Floating type water quality detection device
By using a floating water quality testing device that utilizes wave power to drive a bevel gear transmission system, automatic collection and classified storage of water samples are achieved. This solves the problems of reliance on external power and insufficient portability of traditional devices, and improves collection efficiency and sample integrity.
Patent Information
- Application Number
- CN202610042401.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-14
- Publication Date
- 2026-02-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional water quality testing devices rely on external power or manual operation, making it difficult to achieve automated collection and classification storage of water samples from multiple depths. Furthermore, their portability and storage capacity are insufficient, resulting in high costs and low efficiency.
A floating water quality testing device was designed, which uses wave power to drive a bevel gear transmission system to achieve automatic collection and classified storage of water samples. Combined with a one-way valve mechanism and ratchet pawl transmission, it ensures water sample sealing and multi-depth sampling, and has portability and storage performance.
It enables automated water sample collection without external power or manual operation, improving collection efficiency and sample integrity, reducing costs, facilitating handling and storage, and is suitable for different aquatic environments.
Smart Images

Figure CN121499162A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of water quality detection, and particularly relates to a floating type water quality detection device. BACKGROUND
[0002] In the field of water quality detection, the traditional water sample collection and detection related devices have many significant defects, which are as follows:
[0003] Power dependence limitation: The traditional water quality sampling device mostly depends on external power supply or manual continuous driving, which not only increases energy consumption and labor cost, but also is limited by the use scene (such as remote water area, no power supply environment is difficult to operate).
[0004] Multiple depth sampling capability missing: The traditional device is difficult to realize the automatic classification collection of water samples at different depths, and often needs manual repeated adjustment of equipment depth, which is tedious and inefficient, and the collected samples are single, and cannot meet the demand of comprehensive analysis of water quality.
[0005] Insufficient portability and storage: The traditional sampling device has dispersed structure, large volume and weak folding storage capacity, and is inconvenient to carry and store, especially in field water operation, which has high transportation cost and inconvenient operation.
[0006] Insufficient automation and collaboration: The sampling, depth adjustment and sample sub-packaging of the traditional device need to be operated manually in steps, the collaboration of each component is poor, the overall efficiency is low, and it cannot meet the efficient sampling demand.
[0007] In summary, there is a lack of a floating type water quality detection device which can automatically adjust the diving depth, switch the sampling container and other functions to realize the automatic classification storage of water samples at different depths, and make up for the defects of the traditional device in multidimensional sampling, portability and other functions. SUMMARY
[0008] In view of the deficiencies of the prior art, the present application provides a floating type water quality detection device, which solves the problems in the background art.
[0009] Technical Solution: To solve the above-mentioned technical problems, according to one aspect of the present invention, more specifically, a float-type water quality testing device includes a bottom box, a sampling box fixed inside the bottom box, a through-type slide rail on the lower surface of the bottom box, wave plates rotatably connected to the upper left and right sides of the sampling box, a bevel gear one coaxially fixed inside the wave plate, a bevel gear two meshing at the bottom of the bevel gear one, a screw one fixed to the lower surface of the bevel gear two on the left side, a sampling cylinder fixed to the left side inside the sampling box, a piston slidably connected inside the sampling cylinder, a rectangular cylinder fixed to the upper surface of the piston, the top of the rectangular cylinder extending through to the top of the sampling cylinder, the outer surface of the screw one threadedly connected to the inside of the rectangular cylinder, a valve cylinder communicating with the center of the lower surface and the right side of the outer surface of the sampling cylinder, a valve core slidably connected inside the valve cylinder, a spring fixed inside the valve core and inside the valve cylinder, and a through-hole one opening on the outer surface of the valve core.
