A rotary drilling rig for drilling holes in building pile foundations

Abstract

The present invention relates to the technical field of rotary drilling rig equipment, and specifically to a rotary drilling rig for drilling holes for building pile foundations. A rotary drilling rig for drilling holes for building pile foundations comprises a drilling rig body, a boom, a transmission rod and a drill barrel. The drill barrel is detachably mounted on the transmission rod through a limit assembly. The limit assembly comprises a limit state and a free state. When in the limit state, the drill barrel and the transmission rod move synchronously. When in the free state, the drill barrel and the transmission rod can move relative to each other. The rotary drilling rig for drilling holes for building pile foundations provided by the present invention is used to solve the problem that the existing rotary drilling rigs are not easy to extract soil due to the deep excavation depth and the long boom.

Description

Technical Field

[0001] The invention relates to the technical field of rotary drilling rig equipment, in particular to a rotary drilling rig used for drilling holes in building pile foundations. Background Art

[0002] The construction of cast-in-place piles by rotary drilling rigs is an advanced pile foundation construction technology that has developed rapidly in my country in recent years. The construction of rotary drilling rigs has many characteristics, such as fast hole-making speed, high hole-making quality, low noise, low environmental pollution, high degree of mechanization, and low labor intensity of workers. Whether it is an imported drilling rig or a domestic drilling rig, the structural form and working principle are similar, but the strata under construction vary greatly, and the specific construction technical requirements are different.

[0003] During the pile foundation construction of roads, bridges and large infrastructure, the drilling depth is very deep, so the boom of the rotary drilling rig must be long enough to allow the drill tube to complete the work smoothly. This results in the rotary drilling rig being large in size, high in cost, low in work efficiency, and high in requirements for the working terrain, which cannot meet the high efficiency and high quality requirements of modern construction. Summary of the invention

[0004] The invention provides a rotary drilling rig for drilling holes in building pile foundations, which is used to solve the problem that the existing rotary drilling rigs are difficult to obtain soil due to their deep excavation depth and long suspension arms.

[0005] The rotary drilling rig for drilling holes in building pile foundations of the present invention adopts the following technical scheme:

[0006] A rotary drilling rig for drilling holes for building pile foundations comprises a body, a boom, a first driving device, a transmission rod, and a drill barrel, wherein the first driving device moves along the boom; the first driving device drives the transmission rod to rotate; the drill barrel is detachably mounted on the transmission rod through a limit assembly; the drill barrel rotates synchronously with the transmission rod; a through hole is provided on the drill barrel, the through hole penetrates the drill barrel along the axial direction of the drill barrel, and the transmission rod is inserted into the through hole.

[0007] Furthermore, it also includes a winding device, which includes a winding part and a steel cable. The winding device drives the steel cable to move, and the steel cable drives the drill tube to move. The winding device rotates together with the transmission rod.

[0008] Furthermore, it also includes a limiting component, which includes a limiting state and a free state. When in the limiting state, the drill barrel and the transmission rod move synchronously, and when in the free state, the drill barrel and the transmission rod can move relative to each other.

[0009] Furthermore, the limit assembly includes a limit groove, a sliding limit block and an elastic member; the elastic force of the elastic member always makes the sliding limit block close to the transmission rod or has a tendency to approach the transmission rod, and the sliding limit block slides in the limit groove; when in the free state, the steel cable overcomes the elastic force of the elastic member, so that the sliding limit block is away from the transmission rod; when in the limited state, the elastic member pushes the sliding limit block, and the sliding limit block abuts against the transmission rod.

[0010] Furthermore, the rotary drilling rig also includes an extension rod, the number of the extension rod is one, the extension rod has a first end and a second end, the first end is fixedly connected to the transmission rod, and the second end is detachably connected to the first drive device; the first drive drives the extension rod to move.

[0011] Furthermore, there are multiple extension rods, wherein the first end of the extension rod close to the transmission rod is fixedly connected to the transmission rod, the second end of the extension rod away from the transmission rod is detachably connected to the first driving device, and the first ends of the remaining extension rods are detachably connected to the second ends of the extension rods adjacent to them.

[0012] Furthermore, the length of the boom is greater than that of the extension rod.

