Polyurethane emulsion preparation device

Abstract

The invention relates to the technical field of polyurethane emulsion preparation, in particular to a polyurethane emulsion preparation device which comprises a tank body, and a stirring mechanism is rotationally connected to the tank body through a bearing; the stirring mechanism is fixedly connected with a first friction wheel, the first friction wheel is provided with an inclined curved surface, the inclined curved surface abuts against a second friction wheel, the second friction wheel is in transmission connection with the motor, the tank body is fixedly connected with a supporting frame, and the supporting frame is rotationally connected with a threaded rod through a bearing; the axis of the threaded rod is parallel to the extension line of the abutting position of the second friction wheel and the first friction wheel, the threaded rod is in threaded connection with a threaded cylinder, the threaded cylinder is fixedly connected to the motor, and the positioning sleeve is fixedly connected to the supporting frame. The high-speed stirring device has the advantages that along with emulsification, the high-speed stirring speed is reduced, entering of air is reduced, generation of bubbles is reduced, and therefore the quality of emulsion is improved.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane emulsion preparation, in particular to a polyurethane emulsion preparation device. Background Art

[0002] Polyurethane, whose full name is polyurethane, is a polymer material with excellent mechanical properties formed by polyols and polyisocyanates through condensation reaction and has strong plasticity. When making polyurethane emulsion, the internal emulsification method, also known as the self-emulsification method, is the main method for preparing waterborne polyurethane resins on the market. The waterborne polyurethane prepared by the internal emulsification method has good stability and strong mechanical properties. When preparing by the internal emulsification method, the following steps are included: 1. Prepare polyurethane prepolymer; 2. Ionization, adding hydrophilic monomers or ionic chemical reagents to ionize the hydrophilic groups in the prepolymer to enhance its dispersibility in water; 3. During the emulsification process, the ionized prepolymer is dispersed in water under stirring conditions to form a stable waterborne polyurethane emulsion. High-speed stirring is used during stirring and emulsification. High-speed stirring helps mixing, but when it is close to completion, high-speed stirring will cause air to enter the emulsion to produce bubbles, which will affect the quality of the prepared polyurethane emulsion. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art that high-speed stirring will cause air to enter the emulsion to generate bubbles, which will affect the quality of the prepared polyurethane emulsion, and propose a polyurethane emulsion preparation device to solve the problems existing in the prior art that high-speed stirring will cause air to enter the emulsion to generate bubbles, which will affect the quality of the prepared polyurethane emulsion.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A polyurethane emulsion preparation device is designed, comprising a tank body, on which a stirring mechanism is rotatably connected via a bearing;

[0006] The stirring mechanism is fixedly connected with a first friction wheel, the first friction wheel is provided with an inclined curved surface, a second friction wheel is abutted on the inclined curved surface, the second friction wheel is transmission-connected to the motor, a support frame is fixedly connected to the tank body, a threaded rod is rotatably connected to the support frame through a bearing, the axis of the threaded rod is parallel to the extension line of the abutment point of the second friction wheel and the first friction wheel, a threaded barrel is threadedly connected to the threaded rod, the threaded barrel is fixedly connected to the motor, and the threaded rod is rotated by a trigger mechanism;

[0007] A positioning rod is fixedly connected to the motor, a positioning sleeve is sleeved on the positioning rod, and the positioning sleeve is fixedly connected to the support frame.

[0008] Preferably, the trigger mechanism includes a driving gear, which is fixedly connected to the stirring mechanism, a rotating shaft is rotatably connected to the tank body through a bearing, a first gear is fixedly connected to the rotating shaft, the first gear is meshed with the driving gear, an incomplete gear is fixedly connected to the rotating shaft, a supporting shaft is rotatably connected to the tank body through a bearing, a second gear is fixedly connected to the supporting shaft, the second gear is meshed with the incomplete gear, a threaded column is rotatably connected to the tank body through a bearing, a third gear is rotatably connected to the threaded column through a bearing, the third gear is meshed with the second gear, the third gear is connected to the threaded column through a clamping mechanism, a moving block is threadedly connected to the threaded column, a rack is fixedly connected to the moving block, a fourth gear is meshed on the rack, a worm is fixedly connected to the fourth gear, the worm is rotatably connected to the tank body through a bearing, a worm wheel is fixedly connected to the threaded rod, the worm wheel is meshed with the worm, a limiting rod is arranged through the moving block, and the limiting rod is fixedly connected to the tank body.

