Gear shifting cooling system and method for double-speed reducer of rotary drilling rig

Abstract

The application provides a rotary drilling rig double-speed reducer gear shifting cooling system and method, which comprises a double-speed reducer gear shifting oil circuit and a double-speed reducer cooling oil circuit. The double-speed reducer gear shifting oil circuit comprises a sequence valve group and a gear shifting valve group; the double-speed reducer cooling oil circuit comprises a flow valve group; when the two-position three-way valve is powered, the oil port C1 is connected to the oil port C3, the oil port E is connected to the oil port A1 initially, and when the pressure at the gear shifting oil port U1 reaches the spring setting pressure in the sequence valve group, the sequence valve group is opened internally, and the oil port E is connected to the oil port A2, so as to realize the gear shifting of the speed state of the reducer. The application can quickly complete gear shifting under the specified gear shifting pressure, the cooling flow of the reducer is not affected by pressure fluctuation, and the cooling system of the reducer has good heat dissipation performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of engineering machinery, and particularly relates to a rotary drilling rig double-speed reducer gear shifting cooling system and method. BACKGROUND

[0002] The rotary drilling rig is a large pile driving equipment suitable for hole forming operation in infrastructure engineering, and has the advantages of good hole forming quality and high efficiency. The whole construction process of the rotary drilling rig includes: hole alignment by rotation, drill rod lowering, pressure drilling, reverse rotation for lifting the drill rod, and soil throwing by rotation. Soil throwing is an indispensable process in the construction of the rotary drilling rig, and its efficiency has become a key factor affecting the construction efficiency of the rotary drilling rig. At present, the rotary drilling rig uses a double-speed reducer to realize high-speed rotation of the power head, and the inertia generated by high speed is used to throw away the soil in the drill rod, so that the soil throwing efficiency is high and the rotary drilling rig is widely favored by foreign customers.

[0003] In the prior art, the rotary drilling rig has the following defects: 1) The double-speed reducer needs to be connected with an external cooling oil circuit to cool the reducer by hydraulic oil. At present, the cooling hydraulic oil flow of the general reducer is controlled by a throttle valve, and the cooling flow is easily affected by pressure fluctuation, and the oil pressure cannot always meet the design requirements of the reducer. 2) When the reducer switches to the high-speed mode, the closure of the friction plate inside the reducer must be quickly realized, and the pressure must meet the design requirements of the reducer. If the gear shifting pressure of the reducer is set too low or too high, the friction plate of the reducer will be damaged. SUMMARY

[0004] The purpose of the present application is to provide a rotary drilling rig double-speed reducer gear shifting cooling system and method, which can quickly complete gear shifting at a specified gear shifting pressure, the cooling flow of the reducer is not affected by pressure fluctuation, and the cooling system of the reducer has good heat dissipation performance. In order to achieve the above purpose, the present application adopts the following technical solutions:

[0005] A rotary drilling rig double-speed reducer gear shifting cooling system, comprising:

[0006] The double-speed reducer 6 comprises a gear shifting oil port U1, a gear shifting oil port U2, an oil port B1, an oil port B2, an oil port T1, and an oil port T2;

[0007] The double-speed reducer gear shifting oil circuit is used for switching the high-low speed ratio of the reducer, and comprises a sequence valve group 8 and a gear shifting valve group 9;

[0008] The sequence valve group 8 comprises an oil port E, an oil port A1, and an oil port A2; the oil port A1 is connected with the gear shifting oil port U1; and the oil port A2 is connected with the gear shifting oil port U2;

[0009] The gear shifting valve group 9 comprises a two-position three-way valve 901 and an accumulator 903; the two-position three-way valve 901 comprises an oil port C1, an oil port C2, and an oil port C3;

[0010] The oil port C1 is connected with the output end of the gear pump II 3 and the accumulator 903 respectively; the oil port C3 is connected with the oil port E of the sequence valve group 8; the oil port C2 is connected with the first oil tank;

[0011] When the two-position three-way valve 901 loses power, the oil port C2 is connected with the oil port C3, and the oil port E is connected with the first oil tank.