[0013] Furthermore, there are a drill bit and a second limiting assembly, the drill bit is connected at a position far away from the first driving device, the drill bit has a third end and a fourth end, the third end is fixed to the transmission rod by a second limiting structure; the distance between the fourth end and the transmission rod is greater than the distance between the lower cover of the drill barrel and the transmission rod.

[0014] Furthermore, the second limiting assembly has a synchronous state and a separated state; in the synchronous state, the drill bit and the transmission rod rotate synchronously; in the separated state, the transmission rod and the drill bit can rotate relatively.

[0015] When the drilling speed of the drill barrel is greater than or equal to the drilling speed of the drill bit, the drill bit is in the synchronous state; when the drilling speed of the drill barrel is less than the drilling speed of the drill bit, the drill bit is in the separated state.

[0016] The beneficial effects of the present invention are:

[0017] A rotary drilling rig for drilling holes for building pile foundations provided in an embodiment of the present invention includes a body, a boom, a first drive device, a transmission rod, and a drill barrel. The first drive device moves along the boom, and the first drive device drives the transmission rod to rotate; the drill barrel is detachably mounted on the transmission rod through a limit assembly; the drill barrel rotates synchronously with the transmission rod; a through hole is provided on the drill barrel, the through hole penetrates the drill barrel along the axial direction of the drill barrel, and the transmission rod is inserted into the through hole.

[0018] After the drill barrel has excavated a certain depth, when it is necessary to take soil, the drill bit will separate from the transmission rod and rise alone to discharge the soil, and use the transmission rod in the drilling well as a positioning device, and then move into the drilling well and fix it with the transmission rod to work. This method reduces the work that the rotary drilling rig needs to do each time it takes soil, and alleviates the terrain restrictions caused by the need for a long boom in the prior art. At the same time, the positioning accuracy of the drill barrel when it is put back into the drilling well after taking soil is also guaranteed to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic structural diagram of a rotary drilling rig for drilling holes in building pile foundations provided by an embodiment of the present invention;

[0021] Figure 2 A front view of a rotary drilling rig for drilling holes in building pile foundations provided by an embodiment of the present invention;

[0022] Figure 3 for Figure 2 Sectional view along AA direction;

[0023] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0024] Figure 5 for Figure 3 Sectional view along CC direction;

[0025] Figure 6 for Figure 5 A cross-sectional view of the middle portion D;

[0026] Figure 7 A schematic diagram of the working state of a rotary drilling rig for drilling holes in building pile foundations provided by an embodiment of the present invention;

[0027] In the figure: 100, vehicle body; 101, vehicle frame; 102, moving unit; 103, first control unit; 104, first winding unit; 105, first steel cable;

[0028] 200, drilling component; 201, boom; 202, first drive device; 203, second winding unit; 204, second steel cable; 205, transmission rod; 206, drill tube; 2061, limit block slide groove; 2062, compression spring; 207, sliding limit block; 208, unlocking component; 209, drill bit; 210, shaft groove; 211, limit key; 212, extension rod. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is 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 a limitation to the present invention.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] A rotary drilling rig for drilling holes in building pile foundations provided in an embodiment of the present invention is mainly used for drilling operations when drilling holes in building pile foundations, and can also be used for drilling operations in other fields.

[0033] Specifically, Figures 1 to 7 As shown, the rotary drilling rig for drilling holes in building pile foundations provided by the present invention comprises:

[0034] The body 100 is the main body of the rotary drilling rig used for drilling holes for building pile foundations. It usually travels on a road surface or a stable plane. On the one hand, the body 100 serves as a bearing base for other accessory parts. On the other hand, the body 100 can drive other accessory parts to move. In this embodiment, the vehicle body 100 includes a frame 101 in the middle position, which is the installation basis of other parts; a moving unit 102 is arranged at the lower part of the vehicle body 100, and the moving unit 102 can drive the movement of the vehicle body 100 to meet different usage requirements; a first control unit 103 is arranged at the upper part of the vehicle body 100, and the first control unit 103 includes a plurality of hydraulic rods, and the first control unit 103 is rotatably connected to the boom 201 through the hydraulic rods, and the requirements of the boom 201 at different positions are met through the telescopic cooperation of the plurality of hydraulic rods; a first winding unit 104 is arranged at the upper part of the vehicle body 100, and a first steel cable 105 is wound around the first winding unit 104, one end of the first steel cable 105 is connected to the first winding unit 104, and the other end is connected to the first driving device 202; the first winding unit 104 can wind up or release the first steel cable 105, so as to control the movement of the first driving device 202.

