Automatic measuring device for inner diameter of shaft sleeve
By combining plug gauges, bottom positioning gripper modules, electric cylinders, pressure sensors, and servo electric cylinders, fully automatic high-precision measurement of the inner diameter of the bushing is achieved, solving the problems of unstable measurement accuracy, low efficiency, and insufficient data traceability in existing technologies, and realizing efficient and reliable automated inspection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINAN HONGZHENG TECH
- Filing Date
- 2025-07-24
- Publication Date
- 2026-06-02
AI Technical Summary
Existing technologies for measuring the inner diameter of bushings suffer from problems such as unstable measurement accuracy, low efficiency, lack of effective monitoring and data traceability. In particular, it is difficult to ensure the consistency of results during batch testing. Furthermore, manual measurement is labor-intensive, and the equipment lacks a reliable secondary positioning mechanism and has inaccurate pressure control.
By combining plug gauges, bottom positioning gripper modules, electric cylinders, pressure sensors, and servo electric cylinders, fully automatic high-precision measurement of the bushing inner diameter is achieved through secondary positioning and servo control. Combined with a controller, real-time monitoring and data storage of pressure and displacement are performed to realize closed-loop feedback and automatic judgment in the measurement process.
It achieves fully automated high-precision detection of bushing inner diameter, with no manual intervention required during the measurement process. The single-piece detection time is reduced to the second level, the repeatability accuracy is improved to the micrometer level, the pressure monitoring function reduces product damage rate, and the measurement data recording provides a reliable basis for production process optimization, thereby improving the accuracy and reliability of the detection results.
Smart Images
Figure CN224316977U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical manufacturing testing technology, specifically relating to an automated measuring device for the inner diameter of a bushing. Background Technology
[0002] In the field of mechanical manufacturing, bushings are key transmission and support components, and the accuracy of their inner diameter directly affects assembly quality and equipment operational stability. Traditional manual measurement methods, using handheld plug gauges for go / no-go gauge inspection, suffer from inconsistent measurement accuracy and low efficiency. Subjective factors such as the operator's hand strength and insertion angle can easily lead to measurement deviations, making it difficult to guarantee consistent results, especially in batch inspections. Furthermore, manual measurement is labor-intensive, and prolonged operation can easily cause fatigue-related misjudgments, failing to meet the high-speed inspection requirements of modern production lines.
[0003] While existing semi-automatic measuring equipment has improved efficiency to some extent, it still suffers from numerous technical shortcomings. These devices generally lack reliable secondary positioning mechanisms, leading to easy misalignment of the bushing during measurement and causing coaxiality deviations between the plug gauge and the inner diameter. Furthermore, these devices lack precise control over the pressure and speed during plug gauge insertion, potentially damaging the workpiece due to excessive pressure or causing misjudgments due to insufficient pressure. More importantly, existing equipment lacks a comprehensive anomaly monitoring mechanism, failing to provide timely warnings and handle unexpected situations during the measurement process.
[0004] In terms of data management, traditional measurement methods and existing equipment have failed to achieve automatic recording and storage of measurement data, severely restricting the ability to trace quality and conduct statistical analysis in the production process. This data deficiency makes it difficult for enterprises to carry out effective quality control and fails to meet the refined quality management requirements of modern manufacturing. Therefore, there is an urgent need for a technical solution that can achieve fully automated, high-precision measurement of bushing inner diameter to solve the systemic technical problems existing in current technologies, such as unstable measurement accuracy, low efficiency, lack of effective monitoring, and lack of data traceability. Utility Model Content
[0005] This invention provides an automated measuring device for the inner diameter of a bushing to solve at least one of the aforementioned technical problems.
[0006] The technical solution adopted in this utility model is as follows:
[0007] An automated measuring device for the inner diameter of a bushing includes a plug gauge, designed and manufactured according to the GB / T1957-2006 technical standard for smooth limit gauges, with the working parts divided into a GO end and a NOGO end;
[0008] Bottom positioning gripper module is used for secondary clamping and positioning of the product;
[0009] An electric cylinder, connected to the plug gauge, is used to drive the plug gauge to move downwards;
[0010] A pressure sensor is installed at the connecting shaft, which is a connecting component between the electric cylinder and the plug gauge. The connecting shaft is used to transmit the driving force of the electric cylinder to the plug gauge, and the pressure sensor is used to detect the pressure when the electric cylinder drives the plug gauge.
