Drill boom structure for engineering driller

Abstract

The utility model relates to the technical field of drilling machine accessories, and discloses a drilling arm structure for an engineering drilling machine, which comprises a connecting block, an adjusting mechanism, a fixing mechanism and a moving block, the adjusting mechanism is arranged at the rear end of the connecting block and comprises a mounting seat, an adjusting groove is formed in the middle of the front end of the mounting seat, and the fixing mechanism is arranged in the adjusting groove. A protection box is fixedly connected to the outer wall of one side of the mounting seat, a first servo motor is arranged on the bottom surface in the protection box, an output shaft of the first servo motor penetrates through the protection box and is fixedly connected with a threaded rod, an adjusting block is in threaded connection with the middle of the outer wall of a rod body of the threaded rod, and the front end of the adjusting block is fixedly connected with a connecting block. The first servo motor in the adjusting mechanism drives the threaded rod to rotate, the position of the adjusting block in the adjusting groove is changed, horizontal fine adjustment of the drill bit is facilitated, the telescopic hydraulic rod in the fixing mechanism drives the convex teeth and the ground nails on the pressing plate to penetrate into the soil layer, and the stability of the drill arm is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling rig accessories, in particular to a drill arm structure for an engineering drilling rig. Background Art

[0002] An engineering drill rig is a type of engineering machinery mainly used for drilling, excavating or performing underground operations. It is widely used in construction, exploration and other fields. The drill arm of an engineering drill rig is a component used to support and position the drill bit, allowing the drill bit to reach the predetermined position and perform drilling operations. It is a key component of the engineering drill rig. Therefore, the structural design of the drill arm is related to the drilling operation capability of the drill rig.

[0003] However, most of the existing drill arm structures for engineering drilling rigs on the market are convenient for adjusting the position of the drill bit over a large range when the working space is sufficient, but are not convenient for fine-tuning the position of the drill bit when the working space is limited. In addition, most of the existing drill arm structures for engineering drilling rigs on the market lack a fixing mechanism for the drill arm, which causes the drill arm to shake due to equipment vibration during drilling operations, reducing the stability of the drill arm and affecting the drilling accuracy of the drill bit.

[0004] Therefore, those skilled in the art provide a drill arm structure for an engineering drill rig to solve the problems raised in the above background technology. Utility Model Content

[0005] The purpose of the present utility model is to solve the shortcomings existing in the prior art, and to propose a drill arm structure for an engineering drilling rig, in which the first servo motor in the adjustment mechanism drives the threaded rod to rotate, thereby changing the position of the adjustment block inside the adjustment slot, thereby facilitating the horizontal fine adjustment of the drill bit, and the telescopic hydraulic rod in the fixing mechanism drives the convex teeth and ground nails on the pressure plate to penetrate into the soil layer, thereby improving the stability of the drill arm.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A drill arm structure for an engineering drilling rig, comprising a connecting block, an adjustment mechanism, a fixing mechanism and a moving block, wherein the rear end of the connecting block is provided with an adjustment mechanism, the adjustment mechanism comprises a mounting seat, an adjustment slot is provided in the middle of the front end of the mounting seat, an outer wall on one side of the mounting seat is fixedly connected to a protection box, a first servo motor is provided on the bottom surface of the interior of the protection box, an output shaft of the first servo motor passes through the protection box and is fixedly connected to a threaded rod, the middle part of the outer wall of the threaded rod is threadedly connected to the adjustment block, the front end of the adjustment block is fixedly connected to the connecting block, the lower end of the front end outer wall of the connecting block is hingedly connected to a lifting hydraulic rod, the upper end of the front end outer wall of the connecting block is hingedly connected to a lifting arm, and the rear end of the upper end of the lifting arm is hingedly connected to a pitching hydraulic rod;

[0008] The upper end of the outer wall of the front end of the lifting arm is hingedly connected to the pitch arm, and the upper end of the pitch arm is provided with a fixing mechanism, and the fixing mechanism includes a fixing block, and sliding grooves are provided on both sides of the upper end of the fixing block, and a rack is fixedly connected to the middle part of the upper end of the fixing block. A cavity is provided in the front end of the interior of the moving block, and a second servo motor is provided on the bottom surface of the interior of the cavity. The output shaft of the second servo motor passes through the moving block and is fixedly connected to a connecting disk, and the outer wall of the front end of the connecting disk is fixedly connected to a drill rod, and the outer wall of the front end of the drill rod is fixedly connected to a drill bit;