[0035] The boom 201 is rotatably connected to the hydraulic rod of the first control unit 103 . The boom 201 is used to deliver some components to a high place, and the first control unit 103 is used to control the movement of the boom 201 .

[0036] The first driving device 202 is arranged on the boom 201, the first driving device 202 is connected to the first steel cable 105, the first driving device 202 is controlled by the first winding unit 104, and the first driving device 202 can slide along the length direction of the boom 201; the first driving device 202 is used to drive the transmission rod 205 to rotate.

[0037] The transmission rod 205 is detachably arranged on the first driving device 202, and is used to transmit the torque generated by the first driving device 202 to the drill barrel 206, driving the drill barrel 206 to rotate synchronously; the transmission rod 205 has a first end and a second end, the first end is connected to the first driving device 202, and the second end is connected to the drill barrel 206.

[0038] The drill barrel 206 is detachably connected to the second end of the transmission rod 205; the drill barrel 206 includes a barrel body, a bottom plate, a through hole and an unlocking assembly 208. There is a accommodating space inside the barrel body, and the accommodating space exchanges with external materials through the bottom plate and the gap between the bottom plate and the barrel body. The accommodating space inside the drill barrel 206 is used to store soil; the bottom plate is located at the bottom of the drill barrel 206, and the bottom plate is rotatably connected to the barrel body. The bottom plate has the function of drilling and sending the drilled soil into the internal accommodating space. The bottom plate can be opened and closed to store soil and release soil; the through hole penetrates the drill barrel 206 along the axial direction of the drill barrel 206, the drill barrel 206 and the transmission rod 205 rotate synchronously, the drill barrel 206 and the transmission rod 205 can slide relative to each other along the axial direction of the drill barrel 206, and the transmission rod 205 is arranged in the through hole; the unlocking assembly 208 is arranged on the barrel body to control the opening and closing of the bottom plate.

[0039] The rotary drilling rig has multiple states when working, including a drilling state and a soil discharge state. In the drilling state, the transmission rod 205 and the drill tube 206 rotate synchronously to perform drilling and digging work; in the soil discharge state, the transmission rod 205 and the drill tube 206 are separated, the transmission rod 205 remains in the well, and the drill tube 206 leaves the well to discharge soil.

[0040] Specifically, when there is no soil or less soil inside the drill tube 206 and the drill tube 206 is in the drilling state, the first winding unit 104 releases the first steel cable 105, so that the first driving device 202 slides on the boom 201, and the first driving device 202 drives the transmission rod 205 and the drill tube 206 to move toward the depth of the drilling well along the length direction of the boom 201. At the same time, the first driving device 202 drives the transmission rod 205 to rotate, and the transmission rod 205 and the drill tube 206 rotate synchronously. The drill tube 206 drills downward while filling the drilled soil into the drill tube 206. In the soil discharge state, the drill tube 206 moves upward, while the transmission rod 205 does not move, and then the drill tube 206 is separated from the limit of the transmission rod 205; then the frame 101 rotates, driving the boom 201 to move, and the boom 201 drives the drill tube 206 to move to the unloading position; then the drill tube 206 triggers the unlocking component 208, so that the bottom plate of the drill tube 206 is opened to discharge the soil.

[0041] When the soil inside the drill barrel 206 reaches a predetermined amount, the drilling component 200 enters a soil discharge state from a drilling state. At this time, the first winding unit 104 winds up the first steel cable 105, driving the first drive device 202 to move away from the drilling direction. The first drive device 202 stops rotating and drives the drill barrel 206 to move. At this time, the transmission rod 205 does not move, and the drill barrel 206 moves on the transmission rod 205. Finally, the drill barrel 206 is separated from the transmission rod 205, and then the drill barrel 206 completes the soil discharge work. When the soil in the drill barrel 206 is discharged, the drilling component 200 enters the drilling state from the soil discharge state, the frame 101 returns to the original position, the drill barrel 206 moves downward, and the drill barrel 206 is positioned by the limit of the transmission rod 205. After that, the drill barrel 206 is connected with the transmission rod 205, and the transmission rod 205 and the drill barrel 206 rotate synchronously; the drilling component 200 enters the soil discharge state from the drilling state, and then enters the drilling state from the soil discharge state. This process constitutes a working cycle, and the entire drilling operation has multiple cycles until the work is completed.

