Membrane thickness detection device and method thereof

Abstract

The invention relates to the technical field of thickness detection, in particular to a membrane thickness detection device and method. The invention provides a membrane thickness detection device which comprises a support, two mounting rods arranged at intervals are connected to the middle of the support, an upper thickness gauge is mounted at the bottom of the mounting rod on the upper side, a lower thickness gauge is mounted at the top of the mounting rod on the lower side, a two-dimensional motion platform is arranged on the upper portion of the support, and a moving plate is arranged on the two-dimensional motion platform. A conveying belt conveys a diaphragm, the position of the diaphragm is limited through a positioning rod and a pushing part, the bottom end of a rotating cylinder and an air bag penetrate through a center hole of the diaphragm, the air bag expands to limit the diaphragm, the left half part of the diaphragm is located between an upper thickness measurer and a lower thickness measurer, and the rotating cylinder, the air bag and the diaphragm rotate; the upper thickness measuring device and the lower thickness measuring device are used for detecting the distance between the upper thickness measuring device and the diaphragm respectively, the diaphragm cannot be distorted or deformed, detection is automatic, conveying and detection of the diaphragm are continuously carried out, and the detection efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of thickness detection, and in particular to a diaphragm thickness detection device and method. Background Art

[0002] The diaphragm is an elastic sensitive element. Some diaphragms are round and have a central hole. When the two sides of the diaphragm are subjected to different pressures, the diaphragm moves toward the side with lower pressure, causing its center to move in a certain relationship with the pressure difference. The thickness of the diaphragm directly affects its physical properties. In order to ensure that the diaphragm thickness meets the requirements, the thickness of the diaphragm needs to be tested.

[0003] Since the diaphragm is soft and has concave parts on the surface, the dual light source detection method is usually used to detect the thickness of the diaphragm, but there are the following problems: (1) The diaphragm is easily distorted by external force during the detection process, causing the measured thickness of the diaphragm to change, affecting the detection of the diaphragm thickness; (2) The samples need to be placed on the test bench manually and removed after the test is completed. However, when the number of samples to be tested is large, it is difficult to transport and test the membrane continuously, which affects the test efficiency.

[0004] Therefore, there is an urgent need to develop an automated and highly efficient diaphragm thickness detection device and method. Summary of the invention

[0005] In view of this, the present invention provides a diaphragm thickness detection device and method.

[0006] A diaphragm thickness detection device comprises a bracket, two spaced-apart mounting rods are connected in the middle of the bracket, an upper thickness gauge is installed at the bottom of the upper mounting rod, a lower thickness gauge is installed at the top of the lower mounting rod, a two-dimensional motion platform is provided on the upper part of the bracket, a moving plate is provided on the two-dimensional motion platform, a rotating drum driven by a driving mechanism is rotatably connected to the front end of the moving plate, the rotating drum is hollow and an airbag is connected at the bottom end, and after the bottom end of the rotating drum and the airbag pass through the central hole of the diaphragm, the airbag expands to limit the position of the diaphragm.

[0007] In addition, it is particularly preferred that the two-dimensional motion platform includes an electric slide rail, the electric slide rail is installed on the bracket, the translation plate is installed on the electric slide rail, the translation plate is connected to an electric push rod 1, the moving plate is slidably connected to the translation plate, and the telescopic rod of the electric push rod 1 is connected to the moving plate.

[0008] In addition, it is particularly preferred that the driving mechanism includes a reduction motor, the movable plate is connected to the reduction motor, and the output shaft of the reduction motor is transmitted to the rotating drum through a synchronous wheel assembly.

[0009] In addition, it is particularly preferred that the diaphragm thickness detection device also includes a limit cylinder, a limit cylinder that slides up and down is provided at the bottom of the rotating cylinder, the diameter of the limit cylinder is larger than the diameter of the center hole of the diaphragm, and a bolt is threadedly connected to the limit cylinder, and the bolt is in contact with the rotating cylinder.

