Mounting device for fixing fire-fighting pipeline in fire-fighting engineering

Abstract

The invention discloses a mounting device for fixing a fire-fighting pipeline in fire-fighting engineering, which belongs to the field of fire-fighting engineering, and comprises a base and a top seat, the base comprises a mounting hole convenient for mounting, and two adjusting parts for controlling the lifting of the top seat are arranged between the base and the top seat. The two adjusting parts are installed at the two ends of the base correspondingly and connected with the two ends of the top seat, the base and the top seat are matched to form an installation space, a plurality of installation parts used for fixing a fire fighting pipeline are arranged in the installation space, the installation parts are all connected to the top seat, and the installation parts are matched with the base. The fixing device has the beneficial effects that multiple firefighting pipelines can be fixed according to actual requirements, only one-time installation operation is needed, installation is convenient and fast, operation is easy, the installation efficiency is high, the fixing requirements can be met when the firefighting pipelines with different diameters exist when the multiple firefighting pipelines are fixed, practicability is high, and the practicability is high. And the pressing plate is matched with the extension to improve the pipeline mounting stability.

Description

Technical Field

[0001] The invention relates to the field of fire protection engineering, and more particularly to an installation device for fixing fire protection pipelines in fire protection engineering. Background Art

[0002] Fire protection engineering is an important part of construction engineering. Its main purpose is to prevent fires, reduce fire losses, and ensure timely and effective fire extinguishing and rescue when a fire occurs. Fire protection engineering includes fire alarm systems, fire extinguishing systems, fire smoke exhaust and ventilation systems, fire electrical systems and other aspects. Fire protection pipes are an important part of fire protection engineering. They are used to connect fire protection equipment and equipment, and to transport water, gas or other media for fire extinguishing. In order to ensure that fire protection pipes can stably and reliably transport fire extinguishing media when a fire occurs, strict requirements are placed on the pressure resistance, corrosion resistance, high temperature resistance and other properties of fire protection pipes. During the fire protection construction process, the layout and installation quality of fire protection pipes directly affect the overall performance and effect of the fire protection engineering.

[0003] The invention patent with application number 202110610252.6 discloses a pipe installation device for fire protection engineering construction. The installation structure is divided into three parts: a pipe buckling mechanism, a connecting adjustment mechanism and a supporting fixing structure. The pipe buckling mechanism fixes the pipe by a buckling chain. The length of the buckling chain and the position of its two ends can be adjusted to fix pipes of different diameters. The fixed installation is more flexible and convenient. The fixed support plate of the supporting fixing structure can be fixed on the wall alone. The fixed slide groove provided by the connecting adjustment mechanism cooperates with the fixed slider. The connecting pipe buckling mechanism and the pipe buckling mechanism can be quickly installed by horizontal sliding, which makes the installation and fixing more convenient and quick.

[0004] According to the above technical solution, although it is more convenient and quick to install and fix the pipeline, there are the following problems: 1. The length of the snap-on chain is adjusted to match the pipe by disassembling the snap-on chain. The operation of disassembling the snap-on chain is troublesome. When fixing pipes of different diameters, it takes a lot of time to disassemble the snap-on chains of different lengths to match them with pipes of different diameters, which slows down the installation progress.

[0005] 2. One installation device has only one installation position, so it can only install one pipe. During the actual installation process, if multiple pipes need to be installed at the same position, multiple installation devices need to be used and the installation operation needs to be repeated multiple times. The installation needs to be adjusted, which has low efficiency and low practicality.

[0006] 3. The pipeline is fixed by a single buckle chain, and the stability of the pipeline installation is not ideal. Summary of the invention

[0007] In view of the deficiencies in the prior art, an object of the present invention is to provide an installation device for fixing fire protection pipes in fire protection engineering.

[0008] To achieve the above object, the present invention provides the following technical solutions: A mounting device for fixing a fire protection pipe in a fire protection project comprises a base and a top seat, the base comprises a mounting hole for facilitating installation, two adjusting parts for controlling the lifting and lowering of the top seat are arranged between the base and the top seat, the two adjusting parts are respectively installed at two ends of the base and connected to two ends of the top seat, the base and the top seat cooperate to form an installation space, a mounting part for fixing the fire protection pipe is arranged in the installation space, a plurality of mounting parts are arranged, and the plurality of mounting parts are all connected to the top seat, and the mounting part cooperates with the base.

