CN111250390B

CN111250390B - Composite chaotic motion vibration structure

Info

Publication number: CN111250390B
Application number: CN202010131573.3A
Authority: CN
Inventors: 吕志鹏; 陈帅挥; 周思柱
Original assignee: Yangtze University
Current assignee: Yangtze University
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2022-06-10
Anticipated expiration: 2040-02-28
Also published as: CN111250390A

Abstract

The invention provides a composite chaotic motion vibration structure, wherein one end of a swing rod is hinged with a rack through a hinge pin, and the other end of the swing rod is connected with a crank-rocker mechanism so as to drive the swing rod to swing by taking the hinge pin as a circle center; the screen box is connected with the swing rod in a sliding mode through a sliding sleeve, and the screen box is connected with the rack through a slider-crank mechanism so as to drive the screen box to slide in a reciprocating mode along the swing rod. One end of the second crank is fixedly connected with the second driving shaft, the other end of the second crank is hinged with one end of the connecting rod, and the other end of the connecting rod is hinged with the swing rod. The structure of the crank rocker mechanism is as follows: one end of the second crank is fixedly connected with the second driving shaft, the other end of the second crank is hinged with one end of the second chaotic rod, the other end of the second chaotic rod is hinged with one end of the connecting rod, and the other end of the connecting rod is hinged with the swing rod. The invention has wider frequency band and more violent speed change than simple harmonic vibration. The vibration form is controllable, and can be independently controlled according to the characteristics of the screened materials, so that the vibration form is convenient to optimize according to the work task.

Description

Composite chaotic motion vibration structure

Technical Field

The invention relates to the field of screening equipment, in particular to a composite chaotic motion vibration structure.

Background

The vibrating screen is an important device widely applied to industries such as coal, chemical industry, agricultural production and the like, removes impurities and grades materials through screen surface vibration, and is an indispensable mechanical device. At present, the most typical traditional vibrating screen mainly comprises a circular vibrating screen, a linear vibrating screen and an elliptical vibrating screen which are vibrated by an inertia vibration exciter, the structure is complex, the motion trails of the traditional vibrating screen belong to conventional simple harmonic vibration, the amplitude is small, the amplitude is stable and unadjustable, the amplitude is generally smaller than 10mm, and for a damp material which is difficult to screen, due to the existence of moisture, damp fine grains are often agglomerated when screening operation is carried out, a series of problems such as blocking, hole blocking and hole sticking are easy to occur, so that the screening environment is deteriorated, the working efficiency is reduced, and the maintenance burden of a screening machine is increased. Therefore, it is necessary to design and develop a new vibrating screen mechanism to solve the above problems of the existing vibrating screen. Chinese patent document CN110238030A discloses a five-bar constraint metamorphic cleaning sieve, which uses a combination of a link mechanism and a spring resonance mechanism, and has a wider frequency band and a more drastic speed change compared with the prior art. However, the movement in the mechanism has more uncertainties, and the movement form is difficult to design according to the working conditions.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a composite chaotic motion vibration structure, which can generate a frequency band wider than simple harmonic vibration, more violent speed change and larger acceleration change, and the vibration form can be designed according to the working condition. The wet materials can be screened more efficiently, larger material groups can be processed, and the screening efficiency is improved.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a composite chaotic motion vibration structure comprises a rack, wherein one end of a swing rod is hinged with the rack through a hinge pin, and the other end of the swing rod is connected with a crank-rocker mechanism so as to drive the swing rod to swing by taking the hinge pin as a circle center;

the screen box is connected with the swing rod in a sliding mode through a sliding sleeve, and the screen box is connected with the rack through a slider-crank mechanism so as to drive the screen box to slide in a reciprocating mode along the swing rod.

In a preferred scheme, the crank rocker mechanism has the structure that: one end of the second crank is fixedly connected with the second driving shaft, the other end of the second crank is hinged with one end of the connecting rod, and the other end of the connecting rod is hinged with the swing rod.

In a preferred scheme, the crank rocker mechanism has the structure that: one end of the second crank is fixedly connected with the second driving shaft, the other end of the second crank is hinged with one end of the second chaotic rod, the other end of the second chaotic rod is hinged with one end of the connecting rod, and the other end of the connecting rod is hinged with the swing rod.

