A step constant power module valve

Abstract

The application discloses a step constant power module valve and relates to the field of hydraulic systems.The module valve is connected with a grouting pump system hydraulic cylinder, a main oil pump and an auxiliary oil pump, the main oil pump and the auxiliary oil pump are connected with an oil tank through pipelines provided with filters, an oil inlet on a three-position four-way valve is connected with the main oil pump and the auxiliary oil pump through pipelines respectively, an oil return port on the three-position four-way valve is connected with the oil tank through a return pipeline, and a high-speed overflow valve, a medium-speed overflow valve and a low-speed overflow valve are connected in parallel between the oil return port and the return pipeline.The application realizes safety protection through the three overflow valves according to different input flow and pressure of the main oil pump and the auxiliary oil pump, realizes constant power output under three different flow and pressure, and enables the operator to clearly know the pressure and flow data under different gears and oil pump working states under the constant power state.The corresponding module valve has simple structure and convenient operation control, so that the operator can clearly know the flow data and pressure when using.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic systems, and in particular relates to a multi-stage adjustable constant power modular valve used on grouting pumps in coal mining machinery and engineering machinery. Background Technology

[0002] In existing coal mine waterproof grouting and foundation construction grouting processes, constant flow and stable pressure are usually required to ensure accurate grouting volume and stable pressure. Current grouting pumps use mechanically driven three-cylinder single-plunger reciprocating cylinders, which are only suitable for situations with simple grouting processes and low flow and pressure control accuracy. They use constant power hydraulic pumps with hydraulic constant power transmission, and the adjustment process is all automatic, so the operator cannot clearly know the pressure and flow of the grouting pump. Existing technologies such as CN201811505928.X can meet the requirements of constant flow grouting pump hydraulic systems. These systems provide a modular valve structure consisting of rotary valves, hydraulic directional valves, first pipeline relief valves, second pipeline relief valves, and return oil control devices. The structure is relatively complex and cannot achieve three pressures and three constant power outputs, resulting in relatively low efficiency. Summary of the Invention

[0003] This invention provides a stepped constant power modular valve, which solves the above problems.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0005] The present invention provides a stepped constant power modular valve, which is connected to the hydraulic cylinder, main oil pump, and auxiliary oil pump of a grouting pump system. The main oil pump and auxiliary oil pump are connected to the oil tank through pipelines equipped with filters. The modular valve includes a three-position four-way valve, a high-speed relief valve, a medium-speed relief valve, and a low-speed relief valve.

[0006] The oil inlet of the three-position four-way valve in the middle position is connected to the main oil pump and the auxiliary oil pump respectively through pipelines; the oil return port of the three-position four-way valve in the middle position is connected to the oil tank through the return pipeline, and the high-speed relief valve, the medium-speed relief valve, and the low-speed relief valve are connected in parallel between the oil return port and the return pipeline; the first working oil port and the second working oil port of the three-position four-way valve in the middle position are connected to the cylinder working port of the hydraulic cylinder of the grouting pump system.

[0007] Furthermore, the high-speed overflow valve, medium-speed overflow valve, and low-speed overflow valve are all pipeline-type electromagnetic overflow valves.

[0008] Furthermore, the three-position four-way valve can be operated manually or as a solenoid valve.

[0009] During operation, it runs at low pressure and high speed. When the system requires a large flow output, the flow from both the main and auxiliary oil pumps enters the hydraulic cylinder of the grouting pump system together. Let the flow rate of the main oil pump be Q1 and the flow rate of the auxiliary oil pump be Q2. The total flow rate entering the system is Q1 + Q2. The controller only controls the high-speed relief valve to ensure that the pressure does not exceed the rated value during high flow, achieving constant power output. During medium-pressure, medium-speed operation, when the system flow requirement is not high, the auxiliary oil pump is unloaded. At this time, only the flow rate from the main oil pump enters the hydraulic cylinder of the grouting pump system together with the flow from the main oil pump. In the hydraulic cylinder system, only the flow rate Q1 enters, and the controller only controls the operation of the medium-speed relief valve to ensure that the pressure does not exceed the rated value during medium-speed operation, thus achieving constant power output. In the high-pressure slow-speed operation, when the system requires a higher working pressure, the main oil pump is unloaded, and only the flow rate of the auxiliary oil pump enters the three-position four-way valve and the hydraulic cylinder system of the grouting pump system, that is, only the flow rate Q2 enters. At the same time, the controller only controls the operation of the low-speed relief valve to ensure that the pressure does not exceed the rated value during high-pressure slow-speed operation, thus achieving constant power output.