[0009] The present invention is further configured such that the mounting part includes a pressing plate and a positioning rod, one end of the positioning rod is mounted on the upper surface of the pressing plate, the other end of the positioning rod is connected to the top seat, and a plurality of first elastic pads corresponding to the plurality of mounting parts are mounted on the base, the first elastic pads correspond to the lower surface of the pressing plate, and the pressing plate cooperates with the base.

[0010] The present invention is further configured as follows: the mounting part also includes a limiting rod and an extension plate, a hinge and a magnet block are installed on the extension plate, one end of the extension plate is movably connected to the pressing plate through the hinge, a metal block magnetically connected to the magnet block is installed on the pressing plate, a support part cooperating with the top seat is movably connected to the extension plate, a bearing is installed at one end of the positioning rod, one end of the positioning rod is rotatably connected to the upper surface of the pressing plate through the bearing, a second elastic pad corresponding to the first elastic pad is installed on the lower surface of the pressing plate and the surface of the extension plate, a positioning screw hole threadedly connected to the other end of the positioning rod and a first limiting hole movably connected to the limiting rod are opened on the top seat, a second limiting hole corresponding to the first limiting hole is opened on the pressing plate, and the limiting rod is plugged into the second limiting hole.

[0011] The present invention is further configured as follows: a transmission shaft is provided between the two adjusting parts, the adjusting part includes a transmission gear, a guide rod, a guide plate, a fixed plate and a first spring, one end of the guide plate is connected to the top seat, the bottom of the fixed plate is installed on the base, and a movable chamber movably connected to the other end of the guide plate is opened on the fixed plate, the guide rod and the first spring are both installed on the inner wall of the bottom of the movable chamber, and a guide groove movably connected to the guide rod is opened on the guide plate, the first spring is connected to the guide plate, a transmission gear bar is placed on one side of the guide plate, a rack movable in the movable chamber is installed on one side of the guide plate, and the transmission gear is rotatably connected to the fixed plate and meshes with the rack, and the two ends of the transmission shaft are respectively connected to the transmission gears of the two adjusting parts.

[0012] The present invention is further configured such that a placement groove is formed on the extension plate, and the support part includes a connecting tube movably connected to one end of the placement groove, a second spring installed in the connecting tube and in a compressed state, and a push rod connected to the second spring and movable in the connecting tube, the push rod abuts against the inner side wall of the other end of the placement groove, and the push rod cooperates with the top seat.

[0013] The present invention is further configured such that a mounting block rotatably connected to a transmission gear is mounted on the fixed plate, a transmission shaft is rotatably connected to a corresponding mounting block, and the transmission shaft is connected to a transmission gear on the corresponding mounting block.

[0014] The present invention is further configured such that the transmission shaft is provided with a gripping groove arranged around the transmission shaft, an anti-skid pad is installed in the gripping groove, and the anti-skid pad includes an anti-skid protrusion.

[0015] By adopting the above technical solution, the beneficial effects of the present invention are: 1. The distance between the top seat and the base is adjusted by the adjustment part to adjust the size of the installation space so as to adapt to fire pipes of different diameters, and the adjustment part moves the top seat closer to the base, and the mounting part on the top seat cooperates with the base to fix the fire pipe in the installation space. The installation is convenient and fast, the operation is simple, and the installation efficiency is high. According to actual needs, when there are fire pipes with different diameters among multiple fire pipes, the pressing plate is moved to fix the pipe by rotating the positioning rod corresponding to the fire pipe, so that when fixing multiple fire pipes, there are fire pipes with inconsistent diameters, and the fixing requirements can be met, thereby improving practicality.

[0016] 2. During the actual installation process, if multiple pipes need to be installed at the same position, the setting of several installation parts is convenient for fixing multiple fire-fighting pipes, and as the top seat moves, the pressing plate of the installation part moves at the same time to fix the multiple fire-fighting pipes. Only one installation operation is required, avoiding the need to use multiple installation devices and repeat multiple installation operations to fix multiple fire-fighting pipes, thereby improving installation efficiency and being highly practical.

