A rotary drilling rig for building foundation and its control method

Abstract

The present invention discloses a rotary drilling rig for building foundations and a control method thereof, aiming to provide a rotary drilling rig for building foundations having an additional pressurizing mechanism, good control effect, simple structure, and strong practicality and a control method thereof. The key points of the technical solution are that a pressurizing device for pressurizing a driving part is also provided on the drill arm, and the pressurizing device includes a drill pressurizer for applying axial pressure to the drill bit and increasing the rotary drilling pressure; a current detector; a displacement sensor; a drill speed sensor for monitoring the speed of the drill bit in real time and providing feedback on the speed of the drill bit within a certain period of time; and a controller for receiving electrical signals from the current detector, the displacement sensor, and the drill speed sensor, analyzing and processing each electrical signal, and outputting an electrical signal to the drill pressurizer indicating whether a pressurization operation is required. The present invention is applicable to the technical field of construction equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of construction equipment, and more particularly to a rotary drilling rig for building foundations and a control method thereof. Background Art

[0002] A pile foundation is a deep foundation consisting of a pile and a pile cap connecting the pile head, or a single pile foundation consisting of a column connected to the pile base. Pile foundations are widely used in high-rise buildings. Before burying the pile foundation, a trench is excavated using a rotary drilling rig to create a column hole for the pile. Concrete is then poured into the ground to form the desired pile foundation.

[0003] The drill bit of the existing rotary drilling rig is driven to rotate by a driving member to excavate the ground. The traditional structure can only control the raising and lowering of the drill bit by a lifting mechanism. However, when encountering hard rock formations, no additional pressure can be applied, and only long-term grinding can be performed, resulting in extremely low work efficiency. Moreover, when encountering different rock formation conditions, there is no special detection method to detect the current rotary drilling situation. Especially when encountering harder rock formations, how to control the drill bit operation to maximize processing efficiency and improve the protection of the drill bit during processing, extend the service life of the drill bit, and greatly improve work efficiency. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide a rotary drilling rig for building foundations and a control method thereof having an additional pressurizing mechanism, good control effect, simple structure, and strong practicality.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a rotary drilling rig for building foundations, comprising a machine body, a drill arm mounted on the machine body, a lifting device cooperating with the drill arm and used to raise and lower the drill arm, a drill bit mounted on the drill arm, and a drive motor for driving the drill bit to rotate, the drill bit and the drive motor being connected to form a drive portion, the drill arm and the drive portion being telescopically connected, the drill arm further being provided with a pressurizing device for pressurizing the drive portion, the pressurizing device including a drill bit pressurizer for applying axial pressure to the drill bit and increasing rotary drilling pressure;

[0006] The current detector is used to monitor the output current of the drive motor in real time and provide feedback on the current size within a certain period of time;

[0007] Displacement sensor, used to monitor the position of the drill bit in real time and provide feedback on the position of the drill bit within a certain period of time;

[0008] The drill bit speed sensor is used to monitor the drill bit speed in real time and provide feedback on the drill bit speed within a certain period of time;

[0009] and a controller for receiving electrical signals from the current detector, the displacement sensor and the drill speed sensor, analyzing and processing each electrical signal, and outputting an electrical signal to the drill pressurizer indicating whether a pressurization operation is required.

[0010] The present invention is further configured as follows: the drill bit pressurizer includes an oil storage chamber, a pressurizing chamber, a piston pressurizing rod arranged in the pressurizing chamber, an oil return chamber, a hydraulic pump for driving the hydraulic oil in the oil storage chamber to the pressurizing chamber, and a three-position four-way reversing valve arranged on the hydraulic pump drive oil circuit; the drill bit pressurizer also includes a front anti-shock structure arranged on the piston pressurizing rod, which is used to buffer the instantaneous impact of the hydraulic pump.

[0011] The present invention is further configured as follows: the front anti-impact structure includes a push plate arranged on the piston pressure rod, a plurality of guide rails arranged on the push plate, a buffer slider arranged on the guide rail, a main bracket arranged at both ends of the guide rail and used to install the guide rail, a buffer assembly arranged between the main bracket and the buffer slider, a force plate arranged on the side of the slider close to the buffer assembly, a connecting rib arranged on the end of the piston pressure rod and corresponding to the main bracket, a buffer bracket one end of which is hinged to the connecting rib and the other end of which is hinged to the buffer slider, and a damping rod one end of which is connected between the buffer and the other end of which is hinged to the push plate.

