A pneumatic clamping device for a breathable turntable

Abstract

The present invention relates to the technical field of fabric performance testing devices, and in particular to a pneumatic clamping device for an air permeability turntable, wherein an air cavity comprises a chamber and an air pipe, the air pipe is connected to the bottom of the chamber, an upper guide sleeve is hollowly sleeved on the inner wall of the lower end of the air pipe, a first cylinder and a second cylinder of an upper pneumatic push unit are respectively relatively fixed on the outer wall of the air pipe, telescopic rods of the first cylinder and the second cylinder are both fixed to an upper push plate, a fixed connecting sleeve of the upper push plate and the upper guide sleeve is arranged directly below the air pipe, a lower guide sleeve is hollowly sleeved on the inner wall of the upper end of the connecting sleeve, a third cylinder and a fourth cylinder of a lower pneumatic push unit are respectively relatively arranged on the outer wall of the connecting sleeve, telescopic rods of the third cylinder and the fourth cylinder are both fixed to a lower push plate, the lower push plate is fixed to a lower guide sleeve, and a turntable is arranged between the upper guide sleeve and the lower guide sleeve. In this scheme, the sealing effect during the test is good, the turntable is more evenly stressed, is not easily damaged, the test data is stable and reliable, and the air permeability conclusion is highly accurate.

Description

Technical Field

[0001] The invention relates to the technical field of fabric performance detection devices, and in particular to a pneumatic clamping device for an air permeability turntable. Background Art

[0002] Fabric is a flat soft piece of material made of small and long pieces that are crossed, entangled or bonded. As the main material of clothing, its various usage indicators are also highly valued by the clothing industry. Breathability, as one of the main parameters of fabric usage indicators, greatly affects the comfort of fabric. Winter clothing needs lower breathability to ensure warmth, while summer clothing needs higher breathability to ensure coolness.

[0003] At present, the air permeability of fabrics is generally tested by air permeability testing devices. When using an air permeability tester to test fabrics, whether the seals on both sides of the nozzle on the turntable are reliable has a great impact on the test results. The existing turntable clamping device mainly relies on the clamp set above the turntable to fix the turntable. However, the clamping force is very large, which can easily cause damage to the turntable, and the clamping seal is not very good, resulting in unstable test data and affecting the accuracy of the fabric permeability test results. In addition, the test nozzle on the existing turntable is prone to clogging, which is complicated to clean and can also easily affect the test structure. Summary of the invention

[0004] To this end, it is necessary to provide a pneumatic clamping device for a permeability turntable to solve the problem that the clamping force of the existing turntable clamping device is very large, which easily causes damage to the turntable, and the clamping sealing is not very good, resulting in unstable test data and affecting the accuracy of the fabric permeability test results.

[0005] To achieve the above-mentioned purpose, the inventor provides a pneumatic clamping device for a breathable turntable, the pneumatic clamping device comprising an air cavity, a connecting sleeve, an upper guide sleeve, a lower guide sleeve, an upper pneumatic pushing unit, a lower pneumatic pushing unit and a turntable, the air cavity comprising a chamber and an air pipe, the air pipe is connected to the bottom of the chamber, the upper guide sleeve is hollowly sleeved on the inner wall of the lower end of the air pipe, the upper guide sleeve can slide along the inner wall of the air pipe, the upper pneumatic pushing unit comprises a first cylinder, a second cylinder and an upper pushing plate, the first cylinder and the second cylinder are respectively relatively fixed on the outer wall of the air pipe, and the telescopic rods of the first cylinder and the second cylinder are The lower guide sleeve is slidable along the inner wall of the connecting sleeve, and the lower pneumatic pushing unit comprises a third cylinder, a fourth cylinder and a lower push plate, and the third cylinder and the fourth cylinder are respectively arranged on the outer wall of the connecting sleeve relatively, and the telescopic rods of the third cylinder and the fourth cylinder are both fixed to the lower push plate, and the lower push plate is fixed to the lower guide sleeve, and the turntable is arranged between the upper guide sleeve and the lower guide sleeve, and nozzles are arranged at the corresponding positions of the center holes of the turntable, the upper guide sleeve and the lower guide sleeve.

