Orifice clamping device

Abstract

The invention discloses an orifice clamp holder, which relates to the field of geological drilling and comprises a mounting frame fixed on a drilling machine platform, a first electric clamp holder and a second electric clamp holder, the first electric clamp holder and the second electric clamp holder are mounted in the mounting frame, the first electric clamp holder is used for clamping a drilling tool, and the second electric clamp holder is used for clamping a sleeve. The first electric clamp holder and the second electric clamp holder are integrated in the mounting frame, so that synchronous and cooperative clamping of a drilling tool and a casing pipe in deep drilling operation is realized. Meanwhile, the clamp holder adopts an electric driving mode, the dependence of a traditional hydraulic or pneumatic clamp holder on a medium environment is avoided, the clamp holder can adapt to the extreme working conditions of low gravity and vacuum of the moon, the technical blank of an orifice clamp holder in the field of deep drilling of the moon is successfully filled, and a key technical support is provided for localization and engineering application of moon drilling equipment.

Description

Technical Field

[0001] This invention relates to the field of geological drilling, and in particular to a borehole clamp. Background Technology

[0002] Current technologies for collecting lunar soil typically involve sampling from the lunar surface. To explore the deeper mysteries of the moon, deep lunar drilling is required. Due to the loose, unconsolidated, and fine-grained structure of lunar soil, casing is needed during deep drilling to prevent the drilled hole from collapsing. A wellhead clamp holds the lower casing, while a power head holds the upper casing and rotates it, tightening the two casings together with threads. If a bottom-hole power drill is used, the wellhead clamp needs to hold the casing throughout the drilling process to provide reaction force.

[0003] Because the lunar environment is a special environment of low gravity and vacuum, the advantages of gravity clamping in existing technologies are no longer obvious. At the same time, the vacuum environment makes it impossible to use pneumatic and hydraulic drives for the orifice clamp. There is no orifice clamp that meets the requirements in the existing technology. Summary of the Invention

[0004] The purpose of this invention is to provide an orifice holder to solve the problems existing in the prior art, so that the orifice holder can be used in the special environment on the moon, and is both motor driven and simple, reliable in structure and lightweight.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a borehole clamp, comprising: a mounting frame for fixing on a drilling rig platform, a first electric clamp and a second electric clamp installed in the mounting frame, wherein the first electric clamp is used to clamp the drill bit, and the second electric clamp is used to clamp the casing.

[0006] As one embodiment, both the first and second electric clamps include a clamp and an electric telescopic mechanism. The clamp includes an active clamping block and a driven clamping block. The active clamping block has active hinge rods hinged to both ends, and the driven clamping block has driven hinge rods hinged to both ends. The driven hinge rods and the active hinge rods are hinged together by a hinge shaft. A clamping opening is formed between the facing surfaces of the active clamping block and the driven clamping block. The mounting frame is provided with a sliding groove for the hinge shaft to slide. The extension direction of the sliding groove is perpendicular to the opening and closing direction of the clamping opening. The fixed end of the electric telescopic mechanism is fixed in the mounting frame, and the telescopic end is connected to the active clamping block. The telescopic end extends and retracts along the opening and closing direction.

[0007] As one embodiment, the above-mentioned electric telescopic mechanism includes a drive motor and a screw transmission mechanism. The threaded rod of the screw transmission mechanism is coaxially connected to the motor shaft of the drive motor, and the nut of the screw transmission mechanism is connected to the active clamping block.

[0008] As one embodiment, the above-mentioned screw drive mechanism includes a trapezoidal screw or a ball screw.

[0009] In one embodiment, the mounting bracket includes a first substrate, a second substrate, and a third substrate. The first electric clamp is fixedly installed between the first substrate and the second substrate, and the second electric clamp is fixedly installed between the second substrate and the third substrate. The first substrate has a first through hole corresponding to the clamping jaw of the first electric clamp, the second substrate has a second through hole corresponding to the clamping jaw of the second electric clamp, and the second substrate has a third through hole corresponding to the clamping jaw of the second electric clamp.

