Feeding device for polypropylene extruder

Abstract

The utility model belongs to the technical field of extruders, and discloses a feeding device for a polypropylene extruder, which comprises an extruder and a blanking box, a discharge pipe is arranged at the bottom of the blanking box, the discharge pipe is communicated with the extruder, a connecting ring rotatably connected with the discharge pipe is arranged on the inner side of the discharge pipe, and a servo motor is arranged on the outer side of the discharge pipe. The outer side of the connecting ring is sleeved with a gear ring, an output shaft of the servo motor is provided with a gear, the gear is meshed with the gear ring, a moving rod is arranged on the top face of the connecting ring, and the moving rod rotates along with the connecting ring. The servo motor drives the connecting ring to rotate, and the connecting ring drives the moving rod to stir raw materials from the inside, so that the problem of bridging of the polypropylene raw materials in the blanking box is avoided, and the blanking continuity is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of extruder technology, and specifically relates to a feeding device for a polypropylene extruder. Background Technology

[0002] Polypropylene, a semi-crystalline thermoplastic polymer made from propylene monomers through an addition polymerization reaction, is widely used in various fields due to its unique physical and chemical properties, such as its white, waxy solid form, non-toxicity, odorlessness, transparent appearance, and lightweight texture. In the polypropylene extrusion process, polypropylene granules first enter the extruder barrel and, under the combined action of the rotating screw and external heating of the barrel, gradually heat up to a molten state. Then, the molten polypropylene is extruded through the die head under the pressure of the screw, passing through a specific die to form products of various shapes. Next, the extruded products need to be cooled and shaped immediately to maintain their shape and dimensional stability.

[0003] During the feeding process of the hopper, due to the irregular shape and large size difference of polypropylene particles, they are prone to interlocking and stacking, which can easily form bridging, resulting in poor or interrupted feeding and affecting the continuity of extruded products. To address the above problems, the existing solution is to manually stir the polypropylene raw material in the hopper with a hand-held tool. Based on this, we propose a feeding device for polypropylene extruders. Utility Model Content

[0004] The purpose of this invention is to provide a feeding device for a polypropylene extruder, which aims to solve the problems existing in the prior art described in the background.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A feeding device for a polypropylene extruder includes an extruder and a feeding box. The bottom of the feeding box is provided with a discharge pipe, which is connected to the extruder. The inner side of the discharge pipe is provided with a connecting ring that is rotatably connected to it, and the outer side is provided with a servo motor. A gear ring is sleeved on the outer side of the connecting ring. The output shaft of the servo motor is provided with a gear, which meshes with the gear ring. The top surface of the connecting ring is provided with a moving rod, which rotates with the connecting ring.

[0007] Furthermore, the feeding box is equipped with a feeding adjustment mechanism, which includes an adjustment cover, a bracket, and an electric telescopic rod. The bracket includes a first support rod and a second support rod connected vertically. The first support rod is horizontally arranged inside the connecting ring, and the top of the second support rod is provided with a support plate. The electric telescopic rod is vertically arranged on the top surface of the support plate. The adjustment cover has a conical structure, and the projected area of ​​the bottom surface of the adjustment cover is the same as the area of ​​the connecting ring. The telescopic end of the electric telescopic rod is connected to the inner tip of the adjustment cover. The axes of the second support rod, the adjustment cover, and the connecting ring coincide.

[0008] Furthermore, the top surface of the support plate is provided with a guide rod, which is perpendicular to the support plate, and the adjusting sleeve is provided with a corresponding guide sleeve, with the guide rod slidingly passing through the guide sleeve.

[0009] Furthermore, multiple guide rods are evenly distributed circumferentially at a certain distance from the electric telescopic pole, with the electric telescopic pole as the center.

[0010] The present invention has the following beneficial effects.

[0011] 1. This utility model provides a feeding device for a polypropylene extruder. An anti-blocking mechanism is set in the feeding box. A servo motor drives the connecting ring to rotate through gears and a gear ring. The connecting ring drives the moving rod to stir the raw material from the inside, avoiding the problem of bridging of polypropylene raw material and ensuring the continuity of feeding.

