Excavator control valve capable of regenerating potential energy

Abstract

The utility model relates to a hydraulic component, in particular to a potential energy regeneration excavator control valve, which comprises a main oil path I and a main oil path II which are respectively provided with a walking joint, a bucket joint, a large arm joint, a small arm joint and a bypass cut-off joint. The big arm 1 is connected with a holding valve I and a two-position three-way slide valve I; the innovation point is that a potential energy regeneration oil way is additionally arranged, a potential energy regeneration link is arranged on the potential energy regeneration oil way and comprises a two-position two-way proportional valve, a second holding valve and a second two-position three-way slide valve, and connection between a rodless cavity of the large arm oil cylinder and the potential energy regeneration oil way is achieved. When the excavator big arm descends, potential energy is recycled and reused through signal transmission. The design provides a new energy-saving scheme for the hydraulic system of the excavator.

Description

Technical Field

[0001] The utility model relates to hydraulic components, in particular to an excavator control valve with potential energy regeneration. Background Technique

[0002] In a hydraulic system, improving energy efficiency is one of the key objectives in design and optimization. The "regeneration" technology is an important means to achieve this goal. Traditionally, "regeneration" usually refers to designing a specific circuit so that after the hydraulic oil completes one working cycle, it can be guided to another part of the system or the actuator instead of directly returning to the oil storage tank. This design utilizes the pressure energy of the hydraulic oil itself, reduces energy waste, and improves the overall efficiency of the system.

[0003] However, although the use of the pressure energy of hydraulic oil for energy regeneration in hydraulic systems has been applied to a certain extent, the utilization of gravitational potential energy is rarely precedent, especially in the operation of heavy machinery such as excavators. When the boom descends, due to the gravitational force, additional pressure will be generated in the rodless cavity of the boom cylinder, thus forming a large amount of potential energy. In the existing hydraulic systems, this part of the energy is often not effectively captured and utilized, but dissipated in the form of heat or other forms, resulting in potential energy losses. Summary of the Utility Model

[0004] The utility model precisely provides a control valve that can recover and reuse the potential energy converted by gravity, which can not only further improve energy efficiency but also bring innovative improvements to the design and operation of hydraulic systems. For this purpose, the technical solution adopted by the utility model is as follows:

[0005] An excavator control valve with potential energy regeneration includes a first main oil circuit and a second main oil circuit. The main oil circuit is configured with a straight travel connection, a left travel connection, a bucket connection, a boom 1 connection, a stick 2 connection, and a bypass cut-off connection. The second main oil circuit is configured with a right travel connection, a swing connection, a standby connection, a boom 2 connection, and a stick 1 connection. Among them, the boom 1 connection is configured with a holding valve 1 for locking and a two-position three-way slide valve 1. Different from the prior art, it also includes a potential energy regeneration oil circuit between the first main oil circuit and the second main oil circuit. The potential energy regeneration oil circuit is configured with a potential energy regeneration connection. The potential energy regeneration connection includes a two-position two-way proportional valve, a holding valve 2, and a two-position three-way slide valve 2. The side oil port of the holding valve 1 is communicated with the side oil port of the holding valve 2 and jointly connected to the rodless cavity of the boom cylinder. The signal port of the two-position three-way slide valve 1 is communicated with the signal port of the two-position three-way slide valve 2. The oil outlet of the holding valve 2 is connected to the normally closed port 1 of the two-position two-way proportional valve. The normally closed port 2 of the two-position two-way proportional valve is communicated with the potential energy regeneration oil circuit. When the boom of the excavator descends, a signal is transmitted to the signal port of the two-position two-way proportional valve to conduct the two normally closed ports.

[0006] Further, the potential energy regeneration oil circuit is connected to the right travel union, slewing union, standby union, boom 2 union, and / or arm 1 union.

[0007] Further, a check valve is connected in series between the normally closed port 2 of the two-position two-way proportional valve and the potential energy regeneration oil circuit, and the check valve blocks the reverse flow from the potential energy regeneration oil circuit to the two-position two-way proportional valve.

[0008] Further, the signal port of the two-position two-way proportional valve is connected to a solenoid valve, and an inductive switch is installed under the boom of the excavator, and the inductive switch is connected to the solenoid valve.

