Range finder

By installing magnetic reinforcement on the main body of the rangefinder, the magnetic attraction on the magnet and protective sleeve is enhanced, and the problem of easy dropping of the rangefinder and poor magnetic absorption is solved, achieving more stable assembly and convenient portability and storage.

CN222652215UActive Publication Date: 2025-03-21SHENZHEN MILESEEY TECH
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202421094018.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-17
Publication Date
2025-03-21
Estimated Expiration
2034-05-17

AI Technical Summary

Technical Problem

The existing rangefinders are easily dropped during use and are inconvenient to store and carry, and the magnetic suction assembly method causes the magnetic attraction to be weak and easy to dislocation.

Method used

By providing a magnetic reinforcement on the main body of the rangefinder, the magnetic attraction between the magnet and the magnetic object on the protective sleeve is enhanced, thereby improving the stability of the assembly and preventing dislocation.

Benefits of technology

The magnetic attraction between the rangefinder body and the protective sleeve is enhanced, the assembly stability is improved, dislocation is prevented, and it is easy to carry and store.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222652215U_ABST
    Figure CN222652215U_ABST
Patent Text Reader

Abstract

The utility model discloses a range finder, which comprises a protective sleeve; the range finder main body is suitable for being assembled on the protective sleeve; the magnet is arranged on the range finder main body, the magnet is arranged close to the protective sleeve, and a magnetic object is arranged on the protective sleeve so as to magnetically attract the magnet; the range finder comprises a protective sleeve, a magnet and a magnetic force enhancing part, one surface, deviating from the protective sleeve, of the magnet is a first surface, and the magnetic force enhancing part wraps the first surface so as to enhance the magnetic attraction force between the magnet and the magnetic object. Therefore, the range finder and the protective sleeve are assembled more stably, and dislocation is prevented.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The present application relates to the field of measuring instruments, and in particular to a distance meter. Background Art

[0002] A rangefinder is an instrument that accurately measures the distance to a target by modulating a certain parameter of a laser. When working, the rangefinder emits a very thin beam of laser to the target. The laser beam reflected by the target is received by a photoelectric element, and a timer measures the time from the emission to the reception of the laser beam, thereby calculating the distance from the observer to the target.

[0003] Most of the existing rangefinders are designed with a single shell including internal components, and lack a protective cover. If accidentally dropped during use, the rangefinder may be seriously damaged. The reliability is poor, and it is not convenient to store and carry when not in use. A few rangefinders are provided with a protective cover, in which the rangefinder body and the protective cover are assembled by magnetic attraction. However, since the space left for the magnet inside the rangefinder body is small, the magnetic attraction of the magnet is not strong, and the rangefinder body and the protective cover are easily dislocated. Utility Model Content

[0004] Based on this, the problem solved by the present application is how to enhance the magnetic attraction by changing the strength of the magnetic force of the magnet of the rangefinder body.

[0005] The utility model provides a distance meter, comprising:

[0006] Protective case;

[0007] The rangefinder body is suitable for being assembled on the protective cover;

[0008] A magnet is arranged on the rangefinder body, the magnet is arranged close to the protective cover, and a magnetic object is arranged on the protective cover to be magnetically attracted to the magnet;

[0009] A magnetic force enhancement component, wherein the side of the magnet facing away from the protective cover is a first side, and the magnetic force enhancement component is arranged to wrap the first side to enhance the magnetic attraction between the magnet and the magnetic object.

[0010] In one of the embodiments, a groove is provided on the magnetic enhancement member, the groove is arranged toward the opening of the protective cover, the magnet is accommodated in the groove, the magnet also includes a circumferential side surface, and the groove wraps around the first surface and the circumferential side surface of the magnet.

[0011] In one embodiment, the groove includes an inner side wall, and at least a portion of the inner side wall is configured as a curved surface.

