Split type drill rod clamp holder

Abstract

The utility model relates to the field of drilling machine clamping equipment, and discloses a split type drill rod holder which comprises a base and two clamping mechanisms symmetrically arranged on the two sides of the base, each clamping mechanism comprises a power piece and a clamping unit, each clamping unit comprises an inner slip and an outer slip, the inner slip is detachably installed on the inner side of the outer slip, and the outer slip is detachably installed on the inner side of the outer slip. And the outer slip is connected with the power piece. According to the scheme, the problem that an existing clamp holder is only suitable for drilling tools with one outer diameter after being assembled can be solved.

Description

Technical Field

[0001] The utility model relates to the field of drilling rig clamping equipment, in particular to a split drill rod clamp. Background Art

[0002] With the development of automatic drilling technology, the supporting clamps of drilling rigs are also gradually evolving to meet the needs of automatic loading and unloading of drill rods by automatic drilling rigs. Among them, the automatic loading and unloading technology of drill rods for automated directional drilling rigs is particularly complex. It is necessary to load and unload both ordinary drilling rods and special drilling tools such as bottom hole motors. The outer diameters of various drilling tools are not the same. After the existing drilling rig clamps are assembled, they can only be used for loading and unloading of drill rods with one outer diameter. If they are needed for drill rods with other outer diameters, complex operations of removing and replacing slips must be performed. However, the existing clamp structure is relatively complex, which is not conducive to the rapid replacement of slips. Therefore, during the construction process of existing automated directional drilling rigs (including non-automated directional drilling rigs), only ordinary drill rods can be automatically loaded and unloaded. For example, the loading and unloading of special drilling tools such as bottom hole motors requires a fully manual method, that is, manual pipe clamps to tighten or loosen the connecting threads. This construction method has high labor intensity and low efficiency, and is very likely to cause safety accidents. It does not meet the construction requirements of coal mine safety, intelligence, and efficiency.

[0003] Existing drilling rig clamps are mainly of two types: top open type and pull rod connected type.

[0004] A top-open composite clamp (201010108949.5) and a new type of piston-to-top double clamp (201710280043.3) are typical representatives of top-open clamps. The slips of this type of clamp are directly connected to the clamping cylinder. Since the slips are subjected to a strong reaction force when clamping, the slips are usually very thick and large in size. In addition, the space between the cylinders on both sides is very limited, so it is very difficult to replace the slips. Generally, the clamping cylinder and the slips need to be removed as a whole. Therefore, it is very difficult to replace the slips that adapt to different specifications of drilling tools during the construction process, which takes a lot of time.

[0005] The clamp (201310577923.9) is a typical representative of the pull rod connection type. The left and right parts of the clamp are connected by a number of pull rods, and the left and right halves move symmetrically to achieve clamping or loosening. Although the slips of this clamp are small in size and can be directly taken out from the middle space of the clamp, the slip positioning of the prior art uses a top plug rod to achieve axial positioning of the slips, and a block to achieve circular rotation of the slips. However, this limiting method will cause the limiting parts to be subjected to a strong force along the axial direction of the drill pipe and the clamp during operation (the drill pipe moves back and forth), especially when the drilling rig is drilling at an inclination angle, the plug rod is often unable to be removed due to bending and deformation, making it very difficult to replace the slips. In addition, the processing of the slip seat of this clamp is very complicated and costly, and it cannot be used directly as a slip. At the same time, it is also very difficult to set two specifications of slips on the slip seat, so it is impossible to quickly adapt to changes in drilling tool specifications. Utility Model Content

[0006] The utility model aims to provide a split drill rod clamp to solve the technical problem that the existing clamp is only suitable for drilling tools with one outer diameter after assembly.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A split drill pipe clamp comprises a base and two clamping mechanisms symmetrically arranged on both sides of the base, each clamping mechanism comprises a power piece and a clamping unit, each clamping unit comprises an inner slip and an outer slip, the inner slip is detachably mounted on the inner side of the outer slip, and the outer slip is connected to the power piece.

[0009] The principle of this scheme is:

[0010] In actual application, the inner diameter of the external slip matches the larger outer diameter drill rod, and the inner diameter of the internal slip matches the smaller outer diameter drill rod. When the inner slip is severely worn or needs to be replaced from the smaller outer diameter drill rod to the larger outer diameter drill rod, it is only necessary to remove the inner slip. If the requirement is the opposite, just follow the reverse steps to reinstall the inner slip.

