Symmetrical part edge-following detection equipment and method based on air pressure detection

Abstract

The invention relates to the technical field of detection equipment, in particular to symmetrical part edge-following detection equipment and method based on air pressure detection, the symmetrical part edge-following detection equipment comprises a platform base plate, an air cylinder arranged above the platform base plate, a detected hole formed in a part in a penetrating mode and a detection air tap, and the detection air tap is controlled to ascend and descend through the air cylinder; a part is positioned and placed on the platform substrate, and when the part is installed in the forward direction, the detection air tap corresponds to a detected hole up and down; according to the symmetrical part edge-following detection equipment based on air pressure detection, the edge-following and reverse problems easily occurring in the assembling process of symmetrical parts can be detected, the risk of misjudgment caused by manual visual judgment is avoided, meanwhile, batch synchronous detection can be achieved, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and in particular to a device and method for detecting the along-edge of symmetrical parts based on air pressure detection. Background Art

[0002] In fields such as mechanical assembly and product manufacturing, due to the geometric symmetry of parts (such as bilateral symmetry or central symmetry), it is easy to misjudge the direction during the assembly process, resulting in the incorrect installation of parts, which in turn affects the product's function, appearance, or performance. This is especially true for symmetrical workpieces such as air duct panels, which are prone to side-to-side reversal issues. Two parts that should be installed symmetrically (such as the 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 of parts, which affects production efficiency. In the current context, most small and medium-sized enterprises use manual visual inspection for inspection and judgment, which is not only inefficient but also carries the risk of misjudgment. Summary of the Invention

[0003] The purpose of the present invention is to provide a device and method for detecting the along-edge of symmetrical parts based on air pressure detection, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a device for detecting symmetrical parts along their edges based on air pressure detection, comprising a platform base, a cylinder disposed above the platform base, a hole to be detected that is formed through the part, and a detection air nozzle, wherein the detection air nozzle is raised and lowered by the cylinder;

[0005] The parts are positioned and placed on the platform baseplate. When the parts are installed in the forward direction, the detection air nozzle corresponds to the detected hole up and down; when the parts are installed in the reverse direction, the detection air nozzle and the detected hole are misaligned up and down. The detection air nozzle is controlled by the cylinder to move downward, and then the detection air nozzle is used to spray air to determine whether a smooth air path is formed in the detected hole to determine whether the part is installed in the forward direction.

[0006] A central control main board and a central control distribution board are fixedly provided at the lower part of the platform substrate. A pressure equalizing cavity is provided in the central control main board, and a main flow channel is provided in the central control distribution board.

[0007] An electromagnetic valve is provided between the main channel and the pressure equalizing chamber, which is controlled by the electromagnetic valve. The other end of the main channel is connected to the detection gas nozzle through a pipeline. When the electromagnetic valve is opened, the pressurized gas in the pressure equalizing chamber enters the detection gas nozzle through the main channel.

[0008] The centralized control panel is provided with a blocking detection structure. When the electromagnetic valve is open, if the detection nozzle is blocked, it can be detected by the blocking detection structure.

[0009] The blockage detection structure includes a branch flow channel, a pressure-sensing cavity, an intermediate cavity, and a pressure-applying cavity. The branch flow channel, the pressure-sensing cavity, the intermediate cavity, and the pressure-applying cavity are all provided inside the centralized control panel and are connected end to end in sequence.

[0010] The branch flow channel is communicated with the main flow channel, and a docking pipe is provided for external communication with the pressure chamber. The docking pipe is airtightly inserted into the centralized control mainboard and communicates with the pressure equalizing chamber.

[0011] A pressure-sensitive plug disc is provided in the pressure-sensitive cavity in airtight contact, and a pressure-applying plug disc is provided in the pressure-applying cavity in airtight contact. The diameter of the pressure-sensitive plug disc is larger than that of the pressure-applying plug disc, so that the pressure-bearing area of ​​the pressure-sensitive plug disc is larger; a synchronous coupling is fixedly connected between the pressure-sensitive plug disc and the pressure-applying plug disc.

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

[0013] When the synchronous coupling moves axially in the direction of the pressure plug, the circuit contact disc contacts the contact spring, and the contact spring forms a loop through the circuit contact disc, thereby detecting the movement of the synchronous coupling.

