A Sensor Airtightness Detection Device and Method

Abstract

The present invention discloses a sensor airtightness detection device and method, including a carrier, a material pressing mechanism and a detection mechanism. A sensor placement groove is provided on the carrier. The material pressing mechanism is supported above the sensor placement groove. The material pressing mechanism includes a material pressing cylinder and a pressing strip. The pressing strip is driven up and down by the material pressing cylinder. The pressing strip matches the shape of the sensor placement groove. The detection mechanism is arranged on the side of the material pressing mechanism. The detection mechanism includes a Z-axis transfer assembly, a pressure sensor and a pressing rod connected thereto. One end of the pressing rod points to the sensor placement groove, and the other end abuts against the pressure sensor. The present invention changes the internal pressure by extrusion, thereby realizing the detection of the air leakage performance of the sensor by using the pressure change, which is efficient, convenient, has a good detection effect and causes no damage to the sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts detection, and particularly relates to a sensor airtightness detection device and method. Background Art

[0002] With the development of large-scale production of automotive parts, product quality has become the most concerned indicator for many automotive parts manufacturing enterprises. The ability to ensure quality is the core force determining the sustainable development of an enterprise.

[0003] In the automotive industry, most parts are purchased externally, and the detection and assurance of the quality of externally purchased parts have become an important link. Sensor products belong to one of the key safety parts of automobiles. The sensor is wrapped in a rubber sheath. The structure of the sensor is strip-shaped. One end of the sensor is connected with a lead wire. The sensor is hermetically wrapped by the rubber sheath. The airtightness of the rubber sheath needs to be 100% qualified. If the airtightness fails to meet the requirements, problems such as water ingress into the sensor will occur, directly affecting the function realization of the product, causing the sensor to malfunction and the safety system to be damaged, seriously affecting driving safety. Therefore, the airtightness detection of the rubber sheath is essential.

[0004] Currently, there is no airtightness detection device for rubber sheaths in enterprises. The sensors cannot be effectively quality-controlled. Assembly is directly carried out without detecting the airtightness, resulting in unqualified airtightness products flowing into the market and causing premature failure of the products. The existing detection method only conducts spot checks after the assembly of the product assembly, and conducts a water pressure seal test in the laboratory, with low efficiency; moreover, the products cannot be used again after the test and are directly scrapped, causing waste. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a sensor airtightness detection device and method to improve the detection efficiency of the rubber sheath of the sensor.

[0006] To solve the above technical problem, the present invention provides a sensor airtightness detection device, including a carrier, a material pressing mechanism, and a detection mechanism. A sensor placement groove is provided on the carrier. The material pressing mechanism is supported above the sensor placement groove. The material pressing mechanism includes a material pressing cylinder and a pressing strip. The pressing strip is driven up and down by the material pressing cylinder. The pressing strip matches the shape of the sensor placement groove. The detection mechanism is arranged on the side of the material pressing mechanism. The detection mechanism includes a Z-axis transfer assembly and a pressure sensor and a pressing rod connected thereto. One end of the pressing rod points to the sensor placement groove, and the other end abuts against the pressure sensor.

[0007] Further, the material pressing mechanism is located above the middle of the sensor placement groove, and the detection mechanism is located on both sides of the material pressing mechanism.

[0008] Further, a lead placement groove is also provided on the carrier, one side of the lead placement groove is connected with a label placement groove, and label suction holes are communicated in the label placement groove.

[0009] Further, a barcode scanner is provided on one side of the pressure feeding cylinder, and the barcode scanner corresponds to the position of the label placement groove.

[0010] Further, a destruction mechanism is provided outside one of the detection mechanisms, and the destruction mechanism corresponds to the outside of one end of the carrier.

[0011] Further, the center of the pressing strip is hinged to the pressure feeding cylinder.

[0012] Further, the carrier is arranged on a turntable mechanism, and two carriers are symmetrically arranged at the center on the turntable mechanism.

[0013] Further, the turntable mechanism includes a turntable, a gear, a rack and a transmission cylinder. The turntable is coaxially connected with the gear, the gear is matched with the rack, and the rack is pushed back and forth by the transmission cylinder.

[0014] Further, at least one sensor placement groove is arranged in parallel on the carrier, and the pressure feeding mechanism and the detection mechanism are driven by an X-axis transfer mechanism to cooperate with different sensor placement grooves.

[0015] A method for detecting the air tightness of a sensor includes the following steps:

[0016] Measure the pressure P1 required when pressing down the sensor by a distance d in the natural state;

[0017] Squeeze a part of the sensor, and measure the pressure P2 required when pressing down the sensor by the above distance d in this state;

[0018] Compare the difference between P1 and P2 to judge whether the sensor leaks air.

