Fire hose reel convenient to assemble

Abstract

The utility model belongs to the technical field of fire-fighting equipment, and particularly relates to a fire-fighting hose reel convenient to assemble, which comprises a reel body, a limiting component, a hollow mounting circular truncated cone and a hanging arm, and further comprises a locking mechanism and a driving mechanism, the limiting assembly comprises a fixed limiting disc and a detachable limiting disc. The reel body is mounted at one end of the hollow mounting circular truncated cone through a locking mechanism, and the locking mechanism comprises a locking block and an L-shaped locking rod; the driving mechanism is used for driving the plurality of L-shaped locking rods to synchronously move towards each other or away from each other; a plurality of groups of L-shaped locking rods are synchronously driven by a built-in driving mechanism, so that the reel body and the hollow mounting circular truncated cone are quickly locked or unlocked, meanwhile, automatic coaxial centering can be realized, and the mounting precision is improved; and by matching with a manual bolt quick-assembly structure of the detachable limiting disc, the whole machine can be assembled and disassembled without a special tool, so that the assembling and disassembling time is greatly shortened, and meanwhile, the problems of neglected assembly and wrong assembly of parts are avoided.

Description

Technical Field

[0001] This utility model belongs to the field of fire-fighting equipment technology, specifically relating to a fire hose reel that is easy to assemble. Background Technology

[0002] Fire hose reels are common fire-fighting equipment, usually installed on walls or columns inside buildings. They consist of a reel bracket, a drum that is rotatably mounted on the bracket, a fire hose wound on the drum, and a valve connector connected to the hose. In the event of a fire, the hose can be quickly pulled out and the valve opened to extinguish the fire.

[0003] For existing fire hose reels, the assembly of the shaft, fixed bracket, and reel body mostly adopts the structure of locking nuts at both ends after passing through the shaft. Multiple parts such as bearings, washers, and locking parts need to be installed in sequence. The assembly steps are cumbersome, and the coaxiality adjustment is difficult. Later maintenance and disassembly require complete disassembly of the entire structure, which is inconvenient.

[0004] To address the aforementioned problems, this utility model proposes a fire hose reel that is easy to assemble. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model provides a fire hose reel that is easy to assemble, featuring a simple and easy-to-implement structure and high assembly efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fire hose reel that is easy to assemble, comprising a reel body, a limiting component, a hollow mounting truncated cone and a hanging arm, and further comprising a locking mechanism and a driving mechanism;

[0007] The limiting component includes a fixed limiting plate and a detachable limiting plate. The fixed limiting plate is fixedly connected to the first axial end of the reel body, and the detachable limiting plate is detachably connected to the second axial end of the reel body through an installation component.

[0008] The hanging arm is rotatably mounted on the hollow mounting platform via bearings;

[0009] The reel body is mounted on one end of a hollow mounting frustum via a locking mechanism. The locking mechanism includes locking blocks and L-shaped locking rods. Multiple locking blocks are fixed at equal intervals along the circumferential direction to the inner wall of the reel body, and each locking block has a locking groove. Multiple L-shaped locking rods are distributed at equal intervals along the circumferential direction and slidably mounted on one end of the hollow mounting frustum, and the vertical part of each L-shaped locking rod is adapted to the locking groove.

[0010] The drive mechanism is installed inside the hollow mounting truncated cone and is connected to the L-shaped locking rod for driving multiple L-shaped locking rods to move synchronously towards or away from each other.

[0011] The drive mechanism includes a threaded screw, a moving block, an I-shaped slider, and a connecting arm;

[0012] The threaded screw is rotatably mounted inside the hollow mounting frustum;

[0013] The movable block is located inside the hollow mounting frustum and is threadedly engaged with the threaded screw.

[0014] A guide slide hole is provided at one end of the hollow mounting frustum, the I-shaped slider is slidably installed in the guide slide hole, and the L-shaped locking rod is fixed to one end of the I-shaped slider;

[0015] The multiple connecting arms are distributed at equal intervals along the circumferential direction, and one end of each connecting arm is hinged to the moving block and the other end is hinged to the corresponding I-shaped slider.

