Strain, vibration and temperature data measuring device for double-nut preloaded ball screw pair

Abstract

The present application provides a device for measuring strain, vibration and temperature data of a double-nut pre-tightened ball screw pair, the device comprising: a disc body and an energy supply module and a sensor module arranged in the disc body; a threaded hole is provided at the bottom of the disc body, a screw hole concentric with the disc body is provided at the bottom of the disc body, and a rectangular hole for the sensor module is provided at the bottom of the disc body; the length of the rectangular hole of the sensor module is perpendicular to the normal of the disc body; a circular ring groove is provided on the outer side of the disc body; two symmetrical fixing holes spaced 180 degrees apart are provided on the outer side of the disc body, and a plurality of rectangular grooves spaced 15 degrees apart from each other are provided on the top circular ring of the disc body; an energy supply module is provided on the inner bottom surface of the disc body, and the sensor module is powered by the energy supply module; the energy supply module generates electricity by itself by densely distributing a plurality of vibration power generation sheets symmetrically and circumferentially along the normal of the disc body, and the vibration power generation sheets are fixed in the rectangular grooves in the disc body. The present application saves the volume of the functional module.

Description

Technical Field

[0001] The present application relates to the field of self-powered micro-electromechanical systems, and in particular to a device for measuring strain, vibration, and temperature data of a double-nut pre-tightened ball screw pair. Background Art

[0002] Currently, strain, vibration, and temperature data for double-nut preloaded ball screws are primarily measured on large test benches. The actual operating conditions of double-nut preloaded ball screws differ significantly from the test bench environment, and these measurements are indirect and offline, making them inaccurate and inconvenient.

[0003] In the field of self-powered micro-electromechanical systems (MEMS) technology, existing self-generating devices occupy a large volume, and the vibration generators are often arranged axially, resulting in low power generation efficiency, low output, and unstable performance. These drawbacks result in performance data measured on large test benches that cannot accurately reflect the operation of double-nut preloaded ball screws. Existing self-generating technology is unsuitable for application in small, precise structures, making it difficult to guide the research, production, and operation of double-nut preloaded ball screws. Summary of the Invention

[0004] The present application provides a device for measuring strain, vibration and temperature data of a double-nut pre-tightened ball screw pair, which can be used to solve the technical problem that the existing self-generating technology is not suitable for application in small-volume precision structures and is difficult to study the double-nut pre-tightened ball screw pair.

[0005] The present application provides a device for measuring strain, vibration, and temperature data of a double-nut preloaded ball screw pair, the device comprising:

[0006] A disc body and an energy supply module and a sensor module disposed in the disc body;

[0007] The bottom of the disc body is provided with two groups of four threaded holes, which are symmetrical about the normal direction of the disc body and spaced 60 degrees apart within the groups. The bottom of the disc body is provided with a lead screw hole concentric with the disc body, and the bottom of the disc body is provided with a rectangular hole for the sensor module;

[0008] The length of the rectangular hole of the sensor module is perpendicular to the normal direction of the disk;

[0009] The inner side of the disc body is provided with an annular groove; the outer side of the disc body is provided with two symmetrical fixing holes spaced 180 degrees apart; the top ring of the disc body is provided with a plurality of rectangular grooves spaced 15 degrees apart and evenly arranged along the disc body; the disc body is fixed to the end face of the nut flange by screws passing through the threaded holes;

[0010] The inner bottom surface of the disc body is provided with an energy supply module, the sensor module is powered by the energy supply module, the sensor module passes through the rectangular hole of the sensor module, and is fixed to the flange end surface of the double-nut pre-tightening ball screw pair nut by hot melt adhesive;

[0011] The energy supply module generates electricity by itself by densely distributing a plurality of vibration power generation sheets symmetrically in the normal direction and circumferential direction of the disk body, and the vibration power generation sheets are fixed in rectangular grooves in the disk body.

[0012] Optionally, the energy supply module includes an LTC3331 chip, two input terminals and one output terminal;

[0013] The two input terminals are connected to the vibration generator and the lithium battery respectively. When the two inputs are connected to the energy supply module at the same time, the buck-boost regulator integrated in the LTC3331 chip compares the voltages of the two inputs.

