A docking device

Abstract

The present invention relates to the technical field of operating machinery, and in particular to a docking device. A docking device comprises a first joint and at least one second joint, each of the first joint and the second joint is connected to a corresponding working oil circuit, the first working oil circuit corresponding to the first joint is connected to an oil tank, and the second working oil circuits corresponding to all the second joints are connected to the oil leakage working oil circuit through an oil leakage circuit, and a control valve group is provided on the oil leakage circuit to control the flow of hydraulic oil on the oil leakage circuit. When the accessory quick-connect is docked with the second joint, the core of the accessory quick-connect can push the hydraulic oil in the second joint to drain to the oil tank through the oil leakage circuit and the first working oil circuit, and the docking of the joints can be completed without loosening the quick-change joint, which solves the technical problem in the prior art that when the quick-connect on the whole machine is docked with the quick-connect on the accessory, the quick-change joint needs to be loosened to successfully dock the joints, the operation is cumbersome, and multiple loosening may damage the joints.

Description

Technical Field

[0001] The invention relates to the technical field of operating machinery, and in particular to a docking device. Background Art

[0002] As a kind of engineering machinery with multiple attachments, the skid steer loader is characterized by the fact that one machine can be equipped with hundreds of attachments, which greatly broadens the application scope of the skid steer loader. However, since the attachments need to be replaced when using different attachments, the whole machine is generally equipped with quick connectors, which can facilitate the replacement of various attachments and improve work efficiency.

[0003] When replacing accessories, since the quick-connect on the whole machine is connected to the reversing valve, when the quick-connect on the accessory is connected to the quick-connect on the whole machine, the oil between the quick-change connector and the reversing valve is sealed in the pipeline due to the middle valve core of the reversing valve, and the oil in the accessory pipeline is also sealed between the quick-connect and the hydraulic component due to the quick-connect, which results in the pair of quick-connects that need to be connected being sealed with oil with residual pressure at both ends. The quick-connect needs to compress the oil in the pipeline during the connection process. Since the oil at both ends of the quick-connect is sealed pressure oil that cannot be compressed, the quick-connect cannot be connected. The quick-change connector must be loosened before it can be successfully connected. Summary of the invention

[0004] In order to solve the technical problems in the prior art that when the quick-connect on the whole machine is connected with the quick-connect on the attachment, the quick-change connector needs to be loosened to successfully connect the connector, which is troublesome to operate and may damage the connector by loosening it multiple times, the present invention proposes a docking device to solve the above technical problems. The technical solution of the present invention is as follows:

[0005] A docking device comprises a first joint and at least one second joint, each of the first joint and the second joint is connected to a corresponding working oil circuit, the first working oil circuit corresponding to the first joint is connected to an oil tank, and the second working oil circuits corresponding to all the second joints are connected to the oil leakage working oil circuit through an oil leakage circuit, and a control valve group is provided on the oil leakage circuit to control the circulation of hydraulic oil on the oil leakage circuit.

[0006] The docking device of the present invention is connected to the oil tank by setting the first working oil circuit corresponding to the first joint, and the second working oil circuit corresponding to the second joint is connected to the first working oil circuit through the oil drain circuit. In this way, when the accessory quick connector is docked with the second joint, the core of the accessory quick connector can push the hydraulic oil in the second joint to drain to the oil tank through the oil drain circuit and the first working oil circuit. In this way, the docking of the joints can be completed without loosening the quick-change joints, which is easy to operate and will not damage the joints.

[0007] According to one embodiment of the present invention, the control valve group includes a one-way control valve and a switching valve. The hydraulic oil in the second working oil circuit flows unidirectionally to the switching valve under the control of the one-way control valve, and then enters the first working oil circuit under the control of the switching valve or is sealed in the pipeline by the switching valve.

[0008] According to one embodiment of the present invention, the oil leakage circuit includes at least one branch oil circuit and a main oil circuit, each branch oil circuit is respectively connected to the corresponding second joint and the main oil circuit, and the main oil circuit is connected to the first working oil circuit.

[0009] According to one embodiment of the present invention, the one-way control valve includes a one-way valve arranged on each branch oil line.

[0010] According to one embodiment of the present invention, the one-way control valve comprises a shuttle valve, which is arranged at the connection point between the branch oil circuit and the main oil circuit, and the hydraulic oil on the branch oil circuit flows unidirectionally to the main oil circuit through the shuttle valve.

[0011] According to one embodiment of the present invention, the switching valve has two working positions. When the switching valve is in the first working position, the main oil circuit is opened, and the hydraulic oil in the second joint can flow to the working oil circuit of the first joint through the oil drain circuit for oil return; when the switching valve is in the second working position, the main oil circuit is unidirectionally opened and opposite to the flow direction of the one-way control valve, and the hydraulic oil in the second joint is sealed in the pipeline.

