A make-up device for an iron roughneck

Abstract

The utility model relates to a kind of screwing device of iron drill, including support, screwing wheel, transmission chain, screwing drive mechanism and chain adjusting mechanism;Screwing wheel is rotatably installed in support, screwing drive mechanism is slidably installed in support, screwing drive mechanism is connected screwing wheel by transmission chain, to drive screwing wheel circumferential rotation;Chain adjusting mechanism is installed in support, and located below screwing drive mechanism;Chain adjusting mechanism connects screwing drive mechanism, to drive screwing drive mechanism to slide away or approach screwing wheel, and then adjust the tension of transmission chain.Its beneficial effect is, the mechanization adjustment of chain length is realized by chain adjusting mechanism, not only solve the problem of personnel work intensity big, time-consuming long in traditional manual adjustment mode, also promote the adaptation efficiency and transmission stability to different specifications drill pipe, more can satisfy the working condition demand of efficient, safe, low maintenance in petroleum and natural gas drilling operation.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas drilling technology, and in particular to a rotary locking device for iron drillers. Background Technology

[0002] In oil and gas drilling operations, the iron drill is a core piece of automated spin-locking equipment. Its spin-locking device is responsible for the coupling and uncoupling of drill pipes, directly affecting drilling efficiency and operational safety. Because different specifications of drill pipes need to be adapted during the drilling process, the chain drive structure of the spin-locking device needs to adjust the chain length to achieve clamping of drill pipes of different diameters, ensuring stable torque transmission during coupling.

[0003] Currently, traditional chain-type rotary coupling devices mostly use manual adjustment handwheels to adjust the chain length. Operators must turn the handwheel within the confined space of the equipment, using a screw or tie rod structure to change the position of the drive mechanism and thus adjust the chain tension. However, drilling site equipment layouts are compact, and the adjustment space is limited. Furthermore, the lever arm of the manual adjustment handwheel is relatively short, requiring significant force to complete the adjustment. This not only results in high workload but also often takes 5-10 minutes per wheel adjustment, severely impacting the continuity of drilling operations.

[0004] Therefore, there is an urgent need for a high-efficiency rotary joint device for drillers to meet the requirements of quick and convenient adjustment of drill rods of different specifications. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a screw fastening device for iron drillers, which solves the technical problem that the prior art is unable to meet the requirements of efficient drilling conditions.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] This utility model provides a screw fastening device for a steel drill, including a bracket, a screw fastening wheel, a transmission chain, a screw fastening drive mechanism, and a chain adjustment mechanism. The screw fastening wheel is rotatably mounted on the bracket, and the screw fastening drive mechanism is slidably mounted on the bracket. The screw fastening drive mechanism is connected to the screw fastening wheel via the transmission chain to drive the screw fastening wheel to rotate circumferentially. The chain adjustment mechanism is mounted on the bracket and located below the screw fastening drive mechanism. The chain adjustment mechanism is connected to the screw fastening drive mechanism to drive the screw fastening drive mechanism to slide away from or towards the screw fastening wheel, thereby adjusting the tension of the transmission chain.

[0010] Optionally, the chain adjustment mechanism includes a movable seat, an adjusting screw, and a drive assembly; one end of the adjusting screw is rotatably mounted on the bracket, and the other end of the adjusting screw is mounted on the bracket via the drive assembly; the movable seat is mounted on the adjusting screw; a rotary drive mechanism is connected to the movable seat, and the drive assembly can drive the adjusting screw to rotate, and the rotation of the adjusting screw causes the movable seat and the rotary drive mechanism to move along the axial direction of the adjusting screw.

[0011] Optionally, the chain adjustment mechanism also includes a lead screw floating seat; the drive assembly is fixedly connected to the lead screw floating seat, the lead screw floating seat is disposed in the mounting port on the bracket, and the lead screw floating seat can achieve radial floating in the mounting port.

[0012] Optionally, the mounting opening is square; the overall shape of the lead screw floating seat is cylindrical, with four mounting slots evenly arranged along its circumference on its outer side; the four sides of the mounting opening are located in the four mounting slots of the lead screw floating seat in a one-to-one correspondence.

[0013] Optionally, the mounting opening includes a main body and a crossbeam; the crossbeam is installed at the bottom of the main body, and the two together form a square mounting opening.

[0014] Optionally, the drive assembly includes a connecting seat and a driver; the driver is fixedly connected to the connecting seat and the lead screw floating seat, and the drive shaft of the driver is connected to the other end of the adjusting lead screw.

[0015] Optionally, an adjusting nut is provided at the other end of the adjusting screw.

