Tail sealing device of bulking machine

Abstract

The utility model discloses a bulking machine tail sealing device which comprises a hydraulic cylinder body, a piston rod is movably arranged in the hydraulic cylinder body, the end, away from the hydraulic cylinder body, of the piston rod extends out of the hydraulic cylinder body to be connected with a die head, and a sealing piece is fixed to the surface of the side, facing the die head, of the hydraulic cylinder body through a limiting assembly. The limiting bolt is inserted into the threaded hole, the sealing sleeve is fixed to the outer side of the hydraulic cylinder body, the concentricity of the sealing sleeve and the piston rod is guaranteed, the limiting bolt is changed from the axial direction to the radial direction to facilitate loosening and tightening, meanwhile, hard chromium plating treatment is conducted on the surface of the piston rod, abrasion resistance is improved, the size of the supporting sleeve is reset according to the actual situation, coaxiality is guaranteed, and vibration is reduced.

Description

Technical Field

[0001] This utility model specifically relates to a sealing device for the tail end of an extruder. Background Technology

[0002] An extruder utilizes mechanical energy converted into heat energy to provide kinetic energy. It typically employs a non-standard, non-uniformly spaced spiral system for extrusion and propulsion. Gas in the material is expelled and quickly replaced by the material itself. The material experiences shear force, causing backflow and increasing the pressure within the machine chamber. Simultaneously, mechanical energy is converted into heat energy through friction within the chamber, transforming the material into a fluid, gelatinous state. As the material is extruded to the outlet, the pressure instantly changes from high pressure to normal pressure and from high temperature to room temperature, causing moisture to rapidly evaporate from the structure. The friction between the spiral and the machine chamber further mixes, extrudes, heats, gels, and gelatinizes the material, resulting in structural changes. The original structure is disrupted, creating numerous micropores within the material. Finally, the material is cut and cooled by a cutting device, thus achieving its puffed shape.

[0003] In actual operation, poor sealing between the hydraulic cylinder and piston rod allows material to enter the cavity, causing localized wear of the internal support sleeve, severe damage to the surface of the hydraulic rod, uneven axial force, and abnormal equipment vibration. This results in severe wear of the mold head hydraulic cylinder, frequent leaks, and frequent problems with the hydraulic system, leading to a high downtime rate and high maintenance costs. Utility Model Content

[0004] The purpose of this invention is to provide a sealing device for the tail end of an extruder to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a tail sealing device for an extruder, comprising a hydraulic cylinder body, a piston rod movably disposed within the hydraulic cylinder body, the end of the piston rod extending away from the hydraulic cylinder body extending out of the hydraulic cylinder body and connected to a die head, and a sealing element fixed to the surface of the hydraulic cylinder body facing the die head by a limiting component.

[0006] Preferably, there is a gap between the inner cavity of the hydraulic cylinder and the piston rod, and a support sleeve is provided in the gap, which is sleeved on the piston rod.

[0007] Preferably, the sealing assembly includes a sealing sleeve fitted onto the side of the hydraulic cylinder facing the die head.

[0008] Preferably, the limiting component includes two threaded holes formed on the surface of the sealing sleeve, and the two threaded holes are symmetrically arranged.

[0009] Preferably, the threaded hole extends through the sealing sleeve into the hydraulic cylinder body.

[0010] Preferably, a limit bolt is inserted into the threaded hole.

[0011] Preferably, the piston rod surface is plated with hard chrome.

[0012] The technical effects and advantages of this utility model are as follows: The tail sealing device of the extruder is fixed to the outside of the hydraulic cylinder body by inserting the limiting bolt into the threaded hole, ensuring the concentricity of the sealing sleeve and the piston rod. The limiting bolt is changed from axial to radial for easy tightening and loosening. At the same time, the piston rod surface is plated with hard chrome to increase wear resistance. The support sleeve size is reset according to the actual situation to ensure coaxiality and reduce vibration. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the entire utility model.

