CN203627389U - Constant force output air floatation device with electromagnetism compensation - Google Patents

Abstract

A constant force output air floatation device with electromagnetism compensation comprises an output air cylinder and a magnetomotive device, wherein the output air cylinder comprises a piston, a piston rod, a cylinder barrel, an end cover, a cylinder barrel cover and an air inlet sleeve, and the air inlet sleeve comprises a first air inlet sleeve and a second air inlet sleeve; the magnetomotive device comprises a long-stroke moving coil and a vibration exciter iron core; the piston rod is connected with the piston which is sleeved with the cylinder barrel, the two ends of the cylinder barrel are respectively sleeved with the end cover and the cylinder barrel cover, the piston rod penetrates through the cylinder barrel cover, and the cylinder barrel is sleeved with the first air inlet sleeve and the second air inlet sleeve; the vibration exciter iron core is installed on the cylinder barrel through a fixing base, the long-stroke moving coil is fixedly connected with the piston rod through a connecting rod, and the vibration exciter iron core is sleeved with the long-stroke moving coil. An air pressure change value in the cylinder barrel can be measured through a differential pressure sensor and then is fed back to the magnetomotive device to compensate an output force value, high-accuracy constant force output can be achieved, the influence of air pipe disturbance does not exist, and air film forming is more stable.

Description

A kind of constant force output air-floating apparatus with electromagnetic compensation

Technical field

The utility model relates to constant force output unit.

Background technique

According to its different applied environments and application requirements, constant force output has various structures and implementation method.Dynamically constant force output refers to a constant power value is carried in the target workpiece of dynamic motion.

The simplest and conventional method that applies constant force by counterweight and target workpiece hanging, because counterbalance mass is constant, so it is constant to act on force retaining in target workpiece, but in the time that target workpiece is done acceleration or deceleration motion, counterweight can produce an additional force acting in target workpiece because of the impact of self inertia power, and the larger impact of counterbalance mass is larger, therefore this method is only applicable to the occasion of target workpiece low speed or uniform motion.Torque motor, hydraulic cylinder etc. are also often applied to constant force output field.As " hydraulic pressure installation of constant force output " that number of patent application is 201120495617.7 just announced a kind of hydraulic pressure installation of exporting accurate power value by PLC controller, electromagnetic proportional valve, pressure transducer, but in this device, pressure transducer is arranged on the output terminal of hydraulic pressure installation, pressure transducer is kept in motion, and therefore can affect the validity of measured value.Air supporting without friction cylinder realizing that ultraprecise constant force output is controlled, be used widely in minute-pressure action control, between piston and cylinder barrel, there is not frictional force by gas lubrication, therefore act on air pressure size in cross-section area and the cylinder barrel of power on piston and piston relevant; Number of patent application be 201110072339.9 " with air-bearing without friction cylinder " announced a kind of air supporting without friction cylinder, owing to connecting admission line on its piston rod, can to output power value exert an influence; Moreover the speed of response of gas is slow, the Volume Changes that the motion of cylinder barrel inner carrier produces can cause air pressure transition, causes the fluctuation of output constant force, therefore, air supporting is generally used for realizing action output without friction cylinder, and constant voltage control ratio is more difficult, is difficult to guarantee the constant of ouput force value.

Summary of the invention

For ouput force value in existing constant force output unit be difficult to keep constant, sensor measurement not precisely, the problem such as constant force output accuracy is not high, the utility model provide a kind of ouput force value accurately, good stability, constant force output air-floating apparatus with electromagnetic compensation.

The utility model solves the technological scheme that its technical problem adopts:

A constant force output air-floating apparatus with electromagnetic compensation, comprises output cylinder, Magnetomotive device; Described output cylinder comprises piston, piston rod, cylinder barrel, end cap, cylinder barrel lid, air inlet cover, and wherein said air inlet cover comprises the first air inlet cover and the second air inlet cover; Described Magnetomotive device comprises long range moving coil, vibration exciter iron core.

Described piston rod connects piston, described piston sleeve be contained in cylinder barrel and and cylinder barrel wall between have minimum gap, described cylinder barrel two ends are set with end cap and cylinder barrel lid, described piston rod through cylinder barrel lid and and cylinder barrel lid inwall between have minimum gap; Described the first air inlet cover is sleeved on cylinder barrel, and described the second air inlet cover is sleeved on cylinder barrel and covers.

Described vibration exciter iron core is arranged on cylinder barrel by fixed base, and described long range moving coil is affixed by connecting rod and piston rod, and described long range moving coil is sleeved on vibration exciter iron core.

Between described the first air inlet cover and cylinder barrel, leave gap and form the first air storing cavity, described the first air inlet puts and is provided with the first suction port, and described the first suction port communicates with the first air storing cavity.Between described the second air inlet cover and cylinder barrel lid, leave gap and form the second air storing cavity, described the second air inlet puts and is provided with the second suction port, and described the second suction port communicates with the second air storing cavity.