[0010] Furthermore, the valve cylinder, valve core, spring, and through hole one together form a one-way valve mechanism. A second screw is rotatably connected inside the slide rail, and a screw block is threaded onto the outer surface of the second screw. A push-pull rod is rotatably connected to the inner side of the screw block. A rotating frame is rotatably connected to the left side inside the slide rail. The rotating frame has through-type movable slots on both its front and rear surfaces. A movable rod is movably connected inside the movable slots, and the movable rod is fixedly connected to the bottom end of the push-pull rod. A suction tube is fixed to the outside of the rotating frame, and the top end of the suction tube communicates with the bottom of the valve cylinder located below. The sampling box has a lower surface... A ring frame is fixed to the surface, and a turntable is rotatably connected inside the ring frame. The right end of the valve cylinder located on the right side is connected to a fixed tube. An arc-shaped groove is opened on the left side of the inner wall of the ring frame, and the fixed tube passes through the arc-shaped groove. Multiple bottle slots are opened on the upper surface of the turntable. A bent tube is embedded in the lower part of the bottle slot. The bottom end of the bent tube passes through to the outer surface of the turntable. A sampling bottle is placed inside the bottle slot. The top end of the bent tube is located inside the sampling bottle. A through hole is opened on the outer surface of the top end of the bent tube. A magnetic ring is fixed on the lower inner surface of the sampling bottle. A magnetic piece is magnetically attracted to the top of the bent tube.
[0011] Furthermore, a rotating rod is fixed to the lower surface of the second bevel gear on the right side. The bottom end of the rotating rod extends into the interior of the sampling box and is fixed with a ratchet. A bevel gear is fixed to the right side of the outer surface of the second screw. A bevel gear is meshed with a fourth bevel gear at the top of the third bevel gear. A rotating rod is fixed to the upper surface of the fourth bevel gear. The top end of the rotating rod extends into the interior of the sampling box. A spur gear is fixed to the outer surface of the rotating rod. Two shafts are fixed to the top of the rotating rod. Pads are rotatably connected to the outer surface of the shafts. A torsion spring is provided at the top of the pawl. The pawl engages with the ratchet.
[0012] Furthermore, a second spur gear is meshed with the left side of the first spur gear, and the second spur gear is rotatably connected to the inside of the sampling box. Several tooth grooves are opened on the outer surface of the turntable, and the turntable is meshed with the second spur gear through the tooth grooves.
[0013] Furthermore, the bottom box has sliding grooves on both the left and right sides of its upper surface, and guide rods are fixed inside the sliding grooves. Two sliders are slidably connected to the outer surface of the guide rods. The four sliders are divided into two groups, and a box cover is fixed to the top of the two sliders in each group. A handle is fixed to the right side of the bottom box.
[0014] Furthermore, both of the aforementioned box lids are hollow structures.
[0015] Furthermore, the sampling bottle has a cap threadedly connected to the top opening.
[0016] Furthermore, the right end of the second screw extends through to the right side of the base box and is fixed with an operating wheel.
[0017] The beneficial effects of the float-type water quality testing device of the present invention are as follows:
[0018] (1) This invention utilizes natural water waves as a power source, eliminating the need for additional electricity or manual operation, thus achieving automated water sample collection. This not only reduces labor costs but also avoids the risk of water sample contamination caused by manual operation. The left-side wave plate drives the screw to rotate via bevel gear transmission, which in turn moves the piston up and down. This, combined with a one-way valve mechanism, enables the intake and discharge of water samples. The entire sampling process is highly sealed, reducing the contact between the water sample and air, ensuring the original state of the water sample, and improving the accuracy of subsequent test results.
[0019] (2) This invention enables the automatic collection and classified storage of water samples at different depths. The wave plate on the right side, through a transmission structure such as ratchet, bevel gear, and spur gear, drives the rotating frame to rotate and adjust the diving depth of the suction tube. On the other hand, it drives the turntable to rotate, so that different sampling bottles are connected to the fixed tube in sequence, thereby automatically collecting water samples from different depth ranges. Multiple sampling bottles are stored independently, avoiding cross-contamination of samples. At the same time, multiple samples can be collected at multiple depths without manual intervention, which greatly improves the sampling efficiency and provides rich sample support for comprehensive water quality analysis.
[0020] (3) This invention has excellent portability and storage performance. The lid can be folded and unfolded by sliding along the guide rod via a slider. After folding, the device forms a complete box structure. Combined with the foldable storage rack, the size of the device is minimized, making it easy to transport and store. The hollow lid not only reduces the overall weight of the device but also ensures buoyancy, allowing the device to float stably on the water surface for sampling. The bottom of the sampling bottle is automatically sealed after sampling by the magnetic attraction of the magnetic plate and the magnetic ring, effectively preventing water sample leakage and further ensuring the integrity of the sample.
