Part inner hole size detection method based on air pressure value

Abstract

The invention discloses a part inner hole size detection method based on an air pressure value, a detection mechanism is used, the detection mechanism comprises a support, a workpiece seat, an air needle, a first actuator and a second actuator, the first actuator and the second actuator are arranged on the support, the workpiece seat is arranged on the first actuator, the air needle is arranged on the second actuator, and the first actuator and the second actuator are arranged on the support. The first actuator drives the workpiece seat to move to a detection position, the second actuator drives the air needle to move up and down, the air needle is connected with the first sensor and the pressure stabilizing assembly, the pressure stabilizing assembly is used for providing an air source for stabilizing pressure, and the first sensor is used for measuring a current air pressure value; at least two air outlet holes are formed in the side wall of the air needle at equal intervals; a station matched with a part is arranged on the upper surface of the workpiece seat, and a clearance groove which is opened in the circumferential direction is concavely formed in the station; the air needle is arranged, the inner hole size is determined according to the air pressure value, the detection efficiency is greatly improved, and the detection precision is high. The gas needle and the workpiece base are provided with protection assemblies, and equipment damage caused by dislocation is avoided.

Description

Technical Field

[0001] The present invention relates to the field of inner hole detection, and particularly to a method for detecting the size of a part inner hole based on air pressure value. Background Art

[0002] Automobile parts are precision parts. Therefore, high requirements are imposed on dimensions. For relatively small inner holes, there are two conventional detection methods. The first one is to use a go-no-go gauge to check the size of the part inner hole; however, the detection accuracy of the go-no-go gauge is low and cannot meet the requirements of automobile parts. The second one is to collect images through a high-definition camera and compare them by a computer; but when using this method, high requirements are imposed on the environment and there are many interference factors. Slight deviation will affect the detection result and cause false detection. Summary of the Invention

[0003] Aiming at the defects existing in the above prior art, the main purpose of the present invention is to overcome the deficiencies of the prior art, and discloses a method for detecting the size of a part inner hole based on air pressure value. A detection mechanism is used. The detection mechanism includes a bracket, a workpiece seat, an air needle, a first actuator and a second actuator. The first actuator and the second actuator are arranged on the bracket. The workpiece seat is arranged on the first actuator. The air needle is arranged on the second actuator. The first actuator drives the workpiece seat to move to the detection position. The second actuator drives the air needle to move up and down. The air needle is connected to a first sensor and a voltage stabilizing component. The voltage stabilizing component is used to provide a gas source with stable pressure. The first sensor is used to measure the current air pressure value; at least two air outlet holes are arranged at equal intervals on the side wall of the air needle; a working position matching the part is arranged on the upper surface of the workpiece seat, and a circumferentially open clearance groove is recessed on the working position.

[0004] It includes the following steps:

[0005] Step 1, rotate the part to the detection mechanism through a rotating disk;

[0006] Step 2, drive the workpiece seat to lift through the first actuator to lift the part on the rotating disk to the detection position;

[0007] Step 3, the second actuator drives the air needle to move up and down, gas is ejected from the air outlet holes, and the air pressure value of the gas is monitored through the first sensor;

[0008] Step 4, compare the monitored data with the pre-stored qualified data range in the computer. If it is within this range, the part is qualified; otherwise, it is unqualified.

[0009] Further, the first actuator is a cylinder, and the second actuator is an electric cylinder.

[0010] Further, the air needle is arranged on the second actuator through a first protection component; the first protection component includes a first fixed seat, a first spring and a floating rod. The floating rod is vertically and floatingly arranged on the first fixed seat, the first spring is arranged on the floating rod, and the first spring provides a downward thrust for the floating rod. The floating rod is axially provided with a through air path, the air needle is installed at the lower end of the floating rod, and the upper end of the floating rod is connected to the first sensor.

[0011] Further, a vertically penetrating first guide hole is arranged on the first fixed seat, the floating rod is slidably arranged in the first guide hole, and a limit nut is arranged at the upper end of the floating rod; a limit edge is arranged at the lower end of the floating rod, and both ends of the first spring act on the limit edge and the first fixed seat.

[0012] Further, an adjusting component is arranged on the second actuator, the air needle is arranged on the adjusting component, and the horizontal position of the air needle is adjusted by the adjusting component.