[0009] Further, when the operator controls the boom of the excavator to rise, although the oil pressure in the rodless cavity of the boom cylinder increases under the action of the high-pressure oil provided by the first main oil circuit, since there is no signal input at the signal port of the two-position two-way proportional valve, the two-position two-way proportional valve is in the normally closed state, keeping the oil outlet of valve 2 blocked. At this time, the valve side cavity of holding valve 2 is connected to the spring cavity, and due to the area difference and spring force, holding valve 2 is in the locked state; when the operator controls the boom of the excavator to lower, at this time, there is a signal input at the signal port of the two-position two-way proportional valve. Although there is no high-pressure oil provided by the first main oil circuit, the lowering of the boom causes the volume of the rodless cavity of the cylinder to become smaller and the oil pressure to increase. First, it is conducted to the signal port of the two-way three-position spool valve 2, and the two-way three-position spool valve 2 changes its direction. The spring cavity of holding valve 2 is drained of oil, and the oil outlet of holding valve 2 is opened. The high-pressure oil flows from the rodless cavity of the boom cylinder through the side oil port of holding valve 2, the oil outlet of holding valve 2, the two-position two-way proportional valve, and / or the check valve and is supplied to the rodless cavity of the cylinders controlled by the right travel union, slewing union, standby union, boom 2 union, and / or arm 1 union.

[0010] Compared with the prior art, the excavator control valve with potential energy regeneration of the present invention has the following beneficial technical effects:

[0011] Improve energy efficiency: Through the design of the potential energy regeneration oil circuit, the present invention can capture and reuse the gravitational potential energy generated when the boom of the excavator descends, thereby reducing the energy waste caused by energy dissipation and improving the energy efficiency of the entire hydraulic system.

[0012] Innovative potential energy utilization: The present invention realizes the effective recovery and reuse of gravitational potential energy in the hydraulic system of heavy machinery such as excavators for the first time, providing a new energy-saving idea for the design and operation of hydraulic systems.

[0013] Optimize system performance: Through the precise control of the potential energy regeneration union, the present invention can intelligently adjust the flow direction and pressure of hydraulic oil under different working conditions, optimizing the operation performance and response speed of the excavator.

[0014] Reducing environmental impact: Since the energy loss is reduced, the present utility model helps to reduce the heat generation of the hydraulic system during operation, thereby reducing the thermal pollution to the environment.

[0015] Extending equipment life: By reducing the heat energy generated by the hydraulic oil due to energy loss, the present utility model helps to lower the operating temperature of the hydraulic system, thus extending the service life of hydraulic components and reducing the maintenance cost.

[0016] Enhancing operation safety: The design of the potential energy regeneration oil circuit allows for smoother control of the flow of hydraulic oil during the lowering of the boom, reducing the equipment damage or operation risks that may be caused by hydraulic shock.

[0017] Improving economic efficiency: By improving energy efficiency and reducing maintenance costs, the present utility model can bring lower operating costs to the excavator operator, improving the economic efficiency.

[0018] Easy to integrate and maintain: The potential energy regeneration control valve of the present utility model has a simple design, is easy to integrate with the existing hydraulic system, and is easy to maintain, which is conducive to popularization and application. Description of the drawings

[0019] Figure 1 is the overall hydraulic schematic diagram of the present utility model.

[0020] Figure 2 is Figure 1 the enlarged view of the potential energy regeneration connection in

[0021] Reference numerals in the figure: Main oil circuit 1 - 1, Main oil circuit 2 - 2, Potential energy regeneration oil circuit - 3, Potential energy regeneration connection - 4, Straight travel connection - 5, Left travel connection - 6, Bucket connection - 7, Boom 1 connection - 8, Arm 2 connection - 9, Bypass cut-off connection - 10, Right travel connection - 11, Swing connection - 12, Spare connection - 13, Boom 2 connection - 14, Arm 1 connection - 15, Holding valve 1 - 81, Two-position three-way slide valve 1 - 82, Two-position two-way proportional valve - 41, Holding valve 2 - 42, Two-position three-way slide valve 2 - 43, Check valve - 44, Solenoid valve - 30, Signal port of two-position three-way slide valve 2 - PbL43, Outlet port of holding valve 2 - RO42, Signal port of two-position two-way proportional valve - Xctc, Lateral oil port of holding valve 1 - Ab81, Lateral oil port of holding valve 2 - Ab42. Detailed implementation manners

[0022] The following will further elaborate on the detailed implementation manners of the present utility model in the form of combining with the drawings. However, the following embodiments only list the relatively preferred embodiments, which only serve to explain and help understand the present utility model, and should not be construed as a limitation to the present utility model.