[0019] The beneficial effects of a sensor air tightness detection device and method of the present invention compared with the prior art are that by squeezing to change the internal pressure, the air tightness performance of the sensor can be detected by using the pressure change, which is efficient and convenient, has a good detection effect, and does not damage the sensor. Description of the Drawings

[0020] Figure 1 is the overall structural schematic diagram of the present invention;

[0021] Figure 2 is the top view of the present invention;

[0022] Figure 3 is the schematic diagram of the turntable mechanism of the present invention;

[0023] Figure 4 It is an enlarged view of the blank holding mechanism of the present invention;

[0024] Figure 5 It is a schematic diagram of the detection mechanism of the present invention. Specific Embodiments

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the specific embodiments cited shall not be construed as limiting the present invention.

[0026] Referring to Figure 1 shown, it is a schematic diagram of the overall structure of an embodiment of a sensor airtightness detection device of the present invention. This device includes a carrier 10, a blank holding mechanism 20 and a detection mechanism 30. The carrier 10 is used to carry the sensor to be detected. First, the detection mechanism 30 presses the sensor in its natural state placed on the carrier 10 down by a certain distance for pressure detection. Then, the blank holding mechanism 20 squeezes the sensor. Since the gas inside the sensor transfers to the un-squeezed part after being squeezed, at this time, the un-squeezed part of the sensor is pressed down by the same distance. If the sensor is airtight, the pressure value detected the second time should be greater than the pressure value measured the first time, and the difference between the two can be estimated. If the difference between the two does not reach the expected value, it can be determined that the sensor is leaking air.

[0027] Specifically, referring to Figure 2 shown, a sensor placement groove 11 is provided on the carrier 10, and the sensor is placed in this sensor placement groove 11. To fix the sensor, sensor suction holes 12 are provided in the sensor placement groove 11, and the sensor is adsorbed in the sensor placement groove 11 through the sensor suction holes 12. Since the sensor is also connected with a lead wire, to fix the lead wire, a lead wire placement groove 13 is further provided on the carrier 10. After the sensor is completely placed in the sensor placement groove 11, the lead wire winds back from outside the carrier 10, and one end of the lead wire is placed in the lead wire placement groove 13. Further, to determine the placement position of the lead wire and prevent the label position on the lead wire from being unfixed and interfering with the detection, a label placement groove 14 is connected to one side of the lead wire placement groove 13, and label suction holes 15 communicate with the label placement groove 14. At this time, the label position is fixed and the label is adsorbed and laid flat in the label placement groove 14, which is convenient for scanning the label. A barcode scanner 60 corresponds to the position of the label placement groove 14 and is arranged on one side of the blank holding mechanism 20. When it is detected that the sensor has good airtightness, the barcode scanner 60 scans the label from above, while for the products with unqualified airtightness, no scanning operation is performed.

[0028] Referring to Figure 1 and Figure 2As shown, in another embodiment of the present invention, to improve work efficiency, at least one sensor placement groove 11 is provided in parallel on one of the carriers 10. In this embodiment, two sensor placement grooves 11 are provided on the carrier 10. To operate the sensors in the two sensor placement grooves 11, the material pressing mechanism 20 and the detection mechanism 30 are driven by the X-axis transfer mechanism 40 to cooperate with different sensor placement grooves 11. In this embodiment, the X-axis transfer mechanism 40 includes a transfer plate 41, transfer guide rails 42, and a transfer cylinder 43. The material pressing mechanism 20 and the detection mechanism 30 are arranged on the transfer plate 41. The transfer guide rails 42 are supported below both ends of the transfer plate 41. The transfer cylinder 43 pushes the transfer plate 41 to move along the direction of the transfer guide rails 42, thereby pushing the material pressing mechanism 20 and the detection mechanism 30 to cooperate with the sensor placement grooves 11 at different positions.