[0010] In addition, it is particularly preferred that the diaphragm thickness detection device also includes a conveying mechanism, the conveying mechanism includes a connecting frame, the connecting frame is connected to the bracket, two side plates are connected to the top of the connecting frame, two synchronous rollers and two guide cylinders are installed between the two side plates, a servo motor is connected to the side plate, the output shaft of the servo motor is connected to one of the synchronous rollers, two conveyor belts are wound around the two synchronous rollers and the two guide cylinders, and limit rods are connected to the top of the side plates, and a positioning rod is connected between the two limit rods.

[0011] In addition, it is particularly preferred that the diaphragm thickness detection device also includes a pushing mechanism, the pushing mechanism includes a sliding frame, the sliding frame is slidably connected between two limit rods, the sliding frame is provided with a convex portion that cooperates with the limit rod, the sliding frame has a pushing portion for pushing the diaphragm, the sliding frame is connected to a connecting rod, the connecting frame is connected to an electric push rod 2, and the telescopic rod of the electric push rod 2 is connected to the connecting rod.

[0012] In addition, it is particularly preferred that the diaphragm thickness detection device also includes a fixed ring, which is connected to the rotating drum, and a lifting ring located below the fixed ring is slidably connected to the rotating drum, a spring is connected between the lifting ring and the fixed ring, a plurality of push rods are connected to the bottom of the lifting ring at circumferential intervals, and a triangular plate with an inclined surface is connected to the bracket, and the lifting ring will contact the inclined surface of the triangular plate when it moves.

[0013] A method for detecting the thickness of a diaphragm comprises the following steps: S1: Place the diaphragm on the conveyor belt, two limit rods limit the diaphragm in the front and rear directions, the conveyor belt conveys the diaphragm, the left side of the diaphragm contacts the positioning rod, the sliding frame moves to the left, the pushing part contacts the right side of the diaphragm, and the position of the diaphragm is limited in the left and right directions by the positioning rod and the pushing part; S2: The drum and the airbag are moved in the left-right and up-down directions by a two-dimensional motion platform, the bottom end of the drum and the airbag pass through the central hole of the diaphragm, and the airbag expands to limit the diaphragm; S3: The rotating drum, the airbag and the diaphragm are moved by a two-dimensional motion platform. The left half of the diaphragm is located between the upper thickness gauge and the lower thickness gauge. The upper thickness gauge detects the distance between the upper thickness gauge and the top surface of the diaphragm, and the lower thickness gauge detects the distance between the upper thickness gauge and the bottom surface of the diaphragm. The rotating drum, the airbag and the diaphragm rotate together, thereby detecting the thickness of the diaphragm. S4: The airbag retracts and recovers, the drum and the airbag leave the center hole of the diaphragm, the diaphragm is placed on the conveyor belt, and the conveyor belt transports the diaphragm.

[0014] The beneficial effects of the present invention are as follows: 1. The conveyor belt conveys the diaphragm, and the position of the diaphragm is limited by the positioning rod and the pushing part. The bottom end of the rotating drum and the airbag pass through the central hole of the diaphragm, and the airbag expands to limit the diaphragm. The left half of the diaphragm is located between the upper thickness gauge and the lower thickness gauge. The rotating drum, the airbag and the diaphragm rotate, and the distance between them and the diaphragm is respectively detected by the upper thickness gauge and the lower thickness gauge. The diaphragm will not be distorted and deformed, and the detection is automated. The conveying and detection of the diaphragm are carried out continuously, and the detection efficiency is high.

[0015] 2. After the bottom end of the drum and the airbag pass through the center hole of the diaphragm, the relative position of the diaphragm and the drum is limited by the limiting cylinder to ensure that the diaphragm can smoothly enter between the upper thickness gauge and the lower thickness gauge. By adjusting the relative position of the limiting cylinder and the drum, it can adapt to diaphragms of different thickness ranges.

[0016] 3. The rear half of the lifting ring contacts the inclined surface of the triangular plate, and the triangular plate squeezes the lifting ring downward, driving the push rod to descend relative to the rotating drum. The three push rods push the diaphragm down to ensure that the diaphragm falls smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a front view of the present invention with the side panels on the front side hidden, wherein the limiting rod is cut open.

