A detection device for detecting total organic carbon content in drinking water

Abstract

The application relates to the technical field of total organic carbon content detection, in particular to a detection device for detecting total organic carbon content in drinking water, which comprises a box body, a combustion chamber, a transition chamber and a temperature rising chamber are sequentially arranged in the box body, a rotary combustor and a translation assembly are arranged in the box body, the rotary combustor reciprocally moves in the combustion chamber, the transition chamber and the temperature rising chamber through the translation assembly, a to-be-detected water inlet pipe and an oxygen inlet pipe are arranged in the combustion chamber, the to-be-detected water inlet pipe faces the rotary combustor, a driving assembly is arranged below the box body, the driving assembly is used for driving the rotary combustor to rotate in the combustion chamber, and a vacuum pump for vacuumizing the transition chamber and the combustion chamber is connected with the transition chamber and the combustion chamber. The application has the effect of improving the combustion efficiency of to-be-detected water.

Description

Technical Field

[0001] This application relates to the technical field of total organic carbon content detection, and more particularly to a detection device for detecting total organic carbon content in drinking water. Background Technology

[0002] Total organic carbon (TOC) refers to the total amount of carbon contained in dissolved and suspended organic matter in water. There are many types of organic matter in water, and currently, not all of them can be separated and identified. TOC is a comprehensive indicator for rapid detection. It expresses the total amount of organic matter in water by the amount of carbon. TOC detection can be performed using the combustion oxidation-non-dispersive infrared absorption method. First, the water sample to be tested is burned and fully oxidized. This requires burning the water sample in an environment above 600 degrees Celsius to generate carbon dioxide. Then, the concentration of carbon dioxide is detected, thus obtaining the TOC in the water.

[0003] A combustion furnace for determining total organic carbon is disclosed in the related technology, including a partition shell, an insulation layer located inside the partition shell, and a heating device located inside the insulation layer. The partition shell is located inside the closed combustion furnace chamber. An air outlet is provided above the side wall of the combustion furnace chamber, and a heat-conducting fan is provided on the air outlet. An air inlet is provided at the bottom of the combustion furnace chamber. An air gap for air flow is formed between the insulation layer and the partition shell. A furnace core through hole is formed through the center of the partition shell, the insulation layer, and the heating device. A combustion tube is provided in the furnace core through hole. One end of the combustion tube is an injection port, and the other end is an exhaust port. The water to be oxidized is injected through the injection port, and then the water to be oxidized is burned by the heating device. The generated gas is discharged from the exhaust port and enters the closed combustion furnace chamber.

[0004] However, in the above structure, the water to be tested is injected from top to bottom through the injection port, which is easily affected by the heating device, resulting in a slower combustion efficiency. Summary of the Invention

[0005] In order to improve the combustion efficiency of the water to be tested, this application provides a detection device for detecting the total organic carbon content in drinking water.

[0006] This application provides a detection device for detecting the total organic carbon content in drinking water, employing the following technical solution:

[0007] A detection device for detecting the total organic carbon content in drinking water includes a housing, within which a combustion chamber, a transition chamber, and a heating chamber are sequentially arranged. A rotary burner and a translation assembly are disposed within the housing, with the rotary burner reciprocating between the combustion chamber, transition chamber, and heating chamber via the translation assembly. A test water inlet pipe and an oxygen inlet pipe are disposed within the combustion chamber, with the test water inlet pipe facing the rotary burner. A drive assembly is disposed below the housing, used to drive the rotary burner to rotate within the combustion chamber. A vacuum pump is connected to the transition chamber and the combustion chamber for evacuating the transition chamber and the combustion chamber.

[0008] By adopting the above technical solution, during use, the translation component is used to connect the rotary burner. Under the action of the translation component, the rotary burner is first moved to the heating chamber to heat the rotary burner. Then, the rotary burner is moved to the transition chamber to isolate the carbon dioxide in the heating chamber before entering the combustion chamber. The drive component drives the rotary burner to rotate. The water to be tested in the combustion chamber flows out to the circumference of the rotary burner. This allows the rotary burner to rapidly react the water to be tested around the rotary burner, thereby improving the combustion efficiency of the water to be tested.

