Water pressure core pushing device

Abstract

The utility model belongs to the field of engineering machinery relates to a water pressure pushes the core device, including the drill cylinder, is hollow cylindrical structure, its one end is equipped with the water inlet, to go into the cooling water, first push the material board, along the axial sliding installation of drill cylinder is in the inner chamber of drill cylinder, is equipped with the water outlet hole and the valve core installation cavity of radial arrangement in first push the material board, the valve core installation cavity links the water outlet hole and has the valve core and elastic component inbuilt, the valve core radial removal installs in valve core installation cavity, is under the pre -tightening force of elastic component in initial position, to close the water outlet hole, and under the centrifugal force effect moves outward to open the water outlet hole, the one end of valve core installation cavity is equipped with the block far from the water outlet hole, is used for fixing spring and closing valve core installation cavity. The utility model through the centrifugal movement of valve core, realizes the automatic switching of water flow state in the drilling and pushes the core stage, need not external control, the water flow is used for cooling lubrication when drilling, closes the water flow and forms high pressure to realize pushing the core when pushing the core.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery and relates to a hydraulic core pusher device. Background Technology

[0002] Water-cooled drills, widely used in geotechnical engineering, geological exploration, and pile foundation construction, primarily function to obtain cylindrical rock cores by using a rotating drill bit to make circumferential cuts in rock strata. However, successfully removing the rock core during construction remains a technical challenge. In conventional water-cooled drilling operations, when the drill bit cuts into the rock strata, if it encounters well-developed internal rock fissures or uneven lithology, the rock core is prone to fracture and become stuck inside the core-retrieving drill bit. Because the outer diameter of the rock core is usually smaller than the inner diameter of the drill bit's steel pipe, coupled with the irregular shape of the fractured rock core and the obstruction from residual gravel and mud inside the drill bit, the rock core becomes misaligned and stuck inside the drill bit, making it difficult to remove directly.

[0003] Currently, the commonly used core-pushing methods in the industry include mechanical hammering, jacking, and split-bit methods, each with the following significant drawbacks: Mechanical Hammering: This method involves manually striking the outer wall of the drill bit to generate vibration and loosen the core. It relies heavily on operator experience, making precise control of the striking force difficult, easily leading to drill bit deformation or damage to connecting components, and has limited effectiveness for deep core jamming. Jacking: This method involves inserting rigid tools such as steel bars into the opening at the top of the drill string (usually the drill barrel) to forcibly push out the core. This method requires frequent disassembly of equipment, has limited operating space, carries a high risk of secondary core fragmentation during jacking, and cannot achieve continuous operation. Split-bit Method: This method designs the core-retrieving drill bit as a separable two-half structure, removing the core by splitting the drill bit. Although this method can directly expose the stuck core, the split structure significantly weakens the overall strength of the drill bit, increases manufacturing costs, and the repeated disassembly and reassembly significantly reduces construction efficiency.

[0004] It is worth noting that water-cooled drilling operations require a continuous injection of large amounts of cooling water to reduce the frictional heat of the drill bit and lubricate the cutting surface, but existing technologies have not effectively utilized this inherent resource. Cooling water is usually directly discharged or simply recycled, and its inherent fluid kinetic energy has not been developed for assisting core pushing, resulting in energy waste and missing potential technological breakthroughs to simplify the core pushing process.

[0005] In summary, traditional water-jet drilling core-pushing methods generally suffer from low efficiency, reliance on manual intervention, high equipment wear and tear, and inability to operate continuously. Existing improved solutions are either too complex and costly, or suffer from poor compatibility and insufficient reliability, making them difficult to promote and apply in practical engineering. Therefore, there is an urgent need for an innovative device that can fully utilize the existing working medium (cooling water) of the water-jet drill, has a simple structure, and can achieve efficient and continuous core discharge. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a hydraulic core pusher device, which, by optimizing the internal flow channel design of the drill barrel, converts the fluid pressure of cooling water into the power for core discharge, thereby achieving the integration and efficiency of the construction process and solving the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A hydraulic thruster device, comprising:

[0009] The drill barrel is a hollow cylindrical structure with a water inlet at one end for cooling water to be introduced.

[0010] The first pusher plate is slidably installed in the inner cavity of the drill barrel along the axial direction. The first pusher plate is provided with an axially penetrating water outlet and a radially arranged valve core mounting cavity. The valve core mounting cavity is connected to the water outlet and contains a valve core and an elastic component.