[0019] Figure 3 It is a schematic structural diagram of the mounting rod, the upper thickness gauge and the lower thickness gauge of the present invention.

[0020] Figure 4 The present invention is a schematic structural diagram of a two-dimensional motion platform, a moving plate, a rotating drum, a reduction motor, a synchronous wheel assembly, an airbag, a lifting ring and a push rod.

[0021] Figure 5 It is a schematic structural diagram of the rotating drum, airbag, limiting cylinder, bolts, fixing ring, lifting ring and push rod of the present invention.

[0022] Figure 6 It is a schematic structural diagram of the rotating drum, airbag, limiting cylinder and bolt of the present invention.

[0023] Figure 7 It is a schematic diagram of the structure of the conveying mechanism and the pushing mechanism of the present invention.

[0024] Figure 8 For the present invention Figure 7 Top view after the middle connecting frame is hidden.

[0025] The reference numbers in the figure are as follows: 1- bracket, 2- mounting rod, 3- upper thickness gauge, 4- lower thickness gauge, 40- diaphragm, 5- two-dimensional motion platform, 51- electric slide rail, 52- translation plate, 53- electric push rod 1, 6- moving plate, 7- rotating drum, 71- reduction motor, 72- synchronous wheel assembly, 8- air bag, 9- limiting cylinder, 91- bolt, 101- connecting frame, 102- side plate, 103- synchronous roller, 104- conveyor belt, 105- limiting rod, 106- positioning rod, 107- guide cylinder, 111- sliding frame, 112- convex strip part, 113- pushing part, 114- connecting rod, 115- electric push rod 2, 121- fixing ring, 122- lifting ring, 123- push rod, 124- triangle plate. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0027] Embodiment 1: A membrane thickness detection device, referring to Figure 1-Figure 8 , including a bracket 1, a mounting rod 2, an upper thickness gauge 3, a lower thickness gauge 4, a two-dimensional motion platform 5, a moving plate 6, a rotating drum 7, a driving mechanism and an airbag 8. Two mounting rods 2 are connected to the middle of the bracket 1 and are arranged at intervals. The two mounting rods 2 are aligned up and down. The upper thickness gauge 3 is installed at the bottom of the upper mounting rod 2, and the lower thickness gauge 4 is installed at the top of the lower mounting rod 2. The structures and detection principles of the upper thickness gauge 3 and the lower thickness gauge 4 are the existing technology. A two-dimensional motion platform 5 is provided on the upper part of the bracket 1, and a moving plate 6 is provided on the two-dimensional motion platform 5. The two-dimensional motion platform 5 includes an electric slide rail 51, a translation plate 52 and an electric push rod 53. The upper part of the bracket 1 is installed with an electric slide rail 51, and a translation plate 52 is installed on the electric slide rail 51. The translation plate An electric push rod 53 is bolted to the top of 52, and a movable plate 6 is slidably connected to the translation plate 52, and a telescopic rod of the electric push rod 53 is connected to the movable plate 6; the front end of the movable plate 6 is rotatably connected to a rotating drum 7 driven by a driving mechanism, and the driving mechanism includes a reduction motor 71 and a synchronous wheel assembly 72. A reduction motor 71 is bolted to the front of the movable plate 6, and the output shaft of the reduction motor 71 is transmitted to the rotating drum 7 through the synchronous wheel assembly 72; the rotating drum 7 is hollow and a spherical airbag 8 is connected to the bottom end. After the bottom end of the rotating drum 7 and the airbag 8 pass through the center hole of the diaphragm 40, the airbag 8 expands to limit the position of the diaphragm 40 to prevent the diaphragm 40 from falling off the rotating drum 7 during the detection process. At the same time, the diaphragm 40 will not be twisted and deformed, thereby ensuring the accuracy of thickness detection.

