A highway electromechanical maintenance device

CN224858177UActive Publication Date: 2026-10-16YUNNAN YUNLING HIGHWAY ENG CONSULTING CO LTD
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Patent Information

Application Number
CN202522563686.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-12-03
Publication Date
2026-10-16
Estimated Expiration
2035-12-03

AI Technical Summary

Technical Problem

但这种方式存在诸多弊端:安全性差、灵活性低、效率低下和成本较高问题

Benefits of technology

该一种高速公路机电维护保养装置,在进行日常使用的过程中,通过车辆拖拽的方式可以快速将装置移动到指定位置,无需复杂的场地布置和设备调试。而且装置的抬升、角度调整和机械臂操作等功能可以根据实际需求灵活调整,能够适应不同位置和角度的机电设备维保工作。相比传统的升降车和脚手架,该装置的购置、租赁和维护成本较低,而且无需配备专业的操作人员,降低了维护保养的成本。装置不仅具备抬升和角度调整功能,还配备了机械臂结构,能够辅助维护人员进行工具和零件的拿取,满足了高速公路机电设备维护保养的多样化需求。装置的自动化程度较高,减少了人工操作的时间和强度,能够快速将维护人员抬升到指定高度并进行作业,大大提高了维护保养的效率。机械臂杆和夹持主体的辅助拿取功能也进一步提高了作业的便捷性和效率。防护框体为维护人员提供了可靠的安全防护,有效避免了高空坠落等事故的发生,保障了维护人员的生命安全。同时,装置在移动和作业过程中稳定性好,减少了因外界因素干扰导致的安全隐患。

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Abstract

The utility model discloses a kind of highway electromechanical maintenance and servicing device, including supporting bottom block, the two side edges of supporting bottom block are symmetrically provided with supporting wheel body, the one end of supporting bottom block is horizontally fixed and is provided with connecting end block, the top surface of supporting bottom block is horizontally opened with top horizontal groove, the top surface of supporting bottom block is horizontally symmetrically opened with cooperation channel, the degree of automation of device is higher, the time and intensity of manual operation are reduced, can quickly lift maintenance personnel to specified height and work, greatly improve the efficiency of maintenance and servicing.Mechanical arm rod and the auxiliary taking function of clamping main body also further improve the convenience and efficiency of work.Protective frame provides reliable safety protection for maintenance personnel, effectively avoids the occurrence of high-altitude falling and other accidents, ensures the life safety of maintenance personnel.At the same time, the stability of device is good during moving and working process, reduces the security risk caused by external factors interference.
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Description

Technical Field

[0001] This utility model relates to the field of highway technology, specifically a highway electromechanical maintenance device. Background Technology

[0002] With the continuous improvement of my country's expressway network and the increasing mileage of expressways, the number of electromechanical equipment on expressways is also growing. This equipment encompasses various aspects, including toll collection systems, monitoring systems, communication systems, lighting systems, and power supply and distribution systems, playing a crucial role in ensuring the normal operation of expressways and traffic safety. However, expressway electromechanical equipment is constantly exposed to the natural environment, facing harsh weather conditions such as wind, sun, rain, and lightning strikes, as well as the effects of vehicle vibrations and exhaust corrosion, making it prone to malfunctions and damage. Therefore, regular maintenance of expressway electromechanical equipment is a key factor in ensuring its normal operation.

[0003] Currently, the maintenance of highway electromechanical equipment mainly relies on manual labor. When maintaining high-position equipment such as high-mast lights and aerial cameras, the traditional method is to use aerial work platforms or scaffolding, allowing maintenance personnel to operate from these platforms. However, this method has many drawbacks: Poor safety: There are certain safety hazards in the use of aerial work platforms and scaffolding, especially in environments with high traffic volume and high speeds, such as highways. They are easily affected by external factors, such as vehicle collisions and strong winds, which may cause the aerial work platform to sway or the scaffolding to collapse, endangering the lives of maintenance personnel.

[0004] Low flexibility: The movement and adjustment of scaffolding and scaffolding are not flexible enough, requiring a lot of time and effort for site setup and equipment debugging. For some equipment in remote or complex locations, it is difficult to quickly reach the designated location for maintenance.

