PVB (polyvinyl butyral) wedge-shaped film surface water removal device

The PVB wedge-shaped membrane surface dewatering device utilizes a sponge cylinder and a negative pressure system to achieve efficient dewatering of PVB products, solving the problem of poor dewatering effect of traditional dewatering devices on frosted or patterned products, reducing costs and improving production efficiency.

CN121576769APending Publication Date: 2026-02-27YANCHENG KINGWELL INTELLIGENT EQUIP CO LTD
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Patent Information

Application Number
CN202511935321.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-22
Publication Date
2026-02-27

AI Technical Summary

Technical Problem

Traditional positive pressure air knife dewatering devices are ineffective at removing water from abrasive or patterned products and are costly, making it difficult to meet the needs of high-volume production.

Method used

A PVB wedge membrane surface dewatering device is adopted, including a fixing frame, a water absorption component, a collection component, and an adjustment component. It uses a sponge cylinder and a negative pressure system to achieve efficient water removal. Water is absorbed by the sponge cylinder and discharged by the negative pressure machine. The tension and contact area are adjusted by an electric push rod.

Benefits of technology

It achieves efficient water removal from PVB products, reduces costs, and improves production efficiency without requiring downtime.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of PVB product water removal, and discloses a PVB wedge-shaped film surface water removal device which is characterized in that two rotating shafts are rotationally connected to the inner side of a fixing frame, two fixing rollers are fixedly connected to the outer sides of the two rotating shafts in a sleeving mode correspondingly, and two sleeves are fixedly connected to the outer sides of the two rotating shafts in a sleeving mode correspondingly and located on the outer sides of the fixing rollers; a plurality of drainage holes are formed in the outer sides of the two sleeves, the outer sides of the two sleeves are sleeved with sponge barrels, the two ends of the outer sides of the two rotating shafts are movably sleeved with sealing covers correspondingly, one sides of the two sealing covers are movably sleeved with the outer sides of the sponge barrels correspondingly, and drainage assemblies are arranged at one ends of the rotating shafts; a PVB product enters the inner side of a sponge barrel through a rotating roller on the outer side of a fixing shaft, one side of the PVB product abuts against the outer side of the sponge barrel and penetrates through the position between auxiliary rollers on two connecting shafts, the other side of the PVB product abuts against the outer side of the other sponge barrel, water can be removed from the two sides of the PVB product through three water absorption assemblies, and the water absorption efficiency of the PVB product is improved. And moreover, the water removal effect of the PVB product is ensured, and the cost is relatively low.
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Description

Technical Field

[0001] This invention relates to the field of PVB product dewatering technology, specifically a PVB wedge membrane surface dewatering device. Background Technology

[0002] Currently, sheet cooling and shaping primarily utilizes roller cooling. However, since the size and number of rollers cannot be increased indefinitely, sheet cooling and shaping has become a bottleneck for increasing production capacity as production lines achieve higher output. Roller cooling is an indirect method with low efficiency. For high-volume production, some products can be directly immersed in water for cooling, or cooled on the roller surface, controlled for thickness, and then immersed in water for comprehensive cooling. This method offers faster and more efficient cooling. After the products exit the water, surface moisture needs to be completely removed. Traditionally, multiple sets of positive pressure air knives are used for dehydration. However, this method is less effective for products with frosted or patterned surfaces, and good air knives are expensive, leading to higher costs. Therefore, a PVB wedge-shaped film surface dehydration device is proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a PVB wedge membrane surface dewatering device to solve the problems mentioned in the background art, which are that traditional methods of dewatering with multiple sets of positive pressure air knives are used, but the effect is relatively poor when dewatering products with frosted or patterned surfaces, and good air knives are expensive and costly.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a PVB wedge-shaped membrane surface dewatering device, comprising... A fixed frame, the inner side of which is provided with three sets of water absorption components, the side of which is provided with a collection component, and the fixed frame is equipped with an adjustment component; The water-absorbing assembly includes two rotating shafts, two fixed rollers, and two sleeves. The two rotating shafts are rotatably connected to the inner side of the fixed frame. The two fixed rollers are respectively fixedly sleeved on the outer side of the two rotating shafts. The two sleeves are respectively fixedly sleeved on the outer side of the two rotating shafts and located outside the fixed rollers. Several drainage holes are opened on the outer side of the two sleeves. A sponge tube is sleeved on the outer side of the two sleeves. Both ends of the outer side of the two rotating shafts are movably sleeved with caps. One side of each cap is movably sleeved on the outer side of the sponge tube. A drainage assembly is provided at one end of the rotating shaft.