[0009] Preferably, the transition chamber includes a main body, with sealing doors at both ends of the main body. The main body is cylindrical and located inside the box, with a filling block used to seal the space between the outer side of the main body and the inner wall of the box.

[0010] By adopting the above technical solution, sealing doors are set at both ends of the main body, and the main body is set in a cylindrical shape inside the box. Thus, the separate setting of the main body inside the box makes the transition chamber better separated from the combustion chamber and heating chamber on both sides, reducing gas leakage.

[0011] Preferably, the translation component includes two screws, which are rotatably connected to the housing and pass through the combustion chamber, transition chamber and heating chamber in sequence, and the rotary burner is threadedly connected to the two screws.

[0012] By adopting the above technical solution, two screws are threadedly connected to the rotary burner. When the two screws rotate simultaneously, they can drive the rotary burner to move along the length of the screws, and the two screws can prevent the rotary burner from rotating with the screws.

[0013] Preferably, two sealing doors are symmetrically arranged at both ends of the main body. The two sealing doors are provided with clearance notches at the positions where they meet for sealing with the side wall of the screw. The screw is cylindrical at the part corresponding to the sealing door. The sealing door is rotatably connected to the main body by a hinge. A cylinder is provided inside the main body. One end of the cylinder is rotatably connected to the main body, and the other end is rotatably connected to the sealing door.

[0014] By adopting the above technical solution, two sealing doors are symmetrically arranged. The clearance notch on the sealing door is used to connect with the cylindrical part of the screw, so that when the screw passes through the transition chamber, the sealing door can seal the position of the screw and reduce air leakage at the screw.

[0015] Preferably, a base is provided below the housing, and the drive assembly includes a drive rod and a drive gear. The drive rod is rotatably mounted on the base, and the drive gear is coaxially fixed on the drive rod. There are two drive gears, which are located in the combustion chamber and the heating chamber, respectively. The two drive gears are used to drive the rotary burner to rotate.

[0016] By adopting the above technical solution, the drive rod is rotatably mounted on the base, and two drive gears are installed on the drive rod. The drive gears can drive the rotary burner to rotate in the combustion chamber, so that the water to be tested can be easily spread on the rotary burner. The drive gears can drive the rotary burner to rotate in the heating chamber, so that the rotary burner can be heated evenly.

[0017] Preferably, the rotary burner includes a rotating frame, a rotating support, and a driven gear. The rotating support is threaded onto a screw. The middle part of the rotating frame is rotatably connected to the rotating support. A heat storage block is provided inside the rotating frame. The driven gear is coaxially fixed with the rotating frame and one is provided at each end of the rotating frame. The driven gear is used to mesh with the driving gear.

[0018] By adopting the above technical solution, a heat storage block is set inside the rotating frame. The heat storage block is heated in the heating chamber, so that the heat of the heat storage block can evaporate and burn the water to be tested. Then, when the active gear drives the driven gear to rotate, the heat storage block can interact with the water to be tested in multiple places, thereby improving the combustion efficiency of the water to be tested.

[0019] Preferably, the rotary support has two threaded holes, which are respectively threaded to two screws, and the threads of the two screws are arranged in opposite directions. The ends of the two screws are provided with connecting gears, and the two connecting gears are externally meshed.

[0020] By adopting the above technical solution, the ends of the two screws are connected by connecting gears for transmission, and the two connecting gears mesh externally, thereby ensuring the transmission speed of the two screws. As a result, when the rotary support is threadedly connected to the screw, it ensures that the rotary support moves along the length direction of the screw.

[0021] Preferably, the power assembly on the housing includes a pulley, a drive motor, and a one-way bearing. The drive motor is fixed to the housing, and a pulley is fixedly mounted on the output shaft of the drive motor. A pulley is coaxially connected to the drive rod via a one-way bearing, and a pulley is coaxially connected to a screw via a one-way bearing. The three pulleys are connected by a transmission belt.

[0022] By adopting the above technical solution, the drive motor drives the screw or drive rod through the one-way bearing, so that when the drive motor drives the rotary burner to rotate, the circumferential direction of the rotary burner no longer rotates. When the rotary burner moves along the screw, there is no need to rotate the rotary burner, thus making it easier to control the state of the rotary burner.

