A new state indicating lamp for charging pile

Abstract

The application belongs to the technical field of charging piles, and particularly relates to a novel state indicating lamp for a charging pile, which comprises a pile column. An accommodating groove is formed in one end of the pile column. A panel made of transparent material is connected to the inside of the accommodating groove. A color-changing light bar is arranged in the accommodating groove. By pulling the sliding block, the sliding block, the second spring and the bottom support slide away from the sliding groove. At this time, the protrusion on the sliding block is separated from the sliding groove. The protrusion extends out of the sliding block under the action of the elastic member, and simultaneously spreads apart the sliding block. The protrusion plays a shielding role, so that the sliding block cannot be reset. At this time, the color-changing light bar is placed between the sliding block and the bottom support. After the color-changing light bar is placed, the protrusion is pressed, so that the protrusion enters the sliding block. At this time, the second spring drives the sliding block and the bottom support to reset.

Description

Technical Field

[0001] This invention belongs to the field of charging pile technology, specifically a new type of status indicator light for charging piles. Background Technology

[0002] Charging piles are charging devices that provide energy replenishment for electric vehicles. Their function is similar to that of a gas pump in a gas station. They can be fixed to the ground or wall and installed in public buildings (public buildings, shopping malls, public parking lots, etc.) and residential parking lots or charging stations. They can charge various models of electric vehicles according to different voltage levels. The surface of the charging pile is equipped with indicator lights to indicate whether it is fully charged, so that the power can be unplugged in time when it is fully charged.

[0003] The indicator lights on existing charging stations are mostly simple indicator lights, which can only indicate whether the battery is fully charged. The display is too simple and it is difficult to display the charging amount in real time and thus remind people of the charging level. At the same time, the simple indicator light is also not aesthetically pleasing.

[0004] Therefore, the present invention provides a novel status indicator light for charging piles. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A novel status indicator light for charging piles, comprising a pile post; one end of the pile post has a placement groove, a transparent panel is snapped into the inside of the placement groove, a RGB light strip is provided inside the placement groove, several sliding grooves are provided on the side of the pile post near the placement groove, a slider with an "L"-shaped cross-section is slidably connected inside the sliding groove, a second spring is fixedly connected inside the sliding groove, the other end of the second spring is fixedly connected to the slider, a base is fixedly connected to the end of the slider away from the second spring, the RGB light strip is located between the slider and the base, a protrusion is slidably connected to the top of the slider via an elastic element, and several limiting grooves are provided on the surface of the pile post; existing charging pile indicator lights are mostly simple indicator lights, which can only indicate whether the battery is fully charged, the display is too simplistic, and it is difficult to display the charging level in real time, thus failing to remind people of the charging level. At the same time, a simple indicator light is also not aesthetically pleasing. In this invention, by pulling the slider, the slider, along with the second spring and the base, slides away from the sliding groove. At this time, the protrusion on the slider... After leaving the chute, the protrusion extends from the slider under the action of the elastic element, simultaneously dispersing the slider. The protrusion acts as a barrier, preventing the slider from resetting. At this point, the iridescent light strip is placed between the slider and the base. After the iridescent light strip is placed, the protrusion is pressed, causing it to enter the slider. At this time, the second spring drives the slider and the base to reset, allowing the surface of the iridescent light strip to adhere to the surface of the post. The transparent material and the placement slot are then snapped together, enabling quick installation and replacement of the iridescent light strip. When it is damaged and needs replacement, it can be quickly replaced. When the post is charging the tram, the iridescent light strip can connect to the network through the built-in network chip, displaying the brightness progress of the iridescent light strip according to the charging progress, thus providing real-time charging progress information. The surrounding display of the iridescent light strip provides a better user experience. Since the post has an internal MCU controller, the color and brightness of the iridescent light strip can be changed through the MCU controller. The MCU controller can also collect relevant data, thereby achieving the function of changing the color and brightness of the iridescent light strip while also realizing a diversified display function.

