Symmetrical part edge detection device and method based on air pressure detection

Abstract

The application relates to the technical field of detection equipment, in particular to a symmetry part edge detection equipment and method based on air pressure detection, which comprises a platform substrate, an air cylinder arranged above the platform substrate, a detected hole penetratingly arranged on a part and a detection air nozzle, the detection air nozzle is controlled to ascend and descend through the air cylinder; the part is positioned and placed on the platform substrate, the detection air nozzle corresponds to the detected hole up and down when the part is installed in a normal direction; the symmetry part edge detection equipment based on air pressure detection can detect the edge reverse problem of the symmetry part which is prone to occur in the assembly process, avoids the misjudgment risk of manual visual inspection, can realize batch synchronous detection, and improves the detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, specifically to a device and method for edge detection of symmetrical parts based on air pressure detection. Background Technology

[0002] In fields such as mechanical assembly and product manufacturing, due to the geometric symmetry of parts (such as left-right symmetry, central symmetry, etc.), misjudgment of orientation during assembly can easily lead to incorrect installation of parts, affecting product function, appearance, or performance. This is especially true for symmetrical workpieces like air duct panels, where reverse orientation issues are common. Two parts that should be installed symmetrically (such as left and right parts) are incorrectly installed in the same direction. The later the problem is discovered, the higher the cost of rework, disassembly, and replacement, impacting production efficiency. Currently, most small and medium-sized enterprises rely on manual visual inspection for judgment, which is not only inefficient but also carries the risk of misjudgment. Summary of the Invention

[0003] The purpose of this invention is to provide a device and method for edge detection of symmetrical parts based on air pressure detection, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a symmetrical part edge detection device based on air pressure detection, comprising a platform base plate, a cylinder disposed above the platform base plate, a detection hole through the part, and a detection nozzle, wherein the detection nozzle is controlled to be raised and lowered by the cylinder;

[0005] The part is positioned on the platform base plate. When the part is installed in the correct orientation, the detection nozzle is vertically aligned with the hole to be detected. When the part is installed in the reverse orientation, the detection nozzle is vertically misaligned with the hole to be detected. The detection nozzle is moved downward by a cylinder, and then air is ejected through the detection nozzle to determine whether a clear air path is formed in the hole to determine whether the part is installed in the correct orientation.

[0006] The lower part of the platform substrate is fixedly provided with a central control motherboard and a central control accessory board. The central control motherboard has a pressure equalization cavity and the central control accessory board has a main flow channel.

[0007] An electromagnetic valve is provided between the main flow channel and the equalizing chamber. The electromagnetic valve controls the opening and closing of the main flow channel. The other end of the main flow channel is connected to the detection nozzle through a pipe. When the electromagnetic valve is opened, the pressurized gas in the equalizing chamber enters the detection nozzle through the main flow channel.

[0008] The central control panel is equipped with a blockage detection structure. When the solenoid valve is open, the blockage detection structure can detect when the detection nozzle is blocked.

[0009] The blocking detection structure includes a branch flow channel, a pressure sensing chamber, an intermediate chamber, and a pressure applying chamber. The branch flow channel, pressure sensing chamber, intermediate chamber, and pressure applying chamber are all located inside the central control panel and are connected end to end in sequence.

[0010] The branch flow channel is connected to the main flow channel, and the external connection of the pressure chamber is provided with a docking tube. The docking tube is airtightly inserted into the central control board and is connected to the pressure equalization chamber.

[0011] The pressure-sensing chamber is airtightly connected to a pressure-sensing plug, and the pressure-applying chamber is airtightly connected to a pressure-applying plug. The diameter of the pressure-sensing plug is larger than that of the pressure-applying plug, resulting in a larger pressure-receiving area for the pressure-sensing plug. A synchronous coupling is fixedly connected between the pressure-sensing plug and the pressure-applying plug.

[0012] A loop contact plate is fixedly installed on the synchronous coupling, and a pin insert is embedded in the side wall of the intermediate cavity. At least two sets of contact springs are provided on the pin insert.

[0013] When the synchronous coupling moves axially in the direction of the pressure plate, the circuit contact plate will contact the contact spring, and the circuit contact plate will form a circuit with the contact spring, thereby detecting the movement of the synchronous coupling.

