Hydraulic control valve group of large pressurizing oil cylinder

Abstract

The utility model relates to the technical field of control valve banks, in particular to a hydraulic control valve bank of a large pressurizing oil cylinder. The device mainly aims at the situation that a power head needs to be controlled to ascend and descend in the construction process. In order to solve the problems of how to realize the conditions of rapid movement of a power head, slow movement of the power head and hovering of a drill rod or the power head in the process, the utility model provides the following technical scheme that the hydraulic control valve comprises a valve body, an oil way is arranged in the valve body, a connecting port CR1 and a connecting port CR2 which are communicated with the oil way are arranged on the valve body, and the connecting port CR1 and the connecting port CR2 are communicated with the oil way. The valve body is provided with a connecting port CR1 and a connecting port CR2, the connecting port CR1 and the connecting port CR2 are connected with rod cavities of the two oil cylinders respectively, the valve body is further provided with a connecting port CB1 and a connecting port CB2 which are communicated with the oil way, and the connecting port CB1 and the connecting port CB2 are connected with rodless cavities of the two oil cylinders respectively. According to the utility model, the rapid descending, pressing, lifting and hovering operations of the power head can be realized, so that the high-precision operation of the power head is realized, and meanwhile, the safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of control valve groups, in particular to a hydraulic control valve group of a large-scale pressurized oil cylinder. Background Art

[0002] In the operation of mining and pile-driving machinery, precise control of the power head is essential for safety and efficiency. These machines usually use a hydraulic system to control the movement of the power head. The hydraulic system is composed of a hydraulic pump, a hydraulic cylinder, a hydraulic valve and a pipeline, and can provide high-pressure, high-flow hydraulic oil to achieve fast and precise movement of the power head. Fast movement is usually achieved by increasing the oil flow and pressure, while slow movement requires precise control of the oil flow and the opening of the valve to ensure that the power head can stay accurately at the required position. Large drilling rigs or pile-driving machinery used in mines need to control the rise and fall of the power head during construction. Several states in this process: how to achieve the rapid movement of the power head, the slow movement of the power head, and the hovering working conditions of the drill rod or the power head is a difficult problem. In view of this, the utility model proposes a hydraulic control valve group for a large pressurized oil cylinder. Utility Model Content

[0003] The purpose of the utility model is to solve the problem that the power head needs to be controlled to rise and fall during the construction process in the background technology. Several states in this process: fast movement of the power head, slow movement of the power head, and suspension of the drill rod or the power head are required to be realized, and a hydraulic control valve group of a large pressurized oil cylinder is proposed.

[0004] The technical solution of the utility model: a hydraulic control valve group of a large pressurized oil cylinder, comprising a valve body, an oil circuit is arranged in the valve body, a connecting port CR1 and a connecting port CR2 connected with the oil circuit are arranged on the valve body, the connecting port CR1 and the connecting port CR2 are respectively connected with the rod chambers of two oil cylinders, a connecting port CB1 and a connecting port CB2 connected with the oil circuit are also arranged on the valve body, the connecting port CB1 and the connecting port CB2 are respectively connected with the rodless chambers of two oil cylinders, and a PB oil inlet and a PR oil return port connected with the oil circuit are also arranged on the valve body; a hydraulic control system installed on the valve body, the hydraulic control system comprising a first one-way valve, a second one-way valve, a first balancing valve, a second balancing valve, and a sequential valve, the first one-way valve, the second one-way valve, the first balancing valve, the second balancing valve, and the sequential valve are all installed on the valve body and connected through the oil circuit.

[0005] Optionally, the PB oil inlet is connected to the output end of the second one-way valve through an oil circuit, the input end of the second one-way valve is connected to the sequence valve through an oil circuit, the oil circuit connected to the output end of the second one-way valve is connected to the connecting port CB1 and the connecting port CB2, and the oil circuit on the side of the sequence valve away from the second one-way valve is connected to the connecting port CR1 and the connecting port CR2.

