Efficient screw conveying mechanism in PMMA extrusion equipment

Abstract

The utility model discloses an efficient screw conveying mechanism in PMMA (polymethyl methacrylate) extrusion equipment, which relates to the technical field of screw conveying mechanisms and comprises a mounting plate, two groups of stabilizing seats are fixedly mounted at the upper end of the mounting plate, a conveying structure is arranged above the mounting plate, an adjusting mechanism is arranged at the upper end of the mounting plate, and the adjusting mechanism is connected with the stabilizing seats. The adjusting mechanism comprises a stepping motor. According to the utility model, the shearing force and the friction force borne by the material at the gap can be kept in a proper range, when some PMMA materials sensitive to the shearing force are treated, the gap can be properly enlarged, the shearing force borne by the material can be properly reduced, and molecular chain breakage and influence on the material performance caused by excessive shearing of the material can be prevented; gaps can be properly reduced, friction force borne by materials is increased, conveying of the materials is promoted, and meanwhile the situation that the production efficiency and the product quality are affected due to material accumulation caused by too large gaps is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw conveying mechanism technical field especially relates to a kind of high-efficiency screw conveying mechanism in PMMA extrusion equipment. BACKGROUND

[0002] PMMA (polymethyl methacrylate) as an important thermoplastic, with good optical performance, weather resistance, mechanical properties, etc., in building, automobile, electronics, optics and many other fields have a wide range of applications. With the increasing demand of various industries for PMMA products, higher requirements for production efficiency and product quality of PMMA extrusion equipment are put forward.

[0003] But in the prior art, in PMMA extrusion production, the conveying speed and other parameters need to be adjusted according to different product requirements and process conditions, because the intermediate gap in the traditional equipment cannot be adjusted, when the conveying speed is increased, the shear force and friction force of the material at the gap will change, and the material will be over-sheared or the heat generated by friction will be too large, which will affect the physical properties of the material, and even cause the material to degrade; When the conveying speed is reduced, material accumulation will occur, which will also affect the conveying effect and extrusion quality. SUMMARY

[0004] The utility model aims at solving the problems in the prior art and provides a kind of high-efficiency screw conveying mechanism in PMMA extrusion equipment.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: a kind of high-efficiency screw conveying mechanism in PMMA extrusion equipment, including mounting plate, the upper end of the mounting plate is fixedly installed with two groups of stable seat, the upper of the mounting plate is provided with conveying structure, the upper end of the mounting plate is provided with adjusting mechanism, the adjusting mechanism includes stepper motor, one end of one group of the stable seat is rotatably installed with threaded long barrel, the outer wall of the threaded long barrel is fixedly installed with a gear, the outer wall of the output end of the stepper motor is fixedly installed with a second gear, the upper end of the mounting plate is provided with bracket seat, the inside of the threaded long barrel is connected with threaded rod in screw thread.

[0006] Preferably, the upper end of the mounting plate is fixedly installed with bearing seat, two groups of guide grooves are formed in the upper end of the mounting plate, and a long block is slidably installed in the inside of the two groups of guide grooves.

[0007] Preferably, the upper end of the mounting plate is fixedly installed with stable plate, the lower end of the stepper motor is fixed with the upper end of the mounting plate, two groups of guide rods are inserted through the bracket seat, and a part of the threaded long barrel is rotatably installed in the inside of the bearing seat.

[0008] Preferably, the upper ends of the two groups of long blocks are fixed with the lower ends of the support seats, one end of the two groups of guide rods is fixed with one end of one group of the stabilizing seats, and the other end of the two groups of guide rods is fixed with one end of the stabilizing plate.

[0009] Preferably, the conveying structure comprises a conveying cylinder and a variable speed motor, the inside of the conveying cylinder is provided with a screw conveying disc, and the outer wall of the screw conveying disc is fixedly installed with a circular baffle.

[0010] Preferably, the outer walls of the two groups of conveying cylinders are fixed with the inner walls of the two groups of stabilizing seats, the inner wall of the circular baffle is in contact with the inner wall of the conveying cylinder, one end of the screw conveying disc is fixed with the output end of the variable speed motor, and the lower end of the variable speed motor is fixed with the upper end of the support seat.

