An energy-saving hydraulic system for an internal mixer that controls pressure and flow using a servo motor

Abstract

The present invention provides an energy-saving hydraulic system for a mixer that controls pressure and flow by a servo motor, which relates to the technical field of hydraulic control systems and includes an oil tank, an energy-saving oil supply unit, an upper plug hydraulic control circuit, an auxiliary hydraulic control circuit, and a circulating cooling and filtering device; the energy-saving oil supply unit includes a high-pressure pump unit and a low-pressure pump unit, and the upper plug hydraulic control circuit includes an upper plug hydraulic control valve group and an upper plug energy storage device; the auxiliary hydraulic control circuit includes an auxiliary hydraulic control valve group, an auxiliary energy storage device, an auxiliary oil return filter, and a manual emergency operation device, and the auxiliary hydraulic control valve group includes an auxiliary hydraulic control oil circuit block, an upper plug auxiliary unit, a locking pin control unit, a feeding door control unit, a discharging door control unit, and a plurality of rotor seal control units arranged in parallel. The present invention can provide appropriate pressure and flow according to the actual needs in each stage of the working process of the mixer, reduce energy loss, and improve the energy-saving effect of the hydraulic control system.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control systems, and particularly to an energy-saving internal mixer hydraulic system for controlling pressure and flow by a servo motor. Background Art

[0002] An internal mixer is the main equipment used in the mixing and processing production of rubber products, mainly composed of an internal mixing chamber, a feeding and pressing device, a discharging device, a transmission device, etc. The upper plug, as the core component of the internal mixer, mainly functions to provide a stable pressure to the rubber material in the internal mixing chamber through the upper plug, and it is required that the pressure of the upper plug changes with the volume change of the rubber material. When the internal mixer is working, it mainly uses a hydraulic control system to control the lifting of the upper plug, the floating of the upper plug, rubber mixing, locking pin locking, locking pin loosening, opening and closing of the feeding door, opening and closing of the discharging door, etc.

[0003] The traditional internal mixer hydraulic system mainly uses a variable pump and a proportional servo valve in cooperation for hydraulic control to achieve a certain energy-saving effect. However, during the operation process, due to the high frequency and large amplitude of the pressure and flow changes, there are still large energy losses in the hydraulic control system. Therefore, it is necessary to design an energy-saving internal mixer hydraulic system for controlling pressure and flow by a servo motor to further improve the energy-saving effect of the internal mixer hydraulic control system. Summary of the Invention

[0004] The purpose of the present invention is to provide an energy-saving internal mixer hydraulic system for controlling pressure and flow by a servo motor, which can provide appropriate pressure and flow according to the actual needs of each stage in the working process of the internal mixer, reduce energy losses, and improve the energy-saving effect of the hydraulic control system.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions:

[0006] An energy-saving internal mixer hydraulic system for controlling pressure and flow by a servo motor includes an oil tank and an energy-saving oil supply unit, an upper plug hydraulic control circuit, an auxiliary hydraulic control circuit, and a circulating cooling and filtering device that are connected to the oil tank to form a closed-loop circuit;

[0007] The energy-saving oil supply unit includes a high-pressure pump unit and a low-pressure pump unit. The upper plug hydraulic control circuit includes an upper plug hydraulic control valve group and an upper plug energy storage device. The high-pressure pump unit and the upper plug hydraulic control circuit cooperate to control the slow lifting and lowering of the upper plug cylinder. The upper plug energy storage device supplements pressure and recovers energy for the upper plug cylinder during rubber mixing.

[0008] The auxiliary hydraulic control circuit includes an auxiliary hydraulic control valve group, an auxiliary energy storage device, an auxiliary oil return filter, and a manual emergency operation device. The auxiliary hydraulic control valve group includes an auxiliary hydraulic control oil circuit block, an upper plug auxiliary unit, a locking pin control unit, a charging door control unit, a discharging door control unit, and a plurality of rotor seal control units arranged in parallel;

[0009] The high-pressure pump unit cooperates with the upper plug hydraulic control circuit, and the low-pressure pump unit cooperates with the upper plug auxiliary unit to jointly control the rapid lifting and lowering of the upper plug cylinder. The auxiliary energy storage device provides flow and pressure for the locking pin control unit, the charging door control unit, the discharging door control unit, and a plurality of rotor seal control units during their operation. The low-pressure pump unit replenishes hydraulic oil for the auxiliary energy storage device when the hydraulic oil in it is insufficient. The circulating cooling and filtering device cools down the high-pressure pump unit and the low-pressure pump unit of the energy-saving oil supply unit;

[0010] The locking pin control unit controls the locking pin cylinder to work to lock or release the locking pin. The charging door control unit controls the charging door cylinder to work to open or close the charging door. The discharging door control unit controls the discharging cylinder to open or close the discharging door. The rotor seal control unit always seals during the operation of the rotor seal cylinder;

[0011] The auxiliary oil return filter filters the hydraulic oil returned to the oil tank by the auxiliary hydraulic control circuit. The manual emergency operation device performs manual control after the locking pin control unit and the discharging door control unit fail.

[0012] Further, the high-pressure pump unit includes a high-pressure servo motor and a high-pressure gear pump. The high-pressure servo motor drives the high-pressure gear pump to work. The inlet of the high-pressure gear pump is connected to the oil tank, and the outlet is connected to the upper plug hydraulic control valve group;

[0013] The upper plug hydraulic control valve group includes an upper plug hydraulic control oil circuit block, an upper plug rising control valve, an upper plug falling control valve, an electronic control safety valve, a second overflow valve, a first one-way valve, a quick-falling oil return unit, and a slow-falling oil return unit;

[0014] The upper plug hydraulic control oil circuit block is provided with oil ports GP, GB, DF, A1, B1, C1, and pressure measurement ports M16, M20. The oil port A1 is communicated with the rodless cavity of the upper plug cylinder. The oil port B1 is communicated with the rod cavity of the upper plug cylinder. The oil port GP is communicated with the pressure measurement port M16 and the oil port GB. The oil port B1 is communicated with the pressure measurement port M20 and the oil port C1. The oil port GP is communicated with the outlet of the high-pressure gear pump. The pressure measurement port M16 detects the output pressure of the high-pressure gear pump. The pressure measurement port M20 detects the pressure of the upper plug cylinder;

[0015] The inlet port of the second relief valve communicates with the oil port GP, and the outlet port communicates with the fuel tank; the upper plug hydraulic control oil circuit block is also provided with a first pressure sensor, a second pressure sensor and a third pressure sensor for respectively detecting the pressures of the oil ports GP, A1, and B1, and the first pressure sensor is communicatively feedback controlled and connected to the high-pressure servo motor;

[0016] The upper plug rising control valve is provided with a working oil port SA, a working oil port SB, a control oil port SX, a control oil port SZ, and a drain oil port SY. The working oil port SA communicates with the control oil port SZ, the oil port GP on the upper plug hydraulic control oil circuit block, and the oil port DF. And a first check valve is connected between the working oil port SA and the oil port GP; the working oil port SB communicates with the oil port A1 and the control oil port SX, and the drain oil port SY communicates with the fuel tank;

[0017] The upper plug descending control valve is provided with a working oil port XA, a working oil port XB, a control oil port XX, a control oil port XZ, and a drain oil port XY. The working oil port XA communicates with the control oil port XZ, the working oil port SA of the upper plug rising control valve, and the oil ports GP and DF on the upper plug hydraulic control oil circuit block. And the first check valve connects the oil port GP and the working oil port XA; the working oil port XB communicates with the control oil port XX and the oil port B1 on the upper plug hydraulic control oil circuit block, and the drain oil port XY communicates with the fuel tank;

[0018] The electric control safety valve is provided with a working oil port HA, a working oil port HB, a control oil port HX, and a drain oil port HY. The working oil port HA communicates with the working oil port XB of the upper plug descending control valve, the working oil port HB communicates with the drain oil port HY and the fuel tank, and a first relief valve is provided between the control oil port HX and the oil port GP on the upper plug hydraulic control oil circuit block;

[0019] The rapid descent unit includes a first pilot-operated check valve and a first electromagnetic directional valve. The first pilot-operated check valve is provided with a working oil port KA, a working oil port KB, a control oil port KX, and a drain oil port KY. The first electromagnetic directional valve is provided with an inlet port EP, a working oil port EA, a working oil port EB, and a return oil port ET; the working oil port KA of the first pilot-operated check valve communicates with the fuel tank, the working oil port KB communicates with the oil port A1 on the upper plug hydraulic control oil circuit block, the control oil port KX communicates with the working oil port EB of the first electromagnetic directional valve, and the drain oil port KY communicates with the return oil port ET of the first electromagnetic directional valve and then communicates with the fuel tank; the working oil port EA of the first electromagnetic directional valve is blocked, and the inlet port EP communicates with the oil port GP on the upper plug hydraulic control oil circuit block;

[0020] The slow descent and oil return unit includes a second hydraulic check valve, a second electromagnetic directional valve, a descent throttle valve, and a back pressure valve. The second hydraulic check valve is provided with a working oil port MA, a working oil port MB, a control oil port MX, and a drain oil port MY. The second electromagnetic directional valve is provided with an oil inlet LP, a working oil port LA, a working oil port LB, and an oil return port LT. The working oil port MA of the second hydraulic check valve communicates with the fuel tank through the back pressure valve. The working oil port MB communicates with the oil port A1 on the hydraulic control oil block of the upper plug through the descent throttle valve. The control oil port MX communicates with the working oil port LB of the second electromagnetic directional valve. The drain oil port MY communicates with the oil return port LT of the second electromagnetic directional valve and also communicates with the fuel tank. The working oil port LA of the second electromagnetic directional valve is blocked, and the oil port LP communicates with the oil port GP on the hydraulic control oil block of the upper plug.

[0021] The hydraulic control oil block of the upper plug is also provided with a second one-way valve, a third one-way valve, and a third overflow valve. The second one-way valve is provided with a working oil port SP communicating with the oil port A1 and a working oil port ST communicating with the fuel tank. The third one-way valve is provided with a working oil port SP communicating with the oil port B1 and an oil port ST communicating with the fuel tank. The third overflow valve is provided with an oil inlet AP communicating with the oil port A1 and an oil return port AT communicating with the fuel tank.

[0022] Furthermore, the upper plug energy storage device includes an upper plug energy storage oil block, an upper plug accumulator, a fourth overflow valve, a second manual ball valve, a one-way plug-in, and a first electromagnetic ball valve.

[0023] The upper plug energy storage oil block is provided with an oil port NA, an oil port NB, and an oil port NE. The oil port NA is connected to the oil port C1 of the hydraulic control oil block of the upper plug. The oil port NB is connected to the fuel tank. The oil port NE is connected to the upper plug accumulator. The oil port NE also communicates with the oil port NB through the second manual ball valve and the fourth overflow valve. The second manual ball valve and the fourth overflow valve are arranged in parallel, and the second manual ball valve is in a normally closed state.

[0024] The one-way plug-in is provided with a working oil port JA, a working oil port JB, and a control oil port JX. The first electromagnetic ball valve is provided with an oil inlet QP, a working oil port QA, and an oil return port QT. The working oil port JA of the one-way plug-in and the oil inlet QP of the first electromagnetic ball valve communicate with the oil port NE respectively. The working oil port JB of the one-way plug-in communicates with the oil port NA on the upper plug energy storage oil block. The working oil port QA of the first electromagnetic ball valve communicates with the control oil port JX of the one-way plug-in. The oil return port QT of the first electromagnetic ball valve communicates with the oil port NB on the upper plug energy storage oil block.

