Rotary drilling rig, and mast erection method for rotary drilling rig

Abstract

Disclosed are a rotary drilling rig, and a mast erection method for a rotary drilling rig. The rotary drilling rig comprises a body (11), a mast (13), a connector (15), a mast cylinder (17), a movable arm (19), a connecting arm (21) and a support rod (23), wherein the mast comprises a lower mast (131) and a middle mast (133); the connector is hinged to each of the middle mast, the mast cylinder, the movable arm, the connecting arm and the support rod; the mast cylinder is also hinged to the middle mast; the movable arm and the connecting arm are each hinged to the body; and the support rod is also hinged to the lower mast. The rotary drilling rig is configured such that the mast cylinder is fully extended when the middle mast is attached to the lower mast. Since the mast cylinder is fully extended when the middle mast is attached to the lower mast, even if a handle is further operated, the mast cylinder itself performs pressure holding limiting, and no impact will be exerted on the support rod, thereby protecting the support rod and preventing potential safety hazards caused by the breakage of the support rod.

Description

Rotary drilling rigs and methods for erecting masts for rotary drilling rigs Technical Field

[0001] This application relates to the field of foundation construction technology, and in particular to a rotary drilling rig and a method for erecting a mast for a rotary drilling rig. Background Technology

[0002] Rotary drilling rigs are construction machines suitable for hole-forming operations in building foundation engineering. They are mainly suitable for construction in soil layers such as sand, cohesive soil, and silty soil. They are widely used in various foundation constructions such as cast-in-place piles, continuous walls, and foundation reinforcement. They generally adopt hydraulic crawler telescopic chassis, self-lifting foldable drill mast, telescopic drill rod, and are equipped with automatic vertical detection and adjustment, digital display of hole depth, etc. Technical issues

[0003] When a rotary drilling rig is moved, the mast is usually lowered to the position shown in Figure 1 for easy transport. After the move, when work is required, the mast needs to be converted to the upright position shown in Figure 2. This requires raising the middle mast 91 and aligning it with the lower mast 92 before bolting. However, the alignment of the middle mast 91 and lower mast 92 is difficult for the operator to control. It is easy for the handle to fail to return to the neutral position immediately after the mast 91 and lower mast 92 are aligned, causing the mast cylinder 93 to continue extending and resulting in the bending and deformation of the support rod 94. Currently, the only solution to the problem of the support rod 94's easy bending and deformation is to increase its strength. However, the support rod 94 still carries the risk of breakage, and a stronger support rod 94 would have a greater damaging force upon breakage, potentially causing a greater safety hazard. Technical solutions

[0004] In view of this, the purpose of this application is to provide a rotary drilling rig and a method for erecting a rotary drilling rig mast that can protect the support rod from safety hazards caused by the breakage of the support rod.

[0005] To achieve the above objectives, this application provides a rotary drilling rig, including a body, a mast, a connecting body, a mast cylinder, a boom, a connecting arm, and a support rod. The mast includes a lower mast and a middle mast. The connecting body is respectively hinged to the middle mast, the mast cylinder, the boom, the connecting arm, and the support rod. The mast cylinder is also hinged to the middle mast. The boom and the connecting arm are respectively hinged to the body. The support rod is also hinged to the lower mast. The rotary drilling rig is configured such that the mast cylinder is fully extended when the middle mast and the lower mast are in contact.

[0006] Optionally, the rotary drilling rig is configured such that the lower mast tilts forward by a preset angle A when the rotary drilling rig tilts back, and the tilt angle of the middle mast is consistent with the preset angle A when the mast cylinder is fully extended.

[0007] Optionally, the length of the support rod is designed such that the lower mast tilts forward by the preset angle A when the rotary drilling rig lowers its mast.

[0008] Optionally, the rotary drilling rig further includes an interactive device, which is equipped with a support rod protection switch for turning the support rod protection function on or off.

[0009] This application also provides a method for erecting a mast on a rotary drilling rig, for erecting a mast on the aforementioned rotary drilling rig, the method comprising:

[0010] Control the mast cylinder to extend until the mast cylinder is fully extended;

[0011] Continue applying the force that extends the mast cylinder, so that the bottom end face of the middle mast is in contact with the top end face of the lower mast;

[0012] The middle mast is fixedly connected to the lower mast.