[0005] Inefficiency: Manual operation is relatively slow, and when working at heights, maintenance personnel need to frequently go up and down the lifting platform or scaffolding, which increases the workload and time cost, resulting in low maintenance efficiency.

[0006] High cost: The purchase, rental and maintenance costs of scaffolding and scaffolding are high, and the need for professional operators further increases maintenance costs. Utility Model Content

[0007] The purpose of this invention is to provide a highway electromechanical maintenance device to address the issue that the maintenance of highway electromechanical equipment, as mentioned in the background section, primarily relies on manual labor. Traditionally, the maintenance of high-position equipment such as high-mast lights and aerial cameras involves using a lift or scaffolding, with maintenance personnel operating from the lift platform or scaffolding. However, this method has many drawbacks: poor safety, low flexibility, low efficiency, and high cost.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a highway electromechanical maintenance device, comprising a support base block, support wheels symmetrically arranged on both sides of the support base block, a connecting end block horizontally fixed at one end of the support base block, a top horizontal groove horizontally formed on the top surface of the support base block, and symmetrically formed mating grooves horizontally formed on the top surface of the support base block. A top-connecting cylinder is connected to the inner side of the top horizontal groove, a telescopic flipping body is arranged on the inner side of the top horizontal groove, a telescopic connecting rod is inserted into the inner side of the mating groove, a side connecting block is fixedly arranged on one side of the telescopic flipping body, and a top connecting block is formed at the top of the telescopic flipping body. The system includes a mating groove, a flipping bottom block that is snapped into the inner side of the top mating groove, a flipping motor that is fixedly installed on one side of the telescopic flipping body, a protective frame that is fixedly installed on the top surface of the flipping bottom block, a top rotating block that is snapped into one end of the telescopic connecting rod, a side motor that is fixedly connected to one side of the top rotating block, a mechanical arm that is connected to the inner side of the top groove of the top rotating block, a clamping body that is connected to one end of the mechanical arm, a flipping inner rod that is horizontally snapped into the inner side of the top horizontal groove, a main power supply that is horizontally snapped into the inner wall of the supporting bottom block, symmetrical inner sleeve holes that are opened on the inner side of the top horizontal groove, and end shafts that are symmetrically inserted into both ends of the flipping inner rod.

[0009] Preferably, there are four support wheels, which are symmetrically arranged at the two corners of the support base block. One end of the connecting end block is fixedly connected to the center of the side of the support base block, and the connecting end block is connected to the rear of the vehicle through a drag structure.

[0010] Preferably, the top horizontal groove is horizontally opened at the center line of the top surface of the support base block, and one end of the top horizontal groove extends through the side wall of the support base block to the outside in an open shape. The matching grooves are parallel and symmetrically opened at the top surface of the support base block near the two sides. The two ends of the top connecting cylinder are connected by connecting rods and are set at the bottom groove of the top horizontal groove and the side groove of the side connecting block.

[0011] Preferably, the bottom end of the telescopic flipping body is fixedly connected to the center of the top surface of the flipping inner rod, the telescopic connecting rod is connected to the inner end of the mating groove through a shaft at one end, and the top mating groove is opened through the center of the top of the telescopic flipping body.

[0012] Preferably, the inner side of the flipping base is provided with a gyroscope structure, and the flipping base is connected to the inner side of the top mating groove through a side shaft. The output end of the flipping motor is fixedly connected to the side shaft end of the flipping base. A limit device is fixedly provided on the other side of the telescopic flipping body, and the top of the flipping base is fixedly connected to the bottom center of the protective frame.