[0016] As a preferred embodiment of this utility model, the vertical section of the L-shaped locking rod has a cross-sectional dimension equal to that of the locking groove.

[0017] As a preferred embodiment of this utility model, a handwheel is coaxially fixed at one end of the threaded screw.

[0018] As a preferred embodiment of this utility model, the outer wall of the I-shaped slider is fitted to the inner wall of the guide hole.

[0019] As a preferred embodiment of this utility model, the mounting component includes a fixing rod and a manual bolt;

[0020] The fixing rod has an internal threaded hole and is fixed to one end of the hollow mounting frustum;

[0021] The detachable limiting plate has an installation hole, and the manual bolt passes through the installation hole and is screwed into the internal thread hole of the fixing rod by thread engagement.

[0022] As a preferred technical solution of this utility model, one end of the hollow mounting truncated cone is fixed with a plurality of second positioning rods that are equally spaced along the circumference, and the fixed limiting plate is provided with a second positioning hole through which the second positioning rods pass.

[0023] As a preferred technical solution of this utility model, one end of the reel body is fixed with a plurality of first positioning rods that are equally spaced along the circumferential direction, and the detachable limiting plate is provided with a first positioning hole through which the first positioning rods pass.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] The built-in drive mechanism synchronously drives multiple sets of L-shaped locking rods to quickly lock or unlock the reel body and the hollow mounting platform. This eliminates the need to assemble scattered parts such as bearings, washers, and lock nuts in sequence, and also enables automatic coaxial alignment, improving installation accuracy. Combined with the manual bolt quick-installation structure of the detachable limit plate, the entire machine can be assembled and disassembled without special tools, significantly shortening the assembly and disassembly time and avoiding the problems of missing or incorrect parts.

[0026] Other additional advantages and beneficial effects of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this invention. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0030] Figure 3 This utility model Figure 2 A magnified schematic diagram of the locking mechanism in the diagram;

[0031] Figure 4 This utility model Figure 2 A magnified schematic diagram of the drive mechanism in the diagram;

[0032] Figure 5 This utility model Figure 2 Enlarged structural diagram at point A in the diagram;

[0033] Figure 6 This utility model Figure 2 A magnified structural diagram at point B in the diagram.

[0034] In the diagram: 1. Reel body; 11. First positioning rod; 2. Fixed limiting plate; 21. Second positioning hole; 3. Detachable limiting plate; 31. Mounting hole; 32. First positioning hole; 4. Mounting component; 41. Fixed rod; 42. Manual bolt; 5. Hollow mounting frustum; 51. Bearing; 52. Guide slide hole; 53. Second positioning rod; 6. Hanging arm; 7. Locking mechanism; 71. Locking block; 711. Locking groove; 72. L-shaped locking rod; 8. Drive mechanism; 81. Threaded screw; 82. Moving block; 83. I-shaped slider; 84. Connecting arm; 85. Handwheel. Detailed Implementation

[0035] 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.

[0036] Please see Figures 1-6 The present invention provides the following technical solution: a fire hose reel that is easy to assemble, including a reel body 1, a limiting component, a hollow mounting truncated cone 5 and a hanging arm 6, and also includes a locking mechanism 7 and a driving mechanism 8.

[0037] Depend on Figures 1-3 As shown, in this embodiment, the limiting component includes a fixed limiting plate 2 and a detachable limiting plate 3. The fixed limiting plate 2 is fixedly connected to the first axial end of the reel body 1, and the detachable limiting plate 3 is detachably connected to the second axial end of the reel body 1 through a mounting member 4. The hanging arm 6 is rotatably mounted on the hollow mounting frustum 5 through a bearing 51. The reel body 1 is mounted on one end of the hollow mounting frustum 5 through a locking mechanism 7. The locking mechanism 7 includes a locking block 71 and an L-shaped locking rod 72. Multiple locking blocks 71 are fixed at equal intervals along the circumferential direction to the inner wall of the reel body 1, and the locking blocks 71 are provided with locking grooves 711. Multiple L-shaped locking rods 72 are distributed at equal intervals along the circumferential direction and slidably mounted on one end of the hollow mounting frustum 5, and the vertical part of the L-shaped locking rod 72 is adapted to the locking groove 711. The driving mechanism 8 is installed in the hollow mounting frustum 5 and is connected to the L-shaped locking rods 72 for driving multiple L-shaped locking rods 72 to move synchronously towards or away from each other.

