Hydraulic system of roller pressing device and roller pressing device

Abstract

The present invention belongs to the technical field of roller pressing devices, and in particular to a hydraulic system of a roller pressing device and a roller pressing device. When working, the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder are pressurized respectively by the first energy storage mechanism, the second energy storage mechanism and the third energy storage mechanism, so as to avoid the energy consumption problem caused by the first oil pressure mechanism, the second oil pressure mechanism and the third oil pressure mechanism working all the time, and achieve energy saving effect; the first hydraulic cylinder and the second hydraulic cylinder are connected to the first oil pressure mechanism and the second oil pressure mechanism respectively, the second hydraulic cylinder is connected to the first oil pressure mechanism, and a fifth stop valve is arranged between the second hydraulic cylinder and the first oil pressure mechanism, and the first hydraulic cylinder and the second hydraulic cylinder are pressurized at the same time by the first oil pressure mechanism to achieve pressure balance; the fifth stop valve is closed, and the first hydraulic cylinder and the second hydraulic cylinder are pressurized by the first oil pressure mechanism and the second oil pressure mechanism respectively, so as to achieve bias pressure, and achieve the balance of the upper pressure roller and the adjustable bias pressure.

Description

Technical Field

[0001] The invention belongs to the technical field of roller pressing devices, and in particular relates to a hydraulic system of a roller pressing device and a roller pressing device. Background Art

[0002] When the roller pressing device is working, the extension and contraction of the piston cylinder is controlled by the hydraulic system, thereby controlling the upper pressing roller to fall and rise, so that the upper pressing roller contacts or separates with the lower pressing roller.

[0003] In the prior art, when the roller pressing device is working, the upper and lower rollers are in a pressure-maintaining state, and the oil pump continuously supplies oil. The oil pump stops working only when the equipment is debugged or a fault is repaired. The working pressure must remain unchanged during operation. To maintain the working pressure unchanged, the oil pump still needs to continuously output pressure and is in a working state for a long time, resulting in high energy consumption.

[0004] At the same time, in actual work, there are situations such as uneven wear of the pressing rollers or uneven thickness of the pressed materials. At this time, it is necessary to adjust the control pressure of the oil cylinders at both ends respectively to make the pressures generated at both ends unequal in order to achieve the bias pressure requirements required in the production process. For this purpose, a hydraulic system and a rolling device are proposed. Summary of the invention

[0005] The object of the present invention is to provide a hydraulic system of a roller pressing device and a roller pressing device to solve the above-mentioned problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A hydraulic system of a rolling device, comprising: an upper roller hydraulic circuit and a lower roller hydraulic circuit, the upper roller hydraulic circuit comprising a first oil pressure mechanism and a second oil pressure mechanism connected to an oil tank, the first oil pressure mechanism being connected to a first three-position four-way electromagnetic reversing valve, a first energy storage mechanism, a second three-position four-way electromagnetic reversing valve and a second energy storage mechanism, a fifth stop valve being arranged between the first oil pressure mechanism and the second three-position four-way electromagnetic reversing valve and the second energy storage mechanism, the second three-position four-way electromagnetic reversing valve being connected to the second oil pressure mechanism, the first three-position four-way electromagnetic reversing valve being connected to a first hydraulic cylinder and the oil tank, a first pressure monitoring mechanism being arranged between the first three-position four-way electromagnetic reversing valve and the first hydraulic cylinder, the second three-position four-way electromagnetic reversing valve being connected to the second hydraulic cylinder and the oil tank, and a second pressure monitoring mechanism being arranged between the second three-position four-way electromagnetic reversing valve and the second hydraulic cylinder;

[0008] The lower pressure roller hydraulic circuit includes a third oil pressure mechanism, the third oil pressure mechanism is connected to the oil tank, the third oil pressure mechanism is connected to a third hydraulic cylinder and a fourth hydraulic cylinder, and a third energy storage mechanism and a third pressure monitoring mechanism are arranged between the third oil pressure mechanism and the third hydraulic cylinder and the fourth hydraulic cylinder.

[0009] In a hydraulic system of a rolling device of the present invention, the third oil pressure mechanism is connected to a third electromagnetic overflow valve, the third oil pressure mechanism is connected to an oil inlet of a fifth one-way valve, the oil outlet of the fifth one-way valve is respectively connected to a third rodless chamber of the third hydraulic cylinder and a fourth rodless chamber of the fourth hydraulic cylinder, a first one-way throttle valve is arranged between the fifth one-way valve and the third rodless chamber, a third one-way throttle valve is arranged between the fifth one-way valve and the fourth rodless chamber, the third rod chamber of the third hydraulic cylinder is connected to the oil tank, and the fourth rod chamber of the fourth hydraulic cylinder is connected to the oil tank.

[0010] In a hydraulic system of a rolling device of the present invention, the third oil pressure mechanism is connected to the oil inlet of the sixth one-way valve, the oil outlet of the sixth one-way valve is connected to the P port of the two-position three-way solenoid reversing valve, the A port of the two-position three-way solenoid reversing valve is connected to the control oil port of the hydraulically controlled one-way valve, the oil outlet of the hydraulically controlled one-way valve is connected to the oil tank, the oil inlet of the hydraulically controlled one-way valve is connected to the first throttle valve, and the first throttle valve is connected to the first one-way throttle valve and the third one-way throttle valve.