[0014] A transverse groove is provided in the centralized control panel, and the transverse groove cross-cuts the main channel. A self-inspection slide is provided in the transverse groove, and the transverse groove and the self-inspection slide are in sealed contact. A normally open hole is provided on the self-inspection slide, and the main channel is ventilated through the normally open hole. When the self-inspection slide moves, the normally open hole will be misaligned with the main channel, so that the main channel is closed.

[0015] A stabilizing chamber is provided inside the centralized control main board, one end of the stabilizing chamber is connected to the pressure equalizing chamber, an end support is fixedly provided at the other end of the stabilizing chamber, a high-pressure pipe is fixedly provided on the end support, a T-shaped air path is provided inside the end support, and the high-pressure pipe and the T-shaped air path are connected to each other.

[0016] A high-pressure piston is provided in sealing contact inside the high-pressure pipe. A connecting shaft is fixedly provided on one side of the high-pressure piston. A stabilizing plug disc is fixedly provided on the end of the connecting shaft. The stabilizing plug disc is in sliding sealing contact with the stabilizing chamber.

[0017] A stabilizing spring is provided on the side of the stabilizing plug facing the end support, a gas storage tank is fixedly provided on the outside of the centralized control mainboard, and a one-way gas valve is provided between the T-shaped gas path and the gas storage tank, through which the gas in the T-shaped gas path flows in a one-way direction toward the gas storage tank;

[0018] A one-way air intake valve is provided between the T-shaped air path and the outside atmosphere, and the outside atmosphere is allowed to flow into the T-shaped air path in one direction through the one-way air intake valve.

[0019] The gas storage tank is fixedly provided with a gas tank end seat, the gas tank end seat is provided with a pressure relief socket, a sealing plug shaft is inserted into the pressure relief socket, and the pressure relief socket and the sealing plug shaft are in airtight contact;

[0020] One end of the pressure relief socket is communicated with the interior 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 socket is provided with a chamfer, and a vertical through hole is provided at the chamfer, and 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 the lateral locking shaft and the vertical through hole are in airtight contact. 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 toward the inside of the gas storage tank;

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

[0024] A synchronous backplate is fixedly provided at the end of the blocking shaft, and the synchronous backplate is fixedly installed with the self-inspection slide. A magnetic plate is fixedly provided on the synchronous backplate, and a permanent magnet is fixedly provided on the centralized control panel. The permanent magnet and the magnetic plate are magnetically engaged, so that the blocking shaft has a movement tendency to move toward the inside of the pressure relief socket.

[0025] A detection method for a symmetrical part along-edge detection device based on air pressure detection, the method comprising the following steps:

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

[0027] Step 2: Control the air cylinder to detect the downward movement of the air nozzle;

[0028] Step 3: After the detection air nozzle moves down to its proper position, control the detection air nozzle to eject air. When the detection air nozzle ejects air smoothly, the position of the detection air nozzle and the detected hole corresponds to each other, and the parts are installed in the positive direction.

[0029] When the detection air nozzle is blocked, the detection air nozzle and the detected hole are misaligned up and down, and the parts are installed in reverse.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The symmetrical parts along-edge detection device of the present invention, based on air pressure detection, can detect the along-edge reversal problem that is easy to occur in the assembly process of symmetrical parts, avoiding the risk of misjudgment by manual visual inspection, and can realize batch synchronous detection at the same time, thereby improving detection efficiency.

[0032] The present invention can control the detection gas nozzle through the coordination of the centralized control main board and the centralized control distribution board, and perform detection and judgment when the detection gas nozzle is blocked; compared with the traditional technology of directly setting a pressure sensor, it can be triggered when the gas source pressure is low, avoiding the situation where the detection signal cannot be triggered when the gas source pressure is lower than the set threshold of the sensor.

[0033] The present invention cooperates with the transverse groove, the self-checking slide plate and the normally open hole to perform self-check on the blocking detection structure, and can timely discover when the blocking detection structure has a stuck problem.