[0014] The control panel has a transverse groove that cuts off the main channel. A self-test slide plate is installed in the transverse groove. The transverse groove and the self-test slide plate are in sealed contact. The self-test slide plate has a normally open hole through which the main channel is ventilated. When the self-test slide plate moves, the normally open hole will be misaligned with the main channel, thus sealing the main channel.

[0015] The central control motherboard has a stabilizing cavity inside. One end of the stabilizing cavity is connected to the pressure equalization cavity. The other end of the stabilizing cavity is fixedly provided with an end support. A high-pressure pipe is fixedly provided on the end support. A T-shaped air passage is provided inside the end support. The high-pressure pipe and the T-shaped air passage are connected to each other.

[0016] The high-pressure pipe has a high-pressure piston in a sealed contact with the inside. A connecting shaft is fixedly installed on one side of the high-pressure piston, and a stabilizing plug is fixedly installed at the end of the connecting shaft. The stabilizing plug and the stabilizing cavity are in sliding sealed contact.

[0017] A stabilizing spring is provided on the side of the stabilizing plug facing the end support. An air storage tank is fixedly installed on the outside of the central control main board. A one-way air supply valve is provided between the T-shaped air passage and the air storage tank. The one-way air supply valve allows the gas in the T-shaped air passage to flow unidirectionally into the air storage tank.

[0018] A one-way air intake valve is installed between the T-shaped air passage and the outside atmosphere, allowing the outside atmosphere to flow unidirectionally into the T-shaped air passage.

[0019] A gas tank end seat is fixedly installed on the gas storage tank. A pressure relief hole is opened in the gas tank end seat. A sealing shaft is inserted into the pressure relief hole, and the pressure relief hole and the sealing shaft are in airtight contact.

[0020] One end of the pressure relief socket is connected to the inside of the gas storage tank. When the gas storage tank is filled with positive pressure gas, the gas will exert pressure on the end of the sealing plug shaft.

[0021] The end of the pressure relief port is chamfered, and a vertical through hole is provided at the chamfer. The other end of the vertical through hole is connected to the gas storage tank.

[0022] A lateral locking shaft is inserted into the vertical through hole, and there is an airtight contact between the lateral locking shaft and the vertical through hole. A locking shaft spring is provided at the end of the lateral locking shaft, and the locking shaft spring applies an elastic pulling force to the lateral locking shaft to move it into the gas storage tank.

[0023] When there is positive pressure gas in the gas storage tank exceeding a certain pressure threshold, the gas pressure will push the lateral locking shaft to move against the elastic force of the locking shaft spring, so that the lateral locking shaft has an elastic movement tendency to squeeze and contact the outer surface of the sealing plug shaft.

[0024] A synchronization backplate is fixedly installed at the end of the sealing plug shaft. The synchronization backplate is fixedly installed with the self-test slide plate. A magnetic suction plate is fixedly installed on the synchronization backplate. A permanent magnet is fixedly installed on the central control plate. The permanent magnet and the magnetic suction plate magnetically attract each other, so that the sealing plug shaft has a tendency to move towards the inside of the pressure relief plug hole.

[0025] A detection method for symmetrical parts based on air pressure detection, comprising the following steps:

[0026] Step 1: Position the assembled parts on the platform base plate;

[0027] Step two: The detection nozzle is moved downwards by controlling the cylinder;

[0028] Step 3: After the detection nozzle moves down to the correct position, control the detection nozzle to spray air. When the detection nozzle sprays air smoothly, the position of the detection nozzle and the hole being detected corresponds vertically, and the part is installed in the correct orientation.

[0029] When the testing nozzle is blocked, the position of the testing nozzle and the tested hole is misaligned, and the parts are installed in reverse.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] This invention relates to a symmetrical part edge detection device based on air pressure detection. It can detect the problem of reverse edge detection that easily occurs in symmetrical parts during assembly, avoiding the risk of misjudgment by manual visual inspection. At the same time, it can realize batch synchronous detection and improve detection efficiency.

[0032] This invention, through the coordinated structure of a central control motherboard and a central control distribution board, can control the detection nozzle and perform detection and judgment when the detection nozzle is blocked. Compared with the traditional method of directly setting a pressure sensor, it can achieve triggering when the air source pressure is low, avoiding the situation where the detection signal cannot be triggered when the air source pressure is lower than the sensor's set threshold.

