CN113775364B

CN113775364B - Novel roof bolter

Info

Publication number: CN113775364B
Application number: CN202111077581.5A
Authority: CN
Inventors: 王超; 马伟杰; 吴立宏; 吴岳
Original assignee: Tongling Chemical Group Xinqiao Mining Co ltd
Current assignee: Tongling Chemical Group Xinqiao Mining Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2023-12-05
Anticipated expiration: 2041-09-15
Also published as: CN113775364A

Abstract

The invention relates to the field of building engineering related equipment, in particular to a novel anchoring machine, which comprises an air cylinder and bearings, wherein a conical supporting leg is arranged in the middle of the bottom end of the air cylinder, the top end of the air cylinder is fixedly connected with a top seat, the front end of the top seat is provided with an operation arm assembly, the top end of the top seat is fixedly connected with a mounting seat, the top end of the mounting seat is provided with a mounting cavity, the left side and the right side of the mounting seat are respectively and rotatably connected with a linkage shaft through two groups of bearings, the middle of the linkage shaft is fixedly connected with a driven bevel gear, the lower end gear of the driven bevel gear is meshed with a driving bevel gear, the bottom end of the driving bevel gear is fixedly connected with a driving motor output end, the driving motor is fixedly arranged in the middle of the bottom end of the mounting cavity, two groups of pin grooves are symmetrically arranged on the left side and the right side of the outer wall of the linkage shaft, and pin blocks are slidably connected with pin blocks, and linkage gears are fixedly connected with the pin blocks.

Description

Novel roof bolter

Technical Field

The invention relates to the field of building engineering related equipment, in particular to a novel roof bolter.

Background

The anchor rod machine is also called as soil nailing machine and is a pneumatic impact machine, and is mainly used for rock-soil anchor rods, roadbed and slope treatment, underground deep foundation pit supporting and blocking, tunnel surrounding rock stabilization, landslide prevention and other disaster remediation, underground engineering supporting and high-rise building foundation treatment. The method is also suitable for non-prestressed anchor bolt support of deep foundation pit spraying protection and side slope soil nailing engineering.

The roof bolter is pneumatic left-handed or right-handed roof bolter mostly, and the resin stock in pit divide into left-handed model, and the purchase very easily appears the mistake, has the construction of method, and pneumatic transmission efficiency is not very high simultaneously.

Aiming at the problems, the invention designs a novel roof bolter.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a novel roof bolter. The problems are solved to the greatest extent, so that the novel roof bolter which can enable the drill bit to realize forward and reverse rotation and has high transmission efficiency is provided.

The invention is realized by the following technical scheme:

the utility model provides a novel roof bolter, includes cylinder and bearing, cylinder bottom middle part is provided with the conical leg, cylinder top fixedly connected with footstock, the footstock front end is provided with the operation arm assembly, footstock top fixedly connected with mount pad, the installation cavity has been seted up on the mount pad top, the mount pad left and right sides is rotated through two sets of bearings respectively and is connected with the universal joint axle, universal joint axle middle part fixedly connected with driven helical gear, driven helical gear lower extreme gear meshing has the drive helical gear, drive helical gear bottom fixedly connected with driving motor output, driving motor fixed mounting is in the installation cavity bottom middle part, universal joint axle outer wall left and right sides symmetry is equipped with two sets of pin grooves, sliding connection has the round pin piece in the pin groove, fixedly connected with linkage gear on the round pin piece, two sets of linkage gear left side end joint and sliding connection have C type regulation plectrum, C type regulation plectrum left end fixedly connected with indicates the key ring, regulation slider sliding connection has the drive helical gear in the top of installation cavity, the top cap fixedly connected with drive helical gear, six drill bit holder fixedly connected with plug, six drill bit holders fixedly connected with top caps are connected with the rotation axis.

Preferably, the novel support leg comprises a support leg body, and is characterized by further comprising a first hinge shaft, wherein a bottom support seat is sleeved in the middle of the support leg body, two groups of connecting supports are symmetrically arranged on the left side of the top end of the bottom support seat and are hinged with a triangular connecting block through the first hinge shaft, an extension rod is fixedly connected to the top end of the triangular connecting block, and a triangular handle is fixedly connected to the top end of the extension rod.