[0009] Preferably, the number of teeth of the first gear is greater than the number of teeth of the driving gear.

[0010] Preferably, the clamping mechanism includes a first magnet, which is fixedly connected to the second gear, a connecting cylinder is fixedly connected to the tank body, a piston is abutted in the connecting cylinder, a piston is fixedly connected to the piston, a second magnet is fixedly connected to the piston rod, the opposite surfaces of the second magnet and the first magnet are isotropic magnetic surfaces, an air hole is provided on the connecting cylinder, a cavity is provided on the threaded column, the cavity is rotatably connected to a connecting pipe through a sealed bearing, the connecting pipe is connected to the connecting cylinder, a plurality of conducting sleeves are fixedly connected to the threaded column, a plurality of conducting sleeves are connected to the cavity, a plurality of conducting sleeves are abutted with movable plugs, a plurality of movable plugs are fixedly connected with abutting columns, a connecting ring is fixedly connected to the third gear through a fixed column, and the abutting column moves to abut the connecting ring.

[0011] Preferably, the movable plug is fixedly connected to the inner wall of the connecting pipe with a spring.

[0012] Preferably, a valve is provided on the threaded column, and the valve is communicated with the cavity.

[0013] Preferably, the threaded column and the rotating shaft are rotatably connected with pulleys via a one-way bearing, and a belt is sleeved between the two pulleys.

[0014] Preferably, a retaining ring is fixedly connected to the inner wall of the connecting cylinder, and the inner diameter of the retaining ring is smaller than the diameter of the piston.

[0015] The invention provides a polyurethane emulsion preparation device, which has the beneficial effect that: when emulsification is nearly completed, the threaded rod is rotated to adjust the position of the threaded barrel on the threaded rod, so that the motor moves in the direction along the axis of the threaded rod, and the second friction wheel is moved to gradually abut against the upper end of the first friction wheel. Since the rotation speed of the motor is constant, the upper end diameter of the first friction wheel gradually increases, and the rotation speed of the stirring mechanism is gradually reduced, so that as the emulsification proceeds, the speed of high-speed stirring is reduced, which is beneficial to reduce the entry of air and the generation of bubbles, thereby facilitating the improvement of the quality of the emulsion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a polyurethane emulsion preparation device proposed by the present invention;

[0017] Figure 2 A three-dimensional cross-sectional view of a polyurethane emulsion preparation device proposed by the present invention;

[0018] Figure 3 The three-dimensional structure of the first friction wheel and the second friction wheel of the polyurethane emulsion preparation device proposed by the present invention Figure 1 ;

[0019] Figure 4 The three-dimensional structure of the first friction wheel and the second friction wheel of the polyurethane emulsion preparation device proposed by the present invention Figure 2 ;

[0020] Figure 5 A polyurethane emulsion preparation device proposed by the present invention Figure 4 Side view Figure 1 ;

[0021] Figure 6 A polyurethane emulsion preparation device proposed by the present invention Figure 4 Side view Figure 2 ;

[0022] Figure 7 It is a three-dimensional cross-sectional view of the third gear and the threaded column part of a polyurethane emulsion preparation device proposed by the present invention;

[0023] Figure 8 A polyurethane emulsion preparation device proposed by the present invention Figure 7 A partially cutaway stereogram;

[0024] Fig. 9 The present invention provides a schematic structural diagram of abutment posts and a conductive sleeve of a polyurethane emulsion preparation device.

[0025] In the figure: 1, tank body; 2, first friction wheel; 3, inclined surface; 4, second friction wheel; 5, first gear; 6, incomplete gear; 7, rotating shaft; 8, pulley; 9, second gear; 10, first magnet; 11, supporting shaft; 12, third gear; 13, worm gear; 14, stirring mechanism; 15, driving gear; 16, fourth gear; 17, threaded rod; 18, limiting rod; 19, rack; 20, worm; 21, moving block; 22, connecting cylinder; 23, connecting pipe; 24, threaded column; 25, motor; 26, moving plug; 27, threaded cylinder; 28, positioning sleeve; 29, positioning rod; 30, supporting frame; 31, cavity; 32, valve; 33, connecting ring; 34, abutting column; 35, conducting sleeve; 36, second magnet; 37, piston; 38, air hole; 39, piston rod; 40, spring; 41, belt. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Example 1: Reference Figure 1-6 A polyurethane emulsion preparation device comprises a tank body 1, to which a stirring mechanism 14 is rotatably connected via a bearing, for stirring and mixing ionized polyurethane prepolymer and water to form an emulsion.

