Satellite positioning bicycle watch

Abstract

The utility model belongs to the technical field of code table, disclose a kind of satellite positioning bicycle code table, including main part, the main part surface is equipped with display screen, the main part is equipped with satellite positioning module, power supply and CPU inside, the satellite positioning module is used to position and connect with the CPU, the main part is also equipped with scroll switch, the scroll switch is used to determine whether bicycle moves, and connect with the CPU, the CPU is connected with the display screen.

Description

Technical Field

[0001] This utility model relates to the field of cycling computer technology, and in particular to a satellite positioning bicycle cycling computer. Background Technology

[0002] When cycling, speed and mileage need to be recorded. A bicycle speedometer using a satellite positioning system calculates mileage and speed based on the coordinates and positioning time between two satellite points. The satellite signals received by the antenna are processed by the satellite module and transmitted to the speedometer's CPU. The CPU calculates mileage and speed using the coordinates and positioning time between the two satellite points, stores the motion track in a storage IC, and displays the speed and mileage on the screen. After the ride, the motion track can be transmitted to a mobile app via the CPU's Bluetooth function, and the track will be displayed on the app.

[0003] When the bike stops, the positioning coordinates transmitted from the stationary satellite positioning module to the CPU should be the same, resulting in a zero speed and zero mileage, and no track will be generated. However, if the satellite signal strength is weak, the coordinates transmitted from the satellite positioning module to the CPU may have a large tolerance. Therefore, the speed calculated from the two positioning coordinates may not be zero, resulting in mileage and segments of track.

[0004] Therefore, it is necessary to provide a satellite-positioned bicycle speedometer to reduce product costs and filter out false tracks caused by weak satellite signals. Utility Model Content

[0005] This utility model discloses a satellite positioning bicycle speedometer, which can effectively solve the technical problems involved in the background art.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A satellite-positioned bicycle speedometer includes a main body with a display screen on its surface. Inside the main body are a satellite positioning module, a power supply, and a CPU. The satellite positioning module is used for positioning and is connected to the CPU. The main body also has a scroll switch for determining whether the bicycle is moving and is connected to the CPU. The CPU is connected to the display screen.

[0008] The cycling computer is mounted on a bicycle and uses a gyroscope chip to determine whether the user is riding or not. When riding, the computer receives satellite signals; when not riding, it does not. Gyroscopes are relatively expensive, accounting for a significant portion of the overall cost of the cycling computer. The gyroscope chip draws a relatively large current (3.6mA) during operation. Because the cycling computer is small and uses a small-capacity rechargeable battery, the gyroscope's operation can affect its battery life. However, using a scroll switch with a current of less than 10uA does not affect the computer's operation. The scroll switch controls the computer's CPU, allowing it to accept or reject satellite positioning signals, filtering out useless mileage and movement patterns. This device reduces product costs, extends battery life, and filters out false tracks caused by weak satellite signals.

[0009] As a preferred improvement of this utility model: the main body is provided with a Bluetooth module, the Bluetooth module is connected to the CPU and is used to connect to a mobile phone APP, the main body is provided with a storage IC, the storage IC is connected to the CPU, the main body is also provided with a satellite receiving antenna, and the rolling switch is an X3228 normally closed ball vibration switch.

[0010] As a preferred improvement of this utility model: the main body includes a watch body and an extension base, and the watch body is mounted on the handlebars of a bicycle via the extension base;

[0011] The watch body includes a watch body shell, inside which a rechargeable battery is housed, and above the rechargeable battery is a PCB circuit board. The PCB circuit board is connected to a satellite antenna, a satellite receiving module, and a scroll switch. The CPU includes a main control IC, which is located on the PCB circuit board. The display screen is an LCD display, located above the PCB circuit board. A watch body lens is located above the PCB circuit board and connected to the watch body shell. A bottom buckle is provided at the bottom of the watch body shell, and the watch body shell has buttons and a charging port.