[0010] As one embodiment, the first mounting groove for mounting the drive motor of the first electric clamp is provided on the facing surfaces of the first substrate and the second substrate; a second mounting groove is provided between the second substrate and the third substrate; the first mounting groove and the second mounting groove are staggered.

[0011] As one embodiment, the diameter of the first through hole is larger than the diameter of the second through hole.

[0012] In one embodiment, the first substrate, the second substrate, and the third substrate are connected together by threaded posts and screws.

[0013] As one embodiment, the opposing surfaces of the above-mentioned active clamping block and driven clamping block are provided with anti-slip textures.

[0014] As one embodiment, the first substrate, the second substrate, and the third substrate are rectangular in shape.

[0015] This invention discloses a borehole clamp, which integrates a first electric clamp and a second electric clamp within a mounting frame to achieve synchronous and coordinated clamping of the drill string and casing during deep drilling operations. During operation, the casing provides stable anti-torque support to the drill string through its clamped state, effectively counteracting torsional disturbances during drilling and significantly improving drilling efficiency and operational stability. Simultaneously, the clamp's electric drive avoids the dependence on the medium environment of traditional hydraulic or pneumatic clamps, enabling it to adapt to the extreme conditions of low gravity and vacuum on the moon. This successfully fills the technological gap in borehole clamps for deep lunar drilling and provides key technical support for the localization and engineering application of lunar drilling equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the orifice clamp in one or more embodiments of the present invention; Figure 2 for Figure 1 A schematic diagram of the right side of the orifice holder; Figure 3 for Figure 1 A top view of the orifice clamp; Figure 4 This is a schematic diagram of the structure of the first electric gripper in one or more embodiments of the present invention; Figure 5 This is a top view schematic diagram of the second electric clamp in one or more embodiments of the present invention.

[0018] The components include: 1. Mounting bracket; 2. First electric clamp; 3. Second electric clamp; 4. Clamp; 5. Electric telescopic mechanism; 6. Active clamping block; 7. Driven clamping block; 8. Active hinge rod; 9. Driven hinge rod; 10. Hinge shaft; 11. Slide groove; 12. Drive motor; 13. Screw transmission mechanism; 14. First substrate layer; 15. Second substrate layer; 16. Third substrate layer; 17. First through hole; 18. Second through hole; 19. Third through hole; 20. First mounting groove; 21. Second mounting groove; 22. Anti-slip texture. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide an orifice holder to solve the problems existing in the prior art. The orifice holder can be used in the special environment of the moon (or other similar extraterrestrial bodies), and it is both motor driven and has a simple, reliable structure and is lightweight.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 5 As shown, this embodiment discloses a borehole clamp, which includes a mounting frame 1. In order to ensure that the mounting frame 1 does not rotate with the drill bit, the mounting frame 1 needs to be fixedly installed on the drilling platform. The internal structure and shape of the mounting frame 1 can be freely selected according to actual needs. The mounting frame 1 is provided with a first electric clamp 2 and a second electric clamp 3. The first electric clamp 2 is used to clamp the drill bit, and the second electric clamp 3 is used to clamp the casing.

[0023] During deep drilling on the moon, according to Newton's third law (for every action, there is an equal and opposite reaction), lunar regolith exerts a reaction force (i.e., counter-torque) on the drill bit that is equal in magnitude and opposite in direction. Without an external counterforce to balance this counter-torque, it will cause the drill bit to rotate in the opposite direction, leading to problems such as the drill bit failing to effectively break rocks, loosening or even disengaging the drill pipe threads, and failing to maintain the intended borehole direction during directional drilling. Therefore, an external structure must provide a counterforce opposite to the counter-torque to counteract the drill bit's reversal tendency, ensuring that all the drill bit's rotational energy is used to break rocks. Thus, different grippers are needed to hold the drill bit and casing during deep drilling.

