Network switch device

Abstract

The invention belongs to the technical field of data exchange networks, and particularly relates to a network switch device which comprises a machine shell and a main board installed in the machine shell, each interface of the main board penetrates through the side wall of the machine shell, the network switch device further comprises two partition plates, the two partition plates are fixedly installed in the machine shell and arranged on one side of the main board, and the two partition plates are arranged in the machine shell. The two partition plates divide the interior of the machine shell into a main body cavity, an installation cavity and a heat dissipation channel, and the main board is installed in the main body cavity. And the ventilation unit is arranged in the mounting cavity. According to the invention, the ventilation quantity passing through each position and each interface of the mainboard can be automatically regulated and controlled based on different heat of different areas and each interface of the mainboard, under the same power consumption, the utilization rate of heat dissipation airflow is improved, the heat dissipation efficiency is higher, the ventilation speed can be automatically regulated and controlled based on the temperature, and meanwhile, the heat dissipation efficiency is improved. And personnel can be prompted to maintain the switch in time, and stable operation of the switch is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of data exchange networks, and in particular relates to a network switch device. Background Art

[0002] A switch is a network device used for forwarding electro-optical signals. It can connect multiple devices to a computer network and forward data to the destination through data packet exchange. It is one of the indispensable network devices in corporate offices and other places.

[0003] At present, the switch contains various electronic components, such as chips, capacitors, resistors, etc., and the switch needs to bear a large number of optical fiber cables. When working, it will generate a lot of heat inside. In order to prevent the heat from affecting the stability of the switch, the switch generally needs to consider the heat dissipation problem when designing, such as a network switch disclosed in patent announcement number CN208768102U; Nowadays, switches generally use an overall heat dissipation method when dissipating heat. A temperature sensor is installed inside the switch. When the temperature sensor detects that the temperature reaches the threshold, the heat dissipation structure is used to dissipate the heat inside the switch. However, when the switch is in use, not all of its interfaces are fully connected, and the cables connected to each interface do not work synchronously. Therefore, the temperature at each interface of the switch is not the same. Although the overall heat dissipation can ensure that the heat inside the switch is dissipated in time, the heat dissipation performance is not fully utilized. Under the same power consumption, its heat dissipation efficiency is low. Summary of the invention

[0004] The object of the present invention is to provide a network switch device in view of the above problems.

[0005] To achieve the above object, the present invention adopts the following technical solution: a network switch device, comprising a housing and a mainboard installed inside the housing, wherein each interface of the mainboard penetrates the side wall of the housing, and further comprising: Two partitions are fixedly installed inside the housing, and the two partitions are arranged on one side of the main board. The two partitions separate the interior of the housing into a main cavity, an installation cavity and a heat dissipation channel, and the main board is installed inside the main cavity; A ventilation unit, disposed inside the installation cavity, for introducing external airflow into the interior of the housing; A dust-proof and dehumidifying unit is installed on the side wall of the housing and is connected to the air inlet end of the ventilation unit; An exhaust unit is installed inside the heat dissipation channel, and the exhaust unit is connected to the air outlet end of the ventilation unit; A detection mechanism is arranged inside the housing, and the detection mechanism is electrically connected to the exhaust unit and the ventilation unit; The early warning unit is installed inside the installation cavity.

[0006] Preferably, the ventilation unit includes a driving shaft rotatably arranged inside the installation cavity, and installation sleeves are provided on the outer sides of both ends of the shaft wall of the driving shaft, and the two installation sleeves are installed inside the installation cavity, and the shaft wall of the driving shaft is located at one end inside the two installation sleeves and is fixedly sleeved with a fan impeller, and the side walls of the two installation sleeves are located on one side of the air outlet end of the fan impeller on the same side and are fixedly plugged with air outlet pipes, and the two air outlet pipes are connected to the interior of the heat dissipation channel, and a driving assembly is installed inside the installation cavity.

[0007] Preferably, the dustproof and dehumidification unit includes a strip hole opened on the side wall of the casing, and two mounting plates are rotatably provided inside the strip hole, and the side walls on the lower side of the two mounting plates are both installed with removable fixed plates, and the outer sides of the two fixed plates are jointly covered with a removable dustproof mesh cover, the interior of the dustproof mesh cover is filled with dehumidification filler, and the drive shaft is installed with a transmission assembly for driving the two mounting plates to rotate, and two rubber frame strips are fixedly installed on the hole wall of the strip hole, and the inner walls of the two rubber frame strips are in contact with the outer wall of the dustproof mesh cover.

