Sintering furnace pressure maintaining and pressurizing pump station system and pressure maintaining working method

Abstract

The invention discloses a sintering furnace pressure maintaining and pressurizing pump station system and a pressure maintaining working method. The sintering furnace pressure maintaining and pressurizing pump station system comprises an oil supply assembly, an overflow valve safety valve set, a reversing valve control valve set, an energy accumulator and pressure gauge assembly and an electric cabinet assembly. The overflow valve safety valve set adopts the double-stop electromagnetic valve and the proportional overflow valve, the precision of the proportional overflow valve reaches one thousandth, the pressure maintaining precision of the hydraulic oil cylinder is improved, and work is more reliable; the hydraulic pressure maintaining and boosting system of any one of the three branches can be stopped at any time, pressure relief, cylinder retraction and restart are achieved, the set value is automatically adjusted, and the working states of other branches are not affected. The hydraulic oil tank is provided with the electronic temperature and liquid integrated switch, the liquid level and the temperature of hydraulic oil in the hydraulic oil tank are directly displayed on a self-mounted electronic display screen, the liquid level and the temperature of the hydraulic oil can be output to the PLC in a switching value or analog quantity mode, and higher economic benefits are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic system pressure maintaining and boosting, and in particular to a sintering furnace pressure maintaining and boosting pump station system and a pressure maintaining working method. Background Art

[0002] Sintering is a process of compacting materials and forming solid blocks by heating or pressurizing them, but not melting them to the liquefaction point. Sintering furnace refers to a special equipment that makes powder compacts obtain the required physical, mechanical properties and microstructure through sintering. Sintering furnace is used to dry the slurry on the silicon wafer, remove the organic components in the slurry, and complete the sintering of aluminum back field and gate line.

[0003] In order to ensure the smooth dewaxing (lubricant or forming agent), reduction, alloying, and organizational transformation of the powder compact during sintering, it is necessary to accurately control the sintering temperature, protective atmosphere, compact conveying method, heating and cooling speed, etc. The precise control system is the hydraulic system of the sintering furnace pressure-maintaining and pressurizing pump station automatically controlled by the remote PLC programmable controller.

[0004] The existing sintering furnace pressure-maintaining and boosting pump station hydraulic system still has many deficiencies in actual work, such as narrow pressure-maintaining and boosting range, low pressure-maintaining accuracy, inability to realize simultaneous operation of multiple branches, and inability to stop pressure relief in any branch at any time without affecting the working conditions of other branches. Summary of the invention

[0005] The object of the present invention is to provide a sintering furnace pressure-maintaining and pressurizing pump station system to solve the problems raised in the above-mentioned background technology.

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

[0007] A sintering furnace pressure-maintaining and pressurizing pump station system, including an oil supply assembly, a relief valve safety valve group, a reversing valve control valve group, an accumulator and a pressure gauge integration and an electric control box assembly, the relief valve safety valve group includes a relief valve safety valve block, a first check valve, a second check valve, a pressure measuring joint, a pressure sensor, a relief valve, a double-stop solenoid valve and a proportional relief valve, the first check valve is arranged in the manual pump oil circuit, the second check valve is arranged in the main oil circuit, the double-stop solenoid valve and the proportional relief valve form an electromagnetic ratio An overflow oil circuit is provided for proportionally overflowing the hydraulic oil in the system oil circuit back to the hydraulic oil tank; the reversing valve control valve group includes a reversing valve control valve block and three reversing valve control valve group branches arranged above it, each reversing valve control valve group branch includes a superimposed electric-controlled hydraulic lock, a three-position four-way solenoid reversing valve, a superimposed hydraulic-controlled check valve, a three-position four-way manual reversing valve, a pressure sensor and a pressure measuring joint, and the superimposed electric-controlled hydraulic lock is composed of a superimposed valve block, a leakage-free double-cutoff solenoid valve and a hydraulic-controlled check valve.

[0008] As a further solution of the present invention: it also includes a base assembly, which is the carrier of the hydraulic system, and other assemblies are directly or indirectly fixed on the base assembly. The base assembly is mainly composed of a base, a lifting lug and an oil collecting tank. A lifting lug is provided at each of the four corners of the base, and an oil collecting tank is provided in the middle of the base.

[0009] As a further solution of the present invention: the oil supply assembly is arranged on one side of the oil collecting tank in the base assembly, and the oil supply assembly includes a hydraulic oil tank, an oil drain ball valve, a manual ball valve, a manual pump oil suction filter, a manual oil pump, an oil cleaning port, a liquid level and temperature gauge, a heater, an oil return filter, an electronic temperature-liquid integrated switch, an air filter, a gear pump vertical motor unit, a main pump oil suction filter and a high-pressure filter. The hydraulic oil tank is the carrier of the oil supply assembly, and other hydraulic components of the oil supply assembly are directly or indirectly arranged on the hydraulic oil tank; an oil drain ball valve and a manual ball valve are arranged at the lower end of the front box plate of the hydraulic oil tank, a manual pump oil suction filter is arranged at the front end of the manual ball valve, the manual pump oil suction filter is located inside the hydraulic oil tank, and a manual oil pump is arranged at the rear end of the manual ball valve, and the three form a manual pump oil circuit; the hydraulic A cleaning oil port is arranged on the right box plate of the oil tank, a liquid level and temperature gauge is arranged on the left box plate of the hydraulic oil tank, a heater is arranged on the left box plate of the hydraulic oil tank, an oil return filter, an electronic temperature-liquid integrated switch and an air filter are arranged on the top box plate of the hydraulic oil tank, a gear pump vertical motor group is arranged on the top box plate of the hydraulic oil tank, the gear pump vertical motor group consists of a motor, a bell housing, a coupling and a gear pump, the motor is located outside the hydraulic oil tank, and the bell housing, the coupling and the gear pump are located inside the hydraulic oil tank, the oil suction port of the gear pump is connected to the main pump oil suction filter, the pressure oil port of the gear pump vertical motor group is connected to the high-pressure filter, the main pump oil suction filter is located below the liquid level inside the hydraulic oil tank, and the high-pressure filter is located outside the hydraulic oil tank, in the middle of the top box plate of the hydraulic oil tank.

