CN201124584Y

CN201124584Y - Back pressure adjusting apparatus for press ram

Info

Publication number: CN201124584Y
Application number: CNU2007200308592U
Authority: CN
Inventors: 叶朝晖; 杜红英
Original assignee: Jier Machine Tool Group Co Ltd
Current assignee: Jier Machine Tool Group Co Ltd
Priority date: 2007-11-21
Filing date: 2007-11-21
Publication date: 2008-10-01
Anticipated expiration: 2017-11-21

Abstract

The utility model relates to a press machine sliding block back pressure adjusting device which comprises a pneumatic pump and an unloading valve connected with an electric pump. The device is characterized in that two groups of valve bodies are connected in series between the pneumatic pump and the unloading valve, the valve bodes are proportional valves and pressure adjusting valves connected in parallel, a pressure sensor is arranged in front of the proportional valve, a normally-open electromagnetic valve is arranged in front of one group of the valve bodies near the unloading valve, a normally-closed electromagnetic valve is arranged in front of the group of the valve bodies near the pneumatic pump, the two groups of the valve bodies are connected with the air source. The device has the advantages that the device is improved only in the controlling part of the air channel with no changes in the structure of the press machine, thus being applicable to all gas/liquid balanced unloading valves, and greatly widening the application range of the press machine; the device has great benefit for protecting the mould, controlling the technology force and improving the stability of the work pieces; the device also has the advantages of simple structure, convenient operation and suitability for popularization and application.

Description

Press ram back pressure adjusting device

(1) technical field

The utility model relates to forcing press parts technical field, particularly a kind of press ram back pressure adjusting device.

(2) background technology

In the course of work of punching machine, the tonnage of forcing press can be adjusted according to the needs of different process power, and this need realize by the air pressure adjustment of its slide block unloader.General employing is on the air inlet pipeline of unloader pressure regulator valve to be installed at present, realize by manual adjustment of press operation personnel, though this method is simple, cheap, but need calculate corresponding atmospheric pressure value according to required tonnage, in case calculate or operate miss, can overload by the build-up of pressure machine, and this method efficient is low, can't realize the requirement of automated production.

(3) summary of the invention

There is circumscribed problem in the utility model in order to solve manual adjustment of slide block back pressure, provides a kind of and can realize that the slide block back pressure is controlled automatically and the press ram back pressure adjusting device of adjusting.

The utility model is realized by following measure: a kind of press ram back pressure adjusting device, comprise air driven pump, the unloader that links to each other with electrodynamic pump, it is characterized in that: be in series with two groups of valve bodies between air driven pump and the unloader, described valve body is proportioning valve and a pressure regulator valve in parallel, the proportioning valve front is provided with pressure sensor, one group of valve body front near unloader is provided with the normal open magnetic valve, and that group valve body front of close air driven pump is provided with normally closed magnet valve, and two groups of valve bodies all link to each other with source of the gas.

The beneficial effects of the utility model:

1. do not need to change the structure of forcing press, only the control section to gas circuit is improved, and is all suitable to the unloader of all gas liquid type balances, improves the scope of application of forcing press greatly, to the protection mould, and control technology power, the stability that improves workpiece has very big benefit;

2. simple in structure, easy to operate, suitable applying.

(4) description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is a structural representation of the present utility model.

1. pressure sensors among the figure, 2. normal open magnetic valve, 3. pressure regulator valve, 4. normally closed magnet valve, 5 unloaders, 6 air driven pumps, 7 proportioning valves, 8 pipe valve valves.

(5) specific embodiment

A kind of press ram back pressure adjusting device as shown in Figure 1, the unloader 5 that comprise air driven pump 6, links to each other with electrodynamic pump, be in series with two groups of valve bodies between air driven pump 6 and the unloader 5, described valve body is proportioning valve 7 and a pressure regulator valve 3 in parallel, proportioning valve 7 fronts are provided with pressure sensor 1, one group of valve body front near unloader 5 is provided with normal open magnetic valve 2, and that group valve body front of close air driven pump 6 is provided with 4, two groups of valve bodies of normally closed magnet valve and all links to each other with source of the gas.

During use, earlier with mould number input PLC, by the air inlet and the exhaust of pressure sensor 1 and proportioning valve 7 control unloaders 5, in the forcing press use, can change the control air pressure of unloader 5 easily by the mode of electrical control, realize the setting of the different tonnages of forcing press.

Unloader is adjusted:

1. when needs adopt unloader 7 back pressures to adjust automatically, the pipe valve valve 8 of closing pressure regulator valve 3 and front.

2. during operate as normal, proportioning valve 7 is a normal open state, and bleed pressure is by this proportioning valve 7, again by a two-bit triplet normal open magnetic valve 2 to unloader 5, form back pressure.

3. when needs were adjusted, the pressure sensor 1 by on these proportioning valve 7 paths linked to each other with electrical control, determined the break-make of proportioning valve 7 automatically, raise or reduced air pressure on this path, thereby reach the effect of adjusting back pressure.

Precompression is adjusted:

1. when needs adopt precompression to adjust automatically, the pipe valve valve 8 of closing pressure regulator valve 3 and front.

2. before the operate as normal, proportioning valve 7 is a normal open state, and bleed pressure to air driven pump 6, forms precompression by a two-bit triplet normally closed solenoid valve 4 (this valve energising this moment) again by this proportioning valve 7.After reaching precompression, normally closed solenoid valve 4 outages.

3. when needs were adjusted, the pressure sensor 1 by on these proportioning valve 7 paths linked to each other with electrical control, automatically determine the break-make of proportioning valve 7, raise or reduce air pressure on this path, thereby reach the effect of adjusting precompression, during adjustment, normally closed magnet valve 4 is a "on" position; The pressure regulator valve 7 of air inlet place is set at the required maximum pressure of system.

Claims

1. press ram back pressure adjusting device, the unloader (5) that comprise air driven pump (6), links to each other with electrodynamic pump, it is characterized in that: be in series with two groups of valve bodies between air driven pump (6) and the unloader (5), described valve body is proportioning valve (7) and a pressure regulator valve (3) in parallel, proportioning valve (7) front is provided with pressure sensor, one group of valve body front near unloader (5) is provided with normal open magnetic valve (2), that group valve body front near air driven pump (6) is provided with normally closed magnet valve (4), and two groups of valve bodies all link to each other with source of the gas.