[0012] According to one embodiment of the present invention, it further includes a hydraulic pump, which supplies oil to the first joint and the second joint.

[0013] According to one embodiment of the present invention, a control valve is further included, and the hydraulic pump supplies oil to the first connector and the second connector under the control of the control valve.

[0014] According to one embodiment of the present invention, the control valve has a pressure oil port p and a plurality of working oil ports, the pressure oil port p is connected to the pump outlet of the hydraulic pump, and the plurality of working oil ports are respectively connected to the first working oil circuit and the second working oil circuit, and when the control valve is in a neutral position, the pressure oil port p is only connected to the working oil port corresponding to the first connector, and the working oil ports corresponding to the second connector are all in a disconnected state.

[0015] According to one embodiment of the present invention, the pump outlet of the hydraulic pump is also connected to the oil tank through an overflow oil circuit, and an overflow valve is provided on the overflow oil circuit.

[0016] Based on the above technical solution, the technical effects that can be achieved by the present invention are:

[0017] 1. The docking device of the present invention is provided with a first working oil circuit corresponding to the first joint being connected to the oil tank, and a second working oil circuit corresponding to the second joint being connected to the second working oil circuit through an oil drain circuit. Thus, when the accessory quick-connection is docked with the second joint, the core of the accessory quick-connection can push the hydraulic oil in the second joint to drain to the oil tank through the oil drain circuit and the first working oil circuit. Thus, the docking of the joints can be completed without loosening the quick-change joints, which is convenient to operate and will not damage the joints.

[0018] 2. The docking device of the present invention is provided with a control valve group on the oil leakage oil circuit to control the flow of hydraulic oil on the oil leakage oil circuit. Specifically, the control valve group includes a one-way control valve and a switching valve. The one-way control valve controls the hydraulic oil in each second working oil circuit to flow to the switching valve in one direction. The switching valve controls the hydraulic oil flowing to the switching valve to enter the first working oil circuit through the switching valve for oil leakage, so as to facilitate the second joint to connect the attachment; or, the hydraulic oil flowing to the switching valve cannot be leaked through the switching valve and is sealed in the pipeline, so that the hydraulic oil can participate in the work of the attachment in each pipeline; specifically, the switching valve is provided with two working positions. When the switching valve is located at the first working position, the main oil circuit is conducted, and the hydraulic oil in the second joint can flow to the first working oil circuit through the oil leakage oil circuit for oil return, that is, the docking device is in a docking state and can be quickly connected to the attachment for docking; when the switching valve is located at the second working position, the main oil circuit is conducted in one direction, and the flow direction is opposite to the flow direction of the one-way control valve, and the hydraulic oil in the second joint is sealed in the pipeline, that is, the docking device is in a sealed and pressure-maintaining state;

[0019] 3. In the docking device of the present invention, the oil drain circuit includes a branch oil circuit and a main oil circuit, which can connect the second working oil circuit corresponding to the second joint to the first working oil circuit. By setting a one-way valve on the branch oil circuit or setting a shuttle valve between the branch oil circuit and the main oil circuit, it can ensure that the hydraulic oil on the second working oil circuit flows to the main oil circuit in one direction. Then, a switching valve is set on the main oil circuit to switch the docking state and the sealing and pressure-maintaining state of the docking device;

[0020] 4. The docking device of the present invention further comprises a hydraulic pump and a control valve. The hydraulic pump supplies oil to the first joint and the second joint respectively under the control of the control valve. When the control valve is in the middle position, the pressure oil pumped out by the hydraulic pump can flow to the first working oil circuit through the control valve, and then flow to the oil tank for oil return. No oil is supplied to the second joint. At this time, the switching valve can be adjusted to the first working position to facilitate the quick connection of the attachment and the second joint. After the attachment is docked, the switching valve can be adjusted to the second working position, and the control valve can switch to control the operation of different attachments.

[0021] 5. The docking device of the present invention is also provided with an overflow oil circuit and an overflow valve to prevent the oil pressure of the oil circuit system from being too high. When the oil pressure is too high, the pressure oil can be directly discharged through the overflow oil circuit and the overflow valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a hydraulic system diagram of the docking device of the present invention;

[0023] In the figure: 1-first joint; 11-first working oil circuit; 2-second joint; 21-second working oil circuit; 3-drain oil circuit; 31-branch oil circuit; 32-main oil circuit; 4-control valve group; 41-one-way control valve; 42-switching valve; 5-oil tank; 6-hydraulic pump; 7-control valve; 8-overflow oil circuit; 81-overflow valve. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0027] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0030] like Figure 1 As shown, this embodiment provides a docking device, including a hydraulic pump 6 and at least two connectors, the connectors are used for quick docking with accessories, the hydraulic pump 6 supplies oil to at least two connectors under the control of a control valve 7, and the accessories work under the action of pressurized oil.