[0008] Preferably, the exhaust unit includes a plurality of magnetic shielding bent pipes fixedly plugged into the side walls of the heat dissipation channel, and each of the magnetic shielding bent pipes is communicated with the interior of the main body cavity, each of the magnetic shielding bent pipes is installed with a solenoid valve, and each of the solenoid valves is electrically connected to the main board, and a group of air outlet holes are provided on the side walls of the casing between each interface of each main board.

[0009] Preferably, the detection mechanism includes a plurality of insulating heat-conductive hollow blocks installed on the inner wall of the casing, and each insulating heat-conductive hollow block corresponds to the position of a corresponding air outlet, and each insulating heat-conductive hollow block is installed inside a thermistor, and each thermistor is electrically connected to the corresponding solenoid valve through a mainboard.

[0010] Preferably, the driving assembly includes two mounting plates fixedly mounted inside the mounting cavity, and a driving motor is commonly mounted on the two mounting plates, a moving gear is mounted on the output end of the driving motor, a static gear is fixedly sleeved on the shaft wall of the driving shaft, and the moving gear is meshed with the static gear, and the thermistor is connected in series with the driving motor through a main board.

[0011] Preferably, the transmission assembly includes gear plates fixedly sleeved on both ends of the drive shaft wall, the side walls of the two mounting plates are each provided with an annular groove, and the two gear plates are meshed with the groove walls of the annular groove on the same side.

[0012] Preferably, the early warning unit includes mounting blocks arranged on both sides of the moving gear, and the two mounting blocks are both installed inside the mounting cavity, a spotlight is fixedly installed on the side wall of one of the mounting blocks, and a photoelectric switch is installed on the side wall of the other mounting block, a light-transmitting hole is opened on the side wall of the moving gear, and the light emitted by the spotlight is irradiated to the photoelectric switch through the light-transmitting hole, the photoelectric switch and the spotlight are both electrically connected to the main board, a counting module is provided on the main board, and the photoelectric switch is electrically connected to the counting module through the main board.

[0013] Compared with the existing technology, the advantages of a network switch device are: 1. Through the cooperation of the casing, mainboard, partition, main cavity, installation cavity, heat dissipation channel and ventilation unit, the mainboard and its interfaces can be cooled and cooled. Through the cooperation of the exhaust unit and detection mechanism, the ventilation volume passing through various positions and interfaces of the mainboard can be automatically adjusted based on the different heat in different areas of the mainboard and at various interfaces of the mainboard. Therefore, under the same power consumption, the utilization rate of the heat dissipation airflow can be improved, and the heat dissipation efficiency can be higher.

[0014] 2. The dust-proof and dehumidification unit can remove dust and dehumidify the airflow entering the casing, and can cooperate with the driving structure of the ventilation unit to prevent dust from clogging the dust-proof mesh sleeve and ensure ventilation efficiency.

[0015] 3. Through the set early warning unit, the switch operation meter can be automatically measured based on the heat generated by the switch itself, and personnel can be reminded to perform maintenance on the switch in time to ensure the stable operation of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a network switch device provided by the present invention; Figure 2 It is a schematic diagram of the back structure of a network switch device provided by the present invention; Figure 3 It is a schematic diagram of the internal structure of a network switch device provided by the present invention from a top view; Figure 4 It is a structural schematic diagram of a ventilation unit of a network switch device provided by the present invention; Figure 5 It is a structural schematic diagram of a dust and moisture removal unit of a network switch device provided by the present invention; Figure 6 It is a structural schematic diagram of a detection mechanism of a network switch device provided by the present invention; Figure 7 The present invention provides a network switch device Figure 6 A magnified view of the structure of part A; Figure 8 The present invention provides a network switch device Figure 4 A magnified view of the structure of part B.

