Roadbed mixing pile construction equipment with automatic gear lifting function and lifting method

Abstract

The invention discloses roadbed mixing pile construction equipment with an automatic gear lifting function and a lifting method. The roadbed mixing pile construction equipment comprises a visual console, an electromagnetic reversing valve and an automatic gear shifting device. A display screen, a magnetic field intensity control knob, a speed control knob, a descending, pausing and ascending three-gear switch, a manual control knob and a connecting wire connected to the hoisting and detecting module are arranged on the visual control table; the electromagnetic reversing valve comprises a baffle, an electromagnetic rotating wheel and an oil pipe which are preset in an oil pipe passage, manual operation is replaced by automatic control, and the labor intensity of personnel is relieved; the inefficient time during manual operation is basically eliminated, the working efficiency is improved, the drilling depth of one day is greatly improved, and the advantages of an automatic pile machine are more obvious when a plurality of pile machines are used for construction at the same time; and the piling machine can normally drill in severe cold and summer heat, and the application range of the piling machine is enlarged.

Description

Technical Field

[0001] This invention belongs to the field of automatic gear return technology for pile drivers, specifically relating to a roadbed mixing pile construction equipment and return method with automatic gear return. Background Technology

[0002] Drilled cast-in-place piles, including winches, brake levers, clutch levers, pile frames, and pile hammers, are all manually operated. As a foundation type, they are widely used in highway and bridge construction due to their strong adaptability, high bearing capacity, good stability, small settlement, moderate cost, and simple construction. The drilling and grouting pile operation involves using a power device to lift a heavy impact hammer to a certain height, then allowing the hammer to fall freely. The impact force periodically breaks the bottom of the borehole, forming a pile hole of a certain diameter and depth. Drilled cast-in-place pile machines play an important role in pile foundation construction due to their simple construction process, strong adaptability, and lack of special requirements for geological formations. However, this traditional drilled cast-in-place pile construction process has the following problems: (1) Most of the currently used bored piles are interactive mechanical operation types, which are all manually operated. Construction workers need to frequently pull the clutch and brake levers during the working process to control the winch, thereby controlling the lifting and lowering of the pile hammer. During the hole-forming period, each machine must be equipped with pile driving operations, requiring a large amount of manpower. The working environment for construction workers is harsh. The pile driver generates high-decibel noise, strong vibration and a large amount of dust, making construction workers susceptible to respiratory diseases. Protective equipment is required for protection, which also increases the physical burden. Construction workers working in this environment for a long time will be in a state of constant tension, and are prone to fatigue.

[0003] (2) Traditional bored piles place extremely high demands on construction personnel, requiring specialized operators. Operators must not only be familiar with the equipment's operating procedures but also possess certain mechanical and electrical knowledge to handle potential problems during construction; otherwise, improper operation can easily lead to safety accidents or equipment damage. To ensure operators are proficient in operating and maintaining mechanized pile drivers, specialized training is necessary, resulting in high costs, including expenses for instructors, teaching materials, and equipment, thus increasing construction costs.

[0004] (3) Mechanized pile drivers have a complex structure, including multiple systems such as mechanical, electrical, and hydraulic systems. Once a fault occurs, the repair is difficult, requires highly skilled maintenance personnel, and takes a long time, which will affect the construction progress. High equipment cost: The initial investment in purchasing mechanized pile drivers is large, and the maintenance and upkeep costs of the equipment are also high. Regular replacement of parts and lubrication maintenance are required, and fault repair is complex.

[0005] During the construction of bored piles, the lifting height of the pile hammer is controlled by manual visual estimation. However, due to the influence of the operator's physical condition and technical ability, it is difficult to keep the stroke of the pile hammer consistent under this operating method, resulting in unstable hole formation efficiency. Occasional negligence can easily cause the hammer to jam. The labor intensity is high, the safety factor is low, the operation is complicated, and the construction quality is difficult to guarantee. Summary of the Invention

[0006] The purpose of this invention is to provide a roadbed mixing pile construction equipment and recovery method with automatic gear shifting and recovery, so as to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a roadbed mixing pile construction equipment and recovery method with automatic gear shifting, including a visual control console, an electromagnetic reversing valve and an automatic gear shifting device; The visual control console is equipped with a display screen, a magnetic field strength control knob, a speed control knob, a three-position switch for descent, pause, and ascent, a manual control knob, and a connection cable to the hoisting and detection module; The electromagnetic directional valve includes a baffle pre-installed in the oil pipe passage, an electromagnetic rotating wheel, and an oil pipe.

