Power head floating oil supplementing valve and rotary drilling rig

Abstract

The invention provides a power head floating oil supplementing valve which comprises a first main oil way, a second main oil way, a motor and a switch valve, two first oil ports are formed in one end of the first main oil way, two second oil ports are formed in one end of the second main oil way, the motor is communicated with the first main oil way and the second main oil way, and the switch valve is connected with the motor. The switch valve is connected between the first main oil way and the second main oil way, and when the rotary drilling rig uses the lower protective cylinder of the pipe rolling machine, the switch valve is controlled to communicate the first main oil way and the second main oil way, so that a power head of the rotary drilling rig rotates along with a load. According to the floating oil supplementing valve for the power head, the problem that when the power head connected with a pile casing is used, the power head is held still, or when the power head is serious, structural parts are damaged can be solved, and the construction efficiency is improved; meanwhile, the oil supplementing function is enhanced, air suction is avoided, and the reliability of the motor is improved; the invention further relates to the rotary drilling rig.

Description

Technical Field

[0001] The invention relates to the technical field of foundation construction, in particular to a floating oil replenishing valve for a power head and a rotary drilling rig. Background Art

[0002] When a traditional rotary drilling rig is used in conjunction with a pipe rolling machine, its power head is mechanically connected to the casing, and the pipe rolling machine drives the casing to rotate. At this time, the power head is in a locked state, and the traditional power head oil supply valve has no floating function, which will cause the pipe rolling machine to drive the casing to rotate, while the power head is locked by the hydraulic system and does not rotate, and the structural connection part is damaged; due to the lack of an overflow valve, the oil supply function cannot be fully utilized. When a rotary drilling rig is drilling hard rock, the load is usually discontinuous and sometimes blocked. At the moment of crushing, the load may be very small, causing the motor to rotate rapidly. In this case, even if there is an oil supply pump, it cannot respond quickly to replenish oil, which is prone to emptying and affects the life of the motor; when there is an overflow valve, when the load is suddenly too large and exceeds the set pressure of the overflow valve, the two oil ports of the power head motor are immediately connected. The overflow valve usually has some hysteresis, so that when it is just overflowing, the motor meets the oil absorption requirement when the load suddenly becomes smaller after the pressure is blocked, which makes up for the poor oil supply performance. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a floating oil supply valve for a power head, which can avoid the problem of the power head being stuck and not moving when using a power head connected to a casing, or causing damage to structural parts in serious cases, thereby improving construction efficiency; at the same time, it adds an oil supply function to avoid air suction and improve motor reliability.

[0004] The present invention provides a floating oil replenishing valve for a power head, comprising a first main oil circuit, a second main oil circuit, a motor and a switch valve, wherein one end of the first main oil circuit is provided with two first oil ports, one end of the second main oil circuit is provided with two second oil ports, the motor is connected to the first main oil circuit and the second main oil circuit, and the switch valve is connected between the first main oil circuit and the second main oil circuit. When the rotary drilling rig uses a pipe rolling machine to lower a casing, the switch valve is controlled to connect the first main oil circuit and the second main oil circuit, so that the power head of the rotary drilling rig rotates following the load.

[0005] In one embodiment, the floating oil replenishing valve of the power head includes a first overflow valve and a second overflow valve, the first overflow valve and the second overflow valve are arranged in parallel, the first overflow valve and the second overflow valve are respectively connected between the first main oil circuit and the second main oil circuit, the first overflow valve allows the oil in the first main oil circuit to enter the second main oil circuit, and the second overflow valve allows the oil in the second main oil circuit to enter the first main oil circuit.

[0006] In one embodiment, a first oil circuit is connected between the first main oil circuit and the second main oil circuit, the first oil circuit is connected to the oil replenishing port, the first oil circuit is provided with a first one-way valve and a second one-way valve, the first one-way valve allows the oil in the oil replenishing port to flow to the first main oil circuit, and the second one-way valve allows the oil in the oil replenishing port to flow to the second main oil circuit.