[0011] Preferably, the upper end opening of the conveying cylinder is fixedly installed with a feeding hopper, and the two protruding parts at the lower end of the feeding hopper are fixed with the upper end of the mounting plate.

[0012] Compared with the prior art, the utility model has the advantages and positive effects that:

[0013] 1、In the utility model, through setting adjusting mechanism, through a series of mechanical transmission and structure cooperation, the position of screw conveying disc can be adjusted accurately, thereby the gap between extrusion equipment and conveying structure can be adjusted accurately, the shear force and friction force that material receives at the gap can be kept in suitable range, when processing some PMMA material sensitive to shear force, the gap can be increased appropriately, the shear force that material receives is reduced, material is prevented from excessive shearing and causes molecular chain rupture, the performance of material is influenced, when the flowability of material is poor, the gap can be reduced appropriately, the friction force that material receives is increased, the conveying of material is promoted, meanwhile, material accumulation caused by too large gap is avoided, production efficiency and product quality are influenced.

[0014] 2、In the utility model, through setting conveying structure, starting variable speed motor, variable speed motor can adjust output rotating speed accurately and stably according to different production demands, the output end is closely connected with screw conveying disc, when variable speed motor operates, the output shaft drives screw conveying disc to rotate efficiently in the inside of conveying cylinder at set rotating speed, the structure design of screw conveying disc fully considers the characteristics of PMMA material, the parameters such as thread shape, pitch and blade angle on its surface are calculated and optimized carefully, in the rotating process, screw conveying disc pushes PMMA material along the axial direction of conveying cylinder through the propelling action of thread, this conveying mode can effectively utilize the friction force between materials and the thrust of screw, realizes the stable and efficient conveying of PMMA material, provides solid guarantee for conveying PMMA material to extrusion equipment smoothly. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A three-dimensional structure schematic diagram of the high-efficiency screw conveying mechanism in the PMMA extrusion equipment is provided for the utility model.

[0016] Figure 2 A partial three-dimensional view of the high-efficiency screw conveying mechanism in the PMMA extrusion equipment is provided for the utility model.

[0017] Figure 3 A top view of the partial conveying structure of the high-efficiency screw conveying mechanism in the PMMA extrusion equipment is provided for the utility model.

[0018] Figure 4 A structure schematic diagram of the conveying structure and the adjusting mechanism of the high-efficiency screw conveying mechanism in the PMMA extrusion equipment is provided for the utility model.

[0019] Figure 5 A structure schematic diagram of the screw conveying disc of the high-efficiency screw conveying mechanism in the PMMA extrusion equipment is provided for the utility model.

[0020] Legend: 1, mounting plate; 11, stabilizing seat; 12, feeding hopper; 2, conveying structure; 21, conveying cylinder; 22, screw conveying disc; 23, round baffle; 24, variable speed motor; 3, adjusting mechanism; 31, threaded long cylinder; 32, stepping motor; 33, No. 1 gear; 34, No. 2 gear; 35, bearing seat; 36, support seat; 37, guide groove; 38, threaded rod; 39, long block; 310, guide rod; 311, stabilizing plate. DETAILED DESCRIPTION

[0021] In order to make the above objects, features and advantages of the utility model more clearly understood, the utility model will be further described below in combination with the drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the utility model, however, the utility model can also be implemented in other ways different from the description herein, therefore, the utility model is not limited to the specific embodiments disclosed in the following description.

