CN1165082A - Step-by-step pressure reduction type hot press - Google Patents
Step-by-step pressure reduction type hot press Download PDFInfo
- Publication number
- CN1165082A CN1165082A CN 96106252 CN96106252A CN1165082A CN 1165082 A CN1165082 A CN 1165082A CN 96106252 CN96106252 CN 96106252 CN 96106252 A CN96106252 A CN 96106252A CN 1165082 A CN1165082 A CN 1165082A
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- CN
- China
- Prior art keywords
- pressure
- hot press
- oil
- pressure reduction
- reduction type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
Abstract
A thermal press able to depress gradually for pressing building plates features that a pressure-relief valve is used between cylinder and check valve in hydraulic system for supply oil to cylinder. After press plate reaches working pressure, its pressure is slowly relieved, preventing the generation of defects caused by relieving pressure quickly.
Description
The invention belongs to pressure rolling machinery, hot press technical field.
The existing hot press that is used to suppress various building boards is to drive top board by the piston that hydraulic oil orders about oil cylinder to move downward, and makes material be pressed moulding between upper and lower pressing plate.The weak point that this hot press exists is: behind the oil pump fuel cut-off, top board is too fast to the unloading of pressboard, so that the fibrous elasticity of material and the gas bag between the material are not eliminated as yet, in case top board leaves material, compressed gas bag quicks rebound in the elastic force of fiber and the body, cause sheet material skip floor and decortication, have a strong impact on the quality of product.
Purpose of the present invention influences the defective of product quality too soon and a kind of hot press that top board is slowly unloaded is provided in order to overcome existing hot press unloading just.
The present invention is achieved by the following technical solution:
A pressure-relief valve is being set in the hydraulic system of oil cylinder fuel feeding, and this pressure-relief valve is connected on the oil pipe between oil cylinder and the unidirectional pilot operated valve device, and when needs unloaded, pressure-relief valve unlatching work progressively unloaded the hydraulic pressure of oil cylinder.
Further set forth content of the present invention below in conjunction with Figure of description and embodiment.
Drawing reference numeral is: 1-top board 2-lower platen 3-oil cylinder 4-piston rod 5-oil pipe 6-pressure-relief valve 7-check valve 8-reversal valve 9-oil pump 10-oil sump 11-lift valve
Present embodiment lower platen 2 is fixed on the ground surface platform, and top board 1 is by column or frame supported, and oil cylinder 3 and piston rod 4 connect and promote top board with top board 1 works downwards.The hydraulic oil of oil cylinder is entered along oil pipe 5 by check valve 7 through reversal valve 8 by oil pump 9 again, and pressure-relief valve places between the oil cylinder and check valve of hydraulic system, and it unloads head piece and oil sump 10 is connected.When operating pressure finished, check valve 7 was not opened, and progressively release was four seconds by closing to the full open time for example to the hydraulic oil that oil cylinder is 3 li by the slow unlatching of hydraulic valve 6.The oil that flows out through pressure-relief valve 6 is back in the oil sump 10.In-oil cylinder operating pressure oil is all after the releases, and the lifting of top board 1 is bought oil by elevator pump 11 and entered oil cylinder and make it be returned to initial position.
The present invention compared with prior art, it is slow to have the top board of a making release, Guarantee to be pressed fibrous elasticity and interior coated the disposing of air of plate body of sheet material, Make the not affected obvious advantage of quality of product.
Claims (2)
1, a kind of hot press of step-by-step pressure reduction type is formed by pressing plate, oil cylinder and by the hydraulic system that check valve, reversal valve and oil pump form.It is characterized in that: in hydraulic system, also be provided with a pressure-relief valve.
2, according to the described hot press of claim 1, it is characterized in that: pressure-relief valve is arranged on the oil pipe that connects between oil cylinder 2 and the check valve 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96106252 CN1165082A (en) | 1996-05-10 | 1996-05-10 | Step-by-step pressure reduction type hot press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96106252 CN1165082A (en) | 1996-05-10 | 1996-05-10 | Step-by-step pressure reduction type hot press |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1165082A true CN1165082A (en) | 1997-11-19 |
Family
ID=5119035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96106252 Pending CN1165082A (en) | 1996-05-10 | 1996-05-10 | Step-by-step pressure reduction type hot press |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1165082A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102259384A (en) * | 2011-05-10 | 2011-11-30 | 江苏德一新型建筑材料科技有限公司 | Vibrated compression device |
-
1996
- 1996-05-10 CN CN 96106252 patent/CN1165082A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102259384A (en) * | 2011-05-10 | 2011-11-30 | 江苏德一新型建筑材料科技有限公司 | Vibrated compression device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |