Internet node equipment for data transmission

Abstract

The invention relates to the technical field of internet, and discloses internet node equipment for data transmission, which comprises a box body, rotating columns are movably connected to the tops of the two ends of the box body, steel plates are fixedly connected to the bottoms of the centers of the two rotating columns, a cabinet door is movably connected to the front end of the box body, a sun visor is fixedly connected to the top of the box body, and the sun visor is fixedly connected to the bottom of the box body. An electronic component is correspondingly connected in the box body, the bottom of the electronic component is correspondingly connected with a heat dissipation device, the heat dissipation device comprises a moving device and a power device, and the moving device can drive the power device to move left and right, so that the electronic component at the top is uniformly cooled, and local overheating is avoided. The bottom of the power device is connected with a pushing device, the two ends of the pushing device are correspondingly connected with the inner side of the bottom of the steel plate, when the pushing device pushes towards the two sides, the steel plate can expand towards the two sides under the rotating action of the rotating column, and air flow in the box body is further accelerated.

Description

Technical Field

[0001] The present invention relates to the field of Internet technologies, and particularly to an Internet node device for data transmission. Background Art

[0002] With the rapid development of Internet technologies, Internet node devices for data transmission are increasingly widely used in communication networks. Such devices are usually composed of multiple electronic components, and a large amount of heat is generated during long-term operation. If the heat cannot be dissipated in time, the internal temperature of the device will rise sharply, which will in turn affect the performance and lifespan of the electronic components. Existing Internet node devices usually adopt passive heat dissipation methods, such as heat sinks or simple fan heat dissipation. However, these heat dissipation methods are uneven, and the temperature in some areas inside the device is too high, which easily leads to a decline in the performance or damage of the electronic components. To solve the above problems, there are also some improvement solutions in the prior art, such as increasing the number of fans or adopting a liquid cooling heat dissipation system. However, these solutions are often complex in structure, high in cost, and difficult to operate stably in outdoor environments. Based on this, the present invention proposes an Internet node device for data transmission to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide an Internet node device for data transmission to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An Internet node device for data transmission, including a box body. Rotating columns are movably connected to the tops of both ends of the box body. Steel plates are fixedly connected to the bottoms of the centers of the two rotating columns. Under the rotation of the rotating columns, the two steel plates can move to both sides, thereby opening or closing the ventilation openings of the box body, promoting the air flow inside and outside the box body. A cabinet door is movably connected to the front end of the box body, which is convenient for the maintenance and repair of the device. A sunshade plate is fixedly connected to the top of the box body. The sunshade plate can not only block sunlight to prevent the device from overheating, but also is designed as an inclined surface structure, which can make rainwater flow down along the inclined surface during rainfall, avoiding the accumulation of rainwater. Electronic components are correspondingly connected inside the box body, and a heat dissipation device is correspondingly connected to the bottoms of the electronic components. The heat dissipation device includes a moving device and a power device. The moving device can drive the power device to move left and right, thereby uniformly dissipating heat from the electronic components at the top and avoiding local overheating;

[0005] A pushing device is connected to the bottom of the power device. The two ends of the pushing device are correspondingly connected to the inner sides of the bottoms of the steel plates. When the pushing device pushes to both sides, the steel plates will expand to both sides under the rotation of the rotating columns, further accelerating the air flow inside the box body and enhancing the heat dissipation effect.

[0006] As a preferred technical solution of the present invention, the mobile device includes a hollow plate. Both ends of the top of the hollow plate are movably connected with two first movable blocks. The convex parts inside the two first movable blocks are movably connected with first rotating shafts. Both ends of the two first rotating shafts are movably connected with cylinders, and the bottoms of the two opposite cylinders are fixedly connected with both ends of the top of the hollow plate.

[0007] As a preferred technical solution of the present invention, two connecting rods are fixedly connected to the hollow part in the center of the hollow plate. A motor is fixedly connected to the inner sides of the centers of the two connecting rods. The top of the motor is movably connected with a second rotating shaft, and the top of the second rotating shaft is movably connected with a power device.