[0011] The valve core is radially moved and installed in the valve core mounting cavity. Under the pre-tightening force of the elastic component, it is in the initial position to close the water outlet, and under the action of centrifugal force, it moves outward to open the water outlet.

[0012] The valve core mounting cavity is provided with a plug at the end away from the water outlet to fix the elastic component and seal the valve core mounting cavity.

[0013] Furthermore, it also includes:

[0014] The second pusher plate is arranged on the side of the first pusher plate away from the water inlet, and the second pusher plate is provided with water passage holes.

[0015] Furthermore, the outer edge of the second pusher plate is fitted with a clearance fit to the inner wall of the drill barrel.

[0016] Furthermore, the surface of the second pusher plate is inlaid with a hard alloy wear-resistant layer.

[0017] Furthermore, a spacer ring is provided between the first pusher plate and the second pusher plate; specifically, the spacer ring is a low-resistance spacer ring, which reduces the resistance between the first pusher plate and the second pusher plate and forms a water passage gap between the first pusher plate and the second pusher plate.

[0018] Furthermore, the elastic component is a spring.

[0019] Furthermore, a sealing assembly is provided at the contact surface between the first pusher plate and the drill barrel to prevent cooling water leakage.

[0020] Furthermore, the sealing component is a sealing ring.

[0021] The beneficial effects of this utility model are as follows:

[0022] Firstly, this hydraulic core-pushing device innovatively utilizes the centrifugal force generated during drill barrel rotation to control the flow of water. During the drilling phase, the drill barrel rotation drives the valve core to overcome the preload of the elastic component, thereby opening the water outlet and allowing cooling water to flow accurately to the core contact surface, effectively meeting the cooling requirements during drilling. During the core-pushing phase, the drill barrel stops rotating, and the valve core automatically resets to close the water outlet, forming a sealed cavity. Through continuous water injection, the water pressure rises to a set threshold, pushing the first pusher plate to push the core out at a constant speed. This design not only ensures the stability of the core-pushing process but also achieves precise water flow control, significantly improving the efficiency of drilling and core-pushing.

[0023] Secondly, the device excels in water conservation. Because the valve core remains closed under the action of the elastic component when the drill barrel is not rotating, no water is released. Considering that most of the drilling process is auxiliary, this design significantly reduces water waste, achieving the goal of water conservation and environmental protection.

[0024] Finally, the device achieves automatic core pushing, significantly reducing manpower and simplifying construction procedures. Traditional drilling devices require manual operation during core pushing, which is not only labor-intensive but also poses safety hazards. This device, however, uses water pressure to push the first pusher plate, achieving automatic core ejection, ensuring the safety of construction personnel and improving construction efficiency. More importantly, this innovative design solves a major problem in the industry, providing new ideas and methods for the development of drilling technology.

[0025] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0027] Figure 1 This is a schematic diagram of the drill barrel structure in the conventional core-pushing method;

[0028] Figure 2 This is a schematic diagram of the structure of a hydraulic core-push device in the embodiment (drilling state);

[0029] Figure 3 This is a schematic diagram of the structure of a hydraulic core-push device in one embodiment (core-push state);

[0030] Figure 4This is a partial structural schematic diagram of a hydraulic thruster device in one embodiment;

[0031] Figure 5 This is a flowchart illustrating a control method for a hydraulic thruster device in one embodiment.

[0032] Attached reference numerals: 1-Drill barrel, 2-First pusher plate, 3-Spring, 4-Valve core, 5-Second pusher plate, 6-Nut, 7-Flat washer, 8-Spacer ring, 9-Plug, 10-Sealing ring, 11-Outlet, 12-Pass through hole, 13-Inlet. Detailed Implementation

[0033] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0034] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0035] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] Please see Figure 1 This is a drill barrel used in the existing push-pull method. The end of the drill barrel 1 away from the drill barrel opening is provided with a through hole for inserting a reinforcing bar. The operation method for core sampling is as follows: insert a reinforcing bar through the through hole at the end of the drill barrel 1 away from the drill barrel opening, and use the reinforcing bar to push the rock core outward.

[0037] This method requires frequent disassembly of equipment, has limited operating space, carries a high risk of secondary core fragmentation during the jacking process, and cannot achieve continuous operation.

[0038] Example 1

[0039] Please see Figures 2-4 A hydraulic core pusher device includes a drill barrel 1, a first pusher plate 2, a spring 3, a valve core 4, a second pusher plate 5, a nut 6, a flat washer 7, a spacer ring 8, and sealing components, etc.

