CN213637448U - Hydraulic permanent magnetic coupler - Google Patents
Hydraulic permanent magnetic coupler Download PDFInfo
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- CN213637448U CN213637448U CN202023093776.2U CN202023093776U CN213637448U CN 213637448 U CN213637448 U CN 213637448U CN 202023093776 U CN202023093776 U CN 202023093776U CN 213637448 U CN213637448 U CN 213637448U
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- permanent magnet
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- 239000004020 conductor Substances 0.000 claims description 26
- 230000008878 coupling Effects 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 6
- 238000005859 coupling reaction Methods 0.000 abstract description 6
- 230000033001 locomotion Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 18
- 238000009434 installation Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009351 contact transmission Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The application discloses a hydraulic permanent magnet coupler. The hydraulic permanent magnet coupler includes: a coupler body; hydraulic pressure wheel hub, hydraulic pressure wheel hub includes that oil storage chamber, inlet port, oil outlet and excircle are protruding, inlet port and oil outlet set up in the excircle is protruding, inlet port and oil outlet respectively with oil storage chamber intercommunication, hydraulic pressure wheel hub with this body coupling of coupler. The coupler body of the hydraulic permanent magnet coupler is connected with the hydraulic hub, and the hydraulic hub has stronger ability of preventing axial motion for the tensioning disc in the prior art, so that the coupler body cannot move axially when in use, and the coupler body can be prevented from being damaged.
Description
Technical Field
The application relates to the technical field of couplers, in particular to a hydraulic permanent magnet coupler.
Background
The permanent magnet coupler is used as a new product and is driven by magnetic force, and the permanent magnet coupler has the characteristic of non-contact transmission, has no mechanical wear and is gradually replacing the traditional contact type transmission product. The permanent magnet coupler generally comprises a conductor disc and a magnet disc, which are respectively connected with an input shaft and/or an output shaft to connect the output shaft and the input shaft of two devices, and when the permanent magnet coupler is connected with an installation shaft, for the convenience of connection and installation, expansion sleeve locking (or called "locking disc") is generally adopted, but the expansion sleeve locking has the following disadvantages: firstly, the contact area is short, so that the contact stress of the shaft surface is large; secondly, the expansion sleeve is expanded by the conical surfaces, and the problems of stress concentration, plastic deformation or corrosion and the like easily occur between the conical surfaces, so that the expansion sleeve cannot be disassembled; thirdly, the expansion sleeve is generally arranged at the shaft end, so that excessive bending moment is easily caused to the mounting shaft, and adverse effects such as temperature rise and sealing damage of a bearing of the linked equipment are caused; fourthly, the conical surface of the expansion sleeve is tightened by the force of the bolt, and during installation, the expansion sleeve needs to be symmetrically screwed and gradually applied with force, and can be screwed only by repeating for many times, so that the installation time is long, and the requirement on workers is high; and fifthly, the bolt is exposed outside and easy to rust, so that the bolt cannot be disassembled.
In the prior art, a locking disc is generally used for connection or split hub connection; the locking disc is short in axial locking size, torque is transmitted by means of strong surface contact pressure, surface stress is large, and axial movement is easy to occur; the split hub clamps the hub on the mounting shaft by means of bolt force, and the clamping force of the hub and the shaft is limited due to the limited bolt force, so that the split hub is easier to axially shift compared with a locking disc structure; axial play of both structures can cause axial contact of the coupler conductor disk with the magnet disk, which can lead to equipment damage.
Accordingly, it would be desirable to have a solution that overcomes or at least alleviates at least one of the above-mentioned difficulties of the prior art.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to provide a hydraulic permanent magnet coupler that overcomes or at least alleviates at least one of the above-mentioned deficiencies of the prior art.
An aspect of the utility model provides a hydraulic pressure permanent magnet coupler, hydraulic pressure permanent magnet coupler includes: a coupler body;
hydraulic wheel hub, it is protruding that hydraulic wheel hub is last to be provided with oil storage chamber, inlet port, oil outlet and excircle, inlet port and oil outlet set up in the excircle is protruding, inlet port and oil outlet respectively with oil storage chamber intercommunication, hydraulic wheel hub with this body coupling is connected, last being provided with of hydraulic wheel hub supplies to treat the through-hole that the installation axle passed.
