A rotary drilling machine slewing control hydraulic system and rotary drilling machine

Abstract

The utility model discloses a rotary drilling rig rotary control hydraulic system and rotary drilling rig, and the hydraulic system includes pilot pump, pilot handle, reversing valve, rotary motor and speed reducer, still includes first control valve and second control valve, the speed reducer is mechanically connected with rotary motor, and rotates by rotary motor drive, and the reversing valve is connected with rotary motor and supplies oil to rotary motor, the second control valve sets up on the oil circuit of pilot handle to reversing valve, is used for independent control whether the oil liquid on pilot handle enters the pilot chamber of reversing valve. This hydraulic system, through the second control valve of adding, realizes the rotary lock function when the speed reducer is started, and the pilot oil circuit of reversing valve is cut off control, thoroughly solves the problem of the friction pad of speed reducer brake wear and tear under the rotary lock function opening because of the misoperation pilot handle, fundamentally protects the brake, prolongs its service life.

Description

Technical Field

[0001] This utility model belongs to the field of rotary drilling rig technology, specifically relating to a rotary drilling rig rotation control hydraulic system and a rotary drilling rig. Background Technology

[0002] As a highly efficient foundation construction machinery, the stability and reliability of the slewing system of a rotary drilling rig are crucial to the overall performance, construction safety, and hole quality. Existing rotary drilling rigs typically employ hydraulic braking systems, one of their core functions being slewing locking. This function primarily prevents accidental activation of the pilot handle during drilling operations, thus avoiding serious accidents such as mast collapse, protecting the equipment structure, and ensuring the verticality and accuracy of the borehole.

[0003] The principle of the existing rotary control hydraulic system is shown in the attached figure. Its basic working principle is as follows: When the operator activates the rotary locking function, the solenoid valve (02) controlling the brake is de-energized. In this state, the brake built into the reducer (07) is in a braking (locked) state, and mechanical rotation is prohibited. Conversely, when the solenoid valve (02) is energized, the brake is released (unlocked). At this time, by operating the pilot handle (01), the pilot pressure oil output by the pilot pump (09) will push the main valve core (05) to change direction through the pilot handle (01), so that the pressure oil provided by the main pump (010) enters the rotary motor (06) and drives the platform to rotate.

[0004] However, this existing technical solution has the following obvious defects and shortcomings: 1. Misoperation while the slewing lock is engaged may damage the brake: The current system's rotation locking function only achieves mechanical locking through the reducer brake, without cutting off the pilot control oil circuit to the main valve. When the rotation locking function is activated (i.e., the solenoid valve (02) is de-energized and the brake is engaged), if someone mistakenly operates the pilot handle (01), the pilot pressure oil will still act on the main valve core (05), causing the pressure oil from the main pump to enter the rotation motor (06). Since the motor output shaft is locked by the brake, the pressure oil cannot drive it to rotate, resulting in a sudden increase in system pressure. The huge torque generated by this high-pressure oil will directly act on the brake's friction pads, subjecting them to extreme stress. Long-term or frequent misoperation will accelerate abnormal wear, overheating, or even failure of the friction pads, seriously affecting the service life and reliability of the brake, and creating safety hazards for the equipment.

[0005] 2. Severe hydraulic shock occurs when the rotation stops, resulting in poor overall machine stability: At the moment the slewing motion stops, the immense inertia causes the upper platform and mast of the rotary drilling rig to sway. Existing systems lack effective buffering or pressure relief mechanisms to absorb this inertial energy. The mast's swaying, in turn, drives the rotary motor to rotate, which then operates like a pump, converting the impact energy into pressure surges (peak pressure) in the hydraulic system. These severe pressure surges not only generate unpleasant noise and vibration but also cause long-term damage to the sealing and lifespan of components such as the hydraulic pump, motor, and oil pipes, affecting the overall operational stability and working accuracy of the machine. Utility Model Content

[0006] One of the purposes of this utility model is to disclose a rotary drilling rig rotation control hydraulic system. By adding a second control valve, the pilot oil circuit of the reversing valve is cut off when the rotation locking function of the reducer is activated. This completely solves the problem of wear and tear on the brake friction plates of the reducer caused by misoperation of the pilot handle when the rotation locking function is activated, thus fundamentally protecting the brake and extending its service life.

