CN220396134U - Hydraulic system of double-net pulp squeezer - Google Patents
Hydraulic system of double-net pulp squeezer Download PDFInfo
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- CN220396134U CN220396134U CN202322023660.9U CN202322023660U CN220396134U CN 220396134 U CN220396134 U CN 220396134U CN 202322023660 U CN202322023660 U CN 202322023660U CN 220396134 U CN220396134 U CN 220396134U
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 110
- 238000001125 extrusion Methods 0.000 claims description 22
- 239000002002 slurry Substances 0.000 abstract description 29
- 230000008859 change Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 137
- 239000010720 hydraulic oil Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to a hydraulic system of a twin-wire press, comprising: the hydraulic station, at least two adjusting cylinders, a first reversing valve and a first adjusting valve group; the two oil drain ports of the first reversing valve are respectively communicated with rod cavities and rodless cavities of at least two adjusting oil cylinders, and the oil return port is communicated with the oil return port of the hydraulic station; the oil inlet of the first regulating valve group is communicated with an oil drain port of the hydraulic station, the oil drain port is communicated with an oil inlet of the first reversing valve, and the oil return port is communicated with the hydraulic station. According to the utility model, through the cooperation of the first regulating valve group and the first reversing valve, the length of the piston rod of the regulating cylinder can be regulated, and when the slurry amount is changed, the oil supply pressure of the regulating cylinder can be regulated through the first regulating valve group, so that the length of the piston rod of the regulating cylinder is regulated, the interval between the squeeze rollers is regulated, the change of the slurry amount is adapted, and the squeeze rollers are prevented from being damaged.
Description
Technical Field
The utility model relates to the technical field of papermaking, in particular to a hydraulic system of a twin-wire press.
Background
The papermaking industry has now developed a centralized pulping, decentralized papermaking model in which the pulp mill is required to deliver the finished pulp to each mill, and the transportation of the pulp incurs significant transportation costs. Therefore, a double-net press-filter pulp extruder is required to extrude the pulp to form a pulp board so as to improve the concentration of the pulp and reduce the transportation cost.
In the prior art, a double-net filter pressing pulp extruder is often used for filtering and concentrating pulp, specifically, two filter screens are used for extruding the pulp, the distance between the two filter screens is adjusted through a plurality of groups of extrusion rollers, each group of extrusion rollers comprises an upper extrusion roller and a lower extrusion roller, and the distance between the two extrusion rollers is adjusted through an adjusting oil cylinder. After the interval between two filter screens and two squeeze rolls is confirmed, the position of the piston rod of the adjusting oil cylinder is fixed, the distance between the filter screens and the squeeze rolls can not be adjusted any more, when the sudden slurry is greatly increased, the slurry between the two filter screens is increased, the pressure between the two filter screens and the squeeze rolls is increased, the squeeze rolls are easy to break, serious equipment faults are caused, and the whole production line is stopped.
Therefore, a hydraulic system of the twin-wire press capable of finely adjusting the expansion and contraction amount of the piston rod of the adjusting cylinder is needed.
Disclosure of Invention
First, the technical problem to be solved
In view of the above-mentioned shortcomings and disadvantages of the prior art, the present utility model provides a hydraulic system of a twin-wire press, which solves the technical problem that the squeeze roll is broken due to the fact that the expansion and contraction amount of a piston rod of an adjusting cylinder of the adjusting squeeze roll cannot be finely adjusted in the prior art.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps:
a twin-wire press hydraulic system comprising a press roll, further comprising:
the at least two adjusting oil cylinders are respectively arranged at two ends of the extrusion roller;
a hydraulic station for supplying oil to the regulating cylinder;
the two oil drain ports of the first reversing valve are respectively communicated with the rod cavities and the rodless cavities of the at least two adjusting oil cylinders, the oil return port is communicated with the oil return port of the hydraulic station, and the first reversing valve is provided with a first state for supplying oil to the rod cavities of the adjusting oil cylinders and a second state for supplying oil to the rodless cavities of the adjusting oil cylinders;
the oil inlet of the first regulating valve group is communicated with an oil drain port of the hydraulic station, the oil drain port is communicated with an oil inlet of the first reversing valve, the overflow port is communicated with an oil return port of the hydraulic station, and the first regulating valve group is provided with a first working position and a second working position;
the oil supply pressure of the regulating oil cylinder, which is obtained by regulating the first regulating valve group at the second working position, is larger than the oil supply pressure of the regulating oil cylinder, which is obtained by regulating the first regulating valve group at the first working position;
the oil inlet of the second regulating valve group is communicated with the rod cavity of the regulating oil cylinder, and the oil drain port is communicated with the rodless cavity of the regulating oil cylinder;
the at least one energy accumulator is communicated with an oil drain port of the hydraulic station and an oil inlet of the first regulating valve group.
