Gravity bead chain positioning guide mechanism and floating ball liquid level detector

Abstract

The application relates to a gravity bead chain positioning guide mechanism and a floating ball liquid level detector. The gravity bead chain positioning guide mechanism comprises a bead belt assembly and a winding and unwinding assembly. The winding and unwinding assembly comprises a coiling cylinder, a shell and a handle. In actual use, the gravity bead chain positioning guide mechanism is arranged to wind the bead belt assembly, so that the bead belt assembly can be prevented from being easily wound and knotted in the redundant winding process, the bead belt assembly can be smoothly dropped into or taken out of the measuring cylinder, the number of rotation circles of the coiling cylinder can be accurately controlled through the handle, the release length of the bead belt assembly is controlled, the stability of the coiling cylinder is improved through manual rotation of the handle, and the stability of the bead belt assembly in the dropping or taking out of the measuring cylinder is improved.

Description

Technical Field

[0001] This application relates to the field of instrument testing and calibration technology, and in particular to a gravity bead chain positioning and guiding mechanism and a float level detector. Background Technology

[0002] The core water pool 37 of nuclear power unit 220 uses a float level detector 20 for level measurement. For example... Figure 1 As shown, the float level detector 20 is fixed inside the measuring cylinder 30 by a flange 31. The measuring cylinder 30 has a flange 31 on its top and an exhaust pipe 32 on its side wall. Figure 1 and Figure 2 As shown, a magnetic float 21 containing a permanent magnet floats in the water near the resistive chain 33 inside the measuring cylinder 30. This float level detector 20 can also be called a resistive chain 33 level detector. The resistive chain 33 contains multiple resistors 34 connected in series, with a magnetic switch 35 (such as a reed switch) connecting the nodes between adjacent resistors 34. As the magnetic float 21 reaches different heights with the water level, the magnetic field of its internal permanent magnet will open the magnetic switch 35 at that level. After the magnetic switches 35 at different positions are turned on, different numbers of resistors 34 are connected to the circuit, thereby converting the water level signal into an electrical signal. The signal processing unit 36 ​​obtains the number of resistors 34 connected to the circuit through the resistance value, and finally determines the water level at that time.

[0003] The reactor core pool level is a crucial process quantity signal that requires real-time monitoring. To ensure the proper functioning of the float level detector, preventative functional verification is necessary after each major overhaul. This level instrument is installed at the edge of the pool, and the main challenges of the verification process are the high risk of falls and injuries to personnel working near the pool, as well as the risk of tools falling and forming foreign objects in the reactor core.

[0004] The existing gravity bead belt is stacked on top of the magnetic float. By changing the number of gravity beads stacked on the belt, the magnetic float can be positioned at different heights in the water tank. However, because the belt contains gravity beads and connecting wires, it is prone to tangling and knotting during redundant winding. This causes the gravity bead belt to be unable to fall into or detach smoothly in the measuring cylinder, affecting the measurement process and increasing maintenance workload. Summary of the Invention

[0005] Therefore, it is necessary to provide a gravity bead chain positioning and guiding mechanism and a float level detector to address the problem that existing gravity bead belts, which contain gravity beads and connecting wires, are prone to tangling and knotting during redundant winding, causing the gravity bead belt to be unable to fall into or out of the measuring cylinder smoothly, affecting the measurement process and increasing maintenance workload.

[0006] A gravity bead chain positioning and guiding mechanism, comprising: a bead belt assembly and a take-up and release assembly.

[0007] The retractable assembly includes: a winding cylinder, a housing, and a handle; the winding cylinder is disposed inside the housing, and the handle is disposed at one end of the housing along the axis of the winding cylinder and connected to the winding cylinder, for driving the winding cylinder to rotate around its axis; a through hole is provided on the side wall of the end of the housing opposite to the handle;

[0008] One end of the beaded ribbon assembly is connected to the winding cylinder, and the other end can enter the measuring cylinder through the exhaust pipe of the measuring cylinder, so that the part of the beaded ribbon assembly entering the measuring cylinder is located between the magnetic float and the upper flange; the outer wall of the winding cylinder is provided with a winding groove, the extension direction of the winding groove is at an angle to the axis of the winding cylinder, the inner wall of the winding groove is adapted to the beaded ribbon assembly, and one end of the winding groove is connected to the through hole; along the axis of the winding cylinder, the outer radial direction of the winding cylinder gradually tapers towards the handle, and the through hole is higher than the exhaust pipe.

