Two-layer platform pneumatic drill rod stop pin

Abstract

The utility model relates to petroleum engineering technical field especially is a kind of two-layer platform pneumatic drill rod blocking pin, including derrick, two derrick opposite surface fixedly connected with fixed beam, fixed beam inside is set with cylinder groove, cylinder groove inside fixedly connected with cylinder, cylinder inside is installed with cylinder stem, cylinder stem one end fixedly connected with blocking pin, blocking pin outer wall is set with moving groove, two moving groove inner wall fixedly connected with slide bar, the outer wall of slide bar is sleeved with moving plate, moving plate outer wall fixedly connected with spring, spring one end with moving groove inner wall fixedly connected, moving plate one end swing joint has linkage plate, blocking pin outside is provided with baffle, baffle outer wall fixedly connected with U type board, U type board and linkage plate one end swing joint, blocking pin one end fixedly connected with locking block.The utility model, realized blocking pin automatic locking and unlocking, improved operating efficiency and security, prevent drill rod and blocking pin direct hard collision in moving process and cause blocking pin damage.

Description

Technical Field

[0001] This utility model relates to the field of petroleum engineering, and in particular to a two-tiered pneumatic drill pipe stop pin. Background Technology

[0002] To ensure the safety of the drilling team during tripping operations on the second platform and to prevent accidents caused by the top drive pressing on the drill pipe column when lowering it, the driller is required to lower the traveling block top drive only after the derrickman has pushed the drill pipe column into the finger beam and after receiving a clear lowering signal from the second platform derrickman. This requirement is mainly because the derrickman must squat down and reach out of the platform guardrail to grab the stop pin and pull it down when closing the drill pipe stop pin on the second platform.

[0003] However, during tripping operations, with both hands gripping the drill string, it's impossible to squat down and free up hands to close the drill string stop pin on the second-level platform, making the work extremely inconvenient. To ensure safety, it's required to push the drill string into the finger beam first to ensure safety before proceeding to the next step. This prolongs the operation time and affects the drilling team's efficiency. Furthermore, there have been instances where the drill string has been ejected from the second-level platform due to the derrickman's exhaustion, causing injuries. Additionally, the drill string can directly collide with the stop pin during movement, potentially damaging it. Utility Model Content

[0004] In view of this, this utility model provides a two-tiered pneumatic drill pipe stop pin. The main technical problem it aims to solve is that during tripping operations, both hands are used to hold the drill pipe column, making it impossible to squat down and free up hands to close the two-tiered drill pipe stop pin, which is very inconvenient. To ensure safety, it is necessary to first push the drill pipe column into the finger beam to ensure safety before proceeding to the next step, thus prolonging the operation time and affecting the drilling team's efficiency. Furthermore, there is a risk that the drill pipe column may pop out of the two-tiered platform due to the derrickler's lack of strength, causing personnel injuries. Additionally, the drill pipe may directly collide with the stop pin during movement, causing damage to the stop pin.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a two-tiered pneumatic drill rod stop pin, comprising a derrick, wherein there are two derricks, and a fixed beam is fixedly connected to the opposite faces of the two derricks. Cylinder slots are respectively opened on the left and right sides of the interior of the fixed beams, and cylinders are fixedly connected to the interiors of the cylinder slots on both sides. A cylinder rod is installed inside each cylinder, and a stop pin is fixedly connected to one end of each cylinder rod. A movable groove is opened on the outer wall of the stop pin, and there are two movable grooves. A sliding rod is fixedly connected to the inner wall of each of the two movable grooves. A movable plate is sleeved on the outer wall of each sliding rod, and there are two movable plates. A spring is fixedly connected to the outer wall of each movable plate, and one end of each spring is fixedly connected to the inner wall of the movable groove. A linkage plate is movably connected to one end of each movable plate. The stop pin is externally equipped with two baffles. A U-shaped plate is fixedly connected to the outer wall of each baffle, and there are two U-shaped plates in total. One end of each U-shaped plate is movably connected to a linkage plate. A piston rod is fixedly connected to the outer wall of the linkage plate. A piston ring is fixedly connected to one end of the piston rod. A vent hole is provided inside the piston ring. A sleeve is fixedly connected to the inner wall of the moving groove, and the piston ring is located inside the sleeve. A locking block is fixedly connected to one end of the stop pin. A monkey platform is fixedly connected between the two fixed beams. Locking grooves are provided on the outer walls of both sides of the monkey platform. The locking block is located inside the monkey platform. Two control devices are installed on the top of the monkey platform: a pneumatic control switch one controlling the left cylinder and a pneumatic control switch two controlling the right cylinder.

