A drilling device for water conservancy construction

Abstract

The invention relates to the technical field of drilling equipment, and in particular to a drilling device for water conservancy construction, which is used to solve the problems of low efficiency of a single rotary drilling method and inconvenience of manually changing the drilling method; the device comprises a drilling mechanism and a speed regulating mechanism, the drilling mechanism comprises a drill bit and a hydraulic rod for driving the drill bit to dive, and a motor for driving the drill bit to rotate; the speed regulating mechanism comprises an oil inlet pipe and an oil outlet pipe connected to the hydraulic rod, the oil inlet pipe is connected to an adjusting pipe, the adjusting pipe is connected to a piston cylinder, and a piston rod is slidably connected in the piston cylinder, when the diving resistance of the drill bit increases, hydraulic oil flows into the piston cylinder so that the piston rod has a tendency to slide outward, and the motor drives the piston rod to slide back and forth on the piston cylinder, so that the hydraulic rod drives the drill bit to rotate and impact the formation; the device can adaptively adjust the drilling mode according to the hardness of the formation, perform single rotary drilling for softer formations, and automatically change to impact rotary drilling for harder formations.

Description

Technical Field

[0001] The invention relates to the technical field of drilling devices, in particular to a drilling device used for water conservancy construction. Background Art

[0002] In the field of water conservancy construction, drilling equipment is an indispensable tool, mainly used for exploring groundwater resources, geological structure analysis, and providing basic data for various water conservancy projects. Most traditional drilling equipment uses a single drilling method, such as driving the drill bit to dive through a hydraulic rod and relying on the rotation of the drill bit to break the stratum. However, when facing hard strata, especially high-strength geological structures such as rock strata, the single rotary drilling method is often inefficient and easily causes severe wear and even damage to the drill bit.

[0003] Although there are devices in the prior art that can change the drilling mode, the change of the drilling mode usually relies on manual adjustment by manually observing the drilling data, which is relatively inconvenient. Summary of the invention

[0004] The invention provides a drilling device for water conservancy construction, so as to solve the problems that a single rotary drilling method is inefficient and it is inconvenient to manually change the drilling method.

[0005] In order to alleviate the above technical problems, the technical solution provided by the present invention is:

[0006] A drilling device for water conservancy construction, comprising a drilling mechanism and a speed regulating mechanism, wherein the drilling mechanism comprises a drill bit, a hydraulic rod for driving the drill bit to dive, and a motor for driving the drill bit to rotate;

[0007] The speed regulating mechanism includes an oil inlet pipe and an oil outlet pipe connected to the hydraulic rod, the oil inlet pipe is connected to an adjusting pipe, the adjusting pipe is connected to a piston cylinder, a piston rod is slidably connected in the piston cylinder, when the diving resistance of the drill bit increases, hydraulic oil flows into the piston cylinder so that the piston rod has a tendency to slide outward, the motor drives the piston rod to slide reciprocatingly in the piston cylinder, so that the hydraulic rod drives the drill bit to rotate and impact the formation.

[0008] Furthermore, the speed regulating mechanism also includes a rack connected to the end of the piston rod, and the rack is provided with an inclination angle at one end close to the piston rod. The drilling mechanism is provided with a first pressure-sensitive switch for controlling the motor speed. When the rack slides away from the piston cylinder, the pressure on the first pressure-sensitive switch is released, thereby reducing the motor speed.

[0009] Furthermore, a piston plate is slidably connected in the piston cylinder, the piston rod is connected to the piston plate, and a tension spring is connected between the piston plate and the piston cylinder.

[0010] Furthermore, the drilling mechanism also includes a first gear and a second gear meshing with the first gear, the first gear is connected to the output end of the motor, the drill key slides in the middle of the second gear, and the drill is rotatably connected to the output end of the hydraulic rod.

[0011] Furthermore, the speed regulating mechanism further comprises a transmission tooth, the transmission tooth is meshed with the first gear, and the diameter of the transmission tooth is smaller than the first gear, and the rack can be meshed with the transmission tooth when sliding in a direction away from the piston cylinder.

