple times of rate lifting according to any one of claims 1 to 6, wherein there are two pulleys, namely a first pulley and a second pulley, and the rotation axes of the first pulley and the second pulley are arranged in an obtuse angle, so that a corresponding small opening end and a corresponding large opening end are formed between the first pulley and the second pulley, the small opening end faces the sliding frame, and the first pulley and the second pulley are symmetrically distributed relative to an axial symmetry plane on the sliding frame along the sliding direction of the sliding frame.
8. The multiple rate elevating power head apparatus of any one of claims 1 to 6, wherein the carrier comprises a carrier platform and a pulley bracket, the pulley bracket is mounted on a side of the carrier platform away from the power head box, and the pulley is rotatably mounted on the pulley bracket.
9. A drilling rig comprising a multiple rate-raising power head apparatus as claimed in any one of claims 1 to 8.
10. The drilling rig of claim 9, comprising a mast, a boom and the multiple rate-raising powerhead apparatus of claim 7; the lifting anchor frame is arranged on the mast; the lifting anchor frame comprises a first cantilever beam, a second cantilever beam and a cross beam; one end of the first cantilever beam and one end of the second cantilever beam form an acute angle, one end of the cross beam is connected with the middle part of the first cantilever beam, and the other end of the cross beam is connected with the middle part of the second cantilever beam; the fixed pulley structure is characterized in that a first fixed pulley is installed at the other end of the first cantilever beam, a second fixed pulley is installed on the cross beam, a third fixed pulley is installed at the other end of the second cantilever beam, the first fixed pulley coincides with the vertical projection of the first pulley, and the third fixed pulley coincides with the vertical projection of the second pulley.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022945402.2U CN214062848U (en) | 2020-12-07 | 2020-12-07 | Multi-magnification-lifting power head device and drilling machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022945402.2U CN214062848U (en) | 2020-12-07 | 2020-12-07 | Multi-magnification-lifting power head device and drilling machine |
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| CN214062848U true CN214062848U (en) | 2021-08-27 |
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| CN202022945402.2U Active CN214062848U (en) | 2020-12-07 | 2020-12-07 | Multi-magnification-lifting power head device and drilling machine |
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