[0033] This invention, through the combination of a transverse groove, a self-testing slide plate, and a normally open hole, enables the sealing detection structure to perform self-testing and can promptly detect when the sealing detection structure is stuck.

[0034] By combining the stabilizing chamber, the gas tank, and the sealing shaft, the pressure in the equalizing chamber can be stabilized and controlled. At the same time, the pressure changes in the equalizing chamber can be used to accumulate time. When the usage time exceeds a certain period, the self-test slide can be controlled and driven, thus realizing self-test timing and driving. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0036] Figure 2 This is another schematic diagram of the overall structure of the present invention.

[0037] Figure 3 This is a schematic diagram of the air nozzle detection device of the present invention.

[0038] Figure 4 This is a schematic diagram of the central control motherboard and central control circuit board structure of the present invention.

[0039] Figure 5 This is a schematic diagram of the central control motherboard and central control accessory board from another angle.

[0040] Figure 6 This is a half-sectional schematic diagram of the central control motherboard and central control accessory board of the present invention.

[0041] Figure 7 This is a partial half-sectional top view of the central control motherboard and central control distribution board of the present invention.

[0042] Figure 8 This is a vertical half-sectional view of the synchronous coupling of the present invention.

[0043] Figure 9 This is a structural diagram of the self-testing slide plate of the present invention.

[0044] In the diagram: 1. Platform base plate; 2. Cylinder; 3. Detected hole; 4. Detection nozzle; 5. Centralized control main board; 6. Centralized control distribution board; 7. Pressure equalization chamber; 8. Main flow channel; 9. Solenoid valve; 801. Branch flow channel; 802. Pressure sensing chamber; 803. Intermediate chamber; 804. Pressure application chamber; 805. Connecting tube; 806. Pressure sensing plug; 807. Pressure application plug; 808. Synchronous coupling; 809. Circuit contact plate; 810. Pin insert; 811. Contact spring; 601. Transverse groove; 602. Self-test slide plate; 603. Normally open hole; 701. Stabilizing chamber; 702. End support; 703. High-pressure pipe; 704. 705. T-type air passage; 706. High-pressure piston; 707. Connecting shaft; 708. Stabilizing plug disc; 709. Air tank; 710. One-way air supply valve; 711. One-way air intake valve; 712. Air tank end seat; 713. Pressure relief socket; 714. Sealing plug shaft; 715. Side locking shaft; 716. Locking shaft spring; 717. Synchronization backplate; 718. Magnetic suction plate; 720. Permanent magnet; 720. Stabilizing spring; 10. Parts; 101. Positioning pin; 102. Adjusting track; 103. Track slide; 104. Cylinder bracket; 401. Rubber ring; 719. Air source input screw hole; 812. Central control output screw hole. Detailed Implementation

[0045] 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.

[0046] Please see Figures 1 to 9 This invention provides a technical solution: a symmetrical part edge detection device based on air pressure detection, comprising a platform base plate 1, a cylinder 2 disposed above the platform base plate 1, a detection hole 3 penetrating the part, and a detection nozzle 4. The detection nozzle 4 is raised and lowered by the cylinder 2. The detection nozzle 4 is as follows... Figure 3 As shown, the detection nozzle 4 is a tubular structure with an opening at the bottom and a side opening at the top. Air is supplied to the detection nozzle 4 through the side opening at the top, causing the lower part of the detection nozzle 4 to spray air outward. The upper end of the detection nozzle 4 is fixedly installed on the telescopic shaft of the cylinder 2.

[0047] The part is positioned on the platform base plate 1. When the part is installed in the forward direction, the detection nozzle 4 is vertically aligned with the detection hole 3. When the part is installed in the reverse direction, the detection nozzle 4 is vertically misaligned with the detection hole 3. The cylinder 2 controls the detection nozzle 4 to move downward, and then the detection nozzle 4 sprays air to determine whether the detection hole 3 forms a smooth air passage, so as to determine whether the part is installed in the forward direction.

