Bird deterrent device for an electrified railway overhead line system

Abstract

The utility model relates to the technical field of electrified railway contact net protection device, and disclose a kind of bird damage prevention equipment for electrified railway contact net, including lower hoop body, the top of lower hoop body is threadedly connected with upper hoop body, the inner wall of upper hoop body is respectively provided with first slot, second slot, first sliding slot, second sliding slot and circular groove one, the design of driving component realizes the double protection of physical blocking and sound driving, and bird repelling thorn is cooperated with guide rod through guide groove two, when birds land, it can slide along it, simultaneously using the setting of first spring, arc groove and straight mouth slot, make bird repelling thorn produce sliding steering, make it increase the difficulty of bird stay, simultaneously when bird repelling thorn will drive pivot one to rotate, the meshing transmission of conical gear and umbrella gear makes turntable rotate and drives copper bell to sound, frighten birds, to further improve bird repelling effect, to effectively reduce the probability of bird damage occurrence.

Description

Technical Field

[0001] This utility model relates to the technical field of protective devices for the overhead contact system of electrified railways, specifically a bird-proof device for the overhead contact system of electrified railways. Background Technology

[0002] As the core facility for train power transmission, the safety and stability of the overhead contact system are of paramount importance. However, the frequent activity of birds in the overhead contact system area has become a prominent hidden danger to power supply safety. Birds often build nests on components such as the overhead contact system arms and insulators, and the branches, wires and other debris in the nests can easily cause short circuit faults.

[0003] Existing bird deterrent spikes are mostly fixed in shape, relying solely on physical barriers to restrict birds from staying. After long-term use, birds easily adapt, and the bird deterrent effect gradually diminishes. Their reflective bird deterrent devices rely on light reflection to deter birds, and are almost ineffective at night or in bad weather. Consequently, they are difficult to adapt to the complex and changeable climate conditions along railway lines, thus reducing their bird deterrent efficiency. Therefore, we have introduced a bird-proof device for the overhead contact system of electrified railways. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a bird-proofing device for the overhead contact system of electrified railways, which has the advantages of multiple coordinated bird-repelling functions and convenient installation and disassembly, thus solving the problems mentioned in the background technology.

[0005] This utility model provides the following technical solution: a bird-proof device for the contact wire of an electrified railway, comprising a lower hoop, an upper hoop being threadedly connected to the top of the lower hoop, the inner wall of the upper hoop being provided with a first slot, a second slot, a first sliding groove, a second sliding groove and a circular groove, a cylinder being provided at the top of the upper hoop, a guide groove being provided on the outer wall of the cylinder, a driving component being provided on the inner wall of the cylinder, a rotating shaft being rotatably sleeved on the inner wall of the cylinder, a guide rod being fixedly mounted on the inner wall of the cylinder, and a connecting component being provided on the outer wall of the cylinder;

[0006] The bird-repelling assembly includes a bird-repelling spike. A connecting column is fixedly mounted on the top of the first rotating shaft. The outer wall of the connecting column is provided with an arc-shaped groove and a straight groove. A first spring is provided on the top of the connecting column. A bevel gear is fixedly sleeved on the outer wall of the first rotating shaft. A bevel gear meshes with the outer edge of the bevel gear. A second rotating shaft is fixedly sleeved on the inner wall of the bevel gear. A turntable is fixedly sleeved on the outer wall of the second rotating shaft. A copper bell is fixedly installed on the outer wall of the turntable. A guide groove is provided on the outer wall of the bird-repelling spike.

[0007] As a preferred technical solution of this utility model: the first spring is located on the inner wall of the bird deterrent spike, with one end overlapping the bird deterrent spike and the other end overlapping the connecting post.

[0008] As a preferred technical solution of this utility model: the outer wall of the guide rod is slidably fitted to the inner wall of the guide groove 2, the bottom of the bird deterrent spike is slidably fitted to the inner wall of the arc groove and the connecting column, the arc groove and the straight groove are regarded as a set of movable components, and the number of such movable components is six sets, which are arranged in a circular array on the outer wall of the connecting column.

[0009] As a preferred technical solution of this utility model: the copper bell is regarded as a set of movable components, and the number of such movable components is four, which are arranged in a circular array on the outer wall of the turntable. The connecting component is a set of movable components, and the number of such movable components is two, which are symmetrically arranged with the cylinder as the center.

