A hydraulic circuit for controlling the lifting of a working bucket

Abstract

The utility model relates to a kind of hydraulic circuit for controlling work bucket lifting, belong to aerial work platform field.The utility model includes hydraulic cylinder, hydraulic control check valve, check valve and direction control valve, its structural features are at:The hydraulic control check valve includes first check valve and control port, the first check valve is connected with control port, the rodless cavity of the hydraulic cylinder is connected with first check valve, the rod cavity of the hydraulic cylinder is connected with control port, the control port is connected with check valve, the first check valve and check valve are connected with the A port and B port of direction control valve respectively;The check valve includes second check valve and third check valve, the third check valve is connected between control port and the B port of direction control valve, the second check valve is connected with third check valve.

Description

Technical Field

[0001] This utility model relates to a hydraulic circuit for controlling the lifting and lowering of the work bucket, belonging to the field of aerial work platforms. Background Technology

[0002] Currently, the boom and work platform vehicles on the market are quite tall. In order to meet the requirement that the work bucket can pick up and drop off personnel from the ground, the negative angle of the boom and work bucket is often designed to be relatively large. When the work bucket is being drained, the old design is prone to causing the hydraulic cylinder of the work bucket to slowly slide out under the weight of the work bucket. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings in the existing technology and to provide a hydraulic circuit with a reasonable structural design for controlling the lifting and lowering of the working bucket.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows: the hydraulic circuit for controlling the lifting and lowering of the working bucket includes a hydraulic cylinder, a hydraulically controlled check valve, a one-way damping valve, and a directional control valve. Its structural features are as follows: the hydraulically controlled check valve includes a first check valve and a control port. The first check valve is connected to the control port. The rodless chamber of the hydraulic cylinder is connected to the first check valve. The rod chamber of the hydraulic cylinder is connected to the control port. The control port is connected to the one-way damping valve. The first check valve and the one-way damping valve are respectively connected to port A and port B of the directional control valve.

[0005] Furthermore, the one-way damping valve includes a second one-way valve and a third one-way valve. The third one-way valve is connected in series between the control port and port B of the directional control valve, while the second and third one-way valves are connected in parallel. The third one-way valve is connected to the rod chamber of the hydraulic cylinder, which adds an initial resistance to the rod chamber, preventing the hydraulic oil in the rod chamber from rapidly escaping.

[0006] Furthermore, the directional control valve can be controlled manually, electromagnetically, or hydraulically.

[0007] Furthermore, the hydraulically controlled check valve is a one-way balance valve.

[0008] Furthermore, the neutral position function of the directional control valve is Y-type, O-type, or J-type.

[0009] Furthermore, the one-way damping valve is a one-way sequence valve.

[0010] Furthermore, the first check valve is connected to a throttle orifice, and the throttle orifice is connected to port A of the directional control valve.

[0011] Furthermore, the valve core of the directional control valve is provided with a throttling groove.

[0012] Compared with the prior art, this utility model has the following advantages: When the working bucket is in normal working condition, the piston rod of the hydraulic cylinder is compressed, and the hydraulic control check valve can lock the piston rod of the hydraulic cylinder at any position within the stroke range; when the working bucket is in the water discharge state, the piston rod of the hydraulic cylinder is stretched, and the hydraulic oil in the rod chamber of the hydraulic cylinder is locked by the third check valve, thereby preventing the piston rod of the hydraulic cylinder from escaping. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the hydraulic principle of the hydraulic circuit for controlling the lifting and lowering of the work bucket according to an embodiment of this utility model.

[0014] Figure 2 This is a schematic diagram of the force analysis of the hydraulic cylinder according to an embodiment of the present invention.

[0015] In the diagram: 1. Hydraulic cylinder; 2. Hydraulic check valve; 3. One-way damping valve; 4. Directional control valve; 5. Throttling orifice; 6. Weight. First check valve 21, control port 22 Second check valve 31, third check valve 32. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0017] Example

[0018] See Figures 1 to 2 As shown in the accompanying drawings, the structures, proportions, sizes, etc., depicted in this specification are merely for illustrative purposes to aid those skilled in the art and to provide a clear understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the use of terms such as "upper," "lower," "left," "right," "middle," and "one" in this specification is solely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0019] The hydraulic circuit for controlling the lifting and lowering of the work bucket in this embodiment includes a hydraulic cylinder 1, a hydraulically controlled check valve 2, a one-way damping valve 3, and a directional control valve 4. The hydraulically controlled check valve 2 includes a first check valve 21 and a control port 22. The first check valve 21 is connected to the control port 22, and the pressure at the control port 22 determines the opening and closing of the check valve 21. The one-way damping valve 3 includes a second check valve 31 and a third check valve 32.

