Oil return back pressure valve integrated block for excavator

Abstract

The utility model discloses an oil return back pressure valve integrated block for an excavator, which belongs to the technical field of mechanical engineering and comprises an integrated block body, a first three-way piece is arranged at the bottom of the integrated block body and fixedly connected with a first four-way piece, and the first four-way piece comprises a first oil way connector and a second oil way connector. The first oil way connector is fixedly connected with a second flange, and the second oil way connector is fixedly connected with a third flange. The opening of the second flange is larger than that of the third flange; the high-pressure back pressure valve is connected with the second oil way connector, and the low-pressure back pressure valve is connected with the first oil way connector. The first oil way connector is connected with a first oil way, and the second oil way connector is connected with a second oil way. In this way, the integrated block body is directly connected with the two back pressure valves, oil ways of the oil tank-main valve and the main valve-hydraulic system are controlled through the two back pressure valves, and the integrated block body can be directly connected with the rotary motor. The integrated block is simple in structure and convenient to install, the production efficiency can be effectively improved, the installation space is saved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical engineering, and in particular relates to an oil return back pressure valve integrated block for an excavator. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Hydraulic excavators mainly provide power to actuators through the pressure generated by the flow of pressurized oil in the hydraulic system. The pressurized oil in the hydraulic oil tank enters the main valve through the main pump, and then flows back to the hydraulic oil tank from the oil outlet of the main valve. The back-pressure valve is connected in series to the system circuit, and the spring force in the back-pressure valve is used to automatically adjust the opening and closing of the pipeline according to the system pressure, so that the oil outlet maintains a certain pressure, prevents the hydraulic cylinder and hydraulic motor from creeping, improves the system speed rigidity, and prevents pipeline suction and cavitation.

[0004] like Figure 1 , Figure 2 As shown, in the prior art, a return oil block 30 with a back pressure valve 20 is usually arranged on the hydraulic oil tank 10, a transition block 50 is arranged on the valve body 40, and an oil pipeline is arranged between the return oil block and one end of the transition block. This method requires the back pressure valve 20 to be installed in the return oil block 30, sealed with a plug, and then the return oil block 30 is installed on the hydraulic oil tank and then connected to the transition block 50, and the other end of the transition block 50 is also connected to the cooling system through the return oil block. This structure of arranging a back pressure valve in the return oil block and then connecting the transition block is relatively complicated, and its assembly efficiency is low. The combination of the return oil block and the transition block also increases the cost. Utility Model Content

[0005] In view of the above problems, the utility model provides an oil return back pressure valve integrated block for an excavator, which can be connected to the main valve after being threaded with two back pressure valves, and then directly connected to the oil tank, cooling system, and rotary motor through the oil return pipeline. The overall structure is simple, the assembly efficiency is high, and the cost is low.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A return oil back pressure valve integrated block for an excavator comprises an integrated block body, the bottom of the integrated block body is a first three-way piece, the first three-way piece is fixedly connected to the first four-way piece, the first four-way piece comprises a first oil circuit interface and a second oil circuit interface, the first oil circuit interface is fixedly connected to a second flange, and the second oil circuit interface is fixedly connected to a third flange; the opening of the second flange is larger than the opening of the third flange, and the first oil circuit interface and the second oil circuit interface are both provided with internal threads; the high-pressure back pressure valve is threadedly connected to the second oil circuit interface, and the low-pressure back pressure valve is threadedly connected to the first oil circuit interface; the first oil circuit interface is connected to the first oil circuit, and the second oil circuit interface is connected to the second oil circuit.

[0008] Preferably, one side opening of the first three-way piece is a main valve interface, and the side opposite to the main valve interface is closed. The main valve interface is fixedly connected to a first flange, and four screw holes are symmetrically arranged on the first flange.

[0009] Preferably, the top end of the first three-way piece is consistent with the inner diameter of the outer wall of the bottom end of the first four-way piece; the top opening of the first four-way piece is a motor oil supply interface, the outer wall of the motor oil supply interface has an external thread, and is connected to a third oil pipeline with an internal threaded connector of corresponding size.

[0010] Preferably, symmetrical screw holes are provided on the second flange and the third flange; the head of the high-pressure back-pressure valve passes through the second flange and the first oil circuit interface, and then passes through the third flange, and the tail of the high-pressure back-pressure valve is spirally connected and fixed with the internal thread inside the second oil circuit interface.

[0011] Preferably, after the high-pressure back-pressure valve is connected and fixed to the second oil circuit interface, the tail of the low-pressure back-pressure valve is screwed into the first oil circuit interface from the second flange opening and is spirally connected and fixed with the internal thread inside the first oil circuit interface.

