Waterproof coating dispersing machine

By designing transmission components and clamping components in the waterproof coating disperser, the problems of poor stability of the coating barrel and inconvenient movement of the device are solved, and the stable fixation of the coating barrel and efficient dispersion and stirring of the coating are achieved.

CN222766101UActive Publication Date: 2025-04-18竣云环保科技工程(上海)有限公司
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Patent Information

Application Number
CN202420467077.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-11
Publication Date
2025-04-18
Estimated Expiration
2034-03-11

AI Technical Summary

Technical Problem

The existing waterproof coating dispersers lack the fixation of the coating bucket, which leads to poor stability during use and inconvenient movement of the device.

Method used

A waterproof coating disperser is designed. By setting up transmission components and clamping components such as L-shaped tooth plates, gears, worms, worm gears, rotating shafts, sprockets and clamping components, the fixing and stability of the coating can be improved, and the dispersed stirring tray is driven by the electric hydraulic cylinder and the motor to disperse and stir the paint.

Benefits of technology

Through the design of the clamping assembly, the stability of the coating barrel is increased, and through the cooperation of the transmission assembly, the stable movement of the device and the efficient dispersed and stirring of the coating are achieved, avoiding the overflow of the coating.

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Abstract

The utility model discloses a waterproof coating dispersion machine, which relates to the technical field of dispersion machines and comprises a bottom plate, a transmission component is fixedly connected to the right end of the upper surface of the bottom plate, and the upper side of the transmission component is in meshing transmission with an L-shaped toothed plate. According to the utility model, the L-shaped toothed plate and the gear are matched with each other, so that the worm can be driven to rotate in the process of driving the shell to move downwards, and the two rotating shafts II can be driven to rotate through the rotation of the worm under the mutual matching of the worm gear, the rotating shaft I, the chain wheel III and the chain wheel IV; the rotating directions of two rotating shafts II are opposite, two vertical plates can be driven to be close to each other through rotation of the two rotating shafts II under the action of an arranged cam I, at the moment, the effect of clamping and fixing the coating barrel can be achieved under the action of an arranged clamping plate, and the stability of the coating barrel in the coating dispersing and stirring process is improved.
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Description

Technical Field

[0001] The utility model relates to a coating dispersing machine, in particular to a waterproof coating dispersing machine. Background Art

[0002] With the rapid development of people's living standards, waterproof coatings are used more and more widely in decoration. After waterproof coatings are applied on the wall, a waterproof film will be formed on its surface to improve the waterproof performance of the wall. In the production process of waterproof coatings, additives need to be continuously added and dispersed and stirred, so a waterproof coating disperser is needed.

[0003] At present, there are still some defects and deficiencies in the use of paint dispersers. The specific areas that need to be improved are as follows:

[0004] Most of the existing waterproof coating dispersing machines lack the ability to fix the coating bucket during use, which results in poor stability of the coating bucket during use and inconvenience in moving the device. Utility Model Content

[0005] The purpose of the utility model is to provide a waterproof coating disperser to solve the problem that the existing waterproof coating dispersers mentioned in the above background technology are mostly lack of fixing of the coating bucket during use, which leads to poor stability of the coating bucket during use and inconvenience in moving the device.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a waterproof coating disperser, comprising a base plate, a transmission assembly is fixedly connected to the right end of the upper surface of the base plate, the upper side of the transmission assembly is meshed with an L-shaped tooth plate for transmission, the front and rear sides of the lower end of the transmission assembly are respectively fixedly connected to the right ends of two clamping assemblies, the lower ends of the two clamping assemblies are fixedly connected to the upper end of the base plate, the lower sides of the two clamping assemblies are overlapped with the upper end of the limit assembly, the lower end of the limit assembly passes through the base plate with four circular holes opened inside and is arranged on the lower side of the base plate, the upper end of the base plate is fixedly connected to an electric hydraulic cylinder, the upper end of the electric hydraulic cylinder is fixedly connected to the lower end of a shell, the right side of the lower end of the shell is fixedly connected to a motor, the motor output shaft passes through the lower side wall of the shell and is fixedly connected to a sprocket wheel 1, the sprocket wheel 1 is transmission-connected to a sprocket wheel 2 through a chain, the sprocket wheel 2 is fixedly connected to the upper end of a rotating rod, the rotating rod is movably connected to a connecting sleeve, and the lower end of the rotating rod is fixedly connected to a dispersing stirring disk.

