Multi-way valve for overhead working truck

Abstract

The utility model discloses a multi-way valve for an overhead working truck. The problem that an existing multi-way valve cannot achieve rapid unloading is solved. The valve comprises a valve body, an oil inlet unit, a working unit, an oil inlet, an oil return port and a working oil port, the reversing valve rod is arranged on the working link and slides relative to the valve body; the overflow valve is arranged on the oil inlet connector, and the oil inlet is connected with the oil return port through the overflow valve; the overflow valve is provided with a control cavity and a remote control port; the control valve is arranged on the oil inlet connector, the control cavity is connected with the control valve through a remote control port, and the control valve is provided with a first position where the remote control port is connected with the oil return port when the control valve is opened and a second position where the control valve is closed. The utility model has the beneficial effects that the remote control port of the overflow valve is connected with the control valve, and the opening pressure of the overflow valve can be controlled through the reversing of the control valve, so that the large-flow quick unloading is realized.

Description

Technical Field

[0001] The utility model relates to an open-center multi-way reversing valve, in particular to a multi-way valve for an aerial work vehicle. Background Art

[0002] Aerial work vehicles refer to special vehicles that transport workers and equipment to the site and perform aerial work. The development of truck-mounted crane vehicles with aerial work is getting faster and faster. It combines the functions of truck-mounted cranes and aerial work vehicles. It has a wide range of uses and is widely used in construction, cleaning, maintenance and decoration. Its flexibility and efficiency have brought convenience to our lives and provided safety for our aerial workers. At present, the hydraulic multi-way valves of truck-mounted crane vehicles with aerial work in China mainly rely on imports, with high costs and long delivery time, which reduces the market competitiveness of the existing system and greatly increases the manufacturing cost of the product. The existing multi-way valve usually includes a working joint and an oil inlet joint; the oil inlet joint is provided with a relief valve, which only serves as a safety valve. At present, the market and foreign countries basically directly set the solenoid valve to unload. Due to the limited structure of the solenoid valve and insufficient flow capacity, there is a disadvantage that the system pressure cannot be quickly unloaded in a short time. Utility Model Content

[0003] In order to solve the problem that the existing multi-way valve in the background technology cannot unload quickly, the utility model provides a multi-way valve for an aerial work vehicle.

[0004] The technical solution of the utility model is: a multi-way valve for aerial work vehicles, including a valve body, an oil inlet joint, a working joint, an oil inlet port and an oil return port, and also includes:

[0005] Working oil port, located on the working connection, used to connect with the working power element;

[0006] The reversing valve stem is arranged on the working link and is slidably arranged relative to the valve body, and is used to connect the working oil port with the oil inlet or with the oil return port;

[0007] The overflow valve is arranged on the oil inlet, and the oil inlet is connected to the oil return port through the overflow valve; the overflow valve is provided with a control chamber and a remote control port;

[0008] The control valve is arranged in the oil inlet connection. The control chamber is connected to the control valve through the remote control port. The control valve has a first position of opening so that the remote control port is connected to the oil return port and a second position of closing.

[0009] As a further improvement of the utility model, the overflow valve comprises:

[0010] The first valve core is used to separate the oil inlet and the oil return port;

[0011] The first elastic member is against the first valve core and has a movement tendency to drive the first valve core to close;

[0012] The first damping hole is arranged on the first valve core, and the oil inlet is connected with the control chamber through the first damping hole.

[0013] As a further improvement of the utility model, it also includes:

[0014] A relief valve block, wherein the first valve core is sleeved in the relief valve block;

[0015] The overflow valve seat is arranged in the overflow valve block and cooperates with the overflow valve block to form the control chamber;

[0016] The overflow valve sleeve is sleeved outside the overflow valve block and forms an oil discharge port, and the oil discharge port is connected to the oil return port.