[0011] In a hydraulic system of a rolling device of the present invention, the first oil pressure mechanism is connected to the inlet end of the first one-way valve, the outlet end of the first one-way valve is connected to the P port of the first three-position four-way solenoid reversing valve, the A port of the first three-position four-way solenoid reversing valve is connected to the first pressure monitoring mechanism, the first pressure monitoring mechanism is connected to the first rodless chamber of the first hydraulic cylinder, the first rod chamber of the first hydraulic cylinder is connected to the B port of the first three-position four-way solenoid reversing valve through the third stop valve, the T port of the first three-position four-way solenoid reversing valve is connected to the inlet end of the fourth one-way valve, the outlet end of the fourth one-way valve is connected to the oil tank, and a first electromagnetic overflow valve is connected in parallel between the inlet end of the first one-way valve and the outlet end of the fourth one-way valve.

[0012] In a hydraulic system of a rolling device of the present invention, the second oil pressure mechanism is connected to the inlet end of the third one-way valve, the outlet end of the third one-way valve is connected to the P port of the second three-position four-way solenoid reversing valve, the A port of the second three-position four-way solenoid reversing valve is connected to the second pressure monitoring mechanism, the second pressure monitoring mechanism is connected to the second rodless chamber of the second hydraulic cylinder, the second rod chamber of the second hydraulic cylinder is connected to the B port of the second three-position four-way solenoid reversing valve through the seventh stop valve, the T port of the second three-position four-way solenoid reversing valve is connected to the inlet end of the second one-way valve, the outlet end of the second one-way valve is connected to the oil tank, and a second electromagnetic overflow valve is connected in parallel between the outlet end of the second one-way valve and the inlet end of the third one-way valve.

[0013] In a hydraulic system of a rolling device of the present invention, both the first rod chamber and the second rod chamber are connected to a manual pump, and the manual pump is connected to the oil tank.

[0014] In a hydraulic system of a rolling device of the present invention, the outlet end of the first one-way valve is connected to a first stop valve, and the first stop valve is connected to a first pressure gauge;

[0015] The outlet end of the third one-way valve is connected to a ninth stop valve, and the ninth stop valve is connected to a second pressure gauge.

[0016] In a hydraulic system of a rolling device of the present invention, a fourth stop valve is connected in parallel between the outlet end of the first one-way valve and the oil tank, a sixth stop valve is connected in parallel between the outlet end of the third one-way valve and the oil tank, and the fourth stop valve is connected to the sixth stop valve.

[0017] In a hydraulic system of a rolling device of the present invention, the inlet end of the first throttle valve is connected to the A port of the two-position three-way manual reversing valve, and the T port of the two-position three-way manual reversing valve is connected to the oil tank.

[0018] A rolling device comprises a hydraulic system of the rolling device.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] When the present invention is working, the fifth stop valve is opened, and the first oil pressure mechanism charges the first hydraulic cylinder and the second hydraulic cylinder, and the first energy storage mechanism and the second energy storage mechanism at the same time, and at this time, the pressure between the first hydraulic cylinder and the second hydraulic cylinder is equal;

[0021] When bias pressure is required, the fifth stop valve is closed, the first oil pressure mechanism pressurizes the first hydraulic cylinder, and the second oil pressure mechanism pressurizes the second hydraulic cylinder, and the bias pressure is achieved by adjusting the first oil pressure mechanism and the second oil pressure mechanism;

[0022] The first oil pressure mechanism pressurizes the first hydraulic cylinder and the second hydraulic cylinder and charges the first energy storage mechanism and the second energy storage mechanism at the same time. When the upper pressure roller needs to be pressurized or maintained, the first oil pressure mechanism stops working and the first hydraulic cylinder and the second hydraulic cylinder are depressurized. At this time, the first energy storage mechanism and the second energy storage mechanism pressurize the first hydraulic cylinder and the second hydraulic cylinder respectively. When the first pressure monitoring mechanism detects that the pressure of the first hydraulic cylinder is reduced to a set value and the second pressure monitoring mechanism detects that the pressure of the second hydraulic cylinder is reduced to a set value, the first oil pressure mechanism starts working, pressurizes the first hydraulic cylinder and the second hydraulic cylinder, the first energy storage mechanism and the second energy storage mechanism, and charges the first energy storage mechanism and the second energy storage mechanism, thereby avoiding the problem of continuous operation of the first oil pressure mechanism / the second oil pressure mechanism and high energy consumption, thereby achieving energy saving effect.

[0023] The third oil pressure mechanism pressurizes the third hydraulic cylinder and charges the third energy storage mechanism at the same time. When the lower pressure roller rises, pressurizes and maintains pressure, the third oil pressure mechanism stops working, the third hydraulic cylinder relieves pressure, and the third energy storage mechanism pressurizes the third hydraulic cylinder. The third pressure monitoring mechanism detects that the pressure of the third hydraulic cylinder decreases to the set value. The third oil pressure mechanism works to pressurize the third hydraulic cylinder and charges the third energy storage mechanism at the same time.

[0024] The hydraulic system of the present invention is provided with a first energy storage mechanism, a second energy storage mechanism and a third energy storage mechanism. The first energy storage mechanism, the second energy storage mechanism and the third energy storage mechanism are used to pressurize the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder respectively, so as to avoid the energy consumption problem caused by the first oil pressure mechanism, the second oil pressure mechanism and the third oil pressure mechanism working all the time, and achieve energy saving effect; the first hydraulic cylinder and the second hydraulic cylinder are connected to the first oil pressure mechanism and the second oil pressure mechanism respectively, the second hydraulic cylinder is connected to the first oil pressure mechanism, and a fifth stop valve is provided between the second hydraulic cylinder and the first oil pressure mechanism. The first hydraulic cylinder and the second hydraulic cylinder are pressurized at the same time by the first oil pressure mechanism to achieve pressure balance; the fifth stop valve is closed, and the first hydraulic cylinder and the second hydraulic cylinder are pressurized by the first oil pressure mechanism and the second oil pressure mechanism respectively, so as to achieve bias pressure, and realize the balance of the upper pressure roller and the adjustable bias pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0026] Figure 1 It is a structural schematic diagram of the hydraulic circuit of the upper pressure roller in the present invention;

