A pretreatment stirring device for polyurethane adhesive production

Abstract

The application discloses a pretreatment stirring equipment for polyurethane adhesive production. It specifically comprises a rack, and a preparation reaction kettle with an open upper end is fixedly assembled on the rack; a mixing mechanism is arranged inside the preparation reaction kettle, and a turbulence mechanism is assembled outside the preparation reaction kettle; the mixing mechanism comprises two positioning shaft seats fixedly arranged inside the preparation reaction kettle. The front turbulence mechanism is arranged, so that the raw materials can be pre-dispersed and turbulence-processed by the high-speed rotating turbulence teeth before entering the main body of the reaction kettle, the agglomeration and clumping of high-viscosity raw materials are effectively broken, the large raw materials are avoided from directly falling into the reaction kettle and being difficult to be stirred and dispersed, the raw material mixing basic effect is improved from the source, the stirring disc can make reciprocating linear motion along the threaded screw rod, the mixing teeth on the periphery of the stirring disc are matched, the whole domain dead angle-free stirring in the reaction kettle is realized, the stirring blind area problem existing in the traditional fixed stirring structure is solved, and the mixing uniformity of multi-component raw materials is greatly improved.

Description

Technical Field

[0001] This invention relates to the technical field of polyurethane adhesive production equipment, specifically a pretreatment mixing device for polyurethane adhesive production. Background Technology

[0002] Polyurethane adhesives possess numerous excellent properties such as high bonding strength, good flexibility, aging resistance, and solvent resistance, and are widely used in industries such as furniture manufacturing, packaging, construction, and automobile manufacturing. In the industrial production of polyurethane adhesives, the raw material pretreatment and mixing process is the core process that determines the quality of the finished adhesive, directly affecting the uniformity of raw material mixing, the sufficiency of reaction, and the stability of the finished colloid.

[0003] Currently, existing polyurethane adhesive pretreatment mixing equipment has a relatively simple structure, mostly relying on a single mixing structure for simple mixing of raw materials, which has obvious technical defects. First, the raw materials are directly added into the reactor for mixing, and some high-viscosity raw materials are prone to agglomeration and clumping. A single mixing is insufficient to achieve sufficient dispersion of the raw materials, resulting in poor mixing uniformity. Second, the mixing structure is mostly fixed-position mixing, with limited mixing coverage and dead zones inside the reactor, leading to uneven mixing of raw materials, which greatly affects the subsequent polymerization reaction and causes unstable viscosity and bonding performance of the finished adhesive. Third, the equipment transmission structure is simple, and the mixing speed and direction cannot be precisely controlled, resulting in poor adaptability and difficulty in meeting the pretreatment mixing requirements of polyurethane adhesives with different formulations.

[0004] Based on the shortcomings of the existing technology, there is an urgent need to design a pretreatment mixing device with optimized structure, good mixing effect, strong adaptability, and the ability to combine pre-turbulence dispersion and dynamic mixing of raw materials, so as to improve the production quality and efficiency of polyurethane adhesives. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a pretreatment mixing device for polyurethane adhesive production. Through a structural design that combines pre-turbulence dispersion with dynamic reciprocating stirring, it completely eliminates mixing dead zones, breaks up raw material agglomerates, significantly improves the uniformity of raw material mixing, and enhances the stability of equipment operation and the adaptability of formulations.

[0006] (II) Technical Solution The technical solution of the present invention to solve the above-mentioned technical problems is as follows: it includes a frame, and a preparation reaction vessel with an open top is fixedly mounted on the frame; a mixing mechanism is provided inside the preparation reaction vessel, and a turbulence-inducing mechanism is mounted on the outside of the preparation reaction vessel; The mixing mechanism includes two positioning shaft seats fixed inside the preparation reaction vessel, a threaded screw is rotatably installed between the two positioning shaft seats, a screw nut is engaged on the outside of the screw, and a stirring plate is fixedly sleeved on the outside of the screw nut; The turbulence-disrupting mechanism includes a turbulence-disrupting box fixed to the preparation reactor, a turbulence-disrupting shaft rotatably mounted inside the turbulence-disrupting box, and several turbulence-disrupting teeth uniformly arranged around the outer periphery of the turbulence-disrupting shaft.

