A drill pipe clamping device and hydraulic drilling rig

Abstract

The present application belongs to the field of hydraulic drilling machine, and discloses a drill rod clamping device and a hydraulic drilling machine, which comprises a clamp base, a drill rod conveying device, a lifting oil cylinder and a clamp lifting body; the clamp base is fixedly connected to the drill rod conveying device; the lifting oil cylinder is arranged in the interior of the clamp base; the clamp lifting body is arranged above the clamp base, and left and right clamping bodies are arranged on the two sides of the clamp lifting body; a jaw set is arranged on each of the left and right clamping bodies, and the jaw set is used for clamping drill rods with different diameters; the jaw set comprises upper jaws and first lower jaws, one side of the upper jaw is provided with an upper jaw stop bar, and one side of the first lower jaw is provided with a limiting plate. The present application solves the centering problem in the drill rod clamping process by arranging the clamp lifting body, and improves the clamping efficiency of the drill rod clamping; by arranging replaceable different jaw sets, the clamping range of the drill rod clamping is larger, and it is more suitable for clamping drill rods with different diameters.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic drilling rig machinery, and particularly relates to a drill rod clamping device and a hydraulic drilling rig. Background Technology

[0002] For a long time, drill pipe clamping devices have been widely used in the field of hydraulic drilling rigs. They are an indispensable device for clamping and fixing drill pipes and for unscrewing them. Especially in automatic rod loading systems, clamping devices are essential components.

[0003] However, research has revealed the following problems with the clamping devices in existing upper rod mechanisms during actual operation and construction:

[0004] 1. Existing drill pipe clamping devices have a limited clamping range. One type of clamping device can only clamp drill pipes or drill collars of one diameter. When drilling operations are carried out using drill pipes or drill collars of different diameters, technical problems of poor adaptability will occur, which will seriously affect drilling efficiency and restrict the application and development of automatic rod loading technology.

[0005] 2. Drill pipe clamping devices are usually used in conjunction with drill pipe conveying devices. Studies have shown that for the clamping device to work better with the drill pipe conveying device, it must have a certain height adjustment function to achieve the centering effect with the drill pipe conveying device.

[0006] 3. In actual construction operations, the jaw structure in the drill pipe clamping device is mainly used to clamp the drill pipe. Due to frequent contact and friction with the outer diameter of the drill pipe, the jaw wear is quite severe. The existing clamping device does not have a structure for replacing the jaws. When the jaw teeth on the surface are worn, they cannot be replaced, and when used to clamp the drill pipe again, the clamping will not be firm enough. Summary of the Invention

[0007] In view of this, embodiments of the present invention provide a drill pipe clamping device and a hydraulic drilling rig that can adapt to the clamping requirements of different pipe diameters; the drill pipe clamping device has a height adjustment function and a jaw replacement structure, and when used in conjunction with a drill pipe conveying device, it can achieve better centering effect and replace excessively worn jaws; thus improving the working efficiency of automatic rod loading and unloading.

[0008] The technical solution provided by this invention is as follows:

[0009] A drill pipe clamping device includes a clamp base, a drill pipe conveying device, a lifting cylinder, and a clamp lifting body. The clamp base is fixedly connected to the drill pipe conveying device. The lifting cylinder is disposed inside the clamp base. The cylinder head end of the lifting cylinder is connected to the clamp lifting body via an upper connecting shaft. The cylinder tail end of the lifting cylinder is connected to the clamp base via a lower connecting shaft. A clamp lifting body is disposed above the clamp base, and a left clamping body and a right clamping body are symmetrically disposed on both sides of the clamp lifting body. Both the left and right clamping bodies are provided with jaw assemblies, which are used to clamp drill pipes of different diameters. Each jaw assembly includes an upper jaw and a first lower jaw. An upper jaw stop bar is disposed on one side of the upper jaw, and a limit plate is disposed on one side of the first lower jaw.