[0016] Optionally, the adjusting screw is a trapezoidal screw.

[0017] Optionally, a scale is provided on the bracket; the scale extends along the sliding direction of the rotary buckle drive mechanism.

[0018] (III) Beneficial Effects

[0019] The beneficial effects of this utility model are:

[0020] This utility model provides a chain adjustment device for drillers. The chain adjustment mechanism directly drives the rotary drive mechanism to slide, changing the chain length. This eliminates the need for manual adjustment of the handwheel, overcoming the difficulty of applying force due to limited space and small lever arm in traditional methods. It significantly reduces the physical exertion of operators, making the adjustment process more convenient and efficient. For drill pipes of different diameters, the chain adjustment mechanism can quickly drive the rotary drive mechanism to slide, achieving precise adjustment of the chain length and ensuring the chain's grip on the drill pipe. The adjustment time per wheel is significantly reduced, minimizing drilling downtime caused by adjustment and improving operational efficiency. The chain adjustment mechanism is located below the rotary drive mechanism, forming a compact layout with the support, rotary wheel, and other components. It requires minimal additional space, adapting to environments with dense drilling equipment and limited operating space, ensuring stable execution of adjustment actions even in confined spaces. Compared to existing technologies, this rotary buckle device achieves mechanized adjustment of chain length through a chain adjustment mechanism. This not only solves the problems of high labor intensity and long time consumption in traditional manual adjustment methods, but also improves the adaptability and transmission stability of drill pipes of different specifications, and better meets the requirements of high efficiency, safety and low maintenance in oil and gas drilling operations. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the screw fastening device for a steel driller in Embodiment 1 of this utility model;

[0022] Figure 2 This is a schematic diagram of the chain adjustment mechanism in Embodiment 1 of this utility model;

[0023] Figure 3 This is a schematic diagram of the chain adjustment mechanism from another angle in Embodiment 1 of this utility model;

[0024] Figure 4 This is an exploded view of the chain adjustment mechanism in Embodiment 1 of this utility model;

[0025] Figure 5 This is a cross-sectional view of the chain adjustment mechanism in Embodiment 1 of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the lead screw floating seat in Embodiment 1 of this utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the lead screw floating seat set in the mounting port in Embodiment 1 of this utility model.

[0028] [Explanation of Labels in the Attached Image]

[0029] 1: Bracket; 11: Main body; 12: Crossbeam; 13: Scale; 2: Rotary wheel; 3: Transmission chain; 4: Rotary drive mechanism; 51: Moving seat; 52: Adjusting screw; 53: Floating screw seat; 54: Mounting slot; 55: Connecting seat; 56: Driver; 57: Adjusting nut. Detailed Implementation

[0030] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0031] Example 1:

[0032] like Figure 1 As shown, this embodiment provides a screw fastening device for a steel drill, including a bracket 1, a screw fastening wheel 2, a transmission chain 3, a screw fastening drive mechanism 4, and a chain adjustment mechanism. The screw fastening wheel 2 is rotatably mounted on the bracket 1, and the screw fastening drive mechanism 4 is slidably mounted on the bracket 1. The screw fastening drive mechanism 4 is connected to the screw fastening wheel 2 through the transmission chain 3 to drive the screw fastening wheel 2 to rotate circumferentially. The chain adjustment mechanism is mounted on the bracket 1 and located below the screw fastening drive mechanism 4. The chain adjustment mechanism is connected to the screw fastening drive mechanism 4 to drive the screw fastening drive mechanism 4 to slide away from or towards the screw fastening wheel 2, thereby adjusting the tension of the transmission chain 3.

[0033] Specifically, the chain adjustment mechanism directly drives the rotary drive mechanism 4 to slide, changing the chain length without the need for manual adjustment of the handwheel. This eliminates the difficulty of applying force due to limited space and small lever arm in traditional methods, significantly reducing the physical exertion of operators and making the adjustment process more convenient and efficient. For drill pipes of different diameters, the chain adjustment mechanism can quickly drive the rotary drive mechanism 4 to slide, achieving precise adjustment of the chain length and ensuring the chain's gripping effect on the drill pipe. The adjustment time per wheel is significantly shortened, reducing drilling downtime caused by adjustment and improving operational efficiency. The chain adjustment mechanism is located below the rotary drive mechanism 4, forming a compact layout with the support 1, rotary wheel 2, and other components. It does not require excessive additional space, adapting to working environments with dense drilling equipment and limited operating space, ensuring stable execution of adjustment actions even in confined spaces. Compared to existing technologies, this rotary buckle device achieves mechanized adjustment of chain length through a chain adjustment mechanism. This not only solves the problems of high labor intensity and long time consumption in traditional manual adjustment methods, but also improves the adaptability and transmission stability of drill pipes of different specifications, and better meets the requirements of high efficiency, safety and low maintenance in oil and gas drilling operations.

