A protective valve body and emulsion drilling rig using the same

Abstract

This utility model relates to the field of drilling equipment technology, specifically to providing a protective valve body, including a valve body and a main valve core disposed in an internal channel of the valve body. One end of the main valve core is an operating end extending out of the valve body, and the other end is a control end to realize the opening and closing of the valve body. A protective component is fixedly connected to the valve body at the corresponding operating end of the main valve core. The protective component includes a rigid member, one end of which is sealed and fixed to the valve body. The rigid member has a through slide rail inside, and the operating end of the main valve core is clearance-fitted in the slide rail. A secondary valve core is also slidably disposed in the slide rail. A soft protective sleeve completely covers the outer end of the rigid member and the protruding secondary valve core. This utility model can effectively solve the problem that the existing valve body structure is prone to wear and jamming during the use of emulsion drilling, which affects the reliability of valve body opening and closing.

Description

Technical Field

[0001] This utility model relates to the field of drilling equipment technology, specifically to a protective valve body and its emulsion drill. Background Technology

[0002] Handheld emulsion drilling rigs, as an important type of mining and tunneling equipment, are driven by hydraulics or emulsion and feature explosion-proof and powerful characteristics. They are widely used in drilling operations in coal and rock tunnels. The core operating component of this equipment is its control valve switch. The operator starts the drilling rig and provides continuous feed force to the drill bit by holding and triggering this switch.

[0003] In existing technologies, the valve core of an emulsion drill typically reciprocates directly within the valve body's inner bore. Because the extended valve core extends and retracts under pressure from an external connecting rod structure to open and close the valve body, the rotating connecting rod structure exerts a radial force on the valve core, causing uneven wear between the valve core and the valve body's inner bore. This uneven wear gradually widens the gap, leading to decreased valve core sealing performance, increased susceptibility to liquid leakage, and impacting the reliability of the valve's operation.

[0004] On the other hand, emulsion drills typically operate in high-dust environments such as coal mines and rock tunnels. At the exposed parts of the valve body, the valve core and connecting rod assembly are in direct contact with the outside air. The large amounts of coal dust and rock powder generated during drilling easily adhere to the valve core surface and are carried into the valve body by the reciprocating motion of the valve core. Under the action of the emulsion, this dust forms an abrasive-like slurry, exacerbating the wear between the valve core and the valve body bore, and even causing the valve core to jam in the guide position, thus leading to malfunction or reduced reliability of the valve's opening and closing action.

[0005] Some existing products provide some dust protection by hinged metal protective covers at the valve body extension, but the actual effect is poor. Therefore, this solution provides a dedicated valve body and valve core protection assembly to ensure the reliability of the valve body during operation. Utility Model Content

[0006] Technical problems to be solved

[0007] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a protective valve body and its emulsion drill, which can effectively solve the problem that the existing valve body structure is prone to wear and jamming during the use of emulsion drills, thus affecting the reliability of valve body opening and closing.

[0008] Technical solution

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] This utility model provides a protective valve body, including a valve body and a main valve core disposed in an internal channel of the valve body. One end of the main valve core is an operating end that extends out of the valve body, and the other end is a control end that realizes the opening and closing of the valve body. A protective member is fixedly connected to the valve body at the corresponding operating end of the main valve core. The protective member includes a rigid member, one end of which is sealed and fixed to the valve body. The rigid member has a through slide rail inside, and the operating end of the main valve core is clearance-fitted into the slide rail.

[0011] A secondary valve core is also slidably disposed in the slide rail. One end of the secondary valve core is in contact with the operating end of the main valve core, and the other end extends out of the rigid member.

[0012] A soft protective sleeve completely covers the outer end of the rigid member and the protruding secondary valve core, wherein a cavity is formed between the protective sleeve and the outer end face of the rigid member to accommodate the natural protrusion of the secondary valve core.

[0013] Another aspect of this utility model provides an emulsion drill, including an emulsion motor, the emulsion motor being connected to the aforementioned protective valve body, and also including a handheld bracket for mounting the emulsion motor, the handheld bracket being provided with a linkage mechanism for squeezing the protective sleeve and the secondary valve core.