[0007] The beneficial effects of this invention are as follows: By setting a turbulence-inducing mechanism on the outside of the preparation reactor and a screw-driven mixing mechanism inside, a dual-layer mixing system of "external pre-turbulence + internal dynamic stirring" is constructed. This breaks through the structural limitations of traditional single fixed-point stirring. The raw materials can be pre-dispersed by the turbulence-inducing mechanism first, and then the internal movable stirring plate can complete the deep mixing. This effectively solves the problems of easy agglomeration and insufficient stirring of high-viscosity polyurethane raw materials, and structurally improves the overall quality and efficiency of raw material pretreatment stirring.

[0008] This invention features a pre-flow disturbance mechanism that pre-disperses and turbulents the raw materials before they enter the main body of the reactor. This effectively breaks up agglomerates of high-viscosity raw materials, preventing large pieces of raw materials from falling directly into the reactor and becoming difficult to stir and disperse, thus improving the basic mixing effect of raw materials from the source.

[0009] A further beneficial effect is that the present invention adopts a movable stirring structure driven by a screw and nut, and the stirring disc can reciprocate linearly along the screw. In conjunction with the mixing teeth on the outer periphery of the stirring disc, it can achieve stirring without dead angles throughout the entire interior of the reactor, completely solving the problem of stirring blind spots in traditional fixed stirring structures and greatly improving the mixing uniformity of multi-component raw materials.

[0010] Furthermore, this invention is equipped with an independent transmission mechanism. Through the cooperation of a forward and reverse motor, a reducer, and a synchronous transmission component, the rotation direction and speed of the threaded screw can be precisely controlled to achieve reciprocating uniform speed movement of the mixing disc. This adapts to the pretreatment mixing requirements of polyurethane adhesives with different viscosities and formulations, making the equipment highly adaptable.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, the spoiler box has a rectangular box structure with a spoiler cavity formed inside. The spoiler box has an opening at the top, and the edge of the opening is bent to form an abutment plate. The abutment plate is arranged adjacent to the spoiler shaft, and the edge of the abutment plate is rounded.

[0013] The beneficial effects of adopting the above-mentioned further solution are that the rectangular box can be regularly formed into an independent turbulence cavity, providing a stable working space for the pre-dispersal of raw materials; the abutment plate with bent edges at the opening and adjacent to the turbulence shaft can form a material shearing and mating structure, enhancing the dispersal effect of agglomerated materials. At the same time, the rounded corner treatment of the abutment plate can completely avoid sharp structures from sticking to the walls and accumulating material, reducing material residue and waste, and preventing material jamming and accumulation, ensuring the continuous and stable operation of the turbulence mechanism and improving the uniformity of raw material premixing.

[0014] Furthermore, the inside of the turbulence box is inclined with a feeding ramp, and the bottom of the turbulence box has a through-hole for feeding, which is connected to the inside of the preparation reaction vessel.

[0015] The beneficial effect of adopting the above-mentioned further solution is that, by setting an inclined feeding ramp inside the turbulence box and opening a feeding port at the bottom connecting to the preparation reactor, the material, after being turbulent and dispersed, can slide down quickly and smoothly by gravity, effectively avoiding material accumulation and blockage inside the turbulence box. This achieves automatic and continuous feeding of premixed materials, ensuring seamless connection between the pretreatment process and the in-reactor mixing process, improving the overall operational continuity and production efficiency of the equipment, while minimizing material residue and increasing raw material utilization.

[0016] Furthermore, a drive motor is fixedly installed on the outside of the spoiler box, and the output shaft of the drive motor passes through the spoiler box body and is fixedly connected to the end of the spoiler shaft.

[0017] The advantages of adopting the above-mentioned further solution are that by directly fixing the external drive motor to the turbulence shaft, the transmission structure is simple and compact, and the power transmission is direct and lossless. It can provide stable and sufficient power for the high-speed rotation of the turbulence shaft and turbulence teeth, ensuring that the shearing and dispersing effect on polyurethane agglomerated and clumped raw materials meets the standards. At the same time, the external motor structure facilitates later inspection, maintenance and heat dissipation, avoids dust and material accumulation inside the motor and damage, and extends the service life of the equipment.

[0018] Furthermore, a plurality of mixing teeth are uniformly fixed around the outer periphery of the mixing disc, and the plurality of mixing teeth are arranged radially along the mixing disc.

