WO2005106138A1

WO2005106138A1 - An excavator

Info

Publication number: WO2005106138A1
Application number: PCT/CN2005/000499
Authority: WO
Inventors: Shuanglai Yang
Original assignee: Shuanglai Yang
Priority date: 2004-04-29
Filing date: 2005-04-14
Publication date: 2005-11-10
Also published as: CN2668706Y

Abstract

The present application discloses an excavator including an undercarriage (10) supporting the excavator, a revolving platform (20) mounted on the undercarriage (10), and a boom (30) linked with the revolving platform (20), wherein the excavator still includes a moment balancing device involving a counterweight body (60), and the balancing moment which the counterweight body (60) applies to the boom (30) and the gravity moment of the boom (30) are opposite. The moment balancing device still comprises a lever beam pivoted onto the revolving platform (20) at the central section, attached to the counterweight body (60) at an end, and directly or indirectly linked to the boom (30) at the other end. The excavator only requires few part of the motor's energy to surmount at least part of the weight of the boom, thus it can effectively save energy and reduce oil wear.

Description

Digging machine

The invention is based on a Chinese patent application filed on April 29, 2004, with an application number of 200420031417.6, and claims priority, the contents of which are incorporated herein by reference in its entirety.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator, and more particularly, to an excavator capable of applying a balance moment to a boom in a direction opposite to a direction of gravity moment of the boom. BACKGROUND OF THE INVENTION Excavator is a kind of engineering machinery, which is widely used in engineering construction in various fields such as water conservancy, electric power, transportation, mining, and construction, and plays an increasingly important role. FIG. 1 is a schematic structural diagram of a conventional excavator, which includes a chassis 10, a slewing platform 20, a boom 30, and a counterweight 40. The chassis 10 is used to support the excavator, so that the excavator is fixed in the working position and moved to a new working position. The slewing platform 20 is disposed on the chassis 10 and can perform slewing motion relative to the chassis 10 for mounting the boom 30 and driving the boom 30 to rotate. The slewing platform is also connected with a boom cylinder 50 for supporting the boom 30 and swinging the boom around its hinge point A with the slewing platform 20. An excavation mechanism is installed at the front end of the boom 30 for excavation work. The weight body 40 is fixed at the tail of the slewing platform 20 and is used to balance the gravity moment of the boom 30 to the bottom plate of the excavator and the slewing platform 20 to prevent the 4 excavator from tipping due to the excessive moment on the boom side during operation. The counterweight of a conventional excavator is fixedly installed at the tail of the excavator. Since the weight of the boom is completely supported by the boom cylinder 50, during the operation, each time the excavator excavates, the boom cylinder 50 must not only overcome the material Weight, and the weight of the boom 30 has to be overcome. Because the weight of the boom 30 is usually very large, the existing excavators need to do a lot of useless work, waste a lot of energy, and increase the fuel consumption. SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a method capable of overcoming the weight of a boom by using the principle of moment balance, which can overcome at least part of the weight of the boom without requiring more power from the engine, thereby effectively saving energy and reducing fuel consumption. To solve the above technical problems, the present invention provides an excavator, including a boom and a swing platform, the boom is connected to the swing platform, characterized in that the excavator further includes a torque balancing device, and The heavy-body swing arm support uses a counterweight to apply a balance torque to the boom in the direction opposite to the gravity moment of the boom. According to an embodiment of the present invention, the torque balancing device further includes a lever arm and a lever arm base. The middle portion of the lever arm is hinged on the lever arm base on the rotary platform, a weight body is installed at one end, and the other end is directly or indirectly Attach to the boom. Preferably, the lever arm is indirectly connected to the boom via a link or cable. Preferably, an upright fixing plate is provided on the upper surface of the boom, and one end of the connecting rod or cable is connected to the upper end of the fixing plate. Preferably, the lever arm is curved. According to another embodiment of the present invention, the torque balancing device further includes a pulley and a cable, the pulley is installed on the rotary platform, and the weight body is connected to the pulley around the pulley through a cable. On the big arm. Preferably, an upright fixing plate is provided on the upper surface of the boom, and one end of the cable is connected to the upper end of the fixing plate. Preferably, when the center of gravity of the boom is moved forward, the center of gravity of the weight body is moved backward, and when the center of gravity of the boom is moved backward, the center of gravity of the weight is moved forward.

