Optical fiber distribution box for tail cable coiling

Abstract

The utility model provides an optical fiber distribution box for tail cable coiling and storage, and relates to the technical field of optical communication equipment. The optical fiber distribution box comprises an upper box body, a cable storage rotating disc and a lower box body, the lower box body is hollow, one end of the lower box body is an open end, the upper box body is located at the open end and connected with the lower box body, the upper box body is hollow, an optical splitter and a first adapter are installed in the upper box body, and a second adapter is arranged on the side wall of the upper box body. The first adapter is used for being connected with a tail cable and is connected with the input end of the optical splitter through an optical fiber, the second adapter is used for being connected with user equipment, and the cable storage turntable is rotationally mounted in the lower box body and is used for coiling the tail cable. In the on-site wiring process, the using length of the tail cable can be adaptively adjusted through rotation of the cable storage rotating disc, the adaptability of the length of the tail cable and the actual wiring required length is achieved, secondary wire arrangement of the tail cable is avoided, and therefore the wiring efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication equipment, in particular to an optical fiber splitter box for storing tail cables. Background Art

[0002] Currently, due to the inability to determine the actual required length at the wiring site, the length of the tail cable is often longer when it leaves the factory. After the on-site wiring is completed, the fiber routing is messy and the tail cable needs to be managed again, which reduces construction efficiency. Utility Model Content

[0003] The problem solved by the utility model is how to improve the efficiency of pigtail cable connection.

[0004] To solve the above problems, the utility model provides a fiber optic splitter box for storing tail cables, comprising an upper box body, a cable storage turntable and a lower box body, the lower box body is hollow inside and has an open end at one end, the upper box body is located at the open end and is connected to the lower box body, the cable storage turntable is rotatably installed in the lower box body, and is used for storing tail cables; the upper box body is hollow inside, and a splitter and a first adapter are installed inside the upper box body, and a second adapter is provided on the side wall of the upper box body, the first adapter is used to connect the tail cable and is connected to the input end of the splitter through an optical fiber, and the second adapter is used to connect to a user device.

[0005] Optionally, the cable storage turntable has an edge that is configured as an annular groove, and the cable storage turntable is further provided with a cable tie slot.

[0006] Optionally, the fiber optic distribution box for storing tail cables also includes a box cover, the upper box body is hollow inside, and the end of the upper box body away from the lower box body is the upper box body opening end, the box cover is located at the upper box body opening end and is detachably connected to the upper box body.

[0007] Optionally, a fiber winding ring and a fiber-stopping ear are further provided inside the upper box body, the fiber winding ring is used for winding the optical fiber, and the fiber-stopping ear is used for limiting the position of the wound optical fiber.

[0008] Optionally, the fiber optic distribution box for storing tail cables further includes anti-theft screws, a countersunk hole is provided on the box cover, and a connecting column is further provided inside the upper box body. The anti-theft screw passes through the countersunk hole and is threadedly connected to the connecting column to prevent theft.

[0009] Optionally, a cover plate is provided at the countersunk hole, and the cover plate is used to cover the countersunk hole.

[0010] Optionally, a rotating shaft is provided on the bottom plate of the lower box body, one end of the rotating shaft is connected to the bottom plate, and the other end extends vertically toward the upper box body and is provided with a clamping block, the cable storage turntable is sleeved on the rotating shaft, and the axial movement of the cable storage turntable is limited by the clamping block.

[0011] Optionally, a receiving groove is provided on one end of the bottom plate of the upper box body facing the lower box body, the receiving groove is used to receive a portion of the tail cable connected to the first adapter, and the tail cable is used to pass through the receiving groove and be connected to the first adapter.

[0012] Optionally, the upper box body is rotatably connected to the lower box body, and / or the upper box body is connected to the lower box body via a buckle.

[0013] Optionally, a cable outlet is provided on the side wall of the lower box body, and a cable outlet sealing ring is provided at the cable outlet.

