[0023] Such as Figure 1-4 As shown, the tool for automatic detection of piston workpiece oil holes provided by the present invention includes a carrier substrate 2 placed on the piston workpiece material passage transfer platform 1 and a detection unit and a positioning unit provided on the piston workpiece material passage transfer platform.
[0024] The detection unit includes two detection cylinders 3 arranged symmetrically. The protruding end of the detection cylinder is connected with a probe 4. The probe is guaranteed to correspond to the last piston oil hole 5 machined on one side of the piston workpiece, and the probe is connected to the piston oil. The holes are concentric circles. The positioning unit includes a positioning cylinder 6 and a first positioning block 7. The protruding end of the positioning cylinder is connected with a second positioning block 8. When the second positioning block matches the pin hole 9 of the piston workpiece, the second positioning block pushes the piston workpiece 10. Keep the other side of the piston workpiece in close contact with the first positioning block. In this embodiment, two first positioning blocks are provided on the piston workpiece foreboard transfer platform. When the second positioning block acts on the pin hole of the piston workpiece, the piston workpiece is clamped between the two first positioning blocks and the second positioning block. In the triangular space enclosed by the two positioning blocks, the piston workpiece to be tested can be relatively fixed on the piston workpiece foreboard transfer platform. Specifically, the positioning cylinder and the detection cylinder adopt a cylinder with a built-in magnetic ring of model AIRTAC CYLINDER SDAJ20X35-10S, and the positioning cylinder and the detection cylinder are equipped with a magnetic sensor 11 matched with the magnetic ring to facilitate sensing the extension length of the cylinder. Even if real-time sensing of the second positioning block and the length of the probe to be extended is achieved, at the same time, in the sensing state of the magnetic sensor, the extended length of the probe driven by the cylinder is detected, which is just in line with the qualification of the oil hole of the piston workpiece The hole depth corresponds. The intake ends of the positioning cylinder and the detection cylinder are respectively connected to an external air source end (external air pump) through a solenoid valve 15. In addition, a photoelectric switch 12 for sensing the piston workpiece placed on the carrier substrate is also provided on the piston workpiece foreboard transfer platform. The magnetic sensor, solenoid valve, and photoelectric switch are respectively connected to the piston transfer forehead of the piston workpiece production line Inside the control cabinet. When the photoelectric switch on the piston workpiece foreboard transfer platform senses the piston workpiece placed on the carrier substrate, it will generate an induction signal and feed it back to the PLC in the piston transfer foreboard control cabinet. The PLC controls the electromagnetic connected to the positioning cylinder The valve opens, the positioning cylinder moves and drives the second positioning block to push forward, and clamps the piston workpiece in the space enclosed by the first positioning block and the second positioning block. After the positioning of the piston workpiece on the carrier substrate is completed, The magnetic sensor of the positioning unit generates an induction signal and feeds it back to the PLC. The PLC controls the opening of the solenoid valve connected to the detection cylinder, detects the movement of the cylinder, and drives the probe to push forward and insert it into the last oil hole on one side of the piston workpiece to be detected Inside. Specifically, such as Figure 4 As shown in the cross-sectional view of the piston oil hole of the present invention, the number of piston oil holes is usually 8 holes, with 4 holes on the left and right sides. Generally, the drilling machine is a two-axis drilling machine, that is, both sides of the piston workpiece are processed at the same time. By analogy, ④⑧ is the final machining hole. Therefore, the present invention only needs to detect the ④⑧ hole, that is, the two detection cylinders of the detection unit act at the same time; if the machine tool is one-axis machining, it is processed sequentially from ① to ⑧, and ⑧ hole For the final processing of the hole, only the eighth processing hole needs to be inspected, and the two inspection cylinders of the inspection unit only need one action.
[0025] The automatic detection tool for the oil hole of the piston workpiece provided by the present invention is carried out in the specific detection process according to the following detection methods, which specifically include:
[0026] Step a: Place the piston workpiece on the carrier substrate. Set up the PLC in the piston transfer channel control cabinet to adjust the gripping angle of the piston workpiece to be tested by the manipulator to ensure that the piston pin hole of the piston workpiece placed on the carrier substrate corresponds to the protruding end of the positioning cylinder;
[0027] Step b: The positioning unit locates the piston workpiece and feeds back the positioning information to the PLC in the piston transfer channel control cabinet. Set up the PLC in the piston transfer material channel control cabinet to realize the linkage control of the positioning unit and the piston transfer material channel manipulator. The photoelectric switch on the piston workpiece material channel transfer platform senses the piston workpiece placed on the carrier substrate and generates an induction signal. Feedback to the PLC, the PLC controls the solenoid valve connected with the positioning cylinder to open, the positioning cylinder acts and drives the second positioning block to push forward, and clamps the piston workpiece in the space enclosed by the first positioning block and the second positioning block Inside.
