An integrated domestic water purification and treatment equipment

Abstract

The present invention provides an integrated domestic water purification and treatment device, which relates to the field of water treatment technology and includes a treatment tank, a collection mechanism for dumping sewage, a feeding mechanism for adding treatment agents, the collection mechanism including a throat, an adjustment ball, and a damper, and the feeding mechanism including a double-sided rack, a medicine storage box, and a valve plate. This device is equipped with a double-sided rack, a first connecting rod, a second connecting rod, and a third connecting rod, which cooperate with each other. When the adjustment ball moves downward, it drives the double-sided rack downward, causing the valve plate to rotate and open, thereby matching the flow rate of the added agent with the flow rate of the sewage, ensuring the response requirements of the sewage treatment, and simultaneously achieving the addition of small amounts of agents multiple times without manual intervention. The amount of agent added can be adjusted in real time according to the flow rate of domestic sewage, avoiding insufficient treatment speed when the sewage flow rate is large, and waste of agents or substandard treatment effects when the flow rate is small.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment, and more specifically, relates to an integrated domestic water purification and treatment device. Background Art

[0002] Wastewater is generated in homes, schools, commercial places, public facilities and other places. The wastewater contains organic matter, pathogenic microorganisms, suspended solids or metal pollutants. In order to prevent eutrophication of water bodies and the spread of pathogens, domestic sewage needs to be purified. After treatment, domestic sewage can be reused for irrigation and industrial cooling water.

[0003] The Chinese patent publication number is: CN111875099B, a domestic water purification and treatment equipment. The domestic water purification and treatment equipment, after domestic wastewater is filtered through a filtration treatment tank, a purification sedimentation tank, a polypropylene melt-blown filter element, a granular activated carbon filter element, and a compressed activated carbon filter element, one path is connected to a water purification tap to purify ordinary water, and the other path is further purified and treated through a tubular hybrid membrane component, a natural mineral water generation tank, a post-activated carbon filter element, and a post-antibacterial membrane filter element before being connected to a mineral water tap to purify and prepare drinkable mineral water.

[0004] Existing domestic sewage purification devices have the following disadvantages:

[0005] 1. Existing domestic sewage purification devices, after front-end treatment, filter out large-diameter impurities in the water. The remaining microorganisms need to react with chemicals for treatment. Most of them rely on fixed dosing rates or manual dosing. The fixed dosing rate or manual experience adjustment cannot match the flow rate changes in real time. When the flow rate suddenly increases, the dosing of chemicals will be delayed. When the flow rate suddenly decreases, the quantitative dosing of chemicals will cause waste.

[0006] 2. Existing domestic sewage purification devices rely on water pumps and water inlet pipes to add sewage. When there are problems such as impurity accumulation in the sewage, there is no effective treatment solution, which may cause impurities to block the water inlet, resulting in low sewage treatment efficiency.

[0007] In view of this, the existing structure and defects are studied and improved, and an integrated domestic water purification and treatment equipment is provided to achieve a more practical purpose. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention provides an integrated domestic water purification and treatment equipment to solve the above problems.

[0009] The drainpipe is connected to the drainpipe of the invention and the drainpipe is connected to the drainpipe of the invention. The upper end of the pipe is fixedly installed with a water receiving pipe, the circumferential end of the inclined guide tube is fixedly installed with a sealed bearing, the circumferential end of the adjusting ball is provided with at least two ridges, the lower end of the adjusting ball is fixedly installed with a movable rod, and the movable rod is slidably installed on the inner side wall of the sealed bearing, the end of the upper section of the damper is fixedly installed on the lower end of the movable rod, and the circumferential end of the damper is also provided with a return spring, the side end of the damper is fixedly installed with a connecting rod, the side end of the connecting rod is fixedly installed with a third connecting rod, the side end of the third connecting rod is fixedly installed with a second connecting rod, the second connecting rod is slidably installed on the inner side wall of the side guide rod, the upper end of the second connecting rod is fixedly installed with a first connecting rod, and the double-sided rack is fixedly installed on the upper end of the first connecting rod. The medicine storage box is frustum-shaped, and a connecting guide tube is fixedly installed between the medicine storage box and the tank cover.

