Electric hammer

IPC classes for russian patent Electric hammer (RU 2282029):

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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Method for cast-in-place pile building in collapsible ground / 2266368

FIELD: mining and building, particularly to drive heavy metal or reinforced concrete piles.

SUBSTANCE: 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.

EFFECT: increased reliability, improved electric hammer actuation and operation.

1 dwg

The invention relates to the mining and construction industries and can be used for driving heavy metal pipe piles in the seabed during the construction of fixed offshore oil platforms or as element heavy duty impulsive seismic sources in seismic exploration works for oil and gas.

Closest to the proposed invention to the technical essence and the achieved result is electromelt, which was the prototype, which includes a housing with three-phase winding on the inside surface, in which the possibility of the hermetic movement has a hollow anchor-head with the exciting coils, the camera high air pressure, striker plate, a housing which is hermetically connected with the housing electromate, power supply system and control three-phase winding body and the excitation system anchor-striker [A.S. No. 58669].

The disadvantage of this device is the low reliability, poor conditions of start and bad handling.

The objective of the invention is to increase reliability, improve the starting conditions and controllability of electromate.

This task is achieved by the fact that electromelt, comprising a housing with a three-phase winding on the inside surface, which with the possibility sealed move set is Yong hollow anchor-head with the exciting coils, chamber high pressure air cavities formed by anchor-striker and body electromate over the anchor-striker, striker plate, a housing which is hermetically connected with the housing electromate, power supply system and control three-phase winding body and the excitation system anchor-striker housing electromate is cylindrical, and an anchor-head tubular, monolithic in the lower part of the short-circuited conductive rings in his poles on the outer surface, electromelt equipped with installed on its cylindrical housing and related peregruzochny mass sensors of the provisions of the anchor-striker, and the striker plate is made from a cushioning chamber in its lower part, when this camera high pressure air is connected by a pipe with non-return valve with the compressor, the body of the striker plate is hermetically connected with the lower, inner part of the cylindrical housing electromate and is mounted for movement relative to it, thus cushioning the camera striker plate is connected with the external environment via the relief valve high pressure, which, in turn, is connected by a compressor through a return valve, and the amortization camera striker plate in its lower part is supported on the body of the striker plate of the cylindrical gear of the power plate set is sealed relative to the body of the striker plate.

the and the drawing shows the proposed electromelt with the Executive authority in the form of a linear synchronous motor.

Electromelt consists of a cylindrical body 1 with a three-phase winding 2. In the cylindrical housing of electromate with the possibility sealed move a tubular 3, solid in the lower part 4 of the anchor head with the exciting coils 5 and closed conductive ring 6 in its poles. Coil excitation and short-circuited conductive ring the drawing shows one dashed line on the outer surface of the anchor-striker. In the chamber of high pressure 14 electromate entered the sensors of the upper 7 and lower 8 provisions anchors-striker. System variable frequency power supply (not shown) connected to the three phase input device 9. Power to the excitation coils 5 is supplied flexible wires from terminals 10. Adjustable power supply system of the exciting coils of the armature-striker in the drawing, also not shown. At the top of electromate shown peregruzochny mass 11 associated with the cylindrical body electromate. In electromelt entered the chamber 14 high air pressure, formed by the upper chamber 13 of the anchor-striker and chamber 14 of the cylindrical housing electromate. These cameras are connected by the pipe 15 through the check valve 16 to the compressor (compressor not shown). The lower part of the cylindrical housing electromate 17 through the cushioning strips the key 18 is installed on the body of the striker plate 19. The upper part of the striker plate is installed inside the lower part of the cylindrical housing electromate 17 with the possibility sealed move relative to it. Depreciation camera striker plate 20 is connected with the external environment via the relief of the high pressure valve 21, which, in turn, is connected to a compressor (not shown) through a check valve 22, and the amortization of the camera 20 in the lower part has a gear power plate 23 mounted is sealed relative to the body of the striker plate 19, leaning against his body and the object to be processed (the pile, oversized, radiant stove). The striker plate in the lower part has a guide 24 and pipe 25, and between the anchor-the striker 3 and the striker plate 19 is made vacuum chamber 26.