[0012] The extension base includes an extension frame upper shell, which is connected to the extension frame base buckle by a second screw. The extension frame base buckle is connected to the bottom buckle of the outer shell. The extension frame upper shell is connected to one end of the extension frame fixing buckle by a copper shaft. The other end of the extension frame fixing buckle is detachably installed to the extension frame upper shell by a first screw. A through hole corresponding to the handlebar is formed between the extension frame upper shell and the extension frame fixing buckle. A rubber gasket is provided at the through hole.

[0013] As a preferred improvement of this utility model: the odometer further includes a fixing component, the fixing component includes a fixing housing, the top surface of the fixing housing is recessed downward to form a fixing slot, the fixing slot is used to place the main body, the fixing housing has a fixing hole on the left side and a fixing rod corresponding to the fixing hole on the right side, the fixing hole and the fixing rod are both located at the fixing slot.

[0014] As a preferred improvement of this utility model: the fixing rod is a telescopic rod, and an elastic buffer layer is provided on the left side of the fixing rod.

[0015] As a preferred improvement of this utility model: a button is provided on the right side of the main body, a connecting through hole is provided on the right side of the fixed housing, a lever is hinged at the connecting through hole, the right side of the lever is located outside the fixed housing, the lever is connected to a pressure rod, a pressure plate is provided at the end of the pressure rod away from the lever, the lever rotates to cause the pressure plate to press the button, and a return spring is provided between the lever and the fixed housing.

[0016] As a preferred improvement of this utility model: a connecting block is installed at the bottom of the fixed housing, and the bottom surface of the connecting block is recessed upward to form a spherical rotating groove. The odometer is also provided with a connecting housing. A left hemisphere is provided on the left side of the top surface of the connecting housing, and a right hemisphere is slidably connected to the right side. The left hemisphere and the right hemisphere are assembled in the spherical rotating groove. A locking rod is rotatably connected to the connecting housing. The outer surface of the locking rod is provided with threads. The right hemisphere is screwed to the locking rod. One side of the locking rod is located outside the connecting housing. Rotating the locking rod causes the right hemisphere to move. The connecting housing can be detachably installed on the bicycle.

[0017] As a preferred improvement of this utility model: a left clip is provided on the left side of the bottom of the connecting housing, and a right clip is provided on the right side. The connecting housing can be detachably installed on the bicycle via the left clip and the right clip. The left clip and the right clip are connected by a buckle and are both made of elastic material. An elastic buffer is provided at the bottom of the connecting housing.

[0018] As a preferred improvement of this utility model: the locking rod is installed on the connecting housing via a limiting ring.

[0019] As a preferred improvement of this utility model: a first locking band is provided on the left side of the bottom of the connecting housing, and a second locking band is provided on the right side. The first locking band has a plurality of locking holes evenly distributed along its length. A locking member is provided at the bottom end of the second locking band. The locking member includes a housing. The housing has a locking band through groove extending in the left-right direction. The bottom of the locking band through groove has a locking hole, and the top has a locking slide groove. A first elastic member is fixed at the top of the locking slide groove. A first locking rod is connected to the bottom of the first elastic member. The first locking rod is set corresponding to the locking hole and slides up and down. The bottom side of the first locking rod has an inclined surface. A first unlocking rod body is provided on the upper side of the first locking rod. The housing is slidably connected to a second unlocking rod body. A limit rod is fixed to the second unlocking rod body. The limit rod is connected to the housing through a second elastic member. One end of the second unlocking rod body is located outside the housing. The first unlocking rod body and the second unlocking rod body are correspondingly set. Both the first unlocking rod body and the second unlocking rod body have an inclined surface on their adjacent sides. Pushing the second unlocking rod body causes the first locking rod to move upward.

