A device for detecting the flatness of a rubber diaphragm after shaping

Abstract

The present invention relates to the field of rubber diaphragm detection technology, and specifically discloses a device for detecting the flatness of a rubber diaphragm after it has been shaped, comprising: a platform base, air holes, a rubber diaphragm, a support rod, a floating mechanism, a detection mechanism, a pushing mechanism, and a top plate. The top of the inner cavity of the platform base is provided with a plurality of air holes extending vertically therethrough, and the rubber diaphragm is placed on top of the platform base. This device can simulate the unconstrained working condition of the rubber diaphragm, fully release residual stress, truly reflect the overall stress distribution, and avoid the stress masking problem caused by friction and normal constraints in traditional contact measurement. It is particularly suitable for the precise detection of thin soft or thick hard diaphragms; secondly, it can detect weight balance and identify hidden defects caused by uneven material distribution or different densities, such as stress concentration points and stiffness differences, thereby predicting the deformation, vibration, and fatigue behavior of the diaphragm in actual dynamic applications, significantly reducing the risk of failure during product use and extending its service life.

Description

Technical Field

[0001] The invention relates to the technical field of rubber diaphragm detection, in particular to a device for detecting the flatness of a rubber diaphragm after shaping. Background Art

[0002] As a key elastic component widely used in sealing, shock absorption, sensors and other fields, the quality of rubber diaphragms directly affects the performance and service life of the equipment. During the manufacturing process, rubber diaphragms need to undergo vulcanization, stamping and other molding processes. These processes may lead to problems such as uneven cooling, mold deviation or material shrinkage, which in turn form residual stress inside the diaphragm. At the same time, the instability of the production process may also lead to uneven diaphragm thickness or differences in material density distribution. These inherent defects not only affect the initial flatness of the diaphragm, but also cause deformation due to stress release or external forces during subsequent use, leading to problems such as sealing failure and response inaccuracy. Therefore, during the production process of rubber diaphragms, it is crucial to accurately test their flatness after shaping.

[0003] At present, the conventional method for testing the flatness of rubber diaphragms in the industry mainly adopts contact measurement. The typical device includes a flat platform and a mechanical measuring probe. During the test, the diaphragm is laid flat on the platform surface, and the height difference of each point is measured by pressing down with the probe. Although this method is easy to operate, it has significant limitations: First, the normal constraint of the platform surface on the diaphragm will inhibit the vertical deformation, resulting in insufficient release of internal stress. Only surface phenomena such as local wrinkles or slight edge warping can be detected, but the overall stress distribution of the diaphragm cannot be reflected. Second, the static friction between the rubber and the platform will hinder the smoothness of the diaphragm. The constraint hinders the diaphragm's free horizontal contraction or expansion, causing stress redistribution and potentially masking the actual stress concentration area. This constraint is particularly pronounced for thin and soft diaphragms, where the competition between residual stress and friction may form localized ripples. For thick and hard diaphragms, although the apparent deformation is not obvious, residual stress may lead to long-term creep risks. More importantly, many rubber diaphragms are in a nearly unconstrained state in actual applications (such as pressure-sensitive diaphragms in sensors). Conventional testing methods cannot simulate this operating condition, making it difficult to predict the diaphragm's deformation behavior in actual use.

[0004] Although non-contact detection methods in existing technologies (such as optical scanning) avoid mechanical contact, they still cannot solve the fundamental problem. Such methods usually require the diaphragm to remain stationary and are actually still constrained by the supporting surface. More importantly, existing devices do not consider the impact of material density distribution on diaphragm performance. When the diaphragm has uneven density or composition distribution, even if the thickness and flatness tests are qualified, it may still lead to unbalanced weight distribution: high-density areas have high hardness and are prone to form stress concentration points, accelerating fatigue cracking; low-density areas have insufficient stiffness, resulting in inconsistent deformation in dynamic applications. This unevenness can also cause abnormal vibration and local resonance, reducing product life. In sealing applications, density differences can lead to uneven compression rebound, causing leakage or uneven wear; in a temperature-changing environment, different thermal expansion coefficients are more likely to cause thermal deformation or thermal fatigue. For precision devices, uneven weight distribution can also affect the sensitivity and signal stability of the sensor. Summary of the Invention

