Steering wheel rivet height automatic detection device and detection method

Abstract

The invention discloses a steering wheel rivet height automatic detection device and method, the device comprises a box body, a digital display dial indicator, a concentrator, a PLC controller and a touch screen all-in-one machine, one side of the top of the box body is provided with a detection tool platform, and the surface of the detection tool platform is provided with a positioning groove matched with the rim of a steering wheel to be detected; the top of the detection tool platform is further vertically and fixedly connected with a supporting column, the top of the supporting column is horizontally and fixedly connected with a limiting plate, the top of the limiting plate is fixedly connected with a positioning column matched with a steering wheel skeleton bottom cover to be detected, and the bottom of the limiting plate is connected with a digital display dial indicator through a fixing support. The invention relates to the technical field of automobile part detection. According to the steering wheel rivet height automatic detection device and detection method, the problems of low efficiency and easy misjudgment caused by dependence on manual detection in the prior art are solved, and rapid, accurate and automatic rivet height detection is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile part detection, in particular to a steering wheel rivet height automatic detection device and detection method. BACKGROUND

[0002] In the production and assembly process of automobile steering wheel, the installation height of rivet directly affects the assembly accuracy and safety of steering wheel, so it is necessary to strictly detect the rivet height. In the prior art, the detection of steering wheel rivet height mainly relies on manual operation: the operator judges whether the rivet height is qualified by observing the pointer position of the mechanical meter. This method has obvious defects: first, the mechanical meter pointer reading is easily affected by the visual angle and the fatigue degree of the operator, and the out-of-tolerance condition is difficult to accurately identify, which leads to unqualified products flowing into the next production link; in addition, the manual detection of each rivet reading is tedious and time-consuming, and the detection efficiency is low; finally, the mechanical meter pointer may have multiple rotations, which may cause reading errors and further reduce the detection accuracy.

[0003] To solve the problem of data transmission and interaction, Modbus RTU communication protocol is widely used as a general communication standard for electronic controllers. Through clear address coding, data frame format and error detection mechanism, it realizes stable communication between the controller and external devices. Based on the shortcomings of the existing detection technology and the application of the communication protocol, an automatic detection device and method need to be designed to realize fast and accurate detection of steering wheel rivet height and real-time alarm of defective products, and to solve the detection error problem caused by the improper installation of the steering wheel during the detection process. SUMMARY

[0004] (I) Technical problems to be solved In view of the shortcomings of the prior art, the present application provides a steering wheel rivet height automatic detection device and detection method, which solves the problems of low efficiency and easy misjudgment caused by manual detection in the prior art, and realizes fast, accurate and automatic rivet height detection.

[0005] (II) Technical solutions To achieve the above objectives, the present invention provides the following technical solution: an automatic steering wheel rivet height detection device, comprising a housing, a digital micrometer, a hub, a PLC controller, and a touch screen all-in-one unit. A detection fixture platform is provided on one side of the top of the housing. The surface of the detection fixture platform is provided with a positioning groove adapted to the rim of the steering wheel to be tested. Position switches are symmetrically arranged within the positioning groove. A support column is vertically fixedly connected to the top of the detection fixture platform. A limit plate is horizontally fixedly connected to the top of the support column. A positioning column adapted to the bottom cover of the steering wheel frame to be tested is fixedly connected to the top of the limit plate. The bottom cover of the steering wheel frame is connected to the steering wheel rim via spokes. The bottom of the limit plate is fixedly connected to... The device has a fixed bracket, and the digital micrometer is detachably fixed inside the bracket by screws. The probe of the digital micrometer extends above the limit plate and is vertically aligned with the rivet detection point of the steering wheel. The hub and PLC controller are housed inside the enclosure. The digital micrometer is connected to the input terminal of the hub via a communication cable. The touch screen all-in-one machine is fixed to the top side of the enclosure by a mounting bracket. The PLC controller is electrically connected to the touch screen all-in-one machine. The output terminal of the PLC controller is connected to the hub via a communication cable. The position switch is electrically connected to the PLC controller. An alarm indicator light is also provided on the top side of the enclosure, and the alarm indicator light is electrically connected to the control terminal of the PLC controller.