[0010] As a preferred technical solution of this utility model: the connecting component includes a guide block, the inner wall of the guide block is provided with a circular groove II, the inner wall of the circular groove II is threadedly connected with a threaded rod, the outer wall of the threaded rod is rotatably connected with a first pin, the inner wall of the first pin is provided with a circular groove III, the inner wall of the circular groove III is respectively provided with a second spring and a convex pin, the inner wall of the upper hoop is provided with a snap-fit ​​component, the snap-fit ​​component includes a second pin, the outer wall of the second pin is fixedly fitted with a slide plate, the outer wall of the slide plate is fixedly installed with a pull rod, the outer wall of the pull rod is provided with a third spring, and the outer wall of the convex pin is provided with a third slot.

[0011] As a preferred technical solution of this utility model: the outer wall of the guide block is slidably fitted to the inner wall of the guide groove one; the outer wall of the first pin is adapted to the shape of the inner wall of the first slot; the outer wall of the convex pin is adapted to the inner wall of the second slot; the top of the convex pin is slidably fitted to the inner wall of the first slot; the outer wall of the convex pin is slidably fitted to the inner wall of the circular groove three; one end of the second spring overlaps with the inner wall of the circular groove three, and the other end overlaps with the outer wall of the convex pin; the outer wall of the second pin is slidably fitted to the inner wall of the circular groove one; the outer wall of the slide plate is slidably fitted to the inner wall of the second slide groove; the third spring is located in the inner cavity of the circular groove one, and one end overlaps with the third spring, and the other end overlaps with the inner wall of the circular groove one; the outer wall of the second pin is adapted to the inner wall of the third slot.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This bird-repelling device for the overhead contact system of electrified railways achieves dual protection through the design of the deterrent components, combining physical blocking and sound deterrence. The bird-repelling spikes cooperate with the guide rod through the guide groove two, allowing them to slide along the bird when it lands. At the same time, the first spring, the arc-shaped groove, and the straight groove are used to make the bird-repelling spikes slide and change direction, making it more difficult for birds to land. Meanwhile, when the bird-repelling spikes drive the rotating shaft one to rotate, the meshing transmission of the bevel gear and the bevel gear causes the turntable to rotate and drive the copper bell to sound, startling the birds and thus improving the bird-repelling effect, thereby effectively reducing the probability of bird damage.

[0014] 2. The bird-proofing device for the overhead contact system of electrified railways is connected to the upper hoop via a connecting assembly. The device utilizes components such as guide blocks, threaded rods, and first pins to allow for easy installation through sliding and rotating operations. Disassembly is achieved by pulling the pull rod and rotating the threaded rod, which facilitates subsequent maintenance, repair, and replacement of the equipment, thereby effectively improving operation and maintenance efficiency. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic cross-sectional view of the present invention.

[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of the cylindrical body of this utility model;

[0018] Figure 4 This is a schematic cross-sectional view of the drive-off component of this utility model;

[0019] Figure 5 This is a schematic diagram of the connecting component structure of this utility model;

[0020] Figure 6 This is a schematic diagram of the slot structure of this utility model;

[0021] Figure 7 This utility model Figure 5 A magnified structural diagram of section A;

[0022] Figure 8 This utility model Figure 6 Enlarged structural diagram at point B.

[0023] In the diagram: 1. Lower hoop; 2. Upper hoop; 3. First slot; 4. Second slot; 5. First slide groove; 6. Second slide groove; 7. Circular groove one; 8. Cylinder; 9. Guide groove one; 10. Driving assembly; 11. Rotating shaft one; 12. Copper bell; 13. Guide rod; 14. Guide groove two; 15. Connecting assembly;

[0024] 101. Bird deterrent spike; 102. First spring; 103. Connecting post; 104. Arc groove; 105. Straight groove; 106. Bevel gear; 107. U-shaped gear; 108. Second rotating shaft; 109. Turntable;