[0013] Further, the adjusting component includes a second fixed seat, a first adjusting block and a second adjusting block. The second fixed seat is arranged on the second actuator, a first waist-shaped hole in the X-axis direction is arranged on the second fixed seat, the first adjusting block is arranged on the second fixed seat and fixed to the first waist-shaped hole by a screw. A second waist-shaped hole in the Y-axis direction is arranged on the second adjusting block, the second adjusting block is arranged on the first adjusting block, and a screw passes through the second waist-shaped hole to fix the first adjusting block and the second adjusting block. The air needle is connected to the second adjusting block.

[0014] Further, a fixing plate is arranged on the side of the second fixed seat, a first adjusting screw is arranged on the fixing plate, and the first adjusting screw acts on the first adjusting block to push the first adjusting block to move along the X-axis by the first adjusting screw; an adjusting screw hole is arranged on the second adjusting block, a second adjusting screw is arranged on the adjusting screw hole, and one end of the second adjusting screw acts on the second fixed seat to push the second adjusting block to move along the Y-axis by the second adjusting screw.

[0015] Further, the first actuator is arranged on the bracket through an adjusting plate. Third waist-shaped holes are arranged on both sides of the surface of the adjusting plate, and the adjusting plate is fixed to the bracket by screws, and the position of the adjusting plate in the Z-axis direction is adjusted by the third waist-shaped holes.

[0016] Further, the workpiece seat is arranged on the first actuator through a second protection component. The second protection component includes a third fixed seat, a first limiting block, a second limiting block, and a second spring. The third fixed seat is arranged on the first actuator. A second guide hole cooperating with the workpiece seat is arranged on the third fixed seat. The first limiting block and the second limiting block are arranged at the lower end and the middle part. The second spring is arranged on the workpiece seat, and the second spring provides an upward thrust for the workpiece seat.

[0017] Further, an axial exhaust passage is arranged between two adjacent air outlet holes.

[0018] The beneficial effects achieved by the present invention are as follows:

[0019] By arranging an air needle in the present invention, the inner hole size is determined according to the air pressure value, greatly improving the detection efficiency and having high detection accuracy. Protection components are arranged on both the air needle and the workpiece seat to avoid equipment damage caused by dislocation. Air passages are arranged circumferentially around the air outlet holes of the air needle to promote gas discharge, so as to improve the detection accuracy. Description of the Drawings

[0020] Figure 1 is a three-dimensional structural schematic diagram of a part inner hole size detection device based on air pressure value according to the present invention;

[0021] Figure 2 is a schematic diagram of the cooperation between the second actuator, the adjustment component, and the first protection component;

[0022] Figure 3 is Figure 2 an enlarged view of A in

[0023] Figure 4 is a sectional view of the second actuator, the adjustment component, and the first protection component;

[0024] Figure 5 is an exploded view of the adjustment component;

[0025] Figure 6 A schematic diagram of the cooperation between the first actuator, the workpiece seat, and the second protection component;

[0026] Figure 7 is Figure 6 an enlarged view of A in

[0027] The reference numerals are as follows:

[0028] 1. Bracket, 2. Workpiece seat, 3. Air needle, 4. First actuator, 5. Second actuator, 6. First sensor, 7. First protection component, 8. Adjustment component, 9. Second protection component, 11. Adjustment plate, 12. Third waist-shaped hole, 21. Workstation, 22. Clearance groove, 31. Air outlet hole, 32. Exhaust passage, 71. First fixed seat, 72. Second spring, 73. Floating rod, 74. Limit nut, 75. Second sensor, 731. Air path, 732. Limit edge, 81. Second fixed seat, 82. First adjustment block, 83. Second adjustment block, 84. Fixed plate, 85. First adjustment screw, 86. Second adjustment screw, 811. First waist-shaped hole, 831. Second waist-shaped hole, 91. Third fixed seat, 92. First limit block, 93. Second limit block, 94. Second spring. Detailed implementation manner

[0029] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] A method for detecting the inner hole size of a part based on air pressure value uses the following detection mechanism. The detection mechanism includes a bracket 1, a workpiece seat 2, an air needle 3, a first actuator 4 and a second actuator 5. The first actuator 4 and the second actuator 5 are arranged on the bracket 1. The workpiece seat 2 is arranged on the first actuator 4, and the air needle 3 is arranged on the second actuator 5. The first actuator 4 drives the workpiece seat 2 to move to the detection position, and the second actuator 5 drives the air needle 3 to move up and down. The air needle 3 is connected to the first sensor 6 and a voltage stabilizing component. A gas source with stable pressure is provided by the voltage stabilizing component, and the first sensor 6 is used to measure the current air pressure value; at least two air outlet holes 31 are arranged at equal intervals on the side wall of the air needle 3; the upper surface of the workpiece seat 2 is provided with a workstation 21 that cooperates with the part, and a clearance groove 22 that is recessed and open in the circumferential direction is provided on the workstation 21. Through the setting of the clearance groove 22 with an open structure, the discharge of gas is promoted to avoid blocking the discharge of gas and hard affecting the measured air pressure value. Among them, the first sensor 7 is a gas pressure sensor.