[0019] The beneficial effect of adopting the above-mentioned further solution is that, according to this claim, the mixing teeth arranged radially on the outer periphery of the mixing plate, compared with ordinary smooth mixing plates, can form multiple mixing actions of shearing, tearing, and kneading on the high-viscosity polyurethane raw materials in the reactor during reciprocating movement. This can refine material particles, break up material stratification, significantly expand the mixing range, eliminate mixing blind spots, and allow for more uniform mixing of various raw material components, effectively improving the pretreatment mixing quality of adhesive raw materials and ensuring the stability of the subsequent finished product performance.

[0020] Furthermore, a transmission mechanism is mounted on the frame, and the transmission mechanism is connected to the threaded screw. The transmission mechanism includes a forward and reverse motor and a reducer fixed on the frame. A transmission wheel is fixedly installed at the output end of the forward and reverse motor, and a mating wheel is fixedly installed at the input end of the reducer. A transmission belt is tensioned between the transmission wheel and the mating wheel, and the output end of the reducer is fixedly connected to the end of the threaded screw.

[0021] The beneficial effects of adopting the above-mentioned further solution are that, through the cooperation of the reversible motor, synchronous transmission components, and reducer, controllable forward and reverse power is provided to the threaded screw. The reducer can reduce speed and increase torque, thereby improving the transmission torque and ensuring stable operation of the threaded screw even when bearing the resistance of high-viscosity materials; the belt drive structure has a buffering and shock absorption effect, which can reduce the operating noise and vibration of the equipment, while realizing the reciprocating uniform speed movement of the mixing disc, precisely controlling the mixing range and mixing rhythm, and adapting to the fine mixing requirements of polyurethane adhesive raw materials.

[0022] Furthermore, both the transmission wheel and the mating wheel are synchronous pulleys, and the transmission belt is a synchronous belt adapted to the synchronous pulley.

[0023] The beneficial effects of adopting the above-mentioned further solution are that, according to this claim, the transmission wheel, mating wheel, and transmission belt are defined as a synchronous transmission structure. Compared with ordinary belt drives, the synchronous wheel and synchronous belt can achieve zero-slip precision transmission, resulting in high transmission accuracy and stable power transmission. It can strictly ensure that the speed of the forward and reverse motor matches the rotational speed of the lead screw, avoiding problems such as stirring displacement deviation and uneven stirring caused by transmission slippage. It precisely controls the reciprocating stroke and speed of the stirring disc, significantly improving the equipment's operational stability and stirring accuracy, and adapting to the pretreatment requirements of high-precision adhesive production.

[0024] Furthermore, the positioning shaft seat is detachably and fixedly connected to the inner wall of the preparation reactor, and the two ends of the threaded screw are rotatably engaged with the positioning shaft seat through bearings.

[0025] The beneficial effects of adopting the above-mentioned further solution are that, as defined in this claim, the positioning shaft seat is detachable and the threaded screw is engaged with the bearing rotation mechanism. The detachable positioning shaft seat facilitates quick assembly and disassembly of core mixing components such as the threaded screw and mixing disc by operators, making daily cleaning, material removal, and parts replacement and maintenance easier and significantly reducing the difficulty and cost of equipment operation and maintenance. Simultaneously, the bearing rotation mechanism reduces the frictional resistance of the screw rotation, resulting in smoother and quieter operation, reduced component wear, improved equipment stability and service life, and ensuring long-term continuous production operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall installation structure of the present invention; Figure 2This is a schematic diagram of the installation structure of the turbulence-disrupting mechanism of the present invention on the preparation reactor; Figure 3 This is a schematic cross-sectional view of the turbulence-disrupting mechanism of the present invention; Figure 4 This is a schematic diagram of the overall structure of the hybrid mechanism of the present invention; Figure 5 This is a schematic cross-sectional view of the mixing disc and threaded screw assembly within the mixing mechanism of the present invention.

[0027] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Frame; 2. Preparation reactor; 3. Turbulence mechanism; 31. Turbulence box; 32. Turbulence shaft; 33. Turbulence teeth; 34. Abutment plate; 35. Feeding ramp; 36. Drive motor; 4. Mixing mechanism; 41. Positioning shaft seat; 42. Threaded screw; 43. Screw nut; 44. Stirring disc; 45. Mixing teeth; 5. Transmission mechanism; 51. Forward and reverse motor; 52. Transmission wheel; 53. Transmission belt; 54. Reducer; 55. Fitting wheel. Detailed Implementation

[0028] 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.

