Improved rock drill

Abstract

An improved rock drill comprises a cylinder barrel, a rapping rod, a supporting sleeve, a vibration absorption pad and a fastening nut, the rapping rod is installed in the cylinder barrel, one end of the rapping rod is connected with a rotator, and the other end of the rapping rod is connected with a drill rod; a supporting sleeve is arranged on the peripheral face of the rapping rod in a sleeving mode and comprises a large ring sleeve and a small ring sleeve, a vibration absorption pad is arranged on the peripheral face of the small ring sleeve in a sleeving mode, a fastening nut is connected to the peripheral face of the front end of the cylinder barrel in a fastening mode, a center through hole of the fastening nut is arranged on the outer surface of the front end of the small ring sleeve in a sleeving mode, and the vibration absorption pad is limited between the supporting sleeve and the fastening nut. A gap is formed between the outer peripheral face of the large ring sleeve and the inner wall of the cylinder barrel, and the outer peripheral face of the vibration absorption pad is connected with the inner wall of the cylinder barrel in an interference fit mode. According to the rock drill, the phenomenon that dust enters the supporting sleeve from a gap between the vibration absorption pad and the cylinder barrel, so that the supporting sleeve is stuck can be greatly reduced; and meanwhile, the difficulty of disassembling the supporting sleeve due to dust jamming can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tapping machine tapping equipment, more specifically to an improved rock drill. Background Art

[0002] The rock drill is the main equipment for drilling the iron mouth of the blast furnace opening machine. During the use of the opening machine, when the rodless chamber of the opening machine rotating cylinder is filled with oil, the rotating arm is driven to reach the working position, so that the drill rod of the rock drill is tilted and aligned with the iron mouth, and the chain transmission device is driven by the feeding motor to make the opening machine trolley move forward and backward, and then the hydraulic motor of the rock drill drives the rotator to rotate the drill rod, and finally the impact mechanism of the rock drill drives the vibration rod to perform vibration work, so that the opening machine can open the iron mouth or withdraw the drill.

[0003] like Figure 1 As shown, the existing rock drill includes a cylinder 10, a rapping rod 20, a support sleeve 30, a vibration absorbing pad 40 and a fastening nut 50. The rapping rod 20 is installed in the cylinder 10. One end of the rapping rod 20 is connected to the rotator, and the other end is installed with a drill rod. A support sleeve 30 is sleeved on the outer circumference of the rapping rod 20. The support sleeve 30 includes a large ring sleeve 31 at the rear end and a small ring sleeve 32 at the front end. The outer circumference of the large ring sleeve 31 and the inner wall of the cylinder 10 are interference fit. A first sealing ring 33 is provided between the support sleeve 30 and the rapping rod 20, and a second sealing ring 34 is provided between the large ring sleeve 31 and the cylinder 10. A vibration-absorbing pad 40 is sleeved on the outer circumference of the small ring sleeve 32, and there is a distance between the outer circumference of the vibration-absorbing pad 40 and the inner wall of the cylinder 10. The fastening nut 50 is fastened to the front end outer circumference of the cylinder 10, and the center through hole of the fastening nut 50 is sleeved on the front end outer surface of the small ring sleeve 32 to limit the vibration-absorbing pad 40 between the support sleeve 40 and the fastening nut 50.

[0004] If the rapping rod of the rock drill breaks, the support sleeve must be removed before the rapping rod can be replaced. However, due to the high temperature and dust in the surrounding environment in front of the blast furnace, and the long-term operation of the equipment in a harsh environment, it is easy for dust particles on site to enter the interior of the rapping device from the gap between the central through hole of the fastening nut and the small ring sleeve of the support sleeve. Since the vibration-absorbing pad and the cylinder barrel are clearance-matched, dust can also enter the interior of the support sleeve through the gap at the top of the vibration-absorbing pad, causing the support sleeve to become stuck and extremely difficult to disassemble. It may even be necessary to replace the entire rock drill, which will affect the iron-making time in front of the furnace for a long time. To this end, we provide an improved rock drill. Utility Model Content

[0005] The utility model provides an improved rock drill, the main purpose of which is to overcome the disadvantages that dust enters into the interior of a support sleeve through the gap at the top of a vibration absorbing pad of the rock drill, causing the support sleeve to become stuck and extremely difficult to disassemble.