Preferably, the operation arm assembly comprises a hinged support, a second hinged shaft, a connecting block, connecting arms, an integrated block, a cross arm, an arm sleeve, an air inlet pipe, an air inlet nozzle, a connecting pipe and a connecting nozzle, wherein the hinged support is fixedly connected to the lower portion of the front end of a top seat, the hinged support is hinged to the connecting block through the second hinged shaft, the connecting arms are fixedly connected to the bottom ends of the connecting blocks, the integrated block is arranged at the bottom ends of the connecting arms, the cross arm is provided with two groups of symmetrical and fixedly installed on the left side and the right side of the integrated block, the arm sleeve is sleeved on the cross arm, one end of the air inlet pipe is connected to the left side of the connecting block, the air inlet nozzle is connected to the other end of the air inlet pipe, one end of the connecting pipe is connected to the middle portion of the top end of the left side of the hinged support, and the other end of the connecting pipe is connected to the top seat through the connecting nozzle.

Preferably, the integrated block is provided with an electrical control element in an integrated manner, a first air passage is arranged in the connecting block, a second air passage is arranged in the second hinge shaft, a third air passage is arranged in the left side of the hinge support, the first air passage, the second air passage and the third air passage are sequentially communicated, the upper end of the air inlet pipe is connected with an air inlet of the first air passage, the lower end of the connecting pipe is connected with an air outlet of the third air passage, an air inlet and an air outlet which are communicated with the top end of the air cylinder are arranged in the top seat, and the connecting nozzle is connected with an air inlet of the air inlet and the air outlet.

Preferably, two groups of through mounting holes are respectively arranged on the left side and the right side of the mounting seat, the bearing outer ring is fixedly connected to the inner wall of the mounting hole, and the bearing inner ring is fixedly connected to the outer walls on the left side and the right side of the linkage shaft.

Preferably, the driving motor is electrically connected with a power supply.

Preferably, when the two sets of linkage gears synchronously move to the leftmost end, the left linkage gear is meshed with the driven gear at the moment, and when the two sets of linkage gears synchronously move to the rightmost end, the right linkage gear is meshed with the driven gear at the moment.

Preferably, two groups of rectangular holes penetrating through are symmetrically arranged on the left side and the right side of the top seat, and two sides of the adjusting slide rod are respectively and slidably connected in the rectangular holes.

Preferably, a hexagonal slot is formed in the top end of the drill bit seat, the hexagonal plug is inserted into the hexagonal slot, a threaded hole is formed in the right end of the drill bit seat, and the locking knob is in threaded connection with the threaded hole and is in compression contact with one side of the outer wall of the hexagonal plug.

Preferably, a receiving hopper is fixedly arranged at the top end of the top cover.

The beneficial effects of the invention are as follows: the driving motor drives the driving bevel gear to rotate so as to drive the driven bevel gear to rotate, the driven bevel gear drives the linkage shaft to rotate, any one of two groups of linkage gears respectively arranged on the left side and the right side of the linkage shaft is meshed with the driven gear, so that the driven gear can realize forward rotation or reverse rotation as required, meanwhile, when in adjustment, only the C-shaped adjusting shifting piece is required to drive the two groups of linkage gears to synchronously slide, one group of linkage gears corresponding to the forward rotation or the reverse rotation in the two groups of linkage gears is meshed with the driven gear, and meanwhile, the whole device is better in efficiency compared with starting transmission through gear transmission, and better in drilling effect.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a bottom view of the present invention;

FIG. 3 is a transverse, longitudinal cross-sectional view of the present invention;

FIG. 4 is a longitudinal cross-sectional view of the present invention;

fig. 5 is a cross-sectional view of the present invention at a C-shaped adjustment paddle.