[0010] Preferably, there are two valve plates, both of which are located on the inner side wall of the connecting conduit, and transmission shafts are fixedly installed through the side ends of both valve plates.

[0011] Preferably, the two transmission shafts are respectively rotatably installed on the side ends of the connecting conduit, the side ends of the two transmission shafts are fixedly installed with fixed columns, the circumferential ends of the two fixed columns are fixedly installed with gears, and the two gears are meshed with double-sided racks.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In the present invention, a regulating ball is provided in the water receiving pipe. When the flow rate of sewage through the throat pipe changes, the effective flow cross-sectional area of ​​the water receiving pipe is changed by the flow pressure difference. By dynamically adjusting the cross-sectional area, the impact of sudden flow changes on downstream equipment is reduced, the water hammer effect and the like are avoided, and the risk of vibration of the inclined conduit or leakage at the inclined conduit interface due to excessive pressure difference is reduced.

[0014] In the present invention, thorns are provided on the regulating ball to preliminarily disperse some microorganisms in the sewage, thereby avoiding the accumulation of impurities in the sewage during addition, which may lead to blockage of the sewage addition. At the same time, it can assist in mixing the subsequent sewage and the reagent more evenly. Combined with the dynamic regulation of the regulating ball, it can more effectively avoid blockage during sewage addition.

[0015] In the present invention, by cooperating with a double-sided rack, a first connecting rod, a second connecting rod and a third connecting rod, when the adjusting ball moves downward, the double-sided rack will be driven to move downward, so that the valve plate rotates and opens, so that the flow rate of the added medicine and the flow rate of the sewage are matched, and the reaction requirements of the sewage treatment are guaranteed. At the same time, small amounts of multiple additions of medicines are achieved without manual participation in adjustment. The amount of medicine added can be adjusted in real time according to the flow rate of domestic sewage, so as to avoid insufficient treatment speed when the sewage flow rate is large and waste of medicine or substandard treatment effect when the flow rate is small.

[0016] In the present invention, by cooperating with a vertical rod and a limit plate, when the connecting rod moves downward, it will contact the limit plate, and the limit plate will limit the position of the damper to prevent the position of the burr from dropping beyond the limit under extreme flow rate and causing damage to the structure. At the same time, it prevents the valve plate from rotating excessively in the connecting conduit and causing impact on the inner wall of the connecting conduit, thereby ensuring the adaptability of the device to different flow rates when in use and having a certain protective effect on the equipment.

[0017] In the present invention, by cooperating with a damper and a connecting rod, oscillations during sudden flow changes can be suppressed, so that the flow of water in the throat and the flow of medicine in the medicine storage box are more stable when passing through the connecting conduit, avoiding the occurrence of unstable water flow and unstable pressure difference caused by excessive oscillation of the regulating ball in the throat, leading to pipe rupture, etc., so that the device is adaptable to scenarios with drastic flow fluctuations and smooth flow, and has higher adaptability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the processing tank of the present invention;

[0019] Figure 2 It is a schematic diagram of the explosion structure of the throat pipe of the present invention;

[0020] Figure 3 1 is a schematic diagram of the cross-sectional structure of the throat pipe of the present invention;

[0021] Figure 4 It is a schematic diagram of the explosion structure of the damper of the present invention;

[0022] Figure 5 It is a schematic diagram of the exploded structure of the first connecting rod of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the medicine storage box of the present invention;

[0024] Figure 7 It is a schematic structural diagram of the double-sided rack of the present invention;

[0025] Figure 8 It is a structural schematic diagram of the valve plate of the present invention.

