Efficient adhesive mixing device

By designing a high-efficiency mixing device that includes a mixing tank, a rotating shaft, a stirring plate, and a lifting assembly, the problem of material residue in adhesive production was solved, achieving efficient mixing and cleaning while reducing waste.

CN224194731UActive Publication Date: 2026-05-05ZHEJIANG XINQIU TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-08
Publication Date
2026-05-05

AI Technical Summary

Technical Problem

Existing mixing equipment has the problem of material residue in the adhesive production process, resulting in waste.

Method used

A high-efficiency mixing device was designed, comprising a mixing tank, a rotating shaft, a stirring plate, a circular lifting plate, and a lifting assembly. After mixing by the stirring plate, the adhesive adhering to the inner wall of the mixing tank and the stirring plate is scraped off by the circular lifting plate and discharged.

Benefits of technology

It effectively reduces adhesive waste and improves mixing efficiency and cleaning effect.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of adhesive production, and discloses an efficient adhesive mixing device which comprises a mixing tank, a feeding pipe, a discharging pipe, a rotating shaft, a driving assembly and a stirring plate, a circular lifting plate is vertically arranged in the mixing tank in a sliding mode, a lifting assembly is arranged at the top of the mixing tank, a sliding hole is formed in the middle of the circular lifting plate, and the sliding hole makes contact with the outer wall of the rotating shaft; two strip-shaped holes are symmetrically formed in the circular lifting plate, the two strip-shaped holes communicate with the sliding hole, and a fixing assembly is arranged at the top of the mixing tank. The lifting assembly drives the circular lifting plate to descend, in the descending process of the circular lifting plate, the adhesive attached to the inner wall of the mixing tank is scraped downwards, meanwhile, the multiple stirring plates penetrate through the strip-shaped holes, and the circular lifting plate scrapes the adhesive attached to the stirring plates downwards. And finally, the circular lifting plate reaches the bottom in the mixing tank, the adhesive between the circular lifting plate and the bottom in the mixing tank is extruded into a discharging pipe to be discharged, and waste is reduced.
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Description

Technical Field

[0001] This utility model relates to the field of adhesive production technology, and in particular to an efficient adhesive mixing device. Background Technology

[0002] Adhesives, also known as "bonding agents" or "adhesives," are substances that firmly bond two or more parts or materials together through interfacial adhesion and cohesion (chemical and physical forces). They include epoxy resins, acrylic resins, polyurethanes, and others. Adhesives typically require mixing equipment for blending and stirring during the production process.

[0003] Currently, existing mixing devices in adhesive production primarily rely on stirring plates to mix materials within the mixing tank. However, due to the strong viscous properties of adhesives, significant material residue issues arise in actual production: during the free-flowing discharge of the adhesive under its own weight, some adhesive adheres to the inner wall of the mixing tank and the surface of the stirring plates. This adhesive is then directly washed away during subsequent tank cleaning, resulting in waste. Utility Model Content

[0004] To address the aforementioned problems, this invention provides an efficient adhesive mixing device.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a high-efficiency adhesive mixing device, comprising a mixing tank, an inlet pipe on the mixing tank and an outlet pipe at the bottom, a vertically rotating shaft inside the mixing tank, a driving assembly for driving the rotating shaft to rotate at the top of the mixing tank, several sets of stirring plates vertically spaced on the rotating shaft, each set of stirring plates including two symmetrically arranged stirring plates, a circular lifting plate vertically sliding inside the mixing tank, the diameter of the circular lifting plate being the same as the inner diameter of the mixing tank, a lifting assembly for driving the circular lifting plate to rise and fall at the top of the mixing tank, a sliding hole in the middle of the circular lifting plate, the sliding hole contacting the outer wall of the rotating shaft, two symmetrically arranged strip holes on the circular lifting plate, both strip holes communicating with the sliding hole, and a fixing assembly for fixing the rotating shaft so that the projected surface of the top of the stirring plate is aligned with the strip holes at the top of the mixing tank.