Preferably, the first regulating valve group comprises an overflow pressure reducing valve, an oil inlet of the overflow pressure reducing valve is communicated with an oil drain port of the hydraulic station, the oil drain port is communicated with the first reversing valve, and the overflow port is communicated with an oil return port of the hydraulic station.
Preferably, the first regulating valve group further comprises a first overflow valve, an oil inlet of the first overflow valve is communicated with an oil drain port of the overflow pressure reducing valve, and the oil drain port is communicated with an oil return port of the hydraulic station.
Preferably, the first regulating valve further comprises a second reversing valve, two oil inlets of the second reversing valve are respectively communicated with an oil drain port of the overflow pressure reducing valve and an oil return port of the hydraulic station, the oil drain port is communicated with the oil return port of the hydraulic station, and the second reversing valve has a first working state and a second working state;
when the second reversing valve is in a first working state, an oil return port of the overflow pressure reducing valve is communicated with an oil return port of a hydraulic station;
when the second reversing valve is in a second working state, an oil return port of the overflow pressure reducing valve is communicated with the first overflow valve.
Preferably, the second regulating valve group comprises a second overflow valve, an oil inlet of the second overflow valve is communicated with a rod cavity of the regulating oil cylinder, and an oil discharge port of the second overflow valve is communicated with a rodless cavity of the regulating oil cylinder.
Preferably, the second regulating valve group further comprises a one-way valve, an oil inlet end of the one-way valve is communicated with a rod cavity of the regulating oil cylinder, and an oil drain port is communicated with an oil inlet of the second overflow valve.
Preferably, the hydraulic system further comprises at least one stop valve, and the at least one stop valve is respectively arranged at the oil inlets of the at least one accumulator in a one-to-one correspondence manner.
Preferably, the hydraulic system further comprises a relief valve for preventing the hydraulic system from being excessively pressurized, and the relief valve is arranged at an oil drain port of the hydraulic station.
(III) beneficial effects
The beneficial effects of the utility model are as follows:
(1) According to the utility model, through the cooperation of the first regulating valve group and the first reversing valve, the length of the piston rod of the regulating cylinder can be regulated, and when the slurry amount is changed, the oil supply pressure of the regulating cylinder can be regulated through the first regulating valve group, so that the length of the piston rod of the regulating cylinder is regulated, the interval between the squeeze rollers is regulated, the change of the slurry amount is adapted, and the squeeze rollers are prevented from being damaged.
(2) According to the utility model, the second regulating valve group is matched with the first regulating valve group, when the slurry is suddenly increased and the pressure in the hydraulic system is increased, the second overflow valve is opened, so that hydraulic oil in a rod cavity of the regulating oil cylinder is rapidly discharged into a rodless cavity, the length of a piston rod of the regulating oil cylinder is rapidly regulated, the distance between squeeze rollers is regulated, and the squeeze rollers are prevented from being broken due to overlarge pressure between the squeeze rollers.
(3) According to the utility model, the pressure of the hydraulic system can be regulated through the overflow pressure reducing valve or the hydraulic pressure of the system can be regulated through the cooperation of the overflow pressure reducing valve and the first overflow valve, and the two regulation pressure regulation modes meet different pressure regulation requirements.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a hydraulic system of a twin-wire press according to the present utility model.
[ reference numerals description ]
1: an adjusting oil cylinder; 2: a pressure release valve; 3: a first reversing valve; 4: an overflow pressure reducing valve; 5: a first overflow valve; 6: a second reversing valve; 7: an accumulator; 8: a hydraulic station; 9: a stop valve; 10: a one-way valve; 11: and a second relief valve.
