Workpiece positioning pin missing detection device based on photoelectric induction
By using photoelectric sensing devices and pneumatic blowing devices, efficient, accurate, and non-contact detection of missing workpiece positioning pins is achieved, solving the problems of low detection efficiency, easy error and high cost in existing technologies. It can adapt to different workpiece shapes and reduce production costs.
Patent Information
- Application Number
- CN202520402221.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-03-10
AI Technical Summary
In existing technologies, the detection of missing workpiece positioning pins is inefficient, error-prone, and costly, and contact detection is prone to damaging the workpiece and has poor adaptability.
A non-contact detection method based on photoelectric sensing is adopted, which uses infrared light signals to detect the presence or absence of positioning pins, combined with a pneumatic blowing device to remove dust, and realizes automated detection and alarm through a programmable logic controller.
It achieves efficient, accurate, and non-contact detection of missing positioning pins, avoids workpiece damage, adapts to different sizes and shapes, reduces production costs, and meets the needs of automated production lines.
Smart Images
Figure CN223770415U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of workpiece inspection technology, specifically a workpiece positioning pin missing detection device based on photoelectric sensing. Background Technology
[0002] In the machinery manufacturing and assembly industry, locating pins are a commonly used positioning element, widely applied for the precise positioning of various workpieces. The absence or improper installation of locating pins can lead to deviations in subsequent processes and even cause product quality problems.
[0003] Currently, the primary method for detecting whether locating pins are installed on workpieces is manual visual inspection. This is the most common method, but it has the following drawbacks: 1. Low efficiency: Manual inspection is slow and cannot meet the cycle time requirements of automated production lines. 2. Prone to errors: Long hours of manual work can lead to fatigue, resulting in missed or incorrect inspections, affecting product quality. 3. High cost: It requires a large investment of manpower, increasing production costs.
[0004] Secondly, contact-based mechanical inspection is used: A probe or sensor is used to contact the workpiece surface to determine the presence of a locating pin. This method has the following disadvantages: 1. Easily damages the workpiece: The probe may scratch the workpiece surface, affecting the product's appearance. 2. Poor adaptability: Different probes or sensors are needed for locating pins of different sizes and shapes, making adjustments complex. 3. Limited accuracy: The accuracy of contact-based inspection is affected by probe wear and the surface roughness of the workpiece.
[0005] Therefore, there is a need for a high-efficiency, accurate, and non-contact workpiece locating pin missing detection device to overcome the shortcomings of existing technologies. Utility Model Content
[0006] Purpose of the utility model: A workpiece positioning pin missing detection device based on photoelectric sensing. This device can efficiently, accurately, and non-contactly detect whether a positioning pin is installed on a workpiece, thereby improving production efficiency and product quality and reducing production costs.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A workpiece positioning pin missing detection device based on photoelectric sensing, comprising:
[0009] Base: Used to support and secure the entire device, providing a stable working platform. The base is equipped with positioning mechanisms for mounting workpieces, such as V-blocks and clamps, ensuring the workpiece remains in a fixed position during inspection.
[0010] Electrical control box: Used to control the operation of the entire device, including signal transmission, signal reception, data processing, and alarm functions. The electrical control box has a built-in programmable logic controller or microcontroller for logic judgment and control.
[0011] Signal transmitter: Used to transmit optical signals of a specific frequency, such as infrared light or laser. The signal transmitter is mounted on a base and connected to the electrical control box via a signal cable.
[0012] Signal receiver: Used to receive optical signals emitted by the signal transmitter. The signal receiver is mounted on the base, opposite the signal transmitter, and connected to the electrical control box via a signal cable.
[0013] Target workpiece: The workpiece to be inspected, which should be equipped with locating pins.
[0014] Pneumatic blowing device: Used to blow away dust and debris from the surface of the workpiece before inspection, improving inspection accuracy. The pneumatic blowing device includes an air source, air pipes, and nozzles, with the nozzles aimed at the bottom surface of the workpiece.
[0015] Alarm device: Used to issue an audible and visual alarm when a missing locating pin is detected, alerting the operator. The alarm device is connected to the electrical control box.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] 1. Non-contact inspection: Avoids workpiece damage that may occur with contact inspection. 2. High efficiency: Fast inspection speed, meeting the cycle time requirements of automated production lines. 3. High precision: High accuracy of photoelectric sensing detection, not easily affected by workpiece surface roughness. 4. Strong adaptability: Can adapt to workpieces of different sizes and shapes by adjusting the height and changing the positioning mechanism. 5. High degree of automation: Can be integrated with automated production lines to achieve automatic inspection and alarm. 6. Low cost: Simple structure, easy to manufacture and maintain, reducing production costs. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of this utility model.
