Multi-drill-bit anchor rod drilling machine end head device

Abstract

The utility model relates to the technical field of jumbolters, in particular to a multi-drill-bit jumbolter end head device which comprises a positioning assembly used for moving and fixing drill bits and a telescopic assembly arranged at the front end of the positioning assembly, the positioning assembly comprises a top plate and rectangular teeth symmetrically arranged in the middle of the top plate, and a positioning frame is arranged in the middle of the top plate in a sleeved mode. The telescopic assembly comprises an outer column arranged at the front end of the positioning frame, a rack belt is arranged above the outer column, gears are arranged at the two ends of the rack belt, and limiting blocks are arranged above the gears close to the positioning frame. The positioning plates arranged at the upper end and the lower end move in the opposite directions, meanwhile, the springs fixedly bonded with the positioning plates drive the positioning blocks to leave the tooth grooves, when the positioning plates move to the needed positions, the symmetrical positioning plates are operated to move in the opposite directions, and the springs drive the positioning blocks to slide into the tooth grooves of the rectangular teeth so that the positioning blocks can be tightly attached to the tooth grooves. The effect of fixing the position of the positioning frame is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor rod drills, in particular to an end device of a multi-bit anchor rod drill. Background Technique

[0002] With the continuous progress of various engineering constructions, such as landslide and dangerous rock mass anchoring projects in the prevention and control of various geological disasters in hydropower stations, railways, and highway slopes, urban deep foundation pit support, anti-floating anchor rods and foundation grouting reinforcement engineering holes, blasting holes in blasting projects, high-pressure jet grouting piles, tunnel pipe shed support holes, etc., anchor rod drilling operations are required. These projects have put forward different requirements for the performance, efficiency, application scope, etc. of anchor rod drills, prompting the continuous development and improvement of anchor rod drills to meet diverse engineering needs;

[0003] The utility model with the publication number of CN212774347U discloses a drilling device for a new type of hydraulic anchor rod drill, which relates to the field of hydraulic drilling. It includes a drill bit sleeve, the bottom of the drill bit sleeve is threadedly connected with a main drill rod, the main drill rod includes a plurality of branch drill rods threadedly connected to each other, and the bottom of the main drill rod is threadedly connected with a rotating fiber sleeve; one end of any one of the branch drill rods and one side of the rotating fiber sleeve close to the branch drill rod are both fixedly provided with a threaded pipe and an annular sealing plate; the other end of any one of the branch drill rods and one side of the drill bit sleeve close to the branch drill rod are both provided with a threaded groove and a sealing groove; an annular inner airbag is adhesively arranged inside the threaded groove, and an annular outer airbag is adhesively arranged inside the sealing groove;

[0004] The above technical solution can effectively prevent water from overflowing from the connection between the two branch drill rods, thereby ensuring the normal flow of water inside the water flow channel, enabling the drill bit to be effectively cooled, and ensuring the service life of the drill bit. However, the number and position of the branch drill rods cannot be changed according to different working environments, and the length of the branch drill rods cannot be telescoped according to actual requirements, resulting in low efficiency of the anchor rod drill. Content of the Utility Model

[0005] The purpose of the utility model is to provide an end device of a multi-bit anchor rod drill to solve the problems that the number and position of the branch drill rods cannot be changed according to different working environments, and the length of the branch drill rods cannot be telescoped according to actual requirements, resulting in low efficiency of the anchor rod drill as mentioned in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A multi-bit bolt drill end device includes a positioning component for bit movement and fixation, and a telescopic component provided at the front end of the positioning component. The positioning component includes a top plate and rectangular teeth symmetrically provided in the middle of the top plate. A positioning frame is sleeved in the middle of the top plate. An opening that fits the shape of the top plate is provided in the middle of the positioning frame, and rectangular grooves are provided at both the upper and lower ends of the positioning frame. Positioning plates are provided in the rectangular grooves. A fixing sleeve is sleeved between the two positioning plates. A positioning block is provided at the rear end of the positioning plate. Springs are provided in the opposite directions of the two positioning blocks. A fixing block is provided between the two springs. The telescopic component includes an outer column provided at the front end of the positioning frame. A rack belt is provided above the outer column. Gears are provided at both ends of the rack belt. A limiting block is provided above the gear close to the positioning frame. A rotating motor is provided above the limiting block. A U-shaped plate is provided near the rear end above the outer column. A moving block is provided at the front end of the limiting block. A fixing strip is provided on one side of the bottom of the moving block. An inner column is provided below the fixing strip.