Detailed Description
The utility model will be better explained by the following detailed description of the embodiments with reference to the drawings.
Examples
In this embodiment, the twin-wire press has two filter screens and multiunit squeeze rolls, extrudes many times to the thick liquids, and every group includes two filter screens that arrange about or around, and the example is arranged about in this embodiment, and every group squeeze roll includes two squeeze rolls, and two squeeze rolls are arranged respectively on the top and the bottom of two upper and lower filter screens, and one of them upper filter screen and the bottom butt of last compression roller, the top butt of lower compression roller is pressed to the filter screen. The upper press roller and the lower press roller comprise press rollers, bearing seats and bearings; the lower press roll is fixed on a frame of the double-net pulp extruding machine through bearing seats at two ends, one side of the bearing seat at two ends of the upper press roll is hinged with one side of the bearing seat of the lower press roll, the other side of the bearing seat of the upper press roll is hinged with the adjusting oil cylinder 1, the other end of the adjusting oil cylinder 1 is hinged with the other side of the bearing seat of the lower press roll, and the distance between the two press rolls is adjusted through the expansion and contraction of a piston rod of the adjusting oil cylinder 1, so that constant pressure between two filter screens is ensured.
As shown in fig. 1, a hydraulic system of a twin-wire press comprises: the hydraulic station 8 is used for supplying oil to the adjusting cylinders 1, at least two adjusting cylinders 1, a first reversing valve 3 and a first adjusting valve group. The rod cavities of at least two adjusting oil cylinders 1 are communicated with each other, and the rodless cavities of at least two adjusting oil cylinders 1 are communicated with each other. One oil drain port of the first reversing valve 3 is communicated with rod cavities of at least two adjusting oil cylinders 1, the other oil drain port is communicated with rodless cavities of at least two adjusting oil cylinders 1, an oil return port is communicated with an oil return port of a hydraulic station 8, and the first reversing valve 3 has a first state and a second state. The oil inlet of first regulating valve group is linked together with the oil drain port of hydraulic pressure station 8, and the oil drain port is linked together with the oil inlet of first switching-over valve 3, and the oil return port is linked together with the oil return port of hydraulic pressure station 8, and first regulating valve group has the effect of the oil feed pressure of adjusting hydro-cylinder 1, and first regulating valve group has first operating position and second operating position, and first regulating valve group is in the oil feed pressure of adjusting hydro-cylinder 1 that first operating position and second operating position can obtain respectively different, and in this embodiment, the oil feed pressure of adjusting hydro-cylinder 1 that the second operating position obtained is greater than the oil feed pressure of adjusting hydro-cylinder 1 that first operating position obtained. When the first regulating valve group is in a first working position and the first reversing valve 3 is in a first state, the oil supply pressure of the rod cavity of the regulating oil cylinder 1 is regulated, so that the pressure of the rod cavity is kept constant; when the first regulating valve group is in a first working position and the first reversing valve 3 is in a second state, the oil supply pressure of the rodless cavity of the regulating oil cylinder 1 is regulated, so that the pressure of the rodless cavity is kept constant; when the first reversing valve 3 is in the first state, the oil supply pressure of the rod cavity of the adjusting oil cylinder 1 is adjusted, so that the pressure of the rod cavity is kept constant, but the pressure in the obtained rod cavity is larger than the pressure when the first reversing valve is in the first working position.
In this embodiment, the first reversing valve 3 is a two-position four-way reversing valve, and its initial position is the right position, that is, the first state. The two adjusting cylinders 1 are respectively arranged on the bearing seats at the two ends of the squeeze roller, and the lengths of the piston rods of the two adjusting cylinders 1 can be synchronously adjusted.
The hydraulic station 8 comprises, among other things, a tank, at least one hydraulic pump, a filter for filtering the hydraulic oil and a cooler for cooling the hydraulic oil.
