Oil seal spring inner packaging detection device

Abstract

This utility model discloses an internal spring insulation testing device for oil seals. A positioning seat is provided on the working platform, and the product is placed on the positioning seat. The positioning seat has a testing area and an indicating unit. The testing area has at least one testing unit. The testing unit moves relative to the product, and the testing unit detects whether the spring inside the product is broken through electromagnetic induction. The testing unit is electrically connected to the indicating unit, which displays the testing result. By using electromagnetic induction through the relative movement of the testing unit and the product, the breakage of the internal spring can be detected. This non-destructive testing method reduces quality inspection costs while improving inspection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of production testing technology, and in particular to a device for testing the inner casing of an oil seal spring. Background Technology

[0002] The main function of the inner spring of an oil seal is to provide continuous compensating force during the use of the seal, ensuring long-term stability of the sealing effect. Its core functions include: 1. Provides initial sealing pressure. During installation, the preload of the spring causes the sealing lip to press tightly against the shaft surface to form an initial seal, preventing media leakage. 2. Automatic compensation for wear and fatigue: As the rubber sealing lip deforms or wears due to long-term friction, high temperature or aging, the elasticity of the spring can continuously apply radial clamping force to compensate for the fatigue loss of the sealing lip and maintain the sealing contact pressure. 3. Resisting vibration and pressure fluctuations: Under mechanical vibration or fluid pressure fluctuations, the spring can stabilize the contact between the sealing lip and the shaft surface, avoiding leakage caused by instantaneous pressure changes. 4. Extends seal life: By continuously compensating for rubber aging, shrinkage, or wear, the spring significantly delays seal failure time. If the spring fails, the rubber lip cannot effectively adhere to the shaft surface, leading to complete seal failure or even equipment malfunction.

[0003] The spring is embedded between the metal skeleton and the rubber coating, utilizing its constant elastic deformation capacity (interference fit design) to form an adaptive adjustment mechanism in dynamic sealing. A typical application is automotive oil seals, with a global annual demand exceeding 7 billion units.

[0004] Springs may break due to various defects. A broken spring will cause the seal to fail to provide continuous compensating force during use, and seals with broken springs are classified as defective. Because oil seal springs are enclosed, they are difficult to detect using conventional testing methods, and sampling inspection is costly and cannot completely eliminate defective products.

[0005] Therefore, how to accurately detect whether a spring is broken while ensuring the integrity of the seal has become a pressing technical challenge. Utility Model Content

[0006] The purpose of this invention is to solve one of the above-mentioned defects and provide an oil seal spring inner packaging detection device.

[0007] The objective of this utility model is achieved through the following means: An oil seal spring internal insulation detection device is provided. A positioning seat is provided on the working platform. The product is placed on the positioning seat. The positioning seat is provided with a detection area and an indicator unit. The detection area is provided with at least one detection unit. The detection unit moves relative to the product. The detection unit detects whether the spring inside the product is broken through electromagnetic induction. The detection unit is electrically connected to the indicator unit, and the indicator unit is used to express the detection result of the detection unit.

[0008] As a preferred embodiment, the positioning seat has a positioning part in the middle, and the detection area is located on the outside of the positioning part, and the product is rotated for detection.

[0009] As a preferred embodiment, the detection area is an annular region surrounding the positioning part.

[0010] As a preferred embodiment, the system also includes a motor, and the positioning base includes a movable part and a fixed part, with the motor used to drive the movable part to rotate.

[0011] As a preferred embodiment, the movable part is located in the middle of the positioning seat, the fixed part is located on the outside of the movable part, and the detection area is located on the fixed part. The movable part is used to position the product and drive the product to rotate. During detection, the product is fitted onto the movable part and rotates with the movable part.

[0012] As a preferred embodiment, the fixing part is a ring-shaped structure sleeved on the outside of the moving part, and the detection area is a ring-shaped area surrounding the moving part.

[0013] As a preferred embodiment, the fixed part is located in the middle of the positioning seat, the movable part is located on the outside of the fixed part, the outer side of the fixed part is provided with a bearing, and the movable part is rotatably connected to the fixed part through the bearing. The detection area is located on the movable part. The fixed part is used to position the product. During detection, the product is placed on the fixed part, and the movable part drives the detection unit to perform a circular motion to detect the product.

[0014] As a preferred embodiment, the movable part is arranged in a ring shape on the outside of the fixed part, and the detection area is a ring-shaped area surrounding the fixed part.

[0015] As a preferred embodiment, the number of detection units is four, and the four detection units are distributed in a ring array along the detection area.

[0016] As a preferred embodiment, the number of the indicator unit is one, and the four detection units are connected in series with the one indicator unit.

