Lifting device for a robot arm support

Abstract

The utility model belongs to lifting device technical field discloses a kind of lifting devices for mechanical arm support. Lifting device for mechanical arm support includes support seat, lifting mechanism and connecting assembly, support seat is equipped with signal line exit, for leading out the signal line of mechanical arm;Lifting mechanism includes threaded rod, driving part, sleeve and protective cover, driving part is connected in protective cover, threaded rod extends along vertical direction and is transmission connection with driving part, another end of threaded rod is rotationally connected in protective cover, sleeve is screwed in threaded rod, driving part drives threaded rod rotation makes sleeve lift along vertical direction;Connecting assembly includes connecting bottom plate and connecting seat, connecting bottom plate is configured to be connected with power concentration car patrol inspection robot, both ends of connecting seat are fixedly connected with sleeve and support seat respectively. The utility model provides lifting device for mechanical arm support, can be installed on power concentration car patrol inspection robot, improve the operation range of mechanical arm, improve the overhaul efficiency of power concentration car.

Description

Technical Field

[0001] This utility model relates to the field of lifting device technology, and in particular to a lifting device for supporting a robotic arm. Background Technology

[0002] In the daily maintenance of power centralized vehicles, photographing the exterior and key components is a crucial step in ensuring the safe operation of the trains. By capturing high-definition images, maintenance personnel can inspect the vehicle body for scratches, deformations, loose or missing parts, and promptly troubleshoot and improve safety. Currently, this photographic work is primarily done manually. Maintenance personnel must move around the vehicle with handheld cameras while it is parked, taking pictures of different parts one by one. Manual photography is prone to blurry images due to shaky hands, requiring retakes, resulting in low efficiency and increased workload for maintenance personnel, making it difficult to meet the demands of large-scale, high-efficiency maintenance.

[0003] To address the drawbacks of manual photography, existing technologies are increasingly employing robotic arms equipped with photographic devices for automated image capture. However, when used alone, the robotic arm's lifting height is limited by its length, making it difficult to cover the entire area of ​​the train from roof to undercarriage. This results in some critical components not being fully photographed, impacting the comprehensiveness of maintenance. While lifting devices can be used to increase the robotic arm's working range, existing lifting devices have poor compatibility with robotic arms, and the limited installation space in power-centralized vehicles makes it difficult to accommodate traditional lifting devices. Utility Model Content

[0004] The purpose of this utility model is to provide a lifting device for supporting a robotic arm, which is installed on a power-centralized vehicle inspection robot to increase the working range of the robotic arm and improve the maintenance efficiency of the power-centralized vehicle.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A lifting device for supporting a robotic arm is installed on a power centralized vehicle inspection robot, and a robotic arm is mounted thereon. The robotic arm is connected to a camera for photographing the power centralized vehicle to inspect its condition. The lifting device for supporting the robotic arm includes:

[0007] A support base with a signal line outlet is provided. The support base is connected to the robotic arm, and the signal line of the robotic arm is led out from the signal line outlet.

[0008] A lifting mechanism includes a threaded rod, a driving component, a sleeve, and a protective cover. The threaded rod, the driving component, and the sleeve are disposed inside the protective cover. The driving component is fixedly connected to the protective cover. The threaded rod extends vertically and is drivenly connected to the driving component. The other end of the threaded rod is rotatably connected to the protective cover. The sleeve is threaded and can be screwed onto the threaded rod. The driving component can drive the threaded rod to rotate so that the sleeve can be raised and lowered vertically.

[0009] The connecting assembly includes a connecting base plate and a connecting seat. The connecting base plate is configured to connect with the power centralized vehicle inspection robot. The protective cover is fixedly connected to the top surface of the connecting base plate. One end of the connecting seat is fixedly connected to the sleeve, and the other end of the connecting seat is fixedly connected to the support base.

