Energy-saving cylinders, energy-saving hydraulic systems and construction machinery

Abstract

The present application relates to the technical field of engineering machinery, and in particular to an energy-saving oil cylinder, an energy-saving hydraulic system and engineering machinery, wherein the first piston is arranged in the action chamber to separate the action chamber into a first rod chamber and a first rodless chamber, the first rod chamber and the first rodless chamber are both sealed chambers and are both used to connect to an oil pump, and also includes an accumulator, and a second piston rod and a second piston connected to each other, the second piston rod is connected to the first piston rod, the cylinder body also has an energy storage chamber, the second piston is arranged in the energy storage chamber to separate the energy storage chamber into a second rod chamber and a second rodless chamber, the second rod chamber is connected to the first rod chamber, and the second rodless chamber is connected to the accumulator so that the accumulator stores energy when the first piston moves toward the first rodless chamber. The present application can avoid the technical difficulty of the boom's gravitational potential energy being completely converted into heat energy and causing waste during the boom's descent.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to an energy-saving oil cylinder, an energy-saving hydraulic system and engineering machinery. Background Art

[0002] At present, for construction machinery with booms, such as excavators and grabbers, the raising and lowering of the booms are generally controlled by oil cylinders. During the boom lowering process, the gravitational potential energy of the boom will be converted into heat energy loss, resulting in energy waste. Summary of the invention

[0003] The purpose of the present application is to provide an energy-saving oil cylinder, an energy-saving hydraulic system and an engineering machinery, so as to avoid the technical problem that the gravitational potential energy of the boom is completely converted into heat energy and wastes during the process of the boom being lowered.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions:

[0005] One aspect of the present application provides an energy-saving oil cylinder, comprising: a cylinder body, and a first piston rod and a first piston connected to each other, the cylinder body having an action chamber, the first piston being arranged in the action chamber to separate the action chamber into a first rod chamber and a first rodless chamber, the first rod chamber and the first rodless chamber being both sealed chambers and both being used to connect to an oil pump,

[0006] It also includes an accumulator, and a second piston rod and a second piston connected to each other, the second piston rod is connected to the first piston rod, the cylinder body also has an energy storage chamber, the second piston is arranged in the energy storage chamber to separate the energy storage chamber into a second rod chamber and a second rodless chamber, the second rod chamber is connected to the first rod chamber, and the second rodless chamber is connected to the accumulator so that the accumulator can store energy when the first piston moves toward the first rodless chamber.

[0007] Preferably, the cross section of the energy storage chamber is circular, the cross section of the action chamber is annular, and the energy storage chamber is coaxially arranged with the action chamber. Compared with arranging the energy storage chamber and the action chamber in parallel, arranging the energy storage chamber and the action chamber coaxially can reduce the space occupied by the cylinder body, thereby providing sufficient installation space for other components on the engineering machinery.

[0008] Preferably, a connecting piece is included, the first piston is annular and matches the working chamber, the first piston rod is a cylindrical structure coaxially arranged with the first piston, and the first piston rod and the second piston rod are connected as a whole through a connecting piece. By making the first piston annular, it can better match with the working chamber, and by making the first piston rod a cylindrical structure, there can be more positions connected to the movable arm in the circumferential direction of the first piston, so that the power transmission between the first piston rod and the movable arm is more stable.

[0009] Preferably, the cross section of the energy storage chamber is annular, the cross section of the action chamber is circular, and the energy storage chamber and the action chamber are coaxially arranged.

[0010] Another aspect of the present application provides an energy-saving hydraulic system, comprising the above-mentioned energy-saving cylinder.

[0011] Preferably, there are two energy-saving oil cylinders, which enables the energy-saving hydraulic system to have greater power based on the boom, and can increase the installation points of the boom, thereby improving the stability of the boom movement.

[0012] Preferably, the two energy-saving oil cylinders share the same accumulator, which not only improves the utilization rate of the accumulator, but also reduces the production cost of the energy-saving hydraulic system provided by the embodiment of the present application.

[0013] Preferably, an oil pump and a multi-way valve are included, and the oil pump is connected to the first rod chamber and the first rodless chamber through the multi-way valve. By controlling the multi-way valve, the oil inlet and outlet of the first rod chamber and the first rodless chamber can be controlled, and the energy storage and release of the accumulator can also be controlled.

[0014] Preferably, a holding valve is included, and the holding valve is installed in the oil path between the multi-way valve and the first rodless chamber. Through the holding valve, when the load acting on the oil cylinder is large, each piston rod will automatically drop or the drop speed exceeds the controlled speed. The holding valve can apply back pressure to the oil cylinder to balance the load, so that the movement speed of each piston rod decreases.

[0015] A third aspect of the present application provides an engineering machinery comprising the above-mentioned energy-saving hydraulic system.

