CN202438677U - Active on-off type non return valve - Google Patents
Active on-off type non return valve Download PDFInfo
- Publication number
- CN202438677U CN202438677U CN 201120364499 CN201120364499U CN202438677U CN 202438677 U CN202438677 U CN 202438677U CN 201120364499 CN201120364499 CN 201120364499 CN 201120364499 U CN201120364499 U CN 201120364499U CN 202438677 U CN202438677 U CN 202438677U
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- valve
- valve core
- return valve
- non return
- supercharging
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Abstract
The utility model relates to an active on-off type non return valve arranged in an injection system of a die casting machine. The active on-off type non return valve includes a valve seat, a non return valve core, a bearing sleeve, a switch valve core, a pilot valve, a control valve cover and a pressure spring. The non return valve core can slide along the inner wall of the switch valve core, and the bearing seat takes a guiding effect on the non return valve core. When a fast injection is carried out, the one return valve 4.2 is rapidly opened under the effect of the pilot valve 4.5, voltol oil directly flows into the rear cavity of an injection chamber through the gap between the valve seat 4.1 and the non return valve core 4.2 without the need for passing through other control valves, thus, the flow channel is shortened, the bottleneck of the flowing section is prevented, and the fast injection speed is improved. When the supercharging is carried out, oil accesses to the rear cavity of a pressure cylinder, and the gap between the valve seat 4.1 and the non return valve core 4.2 is closed immediately, thereby realizing the supercharging. The active on-off type non return valve provided achieves the duel effects of realizing the fast injection of the injection system and reducing the supercharging and pressure building time to improve the injection performance of the die casting machine. The active on-off type non return valve can be widely applied to the injection system of an extruder.
Description
Technical field
The utility model patent relates to die casting machine/extruder hydraulic pressure injection system, through the fast shot speed that active open-close type check valve improves injection system is set, shortens building the pressure time of supercharging, improves the injection performance index of injection machine.
Background technology
Injection system is the very important part of die casting machine, and the height of its performance is one of key factor of decision die casting machine quality.Improving fast shot speed is to improve injection system overall performance major measure with the pressure time of building of reducing supercharging.In current injection system, during fast shot, two-speed hydraulic oil need pass through the gap between floating piston and the charged piston bar, and the passage in this place ahead, gap gets into the back cavity of shot sleeve, completion fast shot process.Realize in the gap that need seal during supercharging between floating piston and the charged piston bar.If will improve fast shot speed; Then need increase the gap between floating piston and the charged piston bar; Reduce the flow resistance of two-speed pressure oil, build the time that floating piston and charged piston bar gap seal when pressing, promptly prolonged building the pressure time of supercharging but will certainly prolong supercharging like this.Therefore improving fast shot speed and reducing supercharging and build pressure and need reasonably allocate between the time, just can reach optimum effect.Chinese patent 200810020382.9 relates to a kind of vertical pressure charging press-shoot system, and this system has obtained good effect improving fast shot speed and reduce the supercharging pressure of founding a capital aspect the time.But two-speed accumulator hydraulic oil must be through a two-speed proportioning valve in this system; Flow into the shot sleeve back cavity through several honeycomb holes on the big latus rectum check valve body again; Runner is still longer, and also there is certain resistance in the honeycomb hole hydraulic fluid port, and there is decline to a certain degree in oil pressure.
Summary of the invention
The objective of the invention is to overcome the deficiency of existing patented technology, for vertical injection system provides a kind of active open-close type check valve, it is long to be intended to solve fast shot system hydraulic oil runner, and the oil pressure pressure drop is big, reduces injection speed, and the problem of pressing the response time is built in influence.
The object of the invention is realized through following technical scheme:
Initiatively the open-close type check valve is mainly by valve seat, nonreturn valve core, bearing holder (housing, cover), switch spool, pilot valve, and application valve cover and stage clip are formed.Nonreturn valve core can slide along the inwall of switch spool, and bearing block also plays guide effect to nonreturn valve core.Pilot valve 4.5 is these control modules that initiatively open and close check valve group 4.When the fast shot system does not work; Control oil acts on the switch spool 4.4 through pilot valve 4.5 and application valve cover 4.6; Switch spool 4.4 is used in masterpiece on the nonreturn valve core 4.2 again, and nonreturn valve core 4.2 is controlled active force oily and that stage clip 4.7 makes progress simultaneously, and whole valve closes dead.When fast shot starts; Pilot valve 4.5 switching-overs, 4.4 times end pressures of switch spool remove, and nonreturn valve core is opened under two-speed supercharging accumulator 1 oil pressure and nonreturn valve core 4.2 deadweight effects; I.e. open check valve initiatively; Hydraulic oil in the two-speed accumulator 1 directly gets into injection chamber back cavity 7 through the gap between nonreturn valve core and the valve seat without control valve, accomplishes the fast shot action.During supercharging, pressurized cylinder 5 lower end oil-feeds, utilize the charged piston bar up and down the difference of area make with the charged piston bar on the oil pressure of end in contact raise, promptly the oil pressure in the shot sleeve back cavity 7 improve; Nonreturn valve core 4.2 lower end oil pressure raise rapidly simultaneously, and the upper end oil pressure is constant, initiatively closes check valve, accomplish pressurization.
