A cleaning mechanism of an oil nozzle and spark plug quality inspection equipment

Abstract

The utility model provides a kind of cleaning mechanism of oil injection nozzle, spark plug quality inspection equipment, including positioning mechanism, for accurate positioning and clamping to workpiece;Robot blowing structure is used to blow and clean the detection hole of the positioned workpiece;And electric control cabinet is electrically connected with the positioning mechanism and robot blowing structure.The utility model combines airtight positioning mechanism and lifting positioning mechanism by introducing, and the positioning confirmation signal generated thereby is used as the mandatory safety interlock of the start of robot blowing structure, a set of high-reliability closed-loop cleaning system is constructed, the risk of blowing invalid or mechanical collision caused by inaccurate workpiece positioning is eliminated, the high safety and effectiveness of precision detection hole cleaning process are ensured, and reliable guarantee is provided for the accuracy of subsequent visual inspection.

Description

Technical Field

[0001] This utility model relates to a cleaning mechanism for fuel injector and spark plug quality inspection equipment. Background Technology

[0002] Thorough and non-destructive cleaning of fuel injector holes and spark plug holes is a crucial prerequisite for ensuring inspection accuracy before precision visual inspection. In existing technologies, the cleaning station is usually independent of the inspection line or only has a simple air blowing function, which presents several problems. First, positioning accuracy is insufficient. Most cleaning equipment uses simple mechanical stops for positioning, resulting in poor repeatability. This means the cleaning nozzle cannot accurately align with deep holes every time, leading to unstable cleaning effects. Residual coolant or debris can directly cause misjudgments in subsequent inspections. Second, there is a lack of verification methods for positioning effectiveness. The equipment cannot detect whether the workpiece is not in position due to foreign objects on its bottom surface or a malfunctioning positioning mechanism. Blindly starting the cleaning robot or inspection equipment can easily lead to collisions between the nozzle or precision probe and the workpiece, causing costly equipment damage. Third, the cleaning process has a low level of intelligence. The air blowing and positioning actions lack reliable safety interlocks, and the timing and duration of air blowing are not precisely controlled. Therefore, there is an urgent need for a cleaning mechanism that integrates high-precision positioning, active verification of positioning status, and intelligent safety interlocks to ensure the reliability of the inspection process and the consistency of inspection results from the source. Utility Model Content

[0003] This invention provides a cleaning mechanism for fuel injector and spark plug quality inspection equipment, which can effectively solve the above-mentioned problems.

[0004] This utility model is implemented as follows: A cleaning mechanism for a fuel injector and spark plug quality inspection equipment, installed at the cleaning station of the main conveyor roller conveyor, includes: Positioning mechanism, used for precise positioning and clamping of workpieces; A robot air-blowing structure is used to clean the detection holes of a positioned workpiece by blowing air; and an electrical control cabinet is electrically connected to the positioning mechanism and the robot air-blowing structure. The positioning mechanism includes a lifting positioning mechanism and an airtight positioning mechanism. The electrical control cabinet activates the robot's air blowing structure only after receiving a positioning confirmation signal from the airtight positioning mechanism.

[0005] The beneficial effects of this utility model are: (1) This utility model introduces an airtight positioning mechanism combined with a lifting positioning mechanism, and uses the positioning confirmation signal generated by this as a mandatory safety interlock for starting the robot's air blowing structure, thus constructing a highly reliable closed-loop cleaning system. This eliminates the risk of ineffective air blowing or mechanical collision caused by inaccurate workpiece positioning, ensuring the high safety and effectiveness of the precision inspection hole cleaning process, and providing a reliable guarantee for the accuracy of subsequent visual inspection. Attached Figure Description

[0006] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0007] Figure 1 This is the front view of this utility model.

[0008] Figure 2 This is a utility model Figure 1 A magnified view of part of D.

[0009] Figure 3 This is a partial structural diagram of the device of this utility model.

[0010] Figure 4 This is a utility model Figure 3 A magnified view of part E in the image. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0012] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0013] Reference Figure 1-4 As shown, a cleaning mechanism for a fuel injector and spark plug quality inspection equipment includes: a cleaning station installed at the main machine conveyor roller conveyor. The positioning mechanism is used for precise positioning and clamping of the workpiece; the positioning mechanism also includes a front positioning mechanism and side positioning mechanisms; the front positioning mechanism and side positioning mechanisms are driven by electric cylinders; the positioning mechanism includes a lifting positioning mechanism 40 and an airtight positioning mechanism 50; the control cabinet 10 only starts the robot air blowing structure 30 after receiving a positioning confirmation signal from the airtight positioning mechanism 50; the lifting positioning mechanism 40 is composed of a precision module driven by a servo motor; the control cabinet 10 interrupts the process and triggers an alarm when it does not receive a positioning confirmation signal; the airtight positioning mechanism 50 is integrated into the top positioning block of the lifting positioning mechanism 40, and its internal... The air vent is connected to a pressure sensor. The positioning confirmation signal is generated when the pressure sensor detects that the pressure value reaches and stabilizes above the preset threshold within a set time after a preset pressure gas is introduced into the airtight positioning mechanism 50. The airtight positioning mechanism 50 is not an independent component, but is directly integrated into the top positioning block of the lifting positioning mechanism 40. The positioning block has a precision-machined through air passage, and its outlet is located on the plane in contact with the bottom surface of the workpiece. The air passage is connected to a high-sensitivity piezoresistive pressure sensor and an air source processing unit (including a precision pressure regulating valve and a filter) installed in the electrical control cabinet 10 through a hose.