[0005] The object of the present invention is to provide a device for detecting the flatness of a rubber diaphragm after shaping, so as to at least solve the problem that the detection method proposed in the prior art has limitations.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a device for detecting the flatness of a rubber diaphragm after it is formed, comprising: a platform base, an air hole, a rubber diaphragm, a support rod, a floating mechanism, a detection mechanism, a pushing mechanism and a top plate, wherein a plurality of air holes running through the top and bottom are opened at the top end of the inner cavity of the platform base, the rubber diaphragm is placed on the top of the platform base, the number of the support rods is four, and the four support rods are respectively arranged at the four corners of the top end of the platform base, and the four corners of the bottom end of the top plate are respectively arranged at the top ends of the four support rods, the floating mechanism is arranged in the inner cavity of the platform base, the floating mechanism can cause the rubber diaphragm to be in a floating state, the detection mechanism can be slidably connected to the outer wall of the support rod, the detection mechanism can detect the flatness of the rubber diaphragm and monitor whether the rubber diaphragm is skewed, the pushing mechanism is arranged at the top end of the top plate, and the pushing mechanism can drive the detection mechanism to move up and down accurately.

[0007] Preferably, the detection mechanism includes: a support plate, a positioning hole, an insulating probe, a baffle and a sensing component, the four corners of the support plate can be slidably adapted to be matched with the middle of the outer wall of the four support rods, the top of the support plate is provided with a plurality of positioning holes passing through the upper and lower parts, the outer wall of the insulating probe can be slidably adapted to be inserted into the inner cavity of the positioning hole, the upper and lower ends of the insulating probe can be slidably extended out of the upper and lower sides of the support plate, the baffle is arranged on the outer wall of the insulating probe, the baffle is located in the inner cavity of the support plate, the baffle is in contact with the bottom end of the inner cavity of the support plate, and the sensing component is arranged on the outer wall of the insulating probe.

[0008] Preferably, the sensing component includes: a first contact, a second contact and an LED indicator light, the first contact is arranged on the inner wall of the positioning hole, the second contact is arranged on the outer wall of the insulating probe, the LED indicator light is arranged on the top of the insulating probe, and the second contact, the pushing mechanism and the LED indicator light are all electrically connected.

[0009] Preferably, the distance between the top end of the baffle and the top end of the inner cavity of the support plate is greater than the distance between the bottom end of the second contact and the top end of the first contact.

[0010] Preferably, the floating mechanism includes: an air pump, an air inlet pipe, a main line, a branch line, an exhaust pipe and an air pressure monitoring assembly, the air pump is screwed to the bottom end of the inner cavity of the platform base, one end of the air inlet pipe is arranged at the air inlet of the air pump, and the other end of the air inlet pipe extends out of the inner cavity of the platform base, the outer wall of the main line is arranged at the front side of the top end of the inner cavity of the platform base, and one end of the main line is arranged at the exhaust port of the air pump, the number of the branch lines is several, and several of the branch lines are equidistantly arranged at the rear side of the outer wall of the main line in the left and right directions, the inner cavity of the branch lines is connected to the inner cavity of the main line, the number of the exhaust pipes is several, and several of the exhaust pipes are equidistantly arranged at the top end of the outer walls of several branch lines in the front and rear directions, the air pressure monitoring assembly is arranged in the inner cavity of the exhaust pipe, and the air pressure monitoring assembly can monitor the air pressure in the inner cavity of the exhaust pipe.

[0011] Preferably, the inner cavity of the exhaust pipe is connected to the inner cavity of the branch pipe, and the top end of the exhaust pipe extends into the inner cavity of the air inlet.

