Electromagnetic shock mechanism
The invention relates to the field of mining and road-building machinery, namely the electromagnetic shock mechanisms, and can be used for the destruction of rocks, branches sludge formations in the ladle for casting metals, the activation of the working bodies of mining machines, etc., the Mechanism includes a housing made of a ferromagnetic material, the anchor-drummer, consisting of two parts, one of which is ferromagnetic, and the second made in the form of a non-magnetic conductive ring, an induction coil and a source of pulse current. He also has a casing with a cover installed on it the exhaust valve, rear head on the end of which is equipped with valve box with suction valve. At anchor-the drummer from the outside is made of longitudinal grooves associated with axial holes in the non-magnetic conductive ring, the front end face of which is secured the discharge valve. From the outside of the case is made of longitudinal grooves forming with the casing closed channels, closed with the rear end cap. The invention provides improved reliability electromagnetic shock mechanism. 4 Il. The invention relates to the field is used for breaking rocks, separation sludge formations in the ladle for casting metals, the activation of the working bodies and mining machines etc.A device for formation of wells in the ground (Electromagnetic pulse system. Ed. by N. P. Ryashentsev.-Novosibirsk. Novosibirsk: IGD so an SSSR, 1989, S. 173), comprising a housing with an anvil actuator with solenoid coils and anchor drummer made of composite length, with alternating links of ferromagnetic and non-magnetic material.This solution has the disadvantage of low efficiency and, accordingly, reduced the energy of a single shock and high heat when working with frequencies above 4 Hz (ed. mon. THE USSR 386092, E 02 F 5/18, 1973).The closest solution to the technical nature of the proposed technical solution is the electromagnetic shock mechanism (patent of the Russian Federation, 2096610, CL 6 E 21 3/16, E 02 F 5/18, 1994), which contains the building hosting the induction coil and the anchor-drummer. In front of the anchor-drummer are rings of non-magnetic conductive material.The disadvantage of this mechanism is the rapid heating of the electromagnetic system when operating at frequencies above 4 Hz, which leads to overheating of the mechanism, snezenek associated with the because of the active resistance of the induction coil and the conductive rings and the magnetic resistance of the hull and anchor-drummer part of the electromagnetic energy is converted into heat, which leads to overheating of the mechanism as a whole.The purpose of the invention to increase the heating time electromagnetic system to acceptable limits and, accordingly, the increase of ROS and reliability of the electromagnetic shock mechanism.This goal is achieved by the fact that in the known device consisting of a body, made of a ferromagnetic material, the anchor-pin, induction coil, the back of the head and source of pulse current, the anchor-drummer made of two parts:ferromagnetic and non-magnetic conductive ring. While at anchor-the drummer from the outside, coaxially with the axial holes in the conductive ring is made of longitudinal grooves, the front end face of the armature-drummer fixed discharge valve; at the end of the back head mounted valve box with suction valve. From the outside of the case is made of longitudinal grooves forming with the casing closed channels, closed with the rear end cap installed on it the exhaust valve.This is to and the conductive ring and the outer part of the body. In the process of circulation of air takes away the heat that is released when the mechanism in the induction coil, the conductive ring and the magnetic core.On the accompanying drawings is shown in Fig. 1 - General view of the electromagnetic shock mechanism, Fig. 2 is a section along a - a of Fig. 3 - leader II, Fig. 4 - callout I.The mechanism includes a housing 1 (Fig. 1) in which the induction coil 2. In case 1 set front 3 and rear 4 poles. In front of the anchor-striker 5 is a ring 6 of a nonmagnetic conductive material. From the rear side of the housing 1 is closed by the rear head 7 with the sleeve 8. At the front of the housing 1 a spacer sleeve 9 with the sleeve 10. Sleeve 8 and 10 serve as guides for anchor-drummer 5. In the front head 11 mounted on the housing 1, a work tool 12 that is fixed by a stopper 13. At anchor-the striker 5 is made of longitudinal grooves 14 (Fig. 2), which are interfaced with axial holes 15 in the conductive ring 6. The front end face of this ring is fixed discharge valve 16, which is tightened thereto by a spring 17 (Fig. 3). At the end of the rear head 7 is installed valve box with suction valve 18 (Fig. 4). On the upper end of the anchor-drummer 5 gskai 23 has mounted on it the exhaust valve 24. Between the rear head 7 and the cover 23 has a hollow cylinder 25. The power to the induction coil 2 is supplied from the source pulse current 26.The mechanism works as follows.From the source of pulse current 26 in the induction coil 2 is supplied pulse current. In the coil and in the magnetic circuit formed by the housing 1, the poles 3 and 4, the anchor-drummer 5, there is an alternating electromagnetic field, which is at the intersection of the conductive ring 6 excites in him the induced EMF, which is proportional to the rate of change of magnetic flux. In the ring 6 under the action of EMF is excited by electric current, and in accordance with the law of Lorentz occurs, the force acting on the anchor-drummer 5, pushing it in the direction of the working tool 12. Simultaneously to the ferromagnetic portion of the anchor-drummer 5 force Maxwell, which upon reduction of the