[0010] Furthermore, the upper part of the left clamping body and the right clamping body is welded with an upper jaw seat. The upper jaw seat has a non-through arc groove for placing the upper jaw. The upper jaw stop bar fixes one end of the upper jaw to one end of the upper jaw seat through a jaw bolt, an upper jaw spring washer and an upper jaw flat washer.

[0011] Furthermore, both the left and right clamping bodies are provided with a front clamping body plate, a rear clamping body plate, and a connecting rib plate. The front clamping body plate, the rear clamping body plate, the connecting rib plate, and the upper jaw seat are fixed by welding. The left and right clamping bodies and the clamp lifting body are rotatably connected by the first clamping body connecting shaft.

[0012] Furthermore, the left and right clamping bodies are connected to clamping cylinders; the clamping cylinders are connected to the clamping lifting body via a lower connecting shaft; the clamping lifting body is movably connected to the left and right clamping bodies via a first clamping body connecting shaft; the clamping cylinders are movably connected to the left and right clamping bodies via a second clamping body connecting shaft; the first and second clamping body connecting shafts are milled with grooves, and a clamping plate is provided in the grooves.

[0013] Furthermore, both the upper connecting shaft and the lower connecting shaft of the lifting cylinder are milled with grooves, and a clamping plate is provided in the groove. The clamping plate is fixed to the outside of the clamp base by the lifting cylinder spring washer and the lifting cylinder bolt.

[0014] Furthermore, the clamp lifting body includes a clamp lifting body front plate and a clamp lifting body rear plate. The upper part of the clamp lifting body front plate and the clamp lifting body rear plate is a dovetail-shaped slot, which is fixed to the dovetail-shaped support by welding. The upper part of the clamp lifting body front plate and the clamp lifting body rear plate has through holes.

[0015] Furthermore, the dovetail support is provided with a first lower jaw, a second lower jaw, a second left lower jaw seat and a second right lower jaw seat. A second lower jaw stop is provided on one side of the second lower jaw. The second lower jaw stop is fixedly connected to one end of the second left lower jaw seat and the second right lower jaw seat by a jaw stop bolt, a second lower jaw spring washer and a second lower jaw flat washer.

[0016] Furthermore, the clamp base is provided with T-shaped sliding plates and connecting plates on both sides, and the clamp lifting body is movably connected to the clamp base through the T-shaped sliding plates; the connecting plates are connected to the clamp base by welding; an adjusting shim is provided between the T-shaped sliding plates and the clamp base to adjust the distance between the T-shaped sliding plates and the connecting plates.

[0017] Furthermore, the upper part of the drill pipe conveying device is a V-shaped groove for supporting and transporting the drill pipe to a predetermined position; a connecting square plate is provided at the front end of the drill pipe conveying device, and the back plate of the clamp base and the connecting square plate are fixedly connected by drill pipe conveying device bolts, drill pipe conveying device spring washers, drill pipe conveying device flat washers and drill pipe conveying device nuts.

[0018] The present invention also provides a hydraulic drilling rig, including the drill rod clamping device described above.

[0019] Beneficial effects

[0020] The drill pipe clamping device of the present invention, by configuring multiple sets of replaceable jaws, can increase the clamping range of the drill pipe and make it more adaptable to clamping different pipe diameters. During the clamping process, it can adapt to the clamping requirements of different pipe diameters and achieve the effect of clamping drill pipes and drill collars of different diameters with the fewest parts replacements.

[0021] By setting up the lifting cylinder and the clamp lifting body, the drill pipe clamping device of the present invention has a certain height adjustment function. When used in conjunction with the drill pipe conveying device, it can achieve a better centering effect and improve the clamping efficiency of the drill pipe.