[0009] In practical use, the aforementioned gravity bead chain positioning and guiding mechanism requires the magnetic float to descend to a certain height. Rotating the handle rotates the winding cylinder, releasing the bead assembly. The bead assembly extends or retracts into the housing through through hole a, winding down or back onto the winding cylinder. After extending into the exhaust pipe, the bead assembly falls onto the upper part of the magnetic float and is located below the flange, which is located at the top of the measuring cylinder. By changing the number of rotations of the winding cylinder, the length of the released bead assembly is changed, thereby altering the length of the bead assembly falling onto the upper part of the magnetic float. By altering the force of gravity acting on the magnetic float, it can be positioned at different heights within the water tank. If the weight of the bead assembly is greater than or equal to the buoyancy of the magnetic float at the bottom of the measuring cylinder, the magnetic float will remain stably positioned at the bottom of the measuring cylinder. If it is necessary to float the magnetic float to the surface of the water tank for use with the resistance chain to measure the tank depth, the winding cylinder is rotated to retract the bead assembly, which is then rewound to the outer wall of the winding cylinder. The magnetic float then rises with the water level and falls with the water level, thus enabling it to work with the resistance chain for water depth measurement. The winding groove extends along the axial direction of the winding cylinder in a helical shape with a constant slope; that is, the extension direction of the winding groove is at an angle to the axis of the winding cylinder. This allows the bead to move stably within the winding groove a in a direction inclined to the axis, thus limiting the movement of the bead. Along the axis of the winding cylinder, the outer radial direction of the winding cylinder tapers towards the handle, and the through-hole is higher than the vent pipe. During chain winding, the beaded ribbon assembly is guided to be wound in an orderly and neat layered manner within the cylinder, preventing mutual compression and misalignment, thus achieving stable storage when not in use. Secondly, during chain unwinding, this structure, in conjunction with gravity, provides a constant reverse torque, keeping the beaded ribbon assembly under constant, slight tension, effectively preventing tangling and knotting caused by rope slack. This application, by setting up a winding cylinder, straightens and winds the beaded ribbon assembly, preventing tangling and knotting during redundant winding, ensuring the beaded ribbon assembly smoothly falls into and exits the measuring cylinder. Simultaneously, by setting a handle, the number of rotations of the winding cylinder is controlled to control the release length of the beaded ribbon assembly. The manually rotated handle improves the stability of the winding cylinder, thereby enhancing the stability of the beaded ribbon assembly falling into or exiting the measuring cylinder.

[0010] In one embodiment, the take-up and release assembly further includes a motor disposed within the housing, the motor being used to drive the winding cylinder to rotate about its axis, so that the beaded ribbon assembly can be wound around the outer wall of the winding cylinder or released by the winding cylinder.

[0011] In one embodiment, the take-up and release assembly further includes a winding disc and a rotating shaft. The rotating shaft passes through the winding cylinder, the motor, the winding disc, and is connected to the handle. The rotating shaft, the rotor of the motor, the winding disc, the winding cylinder, and the handle rotate synchronously. The bead ribbon assembly is connected to the outer wall of the winding disc. The winding disc has an arc-shaped groove in its circumference for accommodating the bead ribbon assembly.

[0012] In one embodiment, the retraction assembly further includes a position sensor and a controller. The position sensor is disposed at one end of the housing near the handle and is used to monitor the distance between one end of the beaded belt assembly and the handle. The controller is connected to both the position sensor and the motor and is used to drive the motor or turn off the motor based on the data from the position sensor.

[0013] In one embodiment, the gravity bead chain positioning and guiding mechanism further includes a guide tube;

[0014] One end of the guide tube is connected to the through hole, and the other end extends into the exhaust pipe, so that the beaded assembly can enter the exhaust pipe through the guide tube.

[0015] In one embodiment, the guide tube is made of a flexible material so that the portion of the guide tube extending into the exhaust pipe can bend and drop to form a smoothly transitioning arc-shaped guide channel.

[0016] In one embodiment, the gravity bead chain positioning and guiding mechanism further includes a positioning and fastening component, which includes a positioning pin and a fastener. One end of the positioning pin is connected to the outer wall of the guide tube, and the other end is arc-shaped and adapted to the outer wall of the measuring cylinder. The fastener moves and engages with the outer wall of the exhaust pipe and can abut against the positioning pin so that the positioning pin abuts against the outer wall of the measuring cylinder.

[0017] In one embodiment, the beaded assembly includes: a plurality of beads, a safety backup rope, a main load-bearing rope, and a first fixing member. The safety backup rope and the main load-bearing rope are sequentially threaded through the plurality of beads. The length of the safety backup rope is greater than the length of the main load-bearing rope. One end of the safety backup rope and the main load-bearing rope is connected to the winding cylinder, and the other end is connected to the first fixing member. The plurality of beads are located between the first fixing member and the winding cylinder.