Optionally, the coupler body comprises a conductor disc and a magnet disc; wherein,
the conductor disc is connected to one of the hydraulic hubs and/or the magnet disc is connected to one of the hydraulic hubs.
Optionally, the hydraulic permanent magnet coupler further comprises an intermediate member, and the conductor disc is connected to one of the hydraulic hubs via the intermediate member and/or the magnet disc is connected to one of the hydraulic hubs via the intermediate member.
Optionally, the outer wall of the hydraulic hub is provided with at least two outer circular protrusions, wherein at least one outer circular protrusion is arranged at one end of the coupler hub, the outer circular protrusion is called a first outer circular protrusion, and the first outer circular protrusion is used for being connected with one of the conductor disc, the magnet disc or the middle piece.
Optionally, at least one of the other outer protrusions except the first outer protrusion is disposed at the other end of the coupling hub and/or at least one of the other outer protrusions except the first outer protrusion is disposed at the middle of the coupling hub.
Optionally, an outer wall groove is formed at the connecting position of the outer wall of the coupling hub and the first outer circular protrusion; the concave direction of the outer wall groove is concave towards the center line direction of the coupler hub.
Optionally, the number of the outer circle protrusions on the other end of the coupler hub is multiple, and the outer circle protrusions are uniformly distributed in the circumferential direction of the coupler hub; an oil inlet hole or an oil outlet hole is arranged on one excircle bulge.
Optionally, the first outer circle protrusion is an annular outer circle protrusion and winds the coupler hub in the circumferential direction, and a groove is formed in the first outer circle protrusion, and the outer wall of the first outer circle protrusion is concave towards the inner wall of the first outer circle protrusion.
Optionally, a taper pin hole and/or a cylindrical pin hole are/is formed in the first outer circular protrusion; wherein,
the conical pin hole is used for being matched with a cylindrical hole in the coupler body for use so as to allow a positioning pin to pass through;
the cylindrical pin hole is used for being matched with a conical pin hole on the coupler body for use, so that a positioning pin can penetrate through the cylindrical pin hole.
Optionally, the hydraulic hub includes an outer sleeve and an inner sleeve, and the oil storage cavity is disposed between the outer sleeve and the inner sleeve;
the middle part of overcoat is provided with radial hole for hoist, the central axis in radial hole for hoist passes through hydraulic pressure wheel hub's focus.
Advantageous effects
The coupler body of the hydraulic permanent magnet coupler is connected with the hydraulic hub, and the hydraulic hub has stronger ability of preventing axial motion for the tensioning disc in the prior art, so that the coupler body cannot move axially when in use, and the coupler body can be prevented from being damaged.
Drawings
Fig. 1 is a schematic structural diagram of a hydraulic permanent magnet coupler according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a hydraulic permanent magnet coupler according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a first embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a second embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a third embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a fourth embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a fifth embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a sixth embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a seventh embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to an eighth embodiment of the present invention.
Reference numerals:
1. a hydraulic hub; 2. a jacket; 3. the excircle is convex; 4. an outer wall groove; 5. an oil inlet hole; 6. an inner sleeve; 7. an oil storage chamber; 9. radial hoisting holes; 10. an oil outlet hole; 11. a coupler body; 111. a conductor disc; 112. a magnetic disk; 12. a middleware; 31. a cylindrical pin hole; 113. a tapered pin hole.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and are not to be considered limiting of the scope of the present application.
Fig. 1 is a schematic structural diagram of a hydraulic permanent magnet coupler according to a first embodiment of the present invention. Fig. 2 is a schematic structural diagram of a hydraulic permanent magnet coupler according to a second embodiment of the present invention. Fig. 3 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a first embodiment of the present invention. Fig. 4 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a second embodiment of the present invention. Fig. 5 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a third embodiment of the present invention. Fig. 6 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a fourth embodiment of the present invention. Fig. 7 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a fifth embodiment of the present invention. Fig. 8 is a schematic structural diagram of a hydraulic hub in a hydraulic permanent magnet coupler according to a sixth embodiment of the present invention.