[0017] 3. The pressing plate and the extension plate are pressed on the fire-fighting pipe and cooperate with the base to fix the fire-fighting pipe to improve the stability of the pipe installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the cooperation between the pressing plate and the extension plate.

[0020] Figure 3 It is a structural schematic diagram of the cooperation between the support part and the top seat.

[0021] Figure 4 It is a structural schematic diagram of the cooperation between the support part and the extension plate.

[0022] Figure 5 It is a structural schematic diagram of the cooperation between the guide plate and the movable chamber.

[0023] Figure 6 It is a schematic diagram of the structure of the anti-slip pad and the grip groove.

[0024] In the figure: base 1, top seat 2, mounting hole 101, adjustment part 3, mounting space 100, mounting part 4, pressing plate 5, positioning rod 6, first elastic pad 7, limiting rod 8, extension plate 9, hinge 10, magnet block 11, metal block 12, support part 13, second elastic pad 14, positioning screw hole 15, first limiting hole 16, second limiting hole 17, transmission shaft 18, transmission gear 19, guide rod 20, guide plate 21, fixing plate 22, first spring 23, movable chamber 220, guide groove 210, rack 24, placement groove 25, connecting pipe 26, second spring 27, top rod 28, mounting block 29, grip groove 30, anti-slip pad 31. DETAILED DESCRIPTION

[0025] Reference Figures 1 to 6 The embodiments of the present invention are further described.

[0026] A mounting device for fixing a fire protection pipe in a fire protection project comprises a base 1 and a top seat 2, the base 1 comprises a mounting hole 101 for easy installation, the base 1 is bolted to a wall or the ground through the mounting hole 101 to fix the base 1, two adjustment parts 3 for controlling the lifting of the top seat 2 are arranged between the base 1 and the top seat 2, the two adjustment parts 3 are respectively mounted at both ends of the base 1 and connected to both ends of the top seat 2, the base 1 and the top seat 2 cooperate to form an installation space 100, a mounting part 4 for fixing the fire protection pipe is arranged in the installation space 100, a plurality of mounting parts 4 are provided, and the plurality of mounting parts 4 are all connected to the top seat 2, the mounting part 4 comprises a pressing plate 5 and a positioning rod 6, one end of the positioning rod 6 is mounted on the upper surface of the pressing plate 5, the other end of the positioning rod 6 is connected to the top seat 2, and the pressing plate 5 cooperates with the base 1.

[0027] When in use, the fire-fighting pipe is placed in the installation space 100 between the base 1 and the top seat 2, and the distance between the top seat 2 and the base 1 is adjusted by the adjustment part 3, so as to adjust the size of the installation space 100 to accommodate fire-fighting pipes of different diameters. The top seat 2 is moved closer to the base 1 by adjusting the adjustment part 3, so that the pressing plate 5 of the mounting part 4 on the top seat 2 cooperates with the base 1 to fix the fire-fighting pipe in the installation space 100. The installation is convenient and quick, the operation is simple, and the installation efficiency is high. During the actual installation process, if multiple pipes need to be installed at the same position, the provision of several mounting parts 4 facilitates the fixation of multiple fire-fighting pipes.

[0028] The mounting portion 4 also includes a limiting rod 8 and an extension plate 9, on which a hinge 10 and a magnet block 11 are installed. One end of the extension plate 9 is movably connected to the pressing plate 5 through the hinge 10, and a metal block 12 magnetically connected to the magnet block 11 is installed on the pressing plate 5. When the fire-fighting pipe is not fixed, the extension plate 9 is folded by the hinge 10 to retract the extension plate 9, and the magnet block 11 is magnetically connected to the metal block 12 to keep the extension plate 9 stable when it is retracted.

[0029] A support portion 13 that cooperates with the top seat 2 is movably connected on the extension plate 9, a bearing is installed at one end of the positioning rod 6, and one end of the positioning rod 6 is rotatably connected to the upper surface of the pressing plate 5 through the bearing. A positioning screw hole 15 threadedly connected to the other end of the positioning rod 6 and a first limiting hole 16 movably connected to the limiting rod 8 are opened on the top seat 2, and a second limiting hole 17 corresponding to the first limiting hole 16 is opened on the pressing plate 5, and the limiting rod 8 is plugged into the second limiting hole 17.