[0048] A central control motherboard 5 and a central control accessory board 6 are fixedly mounted on the lower part of the platform substrate 1. The central control motherboard 5 has a pressure equalization chamber 7, and only one set of pressure equalization chambers 7 is provided. The central control accessory board 6 has a main flow channel 8. Figure 6 As shown, the main flow channel 8 is provided with several groups, each corresponding to a detection nozzle 4. An electromagnetic valve 9 is installed between the main flow channel 8 and the equalizing chamber 7, controlling its on / off state. The other end of the main flow channel 8 is connected to the detection nozzle 4 via a pipe. When the electromagnetic valve 9 is open, the pressurized gas in the equalizing chamber 7 enters the detection nozzle 4 through the main flow channel 8. A blockage detection structure is provided in the central control panel 6. When the electromagnetic valve 9 is open, the blockage of the detection nozzle 4 can be detected by the blockage detection structure. The blockage detection structure includes a branch flow channel 801, a pressure sensing chamber 802, an intermediate chamber 803, and a pressure applying chamber 804. These components are all located inside the central control panel 6 and are connected sequentially end-to-end.

[0049] Branch channel 801 is connected to main channel 8. A docking tube 805 is externally connected to pressure chamber 804. The docking tube 805 is airtightly inserted into the central control board 5 and communicates with pressure equalization chamber 7. A pressure-sensing plug 806 is airtightly contacted in pressure-sensing chamber 802, and a pressure-applying plug 807 is airtightly contacted in pressure chamber 804. The diameter of pressure-sensing plug 806 is larger than the diameter of pressure-applying plug 807, resulting in a larger pressure-receiving area. A synchronous coupling 808 is fixedly connected between pressure-sensing plug 806 and pressure-applying plug 807.

[0050] A loop contact plate 809 is fixedly installed on the synchronous coupling 808, and a pin insert 810 is embedded in the side wall of the intermediate cavity 803. At least two sets of contact springs 811 are provided on the pin insert 810. The external circuit monitors and judges in real time whether the contact springs 811 form a loop through the pin insert 810.

[0051] When the synchronous coupling 808 moves axially in the direction of the pressure plate 807, the circuit contact plate 809 will contact the contact spring 811, and the circuit contact plate 809 will make the contact spring 811 form a circuit, thereby detecting the movement of the synchronous coupling 808.

[0052] The central control panel 6 has a transverse groove 601 that cuts off the main channel 8. A self-test slide plate 602 is installed in the transverse groove 601. The transverse groove 601 and the self-test slide plate 602 are in sealed contact. The self-test slide plate 602 has a normally open hole 603. The main channel 8 is ventilated through the normally open hole 603. When the self-test slide plate 602 moves, the normally open hole 603 will be misaligned with the main channel 8, thus sealing the main channel 8.

[0053] The central control motherboard 5 has a stabilizing cavity 701 inside. One end of the stabilizing cavity 701 is connected to the pressure equalization cavity 7. The other end of the stabilizing cavity 701 is fixedly provided with an end support 702. A high-pressure pipe 703 is fixedly provided on the end support 702. A T-shaped air passage 704 is provided inside the end support 702. The high-pressure pipe 703 and the T-shaped air passage 704 are connected to each other.

[0054] The high-pressure pipe 703 has a high-pressure piston 705 in an internal sealing contact. A connecting shaft 706 is fixedly installed on one side of the high-pressure piston 705. A stabilizing plug 707 is fixedly installed at the end of the connecting shaft 706. The stabilizing plug 707 and the stabilizing cavity 701 are in sliding sealing contact.

[0055] A stabilizing spring 720 is provided on the side of the stabilizing disc 707 facing the end support 702. An air storage tank 708 is fixedly installed on the outside of the central control main board 5. A one-way air supply valve 709 is provided between the T-shaped air passage 704 and the air storage tank 708, which allows the gas in the T-shaped air passage 704 to flow unidirectionally into the air storage tank 708. A one-way air inlet valve 710 is provided to connect the T-shaped air passage 704 with the outside atmosphere, which allows the outside atmosphere to flow unidirectionally into the T-shaped air passage 704.

[0056] A gas tank end seat 711 is fixedly installed on the gas tank 708. A pressure relief hole 712 is opened in the gas tank end seat 711. A sealing shaft 713 is inserted into the pressure relief hole 712, and the pressure relief hole 712 and the sealing shaft 713 are in airtight contact. One end of the pressure relief hole 712 is connected to the interior of the gas tank 708. When positive pressure gas is filled into the gas tank 708, the gas will apply pressure to the end of the sealing shaft 713.

