CN218238613U - Tool for measuring bearing run-out above rotor of aviation gas turbine starter - Google Patents
Tool for measuring bearing run-out above rotor of aviation gas turbine starter Download PDFInfo
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- CN218238613U CN218238613U CN202222213353.2U CN202222213353U CN218238613U CN 218238613 U CN218238613 U CN 218238613U CN 202222213353 U CN202222213353 U CN 202222213353U CN 218238613 U CN218238613 U CN 218238613U
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Abstract
The utility model discloses a be used for aviation gas turbine starter rotor top bearing to beat measuring frock is applied to the first section lateral wall and is equipped with the screwed turbine rotor axle, and the cover is equipped with the bearing that awaits measuring on the axle journal of turbine rotor axle, including amesdial fixing device and connecting device, amesdial fixing device is connected with connecting device, connecting device and turbine rotor axle threaded connection. The connecting device comprises a first connecting portion and a second connecting portion, a threaded hole matched with threads of the outer side wall of the first section of the shaft of the turbine rotor is formed in the bottom surface of the first connecting portion in an opening mode, a mounting hole used for mounting the dial indicator fixing device is formed in the second connecting portion, the mounting hole is parallel to the threaded hole and is eccentrically arranged, a placing through hole is formed in the dial indicator fixing device and is coaxially arranged with the mounting hole, and a measuring rod of the dial indicator is perpendicular to the axis of the supporting rod. The utility model discloses can be used for ensureing to measure the accuracy nature of bearing data of beating, satisfy the production maintenance demand.
Description
Technical Field
The utility model relates to an aviation gas turbine starter technical field, concretely relates to be used for aviation gas turbine starter rotor top bearing to beat measuring frock.
Background
The aviation gas turbine starter is a small airplane Auxiliary Power device (APU for short) and is a starter with an upward exhaust port, mainly used for ground starting, cold transfer, false driving, unsealing and oil sealing of an engine, and can also work in a Power assembly state to provide energy required for ground maintenance. Due to the importance of aviation products, the procedures of disassembly, assembly, repair, maintenance, cleaning and the like are required to be carried out every certain operation period. Due to the particularity and the structural complexity of the aircraft gas turbine starter, certain difficulties are brought to the cleaning, the decomposition, the fault detection, the repair, the assembly and the test of the aircraft gas turbine starter, and one of the problems encountered in the aircraft engine inspection process is as follows.
The inner steel of the main bearing of the aviation gas turbine starter is sleeved on a shaft neck of a turbine rotor shaft, the outer steel sleeve is fixed on a bearing elastic support of the shell, the bearing elastic support has a damping effect, and a roller or a ball is arranged in the middle of the bearing elastic support.
The starter needs to accurately measure the jumping value of the bearing above the rotor in the detection step. The starter rotor has a large diameter and is difficult to vertically fix, so that the bearing run-out value above the rotor cannot be directly and accurately measured.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be used for aviation gas turbine starter rotor top bearing beat measuring frock, it can be used for guaranteeing to measure the accuracy nature of bearing beat data, satisfies the production maintenance demand.
In order to solve the technical problem, the utility model discloses a following scheme:
the utility model provides a be used for aviation gas turbine starter rotor top bearing runout measuring frock, be applied to the first section lateral wall and establish the screwed turbine rotor axle, the cover is equipped with the bearing that awaits measuring on the axle journal of turbine rotor axle, including being used for fixed amesdial to make the measuring stick bottom of amesdial support the amesdial fixing device on the outer steel bushing top of bearing that awaits measuring and be used for fixing the connecting device on the turbine rotor axle with amesdial fixing device, amesdial fixing device is connected with connecting device, connecting device and turbine rotor axle threaded connection. The utility model discloses a turbine rotor shaft, dial indicator, connecting device, dial indicator fixing device, turbine rotor shaft, dial indicator fixing device, turbine rotor shaft, the utility model discloses a setting does, setting through connecting device and dial indicator fixing device, can connect connecting device and dial indicator fixing device on turbine rotor shaft, make dial indicator fixing device can be rotatory around turbine rotor shaft along with turbine rotor shaft's rotation, at turbine rotor shaft pivoted in-process, the interior steel ring of bearing that awaits measuring is static for turbine rotor shaft, the outer steel ring of bearing that awaits measuring rotates for turbine rotor shaft, the top of the outer steel ring of bearing that awaits measuring can remove for the measuring stick bottom of dial indicator in turbine rotor shaft pivoted in-process promptly, make the dial indicator measuring stick can measure the value of beating of the top week of the outer steel jacket of bearing that awaits measuring different positions in, can be used for guaranteeing the accuracy nature of measuring bearing beating data, satisfy production maintenance demand.