[0034] Through the coordination of the stabilizing chamber, air storage tank, plugging shaft and other structures, not only can the air pressure in the pressure equalizing chamber be stabilized and controlled, but also the air pressure changes in the pressure equalizing chamber can be used to realize timing accumulation. When the use time exceeds a certain length, the self-test slide is controlled and driven, and self-test timing and driving are realized at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0036] Figure 2 It is a schematic diagram of the overall structure of the present invention from another angle.

[0037] Figure 3 Schematic diagram of the gas nozzle detection of the present invention.

[0038] Figure 4 This is a structural diagram of the centralized control mainboard and centralized control distribution board of the present invention.

[0039] Figure 5 This is a structural diagram of the centralized control main board and the centralized control distribution board from another angle of the present invention.

[0040] Figure 6 This is a half-section schematic diagram of the centralized control main board and the centralized control distribution board of the present invention.

[0041] Figure 7 This is a partial half-section top view of the centralized control main board and the centralized control distribution board of the present invention.

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

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

[0044] In the figure: 1, platform substrate; 2, cylinder; 3, detected hole; 4, detection nozzle; 5, centralized control main board; 6, centralized control distribution board; 7, pressure equalizing chamber; 8, main channel; 9, electromagnetic valve; 801, branch channel; 802, pressure-sensing chamber; 803, intermediate chamber; 804, pressure-applying chamber; 805, docking tube; 806, pressure-sensing plug disk; 807, pressure-applying plug disk; 808, synchronous coupling; 809, loop contact disk; 810, pin insert; 811, contact spring; 601, cross-section groove; 602, self-test slide plate; 603, normally open hole; 701, stabilizing chamber; 702, end support; 703, high-pressure pipe; 704 , T-type gas circuit; 705, high-pressure piston; 706, connecting shaft; 707, stabilizing plug disc; 708, gas storage tank; 709, one-way gas supply valve; 710, one-way air inlet valve; 711, gas tank end seat; 712, pressure relief socket; 713, blocking plug shaft; 714, lateral locking shaft; 715, locking shaft shrapnel; 716, synchronous back plate; 717, magnetic plate; 718, permanent magnet; 720, stabilizing spring; 10, spare parts; 101, locating pin; 102, adjusting track; 103, track slide; 104, cylinder bracket; 401, rubber ring; 719, gas source input screw hole; 812, centralized control output screw hole. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] See also Figures 1 to 9 The present invention provides a technical solution: a symmetrical part edge detection device based on air pressure detection, comprising a platform substrate 1, a cylinder 2 arranged above the platform substrate 1, a detection hole 3 opened on 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 in the figure, the detection air nozzle 4 is a tubular structure with an opening at the bottom and a lateral opening at the top. Air is supplied to the detection air nozzle 4 through the lateral opening at the top, so that the lower part of the detection air nozzle 4 ejects air outwards. The upper end of the detection air nozzle 4 is fixedly installed with the telescopic shaft of the cylinder 2.

[0047] The part is positioned and placed on the platform base plate 1. When the part is installed in the forward direction, the detection air nozzle 4 corresponds to the detected hole 3 up and down; when the part is installed in the reverse direction, the detection air nozzle 4 and the detected hole 3 are misaligned up and down; the detection air nozzle 4 is controlled to move downward by the cylinder 2, and then the detection air nozzle 4 is used to spray air to judge whether a smooth air path is formed in the detected hole 3 to determine whether the part is installed in the forward direction.

[0048] The lower part of the platform substrate 1 is fixed with a centralized control main board 5 and a centralized control distribution board 6. A pressure equalizing cavity 7 is provided in the centralized control main board 5. There is only one group of pressure equalizing cavity 7. A main flow channel 8 is provided in the centralized control distribution board 6. Figure 6 As shown in , the main channel 8 is provided with several groups, which correspond one to one with the detection air nozzle 4. An electromagnetic air valve 9 is provided between the main channel 8 and the pressure equalizing chamber 7, and the on-off control is performed by the electromagnetic air valve 9. The other end of the main channel 8 is connected to the detection air nozzle 4 through a pipeline. When the electromagnetic air valve 9 is opened, the pressure gas in the pressure equalizing chamber 7 enters the detection air nozzle 4 through the main channel 8; a blocking detection structure is provided in the control panel 6. When the electromagnetic air valve 9 is opened, when the detection air nozzle 4 is blocked, it can be detected by the blocking detection structure. The blocking detection structure includes a branch channel 801, a pressure sensing chamber 802, an intermediate chamber 803 and a pressure chamber 804. The branch channel 801, the pressure sensing chamber 802, the intermediate chamber 803 and the pressure chamber 804 are all opened inside the control panel 6 and are connected end to end in sequence.

