Hydraulic rotary devices for operating machinery and operating machinery

Abstract

This utility model relates to a hydraulic rotary device for operating machinery and the operating machinery itself. The hydraulic rotary device includes a rotary base, a rotary head mounted on the outside of the rotary base and rotatable relative to the rotary base, and a shift fork disposed on the rotary head and connected to the boom to allow the rotary head to rotate with the boom. The rotary base has at least one base flow channel with a connecting port on the peripheral wall of the rotary base. The rotary head has at least one oil flow channel with a connecting slot on the inner wall surface of the rotary head that engages with the rotary base. The connecting slot and the connecting port of the base flow channel are positioned corresponding to each other and configured to at least partially overlap and thus communicate with each other on the engagement surface of the rotary head and the rotary base within the range of motion of the boom. This utility model's hydraulic rotary device can meet the dynamic rotation requirements of the boom in confined spaces and effectively protects the pipeline.

Description

Technical Field

[0001] This utility model relates to the technical field of components for operating machinery, and in particular to a hydraulic rotary device for operating machinery, and operating machinery including the hydraulic rotary device. Background Technology

[0002] The working implements located at the front or rear of a work machine typically require hydraulic oil for operation. Taking a bulldozer as an example, the front blade (shovel) is connected to the main frame or undercarriage via a boom, and the boom cylinder provides the driving force for the boom's swinging and raising / lowering. The boom cylinder is located between the boom and the blade and is connected to the hydraulic system on the main frame of the work machine via pipelines. Hydraulic oil, under the power of the hydraulic system, enters or exits the boom cylinder along the pipelines, thereby driving the boom to swing or raise / lower.

[0003] In existing technology, the pusher cylinder on the pusher arm is typically connected to the hydraulic system via a hose extending from the rear of the pusher arm into the main frame. This exposes the entire hose to the outer surface of the work machine, and at least partly to the moving area of ​​the pusher arm. Bulldozers typically operate in harsh environments, and the pusher arm can spill substances such as mud and sand that can easily scratch the hose. Furthermore, when traversing uneven road surfaces, bumps can easily rub against the hose, causing it to rupture and preventing proper oil supply. Utility Model Content

[0004] The purpose of this utility model is to solve at least one of the above-mentioned problems and / or other problems existing in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a hydraulic rotary device for working machinery is provided. The hydraulic rotary device includes a spindle-shaped rotary base, a rotary head fitted outside the rotary base and rotatable relative to the rotary base, and a fork disposed on the rotary head and connected to the boom of the working machinery to rotate the rotary head with the boom. The rotary base has at least one base flow channel inside it, the base flow channel having a communication port formed on the peripheral wall of the rotary base. The rotary head has at least one oil flow channel, the oil flow channel having a communication slot formed on the inner wall surface of the rotary head that engages with the rotary base. The communication slot and the communication port of the base flow channel are positioned corresponding to each other and configured to maintain at least partial overlap on the engagement surface of the rotary head and the rotary base within the range of motion of the boom and thus communicate with each other.

[0006] According to one embodiment of the present invention, the connecting slot is an annular slot.

[0007] According to one embodiment of the present invention, the rotary base is provided with a first base flow channel and a second base flow channel that are isolated from each other inside. The rotary head is provided with a first oil flow channel and a second oil flow channel that are isolated from each other. The connecting port of the first base flow channel is connected to the connecting slot of the first oil flow channel, so that the first base flow channel and the first oil flow channel constitute a transfer section for the oil inlet flow path. The connecting port of the second base flow channel is connected to the connecting slot of the second oil flow channel, so that the second base flow channel and the second oil flow channel constitute a transfer section for the oil return flow path.

[0008] According to one embodiment of the present invention, the first base flow channel and the second base flow channel each include an axial flow channel and a radial flow channel that communicate with each other. The axial flow channel extends to a predetermined axial end wall of the rotating base, and the radial flow channel terminates at the communication port of the corresponding base flow channel.