[0025] Furthermore, the low-pressure pump unit includes a low-pressure servo motor and a low-pressure gear pump. The low-pressure servo motor drives the low-pressure gear pump to work. The oil inlet of the low-pressure gear pump communicates with the fuel tank, and the oil outlet is connected to the auxiliary hydraulic control valve group.

[0026] The auxiliary hydraulic control oil circuit block is provided with an oil port DP, an oil port DN, an oil port FD, an oil port BG, and pressure measurement ports M2 and M3; the upper plug auxiliary unit includes a large flow cut-off valve and a fourth one-way valve. The large flow cut-off valve is provided with a working oil port DA, a working oil port DB, a control oil port DX, a control oil port DZ, and a drain oil port DY;

[0027] The oil port DP of the auxiliary hydraulic control oil circuit block communicates with the oil outlet of the low-pressure gear pump and the pressure measurement ports M2, and the oil port DP is connected with a fourth pressure sensor for detecting its pressure. The fourth pressure sensor is communicatively feedback-controlled and connected to the low-pressure servo motor. The oil port DN communicates with the oil port BG and the pressure measurement port M3; a fifth one-way valve and a damping joint for connecting them are provided between the oil port BG and the oil port GB of the upper plug hydraulic control oil circuit block, and the fifth one-way valve is close to the oil port BG; the oil port FD is communicated with the oil port DF of the upper plug hydraulic control oil circuit block;

[0028] The working oil port DA and the control oil port DZ of the large flow cut-off valve communicate with the oil port DP of the auxiliary hydraulic control oil circuit block, and the working oil port DA and the oil port DP are communicated through a fourth one-way valve; the working oil port DB and the control oil port DX of the large flow switching valve communicate with the oil port FD of the auxiliary hydraulic control oil circuit block, and the drain oil port DY communicates with the fuel tank.

[0029] Further, the auxiliary energy storage device includes an auxiliary energy storage oil circuit block, an auxiliary accumulator, a seventh overflow valve, a third manual ball valve, a second electromagnetic ball valve, and a fourth manual ball valve. The auxiliary energy storage oil circuit block is provided with an oil port NC, an oil port ND, and an oil port NF;

[0030] The oil port NC of the auxiliary energy storage oil circuit block communicates with the oil port DN on the auxiliary hydraulic control oil circuit block. The oil port ND is connected to the fuel tank, and a seventh overflow valve is also connected between the oil port ND and the oil port NC; the auxiliary accumulator is connected to the oil port NF, and a second electromagnetic ball valve and a third manual ball valve arranged in parallel are also connected between the oil port NF and the oil port ND, and the third manual ball valve is in a normally closed state; a fourth manual ball valve is connected between the oil port NF and the oil port NC, and the fourth manual ball valve is in a normally open state;

[0031] The auxiliary hydraulic control oil circuit block is further provided with an oil port FT, an oil port A4, an oil port B4, and a pressure measurement port M5. The oil port FT and the fuel tank are communicated through an auxiliary oil return filter. The oil port A4 communicates with the rodless cavity of the locking pin cylinder and the pressure measurement port M5. The pressure measurement port M5 detects the pressure of the locking pin cylinder. The oil port B4 communicates with the rod chamber of the locking pin cylinder;

[0032] The lock pin control unit includes a sixth one-way valve, a first one-way throttle valve, a third one-way throttle valve, an electro-hydraulic reversing valve, and a first pressure reducing valve. The electro-hydraulic reversing valve is provided with a first working oil port YA, a second working oil port YB, an oil inlet YP, and an oil return port YT. The first working oil port YA is connected to the oil port A4 of the auxiliary hydraulic control oil block through the first one-way throttle valve and the first pressure reducing valve. The second working oil port YB is connected to the oil port B4 of the auxiliary hydraulic control oil block through the third one-way throttle valve. The oil inlet YP is connected to the oil port DN of the auxiliary hydraulic control oil block through the sixth one-way valve. The oil return port YT is connected to the oil port FT of the auxiliary hydraulic control oil block.

[0033] Further, the auxiliary hydraulic control oil block is further provided with an oil port A3, an oil port B3, and a pressure measuring port M7. The oil port A3 is connected to the rodless cavity of the feeding door cylinder and the pressure measuring port M7. The pressure measuring port M7 detects the pressure of the feeding door cylinder. The oil port B3 is connected to the rod cavity of the feeding door cylinder.

[0034] The feeding door control unit includes a second one-way throttle valve, a fourth one-way throttle valve, a second pressure reducing valve, and a third electromagnetic reversing valve. The third electromagnetic reversing valve is provided with an oil inlet RP, an oil return port RT, a first working oil port RA, and a second working oil port RB. The oil inlet RP is connected to the oil port DN of the auxiliary hydraulic control oil block through the second pressure reducing valve. The oil return port RT is connected to the oil port FT of the auxiliary hydraulic control oil block. The first working oil port RA is connected to the oil port A3 of the auxiliary hydraulic control oil block through the second one-way throttle valve. The second working oil port RB is connected to the oil port B3 of the auxiliary hydraulic control oil block through the fourth one-way throttle valve.

[0035] Further, the auxiliary hydraulic control oil block is further provided with an oil port A2, an oil port B2, and a pressure measuring port M9. The oil port A2 is connected to the pressure measuring port M9.

[0036] The discharge door cylinder includes a first cylinder and a second cylinder with opposite piston rods, and a third cylinder and a fourth cylinder with opposite piston rods. The third cylinder is located on one side of the first cylinder and their piston rods are parallel to each other. The fourth cylinder is located on one side of the second cylinder and their piston rods are parallel to each other. The discharge door cylinder expands and contracts to drive the discharge door to rotate and open or close. The rodless cavity of the first cylinder is PE, the rodless cavity of the second cylinder is PC, the rodless cavity of the third cylinder is PD, and the rodless cavity of the fourth cylinder is PF. The oil port A2 on the auxiliary hydraulic control oil block is connected to PC and PD, and the oil port B2 is connected to PE and PF.

[0037] The discharge door control unit includes a fifth overflow valve, a sixth overflow valve and an electro-hydraulic proportional direction valve. The electro-hydraulic proportional direction valve is provided with an oil inlet PP, an oil return port PT, a first working oil port PA, and a second working oil port PB. The oil inlet PP is communicated with the oil port DN of the auxiliary hydraulic control oil circuit block, the oil return port PT is communicated with the oil port FT of the auxiliary hydraulic control oil circuit block, the first working oil port PA is communicated with the oil port A2 of the auxiliary hydraulic control oil circuit block, and the second working oil port PB is communicated with the oil port B2 of the auxiliary hydraulic control oil circuit block. A connection is made between the first working oil port PA and the oil return port PT through the sixth overflow valve, and a connection is made between the second working oil port PB and the oil return port PT through the fifth overflow valve.

[0038] Further, a plurality of oil ports A5 and a plurality of pressure measurement ports M10 respectively corresponding to and communicated with the oil ports A5 are also provided on the auxiliary hydraulic control oil circuit block. Each rotor seal control unit includes a seventh one-way valve and a third pressure reducing valve. The oil port DN on the auxiliary hydraulic control oil circuit block is sequentially communicated with the oil port A5 through the seventh one-way valve, the third pressure reducing valve, and the oil port A5 is communicated with the rodless cavities of a plurality of rotor seal cylinders, and the pressure measurement port M10 detects the pressure of the rotor seal cylinders.

[0039] Further, the auxiliary hydraulic control oil circuit block is also provided with an oil port CA, an oil port CB, an oil port CC, and an oil port CD. The oil port CA is communicated with the oil port A4 and the pressure measurement port M5, the oil port CB is communicated with the oil port B4, the oil port CC is communicated with the oil port A2 and the pressure measurement port M9, and the oil port CD is communicated with the oil port B2.

[0040] The manual emergency operation device includes a manual pump, a fifth manual ball valve, an eighth one-way valve, a sixth manual ball valve and a ninth one-way valve. The oil inlet of the manual pump is connected to the fuel tank, and the oil outlet is respectively communicated with the oil port CB and the oil port CD on the auxiliary hydraulic control oil circuit block through the eighth one-way valve and the ninth one-way valve. The fifth manual ball valve connects the oil port CA on the auxiliary hydraulic control oil circuit block and the fuel tank, and the sixth manual ball valve connects the oil port CC on the auxiliary hydraulic control oil circuit block and the fuel tank.

[0041] Further, the circulating cooling and filtering device includes a motor, a hydraulic pump, a cooling filter, a cooler, a water filter, a first manual ball valve, a tenth one-way valve, a high-pressure throttle valve and a low-pressure throttle valve. The hydraulic pump is respectively connected to the fuel tank, the motor, and the cooler. The cooler is also respectively connected to the water filter, the high-pressure throttle valve and the low-pressure throttle valve. The high-pressure throttle valve and the low-pressure throttle valve are respectively communicated with the oil inlets of the high-pressure servo motor and the low-pressure servo motor. A tenth one-way valve, a first manual ball valve and a cooling filter are sequentially connected between the cooler and the fuel tank, and the cooling filter is close to the fuel tank.

[0042] In summary, the present invention has the following beneficial effects:

[0043] 1. The present invention can provide appropriate pressure and flow for the internal mixer according to the actual requirements at each stage during its working process through an energy-saving oil supply unit, improving the energy-saving effect of the hydraulic control system of the internal mixer.

[0044] 2. Through the cooperation of the energy-saving oil supply unit with the hydraulic control circuit of the upper plug and the auxiliary hydraulic control circuit, the present invention realizes the control of the rapid rise, rapid fall, slow rise, slow fall and floating of the upper plug, and ensures the stable pressure difference during the rubber mixing process.

[0045] 3. Through the auxiliary hydraulic control circuit, the present invention realizes the control of the loosening or locking of the locking pin, the opening or closing of the feeding door, the quick opening, slow opening, quick closing and slow closing of the discharging door, and the always-sealed rotor seal, and sets a manual emergency operation device as a backup when the locking pin control unit and the discharging door control unit fail, improving safety.

[0046] 4. In the present invention, the high-pressure pump unit can compensate for the leakage of the auxiliary accumulator, and the circulating cooling and filtering device can cool the energy-saving oil supply unit, ensuring the working safety and service life of the energy-saving oil supply unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic diagram of an energy-saving hydraulic system of an internal mixer controlled by a servo motor for pressure and flow;

[0048] Figure 2 is a schematic diagram of the circulating cooling and filtering device and the energy-saving oil supply unit in an energy-saving hydraulic system of an internal mixer controlled by a servo motor for pressure and flow;

[0049] Figure 3 is a schematic diagram of the hydraulic control circuit of the upper plug in an energy-saving hydraulic system of an internal mixer controlled by a servo motor for pressure and flow;

[0050] Figure 4 is a schematic diagram of the hydraulic control circuit of the upper plug and the upper plug auxiliary unit in an energy-saving hydraulic system of an internal mixer controlled by a servo motor for pressure and flow;

[0051] Figure 5 is a schematic diagram of the auxiliary hydraulic control circuit in an energy-saving hydraulic system of an internal mixer controlled by a servo motor for pressure and flow.

