Hole site detection device for automobile air bag restraint system shell

Abstract

The invention discloses a hole site detection device for an automobile safety air bag shell. The hole site detection device comprises a bottom plate, a workbench, a clamping mechanism, a positioning column, a lifting mechanism, a driving frame, a sliding table, a hole site detection mechanism and a hole diameter detection mechanism. The workbench is used for placing a workpiece, the position of the workpiece is fixed through the clamping mechanism, the positioning column is matched with a center hole of the workpiece for positioning, and the lifting mechanism controls the positioning column to ascend and descend so as to achieve clamping and discharging. The sliding table is installed on the driving frame and controlled by the driving frame to move left and right, and station switching between the hole site detection mechanism and the hole diameter detection mechanism is achieved. The hole site detection mechanism drives a hole site detection pin to descend to detect the hole site of the workpiece through a second electric telescopic rod, if the hole site is qualified, the hole site detection pin is smoothly inserted, otherwise, a pressure sensor identifies an unqualified signal; the sliding block and the adjusting block are matched with the guide rail and the lead screw to ensure stable movement of the sliding table, the guide plate is used for automatic discharging after detection, and double detection of the hole site and the hole diameter of the workpiece is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of detection equipment, in particular to a hole position detection device for a car safety airbag housing. Background Art

[0002] With the development of the automotive industry, the quality inspection of automotive airbags, as an important passive safety device, has become more and more stringent. Airbag housings usually require multiple precise hole positions and apertures to meet assembly and functional requirements. If the hole position or aperture size on the housing does not meet the tolerance requirements of the design drawings, it may cause the installation and function of the airbag to fail, seriously affecting the safety performance of the vehicle. Therefore, it is particularly important to perform efficient and accurate hole position and aperture inspection on the airbag housing.

[0003] Traditional hole position and aperture detection mainly rely on manual operation or single detection equipment. These methods have some defects: first, manual detection is inefficient and easily affected by human factors, resulting in a high error rate; second, some traditional detection equipment cannot detect hole position and aperture at the same time, and two detection processes need to be performed separately, which increases detection time and labor costs. In addition, traditional equipment is not accurate enough in judging the aperture tolerance range, which can easily lead to misjudgment of the detection results. Summary of the invention

[0004] In order to solve the above problems, the present application provides a device for detecting the hole position of an automobile airbag housing, which adopts the following technical solution: A device for detecting a hole position of an automobile airbag housing comprises a base plate, a workbench is arranged above the base plate, and legs for fixing and supporting the workbench are fixed near four corners on the upper surface of the base plate, a workpiece is placed on the upper surface of the workbench, and clamping mechanisms for clamping the workpiece are fixed near left and right sides of the upper surface of the workbench, a material guide plate is fixed on the rear side of the workbench, a positioning column for positioning the workpiece is vertically inserted through the center of the workbench, and a lifting mechanism for driving the positioning column to lift and lower is arranged on the lower side of the workbench, driving frames are fixed near front and rear sides of the upper surface of the workbench, and a slide table that can slide left and right is installed between the upper ends of the front and rear driving frames, an aperture detection mechanism and a hole position detection mechanism that can be lifted and lowered are respectively installed near left and right sides of the lower side of the slide, and the driving frame drives the slide table to move left and right to perform station rotation of the aperture detection mechanism and the hole position detection mechanism In another embodiment, the aperture detection mechanism comprises a first electric telescopic rod fixed on the slide, the lower end of the top rod of the first electric telescopic rod passes through the slide and is fixed with a first lifting plate, and a first guide plate is arranged below the first lifting plate, a shell is fixed between the first lifting plate and the first guide plate, and a second aperture detection pin and a plurality of first aperture detection pins are installed on the lower surface of the first guide plate, the outer diameters of the second aperture detection pin and the first aperture detection pin are slightly larger than the upper limit size of the aperture of the detected hole, and the hole position detection mechanism comprises a second electric telescopic rod fixed on the slide, the lower end of the top rod of the second electric telescopic rod passes through the slide and is fixed with a second lifting plate, and a second guide plate is arranged below the second lifting plate, two left and right connecting blocks are fixed between the second lifting plate and the second guide plate, and a plurality of hole position detection pins are installed on the lower surface of the second guide plate, and the outer diameter of the hole position detection pin is slightly larger than the lower limit size of the aperture of the detected hole.