[0057] The end of the pressure relief port 712 is chamfered, and a vertical through hole is formed at the chamfer. The other end of the vertical through hole is connected to the gas storage tank 708. A lateral locking shaft 714 is inserted into the vertical through hole, and there is an airtight contact between the lateral locking shaft 714 and the vertical through hole. A locking shaft spring 715 is provided at the end of the lateral locking shaft 714. The locking shaft spring 715 applies an elastic pulling force to the lateral locking shaft 714 to move towards the inside of the gas storage tank 708. When there is positive pressure gas in the gas storage tank 708 exceeding a certain pressure threshold, the gas pressure will push the lateral locking shaft 714 to move against the elastic force of the locking shaft spring 715, so that the lateral locking shaft 714 has an elastic movement tendency to squeeze and contact the outer surface of the sealing port 713.

[0058] A synchronization backplate 716 is fixedly installed at the end of the sealing plug shaft 713. The synchronization backplate 716 is fixedly installed with the self-test slide plate 602. A magnetic suction plate 717 is fixedly installed on the synchronization backplate 716. A permanent magnet 718 is fixedly installed on the central control board 6. The permanent magnet 718 and the magnetic suction plate 717 magnetically attract each other, so that the sealing plug shaft 713 has a tendency to move towards the inside of the pressure relief plug hole 712.

[0059] A detection method for symmetrical parts based on air pressure detection, comprising the following steps:

[0060] Step 1: Position the assembled parts on the platform base plate 1;

[0061] Step 2: Control the downward movement of the detection nozzle 4 via cylinder 2;

[0062] Step 3: After the detection nozzle 4 moves down to the position, control the detection nozzle 4 to spray air. When the detection nozzle 4 sprays air smoothly, the position of the detection nozzle 4 and the detection hole 3 are vertically aligned, and the part is installed in the correct orientation.

[0063] When the detection nozzle 4 is blocked, the position of the detection nozzle 4 and the detection hole 3 is misaligned vertically, and the parts are installed in reverse.

[0064] like Figure 1 As shown, the part product 10 is placed above the platform substrate 1 for testing. A positioning pin 101 is inserted and installed on the upper surface of the platform substrate 1. The positioning pin 101 is used to position and limit the part product 10 so as to determine the position of the part product 10 when it is placed.

[0065] like Figure 1 As shown, an adjustment rail 102 is fixedly mounted on the upper part of the platform base plate 1, and a rail slide block 103 is slidably mounted on the upper part of the adjustment rail 102. The rail slide block 103 has a locking function and can lock its position relative to the adjustment rail 102. A cylinder bracket 104 is fixedly mounted on the rail slide block 103, and the cylinder 2 is mounted on the cylinder bracket 104.

[0066] like Figure 3 As shown, a rubber ring 401 is fixedly installed at the lower part of the detection nozzle 4, and the detection nozzle 4 is in sealed contact with the surface of the part product 10 through the rubber ring 401.

[0067] like Figure 6 As shown, a gas source inlet screw hole 719 is provided on one side of the equalizing chamber 7, and the equalizing chamber 7 is connected to an external gas source through the gas source inlet screw hole 719. A central control output screw hole 812 is provided at the end of the main channel 8, and the pipeline is installed through the central control output screw hole 812, so that the main channel 8 is connected to the detection nozzle 4 in a one-to-one correspondence.

[0068] The present invention performs detection through the detection hole 3 opened on the part product 10. The detection hole 3 adopts an asymmetrical design, so that when the part product 10 is installed in the correct direction, the detection nozzle 4 can move down to form a smooth air passage through the detection hole 3. Conversely, the lower part of the detection nozzle 4 is blocked by the upper surface of the part product 10.

[0069] like Figure 6 and Figure 7 As shown, the air source is connected to the inside of the equalizing chamber 7 through the air source input screw hole 719, so that the inside of the equalizing chamber 7 is in a positive pressure state. The air pressure is applied to the pressure plate 807 through the docking tube 805. At this time, the circuit contact plate 809 and the contact spring 811 are in a separated state.

