CN216780930U - Large-gear large-bearing press-fitting machine - Google Patents
Large-gear large-bearing press-fitting machine Download PDFInfo
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- CN216780930U CN216780930U CN202123031142.9U CN202123031142U CN216780930U CN 216780930 U CN216780930 U CN 216780930U CN 202123031142 U CN202123031142 U CN 202123031142U CN 216780930 U CN216780930 U CN 216780930U
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Abstract
The utility model discloses a large gear and large bearing press-fitting machine which comprises a base, a plurality of stand columns, an upper base body, a bottom press-fitting mechanism and a top press-fitting mechanism, wherein the stand columns are vertically fixed on the side surface of the base, a side baffle is respectively connected between every two adjacent stand columns, the upper base body is fixed at the upper ends of the stand columns and is positioned right above the base, the bottom press-fitting mechanism is arranged on the base and is used for supporting a gear assembly, and the top press-fitting mechanism is fixed below the upper base body and is used for press-fitting downwards to realize the assembly process of a large gear and a large bearing. The big gear big bearing press fitting machine can effectively realize and accomplish the press fitting of gear wheel, gear wheel jump measurement, the process that compresses tightly of big bearing and annex on every side, and big bearing press fitting frock adopts the segmentation structure moreover, and during the big bearing of pressure fitting different specifications, only need change the big bearing press fitting head that corresponds, and need not pull down whole frock, consequently change swiftly convenient, laborsaving, the practicality is high.
Description
Technical Field
The utility model relates to a large-gear large-bearing press-fitting machine, and relates to the technical field of press-fitting equipment of gear box assemblies of motor train units.
Background
When the gear box assembly of the motor train unit is assembled after newly manufactured and repaired, the large gear and the large bearing and surrounding accessories (an oil retainer ring, an oil collector ring and the like) need to be pressed. The press fitting of the large gear is divided into oil injection press fitting and pressing after hot sleeving, and jumping measurement is needed after the large gear is pressed. The press mounting of the large bearing and the surrounding accessories (the oil deflector ring, the oil collector ring and the like) is the press mounting after hot sleeving, the large bearing and the surrounding accessories (the oil deflector ring, the oil collector ring and the like) are positioned on two sides (a wheel side and a motor side) of the large gear, the two sides need to be simultaneously press mounted during the press mounting, and a special tool needs to be manufactured due to the fact that the size of an axle on the motor side is longer.
In order to realize the press mounting of the gear box assembly, the large gear bearing press-mounting machines appear in succession, the common large gear bearing press-mounting machine is divided into an upper press type structure and a lower press type structure according to the loading force mode, the upper press type structure is that a loading oil cylinder is arranged at the top of the equipment, the loading is carried out from top to bottom, a movable workbench can move in and out of a working position, and the gear box assembly is conveniently hung and placed. The press-down structure is used for press-fitting through the ascending of the workbench, and the loading force is applied from bottom to top. In order to realize press mounting of a large bearing on the motor side and surrounding accessories, a common tool at present is a two-half long-cylinder structure, and the two half structures are connected through a hinge and rotate around a hinge pin shaft to open and close. The tool needs to be hoisted on a large bearing, and is hoisted once every time press mounting is completed; different sizes of large bearings need to be configured with different sizes of tools.
In addition, a large bearing press-fitting machine of KANTO company of Japan imported by chiffon belongs to an upward-pressing type structure, is most representative, can carry out press-fitting of a large bearing, cannot carry out press-fitting of a large gear and jump detection, and needs to be taken down when each press-fitting is finished, and needs to be replaced when the press-fitting is carried out next time; the big gear press fitting machine with the downward-pressing structure designed and manufactured by Anhui Rui iron can press fit and big gear bounce measurement of the gear box assembly, but cannot move out due to the ascending and descending type of the workbench, and the gear box assembly is not convenient to hoist.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the large gear and large bearing press-fitting machine can effectively realize press-fitting and jumping measurement of a large gear and press-fitting of a large bearing and surrounding accessories.