[0021] (4) The present invention has a compact structure and clear transmission logic. The components are highly coordinated. The clever setting of the one-way valve mechanism ensures the uniqueness of the water sample flow direction and avoids backflow pollution. The combination of the turntable and the bend realizes the automatic dispensing of samples. The setting of the operating wheel makes it easy to manually adjust the device status. It takes into account the flexibility of automated operation and manual intervention. It is suitable for different water environments and sampling needs and has strong practicality. Attached Figure Description
[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.
[0023] Figure 1 This is a schematic diagram of the structure of the present invention;
[0024] Figure 2 This is a front cross-sectional view of the present invention;
[0025] Figure 3 This is a schematic diagram of the internal structure of the present invention;
[0026] Figure 4 For the present invention Figure 3 A magnified structural diagram of point A in the middle;
[0027] Figure 5 For the present invention Figure 2 A magnified structural diagram of point B in the middle;
[0028] Figure 6 For the present invention Figure 3 A magnified structural diagram of point C in the middle;
[0029] Figure 7 This is a schematic diagram of the ring frame structure in this invention;
[0030] Figure 8 This is a schematic diagram of the turntable structure in this invention;
[0031] Figure 9 This is a schematic diagram of the structure of the box cover in this invention;
[0032] Figure 10 This is a schematic cross-sectional view of the structure on the right side of the present invention.
[0033] In the diagram: 1. Base box; 2. Sampling box; 3. Slide rail; 4. Corrugated plate; 5. Bevel gear one; 6. Bevel gear two; 7. Screw one; 8. Sampling cylinder; 9. Piston; 10. Rectangular cylinder; 11. Valve cylinder; 12. Valve core; 13. Spring; 14. Through hole one; 15. Screw two; 16. Screw block; 17. Push-pull rod; 18. Rotating frame; 19. Movable groove; 20. Movable rod; 21. Suction tube; 22. Ring frame; 23. Turntable; 24. Fixed... 25. Fixed tube; 26. Arc groove; 27. Bottle groove; 28. Bend; 29. Through hole two; 30. Sampling bottle; 31. Magnetic ring; 32. Magnetic plate; 33. Rotating rod one; 34. Ratchet; 35. Bevel gear three; 36. Bevel gear four; 37. Rotating rod two; 38. Spur gear one; 39. Shaft; 40. Pawl; 41. Torsion spring; 42. Spur gear two; 43. Slide groove; 44. Guide rod; 45. Slider; 46. Box cover; 47. Handle. Detailed Implementation
[0034] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.
[0035] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0036] Reference Figures 1-10 A floating water quality testing device includes a base box 1, a sampling box 2 fixed inside the base box 1, a through-type slide 3 on the lower surface of the base box 1, a wave plate 4 rotatably connected to the upper left and right sides of the sampling box 2, a bevel gear 5 coaxially fixed inside the wave plate 4, a bevel gear 6 meshing at the bottom of the bevel gear 5, a screw 7 fixed to the lower surface of the bevel gear 6 on the left side, a sampling cylinder 8 fixed to the left side inside the sampling box 2, a piston 9 slidably connected inside the sampling cylinder 8, a rectangular cylinder 10 fixed to the upper surface of the piston 9, the top of the rectangular cylinder 10 extending through to the top of the sampling cylinder 8, the outer surface of the screw 7 threadedly connected to the inside of the rectangular cylinder 10, a valve cylinder 11 connected to the center of the lower surface of the sampling cylinder 8 and the right side of the outer surface, a valve core 12 slidably connected inside the valve cylinder 11, a spring 13 fixed inside the valve core 12 and the valve cylinder 11, and a through-hole 14 on the outer surface of the valve core 12.
