Swing cylinder for excavator attachment

Abstract

The utility model discloses a kind of swing oil cylinders for excavator accessory, comprising: cylinder barrel, output screw rod and driving mechanism;The inner wall of both ends of the cylinder barrel is formed with first boss;One end of the output screw rod is fixed with first end cover, the other end of the output screw rod is sleeved with second end cover, the end of the output screw rod away from the first end cover is also connected with locking assembly, the locking assembly is used to prevent second end cover and output screw rod from separating;The driving mechanism is located inside cylinder barrel, the driving mechanism is sleeved on output screw rod, to drive output screw rod rotate around circumferential direction, the utility model has the advantages of reducing vulnerable parts, simplifying assembly steps.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic cylinder technology, specifically relating to swing cylinders, and more particularly to a swing cylinder for excavator attachments. Background Technology

[0002] Construction machinery attachments are diverse and can be broadly categorized into three types: basic attachments, specialized attachments, and comprehensive solution attachments. Specifically, they mainly include hydraulic breakers, quick connectors, clamps, vibratory rammers, hydraulic shears, rippers, etc. Among these, excavators are the primary main application machines for attachments.

[0003] In existing swing cylinder structures for attachments, the main components include an output screw, a hollow screw, an end cover, and a cylinder barrel. Upper and lower limit rings are installed inside the cylinder barrel, with their opposite sides contacting the output screw and end cover, respectively. Bearings are clamped between the upper limit ring and the output screw, and between the lower limit ring and the end cover, to allow rotation of the output screw and end cover. However, in harsh working environments, such as when excavators operate in severe conditions, frequent vibrations and impacts can easily damage the bearings, causing the swing cylinder to malfunction. To address this problem, a new swing cylinder for excavator attachments is proposed. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0005] Therefore, this utility model proposes a swing cylinder for excavator attachments, which has the advantages of reducing vulnerable parts and simplifying assembly steps.

[0006] A swing cylinder for excavator attachments according to an embodiment of the present invention includes: a cylinder barrel, an output screw, and a drive mechanism; a first boss is formed on the inner wall of both ends of the cylinder barrel; a first end cap is fixed to one end of the output screw, and a second end cap is sleeved on the other end of the output screw; a locking assembly is also connected to the end of the output screw away from the first end cap, the locking assembly being used to prevent the second end cap from disengaging from the output screw; the drive mechanism is disposed inside the cylinder barrel and sleeved on the output screw to drive the output screw to rotate around a circumference.

[0007] According to one embodiment of the present invention, a wear-resistant layer is formed on the contact surfaces of the cylinder, the first end cover, and the second end cover.

[0008] According to one embodiment of the present invention, the output screw is splinedly connected to the second end cap.

[0009] According to one embodiment of the present invention, a second boss is formed on the circumferential surface of the output screw away from the first end cover, and the second boss abuts against the locking assembly.

[0010] According to one embodiment of the present invention, the locking assembly and the output screw are connected by a set screw, and an adjusting shim is provided between the second boss and the locking assembly.

[0011] According to one embodiment of the present invention, a groove is formed on the side of the second end cap facing the locking component, and one end of the locking component is embedded in the groove.

[0012] According to one embodiment of the present invention, a first sealing ring is provided on the circumferential surface of both the first end cap and the second end cap.

[0013] According to one embodiment of the present invention, an annular groove is formed on the circumferential surface of both the first end cap and the second end cap, and the first sealing ring is installed in the annular groove.

[0014] According to one embodiment of the present invention, the middle area of ​​the second end cap is splinedly connected to the output screw, the end of the second end cap away from the locking assembly is in contact with the output screw, and a second sealing ring is provided on the inner surface of the end of the second end cap away from the locking assembly.

[0015] According to one embodiment of the present invention, the wear-resistant layer is a nitrided layer.

[0016] The beneficial effects of this utility model are that it uses a locking component to limit the second end cover, so that the first end cover and the second end cover are not locked to the first boss, and the two first bosses limit the first end cover and the second end cover, so that the first end cover and the second end cover can only move axially within a small range. Therefore, it avoids the first end cover and the second end cover from getting stuck when the output screw rotates, thus ensuring the smoothness of rotation. In addition, this design avoids the use of bearings and other components, simplifies the assembly steps, and reduces vulnerable parts.

