Middle lifting type three-arm seat

Abstract

The utility model relates to the technical field of drilling and digging equipment, and provides a middle lifting type three-arm arm seat which is characterized in that one end of a first pull rod is hinged with a pull rod support arranged in a frame, the other end of the first pull rod is hinged with one end of a connecting rod, one end of a second pull rod is hinged with the other end of the connecting rod, and the other end of the second pull rod is hinged with a middle arm seat; one end of the first lifting arm is hinged to the large arm seat, the other end of the third pull rod is hinged to the middle of the second lifting arm, the other end of the first lifting arm, one end of the second lifting arm and the connecting rod are hinged to the same position through a connecting shaft, the connecting shaft is arranged in the middle of the connecting rod, and the other end of the second lifting arm is hinged to the middle arm seat. A lifting oil cylinder is hinged to the frame through an oil cylinder support, a piston rod of the lifting oil cylinder is hinged to the middle of the first lifting arm, linear stretching of the lifting oil cylinder is converted into lifting of the middle arm seat through a transmission chain of a first pull rod, a connecting rod and a second pull rod, and amplification of the lifting stroke of the oil cylinder is achieved.

Description

Technical Field

[0001] This utility model relates to the field of drilling equipment technology, and more specifically, to a centrally lifting three-arm support. Background Technology

[0002] In the field of drilling equipment, the three-arm boom mount, as a key platform for mounting the boom on a three-arm trolley, directly affects the construction performance of the equipment. Fixed to the chassis, the three-arm boom mount allows for the installation of three booms on the front. By expanding the working area and enabling multi-arm coordinated operation, it effectively improves construction efficiency and shortens construction time, making it of significant application value in large-section construction scenarios such as tunnel excavation and mining.

[0003] However, existing three-arm boom systems lack sufficient capacity to increase the boom's lifting height. Traditional boom systems typically employ simple single-stage linkages or direct drive mechanisms, which prevents the extension and retraction stroke of the lifting cylinders from being effectively amplified through the geometric characteristics of the linkage mechanism. This limits the boom's lifting height to the cylinder's own stroke range, making it difficult to meet the demands for higher working heights in large-section construction. This limitation directly results in the boom's inability to reach higher working areas during construction, especially in scenarios such as tunnel excavation and mining that require covering large construction areas. Frequent adjustments to the equipment position or the use of other auxiliary devices are necessary to complete the work, increasing construction time and costs. Furthermore, equipment positioning errors may affect construction accuracy and reduce overall construction efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a centrally lifting three-arm boom support, which solves the problem that existing three-arm boom supports are insufficient in supporting the lifting height of the boom and cannot meet the higher working height requirements of large-section construction.

[0005] This utility model is achieved through the following technical solution: a three-arm support with intermediate lifting mechanism, comprising a first pull rod, a connecting rod, a second pull rod, a third pull rod, a first lifting arm, a second lifting arm, an intermediate arm support, and a boom support mounted on a vehicle frame. One end of the first pull rod is hinged to a pull rod support mounted inside the vehicle frame, and the other end of the first pull rod is hinged to one end of a connecting rod. One end of the second pull rod is hinged to the other end of a connecting rod and the other end of the second pull rod is hinged to the intermediate arm support. One end of the third pull rod is hinged to the boom support, and the other end of the third pull rod is hinged to the middle of the second lifting arm. One end of the first lifting arm is hinged to the boom support. The other end of the first lifting arm, one end of the second lifting arm, and the connecting rod are hinged to the same location via a connecting shaft located in the middle of the connecting rod. The other end of the second lifting arm is hinged to the intermediate arm support. A lifting cylinder is hinged to the vehicle frame via a cylinder support, and the piston rod of the lifting cylinder is hinged to the middle of the first lifting arm.

[0006] Furthermore, the hinge points of the boom base and the first lifting arm, the hinge points of the first tie rod and the tie rod support, the hinge points of the first tie rod and the connecting rod, and the hinge points of the first lifting arm and the connecting rod are connected in sequence to form a parallelogram.

