CN110552956B - Fully self-powered rolling bearing internal sensor data acquisition wireless transmission device - Google Patents

Abstract

A fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device, the bearing includes a bearing inner ring, a bearing rolling body, a rolling body cage, and a bearing outer ring, and is characterized in that it also includes a sensor and its conditioning circuit, A sensor data acquisition/output device composed of a sensor data acquisition circuit and a sensor data wireless output circuit, a self-powered power supply and a wireless signal repeater composed of an energy acquisition coil, an electric energy generator and a power management circuit. The invention can realize self-powered collection and wireless transmission of sensor data inside the bearing. The whole device does not need to be powered by an external power source or a battery. As long as the bearing is in a working state, the state data inside the bearing can be collected autonomously. During wireless query, sensor data can be transmitted wirelessly.

Description

Fully self-powered rolling bearing internal sensor data acquisition wireless transmission device

technical field

The invention relates to a rolling bearing, in particular to a fully self-powered rolling bearing internal sensing data acquisition wireless transmission device.

Background technique

Bearings are the core moving parts of mechanical systems. Realizing the condition monitoring of bearings is of great value to the product quality of mechanical manufacturing systems and the operational safety of mechanical motion systems. Since the bearing is a moving part, the technical difficulty in monitoring its state lies in directly obtaining the state information of the moving body. Due to the limitation of the bearing structure, it is generally not possible to monitor the internal state of the bearing in a non-contact way. Only sensors can be installed between the moving parts in the bearing, or even on the moving parts to obtain state information. In this way, the sensor and its data must be resolved. The power supply and data output link of the acquisition circuit are not suitable for bearing conditions because the cable is connected to the power supply, or the battery is powered, and the data is transmitted by wire.

SUMMARY OF THE INVENTION

The technical idea of the invention is: collecting the energy of the bearing rotation to provide power for sensing data collection and wireless output of the sensing data; the output of the sensing data adopts a wireless query method, and the query electromagnetic wave provides a carrier for the sensing output, and the sensing data passes through Controlled impedance modulation realizes the modulation of the inquiry electromagnetic wave, and this method greatly simplifies the circuit of data wireless transmission, and the power consumption is extremely low; the wireless signal repeater is arranged on the bearing instead of the wireless signal interrogator, because the wireless signal The relay has a simple structure, and the power consumption is much lower than that of the wireless signal interrogator. It can receive and forward the wireless inquiry signal of the wireless signal interrogator arranged at a long distance and transmit it to the inner ring of the bearing. The sensor data is amplified and relayed to the interrogator outside the bearing.

The purpose of the present invention is to provide a fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device. The device can realize self-powered collection and wireless transmission of sensor data inside the bearing. The whole device does not need to be powered by an external power supply or battery. As long as the bearing is in working state, it can autonomously collect the state data inside the bearing. When the interrogator outside the bearing During wireless query, sensor data can be transmitted wirelessly.

The technical solution of the present invention is as follows:

A fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device, the bearing includes a bearing inner ring, a bearing rolling body, a rolling body cage, and a bearing outer ring, and is characterized in that it also includes a sensor and its conditioning circuit, A sensor data acquisition/output device composed of a sensor data acquisition circuit and a sensor data output circuit, a self-powered power supply and a wireless signal repeater composed of an energy harvesting coil, an energy generator and a power management circuit;

The sensor data acquisition/output device is fixed at the position of the inner ring of the bearing that does not contact the rolling elements of the bearing, and the wireless signal repeater is installed at the position of the outer ring of the bearing that does not contact the rolling elements of the bearing;

Two permanent magnet arrays are respectively arranged on the two surfaces of the cage of the rolling element facing the inner ring and the outer ring of the bearing, which are respectively used as the inner ring electric energy generator and the outer ring electric energy generator:

One magnetic pole of the permanent magnet array arranged on the surface of the inner ring of the bearing is opposite to the energy harvesting coil installed outside the inner ring of the bearing, and the output end of the energy harvesting coil of the inner ring is connected to the power supply management circuit of the inner ring. The input end is connected, the output end of the inner circle power management circuit is connected with the power supply end of the sensor data acquisition/output device, and supplies power to the sensor data acquisition/output device, and the inner circle is powered by the power supply. The energy is collected from the rotation of the bearing inner ring relative to the rolling element cage;

One magnetic pole of the permanent magnet array arranged on the surface of the bearing outer ring faces the energy harvesting coil installed on the inner side of the bearing outer ring, and the output end of the outer ring energy harvesting coil is connected to the outer ring. The input end of the power management circuit is connected, and the output end of the outer ring power management circuit is connected with the power end of the wireless signal repeater to supply power for the wireless signal repeater, and the outer ring is self-powered from the power supply The energy is collected from the rotation of the bearing outer ring relative to the rolling element cage.

The sensors are selected according to bearing monitoring needs, including temperature, load, rotational speed, stress/strain, and vibration sensors.

The wireless signal repeater includes an outer antenna and an inner antenna, wherein the inner antenna is installed on the inner side of the outer ring.

The sensor data/collector can also be installed on the cage, so that the permanent magnet array used as the inner ring electric energy generator is installed outside the inner ring of the bearing, the inner ring energy collection coil and the inner ring power management circuit and sensor. The data/collector is installed on the cage together, and the output of the inner ring power management circuit supplies power to the sensor data/collector, and the rest of the sensor data is collected and wirelessly transmitted as described above.

The sensor data/collector can also be installed on the inner side of the outer ring, so that only the self-powered power supply of the outer ring is needed to supply power to the sensor data/collector and the wireless signal repeater at the same time, and the rest of the sensor data is collected, Wireless transmission is as described above.

The working principle of the device of the present invention is:

The sensor data acquisition/output device is installed on the inner ring of the bearing to directly collect the bearing working status data, and transmit it to the outer ring of the bearing when it is wirelessly queried by the interrogator outside the bearing; a wireless signal repeater is installed on the outer ring of the bearing, Receive the wireless query signal from outside the bearing and transmit it to the inner ring of the bearing, and at the same time amplify the received sensor data signal from the inner ring of the bearing and relay it to the interrogator outside the bearing; The electric energy generator is equipped with energy harvesting coils on the inner and outer rings of the bearing, which collects the motion energy of the bearing and forms two power sources through the power management circuit, which are the sensor data acquisition/transmitter of the inner ring and the wireless sensor of the outer ring. The signal repeater provides power.

The sensor data acquisition/output device can also be installed on the rolling element cage, and the energy harvesting coil and power management circuit for power supply are also installed on the cage, and the corresponding power generator permanent magnet array is installed on the inner ring of the bearing .

The sensor data acquisition/output device can also be installed on the outer ring of the bearing together with the wireless signal repeater, sharing a self-powered power supply.

The technical effect of the present invention is as follows:

1. The device of the present invention realizes self-powered collection and wireless transmission of sensor data inside the bearing. The whole device does not need to be powered by an external power source or battery. As long as the bearing is in working state, it can autonomously collect the state data inside the bearing. When the interrogator wirelessly queries, the sensor data can be transmitted wirelessly.

2. The present invention can collect the temperature, load, rotational speed, stress/strain, vibration and other parameters of the inner ring of the bearing, and obtain these parameter data through wireless query of the self-powered wireless signal repeater on it.

3. There is no physical connection between the device of the present invention and other external devices, and the sensor signal output link inside the bearing does not have any physical connection, nor does it need to be connected to a power supply or battery. The device of the invention is assembled together and fixed with the bearing parts. As long as the bearing works, the device can function.

Description of drawings

1 is a schematic structural diagram of the principle and structure of Embodiment 1 of the internal sensing data acquisition and wireless transmission device for a fully self-powered rolling bearing according to the present invention

Figure 2 is a block diagram of the sensor data acquisition/output device

Figure 3 is an impedance modulation circuit

Figure 4 is a circuit diagram of a wireless signal repeater

5 is a schematic cross-sectional view of Embodiment 1 of the fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device of the present invention, wherein (a) is a side cross-sectional view of the bearing, and (b) is a front cross-sectional view.

