Biological invasion prevention device

By designing an adjustable isolation net and tightening components, the problem that existing rodent and insect prevention devices cannot adapt to cables of different diameters has been solved, achieving effective protection for cables of different diameters and improving the applicability and flexibility of the device.

CN223713527UActive Publication Date: 2025-12-23长江三峡(海南)绿色发展投资有限公司
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Patent Information

Application Number
CN202423220741.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-12-23
Estimated Expiration
2034-12-25

AI Technical Summary

Technical Problem

Existing rodent and insect prevention devices cannot adjust the size of the cable tie, making them unsuitable for cables of different diameters and reducing their applicability.

Method used

A biological intrusion prevention device was designed, comprising a mounting plate, a barrier net, and a tightening assembly. The adjustable barrier net and tightening assembly are used to accommodate cables of different diameters, and the tightening and adjustment of the cable opening are achieved by using a limiting connection hole and a hinged shaft tube.

Benefits of technology

It enables effective tightening of cables of different diameters, improving the applicability of protection, and the number of limit rings can be adjusted through a detachable connection, enhancing the flexibility and adaptability of the device.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a biological invasion prevention device, which relates to the technical field of line protection and comprises a mounting plate, a separation net and a tightening component for tightening a binding opening of the separation net, and the separation net is arranged on the mounting plate in an opening and closing manner; a triangular opening is formed in the isolation net, a plurality of limiting connecting holes are uniformly formed in the two sides of the triangular opening, and the tightening assembly tightens the triangular opening through the limiting connecting holes, so that the bundling opening of the isolation net is tightened to sleeve the cable; the tightening assembly is connected with the limiting connecting holes in different positions in a penetrating mode so that cables of different diameters can be tightly sleeved. According to the invention, the adjustable isolation net is arranged, and the opening of the isolation net is tightened through the tightening assembly, so that cables with different diameters can be tightly sleeved and isolated, and the applicability of the device is effectively improved. And meanwhile, by arranging the openable and closable annular structure mounting plate, the biological invasion prevention device can be opened to sleeve the cable, and the closed mounting plate is pre-tightened by rotating the rotating ring.
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Description

TECHNICAL FIELD

[0001] The utility model relates to line protection technical field, concretely relates to a biological invasion prevention device. BACKGROUND

[0002] With the development of economy and society, various facilities and equipment will have preset threading holes during construction and installation, which is convenient for cable access, but also provides convenience for rodents, snakes, cockroaches and the like to enter human activity areas. Especially in the electrical field, biological invasion often leads to short circuit of facilities and equipment or even fire, which causes economic losses and brings great safety hazards. In order to prevent rodents, snakes and cockroaches from invading equipment and indoor, the prior art discloses a rat and insect prevention device with the patent number CN201520631155.5, which comprises a first through hole for connecting with a cable outside a box body and a rubber sealing ring matched with the first through hole, the rubber sealing ring is provided with a second through hole matched with the cable; a detachable fixing support is arranged in the box body; a detachable baffle for fixing the rubber sealing ring is arranged on the support; the rubber sealing ring is arranged, which effectively blocks the hole of the wiring port, has good rat and insect prevention effect, and is not easy to cause extrusion damage to the cable, and at the same time, has strong applicability to holes of different sizes.

[0003] However, the above-mentioned rat and insect prevention device cannot protect cables of different diameters, that is, the mouth of the rat and insect prevention device cannot be adjusted according to the size of the cable, so the applicability is reduced, therefore, the present application provides a biological invasion prevention device with higher applicability. UTILITY MODEL CONTENTS

[0004] The utility model aims at the deficiencies in the above-mentioned technology, and provides a biological invasion prevention device, which aims to solve the problem that the above-mentioned rat and insect prevention device cannot adjust the size of the mouth to protect cables of different diameters.

[0005] The utility model provides a biological invasion prevention device, which comprises a mounting plate, a separation net and a tightening assembly for tightening the mouth of the separation net, the separation net is opened and closed on the mounting plate; the separation net is provided with a triangular opening, a plurality of limiting connection holes are uniformly arranged on the two sides of the triangular opening, the tightening assembly is connected to the triangular opening through the limiting connection holes to tighten the mouth of the separation net on the cable; the tightening assembly is connected to the limiting connection holes at different positions to tighten the cable of different diameters.