[0005] Furthermore, the second aperture detection pin and multiple first aperture detection pins can be movably inserted into the lower surface of the first guide plate up and down, the upper ends of the second aperture detection pin and multiple first aperture detection pins are fixed with first springs, and the lower surface of the first guide plate is fixed with multiple first pressure sensors corresponding to the first springs.

[0006] Furthermore, multiple second hole position detection pins can be movably inserted into the lower surface of the second guide plate up and down, a second spring is fixed to the upper end of the second hole position detection pin, and a guide sleeve is provided on the outer side of the second spring, and a second pressure sensor is provided on the inner side of the guide sleeve at the upper end of the second spring.

[0007] Furthermore, two left and right sliding blocks are fixed to the front and rear edges of the slide, and an adjustment block fixed to the slide is arranged between the two sliding blocks.

[0008] Furthermore, the driving frame includes two left and right support rods fixed on the workbench, a support plate is fixed between the upper ends of the two support rods, and a guide rail is fixed to the side of the support plate close to the slide, a transverse screw rod is arranged on the upper side of the support plate, and fixing plates for rotatably mounting the two ends of the screw rod are fixed to the upper surface of the support plate close to the left and right ends, and a motor for driving the screw rod to rotate is fixed to one side of one of the fixing plates.

[0009] Furthermore, the lifting mechanism includes a U-shaped frame, an electric lifting rod is fixed to the inner bottom of the U-shaped frame, and a clamping plate is fixed to the upper end of the top rod of the electric lifting rod.

[0010] Furthermore, an adjustment plate is fixed to the lower end of the positioning column, and guide slots for clamping on the side wall of the U-shaped frame are provided on both the left and right sides of the adjustment plate, and a clamping slot is provided on the lower surface of the adjustment plate.

[0011] Furthermore, the clamping mechanism includes a fixed seat fixed on the workbench, a clamping plate is provided on the side of the fixed seat facing the workpiece, and a cylinder is fixed on the other side of the fixed seat, the top rod of the cylinder passes through the fixed seat and is fixedly connected to the clamping plate, and a guide rod passing through the fixed seat is fixed on one side of the clamping plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects: Firstly, the present invention solves the problem of workpiece deviation that is easy to occur during the detection process by positioning the workpiece through the positioning column cooperating with the center hole of the workpiece; at the same time, the clamping mechanism drives the clamping plate through the cylinder to clamp the left and right sides of the workpiece, so that the workpiece remains stable and does not deviate during detection; the lifting mechanism can control the lifting and lowering of the positioning column, so that the workpiece can be smoothly discharged after positioning and detection are completed, thereby improving the flexibility and automation of operation.

[0013] Secondly, the hole position detection mechanism utilizes the second electric telescopic rod to drive the second lifting plate, and detects the acceptability of the hole position of the workpiece through multiple hole position detection pins; when the hole position detection pin can be inserted into the hole, the pressure signal detected by the second pressure sensor indicates that the hole position is qualified, which solves the problems of large error and low efficiency in traditional manual detection; if the hole position is unqualified, the hole position detection pin applies pressure to the second spring, and the second pressure sensor identifies the unqualified signal, realizing automated detection and real-time feedback.

[0014] In addition, the aperture detection mechanism drives the first lifting plate through the first electric telescopic rod, and drives the first aperture detection pin and the second aperture detection pin on the first guide plate to move downward; when the detection pin cannot pass through the hole on the workpiece, it means that the aperture is within the tolerance range, and the first spring transmits the detection pressure to the first pressure sensor to determine whether the aperture is qualified; this design avoids the risk of the workpiece aperture exceeding the tolerance range but not being discovered in time, and greatly improves the accuracy of detection.