[0037] The valve cylinder 11, valve core 12, spring 13, and through hole 14 together form a one-way valve mechanism. A second screw 15 is rotatably connected inside the slide rail 3. A screw block 16 is threaded onto the outer surface of the second screw 15. A push-pull rod 17 is rotatably connected to the inner side of the screw block 16. A rotating frame 18 is rotatably connected to the left side inside the slide rail 3. Both the front and rear surfaces of the rotating frame 18 have through-type movable slots 19. A movable rod 20 is movably connected inside the movable slots 19. The movable rod 20 is fixedly connected to the bottom end of the push-pull rod 17. A suction tube 21 is fixed to the outside of the rotating frame 18. The top end of the suction tube 21 communicates with the bottom of the valve cylinder 11 located below. A ring frame 22 is fixed to the lower surface inside the sampling box 2. The ring frame 22 is rotatably connected to a turntable 23. The valve cylinder 11 located on the right side is connected to a fixed tube 24 at its right end. An arc-shaped groove 25 is opened on the left side of the inner wall of the ring frame 22. The fixed tube 24 passes through the arc-shaped groove 25. Multiple bottle slots 26 are opened on the upper surface of the turntable 23. A bent tube 27 is embedded in the lower part of the bottle slot 26. The bottom end of the bent tube 27 passes through to the outer surface of the turntable 23. A sampling bottle 29 is placed inside the bottle slot 26. The top end of the bent tube 27 is located inside the sampling bottle 29. A through hole 28 is opened on the outer surface of the top end of the bent tube 27. A magnetic ring 30 is fixed on the lower surface of the sampling bottle 29. A magnetic piece 31 is magnetically attracted to the top of the bent tube 27.
[0038] A rotating rod 32 is fixed to the lower surface of the bevel gear 2 6 on the right side. The bottom end of the rotating rod 32 extends into the sampling box 2 and is fixed with a ratchet 33. A bevel gear 34 is fixed to the right side of the outer surface of the screw 2 15. A bevel gear 4 35 is meshed with the top of the bevel gear 34. A rotating rod 2 36 is fixed to the upper surface of the bevel gear 4 35. The top end of the rotating rod 2 36 extends into the sampling box 2. A spur gear 37 is fixed to the outer surface of the rotating rod 2 36. Two shafts 38 are fixed to the top of the rotating rod 2 36. A pawl 39 is rotatably connected to the outer surface of the shafts 38. A torsion spring 40 is provided on the top of the pawl 39. The pawl 39 is engaged with the ratchet 33.
[0039] Preferably, a second spur gear 41 is meshed with the left side of the first spur gear 37. The second spur gear 41 is rotatably connected to the inside of the sampling box 2. Several tooth grooves are opened on the outer surface of the turntable 23, and the turntable 23 is meshed with the second spur gear 41 through the tooth grooves.
[0040] Preferably, the upper surface of the bottom box 1 is provided with sliding grooves 42 on both the left and right sides. A guide rod 43 is fixed inside the sliding groove 42. Two sliders 44 are slidably connected to the outer surface of the guide rod 43. The four sliders 44 are divided into two groups in the front and back. The top of the two sliders 44 in each group is fixed with a box cover 45. A handle 46 is fixed on the right side of the bottom box 1, which facilitates the movement of the device.
[0041] Preferably, both lids 45 are hollow structures, which reduces weight and density, making them easier to move and improving buoyancy.
[0042] Preferably, the top opening of the sampling bottle 29 is threaded with a cap to prevent leakage and contamination of the water sample inside the sampling bottle 29.
[0043] Preferably, the right end of the second screw 15 extends through to the right side of the bottom box 1 and is fixed with an operating wheel, making it convenient for personnel to operate the second screw 15 for storage and folding operations.
[0044] Working principle:
[0045] Folding facilitates handling: The two box covers 45 slide and merge along the slide groove 42 via the slider 44, so that the device forms a complete box structure. The screw 15 is rotated by the operator by turning the operating wheel, so that the screw block 16 moves to the right. The rotating frame 18 is pulled counterclockwise by the push-pull rod 17 to fold and store the device, minimizing the size of the device. The internal structure such as the sampling bottle 29 can be stored and protected. The device can be moved and stored by the operator by pulling the handle 46, and the water sample collected in the sampling bottle 29 can be tested for water quality later.