In the figure: the device comprises a 1-cylinder, a 2-conical supporting leg, a 3-bottom support, a 4-connecting support, a 5-first hinge shaft, a 6-triangular connecting block, a 7-extension rod, an 8-triangular handle, a 9-top seat, a 901-air inlet and outlet channel, a 10-hinge support, a 11-second hinge shaft, a 12-connecting block, a 13-connecting arm, a 14-integrated block, a 15-cross arm, a 16-arm sleeve, a 17-air inlet pipe, a 18-air inlet nozzle, a 19-connecting pipe, a 20-connecting nozzle, a 21-mounting seat, a 22-bearing, a 23-linkage shaft, a 2301-pin groove, a 24-driven bevel gear, a 25-driving bevel gear, a 26-driving motor, a 27-linkage gear, a 28-C-type adjusting pulling piece, a 29-adjusting slide bar, a 30-finger-key ring, a 31-top cover, a 32-rotating shaft, a 33-driven gear, a 34-drill head seat, a 35-hexagonal plug, a 36-drill bit, a 37-locking knob and a 38-receiving hopper.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-5, a novel roof bolter comprises a cylinder 1 and a bearing 22, wherein a conical supporting leg 2 is arranged in the middle of the bottom end of the cylinder 1, a top seat 9 is fixedly connected to the top end of the cylinder 1, an operation arm assembly is arranged at the front end of the top seat 9, a mounting seat 21 is fixedly connected to the top end of the top seat 9, a mounting cavity is arranged at the top end of the mounting seat 21, the left side and the right side of the mounting seat 21 are respectively and rotatably connected with a linkage shaft 23 through two groups of bearings 22, a driven bevel gear 24 is fixedly connected to the middle of the linkage shaft 23, a driving bevel gear 25 is meshed with a gear at the lower end of the driven bevel gear 24, the bottom end of the driving bevel gear 25 is fixedly connected with an output end of a driving motor 26, the driving motor 26 is fixedly arranged in the middle of the bottom end of the mounting cavity, two groups of pin grooves 2301 are symmetrically arranged on the left side and the right side of the outer wall of the linkage shaft 23, pin blocks are connected in a sliding manner in the pin grooves 2301, the pin block is fixedly connected with a linkage gear 27, the left side ends of the two groups of linkage gears 27 are clamped and connected with C-shaped adjusting pulling plates 28 in a sliding manner, the left end of each C-shaped adjusting pulling plate 28 is fixedly connected with an adjusting sliding rod 29, the left end of each adjusting sliding rod 29 is fixedly connected with a finger ring 30, each adjusting sliding rod 29 is connected with the left side and the right side of each mounting seat 21 in a sliding manner, the top end of each mounting seat 21 is fixedly connected with a top cover 31, the middle of each top cover 31 is rotationally connected with a rotating shaft 32, the bottom end of each rotating shaft 32 is fixedly connected with a driven gear 33, the driven gears 33 are meshed with any group of linkage gears 27, the top ends of the rotating shafts 32 are fixedly connected with drill bit holders 34, hexagonal plugs 35 are spliced at the top ends of the drill bit holders 34, drill bits 36 are fixedly connected at the top ends of the hexagonal plugs 35, and locking knobs 37 are arranged at the right ends of the drill bit holders 34.

Referring to fig. 1-2, still include first articulated shaft 5, conical leg 2 middle part has cup jointed bottom support 3, symmetry is provided with two sets of linking bridge 4 around bottom support 3 top left side, two sets of linking bridge 4 are articulated through first articulated shaft 5 have triangle connecting block 6, triangle connecting block 6 top fixedly connected with extension rod 7, extension rod 7 top fixedly connected with triangle handle 8, conical leg 2 through setting up and bottom support 3 cooperation use can make the stable fixing of whole device subaerial, the triangle handle that sets up uses the removal whole device that can be fine with extension rod and triangle connecting block 6 cooperation.