[0006] The outer ring of the mounting plate is provided with an annular clamping groove, and the mounting plate is provided with a plurality of mounting holes.

[0007] Preferably, the mounting plate is in a ring structure, the mounting plate comprises mounting plate one and mounting plate two in a semi-circular structure, one end of the mounting plate one and one end of the mounting plate two are hinged to enable the mounting plate to be opened and closed on the cable. The application also comprises a rotatable ring which can be opened and closed, the upper part of the isolation net is fixedly connected with the rotatable ring, the triangular opening is located on the opening and closing side of the rotatable ring, and the rotatable ring is rotatably arranged in the mounting plate.

[0008] The application is provided with a ring-shaped limiting groove in the mounting plate, a limiting protrusion is arranged in the ring-shaped limiting groove, a limiting groove is arranged on the lower end surface of the rotatable ring, and the rotatable ring is rotatably connected with the limiting protrusion through the limiting groove to enable the rotatable ring to be rotatably arranged in the ring-shaped limiting groove.

[0009] Preferably, the tightening assembly of the application comprises a plurality of limiting rings which are connected with the limiting connection holes. The tightening assembly further comprises a hinged shaft pipe for connecting with the plurality of limiting rings, the hinged shaft pipe is provided with a pressing part, the pressing part is used to press and synchronously open the limiting rings to be sleeved into the limiting connection holes. The hinged shaft pipe comprises a main hinged shaft pipe and a secondary hinged shaft pipe, the main hinged shaft pipe comprises a main hinged shaft and a main hinged pipe, the main hinged pipe is rotatably sleeved on the main hinged shaft, the secondary hinged shaft pipe comprises a secondary hinged shaft and a secondary hinged pipe, the secondary hinged pipe is rotatably sleeved on the secondary hinged shaft; the limiting ring is composed of an arc-shaped rod one and an arc-shaped rod two, the arc-shaped rod one is fixedly arranged on the main hinged shaft and the secondary hinged shaft, and the arc-shaped rod two is fixedly arranged on the main hinged pipe and the secondary hinged pipe; the pressing part is arranged on the main hinged shaft and the main hinged pipe respectively; the secondary hinged shaft is detachably connected with the end part of the main hinged shaft.

[0010] The main hinged pipe and the secondary hinged pipe of the application are provided with arc-shaped through holes, and the arc-shaped rod two is located in the arc-shaped through holes; the main hinged pipe is further provided with a ring-shaped groove, a semi-circular through hole is arranged in the ring-shaped groove, a torsional spring is sleeved in the ring-shaped groove, one end of the torsional spring passes through the semi-circular through hole and is fixedly connected with the main hinged shaft, and the other end of the torsional spring is fixedly connected with the end wall of the ring-shaped groove.

[0011] One end of the secondary hinged shaft of the application is provided with a connecting screw rod, the end part of the main hinged shaft and the other end of the secondary hinged shaft are provided with screw holes which are threadedly connected with the connecting screw rod; one end of the secondary hinged pipe is provided with a plug-in recess, and the end part of the main hinged pipe and the other end of the secondary hinged pipe are provided with plug-in protrusions which are plugged with the plug-in recess.

[0012] Preferably, as an alternative, a connecting rod is rotatably arranged in the secondary hinged shaft, one end of the connecting rod is provided with an external thread, the external thread is located at the outer end of the secondary hinged shaft, and the connecting rod is connected with the screw hole on the main hinged shaft through the external thread.

[0013] Compared with the prior art, the application has the following beneficial effects:

[0014] 1. The application sets an adjustable isolation net, and relies on the tightening assembly to tighten the isolation net, so as to tighten the isolation of cables with different diameters, effectively improving the applicability.

[0015] 2. The application sets an openable ring-shaped structure mounting plate, so that the biological invasion prevention device can be opened and sleeved on the cable, and the pre-tightening of the closed mounting plate is realized by rotating the swivel.

