Two-way regeneration valve, regeneration method using the same, and excavator

Abstract

The present invention discloses a two-way regeneration valve and a regeneration method and an excavator using the two-way regeneration valve. The A" and B" oil ports are connected to the rod chamber and rodless chamber of the bucket cylinder; the regeneration selection valve oil outlet is connected to the A" and B" oil ports respectively, and the regeneration selection valve oil inlet is connected to the one-way valve I and the one-way valve II respectively; the one-way valve II is connected to the A" oil port; the one-way valve I is connected to the regeneration stop valve, and the regeneration stop valve is connected to the B" oil port; the regeneration control valve oil outlet is connected to the two control ends of the regeneration selection valve respectively, and the regeneration control valve oil inlet is connected to the A" and B" oil ports respectively; the two control ends of the regeneration stop valve are connected to the A" and B" oil ports respectively. The oil circuit structure of the present invention is simple and compact, easy to process and operate, and fully utilizes the hydraulic system's own characteristics and the effect of external load during the hydraulic excavator bucket swinging outward and the bucket retracting. The regeneration valve is used to realize the two-way regeneration function of the oil, thereby achieving the purpose of energy saving of the hydraulic excavator and improving the working efficiency at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic excavators, in particular to a two-way regeneration valve, a regeneration method using the two-way regeneration valve, and an excavator. Background Art

[0002] With the rapid development of construction machinery, the requirements for energy efficiency, control comfort, and other indicators of construction machinery are becoming increasingly stringent. In particular, the pursuit of energy consumption for medium, large, and ultra-large tonnage excavators is becoming increasingly "demanding." There are also higher requirements for component lightweighting, reliability, compact structure, and multifunctionality. At the same time, higher requirements are also placed on the integration of component functions.

[0003] A Chinese patent discloses an excavator boom regeneration valve (CN105065714A). It comprises a valve sleeve, a plug threadedly connected to one end of the sleeve, and a valve head connected to the other end of the sleeve. A fixed seat is located within the sleeve, abutting the plug. An elastic member is connected to the fixed seat at one end. A valve core, slidably connected to the sleeve, is connected to the other end of the elastic member at one end. The other end of the valve core abuts the valve head. A plunger, slidably connected to the valve core, is inserted centrally at the end of the valve head that extends into the sleeve. A first radial through-hole is defined in the valve head, located outside the sleeve. One end of the plunger extends through the end of the valve head and abuts the valve core. The other end of the plunger extends into the first radial through-hole. An annular groove is defined around the valve core, and the valve sleeve is provided with second and third radial through-holes that mate with the annular groove. This inventive structure adjusts the amount of hydraulic oil regeneration during boom retraction based on the actual excavator operating conditions.

[0004] The shortcomings of the above technology are:

[0005] (1) The arm regeneration valve has a complex structure and is not easy to process. The regeneration valve has a single function and can only recover energy during the bucket retraction process, but not during the outward swing process. This limits its scope of use.

[0006] (2) The regeneration valve cannot automatically control the on / off of the bucket's inward and outward swing energy recovery according to the operating conditions. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides a two-way regeneration valve and a regeneration method and excavator using the two-way regeneration valve, which can not only realize the flow regeneration of the bucket inward and outward swing, but also realize the automatic closing and opening function of the flow regeneration according to the actual working conditions.

[0008] The present invention is achieved through the following technical solutions: a two-way regeneration valve, including a regeneration stop valve, a regeneration selection valve and a regeneration control valve; the A" oil port is connected to the rod chamber of the bucket cylinder, and the B" oil port is connected to the rodless chamber of the bucket cylinder; the oil outlet of the regeneration selection valve is respectively connected to the A" oil port and the B" oil port, and the oil inlet of the regeneration selection valve is respectively connected to a one-way valve I and a one-way valve II; the one-way valve II is connected to the A" oil port; the one-way valve I is connected to the regeneration stop valve, and the regeneration stop valve is connected to the B" oil port; the oil outlet of the regeneration control valve is respectively connected to the two control ends of the regeneration selection valve, and the oil inlet of the regeneration control valve is respectively connected to the A" oil port and the B" oil port; the two control ends of the regeneration stop valve are respectively connected to the A" oil port and the B" oil port.

[0009] It is further characterized in that: the regeneration stop valve is a two-position two-way valve; a throttle valve I is installed in the oil circuit from the B" oil port to the regeneration control valve and the left control end of the regeneration stop valve; a throttle valve II is installed in the oil circuit from the A" oil port to the right control end of the regeneration control valve.

[0010] The regeneration control valve is a two-position five-way solenoid valve, and the regeneration control valve spring chamber and oil return port are connected to the oil tank; a throttle valve III is installed in the oil circuit from the A" oil port to the regeneration control valve oil inlet.

