CN222066810U - Prestressed anchor rod installer - Google Patents
Prestressed anchor rod installer Download PDFInfo
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- CN222066810U CN222066810U CN202420928733.0U CN202420928733U CN222066810U CN 222066810 U CN222066810 U CN 222066810U CN 202420928733 U CN202420928733 U CN 202420928733U CN 222066810 U CN222066810 U CN 222066810U
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- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 239000011435 rock Substances 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000006378 damage Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 230000005489 elastic deformation Effects 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 206010061245 Internal injury Diseases 0.000 description 1
- 208000014735 Tooth injury Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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Abstract
本实用新型公开一种预应力锚杆安装器，属于锚杆安装装置技术领域，用于对预应力锚杆进行预紧，预应力锚杆包括锚杆，锚杆外套设多边形连接套，多边形连接套外套设有托盘，多边形连接套上螺纹连接有螺母，包括外壳，外壳内转动连接有第一齿轮，第一齿轮一端开设有用于容纳螺母的多边形槽，外壳上设置有与第一齿轮的齿轮段传动连接的第一驱动组件；还包括内套，内套位于外壳远离多边形槽的一端，第一齿轮上开设有与多边形槽连通的通孔，内套一端伸入通孔内并与多边形连接套的外壁螺纹连接，外壳上设置有与内套连接的轴向拉伸组件。本实用新型可降低对扭矩的要求，从而施加较小的扭矩实现预紧工作，同时降低对螺母的损伤。
The utility model discloses a prestressed anchor bolt installer, which belongs to the technical field of anchor bolt installation devices and is used for pre-tightening prestressed anchor bolts. The prestressed anchor bolts include anchor bolts, a polygonal connecting sleeve is arranged outside the anchor bolt, a tray is arranged outside the polygonal connecting sleeve, a nut is threadedly connected to the polygonal connecting sleeve, and the utility model includes an outer shell, a first gear is rotatably connected inside the outer shell, a polygonal groove for accommodating the nut is provided at one end of the first gear, a first driving component is provided on the outer shell for transmission connection with the gear segment of the first gear; and an inner sleeve is also provided, the inner sleeve is located at one end of the outer shell away from the polygonal groove, a through hole connected to the polygonal groove is provided on the first gear, one end of the inner sleeve extends into the through hole and is threadedly connected to the outer wall of the polygonal connecting sleeve, and an axial stretching component connected to the inner sleeve is provided on the outer shell. The utility model can reduce the requirement for torque, thereby applying a smaller torque to achieve pre-tightening work, while reducing damage to the nut.
Description
Technical Field
The utility model relates to the technical field of anchor rod installation devices, in particular to a prestressed anchor rod installer.
Background
In the tunneling process of the underground tunnel of the coal mine, the tunnel needs to be supported so as to prevent surrounding rock of the tunnel from being deformed or collapsed due to the influence of ground stress. The most commonly used method of support is anchor cable and anchor rod combined support, the surrounding rock and the bedrock are integrated by applying pretightening force, and an integral and stable rock band is formed around the roadway, so that the aim of maintaining the roadway stability is fulfilled by utilizing the combined action of the anchor rod, the anchor cable and the surrounding rock.
The pre-tightening force of the anchor rod is generally used for tightening the nut through an anchor rod drilling machine or a nut installing machine (commonly known as a wind gun). But the torque that the jumbolter can provide can only reach 150n.m at maximum, so the torque of the jumbolter is small.
The torque of the nut mounting machine is large, and the maximum torque is 1500N.m, but if the nut is improperly operated in the process of tightening the nut, the screw or the nut can be damaged, and even sliding teeth or internal injury can occur. Although it sometimes appears that the nut is tightened, in practice damage may already be approached.
For this purpose, a prestressed anchor rod installer is proposed.
Disclosure of utility model
The utility model aims to provide a prestress anchor rod installer which aims to solve or improve at least one of the technical problems.
In order to achieve the above object, the present utility model provides the following solutions: the utility model provides a prestress anchor rod installer, which is used for pre-tightening a prestress anchor rod, wherein the prestress anchor rod comprises an anchor rod, a polygonal connecting sleeve is sleeved outside the anchor rod, a tray is sleeved outside the polygonal connecting sleeve, and a nut is connected to the polygonal connecting sleeve through threads, and the prestress anchor rod installer is characterized by comprising:
The locking mechanism comprises a shell, a first gear is rotationally connected to the shell, a polygonal groove for accommodating the nut is formed in one end of the first gear, and a first driving assembly in transmission connection with a gear section of the first gear is arranged on the shell;
The tensioning mechanism comprises an inner sleeve, the inner sleeve is located at one end, far away from the polygonal groove, of the outer shell, a through hole communicated with the polygonal groove is formed in one end, far away from the polygonal groove, of the first gear, one end of the inner sleeve stretches into the through hole and is in threaded connection with the outer wall of the polygonal connecting sleeve, a gap exists between the through hole and the inner sleeve, and an axial stretching assembly is arranged on the outer shell and used for axially stretching the inner sleeve.