[0011] The advantages of this solution are:

[0012] 1. This solution is applicable to drill rods with two outer diameters. During the construction process, this solution is applied to the switching of drill rods with two outer diameters, which improves the application range of the clamp, and is especially suitable for the situation where a directional drill rig uses ordinary drill rods and special drilling tools such as bottom hole motors at the same time.

[0013] 2. When the inner slip is severely worn or the drill pipe with a smaller outer diameter needs to be replaced with a drill pipe with a larger outer diameter, the solution only needs to remove the inner slip and the drill pipe can continue to be used. The operation is convenient and fast, which is beneficial to production efficiency.

[0014] Preferably, as an improvement, the front projection of the inner cava is a cross shape, the main body in the middle section of the cross section is an arc, bosses are provided on both sides of the arc body, the main body of the outer cava facing the inner cava is an arc shape, and a plane is provided on the upper and lower parts of the arc-shaped body for cooperating with the boss of the inner cava, and a clamping block is provided at each of the four corners of the outer cava plane, and the left-right symmetrical stop planes of the four clamping blocks of the outer cava are combined with the arc-shaped body to form an inner cava installation space, and the outer diameter of the inner cava and the inner diameter of the outer cava match each other.

[0015] The arc-shaped bodies of the inner and outer slips are installed correspondingly, the boss and the plane are installed correspondingly, and the four clamping blocks of the outer slip complete the axial positioning of the inner slip by limiting the axial movement of the boss to prevent the axial movement of the inner slip during use.

[0016] Preferably, as an improvement, the inner cava is threadedly connected to the outer cava, a countersunk through hole is provided outwardly on the inward side of the inner cava, and threaded holes are provided at corresponding positions of the countersunk through holes of the outer cava and the inner cava.

[0017] The threaded connection between the inner and outer slips makes it easy to disassemble and install the inner slips. The inner slips can be replaced by simply unscrewing or screwing in the threaded parts used for connection. At the same time, the connected threaded parts can provide arc radial positioning for the inner slips. This positioning method makes good use of the advantages of high tensile strength of threaded connection, while avoiding its weak shear strength, greatly reducing the possibility of deformation of the slip positioning parts.

[0018] Preferably, as an improvement, the inner surfaces of the inner and outer slips are provided with a plurality of bumps or fine sharp teeth. The bumps and fine sharp teeth can increase the friction with the surface of the drill rod, and prevent the drill rod from slipping and losing control during use.

[0019] Preferably, as an improvement, the base comprises a front support plate, a rear support plate, an upper lining plate, and a lower lining plate, which together form an inner cava sliding guide cavity and an installation space for a power component, and the power component, outer cava, and inner cava are symmetrically installed in sequence in the installation space.

[0020] The front support plate, rear support plate, upper lining plate and lower lining plate form a space for installing external slips and power parts. The space is closed at the top and bottom and hollowed out at the left and right sides. The power parts, external slips and internal slips are installed in the hollow positions on the left and right sides from the outside to the inside. The power parts are connected to the external slips, and the external slips drive the internal slips to move, so as to clamp the drill rod and form an open space when the internal slips need to be replaced, so as to facilitate the operation of personnel.

[0021] Preferably, as an improvement, the base further comprises a power component mounting plate, which is symmetrically mounted on the outsides of the two power components. The power component mounting plate fixes the power components on the base.

[0022] Preferably, as an improvement, the base further comprises a mounting plate, which is fixedly mounted on the bottom of the base. The mounting plate fixes the clamp on the frame of the drilling rig.

[0023] Preferably, as an improvement, the base further comprises a U-shaped plate, which is fixedly mounted on the front support plate. The U-shaped plate is used to install the bushing, and also provides a passage space for the drill rod, providing a certain positioning and guiding effect for the drill rod.