[0026] In the figure, the correspondence between the component names and the drawing numbers is: 1. Treatment tank; 11. Side guide rod; 12. Mounting plate; 13. Vertical pole; 14. Limit plate; 15. Tank cover; 2. Throat; 21. Water connecting pipe; 22. Inclined conduit; 23. Sealed bearing; 3. Adjusting ball; 31. Burr; 32. Movable rod; 4. Damper; 41. Connecting rod; 42. Return spring; 5. Double-sided rack; 51. First connecting rod; 52. Second connecting rod; 53. Third connecting rod; 6. Medicine storage box; 61. Connecting conduit; 7. Valve plate; 71. Drive shaft; 72. Fixed column; 73. Gear. DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0028] See also Figure 1 - Figure 8 The present invention provides an integrated domestic water purification treatment device, including a treatment tank 1, a collection mechanism for dumping sewage is provided on the treatment tank 1, and a feeding mechanism for adding treatment agents is provided on the treatment tank 1. Wastewater is generated in homes, schools, commercial places, public facilities and other places. The wastewater contains organic matter, pathogenic microorganisms, suspended matter or metal pollutants and other components. In order to prevent eutrophication of water bodies and the spread of pathogens, the domestic sewage can be reused for irrigation and industrial cooling water after treatment. When treating domestic sewage, the large-diameter impurities of the sewage that has been treated at the front end have been filtered out, and the microorganisms in the remaining water need to react with the agent. The domestic sewage can be put into the treatment tank 1 through the water receiving pipe 21 and the throat pipe 2. After the sewage is added, sodium hypochlorite disinfectant needs to be added to disinfect the domestic sewage to ensure that the pathogenic microorganisms in the domestic sewage meet the discharge standards after treatment;

[0029] The collecting mechanism includes a throat pipe 2, an adjusting ball 3 and a damper 4. The feeding mechanism includes a double-sided rack 5, a medicine storage box 6 and a valve plate 7. An inclined conduit 22 is fixedly installed between the throat pipe 2 and the treatment tank 1. The adjusting ball 3 is located on the inner side wall of the throat pipe 2. A mounting plate 12 is fixedly installed on the side end of the treatment tank 1. The damper 4 is fixedly installed on the upper end of the mounting plate 12. When adding domestic sewage, the water inlet pipe can be installed on the water receiving pipe 21. The double-sided rack 5 is located on the side end of the medicine storage box 6. A tank cover 15 is fixedly installed on the upper end of the treatment tank 1. The medicine storage box 6 is located on the upper end of the treatment tank 1. The circumferential end of the treatment tank 1 is fixedly mounted. A side guide rod 11 is fixedly installed, a vertical rod 13 is fixedly installed on the upper end of the mounting plate 12, and a limit plate 14 is fixedly installed on the upper end of the vertical rod 13. The vertical rod 13 and the limit plate 14 are set on the mounting plate 12. When the damper 4 drives the connecting rod 41 to move downward and contacts the limit plate 14, it will be braked by the limit plate 14, thereby preventing the connecting rod 41 from moving downward beyond the extreme position. A damper 4 is provided on the inner side wall of the return spring 42. The damper 4 and the connecting rod 41 cooperate to suppress oscillation when the flow rate suddenly changes, so that when the regulating ball 3 cooperates with the double-sided rack 5 to move, it avoids excessive oscillation, resulting in unstable water flow.

[0030] The upper end of the throat pipe 2 is fixedly installed with a water receiving pipe 21, the circumferential end of the inclined conduit 22 is fixedly installed with a sealed bearing 23, the circumferential end of the adjusting ball 3 is provided with at least two ridges 31, and the lower end of the adjusting ball 3 is fixedly installed with a movable rod 32, which is slidably installed on the inner side wall of the sealed bearing 23. The end of the upper section of the damper 4 is fixedly installed at the lower end of the movable rod 32, and the circumferential end of the damper 4 is also provided with a return spring 42. The side end of the damper 4 is fixedly installed with a connecting rod 41. Domestic sewage will enter the treatment tank 1 through the water receiving pipe 21, the throat pipe 2 and the inclined conduit 22. An adjusting ball 3 is provided in the throat pipe 2. When there is a lot of sewage, the flow rate of sewage passing through the throat pipe 2 When the flow rate of sewage is too low, the flow rate of sewage passing through the throat pipe 2 will be smaller, that is, the impact force generated when the sewage passes through the throat pipe 2 will be different. When the impact force is larger, the regulating ball 3 will be forced to move downward more, and the flow cross-sectional area at the throat pipe 2 will be larger. When the impact force is smaller, the regulating ball 3 will be forced to move downward less, and the flow cross-sectional area at the throat pipe 2 will be smaller. A convex thorn 31 is provided on the circumferential end of the regulating ball 3. While dynamically adjusting the opening of the throat pipe 2 according to the sewage flow rate, the convex thorn 31 on the regulating ball 3 significantly disturbs the sewage flow, thereby breaking up the sewage impurities and cooperating with the dynamic movement of the regulating ball 3 to avoid blockage during sewage feeding.