In a preferred embodiment, the second crank is provided with a plurality of pin holes, and the pin holes are arranged along the length direction of the second crank to adjust the driving radius of the second crank.

In a preferable scheme, the number of the swing rods is 1 or more, and the plurality of swing rods are connected with each other through a cross rod.

In a preferred scheme, the crank-slider mechanism is structurally characterized in that: one end of the first crank is fixedly connected with the first driving shaft, the other end of the first crank is hinged with one end of the sliding rod, and the other end of the sliding rod is hinged with the screen box.

In a preferred scheme, the crank-slider mechanism is structurally characterized in that: one end of the first crank is fixedly connected with the first driving shaft, the other end of the first crank is hinged with one end of the first chaotic rod, the other end of the first chaotic rod is hinged with one end of the sliding rod, and the other end of the sliding rod is hinged with the screen box.

In a preferred embodiment, the first crank is provided with a plurality of pin holes, and the pin holes are arranged along the length direction of the first crank to adjust the driving radius of the first crank.

In a preferable scheme, the two crank slide block mechanisms are respectively positioned at two sides of the screen box.

In the preferred scheme, the hinge pin between each rod piece adopts a replaceable pin shaft, the structure of the replaceable pin shaft is that a pin shaft body penetrates through the mutually connected rod pieces to be in threaded connection with a fixing screw, and a shaft sleeve is arranged on the outer wall of the pin shaft body;

the shaft sleeve is made of one of nylon, polytetrafluoroethylene and ultrahigh molecular weight polyethylene.

Compared with the prior art, the composite chaotic motion vibration structure combines the up-and-down swinging motion and the horizontal reciprocating motion together, has wider frequency band and more violent speed change than simple harmonic vibration, has controllable vibration form compared with the prior chaotic motion, can independently control the up-and-down swinging motion and the horizontal reciprocating motion according to the characteristics of material screening, and is convenient to select and optimize according to working tasks. In the preferred scheme, the chaotic rod pieces are arranged, so that the number of degrees of freedom of the two groups of rod pieces driving motion is 2, and the two groups of rod pieces form an underactuated motion mechanism with redundant degrees of freedom. The scheme makes the motion of sieve case in all directions have certain randomness from this to realize bigger acceleration change, further improve the screening effect of moist material and great material crowd.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

fig. 1 is a schematic front view of the present invention.

Fig. 2 is a schematic top view of the present invention.

Fig. 3 is a perspective view of the present invention.

Fig. 4 is a movement diagram of the present invention.

Fig. 5 is a schematic structural view of the first crank and the second crank in the present invention.

Fig. 6 is a schematic view of the hinge structure between the rods according to the present invention.

In the figure: the device comprises a screen box 1, a sliding rod 2, a first chaotic rod 3, a first crank 4, a sliding sleeve 5, a second driving shaft 6, a swing rod 7, a connecting rod 8, a discharge hopper 9, a second chaotic rod 10, a second crank 11, a rack 12, a hinge pin 121, a first driving shaft 13, a cross rod 14, a transmission hole 101, an interchangeable pin shaft 102, a pin shaft body 1021, a fixing screw 1022, a shaft sleeve 1023, a pin hole 103 and a driving radius 104.

Detailed Description

Example 1:

referring to fig. 1 to 4, a compound chaotic motion vibration structure includes a frame 12, one end of a swing rod 7 is hinged to the frame 12 through a hinge pin 121, and the other end of the swing rod 7 is connected to a crank and rocker mechanism to drive the swing rod 7 to swing around the hinge pin 121 as a circle center;

the screen box 1 is connected with the swing rod 7 in a sliding mode through a sliding sleeve 5, and the screen box 1 is connected with the rack 12 through a slider-crank mechanism so as to drive the screen box 1 to slide back and forth along the swing rod 7. With this configuration, the combination of the vertical swing motion and the substantially horizontal reciprocating sliding motion is realized, and the frequencies of the vertical swing motion and the reciprocating motion can be independently controlled.

In a preferable scheme, referring to fig. 1-4, the crank and rocker mechanism has the structure that: one end of a second crank 11 is fixedly connected with the second driving shaft 6, the other end of the second crank 11 is hinged with one end of a connecting rod 8, and the other end of the connecting rod 8 is hinged with the swing rod 7. Whereby the structure realizes an up-and-down swinging motion. The first driving shaft 13 is rotated by a motor or rotated by a motor through a reduction gear.