[0012] The present invention is further configured as follows: the buffer assembly includes a buffer hydraulic chamber arranged on the guide rail, a force-bearing piston arranged in the chamber, a through hole arranged on the force-bearing piston and connecting the rod-shaped and rod-less chambers of the chamber, and a filling liquid arranged in the chamber.

[0013] The present invention is further configured as follows: an electromagnetic ring iron is further provided on the outer wall of the buffer hydraulic chamber, and the filling liquid is a magnetorheological fluid.

[0014] The present invention is further configured as follows: the buffer assembly includes an electromagnet arranged on the guide rail and a permanent magnet arranged on the side of the force-bearing plate close to the electromagnet, and the electromagnet is configured to generate a repulsive force with the permanent magnet when energized.

[0015] The present invention is further configured as follows: the buffer assembly includes a cylinder sleeved outside the guide rail, a shock absorber arranged between the cylinder and the guide rail, an A plate arranged at one end of the shock absorber and in contact with the force plate, and an inner spring arranged in the cylinder and in contact with the bottom of the cylinder and the other end of the shock absorber respectively. The shock absorber is configured to have hard materials at both ends and flexible materials in the middle section, and the flexibility of the middle end gradually decreases from the middle to both sides. When the shock absorber is subjected to force, the middle section of the shock absorber forms an elastic outward expansion.

[0016] The present invention is further configured such that: the buffer component is a force-bearing spring sleeved outside the guide rail.

[0017] By adopting the above technical solution, the beneficial effects are as follows: 1. A booster device for pressurizing the driving part is further provided on the drill arm. The booster device is provided to facilitate the pressure applied to the driving part, thereby increasing the overall drilling pressure and achieving the effect of drilling rock formations of different hardness. The structure is simple and practical. The booster device is further provided to include a drill pressurizer for applying axial pressure to the drill bit and increasing the rotary drilling pressure; a current detector for real-time monitoring the output current of the drive motor and providing feedback on the current within a certain period of time; a displacement sensor for real-time monitoring the position of the drill bit and providing feedback on the position of the drill bit within a certain period of time. The drill bit speed sensor is used to monitor the drill bit speed in real time and provide feedback on the drill bit speed within a certain period of time; and the controller is used to receive the electrical signals from the current detector, the displacement sensor and the drill bit speed sensor, analyze and process each electrical signal, and output an electrical signal to the drill bit pressurizer to indicate whether a pressurization operation is required. The above structure is adopted because the current detector, the displacement sensor and the speed sensor are used to realize the real-time detection of the working state of the drill bit, so that the controller can adjust the pressure of the drill bit pressurizer in real time to cope with various areas of different hardness.

[0018] and a control panel that directs the movement of the hydraulic pump in the hydraulic pump in a direction of advancing, the hydraulic pump in the direction of advancing, the hydraulic pump in the direction of advancing, the hydraulic pump in the direction of advancing, the hydraulic pump in the direction of advancing, the hydraulic pump in the direction of advancing, the hydraulic pump in the direction of

[0019] The cam is mounted on a rear portion of the guide rails, and the cam is mounted on a rear portion of the guide rails, wherein the cam is mounted on a rear portion of the guide rails and the cam is mounted on a rear portion of the guide rails.

[0020] 4. Finally, by setting the buffer component to a different structure, such as setting a force-bearing piston with an opening, and reducing the fluidity of the magnetorheological fluid while undergoing magnetic changes through the magnetorheological fluid, thereby increasing the resistance of the buffer slider, forming a buffer; for another example, by setting an electromagnet on the guide rail and a permanent magnet on the force-bearing plate, the electromagnet generates a repulsive force with the permanent magnet after being energized, thereby achieving buffering; for another example, by setting a shock absorber structure, the shock absorber is set to be hard material at both ends and flexible material in the middle section, and the flexibility of the middle end gradually decreases from the middle to both sides. When the shock absorber is subjected to force, the middle section of the shock absorber forms an elastic outward expansion, and the outward-expanded shock absorber will form a conflict between the cylinder and the guide rail, thereby forming resistance after being subjected to force. It has strong practicality and a simple structure.

