Polyvinylidene fluoride primary membrane drying device

Abstract

The invention discloses a polyvinylidene fluoride primary membrane drying device, and belongs to the technical field of microfiltration membrane manufacturing equipment.The polyvinylidene fluoride primary membrane drying device comprises a drying box arranged on a rack, two drying assemblies are arranged in the drying box, and each drying assembly comprises two hot oil internal heating type heating plates which are vertically and symmetrically arranged relative to a primary membrane; the drying assembly reciprocates in the drying box, when the moving direction of the drying assembly is the same as the moving direction of the primary membrane, the moving speed of the drying assembly is the same as the moving speed of the primary membrane, the primary membrane is clamped by two hot oil internal heating plates of the drying assembly, and when the moving direction of the drying assembly is opposite to the moving direction of the primary membrane, the primary membrane is dried. Two hot oil internal heating type heating plates of the drying assembly do not clamp the primary film, a driving motor is arranged on the machine frame, and the driving motor and a front supporting roller on the machine frame are in transmission through a chain wheel and chain assembly. The drying device solves the problem that a primary membrane is dried unevenly and insufficiently due to the fact that the air supply temperature is uneven when hot air is adopted for drying.

Description

Technical Field

[0001] The present invention belongs to the technical field of microporous membrane manufacturing equipment, and particularly relates to a polyvinylidene fluoride primary membrane drying device. Background Art

[0002] Polyvinylidene fluoride (PVDF) ultrafiltration membranes are widely used in water treatment, biopharmaceuticals, food industry and other fields due to their excellent chemical stability, pollution resistance and mechanical strength. When producing polyvinylidene fluoride primary membranes, the phase inversion method is mainly adopted, which mainly includes five steps: polymer solution preparation, film scraping and forming, pre-evaporation, coagulation bath immersion, and post-treatment. Among them, post-treatment includes water washing to remove residual solvents, hydrophilic treatment, and drying. Drying is a key step in the preparation process, directly affecting its pore structure, mechanical properties and filtration efficiency. In the prior art, when drying by hot air drying, the temperature needs to be controlled at 40-60°C, and uniform air supply is required to avoid local overheating. However, in actual situations, the air supply outlet is fixed, and generally, the temperature at the air supply outlet is too high. As the hot air circulates to dry the primary membrane, it is impossible to ensure uniform temperature, resulting in uneven drying, too fast local drying rate, surface hardening, internal stress concentration, and stress accumulation caused by the difference in drying rate between the membrane surface and the inside. When the stress exceeds the material strength, cracks will occur. Therefore, the problems that occur in the drying of the prior art need to be further improved. Summary of the Invention

[0003] The purpose of the present invention is to propose a polyvinylidene fluoride primary membrane drying device to solve the problem of uneven drying and insufficient drying of the polyvinylidene fluoride primary membrane caused by uneven air supply temperature during hot air drying in the production of polyvinylidene fluoride primary membranes in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a polyvinylidene fluoride primary film drying device, comprising a drying box arranged on a frame and a drying mechanism arranged inside the drying box, a mounting frame is slidably arranged in the drying box, the drying mechanism comprises a plurality of drying components arranged on the mounting frame, the drying components comprise two hot oil internal heating heating plates symmetrically arranged about the primary film, the drying components reciprocate in the drying box, when the moving direction of the drying components is the same as the moving direction of the primary film, the moving speed of the drying components is the same as the moving speed of the primary film, and the two hot oil drying components are arranged in a direction that is equal to the moving direction of the primary film. The internal heating plate clamps the nascent film. When the moving direction of the drying component is opposite to that of the nascent film, the two hot oil internal heating plates of the drying component do not clamp the nascent film. The frame is also provided with a front support roller and a rear support roller. The front support roller is arranged in front of the drying box, and the rear support roller is arranged behind the drying box. The frame is provided with a driving motor. The driving motor and the front support roller are driven by a sprocket chain assembly. The front end of the drying box is provided with an inlet, and the rear end is provided with an outlet. The nascent film enters through the inlet after passing through the front support roller, flows out from the outlet after drying, and is rolled up after passing through the rear support roller. As a further description of the above technical solution: the drying box is also provided with a hot air circulation system, and the hot air circulation system includes an air inlet channel, an air outlet channel and a blower. One end of the air inlet channel is connected to the inside of the drying box, and the other end is connected to the air outlet of the blower. One end of the air outlet channel is connected to the inside of the drying box, and the other end is connected to the air inlet of the blower. An electric heating wire is provided in the air inlet channel.