[0012] When the two-position three-way valve 901 obtains power, the oil port C1 is connected with the oil port C3, and initially, the oil port E is connected with the oil port A1. When the pressure at the shift oil port U1 reaches the spring setting pressure in the sequence valve group 8, the sequence valve group 8 is opened internally, and the oil port E is connected with the oil port A2, so as to realize the switching of the high-low speed ratio of the speed reducer.

[0013] The cooling oil circuit of the double-speed speed reducer comprises a flow valve group 5, the flow valve group 5 is a flow compensation valve group, the inlet thereof is connected with the output end of the gear pump I 2, and the two outlets thereof are connected with the oil port B1 and the oil port B2 respectively. The oil in the double-speed speed reducer 6 flows back to the second oil tank through the oil port T1 and the oil port T2, so as to complete the lubrication and cooling of the double-speed speed reducer 6.

[0014] Preferably, the sequence valve group 8 comprises a two-position two-way valve 801 and a first one-way valve 802; the two-position two-way valve 801 comprises an oil port a, an oil port b, a pilot oil port and a drain oil port Dr.

[0015] The oil port A1 is connected with the oil port E simultaneously; the drain oil port Dr is connected to the first oil tank.

[0016] The first one-way valve 802 is conducted in the direction from the oil port A2 to the first oil tank.

[0017] The output end of the first one-way valve 802 is connected to the oil port a and the oil port E; the input end of the first one-way valve 802 is connected to the oil port b.

[0018] After the two-position two-way valve 801 is internally opened under the action of the pilot oil port pressure, the oil port a is connected with the oil port b; the oil at the oil port E enters the shift oil port U2 through the oil port a, the oil port b and the oil port A2.

[0019] Preferably, the shift valve group 9 further comprises an overflow valve 902, which is arranged between the first oil tank and the oil port C1.

[0020] Preferably, the flow valve group 5 comprises:

[0021] A first flow control valve 501 and a second flow control valve 502, the first flow control valve 501 is arranged between the gear pump I 2 and the oil port B2 of the double-speed speed reducer 6, and the second flow control valve 502 is arranged between the gear pump I 2 and the oil port B1 of the double-speed speed reducer 6.

[0022] The first one-way valve 503 and the second one-way valve 504 have an opening pressure of 2 bar to ensure that the flushing oil pressure of the double-speed reducer 6 does not exceed 2 bar; the output end of the first one-way valve 503 and the output end of the second one-way valve 504 are connected to the second oil tank; the input end of the first one-way valve 503 is connected to the output end of the first flow control valve 501; and the output end of the second one-way valve 504 is connected to the output end of the second flow control valve 502.

[0023] The first flow control valve 501 and the second flow control valve 502 are both flow compensation valves.

[0024] Preferably, the gear pump I 2 is driven by the engine 1; and the gear pump II 3 is connected in series with the gear pump I 2.

[0025] The application also discloses a gear shifting cooling method for the double-speed reducer of the rotary drilling rig.

[0026] When the double-speed reducer 6 works in a low-speed state formed by a high-speed ratio, the gear shifting oil ports U1 and U2 of the double-speed reducer 6 do not need to be controlled by oil, and at this time, the gear shifting valve group 9 is in a power-off state.

[0027] When the double-speed reducer 6 needs to work in a high-speed state formed by a low-speed ratio, an operator presses a high-speed soil throwing button in a power head of a cab, and after a key signal is received by a controller, the gear shifting valve group 9 is powered on.

[0028] Then, the oil output by the gear pump II 3 enters the oil port E of the sequence valve 8 through the gear shifting valve group 9, and the oil enters the gear shifting oil port U1 of the double-speed reducer 6 from the oil port E through the oil port A1.

[0029] When the pressure at the gear shifting oil port U1 reaches the spring setting pressure 15 bar in the sequence valve group 8, the two-position two-way valve 801 is opened, the oil enters the gear shifting oil port U2 from the oil port E through the oil port A2, and the action switching of the reducer from the low speed to the high speed is completed.

[0030] Preferably, the application further comprises:

[0031] When the engine of the rotary drilling rig is started, the double-speed reducer cooling oil circuit starts to work, the flow output by the gear pump I 2 enters the oil ports B1 and B2 of the double-speed reducer 6 through the flow valve group 5, and then flows back to the second oil tank through the oil ports T1 and T2 of the double-speed reducer 6, so that the lubrication and cooling of the double-speed reducer 6 are completed.