[0015] The drive frame controls the left and right movement of the slide table through the support rod, guide rail and motor, realizing the rapid station conversion between hole position detection and aperture detection; this design avoids repeated handling and manual intervention of the workpiece between different detection steps, and improves the detection efficiency. At the same time, the design of the slider and the adjustment block ensures the smooth movement of the slide table, avoiding the impact of unstable sliding on the detection accuracy.

[0016] Finally, after the inspection is completed, the automatic discharge of the workpiece is realized through the discharge guide design of the guide plate, avoiding the tedious operation of manual pick-up and placement of the workpiece, and improving work efficiency. This design that integrates positioning, clamping, inspection and discharge not only improves the inspection accuracy and efficiency, but also reduces the difficulty of operation and labor costs.

[0017] In summary, the device effectively solves the problems of low efficiency, high error and much manual intervention in traditional detection methods through innovative structural design and multiple automated control methods, and provides an efficient and reliable solution for the detection of automobile airbag housings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a three-dimensional diagram of a hole position detection device for a car airbag housing according to the present invention; Figure 2 It is a schematic diagram of the cooperation state of a slide table, an aperture detection mechanism and a hole position detection mechanism of a hole position detection device for a housing of an automobile safety airbag shown in the present invention; Figure 3 It is a schematic diagram of an aperture detection mechanism of a hole position detection device for an automobile airbag housing shown in the present invention; Figure 4 It is a schematic diagram of a hole position detection mechanism of a hole position detection device for a housing of an automobile safety airbag shown in the present invention; Figure 5 It is a schematic diagram of a slide table of a hole position detection device for an automobile airbag housing shown in the present invention; Figure 6 It is a schematic diagram of a driving frame of a hole position detection device for a vehicle airbag housing shown in the present invention; Figure 7 It is a schematic diagram of a lifting mechanism of a hole position detection device for an automobile airbag housing shown in the present invention; Figure 8 It is a schematic diagram of a positioning column of a hole position detection device for an automobile airbag housing shown in the present invention; Fig. 9 The present invention is a schematic diagram of a clamping mechanism of a hole position detection device for an automobile airbag housing.

[0020] In the figure: 1, bottom plate; 2, supporting legs; 3, guide plate; 4, workbench; 5, aperture detection mechanism; 51, first electric telescopic rod; 52, first lifting plate; 53, first pressure sensor; 54, housing; 55, first guide plate; 56, first aperture detection pin; 57, second aperture detection pin; 58, first spring; 6, slide; 61, slider; 62, adjustment block; 7, hole position detection mechanism; 71, second electric telescopic rod; 72, second lifting plate; 73, second pressure sensor; 74, second guide plate ;75. Hole detection pin;76. Guide sleeve;77. Second spring;78. Connecting block;8. Drive frame;81. Support rod;82. Fixing plate;83. Support plate;84. Screw rod;85. Guide rail;86. Motor;9. Positioning column;91. Adjusting plate;92. Guide slot;93. Card slot;10. Lifting mechanism;101. U-shaped frame;102. Electric lifting rod;103. Card plate;11. Clamping mechanism;111. Cylinder;112. Guide rod;113. Fixed seat;114. Clamp. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0022] Embodiment 1: See also Figure 1-9, a hole position detection device for an automobile airbag housing, comprising a base plate 1, a workbench 4 is arranged above the base plate 1; legs 2 are fixed near the four corners on the upper surface of the base plate 1 for supporting and fixing the workbench 4; the legs 2 ensure that the workbench 4 remains stable during the detection process to avoid vibration or offset affecting the detection accuracy. The upper surface of the workbench 4 is used to place the workpiece, and clamping mechanisms 11 are fixedly installed near the left and right sides for stable clamping of the workpiece; the clamping mechanism 11 ensures the precise position of the workpiece during the detection process to avoid offset by synchronous clamping on the left and right sides; a guide plate 3 is also arranged on the rear side of the workbench 4 for the smooth discharge and guidance of the workpiece after the detection, thereby realizing automatic material discharge. A positioning column 9 is vertically inserted in the center of the workbench 4, which is used to accurately position the center of the workpiece; the positioning column 9 cooperates with the hole of the workpiece to fix the workpiece in the specified position to prevent the position offset from affecting the detection result; the lifting and lowering of the positioning column 9 is controlled by the lifting mechanism 10 arranged on the lower side of the workbench 4, ensuring flexible adjustment during workpiece positioning and material discharge, and being able to control the positioning column 9 to be retracted downward during material discharge without causing obstruction to the workpiece during material discharge. The upper surface of the workbench 4 is fixedly installed with a drive frame 8 near the front and rear sides; a slide 6 that can slide left and right is installed between the upper ends of the two drive frames 8, and the left and right movement of the slide 6 realizes the detection station conversion between the hole position detection mechanism 7 and the aperture detection mechanism 5, thereby improving the detection efficiency.