[0005] As a further description of the above technical solution: the drying mechanism also includes a driving assembly, the driving assembly is used to drive the mounting frame to reciprocate in the drying box, the driving assembly includes a driving gear, a forward driven gear and a reverse driven gear meshing with the driving gear, the forward driven gear and the reverse driven gear are symmetrically arranged about the driving gear, the forward driven gear is coaxially provided with a forward driving non-full tooth, the reverse driven gear is coaxially provided with a reverse driving non-full tooth, and a reverse driving non-full tooth is arranged between the forward driving non-full tooth and the reverse driving non-full tooth. A driven double-sided rack is provided. When the forward drive non-full teeth are meshed with the driven double-sided rack, the reverse drive non-full teeth are not meshed with the driven double-sided rack. When the reverse drive non-full teeth are meshed with the driven double-sided rack, the forward drive non-full teeth are not meshed with the driven double-sided rack. The driven double-sided rack is fixedly connected to the mounting frame. A first linear bearing is provided on the side of the driven double-sided rack. A first slide rail adapted to the first linear bearing is provided on the inner wall of the drying box. The rotating shaft of the driving gear and the front support roller are transmitted through a sprocket chain assembly.

[0006] As a further description of the above technical solution: a second slide rail is vertically arranged on the mounting frame, a connecting frame is arranged at the end of the hot oil internal heating plate, a second linear bearing sliding along the second slide rail is arranged on the connecting frame, and a clamping state switching component is arranged between the connecting frame and the drying box. The clamping state switching component is used to drive the two hot oil internal heating plates to move.

[0007] As a further description of the above technical solution: the clamping state switching component includes an elastic driving column fixedly arranged on the connecting frame and an orbital plate fixedly arranged on the side wall of the drying box. A track groove corresponding to the elastic driving column is formed on the orbital plate. The track groove is divided into a first sliding groove and a second sliding groove. The first sliding groove and the second sliding groove form a parallelogram groove that is connected end to end. The first sliding groove and the second sliding groove are centrosymmetric about the center of the orbital plate. The groove depth at the end of the first sliding groove is less than the groove depth at the beginning of the second sliding groove, and the groove depth at the end of the second sliding groove is less than the groove depth at the beginning of the first sliding groove.

[0008] As a further description of the above technical solution: two groups of drying components are arranged in the drying box, and the two groups of drying components are arranged one in front of the other. The width of the hot oil internal heating plate of the drying component is one unit length, and the distance between the two groups of drying components is two unit lengths.

[0009] As a further description of the above technical solution: the width of the hot oil internal heating plate of the group of drying components located at the rear is greater than one unit length.

[0010] As a further description of the above technical solution: a shaping component is arranged behind the group of drying components located at the rear. The shaping component is used to shape the dried primary film. The shaping component includes a group of symmetrically arranged shaping rollers up and down. The shaping rollers are rotatably arranged on the mounting frame. A driving shaft is rotatably arranged on the mounting frame. The driving shaft and the shaping rollers are connected by a connecting arm. A rotating gear is coaxially arranged on the driving shaft. A driving rack is arranged on the hot oil internal heating plate. The driving rack meshes with the rotating gear. When the hot oil internal heating plate does not clamp the primary film, the upper and lower shaping rollers are in a state of clamping the primary film. When the hot oil internal heating plate clamps the primary film, the shaping rollers are in a state of being away from the primary film.