[0070] When it is necessary to detect the gas ejection from nozzle 4, the solenoid valve 9 is opened, and the positive pressure gas in the equalizing chamber 7 enters the main flow channel 8 through the solenoid valve 9. It is then input into the detection nozzle 4 through the central control output screw hole 812. If a clear air path is formed below the detection nozzle 4, the gas is directly ejected into the outside atmosphere through the nozzle 4. Because the main flow channel 8 is connected to the outside atmosphere through the detection nozzle 4, the gas pressure in the main flow channel 8 will be extremely low, far lower than the gas pressure in the equalizing chamber 7. Figure 7 As shown, the main flow channel 8 is connected to the pressure sensing chamber 802 through the branch flow channel 801, and the equalizing chamber 7 is connected to the pressure applying chamber 804 through the docking tube 805. At this time, the gas pressure acting on the pressure sensing plug 806 is much less than the gas pressure on the pressure applying plug 807, and the circuit contact plate 809 does not move.

[0071] When the detection nozzle 4 is misaligned with the detection hole 3, forming a blockage, the gas in the main flow channel 8 cannot be discharged to the outside atmosphere through the detection nozzle 4. At this time, the equalizing chamber 7 forms a stable gas connection circuit with the pressure sensing chamber 802 through the main flow channel 8 and the branch flow channel 801. The gas pressure acting on the pressure sensing plate 806 is the same as the gas pressure acting on the pressure applying plate 807. According to the pressure formula, under a constant gas pressure, the force generated is proportional to the area. Since the diameter of the pressure sensing plate 806 is large... The pressure-applying stopper 807 and the pressure-sensing stopper 806 have a larger area. Under unbalanced forces, the drive circuit contact plate 809 moves toward the contact spring 811, causing the circuit contact plate 809 and the contact spring 811 to contact and form a circuit. The pin insert 810 detects that the circuit of the contact spring 811 is closed, and thus knows the movement state of the circuit contact plate 809. This allows it to determine that the detection nozzle 4 is blocked and misaligned with the detection hole 3, and the part product 10 is installed in reverse, triggering an audible and visual alarm.

[0072] In the above process, when a blockage forms below the detection nozzle 4, this invention achieves an imbalance of forces on the pressure-sensing plate 806 and the pressure-applying plate 807 by utilizing the area difference under the same air pressure. This allows it to adapt to lower air pressure conditions. The difference in force imbalance only needs to overcome the piston friction of the pressure-sensing plate 806 and the pressure-applying plate 807. Ensuring that the working friction of the pressure-sensing plate 806 and the pressure-applying plate 807 is sufficiently small ensures triggering even at extremely low air pressures. Compared to the traditional method of directly setting a fixed trigger threshold for the air pressure sensor, this avoids the situation where triggering is difficult when the air source pressure is below the threshold. If the threshold is set too low, when the air source pressure is high, a certain proportion of positive pressure will still exist in the main flow channel 8 even when the lower part of the detection nozzle 4 is unobstructed, which can easily lead to false triggering.

[0073] When the solenoid valve 9 is open and closed, the air pressure in the equalizing chamber 7 will fluctuate significantly. When the gas in the equalizing chamber 7 suddenly flows out through the solenoid valve 9, such as... Figure 7 As shown, the stabilizing plug 707 is driven to the right by the elastic force of the stabilizing spring 720, so that the gas in the stabilizing cavity 701 enters the equalizing cavity 7. When a large amount of gas suddenly flows into the equalizing cavity 7, causing the gas pressure to rise, the stabilizing plug 707 can elastically move to the left to accommodate it, thereby achieving a certain degree of pressure stabilization effect.

[0074] During the aforementioned pressure stabilization process, the stabilizing disc 707 reciprocates, driving the high-pressure piston 705 to reciprocate. The high-pressure piston 705 and the high-pressure pipe 703 work together to form a pump structure. Combined with the one-way inlet valve 710 and the one-way outlet valve 709, this structure can draw in external air pressure and pump it into the air storage tank 708. Figure 7 As shown, the piston area of ​​the stabilizing disc 707 is much larger than that of the high-pressure piston 705, which can proportionally enhance the pumping pressure of the high-pressure piston 705.