In a preferable scheme, referring to fig. 1-4, the crank-slider mechanism has the following structure: one end of the first crank 4 is fixedly connected with the first driving shaft 13, the other end of the first crank 4 is hinged with one end of the sliding rod 2, and the other end of the sliding rod 2 is hinged with the screen box 1. The structure realizes a horizontal reciprocating sliding motion structure.

In a preferred scheme, as shown in fig. 2, the number of the swing rods 7 is 1 or more, and a plurality of swing rods 7 are connected with each other through a cross rod. By the structure, the rigidity of the whole equipment is improved, and the service life is prolonged.

Preferably, as shown in fig. 5, a plurality of pin holes 103 are formed in the second crank 11, and the plurality of pin holes 103 are arranged along the length direction of the second crank 11 to adjust the driving radius 104 of the second crank 11. The driving radius 104 is referred to as a radius of rotation of a hinge point of a rod connected to each crank. For example when the radius of rotation of the point of articulation of the second crank 11 with the connecting rod 8 or when the first crank 4 is connected with the sliding rod 2. The driving radius 104 of the second crank 11 is used to adjust the amplitude of the up-and-down swinging movement of the sieve box 1.

Preferably, as shown in fig. 5, a plurality of pin holes 103 are formed on the first crank 4, and the plurality of pin holes 103 are arranged along the length direction of the first crank 4 to adjust the driving radius 104 of the first crank 4. The drive radius 104 of the first crank 4 is used to adjust the amplitude of the reciprocating movement of the sieve box 1 along the pendulum rod 7.

In a preferred scheme, as shown in fig. 2, the two crank-slider mechanisms are respectively positioned at two sides of the screen box 1. With this structure, the stability of the reciprocating motion is further improved.

In a preferred scheme, as shown in fig. 6, the hinge pin between the rod pieces adopts a replaceable pin shaft 102, the replaceable pin shaft 102 is structured in such a way that a pin shaft body 1021 penetrates through the interconnected rod pieces to be in threaded connection with a fixing screw 1022, and a shaft sleeve 1023 is arranged on the outer wall of the pin shaft body 1021; with this structure, the replaceable pin 102 can be easily replaced, and the replaceable pin 102 is a wearing part, so that it needs to be easily replaced.

The sleeve 1023 is made of one of nylon, polytetrafluoroethylene and ultrahigh molecular weight polyethylene. The structure of axle sleeve 1023 that adopts to have certain flexibility can reduce frictional force to can cushion certain impact.

Example 2:

on the basis of the embodiment 1, a preferable scheme is as shown in fig. 1-4, and the structure of the crank rocker mechanism is as follows: one end of a second crank 11 is fixedly connected with the second driving shaft 6, the other end of the second crank 11 is hinged with one end of a second chaotic rod 10, the other end of the second chaotic rod 10 is hinged with one end of a connecting rod 8, and the other end of the connecting rod 8 is hinged with a swing rod 7.

In a preferred scheme, the crank-slider mechanism is structurally characterized in that: one end of a first crank 4 is fixedly connected with a first driving shaft 13, the other end of the first crank 4 is hinged with one end of a first chaotic rod 3, the other end of the first chaotic rod 3 is hinged with one end of a sliding rod 2, and the other end of the sliding rod 2 is hinged with a screen box 1. The first chaotic rod 3 and the second chaotic rod 10 are provided with one degree of freedom to form an under-actuated and redundant degree of freedom motion mechanism, namely random chaotic motion is realized within a certain range in up-and-down swinging and approximately horizontal reciprocating motion, so that larger acceleration change is realized, and the screening effect on moist materials and larger material groups is improved.

Example 3:

taking the structure of embodiment 2 as an example, when a common bulk material needs to be screened, the first driving shaft 13 acts to drive the first crank 4 to rotate, and the first crank 4 drives the screen box 1 to realize a substantially horizontal reciprocating sliding motion through the first chaotic rod 3 and the sliding rod 2, so as to realize screening of the common bulk material, such as gravel. The screened material falls into the discharge hopper 9. The first chaotic rod 3 realizes random accelerated motion of the screen box 1 in the screening process so as to improve the screening effect.