[0007] Preferably, a rolling column is rotatably connected to the top of the protrusion, and the rolling column is made of rubber. During operation, by installing the rolling column on the protrusion, the rolling column can block the slider from resetting. When the slider needs to reset, by pressing the slider, the rolling column is squeezed and will drive the protrusion to slide and retract into the slider, thereby facilitating the rapid reset of the slider. Thus, it is no longer necessary to press the protrusion, which has a fast and convenient function.

[0008] Preferably, the surface of the base is provided with a rectangular groove, a rectangular plate is slidably connected inside the rectangular groove, a first spring is fixedly connected inside the rectangular groove, the other end of the first spring is fixedly connected to the rectangular plate, and the top of the rectangular plate is rotatably connected to a baffle through a torsion spring. During operation, when the RGB LED strip is placed between the slider and the base, the RGB LED strip will contact the rectangular plate and the baffle, pushing the baffle and the rectangular plate to slide into the base, thus facilitating the RGB LED strip to enter between the base and the slider. After the RGB LED strip enters, the first spring will reset the rectangular plate and the baffle, allowing the arc-shaped baffle to block and prevent the RGB LED strip from sliding out between the slider and the base, thereby fixing the RGB LED strip.

[0009] Preferably, a sealing plate is fixedly connected to the end of the base away from the slider, an air vent is opened on the surface of the pile, a connecting hole communicating with the air vent is opened inside the sliding groove, and a through hole communicating with the air vent is opened inside the limiting groove. During operation, by installing the sealing plate, the sealing plate slides in a sealed manner when entering the limiting groove, and the slider also slides in a sealed manner when resetting. Therefore, the gas in the sliding groove and the limiting groove will be quickly pushed into the air vent, and the gas will be discharged through the air vent and blown towards the RGB LED strip, thereby cleaning the RGB LED strip and the placement groove, and also cooling the RGB LED strip to prevent the surface temperature of the RGB LED strip from becoming too high and making it difficult to use.

[0010] Preferably, during operation, when the gas is discharged through the vent, it first enters the blower inside the vent, causing the blower to expand and unfold rapidly. The unfolded blower cleans the LED strip and the placement slot, thereby reducing dust and impurities on their surface and preventing dust and impurities from affecting the brightness of the LED strip. After the blower expands, gas continues to fill its interior. At this time, the constriction hole at one end opens, allowing the gas to be blown out, thus achieving the function of air blowing to assist in cleaning and cooling.

[0011] Preferably, a storage groove is provided on one side of the slider, and a fan blade is fixedly installed inside the storage groove. A vent hole communicating with the storage groove is provided on one side of the slider, and a gasket is fixedly installed on the side of the slider near the storage groove. During operation, by installing the fan blade and starting the fan blade, the fan blade draws external cold air into the storage groove. The external cold air then quickly cools down the LED strip after long-term operation. At the same time, the gasket installed on the slider acts as a buffer and protects the LED strip, preventing hard contact between the slider and the LED strip, which could lead to damage.

[0012] Preferably, two symmetrically arranged and inclined guide plates are fixedly installed inside the storage slot, and a dustproof net is fixedly installed on the side of the two guide plates that are close to each other. During operation, by setting the inclined guide plates, the air blown out by the fan blades can be guided to all directions by the guide plates, avoiding the situation where the air blown out by the fan blades blows directly onto the LED strip, causing only the part of the LED strip close to the storage slot to achieve rapid cooling. At the same time, by installing gaskets, a certain gap is made between the LED strip and the storage slot, which facilitates the blowing out of the air.

[0013] Preferably, a connecting ring is fixedly installed at one end of the two sliders that are close to each other. The connecting ring is arc-shaped and its surface is made of anti-slip material. During operation, by installing the connecting ring, multiple sliders are connected together, so that when one slider is pulled, multiple sliders can be moved together through the connecting ring, which facilitates the insertion of the RGB LED strip. At the same time, the anti-slip material on the surface of the connecting ring increases friction and makes it easier to grip the connecting ring for use.