[0025] 151. Guide block; 152. Circular groove two; 153. Threaded rod; 154. Circular groove three; 155. Second spring; 156. Convex pin; 157. First pin; 158. Snap-fit ​​component; 1581. Second pin; 1582. Slide plate; 1583. Pull rod; 1584. Third spring; 1585. Third slot. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1 - Figure 8 A bird-proof device for the overhead contact line of an electrified railway includes a lower hoop 1, an upper hoop 2 threadedly connected to the top of the lower hoop 1, a first slot 3, a second slot 4, a first sliding groove 5, a second sliding groove 6 and a circular groove 7 respectively opened on the inner wall of the upper hoop 2, a cylinder 8 provided on the top of the upper hoop 2, a guide groove 9 opened on the outer wall of the cylinder 8, a driving component 10 provided on the inner wall of the cylinder 8, a rotating shaft 11 rotatably sleeved on the inner wall of the cylinder 8, a guide rod 13 fixedly assembled on the inner wall of the cylinder 8, and a connecting component 15 provided on the outer wall of the cylinder 8.

[0028] The bird deterrent assembly 10 includes a bird deterrent spike 101, a connecting post 103 fixedly mounted on the top of a rotating shaft 11, an arc-shaped groove 104 and a straight groove 105 respectively opened on the outer wall of the connecting post 103, a first spring 102 provided on the top of the connecting post 103, a bevel gear 106 fixedly sleeved on the outer wall of the rotating shaft 11, a bevel gear 107 meshing with the outer edge of the bevel gear 106, a rotating shaft 108 fixedly sleeved on the inner wall of the bevel gear 107, a turntable 109 fixedly sleeved on the outer wall of the rotating shaft 108, a copper bell 12 fixedly installed on the outer wall of the turntable 109, and a guide groove 14 opened on the outer wall of the bird deterrent spike 101.

[0029] In the above structure, by setting the bird-repelling component 10, after the lower hoop 1 and upper hoop 2 are installed, the cylindrical body 8 is placed on top of the upper hoop 2, and then the connecting component 15 is operated to fix the cylindrical body 8 to the upper hoop 2. When birds come into contact with the bird-repelling spikes 101 in the bird-repelling component 10, the connecting column 103 uses the first spring 102, the arc groove 104 and the straight groove 105 to generate a sliding direction, causing the bottom rotating shaft 11 to rotate. The rotating shaft 11 will drive the rotating shaft 108 to rotate through the bevel gear 106 and the bevel gear 107. The rotating turntable 109 will drive the copper bell 12 fixedly installed on the outer wall to rotate, so that the copper bell 12 will make a sound when it rotates, thereby repelling the birds.

[0030] In a preferred embodiment: the first spring 102 is located on the inner wall of the bird deterrent spike 101, with one end overlapping the bird deterrent spike 101 and the other end overlapping the connecting post 103.

[0031] In the above structure, by setting the first spring 102 and the bird deterrent spike 101, the first spring 102 will be compressed under the sliding of the bird deterrent spike 101, and the bird deterrent spike 101 will also rebound and reset under the compression of the first spring 102.

[0032] In a preferred embodiment: the outer wall of the guide rod 13 is slidably fitted to the inner wall of the guide groove 14, and the bottom of the bird deterrent spike 101 is slidably fitted to the inner wall of the arc groove 104 and the connecting post 103. The arc groove 104 and the straight groove 105 are regarded as a set of movable components, and the number of such movable components is six, which are arranged in a circular array on the outer wall of the connecting post 103.

[0033] In the above structure, by setting the bird deterrent spike 101, the connecting post 103, and the arc-shaped groove 104, the bird deterrent spike 101 slides along the outer wall of the guide rod 13 through the guide groove 14 due to the weight of the bird. When it slides, its bottom slides along the inner wall of the arc-shaped groove 104. When it slides, the bottom of the bird deterrent spike 101 contacts the inner wall of the straight groove 105, causing the bottom of the bird deterrent spike 101 to slide into the inner wall of the straight groove 105. Then, the bird deterrent spike 101 slides from the bottom to the top of the straight groove 105 using the first spring 102, so that the bird deterrent spike 101 is fully compressed and rebounded to its original position. This allows the bird deterrent spike 101 to repeatedly slide and reset through the six sets of circularly arranged arc-shaped grooves 104 and straight grooves 105.

[0034] In a preferred embodiment: the copper bell 12 is regarded as a set of movable components, and the number of such movable components is four, which are arranged in a circular array on the outer wall of the turntable 109. The connecting component 15 is a set of movable components, and the number of such movable components is two, which are symmetrically arranged with the cylinder 8 as the center.

