Pulse-free diaphragm meter based on photoelectric direct reading technology

Abstract

The invention relates to the technical field of leather film meters, in particular to a pulse-free leather film meter based on the photoelectric direct reading technology, a photoelectric direct reading part comprises a plurality of number display parts, ten numbers from 0 to 9 are evenly and fixedly arranged on the outer rings of the number display parts from small to large, a light-emitting tube is fixedly arranged on the left side of each number display part, and a receiving tube is fixedly arranged on the right side of each number display part. A high-precision injection molding optical fiber is fixedly arranged in the middle of the light-emitting tube and the receiving tube, the light-emitting tube and the receiving tube are both fixedly arranged on the main PCB, and the main PCB is fixedly arranged in the photoelectric direct-reading part; when natural gas flows through the photoelectric direct reading part and the leather film meter body, the flowing natural gas generates pressure on the thin film in the leather film meter body and pushes the thin film to generate corresponding displacement, the thin film generates elastic deformation due to displacement, the displacement of the thin film is in direct proportion to the volume of the flowing natural gas, and the thin film pushes the character wheel part to rotate during displacement. The volume of the natural gas flowing through the leather film meter body is recorded, and the more the flowing natural gas is, the larger the rotation amplitude of the number display part is.

Description

Technical Field

[0001] The present invention relates to the technical field of membrane meters, in particular to a pulse-free membrane meter based on photoelectric direct reading technology. Background Art

[0002] A pulseless diaphragm meter based on photoelectric direct reading technology is a device used to measure the flow rate of fluids (such as water and gas). It combines the traditional diaphragm meter structure with modern photoelectric direct reading technology. The main feature of this type of meter is that it does not transmit data through mechanical pulse signals, but instead reads flow information directly through an optical sensor. Specifically, the working principle of this meter is as follows: Diaphragm meter: A diaphragm meter measures fluid volume by utilizing the elastic deformation of a thin film (diaphragm) when subjected to fluid pressure. As fluid passes through the meter, it pushes the diaphragm, and the amount of displacement is proportional to the volume of fluid flowing through it.

[0003] Photoelectric direct reading technology: To record the displacement of the membrane, traditional methods may rely on mechanical counters or pulse transmitters. However, in pulseless membrane meters based on photoelectric direct reading technology, optical sensors (such as grating encoders or LED / photodiode combinations) are used to detect changes in the membrane's position in a non-contact manner. These sensors can accurately capture changes in the membrane's position and convert them into digital signals.

[0004] Data Processing and Transmission: Captured data is typically processed by a built-in microprocessor and can be displayed directly on the instrument or sent to a remote monitoring system via a wired or wireless communication interface. The absence of mechanical pulse components reduces the risk of failure due to mechanical wear, improving reliability and accuracy.

[0005] The pulse-free membrane meter based on photoelectric direct reading technology has obvious advantages: fewer mechanical parts, lower maintenance requirements; improved measurement accuracy and stability; support for real-time data acquisition and remote monitoring; longer service life and higher reliability.

[0006] Traditional membrane meters cannot achieve contactless remote transmission of data and require mechanical pulse components for processing, which is prone to failure risks due to mechanical wear. Summary of the Invention

[0007] The main purpose of the present invention is to provide a pulse-free membrane meter based on photoelectric direct reading technology to solve the problem proposed in the related art that the membrane meter cannot realize contactless remote transmission of data.

[0008] To achieve the above object, according to one aspect of the present invention, a pulse-free membrane meter based on photoelectric direct reading technology is provided, comprising: a membrane surface portion, the membrane surface portion being used to accommodate a photoelectric direct reading frame portion and to guide natural gas from a municipal pipeline network to a gas-using device; A photoelectric direct reading frame, wherein the photoelectric direct reading frame is used to accommodate the photoelectric direct reading unit and isolate the photoelectric direct reading unit from the outside world; The photoelectric direct reading unit includes several display units. The outer ring of the display unit is evenly fixed with ten numbers from 0 to 9 in ascending order. A light-emitting tube is fixed on the left side of the display unit, a receiving tube is fixed on the right side, and a high-precision injection-molded optical fiber is fixed in the middle. The light-emitting tube and the receiving tube are both fixed on the main PCB, and the main PCB is fixed in the photoelectric direct reading unit. When natural gas flows through the photoelectric direct reading unit, the pressure generated by the natural gas flow drives the display unit to rotate. The more natural gas flows through, the greater the amplitude of the rotation of the display unit, and the larger the number facing the outside world. The light-emitting tube emits a light signal, which forms an optical path through the high-precision injection-molded optical fiber and is received by the receiving tube. The number of the display unit is identified by a 5-bit Gray code, and the identification result is displayed on the Gongzun remote transmission terminal; The Gongzun remote transmission terminal is connected to the photoelectric direct reading unit through a signal line and is used to display the natural gas flow recorded by the display unit.