[0007] Furthermore, the hinge points of the second lifting arm and the connecting rod, the hinge points of the connecting rod and the second tie rod, the hinge points of the second tie rod and the intermediate arm seat, and the hinge points of the intermediate arm seat and the second lifting arm are connected in sequence to form a parallelogram.

[0008] Furthermore, the boom mount, tie rod support, and cylinder support are all bolted to the frame.

[0009] Furthermore, the intermediate arm base is provided with mounting holes for connecting the main arm.

[0010] Furthermore, the first, second, and third tie rods are all made of high-strength aluminum alloy.

[0011] Furthermore, the lifting cylinder is a double-acting hydraulic cylinder.

[0012] This utility model has at least the following advantages and beneficial effects:

[0013] (1) Through the three-stage transmission chain of the first tie rod, the connecting rod and the second tie rod, the linear extension and retraction of the lifting cylinder is converted into the lifting motion of the intermediate boom seat, thereby amplifying the lifting stroke and solving the problem that the lifting height of the traditional boom seat is limited by the cylinder stroke.

[0014] (2) A parallelogram mechanism is formed by the boom seat, the first lifting arm, the connecting rod and the first tie rod, and another parallelogram mechanism is formed by the connecting rod, the second lifting arm, the intermediate arm seat and the second tie rod, forming a double closed-loop transmission chain, which significantly improves the rigidity of the overall structure and the stability of the transmission. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a three-arm support with intermediate lifting mechanism provided by this utility model.

[0016] Figure 2 A side view of a three-arm support with intermediate lifting mechanism provided by this utility model.

[0017] Figure 3 A mid-section view of a three-arm support with intermediate lifting mechanism provided by this utility model.

[0018] Figure 4 This is a structural schematic diagram of another state of a three-arm support with intermediate lifting mechanism provided by this utility model.

[0019] Figure 5 A schematic diagram of the lifting trajectory of a middle lifting three-arm support provided by this utility model.

[0020] Reference numerals: 1-First tie rod, 2-Connecting rod, 20-Connecting shaft, 3-Second tie rod, 4-Third tie rod, 5-First lifting arm, 6-Second lifting arm, 7-Intermediate arm seat, 70-Mounting hole, 8-Frame, 80-Lifting cylinder, 81-Tie rod support, 82-Cylinder support, 9-Large arm seat. Detailed Implementation

[0021] The specific implementation method is described below with reference to the accompanying drawings.

[0022] Example

[0023] like Figures 1 to 5 As shown, in this embodiment, a middle lifting three-arm support is disclosed, the main structure of which includes a first pull rod 1, a connecting rod 2, a second pull rod 3, a third pull rod 4, a first lifting arm 5, a second lifting arm 6, a middle arm support 7, and a large arm support 9 mounted on the frame 8.