[0022] This invention, through the design of structures such as stop bars and limit plates, enables convenient replacement of excessively worn clamp teeth, thereby improving the working efficiency of automatic up and down levers. Attached Figure Description

[0023] The invention will be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0024] Figure 1 This is a schematic diagram of the drill pipe clamping device according to an embodiment of the present invention;

[0025] Figure 2 This is an exploded structural diagram of the drill pipe clamping device according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic cross-sectional view of the lifting cylinder of the drill pipe clamping device according to an embodiment of the present invention;

[0027] Figure 4 and Figure 5 This is a schematic diagram of an assembly in which the drill pipe clamping device and the drill pipe conveying device are used in conjunction according to an embodiment of the present invention;

[0028] Figure 6 , Figure 7 , Figure 8 and Figure 9 These are illustrations showing the effect of using standard and optional jaws to clamp drill pipes of different diameters using the drill pipe clamping device according to an embodiment of the present invention.

[0029] Figure 10 and Figure 11 This is a partially enlarged view of the replaceable upper and lower jaws of the drill pipe clamping device according to an embodiment of the present invention.

[0030] In the diagram: 1—clamp base; 2—clamp lifting body; 3—clamping cylinder; 4—limiting plate; 5—clamping jaw bolt; 6—left clamping body; 7—clamping jaw stop bolt; 8—upper clamping jaw stop; 9—upper clamping jaw; 10—second lower left clamping jaw seat; 11—second lower clamping jaw; 12—second lower clamping jaw stop; 13—upper connecting shaft of lifting cylinder; 14—lifting cylinder spring washer; 15—drill pipe conveying device flat washer; 16—lifting cylinder; 17—lifting cylinder bolt; 18—right clamping body; 19—T-shaped sliding plate; 20—lower connecting shaft of lifting cylinder; 21—clamping 22—Lower connecting shaft of hydraulic cylinder; 23—First clamping body connecting shaft; 24—Bolt of drill pipe conveying device; 25—Nut of drill pipe conveying device; 26—Second lower right jaw seat; 27—Adjusting shim; 28—First lower jaw; 29—Clamping plate; 30—Spring washer of drill pipe conveying device; 31—Flat washer of second lower jaw; 32—Spring washer of second lower jaw; 80—Drill pipe conveying device; 88—Drill pipe with a diameter of 260mm; 89—Drill pipe with a diameter of 110mm; 90—Drill pipe with a diameter of 73mm; 91—Drill pipe with a diameter of 89mm.

[0031] It should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Furthermore, the same or similar reference numerals denote the same or similar components. Detailed Implementation

[0032] Various exemplary embodiments of the invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the invention or its application or use. The invention can be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0033] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, without excluding the possibility of encompassing other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] In this invention, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0035] All terms used in this invention (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0037] Example 1

[0038] like Figures 1 to 11As shown, a drill pipe clamping device includes a clamp base 1, a drill pipe conveying device 80, a lifting cylinder 16, and a clamp lifting body 2. The clamp base 1 is fixedly connected to the drill pipe conveying device 80. The clamp lifting body 2 is movably connected to the clamp base 1 via a T-shaped sliding plate 19. Two clamping bodies are symmetrically arranged on both sides of the clamp lifting body 2. The clamping bodies are provided with jaw assemblies, which are used to clamp drill pipes of different diameters. The jaw assemblies are symmetrically arranged on the left and right sides of the clamp lifting body, and their maximum height does not contact the inner wall of the clamping body.

[0039] The clamp base 1 includes two T-shaped slide plates 19, which are symmetrically arranged on both sides of the clamp base 1. The two T-shaped slide plates 19 are connected to the clamp base 1 by countersunk bolts. An adjusting shim 27 is disposed between the T-shaped slide plates 19 and the clamp base 1. The adjusting shim 27 has two through holes. The clamp base 1 includes a clamp base front plate and a clamp base rear plate.

[0040] The clamp base 1 is provided with connecting plates on the left and right sides. The connecting plates are symmetrically arranged on the left and right sides. The two connecting plates are connected to the clamp base 1 by welding. In order to connect with the T-shaped slide plate 19, two threaded holes are opened on the connecting plates. The T-shaped slide plate 19 is provided with countersunk through holes. The adjusting shim 27, the connecting plates and the T-shaped slide plate 19 are fixedly connected by countersunk bolts. The purpose of the adjusting shim 27 is to adjust the distance between the T-shaped slide plate 19 and the left and right connecting plates of the clamp base 1.