[0023] Embodiment one: as Figure 1 - Figure 5The utility model provides a kind of high-efficiency screw conveying mechanism in PMMA extrusion equipment, including mounting plate 1, the upper end of mounting plate 1 is fixedly installed with two groups of stable seat 11, the upper of mounting plate 1 is provided with conveying structure 2, the upper end of mounting plate 1 is provided with adjusting mechanism 3, adjusting mechanism 3 includes stepper motor 32, one end of one group of stable seat 11 is penetrated and is rotatably installed with threaded long barrel 31, threaded long barrel 31 is fixedly installed with one gear 33 on outer wall, the outer wall of stepper motor 32 output end is fixedly installed with second gear 34, the upper end of mounting plate 1 is provided with bracket seat 36, threaded long barrel 31 is screw-threadedly connected with threaded rod 38 in the inside, the upper end of mounting plate 1 is fixedly installed with bearing seat 35, the upper end of mounting plate 1 is opened with two groups of guide slot 37, the inside of two groups of guide slot 37 is slidably installed with long block 39, the upper end of mounting plate 1 is fixedly installed with stable plate 311, the lower end of stepper motor 32 is fixed with the upper end of mounting plate 1, two groups of guide rods 310 are inserted with the penetration of bracket seat 36, a part of threaded long barrel 31 is rotatably installed in the inside of bearing seat 35, the upper end of two groups of long blocks 39 is fixed with the lower end of bracket seat 36, one end of two groups of guide rods 310 is fixed with one end of one group of stable seat 11, the other end of two groups of guide rods 310 is fixed with one end of stable plate 311.

[0024] The specific settings and effects of the present embodiment are as follows. By starting the stepper motor 32, the output end of the stepper motor 32 can stably and accurately drive the second gear 34 to rotate by virtue of its high-precision rotation speed control characteristics. The second gear 34 is in close engagement with the first gear 33, and the gear ratio of the two is carefully designed to ensure that the torque can be effectively output and the rotation speed can be reasonably matched during power transmission. Therefore, when the second gear 34 rotates, the first gear 33 stably rotates, thereby driving the threaded long barrel 31 connected thereto to rotate. The threaded long barrel 31 rotates inside the bearing seat 35 and one of the stable seats 11, and these two components provide stable support for the threaded long barrel 31, so that it does not shake or deviate during rotation, ensuring the stability and accuracy of transmission. Meanwhile, the threaded long barrel 31 is connected with the threaded rod 38 through threads. When the threaded long barrel 31 rotates, it will rotate on the outer wall of the threaded rod 38 due to its unique thread structure. It is worth noting that the threaded rod 38 is fixedly connected with the bracket seat 36, and the bracket seat 36 is limited to the upper end of the mounting plate 1 through the two sets of long blocks 39 and the two sets of guide grooves 37. This limiting structure is designed ingeniously, and the two sets of long blocks 39 and the two sets of guide grooves 37 are in close cooperation. The long blocks 39 can only slide in a specific direction inside the guide grooves 37, which limits the freedom of movement of the bracket seat 36 in the horizontal direction, so that it can only move left and right in the horizontal direction. The fixation of the threaded rod 38 makes the threaded rod 38 move left and right inside the threaded long barrel 31 according to the screw transmission principle when the threaded long barrel 31 rotates. In this movement process, the threaded long barrel 31 drives the bracket seat 36 to move together due to the fixed relationship between the threaded rod 38 and the bracket seat 36. As a key connecting component, the bracket seat 36 not only connects the threaded rod 38, but also is installed with the variable-speed motor 24 and the two sets of long blocks 39. Therefore, when the bracket seat 36 moves, the variable-speed motor 24 also moves. The variable-speed motor 24 is connected with the screw conveyor disc 22, and it can flexibly adjust the output rotation speed according to different production needs, thereby driving the screw conveyor disc 22 to move left and right inside the conveying cylinder 21. At the same time, the two sets of long blocks 39 slide inside the two sets of guide grooves 37, further ensuring the stability and accuracy of the entire movement process. Through a series of mechanical transmission and structural cooperation, the position of the screw conveyor disc 22 can be accurately adjusted, thereby accurately adjusting the gap between the extrusion equipment and the conveying structure 2, so that the shear force and friction force acting on the material at the gap can be maintained within a suitable range. When processing some PMMA materials sensitive to shear force, the gap can be appropriately increased to reduce the shear force acting on the material and prevent the molecular chain from being broken due to excessive shearing, thereby affecting the material performance. When the flowability of the material is poor, the gap can be appropriately reduced to increase the friction force acting on the material, promote the conveying of the material, and at the same time avoid material accumulation due to excessive gap, thereby affecting the production efficiency and product quality.