[0014] Furthermore, the end face of the main valve core operating end is a hemispherical surface, and the contact surface between the auxiliary valve core and the main valve core is formed with a ball groove that matches the hemispherical surface.

[0015] Furthermore, the rigid member includes a sleeve and a shaft coaxially inserted into the sleeve. The shaft has a through slide rail inside, and the shaft can move axially along the sleeve. Both are provided with a locking structure to achieve relative fixation.

[0016] Furthermore, the inner hole of the sleeve includes an internal thread section and a limiting section, the inner diameter of the limiting section is smaller than the bottom diameter of the internal thread section, the shaft includes an external thread section that is threadedly engaged with the internal thread section, and a smooth shaft section, the smooth shaft section can pass through the inner hole of the limiting section, the valve body is provided with a threaded connection hole, and the rigid member is fixed to the valve body at the threaded connection hole through the external thread section of the shaft.

[0017] Furthermore, the optical axis segment is formed with a first step and a second step sequentially from the external thread segment, wherein the outer diameter of the first step is larger than that of the second step. When the external thread segment rotates to the limit position inside the sleeve, the first step is tightly embedded in the inner hole of the limiting segment, and the end face of the first step is flush with the outer end face of the limiting segment.

[0018] Furthermore, when the external thread section rotates to its limit position inside the sleeve, the end face of the first step, the outer end face of the limiting section, and the outer surface of the second step are adapted to the inner wall of the protective sleeve, and the protective sleeve is an elastic element with uniform wall thickness.

[0019] Furthermore, the protective sleeve is integrally formed and fixed to the sleeve by an overmolding process, and an annular positioning groove is formed on the outer surface of the sleeve. The retaining ring portion of the inner wall of the protective sleeve is injection molded and filled and fixed in the annular positioning groove.

[0020] Furthermore, the locking structure is achieved by providing a set of set screw holes in the sleeve and providing positioning holes corresponding to the set screw holes in the external thread section of the shaft. Set screws are connected in the set screw holes and positioning holes to fix the sleeve and shaft relatively. When the set screws are fixed, the end face of the second step is flush with the outer end face of the limiting section.

[0021] Furthermore, the external thread section of the shaft is provided with an anti-loosening bolt, and a sealing ring is provided at the contact surface between the anti-loosening bolt and the valve body.

[0022] Beneficial effects

[0023] The technical solution provided by this utility model has the following advantages compared with the known public technology:

[0024] This invention firstly utilizes an innovative "main valve core-subsidiary valve core" separate design within the slide rail. The secondary valve core is specifically responsible for bearing the radial force and possible off-center load from the external linkage mechanism. As a result, the main valve core is always in an ideal axial movement state within the valve body hole, effectively avoiding the off-center wear phenomenon caused by radial force.

[0025] Meanwhile, a soft protective sleeve completely covers the protruding end of the secondary valve core and the head of the rigid component, forming a sealed cavity that completely isolates the external high-dust environment. Coal dust, rock powder, and other pollutants cannot contact or adhere to the moving parts, preventing valve core wear and movement jamming caused by dust, thus ensuring the reliability of the valve's opening and closing actions. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the emulsion drill structure of this utility model;

[0028] Figure 2 This is a schematic diagram showing the connection between the protective component and the valve body of this utility model;

[0029] Figure 3 This is a top view showing the connection between the protective component and the valve body of this utility model;

[0030] Figure 4 for Figure 3 Schematic diagram of the BB cross section;

[0031] Figure 5 This is an overall perspective view of the protective component of this utility model;

[0032] Figure 6 A schematic diagram of a rigid component acting as a support shaft within a sleeve.

[0033] Figure 7 A schematic diagram of a rigid component serving as the "front mold" functional shaft within the sleeve;

[0034] Figure 8 This is a schematic diagram of the protective sleeve of this utility model being fixed on the sleeve;

[0035] Figure 9 This is a perspective view of the shaft structure of this utility model;

[0036] The labels in the diagram represent: 10, valve body; 11, main valve core; 12, threaded connection hole; 13, hemispherical surface; 20, sleeve; 21, internal thread section; 22, limiting section; 23, annular positioning groove; 24, set screw hole; 30, shaft; 31, slide rail; 32, external thread section; 33, first step; 34, second step; 35, positioning hole; 40, protective sleeve; 41, retaining ring; 50, secondary valve core; 51, ball groove; 60, anti-loosening bolt; 70, sealing ring; 80, emulsion motor; 90, handheld support; 91, linkage mechanism. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0038] The present invention will be further described below with reference to the embodiments.

