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CN-224224514-U - Biaxial stretching device of PTFE filtration membrane

CN224224514UCN 224224514 UCN224224514 UCN 224224514UCN-224224514-U

Abstract

The utility model provides a bidirectional stretching device of a PTFE filtering membrane, which comprises a workbench, wherein four movable frames are fixedly connected to the top of the workbench, movable grooves are formed in the tops of the four movable frames, threaded rods are rotatably connected to the inner walls of the movable grooves, and movable blocks are connected to the outer walls of the threaded rods in a threaded manner. According to the utility model, through the cooperation of the structures such as the movable frame, the variable-pitch frame, the driving assembly and the variable-pitch assembly, synchronous stretching in four directions can be performed through the electric clamping jaw, so that the stress uniformity of the filtering membrane in the stretching process can be ensured, the stress concentration phenomenon possibly caused by traditional unidirectional or bidirectional stretching is avoided, the risk of uneven or broken membrane hole structures can be reduced, the membrane material has better physical properties after stretching, meanwhile, the stretching distance of the clamping jaw can be adjusted according to the requirement through the equidistant variable-pitch design of the variable-pitch assembly, and the balanced stress in the stretching process is ensured, so that the stretching of each region of the membrane material is consistent.

Inventors

  • CHEN LU

Assignees

  • 南京英斯瑞德高分子材料股份有限公司

Dates

Publication Date
20260512
Application Date
20250522

Claims (8)

  1. 1. The utility model provides a two-way stretching device of PTFE filtration membrane, includes workstation (1), its characterized in that, the top fixedly connected with of workstation (1) four remove frame (2), four remove the top of frame (2) and all seted up removal groove (3), the inner wall rotation of removal groove (3) is connected with threaded rod (4), the outer wall threaded connection of threaded rod (4) has movable block (5), be provided with the drive assembly that can drive four movable blocks (5) synchronous movement simultaneously on workstation (1), the interior top surface fixedly connected with displacement frame (6) of movable block (5), the inner wall fixedly connected with two guide bars (7) of displacement frame (6), two the outer wall of guide bar (7) all the common sliding connection of a plurality of displacement piece (8), one side fixedly connected with electric motor (9) of displacement piece (8), one side fixedly connected with driving box (10) of displacement frame (6), one side of driving box (10) is provided with can drive clamping jaw (8) the top of two support frame (12) of displacement piece, two support frame (12) are connected with the top of two support frame (12) and are connected with restriction frame (12).
  2. 2. The bi-directional stretching device of a PTFE filtration membrane according to claim 1, wherein the driving assembly comprises a first servo motor (13) fixedly installed at the bottom of the workbench (1), an output end of the first servo motor (13) rotates and penetrates through the outside of the workbench (1) and is fixedly connected with a rotating shaft (14), an outer wall of the rotating shaft (14) is fixedly connected with a driving bevel gear (15), and a top end of the rotating shaft (14) is rotatably connected with a protection frame (16).
  3. 3. The bi-directional stretching device of the PTFE filtration membrane according to claim 2, wherein four driven bevel gears (17) are connected to the outer wall of the drive bevel gear (15) in a meshed manner, and driven shafts (18) are fixedly connected to the interiors of the four driven bevel gears (17).
  4. 4. The bi-directional stretching device of a PTFE filtration membrane according to claim 1, wherein the distance-changing assembly comprises a second servo motor (19) fixedly installed on one side of the driving box (10), and an output end of the second servo motor (19) rotates and penetrates into the driving box (10) and is fixedly connected with a worm (20).
  5. 5. The bi-directional stretching device of a PTFE filtration membrane according to claim 4, wherein the outer wall of the worm (20) is engaged with and connected with a worm wheel (21), the inside of the worm wheel (21) is fixedly connected with a connecting shaft (22), and one end of the connecting shaft (22) rotates and penetrates into the inside of the variable-pitch frame (6) and is fixedly connected with a variable-pitch rod (23).
  6. 6. The bi-directional stretching device of a PTFE filtration membrane according to claim 5, wherein a plurality of distance changing grooves (24) are formed in the outer wall of the distance changing rod (23), and limiting columns (25) are connected inside the distance changing grooves (24) in a sliding mode.
  7. 7. The bidirectional stretching device of the PTFE filtering membrane according to claim 1, wherein the temperature assembly comprises a heating plate (26) fixedly installed at the bottom ends of the two guide rods (7), a plurality of heating wires (27) are fixedly installed in the heating plate (26), a lifting screw (28) is rotatably connected to the top of the heating plate (26), a driving disc (29) is fixedly connected to the top of the lifting screw (28), and the outer wall of the lifting screw (28) is in threaded connection with the supporting frame (11).
  8. 8. The bi-directional stretching device of a PTFE filtration membrane according to claim 1, wherein a controller (30) is fixedly installed on the top of the workbench (1).