[0017] In the figure: 1 housing, 2 main board, 3 partition, 4 main cavity, 5 installation cavity, 6 heat dissipation channel, 7 ventilation unit, 71 drive shaft, 72 installation sleeve, 73 fan impeller, 74 air outlet duct, 8 dust and dehumidification unit, 81 strip hole, 82 installation plate, 83 fixing plate, 84 dust net sleeve, 85 dehumidification filler, 86 rubber frame strip, 9 exhaust unit, 91 magnetic shielding bent pipe, 92 solenoid valve, 93 air outlet, 10 detection mechanism, 101 insulating heat conductive hollow block, 102 thermistor, 11 early warning unit, 111 installation block, 112 spotlight, 113 photoelectric switch, 114 light transmission hole, 115 counting module, 12 drive assembly, 121 installation plate, 122 drive motor, 123 moving gear, 124 static gear, 13 transmission assembly, 131 gear plate, 132 annular groove. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] like Figure 1-Figure 8 As shown, a network switch device includes a housing 1 and a mainboard 2 installed inside the housing 1, and each interface of the mainboard 2 passes through the side wall of the housing 1. It also includes: two partitions 3, the two partitions 3 are fixedly installed inside the housing 1, and the two partitions 3 are arranged on one side of the mainboard 2. The two partitions 3 divide the interior of the housing 1 into a main cavity 4, an installation cavity 5 and a heat dissipation channel 6, and the mainboard 2 is installed inside the main cavity 4. The ventilation unit 7 is arranged inside the installation cavity 5 and is used to introduce external airflow into the interior of the housing 1. The ventilation unit Element 7 includes a driving shaft 71 rotatably arranged inside the installation cavity 5, and installation sleeves 72 are sleeved on the outer sides of both ends of the shaft wall of the driving shaft 71, and the two installation sleeves 72 are installed inside the installation cavity 5, and the shaft wall of the driving shaft 71 is located at one end inside the two installation sleeves 72 and is fixedly sleeved with a fan impeller 73, and the side walls of the two installation sleeves 72 are located on the air outlet side of the fan impeller 73 on the same side and are fixedly plugged with an air outlet pipe 74, and the two air outlet pipes 74 are connected to the interior of the heat dissipation channel 6, and a driving component 12 is installed inside the installation cavity 5.

[0020] The driving assembly 12 includes two mounting plates 121 fixedly mounted inside the mounting cavity 5, and a driving motor 122 is commonly mounted on the two mounting plates 121, a moving gear 123 is mounted on the output end of the driving motor 122, a stationary gear 124 is fixedly sleeved on the shaft wall of the driving shaft 71, and the moving gear 123 is meshed with the stationary gear 124, and the thermistor 102 is connected in series with the driving motor 122 through the main board 2.

[0021] The dustproof and dehumidification unit 8 is installed on the side wall of the casing 1 and is connected to the air inlet end of the ventilation unit 7. The dustproof and dehumidification unit 8 includes a strip hole 81 opened on the side wall of the casing 1, and two mounting plates 82 are rotatably provided inside the strip hole 81. The side walls of the two mounting plates 82 facing downward are both provided with removable fixed plates 83, and the outer sides of the two fixed plates 83 are jointly sleeved with a removable dustproof mesh sleeve 84, the interior of the dustproof mesh sleeve 84 is filled with dehumidification filler 85, and the driving shaft 71 is installed with a transmission assembly 13 for driving the two mounting plates 82 to rotate. Two rubber frame strips 86 are fixedly installed on the hole wall of the strip hole 81, and the inner walls of the two rubber frame strips 86 are in contact with the outer wall of the dustproof mesh sleeve 84. The rubber frame strips 86 can scrape off the dust attached to the side wall of the dustproof mesh sleeve 84 to prevent dust from clogging the dustproof mesh sleeve 84.

[0022] The transmission assembly 13 includes gear plates 131 fixedly sleeved on both ends of the shaft wall of the driving shaft 71. The side walls of the two mounting plates 82 are both provided with an annular groove 132, and the two gear plates 131 are meshed with the groove wall of the annular groove 132 on the same side.

