Concrete vibrator for large-aperture pile foundation dry hole

Abstract

The invention relates to the technical field of vibrators, and particularly discloses a large-aperture pile foundation dry hole-based concrete vibrator which comprises a concrete hopper which is inserted into a pile hole, is perpendicular to the center of the pile hole and is lifted by a crane, an assembly pipe is fixedly mounted at the bottom end of the concrete hopper, and a protective cover is fixedly mounted on the outer side of the assembly pipe; a turbulent flow uniform stirring unit and a plurality of vibrating rods are arranged between the protective cover and the assembly pipe, the vibrating rods and the concrete hopper move synchronously, the relative positions of the vibrating rods and the concrete hopper are fixed, newly-poured concrete can be vibrated in real time, the continuously-poured concrete can be vibrated by the vibrating rods in time along with lifting of the concrete hopper, and the vibration effect of the vibrating rods is improved. After each part of concrete is poured, a vibrating rod can immediately turn over and vibrate the concrete, and the phenomenon that the concrete is layered and segregated due to the fact that the hole diameter and the depth of a large-hole-diameter pile foundation dry hole are large is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of vibrators, and more particularly to a concrete vibrator for large-diameter pile foundation dry holes. Background Art

[0002] The dry hole of large-diameter pile foundation is obtained by mechanical drilling or manual digging without mud wall protection under geological conditions with no groundwater or less groundwater. The dry hole of large-diameter pile foundation is usually deep. During the pouring of concrete, coarse aggregate may sink due to gravity, while relatively light components such as cement mortar may float, resulting in stratification and segregation of concrete. The use of concrete vibrator can fully mix the aggregate and mortar in the concrete through vibration, effectively avoiding stratification and segregation, and ensuring the uniformity and density of concrete within the entire depth range of the pile hole.

[0003] At present, when a concrete vibrator is vibrating, after the concrete in the pile hole is poured to a certain height, the operator inserts the vibrator vertically from above the concrete, and the vibration wave is transmitted from the vibrating rod to the concrete in contact with it, so that the particles inside the concrete are vibrated. After vibrating for a period of time at one place, the operator pulls the vibrator out of the concrete, moves it to an adjacent position and inserts it into the concrete again for vibration. This operation is repeated, and the concrete at different positions in the pile hole is gradually vibrated. However, the current concrete vibrator still has certain defects in the vibration operation process: 1. The diameter and depth of the dry hole of the large-diameter pile foundation are large, and the concrete is prone to segregation during the pouring process. If the vibration is not timely, the coarse aggregate will sink quickly, resulting in uneven distribution of the concrete, and the vibration effect of the vibrating rod at different depths in the hole may be different. At a shallow hole depth, the vibration energy of the vibrating rod is relatively strong, and the concrete vibration is relatively dense, but as the depth increases, the vibration energy will gradually decay, which may cause the concrete at the bottom or deep of the hole to be insufficiently vibrated, resulting in insufficient density.

[0004] 2. At present, during the pouring of dry holes for large-diameter pile foundations, cranes are often used to lift concrete hoppers up and down, and the weight and movement of the concrete hoppers are used to vibrate the concrete to a certain extent, thereby assisting in vibrating the concrete to make it dense. However, this type of vibration relies on crane operation, and it is impossible to accurately control the frequency, amplitude and time like a professional vibrator. This results in different vibration forces in different parts of the concrete, excessive vibration in some areas, separation of aggregate and cement slurry, and reduced strength; insufficient vibration in some areas, with many bubbles and voids inside, which affects the density and uniformity of quality. In addition, when the crane lifts the concrete hopper for vibration, it is difficult to grasp the vibration conditions at different depths inside the concrete. Especially when pouring at a great depth, the vibration force decays with increasing depth, and it is difficult to fully vibrate the deep concrete, making it difficult to discharge air and moisture, unevenly distributed coarse aggregate, insufficient density, and reduced structural bearing capacity. It may also cause deformation, cracks and other problems, affecting the quality and safety of the project. Summary of the invention

[0005] The present invention provides a concrete vibrator for a large-diameter pile foundation dry hole, which solves the above-mentioned technical problems.

