CN110775858B

CN110775858B - Single-cylinder gear rack multi-stage telescopic mechanism

Info

Publication number: CN110775858B
Application number: CN201911083015.8A
Authority: CN
Inventors: 曾鸣; 曾刚
Original assignee: Chengdu Univeristy of Technology
Current assignee: Chengdu Univeristy of Technology
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-05-12
Anticipated expiration: 2039-11-07
Also published as: CN110775858A

Abstract

The invention discloses a single-cylinder gear rack multistage telescoping mechanism, which comprises a basic arm (1), a first-section arm (2), a second-section arm (3) and a hydraulic cylinder (5), wherein the basic arm (1), the first-section arm (2), the second-section arm (3) and the hydraulic cylinder (5) are sleeved with one another from inside to outside, the hydraulic cylinder (5) is arranged on the first-section arm (2), and one side of the first-section arm (2) is provided with a first transmission case (7) and a second transmission case (11) which are connected through a first transmission; the first transmission box (7) is connected with a first rear end gear (8) meshed with a first rack (9) arranged on the basic arm (1); the second transmission case (11) is connected with a first front end gear (12) meshed with a second rack (6) arranged on the two-section arm (3). The multi-stage synchronous telescopic arm has the advantages of simple structure, simple transmission and reliable work.

Description

Single-cylinder gear rack multi-stage telescopic mechanism

Technical Field

The invention relates to the field of engineering machinery telescopic mechanisms, in particular to a single-cylinder gear rack multistage telescopic mechanism.

Background

The current mainstream technology of engineering machinery multi-section arm single hydraulic cylinder multi-stage telescopic mechanism has two kinds: single cylinder rope row expansion and single cylinder bolt expansion. The two forms are complex in mechanism, complex in transmission and high in debugging and maintenance difficulty. And the single cylinder bolt is flexible and needs to be reciprocated and controlled step by step, which affects the working efficiency. The multi-stage telescopic technology of the crane boom is a key for restricting the bearing capacity and the working performance of the crane boom, and a novel telescopic mechanism which is simple in structure, simple in transmission and reliable in work needs to be researched.

Disclosure of Invention

In order to solve the problems, the invention provides a single-cylinder gear rack multistage telescoping mechanism which comprises a basic arm, a first section of arm, a second section of arm and a hydraulic cylinder, wherein the basic arm, the first section of arm, the second section of arm and the hydraulic cylinder are sleeved with each other; the first transmission box is connected with a first rear end gear meshed with a first rack arranged on the basic arm; the second transmission case is connected with a first front end gear meshed with a second rack arranged on the two-section arm.

Furthermore, first transmission case includes the awl tooth motion pair, transmits the rotation of first rear end gear to first transmission shaft.

Furthermore, the second transmission case includes a first bevel gear pair and a reverse gear pair, and the rotation of the first transmission shaft is transmitted to the first front end gear through the second bevel gear pair and the reverse gear pair in sequence.

Further, the total transmission ratio of the first front end gear to the first rear end gear is 1.

Furthermore, the telescopic mechanism also comprises a third section of arm sleeved with a second section of arm, and a third transmission case and a fourth transmission case which are connected through a second transmission shaft are arranged on the primary side of the second section of arm; the third transmission box is connected with a second rear-end gear meshed with a third rack arranged on one section of arm; and the fourth transmission case is connected with a second front-end gear meshed with a fourth rack arranged on the three-section arm.

The invention has the beneficial effects that: the invention utilizes simple gear rack transmission to transmit and convert the motion in the multiple sections of telescopic arms which are sleeved inside and outside, realizes the multi-stage synchronous telescopic, and has simple structure, simple and concise transmission and reliable work.

Drawings

FIG. 1 is a schematic structural view of an embodiment;

FIG. 2 is a view of the embodiment in a fully extended state;

FIG. 3 is a schematic view of a rack and pinion drive;

FIG. 4 is a schematic structural view of the second embodiment; (ii) a

The system comprises a base arm 1, a first-joint arm 2, a second-joint arm 3, a third-joint arm 4, a hydraulic cylinder 5, a second rack 6, a first transmission box 7, a first rear end gear 8, a first rack 9, a first transmission shaft 10, a second transmission box 11, a first front end gear 12, a first bevel gear kinematic pair 13, a second bevel gear kinematic pair 14, a reverse gear pair 15, a second transmission shaft 16, a third transmission box 17, a fourth transmission box 18, a third rack 19, a second rear end gear 20, a fourth rack 21 and a second front end gear 22.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are used only for distinguishing the description, and are not intended to indicate or imply relative importance.

The terms "upper", "lower", "inner", "outer", and the like, refer to an orientation or positional relationship based on that shown in the drawings, or that which is customarily placed in use of the inventive product, for convenience in describing and simplifying the invention, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the invention.

In the description of the present invention, it is also to be noted that the terms "disposed," "mounted," "connected," and the like are to be construed broadly unless otherwise specifically stated or limited. For example, it may be a fixed connection, a detachable connection, or an integrated connection: they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in fig. 1, a single-cylinder gear rack multi-stage telescopic mechanism comprises a basic arm 1, a first-section arm 2, a second-section arm 3 and a hydraulic cylinder 5, wherein the basic arm 1, the first-section arm 2, the second-section arm 3 and the hydraulic cylinder 5 are sleeved with each other from inside to outside, and the hydraulic cylinder 5 is arranged on the first-section arm 2, and is characterized in that a first transmission case 7 and a second transmission case 11 which are connected through a first transmission shaft 10 are arranged on one side of the first-section; the first transmission case 7 is connected with a first rear end gear 8 meshed with a first rack 9 arranged on the basic arm 1; the second gear box 11 is connected with a first front end gear 12 which is engaged with the second rack 6 arranged on the two-joint arm 3.