[0018] In one embodiment, the bead assembly includes a plurality of second fasteners located between two adjacent beads and abutting against the beads near the side of the winding cylinder. The safety backup rope and the main load-bearing rope pass through the second fasteners and are connected to the second fasteners.

[0019] In one embodiment, the outer radial direction of the bead tapers toward the winding cylinder along the extension direction of the safety backup rope.

[0020] An embodiment of this application also provides a float level detector, which includes: a magnetic float and the gravity bead chain positioning and guiding mechanism;

[0021] The magnetic float is located inside the measuring cylinder, and the end of the magnetic float opposite the bottom of the measuring cylinder has a dome. The bead assembly is coiled around the dome and the inner wall of the measuring cylinder in the circumferential direction.

[0022] In actual use, the aforementioned float level detector requires the magnetic float to descend to a certain height. Rotating the handle rotates the winding cylinder, releasing the bead assembly. The bead assembly extends or retracts into the housing through through-hole a, winding down or back onto the winding cylinder. After extending into the vent pipe, the bead assembly falls onto the upper part of the magnetic float, located below the flange. The flange is located at the top of the measuring cylinder. By changing the number of rotations of the winding cylinder, the length of the released bead assembly is changed, thus altering the length of the bead assembly falling onto the upper part of the magnetic float. The weight of the magnetic float allows it to be positioned at different heights within the water tank. If the weight of the bead assembly is greater than or equal to the buoyancy of the magnetic float at the bottom of the measuring cylinder, the magnetic float will remain stably positioned at the bottom of the measuring cylinder. If the magnetic float needs to float to the surface of the water tank for use with the resistance chain to measure the tank depth, the winding cylinder is rotated to retract the bead assembly, which is then rewound to the outer wall of the winding cylinder. The magnetic float then rises with the water level and falls with the water level, thus enabling it to work with the resistance chain to measure the tank depth. The winding groove extends along the axial direction of the winding cylinder in a helical shape with a constant slope, meaning the extension direction of the winding groove is at an angle to the axis of the winding cylinder. This allows the bead to move stably within the winding groove a in a direction inclined to the axis, thus limiting the movement of the bead. Along the axis of the winding cylinder, the outer radial direction of the winding cylinder tapers towards the handle, and the through-hole is higher than the vent pipe. During chain winding, the beaded ribbon assembly is guided to be wound in an orderly and neat layered manner within the cylinder, preventing mutual compression and misalignment, thus achieving stable storage when not in use. Secondly, during chain unwinding, this structure, in conjunction with gravity, provides a constant reverse torque, keeping the beaded ribbon assembly under constant, slight tension, effectively preventing tangling and knotting caused by rope slack. This application, by setting up a winding cylinder, straightens and winds the beaded ribbon assembly, preventing tangling and knotting during redundant winding, ensuring the beaded ribbon assembly smoothly falls into and exits the measuring cylinder. Simultaneously, by setting a handle, the number of rotations of the winding cylinder is controlled to control the release length of the beaded ribbon assembly. The manually rotated handle improves the stability of the winding cylinder, thereby enhancing the stability of the beaded ribbon assembly falling into or exiting the measuring cylinder. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the measuring cylinder.

[0024] Figure 2 This is a schematic diagram of the resistor chain principle.

[0025] Figure 3 This is a schematic diagram of a float level detector and a measuring cylinder according to one embodiment.

[0026] Figure 4 for Figure 3 A cross-sectional view of the inner shell.

[0027] Figure 5 for Figure 3 A schematic diagram of the guide tube.

[0028] Figure 6 for Figure 3 A schematic diagram of the middle bead belt assembly.

[0029] Figure 7 for Figure 3 A schematic diagram of the beaded assembly at the top of the magnetic float.

[0030] Explanation of icon numbers:

[0031] 10- Gravity bead chain positioning and guiding mechanism;

[0032] 100 - Beaded belt assembly; 110 - Bead body; 120 - Safety backup rope; 130 - Main load-bearing rope; 140 - First fastener; 150 - Second fastener;

[0033] 200 - Retractable assembly; 210 - Winding cylinder; 210a - Winding groove; 220 - Motor; 230 - Handle; 240 - Housing; 240a - Through hole; 250 - Position sensor; 260 - Winding disc; 270 - Shaft;

[0034] 300-Guide tube;

[0035] 400 - Positioning and fastening assembly; 410 - Positioning pin; 420 - Fastener;

[0036] 20 - Float level detector; 21 - Magnetic float;