[0011] As a further description of the above technical solution: an electric heating heat-conducting oil furnace is arranged on the drying box. The electric heating heat-conducting oil furnace and the hot oil internal heating plate are connected and form a loop through an oil pipe. A high-temperature oil pump is arranged on the oil pipe.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0013] The hot press electric heating heat transfer oil furnace heats the heat transfer oil to the required temperature, and then circulates it through a high-temperature oil pump to evenly transfer the heat energy to heat-using equipment such as hot presses. A temperature-sensing probe is installed inside the system to ensure precise temperature control. High thermal efficiency and energy saving: Compared with traditional steam heating, the thermal efficiency of the hot press electric heating heat transfer oil furnace can be as high as 90%, significantly reducing energy waste. During the heat transfer oil circulation heating process, the heat loss is extremely small, while there is about 20% heat loss in steam heating.

[0014] (1) After preheating the primary film in the drying oven through a hot air circulation system, a hot oil internal heating plate is used for surface contact heating and drying. Compared with traditional steam heating, the thermal efficiency of the hot oil internal heating plate can be as high as 90%, significantly reducing energy waste. At the same time, the temperature is controlled to ensure the drying effect. The two hot oil internal heating plates can make the primary film tighter through the clamping method. The hot oil internal heating plate moves synchronously with the primary film to avoid friction with it, just protecting its structure.

[0015] (2) Multiple groups of drying components are adopted, and the width of the hot oil internal heating plate in the latter group is greater than that in the former group, which can conduct contact drying on the entire range of the primary film without omission. At the same time, it can repair the fine indentations generated when the former group of hot oil internal heating plates clamp.

[0016] (3) The set shaping component can shape all the dried primary films by rolling. The shaping roller only contacts and rolls the primary film when moving in the opposite direction to the movement direction of the primary film. Therefore, it will not always be in line contact with the primary film within a unit time, avoiding the primary film generating indentations again due to long-term line contact. Description of the Drawings

[0017] Figure 1 is a side view of the present invention;

[0018] Figure 2 is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 3 is a schematic diagram of the partial sectional state of the present invention, in which the hot air circulation system is not shown;

[0020] Figure 4 is Figure 3 the enlarged view of part A in

[0021] Figure 5 is a three-dimensional structural schematic diagram of the drying mechanism of the present invention;

[0022] Figure 6 is an exploded view of the drying mechanism of the present invention;

[0023] Figure 7 For Figure 6 the enlarged view at position B in

[0024] Figure 8 Schematic diagram of the explosion structure of the elastic drive column of the present invention;

[0025] Figure 9 Side view of the track slab of the present invention.

[0026] Legend description:

[0027] 10, primary film;

[0028] 20, drying oven; 21, inlet; 22, outlet;

[0029] 30, frame; 31, front support roller; 32, rear support roller;

[0030] 40, hot air circulation system; 41, air inlet channel; 42, air outlet channel; 43, blower;

[0031] 50, drying mechanism; 51, mounting rack; 511, drive shaft; 52, drying assembly; 521, hot oil internal heating plate; 522, electric heating heat transfer oil furnace; 523, high-temperature oil pump;

[0032] 60, drive gear; 61, forward driven gear; 62, reverse driven gear; 63, forward drive non-full tooth; 64, reverse drive non-full tooth; 65, driven double-sided rack; 66, first linear bearing; 67, first slide rail;

[0033] 71, second slide rail; 72, connecting frame; 73, second linear bearing;

[0034] 80, clamping state switching assembly; 81, elastic drive column; 811, connecting shaft; 812, cap; 813, spring; 82, track slab; 83, first chute; 84, second chute;

[0035] 90, shaping assembly; 91, shaping roller; 92, connecting arm; 93, rotating gear; 94, drive rack. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] Please refer to Figures 1-9 , the present invention provides a technical solution for a polyvinylidene fluoride primary film drying device:

[0038] A polyvinylidene fluoride primary membrane drying device is used for drying the polyvinylidene fluoride primary membrane 10 manufactured by the phase inversion method. The drying temperature of the polyvinylidene fluoride primary membrane 10 needs to be set at 40 - 60 °C to maintain the pore morphology, avoid collapse or shrinkage, protect the thermal stability of the polymer material and additives, and at the same time, it needs to adapt to the energy consumption and efficiency requirements of industrial production.