[0021] A control method applicable to the above-mentioned rotary drilling rig equipment for building foundations, the controller includes a receiving unit for receiving the electrical signals output by the current detector, the displacement sensor, and the drill speed sensor; a current comparison unit for setting the standard value of the current value during normal operation and no-load, and comparing the real-time current value monitored by the current detector with the standard current value; a displacement comparison unit for comparing the displacement of the drill bit per unit time; a drill speed comparison unit for comparing the speed of the drill bit per unit time; a timing unit for timing the time when the drill bit is in different states; and a control unit for controlling the output current and torque of the drive motor, the start and stop of the drive motor, and the start and stop of the hydraulic pump. The specific operating steps are as follows:

[0022] S1. Survey the rock formation type at the construction site, record the drill bit's no-load current as I0, and set the maximum current during loaded operation as I1 based on the site's geological structure. Set the drill bit's no-load speed to V0 and its maximum speed during loaded operation to V1, and set the displacement the drill bit achieves per unit time to W0.

[0023] S2. During the T1 period, the drill bit operates normally. The drill bit load current is measured to be I, and the drill bit displacement is W. It is determined whether I is less than or equal to I1, and whether W is greater than or equal to WO. If so, the motor is kept operating normally.

[0024] S3. During the T2 period, when I is greater than I1, W is between 0 and WO, and V is less than V1, it is determined that the drill bit is in a slightly hard rock formation, and it is necessary to exit the current position and increase the current output and speed through the controller to escape from the current rock formation;

[0025] S4. During the T3 period, when I is greater than I1, W is equal to 0, and V is less than V1, the drill bit is judged to be in a state where it cannot complete the operation in the current state. At this time, the drill bit exits the current position, and the controller reduces the drill bit speed to increase the drill bit torque. The drill bit pressurizer intervenes and drives the hydraulic pump to apply pressure to the drive part to grind the hard rock formation.

[0026] S5. During the T4 period, continue to monitor the current drill bit position. If W is greater than 0 and less than W0, or if W is greater than or equal to W0, then determine that the drill bit can or has already escaped the current rock formation. After escaping the current rock formation, adjust the drill bit state to the initial state. Otherwise, replace the drill bit with a different hardness before continuing the operation.

[0027] S6. Loop steps S1-S5.

[0028] The present invention is further configured such that: in steps S3, S4 and S5, the adjusted unit time of the drilling operation is 10 minutes.

[0029] By adopting the above technical solution, beneficial effects are achieved. The displacement of the borehole and the current load are used as the basis for detection. According to the local soil quality, the displacement that can be achieved by the current rotation speed is determined, and it is set as the standard to improve the overall control effect. If the required displacement is not achieved, it is necessary to detect the current value of the load and the rotation speed, etc., so as to roughly determine the current state of the rock layer, thereby realizing rotary drilling of different rock layers, and then through the intervention of the drill bit pressurizer, the rotary drilling requirements of different rock layers are realized, and good rotary drilling operations are achieved. The structure is simple, the control effect is stable, and there are relatively few variables that need to be detected, thereby improving the overall rotary drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1The present invention is a structural schematic diagram of a rotary drilling rig for building foundations and a control method thereof.

[0031] Figure 2 The present invention is a structural schematic diagram of a drill pressurizer according to an embodiment of a rotary drilling rig for building foundations and a control method thereof.

[0032] Figure 3 This is an embodiment of a rotary drilling rig for building foundations and its control method. Figure 2 The enlarged schematic diagram of the structure at A in the middle is Example 1.

[0033] Figure 4 This is an embodiment of a rotary drilling rig for building foundations and its control method. Figure 2 The enlarged schematic diagram of the structure at A in the middle is Example 2.

[0034] Figure 5 This is an embodiment of a rotary drilling rig for building foundations and its control method. Figure 2 The enlarged schematic diagram of the structure at A in the middle is Example 3.

[0035] Figure 6 This is an embodiment of a rotary drilling rig for building foundations and its control method. Figure 2 The enlarged schematic diagram of the structure at A in the middle is Example 4.