[0017] The beneficial effects of this utility model are as follows: 1. By utilizing electromagnetic induction through relative motion between the detection unit and the product, the breakage of the internal spring is detected. This non-destructive testing method reduces quality inspection costs and improves inspection efficiency. 2. By using a motor to rotate the detection area or product, the detection efficiency is significantly improved, and hand fatigue of inspectors is reduced. 3. By equidistantly arranged multiple detection units in a ring, rapid detection is achieved through small-angle rotation, while also preventing quality accidents caused by the malfunction of a single detection unit. 4. By connecting multiple detection units in series with an indicator unit, an indication signal is generated when a spring breakage is detected, enabling multiple measurements and improving the accuracy of inspection results. Attached Figure Description

[0018] Figure 1 This is a top view of the structure of Example 1. Figure 2 This is a cross-sectional schematic diagram of Example 1. Figure 3 This is a schematic cross-sectional view of the product placement in Example 1. Figure 4 This is a schematic diagram of the structure of Example 2. Figure 5 This is a cross-sectional schematic diagram of Example 3. Figure 6 This is a cross-sectional schematic diagram of Example 4. Figure 7 This is a schematic diagram of spring deformation detection in an embodiment. Figure 8 This is a schematic diagram of the detection spring displacement in an embodiment. Explanation of reference numerals in the attached diagram: 10-Working platform; 20-Positioning seat; 21-Positioning part; 22-Detection area; 23-Moving part; 24-Fixed part; 30-Detection unit; 40-Indicating unit; 50-Product; 51-Spring; 51a-Deformed spring; 51b-Displaced spring; 60-Motor; 70-Bearing; 80-Gear. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] To facilitate understanding, the present invention will now be described in further detail with reference to specific implementation examples, but this is not intended to limit the present invention.

[0021] Example 1, as Figure 1-3As shown, this utility model discloses an oil seal spring inner packaging detection device, including a working platform 10, a positioning seat 20 on the working platform 10, a product 50 placed on the positioning seat 20, a detection area 22 and an indicator unit 40 on the positioning seat 20, four detection units 30 in the detection area 22, the detection units 30 and the product 50 generate relative movement, the detection units 30 detect whether the spring 51 inside the product 50 is broken by electromagnetic induction, the detection units 30 are electrically connected to the indicator unit 40, and the indicator unit 40 is used to express the detection result of the detection unit 30.

[0022] The positioning seat 20 has a positioning part 21 in the middle and a detection area 22 is located on the outside of the positioning part 21. The product 50 is rotated for detection.

[0023] In this embodiment, the spring 51 is located on the back side of the sealing lip. The spring 51 is a ring structure and is located inside the product 50 through an integral molding technology. The detection unit 30 is vertically arranged and located below the spring 51. The detection end of the detection unit 30 is close to the lower end of the spring 51. The relative movement between the spring 51 and the detection unit 30 in the product 50 is achieved by manually rotating the product 50, so as to detect whether the spring 51 is broken.

[0024] To improve inspection efficiency and prevent defective products from being shipped out due to malfunction of the detection unit 30, the detection area 22 is an annular area surrounding the positioning part 21. Four detection units 30 are arranged in a circular array along the detection area 22. By equidistantly arranging multiple detection units 30 in a ring, rapid detection is achieved by rotating the product 50 at a small angle. Simultaneously, this avoids quality accidents caused by the malfunction of a single detection unit 30. In this embodiment, only one indicator unit 40 is used, with the four detection units 30 connected in series with one indicator unit 40. By connecting multiple detection units 30 in series with one indicator unit 40, when a breakage is detected in the spring 51, the indicator unit 40 displays an indication signal, enabling multiple measurements and improving the accuracy of the inspection results.

[0025] In this embodiment, the detection unit 30 is a metal proximity switch (inductive proximity switch). Metal proximity switches are a mature, existing technology. Their principle is to detect a break in the spring 51 through electromagnetic induction. An internal oscillating coil generates a high-frequency electromagnetic field. When a metal object enters the magnetic field range, eddy currents are generated on the metal surface, causing a change in the coil inductance or stopping the oscillation. When the broken point of the spring 51 moves to the detection end of the metal proximity switch, it causes a change in the coil inductance. The indicating unit 40 will not receive a signal from the metal proximity switch, and the indicating unit 40 will display a failure indication. Only when none of the four metal proximity switches detect a break in the spring 51 will the indicating unit 40 display a pass indication. For example, if the ring spring 51 breaks, when the product 50 is rotated, and the broken point is above the detection unit 30, the detection unit 30 will sense the break and send a signal, thus achieving the purpose of detecting the break in the spring 51.

[0026] Metal proximity switches (inductive proximity switches) can be purchased, such as the IGXY 12 / 18 / 30 series from Shanghai Taiga.

[0027] The indication unit 40 can provide either sound or color to indicate whether the product 50 is qualified. In this embodiment, the indication unit 40 is an indicator light; green indicates qualification, and red indicates failure. In practical applications, the display unit can also be an external electronic device, such as a computer.

[0028] The number of detection units 30 is not limited to four; it can also be one, two, three, or five. Since the detection units 30 are inductive proximity switches, they may interfere with each other if the distance is too close, which may lead to abnormal detection results. Considering factors such as cost, volume, and distance, four detection units 30 are the preferred choice in this embodiment.