[0012] Furthermore, the drilling mechanism also includes a drilling platform, an N-shaped frame and a bracket are connected to the table top of the drilling platform, the hydraulic rod and the motor are both connected to the bracket, and the N-shaped frame and the drilling platform are coaxially provided with a hole for the drill bit to pass through.

[0013] Furthermore, it also includes a pressurizing mechanism, which includes a counterweight block, and the counterweight block is connected to the upper part of the drilling mechanism. When the drill bit applies a downward impact force to the formation, the counterweight block moves upward quickly and creates an overweight state to apply pressure to the drilling mechanism.

[0014] Furthermore, the pressurizing mechanism includes an electric telescopic rod, the counterweight block is connected to the output end of the electric telescopic rod, and the N-shaped frame is connected to a second pressure-sensitive switch for controlling the extension and retraction of the electric telescopic rod. When the rack slides and presses the second pressure-sensitive switch, the electric telescopic rod slowly extends so that the counterweight block slowly moves downward, and when the rack moves away from the second pressure-sensitive switch, the electric telescopic rod quickly shortens so that the counterweight block quickly moves upward.

[0015] Furthermore, the N-shaped frame is connected to an L-shaped frame, and the electric telescopic rod is connected to the L-shaped frame.

[0016] Furthermore, two gravity blocks are symmetrically placed on both sides of the drilling mechanism, and pull ropes are connected between the two gravity blocks and the counterweight block.

[0017] The beneficial effects of the present invention are analyzed as follows:

[0018] A drilling device for water conservancy construction comprises a drilling mechanism and a speed regulating mechanism. The drilling mechanism comprises a drill bit, a hydraulic rod for driving the drill bit to dive, and a motor for driving the drill bit to rotate. The speed regulating mechanism comprises an oil inlet pipe and an oil outlet pipe connected to the hydraulic rod. The oil inlet pipe is connected to an adjusting pipe, and the adjusting pipe is connected to a piston cylinder. The piston cylinder is slidably connected with a piston rod. When the diving resistance of the drill bit increases, hydraulic oil flows into the piston cylinder so that the piston rod has a tendency to slide outward. The motor drives the piston rod to slide reciprocatingly on the piston cylinder, so that the hydraulic rod drives the drill bit to rotate and impact the formation.

[0019] When the drill bit drills into a hard formation, such as a rock formation, the drill bit's dive is blocked, so the resistance of the hydraulic oil entering the hydraulic rod increases, which in turn increases the pressure of the hydraulic oil. At this time, the hydraulic oil enters the piston cylinder through the adjusting tube. At this time, the piston rod in the piston cylinder extends outward. After the piston rod is extended, it is within the driving range of the motor. At this time, the motor drives the piston rod to slide into the piston cylinder, so that the hydraulic oil in the piston cylinder flows out of the piston cylinder and enters the hydraulic rod. Then the piston rod leaves the driving range of the motor, and the resistance of the formation to the drill bit causes the piston rod to extend again. This reciprocating process allows the drill bit to impact the formation while rotating and drilling, thereby improving the drilling effect on hard formations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the drilling mechanism of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the motor of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the speed regulating mechanism of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the pressurizing mechanism of the present invention.

[0026] icon:

[0027] 100, drilling mechanism; 110, drilling platform; 120, N-shaped frame; 121, bracket; 130, hydraulic rod; 140, drill bit; 150, motor; 160, first gear; 170, second gear; 200, speed regulating mechanism; 210, oil inlet pipe; 220, oil outlet pipe; 230, regulating pipe; 240, piston cylinder; 241, piston plate; 242, piston rod; 243, rack; 244, tension spring; 245, transmission gear; 250, first pressure-sensitive switch; 251, inclination; 300, pressurizing mechanism; 310, L-shaped frame; 320, electric telescopic rod; 330, counterweight; 340, pull rope; 350, gravity block; 360, second pressure-sensitive switch. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Examples, such as Figure 1-Figure 5 As shown, a drilling device for water conservancy construction includes a drilling mechanism 100 and a speed regulating mechanism 200. The drilling mechanism 100 includes a drill bit 140, a hydraulic rod 130 for driving the drill bit 140 to dive, and a motor 150 for driving the drill bit 140 to rotate; the speed regulating mechanism 200 includes an oil inlet pipe 210 and an oil outlet pipe 220 connected to the hydraulic rod 130, the oil inlet pipe 210 is connected to an adjusting pipe 230, the adjusting pipe 230 is connected to a piston cylinder 240, and a piston rod 242 is slidably connected in the piston cylinder 240. When the diving resistance of the drill bit 140 increases, hydraulic oil flows into the piston cylinder 240 so that the piston rod 242 has a tendency to slide outward, and the motor 150 drives the piston rod 242 to slide reciprocatingly on the piston cylinder 240, so that the hydraulic rod 130 drives the drill bit 140 to rotate and impact the formation.

[0032] The working mechanism of the drilling device provided in this embodiment is as follows:

[0033] When in use, the drilling mechanism 100 is moved to the desired drilling position, and the motor 150 is first started to drive the drill bit 140 to rotate, and then the hydraulic rod 130 is started to drive the drill bit 140 to dive to drill the formation. The hydraulic rod 130 is driven by an oil pump, and the oil pump pumps hydraulic oil into the hydraulic rod 130 through the oil inlet pipe 210 to extend the hydraulic rod 130, and pumps the hydraulic oil out through the oil outlet pipe 220 to shorten the hydraulic rod 130, so that the drill bit 140 can rise and dive. When the drill bit 140 drills into a hard formation, such as a rock formation, the drill bit 140 is blocked from diving, so that the resistance of the hydraulic oil entering the hydraulic rod 130 increases, thereby causing the hydraulic oil to The pressure increases, and the hydraulic oil enters the piston cylinder 240 through the regulating tube 230. At this time, the piston rod 242 in the piston cylinder 240 extends outward. After the piston rod 242 is extended, it is in the driving range of the motor 150. At this time, the motor 150 drives the piston rod 242 to slide into the piston cylinder 240, so that the hydraulic oil in the piston cylinder 240 flows out of the piston cylinder 240 and enters the hydraulic rod 130. Then the piston rod 242 leaves the driving range of the motor 150, and the resistance of the formation to the drill bit 140 causes the piston rod 242 to extend again. In this reciprocating manner, the drill bit 140 impacts the formation while rotating and drilling, thereby improving the drilling effect on the hard formation.

[0034] Among the optional methods of this embodiment, the more preferred ones are:

[0035] The speed regulating mechanism 200 also includes a rack 243 connected to the end of the piston rod 242. The rack 243 is provided with an inclination angle 251 at one end close to the piston rod 242. The drilling mechanism 100 is provided with a first pressure-sensitive switch 250 for controlling the rotation speed of the motor 150. When the rack 243 slides in a direction away from the piston cylinder 240, the squeezing of the first pressure-sensitive switch 250 is released, thereby reducing the rotation speed of the motor 150.

[0036] The rack 243 is connected to the end of the piston rod 242, and drives the rack 243 to move synchronously when the piston rod 242 slides. At this time, the rack 243 is away from the first pressure-sensitive switch 250, so that the first pressure-sensitive switch 250 is not under pressure. At this time, the first pressure-sensitive switch 250 controls the speed of the motor 150 to reduce, and then the speed of the drill bit 140 is reduced, so that the wear of the drill bit 140 when drilling into the hard formation is reduced. The motor 150 is connected to a frequency converter or a speed regulator, and the first pressure-sensitive switch 250 controls the frequency converter or the speed regulator to reduce the speed of the motor 150 while increasing the torque, so that the drill bit 140 can have sufficient torque to drill into the hard formation. When the rack 243 returns, the setting of the inclination angle 251 enables the first pressure-sensitive switch 250 to be gradually pressurized, while preventing the protruding first pressure-sensitive switch 250 from blocking the sliding reset of the rack 243.