[0009] Furthermore, the membrane surface includes a membrane meter body, a reading screen, an air inlet and an air outlet. The air outlet is fixedly arranged on the right side of the top of the membrane meter body, and is used to introduce the natural gas in the membrane meter body into the gas-using equipment. The air inlet is fixedly arranged on the left side of the top of the membrane meter body, and is used to introduce the natural gas in the municipal pipeline network into the membrane meter body. The reading screen is fixedly arranged in the middle of the front of the membrane meter body, and is used to read the value of the photoelectric direct reading part.

[0010] Furthermore, the photoelectric direct reading frame includes a photoelectric direct reading frame, a communication interface, a fixed block and a plurality of slots. The communication interface is fixed on the right side of the top of the photoelectric direct reading frame, and the fixed block is fixed on the right side of the photoelectric direct reading frame. The photoelectric direct reading frame is fixed in the membrane watch body by the fixed block. The slots are all provided on the front of the photoelectric direct reading frame for accommodating the display part.

[0011] Furthermore, the Gongzun remote transmission terminal includes a Gongzun remote transmission terminal body and a display screen, wherein the display screen is fixedly arranged on the front of the Gongzun remote transmission terminal body and is used to display the numbers read by the Gongzun remote transmission terminal body.

[0012] Furthermore, the photoelectric direct reading unit further includes a photoelectric direct reading body, a connection group and a fixing group. The connection group includes a terminal and a plurality of grooves. The fixing group includes a first clamping block and a second clamping block.

[0013] Furthermore, the connection terminal is fixed on the left side of the top of the photoelectric direct-reading body, the first card block is fixed on the right side of the photoelectric direct-reading body, and the second card block is fixed on the left side of the photoelectric direct-reading body. The grooves are all provided on the front side of the photoelectric direct-reading body, and the photoelectric direct-reading body is fixed in the photoelectric direct-reading frame by the first card block and the second card block.

[0014] Furthermore, the number display part includes a support group and a rotation group, the support group includes two annular blocks, a first bracket and a second bracket, and the rotation group includes a character wheel part and a character wheel shaft.

[0015] Furthermore, the character wheel shaft passes through the character wheel portion and is fixedly connected to the character wheel portion. The two annular blocks are rotatably sleeved on the outer ring of the character wheel shaft and are located on both sides of the character wheel portion. The first bracket is arranged on the left side of the character wheel portion and is fixedly connected to the annular block. The second bracket is arranged on the right side of the character wheel portion and is fixedly connected to the annular block.

[0016] Furthermore, the character wheel portion includes an axis wheel group, a light-transmitting slot group and a carry tooth group, the axis wheel group includes an outer wheel, an inner wheel and an axis wheel, the light-transmitting slot group includes a plurality of first light-transmitting slots and a plurality of second light-transmitting slots, and the carry tooth group includes a plurality of active carry teeth and a plurality of driven carry teeth.

[0017] Furthermore, the inner wheel is fixedly arranged at the middle of the inner side of the outer wheel, the shaft wheel is fixedly arranged at the middle of the inner wheel, the character wheel shaft passes through the shaft wheel and is fixedly connected to the shaft wheel, the first light-transmitting grooves are all arranged through the outer side of the inner wheel, the second light-transmitting grooves are all arranged through the inner side of the inner wheel, the active carry teeth are all fixedly arranged on the left side of the outer wheel, and the driven carry teeth are all fixedly arranged on the right side of the outer wheel.