[0008] The automatic gear shifting device includes an electromagnet, an electromagnet, and an energized solenoid coil.

[0009] Each gear position has an automatic shifting device connected to its bottom. This device consists of an electromagnet with a different magnetic force installed in each gear position. An electromagnet is placed at the unloaded end of the pipe, and the other end is connected to a fixed electromagnet. A energized solenoid coil is connected to each electromagnet.

[0010] As a further preferred embodiment, the visualization console is equipped with a detachable tripod at its base. When the environment is unsuitable for placing the console on the ground, it can be fixed to the tripod for operation. The tripod has a turntable, which allows adjustment of the visualization console's angle for convenient operation. A telescopic rod is also provided between the turntable and the visualization console, allowing for rough adjustment of the console's level.

[0011] As a further preferred option, the bottom of the block is a telescopic support leg, and the two telescopic supports can be adjusted up and down independently to adapt to possible terrain differences on site.

[0012] A method for automatically retracting the gear of a piling machine includes the following steps: Step 1: Install the depth measuring instrument on the lifting mechanism of the piling rig. Secure the depth measuring instrument with welding rods or steel bars, ensuring that both the lifting mechanism and the depth measuring instrument move simultaneously. After securing, initiate the mechanical calibration operation. Verify the accuracy of the depth measuring instrument by manually inputting a known depth value or by utilizing the actual movement of the piling rig. If any deviation is found, reinstallation is required. Step 2: Remove the mechanical components connecting the reverse gear and clutch assembly. Connect the depth measuring instrument and automatic shifting device to the visual automatic control console. Connect the visual automatic control console to the solenoid directional valve via a connecting cable. Install hydraulic cylinders on the outside of the reverse gear and clutch gears, and connect the hydraulic pump to the main oil circuit. Connect the overflow valve, solenoid directional valve, and hydraulic cylinders. Step 3: Turn on the power switch on the visual automatic control console and set the required pile length, drilling speed, and lifting speed, among other relevant parameters. As the drilling rig runs and continues drilling, the measuring instrument will send feedback information to the automatic control console. The automatic control console will then continuously increase the current I in the energized solenoid based on the speed change, thereby altering the magnetic induction intensity B. The magnetic induction intensity B of a single current loop of the energized solenoid in space is: ; In the formula, I is the current in the coil. Let be the vacuum permeability, and r be the vector from point A (position A is electromagnet 28) to the infinitesimal element on the ring.

[0013] Electromagnet one moves in the direction of the electromagnet's attraction and is attracted to the electromagnet in the forward gear. The gear lever is also automatically engaged due to the magnetic attraction. Since the distance between the electromagnet and electromagnet one is relatively large, we consider the electromagnet as a magnetic dipole, and the attractive force it generates is: ; In the formula, k is an empirical coefficient. The permeability of free space, Let m be the magnetic moment of the two electromagnets (specifically, the magnetic moment between electromagnets 27 and 28) (m=NIS), and d be the distance between the centers of the two magnets.

[0014] Since electromagnets 1 and 2 will be in contact with each other at a very small distance, we can simplify the model to represent their attractive force as follows: ; In the formula, S is the area of ​​the cross-section of the magnet. The permeability of free space, denoted as magnetic flux density.

[0015] The maximum static friction force f it experiences is: ; In the formula, is the coefficient of friction.

[0016] When the speed reaches a certain value, that is, when I in the energized solenoid increases to a certain value, the attractive force on the electromagnet is greater than the maximum static friction force f, that is: ; Thus, it leaves gear 1 and is attracted to gear 2, and the gear lever is automatically engaged in gear 2 due to the attraction of the magnet.

[0017] Step 4: The visual automatic control console sends an electrical signal to the solenoid directional valve to control the solenoid rotating wheel, which in turn rotates the baffle by a certain angle, thereby controlling the oil volume and direction in the oil pipe; the baffle rotates at this angle as follows: Its rotation angle The pipe cross-sectional area A satisfies: ; In the formula, R is the radius of the tubing.

