CN211201759U - Anchor rod drilling machine capable of adjusting hole expansion diameter - Google Patents

Abstract

An anchor rod drilling machine with adjustable reaming diameter, comprising a drill bit, a fixed seat, a transmission shaft, an outer sleeve and an adjusting rod group, the fixed seat and the drill bit are detachably connected, the outer sleeve is located above the fixed seat, and the outer sleeve Including a transmission shaft hole arranged along the axial direction of the outer sleeve, the adjusting rod group includes a linkage rod and an external expansion rod, the top end of the linkage rod is hinged with the outer sleeve, the bottom end of the external expansion rod is hinged with the fixed seat, and the linkage rod The bottom end is hinged with the top end of the outer expanding rod. The transmission shaft includes an upper occlusal section and a lower section supporting section. The outer sleeve is sleeved on the upper occlusal section. The outer sleeve can move up and down along the upper occlusal section but cannot rotate relatively. The outer diameter of the top of the support section is larger than the diameter of the drive shaft hole, the bottom end of the lower support section is detachably connected to the fixed seat, and the length of the lower support section can be adjusted. The connection will gradually move away from the transmission shaft, and the length of the lower support section is adjusted to adjust the diameter of the reaming hole.

Description

Anchor drilling machine with adjustable diameter of reaming

technical field

The utility model relates to the technical field of engineering, in particular to an anchor rod drilling machine with an adjustable reaming diameter.

Background technique

Geotechnical engineering anchoring technology is an important part of the current geotechnical engineering field, has an important position and significance, and has been widely used in engineering cases in different countries. The bolt support system has the characteristics of efficient resistance to deformation, low requirements for construction conditions, stability and safety, and is currently involved in various engineering fields. In the rapidly developing modern society, the geotechnical anchoring technology has provided great help for the geotechnical engineering construction in our country. The enlarged end anchor, also known as the enlarged head anchor, is a new type of anchoring member that has been widely used in China in recent years. Due to the influence of the end resistance of the soil body at the front end of the enlarged head, the uplift bearing capacity of the enlarged head anchor is doubled compared with that of the ordinary cylindrical anchor. Engineering practice shows that the enlarged head anchor rod has the advantages of low cost, simple construction, economical and environmental protection, etc., and due to the improvement of the bearing capacity of a single anchor, the engineering cost can be greatly reduced. Therefore, the enlarged head bolt has considerable market application value.

The enlarged head anchor rod uses a certain method to ream the bottom of the anchor rod during construction, so that the diameter of the bottom anchoring section is larger than that of the ordinary anchoring section. At present, the commonly used reaming methods for soil expansion head bolts include high-pressure jet cutting and mechanical cutting reaming. Among them, mechanical cutting reaming is easy to be accepted by construction units due to its simple process and small initial investment. Studies have shown that in the design of the bolt anchoring structure, the diameter of the enlarged head of the bolt has a great influence on the pull-out bearing capacity, and is an important factor affecting the effect of the bolt support. Since the design of the bolt is affected by many factors such as rock and soil properties, engineering characteristics, the bearing capacity of the bolt required for the design, the material characteristics, length and construction technology of the bolt itself, the enlarged head bolt enlarges the diameter of the head section and Not the same. This limits the scope of application of each expanding head bolt reaming drill. For different diameter expanding head bolts, it is necessary to match reaming drills with different reaming diameters.

Utility model content

In order to solve the technical problem in the prior art that different diameters of enlarged head anchors need to be matched with reaming drills with different reaming diameters, the purpose of the embodiment of the present application is to provide an anchor rod with an adjustable reaming diameter. Drilling machinery, the length of the middle and lower support sections of the transmission shaft can be adjusted as required, so as to adjust the opening range of the linkage rod and the outer expansion rod, and then adjust the diameter of the reaming hole to match the diameter of the reaming hole. reaming requirements.