[0011] A servo electric cylinder works in conjunction with the electric cylinder to control the speed and pressure of the plug gauge as it enters the inner diameter of the product.
[0012] Preferably, this application further proposes that the bottom positioning gripper module includes a drive mechanism and grippers, wherein the drive mechanism is used to drive the grippers to reciprocate and slide so that the grippers clamp / release the product.
[0013] Preferably, this application further proposes that it also includes a controller, which is electrically connected to the electric cylinder, pressure sensor and servo electric cylinder, for receiving signals from the pressure sensor and controlling the operation of the electric cylinder and servo electric cylinder according to the signals.
[0014] Preferably, this application further proposes that the controller has a preset qualified pressure range and a qualified distance range. When the pressure detected by the pressure sensor is within the qualified pressure range and the distance the plug gauge enters the inner diameter of the product is within the qualified distance range, the product is determined to be qualified; otherwise, the product is determined to be unqualified.
[0015] Preferably, this application further proposes that when the pressure detected by the pressure sensor exceeds a preset alarm pressure value, the controller controls the device to sound an alarm.
[0016] Preferably, this application further proposes that the dimensional accuracy of the GO end and NOGO end of the plug gauge is within ±0.01mm.
[0017] Preferably, this application further proposes that the measurement accuracy of the pressure sensor is within ±0.1N.
[0018] Preferably, this application further proposes that the speed control accuracy of the servo electric cylinder is within ±0.01mm / s.
[0019] Preferably, this application further proposes that it also includes a protective cover disposed around the measuring device to prevent operators from coming into contact with the moving parts.
[0020] Preferably, this application further proposes that the device also includes a data storage module for storing measurement data, the data storage module being electrically connected to the controller.
[0021] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows:
[0022] 1. This application realizes fully automatic high-precision detection of bushing inner diameter, with no manual intervention required in the measurement process, and the detection time for a single piece is shortened to the second level; through secondary positioning and servo control, the repeatability of product measurement is improved to the micrometer level; the real-time pressure monitoring function reduces the product damage rate to less than 0.05%; and the complete measurement data recording provides a reliable basis for production process optimization.
[0023] 2. This solution, through the step-by-step actions of the lifting mechanism and the gripper, actively corrects the product position before clamping, effectively solving the measurement error problem caused by product placement deviation. This application can perform dual positioning compensation for the product in both height and horizontal directions before measurement, avoiding the phenomenon of misalignment between the plug gauge and the inner diameter axis caused by product offset, thereby improving the accuracy and consistency of measurement results, while reducing the risk of misjudgment or equipment damage due to the product not being clamped.
[0024] 3. This solution achieves closed-loop feedback in the measurement process through the coordinated control of the controller, pressure sensor, electric cylinder, and servo electric cylinder. It proactively responds to pressure fluctuations and avoids measurement failures caused by external interference. This application solves the problems of low measurement accuracy and poor equipment reliability in existing technologies due to the lack of real-time pressure feedback control. It realizes automatic adjustment of pressure and speed during the measurement of the bushing inner diameter, and provides fundamental support for the storage and analysis of measurement data.
[0025] 4. This solution achieves objective quantitative evaluation of the measurement process through preset parameter thresholds and an automatic comparison mechanism. This application solves the problems of large subjective judgment errors in manual measurement and the lack of precise judgment standards in semi-automatic equipment, realizing automatic determination of the conformity of the bushing inner diameter. Through dual parameter monitoring of pressure and displacement, it effectively avoids the erroneous rejection of qualified products or the missed detection of unqualified products due to single-factor misjudgment, significantly improving the reliability of the test results.
[0026] 5. This solution achieves rapid identification and handling of abnormal operating conditions through the linkage control of pressure threshold judgment and automatic alarm. This application can monitor pressure changes in real time during the measurement process, and immediately trigger an alarm and interrupt the measurement process when the pressure exceeds the safe range. This effectively avoids equipment damage or product damage caused by overload, while reducing the response delay of manual inspection, significantly improving the safety and reliability of the measurement process. Attached Figure Description
[0027] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model;
[0028] Figure 2 This utility model Figure 1Enlarged view of section A in the middle.
[0029] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.
[0030] In the attached diagram:
[0031] 1. Plug gauge; 11. Connecting shaft; 2. Electric cylinder; 3. Servo electric cylinder; 4. Pressure sensor; 5. Bottom positioning gripper module; 51. Drive mechanism; 52. Gripper. Detailed Implementation
[0032] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.