[0014] The beneficial effects of this invention are as follows: 1. This invention provides a novel status indicator light for charging piles. By pulling a slider, the slider, along with a second spring and a base, slides away from the groove. At this time, a protrusion on the slider leaves the groove and extends out of the slider under the action of an elastic element, simultaneously spreading the slider. The protrusion acts as a barrier, preventing the slider from returning to its original position. A color-changing light strip is then placed between the slider and the base. After the light strip is in place, pressing the protrusion causes it to enter the slider. The second spring then drives the slider and base to return to their original positions, allowing the surface of the light strip to adhere to the surface of the charging pile. The transparent material and the placement groove are then snapped together for quick installation and replacement of the light strip. When the light strip is damaged and needs replacement, it can be quickly replaced. When the charging pile is charging a vehicle, the light strip can connect to the network via a built-in network chip, displaying the brightness progress of the light strip according to the charging progress, thus providing real-time charging updates. The surrounding display of the light strip provides a better user experience. Furthermore, the light strip can be programmed via a data interface on the charging pile.

[0015] 2. This invention provides a novel status indicator light for charging piles. When the iridescent light strip is placed between the slider and the base, it contacts the rectangular plate and the baffle. By pushing the baffle and the rectangular plate into the base, the iridescent light strip can easily enter between the base and the slider. After the iridescent light strip enters, the first spring will reset the rectangular plate and the baffle, allowing the arc-shaped baffle to block and prevent the iridescent light strip from sliding out between the slider and the base, thus fixing the iridescent light strip. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a three-dimensional structural diagram of the pile column in this invention; Figure 2 This is a cross-sectional view of the limiting groove in this invention; Figure 3 This is a schematic diagram of the slider structure in this invention; Figure 4 In this invention Figure 3 A schematic diagram of the structure at point A; Figure 5 This is a schematic diagram of the structure of the storage slot in this invention; Figure 6 This is a schematic diagram of the structure at the air outlet in this invention; Figure 7 This is a schematic diagram of the connecting ring in Embodiment 2 of the present invention.

[0019] In the diagram: 1. Second spring; 2. Pile; 3. Placement groove; 4. Panel; 5. Iridescent light strip; 6. Slide groove; 7. Slider; 8. Protrusion; 9. Base support; 10. Limiting groove; 11. Rolling column; 12. Rectangular groove; 13. Rectangular plate; 14. First spring; 15. Baffle; 16. Sealing plate; 17. Through hole; 18. Connecting hole; 19. Vent hole; 20. Blower; 21. Gasket; 22. Storage groove; 23. Vent hole; 24. Fan blade; 25. Guide plate; 26. Dustproof net; 27. Connecting ring; 1. Second spring. Detailed Implementation

[0020] To make the technical means, creative features, achieved objectives, and effects of this invention readily understandable, the invention is further described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. Example 1

[0021] Please see Figures 1-6As shown in the embodiment of the present invention, a novel status indicator light for a charging pile includes a pile post 2; one end of the pile post 2 has a placement groove 3, a transparent panel 4 is snapped into the inside of the placement groove 3, a RGB LED strip 5 is provided inside the placement groove 3, and a plurality of sliding grooves 6 are provided on the side of the pile post 2 near the placement groove 3. A slider 7 with an "L"-shaped cross-section is slidably connected inside the sliding groove 6, and a second spring 1 is fixedly connected inside the sliding groove 6. The other end of the second spring 1 is fixedly connected to the slider 7, and a base 9 is fixedly connected to the end of the slider 7 away from the second spring 1. The colored light strip 5 is located between the slider 7 and the base 9. The top of the slider 7 is slidably connected to the protrusion 8 via an elastic element. The surface of the pile 2 is provided with several limiting grooves 10. Existing charging piles mostly have simple indicator lights, which can only indicate whether the battery is fully charged. The display is too simple and it is difficult to display the charging amount in real time, thus failing to remind people of the charging level. At the same time, a simple indicator light is also not aesthetically pleasing. In this invention, when the slider 7 is pulled, the slider 7, along with the second spring 1 and the base 9, slides away from the sliding groove 6. At this time, the protrusion 8 on the slider 7 disengages from the sliding groove 6. Inside the groove 6, the protrusion 8 extends out of the slider 7 under the action of the elastic element, simultaneously dispersing the slider 7. The protrusion 8 acts as a barrier, preventing the slider 7 from resetting. At this point, the iridescent light strip 5 is placed between the slider 7 and the base 9. After the iridescent light strip 5 is in place, the protrusion 8 is pressed, causing it to enter the slider 7. The second spring 1 then drives the slider 7 and base 9 to reset, causing the surface of the iridescent light strip 5 to adhere to the surface of the post 2. The transparent material and the placement groove 3 are then snapped together and fixed, thus enabling quick installation and replacement of the iridescent light strip 5. When it is damaged and needs replacement, it can be quickly replaced. The function of the light strip 5 is as follows: when the charging post 2 is charging the tram, the light strip 5 can connect to the network through its built-in network chip, and then display the brightness progress of the light strip 5 according to the charging progress, thereby indicating the real-time charging progress to people. At the same time, the surrounding display of the light strip 5 can bring a better experience. Since the charging post 2 has an MCU controller installed inside, the color and brightness of the light strip 5 can be changed through the MCU controller. At the same time, the MCU controller can also be used to collect relevant data, thereby achieving the function of changing the color and brightness of the light strip 5 while also realizing a diversified display function.