[0007] In one embodiment, there are three motors, namely a first motor, a second motor and a third motor. The first motor is provided with a first connection port and a second connection port, the first connection port is connected to the first main oil circuit, and the second connection port is connected to the second main oil circuit; the second motor is provided with a third connection port and a fourth connection port, the third connection port is connected to the first main oil circuit, and the fourth connection port is connected to the second main oil circuit; the third motor is provided with a fifth connection port and a sixth connection port, the fifth connection port is connected to the first main oil circuit, and the sixth connection port is connected to the second main oil circuit.

[0008] In one embodiment, the oil from the two first oil ports respectively enters the first motor, the second motor and the third motor through the first main oil circuit, and then flows out from the two second oil ports through the second main oil circuit; or the oil from the two second oil ports respectively enters the first motor, the second motor and the third motor through the second main oil circuit, and then flows out from the two first oil ports through the first main oil circuit; so as to realize simultaneous forward rotation or simultaneous reverse rotation of the first motor, the second motor and the third motor.

[0009] In one embodiment, the floating oil replenishing valve of the power head also includes a main control valve, and the main control valve includes a first gear position, a middle position and a second gear position. The first gear position is for oil inlet from the two first oil ports, the second gear position is for oil inlet from the two second oil ports, and the middle position is a closed state. By controlling the main control valve to control the oil inlet or oil outlet of the first oil port and the second oil port, the forward or reverse rotation of the power head can be achieved.

[0010] In one embodiment, the switch valve is connected to a controller, and the controller controls the opening or closing of the switch valve.

[0011] In one embodiment, the switch valve is a solenoid valve.

[0012] The present invention also relates to a rotary drilling rig, comprising the above-mentioned floating oil replenishing valve for the power head.

[0013] The floating oil replenishing valve of the power head of the present invention is provided with a switch valve, and the connection and disconnection of the first oil port and the second oil port are realized by controlling the opening and closing of the switch valve. When the power head and the tube rolling machine need to be used in conjunction with each other, and the power head and the casing are connected together, the switch valve is controlled to open by the controller. At this time, the first oil port of the first main oil circuit is connected with the second oil port of the second main oil circuit, and the power head can rotate with the rotation of the load to avoid damage to the structural parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 It is a hydraulic principle diagram of the power head floating oil replenishing valve of the present invention.

[0016] Description of the reference numerals: first oil port-A; second oil port-B; first connection port-C1; second connection port-D1; third connection port-C2; fourth connection port-D2; fifth connection port-C3; sixth connection port-D3; oil replenishment port-S; first main oil circuit-11; second main oil circuit-12; switch valve-13; first relief valve-141; second relief valve-142; first check valve-151; second check valve-152;

[0017] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0020] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0022] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0023] like Figure 1 As shown, the power head of this embodiment is a power head used in combination with a pipe rolling machine for a rotary drilling rig. The floating oil replenishing valve of the power head includes a first main oil circuit 11, a second main oil circuit 12, a motor and a switch valve 13. Two first oil ports A are provided at one end of the first main oil circuit 11, and two second oil ports B are provided at one end of the second main oil circuit 12. The motor is connected to the first main oil circuit 11 and the second main oil circuit 12. The switch valve 13 is connected between the first main oil circuit 11 and the second main oil circuit 12. When the rotary drilling rig uses the pipe rolling machine to lower the casing, the switch valve 13 is controlled to connect the first main oil circuit 11 and the second main oil circuit 12, so that the power head of the rotary drilling rig rotates with the load. Among them, the switch valve 13 is connected to the controller, and the controller controls the opening or closing of the switch valve 13, and the switch valve 13 is a solenoid valve; there are three motors, namely the first motor, the second motor and the third motor, the first motor is provided with a first connection port C1 and a second connection port D1, the first connection port C1 is connected to the first main oil circuit 11, and the second connection port D1 is connected to the second main oil circuit 12; the second motor is provided with a third connection port C2 and a fourth connection port D2, the third connection port C2 is connected to the first main oil circuit 11, and the fourth connection port D2 is connected to the second main oil circuit 12; the third motor is provided with a fifth connection port C3 and a sixth connection port D3, the fifth connection port C3 is connected to the first main oil circuit 11, and the sixth connection port D3 is connected to the second main oil circuit 12. In this embodiment, when the power head and the tube rolling machine need to be used in conjunction, the switch valve 13 is controlled to open by the controller, at this time, the first oil port A of the first main oil circuit 11 is connected to the second oil port B of the second main oil circuit 12, and the power head can rotate with the rotation of the load to avoid damage to the structural parts.