[0041] The upper part of the drill pipe conveying device 80 has a V-shaped groove for supporting and transporting the drill pipe to a predetermined position. A connecting square plate is provided at the front end of the drill pipe conveying device 80. The back plate of the clamp base 1 is assembled to the connecting square plate of the drill pipe conveying device 80 and is fixedly connected by drill pipe conveying device bolts 24, drill pipe conveying device spring washers 30, drill pipe conveying device flat washers 15, and drill pipe conveying device nuts 25. The drill pipe conveying device bolts 24 are hexagonal head bolts with holes in the head.

[0042] The lifting cylinder 16 is disposed inside the clamp base 1, and the tail end of the lifting cylinder 16 is connected to the clamp base 1 via the lower connecting shaft 20 of the lifting cylinder.

[0043] To prevent the lower connecting shaft 20 of the lifting cylinder from rotating, a groove is milled at one end of the lower connecting shaft 20. A clamping plate 29 is placed in the groove, and the clamping plate 29 is fixed to the outside of the rear plate of the clamp base by the lifting cylinder spring washer 14 and the lifting cylinder bolt 17. The lifting cylinder bolt 17 is a hexagonal head bolt.

[0044] A clamp lifting body 2 is provided above the clamp base 1, and the guard plate of the T-shaped slide plate 19 is fixed inside the clamp lifting body 2 by welding.

[0045] The clamp lifting body 2 includes a clamp lifting body front plate and a clamp lifting body rear plate. The upper part of the clamp lifting body front plate and the clamp lifting body rear plate is a dovetail-shaped slot, which is fixed to the dovetail-shaped support by welding. The upper part of the clamp lifting body front plate and the clamp lifting body rear plate has a through hole. The cylinder head end of the lifting cylinder 16 is connected to the clamp lifting body 2 through the upper connecting shaft 13 of the lifting cylinder.

[0046] Similarly, in order to prevent the connecting shaft 13 on the lifting cylinder from rotating, a groove is milled at one end of the connecting shaft 13 on the lifting cylinder, and the clamping plate 29 is placed in the groove. The clamping plate 29 is fixed to the outside of the front plate of the clamp lifting body 2 by the lifting cylinder spring washer 14 and the lifting cylinder bolt 17.

[0047] When the piston rod of the lifting cylinder 16 extends, the clamp lifting body 2 will move upward, achieving alignment with the drill pipe conveying device 80.

[0048] The dovetail-shaped support is provided with a first lower jaw 28, a second lower jaw 11, a second left lower jaw seat 10, and a second right lower jaw seat 26; the outer edge shape of the first lower jaw 28, the second left lower jaw seat 10, and the second right lower jaw seat 26 is dovetail-shaped, which is compatible with the concave shape of the dovetail-shaped support, and a fit is formed by a small clearance insertion and extraction method.

[0049] The dovetail support has symmetrical threaded holes on the left and right sides and front and back. A limiting plate 4 is provided on the dovetail support, and the limiting plate 4 is bolted to the dovetail support. When different ranges of drill rod need to be clamped, the limiting plates 4 on both sides of the dovetail support can be removed to replace the first lower jaw 28, the second lower left jaw seat 10, and the second lower right jaw seat 26. The limiting plate 4 is fixedly connected to the threaded holes by a support spring washer and jaw bolts 5, used to limit the front and back displacement of the first lower jaw 28, the second lower left jaw seat 10, or the second lower right jaw seat 26, preventing them from moving out of the dovetail support. The jaw bolts 5 are hexagonal head bolts with holes in the head.