[0013] Preferably, the output end of the side motor is fixedly connected to the shaft end of the robotic arm, the flipping inner rod is horizontally set inside the top horizontal groove near the opening end, the main power supply is horizontally fixed inside the support block near the bottom surface, and one end of the end shaft is horizontally inserted into the inner side of the inner sleeve hole.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This highway electromechanical maintenance device can be quickly moved to a designated location by vehicle towing during daily use, eliminating the need for complex site layout and equipment debugging. Furthermore, the device's lifting, angle adjustment, and robotic arm operation functions can be flexibly adjusted according to actual needs, adapting to maintenance work on electromechanical equipment at different positions and angles. Compared to traditional aerial work platforms and scaffolding, this device has lower purchase, rental, and maintenance costs, and eliminates the need for specialized operators, reducing maintenance costs. In addition to lifting and angle adjustment functions, the device is equipped with a robotic arm structure to assist maintenance personnel in retrieving tools and parts, meeting the diverse needs of highway electromechanical equipment maintenance. The device has a high degree of automation, reducing the time and intensity of manual operation, and can quickly elevate maintenance personnel to a designated height for work, greatly improving maintenance efficiency. The auxiliary retrieval functions of the robotic arm and clamping body further enhance the convenience and efficiency of operations. The protective frame provides reliable safety protection for maintenance personnel, effectively preventing accidents such as falls from heights and ensuring their safety. Meanwhile, the device exhibits good stability during movement and operation, reducing safety hazards caused by external interference. Attached Figure Description

[0015] Figure 1 This is a three-dimensional front view of the present invention; Figure 2 This is a three-dimensional bottom view of the present invention; Figure 3 This is a three-dimensional top view of the present invention; Figure 4 This is a schematic diagram of the overall three-dimensional back structure of this utility model; Figure 5 This is a schematic diagram of the overall separate connection structure of this utility model.

[0016] In the diagram: 1. Support base block; 2. Support wheel body; 3. Connecting end block; 4. Top horizontal groove; 5. Mating groove; 6. Top connecting cylinder; 7. Telescopic flipping body; 8. Telescopic connecting rod; 9. Side connecting block; 10. Top mating groove; 11. Flipping base block; 12. Flipping motor; 13. Protective frame; 14. Top rotating block; 15. Side motor; 16. Mechanical arm rod; 17. Clamping body; 18. Flipping inner rod; 19. Main power supply; 20. Inner sleeve hole; 21. End shaft rod. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1: like Figure 1-5 As shown, this utility model provides a technical solution: a highway electromechanical maintenance device, including a support base 1, support wheels 2 symmetrically arranged on both sides of the support base 1, a connecting end block 3 horizontally fixed at one end of the support base 1, four support wheels 2 symmetrically arranged at the two side corners of the support base 1, one end of the connecting end block 3 fixedly connected to the center of the side of the support base 1, and the connecting end block 3 connected to the rear of the vehicle via a drag structure, a top horizontal groove 4 horizontally opened on the top surface of the support base 1, and symmetrically opened matching grooves 5 horizontally opened on the top surface of the support base 1, a top-connecting cylinder 6 connected to the inner side of the top horizontal groove 4, and the top horizontal groove 4 horizontally opened on the top of the support base 1. The top horizontal groove 4 extends through the side wall of the support base block 1 to the outside in an open shape at the center line position. The mating grooves 5 are parallel and symmetrically opened on the top surface of the support base block 1 near the two sides. The two ends of the top cylinder 6 are connected by connecting rods and are set at the bottom groove of the top horizontal groove 4 and the side groove of the side connecting block 9. The inner side of the top horizontal groove 4 is provided with a telescopic flip body 7. The inner side of the mating groove 5 is inserted with a telescopic connecting rod 8. The side connecting block 9 is fixedly set on one side of the telescopic flip body 7. The bottom end of the telescopic flip body 7 is fixedly connected to the center of the top surface of the flipping inner rod 18. The telescopic connecting rod 8 is connected to the inner end of the mating groove 5 through a shaft. The top mating groove 10 is opened through the center of the top of the telescopic flip body 7.

[0019] The device can be quickly moved to a designated location by being towed by a vehicle, eliminating the need for complex site setup and equipment debugging. Furthermore, the device's lifting, angle adjustment, and robotic arm operation functions can be flexibly adjusted according to actual needs.

