Electrical equipment handling device for construction engineering

Abstract

This invention relates to the field of material handling technology, specifically to a material handling device for electrical equipment in construction engineering. It includes a placement platform with a drive groove at its top. An auxiliary handling mechanism is located inside the drive groove. The auxiliary handling mechanism includes a convergence drive assembly sliding within the drive groove. Two orientation adjustment components are located at the top of the convergence drive assembly, and clamping components are located at the ends of the orientation adjustment components. This invention allows the orientation adjustment components to extend outwards. Simultaneously, the convergence drive assembly drives the two clamping components to converge and clamp the outer wall of the electrical equipment. The orientation adjustment components then raise the clamping components to directly above the placement platform, facilitating the placement of the electrical equipment on the platform, saving time and effort. Furthermore, the clamping components further limit the movement of the electrical equipment, improving safety during transport. Additionally, the clamping components can be switched between horizontal and vertical states to accommodate the size of the electrical equipment for clamping and fixing.

Description

Technical Field

[0001] This invention relates to the field of material handling technology, and more specifically, to a material handling device for electrical equipment used in construction engineering. Background Technology

[0002] Construction engineering refers to the physical engineering project formed by the construction of various buildings and their ancillary facilities, as well as the installation of supporting lines, pipes, and equipment. Construction work requires the use of many electrical devices, such as switch cabinets and motors. The actual equipment used may vary depending on the building type and functional requirements. However, most electrical equipment is large and heavy, making it inconvenient to move and requiring the assistance of handling equipment. Currently, most handling equipment is trolley-based, but it has the following drawbacks:

[0003] Firstly, the current placement platform of the handling equipment is a certain distance from the ground, which requires lifting the electrical equipment onto the placement platform before it can be moved with the handling equipment. This is time-consuming and labor-intensive. If other lifting equipment is used, it will increase the cost of the construction project.

[0004] Secondly, when electrical equipment is placed on the platform, it is prone to bumps and vibrations during the transfer process by the moving device. If the electrical equipment is not secured, it may shake and fall, affecting safety.

[0005] Furthermore, when clamping or limiting electrical equipment, existing technologies are not convenient for adjusting the clamping range according to the size of the electrical equipment, which affects the range of auxiliary handling. In view of this, we propose an electrical equipment handling device for construction engineering. Summary of the Invention

[0006] The purpose of this invention is to provide an electrical equipment handling device for construction engineering, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides an electrical equipment handling device for construction engineering, comprising a placement platform, a driving groove on the top of the placement platform, an auxiliary handling mechanism inside the driving groove, and a convergence driving component sliding within the driving groove. The top of the convergence driving component has two symmetrical orientation control components, and the ends of the orientation control components have fitting clamping components. As the orientation control components extend outwards, and the convergence driving component drives the two fitting clamping components to converge and clamp the outer wall of the electrical equipment, the orientation control components then drive the fitting clamping components to rise directly above the placement platform. Wherein:

[0008] The placement platform is provided with a support and blocking mechanism at its edge. The support and blocking mechanism is used to keep the placement platform stable when the clamping assembly is raised and to limit the movement of auxiliary electrical equipment.

[0009] As a further improvement to this technical solution, casters are provided at the four corners of the bottom of the placement platform, and push rods are provided at the edge of the placement platform away from the support and blocking mechanism.

[0010] As a further improvement to this technical solution, the gathering drive assembly includes at least two symmetrical transverse transmission screws that rotate within the drive groove. The outer threads of the two transverse transmission screws are arranged opposite each other and are connected end to end. One of the transverse transmission screws is connected to a motor output shaft at its end.

[0011] The drive groove is equipped with two symmetrical clamping plates that slide inside. The lower ends of the clamping plates are respectively threaded to the outer wall of the transverse transmission screw.

[0012] As a further improvement to this technical solution, the orientation control component includes at least a movable plate that rotates at the end of the clamping plate. The rotating shaft of the movable plate is connected to the output shaft of a movable motor. The housing of the movable motor is fixed to the surface of the clamping plate, and a connecting block is rotatably provided at the end of the movable plate away from the movable motor.