[0049] Branch channel 801 communicates with main channel 8. A docking plug 805 is provided for external communication with pressure chamber 804. This plug 805 is airtightly inserted into central control mainboard 5 and communicates with pressure-equalizing chamber 7. A pressure-sensing plug 806 is airtightly provided in pressure-sensing chamber 802, while a pressure-applying plug 807 is airtightly provided in pressure-applying chamber 804. The diameter of pressure-sensing plug 806 is larger than that of pressure-applying plug 807, increasing its pressure-bearing 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 block 810 is embedded in the side wall of the middle cavity 803. The pin block 810 is provided with at least two groups of contact springs 811; the external circuit monitors and determines in real time whether the contact springs 811 form a loop through the pin block 810.

[0051] When the synchronous coupling 808 moves axially toward the direction of the pressure plug 807 , the loop contact disc 809 contacts the contact spring 811 , and the contact spring 811 forms a loop through the loop contact disc 809 , thereby detecting the movement of the synchronous coupling 808 .

[0052] A transverse groove 601 is provided in the centralized control panel 6, which cross-sections the main channel 8. A self-inspection slide 602 is provided in the transverse groove 601. The transverse groove 601 and the self-inspection slide 602 are in sealed contact. A normally open hole 603 is provided on the self-inspection slide 602, and the main channel 8 is ventilated through the normally open hole 603. When the self-inspection slide 602 moves, the normally open hole 603 will be misaligned with the main channel 8, so that the main channel 8 is closed.

[0053] A stabilizing chamber 701 is provided inside the centralized control main board 5, one end of the stabilizing chamber 701 is connected to the pressure equalizing chamber 7, an end support 702 is fixedly provided at the other end of the stabilizing chamber 701, a high-pressure pipe 703 is fixedly provided on the end support 702, a T-shaped gas path 704 is provided inside the end support 702, and the high-pressure pipe 703 and the T-shaped gas path 704 are connected to each other.

[0054] A high-pressure piston 705 is provided in sealing contact inside the high-pressure pipe 703 , a connecting shaft 706 is fixedly provided on one side of the high-pressure piston 705 , a stabilizing plug disc 707 is fixedly provided on the end of the connecting shaft 706 , and a sliding sealing contact is made between the stabilizing plug disc 707 and the stabilizing chamber 701 .

[0055] A stabilizing spring 720 is provided on the side of the stabilizing plug 707 facing the end support 702, and a gas tank 708 is fixedly provided on the outside of the centralized control main board 5. A one-way gas supply valve 709 is provided between the T-shaped gas circuit 704 and the gas tank 708, and the gas in the T-shaped gas circuit 704 flows unidirectionally toward the gas tank 708 through the one-way gas supply valve 709; a one-way air intake valve 710 is provided between the T-shaped gas circuit 704 and the external atmosphere, and the external atmosphere flows unidirectionally toward the T-shaped gas circuit 704 through the one-way air intake valve 710.

[0056] A gas tank end seat 711 is fixedly provided on the gas tank 708, and a pressure relief socket 712 is opened in the gas tank end seat 711, and a sealing plug shaft 713 is inserted into the pressure relief socket 712, and the pressure relief socket 712 and the sealing plug shaft 713 are in airtight contact; one end of the pressure relief socket 712 is connected to the interior of the gas tank 708, and when positive pressure gas is filled in the gas tank 708, the gas will exert pressure on the end of the sealing plug shaft 713.