[0039] The polyvinylidene fluoride primary membrane 10 drying device includes a drying box 20 arranged on a frame 30. An inlet 21 is provided at the front end of the drying box 20, and an outlet 22 is provided at the rear end. A front support roller 31 and a rear support roller 32 are also arranged on the frame 30. The front support roller 31 is arranged in front of the drying box 20, and the rear support roller 32 is arranged behind the drying box 20. The front support roller 31 corresponds to the inlet 21 of the drying box 20, and the rear support roller 32 corresponds to the outlet 22 of the drying box 20. The primary membrane 10 enters through the inlet 21 after passing through the front support roller 31, and after drying, it flows out through the outlet 22 and is wound up after passing through the rear support roller 32.

[0040] A hot air circulation system 40 is arranged on the drying box 20. The hot air circulation system 40 includes an air inlet channel 41, an air outlet channel 42, and a blower 43. One end of the air inlet channel 41 is communicated with the inside of the drying box 20, and the other end is communicated with the air outlet of the blower 43. One end of the air outlet channel 42 is communicated with the inside of the drying box 20, and the other end is communicated with the air inlet of the blower 43. An electric heating heating wire is arranged in the air inlet channel 41. The position where the air inlet channel 41 is communicated with the drying box 20 is above the drying box 20, and the position where the air outlet channel 42 is communicated with the drying box 20 is below. The electric heating heating wire heats the air passing through it so that the air temperature is maintained between 40 degrees and 50 degrees, thereby realizing the preheating of the primary membrane 10.

[0041] A drying mechanism 50 is also arranged inside the drying box 20. A mounting frame 51 is slidably arranged inside the drying box 20. The drying mechanism 50 includes multiple groups of drying components arranged on the mounting frame 51. In this embodiment, two groups of drying components are arranged, and the two groups of drying components are arranged one in front of the other inside the drying box 20.

[0042] The drying component includes two hot oil internal heating plates 521 symmetrically arranged above and below the primary membrane 10. An electric heating heat transfer oil furnace 522 is arranged on the drying box 20. The electric heating heat transfer oil furnace 522 and the hot oil internal heating plates 521 are connected through an oil pipe to form a circuit, and a high-temperature oil pump 523 is arranged on the oil pipe. The temperature of the hot oil internal heating plates 521 is heated to between 50 degrees and 60 degrees by the electric heating heat transfer oil furnace 522.

[0043] The width of the hot oil internal heating plate 521 located in the front is one unit length. In the present embodiment, one unit length is 1 meter. The width of the hot oil internal heating plate 521 located in the rear is 1.2 meters. The distance between the front and rear hot oil internal heating plates 521 is 1.9 meters.

[0044] The drying mechanism 50 further includes a driving assembly, two of which are symmetrically arranged about the mounting frame 51. The driving assembly is used to drive the mounting frame 51 to reciprocate in the drying box 20. In this embodiment, the unidirectional movement distance of the mounting frame 51 is 1 meter. The driving assembly includes a driving gear 60, a forward driven gear 61 and a reverse driven gear 62 meshing with the driving gear 60, the forward driven gear 61 and the reverse driven gear 62 are symmetrically arranged about the driving gear 60, the forward driven gear 61 is coaxially provided with a forward driving non-full tooth 63, the reverse driven gear 62 is coaxially provided with a reverse driving non-full tooth 64, a driven double-sided rack 65 is arranged between the forward driving non-full tooth 63 and the reverse driving non-full tooth 64, when the forward driving non-full tooth 63 is meshed with the driven double-sided rack 65, the reverse driving non-full tooth 64 is not meshed with the driven double-sided rack 65, and when the reverse driving non-full tooth 64 is meshed with the driven double-sided rack 65, the forward driving non-full tooth 63 is not meshed with the driven double-sided rack 65. It is meshed with the driven double-sided rack 65, and the driven double-sided rack 65 is fixedly connected to the mounting frame 51. A first linear bearing 66 is arranged on the side of the driven double-sided rack 65, and a first slide rail 67 adapted to the first linear bearing 66 is arranged on the inner wall of the drying box 20. The rotating shaft of the driving gear 60 and the front support roller 31 are transmitted through a sprocket chain assembly (not shown in the figure). The moving speed of the drying assembly is the same as the moving speed of the primary film 10. The driving gear 60, the forward driven gear 61 and the reverse driven gear 62 are all rotatably set on the side wall of the mounting box. Under the drive of the driving gear 60, the forward driven gear 61 and the reverse driven gear 62, the unidirectional moving distance of the driven double-sided rack 65 is 1 meter.