[0013] As a further improvement to this technical solution, the bonding clamping assembly includes at least a bonding frame, the outer surface of which has a groove, the connecting block slides inside the groove, and the groove is provided with a power component for driving the connecting block to slide, and the inner surface of the bonding frame is provided with multiple bonding suction cups.

[0014] As a further improvement to this technical solution, the power assembly includes a longitudinal transmission screw that rotates inside the groove. The outer wall of the longitudinal transmission screw is threadedly connected to the surface of the connecting block, and the end of the longitudinal transmission screw is connected to the output shaft of a drive motor.

[0015] As a further improvement to this technical solution, the support and blocking mechanism includes at least a rotating fork protruding on the front side of the placement platform, a rotating rod movably connected to the end of the rotating fork, and a telescopic support assembly connected to the end of the rotating rod. The telescopic support assembly is used to be vertically positioned at the front edge of the placement platform along with the rotating rod.

[0016] As a further improvement to this technical solution, the bottom of the rotating fork is provided with a threaded insert rod, the end of which is threaded through the edge of the placement platform, and the lower end of the threaded insert rod is "sharp".

[0017] As a further improvement to this technical solution, the telescopic support assembly includes an outer shell fixed to the end of the rotating rod. Movable rods are slidably provided in the inner cavities at both ends of the outer shell. The movable rods are "L"-shaped, and one end extends out of the inner shell and is fixedly connected to a pad.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. In the electrical equipment handling device used in this construction project, the orientation control component drives the clamping component to extend to the outside of the placement platform and moves the clamping component downward, so that the electrical equipment to be handled is located between the two clamping components. Under the drive of the convergence drive component, the two clamping components converge and clamp the electrical equipment. Then, the orientation control component again drives the electrical equipment to move with the clamping components to the top of the placement platform, assisting the electrical equipment to be placed on the placement platform. This facilitates subsequent transfer with the placement platform, saves time and effort, and makes it convenient to handle the electrical equipment.

[0020] 2. In the electrical equipment handling device used in this construction project, after the electrical equipment is placed on the top of the placement platform, the fitting clamping component acts as a clamping and limiting mechanism and moves on the placement platform to clamp and limit the electrical equipment during the transfer process. At the same time, the supporting blocking mechanism blocks the front side of the placement platform to limit the electrical equipment again, thereby improving the safety during the transfer process.

[0021] Furthermore, when electrical equipment is not required to be clamped, the orientation control component can drive the clamping component to fold on top of the placement platform, saving space.

[0022] 3. In the electrical equipment handling device used in this construction project, the orientation control component can not only change the position and height of the clamping component to adapt to the position of the electrical equipment for lifting, but also switch the horizontal and vertical states of the clamping component. In the horizontal state, it can clamp thicker electrical equipment, and in the vertical state, it can clamp taller electrical equipment, thus increasing the clamping range.

[0023] 4. In the electrical equipment handling device used in this construction project, the sliding of the end of the movable rod inside the outer casing changes the distance between the two movable rods, which helps to adapt to the width of the electrical equipment, change the limit range, and improve the applicability.

[0024] Meanwhile, by setting a pad, when the bonding frame clamps the electrical equipment, the pad can be positioned directly below the bonding frame, which can support the bonding frame and improve the stability of the bonding frame in maintaining a horizontal clamping state. In addition, when the movable rod tilts to guide the electrical equipment, the pad can contact the ground or platform to increase frictional resistance and improve the stability of tilting. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention when lifted.

[0026] Figure 2 This is one of the overall structural limiting diagrams of the present invention;

[0027] Figure 3 This is a second schematic diagram of the overall structural limiting of the present invention;

[0028] Figure 4 This is an assembly diagram of the placement platform and the supporting blocking mechanism of the present invention;

[0029] Figure 5 This is a schematic diagram of the auxiliary handling mechanism of the present invention;

[0030] Figure 6 This is a schematic diagram of the fitting and clamping assembly of the present invention;

[0031] Figure 7 This is a schematic diagram of the support and blocking mechanism of the present invention;

[0032] Figure 8 For the present invention Figure 4 A schematic diagram of the structure at point A.

