Method for Achieving Dual Friction Forces by Arranging Kava Colloidal Ring Array

Abstract

This invention belongs to the technical field of drill pipe clamping devices. It relates to a method for achieving dual frictional force through a ring-shaped array of colloidal slips. The slips encircle and clamp the object, each slip comprising a flexible colloidal body and a base. The flexible colloidal body includes a flexible substrate and flexible strips. An arc-shaped groove is provided within the base, and the flexible substrate is disposed within the arc-shaped groove. The flexible strips are convex and located on the inner arc side of the flexible substrate, making flexible contact with the object being clamped. Each flexible strip consists of two colloidal teeth made of different materials, forming one side with hard teeth and the other side with soft teeth. The magnitude of the frictional force between the slips and the object is changed by adjusting the number of flexible strips and / or adjusting the relative position between the hard and soft teeth within the flexible strips. This invention utilizes the different properties of hard and soft teeth to generate two different frictional forces in the colloidal slips during forward and reverse rotation of the active drill pipe, ensuring smooth engagement and disengagement.

Description

Technical Field

[0001] This invention belongs to the technical field of drill pipe clamping devices, and relates to a method for achieving dual frictional force by arranging colloidal slips in a ring array. Background Technology

[0002] A coal mine drilling rig is a piece of equipment used for drilling in coal mines. Automatic underground coal mine drilling rigs use slips to clamp the drill rod, and work with other components of the rig to automatically raise and lower the drill rod.

[0003] The automatic attachment of the clamped object is accomplished by a power head working in conjunction with slips. The power head needs to perform two actions: forward rotation for attachment and reverse rotation for retraction. During attachment, the slips clamp the object, and the power head's active drill rod rotates forward to engage with the object. The active drill rod drives the object to rotate, creating a relative sliding tendency between the object and the slips, generating a circumferential friction force F1, thus completing the engagement. During retraction, the power head's active drill rod rotates in reverse. At this time, static friction occurs between the object and the slips, generating a circumferential friction force F2. Under the action of this friction force, the active drill rod completes the retraction. To ensure smooth engagement and retraction, F2 must be greater than F1. Since the clamping force of the slips is determined by the push cylinder, meeting the different needs of engagement and retraction can only be achieved by adjusting the cylinder pressure, making the hydraulic system structure complex. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to solve the above problems and provide a method for achieving dual friction force by arranging colloidal slips in a ring array. By arranging colloidal slips in a ring array, the friction force between the slips and the drill rod is differentiated when the drill rod is lowered or raised, preventing the drill rod from slipping when lowering it and ensuring smooth lowering of the drill rod, thereby simplifying the design of the drilling rig hydraulic system.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for achieving dual friction force by arranging colloidal colloids in a ring array, wherein the colloidal colloids are used to clamp the object, the colloidal colloids comprising a flexible colloid and a base; the flexible colloid comprising a flexible substrate and a flexible strip; the base having an arc-shaped groove, the flexible substrate being disposed in the arc-shaped groove; the flexible strip being convexly disposed on the inner arc side of the flexible substrate, and in flexible contact with the object being clamped;

[0007] The flexible strip consists of two colloidal teeth made of different materials, forming a hard tooth on one side and a soft tooth on the other side; there are multiple flexible strips, which are spaced apart on the inner arc side of the flexible substrate; the object being clamped is simultaneously pressed and contacted with the hard tooth and the soft tooth. Because the hard tooth and the soft tooth generate different circumferential friction forces on the object being clamped, the circumferential friction forces experienced by the object being clamped are different when it rotates forward and backward; and the magnitude of the friction force of the clamping slip on the object is changed by adjusting the number of flexible strips and / or adjusting the relative position between the hard tooth and the soft tooth in the flexible strip.

[0008] Furthermore, the flexible strips are arranged in a ring array, and the relative positions of the hard teeth and soft teeth in each flexible strip are the same.

[0009] Furthermore, the flexible strips are arranged in a circular array, and the relative positions of the hard teeth and soft teeth in two adjacent flexible strips are opposite.

[0010] Furthermore, the flexible colloid is fixed in the arc-shaped groove by adhesive bonding.

[0011] Furthermore, the opening end of the arc-shaped groove is provided with a retaining tooth, which contacts the end face of the flexible colloid and clamps the flexible colloid into the arc-shaped groove.