Further, connecting device includes first connecting portion and second connecting portion, first connecting portion bottom surface opening and inside be equipped with the screw hole of the screw thread matched with of turbine rotor shaft first section lateral wall, be equipped with the mounting hole that is used for installing amesdial fixing device on the second connecting portion, the mounting hole is parallel and eccentric settings with the screw hole, be equipped with the through-hole of placing that is used for placing the bracing piece that is connected with the amesdial on the amesdial fixing device, place the coaxial setting of through-hole and mounting hole, the measuring stick of amesdial sets up with the axis of bracing piece is perpendicular. The connecting device is used for connecting the connecting device with the turbine rotor shaft through the arrangement of the first connecting part; the dial indicator fixing device is connected with the connecting device through the second connecting part; through placing the eccentric settings of through-hole and screw hole, make bracing piece parallel arrangement outside the turbine rotor shaft, make the bracing piece of amesdial can follow the radial top of propping at outer steel bushing of turbine rotor shaft.
Furthermore, the amesdial fixing device is provided with a clamping section for clamping the fastening support rod and a connecting section for connecting the amesdial fixing device to the mounting hole, which form the placing through hole, along the extending direction of the axis of the placing through hole in sequence.
Furthermore, the clamping section is hollow cylinder form, and the clamping section adopts elastic material, is equipped with the opening that extends towards the linkage segment from the clamping section top along the axial on the lateral wall of clamping section, and the clamping section has two centre gripping arms that leave the clearance along outwards extending in opening both sides department, still includes the locking bolt that runs through two centre gripping arms. The clamping section clamping device has the advantages that through the arrangement of the clamping arms and the locking bolt, when the locking bolt is screwed down, the gap between the two clamping arms is reduced, the cross section of the through hole in the section of the clamping section is reduced, and the clamping section can clamp and fasten the supporting rod.
Furthermore, the locking bolt comprises a screw rod and a nut arranged on the end face of the screw rod, through holes enabling the screw rod to penetrate through are formed in the two clamping arms, the screw rod is provided with the nut, the two clamping arms are located between the nut and the nut, and the inner diameter of each through hole is smaller than the inner diameters of the nut and the nut.
Furthermore, the locking bolt comprises a screw rod and a nut arranged on the end face of the screw rod, a through hole for the screw rod to pass through is formed in a clamping arm close to the nut of the locking bolt, and a locking threaded hole matched with threads on the screw rod is formed in a clamping arm far away from the nut of the locking bolt.
Further, the linkage segment passes through threaded connection with the mounting hole, and the bracing piece all is cylindricly with placing the through-hole, and the cross section of centre gripping section is the U-shaped form, and the circular arc section of the cross section of centre gripping section is major arc form. The supporting rod is convenient to rotate through the cylindrical design of the supporting rod and the placing through hole, so that the measuring rod of the dial indicator is perpendicular to the top end of the outer steel sleeve of the bearing to be measured; the arc section of the cross section of the clamping section is designed to be a major arc, so that the contact area between the clamping section and the supporting rod is large, and the clamping effect of the clamping section on the supporting rod is enhanced.