[0033] The meanings of the labels in the diagram are as follows:

[0034] 100. Place the work surface;

[0035] 110. Drive slot; 120. Caster wheel; 130. Push rod;

[0036] 200. Auxiliary handling mechanism;

[0037] 210. Converging drive assembly; 211. Clamping plate; 212. Lateral transmission screw;

[0038] 220. Orientation control component; 221. Movable plate; 222. Movable motor; 223. Connecting block;

[0039] 230. Adhesion clamping assembly; 231. Adhesion frame; 232. Adhesion suction cup; 233. Longitudinal transmission screw; 2330. Drive motor;

[0040] 300. Support and blocking mechanism;

[0041] 310. Rotary fork; 311. Rotary lever;

[0042] 320. Telescopic support assembly; 321. Outer shell; 322. Movable rod; 323. Pad;

[0043] 330. Threaded insert rod. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1

[0046] Please see Figures 1-8 As shown, this embodiment provides an electrical equipment handling device for construction engineering, including a placement platform 100. A drive groove 110 is formed at the top of the placement platform 100. An auxiliary handling mechanism 200 is provided inside the drive groove 110. The auxiliary handling mechanism 200 includes a convergence drive assembly 210 that slides within the drive groove 110. Two symmetrical orientation adjustment components 220 are provided at the top of the convergence drive assembly 210. A clamping assembly 230 is provided at the end of each orientation adjustment component 220. As the orientation adjustment components 220 extend outwards, and the convergence drive assembly 210 drives the two clamping assemblies 230 to converge and clamp the outer wall of the electrical equipment, the orientation adjustment components 220 raise the clamping assemblies 230 to directly above the placement platform 100. Wherein:

[0047] A support blocking mechanism 300 is provided at the edge of the placement platform 100. The support blocking mechanism 300 is used to keep the placement platform 100 firmly supported when the clamping assembly 230 is raised, and to limit the movement when the auxiliary electrical equipment is moved.

[0048] like Figure 1-3 As shown, the present invention takes into account that the current handling device's placement platform is a certain distance from the ground, which requires lifting the electrical equipment onto the placement platform before it can be moved with the handling device, which is time-consuming and labor-intensive. If other lifting devices are used, the construction cost will increase. Therefore, the orientation control component 220 drives the fitting clamping component 230 to extend to the outside of the placement platform 100 and drives the fitting clamping component 230 to move downward, so that the electrical equipment to be moved is located between the two fitting clamping components 230. Under the drive of the convergence drive component 210, the two fitting clamping components 230 converge and clamp the electrical equipment. Then, the orientation control component 220 again drives the electrical equipment to move with the fitting clamping component 230 to directly above the placement platform 100, assisting the electrical equipment to be placed on the placement platform 100, which is conducive to subsequent transfer with the placement platform 100, saving time and labor, and making it convenient to move the electrical equipment.

[0049] When electrical equipment is placed on the placement platform, it is easily subject to bumps and vibrations during the transfer process as it is moved by the pushing and transporting device. If the electrical equipment is not limited and fixed, it may shake and fall, affecting safety. Therefore, after the electrical equipment is placed on the top of the placement platform 100, the fitting clamping component 230 acts as a clamping and limiting mechanism and moves on the placement platform 100 to clamp and limit the electrical equipment during the transfer process. At the same time, the support blocking mechanism 300 blocks the front side of the placement platform 100 to limit the electrical equipment again, thereby improving the safety during the transfer process.

[0050] Furthermore, when it is not necessary to clamp electrical equipment, the orientation adjustment component 220 can drive the clamping component 230 to fold on top of the placement platform 100, saving space.

[0051] When clamping or limiting electrical equipment, existing technologies are not convenient for adjusting the clamping range according to the size of the electrical equipment, which affects the range of auxiliary handling. Therefore, the orientation adjustment component 220 can not only change the position and height of the clamping component 230 to adapt to the position of the electrical equipment for lifting, but also switch the horizontal and vertical states of the clamping component 230. In the horizontal state, thicker electrical equipment can be clamped, and in the vertical state, taller electrical equipment can be clamped, thus improving the clamping range of use.