[0013] Optionally, the lower mast tilts forward by a preset angle A when the rotary drilling rig lowers its mast, and the middle mast tilts forward by the preset angle A when the mast cylinder is fully extended. In the step of controlling the extension of the mast cylinder until the mast cylinder is fully extended, when the mast cylinder drives the middle mast to rotate to vertical, the flow rate of the pressurized oil supplied to the mast cylinder is reduced.

[0014] Optionally, the rotary drilling rig further includes an auxiliary pump and an auxiliary valve. The auxiliary pump supplies pressurized oil to the mast cylinder through the auxiliary valve to drive the mast cylinder to work. When the flow rate of the pressurized oil supplied to the mast cylinder decreases, the state of the auxiliary valve is switched to reduce the valve core opening of the auxiliary valve.

[0015] Optionally, the rotary drilling rig further includes an auxiliary pump and an auxiliary valve. The auxiliary pump supplies pressurized oil to the mast cylinder through the auxiliary valve to drive the mast cylinder to work. During the mast erection process, the pressure of the auxiliary pump is acquired. When the pressure of the auxiliary pump reaches a preset pressure, the system controls the supply of pressurized oil to the mast cylinder to be stopped.

[0016] Optionally, when pressure oil is not supplied to the mast cylinder, the state of the auxiliary valve is switched to close the auxiliary valve.

[0017] Optionally, the method for erecting a mast for a rotary drilling rig further includes a step prior to the step of controlling the extension of the mast cylinder until the mast cylinder is fully extended:

[0018] Activate the support rod protection function;

[0019] The support rod protection function includes: during the step of controlling the mast cylinder to extend until the mast cylinder is fully extended, when the mast cylinder drives the middle mast to rotate to vertical, controlling the flow rate of pressurized oil supplied to the mast cylinder to decrease; and / or, the rotary drilling rig also includes an auxiliary pump that supplies pressurized oil to the mast cylinder, and during the mast erection process, when the pressure of the auxiliary pump reaches a preset pressure, controlling the auxiliary pump not to supply pressurized oil to the mast cylinder. Beneficial effects

[0020] As described above, in the rotary drilling rig and the method for erecting a rotary drilling rig mast of this application, since the mast cylinder is fully extended when the middle mast and the lower mast are in contact, even if the handle is continued to be operated, the mast cylinder itself will be pressure-limited and will not impact the support rod, thereby protecting the support rod and avoiding the safety hazard caused by the breakage of the support rod. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 shows the state of a rotary drilling rig when the mast is tilted.

[0023] Figure 2 shows the state of the rotary drilling rig shown in Figure 1 when the mast is erected.

[0024] Figure 3 is a schematic diagram of the structure of a rotary drilling rig provided in an embodiment of this application.

[0025] Figure 4 is a schematic diagram of the working principle of the mast cylinder of the rotary drilling rig shown in Figure 3.

[0026] Figure 5 is a flowchart illustrating the control method of a rotary drilling rig provided in an embodiment of this application. Embodiments of the present invention

[0027] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of them. Based on the description of this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0028] In the description of this application, unless otherwise expressly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms based on the specific circumstances.

[0029] The terms “first,” “second,” “third,” etc., are used merely to distinguish numerical values ​​or elements with similar properties, rather than to indicate or imply relative importance or a specific order.

[0030] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0031] Referring to Figure 3, a rotary drilling rig according to an embodiment of this application includes a body 11, a mast 13, a connecting body 15, a mast cylinder 17, a boom 19, a connecting arm 21, and a support rod 23. The mast 13 includes a lower mast 131 and a middle mast 133. The connecting body 15 is hinged to the middle mast 133, the mast cylinder 17, the boom 19, the connecting arm 21, and the support rod 23, respectively. The mast cylinder 17 is also hinged to the middle mast 133. The boom 19 and the connecting arm 21 are respectively hinged to the body 11, and the support rod 23 is also hinged to the lower mast 131. The rotary drilling rig is configured such that the mast cylinder 17 is fully extended when the middle mast 133 and the lower mast 131 are in contact.

[0032] In the rotary drilling rig of this embodiment, when the middle mast 133 and the lower mast 131 are in contact, the mast cylinder 17 is fully extended. At this time, even if the handle is continued to be operated, the mast cylinder itself will be pressure-limited and will not impact the support rod, so as to protect the support rod and avoid the safety hazard caused by the breakage of the support rod.

