Pin shaft mounting device, power head assembly and drilling machine

Abstract

The embodiment of the invention provides a pin shaft mounting device, a power head assembly and a drilling machine, and relates to the technical field of engineering machinery. The pin shaft mounting device comprises a driving part used for being connected with a sliding frame of the drilling machine, and at least one moving shaft is arranged on each of the two opposite sides of the driving part; and each moving shaft is connected with the corresponding pin shaft, and the driving part is used for driving the moving shafts to move at the same time so that the pin shafts can be moved into or out of shaft sleeves on a left connecting plate and a right connecting plate of the power head assembly at the same time. According to the pin shaft mounting device, the power head assembly and the drilling machine, the pin shaft is convenient to mount and dismount, so that the replacement efficiency of the power head assembly is improved.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, and in particular to a pin mounting device, a power head assembly, and a drilling rig. Background Technology

[0002] Rotary drilling rigs are engineering machines suitable for hole-forming operations in building foundation engineering. They can adapt to various soil strata such as clay, sand, and gravel, and are widely used in pile foundation construction in fields such as highway bridges, high-rise buildings, and rail transit.

[0003] In related technologies, rotary drilling rigs include a mast, a carriage, and a power head assembly. The carriage is slidably connected to the mast. The power head assembly includes a power head body, a left connecting plate, and a right connecting plate. The left and right connecting plates are connected to the power head body and are fixed to the carriage by pins, so that the power head assembly and the carriage can be detachably connected, thereby meeting the replacement needs of different types of power head assemblies.

[0004] However, when disassembling the pin, a pin puller is required. The pin puller can only operate on one pin at a time, and after disassembling the pin, the pin puller needs to be repositioned and fixed so that it can disassemble the next pin, which reduces the replacement efficiency of the power head assembly. Summary of the Invention

[0005] This application provides a pin installation device, a power head assembly, and a drilling rig to solve the problems of related technologies that use a pin puller to disassemble pins. The pin puller can only operate on one pin at a time, and after disassembling the pin, the pin puller needs to be repositioned and fixed, which reduces the replacement efficiency of the power head assembly.

[0006] In a first aspect, embodiments of this application provide a pin mounting device, comprising:

[0007] A drive unit for connecting to the carriage of a drilling rig, the drive unit having at least one movable shaft on each of its opposite sides;

[0008] Multiple pins are connected to each of the moving shafts, and the driving member is used to drive the multiple moving shafts to move simultaneously, so that the multiple pins move into or out of the bushings on the left and right connecting plates of the power head assembly at the same time.

[0009] In some embodiments, the drive element is one of a hydraulic cylinder, a pneumatic cylinder, and an electric cylinder.

[0010] In some embodiments, a plurality of connectors are also included, each of the pins being connected to a connector, the connectors being used to pass through or detach from the pins and to connect or disconnect from the movable shaft, so as to fix or detach the pins from the movable shaft.

[0011] In some embodiments, the connector includes a connecting bolt for passing through or detaching from the pin and for threadedly connecting or disconnecting from the movable shaft, so as to fix or disconnect the pin from the movable shaft.

[0012] In some embodiments, a plurality of limiting members are also included, with at least one of the limiting members provided on both the left connecting plate and the right connecting plate, the limiting members being used to limit the movement distance of the pin within the bushing.

[0013] In some embodiments, the limiting member includes a limiting plate, which is opposite to the end of the bushing away from the driving member. The limiting plate is used to abut against the pin when the pin moves into the bushing to limit the movement distance of the pin within the bushing.

[0014] In some embodiments, the device further includes a mounting plate and a mounting member, the mounting plate being connected to the drive member, and the mounting member being configured to pass through or detach from the mounting plate and to connect or detach from the carriage, so as to fix or detach the drive member from the carriage.

[0015] In some embodiments, the mounting plate is provided with a plurality of strip holes, which are parallel to each other and spaced apart. Each strip hole is perpendicular to the pin. The mounting member is used to pass through or detach from any of the strip holes, so as to pass through or detach from the mounting plate.

[0016] Secondly, this application provides a power head assembly, including a left connecting plate, a right connecting plate, and the aforementioned pin mounting device. Both the left and right connecting plates are provided with bushings. The driving component of the pin mounting device is used to drive multiple moving shafts to move simultaneously, so that multiple pins move into or out of the bushings simultaneously.

[0017] Thirdly, embodiments of this application provide a drilling rig, including a carriage and the aforementioned power head assembly, wherein the drive component of the pin mounting device is connected to the carriage.