[0052] In the figure, 1. Oil tank; 2. Electric contact thermometer; 3. Magnet; 4. Air filter; 5. Liquid level gauge; 6. Liquid level control relay;

[0053] 01. Circulating cooling and filtering device; 7. Motor; 8. Hydraulic pump; 9. Cooling filter; 10. Cooler; 11. Water filter; 12. First manual ball valve; 13. Tenth one-way valve;

[0054] 02. Energy-saving oil supply unit; 021. High-pressure pump unit; 14. High-pressure servo motor; 15. High-pressure gear pump; 16. High-pressure throttle valve; 022. Low-pressure pump unit; 17. Low-pressure servo motor; 18. Low-pressure gear pump; 19. Low-pressure throttle valve;

[0055] 03. Hydraulic control circuit for upper plug; 031. Hydraulic control valve group for upper plug; 21. Hydraulic control oil circuit block for upper plug; 22. Upper plug rising control valve; 23. Upper plug descending control valve; 24. Electric control safety valve; 25. First overflow valve; 26. Second overflow valve; 27. First pressure sensor; 28. First check valve; 0311. Quick descent oil return unit; 29. First pilot-operated check valve; 30. First electromagnetic directional valve; 0312. Slow descent oil return unit; 31. Second pilot-operated check valve; 32. Second electromagnetic directional valve; 33. Descent throttle valve; 34. Back pressure valve; 35. Third overflow valve; 36. Second check valve; 37. Third check valve; 38. Second pressure sensor; 39. Third pressure sensor; 032. Energy storage device for upper plug; 40. Upper plug accumulator; 41. Fourth overflow valve; 42. Second manual ball valve; 43. One-way plug-in; 44. First electromagnetic ball valve; 45. Energy storage oil circuit block for upper plug;

[0056] 04. Auxiliary hydraulic control circuit; 041. Auxiliary hydraulic control valve group; 46. Auxiliary hydraulic control oil circuit block; 0411. Upper plug auxiliary unit; 47. Large flow cut-off valve; 48. Fourth check valve; 49. Fifth check valve; 50. Fourth pressure sensor; 0412. Lock pin control unit; 51. Sixth check valve; 52. First one-way throttle valve; 521. Third one-way throttle valve; 53. Electro-hydraulic directional valve; 54. First pressure reducing valve; 0413. Feeding door control unit; 55. Second one-way throttle valve; 551. Fourth one-way throttle valve; 56. Second pressure reducing valve; 57. Third electromagnetic directional valve; 0414. Discharging door control unit; 58. Fifth overflow valve; 59. Sixth overflow valve; 60. Electro-hydraulic proportional direction valve; 0415. Rotor seal control unit; 61. Seventh check valve; 62. Third pressure reducing valve;

[0057] 042. Manual emergency operation device; 20. Manual pump; 63. Fifth manual ball valve; 64. Eighth check valve; 65. Sixth manual ball valve; 66. Ninth check valve;

[0058] 043. Auxiliary energy storage device; 67. Auxiliary accumulator; 68. Third manual ball valve; 69. Second electromagnetic ball valve; 70. Fourth manual ball valve; 71. Seventh overflow valve; 72. Auxiliary energy storage oil circuit block; 83. Auxiliary oil return filter; 84. Damping joint;

[0059] 73. Pressure relay; 74. First pressure gauge; 75. Second pressure gauge; 76. Third pressure gauge; 77. Fourth pressure gauge; 78. Fifth pressure gauge; 79. Sixth pressure gauge; 80. Electric contact pressure gauge; 81. Spare pressure gauge; 82. Instrument panel

[0060] 05. Upper plug cylinder; 06. Lock pin cylinder; 07. Feeding door cylinder; 08. Discharging door cylinder; 081. First cylinder; 082. Second cylinder; 083. Third cylinder; 084. Fourth cylinder; 09. Rotor seal cylinder Detailed implementation manners

[0061] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention

[0062] An energy-saving hydraulic system for a mixer with servo motor controlling pressure and flow rate, as Figure 1 shown, includes an oil tank 1, an energy-saving oil supply unit 02, an upper plug hydraulic control circuit 03, an auxiliary hydraulic control circuit 04, and a circulating cooling and filtering device 01 that are connected to the oil tank 1 to form a closed-loop circuit. The oil tank 1 is connected with accessories such as an electric contact thermometer 2, a magnet 3, an air filter 4, a liquid level gauge 5, a liquid level control relay 6, etc., to ensure the normal oil supply and oil return filtration and other basic functions of the oil tank 1

[0063] As Figure 1 shown, the energy-saving oil supply unit 02 includes a high-pressure pump unit 021 and a low-pressure pump unit 022, and the circulating cooling and filtering device 01 cools and reduces the temperature of the high-pressure pump unit 021 and the low-pressure pump unit 022 of the energy-saving oil supply unit 02 and the hydraulic oil in the oil tank 1. The upper plug hydraulic control circuit 03 includes an upper plug hydraulic control valve group 031 and an upper plug energy storage device 032. The high-pressure pump unit 021 and the upper plug hydraulic control circuit 03 cooperate to control the slow lifting and lowering of the upper plug cylinder 05, and the upper plug energy storage device 032 supplements pressure and recovers energy for the upper plug cylinder 05 during rubber mixing

[0064] As Figure 1 shown, the auxiliary hydraulic control circuit 04 includes an auxiliary hydraulic control valve group 041, an auxiliary energy storage device 043, an auxiliary oil return filter 83, and a manual emergency operation device 042. The auxiliary hydraulic control valve group 041 includes an auxiliary hydraulic control oil circuit block 46, an upper plug auxiliary unit 0411, a lock pin control unit 0412, a feeding door control unit 0413, a discharging door control unit 0414, and a plurality of rotor seal control units 0415 arranged in parallel

[0065] As Figure 1As shown in the figure, the high-pressure pump unit 021 cooperates with the upper plug hydraulic control circuit 03, and the low-pressure pump unit 022 cooperates with the upper plug auxiliary unit 0411 to jointly control the rapid lifting and lowering of the upper plug cylinder 05; the auxiliary energy storage device 043 provides flow and pressure for the pin control unit 0412, the feeding door control unit 0413, the discharging door control unit 0414, and several rotor seal control units 0415 during their operation, and the low-pressure pump unit 022 replenishes hydraulic oil for the auxiliary energy storage device 043 when the hydraulic oil in it is insufficient. The pin control unit 0412 controls the pin cylinder 06 to work to lock or release the pin, the feeding door control unit 0413 controls the feeding door cylinder 07 to work to open or close the feeding door, the discharging door control unit 0414 controls the discharging cylinder to open or close the discharging door, and the rotor seal control unit 0415 controls the rotor seal cylinder 09 to always perform sealing. The auxiliary oil return filter 83 filters the hydraulic oil returned to the oil tank 1 by the auxiliary hydraulic control circuit 04, and the manual emergency operation device 042 performs manual control after the pin control unit 0412 and the discharging door control unit 0414 fail.

[0066] The specific structures of the energy-saving oil supply unit 02, the upper plug hydraulic control circuit 03, the auxiliary hydraulic control circuit 04, and the circulating cooling and filtering device 01 are described in detail below. Among them, the connection of the following oil circuits is all through pipelines, and no more details will be elaborated.

[0067] As Figure 2 shown in the figure, the high-pressure pump unit 021 includes a high-pressure servo motor 14 with an in-built encoder and a high-pressure gear pump 15. The inlet of the high-pressure gear pump 15 is connected to the oil tank 1, and the outlet is connected to the upper plug hydraulic control valve group 031. The high-pressure servo motor 14 drives the high-pressure gear pump 15 to work, sending the hydraulic oil in the oil tank 1 into the upper plug hydraulic control valve group 031. The low-pressure pump unit 022 includes a low-pressure servo motor 17 with an in-built encoder and a low-pressure gear pump 18. The inlet of the low-pressure gear pump 18 is connected to the oil tank 1, and the outlet is connected to the auxiliary hydraulic control valve group 041. The low-pressure servo motor 17 drives the low-pressure gear pump 18 to work, sending the hydraulic oil in the oil tank 1 into the auxiliary hydraulic control valve group 041.

[0068] As Figure 3 shown in the figure, the upper plug hydraulic control valve group 031 includes an upper plug hydraulic control oil circuit block 21, an upper plug rising control valve 22, an upper plug falling control valve 23, an electronically controlled safety valve 24, a second overflow valve 26, a first check valve 28, a rapid falling oil return unit 0311, and a slow falling oil return unit 0312.

[0069] As Figure 3As shown in the figure, the upper plug hydraulic control oil circuit block 21 is provided with oil ports GP, GB, DF, A1, B1, C1 and pressure measuring ports M16, M20. The oil port A1 is communicated with the rodless cavity of the upper plug cylinder 05, the oil port B1 is communicated with the rod cavity of the upper plug cylinder 05, the oil port GP is communicated with the pressure measuring port M16 and the oil port GB, the oil port B1 is communicated with the pressure measuring port M20 and the oil port C1, and the pressure measuring port M20 detects the pressure of the upper plug cylinder 05. As Figure 4 shown, the oil port GP is communicated with the oil outlet of the high-pressure gear pump 15, and the pressure measuring port M16 detects the output pressure of the high-pressure gear pump 15. As Figure 3 shown, the inlet oil port of the second overflow valve 26 is communicated with the oil port GP, and the outlet oil port is communicated with the fuel tank 1. The upper plug hydraulic control oil circuit block 21 is also provided with a first pressure sensor 27, a second pressure sensor 38 and a third pressure sensor 39 for respectively detecting the pressures of the oil ports GP, A1, B1, and the first pressure sensor 27 is communicatively feedback controlled and connected to the high-pressure servo motor 14.

[0070] As Figure 3 shown, the upper plug rising control valve 22 is provided with a working oil port SA, a working oil port SB, a control oil port SX, a control oil port SZ, and a drain oil port SY. The working oil port SA is communicated with the control oil port SZ, the oil port GP on the upper plug hydraulic control oil circuit block 21, and the oil port DF, and a first one-way valve 28 is communicated between the working oil port SA and the oil port GP; the working oil port SB is communicated with the oil port A1 and the control oil port SX, and the drain oil port SY is communicated with the fuel tank 1.

[0071] As Figure 3 shown, the upper plug descending control valve 23 is provided with a working oil port XA, a working oil port XB, a control oil port XX, a control oil port XZ, and a drain oil port XY. The working oil port XA is communicated with the control oil port XZ, the working oil port SA of the upper plug rising control valve 22, and the oil port GP on the upper plug hydraulic control oil circuit block 21, and the oil port DF, and the first one-way valve 28 is communicated between the oil port GP and the working oil port XA; the working oil port XB is communicated with the control oil port XX and the oil port B1 on the upper plug hydraulic control oil circuit block 21, and the drain oil port XY is communicated with the fuel tank 1.

[0072] As Figure 3 shown, the electric control safety valve 24 is provided with a working oil port HA, a working oil port HB, a control oil port HX, and a drain oil port HY. The working oil port HA is communicated with the working oil port XB of the upper plug descending control valve 23, the working oil port HB is communicated with the drain oil port HY and the fuel tank 1, and a first overflow valve 25 is provided between the control oil port HX and the oil port GP on the upper plug hydraulic control oil circuit block 21 to ensure that the pressure difference between the overflow pressure of the electric control safety valve 24 and the real-time pressure during the operation of the upper plug is constant due to the pressure change during the operation of the upper plug.

[0073] As Figure 3As shown in the figure, the rapid descent unit includes a first hydraulic check valve 29 and a first electromagnetic directional control valve 30. The first hydraulic check valve 29 is provided with a working oil port KA, a working oil port KB, a control oil port KX, and a drain oil port KY. The first electromagnetic directional control valve 30 is provided with an oil inlet EP, a working oil port EA, a working oil port EB, and a return oil port ET. The working oil port KA of the first hydraulic check valve 29 communicates with the fuel tank 1, the working oil port KB communicates with the oil port A1 on the hydraulic control oil circuit block 21 of the upper plug, the control oil port KX communicates with the working oil port EB of the first electromagnetic directional control valve 30, and the drain oil port KY communicates with the return oil port ET of the first electromagnetic directional control valve 30 and also communicates with the fuel tank 1. The working oil port EA of the first electromagnetic directional control valve 30 is blocked, and the oil inlet EP communicates with the oil port GP on the hydraulic control oil circuit block 21 of the upper plug.

[0074] As Figure 3 shown in the figure, the slow descent oil return unit 0312 includes a second hydraulic check valve 31, a second electromagnetic directional control valve 32, a descent throttle valve 33, and a back pressure valve 34. The second hydraulic check valve 31 is provided with a working oil port MA, a working oil port MB, a control oil port MX, and a drain oil port MY. The second electromagnetic directional control valve 32 is provided with an oil inlet LP, a working oil port LA, a working oil port LB, and a return oil port LT. The working oil port MA of the second hydraulic check valve 31 communicates with the fuel tank 1 through the back pressure valve 34, the working oil port MB communicates with the oil port A1 on the hydraulic control oil circuit block 21 of the upper plug through the descent throttle valve 33, the control oil port MX communicates with the working oil port LB of the second electromagnetic directional control valve 32, and the drain oil port MY communicates with the return oil port LT of the second electromagnetic directional control valve 32 and also communicates with the fuel tank 1. The working oil port LA of the second electromagnetic directional control valve 32 is blocked, and the oil port LP communicates with the oil port GP on the hydraulic control oil circuit block 21 of the upper plug.

[0075] As Figure 3 shown in the figure, the hydraulic control oil circuit block 21 of the upper plug is also provided with a second one-way valve 36, a third one-way valve 37, and a third relief valve 35 to ensure smoother operation when the upper plug runs rapidly. The second one-way valve 36 is provided with a working oil port SP communicating with the oil port A1 and a working oil port ST communicating with the fuel tank 1. The third one-way valve 37 is provided with a working oil port SP communicating with the oil port B1 and an oil port ST communicating with the fuel tank 1. The third relief valve 35 is provided with an oil inlet AP communicating with the oil port A1 and a return oil port AT communicating with the fuel tank 1.

[0076] As Figure 3As shown in the figure, the upper plug energy storage device 032 includes an upper plug energy storage oil circuit block 45, an upper plug accumulator 40, a fourth overflow valve 41, a second manual ball valve 42, a one-way plug 43, and a first electromagnetic ball valve 44. The upper plug energy storage oil circuit block 45 is provided with an oil port NA, an oil port NB, and an oil port NE. The oil port NA is connected to the oil port C1 of the upper plug hydraulic control oil circuit block 21. The oil port NB is connected to the fuel tank 1. The oil port NE is connected to the upper plug accumulator 40. The oil port NE is also communicated with the oil port NB through the second manual ball valve 42 and the fourth overflow valve 41. The second manual ball valve 42 and the fourth overflow valve 41 are arranged in parallel, and the second manual ball valve 42 is normally closed and needs to be opened only during maintenance to release the hydraulic oil in the upper plug accumulator 40.

[0077] As Figure 3 shown in the figure, the one-way plug 43 is provided with a working oil port JA, a working oil port JB, and a control oil port JX. The first electromagnetic ball valve 44 is provided with an oil inlet QP, a working oil port QA, and an oil return port QT. The working oil port JA of the one-way plug 43 and the oil inlet QP of the first electromagnetic ball valve 44 are respectively communicated with the oil port NE. The working oil port JB of the one-way plug 43 is communicated with the oil port NA on the upper plug energy storage oil circuit block 45. The working oil port QA of the first electromagnetic ball valve 44 is communicated with the control oil port JX of the one-way plug 43. The oil return port QT of the first electromagnetic ball valve 44 is communicated with the oil port NB on the upper plug energy storage oil circuit block 45.

[0078] As Figure 4 shown in the figure, the auxiliary hydraulic control oil circuit block 46 is provided with an oil port DP, an oil port DN, an oil port FD, an oil port BG, and pressure measurement ports M2 and M3. The upper plug auxiliary unit 0411 includes a large flow cut-off valve 47 and a fourth one-way valve 48. The large flow cut-off valve 47 is provided with a working oil port DA, a working oil port DB, a control oil port DX, a control oil port DZ, and an oil drain port DY. The oil port DP of the auxiliary hydraulic control oil circuit block 46 is communicated with the oil outlet of the low-pressure gear pump 18 and the pressure measurement port M2, and the oil port DP is connected with a fourth pressure sensor 50 for detecting its pressure. The fourth pressure sensor 50 is communicatively feedback-controlledly connected to the low-pressure servo motor 17. The oil port DN is communicated with the oil port BG and the pressure measurement port M3. A fifth one-way valve 49 and a damping joint 84 for connecting them are provided between the oil port BG and the oil port GB of the upper plug hydraulic control oil circuit block 21. The fifth one-way valve 49 is close to the oil port BG. The oil port FD is communicated with the oil port DF of the upper plug hydraulic control oil circuit block 21.

[0079] As Figure 4As shown, the working oil port DA and the control oil port DZ of the large flow cut-off valve 47 communicate with the oil port DP of the auxiliary hydraulic control oil block 46, and the working oil port DA and the oil port DP are connected through the fourth one-way valve 48; the working oil port DB, the control oil port DX of the large flow switching valve communicate with the oil port FD of the auxiliary hydraulic control oil block 46, and the oil drain port DY communicates with the fuel tank 1.

[0080] As Figure 4 or Figure 5 As shown, the auxiliary energy storage device 043 includes an auxiliary energy storage oil block 72, an auxiliary accumulator 67, a seventh overflow valve 71, a third manual ball valve 68, a second solenoid ball valve 69, and a fourth manual ball valve 70. The auxiliary energy storage oil block 72 is provided with an oil port NC, an oil port ND, and an oil port NF. The oil port NC of the auxiliary energy storage oil block 72 communicates with the oil port DN on the auxiliary hydraulic control oil block 46, the oil port ND is connected to the fuel tank 1, and a seventh overflow valve 71 is also connected between the oil port ND and the oil port NC; the auxiliary accumulator 67 is connected to the oil port NF, and a second solenoid ball valve 69 and a third manual ball valve 68 arranged in parallel are also connected between the oil port NF and the oil port ND. The third manual ball valve 68 is normally closed, and a fourth manual ball valve 70 is connected between the oil port NF and the oil port NC. The fourth manual ball valve 70 is normally open. When maintenance is required, the third manual ball valve 68 is opened to release the hydraulic oil in the auxiliary accumulator 67.

[0081] As Figure 5 As shown, the auxiliary hydraulic control oil block 46 is also provided with an oil port FT, an oil port A4, an oil port B4, and a pressure measurement port M5. The oil port FT and the fuel tank 1 are connected through an auxiliary oil return filter 83. The oil port A4 communicates with the rodless cavity of the locking pin cylinder 06 and the pressure measurement port M5. The pressure measurement port M5 detects the pressure of the locking pin cylinder 06. The oil port B4 communicates with the rod chamber of the locking pin cylinder 06.

[0082] As Figure 5 As shown, the locking pin control unit 0412 includes a sixth one-way valve 51, a first one-way throttle valve 52, a third one-way throttle valve 521, an electro-hydraulic reversing valve 53, and a first pressure reducing valve 54. The electro-hydraulic reversing valve 53 is provided with a first working oil port YA, a second working oil port YB, an oil inlet YP, and an oil return port YT. The first working oil port YA communicates with the oil port A4 of the auxiliary hydraulic control oil block 46 through the first one-way throttle valve 52 and the first pressure reducing valve 54. The second working oil port YB communicates with the oil port B4 of the auxiliary hydraulic control oil block 46 through the third one-way throttle valve 521. The oil inlet YP communicates with the oil port DN of the auxiliary hydraulic control oil block 46 through the sixth one-way valve 51. The oil return port YT communicates with the oil port FT of the auxiliary hydraulic control oil block 46.

[0083] As Figure 5As shown in the figure, the auxiliary hydraulic control oil circuit block 46 is also provided with an oil port A3, an oil port B3 and a pressure measuring port M7. The oil port A3 is communicated with the rodless cavity of the charging door cylinder 07 and the pressure measuring port M7. The pressure measuring port M7 detects the pressure of the charging door cylinder 07. The oil port B3 is communicated with the rod cavity of the charging door cylinder 07.

[0084] As Figure 5 shown in the figure, the charging door control unit 0413 includes a second one-way throttle valve 55, a fourth one-way throttle valve 551, a second pressure reducing valve 56, and a third electromagnetic reversing valve 57. The third electromagnetic reversing valve 57 is provided with an oil inlet RP, an oil return port RT, a first working oil port RA, and a second working oil port RB. The oil inlet RP is communicated with the oil port DN of the auxiliary hydraulic control oil circuit block 46 through the second pressure reducing valve 56. The oil return port RT is communicated with the oil port FT of the auxiliary hydraulic control oil circuit block 46. The first working oil port RA is communicated with the oil port A3 of the auxiliary hydraulic control oil circuit block 46 through the second one-way throttle valve 55. The second working oil port RB is communicated with the oil port B3 of the auxiliary hydraulic control oil circuit block 46 through the fourth one-way throttle valve 551.

[0085] As Figure 5 shown in the figure, the auxiliary hydraulic control oil circuit block 46 is also provided with an oil port A2, an oil port B2 and a pressure measuring port M9. The oil port A2 is communicated with the pressure measuring port M9. The discharge door cylinder 08 includes a first cylinder 081 and a second cylinder 082 with opposite piston rods, and a third cylinder 083 and a fourth cylinder 084 with opposite piston rods. The third cylinder 083 is located on one side of the first cylinder 081 and their piston rods are parallel to each other. The fourth cylinder 084 is located on one side of the second cylinder 082 and their piston rods are parallel to each other. The discharge door is driven to rotate and open or close by controlling the telescopic movement of the discharge door cylinder 08. Among them, the rodless cavity of the first cylinder 081 is PE, the rodless cavity of the second cylinder 082 is PC, the rodless cavity of the third cylinder 083 is PD, and the rodless cavity of the fourth cylinder 084 is PF. The oil port A2 on the auxiliary hydraulic control oil circuit block 46 is communicated with PC and PD, and the oil port B2 is communicated with PE and PF.

[0086] As Figure 5As shown, the discharge door control unit 0414 includes a fifth overflow valve 58, a sixth overflow valve 59, and an electro-hydraulic proportional direction valve 60. The electro-hydraulic proportional direction valve 60 is provided with an oil inlet PP, an oil return port PT, a first working oil port PA, and a second working oil port PB. The oil inlet PP is communicated with the oil port DN of the auxiliary hydraulic control oil circuit block 46, the oil return port PT is communicated with the oil port FT of the auxiliary hydraulic control oil circuit block 46, the first working oil port PA is communicated with the oil port A2 of the auxiliary hydraulic control oil circuit block 46, and the second working oil port PB is communicated with the oil port B2 of the auxiliary hydraulic control oil circuit block 46. A connection is made between the first working oil port PA and the oil return port PT through the sixth overflow valve 59, and a connection is made between the second working oil port PB and the oil return port PT through the fifth overflow valve 58. Safety protection for the discharge door cylinder 08 is achieved through the fifth overflow valve 58 and the sixth overflow valve 59.