[0046] Float collection: such as Figures 1-10 As shown, the two box covers 45 are stretched out and the device is placed on the water surface. The device floats on the water surface and the wave plate 4 swings repeatedly due to the natural undulation of the water surface. The wave plate 4 on the left side rotates the screw 7 repeatedly through the bevel gear 5 and bevel gear 6, thereby causing the rectangular cylinder 10 to drive the piston 9 to move up and down, creating a negative pressure in the lower space of the sampling cylinder 8. This allows the underwater water sample to be drawn into the sampling cylinder 8 through the suction tube 21. When the piston 9 is pressed down, high pressure is generated to push the water sample through the valve cylinder 11, fixed tube 24, arc groove 25, bend 27, and through hole 28 on the right side, into the sampling bottle 29 on the left side.
[0047] Self-adjusting depth water sample: The wave plate 4 on the right side causes the rotating rod 32 to rotate repeatedly through bevel gear 5 and bevel gear 6, which in turn drives the ratchet 33 to rotate. The unidirectional self-locking characteristic of the ratchet 33 and the pawl 39 ensures that the rotating rod 36 connected to the pawl 39 will only rotate in one direction, thereby simultaneously driving the spur gear 37 and bevel gear 35 to rotate. Under the sequential transmission of bevel gear 35 and bevel gear 34, the screw 15 drives the screw block 16 to slide to the left, and the rotating frame 18 is opened clockwise by the push-pull rod 17. During the rotation, the suction tube... Port 21 continuously descends to a lower depth, thereby extracting water samples from different depths. Simultaneously, driven by spur gear 37 and spur gear 41, turntable 23 rotates. During rotation, the bottom end of the leftmost bend 27 remains connected to the inside of the arc groove 25 for a period of time until the edge of the arc groove 25 is reached, at which point the connection is severed. At this point, another bend 27 will connect to the inside of the arc groove 25, thus preventing a single sampling bottle 29 from being filled to capacity. This also allows different sampling bottles to obtain water samples from different depth ranges during self-operation.
[0048] One-way valve mechanism: Two valve cylinders 11 and their internal valve cores 12, springs 13 and through holes 14 respectively form two one-way valve mechanisms. The one-way valve mechanism located below only allows water samples to enter the sampling cylinder 8 and cannot flow back to the suction tube 21. The one-way valve mechanism located on the right only allows water samples to flow out of the sampling cylinder 8 from left to right and cannot flow back.
[0049] Inside, the cylindrical valve core 12 blocks the water inlet direction. When there is negative pressure (the lower valve core 12 slides upward when the piston 9 moves up) or pressure (the right valve core 12 slides to the right when the piston 9 moves down), it will be forced to slide and compress the spring 13, so that the through hole 14 and the suction tube 21 are connected, thereby supplying water flow.
[0050] Sampling bottle 29: After sampling, when personnel take the sampling bottle 29, the top of the bent tube 27 inserted at the bottom of the sampling bottle 29 is pulled out. At this time, the magnetic plate 31 will magnetically adhere to the magnetic ring 30 to form a seal, thereby preventing the water sample inside the sampling bottle 29 from leaking out from the bottom opening.
[0051] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.
Claims
1. A float-type water quality testing device, comprising a bottom tank (1), characterized in that: A sampling box (2) is fixed inside the bottom box (1). A through-type slide (3) is provided on the lower surface of the bottom box (1). Wave plates (4) are rotatably connected to the upper left and right sides of the sampling box (2). A bevel gear (5) is coaxially fixed inside the wave plate (4). A bevel gear (6) is meshed at the bottom of the bevel gear (5). A screw (7) is fixed on the lower surface of the bevel gear (6) on the left side. A sampling cylinder (8) is fixed on the left side inside the sampling box (2). A piston (9) is slidably connected inside the sampling cylinder (8). A rectangular tube (10) is fixed on the upper surface of the piston (9). The top of the rectangular tube (10) extends through to the top of the sampling tube (8). The outer surface of the screw (7) is threadedly connected to the inside of the rectangular tube (10). A valve tube (11) is connected to the center of the lower surface of the sampling tube (8) and the right side of the outer surface. A valve core (12) is slidably connected inside the valve tube (11). A spring (13) is fixed inside the valve core (12) and inside the valve tube (11). A through hole (14) is opened on the outer surface of the valve core (12).