working gap D increases significantly, and continues to pull the upper ferromagnetic part of the anchor-drummer 5 in the coil 2 and to inform him of the additional kinetic energy. At the end of the stroke of the lower - working part of the striker 5 hits on the working tool 12, is constantly pressed against the erodible surface. Return anchor-udarnikom anchor-drummer. Next working cycle is repeated.When working stroke of the armature-drummer 1 down volume of the chamber 27 increases, the pressure in it drops and opens the suction valve 18 and the discharge valve 16 is closed, so the air from the cavity of the cylinder 25 through the intake valve 18 and the channel 28 into the chamber 27 (Fig. 4). Simultaneously, air from the cavity 29 through the radial channels 30 and 31 flows into the channels 32 of the housing 1. Further, passing through the annular space between the casing 22 and the cylinder 25 through the channels 33 and 34 through the exhaust valve 24, is discharged into the atmosphere. At idle anchor-drummer 1 up the intake valve 18 is closed and the discharge valve 16 under the action of the increased pressure created in the chamber 27 opens. The air from the chamber 27 through the channels 14 and the holes 35, the valve 18 and the radial channel 36 (Fig. 3) enters the cavity 29. As the volume of the chamber 27 exceeds the volume of the cavity 29, the excess air coming from the chamber 27 into the cavity 29 through the channels 32, 33, 34 and through the exhaust valve 24 is displaced into the atmosphere. This ensures that the air circulation inside the percussive mechanism through the anchor-the drummer and the conductive ring and the outer part of the body. In the process of circulation of air takes away the heat of the ical solution allows, in comparison with the prototype to increase the heating time electromagnetic system within permissible limits, accordingly, to increase the allowable duration of activation of the mechanism and, as a result, significantly increase the reliability of the electromagnetic shock mechanism.
ClaimsElectromagnetic percussion mechanism comprising a casing made of a ferromagnetic material, the anchor-drummer, consisting of two parts, one of which is ferromagnetic, and the second made in the form of a non-magnetic conductive ring, an induction coil and a source of pulse current, characterized in that it is provided with a cover with a lid installed on it the exhaust valve, rear head on the end of which is equipped with valve box with suction valve, while at anchor-the drummer from the outside is made of longitudinal grooves associated with axial holes in the non-magnetic conductive ring, the front end face of which is secured the discharge valve, and from the outside of the case is made of longitudinal grooves forming with the casing closed channels, closed with the rear end cap.
FIELD: mining industry; civil engineering.
SUBSTANCE: invention can be used in rippers of gas-dynamic action for loosening firm and frozen soils. Proposed gas-dynamic ripper has hollow rod housing installed coaxially and connected mechanically with housing of screw head with exhaust holes, vertically installed gui9de shaft for fastening on frame of base machine on which bracket is installed for longitudinal displacement with fitted-on bushings for connection with shaft, cocks to control delivery of compressed gas and pipelines to deliver compressed gas from supply source to gas distributor made in form of pneumatic accumulator with hollow shank secured on hollow rod housing, and ring housing with three ring channels in its wall rigidly connected with bracket, coaxially installed inner and outer supply pipes, exhaust control valve installed in screw head installed for limited axial displacement inside housing of screw head and interacting with seat for communicating ring clearance between seat and inner supply pipe with exhaust holes in housing of screw head are provided with control space and inner supply pipe arranged in control space, spring to press valve to seat, and piston for forced displacement of gas installed inside hollow rod housing for limited axial displacement. One of ring channels in wall of ring housing communicates through cock with pipeline to deliver compressed gas from supply source, and it communicates through radial channels made in ring housing through inner supply pipe with valve control space to communicate ring clearance between seat and inner supply pipe with exhaust holes in screw head housing. Space of pneumatic accumulator communicates with atmosphere and with supply source through compressed gas supply control cock, pipelines, ring channel with radial channels in wall of ring housing, radial channels and inner space in shank. Ring clearance between seat and inner supply pipe communicates with supply source through compressed gas supply cock, pipelines, ring channel with radial channels in wall of ring housing and outer supply pipe. Housing of pneumatic accumulator is made in form of hollow cylinder with lower and upper flanged parts provided with concentric holes for coaxial fastening of upper flanged part of pneumatic accumulator to flanged part of hollow shank, for coaxial fastening of lower flanged part of pneumatic accumulator to flanged part of hollow rod housing made at a distance from its upper end face equal to height of housing of pneumatic accumulator. Seat installed on upper end face of hollow rod housing for limiting upwards movement of forced gas displacement piston. Spring for limiting downward movement of forced gas displacement piston is installed on upper end face of seat to limit upward movement exhaust control valve. Outer supply pipe is installed in central hole of forced gas displacement piston.
EFFECT: increased efficiency.