[0040] The structural connection relationships of the various components are as follows:

[0041] Drill barrel 1: It is a hollow cylindrical structure with an inner cavity for slidingly mounting the first pusher plate 2 along its axial direction and for accommodating the rock core, and has a water inlet 13 at one end for connecting the drilling mechanism to allow cooling water to be introduced into the drill barrel 1.

[0042] First pusher plate 2: Slidably installed in the inner cavity of drill barrel 1 along the axial direction of drill barrel 1. It has a water outlet hole 11 that penetrates the first pusher plate 2 along the axial direction and a valve core mounting cavity arranged radially. The valve core mounting cavity is arranged on the side of the water outlet hole 11 away from the center of the first pusher plate 2 and communicates with the water outlet hole 11. A valve core 4 and a spring 3 are built into it. The valve core 4 is a radially movable structure. Its initial position is under the preload of the spring 3 and is located in the water outlet hole 11 to close the water outlet hole 11 with a diameter of A.

[0043] Furthermore, the spring 3 is arranged on the side of the valve core 4 away from the center of the first pusher plate 2, and a plug 9 is provided at the end of the valve core mounting cavity away from the water outlet 11 to close the valve core mounting cavity and fix one end of the spring 3.

[0044] Second pusher plate 5: The second pusher plate 5 is arranged on the side of the first pusher plate 2 away from the water inlet, and passes through the first pusher plate 2 through a stud with a central protrusion. It is then connected to the stud by a nut 6, and a flat washer 7 is provided between the nut 6 and the first pusher plate 2, so that the first pusher plate 2 and the second pusher plate 5 are rotatably connected with the stud as the axis. A water passage hole 12 opposite to the water outlet hole 11 is provided on the second pusher plate 5 so that cooling water can flow out of the drill barrel. In this embodiment, a retaining ring can be used to replace the nut 6 to achieve the axial limiting function of the stud.

[0045] In another embodiment, the nut 6 can also lock the first pusher plate 2 and the second pusher plate 5 by connecting with the stud, so that the first pusher plate 2 and the second pusher plate 5 are fixedly connected; or the first pusher plate 2 and the second pusher plate 5 can be fixedly connected by means such as welding.

[0046] Furthermore, a spacer ring 8 is provided between the second pusher plate 5 and the first pusher plate 2. Specifically, the spacer ring is a low-resistance spacer ring, which reduces the resistance between the first pusher plate and the second pusher plate and forms a water passage gap between the first pusher plate and the second pusher plate to prevent the second pusher plate 5 from blocking the water outlet hole 11 when the water passage hole 12 and the water outlet hole 11 of the second pusher plate 5 are arranged coaxially.

[0047] The outer edge of the second pusher plate 5 is fitted with the inner wall of the drill barrel 1 with a clearance to avoid direct frictional contact between the second pusher plate 5 and the drill barrel 1.

[0048] Sealing assembly: The sealing assembly is a sealing ring 10 disposed on the contact surface between the first pusher plate 2 and the drill barrel, to prevent cooling water from leaking from the contact surface between the first pusher plate 2 and the drill barrel 1; the sealing ring (10) is embedded in the circumferential groove of the first pusher plate (2).

[0049] Furthermore, a cutting edge is provided at the end of the drill barrel 1 away from the water inlet 13, and the inner diameter of the cutting edge is smaller than the inner diameter of the drill barrel and the outer diameter of the first pusher plate 2 and the second pusher plate 5, to prevent the first pusher plate 2 from falling out of the drill barrel during the process of pushing the rock core. Specifically, the cutting edge is connected to the drill barrel 1 by welding or threaded connection.

[0050] Furthermore, a hard alloy wear-resistant layer is inlaid on the surface of the second pusher plate 5, which is suitable for highly abrasive rock formations such as granite and quartzite.

[0051] Furthermore, in another embodiment, the spring 3 can be replaced with other elastic components with the same function, such as rubber elastomers or elastic gaskets.

[0052] Example 2

[0053] like Figure 5 The diagram illustrates a control method for a hydraulic core thruster. One end of the hydraulic core thruster, equipped with a water inlet, is connected to a drilling mechanism. The drilling mechanism drives the drill barrel to rotate and introduces cooling water into the water inlet. The control method specifically includes the following steps:

[0054] Drilling stage ( Figure 2 ):

[0055] When the second pusher plate 5 and the first pusher plate 2 stop at the cutting teeth, the drilling mechanism is started, the drill barrel 1 rotates at high speed and drills downward. The rock forms a rock core inside the drill barrel 1 and pushes the second pusher plate 5 and the first pusher plate 2 to move axially toward one end of the water inlet.

