A device and method for detecting speed uniformity of a transmission system

Abstract

The present invention discloses a detection device and method for the speed uniformity of a transmission system, comprising a sensing module, an acquisition module, a filtering module, a calculation module, a data transmission module and a display and control module connected in sequence, and the sensing module is installed at the end of the transmission shaft of the transmission system and is arranged concentrically with the transmission shaft. The present invention utilizes the sensing module to be installed on the transmission shaft of the transmission system, and the acquisition module is used to collect and transmit the signal while ensuring that the signal is not distorted, and then the collected data is filtered, and then the cycle time of the collected data is calculated, and it is converted into speed data, and cached, and sent to the display and control module through the data transmission module for display of the speed curve. While ensuring the real-time detection of the speed data, the speed change of the transmission system in a small time can also be observed, which is convenient for monitoring and adjusting the transmission system, and realizes the economical, efficient and high-precision detection of the speed uniformity of the transmission system.

Description

Technical Field

[0001] The present invention belongs to the technical field of speed measurement of transport equipment, and specifically relates to a device and method for detecting speed uniformity of a transmission system, which is mostly used in high-precision detection and measurement systems that require stable instantaneous speed of the transmission system. Background Art

[0002] In recent years, with the vigorous development of intelligent manufacturing, intelligent equipment and automated testing equipment are increasingly used in the manufacturing industry. As the cost pressure of the manufacturing industry increases and the manufacturing industry pays more and more attention to product quality, the trend of replacing manual labor with high-tech, high-precision, and highly automated equipment will become more and more obvious. For the production of the manufacturing industry, most production lines require assembly line production of transmission systems, and the corresponding production and testing equipment need to be completed on the assembly line.

[0003] As the requirements for product quality are getting higher and higher, the requirements for product testing equipment are also getting higher and higher, especially the requirements for its accuracy. For example, the appearance inspection requirements for mobile phone cover glass must reach micron-level accuracy, and the transmission smoothness of the transmission system of such testing equipment directly affects the accuracy of the testing system. Therefore, the detection of the uniformity of the speed of its transmission system is particularly important for whether the equipment can achieve the detection accuracy.

[0004] At present, there are several main defects in the detection of transmission system speed uniformity: 1. The detection speed is not instantaneous and has a lag; 2. The sampling resolution of the detection speed is too low; 3. It is impossible to detect multiple transmission shafts at the same time and compare the speed differences of multiple transmission shafts. Summary of the invention

[0005] In view of this, the present invention proposes a device and method for detecting the speed uniformity of a transmission system, which aims to achieve economical, efficient and high-precision detection of the speed uniformity of a transmission system through real-time detection of the speed uniformity of the transmission system, high-resolution acquisition, multi-channel simultaneous detection and real-time accurate display.

[0006] In one aspect, the present invention provides a device for detecting speed uniformity of a transmission system, comprising:

[0007] A sensor module for sensing the speed of the transmission shaft, the sensor module being mounted at the end of the transmission shaft of the transmission system and being arranged concentrically with the transmission shaft;

[0008] An acquisition module for acquiring sensor module signals and signal level conversion;

[0009] A filter module for filtering digital signals;

[0010] A computing module for performing edge processing, computation conversion and data buffering on digital quantity signals;

[0011] A data transmission module for transmitting the calculated speed data to the display control module for processing and display;

[0012] A display and control module for displaying speed data and presenting it as a speed curve;

[0013] The sensing module, the acquisition module, the filtering module, the calculation module, the data transmission module and the display and control module are connected in sequence.

[0014] As a further improvement, the sensor module adopts an incremental photoelectric rotary encoder, the number of pulses per revolution of which is greater than 5000 times and the pulse width deviation is ±0.002 degrees.

[0015] As a further improvement, the acquisition module includes a photoelectric-differential module and a differential-photoelectric module connected to each other, the photoelectric-differential module is connected to the sensing module, and the differential-photoelectric module is connected to the filtering module.