[0020] Example 2: like Figure 1-5 As shown, this utility model provides a technical solution: a highway electromechanical maintenance device, including a support base 1, support wheels 2 symmetrically arranged on both sides of the support base 1, a connecting end block 3 horizontally fixedly arranged at one end of the support base 1, four support wheels 2 symmetrically arranged at the two side corners of the support base 1, one end of the connecting end block 3 fixedly connected to the center of the side of the support base 1, and the connecting end block 3 is connected to the rear of the vehicle through a drag structure, and a top surface of the support base 1 is horizontally opened with a top... A horizontal groove 4 is provided, and a matching groove 5 is symmetrically opened on the top surface of the supporting base block 1. A top-connecting cylinder 6 is connected to the inner side of the top horizontal groove 4. The top horizontal groove 4 is horizontally opened at the center line of the top surface of the supporting base block 1, and one end of the top horizontal groove 4 extends through the side wall of the supporting base block 1 to the outside in an open shape. The matching grooves 5 are parallel and symmetrically opened on the top surface of the supporting base block 1 near the two sides. The two ends of the top-connecting cylinder 6 are connected by connecting rods and are set at the bottom groove of the top horizontal groove 4 and the side groove of the side connecting block 9. A telescopic flipping body 7 is provided on the inner side of the top horizontal groove 4. A telescopic connecting rod 8 is inserted into the inner side of the sliding channel 5. A side connecting block 9 is fixedly installed on one side of the telescopic flipping body 7. A top fitting groove 10 is opened at the top of the telescopic flipping body 7. The bottom end of the telescopic flipping body 7 is fixedly connected to the center of the top surface of the flipping inner rod 18. The telescopic connecting rod 8 is connected to the inner end of the sliding channel 5 via a shaft at one end. The top fitting groove 10 is opened through the center of the top of the telescopic flipping body 7. A flipping bottom block 11 is snapped into the inner side of the top fitting groove 10. A flipping motor 12 is fixedly installed on one side of the telescopic flipping body 7. A protective frame 13 is fixedly installed on the top surface of the base block 11. A gyroscope structure is installed on the inner side of the flipping base block 11. The flipping base block 11 is connected to the inner side of the top mating groove 10 through a side shaft. The output end of the flipping motor 12 is fixedly connected to the side shaft end of the flipping base block 11. A limit device is fixedly installed on the other side of the telescopic flipping body 7. The top of the flipping base block 11 is fixedly connected to the bottom center of the protective frame 13. One end of the telescopic connecting rod 8 is engaged with the top rotating block 14. A side motor 15 is fixedly connected to one side of the top rotating block 14.

[0021] The protective frame 13 provides reliable safety protection for maintenance personnel, effectively preventing accidents such as falls from heights and ensuring their safety. At the same time, the device exhibits good stability during movement and operation, reducing safety hazards caused by external interference.

