Electric hammer

IPC classes for russian patent Electric hammer (RU 2315181):

E21C37 - Other methods or devices for dislodging with or without loading (breaking-down by means inserted in slits E21C0027140000)

E02D7/02 - Placing by driving

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Electromagnetic hammer / 2295025

Electromagnetic hammer contains cylindrical magnetic duct body with coaxially mounted electromagnetic coils of the same name of direct and reverse drive, guiding pipe, ferromagnetic strikers, indicators of upper and lower positions of ferromagnetic striker, energy feeding and control system. Electromagnetic hammer consists of n elementary electromagnetic hammers, mounted successively one on top of another. Between ferromagnetic strikers of elementary electromagnetic hammers, non-magnetic steel spacer plates are inserted, each having length equal to drive value of ferromagnetic striker. Above the uppermost ferromagnetic striker and below lowermost ferromagnetic striker, hermetic hollows are formed. Electromagnetic hammer is provided with n load masses. Electromagnetic coils of the same name are connected between each other synchronously and serially and have divided hollow disks. Each electromagnetic coil of the same name together with part of body of elementary electromagnetic hammers is made of identical sections. Guiding pipe and magnetic ducts are made hollow. Guiding pipe of electromagnetic hammer has longitudinal recess, filled with non current-conductive material.

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Electric hammer comprises cylindrical body with three-phase winding located on inner body surface and tubular striking rotor slidably arranged in the body. The striking rotor is provided with excitation coils and short-circuited current-conducting rings located on outer striking rotor surface at poles thereof. The electric hammer has set-on weight installed on cylindrical surface thereof and connected to the surface and comprises striking rotor position sensors. Electric hammer has movable anvil block having case sealed to lower, inner part of cylindrical hammer body. The anvil block comprises damping chamber. High-pressure air chamber is defined by striking rotor cavities and cylindrical hammer body over the striking rotor and is connected to compressor by pipeline provided with check valve. Damping chamber of anvil block is communicated with ambient space through high-pressure safety valve, which in turn is linked to compressor through check valve. Lower part of anvil block has air-tightly installed cylindrical transmission power plate supported by anvil block case. Electric hammer also has power supply system, which controls three-phase winding of cylindrical body, and striking rotor excitation system.

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Device for driving casing strings / 2245964

FIELD: construction industry, particularly to drive heavy reinforced concrete and metal shelled concrete piles during ice-resistant fixed platform, including underwater one, construction.

SUBSTANCE: electric hammer comprises body with three-phase winding of linear induction motor stator adapted to receive reciprocating hollow striking armature installed therein in fluid-tight manner. The striking armature is monolithic in lower part and includes short-circuited current-conducting winding formed from outer surface thereof. Hammer comprises anvil block with damping means. Linear induction motor stator winding is installed in upper part of cylindrical electric hammer body, which is provided with tubular striking armature position sensors. Cylindrical body of electric hammer is installed inside cylindrical sealed shell so that lower and upper chambers are created. Chamber lengths are equal to cylindrical body length and striking armature travel correspondingly. The upper and lower chambers are freely connected with each other. Upper chamber is communicated with striking armature interior. Lower chamber has pipeline with check valve. Lower chamber and striking armature interiors are partly filled with heat-conductive and electrical insulation liquid. Remainder zones of lower chamber, striking armature interior and total upper chamber are filled with high-pressure heat-conductive gas. Lower chamber has protective safety valve. Vacuum chamber is created between lower monolithic striking armature part and anvil block. Damping means is installed in lower monolithic part of cylindrical electrical hammer body in fluid-tight manner and may reciprocate relatively the body. Cylindrical fluid-tight shell has additional weight. Short-circuited current-conducting winding of linear induction motor stator is linked to frequency-regulated power supply and control system.

EFFECT: increased operational reliability.

1 dwg

The invention relates to the construction industry and can be used for driving heavy metal pipe piles in the seabed during the construction of fixed offshore oil Legostayev platforms, including during underwater work at great depths or as element heavy duty impulsive seismic sources for seismic exploration for oil and gas.

Known electromelt [AC No. 497405 (USSR). Bull. "Opening. Of the invention. Industrial designs. Trademarks." 1975, No. 48. Auth.: The Ryashentsev N.P., Malov A.T., Feigin LS, Nosowitz AV, Cheremisin J.V., Torbeev AA], containing a cylindrical housing with magnetic poles and coaxially mounted electromagnetic coil backward and forward movement, a guide tube, a ferromagnetic head, the upper and lower position of the ferromagnetic striker system power and control.