[0024] Among them, one end of the first tie rod 1 is hinged to the tie rod support 81 provided in the frame 8, and the other end of the first tie rod 1 is hinged to one end of the connecting rod 2. One end of the second tie rod 3 is hinged to the other end of the connecting rod 2 and the other end of the second tie rod 3 is hinged to the intermediate arm seat 7. One end of the third tie rod 4 is hinged to the boom seat 9 and the other end of the third tie rod 4 is hinged to the middle of the second lifting arm 6. One end of the first lifting arm 5 is hinged to the boom seat 9. The other end of the first lifting arm 5, one end of the second lifting arm 6, and the connecting rod 2 are hinged to the same place through the connecting shaft 20, which is located in the middle of the connecting rod 2. The other end of the second lifting arm 6 is hinged to the intermediate arm seat 7. The frame 8 is hinged to the lifting cylinder 80 through the cylinder support 82. The piston rod of the lifting cylinder 80 is hinged to the middle of the first lifting arm 5. Through a three-stage transmission chain consisting of the first pull rod 1, connecting rod 2, and second pull rod 3, the linear extension and retraction of the lifting cylinder 80 is converted into the lifting motion of the intermediate arm seat 7. Compared to the single-stage drive technology of the prior art, this achieves a geometric amplification of the lifting stroke. For example, when the lifting cylinder 80 extends a certain length, the translation of the connecting rod 2 and the rotation of the first lifting arm 5 and the second lifting arm 6 will superimpose to amplify the lifting height of the intermediate arm seat 7, solving the problem that the lifting height of the traditional arm seat is limited by the cylinder stroke. It should be noted that the line connecting the axis of the connecting shaft 20, the hinge point of the first pull rod 1 and the connecting rod 2, and the hinge point of the second pull rod 3 and the connecting rod 2 forms an isosceles trapezoidal structure. The first lifting arm 5, the second lifting arm 6, and the connecting rod 2 are hinged to the middle of the connecting rod 2 through the same connecting shaft 20, forming a "three-bar coaxial" structure, which reduces the number of independent hinge points, simplifies the mechanical structure, and ensures motion synchronization. For example, when the first lifting arm 5 rotates upward, it directly drives the connecting rod 2 and the second lifting arm 6 through a coaxial connection, avoiding transmission lag or jamming. The lifting cylinder 80 is hinged to the middle of the frame 8 and the first lifting arm 5, and uses the lever principle to amplify the driving force, allowing the first lifting arm 5 to obtain a larger rotational torque. Especially in the initial stage of lifting (when the piston rod of the lifting cylinder 80 is not fully extended), it can overcome the initial load with a smaller hydraulic pressure, improving starting efficiency. The third tie rod 4 is hinged to the middle of the boom seat 9 and the second lifting arm 6, acting as a stabilizer to counteract lateral forces, preventing the second lifting arm 6 from swaying during lifting and ensuring the stability of the transmission path.

[0025] Furthermore, in specific implementation, the hinge points of the boom seat 9 and the first lifting arm 5, the hinge points of the first pull rod 1 and the pull rod support 81, the hinge points of the first pull rod 1 and the connecting rod 2, and the hinge points of the first lifting arm 5 and the connecting rod 2, as provided in this embodiment of the utility model, are sequentially connected to form a parallelogram. Specifically, as shown... Figure 5As shown, the parallelogram mechanism consisting of the boom seat 9, the first lifting arm 5, the first tie rod 1, and the connecting rod 2 restricts the movement trajectory of the connecting rod 2, preventing the intermediate boom seat 7 from tilting or swaying due to the swing of the connecting rod 2. The geometric characteristics of the parallelogram mechanism, with parallel and equal sides, allow the connecting rod 2 to perform translational motion rather than rotation when the first lifting arm 5 rotates, thus amplifying the stroke of the lifting cylinder 80.

[0026] Furthermore, in specific implementation, the hinge points of the second lifting arm 6 and connecting rod 2, the hinge points of the connecting rod 2 and the second pull rod 3, the hinge points of the second pull rod 3 and the intermediate arm seat 7, and the hinge points of the intermediate arm seat 7 and the second lifting arm 6, as provided in this embodiment of the present invention, are sequentially connected to form a parallelogram. Specifically, the parallelogram mechanism composed of the second lifting arm 6, connecting rod 2, second pull rod 3, and intermediate arm seat 7 ensures that the intermediate arm seat 7 remains vertical during the lifting process. For example, when the second lifting arm 6 rotates upward, the second pull rod 3 pulls the intermediate arm seat 7 to rise synchronously through the translational characteristics of the parallelogram, and the mounting surface of the intermediate arm seat 7 always remains vertical, avoiding deviations in the drilling angle caused by tilting after the main arm is installed. The two parallelogram mechanisms mentioned above form a "double closed-loop" transmission chain (first closed loop: boom seat 9, first lifting arm 5, connecting rod 2 and first tie rod 1; second closed loop: connecting rod 2, second lifting arm 6, intermediate arm seat 7 and second tie rod 3), which significantly improves the rigidity of the overall structure.