Referring to fig. 1, the operation arm assembly includes a hinged support 10, a second hinged shaft 11, a connecting block 12, a connecting arm 13, an integrated block 14, a cross arm 15, an arm sleeve 16, an air inlet pipe 17, an air inlet nozzle 18, a connecting pipe 19 and a connecting nozzle 20, wherein the hinged support 10 is fixedly connected to the lower portion of the front end of the top seat 9, the hinged support 10 is hinged with the connecting block 12 through the second hinged shaft 11, the connecting arm 13 is fixedly connected to the bottom end of the connecting block 12, the integrated block 14 is arranged at the bottom end of the connecting arm 13, the cross arm 15 is provided with two groups of symmetrical and fixedly installed on the left and right sides of the integrated block 14, the arm sleeve 16 is sleeved on the cross arm 15, the left side of the connecting block 12 is connected with one end of the air inlet pipe 17, the other end of the air inlet pipe 17 is connected with the air inlet nozzle 18, one end of the top end of the connecting pipe 19 is connected to the middle of the left side top end of the hinged support 10, the other end of the connecting pipe 19 is connected to the top seat 9 through the connecting nozzle 20, and the whole device can be well controlled through the arranged operation arm assembly.

The integrated block 14 is provided with an electrical control element in an integrated way, the connecting block 12 is internally provided with a first air passage, the second hinge shaft 11 is internally provided with a second air passage, the left side of the hinge bracket 10 is internally provided with a third air passage, the first air passage, the second air passage and the third air passage are sequentially communicated, the upper end of the air inlet pipe 17 is connected with the air inlet of the first air passage, the lower end of the connecting pipe 19 is connected with the air outlet of the third air passage, the top seat 9 is internally provided with an air inlet and outlet passage 901 communicated with the top end of the air cylinder 1, the connecting nozzle 20 is connected with the air inlet of the air inlet and outlet passage 901, and the air cylinder 1 can stretch out and draw back as required after the air inlet pipe 17 is communicated with an air pump.

Two groups of through mounting holes are respectively arranged on the left side and the right side of the mounting seat 21, the outer ring of the bearing 22 is fixedly connected to the inner wall of the mounting hole, and the inner ring of the bearing 22 is fixedly connected to the outer walls on the left side and the right side of the linkage shaft 23.

The driving motor 26 is electrically connected with a power supply, and the whole device can realize the drilling function through the driving motor 26.

Referring to fig. 3 to 5, when the two sets of linkage gears 27 move to the leftmost end synchronously, the left linkage gear 27 gear engages with the driven gear 33 at this time, and when the two sets of linkage gears 27 move to the rightmost end synchronously, the right linkage gear 27 gear engages with the driven gear 33 at this time, the two sets of linkage gears 27 which can slide are arranged to realize forward rotation or reverse rotation of the driven gear 33, so that the drill bit 36 realizes forward rotation or reverse rotation.

Two groups of rectangular holes penetrating through are symmetrically formed in the left side and the right side of the top seat 9, two sides of the adjusting slide bar 29 are respectively connected in the rectangular holes in a sliding mode, the positions of the slide bar 29 can be adjusted according to requirements through the adjusting slide bar 29 in the rectangular holes in a sliding mode, and then two groups of C-shaped adjusting pulling pieces 28 are adjusted to drive two groups of linkage gears 27 to synchronously move, and the drilling forward and backward rotation of the device is adjusted.

Referring to fig. 3, a hexagonal slot is provided at the top end of the drill bit seat 34, a hexagonal plug 35 is inserted into the hexagonal slot, a threaded hole is provided at the right end of the drill bit seat 34, a locking knob 37 is in threaded connection with the threaded hole and is in pressing contact with one side of the outer wall of the hexagonal plug 35, and the drill bit 36 can be well fixed through the locking knob 37, so that the stability of the device is improved.

Referring to fig. 1, a receiving funnel 38 is fixedly mounted on the top end of the top cover 31, and dust and debris generated during drilling can be well collected through the receiving funnel 38.