Specifically, in the material extrusion process, the first regulating valve group is in a first working position, when the first reversing valve 3 is in a first state, when the slurry suddenly increases, the slurry extrudes two filter screens and the extrusion roller, the extrusion roller generates a reaction force to the piston rod of the regulating cylinder 1, so that the pressure in the rod cavity of the regulating cylinder 1 is increased, and the first regulating valve group reduces the pressure in the rod cavity of the regulating cylinder 1, so that the piston rod of the regulating cylinder 1 slightly stretches and is suitable for the suddenly increased slurry. Similarly, when the first regulating valve group is in the second working position and the first reversing valve 3 is in the first state, when the slurry suddenly increases, the slurry extrudes two filter screens and the extrusion roller, the extrusion roller generates a reaction force to the piston rod of the regulating oil cylinder 1, so that the pressure in the rod cavity of the regulating oil cylinder 1 is increased, and the pressure in the rod cavity of the regulating oil cylinder 1 is reduced by the first regulating valve group, so that the piston rod of the regulating oil cylinder 1 slightly stretches to adapt to the suddenly increased slurry.
In the prior art, two filter screens are often adopted to extrude slurry, the distance between the two filter screens is adjusted through a plurality of groups of extrusion rollers, each group of extrusion rollers comprises two extrusion rollers, and the distance between the two extrusion rollers is adjusted through an adjusting oil cylinder 1. After the interval between two filter screens and two squeeze rolls is confirmed, the position of the piston rod of the adjusting oil cylinder 1 is fixed, the distance between the filter screens and the squeeze rolls can not be adjusted any more, when the sudden slurry is greatly increased, the slurry passing through the two filter screens is increased, the pressure between the two filter screens and the squeeze rolls is increased, and the squeeze rolls are easily broken. The length of the piston rod of the adjusting cylinder 1 can be adjusted through the cooperation of the first adjusting valve group and the first reversing valve 3, and when the slurry amount is changed, the oil supply pressure of the adjusting cylinder 1 can be adjusted through the first adjusting valve group, so that the length of the piston rod of the adjusting cylinder 1 is adjusted, the distance between the squeeze rolls is adjusted, the change of the slurry amount is adapted, and the squeeze rolls are prevented from being damaged.
As shown in fig. 1, the first regulating valve group comprises an overflow pressure reducing valve 4, a first overflow valve 5 and a second reversing valve 6, an oil inlet of the overflow pressure reducing valve 4 is communicated with an oil drain of the hydraulic station 8, the oil drain is communicated with the first reversing valve 3, the overflow port is communicated with an oil return port of the hydraulic station 8, and the oil return port is communicated with an oil inlet of the first overflow valve 5 and an oil inlet of the second reversing valve 6. The oil drain port of the first overflow valve 5 is communicated with the oil return port of the hydraulic station 8. The two oil inlets of the second reversing valve 6 are respectively communicated with an oil drain port of the overflow pressure reducing valve 4 and an oil return port of the hydraulic station 8, the oil drain port is communicated with the oil return port of the hydraulic station 8, and the second reversing valve 6 has a first working state and a second working state; when the second reversing valve 6 is in the first working state, the oil return port of the overflow reducing valve 4 is communicated with the oil return port of the hydraulic station 8; when the second reversing valve 6 is in the second working state, the oil return port of the overflow reducing valve 4 is communicated with the first overflow valve 5.
Specifically, in this embodiment, the second reversing valve 6 is a two-position three-way reversing valve, and the initial position is the right position, that is, the first working state.
When the hydraulic oil pressure regulator is used, when the second reversing valve 6 is in the first working state, hydraulic oil is depressurized by the hydraulic pump 8 through the overflow pressure reducing valve 4 and flows into the regulating cylinder 1, and the oil return port of the overflow pressure reducing valve 4 discharges oil and returns to the oil return port of the hydraulic station 8 through the right bit stream of the second reversing valve 6. After the interval adjustment between the filter screens is completed, the filter screens extrude the slurry, when the slurry between the filter screens increases suddenly, the pressure of the cylinder cavity of the adjusting cylinder 1 increases suddenly, then the overflow port of the overflow pressure reducing valve 4 is opened, hydraulic oil is discharged from the overflow port, the pressure of the rod cavity of the adjusting cylinder 1 decreases, the piston rod of the adjusting cylinder 1 can extend slightly to increase the interval between the filter screens, the slurry is adapted to increase suddenly, and the squeeze roll is prevented from being damaged.