[0036] The reference numerals in the figure are as follows: 1. machine body; 10. drill arm; 11. lifting device; 101. drill bit; 200. oil storage chamber; 201. pressurizing chamber; 202. piston pressurizing rod; 203. oil return chamber; 204. hydraulic pump; 205. three-position four-way reversing valve; 210. push plate; 211. guide rail; 212. buffer slider; 213. main bracket; 214. force plate; 215. connecting rib; 216. buffer bracket; 217. damping rod; 301. buffer pressure chamber; 302. force piston; 303. through hole; 304. electromagnetic ring iron; 40. electromagnet; 41. permanent magnet; 50. cylinder; 51. shock absorber; 60. force spring. DETAILED DESCRIPTION

[0037] Reference Figures 1 to 6 The present invention further describes a rotary drilling rig for building foundations and a control method thereof.

[0038] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0039] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0040] Example 1

[0041] A rotary drilling rig for building foundations, comprising a body 1, a drill arm 10 disposed on the body 1, a lifting device 11 cooperating with the drill arm 10 and used to raise and lower the drill arm 10, a drill bit 101 disposed on the drill arm 10, and a drive motor for driving the drill bit 101 to rotate. The drill bit 101 and the drive motor are connected to form a drive portion, and the drill arm 10 and the drive portion are telescopically connected. The drill arm 10 is also provided with a booster device for pressurizing the drive portion. The booster device includes a drill bit 101 booster for applying axial pressure to the drill bit 101 and increasing the rotary drilling pressure.

[0042] In the embodiment of the present application, the lifting device 11 is mainly responsible for the lifting and lowering of the drill arm 10 and cannot increase the pressure during rotation to a large extent. The pressure during rotary drilling needs to be increased by a booster device. At the same time, it is ensured that the drill arm 10 and the driving part are telescopically and movably connected. The booster device can form the effects of pressurization, decompression and pressure maintenance, thereby achieving adaptive operations for different rock formations. It is highly practical and has a simple structure.

[0043] A current detector is used to monitor the output current of the drive motor in real time and provide feedback on the current size within a certain time period; a displacement sensor is used to monitor the position of the drill bit 101 in real time and provide feedback on the position of the drill bit 101 within a certain time period; a drill bit 101 speed sensor is used to monitor the speed of the drill bit 101 in real time and provide feedback on the speed of the drill bit 101 within a certain time period; and a controller is used to receive electrical signals from the current detector, the displacement sensor and the drill bit 101 speed sensor, analyze and process each electrical signal, and output an electrical signal to the drill bit 101 pressurizer to indicate whether a pressurization operation is required.

[0044] The drill arm 10 is also provided with a booster device for pressurizing the driving part. The booster device is provided to facilitate the pressure applied to the driving part, thereby increasing the overall drilling pressure and achieving the effect of drilling rock formations of different hardness. The structure is simple and practical. The booster device is further provided to include a drill bit 101 pressure booster for applying axial pressure to the drill bit 101 and increasing the rotary drilling pressure; a current detector for monitoring the output current of the drive motor in real time and providing feedback on the current size within a certain period of time; a displacement sensor for monitoring the position of the drill bit 101 in real time and providing feedback on the position of the drill bit 101 within a certain period of time; and a drill bit 101. A rotation speed sensor is used to monitor the rotation speed of the drill bit 101 in real time and provide feedback on the rotation speed of the drill bit 101 within a certain period of time; and a controller is used to receive electrical signals from the current detector, displacement sensor, and the rotation speed sensor of the drill bit 101, analyze and process each electrical signal, and output an electrical signal to the pressurizer of the drill bit 101 to indicate whether a pressurization operation is required. The above structural arrangement realizes real-time detection of the working status of the drill bit 101 by using the current detector, displacement sensor, and rotation speed sensor, so that the pressure of the pressurizer of the drill bit 101 can be adjusted in real time by the controller to cope with various areas of different hardness.