[0008] Preferably, the top plate and the rectangular teeth are of an integrally formed structure, and the positioning frame is slidably connected to the top plate.

[0009] In the present utility model, tooth grooves are provided inside the rectangular teeth and the tooth grooves are in a shape that fits the positioning block. The provision of the rectangular teeth facilitates the clamping and fixation with the positioning block. The sliding connection between the positioning frame and the top plate enables the telescopic component provided at the front side of the positioning frame to move back and forth on the top plate. The provision of rectangular grooves at both the upper and lower ends of the positioning frame facilitates the back-and-forth movement of the positioning plate inside the rectangular grooves.

[0010] Preferably, the surface of the fixing sleeve is adhesively fixed to the positioning frame, and the shape and size of the rectangular groove are adapted to the positioning plate.

[0011] In the present utility model, the adhesive fixation increases the overall structural strength of the fixing sleeve and the positioning frame. The shape and size adaptation between the rectangular groove and the positioning plate facilitate the back-and-forth movement of the positioning plate inside the rectangular groove. The fixing sleeve is internally slidably connected to the positioning plate and the positioning block connected to the positioning plate. An opening adapted to the width of the positioning block is provided in the middle of the fixing sleeve, enabling the free movement of the positioning plate and the positioning block inside the fixing sleeve.

[0012] Preferably, the positioning plate and the positioning block are welded and fixed. The positioning plate and the outer ends of the springs are welded and fixed. The inner ends of the two springs are both welded and fixed to the fixing block.

[0013] In the present utility model, welding and fixing increases the overall structural strength of the positioning plate and the positioning block. Moving the positioning plate drives the positioning block to change its position. Welding and fixing increases the overall structural strength of the positioning plate and the spring. The spring has telescopic elasticity, enabling elastic movement of the positioning plate and the positioning block connected by the spring. The elastic movement drives the positioning block to be clamped and fixed to and separated from the tooth grooves on the rectangular teeth. Welding and fixing increases the overall structural stability of the spring and the fixed block. Both sides of the fixed block are adhesively fixed to the middle opening of the fixed sleeve, which helps the spring return to its initial position after deformation.

[0014] Preferably, the inner wall of the outer column is slidably connected to the inner column. Both ends of the rack belt are meshed with the gear. The output shaft of the rotary motor passes through the limit block and is adhesively fixed to the gear.

[0015] In the present utility model, the rear end face of the outer column is adhesively fixed to the front side of the positioning frame. The adhesive fixing increases the overall structural strength. The sliding connection enables the inner column to repeatedly move back and forth inside the outer column. The inner diameter of the outer column is adapted to the outer diameter of the inner column, realizing close fitting between the outer column and the inner column. There is a vertical plate on one side of the rotary motor, and the rotary motor is adhesively fixed to the vertical plate. The bottom of the vertical plate is adhesively fixed to the surface of the outer column. The adhesive fixings respectively increase the overall structural strength of the vertical plate, the outer column, and the rotary motor. The adhesive fixing enables the rotary motor to be turned on to drive the gear to continuously rotate. Both ends of the rack belt are meshed with the gear to realize stable rotation of the rack belt. Turning on the rotary motor drives the gear and the rack belt to continuously rotate.

[0016] Preferably, one side of the limit block is rotatably connected to the rack belt, and the bottom of the limit block is adhesively fixed to the top of the outer column. The bottom of the U-shaped plate is adhesively fixed to the outer column.

[0017] In the present utility model, the adhesive fixing increases the overall structural stability of the limit block and the outer column. The rotatable connection between the limit block and the rack belt facilitates limiting the left and right positions of the corresponding part of the rack belt. The U-shaped plate is arranged at a position close to the junction of the outer column and the inner column. The adhesive fixing realizes the overall structural stability of the U-shaped plate and the outer column. There is a rotating shaft on the top of the U-shaped plate, and the rotating shaft is adhesively fixed to the gear provided below the U-shaped plate.

[0018] Preferably, the moving block is adhesively fixed to the rack belt. The bottom of the moving block is adhesively fixed to the fixed strip. The bottom of the fixed strip is adhesively fixed to the corresponding position at the top of the inner column. A drill bit is provided at the bottom front end of the inner column.

