PTFE needled felt air permeability testing equipment

Abstract

The utility model discloses PTFE needled felt air permeability testing equipment, and belongs to the technical field of air permeability detection. The device mainly comprises a testing mechanism, the testing mechanism is provided with a support, the bottom end of the support is provided with a testing table, and the upper end face of the testing table is provided with a base plate; the top plate is installed at the upper end of the support, and an air cylinder is fixedly installed at the upper end of the top plate; the pipe sleeve is arranged at the lower end of the output shaft of the air cylinder, and the pipe sleeve is located over the base plate; the unwinding roller is arranged on one side of the base plate; the unwinding roller is arranged on one side of the base plate, the winding roller is arranged on one side of the base plate, a driving mechanism is arranged on one side of the winding roller, and the winding roller and the unwinding roller are used for straightening the PTFE needled felt to be tested. According to the PTFE needled felt air permeability testing equipment, when air permeability testing is carried out on a large-area needled felt, the large-area PTFE needled felt does not need to be cut, and the large-area PTFE needled felt does not need to be manually tightened and fixed to a testing table.

Description

Technical Field

[0001] The present application relates to the technical field of air permeability detection, and specifically to an air permeability testing device for PTFE needle-punched felt. Background Art

[0002] PTFE needled felt is a nonwoven material made from polytetrafluoroethylene (PTFE) fibers through a needle-punching process. Combining the excellent properties of PTFE with the structural characteristics of needled felt, it offers advantages such as chemical resistance, high temperature resistance, air permeability, filtration performance, strength, and flexibility, making it widely used in various industrial fields.

[0003] The commonly used PTFE needle-punched felt air permeability test on the market is mainly conducted using the differential pressure method. When conducting an air permeability test on PTFE needle-punched felt, the PTFE needle-punched felt sample is usually first clamped and fixed on the test bench using a detachable test cavity. Then, a certain pressure of gas is applied to the test cavity. By measuring the pressure changes on both sides of the test cavity, the amount of gas passing through a unit area of ​​the material per unit time, i.e., the gas permeability, is calculated.

[0004] After searching, for example, the patent with authorization announcement number CN209471022U specifically discloses a fabric air permeability detection device. The patent achieves sealing and fixation through a first sealing gasket and a second sealing gasket to ensure that there will be no air leakage around during detection.

[0005] However, when existing testing equipment is used to test a large area of ​​PTFE needle felt, in order to obtain the air permeability of the PTFE needle felt in a locally stretched and straightened state, it is necessary to cut a small area of ​​PTFE needle felt from the large area of ​​PTFE needle felt, and then manually tighten and fix it on the test table. This testing method is not only cumbersome, but also results in the waste of the small area of ​​PTFE needle felt after testing. Therefore, it is necessary to provide a PTFE needle felt air permeability testing equipment to solve the above problems.

[0006] It should be noted that the above information disclosed in this Background section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the Invention

[0007] Based on the above-mentioned problems existing in the prior art, the problem to be solved by this application is: to provide a PTFE needle-punched felt air permeability testing device, which achieves the goal of not having to cut the large-area PTFE needle-punched felt when conducting air permeability testing on the large-area needle-punched felt, nor having to manually tighten and fix it on the test bench.

[0008] The technical solution adopted by the present application to solve the technical problem is: a PTFE needle-punched felt air permeability testing device, comprising:

[0009] A testing mechanism, comprising a bracket, a testing table mounted on the bottom end of the bracket, and a base plate disposed on the upper end surface of the testing table;

[0010] A top plate, which is mounted on the upper end of the bracket, and a cylinder is fixedly mounted on the upper end of the top plate;

[0011] a pipe sleeve, the pipe sleeve being arranged at the lower end of the output shaft of the cylinder, and the pipe sleeve being located directly above the base plate;

[0012] an unwinding roller, the unwinding roller being arranged on one side of the base plate;

[0013] A winding roller is provided on one side of the base plate. A driving mechanism is provided on one side of the winding roller. The winding roller and the unwinding roller are used to straighten the PTFE needle-punched felt to be tested.

[0014] Furthermore, a column is fixedly installed on one side of the test bench, a bearing seat is fixedly installed on one side of the column, a support rod is fixedly installed inside the bearing seat, and the unwinding roller is sleeved on the outside of the support rod.