[0018] This application provides a pin mounting device, a power head assembly, and a drilling rig. The pin mounting device, when connecting the slide and the power head assembly, moves the power head assembly toward the slide, so that the bushings on the left and right connecting plates are opposite the pins. A drive unit drives both moving shafts to move simultaneously, causing the moving shafts to move the pins into the bushings, thus connecting the slide to the power head assembly via the pins and bushings. When the power head assembly needs to be removed, the drive unit again drives the both moving shafts to move, causing the moving shafts to simultaneously move multiple pins out of multiple bushings, separating the power head assembly from the slide. The drive unit can simultaneously drive multiple pins to move into or out of multiple bushings, thereby achieving simultaneous installation and removal of multiple pins, improving the efficiency of pin installation and removal, and indirectly improving the replacement efficiency of the power head assembly. Furthermore, since the drive unit is connected to the slide, there is no need to adjust and re-fix the drive unit's position each time the power head assembly is replaced, further improving the replacement efficiency of the power head assembly. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] Figure 1 A schematic diagram of the pin mounting device provided in this application in its usage state. Figure 1 ;

[0021] Figure 2 A schematic diagram of the power head assembly provided in this application;

[0022] Figure 3 A schematic diagram of the pin mounting device provided in this application in its usage state. Figure 2 ;

[0023] Figure 4 A schematic diagram of the pin mounting device provided in this application in its usage state. Figure 3 ;

[0024] Figure 5 for Figure 4 A schematic diagram of the mounting plate.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100. Drive component; 110. Moving axis;

[0027] 200, Pin;

[0028] 300. Connectors;

[0029] 400. Limiting components;

[0030] 500, Mounting plate; 510, Strip hole;

[0031] 600. Installation components;

[0032] 700, Left Connecting Board;

[0033] 800, Right Connecting Board.

[0034] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0035] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0036] In related technologies, rotary drilling rigs include a mast, a carriage, and a power head assembly. The carriage, serving as the load-bearing and moving carrier of the power head assembly, is fitted onto the guide rail structure of the mast in a sliding fit, allowing it to reciprocate up and down along the mast. The power head assembly is the core component for drilling operations. It includes the power head body, a left connecting plate, and a right connecting plate. The left and right connecting plates are rigidly connected to the power head body and connected to the carriage via pins. This pin-based connection method ensures the structural reliability of the power head assembly in transmitting torque and withstanding impact loads during drilling operations, while also enabling a detachable connection between the power head assembly and the carriage. This allows for the replacement of different types of power head assemblies based on different geological conditions during engineering construction.

[0037] However, in the actual disassembly process, workers need to use a shaft puller to remove the pins. Due to the limitations of the shaft puller's structure and operation method, the shaft puller can only clamp and apply force to a single pin at a time. After removing one pin, the shaft puller must first be released from its current connection position, and then the placement angle and base of the shaft puller must be readjusted according to the installation position of the next pin. Only after precise positioning can the disassembly process of the next pin begin. This step-by-step operation mode prolongs the operation time and reduces the overall replacement efficiency of the power head assembly.

[0038] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0039] Combination Figure 1 and Figure 2 This application provides a pin mounting device, including a drive member 100 and a plurality of pins 200. The drive member 100 is used to connect to the slide of a drilling rig. The drive member 100 has at least one movable shaft 110 on each opposite side. Each movable shaft 110 is connected to a pin 200. The drive member 100 is used to drive the plurality of movable shafts 110 to move simultaneously, so that the plurality of pins 200 move simultaneously into or out of the bushings on the left connecting plate 700 and the right connecting plate 800 of the power head assembly.

[0040] In this embodiment, four bushings are provided. One bushing is provided on the upper and lower parts of the left connecting plate 700, and one bushing is provided on the upper and lower parts of the right connecting plate 800. The bushing on the upper part of the left connecting plate 700 is opposite to the bushing on the upper part of the right connecting plate 800, and the bushing on the lower part of the left connecting plate 700 is opposite to the bushing on the lower part of the right connecting plate 800. There is a moving shaft 110 on each of the opposite sides of the driving member 100. There are two driving members 100. One driving member 100 is opposite to the bushing on the upper part of the left connecting plate 700 and the bushing on the upper part of the right connecting plate 800, and the other driving member 100 is opposite to the bushing on the lower part of the left connecting plate 700 and the bushing on the lower part of the right connecting plate 800.