Preferably, the first driving assembly comprises a holding cover fixedly connected to one side of the housing, an opening communicated with the holding cover is formed in the housing, the opening is opposite to the gear section of the first gear, a second gear is rotationally connected to the holding cover, the second gear is meshed with the gear section of the first gear through the opening, one end of the second gear is fixedly connected with a connecting shaft, the connecting shaft is rotationally connected with the holding cover, and one end of the connecting shaft extends out of the holding cover and is provided with a square hole.
Preferably, the axial stretching assembly comprises a cylinder body in threaded connection with the shell, the cylinder body is positioned at one end of the shell far away from the polygonal groove, a piston is connected in a sliding manner in the cylinder body, one end of the piston far away from the shell extends out of the cylinder body, and an oil inlet joint is fixedly connected to one side of the cylinder body; the inner sleeve comprises a large shaft section and a small shaft section, the small shaft section of the inner sleeve penetrates through the piston and the cylinder body and stretches into the through hole, and the large shaft section of the inner sleeve is positioned outside the cylinder body and is in contact with one end of the piston.
Preferably, a connecting ring is fixedly connected to the outer wall of the piston, the outer wall of the connecting ring is slidably connected with the inner wall of the cylinder body, the connecting ring is located between the oil inlet joint and the large shaft end of the inner sleeve, a cover plate is fixedly connected to one end of the cylinder body, which is far away from the outer shell, the piston penetrates through the cover plate, and a reset assembly is arranged on the connecting ring.
Preferably, the reset assembly comprises a plurality of blind holes formed in the connecting ring, springs are fixedly connected in the blind holes, extend out of the blind holes, and are located between the connecting ring and the cover plate.
Preferably, one end of the tray, which is close to the nut, is a spherical surface, one end of the nut, which is close to the tray, is a spherical surface, the spherical surface of the nut is matched with the spherical surface of the tray, one end of the housing, which is close to the polygonal groove, is a spherical surface pad, and a spherical surface pad is arranged between the tray and the housing.
Preferably, the spherical pad is fixedly connected with a connecting sleeve, a limiting ring is fixedly connected on the connecting sleeve, a flange is fixedly connected on the outer wall of the shell, the limiting ring is positioned between the flange and the cylinder body, and the inner diameter of the limiting ring is smaller than the outer diameter of the flange.
Preferably, a retaining ring is fixedly connected to the inner wall of the shell, the retaining ring is located at one end, away from the tray, of the first gear, and the retaining ring is in contact with one end of the first gear.
The utility model discloses the following technical effects: placing the anchor rod and the polygonal connecting sleeve into the rock hole, sleeving a tray outside the polygonal connecting sleeve, enabling the plane end of the tray to be in contact with the rock surface, and screwing a nut onto the polygonal connecting sleeve and contacting with the tray; then pre-tightening is carried out, the nut is placed in the polygonal groove during pre-tightening, the outer shell is in contact with the tray at the moment, the inner sleeve is screwed into a whole through threaded connection with the polygonal connecting sleeve, then the inner sleeve is axially stretched through the axial stretching assembly, at the moment, the polygonal connecting sleeve can generate elastic deformation due to axial stretching, the first gear is driven to rotate through the first driving assembly, so that the nut is driven to rotate, pre-tightening of the nut is achieved, and stretching pre-tightening of the anchor rod is achieved; according to the utility model, the polygonal connecting sleeve is axially stretched and then the nut is screwed, so that the tensioning and pre-tightening work of the anchor rod is realized, the requirement on torque is reduced, the tensioning and pre-tightening of the anchor rod can be realized by applying smaller torque, and meanwhile, the damage to the nut can be reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of the structure of the present utility model;
Fig. 2 is a cross-sectional view taken along the direction A-A in fig. 1.