[0009] According to one embodiment of the present invention, the connecting ports of the first base flow channel and the second base flow channel are arranged at intervals along the axial direction of the rotary base, and an annular sealing groove for receiving the sealing ring is provided near the connecting slot of each oil flow channel on the mating surface where the rotary head and the rotary base engage.

[0010] According to one embodiment of the present invention, the rotary head has a support groove for receiving the support ring on its mating surface where it engages with the rotary base.

[0011] According to one embodiment of the present invention, the first axial end of the rotary head abuts against a shoulder formed on the rotary base, and the second axial end of the rotary head abuts against an end cap mounted on the end of the rotary base, thereby causing the rotary head to be axially limited relative to the rotary base.

[0012] According to another aspect of the present invention, a working machine is provided, which includes a hydraulic rotary device according to the above description.

[0013] According to one embodiment of the present invention, the operating machinery includes a bulldozer.

[0014] According to one embodiment of the present invention, the working machine further includes a main frame, a traveling frame connected to the main frame via a pivot, and a push arm connected to the traveling frame via a slewing ball seat. The pivot is provided with a pivot hole, the slewing ball seat is provided with a seat hole, and a slewing base extends through the seat hole. The first axial end of the slewing base is connected to the traveling frame, and the second axial end of the slewing base extends into the push arm. A rigid oil pipe provided in the pivot hole communicates with a base flow channel provided on the slewing base. The oil flow channel of the slewing head communicates with a hose connected to the push arm cylinder. The shift fork is fixedly connected to the push arm.

[0015] The oil circuit rotary device of this utility model has at least one base flow channel formed inside the rotary base and at least one oil flow channel inside the rotary head. The base flow channel and the oil flow channel can maintain fluid communication within the rotation range of the push arm through the overlap between the connecting port and the connecting slot. Thus, under the constraint of a small space, it can meet the dynamic rotation requirements of the push arm, while also meeting the requirements for the transmission of pressure oil from the working valve to the cylinder and the return of pressure oil from the cylinder to the hydraulic system, and more effectively protect the pipeline. Attached Figure Description

[0016] The features and advantages of this utility model will become clear from the following detailed description provided with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and therefore should not be considered as limitations on this utility model, wherein:

[0017] Figure 1 A schematic diagram of an oil-lined rotary device according to an embodiment of the present invention is shown for use in working machinery.

[0018] Figure 2 Show Figure 1 The diagram shows a cross-sectional view of the oil circuit rotary device.

[0019] Explanation of reference numerals in the attached figures:

[0020] 100. Oil circuit rotary device; 200. Main frame; 300. Pivot; 301. Pivot hole; 400. Running frame; 500. Rotary ball seat; 501. Seat hole; 600. Push arm; 700. Rigid oil pipe; 800. Hose; 1. Rotary base; 11. First base flow channel; 111. First connecting port; 112. First axial port; 12. Second base flow channel; 121. Second connecting port; 122. Second axial port; 2. Rotary head; 21. First oil flow channel; 212. First connecting slot; 211. First end port; 22. Second oil flow channel; 222. Second connecting slot; 221. Second end port; 23. Annular sealing groove; 24. Support groove; 3. Shift fork; 6. End cover. Detailed Implementation

[0021] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to enable those skilled in the art to more fully understand and implement the present invention. However, it will be apparent to those skilled in the art that implementations of the present invention may not include some of these specific details. Furthermore, it should be understood that the present invention is not limited to the specific embodiments described. Rather, the present invention can be conceived to be implemented with any combination of the features and elements described below, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are for illustrative purposes only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims.

[0022] The terms "first" and "second" are used below to describe the elements of this application. These terms are used only to distinguish the individual elements and not to limit the nature, order, or number of these elements. The terms "comprising" and "having" are used to indicate an open-ended inclusion and mean that there may be additional elements / components besides those listed.