[0023] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0024] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] An excavator control valve with potential energy regeneration as shown in the figure includes main oil circuit 1 and main oil circuit 2. A straight travel union 5, a left travel union 6, a bucket union 7, a boom 1 union 8, a forearm 2 union 9 and a bypass cut-off union 10 are arranged on the main oil circuit 1. A right travel union 11, a swing union 12, a standby union 13, a boom 2 union 14 and a forearm 1 union 15 are arranged on the main oil circuit 2. Among them, the boom 1 union 8 is equipped with a holding valve 1 81 and a two-position three-way slide valve 1 82 for locking. There is also a potential energy regeneration oil circuit 3 between the main oil circuit 1 and the main oil circuit 2. A potential energy regeneration union 4 is arranged on the potential energy regeneration oil circuit 3. The potential energy regeneration union 4 includes a two-position two-way proportional valve 41, a holding valve 2 42 and a two-position three-way slide valve 2 43. The side oil port Ab81 of the holding valve 1 is communicated with the side oil port Ab42 of the holding valve 2 and is jointly connected to the rodless cavity of the boom cylinder. The signal port PbL82 of the two-position three-way slide valve 1 and the signal port PbL43 of the two-position three-way slide valve 2 are communicated. The oil outlet RO42 of the holding valve 2 is connected to the normally closed port 1 of the two-position two-way proportional valve. The normally closed port 2 of the two-position two-way proportional valve is communicated with the potential energy regeneration oil circuit 3. When the boom of the excavator descends, a signal is transmitted to the signal port Xctc of the two-position two-way proportional valve to conduct the two normally closed ports. The boom 1 union 8 is equipped with a holding valve 1 81 and a two-position three-way slide valve 1 82 to control the movement of the boom cylinder.

[0026] When the operator controls the boom of the excavator to rise, although the oil pressure in the rodless cavity of the boom cylinder increases under the action of the high-pressure oil provided by the main oil circuit 1, since there is no signal input to the signal port Xctc of the two-position two-way proportional valve, the two-position two-way proportional valve 41 is in a normally closed state, and the oil outlet RO42 of the holding valve 2 is cut off. At this time, the valve side cavity of the holding valve 2 is connected to the spring cavity. Due to the area difference and the spring force, the holding valve 2 is in a locked state. Since there is no signal input to the signal port Xctc of the two-position two-way proportional valve, the two-position two-way proportional valve 41 remains in a normally closed state, and the holding valve 2 is also in a locked state. The oil pressure in the rodless cavity of the boom cylinder increases but does not flow to the potential energy regeneration oil circuit 3.

[0027] When the operator controls the boom of the excavator to lower, at this time, there is a signal input at the signal port Xctc of the two-position two-way proportional valve. Although there is no high-pressure oil provided by the main oil circuit -1, the lowering of the boom causes the volume of the rodless chamber of the oil cylinder to become smaller and the oil pressure to increase. First, it is conducted to the signal port PbL43 of the two-position three-way slide valve II. The two-position three-way slide valve II 43 changes its direction, the spring chamber of the holding valve II 42 is drained of oil, and the oil outlet RO42 of the holding valve II is opened. The high-pressure oil flows from the rodless chamber of the boom oil cylinder through the side oil port Ab42 of the holding valve II, the oil outlet RO42 of the holding valve II, the two-position two-way proportional valve 41, and the check valve 44 to be supplied to the rod chambers of the oil cylinders controlled by the right travel union 11, the swing union 12, the standby union 13, the boom 2 union 14, and / or the arm 1 union 15.

[0028] The check valve 44 ensures that the hydraulic oil can only flow from the two-position two-way proportional valve 41 to the potential energy regeneration oil circuit 3 and cannot flow reversely. This prevents the oil from flowing back to the proportional valve when the boom rises or the pressure of the hydraulic system changes, thus protecting the stability and accuracy of the control valve. Preventing the reverse flow of oil can reduce the pressure fluctuations and unexpected actions in the hydraulic system and enhance the safety of the excavator operation.

[0029] In another preferred embodiment, the signal port Xctc of the two-position two-way proportional valve is connected to an electromagnetic valve, and an induction switch is installed under the boom of the excavator. The induction switch is connected to the electromagnetic valve. The induction switch can detect the position change of the boom in real time. When the boom descends, the induction switch immediately sends a signal to the electromagnetic valve to achieve a fast response. After receiving the signal, the electromagnetic valve can accurately control the opening and closing of the two-position two-way proportional valve 41 to ensure the accuracy of the potential energy regeneration process and the accuracy of the control valve operation. Through the cooperation of the induction switch and the electromagnetic valve, the automatic control of the boom movement of the excavator is realized, reducing the manual intervention of the operator and improving the degree of automation of the operation.