[0016] As a further improvement, the calculation module includes a rising edge detection unit, a falling edge detection unit, a counter, a delay unit, a latch, a calculation conversion unit and a cache unit. The rising edge detection unit and the falling edge detection unit are arranged in parallel and are respectively connected to the filtering module, the counter and the delay unit. The counter and the delay unit are arranged in parallel and are both connected to the latch. The calculation conversion unit is connected to the cache unit, and the cache unit is connected to the data transmission module.

[0017] As a further improvement, the transmission system speed uniformity detection device further includes a phase-locked loop, and the calculation module is driven by a high-frequency clock generated by the phase-locked loop.

[0018] As a further improvement, the cache unit is a double-cache ping-pong structure, including two cache queues, one of which is used for storage and the other is used for reading.

[0019] As a further improvement, the filtering module, the calculation module and the data transmission module are integrated into the same carrier.

[0020] As a further improvement, the detection device is used to detect multiple transmission shafts at the same time. The number of sensor modules, acquisition modules, filtering modules and computing modules is the same as the number of transmission shafts. A sensor module, acquisition module, filtering module and computing module are provided on the detection channel where each transmission shaft is located.

[0021] On the other hand, the present invention further provides a method for detecting the speed uniformity of a transmission system, using any of the above-mentioned detection devices for the speed uniformity of a transmission system for detection, comprising the following steps:

[0022] S1. Install the sensor module on the end of the transmission shaft of the transmission system to be tested;

[0023] S2, turn on the acquisition module, filtering module, calculation module, data transmission module and display and control module in sequence;

[0024] S3, start the transmission system to make it run;

[0025] S4, converting the collected running conditions of the transmission shaft into digital quantities through the collection module and transmitting them to the filtering module;

[0026] S5, performing high-frequency filtering on the received digital signal through a filtering module, and outputting the filtered digital signal;

[0027] S6, providing a calculation module to perform edge processing on the filtered digital signal, counting the edge change time period and latching it, converting it into speed data, and caching the speed data;

[0028] S7, transmitting the calculated speed data to the display and control module through the data transmission module;

[0029] S8. Display the received speed data in the form of a curve through the display and control module, and adjust the transmission system according to the speed curve, then return to step S3 to achieve real-time detection of speed uniformity.

[0030] As a further improvement, the curve displayed in step S8 includes the instantaneous speed, the maximum / minimum speed within a set time period, the average speed, and the fluctuation of the maximum / minimum speed percentage.

[0031] Compared with the traditional speed uniformity detection method, the present invention has the following advantages:

[0032] 1) High-speed acquisition module, parallel calculation module, real-time data transmission and data display can ensure the real-time detection of speed data and eliminate the impact of detection lag;

[0033] 2) High-resolution speed data sampling can reflect the instantaneous speed of the transmission system, so that the speed change of the transmission system in a small time can be observed, which can reach the microsecond level or even nanosecond level;

[0034] 3) Good parallel processing architecture, which is very easy to expand to multi-channel speed detection, and is convenient for analyzing the speed consistency and speed followability between multiple transmission shafts. It provides an excellent solution for the overall speed uniformity analysis of multi-axis transmission systems and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0036] Figure 1 It is a simplified structural diagram of a first embodiment of a device for detecting speed uniformity of a transmission system according to the present invention.

[0037] Figure 2 It is a simplified structural diagram of a second embodiment of a device for detecting speed uniformity of a transmission system according to the present invention.

[0038] Figure 3 It is the internal principle diagram of the computing module of the present invention.

[0039] Figure 4 It is a flow chart of an embodiment of a method for detecting speed uniformity of a transmission system of the present invention.