[0014] When the voltage generated by the vibration power generation chip is lower than the voltage of the lithium battery, the buck-boost regulation switch of the LTC3331 chip is turned on, and the LTC3331 chip uses the lithium battery as the output end of the energy supply module to power the sensor module; when the voltage generated by the vibration power generation chip is higher than the voltage of the lithium battery, the buck-boost regulation switch of the LTC3331 chip is turned off, and the LTC3331 chip uses the vibration power generation chip as the output end of the energy supply module to power the sensor module.

[0015] Optionally, the energy supply module includes a supercapacitor, a large inductor, a linear regulator and an operational amplifier for power collection;

[0016] A supercapacitor and a large inductor are connected in parallel to the input end of the vibration power generation chip in the energy supply module, a linear regulator is connected in series to the input end of the vibration power generation chip in the energy supply module, and an operational amplifier is connected in series to the input end of the lithium battery in the energy supply module;

[0017] When the LTC3331 chip uses the lithium battery to power the sensor module, the LTC3331 chip cuts off the input from the vibration generator chip to the LTC3331 chip. At this time, the input of the vibration generator chip is diverted to the supercapacitor and large inductor through the parallel circuit to store the electricity generated by the vibration generator chip.

[0018] When the LTC3331 chip uses the vibration generator chip to power the sensor module, the LTC3331 chip cuts off the input of the lithium battery to the LTC3331 chip. At the same time, the LTC3331 chip diverts a small current generated by the vibration generator chip to charge the lithium battery and monitors the lithium battery voltage through the operational amplifier. When the lithium battery voltage is greater than or equal to the operational amplifier cutoff value, the operational amplifier is disconnected and the lithium battery stops charging. When the lithium battery voltage is less than the operational amplifier cutoff value, the operational amplifier is turned on and the lithium battery continues to charge.

[0019] The energy supply module uses a linear voltage regulator to adjust the output of the vibration power generation piece, and converts the voltage output generated by the vibration power generation piece into a stable and non-fluctuating standard voltage output.

[0020] The optional sensor module uploads the strain signal, vibration signal and temperature signal measured by the sensor to the gateway through the built-in wireless WiFi chip, forwards them to the host computer through the gateway, and displays the strain signal, vibration signal and temperature signal in numerical form on the host computer;

[0021] The operating current of the sensor module is 200mA, and the output voltage of the energy supply module is 5V.

[0022] Optionally, the annular groove has a diameter of 147 mm, a depth of 3 mm, and is 27 mm away from the bottom of the disc body. The cable is placed in the annular groove to electrically connect the vibration power generation sheet with the energy supply module and the sensor module.

[0023] This application fixes the measuring device on the nut end face of the ball screw pair, and can directly and online measure the performance data of the ball screw pair without the help of an external power supply and without affecting the normal operation of the ball screw pair. The measurement is convenient and the data is accurate, which reduces the workload of personnel and avoids the disadvantage of the ball screw pair needing to be shut down for inspection. The energy supply module uses a total of 19 vibration power generation plates that are symmetrical along the normal direction of the disk body and densely distributed circumferentially to generate self-generated electricity, making full use of the symmetrical structural characteristics of the ball screw pair and the characteristics of low-frequency vibration generated during operation. Combined with the power collection strategy, compared with the existing vibration power generation technology, it occupies a smaller volume, has higher working efficiency and more considerable output voltage. The energy supply module 8 adjusts the vibration power generation plate and lithium battery power supply, eliminating the step of frequent battery replacement and the disadvantages of cable entanglement and inconvenience caused by external power supply, making it safer and more convenient. There is a threaded hole at the bottom of the disk body, which is fixed to the end face of the nut flange with screws, without the need for additional design of installation tools and steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a disc provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the connection between the energy supply module and the sensor module provided in an embodiment of the present application.

[0026] In the figure: 1. Disc body; 2. Threaded hole; 3. Screw hole; 4. Rectangular hole for sensor module; 5. Circular groove; 6. Fixing hole; 7. Rectangular groove; 8. Energy supply module; 9. Sensor module; 10. Gateway; 11. Host computer. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0028] The following first introduces the embodiments of the present application with reference to the accompanying drawings.

[0029] This application provides a device for measuring strain, vibration, and temperature data of a double-nut preloaded ball screw pair, comprising:

[0030] A disc body 1 and an energy supply module 8 and a sensor module 9 disposed in the disc body 1;

[0031] There are two groups of four threaded holes 2 at the bottom of the disc body 1, which are symmetrical about the normal of the disc body and spaced 60 degrees apart within the group. There is a screw hole 3 concentric with the disc body at the bottom of the disc body 1 to facilitate the passage of the screw without affecting the operation of the ball screw pair.