[0009] Through the above technical solution, the first servo motor inside the protective box in the adjustment mechanism drives the threaded rod inside the adjustment slot opened on the mounting seat to rotate, so that the adjustment block threadedly connected to the threaded rod slides inside the adjustment slot, and the adjustment block is fixedly connected to the connecting block. The horizontal position of the drilling rig drill bit can be adjusted in a small range by changing the horizontal position of the adjustment block. The vertical position of the drill bit can be changed in conjunction with the lifting hydraulic rod and the pitching hydraulic rod, which is convenient for the staff to fine-tune the drill bit in a small space.

[0010] Furthermore, a rotation slot is provided at the rear end of the middle portion of the lower end of the moving block, a third servo motor is provided on the bottom surface of the rotation slot, an output shaft of the third servo motor is fixedly connected to a transmission gear, a slide slot is provided at the middle portion of the upper end of the pitch arm, a telescopic hydraulic rod is fixedly connected to the upper end of the outer rear end of the pitch arm, a limited slider is fixedly connected to the front end of the middle portion of the lower end of the fixed block, a pressure plate is fixedly connected to the outer wall of the front end of the fixed block, a plurality of convex teeth are fixedly connected to the outer wall of the front end of the pressure plate, and two ground nails are fixedly connected to both sides of the outer wall of the front end of the pressure plate;

[0011] Through the above technical solution, the output shaft of the telescopic hydraulic rod on the pitch arm in the fixing mechanism is fixedly connected to the fixed block, and the limiting slider fixedly connected to the fixed block slides inside the slide groove opened on the pitch arm, so that the fixed block can use the multiple protruding teeth and multiple ground nails on the pressure plate to fix the drill arm on the soil layer, thereby improving the stability of the drill arm structure of the engineering drilling rig during drilling operations.

[0012] Furthermore, the other side of the threaded rod is rotatably connected to the inner wall of the other side of the adjustment slot, and the adjustment block slides inside the adjustment slot;

[0013] Through the above technical solution, the adjustment block sliding inside the adjustment groove is threadedly connected to the threaded rod, and the other side of the threaded rod is rotatably connected to the inner wall on the other side of the adjustment groove, so that the threaded rod can rotate stably under the drive of the first servo motor and drive the adjustment block to change its position in the adjustment groove.

[0014] Furthermore, the front ends of the outer walls on both sides of the adjustment block are fixedly connected with corrugated plates, and the sides of the corrugated plates away from the center of the mounting seat are fixedly connected to the inner wall of the adjustment groove;

[0015] Through the above technical solution, the inner wall of the adjustment groove is fixedly connected by the corrugated plates fixedly connected on both sides of the adjustment block, so that the dust and sand generated during the drilling operation can be blocked by the corrugated plates, and are not easy to enter the interior of the adjustment groove to affect the normal operation of the threaded rod, thereby improving reliability.

[0016] Furthermore, the output shaft of the lifting hydraulic rod is hingedly connected to the lifting arm, and the output shaft of the pitching hydraulic rod is hingedly connected to the pitching arm;

[0017] Through the above technical solution, the output shaft of the lifting hydraulic rod is hingedly connected to the lifting arm and the output shaft of the pitching hydraulic rod is hingedly connected to the pitching arm, so that the vertical position of the drill bit on the fixed block can be changed under the operation of the lifting hydraulic rod and the pitching hydraulic rod.

[0018] Furthermore, the transmission gear is meshed with the rack, and sliding blocks are fixedly connected to both sides of the lower end of the moving block, and the sliding blocks slide inside the sliding groove;

[0019] Through the above technical solution, the sliding block at the lower end of the moving block slides inside the sliding groove, and the transmission gear is engaged with the rack, so that the third servo motor drives the transmission gear to rotate, allowing the moving block to move along the sliding groove on the fixed block under the limitation and guidance of the sliding block to change its position.