[0031] The side end portion of the connecting rod 41 is fixedly mounted with a third connecting rod 53, and the side end portion of the third connecting rod 53 is fixedly mounted with a second connecting rod 52. The second connecting rod 52 is slidably mounted on the inner side wall of the side guide rod 11, and the upper end portion of the second connecting rod 52 is fixedly mounted with the first connecting rod 51. The double-sided rack 5 is fixedly mounted on the upper end portion of the first connecting rod 51. When the adjusting ball 3 moves downward, the adjusting ball 3 compresses the damper 4 and the return spring 42. When the damper 4 and the return spring 42 are compressed, they drive the connecting rod 41 to move downward. The downward movement of the connecting rod 41 drives the third connecting rod 53 to move downward. The downward movement of the third connecting rod 53 drives the second connecting rod 52 to move downward. The downward movement of the second connecting rod 52 drives the double-sided rack 5 on the first connecting rod 51 to move downward. The downward movement of the double-sided rack 5 drives the two gears 73 to rotate in opposite directions.

[0032] The medicine storage box 6 is truncated cone-shaped. A connecting conduit 61 is fixedly installed between the medicine storage box 6 and the tank cover 15. There are two valve plates 7. The two valve plates 7 are located on the inner side wall of the connecting conduit 61. The side ends of the two valve plates 7 are fixedly installed with transmission shafts 71. The two transmission shafts 71 are respectively rotatably installed on the side ends of the connecting conduit 61. The side ends of the two transmission shafts 71 are fixedly installed with fixed columns 72. The circumferential ends of the two fixed columns 72 are fixedly installed with gears 73. The two gears 73 are meshed with the double-sided rack 5. The rotation of the two gears 73 will drive the two fixed columns 72. When the two valve plates 7 rotate, the two fixed columns 72 will drive the two transmission shafts 71 to rotate, and the rotation of the two transmission shafts 71 will drive the two valve plates 7 to rotate gradually. The greater the angle of rotation of the two valve plates 7, the larger the opening at the connecting conduit 61, that is, the more medicine enters the treatment tank 1, thereby achieving that when the flow at the throat pipe 2 is larger and the impact regulating ball 3 is moved downward more, more medicine in the medicine storage box 6 enters the treatment tank 1, and when the flow at the throat pipe 2 is smaller and the impact regulating ball 3 is moved downward less, the less medicine in the medicine storage box 6 enters the treatment tank 1, thereby achieving dynamic adjustment of the flow of the medicine according to the flow of domestic sewage.

[0033] Working principle:

[0034] In the first step, wastewater is generated in homes, schools, commercial places, public facilities and other places. The wastewater contains organic matter, pathogenic microorganisms, suspended solids or metal pollutants. In order to prevent eutrophication of water bodies and the spread of pathogens, domestic sewage can be reused for irrigation and industrial cooling water after treatment. When treating domestic sewage, the large-diameter impurities in the sewage that has been treated at the front end have been filtered out, and the microorganisms in the remaining water need to react with the reagent. When treating domestic sewage, the domestic sewage can be put into the treatment tank 1 through the water pipe 21 and the throat pipe 2. After the sewage is added, sodium hypochlorite disinfectant needs to be added to disinfect the domestic sewage to ensure that the pathogenic microorganisms in the domestic sewage meet the discharge standards after treatment;