When the second reversing valve 6 is in the second working state, hydraulic oil is depressurized by the hydraulic pump 8 through the overflow depressurization valve 4 and flows into the adjusting cylinder 1, and oil is discharged from an oil return port of the overflow depressurization valve 4 and overflows through the first overflow valve 5 and flows to an oil return port of the hydraulic station 8. The first relief valve 5 back-pressures the relief pressure-reducing valve 4 to increase the starting pressure of the relief pressure-reducing valve 4, thereby increasing the hydraulic system pressure. I.e. in the first operating state with respect to the second reversing valve 6, the pressure of the hydraulic system is greater, i.e. the pressure in the rod-containing chamber of the regulator cylinder 1 is greater. The second reversing valve 6 is in the first working state and the second working state, so that the hydraulic system can have two pressure states, and different working requirements can be met.
As shown in fig. 1, the hydraulic system of the twin-wire press further comprises a second adjusting valve group for adjusting the pressure of the rod cavity of the adjusting oil cylinder 1; the oil inlet of the second regulating valve group is communicated with a rod cavity of the regulating oil cylinder 1, and the oil discharge port is communicated with a rodless cavity of the regulating oil cylinder 1.
Specifically, the second adjusting valve group comprises a second overflow valve 11 and a one-way valve 10, the oil inlet end of the one-way valve 10 is communicated with the rod cavity of the adjusting oil cylinder 1, and the oil drain port is communicated with the oil inlet of the second overflow valve 11. The oil drain port of the second overflow valve 11 is communicated with the rodless cavity of the regulating cylinder 1. The second regulating valve group can enable the rod cavity of the regulating oil cylinder 1 to realize unidirectional overflow to the rodless cavity, and when slurry among filter screens suddenly increases, the second regulating valve group overflows simultaneously with the first regulating valve group to increase the discharge rate of hydraulic oil in the rod cavity of the regulating oil cylinder 1 and rapidly reduce the pressure in the rod cavity of the regulating oil cylinder 1, thereby adapting to the sudden increase of the slurry and preventing the squeeze roller from being damaged.
As shown in fig. 1, the hydraulic system of the twin-wire press further comprises two stop valves 9 and two accumulators 7, wherein the two accumulators 7 are communicated with an oil drain port of the hydraulic station 8 and an oil inlet of the overflow pressure reducing valve 4, and the two stop valves 9 are respectively arranged at the oil inlets of the two accumulators 7 in a one-to-one correspondence manner. The pressure of the rod cavity of the regulating cylinder 1 is kept stable by the accumulator 7.
As shown in fig. 1, the hydraulic system of the twin-wire press further comprises a pressure relief valve 2 for preventing the hydraulic system from being excessively pressurized, and the pressure relief valve 2 is arranged at an oil drain port of the hydraulic station 8.
When the hydraulic oil pressure regulating device is used, in the material extruding process, the first regulating valve group is in a first working position, when the first reversing valve 3 is in a first state, when the slurry suddenly increases, the slurry extrudes two filter screens and the extrusion roller, the extrusion roller generates a reaction force on a piston rod of the regulating oil cylinder 1, so that the pressure in a rod cavity of the regulating oil cylinder 1 increases, the overflow pressure reducing valve 4 generates overflow, meanwhile, hydraulic oil in the rod cavity of the regulating oil cylinder 1 flows into a rodless cavity of the regulating oil cylinder 1 through the one-way valve 10 and the second overflow valve 11, the pressure in the rod cavity of the regulating oil cylinder 1 is quickly reduced, the slurry is adapted to suddenly increase, and the extrusion roller is prevented from being damaged.
Similarly, after the distance between the two filter screens is adjusted, the first regulating valve group is in the second working position, when the first reversing valve 3 is in the first state, when slurry suddenly increases, the slurry extrudes the two filter screens and the extrusion roller, the extrusion roller generates a reaction force to the piston rod of the regulating cylinder 1, so that the pressure in the rod cavity of the regulating cylinder 1 increases, the overflow reducing valve 4 generates overflow, and meanwhile, hydraulic oil in the rod cavity of the regulating cylinder 1 flows into the rodless cavity of the regulating cylinder 1 through the one-way valve 10 and the second overflow valve 11, so that the pressure in the rod cavity of the regulating cylinder 1 is rapidly reduced, the slurry is adapted to suddenly increase, and the extrusion roller is prevented from being damaged.
