#Rock Drill

[dannyfariiia]

Rock Drill (reconstruction after the original) 1913/1974, Jacob Epstein (1880–1959) (reproduction of) and Ann Christopher (b.1947) and Ken Cook (b.1944), Birmingham Museums and Art Gallery

[if-you-fan-a-fire]

“Drill for Rock on Post Office Site,” Border Cities Star. May 11, 1932. Page 3. ---- PREPARATIONS for construction of the new Windsor Federal Building were advanced another step this morning, when this crew started drilling on the site to explore the rock strata underlying the area. A few days ago Hon. Hugh Stewart, Minister of Public Works, stated that there would be no delay in the erection of the building, in the construction of which much local employment will be provided.

[kellegrockdrillingtools]

The cause of rock drill impact piston damage

The hydraulic rock drill is a kind of rock drilling machine that uses high-pressure oil as the power to push the piston impact drilling tool and has an independent rotary mechanism. Because of its complex structure and high matching accuracy, once there is a problem with a component, it may affect the use of the rock drill. The impact piston is the main part of the impact part of the rock drill. As long as the rock drill starts to work, the impact piston will contact the shank adapter and cause a high-level reciprocating motion. Naturally, its damage rate is higher than other parts. Therefore, today, we mainly share the reasons for the damage to the impact piston of the rock drill.

1. Impact piston face damage

A. Mechanical damage

a. Local deformation occurs on the piston impact face.

There is a top hole for processing technology at the end of the shank adapter. The impact piston and the shank adapter collide with high frequency. Over time, plastic deformation occurs, showing a mastoid shape. Keep using the same manufacturer and specification shank adapter, it will not cause more damage to the impact piston.

b. The shank adapter material or heat treatment hardness is not suitable

If the shank adapter's hardness is low, it will be deformed during the impact process, resulting in an uneven striking surface, linear contact, and impact piston edge metal falling. If the shank adapter's hardness is too high, it will crack or its metal will fall during the impact process.

c. Running idly for a long time.

When the rock drill is driven with no load for a long time, the rebound shock wave will cause the impact piston and the shank adapter to generate a lot of heat, accompanied by the micro-crack.

d. The shank adapter is deflected or brought in small gravels.

After the shank adapter is deflected or brought in small gravels, the two contact surfaces are not parallel when the impact piston hits the shank adapter. Because the impact is line to surface instead of surface to surface, it is easy to cause the impact piston to drop small metal pieces.

B. Corrosion

If the rock drill is exposed to corrosive substances, the exposed surface of the piston will be corroded, and the metal surface will rust or fall off. The rock drill will produce high heat during high frequency and high-speed impact, and the high heat will accelerate the corrosion rate of the exposed surface of the piston.

2. The impact piston guide area is damaged

There are two most common failure phenomena in the guide bearing area: one is with the buffer piston contact surface stuck, and the other is the impact of the piston front section fracture.

Under the action of high-frequency shock waves, tiny thermal cracks will occur locally in the impact piston, and these small thermal cracks appear with more concentrated stress, and fatigue fracture will occur.

3. impact piston cavitation

If cavitation occurs on the surface of the front and rear driving areas of the piston, small pitted pits appear, and it does not affect the use but will affect the service life. If cavitation occurs on the impact surface of the end face of the impact piston, it will not affect the use. If the cavitation rough surface occurs in the sealing area, it will cause frequent sealing replacement and serious oil leakage.

The above content is the reason why the impact piston of the rock drill is damaged. To avoid the occurrence of the above phenomenon, we can choose the shank adapter produced by regular suppliers, regular maintenance, and prevent water from entering the rock drill. Only this can improve the efficiency and prolong the rock drill service life.

[jadvvigadoodlez]

the classes of all time ⛏️

[aulirwis]

Some old Bocchi arts before I went back to this site

[the-90s-music-colosseum]

The 90s MV Melee - round 1 match 63

TW for flashing imagery in the Aphex Twin video; also it is quite scary so be forewarned!

Voter-submitted propaganda:

Man-Size -

"LOVE HER LOVE HER LOVE HER LOVE HER LOVEEEEE HERRRRRRRRRR best music video of hers i think i love the black and white and when her earring falls off and the look on her face yay pj harvey :D"

Come To Daddy -

"It’s the scariest video ever!"

"SCARY!!! WHAT THE FUCK"

[decaffeinated-heads]

I'm tweaking, guys... These robots, guys......