[0014] Specifically, after the workpiece enters the cleaning station, the drive cylinder of the front positioning mechanism first actuates, extending its stop block to precisely block the workpiece's movement in the conveying direction (Y-axis). Immediately afterwards, the two drive cylinders of the side positioning mechanisms receive synchronization signals and move synchronously and at equal speed towards each other from the left and right sides of the workpiece. Their V-shaped or flat clamping blocks contact the sides of the workpiece and apply a preset clamping force (e.g., 300N), thereby eliminating the workpiece's degrees of freedom in the X-axis direction and rotation in the horizontal plane. The electric cylinder drive ensures stable and controllable positioning speed and force. After horizontal positioning is completed, the lifting positioning mechanism 40 begins operation. This mechanism consists of a servo motor-driven high-precision ball screw module, achieving a repeatability of ±0.02mm. The servo module drives the top positioning block to move vertically upwards, smoothly lifting the workpiece off the surface of the main conveyor rollers, completing precise positioning in the Z-axis. This ensures that the workpiece is lifted to the same detection reference height each time. Furthermore, the robot blowing structure 30 consists of a robotic arm 300 and an air nozzle at the end. A spring buffer structure 304 is provided at the root of the air nozzle. When the robotic arm 300 has a slight positioning deviation that causes the air nozzle to accidentally contact the workpiece, this structure can provide buffering and avoid damage to the workpiece or the air nozzle from a hard collision. At the same time, an inductive switch (302, such as an infrared proximity switch) is installed next to the air nozzle. When the robotic arm moves the air nozzle close to the workpiece detection hole, the signal will only be fed back to the PLC when the inductive switch detects that the distance between the air nozzle and the hole is within the preset precise alignment range (such as 2±0.5mm). After receiving the alignment success signal, the PLC immediately triggers the solenoid valve to open and performs a short (such as 0.5 seconds) but strong high-pressure purging. This "blow only when in position" logic ensures that the compressed air is used most efficiently to remove residual coolant or metal debris in the hole, avoiding energy waste and incomplete cleaning caused by blind blowing.

[0015] The robot air blowing structure 30 is used to clean the detection holes of the positioned workpiece by blowing air; and the electrical control cabinet 10 is electrically connected to the positioning mechanism and the robot air blowing structure 30. The robot air blowing structure 30 includes a robot arm 300 and an air nozzle installed at the end of the robot arm. A spring buffer structure 304 is provided at the root of the air nozzle. The robot air blowing structure 30 also includes an inductive switch 302 installed next to the air nozzle for detecting the alignment of the air nozzle with the detection hole of the workpiece.

[0016] When a slight deviation in the positioning of the robotic arm 300 causes accidental contact between the air nozzle and the workpiece, this structure provides a buffer to avoid hard collisions that could damage the workpiece or the air nozzle. Simultaneously, a proximity switch (302, such as an infrared proximity switch) is installed next to the air nozzle. When the robotic arm moves the air nozzle close to the workpiece's detection hole, the signal is only sent to the PLC when the proximity switch detects that the distance between the air nozzle and the hole is within a preset precise alignment range (e.g., 2±0.5mm). Upon receiving the alignment success signal, the PLC immediately triggers the solenoid valve to open, performing a brief (e.g., 0.5 seconds) but powerful high-pressure purging. This "purge only when in position" logic ensures that compressed air is used most efficiently to remove residual coolant or metal debris from the hole, avoiding energy waste and incomplete cleaning caused by blindly blowing air.

[0017] Furthermore, the robotic air blowing structure 30 can also integrate an adaptive cleaning unit, which consists of one or more of a micro-differential pressure sensor, a flow monitor, and an acoustic pickup, together with the processing algorithm within the electrical control cabinet 10. The following embodiments are included: Example 1 (Based on Flow Resistance Monitoring): A micro differential pressure sensor is integrated inside the air nozzle. When the air nozzle is aligned with the detection hole and air blowing begins, the sensor detects the pressure difference between the inlet and outlet of the air nozzle. The control cabinet 10 reads this pressure difference value in real time. If the pressure difference value rises rapidly and remains high at the beginning of air blowing, it indicates that the air path is unobstructed, and there may be large foreign particles in the hole. If the pressure difference value remains low, it may mean that the air nozzle is not fully aligned or that the hole itself is a through hole, resulting in serious gas leakage. The control cabinet 10 can dynamically adjust the duration of this air blowing according to a preset pressure difference-time model. For example, for holes with high air resistance, the air blowing time is automatically extended by 0.2 seconds to ensure that stubborn impurities are blown away.