[0022] Example 3: like Figure 1-5As shown, this utility model provides a technical solution: a highway electromechanical maintenance device, including a support base 1, support wheels 2 symmetrically arranged on both sides of the support base 1, a connecting end block 3 horizontally fixed at one end of the support base 1, four support wheels 2 symmetrically arranged at the two corners of the support base 1, one end of the connecting end block 3 fixedly connected to the center of the side of the support base 1, and the connecting end block 3 connected to the rear of the vehicle via a drag structure, a top horizontal groove 4 horizontally opened on the top surface of the support base 1, and symmetrically opened matching grooves 5 horizontally opened on the top surface of the support base 1, a top-connecting cylinder 6 connected to the inner side of the top horizontal groove 4, and the top horizontal groove 4 horizontally opened on the support base 1. The top surface of the support block 1 is positioned at the center line, and one end of the top horizontal groove 4 extends through the side wall of the support block 1 to the outside in an open shape. The mating channels 5 are symmetrically and parallel to each other on the top surface of the support block 1 near both sides. The two ends of the top connecting cylinder 6 are connected by connecting rods and are located at the bottom groove of the top horizontal groove 4 and the side channel of the side connecting block 9. A telescopic flipping body 7 is provided on the inner side of the top horizontal groove 4. A telescopic connecting rod 8 is inserted into the inner side of the mating channel 5. A side connecting block 9 is fixedly provided on one side of the telescopic flipping body 7. A top mating groove 10 is opened at the top of the telescopic flipping body 7. The bottom end of the telescopic flipping body 7 is fixedly connected to the center of the top surface of the flipping inner rod 18. The telescopic connecting rod 8 is connected to the inner end of the mating channel 5 via a shaft at one end. A through-groove groove 10 is formed at the center of the top of the telescopic tilting body 7. A tilting base block 11 is engaged with the inner side of the top groove 10. A tilting motor 12 is fixedly installed on one side of the telescopic tilting body 7. A protective frame 13 is fixedly installed on the top surface of the tilting base block 11. A gyroscope structure is installed on the inner side of the tilting base block 11, and the tilting base block 11 is connected to the inner side of the top groove 10 via a side shaft. The output end of the tilting motor 12 is fixedly connected to the side shaft end of the tilting base block 11. A limit device is fixedly installed on the other side of the telescopic tilting body 7. The top of the tilting base block 11 is fixedly connected to the center of the bottom of the protective frame 13. One end of the telescopic connecting rod 8 is engaged with a top rotating block 14, and one side of the top rotating block 14 is fixed. A side motor 15 is connected to the top of the rotating block 14. A mechanical arm 16 is connected to the inner side of the top channel. A clamping body 17 is connected to one end of the mechanical arm 16. A flipping inner rod 18 is horizontally engaged with the inner side of the top horizontal groove 4. A main power supply 19 is horizontally engaged with the inner wall of the support base block 1. Inner sleeve holes 20 are symmetrically opened on the inner side of the top horizontal groove 4. End shafts 21 are symmetrically inserted at both ends of the flipping inner rod 18. The output end of the side motor 15 is fixedly connected to the shaft end of the mechanical arm 16. The flipping inner rod 18 is horizontally positioned on the inner side of the top horizontal groove 4 near the opening end. The main power supply 19 is horizontally fixed on the inner side of the support base block 1 near the bottom surface. One end of the end shaft 21 is horizontally inserted into the inner side of the inner sleeve hole 20.

[0023] The device boasts a high degree of automation, reducing the time and intensity of manual operations. It can quickly elevate maintenance personnel to a designated height for work, significantly improving maintenance efficiency. The auxiliary lifting functions of the robotic arm 16 and the gripping body 17 further enhance the convenience and efficiency of operations.

[0024] Working Principle: The connecting end block 3 at one end of the support base block 1 is connected to the rear of the vehicle via a towing structure, using the vehicle's traction to pull the entire device to the designated location for highway electromechanical equipment maintenance. Four support wheels 2 symmetrically positioned at the corners of the support base block 1 ensure stability during movement. Maintenance personnel stand inside the protective frame 13, which provides a safe operating space and effectively prevents falls or other accidents. The top-connecting cylinder 6 on the inner side of the top horizontal groove 4 is activated, driving the telescopic tilting body 7 upwards within the top horizontal groove 4 via a connecting rod. Simultaneously, the telescopic connecting rod 8 extends and retracts within the mating groove 5 to coordinate with the movement of the telescopic tilting body 7, ensuring the stability of the device's lifting. The end shafts 21 at both ends of the tilting inner rod 18, fixedly connected to the bottom of the telescopic tilting body 7, rotate within the inner sleeve hole 20, assisting in the lifting of the telescopic tilting body 7. As the telescopic tilting body 7 rises, the protective frame 13 also rises, elevating maintenance personnel to a designated height to meet the maintenance needs of high-position electromechanical equipment. When the angle of the protective frame 13 needs to be adjusted, the tilting motor 12 on one side of the telescopic tilting body 7 is activated. The output of the tilting motor 12 drives the tilting base block 11 to rotate around the side shaft within the top mating groove 10, thereby adjusting the angle of the protective frame 13 and allowing maintenance personnel to more easily operate electromechanical equipment at different angles. The gyroscope structure installed on the inner side of the tilting base block 11 can monitor the angle status of the protective frame 13 in real time to ensure the accuracy of the adjustment. The side motor 15 on one side of the top rotating block 14 is activated. The output of the side motor 15 drives the robotic arm 16 to rotate, adjusting the angle and position of the robotic arm 16. The clamping body 17 connected to one end of the robotic arm 16 can assist maintenance personnel in retrieving the tools and parts needed for maintenance, improving work efficiency. Maintenance personnel, inside the protective frame 13, utilize the raised height and adjusted angle of the device to perform maintenance work on the highway's electromechanical equipment using the robotic arm 16 and clamping body 17. After the maintenance work is completed, the top-mounted cylinder 6 retracts, causing the telescopic tilting body 7 to descend, and the protective frame 13 also descends to its initial position. Then, the connecting end block 3 is disconnected from the vehicle's towing structure, and the device is transferred to the next maintenance point or storage location.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A highway electromechanical maintenance device, comprising a support base (1), characterized in that: Support wheels (2) are symmetrically arranged on both sides of the support base block (1). A connecting end block (3) is horizontally fixed at one end of the support base block (1). A top horizontal groove (4) is horizontally opened on the top surface of the support base block (1). A mating groove (5) is horizontally symmetrically opened on the top surface of the support base block (1). A top-connecting cylinder (6) is connected to the inner side of the top horizontal groove (4). A telescopic flipping body (7) is arranged on the inner side of the top horizontal groove (4). A telescopic connecting rod (8) is inserted into the inner side of the mating groove (5). A side connecting block (9) is fixedly arranged on one side of the telescopic flipping body (7). A top mating groove (10) is opened at the top of the telescopic flipping body (7). A flipping base block (11) is snapped into the inner side of the top mating groove (10). A flipping motor (12) is fixedly installed on one side of (7), a protective frame (13) is fixedly installed on the top surface of the flipping base block (11), a top rotating block (14) is snapped at one end of the telescopic connecting rod (8), a side motor (15) is fixedly connected to one side of the top rotating block (14), a mechanical arm rod (16) is connected to the inner side of the top groove of the top rotating block (14), a clamping body (17) is connected to one end of the mechanical arm rod (16), a flipping inner rod (18) is horizontally snapped at the inner side of the top horizontal groove (4), a main power supply (19) is horizontally snapped at the inner wall of the support base block (1), an inner sleeve hole (20) is symmetrically opened on the inner side of the top horizontal groove (4), and an end shaft rod (21) is symmetrically inserted at both ends of the flipping inner rod (18).