[0010] As a further solution of the present invention: the accumulator and the pressure gauge are integrated on the front box plate of the hydraulic oil tank, and the accumulator and the pressure gauge integration mainly include a main system pressure gauge, a first branch pressure gauge, a second branch pressure gauge, a third branch pressure gauge, a first branch accumulator, a second branch accumulator, a third branch accumulator, an accumulator bracket, an accumulator clamp and an accumulator rubber pad, etc. The main system pressure gauge is used to display the system oil pressure of the gear pump and the manual pump outlet, and the first branch pressure gauge, the second branch pressure gauge, and the third branch pressure gauge are used to display the first branch pressure respectively. , the second branch, and the third branch cylinder rodless chamber pressures, the first branch accumulator, the second branch accumulator, and the third branch accumulator are respectively used to display the pressure pulsation absorbed when the rodless chambers of the hydraulic cylinders of the first branch, the second branch, and the third branch are pressurized, and serve as auxiliary power sources to extend the pressure holding time of each branch, the first branch accumulator, the second branch accumulator, and the third branch accumulator are arranged on an accumulator bracket and fixed with accumulator clamps, and accumulator rubber pads are used between the first branch accumulator, the second branch accumulator, the third branch accumulator and the accumulator bracket to buffer vibration.

[0011] As a further solution of the present invention: the electric control box assembly is located at a corner of the oil sump of the hydraulic oil tank, and the electric control box assembly includes an electric control box body, a PLC programmable controller, an indicator light and a knob. The electric control box body is a carrier of the PLC programmable controller, the indicator light and the knob, and the PLC programmable controller, the indicator light and the knob are directly installed on or inside the electric control box body.

[0012] As a further solution of the present invention: an automatic pressure maintaining working method of a sintering furnace pressure maintaining and pressurizing pump station system, comprising the following steps:

[0013] S1: Automatically start the motor, the motor drives the gear pump through the coupling to start pumping oil, after the oil fills the main oil circuit connected to the gear pump and the second one-way valve, the hydraulic oil pressure increases, when the hydraulic oil pressure equals the opening pressure of the second one-way valve, the second one-way valve opens, the hydraulic oil enters the main system oil circuit, the main system pressure gauge and the display screen of the PLC programmable controller display the main system pressure;

[0014] S2: As the hydraulic oil continues to enter the main system, the main system pressure gradually increases after the hydraulic oil fills the main system oil circuit. When the main system pressure reaches the opening pressure of the relief valve, the relief valve opens, and the hydraulic oil passes through the relief valve. At this time, the PLC programmable controller controls the reversal of the three-position four-way solenoid reversing valve of the first branch and the opening of the double-stop solenoid valve without leakage in the superimposed electric-controlled hydraulic lock of the first branch, and supplies high-pressure hydraulic oil to the rodless chamber of the hydraulic cylinder of the first branch. The pressure gauge of the first branch and the display screen of the PLC programmable controller display the pressure of the first branch, and the piston rod of the hydraulic cylinder of the first branch extends outward, which is conducive to the burning of Apply pressure to the powder in the compacting furnace to compact the powder according to the shape of the compact. When the pressure in the rodless chamber of the hydraulic cylinder of the first branch reaches the required pressure, the PLC programmable controller controls the reversal of the three-position four-way electromagnetic reversing valve of the first branch and the closing of the double-stop electromagnetic valve without leakage in the superimposed electric-controlled hydraulic lock of the first branch. The first branch hydraulic system maintains pressure under the action of the superimposed electric-controlled hydraulic lock of the first branch, the superimposed hydraulic-controlled one-way valve of the first branch and the accumulator of the first branch. In this way, after the second branch and the third branch are pressurized according to the pressure requirements, the PLC programmable controller controls the motor to stop running.

[0015] S3: When the three branches are maintaining pressure, as the hydraulic oil in the pressure-maintaining branches slowly leaks, the pressure of the three branches slowly decreases. When the PLC programmable controller detects that the pressure in the rodless chamber of the cylinder in a certain branch has reached the minimum value required for maintaining pressure, the PLC programmable controller controls the motor to start running again. At the same time, the double-stop solenoid valve opens, and the system hydraulic oil overflows through the proportional relief valve. The pressure of the proportional relief valve is adjusted to supplement the pressure of this branch. At the same time, the three-position four-way solenoid reversing valve of this branch is reversed, and the double-stop solenoid valve is opened to supplement high-pressure hydraulic oil to this branch until the maximum pressure value of this branch is reached.

[0016] As a further solution of the present invention: the three branches in S2 can be maintained at the same pressure or at different pressures. When the pressures of the three branches are different, the overflow pressure value of the overflow valve is adjusted to the maximum value of the three branch pressures.

[0017] As a further solution of the present invention: a manual pressure maintaining working method of a sintering furnace pressure maintaining and pressurizing pump station system comprises the following steps:

[0018] S1: Open the manual ball valve, put the operating rod into the pumping hole of the manual oil pump, and continue to operate the manual oil pump to start pumping oil. When the pressure in the manual oil circuit reaches the opening pressure of the first one-way valve, the first one-way valve opens, hydraulic oil enters the system oil circuit, and the main system pressure gauge displays the system pressure;

[0019] S2: When the main system pressure reaches the minimum pressure among the three branches, the three-position four-way manual reversing valve of this branch is opened to fill the rodless chamber of the oil cylinder of this branch with hydraulic oil. The branch pressure gauge displays the pressure of this branch. When the pressure displayed by the branch pressure gauge reaches the maximum pressure of the branch, the three-position four-way manual reversing valve is reversed. Under the action of the branch superimposed hydraulic control check valve, superimposed electric control hydraulic lock and accumulator, the branch is pressure-maintained. Similarly, other branches are also in a pressure-maintaining state.

[0020] S3: Observe the indications of the pressure gauges of the first branch, the second branch and the third branch to find out which branch's pressure value reaches the minimum pressure value for maintaining pressure. While the manual oil pump is pumping oil, start opening the three-position four-way manual reversing valve of the branch to replenish the high-pressure hydraulic oil pumped by the manual oil pump to the branch until the pressure of the branch reaches the maximum pressure value for maintaining pressure. The three-position four-way manual reversing valve is reversed, and manual oil replenishment is completed. Repeat this process to replenish oil in a cycle.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The relief valve safety valve group of the present invention adopts a double cut-off solenoid valve and a proportional relief valve. The precision of the proportional relief valve reaches one thousandth, which improves the pressure-maintaining precision of the hydraulic cylinder and makes the work more reliable;

[0023] 2. The hydraulic pressure-maintaining and pressure-increasing system of any of the three branches in the present invention can be stopped at any time to release the pressure, close the cylinder, and restart to automatically adjust to the set value, and the working state of other branches will not be affected;

[0024] 3. The hydraulic oil tank of the present invention is provided with an electronic temperature-liquid integrated switch, which not only directly displays the liquid level and temperature of the hydraulic oil in the hydraulic oil tank on the self-installed electronic display screen, but also outputs the liquid level and temperature of the hydraulic oil to the PLC programmable controller in the form of switch quantity or analog quantity, which has higher economic benefits;

[0025] 4. The hydraulic pressure-maintaining and pressure-increasing system of the three branches of the present invention can use a PLC programmable controller to control the motor, solenoid valve and other automatic pressure-increasing, and can also use a manual pump to pump oil to supply pressure to a manual reversing valve, so that the hydraulic pressure-maintaining and pressure-increasing system of the present invention has double insurance and improves the safety of the equipment;

[0026] 5. The hydraulic pressure-maintaining and boosting system of the three branches of the present invention adopts an accumulator for pressure maintenance. The accumulator can absorb the pulsation of the hydraulic oil during the boosting and can also be used as an auxiliary power source to extend the pressure-maintaining time in the branch, making the hydraulic pressure-maintaining and boosting system of the present invention more stable and reliable, and improving the safety of the equipment;

[0027] 6. The hydraulic pressure-maintaining and boosting system of the three branches of the present invention is automatically controlled by a PLC programmable controller, making the hydraulic pressure-maintaining and boosting system of the present invention more automated and intelligent;

[0028] The hydraulic system of the sintering furnace pressure-maintaining and pressurizing pump station of the present invention is more automated and intelligent, operates more stably, is safer and more reliable, and has higher economic and practical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A stereoscopic diagram of the sintering furnace pressure-maintaining and pressurizing pump station system of the present invention;

[0030] Figure 2 It is a stereogram of the base assembly of the present invention;

[0031] Figure 3 The oil supply assembly of the present invention is three-dimensional Figure 1 ;

[0032] Figure 4 The oil supply assembly of the present invention is three-dimensional Figure 2 ;

[0033] Figure 5 A three-dimensional diagram of the overflow valve safety valve assembly of the present invention

[0034] Figure 6 The directional control valve group of the present invention is a three-dimensional Figure 1 ;

[0035] Figure 7 The directional control valve group of the present invention is a three-dimensional Figure 2 ;

[0036] Figure 8 A three-dimensional diagram of a superimposed electric-controlled hydraulic lock of a reversing valve control valve group of the present invention;

[0037] Fig. 9 It is an integrated stereogram of the accumulator and the pressure gauge of the present invention;

[0038] Fig.10 It is a three-dimensional diagram of the electric control box assembly of the present invention;

[0039] Fig.11 This is a schematic diagram of the sintering furnace pressure-maintaining and pressurizing pump station system of the present invention;

[0040] In the figure: 1-base assembly, 2-oil supply assembly, 3-overflow valve safety valve group, 4-reversing valve control valve group, 5-accumulator and pressure gauge assembly, 6-electric control box assembly

[0041] Base, 1.2-lifting ear, 1.3-oil collecting trough, 2.1-hydraulic oil tank, 2.2-oil drain ball valve, 2.3-manual ball valve, 2.4-manual pump oil suction filter, 2.5-manual oil pump, 2.6-oil cleaning port, 2.7-liquid level and temperature gauge, 2.8-heater, 2.9-return oil filter, 2.10-electronic temperature and liquid integrated switch, 2.11-air filter, 2.12-gear pump vertical motor unit, 2.13-main pump oil suction filter, 2.14-high pressure filter, 2.15-motor, 2.16-bell cover, 2.17-coupling, 2.18-gear pump, 3.1-Relief valve safety valve block, 3.2-First check valve, 3.3-Second check valve, 3.4-Relief valve pressure measuring joint, 3.5-Relief valve pressure sensor, 3.6-Relief valve, 3.7-Dual cut-off solenoid valve, 3.8-Proportional relief valve, 4.1-Directional valve control valve block, 4.2-First branch superimposed electric hydraulic lock, 4.3-Second branch superimposed electric hydraulic lock, 4.4-Third branch superimposed electric hydraulic lock, 4.5-First branch three-position four-way solenoid reversing valve, 4.6-Second branch three-position four-way solenoid reversing valve, 4.7-Third branch three-position four-way solenoid reversing valve 4.8-First branch superimposed hydraulic control non-return valve, 4.9-Second branch superimposed hydraulic control non-return valve, 4.10-Third branch superimposed hydraulic control non-return valve, 4.11-First branch three-position four-way manual reversing valve, 4.12-Second branch three-position four-way manual reversing valve, 4.13-Third branch three-position four-way manual reversing valve, 4.14-First branch reversing valve pressure sensor, 4.15-Second branch reversing valve pressure sensor, 4.16-Third branch reversing valve pressure sensor, 4.17-First branch reversing valve pressure measuring joint, 4.18-Second branch reversing valve pressure measuring joint, 4 .19-pressure measuring joint of the third branch reversing valve, 4.20-superimposed valve block, 4.21-leakage-free double-stop solenoid valve, 4.22-hydraulic-controlled one-way valve, 5.1-main system pressure gauge, 5.2-first branch pressure gauge, 5.3-second branch pressure gauge, 5.4-third branch pressure gauge, 5.5-first branch accumulator, 5.6-second branch accumulator, 5.7-third branch accumulator, 5.8-accumulator bracket, 5.9-accumulator clamp, 5.10-accumulator rubber pad, 6.1-electric control box, 6.2-PLC programmable controller, 6.3-indicator light and knob. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1-11 The present invention provides a technical solution: a sintering furnace pressure maintaining and boosting pump station system, including a base assembly 1, an oil supply assembly 2, an overflow valve safety valve group 3, a reversing valve control valve group 4, an accumulator and pressure gauge integration 5 and an electric control box assembly 6.

[0044] Specifically, see Figure 1 , Figure 2 and Fig.11 The base assembly 1 is the carrier of the hydraulic system of the sintering furnace pressure-maintaining and boosting pump station of the present invention. Other assemblies are directly or indirectly fixed on the base assembly 1. The base assembly 1 is mainly composed of a base 1.1, a lifting lug 1.2 and an oil collecting tank 1.3. The base 1.1 is the foundation of the base assembly 1; a lifting lug 1.2 is provided at each of the four corners of the base 1.1, and its function is to facilitate lifting; an oil collecting tank 1.3 is provided in the middle of the base 1.1, and the oil collecting tank 1.3 mainly functions to collect and store leaked hydraulic oil to prevent the hydraulic oil from dripping directly onto the point surface and polluting the environment.