[0020] The beneficial effects of this utility model are as follows:

[0021] This device has a simple structure and low cost. It uses a rolling switch to control the reception of satellite signals. When the rider stops and comes to a standstill, the rolling switch is also stationary. If the speed is zero for more than 10 seconds (10 seconds is an assumed value), the CPU detects that the rolling switch is also stationary and stops receiving satellite positioning coordinates. If there is a tolerance between the positioning coordinates, the speed, mileage and track are no longer calculated. When the rider resumes riding, the rolling switch is reset due to shaking of the speedometer, and the speedometer starts receiving satellite positioning data again. The CPU detects that the rolling switch will draw a current of less than 10uA, so it has little impact on the battery life. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a satellite positioning bicycle speedometer according to the present invention;

[0024] Figure 2 This is a schematic diagram of the main body installation of this utility model;

[0025] Figure 3 This is a schematic diagram of the toggle button structure of this utility model;

[0026] Figure 4This is a schematic diagram of the connecting block structure of this utility model;

[0027] Figure 5 This is a schematic diagram of the connecting shell structure of this utility model;

[0028] Figure 6 This is a schematic diagram of the locking component structure of this utility model;

[0029] Figure 7 This is a schematic diagram of the installation of the watch body of this utility model;

[0030] Figure 8 This is a cross-sectional view of the watch body of this utility model.

[0031] Figure 9 This is an exploded view of the assembly of the watch body of this utility model.

[0032] In the diagram: 100-Main body, 101-Button, 200-Fixing component, 201-Fixing housing, 202-Fixing hole, 203-Fixing rod, 204-Toggle lever, 205-Pressure lever, 206-Pressure plate, 207-Connecting block, 300-Connecting housing, 301-Left locking band, 302-Right locking band, 303-Left hemisphere, 304-Right hemisphere, 305-Locking rod, 306-First locking band, 307-Second locking band, 308-Locking component, 3081-Housing, 3082-Locking band through groove, 3083-Locking hole, 3084-First locking rod, 3085-First elastic element, 3086-First unlocking rod, 3087-Second Unlock lever, 3088-Limit lever, 3089-Second elastic element, 400-Watch body, 401-Watch body lens, 402-LCD display, 403-Main control IC, 404-Satellite antenna, 405-Satellite receiver module, 406-Rechargeable battery, 407-Watch body shell, 408-Shell bottom buckle, 409-Roll switch, 410-PCB circuit board, 411-Button, 412-Charging port, 500-Extension base, 501-Extension bracket upper shell, 502-Rubber pad, 503-First screw, 504-Copper shaft, 505-Extension bracket fixing buckle, 506-Extension bracket base buckle, 507-Second screw, 600-Handlebar. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0035] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0038] Please see Figure 1As shown, this utility model provides a satellite-positioned bicycle speedometer, including a main body 100. The main body 100 has a display screen on its surface. Inside the main body 100 are a satellite positioning module, a power supply, and a CPU. The satellite positioning module is used for positioning and is connected to the CPU. The main body 100 also has a scroll switch, which is used to determine whether the bicycle is moving and is connected to the CPU. The CPU is connected to the display screen. Specifically, the main body 100 is installed on a bicycle to monitor its movement. The satellite positioning module (GPS) is used to locate the bicycle's position and calculate the speed based on changes in time and position. The power supply provides power to the entire device. The CPU (control chip) controls the entire device, receives positioning information, and controls the display screen to display information such as speed and time. The scroll switch is used to determine whether the bicycle is moving. When the bicycle moves, it vibrates, causing the scroll switch to change. The CPU (control chip) detects the change and determines that the bicycle is moving; otherwise, it determines that the bicycle is stationary. If the bicycle remains stationary for a certain period, the satellite positioning module (GPS) is turned off, and no movement record is generated.

[0039] In one implementation, the main body 100 is equipped with a Bluetooth module, which is connected to the CPU and used to connect to a mobile phone APP. The main body 100 also contains a storage IC, which is connected to the CPU. The main body 100 further includes a satellite receiving antenna, and the scroll switch is an X3228 normally closed ball vibration switch.

[0040] Please see Figure 2 As shown, the odometer also includes a fixing component 200, which includes a fixing housing 201. The top surface of the fixing housing 201 is recessed to form a fixing slot for placing the main body 100. The fixing housing 201 has a fixing hole 202 on its left side and a fixing rod 203 corresponding to the fixing hole 202 on its right side. Both the fixing hole 202 and the fixing rod 203 are located at the fixing slot. The fixing rod 203 is a telescopic rod, and an elastic buffer layer is provided on its left side. Rotating the fixing rod 203 allows it to be inserted into the fixing hole 202, thus fixing the main body 100 and preventing it from moving. The elastic buffer layer provides protection.