[0006] As a preferred structure of the present invention, the pneumatic clamping device also includes a first sealing ring and a second sealing ring. An annular groove is provided on the outer wall of the upper guide sleeve. The first sealing ring is arranged in the annular groove and contacts the inner wall of the trachea. The second sealing ring is arranged on the bottom surface of the upper guide sleeve.

[0007] As a preferred structure of the present invention, the pneumatic clamping device also includes a third sealing ring and a fourth sealing ring. An annular groove is provided on the outer wall of the lower guide sleeve. The third sealing ring is arranged in the annular groove and contacts the inner wall of the connecting sleeve. The fourth sealing ring is arranged on the contact surface between the nozzle and the turntable.

[0008] As a preferred structure of the present invention, the pneumatic clamping device further comprises a clamping block, which is clamped and fixed on the outer wall of the air pipe, and the first cylinder and the second cylinder are both arranged on the clamping block.

[0009] As a preferred structure of the present invention, the upper pneumatic pushing unit further includes a fixing block, and the fixing block is disposed between the telescopic rod of the first cylinder, the telescopic rod of the second cylinder and the upper pushing plate.

[0010] As a preferred structure of the present invention, the pneumatic clamping device further comprises a transmission plate, the transmission plate is fixed on the outer wall of the connecting sleeve, and the third cylinder and the fourth cylinder are both arranged on the transmission plate.

[0011] As a preferred structure of the present invention, the pneumatic clamping device also includes a rotation drive mechanism, which includes a motor and a rotating shaft. The motor is fixed on a transmission plate, the motor is transmission-connected to the rotating shaft, and the rotating shaft passes through the transmission plate and is fixed to the turntable.

[0012] As a preferred structure of the present invention, the rotary drive mechanism further includes a bearing seat and a connecting flange, the bearing seat is sleeved outside the rotating shaft and fixed to the transmission plate, and the connecting flange connects the rotating shaft and the transmission plate.

[0013] As a preferred structure of the present invention, the pneumatic clamping device also includes a cleaning mechanism, which includes a bent plate, a mounting block and an air nozzle. The bent plate is fixed to the transmission plate, and the air nozzle is fixed to the bent plate through the mounting block. The nozzle of the air nozzle is set downward, and the air nozzle is connected to an external air source through an air supply pipe.

[0014] As a preferred structure of the present invention, at least two nozzles are evenly distributed on the turntable, and when the turntable rotates, the nozzles all pass under the cleaning mechanism air nozzle.

[0015] Different from the prior art, the above technical solution has the following advantages: the present invention is a pneumatic clamping device for a permeability turntable, the first cylinder and the second cylinder in the upper pneumatic pushing unit simultaneously provide driving force to push the upper push plate, and the upper guide sleeve is driven by the upper push plate to move downward along the air pipe of the air cavity until it abuts against the fabric sample placed on the turntable, at the same time, the third cylinder and the fourth cylinder in the lower pneumatic pushing unit provide driving force to push the lower push plate, and the lower guide sleeve is driven by the lower push plate to move up and down along the inner wall of the connecting sleeve until it cooperates with the upper push plate to press the fabric sample placed on the turntable, after pressing, the nozzle on the turntable sprays air, and the gas passes through the air pipe and chamber of the air cavity in turn to perform fabric permeability test. In this solution, under the guidance of the upper guide sleeve and the lower guide sleeve, the running path for pressing the fabric sample is more reliable and the fixing effect is good. In addition, the fabric sample is pressed on the upper and lower surfaces of the turntable respectively through four groups of cylinders. Not only is the sealing effect good during the test, but the turntable is also more evenly stressed and less prone to damage. The test data is stable and reliable, and the air permeability conclusion is highly accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view schematic diagram of a pneumatic clamping device for a breathable turntable according to a specific embodiment;

[0017] Figure 2 for Figure 1 Schematic cross-sectional view along the AA direction;

[0018] Figure 3 It is a top view schematic diagram of a turntable in a pneumatic clamping device for a breathable turntable described in a specific implementation manner.