[0042] When the drill tube 206 moves upward to discharge soil, the transmission rod 205 does not move with the drill tube 206, which reduces the force required to lift the drill tube 206, thereby saving energy, reducing the requirement for the length of the boom 201, and reducing the overall size of the rotary drilling rig, saving costs.

[0043] In a further embodiment, Figure 1-Figure 4 As shown, a rotary drilling rig for drilling holes in building pile foundations also includes a winding device.

[0044] The winding device includes a second winding unit 203 and a second steel cable 204. The second winding unit 203 is located on the first driving device 202, and the second winding unit 203 is rotatably connected to the first driving device 202; one end of the second steel cable 204 is connected to the second winding unit 203, and the other end is connected to the drill pipe 206; the second winding unit 203 can wind up the second steel cable 204.

[0045] Specifically, in the drilling state, the first driving device 202 drives the transmission rod 205 to rotate, the second winding unit 203 and the transmission rod 205 rotate synchronously, and the second steel cable 204 and the transmission rod 205 rotate synchronously; in the soil discharge state, the second winding unit 203 reels the second steel cable 204, and the second steel cable 204 drives the drill barrel 206 to move, so that the drill barrel 206 approaches the second winding unit 203 along the direction of the transmission rod 205, and breaks away from the limit of the transmission rod 205 on the drill barrel 206, so that the drill barrel 206 can move to other areas to discharge soil.

[0046] When the drilling component 200 enters the soil discharge state from the drilling state, the second winding unit 203 winds up the second steel cable 204, drives the drill tube 206 to move upward, and after the drill tube 206 is separated from the transmission rod 205, the second winding unit 203 continues to wind up the second steel cable 204, so that the unlocking component 208 can contact the first driving device 202, thereby opening the bottom plate of the drill tube 206 for soil discharge. When the drilling component 200 enters the drilling state from the soil discharge state, the second winding unit 203 releases the second steel cable 204 and causes the drill tube 206 to descend.

[0047] In the drilling state, the second steel cable 204 and the transmission rod 205 rotate synchronously to avoid the second steel cable 204 being entangled on the transmission rod 205 during operation, and to avoid the second steel cable 204 being entangled on the transmission rod 205 in the soil discharge state, thereby preventing the lifting of the drill tube 206 from being hindered.

[0048] In a further embodiment, Figure 3-Figure 4 As shown, a rotary drilling rig for drilling holes for building pile foundations also includes a limiting component.

[0049] In order to meet the switching requirements of the drilling component 200 between the two states, a limit assembly is set in the area where the second end of the transmission rod 205 is connected to the drill barrel 206 through the hole, and the limit assembly has a limited state and a free state; the limited state of the limit assembly is to enable the transmission rod 205 to drive the drill barrel 206 to rotate synchronously, thereby completing the drilling operation; the free state of the limit assembly is to enable the drill barrel 206 to release the fixed relationship with the transmission rod 205, so that the drill barrel 206 can rise alone to complete the soil discharge work.

[0050] In a further embodiment, Figure 3-Figure 4 As shown, a rotary drilling rig for forming a hole for a building pile foundation, the limiting assembly includes: the limiting assembly includes a limiting block slide groove 2061, a compression spring 2062 and a sliding limiting block 207; the limiting block slide groove 2061 is located on the upper end surface of the drill tube 206, and the limiting block slide groove 2061 passes through the through hole of the drill tube 206 and can abut against the transmission rod 205; the limiting block slide groove 2061 has an inclined surface, and the direction of the inclined surface is perpendicular to the axis of the transmission rod 205 and away from the transmission rod 205 gradually away from the direction of the drill tube 206; the sliding limit block 207 is located inside the limit block slot 2061 and is slidably connected to the limit block slot 2061; one end of the compression spring 2062 is fixed on the limit block slot 2061, and the other end is fixed on the sliding limit block 207. The compression spring 2062 pushes the sliding limit block 207, so that the sliding limit block 207 has a tendency to move toward the transmission rod 205; the sliding limit block 207 is connected to the second steel cable 204.