[0020] Furthermore, the upper end of the fixed block is fixedly connected to a closed frame, the movable block slides inside the closed frame, and the drill rod is rotatably connected to the closed frame;

[0021] Through the above technical solution, the moving block slides inside the closed frame fixedly connected to the upper end of the fixed block, and the drill rod is rotated and connected to the closed frame, so that the displacement of the moving block can drive the drill rod to extend and retract in the closed frame, thereby changing the drilling depth of the drill bit. The closed frame can block the dust and sand generated during the drilling operation to the outside, preventing it from entering the sliding groove and rack on the fixed block and affecting the movement of the sliding block and the rotation of the transmission gear.

[0022] Furthermore, the output shaft of the telescopic hydraulic rod is fixedly connected to the fixed block, and the limiting slider slides inside the slide groove;

[0023] Through the above technical solution, the output shaft of the telescopic hydraulic rod is fixedly connected to the fixed block and the limiting slider slides inside the slide groove, so that the telescopic hydraulic rod can drive the fixed block fixedly connected to the limiting slider to move along the slide groove, and then transmit the force to the pressure plate, so that the convex teeth and ground nails on the pressure plate can penetrate into the soil layer.

[0024] The utility model has the following beneficial effects:

[0025] 1. The drill arm structure for an engineering drilling rig proposed by the utility model drives the threaded rod inside the adjustment slot provided on the mounting seat to rotate by the first servo motor in the adjustment mechanism, so that the adjustment block threadedly connected to the threaded rod slides inside the adjustment slot, thereby changing the horizontal position of the drill bit. In conjunction with the lifting hydraulic rod and the pitching hydraulic rod, the position of the drill bit in the vertical direction can be changed, which makes it convenient for workers to fine-tune the position of the drill bit in a small space, thereby improving the adaptability of the drill arm structure for the engineering drilling rig.

[0026] 2. The drill arm structure for an engineering drilling rig proposed by the utility model is fixedly connected to a fixed block through the output shaft of the telescopic hydraulic rod on the pitching arm in the fixing mechanism, and cooperates with the limiting slider fixedly connected to the fixed block to slide inside the slide groove provided on the pitching arm, so that the fixed block can use the multiple protruding teeth and multiple ground nails on the pressure plate to fix the drill arm on the soil layer, thereby reducing the shaking of the drill arm, thereby improving the stability of the drill arm structure for the engineering drilling rig during drilling operations, and is conducive to improving the drilling accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the main structure of the drill arm structure for the engineering drilling rig of the utility model;

[0028] Figure 2 This is an exploded view of the drill arm structure for the engineering drilling rig of the utility model;

[0029] Figure 3 This is an axial cross-sectional view of the enclosing frame, fixed block, pitch arm and pressure plate of the drill arm structure for the engineering drilling rig of the utility model;

[0030] Figure 4 This is an exploded view of the movable block, fixed block, pressure plate, pitch arm and sliding block of the drill arm structure for the engineering drilling rig of the utility model;

[0031] Figure 5 This is an axial cross-sectional view of the mounting base and protection box of the drill arm structure for an engineering drilling rig of the present invention;

[0032] Figure 6 for Figure 2 Enlarged view of point A in the middle.

[0033] Legend:

[0034] 1. Connecting block; 2. Lifting hydraulic rod; 3. Lifting arm; 4. Pitching hydraulic rod; 5. Pitching arm; 6. Adjusting mechanism; 601. Mounting seat; 602. Adjusting slot; 603. Protective box; 604. First servo motor; 605. Threaded rod; 606. Adjusting block; 607. Corrugated plate; 7. Fixing mechanism; 701. Fixing block; 702. Telescopic hydraulic rod; 703. Slide slot; 704. Limiting slider; 705. Pressing plate; 706. Protruding tooth; 707. Ground nail; 8. Sliding slot; 9. Rack; 10. Moving block; 11. Cavity; 12. Second servo motor; 13. Connecting plate; 14. Drill rod; 15. Drill bit; 16. Rotating slot; 17. Third servo motor; 18. Transmission gear; 19. Closing frame; 20. Sliding block. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the specific embodiments of the present invention to clearly and completely describe the technical solutions in the specific embodiments of the present invention. Obviously, the specific embodiments described are only part of the specific embodiments of the present invention, not all of the specific embodiments. Based on the specific embodiments of the present invention, all other specific embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 , a specific implementation method provided by the utility model:

[0037] A drill arm structure for an engineering drilling rig comprises a connecting block 1, an adjustment mechanism 6, a fixing mechanism 7 and a moving block 10. The rear end of the connecting block 1 is provided with an adjustment mechanism 6, the adjustment mechanism 6 comprises a mounting seat 601, an adjustment slot 602 is provided in the middle of the front end of the mounting seat 601, an outer wall on one side of the mounting seat 601 is fixedly connected to a protection box 603, a first servo motor 604 is provided on the bottom surface of the interior of the protection box 603, an output shaft of the first servo motor 604 passes through the protection box 603 and is fixedly connected to a threaded rod 605, an adjustment block 606 is threadedly connected to the middle part of the outer wall of the threaded rod 605, a front end of the adjustment block 606 is fixedly connected to the connecting block 1, a lifting hydraulic rod 2 is hingedly connected to the lower end of the front end outer wall of the connecting block 1, a lifting arm 3 is hingedly connected to the upper end of the lifting arm 3, and a pitching hydraulic rod 4 is hingedly connected to the rear end of the upper end of the lifting arm 3;

[0038] The upper end of the front end outer wall of the lifting arm 3 is hingedly connected to the pitch arm 5, and the upper end of the pitch arm 5 is provided with a fixing mechanism 7, which includes a fixed block 701. Sliding grooves 8 are provided on both sides of the upper end of the fixed block 701, and a rack 9 is fixedly connected to the middle part of the upper end of the fixed block 701. A cavity 11 is provided at the front end of the moving block 10, and a second servo motor 12 is provided on the bottom surface of the cavity 11. The output shaft of the second servo motor 12 passes through the moving block 10 and is fixedly connected to a connecting disk 13. The outer wall of the front end of the connecting disk 13 is fixedly connected to a drill rod 14, and the outer wall of the front end of the drill rod 14 is fixedly connected to a drill bit 15.

[0039] The other side of the threaded rod 605 is rotatably connected to the inner wall of the other side of the adjustment groove 602, and the adjustment block 606 slides inside the adjustment groove 602. The adjustment block 606 sliding inside the adjustment groove 602 is threadedly connected to the threaded rod 605, and the other side of the threaded rod 605 is rotatably connected to the inner wall of the other side of the adjustment groove 602, so that the threaded rod 605 can rotate stably under the drive of the first servo motor 604, and drive the adjustment block 606 to change its position in the adjustment groove 602. The front ends of the outer walls on both sides of the adjustment block 606 are fixedly connected with corrugated plates 607, and the side of the corrugated plates 607 away from the center of the mounting seat 601 is fixedly connected to the inner wall of the adjustment groove 602. By means of the corrugated plates 607 fixedly connected on both sides of the adjustment block 606 and the inner wall of the adjustment groove 602, dust and sand generated during the drilling operation can be blocked by the corrugated plates 607 and are not easily prevented from entering the interior of the adjustment groove 602 and affecting the normal operation of the threaded rod 605, thereby improving reliability. The output shaft of the lifting hydraulic rod 2 is hingedly connected to the lifting arm 3, and the output shaft of the pitching hydraulic rod 4 is hingedly connected to the pitching arm 5. By means of the output shaft of the lifting hydraulic rod 2 being hingedly connected to the lifting arm 3 and the output shaft of the pitching hydraulic rod 4 being hingedly connected to the pitching arm 5, the vertical position of the drill bit 15 on the fixed block 701 can be changed during the operation of the lifting hydraulic rod 2 and the pitching hydraulic rod 4.

[0040] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 A rotating groove 16 is provided at the rear end of the middle part of the lower end of the moving block 10, and a third servo motor 17 is provided on the bottom surface of the rotating groove 16. The output shaft of the third servo motor 17 is fixedly connected to the transmission gear 18. A sliding groove 703 is provided in the middle part of the upper end of the pitch arm 5, and the upper end of the outer rear end of the pitch arm 5 is fixedly connected to the telescopic hydraulic rod 702. The front end of the middle part of the lower end of the fixed block 701 is fixedly connected to the limiting slider 704. The outer wall of the front end of the fixed block 701 is fixedly connected to a pressure plate 705. The outer wall of the front end of the pressure plate 705 is fixedly connected to a plurality of convex teeth 706. Two ground nails 707 are fixedly connected to both sides of the outer wall of the front end of the pressure plate 705.