[0024] Preferably, as an improvement, it further comprises a bushing, which is fixedly mounted on the U-shaped plate to provide axial guidance for the drill rod to enter or leave the clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an axial side view of an embodiment of the utility model;

[0026] Figure 2 This is a front view of an embodiment of the utility model;

[0027] Figure 3 for Figure 2 AA section view;

[0028] Figure 4 This is the axial side view of the base;

[0029] Figure 5 This is the side view of the inner slip shaft;

[0030] Figure 6 It is the side view of the outer slip shaft. DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementation methods:

[0032] The figure marks in the drawings of the specification include: clamping cylinder 1, base 2, mounting plate 201, power component mounting plate 202, lower lining plate 203, rear support plate 204, upper lining plate 205, U-shaped plate 206, front support plate 207, inner cava 3, outer cava 4, and bushing 5.

[0033] The embodiment is basically as shown in the attached Figure 1-6 As shown:

[0034] like Figure 1As shown, a split drill pipe clamp includes a base 2, a bushing 5, and two clamping mechanisms symmetrically arranged on both sides of the base 2, each clamping mechanism includes a power part and a clamping unit, the power part can be a power mechanism such as an oil cylinder or a gas cylinder. In this embodiment, the power part is a clamping cylinder, and the clamping unit includes an inner cava 3 and an outer cava 4. The inner cava 3 can be detachably installed on the inner side of the outer cava 4, and the outer cava 4 is connected to the clamping cylinder 1.

[0035] like Figure 4 As shown, the base 2 is the main bearing member of the clamp and the mounting support member of other parts. The base 2 includes a front support plate 207, a rear support plate 204, two upper lining plates 205, two lower lining plates 203, a mounting plate 201, a power component mounting plate 202, and a U-shaped plate 206. The bottom of the base 2 is a mounting plate 201, which is fixedly mounted on the drilling rig frame and is used to fix the clamp on the drilling rig frame. The left and right outer end surfaces of the base 2 are power component mounting plates 202, which are symmetrically fixedly mounted on the outside of the two clamping cylinders 1 to fix the clamping cylinders 1. The front support plate 207, the rear support plate 204, the two upper lining plates 205, and the two lower lining plates 203 enclose the installation space of the inner slip guide cavity and the clamping cylinder 1. The installation space is closed from top to bottom and hollowed out from left to right. The outer slip 4 and the inner slip 3 are symmetrically installed in the left and right hollows of the installation space from outside to inside. The front support plate 207 and the rear support plate 204 are both provided with U-shaped notches on their upper parts, and the U-shaped plate 206 is installed on the U-shaped notches of the front support plate 207 for installing the bushing 5. The front support plate 207, the rear support plate 204, the U-shaped plate 206, and the two inner slips 3 together constitute a space for the drill rod to pass through.

[0036] like Figure 2 As shown, the clamping cylinder 1 includes a cylinder barrel and a piston rod. The cylinder barrel is symmetrically installed in the installation space of the base 2. The cylinder barrel is located outside the external slip 4. The piston rod is connected to the external slip 4 by screws to realize the slip clamping drive.

[0037] like Figure 3 As shown, the outer clapboard 4 and the inner clapboard 3 are connected by screws.

[0038] like Figure 5 As shown, the front projection of the inner cava 3 is a cross shape, and the main body in the middle section of the cross section is an arc. Bosses are provided on the upper and lower sides of the arc main body, and the bosses are symmetrically distributed. The upper and lower bosses of the inner cava 3 are provided with two countersunk through holes on the side facing the center of the clamp. The screws pass through the countersunk through holes to connect the outer cava 4 for installing the screws connected to the outer cava 4. The two symmetrical inner cava 3 form a sliding guide cavity for clamping the drill rod. The inner cava 3 cooperates with the stop plane corresponding to the outer cava 4 through four symmetrical positioning surfaces on the left and right sides to realize the positioning of the inner cava 3 along the front and rear axial direction of the clamp. The inner surface of the inner cava 3 is provided with a number of bumps or fine sharp teeth to increase the friction between the inner cava 3 and the drill rod.

[0039] like Figure 6 As shown, the main body of the outer slip 4 facing the inner slip 3 is arc-shaped, and the upper and lower sides of the arc-shaped main body are provided with a plane for matching with the boss of the inner slip 3. A clamping block is provided at each of the four corners of the plane of the outer slip 4. The four symmetrical stop planes of the four clamping blocks are combined with the arc-shaped main body to form the installation space of the inner slip 3. The outer slip 4 is provided with a mounting hole on the side facing the clamping cylinder 1. The diameter and length of the mounting hole match the piston rod of the clamping cylinder 1. The boss of the outer slip 4 is provided with a countersunk through hole facing the center of the clamp. The screw passes through the countersunk through hole and is connected to the piston rod of the clamping cylinder 1. The outer slip 4 is provided with a threaded hole at the corresponding position of the countersunk through hole of the inner slip 3. The inner surface of the outer slip 4 has a number of bumps or fine sharp teeth, which further increases the friction between the outer slip 4 and the drill pipe.