[0028] Step c: The detection unit detects the oil hole of the piston workpiece, and feeds back the detection information to the PLC in the piston transfer channel control cabinet. Set up the PLC in the piston transfer channel control cabinet to realize the linkage control between the detection unit and the positioning unit. After the positioning of the piston workpiece on the carrier substrate is completed, the magnetic sensor of the positioning unit generates an induction signal and feeds it back to the PLC. The PLC control and the detection cylinder The connected solenoid valve is opened to detect the movement of the cylinder, and the probe is driven forward and inserted into the last oil hole opened on one side of the piston workpiece to be detected.
[0029] Step d: The PLC in the control cabinet of the piston transfer channel analyzes the detection information and processes it. If the detected piston oil hole is well drilled, that is, the magnetic sensor of the detection unit senses the magnetic coil in the cylinder and outputs an induction signal, and the induction signal generated by the front photoelectric switch 13 at the front end of the piston transfer channel At the same time, it is transmitted to the PLC of the piston transfer channel platform to move the platform from the front end of the station to the back end B of the station. At the same time, the solenoid valve of the detection unit is controlled to be closed, and the detection cylinder drives the probe to return to the initial position; After the front end of the station reaches the rear end of the station, the rear photoelectric switch 14 at the rear end of the station detects that the piston outputs a signal to the PLC of the piston transfer channel platform, and the solenoid valve of the control positioning unit is turned off and closed, and the positioning cylinder drives the second positioning The block is returned to the initial position, and the manipulator takes the piston to the operating platform of the next process of the piston production line. If the detection unit detects that the piston oil hole is unqualified, that is, the magnetic sensor of the detection unit has no induction signal generated, the PLC does not issue any command action, the positioning unit, the second positioning block of the detection unit, and the probe remain extended, and the piston runs on the forehearth. The piston workpiece stays at the front end of the piston transfer channel and waits for the staff to handle it. In addition, in the case of detecting the unqualified piston oil hole, it can also trigger the alarm mechanism of the unqualified piston oil hole detection set by the PLC. When an alarm occurs, it effectively reminds the staff to check and deal with it in time. In the following, a specific embodiment of the present invention is used to further describe and illustrate the present invention.
[0030] The invention is specifically applied in the oil hole process of the piston automatic processing production line. In such image 3 In the illustrated embodiment of the present invention, the outer diameter of the piston is φ90mm, the diameter of the oil hole during machining is φ4mm, and the probe diameter is φ3.5mm. When the piston transfer channel platform is at the front end A of the station, the robot puts the piston workpiece processed in the previous process on the bearing substrate of the piston workpiece channel transfer platform, and the photoelectric switch senses the piston workpiece placed on the bearing substrate. The signal is fed back to the piston transfer material passage control cabinet PLC. The PLC controls the solenoid valve connected with the positioning cylinder to open, and the positioning cylinder acts and drives the second positioning block to push forward, and clamps the piston workpiece to the first positioning block and In the space enclosed by the second positioning block, after the positioning of the piston workpiece on the carrier substrate is completed, the magnetic sensor of the positioning unit generates an induction signal and feeds it back to the PLC. The PLC controls the solenoid valve connected to the detection cylinder to open and detect the cylinder movement , Drive the probe forward and insert it into the last oil hole on one side of the piston workpiece to be detected. If the detected piston oil hole is qualified, the magnetic sensor of the detection unit senses the magnetic coil in the detection cylinder and outputs The sensor signal is transmitted to the PLC of the piston transfer channel platform together with the signal of the front photoelectric switch at the front end of the station, so that the platform moves from the front end of the station A to the back end point B of the station, and the solenoid valve of the detection unit is controlled to be broken Electrically closed, the detection cylinder drives the probe back to the initial position; after the piston reaches the rear end B of the station from the front end A of the station, the rear photoelectric switch at the rear end of the station detects the piston output signal to the PLC of the piston transfer channel platform , The solenoid valve of the control positioning unit is powered off and closed, the positioning cylinder drives the second positioning block to return to the initial position, and the manipulator takes the piston to the operating platform of the next process. If the detection unit detects that the piston oil hole is unqualified, that is, the magnetic sensor does not generate an induction signal, the PLC does not issue any command action, the positioning unit, the second positioning block of the detection unit, and the probe remain extended, and the piston moves the piston workpiece on the forehearth Stay at the front end of the piston transfer channel and wait for the staff to deal with it. In addition, when the piston oil hole is detected as unqualified, you can also trigger the alarm mechanism set by the PLC to detect the unqualified piston oil hole, and an alarm will occur. , So as to effectively remind the staff to check and deal with it in time.