The hydraulic permanent magnet coupler shown in fig. 1 to 10 comprises a coupler body 11 and a hydraulic hub 1, wherein the hydraulic hub 1 comprises an oil storage cavity 7, an oil inlet hole 5, an oil outlet hole 10 and an outer circle protrusion 3, the oil inlet hole 5 and the oil outlet hole 10 are arranged on the outer circle protrusion 3, the oil inlet hole 5 and the oil outlet hole 10 are respectively communicated with the oil storage cavity 7, and the hydraulic hub 1 is connected with the coupler body 11.
The coupler body of the hydraulic permanent magnet coupler is connected with the hydraulic hub, and the hydraulic hub has stronger ability of preventing axial motion for the tensioning disc in the prior art, so that the coupler body cannot move axially when in use, and the coupler body can be prevented from being damaged.
Referring to fig. 1, in the present embodiment, the coupler body 11 includes a conductor disc 111 and a magnet disc 112; in this case, the conductor disc 111 is connected to a hydraulic hub 1 and the magnet disc 112 is connected to a hydraulic hub 1.
Referring to fig. 1, in the present embodiment, the number of hydraulic hubs 1 is two, one connected to the conductor disc and one connected to the magnet disc.
In other embodiments, the hydraulic hubs are one in number and are connected to either the conductor disc or the magnet disc, and the other of the conductor disc and the magnet disc is connected to another transmission member, it being understood that such transmission member may be a hub or other device.
Referring to fig. 2, in this embodiment, the hydraulic permanent magnet coupling further includes an intermediate member 12 through which the magnet disc 112 is connected to a hydraulic hub 1.
In other embodiments, the magnet disc 112 is connected to one hydraulic hub 1 via an intermediate piece and the conductor disc 111 is connected to one hydraulic hub 1. Alternatively, the conductor disc 111 is connected to a hydraulic hub 1.
Referring to fig. 1 to 8, in the present embodiment, at least two outer circular protrusions 3 are disposed on an outer wall of the hydraulic hub 1, wherein at least one outer circular protrusion 3 is disposed at one end of the hydraulic hub 1, the outer circular protrusion 3 is referred to as a first outer circular protrusion, and the first outer circular protrusion is used for connecting with one of the conductor disc, the magnet disc or the intermediate member.
In the above-described embodiment, to which the first outer circumferential projection is connected is determined according to the connection condition of the hydraulic hub 1.
For example, when the conductor disc 111 is connected to a hydraulic hub 1, the first cylindrical protrusion is connected to the conductor disc.
When the magnet disk 112 is connected to a hydraulic hub 1, the first outer circular projection is connected to the magnet disk 112.
When the conductor disc 111 is connected to a hydraulic hub 1 via the intermediate piece 12, the first cylindrical projection is connected to the intermediate piece 12.
In this embodiment, the first outer circular protrusion is disposed at one end of the hydraulic hub, and it is understood that the first outer circular protrusion may be disposed on an end surface of the one end, or may be disposed at a distance from the end surface, for example, 1cm, 2cm, or the like.
In this embodiment, the first outer circumferential protrusion is an annular outer circumferential protrusion that is circumferentially disposed around the outer wall of the hydraulic hub.
In one embodiment, the number of the first outer circular protrusions is multiple, and each first outer circular protrusion is evenly arranged around the outer wall of the hydraulic hub in the circumferential direction.
In the embodiment that the first outer circular protrusion is annular, a groove is formed in the first outer circular protrusion, and the groove is recessed from the outer wall of the first outer circular protrusion to the inner wall of the first outer circular protrusion.
It will be appreciated that the number of grooves may be set as desired, for example 1, 2, or other numbers.
It will be appreciated that the degree of concavity of the groove may be set as desired, for example, the depth of concavity of the groove may be one half, three quarters or some other degree of thickness of the outer circular protrusion.
Referring to fig. 3, in the present embodiment, a cylindrical pin hole 31 is provided on the first outer circular protrusion; the coupler body is provided with a conical pin hole 113; wherein, the aperture of the taper pin hole 113 is: when the first outer circular bulge is connected with the coupler body, the first outer circular bulge gradually shrinks from one end of the conical pin hole close to the first outer circular bulge to one end far away from the outer circular bulge;
a cylindrical pin hole 31 is adapted to cooperate with a tapered pin hole 113 in the coupler body for passage of a locating pin therethrough.
In this application, the coupler body includes conductor dish and magnet dish, when conductor dish and first excircle arch are connected, is provided with the taper pin hole on the conductor dish.