Described cylinder barrel first throttle orifice radially that is uniformly distributed along the circumference, described first radially throttle orifice communicate with the first air storing cavity, described first radially throttle orifice in axial direction have two groups at least, described first radially installs orifice plug in throttle orifice.

Described cylinder barrel covers second throttle orifice radially that is uniformly distributed along the circumference, described second radially throttle orifice communicate with the second air storing cavity, described second radially throttle orifice in axial direction have two groups at least, described second radially installs orifice plug in throttle orifice.

Described piston is provided with the first pressure relief groove, the first groove on axial blind hole, outside piston cylinder that described the first pressure relief groove comprises piston center, the first radial direction through hole in the first groove; Described the first radial direction through hole communicates with axial blind hole, and described the first groove has two groups and be positioned at the two ends of piston at least.

Described piston rod center has axial hole and forms and unload pore, described in unload pore and communicate with the axial blind hole at piston center.

Described cylinder barrel covers and is provided with the second pressure relief groove, and described the second pressure relief groove comprises the second radial direction through hole in the second groove, the second groove on cylinder barrel lid inwall; Described the second radial direction through hole communicates with ambient atmosphere.

Described end cap is provided with inlet hole, and described cylinder barrel covers and is provided with air outlet hole; Described inlet hole connects differential pressure transducer and large gas holder by tracheae, stores pressure-sustaining gas in described large gas holder.

Between described end cap and cylinder barrel, between cylinder barrel and the first air inlet cover, between cylinder barrel lid and cylinder barrel, all adopt O type circle to seal between cylinder barrel lid and the second air inlet cover.

Further, described piston also can connect double piston-rod formation double-acting cylinder.

Mentality of designing of the present utility model shows:

Because piston cross-section area is certain, thus constant as long as assurance enters into the gas pressure of inner cavity of cylinder, can guarantee that the power value of output is constant.But piston moves and causes that cavity volume changes, and gas compensation exists certain hysteresis quality, thereby causes air pressure transition, causes Output force wave.Therefore, the utility model has increased Magnetomotive device and gas holder; Utilize gas holder to store constant pressure, be equivalent to increase the volume of cylinder barrel air-inlet cavity, improved the stability of constant force output; In the time that output cylinder internal air pressure changes because volume-variation produces, can measure cylinder barrel internal air pressure changing value by differential pressure transducer, then feed back to Magnetomotive device ouput force value is compensated, further improve the precision of constant force output.Magnetomotive device is made up of long range moving coil and vibration exciter iron core, long range moving coil is affixed by connecting rod and piston rod, can be piston rod non-contacting electromagnetic force is provided, and passes through electromagnetic compensation, can also suppress the impact of inertial force, realize constant force output accurate, at a high speed.

Cylinder barrel and cylinder barrel cover and are respectively equipped with radially throttle orifice, radially throttle orifice overcoat has air inlet cover, the suction port that pressurized gas put from air inlet enters, by throttle orifice radially between piston and cylinder barrel, between piston rod and cylinder barrel lid, form air film, for piston provides support and lubricates; Piston is not subject to the impact of air inlet pipeline, and intake method is simple, good stability.

Piston and cylinder barrel cover and are equipped with pressure relief groove, and pressure relief groove communicates with ambient atmosphere, in the film formed gap of gas, form atmospheric area, make to have pressure gradient in gap, and the formation that air film is stablized in promotion, bearing capacity is good; Radially throttle orifice on cylinder barrel is positioned at the medium position of cylinder barrel, and piston has certain length, in piston moving process, can guarantee that radially throttle orifice on cylinder barrel is all the time in its range of movement;

The utility model has the advantages that: without tracheae disturbing influence, air film form more stable, can realize high precision constant force output.

Accompanying drawing explanation

Fig. 1 is a kind of constant force output air-floating apparatus schematic diagram with electromagnetic compensation

Fig. 2 is vibration exciter iron core schematic diagram

Embodiment

In conjunction with Fig. 1～2, a kind of constant force output air-floating apparatus with electromagnetic compensation, comprises output cylinder, Magnetomotive device; Output cylinder comprises piston 5, piston rod 17, cylinder barrel 4, end cap 1, cylinder barrel lid 12, air inlet cover; Described Magnetomotive device comprises long range moving coil 26, vibration exciter iron core 25.

Piston 5 be sleeved in cylinder barrel 4 and and cylinder barrel wall between have minimum gap, cylinder barrel 4 two ends are set with end cap 1 and cylinder barrel lid 12, piston rod 17 connects piston 5, piston rod 17 through cylinder barrel lid 12 and and cylinder barrel lid inwall between have minimum gap; End cap 1 is provided with inlet hole 2, and cylinder barrel lid 12 is provided with air outlet hole 11; Inlet hole 2 connects differential pressure transducer and large gas holder by tracheae, in large gas holder, stores pressure-sustaining gas.

Vibration exciter iron core 25 has two and be installed in parallel on cylinder barrel 4 by fixed base 24, and long range moving coil 26 has two and affixed by connecting rod 27 and piston rod 17, and long range moving coil 26 is sleeved on vibration exciter iron core 25.