[0018] Compared with the prior art, the present invention has the following beneficial effects: when natural gas flows through the photoelectric direct reading part, when natural gas flows through the membrane meter body, the flowing natural gas generates pressure on the thin film in the membrane meter body and pushes the thin film to produce corresponding displacement. The thin film undergoes elastic deformation due to the displacement, and the displacement of the thin film is proportional to the volume of natural gas flowing through. When the thin film is displaced, it pushes the character wheel part to rotate, recording the volume of natural gas flowing through the membrane meter body. The more natural gas flows through, the greater the amplitude of rotation of the display part, and the larger the number facing the outside world. The light-emitting tube emits a light signal, which forms an optical path through the high-precision injection-molded optical fiber and is received by the receiving tube. The number of the display part is identified by a 5-bit Gray code, and the identification result is displayed on the Gongzun remote transmission terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 This is an overall schematic diagram of the photoelectric direct reading frame of the present invention; Figure 3 This is a schematic diagram of the structure of the photoelectric direct reading frame of the present invention; Figure 4 This is a schematic diagram of the connection between the photoelectric direct reading unit and the Gongzun remote transmission terminal of the present invention; Figure 5 This is a schematic structural diagram of the photoelectric direct reading unit of the present invention; Figure 6 This is a structural diagram of the display unit of the present invention; Figure 7 It is a structural diagram of the character wheel portion of the present invention.

[0020] Illustration: 1. Membrane surface; 11. Membrane meter body; 12. Reading screen; 13. Air inlet; 14. Air outlet; 2. Photoelectric direct reading frame; 21. Photoelectric direct reading frame body; 22. Communication interface; 23. Fixing block; 24. Notch; 3. Photoelectric direct reading unit; 31. Photoelectric direct reading body; 32. Terminal; 33. First clamping block; 34. Groove; 35. Second clamping block; 4. Gongzun remote transmission terminal; 41. Gongzun remote transmission terminal body; 42. Display screen; 5. Signal line; 6. Display unit; 61. Character wheel unit; 62. Ring block; 63. Character wheel shaft; 64. First bracket; 65. Second bracket; 611. Outer wheel; 612. Inner wheel; 613. Shaft wheel; 614. First light-transmitting slot; 615. Second light-transmitting slot; 616. Active carry tooth; 617. Driven carry tooth. DETAILED DESCRIPTION

[0021] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0022] See also Figures 1 to 7 This embodiment provides a pulse-free membrane meter based on photoelectric direct reading technology, comprising: a membrane surface portion 1, the membrane surface portion 1 being used to accommodate a photoelectric direct reading frame portion 2 and to guide natural gas from a municipal pipeline network to a gas-using device; The photoelectric direct reading frame 2 is used to accommodate the photoelectric direct reading unit 3 and isolate the photoelectric direct reading unit 3 from the outside world; The photoelectric direct reading unit 3 includes a plurality of display units 6. The outer ring of the display unit 6 is evenly fixed with ten numbers from 0 to 9 in ascending order. A light-emitting tube is fixed on the left side of the display unit 6, a receiving tube is fixed on the right side, and a high-precision injection-molded optical fiber is fixed in the middle. The light-emitting tube and the receiving tube are both fixed on the main PCB, and the main PCB is fixed in the photoelectric direct reading unit 3. When natural gas flows through the photoelectric direct reading unit 3, the pressure generated by the natural gas flow pushes the display unit 6 to rotate. The more natural gas flows, the greater the amplitude of the rotation of the display unit 6, and the larger the number facing the outside world. The light-emitting tube emits a light signal, which forms an optical path through the high-precision injection-molded optical fiber and is received by the receiving tube. The number of the display unit 6 is identified by a 5-bit Gray code, and the identification result is displayed on the Gongzun remote transmission terminal 4. The Gongzun remote transmission terminal 4 is connected to the photoelectric direct reading unit 3 through a signal line 5 and is used to display the natural gas flow recorded by the display unit 6.

[0023] The membrane meter part 1 includes a membrane meter body 11, a reading screen 12, an air inlet 13 and an air outlet 14. The air outlet 14 is fixedly arranged on the right side of the top of the membrane meter body 11, and is used to introduce the natural gas in the membrane meter body 11 into the gas-using equipment. The air inlet 13 is fixedly arranged on the left side of the top of the membrane meter body 11, and is used to introduce the natural gas in the municipal pipeline network into the membrane meter body 11. The reading screen 12 is fixedly arranged in the middle of the front of the membrane meter body 11, and is used to read the value of the photoelectric direct reading part 3.