[0037] Among the optional methods of this embodiment, the more preferred ones are:

[0038] A piston plate 241 is slidably connected inside the piston cylinder 240 , a piston rod 242 is connected to the piston plate 241 , and a tension spring 244 is connected between the piston plate 241 and the piston cylinder 240 .

[0039] The tension spring 244 and the piston plate 241 are arranged to provide a positive pressure environment for the piston cylinder 240, so that the hydraulic oil will not flow into the piston cylinder 240 when the drill bit 140 drills into the soft formation. Moreover, after the drill bit 140 drills through the hard formation, the tension spring 244 pulls the piston plate 241 to reset so that the rack 243 is reset, thereby restoring the rotation speed of the motor 150.

[0040] Among the optional methods of this embodiment, the more preferred ones are:

[0041] The drilling mechanism 100 also includes a first gear 160 and a second gear 170 meshing with the first gear 160 . The first gear 160 is connected to the output end of the motor 150 . The drill bit 140 slides in the middle of the second gear 170 , and the drill bit 140 is rotatably connected to the output end of the hydraulic rod 130 .

[0042] When the motor 150 is started, the first gear 160 rotates, and at this time, the first gear 160 drives the second gear 170 to rotate. Since the drill bit 140 is slidingly connected to the second gear 170 and is rotationally connected to the output end of the hydraulic rod 130, it is ensured that the drill bit 140 can be driven by the hydraulic rod 130 to dive while rotating.

[0043] Among the optional methods of this embodiment, the more preferred ones are:

[0044] The speed regulating mechanism 200 further includes a transmission tooth 245 , which meshes with the first gear 160 . The transmission tooth 245 has a diameter smaller than that of the first gear 160 . The rack 243 can mesh with the transmission tooth 245 when sliding in a direction away from the piston cylinder 240 .

[0045] The rack 243 is driven by the internal pressure of the piston cylinder 240 to move toward the transmission tooth 245, and the rack 243 is at a position away from the first pressure-sensitive switch 250 when meshing with the transmission tooth 245. When the transmission tooth 245 rotates, the rack 243 is driven to move toward the piston cylinder 240, and at this time, the movement of the rack 243 will not contact the first pressure-sensitive switch 250. At this time, the hydraulic oil is pumped by the oil pump and has a tendency to flow into the hydraulic rod 130. This tendency provides the rack 243 with a thrust to slide toward the transmission tooth 245, and the rotation of the transmission tooth 245 provides the rack 243 with a thrust to slide in the opposite direction. This thrust causes the piston plate 241 to slide toward the inside of the piston cylinder 240, thereby causing the pressure of the hydraulic oil to increase intermittently, and then causing the drill bit 140 to impact the formation, which is convenient for drilling into the hard formation.

[0046] The diameter of the transmission tooth 245 is smaller than the first gear 160, so that when the speed of the motor 150 is reduced, the speed transmitted to the transmission tooth 245 can still make the transmission tooth 245 drive the rack 243 to slide quickly, so as to ensure sufficient impact frequency applied to the drill bit 140;

[0047] If the rack 243 contacts the first pressure-sensitive switch 250 , it means that the tension of the tension spring 244 is greater than the pressure of the hydraulic oil, and the formation hardness has decreased at this time.

[0048] Among the optional methods of this embodiment, the more preferred ones are:

[0049] The drilling mechanism 100 also includes a drilling platform 110, on the surface of which an N-shaped frame 120 and a bracket 121 are connected. The hydraulic rod 130 and the motor 150 are both connected to the bracket 121. The N-shaped frame 120 and the drilling platform 110 are coaxially provided with a hole for the drill bit 140 to pass through.

[0050] The coaxial holes on the drilling platform 110 and the N-shaped frame 120 ensure the drilling verticality of the drill bit 140, and the arrangement of the bracket 121 enables the hydraulic rod 130 and the motor 150 to be installed and fixed.

