RU2328625C1 - Volume proportioner for discrete adjustment of hydraulic motor output link speed and travel - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: proportioner is designed for a volume hydraulic drive, in particular, for pulse-frequency modulation systems featuring an accuracy flow rate pulse generation. The volume proportioner has a case, inlet and outlet channels, a rotor incorporating travel limiters with a separator spaces arranged between the said limiters. The rotor runs relative to the case controlled by the drive.

EFFECT: higher stability of operation.

Description

The invention relates to a volumetric hydraulic actuator, and in particular to systems with pulse frequency modulation and thin formation of flow pulses.

A hydraulic pulse-frequency drive device is known (AS USSR No. 322529. BI No. 36, 1971), including dispensers installed in the pressure and drain lines of the actuator and controlled by an interpolator. The device includes thyristor control units connected to the inputs of the input pulse divider between these blocks.

The disadvantage of this device is the design complexity to ensure operation at significant loads.

Known pulse flow source with a thin formation of flow pulses, containing a volumetric metering device consisting of a cylinder with a piston, the volume of the cavities of which forms the value of flow pulses, a spool valve with electromagnetic control and an electronic switch (see Electro-hydraulic pulse systems with pulse frequency modulation and thin the formation of flow pulses. Sosonkin VL Discrete hydraulic (tracking and step systems of machines). M., "Engineering", 1972, 164 S. .29-31).

In the known dispenser, the periodic switching of the cavities of the dispensing device is carried out by a two-position valve, connected to the dispensing device by channels or pipelines. The presence of movable spools in the inlet and outlet lines adversely affects the stability of the magnitude of the flow pulses. This is especially true with a decrease in the volume of flow pulses and with an increase in the frequency of pulses (i.e., with a decrease in the control resolution while maintaining the flow). In addition, the presence of a control valve with control electromagnets and an electronic switch significantly increases the size of the dispenser and the probability of failure.

The objective of the invention is to increase the stability of the volumetric dispenser, controlled directly from the device of numerical program control (CNC).

The problem is achieved in that the volumetric dispenser contains a drive, a housing, inlet and outlet channels. In the housing there is a rotary drive and a rotating rotor with stroke limiters, between which a cavity separator is installed, the rotor is connected to the drive.

The volumetric dispenser is characterized by the presence of the following significant distinguishing features:

- volumetric dosing device installed in the rotor;

- the cavity separator simultaneously performs the function of the locking element, being in the corresponding extreme positions;

- the stroke limiters of the cavity separator are simultaneously saddles of the locking element;

- the formation of the frequency and number of pulses is carried out by a drive from a stepper motor instead of the spool distributor and electronic switch.

The essence of the claimed invention is illustrated in the drawing, which shows a schematic diagram of a dispenser.

The dispenser contains a housing 1, a rotor 2 installed therein with cavity separator 3 and stroke limiters 4, a supply 5 and a discharge 6 channels are placed in the housing 1, the rotor 2 is rotated by a drive (not shown).

The magnitude of the flow pulse is determined by the diameter and free travel of the cavity separator 3, the volume of the passing working fluid is determined by the angle of rotation of the rotor 2, and the flow rate is determined by the rotational speed of the rotor 2.

In the rotor 2 there is a radial hole, which is divided into two cavities by a cavity separator 3.

The device operates as follows. When the rotor 2 rotates, each cavity periodically connects either to the inlet channel 5 or to the outlet channel 6, while the opposite cavities are always either simultaneously locked or simultaneously connected to the opposite channels 5 and 6. Under the action of the working fluid pressure, the cavity separator 3 makes a return translational motion relative to the rotor 2, while the cavity connected to the inlet channel 5 is filled with a working fluid, and the working fluid is displaced from the cavity connected to the outlet channel 6.

The separator of the cavities 3 simultaneously serves as a locking element, and the stroke limiters 4 are simultaneously the saddles of the locking element, while the tightness in the extreme positions of the cavity separator 3 is ensured through the contact line of the cavity separator with the stroke limiter 4. This reduces the gap requirements between the stroke separator 3 and the walls of the radial hole in the rotor 2.

The combination of the cavity separator with the functions of the locking device and the absence of a spool valve with electromagnetic control and an electronic switch can increase the stability of the volumetric dispenser and reduce the likelihood of its failure.

Claims (1)

Volumetric dispenser for discrete control of the speed and magnitude of the movements of the output links of the hydraulic motors, comprising a housing, inlet and outlet channels, a volumetric metering device, characterized in that the housing is rotatable, a rotor with travel stops, between which a cavity separator is installed, and a rotor connected to the drive.