[0038] Specifically, the limiting component is used to axially limit the fire hose wound on the outer wall of the reel body 1 to prevent the hose from loosening, misaligning, or stacking during the winding and unwinding process; the fixed limiting plate 2 and the reel body 1 are integrally stamped or fully welded to ensure the structural connection strength and coaxiality; the detachable limiting plate 3 has a detachable design to facilitate the initial winding, subsequent replacement, and maintenance of the fire hose.

[0039] The locking mechanism 7 achieves synchronous circumferential and axial locking of the reel body 1 and the hollow mounting frustum 5 by engaging the L-shaped locking rod 72 into the locking groove 711. This ensures that the reel body 1 and the hollow mounting frustum 5 can rotate coaxially and synchronously, avoiding problems such as eccentricity, radial sway, and axial movement after assembly. Multiple sets of equally spaced circumferentially distributed locking blocks 71 cooperate with the L-shaped locking rod 72 to ensure that the locking force is evenly distributed along the circumference, greatly improving the stability and torsional resistance of the structural connection.

[0040] The drive mechanism 8 can synchronously drive multiple sets of L-shaped locking rods 72 to move radially, enabling synchronous locking and unlocking of all locking points in one go. This eliminates the need to operate the locking components one by one, greatly simplifying the assembly process and improving assembly efficiency.

[0041] Depend on Figures 1-3 As shown in this embodiment, the vertical section of the L-shaped locking rod 72 is equal to the size of the locking groove 711. Specifically, the vertical section of the L-shaped locking rod 72 can be completely embedded in the locking groove 711 to achieve a gapless fit, eliminating the gaps caused by circumferential movement and radial swaying after the reel body 1 is assembled, ensuring the coaxiality and operational stability of the reel body 1 during rotation, and improving the reliability of the locking structure to prevent the locking from loosening due to vibration and torque impact during the retraction and extension of the fire hose.

[0042] Depend on Figures 1-4 As shown, in this embodiment, the driving mechanism 8 includes a threaded screw 81, a moving block 82, an I-shaped slider 83, and connecting arms 84. The threaded screw 81 is rotatably mounted inside the hollow mounting frustum 5. The moving block 82 is located inside the hollow mounting frustum 5 and is threadedly engaged with the threaded screw 81. A guide hole 52 is provided at one end of the hollow mounting frustum 5, and the I-shaped slider 83 is slidably mounted inside the guide hole 52. An L-shaped locking rod 72 is fixed to one end of the I-shaped slider 83. Multiple connecting arms 84 are evenly distributed along the circumferential direction, and one end of the connecting arm 84 is hinged to the moving block 82, and the other end is hinged to the corresponding I-shaped slider 83.

[0043] Specifically, the threaded screw 81 is coaxially arranged with the hollow mounting frustum 5, and its two ends are rotatably supported at both ends of the inner cavity of the hollow mounting frustum 5 by bearings with seats, ensuring the coaxiality of the rotation of the threaded screw 81. By rotating the threaded screw 81, the transmission principle of the screw nut can be used to drive the moving block 82 to make stable linear reciprocating movement along the axial direction of the hollow mounting frustum 5. When the moving block 82 moves axially, it drives the corresponding I-shaped slider 83 to move radially linearly along the guide slide hole 52 through multiple sets of hinged connecting arms 84, thereby driving the L-shaped locking rod 72 to move radially synchronously, and finally realizing the synchronous opposite (radial inward) or opposite (radial outward) movement of multiple sets of L-shaped locking rods 72.

[0044] At the same time, the linkage of the connecting arm 84 enables the synchronous action of multiple sets of L-shaped locking rods 72, which can automatically complete the coaxial alignment of the reel body 1 and the hollow mounting frustum 5 during the locking process, eliminating the need for repeated manual adjustments to the coaxiality, greatly reducing assembly difficulty and improving assembly accuracy.

