A multi-way valve for a conveyor dump truck

Abstract

The application discloses a multi-way valve for a delivery type self-unloading vehicle and relates to the technical field of multi-oil-way hydraulic control valves.The multi-way valve comprises an oil inlet joint, a tail joint, three reversing joints which are arranged in parallel between the oil inlet joint and the tail joint, a total oil inlet, an oil return port, a first single oil return port, a second single oil return port and a load feedback oil port; the oil inlet joint comprises a differential pressure valve, a flow valve and an LS overflow valve; the reversing joint comprises a reversing valve, a pressure compensation valve and a check valve; and the tail joint comprises a first pressure reducing valve, a second pressure reducing valve, an overflow valve and a tension electromagnetic valve. The multi-way valve can meet the working condition requirements of the self-unloading vehicle, has a small volume, a compact structure and can precisely control the speed.

Description

Technical Field

[0001] This invention relates to the field of multi-channel hydraulic control valve technology, and in particular to a multi-channel valve for a conveyor-type dump truck. Background Technology

[0002] Currently, due to the risk of tipping overturned dump trucks, a number of conveyor-type dump trucks have emerged in the market to avoid such situations. This type of dump truck can achieve automatic unloading with high efficiency and precision while ensuring safety. To meet the hydraulic system requirements of conveyor-type dump trucks, a multi-way valve has been developed to fill the gap in the application of multi-way valves in the hydraulic system of dump trucks, giving conveyor-type dump trucks a greater market advantage after using this multi-way valve. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-way valve for conveyor dump trucks to solve the problems existing in the prior art, meet the working requirements of dump trucks, and has a small size, compact structure, and precise speed control.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a multi-way valve for a conveyor-type dump truck, including an oil inlet connection and a tail connection, as well as three reversing connections arranged in parallel between the oil inlet connection and the tail connection, and also includes a main oil inlet, an oil return port, a first separate oil return port, a second separate oil return port, and a load feedback oil port.

[0006] The oil inlet valve includes a differential pressure valve, a flow valve, and an LS relief valve;

[0007] The reversing linkage includes a reversing valve, a pressure compensation valve, and a check valve;

[0008] The tail assembly includes a first pressure reducing valve, a second pressure reducing valve, an overflow valve, and a tensioning solenoid valve;

[0009] The oil inlet of the differential pressure valve is connected to the main oil inlet, the oil outlet of the differential pressure valve is connected to the return oil port, the spring chamber of the differential pressure valve, the oil inlet of the flow valve and the oil inlet of the LS relief valve are connected to the load feedback oil port; the oil outlets of the flow valve and the LS relief valve are connected to the return oil port and the first separate return oil port.

[0010] The inlet of the directional control valve is connected to the main inlet, the outlet of the directional control valve is connected to the inlet of the pressure compensation valve, the outlet of the pressure compensation valve is connected to the inlet of the check valve, the outlet of the check valve is connected to the working inlet of the directional control valve, the working outlet of the directional control valve is connected to the return port, and the two load ports of the directional control valve are respectively used to connect to the two ports of the hydraulic cylinder; the sensing outlet of the pressure compensation valve is connected to the load feedback port.

[0011] The inlets of the first and second pressure-reducing valves are connected to the main inlet. The outlet of the first pressure-reducing valve is connected to the inlets of six pilot solenoid valves. Each directional valve is connected to two pilot solenoid valves and controls the valve stem to switch directions through the two pilot solenoid valves to control the extension and retraction of the cylinder. The outlet of the second pressure-reducing valve is connected to the inlet of the tensioning solenoid valve and the relief valve. The tensioning solenoid valve is used to connect to the tensioning cylinder to control the opening and closing of the tensioning. The spring chambers of the first and second pressure-reducing valves and the outlet of the relief valve are connected to the second separate return port.

[0012] Preferably, in one, two, or three of the reversing couplings, the two load ports of the reversing valve are respectively connected to the inlet ports of two overload valves, and the outlet port of the overload valve is connected to the return port.