[0040] Description of reference numerals:

[0041] 1- Transmission shaft

[0042] 2-Sensor module

[0043] 3- Collection module

[0044] 4-Filter module

[0045] 5-Computing module

[0046] 6-Data transmission module

[0047] 7-Display and control module

[0048] 8-Embedded System Processor

[0049] 501-Phase-Locked Loop

[0050] 502-Rising edge detection unit

[0051] 503-Falling edge detection unit

[0052] 504-Counter

[0053] 505-Delay Unit

[0054] 506-Latch

[0055] 507-Calculation conversion unit

[0056] 508-First Cache Queue

[0057] 509-Second cache queue

[0058] 510-Cache Unit DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0060] It should be noted that, in the present invention, the terms "first" and "second" are mainly used to distinguish different components, but do not specifically limit the components.

[0061] Figure 1 This is a simplified structural diagram of a first embodiment of a device for detecting speed uniformity of a transmission system according to the present invention.

[0062] like Figure 1 As shown, a transmission system speed uniformity detection device includes a sensing module 2, a collection module 3, a filtering module 4, a calculation module 5, a data transmission module 6 and a display and control module 7 connected in sequence. Specifically:

[0063] The sensor module 2 is used for sensing the speed of the transmission shaft 1. It is installed at the end of the transmission shaft 1 of the transmission system and is arranged concentrically with the transmission shaft 1. Preferably, the sensor module 2 is implemented by an incremental photoelectric rotary encoder. The photoelectric rotary encoder can convert mechanical quantities such as angular displacement and angular velocity of the output shaft into corresponding electrical pulses and output them as digital quantities through photoelectric conversion. It should be noted that the number of pulses per revolution of the incremental photoelectric rotary encoder is greater than 5000 times, and the pulse width deviation is ±0.002 degrees.

[0064] The acquisition module 3 is used for the acquisition and signal level conversion of the sensor module 2 signal, including an interconnected photoelectric-differential module and a differential-photoelectric module, the photoelectric-differential module is connected to the sensor module 2, the differential-photoelectric module is connected to the filter module 4, the photoelectric-differential module and the differential-photoelectric module are both composed of a photoelectric isolation module and a differential conversion module. Through the above settings, the digital output of the encoder is connected to the photoelectric isolation module, the photoelectric isolation module outputs the digital quantity of the encoder after isolation of the electrical signal-optical signal and the optical signal-electrical signal, and then inputs it into the differential conversion module to convert the signal into a differential level mode, which can facilitate the reliability of the digital signal during long-distance transmission; at the receiving end, the differential level is first converted to a TTL level (transistor-transistor logic level), and then after photoelectric isolation, the final digital signal is obtained. In order to ensure that the signal is not distorted during the acquisition and transmission process and does not affect the speed detection, the above-mentioned photoelectric isolation module is preferably a high-speed photoelectric isolation module, and the differential conversion module is preferably a high-speed differential conversion module.

[0065] The filter module 4 is used for filtering digital signals. It should be noted that in order to ensure the real-time detection speed, the filter module 4 adopts a high-frequency digital filter with a small signal delay. At the same time, in order to ensure the correctness of the digital signal, it is necessary to filter out the high-frequency interference and burrs of the input signal to reflect the rationality of the detection speed. Here, the filter module 4 adopts a digital filter instead of an analog filter. There are two main factors: first, the analog filter will change the shape of the signal input waveform, causing the collected digital signal to be distorted, thereby affecting the speed detection; second, the analog filter cannot easily adjust the filter frequency, which is not convenient for measuring different speeds. Preferably, the filter module 4 in the present invention can use a limiting and de-jittering digital filter.