[0051] When drilling, the second steel cable 204 is relaxed, and the sliding limit block 207 is subjected to the force of the compression spring 2062, so that the sliding limit block 207 abuts against the transmission rod 205, so that when the transmission rod 205 rotates, the sliding limit block 207 is driven to rotate, and the sliding limit block 207 drives the drill tube 206 to rotate. In the soil discharge state, the second steel cable 204 is reeled in by the second reeling unit 203, the second steel cable 204 is tightened, the transmission rod 205 does not move, and the second steel cable 204 pulls the sliding limit block 207 along the axial direction of the transmission rod 205. Under the action of the inclined surface between the sliding limit block 207 and the limit block slide groove 2061, the force of the second steel cable 204 along the axial direction of the transmission rod 205 is decomposed into a force perpendicular to the transmission rod 205 and away from the transmission rod 205. This force moves the sliding limit block 207 in a direction away from the transmission rod 205, so that the sliding limit block 207 no longer abuts against the transmission rod 205, and compresses the compression spring 2062. At this time, the transmission rod 205 and the drill barrel 206 can move relatively.

[0052] In the drilling state, the transmission rod 205 and the drill tube 206 move synchronously, and in the soil discharge state, the transmission rod 205 and the drill tube 206 move relatively; a limit assembly is arranged on the drill tube 206 to combine or separate the drill tube 206 and the transmission rod 205. In this way, the fixed relationship between the transmission rod 205 and the drill tube 206 can be switched remotely, and then the second steel cable 204 can also lift the drill tube 206 for soil discharge.

[0053] In one embodiment, if Figure 7 As shown, a rotary drilling rig for forming a hole for a building pile foundation also includes an extension rod 212. The extension rod 212 has a third end and a fourth end. The extension rod 212 is one, and the third end of the extension rod 212 is connected to the first drive device 202, and the fourth end is connected to the transmission rod 205. The extension rod 212 can increase the distance between the first drive device 202 and the drill tube 206, thereby increasing the drilling depth of the drilling operation. At the same time, the extension rod 212 is not connected to the first drive device 202 and the drill tube 206 at the beginning, but after a certain depth of excavation, when the drilling component 200 is in a soil discharge state, the extension rod 212 is fixed on the transmission rod 205. In this way, when performing soil discharge work, the boom 201 does not need to take the transmission rod 205 and the extension rod 212 out of the drilling well, and the length requirement of the boom 201 is reduced, so that the length of the boom 201 can be reduced, and then the size of the rotary drilling rig can be reduced.

[0054] In a further embodiment, in order to increase the drilling depth of the rotary drilling rig drilling operation, there are multiple extension rods 212. Among the multiple extension rods 212, the third end of the extension rod 212 close to the first driving device 202 is connected to the first driving device 202, and the fourth end of the extension rod 212 close to the transmission rod 205 is connected to the first end of the transmission rod 205; the third ends of the remaining extension rods 212 are connected to the fourth ends of the adjacent extension rods 212; the fourth ends of the remaining extension rods 212 are connected to the third ends of the adjacent extension rods 212. Specifically, in the drilling state, the first driving device 202 drives the extension rod 212 to rotate, the extension rod 212 drives the extension rod 212 to rotate; the extension rod 212 drives the transmission rod 205 to rotate; the transmission rod 205 drives the drill pipe 206 to rotate.

[0055] The extension rod 212 can increase the distance between the first driving device 202 and the drill tube 206, thereby increasing the drilling depth of the drilling operation. At the same time, the extension rod 212 is not connected to the first driving device 202 and the drill tube 206 at the beginning, but after a certain depth of excavation, when the drilling component 200 is in the soil discharge state, an extension rod 212 is fixed on the transmission rod 205, and in other working cycles, the extension rod 212 is installed in sequence. In this way, when performing soil discharge work, the boom 201 does not need to lift out the extension rod 212 and the transmission rod 205 together, but lifts out the drill tube 206 through the second winding unit 203 and the second steel cable 204, and the boom 201 does not need to take the transmission rod 205 and the extension rod 212 out of the drilling well, and the length requirement of the boom 201 is reduced. The use of multiple extension rods 212 can ensure that the drill tube 206 drills into the foundation pit to a sufficient depth, and can also reduce the length of the boom 201, thereby reducing the overall volume of the rotary drilling rig, reducing costs, and increasing the adaptability of the rotary drilling rig.

