Introduction to Impact Drill Encyclopedia
Impact drills rely on rotation and impact to work. Impact drills rely on rotation and impact to work. A single impact is very slight, but more than 40,000 impact frequencies per minute can produce a continuous force. Can be used for natural stone or concrete. When the impact drill is working, there is an adjustment knob at the drill chuck, which can be adjusted in two ways: ordinary hand drill and impact drill. However, the impact drill uses the gears on the inner shaft to jump to achieve the impact effect, but the impact force is far less than the electric hammer It is not suitable for drilling reinforced concrete. Introduction to Manual Impact Drill Impact drill: There are two types of impact mechanism for impact electric drills: canine and ball. The ball-type impact electric drill is composed of a moving disc, an impact drill, a fixed disc, and steel balls. The moving disk is connected to the main shaft through threads and has 12 steel balls; the fixed disk is fixed on the casing with pins and has 4 steel balls. Under the action of thrust, the 12 steel balls roll along the 4 steel balls. The hard alloy drill bit produces a rotary impact motion, which can drill holes in brittle materials such as bricks, blocks, and concrete. Take off the nails to make the fixed plate rotate with the follower plate without impact, and can be used as an ordinary electric drill. Use description Mainly suitable for impact drilling on concrete floors, walls, bricks, stones, wooden boards and multi-layer materials; in addition, it can also be used for drilling and tapping on wood, metal, ceramics and plastics and equipped with electronic speed control equipment Functions such as sequence/reverse. The impact drill motor voltage has two different voltages of 0V-230V and 0V-115V. It controls the clutch of the micro switch to obtain two different speeds of the motor speed. It is equipped with functions such as forward and reverse steering control mechanism, elastic screw and tapping. The main structure (1) Power switch. (2) Reverse limit switch. (3) Drill chuck. (4) Power supply voltage regulation and clutch control torque. (5) Change the voltage to realize the two-stage speed change mechanism. (6) Auxiliary handle, positioning ring, casing set screw, etc. (7) Forward and reverse steering control mechanism. (8) Gear set in the machine. (9) The case insulation holds the handshake. Relevant attachments (1) Spare parts for special electric drills. (2) Super strong drill chuck. (3) Special drill chuck key. (4) Adjustable auxiliary depth ruler of the fuselage. (5) Diamond drill bit. (6) Plug and drag the power cord. (7) Carbon brushes and terminals. (8) Auxiliary handle and scale adjustment limit torque. (9) Special disassembly and assembly and electrical testing tools, etc. Use and maintenance The impact electric drill is designed with double insulation, which is safe and reliable in operation. It does not need to use protective grounding (connect to zero) during use. It can be used with a single-phase two-pole plug. It can be used without wearing insulating gloves or wearing insulating shoes. In order to make the operation convenient, flexible and powerful, the impact electric drill generally has an auxiliary handle. Due to the double insulation of the impact drill, there is no ground (zero connection) protection, so special attention should be paid to protect the rubber sheathed cable. When you move the electric drill by hand, you must hold the handle of the electric drill. Rubber sheathed cables must not allow the wheels to roll and pedal; prevent rat bites. The correct way to use (1) Before operation, you must check whether the power supply is consistent with the conventional rated 220V voltage on the power tool, so as not to be mistakenly connected to the 380V power supply. (2) Before using the impact drill, please carefully check the body insulation protection, auxiliary handle and depth ruler adjustment, etc., whether the machine has loose screws. (3) Percussion drills must be loaded with alloy steel percussion drills or perforated universal drills in the allowable range between φ 6-25MM according to the material requirements. It is strictly forbidden to use drills beyond the scope. (4) The impact drill wire should be well protected. It is strictly forbidden to drag on the ground to prevent it from being damaged or cut, and it is not allowed to drag the wire into oily water to prevent the oily water from corroding the wire. (5) The power socket used for the impact drill must be equipped with a leakage switch device, and check the power cord for damage. If it is found that the impact drill has leakage, abnormal vibration, high heat or abnormal sound, it should stop working immediately and find an electrician to check in time repair. (6) When replacing the drill bit with the impact drill, a special wrench and a drill key should be used to prevent the impact drill from being hit with non-special tools. (7) When using an impact drill, remember that it is not possible to use excessive force or skew operation. Be sure to install