Furthermore, be equipped with between clamping section and the linkage segment and be used for the cover to establish the changeover portion at the bracing piece lateral wall, place the through-hole and run through clamping section, changeover portion, linkage segment in proper order. The effect of the device is that through the setting of the transition section, the contact area of the dial indicator fixing device and the supporting rod can be increased, and the supporting rod is prevented from shaking in the dial indicator fixing device in the process of rotating the turbine rotor shaft, so that the dial indicator is inaccurate in measurement.
Furthermore, a limiting plate is arranged on the outer side wall, close to the connecting section, of the transition section, and the limiting plate is cylindrical, the outer diameter of the limiting plate is larger than that of the connecting section. The installation structure has the advantages that due to the arrangement of the limiting plates, the transition section can be prevented from entering the installation hole, and therefore the contact area between the connecting section and the installation hole is reduced.
Furthermore, the outer contour of the first connecting portion is cylindrical and is coaxial with the threaded hole, and the second connecting portion is a quadrangular prism connected to the outer side wall of the first connecting portion.
Furthermore, the clamping arms are quadrangular prisms arranged in parallel with the placing through hole, and the two clamping arms are arranged in parallel.
The utility model discloses beneficial effect who has:
1. the connecting device and the dial indicator fixing device can be connected to the turbine rotor shaft through the connecting device and the dial indicator fixing device, so that the dial indicator fixing device can rotate around the turbine rotor shaft along with the rotation of the turbine rotor shaft, the inner steel ring of the bearing to be measured is static relative to the turbine rotor shaft in the rotation process of the turbine rotor shaft, the outer steel ring of the bearing to be measured rotates relative to the turbine rotor shaft, namely, the top end of the outer steel ring of the bearing to be measured can move relative to the bottom end of the measuring rod of the dial indicator in the rotation process of the turbine rotor shaft, so that the dial indicator measuring rod can measure the runout values of different positions of the top end of the outer steel sleeve of the bearing to be measured in the circumferential direction, the accuracy of the measured bearing runout data can be ensured, and the production and maintenance requirements can be met;
2. through the setting of centre gripping arm and locking bolt, when screwing up locking bolt, the gap between two centre gripping arms reduces, and the cross-section of putting the through-hole in the district section of centre gripping section reduces in the drive, makes the centre gripping section can the centre gripping fastening bracing piece.
Drawings
Fig. 1 is a schematic perspective view of the present invention;
fig. 2 is a schematic top view of the present invention;
FIG. 3 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 2;
fig. 4 is the structure schematic diagram of the main view of the utility model at the state of measuring the bearing run-out value.
The reference numerals are illustrated below: 1. a turbine rotor shaft; 2. a bearing to be tested; 3. a measuring rod; 4. a dial indicator fixing device; 5. a connecting device; 6. a first connection portion; 7. a second connecting portion; 8. a threaded hole; 9. mounting holes; 10. a support bar; 11. placing the through hole; 12. a clamping section; 13. a connection section; 14. a clamp arm; 15. locking the bolt; 16. a transition section; 17. and a limiting plate.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and the terms are only for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that, unless otherwise explicitly specified or limited, the terms "disposed," "opened," "mounted," "connected," and "connected" are to be construed broadly, e.g., as either a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically 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.
Example 1
The utility model provides a frock for aviation gas turbine starter rotor top bearing runout is measured, as shown in FIG. 1, be applied to first section lateral wall and be equipped with screwed turbine rotor shaft 1, the cover is equipped with bearing 2 that awaits measuring on the axle journal of turbine rotor shaft 1, support amesdial fixing device 4 on the top of bearing 2 that awaits measuring and be used for fixing amesdial fixing device 4 with being used for fixing connecting device 5 on turbine rotor shaft 1 with 3 bottoms of measuring stick that are used for fixed amesdial messenger amesdial, amesdial fixing device 4 is connected with connecting device 5, connecting device 5 and 1 threaded connection of turbine rotor shaft. The utility model has the effects of, setting through connecting device 5 and amesdial fixing device 4, can connect connecting device 5 and amesdial fixing device 4 on turbine rotor shaft 1, make amesdial fixing device 4 can be along with turbine rotor shaft 1's rotation and around turbine rotor shaft 1 is rotatory, at turbine rotor shaft 1 pivoted in-process, the interior steel ring of bearing 2 that awaits measuring is static for turbine rotor shaft 1, the outer steel ring of bearing 2 that awaits measuring rotates for turbine rotor shaft 1, the top of the outer steel ring of bearing 2 that awaits measuring can move for the measuring staff 3 bottom of amesdial in-process at turbine rotor shaft 1 pivoted, make amesdial measuring staff 3 can measure the runout value of the top week of the outer steel jacket of bearing 2 that awaits measuring different positions, can be used for guaranteeing the accuracy of measuring bearing runout data, satisfy production maintenance demand.