2. The electromechanical maintenance device for highways according to claim 1, characterized in that: The number of the support wheels (2) is four, and the four support wheels (2) are symmetrically arranged at the two side corners of the support base block (1). One end of the connecting end block (3) is fixedly connected to the center of the side of the support base block (1), and the connecting end block (3) is connected to the rear of the vehicle through a drag structure.

3. The electromechanical maintenance device for highways according to claim 1, characterized in that: The top horizontal groove (4) is horizontally opened at the center line of the top surface of the support base block (1), and one end of the top horizontal groove (4) extends through the side wall of the support base block (1) to the outside in an open shape. The grooves (5) are parallel and symmetrically opened on the top surface of the support base block (1) near the two sides. The two ends of the top cylinder (6) are connected by a connecting rod to the bottom groove of the top horizontal groove (4) and the side groove of the side connecting block (9).

4. The electromechanical maintenance device for highways according to claim 1, characterized in that: The bottom end of the telescopic flipping body (7) is fixedly connected to the center of the top surface of the flipping inner rod (18). The telescopic connecting rod (8) is connected to the inner end of the mating groove (5) through the shaft at one end. The top mating groove (10) is opened through the center of the top of the telescopic flipping body (7).

5. The electromechanical maintenance device for highways according to claim 1, characterized in that: The inner side of the flipping base (11) is provided with a gyroscope structure, and the flipping base (11) is connected to the inner side of the top mating groove (10) through the side shaft. The output end of the flipping motor (12) is fixedly connected to the side shaft end of the flipping base (11). The other side of the telescopic flipping body (7) is fixedly provided with a limit device. The top of the flipping base (11) is fixedly connected to the bottom center of the protective frame (13).

6. The electromechanical maintenance device for highways according to claim 1, characterized in that: The output end of the side motor (15) is fixedly connected to the shaft end of the mechanical arm (16), the flipping inner rod (18) is horizontally set on the inner side of the top horizontal groove (4) near the opening end, the main power supply (19) is horizontally fixed on the inner side of the support block (1) near the bottom surface, and one end of the end shaft rod (21) is horizontally inserted into the inner side of the inner sleeve hole (20).