[0006] The invention provides a concrete vibrator for a large-diameter pile foundation dry hole, comprising a concrete hopper inserted into the pile hole, perpendicular to the center of the pile hole and lifted by a crane, a mounting pipe fixedly installed at the bottom end of the concrete hopper, a protective cover fixedly installed on the outer side of the mounting pipe, a turbulent flow promoting and mixing unit and a plurality of vibrating rods are arranged between the protective cover and the mounting pipe, the turbulent flow promoting and mixing unit comprising a turbulent flow promoting and mixing component and a material turning composite motion component, a plurality of turbulent flow promoting and mixing components and the material turning composite motion components are circumferentially distributed, and each material turning composite motion component is connected to a turbulent flow promoting and mixing component in a one-to-one correspondence, so as to control the corresponding turbulent flow promoting and mixing component to perform rotational lifting and lowering motion.

[0007] The material turning composite motion assembly includes a shaft sleeve fixedly mounted on the outside of an assembly tube and a control shaft rotatably mounted in the shaft sleeve, a square rod is fixedly mounted on the bottom end of the control shaft, a cylindrical cam is provided on the sliding sleeve outside the square rod, and the turbulence promoting assembly includes a material turning paddle rotatably mounted on the bottom of the cylindrical cam via a rotating shaft.

[0008] The turbulence promoting component cooperates with the material turning composite motion component to turn the concrete under the vibrating rod to the vibration center of the vibrating rod. While strengthening the concrete convection in the pile hole and promoting the uniform distribution of the concrete, the concrete is fully vibrated to improve the density and homogeneity of the concrete.

[0009] Furthermore, the material turning composite motion assembly also includes a cam groove opened on the outside of the cylindrical cam and two fixing rings relatively fixedly installed on the outside of the assembly tube, and the inner walls of the upper fixing ring and the lower fixing ring are both fixedly installed with fixing rods that slide in cooperation with the cam groove, and the two fixing rods relatively installed up and down are distributed 180 degrees apart in the circumferential direction of the fixing ring.

[0010] Furthermore, the turbulence promoting component also includes a driving motor fixedly mounted on the inner wall of the rear side of the protective cover, and the driving motor drives the control shaft at the rear side through gear transmission, and the control shaft at the rear side is connected to the other control shafts through belt transmission.

[0011] Furthermore, a vibration domain expansion adjustment unit is provided between the protective cover and the assembly tube, and the vibration domain expansion adjustment unit includes a plurality of variable diameter actuator components, and the plurality of variable diameter actuator components are circumferentially distributed on the outside of the assembly tube and alternately arranged with the turbulence promoting components. The variable diameter actuator components include a mounting rail fixedly installed on the outside of the assembly tube and a movable sleeve slidably installed in the mounting rail, a mounting shaft is fixedly installed in the movable sleeve, and a vibrating rod is fixedly installed at the bottom end of the mounting shaft.

[0012] Furthermore, a slide groove is provided on one side of the installation shaft close to the assembly tube, a slider is slidably installed in the slide groove, a connecting rod is hinged between the slider and the outer wall of the assembly tube, and a tension spring is installed between the connecting rod and the outer wall of the assembly tube.

[0013] Furthermore, the vibration range expansion adjustment unit also includes a control component, which is used to control the radial movement of the variable diameter execution component to drive the vibrating rod to move synchronously and adjust the vibration center of the vibrating rod.

[0014] Furthermore, the regulating component includes a rotating sleeve rotatably mounted on the outside of the assembly tube and a plurality of cam plates fixedly mounted on the outside of the rotating sleeve and distributed in a circle, the cam plates being used to rotate, extrude and toggle the mounting shaft, and the plurality of cam plates respectively correspond to the plurality of mounting shafts.