[0041] Please see Figure 3As shown, a button 101 is provided on the right side of the main body 100, and a connecting through hole is provided on the right side of the fixed housing 201. A lever 204 is hinged to the connecting through hole. The right side of the lever 204 is located outside the fixed housing 201. A pressure rod 205 is connected to the lever 204. A pressure plate 206 is provided at the end of the pressure rod 205 away from the lever 204. Rotation of the lever 204 causes the pressure plate 206 to press the button 101. A return spring is provided between the lever 204 and the fixed housing 201. Specifically, the button 101 can switch different pages of the display screen, and the lever 204 allows the user to easily operate the display screen while riding. The pressure plate 206 has a large area, which ensures the accuracy of pressing the button 101.

[0042] Please see Figure 4 As shown, a connecting block 207 is installed at the bottom of the fixed housing 201. The bottom surface of the connecting block 207 is recessed upwards to form a spherical rotating groove. The odometer also has a connecting housing 300. A left hemisphere 303 is provided on the left side of the top surface of the connecting housing 300, and a right hemisphere 304 is slidably connected to the right side. The left hemisphere 303 and the right hemisphere 304 are assembled in the spherical rotating groove. A locking rod 305 is rotatably connected to the connecting housing 300. The outer surface of the locking rod 305 is threaded. The right hemisphere 304 is screwed to the locking rod 305. One side of the locking rod 305 is located outside the connecting housing 300. Rotating the locking rod 305 causes the right hemisphere 304 to move. The connecting housing 300 can be detachably installed on the bicycle. With the above configuration, the connecting block 207 can rotate relative to the connecting housing 300, making it convenient for the user to adjust the position of the main body 100 and to view the display screen more clearly. Rotating the locking rod 305 causes the right hemisphere 304 to move horizontally, and the left hemisphere 303 and the right hemisphere 304 to move closer to or further away from each other, thereby getting closer to or further away from the inner wall of the spherical rotating groove, achieving the effect of locking and releasing.

[0043] The connecting housing 300 has a left retaining strap 301 on the bottom left and a right retaining strap 302 on the bottom right. The connecting housing 300 can be detachably installed on the bicycle via the left retaining strap 301 and the right retaining strap 302. The left retaining strap 301 and the right retaining strap 302 are connected by buckles and are both made of elastic material. The bottom of the connecting housing 300 has an elastic buffer to facilitate the fixing of the fixing housing 201. The locking rod 305 is installed on the connecting housing 300 via a limiting ring to prevent it from deviating from its position.

[0044] Please see Figures 5-6As shown, the connecting housing 300 has a first locking band 306 on the bottom left and a second locking band 307 on the bottom right. The first locking band 306 has multiple locking holes evenly distributed along its length. The second locking band 307 has a locking member 308 at its bottom end. The locking member 308 includes a housing 3081. The housing 3081 has a locking band through groove 3082 extending in the left-right direction. The bottom of the locking band through groove 3082 has a locking hole 3083, and the top has a locking slide groove. A first elastic member 3085 is fixed to the top of the locking slide groove. The bottom of the first elastic member 3085 (spring) is connected to a first locking rod 3084. The first locking rod 3084 is set corresponding to the locking hole 3083 and slides up and down. The locking rod 3084 has a slope on its bottom side, and the first locking rod 3084 has a first unlocking rod 3086 on its upper side. The housing 3081 is slidably connected to a second unlocking rod 3087. The second unlocking rod 3087 is fixed with a limit rod 3088. The limit rod 3088 is connected to the housing 3081 through a second elastic member 3089. One end of the second unlocking rod 3087 is located outside the housing 3081. The first unlocking rod 3086 and the second unlocking rod 3087 are correspondingly arranged. The sides of the first unlocking rod 3086 and the second unlocking rod 3087 that are close to each other have slopes. Pushing the second unlocking rod 3087 causes the first locking rod 3084 to move upward. Specifically, the locking rod 3084 has an inclined surface. The first locking band 306 is inserted into the locking band through groove 3082. The first locking band 306 abuts against the first locking rod 3084, and contact with the inclined surface lifts the first locking rod 3084. The first locking rod 3084 is then inserted into the locking hole 3083. The right side is flat; pulling the first locking band 306 to the left will not lift the first locking rod 3084, thus achieving a fixing effect. Pushing the second unlocking rod 3087 will cause the first locking rod 3084 to move upward, releasing the restriction on the first locking band 306, at which point the first locking band 306 can be pulled out. It should be further noted that any other components used to achieve the above effects should fall within the inventive concept of this utility model and should be protected within the scope of this utility model.