[0051] Specifically, the pressurizing mechanism 300 includes:

[0052] The pressurizing mechanism 300 includes a counterweight block 330 , which is connected to the upper part of the drilling mechanism 100 . When the drill bit 140 applies a downward impact force to the formation, the counterweight block 330 moves upward quickly and creates an overweight state to apply pressure to the drilling mechanism 100 .

[0053] Since the drill bit 140 exerts a reaction force on the drilling mechanism 100 when impacting the formation, this reaction force makes the drilling mechanism 100 tend to move upward, and then when the drill bit 140 impacts the formation downward, the counterweight block 330 moves upward quickly and is in an overweight state. The counterweight block 330 in the overweight state exerts downward pressure on the drilling mechanism 100, thereby ensuring the stability of the drilling mechanism 100.

[0054] Among the optional methods of this embodiment, the more preferred ones are:

[0055] The pressurizing mechanism 300 includes an electric telescopic rod 320, a counterweight 330 is connected to the output end of the electric telescopic rod 320, and a second pressure-sensitive switch 360 for controlling the extension and retraction of the electric telescopic rod 320 is connected to the N-shaped frame 120. When the rack 243 slides and presses the second pressure-sensitive switch 360, the electric telescopic rod 320 slowly extends so that the counterweight 330 slowly moves downward, and when the rack 243 moves away from the second pressure-sensitive switch 360, the electric telescopic rod 320 quickly shortens so that the counterweight 330 quickly moves upward.

[0056] When the rack 243 slides and meshes with the transmission tooth 245, the end of the rack 243 can be squeezed on the second pressure-sensitive switch 360. At this time, the hydraulic oil in the piston cylinder 240 does not flow into the hydraulic rod 130, that is, the drill bit 140 does not impact the formation at this time. Therefore, when the second pressure-sensitive switch 360 is pressurized, the electric telescopic rod 320 is controlled to extend slowly, so that the counterweight block 330 moves down slowly to ensure that the weightless state of the counterweight block 330 is lighter. When the rack 243 is away from the second pressure-sensitive switch 360, the electric telescopic rod 320 is quickly shortened, so that the counterweight block 330 moves up quickly to produce an overweight state and exert pressure on the drilling mechanism 100.

[0057] Among the optional methods of this embodiment, the more preferred ones are:

[0058] The N-shaped frame 120 is connected to an L-shaped frame 310 , and the electric telescopic rod 320 is connected to the L-shaped frame 310 .

[0059] The upper horizontal section of the L-shaped frame 310 extends to the top of the center of gravity of the drilling mechanism 100 and is connected to the electric telescopic rod 320 , so that the counterweight block 330 can evenly apply pressure to the drilling mechanism 100 .

[0060] Among the optional methods of this embodiment, the more preferred ones are:

[0061] Two gravity blocks 350 are symmetrically placed on both sides of the drilling mechanism 100 , and a pull rope 340 is connected between the two gravity blocks 350 and the counterweight block 330 .

[0062] The gravity blocks 350 are symmetrically arranged on both sides of the drilling mechanism 100 and connected to the counterweight block 330 through the pull rope 340. The pull rope 340 is slightly elastic. When the counterweight block 330 moves up quickly and becomes overweight, the gravity blocks 350 pull the counterweight block 330 through the pull rope 340, further applying downward pressure to the drilling mechanism 100. The elastically arranged pull rope 340 also prevents the counterweight block 330 from being interfered with in its upward movement.

