SU973216A1 - Multishoe vibration press head - Google Patents

Description

one

The invention relates to foundry, in particular, to equipment for compacting molding sand in the manufacture of casting molds.

A multi-plunger press head is known, which includes a block of communicated cylinders with plungers, at the ends of which there are press blocks, and a cylinder with a floating piston connected to the block of communicated cylinders with plungers fll.

The disadvantage of this design is the reduced efficiency due to the static form of application of the load to the compacted mixture.

A multi-die press head is known, comprising a block of communicating cylinders with plungers, at the ends of which press jaws 2 are located.

The disadvantage of this design is the difficulty of controlling the operating modes of loading the mixture to be compacted.

Closest to the proposed technical entity is a multi-plunger press head comprising a housing in which piston actuators are vertically arranged, the piston cavities of which are communicated by means of pipelines between themselves and each of which are connected to a constant pressure line, and mounted on the piston rod of said piston drive pads

A disadvantage of the prior art device is the low efficiency due to the increased energy consumption at

It is the application of a load of constant magnitude to the compacted mixture, as well as the lack of uniform distribution of the density of the mixture in the mold 20.

Claims (3)

The aim of the invention is to increase the productivity of a multi-pot vibropress head and improve the uniformity of the density distribution of the mixture in the mold. This goal is achieved by: - (TO a lot of hours to the vibropress head, comprising a housing with vertically arranged piston actuators, the piston cavities of which are connected by pipelines to each other and each of which is connected to the pressure line, and mounted on the piston rod of the piston actuators The pads are additionally equipped with a pressure pulsation control unit with a battery, a hydraulic lock, a check valve and a valve, and the piston cavities are connected to the pressure line through a check valve and The lock valve, the check valve and the hydraulic lock are also connected to the battery, and the rod end cavities are connected to each other and directly to the pressure line connected to the pressure pulsation control unit. The pressure pulsation control unit is made in the form of a housing with a spring-loaded ball located in it and connected to the pressure pulser. line and drain line. The drawing shows a semi-constructive scheme of a multi-drum vibropress head. The multi-die vibropress head includes body 1, piston drives 2, piston cavities 3 of which are connected to pressure line 4 through check valve 5 and hydraulic lock 6, between which battery 7 is located and rod rods 8 are connected to a pressure pulsation control unit comprising body E, in a larger axial bore 10 of which ball 11 is spring-loaded 12 and resting on the edge 13 formed by a larger axial bore 10 and a smaller axial bore 14, and in a bore of a larger diameter an annular recess 15 is made whose working edge with J is the overlap of the ball with the diametral plane of the ball soy dinene; a drain line 16. The operation of the multi-booster vibropress head is controlled by a hygrodistributor 17, a safety valve 18, and the working member acting on sergei 19 are pads 20 mounted on pins 21 with piston springs 22 with water 2. Multi-vibrator vibropress head works as follows. The working fluid is supplied to the pressure line k and through the check valve 5 fills the accumulator 7, and through the hydraulic lock 6 and the piston cavities 3 at the same time directly from the discharge line, the working fluid-. is provided in the rod end 8 and the smaller axial bore 1 of the pressure pulsation control unit. Due to the difference in the areas of the plunger 3 and the rod 8 cavities under the action of fluid pressure, the pads 20 of the piston drive 2 fall down and seal the upper layer of the molding sand 19, and the clamping force can be adjusted using a safety valve 18. At the same time, The compacted mixture, in order to reduce the internal friction forces, uses a pressure pulsation control unit, the principle of action of which is as follows. Rod cavities 8 are constantly communicated with a smaller axial bore 14, which periodically automatically connects to drain line 16, unloading the rod cavity 8 (decreasing the pressure in it periodically to almost zero) and thus creating a cyclic load on the rods 21. Operation of the control unit pressure pulsations (pulsator valve) are performed as follows. The pressure of the working fluid supplied from the pressure line C affects the area of the axial bore 14 of smaller diameter on the ball 11, squeezing it from the saddle along the edge 13, then the pressure. the fluid acts over the entire diametral area of the ball, which leads to a sharp increase in the force on the ball and its displacement by an amount greater than the overlap. An axial bore 14 therefore joins the pressure line 4 and the rod end 8 with the drain line 1b. The response pressure of the pulsation control unit is controlled by a spring 12. To maintain the adjusting pressure, at the time of the pressure pulsation control unit, the accumulator 7 serves in the piston cavities 7. the check valve 5 and the hydraulic box 6. After the compaction of the molding sand 19 is completed, the valve 17 switches to left position, connecting pressure line C with a piston cavity of the hydraulic lock 6, opened it and connected the piston 3 and the rod 8 cavities of the piston drive 2 with the drain. The lifting of the pads 20 with the rods 21 is carried out by springs 22. The use of the proposed multi-die vibropress head allows increasing its productivity by 25%, as well as expanding the range of its operating parameters. Claim 1. A multi-drum vibropress head comprising a housing with vertically disposed piston actuators, the piston cavities of which are connected by pipelines to each other and each of which is connected to a pressure line, and which are installed on the piston-piston actuator rods, increase the uniformity of distribution of the density of the mixture in the mold and increase the productivity of the head; it is additionally equipped with a pressure pulsation control unit, a battery, and Droslock, non-return valve and control valve, the piston cavities are connected to the pressure line through a check valve and the hydraulic lock, the check valve and hydraulic lock are also connected to the battery, and the rod cavities are connected to each other and directly to the pressure line connected to the pressure pulsation control unit. 2. Pop 1 head, characterized in that the pressure pulsation control unit is made in the form of a housing with a spring-loaded ball located in it and connected to a pressure line and a drain line. Sources of information taken into account during the examination 1. USSR author's certificate V 5272kk, cl. In 22 C 15/02, 19752. Author's certificate of the USSR ff 653022, cl. B 22 C 15/02, 1965. 3. Author's certificate of the USSR N 6160i 1, cl. B 22 C 15/08, 1977.