[0033] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.
[0034] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0036] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0037] Reference Figures 1 to 2 An automated measuring device for the inner diameter of a bushing includes a plug gauge 1, designed and manufactured according to the GB / T1957-2006 standard for smooth limit gauges, with working parts divided into a GO end and a NOGO end; a bottom positioning gripper module 52 for secondary clamping and positioning of the product; an electric cylinder 2 connected to the plug gauge 1 for driving the plug gauge 1 downward; a pressure sensor 4 installed at a connecting shaft 11, which is the connecting component between the electric cylinder 2 and the plug gauge 1, for transmitting the driving force of the electric cylinder 2 to the plug gauge 1, and the pressure sensor 4 for detecting the pressure when the electric cylinder 2 drives the plug gauge 1; and a servo electric cylinder 3 working in conjunction with the electric cylinder 2 to control the speed and pressure of the plug gauge 1 entering the inner diameter of the product.
[0038] Among them, plug gauge 1 refers to a testing tool conforming to the standard of smooth limit gauges, which can be made of hardened steel. The diameter of the GO end corresponds to the lower limit of the inner diameter of the bushing, and the NOGO end corresponds to the upper limit, used to determine whether the product size is within the tolerance range. The bottom lifting positioning gripper 52 module refers to a mechanism with vertical lifting and radial clamping functions, which can be implemented by a cylinder-driven lifting platform in conjunction with pneumatic grippers 52, used to perform position correction and fixation of the bushing before measurement. Electric cylinder 2 refers to an actuator that converts the motion of a rotary motor into linear motion, which can be implemented by a ball screw transmission structure, used to precisely control the axial displacement of plug gauge 1. Pressure sensor 4 refers to a sensing element that detects axial force, which can be implemented by a strain gauge integrated inside the connecting shaft 11, used to monitor the contact pressure when plug gauge 1 is inserted in real time. Servo electric cylinder 3 refers to a linear drive device with closed-loop control of speed and pressure, which can be implemented by a combination of a servo motor and a planetary roller screw, used to dynamically adjust the insertion process parameters of plug gauge 1.
[0039] Specifically, during measurement, the bushing is conveyed to the working area of the bottom lifting and positioning jaw 52 module. After the lifting mechanism raises the bushing to the measurement height, the jaw 52 clamps it radially to eliminate the clamping gap. The electric cylinder 2 drives the plug gauge 1 to descend axially, and the servo electric cylinder 3 synchronously adjusts the descending speed and contact pressure. When the GO end of the plug gauge 1 enters the inner diameter of the bushing, the pressure sensor 4 continuously monitors the contact pressure. If the pressure value is within the preset qualified range and the plug gauge 1 completely passes through the inner diameter, it is determined as qualified; if the NOGO end cannot enter or the pressure is abnormal, it is determined as unqualified. The entire process realizes the closed-loop management of motion control and signal processing through the controller.
[0040] Compared with the prior art, manual operation is completely replaced by an automated mechanical structure, eliminating measurement deviations caused by human factors; the bottom lifting and positioning jaw 52 module realizes the precise positioning of the bushing, solving the coaxiality deviation problem common in semi-automatic equipment; the coordinated control of the pressure sensor 4 and the servo electric cylinder 3 enables the plug gauge 1 to have a pressure protection function during the insertion process, avoiding damage to products or gauges; the integrated control system can automatically record and analyze measurement data, filling the data traceability gap of traditional detection methods.
[0041] Through the above technical solutions, the present application realizes the full-automatic and high-precision detection of the inner diameter of the bushing. The measurement process requires no manual intervention, and the single-piece detection time is shortened to the second level; through secondary positioning and servo control, the repeated positioning accuracy of product measurement is improved to the micron level; the real-time pressure monitoring function reduces the product damage rate to less than five per ten thousand; the complete measurement data record provides a reliable basis for the optimization of the production process.
