Magneto-rheological damping device of elevator rear counterweight unbalance loading prevention sensor

Abstract

The magneto-rheological damping device comprises an installation base and a force transmission piece, an installation channel for movably installing the force transmission piece is formed in the installation base, the upper end of the force transmission piece is connected with a pressure sensor, the lower end of the force transmission piece is connected with a stress piece, and a damping medium cavity surrounding the installation channel is formed in the installation base. The damping medium cavity is filled with a controllable rheological material and a magnetic field generating structure; a flexible barrier film is arranged between the force transmission piece and the controllable rheological material, and the controllable rheological material is physically isolated from the force transmission piece through the flexible barrier film; when the force transmission piece shakes transversely, the flexible barrier film transmits vibration to the controllable rheological material, and the magnetic field generation structure is powered on to enable the viscosity of the controllable rheological material to be increased so as to restrain the vibration. The damping medium cavity surrounding the mounting channel is formed in the mounting seat, the controllable rheological material is filled in the damping medium cavity, the magnetic field generating structure is arranged, the characteristic that the viscosity of the controllable rheological material is variable under the action of a magnetic field is ingeniously utilized, and efficient suppression of transverse vibration of the force transmission piece is achieved.

Description

Technical Field

[0001] This utility model particularly relates to a magnetorheological vibration damping device for an anti-eccentric load sensor for the rear counterweight of an elevator. Background Technology

[0002] In the field of elevator safety monitoring, the anti-eccentric load monitoring device of the counterweight system is an important component for ensuring the safe operation of elevators. Traditional anti-eccentric load monitoring devices typically use a transmission component structure to connect the pressure sensor. The mounting base has a movable hole, with one end of the transmission component connected to the pressure sensor and the other end transmitting the load via a steel wire rope. However, this traditional structure has many technical problems in practical applications, seriously affecting the performance and reliability of the monitoring device.

[0003] First, the mechanical contact of the transmission components within the moving hole generates Coulomb friction. This friction can lead to errors in axial force transmission. At low speeds, Coulomb friction can also induce a "stick-slip effect," causing intermittent pauses and sudden slippage in the transmission components, further interfering with accurate force transmission. Furthermore, with prolonged use, the wear on the inner wall of the moving hole becomes increasingly severe, further exacerbating measurement errors and reducing the accuracy and stability of the monitoring device.

[0004] Secondly, the movement of the wire rope inevitably induces vibrations, which are directly transmitted to the pressure sensor through the transmission components, interfering with the measurement results. Although existing technologies use rubber bushings for vibration damping, their damping effect is significantly insufficient. At low frequencies, the vibration suppression effect of rubber bushings is poor. Furthermore, at high temperatures, the hardness of the rubber bushings changes, leading to unstable vibration damping performance and failing to effectively guarantee the measurement accuracy of the pressure sensor.

[0005] In view of the many problems existing in the traditional anti-eccentric load monitoring device, this utility model aims to propose an improved monitoring device to solve the problems of large measurement error and unstable performance caused by Coulomb friction, wear of moving holes and vibration transmission in the prior art, thereby improving the accuracy and reliability of anti-eccentric load monitoring of the elevator back counterweight system. Utility Model Content

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a magnetorheological vibration damping device for an anti-eccentric load sensor for the rear counterweight of an elevator.

[0007] To solve the aforementioned technical problems, this utility model adopts the following technical solution:

[0008] A magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor includes a mounting base and a force transmission component. The mounting base has an installation channel for the force transmission component to be movably installed. The upper end of the force transmission component is connected to a pressure sensor, and the lower end is connected to a force-bearing component. The mounting base has a damping medium cavity surrounding the installation channel, which is filled with a controllable rheological material and a magnetic field generating structure. A flexible barrier membrane is provided between the force transmission component and the controllable rheological material, physically isolating the controllable rheological material from the force transmission component. When the force transmission component sways laterally, the flexible barrier membrane transmits the vibration to the controllable rheological material, and the magnetic field generating structure is energized to increase the viscosity of the controllable rheological material to suppress the vibration.

[0009] Preferably, the magnetic field generating structure includes a honeycomb core layer, which is composed of multiple regular hexagonal units, the units are filled with the controllable rheological material, and the unit wall thickness is 0.1-0.3 mm; an electromagnetic coil group is provided on the outside of the honeycomb core layer.

[0010] Preferably, the controllable rheological material is a magnetorheological gel and magnetic particles.

[0011] Preferably, the flexible barrier film is a polyimide film.

[0012] Preferably, it also includes a vibration detection module and a control unit. The vibration detection module is used to detect the vibration direction and amplitude of the force transmission component, and the control unit is electrically connected to the electromagnetic coil group.

[0013] Preferably, the magnetic particles are carbonyl iron powder.

[0014] Preferably, a shielding layer is provided on the outside of the electromagnetic coil assembly.

