Anti-erosion water cap for screw drill

Abstract

The utility model relates to the technical field of screw drilling tools, in particular to an anti-erosion water cap for a screw drilling tool, which comprises a water cap, a vertical hole and a transverse hole, the vertical hole and the transverse hole are arranged in the water cap, coatings are arranged on the inner surfaces of the vertical hole and the transverse hole, and intersecting lines of the vertical hole and the transverse hole are chamfered. According to the utility model, the strength of the inner walls of the vertical hole and the transverse hole can be increased through the arrangement of the plating layer, the situation that the vertical hole and the transverse hole are quickly corroded and the service life of the device is influenced is prevented, and the intersecting line of the vertical hole and the transverse hole is chamfered, so that the contact area between the intersecting line and the plating layer is increased, and the use strength of the plating layer at the intersecting line is ensured; according to the water cap, the corrosion resistance of the interior of the water cap is further guaranteed, the erosion and corrosion prevention effect can be guaranteed by selecting hard chromium as the material of the plating layer and setting the strength of the hard chromium to be larger than 800 HV, the hard chromium is not prone to falling off due to the fact that the thickness of the hard chromium is set to be larger than 0.3 mm, and the corrosion resistance of the hard chromium can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of screw drill technology, specifically to a water cap for preventing erosion in screw drills. Background Technology

[0002] Currently, the service life of water caps for screw drills is generally around 200 hours. After use, the inner hole is severely eroded and cannot be reused. The strength is reduced after erosion, and the rough inner hole is prone to cracking under high stress. Some foreign manufacturers use advanced technology to apply supersonic tungsten carbide coating to the eroded surface, which can extend the service life to more than 500 hours. However, due to the small structure and size of the water cap, the equipment required for spraying is too precise and complex, which affects its practical effect.

[0003] Therefore, a water cap for preventing erosion in screw drill bits is proposed to solve the problems mentioned above. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an anti-erosion water cap for screw drills, which can solve the problems of low corrosion resistance and high processing equipment costs.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a water cap, and vertical holes and horizontal holes formed inside the water cap, wherein the inner surfaces of the vertical holes and the horizontal holes are coated, and the intersection of the vertical holes and the horizontal holes is chamfered.

[0006] Preferably, the coating is obtained by electroplating, and the electroplating material is hard chrome.

[0007] Preferably, the electroplating thickness of the coating is set to 'a', and 'a' > 0.3 mm.

[0008] Preferably, the electroplating intensity of the coating is set to b, and b > 800 HV.

[0009] Preferably, the adjacent surfaces of the inner wall of the vertical hole and the inner wall of the horizontal hole are the inner wall of the vertical hole and the inner wall of the horizontal hole, respectively, and the connection between the inner wall of the vertical hole and the inner wall of the horizontal hole is an intersecting line.

[0010] Preferably, the intersection line is rounded to form a transition angle, and the rounding angle of the transition angle is set to R, where R = 3.

[0011] Preferably, the mud flows from the vertical hole into the horizontal hole.

[0012] Compared with the prior art, this utility model provides an anti-erosion water cap for screw drills, which has the following beneficial effects:

[0013] 1. The overcoating can increase the strength of the inner walls of the vertical and horizontal holes, preventing them from being rapidly corroded and affecting the service life of the device. By chamfering the intersection of the vertical and horizontal holes, the contact area between the coating and the hole is increased, ensuring the strength of the coating at that point and further guaranteeing the corrosion resistance of the water cap.

[0014] 2. By selecting hard chrome as the coating material and setting the hard chrome strength to be greater than 800 HV, the anti-impact and corrosion effect can be guaranteed. Setting the hard chrome thickness to be greater than 0.3 mm makes it less likely to fall off, thus ensuring its corrosion resistance.

[0015] 3. An inner coating is added. Due to the high hardness of the coating, erosion of the inner walls of the vertical and horizontal holes is prevented, thus protecting the water cap substrate from damage and extending the service life of the water cap. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the vertical cross-section structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure at the intersection line of this utility model;

[0019] Figure 4 This is a schematic diagram of the mud flow structure of this utility model.

[0020] In the diagram: 1. Water cap; 2. Coating; 3. Vertical hole; 301. Inner wall of vertical hole; 4. Horizontal hole; 401. Inner wall of horizontal hole; 5. Transition angle. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example:

[0023] Please see Figure 1 - Figure 4 In this embodiment, a water cap for preventing erosion of a screw drill includes a water cap 1, and a vertical hole 3 and a horizontal hole 4 opened inside the water cap 1. The inner surfaces of the vertical hole 3 and the horizontal hole 4 are both provided with a coating 2, and the intersection of the vertical hole 3 and the horizontal hole 4 is beveled.

[0024] Since the water cap 1 is based on existing technology, and its opening method and the state after opening are also well-known to those skilled in the art, it has not been described in detail in this embodiment and the accompanying drawings.