[0029] First embodiment: This invention includes, for example Figure 1-5 As shown, a pretreatment mixing device for polyurethane adhesive production includes a frame 1. A preparation reactor 2 with an open top is fixedly mounted on the frame 1. The preparation reactor 2 is the core cavity structure for pretreatment mixing of polyurethane adhesive raw materials, used to contain the raw materials and complete the mixing operation. The preparation reactor 2 has a mixing mechanism 4 for deep mixing of materials inside, and a turbulence mechanism 3 for pre-dispersing and pre-treating the raw materials on the outside. Through this dual structure of turbulence pre-mixing and dynamic reciprocating stirring, the material mixing effect is improved.

[0030] Second embodiment: In further embodiments of the present invention, as shown in the examples... Figure 4-5As shown, the mixing mechanism 4 includes two detachable positioning shaft seats 41 fixedly installed on the inner wall of the preparation reactor 2. The two positioning shaft seats 41 are symmetrically arranged. The two ends of the threaded screw 42 are rotatably engaged with the two positioning shaft seats 41 through bearings, ensuring that the threaded screw 42 can rotate smoothly. A screw nut 43 is meshed on the outside of the threaded screw 42. The screw nut 43 can perform linear reciprocating motion with the forward and reverse rotation of the threaded screw 42. A stirring disc 44 is fixedly sleeved on the outside of the screw nut 43. Several radially arranged mixing teeth 45 are evenly fixed around the outer circumference of the stirring disc 44. While the stirring disc 44 moves with the screw nut 43, it can perform all-round stirring and dispersing of the materials inside the reactor. The mixing teeth 45 can further refine the materials and improve the mixing uniformity. The positioning shaft seats 41 adopt a detachable connection method, which facilitates the disassembly, cleaning, maintenance and replacement of components such as the threaded screw 42 and the stirring disc 44 by the staff.

[0031] Third embodiment: In a further embodiment of the present invention, as shown in the examples... Figure 2-3 As shown, the turbulence-inducing mechanism 3 includes a turbulence-inducing box 31 fixedly installed on the upper end of the preparation reactor 2. The turbulence-inducing box 31 has a rectangular box structure with a sealed turbulence-inducing cavity inside, and an opening at the upper end for feeding in production raw materials. A drive motor 36 is fixedly installed on the outside of the turbulence-inducing box 31. The output shaft of the drive motor 36 passes through the box and is fixedly connected to a turbulence-inducing shaft 32. The turbulence-inducing shaft 32 is rotatably installed inside the turbulence-inducing box 31, and several turbulence-inducing teeth 33 are evenly arranged around the outer periphery of the turbulence-inducing shaft 32. After the raw materials are fed into the turbulence-inducing box 31, the drive motor 36 is started to drive the turbulence-inducing shaft 32 to rotate at high speed, and the turbulence-inducing teeth 33 perform shearing and breaking up the agglomerated and clumped polyurethane raw materials for pretreatment.

[0032] In this embodiment, it is further preferred that the upper opening edge of the turbulence box 31 is bent into an abutment plate 34, which is arranged adjacent to the turbulence shaft 32, and the edge of the abutment plate 34 is rounded to effectively prevent the raw material from accumulating on the edge of the box. At the same time, it forms a relative shear structure with the turbulence teeth 33 to improve the material dispersion effect. The turbulence box 31 is inclinedly provided with a discharge ramp 35, and the bottom is opened through a discharge port, which is connected to the interior of the preparation reactor 2. The pretreated material can smoothly slide down the discharge ramp 35 into the interior of the preparation reactor 2 without material residue, ensuring full utilization of the raw material.

[0033] Fourth embodiment: More preferably, as in the embodiments Figure 1-2As shown, a transmission mechanism 5 connected to the threaded screw 42 is mounted on the frame 1. The transmission mechanism 5 includes a forward / reverse motor 51 and a reducer 54 fixed on the frame 1. A transmission wheel 52 is fixedly installed at the output end of the forward / reverse motor 51, and a mating wheel 55 is fixedly installed at the input end of the reducer 54. A transmission belt 53 is tensioned and sleeved between the transmission wheel 52 and the mating wheel 55. The output end of the reducer 54 is fixedly connected to the end of the threaded screw 42. Both the transmission wheel 52 and the mating wheel 55 are synchronous pulleys, and the transmission belt 53 is a compatible synchronous belt. The synchronous transmission structure provides precise transmission without slippage and can stably transmit power.