[0007] The second objective of this utility model is to disclose a rotary drilling rig. This rotary drilling rig adopts the aforementioned rotary drilling rig rotation control hydraulic system, which prevents the rotary drilling rig from having a starting tendency due to misoperation of the pilot handle, thus extending the service life of the rotary motor.

[0008] To achieve the above objectives, this utility model discloses a rotary drilling rig rotation control hydraulic system, including a pilot pump, a pilot handle, a reversing valve, a rotary motor, and a reducer, and further including a first control valve and a second control valve; the reducer is mechanically connected to the rotary motor and is driven to rotate by the rotary motor, the reversing valve is connected to the rotary motor and supplies oil to the rotary motor; the pilot handle is connected to the reversing valve and controls the reversing valve to switch directions; The first control valve is installed in the oil line from the pilot pump to the reducer, and is used to independently control whether the oil output by the pilot pump enters the reducer; The second control valve is installed in the oil line from the pilot handle to the directional valve, and is used to independently control whether the oil on the pilot handle enters the pilot chamber of the directional valve.

[0009] As an optional implementation, the first control valve includes a first solenoid valve. When the first solenoid valve is energized, it connects the oil circuit from the pilot pump to the reducer. When the first solenoid valve is de-energized, it disconnects the oil circuit from the pilot pump to the reducer.

[0010] As an optional implementation, the second control valve includes a second solenoid valve and a third solenoid valve. The second solenoid valve is disposed in the oil line from the forward position of the pilot handle to the first pilot chamber of the directional valve, and the third solenoid valve is disposed in the oil line from the reverse position of the pilot handle to the second pilot chamber of the directional valve. When the second solenoid valve is energized, it connects the oil passage from the forward rotation position of the pilot handle to the first pilot chamber of the directional valve; when the second solenoid valve is de-energized, it cuts off the oil passage from the forward rotation position of the pilot handle to the first pilot chamber of the directional valve. When the third solenoid valve is energized, it connects the oil passage from the reverse position of the pilot handle to the second pilot chamber of the directional valve; when the third solenoid valve is de-energized, it disconnects the oil passage from the reverse position of the pilot handle to the second pilot chamber of the directional valve.

[0011] As an optional implementation, the directional control valve has a first working position and a second working position; the forward position of the pilot handle is connected to the first pilot chamber of the directional control valve, and hydraulic oil enters the first pilot chamber to drive the directional control valve to work in the first working position; the reverse position of the pilot handle is connected to the second pilot chamber of the directional control valve, and hydraulic oil enters the second pilot chamber to drive the directional control valve to work in the second working position.

[0012] As an optional implementation, the reversing valve includes a first oil inlet, a first oil return port, a first working oil port, and a second working oil port; when the reversing valve is operating in the first working position, the first oil inlet is connected to the first working oil port, and the second working oil port is connected to the first oil return port; when the reversing valve is operating in the second working position, the first oil inlet is connected to the second working oil port, and the first working oil port is connected to the first oil return port. A working pump is connected to the first oil inlet, the first oil return port is connected to the oil tank, and the first working oil port and the second working oil port are respectively connected to the forward and reverse oil ports of the rotary motor.

[0013] As an optional implementation, a first relief valve is connected in parallel to the forward rotation port of the rotary motor, and a second relief valve is connected in parallel to the reverse rotation port of the rotary motor; after the hydraulic oil supplied by the first working port of the directional valve satisfies the rotation of the rotary motor, the excess hydraulic oil drives the first relief valve to open, and returns to the oil tank in sequence through the first relief valve and the second relief valve; after the hydraulic oil supplied by the second working port of the directional valve satisfies the rotation of the rotary motor, the excess hydraulic oil drives the second relief valve to open, and returns to the oil tank in sequence through the second relief valve and the first relief valve.

[0014] As an optional implementation, the first relief valve is provided with a first pressurized oil port, which is connected to the second solenoid valve. Pilot oil from the second solenoid valve enters the first pressurized oil port to increase the pressure of the first relief valve. The second relief valve is provided with a second pressurized oil port, which is connected to the third solenoid valve. Pilot oil from the third solenoid valve enters the second pressurized oil port to increase the pressure of the second relief valve.