[0087] As Figure 5 shown, the auxiliary hydraulic control oil circuit block 46 is also provided with a number of oil ports A5 and a number of pressure measurement ports M10 respectively corresponding to and communicated with the oil ports A5. Each rotor seal control unit 0415 includes a seventh one-way valve 61 and a third pressure reducing valve 62. The oil port DN on the auxiliary hydraulic control oil circuit block 46 is sequentially communicated with the third pressure reducing valve 62 through the seventh one-way valve 61 and its oil port A5. The oil port A5 is communicated with the rodless chambers of a number of rotor seal cylinders 09. The pressure measurement port M10 detects the pressure of the rotor seal cylinder 09. Whether the internal mixer is working or not, the rotor seal cylinder 09 presses the sealing mechanism. If the pressure detected by the pressure measurement port M10 is greater than the set upper limit or lower than the set lower limit, the internal mixer cannot work.

[0088] As Figure 5 shown, the auxiliary hydraulic control oil circuit block 46 is also provided with an oil port CA, an oil port CB, an oil port CC, and an oil port CD. The oil port CA is communicated with the oil port A4 and the pressure measurement port M5. The oil port CB is communicated with the oil port B4. The oil port CC is communicated with the oil port A2 and the pressure measurement port M9. The oil port CD is communicated with the oil port B2.

[0089] As Figure 5 shown, the manual emergency operation device 042 includes a manual pump 20, a fifth manual ball valve 63, an eighth one-way valve 64, a sixth manual ball valve 65, and a ninth one-way valve 66. The oil inlet of the manual pump 20 is connected to the fuel tank 1, and the oil outlet is respectively communicated with the oil port CB and the oil port CD on the auxiliary hydraulic control oil circuit block 46 through the eighth one-way valve 64 and the ninth one-way valve 66. The fifth manual ball valve 63 connects the oil port CA on the auxiliary hydraulic control oil circuit block 46 and the fuel tank 1. The sixth manual ball valve 65 connects the oil port CC on the auxiliary hydraulic control oil circuit block 46 and the fuel tank 1. When the lock pin control unit 0412 and the discharge door control unit 0414 fail, the manual emergency operation is enabled to control the lock pin cylinder 06 and the discharge door cylinder 08 to work.

[0090] As Figure 2As shown in the figure, the circulating cooling and filtering device 01 includes a motor 7, a hydraulic pump 8, a cooling filter 9, a cooler 10, a water filter 11, a first manual ball valve 12, a tenth one-way valve 13, a high-pressure throttle valve 16 and a low-pressure throttle valve 19. The hydraulic pump 8 is respectively connected to an oil tank 1, a motor 7, and a cooler 10. The cooler 10 is also respectively connected to a water filter 11, a high-pressure throttle valve 16 and a low-pressure throttle valve 19. The high-pressure throttle valve 16 and the low-pressure throttle valve 19 are respectively communicated with the oil inlets of a high-pressure servo motor 14 and a low-pressure servo motor 17. A tenth one-way valve 13, a first manual ball valve 12 and a cooling filter 9 are successively connected between the cooler 10 and the oil tank 1, and the cooling filter 9 is close to the oil tank 1.

[0091] As Figure 1 and Figure 5 shown in the figure, the present invention further includes an instrument panel 82, and the instrument panel 82 is provided with a first pressure gauge 74, a second pressure gauge 75, a third pressure gauge 76, a fourth pressure gauge 77, a fifth pressure gauge 78, a sixth pressure gauge 79, an electric contact pressure gauge 80, a pressure relay 73 and a spare pressure gauge 81. As Figure 4 and Figure 5 shown in the figure, the first pressure gauge 74, the second pressure gauge 75, the third pressure gauge 76, the fourth pressure gauge 77, the fifth pressure gauge 78, the sixth pressure gauge 79, the electric contact pressure gauge 80, the pressure relay 73 are connected to the pressure measurement ports M16, M20, M5, M7, M9, M2, M10, M3. M16, M20, M5, M7, M9, M2, M10, M3 respectively detect the pressures of a high-pressure gear pump 15, an upper plug cylinder 05, a locking pin cylinder 06, a feeding door cylinder 07, a discharging door cylinder 08, a low-pressure gear pump 18, and a rotor seal cylinder 09.

[0092] Working principle and usage method of the present invention:

[0093] The instructions of the electric control system of the present invention and the output signals of the energy-saving oil supply unit 02 and several pressure sensors are used for closed-loop control of the rotational speed changes of the high-pressure servo motor 14 and the low-pressure servo motor 17, so as to realize the changes of the hydraulic oil flow rate and pressure output by the high-pressure gear pump 15 and the low-pressure gear pump 18 during the operation of the internal mixer, thereby providing appropriate pressure and flow rate according to the actual requirements in each stage of the internal mixer working process, and improving the energy-saving effect of the hydraulic control system of the internal mixer.

[0094] The present invention can achieve controlling the rapid descent of the upper plug, the slow descent of the upper plug, rubber mixing, the floating of the upper plug, the slow ascent of the upper plug, the rapid ascent of the upper plug, the loosening or locking of the locking pin, the opening or closing of the feeding door, the fast opening, slow opening, fast closing, and slow closing of the discharging door. It can be manually and emergently controlled when the locking pin control unit 0412 and the discharging door control unit 0414 malfunction, and can also perform circulating cooling on the energy-saving oil supply unit 02. The following is a detailed description of the above working process. For convenience of description, the working oil ports, control oil ports, oil inlets, oil return ports, oil drain ports, etc. related to the above valves are all referred to as oil ports.

[0095] I. Rapid descent of the upper plug:

[0096] As Figure 4 shown, the electromagnet YV1 of the large-flow cut-off valve 47, the electromagnet YV2 of the upper plug descent control valve 23, the electromagnet YV3 of the second electromagnetic directional control valve 32, and the electromagnet YV4 of the first electromagnetic directional control valve 30 are energized. The oil port DA and the oil port DB of the large-flow cut-off valve 47 are connected, the oil port XA and the oil port XB of the upper plug descent control valve 23 are connected, the oil port LP and the oil port LB of the second electromagnetic directional control valve 32 are connected, the oil port MB and the oil port MA of the second hydraulic check valve 31 are connected, the oil port EP and the oil port EB of the first electromagnetic directional control valve 30 are connected, and the oil port KB and the oil port KA of the first hydraulic check valve 29 are connected.

[0097] As Figure 4 shown, the hydraulic oil of the fuel tank 1 is output by the high-pressure gear pump 15 and the low-pressure gear pump 18. The hydraulic oil of the high-pressure gear pump 15 is input into the upper plug descent control valve 23 through the oil port GP of the upper plug hydraulic control oil block 21 and the first check valve 28. The hydraulic oil of the low-pressure gear pump 18 passes through the oil port DP of the auxiliary hydraulic control oil block 46, the fourth check valve 48, the oil ports DA and DB of the large-flow cut-off valve 47, the oil port FD of the auxiliary hydraulic control oil block 46, and the oil port DF of the upper plug hydraulic control oil block 21 and is input into the upper plug descent control valve 23. The two-way hydraulic oil is fed into the rod chamber of the upper plug cylinder 05 from the oil ports XA and XB of the upper plug descent control valve 23 and the oil port B1 of the upper plug hydraulic control oil block 21.

[0098] As Figure 4 shown, the hydraulic oil in the rodless chamber of the upper plug cylinder 05 enters the fuel tank 1 through the oil port A1 of the upper plug hydraulic control oil block 21 and the first hydraulic check valve 29, and at the same time enters the fuel tank 1 through the down throttle valve 33, the second hydraulic check valve 31, and the back pressure valve 34. The piston rod of the upper plug cylinder 05 descends rapidly.

[0099] II. Slow descent of the upper plug:

[0100] As Figure 4As shown in the figure, the electromagnet YV2 of the upper plug descending control valve 23 and the electromagnet YV3 of the second electromagnetic reversing valve 32 are energized. The oil port XA and the oil port XB of the upper plug descending control valve 23 are connected, the oil port LP and the oil port LB of the second electromagnetic reversing valve 32 are connected, and the oil port MB and the oil port MA of the second hydraulic check valve 31 are connected.

[0101] As Figure 4 shown in the figure, the hydraulic oil output by the high-pressure gear pump 15 passes through the oil port GP of the upper plug hydraulic control oil block 21 and the first check valve 28, and then is sent to the rod chamber of the upper plug cylinder 05 through the oil port XA, the oil port XB of the upper plug descending control valve 23, and the oil port B1 of the upper plug hydraulic control oil block 21. The hydraulic oil in the rodless chamber of the upper plug cylinder 05 enters the fuel tank 1 through the oil port A1 of the upper plug hydraulic control oil block 21, the descending throttle valve 33, the second hydraulic check valve 31, and the back pressure valve 34, and the piston rod of the upper plug cylinder 05 descends slowly.

[0102] III. Rubber mixing:

[0103] As Figure 4 shown in the figure, the measured pressure signals of the second pressure sensor 38 and the third pressure sensor 39 are converted into differential pressure signals and are closed-loop controlled with the command signal of the electronic control system to control the high-pressure servo motor 14, ensuring that the differential pressure between the oil port A1 and the oil port B1 of the upper plug hydraulic control oil block 21 is constant.

[0104] As Figure 4 shown in the figure, the electromagnet YV2 of the upper plug descending control valve 23, the electromagnet YV3 of the second electromagnetic reversing valve 32, and the electromagnet YV7 of the first electromagnetic ball valve 44 are energized. The oil port XA and the oil port XB of the upper plug descending control valve 23 are connected, the oil port LP and the oil port LB of the second electromagnetic reversing valve 32 are connected, the oil port MB and the oil port MA of the second hydraulic check valve 31 are connected, and the oil passage from the oil port JA to the oil port JB of the one-way plug-in 43 is opened.

[0105] As Figure 4 shown in the figure, when pressure supply is required, the hydraulic oil in the upper plug accumulator 40 passes through the oil port JA, the oil port JB of the one-way plug-in 43, the oil port NA of the upper plug accumulator oil block 45, the oil port C1, and the oil port B1 of the upper plug hydraulic control oil block 21 and is sent to the rod chamber of the upper plug cylinder 05 to provide pressure for it. When the piston rod of the upper plug cylinder 05 is lifted by an external force, the hydraulic oil in the rod chamber of the upper plug cylinder 05 enters the upper plug accumulator 40 in the reverse direction to realize energy recovery, and the hydraulic oil in the fuel tank 1 is replenished into the rodless chamber of the upper plug cylinder 05 through the second check valve 36.

[0106] IV. Floating of the upper plug:

[0107] As Figure 4As shown, the electromagnet YV4 of the first electromagnetic directional valve 30 and the electromagnet YV6 of the electro-controlled safety valve 24 are energized. The oil port EP of the first electromagnetic directional valve 30 is communicated with the oil port EB, the oil port KB of the first pilot-operated check valve 29 is communicated with the oil port KA, and the oil port HA of the electro-controlled safety valve 24 is communicated with the oil port HB.

[0108] As Figure 4 shown, when the piston rod of the upper plug cylinder 05 is lifted passively, the hydraulic oil in the rod chamber of the upper plug cylinder 05 is sent back to the oil tank 1 through the oil port B1 of the upper plug hydraulic control oil circuit block 21, the oil port HA and the oil port HB of the electro-controlled safety valve 24, while the hydraulic oil in the oil tank 1 is supplemented into the rodless chamber of the upper plug cylinder 05 through the second check valve 36. The rodless chamber of the upper plug cylinder 05 is communicated with the oil tank 1 through the first pilot-operated check valve 29. When the piston rod of the upper plug cylinder 05 descends passively, the hydraulic oil in the rodless chamber of the cylinder returns to the oil tank 1 through the oil port KB and the oil port KA of the first pilot-operated check valve 29, and the hydraulic oil in the oil tank 1 is supplemented into the rod chamber of the upper plug cylinder 05 through the third check valve 37.

[0109] V. Slow ascent of the upper plug:

[0110] As Figure 4 shown, the electromagnet YV5 of the upper plug rising control valve 22 and the electromagnet YV6 of the electro-controlled safety valve 24 are energized. The oil port SA of the upper plug rising control valve 22 is communicated with the oil port SB, and the oil port HA of the electro-controlled safety valve 24 is communicated with the oil port HB.

[0111] As Figure 4 shown, the hydraulic oil of the oil tank 1 is output through the high-pressure gear pump 15, and after passing through the oil port GP on the upper plug hydraulic control oil circuit block 21 and the first check valve 28, it is sent to the rodless chamber of the upper plug cylinder 05 through the oil port SA, the oil port SB of the upper plug rising control valve 22, and the oil port A1 of the upper plug hydraulic control oil circuit block 21. The hydraulic oil in the rod chamber of the upper plug cylinder 05 is sent back to the oil tank 1 through the oil port B1 of the plug hydraulic control oil circuit block, the oil port HA and the oil port HB of the electro-controlled safety valve 24, realizing the slow rise of the piston rod of the upper plug cylinder 05.

[0112] VI. Rapid ascent of the upper plug:

[0113] As Figure 4 shown, the high-pressure pump unit 021 and the low-pressure pump unit 022 operate at high speed and low pressure, and the electromagnets YV1 of the large-flow cut-off valve 47, YV2 of the upper plug descending control valve 23, and YV5 of the upper plug rising control valve 22 are energized. The oil port DA of the large-flow cut-off valve 47 is communicated with the oil port DB, the oil port XA of the upper plug descending control valve 23 is communicated with the oil port XB, and the oil port SA of the upper plug rising control valve 22 is communicated with the oil port SB.

[0114] As Figure 4As shown, the hydraulic oil in the fuel tank 1 is output by the high-pressure gear pump 15 and the low-pressure gear pump 18. The hydraulic oil of the high-pressure gear pump 15 is input into the upper plug rising control valve 22 through the oil port GP of the upper plug hydraulic control oil circuit block 21 and the first one-way valve 28. The hydraulic oil of the low-pressure gear pump 18 passes through the oil port DP of the auxiliary hydraulic control oil circuit block 46, the fourth one-way valve 48, the oil ports DA and DB of the large-flow cut-off valve 47, the oil port FD of the auxiliary hydraulic control oil circuit block 46, and the oil port DF of the upper plug hydraulic control oil circuit block 21 and is input into the upper plug rising control valve 22. The two-way hydraulic oil is fed into the rodless cavity of the upper plug cylinder 05 from the oil ports SA and SB of the upper plug rising control valve 22 and the oil port A1 of the upper plug hydraulic control oil circuit block 21.

[0115] As Figure 4 As shown, the hydraulic oil in the rod cavity of the upper plug cylinder 05 passes through the oil port B1 of the upper plug hydraulic control oil circuit block 21, the oil ports XB and XA of the upper plug descending control valve 23 and then is sent to the oil port SA of the upper plug rising control valve 22, and is re-sent back to the rodless cavity of the upper plug cylinder 05 to form a differential circuit, improving the operating speed of the piston rod of the upper plug cylinder 05 and enabling the upper plug to rise rapidly.

[0116] VII. Release and locking of the locking pin:

[0117] As Figure 5 As shown, the electromagnet YV13 of the electro-hydraulic reversing valve 53 is energized. The oil port YP of the electro-hydraulic reversing valve 53 is communicated with the oil port YB, and the oil port YA is communicated with the oil port YT. The hydraulic oil of the auxiliary accumulator 67 sequentially passes through the oil port NF of the auxiliary accumulator oil circuit block 72, the fourth manual ball valve 70, the oil port NC of the auxiliary accumulator oil circuit block 72, the oil port DN of the auxiliary hydraulic control oil circuit block 46, the sixth one-way valve 51, the oil ports YP and YB of the electro-hydraulic reversing valve 53, the third one-way throttle valve 521, and the oil port B4 of the auxiliary hydraulic control oil circuit block 46 and enters the rod cavity of the locking pin cylinder 06. The hydraulic oil in the rodless cavity of the locking pin cylinder 06 sequentially passes through the oil port A4 of the auxiliary hydraulic control oil circuit block 46, the first pressure reducing valve 54, the first one-way throttle valve 52, the oil ports YA and YT of the electro-hydraulic reversing valve 53, the oil port FT of the auxiliary hydraulic control oil circuit block 46, and the auxiliary oil return filter 83 and is sent back to the fuel tank 1. The piston rod of the locking pin cylinder 06 retracts and the locking pin is released.

[0118] As Figure 5As shown, the electromagnet YV14 of the electro-hydraulic directional valve 53 is energized. The oil port YP of the electro-hydraulic directional valve 53 is connected to the oil port YA, and the oil port YB is connected to the oil port YT. The hydraulic oil of the auxiliary accumulator 67 sequentially passes through the oil port NF of the auxiliary accumulator oil circuit block 72, the fourth manual ball valve 70, the oil port NC of the auxiliary accumulator oil circuit block 72, the oil port DN of the auxiliary hydraulic control oil circuit block 46, the sixth one-way valve 51, the oil port YP of the electro-hydraulic directional valve 53, the oil port YA, the first one-way throttle valve 52, the first pressure reducing valve 54, and enters the rodless cavity of the locking pin cylinder 06 through the oil port A4 of the auxiliary hydraulic control oil circuit block 46. The hydraulic oil in the rod cavity of the locking pin cylinder 06 sequentially passes through the oil port B4 of the auxiliary hydraulic control oil circuit block 46, the third one-way throttle valve 521, the oil port YB of the electro-hydraulic directional valve 53, the oil port YT, the oil port FT of the auxiliary hydraulic control oil circuit block 46, and the auxiliary return oil filter 83 and is sent back to the oil tank 1. The piston rod of the locking pin cylinder 06 extends, and the locking pin is locked.

[0119] VIII. Opening and closing of the feeding door:

[0120] As Figure 5 shown, the electromagnet YV11 of the third electromagnetic directional valve 57 is energized. The oil port RP of the third electromagnetic directional valve 57 is connected to the oil port RB, and the oil port RA is connected to the oil port RT. The hydraulic oil of the auxiliary accumulator 67 sequentially passes through the oil port NF of the auxiliary accumulator oil circuit block 72, the fourth manual ball valve 70, the oil port NC of the auxiliary accumulator oil circuit block 72, the oil port DN of the auxiliary hydraulic control oil circuit block 46, the second pressure reducing valve 56, the oil port RP of the third electromagnetic directional valve 57, the oil port RB, the fourth one-way throttle valve 551, and enters the rod cavity of the charging door cylinder 07 through the oil port B3 of the auxiliary hydraulic control oil circuit block 46. The hydraulic oil in the rodless cavity of the charging door cylinder 07 sequentially passes through the oil port A3 of the auxiliary hydraulic control oil circuit block 46, the second one-way throttle valve 55, the oil port RA of the third electromagnetic directional valve 57, the oil port RT, the oil port FT of the auxiliary hydraulic control oil circuit block 46, and the auxiliary return oil filter 83 and is sent back to the oil tank 1. The piston rod of the charging door cylinder 07 retracts, and the charging door opens.

[0121] As Figure 5As shown in the figure, the electromagnet YV12 of the third electromagnetic directional valve 57 is energized. The oil port RP of the third electromagnetic directional valve 57 is communicated with the oil port RA, and the oil port RB is communicated with the oil port RT. The hydraulic oil of the auxiliary accumulator 67 sequentially passes through the oil port NF of the auxiliary accumulator oil circuit block 72, the fourth manual ball valve 70, the oil port NC of the auxiliary accumulator oil circuit block 72, the oil port DN of the auxiliary hydraulic control oil circuit block 46, the second pressure reducing valve 56, the oil port RP of the electro-hydraulic directional valve 53, the oil port RA, the second one-way throttle valve 55, and the oil port A3 of the auxiliary hydraulic control oil circuit block 46 to enter the rodless cavity of the charging door cylinder 07. The hydraulic oil in the rod chamber of the charging door cylinder 07 sequentially passes through the oil port B3 of the auxiliary hydraulic control oil circuit block 46, the fourth one-way throttle valve 551, the oil port RB of the third electromagnetic directional valve 57, the oil port RT, the oil port FT of the auxiliary hydraulic control oil circuit block 46, and the auxiliary return oil filter 83 and is sent back to the fuel tank 1. The piston rod of the charging door cylinder 07 extends, and the charging door closes.

[0122] IX. Opening and closing of the discharging door:

[0123] As Figure 5 shown in the figure, the electro-hydraulic proportional directional valve 60 receives different command signals to achieve the quick opening, slow opening, quick closing, and slow closing of the discharge door. By inputting a voltage signal of -10V to +10V or a current signal of 4mA to 20mA to the electro-hydraulic proportional directional valve 60, the working state of the electro-hydraulic proportional directional valve 60 is changed. When a voltage signal of 0V or a current signal of 12mA is input, the oil ports PP, PT, PA, and PB of the electro-hydraulic proportional directional valve 60 are not communicated with each other.

[0124] As Figure 5 shown in the figure, when a voltage signal of -10V to 0V or a current signal of 4mA to 12mA is input, the oil ports PP and PB of the electro-hydraulic proportional directional valve 60 are communicated, and the oil ports PA and PT are communicated. The hydraulic oil of the auxiliary accumulator 67 sequentially passes through the oil port NF of the auxiliary accumulator oil circuit block 72, the fourth manual ball valve 70, the oil port NC of the auxiliary accumulator oil circuit block 72, the oil port DN of the auxiliary hydraulic control oil circuit block 46, the oil ports PP and PB of the electro-hydraulic proportional directional valve 60, and the oil port B2 of the auxiliary hydraulic control oil circuit block 46 to enter the rodless cavities PE and PF of the discharge door cylinder 08. The hydraulic oil in the rodless cavities PC and PD of the discharge door cylinder 08 sequentially passes through the oil port A2 of the auxiliary hydraulic control oil circuit block 46, the oil ports PA and PT of the electro-hydraulic proportional directional valve 60, the oil port FT of the auxiliary hydraulic control oil circuit block 46, and the auxiliary return oil filter 83 and is sent back to the fuel tank 1. The discharge door opens.

[0125] As Figure 5As shown, when a voltage signal of 0V to +10V or a current signal of 12mA to 20mA is input, the oil ports PP and PA of the electro-hydraulic proportional direction valve 60 are connected, and the oil ports PB and PT are connected. The hydraulic oil of the auxiliary accumulator 67 sequentially passes through the oil port NF of the auxiliary accumulator oil circuit block 72, the fourth manual ball valve 70, the oil port NC of the auxiliary accumulator oil circuit block 72, the oil port DN of the auxiliary hydraulic control oil circuit block 46, the oil ports PP and PA of the electro-hydraulic proportional direction valve 60, and the oil port A2 of the auxiliary hydraulic control oil circuit block 46 to enter the rodless chambers PC and PD of the discharge door cylinder 08. The hydraulic oil in the rodless chambers PE and PF of the discharge door cylinder 08 sequentially passes through the oil port B2 of the auxiliary hydraulic control oil circuit block 46, the oil ports PB and PT of the electro-hydraulic proportional direction valve 60, the oil port FT of the auxiliary hydraulic control oil circuit block 46, and the auxiliary return oil filter 83 and is returned to the oil tank 1, and the discharge door is closed.

[0126] Changing the magnitude of the input signal can change the flow rate through the electro-hydraulic proportional direction valve 60, realizing the quick opening, slow opening, quick closing, and slow closing of the discharge door.