[0057] The end of the pressure relief socket 712 is provided with a chamfer, and a vertical through hole is provided at the chamfer, and the other end of the vertical through hole is connected to the gas tank 708; a lateral locking shaft 714 is inserted in the vertical through hole, and the lateral locking shaft 714 and the vertical through hole are in airtight contact, and a locking shaft spring piece 715 is provided at the end of the lateral locking shaft 714, and the locking shaft spring piece 715 applies an elastic pulling force to the lateral locking shaft 714 to move toward the inside of the gas tank 708; when there is positive pressure gas exceeding a certain pressure threshold in the gas tank 708, the gas pressure will push the lateral locking shaft 714 to overcome the elastic force of the locking shaft spring piece 715 and move, so that the lateral locking shaft 714 has an elastic movement tendency to be in squeeze contact with the outer surface of the blocking plug shaft 713.

[0058] A synchronous back plate 716 is fixedly provided at the end of the blocking shaft 713, and the synchronous back plate 716 is fixedly installed with the self-inspection slide 602. A magnetic plate 717 is fixedly provided on the synchronous back plate 716, and a permanent magnet 718 is fixedly provided on the centralized control panel 6. The permanent magnet 718 and the magnetic plate 717 are magnetically engaged, so that the blocking shaft 713 has a movement tendency to move toward the inside of the pressure relief socket 712.

[0059] A detection method for a symmetrical part along-edge detection device based on air pressure detection, the method comprising the following steps:

[0060] Step 1: Position and place the assembled parts on the platform substrate 1;

[0061] Step 2: Control the detection nozzle 4 downward through the cylinder 2;

[0062] Step 3: After the detection air nozzle 4 moves down to its proper position, the detection air nozzle 4 is controlled to eject air. When the detection air nozzle 4 ejects air smoothly, the positions of the detection air nozzle 4 and the detected hole 3 correspond to each other, and the parts are installed in the positive direction.

[0063] When the detection air nozzle 4 is blocked, the detection air nozzle 4 and the detected hole 3 are dislocated up and down, and the parts are installed in reverse.

[0064] like Figure 1 As shown in the figure, the part product 10 is placed above the platform substrate 1 for inspection. The upper surface of the platform substrate 1 is inserted with positioning pins 101, and the part product 10 is positioned and limited by the positioning pins 101, so that the position of the part product 10 can be determined when the part product 10 is placed.

[0065] like Figure 1 As shown in FIG, an adjustment rail 102 is fixedly provided above the platform base plate 1, and a rail slide 103 is slidably provided above the adjustment rail 102. The rail slide 103 has a locking function and can be locked in position relative to the adjustment rail 102. A cylinder bracket 104 is fixedly provided on the rail slide 103, and the cylinder 2 is mounted on the cylinder bracket 104.

[0066] like Figure 3 As shown in FIG, a rubber ring 401 is fixedly provided at the lower portion of the detection air nozzle 4 , and the detection air nozzle 4 is in sealing contact with the surface of the component product 10 through the rubber ring 401 .

[0067] like Figure 6 As shown in FIG, a gas source input screw hole 719 is provided on one side of the pressure equalizing chamber 7, through which the pressure equalizing chamber 7 is connected to the external gas source. A centralized control output screw hole 812 is provided at the end of the main channel 8, through which a pipe is installed, so that the main channel 8 is connected to the detection gas 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 asymmetric design, so that when the installation direction of the part product 10 is correct, the detection air nozzle 4 moves downward to form an unobstructed air path through the detection hole 3. Otherwise, the lower part of the detection air nozzle 4 is blocked by the upper surface of the part product 10.

[0069] like Figure 6 and Figure 7 As shown in the figure, the gas source is connected to the interior of the pressure equalizing chamber 7 through the gas source input screw hole 719, so that the interior of the pressure equalizing chamber 7 is in a positive pressure state, and the gas pressure acts on the pressure plug disk 807 through the docking tube 805. At this time, the circuit contact disk 809 and the contact spring 811 are in a separated state.

[0070] When the gas nozzle 4 needs to be tested for air flow, the electromagnetic valve 9 is controlled to open, and the positive pressure gas in the pressure equalizing chamber 7 enters the main channel 8 through the electromagnetic valve 9, and is input into the test gas nozzle 4 through the centralized control output screw hole 812. At this time, if a smooth air path is formed below the test gas nozzle 4, the gas is directly ejected into the outside atmosphere through the test gas nozzle 4. Since the main channel 8 is connected to the outside atmosphere through the test gas nozzle 4, the gas pressure in the main channel 8 is extremely low, much lower than the gas pressure in the pressure equalizing chamber 7. Figure 7 As shown in the figure, the main channel 8 is connected to the pressure-sensing chamber 802 through the branch channel 801, and the pressure-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 disc 806 is much smaller than the gas pressure on the pressure-applying plug disc 807, and the circuit contact disc 809 does not move.