As shown in fig. 2, the one-joint arm 2 is pushed out from the base arm 1 as a driving arm by the hydraulic cylinder 5, and the two-joint arm 3 is synchronously pushed out as a driven arm by the rack-and-pinion transmission mechanism: when the first knuckle arm 2 is pushed out from the basic arm 1 by the hydraulic cylinder 5, a first rear end gear 8 meshed with a first rack 9 of the basic arm 1 at the rear end of the first knuckle arm 2 is forced to rotate, linear displacement of the first knuckle arm 2 is converted into rotary motion, a first transmission shaft 10 is driven after the direction of the first transmission box 7 is changed, the first transmission shaft 10 transmits torque to a second transmission box 11, a first front end gear 12 is driven to rotate after the direction of the first transmission box is changed and the direction of the second transmission box is changed, the gear 12 shifts a second rack 6 of the second knuckle arm 3, the rotation is converted into linear displacement, and the second knuckle arm 3 is pushed out simultaneously. When the driving arm retracts, the rear gear wheel rotates reversely, the working process is the same, and all the knuckle arms retract synchronously.

In the present embodiment, as shown in fig. 3, the first transmission case 7 includes a first bevel gear pair 13, which transmits the rotation of the first rear end gear 8 to the first transmission shaft 10. The second transmission case 11 includes a second bevel gear pair 14 and a reverse gear pair 15, and the rotation of the first transmission shaft 10 is transmitted to the first front end gear 12 through the bevel gear pair 14 and the reverse gear pair 15 in turn.

When the driving arm 2 stretches out and draws back, the first rear end gear 8 is rotated under the action of the first rack 9, the first conical tooth kinematic pair 13 on the same shaft changes the rotation of the transverse axis into the rotation of the longitudinal axis, the rotation is transmitted to the second conical tooth kinematic pair 14 through the first longitudinal transmission shaft 10 and is changed back into the rotation of the transverse axis, the rotation is changed through the reverse gear pair 15, the steering is then carried out, the first front end gear 12 is driven to rotate, the second rack 6 of the second knuckle arm 3 is stirred, and the second knuckle arm 3 is driven by the first knuckle arm 2 to stretch out and draw back simultaneously.

In the present embodiment, the total transmission ratio of the first front end gear 12 and the first rear end gear 8 is 1, and the driven arm and the driving arm extend and contract at the same speed and the same stroke. When special requirements are met, the total transmission ratio can be more or less than 1, and the driven arm can realize different speeds and strokes from the driving arm.

Example two

In this embodiment, an inner arm is added on the basis of embodiment 1, as shown in fig. 4, the telescopic mechanism further includes a three-section arm 4 sleeved with a two-section arm 3, and a third transmission case 17 and a fourth transmission case 18 connected through a second transmission shaft 16 are arranged on a primary side of the two-section arm 3; the third transmission case 17 is connected with a second rear end gear 20 meshed with a third rack 19 arranged on one section of arm 2; the fourth gear box 18 is connected to a second front end gear 22 which is engaged with a fourth rack 21 provided on the three-joint arm 4.

When the telescopic boom extends out, the first-section boom 2 is pushed out from the basic boom 1 by the hydraulic cylinder 5, and the second-section boom 3 and the third-section boom 4 are synchronously pushed out by two sets of gear and rack transmission mechanisms. The two-section arm 3 extends out as the driven arm of the one-section arm 2, the working process is the same as that of the embodiment 1, at the moment, the two-section arm 3 is simultaneously used as a second-stage driving arm to drive the three-section arm 4 to extend out synchronously, the working process is the same as that of the first stage, and on the basis, the telescopic arm can be continuously added to form a multi-stage synchronous telescopic mechanism.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims

1. A single-cylinder gear rack multi-stage telescopic mechanism comprises a basic arm (1), a first-section arm (2), a second-section arm (3) and a hydraulic cylinder (5), wherein the basic arm (1), the first-section arm (2), the second-section arm (3) and the hydraulic cylinder (5) are sleeved with one another inside and outside, and the hydraulic cylinder (5) is arranged on the first-section arm (2), and is characterized in that one side of the first-section arm (2) is provided with a first transmission case (7) and a second transmission case (11) which are connected through a first; the first transmission box (7) is connected with a first rear end gear (8) meshed with a first rack (9) arranged on the basic arm (1); the second transmission case (11) is connected with a first front end gear (12) meshed with a second rack (6) arranged on the two-section arm (3).

2. A single cylinder rack and pinion multistage retraction mechanism according to claim 1, characterized in that the first gearbox (7) comprises a bevel gear kinematic pair (13) transmitting the rotation of the first rear end gear (8) to the first transmission shaft (10).

3. A single cylinder gear rack multi-stage telescoping mechanism according to claim 1, characterized in that the second transmission case (11) comprises a first bevel gear kinematic pair (14) and a reverse gear pair (15), and the rotation of the first transmission shaft (10) is transmitted to the first front end gear (12) through the second bevel gear kinematic pair (14) and the reverse gear pair (15) in turn.

4. A single cylinder rack and pinion multistage retraction mechanism according to claim 1, characterized in that the total transmission ratio of the first front end gear (12) to the first rear end gear (8) is 1.

5. The single-cylinder gear rack multistage telescoping mechanism according to claim 1, characterized in that, the mechanism further comprises a three-section arm (4) sleeved with a two-section arm (3), a third transmission case (17) and a fourth transmission case (18) connected through a second transmission shaft (16) are arranged on the primary side of the two-section arm (3); the third transmission case (17) is connected with a second rear end gear (20) meshed with a third rack (19) arranged on the first-section arm (2); and the fourth transmission case (18) is connected with a second front-end gear (22) meshed with a fourth rack (21) arranged on the three-section arm (4).