[0075] As usage time increases, the gas pressure in the gas storage tank 708 gradually increases. The gas pressure in the gas storage tank 708 acts on the end face of the sealing shaft 713. At this time, the sealing shaft 713 is locked in position by the magnetic attraction between the magnetic plate 717 and the permanent magnet 718, and the magnetic plate 717 and the permanent magnet 718 are in direct contact. At this time, the magnetic attraction is at its maximum. Once the gas pressure in the gas storage tank 708 can push the sealing shaft 713 to move to the left, the magnetic plate 717 and the permanent magnet 718 will begin to separate. As the distance between the magnetic plate 717 and the permanent magnet 718 increases, the magnetic attraction decreases significantly. This allows the sealing shaft 713 to move to the left directly and significantly once it moves to the left under the drive of gas pressure. Because the lateral locking shaft 714 has a tendency to extend under the gas pressure in the gas storage tank 708, when the leftward end of the sealing shaft 713 passes the lateral locking shaft 714, the lateral locking shaft 714 will extend into the pressure relief port 712, preventing the sealing shaft 713 from resetting. At this time, the gas in the gas storage tank 708 will be continuously discharged to the outside through the pressure relief port 712.

[0076] Meanwhile, due to the leftward movement of the sealing shaft 713, the synchronous backplate 716, and the self-test slide plate 602, the normally open hole 603 and the main channel 8 will be misaligned, sealing the end of the main channel 8. At this time, the main channel 8 is no longer connected to the detection nozzle 4, and the control solenoid valve 9 is opened. Similarly, the equalizing chamber 7 is directly and stably connected to the pressure sensing chamber 802 through the main channel 8. The device performs periodic self-tests according to the usage time, and can detect in time when there is a jamming problem in the sealing detection structure.

[0077] When the gas pressure in the gas storage tank 708 is discharged to a certain threshold, the pressure exerted by the gas pressure in the gas storage tank 708 on the end face of the lateral locking shaft 714 is less than the elastic tension of the locking shaft spring 715, causing the lateral locking shaft 714 to reset and move under the elastic tension of the locking shaft spring 715. At this time, the lateral locking shaft 714 is pulled out from the pressure relief socket 712 and no longer blocks the sealing socket 713. Under the magnetic attraction between the magnetic suction plate 717 and the permanent magnet 718, the sealing socket 713 is reinserted and locked into the pressure relief socket 712, realizing the automatic reset of the device.

[0078] 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 symmetrical part edge inspection device based on air pressure detection, comprising a platform base plate, a cylinder disposed above the platform base plate, a through-hole to be inspected in the part, and an inspection nozzle, characterized in that: The detection nozzle is raised and lowered by a cylinder. The part is positioned on the platform base plate. When the part is installed in the correct orientation, the detection nozzle is vertically aligned with the hole to be detected. When the part is installed in the reverse orientation, the detection nozzle is vertically misaligned with the hole to be detected. The detection nozzle is moved down by a cylinder, and then air is sprayed through the detection nozzle to determine whether a smooth air passage is formed in the hole to determine whether the part is installed in the correct orientation. A central control main board and a central control accessory board are fixedly mounted on the lower part of the platform base plate. The central control main board has a pressure equalization chamber, and the central control accessory board has a main flow channel. A blockage detection structure is also provided in the central control accessory board. The blockage detection structure includes a branch flow channel, a pressure sensing chamber, an intermediate chamber, and a pressure applying chamber. These components are all located inside the central control accessory board and are sequentially connected end-to-end. The branch flow channel is connected to the main flow channel. A docking tube is externally connected to the pressure applying chamber. This docking tube is airtightly inserted into the central control main board and communicates with the pressure equalization chamber. A pressure sensing device is airtightly contacted within the pressure sensing chamber. A pressure-applying plate is airtightly disposed in the pressure-applying chamber. The diameter of the pressure-sensing plate is larger than that of the pressure-applying plate, resulting in a larger pressure-receiving area. A synchronous coupling is fixedly connected between the pressure-sensing plate and the pressure-applying plate. A return contact plate is fixedly disposed on the synchronous coupling. A pin insert is embedded in the side wall of the intermediate cavity, and at least two sets of contact springs are disposed on the pin insert. When the synchronous coupling moves axially in the direction of the pressure-applying plate, the return contact plate will contact the contact springs, forming a circuit through the return contact plate, thereby detecting the movement of the synchronous coupling.

2. The edge detection device for symmetrical parts based on air pressure detection according to claim 1, characterized in that: An electromagnetic valve is provided between the main flow channel and the equalizing chamber. The electromagnetic valve controls the opening and closing of the main flow channel. The other end of the main flow channel is connected to the detection nozzle through a pipe. When the electromagnetic valve is opened, the pressurized gas in the equalizing chamber enters the detection nozzle through the main flow channel. When the solenoid valve is open, the blockage detection structure can detect when the detection nozzle is blocked.