In order to solve the technical problems, the utility model is realized by the following technical scheme:
the utility model provides a big gear wheel big bearing press-fitting machine, includes base, stand, upper seat body, bottom pressure-bearing mechanism, top pressure-bearing mechanism, the stand is many and erects and fixes in the base side, is connected with the side shield between two adjacent stands respectively, the upper seat body is fixed in the stand upper end and is in directly over the base, and bottom pressure-bearing mechanism installs on the base and is used for supporting the gear assembly, top pressure-bearing mechanism fixes in upper seat body below and is used for down the assembly process that the pressure equipment realized big gear wheel, big bearing.
Preferably, the bottom pressure-bearing mechanism comprises a workbench, a bottom moving mechanism, a tool base and a pressing sleeve, the workbench is arranged on the base and drives the automatic horizontal movement through the bottom moving mechanism, the tool base is fixed at the middle position of the workbench, and the pressing sleeve is embedded in the tool base.
Preferably, the bottom moving mechanism comprises two first hydraulic cylinders and two first linear guide rails, the two first linear guide rails are fixed on the base, the lower side of the workbench is connected to the first linear guide rails through a sliding block in a sliding mode, and the cylinder body of each first hydraulic cylinder is fixed on the base in the middle of the first linear guide rails and drives the workbench to horizontally move on the first linear guide rails.
Preferably, a first rubber pad is arranged between the workbench and the sliding block.
Preferably, the top pressing mechanism comprises two jacking mechanisms, two upper sliding seats, a movable seat, two tool mounting seat plates, two large bearing press mounting sleeves, a large bearing press mounting head and a horizontal opening and closing mechanism, the two upper sliding seats are respectively fixed on the stand columns at two sides and are positioned below the upper seat body, the jacking mechanisms are fixed at the lower side of the upper seat body and are positioned between the upper sliding seats, the movable part of each jacking mechanism is connected with the movable seat, the movable seat is arranged between the two upper sliding seats, the opposite side surfaces of the upper sliding seats are provided with second linear guide rails, the two side sliding blocks which are in sliding connection with the second linear guide rails are arranged at two sides of the seat body of each movable seat, the two tool mounting seat plates are respectively in sliding connection with the lower side of the movable seat, the horizontal opening and closing mechanism is mounted at the lower side of the movable seat and drives the tool mounting seat plates to horizontally open and close, the two large bearing press mounting sleeves are respectively fixed at the lower sides of the two tool mounting seat plates, the two large bearing press-fitting heads are respectively arranged at the lower ends of the two large bearing press-fitting sleeves, and when the horizontal opening and closing mechanism is in a closed state, the large bearing sleeves and the large bearing press-fitting heads are attached to form an upper double-cylinder structure and a lower double-cylinder structure.
Preferably, the jacking mechanism is set as a second oil cylinder, a cylinder body of the oil cylinder is fixed on the upper part of the upper seat body, a sensor capable of accurately measuring the displacement of the oil cylinder in the press-fitting and pressing processes is arranged in the cylinder body, and a piston rod end of the sensor is arranged downwards, penetrates through the upper seat body and is connected with the movable seat.
Preferably, the outer walls of the two large bearing press-mounting sleeves are provided with upper bolt connecting pieces for connecting and fixing the large bearing press-mounting sleeves, and the outer walls of the two large bearing press-mounting heads are provided with lower bolt connecting pieces for connecting and fixing the large bearing press-mounting sleeves.
Preferably, the lower side of the center of the movable seat and the upper side of the center of the base are both provided with inner holes, an upper center and a center cylinder are respectively fixed in the inner holes, the upper center is an elastic center with a disc spring structure, the center of the elastic center is arranged downwards, and the center of the center cylinder is arranged upwards.
Preferably, both the top tip part of the top tip and the top tip cylinder are rotatable heads.
Preferably, a cooling fan is arranged on the baffle plate on the side face, and an air port of the fan faces the upper end of the tool base.
