Frame type box movable arm and excavator

Abstract

The invention provides a frame type box movable arm and an excavator, and belongs to the technical field of excavators, the frame type box movable arm comprises an upper cover plate, a lower cover plate, a left side plate and a right side plate, the upper cover plate, the lower cover plate, the left side plate and the right side plate are welded and fixed, so that a box structure is defined by the upper cover plate, the lower cover plate, the left side plate and the right side plate, and a supporting frame is arranged in the box structure; the bottom of the supporting frame is fixedly welded to the lower cover plate, and the two sides of the supporting frame are fixedly welded to the left side plate and the right side plate respectively. The stress can be reduced under the condition that the cost and the weight are controlled, the strength of the movable arm is improved, meanwhile, the cracking risk of the movable arm is reduced, and the stability of the excavator in the working process is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of excavator technology, and particularly relates to a frame-type box boom and excavator. Background Technology

[0002] In the field of construction machinery, the excavator boom is the core working component of an excavator, serving as the main lifting arm connecting the excavator's slewing platform and the stick. It forms the foundation of the working device, responsible for supporting the entire front-end working assembly (stick and bucket) and providing the primary lifting force and digging depth. Therefore, the strength of the excavator boom directly affects its reliability, which in turn impacts construction efficiency and cost.

[0003] The existing boom structure consists of a front fork, a central axle seat, a rear axle seat, an upper ear plate, an upper cover plate, a lower cover plate, a left side plate, and a right side plate welded together to form a box structure. In order to ensure strength, the cover plate and side plate are often made of 2-3 plates of different thicknesses welded together. For points with high stress, the stress can only be reduced by increasing the plate thickness. This not only increases the weight of the boom, but also makes it difficult to control the cost. Furthermore, there is a risk of cracking at the weld joints, which cannot guarantee the stability of the excavator during operation. Summary of the Invention

[0004] In view of the defects or deficiencies in the prior art, the present invention provides a frame-type box boom and excavator, which can reduce stress and improve boom strength while controlling cost and weight, and at the same time reduce the risk of boom cracking, thus ensuring the stability of the excavator during operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, embodiments of the present invention provide a frame-type box-type boom, including an upper cover plate, a lower cover plate, a left side plate, and a right side plate. The upper cover plate, lower cover plate, left side plate, and right side plate are welded and fixed together, so that the upper cover plate, lower cover plate, left side plate, and right side plate enclose a box structure. A support frame is provided inside the box structure. The bottom of the support frame is welded and fixed to the lower cover plate, and the two sides of the support frame are welded and fixed to the left side plate and the right side plate, respectively.

[0006] Furthermore, the front end of the housing structure is provided with a front fork for hinged connection with the excavator's boom. The tail end of the front fork is welded and fixed to the upper cover plate, lower cover plate, left side plate, and right side plate respectively to ensure the stability of the connection between the front fork and the housing structure. The rear end of the housing structure is provided with a rear axle seat for hinged connection with the excavator's swing platform. The tail end of the rear axle seat is welded and fixed to the upper cover plate, lower cover plate, left side plate, and right side plate respectively to ensure the stability of the connection between the rear axle seat and the housing structure.

[0007] Furthermore, a central shaft seat is provided in the middle of the box structure for connecting with the boom cylinder. The central shaft seat is located between the left side plate and the right side plate. The left side plate and the right side plate are symmetrically provided with mounting holes. The two ends of the central shaft seat pass through the mounting holes on the left side plate and the right side plate respectively, and are welded and fixed to the left side plate and the right side plate, effectively ensuring the stability of the central shaft seat 8 and the box structure.

[0008] Furthermore, an ear plate is welded and fixed to the middle of the upper surface of the upper cover plate for connection with the boom cylinder.

[0009] Furthermore, the support frame includes a base plate and U-shaped plates. Multiple U-shaped plates are provided, arranged side by side along the length of the base plate, and the bottom ends of the U-shaped plates are welded to the upper surface of the base plate.

[0010] Furthermore, the longitudinal section of the base plate is arc-shaped, which is compatible with the lower cover plate. The lower surface of the base plate can fit against the upper surface of the lower cover plate, and the base plate is welded and fixed to the lower cover plate.