Description

Biaxial stretching device of PTFE filtration membrane Technical Field The utility model relates to the technical field of PTFE (polytetrafluoroethylene) filtering membranes, in particular to a bidirectional stretching device of a PTFE filtering membrane. Background Polytetrafluoroethylene (PTFE) is a high performance material with excellent chemical stability, high temperature resistance, corrosion resistance, low coefficient of friction, and good electrical insulation. Because of these excellent properties, PTFE membranes are widely used in filtration, membrane, electrical insulation, gas separation, etc., and exhibit incomparable advantages especially in applications requiring high temperature, highly corrosive environments. While Biaxially Oriented Polypropylene (BOP) was first applied to polyester films (e.g., BOPET film), it is increasingly being applied to other polymeric materials, including PTFE, due to its excellent stretching properties and improved film properties. The two-way stretching of the PTFE membrane can greatly improve the porosity, strength and ductility of the membrane, so that the filtering efficiency and the service life of the PTFE membrane are improved. However, because the molecular structure of PTFE is special, the flexibility of the material is poor, and the original structural stability is lost at high temperature, so that the biaxial stretching process of the PTFE film is more complex than other materials. In the stretching process, parameters such as heating temperature, stretching ratio, stretching speed and the like need to be strictly controlled, otherwise, film breakage or non-uniform stretching is easily caused. The utility model patent in China with the application number of 202122241496.X discloses a bidirectional stretching device of a PTFE filtering membrane, which comprises an operation table, a membrane body arranged at the top end of the operation table, a membrane rolling piece arranged at the tail end of the membrane body, a transverse stretching mechanism arranged at the bottom end of the operation table and a longitudinal stretching mechanism arranged on the side surface of the operation table, wherein the transverse stretching mechanism comprises a first motor, the side surface of the first motor is coaxially connected with a transverse rotating shaft, the side surface of the transverse rotating shaft is connected with a plurality of connecting shafts, the connecting shafts are sleeved with transverse sleeve shafts, the longitudinal stretching mechanism comprises a second motor, and the side surface of the second motor is connected with a longitudinal rotating shaft. According to the utility model, through the transverse stretching mechanism and the longitudinal stretching mechanism, the first motor drives the transverse rotating shaft to rotate, drives the transverse sleeve shaft to rotate and pushes and stretches the transverse position of the film body, and the longitudinal stretching mechanism stretches the film body longitudinally, so that the stretching efficiency is improved, and meanwhile, the surface smoothness of the film body is ensured. Although the above-mentioned scheme can carry out stretching to filtration membrane, but the device will stretch and divide into two stages, transversely stretch earlier and then vertically stretch, every stage all needs to adjust independently and operate, this kind of mode can lead to overall production efficiency to reduce, because the stretching of every direction needs to carry out independently, can not go on simultaneously, thereby prolonged the time of whole stretching process, simultaneously the both ends of membrane can lead to the deformation of different degree because transversely stretch earlier and then vertically stretch, thereby can arouse membrane surface stretching inhomogeneous, and filtration membrane needs the heat softening in the stretching process, if the temperature is insufficient, can lead to stretching inhomogeneous or membrane fracture, the high temperature can cause the material to decompose, therefore the biaxial stretching device of PTFE filtration membrane is proposed to solve above-mentioned problem. Disclosure of utility model The utility model aims to overcome the defects in the prior art, and provides a bidirectional stretching device of a PTFE filtering membrane. In order to solve the technical problems, the automatic control device comprises a workbench, wherein four moving frames are fixedly connected to the top of the workbench, moving grooves are formed in the tops of the four moving frames, threaded rods are rotatably connected to the inner walls of the moving grooves, moving blocks are connected to the outer walls of the threaded rods in a threaded mode, driving components capable of simultaneously driving the four moving blocks to synchronously move are arranged on the workbench, a distance changing frame is fixedly connected to the inner top surface of the moving block