[0010] The aforementioned lifting device for supporting a robotic arm includes a connecting base comprising a connecting horizontal plate, a connecting vertical plate, and two connecting ribs. The connecting horizontal plate extends horizontally and is fixedly connected to the sleeve. The two connecting ribs extend vertically and are fixedly connected to both sides of the connecting horizontal plate. The connecting vertical plate extends vertically and is fixedly connected to the two connecting ribs. The other end of the connecting vertical plate is fixedly connected to the support base.

[0011] The aforementioned lifting device for supporting a robotic arm includes a connecting bolt in the connecting assembly. The sleeve is provided with a flange, and the flange has a connecting through hole. The connecting cross plate has a connecting threaded hole. The connecting bolt can pass through the connecting through hole and be screwed into the connecting threaded hole to fix the connecting cross plate and the sleeve.

[0012] The aforementioned lifting device for supporting the robotic arm includes a protective cover comprising a protective top plate, a protective side plate, and a protective bottom plate connected together. The protective bottom plate is fixedly connected to the connecting bottom plate, the protective side plate is fixedly connected to the driving component, and the protective top plate is rotatably connected to the threaded rod.

[0013] The aforementioned lifting device for supporting a robotic arm further includes two support arms extending vertically. The support arms are fixedly connected to the connecting base plate, and the two support arms are respectively fixedly connected to both sides of the protective cover.

[0014] The aforementioned lifting device for supporting the robotic arm further includes two reinforcing ribs. Each supporting arm is fixedly connected to one of the reinforcing ribs, and the other end of the reinforcing rib is fixedly connected to the connecting base plate.

[0015] The aforementioned lifting device for supporting robotic arms has a lifting ring fixedly connected to the top of each supporting arm.

[0016] The lifting device for supporting the robotic arm mentioned above includes two connecting blocks in the connecting assembly. The two connecting blocks are respectively fixedly connected to both sides of the support base, and the connecting blocks are slidably connected to the support arm.

[0017] The aforementioned lifting device for supporting a robotic arm includes a guide slider that extends vertically, and a guide groove is provided on the connecting block, allowing the guide slider to slide within the guide groove.

[0018] The aforementioned lifting device for supporting the robotic arm has multiple ventilation holes in its protective cover.

[0019] The beneficial effects of this utility model are:

[0020] This utility model provides a lifting device for supporting a robotic arm. The base plate is fixedly connected to the power centralized vehicle inspection robot via bolts, making connection convenient. The lifting mechanism includes a threaded rod and a sleeve. The threaded rod extends vertically, fully utilizing vertical space and reducing horizontal space occupation, thus improving space utilization. The connecting seat rises and falls with the sleeve on the threaded rod, allowing the support seat to rise and fall vertically, thereby enabling the robotic arm to rise and fall vertically as a whole, increasing the robotic arm's working range and ensuring it can capture images of the power centralized vehicle from all angles. Simultaneously, the connecting seat connects to the sleeve and the support seat at both ends, allowing the robotic arm to be placed on the side of the threaded rod, fully utilizing horizontal space and improving space utilization. The robotic arm unfolds as the sleeve rises to capture vehicle conditions, and folds to the side of the threaded rod as the sleeve falls, reducing space occupation. This utility model provides a lifting device for supporting a robotic arm that can be installed on a power centralized vehicle inspection robot, increasing the robotic arm's working range and improving the maintenance efficiency of the power centralized vehicle. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the cooperation between the lifting device for supporting the robotic arm and the robotic arm from a first-view perspective, provided in an embodiment of this utility model.

[0022] Figure 2 This is a schematic diagram of the cooperation between the lifting device for supporting the robotic arm and the robotic arm from a second perspective, according to an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the cooperation between the lifting device for supporting the robotic arm and the robotic arm from a third-person perspective, provided in an embodiment of this utility model.

[0024] Figure 4 This is a schematic diagram of the structure of the protective cover provided in this embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the connection seat and sleeve provided in an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the sleeve provided in an embodiment of the present utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the connector provided in an embodiment of the present utility model.