[0031] The at least two joints include a first joint 1 and at least one second joint 2. The first joint 1 is connected to a first working oil circuit 11, and each second joint 2 is connected to a second working oil circuit 21. The pressure oil pumped by the hydraulic pump 6 enters each working oil circuit under the control of the control valve 7, and drives the corresponding attachments to work through each joint. Specifically, the first working oil circuit 11 connected to the first joint 1 is connected to the oil tank 5, and the second working oil circuit 21 connected to the second joint 2 is connected to the first working oil circuit 11 through the oil drain circuit 3. The hydraulic oil in the second joint 2 can enter the oil tank 5 through the second working oil circuit 21, the oil drain circuit 3 and the first working oil circuit 11 in sequence to achieve oil drain.

[0032] The oil drain circuit 3 includes a branch oil circuit 31 and a main oil circuit 32. The number of the branch oil circuits 31 is the same as the number of the second joints 2. The branch oil circuit 31 is used to connect the second working oil circuit 21 corresponding to the second joint 2 with the main oil circuit 32. One end of the main oil circuit 32 is connected to all the branch oil circuits 31, and the other end of the main oil circuit 32 is connected to the first working oil circuit 11. In this way, the hydraulic oil in each second joint 2 can be drained to the oil tank 5 through the corresponding second working oil circuit 21, the corresponding branch oil circuit 31, the main oil circuit 32 and the first working oil circuit 11 in sequence.

[0033] In order to control the flow of hydraulic oil on the oil leakage circuit 3, a control valve group 4 is also provided on the oil leakage circuit 3. The control valve group 4 includes a one-way control valve 41 and a switching valve 42. During the oil leakage process, the one-way control valve 41 is located upstream of the switching valve 42. The hydraulic oil on each second working oil circuit 21 flows to the switching valve 42 in a one-way manner under the control of the one-way control valve 41, and then enters the first working oil circuit 11 or is sealed in the pipeline under the control of the switching valve 42. Specifically, the one-way control valve 41 may include at least one one-way valve, which is respectively arranged in each branch oil circuit 31 to control the one-way flow of oil in each branch oil circuit 31; in addition, the one-way control valve 41 may also be set as a shuttle valve, which is arranged at the connection between the branch oil circuit 31 and the main oil circuit 32, and the hydraulic oil on the branch oil circuit 31 flows to the main oil circuit 32 in a one-way manner through the shuttle valve. Specifically, the switching valve 42 is a two-position two-way valve. When the switching valve 42 is located in the first working position, the main oil circuit 32 is conducted, and the hydraulic oil flowing to the switching valve 42 can enter the first working oil circuit 11 through the switching valve 42 for oil leakage; when the switching valve 42 is located in the second working position, the main oil circuit 32 is unidirectionally conducted and is opposite to the flow direction of the one-way control valve 41, and the hydraulic oil in each second joint 2 is sealed in the pipeline and cannot be leaked. Further specifically, the switching valve 42 has an inlet and an outlet, the inlet is connected to the branch oil circuit 31, and the outlet is connected to the first working oil circuit 11. When the switching valve 42 is located in the first working position, the inlet and outlet of the switching valve 42 are connected, and the hydraulic oil in the second joint 2 can be drained, which is convenient for docking; when the switching valve 42 is located in the second working position, the outlet of the switching valve 42 is unidirectionally connected to the inlet, and the hydraulic oil in each second joint 2 is sealed in the pipeline. The switching valve 42 may be a hydraulically controlled two-position two-way valve or a two-position two-way solenoid valve.

[0034] The hydraulic pump 6 supplies oil to the first joint 1 and the second joint 2 under the control of the control valve 7. The control valve 7 has a pressure oil port p and at least two working oil ports. The pressure oil port p of the control valve 7 is connected to the pump outlet of the hydraulic pump 6, and the working oil port of the control valve 7 is respectively connected to the first working oil circuit 11 and the second working oil circuit 21. When the control valve 7 is in the middle position, the pressure oil port p is connected to the working oil port corresponding to the first joint 1, and the other working oil ports are in a disconnected state. The working oil pumped out by the hydraulic pump 6 enters the first working oil circuit 11 and then flows to the oil tank 5 for oil return. When the control valve 7 is in the middle position, the switch valve 42 can be adjusted to be located in the first working position, and the attachment quick connector can be docked with the second joint 2. The core of the attachment quick connector can push the hydraulic oil in the second joint 2 to drain to the oil tank 5 through the oil drain circuit 3 and the first working oil circuit 11, so as to facilitate the docking. After the attachment is docked, the switch valve 42 can be adjusted to be located in the second working position, and the control valve 7 can be switched to supply oil to the second joint 2 to drive the corresponding attachment to work.