[0045] The present invention is further configured as follows: the drill bit 101 pressurizer includes an oil storage chamber 200, a pressurizing chamber 201, a piston pressurizing rod 202 arranged in the pressurizing chamber 201, an oil return chamber 203, a hydraulic pump 204 for driving the hydraulic oil in the oil storage chamber 200 to the pressurizing chamber 201, and a three-position four-way reversing valve 205 arranged on the hydraulic pump 204 driving oil circuit, the drill bit 101 pressurizer also includes a front anti-shock structure arranged on the piston pressurizing rod 202, the front anti-shock structure is used to buffer the instantaneous impact of the hydraulic pump 204, and further the drill bit 101 pressurizer includes an oil storage chamber 200, a pressurizing chamber 201, a piston pressurizing rod 202 arranged in the pressurizing chamber 201, an oil return chamber 203, a hydraulic pump 204 for driving the hydraulic oil in the oil storage chamber 200 to the pressurizing chamber 201, and a three-position four-way reversing valve 205 arranged on the hydraulic pump 204 driving oil circuit. The three-position four-way reversing valve 205 on the drill bit 101 adopts the above-mentioned structural setting, the oil storage chamber 200 and the oil return chamber 203 are used as the reserve of hydraulic oil, and the hydraulic pump 204 is used as the main power source, and in conjunction with the three-position four-way reversing valve 205, the piston pressure rod 202 is formed to reciprocate, thereby ensuring the effect of pressurizing, resetting or maintaining pressure on the driving part, and further the drill bit 101 pressurizer is set to also include a front anti-shock structure provided on the piston pressure rod 202, the front anti-shock structure is used to buffer the instantaneous impact of the hydraulic pump 204, and the above-mentioned structural setting is adopted. The front anti-shock structure provided can form a buffer for the driving part while the drill bit 101 pressurizer is pressurizing, reduce damage to the driving part, and ensure the formation of gradual pressure and pressure stabilization effect, which is highly practical and simple in structure;

[0046] The present invention is further configured such that the front anti-impact structure includes a push plate 210 provided on the piston pressure rod 202, a plurality of guide rails 211 provided on the push plate 210, a buffer slider 212 provided on the guide rail 211, a main bracket 213 provided at both ends of the guide rail 211 and used for mounting the guide rail 211, a buffer assembly provided between the main bracket 213 and the buffer slider 212, a force plate 214 provided on the side of the slider close to the buffer assembly, and a buffer assembly provided on the piston pressure rod 202. The front anti-impact structure includes a push plate 210 provided on the piston pressure rod 202, a plurality of guide rails 211 provided on the push plate 210, a buffer slider 212 provided on the guide rail 211, and a buffer bracket 216 with one end hinged to the connecting rib 215 and the other end hinged to the buffer slider 212. 11 and a main bracket 213 for mounting the guide rail 211, a buffer assembly arranged between the main bracket 213 and the buffer slider 212, a force-bearing plate 214 arranged on the side of the slider close to the buffer assembly, a connecting rib 215 arranged on the end of the piston pressure rod 202 and corresponding to the main bracket 213, a buffer bracket 216 hinged at one end to the connecting rib 215 and the other end to the buffer slider 212, and a damping rod 217 hinged at one end to the buffer and the other end to the push plate 210. The above-mentioned structural arrangement is adopted because the main bracket 213 structure is arranged between the push plate 210 and the end of the piston pressure rod 202, in conjunction with the buffer bracket 216 and the buffer assembly, the buffer slider 212 slides on the guide rail 211 when subjected to force, converts the axial impact into a radial force, forming the first step of buffering, and through the provided buffer assembly, the second step of buffering of the impact is achieved, which greatly improves the overall pressure stability, has a simple structure and is highly practical.

[0047] The present invention is further configured such that the buffer assembly includes a buffer hydraulic chamber 301 arranged on the guide rail 211, a force-bearing piston 302 arranged in the chamber, a through hole 303 arranged on the force-bearing piston 302 and connecting the rod-shaped and rod-less chambers of the chamber, and a filling liquid arranged in the chamber.

[0048] The present invention is further configured such that an electromagnetic ring iron 304 is further provided on the outer wall of the buffer hydraulic chamber 301 , and the filling fluid is a magnetorheological fluid.

[0049] By setting the buffer component to have different structures, such as setting a force-bearing piston 302 with an opening, when the force-bearing piston 302 is subjected to force, the filling liquid in the cavity will form a buffer for the piston movement. This is the first buffer, and according to the size of the pressure, the magnetorheological fluid can be used to reduce the fluidity of the magnetorheological fluid while undergoing magnetic changes, thereby increasing the resistance of the buffer slider 212 to form a second buffer.