[0041] By adopting the above technical solution, when it is necessary to connect the carriage and the power head assembly, the power head assembly is moved toward the carriage, so that the bushings on the left connecting plate 700 and the right connecting plate 800 are opposite to the pin 200. The driving component 100 drives the two moving shafts 110 to move simultaneously, so that the moving shafts 110 drive the pin 200 to move into the bushing, so that the carriage is connected to the power head assembly through the pin 200 and the bushing. When it is necessary to remove the power head assembly, the driving component 100 drives the two moving shafts 110 to move again, so that the moving shafts 110 move simultaneously. The drive unit 100 simultaneously moves multiple pins 200 into or out of multiple bushings, thus separating the power head assembly from the carriage. The drive unit 100 can simultaneously drive multiple pins 200 into or out of multiple bushings, thereby enabling the simultaneous installation and removal of multiple pins 200, improving the installation and removal efficiency of the pins 200, and indirectly improving the replacement efficiency of the power head assembly. Furthermore, since the drive unit 100 is connected to the carriage, there is no need to adjust the position of the drive unit 100 and re-fix it each time the power head assembly is replaced, further improving the replacement efficiency of the power head assembly.

[0042] In other embodiments, the same driving member 100 can be used to drive four moving shafts 110 to move simultaneously, so that the four moving shafts 110 simultaneously drive four pins 200 to move into or out of four bushings. Alternatively, the driving member 100 can drive two moving shafts 110 on the same side to move, so that the two moving shafts 110 on the same side drive two pins 200 to move into or out of the bushings at the top and bottom of the left connecting plate 700 simultaneously.

[0043] The drive unit 100 is one of a hydraulic cylinder, a pneumatic cylinder, and an electric cylinder.

[0044] In this embodiment, the driving component 100 is a hydraulic cylinder, and the hydraulic cylinder is a dual-axis hydraulic cylinder.

[0045] By adopting the above technical solution, the cylinder of the dual-axis hydraulic cylinder is equipped with two coaxial moving shafts 110. The pressure difference of hydraulic oil in the cylinder cavity drives the two moving shafts 110 to extend and retract synchronously. The two moving shafts 110 can achieve constant speed movement according to design requirements, thereby driving the two pins 200 to move into or out of the two bushings at the same time. The dual moving shafts 110 of the dual-axis hydraulic cylinder can improve the balance of output load, and the coordinated movement of the two moving shafts 110 can enhance the overall rigidity and impact resistance. In scenarios that require high-precision reciprocating motion or stable output of large loads, the synchronization of the two shafts can also simplify the transmission structure and reduce the installation space.

[0046] In other embodiments, when the driving component 100 is a cylinder or an electric cylinder, the cylinder is a dual-axis cylinder and the electric cylinder is a dual-axis electric cylinder. The dual-axis cylinder uses compressed air as a power source and has the advantages of fast response speed, compact structure, low maintenance cost and strong environmental adaptability; the dual-axis electric cylinder uses a motor to drive a ball screw or synchronous belt drive and has the advantages of wide adjustable stroke range, perfect overload protection function, low energy consumption and no pollution.

[0047] The pin mounting device also includes multiple connectors 300, each pin 200 is connected to a connector 300, the connector 300 is used to pass through or detach from the pin 200, and to connect or detach from the movable shaft 110, so as to fix or detach the pin 200 from the movable shaft 110.

[0048] In this embodiment, there are four pins 200 and four connectors 300, with each connector 300 corresponding to one of the four pins 200.

[0049] By adopting the above technical solution and using the connector 300, the pin 200 can be detachably connected to the movable shaft 110, thereby facilitating the maintenance and replacement of the pin 200.

[0050] The connector 300 includes a connecting bolt for passing through or detaching from the pin 200 and for threading into or detaching from the movable shaft 110, so as to fix or detach the pin 200 from the movable shaft 110.

[0051] In this embodiment, the connecting section passes through or is not passed through the end of the pin 200 away from the driving member 100, and the end of the pin 200 away from the driving member 100 is provided with a groove for accommodating the head of the connecting bolt; in other embodiments, the connecting bolt may also pass through or be not passed through the side wall of the pin 200.

[0052] By adopting the above technical solution, the pin 200 and the moving shaft 110 are fixed by connecting bolts, establishing a rigid and stable force transmission connection between the driving component 100 and the pin 200. This ensures that the thrust or pull force output by the hydraulic cylinder can better act on the pin 200, driving the pin 200 to move smoothly into or out of the bushing. At the same time, this connection method can limit the relative displacement and rotation between the pin 200 and the moving shaft 110, preventing the pin 200 from deflecting or jamming during reciprocating motion, and ensuring the consistency and reliability of disassembly and assembly. In addition, the connecting bolts have convenient disassembly and assembly characteristics, facilitating the maintenance or replacement of components such as the pin 200 in the future, and the preload can be adjusted according to actual working conditions, improving the pin 200's resistance to loosening under vibration and impact conditions.