[0031] In one embodiment, the first actuator 4 is a cylinder, and the second actuator 5 is an electric cylinder. The first actuator 4 is used to control the switching of the workpiece seat between the retracted position and the detection position, and their positions are fixed. Using a cylinder can reduce the equipment cost and has a fast response. The second actuator 5 drives the air needle 3 to move up and down. The current displacement, that is, the height position of the air needle 3, is collected by the electric cylinder and recorded together with the currently collected air pressure value, so as to realize the axial full inspection of the inner hole of the part.

[0032] In one embodiment, the air needle 3 is disposed on the second actuator 5 through the first protection component 7; the first protection component 7 includes a first fixed seat 71, a first spring 72 and a floating rod 73. The floating rod 73 is vertically and floatingly disposed on the first fixed seat 71. The first spring 72 is disposed on the floating rod 73 to provide a downward thrust for the floating rod 73. The floating rod 73 is axially provided with a through air path 731. The air needle 3 is installed at the lower end of the floating rod 73, and the upper end of the floating rod 73 is connected to the first sensor 6.

[0033] In the above embodiment, a vertically penetrating first guide hole is provided on the first fixed seat 71. The floating rod 73 is slidably disposed in the first guide hole, and a limit nut 74 is provided at the upper end of the floating rod 73; a limit edge 732 is provided at the lower end of the floating rod 73, and both ends of the first spring 72 act on the limit edge 732 and the first fixed seat 71. When the air needle 3 is misaligned with the part, the second actuator 5 drives the air needle to move downward. The air needle 3 cannot be inserted into the hole of the part, avoiding damage to the air needle and the part. The floating rod 73 remains stationary, and the first fixed seat 71 continues to move downward. During this process, the first spring 72 is compressed. When the second actuator 5 resets, the floating rod 73 is reset by the restoring force of the first spring 72.

[0034] In the above embodiment, a second sensor 75 is further provided on the first protection component 7. The second sensor 75 is disposed on the first fixed seat 71 to sense the movement of the floating rod 73. Specifically, the second sensor 75 is a proximity switch, and the limit nut is used as an identification block. When the air needle 3 is blocked, the floating rod 73 remains stationary, while the first fixed seat 71 continues to move downward, so that the second sensor 75 recognizes the limit nut 74, indicating that the air needle 3 is not aligned with the part at this time.

[0035] In one embodiment, an adjusting component 8 is provided on the second actuator 5, and the air needle 3 is disposed on the adjusting component 8 to adjust the horizontal position of the air needle 3 by the adjusting component 8.

[0036] In the above embodiment, the adjusting component 8 includes a second fixed seat 81, a first adjusting block 82 and a second adjusting block 83. The second fixed seat 81 is disposed on the second actuator 5. A first waist-shaped hole 811 in the X-axis direction is provided on the second fixed seat 81. The first adjusting block 82 is disposed on the second fixed seat 81 and fixed to the first waist-shaped hole 811 by a screw. A second waist-shaped hole 831 in the Y-axis direction is provided on the second adjusting block 83. The second adjusting block 83 is disposed on the first adjusting block 82, and the screw passes through the second waist-shaped hole 831 to fix the first adjusting block 82 and the second adjusting block 83. The air needle 3 is connected to the second adjusting block 83. The position of the air needle 3 is adjusted in the X-axis and Y-axis directions through the adjusting component 8.

[0037] Preferably, the second fixing seat 81 and the second adjusting block 83 are provided with guide grooves that cooperate with the first adjusting block 82. The first adjusting block 82 is placed in the guide groove, and the guide groove is used to guide the first adjusting block 82 to move along the X-axis and guide the second adjusting block 82 to move along the Y-axis.