[0016] 3. The application sets a main hinge shaft pipe and a secondary hinge shaft pipe, so that the pressing part on the main hinge shaft pipe can control the synchronous opening and closing of multiple limiting rings; and relying on the detachable connection, the secondary hinge shaft pipe can be connected with the main hinge shaft pipe according to the diameter of the cable to increase the number of limiting rings; the detachable connection of the secondary hinge shaft pipe can realize the adjustment of the connection number of the limiting ring. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only preferred embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0018] Figure 1 It is a plane opening schematic diagram of the biological invasion prevention device of the application;

[0019] Figure 2 It is a plane tightening schematic diagram of the biological invasion prevention device of the application;

[0020] Figure 3 It is a schematic diagram of the biological invasion prevention device sleeved on the cable of the application;

[0021] Figure 4 It is a structural schematic diagram of the biological invasion prevention device of the application;

[0022] Figure 5 It is a schematic diagram of the mounting plate of the application;

[0023] Figure 6 It is a schematic diagram of the swivel and the tightening isolation net of the application;

[0024] Figure 7 It is a schematic diagram of the tightening assembly and the isolation net of the application;

[0025] Figure 8 It is a schematic diagram of the tightening assembly of the application;

[0026] Figure 9It is the schematic view of the tightening assembly of the utility model;

[0027] Figure 10 It is the schematic view of the tightening assembly of the utility model;

[0028] Figure 11 It is the schematic view of the auxiliary hinge shaft pipe of the utility model;

[0029] Figure 12 It is the schematic view of another embodiment of the hinge shaft pipe of the utility model.

[0030] In the figure, 1 - mounting plate, 11 - mounting plate one, 12 - mounting plate two, 13 - annular clamping groove, 14 - mounting hole, 15 - annular limiting groove, 16 - limiting protrusion;

[0031] 2 - isolation net, 21 - triangular opening, 22 - limiting connecting hole;

[0032] 3 - tightening assembly, 31 - limiting ring, 311 - arc-shaped rod one, 312 - arc-shaped rod two, 32 - hinge shaft pipe, 321 - main hinge pipe shaft, 3211 - main hinge shaft, 3212 - main hinge pipe, 3213 - annular groove, 3214 - semicircular through hole, 3215 - threaded hole, 3216 - plug-in protrusion, 322 - auxiliary hinge shaft pipe, 3221 - auxiliary hinge shaft, 3222 - auxiliary hinge pipe, 3223 - arc-shaped through hole, 3224 - connecting screw rod, 3225 - plug-in recess, 33 - pressing part, 34 - torsional spring;

[0033] 4 - swivel, 41 - limiting recess, 5 - connecting rod. DETAILED DESCRIPTION

[0034] In order to more easily understand the structure of the utility model and the function characteristics and advantages that can be achieved, the preferred embodiments of the utility model are described in detail below, and the drawings are as follows:

[0035] Embodiment one:

[0036] As shown in Figure 1 and Figure 2 The utility model provides a kind of biological intrusion prevention device, including mounting plate 1, isolation net 2 and be used for tightening isolation net 2 bundle mouth's tightening assembly 3, isolation net 2 is opened and closed on mounting plate 1;Isolation net 2 is bucket-shaped structure, isolation net 2 is provided with triangular opening 21, multiple limiting connecting holes 22 are evenly provided on the two sides of triangular opening 21, and tightening assembly 3 is tightened by limiting connecting hole 22 to triangular opening 21, so that the bundle mouth of isolation net 2 is tightened and is sleeved on cable;Tightening assembly 3 is connected by limiting connecting hole 22 in different positions, to be tightly sleeved on cable of different diameters, effectively improve its applicability.

[0037] The outer ring of the mounting plate 1 is provided with an annular clamping groove 13, which can be clamped on the equipment cabinet or the plate hole. The mounting plate 1 is provided with a plurality of mounting holes 14, so as to fix the mounting plate 1 to the wall or the plate surface through the mounting holes 14, and the connection mode can adopt screw or bolt connection mode.