[0019] In the present utility model, the bonding fixation increases the overall structural stability of the moving block and the rack belt. The rotation of the driving motor drives the rack belt and the moving block to move. The bottom of the moving block is adhesively fixed to the fixed strip to increase the overall structural strength. The fixed strip is adhesively fixed to the inner column to enable the driving motor to drive the moving block, the fixed strip, and the inner column to move. At the same time, the inner column can expand and contract inside the outer column to change its position and be fixed. The positions where the U-shaped plate and the limiting block are installed form the front-back movement range of the moving block, realizing the stable movement within the fixed range of the moving block. The drill bit is fixedly connected to the inner column by screws, and the screw connection enables the quick disassembly and replacement of the drill bit.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] 1. In the present utility model, by setting the positioning component, the position and quantity of the drill bit of the anchor drill are changed. The positioning plates at the upper and lower ends move towards each other. At the same time, the springs adhesively fixed to the positioning plates drive the positioning blocks away from the tooth grooves. The positioning frame is provided to facilitate the horizontal movement and position change on the roof. When it moves to the required position, the symmetrical positioning plates are operated to move in the opposite direction, and the springs drive the positioning blocks to slide into the tooth grooves of the rectangular teeth, achieving the effect of tightly fitting the positioning blocks and the tooth grooves and fixing the position of the positioning frame. The number of telescopic components can also be increased or decreased according to actual needs by setting the positioning frame. The positioning frame can be increased by sliding the hole into the roof and decreased by sliding the hole out of the roof.

[0022] 2. In the present utility model, by setting the telescopic component, the length of the inner column is changed according to different operation requirements. The outer column and the inner column are slidably connected to enable the inner column to move inside the outer column. By setting the rotation motor to drive the gears at both ends and the rack belt meshing with the gears to rotate, the rotation of the rack belt drives the moving block connected to the rack belt to move back and forth to change its position. The moving block drives the fixed strip connected to it to move, realizing the position change of the inner column connected to the fixed strip. The limiting block and the U-shaped plate are provided on the outer column to facilitate the fixation of the moving range of the moving block, and the inner column realizes the movement within the fixed range. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the end structure of the multi-bit anchor drill of the present utility model;

[0024] Figure 2 is a schematic diagram of the single-group telescopic component and positioning component structure of the present utility model;

[0025] Figure 3 is a schematic diagram of the double-group telescopic component and positioning component structure of the present utility model;

[0026] Figure 4 is a schematic diagram of the disassembled structure of the positioning component of the present utility model;

[0027] Figure 5 Schematic diagram of the limit plate and fixed block structure of the present utility model;

[0028] Figure 6 Schematic diagram of the overall structure of the telescopic assembly of the present utility model.

[0029] The meanings of each label in the figure are as follows:

[0030] 1. Positioning assembly; 10. Top plate; 100. Rectangular teeth; 101. Tooth grooves; 11. Positioning frame; 110. Hole; 111. Rectangular groove; 12. Positioning plate; 120. Fixed sleeve; 121. Spring; 122. Fixed block; 123. Positioning block;

[0031] 2. Telescopic assembly; 20. Outer column; 200. Limit block; 201. U-shaped plate; 21. Rack belt; 210. Rotary motor; 211. Gear; 22. Inner column; 220. Fixed strip; 221. Moving block; 23. Drill bit. Specific implementation mode

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] Please refer to Figure 1-6 , this embodiment provides a technical solution:

[0034] A multi-bit anchor drill head device includes a positioning assembly 1 for the movement and fixation of the drill bit, and a telescopic assembly 2 provided at the front end of the positioning assembly 1. The telescopic assembly includes an outer column 20 provided at the front end of the positioning frame 11, a rack belt 21 provided above the outer column 20, gears 211 provided at both ends of the rack belt 21, a limit block 200 provided above the gear 211 close to the positioning frame 11, a rotary motor 210 provided above the limit block 200, a U-shaped plate 201 provided near the tail end above the outer column 20, a moving block 221 provided at the front end of the limit block 200, a fixed strip 220 provided on one side of the bottom of the moving block 221, and an inner column 22 provided below the fixed strip 220.

[0035] Among them, the inner wall of the outer column 20 is slidably connected to the inner column 22, both ends of the rack belt 21 are meshed with the gears 211, and the output shaft of the rotary motor 210 passes through the limit block 200 and is adhesively fixed to the gear 211.