[0016] The technical solution provided by this application can achieve the following beneficial effects:

[0017] When the energy-saving cylinder, energy-saving hydraulic system and engineering machinery provided by the embodiment of the present application are in use, the first piston rod and the second piston rod are both connected to the boom, and when each piston rod extends out of the cylinder body, the boom is lifted, and when each piston rod retracts into the cylinder body, the boom is lowered; when the boom is lowered, the hydraulic oil enters the first rod chamber, and the first piston and the first piston rod are lowered, thereby driving the second piston and the second piston rod and the boom to descend, and at the same time, the gravity of the boom will act on the hydraulic oil in the second rodless chamber through the second piston, so that the hydraulic oil enters the accumulator and the accumulator accumulates energy. When the boom needs to be lifted, the hydraulic oil enters the first rodless chamber and acts on the first piston. At the same time, the accumulator releases the recovered energy and acts on the second piston to help lift the boom, thereby realizing the utilization of the recovered energy. The energy-saving cylinder provided by the embodiment of the present application can not only realize the recovery of the gravitational potential energy of the boom when the boom is lowered, but also reuse the gravitational potential energy when the boom is lifted, thereby achieving the purpose of energy saving.

[0018] The additional technical features and advantages of the present application will be more clearly explained in the following description, or can be understood through the specific practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the specific implementation methods of the present application, the following is a brief introduction to the drawings required for the description of the specific implementation methods. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of an energy-saving hydraulic system provided in an embodiment of the present application.

[0021] Reference numerals:

[0022] 1-Oil pump; 2-Multi-way valve;

[0023] 3-first rodless cavity; 4-second rod-containing cavity;

[0024] 5-first rod chamber; 6-first piston rod;

[0025] 7-second piston rod; 8-connecting piece;

[0026] 9-second rodless chamber; 10-first piston;

[0027] 11-second piston; 12-holding valve;

[0028] 13-Accumulator; 14-Cylinder body. DETAILED DESCRIPTION

[0029] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0030] like Figure 1 As shown, one aspect of the present application provides an energy-saving oil cylinder, comprising: a cylinder body 14, and a first piston rod 6 and a first piston 10 connected to each other, the cylinder body 14 has an action chamber, the first piston 10 is arranged in the action chamber to separate the action chamber into a first rod chamber 5 and a first rodless chamber 3, the first rod chamber 5 and the first rodless chamber 3 are both sealed chambers and are used to connect to an oil pump 1,

[0031] It also includes an accumulator 13, and a second piston rod 7 and a second piston 11 connected to each other. The second piston rod 7 is connected to the first piston rod 6. The cylinder body 14 also has an energy storage chamber. The second piston 11 is arranged in the energy storage chamber to separate the energy storage chamber into a second rod chamber 4 and a second rodless chamber 9. The second rod chamber 4 is connected to the first rod chamber 5, and the second rodless chamber 9 is connected to the accumulator 13 so that the accumulator 13 can store energy when the first piston 10 moves toward the first rodless chamber 3.

[0032] When the energy-saving oil cylinder provided in the embodiment of the present application is in use, the first piston rod 6 and the second piston rod 7 are both connected to the boom, and when each piston rod extends out of the cylinder body 14, the boom is lifted, and when each piston rod retracts into the cylinder body 14, the boom is lowered; when the boom is lowered, the hydraulic oil enters the first rod chamber 5 and the second rod chamber 4, and the first piston 10 and the first piston rod 6 descend, the second piston 11 and the second piston rod 7 and the boom descend, and at the same time, the gravity of the boom will act on the hydraulic oil in the second rodless chamber 9 through the second piston 11, so that the hydraulic oil enters the accumulator 13, and the accumulator 13 accumulates energy. When the boom needs to be lifted, the hydraulic oil enters the first rodless chamber 3 and acts on the first piston 10. At the same time, the accumulator 13 releases the recovered energy and acts on the second piston 11 to help lift the boom and realize the utilization of the recovered energy.

[0033] The energy-saving cylinder provided in the embodiment of the present application can not only recover the gravitational potential energy of the boom when the boom is lowered, but also reuse the gravitational potential energy when the boom is raised, thereby achieving the purpose of energy saving.

[0034] Preferably, the cross section of the energy storage chamber is circular, the cross section of the action chamber is annular, and the energy storage chamber and the action chamber are coaxially arranged. Compared with arranging the energy storage chamber and the action chamber in parallel, arranging the energy storage chamber and the action chamber coaxially can reduce the space occupied by the cylinder body 14, thereby providing sufficient installation space for other components on the engineering machinery.

[0035] Preferably, the energy-saving oil cylinder provided in the embodiment of the present application includes a connecting piece 8, the first piston 10 is annular and matches with the action chamber, the first piston rod 6 is a cylindrical structure coaxially arranged with the first piston 10, and the first piston rod 6 and the second piston rod 7 are connected as a whole through the connecting piece 8. By making the first piston 10 annular, it can better match with the action chamber, and by making the first piston rod 6 a cylindrical structure, there can be more positions connected with the boom in the circumferential direction of the first piston 10, so that the power transmission between the first piston rod 6 and the boom is more stable.