[0008] As a preferred technical solution of the present invention, the power device includes two long rods. The bottoms of the two long rods are fixedly connected to the grooves at the tops of the four first movable blocks. Both ends of the tops of the two long rods are movably connected with two second movable blocks. The centers of the tops of the four second movable blocks are fixedly connected with support columns, and the tops of the four support columns are movably connected with small fan blades.

[0009] As a preferred technical solution of the present invention, connecting columns are movably connected to the tops of the centers of the two long rods. The bottom ends of the two connecting columns are fixedly connected with rotating blocks. The bottoms of the two rotating blocks are movably connected with a long strip plate, and the groove at the center of the long strip plate is movably connected with the top of the second rotating shaft.

[0010] As a preferred technical solution of the present invention, the pushing device includes a bottom plate. Two short plates are fixedly connected to both sides of the top of the bottom plate. Four sliding rods are fixedly connected to the tops of the four short plates. Four sliding short blocks are movably connected to the tops of the four sliding rods. Two pushing plates are fixedly connected to the tops of the four sliding short blocks. The convex parts at the tops of the two pushing plates are correspondingly connected to the inner sides of the bottom of the steel plate.

[0011] As a preferred technical solution of the present invention, a double-rod cylinder is fixedly connected to the top of the center of the bottom plate. Convex blocks are fixedly connected to the output shaft ends of both ends of the double-rod cylinder. The grooves at the tops of the two convex blocks are movably connected with gears. The tops of the two gears are meshed with racks, and the tops of the two racks are fixedly connected to the bottoms of the two pushing plates.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] (1) An Internet node device for data transmission. By connecting the inner sides of two first movable blocks to the output shaft ends of cylinders respectively, driving them in opposite directions by two cylinders, and combining with the rotation of the first rotating shaft, the first movable block can smoothly slide back and forth at both ends of the top of the hollow plate. The top of the first movable block is fixedly connected to the bottom of the long rod in the power device. Therefore, when the first movable block slides, the long rod will be driven to move left and right, thereby realizing the reciprocating motion of the power device.

[0014] (2) An Internet node device for data transmission. By arranging two connecting rods at the central hollow part of the hollow plate, the motor fixedly connected to the inner sides of the connecting rods can be stably supported at the central position, thereby providing stable support for the rotation of the power device. When the motor drives the second rotating shaft movably connected to its top to rotate, the second rotating shaft will quickly drive the power device movably connected to its top to move. Through this design, the power device can not only move back and forth under the push of the cylinder, but also use the rotation of the second rotating shaft to further accelerate the transformation of its position, thereby improving the heat dissipation efficiency and effectively cooling the electronic components inside the box.

[0015] (3) An Internet node device for data transmission. By arranging a second movable block at the top of the long rod, it can not only move back and forth under the drive of the central motor, but also move left and right under the rotation of the second rotating shaft, so that the small fan blades movably connected to the top of the support column can fully dissipate heat from the bottom of the box. The central groove of the long strip plate is movably connected to the top of the second rotating shaft. When the long strip plate is driven by the second rotating shaft to rotate, it will pull the rotating blocks movably connected to both ends of the long strip plate and one end of the connecting column to move towards the center. This structure can effectively disperse the gravity generated during the reciprocating push of the cylinder, thereby improving the stability and heat dissipation efficiency of the device.

[0016] (4) An Internet node device for data transmission. By arranging two convex blocks at the output shaft ends of the double-rod cylinder, when the double-rod cylinder drives to both sides, it can push the gears movably connected to the front grooves of the convex blocks to rotate. Two racks are meshed and connected to the tops of the two gears, and the top of the rack is fixedly connected to the center of the bottom of the push plate. Therefore, when the gears rotate, they will drive the push plates on both sides to expand to both sides. The two ends of the bottom of the push plate are fixedly connected with sliding short blocks, and the sliding short blocks can slide back and forth on the outer surface of the sliding rod, thereby helping the push plate to run smoothly when pushing both sides of the bottom of the box without jamming. Through the expansion movement of the push plate, external air can be introduced into the box interior, promoting air flow, effectively reducing a large amount of hot air accumulated inside the box, and preventing the explosion risk caused by overheating. Description of the Drawings

[0017] Figure 1Schematic diagram of the side structure of the box body of the present invention;

[0018] Figure 2 Schematic diagram of the internal structure of the box body of the present invention;

[0019] Figure 3 Overall schematic diagram of the heat dissipation device in the present invention;

[0020] Figure 4 Schematic diagram of the connection relationship between the moving device and the power device in the present invention;

[0021] Figure 5 Schematic diagram of the moving device in the present invention;

[0022] Figure 6 Schematic diagram of the power device in the present invention;

[0023] Figure 7 Schematic diagram of the pushing device in the present invention;

[0024] Figure 8 Schematic diagram of the connection relationship of the double-rod cylinder in the present invention.