2. The float-type water quality testing device according to claim 1, characterized in that: The valve cylinder (11), the valve core (12), the spring (13), and the through hole (14) together form a one-way valve mechanism. A screw rod (15) is rotatably connected inside the slide rail (3). A screw block (16) is threadedly connected to the outer surface of the screw rod (15). A push-pull rod (17) is rotatably connected to the inner side of the screw block (16). A rotating frame (18) is rotatably connected to the left side inside the slide rail (3). A through-type movable groove (19) is opened on both the front and rear surfaces of the rotating frame (18). A movable rod (20) is movably connected inside the movable groove (19). The movable rod (20) is fixedly connected to the bottom end of the push-pull rod (17). A suction tube (21) is fixed to the outside of the rotating frame (18). The top end of the suction tube (21) is connected to the bottom of the valve cylinder (11) located below. A ring frame (22) is fixed to the lower surface inside the sampling box (2). The ring frame (22) is rotatably connected to a turntable (23). The valve cylinder (11) located on the right side is connected to a fixed tube (24) at its right end. An arc groove (25) is opened on the left side of the inner wall of the ring frame (22). The fixed tube (24) passes through the arc groove (25). Multiple bottle slots (26) are opened on the upper surface of the turntable (23). A bent tube (27) is embedded in the lower part of the bottle slot (26). The bottom end of the bent tube (27) passes through the outer surface of the turntable (23). A sampling bottle (29) is placed inside the bottle slot (26). The top end of the bent tube (27) is located inside the sampling bottle (29). A through hole (28) is opened on the outer surface of the top end of the bent tube (27). A magnetic ring (30) is fixed on the lower surface of the inside of the sampling bottle (29). A magnetic piece (31) is magnetically attracted to the top of the bent tube (27).
3. The float-type water quality testing device according to claim 2, characterized in that: A rotating rod (32) is fixed on the lower surface of the bevel gear 2 (6) located on the right side. The bottom end of the rotating rod (32) extends into the interior of the sampling box (2) and is fixed with a ratchet (33). A bevel gear 3 (34) is fixed on the right side of the outer surface of the screw 2 (15). A bevel gear 4 (35) is meshed with the top of the bevel gear 3 (34). A rotating rod 2 (36) is fixed on the upper surface of the bevel gear 4 (35). The top end of the rotating rod 2 (36) extends into the interior of the sampling box (2). A spur gear 1 (37) is fixed on the outer surface of the rotating rod 2 (36). Two shafts (38) are fixed on the top of the rotating rod 2 (36). A pawl (39) is rotatably connected to the outer surface of the shaft (38). A torsion spring (40) is provided on the top of the pawl (39). The pawl (39) is engaged with the ratchet (33).
4. The float-type water quality testing device according to claim 3, characterized in that: The left side of the first spur gear (37) is meshed with the second spur gear (41), the second spur gear (41) is rotatably connected to the inside of the sampling box (2), and the outer surface of the turntable (23) is provided with several tooth grooves, and the turntable (23) is meshed with the second spur gear (41) through the tooth grooves.
5. The float-type water quality testing device according to claim 1, characterized in that: The bottom box (1) has sliding grooves (42) on both the left and right sides of its upper surface. A guide rod (43) is fixed inside the sliding groove (42). Two sliders (44) are slidably connected to the outer surface of the guide rod (43). The four sliders (44) are divided into two groups in front and behind. A box cover (45) is fixed to the top of the two sliders (44) in each group. A handle (46) is fixed to the right side of the bottom box (1).
6. The float-type water quality testing device according to claim 5, characterized in that: Both of the box covers (45) are hollow structures.
7. The float-type water quality testing device according to claim 2, characterized in that: The sampling bottle (29) has a cap threadedly connected to the top opening.
8. A float-type water quality testing device according to claim 2, characterized in that: The right end of the screw (15) extends through to the right side of the base box (1) and is fixed with an operating wheel.