[0045] Specifically, see Figure 1 , Figure 3 , Figure 4 and Fig.11The oil supply assembly 2 is arranged on one side of the oil collecting tank 1.3 in the base assembly 1, and its function is to provide a hydraulic oil source for the sintering furnace pressure-maintaining and pressurizing pump station system, and to convert mechanical energy into liquid pressure energy to provide power for the sintering furnace pressure-maintaining and pressurizing pump station system. The oil supply assembly 2 mainly includes a hydraulic oil tank 2.1, an oil drain ball valve 2.2, a manual ball valve 2.3, a manual pump oil suction filter 2.4, a manual oil pump 2.5, a cleaning oil port 2.6, a liquid level and temperature gauge 2.7, a heater 2.8, an oil return filter 2.9, an electronic temperature-liquid integrated switch 2.10, an air filter 2.11, a gear pump vertical motor unit 2.12, a main pump oil suction filter 2.13 and a high-pressure filter 2.14, etc. The hydraulic oil tank 2.1 is the carrier of the oil supply assembly 2, and the other hydraulic components of the oil supply assembly 2 are directly or indirectly arranged on the hydraulic oil tank 2.1; the main functions of the hydraulic oil tank 2.1 include storing oil, dissipating heat, separating bubbles and impurities, providing installation positions, and balancing system pressure. A drain ball valve 2.2 and a manual ball valve 2.3 are arranged at the lower end of the front side box plate of the hydraulic oil tank 2.1; the drain ball valve 2.2 is the manual drain switch of the hydraulic oil tank 2.1, and its function is to release the hydraulic oil in the hydraulic oil tank 2.1. A manual pump oil suction filter 2.4 is arranged at the front end of the manual ball valve 2.3, and the manual pump oil suction filter 2.4 is located inside the hydraulic oil tank 2.1. A manual oil pump 2.5 is arranged at the rear end of the manual ball valve 2.3, and the three form a manual pump oil circuit. The manual ball valve 2.3 is used as a manual switch for the manual pump oil circuit; the manual pump oil suction filter 2.4 is used to coarsely filter the hydraulic oil entering the manual pump oil circuit; the manual oil pump 2.5 is used to manually pump high-pressure hydraulic oil through the overflow valve safety valve group 3. The manual pump is used to pump hydraulic oil only in an emergency situation when there is no electricity. A cleaning oil port 2.6 is provided in the middle of the right box plate of the hydraulic oil tank 2.1, and its function is to facilitate the cleaning of the inner box wall of the hydraulic oil tank 2.1. A liquid level and liquid temperature gauge 2.7 is provided in the middle and upper part of the left box plate of the hydraulic oil tank 2.1, and its function is to directly monitor the liquid level and temperature of the hydraulic oil in the hydraulic oil tank 2.1. A heater 2.8 is provided in the middle and lower part of the left box plate of the hydraulic oil tank 2.1, and its function is to heat the low-temperature hydraulic oil. A return oil filter 2.9, an electronic temperature-liquid integrated switch 2.10 and an air filter 2.11 are provided on the right side of the top box plate of the hydraulic oil tank 2.1. The function of the return oil filter 2.9 is to filter out the pollutants generated or invaded in the hydraulic system before returning to the oil tank. The return oil filter 2.9 is one of the most important filters for controlling the pollution cleanliness of the control system. The return oil filter 2.9 is equipped with a flooding device for filter element clogging alarm. The function of the electronic temperature-liquid integrated switch 2.10 is not only to directly display the liquid level and temperature of the hydraulic oil in the hydraulic oil tank 2.1 on the self-installed electronic display screen, but also to output the liquid level and temperature of the hydraulic oil to the PLC programmable controller 6.2 in the form of switch quantity or analog quantity.The air filter 2.11 is used to filter out dust and sand in the air to ensure that sufficient and clean air enters the hydraulic oil tank 2.1. A gear pump vertical motor group 2.12 is arranged on the left side of the top box plate of the hydraulic oil tank 2.1. The gear pump vertical motor group 2.12 mainly consists of a motor 2.15, a bell 2.16, a coupling 2.17 and a gear pump 2.18. The motor 2.15 is located outside the hydraulic oil tank 2.1, while the bell 2.16, the coupling 2.17 and the gear pump 2.18 are located inside the hydraulic oil tank 2.1. The oil suction port of the gear pump 2.18 is connected to the main pump oil suction filter 2.13, and the pressure oil port of the gear pump vertical motor group 2.12 is connected to the high-pressure filter 2.14. The main pump oil suction filter 2.13 is located below the liquid level inside the hydraulic oil tank 2.1, and the high-pressure filter 2.14 is located outside the hydraulic oil tank 2.1, in the middle of the top box plate of the hydraulic oil tank 2.1. The main pump oil suction filter 2.13, the gear pump 2.18 and the high-pressure filter 2.14 form a main oil circuit, that is, the motor 2.15 drives the gear pump 2.18 through the bell 2.16 and the coupling 2.17 to pump the hydraulic oil coarsely filtered by the main pump oil suction filter 2.13, and provides the overflow valve safety valve group 3 with high-pressure hydraulic oil finely filtered by the high-pressure filter 2.14.

[0046] Specifically, see Figure 1 , Figure 5 and Fig.11The overflow valve safety valve group 3 is arranged in the oil collecting tank 1.3 of the base assembly 1, in front of the hydraulic oil tank 2.1, and its function is to safely overflow the excess high-pressure hydraulic oil that has been finely filtered by the high-pressure filter 2.13 back to the hydraulic oil tank 2.1. The overflow valve safety valve group 3 mainly includes an overflow valve safety valve block 3.1, a first non-return valve 3.2, a second non-return valve 3.3, a pressure measuring joint 3.4, a pressure sensor 3.5, an overflow valve 3.6, a double-stop solenoid valve 3.7 and a proportional overflow valve 3.8. The relief valve safety valve block 3.1 is both a carrier of other components of the relief valve safety valve group 3 and a channel body connected to other components of the relief valve safety valve group 3. The first one-way valve 3.2 is arranged in the manual pump oil circuit, and its function is to prevent the high-pressure hydraulic oil pumped by the gear pump 2.18 from flowing to the manual oil pump 2.5, thereby protecting the safety of the manual oil pump 2.5; the second one-way valve 3.3 is arranged in the main oil circuit, and its function is to prevent the high-pressure hydraulic oil pumped by the manual oil pump 2.5 from flowing to the gear pump 2.18, thereby protecting the safety of the gear pump 2.18; the manual pump oil circuit passing through the first one-way valve 3.2 and the main oil circuit passing through the second one-way valve 3.3 are in the relief valve safety valve block 3. 1 merges to form a system oil circuit; the pressure measuring joint 3.4 is connected to the pressure gauge 5.1 to display the pressure of the system oil circuit; the pressure sensor 3.5 transmits the pressure of the system oil circuit to the PLC programmable controller 6.2 in the form of a signal; the function of the overflow valve 3.6 is to safely overflow the hydraulic oil that has not passed through the second non-return valve 3.3 of the main oil circuit back to the hydraulic oil tank 2.1; the double-stop solenoid valve 3.7 and the proportional overflow valve 3.8 form an electromagnetic proportional overflow oil circuit, which is used to proportionally overflow the hydraulic oil in the system oil circuit back to the hydraulic oil tank 2.1; the double-stop solenoid valve 3.7 is an electric switch of the electromagnetic proportional overflow oil circuit, which is directly controlled by the PLC programmable controller 6.2.