[0052] Based on the above, the specific structure needs to be disclosed in detail:

[0053] Firstly, placing electrical equipment on the placement platform 100 facilitates easier movement of the equipment from one location to another, improving handling efficiency. Figure 4 As shown, casters 120 are provided at the four corners of the bottom of the placement platform 100, and push rods 130 are provided at the edge of the placement platform 100 away from the support and blocking mechanism 300. Workers can hold the push rods 130 and push, and the casters 120 roll on the ground, so that the placement platform 100 can be moved, thereby facilitating the transfer of electrical equipment used in construction projects and ensuring structural integrity.

[0054] Then, to ensure that the convergence drive component 210 can drive the orientation control component 220 and the clamping component 230 to converge inward, thus achieving stability in clamping the electrical equipment, please refer to [link to relevant documentation]. Figure 5 As shown, the structure of the convergence drive assembly 210 needs to be further disclosed, such that the convergence drive assembly 210 includes at least two symmetrical transverse transmission screws 212 rotating inside the drive groove 110. The outer threads of the two transverse transmission screws 212 are arranged opposite each other and are connected end to end. One end of one of the transverse transmission screws 212 is connected to a motor output shaft.

[0055] Two symmetrical clamping plates 211 are slidably arranged inside the drive groove 110. The lower ends of the clamping plates 211 are respectively threadedly connected to the outer wall of the transverse transmission screw 212. In addition, the motor housing is embedded inside the drive groove 110. The output shaft of the motor drives the two transverse transmission screws 212 to rotate coaxially, so that the lower ends of the clamping plates 211 move relative to each other along the threads on the outer wall of the two transverse transmission screws 212, thereby realizing the convergence and diffusion between the two clamping plates 211.

[0056] It is worth noting that, in order to achieve the orientation adjustment component 220, the fitting and clamping component 230 can be driven to change the clamping position and height. Please refer to [link / reference needed]. Figure 5 As shown, the structure of the orientation control component 220 is further disclosed, such that the orientation control component 220 includes at least a movable plate 221 that rotates at the end of the clamping plate 211. The shaft of the movable plate 221 is connected to the output shaft of the movable motor 222. The housing of the movable motor 222 is fixed to the surface of the clamping plate 211, and a connecting block 223 is rotatably provided at the end of the movable plate 221 away from the movable motor 222. When the movable motor 222 is powered on, it is made to work. The output shaft of the movable motor 222 drives the movable plate 221 to rotate, thereby causing the connecting block 223 at the end of the movable plate 221 to change its height and position, thereby realizing the change of height and position of the clamping component 230.

[0057] Specifically, for further disclosure of the fitting and clamping component 230, please refer to [link to relevant documentation]. Figure 6 As shown, the bonding clamping assembly 230 includes at least a bonding frame 231. The outer surface of the bonding frame 231 has a groove, the connecting block 223 slides inside the groove, and the groove is provided with a power component for driving the connecting block 223 to slide. The inner surface of the bonding frame 231 is provided with a plurality of bonding suction cups 232.

[0058] When changing the clamping position and height, the movable plate 221 rotates, causing the bonding frame 231 to rotate to the front of the placement platform 100, thus disengaging the bonding frame 231 from directly above the placement platform 100. Simultaneously, the connecting block 223 slides within the groove, further disengaging the bonding frame 231 from the placement platform 100. This ensures more accurate positioning of the electrical equipment between the two bonding frames 231. Furthermore, the rotation of the movable plate 221 changes the height of the bonding frame 231 to accommodate the height of the electrical equipment. Then, as the clamping plate 211 moves inward, it pulls the two opposing bonding frames 231 inward until they engage with the suction cup 232. The force is pressed against the surface of the electrical equipment, squeezing out the air inside the suction cup 232, so that the suction cup 232 adheres to the outer wall of the electrical equipment, improving the fixing effect; finally, the movable plate 221 is rotated in the opposite direction again, driving the bonding frame 231 to rotate above the placement platform 100, so that the bottom of the electrical equipment is flush with the placement platform 100, and the rotation of the movable plate 221 is stopped. If the electrical equipment is not completely above the placement platform 100, the power component needs to drive the connecting block 223 to slide inside the groove, which in turn drives the bonding frame 231 to move into the inner cavity of the placement platform 100 until the electrical equipment is supported on the top of the placement platform 100, completing the lifting task;

[0059] As the electrical equipment supported by the placement platform 100 is transferred, the bonding frame 231 can be kept in an inwardly gathered state, continuously clamping and limiting the electrical equipment, thereby improving the stability during the transfer process.