[0006] The PLC controller 11 is equipped with STEP 7-Micro / WIN SMART programming software for data processing, communication control, and alarm control program execution. The touch screen all-in-one machine 12 is equipped with MCGSPro embedded configuration software for parameter setting, data display, and operation command input. Preferably, the enclosure also contains a power module, and the surface of the enclosure is provided with a control switch. The output terminal of the power module is electrically connected to a position switch, a digital micrometer, a hub, a PLC controller, and a touch screen all-in-one machine through the control switch.

[0007] Preferably, the position switch is a proximity switch or a micro switch.

[0008] Preferably, four fixed brackets are provided and distributed on both sides of the bottom of the limiting plate, and the hub is a four-way hub.

[0009] Preferably, the bottom of the housing is provided with casters, and the casters have a locking function.

[0010] Preferably, the hub communicates with the PLC controller via a 485 communication line using the Modbus RTU protocol. The communication parameters of this protocol are: baud rate 38400bps, 1 start bit, 8 data bits, and 2 stop bits.

[0011] Preferably, the limiting plate is fixedly connected to the top of the support column by bolts, and the limiting plate is provided with various specifications to adapt to different steering wheel sizes.

[0012] An automatic method for detecting the height of steering wheel rivets includes the following steps: S1: System initialization and parameter setting: Set the acceptable tolerance range for rivet height using the touch screen all-in-one machine; S2: Calibration step: Place the standard block in the positioning slot of the testing fixture platform and make it contact the positioning column to trigger the position switch; after receiving the position signal from the position switch, the PLC controller collects the readings of each digital micrometer at this time through the hub and sets the reading as the reference value. S3: Product Placement and Position Judgment Steps: Place the steering wheel to be tested on the testing fixture platform, so that its wheel rim is embedded in the positioning groove, and the frame bottom cover is fitted onto the positioning post; when the position switch is triggered and sends a position signal to the PLC controller, it is determined that the steering wheel is installed in place, and the next step is executed; if no position signal is received, an installation abnormality is indicated through the touch screen all-in-one machine; S4: Data acquisition step: After the PLC controller confirms that the steering wheel is in place, it acquires the real-time measurement data of each digital micrometer on the corresponding rivet through the hub. S5: Data processing and judgment steps: The PLC controller processes the collected measurement data, calculates the actual height value of each rivet, and compares the actual height value with the preset acceptable tolerance range; S6: Result Output Steps: If the actual height values ​​of all rivets are within the acceptable tolerance range, the product is deemed qualified, and the qualified information is displayed on the touch screen all-in-one machine; if the actual height value of any rivet exceeds the acceptable tolerance range, the product is deemed unqualified, and the PLC controller controls the alarm indicator to issue an alarm signal.

[0013] Preferably, in the data acquisition step S4, the PLC controller and the hub communicate using the Modbus RTU protocol; the PLC controller sends a query command frame containing the slave address and function code to the hub, and the hub responds and returns a data frame containing multiple digital micrometer measurement data.

[0014] Preferably, in the data processing and judgment step S5, the data frame is subjected to CRC verification to ensure data integrity; after the verification is passed, the hexadecimal measurement data in the data frame is parsed and converted into the actual height value in decimal.

[0015] (III) Beneficial Effects This invention provides an automatic detection device and method for steering wheel rivet height. It has the following beneficial effects: (1) To achieve automated testing, there is no need for manual reading of mechanical dial indicators. Through the collaboration of digital display dial indicators, PLC controllers and communication modules, data acquisition, processing and comparison can be completed quickly, which greatly shortens the testing time and improves production efficiency. (2) Add a position switch to ensure that the test is started only after the steering wheel is installed in place, so as to avoid the test error caused by the placement offset. Combined with the standard block calibration procedure, the test accuracy is further improved, and the out-of-tolerance products are effectively prevented from flowing into the next production stage. (3) The sound and light alarm module with buzzer is adopted. Defective products can trigger an alarm in real time. Combined with the visual display of the touch screen, it is easy for operators to quickly identify unqualified products and reduce the risk of missed inspection caused by visual fatigue. The limit plate adopts a detachable structure and supports the replacement of different specifications to adapt to various steering wheels. The bottom of the box is equipped with universal wheels with locking function, which makes it easy to move and fix, and improves the versatility and flexibility of the equipment. Attached Figure Description

[0016] Fig. 1 This is a schematic diagram of the overall structure of the present invention; Fig. 2 This is a schematic diagram of the internal structure of the housing of the present invention; Fig. 3 This is a top view of the limiting plate of the present invention.