[0011] Furthermore, the width of the base plate is equal to the width between the inner walls of the left and right sides of the plate, and the length of the base plate is equal to the length between the tail end of the front fork and the tail end of the rear axle, so that the base plate does not interfere with the fixed connection between the lower cover plate and the left, right, front fork, and rear axle.

[0012] Furthermore, the U-shaped plate is formed by bending a steel plate and includes a horizontal plate and two vertical plates. The two vertical plates are located at both ends of the horizontal plate and are set perpendicular to the horizontal plate. The top of the vertical plate is connected to the horizontal plate, and the bottom of the vertical plate is welded and fixed to the base plate. The bottom of the vertical plate is provided with a bevel to enhance the welding strength between the vertical plate and the base plate.

[0013] Furthermore, the length of the horizontal plate is equal to the length between the inner walls of the left and right side plates. The outer walls of the two vertical plates are tightly attached to the inner walls of the left and right side plates. The two vertical plates are welded and fixed to the left and right side plates respectively. Stress transmission is achieved by setting a U-shaped plate. The stress can be evenly distributed to the left and right side plates by using the U-shaped plate, so that the stress distribution is uniform.

[0014] Secondly, embodiments of the present invention provide an excavator, including the frame-type boom as described above, wherein the front end of the frame-type boom is hinged to the excavator stick, and the rear end of the frame-type boom is hinged to the excavator slewing platform.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention welds a support frame inside a box structure formed by the upper cover plate, lower cover plate, left cover plate, and right cover plate. The support frame is used to transfer stress and make the stress distribution uniform. At the same time, the support frame is welded and fixed inside the box structure, which effectively improves the overall strength of the boom. The cover plate and side plate do not need to be welded from multiple plates of different thicknesses, which effectively reduces the risk of boom cracking and ensures the stability of the excavator during operation. In addition, the thickness of the upper and lower cover plates and the left and right cover plates can be appropriately reduced to control the weight and cost of the excavator boom.

[0016] 2. In this invention, the width of the base plate is equal to the width between the inner walls of the left and right sides of the plate, and the length of the base plate is equal to the length between the tail end of the front fork and the tail end of the rear axle seat, ensuring that the base plate does not interfere with the fixed connection between the lower cover plate and the left and right sides of the plate, the front fork, and the rear axle seat. Simultaneously, multiple rectangular holes are provided on the upper surface of the base plate, arranged side-by-side along the length of the base plate, effectively reducing its weight. Attached Figure Description

[0017] Figure 1 This is an exploded view of the boom structure in Embodiment 1 of the present invention; Figure 2 This is a structural diagram of the support frame in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the U-shaped plate structure in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the base plate structure in Embodiment 1 of the present invention; Among them, 1. Top cover plate; 101. Ear plate; 2. Bottom cover plate; 3. Left side plate; 4. Right side plate; 401. Mounting hole; 5. Support frame; 510. Base plate; 511. Rectangular hole; 520. U-shaped plate; 521. Horizontal plate; 522. Vertical plate; 523. Bevel; 6. Front fork; 7. Rear axle seat; 8. Bottom axle seat. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Example 1 A typical embodiment of the present invention, such as Figure 1 As shown, a frame-type box-type boom includes an upper cover plate 1, a lower cover plate 2, a left side plate 3, and a right side plate 4. The upper cover plate 1, lower cover plate 2, left side plate 3, and right side plate 4 are welded and fixed together to form a box structure. A support frame 5 is provided inside the box structure. The bottom of the support frame 5 is welded and fixed to the lower cover plate 2, and the two sides of the support frame 5 are welded and fixed to the left side plate 3 and the right side plate 4, respectively. By welding and fixing the support frame 5 inside the box structure, the strength of the boom can be improved, the risk of boom cracking can be reduced, and the stability of the excavator during operation can be guaranteed.