[0007] As a preferred technical solution of the utility model, the upper side of the connecting sleeve is fixedly connected to a shell having a circular hole opened inside the lower end, and the lower side of the connecting sleeve is fixedly connected to a circular cover plate.

[0008] As a preferred technical solution of the utility model, the base plate is provided with a paint bucket through a placement groove opened inside its upper end, movable wheels are provided at the four corners of the bottom surface of the base plate, and the upper end of the L-shaped toothed plate is fixedly connected to the lower end of the shell.

[0009] As a preferred technical solution of the utility model, the transmission assembly includes a gear, which is meshed with an L-shaped toothed plate for transmission, and the gear is fixedly connected to the middle light rod position of the worm, and the light rod positions on the front and rear sides of the worm are movably connected with a support plate one, and the lower ends of the two support plates one are fixedly connected to the upper end of the base plate, and the worm is meshed with two worm wheels for transmission, and the two worm wheels are respectively fixedly connected to the right ends of two rotating shafts one.

[0010] As an optimal technical solution of the utility model, the left ends of the two rotating shafts 1 are fixedly connected with sprocket three, the two sprocket three are respectively connected to the two sprocket fours through another chain, the two sprocket fours are respectively fixedly connected to the right ends of the two clamping assemblies, the two rotating shafts 1 are movably connected with support plates 2, and the lower ends of the two support plates 2 are fixedly connected to the upper end of the base plate.

[0011] As a preferred technical solution of the utility model, the two clamping assemblies each include a rotating shaft 2, the right ends of the two rotating shafts 2 are respectively fixedly connected to two sprocket wheels 4, the left and right sides of the two rotating shafts 2 are movably connected with support plates 3, the lower ends of the four support plates 3 are fixedly connected to the upper end of the base plate, and the left sides of the two rotating shafts 2 are fixedly connected with two cams 1.

[0012] As a preferred technical solution of the utility model, the four cams are grouped in pairs, and their relatively close ends are overlapped with the relatively distant ends of the two vertical plates respectively, the relatively close ends of the two vertical plates are fixedly connected with a clamping plate, the relatively distant ends of the two vertical plates are fixedly connected with two cross bars, and the four cross bars are grouped in pairs and movably connected with two fixed plates each having two circular holes provided therein.

[0013] As a preferred technical solution of the utility model, the lower ends of the two fixed plates are fixedly connected to the upper end of the base plate, the four cross bars are sleeved with springs 1, the four springs are grouped in pairs, and their relatively close ends are respectively fixedly connected to the relatively distant ends of the two vertical plates, the four springs are grouped in pairs, and their relatively distant ends are respectively fixedly connected to the relatively close ends of the two fixed plates, the right sides of the two rotating shafts 2 are fixedly connected with cams 2, and the lower ends of the two cams 2 overlap the upper end of the limit assembly.