[0035] In the above structure, by setting the copper bells 12, the first rotating shaft 11 is driven by the connecting column 103 to rotate. The rotating shaft 11 drives the bevel gear 106 fixedly sleeved on the outer wall to rotate. The outer edge of the rotating bevel gear 106 meshes with the outer edge of the bevel gear 107, causing the rotating bevel gear 107 to drive the second rotating shaft 108 fixedly sleeved on the inner wall to rotate. The rotating shaft 108 drives the turntable 109 fixedly sleeved on the outer wall to turn. The four copper bells 12 arranged in a circular array will make a sound as the turntable 109 turns, thus scaring away the birds. At the same time, the connecting components 15 set on both sides of the outer wall of the cylinder 8 will fix the cylinder 8 to the top of the upper hoop 2, thus facilitating disassembly and transportation.

[0036] In a preferred embodiment: the connecting assembly 15 includes a guide block 151, the inner wall of the guide block 151 is provided with a circular groove 152, the inner wall of the circular groove 152 is threadedly connected to a threaded rod 153, the outer wall of the threaded rod 153 is rotatably connected to a first pin 157, the inner wall of the first pin 157 is provided with a circular groove 154, the inner wall of the circular groove 154 is provided with a second spring 155 and a convex pin 156, the inner wall of the upper hoop 2 is provided with a snap-fit ​​member 158, the snap-fit ​​member 158 includes a second pin 1581, the outer wall of the second pin 1581 is fixedly fitted with a slide plate 1582, the outer wall of the slide plate 1582 is fixedly installed with a pull rod 1583, the outer wall of the pull rod 1583 is provided with a third spring 1584, and the outer wall of the convex pin 156 is provided with a third slot 1585.

[0037] In a preferred embodiment: the outer wall of the guide block 151 is slidably fitted against the inner wall of the guide groove 9; the outer wall of the first pin 157 is adapted to the shape of the inner wall of the first slot 3; the outer wall of the convex pin 156 is adapted to the inner wall of the second slot 4; the top of the convex pin 156 is slidably fitted against the inner wall of the first slot 3; the outer wall of the convex pin 156 is slidably fitted against the inner wall of the circular groove 154; and one end of the second spring 155 is fitted against the circular groove 154. The inner wall of the first slot 1581 overlaps with the outer wall of the second slot 1582, and the outer wall of the second slot 1581 overlaps with the outer wall of the first slot 1585. The outer wall of the second slot 1581 slides against the inner wall of the first slot 7. The outer wall of the second slot 1582 slides against the inner wall of the second slot 6. The third spring 1584 is located in the inner cavity of the first slot 7, and one end overlaps with the third spring 1584, and the other end overlaps with the inner wall of the first slot 7. The outer wall of the second slot 1581 is adapted to the inner wall of the third slot 1585.

[0038] In the above structure, by setting the first pin 157, the convex pin 156, and the second pin 1581, when the cylinder 8 is placed on top of the hoop 2, the guide block 151 slides along the inner wall of the guide groove 9 via the sliding guide block 151. Then, when the cylinder 8 slides to the corresponding position on the top of the hoop 2, the threaded rod 153 is rotated, causing the threaded rod 153 to drive the first pin 157 to slide along the inner wall of the circular groove 152 towards the inner wall of the first slot 3. This allows the convex pin 156 to engage with the inner wall of the first slot 3. When the walls come into contact, the convex pin 156 slides along the inner wall of the circular groove 154, causing the second spring 155 to compress. As the convex pin 156 continues to move, when it aligns with the second slot 4, it returns to its original position within the second slot 4 due to the compression and rebound of the second spring 155. Upon returning to its original position, the top of the convex pin 156 contacts one side of the outer wall of the second pin 1581, and the other side slides along the inner wall of the first sliding groove 5, causing the slide plate 1582 to slide along the second sliding groove 5. The displacement of the inner wall of slot 6 causes the slide plate 1582 to compress the third spring 1584. This, in turn, causes the second pin 1581 to continue moving until it corresponds to the third slot 1585. The second pin 1581 and slide plate 1582 then return to their original positions on the inner wall of the third slot 1585 due to the compression and rebound of the third spring 1584, thus completing the connection between the cylinder 8 and the upper hoop 2. Simultaneously, when it is necessary to disassemble the cylinder 8, pulling the pull rod 1583 causes the slide plate 1582 and the second pin 1581 to displace, thus... The slide plate 1582 and the pull rod 1583 will disengage from the inner cavity of the third slot 1585. Then, by rotating the threaded rod 153, the threaded rod 153 drives the first pin 157 to slide along the inner wall of the circular groove 152, so that the convex pin 156 contacts the inner wall of the first slot 3 under the sliding of the first pin 157. Then, the convex pin 156 is compressed and contracted into the inner cavity of the circular groove 154 by the second spring 155 and slides out of the inner wall of the first slot 3, thus completing the connection and disengagement between the cylinder 8 and the upper hoop 2.

