Device to control lifting-digging mechanisms

FIELD: construction.

SUBSTANCE: device to control lifting-digging mechanisms comprises a compressor, an oil and moisture separator and a receiver, pneumatically serially connected to each other. At the same time the outlet of the receiver is pneumatically connected to inlets of adsorbers with evenly distributed heaters, and outlets of adsorbers are pneumatically connected to a load. The compressor is equipped with a suction filter, comprising a casing with a conical bottom, a nozzle of cleaned air exhaust, a condensate extractor, installed in the bottom hole, a reflecting partition and a nozzle of cleaned air supply. The filter casing is made in the form of a double-layer jacket with an air cavity connected by the nozzle of heating regenerated air supply by means of a pipeline and a control valve with adsorbers by a nozzle of heating regenerated air discharge into atmosphere. Evenly distributed heaters in adsorbers are separated by partitions from adsorbent grains. At the same time each of the partitions is made of a bimetal. Besides, the material of the bimetal at the side of the heater has a conductivity ratio that is 2.0-2.5 times higher than the material at the side of adsorbent grains.

EFFECT: maintenance of efficient operation during long-term operation of a control device of lifting-digging mechanisms, by provision of specified quality of compressed air drying due to elimination of thermal damage of adsorbent grains.

3 dwg

 

The invention relates to pneumatic control systems for excavators and cranes, working in freezing temperatures.

Known control device lifting and digging mechanisms (see RF patent 2158805, IPC E02F 9/22, publ. 10.11.2000)containing the compressor, moisture separator and receiver, pneumatically connected in series to each other, and the output of the receiver pneumatically to the inputs of the adsorbers with uniformly distributed heaters, and conclusions of the adsorbers is pneumatically connected to the consumer, the compressor is equipped with a suction filter, comprising a housing with a conical bottom and a hole in its lower part, a fitting conclusion purified air trap located in the hole of the base plate, the reflective septum, nipples input cleanable air filter housing made in the form of a double-layer shirt with an air cavity, which is connected by a hose warming regenerated air through the pipeline and control valve with adsorbers and a fitting conclusion warming regenerated air to the atmosphere.

The disadvantage is the power consumption due to an increase in aerodynamic drag of the air filter due to the presence in the intake atmospheric air a significant amount of solid particles technological dust, about reclaimed specific operating conditions, and the presence of solid particles in the cavity of the compressor not only reduces its mass productivity on compressed air, but also contributes to emergency mode, which ultimately reduces the efficiency of lifting and digging mechanisms.

Known control device lifting and digging mechanisms (see RF patent 2400598, IPC E02F 9/22, publ. 27.09.2010)containing the compressor, moisture separator and receiver, pneumatically connected in series to each other, and the output of the receiver is pneumatically connected to the inputs of the adsorbers with uniformly distributed heaters, and conclusions of the adsorbers is pneumatically connected to the consumer, while the compressor is equipped with a suction filter, comprising a housing with a conical bottom and a hole in its lower part, a fitting conclusion purified air trap located in the hole of the base plate, the reflective wall, the hose cleaned air, and the filter housing made in the form of a double-layer shirt with an air cavity, which is connected by a hose warming regenerated air through the pipeline and control valve with the adsorbers and a fitting conclusion to the atmosphere warming the reactivated air.

The disadvantage is the lower quality compressed air drying due to thermal destruction of the grains of the adsorbent, the con is asterousia with uniformly distributed heaters by volume of the adsorber, which leads to deterioration as pneumatic equipment, and lifting and digging mechanisms.

Technical challenge is maintaining an effective working during long-term operation of the control device of lifting and digging mechanisms by providing a given quality compressed air drying by eliminating thermal destruction of grains of the adsorbent by direct contact with their uniformly distributed throughout the volume of the adsorbers heaters.

The technical result is achieved in that the control device lifting and digging mechanisms contains the compressor, moisture separator and receiver, pneumatically connected in series to each other, and the output of the receiver is pneumatically connected to the inputs of the adsorbers with uniformly distributed heaters, and conclusions of the adsorbers is pneumatically connected to the consumer, while the compressor is equipped with a suction filter, comprising a housing with a conical bottom and a hole in its lower part, a fitting conclusion purified air trap located in the hole of the base plate, the reflective wall, the hose cleaned air, and the filter housing made in the form of a double-layer shirt with an air cavity, which is connected by hose warming regenerated air through trubor the water and regulating valve with adsorbers and a fitting conclusion to the atmosphere warming the reactivated air, moreover, on the inner surface of the fitting input of cleaned air, made in the form of a tapering nozzle, are curved groove with a profile in the form of a dovetail, and its inlet is made of a circular groove, combined with a device for removing contaminants, with a circular groove is connected with the curved grooves and with a grid.