[0017] As a further improvement of the utility model, it also includes:

[0018] A second valve core is used to separate the control chamber and the oil discharge port;

[0019] The second elastic member is against the second valve core and has a movement tendency of driving the second valve core to be closed; the elastic force of the second elastic member is greater than the elastic force of the first elastic member.

[0020] As a further improvement of the present invention, the end of the second valve core is configured in a conical shape.

[0021] As a further improvement of the utility model, it also includes a travel switch, which is arranged on the valve body and is used to detect whether the reversing valve stem is in place; the reversing valve stem is provided with a driving inclined surface for driving the travel switch, and the travel switch is connected to the control valve for switching the control valve position.

[0022] As a further improvement of the utility model, a rectangular groove and / or an eyebrow groove is provided on the reversing valve stem, and when the reversing valve stem is in the middle position, the oil inlet is connected to the oil return port.

[0023] As a further improvement of the utility model, the reversing valve stem is controlled manually, hydraulically and / or electrically proportionally.

[0024] As a further improvement of the utility model, there are four reversing valve stems, each of which is arranged corresponding to a working oil port and is used to control the telescopic, luffing, hoisting and rotating actions respectively.

[0025] As a further improvement of the utility model, the control valve is a two-position two-way electromagnetic reversing valve.

[0026] The utility model has the beneficial effect that the remote control port of the overflow valve is connected to the control valve, and the opening pressure of the overflow valve can be controlled by changing the direction of the control valve, thereby realizing large flow and fast unloading. The utility model also has the advantages of simple structure, convenient assembly, reliable action, long service life, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Attached Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0028] Attached Figure 2 It is a schematic diagram of the structure in another direction of an embodiment of the utility model.

[0029] Attached Figure 3 It is a schematic cross-sectional structure diagram of the overflow valve according to an embodiment of the utility model.

[0030] Attached Figure 4 The hydraulic principle diagram of the embodiment of the utility model.

[0031] Attached Figure 5 It is a structural schematic diagram of the reversing valve stem of an embodiment of the utility model.

[0032] In the figure, 1, valve body; 2, oil inlet joint; 3, working joint; 4, working oil port; 5, reversing valve stem; 51, driving inclined plane; 52, rectangular groove; 53, eyebrow groove; 6, relief valve; 61, control chamber; 62, remote control port; 63, first valve core; 631, first damping hole; 64, first elastic member; 65, relief valve block; 66, relief valve seat; 67, relief valve sleeve; 671, oil unloading port; 68, second valve core; 69, second elastic member; 7, control valve; 8, travel switch; P, oil inlet; T, oil return port. DETAILED DESCRIPTION

[0033] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0034] Depend on Figure 1 Combination Figure 2-5 As shown, a multi-way valve for aerial work vehicles includes a valve body 1, an oil inlet link 2, a working link 3, an oil inlet port P and an oil return port T, and also includes:

[0035] Working oil port 4, provided on working link 3 for connecting with working power element;

[0036] The reversing valve stem 5 is arranged on the working link 3 and is slidably arranged relative to the valve body 1, so as to make the working oil port 4 communicate with the oil inlet port P or the oil return port T;

[0037] The overflow valve 6 is provided on the oil inlet connection 2. The oil inlet P is connected to the oil return port T through the overflow valve 6. The overflow valve 6 is provided with a control chamber 61 and a remote control port 62.

[0038] The control valve 7 is arranged in the oil inlet connection 2. The control chamber 61 is connected to the control valve 7 through the remote control port 62. The control valve 7 has a first position in which the remote control port 62 is opened to connect to the oil return port T and a second position in which the control valve 7 is closed. The control valve 7 is a two-position two-way electromagnetic reversing valve.