[0030] When the pressing plate 5 is used to fix the fire-fighting pipe, the extension plate 9 is unfolded and cooperated with the pressing plate 5 to form a long plate, and the limiting rod 8 is pulled out from the second limiting hole 17 to facilitate the pressing plate 5 to rotate at one end of the positioning rod 6, so that the long plate is arranged along the length direction of the fire-fighting pipe, and the top seat 2 is moved toward the base 1 through the adjusting part 3, and the supporting part 13 is in conflict with the top seat 2, so that the top seat 2 moves toward the base 1 and drives the long plate to conflict with the fire-fighting pipe to fix the fire-fighting pipe. Compared with fixing the fire-fighting pipe by the pressing plate 5, the fixing area of ​​the fire-fighting pipe is increased by pressing and fixing the fire-fighting pipe by the long plate, and the fixing stability of the fire-fighting pipe is improved. The limiting rod 8 is inserted back into the second limiting hole 17 to prevent the positioning rod 6 from rotating and driving the pressing plate 5 to rotate, so that the long plate and the fire-fighting pipe are misaligned, and the contact area between the long plate and the fire-fighting pipe is reduced, which reduces the fixing effect.

[0031] According to actual needs, when there are fire-fighting pipes with different diameters among multiple fire-fighting pipes, the pressing plate 5 and the extension plate 9 are moved and fixed to the fire-fighting pipe by rotating the positioning rod 6 corresponding to the fire-fighting pipe, so that when fixing multiple fire-fighting pipes, fire-fighting pipes with inconsistent diameters can also meet the fixing requirements, thereby improving practicality.

[0032] The base 1 is provided with a plurality of first elastic pads 7 corresponding one to one with the plurality of mounting portions 4 . The first elastic pads 7 correspond to the lower surface of the pressing plate 5 . The lower surface of the pressing plate 5 and the surface of the extension plate 9 are both provided with second elastic pads 14 corresponding to the first elastic pads 7 .

[0033] When the long plate formed by the pressing plate 5 and the extension plate 9 is used to fix the fire pipe, if the fire pipe is a circular fire pipe with an arc-shaped surface, the first elastic pad 7 and the second elastic pad 14 are in contact with the surface of the circular fire pipe. As the long plate moves toward the base 1 to press and fix the fire pipe, the first elastic pad 7 and the second elastic pad 14 are squeezed and deformed to fit the surface of the circular fire pipe, which is beneficial to fix the circular fire pipe stably. For the square fire pipe, it is directly placed in the installation space 100 and fixed by the long plate and the base 1, so that the installation device can fix both circular fire pipes and square fire pipes, further enhancing practicality.

[0034] When the diameter of the square fire-fighting pipe is large, the limiting rod 8 is pulled out from the second limiting hole 17 to facilitate the rotation of the pressing plate 5 so that the long plate formed by the pressing plate 5 and the extension plate 9 is arranged along the length direction of the base 1, so that the long plate is arranged horizontally, and the limiting rod 8 is inserted back into the second limiting hole 17, and the positioning rod 6 is rotated to move the long plate toward the base 1, so that the long plate can be used to fix the square fire-fighting pipe with a larger diameter horizontally, so that different fixing methods can be provided according to needs, thereby enhancing the flexibility of fixing the fire-fighting pipe.

[0035] A transmission shaft 18 is provided between the two adjustment parts 3. The adjustment part 3 includes a transmission gear 19, a guide rod 20, a guide plate 21, a fixed plate 22 and a first spring 23. One end of the guide plate 21 is connected to the top seat 2, and the bottom of the fixed plate 22 is installed on the base 1, and the fixed plate 22 is provided with an active chamber movably connected to the other end of the guide plate 21. The guide rod 20 and the first spring 23 are both installed on the inner wall of the bottom of the active chamber, and the guide plate 21 is provided with a guide groove movably connected to the guide rod 20. The first spring 23 is connected to the guide plate 21. The transmission gear 19 is placed on one side of the guide plate 21, and a rack 24 that moves in the active chamber is installed on one side of the guide plate 21. The transmission gear 19 is rotatably connected to the fixed plate 22 and meshes with the rack 24. The two ends of the transmission shaft 18 are respectively connected to the transmission gears 19 of the two adjustment parts 3.