Example 4:

taking the structure of the embodiment 2 as an example, when the hardened slab materials need to be screened, the second driving shaft 6 acts to drive the second crank 11 to rotate, and the second crank 11 drives the swing rod 7 to swing up and down through the second chaotic rod 10 and the connecting rod 8, so that the hardened slab materials are loosened through large-amplitude vibration, and screening is facilitated. The second chaotic rod 10 realizes random accelerated motion of the screen box 1 in the screening process so as to improve the screening effect.

Example 5:

taking the structure of the embodiment 2 as an example, when a wet material and a mixed material need to be screened, the first driving shaft 13 and the second driving shaft 6 both act to drive the screen box 1 to do a combined motion of reciprocating motion and up-and-down swinging along the swing rod 7, and the first chaotic rod 3 and the second chaotic rod 10 also realize random accelerated motion, so that the screening effect can be greatly improved. According to the deep analysis of different materials, the optimal screening motion model can be obtained, and the optimal screening effect can be obtained by adjusting the rotating speeds of the first driving shaft 13 and the second driving shaft 6 and the driving radiuses 104 of the first crank 4 and the second crank 11 to be fitted to the optimal screening motion model.

The above-described embodiments are merely preferred technical solutions of the present invention, and should not be construed as limiting the present invention, and the embodiments and features in the embodiments in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.

Claims

1. A compound chaotic motion vibration structure comprises a frame (12) and is characterized in that: one end of the swing rod (7) is hinged with the rack (12) through a hinge pin (121), and the other end of the swing rod (7) is connected with a crank rocker mechanism so as to drive the swing rod (7) to swing by taking the hinge pin (121) as the center of a circle;

the screen box (1) is connected with the swing rod (7) in a sliding manner through a sliding sleeve (5), and the screen box (1) is connected with the rack (12) through a slider-crank mechanism so as to drive the screen box (1) to slide along the swing rod (7) in a reciprocating manner;

the structure of the crank rocker mechanism is as follows: one end of a second crank (11) is fixedly connected with the second driving shaft (6), the other end of the second crank (11) is hinged with one end of a connecting rod (8), and the other end of the connecting rod (8) is hinged with the swing rod (7);

the crank block mechanism is structurally characterized in that: one end of the first crank (4) is fixedly connected with the first driving shaft (13), the other end of the first crank (4) is hinged with one end of the first chaotic rod (3), the other end of the first chaotic rod (3) is hinged with one end of the sliding rod (2), and the other end of the sliding rod (2) is hinged with the screen box (1).

2. The compound chaotic motion vibration structure according to claim 1, wherein: the structure of the crank rocker mechanism is as follows: one end of a second crank (11) is fixedly connected with the second driving shaft (6), the other end of the second crank (11) is hinged with one end of a second chaotic rod (10), the other end of the second chaotic rod (10) is hinged with one end of a connecting rod (8), and the other end of the connecting rod (8) is hinged with a swing rod (7).

3. The compound chaotic motion vibration structure according to any one of claims 1 to 2, characterized in that: a plurality of pin holes (103) are formed in the second crank (11), and the pin holes (103) are arranged along the length direction of the second crank (11) to adjust the driving radius (104) of the second crank (11).

4. The compound chaotic motion vibration structure according to any one of claims 1 to 2, characterized in that: the number of the swing rods (7) is 1 or more, and the plurality of swing rods (7) are connected with each other through a cross rod.

5. The compound chaotic motion vibration structure according to claim 1, wherein: a plurality of pin holes (103) are formed in the first crank (4), and the pin holes (103) are arranged along the length direction of the first crank (4) to adjust the driving radius (104) of the first crank (4).

6. The compound chaotic motion vibration structure according to claim 1, wherein: the two crank slide block mechanisms are respectively positioned at two sides of the screen box (1).

7. The compound chaotic motion vibration structure according to any one of claims 1 to 2, characterized in that: the hinge pin between each rod piece adopts a replaceable pin shaft (102), the replaceable pin shaft (102) has a structure that a pin shaft body (1021) penetrates through the mutually connected rod pieces to be in threaded connection with a fixing screw (1022), and the outer wall of the pin shaft body (1021) is provided with a shaft sleeve (1023);

the material of the shaft sleeve (1023) is one of nylon, polytetrafluoroethylene and ultra-high molecular weight polyethylene.