[0006] Optionally, the PR oil return port is connected to the second balancing valve through an oil circuit, a first one-way valve arranged on one side of the second balancing valve is connected in parallel with the second balancing valve through the oil circuit, and an input end of the first one-way valve faces the PR oil return port.

[0007] Optionally, the first balancing valve is connected to the oil circuit between the PB oil inlet and the second one-way valve through an oil circuit, and the valve body is further provided with an oil replenishing port T communicating with the first balancing valve.

[0008] Optionally, a pressure measuring port M is further provided on the valve body, and a second plug is installed at the position of the pressure measuring port M.

[0009] Optionally, the valve body is further provided with a pressure measuring port G1 and a pressure measuring port G2, and a third plug is installed at the pressure measuring port G1 and the pressure measuring port G2.

[0010] Optionally, a fourth plug and a fifth plug are installed on the valve body.

[0011] Optionally, a plurality of sets of first plugs are installed on the valve body.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] The utility model uses the setting of the hydraulic control system to make the PB oil inlet take in oil and the PR oil return port return oil, and the pressure of the PB oil inlet is kept at a relatively low state, so that the power head is in a rapidly descending working condition; at the same time, when the pressure of the PB oil inlet increases to a set value, the power head is in a pressurized state of the oil cylinder, works under a high load state, and realizes a downward pressure operation;

[0014] Further, through the setting of the first balancing valve, after the first balancing valve is locked, oil flows into the PR oil return port and oil returns from the PB oil inlet port, and the power head is lifted;

[0015] Further, through the setting of the sequence valve, when the sequence valve is closed, there is no flow of hydraulic oil between the PB oil inlet and the PR oil return port, and the power head is in a suspended state;

[0016] In summary, the utility model can realize the rapid descent, downward pressure, lifting and hovering operations of the power head, thereby achieving high-precision operation of the power head while ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a hydraulic control valve group of a large pressurized oil cylinder;

[0018] Figure 2 is a schematic diagram of the structure of a first one-way valve;

[0019] Figure 3 yes Figure 1 Schematic diagram of the disassembled structure;

[0020] Figure 4 It is a schematic diagram of the oil circuit.

[0021] Reference numerals:

[0022] 1. Valve body; 2. First plug; 3. Second plug; 4. First one-way valve; 5. Third plug; 6. Second one-way valve; 7. First balancing valve; 8. Second balancing valve; 9. Fourth plug; 10. Sequence valve; 11. Fifth plug. DETAILED DESCRIPTION

[0023] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0024] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0025] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", "fourth", and "fifth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 invention can be understood according to specific circumstances.

[0028] Example

[0029] like Figure 1-4 As shown, the utility model proposes a hydraulic control valve group for a large pressurized oil cylinder, including a valve body 1, an oil circuit is provided in the valve body 1, a connecting port CR1 and a connecting port CR2 connected to the oil circuit are provided on the valve body 1, the connecting port CR1 and the connecting port CR2 are respectively connected to the rod chambers of the two oil cylinders, the valve body 1 is also provided with a connecting port CB1 and a connecting port CB2 connected to the oil circuit, the connecting port CB1 and the connecting port CB2 are respectively connected to the rodless chambers of the two oil cylinders, and the valve body 1 is also provided with a PB oil inlet and a PR oil return port connected to the oil circuit.

[0030] A hydraulic control system installed on the valve body 1, the hydraulic control system includes a first one-way valve 4, a second one-way valve 6, a first balancing valve 7, a second balancing valve 8, and a sequence valve 10. The first one-way valve 4, the second one-way valve 6, the first balancing valve 7, the second balancing valve 8, and the sequence valve 10 are all installed on the valve body 1 and connected through an oil circuit, and each part must be assembled according to the specified torque.