[0022] The top of the protrusion 8 is rotatably connected to a rolling column 11, which is made of rubber. During operation, by installing the rolling column 11 on the protrusion 8, the rolling column 11 can prevent the slider 7 from resetting. When the slider 7 needs to reset, by pressing the slider 7, the rolling column 11 is squeezed and will drive the protrusion 8 to slide and retract into the slider 7, thereby facilitating the quick reset of the slider 7. Thus, it is no longer necessary to press the protrusion 8, which has a quick and convenient function.

[0023] The surface of the base 9 is provided with a rectangular groove 12. A rectangular plate 13 is slidably connected inside the rectangular groove 12. A first spring 14 is fixedly connected inside the rectangular groove 12. The other end of the first spring 14 is fixedly connected to the rectangular plate 13. The top of the rectangular plate 13 is rotatably connected to a baffle 15 via a torsion spring. During operation, when the iridescent light strip 5 is placed between the slider 7 and the base 9, the iridescent light strip 5 will contact the rectangular plate 13 and the baffle 15. By pushing the baffle 15 and the rectangular plate 13 into the base 9, the iridescent light strip 5 can easily enter between the base 9 and the slider 7. After the iridescent light strip 5 enters, the first spring 14 will reset the rectangular plate 13 and the baffle 15, so that the arc-shaped baffle 15 can block and prevent the iridescent light strip 5 from sliding out between the slider 7 and the base 9, thereby fixing the iridescent light strip 5.

[0024] A sealing plate 16 is fixedly connected to the end of the base 9 away from the slider 7. An air vent 19 is opened on the surface of the pile 2. A connecting hole 18 communicating with the air vent 19 is opened inside the slide groove 6. A through hole 17 communicating with the air vent 19 is opened inside the limiting groove 10. During operation, by installing the sealing plate 16, the sealing plate 16 slides in a sealed manner when entering the limiting groove 10, and the slider 7 also slides in a sealed manner when resetting. Therefore, the gas in the slide groove 6 and the limiting groove 10 will be quickly pushed into the air vent 19. The gas is discharged through the air vent 19 and blown towards the RGB LED strip 5, thereby cleaning the RGB LED strip 5 and the placement groove 3. At the same time, it can also cool down the RGB LED strip 5 and prevent the surface temperature of the RGB LED strip 5 from becoming too high and making it difficult to use.

[0025] During operation, when the gas is discharged through the vent 19, it first enters the blower 20 inside the vent 19, causing the blower 20 to expand and unfold rapidly. The unfolded blower 20 cleans the LED strip 5 and the placement slot 3, thereby reducing dust and impurities on their surfaces and preventing dust and impurities from affecting the brightness of the LED strip 5. After the blower 20 expands, gas continues to fill its interior. At this time, the constriction hole at one end opens, allowing the gas to be blown out, thus achieving the function of air blowing to assist in cleaning and cooling.