[0035] In the second step, when adding domestic sewage, the water inlet pipe can be installed on the water receiving pipe 21, and the domestic sewage will enter the treatment tank 1 through the water receiving pipe 21, the throat pipe 2 and the inclined conduit 22. A regulating ball 3 is provided in the throat pipe 2. When there is more sewage, the flow rate of sewage through the throat pipe 2 will be larger, and when there is less sewage, the flow rate of sewage through the throat pipe 2 will be smaller, that is, the impact force generated when the sewage passes through the throat pipe 2 will be different. When the impact force is larger, the regulating ball 3 will be forced to move downward more, and the flow cross-sectional area at the throat pipe 2 will be larger. When the impact force is smaller, the regulating ball 3 will be forced to move downward less, and the flow cross-sectional area at the throat pipe 2 will be smaller. A convex thorn 31 is provided on the circumferential end of the regulating ball 3. While dynamically adjusting the opening of the throat pipe 2 according to the sewage flow rate, the convex thorn 31 on the regulating ball 3 significantly disturbs the sewage flow, thereby achieving the dispersion of sewage impurities, and cooperating with the dynamic movement of the regulating ball 3 to avoid blockage during sewage feeding;

[0036] This device provides a regulating ball 3 in the water receiving pipe 21. When the flow rate of sewage through the throat pipe 2 changes, the effective flow cross-sectional area of ​​the water receiving pipe 21 is changed by the flow pressure difference. By dynamically adjusting the cross-sectional area, the impact of sudden flow changes on downstream equipment is reduced, the water hammer effect is avoided, and the risk of vibration of the inclined conduit 22 or leakage at the interface of the inclined conduit 22 caused by excessive pressure difference is reduced.

[0037] This device provides thorns 31 on the regulating ball 3 to initially disperse some microorganisms in the sewage, thereby preventing the accumulation of impurities in the sewage during feeding, which may lead to blockage of the sewage feeding. At the same time, it can help the subsequent sewage and reagents to be mixed more evenly. This, combined with the dynamic regulation of the regulating ball 3, can more effectively avoid blockage during sewage feeding.

[0038] In the third step, when the adjusting ball 3 moves downward, the adjusting ball 3 will compress the damper 4 and the return spring 42. When the damper 4 and the return spring 42 are compressed, they will drive the connecting rod 41 to move downward. The downward movement of the connecting rod 41 will drive the third connecting rod 53 to move downward. The downward movement of the third connecting rod 53 will drive the second connecting rod 52 to move downward. The downward movement of the second connecting rod 52 will drive the double-sided rack 5 on the first connecting rod 51 to move downward. The downward movement of the double-sided rack 5 will drive the two gears 73 to rotate in opposite directions. The rotation of the two gears 73 will drive the two fixed columns 72 to rotate. The two fixed columns 72 will drive the two transmission shafts 71 to rotate, and the rotation of the two transmission shafts 71 will drive the two valve plates 7 to rotate gradually. The greater the angle of rotation of the two valve plates 7, the larger the opening at the connecting conduit 61, that is, the more medicine enters the treatment tank 1, thereby achieving that when the flow at the throat pipe 2 is large and the impact adjustment ball 3 moves downward more, more medicine in the medicine storage box 6 enters the treatment tank 1, and when the flow at the throat pipe 2 is small and the impact adjustment ball 3 moves downward less, the less medicine in the medicine storage box 6 enters the treatment tank 1, thereby achieving dynamic adjustment of the flow of medicine according to the flow of domestic sewage;

[0039] The device is provided with a double-sided rack 5, a first connecting rod 51, a second connecting rod 52 and a third connecting rod 53, and when the regulating ball 3 moves downward, the double-sided rack 5 is driven to move downward, so that the valve plate 7 is rotated and opened, so that the flow rate of the dosing agent matches the flow rate of the sewage, ensuring the reaction requirements of the sewage treatment, and at the same time realizing the addition of small amounts of agents multiple times without manual participation in adjustment. The dosage of the agent can be adjusted in real time according to the flow rate of domestic sewage, avoiding insufficient treatment speed when the sewage flow rate is large and waste of agents or substandard treatment effect when the flow rate is small;

[0040] Fourth, a vertical rod 13 and a limit plate 14 are set on the mounting plate 12. When the damper 4 drives the connecting rod 41 to move downward and contact the limit plate 14, it will be braked by the limit plate 14, thereby preventing the connecting rod 41 from moving downward beyond the extreme position. A damper 4 is set on the inner wall of the return spring 42. The damper 4 and the connecting rod 41 cooperate to suppress oscillations when the flow rate suddenly changes, so that when the regulating ball 3 moves with the double-sided rack 5, excessive oscillations are avoided, which causes unstable water flow.