[0039] Example:

[0040] This utility model provides an emulsion drill, as described in the reference. Figure 1-9 This includes an emulsion motor 80, which drives the emulsion drill, connected to a protective valve body 10, and a handheld bracket 90 for mounting the emulsion motor 80. The handheld bracket 90 has a linkage mechanism 91 for pressing the protective sleeve 40 and the auxiliary valve core 50. This is the basic structural composition of the emulsion drill, which will not be elaborated upon here. The core of this product is to address the problem of stress wear and dust damage to the valve core's reliable operation in the existing emulsion motor 80's switching valve body 10 during actual drilling operations.

[0041] Below is a dedicated protective valve body 10 designed for the emulsion motor 80 in this solution. It includes the valve body 10 and a main valve core 11 housed within an internal channel of the valve body 10. One end of the main valve core 11 is the operating end, extending out of the valve body 10, while the other end is the control end, enabling the valve body 10 to open and close. The core design feature of this solution is that a protective component is fixedly connected to the valve body 10 at the corresponding operating end of the main valve core 11. This protective component includes a rigid member, one end of which is sealed and fixed to the valve body 10. The rigid member has a through-flow slide 31 inside, and the operating end of the main valve core 11 is clearance-fitted within the slide 31.

[0042] A secondary valve core 50 is slidably disposed within the slide rail 31. The secondary valve core 50 is located outside the main valve core 11, with one end of the secondary valve core 50 in contact with the operating end of the main valve core 11, and the other end extending out of the rigid member. Preferably, in the design of the contact surface between the two, the end face of the operating end of the main valve core 11 is a hemispherical surface 13, and the contact surface between the secondary valve core 50 and the main valve core 11 forms a ball groove 51 that matches the hemispherical surface 13. The spherical structure design of the hemispherical surface 13 at the end of the main valve core 11 and the ball groove 51 of the secondary valve core 50 allows for automatic alignment, ensuring effective transmission of axial force even when the secondary valve core 50 has a slight misalignment after being subjected to radial force, thus avoiding the formation of harmful bending moments. Specifically, the slide 31 has a stepped surface with a smaller inner diameter on one side of the auxiliary valve core 50 to prevent detachment, and the shape of the auxiliary valve core 50 matches it. In actual installation, the auxiliary valve core 50 is first inserted through the large diameter end of the slide 31, and then the whole assembly is inserted into the outside of the main valve core 11.

[0043] The innovative "main valve core 11 - auxiliary valve core 50" separate design in the slide rail 31 utilizes the auxiliary valve core 50 to specifically bear the radial force and possible off-center load from the external linkage mechanism 91. As a result, the main valve core 11 is always in an ideal axial movement state within the valve body 10 hole, effectively avoiding the off-center wear phenomenon caused by radial force.

[0044] The system also includes a soft protective sleeve 40 that completely covers the outer end of the rigid component and the protruding secondary valve core 50. A cavity is formed between the protective sleeve 40 and the outer end face of the rigid component to accommodate the naturally protruding secondary valve core 50. Specifically, the protective sleeve 40 is integrally molded and fixed to the rigid component using an overmolding process. Its main body is an elastic sleeve made of TPE material with uniform wall thickness. By completely covering the protruding end of the secondary valve core 50 and the head of the rigid component with the soft protective sleeve 40, a sealed cavity is formed, completely isolating the external high-dust environment. Pollutants such as coal dust and rock powder cannot contact or adhere to the moving parts, preventing valve core wear and movement jamming caused by dust, thus ensuring the reliability of the valve body 10's opening and closing action.

[0045] The specific structure of the rigid component and the molding process of the protective sleeve 40 in this embodiment will be described in detail below. The movable design of the rigid component in this solution not only meets functional requirements but also serves as the pre-mold for the overmolding injection molding of the protective sleeve 40. It is not merely a connecting structure but also a highly ingenious integrated process-structure design, which will be explained in detail below.