Compared with the prior art, the utility model has the advantages that: the large gear large bearing press-fitting machine can effectively realize and complete the press-fitting of a large gear, the gear jump measurement, the press-fitting process of a large bearing and surrounding accessories, and the large bearing press-fitting tool adopts a segmented structure, so that when large bearings of different specifications are press-fitted, only the corresponding large bearing press-fitting head needs to be replaced without detaching the whole tool, therefore, the replacement is quick, convenient and labor-saving, and the practicability is high.
Description of the drawings:
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings may be obtained according to the drawings without creative efforts;
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a side partial cross-sectional view of the present invention;
FIG. 3 is an enlarged partial schematic view at A in FIG. 2;
FIG. 4 is an enlarged partial schematic view at B of FIG. 2;
FIG. 5 is a schematic view of the lower part of the front of the present invention without the machine tool shield installed;
FIG. 6 is a schematic front view of the present invention during press fitting of a bull gear;
FIG. 7 is a schematic side sectional view of the present invention during press fitting of a bull gear;
FIG. 8 is a front partial cross-sectional view of the present invention during press-fitting of a large bearing;
fig. 9 is a partially enlarged schematic view at C in fig. 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention:
as shown in fig. 1 to 5, the large gear wheel bearing press mounting machine includes a base 1, a plurality of columns 2, an upper seat 3, a bottom press mechanism, and a top press mechanism, wherein the columns are vertically fixed on the side of the base, two side baffles 4 are respectively connected between two adjacent columns, in this embodiment, the two side baffles are respectively arranged on two sides of the base, and the upper seat is fixed on the upper ends of the columns and is located right above the base.
The bottom pressure-bearing mechanism is installed on the base and used for supporting the gear assembly, in the embodiment, the bottom pressure-bearing mechanism comprises a workbench 6, a bottom moving mechanism, a tool base 7 and a pressure sleeve 8, the workbench is arranged on the base and is driven by the bottom moving mechanism to automatically move horizontally, in the embodiment, the front-back direction of the base is set to be an X direction, the left-right direction of the base is set to be a Y direction, the bottom moving mechanism drives the workbench to freely move horizontally along the X direction, the tool base is fixed in the middle of the workbench and is embedded in the tool base, the periphery of the tool base is used for supporting an outer box body 9 of the gear box assembly, and the pressure sleeve is used for supporting a large gear 10 of the gear assembly, so that the press-mounting process of the large gear is conveniently realized;
further, for improving the mobility stability, bottom moving mechanism includes first pneumatic cylinder 11 and first linear guide 12, and first linear guide is two and fixes on the base, and slider sliding connection is passed through on first linear guide to the downside of workstation, and the cylinder body of first pneumatic cylinder is fixed on the base at first linear guide middle part and is driven the workstation horizontal migration on first linear guide, in addition, for improving the life who supports stability and extension guide, be equipped with first rubber pad 13 between workstation and the slider, then, when the workstation bears, first rubber pad will be stressed and is out of shape, and thickness diminishes, and the position of workstation also descends thereupon. Before the gear wheel or the large bearing is pressed and installed, the workbench only bears the weight of the gear box assembly, the first rubber pad is slightly deformed, and in practical application, the bearing plate 14 is arranged between the base workbench and the base, so that the workbench is not in contact with the bearing plate, a small gap exists between the workbench and the bearing plate, and the workbench can be smoothly moved into and out of a working position. When the gear wheel or the large bearing starts to be pressed, the deformation of the first rubber pad is increased along with the increase of the pressing force, the bottom surface of the workbench is in contact with the bearing plate, the pressing force is transmitted to the base through the bearing plate, and the linear guide rail is prevented from bearing overlarge load. In this way, a large press-fitting force can be borne, the service life of the first linear guide rail can be prolonged, and the specification of the linear guide rail can be selected to be small, so that the cost is reduced, and in addition, in order to improve the safety, a telescopic machine tool protective cover 32 is arranged on the first linear guide rail on the side surface of the workbench.