[0028] A first friction wheel 2 is fixedly connected to the stirring mechanism 14, and the first friction wheel 2 is provided with an inclined curved surface 3, and a second friction wheel 4 is abutted on the inclined curved surface 3, and the second friction wheel 4 is transmission-connected to the motor 25. A support frame 30 is fixedly connected to the tank body 1, and a threaded rod 17 is rotatably connected to the support frame 30 through a bearing, and the axis of the threaded rod 17 is parallel to the extension line of the abutment point of the second friction wheel 4 and the first friction wheel 2, and a threaded barrel 27 is threadedly connected to the threaded rod 17, and the threaded barrel 27 is fixedly connected to the motor 25. The threaded rod 17 is rotated by a trigger mechanism, and when the ionized prepolymer is dispersed in water to form a stable aqueous polyurethane emulsion, the second friction wheel 4 is started. It abuts against the lower end of the first friction wheel 2, and the first friction wheel 2 is in the shape of an inverted truncated cone. When the emulsification is nearly completed, the threaded rod 17 is rotated to adjust the position of the threaded cylinder 27 on the threaded rod 7, so that the motor 25 moves along the axis of the threaded rod 17 in the direction, which will move the second friction wheel 4 and gradually abut against the upper end of the first friction wheel 2. Since the rotation speed of the motor 25 is constant, the upper end diameter of the first friction wheel 2 gradually increases, which will gradually reduce the rotation speed of the stirring mechanism 14, so that as the emulsification proceeds, the speed of high-speed stirring can be reduced, which is beneficial to reduce the entry of air and the generation of bubbles, thereby helping to improve the quality of the emulsion.

[0029] A positioning rod 29 is fixedly connected to the motor 25, and a positioning sleeve 28 is sleeved on the positioning rod 29. The positioning sleeve 28 is fixedly connected to the support frame 30. The positioning sleeve 28 and the positioning rod 29 are used to limit the motor 25. When the motor 25 moves, the position of the positioning rod 20 in the positioning sleeve 28 will be adjusted.

[0030] Embodiment 2: In embodiment 1, when the trigger mechanism drives the threaded rod 17 to rotate, the motor is generally used to drive it directly. When the motor is used for driving adjustment, it is necessary to manually control the motor to turn on and off to adjust the speed of the stirring mechanism 14. Automatic adjustment is not possible, which increases the inconvenience during emulsification. It is easy to turn on the motor only after the emulsification is completed, resulting in the device being in a high-speed rotation process, generating more bubbles, and affecting the quality of the emulsion. Figure 1-9 As another preferred embodiment of the present invention, on the basis of embodiment 1, the trigger mechanism includes a driving gear 15, the driving gear 15 is fixedly connected to the stirring mechanism 14, the tank body 1 is rotatably connected to the rotating shaft 7 through a bearing, the rotating shaft 7 is fixedly connected to the first gear 5, the first gear 5 is meshed with the driving gear 15, the number of teeth of the first gear 5 is greater than the number of teeth of the driving gear 15, because high-speed stirring is required when starting stirring, the first reduction transmission is performed by using the first gear 5 and the driving gear 15.

[0031] An incomplete gear 6 is fixedly connected to the rotating shaft 7, and a support shaft 11 is rotatably connected to the tank body 1 through a bearing. A second gear 9 is fixedly connected to the support shaft 11, and the second gear 9 is meshed with the incomplete gear 6. The incomplete gear 6 and the second gear 9 perform a second deceleration effect, so that the incomplete gear 6 rotates multiple circles before the second gear 9 rotates one circle.