[0027] Figure 2It is a structural schematic diagram of the hydraulic circuit of the lower pressure roller in the present invention;

[0028] Among them, 1. oil tank; 2. first oil pump; 3. first electromagnetic overflow valve; 4. first non-return valve; 5. first stop valve; 6. first pressure gauge; 7. first three-position four-way electromagnetic reversing valve; 8. second stop valve; 9. first accumulator; 10. first pressure measuring joint; 11. first pressure sensor; 12. first rodless cavity; 13. first rod cavity; 14. third stop valve; 15. fourth stop valve; 16. fifth stop valve; 17. sixth stop valve; 18. second pressure measuring joint; 19. second pressure sensor; 20. second rodless cavity; 21. second rod cavity; 22. seventh stop valve; 23. second accumulator; 24. second three-position four-way electromagnetic reversing valve; 25. eighth stop valve; 26. second pressure gauge; 27. The ninth stop valve; 28, the second one-way valve; 29, the second electromagnetic overflow valve; 30, the second oil pump; 31, the third one-way valve; 32, the manual pump; 33, the fourth one-way valve; 34, the two-position three-way manual reversing valve; 35, the first one-way throttle valve; 36, the third rodless chamber; 37, the third rod chamber; 38, the third pressure sensor; 39, the two-position three-way solenoid reversing valve; 40, the third pressure measuring joint; 41, the fifth one-way valve; 42, the third pressure gauge; 43, the third oil pump; 44, the sixth one-way valve; 45, the third electromagnetic overflow valve; 46, the third accumulator; 47, the second one-way throttle valve; 48, the third one-way throttle valve; 49, the fourth rod chamber; 50, the fourth rodless chamber; 51, the first throttle valve; 52, the hydraulically controlled one-way valve. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1 to Figure 2The present invention discloses a hydraulic system of a rolling device, comprising: an upper roller hydraulic circuit and a lower roller hydraulic circuit, the upper roller hydraulic circuit comprising a first oil pressure mechanism and a second oil pressure mechanism connected to an oil tank 1, the first oil pressure mechanism is connected to a first three-position four-way electromagnetic reversing valve 7, a first energy storage mechanism, a second three-position four-way electromagnetic reversing valve 24 and a second energy storage mechanism, a fifth stop valve 16 is arranged between the first oil pressure mechanism and the second three-position four-way electromagnetic reversing valve 24 and the second energy storage mechanism, the second three-position four-way electromagnetic reversing valve 24 is connected to the second oil pressure mechanism, the first three-position four-way electromagnetic reversing valve 7 is connected to the first hydraulic cylinder and the oil tank 1, a first pressure monitoring mechanism is arranged between the first three-position four-way electromagnetic reversing valve 7 and the first hydraulic cylinder, the second three-position four-way electromagnetic reversing valve 24 is connected to the second hydraulic cylinder and the oil tank 1, and a second pressure monitoring mechanism is arranged between the second three-position four-way electromagnetic reversing valve 24 and the second hydraulic cylinder;

[0032] The lower pressure roller hydraulic circuit includes a third oil pressure mechanism, which is connected to the oil tank 1, connected to the third hydraulic cylinder and the fourth hydraulic cylinder, and a third energy storage mechanism and a third pressure monitoring mechanism are arranged between the third oil pressure mechanism and the third hydraulic cylinder and the fourth hydraulic cylinder.

[0033] When working, the fifth stop valve 16 is opened, and the first oil pressure mechanism charges the first hydraulic cylinder and the second hydraulic cylinder, and the first energy storage mechanism and the second energy storage mechanism at the same time, and the pressure between the first hydraulic cylinder and the second hydraulic cylinder is equal;

[0034] When bias pressure is required, the fifth stop valve 16 is closed, the first hydraulic mechanism pressurizes the first hydraulic cylinder, and the second hydraulic mechanism pressurizes the second hydraulic cylinder. By adjusting the first hydraulic mechanism and the second hydraulic mechanism, bias pressure is achieved;

[0035] The first oil pressure mechanism pressurizes the first hydraulic cylinder and the second hydraulic cylinder and charges the first energy storage mechanism and the second energy storage mechanism at the same time. When the upper pressure roller needs to be pressurized or maintained, the first oil pressure mechanism stops working and the first hydraulic cylinder and the second hydraulic cylinder are depressurized. At this time, the first energy storage mechanism and the second energy storage mechanism pressurize the first hydraulic cylinder and the second hydraulic cylinder respectively. When the first pressure monitoring mechanism detects that the pressure of the first hydraulic cylinder is reduced to a set value and the second pressure monitoring mechanism detects that the pressure of the second hydraulic cylinder is reduced to a set value, the first oil pressure mechanism starts working, pressurizes the first hydraulic cylinder and the second hydraulic cylinder, the first energy storage mechanism and the second energy storage mechanism, and charges the first energy storage mechanism and the second energy storage mechanism, thereby avoiding the problem of continuous operation of the first oil pressure mechanism / the second oil pressure mechanism and high energy consumption, thereby achieving energy saving effect.