[0015] The beneficial effects of this utility model are:

[0016] This utility model relates to a magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor. It cleverly utilizes the variable viscosity of the controllable rheological material under magnetic field by setting a damping medium cavity surrounding the mounting channel within the mounting base, filling it with a controllable rheological material, and incorporating a magnetic field generating structure. This achieves highly efficient suppression of lateral vibration of the force transmission component. When the force transmission component experiences lateral swaying, the vibration is transmitted to the controllable rheological material through a flexible barrier membrane. At this point, by controlling the energization of the magnetic field generating structure, the viscosity of the controllable rheological material increases, effectively hindering the transmission of vibration and reducing its impact on the measurement accuracy of the pressure sensor. This solves the problems of measurement errors caused by mechanical contact friction and poor vibration suppression in traditional devices. Simultaneously, the flexible barrier membrane further avoids direct contact between the force transmission component and the controllable rheological material, reducing mechanical wear, extending the device's service life, and improving the accuracy and reliability of elevator anti-eccentric load monitoring, providing a more effective guarantee for the safe operation of the elevator. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of a magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor.

[0019] Figure 2 for Figure 1 A magnified view of part A in the image;

[0020] Figure 3 for Figure 2 A magnified view of part B in the image. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0022] The orientation shown in the accompanying drawings should not be construed as limiting the specific protection scope of this utility model, but is only for reference and understanding of preferred embodiments. The product components shown in the drawings can be changed in position, increased in number, or simplified in structure.

[0023] The “connection” described in the specification and the “connection” relationship between the components shown in the accompanying drawings can be understood as a fixed connection, a detachable connection, or a connection that forms an integral unit; it can be a direct connection or a connection through an intermediate medium. Those skilled in the art can understand the connection relationship according to the specific circumstances and can derive different implementation methods such as screwing, riveting, welding, snap-fitting, or embedding to suitably replace the connection.

[0024] The directional terms such as up, down, left, right, top, and bottom mentioned in the instruction manual and the directions shown in the attached drawings indicate that the components can directly contact each other or contact each other through other features; for example, "up" can mean directly above or diagonally above, or it simply means above other objects; other directions can be understood by analogy.

[0025] The materials used to manufacture solid-shaped parts as shown in the specification and drawings may be metallic, non-metallic, or other synthetic materials. The machining processes used for solid-shaped parts may include stamping, forging, casting, wire cutting, laser cutting, injection molding, CNC milling, 3D printing, machining, etc. Those skilled in the art may adapt or combine the above materials and manufacturing processes according to different processing conditions, costs, and precision requirements.

[0026] A magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor includes a mounting base 1 and a force transmission component 2. The mounting base 1 has an installation channel 11 for the force transmission component 2 to be movably installed. The upper end of the force transmission component 2 is connected to a pressure sensor 3, and the lower end is connected to a force-bearing component 4. The mounting base 1 has a damping medium cavity 12 surrounding the installation channel 11. The damping medium cavity 12 is filled with a controllable rheological material 5 and a magnetic field generating structure 6. A flexible barrier membrane 7 is provided between the force transmission component 2 and the controllable rheological material 5, which physically isolates the controllable rheological material 5 from the force transmission component 2. When the force transmission component 2 sways laterally, the flexible barrier membrane 7 transmits the vibration to the controllable rheological material 5. The magnetic field generating structure 6 is energized to increase the viscosity of the controllable rheological material 5 to suppress the vibration.

[0027] Furthermore, the magnetic field generating structure 6 includes a honeycomb core layer 61, which is composed of multiple regular hexagonal units, the units are filled with the controllable rheological material 5, and the unit wall thickness is 0.1-0.3mm; an electromagnetic coil group 62 is provided on the outside of the honeycomb core layer 61.

[0028] Furthermore, the controllable rheological material 5 is a magnetorheological gel and magnetic particles.

[0029] Furthermore, the flexible barrier film 7 is a polyimide film.

[0030] Furthermore, it also includes a vibration detection module and a control unit. The vibration detection module is used to detect the vibration direction and amplitude of the force transmission component 2, and the control unit is electrically connected to the electromagnetic coil group 62.

[0031] Furthermore, the magnetic particles are carbonyl iron powder.

[0032] Furthermore, a shielding layer is provided on the outside of the electromagnetic coil assembly 62.

[0033] The working principle of this utility model is as follows:

[0034] This embodiment provides a vibration damping device for an elevator rear counterweight anti-eccentric load sensor. Its main structure includes a mounting base 1, a force transmission component 2, a pressure sensor 3, a force receiving component 4, a damping medium cavity 12, a controllable rheological material 5, a magnetic field generating structure 6, and a flexible barrier membrane 7. In addition, it also includes a vibration detection module and a control unit.