[0037] 30-Measuring cylinder; 31-Flange; 32-Exhaust pipe; 33-Resistor chain; 34-Resistor; 35-Magnetic switch; 36-Signal processing unit; 37-Water tank. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0039] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0044] The core water pool 37 of nuclear power unit 220 uses a float level detector 20 for level measurement. For example... Figure 1 As shown, the float level detector 20 is fixed inside the measuring cylinder 30 by a flange 31. The measuring cylinder 30 has a flange 31 on its top and an exhaust pipe 32 on its side wall. Figure 1 and Figure 2 As shown, a magnetic float 21 containing a permanent magnet floats in the water near the resistive chain 33 inside the measuring cylinder 30. This float level detector 20 can also be called a resistive chain 33 level detector. The resistive chain 33 contains multiple resistors 34 connected in series, with a magnetic switch 35 (such as a reed switch) connecting the nodes between adjacent resistors 34. As the magnetic float 21 reaches different heights with the water level, the magnetic field of its internal permanent magnet will open the magnetic switch 35 at that level. After the magnetic switches 35 at different positions are turned on, different numbers of resistors 34 are connected to the circuit, thereby converting the water level signal into an electrical signal. The signal processing unit 36 ​​obtains the number of resistors 34 connected to the circuit through the resistance value, and finally determines the water level at that time.

[0045] See Figure 3 , Figure 3 The diagram shows a structural schematic of the gravity bead chain positioning and guiding mechanism 10, float and measuring cylinder 30 in cooperation in one embodiment of the present application. The gravity bead chain positioning and guiding mechanism 10 provided in one embodiment of the present application includes: bead belt assembly 100 and take-up and release assembly 200.

[0046] See Figure 3 and Figure 4 In the aforementioned gravity bead chain positioning and guiding mechanism 10, the take-up and release assembly 200 includes: a winding cylinder 210, a housing 240, and a handle 230. The winding cylinder 210 is disposed inside the housing 240, and the handle 230 is disposed at one end of the housing 240 along the axis of the winding cylinder 210 and connected to the winding cylinder 210. A through hole 240a is provided on the side wall of the end of the housing 240 opposite to the handle 230. One end of the bead chain assembly 100 is connected to the winding cylinder 210, and the other end can enter the measuring cylinder 30 through the exhaust pipe 32 of the measuring cylinder 30, so that the part of the bead chain assembly 100 entering the measuring cylinder 30 is located between the magnetic float 21 and the upper flange. The outer wall of the winding cylinder 210 is provided with a winding groove 210a. The winding groove 210a extends along the axial direction of the winding cylinder 210 in a spiral shape with a constant slope, that is, the extension direction of the winding groove 210a is at an angle to the axis of the winding cylinder 210, and one end of the winding groove 210a is connected to the through hole 240a, so that the bead 110 can move stably in the winding groove 210a in a direction inclined to the axis, thereby limiting the movement of the bead 110. Along the axis of the winding cylinder 210, the outer radial direction of the winding cylinder 210 tapers towards the end near the handle 230, and the through hole 240a is higher than the exhaust pipe 32.

[0047] In actual use, when the magnetic float 21 needs to be lowered to a certain height, the aforementioned gravity bead chain positioning and guiding mechanism 10 rotates the winding cylinder 210 via the handle 230, releasing the bead belt assembly 100. The bead belt assembly 100 extends or retracts into the housing 240 through the through hole 240a, winding down or back onto the winding cylinder 210. After extending into the exhaust pipe 32, the bead belt assembly 100 falls onto the upper part of the magnetic float 21 and is located below the flange 31, which is located at the top of the measuring cylinder 30. By changing the number of rotations of the winding cylinder 210, the length of the released bead belt assembly 100 is changed, thereby changing the position of the bead belt assembly 100 above the magnetic float 21. The length of the magnetic float 21 is adjusted to change the gravity acting on it, thus allowing the magnetic float 21 to be placed at different heights within the water tank 37. If the gravity of the bead assembly 100 is greater than or equal to the buoyancy of the magnetic float 21 at the bottom of the measuring cylinder 30, the magnetic float 21 will be stably positioned at the bottom of the measuring cylinder 30. If it is necessary to float the magnetic float 21 to the surface of the water tank 37 to cooperate with the resistance chain 33 for water tank 37 depth measurement, the winding cylinder 210 is rotated to retract the bead assembly 100, and then rewinds it to the outer wall of the winding cylinder 210. The magnetic float 21 can then rise with the water level and fall with the water level to cooperate with the resistance chain 33 for water tank 37 depth measurement. The winding groove 210a extends along the axial direction of the winding cylinder 210 in a spiral shape with a constant slope, meaning the extension direction of the winding groove 210a is at an angle to the axis of the winding cylinder 210. This allows the bead 110 to move stably within the winding groove 210a in a direction inclined to the axis, thus limiting the movement of the bead 110. Along the axis of the winding cylinder 210, the outer radial direction of the winding cylinder 210 tapers towards the end near the handle 230, and the through hole 240a is higher than the exhaust pipe 32. When winding the chain, this structure guides the bead ribbon assembly 100 to be wound in an orderly and neat layered manner within the cylinder, preventing the bead ribbon assembly 100 from squeezing and misaligning with each other, thus achieving stable storage when not in use. Secondly, when unwinding the chain, this structure, in conjunction with gravity, provides a constant reverse torque, keeping the bead ribbon assembly 100 under constant, slight tension, thereby effectively preventing tangling and knotting caused by rope slack. This application uses a winding cylinder 210 to straighten and wind the beaded tape assembly 100, thereby preventing tangling and knotting during redundant winding and ensuring that the beaded tape assembly falls smoothly into or out of the measuring cylinder 30. At the same time, by setting a handle 230, the number of rotations of the winding cylinder 210 is controlled to control the release length of the beaded tape assembly 100. The stability of the winding cylinder 210 is improved by manually rotating the handle 230, thereby improving the stability of the beaded tape assembly falling into or out of the measuring cylinder 30.