[0033] In this embodiment, the rotary drilling rig is configured such that the lower mast 131 tilts forward by a preset angle A when the rotary drilling rig tilts back, and the tilt angle of the middle mast 133 is consistent with the preset angle A when the mast cylinder 17 is fully extended. Typically, rotary drilling rig design specifications require the mast 13 to tilt forward at a certain angle, meaning the mast 13 is tilted forward at a certain angle when the mast cylinder 17 is fully extended. Of course, if tilting forward is not required when the mast cylinder 17 is fully extended, the middle mast 133 and the lower mast 131 can also be in a vertical state when they are in contact, as long as the mast cylinder 17 is fully extended when the middle mast 133 and the lower mast 131 are in contact, it can effectively protect the support rod 23.

[0034] In this embodiment, the length of the support rod 23 is adjusted so that the lower mast 131 tilts forward by a preset angle when the rotary drilling rig tilts down. It can be understood that the connection position between the support rod 23 and the connecting body 15 and the lower mast 131 can also be adjusted so that the lower mast 131 tilts forward by a preset angle when the rotary drilling rig tilts down.

[0035] In this embodiment, the preset angle A of the forward tilt of the lower mast 131 during mast-down can be 5°. It can be understood that the preset angle A can also be other angles such as 3°, 4°, 6°, etc.

[0036] In this embodiment, referring to Figure 4, the rotary drilling rig also includes a first main pump 31, a second main pump 32, an auxiliary pump 33, a first main valve 34, a second main valve 35, and an auxiliary valve 36. The first main pump 31 and the second main pump 32 supply pressurized oil to actuators such as the travel motor, main winch motor, power head motor, and auxiliary winch motor through the first main valve 34 and the second main valve 35 to drive the corresponding actuators. The auxiliary pump 33 supplies pressurized oil to actuators such as the pressurized cylinder, mast cylinder 17, luffing cylinder, and slewing motor through the auxiliary valve 36 to drive the corresponding actuators. The mast cylinder 17 may include a left mast cylinder 171 and a right mast cylinder 172. It can be understood that in another embodiment, which actuators are driven by the first main pump 31 and the second main pump 32 can be adjusted as needed, such as by power distribution; in yet another embodiment, there may be only one main pump and only one main valve.

[0037] In this embodiment, the rotary drilling rig also includes an interactive device with a support rod protection switch. This switch is used to turn the support rod protection function on or off. Specifically, the interactive device can be a touchscreen display with a support rod protection switch button on its interface. Alternatively, the interactive device can be a physical button located on the rotary drilling rig's control panel. Pressing the support rod protection switch activates the support rod protection function.

[0038] Specifically, the connecting body 15 is roughly triangular in shape. The hinge points of the boom 19, connecting arm 21, and mast 13 with the connecting body 15 are located at the three vertices of the connecting body 15, respectively. The hinge point of the mast cylinder 17 with the connecting body 15 is close to the hinge point of the boom 19 with the connecting body 15, and the hinge point of the support rod 23 with the connecting body 15 is close to the hinge point of the connecting arm 21 with the connecting body 15. Specifically, the hinge points of the mast cylinder 17 with the connecting body 15 and the mast 13 are at both ends of the mast cylinder 17, the hinge points of the boom 19 with the connecting body 15 and the fuselage 11 are at both ends of the boom 19, the hinge points of the connecting arm 21 with the connecting body 15 and the fuselage 11 are at both ends of the connecting arm 21, and the hinge points of the support rod 23 with the connecting body 15 and the fuselage 11 are at both ends of the support rod 23.

[0039] This application also provides a method for erecting a mast on a rotary drilling rig, for erecting a mast on the aforementioned rotary drilling rig. Referring to Figure 5, the method for erecting a mast on a rotary drilling rig includes the following steps:

[0040] S11, control the mast cylinder 17 to extend until the mast cylinder 17 is fully extended.

[0041] S13, continue applying the force to extend the mast cylinder 17, causing the bottom surface of the middle mast 133 to contact the top surface of the lower mast 131. Specifically, after the mast cylinder 17 is fully extended, if pressurized oil continues to be supplied to the rodless chamber of the mast cylinder 17, the mast cylinder 17 will become pressurized because it cannot extend further. In actual operation, the operator usually cannot accurately determine whether the mast cylinder 17 is fully extended. Therefore, after the mast cylinder 17 is fully extended, the handle can be operated to continue supplying pressurized oil to the rodless chamber of the mast cylinder 17 to ensure that the bottom surface of the middle mast 133 is in contact with the top surface of the lower mast 131.

[0042] S15, fix the middle mast 133 to the lower mast 131.