[0015] As an optional implementation, a hydraulic control valve is also included, which is disposed in the oil line from the first control valve to the reducer; The hydraulic control valve is a two-position two-way pilot valve, and also includes a second oil inlet and a second oil outlet. The second oil inlet is connected to the first control valve, and the second oil outlet is connected to the reducer. The hydraulic control valve further includes a first working position and a second working position. When the hydraulic control valve is operating in the first working position, the second oil inlet and the second oil outlet are connected. When the hydraulic control valve is operating in the second working position, the second oil inlet and the second oil outlet are disconnected. The hydraulic control valve further includes a third pilot chamber, into which hydraulic oil enters to drive the hydraulic control valve to operate in the first working position; the third pilot chamber is connected to the second control valve.

[0016] As an optional implementation, a first check valve and a second check valve are connected to the third pilot chamber. The first check valve connects the second solenoid valve to the oil passage of the third pilot chamber, and the second check valve connects the third solenoid valve to the oil passage of the third pilot chamber.

[0017] A rotary drilling rig, wherein the rotary drilling rig is equipped with the aforementioned rotary drilling rig rotation control hydraulic system.

[0018] Compared with the prior art, the beneficial effects of the rotary drilling rig rotation control hydraulic system of this utility model are as follows: By setting up a first control valve and a second control valve, the two independent control valves form a double insurance mechanism of "mechanical braking combined with hydraulic signal cutoff," which greatly improves the reliability and safety of the slewing locking function. This fundamentally avoids damage to the brake friction pads by high-pressure oil in case of misoperation, significantly extending the service life of the brake. It also reduces the impact on hydraulic components such as the slewing motor and main valve, lowering the equipment's failure rate and maintenance costs.

[0019] Compared with the prior art, the beneficial effects of the rotary drilling rig of this utility model are as follows: the rotary drilling rig adopts the aforementioned rotary drilling rig rotation control hydraulic system, which prevents the rotary drilling rig from having a starting tendency due to misoperation of the pilot handle, thus extending the service life of the rotary motor. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a diagram illustrating a prior art embodiment of a rotary drilling rig's rotary control hydraulic system.

[0022] Figure 2 This is an embodiment diagram of a rotary drilling rig rotation control hydraulic system according to this utility model.

[0023] Explanation of key figure labels: 1. Pilot handle; 2. First solenoid valve; 3. Third solenoid valve; 4. Second solenoid valve; 5. Directional control valve; 6. Rotary motor; 7. Reducer; 8. Hydraulic control valve; 9. Pilot pump; 10. Working pump; 11. Second control valve; 12. First control valve. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0026] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0027] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0028] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0029] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0030] Please see Figure 2 As shown in the figure, this application provides a rotary drilling rig rotation control hydraulic system.

[0031] See Figure 2 A rotary drilling rig slewing control hydraulic system includes a pilot pump 9, a pilot handle 1, a reversing valve 5, a rotary motor 6, and a reducer 7, and further includes a first control valve 12 and a second control valve 11. The reducer 7 is mechanically connected to the rotary motor 6 and is driven to rotate by the rotary motor 6. The reversing valve 5 is connected to the rotary motor 6 and supplies oil to the rotary motor 6. The pilot handle 1 is connected to the reversing valve 5 and controls the reversing of the reversing valve 5. The first control valve 12 is located in the oil line from the pilot pump 9 to the reducer 7, and is used to independently control whether the oil output from the pilot pump 9 enters the reducer 7. The second control valve 11 is located in the oil line from the pilot handle 1 to the reversing valve 5, and is used to independently control whether the oil on the pilot handle 1 enters the pilot chamber of the reversing valve 5.

[0032] See Figure 1 The diagram illustrates a prior art embodiment. In the prior art, when the rotation lock is activated, the hydraulic system for the rotation control of a rotary drilling rig only mechanically locks the brake of the reducer 7, but the pilot oil circuit remains unobstructed. Incorrect operation of the pilot handle 1 can cause high-pressure oil to enter the locked rotation motor 6, generating enormous pressure that acts on the brake friction pads, leading to abnormal wear.