[0025] In the figure: 1. Box body; 2. Steel plate; 3. Rotating column; 4. Electronic components; 5. Heat dissipation device; 51. Moving device; 511. Hollow plate; 512. First movable block; 513. First rotating shaft; 514. Cylinder; 515. Connecting rod; 516. Motor; 517. Second rotating shaft; 52. Power device; 521. Long rod; 522. Second movable block; 523. Support column; 524. Small fan blades; 525. Connecting column; 526. Rotating block; 527. Long strip plate; 53. Pushing device; 531. Bottom plate; 532. Short plate; 533. Sliding rod; 534. Sliding short block; 535. Pushing plate; 536. Double-rod cylinder; 537. Convex block; 538. Gear; 539. Rack; 6. Cabinet door; 7. Sunscreen board. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment: Please refer to Figures 1 - 8, An Internet node device for data transmission, including a box body 1. At the top of both ends of the box body 1, rotating columns 3 are provided, and the top of both ends of the box body 1 is movably connected to both ends of the rotating columns 3. At the bottom center of both of the rotating columns 3, steel plates 2 are provided, and the bottom center of both of the rotating columns 3 is fixedly connected to the top of the steel plates 2. Under the rotation of the rotating columns 3, the two steel plates 2 can move to both sides, thereby opening or closing the ventilation openings of the box body 1, promoting the air flow inside and outside the box body 1. The front end of the box body 1 is movably connected with a cabinet door 6, which is convenient for the maintenance and repair of the equipment. The top of the box body 1 is fixedly connected with a sunshade plate 7. The sunshade plate 7 can not only block sunlight to prevent the equipment from overheating, but also is designed as an inclined surface structure, which can make the rainwater flow down along the inclined surface during rainfall to avoid rainwater accumulation. Inside the box body 1, electronic components 4 are correspondingly connected. At the bottom of the electronic components 4, a heat dissipation device 5 is correspondingly connected. The heat dissipation device 5 includes a moving device 51 and a power device 52. The moving device 51 can drive the power device 52 to move left and right, thereby evenly dissipating heat from the electronic components 4 at the top and avoiding local overheating;

[0028] At the bottom of the power device 52, a pushing device 53 is connected. Both ends of the pushing device 53 are correspondingly connected to the inner sides of the bottoms of the steel plates 2. When the pushing device 53 pushes to both sides, the steel plates 2 will expand to both sides under the rotation of the rotating columns 3, further accelerating the air flow inside the box body 1 and enhancing the heat dissipation effect.

[0029] The moving device 51 includes a hollow plate 511. At both ends of the top of the hollow plate 511, two first movable blocks 512 are provided, and both ends of the top of the hollow plate 511 are movably connected to the bottoms of the two first movable blocks 512. On the protruding parts inside both of the first movable blocks 512, first rotating shafts 513 are provided, and the protruding parts inside both of the first movable blocks 512 are movably connected to the centers of the first rotating shafts 513. At both ends of both of the first rotating shafts 513, air cylinders 514 are provided, and both ends of both of the first rotating shafts 513 are movably connected to the output shaft ends of the air cylinders 514. By connecting the inner sides of the two first movable blocks 512 to the output shaft ends of the air cylinders 514 respectively, using the opposite-direction driving of the two air cylinders 514 and combining with the rotation of the first rotating shafts 513, the first movable blocks 512 can slide back and forth smoothly at both ends of the top of the hollow plate 511. The top of the first movable block 512 is fixedly connected to the bottom of the long rod 521 in the power device 52. Therefore, when the first movable block 512 slides, the long rod 521 will be driven to move left and right, thereby realizing the reciprocating motion of the power device 52. And the bottoms of the two opposite air cylinders 514 are fixedly connected to both ends of the top of the hollow plate 511.