[0035] Structural composition

[0036] Mounting Base 1: Mounting Base 1 serves as the supporting structure for the entire device. Its installation position should ensure effective monitoring and mitigation of the off-center load vibration of the elevator's rear counterweight system. Specifically, Mounting Base 1 should be installed on the supporting structure of the elevator's rear counterweight system, close to the connection point of the counterweight device, to ensure direct sensing of the counterweight device's vibration and off-center load conditions. Mounting Base 1 has an internal installation channel 11 for the movable installation of the force transmission component 2. Mounting Base 1 is made of high-strength aluminum alloy, possessing excellent mechanical properties and corrosion resistance.

[0037] Force transmission component 2: Its upper end is connected to the pressure sensor 3, and its lower end is connected to the force receiving component 4. For example, when the force receiving component 4 is a steel wire rope, the steel wire rope force receiving component is connected to the force transmission component 2 through a dedicated connecting device. This connecting device typically includes a steel wire rope fixing clamp and a connecting nut to ensure a secure connection between the steel wire rope and the force transmission component 2. A radial gap of 0.1-0.3 mm is maintained between the force transmission component 2 and the controllable rheological material 5 in the damping medium cavity 12 to maintain a non-contact state before the vibration exceeds the limit.

[0038] Pressure sensor 3: Pressure sensor 3 is installed at the upper end of force transmission component 2 and is used to measure the axial force on force transmission component 2. Pressure sensor 3 can be a high-precision strain gauge type pressure sensor.

[0039] Force-bearing component 4: Force-bearing component 4 is installed at the lower end of force-transmitting component 2 and is used to transfer the load to force-transmitting component 2.

[0040] Vibration damping medium cavity 12: The vibration damping medium cavity 12 is disposed around the mounting channel 11 within the mounting base 1, and its interior is filled with a controllable rheological material 5. The vibration damping medium cavity 12 can be cylindrical in shape and is coaxially arranged with the mounting channel 11 to ensure that the controllable rheological material 5 can be evenly distributed.

[0041] Controllable rheological material 5: Controllable rheological material 5 is filled in the damping medium cavity 12, and its main components include magnetorheological gel and carbonyl iron powder. The particle size of the magnetic particles ranges from 5 to 10 μm, and the volume fraction is 20% to 30%. The magnetorheological gel exhibits liquid flow in the absence of a magnetic field, and its viscosity is approximately 1 kPa·s.

[0042] Magnetic field generating structure 6: The magnetic field generating structure 6 includes a honeycomb core layer 61 and an electromagnetic coil assembly 62. The honeycomb core layer 61 is composed of multiple regular hexagonal units, each filled with a controllable rheological material 5, and the unit wall thickness is 0.2 mm. The electromagnetic coil assembly 62 is located on the outside of the honeycomb core layer 61.

[0043] Flexible barrier membrane 7: The flexible barrier membrane 7 is positioned between the force transmission component 2 and the controllable rheological material 5 to physically isolate the two. The flexible barrier membrane 7 is made of polyimide film with a thickness of 0.05 mm, exhibiting good flexibility and high-temperature resistance. The design of the flexible barrier membrane 7 not only achieves physical isolation but also reduces the precision requirements of components during installation due to its flexibility, further improving installation tolerance.

[0044] Vibration detection module: The vibration detection module is used to detect the vibration direction and amplitude of the force transmission component 2. It adopts a high-precision acceleration sensor and can monitor the vibration of the force transmission component 2 in real time.

[0045] Control unit: The control unit is electrically connected to the electromagnetic coil group 62 and is used to control the energization state of the electromagnetic coil according to the signal of the vibration detection module, thereby adjusting the viscosity of the controllable rheological material 5.

[0046] Working principle

[0047] Initial state: No magnetic field.

[0048] In the absence of a magnetic field, the carbonyl iron powder particles with a particle size of 5-10 μm in the controllable rheological material 5 are randomly dispersed in the magnetorheological gel, exhibiting liquid flowability and a viscosity of approximately 1 kPa·s. At this time, the controllable rheological material 5 has good flowability, allowing the force transmission component 2 to move freely within the mounting channel 11, while maintaining a radial gap of 0.1-0.3 mm between it and the controllable rheological material 5, thus maintaining a non-contact state before vibration exceeds the limit.

[0049] Lateral vibration is triggered after a magnetic field is applied:

[0050] When the force transmission component 2 experiences lateral vibration during elevator operation, the vibration detection module monitors the vibration signal in real time and transmits the signal to the control unit. Based on the intensity and frequency of the vibration signal, the control unit controls the electromagnetic coil group 62 to be energized, generating a magnetic field.

[0051] Under the influence of a magnetic field, the carbonyl iron powder particles in the controllable rheological material 5 are magnetized, forming a three-dimensional network structure that hinders the flow of the gel.

