CN101672355B

CN101672355B - Connecting rod mechanism

Info

Publication number: CN101672355B
Application number: CN2009101023442A
Authority: CN
Inventors: 朱建华; 王浩华
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-08-31
Filing date: 2009-08-31
Publication date: 2012-06-27
Anticipated expiration: 2029-08-31
Also published as: WO2011022947A1; CN101672355A

Abstract

The invention provides a connecting rod mechanism which comprises a first swing rod, a second swing rod, a first connecting rod and a second connecting rod that are arranged in the same plane. The connecting rod mechanism is characterized in that one end of the first swing rod is hinged with one end of the second swing rod by a first pin shaft; one end of the first connecting rod is hinged with the middle part of the first swing rod; one end of the second connecting rod is hinged with the middle part of the second swing rod; and the other end of the first connecting rod is hinged with the other end of the second connecting rod by a second pin shaft. Compared with the prior art, two swing rods and two connecting rods compose a dual-herringbone planar connecting rod mechanism; therefore, larger displacement amount between the other end of the first swing rod and the other end of the second swing rod can be obtained by smaller displacement amount between the first hinging point and the second hinging point, but the bracket ratio of the two displacement amounts is inconsistent; and the connecting rod mechanism is more flexible and applicable compared with the existing stroke adjusting mechanism with fixed ratio magnification.

Description

A kind of linkage mechanism

Technical field

The present invention relates to a kind of linkage mechanism, particularly a kind of linkage mechanism with stroke enlarging function.

Background technique

Linkage mechanism can be divided into planar linkage and spatial linkage according to the relative movement between the member.Planar linkage is to be connect with lower pair (revolute pair, sliding pair, spherical pair, spherepin pair, cylindric pair and screw pair etc.) by some members to form, so claim low counter gear again.Because lower pair is face contact, wear-resistant, the contact surface that adds revolute pair and sliding pair is cylndrical surface and plane, makes easyly, is easy to obtain higher accuracy of manufacturing, and therefore, planar linkage obtains extensive use in various machineries and instrument.

The component movement of linkage mechanism is various informative; Combination flexibly; Can realize rotating, swing, move and plane or spatial complex motion; Be usually used in the rigid body guiding, realize the known characteristics of motion or known trajectory, can also realize the amplification of stroke and angle, therefore be used as all kinds of actuators and functional part.Like the patent No. is that the Chinese model utility " operating table angle enlarger " of ZL200620045880.5 just relates to a kind of bar linkage structure, comprises two groups of revolute pairs that are fixed on operating table backboard upper/lower terminal; One group of revolute pair that is fixed on the operating table leg plate; One group of revolute pair that connects operating table backboard and leg plate; One group of revolute pair connects two groups of connecting rods that are arranged in parallel and hydraulic cylinder piston rod; Two groups of connecting rods, one of which end connect the revolute pair that above-mentioned hydraulic cylinder piston rod links to each other, the other end respectively with the backboard of above-mentioned operating table on revolute pair, the revolute pair on the leg plate link to each other.The cooperation of above-mentioned patent utilization piston motion and connecting rod constitutes a quadrangular mechanism, makes the movement angle of operation table top amplify, and has realized the enlarging function of stroke variable power; Regulate more flexibly, still, the linkage mechanism of above-mentioned patent need be fixed a plurality of kinematic pair when mounted; And in the mechanism because be provided with oil hydraulic cylinder; Piston rod movement needs certain stroke, makes that the whole volume of mechanism is bigger, can't be applicable to the installing space small device.

Other has; Like the patent No. is that the Chinese utility model patent " the engine air throttle electronic control of jointed gear unit is used actuator " of ZL200320108236.4 comprises stepper motor, closure; The position relative fixed of stepper motor and closure; It is characterized in that: the drive mechanism that adding one is made up of driving lever, drive link, follower lever between stepper motor and closure, wherein an end of driving lever is fixed on the stepper motor, is flexible connection between the other end of driving lever and the drive link; Follower lever one end is fixed on the closure, is flexible connection between follower lever and the drive link.This patent converts rotatablely moving of motor into through linkage mechanism the switching campaign of closure; Though volume is little, simple in structure and cost is low; What but this patent adopted is the hinge plane bar linkage structure that is joined end to end and formed by four connecting rods, and this bar linkage structure can only be realized the synchronism of both motion states, but can't realize the enlarging function of stroke or angle; More can't accomplish the amplification of the non-constant multiplying power of stroke or angle, regulate underaction.