[0038] In one embodiment, a fixing plate 84 is provided on the side of the second fixing seat 81. A first adjusting screw 85 is provided on the fixing plate 84. The first adjusting screw 85 acts on the first adjusting block 82, and the first adjusting block 82 is pushed to move along the X-axis by the first adjusting screw 85; an adjusting screw hole is provided on the second adjusting block 83, and a second adjusting screw 86 is provided on the adjusting screw hole. One end of the second adjusting screw 86 acts on the second fixing seat 81, and the second adjusting block 83 is pushed to move along the Y-axis by the second adjusting screw 86. Among them, the second fixing seat 81 is L-shaped, and the second adjusting screw 86 acts on the vertical plate of the second fixing seat 81.

[0039] In the above embodiment, the fixing plates 84 are provided on both sides of the second fixing seat 81, and the first adjusting screws 85 are provided on both fixing plates 84 to facilitate selecting the corresponding first adjusting screw 85 according to the adjusting direction of the first adjusting block 82.

[0040] In one embodiment, the first actuator 4 is provided on the bracket 1 through the adjusting plate 11. Third waist-shaped holes 12 are provided on both sides of the surface of the adjusting plate 11. The adjusting plate 11 is fixed to the bracket 1 by screws, and the position of the adjusting plate 11 in the Z-axis direction is adjusted by using the third waist-shaped holes 12. In this embodiment, three waist-shaped holes are provided on each side of the third waist-shaped holes 12, thereby improving the reliability of the installation of the adjusting plate 11 and the bracket 1.

[0041] In one embodiment, the workpiece seat 2 is provided on the first actuator 4 through the second protection assembly 9. The second protection assembly 9 includes a third fixing seat 91, a first limiting block 92, a second limiting block 93, and a second spring 94. The third fixing seat 91 is provided on the first actuator 4. A second guide hole that cooperates with the workpiece seat 2 is provided on the third fixing seat 91. The first limiting block 92 and the second limiting block 93 are provided at the lower end and the middle. The second spring 94 is provided on the workpiece seat 4, and an upward thrust is provided for the workpiece seat 2 by the second spring 94. When the first actuator 4 drives the workpiece seat 2 to move upward, if the workpiece seat 2 is not aligned with the workpiece, it will contact the rotating disk, and then the workpiece seat 2 cannot continue to move upward. The second spring 94 is used to protect the workpiece seat 2 to prevent damage to the workpiece seat 2 or the rotating disk.

[0042] In one embodiment, an axial exhaust passage 32 is provided between two adjacent air outlet holes 31. The air discharged from the air outlet holes 31 can be quickly discharged through the exhaust passage 31 to avoid affecting the measurement accuracy.

[0043] In one embodiment, three air outlet holes 31 are provided.

[0044] In the above embodiment, the voltage stabilizing component is used to provide a stable pressure air source supply for the air needle. The voltage stabilizing component is a conventional component; in this embodiment, the voltage stabilizing component includes an air source processor, a valve island, a pressure stabilizing tank, and a precision pressure reducing valve connected in sequence.

[0045] The present invention discloses a detection method according to a detection device, including the following steps:

[0046] Step 1, rotate the part to the detection mechanism through the rotating disk;

[0047] Step 2, drive the workpiece seat to lift through the first actuator to lift the part on the rotating disk to the detection position;

[0048] Step 3, the second actuator drives the air needle to move up and down, the gas sprays out from the air outlet hole, and the air pressure value of the gas is monitored by the first sensor;

[0049] Step 4, compare the monitored data with the pre-stored qualified data range in the computer. If it is within this range, the part is qualified; otherwise, it is unqualified.

[0050] Wherein, the air pressure value detected by the first sensor corresponds to the displacement distance of the second actuator driving the air needle 3, so as to measure the size of any axial position monitored, and improve the detection range.

[0051] The above is only the preferred embodiment of the present invention, and is not used to limit the implementation scope of the present invention; if the present invention is modified or equivalently replaced without departing from the spirit and scope of the present invention, it should be covered by the protection scope of the claims of the present invention.