[0052] When the force transmission component 2 vibrates laterally, the viscosity of the controllable rheological material 5 rapidly increases and the gel thickens, thereby suppressing the shaking of the force transmission component 2. This sudden change in viscosity is achieved through the structure of the magnetic particles, rather than mechanical restraint, thus avoiding the wear and measurement error problems caused by mechanical friction in traditional mechanical restraint devices.

[0053] When subjected to axial force:

[0054] When the force transmission component 2 only bears axial force, the magnetic field generating structure 6 does not operate, and the controllable rheological material 5 maintains its initial fluidity. The axial force is smoothly transmitted to the pressure sensor 3 through the force transmission component 2 without affecting the measurement accuracy.

[0055] Since the controllable rheological material 5 remains in a flowing state when subjected to axial force, the force transmission component 2 and the controllable rheological material 5 still maintain a radial gap, ensuring the smooth transmission of force and reducing mechanical wear.

[0056] The function of the shielding layer:

[0057] A shielding layer is set on the outside of the electromagnetic coil group 62, which can effectively prevent external magnetic field interference and ensure that the magnetic field of the magnetic field generating structure 6 acts only on the controllable rheological material 5, thereby improving the anti-interference ability and reliability of the device.

[0058] Based on the above technical solution, the control principle of the control unit is as follows: The control unit controls the energization state of the electromagnetic coil group 62 through the following steps according to the vibration signal provided by the vibration detection module: When the vibration detection module detects that the vibration frequency and amplitude of the force transmission component 2 exceed the threshold, the control unit controls the electromagnetic coil group 62 to be in the energized state.

[0059] This utility model relates to a magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor. It cleverly utilizes the variable viscosity of the controllable rheological material under magnetic field by setting a damping medium cavity surrounding the mounting channel within the mounting base, filling it with a controllable rheological material, and incorporating a magnetic field generating structure. This achieves highly efficient suppression of lateral vibration of the force transmission component. When the force transmission component experiences lateral swaying, the vibration is transmitted to the controllable rheological material through a flexible barrier membrane. At this point, by controlling the energization of the magnetic field generating structure, the viscosity of the controllable rheological material increases, effectively hindering the transmission of vibration and reducing its impact on the measurement accuracy of the pressure sensor. This solves the problems of measurement errors caused by mechanical contact friction and poor vibration suppression in traditional devices. Simultaneously, the flexible barrier membrane further avoids direct contact between the force transmission component and the controllable rheological material, reducing mechanical wear, extending the device's service life, and improving the accuracy and reliability of elevator anti-eccentric load monitoring, providing a more effective guarantee for the safe operation of the elevator.

[0060] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the present invention without departing from the principles and spirit of the present invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for explanation only and not for limiting the present invention, but rather the scope of protection is defined by the content of the claims.

Claims

1. A magnetorheological vibration damping device for an anti-eccentric load sensor for a counterweight in an elevator, comprising a mounting base (1) and a force transmission component (2), wherein the mounting base (1) has an installation channel (11) for the force transmission component (2) to be movably installed, the upper end of the force transmission component (2) is connected to a pressure sensor (3), and the lower end is connected to a force-bearing component (4), characterized in that: The mounting base (1) is provided with a damping medium cavity (12) surrounding the mounting channel (11). The damping medium cavity (12) is filled with a controllable rheological material (5) and a magnetic field generating structure (6). A flexible barrier membrane (7) is provided between the force transmission component (2) and the controllable rheological material (5). The flexible barrier membrane (7) physically isolates the controllable rheological material (5) from the force transmission component (2). When the force transmission component (2) sways laterally, the flexible barrier membrane (7) transmits the vibration to the controllable rheological material (5). The magnetic field generating structure (6) is energized to increase the viscosity of the controllable rheological material (5) to suppress the vibration.

2. The magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor according to claim 1, characterized in that, The magnetic field generating structure (6) includes a honeycomb core layer (61), which is composed of multiple regular hexagonal units, and the units are filled with the controllable rheological material (5). The unit wall thickness is 0.1-0.3 mm. An electromagnetic coil group (62) is provided on the outside of the honeycomb core layer (61).

3. The magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor according to claim 1, characterized in that, The controllable rheological material (5) is a magnetorheological gel and magnetic particles.

4. The magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor according to claim 1, characterized in that, The flexible barrier film (7) is a polyimide film.

5. The magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor according to claim 1, characterized in that, It also includes a vibration detection module and a control unit. The vibration detection module is used to detect the vibration direction and amplitude of the force transmission component (2), and the control unit is electrically connected to the electromagnetic coil group (62).

6. The magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor according to claim 3, characterized in that, The magnetic particles are carbonyl iron powder.

7. The magnetorheological vibration damping device for an elevator rear counterweight anti-eccentric load sensor according to claim 2, characterized in that, A shielding layer is provided on the outside of the electromagnetic coil assembly (62).

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