[0041] The transmission gear 18 is meshed with the rack 9, and the sliding blocks 20 are fixedly connected on both sides of the lower end of the moving block 10. The sliding blocks 20 slide inside the sliding groove 8. The sliding block 20 at the lower end of the moving block 10 slides inside the sliding groove 8, and cooperates with the transmission gear 18 to be meshed with the rack 9, so that the third servo motor 17 drives the transmission gear 18 to rotate, so that the moving block 10 can move along the sliding groove 8 on the fixed block 701 under the limitation and guidance of the sliding block 20, and change its position. The upper end of the fixed block 701 is fixedly connected with a closed frame 19, and the moving block 10 slides inside the closed frame 19. The drill rod 14 is rotatably connected to the closed frame 19, and the moving block 10 slides inside the closed frame 19 fixed to the upper end of the fixed block 701, and cooperates with the drill rod 14 to be rotatably connected to the closed frame 19, so that the moving block 10 The displacement can drive the drill rod 14 to extend and retract in the closed frame 19, changing the drilling depth of the drill bit 15, and the closed frame 19 can keep the dust and sand generated during the drilling operation out to prevent it from entering the sliding groove 8 and the rack 9 on the fixed block 701, affecting the movement of the sliding block 20 and the rotation of the transmission gear 18. The output shaft of the telescopic hydraulic rod 702 is fixedly connected to the fixed block 701, and the limit slider 704 slides inside the slide groove 703. The output shaft of the telescopic hydraulic rod 702 is fixedly connected to the fixed block 701 and the limit slider 704 slides inside the slide groove 703. The telescopic hydraulic rod 702 can drive the fixed block 701 fixedly connected to the limit slider 704 to move along the slide groove 703, and then transmit the force to the pressure plate 705, so that the convex teeth 706 and the ground nails 707 on the pressure plate 705 can penetrate into the soil layer.

[0042] Working principle: When using the drill arm structure of the engineering drill rig, the staff first installs the mounting base 601 on the drill rig through multiple bolts, then extends the drill rod 14 with the drill bit 15 fixed thereon into the closed frame 19, opens the hatch on the closed frame 19, and fixes the drill rod 14 to the connecting plate 13 through multiple bolts. Then, the staff drives the drill rig to the place where a hole needs to be drilled via the crawler track provided by the drill rig, uses the controller of the drill rig to control the lifting hydraulic rod 2 and the pitching hydraulic rod 4 to change the vertical position of the drill bit 15, and activates the first servo motor 604 in the protective box 603 through the controller provided by the drill rig to drive the threaded rod 605 to rotate, so that the adjustment block 606 threadedly connected to the threaded rod 605 drives the connecting block 1 to move along the adjustment slot 602 to adjust the horizontal position of the drill bit 15. The position is fine-tuned. Secondly, the staff controls the telescopic hydraulic rod 702 through the controller of the drilling rig to drive the fixed block 701 to move along the slide groove 703, and transmits the force to the pressure plate 705, so that the convex teeth 706 and the ground nails 707 on the pressure plate 705 penetrate into the soil layer, fix the drill arm, and reduce shaking. Finally, the staff starts the second servo motor 12 through the controller of the drilling rig to drive the connecting disk 13 to rotate, and then lets the drill rod 14 drive the drill bit 15 to rotate for drilling operations. At the same time, the staff starts the third servo motor 17 through the controller of the drilling rig to drive the transmission gear 18 to rotate, and the transmission gear 18 is engaged with the rack 9 on the fixed block 701, so that the moving block 10 moves along the sliding groove 8 on the fixed block 701 to change the depth of the drilling hole.