[0039] The beneficial effect of the utility model is that the remote control port of the overflow valve is connected to the control valve, and the opening pressure of the overflow valve can be controlled by reversing the control valve, thereby realizing large flow and rapid unloading. The utility model also has the advantages of simple structure, convenient assembly, reliable operation, and long service life. Specifically, the multi-way valve is connected to the gear pump and is mainly used for precise control of telescopic, boom lengthening, hoisting, and rotation of the aerial work vehicle. When the oil is fed from the P port and the solenoid valve (control valve) is not energized, the gear pump is unloaded; when the solenoid valve is energized, the remote control overflow valve works, and the control handles (reversing valve stems) of each working joint are respectively manipulated to reverse, and the high-pressure oil passes through the throttling groove of the reversing valve stem (rectangular groove and / or eyebrow groove) and enters each control cylinder to push the cylinder to realize the various functions of the boom. When operating the multi-way valve handle to change direction, since the multi-way valve is equipped with a micro switch (travel switch), when the reversing valve stem changes to the extreme position, the micro switch will be triggered. At this time, the micro switch sends a safety signal to trigger the solenoid valve to cut off the power. The solenoid valve cooperates with the remote control relief valve to realize forced unloading, avoiding continuous high pressure in the system, saving energy and avoiding safety accidents.

[0040] The relief valve 6 comprises:

[0041] The first valve core 63 is used to separate the oil inlet P and the oil return port T;

[0042] The first elastic member 64 is against the first valve core 63 and has a movement tendency to drive the first valve core 63 to close;

[0043] The first damping hole 631 is provided on the first valve core 63 , and the oil inlet P is connected with the control chamber 61 through the first damping hole 631 .

[0044] A relief valve block 65, wherein the first valve core 63 is sleeved in the relief valve block 65;

[0045] The overflow valve seat 66 is disposed in the overflow valve block 65 and cooperates with the overflow valve block 65 to form the control chamber 61;

[0046] The relief valve sleeve 67 is sleeved outside the relief valve block 65 and forms an oil discharge port 671, and the oil discharge port 671 is connected to the oil return port T. The setting of the oil discharge port can make the hydraulic oil in the control chamber quickly reach the oil return port, so that the first valve core can be opened quickly and reliably, and the energy consumption is low. The utility model adopts a pilot structure to make the relief valve start and close smoothly and respond quickly. Through the coordination of the relief valve and the unloading valve, the defect of insufficient flow capacity due to the structure of the solenoid valve when unloading directly through the solenoid valve is avoided, and the disadvantage that the system pressure cannot be quickly unloaded in a short time is avoided.

[0047] The utility model also includes:

[0048] The second valve core 68 is used to separate the control chamber 61 and the oil discharge port 671;

[0049] The second elastic member 69 is against the second valve core 68, and has a movement tendency to drive the second valve core 68 to close; the elastic force of the second elastic member 69 is greater than the elastic force of the first elastic member 64. Specifically, the end of the second valve core 68 is set in a conical shape. Such a structure controls the cavity through the second valve core, and the second elastic member mainly acts as a safety valve. When the system pressure is greater than the elastic force of the second elastic member, the second valve core is opened to relieve the pressure in the control cavity. At this time, the pressure oil opens the first valve core to achieve rapid pressure reduction.

[0050] The utility model also includes a travel switch 8, which is arranged on the valve body 1 and is used to detect the position of the reversing valve stem 5; the reversing valve stem 5 is provided with a driving inclined surface 51 for driving the travel switch 8, and the travel switch 8 is connected to the control valve 7 for switching the position of the control valve 7. The travel switch can realize real-time position monitoring of the reversing valve stem, which is convenient for micro-control adjustment; the multi-way valve can be integrated with a position detection switch, which can cooperate with the force limit to provide safety protection for the system.

[0051] The reversing valve stem 5 is provided with a rectangular groove 52 and / or an eyebrow groove 53. When the reversing valve stem 5 is in the middle position, the oil inlet P is connected to the oil return port T. The throttle groove is perfectly matched with the working condition design, and the host control performance is greatly improved. At present, most of the switch valve structures on the market have poor micro-movement effects.