[0048] See Figure 3 and Figure 4In one embodiment, the take-up and release assembly 200 further includes a motor 220 disposed within the housing 240. The motor 220 drives the winding cylinder 210 to rotate around its axis, so that the bead ribbon assembly 100 can be wound around the outer wall of the winding cylinder 210 or released by the winding cylinder 210. The motor 220 drives the winding cylinder 210 to rotate automatically, and the number of rotations of the winding cylinder 210 can be accurately controlled to control the release length of the bead ribbon assembly 100. When the motor 220 malfunctions, the rotation of the motor 220 can be stopped, and the winding cylinder 210 can be rotated by rotating the handle 230. The stability of the winding cylinder 210 can be improved by manually rotating the handle 230, thereby improving the stability of the bead ribbon assembly falling into or out of the measuring cylinder 30.

[0049] Specifically, the take-up and release assembly 200 also includes a winding disc 260 and a rotating shaft 270. The rotating shaft 270 passes through the winding cylinder 210, the motor 220, the winding disc 260 and is connected to the handle 230. The rotor of the rotating shaft 270 and the motor 220, the winding disc 260, the winding cylinder 210 and the handle 230 rotate synchronously. The safety backup rope 120 and the main load-bearing rope 130 of the bead belt assembly 100 are connected to the outer wall of the winding disc 260. The winding disc 260 has an arc-shaped groove in its circumference to accommodate part of the beads 110.

[0050] See Figure 3 and Figure 4 In one embodiment, the retraction assembly 200 further includes a position sensor 250 and a controller. The position sensor 250 is located at the end of the housing 240 near the handle 230 and is used to monitor the distance between one end of the beaded ribbon assembly 100 and the handle 230. The position sensor 250 (such as a Hall sensor or photoelectric sensor) is fixedly mounted on the housing 240, with its sensing end facing a specific position on the winding drum 210. The controller is connected to both the position sensor 250 and the motor, and is used to drive or shut down the motor based on the data from the position sensor. This position corresponds to the limit position where the beaded ribbon assembly 100 is about to be fully retracted. When the beaded ribbon assembly 100 (or its trigger) moves to and approaches the sensor, the sensor sends a signal. Upon receiving this signal, the controller immediately cuts off the power to the motor 220, commanding the motor 220 to stop operating. This design constitutes a reliable end-of-life protection system, fundamentally preventing accidents such as breakage of the beaded ribbon assembly 100 and stalling and burning of the motor 220 due to excessive pulling.

[0051] See Figure 4 and Figure 5 In one embodiment, the gravity bead chain positioning and guiding mechanism 10 further includes a guide tube 300. One end of the guide tube 300 is connected to the through hole 240a, and the other end extends into the exhaust pipe 32, so that the bead belt assembly 100 can enter the exhaust pipe 32 through the guide tube 300 and then enter the measuring cylinder 30.

[0052] In this embodiment, the beaded ribbon assembly 100 extends out of or retracts into the housing 240 through the through hole 240a to wind down from or back onto the winding cylinder 210. One end of the guide tube 300 is connected to the inside of the housing 240, and the other end is connected to the exhaust pipe 32. The beaded ribbon assembly 100 moves to the exhaust pipe 32 through the guide tube 300, enters the exhaust pipe 32, and then enters the measuring cylinder 30, falling onto the magnetic float 21, or retracts into the housing 240 along the guide tube 300. This allows the beaded ribbon assembly 100 to move along the guide tube 300, preventing the beaded ribbon assembly 100 from tangling, thereby enabling the beaded ribbon assembly 100 to be stably wound or released.