[0023] Preferably, a storage box is provided inside the heating chamber, and a connecting pipe is provided between the storage box and the transition chamber, with a solenoid valve installed on the connecting pipe.

[0024] By adopting the above technical solution, the storage tank is located in the heating chamber. When the rotary burner is in the transition chamber, the gas in the storage tank enters the transition chamber through the connecting pipe, reducing the cooling of the rotary burner and ensuring that the rotary burner has high heat for burning the water to be tested.

[0025] Preferably, the outlet direction of the oxygen inlet pipe is perpendicular to the outlet direction of the water inlet pipe to be tested, and the oxygen inlet pipe faces the inlet of the water inlet pipe to be tested.

[0026] By adopting the above technical solution, the outlet direction of the oxygen inlet pipe is perpendicular to the outlet direction of the water inlet pipe. The oxygen in the oxygen inlet pipe can disperse the water to be tested and blow it toward the rotary burner, which can facilitate the rapid reaction of oxygen with organic carbon in the water to be tested.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By driving the rotary burner to rotate through the drive component, the water to be tested in the combustion chamber is discharged to the circumference of the rotary burner, so that the rotary burner can quickly react with the water to be tested around the rotary burner, thereby improving the combustion efficiency of the water to be tested.

[0029] 2. The drive gear in the combustion chamber can drive the rotary burner to rotate, making it easier to spread the water to be tested onto the rotary burner. The drive gear in the heating chamber can also drive the rotary burner to rotate, so that the rotary burner can be heated evenly.

[0030] 3. A heat storage block is installed inside the rotating frame. The heat storage block is heated in the heating chamber, so that the heat of the heat storage block can evaporate and burn the water to be tested. In this way, the heat storage block can interact with the water to be tested in multiple places, thereby improving the combustion efficiency of the water to be tested. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the internal structure of an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the structure of the body in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the internal structure of the main body in an embodiment of this application;

[0034] Figure 4 This is a structural schematic diagram of an embodiment of this application, omitting the box body.

[0035] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Combustion chamber; 12. Transition chamber; 121. Main body; 122. Filler block; 123. Hinge; 124. Cylinder; 13. Heating chamber; 14. Sealing door; 141. Clearance notch; 2. Rotary burner; 21. Rotating frame; 22. Rotary support; 221. Threaded hole; 23. Driven gear; 24. Heat storage block; 3. Gas stove; 41. Water inlet pipe to be tested; 42. Oxygen inlet pipe ; 43. Carbon dioxide sensor; 5. Translation assembly; 51. Screw; 6. Base; 61. Partition; 62. Vacuum pump; 63. Branch pipe; 64. Solenoid control valve; 7. Storage tank; 71. Connecting pipe; 72. Solenoid valve; 8. Drive assembly; 81. Drive rod; 82. Drive gear; 9. Power assembly; 91. Pulley; 92. Drive motor; 93. One-way bearing; 94. Transmission belt; 95. Connecting gear. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0037] This application discloses a detection device for detecting the total organic carbon content in drinking water, with reference to... Figure 1The system includes a housing 1, which is a sealed structure. The inner wall of the housing 1 can be made of thermal insulation material. Inside the housing 1, a combustion chamber 11, a transition chamber 12, and a heating chamber 13 are arranged horizontally in sequence. The transition chamber 12 is located on the side of the combustion chamber 11 and the heating chamber 13 and has a sealed door 14. The sealed door 14 separates the combustion chamber 11, the transition chamber 12, and the heating chamber 13, placing them in sealed spaces. A rotary burner 2 is installed inside the housing 1, and the rotary burner 2 can pass sequentially through the combustion chamber 11, the transition chamber 12, and the heating chamber 13 along the length of the housing 1. When the rotary burner 2 is inside the heating chamber 13, a gas stove 3 is installed inside the heating chamber 13 to heat the rotary burner 2. Then, in the transition chamber 12, carbon dioxide gas carried by the rotary burner 2 in the heating chamber 13 is isolated, reducing the amount of carbon dioxide entering the combustion chamber 11. The gas then reaches the combustion chamber 11, where a test water inlet pipe 41 and an oxygen inlet pipe 42 are installed. The test water inlet pipe 41 delivers the test water to the rotary burner 2 in the combustion chamber 11, and the oxygen inlet pipe 42 introduces oxygen for combustion. The combustion gases are all contained within the sealed combustion chamber 11. Multiple carbon dioxide sensors 43 are installed in the combustion chamber 11 to detect the carbon dioxide concentration, thus enabling the measurement of the total organic carbon content in the test water. Multiple carbon dioxide sensors 43 are arranged at multiple locations within the combustion chamber 11. During the measurement process, the readings of the multiple carbon dioxide sensors 43 are recorded when they are relatively close to each other, so that the concentration of carbon dioxide in the combustion chamber 11 is relatively uniform, thereby making the recorded data more accurate.