[0012] In one of the embodiments, the magnetic enhancement component is arranged in the rangefinder body, and the rangefinder body includes a shell and a bottom shell. The shell is provided with an opening on the side facing the protective cover, the magnetic enhancement component is embedded in the opening, and the bottom shell is sleeved on the opening.

[0013] In one embodiment, the protective cover comprises a protective cover body, and the protective cover body is opened on one side facing the rangefinder body to accommodate the rangefinder body.

[0014] In one embodiment, the protective cover body is semi-open.

[0015] In one of the embodiments, a receiving groove is provided on the protective cover body, and the magnetic object is received in the receiving groove.

[0016] In one embodiment, the protective cover body includes a stacked box body and an isolation layer, the isolation layer is arranged between the box body and the rangefinder body, the isolation layer is made of sound-absorbing and anti-collision materials, and the sound-absorbing and anti-collision materials include silicone, rubber, sound-absorbing cotton or foam plastic.

[0017] In one of the embodiments, it also includes a hanging structure, which is arranged on the side of the protective cover body away from the rangefinder body, and the hanging structure includes a connecting section and a back clamp section, the connecting section is connected to the protective cover body, and the back clamp section is bent back relative to the connecting section to form a gap between the back clamp section and the connecting section for hanging.

[0018] In one of the embodiments, a sliding groove is provided on the protective cover body, and the connecting section is detachably slidably provided in the sliding groove. A protrusion is also provided on the sliding groove, and a slot is provided on the connecting section. When in an assembled state, the slot is clamped on the protrusion.

[0019] Based on the above description, the magnet is arranged on the rangefinder body, and the magnet is arranged close to the protective cover so as to be magnetically attracted to the magnetic object on the protective cover. The side of the magnet facing the protective cover for magnetic attraction is called the first side, and the side of the magnet facing away from the protective cover is called the second side. The magnetic force enhancement member is arranged to wrap the second side, so as to shield the magnetism of the second side, and then refract the magnetism of the second side to the first side, so that the magnetic force of the first side of the magnet is enhanced, thereby enhancing the magnetic attraction between the magnet and the magnetic object without changing the size of the magnet, making the assembly between the rangefinder body and the protective cover more stable and preventing dislocation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A schematic diagram of the structure of a rangefinder provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the assembly structure of the rangefinder provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the structure of the rangefinder body provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of a partial exploded structure of a rangefinder body provided in an embodiment of the present application;

[0024] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0025] Figure 6 This is one of the exploded structural schematic diagrams of the protective cover provided in the embodiment of the present application;

[0026] Figure 7 The second schematic diagram of the explosion structure of the protective cover provided in the embodiment of the present application;

[0027] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at point B in the middle.

[0028] The reference numerals in the embodiments of the present application are described as follows:

[0029] 1-rangefinder body; 2-protective cover; 111-shell; 1111-opening; 1112-side of the shell facing the protective cover; 112-bottom shell; 113-top shell; 121-second side; 122-one side; 123-first side; 124-axial side; 131-groove; 132-connecting column; 1311-bottom of the groove; 1312-inner side wall; 1313-hole; 12-magnet; 13-magnetic reinforcement member; 14-lens; 15-one end ;21-protective cover body;22-magnetic object;23-suspension structure;24-fastener;211-accommodating groove;212-box body;213-isolating layer;214-one side;215-sliding groove;216-bottom shell;217-accommodating part;218-protruding part;2171-two ends;2151-side strip;2152-plywood;2153-protrusion;231-connecting section;232-back clamp section;233-gap;234-slot. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0034] The utility model is described in detail below in conjunction with the accompanying drawings.

[0035] In order to solve the above technical problems, combined Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, an embodiment of the present application provides a rangefinder, comprising:

[0036] Protective cover 2;

[0037] The rangefinder body 1 is suitable for being assembled on the protective cover 2;

[0038] A magnet 12 is disposed on the rangefinder body 1, the magnet 12 is disposed close to the protective cover 2, and a magnetic object 22 is disposed on the protective cover 2 to be magnetically attracted to the magnet 12;

[0039] The magnetic reinforcement member 13 , a side 122 of the magnet 12 facing away from the protective cover 2 is a first side 123 , and the magnetic reinforcement member 13 is arranged to wrap the first side 123 to enhance the magnetic attraction between the magnet 12 and the magnetic object 22 .