[0014] Compared with the prior art, the optical fiber splitter box for storing tail cables of the present invention has an upper box body, and the upper box body and the lower box body form two relatively independent cavities. During on-site wiring, the first adapter and the optical splitter can be installed inside the upper box body. The upper box body protects the first adapter and the optical splitter, and the tail cable is pre-stored in the lower box body through the cable storage turntable. The use length of the tail cable can be adaptively adjusted by rotating the cable storage turntable, and the remaining length of the tail cable can still be wound on the cable storage turntable, which not only can achieve the protection effect of the tail cable, but also can achieve the adaptability of the tail cable length to the actual wiring requirement length, and avoid secondary cable management of the tail cable, thereby improving wiring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the cable storage turntable in the embodiment of the present utility model;

[0016] Figure 2 This is a schematic structural diagram of the upper box body in an embodiment of the present utility model;

[0017] Figure 3 This is a schematic structural diagram of a box cover in an embodiment of the present utility model;

[0018] Figure 4 This is a schematic structural diagram of the rotating shaft in an embodiment of the present utility model;

[0019] Figure 5 It is a structural schematic diagram of the bottom of the upper box body in an embodiment of the present utility model.

[0020] Description of reference numerals:

[0021] 1-upper box body; 11-fiber winding ring; 12-fiber blocking ear; 13-accommodating groove; 131-positioning hole; 2-cable storage turntable; 21-annular groove; 211-cable tie slot; 3-lower box body; 31-cable outlet sealing ring; 4-box cover; 5-anti-theft screw; 6-connecting wall; 61-block; 7-cover plate; 10-first adapter; 20-second adapter. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] In the accompanying drawings, the Z-axis represents a vertical position, and the positive direction of the Z-axis (that is, the direction of the arrow on the Z-axis) represents the upper side, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents the lower side; in the accompanying drawings, the X-axis represents a horizontal position, and the positive direction of the X-axis (that is, the direction of the arrow on the X-axis) represents the right side, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents the left side; in the accompanying drawings, the Y-axis represents a front-to-back position, and the positive direction of the Y-axis (that is, the direction of the arrow on the Y-axis) represents the rear side, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents the front side. It should also be noted that the aforementioned Z-axis, Y-axis, and X-axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0025] Combine Figure 1 、 Figure 2 and Figure 5 As shown, the utility model provides an optical fiber splitter box for storing tail cables, comprising an upper box body 1, a cable storage turntable 2 and a lower box body 3. The lower box body 3 is hollow inside and has an open end at one end. The upper box body 1 is located at the open end and connected to the lower box body 3. The cable storage turntable 2 is rotatably installed in the lower box body 3 and is used for storing tail cables; the upper box body 1 is hollow inside, and an optical splitter and a first adapter 10 are installed inside the upper box body 1. A second adapter 20 is provided on the side wall of the upper box body 1. The first adapter 10 is used to connect the tail cable and is connected to the input end of the optical splitter through an optical fiber. The second adapter 20 is used to connect to the user equipment.