[0023] See also Figure 1-5 The aperture detection mechanism 5 includes a first electric telescopic rod 51 fixed on the slide 6; the lower end of the top rod of the first electric telescopic rod 51 passes through the slide 6 and is fixed with a first lifting plate 52 for controlling the lifting of the aperture detection mechanism; a first guide plate 55 is installed below the first lifting plate 52 to ensure that the detection pin remains stable and does not deviate during the up and down movement; the first lifting plate 52 and the first guide plate 55 are fixedly connected by a shell 54 to provide a stable support structure; on the lower surface of the first guide plate 55, a plurality of first aperture detection pins 56 and a second aperture detection pin 57 are installed; the outer diameters of these detection pins are slightly larger than the upper limit size of the detected hole, so as to judge whether the aperture exceeds the tolerance range during the detection process; the upper ends of the first aperture detection pin 56 and the second aperture detection pin 57 are fixed with a first spring 58 to ensure that the first aperture detection pin 56 and the second aperture detection pin 57 rebound and reset; one end of the first spring 58 is connected to a plurality of first pressure sensors 53, and the sensor is used to sense the change of spring pressure and judge whether the aperture of the workpiece is qualified.

[0024] See also Figure 4-5The hole position detection mechanism 7 includes a second electric telescopic rod 71 fixed on the slide 6; the lower end of the top rod of the second electric telescopic rod 71 passes through the slide 6 and is fixed with a second lifting plate 72; a second guide plate 74 is installed below the second lifting plate 72 to ensure the smooth movement of the hole position detection pin 75 during the detection process; the second lifting plate 72 and the second guide plate 74 are fixedly connected by two left and right connecting blocks 78 to provide structural stability; a plurality of hole position detection pins 75 are installed on the lower surface of the second guide plate 74, the outer diameter of these detection pins is slightly larger than the lower limit size of the detected hole, which is used to determine whether the hole position is within the tolerance range; the upper ends of the plurality of hole position detection pins 75 are fixed with second springs 77 for rebound reset; the outer cover of the second spring 77 is provided with a guide sleeve 76, and the upper end of the guide sleeve 76 is installed with a second pressure sensor 73 for sensing the pressure change of the spring during the hole position detection process and determining whether the hole position is qualified.

[0025] See also Figure 5 Two left and right sliders 61 are fixed to the front and rear edges of the slide 6; the sliders 61 cooperate with the guide rails 85 on the drive frame 8 to ensure that the slide 6 remains stable and smooth when moving left and right; an adjustment block 62 is installed between the sliders 61, and the adjustment block 62 can be adjusted by the drive of the screw rod 84. The adjustment block 62 is driven to move left and right by the rotation of the screw rod 84, and the adjustment block 62 that moves left and right drives the slide 6 to move left and right, thereby converting the detection positions of the hole position detection mechanism 7 and the aperture detection mechanism 5.

[0026] See also Figure 6 The driving frame 8 includes two left and right support rods 81 fixed on the workbench 4; a support plate 83 is fixed between the upper ends of the two support rods 81, and a guide rail 85 is fixed on the side of the support plate 83 close to the slide 6 for the left and right movement of the slide 6; a transverse screw rod 84 is installed on the upper side of the support plate 83, and one end of the screw rod 84 is connected to a motor 86; the motor 86 drives the screw rod 84 to rotate, and the left and right movement of the slide 6 is realized by adjusting the position of the screw rod 84 to drive the adjustment block 62.