[0033] See Figure 2This diagram illustrates an embodiment of the rotary drilling rig slewing control hydraulic system of this application. In this embodiment, a second control valve 11 is added, and the second control valve 11 is located on the oil circuit from the pilot handle 1 to the reversing valve 5. This valve is used to independently control whether the oil on the pilot handle 1 enters the pilot chamber of the reversing valve 5. Specifically, when slewing lock is activated, the second control valve 11 cuts off the oil circuit from the pilot handle 1 to the reversing valve 5. Even if the handle is accidentally operated, the hydraulic oil passing through the pilot handle 1 will not push the reversing valve 5 to change direction, nor will it enter the rotary motor 6 through the reversing valve 5. Therefore, the rotary motor 6 will not rotate and will no longer provide a driving force to the reducer 7, preventing the reducer 7 from rotating. This prevents damage to the brake friction plates on the reducer 7, greatly extending the service life of the brake. It also reduces the impact on hydraulic components such as the rotary motor 6 and the main valve, lowering the equipment failure rate and maintenance costs. The setting of the second control valve 11 cuts off the pilot control oil circuit, completely eliminating the possibility of generating high-pressure oil during misoperation from the source of hydraulic signals, thereby eliminating the brake wear caused by it.

[0034] In this embodiment, by setting a first control valve 12 and a second control valve 11, the opening and closing of the rotation lock function of the reducer 7 and the pilot oil circuit are controlled, forming a dual insurance mechanism of "mechanical braking combined with hydraulic signal cutoff". The dual redundancy protection mechanism makes the rotation lock function more foolproof. Even if one component fails in extreme cases, the other protection can still play a role, effectively preventing major accidents such as "mast collapse" caused by misoperation, protecting equipment and personnel safety, and enhancing operational safety and overall machine reliability.

[0035] In this embodiment, the objective is achieved simply by adding a second control valve 11. The system is simple, has low modification costs, is easy to integrate and implement on existing models, and has high practicality and economy. The system control is also simple.

[0036] In some embodiments, see Figure 2 The first control valve 12 includes a first solenoid valve 2. When the first solenoid valve 2 is energized, it connects the oil circuit from the pilot pump 9 to the reducer 7. When the first solenoid valve 2 is de-energized, it disconnects the oil circuit from the pilot pump 9 to the reducer 7. The first control valve 12 uses the first solenoid valve 2, which is controlled by switching on and off the power to control the hydraulic oil entering the reducer 7 for the rotation lock-up function. The control is simple and convenient, consistent with the original system, and simplifies the cost of upgrading the original system.

[0037] In some embodiments, see Figure 2The second control valve 11 includes a second solenoid valve 4 and a third solenoid valve 3. The second solenoid valve 4 is disposed in the oil line from the forward position of the pilot handle 1 to the first pilot chamber of the directional valve 5, and the third solenoid valve 3 is disposed in the oil line from the reverse position of the pilot handle 1 to the second pilot chamber of the directional valve 5.

[0038] When the second solenoid valve 4 is energized, it connects the oil passage from the forward rotation position of the pilot handle 1 to the first pilot chamber of the directional valve 5. When the second solenoid valve 4 is de-energized, it cuts off the oil passage from the forward rotation position of the pilot handle 1 to the first pilot chamber of the directional valve 5.

[0039] When the third solenoid valve 3 is energized, it connects the oil passage from the reverse position of the pilot handle 1 to the second pilot chamber of the directional valve 5. When the third solenoid valve 3 is de-energized, it cuts off the oil passage from the reverse position of the pilot handle 1 to the second pilot chamber of the directional valve 5.

[0040] In this embodiment, the pilot oil supply to the forward and reverse oil circuits of the rotary motor 6 is controlled by the first solenoid valve 2 and the second solenoid valve 4, respectively. After the rotary locking function of the reducer 7 is activated, the pilot oil circuits of the forward and reverse oil circuits of the rotary motor 6 are cut off by the first solenoid valve 2 and the second solenoid valve 4. At this time, even if the pilot handle 1 is accidentally operated, there is no pilot oil to drive the reversing valve 5 to switch, no oil will enter the rotary motor 6, and the rotary motor 6 will not rotate. The reducer 7 will not have a tendency to rotate. That is, the setting of the first solenoid valve 2 and the second solenoid valve 4, after the rotary locking function of the reducer 7 is activated, cuts off the pilot oil circuit of the reversing valve 5, and no longer provides a driving force to the reducer 7, so that the reducer 7 will no longer have a tendency to rotate. The brake friction plate on the reducer 7 will not be damaged, the service life of the brake is greatly extended, and the impact on hydraulic components such as the rotary motor 6 and the main valve is reduced, thereby reducing the failure rate and maintenance cost of the equipment. The installation of the first solenoid valve 2 and the second solenoid valve 4 cuts off the pilot control oil circuit, completely eliminating the possibility of generating high-pressure oil during misoperation from the source of the hydraulic signal, thereby eradicating the brake wear caused by it.