[0017] In the diagram: 1-Box; 2-Inspection tooling platform; 3-Positioning slot; 4-Position switch; 5-Support column; 6-Limit plate; 7-Positioning column; 8-Fixed bracket; 9-Digital display dial indicator; 10-Hub; 11-PLC controller; 12-Touch screen all-in-one machine; 13-Mounting bracket; 14-Alarm indicator light; 15-Power module; 16-Control switch; 17-Universal caster wheel. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figs. 1-3This invention provides a technical solution: an automatic steering wheel rivet height detection device, comprising a housing 1, a digital micrometer 9, a hub 10, a PLC controller 11, and a touch screen all-in-one machine 12. A detection fixture platform 2 is provided on the top side of the housing 1. The surface of the detection fixture platform 2 is provided with a positioning groove 3 adapted to the rim of the steering wheel to be tested. Position switches 4 are symmetrically arranged in the positioning groove 3. The position switches 4 are proximity switches or micro switches. The positioning groove 3 is provided with an installation groove adapted to the position switches 4. When the steering wheel rim is in complete contact with the surface of the positioning groove 3, the position switches 4 are turned on. A support column 5 is also vertically fixedly connected to the top of the detection fixture platform 2. A limit plate 6 is horizontally fixedly connected to the top of the support column 5. A positioning column 7 adapted to the bottom cover of the steering wheel frame to be tested is fixedly connected to the top of the limit plate 6. The limit plate 6 and the top of the support column 5 are fixedly connected by bolts 18. By replacing the limit plate 6 with different thicknesses and the positioning column 7 with different specifications, the device can adapt to different specifications of steering wheels.

[0020] The bottom of the limit plate 6 is fixedly connected to a fixed bracket 8. The digital micrometer 9 is detachably fixed in the fixed bracket 8 by a screw. The steering wheel is usually equipped with four rivets, so there are four fixed brackets 8, which are distributed on both sides of the bottom of the limit plate 6. The hub 10 is a four-way hub.

[0021] The probe of the digital micrometer 9 extends above the limit plate 6 and is vertically aligned with the rivet detection point of the steering wheel. The hub 10 and the PLC controller 11 are installed inside the housing 1. The digital micrometer 9 is connected to the input terminal of the hub 10 via a communication cable. The touch screen all-in-one machine 12 is fixed to the top side of the housing 1 via the mounting bracket 13. The PLC controller 11 is electrically connected to the touch screen all-in-one machine 12. The output terminal of the PLC controller 11 is connected to the hub 10 via a communication cable. The position switch 4 is electrically connected to the PLC controller 11. An alarm indicator light 14 is also provided on the top side of the housing 1. The alarm indicator light 14 is electrically connected to the control terminal of the PLC controller 11.

[0022] The enclosure 1 is also equipped with a power module 15. The surface of the enclosure 1 is equipped with a control switch 16. The output terminal of the power module 15 is electrically connected to the position switch 4, the digital micrometer 9, the hub 10, the PLC controller 11 and the touch screen all-in-one machine 12 through the control switch 16 to supply power to each module.

[0023] The bottom of the housing 1 is equipped with casters 17, which have a locking function for easy movement and fixation.

[0024] The hub 10 and the PLC controller 11 communicate via a 485 communication line using the Modbus RTU protocol.