[0023] The exhaust unit 9 is installed inside the heat dissipation channel 6, and the exhaust unit 9 is connected with the air outlet end of the ventilation unit 7. The exhaust unit 9 includes a plurality of magnetic shielding bent pipes 91 fixedly plugged into the side wall of the heat dissipation channel 6, and each magnetic shielding bent pipe 91 is connected with the interior of the main cavity 4. A solenoid valve 92 is installed inside each magnetic shielding bent pipe 91, and each solenoid valve 92 is electrically connected to the main board 2. A group of air outlet holes 93 are opened on the side wall of the casing 1 between each interface of each main board 2. The current passing through the electromagnetic component of the solenoid valve 92 increases, and the magnetic attraction force generated by the electromagnetic component of the solenoid valve 92 increases. At this time, the opening degree of the valve plate of the solenoid valve 92 increases.

[0024] The detection mechanism 10 is arranged inside the casing 1, and the detection mechanism 10 is electrically connected to the exhaust unit 9 and the ventilation unit 7. The detection mechanism 10 includes a plurality of insulating heat-conductive hollow blocks 101 installed on the inner wall of the casing 1, and each insulating heat-conductive hollow block 101 corresponds to the position of the corresponding air outlet 93. A thermistor 102 is installed inside each insulating heat-conductive hollow block 101, and each thermistor 102 is electrically connected to the corresponding solenoid valve 92 through the main board 2. When the temperature of the thermistor 102 increases, the resistance of the thermistor 102 will decrease.

[0025] The early warning unit 11 is installed inside the installation cavity 5. The early warning unit 11 includes installation blocks 111 arranged on both sides of the moving gear 123, and the two installation blocks 111 are both installed inside the installation cavity 5. A spotlight 112 is fixedly installed on the side wall of one of the installation blocks 111, and a photoelectric switch 113 is installed on the side wall of the other installation block 111. A light hole 114 is opened on the side wall of the moving gear 123, and the light emitted by the spotlight 112 is irradiated to the photoelectric switch 113 through the light hole 114. The photoelectric switch 113 and the spotlight 112 are both electrically connected to the main board 2. A counting module 115 is provided on the main board 2. The photoelectric switch 113 is electrically connected to the counting module 115 through the main board 2. The photoelectric switch 113 can convert the optical signal into an electrical signal and output it to the counting module 115. Each time the counting module 115 receives an electrical signal, it will increase the counting information once. When the counting information reaches the threshold, the counting module 115 will send an electrical signal to the main board 2, and the main board 2 will alarm through its own alarm module.