[0014] As a preferred technical solution of the utility model, the limit assembly includes two lap plates, the upper ends of the two lap plates are respectively overlapped with the lower ends of the two cams 2, the lower ends of the two lap plates are fixedly connected to two connecting rods, the lower ends of the four connecting rods respectively pass through the four circular holes opened inside the base plate and are fixedly connected to the upper end of the limit plate, the four connecting rods are sleeved with springs 2, the four springs 2 are grouped in pairs and their upper ends are respectively fixedly connected to the lower ends of the two lap plates, and the lower ends of the four springs 2 are fixedly connected to the upper end of the base plate.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model can drive the worm to rotate in the process of driving the shell to move downward by the cooperation between the arranged L-shaped toothed plate and the gear. The rotation of the worm can drive the two rotating shafts to rotate under the cooperation between the arranged worm wheel, rotating shaft one, sprocket three and sprocket four, and the two rotating shafts two turn in opposite directions. The rotation of the two rotating shafts two can drive the two vertical plates to approach each other under the action of the arranged cam one. At this time, the clamping and fixing effect of the paint bucket can be achieved under the action of the arranged clamping plate, thereby increasing the stability of the paint bucket in the process of dispersing and stirring the paint by the device. In the process of clamping and fixing the paint bucket, The rotation of the two rotating shafts 2 can drive the limit plate to move downward under the action of the set cam 2, the overlap plate and the connecting rod until the lower end of the limit plate overlaps the ground. At this time, the movement of the device can be restricted, thereby increasing the stability of the device during use. The circular cover plate can be set to prevent the paint from overflowing from the paint bucket during the process of dispersing and stirring the paint inside the paint bucket. The mutual cooperation between the set motor, sprocket 1 and sprocket 2 can drive the rotating rod to rotate. Through the rotation of the rotating rod, the dispersion and stirring process of the paint inside the paint bucket can be achieved under the action of the set dispersion stirring plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main three-dimensional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the main cross-sectional three-dimensional structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the main three-dimensional structure of the transmission component of the utility model;

[0020] Figure 4 This is a schematic diagram of the main three-dimensional structure of the limit assembly of the utility model;

[0021] Figure 5 It is a schematic diagram of the main three-dimensional structure of the clamping assembly of the utility model.

[0022] In the figure: 1 bottom plate, 2 moving wheel, 3 paint bucket, 4 clamping assembly, 41 clamping plate, 42 support plate three, 43 cam one, 44 spring one, 45 fixed plate, 46 cross bar, 47 vertical plate, 48 rotating shaft two, 49 cam two, 5 limit assembly, 51 limit plate, 52 connecting rod, 53 spring two, 54 lap plate, 6 electric hydraulic cylinder, 7 transmission assembly, 71 support plate two, 72 sprocket four, 73 support plate one, 74 gear, 75 worm wheel, 76 sprocket three, 77 rotating shaft one, 78 worm, 8 dispersion stirring plate, 9 rotating rod, 10 circular cover plate, 11 connecting sleeve, 12 shell, 13 L-shaped tooth plate, 14 motor, 15 sprocket two, 16 sprocket one. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1-5As shown, the utility model provides a technical solution: a waterproof coating disperser, comprising a base plate 1, a transmission assembly 7 is fixedly connected to the right end of the upper surface of the base plate 1, the upper side of the transmission assembly 7 is meshed with the L-shaped tooth plate 13 for transmission, the front and rear sides of the lower end of the transmission assembly 7 are respectively fixedly connected to the right ends of the two clamping assemblies 4, the lower ends of the two clamping assemblies 4 are fixedly connected to the upper end of the base plate 1, the lower sides of the two clamping assemblies 4 are overlapped with the upper ends of the limiting assemblies 5, the lower ends of the limiting assemblies 5 pass through the base plate 1 with four circular holes opened inside and are arranged on the lower side of the base plate 1, the upper end of the base plate 1 is fixedly connected to the electric hydraulic cylinder 6, the shell 12 is driven to move downward by starting the electric hydraulic cylinder 6, and then the dispersing stirring plate 8 can be driven to move downward to the inside of the coating bucket 3 under the action of the provided connecting sleeve 11 and the rotating rod 9, and in the process of driving the shell 12 to move downward, the coating bucket 3 can be fixed under the action of the provided L-shaped tooth plate 13, the transmission assembly 7 and the clamping assembly 4. , thereby increasing the stability of the paint bucket during the paint dispersion and stirring process. In the process of fixing the paint bucket 3, the movement of the device can be restricted under the action of the set clamping assembly 4 and the limit assembly 5, thereby increasing the stability of the device during use. The upper end of the electric hydraulic cylinder 6 is fixedly connected to the lower end of the shell 12, and the right side of the lower end of the shell 12 is fixedly connected to a motor 14. The output shaft of the motor 14 passes through the lower side wall of the shell 12 and is fixedly connected to a sprocket 16. The sprocket 16 is transmission-connected to the sprocket 2 15 through a set chain. The sprocket 2 15 is fixedly connected to the upper end of the rotating rod 9, and the rotating rod 9 is movably connected to the connecting sleeve 11. The lower end of the rotating rod 9 is fixedly connected to a dispersion stirring disk 8. The rotation of the output shaft of the motor 14 can drive the rotating rod 9 to rotate under the action of the set sprocket 1 16 and the sprocket 2 15. The rotation of the rotating rod 9 under the action of the set dispersion stirring disk 8 can achieve the dispersion and stirring process of the paint inside the paint bucket 3.