^ Specifically, the balance weight of the counterweight is equal to the moment of gravity of the boom. Preferably, when the center of gravity of the boom moves back and forth, the center of gravity of the weight does not move back and forth. In the excavator according to the present invention, since the counterweight applies a balance torque to the boom in the direction opposite to the gravity moment of the boom, during the operation, the counterweight can overcome the weight of at least part of the boom, so the excavator mainly undertakes excavation The load basically no longer bears the deadweight load of the boom, which reduces useless work and saves fuel consumption. In the case where the center of gravity of the weight body moves in the opposite direction as the center of gravity of the boom moves back and forth, the balance moment can better offset the moment of gravity of the boom, so that a better energy saving effect can be achieved. By using the present invention, it is easy to save more than 50% of the fuel and improve the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS The purpose, advantages and features of the present invention can be more clearly understood through the following detailed description made in conjunction with the accompanying drawings, wherein the same features use the same reference numerals, in the figure: FIG. 1 is a schematic diagram of a conventional excavator structure; FIG. 2 is a schematic structural diagram of an excavator according to a first embodiment of the present invention, wherein a weight body is connected to a boom via a lever arm and a connecting rod, and the excavator is in working state one; FIG. 3 is a structure of the excavator shown in FIG. 2 Schematic diagram with excavator in working condition

FIG. 4 is a schematic structural diagram of the excavator shown in FIG. 2, where the excavator is in a working state

FIG. 5 is a structural schematic diagram of the excavator shown in FIG. 2, where the excavator is in working state IV; FIG. 6 is a structural schematic diagram of an excavator according to a second embodiment of the present invention, wherein a weight body passes through a cable and a pulley with a boom connection. DETAILED DESCRIPTION Reference will now be made to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the described embodiment, the same parts are given the same names and numbers, and repeated descriptions thereof will be omitted. Referring to FIG. 2, a structural diagram of an excavator according to a first embodiment of the present invention is shown, which includes a chassis 10, a swing platform 20, a boom 30, and a weight body 60. The chassis 10 is used to support the excavator, so that the excavator is fixed in the working position and moved to a new working position. The slewing platform 20 is disposed on the chassis 10 and can perform slewing motion relative to the chassis 10 for mounting the boom 30 and driving the boom 30 to rotate. A boom cylinder 50 is also connected to the swing platform, and is used to support the boom 30 and rotate the boom about its hinge point A with the swing platform 20. An excavation mechanism including a boom and a bucket is installed at the front end of the boom 30 for excavation work. The excavator also has a torque balancing device, which includes a weight body 60, a lever arm 62, and a connecting rod 64. A bracket 66 is provided at the tail of the turning platform 20, and a lever arm 62 is hinged on the bracket 66 with a middle portion. The lower end (rear end) of the lever arm 62 is fixedly connected to the weight body 60, and the upper end (front end) is connected to a rear end of the link 64. Even The front end of the rod 64 is connected to a fixing plate 32 provided on the upper surface of the boom 30. The lever arm 62 is curved, so that the rear end is raised upward. Among them, even 4 trunks 64 can also be replaced by cables. In the situation shown in Fig. 2, the excavator is in working state i. At this time, the boom 30 is rotated around the hinge point A to extend forward, and the gravity moment of the boom is maximum. Correspondingly, at this time, the weight body 60 is rotated around the hinge point B by the lever arm 62 and extended backward, and the center of gravity is moved backward, so that the balance weight of the weight body is maximized to offset the gravity moment of the arm as much as possible. Referring to Figures 3-5, the situation when the excavator according to the first embodiment of the present invention is in another working state is shown, respectively. As shown in Figure 3, the excavator is in working state two. At this time, the boom 30 rotates around the hinge point A and lifts up, the center of gravity moves backward, and the gravity moment of the boom is the smallest. Correspondingly, the lever arm 62 rotates around the hinge point B, the weight body 60 falls and retracts, and comes into contact with the tail end of the slewing platform 20, so the center of gravity moves forward, which is compatible with the minimum moment of gravity of the boom. At this moment, the balance weight of the weight body It is also the smallest, and the position of the center of gravity is approximately at the same horizontal position as the hinge point B. As shown in Figure 4, the excavator is in working state III. At this time, the position of the center of gravity of the boom is at ¾ shown in Figs. 2 and 3; the excavator is between the positions of the center of gravity of the first and second working states. Correspondingly, the position of the center of gravity of the weight body is also between the position of the center of gravity of the weight of the excavator shown in FIGS. 2 and 3 in the first and second working states. As shown in Figure 5, the excavator is in working state IV. At this time, the digging mechanism of the excavator performs the digging work at a deeper position lower than the ground, and the boom 30 is further rotated counterclockwise from the position of the working state one, and its position of the center of gravity is moved backward from the position of the center of gravity at the time of the working state. On the contrary, the moment of gravity of the arm is smaller than the working state. Correspondingly, the weight body 60 rotates counterclockwise with the lever arm 62, and its position of the center of gravity moves up and forwards momentarily than in the working state, so that the balance moment of the weight body is also smaller than that in the working state. Therefore, in this first embodiment, when the center of gravity of the boom is moved forward, the center of gravity of the weight body is moved backward, and when the center of gravity of the boom is moved back, the center of gravity of the weight body is moved backward. Preferably, the balance weight moment of the weight body is equal to the gravity moment of the boom. In addition, in the first embodiment of the present invention, the torque balancing device uses a lever principle to mount a weight body originally fixed on the tail of the excavator to the lower part of the lever arm, and the upper part of the lever arm is connected to the boom with a link or a wire rope. . When the boom is lowered, the forearm is at the forefront, and the overall force arm of the boom and forearm is lengthened, and the overall gravity moment is increased. The weight of the boom and forearm is used to pull up the weight body. Then, the excavator's forearm digs the soil. After the excavation, the forearm is folded back, the working position of the forearm changes, the overall force arm of the boom and forearm becomes shorter, and the overall gravity moment becomes smaller. When the boom needs to be raised, Pull up the boom by the weight of the weight. This can achieve a better torque balance effect. Referring to FIG. 6, a schematic structural diagram of an excavator according to a second embodiment of the present invention is shown. Different from the first embodiment, a pulley 67 is provided on the bracket 66 at the tail of the rotary platform 20, and the weight body 60 is connected to the upper end of the fixing plate 32 on the boom 30 through the cable 68 and the pulley 67. In this case, the weight of the weight body acts on the boom 32 through the cable 68 to form a balance weight moment of the weight body to offset at least part of the weight moment of the boom. When the boom 30 rotates around the hinge point A under the action of the boom cylinder 50, the cable 68 pulls the weight body 60 as the boom 30 rotates. The weight body 60 only moves up and down, and does not move back and forth with respect to the rotary platform 20 or the pulley axis C. The above descriptions are merely preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