[0032] A rectangular hole 4 for the sensor module is provided at the bottom of the disc body 1 .

[0033] The disc body 1 is manufactured by additive manufacturing, and the material used is resin.

[0034] The length of the rectangular hole 4 of the sensor module is perpendicular to the normal of the disk body, which facilitates the placement of the sensor module 9 and its adhesion to the flange end face of the ball screw pair nut.

[0035] The inner side of the disc 1 has an annular groove 5. The groove is 147 mm in diameter and 3 mm deep, and is 27 mm from the bottom of the disc 1. The cables are placed in the groove 5 to electrically connect the vibration generator to the energy supply module 8 and the sensor module 9.

[0036] The outer surface of the disc 1 is equipped with two symmetrical fixing holes 6 spaced 180 degrees apart to facilitate the subsequent installation of a dust cover. The top ring of the disc 1 is provided with multiple rectangular grooves 7 spaced 15 degrees apart and evenly spaced along the disc. In this embodiment, there are 19 rectangular grooves 7. The disc 1 is secured to the end face of the nut flange by screws passing through threaded holes 2.

[0037] An energy supply module 8 is provided on the inner bottom surface of the disc body 1. The sensor module 9 is powered by the energy supply module 8. The sensor module 9 passes through the sensor module rectangular hole 4 and is fixed to the flange end face of the double-nut pre-tightening ball screw pair nut by hot melt adhesive.

[0038] The energy supply module 8 generates electricity by itself by densely distributing multiple vibration power generation sheets symmetrically along the normal and circumferential directions of the disk body 1. The vibration power generation sheets are fixed in the rectangular grooves 7 in the disk body 1. In the embodiment of the present application, there are 19 vibration power generation sheets.

[0039] The energy supply module 8 includes an LTC3331 chip, two input terminals and one output terminal;

[0040] The LTC3331 chip supports up to three input ports connected simultaneously. The two input ports are connected to the vibration generator and the lithium battery respectively. When the two inputs are connected to the energy supply module 8 at the same time, the buck-boost regulator switch integrated in the LTC3331 chip compares the voltages of the two inputs.

[0041] When the voltage generated by the vibration power generation chip is lower than the lithium battery voltage, the buck-boost regulation switch of the LTC3331 chip is turned on, and the LTC3331 chip uses the lithium battery as the output end of the energy supply module 8 to power the sensor module 9; when the voltage generated by the vibration power generation chip is greater than the lithium battery voltage, the buck-boost regulation switch of the LTC3331 chip is turned off, and the LTC3331 chip uses the vibration power generation chip as the output end of the energy supply module 8 to power the sensor module 9.

[0042] The energy supply module 8 includes a supercapacitor, a large inductor, a linear regulator and an operational amplifier for power collection;

[0043] The supercapacitor and the large inductor are connected in parallel with the input end of the vibration power generation chip in the energy supply module 8, the linear regulator is connected in series with the input end of the vibration power generation chip in the energy supply module 8, and the operational amplifier is connected in series with the input end of the lithium battery in the energy supply module 8;

[0044] When the LTC3331 chip uses the lithium battery to power the sensor module 9, the LTC3331 chip cuts off the input of the vibration power generation chip to the LTC3331 chip. At this time, the input of the vibration power generation chip is diverted to the super capacitor and large inductor through the parallel circuit to store the electricity generated by the vibration power generation chip;

[0045] When the LTC3331 chip calls the vibration power generation chip to power the sensor module 9, the LTC3331 chip cuts off the input of the lithium battery to the LTC3331 chip. At the same time, the LTC3331 chip diverts a small current generated by the vibration power generation chip to charge the lithium battery, and monitors the voltage of the lithium battery through the operational amplifier. When the lithium battery voltage is greater than or equal to the cutoff value of the operational amplifier, the operational amplifier is disconnected and the lithium battery stops charging. When the lithium battery voltage is less than the cutoff value of the operational amplifier, the operational amplifier is turned on and the lithium battery continues to charge, thereby keeping the lithium battery voltage stable and using the lithium battery as a backup power supply.

[0046] The energy supply module 8 uses a linear voltage regulator to adjust the output of the vibration power generation chip, converting the large-fluctuation and irregular voltage output generated by the vibration power generation chip into a stable and non-fluctuating standard voltage output.

