ES2905182T3 - A Counterweight Lift Arm Mechanism for Knuckle Boom Cranes - Google Patents

Abstract

A lifting arm mechanism (100) that is mounted on a main body of the crane (101) to allow the movement of a counterweight (106), comprising, - a main arm (102) that is in connection with said body main arm of the crane (101) and a support arm (103) for transmission of movement, - said support arm (103) which is connected to the main arm (102) at one end and allows the counterweight (106) to be positioned ) on the other side, and transmits the movement, - cylinders for the counterweight (104) that are in connection with said main arm (102) and said support arm (103) to transmit the required actuation to the main arm (102) and to the support arm (103), - said main arm (102) and said support arm (103) can move along an X axis (X) and a Y axis (Y) by means of said cylinders for the counterweight (104) to allow said counterweight (106) to move along said X axis (X) and said Y axis (Y), characteri ized because it comprises, - a counterweight cavity (103.1) that extends into the support arm (103) to prevent said counterweight (106) from hitting the support arm (103) when it is raised to its maximum height.

Description

DESCRIPTION

A Counterweight Lift Arm Mechanism for Knuckle Boom Cranes

technical field

The invention generally relates to a lifting arm mechanism for lifting counterweight assemblies used to support the balance of knuckle boom cranes.

The invention relates in particular to a lifting arm mechanism for lifting the counterweight assembly used to support the balance of the load being lifted on knuckle boom cranes.

prior art

In currently used knuckle boom cranes, the counterweight assemblies used to balance the hoisted weight are attached to the crane body. These counterweight assemblies attached to the crane body cannot move along the horizontal and vertical directions. They can only rotate 360 degrees together with the crane body they are attached to.

In prior art luffing jib knuckle boom cranes, the luffing jib remains in the body when not mounted. When the crane is operated on its axis around the center, the movement of the counterweight assembly connected to the crane body hits the luffing jib and the crane cannot rotate. Since the aforementioned counterweight assembly lacks the ability to move in horizontal and vertical directions, it is necessary to remove the luffing jib from the frame. Removing the luffing jib from the frame requires the use of a forklift or crane.

Due to these problems found in the state of the art, time and labor are lost. Due to the necessary means to be used to remove the luffing jib from the vehicle, economic losses occur.

Regarding the study of patents of the prior art, the technical content of application no. TR2010/06277 refers to knuckle boom cranes designed as construction machinery for commercial use and used for hoisting when mounted on commercial vehicles such as trucks. It comprises front and rear inner casings which may have vertically moving pistons which move the fixing stabilizers, which come into contact with the ground, in the vertical direction, front and rear outer casings through which the front and rear inner casings perform a linear movement, bases that provide support to the front and rear outer casings that perform a linear movement, a frame to which the bases are fixed and a tower that rotates 360° around the turning ring inserted on the frame that is ride in the truck.

In relation to the study of patents of the prior art, as seen in the technical content of patent application no. TR2010/06277, movement of the counterweight along the horizontal and vertical axes is not provided. Therefore, jamming by the luffing jib and interference with operation remains a concern.

Looking at prior art patent study, document US2007/122261 discloses the preamble of claim 1. More in detail, it discloses an apparatus for separating and attaching a counterweight. The counterweight described in US2007/122261 is selectively raised and lowered with respect to the frame by rotating a second connecting section via a second drive portion. There is no teaching in US2007/122261 to motivate the skilled person to solve the problem of hitting the luffing nib by moving it along the X-axis and Y-axis.

With respect to prior art patent study, JPS4977341A discloses a movable counterweight that is provided for flatness and balance of a crane boom. As understood from the description and figures of JPS4977341A during the driving position, the described design cannot change the center of gravity of the excavator with the change of position of the counterweight. With the present invention, during the driving position, the axle weight distribution can be controlled by transposition of the counterweights in the counterweight pools located on the rear side of the truck cab. On the other hand, while in working position, with the same counterweight there will be more counter moment within the distance between the counterweight and the center of rotation.

With respect to prior art patent study, JPH08333776A discloses a counterweight mounting/removing device. It is necessary to change the center of gravity to distribute the weight. During the driving position, the device described in JPH08333776A cannot change the center of gravity of the excavator with the change of position of the counterweight.

Therefore, developments in the counterweight lifting arm mechanism are required, and new embodiments are needed that overcome the above mentioned disadvantages and provide a solution for current systems.

Description of the invention

The invention relates to a lifting arm mechanism that meets all the above requirements, overcomes all the disadvantages and provides additional advantages.

The main object of the invention is to ensure operation without being blocked by the luffing jib by allowing the counterweight assembly to move along horizontal and vertical axes by means of the lift arm mechanism.

An object of the invention is to allow the assembly of counterweights to be raised.

Another object of the invention is to eliminate the need to remove the luffing jib from the frame.

Another object of the invention is to avoid wasted time, wasted labor and wasted money by eliminating the need to use machinery such as forklifts and cranes to remove the luffing jib from the frame.