[0026] The operating principle of the present invention is now described as follows: insert the external optical fiber cable into the corresponding interface on the corresponding mainboard 2, then connect the power supply end of the mainboard 2 to the external power supply socket, then start the mainboard 2, and the switch starts to perform data exchange; After the mainboard 2 is started, the driving motor 122 will be synchronously controlled to work. The driving motor 122 can rotate the driving shaft 71 through the moving gear 123 and the static gear 124, thereby driving the two fan impellers 73 to rotate. Under the rotation of the two fan impellers 73, the external wind flow will be sucked in from the strip hole 81 and input into the heat dissipation channel 6 through the air outlet pipes 74 on the side walls of the two mounting sleeves 72. When the external air flow passes through the strip hole 81, it needs to pass through the dustproof mesh sleeve 84 and the dehumidification filler 85 inside it. Under the action of the dustproof mesh sleeve 84, the dust in the air flow will be intercepted on the outside of the dustproof mesh sleeve 84, and the moisture in the air flow will be absorbed and dried by the hygroscopic filler, thereby improving the cleanliness of the air flow in contact with the mainboard 2 and minimizing the impact of dust and moisture on the mainboard 2. Secondly, when the driving shaft 71 rotates, the gear plate 131 drives the two mounting plates 82 to rotate synchronously, thereby driving the dustproof net cover 84 to rotate. Under the action of the rubber frame strip 86, the dust on the outer wall of the dustproof net cover 84 will be scraped off, thereby preventing the dust from adhering to and clogging the dustproof net cover 84, ensuring that the dustproof net cover 84 continues to maintain good ventilation efficiency; The airflow entering the heat dissipation channel 6 will be discharged through each magnetic shielding bent pipe 91. The discharged airflow will flow through the mainboard 2 and then be discharged through the air outlet 93 at the corresponding position, so that the various interfaces of the mainboard 2 can be cooled. In actual work, when the interfaces on the mainboard 2 are not all connected, the interfaces that are not connected to the external optical fiber cable will not generate excessive heat because no signal and data interaction is performed. However, the interfaces connected to the external optical fiber cable will generate more heat because of the interaction of signals and data. When the data interaction flow is large, the photoelectric conversion module needs to process more optical signals, and the energy conversion process will be more frequent accordingly, and the heat generated will also increase accordingly, so the heat is higher. When the temperature rises, the temperature of the thermistor 102 at the corresponding position will rise. When the temperature of the thermistor 102 rises, its own resistance decreases. At this time, the current passed into the corresponding solenoid valve 92 becomes larger. Since the current passed into the electromagnetic component of the solenoid valve 92 becomes larger, the magnetic attraction generated by the electromagnetic component of the solenoid valve 92 becomes larger. At this time, the opening degree of the valve plate of the solenoid valve 92 becomes larger. Therefore, since the opening degree of the magnetic shielding elbow 91 becomes larger, more airflow will flow through the magnetic shielding elbow 91, and the opening degree of the magnetic shielding elbow 91 corresponding to the thermistor 102 with a lower temperature is smaller. Therefore, at the same power, more airflow passes through the area with a higher temperature, thereby improving the utilization rate of the heat dissipation airflow and improving the heat dissipation efficiency. When the temperature of the thermistor 102 increases, its own resistance decreases. At this time, the overall resistance of the connection loop of the thermistor 102 connected in series with the drive motor 122 decreases, so the current passing into the drive motor 122 increases, and the output power of the drive motor 122 increases. At this time, the speed of the drive shaft 71 increases, so the speed of the fan impeller 73 increases, thereby speeding up the flow rate of the airflow. When the temperature inside the mainboard 2 increases, the airflow speed will also increase synchronously to ensure that the heat dissipation requirements are met. Secondly, when the mainboard 2 controls the driving motor 122 to work, since the moving gear 123 rotates continuously, the light hole 114 will pass through the photoelectric switch 113 and the spotlight 112 at a certain frequency, and when the light hole 114 rotates to the position between the photoelectric switch 113 and the spotlight 112, the light emitted by the spotlight 112 will irradiate the photoelectric switch 113. At this time, the photoelectric switch 113 will convert the optical signal into an electrical signal and output it to the counting module 115. Each time the counting module 115 receives a closing electrical signal from the photoelectric switch 113, the count will be increased. When the temperature of the mainboard 2 rises, the operating burden of each component increases. At this time, the driving motor 122 drives the moving gear 123 to rotate at a speed greater than 0.01. Increase, so the frequency of the electrical signal output by the photoelectric switch 113 to the counting module 115 increases, so the counting speed of the counting module 115 becomes faster (that is, when the components of the mainboard 2 heat up, due to the increase in their operating burden, the time interval for their maintenance needs to be shortened, and by increasing the counting speed of the counting module 115, the need for shortening maintenance can be met), and after the counting module 115 reaches the threshold, it will remind the personnel to perform maintenance on the switch through the alarm module on the mainboard 2 (for example, replace the dehumidification filler 85, open the casing 1, and clean and maintain the mainboard 2), so that the time to remind the personnel to perform maintenance on the switch can be automatically adjusted based on the operating temperature of the mainboard 2, thereby ensuring the timeliness of maintenance.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A network switch device, comprising a housing (1) and a mainboard (2) installed inside the housing (1), wherein each interface of the mainboard (2) penetrates a side wall of the housing (1), and is characterized in that: Also includes: Two partitions (3) are fixedly mounted inside the housing (1), and the two partitions (3) are arranged on one side of the main board (2); the two partitions (3) separate the interior of the housing (1) into a main body cavity (4), an installation cavity (5) and a heat dissipation channel (6), and the main board (2) is mounted inside the main body cavity (4); A ventilation unit (7), arranged inside the installation cavity (5), and used for introducing external airflow into the interior of the housing (1); A dust-proof and dehumidification unit (8) is installed on the side wall of the housing (1) and is connected to the air inlet end of the ventilation unit (7); An exhaust unit (9) is installed inside the heat dissipation channel (6), and the exhaust unit (9) is connected to an air outlet end of the ventilation unit (7); A detection mechanism (10) is arranged inside the housing (1), and the detection mechanism (10) is electrically connected to the exhaust unit (9) and the ventilation unit (7); An early warning unit (11) is installed inside the installation cavity (5).