[0066] The calculation module 5 is used to process the digital signal, calculate the conversion and cache the data. Figure 3 As shown, the calculation module 5 includes a rising edge detection unit 502, a falling edge detection unit 503, a counter 504, a delay unit 505, a latch 506, a calculation conversion unit 507 and a cache unit 510. The rising edge detection unit 502 and the falling edge detection unit 503 are arranged in parallel and are respectively connected to the filter module 4, the counter 504 and the delay unit 505. The counter 504 and the delay unit 505 are arranged in parallel and are both connected to the latch 506. The calculation conversion unit 507 is connected to the cache unit 510, and the cache unit 510 is connected to the data transmission module 6. The calculation module 5 adopts a parallel structure of a pipeline, which ensures the real-time performance of data processing and provides a good expansion structure for multi-channel detection.

[0067] It should be noted that the aforementioned rising edge detection unit 502 is used to detect the rising edge change of the coded pulse digital quantity signal; the falling edge detection unit 503 is used to detect the falling edge change of the coded pulse digital quantity signal; the counter 504 is used to count the time period count of the rising edge-falling edge and the falling edge-rising edge. When counting the time period of the rising edge-falling edge, the rising edge controls the start of the count and the falling edge controls the stop of the count. After the falling edge passes through the delay unit 505, the value of the counter 504 is latched in the latch 506. At the same time, the value in the counter 504 is cleared, and the falling edge-rising edge time period calculation is started. This cycle count is controlled by the falling edge. At the beginning, the counting is stopped by the rising edge control, and after the rising edge passes through the delay unit 505, the value of the counter 504 is latched in the latch 506, and then the rising edge-falling edge time period counting is repeated; the calculation conversion unit 507 calculates and converts the count value latched by the latch 506, because the pulse interval of the same encoder represents a fixed angular displacement, and the rotation displacement corresponding to the angular displacement of an encoded pulse can be obtained according to the transmission shaft 1 of different radii. After counting the time period of the pulse, the speed data can be calculated by the calculation conversion unit 507; the cache unit 510 caches the calculated speed data and then uses it for data transmission. At the same time, in order to ensure the real-time and high resolution of the speed calculation, the calculation module 5 of the present invention needs to be driven by a high-frequency clock, and preferably a high-frequency driving clock is produced by a phase-locked loop 501. Under the drive of the high-frequency clock, the accuracy of detecting changes by the rising edge detection unit 502 and the falling edge detection unit 503 can reach nanoseconds.

[0068] The data transmission module 6 is used to transmit the calculated speed data to the display and control module 7 for processing and display; preferably, the transmission mode of industrial Ethernet can be selected.

[0069] The display and control module 7 is used to display the speed data and display it as a speed curve. Furthermore, the display module can display the real-time speed curve, as well as the maximum speed, minimum speed, average speed, and maximum / minimum speed percentage fluctuations within a set time period through a human-computer interaction interface, so as to judge whether the uniformity of the speed meets the requirements. It should be noted that the display and control module 7 can be a computer and a liquid crystal display, but is not limited thereto.

[0070] In a further technical solution, the cache unit 510 in the present invention preferably adopts a double-cache ping-pong structure, such as Figure 3 As shown, it includes a first cache queue 508 and a second cache queue 509. When the first cache queue 508 is used for storage, the second cache queue 509 is used for reading. When the first cache queue 508 is used for reading, the second cache queue 509 is used for storage. The two are performed alternately to ensure continuous storage and transmission of speed data.

[0071] Meanwhile, as a further preferred embodiment, the filter module 4, the calculation module 5 and the data transmission module 6 in the present invention are integrated into the same carrier. It should be noted that the carrier can be an embedded system processor 8 based on FPGA, but is not limited thereto.