[0045] Depend on Figures 1-4As shown in this embodiment, a handwheel 85 is coaxially fixed at one end of the threaded screw 81. Specifically, the handwheel 85 is located on the outer end face of the hollow mounting frustum 5 away from the reel body 1. Operators do not need to use special tools such as wrenches and screwdrivers. They can drive the threaded screw 81 to rotate by simply turning the handwheel 85 by hand, which can quickly complete the locking and unlocking operation of the locking mechanism 7. This further simplifies the assembly and disassembly steps and is suitable for rapid assembly and emergency maintenance scenarios on construction sites where there are no special tools.

[0046] Depend on Figures 1-4 As shown in this embodiment, the outer wall of the I-shaped slider 83 is attached to the inner wall of the guide slide hole 52. Specifically, the upper and lower flanges of the I-shaped slider 83 are attached to the inner and outer end faces of the guide slide hole 52, respectively, and the web of the I-shaped slider 83 is attached to the radial hole wall of the guide slide hole 52, thereby achieving full circumferential limiting constraint. This ensures that the I-shaped slider 83 can only move linearly along the set radial path of the guide slide hole 52, avoiding axial movement and circumferential deflection. This ensures that the movement path of the L-shaped locking rod 72 is accurate and controllable, ensuring the precise alignment of the L-shaped locking rod 72 and the locking groove 711, improving the reliability of locking and unlocking actions, and avoiding jamming problems.

[0047] Depend on Figure 1 and Figure 2 As shown, in this embodiment, the mounting component 4 includes a fixing rod 41 and a manual bolt 42; the fixing rod 41 has an internal threaded hole and is fixed to one end of the hollow mounting frustum 5; the detachable limiting plate 3 has a mounting hole 31, and the manual bolt 42 passes through the mounting hole 31 and is screwed into the internal threaded hole of the fixing rod 41 by thread engagement.

[0048] Specifically, the fixing rod 41 and the hollow mounting frustum 5 are fixed by welding or integral molding to ensure connection strength and positional accuracy; the manual bolt 42 allows the installation and removal of the detachable limiting plate 3 to be completed by hand rotation.

[0049] During assembly, the manual bolt 42 passes through the mounting hole 31 of the detachable limiting plate 3, and is screwed into the internal thread hole of the fixing rod 41 and tightened to complete the axial fixation of the detachable limiting plate 3. At the same time, the detachable limiting plate 3 achieves axial limitation of the reel body 1, preventing axial movement of the reel body 1 during operation. The structure is simple, the operation is convenient, and the assembly and disassembly efficiency is high.

[0050] Depend on Figure 1 , Figure 2 and Figure 5As shown in this embodiment, one end of the hollow mounting frustum 5 is fixed with a plurality of second positioning rods 53 evenly distributed along the circumferential direction. The fixed limiting plate 2 is provided with a second positioning hole 21 for the second positioning rods 53 to pass through. With the above solution, when assembling the reel body 1, the second positioning hole 21 on the fixed limiting plate 2 is aligned with the second positioning rod 53 on the hollow mounting frustum 5 and fully inserted. This enables the reel body 1 and the hollow mounting frustum 5 to be quickly pre-positioned, automatically ensuring the initial coaxiality of the reel body 1 and the hollow mounting frustum 5. At the same time, the locking groove 711 on the locking block 71 on the inner wall of the reel body 1 and the L-shaped locking rod 72 are precisely circumferentially aligned, eliminating the need for repeated manual adjustment of the alignment angle and further improving assembly efficiency.

[0051] Meanwhile, the second positioning rod 53 can play an auxiliary circumferential limiting role on the fixed limiting plate 2, and cooperate with the locking mechanism 7 to form a double circumferential locking, ensuring that the reel body 1 and the hollow mounting frustum 5 rotate synchronously after locking without relative sliding, thus improving transmission stability.