[0039] Working principle: First, place the cylinder 8 on top of the upper hoop 2. Then, by sliding the guide block 151, move it along the inner wall of the guide groove 9. When the guide block 151 slides to correspond with the outer wall of the top of the upper hoop 2, rotate the threaded rod 153 clockwise, causing it to rotate and advance within the circular groove 152. This drives the first pin 157 to slide along the groove wall towards the inner wall of the first slot 3. When the top of the first pin 157 touches the entrance of the first slot 3, continue rotating the threaded rod 153 to push it forward. This causes the convex pin 156 to slide along the inner wall of the circular groove 154 and compress the second spring 155, causing the convex pin 156 to retract into the circular groove 154. In the inner cavity of 4, by continuously rotating the threaded rod 153, when the convex pin 156 is aligned with the second slot 4, the convex pin 156 is reset to the inner cavity of the second slot 4 by the rebound of the second spring 155. When the convex pin 156 is reset, its top pushes the second pin 1581 to slide along the inner wall of the first slide groove 5, and drives the slide plate 1582 to slide along the inner wall of the second slide groove 6. At the same time, the sliding will drive the third spring 1584 to compress. At this time, when the second pin 1581 is aligned with the third slot 1585, the second pin 1581 is pushed into the inner cavity of the third slot 1585 by the rebound of the circular groove 154, thereby completing the fixed installation of the cylinder 8 and the upper hoop 2.

[0040] Secondly, when a bird lands on the bird deterrent spike 101, its own weight is transmitted through the spike, causing it to slide down the guide rod 13. The bottom of the spike slides along the inner wall of the arc-shaped groove 104 on the connecting post 103. When it reaches the bottom of the groove, the bottom of the spike enters the inner wall of the straight groove 105. Simultaneously, as the spike slides downwards, it compresses the first spring 102. This sliding motion of the spike causes the connecting post 103 to deflect at an angle, thus deterring the bird. The rotating shaft 11 rotates synchronously, causing the bevel gear 106 to rotate. Through gear meshing, the power is transmitted to the bevel gear 107, which in turn drives the rotating shaft 108 to rotate. The rotating shaft 108 then drives the turntable 109 to rotate, causing the four sets of copper bells 12 mounted on the outer wall of the turntable 109 to rotate as well. The rotating copper bells 12 will make a sound to drive away birds. Then, under the elastic force of the first spring 102, the bird deterrent dart 101 quickly resets along the straight groove 105, thus completing the cycle after triggering.