[0018] According to the flow calculation formula: ; In the formula, V is the gasoline flow rate in the oil pipe.

[0019] The amount of gasoline flowing into the cylinder can be calculated, thereby controlling the drilling and lifting rate.

[0020] Step 5: After the pile body is formed, the depth measuring instrument will send feedback to the visual automatic control console. The DC power supply of the visual automatic control console will generate a specified current I, causing the electromagnet to move to the reverse gear magnet, thus automatically engaging reverse gear. Simultaneously, the visual automatic control console controls the electromagnetic reversing valve to switch directions and adjust the angle. Achieve automatic drill bit lifting; Step Six: After the drill bit is raised to the initial position, the visual automatic control console will display "Work Completed" and turn off the DC power supply, with the current I becoming 0. The electromagnet loses its magnetic force, and therefore, electromagnet I automatically resets under the influence of gravity.

[0021] The technical effects and advantages of this invention are: 1. Automated control replaces manual operation, reducing the labor intensity of personnel; 2. It has largely eliminated the inefficiency time of manual operation, improved work efficiency, and significantly improved the daily drilling depth. When multiple pile drivers are working simultaneously, the advantages of automated pile drivers will be even more obvious. 3. This allows the piling machine to drill normally in both extremely cold and hot weather, expanding its applicable range; 4. The entire set of equipment is automatically controlled by a programmable logic controller (PLC). The PLC has the characteristics of high safety performance, strong stability and low failure rate, which improves the safety level of the entire set of equipment. The program running by the PLC has a safety protection part. The stop sensor, as a protection device, is an extension of the safety protection of the PLC program, preventing accidents caused by the pile hammer rising unexpectedly.

[0022] 5. All the settings for the descent, pause, and ascent are located on the control panel, making them simple, convenient, and easy to operate; 6. It produces high-quality holes and is environmentally friendly and material-saving. It solves the problem that the drilling construction of percussion piles used to rely entirely on manual operation, greatly improves the construction quality of percussion piles, and meets the current national standards for technological and green building construction.

[0023] 7. Construction costs are significantly reduced. Construction workers only need simple training to fully master the essentials of automated pile driver control, saving training and personnel costs. 8. When further movement to the electromagnet is required, the operator restarts the electromagnet, increasing the current so that the electromagnet resists its attraction and shifts slightly to one side. This triggers the second touch switch, de-energizing the electromagnet and causing it to lose its attraction. The electromagnet then moves quickly to its bottom. During this movement, the above steps are repeated, first triggering the corresponding touch switch at the bottom of the electromagnet, and then operating as described above. The entire process utilizes magnetic force to engage the gear, avoiding the problem of magnetic ambiguity. Factors such as distance, attraction, tilt angle, and object mass all affect the accurate gear switching between electromagnets, requiring high precision and incurring high costs. The structure of embodiment two allows for lower precision standards through structural design while maintaining accurate gear engagement, reducing costs and facilitating operation with a high degree of automation, without requiring additional manual labor. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the hydraulic system structure of the present invention; Figure 2 This is a schematic diagram of the visual automatic control console of the present invention; Figure 3 This is a schematic diagram of the electromagnetic reversing valve of the present invention; Figure 4 This is a schematic diagram of the electromagnetic reversing valve operation of the present invention.

[0025] Figure 5 This is a schematic diagram of the automatic gear shifting device of the present invention; Figure 6 This is a schematic diagram of the installation positions of the receiving device and the transmitting device of the present invention; Figure 7 This is a schematic diagram of the installation structure of multiple electromagnets of the present invention; Figure 8 This is a schematic diagram of the mounting structure of the tactile switch 2 of the present invention; Figure 9 This is a schematic diagram of the structure of the electromagnet 27 of the present invention; Figure 10 This is an exploded view of the electromagnet 27 of the present invention.