[0012] Preferably, the air pressure monitoring assembly includes: a support frame, a guide rod, a top block, a rubber film and a pressure sensor, the support frame is arranged at the bottom of the inner cavity of the exhaust pipe, the guide rod is arranged at the middle of the top end of the support frame, the top block can be slidably adapted to be matched with the outer wall of the guide rod, the rubber film is arranged on the outer wall of the top block, and the pressure sensor is arranged at the top end of the guide rod.

[0013] Preferably, a solenoid valve is provided at the bottom of the outer wall of the exhaust pipe, and the solenoid valve is electrically connected to its corresponding pressure sensor.

[0014] Preferably, a honeycomb rectifier is provided at the top end of the inner cavity of the exhaust pipe.

[0015] The present invention proposes a device for detecting the flatness of a rubber diaphragm after shaping, which has the following beneficial effects:

[0016] 1. The present invention can blow gas to the top of the bottom end of the platform through the cooperation between the air pump, the air inlet pipe, the main pipeline, the branch pipeline and the exhaust pipe, so that the rubber diaphragm on the platform base can be lifted up under the action of the air pressure and be in an unconstrained floating state, thereby completely releasing the internal stress generated by the rubber diaphragm during the production and processing process.

[0017] 2. In the present invention, when the exhaust pipe blows gas to the top of the platform base, the rubber film will be blown under the action of air pressure to drive the top block to slide upward, so that the top block can be used to squeeze the pressure sensor, prompting the pressure sensor to monitor the air pressure value. At the same time, multiple pressure sensors are used to monitor the pressure of the gas in the inner cavities of multiple exhaust pipes in real time, and the signals are transmitted to the central console through the pressure sensors. The central console is used to compare the air pressures in the inner cavities of multiple exhaust pipes, and the opening and closing degree of the solenoid valve is adjusted according to actual conditions, so that the air pressure in the corresponding exhaust pipe inner cavity can be adjusted, so that the air pressures in several exhaust pipes are the same.

[0018] 3. In the present invention, when the rubber diaphragm has uneven density or composition distribution, it will cause the weight distribution of the rubber diaphragm to be unbalanced. Therefore, when the rubber diaphragm is in a floating state, the gas pressure injected by the multiple exhaust pipes is the same. When the weight distribution of the rubber diaphragm is unbalanced, the floating rubber diaphragm will become skewed. In this case, the support plate is driven downward by the pushing mechanism, and the tilt state of the rubber diaphragm can be detected by the cooperation between the probe, the first contact, the second contact, and the LED indicator.

[0019] 4. When the flatness of the rubber diaphragm needs to be monitored, the air pump is turned off and the rubber diaphragm is spread flat on the platform base. The flatness of the rubber diaphragm can be detected by utilizing the cooperation among the pushing mechanism, the probe, the first contact, the second contact and the LED indicator.

[0020] 5. This device can simulate the unconstrained working condition of the rubber diaphragm, fully release the residual stress, truly reflect the overall stress distribution, and avoid the stress masking problem caused by friction and normal constraints in traditional contact measurement. It is especially suitable for the precise detection of thin soft or thick hard diaphragms; secondly, it can detect weight balance and identify hidden defects caused by uneven material distribution or different densities, such as stress concentration points and stiffness differences, so as to predict the deformation, vibration and fatigue behavior of the diaphragm in actual dynamic applications, greatly reducing the failure risk during product use and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is the front view of the present invention;

[0023] Figure 3 An exploded view of the present invention;

[0024] Figure 4 Exploded diagram of the propulsion mechanism;

[0025] Figure 5 Schematic diagram of the structure of the support plate;

[0026] Figure 6 Schematic diagram of the probe structure;

[0027] Figure 7 is a structural diagram of the floating mechanism;

[0028] Figure 8 This is an exploded view of the floating mechanism;

[0029] Figure 9 for Figure 2 A magnified view of point A;

[0030] Figure 10 for Figure 3 Enlarged view of point B;

[0031] Figure 11 for Figure 5 Enlarged view of point C;

[0032] Figure 12 for Figure 8 Enlarged view of point D.