[0052] The reversing valve stem 5 is controlled manually, hydraulically and / or electrically proportionally. Such a structure makes the product control convenient and reliable. Specifically, there are four reversing valve stems 5, each of which is set corresponding to the working oil port, and is used to control the telescopic, luffing, hoisting and rotating actions respectively. Such a structure makes the reversing valve stem action convenient and reliable, and the structure is simple.

[0053] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0055] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of the utility model patent right.

Claims

1. A multi-way valve for aerial work vehicles, comprising a valve body (1), an oil inlet connection (2), a working connection (3), an oil inlet port (P) and an oil return port (T), characterized in that Also included: A working oil port (4) is provided on the working link (3) and is used for connecting to a working power element; A reversing valve stem (5) is disposed on the working joint (3) and is slidably arranged relative to the valve body (1) and is used to connect the working oil port (4) with the oil inlet port (P) or with the oil return port (T); The overflow valve (6) is arranged on the oil inlet joint (2), and the oil inlet (P) is connected to the oil return port (T) through the overflow valve (6); the overflow valve (6) is provided with a control chamber (61) and a remote control port (62); The control valve (7) is arranged in the oil inlet connection (2); the control chamber (61) is connected to the control valve (7) via the remote control port (62); the control valve (7) has a first position in which the remote control port (62) is opened and connected to the oil return port (T); and a second position in which the control valve (7) is closed.

2. A multi-way valve for aerial work vehicles according to claim 1, characterized in that The overflow valve (6) comprises: A first valve core (63) is used to separate the oil inlet (P) and the oil return port (T); The first elastic member (64) is against the first valve core (63) and has a movement tendency to drive the first valve core (63) toward closing; The first damping hole (631) is provided on the first valve core (63), and the oil inlet (P) is connected to the control chamber (61) through the first damping hole (631).

3. A multi-way valve for aerial work vehicles according to claim 2, characterized in that Also includes: A relief valve block (65), wherein the first valve core (63) is sleeved in the relief valve block (65); A relief valve seat (66) is disposed in the relief valve block (65) and cooperates with the relief valve block (65) to form the control chamber (61); The relief valve sleeve (67) is sleeved outside the relief valve block (65) and forms an oil discharge port (671). The oil discharge port (671) is connected to the oil return port (T).

4. A multi-way valve for aerial work vehicles according to claim 3, characterized in that Also includes: A second valve core (68) for separating the control chamber (61) and the oil discharge port (671); The second elastic member (69) is opposed to the second valve core (68) and has a movement tendency to drive the second valve core (68) to close; the elastic force of the second elastic member (69) is greater than the elastic force of the first elastic member (64).

5. A multi-way valve for aerial work vehicles according to claim 4, characterized in that The end of the second valve core (68) is arranged in a conical shape.

6. The multi-way valve for aerial work vehicle according to claim 1, characterized in that It also includes a travel switch (8) disposed on the valve body (1) and used for detecting whether the reversing valve stem (5) is in position; the reversing valve stem (5) is provided with a driving inclined surface (51) for driving the travel switch (8); the travel switch (8) is connected to the control valve (7) and is used for switching the position of the control valve (7).

7. The multi-way valve for aerial work vehicle according to claim 1, characterized in that The reversing valve stem (5) is provided with a rectangular groove (52) and / or an eyebrow groove (53). When the reversing valve stem (5) is in a neutral position, the oil inlet (P) is connected to the oil return port (T).

8. The multi-way valve for aerial work vehicle according to claim 1, characterized in that The reversing valve stem (5) is controlled manually, hydraulically and / or electrically proportionally.

9. The multi-way valve for aerial work vehicle according to claim 1, characterized in that There are four reversing valve stems (5), each of which is provided corresponding to a working oil port and is used to control the telescopic, luffing, hoisting and rotating actions respectively.

10. The multi-way valve for aerial work vehicle according to claim 1, characterized in that The control valve (7) is a two-position two-way electromagnetic reversing valve.

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