[0017] Wear-resistant layers are formed on the contact surfaces of the cylinder barrel, the first end cover, and the second end cover, which enhances wear resistance and improves service life.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments with accompanying drawings, in which:

[0021] Figure 1 This is a schematic diagram showing the overall structure of this utility model disassembled;

[0022] Figure 2 This is a front view schematic diagram of the overall structure of this utility model;

[0023] Figure 3 This is a three-dimensional cross-sectional view of the overall structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure label:

[0026] 1. Cylinder barrel; 11. First boss; 12. Fixing nut; 13. Hollow screw; 2. Output screw; 21. First end cover; 22. Second end cover; 23. Locking assembly; 3. Adjusting shim; 4. First sealing ring; 5. Second sealing ring. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The swing cylinder for excavator attachments according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0031] like Figures 1-4 As shown, the swing cylinder for excavator attachments according to an embodiment of the present invention includes: a cylinder barrel 1, an output screw 2, and a drive mechanism; a first boss 11 is formed on the inner wall of both ends of the cylinder barrel 1; a first end cap 21 is fixed to one end of the output screw 2, and a second end cap 22 is sleeved on the other end of the output screw 2; a locking assembly 23 is also connected to the end of the output screw 2 away from the first end cap 21, and the locking assembly 23 is used to prevent the second end cap 22 from disengaging from the output screw 2; the drive mechanism is located inside the cylinder barrel 1 and is sleeved on the output screw 2 to drive the output screw 2 to rotate around the circumference; the two first bosses 11 are respectively used to limit the first end cap 21 and the second end cap 22.

[0032] In this embodiment, the drive mechanism includes a fixed nut 12 and a hollow screw 13. The fixed nut 12 is sleeved on the hollow screw 13 and engages with the outer surface of the hollow screw 13 for transmission. The fixed nut 12 is fixed to the inner wall of the cylinder 1. The hollow screw 13 is sleeved on the output screw 2, and the output screw 2 has a thread that engages with the hollow screw 13. The threads engaging with each other on the fixed nut 12, the hollow screw 13, and the output screw 2 are all helical threads. By injecting oil into the cylinder 1, the oil pushes the hollow screw 13 along the central axis of the cylinder 1. Under the guidance of the fixed nut 12, the hollow screw 13 rotates around its circumference, and during the rotation, it drives the output screw 2 to rotate, thus completing the rotation action. The first end cap 21 is welded to the output screw 2. The position of the second end cap 22 is limited by the locking assembly 23, ensuring that the distance between the first end cap 21 and the second end cap 22 is greater than the distance between the two first bosses 11. This prevents the first end cap 21 and the second end cap 22 from being locked to the first bosses 11. Furthermore, the two first bosses 11 limit the movement of the first end cap 21 and the second end cap 22, allowing only a small range of axial movement. This prevents the first end cap 21 and the second end cap 22 from jamming when the output screw 2 rotates, ensuring smooth rotation. This design also avoids the use of bearings and other components, simplifying the assembly process and reducing vulnerable parts. Additionally, the gap between the first end cap 21 and the second end cap 22 and the first bosses 11 prevents constant contact and friction, reducing friction frequency and wear. The oil in the gap also provides lubrication, further reducing friction loss.

[0033] Furthermore, the connection method between the first end cap 21 and the output screw 2 includes, but is not limited to, any one or more combinations of key / pin connection, threaded connection, screw connection, welding, etc.

[0034] A wear-resistant layer is formed on the contact surfaces of cylinder 1, first end cover 21, and second end cover 22; the wear-resistant layer is a nitrided layer. A nitrided layer with high hardness is formed on the metal surfaces of cylinder 1 in contact with first end cover 21 and cylinder 1 in contact with second end cover 22 through a nitriding process, which significantly improves the wear resistance and scratch resistance of the components.

[0035] In this embodiment, during the rotation of the first end cover 21 and the second end cover 22, the first end cover 21 and the second end cover 22 directly contact and rub against the first boss 11. By forming a wear-resistant layer on the contact surface of the cylinder 1, the first end cover 21 and the second end cover 22, the wear resistance is enhanced. Therefore, the use of bushings, bearings and other components is avoided, and vulnerable parts are reduced.

[0036] Furthermore, the cylinder barrel 1, output screw 2, fixing nut 12, hollow screw 13, first end cap 21, second end cap 22, and locking assembly 23 can all be nitrided as a whole as required. For example, if wear resistance is required for one or more of the cylinder barrel 1, output screw 2, fixing nut 12, hollow screw 13, first end cap 21, second end cap 22, and locking assembly 23, or if corrosion resistance is required for one or more of the cylinder barrel 1, output screw 2, fixing nut 12, hollow screw 13, first end cap 21, second end cap 22, and locking assembly 23, then they can be nitrided as a whole.

[0037] Both the first end cap 21 and the second end cap 22 are provided with a first sealing ring 4 on their circumferential surfaces to seal the cylinder 1. Both the first end cap 21 and the second end cap 22 have annular grooves formed on their circumferential surfaces, and the first sealing ring 4 is installed in the annular grooves.