[0033] In the figure: 1. Platform base; 2. Air hole; 3. Rubber diaphragm; 4. Support rod; 5. Floating mechanism; 51. Air pump; 52. Inlet pipe; 53. Main line; 54. Branch line; 55. Exhaust pipe; 56. Support frame; 57. Guide rod; 58. Top block; 59. Rubber film; 510. Pressure sensor; 511. Solenoid valve; 512. Honeycomb rectifier; 6. Detection mechanism; 61. Support plate; 62. Positioning hole; 63. First contact; 64. Insulation probe; 65. Baffle; 66. Second contact; 67. LED indicator; 7. Pushing mechanism; 71. Transparent acrylic pressure plate; 72. Sleeve; 73. Motor; 74. Screw; 8. Top plate. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figures 1-12The present invention provides a technical solution for a device for detecting the flatness of a rubber diaphragm after it is shaped, comprising: a platform base 1, an air hole 2, a rubber diaphragm 3, a support rod 4, a floating mechanism 5, a detection mechanism 6, a pushing mechanism 7 and a top plate 8. The top end of the inner cavity of the platform base 1 is provided with a plurality of air holes 2 running through it up and down. The rubber diaphragm 3 is placed on the top of the platform base 1. There are four support rods 4, which are respectively arranged at the four corners of the top end of the platform base 1. The four corners of the bottom end of the top plate 8 are respectively arranged at the top ends of the four support rods 4. The floating mechanism 5 is arranged in the inner cavity of the platform base 1. The floating mechanism 5 can cause the rubber diaphragm 3 to be in a floating state. The detection mechanism 6 can be slidably sleeved on the outer wall of the support rod 4. The detection mechanism 6 can detect the flatness of the rubber diaphragm 3 and monitor whether the rubber diaphragm 3 is skewed. The pushing mechanism 7 is arranged at the top end of the top plate 8. The pushing mechanism 7 can drive the detection mechanism 6 to move up and down accurately.

[0036] As a preferred embodiment, further, the detection mechanism 6 includes: a support plate 61, a positioning hole 62, an insulating probe 64, a baffle 65 and a sensing component. The four corners of the support plate 61 can be slidably adapted to be matched with the middle of the outer wall of the four support rods 4. The top of the support plate 61 is provided with a plurality of positioning holes 62 running through the top and bottom. The outer wall of the insulating probe 64 can be slidably adapted to be inserted into the inner cavity of the positioning hole 62. The upper and lower ends of the insulating probe 64 can be slidably extended out of the upper and lower sides of the support plate 61 respectively. The insulating probe 64 contacts the rubber diaphragm 3 to detect the flatness of the rubber diaphragm 3. The baffle 65 is arranged on the outer wall of the insulating probe 64. The baffle 65 is located in the inner cavity of the support plate 61. The baffle 65 contacts the bottom end of the inner cavity of the support plate 61. The baffle 65 is used to shield the insulating probe 64 to prevent the insulating probe 64 from falling. The sensing component is arranged on the outer wall of the insulating probe 64.

[0037] More specifically, the sensing component includes: a first contact 63, a second contact 66 and an LED indicator 67. The first contact 63 is arranged on the inner wall of the positioning hole 62, and the second contact 66 is arranged on the outer wall of the insulating probe 64. The heights of the first contact 63 and the second contact 66 are the same as the height of the allowable error range of the flatness of the rubber diaphragm 3. The distance between the top of the baffle 65 and the top of the inner cavity of the support plate 61 is greater than the distance between the bottom of the second contact 66 and the top of the first contact 63, ensuring that the second contact 66 can move to the top of the first contact 63. The LED indicator 67 is arranged at the top of the insulating probe 64. The second contact 66, the pushing mechanism 7 and the LED indicator 67 are all electrically connected. The LED indicator 67 is a prior art. When the first contact 63 and the second contact 66 are in contact, the LED indicator 67 can be prompted to light up.