[0050] The second lower left jaw holder 10 and the second lower right jaw holder 26 have non-through arc grooves for placing the second lower jaw 11. Threaded holes are opened at one end of the second lower left jaw holder 10 and the second lower right jaw holder 26. The second lower left jaw holder 10 and the second lower right jaw holder 26 are placed into the non-through arc grooves. Considering the need to limit the displacement of the other end of the second lower jaw 11, three threaded holes are opened at one end of the second lower left jaw holder 10 and the second lower right jaw holder 26. A second lower jaw stop bar 12 is provided on one side of the second lower jaw 11. The second lower jaw stop bar 12 is connected to the second lower left jaw holder 10 and the second lower right jaw holder 26 by bolts, which can limit the movement of the second lower jaw 11. The second lower jaw stop bar 12 is fixedly connected to two threaded holes at one end of the second left lower jaw seat 10 by jaw bolt 5 and second lower jaw spring washer 32; the second lower jaw stop bar 12 is used to fix one end of the second lower jaw 11 to prevent the second lower jaw 11 from being displaced out of the second left lower jaw seat 10 and the second right lower jaw seat 26.

[0051] To limit excessive rotation of the second lower jaw 11 within the arc grooves of the second lower left jaw seat 10 and the second lower right jaw seat 26, an arc groove is milled at one end of the second lower jaw 11. The jaw stop bolt 7 presses the second lower jaw flat washer 31 onto the arc groove at the outer end of the second lower jaw 11, thus limiting the rotation of the second lower jaw 11. In addition, when clamping the drill pipe, a small rotation of the second lower jaw 11 allows for a larger clamping contact area between the second lower jaw 11 and the drill pipe, resulting in a better clamping effect.

[0052] The first lower jaw 28 is used to clamp all drill rods within the range of 260mm diameter drill rod 88 and 110mm diameter drill rod 89. The second lower left jaw seat 10, the second lower right jaw seat 26, and the second lower jaw 11 are used to clamp all drill rods within the range of 73mm diameter drill rod 90 and 89mm diameter drill rod 91.

[0053] When the second lower jaw 11 is severely worn and needs to be replaced, the second lower jaw stop strip 12 can be removed for replacement; when the first lower jaw 28 is severely worn and needs to be replaced, the limit plate 4 can be removed for replacement; the setting of the second lower jaw stop strip 12 and the limit plate 4 achieves the purpose of convenient replacement of vulnerable parts;

[0054] The clamp lifting body 2 is provided with a left clamping body 6 and a right clamping body 18 on both sides; the left clamping body 6 and the right clamping body 18 are symmetrically arranged, and each of the left clamping body 6 and the right clamping body 18 is provided with a clamping body front plate, a clamping body rear plate and a connecting rib plate. The clamping body front plate, clamping body rear plate, connecting rib plate and upper jaw seat are fixed by welding; the left clamping body 6, the right clamping body 18 and the clamp lifting body 2 are rotatably connected by the first clamping body connecting shaft 22;

[0055] The upper parts of the left clamping body 6 and the right clamping body 18 are welded with upper jaw seats. The upper jaw seats have non-through arc grooves for placing upper jaw teeth 9 and limiting the displacement of one end of the upper jaw teeth. The upper jaw teeth 9 protrude from one end of the upper jaw seat. Considering the need to limit the displacement of the other end of the upper jaw teeth 9, three threaded holes are opened at one end of the upper jaw seat. When the upper jaw teeth 9 are placed in the non-through arc groove, an upper jaw tooth stop bar 8 is provided on one side of the upper jaw teeth 9. The upper jaw tooth stop bar 8 fixes one end of the upper jaw teeth 9 to the two threaded holes at one end of the upper jaw seat through jaw teeth bolts 5, upper jaw teeth spring washers, and upper jaw teeth flat washers to prevent the upper jaw teeth 9 from moving out of the upper jaw seat. When the upper jaw teeth are worn and need to be replaced, the jaw teeth bolts 5 can be removed for replacement. The jaw teeth bolts 5 are bolts with holes in the head.

[0056] To limit excessive rotation of the upper jaw 9 within the arc groove of the upper jaw seat, an arc groove is milled at one end of the upper jaw 9. A jaw stop bolt 7 presses a flat washer against the arc groove at the outer end of the upper jaw 9, thus limiting its rotation. Furthermore, when clamping the drill pipe, a small amount of rotation of the upper jaw 9 allows for a larger clamping contact area between the upper jaw 9 and the drill pipe, resulting in a better clamping effect. The jaw stop bolt 7 is an internal hex head bolt.