[0005] Preferably, the drainage assembly includes four fixed pipes, a rotating base, and a connector. One end of the rotating shaft has a guide hole. The four fixed pipes are fixedly connected to the outside of the rotating shaft and located inside the sleeve. One end of the rotating shaft is fixedly connected to the rotating base, and the connector is installed on the rotating base.

[0006] Preferably, all four fixing tubes are connected to one end of the guide hole, and the connector is connected to the other end of the guide hole.

[0007] Preferably, the adjustment assembly includes three fixed shafts, three rotating rollers, and three fixed frames. Three sliding grooves are formed on the top of both sides of the fixed frame. The three fixed shafts pass through the interior of the three sliding grooves. The three rotating rollers are fixedly sleeved on the outside of the three fixed shafts. The three fixed frames are fixedly connected to both sides of the fixed frame. A slide rail is fixedly connected to the inner side of each of the three fixed frames. A slider is slidably connected to the inner side of each slide rail. The fixed shafts are rotatably connected to the interior of the slider. An electric push rod is fixedly connected to one end of each of the three fixed frames. The push rod end of the electric push rod passes through the interior of the fixed frame and is fixedly connected to one side of the slider.

[0008] Preferably, the collection assembly includes a collection bucket, a float level switch, and a water inlet pipe. The collection bucket is disposed on one side of the fixing frame, the float level switch is installed inside the collection bucket, the water inlet pipe is connected to the outside of the collection bucket, a fixing ring is fixedly sleeved on the outside of the collection bucket, a cover is installed on the top of the collection bucket, a filter plate is installed inside the cover, a connecting pipe is connected to the top of the cover, a negative pressure machine is installed at one end of the connecting pipe, and the water inlet pipe is connected to the outside of the collection bucket.

[0009] Preferably, a fixing base is fixedly connected to the outer side of the fixing ring, and an alarm is installed on the top of the fixing base. The electrical output terminal of the float level switch is connected to the electrical input terminal of the alarm.

[0010] Preferably, the water inlet pipe is connected to one end of the connector via a pipe, and a drain pipe is connected to the outside of the collection bucket, with a sealing cap installed on the drain pipe.

[0011] Preferably, the inner side of the fixing frame is rotatably connected to a connecting shaft between the upper and lower sponge cylinders, and an auxiliary roller is fixedly sleeved on the outer side of the connecting shaft.

[0012] Preferably, a gear is fixedly sleeved on the other end of the two rotating shafts in a set, and three mounting brackets are fixedly connected to the outside of the fixing frame. A drive motor is mounted on the mounting bracket, and the output shaft of the drive motor is fixedly connected to the other end of the rotating shaft. The upper and lower gears are connected by a chain.

[0013] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects: This invention allows PVB products to enter the inner side of a sponge tube via an outer roller on a fixed shaft. One side of the PVB product abuts against the outer side of the sponge tube and passes between auxiliary rollers on two connecting shafts, so that the other side of the PVB product abuts against the outer side of another sponge tube. Through three sets of water-absorbing components, water can be removed from both sides of the PVB product, ensuring the water removal effect of the PVB product. Moreover, it has a lower cost and is easier to popularize and use.