[0041] The second control valve 11 adopts the first solenoid valve 2 and the second solenoid valve 4. On the one hand, it is controlled by electrical signals, which makes control convenient and reduces the probability of misoperation. On the other hand, the use of solenoid valves simplifies the system setup, reduces the number of pipelines, and lowers the system cost.

[0042] In some embodiments, the directional control valve 5 has a first working position and a second working position; the forward (right-turn) position of the pilot handle 1 connects to the first pilot chamber of the directional control valve 5, and hydraulic oil enters the first pilot chamber to drive the directional control valve 5 to operate in the first working position; the reverse (left-turn) position of the pilot handle 1 connects to the second pilot chamber of the directional control valve 5, and hydraulic oil enters the second pilot chamber to drive the directional control valve 5 to operate in the second working position. The directional control valve 5 controls the forward and reverse rotation of the rotary motor 6 by reversing its direction. (See also...) Figure 2 The left end of the reversing valve 5 is the first working position, and the right end of the reversing valve 5 is the second working position.

[0043] See Figure 2 ,like Figure 2 As shown, the left position of directional valve 5 is the first working position, and the right position is the second working position. The left side of directional valve 5 is the first pilot chamber, and the right side is the second pilot chamber. During operation, hydraulic oil enters the first pilot chamber on the left, pushing directional valve 5 to operate in the left position (first working position). At this time, the rotary motor 6 rotates forward, i.e., to the right. Hydraulic oil enters the second pilot chamber on the right, pushing directional valve 5 to operate in the right position (second working position). At this time, the rotary motor 6 rotates in reverse, i.e., to the left.

[0044] In some embodiments, the reversing valve 5 includes a first oil inlet P, a first oil return port T, a first working oil port A, and a second working oil port B. When the reversing valve 5 operates in the first working position, the first oil inlet P is connected to the first working oil port A, and the second working oil port B is connected to the first oil return port T. When the reversing valve 5 operates in the second working position, the first oil inlet P is connected to the second working oil port B, and the first working oil port A is connected to the first oil return port T. A working pump 10 is connected to the first oil inlet P, the first oil return port T is connected to an oil tank, and the first working oil port A and the second working oil port B are respectively connected to the forward rotation port A1 and the reverse rotation port A2 of the rotary motor 6.

[0045] See Figure 2 The reversing valve 5 supplies hydraulic oil to the rotary motor 6 and also returns oil to the rotary motor 6. The first working oil port A and the second working oil port B are respectively connected to the forward rotation oil port A1 and the reverse rotation oil port A2 of the rotary motor 6, so as to drive the rotary motor 6 to rotate forward and reverse respectively.

[0046] In some embodiments, a first relief valve is connected in parallel to the forward rotation port of the rotary motor 6, and a second relief valve is connected in parallel to the reverse rotation port of the rotary motor 6. After the rotary motor 6 rotates, excess hydraulic oil supplied by the first working port of the directional valve 5 drives the first relief valve to open, and then returns to the oil tank sequentially through the first relief valve and the second relief valve. Similarly, after the rotary motor 6 rotates, excess hydraulic oil supplied by the second working port of the directional valve 5 drives the second relief valve to open, and then returns to the oil tank sequentially through the second relief valve and the first relief valve.

[0047] In this embodiment, by setting a first relief valve and a second relief valve, excess hydraulic oil is discharged to ensure the normal operation of the rotary motor 6 and to prevent excessively high oil pressure on the rotary motor 6, which could affect its normal operation. The relief valves allow more hydraulic oil to enter the rotary motor 6 when it starts driving, effectively improving the start-up response speed and suppressing hydraulic shock caused by mast swaying when the rotary motor 6 stops, thus enhancing operational stability and overall machine reliability.