[0013] The present invention achieves the following technical effects compared to the prior art:

[0014] This invention provides a multi-way valve for a conveyor-type dump truck. The inlet valve, reversing valve, and tail valve are tightly connected, resulting in a small size and compact structure. The inlet valve is equipped with a differential pressure valve to ensure that the differential pressure is unaffected by the load, thus guaranteeing that the flow rate is proportionally controlled according to the valve stem opening size. An LS relief valve is also installed in the inlet valve to ensure that the pressure of the entire system does not exceed the limit. A flow valve is also installed in the inlet valve; when not in operation in the neutral position, the oil in the LS valve flows back to the oil tank, thereby relieving the LS pressure. By incorporating three reversing valves, each equipped with different valve stems as required, remote control is possible. The pilot solenoid valve is opened and closed to drive the valve stem to change direction, thereby precisely controlling the fluid flow and controlling the smoothness and speed of each action. The tail is equipped with a double pressure reducing valve, one to supply oil to the pilot solenoid valve and the other to supply oil to the tensioning device. To ensure pressure stability, a separate return oil circuit is also set up, which is not connected to the main circuit. An overflow valve is also set at the supply point of the tensioning cylinder to protect the tensioning cylinder from damage caused by pressure shock. A tensioning solenoid valve is also set up to independently control the operation of the tensioning cylinder. It is closed during unloading to protect the chain and opened during the return of the plate to ensure smooth return of the plate.

[0015] Furthermore, by installing an overload valve in the reversing coupling, when the load pressure is too high, the overflow from the overload valve protects the cylinder or motor from damage. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the hydraulic principle of the multi-way valve for a conveyor-type dump truck provided by the present invention;

[0018] Figure 2 A schematic diagram of the valve body structure of the multi-way valve for a conveyor-type dump truck provided by the present invention.

[0019] In the diagram: 100-Inlet valve, 200-Reversing valve, 300-Tail valve, 1-Differential pressure valve, 2-Flow valve, 3-LS relief valve, 4-Reversing valve, 5-Pressure compensation valve, 6-Check valve, 7-First pressure reducing valve, 8-Second pressure reducing valve, 9-Relief valve, 10-Tension solenoid valve, 11-Overload valve, 12-First pilot solenoid valve, 13-Second pilot solenoid valve, 14-Third pilot solenoid valve, 15-Fourth pilot solenoid valve, 16-Fifth pilot solenoid valve, 17-Sixth pilot solenoid valve, 18-First cylinder, 19-Second cylinder, 20-Third cylinder. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a multi-way valve for conveyor dump trucks to solve the problems existing in the prior art, meet the working conditions of dump trucks, and has a small size, compact structure, and precise speed control.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1-2As shown, this embodiment provides a multi-way valve for a conveyor-type dump truck, including an oil inlet 100 and a tail 300, as well as three reversing ducts 200 arranged in parallel between the oil inlet 100 and the tail 300. It also includes a main oil inlet P1, an oil return port T1, a first separate oil return port TS, a second separate oil return port TA, and a load feedback oil port LS1.

[0024] The oil inlet valve 100 includes a differential pressure valve 1, a flow valve 2, and an LS relief valve 3;

[0025] The reversing coupling 200 includes a reversing valve 4, a pressure compensation valve 5, and a check valve 6;

[0026] Tail connector 300 includes a first pressure reducing valve 7, a second pressure reducing valve 8, an overflow valve 9, and a tensioning solenoid valve 10;

[0027] The oil inlet of differential pressure valve 1 is connected to the main oil inlet P1, the oil outlet of differential pressure valve 1 is connected to the return oil port T1, the spring chamber of differential pressure valve 1, the oil inlet of flow valve 2 and the oil inlet of LS relief valve 3 are connected to the load feedback oil port LS1; the oil outlets of flow valve 2 and LS relief valve 3 are connected to the return oil port T1 and the first separate return oil port TS.

[0028] The inlet of the directional valve 4 is connected to the main inlet P1, the outlet of the directional valve 4 is connected to the inlet of the pressure compensation valve 5, the outlet of the pressure compensation valve 5 is connected to the inlet of the check valve 6, the outlet of the check valve 6 is connected to the working inlet of the directional valve 4, the working outlet of the directional valve 4 is connected to the return port T1, and the two load ports of the directional valve 4 are respectively used to connect to the two ports of the hydraulic cylinder; the sensing outlet of the pressure compensation valve 5 is connected to the load feedback port LS1.

