Sintering furnace pressure maintaining and pressurizing pump station system

Abstract

The utility model discloses a pressure maintaining and pressurizing pump station system of a sintering furnace. The pressure maintaining and pressurizing pump station system of the sintering furnace comprises an oil supply assembly, an overflow valve safety valve group, a reversing valve control valve group, an energy accumulator and pressure gauge assembly and an electric cabinet assembly. The overflow valve safety valve group 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 the 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 utility model relates to the technical field of hydraulic system pressure maintaining and boosting, in particular to a pressure maintaining and boosting pumping station system for a sintering furnace. Background Technique

[0002] Sintering is a process of compacting materials by heating or pressure to form a solid block, but not melting them to the liquefaction point. A sintering furnace is a special equipment that enables powder compacts to obtain the required physical and mechanical properties and microstructures through sintering. The sintering furnace is used to dry the slurry on the silicon wafer, remove the organic components in the slurry, and complete the sintering of the aluminum back field and grid lines.

[0003] In order to ensure the smooth progress of dewaxing (lubricant or forming agent), reduction, alloying, and microstructure transformation of powder compacts during sintering, it is necessary to precisely control the sintering temperature, protective atmosphere, compact transfer method, heating and cooling rates, etc. The precisely controlled system is a hydraulic system for a pressure maintaining and boosting pumping station of a sintering furnace automatically controlled by a remote PLC programmable controller.

[0004] The existing hydraulic systems for pressure maintaining and boosting pumping stations of sintering furnaces still have various deficiencies in actual work, such as a narrow pressure maintaining and boosting range, low pressure maintaining accuracy, inability to achieve simultaneous operation of multiple branches, and inability to stop pressure relief at any time for any branch without affecting the working states of other branches. Content of the Utility Model

[0005] The purpose of the utility model is to provide a pressure maintaining and boosting pumping station system for a sintering furnace to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution:

[0007] A pressure maintaining and boosting pumping station system for a sintering furnace includes an oil supply assembly, an overflow valve and safety valve group, a directional valve and control valve group, an accumulator and a pressure gauge integration, and an electric control box assembly. The overflow valve and safety valve group includes an overflow valve and safety valve block body, a first check valve, a second check valve, a pressure measuring joint, a pressure sensor, an overflow valve, a double shut-off solenoid valve, and a proportional overflow valve. The first check valve is arranged in the oil circuit of the manual pump, the second check valve is arranged in the main oil circuit, and the double shut-off solenoid valve and the proportional overflow valve form an electromagnetic proportional overflow oil circuit for proportionally overflowing the hydraulic oil in the system oil circuit back to the hydraulic oil tank. The directional valve and control valve group includes a directional valve and control valve block body and three directional valve and control valve group branches arranged above it. Each directional valve and control valve group branch includes a stacked electro-hydraulic lock, a three-position four-way electromagnetic directional valve, a stacked pilot-operated check valve, a three-position four-way manual directional valve, a pressure sensor, and a pressure measuring joint. The stacked electro-hydraulic lock is composed of a stacked valve block body, a leak-free double shut-off solenoid valve, and a pilot-operated check valve.

[0008] As a further solution of the utility model: it further 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 mainly consists of a base, lifting lugs and an oil sump. One lifting lug is arranged at each of the four corners of the base, and an oil sump is arranged in the middle of the base.

[0009] As a further solution of the utility model: the oil supply assembly is arranged on one side of the oil sump in the base assembly. The oil supply assembly includes a hydraulic oil tank, an oil drain ball valve, a manual ball valve, a manual pump suction filter, a manual oil pump, a cleaning oil port, a liquid level and liquid temperature gauge, a heater, a return oil filter, an electronic temperature and liquid integrated switch, an air filter, a gear pump vertical motor set, a main pump 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 side plate of the hydraulic oil tank, a manual pump suction filter is arranged at the front end of the manual ball valve, the manual pump suction filter is located inside the hydraulic oil tank, a manual oil pump is arranged at the rear end of the manual ball valve, and the three form a manual pump oil circuit; a cleaning oil port is arranged on the right side plate of the hydraulic oil tank, a liquid level and liquid temperature gauge is arranged on the left side plate of the hydraulic oil tank, a heater is arranged on the left side plate of the hydraulic oil tank, a return oil filter, an electronic temperature and liquid integrated switch and an air filter are arranged on the top plate of the hydraulic oil tank, a gear pump vertical motor set is arranged on the top plate of the hydraulic oil tank, the gear pump vertical motor set consists of a motor, a bell cover, a coupling and a gear pump, the motor is located outside the hydraulic oil tank, while the bell cover, the coupling and the gear pump are located inside the hydraulic oil tank, the suction port of the gear pump is connected to the main pump suction filter, the pressure oil port of the gear pump vertical motor set is connected to the high-pressure filter, the main pump 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 plate of the hydraulic oil tank.