[0025] The upper side of the connecting sleeve 11 is fixedly connected to a shell body 12 with a circular hole opened inside the lower end, and the lower side of the connecting sleeve 11 is fixedly connected to a circular cover plate 10. The paint bucket 3 is placed on the bottom plate 1 through the placement groove opened inside the upper end thereof. Moving wheels 2 are arranged at the four corners of the bottom surface of the bottom plate 1. The upper end of the L-shaped tooth plate 13 is fixedly connected to the lower end of the shell body 12. The circular cover plate 10 can prevent the paint from overflowing from the paint bucket 3 during the process of dispersing and stirring the paint, so that the moving wheels 2 can make the movement of the device more convenient.

[0026] The transmission assembly 7 includes a gear 74, which is meshed with the L-shaped toothed plate 13 for transmission. The gear 74 is fixedly connected to the middle polished rod position of the worm 78. The polished rod positions on both sides of the worm 78 are movably connected with support plates 1 73. The lower ends of the two support plates 1 73 are fixedly connected to the upper end of the bottom plate 1. The worm 78 is meshed with two worm wheels 75 for transmission. The two worm wheels 75 are respectively fixedly connected to the right ends of the two rotating shafts 1 77. The left ends of the two rotating shafts 1 77 are fixedly connected with sprocket wheels 3 76. The two sprocket wheels 3 76 are respectively connected to the two sprocket wheels 4 72 for transmission through another chain. The two sprocket wheels 4 72 are respectively connected to the two The right end of the clamping assembly 4 is fixedly connected, and the two rotating shafts 1 77 are movably connected with support plates 2 71. The lower ends of the two support plates 2 71 are fixedly connected to the upper end of the base plate 1. In the process of driving the shell 12 to move downward, the L-shaped tooth plate 13 and the gear 74 can drive the worm 78 to rotate. The worm 78 meshes with the two worm wheels 75 for transmission, and then can drive the two rotating shafts 1 77 to rotate, and the two rotating shafts 1 77 have opposite directions. Through the rotation of the two rotating shafts 1 77, the two sprocket wheels 4 72 can be driven to rotate under the action of the two sprocket wheels 3 76.

[0027] The two clamping assemblies 4 each include a rotating shaft 2 48, the right ends of the two rotating shafts 2 48 are respectively fixedly connected to the two sprocket wheels 4 72, the left and right sides of the two rotating shafts 2 48 are movably connected with support plates 3 42, the lower ends of the four support plates 3 42 are fixedly connected to the upper end of the bottom plate 1, the left sides of the two rotating shafts 2 48 are fixedly connected with two cams 1 43, the four cams 1 43 are grouped in pairs, and their relatively close ends are respectively overlapped with the relatively far ends of the two vertical plates 47, the relatively close ends of the two vertical plates 47 are fixedly connected with clamping plates 41, the relatively far ends of the two vertical plates 47 are fixedly connected with two cross bars 46, the four cross bars 46 are grouped in pairs and are respectively movably connected with two fixed plates 45 each having two circular holes therein, and the two fixed plates The lower ends of 45 are fixedly connected to the upper end of the bottom plate 1, and the four cross bars 46 are sleeved with springs 1 44. The right sides of the two rotating shafts 48 are fixedly connected with cams 2 49, and the lower ends of the two cams 2 49 are overlapped with the upper end of the limit assembly 5. The rotation of the two sprocket wheels 472 can drive the two rotating shafts 48 to rotate. The rotation of the two rotating shafts 48 can drive the two vertical plates 47 to approach each other under the action of the four cams 1 43. At this time, the paint bucket 3 can be clamped and fixed under the action of the two clamping plates 41, thereby increasing the stability of the paint bucket 3. The movement direction of the vertical plate 47 can be restricted by the mutual cooperation between the cross bar 46 and the fixed plate 45.