[0050] Example 2

[0051] The structure of this embodiment is basically the same as that of the first embodiment, with the only difference being that the buffer assembly includes an electromagnet 40 provided on the guide rail 211 and a permanent magnet 41 provided on the side of the force-bearing plate 214 close to the electromagnet 40, and the electromagnet 40 is configured to generate a repulsive force with the permanent magnet 41 when energized. By providing the electromagnet 40 on the guide rail 211 and the permanent magnet 41 on the force-bearing plate 214, a repulsive force is generated between the electromagnet 40 and the permanent magnet 41 when energized, thereby achieving buffering.

[0052] Example 3

[0053] The structures of this embodiment and embodiment 1 are basically the same, with the only difference being that the buffer assembly includes a cylinder 50 sleeved on the outside of the guide rail 211, a shock absorber 51 arranged between the cylinder 50 and the guide rail 211, an A-plate arranged at one end of the shock absorber 51 and in contact with the force plate 214, and an inner spring arranged in the cylinder 50 and in contact with the bottom of the cylinder 50 and the other end of the shock absorber 51 respectively. The shock absorber 51 is configured to have hard materials at both ends and flexible materials in the middle section, and the flexibility of the middle end gradually decreases from the middle to both sides. When the shock absorber 51 is subjected to force, the middle section of the shock absorber 51 forms an elastic outward expansion.

[0054] For another example, by setting up a shock absorber 51 structure, the shock absorber 51 is set to be made of hard material at both ends and flexible material in the middle section, and the flexibility of the middle end gradually decreases from the middle to both sides. When the shock absorber 51 is subjected to force, the middle section of the shock absorber 51 forms an elastic outward expansion. After the outward expansion, the shock absorber 51 will form a conflict between the cylinder 50 and the guide rail 211, thereby forming resistance after the force is applied. It is highly practical and has a simple structure.

[0055] Example 4

[0056] The structure of this embodiment is basically the same as that of embodiment 1. The only difference is that the buffer component is a force spring 60 that is sleeved outside the guide rail 211. By simply sleeveing ​​the force spring 60 outside the guide rail 211 and cooperating with the force plate 214 structure, a buffer is formed when the force plate 214 impacts the force spring 60. Of course, the effect of relying solely on the force spring 60 is relatively small, the structure is relatively simple, and it is highly practical.

[0057] A control method for the rotary drilling rig for building foundations, wherein the controller includes a receiving unit for receiving electrical signals output by a current detector, a displacement sensor, and a drill bit 101 speed sensor; a current comparison unit for setting a standard current value during normal operation and no-load, and comparing the real-time current value monitored by the current detector with the standard current value; a displacement comparison unit for comparing the displacement of the drill bit 101 per unit time; a drill bit 101 speed comparison unit for comparing the speed of the drill bit 101 per unit time; a timing unit for timing the time when the drill bit 101 is in different states; and a control unit for controlling the output current and torque of the drive motor, the start and stop of the drive motor, and the start and stop of the hydraulic pump 204. The specific operating steps are as follows:

[0058] S1. Survey the rock formation type at the construction site, record the current of the drill bit 101 when it is unloaded as I0, and set the maximum current during loaded operation to I1 based on the geological structure of the site; set the speed of the drill bit 101 when it is unloaded to V0, the maximum speed during loaded operation to V1, and set the displacement achieved by the drill bit 101 per unit time to W0;

[0059] S2. During the T1 period, the drill bit 101 operates normally. At this time, the load current of the drill bit 101 is measured to be I, and the displacement of the drill bit 101 is W. It is determined whether I is less than or equal to I1, and whether W is greater than or equal to WO. If so, the motor maintains normal operation.

[0060] S3. During the T2 period, when I is greater than I1, W is between 0 and WO, and V is less than V1, it is determined that the drill bit 101 is in a slightly hard rock formation, and it is necessary to exit the current position and increase the current output and rotation speed through the controller to escape from the current rock formation;

[0061] S4. During the T3 period, when I is greater than I1, W is equal to 0, and V is less than V1, it is determined that the drill bit 101 is in a state where it cannot complete the operation in the current state. At this time, the drill bit 101 exits the current position, and the controller reduces the speed of the drill bit 101 to increase the torque of the drill bit 101. The drill bit 101 pressure booster intervenes and drives the hydraulic pump 204 to apply pressure to the driving part to grind the hard rock formation.