[0014] In the diagram: 1. Hydraulic cylinder body; 2. Piston rod; 3. Die head; 4. Clearance; 5. Support sleeve; 6. Sealing sleeve; 7. Threaded hole; 8. Limit bolt. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] To ensure the concentricity of the sealing sleeve 6 and the piston rod 2, refer to Figure 1 As shown, the system includes a hydraulic cylinder body 1, within which a piston rod 2 is movably mounted. One end of the piston rod 2 extends away from the hydraulic cylinder body 1 and connects to a die head 3. A sealing element is fixed to the surface of the hydraulic cylinder body 1 facing the die head 3 via a limiting assembly. A limiting bolt 8 is inserted into a threaded hole 7 to fix a sealing sleeve 6 to the outside of the hydraulic cylinder body 1, ensuring concentricity between the sealing sleeve 6 and the piston rod 2. The limiting bolt 8 is changed from axial to radial for easier tightening and loosening. Simultaneously, the surface of the piston rod 2 is hard chrome plated to increase wear resistance. The dimensions of the support sleeve 5 are redesigned according to actual conditions to ensure coaxiality and reduce vibration.

[0017] To facilitate increased stability after installation of the sealing sleeve 6, please refer to... Figure 1As shown, there is a gap 4 between the inner cavity of the hydraulic cylinder body 1 and the piston rod 2. A support sleeve 5 is installed in the gap 4 and is fitted onto the piston rod 2. The size of the gap 4 is determined based on the actual size of the piston rod 2 and the hydraulic cylinder body 1, thereby resetting the size of the support sleeve 5 to ensure the coaxiality of the hydraulic cylinder body 1, the support sleeve 5, and the piston rod 2, reducing vibrations during operation. The sealing assembly includes a sealing sleeve 6 fitted onto the side of the hydraulic cylinder body 1 facing the die head 3. The limiting assembly includes two threaded holes 7 on the surface of the sealing sleeve 6. The two threaded holes 7 are symmetrically arranged to ensure the concentricity of the sealing sleeve 6 and the piston rod 2. The limiting bolt 8 is changed from axial to radial for easy tightening and loosening. After the sealing sleeve 6 is fixed by the limiting bolt 8, the sealing sleeve 6 will no longer directly rub against the piston rod 2, thus preventing damage to the hydraulic rod and the support sleeve 5. Material will not scatter along the cavity outside the equipment, improving practicality and increasing the sealing performance between the hydraulic cylinder body 1 and the piston rod 2. The threaded hole 7 extends through the sealing sleeve 6 into the hydraulic cylinder body 1. A limiting bolt 8 is inserted into the threaded hole 7. The axial insertion of the limiting bolt 8 is modified to radial insertion, ensuring the concentricity of the sealing sleeve 6 and the piston rod 2. This prevents the limiting bolt 8 from falling off during the operation of the hydraulic cylinder body 1, thus increasing the stability of the sealing sleeve 6. The piston rod 2 is plated with hard chrome to increase wear resistance.

[0018] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model.

Claims

1. A sealing device for the tail end of an extruder, characterized in that, It includes a hydraulic cylinder body (1), a piston rod (2) is movably arranged inside the hydraulic cylinder body (1), the end of the piston rod (2) away from the hydraulic cylinder body (1) extends to the outside of the hydraulic cylinder body (1) and is connected to a mold head (3), and a sealing element is fixed on the side of the hydraulic cylinder body (1) facing the mold head (3) by a limiting component.

2. The tail sealing device of the extruder according to claim 1, characterized in that: There is a gap (4) between the inner cavity of the hydraulic cylinder (1) and the piston rod (2), and a support sleeve (5) is provided in the gap (4), which is sleeved on the piston rod (2).

3. The extruder tail sealing device according to claim 2, characterized in that: The sealing assembly includes a sealing sleeve (6) fitted onto the side of the hydraulic cylinder body (1) facing the mold head (3).

4. The tail sealing device of the extruder according to claim 1, characterized in that: The limiting component includes two threaded holes (7) formed on the surface of the sealing sleeve (6), and the two threaded holes (7) are arranged symmetrically.

5. The tail sealing device of the extruder according to claim 4, characterized in that: The threaded hole (7) extends through the sealing sleeve (6) into the hydraulic cylinder body (1).

6. The tail sealing device of the extruder according to claim 5, characterized in that: A limit bolt (8) is inserted into the threaded hole (7).

7. The extruder tail sealing device according to claim 6, characterized in that: The piston rod (2) is plated with hard chrome.

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