2. A network switch device according to claim 1, characterized in that: The ventilation unit (7) comprises a driving shaft (71) rotatably arranged inside the installation cavity (5), and mounting sleeves (72) are sleeved on the outer sides of both ends of the shaft wall of the driving shaft (71), and the two mounting sleeves (72) are installed inside the installation cavity (5), and the ends of the shaft wall of the driving shaft (71) located inside the two mounting sleeves (72) are fixedly sleeved with fan impellers (73), and the side walls of the two mounting sleeves (72) located on the same side of the air outlet end of the fan impeller (73) are fixedly plugged with air outlet pipes (74), and the two air outlet pipes (74) are connected to the inside of the heat dissipation channel (6), and a driving component (12) is installed inside the installation cavity (5).

3. A network switch device according to claim 2, characterized in that: The dustproof and dehumidifying unit (8) comprises a strip-shaped hole (81) formed on the side wall of the housing (1), and two mounting plates (82) are rotatably mounted inside the strip-shaped hole (81), and the side walls of the two mounting plates (82) facing downward are both mounted with detachable fixed plates (83), and the outer sides of the two fixed plates (83) are jointly sleeved with a detachable dustproof net sleeve (84), and the interior of the dustproof net sleeve (84) is filled with a dehumidifying filler (85), and the drive shaft (71) is mounted with a transmission assembly (13) for driving the two mounting plates (82) to rotate, and two rubber frame strips (86) are fixedly mounted on the hole wall of the strip-shaped hole (81), and the inner walls of the two rubber frame strips (86) are in contact with the outer side wall of the dustproof net sleeve (84).

4. A network switch device according to claim 2, characterized in that: The exhaust unit (9) comprises a plurality of magnetic shielding curved pipes (91) fixedly plugged into the side wall of the heat dissipation channel (6), and each magnetic shielding curved pipe (91) is connected to the interior of the main body cavity (4), and each magnetic shielding curved pipe (91) is installed with a solenoid valve (92) inside, and each solenoid valve (92) is electrically connected to the main board (2), and a group of air outlet holes (93) are opened on the side wall of the housing (1) at a position between each interface of each main board (2).

5. A network switch device according to claim 4, characterized in that: The detection mechanism (10) comprises a plurality of insulating heat-conducting hollow blocks (101) mounted on the inner wall of the housing (1), and each insulating heat-conducting hollow block (101) corresponds to the position of a corresponding air outlet (93), and each insulating heat-conducting hollow block (101) is internally mounted with a thermistor (102), and each thermistor (102) is electrically connected to a corresponding solenoid valve (92) via a mainboard (2).

6. A network switch device according to claim 5, characterized in that: The drive assembly (12) comprises two mounting plates (121) fixedly mounted inside the mounting cavity (5), and a drive motor (122) is mounted on the two mounting plates (121), a moving gear (123) is mounted on the output end of the drive motor (122), a stationary gear (124) is fixedly sleeved on the shaft wall of the drive shaft (71), and the moving gear (123) is meshed with the stationary gear (124), and the thermistor (102) is connected in series with the drive motor (122) via the main board (2).

7. A network switch device according to claim 3, characterized in that: The transmission assembly (13) comprises a gear plate (131) fixedly sleeved on both ends of the shaft wall of the drive shaft (71); the side walls of the two mounting plates (82) are each provided with an annular groove (132), and the two gear plates (131) are meshed with the groove wall of the annular groove (132) on the same side.

8. A network switch device according to claim 6, characterized in that: The early warning unit (11) comprises mounting blocks (111) arranged on both sides of a moving gear (123), and the two mounting blocks (111) are both mounted inside the mounting cavity (5), a spotlight (112) is fixedly mounted on the side wall of one of the mounting blocks (111), and a photoelectric switch (113) is mounted on the side wall of the other mounting block (111), a light transmission hole (114) is provided on the side wall of the moving gear (123), and light emitted by the spotlight (112) is irradiated to the photoelectric switch (113) through the light transmission hole (114), the photoelectric switch (113) and the spotlight (112) are both electrically connected to a main board (2), a counting module (115) is provided on the main board (2), and the photoelectric switch (113) is electrically connected to the counting module (115) via the main board (2).

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