[0062] S5. During the T4 period, continue to monitor the current position of the drill bit 101. If W is greater than 0 and less than W0, or if W is greater than or equal to W0, it is determined that the drill bit 101 can escape from the current rock formation or has escaped from the current rock formation. After escaping the current rock formation, adjust the state of the drill bit 101 to the initial state. Otherwise, it is necessary to replace the drill bit 101 with a higher hardness before continuing the operation.

[0063] S6. Loop steps S1-S5.

[0064] The present invention is further configured such that: in steps S3, S4 and S5, the adjusted unit time of the drilling operation is 10 minutes.

[0065] By adopting the above technical solution, beneficial effects are achieved. The displacement of the borehole and the load of the current are used as the basis for detection. According to the local soil quality, the displacement that can be achieved by the current rotation speed is determined, and it is set as the standard to improve the overall control effect. If the required displacement is not achieved, it is necessary to detect the current value of the load and the rotation speed, etc., so as to roughly determine the current state of the rock formation, thereby realizing rotary drilling of different rock formations, and then through the intervention of the drill bit 101 pressurizer, the rotary drilling requirements of different rock formations are realized, and good rotary drilling operations are achieved. The structure is simple, the control effect is stable, and there are relatively few variables that need to be detected, thereby improving the overall rotary drilling efficiency.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotary drilling rig for building foundations, comprising a machine body (1), a drill arm (10) arranged on the machine body (1), a lifting device (11) cooperating with the drill arm (10) and used for lifting and lowering the drill arm (10), a drill bit (101) arranged on the drill arm (10), and a drive motor for driving the drill bit (101) to rotate, wherein the drill bit (101) and the drive motor are connected to form a drive part, and the drill arm (10) and the drive part are telescopically connected, characterized in that The drill arm (10) is also provided with a booster device for pressurizing the driving part, and the booster device includes a drill bit (101) pressurizer, which is used to apply axial pressure to the drill bit (101) and increase the rotary drilling pressure; The current detector is used to monitor the output current of the drive motor in real time and provide feedback on the current size within a certain period of time; A displacement sensor for monitoring the position of the drill bit (101) in real time and providing feedback on the position of the drill bit (101) within a certain period of time; A drill bit (101) rotation speed sensor is used to monitor the rotation speed of the drill bit (101) in real time and provide feedback on the rotation speed of the drill bit (101) within a certain period of time; and a controller for receiving electrical signals from a current detector, a displacement sensor, and a drill bit (101) speed sensor, analyzing and processing each electrical signal, and outputting an electrical signal to a drill bit (101) pressurizer indicating whether a pressurization operation is required. The drill bit (101) pressurizer comprises an oil storage chamber (200), a pressurizing chamber (201), a piston pressurizing rod (202) disposed in the pressurizing chamber (201), an oil return chamber (203), a hydraulic pump (204) for driving hydraulic oil in the oil storage chamber (200) to the pressurizing chamber (201), and a three-position four-way reversing valve (205) disposed on an oil path driven by the hydraulic pump (204). The drill bit (101) pressurizer also comprises a front anti-shock structure disposed on the piston pressurizing rod (202), the front anti-shock structure being used to prevent instantaneous impacts of the hydraulic pump (204). The buffering and front anti-impact structure include a push plate (210) arranged on a piston pressure rod (202), a plurality of guide rails (211) arranged on the push plate (210), a buffer slider (212) arranged on the guide rail (211), a main bracket (213) arranged at both ends of the guide rail (211) and used for mounting the guide rail (211), a buffer assembly arranged between the main bracket (213) and the buffer slider (212), a force plate (214) arranged on the side of the slider close to the buffer assembly, a connecting rib (215) arranged on the end of the piston pressure rod (202) and corresponding to the main bracket (213), a buffer bracket (216) with one end hinged to the connecting rib (215) and the other end hinged to the buffer slider (212), and a damping rod (217) with one end connected to the buffer and the other end hinged to the push plate (210).

2. A rotary drilling rig for building foundation according to claim 1, characterized in that: The buffer assembly comprises a buffer hydraulic chamber (301) arranged on a guide rail (211), a force-bearing piston (302) arranged in the chamber, a through hole (303) arranged on the force-bearing piston (302) and connecting the rod chamber and the rodless chamber, and a filling liquid arranged in the chamber.

