CN203627388U - Bidirectional constant force outputting air floatation device - Google Patents

Abstract

The utility model provides a bidirectional constant force outputting air floatation device which comprises a cylinder barrel, a connection rod piston, end covers, output shafts and limiting blocks. The piston is arranged in the cylinder barrel in a sleeved mode. The two ends of the cylinder barrel are sealed through the end covers. The middle of the cylinder barrel is provided with two axial grooves which are symmetric in an up-and-down mode. The two ends of each axial groove are provided with the limiting blocks. The connection rod piston comprises a first piston with two protruding ends, a second piston with two protruding ends and a middle piston rod. Extremely small gaps are reserved between the first piston and the cylinder barrel and between the second piston and the cylinder barrel respectively. The middle of the piston rod is connected with the output shaft. The output shaft penetrates through the axial grooves in the cylinder barrel. The two ends of the cylinder barrel are provided with a first gas inlet and a second gas inlet respectively. The first gas inlet and the second gas inlet are connected with a proportion valve and a gas storing tank respectively through gas pipes. The cylinder barrel and the piston are integrally designed, radial throttling holes are evenly distributed in the connection rod piston and the structure and the gas supplying manner are simple. The bearing capacity is good and high-precision constant-force output can be achieved.

Description

Two-way constant force output air-floating apparatus

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 the additional power in the target workpiece of an effect 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, but because the transient response speed of gas is slow, be generally used for realizing action output, 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 provides that a kind of ouput force value is accurate, the two-way constant force output air-floating apparatus of good stability.

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

A kind of two-way constant force output air-floating apparatus, comprises cylinder barrel, connecting rod piston, end cap, output shaft, limiting stopper.

Described piston sleeve is contained in cylinder barrel, and end bracket enclosed is passed through at described cylinder barrel two ends.

Described cylinder barrel middle part has the two laterally zygomorphic axial notches in place, described axial notch two ends mounting limit piece.

First piston, the second piston and middle piston rod that described connecting rod piston comprises two ends projection, between described first piston, the second piston and cylinder barrel, leave minimum gap, described piston rod middle part connects output shaft, and described output shaft is through the axial notch on cylinder barrel.

Described cylinder barrel two ends are respectively equipped with the first suction port and the second suction port.Described the first suction port is connected respectively Proportional valve and gas holder with the second suction port by tracheae.

The radially throttle orifice that is uniformly distributed along the circumference on described first piston and the second piston, described first piston and the second piston are beaten axial blind hole along end face respectively and are formed inlet hole, and described inlet hole communicates with described radially throttle orifice; Described first piston and the second piston are respectively equipped with a circle groove near end, in described groove, uniform radial blind holes forms first and unloads pore, beat axial blind hole to first piston and the second piston respectively from piston rod one end and form second and unload pore, described first unloads pore and second unloads pore and communicates.

Orifice plug is installed in described radially throttle orifice;

Described radially throttle orifice in axial direction has two groups at least; Described radially throttle orifice, inlet hole and first unload pore and second and unload isolation mutually between pore.

Mentality of designing of the present utility model and advantage show: cylinder barrel and piston are Integral design, and processing is simple on the one hand, can meet on the other hand assembly precision requirement.

Uniform radially throttle orifice on connecting rod piston, the pressurized gas in cylinder barrel enter radially throttle orifice by inlet hole, form air film in the gap of cylinder barrel and piston, and two place's air films are that piston provides support and lubricates, and structure and plenum system are simple, bearing capacity good.

Radially near throttle orifice, be equipped with pressure relief groove, pressure relief groove communicates with extraneous normal pressure, prevents that cylinder barrel inner high voltage gas from entering air supporting gap air film is exerted an influence on the one hand, plays seal action, forms on the other hand atmospheric area in gap, promotes the formation of air film.

Cylinder barrel middle part has the two laterally zygomorphic axial notches in place, and piston rod middle part connects output shaft, and output shaft is through the axial notch on cylinder barrel, and the range of movement of output shaft is in axial notch.

Cylinder barrel two ends are respectively equipped with two suction ports, suction port connects Proportional valve and gas holder by tracheae, on output shaft, the size of ouput force value is relevant with the pressure size of cylinder barrel two ends input, the pressure size of passing ratio valve and gas holder control cylinder barrel two ends input air pressure, the pressure difference that guarantees cylinder barrel two ends remains unchanged, and can realize constant force output.

Accompanying drawing explanation

Fig. 1 is two-way constant force output air-floating apparatus schematic diagram

Fig. 2 is cylinder barrel schematic perspective view

Fig. 3 is connecting rod piston schematic diagram

Embodiment

A kind of two-way constant force output air-floating apparatus, comprises cylinder barrel 3, connecting rod piston 6, end cap 1, output shaft 8, limiting stopper 10.

Piston 6 is sleeved in cylinder barrel 3, and cylinder barrel 3 two ends seal by end cap 1.

Cylinder barrel 3 middle parts have the two laterally zygomorphic axial notches in place, axial notch two ends mounting limit piece 10.

First piston, the second piston and middle piston rod that connecting rod piston 6 comprises two ends projection, leave minimum gap between described first piston, the second piston and cylinder barrel 3, and piston rod middle part connects output shaft 8, and output shaft 8 is through the axial notch on cylinder barrel 3.

Cylinder barrel 3 two ends are respectively equipped with the first suction port 2 and the second suction port 9.

Radially throttle orifice 5, radially installation orifice plug in throttle orifice are uniformly distributed along the circumference on first piston and the second piston; First piston and the second piston are beaten axial blind hole along end face respectively and are formed inlet hole 7, and inlet hole 7 communicates with described radially throttle orifice 5; First piston and the second piston are respectively equipped with a circle groove 4 near end, the interior uniform radial blind holes of groove 4 forms first and unloads pore 11, beating axial blind hole to first piston and the second piston respectively from piston rod one end forms second and unloads pore 12, the first and unload pore 11 and second and unload pore 12 and communicate.

Radially throttle orifice 5 in axial direction has two groups at least; Radially throttle orifice 5, inlet hole 7 and first unload pore 11 and second and unload isolation mutually between pore 12.

Claims (1)

1. two-way constant force output air-floating apparatus, is characterized in that: comprise cylinder barrel, connecting rod piston, end cap, output shaft, limiting stopper;

Described piston sleeve is contained in cylinder barrel, and end bracket enclosed is passed through at described cylinder barrel two ends;

Described cylinder barrel middle part has the two laterally zygomorphic axial notches in place, described axial notch two ends mounting limit piece;

First piston, the second piston and middle piston rod that described connecting rod piston comprises two ends projection, between described first piston, the second piston and cylinder barrel, leave minimum gap, described piston rod middle part connects output shaft, and described output shaft is through the axial notch on cylinder barrel;

Described cylinder barrel two ends are respectively equipped with the first suction port and the second suction port; Described the first suction port is connected respectively Proportional valve and gas holder with the second suction port by tracheae;

The radially throttle orifice that is uniformly distributed along the circumference on described first piston and the second piston, described first piston and the second piston are beaten axial blind hole along end face respectively and are formed inlet hole, and described inlet hole communicates with described radially throttle orifice; Described first piston and the second piston are respectively equipped with a circle groove near end, in described groove, uniform radial blind holes forms first and unloads pore, beat axial blind hole to first piston and the second piston respectively from piston rod one end and form second and unload pore, described first unloads pore and second unloads pore and communicates;

Orifice plug is installed in described radially throttle orifice;

Described radially throttle orifice in axial direction has two groups at least; Described radially throttle orifice, inlet hole and first unload pore and second and unload isolation mutually between pore.

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