[0014] When the sponge tube is saturated with water, under negative pressure, the water enters between the fixed roller and the sleeve through the drain hole. Then, the water is collected through the fixed pipe and enters the guide hole through the fixed pipe. Then, it enters the collection bucket through the pipe on the connector head. This can drain the water inside the sponge tube, ensuring the water removal effect of the sponge tube. Moreover, it does not require machine shutdown, thus ensuring the water removal efficiency of PVB products.

[0015] The present invention uses the push rod of the electric push rod 37 to drive the slider 36 to move, so that the two sliders 36 drive the fixed shaft 32 to move. The fixed shaft 32 can drive the rotating roller 33 to move, thereby adjusting the tension of the PVB product, so that the PVB product is tightly attached to the outside of the sponge tube 25, and can also adjust the contact area between the PVB product and the sponge tube 25 to ensure the water removal effect of the sponge tube 25. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the left-side structure of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the collection bucket of the present invention; Figure 4 This is a schematic diagram of the fixing ring structure of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the sponge cylinder of the present invention; Figure 6 This is a schematic diagram of the right-side structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram of area A in the middle; Figure 8 This is a schematic cross-sectional view of the fixing frame structure of the present invention.

[0018] Explanation of reference numerals in the attached drawings: 1. Fixed frame; 21. Rotating shaft; 22. Fixed roller; 23. Sleeve; 24. Drain hole; 25. Sponge tube; 26. Cover; 27. Guide hole; 28. Fixed pipe; 29. ​​Rotary seat; 210. Connector; 31. Slide groove; 32. Fixed shaft; 33. Rotating roller; 34. Fixed frame; 35. Slide rail; 36. Slider; 37. Electric push rod; 41. Collection tank; 42. Float level switch; 43. Water inlet pipe; 44. Fixed ring; 45. Cover; 46. Filter plate; 47. Connecting pipe; 48. Negative pressure unit; 49. Drain pipe; 410. Fixed seat; 411. Alarm; 5. Connecting shaft; 6. Auxiliary roller; 7. Gear; 8. Mounting frame; 9. Drive motor. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce. Example 1

[0021] Please see Figure 1-5 The present invention provides a technical solution: a PVB wedge membrane surface water removal device, including a fixing frame 1, three sets of water absorption components are arranged on the inner side of the fixing frame 1, a collection component is arranged on one side of the fixing frame 1, and an adjustment component is installed on the fixing frame 1.

[0022] By setting up a water-absorbing assembly, water can be removed from the surface of PVB products. The water-absorbing assembly includes two rotating shafts 21, two fixed rollers 22, and two sleeves 23. The two rotating shafts 21 are rotatably connected to the inner side of the fixed frame 1. The two fixed rollers 22 are respectively fixedly sleeved on the outer side of the two rotating shafts 21. The two sleeves 23 are respectively fixedly sleeved on the outer side of the two rotating shafts 21 and located on the outer side of the fixed rollers 22. Several drainage holes 24 are opened on the outer side of the two sleeves 23. Sponge tubes 25 are sleeved on the outer side of the two sleeves 23. Both ends of the outer side of the two rotating shafts 21 are movably sleeved with caps 26. One end of each cap 26... The two sides are respectively movably sleeved on the outside of the sponge tube 25. The inner side of the fixing frame 1 is rotatably connected to the connecting shaft 5 between the upper and lower sponge tubes 25. The outer side of the connecting shaft 5 is fixedly sleeved with the auxiliary roller 6. The PVB product enters the inner side of the sponge tube 25 through the outer rotating roller 33 of the fixing shaft 32. One side of the PVB product abuts against the outer side of the sponge tube 25 and passes between the auxiliary rollers 6 on the two connecting shafts 5, so that the other side of the PVB product abuts against the outer side of the other sponge tube 25. Through the three sets of water absorption components, water can be removed from both sides of the PVB product, and the water removal effect of the PVB product can be guaranteed. A drainage component is provided at one end of the rotating shaft 21.