[0032] The tank body 1 is rotatably connected with a threaded column 24 through a bearing, and the threaded column 24 is rotatably connected with a third gear 12 through a bearing, the third gear 12 is meshed with the second gear 9, and the third gear 12 is connected to the threaded column 24 through a clamping mechanism, and a moving block 21 is threadedly connected through the threaded column 24, and a rack 19 is fixedly connected to the moving block 21, and a fourth gear 16 is meshed on the rack 19, and a worm 20 is fixedly connected to the fourth gear 16, and the worm 20 is rotatably connected to the tank body 1 through a bearing, and the threaded column 24 is connected to the third gear 12 through a clamping mechanism, and the third gear 12 is connected to the threaded column 24 through a thread, and the moving block 21 is fixedly connected with a rack 19, and a fourth gear 16 is meshed on the rack 19, and a worm 20 is fixedly connected to the fourth gear 16, and the worm 20 is rotatably connected to the tank body 1 through a bearing, and the threaded column 24 is connected to the third gear 12 through a clamping mechanism, and the threaded column 24 is connected to the moving block 21 ... the fourth gear 16 is meshed with the fourth gear 16, and the worm The threaded rod 17 is fixedly connected with a worm wheel 13, which meshes with the worm 20. The moving block 21 is provided with a limit rod 18, which is fixedly connected to the tank body 1. When the emulsification is performed, stirring is required for several tens of minutes. When the second gear 9 rotates, when the first magnet 10 is aligned with the second magnet 36, the piston rod 39 is moved to squeeze the air in the connecting cylinder 22 into the cavity 31. The second gear 9 needs to rotate multiple times to continuously squeeze the air into the In the cavity 31, the pressure inside the cavity 31 will increase, so that the movable plug 26 is driven to move, so that the abutting column 34 abuts against the connecting ring 33. This process takes a period of time, so as to provide time for high-speed stirring and mixing, and ensure the emulsification effect. When the abutting column 34 is abutted and fixed, the second gear 9 rotates to drive the third gear 12 to rotate, so as to drive the threaded column 24 to rotate, thereby adjusting the position of the movable block 21 on the threaded column 24, driving the rack 19 to move, and driving the fourth gear 16 to rotate, so that the worm 20 drives the worm wheel 13 to rotate, and the worm wheel 13 drives the threaded rod 17 to rotate, and the position of the second friction wheel 4 is adjusted to play a role of deceleration, so that when the emulsification is about to be completed, the stirring speed is reduced, the entry of air is reduced, and the generation of bubbles is reduced, and automatic deceleration adjustment is performed, without manual control, which is conducive to the convenience of operation, and at the same time ensures the accuracy of the deceleration time node, and avoids the situation where the speed is reduced only after the emulsification is completed.

[0033] The clamping mechanism includes a first magnet 10, which is fixedly connected to the second gear 9. A connecting cylinder 22 is fixedly connected to the tank body 1, a piston 37 is abutted in the connecting cylinder 22, a piston rod 39 is fixedly connected to the piston 37, a second magnet 36 is fixedly connected to the piston rod 39, and the opposing surfaces of the second magnet 36 and the first magnet 10 are isotropic magnetic surfaces. A retaining ring is fixedly connected to the inner wall of the connecting cylinder 22, and the inner diameter of the retaining ring is smaller than the diameter of the piston 37. The retaining ring limits the piston 37 and prevents it from detaching from the connecting cylinder 22. When the first magnet 10 and the second magnet 36 are not opposite to each other, the piston rod 39 descends under the action of the gravity of the second magnet 36 to automatically reset.

[0034] An air hole 38 is provided on the connecting tube 22. The air hole 38 is used to allow external air to re-enter the connecting tube 22 through the air hole 38 after the piston 37 is reset. A cavity 31 is provided on the threaded column 24. The cavity 31 is rotatably connected to the connecting tube 23 through a sealed bearing. The connecting tube 23 is connected to the connecting tube 22. A one-way valve is provided on the connecting tube 23. A plurality of conducting sleeves 35 are fixedly connected to the threaded column 24. The plurality of conducting sleeves 35 are all connected to the cavity 31. Moving plugs 26 are abutted in the plurality of conducting sleeves 35. Abutting columns 34 are fixedly connected to the plurality of moving plugs 26. A connecting ring 33 is fixedly connected to the third gear 12 through a fixed column. The abutting column 34 moves to abut the connecting ring 33.

