Coaxial double power head drilling machine floating hydraulic system

Abstract

The utility model relates to a kind of coaxial double power head drilling machine floating hydraulic system, coaxial double power head drilling machine includes outer power head and inner power head;It further includes first floating oil cylinder and second floating oil cylinder;The cylinder body of first floating oil cylinder and second floating oil cylinder is hinged with outer power head, the piston rod of first floating oil cylinder and second floating oil cylinder is hinged with inner power head;It further includes reversing valve, pressure reducing valve, floating valve and hydraulic lock, reversing valve is connected with the hydraulic oil tank oil circuit of coaxial double power head drilling machine, reversing valve is connected with first floating oil cylinder and second floating oil cylinder oil circuit by hydraulic lock, first floating oil cylinder and second floating oil cylinder are parallelly connected;Floating valve is parallelly connected with hydraulic lock;Pressure reducing valve is connected with first floating oil cylinder and second floating oil cylinder oil circuit.The utility model can be in loading and unloading inner drill rod, after inner power head moves to position relative to outer power head, the pressure-maintaining type floating of later, the loading and unloading adjustment of inner drill rod is facilitated, and the probability that pressure-maintaining can reduce water flow into inner drill rod.

Description

Technical Field

[0001] This utility model relates to the hydraulic system of a drilling rig, specifically to a floating hydraulic system for a coaxial dual-power head drilling rig. Background Technology

[0002] The coaxial dual-power-head drilling rig is a type of trenchless drilling rig. Its drill frame is equipped with two power heads: an outer power head and an inner power head. The output of the outer power head drives the rotation and retraction of the outer drill rod; the output of the inner power head drives the rotation and retraction of the inner drill rod.

[0003] When in operation, the inner drill pipe is located inside the outer drill pipe. During the installation and removal of the inner drill pipe, the inner power head needs to be positioned away from the outer power head. Existing coaxial dual-power-head drilling rigs use a separate hydraulic cylinder to drive the inner power head relative to the outer power head. While this allows for the loading and unloading of the inner drill pipe, it prevents it from floating after being positioned, causing inconvenience during installation and removal. Furthermore, since water flows between the inner and outer drill pipes, if pressure cannot be maintained after the inner power head is moved into position, water will flow into the inner drill pipe, affecting normal construction operations. Utility Model Content

[0004] The purpose of this utility model is:

[0005] A floating hydraulic system for a coaxial dual-power head drilling rig is designed. By setting a first floating cylinder and a second floating cylinder between the outer power head and the inner power head, the floating hydraulic system enables the inner power head to float with pressure after moving into position relative to the outer power head during loading and unloading of the inner drill rod. This facilitates the loading, unloading, and adjustment of the inner drill rod, and the pressure holding reduces the probability of water flowing into the inner drill rod.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A floating hydraulic system for a coaxial dual-power-head drilling rig is disclosed. The coaxial dual-power-head drilling rig includes an outer power head and an inner power head, with the output ends of the outer and inner power heads coaxial. It also includes a first floating cylinder and a second floating cylinder; the cylinder bodies of both the first and second floating cylinders are hinged to the outer power head, and the piston rods of both are hinged to the inner power head. The system further includes a directional valve, a pressure-reducing valve, a floating valve, and a hydraulic lock. The directional valve is connected to the hydraulic oil tank of the coaxial dual-power-head drilling rig, and the directional valve is connected to the oil circuits of the first and second floating cylinders via the hydraulic lock. The first and second floating cylinders are connected in parallel. The floating valve is connected in parallel with the hydraulic lock. The pressure-reducing valve is connected to the oil circuits of the first and second floating cylinders.

[0008] Furthermore, the pressure reducing valve is connected to the floating valve and the hydraulic oil tank circuit of the coaxial dual-power head drilling rig.

[0009] Furthermore, the pressure reducing valve is connected to the floating valve oil circuit via a one-way valve; the pressure value of the pressure reducing valve is 2-4 MPa.

[0010] Furthermore, the directional valve is a three-position four-way solenoid directional valve, and the directional valve has a Y-type center positioner; the Y-type center positioner is connected to the hydraulic lock and the T-port oil circuit of the hydraulic oil tank of the coaxial dual-power head drilling rig.