An embodiment of the present application provides an anchor rod drilling machine with an adjustable reaming diameter, including a drill bit, a fixed seat, a transmission shaft, a vertically arranged outer sleeve and an adjustment rod group,

The fixing seat is located above the drill bit and the fixing seat and the drill bit are detachably connected,

The outer sleeve is located above the fixing seat and is arranged opposite to the fixing seat, and the outer sleeve includes a transmission shaft hole arranged along the axial direction of the outer sleeve,

The adjusting rod group is arranged between the outer sleeve and the fixed seat. The adjusting rod group includes a linkage rod and an external expansion rod. The top end of the linkage rod is hinged with the outer sleeve, and the bottom end of the external expansion rod is hinged with the fixed seat. The linkage rod The bottom end is hinged with the top end of the outer expansion rod,

The transmission shaft includes an upper occlusal section and a lower support section. The outer sleeve is sleeved on the upper occlusion section through the transmission shaft hole. The outer sleeve can move up and down along the upper occlusal section but cannot rotate relative to it. The outer diameter of the top of the lower support section is larger than The diameter of the drive shaft hole, the bottom end of the lower support section and the fixed seat are detachably connected, and the length of the lower support section can be adjusted. The direction of the axis moves.

In a further improvement, the upper engaging segment and the lower supporting segment are detachably connected. In this way, not only the installation and disassembly between the upper engaging segment and the lower supporting segment are facilitated, but also the upper engaging segment can be directly connected to the fixing seat to increase the diameter of the reaming hole.

In a further improvement, the shape of the cross-section of the upper occlusal segment is a polygon, and the shape of the drive shaft hole is consistent with the shape of the cross-section of the upper occlusal segment. With this arrangement, the relative rotation between the upper engaging segment and the outer sleeve can be restricted.

Further improvement, the lower support section is a telescopic rod. With this arrangement, the length of the lower support section can be adjusted by stretching or retracting the telescopic rod, so that the diameter of the reaming hole can be adjusted.

In a further improvement, the lower support section includes several short support sections, and two adjacent short support sections are detachably connected. With this arrangement, the length of the lower support segment can be changed by connecting short support segments with different numbers of segments, so that the diameter of the reaming hole can be adjusted.

In a further improvement, there are at least two sets of adjustment rods and they are evenly arranged on the outside of the transmission shaft. Setting up multiple sets of adjusting rods can enhance the stability of the structure and improve the hole reaming efficiency.

Further improvement, a first ear seat is fixedly arranged on the bottom surface of the outer sleeve, a second ear seat is fixedly arranged on the fixed seat at a position opposite to the first ear seat, and the top end of the linkage rod passes through the first ear seat The rotating shaft is hinged, and the bottom end of the outer expansion rod is hinged with the second ear seat through the rotating shaft.

Further improvement, the bottom end of the link rod is provided with a second hinge hole, the top end of the outer expansion rod is concavely provided with a first groove that cooperates with the second hinge hole, and the link rod and the outer expansion rod are connected to the second hinge hole through the rotating shaft. The hinge hole cooperates with the first groove to realize hinge.

As a further improvement, the inner side of the outer expansion rod is provided with a linkage rod accommodating groove along the length direction of the outer expansion rod, and the linkage rod can be embedded in the linkage rod accommodation groove. When the anchor rod drilling machine is adjusted to the maximum reaming diameter, the linkage rod can be inserted into the connecting rod accommodating groove, which does not affect the normal reaming operation of the drilling machine at this time, so as to maximize the widening and reaming of the hole. range of diameters.

Further improvement, saw teeth are processed on the outer side of the outer expanding rod. There are serrations processed on the outer expansion rod to increase the hole reaming efficiency of the outer expansion rod.

Compared with the prior art, the beneficial effect that the utility model can achieve is: the transmission shaft includes a lower support section whose length can be adjusted, and by adjusting the length of the lower support section, the distance between the outer sleeve and the fixed seat can be changed. , so as to change the angle between the linkage rod and the outer expansion rod, thereby changing the diameter of the expansion hole of the bolt drilling machine. When in use, the operator can adjust the length of the lower support section according to the specific reaming requirements to meet different construction requirements.