Detailed ways

Example 1

Please refer to FIG. 1 and FIG. 5. FIG. 1 is a schematic diagram of the principle structure of Embodiment 1 of the device for collecting and wireless transmission of sensing data inside a fully self-powered rolling bearing according to the present invention. Schematic diagram of the installation of the transmission device on the bearing in Embodiment 1. It can be seen from the figure that the present invention is a fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device. The bearing includes the bearing inner ring 1, the bearing rolling body 2, the rolling body The cage 3, the bearing outer ring 4, and the sensor data acquisition/output device 9 composed of the sensor and its conditioning circuit, the sensor data acquisition circuit and the sensor data output circuit, are composed of the energy acquisition coil 5, the electric energy generator 6 and the sensor data output circuit. A self-powered power supply and a wireless signal repeater 8 composed of a power management circuit 7;

The sensor data acquisition/output device 9 is fixed at the position of the bearing inner ring 1 that does not contact the bearing rolling body 2, and the wireless signal repeater 8 is installed on the bearing outer ring 4 that does not contact the bearing rolling body 2. Location;

Two permanent magnet arrays are respectively arranged on the two surfaces of the cage 3 of the rolling body facing the inner ring 1 and the outer ring 4 of the bearing to form an electric energy generator:

One magnetic pole of the permanent magnet array arranged on the surface of the bearing inner ring 1 is opposite to the energy harvesting coil 5-2 installed on the outside of the bearing inner ring 1, and the inner ring energy harvesting coil 5-2 is The output end is connected with the input end of the inner circle power management circuit 7, and the output end of the inner circle power management circuit 7 is connected with the power end of the sensor data acquisition/output device 9, which is the sensor The data acquisition/output device 9 is powered, and the energy of the inner ring self-power supply 7 is collected from the rotation of the bearing inner ring 1 relative to the rolling element cage 3;

A magnetic pole of the permanent magnet array arranged on the surface of the bearing outer ring 4 is opposite to the outer ring energy harvesting coil 5-1 installed on the inner side of the bearing outer ring 4, and the outer ring energy harvesting coil 5- The output end of 1 is connected with the input end of the outer ring power management circuit 7, and the output end of the outer ring power management circuit 7 is connected with the power end of the wireless signal repeater 8, which is the wireless signal The repeater 8 is powered, and the energy of the outer ring from the power supply 7 is collected from the rotation of the bearing outer ring 4 relative to the rolling element cage 3 .

The sensors are selected according to bearing monitoring needs, including temperature, load, rotational speed, stress/strain, and vibration sensors.

The structure of the sensor data acquisition/output device 9 is shown in FIG. 2 . Among them, the sensor is selected according to the bearing monitoring needs. The multi-channel analog/digital conversion circuit converts the sensor output into a digital signal, and the microprocessor controls the A/D conversion and encodes the converted digital signal to generate a sensor data encoded signal. The encoded signal also contains the sensor's identification code. The output end of the encoded signal is connected to the control end of the impedance modulation circuit, and the input end of the impedance modulation circuit is connected to the antenna 9-2 installed on the inner ring 1 of the bearing. The antenna 9-2 and the inner antenna 8-2 of the wireless signal repeater form a wireless link.

A typical circuit of the impedance modulation circuit is shown in Figure 3.

The circuit diagram of the wireless signal repeater is shown in Figure 4.

The wireless signal repeater 8 is composed of two circulators, two radio frequency amplifiers, an inner antenna 8-2 and an outer antenna 8-1, and the inner antenna 8-2 is connected to one end of the second circulator 8-4, The other two ends of the second circulator 8-4 are respectively connected to the input end of the first radio frequency amplifier 8-6 and the output end of the second radio frequency amplifier 8-5. The external antenna 8-1 and the first circulator 8 One end of -3 is connected, and the other two ends of the first circulator 8-3 are respectively connected to the output end of the first radio frequency amplifier 8-6 and the input end of the second radio frequency amplifier 8-5.