[0006] The utility model adopts the following technical solutions:

[0007] An improved rock drill comprises a cylinder, a rapping rod, a support sleeve, a vibration absorbing pad and a fastening nut, wherein the rapping rod is installed in the cylinder, one end of the rapping rod is connected to a rotator, and the other end is connected to a drill rod; a support sleeve is sleeved on the outer circumference of the rapping rod, the support sleeve comprises a large ring sleeve at the rear end and a small ring sleeve at the front end, a vibration absorbing pad is sleeved on the outer circumference of the small ring sleeve, the fastening nut is fastened to the outer circumference of the front end of the cylinder, and the central through hole of the fastening nut is sleeved on The front end outer surface of the small ring sleeve limits the vibration absorbing pad between the support sleeve and the fastening nut, and a plurality of first sealing rings are provided between the inner circumference of the large ring sleeve and the outer circumference of the rapping rod, and between the inner circumference of the small ring sleeve and the outer circumference of the rapping rod. There is a gap between the outer circumference of the large ring sleeve and the inner wall of the cylinder, and a plurality of second sealing rings tightly connected to the inner wall of the cylinder are also provided on the outer circumference of the large ring sleeve; the outer circumference of the vibration absorbing pad and the inner wall of the cylinder are connected by interference fit.

[0008] In a preferred embodiment, the gap size is between 0.5-1 mm.

[0009] In a preferred embodiment, the outer diameter of the vibration absorbing pad is 0.02-0.05mm larger than the corresponding inner diameter of the cylinder; the front end face and rear end face of the vibration absorbing pad are respectively against the inner end face of the central through hole of the fastening bolt and the front end side face of the large ring sleeve.

[0010] In a preferred embodiment, an enlarged circular ring is provided in the middle of the above-mentioned rapping rod, a limiting sleeve is correspondingly installed on the outer side wall of the enlarged circular ring, and an impact pad is correspondingly provided on the rear end side of the limiting sleeve and the large ring sleeve, and there is a distance between the impact pad and the enlarged circular ring.

[0011] From the above description of the structure of the utility model, it can be seen that compared with the prior art, the utility model has the following advantages: the utility model improves the connection between the vibration absorbing pad and the inner wall of the cylinder into an interference fit connection, which increases the sealing between the vibration absorbing pad and the cylinder, and can greatly reduce the occurrence of dust entering the support sleeve (between the large ring sleeve and the cylinder) from the gap between the vibration absorbing pad and the cylinder, causing the support sleeve to get stuck; at the same time, the large ring sleeve of the support sleeve and the inner wall of the cylinder are changed to a clearance fit to reduce the difficulty of disassembling the support sleeve when it is stuck due to dust. Therefore, the utility model can reduce the maintenance intensity and maintenance time of the rock drill without affecting the normal performance of the rock drill, thereby improving the operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of an existing rock drill.

[0013] Figure 2It is a cross-sectional view of the utility model. DETAILED DESCRIPTION

[0014] The specific implementation of the present invention is described below with reference to the accompanying drawings. In order to fully understand the present invention, many details are described below, but for those skilled in the art, the present invention can be implemented without these details. For well-known components, methods and processes, they are not described in detail below.

[0015] An improved rock drill, referring to Figure 2 , including a cylinder 10, a rapping rod 20, a support sleeve 30, a vibration absorbing pad 40, and a fastening nut 50, wherein the rapping rod 20 is installed in the cylinder 10, one end of the rapping rod 20 is connected to the rotator, and the other end is connected to the drill rod (not shown in the figure, the drill rod is specifically installed at the front end of the rapping rod). An enlarged circular ring 21 is provided in the middle of the rapping rod 20, and a limiting sleeve 22 is correspondingly installed on the outer side wall of the enlarged circular ring 21.