[0025] An automatic method for detecting the height of steering wheel rivets includes the following steps: S1: System initialization and parameter setting: Set the acceptable tolerance range for rivet height through the touch screen all-in-one machine 12; S2: Calibration steps: Place the standard block in the positioning slot 3 of the testing fixture platform 2 and make it contact the positioning column 7 to trigger the position switch 4; After receiving the position signal from the position switch 4, the PLC controller 11 collects the readings of each digital display dial indicator 9 at this time through the hub 10 and sets the reading as the reference value. S3: Product placement and positioning judgment steps: Place the steering wheel to be tested on the testing fixture platform 2, so that its wheel rim is embedded in the positioning groove 3, and the frame bottom cover is fitted onto the positioning post 7; when the position switch 4 is triggered and sends a positioning signal to the PLC controller 11, it is determined that the steering wheel is installed in place, and the next step is executed; if no positioning signal is received, the installation abnormality is indicated through the touch screen all-in-one machine 12. S4: Data acquisition steps: After the PLC controller 11 confirms that the steering wheel is in place, it collects the real-time measurement data of each digital display dial indicator 9 for the corresponding rivets through the hub 10. S5: Data processing and judgment steps: The PLC controller 11 processes the collected measurement data, calculates the actual height value of each rivet, and compares the actual height value with the preset acceptable tolerance range; S6: Result Output Steps: If the actual height values ​​of all rivets are within the acceptable tolerance range, the product is deemed qualified and the qualified information is displayed on the touch screen all-in-one machine 12; if the actual height value of any rivet exceeds the acceptable tolerance range, the product is deemed unqualified and the PLC controller 11 controls the alarm indicator 14 to issue an alarm signal.

[0026] In the data acquisition step S4, the PLC controller 11 and the hub 10 communicate using the Modbus RTU protocol; the PLC controller 11 sends a query command frame containing the slave address and function code to the hub 10, and the hub 10 responds and returns a data frame containing measurement data from multiple digital micrometers 9.

[0027] In the data processing and judgment step S5, the data frame is subjected to CRC check to ensure data integrity; after the check passes, the hexadecimal measurement data in the data frame is parsed and converted into decimal data in the manner of "multiplying the high byte data by 256 and then adding the low byte data", and the positive or negative value is determined by the first byte of the original data.

[0028] The digital micrometer 9 is a high-precision digital micrometer from the Shivaka brand, with a measurement accuracy of 0.001mm; the PLC controller 11 is a Siemens S7-200 SMART series; the hub 10 is a PK-10AR-S model four-channel hub with an initial factory address code of 80H, corresponding to decimal 128, and supports modification of the address code, baud rate, and parity parameters via instructions; a solid green light on the alarm indicator 14 indicates a qualified test, while a flashing red light combined with a buzzer sound indicates a failed test.

[0029] The data acquisition and conversion process is as follows: The PLC controller 11 sends a hexadecimal query command frame “80 03 00 00 00 08 5A 1D” to the hub 10. After the hub 10 responds, it returns a 21-byte data frame, in which the specified field is the measurement data of four digital micrometers 9. The measurement data of each digital micrometer 9 occupies 4 bytes. The first byte is the sign bit, and the third and fourth bytes are the hexadecimal measurement data. For example, if the measurement data of a certain digital micrometer 9 is “01 00 1235” (hexadecimal), then the high byte 12H (decimal 18) multiplied by 256 and the low byte 35H (decimal 53) are added to obtain the decimal data 4661. Since the sign bit is 01H (not zero), the actual height is -4.661mm.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steering wheel rivet height automatic detection device, comprising a box body (1), a digital dial gauge (9), a concentrator (10), a PLC controller (11) and a touch screen all-in-one machine (12), characterized in that: The top side of the box (1) is provided with a detection tool platform (2), the surface of the detection tool platform (2) is provided with a positioning groove (3) matched with the steering wheel rim to be detected, the positioning groove (3) is symmetrically provided with a position switch (4) inside, the top of the detection tool platform (2) is also vertically fixedly connected with a supporting column (5), the top of the supporting column (5) is horizontally fixedly connected with a limiting plate (6), the top of the limiting plate (6) is fixedly connected with a positioning column (7) matched with the steering wheel skeleton bottom cover to be detected, the bottom of the limiting plate (6) is fixedly connected with a fixed support (8), the digital dial gauge (9) is detachably fixed in the fixed support (8) through a screw rod, the measuring head of the digital dial gauge (9) extends above the limiting plate (6) and is vertically aligned with the rivet detection point of the steering wheel, the concentrator (10) and the PLC controller (11) are arranged in the box (1), the digital dial gauge (9) is connected with the input end of the concentrator (10) through a communication line, the touch screen all-in-one machine (12) is fixed on the top side of the box (1) through a mounting bracket (13), the PLC controller (11) is electrically connected with the touch screen all-in-one machine (12), the PLC controller (11) is connected with the output end of the concentrator (10) through a communication line, the position switch (4) is electrically connected with the PLC controller (11), and the top side of the box (1) is also provided with an alarm indicator lamp (14), the alarm indicator lamp (14) is electrically connected with the control end of the PLC controller (11).