[0026] Specifically, the upper box body 1 and the lower box body 3 can both be selected to be rectangular, and the interiors of the upper box body 1 and the lower box body 3 are both hollow. The upper end of the lower box body 3 can be selected to be an open end, and the cable outlet 31 can be set on the side wall of the lower box body 3 facing the positive direction of the Y axis. A rotating shaft perpendicular to the bottom plate is installed on the bottom plate of the lower box body 3. The rotating shaft is located inside the lower box body 3. An assembly hole is provided at the axis of the cable storage turntable 2 so that it can be sleeved on the rotating shaft and rotate around the axis of the rotating shaft. On the circumference of the cable storage turntable 2, an annular groove 21 is provided at the edge of the cable storage turntable 2. The tail cable can be coiled in the annular groove 21 for storage. The bottom plate of the upper box body 1 is located at the open end of the lower box body 3 and can be installed at the open end of the lower box body 3 by means of snaps or the like. The bottom plate of the upper box body 1 and the lower box body 3 form an independent chamber, so that the cable storage turntable 2 is isolated, and the protection of the cable storage turntable 2 can be achieved. Figure 2 As shown, the upper box body 1 also has an internal hollow structure, and a first adapter 10 and a second adapter 20 are arranged in its cavity. One end of the first adapter 10 is connected to the pigtail cable, and the other end is used to connect to the input end of the optical splitter through an optical fiber. The second adapter 20 is located on the side wall of the upper box body 1 and is provided with two rows of card slots, with 9 slots in each row. The end of the second adapter 20 facing the interior of the upper box body 1 is connected to the output end of the optical splitter through an optical fiber, and the end of the second adapter 20 facing the outside of the upper box body 1 serves as the user connection end. During use, the optical splitter is fixedly mounted inside the upper housing 1, and the pigtail cable is stored in the annular groove 21 on the cable storage turntable 2. It is then secured to the cable storage turntable 2 with nylon tie wraps. Upon arrival at the installation site, the upper housing 1 is opened to expose the open end of the lower housing 3. The tie wrap and the pigtail cable dust cap are removed. The cable storage turntable 2 is manually rotated to guide one end of the pigtail cable out of the cable outlet on the lower housing 3. After adjusting the pigtail cable to the appropriate length, the other end is inserted into the first adapter 10. The input end of the optical splitter is connected to the first adapter 10, and the output end of the optical splitter is connected to the second adapter 20 via optical fiber, thus forming a fiber optic path. The remaining pigtail cable can be stored in the cable storage turntable 2 when not in use.

[0027] Therefore, in this embodiment, the upper box body 1 and the lower box body 3 form two relatively independent cavities. During the on-site wiring process, the first adapter 10 and the optical splitter can be installed inside the upper box body 1. The upper box body 1 protects the first adapter 10 and the optical splitter, and the pigtail cable is pre-stored in the lower box body 3 through the cable storage turntable 2. The usable length of the pigtail cable can be adaptively adjusted by rotating the cable storage turntable 2, and the remaining length of the pigtail cable can still be wound on the cable storage turntable 2. Not only can the protection effect of the pigtail cable be achieved, but also the adaptability of the pigtail cable length to the actual wiring requirement can be achieved, and secondary cable management of the pigtail cable can be avoided, thereby improving wiring efficiency.

[0028] Optionally, combined Figure 5As shown, a receiving groove 13 is provided on one end of the bottom plate of the upper box body 1 facing the lower box body 3 . The receiving groove 13 is used to receive part of the tail cable connected to the first adapter 10 . The tail cable is used to pass through the receiving groove 13 and connect to the first adapter 10 .

[0029] Specifically, a receiving groove 13 is provided on the bottom plate of the upper box body 1, the notch of the receiving groove 13 faces the interior of the lower box body 3, and a positioning hole 131 is provided on the side wall of the receiving groove 13. When wiring, part of the tail cable connected to the first adapter 10 can pass through the positioning hole 131 to connect to the first adapter 10.

[0030] In this way, by providing the accommodating groove 13 at one end of the bottom plate of the upper box body 1 facing the lower box body 3, part of the pigtail cable connected to the first adapter 10 can be stored in the accommodating groove 13 and then passed through the accommodating groove 13 to be connected to the first adapter 10, thereby reducing the space occupied by the pigtail cable in the interior of the upper box body 3 after wiring, so that the upper box body 1 can be easily buckled onto the lower box body 3 after the pigtail cable is connected.

[0031] Optionally, combined Figure 1 As shown, the cable storage turntable 2 has an edge that is configured as an annular groove 21 , and a cable tie slot 211 is provided on the cable storage turntable 2 .

[0032] Specifically, an annular groove 21 is located at the edge of the cable storage turntable 2 and extends along the circumference of the cable storage turntable 2. Two cable tie slots 211 are provided at the upper end of the cable storage turntable 2. The tail cable is stored in the annular groove 21, and cable ties are wrapped around the leading and trailing ends of the tail cable. The cable ties are then passed through the cable tie slots 211 to temporarily secure the leading and trailing ends of the tail cable to the cable storage turntable 2. The cable ties can be removed from the cable tie slots 211 during actual wiring.