[0015] Furthermore, a control motor is fixedly mounted on the top inner wall of the protective cover, and the control motor drives the rotating sleeve through gear transmission.

[0016] Furthermore, the bottom of the protective cover is provided with a plurality of through grooves which are circumferentially distributed and correspond one-to-one to the plurality of mounting shafts, a corrugated cover is fixedly installed at the bottom of the through grooves, the mounting shaft passes through the through grooves and the corrugated cover and extends to the bottom of the protective cover, the bottom of the corrugated cover is fixedly installed on the outside of the mounting shaft, and the corrugated cover adaptively deforms when the mounting shaft moves.

[0017] The beneficial effects of the present invention are as follows: 1. In the present application, the vibrating rod and the concrete hopper move synchronously, and the relative positions of the two are fixed, so that the newly poured concrete can be vibrated in real time. As the concrete hopper is lifted, the continuously poured concrete can be vibrated by the vibrating rod in time, and the synchronous movement method enables the vibrating rod to immediately turn over and vibrate each part of the concrete after pouring, effectively avoiding the stratification and segregation of concrete caused by the large diameter and depth of the dry hole of the large-diameter pile foundation, ensuring the uniformity of the concrete in the entire pile hole depth range, improving the quality of the pile foundation, and also ensuring that the vibration force is relatively balanced when vibrating at different depths, avoiding the situation where the vibrating rod vibrates excessively in shallow places and the vibration energy is insufficient in deep places.

[0018] 2. In the present application, the material turning assembly turns the material upward, while the newly poured concrete is transported downward, and the two move in opposite directions, thereby forming convection. On the one hand, during the convection process, aggregates and cement slurry at different depths are fully mixed and stirred, and the coarse aggregates and cement slurry that may have been unevenly distributed are redistributed evenly under the action of convection, thereby improving the homogeneity of the concrete. On the other hand, during the concrete pouring process, air will inevitably be mixed in to form bubbles, and the up and down convection allows the bubbles to have more opportunities to move upward and be discharged, thereby accelerating the discharge of air inside the concrete, thereby improving the density of the concrete and enhancing the strength and stability of the pile foundation.

[0019] 3. In the present application, the tipping paddle is designed to work near the vibrating rod, so that when the tipping paddle turns the concrete mix up in a small area, the vibrating rod can vibrate this part of the concrete in time, so that the aggregate and cement slurry can quickly reach a relatively stable state in a smaller space, thereby improving the vibration effect while avoiding concrete segregation due to excessive disturbance.

[0020] 4. In the present application, the vibration range expansion adjustment unit can flexibly adjust the vibration center and vibration range of the vibrating rod, can adapt to pile holes of different diameters and complex construction environments, improve the versatility of the vibrator, reduce construction difficulties caused by pile hole differences, and reduce construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a state diagram of the present invention when vibrating operation is being performed.

[0022] Figure 2 The utility model is a three-dimensional structural schematic diagram of the concrete hopper, the assembly pipe, the protective cover, the corrugated cover and the vibrating rod of the present invention.

[0023] Figure 3 It is a partial three-dimensional structural schematic diagram of the vibration range expansion and adjustment unit and the turbulence promoting and uniform stirring unit of the present invention.

[0024] Figure 4It is a schematic diagram of the three-dimensional structure of the driving motor, cylindrical cam, cam groove, fixing ring and fixing rod of the present invention.

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the assembly tube, cam plate, mounting shaft, vibrating rod and rotating sleeve of the present invention.

[0026] Figure 6 It is a partial three-dimensional structural sectional view of the mounting rail, movable sleeve, mounting shaft, slide groove and sliding block of the present invention.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the cylindrical cam, cam groove, material turning paddle and rotating shaft part of the present invention.