The disadvantage of this design electromate is its low efficiency, a large amount of copper for the manufacture, resulting in high cost and low reliability due to the poor conditions of the heat sink from the power coils.

Closest to the proposed invention to the technical essence and the achieved result is electromelt, which is the prototype and comprising a housing with a three-phase winding of the article is the Torah linear induction motor, in which with the ability reciprocating movement of the hermetically installed monolithic hollow in the lower part of the anchor head with conductive squirrel-cage winding on its outer surface, the striker plate with shock.

The lack of such electromate is also low reliability due to the complexity of the design and bad cooling conditions anchor-striker and stator linear induction motor.

The objective of the invention is to increase the reliability of electromate.

This task is achieved by the fact that electromate, comprising a housing with a three-phase stator windings of the linear induction motor, in which, with the possibility of reciprocation hermetically installed monolithic hollow in the lower part of the anchor head with conductive squirrel-cage winding on its outer surface, the striker plate with damper winding stator linear induction motor is installed in the upper part is made of a cylindrical housing electromate, which is supplied by the transducer is made of a tubular anchor-striker, the cylindrical body electromate placed inside a cylindrical hermetic shell with the formation of the lower and upper chambers of the dimensions in length respectively equal to the length of the cylindrical body, electromate and x is DN anchor-striker the camera freely linked, and the upper chamber with the inner cavity of the anchor is brisk, and the lower chamber is equipped with a pipe with a check valve, while the lower chamber and the cavity of the anchor-striker partially filled with heat-conductive and comisariada liquid and the remaining part of the lower chamber, the cavity of the anchor-striker and all the upper chamber is filled with the heat-conducting gas of high pressure and lower the camera is fitted with a safety relief valve, between the bottom of the monolithic part of the anchor-striker and the striker plate is made vacuum chamber, the shock absorber is installed tightly in the bottom of a cylindrical monolithic body electromate with the possibility reciprocating movement with respect to it, and a cylindrical hermetic shell provided with an additional peregruzochny mass, and the three-phase stator windings of the linear induction motor of electromate connected to the system variable frequency power and control.

The drawing shows the proposed electromelt.

Electromelt consists of a cylindrical body 1 with three-phase stator windings of the linear induction motor 2 in the upper part of this building. Inside electromate with airtight seals and bearings 3 with the possibility of hermetic Shuttle moving a tubular 4, monolithic in the lower part 5 of the anchor head with conductive squirrel-cage winding 6. In the cylindrical housing of electromate installed sensors top 7 and bottom 8 of the provisions of the anchor is brisk. System variable frequency power supply (not shown) connected to the three phase input device 9 of the stator linear induction motor. A cylindrical housing electromate 1 is placed inside a cylindrical hermetic shell 10 having a top 11 and bottom 12 of the chamber. The lower chamber 12 and the cavity of the tubular anchor-striker 13 is partially filled with non-flammable and thermally comisariada liquid, and through the check valve 14 and the quick coupling 15 all three cavities filled with gas heat with high estimated working pressure of electromate. The lower cavity 12 provided with a safety relief valve 16. A cylindrical housing electromate together with a cylindrical hermetic shell 10 and anchor-striker mounted on the striker plate 17 is movable with the possibility of reciprocation, but tightly about it. Between the lower part of the anchor-striker 5 and the striker plate 17 is formed by the vacuum chamber 18. The striker plate through a shock-absorbing device, shown symbolically by the damper 19 is installed on hammering the pile 20. Cylindrical hermetic shell 10 electromate equipped with additional the additional peregruzochny weight 21, which can be installed on the top of the shell 10 and is rigidly connected to it. Power supply system and variable-frequency control is supplied with the remote control buttons "start", "stop" and the necessary regulatory bodies. Management can be performed using a microcontroller via radio or optical (these bodies not shown). The striker plate in the upper part is sealed guide 22 and slidably but tightly springs 23 is bonded with the sheath 10 electromate.

The device operates as follows.