[0010] The present invention has the following advantages over the prior art:

[0011] This invention provides a stepped constant power modular valve structure. Based on the different input flow rates and pressures of the main oil pump and auxiliary oil pump, three relief valves provide safety protection. It achieves constant power output under three different flow rates and pressures, allowing the operator to clearly understand the pressure and flow data at different speeds and pump operating states under constant power conditions. It has high efficiency, and the modular valve has a simple structure and is easy to operate and control, making the flow and pressure data clearer for the operator during use.

[0012] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of 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.

[0014] Figure 1 This is a schematic diagram of the structure of a stepped constant power modular valve connected to an oil tank and a hydraulic cylinder of a grouting pump system according to the present invention.

[0015] The attached diagram lists the components represented by each number as follows:

[0016] 1-Main oil pump, 2-Auxiliary oil pump, 3-Low-speed relief valve, 4-Medium-speed relief valve, 5-High-speed relief valve, 6-Three-position four-way valve, 7-Oil tank, 701-Filter, 8-Return pipeline, 9-Hydraulic cylinder of grouting pump system, A-First working oil port, B-Second working oil port, P-Inlet oil port, T-Return oil port. Detailed Implementation

[0017] 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.

[0018] In the description of this invention, it should be understood that the terms "mid position," "upper," "parallel," etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0019] In existing coal mine, tunnel, and foundation construction scenarios, rotary drilling rigs are often used for grouting operations. A crucial component of a rotary drilling rig is the grouting pump, which consists of a reciprocating hydraulic cylinder and a hydraulic end that work together to draw in and discharge grout. Existing technologies, such as application number CN202022215125.X (titled "Rapid Forward and Backward Control Device for Column-Mounted and Frame-Type Hydraulic Rotary Drilling Rigs") and application number CN201822065392.6 (titled "Technology of a Grouting Pump Hydraulic System Capable of Meeting Constant Flow"), clearly illustrate the working principles of existing grouting pumps and present technical solutions for novel grouting pump hydraulic systems. This technical solution primarily focuses on the grouting pump system within a rotary drilling rig. The hydraulic cylinder of the grout pump is controlled by a stepped constant power modular valve. Here, "stepped" means that it can provide three different levels of pressure and corresponding constant power according to different construction scenarios and geological conditions. The power is set at a suitable constant value before grouting. Here, "stepped" can also be called "adjustable". The corresponding flow rate is the pressure displayed by the pressure gauge. The higher the pressure, the lower the flow rate. The existing grouting pump and hydraulic valve system is relatively complex in structure and cannot achieve the corresponding three different flow rates and corresponding constant power output. The operator cannot have a clear perception and understanding of the flow data and pressure when using it. Therefore, the following technical solution of the present invention is provided.

[0020] Please see Figure 1As shown, a stepped constant power modular valve of the present invention is connected to the hydraulic cylinder 9, main oil pump 1, and auxiliary oil pump 2 of the grouting pump system. The main oil pump 1 and auxiliary oil pump 2 are connected to the oil tank 7 through pipelines equipped with filters 701. The modular valve includes a three-position four-way valve 6, a high-speed relief valve 5, a medium-speed relief valve 4, and a low-speed relief valve 3. The high-speed relief valve 5, the medium-speed relief valve 4, and the low-speed relief valve 3 are all pipeline-type electromagnetic relief valves. The three-position four-way valve 6 is either manual or electromagnetic. In this specific embodiment, the corresponding three-position four-way valve 6 is a manual valve, and a conventional model can be used. The corresponding high-speed relief valve 5, medium-speed relief valve 4, and low-speed relief valve 3 are Dekma Yuken type EBG-03 electro-hydraulic proportional relief valves.