[0029] Referring to Figure 3 As shown, in another embodiment of the present invention, to further improve work efficiency, the carrier 10 is arranged on a turntable mechanism 50, and two carriers 10 are symmetrically arranged about the center on the turntable mechanism 50. When the material pressing mechanism 20 and the detection mechanism 30 operate on one carrier 10, the other carrier 10 rotates out of the range of the material pressing mechanism 20 and the detection mechanism 30, so as to facilitate the loading and unloading operations of this carrier 10. At this time, the two carriers 10 respectively perform the loading and unloading and detection operations, doubling the work efficiency. Since the purpose of improving work efficiency can be achieved with two carriers 10, and the divider is suitable for providing multiple workstations and the price of the divider is relatively high, the turntable mechanism 50 in this embodiment is driven by a gear 52 and a rack 53. Specifically, the turntable mechanism 50 includes a turntable 51, a gear 52, a rack 53, and a transmission cylinder 54. The turntable 51 is coaxially connected to the gear 52. The gear 52 cooperates with the rack 53. The rack 53 is pushed back and forth by the transmission cylinder 54. When the transmission cylinder 54 pushes the rack 53 out, the rack 53 drives the gear 52 to rotate 180 degrees, and the turntable 51 rotates 180 degrees simultaneously. The two carriers 10 exchange positions, sending the carrier 10 with the sensors already placed below the material pressing mechanism 20 and the detection mechanism 30, and the sensors that have completed the detection are sent out, which is convenient to be removed and replaced with new sensors to be detected. When the transmission cylinder 54 retracts the rack 53, the turntable 51 rotates 180 degrees in the reverse direction, and the two carriers 10 exchange positions again.

[0030] Referring to Figure 4As shown, the blanking mechanism 20 is supported above the sensor placement groove 11. The blanking mechanism 20 includes a blanking cylinder 21 and a pressing strip 22. The pressing strip 22 is driven up and down by the blanking cylinder 21, and the pressing strip 22 is matched with the shape of the sensor placement groove 11. During operation, the blanking cylinder 21 pushes the pressing strip 22 downward. The length of the pressing strip 22 is less than the length of the sensor placement groove 11. Thus, the pressing strip 22 squeezes the sensor, and the gas in the sensor can be squeezed to other positions in the sensor. In this embodiment, the blanking mechanism 20 is arranged above one side of the sensor placement groove 11, and the detection mechanism 30 is arranged above the other side of the sensor placement groove 11.

[0031] In other embodiments of the present invention, the blanking mechanism 20 is located above the middle of the sensor placement groove 11. To ensure that the pressures on both sides of the sensor are balanced when the pressing strip 22 is pressed downward, the center of the pressing strip 22 is hinged to the blanking cylinder 21. Since the pressure is applied from the center of the pressing strip 22, when the forces on both ends of the pressing strip 22 are unbalanced, the pressing strip 22 automatically floats up and down to adjust the pressure. In this embodiment, the detection mechanism 30 is located on both sides of the blanking mechanism 20. Since the two ends of the sensor are injection-molded sealing ends and the possibility of air leakage is the greatest, the gas in the sensor is squeezed towards the two ends, and the pressure difference between the two ends is compared, making it easier to determine whether there is air leakage and which end of the sensor is leaking.

[0032] Refer to Figure 5 As shown, the detection mechanism 30 includes a Z-axis transfer assembly 31, a pressure sensor 32 and a pressing rod 33 connected thereto. One end of the pressing rod 33 points to the sensor placement groove 11, and the other end abuts against the pressure sensor 32. The Z-axis transfer assembly 31 drives the pressure sensor 32 and the pressing rod 33 to move up and down. When the lower part of the pressing rod 33 presses against the sensor, the pressing rod 33 receives a reaction force and presses the pressure sensor 32. The pressure sensor 32 measures the magnitude of the pressure of the pressing rod 33 on the lower sensor. To prevent the impact force when the pressing rod 33 is pressed downward from damaging the pressure sensor 32, a buffer spring 34 is further arranged between the pressing rod 33 and the pressure sensor 32.

[0033] When the present invention is in operation, after placing the sensor to be detected on the vehicle 10, the vehicle 10 is transferred below the material pressing mechanism 20 and the detection mechanism 30. The detection mechanism 30 first presses the sensor down by a certain distance and records the pressure at this time. Then the material pressing mechanism 20 presses down to squeeze the sensor, causing the gas in the sensor to transfer to other positions, so that the pressure of other parts of the sensor increases. At this time, the detection mechanism 30 presses the sensor down by the same distance and records the pressure at this time. The pressure recorded this time should be larger than the pressure when the sensor is not squeezed by a certain value. Compare the difference between the two recorded pressures. If the difference is equivalent to the estimated value, it indicates that the sensor is airtight, and the barcode scanner 60 scans the barcode of the sensor label. If the difference is quite different from the estimated value, it indicates that the sensor is leaking air. To distinguish the unqualified sensors, the unqualified sensors need to be cut off. In this embodiment, a destruction mechanism 70 is provided outside one of the detection mechanisms 30. The destruction mechanism 70 corresponds to the outside of one end of the vehicle 10, specifically corresponding to the end where the lead wire winds back outside the vehicle 10. At this time, a part of the lead wire is outside the vehicle 10, which is convenient for the destruction mechanism 70 to cut off this part. After completing the detection of this sensor, the material pressing mechanism 20 and the detection mechanism 30 move above another sensor through the X-axis transfer mechanism 40 to detect it. After all the sensors on one vehicle 10 are detected, the turntable 51 rotates to send another vehicle 10 below the material pressing mechanism 20 and the detection mechanism 30 to repeat the detection operation.