[0028] In the picture:

[0029] 1. Support base; 11. Signal cable outlet;

[0030] 2. Lifting mechanism; 21. Threaded rod; 22. Driving component; 23. Sleeve; 231. Flanged edge; 2311. Connecting through hole; 24. Protective cover; 241. Protective top plate; 242. Protective side plate; 2421. Ventilation hole; 243. Protective bottom plate;

[0031] 3. Connecting components; 31. Connecting base plate; 32. Connecting seat; 321. Connecting horizontal plate; 3211. Connecting threaded hole; 3212. Mounting hole; 322. Connecting vertical plate; 323. Connecting rib plate; 33. Connecting bolt; 34. Connecting block;

[0032] 4. Support arm; 41. Guide slider;

[0033] 5. Reinforce the ribs;

[0034] 6. Hanging rings;

[0035] 7. Buffer plate;

[0036] 100. Robotic arm. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] The lifting device for supporting the robotic arm provided by this utility model can be installed on the inspection robot of the power centralized vehicle, thereby increasing the working range of the robotic arm and improving the maintenance efficiency of the power centralized vehicle.

[0042] like Figures 1-7 As shown, a lifting device for supporting the robotic arm is installed on the power centralized vehicle inspection robot, and a robotic arm 100 is installed thereon. The robotic arm 100 is connected to a camera, which is used to photograph the power centralized vehicle to check its condition. The lifting device for supporting the robotic arm includes a support base 1, a lifting mechanism 2, and a connecting assembly 3. The support base 1 has a signal line outlet 11, and the robotic arm 100 is connected to the support base 1. The signal line of the robotic arm 100 is led out from the signal line outlet 11. The lifting mechanism 2 includes a threaded rod 21, a driving component 22, a sleeve 23, and a protective cover 24. The threaded rod 21, the driving component 22, and the sleeve 23 are arranged inside the protective cover 24. 2. Fixedly connected to the protective cover 24, the threaded rod 21 extends vertically and is connected to the drive component 22. The other end of the threaded rod 21 is rotatably connected to the protective cover 24. The sleeve 23 is threaded and can be screwed to the threaded rod 21. The drive component 22 can drive the threaded rod 21 to rotate so that the sleeve 23 can rise and fall vertically. The connecting assembly 3 includes a connecting base plate 31 and a connecting seat 32. The connecting base plate 31 is configured to connect to the power centralized vehicle inspection robot. The protective cover 24 is fixedly connected to the top surface of the connecting base plate 31. One end of the connecting seat 32 is fixedly connected to the sleeve 23, and the other end of the connecting seat 32 is fixedly connected to the support base 1.

[0043] The lifting device for supporting the robotic arm provided by this utility model is fixedly connected to the power centralized vehicle inspection robot via bolts, using a base plate 31. The lifting mechanism 2 includes a threaded rod 21 and a sleeve 23. The threaded rod 21 extends vertically, making full use of vertical space and reducing horizontal space occupation, thus improving space utilization. The connecting seat 32 rises and falls with the sleeve 23 on the threaded rod 21, allowing the support seat 1 to rise and fall vertically, thereby enabling the robotic arm 100 to rise and fall vertically as a whole, increasing the working range of the robotic arm 100 and ensuring that it can perform all-around imaging of the power centralized vehicle. Simultaneously, the two ends of the connecting seat 32 are connected to the sleeve 23 and the support seat 1 respectively, allowing the robotic arm 100 to be placed on the side of the threaded rod 21, making full use of horizontal space and improving space utilization. The robotic arm 100 unfolds to image the vehicle condition after rising with the sleeve 23, and folds to the side of the threaded rod 21 after falling with the sleeve 23, reducing space occupation. The lifting device for supporting the robotic arm provided by this utility model can be installed on the inspection robot of the power centralized vehicle, thereby increasing the working range of the robotic arm 100 and improving the maintenance efficiency of the power centralized vehicle.