[0028] Figure 8 It is a partial three-dimensional structural sectional view of the shaft sleeve, control shaft, square rod, cylindrical cam and fixing ring of the present invention.

[0029] In the figure: 1, through slot; 2, concrete hopper; 3, assembly pipe; 4, protective cover; 5, vibration range expansion adjustment unit; 6, turbulence promotion and uniform mixing unit; 7, corrugated cover; 8, vibration rod; 501, variable diameter execution component; 502, control component; 5011, mounting rail; 5012, moving sleeve; 5013, mounting shaft; 5014, slideway; 5015, slider; 5016, connecting rod; 5017, tension spring; 5021, rotating sleeve; 5022, cam plate; 5023, control motor; 601, turbulence promoting assembly; 602, material turning compound motion assembly; 603, driving motor; 6011, rotating shaft; 6012, material turning paddle; 6021, bushing; 6022, control shaft; 6023, square rod; 6024, cylindrical cam; 6025, cam groove; 6026, fixing ring; 6027, fixing rod. DETAILED DESCRIPTION

[0030] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is to enable those skilled in the art to better understand and implement the subject matter described herein. The functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the present specification. Various examples may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0031] See also Figure 1 , Figure 2 and Figure 3In this embodiment, a concrete vibrator for a large-diameter pile foundation dry hole is proposed, which is used to vibrate and evenly distribute the concrete in the pile hole on the ground. The vibrator includes a concrete hopper 2 inserted into the pile hole and perpendicular to the center of the pile hole and lifted by a crane. The concrete hopper 2 serves as a concrete conveying channel to convey concrete from the ground to the pile hole. An assembly pipe 3 is fixedly installed at the bottom end of the concrete hopper 2, and a protective cover 4 is fixedly installed on the outer side of the assembly pipe 3. The protective cover 4 can block the splashed concrete during the vibration process, thereby protecting its internal components from direct impact and wear of the concrete, and preventing the concrete from affecting the normal operation of the components.

[0032] A vibration range expansion and adjustment unit 5, a turbulent flow promoting and stirring unit 6 and a plurality of vibrating rods 8 are arranged between the protective cover 4 and the assembly tube 3. The assembly tube 3 provides an installation position for the protective cover 4, the turbulent flow promoting and stirring unit 6, the vibrating rods 8 and the vibration range expansion and adjustment unit 5, and plays a role in connection and support. The turbulent flow promoting and stirring unit 6 includes a turbulent flow promoting and stirring component 601 and a material turning compound motion component 602. There are multiple turbulent flow promoting and stirring components 601 and material turning compound motion components 602 distributed circumferentially, and each material turning compound motion component 602 is connected to a turbulent flow promoting and stirring component 601 in a one-to-one correspondence to control the corresponding turbulent flow promoting and stirring component 601 to perform rotational and lifting movements.

[0033] During specific use, during the pouring preparation process before the vibration operation, the assembly pipe 3 is fixedly connected to the bottom of the concrete hopper 2 through a flange. During construction, concrete is continuously and stably poured to the bottom of the pile hole through the concrete hopper 2 and the assembly pipe 3. As the pouring progresses, the concrete hopper 2 is gradually lifted to ensure that the pile hole can be evenly and completely filled with concrete, providing a suitable concrete environment for subsequent vibration.

[0034] See also Figure 2 , Figure 3 , Figure 5 and Figure 6 The vibration range expansion adjustment unit 5 includes a plurality of variable-diameter actuator components 501, which are circumferentially distributed on the outside of the assembly tube 3 and alternately arranged with the turbulence promoting components 601. The variable-diameter actuator components 501 include a mounting rail 5011 fixedly mounted on the outside of the assembly tube 3 and a movable sleeve 5012 slidably mounted in the mounting rail 5011. A mounting shaft 5013 is fixedly mounted in the movable sleeve 5012, and the vibrating rod 8 is fixedly mounted on the bottom end of the mounting shaft 5013.