[0035] In this embodiment, there are two second joints 2, and there are also two branch oil circuits 31. Shuttle valves are provided at the connection points between the two branch oil circuits 31 and the main oil circuit 32. The shuttle valves can be single-ball shuttle valves or double-ball shuttle valves, as long as they can control the one-way flow of hydraulic oil. The control valve 7 is a three-position six-way valve, which has two pressure oil ports p and three working oil ports a, b, and c. The two pressure oil ports p are connected to the pump outlet of the hydraulic pump 6, the working oil port a is connected to the first working oil circuit 11, and the working oil ports b and c are connected to the two second working oil circuits 21 respectively. When the control valve 7 is in the middle position, one pressure oil port p is connected to the working oil port a, and the other oil ports are in a disconnected state; when the control valve 7 is in the left position, the pressure oil port p is connected to the working oil port b, and the pressure oil port p supplies oil to one second joint 2; when the control valve 7 is in the right position, the pressure oil port p is connected to the working oil port c, and the pressure oil port p supplies oil to another second joint 2.

[0036] In order to ensure the safety of the hydraulic system, the pump outlet of the hydraulic pump 6 is also connected to the oil tank 5 through the overflow oil circuit 8. An overflow valve 81 is provided on the overflow oil circuit 8. When the oil pressure at the pump outlet of the hydraulic pump 6 is too high, the pressure oil can directly return to the oil tank 5 through the overflow oil circuit 8 and the overflow valve 81.

[0037] Based on the above structure, the docking device of this embodiment can set the control valve 7 to be in the middle position and the switching valve 42 to be in the first working position when the second joint 2 is docked with the accessory quick connect. The core of the accessory quick connect can push the hydraulic oil in the second joint 2 to drain to the oil tank 5 through the oil drain circuit 3 and the first working oil circuit 11, and the accessory quick connect and the second joint 2 can be easily docked. After the docking is completed, the switching valve 42 is set to the second working position, and the control valve 7 is reversed to supply oil to the corresponding accessory.

[0038] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A docking device, comprising a first joint (1) and at least one second joint (2), each first joint (1) and each second joint (2) being connected to a corresponding working oil circuit, characterized in that: The first working oil circuit (11) corresponding to the first joint (1) is in communication with the oil tank (5), and the second working oil circuits (21) corresponding to all the second joints (2) are in communication with the first working oil circuit (11) via the oil drain circuit (3), and the oil drain circuit (3) is provided with a control valve group (4) to control the flow of hydraulic oil on the oil drain circuit (3); The control valve group (4) comprises a one-way control valve (41) and a switching valve (42); the hydraulic oil in the second working oil circuit (21) flows in one direction to the switching valve (42) under the control of the one-way control valve (41), and then enters the first working oil circuit (11) under the control of the switching valve (42) or is sealed in the pipeline by the switching valve (42); The oil drain circuit (3) comprises at least one branch oil circuit (31) and a main oil circuit (32), each branch oil circuit (31) being connected to a corresponding second joint (2) and the main oil circuit (32), and the main oil circuit (32) being connected to the first working oil circuit (11); The one-way control valve (41) comprises a shuttle valve, which is arranged at the connection point between the branch oil circuit (31) and the main oil circuit (32), and the hydraulic oil on the branch oil circuit (31) flows in a one-way manner to the main oil circuit (32) through the shuttle valve; It also comprises a hydraulic pump (6), wherein the hydraulic pump (6) supplies oil to the first joint (1) and the second joint (2).

2. A docking device according to claim 1, characterized in that: The switching valve (42) has two working positions. When the switching valve (42) is in the first working position, the main oil circuit (32) is opened, and the hydraulic oil in the second joint (2) can flow through the oil drain circuit (3) to the first working oil circuit (11) for oil return. When the switching valve (42) is in the second working position, the main oil circuit (32) is opened in a unidirectional manner and is opposite to the flow direction of the one-way control valve (41), and the hydraulic oil in the second joint (2) is sealed in the pipeline.

3. A docking device according to claim 2, characterized in that: It also comprises a control valve (7), and the hydraulic pump (6) supplies oil to the first connector (1) and the second connector (2) under the control of the control valve (7).

4. A docking device according to claim 3, characterized in that: The control valve (7) has a pressure oil port p and a plurality of working oil ports, the pressure oil port p being connected to the pump outlet of the hydraulic pump (6), and the plurality of working oil ports being connected to the first working oil circuit (11) and the second working oil circuit (21), respectively. When the control valve (7) is in a neutral position, the pressure oil port p is only connected to the working oil port corresponding to the first connector (1), and the working oil ports corresponding to the second connector (2) are all in a disconnected state.

5. A docking device according to any one of claims 3-4, characterized in that: The pump outlet of the hydraulic pump (6) is also connected to the oil tank (5) via an overflow oil circuit (8), and an overflow valve (81) is provided on the overflow oil circuit (8).

Images