[0006] By adopting the above technical solution, the automatic locking and unlocking of the stop pin is realized, which improves the operating efficiency and safety, and at the same time prevents the drill rod from directly colliding with the stop pin during the movement, thus preventing damage to the stop pin.

[0007] As a further description of the above technical solution:

[0008] The slide bar is located at the front end of the moving groove, the sleeve is located at the rear end of the moving groove, the outer wall of the baffle is fixedly connected with a limiting rod, and there are multiple limiting rods. The outer wall of the stop pin is provided with a limiting hole, and there are multiple limiting holes. One end of the limiting rod extends into the interior of the limiting hole.

[0009] By adopting the above technical solution, the precise matching of the baffle and the stop pin is ensured, preventing deviation during the movement.

[0010] As a further description of the above technical solution:

[0011] Hollow grooves are formed on both sides of the inner wall of the cylinder groove, and the position of the hollow grooves corresponds to the position of the baffle.

[0012] By adopting the above technical solution, the baffle is given room to move, interference is avoided, and smooth operation is ensured.

[0013] As a further description of the above technical solution:

[0014] The monkey platform is equipped with a guardrail, and the fixed beam has multiple storage slots. The stop pin is located at the connection gap between the fixed beam and the monkey platform.

[0015] By adopting the above technical solutions, space utilization is optimized, drill pipe storage is facilitated, and the safety of the operating platform is enhanced.

[0016] As a further description of the above technical solution:

[0017] The outer wall of the derrick is fixedly connected with two inclined support rods. The top of the upper inclined support rod is fixedly connected to the bottom of the fixed beam, and the top of the lower inclined support rod is fixedly connected to the bottom of the platform.

[0018] By adopting the above technical solutions, the overall structural stability is enhanced and the load-bearing capacity of the equipment is improved.

[0019] As a further description of the above technical solution:

[0020] A transverse support rod is fixedly connected between the two derricks. A connecting rod is fixedly connected to the top of the transverse support rod, and there are two connecting rods. The top of the connecting rod is fixedly connected to the outer wall of the lower inclined support rod. A support plate is fixedly connected to the top of the transverse support rod, and the top of the support plate is fixedly connected to the bottom front end of the derrick.

[0021] By adopting the above technical solutions, the support of the monkey platform is further strengthened to ensure stable and reliable operation of the equipment.

[0022] As a further description of the above technical solution:

[0023] The outer walls of the two derricks are fixedly connected with ladders, which are located at the rear of the derricks.

[0024] By adopting the above technical solutions, it is easier for operators to get in and out, thus improving the convenience of operation.

[0025] By employing the above technical solution, the two-tier pneumatic drill rod stop pin of this utility model has at least the following beneficial effects:

[0026] 1. Compared with existing technologies, this two-layer pneumatic drill rod stop pin, when the equipment is in its initial state, is fixed by a locking block embedded in the locking groove of the drill platform. The baffle is kept stable by the cooperation of the limiting rod and the limiting hole of the stop pin. At this time, the spring is in its natural state, the moving plate is located at the front end of the sliding rod, the linkage plate is connected to the U-shaped plate, and the piston ring is located inside the sleeve. After the operator starts the cylinders on the left and right sides by using pneumatic control switch one and pneumatic control switch two respectively, the cylinder rod pushes the stop pin away from the drill platform, causing the locking block to disengage from the locking groove, and the stop pin begins to move horizontally. If the baffle is subjected to external forces such as drill rod, it will be squeezed inward. In addition, the limiting rod and the limiting hole ensure the smooth movement of the baffle, driving the U-shaped plate to push the linkage plate, which in turn pulls the piston rod, causing the piston ring to slide inside the sleeve. The moving plate compresses the spring along the slide rod, and the vent hole of the piston ring can adjust the air pressure. The sleeve, piston rod, and piston ring form a damping system to buffer the impact of the drill pipe. Subsequently, as the cylinder moves, the two baffles enter their corresponding slots, which provide protective space for the baffles. During the retraction of the cylinder rod, the spring pushes the moving plate to reset, the linkage plate drives the baffles to return to their original position, and the piston ring slides in the opposite direction to balance the air pressure. This effectively prevents the drill pipe from popping out and injuring people when the derrick operator makes a mistake or is physically exhausted, ensuring operational safety, avoiding the need for personnel to squat to operate, reducing back injuries, reducing labor intensity, and reducing the time required to lower the traveling block after the derrick work is completed, thus improving work efficiency. At the same time, it reduces the risk of the drill pipe directly impacting the stop pin.