[0032] Preferably, when the gear shifting valve group 9 is in a power-off state, the oil in the cavity of the double-speed reducer 6 flows back to the first oil tank through the gear shifting oil ports U1 and U1 in sequence through the oil ports E, C3 and C2.

[0033] Compared with the prior art, the application has the following advantages:

[0034] (1) The shift pressure (overflow valve) of the double-speed reducer shift oil way is controlled in the range of 25~28bar, and the double-speed reducer fast shift is realized, and the switching of the high-speed action of the power head is completed. Specifically, when the double-speed reducer needs to work in the high-speed state formed by the second rotating speed, the operator presses the high-speed soil throwing button of the power head in the cab, and the controller receives the key signal to control the shift valve group to be powered. Then the oil output by the gear pump II enters the oil port E of the sequence valve after the shift valve group, and the oil enters the shift oil port U1 of the double-speed reducer from the oil port E through the oil port A1. When the pressure at the shift oil port U1 reaches the spring setting pressure 15bar in the sequence valve group, the two-position two-way valve 801 is opened, and the oil enters the shift oil port U2 from the oil port E through the oil port A2, and the action switching of the reducer from low speed to high speed is completed.

[0035] (2) The flow compensation valve is used to control the flow of the double-speed reducer so that it is not affected by pressure fluctuation, and the check valve is added to make the cooling pressure meet the requirements of the reducer. The cooling oil way can accurately control the flow and pressure of the hydraulic oil entering the reducer, and ensure that the maximum working temperature of the reducer does not exceed 90℃. Specifically, when the rotary drilling rig starts the engine, the double-speed reducer cooling oil way starts to work, and the flow output by the gear pump I enters the oil port B1 and B2 of the double-speed reducer through the flow valve group, and then flows back to the second oil tank through the oil port T1 and T2 of the double-speed reducer, thereby completing the lubrication and cooling of the double-speed reducer. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a hydraulic system schematic diagram of the double-speed reducer shift cooling system of the rotary drilling rig.

[0037] Among them, 1-engine, 2-gear pump I, 3-gear pump II, 4-oil tank, 5-flow valve group, 501-first flow control valve, 502-second flow control valve, 503-first check valve, 504-second check valve, 6-double-speed reducer, 7-motor, 8-sequence valve group, 801-two-position two-way valve, 802-first check valve, 9-shift valve group, 901-two-position three-way valve, 902-overflow valve, 903-accumulator. EMBODIMENT

[0038] The double-speed reducer shift cooling system and method of the rotary drilling rig of the present application will be described in more detail below in conjunction with the schematic diagram, in which the preferred embodiment of the present application is shown, and it should be understood that those skilled in the art can modify the present application described herein while still achieving the advantageous effects of the present application. Therefore, the following description should be understood as extensive knowledge for those skilled in the art, and not as a limitation on the present application.

[0039] As Figure 1As shown, a rotary drilling rig double-speed reducer gear shifting cooling system comprises:

[0040] The double-speed reducer 6 comprises gear shifting oil port U1, gear shifting oil port U2, oil port B1, oil port B2, oil port T1 and oil port T2. The motor 7 is connected with the double-speed reducer 6.

[0041] The double-speed reducer gear shifting oil circuit is used for switching the high-low speed ratio of the reducer, and comprises a sequence valve group 8 and a gear shifting valve group 9.

[0042] The sequence valve group 8 comprises oil port E, oil port A1 and oil port A2; the oil port A1 is connected with the gear shifting oil port U1; and the oil port A2 is connected with the gear shifting oil port U2.

[0043] The gear shifting valve group 9 comprises a two-position three-way valve 901, an overflow valve 902 and an accumulator 903.

[0044] The two-position three-way valve 901 is used for controlling the gear shifting of the double-speed reducer 6, and the overflow valve 902 is used for ensuring that the gear shifting pressure of the double-speed reducer 6 is within the range of 25-28 bar.