As shown in fig. 6 to 9, the top pressing mechanism is fixed below the upper base and used for pressing the large gear and the large bearing downwards to realize the assembling process of the large gear and the large bearing. In this embodiment, in order to improve the press-fitting stability and facilitate the control, the top press-down mechanism includes two jacking mechanisms 15, two upper sliding seats 16, two movable seats 17, a tooling installation seat plate 18, a large bearing press-fitting sleeve 19, a large bearing press-fitting head 20, and a horizontal opening and closing mechanism 21, the two upper sliding seats are respectively fixed on the columns at two sides and are located below the upper seat body, the jacking mechanisms are fixed at the lower side of the upper seat body and are located between the two upper sliding seats, the movable part of the jacking mechanism is connected with the movable seats, the movable seats are arranged between the two upper sliding seats, the opposite sides of the upper sliding seats are provided with second linear guide rails 22, the two sides of the seat body of the movable seat are provided with side sliding blocks slidably connected with the second linear guide rails, the two tooling installation seat plates are respectively slidably connected at the lower side of the movable seats, in this embodiment, for improving the stability, the lower side of the movable seats are provided with two third linear guide rails 23 which are oppositely arranged and are arranged along the Y direction, the upside of two frock installation bedplate is equipped with the slider with third linear guide sliding connection, likewise, be equipped with second rubber slab 24 between frock installation bedplate and the slider, therefore the effectual third linear guide that avoids bears too big load, effectively prolongs third linear guide's life.
The horizontal opening and closing mechanism is installed at the sliding seat downside and drives horizontal opening and closing movement about the tool mounting base plate, big bearing press-fitting sleeve is two and fixes respectively at two tool mounting base plate downside, and big bearing press-fitting head is two and installs respectively at two big bearing press-fitting sleeve lower extremes, and when the horizontal opening and closing mechanism was in the closed condition, big bearing sleeve and the laminating of big bearing press-fitting head formed upper and lower binocular structure, in this embodiment, for convenient control, the horizontal opening and closing mechanism opens and closes the hydro-cylinder for the tool. Furthermore, for convenient control, the jacking mechanism is set as a second oil cylinder, the cylinder body of the oil cylinder is fixed on the upper part of the upper seat body and is internally provided with a sensor which can accurately measure the displacement of the oil cylinder in the press fitting and pressing processes, and the end of the piston rod of the jacking mechanism is downwards arranged and penetrates through the upper seat body and is connected with the movable seat. Therefore, when the large bearings with different specifications are pressed, only the corresponding large bearing press fitting head needs to be replaced, and the whole tool does not need to be disassembled, so that the replacement is quick, convenient and labor-saving. In addition, the large bearing press-fitting sleeve and the large bearing press-fitting head are both of two combined structures, namely two half split structures, the two half large bearing press-fitting sleeves are respectively installed on the two tool installation seat plates, and the two tool installation seat plates are pulled by the tool split oil cylinder to control the large bearing press-fitting sleeve and the large bearing press-fitting head to be automatically split, so that labor is saved, and press-fitting efficiency is high.
In this embodiment, in order to improve the stability during the press mounting of the large bearings, the outer walls of the two large bearing press mounting sleeves are provided with upper pin connectors 25 for connecting and fixing the two large bearing press mounting sleeves, and the outer walls of the two large bearing press mounting heads are provided with lower pin connectors 26 for connecting and fixing the two large bearing press mounting heads.
In this embodiment, as shown in fig. 3 and 4, in order to conveniently implement the run-out measuring process of the large gear, inner holes are respectively arranged at the lower side of the center of the movable seat and the upper side of the center of the base, an upper tip 27 and a tip cylinder 28 are respectively fixed in the inner holes, the upper tip is an elastic tip with a disc spring structure, the tip of the elastic tip is arranged downwards, the pointed end of the top cylinder is arranged upwards and corresponds to the inner hole at the lower side of the tool base up and down, the pointed end part of the upper top is corresponding to the upper cylinder mouth of the combined large bearing press-mounting sleeve up and down, and further, but go up top and top cylinder's apical tip portion and be the rotating head, when measuring big gear runout, go up top and top cylinder and withstand the centre bore at axletree both ends respectively, top cylinder with gear box subassembly jack-up take the altitude, make the gear wheel terminal surface break away from and press the cover, carry out the measurement that the gear wheel runout through manual rotatory gear box subassembly.