In the figure: 1. an inner sleeve; 2. a piston; 3. a cover plate; 4. a cylinder; 5. a retainer ring; 6. a housing; 7. connecting sleeves; 8. a spherical pad; 9. a nut; 10. polygonal connecting sleeve; 11. a spring; 12. a tray; 13. a housing cover; 14. a first gear; 15. a second gear; 16. a connecting shaft; 17. an oil inlet joint; 18. a connecting ring; 19. a limiting ring; 20. a flange; 21. polygonal grooves.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1-2, the present utility model provides a prestressed anchor installer for pre-tightening a prestressed anchor, the prestressed anchor includes an anchor, a polygonal connecting sleeve 10 is sleeved outside the anchor, a tray 12 is sleeved outside the polygonal connecting sleeve 10, and a nut 9 is screwed on the polygonal connecting sleeve 10, including:
The locking mechanism comprises a shell 6, a first gear 14 is rotationally connected to the shell 6, a polygonal groove 21 for accommodating a nut 9 is formed in one end of the first gear 14, and a first driving assembly in transmission connection with a gear section of the first gear 14 is arranged on the shell 6;
The tensioning mechanism comprises an inner sleeve 1, wherein the inner sleeve 1 is positioned at one end of the outer shell 6 far away from the polygonal groove 21, a through hole communicated with the polygonal groove 21 is formed at one end of the first gear 14 far away from the polygonal groove 21, one end of the inner sleeve 1 stretches into the through hole and is in threaded connection with the outer wall of the polygonal connecting sleeve 10, a gap exists between the through hole and the inner sleeve 1, an axial tensioning component is arranged on the outer shell 6 and is used for axially tensioning the inner sleeve 1;
Placing an anchor rod and the polygonal connecting sleeve 10 into a rock hole, sleeving a tray 12 outside the polygonal connecting sleeve 10, enabling the plane end of the tray 12 to be in contact with a rock surface, and screwing a nut 9 onto the polygonal connecting sleeve 10 and contacting with the tray 12; then pre-tightening installation is carried out, the nut 9 is placed in the polygonal groove 21 during pre-tightening, the inner sleeve 1 is screwed into a whole with the polygonal connecting sleeve 10 in a threaded connection mode, then the inner sleeve 1 is axially stretched through the axial stretching assembly, at the moment, the polygonal connecting sleeve 10 can generate elastic deformation due to axial stretching, the first gear 14 is driven to rotate through the first driving assembly, the nut 9 is driven to rotate, pre-tightening of the nut 9 is achieved, and stretching pre-tightening of an anchor rod is achieved; according to the application, the polygonal connecting sleeve 10 is axially stretched and then the nut 9 is screwed, so that the tensioning and pre-tightening work of the anchor rod is realized, the requirement on torque is reduced, the tensioning and pre-tightening work of the anchor rod can be realized by applying smaller torque, and meanwhile, the damage to the nut 9 can be reduced.
In a further optimized scheme, the first driving assembly comprises a containing cover 13 fixedly connected to one side of the shell 6, an opening communicated with the containing cover 13 is formed in the shell 6, the opening faces to a gear section of the first gear 14, a second gear 15 is connected in a rotary mode to the containing cover 13, the second gear 15 is meshed with the gear section of the first gear 14 through the opening, one end of the second gear 15 is fixedly connected with a connecting shaft 16, the connecting shaft 16 is connected with the containing cover 13 in a rotary mode, and one end of the connecting shaft 16 extends out of the containing cover 13 and is provided with a square hole;
The ratchet wrench is placed in the square hole to drive the second gear 15 to rotate, so that the first gear 14 is driven to rotate, and the nut 9 is driven to rotate, so that the nut 9 is pre-tightened.
In a further optimized scheme, the axial stretching assembly comprises a cylinder body 4 in threaded connection with the shell 6, the cylinder body 4 is positioned at one end of the shell 6 far away from the polygonal groove 21, the piston 2 is connected in a sliding manner in the cylinder body 4, one end of the piston 2 far away from the shell 6 extends out of the cylinder body 4, and one side of the cylinder body 4 is fixedly connected with an oil inlet joint 17; the inner sleeve 1 comprises a large shaft section and a small shaft section, the small shaft section of the inner sleeve 1 penetrates through the piston 2 and the cylinder body 4 and stretches into the through hole, and the large shaft section of the inner sleeve 1 is positioned outside the cylinder body 4 and is contacted with one end of the piston 2.
According to a further optimization scheme, a connecting ring 18 is fixedly connected to the outer wall of the piston 2, the outer wall of the connecting ring 18 is in sliding connection with the inner wall of the cylinder body 4, the connecting ring 18 is located between the oil inlet joint 17 and the large shaft end of the inner sleeve 1, a cover plate 3 is fixedly connected to one end, far away from the shell 6, of the cylinder body 4, the piston 2 penetrates through the cover plate 3, and a reset assembly is arranged on the connecting ring 18.