[0010] As a further solution of the utility model: the accumulator and the pressure gauge are integrally arranged on the front side plate of the hydraulic oil tank. The integration of the accumulator and the pressure gauge mainly includes 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 gasket, etc. The main system pressure gauge is used to display the system oil circuit pressure at the oil outlets of the gear pump and the manual pump. The first branch pressure gauge, the second branch pressure gauge and the third branch pressure gauge are respectively used to display the pressure in the rodless cavity of the cylinders in the first branch, the second branch and the third branch. The first branch accumulator, the second branch accumulator and the third branch accumulator are respectively used to display the pressure pulsation absorbed during the pressurization of the rodless cavity of the hydraulic cylinders in the first branch, the second branch and the third branch, 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 the accumulator bracket and fixed by the accumulator clamp. A shock absorber gasket is used between the first branch accumulator, the second branch accumulator, the third branch accumulator and the accumulator bracket to buffer vibration.

[0011] As a still further solution of the utility model: the electric control box assembly is located at a corner of the oil collecting tank of the hydraulic oil tank. 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 for the PLC programmable controller, the indicator light and the knob. The PLC programmable controller, the indicator light and the knob are directly installed on or inside the electric control box body.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. The overflow valve and safety valve group of the utility model adopts a double - cut - off solenoid valve and a proportional overflow valve, and the accuracy of the proportional overflow valve reaches one - thousandth, which improves the pressure - holding accuracy of the hydraulic cylinder and makes the work more reliable;

[0014] 2. Any one of the three branches of the hydraulic pressure - holding and pressurizing system of the utility model can be stopped at any time to achieve pressure relief, cylinder retraction, and restart and automatically adjust to the set value, and the working states of other branches are not affected;

[0015] 3. The hydraulic oil tank of the utility model 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, with higher economic benefits;

[0016] 4. The hydraulic pressure maintaining and boosting system of the three branches of the present utility model can either adopt a PLC programmable controller to control motors, solenoid valves, etc. for automatic boosting, or use a manual pump to pump oil to supply the manual reversing valve for boosting, which adds a double insurance to the hydraulic pressure maintaining and boosting system of the present utility model and improves the safety of the equipment;

[0017] 5. The hydraulic pressure maintaining and boosting system of the three branches of the present utility model uses an accumulator for pressure maintaining. The accumulator can not only absorb the pulsation of the hydraulic oil during boosting, but also serve 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 utility model more stable and reliable and improving the safety of the equipment;

[0018] 6. The hydraulic pressure maintaining and boosting system of the three branches of the present utility model is automatically controlled by a PLC programmable controller, making the hydraulic pressure maintaining and boosting system of the present utility model more automated and intelligent;

[0019] The hydraulic system of the pressure maintaining and pressurizing pumping station of the sintering furnace of the present utility model is more automated and intelligent, operates more smoothly, is safer and more reliable, and has higher economic practical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Stereogram of the pressure maintaining and pressurizing pumping station system of the sintering furnace of the present utility model;

[0021] Figure 2 Stereogram of the overall base of the present utility model;

[0022] Figure 3 Stereogram of the overall oil supply of the present utility model Figure 1 ;

[0023] Figure 4 Stereogram of the overall oil supply of the present utility model Figure 2 ;

[0024] Figure 5 Stereogram of the overflow valve and safety valve group of the present utility model

[0025] Figure 6 Stereogram of the reversing valve control valve group of the present utility model Figure 1 ;

[0026] Figure 7 Stereogram of the reversing valve control valve group of the present utility model Figure 2 ;

[0027] Figure 8 Stereogram of the stacked electro-hydraulic lock of the reversing valve control valve group of the present utility model;

[0028] Figure 9 Stereogram of the integrated accumulator and pressure gauge of the present utility model;

[0029] Figure 10 is the three-dimensional view of the overall assembly of the electric control box of the present utility model;

[0030] Figure 11 is the schematic diagram of the pressure-holding and pressure-pumping station system of the sintering furnace of the present utility model;

[0031] In the figure: 1 - base assembly, 2 - oil supply assembly, 3 - overflow valve and safety valve group, 4 - directional valve and control valve group, 5 - accumulator and pressure gauge integration, 6 - electric control box assembly