Figure 1 shows a schematic diagram of the control device of lifting and digging mechanisms; figure 2 - profile curved grooves in the dovetail; figure 3 - the inner surface of the fitting input of cleaned air to the device remove the dirt.

The device consists of a series connected system of pipes (ducts) 1 suction filter 2, compressor 3, the moisture separator 4, a receiver 5, two cyclically operating adsorbers 6 and 7, a heater 8 with thermostats 9, secured to each heater element 8. In this case the suction filter 2 includes a housing 10 made in the form of a double-layer shirt with an air cavity, a conical bottom 11 with a hole 12 in its lower part, a fitting conclusion cleaned intake air 13, fittings enter cleaned air 14, a valve 15 located in the hole 12 of the conical bottom 11, the reflective wall 16, the hose heating is the future of air 17, the pipe 18 connecting through control valve 19 fitting 17 with adsorbers 6 and 7, the nozzle of the discharge of heated air into the atmosphere 20, with the control valve 19 also provides an air vent after the regeneration of the adsorbers in a positive atmosphere at ambient temperatures. On the inner surface 21 of fitting the input of cleaned air 14 made in the form of a tapering nozzle, are curved groove 22 with a profile in the form of a dovetail, and his entrance opening 23 is made in a circular groove 24, connected to the removal device of contamination 25, with a circular groove 24 is connected with a curved grooves 22 and provided with a grid 26.

The heaters 8 in two cyclically operating adsorbers 6 and 7 from the grains of the adsorbent 27 separated by partition walls 28, each of which is made of bimetal, and the material 29 from the side of the heater 8 has a coefficient of thermal conductivity (for example, the coefficient of thermal conductivity of aluminum is equal to 207 W/(m·d), see, Nashchyokin CENTURIES of Technical thermodynamics and heat transfer. M., 1980. - 469 C. Il.) 2.0-2.5 times higher than the material 30 (e.g., coefficient of teplovodne brass is 85 W/(m·g)) from the grains of the adsorbent 27.

The device operates as follows.

It is known that at high temperature air or gas in the process of regeneration of the adsorbent and the OS is Benno, by direct contact of the grains of the adsorbent with heater observed thermal destruction by cracking (see, for example, Serbinova E.N. Industrial adsorption of gases and vapors. M.: Higher school, 1989. - 368 SIL.). The result is drastically reduced as the purification of compressed air and the operational reliability of the overall device control lifting and digging machines. When eliminating direct contact of the grains of the adsorbent 27 and heater 8 through the use of walls 28 of the bimetal observed redistribution of heat flux, since thermal conductivity of the material 29 is higher, the heat from the heaters 8 quickly dispatched by material 29 of the partition 28, and after contact with the material 30 decreases the rate of heat flow (see, for example, p.40. Choi PV calculation Methods of the individual tasks of heat and mass transfer. M: Energy, 1971. - 384 SIL.). This leads to uniform heating of the grains of the adsorbent with gradually increasing temperature gradient to the normalized values, for example, 100°C., i.e. to maintain the specified regeneration process, preventing thermal destruction of the grains of the adsorbent.

In addition, the partition wall 28 of the bimetal causes during the passage through it of the heat flux to the formation of thermofibre (see, for example, Dmitriev V.G. BIM is of Tallaght. Perm, 1990. - 297 SIL.). This prevents the accumulation of grains of the adsorbent on the partition 28, and in the process of thermofibre point of contact between the partitions 28 grains of the adsorbent is continuously moved on the surface that almost accelerates thermal stress conducive to the destruction of the adsorbent.

The specific operating conditions, lifting and digging mechanisms due to the presence of significant amounts of solid particles technological and atmospheric dust sucked in by the compressor 3 atmospheric air, so at the beginning of his work this mixture of air and mass of dirt is moved to the hose cleaned air 14 and is in contact with the grid 26, while the larger particles are separated from the stream, and smaller through the inlet hole 23 penetrates into the internal cavity of the fitting input of cleaned air 14. As the hose cleaned air 14 is in the form of a tapering nozzle, the flow of intake air pollution increases its speed and moving on curved grooves 22, twists. In the solid particles that have passed the grid 26, the centrifugal force is discarded to the inner surface 21 of fitting the input of cleaned air 14 and fill the cavity of curvilinear grooves 22, which are accumulated and, as a result of these cavities profile in the form of a swallow is and tail, do not fall again into the moving stream, and move to the side of the circular grooves 24, where under the action of gravity moved to the device removing contaminants 25 for subsequent removal manually or automatically (not shown in figure 1).