Summary of the invention

Technical problem to be solved by this invention is to above-mentioned existing technology present situation a kind of linkage mechanism with non-constant multiplying power stroke enlarging function to be provided; This linkage mechanism is simple in structure, adjusting is flexible and volume is little, is applicable in the mechanical structure or product that installing space is limited or narrow and small.

The present invention solves the problems of the technologies described above the technological scheme that is adopted: this linkage mechanism; Include first swing arm, second swing arm, head rod and second connecting rod that are positioned at same plane; It is characterized in that: it is first articulating point that the end of an end of said first swing arm through first bearing pin and said second swing arm is hinged; One end of said head rod is hinged on the middle part of said first swing arm; One end of said second connecting rod is hinged on the middle part of said second swing arm, and the other end of the other end of said head rod through second bearing pin and said second connecting rod to be hinged be second articulating point.

In order to let quadratic crank mechanism of the present invention can realize the function that stroke automatically replies; Can also comprise an elasticity reset device; This elasticity reset device is made up of spring seat, support and spring; Wherein the main body of spring seat is inverted U-shaped; Middle part, two side in this spring seat main body vertically has long guiding hole, and the end of two side offers first hinging hole of mutual alignment respectively, and described first articulating point and second articulating point are simultaneously between the two side of this spring seat main body; And the two ends of first bearing pin are bearing in respectively in first hinging hole of respective side, and the said second bearing pin two ends are located in respectively in the long guiding hole of respective side and can be along this long guiding hole straight skidding; Described support is positioned on the spring seat main body; And link through described second bearing pin and described head rod, second connecting rod; Described spring is then spacing between described support and spring seat main body, so that described support has the trend that deviates from said spring seat all the time.So, on the other end of the other end of first swing arm and second swing arm, applying external force, second articulating point can slippage back and forth in long guiding hole; When second articulating point during gradually near first articulating point; Said spring is in compressive state, at this moment, removes external force; Under the elastic force restoring force effect of this spring, said support deviates from spring seat and makes second articulating point arrive the end away from first articulating point along the long guiding hole slippage.

For better fixing spring; Be convenient to the installation and the location of spring; The top of described spring seat main body also is provided with the sheathed setting sleeve of ammunition feed spring, and being inserted with one in this setting sleeve can be with respect to the directional post of this setting sleeve slippage, and the top of said directional post and said support are fixedly linked.

As preferably, described support can be designed to inverted U-shaped, and second hinging hole of mutual alignment is also offered in the end, two side of this support, and the two supports of described second bearing pin is in this second hinging hole of respective side; The top of said directional post is provided with outside thread; The top of said support offers a through hole; Said directional post top passes outside the said through hole, and said directional post is being positioned at position on the said through hole first nut that has been threaded; This directional post is being positioned at position under the said through hole second nut that has been threaded, and said first nut and second nut are positioned the top of said directional post among the through hole of said support.Because support Design is inverted U; The two side of support is connected on the spring seat through second bearing pin respectively, and is stressed more even, and the setting sleeve upper end is fixedly connected on a top of the trellis; Making between entire bracket and the spring seat can avoid support to rock for being rigidly connected.

Interference when considering link motion, the described head rod and second connecting rod are designed to arc-shaped structure respectively.The circular arc connecting rod can be avoided the interference in the movement process, also can reduce the volume of quadratic crank mechanism further, saves installing space.

Compared with prior art; The invention has the advantages that: form a pair of man type planar linkage by two swing arms and two connecting rods; This double font planar linkage is not owing to there is immovable point; First articulating point and second articulating point all can be movable; Through less relatively displacement amount between first articulating point and second articulating point, can obtain bigger displacement amount between the other end of the other end and second swing arm of first swing arm, the ratio between these two displacement amounts is non-constant; And this planar linkage has only four bars to form through being articulated and connected, and compact structure, volume are little, are applicable to more in the mechanical structure or product that installing space is narrow and small.