[0023] Figure 1 A schematic diagram of a hydraulic rotary device 100 according to an embodiment of the present invention is shown for use in working machinery. For example... Figure 1 As shown, the working machine can be a bulldozer. The working machine may include a main frame 200, a pivot 300, a running frame 400, a slewing ball joint 500, and a pusher arm 600. The main frame 200 is the core load-bearing structure of the bulldozer, on which components such as the engine, gearbox, and hydraulic pump can be mounted, bearing the weight and working load of all their parts, and connecting its upper structure (such as the cab and power system) to its lower structure (running frame 400). The main frame 200 also bears the enormous reaction forces from the pusher arm and blade during bulldozing.

[0024] Pivots 300 are respectively provided on both sides of the main frame 200. The traveling frames 400 can be respectively arranged on the left and right sides of the main frame 200 and fitted onto the pivots 300, thus connecting to the main frame 200 via the pivots 300. This allows the traveling frames 400 to float up and down to a certain extent on the left and right sides of the main frame 200, adapting to terrain and improving overall stability and traction. The push arm is connected to the traveling frame via a slewing device. A slewing ball seat 500 is located on the outer side of the traveling frame 400 opposite to the main frame and includes a sleeve-shaped body. A ball head with an approximately spherical outer contour is provided at the first end of the body, and the ball head is embedded in a spherical groove formed on the push arm, forming a movable connection structure. The second end of the slewing ball seat body, opposite to the first end, extends into a cylindrical groove provided on the side wall of the traveling frame 400, sealing them together. This allows the push arm 600 to swing relative to the traveling frame 400 within a certain angle range. The push arm 600 may have a through hole extending along its own length, thereby facilitating the connection of a hose through the through hole of the push arm 600 to the push arm cylinder.

[0025] A pivot hole 301 is provided on the pivot, and a seat hole 501 extending through the rotary ball seat is provided on the rotary ball seat. The oil circuit rotary device 100 is disposed in the seat hole 501 of the rotary ball seat 500, and its first axial end is fixed to the traveling frame 400, while its second axial end, opposite to the first axial end, extends into the push arm 600. In this way, a rigid oil pipe 700 disposed in the main frame 200 can pass through the pivot hole 301 and be connected to the first axial end of the oil circuit rotary device 100 fixed to the traveling frame 400. The second axial end of the oil circuit rotary device is connected to a flexible hose 800 disposed in the push arm 600 and connected to the push arm cylinder.

[0026] Figure 2 A rotary hydraulic device 100 according to one embodiment of the present invention is shown. For example... Figure 1 and Figure 2As shown, the oil circuit rotary device 100 according to this embodiment may include a rotary base 1, a rotary head 2, and a shift fork 3. The rotary base 1 is generally cylindrical and includes a first section and a second section along the axial direction. The outer diameter of the first section is larger than the outer diameter of the second section, thereby forming a transition surface (i.e., a shoulder) that is generally perpendicular to the central axis of the rotary base 1 between the first section and the second section. In this way, the rotary head 2 can be fitted onto the second section with the smaller outer diameter. In this embodiment, a flange is provided at one end of the first section opposite to the second section, and the flange is fixed to the traveling frame 400. The rotary head 2 is fitted onto the second section and abuts against the transition surface, so that the rotary head 2 can rotate relative to the rotary base 1 on the second section. One end of the shift fork 3 is fixedly connected to the rotary head 2, and the other end is fixedly connected to the push arm 600, so that the shift fork 3 can rotate with the push arm 600 and drive the rotary head 2 to rotate together. Optionally, the shift fork 3 is integrally provided on the rotary head 2.

