Novel damping device for hydraulic power head of rotary drilling rig

Abstract

The utility model discloses a novel rotary drilling rig hydraulic power head damping device which comprises a drill rod, the upper end of the drill rod is fixedly connected with a drill rod outer flange, a power head box body is arranged below the drill rod outer flange, a hydraulic damper is arranged above the power head box body, a power head pressing plate is arranged above the hydraulic damper, and the power head pressing plate is connected with the drill rod outer flange. The hydraulic shock absorber comprises a shock absorption hydraulic oil cylinder, a piston rod is installed in an inner cavity, a belleville spring combination is arranged at the bottom of the piston rod, a piston rod connection fastening nut is arranged at the end of the piston rod, and a shock absorption oil cylinder end cover is connected to the upper end face of the shock absorption hydraulic oil cylinder in a sleeved mode. According to the structure, a hydraulic damping system is adopted, the more effective damping effect can be provided, installation and maintenance are easy, the stability of the power head is enhanced, damage caused by vibration is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to a shock absorption device for the hydraulic power head of a new type of rotary drilling rig, belonging to the field of construction machinery. Background Art

[0002] A rotary drilling rig is a construction machine suitable for hole-forming operations in building foundation engineering. It is mainly suitable for construction in soil layers such as sandy soil, cohesive soil, and silty soil, and is widely used in various foundation construction projects such as cast-in-place piles and foundation reinforcement. The mast of a rotary drilling rig (referred to as the drill mast) is an important part of the rotary drilling rig, and it is usually connected to the luffing mechanism of the rotary drilling rig through a turntable connection structure.

[0003] The rotary drilling rig is widely used for hole-forming operations in building foundation engineering. During the drilling process, the contact between the drill pipe and the power head will generate a large impact force, resulting in damage to the power head and internal components of the drilling rig. In the prior art, although shock absorption measures such as springs are adopted, there are still problems of poor shock absorption effect and easy damage of the shock absorption device when facing complex geological conditions and high-load working conditions. Summary of the Utility Model

[0004] The utility model provides a shock absorption device for the hydraulic power head of a new type of rotary drilling rig to overcome the defects of poor shock absorption effect and easy damage of the shock absorption device in the prior art under complex geological conditions and high-load working conditions.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] The utility model discloses a shock absorption device for the hydraulic power head of a new type of rotary drilling rig, including a drill pipe. The upper end of the drill pipe is fixedly connected with an outer flange of the drill pipe, and a power head box body is arranged below it. A hydraulic shock absorber is arranged above the power head box body, and a power head pressure plate is arranged above the hydraulic shock absorber. The hydraulic shock absorber includes a shock absorption hydraulic cylinder, and a piston rod is installed in its inner cavity. A disc spring assembly is arranged at the bottom of the piston rod, and a piston rod connection fastening nut is arranged at its end. The shock absorber cylinder end cover is sleeved on the upper end face of the shock absorption hydraulic cylinder.

[0007] Further, a piston rod seal ring is arranged at the contact position between the piston rod and the shock absorber cylinder end cover.

[0008] Further, piston damping holes are arranged on the piston rod to facilitate the flow of hydraulic oil.

[0009] Further, a limiting block fixed on the lower end cover of the shock absorption hydraulic cylinder is arranged inside the disc spring assembly to limit the compression amount of the disc spring assembly.

[0010] Further, the power head pressure plate is used to support the outer flange of the drill pipe of the rotary drilling rig during rapid lowering, facilitating the effectiveness of the hydraulic shock absorber.

[0011] The beneficial effects achieved by the present utility model are as follows: This structure adopts a hydraulic shock absorption system, which can provide a more effective shock absorption effect, is easy to install and maintain, enhances the stability of the power head, reduces damage caused by vibration, and extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0013] Figure 1 is a schematic structural diagram of the present utility model;

[0014] Figure 2 is a schematic structural diagram of the hydraulic shock absorber of the present utility model.

[0015] In the figures: 1, power head housing; 2, hydraulic shock absorber; 21, shock absorption hydraulic cylinder; 22, shock absorption cylinder end cover; 23, piston rod; 24, piston damping hole; 25, disc spring assembly; 26, piston rod sealing ring; 27, piston rod connection fastening nut; 3, power head pressure plate; 4, drill pipe; 5, outer flange of drill pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following is a description of the preferred embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model and are not used to limit the present utility model.