[0045] Please see Figures 7-9As shown, the main body 100 includes a watch body 400 and an extension base 500. The watch body 400 is mounted on the handlebars 600 of a bicycle via the extension base 500. The watch body 400 includes a watch body shell 407, inside which a rechargeable battery 106 is housed. A PCB circuit board 410 is located above the rechargeable battery 106. The PCB circuit board 410 is connected to a satellite antenna 404, a satellite receiving module 405, and a scroll switch 409. The CPU includes a main control IC 403, which is located on the PCB circuit board 410. The display screen is an LCD display 402, located above the PCB circuit board 410. A watch lens 401 is located above the PCB circuit board 410. The watch body lens 401 is connected to the watch body shell 407. The bottom of the watch body shell 407 is provided with a shell bottom buckle 408. The watch body shell 407 is provided with a button 411 and a charging port 412. The extension base 500 includes an extension frame upper shell 501. The extension frame upper shell 501 is connected to the extension frame base buckle 506 by a second screw 507. The extension frame base buckle 506 is connected to the shell bottom buckle 408. The extension frame upper shell 501 is connected to one end of the extension frame fixing buckle 505 by a copper shaft 504. The other end of the extension frame fixing buckle 505 is detachably installed to the extension frame upper shell 501 by a first screw 503. A through hole corresponding to the handlebar 600 is formed between the extension frame upper shell 501 and the extension frame fixing buckle 505. A rubber gasket 202 is provided at the through hole.

[0046] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A satellite-positioned bicycle speedometer, characterized in that: The system includes a main body (100), the surface of which is provided with a display screen. Inside the main body (100) are a satellite positioning module, a power supply, and a CPU. The satellite positioning module is used for positioning and is connected to the CPU. The main body (100) is also provided with a scroll switch (409), which is used to determine whether the bicycle is moving and is connected to the CPU. The CPU is connected to the display screen. The main body (100) includes a watch body (400) and an extension base (500), the watch body (400) being mounted on the handlebars (600) of a bicycle via the extension base (500); The watch body (400) includes a watch body shell (407), inside which is a rechargeable battery (106). Above the rechargeable battery (106) is a PCB circuit board (410). The PCB circuit board (410) is connected to a satellite antenna (404), a satellite receiving module (405), and a scroll switch (409). The CPU includes a main control IC (403), which is located on the PCB circuit board (410). The display screen is an LCD display (402), located above the PCB circuit board (410). Above the PCB circuit board (410) is a watch body lens (401), which is connected to the watch body shell (407). The bottom of the watch body shell (407) is provided with a shell bottom buckle (408). The watch body shell (407) is provided with a button (411) and a charging port (412). The extension base (500) includes an extension frame upper shell (501), which is connected to the extension frame base buckle (506) by a second screw (507). The extension frame base buckle (506) is connected to the outer shell bottom buckle (408). The extension frame upper shell (501) is connected to one end of the extension frame fixing buckle (505) by a copper shaft (504). The other end of the extension frame fixing buckle (505) is detachably installed to the extension frame upper shell (501) by a first screw (503). A through hole corresponding to the handlebar (600) is formed between the extension frame upper shell (501) and the extension frame fixing buckle (505). A rubber gasket (502) is provided at the through hole. The codebook also includes a fixing component (200), which includes a fixing housing (201). The top surface of the fixing housing (201) is recessed downward to form a fixing slot, which is used to place the main body (100). The fixing housing (201) has a fixing hole (202) on the left side and a fixing rod (203) corresponding to the fixing hole (202) on the right side. The fixing hole (202) and the fixing rod (203) are both located at the fixing slot. A button (101) is provided on the right side of the main body (100), and a connecting through hole is provided on the right side of the fixed housing (201). A lever (204) is hinged at the connecting through hole. The right side of the lever (204) is located outside the fixed housing (201). A pressure rod (205) is connected to the lever (204). A pressure plate (206) is provided at the end of the pressure rod (205) away from the lever (204). The lever (204) rotates so that the pressure plate (206) presses the button (101). A return spring is provided between the lever (204) and the fixed housing (201).