[0020] In this embodiment, the rodless chamber of the hydraulic cylinder 1 is connected to the first check valve 21, the rod chamber of the hydraulic cylinder 1 is connected to the control port 22, the control port 22 is connected to the one-way damping valve 3, and the first check valve 21 and the one-way damping valve 3 are respectively connected to the A port and the B port of the directional control valve 4.

[0021] Specifically, the third check valve 32 is connected in series between the control port 22 and the B port of the directional control valve 4, and the second check valve 31 is connected in parallel with the third check valve 32.

[0022] It is also possible. The first one-way valve 21 is connected to the throttle orifice 5, and the throttle orifice 5 is connected to port A of the directional control valve 4. Changing the diameter of the throttle orifice 5 can adjust the speed of extension and retraction of the hydraulic cylinder 1.

[0023] In this embodiment, the directional control valve 4 is controlled manually, electromagnetically, or hydraulically. The neutral position function of the directional control valve 4 is Y-type, O-type, or J-type. The valve core of the directional control valve 4 is provided with a throttling groove. The hydraulic control check valve 2 is a one-way balance valve, and the one-way damping valve 3 is a one-way sequence valve.

[0024] Specifically, when the directional control valve 4 is switched to the left, hydraulic oil enters the rodless chamber of the hydraulic cylinder 1 from port A through the throttle orifice 5 and the first check valve 21. The hydraulic oil in the rod chamber of the hydraulic cylinder 1 flows out from the third check valve 32 and enters port B of the directional control valve 4. When the directional control valve 4 is switched to the right, hydraulic oil enters the rod chamber of the hydraulic cylinder 1 from port B through the second check valve 31. The control port 22 in the rod chamber opens the first check valve 21, and the hydraulic oil in the rodless chamber of the hydraulic cylinder 1 flows out from the first check valve 21 and the throttle orifice 5 and enters port A of the directional control valve 4.

[0025] When the working bucket is in normal working condition, that is, the direction of gravity of the weight 6 is in the N direction, the piston rod of the hydraulic cylinder 1 is under pressure, and the hydraulic control check valve 2 can lock the piston rod of the hydraulic cylinder 1 at any position within the stroke range.

[0026] When the working bucket is in the pouring state, that is, the direction of gravity of the weight 6 is M, the piston rod of the hydraulic cylinder 1 is under tension, and the hydraulic oil in the rod chamber of the hydraulic cylinder 1 is locked by the third check valve 32, thereby preventing the piston rod of the hydraulic cylinder 1 from escaping.

[0027] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model are included within the protection scope of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined by the claims, all of which should fall within the protection scope of this utility model.

Claims

1. A hydraulic circuit for controlling the lifting of a working bucket, comprising a hydraulic cylinder (1), a hydraulic control non-return valve (2), a non-return damping valve (3) and a directional control valve (4), characterised in that: The hydraulic control check valve (2) includes a first check valve (21) and a control port (22). The first check valve (21) is connected to the control port (22). The one-way damping valve (3) includes a second check valve (31) and a third check valve (32). The second check valve (31) and the third check valve (32) are connected in parallel. The rodless chamber of the hydraulic cylinder (1) is connected to the first check valve (21). The first check valve (21) is connected to port A of the directional control valve (4). The rod chamber of the hydraulic cylinder (1) is connected to the control port (22). The control port (22) is connected to the third check valve (32). The third check valve (32) is connected to port B of the directional control valve (4).

2. The hydraulic circuit for controlling the lifting of a work bucket according to claim 1, characterized by: The directional control valve (4) can be controlled manually, electromagnetically, or hydraulically.

3. The hydraulic circuit for controlling the lifting of a work bucket according to claim 1, characterized by: The hydraulic control check valve (2) is a one-way balance valve.

4. The hydraulic circuit for controlling the lifting of a work bucket according to claim 1, characterized by: The neutral position function of the directional control valve (4) is Y-type, O-type or J-type.

5. The hydraulic circuit for controlling the lifting of a work bucket according to claim 1, characterized by: The one-way damping valve (3) is a one-way sequence valve.

6. The hydraulic circuit for controlling the lifting of a work bucket according to claim 1, characterized by: The first one-way valve (21) is connected to the throttle orifice (5), and the throttle orifice (5) is connected to port A of the directional control valve (4).

7. The hydraulic circuit for controlling the lifting of a work bucket according to claim 1, characterized by: The directional control valve (4) has a throttling groove on its valve core.

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