[0024] The photoelectric direct reading frame 2 includes a photoelectric direct reading frame 21, a communication interface 22, a fixing block 23 and several slots 24. The communication interface 22 is fixed on the top right side of the photoelectric direct reading frame 21, and the fixing block 23 is fixed on the right side of the photoelectric direct reading frame 21. The screws are screwed into the fixing block 23 and the membrane meter body 11, and the photoelectric direct reading frame 21 is fixed in the membrane meter body 11 through the fixing block 23. The slots 24 are all provided on the front of the photoelectric direct reading frame 21 for accommodating the display part 6.

[0025] The Gongzun remote transmission terminal 4 includes a Gongzun remote transmission terminal body 41 and a display screen 42 . The display screen 42 is fixedly arranged on the front of the Gongzun remote transmission terminal body 41 and is used to display the numbers read by the Gongzun remote transmission terminal body 41 .

[0026] The photoelectric direct reading unit 3 further includes a photoelectric direct reading body 31 , a connection group and a fixing group. The connection group includes a terminal 32 and a plurality of grooves 34 , and the fixing group includes a first clamping block 33 and a second clamping block 35 .

[0027] The connection terminal 32 is fixed on the top left side of the photoelectric direct-reading body 31, the first card block 33 is fixed on the right side of the photoelectric direct-reading body 31, the second card block 35 is fixed on the left side of the photoelectric direct-reading body 31, and the grooves 34 are all provided on the front side of the photoelectric direct-reading body 31. Card slots corresponding to the first card block 33 and the second card block 35 are provided in the photoelectric direct-reading frame 21. Insert the first card block 33 and the second card block 35 into the corresponding card slots to fix the photoelectric direct-reading body 31 in the photoelectric direct-reading frame 21.

[0028] The display unit 6 includes a support group and a rotation group. The support group includes two annular blocks 62 , a first bracket 64 and a second bracket 65 . The rotation group includes a character wheel unit 61 and a character wheel shaft 63 .

[0029] The character wheel shaft 63 passes through the character wheel portion 61 and is fixedly connected to the character wheel portion 61. The two annular blocks 62 are rotatably sleeved on the outer ring of the character wheel shaft 63 and are located on both sides of the character wheel portion 61. The first bracket 64 is provided on the left side of the character wheel portion 61 and is fixedly connected to the annular block 62. The second bracket 65 is provided on the right side of the character wheel portion 61 and is fixedly connected to the annular block 62. Through the first bracket 64 and the second bracket 65, the character wheel portion 61 is provided in the photoelectric direct reading portion 3 and is located in the groove 34.

[0030] The character wheel portion 61 includes a shaft wheel group, a light-transmitting slot group and a carry tooth group. The shaft wheel group includes an outer wheel 611, an inner wheel 612 and a shaft wheel 613. The light-transmitting slot group includes a plurality of first light-transmitting slots 614 and a plurality of second light-transmitting slots 615. The carry tooth group includes a plurality of active carry teeth 616 and a plurality of driven carry teeth 617.

[0031] The inner wheel 612 is fixedly disposed in the middle of the inner side of the outer wheel 611. The shaft wheel 613 is fixedly disposed in the middle of the inner wheel 612. The character wheel shaft 63 passes through the shaft wheel 613 and is fixedly connected to the shaft wheel 613. The first light-transmitting slots 614 are all provided through the outer side of the inner wheel 612. The second light-transmitting slots 615 are all provided through the inner side of the inner wheel 612. The active carry teeth 616 are all fixedly disposed on the left side of the outer wheel 611. The driven carry teeth 617 are all fixedly disposed on the right side of the outer wheel 611.