In order to conveniently cool the compressed gear box assembly, a cooling fan 29 is arranged on the baffle plate positioned on the side face, and an air opening of the fan is arranged towards the upper end of the tool base.
In the actual press-fitting process, firstly, the large bearing press-fitting head is detached, the tool opening and closing oil cylinders are controlled to drive the two large bearing press-fitting sleeves to be opened separately, then the first oil cylinder is controlled to move out of the workbench along the X direction, the press sleeve corresponding to the large gear is replaced, then the large gear with the gear box is placed on the press sleeve, then the lower end of the axle 30 is inserted into the mounting hole in the middle of the large gear, then the second oil cylinder is controlled to extend out of a piston rod, the movable seat is driven to descend, the upper tip is aligned with the central hole in the upper end of the axle, then the upper tip is pressed and elastically retracts, the bottom surface of the movable seat is pressed downwards with the axle, when a dustproof shaft shoulder at the lower end of the axle is pressed against the inner hole step of the tool base, the large gear is pressed and pressed in place, and then pressure is maintained for a certain time.
And then, a large gear is measured, the movable seat is controlled to rise for a certain distance, the upper tip is extended out under the pressure of the disc spring, the tip of the tip cylinder is extended out to prop against the central hole at the lower end of the axle and prop up the axle, the upper tip props against the central hole at the upper end of the axle, and the end face of the large gear is separated from the pressing sleeve. And then manually rotating the large gear to measure the end face runout of the large gear. After the measurement is finished, the center of the center cylinder descends, the center of the center cylinder continues to descend and retract after the pressing sleeve supports the large gear, the movable seat ascends and resets, the movable seat moves out of the workbench, the gear box assembly is lifted out, and then the press mounting and the jumping measurement process of the large gear are finished.
Then, the press mounting process of the large bearing 31 is carried out, the large bearing is installed in a hot sleeve mode, and the pressing is carried out after the hot sleeve is installed. The method comprises the steps of firstly, replacing a corresponding large bearing press-mounting head and a corresponding press sleeve according to the specification of a large bearing, and controlling the large bearing press-mounting sleeve and the large bearing press-mounting head to be opened and separated. Then the workbench is moved out, the gear box assembly after the hot sleeve is completed is placed, the end faces of the two large bearings are made to respectively cling to the upper side faces of the pressing sleeve and the large gear, then the workbench is moved into a working position, the large bearing press-fitting sleeves and the large bearing press-fitting heads are clasped, the bolts are respectively inserted, and then the two large bearing sleeves and the two large bearing press-fitting heads are respectively connected and fixed through the bolt connecting pieces. The piston rod of the second oil cylinder extends out, the movable seat descends, and the large bearing press-mounting head presses the end face of the large bearing at the upper part to press the large bearing tightly and maintain the pressure for a certain time. After the press mounting is completed, the piston rod of the second oil cylinder retracts, and the movable seat rises and resets. And opening the bolt connecting piece, opening the large bearing press-fitting sleeve and the large bearing press-fitting head, moving out the workbench, hanging out the gear box assembly, and then completing the press-fitting process of the large bearing, wherein the installation process of the accessories around the large bearing is the same as that of the large bearing, and the installation of the accessories around the large bearing can be realized by repeating the operation.
It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. A big bearing press-fitting machine of gear wheel which characterized in that: including base, stand, upper base body, bottom pressure-bearing mechanism, top pushing mechanism, the stand is many and erects to be fixed in the base side, is connected with the side shield respectively between two adjacent stands, upper base body fixes in the stand upper end and is in directly over the base, and bottom pressure-bearing mechanism installs on the base and is used for supporting the gear assembly, top pushing mechanism fixes in upper base body below and is used for down the assembly process that the pressure equipment realized gear wheel, big bearing.
2. The bull gear and bull bearing press machine of claim 1, wherein: the bottom pressure-bearing mechanism comprises a workbench, a bottom moving mechanism, a tool base and a pressing sleeve, the workbench is arranged on the base and drives automatic horizontal movement through the bottom moving mechanism, the tool base is fixed at the middle position of the workbench, and the pressing sleeve is embedded in the tool base.