[0011] The regeneration selection valve is a three-position three-way valve.

[0012] A regeneration method comprising the following steps:

[0013] a. When the bucket swings outward, oil enters the rod chamber of the bucket cylinder.

[0014] Under the action of bucket gravity and bucket cylinder rod cavity pressure, when the bucket cylinder rodless cavity pressure is greater than the bucket cylinder rod cavity pressure, the bucket cylinder rodless cavity oil flows through the regeneration stop valve and check valve I to the regeneration selection valve;

[0015] The regeneration control valve moves to the left under the action of the current. The oil pressure of the A and B ports acts on the regeneration selection valve through the regeneration control valve. The oil pressure in the rodless cavity of the bucket cylinder is greater than the rod cavity pressure of the bucket cylinder. The regeneration selection valve moves to the right under the action of the oil pressure in the rodless cavity of the bucket cylinder.

[0016] The rightward movement of the regeneration selection valve causes the oil in the rodless chamber of the bucket cylinder to flow through the regeneration selection valve to the rod chamber of the bucket cylinder, thus realizing flow regeneration;

[0017] b. When the bucket is retracted, the bucket cylinder does not have a rod cavity that allows oil to flow in.

[0018] Under the action of bucket gravity and bucket cylinder rodless cavity pressure, when the bucket cylinder rod cavity pressure is greater than the bucket cylinder rodless cavity pressure, the bucket cylinder rod cavity oil flows through the one-way valve II to the regeneration selection valve;

[0019] The regeneration control valve moves left under the action of the current. The oil pressure of the A and B ports acts on the regeneration selection valve through the regeneration control valve. The oil pressure in the rod chamber of the bucket cylinder is greater than the pressure in the rodless chamber of the bucket cylinder. The regeneration selection valve moves left under the action of the oil pressure in the rod chamber of the bucket cylinder.

[0020] The left shift of the regeneration selection valve causes the oil in the rod chamber of the bucket cylinder to flow through the regeneration selection valve to the rodless chamber of the bucket cylinder, realizing flow regeneration.

[0021] It is further provided that: the regeneration control valve realizes the on and off of the electromagnet by receiving the displacement signal or pressure signal of the bucket cylinder.

[0022] An excavator adopts a two-way regeneration valve.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) Fully utilizing the gravity of the bucket cylinder's inward and outward swing can achieve flow regeneration during the bucket cylinder's inward and outward swing process, and can realize energy recovery during the bucket's outward and inward swing process, thus achieving maximum energy saving;

[0025] (2) The one-way valve logic oil circuit is used to realize the maximum pressure selection function. At the same time, the regeneration selection valve is used to realize the regeneration oil circuit self-selection function under the pressure of the bucket cylinder A and B chambers, realizing the intelligence and simplification of the oil circuit;

[0026] (3) By receiving external signals (pressure, displacement), the regeneration control valve can be turned on and off, thereby controlling the regeneration oil circuit. The regeneration stop valve is used to realize the bucket excavation function, thereby avoiding the influence of the regeneration oil circuit on the bucket excavation force.

[0027] The two-way regeneration valve has a simple structure, diverse functions, a compact structure and a high degree of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a hydraulic principle diagram of the bidirectional regeneration valve of the present invention;

[0029] In the figure: throttle valve I1, regeneration stop valve 2, throttle valve II3, throttle valve III4, one-way valve I5, one-way valve II6, regeneration selection valve 7, regeneration control valve 8, fuel tank 9, bucket cylinder 10. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0031] like Figure 1 As shown, a two-way regeneration valve includes a regeneration stop valve 2, a regeneration selection valve 7 and a regeneration control valve 8; its A" oil port is connected to the rod cavity of the bucket cylinder 10, and the B" oil port is connected to the rodless cavity of the bucket cylinder 10.

[0032] The regeneration selector valve 7 is a three-position, three-way valve. Its two oil outlets are connected to port A" and port B" respectively. One oil inlet of the regeneration selector valve 7 is connected to a check valve I5 and a check valve II6. Check valve II6 is connected to port A". Check valve I5 is connected to the oil outlet of regeneration shut-off valve 2, and the oil inlet of regeneration shut-off valve 2 is connected to port B".

[0033] Regeneration control valve 8 is a two-position, five-way solenoid valve. Its spring chamber and oil return port are connected to tank 9. Its two oil outlets are connected to the two control terminals of regeneration selector valve 7, while its two oil inlets are connected to ports A and B, respectively. A throttle valve III 4 is installed in the oil line from port A to the inlet of regeneration control valve 8.

