CN217539587U

CN217539587U - Limiting device for piston pin in homogenizer

Info

Publication number: CN217539587U
Application number: CN202221687757.9U
Authority: CN
Inventors: 刘旭; 唐华飞; 王学根
Original assignee: Shanghai Samro Homogenizer Co ltd
Current assignee: Shanghai Samro Homogenizer Co ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-10-04
Anticipated expiration: 2032-07-01

Abstract

The utility model discloses a piston pin limiting device in a homogenizer, which comprises a piston (1), a piston pin (4) and a connecting rod (7), wherein the piston is arranged in an inner hole of a sliding guide (2) and reciprocates axially, and the outer wall of the big head end of the piston is in axial sliding contact with the inner hole wall of the sliding guide; the rear part of the big end of the piston is provided with a piston inner hole (11) and a piston pin hole (12) which are vertical to each other in the axial direction, the connecting rod bushing (3) is embedded in the inner hole of the small end of the connecting rod, the small end of the connecting rod is arranged in the piston inner hole, a piston pin penetrates through the piston pin hole to be inserted in the piston, and the piston and the connecting rod are tightly connected by penetrating through the inner hole of the connecting rod bushing; the two ends of the piston pin are formed with point contact convex parts (41) with semi-spherical structures, so that when the piston pin is installed in the piston pin hole and reciprocates axially, the point contact convex parts are in instantaneous point contact with the inner wall of the sliding guide. The utility model discloses can effectively avoid the piston pin to the excessive collision and the friction of smooth inner wall of leading, the life that the extension is smooth leads optimizes the installation of part, and it is convenient to maintain.

Description

Limiting device for piston pin in homogenizer

Technical Field

The utility model relates to a piston pin of isotropic symmetry especially relates to a stop device of piston pin in isotropic symmetry.

Background

Referring to fig. 1, a piston limiting structure inside a homogenizer in the prior art includes: the piston 1 is mounted in the inner hole of the sliding guide 2 to reciprocate axially. The rear part of the big end of the piston 1 is provided with a piston inner hole 11 and a piston pin hole 12 which are vertical to each other in the axial direction, the connecting rod bush 3 is embedded in the small end inner hole of the connecting rod, and the small end of the connecting rod 7 is arranged in the piston inner hole 11; the piston pin 4 is inserted into the piston 1 through the piston pin hole 12, and the piston is fixedly connected with the connecting rod through the inner hole of the connecting rod bushing.

The working principle of the homogenizer piston in the prior art is as follows: the external crankshaft drives the connecting rod and the piston 1 to do reciprocating axial motion in the inner hole of the sliding guide 2, so that torque transmission is realized. However, the big end of the piston 1 generates friction and vibration on the inner wall of the sliding guide 2 during the movement process, so that the piston pin 4 generates axial displacement in the piston pin hole 12, and the axial displacement of the piston pin 4 can cause the two ends of the piston pin 4 to generate friction or collision with the inner wall of the sliding guide 2, thereby causing the risk of pulling and even damaging the inner wall of the sliding guide 2.

In order to avoid the risk of damage to the inner wall of the slide guide 2, the piston pin 4 is usually secured in the piston pin bore 12 of the piston 1 by means of screws 6 and nuts 5, which limit its axial displacement in the piston pin bore 12. The screw 6 is tightly pressed on the piston pin 4, two tightly pressing planes 8 are required to be processed at two ends of the piston pin 4 so as to ensure the tightly pressing stress of the screw 6, and the tightly pressing planes of the piston pin are required to be processed by a machine tool. Meanwhile, during long-term operation, due to friction and vibration between parts, the screw 6 and the nut 5 are easy to loosen to cause axial movement of the piston pin 4, so that the inner wall of the sliding guide 2 is damaged. In addition, the problem of limited operation space exists during installation and maintenance, which is not beneficial to the jacking operation of the screw 6 on the jacking plane 8 of the piston pin 4, thereby influencing the limiting effect of the piston pin 4.

Disclosure of Invention

An object of the utility model is to provide a stop device of piston pin in isotropic symmetry can effectively avoid the piston pin to slide the excessive collision and the friction of leading the inner wall, and the smooth life who leads of extension optimizes the installation of part, and it is convenient to maintain.