[0038] As a preferred embodiment, further, the floating mechanism 5 includes: an air pump 51, an air inlet pipe 52, a main line 53, a branch line 54, an exhaust pipe 55, a solenoid valve 511, a honeycomb rectifier 512 and an air pressure monitoring component. The air pump 51 is screwed to the bottom end of the inner cavity of the platform base 1. The air pump 51 is a prior art and will not be described in detail here. The air pump 51 is used to transport air to the inner cavity of the exhaust pipe 55. One end of the air inlet pipe 52 is provided at the air inlet of the air pump 51, and the other end of the air inlet pipe 52 extends out of the inner cavity of the platform base 1. The outer wall of the main line 53 is provided in the inner cavity of the platform base 1. At the front side of the top, one end of the main pipeline 53 is arranged at the exhaust port of the air pump 51, and the number of branch pipelines 54 is several, and the branch pipelines 54 are respectively arranged at the rear side of the outer wall of the main pipeline 53 at equal distances in the left and right directions, and the inner cavity of the branch pipeline 54 is connected to the inner cavity of the main pipeline 53. There are several exhaust pipes 55, and the exhaust pipes 55 are respectively arranged at the top of the outer wall of the branch pipelines 54 at equal distances in the front and back directions, and the inner cavity of the exhaust pipe 55 is connected to the inner cavity of the branch pipeline 54. The top of the exhaust pipe 55 extends into the inner cavity of the air inlet 2, and the air pressure monitoring component is arranged in the inner cavity of the exhaust pipe 55. The pressure monitoring component can monitor the air pressure in the inner cavity of the exhaust pipe 55. The solenoid valve 511 is arranged at the bottom of the outer wall of the exhaust pipe 55. The solenoid valve 511 is a prior art and will not be described in detail here. The air pressure discharged from the exhaust pipe 55 can be adjusted by adjusting the opening and closing degree of the solenoid valve 511. The honeycomb rectifier 512 is arranged at the top of the inner cavity of the exhaust pipe 55. The honeycomb rectifier 512 is a prior art and will not be described in detail here. The honeycomb rectifier 512 mainly plays four roles here: First, it reduces turbulence and eddy currents. The honeycomb structure divides the airflow into multiple independent small channels, suppresses large-scale eddies, and displays First, it reduces the turbulence intensity and makes the airflow more stable. Second, it evens out the airflow distribution. By constraining and guiding the airflow, the pressure and velocity distribution in each honeycomb unit are ensured to be uniform, and the injection angle is controlled so that the airflow acts perpendicularly on the rubber diaphragm 3. Third, it improves the stability of the system and reduces the vibration and noise caused by turbulence. At the same time, the uniform airflow balances the force on the rubber diaphragm 3 and enhances the floating stability. Fourth, it optimizes the airflow characteristics and improves the uniformity of the dynamic pressure distribution to avoid deformation of the rubber diaphragm 3 caused by local high or low pressure. Overall, the honeycomb rectifier ensures efficient and stable operation of the system by stabilizing, uniformizing and optimizing the airflow.

[0039] More specifically, the air pressure monitoring assembly includes: a support frame 56, a guide rod 57, a top block 58, a rubber film 59 and a pressure sensor 510. The support frame 56 is arranged at the bottom of the inner cavity of the exhaust pipe 55, the guide rod 57 is arranged at the middle of the top of the support frame 56, the top block 58 is slidably adapted to be matched with the outer wall of the guide rod 57, and the rubber film 59 is arranged on the outer wall of the top block 58. When gas is transported in the inner cavity of the exhaust pipe 55, the rubber film 59 will be prompted to drive the top block 58 to move upward under the action of the air pressure and squeeze the pressure sensor. The pressure sensor 510 is arranged at the top of the guide rod 57, and the solenoid valve 511 is electrically connected to the corresponding pressure sensor 510. The pressure sensor 510 is a prior art and will not be described in detail here. The pressure in the inner cavity of the exhaust pipe 55 can be reflected by squeezing the pressure sensor 510 by the top block 58.