[0041] The device is provided with a vertical rod 13 and a limit plate 14 that cooperate with each other. When the connecting rod 41 moves downward, it will contact the limit plate 14. The limit plate 14 will limit the position of the damper 4, preventing the position of the thorn 31 from falling beyond the limit under extreme flow rates and causing damage to the structure. At the same time, it prevents the valve plate 7 from excessively rotating in the connecting conduit 61 and causing impact on the inner wall of the connecting conduit 61. This ensures the adaptability of the device to different flow rates when in use and has a certain protective effect on the equipment.

[0042] This device is equipped with a damper 4 and a connecting rod 41 to suppress oscillations when the flow rate suddenly changes, so that the flow of water in the throat pipe 2 and the medicine in the medicine storage box 6 are more stable when passing through the connecting conduit 61, avoiding the occurrence of unstable water flow and unstable pressure difference caused by excessive oscillation of the regulating ball 3 in the throat pipe 2, resulting in pipe rupture, etc., so that this device is adaptable to scenarios with drastic flow fluctuations and smooth flow, and has higher adaptability and stability.

[0043] The examples of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as are suited for specific applications.

Claims

1. An integrated domestic water purification treatment device, comprising a treatment tank (1), characterized in that: The treatment tank (1) is provided with a collection mechanism for dumping sewage, and the treatment tank (1) is provided with a feeding mechanism for adding treatment agents; The collecting mechanism comprises a throat pipe (2), an adjusting ball (3) and a damper (4); the feeding mechanism comprises a double-sided rack (5), a medicine storage box (6) and a valve plate (7); an inclined conduit (22) is fixedly installed between the throat pipe (2) and the processing tank (1); the adjusting ball (3) is located on the inner side wall of the throat pipe (2); a mounting plate (12) is fixedly installed on the side end of the processing tank (1); the damper (4) is fixedly installed on the upper end of the mounting plate (12); the double-sided rack (5) is located on the side end of the medicine storage box (6); a tank cover (15) is fixedly installed on the upper end of the processing tank (1); and the medicine storage box (6) is located on the upper end of the processing tank (1); The processing tank (1) is fixedly mounted with a side guide rod (11) at the circumferential end thereof, the upper end of the mounting plate (12) is fixedly mounted with a vertical rod (13), the upper end of the vertical rod (13) is fixedly mounted with a limit plate (14), the upper end of the throat pipe (2) is fixedly mounted with a water receiving pipe (21), the circumferential end of the inclined conduit (22) is fixedly mounted with a sealing bearing (23), the circumferential end of the regulating ball (3) is provided with at least two convex thorns (31), and the lower end of the regulating ball (3) is fixedly mounted with a A movable rod (32) is provided, the movable rod (32) being slidably mounted on the inner side wall of the sealed bearing (23), the end of the upper section of the damper (4) being fixedly mounted on the lower end of the movable rod (32), the circumferential end of the damper (4) being further provided with a return spring (42), the side end of the damper (4) being fixedly mounted with a connecting rod (41), the side end of the connecting rod (41) being fixedly mounted with a third connecting rod (53), and the side end of the third connecting rod (53) being fixedly mounted with a second connecting rod (52); The second connecting rod (52) is slidably mounted on the inner side wall of the side guide rod (11), the upper end of the second connecting rod (52) is fixedly mounted with the first connecting rod (51), the double-sided rack (5) is fixedly mounted on the upper end of the first connecting rod (51), the medicine storage box (6) is truncated, a connecting conduit (61) is fixedly mounted between the medicine storage box (6) and the tank cover (15), the number of the valve plates (7) is two, both of the two valve plates (7) are located on the inner side wall of the connecting conduit (61), the side ends of the two valve plates (7) are fixedly mounted with a transmission shaft (71), the two transmission shafts (71) are respectively rotatably mounted on the side ends of the connecting conduit (61), the side ends of the two transmission shafts (71) are fixedly mounted with a fixing column (72), the circumferential ends of the two fixing columns (72) are fixedly mounted with a gear (73), and the two gears (73) are meshed with the double-sided rack (5).

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