[0033] In this way, the cable storage turntable 2 is provided with an annular groove 21 on its rim and a tie slot 211 , which can temporarily fix the tail cable and improve the stability of the tail cable reel in the annular groove 21 .

[0034] Optionally, combined Figure 3 As shown, the optical fiber distribution box for storing tail cables also includes a box cover 4. The upper box body 1 is hollow inside, and the end of the upper box body 1 away from the lower box body 3 is the upper box body opening end. The box cover 4 is located at the upper box body opening end and is detachably connected to the upper box body 1.

[0035] Specifically, the upper box body 1 is hollow inside, and the end of the upper box body 1 facing the positive direction of the Z axis is the opening end of the upper box body, that is, the upper end of the upper box body 1. The box cover 4 can be a plastic plate. The box cover 4 is located at the opening end of the upper box body and can be detachably connected to the upper box body 1 by connectors such as snaps or screws.

[0036] In this way, the end of the upper box body 1 away from the lower box body 3 is used as the opening end of the upper box body, and the box cover 4 is located at the opening end of the upper box body and is detachably connected to the upper box body 1. After the upper box body 1 is connected, the box cover 4 can cover the opening end of the upper box body to ensure the airtightness of the interior of the upper box body 1. At the same time, during the process of wiring the optical cable, the box cover 4 can also be removed from the upper box body 1 to facilitate wiring.

[0037] Optionally, combined Figure 2 As shown, a fiber winding ring 11 and a fiber stop ear 12 are further provided inside the upper box body 1. The fiber winding ring 11 is used for winding the optical fiber, and the fiber stop ear 12 is used for limiting the position of the wound optical fiber.

[0038] Specifically, the fiber winding ring 11 guides the routing of the optical fiber inside the upper box body 1, and after routing, the optical fiber is limited to the fiber winding ring 11 by the fiber blocking ear 12 to prevent the optical fiber from escaping from the fiber winding ring 11 and causing messy routing.

[0039] In this way, a fiber winding ring 11 and a fiber stopping ear 12 are also provided inside the upper box body 1. The fiber winding ring 11 is used for winding the optical fiber, and the fiber stopping ear 12 is used to limit the wound optical fiber. On the one hand, the fiber winding ring 11 can be used to guide the routing of the optical fiber. On the other hand, the fiber stopping ear 12 can also ensure that the optical fiber will not separate from the fiber winding ring 11 after routing, so as to ensure the stability of the optical fiber routing.

[0040] Optionally, combined Figure 2 and Figure 3 As shown, the optical fiber distribution box for storing tail cables also includes anti-theft screws 5, a countersunk hole is provided on the box cover 4, and a connecting column is also provided inside the upper box body 1. The anti-theft screws 5 pass through the countersunk hole and are threadedly connected to the connecting column to prevent theft.

[0041] Specifically, after the box cover 4 is installed at the upper box body opening end of the upper box body 1, the anti-theft screw 5 passes through the countersunk hole provided on the box cover 4 and is threadedly connected to the connecting column to prevent theft.

[0042] In this way, the anti-theft screw 5 is passed through the countersunk hole provided on the box cover 4 and threadedly connected to the connecting column provided inside the upper box body 1 to prevent theft. While achieving anti-theft, it can also improve the stability of the connection between the box cover 4 and the upper box body 1.

[0043] Optionally, combined Figure 1 and Figure 4 As shown, a rotating shaft is provided on the bottom plate of the lower box body 3, one end of the rotating shaft is connected to the bottom plate, and the other end extends vertically toward the upper box body 1 and is provided with a clamping block 61. The cable storage turntable 2 is sleeved on the rotating shaft, and the axial movement of the cable storage turntable 2 is limited by the clamping block 61.