[solarkindred]

Do you guys think Ingo had a gliscor because it vaguely reminded him chandelure? They both more or less have the same color palette…

[baeway954]

@baeway954

😂😂likeee

[rearranging-deck-chairs]

every time i watch this scene my heart gets a little more broken, the dramatic irony is so crushing, the way yaz already knows what we do what the doctor doesnt because theyve switched places entirely: they cant always fix it

we've seen the doctor through yaz's eyes, yaz's words, so many times and now for the briefest moment we get to see yaz through the doctor's eyes. all the pride and trust, an entire future laid out in front of them in "that was clever", and it only lasts like half a minute

[jonesyjonesyjonesy]

who said symmetrical was more attractive

[cybertron-after-dark]

Welcome to the stupidest rescue bots au.

They stick megs on rescue force sigma-17 instead of exiling him

Arguably, this is worse than exile.

[kellegrockdrillingtools]

Precautions for how to operate the rock drill

In the last article, We shared with you the preparations before starting up the rock drill. I believe everyone has an understanding of this. But the preparatory work is some little things before operation. If you want to operate rock drill well, it is necessary to focus on learning the precautions when the rock drill operation.

Precautions for rock drill operation

1. As starting to drill a hole, it should be rotated slowly, and after the depth of the hole reaches 10-15mm, it will gradually turn into a full power operation. In the process of rock drilling, according to the hole position design, the drill rod should advance straight along the centerline of the hole.

2. During rock drilling, shaft thrust should be tested reasonably. If the shaft thrust is too low, the machine will jump back, the vibration will increase, and the drilling efficiency will decrease. If the shaft thrust is too large, it will reduce the number of piston impacts and impact force, easy to premature wear parts, and slows down drilling speed.

3. When the rock drill is stuck, the shaft thrust should be reduced, and it can gradually become normal. If it doesn't work, turn off it immediately. First, use the wrench to turn the drill rod slowly, and then turn on the medium pressure to make the drill tool rotate slowly. It is forbidden to beat the drill rod.

4. Regularly observe the powder discharge situation. When the powder discharge is normal, the mud flows slowly from the orifice. On the contrary, to blow the hole strongly. If it is still invalid, check the flush hole of the drill bit and the shank adapter, and then check for the water tube, and replace the damaged parts.

5. Pay attention to observing the oil injection reserve and output, and adjust the oil amount. When the rock drill is operating without oil, it is easy to cause premature wear of parts. When the lubricating oil is too much, it will cause contamination of the working surface.

6. During operation, we should pay attention to the sound of the machine, observe its operation, find problems and deal with them in time.

7. Pay attention to the working state of the rock drilling tool, and replace it in time if there is an abnormality.

8. When operating the upward rock drill, pay attention to the air supply of the air leg to prevent the rock drill from swinging up and down and causing accidents. The support point of the air leg should be reliable. Do not hold the machine too tightly, and do not ride on the air leg to prevent injury to the machine and people.

9. Pay attention to the rock situation, avoid perforation along the bedding, joints, and fissures, prohibit breaking the residual rock, and observe at any time if there is the risk of the roof collapsing.

10. Use the hole-opening function effectively. It is accomplished with reduced impact pressure and fixed propulsive pressure. The thrust pressure should be as low as possible to facilitate drilling on very steep rock faces and to avoid bending the drill rod.

Correct use and maintenance of the rock drill can effectively prolong its service life, improve the economic benefits of the enterprise, and ensure the operator’s safety at the same time. Therefore, enterprises should provide professional training to the operators, and formulate operating specifications and related systems in combination with the machine instructions to ensure that the company can save costs and improve operating efficiency on the premise of ensuring personal safety.

[j-tillow]

[polyphonial-old]

a (very late) mailee boiling rock screenshot redraw for day 3: be gay do crime/day 7: free space of @atlasapphicweek !

[id: a screenshot redraw of a scene from 'the boiling rock' done in a digital semi-realistic painterly style. mai and ty lee are both shown kneeling in front of the camera, shown from the bust up. they are both facing three quarters to the center, with mai on the left and ty lee on the right. ty lee is drawn with light tan skin, slightly darker than in canon. they are both frowning at the camera. mai looks more angry, while ty lee looks more scared/upset. behind them are several guards, and off in the distance are a rocky cliff under a blue sky with fluffy white clouds. the artist's watermark is above mai's shoulder and it reads: 'olly' in white cursive. end id.]

[taylorhawkins]

too much for my own good - phil x & the drills ft. taylor hawkins