Claim

An excavator comprising a boom and a slewing platform, wherein the boom is connected to the slewing platform, wherein the excavator further includes a torque balancing device, and the torque balancing device includes a weight body, using The weight body applies a balance moment to the boom in a direction opposite to the gravity moment of the boom.

2. The excavator according to claim 1, wherein the moment balancing device further comprises a bar arm, a middle portion of the lever arm is hinged on the slewing platform, and one end is mounted with the weight body Its other end is directly or indirectly connected to the boom.

3. The excavator according to claim 2, wherein the lever arm is indirectly connected to the boom via a link or a cable.

The excavator according to claim 3, wherein an upright fixing plate is provided on the upper surface of the boom, and one end of the link or cable is connected to the upper end of the fixing plate.

The excavator according to any one of claims 2 to 4, wherein the lever arm is curved.

6. The excavator according to claim 1, wherein the moment balancing device further comprises a pulley and a cable, the pulley is mounted on the rotary platform, and the weight body passes the cable to bypass the pulley Connected to the boom.

7. The excavator according to claim 6, wherein an upright fixing plate is provided on the upper surface of the boom, and one end of the cable is connected to the upper end of the fixing plate.

8. The excavator according to claim 1, wherein when the center of gravity of the boom is moved forward, the center of gravity of the weight body is moved backward, and when the center of gravity of the boom is moved backward, the weight of the weight body Center of gravity moves forward.

9. The excavator according to claim 2, wherein the balance body moment of the counterweight is equal to the moment of gravity of the boom. The excavator according to claim 1, wherein when the center of gravity of the boom moves back and forth, the center of gravity of the weight does not move back and forth.