[0046] Specifically, the rigid component includes a sleeve 20 and a shaft 30 coaxially inserted into the sleeve 20. The shaft 30 has a through slide 31 inside. The shaft 30 can move along the axial direction of the sleeve 20. Both components are provided with a locking structure to achieve relative fixation. In this embodiment, the sleeve 20 and the shaft 30 are preferably CNC machined parts made of 304 stainless steel.

[0047] The shaft 30, which can move and adjust within the sleeve 20, is specifically designed with a threaded connection. The sleeve 20's inner bore includes an internal thread section 21 and a limiting section 22. The shaft 30 includes an external thread section 32 that threadedly engages with the internal thread section 21, and a smooth shaft section. The smooth shaft section passes through the inner bore of the limiting section 22. The inner diameter of the limiting section 22 is smaller than the bottom diameter of the internal thread section 21. The limiting section 22 restricts the shaft 30 to its extreme position within the sleeve 20. When the shaft 30 rotates to its extreme position within the sleeve 20, the outer surface of the rigid component's main body on the side of the auxiliary valve core 50 can be used as a pre-mold for the injection molding process of the protective sleeve 40.

[0048] In terms of detailed dimensional optimization, the optical axis segment, starting from the external thread segment 32, sequentially forms a first step 33 and a second step 34. The outer diameter of the first step 33 is larger than that of the second step 34. When the external thread segment 32 rotates to its limit position within the sleeve 20, the first step 33 is tightly embedded in the inner hole of the limiting segment 22, and the end face of the first step 33 is flush with the outer end face of the limiting segment 22. Thus, when the external thread segment 32 rotates to its limit position within the sleeve 20, the end face of the first step 33, the outer end face of the limiting segment 22, and the outer surface of the second step 34 are adapted to the inner wall of the protective sleeve 40, which is an elastic element with uniform wall thickness.

[0049] The principle of the "front mold" for the overmolding process of the protective sleeve 40 is as follows: Since the protective sleeve 40 is integrally formed on the sleeve 20, during the overmolding injection molding, a rigid component needs to be placed into the mold cavity as a base component. In this solution, the structural design of the rigid component allows its main body to be clamped and fixed within the mold cavity, and its outer surface can serve as the front mold. When performing the overmolding injection molding of the soft protective sleeve 40, the sleeve 20 and the adjusted and extended shaft 30 are placed into the mold as a single sub-part. At this time, the smooth shaft section and the second step 34 of the extended shaft 30 precisely occupy the shape of the future internal cavity of the protective sleeve 40. When the molten elastomer is injected into the mold cavity, it will form around the shaft 30, thus naturally forming a smooth, sealed cavity inside the protective sleeve 40 that perfectly matches the movement trajectory of the secondary valve core 50. It is worth noting that the mold is equipped with sealing ejector pins for the holes in the slide 31.

[0050] Naturally, rotating and retracting the shaft 30 completes the demolding of the front mold of the protective sleeve 40. To ensure the fixation of the protective sleeve 40 outside the casing 20, an annular positioning groove 23 is preferably formed on the outer surface of the casing 20, and the retaining ring 41, which is injection molded on the inner wall of the protective sleeve 40, fills and fixes it in the annular positioning groove 23. The overmolding process integrates the sleeve with the casing 20, and the retaining ring 41 inside is filled and fixed in the annular positioning groove 23, ensuring a firm connection that will never fall off. Compared with simple sleeve or adhesive bonding, this design has stronger anti-aging and anti-fatigue capabilities, can adapt to harsh downhole working conditions and frequent operational impacts, and ensures the long-term effectiveness of the protection.

[0051] The rotational retraction dimension of the shaft 30 is controlled by a locking structure. The shaft 30 and sleeve 20, when retracted into position, serve as functional components for guiding and protecting the movement of the auxiliary valve core 50 to the main valve core 11. Specifically, the locking structure is achieved by providing a set of set screw holes 24 in the sleeve 20 and positioning holes 35 on the external threaded section 32 of the shaft 30, which correspond one-to-one with the set screw holes 24. Set screws are connected in the set screw holes 24 and the positioning holes 35 to fix the sleeve 20 and the shaft 30 relative to each other. When the set screws are fixed, the end face of the second step 34 is flush with the outer end face of the limiting section 22, which is the rigid member posture of the shaft 30 when it has rotated back into position.