[0034] Furthermore, such as Figures 2-5 As shown, the chain adjustment mechanism includes a movable seat 51, an adjusting screw 52, ​​and a drive assembly. One end of the adjusting screw 52 is rotatably mounted on the bracket 1, and the other end of the adjusting screw 52 is mounted on the bracket 1 via the drive assembly. The movable seat 51 is mounted on the adjusting screw 52. The rotary drive mechanism 4 is connected to the movable seat 51. The drive assembly can drive the adjusting screw 52 to rotate, and the rotation of the adjusting screw 52 causes the movable seat 51 and the rotary drive mechanism 4 to move along the axial direction of the adjusting screw 52. Through the threaded engagement between the screw and the movable seat 51, the rotational motion of the drive assembly is converted into the linear motion of the rotary drive mechanism 4. Utilizing the fixed pitch characteristic of the screw drive, the moving distance of the rotary drive mechanism 4 can be precisely controlled to meet the chain tension and position adjustment needs of drillers when rotary locking (such as rotary locking adaptation for different specifications of drill tools). Both ends of the adjusting screw 52 are mounted on the bracket 1, forming a stable support structure. Combined with the power input of the drive assembly, this ensures that the rotary drive mechanism 4 experiences uniform force during movement, preventing wobbling or jamming and improving the stability of the rotary operation. In this embodiment, the adjusting screw 52 is a trapezoidal screw. During the rotary operation of the iron drill, the rotary drive mechanism 4 needs to apply force via a chain. When the drive assembly stops outputting power, the self-locking characteristic of the trapezoidal screw utilizes the sliding friction between the threads to prevent the moving seat 51 from driving the adjusting screw 52 to rotate in the reverse direction due to the chain tension (i.e., the nut cannot drive the screw to reverse), ensuring that the rotary drive mechanism 4 remains stably stationary at the target position. During operation, if the rotary drive mechanism 4 needs to maintain a certain position for a long time (such as continuously tightening the chain while waiting for the drill bit to align), the self-locking of the trapezoidal screw can replace the continuous power output of the drive assembly (no need for motor stalling or hydraulic system pressure holding). This reduces energy consumption and prevents the drive assembly from overheating and being damaged due to prolonged high-load operation, improving system reliability.

[0035] Furthermore, such as Figures 2-5As shown, the chain adjustment mechanism also includes a lead screw floating seat 53; the drive assembly is fixedly connected to the lead screw floating seat 53, which is located in the mounting port on the bracket 1, and the lead screw floating seat 53 can achieve radial floating in the mounting port. The lead screw floating seat 53 makes the connection between the drive assembly and the bracket 1 radially floating, allowing one end of the adjusting lead screw 52 to make a slight radial offset within the mounting port (perpendicular to the lead screw axis), thereby compensating for the coaxiality error of the two ends or the positional deviation caused by the deformation of the bracket 1; it eliminates the radial additional force generated by the "forced centering" of the lead screw, so that the lead screw only bears the axial load (the force of the drive moving seat 51), avoiding the increase in torque caused by additional friction on the threaded mating surface, allowing the drive assembly to drive the lead screw to rotate more effortlessly; at the same time, the reduced additional torque can reduce the power loss of the drive assembly, avoid failures such as motor burnout and gear breakage caused by overload, and extend the service life of the transmission system. In this embodiment, the adjusting screw 52 needs to be mounted on the bracket 1 at both ends to ensure transmission stability. However, vibrations and deformation of the bracket 1 under drilling conditions can easily cause coaxiality deviation at both ends of the screw, potentially leading to jamming or wear. The screw floating seat 53 allows one end of the adjusting screw 52 to float radially, automatically compensating for this deviation and ensuring that the screw only bears axial load (without additional radial force). The trapezoidal screw, with its large bearing area and self-locking characteristics, ensures that the transmission does not slip and the position does not shift during the floating process. The combined action of the screw floating seat 53 and the trapezoidal screw eliminates the risk of jamming in rigid connections while maintaining the stability of the screw transmission, ensuring that the adjustment process remains stable and efficient even under complex working conditions.

