SU1489991A2 - Table vibrator - Google Patents

Abstract

The invention relates to the production of precast concrete and reinforced concrete and reduces energy consumption and intensifies the compaction process. This is achieved due to the fact that the pneumatic valve of the exciter of vertically directed oscillations is made as mounted in the housing 17 with the upper 33 and lower 32 piston seats of the outer 20 with concentric and relative to each other movable outer 20 with an annular abutment 25 and inner 21 sections. On the piston rod 22 is mounted a disk 23 in contact with the seats 32 and 33, and the diameter of the inner section of the piston exceeds the maximum diameter of the lower seat. 4 il.

Description

The invention relates to the construction industry and can be used primarily for the production of concrete and reinforced concrete structures, and is an improvement of the invention according to the author. No. 1260195.

The purpose of the invention is to reduce energy consumption and intensify the compaction process.

FIG. 1 shows a vibroplatform, a general view, in FIG. 2 - the design of the oscillation exciter; in: FIG. 3 - pneumatic valve, in the position of compressed air intake into the exciter; in fig. 4 - the same in the exhaust position.

The vibrating plate contains mounted on the base 1 by means of elastic elements 2 in the form of pneumatic supports mobile frame 3 and located under it drummer 4, which are in contact with each other through elastic buffer elements 5. On drummer 4 is fixed pathogen 6 of vertical directional oscillations. The latter is made in the form of an annular body 7 fixed on the hammer 4, covering the latter, a glass 8 with a cut-off skirt 9.

Friction elements 10 are fastened to its inner surface. In addition, glass 8 covers the fixed ferrule 11, and head end 12 is connected around the perimeter by means of an elastic cuff 13, forming a force chamber 14 with glass 8. Force to press the friction elements 10 to the ring body 7 is selected from the field.

p / f F P / f,

where p is the maximum force developed by the power chamber; P is the maximum force of interaction of the impactor with the moving frame; f is the coefficient of friction. The compressed air is supplied to the exciter 6 through the pneumatic valve 15 through the duct 16.

The operation of the exciter and elastic elements is controlled from the control panel located outside the area. The console is equipped with valves, pressure gauges, a pressure control valve for pressure regulators in pneumatic supports and an electric block for controlling the operation of a pneumatic valve.

The pneumatic valve includes a housing 17 with a cap 18 and a sleeve 19, and a piston consisting of an outer 20 and an inner 21 section, the inner section being rigidly connected to the rod 22 on which the disk 23 is located. The housing has limiters 24 lowering the outer section of the piston provided with an annular abutment 25. The lid 18 is provided with a regulator 26 of the bore section of the connecting tube 27 of the control chamber 28. The valve has an inlet 29, an outlet 30 and an opening 31 for communicating with the exciter 6. Inside the valve there are lower 32 and upper 33 seats .

In order to ensure that the piston rod 22 is in the lower position when compressed air is supplied to the control chamber 28 and the inlet 29, the force acting on the inner section 21 of the piston from above must be greater than the force acting on. lower end of the rod bottom. This is achieved by the fact that the diameter D .j and the area of the inner section of the piston are larger than the diameter d and the area of the lower seat 32 of the pneumatic valve.

Similarly, to ensure that the piston is lowered from the upper to the lower position when the compressed air is supplied to the control chamber 28 and the valve cavity, the force acting on both axes of the piston from above must be greater than the force acting on the disk 23 from the bottom. This is achieved by the fact that the diameter D ,, and the area of the outer section of the piston are larger than the diameter d and the area of the upper seat 33 of the pneumatic valve.

The vibrating platform is set up to work in the next um way.

Into the elastic elements 2 serves a little air, the pressure is brought to a volume that provides a complete choice of the gap inside the oscillator between the head 12 and the cup 8, the initial gap f between the buffer elements 5 and the movable frame 3 is selected from condition 0, 02 d, 0.01 m. Then, the rigid cage 11 is relaxed until the friction elements 10 begin to slip relative to the ring case.

The pressure in the elastic elements increases to a level that ensures a reduction in the gap. to zero, after which with the help of the tightening holder 11 the glass in the region of the slits together with the friction elements 10 is pressed against the ring case with the force F, the value of which is chosen from the condition

p / f F P / f.

The vibrating platform works as follows.

They turn on the compressed air supply to the elastic elements 2, which raise the drummer 4 until the buffer elements 5 are pressed against the movable frame 3. Then the mold with the concrete mix is set on the latter. The electrical control unit is turned on and the compressed air is supplied to the exciter 6 exciter, which pushes the hammer 4 down, overcoming the elasticity of the elastic elements 2, in which the pressure increases and the potential-accumulated energy I accumulates.