[0016] Reference Figure 2 , a support sleeve 30 is sleeved on the outer circumference of the rapping rod 20. The support sleeve 30 includes a large ring sleeve 31 at the rear end and a small ring sleeve 32 at the front end, and the large ring sleeve 31 and the small ring sleeve 32 are coaxially arranged and integrally formed. There is a gap between the outer circumference of the large ring sleeve 31 and the inner wall of the cylinder 10, and the gap size is between 0.5-1mm. A vibration absorbing pad 40 is sleeved on the outer circumference of the small ring sleeve 32, and the outer circumference of the vibration absorbing pad 40 is connected to the inner wall of the cylinder 10 by an interference fit, and the outer diameter of the vibration absorbing pad 40 is preferably 0.02-0.05mm larger than the corresponding inner diameter of the cylinder 10.

[0017] Reference Figure 2 The above-mentioned fastening nut 50 is fastened to the front end outer circumferential surface of the cylinder 10, and the central through hole of the fastening nut 50 is sleeved on the front end outer surface of the small ring sleeve 32, so that the vibration absorbing pad 40 is limited between the support sleeve 30 and the fastening nut 50; the front end face and the rear end face of the vibration absorbing pad 40 are respectively pressed against the inner end face of the central through hole of the fastening bolt 50 and the front end side face of the large ring sleeve 31.

[0018] Reference Figure 2 A plurality of first sealing rings 33 tightly connected to the inner wall of the cylinder are also provided on the outer circumference of the large ring sleeve 31; a second sealing ring 34 is provided between the inner circumference of the large ring sleeve 31 and the outer circumference of the rapping rod 20, and between the inner circumference of the small ring sleeve 32 and the outer circumference of the rapping rod 20.

[0019] Reference Figure 2The rear end side of the above-mentioned limiting sleeve 22 and the large ring sleeve 31 is correspondingly provided with an impact pad 23, and there is a gap between the impact pad 23 and the enlarged circular ring 21. The impact pad 23 can buffer the vibration impact of the vibration rod 20 and prevent the enlarged circular ring 21 of the vibration rod 20 from directly acting on the rear end side wall of the support sleeve 30.

[0020] The above is only a specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any non-substantial changes to the utility model using this concept shall be deemed as an infringement of the protection scope of the utility model.

Claims

1. An improved rock drill, comprising a cylinder, a rapping rod, a support sleeve, a vibration absorbing pad and a fastening nut, wherein the rapping rod is installed in the cylinder, one end of the rapping rod is connected to the rotator, and the other end is connected to the drill rod; a support sleeve is sleeved on the outer circumference of the rapping rod, and the support sleeve comprises a large ring sleeve at the rear end and a small ring sleeve at the front end, and a vibration absorbing pad is sleeved on the outer circumference of the small ring sleeve, and the fastening nut is tightly connected to the front end outer circumference of the cylinder, and the center through hole of the fastening nut is sleeved on the front end outer surface of the small ring sleeve to limit the vibration absorbing pad between the support sleeve and the fastening nut, and a plurality of first sealing rings are provided between the inner circumference of the large ring sleeve and the outer circumference of the rapping rod, and between the inner circumference of the small ring sleeve and the outer circumference of the rapping rod, characterized in that: There is a gap between the outer circumference of the large ring sleeve and the inner wall of the cylinder, and a plurality of second sealing rings tightly connected to the inner wall of the cylinder are provided on the outer circumference of the large ring sleeve; the outer circumference of the vibration absorbing pad and the inner wall of the cylinder are connected by interference fit.

2. An improved rock drill according to claim 1, characterized in that: The gap size is between 0.5-1 mm.

3. An improved rock drill according to claim 1, characterized in that: The outer diameter of the vibration absorbing pad is 0.02-0.05 mm larger than the corresponding inner diameter of the cylinder.

4. An improved rock drill as claimed in claim 1, characterized in that: The front end face and the rear end face of the vibration absorbing pad are respectively pressed against the inner end face of the central through hole of the fastening bolt and the front end side face of the large ring sleeve.

5. An improved rock drill as claimed in claim 1, characterized in that: An enlarged circular ring is provided in the middle of the rapping rod, a limiting sleeve is correspondingly installed on the outer side wall of the enlarged circular ring, and an impact pad is correspondingly provided on the rear end side of the limiting sleeve and the large ring sleeve, and there is a distance between the impact pad and the enlarged circular ring.

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