CN201579357U - Overpressure prevention device of electro-hydraulic hammer accumulator - Google Patents
Overpressure prevention device of electro-hydraulic hammer accumulator Download PDFInfo
- Publication number
- CN201579357U CN201579357U CN200920318309XU CN200920318309U CN201579357U CN 201579357 U CN201579357 U CN 201579357U CN 200920318309X U CN200920318309X U CN 200920318309XU CN 200920318309 U CN200920318309 U CN 200920318309U CN 201579357 U CN201579357 U CN 201579357U
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- accumulator
- accumulators
- hammer
- oil
- control valve
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Abstract
The utility model discloses an overpressure prevention device of an electro-hydraulic hammer accumulator, which comprises a main cylinder (1) of an electro-hydraulic hammer and oil pumps (6), wherein a piston head (2) is arranged in the main cylinder (1), a hammer rod (3) is arranged on the piston head (2) in a connecting way, the lower cavity of the main cylinder (1) is connected with a control valve (4) which is connected with accumulators (5) through oil pipes, and the oil pumps (6) are connected with the accumulators (5) and the control valve (4) through oil pipes. The number of the accumulators is two, and the upper ends of the cavities of the accumulators are connected with the same air cavity; the lengths of the two accumulators are different, and the short accumulator is connected with a travel switch; the travel switch is connected with a control circuit of the oil pump, thereby ensuring that pistons move up and down synchronously in the movement process of the accumulator pistons; and when the short accumulator piston moves to the top, all oil pumps enter the unloading state, and the phenomenon that the upper cavity of the long accumulator always has a larger air chamber space when stopping hammer blow rapidly can be ensured so as to play the buffering role.
Description
Technical field
The utility model relates to a kind of electric liquid hammer, particularly a kind of electric liquid hammer accumulator superpressure preventing device.
Background technology
The electricity liquid hammer is a kind of novel forging equipment of energy-saving and environmental protection, and electric liquid hammer is fast because of its response, reliability is high is subjected to the attention of many countries and is developed.Hydraulic principle such as Fig. 2 of electricity liquid hammer, be the system that a constant displacement pump adds accumulator combination fuel feeding, when carrying hammer, control valve is opened, oil pump and accumulator are simultaneously to master cylinder cavity of resorption fuel feeding, control valve is closed when playing hammer, and the fluid of oil pump output can only enter the accumulator cavity of resorption, when the tup break-off, accumulator piston constantly rises, up to touching travel switch, send the signal of fuel cut-off by travel switch, by the off-load of electromagnetic relief valve control oil pump.Such system, accumulator does not allow to rush to summit, and its reason has several respects: if 1, accumulator piston rushes to summit, and will force electromagnetic relief valve to open overflow, its setting pressure is higher usually, and fluid can a large amount of heatings under the overflow situation.Formed pressure oscillation was very big when 2, piston was rushed to summit, and will work the mischief to system element and pipeline.If 3, executive component tup anxious hammer of receiving when descending needs partly fluid and flows backwards back accumulator cushioning, if accumulator was in oil and expired state this moment, then the impact that brought of the huge inertia of tup will directly cause element destruction.Therefore at the top of accumulator a travel switch being set all generally controls the oil pump off-load.But for the large-tonnage forging hammer, such control mode often lost efficacy, structure near switch is limit, and its operating distance is comparatively limited, and the action of its control off-load has certain hysteresis, when flow system flow is very large, tend to cause the problem of rushing to summit.
The utility model content
The technical problems to be solved in the utility model is: a kind of anxious safety of receiving each position member when hammering into shape that guarantees is provided, prevent impacting with high pressure, increase the electric liquid hammer accumulator superpressure preventing device of parts working lives such as master cylinder, control valve, can overcome the deficiencies in the prior art.
The technical solution of the utility model: a kind of electric liquid hammer accumulator superpressure preventing device, it comprises the master cylinder and the oil pump of electric liquid hammer, in master cylinder, be provided with piston head, on piston head, be connected with hammer stem, cavity of resorption at master cylinder is connected with control valve, control valve is connected with accumulator by oil pipe, oil pump is by oil pipe and accumulator and control connection, the quantity of accumulator is two, the chamber upper end of two accumulators is connected with same air chamber, and the length difference of two accumulators is connected with travel switch on short accumulator, travel switch is connected with the control circuit of oil pump.
Compared with the prior art, the utility model is made as two with the quantity of accumulator, the chamber upper end of two accumulators is connected with same air chamber, and the length difference of two accumulators, on short accumulator, be connected with travel switch, travel switch is connected with the control circuit of oil pump, just can guarantee in the accumulator piston motion process that like this two accumulator piston move up and down synchronously; Travel switch is contained on the short accumulator, its short accumulator piston is during to the top, and all oil pumps change unloading condition over to, have guaranteed that anxious the receipts when hammering into shape long accumulator epicoele always has bigger air chamber space, play cushioning effect, thereby can prevent effectively that parts such as master cylinder, control valve are subjected to the damage of impacting with high pressure.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
The specific embodiment
Embodiment: as shown in Figure 1, in master cylinder 1, be provided with piston head 2, on piston head 2, be connected with hammer stem 3, cavity of resorption at master cylinder 1 is connected with control valve 4, control valve 4 is connected with accumulator 5 by oil pipe, oil pump 6 is connected with control 4 with accumulator 5 by oil pipe, the quantity of accumulator 5 is two in this example, the chamber upper end of two accumulators 5 is connected with same air chamber 7 by pipeline, and the length difference of two accumulators 5, be connected with travel switch 8 on short accumulator 5, travel switch 8 is connected with the control circuit of oil pump 6.The hydraulic principle of electricity liquid hammer is, it is the system that a quantitative oil pump 6 adds two accumulators, 5 combination fuel feeding, when carrying hammer, control valve 4 is opened, oil pump 6 and accumulator 5 are simultaneously to master cylinder 1 cavity of resorption fuel feeding, control valve 4 is closed when playing hammer, the fluid of oil pump 6 outputs can only enter two accumulator 5 cavity of resorptions, when the tup break-off, accumulator 5 pistons constantly rise, piston up to short accumulator 5 touches travel switch, sends the signal of fuel cut-off by travel switch, by 6 off-loads of electromagnetic relief valve control oil pump.
Claims (1)
1. electric liquid hammer accumulator superpressure preventing device, it comprises the master cylinder (1) and the oil pump (6) of electric liquid hammer, in master cylinder (1), be provided with piston head (2), on piston head (2), be connected with hammer stem (3), cavity of resorption at master cylinder (1) is connected with control valve (4), control valve (4) is connected with accumulator (5) by oil pipe, oil pump (6) is connected with control valve (4) with accumulator (5) by oil pipe, it is characterized in that: the quantity of accumulator (5) is two, the chamber upper end of two accumulators (5) is connected with same air chamber (7), and the length difference of two accumulators (5), be connected with travel switch (8) on short accumulator (5), travel switch (8) is connected with the control circuit of oil pump (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920318309XU CN201579357U (en) | 2009-12-23 | 2009-12-23 | Overpressure prevention device of electro-hydraulic hammer accumulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920318309XU CN201579357U (en) | 2009-12-23 | 2009-12-23 | Overpressure prevention device of electro-hydraulic hammer accumulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201579357U true CN201579357U (en) | 2010-09-15 |
Family
ID=42721349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920318309XU Expired - Fee Related CN201579357U (en) | 2009-12-23 | 2009-12-23 | Overpressure prevention device of electro-hydraulic hammer accumulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201579357U (en) |
-
2009
- 2009-12-23 CN CN200920318309XU patent/CN201579357U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20131223 |