Description of drawings

FIG. 1 is a schematic structural diagram of a bolt drilling machine with an adjustable reaming diameter provided by an embodiment of the present invention.

FIG. 2 is a schematic diagram of the interlocking rod and the external expansion rod in FIG. 1 when they are opened.

FIG. 3 is a cross-sectional view at A-A in FIG. 2 .

4 is a schematic diagram of a drill bit in an embodiment of the present invention.

FIG. 5 is a schematic diagram of a fixing seat in an embodiment of the present invention.

6 is a schematic diagram of a transmission shaft in Embodiment 1 of the present invention.

7 is a schematic diagram of a transmission shaft in Embodiment 2 of the present invention.

In the figure, the outer sleeve 1, the transmission shaft hole 12; the transmission shaft 2, the upper occlusal section 21, the occlusal connection section 211, the lower support section 22, the short support section 221, the fixed connection section 223; the linkage rod 4; the outer expansion rod 5. The first groove 51, the second groove 52; the fixed seat 6, the first threaded hole 62, the second threaded hole 61; the drill bit 7, the connecting section 71; the first ear seat 8; the second ear seat 9.

Detailed ways

In order to better understand the present utility model, the contents of the present utility model are further explained below in conjunction with the embodiments, but the contents of the present utility model are not limited to the following embodiments.

Example 1

Please refer to FIG. 1-FIG. 7, an embodiment of the present utility model provides a bolt drilling machine with an adjustable reaming diameter, including a drill bit 7, a fixing seat 6, a transmission shaft 2, a vertically arranged outer sleeve 1 and Adjustment lever set.

The drill bit 7 is used for drilling into the soil layer.

As shown in FIG. 1 , FIG. 5 and FIG. 6 , the fixing seat 6 is located above the drill bit 7 and the fixing seat 6 is detachably connected with the drill bit 7 . In this embodiment, a first threaded hole 62 and a second threaded hole 61 are recessed in the bottom and the top of the fixing seat 6 respectively, and a drill bit connecting section 71 is fixed on the top of the drill bit 7, and the drill bit connecting section 71 is provided with an external thread. The drill bit 7 and the fixing seat 6 can be fixed by screwing the drill bit connecting section 71 on the drill bit 7 into the first threaded hole 62 . The threaded connection between the drill bit 7 and the fixing seat 6 is convenient for disassembly and installation, and when the drill bit is damaged or the like, the drill bit can be quickly and quickly replaced.

As shown in FIGS. 1 , 5 and 6 , the transmission shaft 2 includes an upper engaging section 21 and a lower supporting section 22 , the upper engaging section 21 and the lower supporting section 22 are detachably connected, and the bottom of the lower supporting section 22 is connected to the fixed seat Removable connection between 6. In this embodiment, the bottom of the upper occlusal segment 21 is fixedly provided with an occlusal connection segment 211 , the occlusal connection segment 211 is provided with an external thread, and the top of the lower support segment 22 is recessed with a third thread that matches the occlusal connection segment 211 The upper occlusal section 21 and the lower support section 22 can be fixed by screwing the occlusal connection section 211 into the third threaded hole (not shown in the figure). The upper occlusal section 21 and the lower support section 22 are detachably connected to facilitate the disassembly and installation between the two. The occlusal connection section 211 on the upper occlusal section 21 can also be matched with the second threaded hole 61, so that the upper occlusal section 21 can be directly fixed on the fixing seat 6 through the cooperation of the occlusal connection section 211 and the second threaded hole 61. Large reaming diameter. The bottom of the lower support section 22 is fixedly provided with a fixed connection section 223, and the fixed connection section 223 is provided with an external thread. Detachable connection with the fixing base 6.