Specifically, as shown in fig. 3, connecting device 5 includes first connecting portion 6 and second connecting portion 7, first connecting portion 6 bottom surface opening and inside be equipped with the screw hole 8 of the screw thread matched with of 1 first section lateral wall of turbine rotor shaft, be equipped with the mounting hole 9 that is used for installing amesdial fixing device 4 on the second connecting portion 7, mounting hole 9 is parallel and eccentric settings with screw hole 8, be equipped with on the amesdial fixing device 4 and be used for placing the through-hole 11 of placing of the bracing piece 10 that is connected with the amesdial, place through-hole 11 and the coaxial setting of mounting hole 9, the measuring stick 3 of amesdial sets up with the axis of bracing piece 10 is perpendicular. The function of the connecting device is to connect the connecting device 5 with the turbine rotor shaft 1 by the arrangement of the first connecting part 6; the dial indicator fixing device 4 is connected with the connecting device 5 through the arrangement of the second connecting part 7; through placing the eccentric settings of through-hole 11 and screw hole 8, make bracing piece 10 parallel arrangement outside turbine rotor shaft 1, make the bracing piece 10 of amesdial can follow turbine rotor shaft 1 radially to support on the top of outer steel bushing.
Specifically, as shown in fig. 2, the dial indicator fixing device 4 is sequentially provided with a clamping section 12 for clamping and fastening the supporting rod 10 and a connecting section 13 for connecting the dial indicator fixing device 4 to the mounting hole 9, which form the placing through hole 11, along the axial extension direction of the placing through hole 11.
Specifically, as shown in fig. 1, the clamping section 12 is in a hollow cylindrical shape, the clamping section 12 is made of an elastic material, an opening extending from the top end of the clamping section 12 toward the connecting section 13 along the axial direction is formed in the side wall of the clamping section 12, two clamping arms 14 with a gap left therebetween extend outwards from two sides of the opening of the clamping section 12, and a locking bolt 15 penetrates through the two clamping arms 14. The effect is that, through the setting of centre gripping arm 14 and locking bolt 15, when screwing up locking bolt 15, the gap between two centre gripping arms 14 reduces, and the cross-section of putting through-hole 11 in the district's of centre gripping section 12 reduces, makes centre gripping section 12 can centre gripping fastening bracing piece 10.
Specifically, as shown in fig. 1, the locking bolt 15 includes a screw and a nut disposed on an end surface of the screw, a through hole through which the screw passes is disposed on the clamping arm 14 of the nut close to the locking bolt 15, and a locking threaded hole 8 matched with a thread on the screw is disposed on the clamping arm 14 of the nut far from the locking bolt 15.
Specifically, as shown in fig. 1, fig. 2, and fig. 3, the connecting section 13 is in threaded connection with the mounting hole 9, the supporting rod 10 and the placing through hole 11 are both cylindrical, the cross section of the clamping section 12 is U-shaped, and the arc section of the cross section of the clamping section 12 is U-shaped. The bearing positioning device has the advantages that the cylindrical design of the support rod 10 and the through hole 11 facilitates the rotation of the support rod 10 positioned in the through hole 11, so that the measuring rod 3 of the dial indicator is vertically arranged with the top end of the outer steel sleeve of the bearing 2 to be measured; the arc section of the cross section of the clamping section 12 is designed to be a major arc, so that the contact area between the clamping section 12 and the supporting rod 10 is large, and the clamping effect of the clamping section 12 on the supporting rod 10 is enhanced.