[0035] See also Figure 5 and Figure 6 The installation shaft 5013 is provided with a slide groove 5014 on one side close to the assembly tube 3, a slider 5015 is slidably installed in the slide groove 5014, a connecting rod 5016 is hinged between the slider 5015 and the outer wall of the assembly tube 3, and a tension spring 5017 is installed between the connecting rod 5016 and the outer wall of the assembly tube 3.

[0036] See also Figure 3 and Figure 5 The vibration domain expansion adjustment unit 5 also includes a control component 502, which is used to control the radial movement of the variable diameter execution component 501 to drive the vibrating rod 8 to move synchronously and adjust the vibration center of the vibrating rod 8. The control component 502 includes a rotating sleeve 5021 rotatably installed on the outside of the assembly tube 3 and a plurality of cam discs 5022 fixedly installed on the outside of the rotating sleeve 5021 and distributed in a circle. The cam disc 5022 is used to rotate, extrude and toggle the installation shaft 5013. The plurality of cam discs 5022 correspond to the plurality of installation shafts 5013 one by one. A control motor 5023 is fixedly installed on the top inner wall of the protective cover 4, and the control motor 5023 drives the rotating sleeve 5021 through gear transmission.

[0037] See also Figure 2 , Figure 3 , Figure 5 and Figure 6 The bottom of the protective cover 4 is provided with a plurality of through grooves 1 which are circumferentially distributed and correspond one to one with the plurality of mounting shafts 5013. A corrugated cover 7 is fixedly installed at the bottom of the through groove 1. The mounting shaft 5013 passes through the through groove 1 and the corrugated cover 7 and extends to the bottom of the protective cover 4. The bottom of the corrugated cover 7 is fixedly installed on the outside of the mounting shaft 5013. The through groove 1 and the corrugated cover 7 at the bottom of the protective cover 4 provide space for the movement of the mounting shaft 5013 and the vibrating rod 8. The bottom of the corrugated cover 7 is fixed on the outside of the mounting shaft 5013 and can adaptively deform with the movement of the mounting shaft 5013, thereby preventing concrete from entering the interior of the protective cover 4 and not hindering the movement and adjustment of the mounting shaft 5013.

[0038] During specific use, when it is necessary to adjust the vibration range and the vibration center, the output shaft of the control motor 5023 drives the rotating sleeve 5021 to rotate through gear transmission, thereby driving the multiple cam plates 5022 distributed in a circle on the outside of the rotating sleeve 5021 to rotate accordingly, and the rotating cam plates 5022 will squeeze and toggle the installation shaft 5013 to move the installation shaft 5013, driving the movable sleeve 5012 to slide along the installation rail 5011, and when the installation shaft 5013 moves, the slider 5015 in the slide groove 5014 slides accordingly, and at the same time, the movement of the installation shaft 5013 is transmitted to the connecting rod 5016 through the slider 5015, and the connecting rod 5016 converts this force into a pulling force along its own axial direction (cooperating with a tension spring), so that the movement of the installation shaft 5013 is more stable and maintained in a specific direction, while playing a pulling role for the reset of the movable sleeve 5012, and when the adjustment is completed, the output shaft of the control motor 5023 stops rotating.

[0039] See also Figure 3 , Figure 7 and Figure 8The material turning composite motion component 602 includes a sleeve 6021 fixedly mounted on the outside of the assembly tube 3 and a control shaft 6022 rotatably mounted in the sleeve 6021. A square rod 6023 is fixedly mounted on the bottom end of the control shaft 6022. A cylindrical cam 6024 is provided on the sliding sleeve outside the square rod 6023. The turbulence promoting component 601 includes a material turning paddle 6012 rotatably mounted on the bottom of the cylindrical cam 6024 through a rotating shaft 6011.