[0011] Furthermore, the floating valve is a two-position two-way solenoid valve; the two valve ports of the floating valve are respectively connected to the oil ports of the first floating cylinder and the second floating cylinder.

[0012] Furthermore, the one-way valve passes through the pressure reducing valve from the first floating cylinder to the second floating cylinder.

[0013] Furthermore, the cylinder bodies of the first and second floating cylinders are hinged to the first connecting seats on both sides of the external power head; the piston rods of the first and second floating cylinders are hinged to the second connecting seats on both sides of the internal power head; and the piston rods of both the first and second floating cylinders are parallel to the output end of the external power head.

[0014] Furthermore, the internal power head is slidably mounted on the guide rod; the guide rod is parallel to the piston rods of the first and second floating cylinders.

[0015] The beneficial effects of this utility model are as follows:

[0016] A floating hydraulic system for a coaxial dual-power head drilling rig is disclosed. This system utilizes a first floating cylinder and a second floating cylinder positioned between the outer and inner power heads. These cylinders allow for displacement of the inner power head relative to the outer power head. In conjunction with a floating hydraulic system incorporating a directional valve, a pressure-reducing valve, a check valve, a floating valve, and a hydraulic lock, the system enables pressure-holding floating of the inner power head after it has moved into position relative to the outer power head during the loading and unloading of the inner drill rod. This facilitates the loading and unloading adjustment of the inner drill rod, reduces difficulties in its handling, and ensures smooth operation. Furthermore, the hydraulic system maintains pressure to minimize the likelihood of water flowing into the inner drill rod. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the mechanical structure of a coaxial dual-power head drilling rig floating hydraulic system according to the present invention.

[0018] Figure 2 for Figure 1 The front view of the structure shown.

[0019] Figure 3 for Figure 1 Top view of the structure shown.

[0020] Figure 4 This is a schematic diagram of the hydraulic principle of a coaxial dual-power head drilling rig floating hydraulic system according to the present invention.

[0021] The attached figures are labeled as follows:

[0022] 1. External power head; 2. Internal power head; 3. First connecting seat; 4. Second connecting seat; 5. Guide rod; 6. First floating cylinder; 7. Second floating cylinder; 8. Reversing valve; 9. Pressure reducing valve; 10. Check valve; 11. Floating valve; 12. Hydraulic lock. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0024] refer to Figures 1 to 4 A floating hydraulic system for a coaxial dual-power head drilling rig is disclosed, which is applied to a coaxial dual-power head drilling rig. The coaxial dual-power head drilling rig includes an outer power head 1 and an inner power head 2. The output ends of the outer power head 1 and the inner power head 2 are coaxial. The outer power head 1 is used to drive the rotation and retraction of the outer drill rod. The inner power head 2 is used to drive the rotation and retraction of the inner drill rod.

[0025] The aforementioned floating hydraulic system also includes a first floating cylinder 6 and a second floating cylinder 7; both the first floating cylinder 6 and the second floating cylinder 7 are single-piston rod type hydraulic cylinders.

[0026] The coaxial dual-power head drilling rig has an oil tank with P port and T port.

[0027] The cylinder bodies of the first floating cylinder 6 and the second floating cylinder 7 are both hinged to the external power head 1, and the piston rods of the first floating cylinder 6 and the second floating cylinder 7 are both hinged to the internal power head 2; the first floating cylinder 6 and the second floating cylinder 7 are used to drive the internal power head 2 to approach or move away from the external power head 1.

[0028] The aforementioned floating hydraulic system also includes a directional valve 8, a pressure reducing valve 9, a floating valve 11, and a hydraulic lock 12. The directional valve 8 is connected to the hydraulic oil tank of the coaxial dual-power head drilling rig. The directional valve 8 is connected to the first floating cylinder 6 and the second floating cylinder 7 via the hydraulic lock 12. The first floating cylinder 6 and the second floating cylinder 7 are connected in parallel. The extended end oil port of the first floating cylinder 6 and the extended end oil port of the second floating cylinder 7 are connected. The extended end oil port of the first floating cylinder 6 and the retracted end oil port of the second floating cylinder 7 are also connected.