[0040] It should be noted that the magnet 12 is arranged on the rangefinder body 1, and the magnet 12 is arranged close to the protective cover 2 so as to be magnetically attracted to the magnetic object 22 on the protective cover 2. The magnet 12 is generally arranged with two poles, but a magnet 12 with a single pole is required in some working positions, so it is necessary to wrap one side of the magnet 12 with an iron sheet so that the magnetism of the side wrapped by the iron sheet is shielded, and the magnetic force is refracted to the other side of the magnet 12 through the iron sheet, so that the magnetic force of the magnet 12 on the other side is enhanced. Such magnets 12 are collectively referred to as single-sided magnets or single-sided magnets, and the principle of single-sided magnets is used in this application, and the side 122 of the magnet 12 facing away from the protective cover 2 is called the first side 123, and the side 123 of the magnet 12 facing the protective cover 2 is called the first side 123. The side that performs magnetic attraction is called the second side 121. The magnetic force enhancement member 13 is arranged to wrap the first side 123, so as to shield the magnetism of the first side 123, and then refract the magnetic force of the first side 123 to the second side 121, so that the magnetic force of the second side 121 of the magnet 12 is enhanced, thereby enhancing the magnetic attraction between the magnet 12 and the magnetic object 22 without changing the size of the magnet 12, so that the assembly between the rangefinder body 1 and the protective cover 2 is more stable and prevented from dislocation.

[0041] In one embodiment of the present invention, Figure 4 As shown, a groove 131 is provided on the magnetic reinforcement member 13, and the groove 131 is opened toward the protective cover 2. The magnet 12 is accommodated in the groove 131. The magnet 12 also includes a circumferential side surface 124. The groove 131 wraps around the first surface 123 and the circumferential side surface 124 of the magnet 12.

[0042] It should be noted that the groove 131 is set to be open toward the protective cover 2, and the magnet 12 is accommodated in the groove 131, so that the groove 131 wraps the first surface 123 and the circumferential side surface 124 of the magnet 12 to magnetically shield the first surface 123 and the circumferential side surface 124 of the magnet 12, and only the second surface 121 of the magnet 12 is exposed to magnetically attract the magnetic object 22. The magnetic force of the first surface 123 and the circumferential side surface 124 of the magnet 12 will be refracted to the second surface 121, thereby further enhancing the magnetic attraction between the magnet 12 and the magnetic object 22.

[0043] In one embodiment of the present invention, Figure 5 As shown, the groove 131 includes an inner wall 1312 , and at least a portion of the inner wall 1312 is configured as a curved surface.

[0044] It should be noted that at least a portion of the inner wall 1312 of the groove 131 is set as a curved surface. Due to the good refraction effect of the curved surface, the magnetic attraction of the magnet 12 can be further enhanced. Preferably, the groove 131 can be set as a rounded rectangular groove, a waisted round groove, an elliptical groove or a circular groove, wherein the magnet 12 is adaptively set to a rounded rectangular sheet magnet 12, a waisted round sheet magnet 12, an elliptical sheet magnet 12 and a circular sheet magnet 12 to be accommodated in the groove 131. In addition, a certain gap can be set between the magnet 12 and the inner wall 1312 of the groove 131 to facilitate magnetic refraction.

[0045] In addition, a hole 1313 is provided at the bottom 1311 of the groove 131. Preferably, the magnetic reinforcement member 13 is made of iron, and the magnet 12 is adsorbed in the groove 131 of the magnetic reinforcement member 13. When the gap between the magnet 12 and the groove 131 is small, it is not easy to remove the magnet 12, so a hole 1313 is opened at the bottom 1311 of the groove 131, so that it is convenient to use a tool to penetrate the hole 1313 and push out the magnet 12. The setting of the hole 1313 also makes room for the components located inside the rangefinder body 1, which is convenient for the assembly of components.