[0048] In some embodiments, the first relief valve is provided with a first pressurized oil port B1, which is connected to the second solenoid valve 4. Pilot oil from the second solenoid valve 4 enters the first pressurized oil port B1, increasing the pressure at which the first relief valve is open. The second relief valve is provided with a second pressurized oil port B2, which is connected to the third solenoid valve 3. Pilot oil from the third solenoid valve 3 enters the second pressurized oil port B2, increasing the pressure at which the second relief valve is open.

[0049] By setting the first pressurized oil port B1 and the second pressurized oil port B2, the conduction pressure of the first relief valve and the second relief valve are increased respectively, requiring more hydraulic oil to open them. When the rotary motor 6 starts, the increased conduction pressure of the first or second relief valve allows more hydraulic oil to be used to drive the rotary motor 6, resulting in a faster start-up and shorter start-up time. Because of the increased conduction pressure of the first or second relief valve, it will close earlier when the rotary motor 6 stops, thus extending the time it takes for the rotary motor 6 to stop and providing a buffer, preventing a jerky stop.

[0050] In some embodiments, the rotary drilling rig rotation control hydraulic system further includes a hydraulic control valve 8, which is disposed in the oil line from the first control valve 12 to the reducer 7.

[0051] The hydraulic control valve 8 is a two-position two-way pilot valve, and also includes a second oil inlet and a second oil outlet. The second oil inlet is connected to the first control valve 12, and the second oil outlet is connected to the reducer 7.

[0052] The hydraulic control valve 8 also includes a working position one and a working position two. When the hydraulic control valve 8 is working in the working position one, the second oil inlet and the second oil outlet are connected. When the hydraulic control valve 8 is working in the working position two, the second oil inlet and the second oil outlet are cut off.

[0053] The hydraulic control valve 8 also includes a third pilot chamber, into which hydraulic oil enters to drive the hydraulic control valve 8 to operate in the first working position; the third pilot chamber is connected to the second control valve 11.

[0054] In this embodiment, by setting the hydraulic control valve 8, an additional layer of protection is provided for the oil circuit from the pilot pump 9 to the reducer 7. This ensures that even when the first control valve 12 is open, hydraulic oil will not enter the reducer 7, and the rotational locking function of the reducer 7 will not be disabled. Thus, even if a component in the system malfunctions, the system can still maintain its locking function. The combined hydraulic and electrical control further ensures the reliability of the system. In this system, the reducer 7 requires the first solenoid valve 2 and the second solenoid valve 4 to be energized simultaneously, or the first solenoid valve 2 and the third solenoid valve 3 to be energized simultaneously.

[0055] In some embodiments, a first check valve and a second check valve are connected to the third pilot chamber. The first check valve connects the second solenoid valve 4 to the oil passage of the third pilot chamber, and the second check valve connects the third solenoid valve 3 to the oil passage of the third pilot chamber. The first check valve and the second check valve respectively enable the flow of the pilot oil passages of the second solenoid valve 4 and the third solenoid valve 3, thereby controlling the pilot oil passage of the hydraulic control valve 8.

[0056] A rotary drilling rig is provided, wherein the aforementioned rotary drilling rig rotation control hydraulic system is installed. This prevents the rotary drilling rig from having a tendency to start due to accidental operation of the pilot handle 1, thereby extending the service life of the rotary motor 6.

[0057] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A rotary drilling rig rotation control hydraulic system, characterized in that, The system includes a pilot pump, a pilot handle, a reversing valve, a rotary motor, and a reducer, as well as a first control valve and a second control valve. The reducer is mechanically connected to the rotary motor and is driven to rotate by the rotary motor. The reversing valve is connected to the rotary motor and supplies oil to the rotary motor. The pilot handle is connected to the reversing valve and controls the reversing valve to switch directions. The first control valve is installed in the oil line from the pilot pump to the reducer, and is used to independently control whether the oil output by the pilot pump enters the reducer; The second control valve is installed in the oil line from the pilot handle to the directional valve, and is used to independently control whether the oil on the pilot handle enters the pilot chamber of the directional valve.

2. The rotary drilling rig rotation control hydraulic system according to claim 1, characterized in that, The first control valve includes a first solenoid valve. When the first solenoid valve is energized, it connects the oil circuit from the pilot pump to the reducer. When the first solenoid valve is de-energized, it disconnects the oil circuit from the pilot pump to the reducer.