[0027] The rotating base 1 has at least one base flow channel inside, each base flow channel having a connecting port and an axial port. The connecting port is located on the peripheral wall of the second section of the rotating base 1, and the axial port is located on the end face of the first section of the rotating base 1 opposite to the second section. Furthermore, each base flow channel may include an axial flow channel portion and a radial flow channel portion extending axially and radially along the rotating base 1, respectively, and communicating with each other. The first end of the axial flow channel portion extends to a predetermined axial end wall of the rotating base 1 to form the axial port, and the radial flow channel portion extends radially from the inner end of the axial flow channel portion to the peripheral wall of the rotating base 1 to form the connecting port. The rotating head 2 has at least one oil flow channel, each oil flow channel having a connecting slot and an end port. A connecting slot is formed on the inner wall surface of the rotary head 2 that engages with the rotary base 1. The longitudinal axis of the oil flow channel extends at an angle or perpendicularly to the rotation axis of the rotary head 2, thereby realizing the flow direction design of hydraulic oil from the pivot to the hose in the push arm. The connecting port on the rotary base 1 and the connecting slot on the rotary head 2 are configured to maintain at least partial overlap on the engagement surface of the rotary head 2 and the rotary base 1, so that the connecting port and the connecting slot can always remain connected to each other within the rotation range of the push arm 600 relative to the main frame 200, thereby ensuring continuous oil supply to the push arm cylinder when the push arm 600 is in the working state. In other words, the push arm 600 can rotate relative to the main frame 200 in the longitudinal direction of the pivot within a preset rotation angle range. The connecting slot can be designed to have a sufficiently long extension range along the circumferential direction of the inner wall of the rotary head 2, so that no matter where the push arm 600 rotates within the preset rotation angle range, the connecting slot and the connecting port will maintain partial overlap and thus maintain fluid communication.

[0028] In this embodiment, the connecting slot of the oil flow channel on the rotary head 2 can be an annular slot, that is, the connecting slot extends completely circumferentially along the mating surface of the rotary head 2 and the rotary base 1 to form a closed annular slot. In this way, the push arm 600 can rotate to any angle, and the connecting slot and the connecting port remain connected to each other, so that the oil circuit rotary device of this embodiment can be set at any required position on the working machinery, and is suitable for more types of working machinery.

[0029] Continue to refer to Figure 1 and Figure 2 As shown, the main frame 200 is equipped with two rigid oil pipes 700 for oil inlet and oil return, respectively, and the push arm 600 is equipped with two flexible hoses 800 for oil inlet and oil return, respectively. Correspondingly, the slewing base 1 may have a first base flow channel 11 and a second base flow channel 12 that are isolated from each other inside, and the slewing head 2 may have a first oil flow channel 21 and a second oil flow channel 22 that are isolated from each other inside. The first base flow channel 11 is fluidly connected to the first connecting slot 212 of the first oil flow channel 21 via its connecting port (first connecting port 111), and is fluidly connected to the rigid oil pipe 700 for oil inlet via its first axial port 112. The second base flow channel 12 is fluidly connected to the second connecting slot 222 of the second oil flow channel 22 via its connecting port (second connecting port 121), and is fluidly connected to the rigid oil pipe 700 for oil return via its second axial port 122. The first end port 211 of the first oil flow channel 21 is connected to the inlet hose 800, and the second end port 221 of the second oil flow channel 22 is connected to the return hose 800. This makes the first base flow channel 11 and the first oil flow channel 21 a transfer section for sending oil flow from the hydraulic system into the pusher cylinder. Specifically, the working valve pressure oil reaches the rotary base port through a rigid pipe passing through the pivot, and then passes through the base flow channel of the rotary base, the oil flow channel of the rotary head, the hose inside the pusher, and the cylinder pipe to reach the cylinder. Similarly, the second base flow channel 12 and the second oil flow channel 22 constitute a transfer section for the return oil flow from the pusher cylinder back to the hydraulic system.