[0012] 2. A feeding adjustment mechanism is installed inside the feeding box. The electric telescopic rod drives the adjustment cover to rise and fall, thereby adjusting the gap between the bottom edge of the adjustment cover and the connecting ring to control the feeding rate of the raw material. The feeding cover has a conical structure, which can prevent the raw material from accumulating on the surface of the feeding cover and ensure that all the raw material in the feeding box is fed into the extruder. At the same time, the feeding cover can buffer the raw material and prevent the material from directly entering the extruder and impacting the screw of the extruder during the feeding process. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the external structure of the extruder and the feeding box in this utility model.

[0014] Figure 2 This is a cross-sectional view of the anti-blocking mechanism installed inside the feed box in this utility model.

[0015] Figure 3 This is a cross-sectional view of the feeding adjustment mechanism installed inside the feeding box in this utility model.

[0016] Figure 4 yes Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0017] In the diagram: 10, Extruder; 20, Feed box; 21, Discharge pipe; 30, Anti-blocking mechanism; 31, Connecting ring; 32, Moving rod; 33, Gear ring; 34, Gear; 35, Servo motor; 40, Feed adjustment mechanism; 41, Support; 411, First support rod; 412, Second support rod; 413, Support plate; 42, Electric telescopic rod; 43, Adjustment cover; 431, Guide sleeve; 44, Guide rod; 45, Third support rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] Example 1

[0020] Reference Figure 1 This embodiment discloses a feeding device for a polypropylene extruder, including a feeding box 20. The top of the feeding box 20 is provided with a feeding port, and the bottom discharge pipe 21 is connected to the feeding port of a single screw extruder 10. Polypropylene raw material is introduced along the top of the feeding box 20 and introduced into the extruder 10 through the discharge pipe 21. The extruder 10 heats and melts the polypropylene raw material and then extrudes it.

[0021] Reference Figure 2 The feeding box 20 is equipped with an anti-blocking mechanism 30. The anti-blocking mechanism 30 is used to prevent excessive material accumulation in the feeding box 20, which could lead to bridging between materials and reduce the probability of poor material flow. The anti-blocking mechanism 30 includes a connecting ring 31, which is nested inside the discharge pipe 21 and rotatably connected to the discharge pipe 21. The top of the connecting ring 31 is provided with a moving rod 32, which is arranged along the inner wall of the feeding box 20. Multiple moving rods 32 are evenly distributed along the top axial direction of the connecting ring 31. A gear ring 33 is sleeved on the outside of the connecting ring 31. The feeding box 20 is provided with an annular chamber for accommodating the gear ring 33. A servo motor 35 is provided on the outside of the feeding box 20. The output end of the servo motor 35 is provided with a gear 34, which meshes with the gear ring 33 for transmission.

[0022] The power and model of the servo motor 35 can be selected from commercially available products based on the actual size and specifications of the feed box 20.

[0023] The working process of this embodiment is as follows:

[0024] Polypropylene raw material is introduced into the feed box 20. The raw material is in granular form and enters the single screw extruder 10 through the discharge pipe 21 at the bottom of the feed box 20. At the same time, the servo motor 35 meshes with the gear ring 33 through the gear 34, which drives the connecting ring 31 to rotate. The connecting ring 31 drives the moving rod 32 to move along the inner wall of the feed box 20. The moving rod 32 contacts and collides with the raw material to avoid bridging between the raw materials and ensure that the raw material is continuously fed into the extruder 10.

[0025] Example 2

[0026] This embodiment is an improvement on embodiment 1, which enables the feeding device to adjust the feeding rate.

[0027] This embodiment provides a feeding device for a polypropylene extruder, wherein the feeding box 20 is provided with a feeding adjustment mechanism 40.

[0028] Reference Figure 3 The feeding adjustment mechanism 40 includes an adjustment cover 43, a bracket 41, a guide rod 44, and an electric telescopic rod 42. The bracket 41 includes a first support rod 411 arranged horizontally inside the connecting ring 31. The first support rod 411 is arranged radially along the connecting ring 31. The end of the first support rod 411 is fixedly connected to the inner wall of the connecting ring 31. The top of the middle position of the first support rod 411 is vertically connected to a second support rod 412. The top of the second support rod 412 is located above the discharge pipe 21, and its end is vertically connected to a support plate 413. The guide rod 44 and the electric telescopic rod 42 are both arranged on the top surface of the support plate 413.

[0029] Reference Figure 4 The electric telescopic rod 42 is vertically installed at the center of the top surface of the support plate 413. Its telescopic end is provided with a third support rod 45. The adjustment cover 43 has a conical structure and a hollow structure inside. The top of the third support rod 45 is fixedly connected to the inner tip of the adjustment cover 43. The axes of the third support rod 45, the second support rod 412, the adjustment cover 43, and the axis of the connecting ring 31 coincide.

[0030] The vertical projected area of ​​the adjusting cover 43 is the same as the area of ​​the connecting ring 31.

[0031] Reference Figure 4 Guide rods 44 are spaced apart on one side of the electric telescopic rod 42. The guide rods 44 are vertically connected to the support plate 413. The inner side of the adjustment cover 43 is provided with a guide sleeve 431 in the vertical direction. The guide rods 44 are inserted into the guide sleeve 431 and the guide rods 44 and the guide sleeve 431 are slidably engaged. Multiple guide rods 44 are evenly distributed circumferentially with the electric telescopic rod 42 as the center and the distance between the electric telescopic rod 42 and the guide rods 44 as the radius.

[0032] The model of the electric telescopic rod 42 can be selected from commercially available products based on the actual dimensions of the feeding box 20 and the adjusting cover 43. Its power supply can be AC ​​power. The servo motor 35 and the electric telescopic rod 42 can be controlled by PLC, which are all existing technologies and will not be described in detail here.

[0033] The working principle of this embodiment follows that of Embodiment 1, and is specifically described as follows:

[0034] During the process of polypropylene raw material being fed into extruder 10 from feed box 20 through discharge pipe 21.

[0035] First, the connecting ring 31 drives the bracket 41 to rotate. Since the first support rod 411 is located inside the connecting ring 31 and is set in a horizontal direction, the first support rod 411 can effectively prevent the discharge pipe 21 from being blocked when it rotates with the connecting ring 31.

[0036] Secondly, the bracket 41 drives the adjusting cover 43 to rotate through the guide rod 44 and the electric telescopic rod 42. The adjusting cover 43 has a conical structure, which facilitates the material to flow along the inclined surface of the adjusting cover 43 to the discharge pipe 21. At the same time, the adjusting cover 43 can buffer the raw material and prevent the raw material from entering the feeding box 20 and falling directly into the extruder 10 along the discharge pipe 21, thereby reducing the impact of the raw material on the screw inside the extruder 10.

[0037] Finally, the electric telescopic rod 42 is raised and lowered, which in turn drives the adjusting cover 43 to rise and fall through the third support rod 45, thereby adjusting the distance between the bottom edge of the adjusting cover 43 and the inner wall of the feeding box 20, thus controlling the amount of raw material fed. The guide rod 44 and the guide sleeve 431 slide together, which helps to ensure the stability of the raising and lowering of the adjusting cover 43.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A feeding device for a polypropylene extruder, comprising an extruder and a hopper, the hopper being provided at the bottom with a discharge pipe, the discharge pipe being in communication with the extruder, characterized in that, The inner side of the discharge pipe is provided with a connecting ring that is rotatably connected to it, and the outer side is provided with a servo motor. A gear ring is sleeved on the outer side of the connecting ring, and the output shaft of the servo motor is provided with a gear that meshes with the gear ring. A moving rod is provided on the top surface of the connecting ring, and the moving rod rotates with the connecting ring.

2. The feeding device of claim 1, wherein The feeding box is equipped with a feeding adjustment mechanism, which includes an adjustment cover, a bracket, and an electric telescopic rod. The bracket includes a first support rod and a second support rod connected vertically. The first support rod is horizontally arranged inside the connecting ring, and the top of the second support rod is provided with a support plate. The electric telescopic rod is vertically arranged on the top surface of the support plate. The adjustment cover has a conical structure, and the projected area of ​​the bottom surface of the adjustment cover is the same as the area of ​​the connecting ring. The telescopic end of the electric telescopic rod is connected to the inner tip of the adjustment cover. The axes of the second support rod, the adjustment cover, and the connecting ring coincide.

3. The feed arrangement of claim 2, wherein, The top surface of the support plate is provided with a guide rod, which is perpendicular to the support plate. The adjustment cover is provided with a guide sleeve, and the guide rod slides through the guide sleeve.

4. The feed arrangement of claim 3, wherein, Multiple guide rods are evenly distributed circumferentially around the electric telescopic pole, with the electric telescopic pole as the center.

Images