3. The rotary drilling rig rotation control hydraulic system according to claim 1, characterized in that, The second control valve includes a second solenoid valve and a third solenoid valve. The second solenoid valve is disposed in the oil line from the forward position of the pilot handle to the first pilot chamber of the directional valve, and the third solenoid valve is disposed in the oil line from the reverse position of the pilot handle to the second pilot chamber of the directional valve. When the second solenoid valve is energized, it connects the oil passage from the forward rotation position of the pilot handle to the first pilot chamber of the directional valve; when the second solenoid valve is de-energized, it cuts off the oil passage from the forward rotation position of the pilot handle to the first pilot chamber of the directional valve. When the third solenoid valve is energized, it connects the oil passage from the reverse position of the pilot handle to the second pilot chamber of the directional valve; when the third solenoid valve is de-energized, it disconnects the oil passage from the reverse position of the pilot handle to the second pilot chamber of the directional valve.

4. The rotary drilling rig rotation control hydraulic system according to claim 3, characterized in that, The directional control valve has a first working position and a second working position; the forward position of the pilot handle is connected to the first pilot chamber of the directional control valve, and hydraulic oil enters the first pilot chamber to drive the directional control valve to work in the first working position; the reverse position of the pilot handle is connected to the second pilot chamber of the directional control valve, and hydraulic oil enters the second pilot chamber to drive the directional control valve to work in the second working position.

5. The rotary drilling rig rotation control hydraulic system according to claim 4, characterized in that, The reversing valve includes a first oil inlet, a first oil return port, a first working oil port, and a second working oil port; when the reversing valve is in the first working position, the first oil inlet is connected to the first working oil port, and the second working oil port is connected to the first oil return port; when the reversing valve is in the second working position, the first oil inlet is connected to the second working oil port, and the first working oil port is connected to the first oil return port. A working pump is connected to the first oil inlet, the first oil return port is connected to the oil tank, and the first working oil port and the second working oil port are respectively connected to the forward and reverse oil ports of the rotary motor.

6. The rotary drilling rig rotation control hydraulic system according to claim 5, characterized in that, A first relief valve is connected in parallel to the forward rotation port of the rotary motor, and a second relief valve is connected in parallel to the reverse rotation port of the rotary motor. After the hydraulic oil supplied by the first working port of the directional valve satisfies the rotation of the rotary motor, the excess hydraulic oil drives the first relief valve to open, and returns to the oil tank in sequence through the first relief valve and the second relief valve. After the hydraulic oil supplied by the second working port of the directional valve satisfies the rotation of the rotary motor, the excess hydraulic oil drives the second relief valve to open, and returns to the oil tank in sequence through the second relief valve and the first relief valve.

7. The rotary drilling rig rotation control hydraulic system according to claim 6, characterized in that, The first relief valve is provided with a first pressurized oil port, which is connected to the second solenoid valve. Pilot oil from the second solenoid valve enters the first pressurized oil port, increasing the pressure of the first relief valve. The second relief valve is provided with a second pressurized oil port, which is connected to the third solenoid valve. Pilot oil from the third solenoid valve enters the second pressurized oil port, increasing the pressure of the second relief valve.

8. The rotary drilling rig rotation control hydraulic system according to claim 3, characterized in that, It also includes a hydraulic control valve, which is installed in the oil line from the first control valve to the reducer; The hydraulic control valve is a two-position two-way pilot valve, and also includes a second oil inlet and a second oil outlet. The second oil inlet is connected to the first control valve, and the second oil outlet is connected to the reducer. The hydraulic control valve further includes a first working position and a second working position. When the hydraulic control valve is operating in the first working position, the second oil inlet and the second oil outlet are connected. When the hydraulic control valve is operating in the second working position, the second oil inlet and the second oil outlet are disconnected. The hydraulic control valve further includes a third pilot chamber, into which hydraulic oil enters to drive the hydraulic control valve to operate in the first working position; the third pilot chamber is connected to the second control valve.

9. The rotary drilling rig rotation control hydraulic system according to claim 8, characterized in that, The third pilot chamber is connected to a first check valve and a second check valve. The first check valve connects the second solenoid valve to the oil passage of the third pilot chamber, and the second check valve connects the third solenoid valve to the oil passage of the third pilot chamber.

10. A rotary drilling rig, characterized in that, The rotary drilling rig is equipped with the rotary drilling rig rotation control hydraulic system as described in any one of claims 1 to 9.

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