3. The bull gear and bull bearing press machine of claim 2, wherein: the bottom moving mechanism comprises two first hydraulic cylinders and two first linear guide rails, the two first linear guide rails are fixed on the base, the lower side of the workbench is connected to the first linear guide rails through a sliding block in a sliding mode, and the cylinder body of each first hydraulic cylinder is fixed on the base in the middle of the corresponding first linear guide rail and drives the workbench to horizontally move on the corresponding first linear guide rail.
4. The bull gear and bull bearing press machine of claim 3, wherein: a first rubber pad is arranged between the workbench and the sliding block.
5. The bull gear and bull bearing press machine of claim 2, wherein: the top pressing mechanism comprises two jacking mechanisms, two upper sliding seats, two movable seats, a tool mounting seat plate, two large-bearing press-mounting sleeves, a large-bearing press-mounting head and a horizontal opening and closing mechanism, the two upper sliding seats are respectively fixed on the stand columns at two sides and positioned below the upper seat body, the jacking mechanisms are fixed at the lower side of the upper seat body and positioned between the upper sliding seats, the movable parts of the jacking mechanisms are connected with the movable seats, the movable seats are arranged between the two upper sliding seats, the opposite side surfaces of the upper sliding seats are provided with second linear guide rails, the two sides of the seat body of each movable seat are provided with side sliding blocks in sliding connection with the second linear guide rails, the two tool mounting seat plates are respectively in sliding connection with the lower side of the movable seats, the horizontal opening and closing mechanism is arranged at the lower side of the movable seats and drives the tool mounting seat plate to horizontally open and close, the two large-bearing press-mounting sleeves are respectively fixed at the lower sides of the two tool mounting seat plates, the two large bearing press-fitting heads are respectively arranged at the lower ends of the two large bearing press-fitting sleeves, and when the horizontal opening and closing mechanism is in a closed state, the large bearing sleeves and the large bearing press-fitting heads are attached to form an upper double-cylinder structure and a lower double-cylinder structure.
6. The bull gear and bull bearing press machine of claim 5, wherein: the jacking mechanism is set as a second oil cylinder, the cylinder body of the oil cylinder is fixed on the upper part of the upper seat body and is internally provided with a sensor which can accurately measure the displacement of the oil cylinder in the press-fitting and pressing processes, and the end of the piston rod of the jacking mechanism is downwards arranged and penetrates through the upper seat body and is connected with the movable seat.
7. The bull gear and bull bearing press machine of claim 5, wherein: the outer walls of the two large bearing press-mounting sleeves are provided with upper bolt connecting pieces for connecting and fixing the large bearing press-mounting sleeves, and the outer walls of the two large bearing press-mounting heads are provided with lower bolt connecting pieces for connecting and fixing the large bearing press-mounting sleeves.
8. The bull gear and bull bearing press machine of claim 5, wherein: the center lower side of the movable seat and the center upper side of the base are both provided with inner holes, an upper center and a center cylinder are respectively fixed in the inner holes, the upper center is an elastic center of a disc spring structure, the center of the elastic center is arranged downwards, and the center of the center cylinder is arranged upwards.
9. The bull gear and bull bearing press machine of claim 8, wherein: the top head parts of the upper top and the top cylinder are rotatable heads.
10. The bull gear and bull bearing press machine of claim 5, wherein: and a cooling fan is arranged on the baffle plate positioned on the side surface, and the air port of the fan is arranged towards the upper end of the tool base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123031142.9U CN216780930U (en) | 2021-12-02 | 2021-12-02 | Large-gear large-bearing press-fitting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123031142.9U CN216780930U (en) | 2021-12-02 | 2021-12-02 | Large-gear large-bearing press-fitting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216780930U true CN216780930U (en) | 2022-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123031142.9U Active CN216780930U (en) | 2021-12-02 | 2021-12-02 | Large-gear large-bearing press-fitting machine |
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|---|---|
| CN (1) | CN216780930U (en) |
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2021
- 2021-12-02 CN CN202123031142.9U patent/CN216780930U/en active Active
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