A three-section boom for construction machinery and an assembly method thereof

Abstract

The present invention relates to the technical field of the boom of construction machinery, and specifically discloses a three-section boom of construction machinery and an assembly method. The three-section boom includes a first boom, a second boom, and a third boom. The first boom is swingably connected to the vehicle frame up and down. The second boom is swingably connected to the first boom up and down. The third boom is swingably connected to the second boom left and right. By adopting the present invention, the lateral swing of the boom can be realized, and it has the advantages of wide application working conditions and good use effects.

Description

Technical Field

[0001] The present invention relates to the technical field of the boom of construction machinery, and particularly relates to a three-section boom of construction machinery and an assembly method thereof. Background Art

[0002] An excavator, also known as an excavation machine or a power shovel, is used to excavate materials above or below the machine surface with a bucket. The traditional boom of an excavator generally adopts a two-section structure. However, with the increasingly complex current working conditions and more and more restricted working environments, in some excavation working environments restricted by obstacles and other reasons, the space available for the bucket operation is very limited. At the same time, since the direction between the boom of the excavator and above the turntable and the cab is fixed, therefore, when it is necessary to rotate the structure above the boom, it must rely on the rotation of the turntable and the cab. Limited by this structure, when the side is restricted in some operations (hindering the continuous rotation of the turntable), the situation where effective operation cannot be carried out will occur. Summary of the Invention

[0003] Aiming at the above deficiencies, the present invention provides a three-section boom of construction machinery and an assembly method thereof to meet the requirements of various types of working conditions.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A three-section boom of construction machinery includes a first boom section, a second boom section, and a third boom section. The first boom section is swingably connected to the vehicle frame up and down. The second boom section is swingably connected to the first boom section up and down. The third boom section is swingably connected to the second boom section left and right.

[0006] Optionally, the front end of the third boom section is swingably connected to the stick up and down.

[0007] Optionally, the first boom section is driven by a hydraulic cylinder through a V-shaped connecting rod.

[0008] Optionally, a hydraulic cylinder is arranged on the side wall of the second boom section to drive the third boom section to swing left and right. Optionally, the third boom section and the second boom section are connected through an anti-side pressure rotating shaft assembly; the anti-side pressure rotating shaft assembly includes an anti-side pressure shaft sleeve assembly, a rolling bearing, and a roller panel; the anti-side pressure shaft sleeve assembly includes a shaft sleeve body, and a support panel is arranged on the side wall of the shaft sleeve body, and the support panel is arranged radially; a shaft sleeve insertion hole and a roller panel fixing groove are arranged at the front end of the second boom section; the roller panel is arranged in the roller panel fixing groove; the rolling bearing is fixed in the shaft sleeve insertion hole; the shaft sleeve body is inserted into the shaft sleeve insertion hole and can be movably fixed, and the support panel can be movably arranged in the roller panel fixing groove; the third boom section is connected to the shaft sleeve body through bolts or pins; the roller panel is arranged on the upper side and / or the lower side of the support panel.

[0009] Optionally, the roller panel and the support panel are fan-shaped in top view.

[0010] Optionally, a number of steel ball roller tightening holes are provided on the roller panel; a number of steel ball rollers are fixed in the steel ball roller tightening holes.

[0011] A method for assembling a three-section boom of a construction machinery as described above includes the following steps:

[0012] (1) First, install two rolling bearings in the middle of the bushing socket hole, and then knock the two bushing bodies into the two rolling bearings from the upper side and the lower side respectively and clamp them in place;

[0013] (2) Install the two roller panels respectively and tighten them to the second boom through two horizontal bolts;

[0014] (3) Then insert the connecting end of the third boom into the upper and lower sides of the second boom correspondingly, and align the connecting hole of the third boom with the fixed socket hole of the bushing body;

[0015] (4) Use two pins or one pin to sequentially pass through the connecting hole, the fixed socket hole and the inner ring of the rolling bearing, and tighten them with interference fit.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By adopting the present invention, the lateral swing of the boom can be realized, the working conditions are wide, and the use effect is good.

[0018] 2. Between the third boom and the second boom of the present invention, a lateral pressure prevention rotating shaft assembly is adopted for connection, which can effectively prevent the phenomenon that the lateral joint is difficult to swing and the connection is loosened due to wear when the traditional simple hinge method is used for lateral swing during excavation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments.