[0027] Furthermore, in specific implementation, the boom support 9, tie rod support 81 and cylinder support 82 provided in this utility model embodiment are all bolted to the frame 8, which facilitates quick disassembly and reassembly during equipment installation, debugging or maintenance.

[0028] Furthermore, in a specific implementation, the intermediate arm seat 7 provided in this utility model embodiment is provided with mounting holes 70 for connecting the main arm, which can be adapted to the installation requirements of different types of rock drilling main arms.

[0029] Furthermore, in specific implementations, the first pull rod 1, the second pull rod 3, and the third pull rod 4 provided in this utility model embodiment are all made of high-strength aluminum alloy material, such as 6061-T6 or 7075-T6 series.

[0030] Furthermore, in specific implementations, the lifting cylinder 80 provided in this embodiment of the present invention is a double-acting hydraulic cylinder. Specifically, the double-acting hydraulic cylinder can adopt existing technology, using a hydraulic system to control the extension and retraction of the piston rod respectively, thereby realizing the raising and lowering of the intermediate arm seat 7.

Claims

1. An intermediate lift three-arm cradle characterized by, It includes a first tie rod (1), a connecting rod (2), a second tie rod (3), a third tie rod (4), a first lifting arm (5), a second lifting arm (6), an intermediate boom seat (7), and a boom seat (9) mounted on the frame (8); One end of the first pull rod (1) is hinged to the pull rod support (81) provided inside the frame (8), and the other end of the first pull rod (1) is hinged to one end of the connecting rod (2). One end of the second pull rod (3) is hinged to the other end of the connecting rod (2), and the other end of the second pull rod (3) is hinged to the intermediate arm seat (7). One end of the third pull rod (4) is hinged to the boom seat (9), and the other end of the third pull rod (4) is hinged to the middle of the second lifting arm (6). The first lifting arm (5) is... The first lifting arm (5) is hinged to the boom seat (9). The other end of the first lifting arm (5), one end of the second lifting arm (6), and the connecting rod (2) are hinged to the same place through the connecting shaft (20). The connecting shaft (20) is located in the middle of the connecting rod (2). The other end of the second lifting arm (6) is hinged to the intermediate arm seat (7). The frame (8) is hinged to the lifting cylinder (80) through the cylinder support (82). The piston rod of the lifting cylinder (80) is hinged to the middle of the first lifting arm (5).

2. An intermediate lift three-arm cradle as claimed in claim 1, wherein, The hinge points of the boom seat (9) and the first lifting arm (5), the hinge points of the first pull rod (1) and the pull rod support (81), the hinge points of the first pull rod (1) and the connecting rod (2), and the hinge points of the first lifting arm (5) and the connecting rod (2) are connected in sequence to form a parallelogram.

3. An intermediate lift three-arm cradle as claimed in claim 2, wherein, The hinge points of the second lifting arm (6) and the connecting rod (2), the hinge points of the connecting rod (2) and the second pull rod (3), the hinge points of the second pull rod (3) and the intermediate arm seat (7), and the hinge points of the intermediate arm seat (7) and the second lifting arm (6) are connected in sequence to form a parallelogram.

4. An intermediate lift three-arm cradle as claimed in claim 1, wherein, The boom mount (9), the tie rod support (81), and the cylinder support (82) are all bolted to the frame (8).

5. An intermediate lift three-arm cradle as claimed in claim 1, wherein, The intermediate arm base (7) is provided with mounting holes (70) for connecting the main arm.

6. An intermediate lift three-arm cradle as claimed in claim 1, wherein, The first pull rod (1), the second pull rod (3) and the third pull rod (4) are all made of high-strength aluminum alloy.

7. An intermediate lift three-arm cradle as claimed in claim 1, wherein, The lifting cylinder (80) is a double-acting hydraulic cylinder.

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