[0027] 2. Compared with existing technologies, this two-tier pneumatic drill rod stop pin ensures smooth and unobstructed extension and retraction by setting up a mutually cooperating hollow groove and baffle structure. The equipped guardrail and storage slot optimize space utilization while ensuring operational safety. The support system adopts a combination of diagonal support rods and horizontal support rods, which, together with connecting rods and support plates, form a three-dimensional support network, greatly improving the overall structural stability. The provided ladder provides operators with a safe and convenient way to go up and down. Attached Figure Description

[0028] Figure 1 This is a first-view overall structural diagram of a two-tiered pneumatic drill rod stop pin proposed in this utility model.

[0029] Figure 2 This is a front view of a two-tier pneumatic drill rod stop pin proposed in this utility model;

[0030] Figure 3 This is a schematic diagram of a fixing beam for a two-tiered pneumatic drill rod stop pin proposed in this utility model;

[0031] Figure 4 This is a schematic diagram showing the separation of the fixing beam and cylinder of a two-tiered pneumatic drill rod stop pin proposed in this utility model.

[0032] Figure 5 This is a schematic diagram of the stop pin and internal components of a two-tiered pneumatic drill rod stop pin proposed in this utility model.

[0033] Figure 6 This is a schematic diagram of the internal structure of a two-tier pneumatic drill rod stop pin proposed in this utility model.

[0034] Figure 7 This utility model proposes a two-tier pneumatic drill rod stop pin. Figure 6 Enlarged schematic diagram of structure A in the middle;

[0035] Figure 8 This is a schematic diagram of a monkey platform for a two-tiered pneumatic drill rod stop pin proposed in this utility model;

[0036] Figure 9 This is a schematic diagram of the overall structure of a two-tiered pneumatic drill rod stop pin proposed in this utility model from a second perspective.

[0037] Legend:

[0038] 1. Derrick; 2. Fixed beam; 3. Cylinder groove; 4. Cylinder; 5. Cylinder rod; 6. Stop pin; 7. Moving groove; 8. Slide rod; 9. Moving plate; 10. Spring; 11. Linkage plate; 12. Baffle; 13. U-shaped plate; 14. Piston rod; 15. Piston ring; 16. Sleeve; 17. Locking block; 18. Monkey platform; 19. Locking groove; 20. Limiting rod; 21. Limiting hole; 22. Hollowed-out groove; 23. Control device; 23A. Pneumatic switch one; 23B. Pneumatic switch two; 24. Guardrail; 25. Storage groove; 26. Diagonal support rod; 27. Horizontal support rod; 28. Connecting rod; 29. ​​Support plate; 30. Ladder. Detailed Implementation