[0030] Optionally, the first connecting port 111 of the first base flow channel 11 and the second connecting port 121 of the second base flow channel 12 are arranged spaced apart from each other in the axial direction of the rotary base 1. The rotary head 2 has a plurality of annular sealing grooves 23 near the connecting slots of each oil flow channel on its mating surface where it engages with the rotary base 1. For example, the rotary head 2 has annular sealing grooves 23 at positions corresponding to the first connecting port 111 and the second connecting port 121 (i.e., the first connecting slot 212 and the second connecting slot 222), at the side of the first connecting slot 212 opposite to the second connecting slot 222, and at the side of the second connecting slot 222 opposite to the first connecting slot 212. The oil circuit rotary device 100 according to this embodiment may further include a plurality of sealing rings 4, which are received one-to-one in the annular sealing groove 23 and elastically abut against the peripheral wall of the rotary base 1, thereby isolating the oil inlet flow path and the oil return flow path at the mating surface and sealing the oil inlet flow path and the oil return flow path. In other embodiments, the annular sealing groove 23 may be provided only on the peripheral wall of the rotary base 1 or formed by sub-grooves formed on the rotary base 1 and the rotary head 2 respectively for jointly receiving the sealing rings 4.

[0031] exist Figure 2 In the illustrated embodiment, the rotary head 2 may also have a support groove 24 formed on its mating surface where it engages with the rotary base 1, particularly on the sides of the first connecting groove 212 and the second connecting groove 222 that are opposite to each other. Of course, if the rotary head 2 has sufficient axial extension length, multiple support grooves 24 can be provided on the rotary head, for example, in the area between the first connecting groove 212 and the second connecting groove 222 and in the area near the end side. The oil circuit rotary device 100 according to this embodiment may also include a support ring, a support ring 5 made of non-metallic wear-resistant material, which is received in the corresponding support groove 24. Its inner ring and outer ring abut against the rotary base 1 and the rotary head 2, respectively, which can strengthen the structural strength of the rotary head. In addition, it is beneficial to reduce or avoid damage to the rotary base 1 and the rotary head 2 made of metallic material due to metal-to-metal friction when the rotary head 2 rotates around the rotary base 1.

[0032] refer to Figure 2 As shown, the oil circuit rotary device 100 according to this embodiment may further include an end cover 6 mounted on the end of the rotary base 1 opposite to its flange portion. When the first axial end of the rotary head 2 abuts against the shoulder between the first and second sections of the rotary base 1, the second axial end of the rotary head 2 abuts against the end cover 6, thereby limiting the rotary head 2 axially relative to the rotary base 1 by clamping the rotary head with the shoulder and the end cover 6.

[0033] In the illustrated embodiment, although the boom is used as an example for explanation, it can be understood that for other types of working machinery different from bulldozers, the movement of the boom can also be transmitted to the slewing head and converted into the rotation of the slewing head by using the shift fork set on the slewing head, so as to achieve continuous delivery of hydraulic oil while meeting the needs of the boom's dynamic movement.

[0034] Industrial applicability

[0035] The hydraulic slewing device according to this invention is particularly suitable for working machinery that has a push arm or rotating arm connected to the main frame or traveling frame and requires pipelines connected to the hydraulic system to be installed in the push arm or rotating arm. However, it should be understood that the hydraulic slewing device according to this invention can also be used in other equipment that requires hydraulic lines to be installed at the slewing joint.

[0036] In existing technologies, push arm cylinders are typically connected to the hydraulic system via hoses exposed on the outer surface of the working machinery. These hoses are easily scratched and damaged by harsh working environments. In contrast, the hydraulic circuit rotary device of this invention has at least one base flow channel formed inside the rotary base 1 and at least one oil flow channel inside the rotary head 2. The base flow channel and the oil flow channel can remain connected within the rotation range of the push arm 600 through the overlap of the connecting port and the connecting slot. The slewing base 1 is fixed to the traveling frame 400, and the slewing head 2 is fixed to the push arm 600 via the shift fork 3. This allows the shift fork and push arm to move together when the push arm 600 is raised or lowered and rotates relative to the traveling frame 400. The shift fork 3 drives the slewing head 2 to rotate relative to the slewing base 1. This ensures that hydraulic oil can be continuously supplied to or out of the push arm cylinder during the dynamic rotation of the push arm 600, even within the limited space of the traveling device pivot and the push arm slewing ball seat. This effectively protects the pipeline of the push arm cylinder.