[0006] By adopting the above technical solution, a mixing tank, a rotating shaft, stirring plates, a circular lifting plate, a lifting assembly, and a fixing assembly are set up. The driving assembly drives the rotating shaft to rotate, which in turn drives several sets of stirring plates to rotate, efficiently mixing the adhesive in the mixing tank. After mixing, the rotating shaft is rotated so that the top projection surface of the stirring plate is aligned with the strip hole, and then fixed by the fixing assembly. Subsequently, the lifting assembly drives the circular lifting plate to descend. During the descent of the circular lifting plate, the adhesive adhering to the inner wall of the mixing tank is scraped downwards. At the same time, several stirring plates pass through the strip hole, and the circular lifting plate scrapes the adhesive adhering to the stirring plates downwards. Finally, the circular lifting plate reaches the bottom of the mixing tank, squeezing the adhesive between the circular lifting plate and the bottom of the mixing tank into the discharge pipe for discharge, reducing waste.

[0007] Furthermore, the fixing assembly includes a mounting base disposed on the top of the mixing tank. The upper end of the rotating shaft passes through the mounting base and has two connecting plates symmetrically arranged thereon. The length direction of the connecting plates is consistent with the length direction of the stirring plate. An L-shaped seat is provided on the mounting base. The lower end of the vertical section of the L-shaped seat is connected to the mounting base, and a threaded hole is vertically opened on the horizontal section. A first threaded rod is spirally arranged in the threaded hole. A handle is provided at the upper end of the first threaded rod. A fixing hole is opened on the connecting plate. When the lower end of the first threaded rod is located in the fixing hole, the position of the connecting plate is fixed.

[0008] By adopting the above technical solution, a mounting base, a connecting plate, and a first threaded rod are set. The rotating shaft is rotated so that the fixing hole on one of the connecting plates is concentric with the threaded hole. Then, the handle is rotated to drive the first threaded rod to rotate. When the first threaded rod rotates, it rises and falls relative to the L-shaped seat. When the lower end of the first threaded rod is located in the fixing hole, the position of the connecting plate is fixed, thereby fixing the position of the rotating shaft and the stirring plate.

[0009] Furthermore, the top of the mixing tank has two symmetrically arranged guide holes. The lifting assembly includes guide rods that are vertically slidably disposed in the guide holes. The lower ends of the two guide rods are connected to a circular lifting plate, and the upper ends are jointly provided with a connecting ring. The connecting ring is vertically provided with two second threaded rods. The top of the mixing tank has a through hole corresponding to the second threaded rod. The lower end of the second threaded rod passes through the through hole and is connected to the circular lifting plate. The top of the mixing tank is rotatably provided with a nut seat corresponding to the second threaded rod. The nut seat is helically connected to the second threaded rod. A sprocket is sleeved on the nut seat, and the two sprockets are connected by a chain.

[0010] By adopting the above technical solution, a guide rod, a connecting ring, a second threaded rod, a nut seat, and a second threaded rod are set up. The sprocket and chain ensure that the two nut seats rotate synchronously, thereby driving the two second threaded rods to rise and fall synchronously, which in turn drives the circular lifting plate to rise and fall.

[0011] Furthermore, a driven wheel is fixedly sleeved on one of the second threaded rods, and a power motor is vertically arranged on the outer wall of the mixing tank. The output axis of the power motor is axially upward and a driving wheel is arranged thereon, and the driving wheel meshes with the driven wheel.

[0012] By adopting the above technical solution, a driven wheel, a power motor, and a driving wheel are set up. The power motor drives the driving wheel to rotate, which in turn drives the driven wheel to rotate, thereby driving the second threaded rod connected to it to rotate.

[0013] Furthermore, two fixing strips are symmetrically arranged at the bottom of the mixing tank. The top surface shape of the fixing strip is the same as the bottom surface shape of the stirring plate, and the length direction of the fixing strip is the same as the length direction of the stirring plate.

[0014] By adopting the above technical solution and setting a fixing strip, when the circular lifting plate descends to near the bottom of the mixing tank, the protrusion gets stuck in the strip hole and closes the strip hole, ensuring that when the circular lifting plate squeezes the adhesive at the bottom of the mixing tank, the adhesive will not pass through the strip hole.