[0053] In some embodiments, the connector 300 can also be replaced by a first electromagnet or a second electromagnet. The first electromagnet is connected to the pin 200, and the second electromagnet is connected to the movable shaft 110. The first and second electromagnets can be magnetically attracted after being energized, so that the pin 200 and the movable shaft 110 are magnetically attracted or disengaged by the first and second electromagnets. Alternatively, the connector 300 can be replaced by a first snap-fit ​​and a second snap-fit. The first snap-fit ​​is connected to the pin 200, and the second snap-fit ​​is connected to the movable shaft 110. The first and second snap-fits can engage or disengage, so that the pin 200 and the movable shaft 110 are detachably connected by the first and second snap-fits.

[0054] Combination Figure 1 and Figure 3 The pin mounting device also includes multiple limiting members 400. At least one limiting member 400 is provided on both the left connecting plate 700 and the right connecting plate 800. The limiting member 400 is used to limit the movement distance of the pin 200 in the bushing.

[0055] In this embodiment, bushings are provided on the upper and lower parts of the left connecting plate 700 and the upper and lower parts of the right connecting plate 800, and four limiting members 400 are provided, with each of the four limiting members 400 corresponding to one of the four bushings.

[0056] By adopting the above technical solution, the limiting component 400 can limit the movement distance of the pin 200 in the bushing, thereby controlling the assembly depth and disassembly stroke of the pin 200, preventing the pin 200 from interfering with or getting stuck with other external structures due to excessive insertion into the bushing, and also preventing the pin 200 from coming out too much and causing connection failure with the moving shaft 110. At the same time, it ensures that the pin 200 is in a stable force range in the bushing, reducing problems such as off-center load and increased wear caused by excessive displacement, thereby improving the safety and stability of the pin 200 disassembly and assembly process, and improving the assembly accuracy and reliability of the power head assembly and the carriage.

[0057] The limiting member 400 includes a limiting plate, which is opposite to the end of the bushing away from the driving member 100. The limiting plate is used to abut against the pin 200 when the pin 200 moves into the bushing to limit the movement distance of the pin 200 in the bushing.

[0058] In this embodiment, four limiting plates are provided. The limiting plates are connected to the left connecting plate 700 and the right connecting plate 800 by welding, bolting or bonding. In other embodiments, a limiting plate can also be provided on both the left connecting plate 700 and the right connecting plate 800, so that the limiting plate can be opposite to the upper and lower bushings of the left connecting plate 700 at the same time, and one limiting plate can abut against two pins 200 at the same time.

[0059] By adopting the above technical solution, and by setting a limiting plate at the end of the bushing, when the pin 200 moves into the bushing and abuts against the limiting plate, a rigid mechanical limit can be formed on the extreme insertion depth of the pin 200. This can control the assembly position of the pin 200, ensure the consistency of the installation of multiple pins 200, prevent the pin 200 from interfering with or colliding with surrounding components due to excessive insertion, and prevent the pin 200 from axially moving under the vibration and impact of drilling operations, thereby improving the stability of the connection structure between the power head assembly and the carriage.

[0060] In some embodiments, grooves are provided on opposite sides of the left connecting plate 700 and the right connecting plate 800. The grooves are used to accommodate the limiting plate, thereby preventing the limiting plate from protruding from the left connecting plate 700 and the right connecting plate 800 and interfering with other components.

[0061] In some embodiments, a sleeve is fitted on the movable shaft 110, and a spring is provided inside the sleeve. One end of the spring is connected to the movable shaft 110, and the other end of the spring is connected to the sleeve. A pin 200 is connected to the sleeve and is connected to the movable shaft 110 through the sleeve. When the sleeve abuts against the limiting plate, it can drive the sleeve to move on the movable shaft 110, so that the sleeve squeezes the spring and prevents the movable shaft 110 from rigidly abutting against the limiting plate, which would cause damage to the limiting plate.

[0062] Combination Figure 4 and Figure 5The pin mounting device also includes a mounting plate 500 and a mounting component 600. The mounting plate 500 is connected to the drive component 100, and the mounting component 600 is used to pass through or detach from the mounting plate 500 and to connect or detach from the carriage, so as to fix or detach the drive component 100 from the carriage.