[0042] As a specific implementation manner of the bottom positioning jaw 52 module 5, referring to Figure 1 and Figure 2 , the bottom positioning jaw 52 module 5 includes a driving mechanism 51 and a jaw 52. The driving mechanism 51 is used to drive the jaw 52 to slide reciprocally so that the jaw 52 clamps / releases the product. Among them, the driving mechanism 51 is a device that drives two oppositely arranged jaws 52 to achieve relative displacement through mechanical transmission. Specifically, it can be realized by a cylinder or a lead screw module driven by a servo motor. Its function is to accurately position the product from the initial position to the measurement station, ensuring that the inner diameter of the bushing and the plug gauge 1 remain coaxial during the subsequent measurement process. Among them, the jaw 52 refers to an execution component that fixes the product through clamping force. Specifically, it can be realized by a pneumatic parallel jaw 52 or an electric three-jaw chuck. Its function is to radially clamp the product after the lifting mechanism completes the positioning, preventing the product from shifting due to external force or vibration during the measurement process.
[0043] Specifically, after the product is placed in the initial position of the bottom lifting and positioning gripper 52 module, the lifting mechanism is activated first, raising the product to the measurement height through vertical movement. At this time, the gripper 52 closes and applies a uniform clamping force to the outer wall of the product, fixing the product in both the axial and radial directions. The coordinated action of the lifting mechanism and the gripper 52 achieves a secondary positioning function, that is, firstly, the vertical lifting eliminates the positional deviation in the height direction, and then the gripper 52 eliminates the horizontal offset, thereby ensuring that the inner diameter axis of the product is completely aligned with the movement path of the plug gauge 1.
[0044] Compared to existing technologies, traditional semi-automatic equipment relies solely on a single clamping mechanism to fix the product, lacking the ability to actively adjust in the vertical direction. This results in the coaxiality of the bushing and plug gauge 1 being significantly affected by the initial placement position. This solution, through the step-by-step actions of the lifting mechanism and the gripper 52, actively corrects the product position before clamping, effectively solving the measurement error problem caused by product placement deviation. This application enables dual positioning compensation of the product in both height and horizontal directions before measurement, avoiding misalignment between the plug gauge 1 and the inner diameter axis due to product offset. This improves the accuracy and consistency of measurement results while reducing the risk of misjudgment or equipment damage due to improper product clamping.
[0045] In a preferred embodiment of this application, a controller is also included. The controller is electrically connected to the electric cylinder 2, the pressure sensor 4, and the servo electric cylinder 3. The controller receives signals from the pressure sensor 4 and controls the operation of the electric cylinder 2 and the servo electric cylinder 3 based on these signals. The controller is an electronic device capable of receiving sensor signals and outputting control commands. Specifically, it can be implemented using a programmable logic controller (PLC) or an industrial computer, achieving automated control logic through a preset program. Electrical connection refers to establishing a signal transmission channel via cable or wireless communication. Specifically, it can be implemented using an industrial bus or Ethernet protocol to ensure the real-time performance and reliability of signal transmission. Receiving signals from the pressure sensor 4 means acquiring real-time pressure data detected by the pressure sensor 4. Specifically, it can be implemented using an analog signal acquisition module or a digital communication interface to determine the pressure state during the measurement process. Controlling the operation of the electric cylinder 2 and the servo electric cylinder 3 means adjusting the motion parameters of the electric cylinder 2 and the output parameters of the servo electric cylinder 3 according to the pressure signal. Specifically, it can be implemented using a closed-loop control algorithm or a PID control method to ensure the stability of the insertion speed and pressure of the plug gauge 1.
[0046] Specifically, during the measurement process, the controller receives pressure data collected in real time by the pressure sensor 4 when the plug gauge 1 is inserted into the inner diameter of the bushing. When the pressure data exceeds a preset threshold, the controller sends commands to the electric cylinder 2 and the servo electric cylinder 3 to adjust the moving speed and driving force of the plug gauge 1, avoiding equipment damage or measurement errors due to excessive pressure. For example, in the initial stage of the plug gauge 1 entering the inner diameter of the bushing, the controller can control the servo electric cylinder 3 to advance at a lower speed to reduce impact; when abnormal pressure fluctuations are detected, the controller can immediately stop the movement of the electric cylinder 2 and trigger an alarm mechanism. Thus, the entire measurement process is dynamically adjusted by the controller to ensure the accuracy and safety of the measurement action.
[0047] Compared to existing technologies, current semi-automatic equipment typically relies on manual intervention or simple timing control, failing to adjust equipment actions based on real-time pressure data. This leads to issues such as gauge jamming or bushing positioning misalignment during measurement. This solution, however, achieves closed-loop feedback in the measurement process through coordinated control of the controller, pressure sensor 4, electric cylinder 2, and servo electric cylinder 3. This proactively addresses pressure fluctuations and prevents measurement failures caused by external interference. This application solves the problems of low measurement accuracy and poor equipment reliability in existing technologies due to the lack of real-time pressure feedback control. It enables automatic adjustment of pressure and speed during bushing inner diameter measurement and provides fundamental support for data storage and analysis.