[0039] Reference Figure 1-9This utility model provides a two-tiered pneumatic drill rod stop pin, comprising a derrick 1, of which there are two derricks 1. A fixed beam 2 is fixedly connected to the opposite faces of the two derricks 1. Cylinder grooves 3 are respectively opened on the left and right sides of the interior of the fixed beams 2. Cylinders 4 are fixedly connected to the interior of the cylinder grooves 3 on both sides. A cylinder rod 5 is installed inside the cylinder 4. A stop pin 6 is fixedly connected to one end of the cylinder rod 5. A movable groove 7 is opened on the outer wall of the stop pin 6, and there are two movable grooves 7. A sliding rod 8 is fixedly connected to the inner wall of the two movable grooves 7. A movable plate 9 is fitted onto the outer wall of rod 8, and there are two movable plates 9. A spring 10 is fixedly connected to the outer wall of movable plate 9, and one end of spring 10 is fixedly connected to the inner wall of movable groove 7. A linkage plate 11 is movably connected to one end of movable plate 9. A baffle 12 is provided on the outside of stop pin 6, and there are two baffles 12. A U-shaped plate 13 is fixedly connected to the outer wall of baffle 12, and there are two U-shaped plates 13. One end of U-shaped plate 13 is movably connected to the linkage plate 11. A piston rod 14 is fixedly connected to the outer wall of linkage plate 11. A piston ring 15 is fixedly connected to one end of the piston rod 14. A vent hole is provided inside the piston ring 15. A sleeve 16 is fixedly connected to the inner wall of the moving groove 7, and the piston ring 15 is located inside the sleeve 16. A locking block 17 is fixedly connected to one end of the stop pin 6. A monkey platform 18 is fixedly connected between the two fixed beams 2. Locking grooves 19 are provided on the outer walls of both sides of the monkey platform 18. The locking block 17 is located inside the monkey platform 18. A control device 23 is installed on the top of the monkey platform 18, and there are two control devices 23, one for controlling the left side. The pneumatic control switch 23A of cylinder 4 and the pneumatic control switch 23B of cylinder 4 on the right side are connected. The slide rod 8 is located at the front end of the moving groove 7, and the sleeve 16 is located at the rear end of the moving groove 7. The outer wall of the baffle 12 is fixedly connected with a limit rod 20, and there are multiple limit rods 20. The outer wall of the stop pin 6 is provided with a limit hole 21, and there are multiple limit holes 21. One end of the limit rod 20 extends into the interior of the limit hole 21. Hollow grooves 22 are provided on both sides of the inner wall of the cylinder groove 3. The position of the hollow groove 22 corresponds to the position of the baffle 12.

[0040] When the equipment is in its initial state, the stop pin 6 is fixed by the locking block 17 embedded in the locking groove 19 of the monkey platform 18. The baffle 12 is kept stable by the limiting rod 20 cooperating with the limiting hole 21 of the stop pin 6. At this time, the spring 10 is in its natural state, the moving plate 9 is located at the front end of the slide rod 8, the linkage plate 11 is connected to the U-shaped plate 13, and the piston ring 15 is located inside the sleeve 16. After the operator starts the cylinder 4 through the control device 23, the cylinder rod 5 pushes the stop pin 6 away from the monkey platform 18, causing the locking block 17 to disengage from the locking groove 19, and the stop pin 6 begins to move horizontally. If the baffle 12 is subjected to external forces such as drill rods, it will be squeezed inward, and with the action of the limiting rod 20 and the limiting hole 21, the baffle 12 is kept stable. The smooth movement of cylinder 2 causes the U-shaped plate 13 to push the linkage plate 11, which in turn pulls the piston rod 14, causing the piston ring 15 to slide within the sleeve 16. At the same time, the moving plate 9 compresses the spring 10 along the slide rod 8. The air pressure can be adjusted through the vent hole of the piston ring 15. The sleeve 16, piston rod 14, and piston ring 15 form a damping system, which buffers the impact of the drill rod. Subsequently, the two baffles 12 move with the cylinder 4 and enter their corresponding hollow grooves 22. The hollow grooves 22 provide protective space for the baffles 12. During the retraction of the cylinder rod 5, the spring 10 pushes the moving plate 9 to reset, and the linkage plate 11 drives the baffles 12 to return to their original positions. The piston ring 15 slides in the opposite direction to balance the air pressure.