[0060] Meanwhile, when clamping tall electrical equipment, if the clamping frame 231 can only contact a short area of ​​the electrical equipment, the clamping stability will be poor. Therefore, since the connecting block 223 is movably connected to the end of the movable plate 221, the position of the clamping frame 231 can be rotated so that the connecting block 223 rotates to the end of the movable plate 221, and the clamping frame 231 switches to a vertical state. This is beneficial for clamping tall electrical equipment, increasing the clamping range and improving the clamping stability.

[0061] Furthermore, to achieve more stable and convenient sliding of the connecting block 223 within the groove, which is beneficial for changing the position of electrical equipment, it is necessary to further disclose the power component. The power component includes a longitudinal transmission screw 233 that rotates inside the groove. The outer wall of the longitudinal transmission screw 233 is threadedly connected to the surface of the connecting block 223, and the end of the longitudinal transmission screw 233 is connected to the output shaft of the drive motor 2330. When the drive motor 2330 is powered on, it will rotate, and the output shaft of the drive motor 2330 will drive the longitudinal transmission screw 233 to rotate, causing the connecting block 223 to slide along the outer wall of the longitudinal transmission screw 233. This makes the position change between the orientation control component 220 and the clamping component 230 more stable.

[0062] Example 2:

[0063] To achieve the desired effect, the support and blocking mechanism 300 can limit the front of the electrical equipment when it is placed on top of the placement platform 100, preventing it from sliding horizontally during transfer. Furthermore, it can stabilize the placement platform 100 when the electrical equipment is raised to the top. (See [link to relevant documentation]). Figures 7-8 Further disclosure is needed regarding the structure of the support and blocking mechanism 300, which includes at least a rotating fork 310 protruding from the front side of the placement platform 100. A rotating rod 311 is movably connected to the end of the rotating fork 310, and a telescopic support assembly 320 is connected to the end of the rotating rod 311. The telescopic support assembly 320 is used to rotate vertically with the rotating rod 311 at the front edge of the placement platform 100, so that the rotating rod 311 can rotate inside the rotating fork 310. When the telescopic support assembly 320 is rotated to a vertical position, it can block the front edge of the placement platform 100 to prevent electrical equipment from slipping.

[0064] It can also drive the telescopic support assembly 320 to rotate to tilt outward, forming an inclined support structure, so that the electrical equipment can slide along the telescopic support assembly 320 to the top of the electrical equipment, avoiding the placement platform 100 being too high off the ground, which would be difficult to move the electrical equipment. When moving the equipment manually, it can slide along the telescopic support assembly 320 to the top of the placement platform 100, saving labor intensity.

[0065] Then, when lifting electrical equipment, the front end of the placement platform 100 is subjected to a large downward force, which may cause the placement platform 100 to tip over. Therefore, a threaded rod 330 is provided at the bottom of the rotating fork 310. The threaded rod 330 has a thread that passes through the edge of the placement platform 100, and the lower end of the threaded rod 330 is "sharp". By turning the rotating fork 310, the threaded rod 330 can be moved up and down along the surface of the placement platform 100, and can be inserted into the ground for fixation, thereby improving the fixation strength of the placement platform 100.

[0066] Specifically, the telescopic support assembly 320 includes an outer shell 321 fixed to the end of the rotating rod 311. Movable rods 322 are slidably provided in the inner cavities at both ends of the outer shell 321. The movable rods 322 are L-shaped, and one end extends out of the inner shell 321 and is fixedly connected to a pad 323. By sliding the end of the movable rod 322 inside the outer shell 321, the distance between the two movable rods 322 can be changed, which is beneficial to adapt to the width of electrical equipment, change the limit range, and improve the applicability.