[0045] The accumulator 903 is used as a hydraulic oil storage device, and can provide sufficient oil for the gear shifting of the reducer at the moment when the gear shifting valve group 9 is opened, so as to ensure that the gear shifting of the reducer is completed within a very short time. Specifically, when the two-position three-way valve 901 loses power, the oil input to the oil port C2 from the gear pump II 3 is stored in the accumulator 903, so that the accumulator 903 can provide sufficient oil for the gear shifting of the reducer at the moment when the gear shifting valve group 9 is opened.

[0046] The two-position three-way valve 901 comprises oil port C1, oil port C2 and oil port C3.

[0047] The oil port C1 is connected with the output end of the gear pump II 3 and the accumulator 903 respectively; the oil port C3 is connected with the oil port E of the sequence valve group 8; and the oil port C2 is connected with the first oil tank.

[0048] The overflow valve 902 is arranged between the first oil tank and the oil port C1.

[0049] When the two-position three-way valve 901 loses power, the oil port C2 is connected with the oil port C3, and the oil port E is connected with the first oil tank through the oil port C3 and the oil port C2. The oil in the cavity of the double-speed reducer 6 flows back to the first oil tank through the gear shifting oil port U1, the gear shifting oil port U2, the oil port E, the oil port C3 and the oil port C2 in sequence.

[0050] When the two-position three-way valve 901 obtains power, the oil port C1 is connected with the oil port C3, the oil port C1 is not connected, initially, the oil port E is connected with the oil port A1, and when the pressure at the gear shifting oil port U1 reaches the spring setting pressure in the sequence valve group 8, the inside of the sequence valve group 8 is opened, the oil port E is connected with the oil port A2, so as to realize the switching of the speed state of the reducer.

[0051] The cooling oil circuit of the double-speed reducer comprises a flow valve group 5, the flow valve group 5 is a flow compensation valve group, the flow control valve is a pressure compensation valve, and the output flow of the flow control valve is not affected by load pressure fluctuation.

[0052] The oil inlet of the flow valve group 5 is connected with the output end of the gear pump 2, and the two oil outlets are respectively connected with the oil port B1 and the oil port B2; the oil in the double-speed reducer 6 is returned to the second oil tank through the oil port T1 and the oil port T2, so as to complete lubrication and cooling of the double-speed reducer 6.

[0053] Specifically, the sequence valve group 8 comprises a two-position two-way valve 801 and a first one-way valve 802; the two-position two-way valve 801 comprises an oil port a, an oil port b, a pilot oil port and a drain oil port Dr. The two-position two-way valve 801 is spring set at a pressure of 15 bar.

[0054] The pilot oil port and the oil port A1 are simultaneously connected with the oil port E; the drain oil port Dr is connected to the first oil tank.

[0055] The first one-way valve 802 is conducted in a direction from the oil port A2 to the first oil tank.

[0056] The output end of the first one-way valve 802 is connected to the oil port a and the oil port E; the input end of the first one-way valve 802 is connected to the oil port b.

[0057] After the two-position two-way valve 801 is internally opened under the action of the pilot oil port pressure, the oil port a is connected with the oil port b; the oil at the oil port E enters the gear shifting oil port U2 through the oil port a, the oil port b and the oil port A2.

[0058] When there is control oil (oil) at the oil port E, the control oil first enters the double-speed reducer gear shifting oil port U1 through the E-A1 oil channel; when the pressure of the E-A1 oil channel reaches the spring set pressure 15 bar of the two-position two-way valve 801, the two-position two-way valve 801 is opened, and the oil enters the gear shifting oil port U2 through the E-A2 oil channel.

[0059] The flow valve group 5 comprises a first flow control valve 501 and a second flow control valve 502.

[0060] The first flow control valve 501 is arranged between the gear pump 2 and the oil port B2 of the double-speed reducer 6, and the second flow control valve 502 is arranged between the gear pump 2 and the oil port B1 of the double-speed reducer 6.

[0061] The first one-way valve 503 and the second one-way valve 504 have an opening pressure of 2 bar to ensure that the flushing oil pressure of the double-speed reducer 6 does not exceed 2 bar; the output end of the first one-way valve 503 and the output end of the second one-way valve 504 are connected to the second oil tank; the input end of the first one-way valve 503 is connected to the output end of the first flow control valve 501; and the output end of the second one-way valve 504 is connected to the output end of the second flow control valve 502.