2. The satellite positioning bicycle speedometer according to claim 1, characterized in that: The main body (100) is equipped with a Bluetooth module, which is connected to the CPU and used to connect to a mobile APP. The main body (100) is equipped with a storage IC, which is connected to the CPU. The main body (100) is also equipped with a satellite receiving antenna. The rolling switch (409) is an X3228 normally closed ball vibration switch.

3. The satellite positioning bicycle speedometer according to claim 1, characterized in that: The fixing rod (203) is a telescopic rod, and an elastic buffer layer is provided on the left side of the fixing rod (203).

4. A satellite-positioned bicycle speedometer according to claim 1, characterized in that: The fixed housing (201) is equipped with a connecting block (207) at the bottom. The bottom surface of the connecting block (207) is recessed upward to form a spherical rotating groove. The odometer is also provided with a connecting housing (300). The left hemisphere (303) is provided on the left side of the top surface of the connecting housing (300), and the right hemisphere (304) is slidably connected to the right side. The left hemisphere (303) and the right hemisphere (304) are assembled in the spherical rotating groove. The connecting housing (300) is rotatably connected with a locking rod (305). The outer surface of the locking rod (305) is provided with threads. The right hemisphere (304) is screwed to the locking rod (305). One side of the locking rod (305) is located outside the connecting housing (300). Rotating the locking rod (305) causes the right hemisphere (304) to move. The connecting housing (300) can be detachably installed on the bicycle.

5. A satellite-positioned bicycle speedometer according to claim 4, characterized in that: The connecting housing (300) has a left clasp (301) on the left side of the bottom and a right clasp (302) on the right side. The connecting housing (300) can be detachably installed on the bicycle via the left clasp (301) and the right clasp (302). The left clasp (301) and the right clasp (302) are connected by buckles and are both made of elastic material. The bottom of the connecting housing (300) is provided with an elastic buffer.

6. A satellite-positioned bicycle speedometer according to claim 4, characterized in that: The locking rod (305) is installed on the connecting housing (300) via a limiting ring.

7. A satellite-positioned bicycle speedometer according to claim 4, characterized in that: The connecting housing (300) has a first locking band (306) on the left side of its bottom and a second locking band (307) on the right side. The first locking band (306) has multiple locking holes evenly distributed along its length. The second locking band (307) has a locking member (308) at its bottom end. The locking member (308) includes a housing (3081). The housing (3081) has a locking band through groove (3082) extending in the left-right direction. The bottom of the locking band through groove (3082) has a locking hole (3083), and the top has a locking slide groove. A first elastic member (3085) is fixed to the top of the locking slide groove. A first locking rod (3084) is connected to the bottom of the first elastic member (3085). The first locking rod (3084) is set corresponding to the locking hole (3083) and slides up and down. The bottom side of the first locking rod (3084) is provided with a slope. The upper side of the first locking rod (3084) is provided with a first unlocking rod body (3086). The housing (3081) is slidably connected with a second unlocking rod body (3087). The second unlocking rod body (3087) is fixed with a limit rod (3088). The limit rod (3088) is connected to the housing (3081) through a second elastic element (3089). One end of the second unlocking rod body (3087) is located outside the housing (3081). The first unlocking rod body (3086) and the second unlocking rod body (3087) are correspondingly arranged. The sides of the first unlocking rod body (3086) and the second unlocking rod body (3087) that are close to each other are provided with slopes. Pushing the second unlocking rod body (3087) causes the first locking rod (3084) to move upward.

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