Excavator and working device thereof

Abstract

The utility model relates to an excavator, in particular to an excavator and a working device thereof, the working device of the excavator comprises a movable arm, a bucket rod arranged at the front end of the movable arm, a bucket rod oil cylinder, a variable-amplitude oil cylinder and a variable-amplitude rocker arm, the end part of the upper end of the bucket rod is connected with the front end part of the movable arm through a pin shaft; the variable-amplitude rocker arm is rotationally mounted on the movable arm through a rocker arm pin shaft; the front end of the variable-amplitude oil cylinder is connected with the first end of the variable-amplitude rocker arm, and the rear end of the variable-amplitude oil cylinder is connected with the movable arm; the front end of the bucket rod oil cylinder is connected with the bucket rod, and the rear end of the bucket rod oil cylinder is connected with the second end of the variable amplitude rocker arm. The variable-amplitude rocker arm can be pushed by the variable-amplitude oil cylinder to rotate, so that the position of the rear end of the bucket rod oil cylinder is changed, the distance between an accessory and a main machine is increased when the bucket rod swings back to the limit position, the variable-amplitude oil cylinder can be retracted, the rear end of the bucket rod oil cylinder is moved backwards during transportation of the excavator, the back-swinging amplitude of the bucket rod is increased, and transportation is facilitated.

Description

Technical Field

[0001] This utility model relates to an excavator, and more specifically, to an excavator and its working device. Background Technology

[0002] The working device of the excavator includes a boom connected to the rear end of the slewing platform, a stick installed at the front end of the boom, and attachments installed at the end of the stick. A boom cylinder is connected between the boom and the slewing platform. The boom cylinder extends and retracts to support the boom to swing up and down around the rear end of the boom. A stick cylinder is connected between the stick and the boom. The stick extends and retracts to push the stick to swing back and forth around its upper end.

[0003] In existing excavator working devices, the stick cylinder is directly connected to the boom, with a fixed hinge point. When the stick cylinder retracts to its shortest position, the angle between the stick and the boom is at its lowest. For conventional excavators, the size design can ensure that the boom is raised to its highest point and the extension does not collide with the main unit, such as the slewing platform or the cab, when the boom is raised to its highest position and the stick is retracted to its limit. However, for extra-long boom excavators, because their boom and stick are longer than those of conventional excavators, according to conventional design, when the boom is raised to its highest position and the stick is retracted to its limit, the extension may collide with the slewing platform or the cab, thus creating a safety hazard. Utility Model Content

[0004] The technical problem to be solved by this utility model is that excavators with extra-long booms may collide with the main unit, and this utility model provides an excavator and its working device.

[0005] The technical solution of this utility model to achieve its purpose is: an excavator working device, including a boom, a stick installed at the front end of the boom, a stick cylinder, and a luffing cylinder and a luffing rocker arm. The upper end of the stick is connected to the front end of the boom by a pin, and the luffing rocker arm is rotatably installed on the boom by a rocker arm pin.

[0006] The front end of the luffing cylinder is connected to the first end of the luffing rocker arm, and the rear end is connected to the boom.

[0007] The front end of the boom cylinder is connected to the boom, and the rear end is connected to the second end of the luffing rocker arm.

[0008] In the excavator working device of this utility model, the boom cylinder, the luffing cylinder and the luffing rocker arm are all arranged in pairs.

[0009] The two luffing rocker arms are respectively arranged on both sides of the boom and connected to both ends of the rocker arm pin; each luffing rocker arm is connected to one boom cylinder and one luffing cylinder.

[0010] The excavator working device of this utility model also includes a connecting rod, the two ends of which are fixedly connected to the two luffing rocker arms.

[0011] In the excavator working device of this utility model, the first end, the second end, and the rocker arm pin are arranged in a triangle.

[0012] In the excavator working device of this utility model, the first end and the second end of the luffing rocker arm are located on the same side of the straight line between the rocker arm pin and the rear hinge point of the luffing cylinder, and also on the same side of the straight line between the rocker arm pin and the front hinge point of the stick cylinder. Further, the first end and the second end of the luffing rocker arm are located above the straight line between the rocker arm pin and the rear hinge point of the luffing cylinder, and also above the straight line between the rocker arm pin and the front hinge point of the stick cylinder.

[0013] In the excavator working device of this utility model, the rocker arm pin is rotatably connected to the boom, and the luffing rocker arm is fixedly connected to the rocker arm pin.

[0014] In the excavator working device of this utility model, the distance from the rocker arm pin to the first end on the variable amplitude rocker arm is greater than the distance from the rocker arm pin to the second end.

[0015] In the excavator working device of this utility model, each of the luffing rocker arms is a double-plate structure, and the corresponding ends of the stick cylinder and the luffing cylinder are located between the two plates of the luffing rocker arm.