3. A rotary drilling rig for building foundation according to claim 2, characterized in that: An electromagnetic ring iron (304) is further provided on the outer wall of the buffer hydraulic chamber (301), and the filling liquid is a magnetorheological fluid.

4. A rotary drilling rig for building foundation according to claim 1, characterized in that: The buffer assembly comprises an electromagnet (40) arranged on a guide rail (211) and a permanent magnet (41) arranged on a side of a force-bearing plate (214) close to the electromagnet (40), and the electromagnet (40) is configured to generate a repulsive force with the permanent magnet (41) when energized.

5. The rotary drilling rig for building foundation according to claim 1, characterized in that: The buffer assembly comprises a cylinder (50) sleeved outside the guide rail (211), a shock absorber (51) arranged between the cylinder (50) and the guide rail (211), an A plate arranged at one end of the shock absorber (51) and in contact with the force plate (214), and an inner spring arranged in the cylinder (50) and in contact with the bottom of the cylinder (50) and the other end of the shock absorber (51), respectively. The shock absorber (51) is configured such that both ends are made of hard material and the middle section is made of flexible material, and the flexibility of the middle end gradually decreases from the middle to both sides. When the shock absorber (51) is subjected to force, the middle section of the shock absorber (51) elastically expands outwards.

6. A rotary drilling rig for building foundation according to claim 1, characterized in that: The buffer component is a force-bearing spring (60) sleeved outside the guide rail (211).

7. A control method for a rotary drilling rig for building foundations according to any one of claims 1 to 6, characterized in that: The controller includes a receiving unit for receiving electrical signals output by a current detector, a displacement sensor, and a drill bit (101) speed sensor; a current comparison unit for setting a standard current value during normal operation and no-load operation, and comparing the real-time current value monitored by the current detector with the standard current value; a displacement comparison unit for comparing the displacement of the drill bit (101) per unit time; a drill bit (101) speed comparison unit for comparing the speed of the drill bit (101) per unit time; and a timing unit for timing the time when the drill bit (101) is in different states. And a control unit for controlling the output current and torque of the drive motor, the start and stop of the drive motor, and the start and stop of the hydraulic pump (204). The specific operation steps are as follows: S1. Survey the rock formation type at the construction site, record the current of the drill bit (101) when it is unloaded as I0, and set the maximum current when it is loaded as I1 according to the geological structure of the site; the speed of the drill bit (101) when it is unloaded is V0, the maximum speed when it is loaded is V1, and set the displacement of the drill bit (101) per unit time as W0; S2. During the T1 period, the drill bit (101) operates normally. At this time, the load current of the drill bit (101) is measured to be I, and the displacement of the drill bit (101) is measured to be W. It is determined whether I is less than or equal to I1, and whether W is greater than or equal to WO. If so, the motor is kept in normal operation. S3, in the time period T2, when I is greater than I1, W is between 0 and WO, and V is less than V1, it is determined that the drill bit (101) is in a slightly hard rock formation, and it is necessary to exit the current position, and increase the current output and the rotation speed through the controller to escape from the current rock formation; S4. During the T3 period, when I is greater than I1, W is equal to 0, and V is less than V1, it is determined that the drill bit (101) is in a state where the drill bit (101) cannot complete the operation in the current state. At this time, the drill bit (101) exits the current position, and the controller reduces the rotation speed of the drill bit (101), increases the torque of the drill bit (101), and the drill bit (101) pressure booster intervenes and applies pressure to the driving part by driving the hydraulic pump (204) to grind the hard rock formation. S5. During the T4 time period, continue to monitor the current position state of the drill bit (101). If W is greater than 0 and less than W0, or W is greater than or equal to W0, it is determined that the drill bit (101) can escape from the current rock formation or has escaped from the current rock formation. After escaping the current rock formation, adjust the state of the drill bit (101) to the initial state. Otherwise, it is necessary to replace another drill bit (101) with a higher hardness before continuing the operation. S6. Repeat steps S1-S5.

8. The control method of a rotary drilling rig for building foundation according to claim 7, characterized in that: In steps S3, S4 and S5, the adjusted unit time of the drilling operation is 10 minutes.

Images