When the striker reaches a certain position, the pneumatic valve 15 switches, the air exhaust from the exciter 6 oscillations and the compressed elastic elements 2 force up the striker 4, ° C, which by the buffer elements 5 hits the bottom of the moving frame 3, the latter transmits a blow to the form with a concrete mix. Then oscillations occur on the elastic gaskets, by means of which the movable frame 3 is attached to the foundation.

At the moment of impact, the pneumatic valve 15 switches over again, compressed air is introduced into the exciter 6 oscillation agent and the cycle repeats.

Pneumatic valve 15 operates as follows.

Compressed air is fed into the inlet 29, as well as through the pipe

4899916

27 into the control chamber 28. Since the diameter D and the area of the inner section 21 of the piston are larger than the diameter Q., and the area of the inlet opening 29, the resultant of oppositely directed compressed air forces, is directed downwards, lowers the disk 23 of the rod 22 onto the bottom seats

1Q of the seat 32. Compressed air does not enter the exciter 6, the inner 21 and outer 20 sections of the piston are in the lower position, while the outer section 20 is located at the lowering of the piston 24.

When the electric control unit is turned on, compressed air is released from the control chamber 28 through the port 27. The air pressure in the equalizer chamber drops and the resultant force, directed upward, raises the rod 22 with the disk 23 and the internal piston 21. Compressed air begins to flow through the lower 25th saddle 32 into the exciter 6 oscillations. After being touched by a disk 23 to the annular stops 25 of the outer section 20, the latter also begins to rise. At the same time, the rate of decrease. the volume of the control chamber 28 exceeds the rate of air release from it and the pressure drop, as a result of which the resistance to movement of the rod 22 increases and the rate of its rise in the final section decreases. In rezul30

35

Tate punch drive on the seats

The upper seat 33 loosens and does not deform the valve components.

When the striker 4 reaches the lower position, the electrical control unit sends a command to the exhaust of compressed air from the exciter 6 oscillations. For this purpose, compressed air is supplied to the control chamber 28 through the pipe 27. Since the piston area, larger than the area of the upper seat 33 of the outlet, the resultant force is downward, lowers the rod 22, transferring pressure through the outer 20 and inner 21 piston sections, while the outer section presses the disk 23 through the stops 25. After the disc is detached from the seats of the upper saddle, the exhaust of compressed air from the exciter 6 oscillations through the opening 31, upper saddle 33 and exhaust openings 30 begins.

As the sections are lowered, the volume increment rate of the control

chamber 28 becomes less than the air pressure increment of c. therefore, the speed of lowering the stock drops.

After the outer section of the piston lia stops, the slider 24 stops moving only under air pressure to the internal section of the piston. Since the diameter of the inner section D is larger than the diameter of the saddle of the inlet orifice d, the stem continues to descend; however, as the gap between the disk 23 and the lower seat 32 decreases, the resistance of the lowering of the rod increases, the lowering speed drops when the disk 23 hits the lower seats 32 of the part Valves are not deformed.

At the moment of exhaust from the pneumatic valve 15, the hammer 4 rises upward at high speed and the buffer elements 5 hits the bottom of the movable frame 3. At the moment of impact, the electric unit commands the valve 15 to switch to the intake mode, the compressed air from the control chamber exhausts and the cycle repeats .

In order to ensure effective operation of the pneumatic valve 15, the nozzle 27 of the control chamber 28 is provided with a bore adjuster 26, which is set so that, with a minimum cross section of the nozzle 27, the valve works stably. At the same time, the rate of change of volume of control chamber 28 during intake and. the air release should exceed the rate of change of air pressure in it.

The use of the proposed invention will improve the operating efficiency of the vibrating plate, will facilitate the adjustment of vibration parameters, will increase the efficiency and quality of the compaction of the concrete mix.

Claims (1)

Invention Formula The vibroplatform on the autor. No. 1260195, characterized in that, in order to reduce energy intensity and intensify the compaction process, the pneumatic valve of the exciter of vertical directional oscillations is designed as a piston installed from the center and downwardly movable relative to each other with an annular abutment mounted in the housing with upper and lower seats. the inner section and fixed. on the piston rod of the disk in contact with the seats, and the diameter of the inner section of the piston exceeds the maximum diameter of the lower seat. 0g / 29 Phie.