[0012] Preferably, a fourth flange is provided on the first oil circuit, a fifth flange is provided on the second oil circuit, the fourth flange is adapted for use with the second flange, and the fifth flange is adapted for use with the third flange.

[0013] Preferably, the integrated block body is mounted on the main valve, connected to the cooling system through a first oil circuit, connected to the oil tank through a second oil circuit, and connected to the rotary motor through a third oil circuit.

[0014] Compared with the prior art, the utility model has the following advantages and positive effects:

[0015] The integrated block body in the utility model is directly threadedly connected to the two back-pressure valves, and controls the oil circuits of the oil tank-main valve and the main valve-hydraulic system through the two back-pressure valves. The integrated block body can also be connected to the rotary motor through the motor oil replenishment interface and the corresponding oil circuit; the integrated block structure in the utility model is simpler and more convenient to install, which can improve production efficiency, save installation space and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0017] Figure 1 It is a schematic diagram of a transition block connected to an oil return block in an oil return pipeline in the prior art;

[0018] Figure 2 It is a cross-sectional view of an oil return block in the prior art;

[0019] Figure 3 It is a front view of the integrated block of the embodiment of the utility model;

[0020] Figure 4 It is a left view of the integrated block of the embodiment of the utility model;

[0021] Figure 5 It is a right side view of the integrated block of the embodiment of the utility model;

[0022] Figure 6 It is a front view of the integrated block connected to the back pressure valve of the embodiment of the utility model;

[0023] Figure 7 It is a front view of the integrated block connecting pipeline of the embodiment of the utility model;

[0024] Figure 8 It is a schematic diagram of the integrated block of the embodiment of the utility model connected to the oil return pipeline;

[0025] In the figure:

[0026] 10-hydraulic oil tank, 20-back pressure valve, 30-oil return block, 40-valve body, 50-transition block, 1-integrated block body, 11-first three-way piece, 111-main valve interface, 112-first flange, 12-first four-way piece, 121-motor oil replenishment interface, 122-first oil circuit interface, 123-second oil circuit interface, 124-second flange, 125-third flange, 126-high pressure back pressure valve, 127-low pressure back pressure valve, 2-first oil circuit, 21-fourth flange, 3-second oil circuit, 31-fifth flange, 4-main valve, 5-oil tank, 6-third oil circuit. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0028] The utility model is described in detail below in conjunction with the accompanying drawings. The embodiment disclosed in this embodiment is an oil return back pressure valve integrated block for an excavator, such as Figure 3 , Figure 4 , Figure 5 As shown, it includes an integrated block body 1, the bottom of the integrated block body 1 is a first three-way piece 11, one side of the first three-way piece is opened as a main valve interface 111, and the side opposite to the main valve interface 111 is closed, the main valve interface 111 is fixedly connected with a first flange 112, the top of the first three-way piece is consistent with the inner diameter of the bottom outer wall of the first four-way piece 12, and the two are fixedly connected, the top opening of the first four-way piece 12 is a motor oil replenishment interface 121, the first four-way piece 12 also includes a first oil circuit interface 122 and a second oil circuit interface 123, the first oil circuit interface 122 is fixedly connected with a second flange 124, and the second oil circuit interface 123 is fixedly connected with a third flange 125.

[0029] In this embodiment, if Figure 3 As shown, four screw holes are symmetrically arranged on the first flange 112 for fixing the main valve interface 111 to the corresponding interface of the main valve 4; the outer wall of the motor oil replenishing interface 121 has an external thread, which is connected to the third oil circuit 6 with an internal thread connector of corresponding size.

[0030] In this embodiment, if Figure 4 , Figure 5 As shown, the second flange 124 and the third flange 125 are both provided with symmetrical screw holes, the opening of the second flange 124 is larger than the opening of the third flange 125, and the first cross-piece 12 is provided with internal threads inside, that is, the first oil circuit interface 122 and the second oil circuit interface 123 are provided with internal threads on their inner walls; Figure 6 As shown, the high-pressure back-pressure valve 126 penetrates from the second flange 124 and the first oil circuit interface 122, the head of the high-pressure back-pressure valve 126 passes through the third flange 125, the tail of the high-pressure back-pressure valve 126 is provided with an external thread, and the tail of the high-pressure back-pressure valve 126 is spirally connected and fixed with the internal thread inside the second oil circuit interface 123.

[0031] In this embodiment, if Figure 7As shown, after the tail of the high-pressure back-pressure valve 126 is screwed and fixed with the internal thread inside the second oil circuit interface 123, the tail of the low-pressure back-pressure valve 127 is screwed into the first oil circuit interface 122 from the opening of the second flange 124, and is screwed and fixed with the internal thread inside the first oil circuit interface 122. It can be understood that in this embodiment, the internal thread inside the first cross-piece 12 is matched with the external thread of the tail of the high-pressure back-pressure valve and the low-pressure back-pressure valve.