In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.
In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.
Claims (8)
1. The utility model provides a two net press hydraulic system, includes squeeze roll, its characterized in that still includes:
the at least two adjusting oil cylinders are respectively arranged at two ends of the extrusion roller;
a hydraulic station for supplying oil to the regulating cylinder;
the two oil drain ports of the first reversing valve are respectively communicated with the rod cavities and the rodless cavities of the at least two adjusting oil cylinders, the oil return port is communicated with the oil return port of the hydraulic station, and the first reversing valve is provided with a first state for supplying oil to the rod cavities of the adjusting oil cylinders and a second state for supplying oil to the rodless cavities of the adjusting oil cylinders;
the oil inlet of the first regulating valve group is communicated with an oil drain port of the hydraulic station, the oil drain port is communicated with an oil inlet of the first reversing valve, and the overflow port is communicated with an oil return port of the hydraulic station;
the first regulating valve group is provided with a first working position and a second working position, and the oil supply pressure of the regulating oil cylinder, which is obtained by regulating the first regulating valve group at the second working position, is larger than the oil supply pressure of the regulating oil cylinder, which is obtained by regulating the first regulating valve group at the first working position;
the oil inlet of the second regulating valve group is communicated with the rod cavity of the regulating oil cylinder, and the oil drain port is communicated with the rodless cavity of the regulating oil cylinder;
the at least one energy accumulator is communicated with an oil drain port of the hydraulic station and an oil inlet of the first regulating valve group.
2. The twin-wire press hydraulic system according to claim 1, wherein the first valve block comprises an overflow relief valve, an oil inlet of the overflow relief valve being in communication with an oil drain of the hydraulic station, the oil drain being in communication with the first reversing valve, and an overflow port being in communication with an oil return of the hydraulic station.
3. The twin-wire press hydraulic system as defined in claim 2, wherein the first valve block further comprises a first relief valve having an oil inlet in communication with an oil drain of the relief valve, the oil drain in communication with an oil return of the hydraulic station.
4. A twin-wire press hydraulic system as defined in claim 3, wherein the first regulating valve further comprises a second reversing valve, two oil inlets of the second reversing valve being respectively in communication with an oil drain of the overflow pressure reducing valve and an oil return of the hydraulic station, the oil drain being in communication with the oil return of the hydraulic station, the second reversing valve having a first operating state and a second operating state;
when the second reversing valve is in a first working state, an oil return port of the overflow pressure reducing valve is communicated with an oil return port of a hydraulic station;
when the second reversing valve is in a second working state, an oil return port of the overflow pressure reducing valve is communicated with the first overflow valve.
5. The twin-wire press hydraulic system of claim 1, wherein the second valve block includes a second relief valve having an oil inlet in communication with a rod cavity of the adjustment cylinder and an oil outlet in communication with a rodless cavity of the adjustment cylinder.
6. The twin-wire press hydraulic system as defined in claim 5, wherein the second valve block further comprises a one-way valve, an oil inlet end of the one-way valve being in communication with a rod cavity of the adjustment cylinder, and an oil drain opening being in communication with an oil inlet of the second overflow valve.
7. The twin-wire press hydraulic system as defined in claim 1, further comprising at least one shut-off valve, each of said at least one shut-off valves being mounted in one-to-one correspondence with an oil inlet of said at least one accumulator.
8. The twin-wire press hydraulic system according to claim 7, further comprising a relief valve for preventing an excessive pressure of the hydraulic system, said relief valve being mounted to an oil drain of the hydraulic station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322023660.9U CN220396134U (en) | 2023-07-31 | 2023-07-31 | Hydraulic system of double-net pulp squeezer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322023660.9U CN220396134U (en) | 2023-07-31 | 2023-07-31 | Hydraulic system of double-net pulp squeezer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220396134U true CN220396134U (en) | 2024-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322023660.9U Active CN220396134U (en) | 2023-07-31 | 2023-07-31 | Hydraulic system of double-net pulp squeezer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220396134U (en) |
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2023
- 2023-07-31 CN CN202322023660.9U patent/CN220396134U/en active Active
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