[0018] Example 2 (Based on Audio Feedback): A high-frequency acoustic pickup (microphone) is installed near the air nozzle to collect the sound signal generated during air blowing. The electrical control cabinet 10 has pre-stored the acoustic signature characteristics (mainly high-frequency airflow sound) of the normal cleaning state. When air blowing begins, the system performs real-time acoustic signature comparison. If a specific low-frequency friction or impact sound is identified in the airflow sound, it can be determined that particulate matter is being blown out and colliding with the hole wall. When this abnormal sound signal disappears, the system can determine that the hole has been cleaned and immediately terminate the air blowing, instead of mechanically waiting for a fixed air blowing time to end, thereby achieving energy saving and optimizing the cycle.

[0019] Through the aforementioned adaptive strategy, the cleaning mechanism of this invention can be upgraded from simple 'execution' to an intelligent closed loop of 'perception-decision-execution', providing personalized cleaning solutions for the actual conditions of each hole, thereby further improving cleaning efficiency and economy while ensuring cleaning quality.

[0020] Working principle: After the workpiece enters the cleaning station, the front positioning mechanism and the two side positioning mechanisms work together to complete the coarse positioning and clamping in the horizontal direction. Then, the lifting positioning mechanism, driven by a servo motor, precisely positions the workpiece to the detection reference height. At the same time, the airtight positioning mechanism integrated in the lifting positioning block introduces compressed air into the sealed air passage. Only when the control cabinet detects that the air pressure reaches and stabilizes at the preset threshold within a set time is the workpiece positioned accurately and a safety interlock signal is generated. After that, the robot blowing mechanism is allowed to start. Its robotic arm moves the end blowing nozzle towards the detection hole. Collision protection is achieved by the spring buffer structure, and the alignment distance is accurately detected by the inductive switch. Only after the alignment is confirmed is the solenoid valve triggered to perform high-pressure blowing. Furthermore, by integrating an adaptive cleaning unit composed of a micro-differential pressure sensor or a sound wave pickup, the system can monitor the flow resistance change or sound signature characteristics of the blowing process in real time, dynamically adjust the blowing time or intelligently determine the cleaning endpoint, thereby realizing a closed-loop control of the entire process from "positioning verification - safe alignment - precise cleaning - intelligent optimization", which effectively improves efficiency and economy while ensuring cleaning quality.

[0021] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cleaning mechanism for a fuel injector and spark plug quality inspection equipment, installed at the cleaning station of the main conveyor roller conveyor, characterized in that, include: Positioning mechanism, used for precise positioning and clamping of workpieces; Robotic air blowing structure (30) for cleaning the detection holes of the positioned workpiece by blowing air; and electrical control cabinet, electrically connected to the positioning mechanism and the robotic air blowing structure (30); The positioning mechanism includes a lifting positioning mechanism (40) and an airtight positioning mechanism (50). The electrical control cabinet starts the robot blowing structure (30) only after receiving the positioning confirmation signal issued by the airtight positioning mechanism (50).

2. The cleaning mechanism of the fuel injector and spark plug quality inspection equipment according to claim 1, characterized in that, The positioning mechanism also includes a front windshield positioning mechanism and side positioning mechanisms.

3. The cleaning mechanism of the fuel injector and spark plug quality inspection equipment according to claim 1, characterized in that, The airtight positioning mechanism (50) is integrated into the top positioning block of the lifting positioning mechanism (40), and has an air hole inside that is connected to a pressure sensor.

4. The cleaning mechanism of the fuel injector and spark plug quality inspection equipment according to claim 3, characterized in that, The positioning confirmation signal is generated when the pressure sensor detects that the pressure value reaches and stabilizes above the preset threshold within a set time after a preset pressure gas is introduced into the airtight positioning mechanism (50).

5. The cleaning mechanism of the fuel injector and spark plug quality inspection equipment according to claim 1, characterized in that, The robot blowing structure (30) includes a robotic arm (300) and a blowing nozzle installed at the end of the robotic arm, wherein a spring buffer structure (304) is provided at the root of the blowing nozzle.

6. The cleaning mechanism of the fuel injector and spark plug quality inspection equipment according to claim 5, characterized in that, The robot blowing structure (30) also includes an induction switch (302) installed next to the blowing nozzle, used to detect the alignment of the blowing nozzle with the workpiece detection hole.

7. The cleaning mechanism of the fuel injector and spark plug quality inspection equipment according to claim 1, characterized in that, The lifting and positioning mechanism (40) is composed of a precision module driven by a servo motor.

8. The cleaning mechanism of a fuel injector and spark plug quality inspection equipment according to claim 2, characterized in that, The front gear positioning mechanism and the side positioning mechanisms are driven by electric cylinders.

9. The cleaning mechanism of a fuel injector and spark plug quality inspection equipment according to claim 1, characterized in that, If the electrical control cabinet does not receive the positioning confirmation signal, it will interrupt the process and trigger an alarm.

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