[0046] In one embodiment of the present invention, Figure 3 , Figure 4 and Figure 5 As shown, the magnetic reinforcement component 13 is arranged in the rangefinder body 1, and the rangefinder body 1 includes a shell 111 and a bottom shell 112. The shell 111 is provided with an opening 1111 on one side 1112 facing the protective cover 2. The magnetic reinforcement component 13 is embedded in the opening 1111, and the bottom shell 112 is sleeved on the opening 1111.

[0047] It should be noted that the rangefinder body 1 also includes a top shell 113, and a accommodating cavity is provided in the shell 111, and the above-mentioned components and the magnetic enhancement component 13 are accommodated in the accommodating cavity, wherein the magnetic enhancement component 13 is connected to the components through a connecting column 132 so as to be installed in the accommodating cavity, and an opening 1111 is provided on a side 1112 of the shell 111 facing the protective cover 2, and the magnetic enhancement component 13 is embedded in the opening 1111, so that the second side 121 of the magnet 12 can be exposed, and the top shell 113 and the bottom shell 112 are respectively diagonally mounted on the upper and lower sides of the shell 111, so that while forming a unique pattern, the bottom shell 112 wraps the second side 121 of the magnet 12. The top shell 113 and the bottom shell 112 may be made of silicone material, which can protect the rangefinder body 1 . The layered design of the shell 111 and the bottom shell 112 also reduces the weakening of the magnetic force of the magnet 12 by the shell 111 and the bottom shell 112 .

[0048] In one embodiment of the present invention, Figure 1 , Figure 2 and Figure 6 As shown, the protective cover 2 includes a protective cover body 21 , and the protective cover body 21 is opened toward one side of the rangefinder body 1 to accommodate the rangefinder body 1 .

[0049] It should be noted that the protective cover body 21 is set to face the opening on one side of the rangefinder body 1, and the rangefinder body 1 and the protective cover body 21 are fixed by magnetic attraction, so that the user can place the rangefinder body 1 into the protective cover body 21 along the opening of the protective cover body 21, or quickly take the rangefinder body 1 out of the protective cover body 21, which is convenient for users to take and put.

[0050] The present application also provides a rangefinder, combined with Figure 2 As shown, the protective cover body 21 is arranged in a semi-open manner.

[0051] It should be noted that, preferably, the protective cover body 21 is semi-open, and the protective cover body 21 includes a bottom shell 216, and a receiving portion 217 and two protrusions 218 arranged on the bottom shell 216. The receiving portion 217 and the two protrusions 218 are connected and arranged around the circumference of the bottom shell 216 to cooperate with the bottom shell 216 to accommodate the protective cover body 21. In the assembled state, the receiving portion 217 is arranged in a U-shaped wall shape to surround the end 15 of the rangefinder body 1 away from the lens 14. Each of the protrusions 218 is located on both sides of the rangefinder body 1 and is respectively connected to the two ends 2171 of the receiving portion 217. Each of the protruding portions 218 is configured to be a triangular wall shape protruding upward, and both ends 2171 of the accommodating portion 217 extend obliquely downward to be connected to each of the protruding portions 218, and the end of the protective cover body 1 close to the lens 14 is openly configured, so that the user can take out the rangefinder body 1 from the end of the protective cover body 21 close to the lens 14 along the length direction of the protective cover body 21 without blocking the lens 14 of the rangefinder body 1, that is, in the use state, the user can quickly take out the rangefinder body 1 for use or re-place it on the protective cover body 21 along the direction of the extended arm, thereby further facilitating the taking and placing of the rangefinder body 1.

[0052] In one embodiment of the present invention, Figure 6 As shown, the protective cover body 21 is provided with a receiving groove 211 , and the magnetic object 22 is received in the receiving groove 211 .