[0071] When the detection nozzle 4 is blocked due to misalignment with the detected hole 3, the gas in the main channel 8 cannot be discharged to the outside atmosphere through the detection nozzle 4. At this time, the pressure equalizing chamber 7 forms a stable gas connection circuit with the pressure sensing chamber 802 through the main channel 8 and the branch channel 801 in turn. The gas pressure acting on the pressure sensing plug 806 is the same as the gas pressure acting on the pressure plug 807. According to the pressure formula, when the gas pressure is constant, the force generated is proportional to the area. Since the diameter of the pressure sensing plug 806 is large, the pressure applied to the pressure plug 807 is proportional to the area. The pressure-applying plug disc 807 and the pressure-sensing plug disc 806 have a larger area. When the force is unbalanced, the driving circuit contact disc 809 moves toward the contact spring 811, so that the circuit contact disc 809 and the contact spring 811 contact to form a circuit. After the pin block 810 detects that the circuit of the contact spring 811 is closed, the movement state of the circuit contact disc 809 is known, and it is judged that a blockage is formed below the detection air nozzle 4, the detection air nozzle 4 is misaligned with the detected hole 3, and the component product 10 is installed in reverse, and an audible and visual alarm prompt is given.

[0072] In the above process, when a blockage is formed below the detection air nozzle 4, the present invention achieves this by utilizing the area difference to make the forces on the pressure-sensing plug disc 806 and the pressure-applying plug disc 807 unbalanced under the condition of the same air pressure. It can adapt to lower air pressure conditions, and the difference in the unbalanced forces only needs to overcome the friction between the pistons of the pressure-sensing plug disc 806 and the pressure-applying plug disc 807. By ensuring that the working friction between the pressure-sensing plug disc 806 and the pressure-applying plug disc 807 is small enough, triggering can be guaranteed when the air pressure is extremely low. Compared with the traditional method of directly setting an air pressure sensor to detect a fixed trigger threshold, it can avoid the situation where it is difficult to trigger when the air source pressure is lower than the threshold; and if the threshold is set too low, when the air source pressure is high, there will still be a certain proportion of positive pressure in the main channel 8 when the lower part of the detection air nozzle 4 is unobstructed, which is prone to false alarm triggering.

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

[0074] During the pressure stabilization process, the stabilizing plug 707 moves back and forth, and the reciprocating movement of the stabilizing plug 707 drives the high-pressure piston 705 to move back and forth. The high-pressure piston 705 and the high-pressure pipe 703 cooperate to form a pump body structure, and cooperate with the one-way air inlet valve 710 and the one-way air delivery valve 709 to absorb the external air pressure and pump it into the air storage tank 708. Figure 7 As shown in , the piston area of ​​the stabilizing plug 707 is much larger than the piston area of ​​the high-pressure piston 705, which can proportionally enhance the pumping pressure of the high-pressure piston 705.

[0075] As the usage time increases, the gas pressure in the gas tank 708 gradually increases, and the air pressure in the gas tank 708 acts on the end face of the blocking plug shaft 713. At this time, the blocking plug shaft 713 is locked in position by the attraction magnetic force 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 attraction magnetic force is the largest. Once the gas pressure in the gas tank 708 can push the blocking plug shaft 713 to move to the left, the magnetic plate 717 and the permanent magnet 718 will begin to separate, and due to the distance between the magnetic plate 717 and the permanent magnet 718, as the distance increases, the magnetic attraction force is greatly attenuated, so that once the blocking plug shaft 713 moves to the left under the drive of air pressure, it can directly move significantly to the left. Because the side locking shaft 714 tends to extend under the pressure of the gas in the gas tank 708, when the end of the blocking plug 713 moves leftward and passes through the side locking shaft 714, the side locking shaft 714 will extend into the pressure relief socket 712, preventing the blocking plug 713 from returning to its original position. At this time, the gas in the gas tank 708 continues to be discharged to the outside through the pressure relief socket 712.