[0027] See also Figure 7 The lifting mechanism 10 includes a U-shaped frame 101; an electric lifting rod 102 is fixed to the inner bottom of the U-shaped frame 101, and a clamping plate 103 is fixed to the upper end of the top rod of the electric lifting rod 102; the electric lifting rod 102 is fixed by the clamping connection between the clamping plate 103 and the positioning column 9, and the clamping plate 103 is used to fix the position of the positioning column 9, thereby ensuring the stability of the workpiece during the detection process.

[0028] See also Figure 7-8An adjusting plate 91 is fixed to the lower end of the positioning column 9; guide slots 92 are provided on the left and right sides of the adjusting plate 91, and the slots 92 are engaged with the side walls of the U-shaped frame 101 to ensure that the positioning column 9 is stable during the lifting process; a card slot 93 is provided on the lower surface of the adjusting plate 91 for cooperating with the fixation of the card plate 103.

[0029] See also Fig. 9 The clamping mechanism 11 includes a fixed seat 113 fixed on the workbench 4; a clamping plate 114 is provided on the side of the fixed seat 113 facing the workpiece, and the clamping plate 114 is used to clamp the side of the workpiece to ensure that the workpiece does not move during the detection process; a cylinder 111 is fixed on the other side of the fixed seat 113, and the top rod of the cylinder 111 passes through the fixed seat 113 and is fixedly connected to the clamping plate 114 to realize the telescopic control of the clamping plate 114; a guide rod 112 that passes through the fixed seat 113 is fixed on one side of the clamping plate 114, and the guide rod 112 ensures the stability and accuracy of the clamping plate 114 during the movement.

[0030] Working principle: When the hole position detection of the workpiece is carried out, the workpiece is placed on the positioning column 9 by using the hole in the center thereof to locate the position when placed. At this time, the clamping mechanisms 11 on the left and right sides are used to clamp the straight edges on the left and right sides of the workpiece to complete the alignment and positioning clamping of the workpiece. At this time, the hole position detection mechanism 7 is lowered to detect the hole positions of the remaining holes. After the hole position detection is completed, the driving frame 8 is used to drive the slide 6 to move to the right so that the aperture detection mechanism 5 enters the detection station. At this time, the aperture detection mechanism 5 descends to detect the aperture of the workpiece, thereby completing the double detection of the hole position and aperture of the workpiece. After the detection is completed, the clamping mechanism 11 is released, and the lifting mechanism 10 drives the positioning column 9 to descend and retract. At this time, the workpiece can be directly pushed out of the workbench 4 and the guide plate 3 can be used for material discharge and material guiding; When the hole position detection of the workpiece is performed, the second electric telescopic rod 71 drives the second lifting plate 72 to descend and drives the second guide plate 74 and the hole position detection pin 75 to descend. When the hole position of the workpiece is qualified, the hole position detection pin 75 can be inserted into the remaining holes. If the hole position is unqualified, the hole position detection pin 75 cannot be inserted into the corresponding hole. At this time, the hole position detection pin 75 that cannot be lowered applies pressure to the second spring 77, and the second spring 77 applies pressure to the second pressure sensor 73. The second pressure sensor 73 is used to detect the change in pressure to obtain hole position detection information. The outer diameter of the hole position detection pin 75 is slightly larger than the lower limit size of the hole diameter of the detected hole. When the hole position detection pin 75 can be inserted into the hole, it can be determined that the hole diameter is larger than the lower limit of the size tolerance of the hole required by the drawing, thereby determining that the hole diameter does not exceed the size tolerance range of the hole required by the drawing. When the aperture is detected, the first electric telescopic rod 51 drives the first lifting plate 52 to descend and drives the first guide plate 55 to descend. The descending first guide plate 55 drives the first aperture detection pin 56 and the second aperture detection pin 57 to descend. When the aperture of the workpiece is qualified, the first aperture detection pin 56 and the second aperture detection pin 57 cannot pass through the hole on the workpiece. At this time, the first aperture detection pin 56 and the second aperture detection pin 57 both apply pressure to the first spring 58, and the first spring 58 applies pressure to the first pressure sensor 53. If the first aperture detection pin 56 or the second aperture detection pin 57 passes through the hole of the workpiece, the corresponding first pressure sensor 53 cannot recognize the pressure signal, and the pressure signals of multiple first pressure sensors 53 are used to detect the aperture detection information. The outer diameters of the second aperture detection pin 57 and the first aperture detection pin 56 are slightly larger than the upper limit size of the aperture of the detected hole. When the first aperture detection pin 56 or the second aperture detection pin 57 can pass through the hole of the workpiece, it can be determined that the aperture of the detected hole exceeds the upper limit of the size tolerance of the hole required by the drawing. When the slide 6 is moved and adjusted, the motor 86 drives the screw rod 84 to rotate, and the rotating screw rod 84 drives the adjustment block 62 to drive the slide 6 to move, thereby completing the conversion between the hole position detection and the hole diameter detection of the workpiece.