[0040] As a preferred solution, further, the pushing mechanism 7 includes: a transparent acrylic pressure plate 71, a sleeve 72, a motor 73 and a screw 74. The four corners of the bottom end of the transparent acrylic pressure plate 71 are respectively arranged at the four corners of the top end of the support plate 61, the sleeve 72 is arranged in the middle of the top end of the transparent acrylic pressure plate 71, and the motor 73 is screwed to the middle of the top end of the top plate 8. The motor 73 is a prior art and will not be described in detail here. The motor 73 is a servo motor. The motor 73 is connected to an encoder. The motor 73 is used here to drive the screw 74 to rotate. The top end of the screw 74 is locked to the output end of the motor 73 through a coupling. The screw 74 is screwed to the inner cavity of the sleeve 72. The rotational force generated by the rotation of the screw 74 can prompt the sleeve 72 to drive the transparent acrylic pressure plate 71 to move up and down.

[0041] The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process. The specific operations are as follows.

[0042] Step 1: When in use, connect the first contact 63 to an external power source, lay the rubber diaphragm 3 flat on the platform base 1, and start the air pump 51. The air pump 51 can inhale gas through the air inlet pipe 52 and discharge it into the inner cavity of the main pipe 53. The gas flows into the inner cavity of the branch pipe 54 along the main pipe 53 and is discharged to the top of the platform base 1 through the exhaust pipe 55. Since the gas flows in the inner cavity of the exhaust pipe 55, it will generate wind pressure, which will blow the rubber film 59 under the action of the wind pressure to drive the top block 58 to move upward, thereby causing the top block 58 to squeeze the pressure sensor 510 upward, and read the pressure sensor 510. The value displayed by the pressure sensor 510 can be used to determine the value of the wind pressure in the inner cavity of the exhaust pipe 55. The pressure sensor 510 transmits the signal to the central console, which uses the central console to compare the values ​​displayed by multiple pressure sensors 510 and adjust the opening and closing degree of the solenoid valve 511 according to the comparison result. By adjusting the opening and closing degree of the solenoid valve 511, the wind pressure in the inner cavity of the exhaust pipe 55 can be adjusted, thereby ensuring that the air pressure of the gas discharged from the multiple exhaust pipes 55 is the same. In turn, under the action of the air pressure, the rubber diaphragm 3 will float up and be in an unconstrained floating state, thereby completely releasing the internal stress of the rubber diaphragm 3 caused by production and processing;

[0043] Step 2: Since the air pressures of the gases discharged from the exhaust pipes 55 are the same, the air pressures at each point of the rubber diaphragm 3 are the same. Therefore, when the density or material distribution of the rubber diaphragm 3 is uneven, the weight distribution of the rubber diaphragm 3 is unbalanced, which causes the floating rubber diaphragm 3 to tilt. At this time, the motor 73 is started, and the motor 73 is used to drive the screw 74 to rotate. The rotational force generated by the rotation of the screw 74 can drive the sleeve 72 to move downward through the transparent acrylic pressure plate 71 to drive the support plate 61, and then the support plate 61 can drive the insulating probe 64 to move downward. When the insulating probe 6 After contacting the rubber diaphragm 3, the support plate 61 continues to drive the insulating probe 64 downward. The rubber diaphragm 3 blocks the insulating probe 64, causing the insulating probe 64 to slide upward along the inner cavity of the positioning hole 62 until one or more second contacts 66 contact the first contacts 63 corresponding to their positions, thereby causing the LED indicator 67 electrically connected to the second contact 66 to light up. At this time, the motor 73 is turned off, and the insulating probe 64 corresponding to the outline of the rubber diaphragm 3 is observed, and the LED indicator 67 at the top of the 64 is observed to see whether it is lit. If there is an unlit LED indicator 67, it indicates that the density of the rubber diaphragm 3 at that position is relatively high.

