CN213116191U - Reducing drill rod for small-diameter rock drilling bit - Google Patents

Abstract

The utility model discloses a minor diameter is reducing drill rod for rock drill bit belongs to the rock drilling instrument field, must use the rock drill power loss that the adapter sleeve caused, take place easily to rock, rupture taper shank, problem such as manufacturing cost height between drill rod and drill bit when having solved among the prior art drilling minor diameter rock drill hole. The technical scheme adopted is as follows: on the basis of conventional hexagonal drill rod with tail handle and central through hole, the front part of the drill rod body is machined into small cylindrical diameter according to the requirement of drilling hole diameter and drilling depth, the front end part is provided with a cone for direct connection with the small diameter drill bit taper hole, and the rear part of the drill rod is kept intact. So design has removed the middle adapter sleeve from, and the disect insertion minor diameter bore bit cooperates the rock drill and can drill the minor diameter rock bore of 30mm ~18 mm.

Description

Reducing drill rod for small-diameter rock drilling bit

Technical Field

The utility model relates to a rock drilling tool, specifically speaking relate to a drill rod that uses when rock drill utilizes bore bit drilling rock hole.

Background

The drilling of small diameter rock holes, because the electric hammer drilling efficiency is too low, so when needing to drill porous or hard rock in professional occasion, usually use the rock drill that the power is bigger and the efficiency is higher to drill, from hand-held to the air-leg to the platform formula rock drill is optional, can satisfy the drilling requirement of various rocks after cooperation drill rod, bore bit. The drill rod commonly used in China is a hollow hexagonal steel drill rod with a tail handle and opposite sides of 22mm and opposite sides of 25mm, the head of the drill rod is made to have 7 degrees of taper (or other required degrees), the drill bit matched with the drill rod is provided with a 7-degree taper hole (or other required degrees) at the tail, the diameter of the head of the drill bit is usually between 30mm and 42mm, and the drill rod and the drill bit are connected through the taper. When it is desired to drill a rock bore of smaller diameter, typically 20mm, 22mm, 24mm, this simple drill rod + bit approach is no longer suitable because the drill rod diameter is larger than the bore diameter.

For small diameter bits with a diameter below 30mm, there are currently two approaches: firstly, as shown in fig. 1, a drill bit body is lengthened, a taper hole at the tail part is changed into a 7-degree outer cone, the drill bit body is called a long-shank drill bit (1), and then a connecting sleeve (2) with a through center hole and 7-degree taper holes at two ends is connected with a drill rod (3) with a 7-degree outer cone at the head part, namely the long-shank drill bit (1), the connecting sleeve (2) and the drill rod (3) form a set for use. Secondly, as shown in fig. 2, the external shape of the drill bit body is unchanged, the drill bit body is still a 7-degree inner taper hole, a relay connecting rod (5) with a diameter smaller than that of the drill rod is added, the two ends of the relay connecting rod are 7-degree outer tapers, one end of the relay connecting rod is inserted into the drill bit (4), the other end of the relay connecting rod is inserted into the connecting sleeve (2), and the other end of the connecting sleeve (2) is sleeved on the drill rod (3), namely the drill bit (4) + the relay connecting rod (5) + the connecting sleeve (2) + the drill rod (3) form a.

The existing two methods have the following problems: in the first mode, due to the existence of the middle connecting sleeve, the energy transfer process of the impact energy of the rock drill fluctuates, so that the rock drilling power loss is caused, the drilling speed is reduced, and the energy consumption is increased. In the rock drilling process, the drill rod, the connecting sleeve and the long-shank drill bit are easy to deviate in axial degree and loose in connection, the connecting sleeve is far away from the cutting edge of the drill bit, eccentric bending of the connecting position is amplified through a lever principle, the drill rod frequently shakes violently in the drilling process, and the drill rod is broken off from the taper shank of the long-shank drill bit, and the quantity ratio is up to 30% -40%. In the second mode, on the basis of using the connecting sleeve as well, the long-shank drill bit is decomposed into the taper hole drill bit and the relay connecting rod, so that the rock drilling power loss is larger, the stability during drilling is further reduced, and the taper shank at the connecting part is broken frequently. Although the cutting edge of the drill bit is changed from the old type sheet tooth to the more advanced spherical tooth, the comprehensive benefit is still not obvious.