Claims

1. A method for detecting the inner hole size of a part based on air pressure value, characterized in that: A detection mechanism is used, the detection mechanism includes a bracket, a workpiece seat, an air needle, a first actuator and a second actuator, the first actuator and the second actuator are arranged on the bracket, the workpiece seat is arranged on the first actuator, the air needle is arranged on the second actuator, the first actuator drives the workpiece seat to move to the detection position, the second actuator drives the air needle to move up and down, the air needle is connected to a first sensor and a voltage stabilizing component, the voltage stabilizing component is used to provide an air source with stable pressure, and the first sensor is used to measure the current air pressure value; at least two air outlet holes are arranged on the side wall of the air needle at equal intervals; a workstation that cooperates with the part is arranged on the upper surface of the workpiece seat, and a circumferentially open air avoidance groove is recessed on the workstation; The following steps are involved: Step 1, rotating the part to the detection mechanism through a rotating disk; Step 2, driving the workpiece seat to lift up by the first actuator to lift the parts on the rotating disk to a detection position; Step 3, the second actuator drives the gas needle to move up and down, the gas is ejected from the gas outlet, and the gas pressure value is monitored by the first sensor; Step 4, based on the monitored data, compare it with the pre-stored qualified data range in the computer. If it is within the range, the part is qualified; otherwise, it is unqualified.

2. A method for detecting the inner hole size of a part based on air pressure value according to claim 1, characterized in that: The first actuator is a pneumatic cylinder, and the second actuator is an electric cylinder.

3. The method for detecting the inner hole size of a part based on air pressure value according to claim 1, characterized in that: The air needle is arranged on the second actuator through a first protection component; the first protection component includes a first fixed seat, a first spring and a floating rod, the floating rod is vertically floatingly arranged on the first fixed seat, the first spring is arranged on the floating rod, and the first spring is used to provide a downward thrust for the floating rod. The floating rod is axially provided with an air path passing through it, the air needle is installed at the lower end of the floating rod, and the upper end of the floating rod is connected to the first sensor.

4. A method for detecting the inner hole size of a part based on air pressure value according to claim 3, characterized in that: A first guide hole vertically penetrating the first fixed seat is provided, the floating rod is slidably provided in the first guide hole, a limiting nut is provided at the upper end of the floating rod; a limiting edge is provided at the lower end of the floating rod, and the two ends of the first spring act on the limiting edge and the first fixed seat.

5. The method for detecting the inner hole size of a part based on air pressure value according to claim 1, characterized in that: The second actuator is provided with an adjusting component, the air needle is provided on the adjusting component, and the adjusting component is used to adjust the horizontal position of the air needle.

6. A method for detecting the inner hole size of a part based on air pressure value according to claim 5, characterized in that: The adjustment assembly includes a second fixed seat, a first adjustment block and a second adjustment block, the second fixed seat is arranged on the second actuator, the second fixed seat is provided with a first waist-shaped hole in the X-axis direction, the first adjustment block is arranged on the second fixed seat and fixed to the first waist-shaped hole by a screw, the second adjustment block is provided with a second waist-shaped hole in the Y-axis direction, the second adjustment block is arranged on the first adjustment block, the screw passes through the second waist-shaped hole to fix the first adjustment block and the second adjustment block, and the air needle is connected to the second adjustment block.

7. A method for detecting the inner hole size of a part based on air pressure value according to claim 6, characterized in that: A fixing plate is arranged on the side of the second fixing seat, and a first adjusting screw is arranged on the fixing plate. The first adjusting screw acts on the first adjusting block, and the first adjusting screw is used to push the first adjusting block to move along the X-axis; an adjusting screw hole is arranged on the second adjusting block, and a second adjusting screw is arranged on the adjusting screw hole, and one end of the second adjusting screw acts on the second fixing seat, and the second adjusting screw is used to push the second adjusting block to move along the Y-axis.

8. The method for detecting the inner hole size of a part based on air pressure value according to claim 1, characterized in that: The first actuator is arranged on the bracket through an adjustment plate, and third waist-shaped holes are arranged on both sides of the surface of the adjustment plate. The adjustment plate is fixed to the bracket by screws, and the position of the adjustment plate in the Z-axis direction is adjusted by using the third waist-shaped holes.

9. A method for detecting the inner hole size of a part based on air pressure value according to claim 8, characterized in that: The workpiece seat is arranged on the first actuator through a second protection component, and the second protection component includes a third fixed seat, a first limit block, a second limit block and a second spring. The third fixed seat is arranged on the first actuator, and a second guide hole matching the workpiece seat is arranged on the third fixed seat. The first limit block and the second limit block are arranged at the lower end and the middle part, and the second spring is arranged on the workpiece seat, and the second spring is used to provide an upward thrust for the workpiece seat.

10. The method for detecting the inner hole size of a part based on air pressure value according to claim 1, characterized in that: An axial exhaust passage is arranged between two adjacent air outlet holes.

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