[0015] Furthermore, the drive assembly includes a fixed base disposed on the top of the mixing tank, on which a drive motor is vertically disposed, the output axis of the drive motor being downward and connected to the upper end of the rotating shaft.

[0016] By adopting the above technical solution, a fixed base and a drive motor are set up, and the drive motor drives the rotating shaft to rotate.

[0017] Furthermore, the mixing tank is equipped with a water inlet pipe, which is connected to an external water source, and a control solenoid valve is installed on the water inlet pipe.

[0018] By adopting the above technical solution, an inlet pipe is installed and a solenoid valve is controlled. The inlet pipe introduces water into the mixing tank to clean the inside of the mixing tank.

[0019] In summary, this utility model has the following beneficial effects: This application includes a mixing tank, a rotating shaft, stirring plates, a circular lifting plate, a lifting assembly, and a fixing assembly. The driving assembly drives the rotating shaft to rotate, which in turn drives several sets of stirring plates to rotate, efficiently mixing the adhesive in the mixing tank. After mixing, the rotating shaft is rotated so that the top projection surface of the stirring plate aligns with the strip-shaped hole, and then fixed by the fixing assembly. Subsequently, the lifting assembly drives the circular lifting plate to descend. During the descent of the circular lifting plate, the adhesive adhering to the inner wall of the mixing tank is scraped downwards. Simultaneously, several stirring plates pass through the strip-shaped hole, and the circular lifting plate scrapes the adhesive adhering to the stirring plates downwards. Finally, the circular lifting plate reaches the bottom of the mixing tank, squeezing the adhesive between the circular lifting plate and the bottom of the mixing tank into the discharge pipe for discharge, reducing waste. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the mixing tank according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the mixing tank from another angle according to an embodiment of the present invention;

[0023] Figure 4 yes Figure 3 Enlarged view of part A;

[0024] Figure 5 yes Figure 3 Enlarged view of part B;

[0025] Figure 6 This is a structural schematic diagram of the circular lifting plate and guide rod in an embodiment of this utility model.

[0026] In the diagram: 10. Mixing tank; 11. Feed pipe; 12. Discharge pipe; 13. Rotating shaft; 14. Stirring plate; 15. Fixing strip; 16. Water inlet pipe; 17. Control solenoid valve; 20. Drive assembly; 21. Fixing seat; 22. Drive motor; 30. Circular lifting plate; 31. Sliding hole; 32. Strip hole; 40. Lifting assembly; 41. Guide rod; 42. Connecting ring; 43. Second threaded rod; 44. Nut seat; 45. Sprocket; 46. Chain; 47. Driven wheel; 48. Power motor; 49. Drive wheel; 50. Fixing assembly; 51. Mounting seat; 52. Connecting plate; 53. L-shaped seat; 54. First threaded rod; 55. Handle; 56. Fixing hole. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] like Figure 1-6As shown in the illustration, this application discloses an efficient adhesive mixing device, including a mixing tank 10, a rotating shaft 13, stirring plates 14, a circular lifting plate 30, a lifting assembly 40, and a fixing assembly 50. The mixing tank 10 is equipped with a feed pipe 11, and a feed solenoid valve is installed on the feed pipe 11 to control the feeding. A discharge pipe 12 is installed at the bottom of the mixing tank 10, and a discharge solenoid valve is installed on the discharge pipe 12 to control the discharge. The rotating shaft 13 is vertically rotatable within the mixing tank 10, and a drive assembly 20 is installed at the top of the mixing tank 10 to drive the rotating shaft 13 to rotate. Several sets of stirring plates 14 are vertically spaced on the rotating shaft 13, each set including two symmetrically arranged stirring plates 14. The drive assembly 20 drives the rotating shaft 13 to rotate, thereby rotating the several sets of stirring plates 14 to efficiently mix the adhesive within the mixing tank 10.