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a cross-sectional view of the lateral pressure prevention rotating shaft assembly of the present invention;

[0022] Figure 3 is a cross-sectional view of the bushing body of the present invention;

[0023] Figure 4 is a bottom view of the roller panel and the support panel of the present invention. Detailed implementation manners

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0026] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] A three-section boom for construction machinery includes a first boom 11, a second boom 1, and a third boom 6. The first boom 11 is swingably connected to the vehicle frame 14 up and down. The second boom 1 is swingably connected to the first boom 11 up and down. The third boom 6 is swingably connected to the second boom 1 left and right. Some embodiments may adopt the following solutions during specific implementation:

[0028] 1. The first boom 11 is hinged to the vehicle frame 14, the second boom 1 is hinged to the first boom 11, and the third boom 6 is hinged to the second boom 1. Then the front end of the third boom 6 is swingably connected to the bucket rod 19 in a hinged manner. The front end of the bucket rod 19 is connected to the bucket 21 through a connecting rod; the first boom 11 is driven by a hydraulic cylinder 15 through a V-shaped connecting rod. In this embodiment, the lower end of the hydraulic cylinder 15 is movably connected to the vehicle frame 14. The upper connecting rod 12 of the V-shaped connecting rod is movably connected to the first boom 11, and its lower connecting rod 13 is movably connected to the vehicle frame 14. When in use, with the above structure, the hydraulic cylinder 15 can effectively improve the driving performance of the three-section boom, ensure sufficient torque during the operation of the excavator, and improve the operation effect. The second boom 1 obtains power from the first boom 11 through a second hydraulic cylinder 16, and the third boom 6 and the bucket rod 19 obtain driving force through a third hydraulic cylinder 18; between the third boom 6 and the second boom 1, a hydraulic cylinder 17 is provided on the side wall of the second boom 1 to drive the left and right swing of the third boom 6.

[0029] 2. In actual operation, compared with traditional excavators, a third boom 6 is added to meet the operating function of the lateral swing of the third boom 6. However, in order to improve the smoothness and reliability of the lateral movement of the third boom 6 and the second boom 1 during the excavation operation, prevent wear at their connection during long-term use, reduce the squeezing force in the front-rear direction of the intermediate rotating shaft rod, and improve the smoothness of the lateral swing during the excavation operation, the following solutions can also be used in some embodiments:

[0030] The third boom 6 and the second boom 1 are connected through an anti-side pressure rotating shaft assembly; the anti-side pressure rotating shaft assembly includes an anti-side pressure shaft sleeve assembly, a rolling bearing 7, and a roller panel; the anti-side pressure shaft sleeve assembly includes a shaft sleeve body 4, and a support panel 10 is provided on the side wall of the shaft sleeve body 4. The support panel 10 is combined with the side wall of the shaft sleeve body 4 through a support arm 10-1. During specific preparation, it can be an integrally formed workpiece or can be welded through a welding surface. The support panel 10 is arranged radially; a shaft sleeve socket 5-1 and a roller panel fixing groove 1-1 are provided at the front end of the second boom 1; the roller panel 8 has a stepped lateral cross-section and is fastened to the roller panel fixing groove 1-1 through two horizontal bolts 9; the rolling bearing 7 is fixed in the shaft sleeve socket 5-1. In this embodiment, two rolling bearings 7 can be provided, that is, Figure 2As shown, it can be set up with two sets of connecting mechanisms up and down, including a rolling bearing 7 placed in the middle and a sleeve body 4. A fixed jack 4-1 is provided in the middle of the sleeve body 4, and a rolling bearing clamping platform 4-2 is provided at its lower part. During assembly, the rolling bearing clamping platform 4-2 is tightened onto the rolling bearing 7, and then the sleeve body 4 can be inserted into the sleeve jack and fixed movably, and the support panel 10 can be movably arranged in the roller panel fixing groove 1-1. After assembly, a swinging cavity 10-2 is reserved; the third arm 6 is fixedly connected to the fixed jack 4-1 by a bolt or a pin 5 passing through the connection hole 6-1 of the third arm 6. During assembly, interference fit or direct welding can be used for fastening; thus, the third arm 6 and the sleeve body 4 are connected into one body. When the third arm 6 rotates relative to the second arm 1, the support panel 10 moves relative to the roller panel 8 and realizes the support in the up and down directions, preventing the third arm 6 from deviating front and back along the axis of the pin 5 due to the force during the excavation process, and not affecting the swinging of the third arm 6 in the left and right directions due to the front and back deviation. In actual operation, the swinging of the third arm 6 in the left and right directions generally only requires a very small amplitude of swinging, such as swinging 3 to 5 degrees left and right. Therefore, using this device can already meet the general operation requirements; the roller panel is arranged on the upper side and / or the lower side of the support panel 10.

[0031] Optionally, the roller panel 8 and the support panel 10 are fan-shaped when viewed from above.

[0032] Optionally, a number of steel ball roller tightening holes 2 are provided on the roller panel 8; a number of steel ball rollers 3 are fixed in the steel ball roller tightening holes 2. The steel ball rollers 3 used can be of thread type or pin style, preferably made of stainless steel material, such as nut-fixed steel ball rollers, brand QX, and the specifications can be selected from the BCHM series, and different sizes are selected according to the size of the arm.