[0052] Depend on Figure 1 , Figure 2 and Figure 6 As shown in this embodiment, one end of the reel body 1 is fixed with a plurality of first positioning rods 11 evenly spaced along the circumferential direction. The detachable limiting plate 3 is provided with a first positioning hole 32 through which the first positioning rods 11 pass. With the above solution, when installing the detachable limiting plate 3, the first positioning hole 32 on the detachable limiting plate 3 is aligned with the first positioning rod 11 at the end of the reel body 1 and fully inserted, which can realize the quick pre-positioning of the detachable limiting plate 3, automatically ensure the coaxiality of the detachable limiting plate 3 and the reel body 1, and at the same time make the mounting hole 31 on the detachable limiting plate 3 and the fixing rod 41 accurately aligned, which facilitates the quick screwing and installation of the manual bolt 42 without the need for manual adjustment of the hole position.

[0053] Meanwhile, the first positioning rod 11 can play a circumferential limiting role on the detachable limiting plate 3, ensuring that the detachable limiting plate 3 and the reel body 1 rotate synchronously, avoiding relative rotation that could cause the manual bolt 42 to loosen, and improving the stability of the structure operation.

[0054] Components not described in detail in this article are existing technologies.

[0055] The working principle and usage process of this utility model are as follows: When using this utility model, the hanging arm 6 is pre-assembled by rotating it on the outer wall of the hollow mounting frustum 5 via the bearing 51; the threaded screw 81, moving block 82, I-shaped slider 83, and connecting arm 84 of the drive mechanism 8 are sequentially assembled into the inner cavity of the hollow mounting frustum 5, and the handwheel 85 is coaxially fixed to the outer end of the threaded screw 81. At the same time, the L-shaped locking rod 72 is welded and fixed to the outer end of the I-shaped slider 83, thus completing the pre-assembly of the drive mechanism 8 and the locking mechanism 7; the fixed limiting plate 2 and the first axial end of the reel body 1 are integrally formed and processed, and the locking block 71 is welded and fixed to the inner wall of the reel body 1, thus completing the pre-processing of the reel body 1.

[0056] Rotate the handwheel 85 in the forward direction, and drive the multiple sets of L-shaped locking rods 72 to move radially inward to the retraction position through the drive mechanism 8; align the end of the reel body 1 with the fixed limiting plate 2 towards the hollow mounting truncated cone 5, so that the second positioning hole 21 on the fixed limiting plate 2 is aligned with the second positioning rod 53 on the hollow mounting truncated cone 5 and fully inserted, thus completing the pre-positioning of the reel body 1. At this time, the locking groove 711 of the locking block 71 and the position of the L-shaped locking rod 72 are radially corresponding one-to-one.

[0057] Rotating the handwheel 85 in the opposite direction causes the moving block 82 to move axially toward the reel body 1 via the rotation of the threaded screw 81. This, in turn, pushes the I-shaped slider 83 and the L-shaped locking rod 72 to move radially outward synchronously via the hinged connecting arm 84, so that the vertical part of the L-shaped locking rod 72 is completely engaged in the locking groove 711 of the corresponding locking block 71 until the handwheel 85 can no longer rotate, thus completing the locking assembly of the reel body 1 and the hollow mounting frustum 5. At this time, the reel body 1 and the hollow mounting frustum 5 are automatically coaxially aligned without radial clearance, axial movement, or circumferential slippage.

[0058] The fire hose is evenly wound around the outer wall of the reel body 1. After the hose is wound, the first positioning hole 32 on the detachable limiting plate 3 is aligned with the first positioning rod 11 at the end of the reel body 1 and fully inserted. At this time, the mounting hole 31 of the detachable limiting plate 3 and the internal thread hole of the fixing rod 41 are coaxially aligned. The manual bolt 42 is passed through the mounting hole 31 and screwed into the internal thread hole of the fixing rod 41 and tightened by hand to complete the installation of the detachable limiting plate 3, thus completing the assembly of the entire fire hose reel.

[0059] When maintenance, repair, or replacement of aging hoses is required, simply unscrew the manual bolt 42 by hand in reverse to quickly remove the removable limit plate 3 and directly replace, clean, and maintain the hoses.