[0035] A spring 40 is fixedly connected between the movable plug 26 and the inner wall of the connecting pipe 23 . When the air in the cavity 31 is discharged, the restoring force of the spring 40 is used to reset the movable plug 26 .

[0036] A valve 32 is provided on the threaded column 24 , and the valve 32 is connected to the cavity 31 , so that the air in the cavity 31 can be discharged by opening the valve 32 .

[0037] Embodiment 3: In embodiment 2, since it takes several tens of minutes to move the second friction wheel 4 to the position of the upper end of the first friction wheel 2 to abut against it during adjustment, it takes the same amount of time to reversely rotate it to reset it during reset, which increases the inconvenience during operation. Figure 1-6 , as another preferred embodiment of the present invention, based on Example 2.

[0038] The threaded column 24 and the rotating shaft 7 are both rotatably connected with a pulley 8 through a one-way bearing, and a belt 41 is sleeved between the two pulleys 8. Since the threaded column 24 is provided with a third gear 12, and the rotating shaft 7 is provided with an incomplete gear 6, the incomplete gear 6 and the third gear 12 are meshed with the second gear 9, so that the threaded column 24 and the rotating shaft 7 have the same rotation direction. When the forward rotation is performed to stir and emulsify, the one-way bearing is in a free rotation state, and the two pulleys 8 do not rotate. When the reverse rotation is reset, the two one-way bearings are in a locked state, and the pulley 8 and the belt 41 are locked. Under the action of , the threaded column 24 is driven to rotate, thereby adjusting the position of the moving block 21 on the threaded column 24, driving the rack 19 to move, driving the fourth gear 16 to rotate, so that the worm 20 drives the worm wheel 13 to rotate, and the worm wheel 13 drives the threaded rod 17 to rotate, and the second friction wheel 4 is reset, shortening the reset time, which is beneficial to the convenience of operation. When resetting, the valve 32 is opened, and under the action of the restoring force of the spring 40, the abutment column 34 is driven to move, and the abutment with the connecting ring 33 is released. The second gear 9 rotates and drives the third gear 12 to idle.

[0039] During use: the motor 25 rotates to drive the second friction wheel 4 to rotate, and the second friction wheel 4 drives the first friction wheel 2 to rotate, so that the stirring mechanism 14 rotates, driving the driving gear 15 to rotate, so that the first gear 5 rotates, and the first gear 5 drives the incomplete gear 6 to rotate. When the incomplete gear 6 is meshed with the second gear 9, it drives the second gear 9 to rotate. When the second gear 9 rotates, when the first magnet 10 is aligned with the second magnet 36, the piston rod 39 will move under the action of the magnet repulsion, and the air in the connecting tube 22 will be squeezed into the cavity 31. The air is continuously squeezed into the cavity 31, and the pressure in the cavity 31 will increase, so that the moving plug 26 is driven to move. After a period of time, the abutment column 34 abuts on the connecting ring 33. When the second gear 9 rotates to drive the third gear 12 to rotate, it can drive the threaded The column 24 rotates, thereby adjusting the position of the moving block 21 on the threaded column 24, driving the rack 19 to move, driving the fourth gear 16 to rotate, so that the worm 20 drives the worm wheel 13 to rotate, and the worm wheel 13 drives the threaded rod 17 to rotate, and the second friction wheel 4 is moved, so that the rotation speed of the first friction wheel 2 is reduced, and the rotation speed of the stirring mechanism 14 is reduced; finally, the emulsion is taken out, and when it is necessary to reset the device, the driving motor 25 rotates in the opposite direction, opens the valve 32, and the two one-way bearings are in a locked state. Under the action of the pulley 8 and the belt 41, the threaded column 24 is driven to rotate, thereby adjusting the position of the moving block 21 on the threaded column 24, driving the rack 19 to move, and driving the fourth gear 16 to rotate, so that the worm 20 drives the worm wheel 13 to rotate, and the worm wheel 13 drives the threaded rod 17 to rotate, and the second friction wheel 4 is reset.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A polyurethane emulsion preparation device, comprising a tank (1), characterized in that: The tank body (1) is rotatably connected to a stirring mechanism (14) via a bearing; The stirring mechanism (14) is fixedly connected to a first friction wheel (2), the first friction wheel (2) is provided with an inclined curved surface (3), a second friction wheel (4) is abutted on the inclined curved surface (3), the second friction wheel (4) is transmission-connected to a motor (25), the tank body (1) is fixedly connected to a support frame (30), a threaded rod (17) is rotationally connected to the support frame (30) via a bearing, the axis of the threaded rod (17) is parallel to the extension line of the abutment point of the second friction wheel (4) and the first friction wheel (2), a threaded cylinder (27) is threadedly connected to the threaded rod (17), the threaded cylinder (27) is fixedly connected to the motor (25), and the threaded rod (17) is rotated by a trigger mechanism; A positioning rod (29) is fixedly connected to the motor (25), a positioning sleeve (28) is sleeved on the positioning rod (29), and the positioning sleeve (28) is fixedly connected to the support frame (30).