[0047] Specifically, see Figure 1 , Figure 6 , Figure 7 , Figure 8 and Fig.11The reversing valve control valve group 4 is arranged in the oil collecting tank 1.3 of the base plate assembly 1, in the middle of the front side of the hydraulic oil tank 2.1, and its function is to control the reversing of the hydraulic cylinder of the final actuator. The reversing valve control valve group 4 mainly includes a reversing valve control valve block 4.1, a first branch superimposed electric-controlled hydraulic lock 4.2, a second branch superimposed electric-controlled hydraulic lock 4.3, a third branch superimposed electric-controlled hydraulic lock 4.4, a first branch three-position four-way electromagnetic reversing valve 4.5, a second branch three-position four-way electromagnetic reversing valve 4.6, a third branch three-position four-way electromagnetic reversing valve 4.7, a first branch superimposed hydraulic-controlled one-way valve 4.8, and a second branch superimposed hydraulic-controlled one-way valve 4. 9, the third branch superimposed hydraulically controlled one-way valve 4.10, the first branch three-position four-way manual reversing valve 4.11, the second branch three-position four-way manual reversing valve 4.12, the third branch three-position four-way manual reversing valve 4.13, the first branch pressure sensor 4.14, the second branch pressure sensor 4.15, the third branch pressure sensor 4.16, the first branch pressure measuring joint 4.17, the second branch pressure measuring joint 4.18 and the third branch pressure measuring joint 4.19, etc. The valves and pressure measuring devices used in the three branches are exactly the same, and the reversing valve control valve block 4.1 is both the carrier of the other components of the reversing valve control valve group 4 and the channel body connecting the other components of the reversing valve control valve group 4.The first branch superimposed electric-controlled hydraulic lock 4.2, the second branch superimposed electric-controlled hydraulic lock 4.3, and the third branch superimposed electric-controlled hydraulic lock 4.4 are respectively used to electrically control the pressure maintenance of the three branches; the first branch superimposed electric-controlled hydraulic lock 4.2, the second branch superimposed electric-controlled hydraulic lock 4.3, and the third branch superimposed electric-controlled hydraulic lock 4.4 are all composed of a superimposed valve block 4.20, a leak-free double-stop solenoid valve 4.21, and a hydraulically controlled one-way valve 4.22; the superimposed valve block 4.20 It is not only the carrier of the leak-free double-stop solenoid valve 4.21 and the hydraulic-controlled one-way valve 4.22, but also the channel body connected to the double-stop solenoid valve 4.21 and the hydraulic-controlled one-way valve 4.22. The leak-free double-stop solenoid valve 4.21 is used for maintaining the pressure of the rodless chamber of the oil cylinder, and the hydraulic-controlled one-way valve 4.22 is used for maintaining the pressure of the rod chamber of the oil cylinder; the first branch three-position four-way solenoid reversing valve 4.5, the second branch three-position four-way solenoid reversing valve 4.6, and the third branch three-position four-way solenoid reversing valve 4.7 are used for electrically controlling The first branch superimposed hydraulically controlled non-return valve 4.8, the second branch superimposed hydraulically controlled non-return valve 4.9, and the third branch superimposed hydraulically controlled non-return valve 4.10 are respectively used for maintaining the pressure of the three branches manually controlled; the first branch three-position four-way manual reversing valve 4.11, the second branch three-position four-way manual reversing valve 4.12, and the third branch three-position four-way manual reversing valve 4.13 are respectively used for manually controlling the inlet and outlet of the three branches; the first branch pressure sensor 4.14, the second branch pressure sensor 4.15, and the third branch pressure sensor 4.16 are respectively used for manually controlling the inlet and outlet of the three branches; The branch pressure sensor 4.15 and the third branch pressure sensor 4.16 transmit pressure signals to the PLC programmable controller 6.2 for the three branches respectively; the first branch pressure measuring joint 4.17, the second branch pressure measuring joint 4.18 and the third branch pressure measuring joint 4.19 are respectively arranged in the rodless oil circuits of the cylinders in the three branches, and are respectively connected to the first branch pressure gauge 5.2, the second branch pressure gauge 5.3 and the third branch pressure gauge 5.4, so as to respectively display the pressures in the three branches in real time.

[0048] Specifically, see Figure 1 , Fig. 9 and Fig.11The accumulator and pressure gauge integrated 5 is arranged in the middle and upper part of the front box plate of the hydraulic oil tank 2.1. Its function is to increase the auxiliary power oil source for the pressure maintenance of the rodless chamber of the hydraulic oil cylinder in the three branches of the reversing valve control valve group 4, and to display the system pressure and the pressure of the rodless chamber of the three branches that need to be pressure maintained. The accumulator and pressure gauge integrated 5 mainly includes a main system pressure gauge 5.1, a first branch pressure gauge 5.2, a second branch pressure gauge 5.3, a third branch pressure gauge 5.4, a first branch accumulator 5.5, a second branch accumulator 5.6, a third branch accumulator 5.7, an accumulator bracket 5.8, an accumulator clamp 5.9 and an accumulator rubber pad 5.10. The main system pressure gauge 5.1 displays the system oil circuit pressure of the gear pump and the manual pump oil outlet; the first branch pressure gauge 5.2, the second branch pressure gauge 5.3, and the third branch pressure gauge 5.4 respectively display the rodless chamber pressure of the first branch, the second branch, and the third branch cylinders; the first branch accumulator 5.5, the second branch accumulator 5.6, and the third branch accumulator 5.7 respectively absorb the pressure pulsation of the rodless chamber of the hydraulic cylinder of the first branch, the second branch, and the third branch when the pressure is increased, and serve as an auxiliary power source to extend the pressure holding time of each branch; the first branch accumulator 5.5, the second branch accumulator 5.6, and the third branch accumulator 5.7 are arranged on the accumulator bracket 5.8 and fixed with an accumulator clamp 5.9, and an accumulator rubber pad 5.10 is used between the first branch accumulator 5.5, the second branch accumulator 5.6, the third branch accumulator 5.7 and the accumulator bracket 5.8 to buffer vibration.