[0044] Specifically, the rotating shaft is located at the center of the bottom plate of the lower box body 3 and is perpendicular to the bottom plate. The lower end of the rotating shaft is fixedly connected to the bottom plate of the lower box body 3, and the upper end of the rotating shaft extends vertically upward. A clamping block 61 is installed at the upper end of the rotating shaft. After the cable storage turntable 2 is mounted on the rotating shaft, the rotating shaft limits the radial movement of the cable storage turntable 2. The clamping block 61 at the upper end of the rotating shaft can also limit the axial movement of the cable storage turntable 2, ensuring the stability of the cable storage turntable 2 on the rotating shaft. Based on the above embodiment, the rotating shaft can also be a hollow shaft, and the hollow shaft is evenly divided into four spaced connecting walls 6 along the circumference of the rotating shaft. A clamping block 61 is provided at the upper end of each connecting wall 6. One end of the clamping block 61 is fixed to the connecting wall 6 and connected, and the other end extends away from the rotating shaft in the radial direction of the rotating shaft. When the cable storage turntable 2 is installed, the mounting hole of the cable storage turntable 2 presses down the four clamping blocks 61. The four clamping blocks 61 are subjected to the extrusion force toward the axis of the rotating shaft. The four clamping blocks 61 move closer to each other and pass through the mounting hole of the cable storage turntable 2. Then, the cable storage turntable 2 is sleeved on the four connecting walls 6. At the same time, the four clamping blocks 61 are reset to clamp the cable storage turntable 2 on the four connecting walls 6.

[0045] In this way, one end of the rotating shaft is connected to the bottom plate, and the other end extends vertically toward the upper box body 1 and is provided with a clamping block 61. The cable storage turntable 2 is sleeved on the rotating shaft, and the axial movement of the cable storage turntable 2 is limited by the clamping block 61. The clamping block 61 can prevent the cable storage turntable 2 from detaching from the rotating shaft to ensure the stable rotation of the cable storage turntable 2 in the lower box body 3.

[0046] Optionally, combined Figure 3 As shown, a cover plate 7 is provided at the countersunk hole, and the cover plate 7 is used to cover the countersunk hole.

[0047] Specifically, the countersunk hole is located at the center of the box cover 4, and the cover plate 7 can be selected as a rubber cover. After the box cover 4 is installed on the upper box body 1, the cover plate 7 is embedded in the countersunk hole to cover the anti-theft screw 6.

[0048] In this way, a cover plate 7 is provided at the countersunk hole. The cover plate 7 is used to cover the countersunk hole. The cover plate 7 can cover the anti-theft screw 6 to prevent the anti-theft screw 6 from being corroded.

[0049] Optionally, combined Figure 2 As shown, the upper box body 1 and the lower box body 3 are rotatably connected, and / or, the upper box body 1 and the lower box body 3 are connected by a buckle.

[0050] Specifically, the left end of the upper box body 1 is rotatably connected to the left end of the lower box body 3 through a connecting shaft to realize the rotation of the upper box body 1 relative to the lower box body 3. Further, the upper box body 1 can be rotated 180° relative to the lower box body 3 to realize the flattening of the upper box body 1; or, a buckle is provided on the upper box body 1, and a slot is provided at the position of the buckle corresponding to the lower box body 3, and the buckle is engaged with the slot to connect the upper box body 1 and the lower box body 3; or, the left end of the upper box body 1 is rotatably connected to the lower box body 3, and at the same time, the right end of the upper box body 1 is connected to the right end of the lower box body 3 by a buckle.

[0051] In this way, the upper box body 1 and the lower box body 3 are rotatably connected, and / or the upper box body 1 and the lower box body 3 are connected by a snap buckle, which not only facilitates the connection between the upper box body 1 and the lower box body 3, but also ensures the stability of the upper box body 1 on the lower box body 3 after the optical cable is connected, so that the upper box body 1 can stably cover the lower box body 3 and ensure the sealing of the lower box body 3.

[0052] Optionally, combined Figure 2 and Figure 3 As shown, a cable outlet is provided on the side wall of the lower box body 3, and a cable outlet sealing ring 31 is provided at the cable outlet.

[0053] Specifically, the cable outlet sealing ring 31 can be made of rubber. The cable outlet sealing ring 31 made of rubber is stuck in the cable outlet, and the tail cable can be led out from the lower box body 3 through the through hole in the middle of the cable outlet sealing ring 31.