[0036] The installer rotates the transmission shaft 18 to make the transmission gears 19 of the two adjustment parts 3 rotate synchronously and drive the rack 24 on the corresponding guide plate 21 to move, so that the guide plates 21 of the two adjustment parts 3 move toward the bottom of the active chamber in the active chamber of the corresponding fixed plate 22, and cooperate with the guide plate 21 to connect with the top seat 2 to move the top seat 2 and the mounting part 4 thereon toward the base 1, and then move the pressing plate 5 and the extension plate 9 toward the base 1, so that the fire-fighting pipe is fixed in the installation space 100 by adjusting the adjustment part 3 to make the top seat 2 close to the base 1 so that the long plate formed by the pressing plate 5 and the extension plate 9 is fixed. The setting of the first spring 23 provides support force for the guide plate 21, so that when the transmission gear 19 rotates, it can mesh with the rack 24 to make the guide plate 21 smoother in the active chamber, and the guide rod 20 moves in the guide groove to prevent the guide plate 21 from deflecting when it moves.

[0037] As the top seat 2 moves, the pressing plates 5 of several mounting parts 4 on the top seat 2 are simultaneously moved to interfere with the corresponding fire-fighting pipes to fix multiple fire-fighting pipes in the installation space 100. Only one installation operation is required, avoiding the need to use multiple installation devices and repeat multiple installation operations to fix multiple fire-fighting pipes, thereby improving installation efficiency and being highly practical.

[0038] A placement groove 25 is opened on the extension plate 9, and the support part 13 includes a connecting tube 26 movably connected to one end of the placement groove 25, a second spring 27 installed in the connecting tube 26 and in a compressed state, and a push rod 28 connected to the second spring 27 and movable in the connecting tube 26, the push rod 28 abuts against the inner side wall of the other end of the placement groove 25, and the push rod 28 cooperates with the top seat 2.

[0039] When the extension plate 9 is unfolded to fix the fire-fighting pipe, the connecting pipe 26 and the top rod 28 are rotated out of the placement groove 25 to make the connecting rod perpendicular to the extension plate 9. At this time, the top rod 28 is in conflict with the top seat 2 under the action of the second spring 27, so that when the top seat 2 moves toward the base 1, the top seat 2 presses the pressing plate 5 through the support part 13 to facilitate the fixation of the extension plate 9 to the fire-fighting pipe, thereby increasing the fixing stability of the long plate to the fire-fighting pipe. When the positioning rod 6 is rotated to make the pressing plate 5 move toward the base 1 to fix the fire-fighting pipe, the second spring 27 is in a compressed state to keep the top plate in conflict with the top seat 2 at all times, which will not affect the fixation of the extension plate 9 to the fire-fighting pipe.

[0040] A mounting block 29 rotatably connected to the transmission gear 19 is installed on the fixed plate 22, and a bearing is passed through the mounting block 29, and both ends of the bearing correspond to the transmission gear 19 and the transmission shaft 18 respectively. The gear shaft of the transmission gear 19 is rotatably connected to the mounting block 29 through the bearing, so as to realize the rotational connection of the transmission gear 19 on the fixed plate 22, and the transmission shaft 18 is rotatably connected to the corresponding mounting block 29 through the bearing, and the transmission shaft 18 is connected to the gear shaft of the corresponding transmission gear 19, so as to realize the synchronous rotation of the transmission gears 19 of the two adjustment parts 3 by rotating the transmission shaft 18, thereby realizing the movement of the top seat 2.

[0041] The drive shaft 18 is provided with a grip groove 30 which is arranged around the drive shaft 18, so that the installer can apply force to the drive shaft 18 and rotate the drive shaft 18. An anti-skid pad 31 is installed in the grip groove 30, and the anti-skid pad 31 includes anti-skid protrusions, which increases the friction between the installer's palm and the grip groove 30, and is conducive to the installer to better apply force to the drive shaft 18 and rotate the drive shaft 18.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A mounting device for fixing a fire protection pipe in a fire protection project, comprising a base (1) and a top seat (2), wherein the base (1) comprises a mounting hole (101) for facilitating installation, and wherein: Two adjusting parts (3) for controlling the lifting of the top seat (2) are provided between the base (1) and the top seat (2); the two adjusting parts (3) are respectively mounted at two ends of the base (1) and connected to two ends of the top seat (2); the base (1) and the top seat (2) cooperate to form an installation space (100); a mounting part (4) for fixing a fire-fighting pipe is provided in the installation space (100); a plurality of mounting parts (4) are provided, and the plurality of mounting parts (4) are all connected to the top seat (2); and the mounting parts (4) cooperate with the base (1).

