CN213954049U - Optimization structure of main cylinder of extruder - Google Patents

Abstract

The utility model discloses an optimization structure of extruder main cylinder, including back beam and fixed connection in master cylinder on the back beam, the front end of master cylinder have be used for with the flange of the mutual conical surface cooperation butt of back beam, wherein, the flange orientation the one end of back beam is provided with first conical surface, first conical surface passes through the fillet transition with linking department of master cylinder, be provided with on the back beam with first conical surface looks butt complex second conical surface. The utility model provides an optimization structure of extruder main cylinder utilizes between flange and the back beam through conical surface cooperation butt, has reduced the stress value at fillet, has improved the fatigue resistance ability and the life-span of main cylinder greatly, has reduced the amount of deflection of back beam bending deformation, has reduced the requirement to the main cylinder material, save material cost.

Description

Optimization structure of main cylinder of extruder

Technical Field

The utility model relates to an extruder main cylinder technical field especially relates to an optimization structure of extruder main cylinder.

Background

The extrusion force of the extruder is mainly generated by a main cylinder, and when the main cylinder works, the flange part of the cylinder is tightly attached to the front end face of the rear beam and transmits the extrusion force. In the prior art, a flange on a main cylinder is of a planar structure, namely, the abutting surface of the flange and the front end surface of a rear beam is in planar fit, and extrusion force vertically acts on the planar end surface of the flange during working, so that a transition fillet at the joint of a main cylinder body of the flange bears larger bending stress; the extrusion force is transmitted in a one-burst intermittent unidirectional mode, the stress acting on the flange is changed between positive and zero, and under the intermittent action of the extrusion force, the fillet is easy to generate fatigue cracks and damage.

SUMMERY OF THE UTILITY MODEL

In order to overcome at least one kind of defect of above-mentioned prior art, the utility model provides an extruder main cylinder optimizes the structure.

The utility model discloses a solve the technical scheme that its problem adopted and be:

the utility model provides an optimization structure of extruder main cylinder, includes back beam and fixed connection in master cylinder on the back beam, the front end of master cylinder have be used for with the flange of the mutual conical surface cooperation butt of back beam, wherein, the flange orientation the one end of back beam is provided with first conical surface, first conical surface passes through the fillet transition with the linking department of master cylinder, be provided with on the back beam with first conical surface looks butt complex second toper face.

The utility model provides an optimization structure of extruder main cylinder, through conical surface cooperation butt between flange and the back beam, during operation, the extrusion force acts on the conical surface between flange and the back beam to form the normal pressure perpendicular to the conical surface, and this normal pressure can be decomposed into axial effort and radial effort at the conical surface department, thereby has changed the stress state of flange and back beam butt face; when the positive pressure acts on the flange, the first conical surface of the flange bears the axial acting force and the inward radial acting force, the radial acting force can resist the expansion deformation of the joint of the main cylinder and the flange, and the degree of the sudden change of the overall dimension of the flange at the joint of the main cylinder is reduced by the first conical surface of the flange, so that the stress concentration factor at the round angle is reduced, the stress value of the round angle is obviously reduced, the fatigue resistance of the main cylinder is greatly improved, and the service life of the main cylinder is greatly prolonged; when the positive pressure acts on the rear beam, the second conical surface of the rear beam bears the axial acting force and the outward radial acting force at the same time, the radial acting force can resist the bending deformation of the rear beam, and the deflection of the bending deformation of the rear beam is reduced; in addition, due to the reduction of the stress value at the fillet, the requirement on the material of the main cylinder can be reduced during design and production, and the material cost is saved.

Further, the axis of the first conical surface, the axis of the second conical surface and the axis of the master cylinder are on the same straight line.

Further, the taper angle of the first taper surface is 45 degrees.

Furthermore, a plurality of countersunk head screw holes are formed in the second conical surface, a plurality of through holes corresponding to the countersunk head screw holes are formed in the flange, and fixing screws penetrate through the through holes and are in threaded connection with the countersunk head screw holes so as to fixedly connect the flange to the back beam.