[0028] The limiting assembly 5 includes two lap plates 54, the upper ends of the two lap plates 54 are overlapped with the lower ends of the two cams 49 respectively, and the lower ends of the two lap plates 54 are fixedly connected to two connecting rods 52. The lower ends of the four connecting rods 52 respectively pass through the four circular holes opened inside the bottom plate 1 and are fixedly connected to the upper end of the limiting plate 51. The four connecting rods 52 are all sleeved with springs 53. In the process of driving the two vertical plates 47 to approach each other, the two lap plates 54 can be driven to move downward under the action of the two cams 49 through the rotation of the two rotating shafts 48, and then the limiting plate 51 can be driven to move downward under the action of the connecting rods 52 until the lower end of the limiting plate 51 overlaps the ground. At this time, the movement of the device can be restricted, thereby increasing the stability of the device during use.

[0029] The operating steps of the utility model are:

[0030] When the device is used to disperse and stir the waterproof coating, the material is first placed inside the coating bucket 3, and then the electric hydraulic cylinder 6 is started to drive the shell 12 to move downward, thereby driving the circular cover plate 10 and the dispersion stirring plate 8 to move downward. In the process of driving the shell 12 to move downward, the worm 78 can be driven to rotate under the action of the L-shaped toothed plate 13 and the gear 74. The rotation of the worm 78 can drive the two rotating shafts 48 to rotate under the action of the worm wheel 75, the rotating shaft 1 77, the sprocket three 76 and the sprocket four 72, and the two rotating shafts 48 turn in opposite directions. The rotation of the two rotating shafts 48 can drive the two vertical plates 47 to rotate relative to each other under the action of the cam 1 43. When the two vertical plates 47 are brought closer to each other, the two overlapping plates 54 can be driven to move downward under the action of the rotating shaft 2 48 and the cam 2 49, and then the limiting plate 51 can be driven to move downward under the action of the connecting rod 52 until its lower end overlaps the ground. When the circular cover plate 10 moves downward and overlaps the upper end of the paint bucket 3, the motor 14 is started, and the rotating rod 9 can be driven to rotate under the action of the sprocket 1 16 and the sprocket 2 15. Through the rotation of the rotating rod 9, the dispersion and stirring process of the material inside the paint bucket 3 can be achieved under the action of the dispersion and stirring disk 8.

[0031] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the present invention, unless otherwise clearly stipulated and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waterproof coating dispersing machine, comprising a bottom plate (1), characterized in that: The right end of the upper surface of the base plate (1) is fixedly connected with a transmission assembly (7), the upper side of the transmission assembly (7) is meshed with the L-shaped toothed plate (13) for transmission, the front and rear sides of the lower end of the transmission assembly (7) are respectively fixedly connected with the right ends of the two clamping assemblies (4), the lower ends of the two clamping assemblies (4) are fixedly connected to the upper end of the base plate (1), the lower sides of the two clamping assemblies (4) are overlapped with the upper end of the limit assembly (5), the lower end of the limit assembly (5) passes through the base plate (1) with four circular holes opened inside and is arranged on the lower side of the base plate (1), the upper end of the base plate (1) is fixedly connected An electric hydraulic cylinder (6) is connected, the upper end of the electric hydraulic cylinder (6) is fixedly connected to the lower end of the housing (12), the lower right side of the housing (12) is fixedly connected to a motor (14), the output shaft of the motor (14) passes through the lower side wall of the housing (12) and is fixedly connected to a sprocket wheel 1 (16), the sprocket wheel 1 (16) is transmission-connected to a sprocket wheel 2 (15) via a set chain, the sprocket wheel 2 (15) is fixedly connected to the upper end of a rotating rod (9), the rotating rod (9) is movably connected to a connecting sleeve (11), and the lower end of the rotating rod (9) is fixedly connected to a dispersing stirring disk (8).