[0036] The third oil pressure mechanism pressurizes the third hydraulic cylinder and charges the third energy storage mechanism at the same time. When the lower pressure roller rises, pressurizes and maintains pressure, the third oil pressure mechanism stops working, the third hydraulic cylinder relieves pressure, and the third energy storage mechanism pressurizes the third hydraulic cylinder. The third pressure monitoring mechanism detects that the pressure of the third hydraulic cylinder decreases to the set value. The third oil pressure mechanism works to pressurize the third hydraulic cylinder and charges the third energy storage mechanism at the same time.

[0037] In a feasible scheme, the third oil pressure mechanism is connected to the third electromagnetic overflow valve 45, the third oil pressure mechanism is connected to the oil inlet of the fifth one-way valve 41, the oil outlet of the fifth one-way valve 41 is respectively connected to the third rodless chamber 36 of the third hydraulic cylinder and the fourth rodless chamber 50 of the fourth hydraulic cylinder, a first one-way throttle valve 35 is arranged between the fifth one-way valve 41 and the third rodless chamber 36, a third one-way throttle valve 48 is arranged between the fifth one-way valve 41 and the fourth rodless chamber 50, the third rod chamber 37 of the third hydraulic cylinder is connected to the oil tank 1, and the fourth rod chamber 49 of the fourth hydraulic cylinder is connected to the oil tank 1.

[0038] In a feasible solution, the third oil pressure mechanism is connected to the oil inlet of the sixth one-way valve 44, the oil outlet of the sixth one-way valve 44 is connected to the P port of the two-position three-way solenoid reversing valve 39, the A port of the two-position three-way solenoid reversing valve 39 is connected to the control oil port of the hydraulically controlled one-way valve 52, the oil outlet of the hydraulically controlled one-way valve 52 is connected to the oil tank 1, the oil inlet of the hydraulically controlled one-way valve 52 is connected to the first throttle valve 51, and the first throttle valve 51 is connected to the first one-way throttle valve 35 and the third one-way throttle valve 48.

[0039] When work stops and quick separation is required: the electromagnet ZC1 of the two-position three-way solenoid reversing valve 39 is energized, the two-position three-way solenoid reversing valve 39 is in the left position, and the P port is connected to the A port; the third oil pump 43 pumps out the hydraulic oil to the control oil port of the hydraulically controlled one-way valve 52, and the hydraulically controlled one-way valve 52 is opened. The hydraulic oil in the third rodless chamber 36 and the fourth rodless chamber 50 flows into the oil inlet of the hydraulically controlled one-way valve 52 through the reverse-conducting first one-way throttle valve 35 and the third one-way throttle valve 48, and returns to the oil tank 1 through the oil outlet of the hydraulically controlled one-way valve 52.

[0040] In a feasible scheme, the first oil pressure mechanism is connected to the inlet end of the first one-way valve 4, the outlet end of the first one-way valve 4 is connected to the P port of the first three-position four-way solenoid reversing valve 7, the A port of the first three-position four-way solenoid reversing valve 7 is connected to the first pressure monitoring mechanism, the first pressure monitoring mechanism is connected to the first rodless chamber 12 of the first hydraulic cylinder, the first rod chamber 13 of the first hydraulic cylinder is connected to the B port of the first three-position four-way solenoid reversing valve 7 through the third stop valve 14, the T port of the first three-position four-way solenoid reversing valve 7 is connected to the inlet end of the fourth one-way valve 33, the outlet end of the fourth one-way valve 33 is connected to the oil tank 1, and a first electromagnetic overflow valve 3 is connected in parallel between the inlet end of the first one-way valve 4 and the outlet end of the fourth one-way valve 33.

[0041] The first check valve 4 prevents the hydraulic oil from flowing back.

[0042] In a feasible scheme, the second oil pressure mechanism is connected to the inlet end of the third one-way valve 31, the outlet end of the third one-way valve 31 is connected to the P port of the second three-position four-way solenoid reversing valve 24, the A port of the second three-position four-way solenoid reversing valve 24 is connected to the second pressure monitoring mechanism, the second pressure monitoring mechanism is connected to the second rodless chamber 20 of the second hydraulic cylinder, the second rod chamber 21 of the second hydraulic cylinder is connected to the B port of the second three-position four-way solenoid reversing valve 24 through the seventh stop valve 22, the T port of the second three-position four-way solenoid reversing valve 24 is connected to the inlet end of the second one-way valve 28, the outlet end of the second one-way valve 28 is connected to the oil tank 1, and a second electromagnetic overflow valve 29 is connected in parallel between the outlet end of the second one-way valve 28 and the inlet end of the third one-way valve 31.

[0043] The third one-way valve 31 prevents the hydraulic oil from flowing back.

[0044] In a feasible solution, the first rod chamber 13 and the second rod chamber 21 are both connected to the manual pump 32 , and the manual pump 32 is connected to the oil tank 1 .

[0045] When power failure occurs: the first three-position four-way solenoid reversing valve 7 is in the middle position, port A is connected to port T, and port B is connected to port T; the second three-position four-way solenoid reversing valve 24 is in the middle position, port A is connected to port T, and port B is connected to port T; the third stop valve 14 and the seventh stop valve 22 are closed, and the hydraulic oil in the first rodless chamber 12 and the second rodless chamber 20 is pressed out by the manual pump 32, and flows into port A of the first three-position four-way solenoid reversing valve 7 and port A of the second three-position four-way solenoid reversing valve 24, and then flows out from port T of the first three-position four-way solenoid reversing valve 7 and port T of the second three-position four-way solenoid reversing valve 24, and returns to the oil tank 1 through the fourth one-way valve 33 and the second one-way valve 28 respectively.