[0038] refer to Figure 1 A translation assembly 5 is installed inside the housing 1. The translation assembly 5 includes two screws 51, which pass through the combustion chamber 11, the transition chamber 12, and the heating chamber 13 in sequence, and are arranged in parallel. The rotary burner 2 is mounted on the two screws 51, and is moved along the length of the screws 51 by the action of the two screws 51, thereby circulating the rotary burner 2 within the combustion chamber 11, the transition chamber 12, and the heating chamber 13.

[0039] refer to Figure 1A base 6 is located below the housing 1. A partition 61 is installed inside the base 6, dividing the housing into multiple enclosed chambers. A vacuum pump 62 is also installed inside the base 6. The vacuum pump 62 is connected to the combustion chamber 11 and the transition chamber 12 to evacuate these chambers. The vacuum pump 62 has two branch pipes 63 at its pumping end. Each branch pipe 63 is equipped with an electromagnetic control valve 64. The ends of the two branch pipes 63 furthest from the vacuum pump 62 are connected to the combustion chamber 11 and the transition chamber 12, respectively, thus enabling the vacuum pump 62 to evacuate the combustion chamber 11 and the transition chamber 12.

[0040] refer to Figure 2 and Figure 3 To improve the sealing between the transition chamber 12 and the adjacent combustion chamber 11 and heating chamber 13, the transition chamber 12 includes a cylindrical body 121. Sealing doors 14 are installed at both ends of the body 121, and filling blocks 122 are placed between the outer wall of the body 121 and the inner wall of the housing 1 for sealing. Because the body 121 is sealed by the sealing doors 14, the transition chamber 12 is isolated within the housing 1, thus providing better isolation between the combustion chamber 11 and the heating chamber 13 and reducing gas leakage between them. Two sealing doors 14 are provided at each end of the body 121, symmetrically arranged and opening opposite each other. A clearance notch 141 is provided at a position opposite to the sealing door 14. The clearance notch 141 is directly opposite to the two screws 51, so that when the sealing door 14 is closed, the clearance notch 141 is stuck on the outer wall of the screw 51. The screw 51 at the position of the clearance notch 141 is cylindrical and its diameter is smaller than the diameter of the threaded part of the screw 51, which facilitates the sealing of the contact position between the sealing door 14 and the screw 51.

[0041] refer to Figure 2 and Figure 3 A hinge 123 is provided between the sealing door 14 and the body 121. The hinge 123 is positioned so that the sealing door 14 is engaged with the other two sealing doors 14, and the sealing door 14 is rotatably connected to the body 121 via the hinge 123. A cylinder 124 is provided inside the body 121. One end of the cylinder 124 is rotatably connected to the sealing door 14, and the other end is rotatably connected to the body 121, so that the cylinder 124 can drive the sealing door 14 to open or close. When the sealing door 14 is rotated outward by the cylinder 124, it opens, allowing the rotary burner 2 to enter into or exit the transition chamber 12.