[0024] Preferably, the first main oil circuit 11 is connected with the second main oil circuit 12 through the first oil circuit 11, and the first oil circuit 11 is connected with the oil replenishing port S, and the oil replenishing port S is used to replenish oil to the first main oil circuit 11 or the second main oil circuit 12, and the first oil circuit 11 is provided with a first one-way valve 151 and a second one-way valve 152, the first one-way valve 151 allows the oil in the oil replenishing port S to flow to the first main oil circuit 11, and the second one-way valve 152 allows the oil in the oil replenishing port S to flow to the second main oil circuit 12.

[0025] Preferably, the floating oil replenishing valve of the power head includes a first relief valve 141 and a second relief valve 142, the first relief valve 141 and the second relief valve 142 are arranged in parallel, the first relief valve 141 and the second relief valve 142 are respectively connected between the first main oil circuit 11 and the second main oil circuit 12, the first relief valve 141 allows the oil in the first main oil circuit 11 to enter the second main oil circuit 12, and the second relief valve 142 allows the oil in the second main oil circuit 12 to enter the first main oil circuit 11. In this embodiment, the first relief valve 141 and the second relief valve 142 are used to protect the system pressure from not exceeding the set pressure of the first relief valve 141 and the set pressure of the second relief valve 142. In addition, when the power head is shaking the soil, the first oil port A and the second oil port B need to be frequently switched, and when the oil in the replenishing port S cannot meet the oil demand, the first relief valve 141 and the second relief valve 142 also have the function of replenishing the first main oil circuit 11 or the second main oil circuit 12.

[0026] Preferably, the oil from the two first oil ports A respectively enters the first motor, the second motor and the third motor through the first main oil circuit 11, and then flows out from the two second oil ports B through the second main oil circuit 12; or the oil from the two second oil ports B respectively enters the first motor, the second motor and the third motor through the second main oil circuit 12, and then flows out from the two first oil ports A through the first main oil circuit 11; so as to realize simultaneous forward rotation or simultaneous reverse rotation of the first motor, the second motor and the third motor.

[0027] Preferably, the floating oil replenishing valve of the power head also includes a main control valve, which includes a first gear position, a middle position and a second gear position. The first gear position is for oil inlet from two first oil ports A, the second gear position is for oil inlet from two second oil ports B, and the middle position is a closed state. By controlling the main control valve to control the oil inlet or outlet from the first oil port A and the second oil port B, the forward or reverse rotation of the power head can be achieved.

[0028] The present invention also relates to a rotary drilling rig, comprising the above-mentioned floating oil replenishing valve for the power head.

[0029] The floating oil replenishing valve of the power head of the present invention is provided with a switch valve 13, and the connection and disconnection of the first oil port A and the second oil port B are realized by controlling the opening and closing of the switch valve 13. When the power head and the tube rolling machine need to be used in conjunction, and the power head and the casing are connected together, the switch valve 13 is controlled by the controller to open. At this time, the first oil port A of the first main oil circuit 11 is connected with the second oil port B of the second main oil circuit 12, and the power head can rotate with the rotation of the load to avoid damage to the structural parts.