As shown in FIG. 6 , the length of the lower support section 22 can be adjusted. The lower support section 22 in this embodiment is a telescopic rod, and the lower support section 22 includes several short support sections 221. From the top of the lower support section 22 to the bottom direction, The outer diameter of each short support section 221 is gradually reduced in turn, and the short support section 221 located below can be slidably embedded in the adjacent short support section 221 of the previous section, and marbles are arranged in the short support sections 221 located below. (not shown in the figure), and the adjacent short support section 221 of the previous section is provided with a marble clamping hole (not shown in the figure), when the next short support section 221 is removed from it After the adjacent short support section 221 of the previous section is slid and pulled out, the marbles on the short support section 221 of the next section can be ejected and clamped into the marble clamping holes on the short support section 221 of the previous section, so that Two adjacent short support sections 221 can be fixed. During use, the number of sections to slide out the short support section 221 can be determined according to the actual reaming requirements, and fixed through the corresponding marbles and the marble clamping holes, so as to realize the adjustment of the length of the lower support section 22 .

The outer sleeve 1 is located above the fixed seat 6 and is arranged opposite to the fixed seat 6. The outer sleeve 1 includes a transmission shaft hole 12 arranged along the axial direction of the outer sleeve 1, the transmission shaft 2 is arranged vertically, and the length of the upper engaging section 21 The length is equal to that of the drive shaft hole 12 , the outer sleeve 1 is sleeved on the upper occlusal section 21 through the transmission shaft hole 12 , the outer sleeve 1 can move up and down along the upper occlusal section 21 but cannot rotate relatively, so that the outer sleeve 1 can be rotated. When , you can drag the interlocking rod, the outer expansion rod and the drill bit to rotate with it, so that the drilling and reaming operations can be carried out. The outer diameter of the top of the lower support section 22 is larger than the diameter of the transmission shaft hole 12 . A force is applied to the outer sleeve 1 to move in the direction of the fixed seat 6, and the outer sleeve 1 is forced to move along the upper occlusal section 21 to the direction of the fixed seat 6 until the bottom surface of the outer sleeve 1 contacts the top surface of the lower support section 22 , the outer sleeve 1 stops moving.

The shape of the cross section of the transmission shaft hole 12 is a polygon, and the shape of the cross section of the upper engaging section 21 is consistent with the shape of the cross section of the transmission shaft hole 12 . In this embodiment, the shape of the cross section of the transmission shaft hole 12 is a regular hexagon, and the shape of the upper occlusal segment 21 is also a regular hexagon. In this way, the relative movement between the upper engaging segment 21 and the drive shaft hole 12 can be made, and the relative rotation between the upper engaging segment 21 and the outer sleeve 1 can also be restricted. In another embodiment, the cross-section of the limiting segment 21 The shape of the transmission shaft hole 12 may also be other polygonal shapes.

As shown in Figures 1 and 2, the adjustment rod group is arranged between the outer sleeve 1 and the fixed seat 6 and is located outside the transmission shaft 2. The adjustment rod group includes a linkage rod 4 and an outer expansion rod 5. The linkage rod 4 and the outer The length of the expanding rod 5 is equal, the top end of the connecting rod 4 is hinged with the outer sleeve 1 , the bottom end of the external expanding rod 5 is hinged with the fixed seat 6 , and the bottom end of the connecting rod 4 is hinged with the top of the external expanding rod 5 . In this embodiment, the bottom surface of the outer sleeve 1 is fixedly provided with a first ear seat 8 arranged oppositely, and the top end of the link rod 4 is provided with a first hinge hole matched with the first ear seat 8 to connect the first hinge The hole is aligned with the first ear seat 8 and connected by a rotating shaft, so that the top end of the linkage rod 4 can be hinged with the first ear seat 8 . The bottom end of the linkage rod 4 is provided with a second hinge hole, and the top end of the outer expansion rod 5 is concavely provided with a first groove 51 that cooperates with the second hinge hole, and the second hinge hole is aligned with the first groove 51. , and the hinged connection between the linkage rod 4 and the outer expansion rod 5 can be realized by using the rotating shaft to connect. A second ear seat 9 is fixedly arranged on the top surface of the fixed seat 6 at a position opposite to the first ear seat 8 , and a second groove 52 is recessed in the bottom end of the outer expanding rod 5 , and the second groove 52 is connected with the first ear seat 8 . The second ear seat 9 is aligned and connected by a rotating shaft, so that the hinged connection between the outer expansion rod 5 and the fixed seat 6 can be realized.