[0030] There are two connecting rods 515 arranged at the central hollow part of the hollow plate 511, and both ends of the two connecting rods 515 are fixedly connected to the central hollow part of the hollow plate 511. There is a motor 516 arranged inside the centers of the two connecting rods 515, and both sides of the motor 516 are fixedly connected to the inside of the centers of the two connecting rods 515. There is a second rotating shaft 517 arranged at the top of the motor 516, and the bottom of the second rotating shaft 517 is movably connected to the top of the motor 516. There is a power device 52 arranged at the top of the second rotating shaft 517. By arranging two connecting rods 515 at the central hollow part of the hollow plate 511, the motor 516 fixedly connected to the inside of the connecting rods 515 can be stably supported at the central position, thereby providing stable support for the rotation of the power device 52. When the motor 516 drives the second rotating shaft 517 movably connected to its top to rotate, the second rotating shaft 517 will quickly drive the power device 52 movably connected to its top to move. Through this design, the power device 52 can not only move back and forth under the push of the air cylinder 514, but also use the rotation of the second rotating shaft 517 to further accelerate the change of its position, thereby improving the heat dissipation efficiency and effectively cooling the electronic components 4 inside the box body 1. And the top of the second rotating shaft 517 is movably connected to the center of the power device 52.

[0031] The power device 52 includes two long rods 521. The bottoms of the two long rods 521 are fixedly connected to the grooves at the tops of four first movable blocks 512. There are two second movable blocks 522 arranged at the tops of both ends of the two long rods 521, and the bottoms of the two second movable blocks 522 are movably connected to the tops of both ends of the two long rods 521. There are support columns 523 arranged at the centers of the tops of the four second movable blocks 522, and the bottoms of the four second movable blocks 522 are fixedly connected to the bottoms of the support columns 523. There is a small fan blade 524 arranged at the tops of the four support columns 523, and the tops of the four support columns 523 are movably connected to the center of the small fan blade 524.

[0032] A connecting column 525 is provided at the center top of each of the two long rods 521, and the center top of each of the two long rods 521 is movably connected to the top end of the connecting column 525. A rotating block 526 is provided at the bottom end of each of the two connecting columns 525, and the bottom end of each of the two connecting columns 525 is fixedly connected to the outer surface of the rotating block 526. A long strip plate 527 is provided at the bottom of each of the two rotating blocks 526, and the bottom of each of the two rotating blocks 526 is movably connected to both ends of the long strip plate 527. By providing a second movable block 522 at the top of the long rod 521, it can not only move back and forth under the drive of the central motor 516, but also move left and right under the rotation of the second rotating shaft 517, so that the small fan blades 524 movably connected to the top of the support column 523 can fully dissipate heat from the bottom of the box body 1. The central groove of the long strip plate 527 is movably connected to the top of the second rotating shaft 517. When the long strip plate 527 is driven by the second rotating shaft 517 to rotate, it will pull the rotating blocks 526 and one end of the connecting column 525 movably connected to both ends of the long strip plate 527 to move towards the center. This structure can effectively disperse the gravity generated during the back-and-forth pushing process of the cylinder 514, thereby improving the stability and heat dissipation efficiency of the device. And the central groove of the long strip plate 527 is movably connected to the top of the second rotating shaft 517.

[0033] The pushing device 53 includes a bottom plate 531. Two short plates 532 are provided on both sides of the top of the bottom plate 531, and both sides of the top of the bottom plate 531 are fixedly connected to the bottoms of the two short plates 532. Four sliding rods 533 are provided on the tops of the four short plates 532, and the tops of the four short plates 532 are fixedly connected to the bottoms of the sliding rods 533. Four sliding short blocks 534 are provided on the tops of the four sliding rods 533, and the tops of the four sliding rods 533 are movably connected to the inner grooves of the sliding short blocks 534. Two pushing plates 535 are provided on the tops of the four sliding short blocks 534, and the tops of the four sliding short blocks 534 are fixedly connected to the bottoms of the two pushing plates 535. The protruding parts at the top ends of the two pushing plates 535 are correspondingly connected to the inner side of the bottom of the steel plate 2.