[0067] Meanwhile, by setting the pad 323, when the bonding frame 231 clamps the electrical equipment, the pad 323 is located directly below the bonding frame 231, which can support the bonding frame 231 and improve the stability of the bonding frame 231 in maintaining a horizontal clamping state. In addition, when the movable rod 322 tilts to guide the electrical equipment, the pad 323 can contact the ground or platform to increase the frictional resistance and improve the stability of the tilt.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrical equipment handling device for construction engineering, comprising a placement platform (100), characterized in that: The top of the placement platform (100) is provided with a drive groove (110), and an auxiliary handling mechanism (200) is provided inside the drive groove (110). The auxiliary handling mechanism (200) includes a gathering drive component (210) that slides in the drive groove (110). The top of the gathering drive component (210) is provided with two symmetrical orientation control components (220). The end of the orientation control component (220) is provided with a fitting clamping component (230). The orientation control component (220) extends outward. At the same time, the gathering drive component (210) drives the two fitting clamping components (230) to gather and clamp the outer wall of the electrical equipment. After the orientation control component (220) drives the fitting clamping component (230) to be raised to directly above the placement platform (100), wherein: The placement platform (100) is provided with a support blocking mechanism (300) at its edge. The support blocking mechanism (300) is used to keep the placement platform (100) firmly supported when the clamping assembly (230) is raised, and to limit the movement of auxiliary electrical equipment. The convergence drive assembly (210) includes at least two symmetrical transverse transmission screws (212) that rotate within the drive groove (110). The outer threads of the two transverse transmission screws (212) are arranged opposite each other and connected end to end. One end of one of the transverse transmission screws (212) is connected to a motor output shaft. The drive groove (110) is equipped with two symmetrical clamping plates (211), and the lower ends of the clamping plates (211) are respectively threaded to the outer wall of the transverse transmission screw (212). The orientation control component (220) includes at least a movable plate (221) that rotates at the end of the clamping plate (211). The output shaft of a movable motor (222) is connected to the pivot of the movable plate (221). The housing of the movable motor (222) is fixed to the surface of the clamping plate (211), and a connecting block (223) is rotatably provided at the end of the movable plate (221) away from the movable motor (222). The bonding clamping assembly (230) includes at least a bonding frame (231). The outer surface of the bonding frame (231) is provided with a groove. The connecting block (223) slides inside the groove. The groove is provided with a power component for driving the connecting block (223) to slide. The inner surface of the bonding frame (231) is provided with a plurality of bonding suction cups (232).

2. The electrical equipment handling device for construction engineering according to claim 1, characterized in that: The placement platform (100) is provided with casters (120) at the four corners of its bottom, and push rods (130) are provided at the edge of the placement platform (100) away from the support and blocking mechanism (300).

3. The electrical equipment handling device for construction engineering according to claim 2, characterized in that: The power assembly includes a longitudinal transmission screw (233) that rotates inside the groove. The outer wall of the longitudinal transmission screw (233) is threadedly connected to the surface of the connecting block (223), and the end of the longitudinal transmission screw (233) is connected to the output shaft of a drive motor (2330).

4. The electrical equipment handling device for construction engineering according to claim 3, characterized in that: The support and blocking mechanism (300) includes at least a rotating fork (310) protruding on the front side of the placement platform (100). A rotating rod (311) is movably connected to the end of the rotating fork (310). A telescopic support assembly (320) is connected to the end of the rotating rod (311). The telescopic support assembly (320) is used to be vertically positioned at the front edge of the placement platform (100) along with the rotating rod (311).

5. The electrical equipment handling device for construction engineering according to claim 4, characterized in that: The bottom of the rotating fork (310) is provided with a threaded rod (330), the end of which is threaded through the edge of the placement platform (100), and the lower end of the threaded rod (330) is "sharp".

6. The electrical equipment handling device for construction engineering according to claim 5, characterized in that: The telescopic support assembly (320) includes an outer shell (321) fixed to the end of the rotating rod (311). Movable rods (322) are slidably provided in the inner cavities at both ends of the outer shell (321). The movable rods (322) are "L" shaped, and one end extends out of the inner cavity of the outer shell (321) and is fixedly connected to a pad (323).

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