[0036] In the present utility model, the rear end face of the outer column 20 is adhesively fixed to the front side of the positioning frame 11. The adhesive fixation increases the overall structural strength. The sliding connection enables the inner column 22 to repeatedly move back and forth inside the outer column 20. The inner diameter of the outer column 20 is adapted to the outer diameter of the inner column 22, realizing a tight fit between the outer column 20 and the inner column 22. One side of the rotary motor 210 is provided with a vertical plate, and one side of the rotary motor 210 is adhesively fixed to the vertical plate. The bottom of the vertical plate is adhesively fixed to the surface of the outer column 20. The adhesive fixation respectively increases the overall structural strength of the vertical plate and the outer column 20, and the rotary motor 210. The adhesive fixation enables the rotary motor 210 to be turned on to drive the gear 211 to continuously rotate. Both ends of the rack belt 21 are meshed with the gear 211 to realize the stable rotation of the rack belt 21. Turning on the rotary motor 210 drives the gear 211 and the rack belt 21 to continuously rotate.

[0037] Further, one side of the limiting block 200 is rotatably connected to the rack belt 21, and the bottom of the limiting block 200 is adhesively fixed to the top of the outer column 20. The bottom of the U-shaped plate 201 is adhesively fixed to the outer column 20.

[0038] In the present utility model, the adhesive fixation increases the overall structural stability of the limiting block 200 and the outer column 20. The rotatable connection between the limiting block 200 and the rack belt 21 facilitates the limitation of the left and right positions of the corresponding part of the rack belt 21. The U-shaped plate 201 is arranged at a position close to the junction of the outer column 20 and the inner column 22. The adhesive fixation realizes the overall structural stability of the U-shaped plate 201 and the outer column 20. A rotating shaft is provided at the top of the U-shaped plate 201, and the rotating shaft is adhesively fixed to the gear 211 provided below the U-shaped plate 201.

[0039] Specifically, the moving block 221 is adhesively fixed to the rack belt 21. The bottom of the moving block 221 is adhesively fixed to the fixing strip 220. The bottom of the fixing strip 220 is adhesively fixed to the corresponding position at the top of the inner column 22. A drill bit 23 is provided at the bottom of the front end of the inner column 22.

[0040] In the present utility model, the adhesive fixation increases the overall structural stability of the moving block 221 and the rack belt 21, realizes turning on the rotary motor 210 to drive the rack belt 21 and the moving block 221 to move. The adhesive fixation between the bottom of the moving block 221 and the fixing strip 220 increases the overall structural strength. The adhesive fixation between the fixing strip 220 and the inner column 22 realizes turning on the rotary motor 210 to drive the moving block 221, the fixing strip 220 and the inner column 22 to move positions. At the same time, it realizes the telescopic change of the inner column 22 inside the outer column 20 and fixing of the position. Moreover, the positions where the U-shaped plate 201 and the limiting block 200 are installed form the front and back movement range of the moving block 221, realizing the stable movement within the fixed range of the moving block 221. The drill bit 23 is fixedly connected to the inner column 22 through screws. The screw fixed connection realizes the quick disassembly and replacement of the drill bit 23.

[0041] In addition, the positioning component 1 includes a top plate 10 and rectangular teeth 100 symmetrically arranged in the middle of the top plate 10. A positioning frame 11 is sleeved in the middle of the top plate 10. An opening 110 that fits the shape of the top plate 10 is opened in the middle of the positioning frame 11. Rectangular grooves 111 are opened at both the upper and lower ends of the positioning frame 11. Positioning plates 12 are arranged in the rectangular grooves 111. A fixing sleeve 120 is sleeved between the two positioning plates 12. A positioning block 123 is arranged at the rear end of the positioning plate 12. Springs 121 are arranged in the opposite directions of the two positioning blocks 123. A fixing block 122 is arranged between the two springs 121. The top plate 10 and the rectangular teeth 100 are of an integrally formed structure, and the positioning frame 11 is slidably connected to the top plate 10.