The distance between the outer sleeve 1 and the fixed seat 6 is changed by changing the length of the lower support section. When the length of the lower support section 22 is gradually shortened, the outer sleeve 1 is gradually approaching the direction of the fixed seat 6, and the outer sleeve 1 will drive the connection between the linkage rod 4 and the outer expansion rod 5 to gradually move away from the transmission shaft 2. , the linkage rod 4 and the outer expansion rod 5 gradually open to the outside of the bolt drilling machine, and the diameter of the expansion hole gradually increases; on the contrary, the length of the lower support section 22 gradually becomes longer, and the outer sleeve 1 and the fixed seat 6 The distance between them also gradually becomes longer, and the outer sleeve 1 will drive the connection between the linkage rod 4 and the external expansion rod 5 to move in the direction of the transmission shaft 2, and then move the linkage rod 4 and the external expansion rod 5 to the anchor rod. The inner side of the hole machine is folded, and the diameter of the reaming hole is gradually reduced. Therefore, by adjusting the length of the lower support section 22 of the transmission shaft 2, the distance between the outer sleeve 1 and the fixed seat 6 can be changed, and then the connecting rod 4 and the outer sleeve can be changed. By adjusting the angle between the expanding rods 6, different diameters of expanding holes can be obtained, and the applicable range of the bolt drilling machine can be increased.

In this embodiment, when the lower support section 22 is adjusted to be at the longest length (that is, the lower short support section 221 in the lower support section 22 is slid and pulled out from the adjacent upper short support section 221 and passed through the corresponding short support section 221) When the marble and the marble clamping hole are fixed, the length of the transmission shaft 2 is equal to the sum of the lengths of the linkage rod 4, the outer expansion rod 5 and the transmission shaft hole 12, and the upper occlusal section 21 is completely located in the transmission shaft. In the shaft hole 13, the angle between the linkage rod 4 and the external expansion rod 5 is the maximum value, and the linkage rod 4 and the external expansion rod 5 are not opened to the outside. Completely folded state, in this state, when the drilling machine is drilling into the soil layer, the outer expansion rod 5 does not carry out the reaming operation; the length of the lower support section 22 is reduced (that is, the short support section 221 located below is slid into the adjacent one. In the previous short support section 221), the distance between the outer sleeve 1 and the fixed seat 6 also decreases, the angle between the linkage rod 4 and the outer expansion rod 5 becomes smaller, and the linkage rod 4 and the outer The expanding rod 5 expands to the outside, and the diameter of the expanding hole increases. As the length of the lower support section 22 gradually decreases, the diameter of the expanding hole gradually increases. In addition, in this embodiment, the upper occlusal segment 21 can be directly fixed on the fixing seat 6 through the cooperation of the occlusal connecting segment 211 and the second threaded hole 61 (that is, the lower support segment 22 is not connected to the upper occlusal segment 21 at this time), In this state, the angle between the interlocking rod 4 and the outer expanding rod 5 is the smallest, and the diameter of the expanding hole is the largest. Therefore, the operator can adjust the diameter of the reaming hole as needed.

Further, in this embodiment, three sets of adjusting rod groups are provided, and the three sets of adjusting rod groups are evenly arranged on the outer side of the transmission shaft 2 . Set up multiple sets of adjustment rods to make the structure more stable and more convenient for operation.