[0127] Among them, as Figure 4 shown, when the pin control unit 0412, the charging door control unit 0413, the discharge door control unit 0414, and the rotor seal control unit 0415 are working, the flow rate and pressure are provided by the auxiliary accumulator 67. When the oil pressure of the auxiliary accumulator 67 drops to the lowest pressure set by the pressure relay 73, the low-pressure pump unit 022 operates to replenish the pressure of the auxiliary accumulator 67. The hydraulic oil in the oil tank 1 passes through the low-pressure gear pump 18, the oil port DP on the auxiliary hydraulic control oil circuit block 46, the fourth one-way valve 48, the oil port DN on the auxiliary hydraulic control oil circuit block 46, the oil port NC on the auxiliary accumulator oil circuit block 72, and the oil port NF and is sent into the auxiliary accumulator 67.

[0128] X. Manual emergency control:

[0129] As Figure 5 shown, when a fault occurs in the pin control unit 0412 during the operation of the internal mixer, open the fifth manual ball valve 63 and operate the manual pump 20. The hydraulic oil output by the manual pump 20 passes through the eighth one-way valve 64, the oil ports CB and B4 of the auxiliary hydraulic control oil circuit block 46 and is sent to the rodless chamber of the pin cylinder 06. The hydraulic oil in the rodless chamber of the pin cylinder 06 passes through the oil ports A4 and CA of the auxiliary hydraulic control oil circuit block 46 and the fifth manual ball valve 63 and is returned to the oil tank 1, and the pin is released.

[0130] As Figure 5As shown, when a fault occurs in the discharge door control unit 0414 during the operation of the internal mixer, open the sixth manual ball valve 65 and operate the manual pump 20. The hydraulic oil output by the manual pump 20 passes through the ninth one-way valve 66, the oil ports CD and B2 of the auxiliary hydraulic control oil block 46, and is sent to the rodless chambers PE and PF of the discharge door cylinder 08. The hydraulic oil in the rodless chambers PD and PC of the discharge door cylinder 08 is sent back to the oil tank 1 through the oil ports A2, CC of the auxiliary hydraulic control oil block 46 and the sixth manual ball valve 65, and the discharge door opens.

[0131] XI. Circulating cooling and filtration:

[0132] As Figure 2 shown, the motor 7 drives the hydraulic pump 8 to send the oil fluid in the oil tank 1 into the cooler 10 for cooling in cooperation with the water filter 11. The cooled hydraulic oil enters the high-pressure servo motor 14 and the low-pressure servo motor 17 respectively through the high-pressure throttle valve 16 and the low-pressure throttle valve 19 for cooling. The excess coolant passes through the tenth one-way valve 13 and the cooling filter 9 and is sent back to the oil tank 1.

[0133] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in related fields. And any changes and variations made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. An energy-saving hydraulic system for a mixer that controls pressure and flow with a servo motor, characterized in that: It includes a fuel tank (1), an energy-saving fuel supply unit (02) connected to the fuel tank (1) to form a closed-loop circuit, an upper plug hydraulic control circuit (03), an auxiliary hydraulic control circuit (04), and a circulating cooling and filtering device (01); The energy-saving fuel supply unit (02) includes a high-pressure pump unit (021) and a low-pressure pump unit (022). The upper plug hydraulic control circuit (03) includes an upper plug hydraulic control valve group (031) and an upper plug energy storage device (032). The high-pressure pump unit (021) and the upper plug hydraulic control circuit (03) cooperate to control the slow lifting and lowering of the upper plug cylinder (05). The upper plug energy storage device (032) replenishes pressure and recovers energy for the upper plug cylinder (05) during rubber mixing; The auxiliary hydraulic control circuit (04) includes an auxiliary hydraulic control valve group (041), an auxiliary energy storage device (043), an auxiliary oil return filter (83), and a manual emergency operation device (042). The auxiliary hydraulic control valve group (041) includes an auxiliary hydraulic control oil circuit block (46), an upper plug auxiliary unit (0411), a locking pin control unit (0412), a charging door control unit (0413), a discharging door control unit (0414), and a plurality of rotor seal control units (0415) arranged in parallel; The high-pressure pump unit (021) cooperates with the upper plug hydraulic control circuit (03), and the low-pressure pump unit (022) cooperates with the upper plug auxiliary unit (0411) to jointly control the rapid lifting and lowering of the upper plug cylinder (05). The auxiliary energy storage device (043) provides flow and pressure for the locking pin control unit (0412), the charging door control unit (0413), the discharging door control unit (0414), and a plurality of rotor seal control units (0415) when they are working. The low-pressure pump unit (022) replenishes hydraulic oil for the auxiliary energy storage device (043) when the hydraulic oil in it is insufficient. The circulating cooling and filtering device (01) cools down the high-pressure pump unit (021) and the low-pressure pump unit (022) of the energy-saving fuel supply unit (02); The locking pin control unit (0412) controls the locking pin cylinder (06) to work to lock or unlock the locking pin. The charging door control unit (0413) controls the charging door cylinder (07) to work to open or close the charging door. The discharging door control unit (0414) controls the discharging door cylinder (08) to open or close the discharging door. The rotor seal control unit (0415) makes the rotor seal cylinder (09) work to always perform sealing; The auxiliary oil return filter (83) filters the hydraulic oil sent back to the fuel tank (1) by the auxiliary hydraulic control circuit (04). The manual emergency operation device (042) performs manual control after the locking pin control unit (0412) and the discharging door control unit (0414) fail; The high-pressure pump unit (021) includes a high-pressure servo motor (14) and a high-pressure gear pump (15). The high-pressure servo motor (14) drives the high-pressure gear pump (15) to work. The inlet of the high-pressure gear pump (15) is connected to the fuel tank (1), and the outlet is connected to the upper plug hydraulic control valve group (031). The upper plug hydraulic control valve group (031) includes an upper plug hydraulic control oil circuit block (21), an upper plug rising control valve (22), an upper plug descending control valve (23), an electronic control safety valve (24), a second overflow valve (26), a first one-way valve (28), a quick descending oil return unit (0311) and a slow descending oil return unit (0312).

2. The energy-saving internal mixer hydraulic system for controlling pressure and flow rate of a servo motor according to claim 1, characterized in that: The upper plug hydraulic control oil circuit block (21) is provided with oil ports GP, GB, DF, A1, B1, C1 and pressure measuring ports M16, M20. The oil port A1 is communicated with the rodless cavity of the upper plug cylinder (05), the oil port B1 is communicated with the rod cavity of the upper plug cylinder (05), the oil port GP is communicated with the pressure measuring port M16 and the oil port GB, and the oil port B1 is communicated with the pressure measuring port M20 and the oil port C1; the oil port GP is communicated with the outlet of the high-pressure gear pump (15), the pressure measuring port M16 detects the output pressure of the high-pressure gear pump (15), and the pressure measuring port M20 detects the pressure of the upper plug cylinder (05). The inlet of the second overflow valve (26) is communicated with the oil port GP, and the outlet is communicated with the fuel tank (1); the upper plug hydraulic control oil circuit block (21) is also provided with a first pressure sensor (27), a second pressure sensor (38) and a third pressure sensor (39) for respectively detecting the pressures of the oil ports GP, A1, B1, and the first pressure sensor (27) is communicatively feedback controlled and connected to the high-pressure servo motor (14). The upper plug rising control valve (22) is provided with a working oil port SA, a working oil port SB, a control oil port SX, a control oil port SZ, and a drain oil port SY. The working oil port SA is communicated with the control oil port SZ, the oil port GP, and the oil port DF on the upper plug hydraulic control oil circuit block (21), and a first one-way valve (28) is connected between the working oil port SA and the oil port GP; the working oil port SB is communicated with the oil port A1 and the control oil port SX, and the drain oil port SY is communicated with the fuel tank (1). The upper plug descending control valve (23) is provided with a working oil port XA, a working oil port XB, a control oil port XX, a control oil port XZ, and a drain oil port XY. The working oil port XA is communicated with the control oil port XZ, the working oil port SA of the upper plug rising control valve (22), the oil port GP, and the oil port DF on the upper plug hydraulic control oil circuit block (21), and the first one-way valve (28) is connected between the oil port GP and the working oil port XA; the working oil port XB is communicated with the control oil port XX and the oil port B1 on the upper plug hydraulic control oil circuit block (21), and the drain oil port XY is communicated with the fuel tank (1). The electro-control safety valve (24) is provided with a working oil port HA, a working oil port HB, a control oil port HX, and an oil drain port HY. The working oil port HA communicates with the working oil port XB of the upper plug descending control valve (23). The working oil port HB communicates with the oil drain port HY and the oil tank (1). A first overflow valve (25) is provided between the control oil port HX and the oil port GP on the upper plug hydraulic control oil block (21). The rapid descending oil return unit (0311) includes a first pilot-operated check valve (29) and a first electromagnetic directional valve (30). The first pilot-operated check valve (29) is provided with a working oil port KA, a working oil port KB, a control oil port KX, and an oil drain port KY. The first electromagnetic directional valve (30) is provided with an oil inlet EP, a working oil port EA, a working oil port EB, and an oil return port ET. The working oil port KA of the first pilot-operated check valve (29) communicates with the oil tank (1). The working oil port KB communicates with the oil port A1 on the upper plug hydraulic control oil block (21). The control oil port KX communicates with the working oil port EB of the first electromagnetic directional valve (30). The oil drain port KY communicates with the oil return port ET of the first electromagnetic directional valve (30) and also communicates with the oil tank (1). The working oil port EA of the first electromagnetic directional valve (30) is blocked, and the oil inlet EP communicates with the oil port GP on the upper plug hydraulic control oil block (21). The slow descending oil return unit (0312) includes a second pilot-operated check valve (31), a second electromagnetic directional valve (32), a descending throttle valve (33), and a back pressure valve (34). The second pilot-operated check valve (31) is provided with a working oil port MA, a working oil port MB, a control oil port MX, and an oil drain port MY. The second electromagnetic directional valve (32) is provided with an oil inlet LP, a working oil port LA, a working oil port LB, and an oil return port LT. The working oil port MA of the second pilot-operated check valve (31) communicates with the oil tank (1) through the back pressure valve (34). The working oil port MB communicates with the oil port A1 on the upper plug hydraulic control oil block (21) through the descending throttle valve (33). The control oil port MX communicates with the working oil port LB of the second electromagnetic directional valve (32). The oil drain port MY communicates with the oil return port LT of the second electromagnetic directional valve (32) and also communicates with the oil tank (1). The working oil port LA of the second electromagnetic directional valve (32) is blocked, and the oil port LP communicates with the oil port GP on the upper plug hydraulic control oil block (21). The upper plug hydraulic control oil block (21) is further provided with a second check valve (36), a third check valve (37), and a third overflow valve (35). The second check valve (36) is provided with a working oil port SP communicating with the oil port A1 and a working oil port ST communicating with the oil tank (1). The third check valve (37) is provided with a working oil port SP communicating with the oil port B1 and an oil port ST communicating with the oil tank (1). The third overflow valve (35) is provided with an oil inlet AP communicating with the oil port A1 and an oil return port AT communicating with the oil tank (1).