[0044] This embodiment does not specifically limit the shape of the support base 1. For example, the support base 1 is cubic in shape, which is convenient for processing. The top surface of the support base 1 has a mounting threaded hole, and the robotic arm 100 is connected to the mounting threaded hole by existing bolts. The side of the support base 1 has a signal line outlet 11, which is used to lead out the signal line and power line of the robotic arm 100 to provide power to the robotic arm 100. The robotic arm 100 can also be taught through the signal line.

[0045] The protective cover 24 is used to protect the internal threaded rod 21, drive component 22, and sleeve 23, reducing interference from the external environment. For example, see... Figure 2 and Figure 4 The protective cover 24 includes a protective top plate 241, a protective side plate 242, and a protective bottom plate 243 connected together. The protective bottom plate 243 is fixedly connected to the connecting bottom plate 31, the protective side plate 242 is fixedly connected to the driving component 22, the protective top plate 241 is rotatably connected to a threaded rod 21, the protective bottom plate 243 and the connecting bottom plate 31 are fixedly connected, and the connecting bottom plate 31 is fixedly connected to the power centralized vehicle inspection robot, which improves the connection stability of the protective cover 24.

[0046] Optionally, the protective top plate 241, protective side plate 242, and protective bottom plate 243 are fixed by welding, which is convenient and has high connection strength.

[0047] Alternatively, the protective base plate 243 and the connecting base plate 31 can be fixed with existing bolts, which is convenient to connect and can be disassembled for easy maintenance.

[0048] Specifically, see Figure 1 and Figure 2 The drive component 22 is connected to the protective side plate 242 via a buffer plate 7. The buffer plate 7 can be bonded to the inside of the protective side plate 242. The protective side plate 242 has a first through hole, and the buffer plate 7 has a second through hole. Existing bolts can pass through the first and second through holes and be screwed into the threaded holes on the outer wall of the drive component 22 to fix the drive component 22 and the protective side plate 242. The buffer plate 7 can absorb the vibration of the drive component 22 during operation and reduce the impact on the protective cover 24. Specifically, the buffer plate 7 can be a rubber plate.

[0049] Further, see Figure 2 and Figure 4 The protective cover 24 has multiple ventilation holes 2421, which are located on the protective side plate 242. The ventilation holes 2421 are used for ventilation and heat dissipation, reducing the heat of the drive component 22 and improving the service life of the drive component 22.

[0050] Specifically, ventilation holes 2421 are provided on the protective side plate 242, with two holes spaced apart in the vertical direction.

[0051] In other embodiments, three or more ventilation holes 2421 may be provided to increase the ventilation area and improve the heat dissipation effect.

[0052] Alternatively, the drive unit 22 can be an existing motor, with the motor shaft and threaded rod 21 connected by a coupling, ensuring a secure connection and stable rotation.

[0053] Optionally, a speed reducer may also be provided between the drive member 22 and the threaded rod 21 to increase the rotational torque.

[0054] Connector 32 is used to connect sleeve 23 and support 1, see [link / reference] Figure 1 and Figure 7 In this embodiment, the connecting seat 32 includes a connecting horizontal plate 321, a connecting vertical plate 322, and two connecting ribs 323. The connecting horizontal plate 321 extends horizontally and is fixedly connected to the sleeve 23. The two connecting ribs 323 extend vertically and are fixedly connected to both sides of the connecting horizontal plate 321. The connecting vertical plate 322 extends vertically and is fixedly connected to the two connecting ribs 323. The other end of the connecting vertical plate 322 is fixedly connected to the support seat 1. The material is easy to obtain, which can reduce processing costs.

[0055] Specifically, the connecting horizontal plate 321, the connecting vertical plate 322, and the connecting rib plate 323 can be connected by welding, which is convenient and has high connection strength. The connecting horizontal plate 321 has a mounting hole 3212, and the sleeve 23 can be inserted through the mounting hole 3212 and fixed to the connecting horizontal plate 321.