[0028] refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 The diaphragm thickness detection device also includes a limit cylinder 9 and a bolt 91. A limit cylinder 9 that slides up and down is provided at the bottom of the rotating cylinder 7. The diameter of the limit cylinder 9 is larger than the diameter of the center hole of the diaphragm 40, so that the limit cylinder 9 will not pass through the center hole of the diaphragm 40. The upper part of the limit cylinder 9 is threadedly connected with a bolt 91, and the end of the bolt 91 is in close contact with the outer wall of the rotating cylinder 7.

[0029] refer to Figure 1 , Figure 2 , Figure 7 and Figure 8 The film thickness detection device also includes a conveying mechanism, which includes a connecting frame 101, a side plate 102, a synchronous roller 103, a conveyor belt 104, a limit rod 105, a positioning rod 106 and a guide cylinder 107. The lower part of the bracket 1 is welded with a connecting frame 101, and two symmetrical side plates 102 are fixedly connected to the top of the connecting frame 101. Two synchronous rollers 103 and two guide cylinders 107 are installed between the two side plates 102. The front side plate 102 is bolted with A servo motor, the output shaft of the servo motor is connected to the synchronous roller 103 on the right side, two conveyor belts 104 are wound between the two synchronous rollers 103 and the two guide cylinders 107, and the two conveyor belts 104 are arranged at intervals so that when the rotating drum 7 and the airbag 8 pass through the central hole of the diaphragm 40, the rotating drum 7 and the airbag 8 will not be blocked by the conveyor belt 104, and the top of the side plate 102 is fixedly connected to a limit rod 105, and a positioning rod 106 is fixedly connected between the middle parts of the two limit rods 105.

[0030] refer to Figure 1 , Figure 2 , Figure 7 and Figure 8 The diaphragm thickness detection device also includes a pushing mechanism, which includes a sliding frame 111, a connecting rod 114 and an electric push rod 115. The sliding frame 111 is slidably connected between the right ends of the two limit rods 105. The sliding frame 111 is provided with a convex portion 112 that cooperates with the limit rod 105. The middle part of the sliding frame 111 has a pushing portion 113 for pushing the diaphragm 40. The sliding frame 111 is welded with a connecting rod 114. The electric push rod 115 is bolted to the connecting frame 101, and the telescopic rod of the electric push rod 115 is connected to the connecting rod 114.

[0031] In this embodiment, the discharge end of the conveying device (such as a belt conveyor) of the previous process of the diaphragm 40 is set above the right end of the conveyor belt 104, so that the diaphragm 40 of the previous process falls on the right ends of the two conveyor belts 104, and the two limit rods 105 limit the diaphragm 40 in the front and rear directions. The servo motor is controlled to drive the synchronous roller 103 on the right to rotate counterclockwise, and the synchronous roller 103 on the left is driven to rotate counterclockwise under the transmission action of the conveyor belt 104. The two guide cylinders 107 play a guiding role, so that the left and right ends of the conveyor belt 104 have a slope, which is convenient for transporting the diaphragm 40; the conveyor belt 104 transports the diaphragm 40 to the left until the left side of the diaphragm 40 contacts the positioning rod 106.

[0032] The control electric push rod 115 drives the connecting rod 114 to move leftward, driving the sliding frame 111 to move leftward along the direction of the convex portion 112 until the pushing portion 113 of the sliding frame 111 contacts the right side of the diaphragm 40, and limits the position of the diaphragm 40 in the left and right directions through the positioning rod 106 and the pushing portion 113 to avoid position deviation of the diaphragm 40.

[0033] The electric slide rail 51 is controlled to drive the translation plate 52 to move in the left and right directions, driving the movable plate 6, the rotating drum 7 and the airbag 8 to move in the left and right directions, so that the airbag 8 moves to the bottom of the center hole of the diaphragm 40. The electric push rod 53 is controlled to drive the translation plate 52 to move downward, driving the rotating drum 7 and the airbag 8 to move downward. The bottom end of the rotating drum 7 and the airbag 8 pass through the center hole of the diaphragm 40 and are connected to the top end of the rotating drum 7 through an external inflation device. The inflation device inflates the airbag 8, and the airbag 8 expands so that the diameter of the airbag 8 is larger than the diameter of the center hole of the diaphragm 40, thereby limiting the diaphragm 40 through the inflated airbag 8.