In the invention, when the device is needed to be used, the whole device is moved into a mine tunnel, the movement is needed to be pulled by a triangular handle 8, after the device is moved to the corresponding position, a conical supporting leg 2 is inserted into the ground, a bottom support 3 is flush with the ground, the output end of an air pump is connected to an air inlet nozzle 18, a downhole resin anchor bit is inserted into a drill bit seat 34, then the downhole resin anchor bit is fixed by tightening a locking knob 37, then according to the forward and reverse rotation mode of a forward and reverse rotation type adjusting device of the downhole resin anchor bit, the finger ring 30 is only needed to be scratched and an adjusting sliding rod 29 is pulled to slide to the left side or the right side relative to forward and reverse rotation along a rectangular hole during adjustment, because a driven bevel gear 24 is fixedly connected to the middle part of a linkage shaft 23, the lower end of the driven bevel gear 24 is meshed with a driving bevel gear 25, the bottom end of the driving bevel gear 25 is fixedly connected with the output end of the driving motor 26, the driving motor 26 is fixedly arranged in the middle of the bottom end of the installation cavity, two groups of pin grooves 2301 are symmetrically arranged on the left side and the right side of the outer wall of the linkage shaft 23, a pin block is connected in a sliding manner in the pin grooves 2301, a linkage gear 27 is fixedly connected on the pin block, the left side ends of the two groups of linkage gears 27 are clamped and connected with a C-shaped adjusting pulling piece 28 in a sliding manner, the left end of the C-shaped adjusting pulling piece 28 is fixedly connected with an adjusting slide bar 29, when the two groups of linkage gears 27 synchronously move to the leftmost end, at the moment, the left side linkage gear 27 is meshed with a driven gear 33, when the two groups of linkage gears 27 synchronously move to the rightmost end, at the moment, the right side linkage gear 27 is meshed with the driven gear 33, the forward rotation or reverse rotation of the driven gear 33 can be realized through the two groups of linkage gears 27 which are arranged, after the adjustment is finished, the driving motor 26 is started, then, an operator holds the arm sleeve 16 sleeved on the cross arm 15 by hands, steps on the horizontally-arranged triangular handle 8 by feet, as the first air passage is arranged inside the connecting block 12, the second air passage is arranged inside the second hinge shaft 11, the third air passage is arranged inside the left side of the hinge bracket 10, the first air passage, the second air passage and the third air passage are sequentially communicated, the upper end of the air inlet pipe 17 is connected with the air inlet of the first air passage, the lower end of the connecting pipe 19 is connected with the air outlet of the third air passage, the inside of the top seat 9 is provided with the air inlet and outlet passage 901 communicated with the top end of the air cylinder 1, and the connecting nozzle 20 is connected with the air inlet of the air inlet and outlet passage 901, so that the air cylinder 1 can stretch out and draw back as required after the air inlet pipe 17 is connected with the air pump, thus the whole device can realize the complete drilling process of the underground resin anchor rod, and the whole device completely overcomes the rigorous requirements of a positive rotation or negative rotation on a machine of a driven pneumatic anchor rod drilling machine, and meanwhile, the transmission efficiency and working efficiency of the device are also improved.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a roof bolter which characterized in that: including cylinder (1) and bearing (22), cylinder (1) bottom middle part is provided with toper landing leg (2), cylinder (1) top fixedly connected with footstock (9), footstock (9) front end is provided with operating arm assembly, footstock (9) top fixedly connected with mount pad (21), install cavity has been seted up on mount pad (21) top, mount pad (21) left and right sides are connected with universal joint axle (23) through two sets of bearings (22) rotation respectively, universal joint axle (23) middle part fixedly connected with driven helical gear (24), driven helical gear (24) lower extreme gear meshing has driving helical gear (25), driving helical gear (25) bottom fixedly connected with driving motor (26) output, driving motor (26) fixed mounting is in the middle part of the install cavity bottom, the symmetry is equipped with two sets of pin grooves (2301) in the left and right sides of outer wall of universal joint axle (23), sliding connection has a pin block in the pin groove, fixedly connected with linkage gear (27) on the pin block respectively, two sets of left end fixed joint connection has (29) to be connected with left and right side adjustment slide bar (28) and fixed joint slide bar (28), the adjusting slide rod (29) is slidably connected to the left side and the right side of the mounting seat (21), a top cover (31) is fixedly connected to the top end of the mounting seat (21), a rotating shaft (32) is rotatably connected to the middle of the top cover (31), a driven gear (33) is fixedly connected to the bottom end of the rotating shaft (32), the driven gear (33) is meshed with any group of linkage gears (27), a drill bit seat (34) is fixedly connected to the top end of the rotating shaft (32), a hexagonal plug (35) is inserted to the top end of the drill bit seat (34), a drill bit (36) is fixedly connected to the top end of the hexagonal plug (35), and a locking knob (37) is arranged at the right end of the drill bit seat (34); when the two groups of linkage gears (27) synchronously move to the leftmost end, at the moment, the left linkage gear (27) is meshed with the driven gear (33), and when the two groups of linkage gears (27) synchronously move to the rightmost end, the right linkage gear (27) is meshed with the driven gear (33).