[0029] A circular lifting plate 30 is vertically slidably disposed inside the mixing tank 10. The diameter of the circular lifting plate 30 is the same as the inner diameter of the mixing tank 10. A lifting assembly 40 is disposed on the top of the mixing tank 10 and is used to drive the circular lifting plate 30 to rise and fall. A sliding hole 31 is provided in the middle of the circular lifting plate 30, and the sliding hole 31 contacts the outer wall of the rotating shaft 13. Two strip-shaped holes 32 are symmetrically provided on the circular lifting plate 30, and the top shape of the stirring plate 14 is consistent with the shape of the strip-shaped holes 32. Both strip-shaped holes 32 are connected to the sliding hole 31. A fixing assembly 50 is provided on the top of the mixing tank 10 to fix the rotating shaft 13 so that the projected surface of the top of the stirring plate 14 is aligned with the strip-shaped holes 32. After stirring, the rotating shaft 13 is rotated so that the projected surface of the top of the stirring plate 14 is aligned with the strip-shaped holes 32 and fixed by the fixing assembly 50. Subsequently, the lifting assembly 40 drives the circular lifting plate 30 to descend. During the descent, the circular lifting plate 30 scrapes the adhesive adhering to the inner wall of the mixing tank 10 downwards. Simultaneously, several stirring plates 14 pass through the strip-shaped holes 32, and the circular lifting plate 30 scrapes the adhesive adhering to the stirring plates 14 downwards. Finally, the circular lifting plate 30 reaches the bottom of the mixing tank 10, squeezing the adhesive between the circular lifting plate 30 and the bottom of the mixing tank 10 into the discharge pipe 12 for discharge, reducing waste.

[0030] Specifically, the drive assembly 20 includes a fixed base 21 disposed on the top of the mixing tank 10. A drive motor 22 is vertically disposed on the fixed base 21. The output shaft of the drive motor 22 is downward and connected to the upper end of the rotating shaft 13, driving the rotating shaft 13 to rotate. Two fixing strips 15 are symmetrically disposed at the bottom of the mixing tank 10. The top surface shape of the fixing strip 15 is consistent with the bottom surface shape of the stirring plate 14, and the length direction of the fixing strip 15 is consistent with the length direction of the stirring plate 14. When the circular lifting plate 30 descends to a position near the bottom of the mixing tank 10, the protrusions are engaged in the strip-shaped hole 32, sealing the strip-shaped hole 32. This ensures that when the circular lifting plate 30 squeezes the adhesive at the bottom of the mixing tank 10, the adhesive will not pass through the strip-shaped hole 32.

[0031] During setup, the fixing assembly 50 includes a mounting base 51 positioned on top of the mixing tank 10. The upper end of the rotating shaft 13 passes through the mounting base 51, and two connecting plates 52 are symmetrically arranged thereon. The length direction of the connecting plates 52 is consistent with the length direction of the stirring plate 14, allowing the position of the stirring plate 14 to be determined based on the position of the connecting plates 52. An L-shaped seat 53 is provided on the mounting base 51. The lower end of the vertical section of the L-shaped seat 53 connects to the mounting base 51, and a threaded hole is vertically opened on the horizontal section. A first threaded rod 54 is spirally arranged inside the threaded hole, and a handle 55 is provided at the upper end of the first threaded rod 54. A fixing hole 56 is opened on the connecting plate 52. When the lower end of the first threaded rod 54 is located within the fixing hole 56, the position of the connecting plate 52 is fixed. The width of the connecting plate 52 is consistent with the width of the L-shaped seat 53. When both side walls of the connecting plate 52 and the side walls of the L-shaped seat 53 are coplanar, one of the fixing holes 56 is concentric with the threaded hole. When adjusting the position of the connecting plate 52 by rotating the rotating shaft 13, the concentricity of the fixing hole 56 and the threaded hole can be determined by whether the side wall of the connecting plate 52 is aligned with the side wall of the L-shaped seat 53. Rotate the rotating shaft 13 so that the fixing hole 56 on one of the connecting plates 52 is concentric with the threaded hole. Then rotate the handle 55 to drive the first threaded rod 54 to rotate. When the first threaded rod 54 rotates, it rises and falls relative to the L-shaped seat 53. When the lower end of the first threaded rod 54 is located in the fixing hole 56, the position of the connecting plate 52 is fixed, thereby fixing the positions of the rotating shaft 13 and the stirring plate 14.

