Vacuum suction mechanism of double-step extruder

Abstract

The utility model relates to the technical field of plastic particle production equipment, in particular to a vacuum suction mechanism of a double-stage extruder, which is arranged at the joint of a front-stage extruder and a rear-stage extruder and comprises a vacuum chamber, the rear end of the vacuum chamber is butted with an outlet at the tail end of the front-stage extruder, and an outlet at the lower end of the vacuum chamber is butted with a feed port of the rear-stage extruder. A maintenance door is connected to an opening in the front end of the vacuum chamber through a hinge, a vacuum suction opening is formed in the top of the vacuum chamber, and the vacuum suction opening is connected with vacuum equipment through a vacuum suction pipeline and provided with a vacuum meter. When the mechanism works, water vapor can be effectively sucked away, suction of plastic raw materials can be reduced, and therefore the possibility that a vacuum pipeline is blocked is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic particle production equipment, in particular to a vacuum suction mechanism of a double-stage extruder. Background Art

[0002] The two-stage extruder is suitable for the production of complex products such as composite materials, foam materials, and special-shaped materials. It is more efficient than the single-stage extruder in mass production and can reduce production costs. The two-stage extruder consists of two extruders, the front extruder mainly completes the extrusion plasticization process, and the rear extruder mainly completes the extrusion molding. Since the raw materials of the extruder have a certain moisture content, water vapor will be formed at the high temperature inside the barrel, which needs to be sucked away. The industry usually calls this operation vacuum suction or vacuum pumping.

[0003] The vacuum suction operation of the existing two-stage extruder is generally completed in the middle section of the front-stage extruder, and the vacuum suction port is directly opened on its barrel. Since the vacuum suction port is close to the plastic raw material, it is inevitable that a small amount of plastic raw material will be sucked away when sucking away water vapor. As time accumulates, the vacuum pipeline may be blocked. After the vacuum pipeline is blocked, water vapor is mixed into the plastic raw material, resulting in pores in the product. This problem has yet to be solved. Summary of the invention

[0004] The purpose of the utility model is to overcome the deficiencies in the above-mentioned background technology and provide a vacuum suction mechanism for a double-stage extruder, which can effectively absorb water vapor during operation and reduce the suction of plastic raw materials, thereby reducing the possibility of blockage of the vacuum pipeline.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A vacuum suction mechanism for a double-stage extruder is arranged at the junction of a front-stage extruder and a rear-stage extruder, and comprises a vacuum chamber, the rear end of the vacuum chamber is butted against the tail end outlet of the front-stage extruder, and the lower end outlet is butted against the feed port of the rear-stage extruder, the butt joints are sealed, a maintenance door is connected to the front end opening of the vacuum chamber via a hinge, a vacuum suction port is provided on the top of the vacuum chamber, the vacuum suction port is connected to a vacuum device via a vacuum suction pipeline, and a vacuum gauge is provided.

[0007] Preferably, a horizontally arranged baffle is provided below the vacuum suction port, the top surface of the baffle is connected to the top inner wall of the vacuum chamber through a plurality of connecting columns and maintains a certain distance, and the edges around the baffle extend a distance relative to the edges around the vacuum suction port.

[0008] Preferably, the top of the vacuum suction port is connected to the middle tube, the side of the middle tube is connected to the vacuum suction pipeline, and the top of the middle tube is detachably connected to the vacuum gauge.

[0009] Preferably, the maintenance door is locked by a lock after closing.

[0010] Preferably, a transparent observation window is provided on the maintenance door.

[0011] The utility model has the following beneficial effects: the utility model changes the vacuum suction position to the joint between the front-stage extruder and the rear-stage extruder. After the water vapor in the front-stage extruder comes out with the plasticized raw materials, the water vapor will be sucked away, and the plasticized raw materials will fall to the feed port of the rear-stage extruder to continue extrusion molding. Since the vacuum suction port is far away from the tail end outlet in the front-stage extruder, the sucked plastic raw materials will be reduced, and a baffle is provided below the vacuum suction port. The kinetic energy of some of the sucked plastic raw materials is reduced in the process of bypassing the baffle and entering the vacuum suction port, and they will fall to the feed port of the rear-stage extruder or adhere to the baffle. After entering the middle tube, the vacuum suction pipeline will be redirected to the side again. This structure will further reduce the plastic raw materials entering the vacuum suction pipeline, thereby greatly reducing the possibility of blockage of the vacuum pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is a schematic structural diagram of an embodiment of the utility model.

[0013] The figure includes: a front-stage extruder 1, a rear-stage extruder 2, a vacuum chamber 3, a lock 4, a maintenance door 5, an observation window 6, a feed port 7, a vacuum suction pipe 8, a baffle 9, a connecting column 10, an intermediate pipe 11, and a vacuum gauge 12. DETAILED DESCRIPTION

[0014] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments, but the utility model is not limited to the following embodiments.