[0024] In one embodiment, the first clamp and the second clamp adopt the same structural principle. Both include a mounting frame 1, clamps 4, and an electric telescopic mechanism 5. The clamp 4 includes an active clamping block 6 and a driven clamping block 7. The two ends of the active clamping block 6 are hinged with active hinge rods 8, and the two ends of the driven clamping block 7 are hinged with driven hinge rods 9. The number of active clamping blocks 6 and driven clamping blocks 7 can be freely selected according to actual needs. All active clamping blocks 6 are connected together through active hinge rods 8 to form the active clamp of the clamp 4, and all driven clamping blocks 7 are connected together through driven hinge rods 9 to form the driven clamp of the clamp 4. The active clamp and the driven clamp are symmetrically distributed in a two-lobed clamping structure, and their opposing inner sidewalls enclose a clamping opening for clamping the workpiece. The mounting frame 1 has an opening along the... The sliding groove 11 extends in the guide direction, and the two ends of the hinge shaft 10 slide in cooperation with the sliding groove 11. The extension direction of the sliding groove 11 is perpendicular to the opening and closing direction of the clamping port. The sliding groove 11 guides and limits the hinge shaft 10, so as to realize the smooth opening and closing of the active clamping block 6 and the driven clamping block 7. The fixed end of the electric telescopic mechanism 5 is fixedly connected to the mounting frame 1, and its telescopic end is fixedly connected to the outer wall of the active clamping block 6 away from the clamping port. The telescopic direction of the electric telescopic mechanism 5 is collinear with the opening and closing direction of the clamping port. During operation, the telescopic end of the electric telescopic mechanism 5 extends and retracts linearly along the opening and closing direction, driving the active clamping block 6 to move back and forth along this direction. Through the hinge shaft 10, the driven clamping block 7 moves synchronously towards or away from each other, thereby realizing the closing clamping or opening and releasing action of the clamping port.

[0025] Because the cost of transporting the moon is extremely high, every gram increase in the weight of the drilling equipment means a huge increase in the budget. Furthermore, all the equipment must be able to fit into the fairing at the top of the rocket. This space is fixed and extremely precious, with strict limitations on its shape and volume. At the same time, the equipment is ultimately delivered to the lunar surface by the lander, and the lander's carrying platform area, load-bearing capacity, and center of gravity distribution all have strict upper limits. Therefore, the motor-driven telescopic mechanism was refined to ensure a reduction in weight and size.

[0026] As one embodiment, the motor-driven telescopic mechanism includes a drive motor 12 and a screw transmission mechanism 13. The threaded rod of the screw transmission mechanism 13 is coaxially connected to the motor shaft of the drive motor 12, and the nut of the screw transmission mechanism 13 is connected to the active clamping block 6. The screw transmission mechanism 13 converts the rotational motion of the drive motor 12 into linear motion. The specific form of the screw transmission mechanism 13 can be selected according to actual needs. If more precise control of the feed of the screw transmission mechanism 13 is required, a ball screw can be used. However, ball screws are expensive and cannot form a self-locking mechanism. If cost control is desired while achieving self-locking of the screw transmission mechanism 13, a trapezoidal screw can be used. However, trapezoidal screws have low transmission efficiency and cannot achieve precise feed control. Therefore, the selection of the screw transmission mechanism 13 needs to be determined based on actual needs.

[0027] As one implementation, to reduce the overall space and weight, the mounting frame 1 is refined, including a first substrate 14, a second substrate 15, and a third substrate 16. A first electric clamp 2 is fixedly installed between the first substrate 14 and the second substrate 15, and a second electric clamp 3 is fixedly installed between the second substrate and the third substrate 16. The fixing method can be freely selected according to actual needs, ensuring that the first electric clamp 2 and the second electric clamp 3 do not loosen as the drill bit rotates; for example... Figure 2 and 3 As shown, a first through hole 17 is provided on the first substrate 14, which is coaxially corresponding to the clamping jaw of the first electric clamp 2. A second through hole 18 and a third through hole 19 are provided on the second substrate 15 and the third substrate 16, respectively, which are coaxially corresponding to the clamping jaw of the second electric clamp 3. The drill bit and the casing can be inserted through the above-mentioned through holes along the axial direction. The first electric clamp 2 and the second electric clamp 3 correspond to the axial projection positions of the first through hole 17, the second through hole 18 and the third through hole 19, respectively, to achieve coaxial clamping and positioning of the drill bit or casing. The diameter of the first through hole 17 is larger than the diameter of the second through hole 18 and the third through hole 19. This diameter design allows the power head gripper to pass through the first through hole 17 and extend into the clamping area of ​​the first electric clamp 2, thereby gripping the casing clamped and positioned by the second electric clamp 3, thus meeting the casing handover operation requirements between the power head and the second electric clamp 3.