[0076] At the same time, due to the leftward movement of the blocking plug shaft 713, the synchronous back plate 716, and the self-inspection slide plate 602 and other structures, the normally open hole 603 and the main channel 8 will be misaligned, and the end of the main channel 8 will be blocked. At this time, the main channel 8 is no longer connected to the detection air nozzle 4, and the electromagnetic air valve 9 is controlled to open. Similarly, the pressure equalizing chamber 7 is directly and stably connected to the pressure sensing chamber 802 through the main channel 8. The device performs regular self-inspections according to the usage time, and can promptly detect any stuck problems in the blocking detection structure.

[0077] When the gas pressure in the gas tank 708 is discharged to below a certain threshold, the pressure of the gas pressure in the gas tank 708 acting on the end face of the lateral lock shaft 714 is less than the elastic tension of the lock shaft spring piece 715, so that the lateral lock shaft 714 resets and moves under the elastic tension of the lock shaft spring piece 715. At this time, the lateral lock shaft 714 is pulled out from the pressure relief socket 712 and no longer blocks the blocking plug shaft 713. Under the action of the magnetic attraction between the magnetic attraction plate 717 and the permanent magnet 718, the blocking plug shaft 713 is reinserted and locked into the pressure relief socket 712, thereby realizing automatic reset of the device.

[0078] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A symmetrical part edge detection device based on air pressure detection includes a platform base, a cylinder arranged above the platform base, a hole to be detected that is opened through the part, and a detection air nozzle, characterized by: The detection air nozzle is raised and lowered by a cylinder; The parts are positioned and placed on the platform baseplate. When the parts are installed in the forward direction, the detection air nozzle corresponds to the detected hole up and down; when the parts are installed in the reverse direction, the detection air nozzle and the detected hole are misaligned up and down. The detection air nozzle is controlled by the cylinder to move downward, and then the detection air nozzle is used to spray air to determine whether a smooth air path is formed in the detected hole to determine whether the part is installed in the forward direction.

2. The symmetrical part along-edge detection device based on air pressure detection according to claim 1 is characterized in that: A central control main board and a central control distribution board are fixedly provided at the lower part of the platform substrate. A pressure equalizing cavity is provided in the central control main board, and a main flow channel is provided in the central control distribution board. An electromagnetic valve is provided between the main channel and the pressure equalizing chamber, which is controlled by the electromagnetic valve. The other end of the main channel is connected to the detection gas nozzle through a pipeline. When the electromagnetic valve is opened, the pressurized gas in the pressure equalizing chamber enters the detection gas nozzle through the main channel. The centralized control panel is provided with a blocking detection structure. When the electromagnetic valve is open, if the detection nozzle is blocked, it can be detected by the blocking detection structure.

3. The symmetrical part along-edge detection device based on air pressure detection according to claim 2, characterized in that: The blockage detection structure includes a branch flow channel, a pressure-sensing cavity, an intermediate cavity, and a pressure-applying cavity. The branch flow channel, the pressure-sensing cavity, the intermediate cavity, and the pressure-applying cavity are all provided inside the centralized control panel and are connected end to end in sequence. The branch flow channel is communicated with the main flow channel, and a docking pipe is provided for external communication with the pressure chamber. The docking pipe is airtightly inserted into the centralized control mainboard and communicates with the pressure equalizing chamber.

4. The symmetrical part along-edge detection device based on air pressure detection according to claim 3 is characterized in that: A pressure-sensitive plug disc is provided in the pressure-sensitive cavity in airtight contact, and a pressure-applying plug disc is provided in the pressure-applying cavity in airtight contact. The diameter of the pressure-sensitive plug disc is larger than that of the pressure-applying plug disc, so that the pressure-bearing area of ​​the pressure-sensitive plug disc is larger; a synchronous coupling is fixedly connected between the pressure-sensitive plug disc and the pressure-applying plug disc.

5. The symmetrical part along-edge detection device based on air pressure detection according to claim 4 is characterized in that: A loop contact plate is fixedly provided on the synchronous coupling, a pin insert is embedded in the side wall of the intermediate cavity, and at least two groups of contact springs are provided on the pin insert; When the synchronous coupling moves axially in the direction of the pressure plug, the circuit contact disc contacts the contact spring, and the contact spring forms a loop through the circuit contact disc, thereby detecting the movement of the synchronous coupling.

6. The symmetrical part along-edge detection device based on air pressure detection according to claim 1, characterized in that: A transverse groove is provided in the centralized control panel, and the transverse groove cross-cuts the main channel. A self-inspection slide is provided in the transverse groove, and the transverse groove and the self-inspection slide are in sealed contact. A normally open hole is provided on the self-inspection slide, and the main channel is ventilated through the normally open hole. When the self-inspection slide moves, the normally open hole will be misaligned with the main channel, so that the main channel is closed.

7. The symmetrical part along-edge detection device based on air pressure detection according to claim 6, characterized in that: A stabilizing chamber is provided inside the centralized control main board, one end of the stabilizing chamber is connected to the pressure equalizing chamber, an end support is fixedly provided at the other end of the stabilizing chamber, a high-pressure pipe is fixedly provided on the end support, a T-shaped air path is provided inside the end support, and the high-pressure pipe and the T-shaped air path are connected to each other.

8. The symmetrical part along-edge detection device based on air pressure detection according to claim 7, characterized in that: A high-pressure piston is provided in sealing contact inside the high-pressure pipe. A connecting shaft is fixedly provided on one side of the high-pressure piston. A stabilizing plug disc is fixedly provided on the end of the connecting shaft. The stabilizing plug disc is in sliding sealing contact with the stabilizing chamber.

9. The symmetrical part along-edge detection device based on air pressure detection according to claim 8, characterized in that: A stabilizing spring is provided on the side of the stabilizing plug facing the end support, a gas storage tank is fixedly provided on the outside of the centralized control mainboard, and a one-way gas valve is provided between the T-shaped gas path and the gas storage tank, through which the gas in the T-shaped gas path flows in a one-way direction toward the gas storage tank; A one-way air intake valve is provided between the T-shaped air path and the outside atmosphere, and the outside atmosphere is allowed to flow into the T-shaped air path in one direction through the one-way air intake valve.

10. The symmetrical part along-edge detection device based on air pressure detection according to claim 9, characterized in that: The gas storage tank is fixedly provided with a gas tank end seat, the gas tank end seat is provided with a pressure relief socket, a sealing plug shaft is inserted into the pressure relief socket, and the pressure relief socket and the sealing plug shaft are in airtight contact; One end of the pressure relief socket is communicated with the interior 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.

11. The symmetrical part along-edge detection device based on air pressure detection according to claim 10, characterized in that: The end of the pressure relief socket is provided with a chamfer, and a vertical through hole is provided at the chamfer, and 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 the lateral locking shaft and the vertical through hole are in airtight contact. 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 toward the inside of the gas storage tank; When there is positive pressure gas exceeding a certain pressure threshold in the gas tank, the gas pressure will push the lateral lock shaft to overcome the elastic force of the lock shaft spring and move, so that the lateral lock shaft has an elastic movement tendency to squeeze and contact the outer surface of the blocking plug shaft.

12. The symmetrical part along-edge detection device based on air pressure detection according to claim 11, characterized in that: A synchronous backplate is fixedly provided at the end of the blocking shaft, and the synchronous backplate is fixedly installed with the self-inspection slide. A magnetic plate is fixedly provided on the synchronous backplate, and a permanent magnet is fixedly provided on the centralized control panel. The permanent magnet and the magnetic plate are magnetically engaged, so that the blocking shaft has a movement tendency to move toward the inside of the pressure relief socket.

13. The detection method of the symmetrical part along-edge detection device based on air pressure detection according to any one of claims 1 to 12, characterized in that: The method comprises the following steps: Step 1: Position the assembled parts on the platform substrate; Step 2: Control the air cylinder to detect the downward movement of the air nozzle; Step 3: After the detection air nozzle moves down to its proper position, control the detection air nozzle to eject air. When the detection air nozzle ejects air smoothly, the position of the detection air nozzle and the detected hole corresponds to each other, and the parts are installed in the positive direction. When the detection air nozzle is blocked, the detection air nozzle and the detected hole are misaligned up and down, and the parts are installed in reverse.

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