[0026] In the diagram: 1-Visual automatic control console main box, 2-Display screen, 3-Automatic gear shifting device, 4-Manual switching control knob, 5-Speed ​​control knob, 6-Three-position switch for descent, pause, and ascent, 7-Manual control knob, 8-Tripod, 9-Telescopic rod, 10-Turntable, 11-Connecting cable, 12-Oil tank, 13-Hydraulic pump, 14-Main oil pipe, 15-Visual automatic control console, 16-Solenoid directional valve, 17-Relief valve, 18-Hydraulic cylinder, 19-Depth measuring instrument, 20-Baffle, 21- Electromagnetic rotating wheel, 22~27-Electromagnet 1, 2701-Spring, 2702-Guide rod, 2703-Metal top plate, 2705-Slider, 2706-Telescopic platform, 2707-Tactile switch 3, 2708-Spring 2, 2709-Groove, 2710-Electromagnetic plate, 2711-Tactile switch 4, 28-Electrified solenoid, 29-Electromagnet, 30-Receiver, 31-Transmitter, 32-Slide rail, 33-Tactile switch 1, 34-Tactile switch 2, 35-Housing shell. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: The present invention provides a roadbed mixing pile construction equipment and recovery method with automatic gear shifting as shown in the figure. The equipment includes a visual control console 15, an automatic gear shifting device 3, and an electromagnetic reversing valve 16. The visual control console 15 and the electromagnetic reversing valve 16 are connected by a connecting line 11. The automatic gear shifting device 3 is connected to the visual control console 15, and the two parts are inseparable and work together as a unified whole.

[0029] The visual control console 15 includes a display screen 2, a manual switching control knob 4, a speed control knob 5, a three-position switch for descent, pause, and ascent 6, a manual control knob 7, and a tripod 8, all mounted on the main console box.

[0030] Display screen 2 is located in the center of the main body of the visualization console 15 and is used to display relevant parameters such as depth and speed.

[0031] The manual switching control knob 4 is used to switch the instrument from automatic mode to manual operation.

[0032] The speed control knob 5 is used to manually control the rising and falling speed of the pile driver and the depth measuring instrument 19. In automatic mode, the speed will change automatically.

[0033] The three-position switch 6, which controls the descent, pause, and ascent, is used for manual control of the pile driver and depth measuring instrument 19. In automatic mode, it will automatically switch on and off.

[0034] The manual control knob 7 is used to manually control the rotation of the drive shaft to control the rise and fall of the pile driver when the three-position switch 6 (lowering, pause, and rising) is set to the pause position.

[0035] Below the main box 1 of the visualization console is a horizontal tripod 8 for the control device. The three long legs of the tripod 8 allow the console to be placed stably on the ground. The three legs of the tripod 8 can be extended and retracted and fixed in length, and can be adjusted for level. The turntable 10 can control the main box 1 of the visualization console to rotate around the device axis. The tripod 8 is connected to the main box 1 of the visualization console through three micro-adjustable telescopic rods 9.

[0036] The electromagnetic directional valve 16 is connected to the visualization control console 15 via a connecting cable 11, which serves as both a power supply and a data transmission cable. The middle section of the electromagnetic directional valve 16 is a baffle 20, and an electromagnetic rotating wheel 21 is mounted at the end of the baffle 20. The electromagnetic rotating wheel 21 receives signals from the visualization control console 15 via the connecting cable 11.

[0037] The automatic gear shifting device 3 is installed below the downshift, pause, and upshift three-gear switch 6; electromagnets 22, 23, 24, 25, and 26 are respectively connected to the pause switch, the upshift first gear switch, the upshift second gear switch, the upshift third gear switch, and the reverse gear switch. An electromagnet 27 is placed in the neutral position at one end of the pipe below the gear switches, and the other end is connected to a fixed electromagnet 29. A energized solenoid coil 28 is connected to electromagnet 29.

[0038] When the automatic shifting device automatically shifts gears, its working principle is as follows: the depth measuring instrument 19 detects the running speed and depth of the pile driver and transmits this information to the visualization control console 15. The visualization control console 15 converts the signal into current flowing through the energized solenoid 28 on the automatic shifting device 3. The different magnetic fields generated by the different currents attract the electromagnets 27 in the pipeline, which are automatically attracted by the electromagnets at each gear position and press the switch.