[0049] Specifically, see Figure 1 , Fig.10 and Fig.11 The electric control box assembly 6 is located at a corner of the oil collecting tank 1.3 of the hydraulic oil tank 2.1. Its function is to place multiple low-voltage switchgear and related control, measurement, signal, protection, regulation and other equipment in one box for easy search and maintenance. The electric control box assembly 6 includes an electric control box 6.1, a PLC programmable controller 6.2, an indicator light and a knob 6.3. The electric control box 6.1 is a carrier of the PLC programmable controller 6.2, the indicator light and the knob 6.3. The PLC programmable controller 6.2, the indicator light and the knob 6.3 are directly installed on or inside the electric control box 6.1. The PLC programmable controller 6.2 can directly display the key parameters of the hydraulic system of the sintering furnace pressure-maintaining and pressure-pressurizing pump station, and can also automatically control the hydraulic system of the sintering furnace pressure-maintaining and pressure-pressurizing pump station according to the displayed key parameters. The indicator light and the knob 6.3 can manually control the hydraulic system of the sintering furnace pressure-maintaining and pressure-pressurizing pump station, and can also display the operating status of the hydraulic system of the sintering furnace pressure-maintaining and pressure-pressurizing pump station.

[0050] Automatic pressure maintaining working method of hydraulic system of sintering furnace pressure maintaining and boosting pump station:

[0051] 1. Automatically start the motor 2.15, which drives the gear pump 2.18 through the coupling 2.17 to start pumping oil. After the oil fills the main oil circuit connected to the gear pump 2.18 and the second one-way valve 3.2, the hydraulic oil pressure increases. When the hydraulic oil pressure is equal to the opening pressure of the second one-way valve 3.2, the second one-way valve 3.2 opens, and the hydraulic oil enters the main system oil circuit. The main system pressure gauge 5.1 and the display screen of the PLC programmable controller 6.2 display the main system pressure.

[0052] 2. As the hydraulic oil continues to enter the main system and fills the main system oil circuit, the main system pressure gradually increases. When the main system pressure reaches the opening pressure of the relief valve 3.6, the relief valve 3.6 opens, and the hydraulic oil passes through the relief valve 3.6. At this time, the PLC programmable controller 6.2 controls the reversal of the three-position four-way solenoid reversing valve 4.5 of the first branch and the opening of the leak-free double-stop solenoid valve 4.21 in the first branch superimposed electric-controlled hydraulic lock 4.2, supplying high-pressure hydraulic oil to the rodless chamber of the first branch hydraulic cylinder. The first branch pressure gauge 5.2 and the display screen of the PLC programmable controller 6.2 display the first branch pressure. The piston rod of the first branch hydraulic cylinder extends outward to apply pressure to the sintering furnace powder, so that the powder is pressed according to the shape of the pressed green sheet. When the rodless chamber pressure of the first branch hydraulic cylinder reaches the required pressure, the pressure of the rodless chamber of the hydraulic cylinder of the first branch reaches the required pressure. When the pressure required is reached, the PLC programmable controller 6.2 controls the reversal of the three-position four-way electromagnetic reversing valve 4.5 of the first branch and the closing of the double-stop electromagnetic valve 4.21 without leakage in the superimposed electric-controlled hydraulic lock 4.2 of the first branch. The first branch hydraulic system maintains pressure under the action of the superimposed electric-controlled hydraulic lock 4.2 of the first branch, the superimposed hydraulic-controlled one-way valve 4.8 of the first branch and the accumulator 5.5 of the first branch. In this way, after the second branch and the third branch are both maintained at pressure according to the pressure requirements, the PLC programmable controller 6.2 controls the motor 2.15 to stop running. The three branches can maintain pressure at the same pressure or at different pressures. When the pressures of the three branches are different, the overflow pressure value of the overflow valve 3.6 is adjusted to the maximum value of the pressures of the three branches.

[0053] 3. When the three branches are pressure-maintaining, as the hydraulic oil in the pressure-maintaining branches slowly leaks, the pressures of the three branches slowly decrease. When the PLC programmable controller detects that the rodless chamber pressure of the oil cylinder in a certain branch reaches the minimum value required for pressure maintenance, the PLC programmable controller 6.2 controls the motor 2.15 to start running again. At the same time, the double-stop solenoid valve 3.7 opens, and the system hydraulic oil overflows through the proportional relief valve 3.8. The pressure of the proportional relief valve 3.8 is adjusted to replenish the pressure of this branch. At the same time, the three-position four-way solenoid reversing valve of this branch is reversed, and the double-stop solenoid valve is opened to replenish high-pressure hydraulic oil to this branch until the maximum pressure value of this branch is reached, that is, the three-position four-way solenoid reversing valve is reversed, the double-stop solenoid valve is opened, and the oil replenishment is completed. And so on, the oil replenishment is cyclically performed.

[0054] The hydraulic system of the sintering furnace pressure-maintaining and boosting pump station is in an emergency state without electricity. Manual pressure-maintaining working method:

[0055] 1. Open the manual ball valve 2.3, put the operating rod into the pumping operation hole of the manual oil pump 2.5, and continue to operate the manual oil pump 2.5 to start pumping oil. When the pressure in the manual oil circuit reaches the opening pressure of the first check valve 3.2, the first check valve 3.2 opens, the hydraulic oil enters the system oil circuit, and the main system pressure gauge 5.1 displays the system pressure.

[0056] 2. When the main system pressure reaches the minimum pressure among the three branches, open the three-position four-way manual reversing valve of this branch, fill the rodless chamber of the oil cylinder of this branch with hydraulic oil, and the branch pressure gauge displays the pressure of this branch. When the pressure displayed on the branch pressure gauge reaches the maximum pressure of the branch, the three-position four-way manual reversing valve is reversed, and the branch is maintained under the action of the branch superimposed hydraulic control check valve, superimposed electric control hydraulic lock and accumulator. Similarly, other branches are also kept in the pressure-maintaining state.