[0054] In this way, a cable outlet sealing ring 31 is provided at the cable outlet, which can not only reduce the wear caused by direct contact between the tail cable and the lower box body 3, but also prevent external dust from entering the lower box body 3, thereby improving the sealing performance of the cable outlet.

[0055] Optionally, combined Figures 1 to 3 As shown, a wall hanging structure is provided on the lower box body 3.

[0056] Specifically, the wall hanging structure can be a wall hanging hole or a clamp, etc., which can enable the lower box body 3 to be hung on the wall. Taking the wall hanging hole as an example, the wall hanging hole can be set on the bottom wall of the lower box body 3, and the lower box body 3 can be hung on the wall by passing a screw through the wall hanging hole.

[0057] In this way, by utilizing the wall-hanging structure provided on the lower box body 3 , the lower box body 3 can be installed on a wall or other location through the wall-hanging structure, thereby improving the installation convenience of the lower box body 3 .

[0058] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An optical fiber splitter box for storing tail cables, characterized in that: The utility model comprises an upper box body (1), a cable storage turntable (2) and a lower box body (3); the lower box body (3) is hollow inside and has an open end at one end; the upper box body (1) is located at the open end and is connected to the lower box body (3); the cable storage turntable (2) is rotatably installed in the lower box body (3) and is used for storing the tail cable; the upper box body (1) is hollow inside; an optical splitter and a first adapter (10) are installed inside the upper box body (1); a second adapter (20) is provided on the side wall of the upper box body (1); the first adapter (10) is used to connect the tail cable and is connected to the input end of the optical splitter through an optical fiber; the second adapter (20) is used to connect to the user equipment.

2. The optical fiber distribution box for storing tail cables according to claim 1, characterized in that: The cable storage turntable (2) has a disk edge configured as an annular groove (21), and the cable storage turntable (2) is further provided with a cable tie slot (211).

3. The optical fiber distribution box for storing tail cables according to claim 1, characterized in that: The box cover (4) is also included. The end of the upper box body (1) away from the lower box body (3) is the opening end of the upper box body (1). The box cover (4) is located at the opening end of the upper box body (1) and is detachably connected to the upper box body (1).

4. The optical fiber distribution box for storing tail cables according to claim 3, characterized in that: A fiber winding ring (11) and a fiber stop ear (12) are also provided inside the upper box body (1); the fiber winding ring (11) is used for winding the optical fiber, and the fiber stop ear (12) is used for limiting the position of the wound optical fiber.

5. The optical fiber distribution box for storing tail cables according to claim 3, characterized in that: It also includes an anti-theft screw (5), a countersunk hole is provided on the box cover (4), and a connecting column is provided inside the upper box body (1), and the anti-theft screw (5) passes through the countersunk hole and is threadedly connected to the connecting column to prevent theft.

6. The optical fiber distribution box for storing tail cables according to claim 5, characterized in that: A cover plate (7) is provided at the countersunk hole, and the cover plate (7) is used to cover the countersunk hole.

7. The optical fiber distribution box for storing tail cables according to claim 1, characterized in that: A rotating shaft is provided on the bottom plate of the lower box body (3), one end of the rotating shaft is connected to the bottom plate, and the other end vertically extends toward the upper box body (1) and is provided with a clamping block (61). The cable storage turntable (2) is sleeved on the rotating shaft, and the axial movement of the cable storage turntable (2) is limited by the clamping block (61).

8. The optical fiber distribution box for storing tail cables according to claim 1, characterized in that: A receiving groove (13) is provided at one end of the bottom plate of the upper box body (1) facing the lower box body (3), and the receiving groove (13) is used to receive a portion of the tail cable connected to the first adapter (10), and the tail cable is used to pass through the receiving groove (13) and be connected to the first adapter (10).

9. The optical fiber distribution box for storing tail cables according to claim 1, characterized in that: The upper box body (1) is rotatably connected to the lower box body (3), and / or the upper box body (1) is connected to the lower box body (3) via a buckle.

10. The optical fiber distribution box for storing tail cables according to claim 1, characterized in that: A cable outlet is provided on the side wall of the lower box body (3), and a cable outlet sealing ring (31) is provided at the cable outlet.

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