[0020] The front end of the box structure is equipped with a front fork 6 for hinged connection with the excavator's boom. The tail end of the front fork 6 is welded and fixed to the upper cover plate 1, lower cover plate 2, left side plate 3, and right side plate 4 respectively to ensure the stability of the connection between the front fork 6 and the box structure. The rear end of the box structure is equipped with a rear axle seat 7 for hinged connection with the excavator's swing platform. The tail end of the rear axle seat 7 is welded and fixed to the upper cover plate 1, lower cover plate 2, left side plate 3, and right side plate 4 respectively to ensure the stability of the connection between the rear axle seat 7 and the box structure. The middle part of the box structure is equipped with a center axle seat 8 for connection with the boom cylinder. The center axle seat 8 is located between the left side plate 3 and the right side plate 4. The left side plate 3 and the right side plate 4 have symmetrical mounting holes 401. The two ends of the center axle seat 8 pass through the mounting holes 401 on the left side plate 3 and the right side plate 4 respectively and are welded and fixed to the left side plate 3 and the right side plate 4 to effectively ensure the stability of the center axle seat 8 and the box structure. The upper surface of the upper cover plate 1 is welded and fixed with an ear plate 101 for connection with the boom cylinder.

[0021] The upper cover plate 1, lower cover plate 2, left side plate 3, and right side plate 4 are all made of a single piece of plate, without the need to be welded together from multiple plates of different thicknesses. This effectively avoids the risk of cracking in the weld caused by welding and improves the strength and stability of the excavator boom.

[0022] like Figure 2 As shown, the support frame 5 includes a base plate 510 and a U-shaped plate 520. Multiple U-shaped plates 520 are provided, and the multiple U-shaped plates 520 are arranged side by side along the length direction of the base plate 510. The bottom end of the U-shaped plate 520 is welded to the upper surface of the base plate 510. The longitudinal section of the base plate 510 is arc-shaped and adapted to the lower cover plate 2. The lower surface of the base plate 510 can fit against the upper surface of the lower cover plate 2, so that the base plate 510 can be welded and fixed to the lower cover plate 2.

[0023] The width of the base plate 510 is equal to the width between the inner walls of the left side plate 3 and the right side plate 4, and the length of the base plate 510 is equal to the length between the tail end of the front fork 6 and the tail end of the rear axle seat 7, so that the base plate 510 does not interfere with the fixed connection between the lower cover plate 2 and the left side plate 3, the right side plate 4, the front fork 6 and the rear axle seat 7.

[0024] U-shaped plate 520 is made by bending steel plate, such as Figure 3 As shown, it includes a horizontal plate 521 and two vertical plates 522. The two vertical plates 522 are located at both ends of the horizontal plate 521 and are set perpendicular to the horizontal plate 521. The top of the vertical plate 522 is connected to the horizontal plate 521, and the bottom of the vertical plate 522 is welded and fixed to the base plate 510. The bottom of the vertical plate 522 is provided with a bevel 523 to enhance the welding strength between the vertical plate 522 and the base plate 510. The two vertical plates 522 are the same height and are both less than the height of the left plate 3 and the right plate 4 to avoid the horizontal plate 521 interfering with the installation of the upper cover plate 1.

[0025] The length of the horizontal plate 521 is equal to the length between the inner walls of the left plate 3 and the right plate 4, so that the outer walls of the two vertical plates 522 can be tightly attached to the inner walls of the left plate 3 and the right plate 4. The two vertical plates 522 are welded and fixed to the left plate 3 and the right plate 4 respectively. Stress is transferred by setting the U-shaped plate 520. The stress can be evenly distributed to the left and right side plates by using the U-shaped plate 520, so that the stress distribution is uniform.

[0026] like Figure 4 As shown, a plurality of rectangular holes 511 are provided on the upper surface of the base plate 510. The rectangular holes 511 are arranged side by side along the length of the base plate 510. The inner edge of the rectangular holes 511 is welded and fixed to the circumference of the base plate 510. By providing rectangular holes 511 on the base plate 510, the weight of the base plate 510 can be effectively reduced.

[0027] In this embodiment, there are 5 U-shaped plates 520 arranged side by side along the length of the base plate 510. There are 3 rectangular holes 511. The 5 U-shaped plates 520 are welded and fixed at both ends and the middle of the rectangular holes 511, so that the 5 U-shaped plates 520 are distributed as evenly as possible. The width and thickness of the U-shaped plates 520 can be adjusted according to the actual stress to achieve uniform overall stress.

[0028] By welding the support frame 5 inside the boom, stress transfer is facilitated, stress distribution is made more uniform, the boom load-bearing capacity is increased, the overall fatigue strength of the boom is improved, and the risk of boom cracking is effectively reduced.

[0029] Meanwhile, adding a support frame 5 inside the boom cavity can appropriately reduce the weight of the upper and lower cover plates and the left and right side plates, thereby reducing the overall weight and cost of the boom.