[0046] In a feasible solution, the outlet end of the first one-way valve 4 is connected to a first stop valve 5, and the first stop valve 5 is connected to a first pressure gauge 6;

[0047] The outlet end of the third one-way valve 31 is connected to the ninth stop valve 27 , and the ninth stop valve 27 is connected to the second pressure gauge 26 .

[0048] In a feasible solution, a fourth stop valve 15 is connected in parallel between the outlet end of the first one-way valve 4 and the oil tank 1 , a sixth stop valve 17 is connected in parallel between the outlet end of the third one-way valve 31 and the oil tank 1 , and the fourth stop valve 15 is connected to the sixth stop valve 17 .

[0049] In a feasible solution, the inlet end of the first throttle valve 51 is connected to the A port of the two-position three-way manual reversing valve 34 , and the T port of the two-position three-way manual reversing valve 34 is connected to the oil tank 1 .

[0050] A rolling device comprises a hydraulic system of the rolling device.

[0051] One specific example:

[0052] The first hydraulic mechanism includes a first oil pump 2, the second hydraulic mechanism includes a second oil pump 30, and the third hydraulic mechanism includes a third oil pump 43;

[0053] The first energy storage mechanism includes a first accumulator 9, which is connected to the outlet end of the first one-way valve 4 through a second stop valve 8. The second energy storage mechanism includes a second accumulator 23, which is connected to the outlet ends of the first one-way valve 4 and the third one-way valve 31 through an eighth stop valve 25. The third energy storage mechanism includes a third accumulator 46, which is connected to the outlet end of the fifth one-way valve 41 through a second one-way throttle valve 47.

[0054] The first pressure monitoring mechanism includes a first pressure measuring joint 10 and a first pressure sensor 11 connected between the A port of the first three-position four-way electromagnetic reversing valve 7 and the first rodless chamber 12, the second pressure monitoring mechanism includes a second pressure measuring joint 18 and a second pressure sensor 19 connected between the A port of the second three-position four-way electromagnetic reversing valve 24 and the second rodless chamber 20, and the third pressure monitoring mechanism includes a third pressure sensor 38 connected to the outlet end of the fifth one-way valve 41;

[0055] A third pressure measuring joint 40 is provided between the outlet end of the sixth one-way valve 44 and the P port of the two-position three-way electromagnetic reversing valve 39;

[0056] A third pressure gauge 42 is provided at the outlet end of the third oil pump 43 .

[0057] The oil pressure port of the first oil pump 2 is connected to the oil inlet of the first electromagnetic overflow valve 3, the oil outlet of the first electromagnetic overflow valve 3 is connected to the oil tank 1, the oil pressure port of the second oil pump 30 is connected to the oil inlet of the second electromagnetic overflow valve 29, and the oil outlet of the second electromagnetic overflow valve 29 is connected to the oil tank 1.

[0058] The oil pressure port of the first oil pump 2 is connected to the oil inlet of the first one-way valve 4 , and the oil pressure port of the second oil pump 30 is connected to the oil inlet of the third one-way valve 31 .

[0059] The oil outlet of the first check valve 4 is connected to the P port of the first three-position four-way solenoid reversing valve 7 and the P port of the second three-position four-way solenoid reversing valve 24, the oil outlet of the third check valve 31 is connected to the P port of the first three-position four-way solenoid reversing valve 7 and the P port of the second three-position four-way solenoid reversing valve 24, the oil inlet of the fourth check valve 33 is connected to the T port of the first three-position four-way solenoid reversing valve 7, the oil inlet of the second check valve 28 is connected to the T port of the second three-position four-way solenoid reversing valve 24, and the oil outlets of the fourth check valve 33 and the second check valve 28 are connected to the oil tank 1.

[0060] Port A of the first three-position four-way solenoid reversing valve 7 is connected to the first rodless chamber 12, port B of the first three-position four-way solenoid reversing valve 7 is connected to the first rod chamber 13, port A of the second three-position four-way solenoid reversing valve 24 is connected to the second rodless chamber 20, and port B of the second three-position four-way solenoid reversing valve 24 is connected to the second rod chamber 21.

[0061] The first pressure gauge 6 is connected to the oil outlet of the first one-way valve 4 through the first stop valve 5, the first accumulator 9 is connected to the oil outlet of the first one-way valve 4 through the second stop valve 8, the second pressure gauge 26 is connected to the oil outlet of the third one-way valve 31 through the ninth stop valve 27, and the second accumulator 23 is connected to the oil outlet of the third one-way valve 31 through the eighth stop valve 25.

[0062] The first pressure measuring joint 10 and the first pressure sensor 11 are connected to the first rodless cavity 12 , and the second pressure measuring joint 18 and the second pressure sensor 19 are connected to the second rodless cavity 20 .

[0063] The oil outlet of the manual pump 32 is connected to the first rod chamber 13 and the second rod chamber 21 , and the oil inlet of the manual pump 32 is connected to the oil tank 1 .

[0064] The third stop valve 14 is connected between the B port of the first three-position four-way solenoid reversing valve 7 and the first rod chamber 13, the seventh stop valve 22 is connected between the B port of the second three-position four-way solenoid reversing valve 24 and the second rod chamber 21, the fifth stop valve 16 is connected between the P port of the first three-position four-way solenoid reversing valve 7 and the P port of the second three-position four-way solenoid reversing valve 24, the fourth stop valve 15 is connected between the oil outlet of the first check valve 4 and the oil tank 1, and the sixth stop valve 17 is connected between the oil outlet of the third check valve 31 and the oil tank 1.

[0065] The oil pressure port of the third oil pump 43 is connected to the oil inlet of the third electromagnetic relief valve 45 , and the oil outlet of the third electromagnetic relief valve 45 is connected to the oil tank 1 .