The utility model discloses a realize like this:

a limiting device of a piston pin in a homogenizer comprises a piston, the piston pin and a connecting rod, wherein the piston is arranged in a sliding guide inner hole and axially moves in a reciprocating manner, and the outer wall of the big end of the piston is axially in sliding contact with the wall of the sliding guide inner hole; the rear part of the big end of the piston is provided with a piston inner hole and a piston pin hole which are vertical to each other in the axial direction, the connecting rod bushing is embedded in the small end inner hole of the connecting rod, the small end of the connecting rod is arranged in the piston inner hole, a piston pin penetrates through the piston pin hole to be inserted in the piston, and the piston and the connecting rod are fixedly connected by penetrating through the inner hole of the connecting rod bushing;

the two ends of the piston pin are respectively provided with a point contact convex part which is of a semicircular spherical structure, so that when the piston pin is arranged in the piston pin hole and reciprocates axially, the point contact convex parts at the two ends of the piston pin are in instantaneous point contact with the inner wall of the sliding guide.

The length of the piston pin is smaller than the diameter of the big end of the piston, so that when the connecting rod and the piston are coaxially arranged, a gap is reserved between the point contact convex parts at the two ends of the piston pin and the sliding guide inner wall.

The diameter of the piston pin is matched with the inner diameter of the piston pin hole, so that the outer wall of the piston pin is in clearance fit sliding connection with the inner wall of the piston pin hole.

Compared with the prior art, the utility model, following beneficial effect has:

1. the utility model discloses because the point contact convex part of both ends processing formation hemisphere face structure at the piston pin, the length of piston pin slightly is less than the diameter of piston stub end, make the piston when sliding and leading hole reciprocating motion, the point contact convex part of piston pin presents instantaneous point contact with the inner wall that slides and leads, the point contact convex part is minimum with the friction that slides and lead the inner wall this moment, can neglect, avoided sliding and leading the inner wall to pull or damage, and simultaneously, the piston pin can the axial move back after receiving frictional force's reaction force when with the contact of sliding and leading the inner hole wall, realize with this that proper motion axial is adjusted spacingly.

2. The utility model discloses owing to be equipped with the piston pin that has the point contact convex part, so need not to fasten spacing piston pin through the tight structure in top such as screw, nut, the tight plane in top to the manufacturing procedure of piston pin has been simplified, the assembly part quantity of piston pin has been reduced, the dismouting with maintain simple, convenient, and do not receive operating space's restriction.

Drawings

FIG. 1 is a cross-sectional view of a prior art piston pin limiting device in a homogenizer;

fig. 2 is a cross-sectional view of a piston pin stop in a homogenizer according to the present invention;

fig. 3 is an enlarged schematic view at a in fig. 2.

In the figure, 1 piston, 11 piston inner holes, 12 piston pin holes, 2 sliding guides, 3 connecting rod bushes, 4 piston pins, 41 point contact protrusions, 5 nuts, 6 bolts, 7 connecting rods and 8 jacking planes.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 2 and fig. 3, the piston pin limiting device in the homogenizer comprises a piston 1, a piston pin 4 and a connecting rod 7, wherein the piston 1 is installed in an inner hole of a sliding guide 2 and reciprocates axially, and the outer wall of the large end of the piston 1 is in axial sliding contact with the inner hole wall of the sliding guide 2; the rear part of the big end of the piston 1 is provided with a piston inner hole 11 and a piston pin hole 12 which are vertical to each other in the axial direction, the connecting rod bush 3 is embedded in the small end inner hole of the connecting rod 7, the small end of the connecting rod 7 is arranged in the piston inner hole 11, the piston pin 4 penetrates through the piston pin hole 12 to be inserted in the piston 1, and the piston 1 and the connecting rod 7 are fixedly connected through the inner hole of the connecting rod bush 3. The piston 1 and the piston pin 4 are assembled in the same manner as in the prior art and will not be described in detail here.

The two ends of the piston pin 4 are both formed with point contact convex parts 41, the point contact convex parts 41 are in a semicircular spherical structure, so that the piston pin 4 is installed in the piston pin hole 12, when the piston 1 reciprocates in the inner hole of the sliding guide 2 in the axial direction, the point contact convex parts 41 at the two ends of the piston pin 4 are in instantaneous point contact with the inner wall of the sliding guide 2, and excessive friction and collision between the two ends of the piston pin 4 and the inner wall of the sliding guide 2 are avoided. Because equipment can produce vibrations and friction at the normal operating in-process, can make piston pin 4 take place axial displacement, when any one end of piston pin 4 contacted 2 inner walls of sliding guide, under the reaction of frictional force, piston pin 4 can the axial displacement adjust spacing, and the point contact protruding part 41 is minimum with the friction of 2 inner walls of sliding guide, can neglect to effectively avoid 2 inner walls of sliding guide to pull and damage even.