[0062] The first flow control valve 501 and the second flow control valve 502 are both flow compensation valves. The first flow control valve 501 is set to have an output flow of 9 L / min in a working state, and the second flow control valve 502 is set to have an output flow of 1 L / min in a working state.

[0063] The gear pump I 2 is driven by the engine 1; and the gear pump II 3 is connected in series with the gear pump I 2.

[0064] The working principle of the gear shift cooling system of the double-speed reducer of the rotary drilling rig is as follows:

[0065] When the double-speed reducer 6 works in a low-speed state formed by the first rotational speed (high-speed ratio), the gear shift oil ports U1 and U2 of the double-speed reducer 6 do not need control oil, and the gear shift valve group 9 is in a power-off state. At this time, the oil flows back to the first oil tank through the oil port C3, the oil port C2, and finally the oil port C1.

[0066] When the double-speed reducer 6 needs to work in a high-speed state formed by the second rotational speed (low-speed ratio), the operator presses the high-speed soil throwing button of the power head in the cab, and the controller receives the key signal and controls the gear shift valve group 9 to be powered on.

[0067] Then, the oil output by the gear pump II 3 enters the oil port E of the sequence valve 8 through the gear shift valve group 9, and the oil enters the gear shift oil port U1 of the double-speed reducer 6 through the oil port E, the oil port A1, and the oil port B1.

[0068] When the pressure at the gear shift oil port U1 reaches the spring set pressure of 15 bar in the sequence valve group 8, the two-position two-way valve 801 is opened, and the oil enters the gear shift oil port U2 through the oil port E, the oil port a, the oil port b, and the oil port A2, thereby completing the switching of the high-speed ratio and the low-speed ratio of the reducer.

[0069] When the rotary drilling rig starts the engine, the double-speed reducer cooling oil circuit starts to work, the flow output by the gear pump I 2 enters the oil ports B1 and B2 of the double-speed reducer 6 through the flow valve group 5, and then flows back to the second oil tank through the oil ports T1 and T2 of the double-speed reducer 6, thereby completing the lubrication and cooling of the double-speed reducer 6.

[0070] The above merely describes the preferred embodiments of the present application and does not limit the present application in any way. Any person skilled in the art can make any form of equivalent replacement or modification to the technical solutions and technical contents disclosed by the present application without departing from the scope of the technical solutions of the present application, and such changes still belong to the protection scope of the present application.

Claims

1. A dual-speed reducer shifting and cooling system for a rotary drilling rig, characterized in that, include: The dual-speed reducer (6) includes shift oil port U1, shift oil port U2, oil port B1, oil port B2, oil port T1, and oil port T2; The dual-speed reducer shifting oil circuit is used for switching the high and low speed ratios of the reducer, including a sequence valve group (8) and a shifting valve group (9). The sequence valve assembly (8) includes port E, port A1 and port A2; port A1 is connected to shift port U1; port A2 is connected to shift port U2; The shift valve assembly (9) includes a two-position three-way valve (901) and an accumulator (903); the two-position three-way valve (901) includes port C1, port C2 and port C3; The oil port C1 is connected to the output end of the gear pump II (3) and the accumulator (903) respectively; the oil port C3 is connected to the oil port E of the sequence valve group (8); the oil port C2 is connected to the first oil tank; When the two-position three-way valve (901) is de-energized, oil port C2 is connected to oil port C3, and oil port E is connected to the first oil tank; When the two-position three-way valve (901) is energized, oil port C1 is connected to oil port C3. Initially, oil port E is connected to oil port A1. When the pressure at the shift oil port U1 reaches the spring set pressure in the sequence valve group (8), the sequence valve group (8) opens, and oil port E is connected to oil port A2 to realize the high and low speed ratio switching of the reducer. The cooling oil circuit of the dual-speed reducer includes a flow valve group (5), which is a flow compensation valve group. Its oil inlet is connected to the output end of the gear pump I (2), and its two oil outlets are respectively connected to oil port B1 and oil port B2. The oil in the dual-speed reducer (6) flows back to the second oil tank through oil port T1 and oil port T2 to complete the lubrication and cooling of the dual-speed reducer (6).