[0033] During assembly:

[0034] (1) First, install two rolling bearings 7 (standard parts) in the middle of the sleeve jack 5-1, and then knock the two sleeve bodies 4 (standard parts) into the two rolling bearings 7 from the upper side and the lower side respectively and clamp them in place; that is, the outer ring of the rolling bearing 7 is in interference fit with the sleeve jack 5-1, and the rolling bearing clamping platform 4-2 of the sleeve body 4 is in interference fit with the inner ring of the rolling bearing 7;

[0035] (2) Install the two roller panels 8 respectively and tighten them to the second boom 1 through two horizontal bolts 9. The advantage of using two horizontal bolts 9 is that it can improve the support strength. The roller panel 8 is a standard part during preparation, and after assembly, it can make the support panel 10 just abut (extrude) the surface of the roller panel 8. Therefore, during assembly, it is also required that the bushing body 4 (standard part) in step (1) be tightly clamped in place during installation.

[0036] (3) Then insert the connection end of the third boom 6 into the upper and lower sides of the second boom 1 correspondingly, and align the connection hole of the third boom with the fixed jack of the bushing body.

[0037] (4) Use two pins or one pin 5 to sequentially pass through the connection hole 6-1, the fixed jack 4-1 and the inner ring of the rolling bearing 7, and tighten them with interference fit. When using two pins, the two pins are respectively pressed against the end of one of the rolling bearings 7. If one pin 5 is used, it directly penetrates and presses. The advantage of using one pin is that when disassembling and replacing parts, the pin 5 can be directly knocked out with a ejector rod, which is convenient for operation. After assembly, ensure that the third boom 6 can rotate freely and smoothly in a small range left and right relative to the second boom 1. At this time, when the third boom 6 rotates relative to the second boom 1, the support panel 10 also swings left and right under the extrusion of the surface of the roller panel 8. The advantage of adopting this configuration is that compared with only relying on the rolling bearing for the rotational connection between the third boom 6 and the second boom 1, the single rolling bearing connection method (when swinging left and right, its rotation axis is vertically distributed instead of the traditional horizontal rotation axis), under the reaction force of the dipper stick 19 during excavation operations, the vertical rotation axis is prone to tilting at both the upper and lower ends, and then the acting force will be concentrated on a single ball on the front and back sides of the rolling axis, resulting in the ball being easily crushed. Without using a rolling bearing, the connection hole is easily worn and enlarged, resulting in looseness. In this design scheme, by setting the support panel 10 and the third boom 6 to rotate synchronously, and using the rolling surface of the roller panel 8 to decompose the above-mentioned acting force, it not only improves the smoothness of the synchronous left and right swing during normal excavation operations, but also improves the service life and has good reliability.

Claims

1. A three - section boom for construction machinery, characterized in that: It includes a first boom, a second boom and a third boom. The first boom is swingably connected to the vehicle frame up and down. The second boom is swingably connected to the first boom up and down. The third boom is swingably connected to the second boom left and right. The third boom and the second boom are connected through an anti-side pressure rotating shaft assembly. The anti-side pressure rotating shaft assembly includes an anti-side pressure shaft sleeve assembly, a rolling bearing and a roller panel. The anti-side pressure shaft sleeve assembly includes a shaft sleeve body. A support panel is provided on the side wall of the shaft sleeve body and is arranged radially. A shaft sleeve insertion hole and a roller panel fixing groove are provided at the front end of the second boom. The roller panel is arranged in the roller panel fixing groove. The rolling bearing is fixed in the shaft sleeve insertion hole. The shaft sleeve body is inserted into the shaft sleeve insertion hole and can be movably fixed, and the support panel can be movably arranged in the roller panel fixing groove. The third boom is connected to the shaft sleeve body by bolts or pins. The roller panel is arranged on the upper side and / or the lower side of the support panel. The roller panel and the support panel are fan-shaped when viewed from above. A number of steel ball roller tightening holes are provided on the roller panel. A number of steel ball rollers are fixed in the steel ball roller tightening holes.

2. The three - section boom of a construction machinery according to claim 1, characterized in that: The front end of the third boom is swingably connected to the dipper stick up and down.

3. The three-section boom of a construction machinery according to claim 1, characterized in that: The first boom is driven by a hydraulic cylinder through a V-shaped connecting rod.

4. A three-section boom for construction machinery according to claim 1, characterized in that: A hydraulic cylinder is provided on the side wall of the second boom to drive the third boom to swing left and right.

5. An assembly method for a three-section boom of a construction machinery as described in any one of claims 1 to 4, characterized in that, It includes the following steps: (1) First, install two rolling bearings in the middle of the shaft sleeve insertion hole, and then knock the two shaft sleeve bodies into the two rolling bearings from the upper side and the lower side respectively and clamp them in place. (2) Install the two roller panels respectively and tighten them to the second boom through two horizontal bolts. (3) Then insert the connection end of the third boom into the upper and lower sides of the second boom respectively, and align the connection hole of the third boom with the fixed insertion hole of the shaft sleeve body. (4) Use two pins or one pin to sequentially pass through the connection hole, the fixed insertion hole and the inner ring of the rolling bearing, and tighten them with interference.

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