[0043] Finally, it should be noted that the above is only a preferred specific implementation method of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned specific implementation methods, those skilled in the art can still modify the technical solutions described in the aforementioned specific implementation methods or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A drill arm structure for an engineering drilling rig, comprising a connecting block (1), an adjustment mechanism (6), a fixing mechanism (7) and a moving block (10), characterized in that: The rear end of the connecting block (1) is provided with an adjustment mechanism (6), the adjustment mechanism (6) comprises a mounting seat (601), an adjustment slot (602) is provided in the middle of the front end of the mounting seat (601), an outer wall on one side of the mounting seat (601) is fixedly connected to a protection box (603), a first servo motor (604) is provided on the bottom surface inside the protection box (603), an output shaft of the first servo motor (604) passes through the protection box (603) and is fixedly connected to a threaded rod (605), the middle part of the outer wall of the threaded rod (605) is threadedly connected to an adjustment block (606), the front end of the adjustment block (606) is fixedly connected to the connecting block (1), the lower end of the front end outer wall of the connecting block (1) is hingedly connected to a lifting hydraulic rod (2), the upper end of the front end outer wall of the connecting block (1) is hingedly connected to a lifting arm (3), and the rear end of the upper end of the lifting arm (3) is hingedly connected to a pitching hydraulic rod (4); The upper end of the front end outer wall of the lifting arm (3) is hingedly connected to the pitching arm (5), and the upper end of the pitching arm (5) is provided with a fixing mechanism (7), and the fixing mechanism (7) includes a fixing block (701), and sliding grooves (8) are provided on both sides of the upper end of the fixing block (701). The middle part of the upper end of the fixing block (701) is fixedly connected to a rack (9), and the front end of the interior of the moving block (10) is provided with a cavity (11). The bottom surface of the interior of the cavity (11) is provided with a second servo motor (12), and the output shaft of the second servo motor (12) passes through the moving block (10) and is fixedly connected to a connecting disk (13). The outer wall of the front end of the connecting disk (13) is fixedly connected to a drill rod (14), and the outer wall of the front end of the drill rod (14) is fixedly connected to a drill bit (15).

2. The drill arm structure for an engineering drilling rig according to claim 1, characterized in that: A rotation slot (16) is provided at the rear end of the middle portion of the lower end of the moving block (10), a third servo motor (17) is provided on the bottom surface of the rotation slot (16), an output shaft of the third servo motor (17) is fixedly connected to a transmission gear (18), a slide slot (703) is provided at the middle portion of the upper end of the pitch arm (5), a telescopic hydraulic rod (702) is fixedly connected to the upper end of the rear end of the pitch arm (5), a limit slider (704) is fixedly connected to the front end of the middle portion of the lower end of the fixed block (701), a pressure plate (705) is fixedly connected to the outer wall of the front end of the fixed block (701), a plurality of convex teeth (706) are fixedly connected to the outer wall of the front end of the pressure plate (705), and two ground nails (707) are fixedly connected to both sides of the outer wall of the front end of the pressure plate (705).

3. The drill arm structure for an engineering drilling rig according to claim 1, characterized in that: The other side of the threaded rod (605) is rotatably connected to the inner wall of the other side of the adjustment slot (602), and the adjustment block (606) slides inside the adjustment slot (602).

4. The drill arm structure for an engineering drilling rig according to claim 1, characterized in that: The front ends of the outer walls on both sides of the adjustment block (606) are fixedly connected to corrugated plates (607), and the side of the corrugated plates (607) away from the center of the mounting seat (601) is fixedly connected to the inner wall of the adjustment slot (602).

5. The drill arm structure for an engineering drilling rig according to claim 1, characterized in that: The output shaft of the lifting hydraulic rod (2) is hingedly connected to the lifting arm (3), and the output shaft of the pitching hydraulic rod (4) is hingedly connected to the pitching arm (5).

6. The drill arm structure for an engineering drilling rig according to claim 2, characterized in that: The transmission gear (18) is meshedly connected to the rack (9), and sliding blocks (20) are fixedly connected to both sides of the lower end of the moving block (10), and the sliding blocks (20) slide inside the sliding groove (8).

7. The drill arm structure for an engineering drilling rig according to claim 1, characterized in that: The upper end of the fixed block (701) is fixedly connected to a closed frame (19), the movable block (10) slides inside the closed frame (19), and the drill rod (14) is rotatably connected to the closed frame (19).

8. The drill arm structure for an engineering drilling rig according to claim 2, characterized in that: The output shaft of the telescopic hydraulic rod (702) is fixedly connected to the fixed block (701), and the limiting slider (704) slides inside the sliding groove (703).

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