2. The dual-speed reducer shifting and cooling system for rotary drilling rigs according to claim 1, characterized in that, The sequence valve Group (8) includes a two-position two-way valve (801) and a first check valve (802); the two-position two-way valve (801) includes port a, port b, pilot port and drain port Dr; The oil port A1 is connected to both oil port E and the drain port Dr is connected to the first oil tank. The first check valve (802) is open from oil port A2 to the first oil tank in the direction of flow; The output end of the first check valve (802) is connected to oil port a and oil port E; the input end of the first check valve (802) is connected to oil port b; After the two-position two-way valve (801) is internally opened under the action of the pilot port pressure, port a is connected to port b; the oil at port E enters the shift port U2 through port a, port b, and port A2.

3. The dual-speed reducer shifting and cooling system for rotary drilling rigs according to claim 1, characterized in that, The shift valve Group (9) also includes an overflow valve (902) disposed between the first oil tank and the oil port C1.

4. The dual-speed reducer shifting and cooling system for rotary drilling rigs according to claim 1, characterized in that, The flow valve Group (5) includes: A first flow control valve (501) and a second flow control valve (502), wherein the first flow control valve (501) is located between the oil port B2 of the gear pump I (2) and the dual-speed reducer (6), and the second flow control valve (502) is located between the oil port B1 of the gear pump I (2) and the dual-speed reducer (6); The first check valve (503) and the second check valve (504) have an opening pressure of 2 bar to ensure that the flushing oil inlet pressure of the dual-speed reducer (6) does not exceed 2 bar; the output ends of the first check valve (503) and the second check valve (504) are both connected to the second oil tank; the input end of the first check valve (503) is connected to the output end of the first flow control valve (501); the output end of the second check valve (504) is connected to the output end of the second flow control valve (502); Both the first flow control valve (501) and the second flow control valve (502) are flow compensation valves.

5. The dual-speed reducer shifting and cooling system for rotary drilling rigs according to claim 1, characterized in that, The gear pump I (2) is driven by engine (1); gear pump II (3) is connected in series with gear pump I (2).

6. A method for cooling the shifting gears of a dual-speed reducer in a rotary drilling rig, used in the dual-speed reducer shifting cooling system of the rotary drilling rig as described in any one of claims 1-5, characterized in that, include: When the dual-speed reducer (6) operates at a low speed state formed by the high speed ratio, the shift port U1 of the dual-speed reducer (6) U2 does not require control oil, and at this time the shift valve assembly (9) is in a de-energized state; When the dual-speed reducer (6) needs to operate at a high speed due to a low speed ratio, the operator presses the button in the cab. When the high-speed soil-throwing button is pressed, the controller receives the button signal and controls the shift valve group (9) to be energized. Afterwards, the oil output by gear pump II (3) enters the oil port E of the sequence valve group (8) through the shift valve group (9), and the oil enters the shift oil port U1 of the dual speed reducer (6) through the oil port E and the oil port A1. When the pressure at the shift port U1 reaches the spring set pressure of 15 bar in the sequence valve group (8), the two-position two-way valve (801) opens, and the oil enters the shift port U2 through the oil port E and the oil port A2, completing the switching of the reducer from low speed to high speed.

7. The method for cooling the dual-speed reducer of a rotary drilling rig according to claim 6, characterized in that, Also includes: When the rotary drilling rig starts its engine, the cooling oil circuit of the dual-speed reducer begins to work, and the flow rate output by gear pump I (2) is transferred through the flow... The flow valve assembly (5) enters the oil port B1 and oil port B2 of the dual-speed reducer (6), and then flows back to the second oil tank through the oil port T1 and oil port T2 of the dual-speed reducer (6), thereby completing the lubrication and cooling of the dual-speed reducer (6).

8. The method for cooling the dual-speed reducer of a rotary drilling rig according to claim 6, characterized in that, When the shift valve assembly (9) is de-energized, the oil in the chamber of the dual-speed reducer (6) flows back to the first oil tank through shift port U1, shift port U1, port E, port C3, and port C2 in sequence.

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