Substantive distinguishing features and obvious improvement that patent of the present invention is outstanding are mainly reflected in: 1. two-speed pressure oil need not through the two-speed proportioning valve; Directly get into the shot sleeve back cavity through the gap between nonreturn valve core and the valve seat; Cancelled cellular hydraulic fluid port again, both shortened runner, eliminated again and crossed oily cross section bottleneck; Reduce the pressure drop of oil pressure, improved fast shot speed; 2. check valve assembly is vertically placed, and after the oil pressure of switch spool lower end was laid down, nonreturn valve core was opened rapidly under the acting in conjunction of two-speed pressure oil and check valve deadweight, can promote fast shot speed; 3. during supercharging, this check valve is similar to common check valve, and shot sleeve back cavity oil pressure is closed the gap between valve seat and the nonreturn valve core after raising immediately, can realize supercharging rapidly, has shortened building the pressure time of supercharging.
So the present invention has improved the speed of the fast shot of injection system, shortened building the pressure time of supercharging again, finally improved the injection performance indications of die casting machine.
Description of drawings
Accompanying drawing 1 is the vertical pressure charging system of band active open-close type check valve, and accompanying drawing 2 is the thin portion structure of active open-close type check valve group 4.
1 uses accumulator for the two-speed supercharging among Fig. 1, and 2 is the back pressure accumulator, and 3 are supercharging oil-feed switch valve, and 4 be open-close type check valve group initiatively, and 5 is pressurized cylinder, and 6 is the supercharging servo valve, 7 shot sleeve back cavities.
In order to specify main points of the present invention, the formal specification that in accompanying drawing 2, amplifies with the part the thin portion structure of open-close type check valve group 4 initiatively.Wherein 4.1 is valve seat, and 4.2 is nonreturn valve core, and 4.3 is bearing holder (housing, cover), and 4.4 is the switch spool, and 4.5 is pilot valve, and 4.6 is application valve cover, and 4.7 is stage clip.
The specific embodiment
During energy storage; Control oil acts on the switch spool 4.4 with application valve cover 4.6 through pilot valve 4.5 shown in Figure 2; Switch spool 4.4 under bearing holder (housing, cover) 4.3 is leading, is used for nonreturn valve core 4.2 with masterpiece again, and nonreturn valve core 4.2 moves upward rapidly under the acting in conjunction of control oil and stage clip 4.7; Close the gap between nonreturn valve core 4.2 and the valve seat 4.1, accomplish energy storage.Need to prove: in vertical direction, the projected area of switch spool 4.4 lower ends is greater than the projected area of nonreturn valve core 4.2 upper ends, thereby the assurance check valve can be closed reliably.
During fast shot; Pilot valve 4.6 switching-overs; The oil pressure of switch spool 4.4 lower ends is cancelled; Nonreturn valve core 4.2 moves down under the acting in conjunction of two-speed supercharging with pressure oil in the accumulator 1 and check valve 4.2 deadweights, and pressure oil flows into the shot sleeve back cavity fast through the gap between valve seat 4.1 and the nonreturn valve core 4.2, accomplishes the fast shot action.
During supercharging, as shown in Figure 1, pressurized cylinder 5 back cavity oil-feeds; It is up to promote the charged piston bar, because of the upper end area of piston rod less than the lower end area, make shot sleeve back cavity 7 oil pressure increase sharply; This moment, nonreturn valve core was closed rapidly under the impact of hydraulic oil, accomplished pressurization.Back pressure accumulator 2 can be regulated boost pressure with 6 actings in conjunction of supercharging servo valve.
Claims (3)
1. open-close type check valve initiatively; It is characterized in that: said active open-close type check valve is mainly by valve seat, nonreturn valve core, bearing holder (housing, cover), switch spool, pilot valve; Application valve cover and stage clip are formed; Nonreturn valve core can slide along the inwall of switch spool, and bearing block also plays guide effect to nonreturn valve core.
2. active open-close type check valve according to claim 1 is characterized in that: when fast shot starts, and the pilot valve switching-over; Switch spool lower end pressure removes; Nonreturn valve core is opened under two-speed supercharging accumulator oil pressure and nonreturn valve core deadweight effect, i.e. open check valve initiatively, and the hydraulic oil in the two-speed accumulator is without control valve; Directly get into the injection chamber back cavity, accomplish the fast shot action through the gap between nonreturn valve core and the valve seat.
3. active open-close type check valve according to claim 1; It is characterized in that: during supercharging; The oil-feed of pressurized cylinder lower end, utilize the charged piston bar up and down the difference of area make with the charged piston bar on the oil pressure of end in contact raise, promptly the oil pressure in the shot sleeve back cavity improves; Nonreturn valve core lower end oil pressure raises rapidly simultaneously, and the upper end oil pressure is constant, initiatively closes check valve, accomplishes pressurization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120364499 CN202438677U (en) | 2011-09-27 | 2011-09-27 | Active on-off type non return valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120364499 CN202438677U (en) | 2011-09-27 | 2011-09-27 | Active on-off type non return valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202438677U true CN202438677U (en) | 2012-09-19 |
Family
ID=46820132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120364499 Expired - Lifetime CN202438677U (en) | 2011-09-27 | 2011-09-27 | Active on-off type non return valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202438677U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111094759A (en) * | 2017-08-30 | 2020-05-01 | Smc 株式会社 | Supercharging device |
| CN114309529A (en) * | 2022-01-19 | 2022-04-12 | 韶关市威劲星光机械科技有限公司 | Novel vertical cold chamber die casting machine |
-
2011
- 2011-09-27 CN CN 201120364499 patent/CN202438677U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111094759A (en) * | 2017-08-30 | 2020-05-01 | Smc 株式会社 | Supercharging device |
| CN111094759B (en) * | 2017-08-30 | 2021-11-05 | Smc 株式会社 | Supercharging device |
| CN114309529A (en) * | 2022-01-19 | 2022-04-12 | 韶关市威劲星光机械科技有限公司 | Novel vertical cold chamber die casting machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120919 |