[0029] The floating valve 11 is connected in parallel with the hydraulic lock 12; the hydraulic lock 12 is used to prevent hydraulic oil backflow and also to maintain pressure. The hydraulic lock 12 itself is a mature existing technology.

[0030] The pressure reducing valve 9 is connected to the oil circuit of the first floating cylinder 6 and the second floating cylinder 7. The pressure reducing valve 9 is used to reduce the oil pressure supplied to the oil tank of the drilling rig and maintain a certain oil pressure.

[0031] The pressure reducing valve 9 is connected to the floating valve 11 and the hydraulic oil tank of the coaxial dual-power head drilling rig, meaning that the hydraulic oil tank of the coaxial dual-power head drilling rig can supply oil to the pressure reducing valve 9.

[0032] Pressure reducing valve 9 is connected to the oil circuit of floating valve 11 through check valve 10; check valve 10 is used to act in one direction to prevent hydraulic oil from floating valve 11 from flowing back to pressure reducing valve 9.

[0033] The pressure value of the pressure reducing valve 9 is 2-4 MPa, preferably 2.5-3.5 MPa. More preferably, it is 3 MPa.

[0034] The reversing valve 8 is a three-position four-way solenoid reversing valve, and the reversing valve 8 has a Y-type intermediate positioner; the Y-type intermediate positioner is connected to the hydraulic lock 12 and the T-port oil circuit of the hydraulic oil tank of the coaxial dual-power head drilling rig respectively. The reversing valve 8 is used to perform reversing and anti-backflow functions. The extension and retraction of the piston rods of the first floating cylinder 6 and the second floating cylinder 7 can be realized by adjusting the on and off of the solenoid coil of the reversing valve 8.

[0035] The floating valve 11 is a two-position two-way solenoid valve; the two valve ports of the floating valve 11 are respectively connected to the oil ports of the first floating cylinder 6 and the second floating cylinder 7. When the solenoid coil of the floating valve 11 is energized, the oil ports at both ends of the floating valve 11 are connected, corresponding to the floating state.

[0036] The one-way valve 10 passes from the pressure reducing valve 9 to the first floating cylinder 6 and the second floating cylinder 7, to prevent hydraulic oil from flowing back towards the pressure reducing valve 9.

[0037] The cylinder bodies of the first floating cylinder 6 and the second floating cylinder 7 are hinged to the first connecting seats 3 on both sides of the external power head 1; the piston rods of the first floating cylinder 6 and the second floating cylinder 7 are hinged to the second connecting seats 4 on both sides of the internal power head 2; the piston rods of the first floating cylinder 6 and the second floating cylinder 7 are parallel to the output end of the external power head 1, so that the internal power head 2 can smoothly slide back and forth relative to the external power head 1.

[0038] The internal power head 2 is slidably mounted on the guide rod 5; the guide rod 5 is parallel to the piston rods of the first floating cylinder 6 and the second floating cylinder 7, and the guide rod 5 is located on both sides of the internal power head 2 to guide the movement of the internal power head 2.

[0039] The working principle of this utility model is as follows:

[0040] When it is necessary to load or unload the inner drill rod, the drilling rig's oil tank supplies hydraulic oil from port P, which reaches the reversing valve 8. The upper solenoid coil of the reversing valve 8 is energized, and the second-type side positioning machine intervenes. The hydraulic oil passes through the hydraulic lock 12 to the extension ports of the first floating cylinder 6 and the second floating cylinder 7, thereby achieving the synchronous extension of the piston rods of the first floating cylinder 6 and the second floating cylinder 7, driving the inner power head 2 to slide along the guide rod 5 until it reaches a specific position. During this process, the solenoid coil of the floating valve 11 is de-energized.