Electromelt the striker plate 17 is set on a hammered the pile 20. Previously the lower part of the cylindrical hermetic shell electromate 10 and Luggage anchor-striker 13 is partially filled with coolant. By means of the quick connector 15 and the check valve 14 all three cameras 11, 12 and 13 are filled with heat-conductive and tokoizoliruyuschy gas of high pressure. All these cavities together with the vacuum chamber 18 perform the role of energy storage tubular anchor-striker when his platoon in the upper position. And this platoon is made by filing a voltage required frequency from the variable frequency drive for three phase input unit 9 stator linear induction motor with the coils 2. While in the air gap between the stator and the tubular is an anchor-the striker 4 is created running field with velocity V=2· τ·f, where τ pole division (m), f is the frequency of the current supplied to the stator (1/s). This speed is usually chosen equal to (0.5÷1) m/S. This traveling field in the tubular anchor-firing with squirrel-cage winding 6 is created tug and he begins to move in the upper position. With the passage of the lower end of the armature-striker sensor upper position of the tubular anchor-striker position 7, it gives a signal to disconnect the control system from the stator 1. On the tubular anchor-head start act efforts of compressed air in the chambers 11, 12, 13, the force of attraction of the vacuum chamber 18 and the force of the weight of the tubular anchor-striker. He intensively inhibited and accelerates in the opposite direction. Accelerated anchor the head to the initial velocity equal to (6÷6.5) m/s, strikes the striker plate 17, through which the shock absorber 19 transmits the impact energy of the pile 20. The mode of operation is calculated so that the striker plate is not out of the casing 1 electromate using hermetic guide 22. After striking the anchor head bounces off the striker plate, and the whole mass of the cylindrical housing electromate together with the counterweight 21 is lowered to the top of the striker plate. The signal from the sensor lower position 8 anchor-striker back on the control system and the anchor head again begins to move up and cycle electromate repeats. In addition to these sili, acting on the tubular anchor head when its acceleration down by reversing stator transducer, can be formed and additional pulling force of the engine 2. When the frequency control of linear induction motor electromate its efficiency is 75-80%that powerful hammers gives a fairly large heat losses in the anchor-firing, which, not having rotational motion, as in a conventional rotary electric motors, on the rotor where installed the fan blower has poor conditions for cooling. In the proposed design electromate almost impossible and the installation of the so-called forced cooling systems with a special "riders" - fans. Therefore, the proposed design electromate and entered the intensive gas-liquid cooled drive linear induction motor of 2.4. During periodic operation electromate as coolants can be used electrical oils, antifreeze or silicone fluids, in which the heat transfer coefficient vapor can be α=10500 W/m²*That, compared with the same ratio of the air - smooth surface α=5.6+4*V (V - velocity of the cooling air in m/s) gives manifold increase in the efficiency of haloperido and from the linear induction motor to the cylindrical housing 1 and the shell 10 electromate. And this cylindrical hermetic shell has a developed surface, which gives the possibility to radiate all of the allocated capacity electromate in the environment without the use of special measures airflow. Installation on the body electromate peregruzochny mass 21 even more improves its thermal characteristics and at the same time eliminates the recoil housing electromate during acceleration tubular anchor-striker in the lower direction.

Installation safety protective valve 16 provides protection electromate from possible excess pressure inside the housing when it is overheating.

In summary, the proposed electromelt has a fully sealed design concept with a positive pressure inside, which ensures its high reliability in operation and during storage in the open air, and the application of intensive gas-liquid cooling increases the reliability of electromate.

Electromelt, comprising a housing with a three-phase stator windings of the linear induction motor, in which, with the possibility of reciprocation hermetically installed monolithic hollow in the lower part of the anchor head with conductive squirrel-cage winding on its outer surface, the striker plate with the shock absorber, characterized in that the stator windings of the linear induction motor is recovered in the upper part is made of a cylindrical housing electromate, which is equipped with a transducer made of a tubular anchor-striker, the cylindrical body electromate placed inside a cylindrical hermetic shell with the formation of the lower and upper chambers of the dimensions in length respectively equal to the length of the cylindrical housing electromate and go anchor-striker, the camera freely linked, and the upper chamber with the inner cavity of the anchor is brisk, and the lower chamber is equipped with a pipe with a check valve, while the lower chamber and the cavity of the anchor-striker partially filled with heat-conductive and comisariada liquid, the remaining part of the lower chamber, the cavity of the anchor-striker and top all the chamber is filled with the heat-conducting gas of high pressure and lower the camera is fitted with a safety relief valve, between the bottom of the monolithic part of the anchor-striker and the striker plate is made vacuum chamber, the shock absorber is installed tightly in the bottom of a cylindrical monolithic body electromate with the possibility of reciprocating movement relative to it, and a cylindrical hermetic shell provided with an additional peregruzochny mass, and the three-phase stator windings of the linear induction motor of electromate connected to the system variable frequency power supply and control is.