[0048] As a preferred example of the above implementation method, the controller has preset qualified pressure range and qualified distance range. When the pressure detected by the pressure sensor 4 is within the qualified pressure range, and the distance the plug gauge 1 travels into the inner diameter of the product is within the qualified distance range, the product is deemed qualified; otherwise, the product is deemed unqualified. The qualified pressure range is the allowable axial pressure range when the plug gauge 1 is normally inserted into the inner diameter of the bushing, as determined by experimental calibration. Specifically, this can be achieved by the pressure sensor 4 collecting the driving force data of the electric cylinder 2 in real time and comparing it with the preset threshold range. This range setting can effectively avoid measurement errors or component damage caused by abnormal pressure. The qualified distance range is the axial displacement range within which the working end of the plug gauge 1 must completely enter the inner diameter of the bushing. Specifically, this can be achieved by the displacement encoder of the servo electric cylinder 3 recording the movement trajectory of the plug gauge 1, ensuring that the insertion depth of the plug gauge 1 meets the process requirements during the measurement process. The controller is an electronic control unit with integrated logic judgment function, which can be implemented using a PLC or embedded industrial control computer. It performs qualification judgment by receiving signals from the pressure sensor 4 and displacement data.
[0049] When the electric cylinder 2 drives the plug gauge 1 to press down, the pressure sensor 4 continuously collects axial pressure data and transmits it to the controller. Simultaneously, the displacement encoder of the servo electric cylinder 3 records the insertion depth of the plug gauge 1 in real time. The controller compares the received pressure data with the preset acceptable pressure range, and also compares the displacement data with the acceptable distance range. When both parameters are within the preset range, the controller generates a pass signal and records the measurement result; if either parameter exceeds the range, the measurement process is immediately terminated and the product is marked as unqualified.
[0050] Compared to existing technologies, traditional manual measurement relies on the operator's subjective judgment of the insertion depth of the plug gauge and the force applied, which carries the risk of misjudgment. While semi-automatic equipment can achieve mechanical operation, it lacks a synchronous monitoring mechanism for pressure and displacement, making it impossible to establish accurate pass / fail criteria. This solution achieves objective quantitative evaluation of the measurement process through preset parameter thresholds and an automatic comparison mechanism. This application solves the problems of large subjective judgment errors in manual measurement and the lack of accurate judgment criteria in semi-automatic equipment, realizing automatic judgment of the pass / fail status of the bushing inner diameter. By monitoring both pressure and displacement parameters, it effectively avoids the erroneous rejection of qualified products or the missed detection of unqualified products due to single-factor misjudgment, significantly improving the reliability of the test results.
[0051] Furthermore, when the pressure detected by pressure sensor 4 exceeds the preset alarm pressure value, the controller activates an alarm. The preset alarm pressure value is a pressure threshold set based on the bushing material strength, dimensional tolerances, and measurement process requirements. It can be determined through experimental data or process specifications; for example, it could be set to 50N for aluminum alloy bushings. This value must be lower than the critical pressure value that could cause deformation of the plug gauge 1 or the bushing. The equipment alarm is a warning device used to alert operators to measurement abnormalities. It can be implemented using an audible and visual alarm or a combination of a buzzer and LED indicator. For example, when the pressure exceeds the limit, a red warning light flashes and a buzzer sounds. Specifically, during the measurement process, pressure sensor 4 continuously collects pressure data when the plug gauge 1 is inserted into the bushing's inner diameter and transmits the signal to the controller. The controller compares the received pressure value with the preset alarm pressure value in real time. When the pressure exceeds the alarm pressure value, for example, if burrs or excessively small dimensions of the bushing's inner diameter cause abnormally increased resistance during measurement, the controller immediately sends a trigger signal to the alarm device, activating the audible and visual alarm. The measurement process will automatically pause at this point to prevent the plug gauge 1 from being damaged due to overload or the inner diameter of the bushing from being forcibly deformed. Operators can quickly locate the problem through alarm prompts, such as checking for machining defects in the bushing or mechanical interference with the measuring device.