Air inlet cover comprises the first air inlet cover 7 and the second air inlet cover 14, the first air inlet cover 7 is sleeved on cylinder barrel 4, the second air inlet cover 14 is sleeved on cylinder barrel lid 12, between the first air inlet cover 7 and cylinder barrel 4, leave gap and form the first air storing cavity 22, between the second air inlet cover and cylinder barrel lid, leave gap and form the second air storing cavity 20, the first air inlet cover 7 is provided with the first suction port 8, the first suction port 8 communicates 22 with the first air storing cavity, the second air inlet cover 14 is provided with the second suction port 16, the second suction ports 16 and communicates with the second air storing cavity 20.

Cylinder barrel 4 be uniformly distributed along the circumference first radially throttle orifice 9, the first radially throttle orifice 9 in axial direction have two groups, first radially throttle orifice 9 communicate with the first air storing cavity 22; Cylinder barrel lid 12 be uniformly distributed along the circumference second radially throttle orifice 15, the second radially throttle orifice 15 in axial direction have two groups, second radially throttle orifice 15 communicate with the second air storing cavity 20; The first radially interior orifice plug that is all provided with of throttle orifice 15 of throttle orifice 9 and second radially.

Piston is provided with the first pressure relief groove, the first groove 10 on axial blind hole 23, outside piston cylinder that the first pressure relief groove comprises piston center, the first radial direction through hole 6 in the first groove 10; The first radial direction through hole 6 communicates with axial blind hole 23, and the first groove 10 has two groups and be positioned at the two ends of piston; Piston rod 17 centers have axial hole formation and unload pore 18, unload pore 18 and communicate with the axial blind hole 23 at piston center; Cylinder barrel lid 12 is provided with the second pressure relief groove, and the second pressure relief groove comprises the second radial direction through hole 13 in the second groove 21, the second groove on cylinder barrel lid inwall; The second radial direction through hole 13 communicates with ambient atmosphere.

Between end cap 1 and cylinder barrel 4, between cylinder barrel 4 and the first air inlet cover 7, between cylinder barrel lid 12 and cylinder barrel 4, cylinder barrel lid 12 and the second air inlet all adopt O type circle 3 to seal between overlapping 14.

Further, piston 5 also can connect double piston-rod formation double-acting cylinder.

Claims (1)

1. the output of the constant force with an electromagnetic compensation air-floating apparatus, is characterized in that: comprise output cylinder, Magnetomotive device; Described output cylinder comprises piston, piston rod, cylinder barrel, end cap, cylinder barrel lid, air inlet cover, and wherein said air inlet cover comprises the first air inlet cover and the second air inlet cover; Described Magnetomotive device comprises long range moving coil, vibration exciter iron core;

Described piston rod connects piston, described piston sleeve be contained in cylinder barrel and and cylinder barrel wall between have minimum gap, described cylinder barrel two ends are set with end cap and cylinder barrel lid, described piston rod through cylinder barrel lid and and cylinder barrel lid inwall between have minimum gap; Described the first air inlet cover is sleeved on cylinder barrel, and described the second air inlet cover is sleeved on cylinder barrel and covers;

Described vibration exciter iron core is arranged on cylinder barrel by fixed base, and described long range moving coil is affixed by connecting rod and piston rod, and described long range moving coil is sleeved on vibration exciter iron core;

Between described the first air inlet cover and cylinder barrel, leave gap and form the first air storing cavity, described the first air inlet puts and is provided with the first suction port, and described the first suction port communicates with the first air storing cavity; Between described the second air inlet cover and cylinder barrel lid, leave gap and form the second air storing cavity, described the second air inlet puts and is provided with the second suction port, and described the second suction port communicates with the second air storing cavity;

Described cylinder barrel first throttle orifice radially that is uniformly distributed along the circumference, described first radially throttle orifice communicate with the first air storing cavity, described first radially throttle orifice in axial direction have two groups at least, described first radially installs orifice plug in throttle orifice;

Described cylinder barrel covers second throttle orifice radially that is uniformly distributed along the circumference, described second radially throttle orifice communicate with the second air storing cavity, described second radially throttle orifice in axial direction have two groups at least, described second radially installs orifice plug in throttle orifice;

Described piston is provided with the first pressure relief groove, the first groove on axial blind hole, outside piston cylinder that described the first pressure relief groove comprises piston center, the first radial direction through hole in the first groove; Described the first radial direction through hole communicates with axial blind hole, and described the first groove has two groups and be positioned at the two ends of piston at least;

Described piston rod center has axial hole and forms and unload pore, described in unload pore and communicate with the axial blind hole at piston center;

Described cylinder barrel covers and is provided with the second pressure relief groove, and described the second pressure relief groove comprises the second radial direction through hole in the second groove, the second groove on cylinder barrel lid inwall; Described the second radial direction through hole communicates with ambient atmosphere;

Described end cap is provided with inlet hole, and described cylinder barrel covers and is provided with air outlet hole; Described inlet hole connects differential pressure transducer and large gas holder by tracheae, stores pressure-sustaining gas in described large gas holder.

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