When the magnet disc is connected with the first outer circular bulge, the magnet disc is provided with a taper pin hole.
When the intermediate piece is connected with the first excircle protrusion, a taper pin hole is formed in the intermediate piece.
During the joining process, there is a possibility that the hydraulic boss is misaligned with one of the conductor disc, the magnet disc or the intermediate member, and at this time, the alignment pins are sequentially inserted through the cylindrical pin holes and the tapered pin holes, guided by the inner walls of the pin holes, so that the two are gradually aligned during the joining process.
Referring to fig. 2 to 5, in the present embodiment, at least one of the first outer protrusions is disposed on the other end of the hydraulic hub 1.
In this embodiment, the first outer circular protrusion is disposed at one end of the hydraulic hub, and the other outer circular protrusion is disposed at the other end of the hydraulic hub.
For convenience of description, the outer circumferential protrusion provided at the other end of the hydraulic hub is referred to as a second outer circumferential protrusion.
In this embodiment, the second outer circular protrusion is an annular protrusion that is disposed around the circumference of the hydraulic hub.
In one embodiment, the number of the second outer circular protrusions is multiple, and the second outer circular protrusions are uniformly distributed in the circumferential direction of the hydraulic hub.
In one embodiment, the second outer circular protrusion is of a ring structure, and a groove is formed in the second outer circular protrusion and is recessed from the outer wall of the second outer circular protrusion to the inner wall.
The number of the grooves can be set according to needs, for example, one, two, three or more grooves are provided.
The depth of the groove can be set according to the requirement.
In this embodiment, the second outer circular protrusion is provided with an oil inlet hole 5 or an oil outlet hole 10.
Referring to fig. 6 and 7, in the present embodiment, at least one of the first outer protrusions is disposed in the middle of the hydraulic hub 1.
For convenience of description, the outer circumferential protrusion disposed at the middle portion is referred to as a third outer circumferential protrusion.
In this embodiment, the third outer circular protrusion is an annular outer circular protrusion.
In this application, the middle part sets up annular protruding, and when the wheel hub atress of this application, the middle part warp most easily, and it is protruding through the excircle that sets up the middle part, can increase the holding capacity at middle part, prevents to warp.
Referring to fig. 8, in the present embodiment, the outer wall of the hydraulic hub 1 has an outer wall groove 4 at the connection position with the first outer circular protrusion; the concave direction of the outer wall groove 4 is concave toward the center line direction of the hydraulic hub 1.
In this embodiment, the outer wall recess includes first section and second section, first section one end and the protruding contact of first excircle, and the other end of first section is connected with the one end of second section.
In this embodiment, the first segment is an arc segment extending and bending from one end to the other end; the second section is a straight line section.
With this structure, the torsional stress at the junction of the outer wall of the hydraulic hub 1 and the first connecting structure can be reduced.
In this embodiment, the hydraulic hub includes an outer sleeve 2 and an inner sleeve 6, and an oil storage chamber 7 is provided between the outer sleeve 2 and the inner sleeve 6.
In the present embodiment, the outer wall is the outer wall of the jacket 2.
In this embodiment, be provided with the axial hole on the endotheca for supply the rotation axis to connect, when using, the rotation axis rotation can drive hydraulic pressure wheel hub rotatory.
Referring to fig. 3, in the present embodiment, the middle of the outer sleeve is provided with a radial hoisting hole 9, and the central axis of the radial hoisting hole 9 passes through the center of gravity of the hydraulic hub 1.
Through being provided with radial hole for hoist, the central axis of radial hole for hoist passes through wheel hub's focus is used for installing rings or other lifting means when using on the radial hole for hoist, when lifting by crane like this, just can guarantee that hydraulic pressure wheel hub's axial hole is the horizontally, and the convenience is adjusted well with the installation axle to realize quick installation.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A hydraulic permanent magnet coupler, comprising:
a coupler body (11);
hydraulic pressure wheel hub (1), hydraulic pressure wheel hub (1) is including oil storage chamber (7), inlet port (5), oil outlet (10) and excircle arch (3), inlet port (5) and oil outlet (10) set up on the excircle arch (3), inlet port (5) and oil outlet (10) respectively with oil storage chamber (7) intercommunication, hydraulic pressure wheel hub (1) with coupler body (11) are connected.