[0032] like Figure 7 As shown, a fourth flange 21 is provided on the first oil circuit 2, and a fifth flange 31 is provided on the second oil circuit 3. The fourth flange 21 is adapted for use with the second flange 124, and the fifth flange 31 is adapted for use with the third flange 125. The first oil circuit 2 is fixedly connected to the first oil circuit interface 122 by bolts, and the second oil circuit 3 is fixedly connected to the second oil circuit interface 123 by bolts, and the low-pressure back-pressure valve 127 and the high-pressure back-pressure valve 126 are connected to the oil circuit.

[0033] In this embodiment, if Figure 8 As shown, the manifold body 1 is mounted on the main valve 4, connected to the cooling system (not shown in the figure) through the first oil circuit 2, connected to the oil tank 5 through the second oil circuit 3, and connected to the rotary motor (not shown in the figure) through the third oil circuit 6. In this embodiment, the manifold body 1 can be directly threaded to two back pressure valves, and the oil circuits of the oil tank-main valve and the main valve-hydraulic system can be controlled through the two back pressure valves. The manifold body 1 can also be connected to the rotary motor through the motor oil replenishment interface and the corresponding oil circuit.

[0034] When returning oil, the hydraulic oil flowing out of the main valve enters the manifold body 1, first passes through the low-pressure back-pressure valve, is cooled by the cooling system, and then returns to the hydraulic oil tank; when the cooling system is blocked, the pressure in the pipeline increases, the high-pressure back-pressure valve opens, and the hydraulic oil can directly return to the tank. At the same time, when returning oil, the rotary motor can also be replenished with oil through the motor oil replenishment interface.

[0035] The integrated block structure of this embodiment is simpler and more convenient to install, which can improve production efficiency, save installation space and reduce production costs.

[0036] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. An oil return back pressure valve manifold for an excavator, characterized in that: It includes an integrated block body, the bottom of the integrated block body is a first three-way piece, the first three-way piece is fixedly connected to the first four-way piece, the first four-way piece includes a first oil circuit interface and a second oil circuit interface, the first oil circuit interface is fixedly connected to the second flange, and the second oil circuit interface is fixedly connected to the third flange; the opening of the second flange is larger than the opening of the third flange, and the first oil circuit interface and the second oil circuit interface are both provided with internal threads; the high-pressure back-pressure valve is threadedly connected to the second oil circuit interface, and the low-pressure back-pressure valve is threadedly connected to the first oil circuit interface; the first oil circuit interface is connected to the first oil circuit, and the second oil circuit interface is connected to the second oil circuit.

2. The oil return back pressure valve integrated block for excavators according to claim 1, characterized in that: One side opening of the first three-way piece is the main valve interface, and the side opposite to the main valve interface is closed. The main valve interface is fixedly connected to a first flange, and four screw holes are symmetrically arranged on the first flange.

3. The oil return back pressure valve integrated block for excavators according to claim 1, characterized in that: The top end of the first three-way piece is consistent with the inner diameter of the outer wall of the bottom end of the first four-way piece; the top opening of the first four-way piece is a motor oil supply interface, the outer wall of the motor oil supply interface has an external thread, and is connected to a third oil pipeline with an internal threaded connector of corresponding size.

4. The oil return back pressure valve integrated block for excavators as claimed in claim 1, characterized in that: Symmetrical screw holes are provided on the second flange and the third flange; the head of the high-pressure back-pressure valve passes through the second flange and the first oil circuit interface, and then passes through the third flange, and the tail of the high-pressure back-pressure valve is spirally connected and fixed with the internal thread inside the second oil circuit interface.

5. The oil return back pressure valve integrated block for excavators according to claim 1, characterized in that: After the high-pressure back-pressure valve is connected and fixed to the second oil circuit interface, the tail of the low-pressure back-pressure valve is screwed into the first oil circuit interface from the second flange opening and is screwed and fixed to the internal thread inside the first oil circuit interface.

6. The oil return back pressure valve integrated block for excavators as claimed in claim 1, characterized in that: The first oil circuit is provided with a fourth flange, the second oil circuit is provided with a fifth flange, the fourth flange is adapted for use with the second flange, and the fifth flange is adapted for use with the third flange.

7. The oil return back pressure valve integrated block for excavators as claimed in claim 2, characterized in that: The integrated block body is fixedly mounted on the main valve via the first flange, connected to the cooling system via the first oil circuit, connected to the oil tank via the second oil circuit, and connected to the rotary motor via the third oil circuit.

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