[0019] In the diagram: 1. Base; 2. Electrical control box; 3. Signal transmitter; 4. Signal line; 5. Signal receiver; 6. Target workpiece; 7. Positioning pin; 9. Pneumatic purging device; 10. Alarm device; 11. Positioning mechanism. Detailed Implementation
[0020] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.
[0021] Applicant's design Figure 1 The workpiece positioning pin missing detection device based on photoelectric sensing of this utility model includes a base 1, an electrical control box 2, a signal transmitter 3, a signal line 4, a signal receiver 5, a target workpiece 6, a positioning pin 7, an adjustable height bracket, a pneumatic blowing device 9, and an alarm device 10.
[0022] The base 1 is made of aluminum alloy profile, which has good stability and rigidity. The base 1 is equipped with a V-block as a positioning mechanism 11 for fixing cylindrical workpieces.
[0023] The electrical control box 2 has a built-in Siemens S7-200 PLC, which is used to control the operation of the entire device.
[0024] The signal transmitter 3 uses an infrared emitting tube, and the signal receiver 5 uses an infrared receiving tube. The signal transmitter 3 and the signal receiver 5 are respectively mounted on the base 1, and their mounting depth can be adjusted by adjusting screws to accommodate workpieces of different sizes.
[0025] The pneumatic blowing device 9 includes an air source, an air pipe, and a nozzle. The nozzle is aimed at the surface of the workpiece and is used to blow away dust and debris from the bottom surface of the workpiece.
[0026] The alarm device 10 uses an audible and visual alarm to issue an audible and visual alarm when the positioning pin 7 is detected to be missing.
[0027] Working principle: The target workpiece 6 to be inspected is placed on the positioning mechanism 11 of the base 1 to ensure that the workpiece position is fixed.
[0028] Start the pneumatic blowing device 9 to blow away dust and debris from the surface of the workpiece.
[0029] The electrical control box 2 controls the signal transmitter 3 to emit optical signals of a specific frequency.
[0030] If the target workpiece 6 is equipped with a positioning pin 7, the optical signal will be blocked by the positioning pin 7, and the signal receiver 5 will not be able to receive the signal.
[0031] If the positioning pin 7 is not installed on the target workpiece 6, the light signal will not be blocked, and the signal receiver 5 can receive the signal.
[0032] The electrical control box 2 makes a logical judgment based on whether the signal receiver 5 receives a signal:
[0033] If the signal receiver 5 does not receive a signal, it is determined that the workpiece is equipped with a positioning pin 7, and no alarm is issued.
[0034] If the signal receiver 5 receives a signal, it determines that the positioning pin 7 is not installed on the workpiece and activates the alarm device 10 to issue an audible and visual alarm.
[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A photoelectrically sensing based workpiece locating pin absence detection apparatus, characterized by, The utility model relates to a kind of target workpiece positioning device, including: The seat body, electric control box, signal transmitter, signal line and signal receiver, the signal transmitter and signal receiver are respectively installed on seat body, and oppositely arranged, the electric control box is connected with signal transmitter and signal receiver by signal line respectively, the electric control box is used to control signal transmitter to emit signal, and whether the positioning pin is installed on target workpiece is judged according to whether signal receiver receives signal.
2. A workpiece positioning pin absence detection device based on photoelectric sensing according to claim 1, characterized in that, It also includes a pneumatic purging device for purging the bottom surface of the target workpiece.
3. The photoelectrically induced workpiece positioning pin absence detection device of claim 1, wherein, It also includes an alarm device connected to the electric control box for issuing an alarm when a missing positioning pin is detected.
4. The photoelectrically induced workpiece positioning pin absence detection apparatus according to claim 1, wherein The seat body is provided with a positioning mechanism for fixing the target workpiece.
5. The photoelectrically induced workpiece positioning pin absence detection apparatus according to claim 1, wherein The depth position of the signal transmitter can be adjusted on the seat body to adjust the transmission distance between the signal receiver and the signal transmitter.