[0036] Furthermore, such as Figure 6 and Figure 7As shown, the mounting opening is square; the overall shape of the lead screw floating seat 53 is cylindrical, with four mounting grooves 54 evenly arranged circumferentially on its outer side; the four sides of the mounting opening are located one-to-one within the four mounting grooves 54 of the lead screw floating seat 53. The four sides of the square mounting opening cooperate with the four mounting grooves 54 of the floating seat, which can effectively limit the circumferential rotation of the lead screw floating seat 53, prevent the floating seat from moving when the drive assembly drives the lead screw to rotate, and ensure that all driving force is used for the rotation of the lead screw; at the same time, the gap between the mounting grooves 54 and the sides of the mounting opening provides a stable radial floating space for the floating seat, ensuring that the floating direction is controllable. The cooperation between the cylindrical floating seat and the square mounting opening does not require a complex guide structure, the processing difficulty is low, and the even distribution of the four mounting grooves 54 can balance the force on the floating seat, avoid unilateral wear, and extend the service life. In this embodiment, the lead screw floating seat 53 needs to float radially to compensate for deviation, but circumferential rotation must be avoided (otherwise it will consume driving force). The four sides of the square mounting opening mate with the four mounting slots 54 of the floating seat, forming a guide that constrains the circumferential direction and allows the radial direction. The gap between the mounting slots 54 and the sides of the mounting opening provides space for floating, while the corresponding engagement of the four sides restricts the rotation of the lead screw floating seat 53 with the adjusting lead screw 52. This coordination ensures the effective operation of the floating function (compensating for deviations), ensures that all driving force is used for the rotation of the adjusting lead screw 52 (without energy loss), and simplifies the guide structure.

[0037] Furthermore, such as Figure 7 As shown, the mounting port includes a main body 11 and a crossbeam 12; the crossbeam 12 is installed at the bottom of the main body 11, and the two together form a square mounting port. The crossbeam 12 is detachable, allowing the lead screw floating seat 53 to be placed into the main body 11 first during assembly, and then the crossbeam 12 to complete the square mounting port enclosure, simplifying the installation process of the lead screw floating seat 53; at the same time, the crossbeam 12 is installed at the bottom of the main body 11, forming a square structure with the main body 11, which not only ensures the overall strength of the mounting port, but also provides a stable support boundary for the floating seat, avoiding deformation of the mounting port after long-term use that affects the floating effect, thus balancing assembly convenience and structural reliability; during later maintenance, the lead screw floating seat 53 can be removed by disassembling the crossbeam 12, improving maintenance efficiency.

[0038] Furthermore, such as Figures 2-5As shown, the drive assembly includes a connecting seat 55 and a driver 56. The driver 56 is fixedly connected to the lead screw floating seat 53 via the connecting seat 55, and the drive shaft of the driver 56 is connected to the other end of the adjusting lead screw 52. The connecting seat 55, as an intermediate connector, adapts to the installation dimensions of the driver 56 and the lead screw floating seat 53, ensuring that the power of the driver 56 is stably transmitted to the adjusting lead screw 52 via the drive shaft, reducing power loss. Simultaneously, the connecting seat 55 provides rigid support for the driver 56, preventing the connection between the driver 56 and the lead screw from loosening due to vibration, ensuring the driver 56 can operate efficiently for a long time, and providing a stable power source for the adjustment of the transmission chain 3. In this embodiment, the driver 56 is a servo motor.

[0039] Furthermore, such as Figure 1 As shown, a scale 13 is provided on the bracket 1; the scale 13 extends along the sliding direction of the rotary drive mechanism 4. The fixed pitch characteristic of the adjusting screw 52 ensures that the movement distance of the rotary drive mechanism 4 is quantifiable, and the scale 13 visualizes this quantification result. The operator can directly read the real-time position of the rotary drive mechanism 4 through the scale 13, which facilitates quick judgment of whether the adjustment is in place (such as the preset position for a specific drill bit), eliminating the need for repeated trial and error and significantly improving work efficiency. When adjusting multiple times or by different operators, the same position parameters can be recorded and reproduced through the scale 13, ensuring the consistency of adjustment of the rotary device under different working conditions and reducing work errors caused by position deviations (such as unstable drill bit rotary torque).

[0040] The rotary threading device for drilling rigs provided in this embodiment is used as follows: When it is necessary to change to drill rods of different specifications, the operator starts the servo motor to drive the adjusting screw 52 to rotate. The moving seat 51 slides along the screw axis, thereby pushing the rotary threading drive mechanism 4 away from or away from the rotary threading wheel 2. The length of the transmission chain 3 is adjusted accordingly to match the drill rod of the corresponding diameter. During the process, the operator observes the movement distance of the rotary threading drive mechanism 4 through the scale 13 on the bracket 1. When it reaches the preset scale corresponding to the drill rod, the adjustment stops. The self-locking characteristic of the trapezoidal screw keeps the rotary threading drive mechanism 4 stably stationary, ensuring that the chain grips the drill rod with appropriate force. During the rotary threading operation, when the torque reaction force of the drill rod causes a slight deformation of the bracket 1, the screw floating seat 53 floats radially within the square mounting opening, automatically compensating for the coaxiality deviation at both ends of the adjusting screw 52, ​​ensuring smooth screw transmission without jamming or additional wear. The entire adjustment process does not require personnel to enter a confined space to apply force, and the adjustment time per wheel is reduced, significantly improving the continuity and stability of drilling operations.