[0038] Specifically, the output screw 2 has a first stage, a second stage, a third stage, a fourth stage, a fifth stage, and a sixth stage in sequence from one end to the other; the diameters of the second stage, the third stage, the fourth stage, the fifth stage, and the sixth stage decrease in sequence.

[0039] The first stage is fixedly connected to the first end cap 21.

[0040] The second stage has a herringbone thread formed on the circumferential surface for engagement with the hollow screw 13.

[0041] The inner circumferential surface of the end of the second end cap 22 away from the locking assembly 23 is in contact with the output screw 2, and a second sealing ring 5 is provided on the circumferential surface of the end of the second end cap 22 away from the locking assembly 23. The third stage is a plane, and the third stage is in contact with the inner surface of the end of the second end cap 22 away from the locking assembly 23, and the second sealing ring 5 is also located in the area of ​​the third stage.

[0042] The fourth stage has a spline groove formed on its circumferential surface that is aligned with the central axis of the output screw 2, so as to engage with the middle area of ​​the second end cover 22, so that the second end cover 22 rotates synchronously with the output screw 2, and the second end cover 22 can slide along the axial direction of the output screw 2.

[0043] The second end cap 22 has a groove on the side facing the locking assembly 23, and one end of the locking assembly 23 is embedded in the groove. The fifth stage is located in the area corresponding to the groove of the second end cap 22 and is threadedly connected to the inner surface of the locking assembly 23. A second boss is formed on the circumferential surface of the output screw 2 away from the first end cap 21. The connection surface between the sixth stage and the fifth stage is the second boss, which abuts against the locking assembly 23. The locking assembly 23 and the output screw 2 are also connected by a set screw. An adjusting shim 3 is provided between the second boss and the locking assembly 23. The position of the locking assembly 23 against the second end cap 22 is adjusted by adjusting the shim 3 to adjust the axial movement space of the second end cap 22 to avoid the first end cap 21 and the second end cap 22 clamping the first boss 11 too tightly, which would prevent rotation. After the locking assembly 23 is installed, holes are drilled in the sixth stage of the output screw 2 and the locking assembly 23 to install set screws for further fixing the output screw 2 and the locking assembly 23.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A swing cylinder for excavator attachments, characterized in that, include: Cylinder (1), with first bosses (11) formed on the inner walls at both ends of the cylinder (1). An output screw (2) is provided with a first end cap (21) fixed at one end and a second end cap (22) sleeved at the other end. A locking assembly (23) is also connected to the end of the output screw (2) away from the first end cap (21). The locking assembly (23) is used to prevent the second end cap (22) from detaching from the output screw (2). The driving mechanism is located inside the cylinder (1) and is sleeved on the output screw (2) to drive the output screw (2) to rotate around the circumference. The two first protrusions (11) are used to limit the first end cap (21) and the second end cap (22), respectively.

2. The swing cylinder for excavator attachments according to claim 1, characterized in that, Wear-resistant layers are formed on the contact surfaces of the cylinder (1), the first end cap (21), and the second end cap (22).

3. The swing cylinder for excavator attachments according to claim 2, characterized in that, The output screw (2) is splinedly connected to the second end cap (22).

4. The swing cylinder for excavator attachments according to claim 1, characterized in that, The output screw (2) has a second protrusion formed on the circumferential surface away from the first end cover (21), and the second protrusion abuts against the locking assembly (23).

5. The swing cylinder for excavator attachments according to claim 4, characterized in that, The locking assembly (23) and the output screw (2) are connected by a set screw, and an adjusting shim (3) is provided between the second boss and the locking assembly (23).

6. The swing cylinder for excavator attachments according to claim 5, characterized in that, The second end cap (22) has a groove on the side facing the locking assembly (23), and one end of the locking assembly (23) is embedded in the groove.

7. The swing cylinder for excavator attachments according to claim 6, characterized in that, The first end cap (21) and the second end cap (22) are both provided with a first sealing ring (4) on their circumferential surfaces.

8. The swing cylinder for excavator attachments according to claim 7, characterized in that, Both the first end cap (21) and the second end cap (22) have annular grooves formed on their circumferential surfaces, and the first sealing ring (4) is installed in the annular groove.

9. The swing cylinder for excavator attachments according to claim 8, characterized in that, The middle area of ​​the second end cap (22) is splinedly connected to the output screw (2). The end of the second end cap (22) away from the locking assembly (23) is in contact with the output screw (2). The inner surface of the end of the second end cap (22) away from the locking assembly (23) is provided with a second sealing ring (5).

10. The swing cylinder for excavator attachments according to claim 2, characterized in that, The wear-resistant layer is a nitrided layer.

Images