[0028] As one implementation method, to achieve a lightweight and compact design of the overall mechanism and optimize space utilization to save launch costs, the first substrate 14 and the second substrate 15 are arranged in an up-and-down stack facing each other, and a first mounting groove 20 is correspondingly formed on the mating surface (i.e., facing surface) of the two substrates. The first mounting groove 20 is formed by recessing inward along the thickness direction of the substrate, and the shape and size of its cavity are precisely matched with the outline of the drive motor 12 of the first electric gripper 2. A transition fit or small clearance fit design is adopted to ensure that the drive motor 12 can be firmly mounted in the groove and is easy to disassemble and maintain. At the same time, the inner wall of the mounting groove is provided with positioning pin holes and threaded fixing holes. Through the synergistic action of the positioning pins and fastening bolts, the drive motor 12 is positioned in both the circumferential and axial directions in the groove, preventing the motor from shifting or loosening due to vibration during operation.

[0029] The second substrate 15 and the third substrate 16 also adopt a laminated assembly structure. A second mounting groove 21 is provided between the facing surfaces of the two substrates. The design logic of the second mounting groove 21 is consistent with that of the first mounting groove 20. Its groove parameters match the shape of the drive motor 12 of the second electric gripper 3. It also has positioning and fixing functions, and can completely or partially embed the drive motor 12 of the second electric gripper 3 into the groove, reducing the additional installation space required for external motor mounting.

[0030] As one implementation, to avoid excessive local thickness of the substrate due to the vertical overlap of multiple mounting slots, and to balance the stress distribution of the substrate and improve the overall structural strength, the first mounting slot 20 and the second mounting slot 21 are staggered along the horizontal projection plane of the substrate. Specifically, the projection areas of the two slots in the substrate plane are non-overlapping, and the offset of their central axis in the horizontal direction is greater than 1 / 2 of the maximum radial dimension of the drive motor 12, ensuring that the upper and lower drive motors 12 will not interfere with each other after mounting. At the same time, the staggered arrangement disperses the load of the slots inside the substrate, avoiding the substrate structure from being weak due to excessive local slotting. Thus, while reducing the overall weight, it ensures the stability of the substrate's support for the clamp and its resistance to deformation.

[0031] This design, which combines embedded and staggered arrangement, eliminates the need for a separate mounting bracket required for traditional external motors by embedding the drive motor 12 inside the base plate. This not only significantly reduces the vertical height and horizontal footprint of the mechanism but also lowers the overall weight by reducing redundant structural components. At the same time, the integrated embedded design of the drive motor 12 and the base plate shortens the force transmission path between the motor and the gripper actuator, improving the response speed and transmission efficiency of the gripping action. It effectively avoids the assembly loosening problem caused by vibration of external motors and provides structural protection for the stable gripping of drill bits and casings.

[0032] The connection method between substrates can be freely selected according to actual needs. Simple structure, small footprint, and light weight are preferred. Based on this principle, a detachable connection structure combining threaded posts and screws is recommended. The specific connection method is as follows: Several cylindrical threaded posts are arranged vertically in specific areas or at preset stress-balanced distribution points on the first substrate 14, second substrate 15, and third substrate 16. The axis of the threaded posts is consistent with the thickness direction of the substrate, and their length is precisely matched according to the total assembly thickness of the first substrate 14, second substrate 15, and third substrate 16; The lower end of the threaded post is fastened to the threaded hole on the lower substrate (e.g., when the second substrate 15 and the third substrate 16 are connected, the lower end of the threaded post is connected to the third substrate 16) through the external thread. The upper end passes through the positioning hole of the second substrate (e.g., when the first substrate and the second substrate 15 are connected, it passes through the second substrate 15) and is aligned with the threaded hole of the first substrate 14. Finally, the threaded post is screwed down from the upper surface of the first substrate 14 through an internal hexagonal head screw or a cross-head countersunk screw to form a locking fit with the internal thread of the threaded post, thereby achieving axial compression and fixation of the first substrate 14, the second substrate 15, and the third substrate 16.