[0015] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0016] This embodiment provides a vacuum suction mechanism for a two-stage extruder, such as Figure 1As shown, it is arranged at the junction of the front-stage extruder 1 and the rear-stage extruder 2, and includes a vacuum chamber 3 made of stainless steel. The vacuum chamber 3 is square, and its rear end is connected to the tail end outlet of the front-stage extruder 1, and the connection is sealed. The lower end outlet of the vacuum chamber 3 is connected to the feed port 7 of the rear-stage extruder 2, and the connection is sealed. The front opening of the vacuum chamber 3 is connected to a maintenance door 5 through a hinge, and a transparent observation window 6 is provided on the maintenance door 5. After the maintenance door 5 is closed, it is locked by a lock 4. A vacuum suction port is opened at the top of the vacuum chamber 3, and the vacuum suction port is connected to the vacuum equipment through a vacuum suction pipe 8 and is provided with a vacuum gauge 12.

[0017] When the above structure is working, the vacuum equipment is started to generate negative pressure in the vacuum chamber 3, and the water vapor coming out of the tail end of the front-stage extruder 1 is sucked away, which does not affect the plasticized raw materials falling to the feed port 7 of the rear-stage extruder 2 to continue extrusion molding. The vacuum gauge 12 can detect the vacuum degree. When the pressure of the vacuum gauge 12 is 0, it means that there is no negative pressure in the vacuum chamber 3, and the vacuum suction pipe 8 is blocked, and maintenance is required at this time. When vacuum suction is performed at the tail end of the front-stage extruder 1, since the plastic raw materials are basically completely plasticized, and the vacuum suction port is relatively far away from the plastic raw materials coming out of the tail end, it is difficult to suck away the plastic raw materials during vacuum suction, reducing the possibility of blockage of the vacuum suction pipe 8.

[0018] In a further solution, a horizontally arranged baffle 9 is provided below the vacuum suction port, and the top surface of the baffle 9 is connected to the top inner wall of the vacuum chamber 3 through a plurality of connecting columns 10 and maintains a certain distance, and the edges around the baffle 9 extend a certain distance relative to the edges around the vacuum suction port.

[0019] When the above structure is working, a water vapor channel can be formed between the baffle 9 and the inner wall of the top of the vacuum chamber 3. If there is still plastic raw material being sucked up, it needs to bypass the edge of the baffle 9 before entering the vacuum port. The kinetic energy of the plastic raw material will be reduced, and it will fall to the feed port 7 of the subsequent extruder 2 or adhere to the baffle 9, which further reduces the possibility of blockage of the vacuum pipe 8.

[0020] In a further solution, the top of the vacuum suction port is connected to the middle tube 11 , the side of the middle tube 11 is connected to the vacuum suction pipe 8 , and the top of the middle tube 11 is detachably connected to the vacuum gauge 12 .

[0021] When the above structure is working, the vacuum suction pipe is connected to the side of the middle pipe 11. If there is still plastic raw material bypassing the edge of the baffle 9 and entering the vacuum suction port, it also needs to turn again in the middle pipe 11, and the kinetic energy is further reduced. It will fall down or adhere to the inner wall of the middle pipe 11, further reducing the possibility of clogging the vacuum suction pipe 8. The vacuum gauge 12 is set at the top of the middle pipe 11, which is higher than the vacuum suction pipe 8, which can effectively reduce the possibility of the detection port of the vacuum gauge 12 being blocked.

[0022] The above is only a preferred embodiment of the utility model. For those skilled in the art, the utility model can be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A vacuum suction mechanism for a two-stage extruder, characterized in that: It is arranged at the connection between the front-stage extruder (1) and the rear-stage extruder (2), and comprises a vacuum chamber (3). The rear end of the vacuum chamber (3) is connected to the tail end outlet of the front-stage extruder (1), and the lower end outlet is connected to the feed port (7) of the rear-stage extruder (2). The connection parts are sealed. The front end opening of the vacuum chamber (3) is connected to a maintenance door (5) via a hinge. The top of the vacuum chamber (3) is provided with a vacuum suction port, which is connected to the vacuum equipment via a vacuum suction pipe (8) and is provided with a vacuum gauge (12).

2. A vacuum suction mechanism for a two-stage extruder as claimed in claim 1, characterized in that: A horizontally arranged baffle plate (9) is provided below the vacuum suction port, the top surface of the baffle plate (9) being connected to the top inner wall of the vacuum chamber (3) via a plurality of connecting columns (10) and maintaining a certain distance therebetween, and the edges around the baffle plate (9) extending a certain distance relative to the edges around the vacuum suction port.

3. The vacuum suction mechanism of a two-stage extruder according to claim 1, characterized in that: The top of the vacuum suction port is connected to the intermediate tube (11), the side of the intermediate tube (11) is connected to the vacuum suction pipeline (8), and the top of the intermediate tube (11) is detachably connected to the vacuum gauge (12).

4. The vacuum suction mechanism of a two-stage extruder according to claim 1, characterized in that: After the maintenance door (5) is closed, it is locked by the lock buckle (4).

5. The vacuum suction mechanism of a two-stage extruder according to claim 1, characterized in that: The maintenance door (5) is provided with a transparent observation window (6).

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