[0019] Description of reference numerals:

[0020] 1. Air cavity;

[0021] 2. Connecting sleeve;

[0022] 3. Upper guide sleeve;

[0023] 31. First sealing ring;

[0024] 32. Second sealing ring;

[0025] 4. Lower guide sleeve;

[0026] 41. The third sealing ring;

[0027] 42. Fourth sealing ring;

[0028] 51. First cylinder;

[0029] 52. Second cylinder;

[0030] 53. Push up the plate;

[0031] 61, third cylinder;

[0032] 62, fourth cylinder;

[0033] 63. Push down plate;

[0034] 7. Turntable;

[0035] 71. Nozzle;

[0036] 8. Clamp block;

[0037] 9. Fixed block;

[0038] 10. Transmission plate;

[0039] 11. Pads;

[0040] 121. Motor;

[0041] 122. Rotation axis;

[0042] 123. Bearing seat;

[0043] 124. Connecting flange;

[0044] 125. Driving wheel;

[0045] 126, driven wheel;

[0046] 127, transmission wheel;

[0047] 131, bent plate;

[0048] 132, installation block;

[0049] 133. Gas nozzle;

[0050] 134. Air supply pipe. DETAILED DESCRIPTION

[0051] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0052] See also Figures 1 to 3 The present invention provides a pneumatic clamping device for a breathable turntable, the pneumatic clamping device comprises an air cavity 1, a connecting sleeve 2, an upper guide sleeve 3, a lower guide sleeve 4, an upper pneumatic pushing unit, a lower pneumatic pushing unit and a turntable 7, the air cavity 1 comprises a chamber and an air pipe, the air pipe is connected to the bottom of the chamber, the upper guide sleeve 3 is hollowly sleeved on the inner wall of the lower end of the air pipe, the upper guide sleeve 3 can slide along the inner wall of the air pipe, the upper pneumatic pushing unit comprises a first cylinder 51, a second cylinder 52 and an upper push plate 53, the first cylinder 51 and the second cylinder 52 are respectively fixed to the outer wall of the air pipe, the telescopic rods of the first cylinder 51 and the second cylinder 52 are fixed to the upper push plate 53, and the upper push plate The plate 53 is fixed to the upper guide sleeve 3, and the connecting sleeve 2 is arranged directly below the air pipe. The lower guide sleeve 4 is hollowly sleeved on the inner wall of the upper end of the connecting sleeve 2, and the lower guide sleeve 4 can slide along the inner wall of the connecting sleeve 2. The lower pneumatic pushing unit includes a third cylinder 61, a fourth cylinder 62 and a lower push plate 63. The third cylinder 61 and the fourth cylinder 62 are respectively arranged on the outer wall of the connecting sleeve 2. The telescopic rods of the third cylinder 61 and the fourth cylinder 62 are fixed to the lower push plate 63, and the lower push plate 63 is fixed to the lower guide sleeve 4. The turntable 7 is arranged between the upper guide sleeve 3 and the lower guide sleeve 4, and nozzles 71 are arranged at the corresponding positions of the turntable 7 and the center holes of the upper guide sleeve 3 and the lower guide sleeve 4.