[0034] Working principle: Step 1: The staff put all kinds of raw materials required for the production of polyurethane adhesive into the equipment through the opening at the top of the turbulence box 31, and started the drive motor 36. The drive motor 36 drives the turbulence shaft 32 and the turbulence teeth 33 on the outer periphery to rotate at high speed, and shears, disperses and pre-stirs the raw materials. The dispersed material falls into the preparation reaction vessel 2 through the bottom discharge port along the discharge slope 35. Step 2: Then, the forward and reverse motor 51 is started. The forward and reverse motor 51 drives the transmission wheel 52 to rotate, which in turn drives the mating wheel 55 to rotate synchronously through the transmission belt 53. After being reduced in speed and increased in torque by the reducer 54, the threaded screw 42 is driven to rotate at a uniform speed. During the rotation of the threaded screw 42, the screw nut 43 is driven to make reciprocating linear motion, which in turn drives the stirring disc 44 and the mixing teeth 45 on the outer periphery to move back and forth inside the preparation reaction vessel 2. This allows for all-round, dynamic stirring and mixing of the falling materials, completely solving the problems of dead corners and material stratification and agglomeration that exist in traditional fixed-point stirring, and completing the efficient pretreatment stirring operation of polyurethane adhesive raw materials.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pretreatment mixing device for polyurethane adhesive production, comprising a frame (1), characterized in that: The frame (1) is fixedly equipped with a preparation reaction vessel (2) with an opening at the top; the preparation reaction vessel (2) is provided with a mixing mechanism (4) inside, and a turbulence mechanism (3) is provided on the outside of the preparation reaction vessel (2). The mixing mechanism (4) includes two positioning shaft seats (41) fixed inside the preparation reactor (2), a threaded screw (42) is rotatably installed between the two positioning shaft seats (41), a screw nut (43) is meshed on the outside of the screw (42), and a stirring plate (44) is fixedly sleeved on the outside of the screw nut (43). The turbulence mechanism (3) includes a turbulence box (31) fixed on the preparation reactor (2), a turbulence shaft (32) is rotatably installed inside the turbulence box (31), and a number of turbulence teeth (33) are uniformly arranged around the outer periphery of the turbulence shaft (32).

2. The pretreatment mixing equipment for polyurethane adhesive production according to claim 1, characterized in that: The turbulence box (31) is a rectangular box structure with a turbulence cavity inside. The upper end of the turbulence box (31) is open, and the edge of the opening is bent to form an abutment plate (34). The abutment plate (34) is arranged adjacent to the turbulence shaft (32), and the edge of the abutment plate (34) is rounded.

3. The pretreatment mixing equipment for polyurethane adhesive production according to claim 1, characterized in that: The turbulence box (31) is provided with a feeding ramp (35) at an incline. The bottom of the turbulence box (31) is provided with a feeding port, which is connected to the interior of the preparation reactor (2) through the feeding port.

4. The pretreatment mixing equipment for polyurethane adhesive production according to claim 1, characterized in that: A drive motor (36) is fixedly installed on the outside of the spoiler box (31). The output shaft of the drive motor (36) passes through the spoiler box (31) and is fixedly connected to the end of the spoiler shaft (32).

5. The pretreatment mixing equipment for polyurethane adhesive production according to claim 1, characterized in that: The mixing plate (44) is uniformly surrounded by a number of mixing teeth (45), and the mixing teeth (45) are arranged radially along the mixing plate (44).

6. The pretreatment mixing equipment for polyurethane adhesive production according to claim 1, characterized in that: The frame (1) is equipped with a transmission mechanism (5), which is connected to the threaded screw (42). The transmission mechanism (5) includes a reversible motor (51) and a reducer (54) fixed on the frame (1). A transmission wheel (52) is fixedly installed at the output end of the reversible motor (51), and a mating wheel (55) is fixedly installed at the input end of the reducer (54). A transmission belt (53) is tensioned between the transmission wheel (52) and the mating wheel (55). The output end of the reducer (54) is fixedly connected to the end of the threaded screw (42).

7. The pretreatment mixing equipment for polyurethane adhesive production according to claim 6, characterized in that: The transmission wheel (52) and the mating wheel (55) are both synchronous pulley structures, and the transmission belt (53) is a synchronous belt adapted to the synchronous pulley.

8. The pretreatment mixing equipment for polyurethane adhesive production according to claim 1, characterized in that: The positioning shaft seat (41) is detachably and fixedly connected to the inner wall of the preparation reactor (2), and the two ends of the threaded screw (42) are rotatably engaged with the positioning shaft seat (41) through bearings.

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