[0034] Then, the electric slide rail 51 is controlled to move the translation plate 52, the moving plate 6, the rotating drum 7, the airbag 8 and the diaphragm 40 to the left until the left half of the diaphragm 40 is located between the upper thickness gauge 3 and the lower thickness gauge 4. The upper thickness gauge 3 detects the distance between the upper thickness gauge 3 and the top surface of the diaphragm 40, and the lower thickness gauge 4 detects the distance between the lower thickness gauge 4 and the bottom surface of the diaphragm 40, so that the thickness of the diaphragm 40 at this position can be measured. Under the transmission action of the synchronous wheel assembly 72, the reduction motor 71 is controlled to rotate the rotating drum 7, driving the airbag 8 and the diaphragm 40 to rotate together, so that the other positions of the diaphragm 40 are located at the upper thickness gauge. The thickness of the diaphragm 40 is detected between the upper and lower thickness gauges 3 and the lower thickness gauge 4; finally, the two-dimensional motion platform 5 is used to move the rotating drum 7, the airbag 8 and the diaphragm 40 to the right, up and down in sequence, and the inflation device is controlled to shrink the airbag 8, and the rotating drum 7 and the airbag 8 rise to leave the center hole of the diaphragm 40, and the diaphragm 40 is placed on the conveyor belt 104, and the conveyor belt 104 conveys the detected diaphragm 40 to the left. In this way, the thickness of the diaphragm 40 can be automatically detected, the diaphragm 40 will not be twisted or deformed, the detection is automated, and the transportation and detection of the diaphragm 40 are carried out continuously, with high detection efficiency.

[0035] When the bottom end of the rotating cylinder 7 and the airbag 8 pass through the center hole of the diaphragm 40, the diameter of the limiting cylinder 9 is larger than the diameter of the center hole of the diaphragm 40, and the bottom surface of the limiting cylinder 9 contacts the top surface of the diaphragm 40, thereby limiting the relative position of the diaphragm 40 and the rotating cylinder 7 through the limiting cylinder 9, avoiding the diaphragm 40 from being too high relative to the rotating cylinder 7, and ensuring that the diaphragm 40 can smoothly enter between the upper thickness gauge 3 and the lower thickness gauge 4. When it is necessary to detect diaphragms 40 with different thickness ranges, the bolt 91 is manually rotated to separate the bolt 91 from the outer wall of the rotating cylinder 7, so as to push the limiting cylinder 9 to slide up and down to adjust the relative position of the limiting cylinder 9 and the rotating cylinder 7, and then tighten the bolt 91 to fix the position of the limiting cylinder 9, so as to adapt to diaphragms 40 with different thickness ranges.

[0036] Example 2: Based on Example 1, refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 The diaphragm thickness detection device also includes a fixed ring 121, a lifting ring 122, a push rod 123 and a triangular plate 124. The fixed ring 121 is fixedly connected to the middle of the rotating drum 7, and the lifting ring 122 located below the fixed ring 121 is slidably connected to the middle of the rotating drum 7. A spring is fixedly connected between the lifting ring 122 and the fixed ring 121. Three push rods 123 are connected to the bottom of the lifting ring 122 at circumferential intervals. A triangular plate 124 with an inclined surface is connected to the left side of the middle of the bracket 1. The lifting ring 122 moves to the left and contacts with the inclined surface of the triangular plate 124, thereby squeezing the lifting ring 122 down. After the lifting ring 122 is separated from the triangular plate 124, the lifting ring 122 rises and resets through the spring.