In this embodiment, the inner side of the outer expansion rod 5 is provided with a linkage rod accommodating groove (not shown in the figure) along the length direction of the outer expansion rod 5, and the linkage rod 4 can be embedded in the linkage rod accommodating groove. When the diameter of the reaming hole is the largest, the linkage rod 4 can be accommodated in the linkage rod accommodating groove of the outer expansion rod 5 .

In this embodiment, serrations are processed on the outer side of the outer expanding rod 5 . By processing serrations (not shown in the figure) on the outer expansion rod 5, the hole reaming efficiency of the outer expansion rod can be increased.

During construction, generally, the non-reaming section is drilled first, and then the reaming section is constructed. The drilling machine provided in this embodiment can not only perform the drilling in the reaming section, but also the non-reaming section. Section construction. During the construction of the non-expanding section, the lower support section 22 is adjusted to the longest length. At this time, the linkage rod 4 and the outer expansion rod 5 are in a fully retracted state, and an external force is applied to the outer sleeve 1 to make the outer sleeve 1 Move along the upper occlusal section 21 of the transmission shaft 2 until the bottom surface of the outer sleeve 1 is blocked by the top surface of the lower support section 22, the external force is applied to the outer sleeve 1 to drive the outer sleeve 1 to rotate, and the outer sleeve 1 drives the drill bit 7 Drill into the soil layer, carry out the drilling construction of the non-reaming section, until the expected processing depth of the non-reaming section is reached, stop drilling, and pull the bolt drilling machine provided in this embodiment out of the hole. Carry out the reaming section construction, and adjust the length of the lower support section 22 according to the required reaming diameter. If the reaming diameter to be processed is the maximum reaming diameter provided by the drilling machine, then the occlusion on the upper occlusal section 21 will be adjusted. The connecting section 211 is directly screwed into the second threaded hole 61 on the fixing base 6; after adjusting the diameter of the reaming hole, an external force is applied to the outer sleeve 1 to make the outer sleeve 1 rotate, and the outer sleeve 1 drives the drill bit 7 to the soil layer During drilling, the outer expansion rod 5 simultaneously performs the outer expansion operation to reach the expected processing depth of the reaming section, stops the drilling, and pulls the outer sleeve 1 out of the drilling hole to complete the construction of the reaming section. During the process of pulling the outer sleeve 1 out, under the action of external force and gravity, the linkage rod 4 and the outer expansion rod 5 will gradually close together, such as from the state of FIG. 2 to the state of FIG. 1 .

Example 2

It is basically the same as Embodiment 1, except that the setting of the lower support section 22 is different.

As shown in FIG. 7 , the lower support section 22 in this embodiment includes several short support sections 221 . The outer diameters of the short support sections 221 are all larger than the diameter of the transmission shaft hole 12 , and two adjacent short support sections 221 are detachable. connect. The bottom of each short support section 221 is fixedly provided with a fixed connection section 223, the fixed connection section 223 is provided with external threads, and the top of each short support section 221 is internally recessed with a third threaded hole (not marked in the figure). out), the two adjacent short support sections 221 are threadedly connected and fixed. The short support section 221 at the top is defined as the first short support section. During installation and use, the third threaded hole at the top of the first short support section is fixed with the occlusal connection section 211 on the occlusal section 21 of the upper section. The diameter of the reaming hole determines the number of segments to be connected to the short support segment 221 , and then the fixed connection segment 223 on the lowermost segment of the short support segment 221 is matched with the first threaded hole 62 of the fixing seat 6 .

In this embodiment, the length of the lower support section 22 is changed by changing the number of segments of the short support section 221 in the lower support section 22, thereby adjusting the diameter of the reaming hole.

The parts not involved in the present invention are the same as the prior art or implemented by using the prior art.