Furthermore, all the countersunk head screw holes are uniformly distributed along the circumference of the axis of the second conical surface.

To sum up, the utility model provides an optimization structure of extruder main cylinder has following technological effect:

the flange and the back beam are abutted in a matched manner through the conical surfaces, so that the stress value of a fillet is reduced, the fatigue resistance and the service life of the main cylinder are greatly improved, the deflection of the bending deformation of the back beam is reduced, the requirements on the material quality of the main cylinder are reduced, and the material cost is saved.

Drawings

Fig. 1 is a schematic front view of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 3 is an enlarged partial view of portion A of the lower flange-to-back interface of FIG. 2;

fig. 4 and 5 are schematic diagrams illustrating a force analysis of the rear beam and flange low junction surface according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a force analysis of a low-profile interface between a rear beam and a flange in the prior art.

Wherein the reference numerals have the following meanings:

1. a rear beam; 11. mounting holes; 12. a second tapered surface; 13. countersunk head screw holes; 2. a master cylinder; 21. a flange; 211. a first conical surface; 212. a through hole; 22. round corners; 3. a set screw; 4. a main plunger; 5. and (7) pressing the cover.

Detailed Description

For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but 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 thus, should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1 and 2, the utility model discloses an extruder main cylinder's optimization structure, including back beam 1 and fixed connection in main cylinder 2 on the back beam 1, the front end of main cylinder 2 has flange 21.

Specifically, the rear beam 1 is provided with a mounting hole 21 matched with the main cylinder 2, the main cylinder 2 is mounted on the mounting hole 21 of the rear beam 1, the flange 21 is located at the front end of the rear beam 1 and is abutted to the rear beam 1, and the fixing screw 3 penetrates through the flange 21 and is fixed with the rear beam 1 in a threaded manner. The main plunger 4 is connected to the main cylinder 2 in a sliding mode, and a gap between the main plunger 4 and the main cylinder 2 is sealed through a sealing ring on the inner side of the gland 5.

Referring to fig. 2 and fig. 3, in the present embodiment, the flange 21 and the back beam 1 are in contact with each other through a conical surface, wherein a first conical surface 211 is disposed at an end of the flange 21 facing the back beam 1, a joint of the first conical surface 211 and the master cylinder 2 is transited through a fillet 22, and a second conical surface 12 in contact with and in contact with the first conical surface 211 is disposed on the back beam 1.

Referring to fig. 6, in the prior art, an end surface of the flange 21 is of a planar structure, that is, an abutting surface of the flange 21 and a front end surface of the rear beam 1 is in planar fit, when the master cylinder 2 works, an interacting extrusion force F is generated between the flange 21 and the rear beam 1, the extrusion force F is an axial acting force, and the extrusion force F is perpendicular to the end surface of the flange 21 due to the planar fit structure between the flange 21 and the rear beam 1, so that the fillet 22 bears a large bending stress, and the fillet 22 is easily subjected to fatigue cracking and damage under the intermittent action of the extrusion force F; similarly, the compressive force F acts perpendicularly on the front end surface of the rear beam 1, so that the rear beam 1 is subjected to a large axial bending stress.

Referring to fig. 4 and 5, however, in the present invention, since the flange 21 and the back beam 1 are abutted by the conical surface, the pressing force F between the flange 21 and the back beam 1 is obliquely applied to the conical surface to form a positive pressure Fn perpendicular to the conical surface, and the positive pressure Fn can be decomposed into an axial force F1 and a radial force F2 at the conical surface, so as to change the stressed state of the abutting surface of the flange 21 and the back beam 1.

