阅读说明：本技术 一种多功能液压提升器总成 (Multifunctional hydraulic lifter assembly ) 是由 柳秋杰 姜洪兴 刘建波 李松燕 王兆华 于 2019-09-04 设计创作，主要内容包括：本发明公开一种多功能液压提升器总成,包括力位控制分配器,与现有技术不同的是：还包括一个手柄控制的三位五通辅助强压阀,所述三位分别为中立位、强降位、浮动位,其中P入口连接液压泵液压油出口、B口连接双作用油缸的右缸、P出口通过所述力位控制分配器连接所述双作用油缸的左腔；当处于浮动位时,P<Sub>入</Sub>口和P<Sub>出</Sub>口导通、P口封闭、B口与T口导通而卸荷；当处于强降位时,P口与B口导通,其它口封闭；当处于中立位时,P<Sub>入</Sub>口和P<Sub>出</Sub>口导通,其它口封闭。本发明集成了以上两种提升器的优点,克服了其缺点,农具下降既能靠自重下降,也可根据需要使用强降功能,即使在较硬的土层,也可使农具到达预定的位置。(The invention discloses a multifunctional hydraulic lifter assembly, which comprises a force position control distributor, and is different from the prior art in that: the hydraulic pump also comprises a three-position five-way auxiliary strong pressure valve controlled by a handle, wherein the three positions are a neutral position, a strong reduction position and a floating position respectively, a P inlet is connected with a hydraulic oil outlet of the hydraulic pump, a B port is connected with a right cylinder of the double-acting oil cylinder, and a P outlet is connected with a left cavity of the double-acting oil cylinder through the force position control distributor; when in a floating position, P Into Mouth and P Go out The port is communicated, the port P is closed, and the port B is communicated with the port T for unloading; when the device is in a strong descending position, the port P is communicated with the port B, and other ports are closed; when in neutral position, P Into Mouth and P Go out The ports are open and the other ports are closed. The invention integrates the advantages of the two lifters and overcomes the defects of the two lifters, the farm tool can descend by self weight, and the strong descending function can be used according to the requirement, so that the farm tool can reach the preset position even in a hard soil layer.)

1. A multi-functional hydraulic lifter assembly, including force position control distributor (1), characterized in that: the hydraulic control system also comprises a three-position five-way auxiliary strong pressure valve (2) controlled by a handle, wherein the three positions are a neutral position, a strong pressure reduction position and a floating position respectively, a P inlet is connected with a hydraulic oil outlet of a hydraulic pump, a B port is connected with a right cavity of a double-acting oil cylinder (3), and a P outlet is connected with a left cavity of the double-acting oil cylinder through the force position control distributor (1); when in a floating position, P_IntoMouth and P_{Go out}The port is communicated, the port P is closed, and the port B is communicated with the port T for unloading; when the device is in a strong descending position, the port P is communicated with the port B, and other ports are closed; when in neutral position, P_Intomouth and P_{Go out}The ports are open and the other ports are closed.

2. The multi-functional hydraulic lifter assembly of claim 1, wherein: the force position control distributor (1) comprises a three-position four-way main control valve (11), a hydraulic control oil return valve (12), a descending valve (13) and a one-way valve (14), wherein the three positions of the main control valve (11) are a neutral position, a lifting position and a descending position respectively; the hydraulic control oil return valve (13) is controlled by the hydraulic pressure of a T port of the main control valve (11);

When the auxiliary strong pressure valve (2) is in a floating position and the main control valve (11) is in a neutral position, a port P and a port T of the hydraulic control oil return valve (12) are communicated and unloaded, ports of the descending valve (13) are sealed, and the check valve (14) prevents hydraulic oil in a left cavity of the double-acting oil cylinder (3) from flowing back;

When the auxiliary strong pressure valve (2) is in a floating position and the main control valve (11) is in a lifting position, the ports of the hydraulic control oil return valve (12) and the drop valve (13) are closed, the one-way valve (14) is opened, and hydraulic oil enters a left cavity of the double-acting oil cylinder (3);

When the auxiliary strong pressure valve (2) is in a floating position and the main control valve (11) is in a descending position, P ports and T ports of the hydraulic control oil return valve (12) and the descending valve (13) are communicated to unload, and hydraulic oil flows out of a left cavity of the double-acting oil cylinder (3).

3. The multi-functional hydraulic lifter assembly of claim 1, wherein: further comprises a connecting auxiliary strong pressure valve (2) P_IntoA balancing valve (18) between port and port P.

4. The multi-functional hydraulic lifter assembly of claim 2, wherein: the main control valve (11) is a throttling main control valve.

5. A multi-functional hydraulic lifter assembly according to claim 1 or 2, wherein: the hydraulic control system is characterized by further comprising a system safety valve (19) connected to an oil way at the inlet end of the auxiliary strong pressure valve (2) and an oil cylinder safety valve (15) installed on an oil way at the outlet end of the force and position control distributor (1).

6. The multi-functional hydraulic lifter assembly of claim 2, wherein: the device also comprises an adjustable throttle valve (16) arranged on an oil circuit at the A port end of the descending valve (13).