[0047] The sensor module 9 uploads the strain signal, vibration signal and temperature signal measured by the sensor to the gateway 10 through the built-in wireless WiFi chip, forwards it to the host computer 11 through the gateway 10, and displays the strain signal, vibration signal and temperature signal in numerical form on the host computer 11. Finally, the host computer 11 displays the strain signal, vibration signal and temperature signal in numerical form on the screen of the host computer 11.

[0048] The sensor module 9 operates at a current of 200mA, and the energy supply module 8 outputs a voltage of 5V. This 5V output voltage is safe and will not cause any electric shock. The sensor module 9 operates at a current of 200mA, and a 2000mAh lithium battery can independently power it for 10 hours. Combined with the energy supply module 8's output regulation of the vibration generator and the lithium battery, it can operate continuously without power outages.

[0049] When in use, first use screws to fix the disc body 1 on the flange end face of the double-nut pre-tightened ball screw pair through the threaded hole 2 at the bottom of the disc body 1, then stick the strain gauge integrated in the sensor module 9 to the gasket of the double-nut pre-tightened ball screw pair, then clear and calibrate the sensor module 9, and start running the ball screw pair after the ready command is issued.

[0050] The sensor module 9 is placed in the sensor module rectangular hole 4 at the bottom of the disc body 1 and fixed to the end face of the nut flange by hot melt adhesive. The measured strain signal, vibration signal and temperature signal are uploaded to the gateway 10 through the wireless WiFi chip, and the gateway 10 forwards them to the host computer 11. Finally, the host computer 11 displays the strain signal, vibration signal and temperature signal in numerical form on the screen of the host computer 11, so that the operator can clearly know the current performance status of the ball screw pair.

[0051] The ball screw pair operation data is detected by the sensor module 9, and there is no need to stop the ball screw pair for detection, which provides more stable and accurate data, reduces the workload of personnel, reduces the occurrence of disassembly and assembly of the ball screw pair, and improves the production efficiency and operation stability of the ball screw pair.

[0052] Energy supply module 8 generates its own power using 19 vibration generators densely distributed symmetrically along the normal and circumferential directions of the disc body 1. This results in a compact design, high efficiency, and a high output voltage. Energy supply module 8 manages power supply, adjusting the output of the vibration generators and the lithium battery, eliminating the complexity of cable power supply and the hassle of frequent lithium battery replacement, providing greater safety and convenience. The disc body 1 is secured with screws, eliminating the need to redesign installation tools and procedures.

[0053] This application fixes the measuring device on the nut end face of the ball screw pair, and can directly and online measure the performance data of the ball screw pair without the help of an external power supply and without affecting the normal operation of the ball screw pair. The measurement is convenient and the data is accurate, which reduces the workload of the personnel and avoids the disadvantage of the ball screw pair needing to be shut down for inspection. The energy supply module 8 uses a total of 19 vibration power generation plates that are symmetrical along the normal direction of the disk body 1 and densely distributed circumferentially to generate self-generated electricity, making full use of the symmetrical structural characteristics of the ball screw pair and the characteristics of low-frequency vibration generated during operation. Combined with the power collection strategy, compared with the existing vibration power generation technology, it occupies a smaller volume, has higher working efficiency, and has a more considerable output voltage. The energy supply module 8 adjusts the vibration power generation plate and lithium battery power supply, eliminating the step of frequent battery replacement and the disadvantages of cable entanglement and inconvenience caused by external power supply, making it safer and more convenient. A threaded hole 2 is opened at the bottom of the disk body 1, which is fixed to the end face of the nut flange with screws, without the need for additional design of installation tools and steps.

[0054] In this specification, the same or similar parts between the various embodiments can be referred to each other. In particular, for the service construction device and service loading device embodiments, since they are basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiment.

[0055] The above-described embodiments of the present application do not constitute a limitation on the scope of protection of the present application.