2. A polyurethane emulsion preparation device according to claim 1, characterized in that: The trigger mechanism comprises a driving gear (15), the driving gear (15) being fixedly connected to the stirring mechanism (14); a rotating shaft (7) being rotatably connected to the tank body (1) via a bearing; a first gear (5) being fixedly connected to the rotating shaft (7), the first gear (5) being meshed with the driving gear (15); an incomplete gear (6) being fixedly connected to the rotating shaft (7); a supporting shaft (11) being rotatably connected to the tank body (1) via a bearing; a second gear (9) being fixedly connected to the supporting shaft (11), the second gear (9) being meshed with the incomplete gear (6); a threaded column (24) being rotatably connected to the tank body (1) via a bearing; a third gear (12) being rotatably connected to the threaded column (24) via a bearing. The third gear (12) is meshed with the second gear (9), the third gear (12) is connected to the threaded column (24) through a clamping mechanism, a moving block (21) is threadedly connected to the threaded column (24), a rack (19) is fixedly connected to the moving block (21), a fourth gear (16) is meshed with the rack (19), a worm (20) is fixedly connected to the fourth gear (16), the worm (20) is rotatably connected to the tank body (1) through a bearing, a worm wheel (13) is fixedly connected to the threaded rod (17), the worm wheel (13) is meshed with the worm (20), a limiting rod (18) is provided through the moving block (21), and the limiting rod (18) is fixedly connected to the tank body (1).

3. A polyurethane emulsion preparation device according to claim 2, characterized in that: The number of teeth of the first gear (5) is greater than the number of teeth of the driving gear (15).

4. A polyurethane emulsion preparation device according to claim 3, characterized in that: The clamping mechanism comprises a first magnet (10), the first magnet (10) is fixedly connected to the second gear (9), the tank body (1) is fixedly connected to a connecting tube (22), a piston (37) is abutted in the connecting tube (22), a piston rod (39) is fixedly connected to the piston (37), a second magnet (36) is fixedly connected to the piston rod (39), the second magnet (36) and the first magnet (10) have opposite surfaces with the same magnetic properties, an air hole (38) is provided on the connecting tube (22), a cavity (31) is provided on the threaded column (24), and the The cavity (31) is rotatably connected to a connecting tube (23) via a sealing bearing, the connecting tube (23) is communicated with the connecting tube (22), a plurality of conducting sleeves (35) are fixedly connected to the threaded column (24), the plurality of conducting sleeves (35) are all communicated with the cavity (31), a movable plug (26) is abutted in the plurality of conducting sleeves (35), a plurality of movable plugs (26) are fixedly connected to an abutting column (34), a connecting ring (33) is fixedly connected to the third gear (12) via a fixing column, the abutting column (34) moves to abut against the connecting ring (33).

5. A polyurethane emulsion preparation device according to claim 4, characterized in that: The movable plug (26) is fixedly connected to the inner wall of the connecting pipe (23) with a spring (40).

6. A polyurethane emulsion preparation device according to claim 4, characterized in that: The threaded column (24) is provided with a valve (32), and the valve (32) is communicated with the cavity (31).

7. A polyurethane emulsion preparation device according to claim 6, characterized in that: The threaded column (24) and the rotating shaft (7) are both rotatably connected with a pulley (8) via a one-way bearing, and a belt (41) is sleeved between the two pulleys (8).

8. A polyurethane emulsion preparation device according to claim 4, characterized in that: A retaining ring is fixedly connected to the inner wall of the connecting cylinder (22), and the inner diameter of the retaining ring is smaller than the diameter of the piston (37).

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