[0037] Various modifications and variations can be made to the embodiments disclosed above without departing from the scope or spirit of this invention. Other embodiments of this invention will be apparent to those skilled in the art based on the practice of this invention disclosed in this specification. This specification and the examples disclosed herein should be considered illustrative only, and the true scope of this invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic rotary device for operating machinery, characterized in that, The hydraulic rotary device includes a spindle-shaped rotary base, a rotary head that is fitted outside the rotary base and can rotate relative to the rotary base, and a shift fork that is mounted on the rotary head and connected to the boom of the working machine so that the rotary head rotates with the movement of the boom. The rotating base has at least one base flow channel inside it, and the base flow channel has a communication port formed on the peripheral wall of the rotating base. The rotary head is provided with at least one oil flow channel having a communicating slot formed on the inner wall surface of the rotary head that engages with the rotary base. The communicating slot and the communicating port of the base flow channel are positioned corresponding to each other and configured to maintain at least partial overlap on the engagement surface of the rotary head and the rotary base within the range of motion of the boom and thus communicate with each other.

2. The oil passage switchover device according to claim 1, characterized by The connecting slot is an annular slot.

3. The oil passage switchover device according to claim 2, characterized by The rotating base has a first base flow channel and a second base flow channel that are isolated from each other inside. The rotating head has a first oil flow channel and a second oil flow channel that are isolated from each other. The connecting port of the first base flow channel is connected to the connecting slot of the first oil flow channel, so that the first base flow channel and the first oil flow channel constitute a transfer section for the oil inlet flow path. The connecting port of the second base flow channel is connected to the connecting slot of the second oil flow channel, so that the second base flow channel and the second oil flow channel constitute a transfer section for the oil return flow path.

4. The oil passage switchover device according to claim 3, characterized by The first base flow channel and the second base flow channel each include an axial flow channel and a radial flow channel that communicate with each other. The axial flow channel extends to a predetermined axial end wall of the rotating base, and the radial flow channel terminates at the communication port of the corresponding base flow channel.

5. The oil passage switchover device according to claim 4, characterized by The connecting ports of the first base flow channel and the second base flow channel are arranged at intervals along the axial direction of the rotary base. On the mating surface where the rotary head and the rotary base engage, an annular sealing groove for receiving the sealing ring is provided near the connecting slot of each oil flow channel.

6. The oil passage switchover device according to claim 5, characterized by The rotary head has a support groove on its mating surface where it engages with the rotary base for receiving the support ring.

7. The oil passage switchover device according to any one of claims 1 to 6, characterized by The first axial end of the rotary head abuts against a shoulder formed on the rotary base, and the second axial end of the rotary head abuts against an end cap mounted on the end of the rotary base, thereby limiting the rotary head in the axial direction relative to the rotary base.

8. A work machine characterized by, Includes the oil circuit rotary device according to any one of claims 1 to 7.

9. A work machine according to claim 8, characterised in that The operating machinery includes bulldozers.

10. The operating machinery according to claim 9, characterized in that, The operating machinery also includes a main frame, a traveling frame connected to the main frame via a pivot, and a push arm connected to the traveling frame via a slewing ball seat. The pivot is provided with a pivot hole, the slewing ball seat is provided with a seat hole, and a slewing base extends through the seat hole. The first axial end of the slewing base is connected to the traveling frame, and the second axial end of the slewing base extends into the push arm. A rigid oil pipe provided in the pivot hole communicates with a base flow channel provided on the slewing base. The oil flow channel of the slewing head communicates with a hose connected to the push arm cylinder. The shift fork is fixedly connected to the push arm.

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