[0056] In a further embodiment, Figure 7 As shown, a rotary drilling rig for drilling holes for building pile foundations, the length of the boom 201 is greater than the length of the extension rod 212. Generally, the body 100 is arranged above the ground. When the transmission rod 205 is installed with the extension rod 212, for safety reasons, the connection area between the transmission rod 205 and the extension rod 212 should also be above the ground, and the length direction of the extension rod 212 should be consistent with the length direction of the boom 201. In order to meet the above-mentioned work requirements, the length of the extension rod 212 needs to be less than the length of the boom 201, so that when the rotary drilling rig is not drilling deep enough, the boom 201 can easily add a new extension rod 212.

[0057] In one embodiment, if Figure 2-Figure 6 As shown, a rotary drilling rig for drilling holes for building pile foundations also includes a drill bit 209 and a second limiting assembly.

[0058] The drill bit 209 has a fifth end and a sixth end, and the fifth end is connected to the fourth end of the transmission rod 205 through a second limiting assembly, and the second limiting assembly is arranged between the fourth end and the fifth end; the transmission rod 205 is connected to the drill bit 209, and the transmission rod 205 and the drill bit 209 are coaxial and rotate synchronously; the distance between the sixth end of the drill bit 209 and the transmission rod 205 is greater than the distance between the lower cover of the drill barrel 206 and the transmission rod 205, and the drill bit 209 passes through the center hole of the lower cover of the drill barrel 206, so that the drill bit 209 can drill deeper in the drilling direction of the drilling component 200, so as to fix the drill bit 209 and the transmission rod 205, so that the drill barrel 206 can return to its original position with high precision after discharging soil, thereby avoiding the phenomenon of hole expansion and hole collapse due to low precision after the drill barrel 206 is reset after discharging soil.

[0059] In a further embodiment, Figure 2-Figure 6 As shown, a rotary drilling rig for drilling holes for building pile foundations, the second limit assembly consists of an axis groove 210 and a limit key 211; the second limit assembly has a synchronous state and a separated state; in the synchronous state, the transmission rod 205 and the drill bit 209 rotate synchronously; in the separated state, the transmission rod 205 and the drill bit 209 can rotate relative to each other. Specifically, the shaft groove 210 is connected to the fifth end of the drill bit 209; the limit key 211 is connected to the fourth end of the transmission rod 205; the fixed relationship between the shaft groove 210, the limit key 211 and the drill bit 209 and the transmission rod 205 can be switched with each other; for example, the shaft groove 210 can be arranged on the drill bit 209, and the limit key 211 can be arranged on the transmission rod 205, or the shaft groove 210 can be arranged on the transmission rod 205, and the limit key 211 can be arranged on the drill bit 209; there is a gap between the transmission rod 205 and the drill bit 209, which can enable the transmission rod 205 and the shaft groove 210 to move relative to each other in the axial direction of the transmission rod 205, thereby switching the synchronization state and the separation state of the second limit assembly.

[0060] When the drilling speed of the drill barrel 206 is greater than or equal to the drilling speed of the drill bit 209, the second limit assembly is in a synchronous state; when the excavation speed of the drill barrel 206 is less than the excavation speed of the drill bit 209, the second limit assembly is in a separated state. Specifically, when the sixth end of the drill bit 209 and the bottom plate of the drill barrel 206 encounter different soils, the difficulty of drilling is different; for example, when the drill barrel 206 encounters a more difficult drilling environment, the drilling speed of the drill barrel 206 will be less than the drill bit 209, and the drill bit 209 will move away from the transmission rod 205 along the axis of the transmission rod 205, so that the shaft groove 210 and the limit key 211 are disengaged, so that the drill barrel 206 rotates, and the transmission rod 205 does not rotate, thereby avoiding the drill bit 209 from rotating for a long time at a fixed position, causing the hole expansion phenomenon, and making the positioning rod formed by the drill bit 209, the transmission rod 205, and the extension rod 212 tilt, resulting in inaccurate positioning. When the drill bit 209 encounters a more difficult drilling environment, the drill barrel 206 and the drill bit 209 rotate together.