[0033] This connection method not only fully meets the priority requirements of "simple structure, small space occupation, and light weight", but also has the following technical advantages: the combination structure of threaded column and screw does not require complex connecting brackets or transition parts, and the space occupied by the connection point is only the radial dimension of the threaded column, which effectively reduces the space occupied by the connection structure on the internal space of the mechanism; by reasonably designing the number and distribution of threaded columns and the specifications of screws, it can be ensured that the connection structure has sufficient load-bearing capacity to resist the radial reaction force and vibration load generated during the clamping operation, ensuring the overall rigidity and stability of the three-layer substrate after connection, avoiding relative displacement or loosening between the substrates, and providing reliable structural support for the precise coaxial cooperation of the clamp.

[0034] As one implementation method, in order to adapt to the reliable clamping requirements of drill tools and casing under complex working conditions such as drilling operations, and to cope with the axial tensile force, radial vibration and torque load that the drill tools or casing may bear during the operation, and to avoid the workpiece slipping relative to the clamp 4 due to insufficient friction on the clamping surface, based on this, an anti-slip texture 22 structure is integrally formed or inlaid on the effective clamping area (i.e. the opposing working surfaces of the two clamping blocks) of the active clamping block 6 and the driven clamping block 7 of the clamp 4. At the same time, in order to improve the design flexibility to adapt to different working conditions (such as differences in surface roughness of drill tools or casing, changes in working load level, etc.), other types of anti-slip reinforcement devices can be selected or added according to the specific needs of the actual application scenario to form a multi-layer anti-slip protection mechanism.

[0035] Specifically, the design of the anti-slip texture 22 structure needs to take into account both the improvement of the friction coefficient and the fit of the clamping surface: high-efficiency anti-slip texture 22 such as diamond cross pattern, sawtooth pattern or spiral pattern should be given priority. The texture is evenly distributed along the circumference of the clamping surface so that the anti-slip texture 22 can form a mechanical interlocking effect with the surface of the drill bit or casing when clamping, thereby increasing the friction coefficient by increasing the normal pressure and shear resistance at the contact point.

[0036] The aforementioned anti-slip design effectively increases the static friction coefficient of the clamping surface of clamp 4, effectively counteracting the slippage tendency of the drill string or casing during operation. It also takes into account the requirements of clamping reliability and workpiece surface protection, significantly improving the clamping stability of clamp 4 and providing strong support for the precise positioning and safe and efficient operation of drilling.

[0037] As one implementation method, in order to adapt to the extreme environment of lunar drilling operations and the standardized installation requirements of the drilling platform, and to ensure the stability, reliability and ease of assembly of the connection between the base plate assembly and the lunar drilling platform, the first base plate 14, the second base plate 15 and the third base plate 16 all adopt a regular rectangular structure design. The rectangular shape design is not simply based on shape simplification, but fully combines the core design principles of the present invention and the installation interface layout characteristics of the lunar drilling platform. It is the optimal solution determined after multi-dimensional working condition adaptation analysis.

[0038] In terms of installation compatibility, the mounting area of ​​the lunar drilling rig platform usually adopts a standardized rectangular mounting reference surface, and the outline of the rectangular base plate can be fully fitted with the platform mounting surface.

[0039] From the perspective of structural mechanics, under the premise of the same amount of material and substrate thickness, the rectangular shape has better bending stiffness and torsional strength than irregular structures such as circles and polygons. Its cross-sectional moment of inertia is larger, which can effectively transfer and disperse the radial load generated when the clamp 4 holds the drill or casing, avoid the substrate from warping or deforming due to excessive local stress, ensure the coaxiality accuracy of the through holes on each layer of substrate and the clamp, and provide structural support for the stable insertion and precise clamping of the drill or casing.

[0040] From the perspective of manufacturing and assembly efficiency, the processing technology of rectangular substrates meets the standardized production requirements of aerospace equipment. The shape contour and hole positions can be integrated through high-precision processing methods such as CNC milling and wire cutting. At the same time, the upper and lower surfaces of the rectangular shape are regular planes, which result in a higher degree of fit when stacked, effectively reducing the gap between layers, further improving the overall rigidity of the substrate assembly, and avoiding relative shaking between layers during vibration.