[0023] By setting up a drainage assembly, water inside the sponge cylinder 25 can be drained. The drainage assembly includes four fixed pipes 28, a rotating seat 29, and a connector 210. One end of the rotating shaft 21 has a guide hole 27. The four fixed pipes 28 are fixedly connected to the outside of the rotating shaft 21 and located inside the sleeve 23. One end of the rotating shaft 21 is fixedly connected to the rotating seat 29, and the connector 210 is installed on the rotating seat 29. All four fixed pipes 28 are connected to one end of the guide hole 27, and the connector 210 is connected to the other end of the guide hole 27. Under the action of negative pressure, the water inside the sponge cylinder 25 enters between the fixed roller 22 and the sleeve 23 through the drain hole 24, and then the water is collected through the fixed pipes 28. The collected water then enters the interior of the guide hole 27 through the fixed pipes 28, and then the water inside the sponge cylinder 25 can be drained through the pipe on the connector 210.

[0024] By setting up a collection component, water can be collected without stopping the machine, ensuring the dewatering efficiency of PVB products. The collection component includes a collection tank 41, a float level switch 42, and a water inlet pipe 43. The collection tank 41 is set on one side of the fixed frame 1. The float level switch 42 is installed inside the collection tank 41. The water inlet pipe 43 is connected to the outside of the collection tank 41. A fixing ring 44 is fixedly sleeved on the outside of the collection tank 41. A cover 45 is installed on the top of the collection tank 41. A filter plate 46 is installed inside the cover 45. A connecting pipe 47 is connected to the top of the cover 45. A negative pressure machine 48 is installed at one end of the connecting pipe 47. The water inlet pipe 43 is connected to the outside of the collection tank 41. The negative pressure machine 48 extracts the gas inside the collection tank 41. The water inlet pipe 43 on the collection tank 41 is connected to the connector 210 through a pipe. Under the action of negative pressure, the water inside the sponge cylinder 25 enters between the fixed roller 22 and the sleeve 23 through the drain hole 24, and then is collected through the fixed pipe 28.

[0025] To facilitate cleaning of the collection tank 41, a fixing base 410 is fixedly connected to the outside of the fixing ring 44. An alarm 411 is installed on the top of the fixing base 410. The electrical output terminal of the float level switch 42 is connected to the electrical input terminal of the alarm 411. When there is too much water inside the collection tank 41, the float level switch 42 controls the alarm 411 to start, reminding personnel that the inside of the collection tank 41 needs to be cleaned. The water inlet pipe 43 is connected to one end of the connector 210 through a pipe. A drain pipe 49 is connected to the outside of the collection tank 41, and a sealing cap is installed on the drain pipe 49. During cleaning, the collected water can be drained by opening the sealing cap on the drain pipe 49. The operation is simple and quick.

[0026] A set of two rotating shafts 21 are fixedly fitted with gears 7 at the other end. Three mounting brackets 8 are fixedly connected to the outside of the fixed frame 1. A drive motor 9 is mounted on the mounting bracket 8. The output shaft of the drive motor 9 is fixedly connected to the other end of the rotating shaft 21. The upper and lower gears 7 are connected by a chain. The output shaft of the drive motor 9 drives one rotating shaft 21 to rotate, and one rotating shaft 21 drives one gear 7 to rotate. One gear 7 drives another gear 7 to rotate through the chain, and drives another rotating shaft 21 to rotate, which can transport PVB products.

[0027] The working principle or structural principle is as follows: When removing water from the surface of PVB products, the PVB products enter the inner side of the sponge cylinder 25 through the outer roller 33 of the fixed shaft 32. One side of the PVB products abuts against the outer side of the sponge cylinder 25 and passes between the auxiliary rollers 6 on the two connecting shafts 5, so that the other side of the PVB products abuts against the outer side of another sponge cylinder 25. During water removal, the drive motor 9 is started by controlling the switch group. The output shaft of the drive motor 9 drives a rotating shaft 21 to rotate. The rotating shaft 21 drives a gear 7 to rotate. The gear 7 drives another gear 7 to rotate through the chain, and drives another rotating shaft 21 to rotate. This can transport the PVB products. Through the three sets of water absorption components, water can be removed from both sides of the PVB products, and the water removal effect of the PVB products can be guaranteed. When the sponge cylinder 25 is saturated with water, the negative pressure machine 48 is started by controlling the switch group. The negative pressure machine 48 extracts the gas inside the collection tank 41. The water inlet pipe 43 on the collection tank 41 is connected to the connector 210 through the pipe. Under the action of negative pressure, the water inside the sponge cylinder 25 enters between the fixed roller 22 and the sleeve 23 through the drain hole 24, and then is collected through the fixed pipe 28. The collected water then enters the guide hole 27 through the fixed pipe 28, and then enters the collection tank 41 through the pipe on the connector 210. This can drain the water inside the sponge cylinder 25, ensuring the water removal effect of the sponge cylinder 25, and without stopping the machine, ensuring the water removal efficiency of PVB products. When there is too much water in the collection tank 41, the float level switch 42 controls the alarm 411 to start. The alarm 411 reminds personnel that the inside of the collection tank 41 needs to be cleaned. During cleaning, the collected water can be drained by opening the sealing cap on the drain pipe 49. The operation is simple and quick. Example 2

[0028] Please see Figure 6-8Unlike Embodiment 1, the adjustment assembly includes three fixed shafts 32, three rotating rollers 33, and three fixed frames 34. Three sliding grooves 31 are provided on the top of both sides of the fixed frame 1. The three fixed shafts 32 pass through the interior of the three sliding grooves 31. The three rotating rollers 33 are fixedly sleeved on the outside of the three fixed shafts 32. The three fixed frames 34 are fixedly connected to both sides of the fixed frame 1. A slide rail 35 is fixedly connected to the inner side of the three fixed frames 34. A slider 36 is slidably connected to the inner side of the slide rail 35. The fixed shafts 32 are rotatably connected to the slider 36. Inside, one end of each of the three fixed frames 34 is fixedly connected to an electric push rod 37. The push rod end of the electric push rod 37 passes through the inside of the fixed frame 34 and is fixedly connected to one side of the slider 36. The push rod of the electric push rod 37 drives the slider 36 to move, which in turn drives the fixed shaft 32 to move. The fixed shaft 32 can drive the rotating roller 33 to move, thereby adjusting the tension of the PVB product, so that the PVB product is tightly attached to the outside of the sponge cylinder 25, and the contact area between the PVB product and the sponge cylinder 25 can be adjusted to ensure the water removal effect of the sponge cylinder 25.

[0029] The working principle or structural principle is as follows: During the dewatering process of PVB products, the extension of the electric push rod 37 is controlled by the switch group. The push rod of the electric push rod 37 drives the slider 36 to move outside the slide rail 35, so that the two sliders 36 simultaneously drive the fixed shaft 32 to move. The fixed shaft 32 can drive the rotating roller 33 to move, thereby adjusting the tension of the PVB products, so that the PVB products are tightly attached to the outside of the sponge cylinder 25, and the contact area between the PVB products and the sponge cylinder 25 can be adjusted to ensure the dewatering effect of the sponge cylinder 25.

[0030] Those skilled in the art will understand that the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

Claims

1. A PVB wedge-shaped membrane surface dewatering device, characterized in that, include The fixed frame (1) has three sets of water absorption components on its inner side, a collection component on one side of the fixed frame (1), and an adjustment component installed on the fixed frame (1). The water absorption assembly includes two rotating shafts (21), two fixed rollers (22), and two sleeves (23). The two rotating shafts (21) are rotatably connected to the inner side of the fixed frame (1). The two fixed rollers (22) are respectively fixedly sleeved on the outer side of the two rotating shafts (21). The two sleeves (23) are respectively fixedly sleeved on the outer side of the two rotating shafts (21) and located on the outer side of the fixed rollers (22). Several drainage holes (24) are opened on the outer side of the two sleeves (23). A sponge tube (25) is sleeved on the outer side of the two sleeves (23). Both ends of the outer side of the two rotating shafts (21) are movably sleeved with caps (26). One side of the two caps (26) is movably sleeved on the outer side of the sponge tube (25). A drainage assembly is provided at one end of the rotating shaft (21).