[0066] The oil pressure port of the third oil pump 43 is connected to the oil inlet of the fifth one-way valve 41 , and the oil pressure port of the third oil pump 43 is connected to the oil inlet of the sixth one-way valve 44 .

[0067] The oil outlet of the sixth one-way valve 44 is connected to the P port of the two-position three-way electromagnetic reversing valve 39 .

[0068] The oil outlet of the fifth check valve 41 is connected to the third rodless chamber 36 and the fourth rodless chamber 50 , and the third rod chamber 37 and the fourth rod chamber 49 are connected to the oil tank 1 .

[0069] The first one-way throttle valve 35 is connected to the third rodless chamber 36, and the third one-way throttle valve 48 is connected to the fourth rodless chamber 50, and they are connected by the oil inlet throttling method.

[0070] The third accumulator 46 and the second one-way throttle valve 47 form an accumulator group, wherein the second one-way throttle valve 47 is connected by a return oil throttling method, and the accumulator group is connected to the oil inlet of the first throttle valve 51.

[0071] The third pressure sensor 38 is connected to the oil inlet of the first throttle valve 51 .

[0072] The third pressure measuring joint 40 is connected to the oil outlet of the sixth one-way valve 44 , and the third pressure gauge 42 is connected to the oil inlet of the fifth one-way valve 41 .

[0073] The A port of the two-position three-way solenoid reversing valve 39 is connected to the control oil port of the hydraulically controlled one-way valve 52, the oil outlet of the hydraulically controlled one-way valve 52 is connected to the oil tank 1, the oil inlet of the hydraulically controlled one-way valve 52 is connected to the first throttle valve 51, and the oil inlet of the first throttle valve 51 is connected between the first one-way throttle valve 35 and the third one-way throttle valve 48.

[0074] The A port of the two-position three-way manual reversing valve 34 is connected to the oil inlet of the first throttle valve 51 , and the T port of the two-position three-way manual reversing valve 34 is connected to the oil tank 1 .

[0075] Combination Figure 1 Further explanation of the upper pressure roller hydraulic circuit:

[0076] When the rolling device does not start to work, the first rodless chamber 12 and the second rodless chamber 20 are free of hydraulic oil, and the first hydraulic cylinder and the second hydraulic cylinder remain in a contracted state.

[0077] When the rolling device starts working, the upper roller needs to reach the specified position and contact the lower roller. To complete this action, the upper roller hydraulic circuit performs the following operations: if the specified oil pressure is not reached in the oil circuit, the first pressure sensor 11 and the second pressure sensor 19 send signals, and the first electromagnetic overflow valve 3 and the second electromagnetic overflow valve 29 are energized; the fourth stop valve 15 and the sixth stop valve 17 remain closed, and the remaining stop valves remain open; the electromagnet EC1 of the first three-position four-way electromagnetic reversing valve 7 is energized, the first three-position four-way electromagnetic reversing valve 7 is in the left position, the P port is connected to the A port, and the B port is connected to the T port; the electromagnet EC3 of the second three-position four-way electromagnetic reversing valve 24 is energized, the second three-position four-way electromagnetic reversing valve 24 is in the left position, the P port is connected to the A port, and the B port is connected to the T port; the first oil pump 2 works, and the output hydraulic oil flows into the first three-position four-way electromagnetic reversing valve 24 through the first one-way valve 4. The hydraulic oil flows into the P port of the magnetic reversing valve 7 and the second three-position four-way solenoid reversing valve 24, and flows out from the A port of the first three-position four-way solenoid reversing valve 7 and the second three-position four-way solenoid reversing valve 24 respectively, enters the first rodless chamber 12 and the second rodless chamber 20 respectively, pushes out the piston rod, and charges the first accumulator 9 and the second accumulator 23 at the same time. The hydraulic oil in the first rod chamber 13 and the second rod chamber 21 flows out, passes through the opened third stop valve 14 and the opened seventh stop valve 22 respectively, and flows into the B port of the first three-position four-way solenoid reversing valve 7 and the B port of the second three-position four-way solenoid reversing valve 24 respectively, and then flows into the fourth one-way valve 33 and the second one-way valve 28 from the T port of the first three-position four-way solenoid reversing valve 7 and the T port of the second three-position four-way solenoid reversing valve 24 respectively, and returns to the oil tank 1.

[0078] When the upper pressure roller descends and pressurizes: when the oil pressure in the oil circuit rises to a certain value, the first pressure sensor 11 and the second pressure sensor 19 send a signal to cut off the power to the first electromagnetic overflow valve 3, relieve the pressure in the oil circuit, and the first one-way valve 4 prevents the hydraulic oil from flowing back to ensure that the hydraulic cylinder will not relieve the pressure; when the pressure in the first rodless chamber 12 or the second rodless chamber 20 drops, the first accumulator 9 and the second accumulator 23 compensate for the leakage of the oil circuit to stabilize its pressure; when the oil circuit pressure is lower than a certain value, the first pressure sensor 11 and the second pressure sensor 19 send a signal to turn on the first electromagnetic overflow valve 3, and the first oil pump 2 pressurizes the first rodless chamber 12 and the second rodless chamber 20, and at the same time the first oil pump 2 charges the first accumulator 9 and the second accumulator 23.