[0038] Embodiment two:

[0039] As shown in Figure 5 and Figure 6 , the mounting plate 1 of the embodiment is of annular structure, and the mounting plate 1 comprises mounting plate one 11 and mounting plate two 12 of semicircular structure, one end of the mounting plate one 11 and one end of the mounting plate two 12 are hinged, so that the mounting plate 1 can be opened and closed on the cable. The application also comprises an openable and closable swivel ring 4, the upper part of the isolation net 2 is fixedly connected with the swivel ring 4; the triangular opening 21 is located on the opening and closing side of the swivel ring 4; the swivel ring 4 is rotatably arranged in the mounting plate 1. By setting the swivel ring 4, the opening and closing side of the swivel ring 4 is switched by rotating the swivel ring 4, and the opening and closing side of the swivel ring 4 is misaligned with the mounting plate 1, so as to realize the pre-tightening of the closed mounting plate 1.

[0040] As shown in Figure 5 , the mounting plate 1 is provided with an annular limiting groove 15, the annular limiting groove 15 is provided with a limiting protrusion 16, the lower end surface of the swivel ring 4 is provided with a limiting groove 41, and the swivel ring 4 is rotatably connected with the limiting protrusion 16 through the limiting groove 41, so that the swivel ring 4 is rotatably arranged in the annular limiting groove 15; when the opening and closing line on the swivel ring 4 is rotated to the opening and closing line of the mounting plate one 11 and the mounting plate two 12, the mounting plate 1 can be opened; further, the swivel ring 4 is composed of two semicircular rings, the two ends thereof are in a disconnected state, the isolation net 2 is used to connect one end of the two semicircular rings, and the other end can be opened and closed, so as to adjust the size of the opening of the isolation net 2 after the limiting ring 31 is connected with the limiting hole thereon. Further, the isolation net 2 is a net with certain deformation capacity, so that the isolation net 2 can be opened to be sleeved on the cable when the mounting plate 1 is opened, and the triangular opening 21 can be tightened by the limiting ring 31.

[0041] Embodiment three:

[0042] As shown in FIG. 7 and Figure 11As shown, the tightening assembly 3 of the present application of the present embodiment comprises a plurality of limiting rings 31 which are penetrated with the limiting connection holes 22. The tightening assembly 3 further comprises a hinged shaft tube 32 for connecting with the plurality of limiting rings 31, the hinged shaft tube 32 is provided with a pressing part 33, the pressing part 33 is used to synchronously open the limiting rings 31 by pressing to be sleeved into the limiting connection holes 22. The hinged shaft tube 32 comprises a main hinged shaft 3211 tube 32 and a secondary hinged shaft tube 322, the main hinged shaft 3211 tube 32 comprises a main hinged shaft 3211 and a main hinged tube 3212, the main hinged tube 3212 is rotatably sleeved on the main hinged shaft 3211, the secondary hinged shaft tube 322 comprises a secondary hinged shaft 3221 and a secondary hinged tube 3222, the secondary hinged tube 3222 is rotatably sleeved on the secondary hinged shaft 3221; the limiting ring 31 is composed of an arc-shaped rod one 311 and an arc-shaped rod two 312, the arc-shaped rod one 311 is fixedly arranged on the main hinged shaft 3211 and the secondary hinged shaft 3221, the arc-shaped rod two 312 is fixedly arranged on the main hinged tube 3212 and the secondary hinged tube 3222; the pressing part 33 is arranged on the main hinged shaft 3211 and the main hinged tube 3212 respectively; the secondary hinged shaft 3221 is detachably connected with the end of the main hinged shaft 3211.

[0043] Referring to Figure 9 , the main hinged tube 3212 and the secondary hinged tube 3222 of the present application are provided with an arc-shaped through hole 3223, the arc-shaped rod two 312 is located in the arc-shaped through hole 3223; the main hinged tube 3212 is further provided with an annular groove 3213, a semicircular through hole 3214 is arranged in the annular groove 3213, a torsion spring 34 is sleeved in the annular groove 3213, one end of the torsion spring 34 penetrates through the semicircular through hole 3214 and is fixedly connected with the main hinged shaft 3211, the other end of the torsion spring 34 is fixedly connected with the end wall of the annular groove 3213; further, the torsion spring 34 is two groups, which are arranged on the two sides of the pressing part 33, so as to realize the automatic closing of the limiting ring 31 by arranging the torsion spring 34.