[0029] In practical applications, the detection method of this utility model is also suitable for detecting defective products with deformed or displaced springs 51. For example, the detection of deformed springs 51 is as follows: Figure 7 As shown, the solid line represents the normal spring 51, and the dashed line represents the deformed spring 51a. The deformed part of the deformed spring 51a is not aligned with the detection unit 30. The detection principle is the same as that for detecting whether spring 51 is broken. The detection of defective spring 51 displacement is as follows: Figure 8 As shown, the solid line represents the spring 51 in its normal position, and the dashed line represents the displaced spring 51b. The displaced spring 51b is aligned with the upper detection unit 30, and its detection principle is the same as described above.

[0030] Example 2, as Figure 4As shown, the difference between this embodiment and Embodiment 1 is that it also includes a motor 60. The positioning seat 20 includes a movable part 23 and a fixed part 24. The movable part 23 is located in the middle of the positioning seat 20, and the fixed part 24 is located on the outside of the movable part 23. The detection area 22 is located on the fixed part 24. The fixed part 24 is a ring structure sleeved on the outside of the movable part 23. The detection area 22 is an annular area surrounding the movable part 23. The output end of the motor 60 is connected to the movable part 23. The motor 60 drives the movable part 23 to rotate. The movable part 23 is used to position the product 50 and drive the product 50 to rotate. During detection, the product 50 is sleeved on the movable part 23 and rotates with the movable part 23.

[0031] In this embodiment, the product 50 is rotated relative to the detection unit 30 by a motor 60 instead of manually.

[0032] Example 3, as Figure 5 As shown, the difference between this embodiment and Embodiment 2 is that the fixed part 24 is located in the middle of the positioning seat 20, the movable part 23 is located on the outside of the fixed part 24, the outer side of the fixed part 24 is provided with a bearing 70, the movable part 23 is rotatably connected to the fixed part 24 through the bearing 70, the detection area 22 is located on the movable part 23, the movable part 23 is a ring structure sleeved on the outside of the fixed part 24, the detection area 22 is an annular area surrounding the fixed part 24, the fixed part 24 is used to position the product, during detection, the product 50 is sleeved on the fixed part 24, the movable part 23 drives the detection unit 30 to perform a circular motion to detect the product 50.

[0033] In this embodiment, the outer side of the rotating part is a gear 80 structure (not shown), and the motor 60 drives the rotating part to rotate through the gear 80.

[0034] To avoid interference with the inspection unit, the bearing 70 is located at the lower end of the fixing part 24.

[0035] Example 4, as Figure 6 As shown, the difference between this embodiment and the first embodiment is that the spring 51 in this embodiment is close to the outside of the product 50, the detection unit 30 is arranged horizontally, and the detection end of the detection unit 30 faces the positioning part 21 and is close to the outside of the product 50.

[0036] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A device for detecting the inner casing of an oil seal spring, comprising a working platform, characterized in that, The work platform is equipped with a positioning seat, on which the product is placed. The positioning seat is equipped with a detection area and an indicator unit. The detection area is equipped with at least one detection unit. The detection unit moves relative to the product. The detection unit detects whether the spring inside the product is broken through electromagnetic induction. The detection unit is electrically connected to the indicator unit, which is used to express the detection result of the detection unit.

2. The oil seal spring inner casing detection device according to claim 1, characterized in that, The positioning seat has a positioning part in the middle, and the detection area is located on the outside of the positioning part. The product is rotated for detection.

3. The oil seal spring inner casing detection device according to claim 2, characterized in that, The detection area is a ring-shaped area surrounding the positioning part.

4. The oil seal spring inner casing detection device according to claim 1, characterized in that, It also includes a motor, and the positioning seat includes a movable part and a fixed part, and the motor is used to drive the movable part to rotate.

5. The oil seal spring inner casing detection device according to claim 4, characterized in that, The movable part is located in the middle of the positioning seat, the fixed part is located on the outside of the movable part, and the detection area is located on the fixed part. The movable part is used to position the product and drive the product to rotate. During detection, the product is fitted on the movable part and rotates with the movable part.

6. The oil seal spring inner casing detection device according to claim 5, characterized in that, The fixed part is a ring-shaped structure sleeved on the outside of the movable part, and the detection area is a ring-shaped area surrounding the movable part.

7. The oil seal spring inner casing detection device according to claim 4, characterized in that, The fixed part is located in the middle of the positioning seat, and the movable part is located on the outside of the fixed part. The fixed part is provided with a bearing on the outside of the fixed part. The movable part is rotatably connected to the fixed part through the bearing. The detection area is located on the movable part. The fixed part is used to position the product. During detection, the product is placed on the fixed part, and the movable part drives the detection unit to perform a circular motion to detect the product.

8. The oil seal spring inner casing detection device according to claim 7, characterized in that, The movable part is a ring-shaped structure fitted around the outside of the fixed part, and the detection area is a ring-shaped area surrounding the fixed part.

9. The oil seal spring inner casing detection device according to claim 3, 6, or 8, characterized in that, The number of detection units is four, and the four detection units are distributed in a ring array along the detection area.

10. The oil seal spring inner casing detection device according to claim 9, characterized in that, The number of the indicator unit is one, and the four detection units are connected in series with one indicator unit.

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