[0016] The technical solution of this utility model to achieve its purpose is: an excavator having the aforementioned excavator working device.

[0017] Compared with the prior art, this utility model can drive the luffing boom to rotate through the luffing cylinder, thereby changing the position of the rear end of the stick cylinder. When the stick swings back to its limit position, it increases the distance between the attachment and the main machine. When the excavator is transporting, the luffing cylinder can be retracted to move the rear end of the stick cylinder backward, thereby increasing the swing amplitude of the stick and facilitating transportation. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the excavator of this utility model.

[0019] Figure 2 This is a schematic diagram of the connection structure of the boom cylinder of the excavator working device according to this utility model.

[0020] Figure 3 This is an exploded view of the connection structure of the boom cylinder of the excavator working device according to this utility model.

[0021] Component names and serial numbers in the diagram:

[0022] Excavator main unit 10, boom 11, stick 12, attachments 13, luffing arm 14, stick cylinder 15, luffing cylinder 16, front pin of stick cylinder 17, rocker arm pin 18, rear pin of luffing cylinder 19, rear pin of stick 20. Detailed Implementation

[0023] The specific implementation plan is described below with reference to the attached diagram.

[0024] like Figure 1 As shown, the excavator's working device includes a boom 11, a stick 12 mounted at the front end of the boom 11, a stick cylinder 15, a luffing cylinder 16, and a luffing rocker arm 14. The upper end of the stick 12 is connected to the front end of the boom 11 via a pin. The luffing rocker arm 14 is rotatably mounted on the boom 11 via a rocker arm pin 18. The front end of the luffing cylinder 16 is connected to the first end of the luffing rocker arm 14, and the rear end is connected to the boom 11. The front end of the stick cylinder 15 is connected to the stick 12, and the rear end is connected to the second end of the luffing rocker arm 14. When the stick cylinder extends or retracts, it pushes the stick to swing back and forth around the rear end pin 20 of the stick.

[0025] In this embodiment, the extension and retraction of the luffing cylinder 16 pushes the luffing rocker arm 14 to rotate around the rocker arm pin 18. The second end of the luffing rocker arm 14 also drives the rear end of the stick cylinder 15 to move back and forth, which is equivalent to adjusting the installation position of the stick cylinder 15 on the boom. During operation, rotating the second end of the luffing rocker arm 14 forward can increase the minimum angle between the stick 12 and the boom 11, which can prevent the attachment 13 at the end of the stick 12 from colliding with the excavator host 10. In transport conditions, rotating the second end of the luffing rocker arm 14 backward can reduce the minimum angle between the stick 12 and the boom 11, so that the stick 12 and the boom 11 will be very close, thereby ensuring a lower transport height.

[0026] Optionally, such as Figure 3 As shown, the boom cylinder 15, luffing cylinder 16, and luffing rocker arm 14 are all arranged in pairs. The two luffing rocker arms 14 are respectively arranged on both sides of the boom 11 and connected to both ends of the rocker arm pin 18; the first end and the second end of each luffing rocker arm 14 are connected to one luffing cylinder and one boom cylinder respectively.

[0027] Optionally, the luffing rocker arms 14 located on both sides of the boom 11 can also be fixedly connected by a connecting rod (not shown in the figure), with both ends of the connecting rod fixedly connected to the luffing rocker arms 14. The connecting rod connects the two luffing rocker arms 14, making the luffing rocker arms 14 on both sides rigid bodies with stronger strength, while also ensuring the synchronicity of the rotation of the luffing rocker arms 14 on both sides.

[0028] Optionally, the first end, the second end, and the rocker arm pin 18 of the variable amplitude rocker arm 14 are arranged in a triangle.

[0029] like Figure 2 Figure 3 As shown, the luffing rocker arm 14 is rotatably mounted at point A via the rocker arm pin 18. The first end of the luffing rocker arm 14 is hinged to the front end of the luffing cylinder 16 at point C. The second end of the luffing rocker arm 14 is hinged to the front end of the boom cylinder 15 at point B. The rear end of the luffing cylinder 16 is mounted at point E of the boom 11 via the rear end pin 19 of the luffing cylinder. The front end of the boom cylinder 15 is hinged to point D of the boom 12 via the front end pin 17 of the boom cylinder.

[0030] The first and second ends of the luffing boom 14 are located on the same side of the straight line between the boom pin 18 and the rear hinge point (point E) of the luffing cylinder, and also on the same side of the straight line between the boom pin 18 and the front hinge point (point D) of the stick cylinder. That is, points B and C are on the same side of straight line AE, and also on the same side of straight line AD. Preferably, points B and C are simultaneously located above straight lines AE and AD. When the luffing cylinder retracts to its shortest or longest position, points B and C being on the same side of straight line AE allows for limiting the movement using the luffing cylinder. The fact that points B and C are simultaneously located above straight lines AE and AD provides more clearance below the boom.