[0053] The air cavity 1 serves as a storage area for the test gas, and the test gas is ejected from the nozzle 71 and passes through the turntable 7, the fabric sample, the upper guide sleeve 3 and the air cavity 1 in sequence. In some specific embodiments, one end of the differential pressure gauge is connected to the air cavity 1, and the other end is connected to the cavity below the fabric sample, so as to measure the pressure difference between the upper surface and the lower surface of the fabric sample. The upper guide sleeve 3 is used to limit the movement direction of the upper half of the clamping device, and is also used to contact the fabric sample to provide a clamping force for it. The lower guide sleeve 4 is used to limit the movement direction of the lower half of the clamping device, and is also used to contact the fabric sample to provide a clamping force for it. The upper guide sleeve 3 and the lower guide sleeve 4 work together to complete the pressing of the fabric sample. The upper pneumatic push unit serves as a driving unit of the upper guide sleeve 3, drives the upper guide sleeve 3 to move, and also provides a continuous and stable supporting force when the fabric sample is pressed. Specifically, the upper pneumatic push unit includes a first cylinder 51, a second cylinder 52 and an upper push plate 53. The first cylinder 51 and the second cylinder 52 are relatively arranged on the outer wall of the trachea. The outer wall of the trachea serves as a supporting platform. The relative arrangement of the two cylinders provides a more stable and uniform supporting force, which can prevent the problem of excessive force on one side causing damage to the knitting turntable 7 due to air leakage. The first cylinder 51 and the second cylinder 52 move simultaneously through the telescopic rod to drive the upper push plate 53 to move, and the upper push plate 53 abuts against the upper guide sleeve 3, so that the upper guide sleeve 3 slides along the inner wall of the trachea.

[0054] The lower pneumatic push unit acts as a driving unit of the lower guide sleeve 4, drives the lower guide sleeve 4 to move, and also provides a continuous and stable supporting force when the fabric sample is pressed. Specifically, the upper pneumatic push unit includes a third cylinder 61, a fourth cylinder 62 and a lower push plate 63. The third cylinder 61 and the fourth cylinder 62 are relatively arranged on the outer wall of the connecting sleeve 2. The outer wall of the connecting sleeve 2 serves as a supporting platform. The supporting force provided by the relative arrangement of the two cylinders is more stable and uniform, which can prevent the problem of damage to the knitting turntable 7 caused by excessive force on one side. The third cylinder 61 and the fourth cylinder 62 move simultaneously to drive the lower push plate 63 to move through the telescopic rod, and the lower push plate 63 abuts against the lower guide sleeve 4, so that the lower guide sleeve 4 slides along the inner wall of the connecting sleeve 2. The upper pneumatic push unit and the lower pneumatic push unit simultaneously drive the upper guide sleeve 3 and the lower guide sleeve 4 to move closer to the middle, the upper guide sleeve 3 realizes the pressing effect, and the upper guide sleeve 3 realizes the supporting effect, thereby realizing the stable and reliable clamping of the fabric sample, which is convenient for the air permeability test experiment.

[0055] The present embodiment provides a pneumatic clamping device for an air permeability turntable, wherein the first cylinder 51 and the second cylinder 52 in the upper pneumatic pushing unit simultaneously provide driving force to push the upper push plate 53, and the upper guide sleeve 3 is driven by the upper push plate 53 to move downward along the air pipe of the air cavity 1 until it abuts against the fabric sample placed on the turntable 7, and at the same time, the third cylinder 61 and the fourth cylinder 62 in the lower pneumatic pushing unit provide driving force to push the lower push plate 63, and the lower guide sleeve 4 is driven by the lower push plate 63 to move up and down along the inner wall of the connecting sleeve 2 until it cooperates with the upper push plate 53 to press the fabric sample placed on the turntable 7, and after pressing, the nozzle 71 on the turntable 7 sprays air, and the gas passes through the air pipe and chamber of the air cavity 1 in turn to perform the fabric permeability test. In this solution, under the guidance of the upper guide sleeve 3 and the lower guide sleeve 4, the running path for pressing the fabric sample is more reliable and the fixing effect is good. In addition, the fabric sample is pressed on the upper and lower surfaces of the turntable 7 respectively through four groups of cylinders. Not only is the sealing effect good during the test, but the turntable 7 is also more evenly stressed and is not easily damaged. The test data is stable and reliable, and the air permeability conclusion is highly accurate.