[0042] refer to Figure 1 and Figure 4A storage tank 7 for storing nitrogen or oxygen is also installed inside the heating chamber 13. The storage tank 7, located within the heating chamber 13, can raise the temperature of the gas inside as the rotary burner 2 is heated. A connecting pipe 71 is installed between the storage tank 7 and the transition chamber 12, and a solenoid valve 72 is installed on the connecting pipe 71 to open and close it. After the rotary burner 2 is heated to the designed temperature in the heating chamber 13, the sealing door 14 of the transition chamber 12 near the heating chamber 13 is opened. Then, the rotary burner 2 is moved from the heating chamber 13 to the transition chamber 12 via the translation component 5. After closing the sealing door 14, a vacuum pump 62 is used to evacuate the gas in the transition chamber 12, removing the carbon dioxide that entered the transition chamber 12 from the heating chamber 13. Simultaneously, a vacuum is evacuated from the combustion chamber 11 to remove the carbon dioxide from the previous experiment. After completing one vacuum pump cycle, the connecting pipe 71 is opened to allow heated nitrogen or oxygen to enter the transition chamber 12, reducing the cooling effect on the rotary burner 2. At the same time, oxygen is introduced into the combustion chamber 11 to replace the gas removed by the vacuum pump 62, and then the vacuum is drawn again. This process is repeated at least twice to minimize the impact of carbon dioxide in the combustion chamber 11 and transition chamber 12 on the measured carbon dioxide concentration.

[0043] refer to Figure 4 A drive assembly 8 is provided inside the base 6. The drive assembly 8 is used to drive the rotary burner 2 to rotate. The drive assembly 8 includes a drive rod 81 and a drive gear 82. The drive rod 81 is arranged parallel to the screw 51 and is rotatably mounted on the base 6. The drive gear 82 is coaxially fixed on the drive rod 81, and there are two drive gears 82. The two drive gears 82 are located in the heating chamber 13 and the combustion chamber 11, respectively. When the drive rod 81 rotates, it drives the drive gears 82 to rotate, and the drive gears 82 are used to rotate the rotary burner 2.

[0044] refer to Figure 4The rotary burner 2 includes a rotating frame 21, a rotating support 22, and a driven gear 23. The rotating frame 21 can be made of high-temperature resistant ceramic material. The rotating support 22 is located at the center of the rotating frame 21, and the rotating frame 21 is rotatably connected to the rotating support 22. The peripheral wall of the rotating frame 21 has a hollow structure. The interior of the rotating frame 21 is filled with heat storage blocks 24. The heat storage blocks 24 can be made of irregular stones or heat-resistant bricks. The driven gear 23 is coaxially fixed on the rotating frame 21, and there is a driven gear 23 at each end of the rotating frame 21. The two driven gears 23 are used to mesh one-to-one with the two driving gears 82, so that when the driving gears 82 rotate, they can drive the rotating frame 21 to rotate on the rotating support 22. Two threaded holes 221 are provided on the slewing support 22 parallel to the axis of the slewing support 22. The two threaded holes 221 are threadedly connected to two screws 51 respectively. In this embodiment, the two screws 51 are arranged with opposite threads, so that when the two screws 51 rotate in opposite directions, they can drive the slewing support 22 to move along the length of the screws 51.