[0031] Further, the oil inlet of PB is connected to the output end of the second one-way valve 6 through the oil circuit, the input end of the second one-way valve 6 is connected to the sequence valve 10 through the oil circuit, the oil circuit connected to the output end of the second one-way valve 6 is connected to the connection port CB1 and the connection port CB2, and the second one-way valve 6 is used to control the one-way flow of hydraulic oil and prevent the fluctuation caused by the instability of the outlet pressure of the sequence valve 10, so that the sequence valve 10 is in a stable working range. The oil circuit on the side of the sequence valve 10 away from the second one-way valve 6 is connected to the connection port CR1 and the connection port CR2.

[0032] Furthermore, the PR oil return port is connected to the second balancing valve 8 through an oil circuit, and the first check valve 4 arranged on one side of the second balancing valve 8 is connected in parallel with the second balancing valve 8 through the oil circuit, and the input end of the first check valve 4 faces the PR oil return port, the flow capacity of the second balancing valve 8 is limited, and the first check valve 4 is used to increase the flow capacity. The first balancing valve 7 is connected to the oil circuit between the PB oil inlet and the second check valve 6 through the oil circuit, and the valve body 1 is also provided with an oil replenishment port T connected to the first balancing valve 7. When the power head descends due to gravity and the oil in the PB oil inlet is insufficient, the first balancing valve 7 can replenish oil to meet the use requirements of the system.

[0033] Specifically, when oil is entering the PB oil inlet and returning oil to the PR oil return port, there are two working states. First, when the pressure at the PB oil inlet is relatively low, the sequence valve 10 opens, and the oil in the rod chamber is discharged through the connection ports CR1 and CR2, and quickly enters the rodless chamber through the connection ports CB1 and CB2, realizing the differential function of the oil cylinder and putting the power head in a rapidly descending working condition. Secondly, when the pressure at the PB oil inlet increases to the set value, the second balancing valve 8 is opened. At this time, the power head is in the pressurized state of the oil cylinder and works under a high load state.

[0034] When oil enters the PR oil return port and returns oil to the PB oil inlet port, the power head is in the lifting working condition. Since the oil return side is the side of the rodless chamber, a large amount of oil will return. In order to avoid the pressure increase of the rod chamber caused by the pressure holding, the first balance valve 7 is opened.

[0035] When there is no flow of hydraulic oil between the PB oil inlet and the PR oil return, the power head is in a suspended state. At this time, the sequence valve 10 remains closed, so that the pipelines of the connection ports CR1 and CR2 are pressurized, thereby achieving suspension of the power head.

[0036] The valve body 1 is also provided with a pressure measuring port M, a pressure measuring port G1 and a pressure measuring port G2, which are used to conveniently debug the pressure of the sequence valve 10 and the opening pressure of the first balancing valve 7 and the second balancing valve 8. A second plug 3 is installed at the pressure measuring port M, a third plug 5 is installed at the pressure measuring port G1 and the pressure measuring port G2, a fourth plug 9 and a fifth plug 11 are installed on the valve body 1, and multiple groups of first plugs 2 are installed on the valve body 1 to seal the oil circuit and ensure the stable operation of the hydraulic system.

[0037] In this embodiment, when the power head needs to descend quickly, oil is taken in through the PB oil inlet and returned through the PR oil return port, and the pressure of the PB oil inlet is kept at a low state. At the same time, the sequence valve 10 is opened, and the oil in the rod chamber is discharged through the connecting port CR1 and the connecting port CR2, and quickly enters the rodless chamber through the connecting port CB1 and the connecting port CB2, thereby realizing the differential function of the oil cylinder and putting the power head in a rapid descending condition.

[0038] When the power head needs to be pressed down, oil is taken in through the PB oil inlet and returned through the PR oil return port. At the same time, when the pressure at the PB oil inlet increases to the set value, the second balancing valve 8 is opened. At this time, the power head is in the pressurized state of the cylinder and works under high load.