[0056] Furthermore, the connecting vertical plate 322 and the support base 1 are fixed with existing bolts, which is convenient to connect and can be disassembled for easy maintenance.

[0057] The connecting plate 321 can be welded to the sleeve 23 or fixed to the sleeve 23 by bolts. For example, see... Figure 1 , Figure 3 , Figure 5 , Figure 6 and Figure 7 The connecting component 3 also includes a connecting bolt 33. The sleeve 23 is provided with a flange 231, and the flange 231 has a connecting through hole 2311. The connecting horizontal plate 321 has a connecting threaded hole 3211. The connecting bolt 33 can pass through the connecting through hole 2311 and be screwed into the connecting threaded hole 3211 to fix the connecting horizontal plate 321 and the sleeve 23, making the connection convenient.

[0058] During installation, sleeve 23 is screwed onto threaded rod 21, and connecting horizontal plate 321 is fitted onto sleeve 23. The connecting horizontal plate 321 is adjusted so that connecting through hole 2311 and connecting threaded hole 3211 are aligned. Connecting bolt 33 passes through connecting through hole 2311 and is screwed into connecting threaded hole 3211 to fix sleeve 23 and connecting horizontal plate 321.

[0059] To improve the motion stability of the lifting mechanism 2, the lifting device for supporting the robotic arm also includes two vertically extending support arms 4. The support arms 4 are fixedly connected to the connecting base plate 31, and the two support arms 4 are respectively fixedly connected to both sides of the protective cover 24. The support arms 4 extend vertically and are fixed to the connecting base plate 31, forming a double-sided support structure. The force generated by the vibration or shaking of the robotic arm 100 during the lifting process will be transmitted to the protective cover 24, and then to the support arms 4. The two symmetrically distributed support arms 4 can evenly bear the force, offsetting part of the lateral force and improving the stability of the lifting process.

[0060] Specifically, the lifting device for supporting the robotic arm also includes two reinforcing ribs 5. Each supporting arm 4 is fixedly connected to a reinforcing rib 5, and the other end of the reinforcing rib 5 is fixedly connected to the connecting base plate 31. The reinforcing rib 5, the supporting arm 4 and the connecting base plate 31 form a rigid whole, which can increase the moment of inertia of the supporting arm 4, improve the bending resistance of the supporting arm 4 and reduce its deformation under stress. At the same time, the reinforcing rib 5 can absorb some vibration energy, avoid resonance, and further improve the stability of the robotic arm 100 during the lifting process.

[0061] Furthermore, the connecting component 3 also includes two connecting blocks 34, which are fixedly connected to both sides of the support base 1 respectively. The connecting blocks 34 are slidably connected to the support arm 4. The sliding of the connecting blocks 34 to the support arm 4 can provide guidance for the support base 1, prevent the support base 1 from shaking, and improve the stability of the support base 1 during the lifting process.

[0062] The sliding connection between the connecting block 34 and the support arm 4 can be achieved through a slide rail or a slider groove. For example, the support arm 4 includes a guide slider 41 extending vertically. The connecting block 34 has a guide groove, allowing the guide slider 41 to slide within it. During sliding, the large contact area between the guide slider 41 and the groove wall results in more uniform force distribution, preventing stress concentration, improving the service life of the guide slider 41 and the guide groove, and reducing maintenance costs.