[0032] Two guide holes are symmetrically opened on the top of the mixing tank 10. The lifting assembly 40 includes guide rods 41 that are vertically slidably disposed in the guide holes. The lower ends of the two guide rods 41 are connected to the circular lifting plate 30, and the upper ends are jointly provided with a connecting ring 42. Two second threaded rods 43 are vertically disposed on the connecting ring 42. A through hole is opened on the top of the mixing tank 10 corresponding to the second threaded rods 43. The lower ends of the second threaded rods 43 pass through the through hole and are connected to the circular lifting plate 30. A nut seat 44 is rotatably disposed on the top of the mixing tank 10 corresponding to the second threaded rods 43. The nut seat 44 is helically connected to the second threaded rods 43. When the nut seat 44 rotates, it can drive the second threaded rods 43 to rise and fall. A sprocket 45 is sleeved on the nut seat 44. The two sprockets 45 are connected by a chain 46. The sprockets 45 and the chain 46 ensure that the two nut seats 44 rotate synchronously, thereby driving the two second threaded rods 43 to rise and fall synchronously, and thus driving the circular lifting plate 30 to rise and fall. A driven wheel 47 is fixedly sleeved on one of the second threaded rods 43. A power motor 48, which is an eccentric motor, is vertically installed on the outer wall of the mixing tank 10. A driving wheel 49 is installed on the output axis of the power motor 48. The driving wheel 49 meshes with the driven wheel 47. The power motor 48 drives the driving wheel 49 to rotate, which in turn drives the driven wheel 47 to rotate, thereby driving the second threaded rod 43 connected to it to rotate.

[0033] In the specific setup, the mixing tank 10 is equipped with a water inlet pipe 16, which is connected to an external water source. A control solenoid valve 17 is installed on the water inlet pipe 16. When the circular lifting plate 30 reaches the bottom of the mixing tank 10 and squeezes out the adhesive, the lifting assembly 40 drives the circular lifting plate 30 to rise to the middle of the mixing tank 10. The height of the circular lifting plate 30 is controlled to ensure it is offset from the height of the stirring plate 14. Then, the control solenoid valve 17 opens, allowing external water to enter the mixing tank 10 through the water inlet pipe 16. Next, the drive assembly 20 drives the rotating shaft 13 to rotate, causing the stirring plate 14 to agitate the water flow and clean the inside of the mixing tank 10. After cleaning, the discharge solenoid valve is opened to discharge the water. Finally, after the rotating shaft 13 is fixed by the fixing assembly 50, the lifting assembly 40 drives the circular lifting plate 30 back to the top of the mixing tank 10.

[0034] The operating principle of the high-efficiency adhesive mixing device in this embodiment is as follows: The drive motor 22 is started to drive the rotating shaft 13 to rotate, which in turn drives several sets of stirring plates 14 to rotate, efficiently mixing the adhesive in the mixing tank 10. After mixing, the rotating shaft 13 is rotated so that the fixing hole 56 on one of the connecting plates 52 is concentric with the threaded hole. Then, the handle 55 and the first threaded rod 54 are rotated. When the lower end of the first threaded rod 54 is located in the fixing hole 56, the positions of the connecting plate 52, the rotating shaft 13, and the stirring plates 14 are fixed. Next, the power motor 48 is started to drive the driving wheel 49 to rotate, which in turn drives the driven wheel 47, the sprocket 45, and the nut seat 44 to rotate, causing the second threaded rod 43 and the circular lifting plate 30 to descend. During the descent of the circular lifting plate 30, the adhesive adhering to the inner wall of the mixing tank 10 is scraped downwards. At the same time, several stirring plates 14 pass through the strip hole 32, and the circular lifting plate 30 scrapes the adhesive adhering to the stirring plates 14 downwards. Finally, the circular lifting plate 30 reaches the bottom of the mixing tank 10, squeezing the adhesive between the circular lifting plate 30 and the bottom of the mixing tank 10 into the discharge pipe 12 for discharge, reducing waste.