The circuit structure of the wireless signal repeater 8 is simple, the power consumption can be low, and it is powered by the self-powered power supply of the outer ring.

5 is a schematic view of the installation section of Embodiment 1 of the fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device of the present invention, (a) is a side sectional view, (a) is a front sectional view, the outer ring electric energy is generated 6-1, inner circle power generator 6-2, outer circle energy harvesting coil 5-1, inner circle energy harvesting coil 5-2, outer antenna 8-1, inner antenna 8-2, wireless signal repeater 8 . The installation of the sensor data acquisition/output device 9 and its antenna 9-2 is shown in FIG. 5 . The antenna 9 - 2 mounted on the inner ring 1 is one of the components of the sensor data acquisition/output device 9 . The outer ring power management circuit 7 and the inner ring power management circuit 7 are together with the wireless signal repeater 8 and the sensor data acquisition/output device 9 respectively. The inner ring energy harvesting coil 5-2 and the sensor data acquisition/output device 9 are placed in a position where the outer rolling elements 2 of the bearing inner ring 1 do not contact; the outer ring energy harvesting coil 5-1 is placed on the inner side of the bearing outer ring 4 to roll The position where body 2 does not touch. The inner ring electric energy generator 6-2 is installed at the position where the cage 3 does not contact the rolling body 2, and one of the magnetic poles is facing the inner circle energy harvesting coil 5-2; the outer circle electric energy generator 6-1 is installed on the cage 3. The position that does not contact the rolling body 2, one of the magnetic poles is facing the outer ring energy harvesting coil 5-1. The wireless signal repeater 8 is installed on the bearing outer ring 4, the inner antenna 8-2 in the wireless signal repeater 8 is placed on the inner side of the bearing outer ring 4, and the antenna in the sensor data acquisition/output device 9 9-2 forms a wireless link, and the outer antenna 8-1 in the wireless signal repeater 8 is placed on the outer surface of the bearing outer ring 4 to form a wireless link with the antenna of the signal interrogator. All components in the sensor data acquisition/output device 9 are placed on the outside of the bearing inner ring 1 .

Embodiment 2

The electric energy generator of this embodiment is constituted by an array of permanent magnets distributed at equal intervals and not in contact between the magnets.

Embodiment 3

The electric energy generator of this embodiment is constituted by a Halbach permanent magnet array.

Embodiment 4

The sensor data acquisition/output device 9 of this embodiment is arranged inside the outer ring of the bearing, only the outer ring electric energy generator 6-1 and the outer ring energy harvesting coil 5-1, the output end of the outer ring energy harvesting coil 5-1 is connected to The input terminal of the power management circuit 7 and the output terminal of the power management circuit 7 are simultaneously connected to the power terminals of the sensor data acquisition/output device 9 and the wireless signal repeater 8 .

Experiments show that the invention can realize self-powered collection and wireless transmission of sensor data inside the bearing. The whole device does not need to be powered by an external power source or battery. As long as the bearing is in working state, it can autonomously collect the state data inside the bearing. When the interrogator wirelessly queries, the sensor data can be transmitted wirelessly.

Claims (7)