[0026] A storage groove 22 is provided on one side of the slider 7, and a fan blade 24 is fixedly installed inside the storage groove 22. A vent hole 23 communicating with the storage groove 22 is provided on one side of the slider 7. A gasket 21 is fixedly installed on the side of the slider 7 near the storage groove 22. During operation, by installing the fan blade 24 and starting the fan blade 24, the fan blade 24 draws external cold air into the storage groove 22. The external cold air then quickly cools down the LED strip 5 after long-term operation. At the same time, the gasket 21 installed on the slider 7 acts as a buffer and protects the LED strip 5, preventing the slider 7 and the LED strip 5 from making hard contact and causing damage.

[0027] Two symmetrically arranged and inclined guide plates 25 are fixedly installed inside the storage slot 22. A dustproof net 26 is fixedly installed on the side of the two guide plates 25 that is close to each other. During operation, by setting the inclined guide plates 25, the gas blown out by the fan blade 24 can be guided to all directions by the guide plates 25, avoiding the gas blown out by the fan blade 24 from blowing directly onto the RGB LED strip 5, which would cause only the part of the RGB LED strip 5 close to the storage slot 22 to achieve rapid cooling. At the same time, the installed gasket 21 makes a certain gap between the RGB LED strip 5 and the storage slot 22, which facilitates the blowing out of the gas. Example 2

[0028] like Figure 7 As shown in Example 1, another embodiment of the present invention is as follows: A connecting ring 27 is fixedly installed at one end of the two sliders 7 that are close to each other. The connecting ring 27 is arc-shaped and its surface is made of non-slip material. During operation, by installing the connecting ring 27, multiple sliders 7 are connected together. This allows multiple sliders 7 to move together when one slider 7 is pulled, which facilitates the insertion of the iridescent light strip 5. At the same time, the non-slip material on the surface of the connecting ring 27 increases friction and makes it easier to grip the connecting ring 27 for use.

[0029] Working principle: By pulling the slider 7, the slider 7, along with the second spring 1 and the base 9, slides away from the groove 6. At this time, the protrusion 8 on the slider 7 leaves the groove 6 and extends out of the slider 7 under the action of the elastic element, simultaneously spreading the slider 7. The protrusion 8 acts as a barrier, preventing the slider 7 from returning to its original position. Then, the iridescent light strip 5 is placed between the slider 7 and the base 9. After the iridescent light strip 5 is placed, the protrusion 8 is pressed, causing it to enter the slider 7. At this time, the second spring 1 drives the slider 7 and the base 9 to return to their original positions, thus making the surface of the iridescent light strip 5 fit against the surface of the post 2. Finally, the transparent material and the placement groove 3 are snapped together and fixed, thus enabling quick installation and replacement of the iridescent light strip. The function of light strip 5 is to enable quick replacement when it is damaged and needs to be replaced. When the charging post 2 is charging the tram, the iridescent light strip 5 can connect to the network through its built-in network chip and then display the brightness progress of the iridescent light strip 5 according to the charging progress, thereby indicating the real-time charging progress to people. At the same time, the surrounding display of iridescent light strip 5 can bring a better experience. Since the charging post 2 has an MCU controller installed inside, the color and brightness of iridescent light strip 5 can be changed through the MCU controller. At the same time, the MCU controller can also be used to collect relevant data, thereby achieving the function of changing the color and brightness of iridescent light strip 5 while also realizing a diversified display function.

[0030] By installing a rolling pin 11 on the protrusion 8, the rolling pin 11 acts to prevent the slider 7 from resetting. When the slider 7 needs to reset, pressing the slider 7 compresses the rolling pin 11, causing the protrusion 8 to slide and retract into the slider 7, thus facilitating the quick reset of the slider 7. This eliminates the need to press the protrusion 8 again, providing a fast and convenient reset. When the iridescent light strip 5 is placed between the slider 7 and the base 9, it contacts the rectangular plate 13 and the baffle 15. Pushing the baffle 15 and the rectangular plate 13 into the base 9 facilitates the entry of the iridescent light strip 5 between the base 9 and the slider 7. Once the iridescent light strip 5 is in place, the first spring 14 resets the rectangular plate 13 and the baffle 15, allowing the arc-shaped baffle 15 to block and prevent the iridescent light strip 5 from sliding out between the slider 7 and the base 9, thus fixing the iridescent light strip 5. By installing the sealing plate 16, the sealing plate 16 slides in a sealed manner when entering the limiting groove 10, and the slider 7 also slides in a sealed manner when resetting. Therefore, the gas in the sliding groove 6 and the limiting groove 10 will be quickly pushed into the vent 19. The gas is discharged through the vent 19 and then blown towards the RGB LED strip 5, thereby cleaning the RGB LED strip 5 and the placement groove 3. At the same time, it can also cool down the RGB LED strip 5, preventing the surface temperature of the RGB LED strip 5 from becoming too high and making it difficult to use.