[0015] Furthermore, a protective sleeve is fixedly installed on the outer shell of the bearing seat, and the protective sleeve is arranged toward the direction of the support rod. A spring telescopic part is fixedly installed on the inner side of the protective sleeve. A turntable is fixedly installed on the outer side of one end of the support rod close to the bearing seat, and a groove is provided on the outer side of the turntable, and the groove cooperates with the spring telescopic part.

[0016] Furthermore, a matching strip is fixedly installed on the outer side of the support rod, a matching groove is opened on the inner wall of the unwinding roller, the matching groove and the matching strip cooperate with each other, and a baffle is threadedly connected to the outer end of the support rod.

[0017] Furthermore, the driving mechanism has a fixed platform fixedly mounted on one side of the test bench, the lower end of the fixed platform is rotatably connected to a connecting shaft, the winding roller is fixed on the connecting shaft, the upper end of the fixed platform is fixedly mounted with a driving motor, a driving sprocket is fixedly mounted on the output shaft of the driving motor, a transmission sprocket is fixedly mounted on the other end of the connecting shaft, and a chain is connected between the transmission sprocket and the driving sprocket.

[0018] Furthermore, a first rubber pad is fixedly mounted on the upper end of the base plate, and a second rubber pad is fixedly mounted on the lower end of the pipe sleeve.

[0019] Furthermore, a gas flow controller is provided inside the tube sleeve.

[0020] The beneficial effects of the present application are as follows: the present application provides a PTFE needle-punched felt air permeability testing device, which is provided with a unwinding roller and a driving mechanism, and starts the cylinder to drive the tube sleeve downward and fit it with the base plate, and then the gas flow controller starts to blow toward the PTFE needle-punched felt, thereby detecting the air pressure in the detection cavity at the tube sleeve and the base plate through the first pressure detector and the second pressure detector, and completing the air permeability test of the large-area PTFE needle-punched felt. Therefore, when performing the air permeability test on the large-area needle-punched felt, there is no need to cut the large-area PTFE needle-punched felt, nor to manually tighten and fix it on the test bench, thereby improving the detection efficiency and preventing the small-area PTFE needle-punched felt that has been tested from being wasted.

[0021] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0023] In the attached figure:

[0024] Figure 1 This is an overall schematic diagram of a PTFE needle-punched felt air permeability testing device in this application;

[0025] Figure 2 for Figure 1 Schematic diagram of the overall structure from different perspectives;

[0026] Figure 3 for Figure 2 Schematic diagram of the separate decomposition of the middle unwinding roller;

[0027] Among them, the reference numerals in the figures are:

[0028] 1. Test mechanism; 11. Bracket; 12. Test bench; 13. Top plate; 14. Base plate; 15. Cylinder; 16. Press plate; 17. Movable rod; 18. Pipe sleeve;

[0029] 2. Unwinding roller; 21. Column; 22. Bearing seat; 23. Support rod; 24. Matching groove; 25. Matching strip; 26. Baffle; 27. Protective cover; 271. Spring expansion member; 28. Turntable; 281. Groove;

[0030] 3. Winding roller;

[0031] 4. Driving mechanism; 41. Fixed platform; 42. Connecting shaft; 43. Driving motor; 44. Driving sprocket; 45. Chain. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0034] like Figure 1 As shown, the present application provides a PTFE needle-punched felt air permeability testing device, comprising a testing mechanism 1, the testing mechanism 1 having a bracket 11, a testing table 12 fixedly mounted at the bottom end of the bracket 11, a base plate 14 provided on the upper end surface of the testing table 12, a first pressure detector provided inside the base plate 14, and the pressure inside the base plate 14 is detected by the first pressure detector;

[0035] At the same time, a top plate 13 is fixedly mounted on the upper end of the bracket 11, and a cylinder 15 is fixedly mounted on the upper end of the top plate 13. The output shaft of the cylinder 15 passes through the top plate 13, and a pressure plate 16 is provided at the lower end of the top plate 13. The pressure plate 16 is fixedly mounted on the output shaft of the cylinder 15, and a pipe sleeve 18 is fixedly mounted on the lower end of the pressure plate 16. The pipe sleeve 18 is located just above the base plate 14. A second pressure detector is provided in the pipe sleeve 18 to detect the pressure in the pipe sleeve 18 by the second pressure detector. Therefore, starting the cylinder 15 can push the top plate 13 downward, and the pipe sleeve 18 is then moved downward until it fits with the base plate 14. At this time, the pipe sleeve 18 and the base plate 14 form a detection cavity.