1. A fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device, the bearing comprises a bearing inner ring (1), a bearing rolling element (2), a rolling element cage (3) and a bearing outer ring ( 4), characterized in that the device further comprises a sensor data acquisition/output device (9) composed of a sensor and its conditioning circuit, a sensor data acquisition circuit, and a sensor data output circuit, consisting of an energy harvesting coil (5), an electric energy A self-powered power supply composed of a generator (6) and a power management circuit (7), a wireless signal repeater (8); the sensory data acquisition/output device (9) is fixed on a different part of the bearing inner ring (1). the position of contacting the bearing rolling body (2), the wireless signal repeater (8) is installed at the position of the bearing outer ring (4) which does not contact the bearing rolling body (2); Two permanent magnet arrays are respectively arranged on the two surfaces of the cage (3) of the rolling element facing the bearing inner ring (1) and the bearing outer ring (4): The permanent magnet array facing the inner ring (1) of the bearing constitutes an inner ring electric energy generator (6-2), and one magnetic pole of the inner ring electric energy generator (6-2) is installed on the bearing inner ring (1). ) outside the inner ring energy harvesting coil (5-2), the inner ring electric energy generator (6-2) generates electrical output due to the movement of the bearing inner ring (1) in the inner ring energy harvesting coil (5-2), The output end of the inner circle energy harvesting coil (5-2) is connected with the input end of the inner circle power management circuit (7), and the output end of the inner circle power management circuit (7) is connected with the sensing data The power supply end of the collector/output device (9) is connected to supply power to the sensor data collector/output device (9), and the energy of the inner ring from the power supply is collected from the bearing inner ring (1) relative to the rolling body the rotation of the cage (3); The permanent magnet array facing the bearing outer ring (4) constitutes an outer ring electric energy generator (6-1), and one magnetic pole of the outer ring electric energy generator (6-1) is installed on the bearing outer ring (4) facing the bearing outer ring (4). ) inside the outer ring energy harvesting coil (5-1), the outer ring electric energy generator (6-1) works with the bearing to generate electrical output in the outer ring energy harvesting coil (5-1), the outer ring energy generator (6-1) The output end of the energy harvesting coil (5-1) is connected with the input end of the outer circle power management circuit (7), and the output end of the outer circle power management circuit (7) is connected with the wireless signal repeater (8) is connected to the power supply end to supply power to the wireless signal repeater (8), and the energy of the self-powered power supply of the outer ring is collected from the bearing outer ring (4) relative to the rolling element cage (3) rotation. 2. The fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device according to claim 1, characterized in that the sensors are selected according to different types of bearing fault monitoring needs, including temperature, load, rotational speed, strain, vibration sensors . 3. The fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device according to claim 1, wherein the wireless signal repeater (8) comprises an outer antenna (8-1) and an inner antenna (8). -2), the outer antenna (8-1) is arranged on the outer surface of the outer ring (4), and the inner antenna (8-2) is arranged on the inner side of the outer ring (4). 4. The fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device according to claim 1 is characterized in that the self-powered power supply has only one, and the electric energy generator (6) of the self-powered power supply is placed on the cage (6). 3), one of the magnetic poles faces the inner side of the outer ring (4), the energy harvesting coil (5) is installed on the inner side of the outer ring (4), and the output end of the energy harvesting coil (5) is connected to the input of the power management circuit (7) terminal, the output terminal of the power management circuit (7) is connected to the power supply terminal of the sensor data acquisition/output device (9) and the wireless signal repeater (8), the sensor data acquisition/output device (9) and the wireless signal The relays (8) are installed on the bearing outer ring (4). 5. The fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device according to claim 1, characterized in that the energy harvesting coil (5) is a magnetoelectric transducer. 6. The fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device according to claim 1, characterized in that the sensing signal output wireless link of the sensing data acquisition/output device (9) is connected by a sensor. The antenna (9-1) in the data acquisition/output device (9) and the inner antenna (8-2) of the wireless signal repeater (8) are formed, and the output end of the antenna (9-1) is connected to the sensor data acquisition/ The input end of the impedance modulation circuit in the output device (9) is connected, and the sensing code signal generated by the sensor data acquisition/output device (9) is connected to the control end of the impedance modulation circuit. 7. The fully self-powered rolling bearing internal sensing data acquisition and wireless transmission device according to claim 1, characterized in that the wireless signal repeater (8) consists of two circulators, two radio frequency amplifiers, an inner antenna (8-2) is formed with an outer antenna (8-1), the inner antenna (8-2) is connected to one end of the second circulator (8-4), and the other two ends of the second circulator (8-4) are respectively connected to the input end of the first radio frequency amplifier (8-6) and the output end of the second radio frequency amplifier (8-5), the outer antenna (8-1) and one end of the first circulator (8-3) connected, the other two ends of the first circulator (8-3) are respectively connected to the output end of the first radio frequency amplifier (8-6) and the input end of the second radio frequency amplifier (8-5).

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