[0053] It should be noted that, optionally, the magnetic object 22 is an iron sheet, and a fastener 24 such as a screw is further provided to sequentially penetrate the protective cover body 21 and the iron sheet, and the iron sheet is assembled in the receiving groove 211. The iron sheet and the magnet 12 are arranged relative to each other so as to be magnetically attracted to the magnet 12. The arrangement of the receiving groove 211 allows the rangefinder body 1 and the protective cover 2 to be assembled without a gap, and the overall appearance is more beautiful and unified.

[0054] In one embodiment of the present invention, Figure 6 and Figure 7 As shown, the protective cover body 21 includes a stacked box body 212 and an isolation layer 213, the isolation layer 213 is padded between the box body 212 and the rangefinder body 1, and the isolation layer 213 is made of sound-absorbing and anti-collision materials, which include silicone, rubber, sound-absorbing cotton or foam plastic.

[0055] It should be noted that the isolation layer 213 is arranged between the box body 212 and the rangefinder body 1, and the isolation layer 213 is made of a sound-absorbing and anti-collision material to play a sound-absorbing and anti-collision function, wherein the sound-absorbing and anti-collision material is made of, for example, silicone, rubber, sound-absorbing cotton or foam plastic. It can be understood that the materials that can be arranged between the box body 212 and the rangefinder body 1 to play a sound-absorbing and anti-collision role are all within the protection scope of this application, and are not specifically limited here. The provision of the isolation layer 213 can prevent the rangefinder body 1 from colliding with the box body 212 when it is shaken or in use, thereby protecting the rangefinder body 1 and improving the user's experience.

[0056] In one embodiment of the present invention, Figure 6 , Figure 7 and Figure 8 As shown, it also includes a hanging structure 23, which is arranged on a side 214 of the protective cover body 21 away from the rangefinder body 1, and the hanging structure 23 includes a connecting section 231 and a back clamp section 232. The connecting section 231 is connected to the protective cover body 21, and the back clamp section 232 is bent back relative to the connecting section 231 to form a gap 233 between the back clamp section 232 and the connecting section 231 for hanging.

[0057] It should be noted that the hanging structure 23 is arranged on the side of the protective cover body 21 away from the rangefinder body 1, and the user can hang the rangefinder body 1 somewhere by using the hanging structure 23 to free his hands. When the user hangs the hanging structure 23 on the waist, since the protective cover body 21 adopts a semi-open design, it not only protects the rangefinder body 1, but also allows the user to quickly take out the rangefinder body 1 for use or put it back on the protective cover body 21 along the direction of the arm. The connecting section 231 and the back clip section 232 of the hanging structure 23 are both thin strip designs, so they are elastic. The connecting section 231 and the back clip section 232 are bent and folded back to form a gap 233, which is convenient for foreign objects to enter. For example, when the user hangs it on the waist, the belt buckle of the pants is inserted into the gap for hanging, and the gap 233 gradually becomes larger, so that foreign objects can be prevented from falling off after entering, thereby improving the stability of the hanging structure 23.

[0058] In one embodiment of the present invention, Figure 6 , Figure 7 and Figure 8As shown, the protective cover body 21 is provided with a sliding groove 215, and the connecting section 231 is detachably slidably provided in the sliding groove 215. The sliding groove 215 is also provided with a protrusion 2153, and the connecting section 231 is provided with a slot 234. When in an assembled state, the slot 234 is clamped on the protrusion 2153.