[0034] At the center of the top of the bottom plate 531, a double-rod cylinder 536 is provided, and the center of the top of the bottom plate 531 is fixedly connected to the bottom of the double-rod cylinder 536. At both ends of the output shaft of the double-rod cylinder 536, convex blocks 537 are provided, and both ends of the output shaft of the double-rod cylinder 536 are fixedly connected to the bottom ends of the convex blocks 537. At the groove at the top of each of the two convex blocks 537, a gear 538 is provided, and both sides of the gear 538 are movably connected to the groove at the top of each of the two convex blocks 537. On the outer surface of the top of each of the two gears 538, a rack 539 is provided, and the outer surface of the rack 539 is meshed with the outer surface of each of the two gears 538. By providing two convex blocks 537 at the output shaft ends of the double-rod cylinder 536, when the double-rod cylinder 536 drives to both sides, the gears 538 movably connected to the front grooves of the convex blocks 537 can be pushed to rotate. The two gears 538 are meshed with a rack 539 at the top, and the top of the rack 539 is fixedly connected to the center of the bottom of the push plate 535. Therefore, when the gears 538 rotate, the push plates 535 on both sides will be driven to expand to both sides. At both ends of the bottom of the push plate 535, sliding short blocks 534 are fixedly connected. The sliding short blocks 534 can slide back and forth on the outer surface of the sliding rod 533, so as to help the push plate 535 run smoothly when pushing both sides of the bottom of the box body 1 and prevent jamming. Through the expansion movement of the push plate 535, external air can be introduced into the interior of the box body 1, promoting air flow, effectively reducing a large amount of hot air accumulated inside the box body 1, and preventing the risk of explosion caused by excessive temperature. And the tops of the two racks 539 are both fixedly connected to the bottoms of the two push plates 535.

[0035] The working principle of the present invention is as follows:

[0036] When the electronic components 4 inside the box body 1 start to work, a large amount of heat will be generated. At this time, the heat dissipation device 5 needs to be started to dissipate heat from the bottom of the electronic components 4, and the sunscreen plate 7 on the top of the box body 1 effectively blocks direct sunlight, preventing the equipment from aggravating the internal heat accumulation due to the excessive external environmental temperature. Through efficient heat dissipation design and air flow control, the box body 1 can maintain the internal temperature within a safe range, avoiding damage to the electronic components 4 or the risk of explosion caused by excessive temperature;

[0037] The moving device 51 includes a cylinder 514. The cylinder 514 drives the first movable block 512 to slide back and forth at both ends of the top of the hollow plate 511 through the output shaft. The sliding of the first movable block 512 will drive the corresponding long rod 521 at the top to move left and right, thereby driving the power device 52 to dissipate heat from the electronic components 4 evenly;

[0038] The long rod 521 in the power device 52 drives the second movable block 522 to move back and forth and left and right, so that the small fan blades 524 at the top of the support column 523 assist in dissipating heat from the bottom of the box body 1. Through the dual drive of the air cylinder 514 and the second rotating shaft 517, the heat dissipation device 5 can quickly respond to temperature changes, achieve multi-level heat dissipation, and ensure that the electronic components 4 are always within the appropriate operating temperature range. At the same time, the motor 516 drives the second rotating shaft 517 to rotate, driving the long strip plate 527 and the rotating block 526 to move, further accelerating the position movement of the small fan blades 524. It solves the problem that when the current data node device is in use, the temperature inside the ladder is likely to be too high, thereby affecting the lifespan of the electronic components 4 inside the machine body;