[0041] Example 2:

[0042] This embodiment provides a screw fastening device for a steel driller, which includes all the structures of the screw fastening device described in Embodiment 1.

[0043] In this embodiment, an adjusting nut 57 is provided at the other end of the adjusting screw 52. The drive assembly realizes the mechanized adjustment of the chain length, while the adjusting nut 57 serves as a backup manual adjustment structure. The two work together to form a dual guarantee of mechanical as the primary method and manual as the secondary method; under normal operating conditions, the drive assembly adjusts quickly; when the drive assembly fails (such as a power outage), adjustment can still be completed through the adjusting nut 57, avoiding interruption of drilling operations. This dual-mode design not only meets the demand for high efficiency but also improves the fault tolerance of the equipment, adapting to the stringent requirements of continuous and uninterrupted operation at the drilling site.

[0044] Example 3:

[0045] This embodiment provides a metal drill, including the screw fastening device described in Embodiment 1.

[0046] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0048] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A screw fastening device for a steel driller, characterized in that, It includes a bracket (1), a rotary wheel (2), a transmission chain (3), a rotary drive mechanism (4), and a chain adjustment mechanism; The rotating wheel (2) is rotatably mounted on the bracket (1), and the rotating drive mechanism (4) is slidably mounted on the bracket (1). The rotating drive mechanism (4) is connected to the rotating wheel (2) through the transmission chain (3) to drive the rotating wheel (2) to rotate circumferentially. The chain adjustment mechanism is installed on the bracket (1) and located below the screw drive mechanism (4); the chain adjustment mechanism is connected to the screw drive mechanism (4) to drive the screw drive mechanism (4) to slide away from or near the screw wheel (2), thereby adjusting the tension of the transmission chain (3).

2. The screw fastening device for a steel driller as described in claim 1, characterized in that, The chain adjustment mechanism includes a moving base (51), an adjusting screw (52), and a drive assembly; One end of the adjusting screw (52) is rotatably mounted on the bracket (1), and the other end of the adjusting screw (52) is mounted on the bracket (1) via a drive assembly. The movable seat (51) is mounted on the adjusting screw (52). The rotary drive mechanism (4) is connected to the movable seat (51). The drive assembly can drive the adjusting screw (52) to rotate. The rotation of the adjusting screw (52) causes the movable seat (51) and the rotary drive mechanism (4) to move along the axial direction of the adjusting screw (52).

3. The screw fastening device for a steel driller as described in claim 2, characterized in that, The chain adjustment mechanism also includes a lead screw floating seat (53); The drive assembly is fixedly connected to the lead screw floating seat (53), which is located in the mounting port on the bracket (1) and can float radially in the mounting port.

4. The screw fastening device for a steel driller as described in claim 3, characterized in that, The mounting port is square in shape; The overall shape of the lead screw floating seat (53) is cylindrical, and its outer side has four mounting slots (54) evenly arranged along its circumference; The four sides of the mounting port are located in the four mounting slots (54) of the lead screw floating seat (53) in a one-to-one correspondence.

5. The screw fastening device for a steel driller as described in claim 4, characterized in that, The mounting port includes a main body (11) and a crossbeam (12); The crossbeam (12) is installed at the bottom of the main body (11), and the two together form a square mounting opening.

6. The screw fastening device for a steel driller as described in claim 2, characterized in that, The drive assembly includes a connector (55) and a driver (56); The driver (56) is fixedly connected to the connecting seat (55) and the lead screw floating seat (53), and the drive shaft of the driver (56) is connected to the other end of the adjusting lead screw (52).

7. The screw fastening device for a steel driller as described in claim 2, characterized in that, An adjusting nut (57) is provided at the other end of the adjusting screw (52).

8. The screw fastening device for a steel driller as described in claim 2, characterized in that, The adjusting screw (52) is a trapezoidal screw.

9. The screw fastening device for a steel driller as described in claim 1, characterized in that, A scale (13) is provided on the bracket (1); The scale (13) extends along the sliding direction of the rotary buckle drive mechanism (4).

Images