[0063] In this embodiment, a set of mounting plates 500 and mounting members 600 is provided, with the mounting plate 500 located in the middle of the drive member 100; in other embodiments, two sets of mounting plates 500 and mounting members 600 may also be provided, with the two mounting plates 500 respectively located on opposite sides of the drive member 100, thereby improving the fixing strength between the drive member 100 and the carriage.

[0064] By adopting the above technical solution, and using the mounting plate 500 and mounting component 600, the drive component 100 can be detachably connected to the carriage, which facilitates disassembly and maintenance when the drive component 100 malfunctions or needs maintenance, reducing equipment downtime maintenance costs; at the same time, the detachable connection method allows for the selection of different specifications of drive components 100 according to the construction conditions, improving versatility and adaptability.

[0065] The mounting plate 500 is provided with multiple strip holes 510, which are parallel to each other and spaced apart. Each strip hole 510 is perpendicular to the pin 200. The mounting part 600 is used to pass through or detach from any one of the strip holes 510, so as to pass through or detach from the mounting plate 500.

[0066] In this embodiment, the mounting component 600 is a mounting bolt. The mounting bolt is used to pass through or detach from any of the slotted holes 510 and to connect or disconnect from the slide with threads, so as to fix or detach the drive component 100 from the slide. The use of mounting bolts to detachably connect the drive component 100 to the slide can improve the structural rigidity of the connection between the drive component 100 and the slide through the preload of the mounting bolts, thereby improving the force stability and movement accuracy of the drive component 100 when driving the pin 200. It can also be quickly disassembled, adjusted, and maintained with conventional tools, making it convenient to flexibly change the specifications of the drive component 100 or adjust the installation angle according to the disassembly and assembly requirements of different pins 200. At the same time, the detachable nature of the mounting bolts will not cause irreversible structural damage to the slide body, preserving the integrity of the original function of the slide. Furthermore, the anti-loosening ability under high-frequency vibration conditions of the drilling rig can be improved by matching anti-loosening washers or anti-loosening thread designs.

[0067] By adopting the above technical solution, when the mounting bolt is inserted into one of the slots 510 and the mounting plate 500 moves on the mounting bolt, the mounting bolt can move along the length of the slot 510. This allows the drive component 100 to adjust its position along the length of the pin 200, which is perpendicular to the length of the pin. This allows for flexible adaptation to the assembly hole center of pins 200 of different specifications, ensuring that the drive axis of the drive component 100 is aligned with the bushing axis. This prevents problems such as uneven load, jamming, or increased wear when the pin 200 moves due to axis deviation. At the same time, it can adapt to the disassembly and assembly needs of pins 200 in different positions within the connection area between the carriage and the left connecting plate 700 and the right connecting plate 800. There is no need to design special drive fixtures for pins 200 in different positions, which improves the versatility and adaptability of the drive component 100 for disassembly and assembly of pins 200 and optimizes the work layout in confined spaces.

[0068] By inserting mounting bolts into different slots 510, the position of the drive component 100 can be easily adjusted along the length of the pin 200. This allows for adaptation to different disassembly and assembly stroke requirements of the pin 200, ensuring precise matching of the connection position between the drive component 100 and the pin 200. This prevents the pin 200 from failing to fully insert into the bushing or from completely disengaging due to insufficient stroke. Simultaneously, it compensates for installation errors and structural deformation after long-term use, ensuring that the axial force output by the drive component 100 is always transmitted along the centerline of the pin 200, reducing off-center wear, and improving the stability and reliability of the pin 200's disassembly and assembly operations. Furthermore, it is compatible with pins 200 of different lengths, enhancing the adaptability of the drive component 100 to disassembly and assembly operations of multiple pin 200 specifications and reducing the design cost of specialized tooling.

[0069] In other embodiments, a drive mechanism may be provided on the carriage to drive the drive member 100 to move on the carriage, thereby adjusting the position of the drive member 100 along the length direction parallel to or perpendicular to the pin 200. The drive mechanism may be a hydraulic cylinder, an electric cylinder, a pneumatic cylinder, or a lead screw sliding module.

[0070] This application embodiment also provides a power head assembly, including a left connecting plate 700, a right connecting plate 800, and a pin mounting device of any of the above embodiments. Both the left connecting plate 700 and the right connecting plate 800 are provided with bushings. The driving member 100 of the pin mounting device is used to drive multiple moving shafts 110 to move simultaneously, so that multiple pins 200 move into or out of the bushings simultaneously.