[0056] Centrifugal force: The valve core 4 is subjected to centrifugal force to overcome the preload of the spring 3 and moves radially outward, opening the water outlet hole with a diameter of A;

[0057] Water flow path: Cooling water is injected from the inlet 13 at the top of the drill barrel 1, flows through the outlet 11 opened by the valve core 4 and the water passage 12 of the second pusher plate 5 to the rock contact surface, so as to achieve drill bit cooling, lubrication and debris washing.

[0058] Wear-resistant design: The second pusher plate 5 rotates relative to or synchronously with the first pusher plate 2 and directly contacts the rock, avoiding wear and tear on the first pusher plate 2 due to friction.

[0059] Core pushing stage ( Figure 3 ):

[0060] When the drill barrel 1 drills to the designed depth, the drilling mechanism stops rotating, the centrifugal force of the valve core 4 disappears, the spring 3 pushes the valve core 4 to reset, and the water outlet 11 is closed.

[0061] Hydraulic energy storage: Continuous water injection forms a closed cavity between the drill barrel 1 and the first pusher plate 2. After the water pressure gradually increases to the set threshold, the high-pressure water pushes the first pusher plate 2 to push out the core at a constant speed (e.g., 2-5MPa, the specific water pressure value is set according to actual needs).

[0062] Core ejection: Water pressure pushes the first pusher plate 2 and the second pusher plate 5 to move axially along the drill barrel 1. Through mechanical linkage, the core is ejected from the bottom of the drill barrel at a constant speed to avoid the core breaking due to instantaneous impact force. Simultaneously, the drilling mechanism connected to the drill barrel reverses to pull the drill barrel out of the borehole.

[0063] Reset: After the core is pushed, stop water injection.

[0064] Furthermore, in the next drilling cycle, the first pusher plate 2 and the second pusher plate 5 are pushed into the drill barrel near the water inlet using the rock core.

[0065] The hydraulic core pusher device provided in this embodiment achieves automatic switching of water flow state between drilling and core pushing stages through the centrifugal motion of valve core 4, without the need for external control; the water flow is used for cooling and lubrication during drilling, and the closed water flow forms high pressure during core pushing to avoid water waste; and a second pusher plate 5 is provided to bear the friction effect to extend the service life of the first pusher plate 2.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hydraulic core-push device, characterized in that, include: The drill barrel (1) is a hollow cylindrical structure with a water inlet (13) at one end for cooling water to be introduced. The first pusher plate (2) is slidably installed in the inner cavity of the drill barrel (1) along the axial direction. The first pusher plate (2) is provided with an axially penetrating water outlet hole (11) and a radially arranged valve core mounting cavity. The valve core mounting cavity is connected to the water outlet hole (11) and contains a valve core (4) and an elastic component. The valve core (4) is radially moved and installed in the valve core mounting cavity. Under the pre-tightening force of the elastic component, it is in the initial position to close the water outlet (11) and moves outward under the action of centrifugal force to open the water outlet (11). The valve core mounting cavity is provided with a plug (9) at one end away from the water outlet (11) to fix the elastic component and close the valve core mounting cavity.

2. The hydraulic core-push device according to claim 1, characterized in that, Also includes: The second pusher plate (5) is arranged on the side of the first pusher plate (2) away from the water inlet (13), and the second pusher plate (5) is provided with a water passage hole (12).

3. The hydraulic core-push device according to claim 2, characterized in that: The outer edge of the second pusher plate (5) is fitted with the inner wall of the drill barrel (1) with a clearance.

4. The hydraulic core-push device according to claim 2, characterized in that: The surface of the second pusher plate (5) is inlaid with a hard alloy wear-resistant layer.

5. The hydraulic core-push device according to claim 2, characterized in that: A spacer ring (8) is provided between the first pusher plate (2) and the second pusher plate (5).

6. The hydraulic core-push device according to claim 2, characterized in that: The elastic component is a spring (3).

7. The hydraulic core-push device according to claim 2, characterized in that: A sealing assembly is provided at the contact surface between the first pusher plate (2) and the drill barrel (1) to prevent cooling water leakage.

8. The hydraulic core-push device according to claim 7, characterized in that: The sealing component is a sealing ring (10).

Images