[0057] 3. Observe the indications of the first branch pressure gauge 5.2, the second branch pressure gauge 5.3, and the third branch pressure gauge 5.4. When the pressure value of a branch reaches the minimum pressure value of the branch, the three-position four-way manual reversing valve of the branch starts to open while the manual oil pump 2.5 pumps oil, and the high-pressure hydraulic oil pumped by the manual oil pump 2.5 is added to the branch until the pressure of the branch reaches the maximum pressure value of the pressure. The three-position four-way manual reversing valve changes direction, and the manual oil replenishment is completed. Repeat this process and circulate the oil replenishment.

[0058] Note: When one of the branches is replenishing high-pressure hydraulic oil, it is detected that other branches also have oil replenishment needs. After the replenishment of the branch is completed, the oil replenishment needs of other branches will be processed.

[0059] Working Principle: The working principle of hydraulic system is mainly based on Pascal's law, which is a principle of fluid statics that states that in a closed liquid, pressure will be transmitted uniformly from one point to other points.

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sintering furnace pressure maintaining and boosting pump station system, characterized in that: The invention comprises an oil supply assembly (2), a relief valve safety valve group (3), a reversing valve control valve group (4), an accumulator and pressure gauge assembly (5) and an electric control box assembly (6); the relief valve safety valve group (3) comprises a relief valve safety valve block (3.1), a first one-way valve (3.2), a second one-way valve (3.3), a relief valve pressure measuring joint (3.4), a relief valve pressure sensor (3.5), a relief valve (3.6), a double-stop solenoid valve (3.7) and a proportional relief valve (3.8); the first one-way valve (3.2) is arranged in the manual pump oil circuit, the second one-way valve (3.3) is arranged in the main oil circuit, and the double-stop solenoid valve (3.7) is arranged in the main oil circuit. ), a proportional overflow valve (3.8) forms an electromagnetic proportional overflow oil circuit for overflowing the hydraulic oil in the system oil circuit proportionally back to the hydraulic oil tank (2.1); the reversing valve control valve group (4) comprises a reversing valve control valve block (4.1) and three reversing valve control valve group branches arranged above the reversing valve control valve block, each reversing valve control valve group branch comprises a stacked electric-controlled hydraulic lock, a three-position four-way electromagnetic reversing valve, a stacked hydraulic-controlled check valve, a three-position four-way manual reversing valve, a reversing valve pressure sensor and a reversing valve pressure measuring joint, and the stacked electric-controlled hydraulic lock is composed of a stacked valve block (4.20), a leak-free double-stop electromagnetic valve (4.21) and a hydraulic-controlled check valve (4.22).

2. A sintering furnace pressure-maintaining and pressurizing pump station system according to claim 1, characterized in that: The invention also comprises a base assembly (1), which is a carrier of the hydraulic system, and other assemblies are directly or indirectly fixed on the base assembly (1). The base assembly (1) mainly comprises a base (1.1), a lifting lug (1.2) and an oil collecting tank (1.3). Each of the four corners of the base (1.1) is provided with a lifting lug (1.2), and the oil collecting tank (1.3) is provided in the middle of the base (1.1).

3. A sintering furnace pressure-maintaining and pressurizing pump station system according to claim 2, characterized in that: The oil supply assembly (2) is arranged on one side of the oil collecting tank (1.3) in the base assembly (1), and comprises a hydraulic oil tank (2.1), an oil drain ball valve (2.2), a manual ball valve (2.3), a manual pump oil suction filter (2.4), a manual oil pump (2.5), an oil cleaning port (2.6), a liquid level and temperature gauge (2.7), a heater (2.8), an oil return filter (2.9), an electronic temperature-liquid integrated switch (2.10), an air filter (2.11), a gear pump vertical motor unit (2.12), a main pump oil suction filter (2.13) and a high-pressure filter (2.14). The hydraulic oil tank (2.1) is a carrier of the oil supply assembly (2), and other hydraulic components of the oil supply assembly (2) are directly or indirectly arranged on the hydraulic oil tank (2.1); a drain ball valve (2.2) and a manual ball valve (2.3) are arranged at the lower end of the front box plate of the hydraulic oil tank (2.1); a manual pump oil suction filter (2.4) is arranged at the front end of the manual ball valve (2.3); the manual pump oil suction filter (2.4) is located inside the hydraulic oil tank (2.1); a manual oil pump (2.5) is arranged at the rear end of the manual ball valve (2.3); the three form a manual pump oil circuit; a cleaning oil port (2.6) is arranged on the right box plate of the hydraulic oil tank (2.1) 2.6), a liquid level and liquid temperature gauge (2.7) is arranged on the left box plate of the hydraulic oil tank (2.1), a heater (2.8) is arranged on the left box plate of the hydraulic oil tank (2.1), a return oil filter (2.9), an electronic temperature-liquid integrated switch (2.10) and an air filter (2.11) are arranged on the top box plate of the hydraulic oil tank (2.1), a gear pump vertical motor group (2.12) is arranged on the top box plate of the hydraulic oil tank (2.1), and the gear pump vertical motor group (2.12) is composed of a motor (2.15), a bell housing (2.16), a coupling (2.17) and a gear pump (2.18) The motor (2.15) is located outside the hydraulic oil tank (2.1), while the bell housing (2.16), the coupling (2.17) and the gear pump (2.18) are located inside the hydraulic oil tank (2.1), the oil suction port of the gear pump (2.18) is connected to the main pump oil suction filter (2.13), the pressure oil port of the gear pump vertical motor group (2.12) is connected to the high-pressure filter (2.14), the main pump oil suction filter (2.13) is located below the liquid level inside the hydraulic oil tank (2.1), and the high-pressure filter (2.14) is located outside the hydraulic oil tank (2.1), in the middle of the top box plate of the hydraulic oil tank (2.1).

4. A sintering furnace pressure-maintaining and pressurizing pump station system according to claim 3, characterized in that: The accumulator and pressure gauge assembly (5) is arranged on the front box plate of the hydraulic oil tank (2.1), and the accumulator and pressure gauge assembly (5) comprises a main system pressure gauge (5.1), a first branch pressure gauge (5.2), a second branch pressure gauge (5.3), a third branch pressure gauge (5.4), a first branch accumulator (5.5), a second branch accumulator (5.6), a third branch accumulator (5.7), an accumulator bracket (5.8), an accumulator clamp (5.9) and an accumulator rubber pad (5.10). The main system pressure gauge (5.1) is used to display the system oil pressure of the gear pump and the manual pump oil outlet, and the first branch pressure gauge (5.2), the second branch pressure gauge (5.3) and the third branch pressure gauge (5.4) are used to display the pressure of the first branch oil outlet, respectively. , the rodless chamber pressure of the oil cylinder of the first branch, the second branch, and the third branch; the first branch accumulator (5.5), the second branch accumulator (5.6), and the third branch accumulator (5.7) are respectively used to display the pressure pulsation absorbed when the rodless chamber of the hydraulic oil cylinder of the first branch, the second branch, and the third branch is pressurized, and serve as an auxiliary power source to extend the pressure holding time of each branch; the first branch accumulator (5.5), the second branch accumulator (5.6), and the third branch accumulator (5.7) are arranged on the accumulator bracket (5.8) and fixed by an accumulator clamp (5.9); an accumulator rubber pad (5.10) is used between the first branch accumulator (5.5), the second branch accumulator (5.6), and the third branch accumulator (5.7) and the accumulator bracket (5.8) to buffer vibration.

