SU1288389A1 - Vibrating platform - Google Patents

Abstract

The invention relates to vibration technology and can be used in vibrating platforms for compacting hard concrete mixtures. The purpose of the invention is to improve the working efficiency by automatically changing the vibration parameters during the molding process. In the axial borings 27 and 28 of the spool sleeve 23 of the distributor, a movable pusher (T) 26 is located. One end of T 26 is spring-loaded relative to the I8 housing, and the other is spherical and located in the piston cavity 12 of the hydraulic cylinder with the possibility of interaction with the piston 5. f 26 consists of two parts 32 and 33, which are axially displaceable and spring-loaded one relative to the other. Parts 32 and 33 T 26 are arranged to form a variable volume chamber 34 between them, which is connected to a piston cavity 12 thrusters; o SL J3 5 gV V / 4J.

Description

A salt hole 35, made in T 26. As a result of this execution of the vibrating plate during the molding of the articles, it is possible to change the vibration parameters smoothly and continuously in such a way that

one

The invention relates to vibration technology and can be used in vibrating platforms for compacting hard concrete mixtures.

The purpose of the invention is to increase the working efficiency by automatically changing the vibration parameters during the molding process.

The drawing schematically shows the vibroplatform, section.

The vibrating plate contains the working body 1, mounted on the base 2 by means of elastic supports 3 and a vibration exciter (not indicated), including a hydraulic cylinder 4 with a piston 5 and a rod 6 connected by a hinge 7 The rod 6 interacts with the working body 1. The piston 5 has channels 8 and 9 connecting the chambers 10 and 11 of the hydrostatic unloading of the piston 5 with the piston cavity 12 and with the rod cavity 13 of the hydraulic cylinder 4. The hydraulic pump 14 of the vibration exciter is connected to the cavities 12 and 13 through the distributor 15 and the pipelines 16 and 17. In the housing 18 distributor 15 mouth The sleeve 19c is connected with annular channels 20-22, a spool bushing 23 with annular recesses 24, and channels 25 and a pusher 26 mounted in axial bores 27 and 28 of the sleeve 23. The pusher 26 has stops 29 and 30. The end of the pusher 26 installed in the bore 28 is spring loaded with respect to the housing 18, and the end of the pusher 26, mounted in the bore 27, is spherical and interacts with the piston 5. The pusher 26 is made of two parts 32 and 33, between which is located a variable-displacement ferrite chamber 34. throttle bore 5 piston cavity 12. Parts 32 and 33 are mounted for

at the beginning of the molding cycle, the maximum tuned oscillation amplitude and minimum frequency are observed, and at the end of the cycle the maximum frequency and minimum oscillation amplitude are observed. 1 il.

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B levo about movement and spring loaded spring 36 one relative to another. In the housing 18 of the distributor 15, the through channels 37-39 are made. The channels 37 and 39 are connected to the tank 40 via pipe 41, and the channel 38 to the hydraulic pump 14 through pipe 16. The hydraulic pump 14 is connected to the tank 40 through the safety valve 42 .. The cavity 43 is provided in the housing 18 of the distributor 15 and connected by pipe 17 with a cavity of 13.

The vibrating platform works as follows.

When removed from the concrete mix, the elastic supports 3 press the working body 1 upwards, the piston 5 also moves upwards. The two-piece assembly 32 and 33, the pusher 26, tracking the movement of the piston 5, also moves upwards. The stroke of the elastic supports 3 and the springs 31 is selected so that when the piston 5 stops in the upper position between the piston 5 and the upper part 32 of the pusher 26, there remains a gap equal to the maximum swing of the vibratory plate vibrations. As a result, the upper part 32 under the action of the compressed spring 36 slowly moves upwards, sucking the working fluid into the damper chamber 34. After sampling the gap between the piston 5 and the spherical end of the upper part 32 of the pusher 26, the vibrating plate is ready for operation. When installing the form with a concrete mixture on the working body 1, the latter moves the rod 6 and the piston 5 down. The slurry 5 acts on the upper part 32 of the composite pusher 26. Pressure is applied in the damper chamber .34. The diameter of the lower part 33 of the composite pusher is chosen so that a pressure is created in the damping chamber 34 that is greater than the pressure in the cavity 12

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hydraulic cylinder 4, which occurs when working vibroplatform. As a consequence, the lower part 33 moves downward, compressing the spring 31, the upper support 29 displaces the slide sleeve 23 to the lower position. In this case, the annular groove 21 connects to the piston cavity 12 of the hydraulic cylinder 4, and the groove 22 connects to the cavities 43 and 13. When pumped by the hydraulic pump 14, the working fluid flows through conduit 16, channel 38, groove 21, groove 24, upper channel 25 and boring 27 into the cavity 12 of the hydraulic cylinder 4,

The hydrostatic centering of the piston 5 is carried out as follows.