[0036] In the present application, a gas flow controller (not shown) is provided inside the tube sleeve 18. The gas flow controller is a prior art and provides gas to the detection cavity.

[0037] In order to ensure the movement stability of the pipe sleeve 18, two sets of movable rods 17 are fixedly installed on the upper end of the pressure plate 16. The two sets of movable rods 17 are arranged on both sides of the cylinder 15 and pass through the top plate 13. Therefore, when the pipe sleeve 18 moves up and down, the movable rods 17 move accordingly.

[0038] In this application, a first rubber pad is fixedly installed on the upper end of the base plate 14, and a second rubber pad is fixedly installed on the lower end of the tube sleeve 18. When the tube sleeve 18 is pressed downward against the base plate 14, the first rubber pad and the second rubber pad clamp the PTFE needle-punched felt, thereby improving the sealing of the detection cavity.

[0039] like Figure 2 As shown, in order to test large-area PTFE needle-punched felt, a reel 2 is provided on one side of the base plate 14, and a reel 3 is provided on the other side of the base plate 14. A drive mechanism 4 is provided on one side of the reel 3. The drive mechanism 4 has a fixed platform 41 fixedly mounted on one side of the test table 12. The lower end of the fixed platform 41 is rotatably connected to a connecting shaft 42, and the reel 3 is fixed on the connecting shaft 42.

[0040] In addition, a drive motor 43 is fixedly installed on the upper end of the fixed platform 41, a drive sprocket 44 is fixedly installed on the output shaft of the drive motor 43, and a transmission sprocket (not marked in the figure) is fixedly installed on the other end of the connecting shaft 42. A chain 45 is connected between the transmission sprocket and the drive sprocket 44, so starting the drive motor 43 can drive the connecting shaft 42 and the winding roller 3 to rotate through the chain 45.

[0041] In order to fix the unwinding roller 2, a column 21 is fixedly installed on one side of the test bench 12. Figure 3 As shown, a bearing seat 22 is fixedly installed on one side of the column 21, and a support rod 23 is fixedly installed inside the bearing seat 22. The unwinding roller 2 is sleeved on the outside of the support rod 23. In this application, the support rod 23 protrudes from the bearing seat 22 and can rotate in the bearing seat 22.

[0042] At the same time, a matching strip 25 is fixedly installed on the outer side of the support rod 23, and a matching groove 24 is opened on the inner wall of the unwinding roller 2. The matching groove 24 and the matching strip 25 cooperate with each other. The outer end of the support rod 23 is threadedly connected to a baffle 26. The baffle 26 is detachable. Therefore, when installing the unwinding roller 2, the baffle 26 is first removed, and then the matching groove 24 is aligned with the matching strip 25, so that the unwinding roller 2 is assembled to the support rod 23, so that it rotates together with the support rod 23;

[0043] In order to prevent the unwinding roller 2 from rotating when it is not under force, a protective sleeve 27 is fixedly installed on the outer shell of the bearing seat 22. The protective sleeve 27 is arranged toward the support rod 23, and multiple groups of spring telescopic parts 271 are fixedly installed on the inner side of the protective sleeve 27. At the same time, a turntable 28 is fixedly installed on the outer side of one end of the support rod 23 close to the bearing seat 22. Multiple groups of grooves 281 are provided on the outer side of the turntable 28, and the grooves 281 cooperate with the spring telescopic parts 271.

[0044] In summary, when a large area of ​​PTFE needle felt needs to be tested, the PTFE to be tested is first wound around the unwinding roller 2, and then the unwinding roller 2 is installed. The PTFE needle felt is pulled out and passed through the base plate 14, and finally wound around the take-up roller 3. At this time, the drive motor 43 is started to drive the take-up roller 3 to rotate.