7. The multi-functional hydraulic lifter assembly of claim 2, wherein: the hydraulic control oil return valve is characterized by further comprising a flow control valve (17) connected with the hydraulic control oil return valve (12) in parallel, wherein the flow control valve (17) is controlled by P on the left side of the main control valve (11)_{go out}The pressure of the port is controlled, and the pressure of the right side is controlled by the front end of the one-way valve (14).

8. A multi-functional hydraulic riser assembly as set forth in claim 3 wherein: the balance valve (18) is formed by combining a shunt oil way and a check valve.

Technical Field

The invention relates to agricultural machinery, in particular to a multifunctional hydraulic lifter assembly.

Background

An important component of a hydraulic lifter tractor. The function of the lifting device is to lift the farm tool and change the relative height of the farm tool and the tractor so as to control the working position and working depth of the farm tool.

the hydraulic lifter equipped for the current large and medium horsepower tractors in China can be divided into a force position control lifter and a strong lifting and strong lowering lifter according to different structures and functions.

The force position control lifter is provided with a single-action hydraulic oil cylinder, only can lift the farm tool, and cannot force the farm tool to enter the soil, the farm tool descends to enter the soil by the dead weight, and the main defect is that the farm tool cannot reach the preset depth only by the dead weight if the farm tool meets soil hardening or frozen soil layers.

The strong lifting and strong lowering lifter is provided with a double-acting hydraulic oil cylinder. The double-acting oil cylinder is composed of a piston, and has the advantages of strong lowering function, and the depth of the farm tool can be preset even if the farm tool encounters a soil hardened or frozen soil layer. The device has the defect that the farm tool cannot automatically generate lifting along with encountered working conditions without a force position control function. Under the condition of large soil resistance, the tractor component is damaged because the farm tool cannot be automatically lifted to reduce the resistance.

Disclosure of Invention

The invention aims to integrate the advantages of the two existing lifters, overcome the defects of the two existing lifters and provide a multifunctional hydraulic lifter assembly.

The invention realizes the aim through the following technical scheme:

A multi-functional hydraulic lifter assembly including a force position control distributor, unlike the prior art: the hydraulic pump also comprises a three-position five-way auxiliary strong pressure valve controlled by a handle, wherein the three positions are a neutral position, a strong reduction position and a floating position respectively, a P inlet is connected with a hydraulic oil outlet of the hydraulic pump, a B port is connected with a right cylinder of the double-acting oil cylinder, and a P outlet is connected with a left cavity of the double-acting oil cylinder through the force position control distributor; when in a floating position, P_IntoMouth and P_{Go out}The port is communicated, the port P is closed, and the port B is communicated with the port T for unloading; when in strong descending position, the P port is communicated with the B port, whichThe opening of the device is closed; when in neutral position, P_IntoMouth and P_{Go out}The ports are open and the other ports are closed.

Furthermore, the force and position control distributor comprises a three-position four-way main control valve, a hydraulic control oil return valve, a descending valve and a one-way valve, wherein three positions of the main control valve are a neutral position, a lifting position and a descending position respectively; the hydraulic control oil return valve is controlled by the hydraulic pressure of the T port of the main control valve;

When the auxiliary strong pressure valve is in a floating position and the main control valve is in a neutral position, a P port and a T port of the hydraulic control oil return valve are communicated to unload, each port of the descending valve is sealed, and the one-way valve prevents hydraulic oil in a left cavity of the double-acting oil cylinder from flowing back;

When the auxiliary strong pressure valve is in a floating position and the main control valve is in a lifting position, the ports of the hydraulic control oil return valve and the descending valve are closed, the one-way valve is opened, and hydraulic oil enters a left cavity of the double-acting oil cylinder;

When the auxiliary strong pressure valve is in a floating position and the main control valve is in a descending position, P ports of the hydraulic control oil return valve and the descending valve are communicated with the T port to unload, and hydraulic oil flows out of a left cavity of the double-acting oil cylinder.

Further, the device also comprises an auxiliary strong pressure valve P connected with the device_intoA balanced valve between port and port P.

Further, the main control valve is a throttling type main control valve.

The system comprises an auxiliary strong pressure valve, a system safety valve and an oil cylinder safety valve, wherein the auxiliary strong pressure valve is arranged on an oil path at the inlet end of the auxiliary strong pressure valve, and the oil cylinder safety valve is arranged on an oil path at the outlet end of the force position control distributor.

Further, the device also comprises an adjustable throttle valve arranged on an oil path at the opening end of the descending valve A.

Furthermore, the hydraulic control oil return valve also comprises a flow control valve connected with the hydraulic control oil return valve in parallel, and the left side of the flow control valve is controlled by P_{Go out}The pressure of the port is controlled, and the pressure of the right side of the valve is controlled by the pressure of the front end of the one-way valve.

Furthermore, the balance valve is formed by combining a shunt oil way and a check valve.

Compared with the prior art, the invention integrates the advantages of two lifters in the prior art and overcomes the defects of the two lifters. The agricultural implement can descend by the dead weight, can also use the strong descending function as required, and can reach the preset position even in a harder soil layer.

Drawings

Fig. 1 to 5 are schematic structural views of this embodiment 1.

FIG. 6 is a schematic structural view of embodiment 2.

Detailed Description