Drill rod for rock drill

Abstract

The drill rod for the rock drill comprises a plurality of single-section drill rods which are connected through front threads and rear threads, middle threads are arranged on the single-section drill rods, and the thread direction of the middle threads is opposite to the thread directions of the head portions and the tail portions of the single-section drill rods. And the two sections of drill rods can be radially positioned during connection. The middle threads are additionally arranged on the drill rod body and can effectively grind rock cracks during repeated advancing and retreating, so that the drill rod is prevented from being clamped at the cracks, it is guaranteed that the drill rod can advance or retreat smoothly, drill rod losses are reduced, and the construction progress is guaranteed; the thread direction of the middle thread is opposite to the screwing direction of the drill rod, reverse thrust can be generated through the threads on the surface of the drill rod and extrusion rock when the drill rod encounters pumice, retreating power of the drill rod is enhanced, and the risk that the drill rod is clamped by the pumice is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the rock drilling equipment technical field, specifically is a drill rod for rock drill. BACKGROUND

[0002] As a core component, the drill rod directly affects the rock drilling efficiency and construction quality. Currently, most of the drill rods used in the market adopt traditional design. However, the existing drill rod has several significant problems in practical application, which seriously restricts the working efficiency of the rock drill and the drilling quality.

[0003] Firstly, the existing drill rod is prone to rod jamming phenomenon in the working process. The so-called rod jamming phenomenon refers to the phenomenon that the rock drilling tool (including a drill bit and several drill rods, the number of drill rods is related to the drilling depth) cannot continue to drill forward or retreat in the hole during the rock drilling process, resulting in the phenomenon that the tool cannot be pulled out of the hole. If the rod jamming phenomenon occurs frequently, it will affect the subsequent drilling and seriously affect the construction progress. This problem of rod jamming mainly comes from the following two aspects:

[0004] 1. Influence of rock fissure in the drilling path: during the drilling process, if a larger rock fissure is encountered, the drill rod will advance along the fissure direction with smaller stress. However, since the fissure direction is not necessarily the same as the advancing direction of the drill rod, the drill rod is inclined during the advancing process, the drill rod is deformed, and the surface of the drill rod is in close contact with the surface of the rock. When the drill rod continues to advance, the thrust of the rock drill and the chamfer design of the drill rod surface make the drill rod gradually deform and pass through the fissure. However, when the drill rod retreats, since the drill rod surface is stepped and lacks chamfer design, the drill rod is stuck in the rock fissure during the retreat process and cannot be withdrawn.

[0005] 2. Obstruction of pumice: in some mine vein rock passages with particularly broken rocks, pumice may be generated during the drilling process. Pumice generally refers to rock or ore blocks that have not yet separated from the rock mass or ore body but have the risk of falling. Therefore, when encountering such passages, the surrounding rock mass is usually prevented from collapsing during blasting by means of support and net hanging. When drilling in such passages, the drill rod first passes through the net and then drills into the rock. The pumice generated during the drilling process is blocked by the net and cannot fall, so the drill rod is squeezed by the pumice in the passage, making it impossible to withdraw. This rod jamming condition often occurs at the lower end of the drill rod, and there are very few drill rods that can be withdrawn.

[0006] Secondly, the existing drill rod has the problem of inaccurate positioning when deep hole drilling and inclined hole drilling. The opening depth of the rock drill is usually between 20 to 30 meters. Due to the small diameter of the drill rod, the head of the drill rod is prone to droop when drilling inclined holes, which affects the positioning accuracy of the drill rod. In addition, the connection of the existing drill rod mainly relies on threaded positioning. This connection method can only achieve axial positioning and lacks radial positioning structure, which causes the head of the drill rod to droop due to the gap between the male and female threads when drilling inclined holes, further affecting the positioning accuracy.

[0007] In summary, the existing drill rod for rock drill mainly faces the following three problems in actual application:

[0008] 1. Rod jamming: including drill rod jamming caused by rock fissures and drill rod exit blocked by floating stone, causing construction delay and drill rod loss.