[0041] The control device 23 includes a pneumatic switch 23A and a pneumatic switch 23B. Pneumatic switch 23A controls the left cylinder 4, and pneumatic switch 23B controls the right cylinder 4. Their working principle is the same: compressed air is supplied through an external air source to the inlet of pneumatic switch 23A. Pneumatic switch 23A controls the left cylinder 4 via a two-position three-way directional valve. When the valve is in the extended position, compressed air enters the rodless chamber of the left cylinder 4 through the inlet pipe, pushing the cylinder rod 5 of the left cylinder 4 to extend, while air in the rod chamber is discharged through the exhaust port and exhaust pipe. When the valve is in the retracted position, compressed air enters the rod chamber through the exhaust port and exhaust pipe, causing the cylinder rod 5 of the left cylinder 4 to retract, and air in the rodless chamber is discharged through the inlet port. The principle by which pneumatic switch 23B controls the right cylinder 4 is the same as that of pneumatic switch 23A controlling the left cylinder 4. The pneumatic circuit is equipped with a throttle valve to regulate the cylinder's movement speed, and the pipeline is laid inside the derrick 1 or fixed beam 2 through a high-pressure resistant hose. In addition, the one-way throttle valves in the two-chamber pneumatic circuits of the cylinder, together with the vent holes of the piston ring 15, form a buffer system to effectively absorb drill pipe impact. This design complies with the standard "GB / T 786.1-2021 Graphic Symbols for Fluid Transmission Systems and Components" and professional documents such as "Fundamentals of Pneumatic Technology" (Mechanical Industry Press). All pipeline pneumatic circuits are strictly implemented according to the specifications, which is a well-known pneumatic control technology.

[0042] The inside of the monkey platform 18 is equipped with a guardrail 24 to prevent operators from falling. The inside of the fixed beam 2 is provided with a storage slot 25, and there are multiple storage slots 25. The drill rod enters through the gap between the fixed beam 2 and the monkey platform 18, and then enters the storage slot 25. The stop pin 6 is located at the connection gap between the fixed beam 2 and the monkey platform 18.

[0043] The outer wall of the derrick 1 is fixedly connected with inclined support rods 26, and there are two inclined support rods 26. The top of the upper inclined support rod 26 is fixedly connected to the bottom of the fixed beam 2, and the top of the lower inclined support rod 26 is fixedly connected to the bottom of the monkey platform 18, providing support for the monkey platform 18 from the rear.

[0044] A transverse support rod 27 is fixedly connected between the two derricks 1. A connecting rod 28 is fixedly connected to the top of the transverse support rod 27. There are two connecting rods 28 to strengthen the support force on the derrick 18. The top of the connecting rod 28 is fixedly connected to the outer wall of the lower inclined support rod 26. A support plate 29 is fixedly connected to the top of the transverse support rod 27. The top of the support plate 29 is fixedly connected to the bottom front end of the derrick 18 to further support the derrick 18 and improve its stability.

[0045] Two derricks 1 are fixedly connected to the outer walls of the two derricks 1. The derricks 30 are located at the rear of the derricks 1. Operators can enter the monkey platform 18 by going through the derricks 30 and then through the fixed beams 2.