An object of the invention is to aid in load balancing by allowing the counterweight assembly to move along horizontal and vertical axes.

In order to realize the advantages that are mentioned above and that can be deduced from the detailed description below, the invention is a lifting arm mechanism that is mounted on the main body of a crane to allow the movement of a counterweight, where; comprises a main arm that is in connection with said main body of the crane and the support arm for the transmission of movement, the support arm that is connected to the main arm at one end and that allows the counterweight to be positioned on the other side , and transmits motion and drive members connecting to said main arm and said support arm to transmit the required drive to the main arm and support arm.

The structural and characteristic elements and all the advantages of the invention will become apparent from the accompanying drawings and the detailed description with reference to these drawings. Therefore, the evaluation must be based on these drawings and the detailed description.

Brief description of the drawings

The embodiment of the present invention and its advantages with other elements will become apparent with reference to the drawings explained below.

Figure 1 is a two-dimensional side view of the lift arm mechanism of the invention.

Figure 2 is the other two-dimensional side view of the lifting arm mechanism of the invention.

Figure 3 is a two-dimensional side view of the counterweight 106 of the inventive lift arm mechanism at maximum height.

number of parts

100- Lift Arm Mechanism

101- Main body of the crane

102- Main arm

103- Support arm

103.1- Counterweight cavity

104- Counterbalance cylinders

105- Connector

106- Counterweight

107- Middle Support Member

D: Axis of rotation of the crane

X: X axis

Y: Y axis

Detailed description of the invention

A two-dimensional side view of the lift arm mechanism (100) of the invention is depicted in Figure 1. The lift arm mechanism 100 of the invention allows the counterweight 106 to operate without hitting the luffing jib, by moving it along the X-axis (X) and the Y-axis (Y).

Another two-dimensional side view of the lift arm mechanism (100) of the invention is shown in Figure 2. The invention relates to a lifting arm mechanism (100) that is mounted on the main body of the crane (101) to allow movement of the counterweight (106). A main arm (102) that provides the transmission of movement by being connected to said main body of the crane (101) and to the support arm (103). You enter the support arm (103) that connects to the main arm (102) at one end and allows the counterweight (106) to be positioned on the other side, and transmits movement. The required drive is delivered to the main arm (101) and the support arm (103) through counterweight cylinders (104), which are connected to said main arm (101) and said support arm (103). A counterweight cavity (103.1) extends into the support arm (103) to prevent the counterweight (106) from hitting the support arm (103) when raised to the maximum height. Said counterweight cavity (103.1) can be opened 90 degrees to fit the corner of the counterweight (106). The intermediate support members (107) ensure that the main arms (102) and the support arms (103) work in synchrony and improve the strength of the lifting arm mechanism (100). Said intermediate support members (107) are preferably tube-shaped. A connector (105) connects to the support arm (103) in order to provide a positioning surface for said counterweight (106).

Figure 3 represents a two-dimensional side view of the counterweight (106) of the lift arm mechanism (100) of the invention at maximum height.

The operating principle of the lifting arm mechanism (100) of the invention is as follows;

The main arms (102) that connect to the main body of the crane (101) that rotates around the rotation axis of the crane (D), move along the X axis (X) and the Y axis (Y) by means of counterweight cylinders. (104). The support arms (103) connecting to said main arms (102) move along the X-axis (X) and the Y-axis (Y) by means of the counterweight cylinders (104). Intermediate support members (107) are introduced to ensure that said main arms (102) and support arms (103) work in synchrony and improve the strength of the lifting arm mechanism (100). The counterweight cylinders (104) driving these main arms (102) and support arms (103) allow the counterweight (106) to move along the X-axis (X) and the Y-axis (Y).

Claims (1)

A lifting arm mechanism (100) that is mounted on a main body of the crane (101) to allow the movement of a counterweight (106), comprising, - a main arm (102) that is in connection with said main body of the crane (101) and a support arm (103) for transmission of movement, - said support arm (103) which is in connection with the main arm (102) at one end and allows the counterweight (106) to be positioned at the other end, and transmits the movement, - cylinders for the counterweight (104) that are in connection with said main arm (102) and said support arm (103) to transmit the required drive to the main arm (102) and to the support arm (103), - said arm (102) and said support arm (103) can move along an X axis (X) and a Y axis (Y) by means of said cylinders for the counterweight (104) to allow said counterweight (106) moves along said X axis (X) and said Y axis (Y), characterized in that it comprises, - a counterweight cavity (103.1) extending inside the support arm (103) to prevent said counterweight (106) from hitting the support arm (103) when it is raised to the maximum height. The lifting arm mechanism (100) according to claim 1, comprising intermediate support elements (107) that ensure that said main arm (102) and the support arm (103) work in synchrony and improve the resistance of the lift arm mechanism (100). The lift arm mechanism (100) according to claim 1, comprising a connector (105) connecting to the support arm (103) to provide a locating surface for said counterweight (106). The lifting arm mechanism (100) according to any one of claims 1 to 3, wherein said crane main body (101) is rotatable about a crane rotation axis (D).