The existence of the connecting sleeve far away from the drill bit cutting edge becomes the bottleneck that the small-diameter drill bit can improve the service life and reduce the problem that the abnormal failure can not exceed the connecting sleeve. The long-shank drill bit or the relay connecting rod has the advantages of high cost of drilling a central deep hole, limited drilling depth and low processing efficiency.

Disclosure of Invention

The utility model aims at providing a rock drilling of no intermediate junction cover is efficient, and the drilling in-process body of rod does not rock, and the taper shank phenomenon of no rupture is removed from and is bored central deep hole process, is suitable for the reducing drill rod that minor diameter bore bit rock drilling was used.

In order to solve the technical problem, the utility model discloses a following technical scheme realizes: the reducing drill rod for the small-diameter rock drilling bit is characterized in that: the drill rod is machined on the basis of a conventional hexagonal drill rod with a tail shank and a central through hole, the front part of the rod body is of a cylindrical small diameter, the front end part of the rod body is provided with a cone for connecting a taper hole of a small-diameter drill bit, the rear part of the drill rod keeps an original shape (the part is of a hexagonal large diameter and comprises the tail shank), and when the drill rod is used, the front end cone of the reducing drill rod is inserted into the taper hole of the small-diameter drill bit, is connected and fastened by impact force in a drilling process, and can drill a small-diameter rock hole of 30 mm-18 mm by matching with a rock drill.

Compared with the prior art, the utility model has the advantages that: the drill rod is integrated into a whole and is directly connected with the drill bit, a middle connecting sleeve is omitted, the impact power of the rock drill is directly transmitted to the drill bit, the drilling efficiency is high, and meanwhile, the phenomenon that the connecting sleeve breaks the taper shank is avoided in principle. The drill rod front end cone is directly inserted into the drill bit taper hole, the connection position is very close to the drill bit cutting edge, even if the drill bit and the drill rod have deviation on concentricity, strong shaking can not be generated, and the taper connection strength is high. The drill rod is provided with a central hole, a central deep hole does not need to be drilled, the outer diameter and the length of the front part of the small rod body and the head cone with proper taper are machined according to the requirements of the rock drilling hole diameter and the rock drilling depth, the production process is simplified, the rock drilling depth is increased, and the cost is reduced.

Drawings

Fig. 1 is a schematic diagram of a first mode of use of the background art.

Fig. 2 is a schematic diagram of a second mode of use of the background art.

Fig. 3 is a schematic view of the usage of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and embodiments:

as shown in fig. 3, the utility model discloses small diameter is reducing drill rod for rock drill bit is on the basis of the conventional hexagon drill rod that has tail handle and central through-hole, the turning is carried out the external diameter to the shank front portion on the numerical control lathe of machining equipment, carry the body of rod position with the lathe chuck earlier, top on the reuse lathe tailstock withstands body of rod front end centre bore, then begin cylindrical minor diameter (32) of turning head cone (31) and body of rod front portion, the car passes through to body of rod rear portion branch hexagon major diameter department with convex (33) outside hole enlargement after the length of needs. The diameter and length of the turning section may be determined according to the hole diameter and the drilling depth. The drill rod with the variable diameter manufactured in the way can be directly used for drilling by sleeving the drill bit (4) with a small diameter on the head cone (31).

Claims (2)

1. The utility model provides a small diameter is reducing drill rod for rock drill bit, has tail handle and cone, and the body of rod center is through-hole, its characterized in that: the front part of the rod body is provided with a cylindrical small diameter (32), the front end part is provided with a cone (31) for connecting a taper hole of a small-diameter drill bit, and the rear part of the rod body is provided with a hexagonal large diameter and comprises a tail handle.

2. A reducing drill rod for a small diameter rock drill bit according to claim 1, wherein: the cylindrical minor diameter (32) of the shank forward portion and the taper (31) of the forward end are machined on a hexagonal shank basis.

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