[0056] See also Figure 2 As a preferred embodiment of the present invention, the pneumatic clamping device further includes a first sealing ring 31 and a second sealing ring 32. An annular groove is provided on the outer wall of the upper guide sleeve 3. The first sealing ring 31 is arranged in the annular groove and contacts the inner wall of the trachea. The second sealing ring 32 is arranged on the bottom surface of the upper guide sleeve 3. The setting of the annular groove facilitates the placement of the first sealing ring 31, and can also prevent the outer wall of the upper guide sleeve 3 from having a large friction with the inner wall of the trachea under the action of the first sealing ring 31, which may adversely affect the sliding of the upper guide sleeve 3. The first sealing ring 31 can prevent the gas from escaping from the gap between the upper guide sleeve 3 and the trachea, thereby affecting the test results. The setting of the second sealing ring 32 can further ensure the sealing between the upper guide sleeve 3 and the outer edge of the fabric sample, prevent gas leakage, and further ensure the accuracy of the test data. Specifically, the sealing ring can be a rubber gasket. In some other preferred embodiments, the pneumatic clamping device further includes a third sealing ring 41 and a fourth sealing ring 42. An annular groove is provided on the outer wall of the lower guide sleeve 4. The third sealing ring 41 is arranged in the annular groove and contacts the inner wall of the connecting sleeve 2. The fourth sealing ring 42 is arranged on the contact surface between the nozzle 71 and the turntable 7. The setting of the annular groove on the outer wall of the lower guide sleeve 4 is also convenient for the placement of the third sealing ring 41, and reduces the sliding friction between the lower guide sleeve 4 and the connecting sleeve 2 while ensuring the sealing between the two. The fourth sealing ring 42 prevents the gas from leaking from the gap between the nozzle 71 and the turntable 7, which affects the accuracy of the test results. In the above scheme, the sealing effect of the pneumatic clamping device is absolutely reliable, the test reliability is high, and the test results are very stable.

[0057] See also Figure 1 and Figure 2 As a preferred embodiment of the present invention, the pneumatic clamping device further includes a clamping block 8, which is clamped and fixed on the outer wall of the trachea, and the first cylinder 51 and the second cylinder 52 are both arranged on the clamping block 8. The clamping block 8 serves as a mounting platform for the first cylinder 51 and the second cylinder 52. The first cylinder 51 and the second cylinder 52 are more conveniently fixed to the outer wall of the trachea through the clamping block 8. The clamping block 8 and the trachea can be clamped, welded or bolted. In a specific embodiment, the upper pneumatic pushing unit further includes a fixing block 9, and the fixing block 9 is arranged between the telescopic rod of the first cylinder 51, the telescopic rod of the second cylinder 52 and the upper push plate 53. The fixing block 9 makes it easier to fix the first cylinder 51, the second cylinder 52 and the upper push plate 53, so as to realize the linkage between the push plate and the cylinder.

[0058] like Figure 1 In the embodiment shown, the pneumatic clamping device further includes a transmission plate 10, which is fixed to the outer wall of the coupling sleeve 2, and the third cylinder 61 and the fourth cylinder 62 are both arranged on the transmission plate 10. The transmission plate 10 serves as a mounting platform for the third cylinder 61 and the fourth cylinder 62, and provides support for the third cylinder 61 and the fourth cylinder 62. It also serves as a mounting and bearing platform for other components. In a specific embodiment, a cushion block 11 is further arranged between the third cylinder 61, the fourth cylinder 62 and the transmission plate 10.