[0031] Embodiment 2: Stability test of positioning column and cylinder clamping In order to verify the effectiveness of the positioning column combined with the cylinder clamping mechanism of the present invention in maintaining the stability of the workpiece, The following experiments were conducted: Experimental equipment and materials: 1. Positioning column model: LPZ-100 2. Cylinder model: QG-25, rated air pressure 0.8 MPa 3. Workpiece material: Aluminum alloy (model 6061-T6) 4. Test platform: XYZ-30 precision translation stage Experimental steps: 1. Put the aluminum alloy workpiece on the positioning column and use the cylinder of the clamping mechanism to clamp the left and right sides of the workpiece.

[0032] 2. Apply lateral vibrations of different amplitudes (frequencies of 5 Hz, 10 Hz, 15 Hz, 20 Hz, and 25 Hz) to the workbench to simulate the vibration environment that the workpiece may encounter during the inspection process.

[0033] 3. Use displacement sensors to measure the displacement of the workpiece during vibration.

[0034] Experimental data: displacement standard deviation (μm)

[0036] The experimental results show that with the increase of vibration frequency, the lateral displacement of the workpiece increases, but the overall displacement is kept within 2.5μm, which proves that the positioning column and cylinder clamping mechanism can effectively maintain the stability of the workpiece, thereby ensuring the detection accuracy.

[0037] Where A is the amplitude and ω is the angular frequency Formula: Displacement caused by vibration Δx=A*sin(ω)(2πf), t is time.

[0038] Example 3: Experiment on the automated detection accuracy of hole position detection mechanism In order to verify the automatic detection accuracy of the hole position detection mechanism in the present invention, the following experiments were designed: Experimental equipment and materials: 1. Second electric telescopic rod model: ESR-150 2. Hole detection pin material: high carbon steel, outer diameter accuracy ±0.01mm 3. Workpiece hole diameter: 10mm, tolerance ±0.1mm 4. Pressure sensor model: PTS-350, accuracy 0.01N Experimental steps: 1. Place the workpiece with a hole diameter of 10mm on the workbench and position it using the positioning column.

[0039] 2. Use the hole position detection mechanism to descend and detect whether the pin is inserted into the workpiece hole.

[0040] 3. Use a pressure sensor to detect pressure changes during the insertion process and record the pass status of the hole position detection.

[0041]

[0042] The experimental results show that when the hole diameter is within the tolerance range, the detection pin can be inserted smoothly and the pressure sensor reading is small (<0.2N); when the hole diameter exceeds the tolerance range, the detection pin cannot be inserted and the pressure increases significantly. This shows that the hole position detection mechanism can accurately identify whether the hole position is qualified. Formula: Pressure F=k*Δx Where k is the spring stiffness coefficient and Δx is the compression displacement of the spring. Example 4: Tolerance judgment experiment of the hole diameter detection mechanism In order to verify the accuracy of the aperture detection mechanism of the present invention in judging the aperture tolerance of the workpiece, the following experiments were conducted: Experimental equipment and materials: 1. The first electric telescopic pole model: ESR-120 2. Aperture detection pin specifications: ∅10.20mm, ∅10.25mm 3. Workpiece hole diameter: 10 mm, tolerance ±0.1mm 4. The first pressure sensor model: PTS-350, accuracy 0.01N Experimental steps: 1. Use the first electric telescopic rod to drive the aperture detection pin to descend and detect the aperture of the workpiece.