[0030] During boom assembly welding, on the boom assembly fixture, first place the cover plate 2, front fork 6 and rear axle seat 7, then place the support frame 5. The bottom plate 510 of the support frame 5 and the lower cover plate 2 are welded together. Then place the left side plate 3. Then flip the fixture. When the right side plate 4 is facing upward, the U-shaped plate 520 and the left side plate 3 are welded together. Place the center axle seat 8 and the right side plate 4. Flip the fixture. When the left side plate 3 is facing upward, the U-shaped plate 520 and the right side plate 4 are welded together. Flip the fixture. When the upper cover plate 1 is facing upward, place the upper cover plate 1 and ear plate 101. Finally, weld the outside of the box.

[0031] Adding a support frame 5 inside the boom cavity and welding it together as a whole can significantly reduce the overall stress of the boom, facilitate stress transmission, make the overall stress distribution uniform, and improve the overall fatigue strength of the boom.

[0032] Example 2 This embodiment provides an excavator, including a frame-type boom as described in Embodiment 1, wherein the front end of the frame-type boom is hinged to the excavator stick, and the rear end of the frame-type boom is hinged to the excavator slewing platform.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A frame-type box-type boom, characterized in that, It includes an upper cover plate, a lower cover plate, a left side plate, and a right side plate. The upper cover plate, lower cover plate, left side plate, and right side plate are welded and fixed together to form a box structure. The box structure is provided with a support frame. The bottom of the support frame is welded and fixed to the lower cover plate, and the two sides of the support frame are welded and fixed to the left side plate and the right side plate, respectively.

2. The frame-type box-type boom as described in claim 1, characterized in that, The front end of the box structure is provided with a front fork, and the tail end of the front fork is welded and fixed to the upper cover plate, lower cover plate, left side plate and right side plate respectively. The rear end of the box structure is provided with a rear axle seat, and the tail end of the rear axle seat is welded and fixed to the upper cover plate, lower cover plate, left side plate and right side plate respectively.

3. A frame-type box-type boom as described in claim 1, characterized in that, A central shaft seat is provided in the middle of the box structure. The central shaft seat is located between the left side plate and the right side plate. The left side plate and the right side plate are symmetrically provided with mounting holes. The two ends of the central shaft seat pass through the mounting holes on the left side plate and the right side plate respectively, and are welded and fixed to the left side plate and the right side plate.

4. A frame-type box-type boom as described in claim 1, characterized in that, An ear plate is welded and fixed to the middle of the upper surface of the cover plate.

5. A frame-type box-type boom as described in claim 1, characterized in that, The support frame includes a base plate and U-shaped plates. Multiple U-shaped plates are arranged side by side along the length of the base plate, and the bottom ends of the U-shaped plates are welded to the upper surface of the base plate.

6. A frame-type box-type boom as described in claim 5, characterized in that, The longitudinal section of the base plate is arc-shaped and fits the lower cover plate. The lower surface of the base plate can fit against the upper surface of the lower cover plate, and the base plate is welded and fixed to the lower cover plate.

7. A frame-type box-type boom as described in claim 6, characterized in that, The width of the base plate is equal to the width between the inner walls of the left and right sides of the base plate, and the length of the base plate is equal to the length between the tail end of the front fork and the tail end of the rear axle seat.

8. A frame-type box-type boom as described in claim 5, characterized in that, The U-shaped plate is made of steel plate and includes a horizontal plate and two vertical plates. The two vertical plates are located at both ends of the horizontal plate and are perpendicular to the horizontal plate. The top of the vertical plate is connected to the horizontal plate, and the bottom of the vertical plate is welded and fixed to the base plate. The bottom of the vertical plate is provided with a bevel.

9. A frame-type box-type boom as described in claim 8, characterized in that, The length of the horizontal plate is equal to the length between the inner walls of the left and right plates. The outer walls of the two vertical plates are tightly attached to the inner walls of the left and right plates, and the two vertical plates are welded and fixed to the left and right plates respectively.

10. An excavator, characterized in that, Includes the frame-type box boom as described in any one of claims 1-9, wherein the front end of the frame-type box boom is hinged to the excavator stick, and the rear end of the frame-type box boom is hinged to the upper body of the excavator.

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