2. A hydraulic permanent magnet coupler according to claim 1, characterized in that the coupler body (11) comprises a conductor disc (111) and a magnet disc (112); wherein,
the conductor disk (111) is connected to one of the hydraulic hubs (1) and/or the magnet disk (112) is connected to one of the hydraulic hubs (1).
3. A hydraulic permanent magnet coupler according to claim 2, characterized in that the hydraulic permanent magnet coupler further comprises an intermediate piece (12), the conductor disc (111) being connected to one of the hydraulic hubs (1) via the intermediate piece (12) and/or the magnet disc (112) being connected to one of the hydraulic hubs (1) via the intermediate piece.
4. A hydraulic permanent magnet coupler according to claim 3, characterized in that at least two cylindrical protrusions (3) are arranged on the outer wall of the hydraulic hub (1), wherein at least one cylindrical protrusion (3) is arranged at one end of the hydraulic hub (1), the cylindrical protrusion (3) is called a first cylindrical protrusion, and the first cylindrical protrusion is used for connecting with one of the conductor disc, the magnet disc or the intermediate piece.
5. A hydraulic permanent magnet coupler according to claim 4, characterized in that at least one of the other cylindrical protrusions, except the first cylindrical protrusion, is arranged at the other end of the hydraulic hub (1) and/or at least one of the other cylindrical protrusions, except the first cylindrical protrusion, is arranged in the middle of the hydraulic hub (1).
6. A hydraulic permanent magnet coupler according to claim 4, characterized in that the outer wall of the hydraulic hub (1) has an outer wall groove (4) at the location where the first outer circular protrusion is connected; the concave direction of the outer wall groove (4) is concave towards the center line direction of the hydraulic hub (1).
7. The hydraulic permanent magnet coupler according to claim 5, wherein the number of the outer circular protrusions (3) on the other end of the hydraulic hub (1) is plural, and each of the outer circular protrusions (3) is uniformly arranged in the circumferential direction of the hydraulic hub (1); an oil inlet hole (5) or an oil outlet hole (10) is arranged on one excircle bulge (3).
8. The hydraulic permanent magnet coupler according to claim 4, wherein the first outer circular protrusion is an annular outer circular protrusion which is circumferentially arranged around the hydraulic hub (1), and a groove which is recessed from the outer wall of the first outer circular protrusion to the inner wall of the first outer circular protrusion is arranged on the first outer circular protrusion.
9. A hydraulic permanent magnet coupler according to claim 8, characterized in that the first cylindrical protrusion is provided with a cylindrical pin hole (31); the coupler body is provided with a conical pin hole (113); wherein,
the aperture of the taper pin hole (113) is as follows: when the first outer circular bulge is connected with the coupler body, the first outer circular bulge gradually shrinks from one end, close to the first outer circular bulge, of the taper pin hole to one end, far away from the outer circular bulge;
one of the cylindrical pin holes (31) is adapted to cooperate with a tapered pin hole (113) in the coupler body for passage of a locating pin therethrough.
10. A hydraulic permanent magnet coupler according to any of claims 1 to 9, characterized in that the hydraulic hub comprises an outer sleeve (2) and an inner sleeve (6), the oil storage chamber (7) being provided between the outer sleeve (2) and the inner sleeve (6);
the middle part of overcoat is provided with radial hole for hoist (9), the central axis of radial hole for hoist (9) passes through hydraulic pressure wheel hub (1)'s focus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023093776.2U CN213637448U (en) | 2020-12-21 | 2020-12-21 | Hydraulic permanent magnetic coupler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023093776.2U CN213637448U (en) | 2020-12-21 | 2020-12-21 | Hydraulic permanent magnetic coupler |
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| CN213637448U true CN213637448U (en) | 2021-07-06 |
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| CN202023093776.2U Active CN213637448U (en) | 2020-12-21 | 2020-12-21 | Hydraulic permanent magnetic coupler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112583229A (en) * | 2020-12-21 | 2021-03-30 | 北京巴什卡科技有限公司 | Hydraulic permanent magnetic coupler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112583229A (en) * | 2020-12-21 | 2021-03-30 | 北京巴什卡科技有限公司 | Hydraulic permanent magnetic coupler |
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