[0029] The inlets of the first pressure reducing valve 7 and the second pressure reducing valve 8 are connected to the main oil inlet P1. The outlet of the first pressure reducing valve 7 is connected to the inlets of six pilot solenoid valves. Each directional valve 4 is connected to two pilot solenoid valves and controls the valve stem to switch directions through the two pilot solenoid valves to control the extension and retraction of the oil cylinder. The outlet of the second pressure reducing valve 8 is connected to the inlets of the tensioning solenoid valve 10 and the relief valve 9. The tensioning solenoid valve 10 is used to connect to the tensioning oil cylinder to control the opening and closing of the tensioning. The spring chambers of the first pressure reducing valve 7 and the second pressure reducing valve 8, as well as the outlet of the relief valve 9, are connected to the second separate return port TA.

[0030] In this embodiment, in the second reversing coupling 200 and the third reversing coupling 200, the two load ports of the reversing valve 4 are respectively connected to the inlet ports of the two overload valves 11, and the outlet port of the overload valve 11 is connected to the return port T1.

[0031] The principle is as follows: Oil flows into the multi-way valve inlet 100 from the pump port. The differential pressure valve 1 ensures the differential pressure, and the LS overflow valve 3 ensures that the maximum working pressure is not overloaded. The oil then enters the reversing coupling 200. The reversing coupling 200 has three channels, corresponding to the three actions of the dump truck: ① unloading and returning the platform, ② opening and closing the front cover, and ③ opening and closing the rear cover. The principle behind action ① unloading and plate return: The oil source, depressurized by the first pressure reducing valve 7, is supplied to the first pilot solenoid valve 12 to open. The valve stem of the reversing valve 4 in the first reversing coupling 200 is reversed. After the pressure compensation valve 5 is opened, the check valve 6 is pushed open, and the oil flows to the first oil cylinder 18. Then it returns to the oil tank to complete one unloading action. The oil source, depressurized by the first pressure reducing valve 7, is supplied to the second pilot solenoid valve 13 to open. The valve stem of the reversing valve 4 in the first reversing coupling 200 is reversed in the other direction. After the pressure compensation valve 5 is opened, the check valve 6 is pushed open, and the oil flows to the first oil cylinder 18. Then it returns to the oil tank to complete the plate return action. Action ② Front cover opening and closing principle: The oil source pressure reduced by the first pressure reducing valve 7 supplies the third pilot solenoid valve 14 to open. The valve stem of the reversing valve 4 in the second reversing coupling 200 reverses, and after the pressure compensation valve 5 opens, it pushes the check valve 6 to open, flowing to the second oil cylinder 19. The cylinder is protected by the load valve 11, and then returns to the oil tank to complete the front cover opening action; The oil source pressure reduced by the first pressure reducing valve 7 supplies the fourth pilot solenoid valve 15 to open. The valve stem of the reversing valve 4 in the second reversing coupling 200 reverses in the other direction. After the pressure compensation valve 5 opens, it pushes the check valve 6 to open, flowing to the second oil cylinder 19. The cylinder is protected by the load valve 11, and then returns to the oil tank to complete the front cover closing action. The principle behind the opening and closing of the rear cover (action ③): The oil pressure reduced by the first pressure reducing valve 7 is supplied to the fifth pilot solenoid valve 16 to open. The valve stem in the third reversing coupling 200 is reversed, and the oil flows through the pressure compensation valve 5 to open, pushing the check valve 6 to open. The oil flows to the third cylinder 20, and is protected by the load valve 11. Then it returns to the oil tank to complete the opening of the rear cover. The oil pressure reduced by the first pressure reducing valve 7 is supplied to the sixth pilot solenoid valve 17 to open. The valve stem in the third reversing coupling 200 is reversed in the other direction. The oil flows through the pressure compensation valve 5 to open, pushing the check valve 6 to open. The oil flows to the third cylinder 20, and is protected by the load valve 11. Then it returns to the oil tank to complete the closing of the rear cover. The tail coupling corresponds to the fourth action of the dump truck, ④ the opening and closing of the tensioning device. The principle behind the opening and closing of the tensioning device is: The pressure-reducing oil from the second pressure reducing valve 8 is supplied to the tensioning device, bypassing the overflow valve 9 to protect the tensioning cylinder. Then it is connected to the switch tensioning solenoid valve 10 to control the opening and closing of the tensioning device. The above four actions can be remotely controlled independently without interference. The first three actions can achieve linear proportional speed output by selecting different valve stems, meeting any customer's speed requirements. The tensioning cylinder and the inlet oil pressure reducing valve are both integrated into the tail assembly, saving cost and space while meeting user functional requirements.