[0052] Compared to existing technologies, traditional measurement methods and semi-automated equipment lack real-time monitoring and response mechanisms for pressure anomalies. When the measurement resistance increases abnormally, operators struggle to detect and intervene promptly, easily leading to wear of the plug gauge or damage to the bushing. This solution achieves rapid identification and handling of abnormal operating conditions through the linkage control of pressure threshold judgment and automatic alarm. This application can monitor pressure changes in real time during the measurement process, immediately triggering an alarm and interrupting the measurement process when the pressure exceeds the safe range. This effectively avoids equipment or product damage caused by overload, while reducing response delays from manual inspections, significantly improving the safety and reliability of the measurement process.
[0053] As a preferred example of plug gauge 1, the dimensional accuracy of the GO and NOGO ends of plug gauge 1 is within ±0.01mm. During machining, the GO and NOGO ends of plug gauge 1 undergo surface treatment using a precision grinding machine, and after machining, their dimensions are re-measured using a laser interferometer. When the GO end is inserted into the inner diameter of the bushing, if it passes completely without significant resistance, it indicates that the inner diameter is not less than the minimum limit value; when the NOGO end is inserted, if it cannot enter the inner diameter, it indicates that the inner diameter does not exceed the maximum limit value. Throughout this process, the dimensional accuracy of the GO and NOGO ends is controlled within ±0.01mm, thus providing a clear boundary for the critical judgment value of the go / no-go gauge inspection.
[0054] This solution improves machining accuracy, reducing the dimensional fluctuation range of the working part of plug gauge 1 and ensuring higher consistency in the inspection threshold. This application can accurately distinguish between the qualified and unqualified states of the bushing inner diameter, avoiding inspection errors caused by the dimensional deviation of plug gauge 1 itself, effectively preventing products with dimensions on the tolerance edge from being incorrectly judged, thereby improving the reliability of the inspection results.
[0055] As a preferred example, the pressure sensor 4 has a measurement accuracy within ±0.1N. During the insertion of the plug gauge 1 into the inner diameter of the bushing, the pressure sensor 4 collects the driving force applied by the electric cylinder 2 in real time through the connecting shaft 11. When the pressure value exceeds the preset range, it indicates that the fit between the plug gauge 1 and the inner diameter of the bushing is abnormal, possibly due to excessive or insufficient resistance caused by inner diameter deviation or assembly interference. By controlling the measurement accuracy of the pressure sensor 4 within ±0.1N, minute pressure fluctuations can be accurately identified, avoiding misjudgments or equipment overload risks caused by detection errors.
[0056] This solution introduces a high-precision pressure detection mechanism to achieve dynamic monitoring of the insertion resistance of plug gauge 1, solving the problem of unstable measurement results caused by inaccurate pressure control in traditional methods. This application can effectively identify abnormal resistance when the bushing inner diameter mates with plug gauge 1, avoiding misjudgments or equipment damage caused by pressure detection deviations. It also provides a reliable quantitative basis for determining product qualification, improving the stability and consistency of the measurement process.
[0057] As a preferred example of the servo electric cylinder 3, the speed control accuracy of the servo electric cylinder 3 is within ±0.01mm / s. The servo electric cylinder 3 and the electric cylinder 2 achieve synchronized movement through linkage control. The servo electric cylinder 3 outputs power according to preset speed parameters, driving the electric cylinder 2 to move the plug gauge 1 into the inner diameter of the bushing at a constant speed. Speed control accuracy is achieved by a closed-loop feedback system that monitors the relationship between actual displacement and time in real time, dynamically adjusting the motor output torque to compensate for speed deviations and prevent abnormal friction or impact between the plug gauge 1 and the inner diameter of the bushing due to speed fluctuations.
[0058] Compared to existing technologies, traditional semi-automatic equipment typically uses ordinary cylinders or stepper motors for drive, and speed control relies on mechanical limits or open-loop control. The actual operating speed is easily affected by air pressure fluctuations, load changes, and mechanical wear, leading to unstable insertion speed of the plug gauge 1. This solution, through the closed-loop control mechanism of the servo electric cylinder 3, effectively suppresses the influence of external interference on speed, ensuring precise and controllable movement trajectory of the plug gauge 1 during measurement. This application solves the measurement error problem caused by inaccurate speed control in existing technologies, avoids plug gauge 1 jamming or bushing damage caused by sudden speed changes, and improves the repeatability of the measurement process, making automated inspection results more stable and reliable.