a suitable drill bit and adjust the depth scale of the impact drill beforehand. The vertical and balanced operations must be applied with a uniform force, and it is not allowed to use oversized drill bits. (8) Proficiency in and operation of functions such as forward and reverse steering control mechanism, tightening screws and punching and tapping. maintenance (1) A professional electrician regularly replaces the carbon replacement brush of the impact drill and checks the spring pressure. (2) To ensure that the whole body of the impact drill is intact and clean and to remove dirt, to ensure smooth movement of the impact drill. (3) Regularly check whether the components of the hand drill are damaged by professionals, and replace those that are seriously damaged and can no longer be used. (4) Timely add the body screw fasteners lost on the fuselage during the operation. (5) Regularly check whether the bearings, gears and cooling blades of the transmission part are flexible and intact, and add lubricating oil to the rotating parts in time to extend the service life of the hand electric drill. (6) After use, return the electric drill to the tool storehouse in a safe place. Do not store overnight in a personal tool cabinet. Safe operation regulations (1) Attention must be paid to the work, not only to keep a clear head, but also to operate the electric tools rationally and tired, and it is strictly forbidden to operate the machine after drinking or taking stimulants or drugs. (2) The impact shell must be protected by a ground wire or a neutral wire. (3) The electric drill wire should be intact, it is strictly forbidden to drag, to prevent rolling and cutting. It is strictly forbidden to drag the wire into oily water to prevent the oily water from corroding the wire. (4) Check whether the insulation is intact and whether the switch is sensitive and reliable. (5) The clamping bit should be applied with proper force. It should be idling for a few minutes before use, and can only be used after rotating normally. (6) When drilling, the drill bit should be brought into contact with the workpiece slowly. Do not use excessive force to break the drill bit or burn out the motor. (7) Pay attention to the standing posture at work, and do not take it lightly. (8) When operating the machine, make sure to stand firmly and keep balance at all times. (9) Use an electric drill in a dry place. Gloves are strictly prohibited to prevent accidents when the drill bit is twisted. When using the electric drill in a humid place, you must stand on a rubber pad or dry wooden board to prevent electric shock. (10) If leakage, vibration, high temperature and overheating of the electric drill are found during use, the machine should be stopped immediately and cooled down before use. (11) When the electric drill has not stopped completely, the drill cannot be unloaded or replaced. When any abnormality occurs, no one else can disassemble it by themselves. (12) When power is off, rest or leave the work place, the power should be cut off immediately. (13) If the piezoelectric drill is used, the electric drill must be vertical, and the fixed end must be firm and reliable. (14) When replacing a new drill bit midway and drilling along the original hole, do not apply force suddenly to prevent accidents when the drill bit is broken. (15) When using a hammer drill to work in a humid place, it must be carried out on an insulating mat or a dry wooden board. Safety measures must be taken when ascending or used in hazardous areas such as explosion protection. (16) Wear proper work clothes, do not wear loose work clothes, and don't wear jewelry or long hair. It is strictly forbidden to wear gloves and cuffs without operating power tools. (17) It is not allowed to be placed randomly. When the work is completed, the electric drill and the insulation products should be placed in the designated place. Precautions Under normal circumstances, impact drills cannot be used as electric drills: First, the impact drills are difficult to grasp when in use, are prone to misoperation, and the holes are too large; Second, the drill is not sharp, so the holes are not neat, There are burrs or cracks; 3. Even if there is a switch on the top, try not to use it for drilling, unless you use a special drill bit, but because the speed of the electric drill is fast, it is easy to make the hole black and make the drill hot. Thus affecting the service life of the drill bit. Brief introduction of impact drills for pile driving: impact drills, bridges, culverts or tall buildings may require ground piles. Impact drills can be selected according to local geological conditions. Impact drills are a type of drilling rig. It is mainly used for drilling in hard geological and hard formations such as rocks. The drilling rig is divided into: rotary drilling, impact drilling, automobile drilling, forward circulation drilling, reverse circulation drilling. Construction process 1. Geological recovery, select the drilling location within the drilling range, and check the geology of the pile foundation to see if it is consistent with the design. It is still necessary for large-scale projects with large pile diameters and a large number of projects; For extra large projects, pile testing should also be carried out. 2. According to the site conditions, choose the construction method, whether to build an island or a cofferdam, whether a trestle is needed, etc., arrange the site reasonably, choose the drilling sequence reasonably, reduce the drilling rig turnover, and do not affect the adjacent holes; The nearest choice, the material generally does not have many restrictions, but the height of the island should be more than 2m higher than the highest historical water level in the construction area, which is very important. 