[0039] A method for automatically retracting the gear of a piling machine includes the following steps: Step 1: Install the depth measuring instrument 19 on the lifting mechanism of the piling machine. Secure the depth measuring instrument 19 with welding rods or steel bars, ensuring that both the lifting mechanism and the depth measuring instrument 19 move simultaneously. After securing, initiate the mechanical calibration operation. The accuracy of the depth measuring instrument 19 can be verified by manually inputting a known depth value or by utilizing the actual movement of the piling machine. If there is a deviation, reinstallation is required. Step 2: Remove the mechanical components connecting the reverse gear and clutch assembly. Connect the depth measuring instrument 19 and the automatic shifting device 3 to the visual automatic control console 15. The visual automatic control console 15 is connected to the solenoid directional valve 16 via the connecting cable 11. Install the hydraulic cylinder 12 on the outside of the reverse gear and clutch gear, and connect the hydraulic pump 13 to the main oil circuit 14. Connect the overflow valve 17, the solenoid directional valve 16, and the hydraulic cylinder 18. Step 3: Turn on the power switch on the visual automatic control console 15 and set the required pile length, drilling speed, and lifting speed, among other relevant parameters. As the drilling rig runs and continues to drill, the measuring instrument will feed back information to the automatic control console 15. The automatic control console 15 will continuously increase the current I in the energized solenoid 28 according to the speed change, thereby altering the magnetic induction intensity B. The magnetic induction intensity B of a single current loop of the energized solenoid in the electromagnet 29 in space is: ; In the formula, I is the current in the coil. Let be the vacuum permeability, and r be the vector from point A to the infinitesimal element on the ring.

[0040] Electromagnet 27 moves towards electromagnet 29 due to its attraction and is then attracted to electromagnet 22 in the forward gear. The gear lever also automatically engages due to the magnetic attraction. Since there is a considerable distance between electromagnets 29 and 27, we consider the electromagnets as magnetic dipoles, and the attractive force they generate is: ; In the formula, k is an empirical coefficient. The permeability of free space, Let m = NIS be the magnetic moment of the two electromagnets, and d be the distance between the centers of the two magnets.

[0041] Since electromagnets 22 and 27 will be in contact with each other at a very small distance, we can simplify the model to represent their attractive force as follows: ; In the formula, S is the area of ​​the cross-section of the magnet. The permeability of free space, denoted as magnetic flux density.

[0042] The maximum static friction force f it experiences is: ; In the formula, is the coefficient of friction.

[0043] When the speed reaches a certain value, that is, when I in the energized solenoid 28 increases to a certain value, the attractive force on the electromagnet 27 is greater than the maximum static friction force f, that is: ; Thus, it leaves gear 1 and is attracted to gear 2, and the gear lever is automatically engaged in gear 2 due to the attraction of the magnet.

[0044] Step 4: The visual automatic control console 15 sends an electrical signal to the solenoid directional valve 16 to control the solenoid rotating wheel 21, which in turn rotates the baffle 20 by a certain angle, thereby controlling the oil volume and direction in the oil pipe. The rotation angle of the baffle 20 at this time is... Its rotation angle (like Figure 3 (As shown) and the pipe cross-sectional area A satisfy: ; In the formula, R is the radius of the tubing.

[0045] According to the flow calculation formula: ; In the formula, V is the gasoline flow rate in the oil pipe.

[0046] The amount of gasoline flowing into the cylinder can be calculated, thereby controlling the drilling and lifting rate.