[0031] When gas is discharged through the vent 19, it first enters the blower 20 inside the vent 19, causing the blower 20 to expand and unfold rapidly. The unfolded blower 20 cleans the LED strip 5 and the placement slot 3, reducing dust and impurities on their surfaces and preventing dust and impurities from affecting the brightness of the LED strip 5. After the blower 20 expands, gas continues to fill its interior. At this time, the constriction hole at one end opens, allowing gas to be blown out, achieving the function of auxiliary cleaning and cooling. By installing the fan blade 24 and starting the fan blade 24, the fan blade 24 draws external cold air into the storage slot 22. The external cold air then quickly cools the LED strip 5 after prolonged use. At the same time, a shim 21 is installed on the slider 7 to cushion and protect the LED strip 5, preventing hard contact between the slider 7 and the LED strip 5 and thus avoiding damage. By setting an inclined guide plate 25, the gas blown out by the fan blade 24 can be guided to all directions by the guide plate 25, avoiding the situation where the gas blown out by the fan blade 24 blows directly towards the iridescent light strip 5, causing only the part of the iridescent light strip 5 near the storage groove 22 to achieve rapid cooling. At the same time, by installing a gasket 21, a certain gap is created between the iridescent light strip 5 and the storage groove 22, which facilitates the blowing out of the gas.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A novel status indicator light for charging piles, comprising a pile post (2); characterized in that: The pile (2) has a placement groove (3) at one end, and a transparent panel (4) is snapped into the inside of the placement groove (3). The placement groove (3) has a holographic light strip (5) inside. The pile (2) has several sliding grooves (6) on the side near the placement groove (3). The sliding groove (6) has a slider (7) with an "L" shaped cross section slidably connected inside. The sliding groove (6) has a second spring (1) fixedly connected inside. The other end of the second spring (1) is fixedly connected to the slider (7). The end of the slider (7) away from the second spring (1) is fixedly connected to a base (9). The holographic light strip (5) is located between the slider (7) and the base (9). The top of the slider (7) is slidably connected to a protrusion (8) through an elastic element. The surface of the pile (2) has several limiting grooves (10). The top of the protrusion (8) is rotatably connected to a rolling column (11), which is made of rubber. The surface of the base (9) is provided with a rectangular groove (12), and a rectangular plate (13) is slidably connected inside the rectangular groove (12). A first spring (14) is fixedly connected inside the rectangular groove (12), and the other end of the first spring (14) is fixedly connected to the rectangular plate (13). The top of the rectangular plate (13) is rotatably connected to a baffle (15) through a torsion spring. A sealing plate (16) is fixedly connected to the end of the base (9) away from the slider (7). An air vent (19) is opened on the surface of the pile (2). A connecting hole (18) communicating with the air vent (19) is opened inside the slide groove (6). A through hole (17) communicating with the air vent (19) is opened inside the limiting groove (10). A storage groove (22) is provided on one side of the slider (7), and a fan blade (24) is fixedly installed inside the storage groove (22). A ventilation hole (23) communicating with the storage groove (22) is provided on one side of the slider (7), and a gasket (21) is fixedly installed on the side of the slider (7) near the storage groove (22). The storage slot (22) has two symmetrically arranged and inclined guide plates (25) fixedly installed inside, and a dustproof net (26) is fixedly installed on the side of the two guide plates (25) that are close to each other. A connecting ring (27) is fixedly installed at one end of the two sliders (7) that are close to each other. The connecting ring (27) is arc-shaped and its surface is made of anti-slip material.

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