2. A bolter according to claim 1, wherein: still include first articulated shaft (5), bottom support (3) have been cup jointed at toper landing leg (2) middle part, symmetry is provided with two sets of linking bridge (4) around bottom support (3) top left side, and two sets of linking bridge (4) are articulated through first articulated shaft (5) have triangle connecting block (6), triangle connecting block (6) top fixedly connected with extension rod (7), extension rod (7) top fixedly connected with triangle handle (8).

3. A bolter according to claim 1, wherein: the operation arm assembly comprises a hinged support (10), a second hinged shaft (11), a connecting block (12), a connecting arm (13), an integrated block (14), a cross arm (15), arm sleeves (16), an air inlet pipe (17), an air inlet nozzle (18), a connecting pipe (19) and a connecting nozzle (20), wherein the hinged support (10) is fixedly connected to the lower portion of the front end of a footstock (9), the hinged support (10) is hinged with the connecting block (12) through the second hinged shaft (11), the bottom end of the connecting block (12) is fixedly connected with the connecting arm (13), the integrated block (14) is arranged at the bottom end of the connecting arm (13), the cross arm (15) is provided with two groups of symmetrical fixed mounting on the left side and the right side of the integrated block (14), the arm sleeves (16) are sleeved on the cross arm (15), one end of the air inlet pipe (17) is connected to the left side of the connecting block, the other end of the air inlet nozzle (18) is connected to the other end of the air inlet pipe (17), one end of the left side of the hinged support (10) is connected with one end of the connecting pipe (19), and the other end of the connecting pipe (19) is connected to the footstock (9) through the connecting nozzle (20).

4. A bolter according to claim 3, wherein: the integrated block (14) is provided with an electric control element in an integrated manner, a first air passage is arranged inside the connecting block (12), a second air passage is arranged inside the second hinge shaft (11), a third air passage is arranged inside the left side of the hinge support (10), the first air passage, the second air passage and the third air passage are sequentially communicated, the upper end of the air inlet pipe (17) is connected with an air inlet of the first air passage, the lower end of the connecting pipe (19) is connected with an air outlet of the third air passage, an air inlet and outlet passage (901) communicated with the top end of the air cylinder (1) is arranged inside the top seat (9), and the connecting nozzle (20) is connected with an air inlet of the air inlet and outlet passage (901).

5. A bolter according to claim 1, wherein: two groups of through mounting holes are respectively formed in the left side and the right side of the mounting seat (21), the outer ring of the bearing (22) is fixedly connected to the inner wall of the mounting hole, and the inner ring of the bearing (22) is fixedly connected to the outer walls of the left side and the right side of the linkage shaft (23).

6. A bolter according to claim 1, wherein: the driving motor (26) is electrically connected with a power supply.

7. A bolter according to claim 1, wherein: two groups of rectangular holes which penetrate are symmetrically arranged on the left side and the right side of the top seat (9), and two sides of the adjusting sliding rod (29) are respectively and slidably connected in the rectangular holes.

8. A bolter according to claim 1, wherein: the hexagonal socket is arranged at the top end of the drill bit seat (34), the hexagonal plug (35) is inserted into the hexagonal socket, a threaded hole is arranged at the right end of the drill bit seat (34), and the locking knob (37) is in threaded connection with the threaded hole and is in compression contact with one side of the outer wall of the hexagonal plug (35).

9. A bolter according to claim 1, wherein: the top end of the top cover (31) is fixedly provided with a receiving hopper (38).