Specifically, as shown in fig. 1, a transition section 16 for sleeving the outer side wall of the support rod 10 is arranged between the clamping section 12 and the connecting section 13, and the through hole 11 sequentially penetrates through the clamping section 12, the transition section 16 and the connecting section 13. The effect is that, through the setting of changeover portion 16, can increase the area of contact of amesdial fixing device 4 and bracing piece 10, avoid rocking in amesdial fixing device 4 at 1 pivoted in-process bracing piece 10 of turbine rotor axle, lead to the measurement of amesdial inaccurate.
Specifically, as shown in fig. 1, a limiting plate 17 is disposed on an outer side wall of the transition section 16 adjacent to the connecting section 13, and the limiting plate 17 is in a cylindrical shape with an outer diameter larger than that of the connecting section 13. The effect is that, through the setting of limiting plate 17, can avoid the changeover portion 16 to enter into mounting hole 9 to the area of contact between linkage segment 13 and the mounting hole 9 has been reduced.
Specifically, as shown in fig. 1, the outer contour of the first connecting portion 6 is a cylindrical shape coaxially disposed with the threaded hole 8, and the second connecting portion 7 is a quadrangular prism connected to the outer side wall of the first connecting portion 6.
Specifically, as shown in fig. 1, the clamping arms 14 are quadrangular prisms arranged in parallel with the placing through hole 11, and the two clamping arms 14 are arranged in parallel.
The working principle of the utility model is explained as follows: specifically, as shown in fig. 4, firstly, the dial indicator fixing device 4 is screwed into the mounting hole 9 through the screw-shaped connecting section 13 until the bottom surface of the limiting plate 17 abuts against the top surface of the second connecting portion 7, then the connecting device 5 provided with the dial indicator fixing device 4 is connected to the top end of the turbine rotor shaft 1 through the threaded hole 8 of the first connecting portion 6, then the supporting rod 10 connected with the dial indicator penetrates through the placing through hole 11, the supporting rod 10 is rotated around the axis of the supporting rod 10, the measuring rod 3 of the dial indicator is perpendicular to the top end of the outer steel sleeve of the bearing 2 to be measured, then the locking bolt 15 is screwed, the clamping section 12 clamps and fastens the supporting rod 10, then the turbine rotor shaft 1 is driven to rotate around the axis of the turbine rotor shaft 1, the inner steel sleeve of the bearing 2 to be measured is fixed on the turbine rotor shaft 1, the inner steel sleeve is stationary relative to the turbine rotor shaft 1, the outer steel sleeve rotates relative to the turbine rotor shaft 1, and in the rotating process, the side wall of the outer steel sleeve generates a bounce value so as to push the bottom end of the measuring rod 3 of the dial indicator, and thus the bounce value of the outer steel sleeve can be measured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and the technical essence of the present invention is that within the spirit and principle of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments are all within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a be used for aviation gas turbine starter rotor top bearing to beat measuring frock, is applied to first section lateral wall and is equipped with threaded turbine rotor shaft (1), and the cover is equipped with bearing (2) that await measuring on the axle journal of turbine rotor shaft (1), its characterized in that: the device comprises a dial indicator fixing device (4) and a connecting device (5), wherein the bottom end of a measuring rod (3) used for fixing the dial indicator makes the dial indicator abut against the top end of an outer steel sleeve of a bearing (2) to be measured, the connecting device (5) is used for fixing the dial indicator fixing device (4) on a turbine rotor shaft (1), the dial indicator fixing device (4) is connected with the connecting device (5), and the connecting device (5) is in threaded connection with the turbine rotor shaft (1).