[0031] Optionally, the rocker arm pin 18 is rotatably connected to the boom 11, while the luffing rocker arm 14 is fixedly connected to the rocker arm pin 18. The luffing rocker arm 14 is mounted via the rocker arm pin 18, which is rotatably mounted relative to the boom.

[0032] like Figure 2 As shown, the distance from the rocker arm pin 18 on the variable amplitude rocker arm 14 to the first end is greater than the distance from the rocker arm pin 18 to the second end, that is, the length of AB is less than the length of AC.

[0033] like Figure 3 As shown, each luffing rocker arm 14 has a double-plate structure. Each side of the luffing rocker arm 14 consists of two parallel plates. The corresponding ends of the boom cylinder 15 and the luffing cylinder 16 are located between the two plates of the luffing rocker arm 14, and are rotatably connected to the luffing rocker arm 14 by pins.

[0034] like Figure 1 As shown, this embodiment provides an excavator having the aforementioned excavator working device. The excavator main unit 10 can be a wheeled excavator main unit or a tracked excavator main unit, and the excavator attachments can be a bucket, a grab bucket, etc.

[0035] In this embodiment, the excavator and its working device can extend and retract the luffing cylinder 16 to rotate the luffing boom 14, thereby changing the position of the rear end of the stick cylinder 15. When the excavator is in operation, pressurized oil is injected into the large chamber of the luffing cylinder 16, causing it to extend forward. The second end of the luffing boom 14 also pushes forward the rear end of the stick cylinder 15, increasing the angle between the stick 12 and the boom 11. This increases the distance between the attachment 13 and the excavator main body 10 when the stick 12 swings back to its limit position, avoiding the danger of collision between the attachment 13 and the excavator main body 10. During excavator transportation, pressurized oil can be injected into the small chamber of the luffing cylinder 16 to retract the luffing cylinder 16, moving the rear end of the stick cylinder 15 backward, thereby reducing the minimum angle between the stick 12 and the boom 11, and lowering the overall height of the machine during transportation.

Claims

1. An excavator working device, comprising a boom, a stick mounted at the front end of the boom, and a stick cylinder, characterized in that, It also includes a luffing cylinder and a luffing rocker arm. The upper end of the stick is connected to the front end of the boom by a pin, and the luffing rocker arm is rotatably mounted on the boom by a rocker arm pin. The front end of the luffing cylinder is connected to the first end of the luffing rocker arm, and the rear end is connected to the boom. The front end of the boom cylinder is connected to the boom, and the rear end is connected to the second end of the luffing rocker arm.

2. The excavator working device according to claim 1, characterized in that, The boom cylinder, luffing cylinder, and luffing rocker arm are all arranged in pairs. The two luffing rocker arms are respectively arranged on both sides of the boom and connected to both ends of the rocker arm pin; each luffing rocker arm is connected to one boom cylinder and one luffing cylinder.

3. The excavator working device according to claim 2, characterized in that, It also includes a connecting rod, the two ends of which are fixedly connected to the two amplitude rocker arms.

4. The excavator working device according to claim 2, characterized in that, The first end, the second end, and the rocker arm pin of the variable amplitude rocker arm are arranged in a triangle.

5. The excavator working device according to claim 4, characterized in that, The first and second ends of the luffing rocker arm are located on the same side of the straight line between the rocker arm pin and the rear hinge point of the luffing cylinder, and also on the same side of the straight line between the rocker arm pin and the front hinge point of the boom cylinder.

6. The excavator working device according to claim 5, characterized in that, The first and second ends of the luffing rocker arm are located on the upper side of the straight line between the rocker arm pin and the rear hinge point of the luffing cylinder, and simultaneously on the upper side of the straight line between the rocker arm pin and the front hinge point of the boom cylinder.

7. The excavator working device according to claim 1, characterized in that, The rocker arm pin is rotatably connected to the boom, while the variable amplitude rocker arm is fixedly connected to the rocker arm pin.

8. The excavator working device according to any one of claims 1 to 7, characterized in that, The distance from the rocker arm pin to the first end of the variable amplitude rocker arm is greater than the distance from the rocker arm pin to the second end.

9. The excavator working device according to claim 8, characterized in that, Each of the luffing rocker arms has a double-plate structure, with the corresponding ends of the boom cylinder and the luffing cylinder located between the two plates of the luffing rocker arm.

10. An excavator, characterized in that, It has the excavator working device according to any one of claims 1 to 9.

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