[0072] In addition, it is worth mentioning that the present invention can be expanded to detect multiple transmission shafts 1 at the same time based on the detection of a single transmission shaft 1 of the transmission system. Figure 2 This is a simplified structural diagram of Embodiment 2 of a detection device for speed uniformity of a transmission system of the present invention. The only difference between Embodiment 2 and Embodiment 1 is that Embodiment 1 is used for detection of a single transmission shaft 1, while Embodiment 2 is used for detection of multiple transmission shafts 1. In this Embodiment 2, the detection device is used to detect multiple transmission shafts 1 at the same time. The number of sensor modules 2, acquisition modules 3, filter modules 4 and calculation modules 5 is the same as the number of transmission shafts 1. The detection channel where each transmission shaft 1 is located is provided with a sensor module 2, acquisition module 3, filter module 4 and calculation module 5. As in Embodiment 1, the sensor module 2 is installed at the end of the transmission shaft 1 of the transmission system and is concentrically arranged with the transmission shaft 1. The sensor module 2, acquisition module 3, filter module 4, calculation module 5, data transmission module 6 and display and control module 7 are connected in sequence. The data on the detection channel where each transmission shaft 1 is located is sent to the display and control module 7 by the data transmission module 6, and the display and control module 7 then displays the data of all channels at the same time.

[0073] The transmission system speed uniformity detection device provided by the present invention utilizes a sensor module 2 installed on a transmission shaft 1 of the transmission system, and through an acquisition module 3, collects and transmits signals while ensuring that the signals are not distorted, and then filters the collected data, and then calculates the cycle time of the collected data, converts it into speed data, and caches it, and sends it to a display and control module 7 through a data transmission module 6 for display of a speed curve. While ensuring the real-time detection of speed data, the speed change of the transmission system in a small time period can also be observed, which is convenient for monitoring and adjusting the transmission system. Compared with the prior art, an economical, efficient and high-precision detection of the speed uniformity of the transmission system is achieved.

[0074] like Figure 4 As shown, the present invention also provides a method for detecting the speed uniformity of a transmission system, using the above-mentioned detection device for the speed uniformity of the transmission system for detection, comprising the following steps:

[0075] S1, installing the sensor module 2 at the end of the transmission shaft 1 of the transmission system to be tested;

[0076] S2, turn on the acquisition module 3, the filtering module 4, the calculation module 5, the data transmission module 6 and the display and control module 7 in sequence;

[0077] S3, start the transmission system to make it run;

[0078] S4, the operation status of the transmission shaft 1 collected by the collection module 3 is converted into a digital quantity and transmitted to the filtering module 4;

[0079] S5, performing high-frequency filtering on the received digital signal through the filtering module 4, and outputting the filtered digital signal;

[0080] S6, providing a calculation module 5 to perform edge processing on the filtered digital signal, counting the edge change time period and latching it, converting it into speed data, and caching the speed data;

[0081] S7, transmitting the calculated speed data to the display and control module 7 through the data transmission module 6;

[0082] S8, displaying the received speed data in the form of a curve through the display and control module 7, and adjusting the transmission system according to the speed curve, returning to step S3 to achieve real-time detection of speed uniformity. Preferably, the curve displayed in this step includes the instantaneous speed, the maximum / minimum speed within a set time period, the average speed, and the fluctuation of the maximum / minimum speed percentage.

[0083] This detection method obviously has the technical effect that the aforementioned detection device can realize economical, efficient and high-precision detection of the speed uniformity of the transmission system, and will not be elaborated here.

[0084] In summary, compared with the traditional speed uniformity detection method, the present invention has the following advantages:

[0085] 1) High-speed acquisition module 3, parallel calculation module 5, real-time data transmission and data display can ensure the real-time detection of speed data and eliminate the impact of detection lag;

[0086] 2) High-resolution speed data sampling can reflect the instantaneous speed of the transmission system, so that the speed change of the transmission system in a small time can be observed, which can reach the microsecond level or even nanosecond level;

[0087] 3) Good parallel processing architecture, which is very easy to expand to multiple channels of speed detection, and is convenient for analyzing the speed consistency and speed followability among multiple transmission shafts 1. It provides an excellent solution for the overall speed uniformity analysis of multi-axis transmission systems, and has a wide range of applications.

[0088] Many specific details are set forth in the above description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein, and therefore, they should not be construed as limiting the scope of protection of the present invention.