[0032] In this invention, the inlet oil is pressure-reduced by a tail-connected pressure-reducing valve before being supplied to each pilot solenoid valve and tensioning solenoid valve, eliminating the need for a temporary oil source valve and the associated cost. This invention employs electric remote control, allowing for remote control of the pilot and tensioning solenoid valves. Different valve stems can be selected according to flow requirements, satisfying customers' needs for linear proportional speed control, and each circuit operates independently. This invention adds overload protection to the reversing linkage to protect the cylinder from sudden impacts by providing pressure relief. This invention separates the bottom tensioning cylinder onto the tail assembly, ensuring that tensioning operation does not affect the pressure of other actions. An overflow valve is added at the tensioning point to protect the cylinder. A solenoid valve is also included, which is operated during unloading and return to the chain to control the tensioning function. This allows the solenoid valve to be closed to protect the chain from damage during unloading when high pressure and impact are not required, and opened to ensure smooth return when tensioning is needed during return. This meets actual working conditions, saves space, and features separate return ports (TA and TS) that are not connected to the main circuit, enabling precise control.

[0033] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A multi-way valve for a conveyor-type dump truck, characterized in that: It includes an oil inlet line and a tail line, as well as three reversing lines arranged in parallel between the oil inlet line and the tail line. It also includes a main oil inlet, an oil return port, a first separate oil return port, a second separate oil return port, and a load feedback oil port. The oil inlet valve includes a differential pressure valve, a flow valve, and an LS relief valve; The reversing linkage includes a reversing valve, a pressure compensation valve, and a check valve; The tail assembly includes a first pressure reducing valve, a second pressure reducing valve, an overflow valve, and a tensioning solenoid valve; The oil inlet of the differential pressure valve is connected to the main oil inlet, the oil outlet of the differential pressure valve is connected to the return oil port, the spring chamber of the differential pressure valve, the oil inlet of the flow valve and the oil inlet of the LS relief valve are connected to the load feedback oil port; the oil outlets of the flow valve and the LS relief valve are connected to the return oil port and the first separate return oil port. The inlet of the directional control valve is connected to the main inlet, the outlet of the directional control valve is connected to the inlet of the pressure compensation valve, the outlet of the pressure compensation valve is connected to the inlet of the check valve, the outlet of the check valve is connected to the working inlet of the directional control valve, the working outlet of the directional control valve is connected to the return port, and the two load ports of the directional control valve are respectively used to connect to the two ports of the hydraulic cylinder; the sensing outlet of the pressure compensation valve is connected to the load feedback port. The inlets of the first and second pressure-reducing valves are connected to the main inlet. The outlet of the first pressure-reducing valve is connected to the inlets of six pilot solenoid valves. Each directional valve is connected to two pilot solenoid valves and controls the valve stem to switch directions through the two pilot solenoid valves to control the extension and retraction of the cylinder. The outlet of the second pressure-reducing valve is connected to the inlet of the tensioning solenoid valve and the relief valve. The tensioning solenoid valve is used to connect to the tensioning cylinder to control the opening and closing of the tensioning. The spring chambers of the first and second pressure-reducing valves and the outlet of the relief valve are connected to the second separate return port.

2. The multi-way valve for a conveyor-type dump truck according to claim 1, characterized in that: In one, two, or three of the reversing connections, the two load ports of the reversing valve are respectively connected to the inlet ports of two overload valves, and the outlet port of the overload valve is connected to the return port.

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