[0059] In another preferred embodiment of this application, the device further includes a data storage module for storing measurement data, and the data storage module is electrically connected to the controller. The data storage module is a storage unit for storing data generated during the measurement process, and can be implemented using an embedded memory or an external database. It can record the detection values of the pressure sensor 4, the displacement of the plug gauge 1, and timestamps in real time. The electrical connection between the data storage module and the controller means that data transmission is achieved through a serial communication interface or an industrial bus, ensuring that the measurement data can be completely acquired and stored.
[0060] Specifically, during the measurement process, the controller integrates the real-time pressure data collected by pressure sensor 4, the displacement data fed back by servo electric cylinder 3, and time information into a structured data packet, which is then transmitted to the data storage module via a preset communication protocol. The data storage module categorizes and stores the data according to time sequence or product batch, forming a traceable measurement record database. After the measurement data is stored, it can be exported through a data interface for quality analysis or integrated with the production management system.
[0061] Compared to existing technologies, traditional manual measurement methods rely on paper records or scattered spreadsheets, which are prone to data loss and cannot achieve real-time storage. Semi-automated equipment typically only has temporary caching capabilities, and measurement data cannot be retained after power failure. This solution achieves persistent storage and systematic management of measurement data by integrating a dedicated data storage module. This application solves the problems of low data recording efficiency and error susceptibility in traditional measurement methods, avoiding clerical errors or omissions caused by manual recording. After the measurement data is fully saved, it can be directly used for production quality traceability, quickly locating abnormal batches of products, and providing data support for process parameter optimization.
[0062] For any parts not mentioned in this utility model, existing technologies can be used or referenced.
[0063] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.
[0064] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.
Claims
1. An automated measuring device for the inner diameter of a bushing, characterized in that, include: The plug gauge is designed and manufactured according to the GB / T1957-2006 technical standard for smooth limit gauges. The working parts are divided into the GO end and the NOGO end. Bottom positioning gripper module is used for secondary clamping and positioning of the product; An electric cylinder, connected to the plug gauge, is used to drive the plug gauge to move downwards; A pressure sensor is installed at the connecting shaft, which is a connecting component between the electric cylinder and the plug gauge. The connecting shaft is used to transmit the driving force of the electric cylinder to the plug gauge, and the pressure sensor is used to detect the pressure when the electric cylinder drives the plug gauge. A servo electric cylinder works in conjunction with the electric cylinder to control the speed and pressure of the plug gauge as it enters the inner diameter of the product.
2. The automated measuring device for the inner diameter of a bushing according to claim 1, characterized in that, The bottom positioning gripper module includes a drive mechanism and grippers. The drive mechanism is used to drive the grippers to slide back and forth so that the grippers clamp / release the product.
3. The automated measuring device for the inner diameter of a bushing according to claim 1, characterized in that, It also includes a controller, which is electrically connected to the electric cylinder, pressure sensor and servo electric cylinder, for receiving signals from the pressure sensor and controlling the operation of the electric cylinder and servo electric cylinder according to the signals.
4. The automated measuring device for the inner diameter of a bushing according to claim 3, characterized in that, The controller has a preset qualified pressure range and a qualified distance range. When the pressure detected by the pressure sensor is within the qualified pressure range and the distance the plug gauge enters the inner diameter of the product is within the qualified distance range, the product is determined to be qualified; otherwise, the product is determined to be unqualified.
5. The automated measuring device for the inner diameter of a bushing according to claim 3, characterized in that, When the pressure detected by the pressure sensor exceeds the preset alarm pressure value, the controller activates the alarm device to sound an alarm.
6. The automated measuring device for the inner diameter of a bushing according to claim 1, characterized in that, The dimensional accuracy of the GO end and NOGO end of the plug gauge is within ±0.01mm.
7. The automated measuring device for the inner diameter of a bushing according to claim 1, characterized in that, The pressure sensor has a measurement accuracy within ±0.1N.
8. The automated measuring device for the inner diameter of a bushing according to claim 1, characterized in that, The speed control accuracy of the servo electric cylinder is within ±0.01 mm / s.
9. The automated measuring device for the inner diameter of a bushing according to claim 1, characterized in that, It also includes a protective cover, which is disposed around the measuring device to prevent operators from coming into contact with the moving parts.
10. The automated measuring device for the inner diameter of a bushing according to claim 3, characterized in that, The device also includes a data storage module for storing measurement data, and the data storage module is electrically connected to the controller.