[0034] Regeneration shutoff valve 2 is a two-position, two-way valve. Its two control terminals are connected to port A and port B, respectively. A throttle valve I1 is installed in the oil circuit from port B to regeneration control valve 8 and the left control terminal of regeneration shutoff valve 2. A throttle valve II3 is installed in the oil circuit from port A to the right control terminal of regeneration control valve 8. Example

[0035] An excavator employs the bidirectional regenerative valve of Example 1. The rod chamber and rodless chamber of the bucket cylinder 10 are connected to the A and B ports of the excavator's main valve, respectively. The pilot oil ports XAK and XBK, which control the oil inflow to ports A and B, are connected to the pilot oil pipes XAK and XBK of the bucket connection of the excavator's main valve, respectively. Ports A" and B" communicate with the A and B ports of the bucket cylinder. Example

[0036] A regeneration method, based on the above embodiment 2, comprises the following steps:

[0037] a. When the bucket swings outward, oil flows into the rod chamber of bucket cylinder 10.

[0038] Under the action of bucket gravity and rod chamber pressure of bucket cylinder 10, when the rod chamber pressure of bucket cylinder 10 is greater than the rod chamber pressure of bucket cylinder 10, the oil in the rod chamber of bucket cylinder 10 flows through regeneration stop valve 2 and one-way valve I5 to regeneration selection valve 7;

[0039] The regeneration control valve 8 moves to the left under the action of the current. The oil pressure at the A and B ports acts on the regeneration selector valve 7 through the regeneration control valve 8. The oil pressure in the rodless chamber of the bucket cylinder 10 is greater than the rod chamber pressure of the bucket cylinder 10. The regeneration selector valve 7 moves to the right under the action of the oil pressure in the rodless chamber of the bucket cylinder 10.

[0040] The rightward movement of the regeneration selection valve 7 causes the oil in the rodless chamber of the bucket cylinder 10 to flow through the regeneration selection valve 7 to the rod chamber of the bucket cylinder 10, thereby realizing flow regeneration.

[0041] b. When the bucket is retracted, the bucket cylinder 10 has no rod cavity and oil enters.

[0042] Under the action of the bucket gravity and the rodless cavity pressure of the bucket cylinder 10, when the rod cavity pressure of the bucket cylinder 10 is greater than the rodless cavity pressure of the bucket cylinder 10, the oil in the rod cavity of the bucket cylinder 10 flows through the one-way valve II 6 to the regeneration selection valve 7;

[0043] The regeneration control valve 8 moves left under the action of the current. The oil pressure at the A and B ports acts on the regeneration selector valve 7 through the regeneration control valve 8. The oil pressure in the rod chamber of the bucket cylinder 10 is greater than the pressure in the rodless chamber of the bucket cylinder 10. The regeneration selector valve 7 moves left under the action of the oil pressure in the rod chamber of the bucket cylinder 10.

[0044] The leftward movement of the regeneration selection valve 7 causes the oil in the rod chamber of the bucket cylinder 10 to flow through the regeneration selection valve 7 to the rodless chamber of the bucket cylinder 10, thereby realizing flow regeneration.

[0045] Flow regeneration under the two aforementioned operating conditions does not occur throughout the bucket cylinder's operation. It only occurs when the return chamber pressure exceeds the inlet chamber pressure. This means that flow regeneration occurs only when the bucket and load together constitute a negative load. When the bucket and load together constitute a load, the regeneration control valve is de-energized and reset, terminating flow regeneration. Flow regeneration is dependent on the bucket cylinder's bucket position or the pressure in the rod and rodless chambers. The regeneration control valve receives the bucket cylinder's displacement or pressure signal to activate and deactivate the electromagnet, enabling flow regeneration.

[0046] c. When the bucket is digging (no oil is flowing into the rod cavity of the bucket cylinder 10), the digging position of the bucket is determined by the external working conditions. The digging force required by the bucket when digging is determined by the digging material, soil and other factors. However, no matter how the bucket position and the digging material change, the speed of the bucket cylinder is low. At this time, the return oil pressure, that is, the rod cavity pressure, is connected to the return oil channel in the hydraulic system of the excavator, and the pressure is basically zero.

[0047] This invention solves the problem of flow regeneration during bucket retraction and outward swing. By providing a two-way regeneration valve, flow regeneration can be achieved not only during bucket outward swing but also during bucket retraction. High-pressure oil selection is achieved through a dual-check valve logic oil circuit, while the regeneration valve automatically identifies flow regeneration selection based on the pressure at ports A and B. The regeneration shut-off valve automatically opens and closes the regeneration valve under the pressure at ports A and B.

[0048] The oil circuit structure of the present invention is simple and compact, easy to process and operate, and fully utilizes the hydraulic system's own characteristics and the effect of external load during the hydraulic excavator bucket swinging outward and the bucket retracting inward, and uses the regeneration valve to realize the two-way regeneration function of the oil, thereby achieving the purpose of energy saving of the hydraulic excavator and improving the working efficiency.