[0079] When the upper pressure roller returns: the electromagnet EC2 of the first three-position four-way electromagnetic reversing valve 7 is energized, the first three-position four-way electromagnetic reversing valve 7 is in the right position, the A port is connected to the T port, and the B port is connected to the P port; the electromagnet EC4 of the second three-position four-way electromagnetic reversing valve 24 is energized, the second three-position four-way electromagnetic reversing valve 24 is in the right position, the A port is connected to the T port, and the B port is connected to the P port; the first oil pump 2 works, and the output hydraulic oil flows through the first check valve 4 into the first three-position four-way electromagnetic reversing valve 7 and the P port of the second three-position four-way electromagnetic reversing valve 24, and respectively from The hydraulic oil flows out from the B port of the first three-position four-way solenoid reversing valve 7 and the second three-position four-way solenoid reversing valve 24, respectively enters the first rod chamber 13 and the second rod chamber 21, and retracts the piston rod; the hydraulic oil flows out from the first rodless chamber 12 and the second rodless chamber 20, respectively flows into the A port of the first three-position four-way solenoid reversing valve 7 and the A port of the second three-position four-way solenoid reversing valve 24, and then flows into the fourth one-way valve 33 and the second one-way valve 28 from the T port of the first three-position four-way solenoid reversing valve 7 and the T port of the second three-position four-way solenoid reversing valve 24, and returns to the oil tank 1.

[0080] When bias pressure is required, the fifth stop valve 16 is closed to convert the entire hydraulic circuit into two identical hydraulic circuits that do not interfere with each other. At this time, the unloading pressure of the first electromagnetic overflow valve 3 and the second electromagnetic overflow valve 29 can be adjusted to control the pressure in the two hydraulic circuits respectively.

[0081] When power failure occurs: the first three-position four-way solenoid reversing valve 7 is in the middle position, port A is connected to port T, and port B is connected to port T; the second three-position four-way solenoid reversing valve 24 is in the middle position, port A is connected to port T, and port B is connected to port T; the third stop valve 14 and the seventh stop valve 22 are closed, and the hydraulic oil in the first rodless chamber 12 and the second rodless chamber 20 is pressed out by the manual pump 32, and flows into port A of the first three-position four-way solenoid reversing valve 7 and port A of the second three-position four-way solenoid reversing valve 24, and then flows out from port T of the first three-position four-way solenoid reversing valve 7 and port T of the second three-position four-way solenoid reversing valve 24, and returns to the oil tank 1 through the fourth one-way valve 33 and the second one-way valve 28 respectively.

[0082] Combination Figure 2 Further explanation of the hydraulic circuit of the lower pressure roller:

[0083] When the rolling device does not start to work, the third rodless chamber 36 and the fourth rodless chamber 50 have no hydraulic oil, and the hydraulic cylinder remains in a contracted state.

[0084] When the rolling device starts working, the lower roller needs to reach the specified position and contact the upper roller. To complete this action, the hydraulic circuit of the lower roller performs the following operations: the two-position three-way manual reversing valve 34 is in the right position, and the A port is not connected to the T port; the two-position three-way electromagnetic reversing valve 39 is in the right position, and the P port is not connected to the A port; the oil circuit does not reach the specified oil pressure, the third pressure sensor 38 sends a signal, the third electromagnetic overflow valve 45 is energized, the third oil pump 43 supplies oil to the oil circuit, and through the fifth one-way valve 41, the third rodless chamber 36 and the fourth rodless chamber 50 are supplied with oil, the piston rod extends, and the third accumulator 46 is charged at the same time.

[0085] When the lower pressure roller rises and pressurizes: when the oil pressure in the oil circuit reaches a certain value, the third pressure sensor 38 sends a signal, the third electromagnetic overflow valve 45 is powered off, the oil circuit is depressurized, and the fifth one-way valve 41 prevents the hydraulic oil from flowing back, ensuring that the hydraulic cylinder will not be depressurized. When the pressure in the third rodless chamber 36 and the fourth rodless chamber 50 drops, the third accumulator 46 compensates for the leakage to stabilize the pressure; when the oil circuit pressure is lower than a certain value, the third pressure sensor 38 sends a signal to power on the third electromagnetic overflow valve 45, and the third oil pump 43 pressurizes the third rodless chamber 36 and the fourth rodless chamber 50, and at the same time the third oil pump 43 charges the third accumulator 46.

[0086] When work stops and the upper and lower pressure rollers need to be separated quickly: the electromagnet ZC1 of the two-position three-way solenoid reversing valve 39 is energized, the two-position three-way solenoid reversing valve 39 is in the left position, and the P port is connected to the A port; the third oil pump 43 pumps out the hydraulic oil to the control oil port of the hydraulically controlled one-way valve 52, opens the hydraulically controlled one-way valve 52, and the hydraulic oil in the third rodless chamber 36 and the fourth rodless chamber 50 flows into the oil inlet of the hydraulically controlled one-way valve 52 through the reverse-conducting first one-way throttle valve 35 and the third one-way throttle valve 48, and returns to the oil tank 1 through the oil outlet of the hydraulically controlled one-way valve 52.