[0057] The left clamping body 6 and the right clamping body 18 are connected to clamping cylinders 3; the clamping cylinders 3 are arranged symmetrically on the left and right sides, and the clamp lifting body 2 is movably connected to the left clamping body 6 and the right clamping body 18 through a first clamping body connecting shaft 22; the clamping cylinders 3 are movably connected to the left clamping body 6 and the right clamping body 18 through a second clamping body connecting shaft 23; similarly, in order to prevent the first clamping body connecting shaft 22 and the second clamping body connecting shaft 23 from rotating, a groove is milled on one section of the first clamping body connecting shaft 22 and the second clamping body connecting shaft 23, and a clamping plate 29 is placed in the groove. The clamping plate 29 is fixed to the outside of the front plate of the left clamping body 6, the right clamping body 18 and the clamp lifting body 2 through clamping body spring washers and clamping body bolts; the clamping cylinders 3 and the clamp lifting body 2 are connected through a clamping cylinder lower connecting shaft 21.

[0058] When the piston rod of the clamping cylinder 3 extends, the left clamping body 6 and the right clamping body 18 will retract, thereby clamping the drill pipe or drill collar.

[0059] Existing drill pipe clamping devices suffer from drawbacks during construction, including difficulties in replacing easily damaged jaw components, poor alignment when used with drill pipe conveying devices, and an inability to clamp drill pipes and drill collars of different diameters. These issues hinder the overall efficiency of drill pipe loading. As a key component in drill pipe loading and unloading, the drill pipe clamping device plays a crucial role and is often used in conjunction with the drill pipe conveying device. The ability of the clamping device to rise and fall to the predetermined position on the drill pipe conveying device, thereby successfully clamping the drill pipe, is a critical consideration in the design of the drill pipe clamping device.

[0060] The jaws of the drill pipe clamping device are the main force-bearing components that apply clamping force to the drill pipe. They are in constant contact with the outer wall of the drill pipe or drill collar and are subject to significant wear, making them vulnerable parts. Whether this component can be modularized and replaced in a timely manner is a major factor affecting the clamping effect. Furthermore, the ability to replace modular vulnerable parts is an important measure to reduce the cycle cost of the drill pipe clamping device.

[0061] In actual construction operations, drill pipes and drill collars of different diameters are often used. Whether the effect of clamping drill pipes and drill collars of different diameters can be achieved with the fewest parts can be of great significance for improving oil drilling and production efficiency and shortening the time cycle of drill pipe loading and unloading.

[0062] According to an embodiment of the present invention, by designing a simple and easy-to-maintain telescopic drill mast structure, the problems of difficulty in replacing easily damaged parts of the drill mast during construction, as well as low construction efficiency due to uneven fit between the inner and outer sections of the drill mast, are solved, effectively improving the construction efficiency of the drill mast and the whole machine.

[0063] In response to the working environment and conditions of drill pipe conveying in oil drilling rigs, this application employs a drill pipe clamping device. Utilizing different types of lower jaw seat structures, the lower jaws are raised to accommodate drill pipes of varying diameters, such as 73mm to 89mm. This type of drill pipe clamping device features height adjustment and a jaw replacement mechanism. The height adjustment is achieved through a lifting cylinder. The device is connected to the drill pipe conveying device. When not in use, the device can be grounded for increased safety. When in use, the lifting cylinder raises the device to align with the drill pipe conveying V-groove for clamping. When used in conjunction with the drill pipe conveying device, it provides better alignment and allows for the replacement of excessively worn jaws, improving the efficiency of automatic drill pipe loading and unloading.

[0064] The various embodiments of the present invention have now been described in detail. To avoid obscuring the concept of the invention, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions of this invention based on the above description.