When the piston 5 moves upwards, the pressure in the cavity 12 is greater than that in the cavity 13. The working fluid passes through the channels 8 into the chambers 10, the plunger 5 is centered against the walls of the hydraulic cylinder 5. The zolotnik sleeve 23 is shifted by pressure to the bottom stop 30 on the bottom 33 pusher 26, compressing the spring 31, and the piston 5 begins to move upwards. The fluid from the cavity 13 enters through the pipeline 17, the bore 28 into the tank 40. The stop 30 of the lower part 33 of the pusher 26 shifts the golden sleeve 23 to the neutral due to the rigidity of the spring 31 and, due to the inertia of the working body 1, several Bbmie neutrals. In this case, the groove 21 is connected through the channel

25 in the spool bushing 23 and its bore 28 with cavities 43 and 13, and the groove 20 with the cavity 12 of the hydraulic cylinder 4. The working fluid from the hydraulic pump 14 enters the cavity 43, raises the spool bushing 23 to the stop 29 of the upper part 32 of the pusher

26 and through the pipeline 17 enters the cavity 13 of the hydraulic cylinder 4, and creates a force on the piston 5 down. When the movement of the piston 5 down the pressure in the cavity 13 is greater than in the cavity 12,

and part of the working fluid through

It descends to the lower position and the cycle repeats.

Due to the pressure differential between the damper chamber 34 and the piston 5 cavity 12, the liquid from the damper chamber 34 is squeezed out into the piston cavity 12. In this case, the backlash between the stops 29, 30 and the sleeve 23 is reduced, and the spring 36 is compressed. The diameter of the throttle bore 15 is adjusted so that the pressure in the damper chamber 34 and, accordingly, the feedback gap between the stops 29 and 30 and the bushing 23 decreases from the required maximum value to the required minimum value in a time equal to the required molding time of the Seton mixture. A smooth reduction of the gap in feedback leads to a gradual decrease in the amplitude of oscillations of the working organ 1.

The pump 14 has a constant capacity, so when the oscillation amplitude decreases, the oscillation frequency of the piston 5 increases. The intensity of the vibration parameters changes by the throttle hole 34. After the molding is completed, the concrete mixture is removed from the working body 1 and under the action of elastic supports 3 the latter is set to the upper position .

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Claims (1)

Invention Formula A vibrating platform containing a working body mounted on the base by means of elastic supports, and a driver of oscillations comprising a hydraulic cylinder, a piston with a rod installed in the cylinder to form piston and rod cavities, and a hydraulic pump connected to the cylinder cavity through a distributor made in the form of a spool bushing installed in the housing, in the axial bores of which mobile channels 9 enters chambers 11, 50 pushers with stops, one end of which is centered to piston 5 relative to the walls of hydraulic cylinder 4. Piston 7 starts to lower, compressing spring 31, and stop 29 of upper part 32 is spring-loaded relatively to the bone, and the surface of the other spherical and located in the piston cavity of the hydraulic cylinder with Boiler 26 biases the spool bushing for interaction with the piston. 23 due to the inertia of the working body 1 is somewhat lower than the neutral, while the spool bushing 23 went over five 0 It descends to the lower position and the cycle repeats. Due to the pressure differential between the damper chamber 34 and the piston cavity 12, the fluid from the damper chamber 34 is squeezed out into the piston cavity 12. In this case, the clearance in feedback between the stops 29, 30 and the spool bushing 23 is reduced, and the spring 36 is compressed. The diameter of the throttle bore 15 is adjusted so that the pressure in the damper chamber 34 and, accordingly, the feedback gap between the stops 29 and 30 and the bushing 23 decreases from the required maximum value to the required minimum value in a time equal to the required molding time of the Seton mixture. A smooth reduction of the gap in feedback leads to a gradual decrease in the amplitude of oscillations of the working organ 1. The pump 14 has a constant capacity, so when the oscillation amplitude decreases, the oscillation frequency of the piston 5 increases. The intensity of the vibration parameters changes by the throttle hole 34. After the molding is completed, the concrete mixture is removed from the working body 1 and under the action of elastic supports 3 the latter is set to the upper position . five 0 35 0 five Invention Formula A vibrating platform containing a working body mounted on the base by means of elastic supports, and a driver of oscillations comprising a hydraulic cylinder, a piston with a rod installed in the cylinder to form piston and rod cavities, and a hydraulic pump connected to the cylinder cavity through a distributor made in the form of a spool bushing installed in the housing, in the axial bores of which mobile the other is spherical and located in the piston cavity of the hydraulic cylinder with the possible difference in that, in order to increase the working efficiency by means of an automatic change 512883896 vibration parameters in the process of forming and arranged to form a movable, the pusher is made up of a variable volume chamber between them of two parts installed with an axial displacement connected to the piston cavity and axial movement in a spring-loaded one other- 5 pusher.