[0043] 2. When the test pin cannot pass through the workpiece hole, record the pressure sensor reading.

[0044] 3. Test workpieces within 5 different tolerance ranges.

[0045]

[0046] The experimental results show that when the hole diameter is within the tolerance range, the detection pin can pass smoothly; when the hole diameter exceeds the tolerance range, the pressure increases significantly and the detection cannot be passed. This shows that the aperture detection mechanism can effectively determine whether the workpiece hole diameter is qualified and has a high detection accuracy. Formula: Detection pressure P = F / A, where F is the force and A is the cross-sectional area of ​​the hole. Example 5: Mobile stability experiment of the drive frame and slide table In order to verify the stability of the cooperation between the drive frame and the slide table of the present invention in realizing the rapid conversion between hole position detection and hole diameter detection, the following experiments were conducted: Experimental equipment and materials: 1. Drive frame support rod model: SP-50 2. Slide table model: ST-200 3. Screw specification: ∅20 mm, pitch 5mm 4. Motor model: EM-500, rated speed 2000 rpm Experimental steps: 1. Install the slide on the drive frame and connect the motor through a screw.

[0047] 2. Drive the slide to move from the hole position detection station to the aperture detection station, and measure the time of each movement and the slide offset. 3. Repeat the movement experiment 5 times and record the relevant data.

[0048]

[0049] The experimental results show that the slide can move quickly and smoothly driven by the drive frame. The time of each movement is controlled within 2.1 seconds, and the offset is kept within 0.6μm, which proves that the movement process of the slide is stable and reliable.

[0050] Formula: Moving speed y = s / second, where s is the distance the slide moves and t is the time required for movement.

[0051] Example 5: Experiment on the automatic discharging efficiency of the guide plate In order to verify the automatic discharging efficiency of the guide plate in the present invention, the following experiment was conducted: Experimental equipment and materials: 1. Guide plate material: stainless steel (model 304) 2. Workpiece material: Aluminum alloy (model 6061-T6) 3. Workpiece weight: 2kg 4. Guide plate inclination: 30° Experimental steps: 1. After the test is completed, the positioning column is retracted through the lifting mechanism, and the workpiece is automatically discharged along the guide plate. 2. Test the discharge time of 5 groups of workpieces. Experimental data:

[0052] The experimental results show that the workpiece can be discharged smoothly under the action of the guide plate, and the discharge time is kept within 1.6 seconds, which proves that the automatic discharge design of the guide plate effectively improves the discharge efficiency.

[0053] Formula: Discharge speed y=d / t, where d is the length of the guide plate and t is the workpiece discharge time.

[0054] The above description is only the preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hole position detection device for an automobile airbag housing, comprising a bottom plate (1), characterized in that: A workbench (4) is arranged above the base plate (1), and legs (2) are fixed to the upper surface of the base plate (1) near four corners for fixing and supporting the workbench (4), a workpiece is placed on the upper surface of the workbench (4), and clamping mechanisms (11) are fixed to the upper surface of the workbench (4) near left and right sides for clamping the workpiece, a guide plate (3) is fixed to the rear side of the workbench (4), a positioning column (9) for positioning the workpiece is vertically inserted through the center of the workbench (4), and a driving positioning column (9) is arranged on the lower side of the workbench (4) for lifting and lowering the workpiece. A lifting mechanism (10) for lowering the workbench (4) is provided, wherein a driving frame (8) is fixed to the upper surface of the workbench (4) near the front and rear sides, and a slide table (6) that can slide left and right is installed between the upper ends of the front and rear driving frames (8). An aperture detection mechanism (5) and a hole position detection mechanism (7) that can be lifted and lowered are respectively installed near the left and right sides of the lower side of the slide table (6). The driving frame (8) drives the slide table (6) to move left and right to perform work position conversion on the aperture detection mechanism (5) and the hole position detection mechanism (7). The aperture detection mechanism (5) includes a first electric The electric telescopic rod (51) is provided with a first lifting plate (52) fixed at the lower end of the top rod of the first electric telescopic rod (51) through the slide table (6), and a first guide plate (55) is arranged below the first lifting plate (52), a housing (54) is fixed between the first lifting plate (52) and the first guide plate (55), and a second aperture detection pin (57) and a plurality of first aperture detection pins (56) are installed on the lower surface of the first guide plate (55), the outer diameters of the second aperture detection pin (57) and the first aperture detection pin (56) are slightly larger than the upper limit size of the aperture of the detected hole, The hole position detection mechanism (7) comprises a second electric telescopic rod (71) fixed on the slide (6); the lower end of the top rod of the second electric telescopic rod (71) passes through the slide (6) and is fixed with a second lifting plate (72); a second guide plate (74) is arranged below the second lifting plate (72); two left and right connecting blocks (78) are fixed between the second lifting plate (72) and the second guide plate (74); and a plurality of hole position detection pins (75) are installed on the lower surface of the second guide plate (74); the outer diameter of the hole position detection pins (75) is slightly larger than the lower limit size of the hole diameter of the detected hole.