[0061] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-described embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A rotary drilling rig for drilling holes in building pile foundations, characterized in that: include: A vehicle body, a boom, a first drive device, a transmission rod and a drill tube, wherein the first drive device moves along the boom; The first driving device drives the transmission rod to rotate; The drill barrel can be detachably mounted on the transmission rod; the drill barrel rotates synchronously with the transmission rod; a through hole is provided on the drill barrel, the through hole penetrates the drill barrel along the axial direction of the drill barrel, the transmission rod is penetrated in the through hole, and there are also a drill bit and a second limiting assembly, the drill bit is connected to a position away from the first driving device, the drill bit has a third end and a fourth end, and the third end is fixed to the transmission rod by the second limiting assembly; the distance between the fourth end and the transmission rod is greater than the distance between the drill barrel lower cover and the transmission rod, and the second limiting assembly has a synchronous state and a separated state; in the synchronous state, the drill bit rotates synchronously with the transmission rod; in the separated state, the transmission rod and the drill bit can rotate relatively; When the drilling speed of the drill barrel is greater than or equal to the drilling speed of the drill bit, the drill bit is in the synchronous state; when the drilling speed of the drill barrel is less than the drilling speed of the drill bit, the drill bit is in the separated state; The second limit assembly is composed of a shaft groove and a limit key, one of which is arranged on the transmission rod and the other is arranged on the drill bit; When the drill barrel encounters a difficult drilling environment, the drilling speed of the drill barrel will be lower than the drill bit, and the drill bit will move away from the transmission rod along the axis of the transmission rod, causing the shaft groove and the limit key to disengage. It also includes a winding device, which includes a winding part and a steel cable. The winding device drives the steel cable to move, and the steel cable drives the drill barrel to move. The winding device rotates together with the transmission rod, and also includes a limit assembly, through which the drill barrel can be detachably mounted on the transmission rod; the limit assembly includes a limit state and a free state. When in the limit state, the drill barrel and the transmission rod Synchronous movement, when in the free state, the drill tube and the transmission rod can move relative to each other, and the limit assembly includes a limit groove, a sliding limit block and an elastic member; the elastic force of the elastic member always makes the sliding limit block close to the transmission rod or has a tendency to approach the transmission rod, and the sliding limit block slides in the limit groove; when in the free state, the steel cable overcomes the elastic force of the elastic member, so that the sliding limit block is away from the transmission rod; when in the limited state, the elastic member pushes the sliding limit block, and the sliding limit block abuts against the transmission rod.

2. A rotary drilling rig for drilling holes in building pile foundations according to claim 1, characterized in that: A first inclined surface is arranged in the limit groove, and the first inclined surface gradually moves away from the drill tube along a direction perpendicular to the axis of the transmission rod and away from the transmission rod. A second inclined surface is arranged on the sliding limit block, and the first inclined surface is always in contact with the second inclined surface. The movement of the steel cable drives the sliding limit block to slide along the first inclined surface.

3. A rotary drilling rig for drilling holes in building pile foundations according to claim 1, characterized in that: The rotary drilling rig also includes an extension rod, the number of which is one, and the extension rod has a first end and a second end, the first end is fixedly connected to the transmission rod, and the second end is detachably connected to the first drive device; the first drive drives the extension rod to move.

4. A rotary drilling rig for drilling holes in building pile foundations according to claim 1, characterized in that: The rotary drilling rig also includes an extension rod, and the number of the extension rods is multiple, wherein the first end of the extension rod close to the transmission rod is fixedly connected to the transmission rod, the second end of the extension rod away from the transmission rod is detachably connected to the first driving device, and the first ends of the remaining extension rods are detachably connected to the second ends of the extension rods adjacent to them.

5. A rotary drilling rig for drilling holes in building pile foundations according to claim 3, characterized in that: The length of the boom is greater than the length of the extension rod.

Images