[0036] Preferably, the cross section of the energy storage chamber is annular, the cross section of the action chamber is circular, and the energy storage chamber and the action chamber are coaxially arranged.

[0037] Another aspect of the present application provides an energy-saving hydraulic system, including the energy-saving cylinder provided by the above-mentioned embodiment of the present application.

[0038] The energy-saving hydraulic system provided in the embodiment of the present application, by adopting the energy-saving cylinder provided in the embodiment of the present application, can not only realize the recovery of the gravitational potential energy of the boom when the boom is lowered, but also can reuse the gravitational potential energy when the boom is raised, thereby achieving the purpose of energy saving.

[0039] Preferably, there are two energy-saving oil cylinders. This enables the energy-saving hydraulic system to have greater power based on the boom, and can increase the installation points of the boom and improve the stability of the boom movement.

[0040] Preferably, the two energy-saving oil cylinders share the same accumulator 13. This not only improves the utilization rate of the accumulator 13, but also reduces the production cost of the energy-saving hydraulic system provided in the embodiment of the present application.

[0041] Preferably, the energy-saving hydraulic system provided in the embodiment of the present application includes an oil pump 1 and a multi-way valve 2, and the oil pump 1 is connected to the first rod chamber 5 and the first rodless chamber 3 through the multi-way valve 2. By controlling the multi-way valve 2, the oil inlet and outlet of the first rod chamber 5 and the first rodless chamber 3 can be controlled, and the energy storage and release of the accumulator 13 are also controlled.

[0042] Preferably, the energy-saving hydraulic system provided in the embodiment of the present application includes a holding valve 12, which is installed in the oil circuit between the multi-way valve 2 and the first rodless chamber 3. Through the holding valve 12, when the load acting on the oil cylinder is large, each piston rod will automatically drop or the drop speed exceeds the controlled speed. The holding valve 12 can apply a back pressure balance load to the oil cylinder to reduce the movement speed of each piston rod.

[0043] The third aspect of the present application provides an engineering machinery, including the energy-saving hydraulic system provided by the above-mentioned embodiment of the present application.

[0044] The engineering machinery provided in the embodiment of the present application, by adopting the energy-saving hydraulic system provided in the embodiment of the present application, can not only recover the gravitational potential energy of the boom when the boom is lowered, but also reuse the gravitational potential energy when the boom is raised, thereby achieving the purpose of energy saving.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Energy-saving oil cylinder, characterized in that: include: A cylinder body (14), and a first piston rod (6) and a first piston (10) connected to each other, wherein the cylinder body (14) has an action chamber, and the first piston (10) is arranged in the action chamber to separate the action chamber into a first rod chamber (5) and a first rodless chamber (3), wherein the first rod chamber (5) and the first rodless chamber (3) are both sealed chambers and are used to connect to an oil pump (1). It also includes an accumulator (13), and a second piston rod (7) and a second piston (11) connected to each other, the second piston rod (7) is connected to the first piston rod (6), the cylinder body (14) also has an energy storage chamber, the second piston (11) is arranged in the energy storage chamber to separate the energy storage chamber into a second rod chamber (4) and a second rodless chamber (9), the second rod chamber (4) is connected to the first rod chamber (5), and the second rodless chamber (9) is connected to the accumulator (13) so that when the first piston (10) moves toward the first rodless chamber (3), hydraulic oil enters the accumulator (13) for energy storage.

2. The energy-saving oil cylinder according to claim 1, characterized in that: The cross section of the energy storage chamber is circular, the cross section of the action chamber is annular, and the energy storage chamber and the action chamber are coaxially arranged.

3. The energy-saving oil cylinder according to claim 2, characterized in that: It comprises a connecting piece (8), the first piston (10) is annular and matches the working chamber, the first piston rod (6) is a cylindrical structure coaxially arranged with the first piston (10), and the first piston rod (6) and the second piston rod (7) are connected as a whole via the connecting piece (8).

4. The energy-saving oil cylinder according to claim 1, characterized in that: The cross section of the energy storage chamber is annular, the cross section of the action chamber is circular, and the energy storage chamber and the action chamber are coaxially arranged.

5. Energy-saving hydraulic system, characterized in that: It comprises an energy-saving oil cylinder as described in any one of claims 1 to 4.

6. The energy-saving hydraulic system according to claim 5, characterized in that: There are two energy-saving oil cylinders.

7. The energy-saving hydraulic system according to claim 6, characterized in that: The two energy-saving oil cylinders share the same accumulator (13).

8. The energy-saving hydraulic system according to claim 5, characterized in that: It comprises an oil pump (1) and a multi-way valve (2), wherein the oil pump (1) is connected to the first rod chamber (5) and the first rodless chamber (3) via the multi-way valve (2).

9. The energy-saving hydraulic system according to claim 8, characterized in that: It comprises a holding valve (12), wherein the holding valve (12) is installed on the oil path between the multi-way valve (2) and the first rodless chamber (3).

10. Construction machinery, characterized in that: Comprising an energy-saving hydraulic system as described in any one of claims 5-9.

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