[0037] When the detection of the diaphragm 40 is completed, the rotating drum 7, the airbag 8 and the diaphragm 40 are moved right, up and down in sequence through the two-dimensional motion platform 5, and the fixed ring 121, the lifting ring 122 and the push rod 123 move together with the rotating drum 7, and the lifting ring 122 moves to the right of the triangular plate 124. After the airbag 8 retracts and recovers, the two-dimensional motion platform 5 is controlled to move the rotating drum 7, the fixed ring 121, the lifting ring 122, the push rod 123, the airbag 8 and the diaphragm 40 to the left, and the rear half of the lifting ring 122 contacts the inclined surface of the triangular plate 124. The triangular plate 124 squeezes the lifting ring 122 to descend, driving the push rod 123 to descend relative to the rotating drum 7, the spring is stretched, and the three push rods 123 push the diaphragm 40 down, avoiding the problem that the diaphragm 40 cannot fall due to friction, thereby ensuring that the diaphragm 40 falls smoothly.

[0038] A method for detecting the thickness of a diaphragm comprises the following steps: S1: The diaphragm 40 is placed on the conveyor belt 104, and the two limiting rods 105 limit the diaphragm 40 in the front-rear direction. The conveyor belt 104 conveys the diaphragm 40, and the left side of the diaphragm 40 contacts the positioning rod 106. The sliding frame 111 moves to the left, and the pushing part 113 contacts the right side of the diaphragm 40. The position of the diaphragm 40 is limited in the left-right direction by the positioning rod 106 and the pushing part 113; S2: The drum 7 and the airbag 8 are moved in the left-right direction and the up-down direction by the two-dimensional motion platform 5, and the bottom end of the drum 7 and the airbag 8 pass through the central hole of the diaphragm 40, and the airbag 8 expands to limit the diaphragm 40; S3: The drum 7, the airbag 8 and the diaphragm 40 are moved by the two-dimensional motion platform 5. The left half of the diaphragm 40 is located between the upper thickness gauge 3 and the lower thickness gauge 4. The upper thickness gauge 3 detects the distance between the upper thickness gauge 3 and the top surface of the diaphragm 40, and the lower thickness gauge 4 detects the distance between the upper thickness gauge 3 and the bottom surface of the diaphragm 40. The drum 7, the airbag 8 and the diaphragm 40 rotate together, thereby detecting the thickness of the diaphragm 40. S4: the airbag 8 retracts and recovers, the drum 7 and the airbag 8 leave the central hole of the diaphragm 40, and the diaphragm 40 is placed on the conveyor belt 104, which conveys the tested diaphragm 40.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A diaphragm thickness detection device, comprising a bracket (1), characterized in that: The middle of the bracket (1) is connected to two installation rods (2) arranged at intervals, an upper thickness gauge (3) is installed at the bottom of the upper installation rod (2), and a lower thickness gauge (4) is installed at the top of the lower installation rod (2). A two-dimensional motion platform (5) is provided on the upper part of the bracket (1), and a moving plate (6) is provided on the two-dimensional motion platform (5). The front end of the moving plate (6) is rotatably connected to a rotating drum (7) driven by a driving mechanism. The rotating drum (7) is hollow and the bottom end is connected to an airbag (8). After the bottom end of the rotating drum (7) and the airbag (8) pass through the central hole of the diaphragm (40), the airbag (8) expands to limit the position of the diaphragm (40).

2. A diaphragm thickness detection device according to claim 1, characterized in that: The two-dimensional motion platform (5) comprises an electric slide rail (51), the bracket (1) is provided with the electric slide rail (51), a translation plate (52) is provided on the electric slide rail (51), the translation plate (52) is connected with an electric push rod 1 (53), the moving plate (6) is slidably connected to the translation plate (52), and the telescopic rod of the electric push rod 1 (53) is connected to the moving plate (6).

3. A diaphragm thickness detection device according to claim 2, characterized in that: The driving mechanism comprises a reduction motor (71), the moving plate (6) is connected to the reduction motor (71), and the output shaft of the reduction motor (71) is driven by the rotating drum (7) via a synchronous wheel assembly (72).