[0039] When the power head needs to be lifted, oil enters the PR oil return port and returns oil to the PB oil inlet port. This is the lifting working condition of the power head. Since the oil return side is the side of the rodless cavity, a large amount of oil will return. In order to avoid the pressure increase of the rod cavity caused by the pressure holding, the first balance valve 7 is opened.

[0040] When the power head needs to be kept in a hovering state, there is no flow of hydraulic oil between the PB oil inlet and the PR oil return port, and the power head is in a hovering state. At this time, the sequence valve 10 remains closed, so that the pipelines of the connection ports CR1 and CR2 are pressurized, thereby achieving the hovering of the power head.

[0041] The above specific embodiment is only an optional embodiment of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above embodiment, those skilled in the art can make various alternative improvements and combinations to the above specific embodiment.

Claims

1. A hydraulic control valve group for a large pressurized oil cylinder, characterized in that: include: A valve body (1), wherein an oil circuit is provided in the valve body (1), and the valve body (1) is provided with a connection port CR1 and a connection port CR2 connected to the oil circuit, and the connection port CR1 and the connection port CR2 are respectively connected to the rod chambers of two oil cylinders, and the valve body (1) is also provided with a connection port CB1 and a connection port CB2 connected to the oil circuit, and the connection port CB1 and the connection port CB2 are respectively connected to the rodless chambers of the two oil cylinders, and the valve body (1) is also provided with a PB oil inlet and a PR oil return port connected to the oil circuit; A hydraulic control system is installed on the valve body (1), the hydraulic control system comprises a first one-way valve (4), a second one-way valve (6), a first balancing valve (7), a second balancing valve (8), and a sequence valve (10), wherein the first one-way valve (4), the second one-way valve (6), the first balancing valve (7), the second balancing valve (8), and the sequence valve (10) are all installed on the valve body (1) and are connected via an oil circuit.

2. A hydraulic control valve group for a large pressurized oil cylinder according to claim 1, characterized in that: The PB oil inlet is connected to the output end of the second one-way valve (6) via an oil circuit, the input end of the second one-way valve (6) is connected to the sequence valve (10) via an oil circuit, the oil circuit connected to the output end of the second one-way valve (6) is in communication with the connection port CB1 and the connection port CB2, and the oil circuit on the side of the sequence valve (10) away from the second one-way valve (6) is in communication with the connection port CR1 and the connection port CR2.

3. The hydraulic control valve group of a large pressurized oil cylinder according to claim 1, characterized in that: The PR oil return port is connected to the second balancing valve (8) via an oil circuit, a first one-way valve (4) arranged on one side of the second balancing valve (8) is connected in parallel with the second balancing valve (8) via the oil circuit, and an input end of the first one-way valve (4) faces the PR oil return port.

4. The hydraulic control valve group of a large pressurized oil cylinder according to claim 1, characterized in that: The first balancing valve (7) is connected to the oil circuit between the PB oil inlet and the second one-way valve (6) through an oil circuit, and the valve body (1) is also provided with an oil replenishing port T communicating with the first balancing valve (7).

5. The hydraulic control valve group of a large pressurized oil cylinder according to claim 1, characterized in that: The valve body (1) is also provided with a pressure measuring port M, and a second plug (3) is installed at the position of the pressure measuring port M.

6. The hydraulic control valve group of a large pressurized oil cylinder according to claim 1, characterized in that: The valve body (1) is also provided with a pressure measuring port G1 and a pressure measuring port G2, and a third plug (5) is installed at the pressure measuring port G1 and the pressure measuring port G2.

7. The hydraulic control valve group of a large pressurized oil cylinder according to claim 1, characterized in that: A fourth plug (9) and a fifth plug (11) are installed on the valve body (1).

8. The hydraulic control valve group of a large pressurized oil cylinder according to claim 1, characterized in that: A plurality of groups of first plugs (2) are installed on the valve body (1).

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