Further optimizing scheme, reset assembly include offer in connecting ring 18 blind hole, fixedly connect with spring 11 in the blind hole, spring 11 stretches out of blind hole, spring 11 locates between connecting ring 18 and cover plate 3;
oil is supplied to the cylinder body 4 to push the piston 2 to move, so that the inner sleeve 1 is driven to stretch along the axial direction, and the polygonal connecting sleeve 10 generates elastic deformation due to the axial stretching;
When the oil supply is stopped, the upper cavity of the piston 2 has no pressure, and the lower end surface of the piston 2 is pressed by the elastic force of the spring 11, so that the piston 2 is reset and sequentially reciprocates.
In a further optimization scheme, one end of the tray 12, which is close to the nut 9, is a spherical surface, one end of the nut 9, which is close to the tray 12, is a spherical surface, the spherical surface of the nut 9 is matched with the spherical surface of the tray 12, one end of the shell 6, which is close to the polygonal groove 21, is a spherical surface, a spherical surface pad 8 is arranged between the tray 12 and the shell 6, when the polygonal section of the nut 9 is positioned in the polygonal groove 21, the small end spherical surface of the spherical surface pad 8 is abutted with the spherical surface of the shell 6, and the large end spherical surface of the spherical surface pad 8 is abutted with the spherical surface of the tray 12;
Because the convex-concave of the lower end surface of the tray 12 and the unevenness of the excavated rock roadway can cause poor contact and even point contact of the tray 12 and the nut 9 if planar support is adopted, ideal pretension of the nut cannot be realized, and potential safety hazards are easily caused, therefore, the nut 9 with one end being spherical is adopted and the spherical pad 8 is designed for common support, the contact surfaces of the spherical pad 8, the shell 6 and the tray 12 are all spherical, automatic aligning can be formed, and safe, stable and effective support is realized.
In a further optimization scheme, a connecting sleeve 7 is fixedly connected outside the spherical pad 8, a limiting ring 19 is fixedly connected on the connecting sleeve 7, a flange 20 is fixedly connected on the outer wall of the shell 6, the limiting ring 19 is positioned between the flange 20 and the cylinder body 4, and the inner diameter of the limiting ring 19 is smaller than the outer diameter of the flange 20; so as to prevent the connecting sleeve 7 from falling out of the shell 6, and the upper end surface of the flange 20 is spherical.
In a further optimization scheme, a check ring 5 is fixedly connected to the inner wall of the shell 6, the check ring 5 is positioned at one end of the first gear 14 far away from the tray 12, and the check ring 5 is in contact with one end of the first gear 14; the first gear 14 is supported by the retainer ring 5.
When the multi-gear multi-ring nut is used, firstly, an anchor rod and a polygonal connecting sleeve 10 are placed in a rock hole, a tray 12 is placed, the large plane of the tray 12 faces towards the rock surface, a nut 9 is screwed on the polygonal connecting sleeve 10, the spherical surface of the nut 9 is matched with the spherical surface of the tray 12, and the nut 9 is placed in a polygonal groove 21 of a first gear 14;
Manually rotating the inner sleeve 1 to ensure that the threads of the outer circle at the lower end of the polygonal connecting sleeve 10 are connected with the threads of the inner hole at the upper end of the inner sleeve 1 to form rigid connection, when oil supply begins, the large shaft section of the inner sleeve 1 is abutted against the end surface of the piston 2, the oil pressure pushes the piston 2 to move downwards and drives the inner sleeve 1 to move simultaneously, at the moment, the polygonal connecting sleeve 10 can generate elastic deformation due to axial tensioning, a torque wrench is used for rotating the second gear 15 to drive the first gear 14 to rotate, and the nut 9 is simultaneously rotated in a following way, so that the nut 9 is screwed tightly to realize pretension, and further the tensioning and pretension work of an anchor rod is realized;
The oil supply is stopped, the upper cavity of the piston 2 has no pressure, and the lower end surface of the piston 2 is extruded by the elastic force of the spring 11 at the moment, so that the piston 2 is reset and sequentially reciprocates; the prestress anchor rod installer has the advantages of small volume, light weight, reliable work, quick and convenient use, and labor saving by using the ratchet wrench as an auxiliary tool.
In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.