[0042] In the present utility model, a tooth groove 101 is arranged inside the rectangular teeth 100 and the tooth groove 101 is in fit with the shape of the positioning block 123. The arrangement of the rectangular teeth 100 facilitates the clamping and fixing with the positioning block 123. The sliding connection between the positioning frame 11 and the top plate 10 enables the telescopic component 2 arranged on the front side of the positioning frame 11 to move back and forth on the top plate 10. The opening of the rectangular grooves 111 at both the upper and lower ends of the positioning frame 11 facilitates the reciprocating movement of the positioning plates 12 inside the rectangular grooves 111.

[0043] Among them, the surface of the fixing sleeve 120 is adhesively fixed to the positioning frame 11, and the shape and size of the rectangular groove 111 are adapted to the positioning plate 12.

[0044] In the present utility model, the adhesive fixing increases the overall structural strength of the fixing sleeve 120 and the positioning frame 11. The adaptation of the shape and size of the rectangular groove 111 and the positioning plate 12 facilitates the reciprocating movement of the positioning plate 12 inside the rectangular groove 111. The inside of the fixing sleeve 120 is slidably connected to the positioning plate 12 and the positioning block 123 connected to the positioning plate 12. An opening adapted to the width of the positioning block 123 is opened in the middle of the fixing sleeve 120, realizing the free movement of the positioning plate 12 and the positioning block 123 inside the fixing sleeve 120.

[0045] It is worth adding that the positioning plate 12 and the positioning block 123 are welded and fixed, the positioning plate 12 and the outer ends of the springs 121 are welded and fixed, and the inner ends of the two springs 121 are both welded and fixed to the fixing block 122.

[0046] In the present utility model, the welding fixation increases the overall structural strength of the positioning plate 12 and the positioning block 123. Moving the positioning plate 12 drives the positioning block 123 to change its position. The welding fixation increases the overall structural strength of the positioning plate 12 and the springs 121. The springs 121 have telescopic elasticity, realizing the elastic movement of the positioning plates 12 and the positioning blocks 123 connected by the springs 121. The elastic movement drives the positioning block 123 to be clamped and fixed to and separated from the tooth groove 101 on the rectangular teeth 100. The welding fixation increases the overall structural stability of the springs 121 and the fixing block 122. Both sides of the fixing block 122 are adhesively fixed to the middle opening of the fixing sleeve 120, helping the springs 121 to return to the initial position after deformation.

[0047] When the end device of the multi-bit anchor drill of this embodiment is in use, the user first bonds the rear end surface of the outer column 20 to the front side of the positioning frame 11. The bottom of the vertical plate is adhesively fixed to one end of the outer column 20, and one side of the vertical plate is adhesively fixed to the rotary motor 210. The output shaft of the rotary motor 210 passes through the middle of the limit block 200 and is adhesively fixed to the gear 211. The gears 211 at both ends are engaged with the rack belt 21. The limit block 200 is inserted and fixed to the rack belt 21. The limit block 200 provides a stable supporting surface for the rack belt 21. The U-shaped plate 201 is adhesively fixed to the surface of the outer column 20 near the junction with the inner column 22. A rotating shaft is provided at the top of the U-shaped plate 201 and the rotating shaft is adhesively fixed to the gear 211 at the corresponding position inside the U-shaped plate 201. Then the moving block 221 is adhesively fixed to the side of the rack belt 21. One side bottom of the moving block 221 is fixedly connected to the fixed strip 220, and the bottom of the fixed strip 220 is fixedly connected to the top of the inner column 22. The drill bit 23 is fixedly connected to the bottom of the inner column 22 by screws, realizing the quick disassembly and replacement of the drill bit 23. When it is necessary to adjust the length of the telescopic assembly 2, the rotary motor 210 is started to drive the gear 211 and the rack belt 21 engaged with the gear 211 to rotate. The rotation of the rack belt 21 drives the moving block 221 on one side and the fixed strip 220 connected to the moving block 221 to move, realizing the movement of the inner column 22 connected to the fixed strip 220 inside the outer column 20. When the inner column 22 moves to the required position, the rotary motor 210 is turned off;

[0048] The positioning frame 11 is adhesively fixed to the fixed sleeve 120. The upper and lower positioning plates 12 are inserted into the rectangular grooves 111 opened at the upper and lower ends of the positioning frame 11. The two positioning blocks 123 are slid along the openings provided at the rear end of the fixed sleeve 120 to the inner ends of the two positioning plates 12. The fixed sleeve 120 is provided to enable the positioning plates 12 and the positioning blocks 123 to move inside the fixed sleeve 120 and is adhesively fixed to the positioning plates 12. A fixing block 122 is adhesively fixed at the middle position of the opening. One spring 121 is adhesively fixed to each of the upper and lower ends of the fixing block 122, and then the outer ends of the two springs 121 are connected to the positioning plates 12;