2. The automatic steering wheel rivet height detection device according to claim 1, characterized in that: The box (1) is also provided with a power module (15), and the surface of the box (1) is provided with a control switch (16), and the output end of the power module (15) is electrically connected with the position switch (4), the digital dial gauge (9), the concentrator (10), the PLC controller (11) and the touch screen all-in-one machine (12) through the control switch (16).

3. The automatic steering wheel rivet height detection device according to claim 1, characterized in that: The position switch (4) is a proximity switch or a micro switch.

4. The automatic steering wheel rivet height detection device according to claim 1, characterized in that: The fixed support (8) is provided with four and is distributed on both sides of the bottom of the limiting plate (6), and the concentrator (10) adopts a four-way concentrator.

5. The automatic steering wheel rivet height detection device according to claim 1, characterized in that: The bottom of the box (1) is provided with a universal wheel (17) with locking function.

6. The automatic steering wheel rivet height detection device according to claim 1, characterized in that: The concentrator (10) and the PLC controller (11) communicate through the 485 communication line and adopt the Modbus RTU protocol.

7. The automatic steering wheel rivet height detection device according to claim 1, characterized in that: The limiting plate (6) and the top of the supporting column (5) are fixedly connected through a bolt (18), and the limiting plate (6) is provided with multiple specifications to adapt to different specifications of the steering wheel.

8. A steering wheel rivet height automatic detection method using the automatic detection device according to any one of claims 1 to 7, characterized by, The following steps are included: S1: system initialization and parameter setting: set the qualified tolerance range of the rivet height through the touch screen all-in-one machine (12); S2: calibration step: the standard block is placed in the positioning groove (3) of the detection tool platform (2) and is in contact with the positioning column (7), triggering the position switch (4); the PLC controller (11) receives the position signal of the position switch (4), collects the readings of the dial gauges (9) at this time through the hub (10), and sets the readings as the reference value; S3: product placement and position judgment step: the steering wheel to be detected is placed on the detection tool platform (2), the rim is embedded in the positioning groove (3), and the skeleton bottom cover is sleeved on the positioning column (7); when the position switch (4) is triggered and sends a position signal to the PLC controller (11), it is determined that the steering wheel is installed in place, and the next step is executed; if no position signal is received, the touch screen all-in-one machine (12) prompts the installation abnormality; S4: data acquisition step: after the PLC controller (11) confirms that the steering wheel is in place, the real-time measurement data of each dial gauge (9) on the corresponding rivet is collected through the hub (10); S5: data processing and judgment step: the PLC controller (11) processes the collected measurement data, calculates the actual height value of each rivet, and compares the actual height value with the preset qualified tolerance range; S6: result output step: if the actual height value of all rivets is within the qualified tolerance range, the product is determined to be qualified, and the qualified information is displayed on the touch screen all-in-one machine (12); if the actual height value of any rivet exceeds the qualified tolerance range, the product is determined to be unqualified, and the PLC controller (11) controls the alarm indicator (14) to send an alarm signal.

9. The method of claim 8, wherein: In the data acquisition step S4, the PLC controller (11) and the hub (10) communicate with each other using Modbus RTU protocol; the PLC controller (11) sends a query command frame containing the slave address and function code to the hub (10), and the hub (10) responds and returns a data frame containing the measurement data of multiple dial gauges (9).

10. The method of claim 8, wherein the method further comprises: In the data processing and judgment step S5, the data frame is subjected to CRC check to ensure data integrity; after the check is passed, the hexadecimal measurement data in the data frame is analyzed and converted into the actual height value in decimal.

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