[0044] Referring to Figure 11 , one end of the secondary hinged shaft 3221 is provided with a connecting screw rod 3224, the end of the main hinged shaft 3211 and the other end of the secondary hinged shaft 3221 are provided with a threaded hole 3215 which is threadedly connected with the connecting screw rod 3224. The rotation direction of the connecting screw rod 3224 and the threaded hole 3215 after being connected and screwed is consistent with the pressing rotation direction of the pressing part 33 connected with the main hinged shaft 3211, so as to prevent the relative rotation loosening of the threaded hole 3215 of the connecting screw rod 3224 and the main hinged shaft 3211 or the secondary hinged shaft 3221 end when the pressing part 33 is pressed.

[0045] Referring to Figure 9 and Figure 11The one end of the secondary hinged pipe 3222 is provided with a plug-in groove 3225, the end of the primary hinged pipe 3212 and the other end of the secondary hinged pipe 3222 are provided with plug-in protrusions 3216 which are plugged into the plug-in groove 3225, so that the connection between the primary hinged pipe 3212 and the secondary hinged pipe 3222 is realized by setting the plug-in groove 3225 and the plug-in protrusion 3216, so that when the pressing part 33 is pressed, the primary hinged pipe 3212 can be rotated, and at the same time, the secondary hinged pipe 3222 is rotated, so as to realize the simultaneous opening and closing of the plurality of limiting rings 31. The number of limiting rings 31 is increased and decreased by the detachable connection, and the opening and closing of the plurality of limiting rings 31 are simultaneously controlled by the pressing part 33 and the primary hinged pipe 3212 and the secondary hinged pipe 3222. Further, the plug-in protrusion 3216 and the plug-in groove 3225 are both composed of two annular semicircular structures, and the vertical section of the plug-in protrusion 3216 and the plug-in groove 3225 is a trapezoidal structure, so as to limit the swivel ring 4 in the mounting plate 1.

[0046] When the secondary hinged pipe 322 needs to be installed, the arc-shaped rod two 312 is first rotated to the other end in the arc-shaped through hole 3223, and then the connecting screw rod 3224 is connected with the threaded hole 3215 at the end of the primary hinged shaft 3211 or the secondary hinged shaft 3221, and when the plug-in groove 3225 on the secondary hinged pipe is horizontally opposite to the plug-in protrusion 3216, the secondary hinged shaft 3221 is rotated by the arc-shaped rod two 312, and the arc-shaped rod two 312 is held tightly, so that the arc-shaped rod two 312 is rotated from one end of the arc-shaped hole to the other end, and in this process, the secondary hinged pipe 3222 moves linearly to make the plug-in groove 3225 and the plug-in protrusion 3216 plug-in, so as to realize the connection between the secondary hinged pipe 3222 and the primary hinged pipe 3212, so that when the pressing part 33 is pressed, the secondary hinged pipe 3222 can be rotated synchronously through the primary hinged pipe 3212, so as to realize the simultaneous control of the plurality of limiting rings 31.

[0047] Embodiment four:

[0048] As shown in Figure 12 As an alternative, the connecting rod 5 is arranged by rotating in the secondary hinged shaft 3221, one end of the connecting rod 5 is provided with an external thread, the external thread is located at the outer end of the secondary hinged shaft 3221, and the connecting rod 5 is connected with the threaded hole 3215 on the primary hinged shaft 3211 through the external thread.

[0049] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any person skilled in the art, without departing from the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application by using the above technical content, or modify it into equivalent embodiments with equivalent changes. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical content of the present application, without departing from the technical scheme of the present application, all belong to the protection scope of the present technical scheme.

Claims

1. A device for preventing biological intrusion, characterized in that, The utility model provides a cable isolation device, including installation board (1), isolation net (2) and be used for tightening the tightening assembly (3) of the bundle mouth of isolation net (2), isolation net (2) is opened and closed on installation board (1), isolation net (2) is provided with triangular opening (21), both sides of triangular opening (21) are provided with a plurality of limit connecting hole (22), and the tightening assembly (3) is tightened triangular opening (21) through limit connecting hole (22), makes the bundle mouth of isolation net (2) and is tightly sleeved on cable, and the tightening assembly (3) is through the interlinking of limit connecting hole (22) in different positions, and the cable of different diameter is tightly sleeved.