[0053] When the beaded ribbon assembly 100 enters the housing, the end of the beaded ribbon assembly 100 near the measuring cylinder 30 is aligned with the through hole 240a, so that when the beaded ribbon assembly 100 is released, it can smoothly pass through the through hole 240a and enter the guide tube 300, then enter the exhaust pipe 32 along the guide tube 300, and finally enter the measuring cylinder 30.

[0054] See Figure 4 and Figure 5 In one embodiment, the guide tube 300 is made of a flexible material, allowing the portion of the guide tube 300 extending into the exhaust pipe 32 to bend and droop, forming a smoothly transitioning arc-shaped guide channel. This allows the beaded assembly 100 within the guide tube 300, when it reaches the guide tube 300 located between the measuring cylinder 30 and the exhaust pipe 32, to smoothly pass through the bend in the flexible guide tube 300 caused by gravity, and enter the measuring cylinder 30. Furthermore, it can smoothly exit the measuring cylinder 30 and enter the exhaust pipe 32, preventing jamming or wear at the bend, which could lead to inaccurate weight readings of the beaded assembly 100 and subsequent inaccurate measurements due to wear.

[0055] See Figure 4 and Figure 5 In one embodiment, the gravity bead chain positioning guide mechanism 10 further includes a positioning fastening component 400, which includes a positioning pin 410 and a fastener 420. One end of the positioning pin 410 is connected to the outer wall of the guide tube 300, and the other end is arc-shaped and adapted to the outer wall of the measuring cylinder 30. The fastener 420 is movablely engaged with the outer wall of the exhaust pipe 32 and can abut against the outer wall of the positioning pin 410 so that the positioning pin 410 abuts against the outer wall of the measuring cylinder 30.

[0056] In this embodiment, during the process of extending the guide tube 300 into the exhaust pipe 32 and fixing it to the exhaust pipe 32, the positioning pin 410 is fixed at a fixed position on the guide tube 300. The other end of the positioning pin 410 is arc-shaped and adapted to the outer wall of the measuring cylinder 30. After extending the guide tube 300 into the exhaust pipe 32 to a certain distance, the arc of the positioning pin 410 abuts against the outer wall of the measuring cylinder. When the operator feels that the entire arc surface of the positioning pin 410 is completely in contact with the exhaust pipe 32 and cannot be moved forward, it indicates that the guide tube 300 has reached the designed installation depth. At this time, part of the guide tube 300 is located inside the measuring cylinder 30 and bends downward. Then, by tightening the fastener 420, the fastener 420 abuts against the outer wall of the positioning pin 410, thereby abutting the positioning pin 410 against the outer wall of the measuring cylinder 30 to achieve a snap-fit, thereby fixing the specific position of the guide tube 300 to the measuring cylinder 30.

[0057] Specifically, the locating pin 410 can also be partially annular, and the fastener 420 can also be a locating pin.

[0058] See Figure 6 In one embodiment, the beaded assembly 100 includes: a plurality of beads 110, a safety backup rope 120, a main load-bearing rope 130, and a first fixing member 140. The safety backup rope 120 and the main load-bearing rope 130 are sequentially threaded through the plurality of beads 110. The length of the safety backup rope 120 is greater than the length of the main load-bearing rope 130. One end of the safety backup rope 120 and the main load-bearing rope 130 is connected to the winding cylinder 210, and the other end is connected to the first fixing member 140. The plurality of beads 110 are located between the first fixing member 140 and the winding cylinder 210.

[0059] In this embodiment, the bead 110 is connected to the safety backup rope 120 and the main load-bearing rope 130 and is limited by the first fixing member 140, so that the bead 110 can be stably positioned between the first fixing member 140 and the winding drum 210. Since the length of the safety backup rope 120 is greater than the length of the main load-bearing rope 130, the main load-bearing rope 130 bears the weight during operation, while the safety backup rope 120 is in a slack state. When the main load-bearing rope 130 breaks due to wear or accident, the safety backup rope 120 is stressed. At this time, the multiple beads 110 are still fixed on the safety backup rope 120 to prevent the beads 110 from scattering due to accidental breakage of the load-bearing rope, which could cause a production accident.

[0060] See Figure 6In one embodiment, the bead belt assembly 100 includes a plurality of second fasteners 150, which are located between two adjacent beads 110 and abut against the bead 110 near the side of the winding cylinder 210. A safety backup rope 120 and a main load-bearing rope 130 are threaded through and connected to the second fasteners 150. Specifically, a plurality of second fasteners 150 are provided at the bottom and middle of the bead belt assembly 100 to anchor the beads 110 at critical locations.

[0061] See Figure 6 In one embodiment, along the extension direction of the safety backup rope 120, the outer radial direction of the bead 110 gradually expands away from the winding cylinder 210. Specifically, a plurality of beads 110 on the side of the bead assembly 100 near the winding cylinder 210 form a guide section, and along the extension direction of the safety backup rope 120, the outer radial direction of the beads 110 in the guide section gradually narrows towards the winding cylinder 210. The beads 110 outside the guide section form a gravity section, and the outer diameter of the beads 110 in the gravity section remains consistent.