Description of drawings

Fig. 1 is the planar linkage structural representation of the embodiment of the invention.

Fig. 2 is for being equipped with the planar linkage structural representation of elasticity reset device on Fig. 1 basis.

Fig. 3 is the three-dimensional exploded view of linkage mechanism shown in Figure 2.

Fig. 4 is one of the user mode figure of planar linkage shown in Figure 2 (spring is in maximum compressibility).

Fig. 5 is two (spring is in maximum slack) of the user mode figure of planar linkage shown in Figure 2.

Fig. 6 is the user mode schematic representation of embodiments of the invention in chain lifting device.

Embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

As shown in Figure 1; For the planar linkage of the embodiment of the invention is a schematic representation; This linkage mechanism is a lanar four rod mechanism, includes first swing arm 1 that is positioned at same plane, second swing arm 2, head rod 3 and second connecting rod 4, the interference that causes at the volley for fear of linkage mechanism; First swing arm 1 and second swing arm 2 are straight-bar, and

head rod

3 and 4 of second connecting rods are designed to arc-shaped structure respectively;

Wherein, The end of one end of first swing arm 1 through first bearing pin 81 and second swing arm 2 is hinged and becomes the first articulating point a; One end of head rod 3 is hinged on the middle part of first swing arm 1; One end of second connecting rod 4 is hinged on the middle part of second swing arm 2, and the other end of the other end of head rod 3 through second bearing pin 82 and second connecting rod 4 is hinged and becomes the second articulating point b.

Like Fig. 2, shown in Figure 3, be one to have the quadratic crank mechanism of the function that stroke automatically replies, this quadratic crank mechanism is on the basis of Fig. 1, to have set up an elasticity reset device;

This elasticity reset device is made up of spring seat 5, support 6 and helical pressure spring 7; Wherein, The main body of spring seat 5 is inverted U-shaped, and the top of spring seat 5 main bodys is provided with the sheathed setting sleeve 53 of ammunition feed spring 7, be inserted with in this setting sleeve 53 one can do axial slip with respect to setting sleeve 53 directional post 54; To change the distance between support 6 and the spring seat 5 main body tops, the top of directional post 54 is provided with outside thread and is fixedly linked with support 6;

Middle part, two side in spring seat 5 main bodys vertically has long guiding hole 52; The end of two side offers first hinging hole 51 of mutual alignment respectively; The first articulating point a and the second articulating point b are simultaneously between the two side of these spring seat 5 main bodys; And the two ends of first bearing pin 81 are bearing in respectively in first hinging hole 51 of respective side, and second bearing pin, 82 two ends are located in respectively in the long guiding hole 52 of respective side and can be along these long guiding hole 52 straight skiddings;

Support 6 is positioned on spring seat 5 main bodys and is designed to inverted U-shaped; Second hinging hole 61 of mutual alignment is also offered in the end, two side of support 6, and support 6 links with head rod 3, second connecting rod 4 through second bearing pin 82, and spring 7 is spacing between support 6 and spring seat 5 main bodys; And make support 6 have the trend that deviates from spring seat 5 all the time; And the top of support 6 is offered and is equipped with a through hole 62, and the top of directional post 64 passes outside the through hole 62; And; Directional post 54 is being positioned at position on the through hole 62 first nut 63 that has been threaded, and this directional post 54 is positioned the top of directional post 54 among the through hole 62 of support 6 being positioned at be threaded second nut, 64, the first nuts 63 and second nut 64 of position under the through hole 62.

So; When the other end 21 of the other end 11 of first swing arm 1 and second swing arm 2 each other near the time; The second articulating point b can be in long guiding hole 52 slippages and near the first articulating point a, when the second articulating point b slides onto the bottommost of long guiding hole 52, at this moment; Spring 7 is in the maximum compressibility state, and is as shown in Figure 4; After removing external force, under the elastic force restoring force effect of spring 7, support 6 deviates from spring seat 5 motions and makes the second articulating point b along long guiding hole 52 slippages to the end away from the first articulating point a, and is as shown in Figure 5.