[0052] During actual installation, this protective component is fixed to the valve body 10 at the threaded connection hole 12 by the threaded connection hole 12 on the valve body 10 via the external threaded section 32 of the shaft 30. To reduce the possibility of vibration-induced detachment, an anti-detachment bolt 60 is provided on the external threaded section 32 of the shaft 30. A sealing ring 70 is provided at the contact surface between the anti-detachment bolt 60 and the valve body 10, ensuring a stable connection and good sealing effect.

[0053] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A guard valve, comprising a valve body and a main valve core arranged in the internal channel of the valve body, one end of the main valve core is an operating end extending out of the valve body, and the other end is a control end to realize the opening and closing of the valve body, characterized in that: A protective component is fixedly connected to the valve body at the operating end of the corresponding main valve core. The protective component includes: A rigid component is sealed and fixed at one end to the valve body. The rigid component has a through slide rail inside, and the operating end of the main valve core is clearance-fitted into the slide rail. A secondary valve core is also slidably disposed in the slide rail. One end of the secondary valve core is in contact with the operating end of the main valve core, and the other end extends out of the rigid member. A soft protective sleeve completely covers the outer end of the rigid member and the protruding secondary valve core, wherein a cavity is formed between the protective sleeve and the outer end face of the rigid member to accommodate the natural protrusion of the secondary valve core.

2. A guard valve according to claim 1, wherein The rigid member includes a sleeve and a shaft coaxially inserted into the sleeve. The shaft has a through slide rail inside. The shaft can move along the axial direction of the sleeve, and a locking structure is provided between the two to achieve relative fixation.

3. A guard valve according to claim 2, wherein The inner bore of the sleeve includes an internal thread section and a limiting section. The inner diameter of the limiting section is smaller than the bottom diameter of the internal thread section. The shaft includes an external thread section that is threaded to the internal thread section and a smooth shaft section. The smooth shaft section can pass through the inner bore of the limiting section. The valve body has a threaded connection hole. The rigid member is fixed to the valve body at the threaded connection hole through the external thread section of the shaft.

4. A guard valve according to claim 3, wherein The optical axis segment has a first step and a second step formed sequentially from the external thread segment. The outer diameter of the first step is larger than that of the second step. When the external thread segment rotates to its limit position inside the sleeve, the first step is tightly embedded in the inner hole of the limiting segment, and the end face of the first step is flush with the outer end face of the limiting segment.

5. A guard valve according to claim 4, wherein When the external thread section rotates to its limit position inside the sleeve, the end face of the first step, the outer end face of the limiting section, and the outer surface of the second step are adapted to the inner wall of the protective sleeve, and the protective sleeve is an elastic element with uniform wall thickness.

6. A guard valve according to claim 5, wherein The protective sleeve is integrally formed and fixed to the sleeve by a rubber coating process. An annular positioning groove is formed on the outer surface of the sleeve, and the retaining ring part of the inner wall of the protective sleeve is filled and fixed in the annular positioning groove.

7. A guard valve according to claim 6, wherein The locking structure is achieved by providing a set of set screw holes in the sleeve and providing positioning holes corresponding to the set screw holes in the external thread section of the shaft. Set screws are connected in the set screw holes and positioning holes to fix the sleeve and shaft relatively. When the set screws are fixed, the end face of the second step is flush with the outer end face of the limiting section.

8. A guard valve according to claim 7, wherein The external thread section of the shaft is provided with an anti-loosening bolt, and a sealing ring is provided at the contact surface between the anti-loosening bolt and the valve body.

9. A guard valve according to claim 1, wherein The end face of the main valve core operating end is a hemispherical surface, and the contact surface between the auxiliary valve core and the main valve core forms a ball groove that matches the hemispherical surface.

10. An emulsion drilling fluid, characterized in that, The device includes an emulsion motor, on which a protective valve body as described in any one of claims 1-9 is connected, and also includes a handheld bracket for mounting the emulsion motor, wherein the handheld bracket is provided with a linkage mechanism for squeezing the protective sleeve and the auxiliary valve core.

Images