When a positive pressure Fn acts on the flange 21, the first conical surface 211 of the flange 21 bears both an axial acting force F1 and an inward radial acting force F2, during operation, the main cylinder 2 is pressurized and expanded, the radial acting force F2 and the expansion force F3 of the main cylinder 2 can partially offset each other, so that expansion deformation at the joint of the main cylinder 2 and the flange 21 can be resisted, and simultaneously, the degree of abrupt change of the external dimension of the joint of the main cylinder 2 of the flange 21 is reduced through the first conical surface 211 of the flange 21, the stress concentration factor at the fillet 22 is reduced, the stress value of the fillet 22 is obviously reduced, and the fatigue resistance and the service life of the main cylinder 2 are greatly improved.

When the positive pressure Fn acts on and is reflected on the second tapered surface 12 of the rear beam 1, the second tapered surface 12 of the rear beam 1 receives both the axial force F1 and the outward radial force F2, and the radial force F2 resists the bending deformation of the rear beam 1, reducing the bending deformation deflection of the rear beam 1.

In addition, due to the reduction of the stress value at the fillet 22, the requirement on the material of the main cylinder 2 can be reduced during design and production, and the material cost is saved. For example, in the prior art, to achieve the strength required for the normal operation of the main cylinder 2, the main cylinder 2 needs to be made of high-strength alloy steel, and the main cylinder 2 of the present invention can be made of common carbon steel.

In this embodiment, because the first conical surface 211 is adopted, under the condition that the height of the joint between the flange 21 and the master cylinder 2 is consistent, the radius of the fillet 22 in the present invention can be made larger, so as to better disperse the stress borne by the fillet 22.

Referring to fig. 2 and 3, in the present embodiment, the axis of the first tapered surface 211, the axis of the second tapered surface 12, and the axis of the master cylinder 2 are on the same straight line.

In this embodiment, the taper angle of the first taper surface 211 is 45 degrees.

In this embodiment, a plurality of countersunk screw holes 13 are formed in the second tapered surface 12, a plurality of through holes 212 corresponding to the countersunk screw holes 13 are formed in the flange 21, and fixing screws 3 penetrate through the through holes 212 and are screwed with the countersunk screw holes 13 to fixedly connect the flange 21 to the back beam 1. Through countersunk head screw hole 13 to better protect second conical surface 12 not influenced when processing and connecting, ensure first conical surface 211 and second conical surface 12 keep higher face laminating degree.

Preferably, all of the countersunk holes 13 are uniformly distributed along the circumference of the axis of the second conical surface 12.

To sum up, the utility model provides an extruder main cylinder optimize structure utilizes between flange 21 and the back beam 1 through conical surface cooperation butt, has reduced fillet 22's stress value, has improved main cylinder 2's fatigue resistance ability and life-span greatly, has reduced the amount of deflection of back beam 1 bending deformation, has reduced the requirement to main cylinder 2 materials, save material cost.

The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims (5)

1. An optimization structure of extruder main cylinder which characterized in that: including back beam (1) and fixed connection in master cylinder (2) on back beam (1), the front end of master cylinder (2) have be used for with flange (21) of the mutual conical surface cooperation butt of back beam (1), wherein, flange (21) orientation the one end of back beam (1) is provided with first conical surface (211), the transition of fillet (22) is passed through in the joint department of first conical surface (211) and master cylinder (2), be provided with on back beam (1) with first conical surface (211) looks butt complex second conical surface (12).

2. The optimization structure of claim 1, wherein: the axis of the first conical surface (211), the axis of the second conical surface (12) and the axis of the master cylinder (2) are on the same straight line.

3. The optimization structure of claim 1, wherein: the taper angle of the first taper surface (211) is 45 degrees.

4. The optimization structure of any one of claims 1 to 3, characterized in that: a plurality of countersunk head screw holes (13) are formed in the second conical surface (12), a plurality of through holes (212) corresponding to the countersunk head screw holes (13) are formed in the flange (21), and fixing screws (3) penetrate through the through holes (212) and are in threaded connection with the countersunk head screw holes (13) so as to fixedly connect the flange (21) to the rear beam (1).

5. The optimization structure of claim 4, wherein: all the countersunk head screw holes (13) are uniformly distributed along the circumference of the axis of the second conical surface (12).

Images