3. The edge detection device for symmetrical parts based on air pressure detection according to claim 1, characterized in that: The control panel has a transverse groove that cuts off the main channel. A self-test slide plate is installed in the transverse groove. The transverse groove and the self-test slide plate are in sealed contact. The self-test slide plate has a normally open hole through which the main channel is ventilated. When the self-test slide plate moves, the normally open hole will be misaligned with the main channel, thus sealing the main channel.

4. The edge detection device for symmetrical parts based on air pressure detection according to claim 3, characterized in that: The central control motherboard has a stabilizing cavity inside. One end of the stabilizing cavity is connected to the pressure equalization cavity. The other end of the stabilizing cavity is fixedly provided with an end support. A high-pressure pipe is fixedly provided on the end support. A T-shaped air passage is provided inside the end support. The high-pressure pipe and the T-shaped air passage are connected to each other.

5. The edge detection device for symmetrical parts based on air pressure detection according to claim 4, characterized in that: The high-pressure pipe has a high-pressure piston in a sealed contact with the inside. A connecting shaft is fixedly installed on one side of the high-pressure piston, and a stabilizing plug is fixedly installed at the end of the connecting shaft. The stabilizing plug and the stabilizing cavity are in sliding sealed contact.

6. The edge detection device for symmetrical parts based on air pressure detection according to claim 5, characterized in that: A stabilizing spring is provided on the side of the stabilizing plug facing the end support. An air storage tank is fixedly installed on the outside of the central control main board. A one-way air supply valve is provided between the T-shaped air passage and the air storage tank. The one-way air supply valve allows the gas in the T-shaped air passage to flow unidirectionally into the air storage tank. A one-way air intake valve is installed between the T-shaped air passage and the outside atmosphere, allowing the outside atmosphere to flow unidirectionally into the T-shaped air passage.

7. The edge detection device for symmetrical parts based on air pressure detection according to claim 6, characterized in that: A gas tank end seat is fixedly installed on the gas storage tank. A pressure relief hole is opened in the gas tank end seat. A sealing shaft is inserted into the pressure relief hole, and the pressure relief hole and the sealing shaft are in airtight contact. One end of the pressure relief socket is connected to the inside of the gas storage tank. When the gas storage tank is filled with positive pressure gas, the gas will exert pressure on the end of the sealing plug shaft.

8. The edge detection device for symmetrical parts based on air pressure detection according to claim 7, characterized in that: The end of the pressure relief port is chamfered, and a vertical through hole is provided at the chamfer. The other end of the vertical through hole is connected to the gas storage tank. A lateral locking shaft is inserted into the vertical through hole, and there is an airtight contact between the lateral locking shaft and the vertical through hole. A locking shaft spring is provided at the end of the lateral locking shaft, and the locking shaft spring applies an elastic pulling force to the lateral locking shaft to move it into the gas storage tank. When there is positive pressure gas in the gas storage tank exceeding a certain pressure threshold, the gas pressure will push the lateral locking shaft to move against the elastic force of the locking shaft spring, so that the lateral locking shaft has an elastic movement tendency to squeeze and contact the outer surface of the sealing plug shaft.

9. The edge detection device for symmetrical parts based on air pressure detection according to claim 8, characterized in that: A synchronization backplate is fixedly installed at the end of the sealing plug shaft. The synchronization backplate is fixedly installed with the self-test slide plate. A magnetic suction plate is fixedly installed on the synchronization backplate. A permanent magnet is fixedly installed on the central control plate. The permanent magnet and the magnetic suction plate magnetically attract each other, so that the sealing plug shaft has a tendency to move towards the inside of the pressure relief plug hole.

10. The detection method of the edge detection device for symmetrical parts based on air pressure detection according to any one of claims 1-9, characterized in that, The method includes the following steps: Step 1: Position the assembled parts on the platform base plate; Step two: The detection nozzle is moved downwards by controlling the cylinder; Step 3: After the detection nozzle moves down to the correct position, control the detection nozzle to spray air. When the detection nozzle sprays air smoothly, the position of the detection nozzle and the hole being detected corresponds vertically, and the part is installed in the correct orientation. When the testing nozzle is blocked, the position of the testing nozzle and the tested hole is misaligned, and the parts are installed in reverse.

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