[0025] With the cooperation of the two groups of long blocks 39 and the two groups of guide grooves 37, the cooperation is like the guide rail and the slider in the precision instrument, when the long blocks 39 slide in the guide grooves 37, the gap between the two is carefully designed and processed, which can not only ensure the smoothness of the long blocks 39 sliding, but also provide sufficient support force and guiding accuracy, which not only can effectively reduce the vibration and noise caused by mechanical movement, but also can greatly improve the stability and reliability of the whole adjusting mechanism 3;

[0026] When the support seat 36 moves, the support seat 36 will slide on the outer wall of the two groups of guide rods 310, the two groups of guide rods 310 are arranged in parallel and tightly cooperate with the corresponding sliding holes on the support seat 36, the guide rods 310 play a good guiding role on the support seat 36, further guaranteeing the straightness and stability of the support seat 36 in the moving process.

[0027] Embodiment two: as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , the conveying structure 2 includes a conveying cylinder 21 and a variable speed motor 24, the inside of the conveying cylinder 21 is provided with a screw conveying disc 22, the outer wall of the screw conveying disc 22 is fixedly installed with a circular baffle 23, the outer wall of the two groups of conveying cylinders 21 is fixed with the inner wall of the two groups of stable seats 11, the inner wall of the circular baffle 23 is in contact with the inner wall of the conveying cylinder 21, one end of the screw conveying disc 22 is fixed with the output end of the variable speed motor 24, the lower end of the variable speed motor 24 is fixed with the upper end of the support seat 36, the upper end opening of the conveying cylinder 21 is fixedly installed with a feeding hopper 12, the two protruding parts at the lower end of the feeding hopper 12 are fixed with the upper end of the mounting plate 1;

[0028] The stable seat 11 can support the conveying cylinder 21, and the setting of the feeding hopper 12 can store the PMMA material, which is convenient for the PMMA material to fall into the inside of the conveying cylinder 21 for conveying.

[0029] The effect achieved by the whole embodiment is that by starting the variable speed motor 24, the variable speed motor 24 can accurately and smoothly adjust the output speed according to different production needs by virtue of its excellent speed regulation performance, and the output end is closely connected with the screw conveying disc 22. When the variable speed motor 24 operates, the output shaft drives the screw conveying disc 22 to rotate efficiently in the inside of the conveying cylinder 21 at a set speed. The structure design of the screw conveying disc 22 fully considers the characteristics of PMMA material, and the parameters such as the thread shape, pitch and blade angle on the surface of the screw conveying disc 22 are carefully calculated and optimized. In the rotating process, the screw conveying disc 22 pushes the PMMA material along the axial direction of the conveying cylinder 21 through the pushing action of the thread, which can effectively utilize the friction between the materials and the thrust of the screw to realize stable and efficient conveying of the PMMA material, and provides a solid guarantee for smoothly conveying the PMMA material to the extrusion equipment.

[0030] By fixing the circular baffle 23 on the outer wall of the screw conveying disc 22 and rotating the circular baffle 23 in the inside of the conveying cylinder 21, the stability of the whole conveying structure 2 is greatly enhanced. The circular baffle 23 and the screw conveying disc 22 are connected in a high-strength manner, so that they always rotate synchronously during the operation of the equipment. When the screw conveying disc 22 starts to rotate under the driving of the variable speed motor 24, it will drive the circular baffle 23 to rotate in the inside of the conveying cylinder 21 through the close connection. The diameter of the circular baffle 23 and the inner diameter of the conveying cylinder 21 maintain a precise fitting gap. During rotation, the circular baffle 23 can evenly share the radial force borne by the screw conveying disc 22. From the perspective of mechanics, the circular baffle 23 acts as a stable support ring, providing additional radial support for the screw conveying disc 22 during rotation, effectively reducing the radial displacement and vibration of the screw conveying disc 22 caused by centrifugal force and other factors during high-speed rotation. This supporting effect not only prolongs the service life of the screw conveying disc 22, but also ensures the stability of the material during conveying, avoids the problems of poor material conveying or blockage caused by the shaking of the screw conveying disc 22, and further improves the efficiency and quality of PMMA material conveying.