The above descriptions are only the preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Those skilled in the art can apply various equivalent changes and improvements on the basis of the above-mentioned embodiments, and all equivalent changes and modifications made within the scope of the claims shall fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides an anchor rod drilling machine of adjustable reaming diameter which characterized in that: comprises a drill bit (7), a fixed seat (6), a transmission shaft (2), an outer sleeve (1) and an adjusting rod group which are vertically arranged,

the fixed seat (6) is positioned above the drill bit (7), the fixed seat (6) is detachably connected with the drill bit (7),

the outer sleeve (1) is positioned above the fixed seat (6) and is arranged opposite to the fixed seat (6), the outer sleeve (1) comprises a transmission shaft hole (12) arranged along the axial direction of the outer sleeve (1),

the adjusting rod group is arranged between the outer sleeve (1) and the fixed seat (6), the adjusting rod group comprises a linkage rod (4) and an outer expanding rod (5), the top end of the linkage rod (4) is hinged with the outer sleeve (1), the bottom end of the outer expanding rod (5) is hinged with the fixed seat (6), the bottom end of the linkage rod (4) is hinged with the top end of the outer expanding rod (5),

transmission shaft (2) support section (22) including upper segment interlock section (21) and hypomere, transmission shaft (2) vertical setting, outer sleeve (1) is established on upper segment interlock section (21) through transmission shaft hole (12) cover, outer sleeve (1) can reciprocate but can not rotate relatively along upper segment interlock section (21), the external diameter at hypomere support section (22) top is greater than the diameter of transmission shaft hole (12), the bottom and fixing base (6) detachable connection of hypomere support section (22), hypomere support section (22) length can be adjusted, support section (22) along with the hypomere and shorten gradually, the junction of trace (4) and outer expanding rod (5) will remove to the direction of keeping away from transmission shaft (2) gradually.

2. An adjustable reaming diameter rock bolt drilling machine according to claim 1, wherein: the upper section occlusion section (21) is detachably connected with the lower section support section (22).

3. An adjustable reaming diameter rock bolt drilling machine according to claim 1, wherein: the cross section of the upper section meshing section (21) is polygonal, and the shape of the transmission shaft hole (12) is consistent with that of the cross section of the upper section meshing section (21).

4. An adjustable reaming diameter rock bolt drilling machine according to claim 1, wherein: the lower section supporting section (22) is a telescopic rod.

5. An adjustable reaming diameter rock bolt drilling machine according to claim 1, wherein: the lower section supporting section (22) comprises a plurality of sections of short supporting sections (221), and two adjacent sections of short supporting sections (221) are detachably connected.

6. An adjustable reaming diameter rock bolt drilling machine according to claim 1, wherein: at least two groups of adjusting rod groups are uniformly arranged on the outer side of the transmission shaft (2).

7. An adjustable reaming diameter rock bolt drilling machine according to claim 1, wherein: the bottom surface of the outer sleeve (1) is fixedly provided with a first ear seat (8), the position, opposite to the first ear seat (8), of the fixed seat (6) is fixedly provided with a second ear seat (9), the top end of the linkage rod (4) is hinged with the first ear seat (8) through a rotating shaft, and the bottom end of the outer expanding rod (5) is hinged with the second ear seat (9) through a rotating shaft.

8. An adjustable reaming diameter rock bolt drilling machine according to claim 7, wherein: the bottom of trace (4) has been seted up the second hinge hole, and the top indent of expanding rod (5) is seted up and is offered first recess (51) with second hinge hole complex, and trace (4) and expanding rod (5) cooperate through pivot and second hinge hole and first recess (51) and realize articulatedly.

9. An adjustable reaming diameter rock bolt drilling machine according to claim 1, wherein: the inner side of the outer expanding rod (5) is provided with a linkage rod accommodating groove along the length direction of the outer expanding rod (5), and the linkage rod (4) can be embedded into the linkage rod accommodating groove.

10. An adjustable reaming diameter rock bolt drilling machine according to claim 9, wherein: sawteeth are processed on the outer side of the outer expanding rod (5).

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