[0045] A second slide rail 71 is vertically arranged on the mounting frame 51, a connecting frame 72 is arranged at the end of the hot oil internal heating type heating plate 521, and a second linear bearing 73 sliding along the second slide rail 71 is arranged on the connecting frame 72. A clamping state switching component 80 is arranged between the connecting frame 72 and the drying box 20. The clamping state switching component 80 is used to drive the two hot oil internal heating type heating plates 521 to move, so that when the moving direction of the drying component is the same as the moving direction of the primary film 10, the two hot oil internal heating type heating plates 521 of the drying component clamp the primary film 10, and when the moving direction of the drying component is opposite to the moving direction of the primary film 10, the two hot oil internal heating type heating plates 521 of the drying component do not clamp the primary film 10.

[0046] The clamping state switching component 80 includes an elastic driving column 81 fixedly arranged on the connecting frame 72 and an orbital plate 82 fixed on the side wall of the drying oven 20. The elastic driving column 81 consists of a connecting shaft 811 and a cap 812 sleeved on the connecting shaft 811. A spring 813 is arranged inside the cap 812. A track groove corresponding to the elastic driving column 81 is formed on the orbital plate 82. The track groove is divided into a first sliding groove 83 and a second sliding groove 84. The linear lengths of both the first sliding groove 83 and the second sliding groove 84 are 1 meter. The first sliding groove 83 and the second sliding groove 84 form a parallelogram groove that is connected end to end. The first sliding groove 83 and the second sliding groove 84 are centrosymmetric about the center of the orbital plate 82. The groove depth at the end of the first sliding groove 83 is less than the groove depth at the beginning of the second sliding groove 84, and the groove depth at the end of the second sliding groove 84 is less than the groove depth at the beginning of the first sliding groove 83. It should be noted that each hot oil internal heating plate 521 corresponds to a clamping state switching component 80.

[0047] When the primary film 10 that has been heated and dried by the upper and lower hot oil internal heating plates 521 flows out, indentations will appear at the edges of the hot oil internal heating plates 521. Therefore, a shaping component 90 is arranged behind a set of drying components at the rear. The shaping component 90 is used to shape the dried primary film 10. The shaping component 90 includes a set of symmetrically arranged upper and lower shaping rollers 91. The shaping rollers 91 are rotatably arranged on the mounting frame 51. A driving shaft 511 is rotatably arranged on the mounting frame 51. The driving shaft 511 and the shaping rollers 91 are connected by a connecting arm 92. A rotating gear 93 is coaxially arranged on the driving shaft 511. A driving rack is arranged on the connecting frame 72. The driving rack meshes with the rotating gear 93. When the hot oil internal heating plates 521 do not clamp the primary film 10, the upper and lower shaping rollers 91 are in a state of clamping the primary film 10. When the hot oil internal heating plates 521 clamp the primary film 10, the shaping rollers 91 are in a state of being away from the primary film 10. When the hot oil internal heating plates 521 move up / down, under the action of the rotating gear 93 and the driving rack, the shaping rollers 91 rotate towards / away from the primary film 10.

[0048] The working principle of drying the primary film 10 entering the drying oven 20 is as follows: After the primary film 10 enters the interior of the drying oven 20 from the inlet 21 of the drying oven 20, it is preheated and dried by the hot air circulation system 40, and then is subjected to clamping and contact drying by the hot oil internal heating plates 521.