[0071] The specific structure of the pin mounting device has been described in detail in the above embodiments and will not be repeated here.

[0072] This application also provides a drilling rig, including a carriage and the power head assembly described in the above embodiments, wherein the drive component 100 of the pin mounting device is connected to the carriage.

[0073] The drilling rig provided in this application, when connecting the slide and the power head assembly, moves the power head assembly toward the slide, so that the bushings on the left connecting plate 700 and the right connecting plate 800 are opposite to the pin 200. The hydraulic cylinder drives the two moving shafts 110 to move simultaneously, causing the moving shafts 110 to move the pin 200 into the bushing. The pin 200 can then abut against the limiting plate, allowing the slide to connect to the power head assembly via the pin 200 and the bushing. When the power head assembly needs to be removed, the hydraulic cylinder drives the two moving shafts 110 to move in the opposite direction, allowing... The movable shaft 110 simultaneously drives multiple pins 200 to move out of multiple bushings, causing the power head assembly to separate from the carriage. The hydraulic cylinder can simultaneously drive multiple pins 200 to move into or out of multiple bushings, thereby enabling the simultaneous installation and removal of multiple pins 200, improving the installation and removal efficiency of the pins 200, and thus indirectly improving the replacement efficiency of the power head assembly. Furthermore, since the hydraulic cylinder is connected to the carriage, there is no need to reposition the hydraulic cylinder each time the power head assembly is replaced, further improving the replacement efficiency of the power head assembly.

[0074] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A pin mounting device, characterized in that, include: A drive unit (100) is used to connect to the carriage of the drilling rig, and the drive unit (100) has at least one movable shaft (110) on each of its opposite sides. Multiple pins (200), each of the movable shafts (110) is connected to a pin (200), and the drive member (100) is used to drive the multiple movable shafts (110) to move simultaneously, so that the multiple pins (200) move simultaneously into or out of the bushings on the left connecting plate (700) and the right connecting plate (800) of the power head assembly.

2. The pin mounting device according to claim 1, characterized in that, The drive unit (100) is one of a hydraulic cylinder, a pneumatic cylinder, and an electric cylinder.

3. The pin mounting device according to claim 1, characterized in that, It also includes a plurality of connectors (300), each of the pins (200) is connected to a connector (300), the connector (300) is used to pass through or detach from the pin (200) and to connect or disconnect from the movable shaft (110) to fix or detach the pin (200) from the movable shaft (110).

4. The pin mounting device according to claim 3, characterized in that, The connector (300) includes a connecting bolt for passing through or detaching from the pin (200) and for threading into or detaching from the movable shaft (110) to fix or detach the pin (200) from the movable shaft (110).

5. The pin mounting device according to any one of claims 1-4, characterized in that, It also includes multiple limiting members (400), and at least one of the limiting members (400) is provided on both the left connecting plate (700) and the right connecting plate (800). The limiting member (400) is used to limit the movement distance of the pin (200) within the bushing.

6. The pin mounting device according to claim 5, characterized in that, The limiting member (400) includes a limiting plate, which is opposite to the end of the bushing away from the driving member (100). The limiting plate is used to abut against the pin (200) when the pin (200) moves into the bushing, so as to limit the movement distance of the pin (200) in the bushing.

7. The pin mounting device according to any one of claims 1-4, characterized in that, It also includes a mounting plate (500) and a mounting member (600), the mounting plate (500) being connected to the drive member (100), and the mounting member (600) being used to pass through or detach from the mounting plate (500) and to connect or detach from the carriage, so as to fix or detach the drive member (100) from the carriage.

8. The pin mounting device according to claim 7, characterized in that, The mounting plate (500) is provided with a plurality of strip holes (510), which are parallel to each other and spaced apart. Each strip hole (510) is perpendicular to the pin (200). The mounting member (600) is used to pass through or detach from any of the strip holes (510) to pass through or detach from the mounting plate (500).

9. A power head assembly, characterized in that, The device includes a left connecting plate (700), a right connecting plate (800), and a pin mounting device according to any one of claims 1-8. Both the left connecting plate (700) and the right connecting plate (800) are provided with bushings. The driving member (100) of the pin mounting device is used to drive multiple moving shafts (110) to move simultaneously, so that multiple pins (200) move into or out of the bushings simultaneously.

10. A drilling rig, characterized in that, It includes a carriage and the power head assembly as described in claim 9, wherein the drive element (100) of the pin mounting device is connected to the carriage.

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