[0031] The method for using and the working principle of the device are as follows: firstly, according to the situation, the screw conveying disc 22 is adjusted, the step motor 32 is started, the step motor 32 drives the threaded long barrel 31 to rotate through the cooperation of the second gear 34 and the first gear 33, the threaded long barrel 31 is inside the bearing seat 35 and one group of the stabilizing seat 11, meanwhile, the threaded long barrel 31 is threaded on the outer wall of the threaded rod 38, so that the threaded rod 38 moves left and right in the threaded long barrel 31, the threaded rod 38 drives the screw conveying disc 22 to move through the support seat 36 and the variable speed motor 24, so that the screw conveying disc 22 moves in the conveying barrel 21, the gap between the extrusion equipment and the conveying structure 2 can be accurately adjusted, then, the PMMA material is poured into the inside of the feeding hopper 12, the PMMA material falls into the inside of the conveying barrel 21, finally, the variable speed motor 24 is started, the variable speed motor 24 drives the screw conveying disc 22 to rotate in the inside of the conveying barrel 21, and the PMMA material entering the inside of the conveying barrel 21 is conveyed.

[0032] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields. However, any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments still fall within the protection scope of the present application.

Claims

1. A high efficiency screw conveying mechanism in PMMA extrusion equipment comprising a mounting plate (1) characterized in that: The upper end of the mounting plate (1) is fixedly provided with two groups of stable seats (11), the upper end of the mounting plate (1) is provided with a conveying structure (2), the upper end of the mounting plate (1) is provided with an adjusting mechanism (3), the adjusting mechanism (3) comprises a stepping motor (32), one end of one group of stable seats (11) penetrates and is rotatably provided with a threaded long barrel (31), the outer wall of the threaded long barrel (31) is fixedly provided with a first gear (33), the outer wall of the output end of the stepping motor (32) is fixedly provided with a second gear (34), the upper end of the mounting plate (1) is provided with a support seat (36), the inside of the threaded long barrel (31) is threadedly connected with a threaded rod (38).

2. A high efficient screw conveying mechanism in PMMA extrusion equipment according to claim 1, characterized in that: The upper end of the mounting plate (1) is fixedly provided with a bearing seat (35), the upper end of the mounting plate (1) is provided with two groups of guide grooves (37), the inside of the two groups of guide grooves (37) is slidably provided with a long block (39).

3. A high efficient screw conveying mechanism in PMMA extrusion equipment according to claim 2, characterized in that: The upper end of the mounting plate (1) is fixedly provided with a stable plate (311), the lower end of the stepping motor (32) is fixed to the upper end of the mounting plate (1), the support seat (36) penetrates and is inserted with two groups of guide rods (310), a part of the threaded long barrel (31) is rotatably installed in the inside of the bearing seat (35).

4. A high efficient screw conveying mechanism in PMMA extrusion equipment according to claim 3, characterized in that: The upper end of the two groups of long blocks (39) is fixed to the lower end of the support seat (36), one end of the two groups of guide rods (310) is fixed to one end of one group of stable seats (11), the other end of the two groups of guide rods (310) is fixed to one end of the stable plate (311).

5. A high efficient screw conveying mechanism in PMMA extrusion equipment according to claim 1, characterized in that: The conveying structure (2) comprises a conveying barrel (21) and a variable speed motor (24), the inside of the conveying barrel (21) is provided with a screw conveying disc (22), the outer wall of the screw conveying disc (22) is fixedly provided with a circular baffle (23).

6. A high efficiency screw conveying mechanism in a PMMA extrusion apparatus as claimed in claim 5, wherein: The outer wall of the two groups of conveying barrels (21) is fixed to the inner wall of the two groups of stable seats (11), the inner wall of the circular baffle (23) is in contact with the inner wall of the conveying barrel (21), one end of the screw conveying disc (22) is fixed to the output end of the variable speed motor (24), the lower end of the variable speed motor (24) is fixed to the upper end of the support seat (36).

7. A high efficient screw conveying mechanism in a PMMA extrusion apparatus according to claim 5, characterized in that: The upper end of the conveying barrel (21) is fixedly provided with a feeding hopper (12), the two protruding parts at the lower end of the feeding hopper (12) are fixed to the upper end of the mounting plate (1).

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