[0044] Step 3: After the weight distribution of the rubber diaphragm 3 is detected, the air pump 51 is turned off, the rubber diaphragm 3 loses wind pressure, and then falls onto the platform base 1, and the rubber diaphragm 3 is laid flat on the platform base 1 again. According to the standard thickness of the rubber diaphragm 3, the motor 73 is started, and the motor 73 drives the screw 74 to rotate. The rotational force generated by the rotation of the screw 74 can prompt the sleeve 72 to drive the support plate 61 to move downward through the transparent acrylic pressure plate 71, and then the support plate 61 can drive the insulating probe 64 to move downward. After the insulating probe 64 contacts the rubber diaphragm 3, the support plate 61 continues to drive the insulating probe 64 downward. The blocking of the insulating probe 64 by the rubber diaphragm 3 will cause the insulating probe 64 to slide upward along the inner cavity of the positioning hole 62 until the support plate 61 moves to a height at which the first contact 63 and the second contact 66 are completely overlapped under the blocking force of the rubber diaphragm 3 on the insulating probe 64 under the standard thickness of the rubber diaphragm 3. When the motor 73 is turned off, since the heights of the first contact 63 and the second contact 66 are both within the allowable error range of the flatness of the rubber diaphragm 3, the position where the flatness of the rubber diaphragm 3 is qualified will cause the first contact 63 and the second contact 66 to contact, thereby causing the LED indicator 67 at the top of the insulating probe 64 to light up. If there is a position where the rubber diaphragm 3 is too concave and the flatness is unqualified, the second contact 66 at this position will be located below the first contact 63, and the first contact 63 and the second contact 66 will not contact, and the LED indicator 67 at this position will not light up. Similarly, if there is a position where the rubber diaphragm 3 is too convex and the flatness is unqualified, the second contact 66 at this position will be located above the first contact 63, and the first contact 63 and the second contact 66 will not contact, and the LED indicator 67 at this position will not light up. Therefore, whether the flatness of the rubber diaphragm 3 is qualified can be judged by observing the corresponding LED indicator 67 based on the contour of the rubber diaphragm 3.

[0045] Step 4: After the flatness test is completed, disconnect the first contact 63 from the external power supply, and continuously press down the corresponding insulating probe 64 according to the contour of the rubber diaphragm 3. The extrusion force of the insulating probe 64 will cause the rubber diaphragm 3 to elastically deform. When the extrusion force applied by the insulating probe 64 is removed, the rubber diaphragm 3 will return to its initial state due to the elastic action of the rubber diaphragm 3. Repeat this process multiple times. After the extrusion is completed, repeat the above steps to detect whether the rubber diaphragm 3 has permanent deformation, thereby determining the fatigue resistance of the rubber diaphragm 3.

[0046] In summary, this device can simulate the unconstrained working condition of the rubber diaphragm 3, fully release the residual stress, truly reflect the overall stress distribution, and avoid the stress masking problem caused by friction and normal constraints in traditional contact measurement. It is especially suitable for the precise detection of thin soft or thick hard diaphragms; secondly, it can detect weight balance and identify hidden defects caused by uneven material distribution or different densities, such as stress concentration points and stiffness differences, so as to predict the deformation, vibration and fatigue behavior of the diaphragm in actual dynamic applications, greatly reducing the failure risk during product use and extending the service life.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the flatness of a rubber diaphragm after shaping, characterized in that: include: A platform base (1), wherein a plurality of air holes (2) extending vertically through the top of the inner cavity of the platform base (1) are provided; A rubber diaphragm (3) is placed on top of the platform base (1); Support rods (4), the number of the support rods (4) is four, and the four support rods (4) are respectively arranged at the four corners of the top end of the platform base (1); A top plate (8), wherein the four corners of the bottom end of the top plate (8) are respectively arranged on the top ends of the four support rods (4); A floating mechanism (5), the floating mechanism (5) being arranged in the inner cavity of the platform base (1), and the floating mechanism (5) being capable of causing the rubber diaphragm (3) to be in a floating state; A detection mechanism (6), wherein the detection mechanism (6) is slidably sleeved on the outer wall of the support rod (4), and the detection mechanism (6) is capable of detecting the flatness of the rubber diaphragm (3) and monitoring whether the rubber diaphragm (3) is skewed; A pushing mechanism (7), wherein the pushing mechanism (7) is arranged at the top of the top plate (8), and the pushing mechanism (7) can drive the detection mechanism (6) to move up and down accurately; The detection mechanism (6) comprises: A support plate (61), wherein the four corners of the support plate (61) are slidably adapted to be matched with the middle portions of the outer walls of the four support rods (4), and a top end of the support plate (61) is provided with a plurality of positioning holes (62) extending vertically therethrough; An insulating probe (64), wherein the outer wall of the insulating probe (64) is slidably adapted to be inserted into the inner cavity of the positioning hole (62), and the upper and lower ends of the insulating probe (64) are slidably extended out of the upper and lower sides of the support plate (61); a baffle (65), the baffle (65) being arranged on the outer wall of the insulating probe (64), the baffle (65) being located in the inner cavity of the support plate (61), and the baffle (65) being in contact with the bottom end of the inner cavity of the support plate (61); a sensing component, the sensing component being arranged on the outer wall of the insulating probe (64); The sensing component includes: a first contact (63), the first contact (63) being arranged on the inner wall of the positioning hole (62); a second contact (66), the second contact (66) being arranged on an outer wall of the insulating probe (64); An LED indicator light (67) is provided at the top end of the insulating probe (64); the second contact (66), the pushing mechanism (7) and the LED indicator light (67) are all electrically connected.