[0049] When the mounting frame 51 is located at the foremost position and moves backward, the two hot oil internal heating plates 521 in the same group clamp the primary film 10, and the clamping range is 1 meter. Then, under the action of the driving assembly, it moves backward by 1 meter. During this process, under the action of the sprocket chain assembly, the driving gear 60 rotates clockwise to drive the forward driven gear 61 and the reverse driven gear 62 to rotate counterclockwise. Among them, the forward driving non-full tooth 63 meshes with the driven double-sided rack 65. Therefore, the forward driving non-full tooth 63 drives the driven double-sided rack 65 and the mounting frame 51 to move backward. During the above process, the elastic driving column 81 moves from the head end of the first chute 83 to the head end of the second chute 84. When the elastic driving column 81 moves to the head end of the second chute 84, the two hot oil internal heating plates 521 no longer clamp the primary film 10. At the same time, under the action of the rotating gear 93 and the driving rack, the upper and lower shaping rollers 91 clamp the primary film 10 and roll and rotate along with the movement of the primary film 10.

[0050] Subsequently, the driving gear 60 continues to rotate clockwise. At this time, the reverse driving non-full tooth 64 meshes with the driven double-sided rack 65, causing the driven double-sided rack 65 and the mounting frame 51 to move in the reverse direction until they return to the initial position of the forward movement. During this process, the elastic driving column 81 moves from the head end of the second chute 84 to the head end of the first chute 83. And under the action of the elastic driving column 81, the two hot oil internal heating plates 521 clamp the primary film 10 again. Subsequently, the above working process is continued to complete the contact heating and drying of all the primary films 10. The dried primary film 10 flows out from the outlet 22, passes through the rear support roller 32, and then is wound up.

[0051] As described above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art of this technology, within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, make equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A polyvinylidene fluoride primary membrane drying device, characterized in that The invention comprises a drying box (20) arranged on a frame (30) and a drying mechanism (50) arranged inside the drying box (20), a mounting frame (51) being slidably arranged inside the drying box (20), the drying mechanism (50) comprising a plurality of drying components arranged on the mounting frame (51), the drying components comprising two hot oil internal heating heating plates (521) symmetrically arranged up and down with respect to the primary film (10), the drying components reciprocatingly moving inside the drying box (20), when the moving direction of the drying components is the same as the moving direction of the primary film (10), the moving speed of the drying components is the same as the moving speed of the primary film (10), the two hot oil internal heating heating plates (521) of the drying components clamp the primary film (10), when the moving direction of the drying components is the same as the moving direction of the primary film (10), the drying components are moved back and forth, and the drying components are moved back and forth with respect to the primary film (10). ) when the moving directions are opposite, the two hot oil internal heating plates (521) of the drying assembly do not clamp the nascent film (10), and the frame (30) is also provided with a front support roller (31) and a rear support roller (32), the front support roller (31) is arranged in front of the drying box (20), and the rear support roller (32) is arranged behind the drying box (20), and a driving motor is arranged on the frame (30), and the driving motor and the front support roller (31) are driven by a sprocket chain assembly, and the front end of the drying box (20) is provided with an inlet (21) and the rear end is provided with an outlet (22), and the nascent film (10) enters through the inlet (21) after passing through the front support roller (31), and flows out through the outlet (22) after drying is completed and is rolled up after passing through the rear support roller (32).

2. The polyvinylidene fluoride nascent membrane drying device according to claim 1, characterized in that: The drying box (20) is also provided with a hot air circulation system (40), which comprises an air inlet channel (41), an air outlet channel (42) and a blower (43); one end of the air inlet channel (41) is connected to the interior of the drying box (20), and the other end is connected to the air outlet of the blower (43); one end of the air outlet channel (42) is connected to the interior of the drying box (20), and the other end is connected to the air inlet of the blower (43); an electric heating wire is provided in the air inlet channel (41).