The remaining fine solid particles with a stream of spinning the intake of atmospheric air, leaving the fitting input of cleaned air 14 made in the form of a tapering nozzle, impinges on the reflective wall 16. As a result of contact of the suction flow of atmospheric air with a reflective wall 16 of the particulate pollution from a drop or lithobates moisture in the majority fall into the conical bottom 11, which are accumulated in the accumulation and released from the suction filter 2 valve 15 through the opening 11.

Cleaned intake air through the fitting conclusion cleaned intake air 13 through the duct 1 is supplied to the compression in the compressor 3, and then through the oil separator 4, a receiver 5 is directed to the drying in the adsorbers, for example in the adsorber 6. Cleaning the intake of atmospheric air from the solid particles and drip or lithobates moisture reduces the intensity of production of pneumonaie from 12% to 18% depending on operating conditions of the compressor.

Osseni the compressed air is supplied to the pneumatic equipment management system lifting and digging machines. At the same time a portion of the dried air is directed into the second adsorber 7, which is in the regeneration mode. First as the regenerative air heater element 8 is activated by the controller 9 and heats the air. The second heater element regenerating air is supplied at a temperature of 100°C. the Power consumption of the second heater element is below the first power and the sum of the costs of heat loss by the body of the adsorber in the environment and heat needed for regeneration. Similarly, there are other elements of the heater, and each of them has an individual connection to the power supply via the controller 9.

Suction filter 2 compressor 3 is in the body area where the suction air temperature close to the ambient temperature or the suction filter 2 is taken out from the body of the room. As a result, when low ambient temperatures, and especially when snow storms, frost or rain observed accumulation of solid impurities and drop or lithobates moisture in the cross section of the inlet air filter. This ultimately leads to increased flow resistance in the suction path of the compressor 3 and, consequently, increases the energy consumption for production of compressed air. Chrome is also the presence of additional moisture in compressed air leads to more severe conditions of moisture separator 4, and the possible entry of moisture into the adsorbers 6 and 7 leads to cracking of the grains of the adsorber, which dramatically affects the drying process and significantly reduces the efficiency of operation of pneumatic equipment lifting and digging mechanisms. Therefore, the proposed design of the suction filter of the compressor 3 provides additional cleaning atmospheric air, especially at low temperatures environment.

Compressed air after regeneration, for example, the adsorber 7 with a temperature of about 80°With the pipe 18 is directed through the control valve 19 to the hose heating air 17 and fills the air cavity of the double layer shirt that made the body 10 of the suction filter 2. Heating the air, giving the heat to the housing 10, is discharged into the atmosphere through the nozzle 20.

Positive ambient temperatures, which do not require heating of the housing 10 of the suction filter 2, the heated compressed air after regeneration of the adsorbers 6 or 7 through the pipe 18 through a control valve 19 is directly emitted into the atmosphere. Drip the moisture emitted from the regenerating air in the atmosphere and partially incoming atmospheric air is in the intake filter 2 compressor 3, after fitting 14, bumping on the reflective wall 16, accumulates in the bottom 11 and through valve 15 is thrown out.

The originality of the proposed technical solution is that the execution of the partition separating from direct contact heater and grains of the adsorbent, bimetal leads to the elimination of thermal destruction of the adsorbent, and the optimal heating of the grains of the adsorbent. While continuously under the action of thermofibre move the contact point on the surface of grains with a moving heat flux, which also improves the regeneration process, as it not only raises the quality of compressed air drying, and increases the efficiency of the device control lifting and digging mechanisms.

The control unit lifting and digging mechanisms that contains the compressor, moisture separator and receiver, pneumatically connected in series to each other, and the output of the receiver is pneumatically connected to the inputs of the adsorbers with uniformly distributed heaters, and conclusions of the adsorbers is pneumatically connected to the consumer, while the compressor is equipped with a suction filter, comprising a housing with a conical bottom and a hole in its lower part, a fitting conclusion purified air, steam trap, located in the twistie bottoms, reflective wall, the hose cleaned air, and the filter housing made in the form of a double-layer shirt with an air cavity, which is connected by a hose warming regenerated air through the pipeline and control valve with adsorbers and a fitting conclusion to the atmosphere warming the reactivated air, wherein the uniformly distributed heaters in the adsorbers from the grains of the adsorbent is separated by partitions, each partition is made of bimetal, and the material of the bimetal from the heater has a coefficient of thermal conductivity of 2.0-2.5 times higher than that of the material from the grains of the adsorbent.



 

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