[0041] When it is necessary to disassemble the cylinder 8, by pulling the lever 1583, the elastic force of the third spring 1584 is used to drive the slide plate 1582 and the second pin 1581 to slide along the inner wall of the second slide groove 6, so that the second pin 1581 completely disengages from the inner wall of the third slot 1585, thereby releasing the lock on the convex pin 156. Then, the threaded rod 153 is rotated counterclockwise, so that the first pin 157 retracts into the inner wall of the circular groove 2 152. During this process, the convex pin 156 is squeezed and compresses the second spring 155 again, completely retracting into the circular groove 3 154, thereby disengaging from the second slot 4, thus completing the connection and disassembly of the cylinder 8 and the upper hoop 2.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bird-proof device for the overhead contact line of an electrified railway, comprising a lower hoop (1), characterized in that: The top of the lower hoop (1) is threadedly connected to the upper hoop (2). The inner wall of the upper hoop (2) is provided with a first slot (3), a second slot (4), a first sliding groove (5), a second sliding groove (6) and a circular groove (7). The top of the upper hoop (2) is provided with a cylinder (8). The outer wall of the cylinder (8) is provided with a guide groove (9). The inner wall of the cylinder (8) is provided with a driving component (10). The inner wall of the cylinder (8) is rotatably sleeved with a rotating shaft (11). The inner wall of the cylinder (8) is fixedly fitted with a guide rod (13). The outer wall of the cylinder (8) is provided with a connecting component (15). The bird deterrent assembly (10) includes a bird deterrent spike (101), a connecting column (103) is fixedly mounted on the top of the first rotating shaft (11), the outer wall of the connecting column (103) is provided with an arc groove (104) and a straight groove (105), the top of the connecting column (103) is provided with a first spring (102), the outer wall of the first rotating shaft (11) is fixedly sleeved with a bevel gear (106), the outer edge of the bevel gear (106) is meshed with an bevel gear (107), the inner wall of the bevel gear (107) is fixedly sleeved with a second rotating shaft (108), the outer wall of the second rotating shaft (108) is fixedly sleeved with a turntable (109), the outer wall of the turntable (109) is fixedly installed with a copper bell (12), and the outer wall of the bird deterrent spike (101) is provided with a guide groove (14).

2. The bird-proofing device for the overhead contact line of an electrified railway according to claim 1, characterized in that: The first spring (102) is located on the inner wall of the bird deterrent spike (101), with one end overlapping the bird deterrent spike (101) and the other end overlapping the connecting post (103).

3. The bird prevention device for an electrified railway overhead line system according to claim 1, characterized in that: The outer wall of the guide rod (13) is slidably fitted to the inner wall of the guide groove (14), and the bottom of the bird deterrent spike (101) is slidably fitted to the inner wall of the arc groove (104) and the connecting column (103). The arc groove (104) and the straight groove (105) are considered as a set of movable components, and there are six sets of such movable components, which are arranged in a circular array on the outer wall of the connecting column (103).

4. The bird prevention device for an electrified railway overhead line system according to claim 1, characterized in that: The copper bell (12) is considered as a set of movable components, and there are four sets of movable components, which are arranged in a circular array on the outer wall of the turntable (109). The connecting component (15) is considered as a set of movable components, and there are two sets of movable components, which are symmetrically arranged with the cylinder (8) as the center.

5. The bird prevention device for an electrified railway overhead line system according to claim 1, characterized in that: The connecting assembly (15) includes a guide block (151), the inner wall of which is provided with a circular groove two (152), the inner wall of which is threadedly connected with a threaded rod (153), the outer wall of which is rotatably connected with a first pin (157), the inner wall of which is provided with a circular groove three (154), the inner wall of which is provided with a second spring (155) and a convex insert. The pin (156) has a snap-fit ​​component (158) on the inner wall of the upper hoop (2). The snap-fit ​​component (158) includes a second pin (1581). A slide plate (1582) is fixedly mounted on the outer wall of the second pin (1581). A pull rod (1583) is fixedly installed on the outer wall of the slide plate (1582). A third spring (1584) is provided on the outer wall of the pull rod (1583). A third slot (1585) is opened on the outer wall of the convex pin (156).

6. The bird prevention device for an electrified railway overhead line system according to claim 5, characterized in that: The outer wall of the guide block (151) is slidably fitted against the inner wall of the guide groove (9). The outer wall of the first pin (157) is adapted to the shape of the inner wall of the first slot (3). The outer wall of the convex pin (156) is adapted to the inner wall of the second slot (4). The top of the convex pin (156) is slidably fitted against the inner wall of the first slot (3). The outer wall of the convex pin (156) is slidably fitted against the inner wall of the circular groove (154). One end of the second spring (155) is fitted against the inner wall of the circular groove (154). The two ends are connected, and the other end is connected to the outer wall of the convex pin (156). The outer wall of the second pin (1581) is slidably fitted to the inner wall of the circular groove (7). The outer wall of the slide plate (1582) is slidably fitted to the inner wall of the second slide groove (6). The third spring (1584) is located in the inner cavity of the circular groove (7), and one end is connected to the third spring (1584), and the other end is connected to the inner wall of the circular groove (7). The outer wall of the second pin (1581) is adapted to the inner wall of the third slot (1585).

Images