[0043] In the rotary drilling rig mast erection method provided in this embodiment, when the mast cylinder 17 is fully extended, the middle mast 133 and the lower mast 131 are in contact. At this time, even if the handle is continued to be operated, the mast cylinder 17 itself will be pressed and limited, and will not impact the support rod 23, so as to protect the support rod 23 and avoid the safety hazard caused by the breakage of the support rod 23.

[0044] In this embodiment, the lower mast 131 tilts forward by a preset angle A when the rotary drilling rig tilts back. When the mast cylinder 17 is fully extended, the middle mast 133 tilts forward by a preset angle A. In step S11, when the mast cylinder 17 drives the middle mast 133 to rotate to the vertical (i.e., the Y-axis angle of the middle mast 133 is 0°), the flow rate of the pressurized oil supplied by the auxiliary pump 33 to the mast cylinder 17 through the auxiliary valve 36 is reduced. This reduces the mast movement speed when the angle between the middle mast 133 and the vertical direction is 0 to A, thereby reducing the pressure impact during stalling.

[0045] Specifically, when the flow rate of pressurized oil supplied to the mast cylinder 17 by the auxiliary pump 33 through the auxiliary valve 36 is reduced, the state of the auxiliary valve 36 can be switched to reduce the valve core opening of the auxiliary valve 36. It can be understood that the pressurized oil supplied to the mast cylinder 17 can also be reduced by decreasing the output flow rate of the auxiliary pump 33. In this case, the auxiliary pump 33 needs to supply oil only to the mast cylinder 17 so that the reduction in the output flow rate of the auxiliary pump 33 does not affect the operation of other actuators.

[0046] Specifically, when the flow rate of pressurized oil supplied to the mast cylinder 17 by the auxiliary pump 33 through the auxiliary valve 36 is reduced, the pressurized oil supplied to the mast cylinder 17 can be halved. Of course, the amount of flow reduction can also be adjusted according to the situation.

[0047] In this embodiment, during the mast erection process, the pressure of the auxiliary pump 33 is acquired. When the pressure of the auxiliary pump 33 reaches the preset pressure, the auxiliary pump 33 is controlled not to supply pressurized oil to the mast cylinder 17 through the auxiliary valve 35. When the mast cylinder 17 drives the middle mast 133 to erect the mast, when the middle mast 133 is tilted forward within the range of 0 to A (0 to 5° in this embodiment), the mast cylinder 17 works normally, and the pressure of the auxiliary pump 33 generally does not exceed a certain value (e.g., 180 bar). When the pressure of the auxiliary pump 33 exceeds the pressure of the equipment during normal mast erection by 20 to 30 bar (e.g., reaching 200 bar), it indicates that the mast cylinder 17 has extended to its maximum extent and has begun to build up pressure. At this time, it also indicates that the middle mast 133 and the lower mast 131 have come into contact. At this time, stopping the supply of pressurized oil to the mast cylinder 17 can prevent the mast cylinder 17 from being over-pressurized, thereby protecting the mast cylinder 17.

[0048] Specifically, when the auxiliary pump 33 is not supplying pressurized oil to the mast cylinder 17 through the auxiliary valve 35, the state of the auxiliary valve 36 can be switched to close the auxiliary valve 36. It can be understood that the auxiliary pump 33 can also be closed to prevent the supply of pressurized oil to the mast cylinder 17. In this case, the auxiliary pump 33 needs to supply oil only to the mast cylinder 17 so that the closure of the auxiliary pump 33 will not affect the operation of other actuators.

[0049] In this embodiment, the rotary drilling rig also includes an interactive device, which is equipped with a support rod protection switch. The support rod protection switch is used to turn the support rod protection function on or off. The rotary drilling rig mast erection method also includes a step prior to step S11:

[0050] S10, press the support rod protection switch to activate the support rod protection function. Specifically, the support rod protection function includes: in step S11, controlling the flow rate of pressurized oil supplied by the auxiliary pump 33 to the mast cylinder 17 through the auxiliary valve 36 to be reduced; and / or, during the mast erection process, when the pressure of the auxiliary pump 33 reaches the preset pressure, controlling the supply of pressurized oil to the mast cylinder 17 to be stopped.

[0051] After the support rod protection function is activated, in step S11, the control can be executed to reduce the flow rate of pressurized oil supplied to the mast cylinder 17 by the auxiliary pump 33 through the auxiliary valve 36, or to control the supply of pressurized oil to the mast cylinder 17 to be stopped. When the support rod protection function is deactivated, even if the mast 13 tilts forward within the range of 0 to 5 degrees, the oil supply to the mast cylinder 17 will not be reduced; even if the pressure of the auxiliary pump 33 reaches the preset pressure, the oil supply to the mast cylinder 17 will not be stopped.