As shown in Figure 6; The user mode schematic representation of linkage mechanism in chain lifting device for present embodiment; This lifting device include can along the casing 2 of upright guide rail 1 ' move up and down ', be fixed on the motor 3 at casing 2 ' middle part ' and be arranged on casing 1 ' interior Transmitted chains wheels; The Transmitted chains wheels adopt the arrangement of existing technology, comprise be arranged with chain 7 ' draught wheel 4 ', Idle wheel 5 ' and driving wheel 6 ', chain strip adoption N type canoe;

So; Linkage mechanism two Idle wheels 5 of Transmitted chains wheels ' between; The other end 11 of first swing arm 1 and the other end 21 of second swing arm 2 can change the cornerite of chain 7 ' slack list on sprocket wheel through the drive system of being made up of rocking bar, pull bar, interlock crank and lifting wheel respectively, and then reduce the slack of chain.

The linkage mechanism of present embodiment is a double font mechanism, and volume is little, and is flexibly flexible, and all articulating points on the linkage mechanism all can be free movable, and spring is used for the tractive force of balance chain, can realize that the stroke of non-constant multiplying power amplifies.

Claims

1. linkage mechanism; Include first swing arm (1), second swing arm (2), head rod (3) and second connecting rod (4) that are positioned at same plane; It is characterized in that: it is first articulating point (a) that the end of an end of said first swing arm (1) through first bearing pin (81) and said second swing arm (2) is hinged; One end of said head rod (3) is hinged on the middle part of said first swing arm (1); One end of said second connecting rod (4) is hinged on the middle part of said second swing arm (2), and the other end of the other end of said head rod (3) through second bearing pin (82) and said second connecting rod (4) to be hinged be second articulating point (b);

Also comprise an elasticity reset device; This elasticity reset device is made up of spring seat (5), support (6) and spring (7); Wherein the main body of spring seat (5) is inverted U-shaped; Middle part, two side in this spring seat (5) main body vertically has long guiding hole (52); The end of two side offers first hinging hole (51) of mutual alignment respectively; Described first articulating point (a) and second articulating point (b) are positioned between the two side of this spring seat (5) main body simultaneously, and the two ends of first bearing pin (81) are bearing in respectively in first hinging hole (51) of respective side, and said second bearing pin (82) two ends are located in respectively in the long guiding hole (52) of respective side and can be along this long guiding hole (52) straight skidding;

Described support (6) is positioned on spring seat (5) main body; And link through described second bearing pin (82) and described head rod (3), second connecting rod (4); Described spring (7) is then spacing between described support (6) and spring seat (5) main body, so that described support (6) has the trend that deviates from said spring seat (5) all the time.

2. linkage mechanism according to claim 1; It is characterized in that: the top of described spring seat (5) main body also is provided with the sheathed setting sleeve (53) of ammunition feed spring (7); Being inserted with one in this setting sleeve (53) can be with respect to the directional post (54) of this setting sleeve (53) slippage, and the top of said directional post (54) and said support (6) are fixedly linked.

3. linkage mechanism according to claim 2; It is characterized in that: described support (6) is designed to inverted U-shaped; Second hinging hole (61) of mutual alignment is also offered in the end, two side of this support (6), and the two supports of described second bearing pin (82) is in this second hinging hole (61) of respective side; The top of said directional post (54) is provided with outside thread; The top of said support (6) offers a through hole (62); Said directional post (54) top passes outside the said through hole (62); And; Said directional post (54) is being positioned at position on the said through hole (62) first nut (63) that has been threaded, and this directional post (54) is being positioned at position under the said through hole (62) second nut (64) that has been threaded, and said first nut (63) and second nut (64) are positioned the top of said directional post (54) among the through hole (62) of said support (6).

4. according to claim 1 or 2 or 3 described linkage mechanisms, it is characterized in that: described head rod (3) and second connecting rod (4) are designed to arc-shaped structure respectively.