[0040] See also Figure 4 and Figure 8 The material turning composite motion component 602 also includes a cam groove 6025 opened on the outside of the cylindrical cam 6024 and two fixing rings 6026 relatively fixedly installed on the outside of the assembly tube 3, and the inner wall of the upper fixing ring 6026 and the inner wall of the lower fixing ring 6026 are fixedly installed with fixing rods 6027 that slide with the cam groove 6025, and the two fixing rods 6027 relative to each other are distributed 180 degrees around the circumference of the fixing ring 6026.

[0041] See also Figure 3 , Figure 4 and Figure 7 The turbulence promoting component 601 also includes a driving motor 603 fixedly mounted on the inner wall of the rear side of the protective cover 4. The driving motor 603 drives the control shaft 6022 at the rear side through gear transmission. The control shaft 6022 at the rear side is connected to the other control shafts 6022 through belt transmission.

[0042] During specific use, during the process of pouring concrete into the pile hole, there is a gap between the bottom end of the assembly pipe 3 and the poured concrete, and the turning paddle 6012 and the vibrating rod 8 are inserted into the concrete. As the concrete hopper 2 gradually lifts the vibrating rod 8, the driving motor 603 fixedly installed on the inner wall of the rear side of the protective cover 4 is started, and the driving motor 603 transmits power to the control shaft 6022 located on the rear side through gear transmission, so that the rear control shaft 6022 starts to rotate and drives the remaining control shafts 6022 to rotate synchronously through belt transmission. As the control shaft 6022 rotates, the square rod 6023 also rotates synchronously, thereby driving the cylindrical cam 6024 to rotate. During the rotation of the cylindrical cam 6024, since the two fixed rods 6027 are slidably matched with the cam groove 6025 opened on the outside of the cylindrical cam 6024, this matching method enables the cylindrical cam 6024 to move up and down along the square rod 6023 while rotating, thereby realizing the compound movement of rotation and lifting.

[0043] It should be noted that a cam groove 6025 is provided on the outer side of the cylindrical cam 6024, and two fixed rods 6027 are slidably matched with the cam groove 6025. This matching mode constrains and guides the movement of the cylindrical cam 6024. When the cylindrical cam 6024 rotates in a circle driven by the square rod 6023, the fixed rod 6027 slides in the cam groove 6025. Since the cam groove 6025 has a specific curved shape, as the fixed rod 6027 slides in the cam groove 6025, a force is generated on the cylindrical cam 6024 along the axial direction of the square rod 6023. This force causes the cylindrical cam 6024 to move up and down along the square rod 6023 while rotating in a circle, thereby realizing a compound movement of rotation and lifting.

[0044] During the process of the cylindrical cam 6024 performing a combined rotation and lifting motion along the square rod 6023, the turning paddle 6012 is driven to perform a synchronous rotation and lifting motion. During the rotation of the turning paddle 6012, it stirs the surrounding concrete. At the same time, the lifting motion causes the turning paddle 6012 to flip the concrete below the vibrating rod 8 upward to the vibration center of the vibrating rod 8. At the same time, the newly poured concrete flows downward, and the two form convection. During the convection process, the aggregate and cement slurry in the concrete are fully mixed, and the air inside the concrete is also accelerated to be discharged under the action of vibration and turning, thereby improving the density and uniformity of the concrete.

[0045] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A concrete vibrator for large-diameter pile foundation dry holes, characterized in that: It includes a concrete hopper inserted into a pile hole, perpendicular to the center of the pile hole and lifted by a crane, a mounting pipe is fixedly installed at the bottom end of the concrete hopper, a protective cover is fixedly installed on the outer side of the mounting pipe, a turbulent flow promoting uniform mixing unit and a plurality of vibrating rods are arranged between the protective cover and the mounting pipe, the turbulent flow promoting uniform mixing unit includes a turbulent flow promoting uniform component and a material turning composite motion component, a plurality of turbulent flow promoting uniform components and material turning composite motion components are circumferentially distributed, and each material turning composite motion component is connected to a turbulent flow promoting uniform component in a one-to-one correspondence, so as to control the corresponding turbulent flow promoting uniform component to perform rotating and lifting motion; The material turning composite motion assembly includes a shaft sleeve fixedly mounted on the outside of an assembly tube and a control shaft rotatably mounted in the shaft sleeve, a square rod is fixedly mounted on the bottom end of the control shaft, a cylindrical cam is provided on the sliding sleeve outside the square rod, and the turbulence promoting assembly includes a material turning paddle rotatably mounted on the bottom of the cylindrical cam via a rotating shaft.