[0017] Embodiment 1

[0018] As Figures 1-2 shown, a new type of hydraulic power head shock absorption device for a rotary drilling rig includes a drill pipe 4. The upper end of the drill pipe 4 is fixedly connected with an outer flange 5 of the drill pipe. Below it is provided with a power head housing 1. Above the power head housing 1 is provided with a hydraulic shock absorber 2. Above the hydraulic shock absorber 2 is provided with a power head pressure plate 3.

[0019] The hydraulic shock absorber 2 includes a shock absorption hydraulic cylinder 21. A piston rod 23 is installed in its inner cavity. At the bottom of the piston rod 23 is provided with a disc spring assembly 25. At its end is provided with a piston rod connection fastening nut 27. The shock absorption cylinder end cover 22 is sleeved on the upper end face of the shock absorption hydraulic cylinder 21. A piston rod sealing ring 26 is provided at the contact position between the piston rod 23 and the shock absorption cylinder end cover 22. A piston damping hole 24 is provided on the piston rod 23.

[0020] Working principle: When the rotary drilling rig is quickly lowered and the outer flange 5 of the drill pipe lands on the power head pressure plate 3, the strong impact force of the drill pipe 4 will be transmitted to the piston rod 23 through the power head pressure plate 3. Since the liquid cannot be compressed, the hydraulic oil in the rodless cavity forms high pressure after being impacted, and then returns to the rod cavity through the damping hole 24 on the piston rod 23. At this time, the piston rod 23 moves downward, compressing the disc spring assembly 25. This process can effectively reduce the impact force of the drill pipe 4 on the power head and protect the internal structure of the power head reducer. When the drill pipe 4 is lifted away from the power head pressure plate 3, the compressed disc spring assembly 25 rebounds and rises, pushing the piston rod 23 up to the high position and restoring to the original position.

[0021] There is a limit block fixed on the lower end cover of the shock-absorbing hydraulic cylinder 21 inside the inner ring of the disc spring assembly 25. The limit block ensures that the disc spring assembly 25 will not be further compressed after the piston rod 23 is pressed down in place, ensuring that the disc spring assembly 25 works within the infinite design life area.

[0022] It should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The terms used in the description of this application are only for describing specific embodiments and are not intended to limit the exemplary embodiments of this application. For the sake of description, the dimensions of each part shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0023] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally indicates an "or" relationship between the associated objects before and after.

[0024] It should be noted that in the description of this application, the orientation or positional relationships indicated by the orientation terms such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description. Without contrary explanation, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of this application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

Claims

1. A novel damping device for the hydraulic power head of a rotary drilling rig, characterized in that, It includes a drill pipe. A drill pipe outer flange is fixedly connected to the upper end of the drill pipe. A power head housing is provided below it. A hydraulic shock absorber is provided above the power head housing. A power head pressure plate is provided above the hydraulic shock absorber. The hydraulic shock absorber includes a shock-absorbing hydraulic cylinder. A piston rod is installed in its inner cavity. A disc spring assembly is provided at the bottom of the piston rod. A piston rod connection fastening nut is provided at its end. A shock-absorbing cylinder end cover is sleeved on the upper end face of the shock-absorbing hydraulic cylinder.

2. The novel hydraulic power head shock absorber device for a rotary drilling rig according to claim 1, characterized in that, A piston rod sealing ring is provided at the contact between the piston rod and the shock-absorbing cylinder end cover.

3. The novel hydraulic power head shock absorber device for a rotary drilling rig according to claim 1, wherein Piston damping holes are provided on the piston rod to facilitate the flow of hydraulic oil.

4. The novel hydraulic power head shock absorber device for a rotary drilling rig according to claim 1, characterized in that, A limiting block fixed on the lower end cover of the shock-absorbing hydraulic cylinder is provided inside the inner ring of the disc spring assembly to limit the compression amount of the disc spring assembly.

5. The novel hydraulic power head shock absorption device of a rotary drilling rig according to claim 1, characterized in that, The power head pressure plate is used to support the drill pipe outer flange of the rotary drilling rig during rapid lowering, facilitating the effectiveness of the hydraulic shock absorber.

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