[0032] Connect the municipal natural gas pipeline with the air inlet 13, and then connect the air outlet 14 with the gas-consuming equipment. When the gas-consuming equipment starts to burn natural gas, the natural gas flows from the municipal pipeline through the membrane meter body 11 into the gas-consuming equipment. When the natural gas flows through the membrane meter body 11, the flowing natural gas generates pressure on the film in the membrane meter body 11 and pushes the film to produce corresponding displacement. The film undergoes elastic deformation due to the displacement. The displacement of the film is proportional to the volume of the natural gas flowing through. When the film is displaced, it pushes the character wheel part 61 to rotate to record the volume of the natural gas flowing through the membrane meter body 11. The 8 character wheel parts 61 are arranged in sequence, one by one from right to left. When the number displayed on the character wheel part 61 on the right exceeds 9, the number displayed on the character wheel part 61 returns to 0, and the number on the character wheel part 61 on the left is increased by 1. When the number displayed on the character wheel part 61 on the left exceeds 9, the number displayed on the character wheel part 61 returns to 0, and the number on the character wheel part 61 on the left is increased by 1. , and so on, the volume of natural gas used by the gas-consuming equipment is recorded; the light-emitting tube on the left side of the character wheel portion 61 emits a light signal, which passes through the high-precision injection-molded optical fiber at the character wheel portion 61 to form an optical path, and the receiving tube on the right side of the character wheel portion 61 recognizes the character wheel number through a 5-bit Gray code, and transmits the recognition result to the Gongzun remote transmission terminal 4 through the terminal 32, and displays it on the display screen 42. By reading the value on the display screen 42, you can know how much natural gas the gas-consuming equipment has used in total; after placing the photoelectric direct reading part 3 into the photoelectric direct reading frame portion 2, connect the terminal 32 to the communication interface 22 through the signal line 5, and then connect the communication interface 22 to the Gongzun remote transmission terminal 4, and the gas consumption can also be displayed on the display screen 42. The photoelectric direct reading frame portion 2 protects the photoelectric direct reading part 3, isolates it from the outside world, prevents it from being damaged by external forces, prolongs its service life, and also avoids external forces affecting the rotation of the character wheel portion 61, causing the measurement result to deviate from the actual value.

[0033] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. Pulse-free membrane meter based on photoelectric direct reading technology, characterized by: include: A membrane surface portion (1), the membrane surface portion (1) is used to accommodate a photoelectric direct reading frame portion (2) and to guide natural gas from a municipal pipe network to gas-using equipment; A photoelectric direct reading frame (2), wherein the photoelectric direct reading frame (2) is used to accommodate the photoelectric direct reading portion (3) and isolate the photoelectric direct reading portion (3) from the outside world; A photoelectric direct reading unit (3), the photoelectric direct reading unit (3) includes a plurality of display units (6), the outer ring of the display unit (6) is evenly fixed with ten numbers 0 to 9 in order from small to large, the left side of the display unit (6) is fixed with a light-emitting tube, the right side is fixed with a receiving tube, and the middle is fixed with a high-precision injection-molded optical fiber, the light-emitting tube and the receiving tube are both fixed on the main PCB, and the main PCB is fixed in the photoelectric direct reading unit (3), when natural gas flows through the photoelectric direct reading unit (3), the pressure generated by the natural gas flow pushes the display unit (6) to rotate, the more natural gas flows, the greater the amplitude of the rotation of the display unit (6), and the larger the number facing the outside, the light-emitting tube emits a light signal, forms an optical path through the high-precision injection-molded optical fiber, and is received by the receiving tube, the number of the display unit (6) is identified by a 5-bit Gray code, and the identification result is displayed on the Gongzun remote transmission terminal (4); A power remote transmission terminal (4) is connected to the photoelectric direct reading unit (3) via a signal line (5) and is used to display the natural gas flow recorded by the display unit (6).

2. The pulse-free membrane meter based on photoelectric direct reading technology according to claim 1 is characterized in that: The membrane meter part (1) includes a membrane meter body (11), a reading screen (12), an air inlet (13) and an air outlet (14), wherein the air outlet (14) is fixedly arranged on the right side of the top of the membrane meter body (11) and is used to introduce the natural gas in the membrane meter body (11) into the gas-using equipment, and the air inlet (13) is fixedly arranged on the left side of the top of the membrane meter body (11) and is used to introduce the natural gas in the municipal pipe network into the membrane meter body (11). The reading screen (12) is fixedly arranged in the middle of the front of the membrane meter body (11) and is used to read the value of the photoelectric direct reading part (3).