2. The tool for measuring the bearing runout above the rotor of the aircraft gas turbine starter according to claim 1, wherein: connecting device (5) include first connecting portion (6) and second connecting portion (7), first connecting portion (6) bottom surface opening and inside be equipped with screw thread matched with screw hole (8) of turbine rotor shaft (1) first section lateral wall, be equipped with mounting hole (9) that are used for installing amesdial fixing device (4) on second connecting portion (7), mounting hole (9) are parallel and eccentric settings with screw hole (8), be equipped with on amesdial fixing device (4) and be used for placing through-hole (11) of placing of bracing piece (10) that are connected with the amesdial, place through-hole (11) and coaxial setting of mounting hole (9), measuring stick (3) of amesdial set up with the axis of bracing piece (10) is perpendicular.
3. The tool for measuring the bearing runout above the starter rotor of the aircraft gas turbine as claimed in claim 2, wherein: the dial indicator fixing device (4) is sequentially provided with a clamping section (12) which is used for clamping and fastening the supporting rod (10) and is used for connecting the dial indicator fixing device (4) on the mounting hole (9), wherein the clamping section (12) is used for placing the through hole (11) and is formed in the extending direction of the axis of the through hole (11).
4. The tool for measuring the bearing runout above the rotor of the aircraft gas turbine starter according to claim 3, wherein the tool comprises: the clamping section (12) is hollow cylinder-shaped, an opening extending from the top end of the clamping section (12) towards the connecting section (13) along the axial direction is formed in the side wall of the clamping section (12), two clamping arms (14) with gaps reserved between the two clamping arms are outwards extended at the two sides of the opening of the clamping section (12), and the clamping section further comprises locking bolts (15) penetrating through the two clamping arms (14).
5. The tool for measuring bearing run-out above an aircraft gas turbine starter rotor according to claim 4, wherein: the locking bolt (15) comprises a screw and a nut arranged on the end face of the screw, a through hole for the screw to pass through is formed in a clamping arm (14) close to the nut of the locking bolt (15), and a locking threaded hole (8) matched with threads on the screw is formed in a clamping arm (14) far away from the nut of the locking bolt (15).
6. The tool for measuring bearing run-out above an aircraft gas turbine starter rotor according to claim 3, wherein: connecting segment (13) and mounting hole (9) are through threaded connection, and bracing piece (10) all are cylindricly with placing through-hole (11), and the transversal U shape of personally submitting of centre gripping section (12), and the circular arc section of the cross section of centre gripping section (12) is major arc form.
7. The tool for measuring bearing run-out above an aircraft gas turbine starter rotor according to claim 3, wherein: be equipped with between clamping section (12) and linkage segment (13) and be used for the cover to establish changeover portion (16) at bracing piece (10) lateral wall, place through-hole (11) and run through clamping section (12), changeover portion (16), linkage segment (13) in proper order.
8. The tool for measuring the bearing runout above the starter rotor of the aircraft gas turbine as claimed in claim 7, wherein: the outer side wall of the transition section (16) close to the connecting section (13) is provided with a limiting plate (17), and the limiting plate (17) is cylindrical with the outer diameter larger than that of the connecting section (13).
9. The tool for measuring the bearing runout above the starter rotor of the aircraft gas turbine as claimed in claim 2, wherein: the outer contour of the first connecting portion (6) is cylindrical and is coaxial with the threaded hole (8), and the second connecting portion (7) is a quadrangular prism connected to the outer side wall of the first connecting portion (6).
10. The tool for measuring bearing run-out above an aircraft gas turbine starter rotor according to claim 4, wherein: the clamping arms (14) are quadrangular prisms arranged in parallel with the placing through hole (11), and the two clamping arms (14) are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222213353.2U CN218238613U (en) | 2022-08-23 | 2022-08-23 | Tool for measuring bearing run-out above rotor of aviation gas turbine starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222213353.2U CN218238613U (en) | 2022-08-23 | 2022-08-23 | Tool for measuring bearing run-out above rotor of aviation gas turbine starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218238613U true CN218238613U (en) | 2023-01-06 |
Family
ID=84684399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222213353.2U Active CN218238613U (en) | 2022-08-23 | 2022-08-23 | Tool for measuring bearing run-out above rotor of aviation gas turbine starter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218238613U (en) |
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2022
- 2022-08-23 CN CN202222213353.2U patent/CN218238613U/en active Active
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