Claims (8)
1. The utility model provides a prestressing force stock erector for carry out pretension to prestressing force stock, prestressing force stock includes the stock, polygonal connection cover (10) are established to the stock overcoat, polygonal connection cover (10) overcoat is equipped with tray (12), threaded connection has nut (9) on polygonal connection cover (10), a serial communication port, include:
The locking mechanism comprises a shell (6), a first gear (14) is rotationally connected to the shell (6), a polygonal groove (21) for accommodating the nut (9) is formed in one end of the first gear (14), and a first driving assembly in transmission connection with a gear section of the first gear (14) is arranged on the shell (6);
The tensioning mechanism comprises an inner sleeve (1), the inner sleeve (1) is located at one end, far away from the polygonal groove (21), of the outer shell (6), a through hole communicated with the polygonal groove (21) is formed in one end, far away from the polygonal groove (21), of the first gear (14), one end of the inner sleeve (1) stretches into the through hole and is in threaded connection with the outer wall of the polygonal connecting sleeve (10), a gap exists between the through hole and the inner sleeve (1), and an axial stretching assembly is arranged on the outer shell (6) and used for axially stretching the inner sleeve (1).
2. The prestressed rock bolt installer of claim 1, wherein: the first driving assembly comprises a containing cover (13) fixedly connected to one side of the shell (6), an opening communicated with the containing cover (13) is formed in the shell (6), the opening is opposite to the gear section of the first gear (14), a second gear (15) is connected in the containing cover (13) in a rotating mode, the second gear (15) is meshed with the gear section of the first gear (14) through the opening, a connecting shaft (16) is fixedly connected to one end of the second gear (15), the connecting shaft (16) is connected with the containing cover (13) in a rotating mode, and one end of the connecting shaft (16) extends out of the containing cover (13) and is provided with a square hole.
3. The prestressed rock bolt installer of claim 1, wherein: the axial stretching assembly comprises a cylinder body (4) in threaded connection with the shell (6), the cylinder body (4) is positioned at one end of the shell (6) far away from the polygonal groove (21), a piston (2) is connected in a sliding manner in the cylinder body (4), one end of the piston (2) far away from the shell (6) extends out of the cylinder body (4), and an oil inlet joint (17) is fixedly connected at one side of the cylinder body (4); the inner sleeve (1) comprises a large shaft section and a small shaft section, the small shaft section of the inner sleeve (1) penetrates through the piston (2) and the cylinder body (4) and stretches into the through hole, and the large shaft section of the inner sleeve (1) is positioned outside the cylinder body (4) and is in contact with one end of the piston (2).
4. A prestressed anchor installer according to claim 3, wherein: the piston is characterized in that a connecting ring (18) is fixedly connected to the outer wall of the piston (2), the outer wall of the connecting ring (18) is in sliding connection with the inner wall of the cylinder body (4), the connecting ring (18) is located between the oil inlet joint (17) and the large shaft end of the inner sleeve (1), a cover plate (3) is fixedly connected to one end, far away from the shell (6), of the cylinder body (4), the piston (2) penetrates through the cover plate (3), and a reset assembly is arranged on the connecting ring (18).
5. The prestressed anchor installer of claim 4, wherein: the reset assembly comprises a plurality of blind holes formed in the connecting ring (18), springs (11) are fixedly connected in the blind holes, the springs (11) extend out of the blind holes, and the springs (11) are located between the connecting ring (18) and the cover plate (3).
6. A prestressed anchor installer according to claim 3, wherein: the utility model discloses a nut, including nut (9), tray (12), shell (6), shell (12) and shell (6) are provided with spherical pad (8) between, works as the polygon section of nut (9) is located in polygonal groove (21), the tip sphere of spherical pad (8) and the sphere butt of shell (6), the big end sphere of spherical pad (8) and the sphere butt of tray (12).
7. The prestressed anchor installer of claim 6, wherein: the spherical gasket is characterized in that a connecting sleeve (7) is fixedly connected outside the spherical gasket (8), a limiting ring (19) is fixedly connected on the connecting sleeve (7), a flange (20) is fixedly connected on the outer wall of the shell (6), the limiting ring (19) is positioned between the flange (20) and the cylinder body (4), and the inner diameter of the limiting ring (19) is smaller than the outer diameter of the flange (20).
8. The prestressed rock bolt installer of claim 1, wherein: the inner wall of the shell (6) is fixedly connected with a check ring (5), the check ring (5) is positioned at one end of the first gear (14) away from the tray (12), and the check ring (5) is in contact with one end of the first gear (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420928733.0U CN222066810U (en) | 2024-04-29 | 2024-04-29 | Prestressed anchor rod installer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420928733.0U CN222066810U (en) | 2024-04-29 | 2024-04-29 | Prestressed anchor rod installer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222066810U true CN222066810U (en) | 2024-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420928733.0U Active CN222066810U (en) | 2024-04-29 | 2024-04-29 | Prestressed anchor rod installer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222066810U (en) |
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2024
- 2024-04-29 CN CN202420928733.0U patent/CN222066810U/en active Active
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