[0047] Step 5: After the pile body is formed, the depth measuring instrument 19 will send feedback to the visual automatic control console 15. The DC power supply of the visual automatic control console 15 will generate a specified current I, causing the electromagnet 27 to move to the reverse gear magnet, thus automatically engaging reverse gear. Simultaneously, the visual automatic control console 15 controls the electromagnetic reversing valve 16 to switch and adjust the angle. Achieve automatic drill bit lifting; Step 6: After the drill bit is raised to the initial position, the visual automatic control console 15 will display that the work is completed and turn off the DC power supply. The current I is 0. The electromagnet 29 loses its magnetic force, so the electromagnet 27 automatically resets under the action of gravity. Example 2: Based on Example 1, the energized solenoid 28 and electromagnet 29 generate a traction force on 27, causing electromagnet 27 to move obliquely upward. During the movement, the tactile switch 33 is triggered first. At this time, the electromagnetic plate 2710 at the bottom of the telescopic platform 2706 corresponding to the top electromagnet 22 is de-energized, allowing the metal top plate 2703 to be pressed down and moved directly below the electromagnet 22. At the same time as the tactile switch 33 is triggered, the corresponding electromagnet 22 is energized and attracted, causing the metal top plate 2703 and electromagnet 27 to be attracted to the bottom of the electromagnet 22. At the same time, the electromagnet 29 is de-energized. That is, the trigger signal of the tactile switch 33 is fed back to the back-end terminal, and the back-end terminal controls the above-mentioned electromagnetic plate 2710, electromagnet 22 and electromagnet 29 to be de-energized. When further movement to electromagnet 23 is required, the operator restarts electromagnet 29 to increase the current, causing electromagnet 27 to resist the attraction of electromagnet 22 and shift slightly to one side. This triggers tactile switch 34, de-energizing electromagnet 22 and causing it to lose its attraction. This allows electromagnet 27 to quickly move to the bottom of electromagnet 23. During this movement, the above steps are repeated, first triggering the tactile switch 33 at the bottom of electromagnet 23, and then operating in the same manner. The entire process utilizes controlled magnetic force to engage the gear, avoiding the problem of ambiguity in actual magnetic force. Factors such as distance, attraction, tilt angle, and object mass can all affect the accurate gear switching between electromagnets 22 and 26, requiring high precision and incurring high costs. However, the structure of embodiment two can reduce the precision standard while controlling magnetic force through structural design without affecting the accurate engagement of the gear, thus reducing costs and facilitating operation with a high degree of automation, without requiring additional manual labor.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A roadbed mixing pile construction device with automatic gear shifting, comprising a visual control console (15) and a depth measuring instrument (19), characterized in that, The visualization control console (15) is connected to the electromagnetic reversing valve (16) via a connecting line (11). A baffle (20) is installed in the middle of the electromagnetic reversing valve (16), and an electromagnetic rotating wheel (21) is installed at the end of the baffle (20). The electromagnetic rotating wheel (21) receives signals from the visualization control console (15) via the connecting line (11). The depth measuring instrument (19) is installed on the lifting mechanism of the mixing pile construction equipment and is connected to the visualization control console (15) via a connecting line. A hydraulic cylinder (12) is installed on the outside of the reverse gear and clutch gear. One end of the oil pump (13) is connected to the main oil pipe (14). The overflow valve (17) and the electromagnetic reversing valve (16) are both connected to the hydraulic cylinder (18).

2. The roadbed mixing pile construction equipment with automatic gear return as described in claim 1, characterized in that: The visual control console (15) includes a display screen (2) set on the main box of the console, a manual switching control knob (4), a speed control knob (5), a three-position switch for descent, pause and ascent (6), a manual control knob (7), and a tripod (8).

3. The roadbed mixing pile construction equipment with automatic gear return as described in claim 2, characterized in that: The tripod (8) has three legs that can be extended and fixed in length, and can be leveled. The turntable (10) can control the main box (1) of the visualization console to rotate around the axis of the device. The tripod (8) is connected to the main box (1) of the visualization console through three adjustable telescopic rods (9).