The device operates as follows. First electromelt the striker plate 19 of the lower part of the set transmission power plate 23 by means of the guide 24 on the driven pile. The compressor, through the check valve 22 and the pipe 25 in the cushioning chamber 20 is supplied with compressed air of high pressure. This increased pressure the whole electromelt rises above the pile on the stroke damping chamber 20. This operation is performed to exclude a fracture of the upper end of the pile during driving. Then from the compressor through the check valve 16 and pipe 15 into the chambers 13, 14 of the anchor-striker and is rhna part of the cylindrical housing electromate also served the increased air pressure. The pressure in the chambers 13 and 14 is selected such that it created stress on the cross section of the anchor-striker 3, less effort, equal to the weight of the cylindrical housing electromate and weight peregruzochny mass 11. Then served a three-phase AC voltage to three-phase input device 9, is produced by frequency induction starting synchronous motor. When the desired speed by anchor-busy 3 in accordance with the expression v_sync=2τf, where: τ pole division (m), f is the frequency of the current supplied to the stator 2 (Hz), served excitation DC on the terminals 10 in the pole armature winding-striker and he was given synchronous speed rises. With the approach of the armature-striker to the upper position sensor 7 at the same time turns off the excitation of the direct current terminals 10 and the power variable frequency from the three-phase terminals of the input unit 9. The anchor head 3 by gravity and the force of high pressure chambers 13, 14 is braked and then intensively accelerates in the opposite direction and strikes the striker plate 19, which acts on the driven pile sinking the camera 20, the power transmitting plate 23, which lies on the upper end of the pile at the moment of impact, integrating shock pulse in time, preventing it from destruction. The duration of the shock pulse and its amplitude are related by the equation: where t is the duration of the shock pulse (s), F - force shock pulse (N), m is the mass of the armature-striker, v is the initial speed of the armature is brisk. The strength and duration of impact are calculated from the values for pile driving and can get the value of the free motion of the striker plate 19 and the air pressure in the cushioning chamber 20. With the passage of the upper end of the anchor-striker through the sensor its lower position 8, after a time delay, to use the rebound of the armature-striker from piles are switched AC voltage at the stator 2 and is served excitation on the anchor-head with clamps 10. Use rebound effect facilitates the processes start electromate. Typically, the bounce rate is 15-20% of the shock speed, which is almost equal to the speed of the lifting anchor-firing pin in the upper position, which eliminates hard starting processes after each impact and significantly increases the efficiency of the workflow electromate. This synchronous speed of the anchor head is cocked up and the cycle repeats. This efficiency in the present invention reaches 0,9-0,95, almost like in a normal rotational synchronous machines against the efficiency of the prototype, not exceeding 0,6-0,65. Introduction depreciation camera improves reliability electromate and not destroys hammered pile, introduction korotkoe the other rings on the poles of the armature-striker improves its terms of start, and the introduction of position sensors greatly improves the manageability of electromate under all driving conditions, i.e. the task in the proposed design is fully executed.

Electromelt, comprising a housing with a three-phase winding on the inside surface, which with the possibility sealed move has a hollow anchor-head with the coils of the excitation chamber high pressure air cavities formed by anchor-striker and body electromate over the anchor-striker, striker plate, a housing which is hermetically connected with the housing electromate, power supply system and control of three-phase winding body and the excitation system anchor-striker, characterized in that the housing electromate is cylindrical, and an anchor-head tubular, monolithic bottom part with the short-circuited conductive rings in his poles on the outer surface, electromelt equipped with installed on its cylindrical housing and related peregruzochny mass sensors of the provisions of the anchor-striker, and the striker plate is made from a cushioning chamber in its lower part, the camera high pressure air is connected by a pipe with non-return valve with the compressor, the body of the striker plate is hermetically connected with the lower, inner part of the cylindrical housing electromate and installed in the possibility of movement relative to it, at the same time depreciation camera striker plate is connected with the external environment via the relief valve high pressure, which, in turn, is connected with the compressor through a return valve, and the amortization camera striker plate in its lower part is supported on the body of the striker plate of the cylindrical gear of the power plate set is sealed relative to the body of the striker plate.