2. The device of claim 1, wherein, The installation board (1) is annular structure, the installation board (1) includes semicircular structure installation board one (11) and installation board two (12), one end of installation board one (11) and one end of installation board two (12) are hinged, so that the installation board (1) can be opened and closed and sleeved on the cable.

3. The device of claim 2, wherein, It also includes a rotatable ring (4) that can be opened and closed, the upper part of the isolation net (2) is fixedly connected with the rotatable ring (4), the triangular opening (21) is located on the opening and closing side of the rotatable ring (4), and the rotatable ring (4) is rotatably arranged in the installation board (1).

4. The device of claim 1, wherein, The tightening assembly (3) includes a plurality of limiting rings (31), and the limiting rings (31) are interlinked with the limiting connecting holes (22).

5. The device of claim 4, wherein the device is configured to be attached to a surface of the structure. The tightening assembly (3) further includes a hinged shaft tube (32) for connecting the plurality of limiting rings (31), and a pressing portion (33) is arranged on the hinged shaft tube (32), and the pressing portion (33) is pressed to synchronously open the limiting rings (31) and be sleeved into the limiting connecting holes (22).

6. The device of claim 5, wherein, The hinged shaft tube (32) includes a main hinged shaft (3211) tube (32) and a secondary hinged shaft tube (322), the main hinged shaft (3211) tube (32) includes a main hinged shaft (3211) and a main hinged tube (3212), the main hinged tube (3212) is rotatably sleeved on the main hinged shaft (3211), the secondary hinged shaft tube (322) includes a secondary hinged shaft (3221) and a secondary hinged tube (3222), and the secondary hinged tube (3222) is rotatably sleeved on the secondary hinged shaft (3221); the limiting rings (31) are composed of an arc-shaped rod one (311) and an arc-shaped rod two (312), the arc-shaped rod one (311) is fixedly arranged on the main hinged shaft (3211) and the secondary hinged shaft (3221), the arc-shaped rod two (312) is fixedly arranged on the main hinged tube (3212) and the secondary hinged tube (3222), the pressing portion (33) is arranged on the main hinged shaft (3211) and the main hinged tube (3212) respectively, and the secondary hinged shaft (3221) is detachably connected with the end portion of the main hinged shaft (3211).

7. The device of claim 6, wherein, The main hinged pipe (3212) and the secondary hinged pipe (3222) are provided with arc-shaped through holes (3223), and the arc-shaped rod (312) is located in the arc-shaped through holes (3223); the main hinged pipe (3212) is further provided with an annular groove (3213), the annular groove (3213) is provided with a semicircular through hole (3214), and the annular groove (3213) is sleeved with a torsional spring (34), one end of the torsional spring (34) is fixedly connected with the main hinged shaft (3211) through the semicircular through hole (3214), and the other end of the torsional spring (34) is fixedly connected with the end wall of the annular groove (3213).

8. The device of claim 7, wherein, One end of the secondary hinged shaft (3221) is provided with a connecting screw rod (3224), the end of the main hinged shaft (3211) and the other end of the secondary hinged shaft (3221) are provided with threaded holes (3215) which are threadedly connected with the connecting screw rod (3224); one end of the secondary hinged pipe (3222) is provided with a plug-in groove (3225), and the end of the main hinged pipe (3212) and the other end of the secondary hinged pipe (3222) are provided with plug-in protrusions (3216) which are plugged with the plug-in groove (3225).

9. The device of claim 1, wherein, The outer ring of the mounting plate (1) is provided with an annular clamping groove (13), and the upper portion of the mounting plate (1) is provided with a plurality of mounting holes (14).

10. The device of claim 3, wherein, The mounting plate (1) is provided with an annular limiting groove (15), the annular limiting groove (15) is provided with a limiting protrusion (16), the lower end surface of the rotating ring (4) is provided with a limiting groove (41), and the rotating ring (4) is rotationally connected with the limiting protrusion (16) through the limiting groove (41), so that the rotating ring (4) is rotationally located in the annular limiting groove (15).

Citation Information

Patent Citations

  • Protection against rodents protection against insects device

    CN204860781U