[0041] Upon reaching the designated position, the solenoid coil of directional valve 8 is de-energized, and the Y-type neutral positioner is engaged. At this point, hydraulic oil cannot return to the drilling rig's oil tank T port through directional valve 8, and hydraulic lock 12, in conjunction with pressure reducing valve 9, maintains system pressure, limiting the oil pressure to the 3MPa set by pressure reducing valve 9. Under this pressure, the probability of cooling water from the outer drill pipe entering the inner drill pipe is reduced.

[0042] In this state, the electromagnetic coil of the floating valve 11 is energized, which enables the oil ports at the extended ends of the first floating cylinder 6 and the second floating cylinder 7 to be connected with the oil ports at the retracted ends of the first floating cylinder 6 and the second floating cylinder 7, thereby achieving oil circuit connection and floating.

[0043] The above embodiments are used to further illustrate the present invention, but do not limit the present invention to these specific embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be understood as being within the protection scope of the present invention.

Claims

1. A floating hydraulic system for a coaxial dual-power head drilling rig, characterized in that: This invention relates to a coaxial dual-power head drilling rig, comprising an external power head (1) and an internal power head (2), wherein the output end of the external power head (1) is coaxial with the output end of the internal power head (2); it also includes a first floating cylinder (6) and a second floating cylinder (7); the cylinder bodies of the first floating cylinder (6) and the second floating cylinder (7) are both hinged to the external power head (1), and the piston rods of the first floating cylinder (6) and the second floating cylinder (7) are both hinged to the internal power head (2); it also includes a reversing valve (8). The system includes a pressure reducing valve (9), a floating valve (11), and a hydraulic lock (12). The directional valve (8) is connected to the hydraulic oil tank of the coaxial dual-power head drilling rig. The directional valve (8) is connected to the first floating cylinder (6) and the second floating cylinder (7) via the hydraulic lock (12). The first floating cylinder (6) and the second floating cylinder (7) are connected in parallel. The floating valve (11) is connected in parallel with the hydraulic lock (12). The pressure reducing valve (9) is connected to the first floating cylinder (6) and the second floating cylinder (7).

2. The floating hydraulic system for a coaxial dual-power head drilling rig according to claim 1, characterized in that: The pressure reducing valve (9) is connected to the floating valve (11) and the hydraulic oil tank circuit of the coaxial dual-power head drilling rig.

3. The floating hydraulic system for a coaxial dual-power head drilling rig according to claim 2, characterized in that: The pressure reducing valve (9) is connected to the floating valve (11) via a check valve (10) in an oil circuit; the pressure value of the pressure reducing valve (9) is 2-4 MPa.

4. The floating hydraulic system for a coaxial dual-power head drilling rig according to claim 3, characterized in that: The reversing valve (8) is a three-position four-way solenoid reversing valve, and the reversing valve (8) has a Y-type intermediate position machine; the Y-type intermediate position machine is connected to the hydraulic lock (12) and the T-port oil circuit of the hydraulic oil tank of the coaxial dual power head drilling machine respectively.

5. The floating hydraulic system for a coaxial dual-power head drilling rig according to claim 4, characterized in that: The floating valve (11) is a two-position two-way electromagnetic valve; the two valve ports of the floating valve (11) are respectively connected to the oil ports of the first floating cylinder (6) and the second floating cylinder (7).

6. The floating hydraulic system for a coaxial dual-power head drilling rig according to claim 3, characterized in that: The one-way valve (10) passes through the pressure reducing valve (9) from the first floating cylinder (6) and the second floating cylinder (7).

7. The floating hydraulic system for a coaxial dual-power head drilling rig according to claim 1, characterized in that: The cylinder bodies of the first floating cylinder (6) and the second floating cylinder (7) are hinged to the first connecting seats (3) on both sides of the external power head (1); the piston rods of the first floating cylinder (6) and the second floating cylinder (7) are hinged to the second connecting seats (4) on both sides of the internal power head (2); the piston rods of the first floating cylinder (6) and the second floating cylinder (7) are parallel to the output end of the external power head (1).

8. The floating hydraulic system for a coaxial dual-power head drilling rig according to claim 7, characterized in that: The internal power head (2) is slidably mounted on the guide rod (5); the guide rod (5) is parallel to the piston rods of the first floating cylinder (6) and the second floating cylinder (7).

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