[0089] In summary, although the present invention lists the above-mentioned preferred embodiments, it should be noted that although technicians in this field can make various changes and modifications, unless such changes and modifications deviate from the scope of the present invention, they should be included in the protection scope of the present invention.

Claims

1. A device for detecting speed uniformity of a transmission system, characterized in that: include: A sensor module for sensing the speed of the transmission shaft, wherein the sensor module is mounted at the end of the transmission shaft of the transmission system and is arranged concentrically with the transmission shaft; An acquisition module for acquiring sensor module signals and signal level conversion; A filter module for filtering digital signals; A computing module for performing edge processing, computation conversion and data buffering on digital quantity signals; A data transmission module for transmitting the calculated speed data to the display control module for processing and display; A display and control module for displaying speed data and presenting it as a speed curve; The sensing module, acquisition module, filtering module, calculation module, data transmission module and display and control module are connected in sequence; The acquisition module includes an optoelectronic-differential module and a differential-optoelectronic module connected to each other, the optoelectronic-differential module is connected to the sensing module, and the differential-optoelectronic module is connected to the filtering module; The calculation module includes a rising edge detection unit, a falling edge detection unit, a counter, a delay unit, a latch, a calculation conversion unit and a cache unit. The rising edge detection unit and the falling edge detection unit are arranged in parallel and are respectively connected to the filtering module, the counter and the delay unit. The counter and the delay unit are arranged in parallel and are both connected to the latch. The calculation conversion unit is connected to the cache unit, and the cache unit is connected to the data transmission module.

2. The transmission system speed uniformity detection device according to claim 1, characterized in that: The sensor module adopts an incremental photoelectric rotary encoder, the number of pulses per revolution of which is greater than 5000 times, and the pulse width deviation is ±0.002 degrees.

3. The transmission system speed uniformity detection device according to claim 1, characterized in that: A phase-locked loop is also included, and the computing module is driven by a high-frequency clock generated by the phase-locked loop.

4. The device for detecting speed uniformity of a transmission system according to any one of claims 1 to 3, characterized in that: The cache unit is a double-cache ping-pong structure, including two cache queues, one of which is used for storage and the other is used for reading.

5. The transmission system speed uniformity detection device according to claim 4, characterized in that: The filtering module, the computing module and the data transmission module are integrated into the same carrier.

6. The transmission system speed uniformity detection device according to claim 5, characterized in that: The detection device is used to detect multiple transmission shafts at the same time. The number of sensor modules, acquisition modules, filter modules and calculation modules is the same as the number of transmission shafts. A sensor module, acquisition module, filter module and calculation module are provided on the detection channel where each transmission shaft is located.

7. A method for detecting speed uniformity of a transmission system, characterized in that: The detection device for detecting the speed uniformity of the transmission system according to any one of claims 1 to 6 is used for detection, comprising the following steps: S1. Install the sensor module on the end of the transmission shaft of the transmission system to be tested; S2, turn on the acquisition module, filtering module, calculation module, data transmission module and display and control module in sequence; S3, start the transmission system to make it run; S4, converting the collected running conditions of the transmission shaft into digital quantities through the collection module and transmitting them to the filtering module; S5, performing high-frequency filtering on the received digital signal through a filtering module, and outputting the filtered digital signal; S6, providing a calculation module to perform edge processing on the filtered digital signal, counting the edge change time period and latching it, converting it into speed data, and caching the speed data; S7, transmitting the calculated speed data to the display and control module through the data transmission module; S8. Display the received speed data in the form of a curve through the display and control module, and adjust the transmission system according to the speed curve, then return to step S3 to achieve real-time detection of speed uniformity.

8. The method for detecting speed uniformity of a transmission system according to claim 7, characterized in that: The curve displayed in step S8 includes the instantaneous speed, the maximum / minimum speed within a set time period, the average speed, and the fluctuation of the maximum / minimum speed percentage.

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