[0052] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A rotary drilling rig, comprising a body (11), a mast (13), a connecting body (15), a mast cylinder (17), a boom (19), a connecting arm (21), and a support rod (23), wherein the mast (13) comprises a lower mast (131) and a middle mast (133), the connecting body (15) is respectively hinged to the middle mast (133), the mast cylinder (17), the boom (19), the connecting arm (21), and the support rod (23), the mast cylinder (17) is also hinged to the middle mast (133), the boom (19) and the connecting arm (21) are respectively hinged to the body (11), and the support rod (23) is also hinged to the lower mast (131), characterized in that, The rotary drilling rig is configured such that the mast cylinder (17) is fully extended when the middle mast (133) and the lower mast (131) are in contact.

2. The rotary drilling rig of claim 1, wherein, The rotary drilling rig is configured such that the lower mast (131) tilts forward by a preset angle A when the rotary drilling rig tilts back, and the tilt angle of the middle mast (133) is consistent with the preset angle A when the mast cylinder (17) is fully extended.

3. The rotary drilling rig of claim 2, wherein, The length of the support rod (23) is designed such that the lower mast (131) tilts forward by the preset angle A when the rotary drilling rig reverses its mast.

4. The rotary drilling rig of claim 1, wherein, The rotary drilling rig also includes an interactive device, which is equipped with a support rod protection switch. The support rod protection switch is used to turn the support rod protection function on or off.

5. A method of erecting a mast for a rotary drilling rig as claimed in claim 1 or 4, c h a r a c t e r i s e d b y The method for erecting a mast for a rotary drilling rig includes: Control the mast cylinder (17) to extend until the mast cylinder (17) is fully extended; Continue to apply the force that extends the mast cylinder (17) so that the bottom end face of the middle mast (133) is in contact with the top end face of the lower mast (131); The middle mast (133) is fixedly connected to the lower mast (131).

6. The method of claim 5, wherein, The lower mast (131) tilts forward at a preset angle A when the rotary drilling rig lowers its mast. When the mast cylinder (17) is fully extended, the middle mast (133) tilts forward at the preset angle A. In the step of controlling the extension of the mast cylinder (17) until the mast cylinder (17) is fully extended, when the mast cylinder (17) drives the middle mast (133) to rotate to vertical, the flow rate of the pressurized oil supplied to the mast cylinder (17) is reduced.

7. The method of claim 6, wherein, The rotary drilling rig also includes an auxiliary pump (33) and an auxiliary valve (36). The auxiliary pump (33) supplies pressurized oil to the mast cylinder (17) through the auxiliary valve (36) to drive the mast cylinder (17) to work. When the flow rate of the pressurized oil supplied to the mast cylinder (17) decreases, the state of the auxiliary valve (36) is switched to reduce the valve core opening of the auxiliary valve (36).

8. The method of claim 5, wherein, The rotary drilling rig also includes an auxiliary pump (33) and an auxiliary valve (36). The auxiliary pump (33) supplies pressurized oil to the mast cylinder (17) through the auxiliary valve (36) to drive the mast cylinder (17) to work. During the mast erection process, the pressure of the auxiliary pump (33) is obtained. When the pressure of the auxiliary pump (33) reaches the preset pressure, the pressure oil is not supplied to the mast cylinder (17).

9. The method of claim 8, wherein, When the control does not supply pressurized oil to the mast cylinder (17), the state of the auxiliary valve (36) is switched to close the auxiliary valve (36).

10. The method of claim 5, wherein, The method for erecting a mast for a rotary drilling rig also includes a step prior to the step of controlling the extension of the mast cylinder (17) until the mast cylinder (17) is fully extended: Activate the support rod protection function; The support rod protection function includes: during the step of controlling the mast cylinder (17) to extend until the mast cylinder (17) is fully extended, when the mast cylinder (17) drives the middle mast (133) to rotate to vertical, controlling the flow rate of the pressurized oil supplied to the mast cylinder (17) to decrease; and / or, the rotary drilling rig also includes an auxiliary pump (33) that supplies pressurized oil to the mast cylinder (17), and during the mast erection process, when the pressure of the auxiliary pump (33) reaches a preset pressure, controlling the auxiliary pump (33) not to supply pressurized oil to the mast cylinder (17).

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