[0049] When it is necessary to move the position of the positioning frame 11, the user moves the upper and lower positioning plates 12 towards each other. At this time, the positioning plates 12 drive the positioning blocks 123 to leave the tooth grooves 101 of the rectangular teeth 100, and the positioning frame 11 can move left and right. The spring 121 has elasticity to help the positioning blocks 123 return to the initial position and be tightly connected to the tooth grooves 101. When it moves to the required position, the two positioning plates 12 move in the opposite direction, driving the positioning blocks 123 to closely fit the tooth grooves 101, realizing the position fixation of the positioning frame 11. The number of the positioning frames 11 and the telescopic assemblies 2 can also be increased or decreased according to actual needs. The hole 110 is slid into the top plate 10 to increase the positioning frame 11 and the hole 110 is slid out of the top plate 10 to reduce the number of the positioning frames 11. Among them, the drill bit 23 is connected to an external power supply to realize the corresponding drilling cooperation.

Claims

1. A multi-bit bolt drill end device, comprising a positioning component (1) for bit movement and fixation, and a telescopic component (2) provided at the front end of the positioning component (1), characterized in that: The positioning component (1) includes a top plate (10) and rectangular teeth (100) symmetrically arranged in the middle of the top plate (10). A positioning frame (11) is sleeved in the middle of the top plate (10). A hole (110) that fits the shape of the top plate (10) is opened in the middle of the positioning frame (11). Rectangular grooves (111) are opened at both the upper and lower ends of the positioning frame (11). A positioning plate (12) is provided in the rectangular groove (111). A fixing sleeve (120) is sleeved between the two positioning plates (12). A positioning block (123) is provided at the rear end of the positioning plate (12). Springs (121) are provided in the opposite directions of the two positioning blocks (123). A fixing block (122) is provided between the two springs (121). The telescopic component (2) includes an outer column (20) provided at the front end of the positioning frame (11). A rack belt (21) is provided above the outer column (20). Gears (211) are provided at both ends of the rack belt (21). A limiting block (200) is provided above the gear (211) close to the positioning frame (11). A rotary motor (210) is provided above the limiting block (200). A U-shaped plate (201) is provided near the rear end above the outer column (20). A moving block (221) is provided at the front end of the limiting block (200). A fixing strip (220) is provided on one side of the bottom of the moving block (221). An inner column (22) is provided below the fixing strip (220).

2. The end device of the multi-bit anchor drill according to claim 1, characterized in that: The top plate (10) and the rectangular teeth (100) are of an integrally formed structure, and the positioning frame (11) is slidably connected to the top plate (10).

3. The end device of the multi-bit anchor drill according to claim 1, characterized in that: The surface of the fixing sleeve (120) is adhesively fixed to the positioning frame (11), and the shape and size of the rectangular groove (111) are adapted to the positioning plate (12).

4. The end device of the multi-bit anchor drill according to claim 1, characterized in that: The positioning plate (12) is welded and fixed to the positioning block (123), the positioning plate (12) is welded and fixed to the outer ends of the springs (121), and the inner ends of the two springs (121) are both welded and fixed to the fixing block (122).

5. The end device of the multi-bit anchor drill according to claim 1, characterized in that: The inner wall of the outer column (20) is slidably connected to the inner column (22). Both ends of the rack belt (21) are meshed with the gears (211). The output shaft of the rotary motor (210) passes through the limiting block (200) and is adhesively fixed to the gear (211).

6. The end device of the multi-bit anchor drill according to claim 1, characterized in that: One side of the limiting block (200) is rotatably connected to the rack belt (21), and the bottom of the limiting block (200) is adhesively fixed to the top of the outer column (20). The bottom of the U-shaped plate (201) is adhesively fixed to the outer column (20).

7. The end device of the multi-bit bolt drill according to claim 1, characterized in that: The moving block (221) is adhesively fixed to the rack belt (21), the bottom of the moving block (221) is adhesively fixed to the fixing strip (220), the bottom of the fixing strip (220) is adhesively fixed to the corresponding position at the top of the inner column (22), and a drill bit (23) is provided at the bottom of the front end of the inner column (22).

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