2. The PVB wedge-shaped membrane surface dewatering device according to claim 1, characterized in that, The drainage assembly includes four fixed pipes (28), a rotating seat (29), and a connector (210). One end of the rotating shaft (21) is provided with a guide hole (27). The four fixed pipes (28) are fixedly connected to the outside of the rotating shaft (21) and located inside the sleeve (23). One end of the rotating shaft (21) is fixedly connected to the rotating seat (29), and the connector (210) is installed on the rotating seat (29).

3. The PVB wedge-shaped membrane surface dewatering device according to claim 2, characterized in that, All four fixed tubes (28) are connected to one end of the guide hole (27), and the connector (210) is connected to the other end of the guide hole (27).

4. The PVB wedge-shaped membrane surface dewatering device according to claim 1, characterized in that, The adjustment assembly includes three fixed shafts (32), three rotating rollers (33), and three fixed frames (34). The top of both sides of the fixed frame (1) is provided with three sliding grooves (31). The three fixed shafts (32) pass through the interior of the three sliding grooves (31). The three rotating rollers (33) are fixedly sleeved on the outside of the three fixed shafts (32). The three fixed frames (34) are fixedly connected to both sides of the fixed frame (1). The inner side of the three fixed frames (34) is fixedly connected to a slide rail (35). The inner side of the slide rail (35) is slidably connected to a slider (36). The fixed shafts (32) are rotatably connected to the interior of the slider (36). One end of the three fixed frames (34) is fixedly connected to an electric push rod (37). The push rod end of the electric push rod (37) passes through the interior of the fixed frame (34) and is fixedly connected to one side of the slider (36).

5. The PVB wedge-shaped membrane surface dewatering device according to claim 2, characterized in that, The collection assembly includes a collection bucket (41), a float level switch (42), and an inlet pipe (43). The collection bucket (41) is located on one side of the fixing frame (1). The float level switch (42) is installed inside the collection bucket (41). The inlet pipe (43) is connected to the outside of the collection bucket (41). A fixing ring (44) is fixedly sleeved on the outside of the collection bucket (41). A cover (45) is installed on the top of the collection bucket (41). A filter plate (46) is installed inside the cover (45). A connecting pipe (47) is connected to the top of the cover (45). A negative pressure machine (48) is installed at one end of the connecting pipe (47). The inlet pipe (43) is connected to the outside of the collection bucket (41).

6. The PVB wedge-shaped membrane surface dewatering device according to claim 5, characterized in that, A fixing seat (410) is fixedly connected to the outside of the fixing ring (44), and an alarm (411) is installed on the top of the fixing seat (410). The electrical output terminal of the float level switch (42) is connected to the electrical input terminal of the alarm (411).

7. The PVB wedge-shaped membrane surface dewatering device according to claim 5, characterized in that, The inlet pipe (43) is connected to one end of the connector (210) via a pipe, and the outside of the collection bucket (41) is connected to a drain pipe (49), which is fitted with a sealing cap.

8. The PVB wedge-shaped membrane surface dewatering device according to claim 1, characterized in that, The inner side of the fixing frame (1) is rotatably connected to the upper and lower sponge tubes (25), and the outer side of the connecting shaft (5) is fixedly sleeved with an auxiliary roller (6).

9. The PVB wedge-shaped membrane surface dewatering device according to claim 1, characterized in that, A gear (7) is fixedly sleeved on the other end of a set of two rotating shafts (21). Three mounting brackets (8) are fixedly connected to the outside of the fixing bracket (1). A drive motor (9) is mounted on the mounting bracket (8). The output shaft of the drive motor (9) is fixedly connected to the other end of the rotating shaft (21). The upper and lower gears (7) are connected by a chain.