[0062] See Figure 3 and Figure 4 In one embodiment, the outer wall of the winding cylinder 210 is provided with a winding groove 210a. The extension direction of the winding groove 210a is at an angle to the axis of the winding cylinder 210, and one end of the winding groove 210a is connected to the through hole 240a, so that the bead 110 can move stably in the winding groove 210a along the direction inclined to the axis, thereby limiting the movement of the bead 110.

[0063] Along the axis of the winding cylinder 210, the outer radial direction of the winding cylinder 210 gradually narrows towards the end near the handle 230, and the through hole 240a is higher than the exhaust pipe 32. When winding the chain, it can guide the beads 110 to be wound in an orderly and neat layered manner inside the cylinder, avoiding mutual compression and misalignment of the beads 110, and achieving stable storage when not in use; secondly, when unwinding the chain, this structure, in conjunction with gravity, provides a constant reverse torque for the motor 220, keeping the main load-bearing rope 130 in a constant state of slight tension, thereby effectively avoiding entanglement and knotting caused by rope slack.

[0064] See Figure 3 and Figure 4 An embodiment of this application also provides a float level detector 20, which includes a magnetic float 21 and a gravity bead chain positioning and guiding mechanism 10. The magnetic float 21 is located inside the measuring cylinder 30, and the end of the magnetic float 21 facing away from the bottom of the measuring cylinder 30 has a dome. The bead chain assembly 100 is wound around the dome and the inner wall of the measuring cylinder 30 along the circumference of the measuring cylinder 30.

[0065] In actual use, when the magnetic float 21 needs to be lowered to a certain height, the handle 230 is rotated to rotate the winding cylinder 210, releasing the bead assembly 100. The bead assembly 100 extends or retracts into the housing 240 through the through hole 240a, winding down or back onto the winding cylinder 210. After extending into the exhaust pipe 32, the bead assembly 100 falls onto the upper part of the magnetic float 21 and is located below the flange 31, which is located at the top of the measuring cylinder 30. By changing the number of rotations of the winding cylinder 210, the length of the released bead assembly 100 is changed, thereby changing the position of the bead assembly 100 falling onto the upper part of the magnetic float 21. The length is adjusted to change the gravity acting on the magnetic float 21, thereby allowing the magnetic float 21 to be placed at different heights within the water tank 37. If the gravity of the bead assembly 100 is greater than or equal to the buoyancy of the magnetic float 21 at the bottom of the measuring cylinder 30, the magnetic float 21 will be stably positioned at the bottom of the measuring cylinder 30. If it is necessary to float the magnetic float 21 to the surface of the water tank 37 to cooperate with the resistance chain 33 for water tank 37 depth measurement, the winding cylinder 210 is rotated to retract the bead assembly 100, and then rewinds it to the outer wall of the winding cylinder 210. The magnetic float 21 can then rise with the water level and fall with the water level to cooperate with the resistance chain 33 for water tank 37 depth measurement. The winding groove 210a extends along the axial direction of the winding cylinder 210 in a spiral shape with a constant slope, meaning the extension direction of the winding groove 210a is at an angle to the axis of the winding cylinder 210. This allows the bead 110 to move stably within the winding groove 210a in a direction inclined to the axis, thus limiting the movement of the bead 110. Along the axis of the winding cylinder 210, the outer radial direction of the winding cylinder 210 tapers towards the end near the handle 230, and the through hole 240a is higher than the exhaust pipe 32. When winding the chain, this structure guides the bead ribbon assembly 100 to be wound in an orderly and neat layered manner within the cylinder, preventing the bead ribbon assembly 100 from squeezing and misaligning with each other, thus achieving stable storage when not in use. Secondly, when unwinding the chain, this structure, in conjunction with gravity, provides a constant reverse torque, keeping the bead ribbon assembly 100 under constant, slight tension, thereby effectively preventing tangling and knotting caused by rope slack. This application uses a winding cylinder 210 to straighten and wind the beaded tape assembly 100, thereby preventing tangling and knotting during redundant winding and ensuring that the beaded tape assembly falls smoothly into or out of the measuring cylinder 30. At the same time, by setting a handle 230, the number of rotations of the winding cylinder 210 is controlled to control the release length of the beaded tape assembly 100. The stability of the winding cylinder 210 is improved by manually rotating the handle 230, thereby improving the stability of the beaded tape assembly falling into or out of the measuring cylinder 30.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A gravity bead chain positioning and guiding mechanism, characterized in that, The gravity bead chain positioning and guiding mechanism includes: a bead belt assembly and a take-up and release assembly; The retractable assembly includes: a winding cylinder, a housing, and a handle; the winding cylinder is disposed inside the housing, and the handle is disposed at one end of the housing along the axis of the winding cylinder and connected to the winding cylinder, for driving the winding cylinder to rotate around its axis; a through hole is provided on the side wall of the end of the housing opposite to the handle; One end of the beaded ribbon assembly is connected to the winding cylinder, and the other end can enter the measuring cylinder through the exhaust pipe of the measuring cylinder, so that the part of the beaded ribbon assembly entering the measuring cylinder is located between the magnetic float and the upper flange; the outer wall of the winding cylinder is provided with a winding groove, and the winding groove extends along the axial direction of the winding cylinder in the shape of a helical line with a constant slope. The inner wall of the winding groove is adapted to the beaded ribbon assembly, and one end of the winding groove communicates with the through hole; along the axis of the winding cylinder, the outer radial direction of the winding cylinder tapers towards the handle, and the through hole is higher than the exhaust pipe.