[0060] When the reel body 1 needs to be completely disassembled for overhaul, simply turn the handwheel 85 forward. The drive mechanism 8 will drive the L-shaped locking rod 72 to move radially inward in sync, so that the L-shaped locking rod 72 is completely disengaged from the locking groove 711. The reel body 1 can then be directly removed horizontally from the hollow mounting platform 5, thus completing the disassembly of the core component.

[0061] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fire hose reel that is easy to assemble, comprising a reel body (1), a limiting component, a hollow mounting truncated cone (5), and a hanging arm (6), characterized in that: It also includes a locking mechanism (7) and a driving mechanism (8); The limiting assembly includes a fixed limiting plate (2) and a detachable limiting plate (3). The fixed limiting plate (2) is fixedly connected to the first axial end of the reel body (1), and the detachable limiting plate (3) is detachably connected to the second axial end of the reel body (1) through a mounting component (4). The hanging arm (6) is rotatably mounted on the hollow mounting platform (5) via a bearing (51); The reel body (1) is installed at one end of the hollow mounting frustum (5) by a locking mechanism (7). The locking mechanism (7) includes locking blocks (71) and L-shaped locking rods (72). Multiple locking blocks (71) are fixed at equal intervals along the circumferential direction to the inner wall of the reel body (1), and locking slots (711) are provided on the locking blocks (71). Multiple L-shaped locking rods (72) are distributed at equal intervals along the circumferential direction and slidably installed at one end of the hollow mounting frustum (5), and the vertical part of the L-shaped locking rods (72) is adapted to the locking slots (711). The drive mechanism (8) is installed inside the hollow mounting truncated cone (5) and is connected to the L-shaped locking rod (72) for driving multiple L-shaped locking rods (72) to move synchronously towards or away from each other; The drive mechanism (8) includes a threaded screw (81), a moving block (82), an I-shaped slider (83), and a connecting arm (84). The threaded screw (81) is rotatably mounted inside the hollow mounting frustum (5); The movable block (82) is located inside the hollow mounting frustum (5) and is threadedly engaged with the threaded screw (81); The hollow mounting truncated cone (5) has a guide sliding hole (52) at one end, the I-shaped slider (83) is slidably installed in the guide sliding hole (52), and the L-shaped locking rod (72) is fixed to one end of the I-shaped slider (83); Multiple connecting arms (84) are distributed at equal intervals along the circumferential direction, and one end of each connecting arm (84) is hinged to the moving block (82) and the other end is hinged to the corresponding I-shaped slider (83).

2. The fire hose reel for easy assembly according to claim 1, characterized in that: The vertical section of the L-shaped locking rod (72) has the same cross-sectional dimension as the locking groove (711).

3. The fire hose reel for easy assembly according to claim 1, characterized in that: A handwheel (85) is coaxially fixed at one end of the threaded screw (81).

4. The fire hose reel for easy assembly according to claim 1, characterized in that: The outer wall of the I-shaped slider (83) fits against the inner wall of the guide hole (52).

5. A fire hose reel for easy assembly according to claim 1, characterized in that: The mounting component (4) includes a fixing rod (41) and a manual bolt (42). The fixing rod (41) has an internal threaded hole and is fixed to one end of the hollow mounting frustum (5); The detachable limiting plate (3) has an installation hole (31). The manual bolt (42) passes through the installation hole (31) and is screwed into the internal thread hole of the fixing rod (41) by thread engagement.

6. The fire hose reel for easy assembly according to claim 1, characterized in that: One end of the hollow mounting truncated cone (5) is fixed with a plurality of second positioning rods (53) that are equally spaced along the circumference, and the fixed limiting plate (2) is provided with a second positioning hole (21) through which the second positioning rods (53) pass.

7. A fire hose reel for easy assembly according to claim 1, characterized in that: One end of the reel body (1) is fixed with a plurality of first positioning rods (11) evenly distributed along the circumferential direction, and the detachable limiting plate (3) is provided with a first positioning hole (32) through which the first positioning rods (11) pass.

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