3. The polyvinylidene fluoride primary membrane drying device according to claim 1, wherein: The drying mechanism (50) further comprises a driving assembly, the driving assembly being used to drive the mounting frame (51) to reciprocate in the drying box (20), the driving assembly comprising a driving gear (60), a forward driven gear (61) and a reverse driven gear (62) meshing with the driving gear (60), the forward driven gear (61) and the reverse driven gear (62) being symmetrically arranged with respect to the driving gear (60), the forward driven gear (61) being coaxially provided with a forward driving non-full tooth (63), the reverse driven gear (62) being coaxially provided with a reverse driving non-full tooth (64), and a driven double-sided rack (65) being arranged between the forward driving non-full tooth (63) and the reverse driving non-full tooth (64). When the forward driving non-full teeth (63) are meshed with the driven double-sided rack (65), the reverse driving non-full teeth (64) are not meshed with the driven double-sided rack (65); when the reverse driving non-full teeth (64) are meshed with the driven double-sided rack (65), the forward driving non-full teeth (63) are not meshed with the driven double-sided rack (65); the driven double-sided rack (65) is fixedly connected to the mounting frame (51); a first linear bearing (66) is provided on the side of the driven double-sided rack (65); a first slide rail (67) adapted to the first linear bearing (66) is provided on the inner wall of the drying box (20); and a sprocket chain assembly is used to transmit the rotation axis of the driving gear (60) and the front support roller (31).

4. The polyvinylidene fluoride primary film drying device according to claim 1, wherein: A second slide rail (71) is vertically arranged on the mounting frame (51); a connecting frame (72) is arranged at the end of the hot oil internal heating type heating plate (521); a second linear bearing (73) sliding along the second slide rail (71) is arranged on the connecting frame (72); a clamping state switching component (80) is arranged between the connecting frame (72) and the drying box (20); the clamping state switching component (80) is used to drive the two hot oil internal heating type heating plates (521) to move.

5. The polyvinylidene fluoride primary membrane drying device according to claim 4, wherein: The clamping state switching component (80) comprises an elastic driving column (81) fixedly arranged on the connecting frame (72) and a track plate (82) fixedly arranged on the side wall of the drying box (20); the track plate (82) is provided with a track groove corresponding to the elastic driving column (81); the track groove is divided into a first slide groove (83) and a second slide groove (84); the first slide groove (83) and the second slide groove (84) form a parallelogram groove connected end to end; the first slide groove (83) and the second slide groove (84) are symmetrical about the center of the track plate (82); the groove depth of the end of the first slide groove (83) is less than the groove depth of the head end of the second slide groove (84); and the groove depth of the end of the second slide groove (84) is less than the groove depth of the head end of the first slide groove (83).

6. The polyvinylidene fluoride primary membrane drying device according to claim 1, characterized in that: Two groups of drying components are arranged in the drying box (20), and the two groups of drying components are arranged one in front of the other. The width of the hot oil internal heating type heating plate (521) of the drying components is one unit length, and the distance between the two groups of drying components is two unit lengths.

7. The polyvinylidene fluoride primary membrane drying device according to claim 6, characterized in that: The width of the hot oil internal heating plate (521) of a group of the drying components located at the rear is greater than one unit length.

8. The polyvinylidene fluoride primary film drying device according to claim 6, wherein: A shaping component (90) is arranged behind a set of the drying components at the rear. The shaping component (90) is used for shaping the dried primary film (10). The shaping component (90) includes a set of symmetrically arranged upper and lower shaping rollers (91). The shaping rollers (91) are rotatably arranged on the mounting frame (51). A driving shaft (511) is rotatably arranged on the mounting frame (51). The driving shaft (511) is connected to the shaping roller (91) through a connecting arm (92). A rotating gear (93) is coaxially arranged on the driving shaft (511). A driving rack is arranged on the hot oil internal heating plate (521). The driving rack meshes with the rotating gear (93). When the hot oil internal heating plate (521) does not clamp the primary film (10), the upper and lower shaping rollers (91) are in a state of clamping the primary film (10). When the hot oil internal heating plate (521) clamps the primary film (10), the shaping roller (91) is in a state of being away from the primary film (10).

9. The polyvinylidene fluoride nascent membrane drying device according to claim 1, wherein: An electric heating heat-conducting oil furnace (522) is arranged on the drying box (20). The electric heating heat-conducting oil furnace (522) is communicated with the hot oil internal heating plate (521) through an oil pipe to form a loop. A high-temperature oil pump (523) is arranged on the oil pipe.

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