4. A diaphragm thickness detection device according to claim 3, characterized in that: The diaphragm thickness detection device also includes a limit cylinder (9), the bottom end of the rotating cylinder (7) is provided with a limit cylinder (9) that slides up and down, the diameter of the limit cylinder (9) is larger than the diameter of the center hole of the diaphragm (40), and a bolt (91) is threadedly connected to the limit cylinder (9), and the bolt (91) is in contact with the rotating cylinder (7).

5. A diaphragm thickness detection device according to claim 4, characterized in that: The diaphragm thickness detection device also includes a conveying mechanism, the conveying mechanism including a connecting frame (101), the bracket (1) is connected to the connecting frame (101), the top of the connecting frame (101) is connected to two side plates (102), two synchronous rollers (103) and two guide cylinders (107) are installed between the two side plates (102), a servo motor is connected to the side plate (102), the output shaft of the servo motor is connected to one of the synchronous rollers (103), two conveyor belts (104) arranged at intervals are wound between the two synchronous rollers (103) and the two guide cylinders (107), the tops of the side plates (102) are connected to limit rods (105), and a positioning rod (106) is connected between the two limit rods (105).

6. A diaphragm thickness detection device according to claim 5, characterized in that: The diaphragm thickness detection device also includes a pushing mechanism, the pushing mechanism including a sliding frame (111), the sliding frame (111) is slidably connected between two limit rods (105), the sliding frame (111) is provided with a convex portion (112) cooperating with the limit rod (105), the sliding frame (111) has a pushing portion (113) for pushing the diaphragm (40), the sliding frame (111) is connected to a connecting rod (114), the connecting frame (101) is connected to a second electric push rod (115), and the telescopic rod of the second electric push rod (115) is connected to the connecting rod (114).

7. A diaphragm thickness detection device according to claim 6, characterized in that: The diaphragm thickness detection device also includes a fixed ring (121), the fixed ring (121) is connected to the rotating cylinder (7), a lifting ring (122) located below the fixed ring (121) is slidably connected to the rotating cylinder (7), a spring is connected between the lifting ring (122) and the fixed ring (121), a plurality of push rods (123) are connected to the bottom of the lifting ring (122) at circumferential intervals, and a triangular plate (124) with an inclined surface is connected to the bracket (1), and the lifting ring (122) contacts the inclined surface of the triangular plate (124) when it moves.

8. A diaphragm thickness detection method, based on the diaphragm thickness detection device according to claim 6, characterized in that: The following steps are involved: S1: placing a diaphragm (40) on a conveyor belt (104), two limiting rods (105) limiting the position of the diaphragm (40) in the front-rear direction, the conveyor belt (104) conveying the diaphragm (40), the left side of the diaphragm (40) contacting the positioning rod (106), the sliding frame (111) moving to the left, the pushing part (113) contacting the right side of the diaphragm (40), and limiting the position of the diaphragm (40) in the left-right direction by the positioning rod (106) and the pushing part (113); S2: The rotating drum (7) and the airbag (8) are moved in the left-right direction and the up-down direction by means of the two-dimensional motion platform (5); the bottom end of the rotating drum (7) and the airbag (8) pass through the central hole of the diaphragm (40); and the airbag (8) is expanded to limit the position of the diaphragm (40); S3: The rotating drum (7), the airbag (8) and the diaphragm (40) are moved by means of a two-dimensional motion platform (5). The left half of the diaphragm (40) is located between the upper thickness gauge (3) and the lower thickness gauge (4). The distance between the upper thickness gauge (3) and the top surface of the diaphragm (40) is detected, while the distance between the lower thickness gauge (4) and the bottom surface of the diaphragm (40) is detected. The rotating drum (7), the airbag (8) and the diaphragm (40) rotate together, thereby detecting the thickness of the diaphragm (40). S4: the airbag (8) retracts and recovers, the rotating drum (7) and the airbag (8) leave the central hole of the diaphragm (40), the diaphragm (40) is placed on the conveyor belt (104), and the conveyor belt (104) conveys the diaphragm (40).

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