2. A concrete vibrator for large-diameter pile foundation dry hole according to claim 1, characterized in that: The material turning composite motion assembly also includes a cam groove opened on the outside of the cylindrical cam and two fixing rings relatively fixedly installed on the outside of the assembly tube. The inner wall of the upper fixing ring and the inner wall of the lower fixing ring are both fixedly installed with fixing rods that slide in cooperation with the cam groove. The two fixing rods relatively to each other are distributed 180 degrees apart in the circumferential direction of the fixing ring.

3. A concrete vibrator for large-diameter pile foundation dry hole according to claim 1, characterized in that: The turbulence promoting component also includes a driving motor fixedly mounted on the inner wall of the rear side of the protective cover. The driving motor drives the control shaft at the rear side through gear transmission. The control shaft at the rear side is connected to the other control shafts through belt transmission.

4. A concrete vibrator for large-diameter pile foundation dry hole according to claim 1, characterized in that: A vibration domain expansion adjustment unit is also arranged between the protective cover and the assembly tube. The vibration domain expansion adjustment unit includes a plurality of variable diameter actuator components. The plurality of variable diameter actuator components are circumferentially distributed on the outside of the assembly tube and are alternately arranged with the turbulence promoting components. The variable diameter actuator components include a mounting rail fixedly mounted on the outside of the assembly tube and a movable sleeve slidably mounted in the mounting rail. A mounting shaft is fixedly mounted in the movable sleeve, and a vibrating rod is fixedly mounted on the bottom end of the mounting shaft.

5. A concrete vibrator for large-diameter pile foundation dry hole according to claim 4, characterized in that: A sliding groove is provided on one side of the installation shaft close to the assembly tube, a sliding block is slidably installed in the sliding groove, a connecting rod is hinged between the sliding block and the outer wall of the assembly tube, and a tension spring is installed between the connecting rod and the outer wall of the assembly tube.

6. A concrete vibrator for large-diameter pile foundation dry hole according to claim 4, characterized in that: The vibration range expansion adjustment unit also includes a control component, which is used to control the radial movement of the variable diameter execution component to drive the vibration rod to move synchronously and adjust the vibration center of the vibration rod.

7. A concrete vibrator for large-diameter pile foundation dry hole according to claim 6, characterized in that: The regulating component includes a rotating sleeve rotatably mounted on the outside of the assembly tube and a plurality of cam plates fixedly mounted on the outside of the rotating sleeve and distributed in a circle. The cam plates are used for rotating, squeezing and toggling the mounting shaft. The plurality of cam plates correspond to the plurality of mounting shafts one by one.

8. A concrete vibrator for large-diameter pile foundation dry hole according to claim 7, characterized in that: A control motor is fixedly mounted on the top inner wall of the protective cover, and the control motor drives the rotating sleeve through gear transmission.

9. The concrete vibrator for large-diameter pile foundation dry hole according to claim 4, characterized in that: The bottom of the protective cover is provided with a plurality of through grooves which are distributed circumferentially and correspond one to one with the plurality of mounting shafts. A bellows is fixedly mounted at the bottom of the through grooves. The mounting shaft passes through the through grooves and the bellows and extends to the bottom of the protective cover. The bottom of the bellows is fixedly mounted on the outside of the mounting shaft. When the mounting shaft moves, the bellows deforms adaptively.

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