[0087] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0088] The above embodiments are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A hydraulic system of a roller pressing device, characterized in that: include: An upper pressure roller hydraulic circuit and a lower pressure roller hydraulic circuit, wherein the upper pressure roller hydraulic circuit comprises a first oil pressure mechanism and a second oil pressure mechanism connected to an oil tank (1), the first oil pressure mechanism being connected to a first three-position four-way electromagnetic reversing valve (7), a first energy storage mechanism, a second three-position four-way electromagnetic reversing valve (24) and a second energy storage mechanism, a fifth stop valve (16) being arranged between the first oil pressure mechanism and the second three-position four-way electromagnetic reversing valve (24) and the second energy storage mechanism, the second three-position four-way electromagnetic reversing valve (24) being connected to the second oil pressure mechanism, the first three-position four-way electromagnetic reversing valve (7) being connected to a first hydraulic cylinder and the oil tank (1), a first pressure monitoring mechanism being arranged between the first three-position four-way electromagnetic reversing valve (7) and the first hydraulic cylinder, the second three-position four-way electromagnetic reversing valve (24) being connected to a second hydraulic cylinder and the oil tank (1), and a second pressure monitoring mechanism being arranged between the second three-position four-way electromagnetic reversing valve (24) and the second hydraulic cylinder; The lower pressure roller hydraulic circuit comprises a third oil pressure mechanism, the third oil pressure mechanism is connected to the oil tank (1), the third oil pressure mechanism is connected to a third hydraulic cylinder and a fourth hydraulic cylinder, and a third energy storage mechanism and a third pressure monitoring mechanism are arranged between the third oil pressure mechanism and the third hydraulic cylinder and the fourth hydraulic cylinder; The third oil pressure mechanism is connected to a third electromagnetic overflow valve (45), the third oil pressure mechanism is connected to an oil inlet of a fifth one-way valve (41), the oil outlet of the fifth one-way valve (41) is respectively connected to a third rodless chamber (36) of the third hydraulic cylinder and a fourth rodless chamber (50) of the fourth hydraulic cylinder, a first one-way throttle valve (35) is arranged between the fifth one-way valve (41) and the third rodless chamber (36), a third one-way throttle valve (48) is arranged between the fifth one-way valve (41) and the fourth rodless chamber (50), the third rod chamber (37) of the third hydraulic cylinder is connected to the oil tank (1), and the fourth rod chamber (49) of the fourth hydraulic cylinder is connected to the oil tank (1); The third oil pressure mechanism is connected to the oil inlet of the sixth one-way valve (44); the oil outlet of the sixth one-way valve (44) is connected to the P port of the two-position three-way electromagnetic reversing valve (39); the A port of the two-position three-way electromagnetic reversing valve (39) is connected to the control oil port of the hydraulically controlled one-way valve (52); the oil outlet of the hydraulically controlled one-way valve (52) is connected to the oil tank (1); the oil inlet of the hydraulically controlled one-way valve (52) is connected to the first throttle valve (51); the first throttle valve (51) is connected to the first one-way throttle valve (35) and the third one-way throttle valve (48).

2. The hydraulic system of a rolling device according to claim 1, characterized in that: The first oil pressure mechanism is connected to the inlet end of the first non-return valve (4), the outlet end of the first non-return valve (4) is connected to the P port of the first three-position four-way electromagnetic reversing valve (7), the A port of the first three-position four-way electromagnetic reversing valve (7) is connected to the first pressure monitoring mechanism, the first pressure monitoring mechanism is connected to the first rodless chamber (12) of the first hydraulic cylinder, the first rod chamber (13) of the first hydraulic cylinder is connected to the B port of the first three-position four-way electromagnetic reversing valve (7) through the third stop valve (14), the T port of the first three-position four-way electromagnetic reversing valve (7) is connected to the inlet end of the fourth non-return valve (33), the outlet end of the fourth non-return valve (33) is connected to the oil tank (1), and a first electromagnetic overflow valve (3) is connected in parallel between the inlet end of the first non-return valve (4) and the outlet end of the fourth non-return valve (33).

3. The hydraulic system of a roller pressing device according to claim 2, characterized in that: The second oil pressure mechanism is connected to the inlet end of the third one-way valve (31), the outlet end of the third one-way valve (31) is connected to the P port of the second three-position four-way electromagnetic reversing valve (24), the A port of the second three-position four-way electromagnetic reversing valve (24) is connected to the second pressure monitoring mechanism, the second pressure monitoring mechanism is connected to the second rodless chamber (20) of the second hydraulic cylinder, the second rod chamber (21) of the second hydraulic cylinder is connected to the B port of the second three-position four-way electromagnetic reversing valve (24) through the seventh stop valve (22), the T port of the second three-position four-way electromagnetic reversing valve (24) is connected to the inlet end of the second one-way valve (28), the outlet end of the second one-way valve (28) is connected to the oil tank (1), and a second electromagnetic overflow valve (29) is connected in parallel between the outlet end of the second one-way valve (28) and the inlet end of the third one-way valve (31).

4. The hydraulic system of a roller pressing device according to claim 3, characterized in that: The first rod chamber (13) and the second rod chamber (21) are both in communication with a manual pump (32), and the manual pump (32) is in communication with the oil tank (1).

5. The hydraulic system of a rolling device according to claim 3, characterized in that: The outlet end of the first one-way valve (4) is connected to a first stop valve (5), and the first stop valve (5) is connected to a first pressure gauge (6); The outlet end of the third one-way valve (31) is connected to a ninth stop valve (27), and the ninth stop valve (27) is connected to a second pressure gauge (26).

6. The hydraulic system of a roller pressing device according to claim 5, characterized in that: A fourth stop valve (15) is connected in parallel between the outlet end of the first one-way valve (4) and the oil tank (1), a sixth stop valve (17) is connected in parallel between the outlet end of the third one-way valve (31) and the oil tank (1), and the fourth stop valve (15) is in communication with the sixth stop valve (17).

7. The hydraulic system of a rolling device according to claim 1, characterized in that: The inlet end of the first throttle valve (51) is connected to the A port of the two-position three-way manual reversing valve (34), and the T port of the two-position three-way manual reversing valve (34) is connected to the oil tank (1).

8. A rolling device, characterized in that: A hydraulic system comprising the rolling device according to any one of claims 1 to 7.

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