[0009] 2. Inaccurate positioning of drill rod: during deep hole drilling and inclined hole drilling, the droop of the head of the drill rod affects the positioning accuracy and hole deviation rate of the drill hole.

[0010] 3. Unstable connection of drill rod: the existing drill rod connection method lacks radial positioning structure, which causes insufficient stability and coaxiality of the connected drill rod, further affecting the positioning accuracy during drilling. Practical new type content

[0011] The main purpose of the present application is to provide a drill rod for rock drill that avoids rod jamming caused by rock fissures and floating stone.

[0012] The drill rod for rock drill provided by the present application comprises a plurality of single-section drill rods connected by front and rear threads, a middle thread is arranged on the single-section drill rod, the thread direction of the middle thread is opposite to the thread direction of the head and tail of the single-section drill rod; and the two drill rods can be radially positioned when connected.

[0013] In an embodiment of the above drill rod, the single-section drill rod is made of high-strength alloy material.

[0014] In an embodiment of the above drill rod, the middle section of the single-section drill rod is provided with a middle thread opposite in spiral direction to the head and tail threads.

[0015] In an embodiment of the above drill rod, the head of the single-section drill rod is an external thread plug, and the tail is an internal thread sleeve.

[0016] In an embodiment of the above drill rod, the front side and the rear side of the head thread section and the front side and the rear side of the tail thread section are each provided with a radial positioning surface.

[0017] In one embodiment of the drill pipe, the pair of positioning surfaces are provided on the front side of the threaded section of the head and the front side of the threaded section of the tail, wherein the front side of the threaded section of the head is an inner concave surface and the front side of the threaded section of the tail is an outer convex surface.

[0018] In one embodiment of the drill pipe, the pair of positioning surfaces are provided on the rear side of the threaded section of the head and the rear side of the threaded section of the tail, wherein the rear side of the threaded section of the head is an outer convex surface and the rear side of the threaded section of the tail is an inner concave surface.

[0019] The drill pipe has the advantages that:

[0020] 1. The middle thread is added to the drill pipe body, and when repeatedly advancing and retreating, the thread can effectively enlarge the rock fissure, thereby preventing the drill pipe from being stuck at the fissure, ensuring that the drill pipe can smoothly advance or retreat, reducing drill pipe loss, and ensuring construction progress.

[0021] 2. The thread direction of the middle thread is opposite to the tightening direction of the drill pipe, and when encountering a floating stone, the thread on the surface of the drill pipe and the extruded rock generate a reverse thrust, thereby enhancing the retreating power of the drill pipe and reducing the risk of the drill pipe being stuck by the floating stone. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a structural schematic diagram of a single-section drill pipe according to an embodiment of the present application.

[0023] Figure 2 FIG. 2 is a cross-sectional structural schematic diagram of the single-section drill pipe. Figure 1

[0024] Figure 3 FIG. 3 is a structural schematic diagram of a multi-section drill pipe connection according to an embodiment of the present application.

[0025] Figure 4 FIG. 4 is a cross-sectional structural schematic diagram of the multi-section drill pipe. Figure 3

[0026] Figure 5 FIG. 5 is a state schematic diagram of the drill pipe in normal use according to an embodiment of the present application.

[0027] Figure 6 FIG. 6 is a state schematic diagram of the drill pipe when passing through a rock fissure according to an embodiment of the present application.

[0028] Figure 7 FIG. 7 is a state schematic diagram of the drill pipe when being hindered by a floating stone according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] ​​Clearly and completely describe the related technical solutions in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments, and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range of protection of the utility model.

[0030] In combination Figure 1 And Figure 2 It can be seen that the drill rod for rock drill disclosed in this embodiment comprises a plurality of single-section drill rods 1 connected through front and rear threads.

[0031] The single-section drill rod 1 is made of high-strength alloy material and has good tensile strength and bending resistance to adapt to the high-stress environment in the rock drilling process.