[0049] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A two-way regeneration valve, Its characteristics are: It includes a regeneration stop valve (2), a regeneration selection valve (7) and a regeneration control valve (8); The A" oil port is connected to the rod chamber of the bucket cylinder (10), and the B" oil port is connected to the rodless chamber of the bucket cylinder (10); The oil outlet of the regeneration selection valve (7) is respectively connected to the A" oil port and the B" oil port, and the oil inlet of the regeneration selection valve (7) is respectively connected to a one-way valve I (5) and a one-way valve II (6); the one-way valve II (6) is connected to the A" oil port; the one-way valve I (5) is connected to the regeneration stop valve (2), and the regeneration stop valve (2) is connected to the B" oil port; The oil outlet of the regeneration control valve (8) is respectively connected to the two control ends of the regeneration selection valve (7), and the oil inlet of the regeneration control valve (8) is respectively connected to the A "oil port" and the B "oil port; The two control ends of the regeneration stop valve (2) are respectively connected to the A" oil port and the B" oil port.

2. The two-way regeneration valve according to claim 1, characterized in that: The regeneration stop valve (2) is a two-position, two-way valve; a throttle valve I (1) is installed in the oil circuit from the B" oil port to the regeneration control valve (8) and the left control end of the regeneration stop valve (2); and a throttle valve II (3) is installed in the oil circuit from the A" oil port to the right control end of the regeneration control valve (8).

3. The two-way regeneration valve according to claim 2, characterized in that: The regeneration control valve (8) is a two-position five-way solenoid valve, and the spring chamber and the oil return port of the regeneration control valve (8) are connected to the oil tank (9); a throttle valve III (4) is installed in the oil circuit from the A" oil port to the oil inlet of the regeneration control valve (8).

4. The two-way regeneration valve according to claim 3, characterized in that: The regeneration selection valve (7) is a three-position three-way valve.

5. A regeneration method, using any one of the two-way regeneration valves of claims 1 to 4, characterized in that: The steps include: a. When the bucket swings outward, oil flows into the rod chamber of the bucket cylinder (10). When the rodless cavity of the bucket oil cylinder (10) is under the action of the bucket gravity and the rod cavity pressure of the bucket oil cylinder (10), and the pressure of the rodless cavity of the bucket oil cylinder (10) is greater than the pressure of the rod cavity of the bucket oil cylinder (10), the oil in the rodless cavity of the bucket oil cylinder (10) flows through the regeneration stop valve (2) and the one-way valve I (5) to the regeneration selection valve (7); The regeneration control valve (8) moves to the left under the action of the current, and the oil pressure of the A "oil port" and the B "oil port acts on the regeneration selection valve (7) through the regeneration control valve (8). The oil pressure of the rodless chamber of the bucket cylinder (10) is greater than the rod chamber pressure of the bucket cylinder (10), and the regeneration selection valve (7) moves to the right under the action of the oil pressure of the rodless chamber of the bucket cylinder (10); The rightward movement of the regeneration selection valve (7) causes the oil in the rodless chamber of the bucket oil cylinder (10) to flow through the regeneration selection valve (7) to the rod chamber of the bucket oil cylinder (10), thereby realizing flow regeneration; b. When the bucket is retracted, the bucket cylinder (10) does not have a rod cavity and oil is fed into it. When the rod chamber pressure of the bucket oil cylinder (10) is greater than the rod chamber pressure of the bucket oil cylinder (10) under the action of the bucket gravity and the rodless chamber pressure of the bucket oil cylinder (10), the oil in the rod chamber of the bucket oil cylinder (10) flows through the one-way valve II (6) to the regeneration selection valve (7); The regeneration control valve (8) moves to the left under the action of the current, and the oil pressure of the A "oil port" and the B "oil port acts on the regeneration selection valve (7) through the regeneration control valve (8). The oil pressure in the rod chamber of the bucket cylinder (10) is greater than the pressure in the rodless chamber of the bucket cylinder (10). The regeneration selection valve (7) moves to the left under the action of the oil pressure in the rod chamber of the bucket cylinder (10); The leftward movement of the regeneration selection valve (7) causes the oil in the rod chamber of the bucket cylinder (10) to flow through the regeneration selection valve (7) to the rodless chamber of the bucket cylinder (10), thereby realizing flow regeneration.

6. A regeneration method according to claim 5, characterized in that: The regeneration control valve (8) realizes the on and off of the electromagnet by receiving the displacement signal or pressure signal of the bucket cylinder (10).

7. An excavator, employing the two-way regeneration valve according to any one of claims 1 to 4.

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