2. The device for detecting the flatness of a rubber diaphragm after shaping according to claim 1, characterized in that: The distance between the top end of the baffle (65) and the top end of the inner cavity of the support plate (61) is greater than the distance between the bottom end of the second contact point (66) and the top end of the first contact point (63).

3. The device for detecting the flatness of a rubber diaphragm after shaping according to claim 2, characterized in that: The floating mechanism (5) comprises: An air pump (51), the air pump (51) being screw-connected to the bottom end of the inner cavity of the platform base (1); an air intake pipe (52), one end of the air intake pipe (52) being arranged at the air inlet of the air pump (51), and the other end of the air intake pipe (52) extending out of the inner cavity of the platform base (1); A main pipe (53), the outer wall of which is arranged at the front side of the top end of the inner cavity of the platform base (1), and one end of which is arranged at the exhaust port of the air pump (51); Branch pipes (54), the number of the branch pipes (54) is plural, and the branch pipes (54) are equidistantly arranged on the rear side of the outer wall of the main pipe (53) in the left-right direction, and the inner cavities of the branch pipes (54) are connected to the inner cavity of the main pipe (53); Exhaust pipes (55), the number of the exhaust pipes (55) is several, and the several exhaust pipes (55) are respectively arranged at the top ends of the outer walls of the several branch pipes (54) at equal distances along the front-to-back direction; An air pressure monitoring component is provided in the inner cavity of the exhaust pipe (55), and the air pressure monitoring component is capable of monitoring the air pressure in the inner cavity of the exhaust pipe (55).

4. The device for detecting the flatness of a rubber diaphragm after shaping according to claim 3, characterized in that: The inner cavity of the exhaust pipe (55) is connected to the inner cavity of the branch pipe (54), and the top end of the exhaust pipe (55) extends into the inner cavity of the air inlet hole (2).

5. The device for detecting the flatness of a rubber diaphragm after shaping according to claim 4, characterized in that: The air pressure monitoring component includes: A support frame (56), the support frame (56) being arranged at the bottom of the inner cavity of the exhaust pipe (55); A guide rod (57), wherein the guide rod (57) is arranged at the middle of the top end of the support frame (56); A top block (58), wherein the top block (58) is slidably adapted to be coupled to the outer wall of the guide rod (57); A rubber film (59), wherein the rubber film (59) is arranged on the outer wall of the top block (58); A pressure sensor (510) is provided at the top end of the guide rod (57).

6. The device for detecting the flatness of a rubber diaphragm after shaping according to claim 5, characterized in that: A solenoid valve (511) is provided at the bottom of the outer wall of the exhaust pipe (55), and the solenoid valve (511) is electrically connected to its corresponding pressure sensor (510).

7. The device for detecting the flatness of a rubber diaphragm after shaping according to claim 6, characterized in that: A honeycomb rectifier (512) is provided at the top end of the inner cavity of the exhaust pipe (55).

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