[0040] The outer diameter of the inner slip 3 and the inner diameter of the outer slip 4 match each other. The inner diameter of the inner slip 3 matches the outer diameter of the smaller drill pipe, and the inner diameter of the outer slip 4 matches the outer diameter of the larger drill pipe.

[0041] like Figure 1 As shown, the bushing 5 is fixedly mounted on the U-shaped plate 206. Depending on factors such as the length of the drill rod to be clamped and the arrangement of the clamp on the frame, the bushing 5 can be installed at both ends of the base 2 or only on one side.

[0042] During specific use, when the inner slip 3 is severely worn or needs to be replaced from a smaller outer diameter drill rod to a larger outer diameter drill rod, the inner slip 3 needs to be disassembled. It is only necessary to fully retract the clamping cylinder 1. At this time, the piston rod is retracted, driving the external slip 4 connected thereto to move to both sides of the base 2. The external slip 4 drives the inner slip 3 connected thereto to move in the same direction, forming an open space for disassembling and assembling the slips. The user only needs to unscrew the screws used to connect the inner slip 3 and the external slip 4 to remove the inner slip 3. If it is necessary to replace the larger outer diameter drill rod back to the smaller outer diameter drill rod, the inner slip 3 can be reinstalled. The installation sequence is the opposite of the above steps. After assembly, this solution is suitable for drilling tools with two outer diameters. It can also be used in construction sites with complex environments. Users can quickly disassemble and replace slips as needed, which greatly reduces the workload of users.

[0043] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A split drill pipe clamp, comprising a base, and two clamping mechanisms symmetrically arranged on both sides of the base, each clamping mechanism comprising a power part and a clamping unit, characterized in that: Each clamping unit comprises an inner slip and an outer slip, wherein the inner slip is detachably mounted on the inner side of the outer slip, and the outer slip is connected to a power member.

2. The split drill pipe clamp according to claim 1, characterized in that: The front projection of the inner cava is a cross shape, and the main body in the middle section of the cross section is an arc, with bosses on both sides of the arc body. The main body of the outer cava is an arc on the side facing the inner cava, and a flat surface is provided on the upper and lower sides of the arc-shaped body for cooperating with the boss of the inner cava. A clamping block is provided at each of the four corners of the outer cava plane, and the left and right stop planes of the four clamping blocks of the outer cava are combined with the arc-shaped body to form an inner cava installation space, and the outer diameter of the inner cava and the inner diameter of the outer cava match each other.

3. The split drill pipe clamp according to claim 2, characterized in that: The inner slip is threadedly connected with the outer slip, a countersunk through hole is arranged outwardly on the inner side of the inner slip, and threaded holes are arranged at corresponding positions of the countersunk through holes of the outer slip and the inner slip.

4. The split drill pipe clamp according to claim 3, characterized in that: The inner surfaces of the inner slips and the outer slips are both provided with a plurality of protrusions or small sharp teeth.

5. The split drill pipe clamp according to claim 1, characterized in that: The base includes a front support plate, a rear support plate, an upper lining plate, and a lower lining plate. The front support plate, the rear support plate, the upper lining plate, and the lower lining plate together form an inner cava sliding guide cavity and an installation space for a power component. The power component, the outer cava, and the inner cava are symmetrically installed in sequence in the installation space.

6. The split drill pipe clamp according to claim 5, characterized in that: The base also includes a power component mounting plate, and the power component mounting plate is symmetrically mounted on the outsides of the two power components.

7. The split drill pipe clamp according to claim 6, characterized in that: The base also includes a mounting plate, and the mounting plate is fixedly mounted on the bottom of the base.

8. The split drill pipe clamp according to claim 7, characterized in that: The base also includes a U-shaped plate, and the U-shaped plate is fixedly mounted on the front supporting plate.

9. The split drill pipe clamp according to claim 8, characterized in that: The invention also comprises a bushing which is fixedly mounted on the U-shaped plate.

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