4. The method for raising a roadbed mixing pile construction device with automatic gear raising as described in claim 3, characterized in that: It also includes electromagnets 1 (22)-(27), energized solenoid coil (28) and electromagnet (29), the specific steps of which are as follows: S1. Install the depth measuring instrument (19) on the lifting mechanism of the pile driver and fix the depth measuring instrument (19) with welding rods or steel bars to ensure that the lifting mechanism of the pile driver and the depth measuring instrument (19) move at the same time. After fixing, start the mechanical calibration operation. The measurement accuracy of the depth measuring instrument (19) can be verified by manually inputting the known depth value or by using the actual movement of the pile driver. S2. Remove the mechanical structure parts connecting the reverse gear and clutch components, and connect the depth measuring instrument (19) and automatic shifting device (3) to the visual automatic control console (15). The visual automatic control console (15) is connected to the electromagnetic reversing valve (16) through the connecting line (11). S3. Turn on the power switch on the visual automatic control console (15) and set the required pile length, drilling speed and lifting speed parameters. As the drilling rig runs and drills down, the measuring instrument will feed back information to the automatic control console (15). The automatic control console (15) will continuously increase the current I in the energized solenoid (28) according to the speed change, thereby changing the magnetic induction intensity B. S4. The visual automatic control console (15) will send an electrical signal to the electromagnetic reversing valve (16) to control the electromagnetic rotating wheel (21) to drive the baffle (20) to rotate a certain angle, thereby controlling the amount and direction of oil in the oil pipe; S5. The transmitting device (31) in the depth measuring instrument (19) continuously emits laser light, which is captured by the receiving device (30) to obtain the propagation time and tilt angle. The formula for calculating the distance is: S = kvt / 2; In the formula, V is the speed of light in air, k is the distance coefficient, and t is the propagation time; S6. After the pile body is formed, the depth measuring instrument (19) will feed back to the visual automatic control console (15). The DC power supply of the visual automatic control console (15) will generate a specified current I, so that the electromagnet (27) moves to the reverse gear magnet, realizing automatic reverse gear engagement; at the same time, the visual automatic control console (15) controls the electromagnetic reversing valve (16) to reverse and adjust the included angle to realize automatic drill bit lifting. S7. When the drill bit is raised to the initial position, the visual automatic control console (15) will display that the work is completed and the DC power supply is turned off, and the current I is 0; the electromagnet (29) loses its magnetic force, so the electromagnet (27) automatically resets under the action of gravity.

5. The method for raising a roadbed mixing pile construction device with automatic gear raising as described in claim 4, characterized in that: The electromagnets 1 (22)-(27), the energized solenoid (28) and the electromagnet (29) are all mounted on the outer shell (35) and the bottom of the outer shell (35) is inclined upward. The electromagnet 1 (27) is slidably mounted inside the outer shell (35) and slides upward along the slide rail (32) along the slope due to the attraction generated by the energized solenoid (28) and the electromagnet (29). A tactile switch 2 (34) is provided on the sliding path of the electromagnet 1 (27) at the bottom of each electromagnet 1 (22)-(26). Multiple tactile switches 1 (33) are respectively provided on the slide rail (32) directly below the electromagnet 1 (22)-(26) and each tactile switch 1 (33) is offset to the lower side.

6. The method for raising a roadbed mixing pile construction device with automatic gear raising as described in claim 5, characterized in that: Except for electromagnet one (27), the other electromagnets one (22)-(26) are all pure electromagnets. Electromagnet one (27) includes a slider (2705) that is slidably connected to the slide rail (32). The slider (2705) is provided with a metal top plate (2703) for triggering multiple tactile switches two (34). The middle part of the slider (2705) is provided with multiple telescopic platforms (2706) arranged in a bamboo-like manner. Except for the top telescopic platform (2706), the other telescopic platforms (2706) are all A groove (2709) is provided to support the telescopic platform (2706) on its top. The groove (2709) is provided with a second spring (2708) for elastic compression and an electromagnetic plate (2710) for generating repulsive force to form support. Each of the telescopic platforms (2706) is provided with a third tactile switch (2707) and a fourth tactile switch (2711). The metal top plate (2703) and the slider (2705) are elastically connected by a spring (2701) and a guide rod (2702).

7. The method for raising a roadbed mixing pile construction device with automatic gear raising as described in claim 4, characterized in that: The magnetic induction intensity B of the single current loop of the energized solenoid in S3 in space is: ； In the formula, I is the current in the coil. Let be the vacuum permeability, r be the vector from point A to the infinitesimal element on the ring, and k be the magnetic flux density parameter.

8. The method for raising a roadbed mixing pile construction device with automatic gear raising as described in claim 4, characterized in that: The rotation angle of the baffle (20) in S4 at this time is Its rotation angle The pipe cross-sectional area A satisfies: ； In the formula, R is the radius of the tubing; According to the flow calculation formula: ； In the formula, V is the gasoline flow velocity in the oil pipe, and k is the flow coefficient. The amount of gasoline flowing into the cylinder can be calculated, thereby controlling the drilling and lifting rate.

9. The method for raising a roadbed mixing pile construction device with automatic gear raising as described in claim 4, characterized in that: S5 also includes using the cosine theorem to determine the drilling depth of the piling machine. Its depth calculation formula: ； In the formula, k is a correction coefficient, and c is the drilling depth. For two distance measurements, This represents the difference in tilt angle between the two tilt angles.

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