[0041] From the perspective of space utilization, the space available for the lunar drilling rig platform is extremely limited. The rectangular base plate shape makes it easy to plan the distribution of internal mounting slots, through holes and other structures, avoiding spatial interference with other components and maximizing the use of the platform's space.

[0042] In summary, the rectangular shape of the three-layer substrate not only achieves efficient adaptation and stable fixation with the lunar drilling platform, but also takes into account the requirements of structural strength, processing and assembly, and space utilization. It provides a reliable structural foundation for the clamping and positioning of drill bits or casings in lunar drilling operations and meets the operational stability requirements of the extreme lunar environment.

[0043] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A hole holder, characterized in that, include: A mounting bracket (1) for fixing on a drilling platform, a first electric clamp (2) and a second electric clamp (3) installed in the mounting bracket (1), the first electric clamp (2) for clamping the drill bit, and the second electric clamp (3) for clamping the casing.

2. The orifice clamp according to claim 1, characterized in that, Both the first electric clamp (2) and the second electric clamp (3) include a clamp (4) and an electric telescopic mechanism (5). The clamp (4) includes an active clamping block (6) and a driven clamping block (7). The active clamping block (6) is hinged to both ends with an active hinge rod (8), and the driven clamping block (7) is hinged to both ends with a driven hinge rod (9). The driven hinge rod (9) and the active hinge rod (8) are hinged together by a hinge shaft (10). A clamping opening is formed between the facing surfaces of the active clamping block (6) and the driven clamping block (7). The mounting frame (1) is provided with a sliding groove (11) for the hinge shaft (10) to slide. The extension direction of the sliding groove (11) is perpendicular to the opening and closing direction of the clamping opening. The fixed end of the electric telescopic mechanism (5) is fixed in the mounting frame (1), and the telescopic end is connected to the active clamping block (6). The telescopic end extends and retracts along the opening and closing direction.

3. The orifice clamp according to claim 2, characterized in that, The electric telescopic mechanism (5) includes a drive motor (12) and a screw transmission mechanism (13). The threaded rod of the screw transmission mechanism (13) is coaxially connected to the motor shaft of the drive motor (12), and the nut of the screw transmission mechanism (13) is connected to the active clamping block (7).

4. The orifice holder according to claim 3, characterized in that, The screw drive mechanism (13) includes a trapezoidal screw or a ball screw.

5. The orifice clamp according to claim 1, characterized in that, The mounting bracket includes a first substrate (14), a second substrate (15), and a third substrate (16). The first electric clamp (2) is fixedly installed between the first substrate (14) and the second substrate (15), and the second electric clamp (3) is fixedly installed between the second substrate (15) and the third substrate (16). The first substrate (14) has a first through hole (17) corresponding to the clamping jaw of the first electric clamp (2), the second substrate (15) has a second through hole (18) corresponding to the clamping jaw of the second electric clamp (3), and the second substrate (15) has a third through hole (19) corresponding to the clamping jaw of the second electric clamp (3).

6. The orifice clamp according to claim 5, characterized in that, The first substrate (14) and the second substrate (15) are respectively provided with a first mounting groove (20) for mounting the drive motor (12) of the first electric clamp (2); a second mounting groove (21) is provided between the second substrate (15) and the third substrate (16); the first mounting groove (20) and the second mounting groove (21) are staggered.

7. The orifice holder according to claim 5 or 6, characterized in that, The diameter of the first through hole (17) is larger than the diameter of the second through hole (18).

8. The orifice holder according to claim 5 or 6, characterized in that, The first substrate (14), the second substrate (15), and the third substrate (16) are connected together by threaded posts and screws.

9. The orifice holder according to any one of claims 2-6, characterized in that, Both the active clamping block and the driven clamping block have anti-slip textures (22) on their opposing surfaces.

10. The orifice holder according to claim 5 or 6, characterized in that, The first substrate (14), the second substrate (15) and the third substrate (16) are rectangular in shape.

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