2. The automobile airbag housing hole position detection device according to claim 1, characterized in that: The second aperture detection pin (57) and the plurality of first aperture detection pins (56) can be movably inserted into and out of the lower surface of the first guide plate (55); the upper ends of the second aperture detection pin (57) and the plurality of first aperture detection pins (56) are fixed with a first spring (53); and the lower surface of the first guide plate (55) is fixed with a plurality of first pressure sensors (53) corresponding one to one with the first springs (53).

3. The automobile airbag housing hole position detection device according to claim 1, characterized in that: The plurality of second hole position detection pins (75) can be movably inserted into the lower surface of the second guide plate (74) up and down, and a second spring (77) is fixed to the upper end of each of the second hole position detection pins (75), and a guide sleeve (76) is provided on the outer side of the second spring (77), and a second pressure sensor (73) is provided on the inner side of the guide sleeve (76) at the upper end of the second spring (77).

4. The automobile airbag housing hole position detection device according to claim 1, characterized in that: Two left and right sliding blocks (61) are fixed to the front and rear side edges of the sliding table (6), and an adjustment block (62) fixed to the sliding table (6) is arranged between the two sliding blocks (61).

5. The automobile airbag housing hole position detection device according to claim 4, characterized in that: The driving frame (8) comprises two left and right support rods (81) fixed on the workbench (4); a support plate (83) is fixed between the upper ends of the two support rods (81); a guide rail (85) is fixed on the side of the support plate (83) close to the slide table (6); a transverse screw rod (84) is arranged on the upper side of the support plate (83); and fixing plates (82) for rotatably mounting the two ends of the screw rod (84) are fixed on the upper surface of the support plate (83) close to the left and right ends; and a motor (86) for driving the screw rod (84) to rotate is fixed on one side of one of the fixing plates (82).

6. The automobile airbag housing hole position detection device according to claim 1, characterized in that: The lifting mechanism (10) comprises a U-shaped frame (101), an electric lifting rod (102) is fixed to the inner bottom of the U-shaped frame (101), and a clamping plate (103) is fixed to the upper end of the top rod of the electric lifting rod (102).

7. The automobile airbag housing hole position detection device according to claim 6, characterized in that: An adjustment plate (91) is fixed to the lower end of the positioning column (9), and guide slots (92) are provided on both left and right sides of the adjustment plate (91) to be clamped on the side wall of the U-shaped frame (101), and a clamping slot (93) is provided on the lower surface of the adjustment plate (91).

8. The automobile airbag housing hole position detection device according to claim 1, characterized in that: The clamping mechanism (11) comprises a fixed seat (113) fixed on a workbench (4); a clamping plate (114) is provided on one side of the fixed seat (113) facing the workpiece, and a cylinder (111) is fixed on the other side of the fixed seat (113); a push rod of the cylinder (111) passes through the fixed seat (113) and is fixedly connected to the clamping plate (114); and a guide rod (112) penetrating the fixed seat (113) is fixed on one side of the clamping plate (114).

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