[0045] refer to Figure 1 and Figure 4 A power assembly 9 is fixedly installed at one end of the housing 1. The power assembly 9 includes a pulley 91, a drive motor 92, and a one-way bearing 93. The drive motor 92 is fixed to the outer wall of the housing 1. A pulley 91 is coaxially fixed on the output shaft of the drive motor 92. Pulleys 91 are also installed on the drive rod 81 and a screw 51. The three pulleys 91 are rotatably connected by a transmission belt 94. A one-way bearing 93 connects the pulley 91 on the screw 51 to the screw 51. The pulley 91 and the drive rod 81 are also connected by a one-way bearing 93, and the two one-way bearings 93 have opposite transmission directions, so that when the drive motor 92 rotates forward, it drives the screw 51 alone, and when the drive motor 92 rotates in reverse, it drives the drive rod 81 alone. A connecting gear 95 is installed on the same end of both screws 51. The two connecting gears 95 mesh externally, so that the rotation directions of the two screws 51 are opposite. When the drive motor 92 drives the pulley 91 on the screw 51, one screw 51 drives the other screw 51 to rotate. One end of the water inlet pipe 41 extends to the side wall of the rotating frame 21. The outlet direction of the oxygen inlet pipe 42 is perpendicular to the outlet direction of the water inlet pipe 41 and the oxygen inlet pipe 42 faces the opening of the water inlet pipe 41. During the oxygen inflow, the water to be tested is dispersed onto the heat storage block 24 in the rotating frame 21 and rapidly evaporated and burned by the temperature of the heat storage block 24. Since the rotating frame 21 rotates in the combustion chamber 11 under the drive of the drive component 8, the water to be tested can be dispersed along the outer peripheral wall of the rotating frame 21, thereby improving the combustion efficiency of the water to be tested.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A detection device for detecting the total organic carbon content in drinking water, characterized in that: The device includes a housing (1), which contains a combustion chamber (11), a transition chamber (12), and a heating chamber (13) arranged in sequence. A rotary burner (2) and a translation component (5) are installed inside the housing (1). The rotary burner (2) moves back and forth between the combustion chamber (11), the transition chamber (12), and the heating chamber (13) via the translation component (5). A test water inlet pipe (41) and an oxygen inlet pipe (42) are installed inside the combustion chamber (11), with the test water inlet pipe (41) facing the rotary burner (2). A drive component (8) is installed below the housing (1) to drive the rotary burner (2) to rotate inside the combustion chamber (11). A vacuum pump (62) is connected between the transition chamber (12) and the combustion chamber (11) to evacuate the transition chamber (12) and the combustion chamber (11). The transition chamber (12) includes a main body (121), and sealing doors (14) are provided at both ends of the main body (121). The main body (121) is cylindrical and located inside the box (1). A filling block (122) is provided between the outer side of the main body (121) and the inner wall of the box (1) for sealing. The translation component (5) includes two screws (51), which are rotatably connected to the housing (1) and pass through the combustion chamber (11), the transition chamber (12) and the heating chamber (13) in sequence. The rotary burner (2) is threadedly connected to the two screws (51). Two sealing doors (14) are symmetrically arranged at both ends of the main body (121). The two sealing doors (14) are provided with clearance notches (141) for sealing with the side wall of the screw (51) at the position where they meet. The screw (51) is cylindrical in shape corresponding to the sealing door (14). The sealing door (14) is rotatably connected to the main body (121) by a hinge (123). A cylinder (124) is provided inside the main body (121). One end of the cylinder (124) is rotatably connected to the main body (121), and the other end is rotatably connected to the sealing door (14). The rotary burner (2) includes a rotary support (22), on which two threaded holes (221) are provided. The two threaded holes (221) are respectively threaded to two screws (51), and the threads of the two screws (51) are arranged in opposite directions. The ends of the two screws (51) are provided with connecting gears (95), and the two connecting gears (95) are externally meshed. The heating chamber (13) is equipped with a storage box (7), and a connecting pipe (71) is provided between the storage box (7) and the transition chamber (12). A solenoid valve (72) is installed on the connecting pipe (71). The outlet direction of the oxygen inlet pipe (42) is perpendicular to the outlet direction of the water inlet pipe (41) to be tested, and the oxygen inlet pipe (42) faces the inlet of the water inlet pipe (41) to be tested.

2. The detection device for detecting the total organic carbon content in drinking water according to claim 1, characterized in that: The housing (1) is provided with a base (6) below it. The drive assembly (8) includes a drive rod (81) and a drive gear (82). The drive rod (81) is rotatably mounted on the base (6). The drive gear (82) is coaxially fixed on the drive rod (81). There are two drive gears (82). The two drive gears (82) are located in the combustion chamber (11) and the heating chamber (13) respectively. The two drive gears (82) are used to drive the rotary burner (2) to rotate.

3. The detection device for detecting the total organic carbon content in drinking water according to claim 2, characterized in that: The rotary burner (2) also includes a rotating frame (21) and a driven gear (23). The middle part of the rotating frame (21) is rotatably connected to the rotating support (22). A heat storage block (24) is provided inside the rotating frame (21). The driven gear (23) is coaxially fixed with the rotating frame (21) and one is provided at each end of the rotating frame (21). The driven gear (23) is used to mesh with the driving gear (82).

4. The detection device for detecting the total organic carbon content in drinking water according to claim 3, characterized in that: The power assembly (9) on the housing (1) includes a pulley (91), a drive motor (92) and a one-way bearing (93). The drive motor (92) is fixed on the housing (1), and a pulley (91) is fixedly installed on the output shaft of the drive motor (92). A pulley (91) is coaxially connected to the drive rod (81) through the one-way bearing (93). A pulley (91) is coaxially connected to a screw (51) through the one-way bearing (93). The three pulleys (91) are connected by a transmission belt (94).

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