2. The installation device for fixing fire protection pipes in fire protection engineering according to claim 1, characterized in that: The mounting portion (4) comprises a pressing plate (5) and a positioning rod (6), one end of the positioning rod (6) is mounted on the upper surface of the pressing plate (5), and the other end of the positioning rod (6) is connected to the top seat (2). A plurality of first elastic pads (7) corresponding to the plurality of mounting portions (4) are mounted on the base (1), the first elastic pads (7) correspond to the lower surface of the pressing plate (5), and the pressing plate (5) cooperates with the base (1).

3. The installation device for fixing fire protection pipes in fire protection engineering according to claim 2, characterized in that: The mounting portion (4) further comprises a limiting rod (8) and an extension plate (9), a hinge (10) and a magnet block (11) being mounted on the extension plate (9), one end of the extension plate (9) being movably connected to the pressing plate (5) via the hinge (10), a metal block (12) being magnetically connected to the magnet block (11) being mounted on the pressing plate (5), a supporting portion (13) being movably connected to the extension plate (9) and cooperating with the top seat (2), a bearing being mounted on one end of the positioning rod (6), and one end of the positioning rod (6) being rotatable via the bearing. The top seat (2) is provided with a positioning screw hole (15) threadedly connected to the other end of the positioning rod (6) and a first limiting hole (16) movably connected to the limiting rod (8); the pressing plate (5) is provided with a second limiting hole (17) corresponding to the first limiting hole (16); and the limiting rod (8) is plugged into the second limiting hole (17).

4. The installation device for fixing fire protection pipes in fire protection engineering according to claim 3, characterized in that: A transmission shaft (18) is provided between the two adjustment parts (3). The adjustment part (3) comprises a transmission gear (19), a guide rod (20), a guide plate (21), a fixing plate (22) and a first spring (23). One end of the guide plate (21) is connected to the top seat (2). The bottom of the fixing plate (22) is mounted on the base (1). The fixing plate (22) is provided with an active chamber movably connected to the other end of the guide plate (21). The guide rod (20) and the first spring (23) are both mounted on the bottom of the active chamber. The guide plate (21) is provided on the inner wall of the adjusting part, and a guide groove movably connected to the guide rod (20) is formed on the guide plate (21). The first spring (23) is connected to the guide plate (21). A transmission gear (19) is arranged on one side of the guide plate (21). A rack (24) movable in the movable chamber is installed on one side of the guide plate (21). The transmission gear (19) is rotatably connected to the fixed plate (22) and meshes with the rack (24). Both ends of the transmission shaft (18) are respectively connected to the transmission gears (19) of the two adjusting parts (3).

5. The installation device for fixing fire protection pipes in fire protection engineering according to claim 4, characterized in that: The extension plate (9) is provided with a placement groove (25), and the support portion (13) comprises a connecting tube (26) movably connected to one end of the placement groove (25), a second spring (27) installed in the connecting tube (26) and in a compressed state, and a push rod (28) connected to the second spring (27) and movable in the connecting tube (26), the push rod (28) abutting against the inner side wall of the other end of the placement groove (25), and the push rod (28) cooperates with the top seat (2).

6. The installation device for fixing fire protection pipes in fire protection engineering according to claim 5, characterized in that: A mounting block (29) rotatably connected to the transmission gear (19) is mounted on the fixing plate (22); the transmission shaft (18) is rotatably connected to the corresponding mounting block (29); and the transmission shaft (18) is connected to the transmission gear (19) on the corresponding mounting block (29).

7. The installation device for fixing fire protection pipes in fire protection engineering according to claim 6, characterized in that: The transmission shaft (18) is provided with a grip groove (30) arranged around the transmission shaft (18), an anti-skid pad (31) is installed in the grip groove (30), and the anti-skid pad (31) includes an anti-skid protrusion.

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