[0021] The oil inlet P of the three-position four-way valve 6, which is in the middle position, is connected to the main oil pump 1 and the auxiliary oil pump 2 through pipelines respectively; the oil return port T of the three-position four-way valve 6, which is in the middle position, is connected to the oil tank 7 through the return pipeline 8, and the high-speed relief valve 5, the medium-speed relief valve 4, and the low-speed relief valve 3 are connected in parallel between the oil return port T and the return pipeline 8; the first working oil port A and the second working oil port B of the three-position four-way valve 6, which are in the middle position, are connected to the working port of the hydraulic cylinder 9 of the grouting pump system.

[0022] When using:

[0023] When the system requires a large flow output during low-pressure rapid operation, manually switch the three-position four-way valve 6 so that the flow from the main oil pump 1 and the auxiliary oil pump 2 enters the system of the hydraulic cylinder 9 of the grouting pump system together through the three-position four-way valve 6. Let the flow of the main oil pump 1 be Q1 and the flow of the auxiliary oil pump 2 be Q2. At this time, the flow entering is Q1+Q2. The controller only controls the high-speed relief valve 5 to work, ensuring that the pressure will not exceed the rated value when the flow is large, thus achieving constant power output.

[0024] When operating at medium pressure and medium speed, under conditions where the system flow requirement is not high, manually switch the three-position four-way valve 6 to control the auxiliary oil pump 2 to unload. At this time, only the flow of the main oil pump 1 enters the system of the hydraulic cylinder 9 of the grouting pump system after entering the three-position four-way valve 6. That is, only the flow Q1 enters. Furthermore, the controller only controls the medium-speed relief valve 4 to work, ensuring that the pressure will not exceed the rated value during medium-speed operation and achieving constant power output.

[0025] When the system is operating at high pressure and slow speed, and the system requires a high working pressure, manually switch the three-position four-way valve 6. By controlling the main oil pump 1 to unload, only the flow of the auxiliary oil pump 2 enters the system of the hydraulic cylinder 9 of the grouting pump system, that is, only the flow of Q2 enters. At the same time, the controller controls only the low-speed relief valve 3 to work, so that the pressure will not exceed the rated value when operating at high pressure and slow speed, and constant power output is achieved.

[0026] Correspondingly, the flow rates of Q1+Q2 are greater than the overflow threshold of the high-speed overflow valve 5, and the portion exceeding the threshold is discharged by the high-speed overflow valve 5 and flows back into the oil tank 7; the flow rate of Q1 is greater than the overflow threshold of the medium-speed overflow valve 4, and the portion exceeding the threshold is discharged by the medium-speed overflow valve 4 and flows back into the oil tank 7; the flow rate of Q2 is greater than the overflow threshold of the low-speed overflow valve 3, and the portion exceeding the threshold is discharged by the low-speed overflow valve 3 and flows back into the oil tank 7; the above three methods achieve the output under three constant power conditions.

[0027] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A stepped constant power modular valve, connected to a hydraulic cylinder (9), a main oil pump (1), and an auxiliary oil pump (2) of a grouting pump system, wherein the main oil pump (1) and the auxiliary oil pump (2) are connected to an oil tank (7) via pipelines equipped with filters (701), characterized in that, The modular valve includes a three-position four-way valve (6), a high-speed relief valve (5), a medium-speed relief valve (4), and a low-speed relief valve (3); The oil inlet (P) of the three-position four-way valve (6) in the middle position is connected to the main oil pump (1) and the auxiliary oil pump (2) through pipelines respectively; the oil return port (T) of the three-position four-way valve (6) in the middle position is connected to the oil tank (7) through the return pipeline (8), and the high-speed relief valve (5), the medium-speed relief valve (4), and the low-speed relief valve (3) are connected in parallel between the oil return port (T) and the return pipeline (8); the first working oil port (A) and the second working oil port (B) of the three-position four-way valve (6) in the middle position are connected to the cylinder working port of the hydraulic cylinder (9) of the grouting pump system.

2. The stepped constant power modular valve according to claim 1, characterized in that, The high-speed overflow valve (5), medium-speed overflow valve (4), and low-speed overflow valve (3) are all pipeline electromagnetic overflow valves.

3. The stepped constant power modular valve according to claim 1, characterized in that, The three-position four-way valve (6) can be operated manually or as a solenoid valve.

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