The length of the piston pin 4 is slightly smaller than the diameter of the big end of the piston 1, namely the height of the piston pin hole 12, so that when the connecting rod 7 and the piston 1 are coaxially arranged, a gap is reserved between the point contact convex part 41 at the two ends of the piston pin 4 and the inner wall of the sliding guide 2. During the reciprocating motion of the piston 1, direct friction and collision between the two ends of the piston pin 4 and the inner wall of the sliding guide 2 can be avoided through the clearance; when the piston 1 generates friction and vibration to cause the piston pin 4 to do axial motion in the piston pin hole 12, the piston pin 4 can be adjusted by axial motion under the reaction of the friction force after the instantaneous point contact is realized between the point contact convex part 41 and the inner wall of the sliding guide 2, and the friction and the collision are avoided.

The diameter of the piston pin 4 is matched with the inner diameter of the piston pin hole 12, so that the outer wall of the piston pin 4 is in clearance fit sliding connection with the inner wall of the piston pin hole 12, the piston pin 4 does not need to be tightly pushed through a pushing structure such as a screw, a nut and a pushing plane, the axial limiting of the piston pin 4 is facilitated, and meanwhile, the assembling structure of the piston pin 4 and the processing and manufacturing difficulty of the piston pin are simplified.

The utility model discloses when the assembly, only need with the pinhole coincidence of the piston pinhole 12 of 1 big-end of piston end and connecting rod bush 3, with piston pin 4 assemble piston pinhole 12 and connecting rod bush 3 in the hole can, at last with the piston integral erection who connects slide lead 2 in the hole, its overall structure dismouting, maintenance convenience.

Referring to fig. 2 and fig. 3, the working principle of the present invention is:

the piston 1 realizes torque transmission through an external crankshaft through a connecting rod 7, so that the big end of the piston 1 reciprocates in the inner hole of the sliding guide 2 in the axial direction, the working principle of the piston 1 is the same as that of the prior art, and the details are not repeated here.

The both ends of piston pin 4 are processed into the point contact convex part 41 of half-round spherical surface structure, piston pin 4 is installed in the piston pin hole 12 of piston 1 big head end, its length slightly is less than the diameter of piston 1 big head end, make piston 1 when 2 hole reciprocating motion are led in the cunning, the point contact convex part 41 of piston pin 4 presents instantaneous point contact with the cunning 2 inner wall, and can realize axial regulation spacing through point contact convex part 41 and piston pin 4 and piston pin hole 12, make the frictional force and the impact of piston pin 4 with the cunning 2 inner wall minimum, can neglect, the life of the cunning 2 has been guaranteed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention, therefore, any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. A limiting device of a piston pin in a homogenizer comprises a piston (1), the piston pin (4) and a connecting rod (7), wherein the piston (1) is installed in an inner hole of a sliding guide (2) and axially moves in a reciprocating manner, and the outer wall of the large head end of the piston (1) is axially in sliding contact with the inner wall of the sliding guide (2); an axially vertical piston inner hole (11) and a piston pin hole (12) are formed in the rear part of the large end of the piston (1), the connecting rod bushing (3) is embedded in the small end inner hole of the connecting rod (7), the small end of the connecting rod (7) is installed in the piston inner hole (11), a piston pin (4) penetrates through the piston pin hole (12) to be inserted into the piston (1), and penetrates through the inner hole of the connecting rod bushing (3) to fixedly connect the piston (1) and the connecting rod (7);

the method is characterized in that: the two ends of the piston pin (4) are both provided with point contact convex parts (41), the point contact convex parts (41) are in a semi-circular spherical structure, so that when the piston pin (4) is installed in the piston pin hole (12) and reciprocates in the inner hole of the sliding guide (2) in the axial direction, the point contact convex parts (41) at the two ends of the piston pin (4) are in instantaneous point contact with the inner wall of the sliding guide (2).

2. The apparatus for limiting a piston pin in a homogenizer according to claim 1, wherein: the length of the piston pin (4) is smaller than the diameter of the big end of the piston (1), so that when the connecting rod (7) and the piston (1) are coaxially arranged, a gap is reserved between a point contact convex part (41) at two ends of the piston pin (4) and the inner wall of the sliding guide (2).

3. A piston pin limiting device in a homogenizer according to claim 1 or 2, characterized in that: the diameter of the piston pin (4) is matched with the inner diameter of the piston pin hole (12), so that the outer wall of the piston pin (4) is in clearance fit sliding connection with the inner wall of the piston pin hole (12).