[0059] It should be noted that the two sides of the sliding groove 215 are provided with side strips 2151 and clamping plates 2152 in an upper and lower positional relationship along the length direction perpendicular to the rangefinder body 1, and the two sides of the connecting section 231 are respectively slidably provided between the side strips 2151 and the clamping plates 2152. In addition, the side strips 2151 can be provided in multiple numbers, and the remaining side strips 2151 are arranged in an array on the sliding groove 215 to play a guiding role. The sliding groove 215 is also provided with a protrusion 2153, and the height of the protrusion 2153 decreases in sequence along the sliding direction of the connecting section 231. The connecting section 231 is correspondingly provided with a slot 234, so that when the connecting section 231 is fully assembled in the sliding groove 215 and is in an assembled state, the slot 234 is sleeved on the protrusion 2153, and the slot 234 abuts against the highest point of the protrusion 2153 to limit the position.

[0060] It should be noted that the above-mentioned technical features are further combined with each other to form various embodiments not listed above, which are all deemed to be within the scope of the present utility model specification; and, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. A rangefinder, characterized in that: include: Protective cover (2); A rangefinder body (1) adapted to be assembled on the protective cover (2); A magnet (12) is arranged on the rangefinder body (1), the magnet (12) is arranged close to the protective cover (2), and a magnetic object (22) is arranged on the protective cover (2) to be magnetically attracted to the magnet (12); A magnetic force enhancement member (13), wherein a side (122) of the magnet (12) facing away from the protective cover (2) is a first side (123), and the magnetic force enhancement member (13) is arranged to wrap around the first side (123) to enhance the magnetic attraction between the magnet (12) and the magnetic object (22).

2. The rangefinder according to claim 1, characterized in that: The magnetic force enhancement member (13) is provided with a groove (131), the groove (131) is opened toward the protective cover (2), the magnet (12) is accommodated in the groove (131), the magnet (12) further includes a circumferential side surface (124), and the groove (131) is provided to wrap around the first surface (123) and the circumferential side surface (124) of the magnet (12).

3. The rangefinder according to claim 2, characterized in that: The groove (131) comprises an inner side wall (1312), and at least a portion of the inner side wall (1312) is configured as a curved surface.

4. The rangefinder according to claim 2, characterized in that: The magnetic force enhancement component (13) is arranged in the rangefinder body (1); the rangefinder body (1) comprises a shell (111) and a bottom shell (112); an opening (1111) is arranged on a side (1112) of the shell (111) facing the protective cover (2); the magnetic force enhancement component (13) is embedded in the opening (1111); and the bottom shell (112) is sleeved on the opening (1111).

5. The rangefinder according to claim 1, characterized in that: The protective cover (2) comprises a protective cover body (21), and the protective cover body (21) is arranged with an opening on one side facing the rangefinder body (1) so as to accommodate the rangefinder body (1).

6. The distance meter according to claim 5, characterized in that: The protective cover body (21) is arranged in a semi-open manner.

7. The rangefinder according to claim 5, characterized in that: The protective cover body (21) is provided with a receiving groove (211), and the magnetic object (22) is received in the receiving groove (211).

8. The rangefinder according to claim 5, characterized in that: The protective cover body (21) comprises a stacked box body (212) and an isolation layer (213), wherein the isolation layer (213) is arranged between the box body (212) and the rangefinder body (1), and the isolation layer (213) is made of a sound-absorbing and anti-collision material, wherein the sound-absorbing and anti-collision material is silica gel, rubber, sound-absorbing cotton or foam plastic.

9. The rangefinder according to claim 5, characterized in that: The device also comprises a suspension structure (23), the suspension structure (23) being arranged on a side (214) of the protective cover body (21) facing away from the rangefinder body (1), the suspension structure (23) comprising a connecting section (231) and a back clamp section (232), the connecting section (231) being connected to the protective cover body (21), the back clamp section (232) being bent back relative to the connecting section (231) to form a gap (233) between the back clamp section (232) and the connecting section (231) for hanging.

10. The distance meter according to claim 9, characterized in that: The protective cover body (21) is provided with a sliding groove (215), the connecting section (231) is detachably slidably arranged in the sliding groove (215), the sliding groove (215) is also provided with a protrusion (2153), and the connecting section (231) is provided with a slot (234), and when in an assembled state, the slot (234) is snapped onto the protrusion (2153).