[0012] Furthermore, the base is also provided with screw holes for connecting the thrust mechanism.

[0013] Furthermore, the hard teeth and soft teeth are bonded together as a single unit.

[0014] Furthermore, the flexible substrate is composed of multiple substrates; each colloidal tooth corresponds to one substrate and is integrally formed with the substrate.

[0015] Furthermore, the flexible substrate is composed of multiple substrates, with colloidal teeth disposed on the substrates, and some substrates have colloidal teeth integrally formed with the substrates at both ends.

[0016] Furthermore, the base is made of metal.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. In this invention, the slips utilize colloidal teeth made of different materials, forming soft and hard teeth. Due to the different material properties, their coefficients of friction and deformation vary. Therefore, the deformation of the colloidal teeth differs when the active drill pipe rotates forward to engage and reverses to disengage, resulting in differences in the frictional force exerted by the colloidal teeth on the clamped object. This property is utilized to generate two different frictional forces in the colloidal slips during the forward and reverse rotation of the active drill pipe, ensuring smooth engagement and disengagement.

[0019] 2. The slips in this invention are made of flexible material, which can achieve non-damaging clamping of low-strength material equipment such as drill rods. The clamped objects and other devices are automatically attached and lowered into the borehole, reducing the workload, improving the degree of automation and safety of construction, and expanding the functions of the drilling rig.

[0020] Other advantages, objectives, and features of the 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, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a kava colloidal ring array arrangement structure in the present invention.

[0023] Figure 2 This is another type of Kava colloid ring array arrangement structure in this invention.

[0024] Figure 3 This is a schematic diagram of the base structure.

[0025] Reference numerals: 01-Flexible colloid; 02-Base; 03-Drill rod; 013-Soft tooth; 014-Hard tooth; 021-Clamping tooth; 022-Screw hole. Detailed Implementation

[0026] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the 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.

[0028] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, 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 the present invention 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 the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] A method for achieving dual frictional force using a colloidal ring array of slips, employing slips to clamp the object in a ring-like arrangement, the slip structure being as follows: Figures 1-3 As shown, the device includes a flexible colloid 01 and a base 02. The flexible colloid 01 includes a flexible substrate and flexible strips. The base 02 has an arc-shaped groove, and the flexible substrate is disposed in the arc-shaped groove. The flexible strips are convex and disposed on the inner arc side of the flexible substrate, making flexible contact with the object being clamped. The flexible strips are composed of two colloid teeth made of different materials, forming one side with hard teeth 014 and the other side with soft teeth 013. There are multiple flexible strips, which are spaced apart on the inner arc side of the flexible substrate and arranged in parallel. The object being clamped is simultaneously pressed and contacted by both the hard teeth 014 and the soft teeth 013. Due to the different circumferential friction forces generated by the hard teeth 014 and the soft teeth 013 on the object being clamped, the circumferential friction forces experienced by the object being clamped are different when rotating forward and backward. The magnitude of the friction force between the clamp and the object is changed by adjusting the number of flexible strips and / or adjusting the relative position between the hard teeth 014 and the soft teeth 013 in the flexible strips.

[0030] The base 02 is made of metal, and the flexible colloid 01 is made of rubber. The flexible colloid 01 is fixed in the arc-shaped groove by adhesive bonding. The hard teeth 014 and the soft teeth 013 are bonded together. The open end of the arc-shaped groove is provided with a retaining tooth 021, which contacts the end face of the flexible colloid 01 to hold the flexible colloid 01 tightly in the arc-shaped groove. The base 02 is also provided with a screw hole 022 for connecting the thrust mechanism.

[0031] The following provides two methods for arranging circular arrays to achieve the function of dual friction force, and elaborates on the application of this method.

[0032] Method 1: Single-interval array arrangement. For example... Figure 1 As shown, the flexible strips are arranged in a ring array. The hard teeth 014 and soft teeth 013 in each flexible strip are in the same relative position. The flexible substrate is composed of multiple substrates. Each colloidal tooth corresponds to one substrate and is integrally formed with the substrate. This arrangement is used for the upper and lower drill pipes 03.

[0033] The drill rod 03 is positioned between the two jaws and remains stationary. The two jaws move towards each other on the same plane under the pressure of the hydraulic mechanism until the jaw teeth 021 contact each other. At this point, the drill rod 03 contacts and compresses the flexible strip, thereby generating a compressive force sufficient to hold the drill rod 03 securely in place.