[0059] like Figure 1 As shown, in a preferred embodiment, the pneumatic clamping device further includes a rotation drive mechanism, which includes a motor 121 and a rotation shaft 122. The motor 121 is fixed on the transmission plate 10, and the motor 121 is in transmission connection with the rotation shaft 122. The rotation shaft 122 passes through the transmission plate 10 and is fixed to the turntable 7. Figure 3As shown, the turntable 7 generally has through holes of different specifications and is provided with different nozzles 71. By changing the position of the turntable 7, the air permeability test of various fabric samples can be performed. The application range is wider, the use cost is low, and it can have stronger market competitiveness. The rotation drive mechanism is mainly used to drive the turntable 7 to rotate, thereby changing the specifications of the through holes on the turntable 7 between the upper guide sleeve 3 and the lower guide sleeve 4. Specifically, the rotation drive mechanism includes a motor 121 and a rotating shaft 122. The motor 121 serves as a power supply unit. The rotating shaft 122 is fixed to the turntable 7, and the rotating shaft 122 rotates to drive the turntable 7 to move. Specifically, the motor 121 and the rotating shaft 122 can be driven by gears or chains or belts. In a specific embodiment, a driving wheel 125 is sleeved on the output shaft of the motor 121, and a driven wheel 126 is sleeved on the rotating shaft 122. The driving wheel 125 and the driven wheel 126 are meshed and driven by a transmission wheel 127.

[0060] See also Figure 1 As a preferred embodiment of the present invention, the rotation drive mechanism further includes a bearing seat 123 and a connecting flange 124. The bearing seat 123 is sleeved outside the rotating shaft 122 and fixed to the transmission plate 10, and the connecting flange 124 connects the rotating shaft 122 and the transmission plate 10. The bearing seat 123 is provided to prevent the rotating shaft 122 from interfering with the transmission plate 10 in rotation, and also to ensure that the movement of the rotating shaft 122 is more stable. The setting of the connecting flange 124 makes it easier to fix the rotating shaft 122 and the turntable 7, with firm fixation, high connection efficiency, and simple disassembly and assembly for easy replacement.

[0061] like Figure 1As shown, as a preferred embodiment of the present invention, the pneumatic clamping device also includes a cleaning mechanism, which is used to remove dust from the nozzle 71 on the turntable 7 to prevent the nozzle 71 from being blocked and affecting the normal conduct of the air permeability test experiment. Specifically, the cleaning mechanism includes a bent plate 131, a mounting block 132 and an air nozzle 133. The bent plate 131 is fixed on the transmission plate 10, and the air nozzle 133 is fixed to the bent plate 131 through the mounting block 132. The nozzle of the air nozzle 133 is set downward, and the air nozzle 133 is connected to the external air source through the air supply pipe 134. The air nozzle 133 is used to spray downward. When the nozzle 71 on the turntable 7 moves to the bottom of the air nozzle 133, a certain pressure of gas is introduced into the air nozzle 133 through the air supply pipe 134, so that the dust in the nozzle 71 hole on the turntable 7 can be cleaned, thereby avoiding the influence of the test results due to the dust in the nozzle 71, and further ensuring the accuracy of the test results. The mounting section is used to fix the gas nozzle 133, and the bent plate 131 is used to fix the mounting block 132 and the transmission plate 10, thereby facilitating the installation of the gas nozzle 133. In a preferred embodiment, at least two nozzles 71 are evenly distributed on the turntable 7, and when the turntable 7 rotates, the nozzles 71 all pass under the cleaning mechanism gas nozzle 133. By reasonably arranging the gas nozzles 133, the nozzles 71 on the turntable 7 can all be cleaned, with a high degree of automation, which can reduce manual workload.

[0062] It should be noted that, although the above embodiments have been described in this article, the scope of patent protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the patent of the present invention.