[0063] The gravity block 350 is not fixedly connected to the entire device, which facilitates the transfer and transportation of the entire device.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drilling device for water conservancy construction, characterized in that: The invention comprises a drilling mechanism (100) and a speed regulating mechanism (200), wherein the drilling mechanism (100) comprises a drill bit (140), a hydraulic rod (130) for driving the drill bit (140) to dive, and a motor (150) for driving the drill bit (140) to rotate; The speed regulating mechanism (200) comprises an oil inlet pipe (210) and an oil outlet pipe (220) connected to the hydraulic rod (130); the oil inlet pipe (210) is connected to an adjusting pipe (230); the adjusting pipe (230) is connected to a piston cylinder (240); a piston rod (242) is slidably connected inside the piston cylinder (240); when the diving resistance of the drill bit (140) increases, hydraulic oil flows into the piston cylinder (240) so that the piston rod (242) has a tendency to slide outwards; the motor (150) drives the piston rod (242) to slide reciprocatingly on the piston cylinder (240), so that the hydraulic rod (130) drives the drill bit (140) to rotate and impact the formation; The speed regulating mechanism (200) further comprises a rack (243) connected to the end of the piston rod (242); an end of the rack (243) close to the piston rod (242) is provided with an inclination angle (251); a first pressure-sensitive switch (250) for controlling the rotation speed of the motor (150) is provided on the drilling mechanism (100); when the rack (243) slides in a direction away from the piston cylinder (240), the squeezing of the first pressure-sensitive switch (250) is released, thereby reducing the rotation speed of the motor (150); A piston plate (241) is slidably connected inside the piston cylinder (240), the piston rod (242) is connected to the piston plate (241), and a tension spring (244) is connected between the piston plate (241) and the piston cylinder (240); The drilling mechanism (100) further comprises a first gear (160) and a second gear (170) meshing with the first gear (160); The speed regulating mechanism (200) further comprises a transmission tooth (245), the transmission tooth (245) meshing with the first gear (160), and the diameter of the transmission tooth (245) is smaller than that of the first gear (160), and the rack (243) can mesh with the transmission tooth (245) when sliding in a direction away from the piston cylinder (240).

2. The drilling device for water conservancy construction according to claim 1, characterized in that: The first gear (160) is connected to the output end of the motor (150), the drill bit (140) is key-slidably connected to the middle of the second gear (170), and the drill bit (140) is rotationally connected to the output end of the hydraulic rod (130).

3. The drilling device for water conservancy construction according to claim 2, characterized in that: The drilling mechanism (100) further comprises a drilling platform (110), the surface of the drilling platform (110) being connected to an N-shaped frame (120) and a bracket (121), the hydraulic rod (130) and the motor (150) being connected to the bracket (121), and a hole for allowing a drill bit (140) to pass through being coaxially formed on the N-shaped frame (120) and the drilling platform (110).

4. The drilling device for water conservancy construction according to claim 3 is characterized in that: It also includes a pressurizing mechanism (300), the pressurizing mechanism (300) including a counterweight (330), the counterweight (330) being connected to the upper portion of the drilling mechanism (100), and when the drill bit (140) applies a downward impact force to the formation, the counterweight (330) moves upward quickly and creates an overweight state to apply pressure to the drilling mechanism (100).

5. The drilling device for water conservancy construction according to claim 4, characterized in that: The pressurizing mechanism (300) comprises an electric telescopic rod (320), the counterweight (330) being connected to an output end of the electric telescopic rod (320), and a second pressure-sensitive switch (360) for controlling the extension and retraction of the electric telescopic rod (320) being connected to the N-shaped frame (120); when the rack (243) slides and presses the second pressure-sensitive switch (360), the electric telescopic rod (320) slowly extends so that the counterweight (330) slowly moves downward, and when the rack (243) moves away from the second pressure-sensitive switch (360), the electric telescopic rod (320) quickly shortens so that the counterweight (330) quickly moves upward.

6. The drilling device for water conservancy construction according to claim 5, characterized in that: The N-shaped frame (120) is connected to an L-shaped frame (310), and the electric telescopic rod (320) is connected to the L-shaped frame (310).

7. The drilling device for water conservancy construction according to claim 6, characterized in that: Two gravity blocks (350) are symmetrically placed on both sides of the drilling mechanism (100), and a pull rope (340) is connected between the two gravity blocks (350) and the counterweight block (330).

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