[0065] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A drill pipe clamping device, characterized in that, The device includes a clamp base, a drill pipe conveying device, a lifting cylinder, and a clamp lifting body. The clamp base is fixedly connected to the drill pipe conveying device. The lifting cylinder is located inside the clamp base. The head end of the lifting cylinder is connected to the clamp lifting body via an upper connecting shaft. The tail end of the lifting cylinder is connected to the clamp base via a lower connecting shaft. The clamp lifting body is located above the clamp base, and a left clamping body and a right clamping body are symmetrically arranged on both sides of the clamp lifting body. Both the left and right clamping bodies are equipped with jaw assemblies for clamping drill pipes of different diameters. Each jaw assembly includes an upper jaw and a first lower jaw. An upper jaw stop bar is provided on one side of the upper jaw, and a limit plate is provided on one side of the first lower jaw.

2. The drill pipe clamping device according to claim 1, characterized in that, The upper part of the left clamping body and the right clamping body is welded with an upper jaw seat. The upper jaw seat has a non-through arc groove for placing the upper jaw. The upper jaw stop bar fixes one end of the upper jaw to one end of the upper jaw seat through jaw bolts, upper jaw spring washers and upper jaw flat washers.

3. The drill pipe clamping device according to claim 2, characterized in that, Both the left and right clamping bodies are provided with a front clamping body plate, a rear clamping body plate, and a connecting rib plate. The front clamping body plate, the rear clamping body plate, the connecting rib plate, and the upper jaw seat are fixed by welding. The left and right clamping bodies and the clamp lifting body are rotatably connected by the first clamping body connecting shaft.

4. The drill pipe clamping device according to claim 1, characterized in that, The left and right clamping bodies are connected to clamping cylinders; the clamping cylinders are connected to the clamping lifting body via a lower connecting shaft; the clamping lifting body is movably connected to the left and right clamping bodies via a first clamping body connecting shaft; the clamping cylinders are movably connected to the left and right clamping bodies via a second clamping body connecting shaft; the first and second clamping body connecting shafts are milled with grooves, and a clamping plate is provided in the grooves.

5. The drill pipe clamping device according to claim 1, characterized in that, Both the upper connecting shaft and the lower connecting shaft of the lifting cylinder are milled with grooves at one end, and a clamping plate is provided in the groove. The clamping plate is fixed to the outside of the clamp base by the lifting cylinder spring washer and the lifting cylinder bolt.

6. The drill pipe clamping device according to claim 1, characterized in that, The clamp lifting body includes a front plate and a rear plate. The upper part of the front plate and the rear plate is a dovetail-shaped slot, which is fixed to the dovetail support by welding. The upper part of the front plate and the rear plate is provided with a through hole.

7. The drill pipe clamping device according to claim 6, characterized in that, The dovetail-shaped support is provided with a first lower jaw, a second lower jaw, a second left lower jaw seat and a second right lower jaw seat. A second lower jaw stop is provided on one side of the second lower jaw. The second lower jaw stop is fixedly connected to one end of the second left lower jaw seat and the second right lower jaw seat by a jaw stop bolt, a second lower jaw spring washer and a second lower jaw flat washer.

8. The drill pipe clamping device according to claim 1, characterized in that, The clamp base is provided with T-shaped sliding plates and connecting plates on both sides. The clamp lifting body is movably connected to the clamp base through the T-shaped sliding plates. The connecting plates are connected to the clamp base by welding. Adjusting shims are provided between the T-shaped sliding plates and the clamp base to adjust the distance between the T-shaped sliding plates and the connecting plates.

9. The drill pipe clamping device according to claim 1, characterized in that, The upper part of the drill pipe conveying device is a V-shaped groove for supporting and transporting the drill pipe to a predetermined position; the front end of the drill pipe conveying device is provided with a connecting square plate, and the back plate of the clamp base and the connecting square plate are fixedly connected by drill pipe conveying device bolts, drill pipe conveying device spring washers, drill pipe conveying device flat washers and drill pipe conveying device nuts.

10. A hydraulic drilling rig, characterized in that, Includes the drill pipe clamping device as described in any one of claims 1 to 9.

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