3. An energy-saving internal mixer hydraulic system for controlling pressure and flow rate of a servo motor according to claim 2, characterized in that: The upper plug energy storage device (032) includes an upper plug energy storage oil circuit block (45), an upper plug accumulator (40), a fourth overflow valve (41), a second manual ball valve (42), a one-way plug-in (43), and a first electromagnetic ball valve (44); The upper plug energy storage oil circuit block (45) is provided with an oil port NA, an oil port NB, and an oil port NE. The oil port NA is connected to the oil port C1 of the upper plug hydraulic control oil circuit block (21). The oil port NB is connected to the fuel tank (1). The oil port NE is connected to the upper plug accumulator (40). The oil port NE is also communicated with the oil port NB through the second manual ball valve (42) and the fourth overflow valve (41). The second manual ball valve (42) and the fourth overflow valve (41) are arranged in parallel, and the second manual ball valve (42) is in a normally closed state; The one-way plug-in (43) is provided with a working oil port JA, a working oil port JB, and a control oil port JX. The first electromagnetic ball valve (44) is provided with an oil inlet QP, a working oil port QA, and an oil return port QT. The working oil port JA of the one-way plug-in (43) and the oil inlet QP of the first electromagnetic ball valve (44) are respectively communicated with the oil port NE. The working oil port JB of the one-way plug-in (43) is communicated with the oil port NA on the upper plug energy storage oil circuit block (45). The working oil port QA of the first electromagnetic ball valve (44) is communicated with the control oil port JX of the one-way plug-in (43). The oil return port QT of the first electromagnetic ball valve (44) is communicated with the oil port NB on the upper plug energy storage oil circuit block (45).

4. An energy-saving internal mixer hydraulic system for controlling pressure and flow rate of a servo motor according to claim 2, characterized in that: The low-pressure pump unit (022) includes a low-pressure servo motor (17) and a low-pressure gear pump (18). The low-pressure servo motor (17) drives the low-pressure gear pump (18) to work. The oil inlet of the low-pressure gear pump (18) is communicated with the fuel tank (1), and the oil outlet is connected to the auxiliary hydraulic control valve group (041); The auxiliary hydraulic control oil circuit block (46) is provided with an oil port DP, an oil port DN, an oil port FD, an oil port BG, and pressure measurement ports M2 and M3. The upper plug auxiliary unit (0411) includes a large-flow cut-off valve (47) and a fourth one-way valve (48). The large-flow cut-off valve (47) is provided with a working oil port DA, a working oil port DB, a control oil port DX, a control oil port DZ, and an oil drain port DY; The oil port DP of the auxiliary hydraulic control oil circuit block (46) is communicated with the pressure measurement port M2 and the oil outlet of the low-pressure gear pump (18), and the oil port DP is connected with a fourth pressure sensor (50) for detecting its pressure. The fourth pressure sensor (50) is connected to the low-pressure servo motor (17) for communication feedback control. The oil port DN is communicated with the oil port BG and the pressure measurement port M3. There is a fifth one-way valve (49) and a damping joint (84) for connecting the oil port BG and the oil port GB of the upper plug hydraulic control oil circuit block (21). The fifth one-way valve (49) is close to the oil port BG. The oil port FD is communicated with the oil port DF of the upper plug hydraulic control oil circuit block (21); The working oil port DA and the control oil port DZ of the large-flow cut-off valve (47) are communicated with the oil port DP of the auxiliary hydraulic control oil block (46), and the working oil port DA and the oil port DP are communicated through a fourth one-way valve (48); the working oil port DB and the control oil port DX of the large-flow cut-off valve (47) are communicated with the oil port FD of the auxiliary hydraulic control oil block (46), and the oil drain port DY is communicated with the fuel tank (1).

5. An energy-saving internal mixer hydraulic system for controlling pressure and flow rate of a servo motor, characterized in that: The auxiliary energy storage device (043) includes an auxiliary energy storage oil block (72), an auxiliary accumulator (67), a seventh overflow valve (71), a third manual ball valve (68), a second electromagnetic ball valve (69), and a fourth manual ball valve (70). The auxiliary energy storage oil block (72) is provided with an oil port NC, an oil port ND, and an oil port NF; The oil port NC of the auxiliary energy storage oil block (72) is communicated with the oil port DN on the auxiliary hydraulic control oil block (46), the oil port ND is connected to the fuel tank (1), and a seventh overflow valve (71) is also connected between the oil port ND and the oil port NC; the auxiliary accumulator (67) is connected to the oil port NF, and a second electromagnetic ball valve (69) and a third manual ball valve (68) arranged in parallel are also connected between the oil port NF and the oil port ND. The third manual ball valve (68) is in a normally closed state; a fourth manual ball valve (70) is connected between the oil port NF and the oil port NC, and the fourth manual ball valve (70) is in a normally open state; The auxiliary hydraulic control oil block (46) is also provided with an oil port FT, an oil port A4, an oil port B4, and a pressure measurement port M5. The oil port FT and the fuel tank (1) are communicated through an auxiliary return oil filter (83). The oil port A4 is communicated with the rodless cavity of the locking pin cylinder (06) and the pressure measurement port M5. The pressure measurement port M5 detects the pressure of the locking pin cylinder (06). The oil port B4 is communicated with the rod chamber of the locking pin cylinder (06); The locking pin control unit (0412) includes a sixth one-way valve (51), a first one-way throttle valve (52), a third one-way throttle valve (521), an electro-hydraulic reversing valve (53), and a first pressure reducing valve (54). The electro-hydraulic reversing valve (53) is provided with a first working oil port YA, a second working oil port YB, an oil inlet YP, and an oil return port YT. The first working oil port YA is communicated with the oil port A4 of the auxiliary hydraulic control oil block (46) through the first one-way throttle valve (52) and the first pressure reducing valve (54). The second working oil port YB is communicated with the oil port B4 of the auxiliary hydraulic control oil block (46) through the third one-way throttle valve (521). The oil inlet YP is communicated with the oil port DN of the auxiliary hydraulic control oil block (46) through the sixth one-way valve (51). The oil return port YT is communicated with the oil port FT of the auxiliary hydraulic control oil block (46).

6. An energy-saving internal mixer hydraulic system for controlling pressure and flow by a servo motor, characterized in that: The auxiliary hydraulic control oil block (46) is also provided with an oil port A3, an oil port B3, and a pressure measurement port M7. The oil port A3 is communicated with the rodless cavity of the charging door cylinder (07) and the pressure measurement port M7. The pressure measurement port M7 detects the pressure of the charging door cylinder (07). The oil port B3 is communicated with the rod chamber of the charging door cylinder (07); The feeding door control unit (0413) includes a second one-way throttle valve (55), a fourth one-way throttle valve (551), a second pressure reducing valve (56), and a third electromagnetic directional valve (57). The third electromagnetic directional valve (57) is provided with an oil inlet RP, an oil return port RT, a first working oil port RA, and a second working oil port RB. The oil inlet RP is communicated with the oil port DN of the auxiliary hydraulic control oil block (46) through the second pressure reducing valve (56). The oil return port RT is communicated with the oil port FT of the auxiliary hydraulic control oil block (46). The first working oil port RA is communicated with the oil port A3 of the auxiliary hydraulic control oil block (46) through the second one-way throttle valve (55). The second working oil port RB is communicated with the oil port B3 of the auxiliary hydraulic control oil block (46) through the fourth one-way throttle valve (551).

7. An energy-saving internal mixer hydraulic system for servo motor to control pressure and flow rate, characterized in that: The auxiliary hydraulic control oil block (46) is further provided with an oil port A2, an oil port B2, and a pressure measuring port M9. The oil port A2 is communicated with the pressure measuring port M9; The discharge door oil cylinder (08) includes a first oil cylinder (081) and a second oil cylinder (082) with opposite piston rods, and a third oil cylinder (083) and a fourth oil cylinder (084) with opposite piston rods. The third oil cylinder (083) is located on one side of the first oil cylinder (081) and their piston rods are parallel to each other. The fourth oil cylinder (084) is located on one side of the second oil cylinder (082) and their piston rods are parallel to each other. The discharge door oil cylinder (08) expands and contracts to drive the discharge door to rotate and open or close. The rodless cavity of the first oil cylinder (081) is PE, the rodless cavity of the second oil cylinder (082) is PC, the rodless cavity of the third oil cylinder (083) is PD, and the rodless cavity of the fourth oil cylinder (084) is PF. The oil port A2 on the auxiliary hydraulic control oil block (46) is communicated with PC and PD, and the oil port B2 is communicated with PE and PF; The discharge door control unit (0414) includes a fifth overflow valve (58), a sixth overflow valve (59), and an electro-hydraulic proportional direction valve (60). The electro-hydraulic proportional direction valve (60) is provided with an oil inlet PP, an oil return port PT, a first working oil port PA, and a second working oil port PB. The oil inlet PP is communicated with the oil port DN of the auxiliary hydraulic control oil block (46). The oil return port PT is communicated with the oil port FT of the auxiliary hydraulic control oil block (46). The first working oil port PA is communicated with the oil port A2 of the auxiliary hydraulic control oil block (46). The second working oil port PB is communicated with the oil port B2 of the auxiliary hydraulic control oil block (46). A connection is made between the first working oil port PA and the oil return port PT through the sixth overflow valve (59), and a connection is made between the second working oil port PB and the oil return port PT through the fifth overflow valve (58).

8. An energy-saving internal mixer hydraulic system for controlling pressure and flow by a servo motor, characterized in that: The auxiliary hydraulic control oil circuit block (46) is also provided with a number of oil ports A5 and a number of pressure measuring ports M10 respectively corresponding to and communicating with the oil ports A5. Each of the rotor seal control units (0415) includes a seventh one-way valve (61) and a third pressure reducing valve (62). The oil port DN on the auxiliary hydraulic control oil circuit block (46) is sequentially communicated with the third pressure reducing valve (62) and its oil port A5 through the seventh one-way valve (61). The oil port A5 is communicated with the rodless cavities of a number of rotor seal cylinders (09), and the pressure measuring port M10 detects the pressure of the rotor seal cylinders (09).

9. An energy-saving internal mixer hydraulic system for controlling pressure and flow by a servo motor, characterized in that: The auxiliary hydraulic control oil circuit block (46) is also provided with an oil port CA, an oil port CB, an oil port CC, and an oil port CD. The oil port CA is communicated with the oil port A4 and the pressure measuring port M5. The oil port CB is communicated with the oil port B4. The oil port CC is communicated with the oil port A2 and the pressure measuring port M9. The oil port CD is communicated with the oil port B2. The manual emergency operation device (042) includes a manual pump (20), a fifth manual ball valve (63), an eighth one-way valve (64), a sixth manual ball valve (65), and a ninth one-way valve (66). The inlet port of the manual pump (20) is connected to the fuel tank (1), and the outlet port is respectively communicated with the oil port CB and the oil port CD on the auxiliary hydraulic control oil circuit block (46) through the eighth one-way valve (64) and the ninth one-way valve (66). The fifth manual ball valve (63) connects the oil port CA on the auxiliary hydraulic control oil circuit block (46) and the fuel tank (1). The sixth manual ball valve (65) connects the oil port CC on the auxiliary hydraulic control oil circuit block (46) and the fuel tank (1).

10. An energy-saving internal mixer hydraulic system for controlling pressure and flow rate of a servo motor, characterized in that: The circulating cooling and filtering device (01) includes a motor (7), a hydraulic pump (8), a cooling filter (9), a cooler (10), a water filter (11), a first manual ball valve (12), a tenth one-way valve (13), a high-pressure throttle valve (16), and a low-pressure throttle valve (19). The hydraulic pump (8) is respectively connected to the fuel tank (1), the motor (7), and the cooler (10). The cooler (10) is also respectively connected to the water filter (11), the high-pressure throttle valve (16), and the low-pressure throttle valve (19). The high-pressure throttle valve (16) and the low-pressure throttle valve (19) are respectively communicated with the inlet ports of a high-pressure servo motor (14) and a low-pressure servo motor (17). A tenth one-way valve (13), a first manual ball valve (12), and a cooling filter (9) are sequentially connected between the cooler (10) and the fuel tank (1), and the cooling filter (9) is close to the fuel tank (1).

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