[0030] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principle and purpose of the present invention. Simple combination changes thereof are all within the protection scope of the present invention.

Claims

1. A potential energy regeneration excavator control valve, comprising a main oil circuit 1 (1) and a main oil circuit 2 (2), wherein the main oil circuit 1 (1) is provided with a linear travel link (5), a left travel link (6), a bucket link (7), a boom 1 link (8), a forearm 2 link (9) and a bypass cut-off link (10), and the main oil circuit 2 (2) is provided with a right travel link (11), a rotary link (12), a standby link (13), a boom 2 link (14) and a forearm 1 link (15); wherein the boom 1 link (8) is provided with a locking retaining valve 1 (81) and a two-position three-way slide valve 1 (82), characterized in that: It also includes a potential energy regeneration oil circuit (3) between the main oil circuit 1 (1) and the main oil circuit 2 (2), wherein a potential energy regeneration link (4) is arranged on the potential energy regeneration oil circuit (3), wherein the potential energy regeneration link (4) includes a two-position two-way proportional valve (41), a holding valve 2 (42) and a two-position three-way slide valve 2 (43), wherein the lateral oil port (Ab81) of the holding valve 1 is connected to the lateral oil port (Ab42) of the holding valve 2 and is commonly connected to the rodless chamber of the boom oil cylinder, the signal port (PbL82) of the two-position three-way slide valve 1 is connected to the signal port (PbL43) of the two-position three-way slide valve 2, the oil outlet (RO42) of the holding valve 2 is connected to the normally closed port 1 of the two-position two-way proportional valve, the normally closed port 2 of the two-position two-way proportional valve is connected to the potential energy regeneration oil circuit (3), and when the boom of the excavator is lowered, a signal is transmitted to the signal port (Xctc) of the two-position two-way proportional valve to connect the two normally closed ports.

2. The potential energy regeneration excavator control valve according to claim 1, characterized in that: The potential energy regeneration oil circuit (3) is connected to the right traveling link (11), the slewing link (12), the standby link (13), the upper arm 2 link (14) and / or the lower arm 1 link (15).

3. The potential energy regeneration excavator control valve according to claim 1, characterized in that: A one-way valve (44) is connected in series between the normally closed port 2 of the two-position two-way proportional valve and the potential energy regeneration oil circuit (3), and the one-way valve (44) blocks backflow from the potential energy regeneration oil circuit (3) to the two-position two-way proportional valve (41).

4. The potential energy regeneration excavator control valve according to claim 1, characterized in that: The signal port (Xctc) of the two-position two-way proportional valve is connected to the solenoid valve, and an induction switch is installed under the excavator boom, and the induction switch is connected to the solenoid valve.

5. A potential energy regeneration excavator control valve according to any one of claims 1 to 4, characterized in that: When the operator controls the boom of the excavator to rise, although the oil pressure in the rodless chamber of the boom cylinder increases under the action of the high-pressure oil provided by the main oil circuit 1 (1), since there is no signal input to the signal port (Xctc) of the two-position two-way proportional valve, the two-position two-way proportional valve (41) is in a normally closed state, and the oil outlet (RO42) of the holding valve 2 is cut off. At this time, the valve side chamber of the holding valve 2 (42) is connected to the spring chamber. Due to the area difference and the spring force, the holding valve 2 (42) is in a locked state. When the operator controls the boom of the excavator to descend, there is a signal input to the signal port (Xctc) of the two-position two-way proportional valve. Although there is no high-pressure oil provided by the main oil circuit 1 (1), the boom is The lowering of the arm causes the volume of the rodless chamber of the oil cylinder to decrease, and the oil pressure increases. The oil pressure is first transmitted to the signal port (PbL43) of the two-position three-way slide valve 2. The two-position three-way slide valve 2 (43) is switched, and the spring chamber of the holding valve 2 (42) is unloaded. The oil outlet (RO42) of the holding valve 2 is opened, and the high-pressure oil flows from the rodless chamber of the boom oil cylinder through the lateral oil port (Ab42) of the holding valve 2, the oil outlet (RO42) of the holding valve 2, the two-position two-way proportional valve (41) and / or the one-way valve (44) to the rod chamber of the oil cylinder controlled by the right travel link (11), the slewing link (12), the standby link (13), the boom 2 link (14) and / or the arm 1 link (15).

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