3. The pulse-free membrane meter based on photoelectric direct reading technology according to claim 2, characterized in that: The photoelectric direct reading frame (2) includes a photoelectric direct reading frame (21), a communication interface (22), a fixed block (23) and a plurality of notches (24), wherein the communication interface (22) is fixedly arranged on the right side of the top of the photoelectric direct reading frame (21), and the fixed block (23) is fixedly arranged on the right side of the photoelectric direct reading frame (21). The photoelectric direct reading frame (21) is fixed in the membrane meter body (11) by the fixed block (23), and the notches (24) are all arranged on the front of the photoelectric direct reading frame (21) for accommodating the display unit (6).

4. The pulse-free membrane meter based on photoelectric direct reading technology according to claim 1, characterized in that: The Gongzun remote transmission terminal (4) comprises a Gongzun remote transmission terminal body (41) and a display screen (42), wherein the display screen (42) is fixedly arranged on the front of the Gongzun remote transmission terminal body (41) and is used to display the numbers read by the Gongzun remote transmission terminal body (41).

5. The pulse-free membrane meter based on photoelectric direct reading technology according to claim 3 is characterized in that: The photoelectric direct reading portion (3) further comprises a photoelectric direct reading body (31), a connection group and a fixing group, wherein the connection group comprises a terminal (32) and a plurality of grooves (34), and the fixing group comprises a first clamping block (33) and a second clamping block (35).

6. The pulse-free membrane meter based on photoelectric direct reading technology according to claim 5, characterized in that: The connection terminal (32) is fixedly arranged on the left side of the top of the photoelectric direct reading body (31), the first card block (33) is fixedly arranged on the right side of the photoelectric direct reading body (31), and the second card block (35) is fixedly arranged on the left side of the photoelectric direct reading body (31). The grooves (34) are all arranged on the front side of the photoelectric direct reading body (31), and the photoelectric direct reading body (31) is fixed in the photoelectric direct reading frame (21) by the first card block (33) and the second card block (35).

7. The pulse-free membrane meter based on photoelectric direct reading technology according to claim 1 is characterized in that: The display part (6) comprises a support group and a rotation group, wherein the support group comprises two annular blocks (62), a first bracket (64) and a second bracket (65), and the rotation group comprises a character wheel part (61) and a character wheel shaft (63).

8. The pulse-free membrane meter based on photoelectric direct reading technology according to claim 7, characterized in that: The character wheel shaft (63) passes through the character wheel portion (61) and is fixedly connected to the character wheel portion (61). The two annular blocks (62) are rotatably sleeved on the outer ring of the character wheel shaft (63) and are located on both sides of the character wheel portion (61). The first bracket (64) is located on the left side of the character wheel portion (61) and is fixedly connected to the annular block (62). The second bracket (65) is located on the right side of the character wheel portion (61) and is fixedly connected to the annular block (62).

9. The pulse-free membrane meter based on photoelectric direct reading technology according to claim 7, characterized in that: The character wheel portion (61) comprises a shaft wheel group, a light-transmitting slot group and a carry tooth group, wherein the shaft wheel group comprises an outer wheel (611), an inner wheel (612) and a shaft wheel (613), the light-transmitting slot group comprises a plurality of first light-transmitting slots (614) and a plurality of second light-transmitting slots (615), and the carry tooth group comprises a plurality of active carry teeth (616) and a plurality of driven carry teeth (617).

10. The pulse-free membrane meter based on photoelectric direct reading technology according to claim 9, characterized in that: The inner wheel (612) is fixedly arranged at the middle of the inner side of the outer wheel (611), the shaft wheel (613) is fixedly arranged at the middle of the inner wheel (612), the character wheel shaft (63) passes through the shaft wheel (613) and is fixedly connected to the shaft wheel (613), the first light-transmitting grooves (614) are all arranged through the outer side of the inner wheel (612), the second light-transmitting grooves (615) are all arranged through the inner side of the inner wheel (612), the active carry teeth (616) are all fixedly arranged on the left side of the outer wheel (611), and the driven carry teeth (617) are all fixedly arranged on the right side of the outer wheel (611).

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