[0045] When the winding roller 3 rotates, the unwinding roller 2 and the support rod 23 are driven to rotate simultaneously through the PTFE needle felt. When the winding roller 3 stops rotating, the unwinding roller 2 also stops unwinding due to the cooperation between the groove 281 and the spring expansion member 271, thereby straightening the PTFE needle felt. After the straightening, the driving motor 43 is paused.

[0046] Then the air cylinder 15 is started to drive the sleeve 18 downward and fit it with the base plate 14. Then the gas flow controller is started to blow toward the PTFE needle felt, so that the air pressure in the detection cavity at the sleeve 18 and the base plate 14 is detected by the first pressure detector and the second pressure detector. Finally, the data is collected and compared. If multiple tests are performed, the above operation can be repeated to complete the air permeability test of the large-area PTFE needle felt. Therefore, when performing the air permeability test on the large-area needle felt, there is no need to cut the large-area PTFE needle felt, nor to manually tighten and fix it on the test table 12, thereby improving the detection efficiency and preventing the small-area PTFE needle felt that has been tested from being wasted.

[0047] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A PTFE needle-punched felt air permeability testing device, characterized by: include: A testing mechanism (1), the testing mechanism (1) comprising a bracket (11), a testing table (12) being mounted on the bottom end of the bracket (11), and a base plate (14) being provided on the upper end surface of the testing table (12); A top plate (13), the top plate (13) being mounted on the upper end of the bracket (11), and a cylinder (15) being fixedly mounted on the upper end of the top plate (13); a pipe sleeve (18), the pipe sleeve (18) being arranged at the lower end of the output shaft of the cylinder (15), the pipe sleeve (18) being located directly above the base plate (14); an unwinding roller (2), the unwinding roller (2) being arranged on one side of the base plate (14); A winding roller (3) is provided on one side of the base plate (14); a driving mechanism (4) is provided on one side of the winding roller (3); the winding roller (3) and the unwinding roller (2) are used to straighten the PTFE needle-punched felt to be tested.

2. The PTFE needle felt air permeability testing device according to claim 1, characterized in that: A column (21) is fixedly mounted on one side of the test bench (12), a bearing seat (22) is fixedly mounted on one side of the column (21), a support rod (23) is fixedly mounted inside the bearing seat (22), and the unwinding roller (2) is sleeved on the outside of the support rod (23).

3. The PTFE needle felt air permeability testing device according to claim 2, characterized in that: A protective sleeve (27) is fixedly mounted on the outer shell of the bearing seat (22), and the protective sleeve (27) is arranged toward the support rod (23). A spring telescopic member (271) is fixedly mounted on the inner side of the protective sleeve (27). A turntable (28) is fixedly mounted on the outer side of one end of the support rod (23) close to the bearing seat (22). A groove (281) is provided on the outer side of the turntable (28), and the groove (281) cooperates with the spring telescopic member (271).

4. The PTFE needle felt air permeability testing device according to claim 3, characterized in that: A matching strip (25) is fixedly installed on the outer side of the support rod (23), and a matching groove (24) is provided on the inner wall of the unwinding roller (2). The matching groove (24) and the matching strip (25) cooperate with each other, and a baffle (26) is threadedly connected to the outer end of the support rod (23).

5. The PTFE needle felt air permeability testing device according to claim 1, characterized in that: The driving mechanism (4) comprises a fixed platform (41) fixedly mounted on one side of the test bench (12); the lower end of the fixed platform (41) is rotatably connected to a connecting shaft (42); the winding roller (3) is fixed on the connecting shaft (42); a driving motor (43) is fixedly mounted on the upper end of the fixed platform (41); a driving sprocket (44) is fixedly mounted on the output shaft of the driving motor (43); a transmission sprocket is fixedly mounted on the other end of the connecting shaft (42); and a chain (45) is transmission-connected between the transmission sprocket and the driving sprocket (44).

6. The PTFE needle felt air permeability testing device according to claim 1, characterized in that: A first rubber pad is fixedly mounted on the upper end of the base plate (14), and a second rubber pad is fixedly mounted on the lower end of the pipe sleeve (18).

7. The PTFE needle felt air permeability testing device according to claim 1, characterized in that: A gas flow controller is provided inside the pipe sleeve (18).

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