Claims

1. A pneumatic clamping device for a breathable turntable, characterized in that: The pneumatic clamping device includes an air cavity, a connecting sleeve, an upper guide sleeve, a lower guide sleeve, an upper pneumatic pushing unit, a lower pneumatic pushing unit, a turntable, a first sealing ring and a second sealing ring. The air cavity includes a chamber and an air pipe. The air pipe is connected to the bottom of the chamber. The upper guide sleeve is hollowly sleeved on the inner wall of the lower end of the air pipe. The upper guide sleeve can slide along the inner wall of the air pipe. An annular groove is provided on the outer wall of the upper guide sleeve. The upper pneumatic pushing unit includes a first cylinder, a second cylinder and an upper push plate. The first cylinder and the second cylinder are respectively fixed to the outer wall of the air pipe. The telescopic rods of the first cylinder and the second cylinder are both fixed to the upper push plate. The upper push plate is fixed to the upper guide sleeve. The first cylinder and the second cylinder in the upper pneumatic pushing unit are fixed to the upper push plate. The driving force is provided to push the upper push plate, the connecting sleeve is arranged just below the trachea, the lower guide sleeve is hollowly sleeved on the inner wall of the upper end of the connecting sleeve, the lower guide sleeve can slide along the inner wall of the connecting sleeve, the lower pneumatic pushing unit comprises a third cylinder, a fourth cylinder and a lower push plate, the third cylinder and the fourth cylinder are respectively arranged on the outer wall of the connecting sleeve, the telescopic rods of the third cylinder and the fourth cylinder are fixed to the lower push plate, the lower push plate is fixed to the lower guide sleeve, the turntable is arranged between the upper guide sleeve and the lower guide sleeve, nozzles are arranged at the corresponding positions of the center holes of the turntable, the upper guide sleeve and the lower guide sleeve, the first sealing ring is arranged in the annular groove and contacts with the inner wall of the trachea, the second sealing ring is arranged on the bottom surface of the upper guide sleeve.

2. The pneumatic clamping device for a breathable turntable according to claim 1, characterized in that: The pneumatic clamping device also includes a third sealing ring and a fourth sealing ring. An annular groove is opened on the outer wall of the lower guide sleeve. The third sealing ring is arranged in the annular groove and contacts the inner wall of the connecting sleeve. The fourth sealing ring is arranged on the contact surface between the nozzle and the turntable.

3. The pneumatic clamping device for a breathable turntable according to claim 1, characterized in that: The pneumatic clamping device further comprises a clamping block, which is clamped and fixed on the outer wall of the air pipe, and the first cylinder and the second cylinder are both arranged on the clamping block.

4. The pneumatic clamping device for a breathable turntable according to claim 1, characterized in that: The upper pneumatic pushing unit further comprises a fixing block, and the fixing block is arranged between the telescopic rod of the first cylinder, the telescopic rod of the second cylinder and the upper pushing plate.

5. The pneumatic clamping device for a breathable turntable according to claim 1, characterized in that: The pneumatic clamping device also includes a transmission plate, which is fixed on the outer wall of the connecting sleeve, and the third cylinder and the fourth cylinder are both arranged on the transmission plate.

6. The pneumatic clamping device for a breathable turntable according to claim 5, characterized in that: The pneumatic clamping device also includes a rotation driving mechanism, which includes a motor and a rotating shaft. The motor is fixed on a transmission plate, the motor is in transmission connection with the rotating shaft, and the rotating shaft passes through the transmission plate and is fixed to the turntable.

7. The pneumatic clamping device for a breathable turntable according to claim 6, characterized in that: The rotary drive mechanism further includes a bearing seat and a connecting flange. The bearing seat is sleeved outside the rotary shaft and fixed to the transmission plate. The connecting flange connects the rotary shaft and the transmission plate.

8. The pneumatic clamping device for a breathable turntable according to claim 6, characterized in that: The pneumatic clamping device also includes a cleaning mechanism, which includes a bent plate, a mounting block and an air nozzle. The bent plate is fixed to the transmission plate, and the air nozzle is fixed to the bent plate through the mounting block. The nozzle of the air nozzle is set downward, and the air nozzle is connected to an external air source through an air supply pipe.

9. The pneumatic clamping device for a breathable turntable according to claim 8, characterized in that: At least two nozzles are evenly distributed on the rotating disk, and when the rotating disk rotates, the nozzles all pass under the air nozzle of the cleaning mechanism.

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