[0035] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A high-efficiency adhesive mixing device, characterized in that: The system includes a mixing tank (10), which has an inlet pipe (11) and an outlet pipe (12) at its bottom. A rotating shaft (13) is vertically rotatable inside the mixing tank (10). A drive assembly (20) for driving the rotating shaft (13) is located at the top of the mixing tank (10). Several sets of stirring plates (14) are vertically spaced on the rotating shaft (13), each set including two symmetrically arranged stirring plates (14). A circular lifting plate (30) is vertically slidably installed inside the mixing tank (10). The diameter of the circular lifting plate (30) is... With the same inner diameter as the mixing tank (10), the top of the mixing tank (10) is provided with a lifting assembly (40) for driving the circular lifting plate (30) to rise and fall. The circular lifting plate (30) has a sliding hole (31) in the middle. The sliding hole (31) is in contact with the outer wall of the rotating shaft (13). The circular lifting plate (30) has two symmetrical strip holes (32) that are connected to the sliding hole (31). The top of the mixing tank (10) is provided with a fixing assembly (50) for fixing the rotating shaft (13) so that the projection surface of the top of the stirring plate (14) is aligned with the strip hole (32).

2. The adhesive high-efficiency mixing device according to claim 1, characterized in that: The fixing component (50) includes a mounting base (51) set on the top of the mixing tank (10). The upper end of the rotating shaft (13) passes through the mounting base (51) and two connecting plates (52) are symmetrically arranged. The length direction of the connecting plate (52) is consistent with the length direction of the stirring plate (14). An L-shaped seat (53) is provided on the mounting base (51). The lower end of the vertical section of the L-shaped seat (53) is connected to the mounting base (51), and a threaded hole is vertically opened on the horizontal section. A first threaded rod (54) is spirally arranged in the threaded hole. A handle (55) is provided on the upper end of the first threaded rod (54). A fixing hole (56) is opened on the connecting plate (52). When the lower end of the first threaded rod (54) is located in the fixing hole (56), the position of the connecting plate (52) is fixed.

3. The adhesive high-efficiency mixing device according to claim 1, characterized in that: The mixing tank (10) has two symmetrical guide holes on its top. The lifting assembly (40) includes guide rods (41) that are vertically slidably disposed in the guide holes. The lower ends of the two guide rods (41) are connected to the circular lifting plate (30), and the upper ends are provided with a connecting ring (42). The connecting ring (42) is provided with two second threaded rods (43) vertically. The top of the mixing tank (10) is provided with a through hole corresponding to the second threaded rods (43). The lower end of the second threaded rods (43) passes through the through hole and is connected to the circular lifting plate (30). The top of the mixing tank (10) is provided with a nut seat (44) rotatably disposed corresponding to the second threaded rods (43). The nut seat (44) is helically connected to the second threaded rods (43). A sprocket (45) is sleeved on the nut seat (44), and the two sprockets (45) are connected by a chain (46).

4. The adhesive high-efficiency mixing device according to claim 3, characterized in that: one of them A driven wheel (47) is fixedly sleeved on the second threaded rod (43). A power motor (48) is vertically arranged on the outer wall of the mixing tank (10). A driving wheel (49) is arranged on the output axis of the power motor (48). The driving wheel (49) meshes with the driven wheel (47).

5. The adhesive high-efficiency mixing device according to claim 1, characterized in that: Two fixing strips (15) are symmetrically arranged at the bottom of the mixing tank (10). The top surface shape of the fixing strip (15) is consistent with the bottom surface shape of the stirring plate (14), and the length direction of the fixing strip (15) is consistent with the length direction of the stirring plate (14).

6. The adhesive high-efficiency mixing device according to claim 1, characterized in that: The drive assembly (20) includes a fixed base (21) disposed on the top of the mixing tank (10), and a drive motor (22) is vertically disposed on the fixed base (21). The output shaft of the drive motor (22) is downward and connected to the upper end of the rotating shaft (13).

7. The adhesive high-efficiency mixing device according to claim 1, characterized in that: The mixing tank (10) is provided with a water inlet pipe (16), which is connected to an external water source, and a control solenoid valve (17) is provided on the water inlet pipe (16).