3. According to the on-site geological conditions, choose the percussion drill reasonably. 8t or 10t depends on the geological situation. For the rock layer with higher hardness, it is recommended to choose a 10t drill; the diameter of the drill bit is 5cm smaller than the designed hole diameter. 4. Steel casing processing, according to the actual geological situation on site, the thickness of the steel plate is selected through lateral pressure calculation. Generally, the steel plate factory processes the coil into a section. Follow-up welding is performed during on-site drilling. The follow-up depth of the casing is generally considered to be located at the bottom. For hard rock formations, special attention should be paid to penetrate the quicksand layer. The steel guard tube is processed into a section of about 3m, and the cross brace is added during transportation. The first leg of the guard tube should be strengthened to prevent follow-up curling. 5. The impact drilling is actually the same as the construction technology of many underwater pile foundations. One of the most important key points is the mud wall protection. The mud content of the wall protection mud must be small. The concentration of the protective wall can be judged based on experience, and can also be measured experimentally. When the mud is too thick, the drilling speed is slow, and the mud is too light. The protective wall is easy to collapse. The mud production should also be determined according to the difficulty of the project. Some geology can be made with ordinary clay, and some geology should be based on the reasonable selection of mud mix ratio (test determination). In particular, the salinization in the coastal areas is very serious and needs special consideration. 6. The main points of drilling: It should be slow rather than fast at the beginning, because the rock layer around the blade edge of the protective tube needs to be compacted, and it needs to be repeatedly impacted and squeezed because this position is the easiest to pierce; verticality correction, after 2-3m Correct it immediately. The drilling is too deep and the deviation is too large. Only the backfill is repeated (in fact, the specifications are false, but one of the most important is that after the earthwork around the pile head is excavated, the naked eye must look horizontal and vertical). The rock layer is generally inclined and is perpendicular to the contact surface of the drilling rig. The position is repeatedly drilled by backfilling the pebbles until the rock layer is flat. How to judge, if the wire rope is washed down and the swing is strong, this may be the case. It is prone to jamming and the drill bit is tilted. Direction, hole tilt etc. The guard tube follows up in time, and the water head in the guard tube must be maintained. The mud index can be checked and controlled at any time, not sloppy drilling rigs, wire ropes, etc. at any time. It is difficult to drop the drill to judge the geological situation according to the drilling slag every day. After the geological histogram is marked and drilled to the design position, notify the supervisor to accept the acceptance and jointly determine the bottom of the hole Whether the geology is consistent with the design, the first pile foundation hole inspection should also notify the owner, design, survey, etc. 7. The whole process of drilling should be strictly controlled, but don’t worry when there is a fault. Reasonable choice of treatment method can generally be solved. Commonly found are: blade perforation, collapsed hole, deviated hole, cross hole, stuck drill, buried Drilling, hanging drilling, etc., precautions in advance will generally not occur, and the duty personnel's sense of responsibility is very important. 8. The remaining holes, the lowering of the steel cage, the pouring of the concrete back cover, etc. are more conventional, not much to write. However, the residue at the bottom of the hole, the precipitated sand, etc. must be cleaned up cyclically, otherwise it will bury large hidden dangers in the later project. When pouring concrete, under the impact of the back cover concrete, the residue will be mixed on the steel bar or wrapped in the concrete to cause pile foundation defects. When the load of the upper structure is transferred to the bottom of the pile, the structure should definitely produce uneven settlement of residue.