[0030] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A floating oil replenishing valve for a power head, characterized in that: The invention comprises a first main oil circuit (11), a second main oil circuit (12), a motor and a switch valve (13); one end of the first main oil circuit (11) is provided with two first oil ports (A); one end of the second main oil circuit (12) is provided with two second oil ports (B); the motor is connected to the first main oil circuit (11) and the second main oil circuit (12); the switch valve (13) is connected between the first main oil circuit (11) and the second main oil circuit (12); when the rotary drilling rig uses a pipe rolling machine to lower casing, the switch valve (13) is controlled to connect the first main oil circuit (11) and the second main oil circuit (12), so that the power head of the rotary drilling rig rotates following the load.

2. The floating oil replenishing valve of the power head according to claim 1, characterized in that: The floating oil replenishing valve of the rotary drilling rig power head comprises a first overflow valve (141) and a second overflow valve (142). The first overflow valve (141) and the second overflow valve (142) are arranged in parallel. The first overflow valve (141) and the second overflow valve (142) are respectively connected between the first main oil circuit (11) and the second main oil circuit (12). The first overflow valve (141) allows the oil in the first main oil circuit (11) to enter the second main oil circuit (12), and the second overflow valve (142) allows the oil in the second main oil circuit (12) to enter the first main oil circuit (11).

3. The floating oil replenishing valve of the power head according to claim 2, characterized in that: A first oil circuit (11) is connected between the first main oil circuit (11) and the second main oil circuit (12); the first oil circuit (11) is connected to an oil replenishing port (S); the first oil circuit (11) is provided with a first check valve (151) and a second check valve (152); the first check valve (151) allows the oil in the oil replenishing port (S) to flow to the first main oil circuit (11); and the second check valve (152) allows the oil in the oil replenishing port (S) to flow to the second main oil circuit (12).

4. The power head floating oil replenishing valve according to claim 1, characterized in that: The motors are provided with three, namely a first motor, a second motor and a third motor. The first motor is provided with a first connection port (C1) and a second connection port (D1). The first connection port (C1) is connected to the first main oil circuit (11), and the second connection port (D1) is connected to the second main oil circuit (12). The second motor is provided with a third connection port (C2) and a fourth connection port (D2). The third connection port (C2) is connected to the first main oil circuit (11), and the fourth connection port (D2) is connected to the second main oil circuit (12). The third motor is provided with a fifth connection port (C3) and a sixth connection port (D3). The fifth connection port (C3) is connected to the first main oil circuit (11), and the sixth connection port (D3) is connected to the second main oil circuit (12).

5. The floating oil replenishing valve of the power head according to claim 4, characterized in that: The oil from the two first oil ports (A) respectively enters the first motor, the second motor and the third motor through the first main oil circuit (11), and then flows out from the two second oil ports (B) through the second main oil circuit (12); or the oil from the two second oil ports (B) respectively enters the first motor, the second motor and the third motor through the second main oil circuit (12), and then flows out from the two first oil ports (A) through the first main oil circuit (11); so as to realize simultaneous forward rotation or simultaneous reverse rotation of the first motor, the second motor and the third motor.

6. The floating oil replenishing valve of the power head according to claim 5, characterized in that: The floating oil replenishing valve of the power head also includes a main control valve, which includes a first gear position, a middle position and a second gear position. The first gear position is for oil to enter the two first oil ports (A), and the second gear position is for oil to enter the two second oil ports (B). The middle position is a closed state. By controlling the main control valve to control the oil inlet or outlet of the first oil port (A) and the second oil port (B), the forward or reverse rotation of the power head can be achieved.

7. The power head floating oil replenishing valve according to claim 1, characterized in that: The switch valve (13) is connected to a controller, and the controller controls the opening or closing of the switch valve (13).

8. The floating oil replenishing valve of the power head according to claim 7, characterized in that: The switch valve (13) is a solenoid valve.

9. A rotary drilling rig, characterized in that: It comprises the floating oil replenishing valve of the power head as described in any one of claims 1 to 8.

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