[0032] The middle section of the single-section drill rod 1 is provided with a middle thread 2 opposite in spiral direction to the head and tail threads.

[0033] By increasing the middle thread, the bending modulus of the drill rod is significantly improved, and the rigidity is stronger and less likely to bend. When the rock drill drills an inclined hole, the sag of the drill rod head is reduced, the accuracy of the drill rod positioning is ensured, and the drilling quality and efficiency are improved.

[0034] As shown in Figure 3 And Figure 4 The head 3 of the single-section drill rod 1 is an external thread plug, and the tail 4 is an internal thread sleeve, wherein a pair of positioning surfaces 5 are arranged on the front side of the threaded section of the head and the front side of the threaded section of the tail, wherein the front side of the threaded section of the head is an inner concave surface, and the front side of the threaded section of the tail is an outer convex surface, which are matched to limit and fix the single-section drill rods at the front and rear ends in the radial direction; a pair of positioning surfaces 6 are arranged on the rear side of the threaded section of the head and the rear side of the threaded section of the tail, wherein the rear side of the threaded section of the head is an outer convex surface, and the rear side of the threaded section of the tail is an inner concave surface.

[0035] By arranging the radial positioning surfaces, the radial positioning of the connected drill rods is realized, the two drill rods are prevented from moving radially after being connected, the stability and coaxiality of the drill rod connection are improved, and the sag of the drill rod head due to the gap between the male and female threads is avoided when the drill rod drills an inclined hole, so that the positioning accuracy in the drilling process is ensured.

[0036] The drill rod head and the tail are both left with enlarged positions as allowance clearance grooves.

[0037] As shown in Figure 5 During normal drilling, the drill rod does not contact the inner surface of the drilled hole except for the drill bit at the head.

[0038] As shown in Figure 6As shown, when the drill rod encounters a rock fissure, due to the middle thread added on the drill rod body, the thread can effectively grind and expand the rock fissure when repeatedly advancing and retreating, thereby preventing the drill rod from being stuck at the fissure, ensuring the drill rod to smoothly advance or retreat, reducing the drill rod loss, and guaranteeing the construction progress.

[0039] As shown, Figure 7 As shown, when the drill rod encounters a floating stone obstacle, due to the thread direction of the middle thread being opposite to the tightening direction of the drill rod, when encountering the floating stone, the reverse thrust generated by the thread on the surface of the drill rod and the extruded rock can enhance the retreating power of the drill rod, and reduce the risk of the drill rod being stuck by the floating stone.

[0040] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although a detailed description is made with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A drill rod for a rock drill, characterized in that: It comprises multiple single drill pipes connected by front and back threads, and the single drill pipes are provided with middle threads, the thread direction of which is opposite to that of the head and tail threads.

2. A drill rod for a rock drill as claimed in claim 1, characterized in that: The single drill pipe is made of high-strength alloy material.

3. A drill rod for a rock drill as claimed in claim 1, characterized in that: The middle section of the single drill pipe is provided with middle threads opposite to the thread direction of the head and tail threads.

4. A drill rod for a rock drill as claimed in claim 1, characterized in that: The head of the single drill pipe is an external thread plug, and the tail is an internal thread sleeve.

5. A drill rod for a rock drill as claimed in claim 4, characterized in that: The front and back sides of the head thread section and the front and back sides of the tail thread section are each provided with a radial positioning surface.

6. A drill rod for a rock drill as claimed in claim 5, characterized in that: The positioning surfaces provided on the front side of the head thread section and the front side of the tail thread section are a pair, wherein the front side of the head thread section is an inner concave surface, and the front side of the tail thread section is an outer convex surface.

7. A drill rod for a rock drill as claimed in claim 5, characterized in that: The positioning surfaces provided on the back side of the head thread section and the back side of the tail thread section are a pair, wherein the back side of the head thread section is an outer convex surface, and the back side of the tail thread section is an inner concave surface.

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