5. A sintering furnace pressure-maintaining and pressurizing pump station system according to claim 4, characterized in that: The electric control box assembly (6) is located at a corner of the oil collecting tank (1.3) of the hydraulic oil tank (2.1); the electric control box assembly (6) comprises an electric control box body (6.1), a PLC programmable controller (6.2), an indicator light and a knob (6.3); the electric control box body (6.1) is a carrier of the PLC programmable controller (6.2), the indicator light and the knob (6.3); the PLC programmable controller (6.2), the indicator light and the knob (6.3) are directly mounted on or inside the electric control box body (6.1).

6. The automatic pressure maintaining working method of the pressure maintaining and boosting pump station system of a sintering furnace according to any one of claims 1 to 5, characterized in that: The steps include: S1: Automatically start the motor (2.15), the motor (2.15) drives the gear pump (2.18) through the coupling (2.17) to start pumping oil, and after the oil fills the main oil circuit connected to the gear pump (2.18) and the second one-way valve (3.3), the hydraulic oil pressure increases. When the hydraulic oil pressure is equal to the opening pressure of the second one-way valve (3.3), the second one-way valve (3.3) opens, and the hydraulic oil enters the main system oil circuit. The main system pressure gauge (5.1) and the display screen of the PLC programmable controller (6.2) display the main system pressure; S2: As the hydraulic oil continues to enter the main system, the main system oil circuit is filled with the hydraulic oil, and the main system pressure gradually increases. When the main system pressure reaches the opening pressure of the relief valve (3.6), the relief valve (3.6) opens, and the hydraulic oil passes through the relief valve (3.6). At this time, the PLC programmable controller (6.2) controls the first branch three-position four-way electromagnetic reversing valve (4.5) to change direction and the first branch superimposed electric control hydraulic lock (4.2) to open the double cut-off electromagnetic valve (4.21) without leakage, and supplies high-pressure hydraulic oil to the rodless chamber of the first branch hydraulic cylinder. The first branch pressure gauge (5.2) and the display screen of the PLC programmable controller (6.2) display the first branch pressure, and the piston rod of the first branch oil cylinder extends outward, which burns the Pressure is applied to the powder in the compacting furnace to compact the powder according to the shape of the compact. When the pressure in the rodless chamber of the hydraulic oil cylinder of the first branch reaches the required pressure, the PLC programmable controller (6.2) controls the reversal of the three-position four-way electromagnetic reversing valve (4.5) of the first branch and the closing of the double-stop electromagnetic valve (4.21) without leakage in the first branch superimposed electric-controlled hydraulic lock (4.2). The first branch hydraulic system maintains pressure under the action of the first branch superimposed electric-controlled hydraulic lock (4.2), the first branch superimposed hydraulic-controlled one-way valve (4.8) and the first branch accumulator (5.5). In this way, after the second branch and the third branch are both maintained according to the pressure requirements, the PLC programmable controller (6.2) controls the motor (2.15) to stop running. S3: When the three branches are pressure-maintaining, as the hydraulic oil in the pressure-maintaining branch gradually leaks, the pressure of the three branches gradually decreases. When the PLC programmable controller detects that the pressure of the rodless chamber of the cylinder in a branch reaches the minimum value required for pressure maintenance, the PLC programmable controller (6.2) controls the motor (2.15) to start running again. At the same time, the double-stop solenoid valve (3.7) opens, and the system hydraulic oil overflows through the proportional relief valve (3.8). The pressure of the proportional relief valve (3.8) is adjusted to replenish the pressure of this branch. At the same time, the three-position four-way solenoid reversing valve of this branch is reversed, and the double-stop solenoid valve is opened to replenish high-pressure hydraulic oil to this branch until the maximum pressure value of this branch is reached.

7. The automatic pressure maintaining working method of the pressure maintaining and boosting pump station system of a sintering furnace according to claim 6 is characterized in that: The three branches in S2 can be maintained at the same pressure or at different pressures. When the pressures of the three branches are different, the overflow pressure value of the overflow valve (3.6) is adjusted to the maximum value of the pressures of the three branches.

8. A manual pressure maintaining working method of a sintering furnace pressure maintaining and boosting pump station system according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Open the manual ball valve (2.3), put the operating rod into the pumping operation hole of the manual oil pump (2.5), and continue to operate the manual oil pump (2.5) to start pumping oil. When the pressure in the manual oil circuit reaches the opening pressure of the first check valve (3.2), the first check valve (3.2) opens, hydraulic oil enters the system oil circuit, and the main system pressure gauge (5.1) displays the system pressure; S2: When the main system pressure reaches the minimum pressure among the three branches, the three-position four-way manual reversing valve of this branch is opened to fill the rodless chamber of the oil cylinder of this branch with hydraulic oil. The branch pressure gauge displays the pressure of this branch. When the pressure displayed by the branch pressure gauge reaches the maximum pressure of the branch, the three-position four-way manual reversing valve is reversed. Under the action of the branch superimposed hydraulic control check valve, superimposed electric control hydraulic lock and accumulator, the branch is pressure-maintained. Similarly, other branches are also in a pressure-maintaining state. S3: Observe the indications of the first branch pressure gauge (5.2), the second branch pressure gauge (5.3), and the third branch pressure gauge (5.4). When the pressure value of a branch reaches the minimum pressure value of the branch, the three-position four-way manual reversing valve of the branch begins to open while the manual oil pump (2.5) pumps oil, and the high-pressure hydraulic oil pumped by the manual oil pump (2.5) is added to the branch until the pressure of the branch reaches the maximum pressure value of the pressure maintenance. The three-position four-way manual reversing valve is reversed, and the manual oil replenishment is completed. Repeat this process and the oil replenishment cycle continues.

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