[0034] In the reverse (clockwise) direction of drill pipe 03, more hard teeth 014 are contacted first, providing greater friction.

[0035] The advantages of this arrangement are: it provides strong reverse friction, reducing shackle slippage; at the same time, the rotary hydraulic system can reduce the pressure difference between forward and reverse rotation, or even be designed to have the same pressure, simplifying the design and use of the hydraulic system.

[0036] Method 2: Double-interval array arrangement. For example... Figure 2 As shown, the flexible strips are arranged in a ring array. The relative positions of the hard teeth 014 and soft teeth 013 in two adjacent flexible strips are opposite. The flexible substrate is composed of multiple substrates, and the colloidal teeth are all located on the substrates. Some substrates have colloidal teeth integrally formed with the substrates at both ends. This arrangement is used for low-strength or high-brittle non-metallic materials (hereinafter collectively referred to as clamped materials) such as self-sealing devices and ceramic joints.

[0037] The object being clamped is positioned between the two jaws and remains stationary. Under the pressure of the hydraulic mechanism, the two jaws move towards each other on the same plane until the clamping teeth 021 contact each other. At this point, the object being clamped comes into contact with the flexible strip and compresses it, thereby generating a compressive force. This force is sufficient to meet the clamping requirements of the jaws and is less than the destructive force on the object, thus preventing damage to the object.

[0038] In the reverse direction (clockwise) of the clamped object, more hard teeth 014 make contact first, providing greater friction.

[0039] The advantages of this arrangement are: the flexible colloid 01 structure is relatively simple and quick to install; the friction force in reverse rotation is slightly greater than that in forward rotation, reducing the risk of slippage of the shackle.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention 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 solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for achieving dual frictional forces through a Kava colloid annular array arrangement, characterized in that: The clamping device uses a clasp to hold the object in a circular gripping manner. The clasp includes a flexible colloid and a base. The flexible colloid includes a flexible substrate and a flexible strip. The base has an arc-shaped groove, and the flexible substrate is disposed in the arc-shaped groove. The flexible strip is convex and disposed on the inner arc side of the flexible substrate, making flexible contact with the object being clamped. The flexible strip consists of two colloidal teeth made of different materials, forming a hard tooth on one side and a soft tooth on the other. There are multiple flexible strips, which are spaced apart on the inner arc side of the flexible substrate. The object being clamped is simultaneously pressed and contacted with both the hard and soft teeth. Due to the different circumferential friction forces generated by the hard and soft teeth on the object, the circumferential friction forces experienced by the object when rotating clockwise and counterclockwise are different. The magnitude of the friction force exerted by the clamping slip on the object can be changed by adjusting the number of flexible strips and / or adjusting the relative position between the hard and soft teeth in the flexible strips. The opening end of the arc-shaped groove is provided with a retaining tooth, which contacts the end face of the flexible colloid and clamps the flexible colloid into the arc-shaped groove; the hard tooth and the soft tooth are bonded together as one piece.

2. The method for achieving dual frictional force by arranging colloidal ring arrays according to claim 1, characterized in that: The flexible strips are arranged in a ring array, and the hard teeth and soft teeth in each flexible strip are in the same relative position.

3. The method for achieving dual frictional forces by arranging colloidal ring arrays according to claim 1, characterized in that: The flexible strips are arranged in a circular array, and the relative positions of the hard teeth and soft teeth in two adjacent flexible strips are opposite.

4. The method for achieving dual frictional force by arranging colloidal ring arrays according to claim 1, characterized in that: The flexible colloid is fixed in the arc-shaped groove by bonding.

5. The method for achieving dual frictional force by arranging colloidal ring arrays according to claim 1, characterized in that: The base is also provided with screw holes for connecting the thrust mechanism.

6. The method for achieving dual frictional force by arranging colloidal ring arrays according to claim 2, characterized in that: The flexible substrate is composed of multiple substrates; each colloidal tooth corresponds to one substrate and is integrally formed with the substrate.

7. The method for achieving dual frictional force by arranging colloidal ring arrays according to claim 3, characterized in that: The flexible substrate is composed of multiple substrates, with colloidal teeth disposed on the substrates, and some substrates have colloidal teeth integrally formed with the substrates at both ends.

8. The method for achieving dual frictional force by arranging colloidal ring arrays according to claim 1, characterized in that: The base is made of metal.

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