2. The gravity bead chain positioning and guiding mechanism according to claim 1, characterized in that, The take-up and release assembly also includes a motor disposed inside the housing. The motor is used to drive the winding cylinder to rotate around its axis, so that the beaded ribbon assembly can be wound around the outer wall of the winding cylinder or released by the winding cylinder.

3. The gravity bead chain positioning and guiding mechanism according to claim 2, characterized in that, The take-up and release assembly also includes a winding disc and a rotating shaft. The rotating shaft passes through the winding cylinder, the motor, and the winding disc and is connected to the handle. The rotating shaft, the rotor of the motor, the winding disc, the winding cylinder, and the handle rotate synchronously. The bead ribbon assembly is connected to the outer wall of the winding disc. The winding disc has an arc-shaped groove in its circumference to accommodate the bead ribbon assembly.

4. The gravity bead chain positioning and guiding mechanism according to claim 2, characterized in that, The retraction assembly also includes a position sensor and a controller. The position sensor is located at one end of the housing near the handle and is used to monitor the distance between one end of the beaded belt assembly and the handle. The controller is connected to both the position sensor and the motor and is used to drive the motor or turn it off based on the data from the position sensor.

5. The gravity bead chain positioning and guiding mechanism according to claim 1, characterized in that, The gravity bead chain positioning and guiding mechanism also includes a guide tube; One end of the guide tube is connected to the through hole, and the other end extends into the exhaust pipe, so that the beaded assembly can enter the exhaust pipe through the guide tube.

6. The gravity bead chain positioning and guiding mechanism according to claim 5, characterized in that, The guide tube is made of a flexible material so that the part of the guide tube extending into the exhaust pipe can bend and drop to form a smoothly transitioning arc-shaped guide channel.

7. The gravity bead chain positioning and guiding mechanism according to claim 5, characterized in that, The gravity bead chain positioning and guiding mechanism further includes a positioning and fastening assembly, which includes a positioning pin and a fastener. One end of the positioning pin is connected to the outer wall of the guide tube, and the other end is arc-shaped and adapted to the outer wall of the measuring cylinder. The fastener moves and engages with the outer wall of the exhaust pipe and can abut against the positioning pin so that the positioning pin abuts against the outer wall of the measuring cylinder.

8. The gravity bead chain positioning and guiding mechanism according to claim 1, characterized in that, The beaded assembly includes: multiple beads, a safety backup rope, a main load-bearing rope, and a first fixing member. The safety backup rope and the main load-bearing rope are sequentially threaded through the multiple beads. The length of the safety backup rope is greater than the length of the main load-bearing rope. One end of the safety backup rope and the main load-bearing rope is connected to the winding drum, and the other end is connected to the first fixing member. The multiple beads are located between the first fixing member and the winding drum.

9. The gravity bead chain positioning and guiding mechanism according to claim 8, characterized in that, The bead assembly includes a plurality of second fasteners, which are located between two adjacent beads and abut against the beads near the side of the winding cylinder. The safety backup rope and the main load-bearing rope are threaded through the second fasteners and connected to them.

10. The gravity bead chain positioning and guiding mechanism according to claim 8, characterized in that, Along the extension direction of the safety backup rope, the outer radial direction of the bead gradually tapers towards the winding cylinder.

11. A float-type liquid level detector, characterized in that, The float level detector includes: a magnetic float and a gravity bead chain positioning and guiding mechanism as described in any one of claims 1-10; The magnetic float is located inside the measuring cylinder, and the end of the magnetic float opposite the bottom of the measuring cylinder has a dome. The bead assembly is coiled around the dome and the inner wall of the measuring cylinder in the circumferential direction.

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