[0039] The pushing device 53 corresponding to the bottom of the power device 52 will push the steel plates 2 to both sides, so that the steel plates 2 expand to both sides under the rotation of the rotating columns 3, opening the ventilation openings of the box body 1. The expansion movement of the pushing plate 535 is realized by the sliding of the sliding short block 534 on the sliding rod 533, ensuring smooth operation without jamming. The expansion of the pushing plate 535 introduces external air into the box body 1 and discharges the internal hot air at the same time, forming an efficient air flow cycle and significantly reducing the temperature inside the box body 1.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An Internet node device for data transmission, comprising a box (1), wherein the tops of both ends of the box (1) are movably connected to rotating columns (3), and the central bottoms of the two rotating columns (3) are fixedly connected to steel plates (2). Under the rotation of the rotating columns (3), the two steel plates (2) can move to both sides, thereby opening or closing the ventilation openings of the box (1) to promote the flow of air inside and outside the box (1). The front end of the box (1) is movably connected to a cabinet door (6) to facilitate maintenance and inspection of the equipment. The top of the box (1) is fixedly connected to a sunscreen (7), which can not only block sunlight to prevent the equipment from overheating, but also is designed as an inclined structure, which can make rainwater flow down the inclined surface during rainfall to avoid rainwater accumulation. The inside of the box (1) is correspondingly connected to an electronic component (4), and the bottom of the electronic component (4) is correspondingly connected to a heat dissipation device (5), characterized in that: The heat dissipation device (5) comprises a moving device (51) and a power device (52), wherein the moving device (51) can drive the power device (52) to move left and right, thereby evenly dissipating heat from the electronic components (4) on the top to avoid local overheating; The bottom of the power device (52) is connected to a pushing device (53), and the two ends of the pushing device (53) are correspondingly connected to the inner side of the bottom of the steel plate (2). When the pushing device (53) pushes to both sides, the steel plate (2) will expand to both sides under the rotation of the rotating column (3), further accelerating the air flow inside the box (1) and enhancing the heat dissipation effect.

2. The Internet node device for data transmission according to claim 1, characterized in that: The moving device (51) comprises a hollow plate (511), two first movable blocks (512) are movably connected to both ends of the top of the hollow plate (511), the inner protruding portions of the two first movable blocks (512) are movably connected to first rotating shafts (513), both ends of the two first rotating shafts (513) are movably connected to cylinders (514), and the bottoms of the two opposite cylinders (514) are fixedly connected to both ends of the top of the hollow plate (511).

3. The Internet node device for data transmission according to claim 2, characterized in that: Two connecting rods (515) are fixedly connected to the hollowed-out center of the hollow plate (511); a motor (516) is fixedly connected to the inner sides of the centers of the two connecting rods (515); a second rotating shaft (517) is movably connected to the top of the motor (516); and a power device (52) is movably connected to the top of the second rotating shaft (517).

4. The Internet node device for data transmission according to claim 3, characterized in that: The power device (52) comprises two long rods (521), the bottoms of the two long rods (521) being fixedly connected to the grooves at the tops of four first movable blocks (512), the tops of both ends of the two long rods (521) being movably connected to two second movable blocks (522), the top centres of the four second movable blocks (522) being fixedly connected to support columns (523), and the tops of the four support columns (523) being movably connected to small fan blades (524).

5. The Internet node device for data transmission according to claim 4, characterized in that: The center tops of the two long rods (521) are movably connected to connecting columns (525), the bottoms of the two connecting columns (525) are fixedly connected to rotating blocks (526), ​​the bottoms of the two rotating blocks (526) are movably connected to long strips (527), and the center grooves of the long strips (527) are movably connected to the top of the second rotating shaft (517).

6. The Internet node device for data transmission according to claim 1, characterized in that: The pushing device (53) comprises a bottom plate (531), two short plates (532) are fixedly connected to the two sides of the top of the bottom plate (531), the tops of the four short plates (532) are fixedly connected to sliding rods (533), the tops of the four sliding rods (533) are movably connected to sliding short blocks (534), the tops of the four sliding short blocks (534) are fixedly connected to two pushing plates (535), and the top convex parts of the two pushing plates (535) are correspondingly connected to the inner side of the bottom of the steel plate (2).

7. The Internet node device for data transmission according to claim 6, characterized in that: A double-rod cylinder (536) is fixedly connected to the top center of the bottom plate (531), and convex blocks (537) are fixedly connected to the output shaft ends at both ends of the double-rod cylinder (536). Gears (538) are movably connected to the grooves at the tops of the two convex blocks (537), and racks (539) are meshedly connected to the tops of the two gears (538), and the tops of the two racks (539) are fixedly connected to the bottoms of the two push plates (535).

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