[0063] For example, a lifting ring 6 is fixedly connected to the top of each support arm 4. During installation, the lifting ring 6 can be connected by a lifting device to lift the robotic arm support onto the power-concentrated vehicle inspection robot, eliminating the need for workers to carry it and reducing the labor intensity of the staff.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A lifting device for supporting a robotic arm, installed on a power-centralized vehicle inspection robot, and equipped with a robotic arm (100), wherein the robotic arm (100) is connected to a camera, the camera being used to photograph the power-centralized vehicle to inspect its condition, characterized in that, The lifting device for supporting the robotic arm includes: Support base (1), the support base (1) has a signal line outlet (11), the support base (1) is connected to the robotic arm (100), and the signal line of the robotic arm (100) is led out from the signal line outlet (11); The lifting mechanism (2) includes a threaded rod (21), a driving member (22), a sleeve (23), and a protective cover (24). The protective cover (24) contains the threaded rod (21), the driving member (22), and the sleeve (23). The driving member (22) is fixedly connected to the protective cover (24). The threaded rod (21) extends vertically and is connected to the driving member (22). The other end of the threaded rod (21) is rotatably connected to the protective cover (24). The sleeve (23) is threaded and can be screwed onto the threaded rod (21). The driving member (22) can drive the threaded rod (21) to rotate so that the sleeve (23) can rise and fall vertically. The connecting assembly (3) includes a connecting base plate (31) and a connecting seat (32). The connecting base plate (31) is configured to connect with the power centralized vehicle inspection robot. The protective cover (24) is fixedly connected to the top surface of the connecting base plate (31). One end of the connecting seat (32) is fixedly connected to the sleeve (23), and the other end of the connecting seat (32) is fixedly connected to the support seat (1).

2. The lifting device for supporting a robotic arm according to claim 1, characterized in that, The connecting seat (32) includes a connecting horizontal plate (321), a connecting vertical plate (322), and two connecting ribs (323). The connecting horizontal plate (321) extends horizontally and is fixedly connected to the sleeve (23). The two connecting ribs (323) extend vertically and are fixedly connected to both sides of the connecting horizontal plate (321). The connecting vertical plate (322) extends vertically and is fixedly connected to the two connecting ribs (323). The other end of the connecting vertical plate (322) is fixedly connected to the support seat (1).

3. The lifting device for supporting a robotic arm according to claim 2, characterized in that, The connecting assembly (3) further includes a connecting bolt (33), the sleeve (23) is provided with a flange (231), the flange (231) is provided with a connecting through hole (2311), the connecting cross plate (321) is provided with a connecting threaded hole (3211), and the connecting bolt (33) can pass through the connecting through hole (2311) and be screwed into the connecting threaded hole (3211) to fix the connecting cross plate (321) and the sleeve (23).

4. The lifting device for supporting a robotic arm according to claim 1, characterized in that, The protective cover (24) includes a protective top plate (241), a protective side plate (242), and a protective bottom plate (243) connected together. The protective bottom plate (243) is fixedly connected to the connecting bottom plate (31), the protective side plate (242) is fixedly connected to the driving member (22), and the protective top plate (241) is rotatably connected to the threaded rod (21).

5. The lifting device for supporting a robotic arm according to claim 1, characterized in that, The lifting device for supporting the robotic arm also includes two support arms (4) extending in the vertical direction. The support arms (4) are fixedly connected to the connecting base plate (31), and the two support arms (4) are respectively fixedly connected to both sides of the protective cover (24).

6. The lifting device for supporting a robotic arm according to claim 5, characterized in that, The lifting device for supporting the robotic arm also includes two reinforcing ribs (5), each of the supporting arms (4) is fixedly connected to one of the reinforcing ribs (5), and the other end of the reinforcing rib (5) is fixedly connected to the connecting base plate (31).

7. The lifting device for supporting a robotic arm according to claim 5, characterized in that, Each of the support arms (4) has a hanging ring (6) fixedly connected to its top end.

8. The lifting device for supporting a robotic arm according to claim 5, characterized in that, The connecting component (3) also includes two connecting blocks (34), which are fixedly connected to both sides of the support base (1) and slidably connected to the support arm (4).

9. The lifting device for supporting a robotic arm according to claim 8, characterized in that, The support arm (4) includes a guide slider (41) that extends vertically. The connecting block (34) has a guide groove, and the guide slider (41) can slide within the guide groove.

10. The lifting device for supporting a robotic arm according to any one of claims 1-9, characterized in that, The protective cover (24) has multiple ventilation holes (2421).

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