[0034] The present invention also provides a method for detecting the airtightness of a sensor, including the following steps:

[0035] Measure the pressure P1 required to press the sensor down by a distance d in the natural state; that is, measure the pressure required to press the sensor down by a distance d when the sensor is not subject to any operation. At this time, the inside of the sensor is connected, and the pressure required to press the sensor down by a distance d is small.

[0036] Squeeze a part of the sensor and measure the pressure P2 required to press the sensor down by the above distance d in this state; due to being squeezed, the gas in the sensor transfers to other parts, making the pressure of other parts of the sensor increase. At this time, the pressure required to press the sensor down by the same distance d is large.

[0037] If the sensor is airtight, the difference between P1 and P2 is a fixed value. Therefore, compare the difference between P1 and P2. If the difference is approximately equal to this fixed value, it is determined that the sensor is airtight, and the barcode scanner is used to scan and record the sensor. If the difference is quite different from this fixed value, it is determined that the sensor is leaking air, and the lead wire of the sensor is cut off by the destruction mechanism for distinction to complete the detection of the sensor.

[0038] The above-described embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A sensor airtightness detection device, characterized in that, It includes a vehicle, a material pressing mechanism and a detection mechanism. A sensor placement groove is provided on the vehicle. The material pressing mechanism is supported above the sensor placement groove. The material pressing mechanism includes a material pressing cylinder and a pressing strip. The pressing strip is driven up and down by the material pressing cylinder. The pressing strip matches the shape of the sensor placement groove. The detection mechanism is arranged on the side of the material pressing mechanism. The detection mechanism includes a Z-axis transfer assembly, a pressure sensor and a pressing rod connected thereto. One end of the pressing rod points to the sensor placement groove, and the other end abuts against the pressure sensor. A buffer spring is further arranged between the pressing rod and the pressure sensor; First, the detection mechanism presses the sensor in its natural state, which is placed on the vehicle, down by a certain distance for pressure detection. Then, the sensor is extruded by the material pressing mechanism. Since the gas in the sensor transfers to the unextruded part after being extruded, at this time, the unextruded part of the sensor is pressed down by the same distance. If the sensor is airtight, the pressure value detected for the second time should be greater than the pressure value measured for the first time, and the difference between the two can be estimated. If the difference between the two does not reach the expected value, it can be determined that the sensor is air leaking; The material pressing mechanism is located above the middle of the sensor placement groove, and the detection mechanism is located on both sides of the material pressing mechanism, squeezing the gas in the sensor to both ends and comparing the pressure difference at both ends to determine whether the sensor is air leaking and which end of the sensor is air leaking.

2. The airtightness detection device for a sensor according to claim 1, characterized in that, A lead placement groove is further provided on the vehicle. One side of the lead placement groove is connected to a label placement groove, and label suction holes are communicated in the label placement groove.

3. The airtightness detection device for a sensor according to claim 2, characterized in that, A barcode scanner is arranged on one side of the material pressing cylinder, and the barcode scanner corresponds to the position of the label placement groove.

4. A sensor airtightness detection device according to claim 1, characterized in that, A destruction mechanism is arranged outside one of the detection mechanisms, and the destruction mechanism corresponds to the outside of one end of the vehicle.

5. The airtightness detection device for a sensor according to claim 1, characterized in that, As described in claim 1, a sensor airtightness detection device, wherein the center of the pressing strip is hinged to the material pressing cylinder.

6. The airtightness detection device for a sensor according to claim 1, characterized in that The vehicle is arranged on a turntable mechanism, and two vehicles are symmetrically arranged at the center on the turntable mechanism.

7. The airtightness detection device for a sensor according to claim 6, characterized in that, The turntable mechanism includes a turntable, a gear, a rack and a transmission cylinder. The turntable is coaxially connected to the gear. The gear cooperates with the rack, and the rack is pushed back and forth by the transmission cylinder.

8. The airtightness detection device for a sensor according to claim 1, wherein At least one sensor placement groove is arranged in parallel on the vehicle. The material pressing mechanism and the detection mechanism are driven by an X-axis transfer mechanism to cooperate with different sensor placement grooves.

9. A method for detecting the airtightness of a sensor, characterized in that, It includes the following steps: Measure the pressure P1 required to press the sensor down by a distance d in its natural state; Extrude a part of the sensor and measure the pressure P2 required to press the sensor down by the above distance d in this state; Compare the difference between P1 and P2 to determine whether the sensor is air leaking.

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