[0025] At this time, the setting of coating 2 can increase the strength of the inner walls of vertical hole 3 and horizontal hole 4, prevent them from being rapidly corroded, and affect the service life of the device. By chamfering the intersection line of vertical hole 3 and horizontal hole 4, the contact area with coating 2 at this point is increased, ensuring the strength of coating 2 at this point, and further ensuring the corrosion resistance of water cap 1.

[0026] With the chamfering treatment at the intersection of the vertical hole 3 and the horizontal hole 4, and the plating layer 2 inside the vertical hole 3 and the horizontal hole 4, the device has a high strength anti-corrosion effect, effectively preventing the water cap 1 from becoming weak due to erosion. Erosion makes the inner walls of the vertical hole 3 and the horizontal hole 4 rough, which can easily cause cracks when subjected to high stress and affect the service life of the water cap 1.

[0027] The plating layer 2 is obtained by electroplating, and the electroplating material for the plating layer 2 is hard chrome;

[0028] The electroplating thickness of coating 2 is set to 'a', and 'a' > 0.3 mm;

[0029] The electroplating intensity of coating 2 is set to b, and b > 800 HV;

[0030] By selecting hard chrome as the material for plating layer 2 and setting the hard chrome strength to be greater than 800 HV, the anti-impact and corrosion effect can be guaranteed. Setting the thickness of hard chrome to be greater than 0.3 mm makes it less likely to fall off, thus ensuring its corrosion resistance.

[0031] The adjacent surfaces of the inner wall of the vertical hole 3 and the inner wall of the horizontal hole 4 are the inner wall of the vertical hole 301 and the inner wall of the horizontal hole 401, respectively, and the connection between the inner wall of the vertical hole 301 and the inner wall of the horizontal hole 401 is an intersection line.

[0032] The intersection line is rounded to form a transition angle 5, and the rounding angle of the transition angle 5 is set to R, and R = 3;

[0033] The mud flows from vertical hole 3 into horizontal hole 4;

[0034] By rounding the corners R3 of the intersection line between the vertical hole 3 and the horizontal hole 4 inside the water cap 1, the burrs generated by electroplating flash can be reduced, and the stability of the coating 2 connection can be improved.

[0035] The working principle of the above embodiments is as follows:

[0036] When using it, the first step is to reprocess the original water cap 1, and round the corners R3 of the intersection of the vertical hole 3 and the horizontal hole 4. The second step is to design a special electroplating fixture according to the size of the water cap 1. The third step is to determine the electroplating process to ensure that the plating thickness is >0.3mm and does not fall off. The fourth step is to remove hydrogen. The main purpose of the hydrogen removal treatment is to prevent hydrogen embrittlement from causing cracks that affect downhole safety.

[0037] The function of the water cap 1 is to collect the mud inside the screw from outside the water cap 1. The mud flows first through the vertical hole 3 inside the water cap 1 to the horizontal hole 4. During the change of flow direction, cavitation occurs, causing the inner walls of the vertical hole 3 and the horizontal hole 4 to be eroded, gradually reducing the substrate. The inner hole is coated with a plating layer 2. Because the plating layer 2 has a very high hardness, it prevents erosion inside the vertical hole 3 and the horizontal hole 4, thus protecting the substrate of the water cap 1 from damage and extending its service life.

[0038] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. As long as they can achieve their beneficial effects, they can be implemented. Therefore, this embodiment will not elaborate on their specific structural composition and working principle.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water cap for preventing erosion in screw drills, characterized in that: It includes a water cap (1), and a vertical hole (3) and a horizontal hole (4) opened inside the water cap (1). The inner surfaces of the vertical hole (3) and the horizontal hole (4) are both provided with a coating (2), and the intersection of the vertical hole (3) and the horizontal hole (4) is chamfered.

2. The anti-erosion water cap for a screw drill bit according to claim 1, characterized in that: The plating layer (2) is obtained by electroplating, and the electroplating material of the plating layer (2) is hard chromium.

3. The anti-erosion water cap for screw drills according to claim 1, characterized in that: The plating thickness of the coating (2) is set to a, and a>0.3mm.

4. The anti-erosion water cap for a screw drill bit according to claim 1, characterized in that: The electroplating intensity of the coating (2) is set to b, and b>800HV.

5. The anti-erosion water cap for a screw drill bit according to claim 1, characterized in that: The adjacent surfaces of the inner wall of the vertical hole (3) and the inner wall of the horizontal hole (4) are the inner wall of the vertical hole (301) and the inner wall of the horizontal hole (401), respectively, and the connection between the inner wall of the vertical hole (301) and the inner wall of the horizontal hole (401) is an intersecting line.

6. The anti-erosion water cap for a screw drill bit according to claim 5, characterized in that: The intersection line is rounded to form a transition angle (5), and the rounding angle of the transition angle (5) is set to R, and R = 3.

7. The anti-erosion water cap for a screw drill bit according to claim 1, characterized in that: The mud flows from the vertical hole (3) into the horizontal hole (4).

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