2. A waterproof coating dispersing machine according to claim 1, characterized in that: The upper side of the connecting sleeve (11) is fixedly connected to a shell (12) with a circular hole formed inside the lower end, and the lower side of the connecting sleeve (11) is fixedly connected to a circular cover plate (10).

3. A waterproof coating dispersing machine according to claim 1, characterized in that: The bottom plate (1) is provided with a paint bucket (3) through a placement groove opened inside the upper end thereof, and moving wheels (2) are arranged at the four corners of the bottom surface of the bottom plate (1), and the upper end of the L-shaped toothed plate (13) is fixedly connected to the lower end of the shell (12).

4. A waterproof coating dispersing machine according to claim 1, characterized in that: The transmission assembly (7) includes a gear (74), the gear (74) is meshed with the L-shaped toothed plate (13) for transmission, the gear (74) is fixedly connected to the middle light rod position of the worm (78), the light rod positions on both sides of the front and rear of the worm (78) are movably connected with support plates (73), the lower ends of the two support plates (73) are fixedly connected to the upper end of the base plate (1), the worm (78) is meshed with two worm wheels (75) for transmission, and the two worm wheels (75) are respectively fixedly connected to the right ends of two rotating shafts (77).

5. A waterproof coating dispersing machine according to claim 4, characterized in that: The left ends of the two rotating shafts (77) are fixedly connected to sprocket wheels (76), and the two sprocket wheels (76) are respectively connected to two sprocket wheels (72) through another chain. The two sprocket wheels (72) are respectively fixedly connected to the right ends of the two clamping assemblies (4). The two rotating shafts (77) are movably connected to support plates (71), and the lower ends of the two support plates (71) are fixedly connected to the upper end of the bottom plate (1).

6. A waterproof coating dispersing machine according to claim 5, characterized in that: The two clamping assemblies (4) each include a rotating shaft 2 (48), the right ends of the two rotating shafts 2 (48) are respectively fixedly connected to two sprocket wheels 4 (72), the left and right sides of the two rotating shafts 2 (48) are movably connected to support plates 3 (42), the lower ends of the four support plates 3 (42) are fixedly connected to the upper end of the bottom plate (1), and the left sides of the two rotating shafts 2 (48) are fixedly connected to two cams 1 (43).

7. A waterproof coating dispersing machine according to claim 6, characterized in that: The four cams (43) are arranged in groups of two, and their relatively close ends are overlapped with the relatively far ends of the two vertical plates (47). The relatively close ends of the two vertical plates (47) are fixedly connected with a clamping plate (41). The relatively far ends of the two vertical plates (47) are fixedly connected with two cross bars (46). The four cross bars (46) are arranged in groups of two, and are movably connected with two fixed plates (45) each having two circular holes therein.

8. A waterproof coating dispersing machine according to claim 7, characterized in that: The lower ends of the two fixed plates (45) are fixedly connected to the upper end of the bottom plate (1), the four cross bars (46) are sleeved with springs 1 (44), the right sides of the two rotating shafts 2 (48) are fixedly connected with cams 2 (49), and the lower ends of the two cams 2 (49) are overlapped with the upper end of the limit assembly (5).

9. A waterproof coating dispersing machine according to claim 8, characterized in that: The limiting assembly (5) comprises two lap plates (54), the upper ends of the two lap plates (54) are respectively overlapped with the lower ends of the two cams (49), the lower ends of the two lap plates (54) are fixedly connected to two connecting rods (52), the lower ends of the four connecting rods (52) respectively pass through four circular holes opened inside the bottom plate (1) and are fixedly connected to the upper end of the limiting plate (51), and the four connecting rods (52) are all sleeved with springs (53).