[0046] Working principle: When the equipment is in the initial state, the stop pin 6 is fixed by the locking block 17 embedded in the locking groove 19 of the monkey platform 18. The baffle 12 is kept stable by the limit rod 20 cooperating with the limit hole 21 of the stop pin 6. At this time, the spring 10 is in the natural state, the moving plate 9 is located at the front end of the slide rod 8, the linkage plate 11 is connected to the U-shaped plate 13, and the piston ring 15 is located inside the sleeve 16. After the operator starts the corresponding cylinder 4 by the pneumatic control switch 1 23A and the pneumatic control switch 2 23B respectively, the cylinder rod 5 of the corresponding cylinder 4 pushes the corresponding stop pin 6 away from the monkey platform 18, so that the locking block 17 disengages from the locking groove 19, and the stop pin 6 begins to move horizontally. If the baffle 12 is subjected to external forces such as drill rods, it will be squeezed inward and, at the limit rod 20 The function of 0 and the limiting hole 21 is to ensure the smooth movement of the baffle 12, drive the U-shaped plate 13 to push the linkage plate 11, and then pull the piston rod 14, so that the piston ring 15 slides in the sleeve 16. At the same time, the moving plate 9 compresses the spring 10 along the slide rod 8. The air pressure can be adjusted by the vent hole of the piston ring 15. The sleeve 16, the piston rod 14 and the piston ring 15 form a damping system, which plays the role of buffering the impact of the drill rod. Then, as the cylinder 4 moves, the two baffles 12 enter the corresponding hollow grooves 22 respectively. The hollow grooves 22 provide protective space for the baffles 12. During the process of the cylinder rod 5 retracting, the spring 10 pushes the moving plate 9 to reset, the linkage plate 11 drives the baffle 12 to return to its original position, and the piston ring 15 slides in the opposite direction to balance the air pressure.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A two-tiered pneumatic drill pipe stop pin, comprising a derrick (1), characterized in that: There are two derricks (1), and fixed beams (2) are fixedly connected to the opposite faces of the two derricks (1). Cylinder slots (3) are respectively opened on the left and right sides of the interior of the fixed beams (2). Cylinders (4) are fixedly connected to the interior of the cylinder slots (3) on the left and right sides. Cylinder rods (5) are installed inside the cylinders (4). A stop pin (6) is fixedly connected to one end of the cylinder rod (5). A moving groove (7) is opened on the outer wall of the stop pin (6), and there are two moving grooves (7). The inner wall of the movable groove (7) is fixedly connected to a sliding rod (8), and the outer wall of the sliding rod (8) is fitted with a movable plate (9). There are two movable plates (9). The outer wall of the movable plate (9) is fixedly connected to a spring (10). One end of the spring (10) is fixedly connected to the inner wall of the movable groove (7). One end of the movable plate (9) is movably connected to a linkage plate (11). The outside of the stop pin (6) is provided with a baffle (12). There are two baffles (12). A U-shaped plate (13) is fixedly connected to the wall, and there are two U-shaped plates (13). One end of the U-shaped plate (13) is movably connected to the linkage plate (11). A piston rod (14) is fixedly connected to the outer wall of the linkage plate (11). A piston ring (15) is fixedly connected to one end of the piston rod (14). A vent hole is opened inside the piston ring (15). A sleeve (16) is fixedly connected to the inner wall of the moving groove (7). The piston ring (15) is located inside the sleeve (16). The stop pin (6) One end of the fixed beam (2) is fixedly connected to a locking block (17), and the middle of the two fixed beams (2) is fixedly connected to a monkey platform (18). The outer walls on both sides of the monkey platform (18) are provided with locking grooves (19). The locking block (17) is located inside the monkey platform (18). The top of the monkey platform (18) is equipped with a control device (23), and there are two control devices (23), namely, the pneumatic control switch one (23A) for controlling the cylinder (4) on the left side and the pneumatic control switch two (23B) for controlling the cylinder (4) on the right side.

2. The two-tiered pneumatic drill rod stop pin according to claim 1, characterized in that: The slide bar (8) is located at the front end of the moving groove (7), the sleeve (16) is located at the rear end of the moving groove (7), the outer wall of the baffle (12) is fixedly connected with a limiting rod (20), and there are multiple limiting rods (20). The outer wall of the stop pin (6) is provided with a limiting hole (21), and there are multiple limiting holes (21). One end of the limiting rod (20) extends into the interior of the limiting hole (21).

3. The two-tiered pneumatic drill rod stop pin according to claim 1, characterized in that: Hollow grooves (22) are opened on both sides of the inner wall of the cylinder groove (3), and the position of the hollow grooves (22) corresponds to the position of the baffle (12).

4. The two-tiered pneumatic drill rod stop pin according to claim 1, characterized in that: The monkey platform (18) is equipped with a guardrail (24), and the fixed beam (2) has a storage slot (25) inside. There are multiple storage slots (25), and the stop pin (6) is located at the connection gap between the fixed beam (2) and the monkey platform (18).

5. A two-tiered pneumatic drill rod stop pin according to claim 1, characterized in that: The outer wall of the derrick (1) is fixedly connected with an inclined support rod (26), and there are two inclined support rods (26). The top of the upper inclined support rod (26) is fixedly connected to the bottom of the fixed beam (2), and the top of the lower inclined support rod (26) is fixedly connected to the bottom of the monkey platform (18).

6. A two-tiered pneumatic drill rod stop pin according to claim 5, characterized in that: A transverse support rod (27) is fixedly connected between the two derricks (1). A connecting rod (28) is fixedly connected to the top of the transverse support rod (27), and there are two connecting rods (28). The top of the connecting rod (28) is fixedly connected to the outer wall of the lower inclined support rod (26). A support plate (29) is fixedly connected to the top of the transverse support rod (27). The top of the support plate (29) is fixedly connected to the bottom front end of the monkey platform (18).

7. A two-tiered pneumatic drill rod stop pin according to claim 1, characterized in that: Two of the derricks (1) are fixedly connected to the outer walls of the derricks (1), and the derricks (30) are located on the rear side of the derricks (1).

Images