Claims

1. Double-nut preloaded ball screw pair strain, vibration and temperature data measuring device, characterized in that: The device comprises: A disc body (1), and an energy supply module (8) and a sensor module (9) disposed in the disc body (1); The bottom of the disc body (1) is provided with two groups of four threaded holes (2) that are symmetrical about the normal direction of the disc body and spaced 60 degrees apart within the groups; the bottom of the disc body (1) is provided with a lead screw hole (3) that is concentric with the disc body; and the bottom of the disc body (1) is provided with a rectangular hole (4) for a sensor module; The length of the rectangular hole (4) of the sensor module is perpendicular to the normal direction of the disk; The inner side of the disc body (1) is provided with a circular groove (5); the outer side of the disc body (1) is provided with two symmetrical fixing holes (6) spaced 180 degrees apart; the top circular ring of the disc body (1) is provided with a plurality of rectangular grooves (7) evenly arranged along the disc body and spaced 15 degrees apart from each other; the disc body (1) is fixed to the end face of the nut flange by screws passing through the threaded holes (2); The inner bottom surface of the disc body (1) is provided with an energy supply module (8), the sensor module (9) is powered by the energy supply module (8), and the sensor module (9) passes through the sensor module rectangular hole (4) and is fixed to the flange end surface of the double-nut pre-tightening ball screw pair nut by hot melt adhesive; The energy supply module (8) generates self-electricity by densely distributing a plurality of vibration power generation sheets symmetrically in the normal direction and symmetrically in the circumferential direction of the disk body (1), and the vibration power generation sheets are fixed in the rectangular grooves (7) in the disk body (1).

2. The device according to claim 1, characterized in that The energy supply module (8) includes an LTC3331 chip, two input terminals and one output terminal; The two input ends are connected to the vibration power generation chip and the lithium battery respectively; when the two inputs are connected to the energy supply module (8) at the same time, the buck-boost regulating switch integrated in the LTC3331 chip compares the voltages of the two inputs; When the voltage generated by the vibration power generation chip is lower than the voltage of the lithium battery, the buck-boost regulating switch of the LTC3331 chip is turned on, and the LTC3331 chip uses the lithium battery as the output end of the energy supply module (8) to supply power to the sensor module (9); when the voltage generated by the vibration power generation chip is higher than the voltage of the lithium battery, the buck-boost regulating switch of the LTC3331 chip is turned off, and the LTC3331 chip uses the vibration power generation chip as the output end of the energy supply module (8) to supply power to the sensor module (9).

3. The device according to claim 2, characterized in that The energy supply module (8) includes a super capacitor, a large inductor, a linear voltage regulator and an operational amplifier for power collection; A supercapacitor and a large inductor are connected in parallel to the input end of the vibration power generation sheet in the energy supply module (8), a linear voltage regulator is connected in series to the input end of the vibration power generation sheet in the energy supply module (8), and an operational amplifier is connected in series to the input end of the lithium battery in the energy supply module (8); When the LTC3331 chip uses the lithium battery to power the sensor module (9), the LTC3331 chip cuts off the input of the vibration power generation chip to the LTC3331 chip. At this time, the input of the vibration power generation chip is diverted to the super capacitor and the large inductor through the parallel circuit, and the electricity generated by the vibration power generation chip is stored; When the LTC3331 chip uses the vibration power generation chip to power the sensor module (9), the LTC3331 chip cuts off the input of the lithium battery to the LTC3331 chip. At the same time, the LTC3331 chip diverts a small current generated by the vibration power generation chip to charge the lithium battery, and monitors the voltage of the lithium battery through the operational amplifier; when the lithium battery voltage is greater than or equal to the operational amplifier cutoff value, the operational amplifier is disconnected and the lithium battery stops charging; when the lithium battery voltage is less than the operational amplifier cutoff value, the operational amplifier is turned on and the lithium battery continues charging; The energy supply module (8) uses a linear voltage stabilizer to adjust the output of the vibration power generation sheet, and converts the voltage output generated by the vibration power generation sheet into a stable and non-fluctuating standard voltage output.

4. The device according to claim 3, characterized in that The sensor module (9) uploads the strain signal, vibration signal and temperature signal measured by the sensor to the gateway (10) through the built-in wireless WiFi chip, forwards the signals to the host computer (11) through the gateway (10), and displays the strain signal, vibration signal and temperature signal in numerical form on the host computer (11); The operating current of the sensor module (9) is 200mA, and the output voltage of the energy supply module (8) is 5V.

5. The device according to claim 1, characterized in that The annular groove (5) has a diameter of 147 mm and a depth of 3 mm, and is 27 mm away from the bottom of the disc body (1). The cable is placed in the annular groove (5) to electrically connect the vibration power generation sheet with the energy supply module (8) and the sensor module (9).

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