[0032] Base, 1.2 - lifting lug, 1.3 - oil collecting tank, 2.1 - hydraulic oil tank, 2.2 - oil drain ball valve, 2.3 - manual ball valve, 2.4 - manual pump suction filter, 2.5 - manual oil pump, 2.6 - cleaning oil 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 suction filter, 2.14 - high - pressure filter, 2.15 - motor, 2.16 - bell cover, 2.17 - coupling, 2.18 - gear pump, 3.1 - overflow valve and safety valve block, 3.2 - first check valve, 3.3 - second check valve, 3.4 - overflow valve pressure measuring joint, 3.5 - overflow valve pressure sensor, 3.6 - overflow valve, 3.7 - double - block solenoid valve, 3.8 - proportional overflow valve, 4.1 - directional valve control block, 4.2 - first - branch stacked electro - hydraulic lock, 4.3 - second - branch stacked electro - hydraulic lock, 4.4 - third - branch stacked electro - hydraulic lock, 4.5 - first - branch three - position four - way solenoid directional valve, 4.6 - second - branch three - position four - way solenoid directional valve, 4.7 - third - branch three - position four - way solenoid directional valve, 4.8 - first - branch stacked pilot - operated check valve, 4.9 - second - branch stacked pilot - operated check valve, 4.10 - third - branch stacked pilot - operated check valve, 4.11 - first - branch three - position four - way manual directional valve, 4.12 - second - branch three - position four - way manual directional valve, 4.13 - third - branch three - position four - way manual directional valve, 4.14 - first - branch directional valve pressure sensor, 4.15 - second - branch directional valve pressure sensor, 4.16 - third - branch directional valve pressure sensor, 4.17 - first - branch directional valve pressure measuring joint, 4.18 - second - branch directional valve pressure measuring joint, 4.19 - third - branch directional valve pressure measuring joint, 4.20 - stacked valve block, 4.21 - leak - free double - block solenoid valve, 4.22 - pilot - operated check 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 gasket, 6.1 - electric control box, 6.2 - PLC programmable controller, 6.3 - indicator lights and knobs. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0034] Please refer to Figure 1-11 , the present utility model provides a technical solution: a sintering furnace pressure-holding and pressure-pumping station system, which includes a base assembly 1, an oil supply assembly 2, an overflow valve and safety valve group 3, a directional valve and control valve group 4, an accumulator and pressure gauge integration 5, and an electric control box assembly 6.

[0035] Specifically, please refer to Figure 1 , Figure 2 and Figure 11 , the base assembly 1 is the carrier of the hydraulic system of the sintering furnace pressure-holding and pressure-pumping station of the present utility model, and other assemblies are directly or indirectly fixed on the base assembly 1. The base assembly 1 is mainly composed of a base 1.1, lifting lugs 1.2, and an oil sump 1.3. The base 1.1 is the foundation of the base assembly 1; there is a lifting lug 1.2 at each of the four corners of the base 1.1, and its function is to facilitate hoisting; an oil sump 1.3 is arranged in the middle of the base 1.1, and the main function of the oil sump 1.3 is to collect and store the leaked hydraulic oil to prevent the hydraulic oil from directly dripping onto the ground and polluting the environment.

[0036] Specifically, please refer to Figure 1 , Figure 3 , Figure 4 and Figure 11, the oil supply assembly 2 is arranged on one side of the oil collecting tank 1.3 in the base assembly 1. Its function is to provide a hydraulic oil source for the sintering furnace pressure maintaining and pressurizing pump station system, and convert mechanical energy into the pressure energy of the liquid 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 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, a return oil filter 2.9, an electronic temperature and liquid integrated switch 2.10, an air filter 2.11, a gear pump vertical motor set 2.12, a main pump suction filter 2.13, a high-pressure filter 2.14, etc. The hydraulic oil tank 2.1 is the 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; the main functions of the hydraulic oil tank 2.1 include storing oil, dissipating heat, separating bubbles and impurities, providing an installation position, and balancing the system pressure. The oil drain ball valve 2.2 and the manual ball valve 2.3 are arranged at the lower end of the front side panel of the hydraulic oil tank 2.1; the oil drain ball valve 2.2 is the manual switch for draining the hydraulic oil in the hydraulic oil tank 2.1, and its function is to release the hydraulic oil in the hydraulic oil tank 2.1. The manual pump suction filter 2.4 is arranged at the front end of the manual ball valve 2.3, the manual pump suction filter 2.4 is located inside the hydraulic oil tank 2.1, and the 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 function of the manual ball valve 2.3 is the manual switch of the manual pump oil circuit; the function of the manual pump suction filter 2.4 is to roughly filter the hydraulic oil entering the manual pump oil circuit; the function of the manual oil pump 2.5 is to take high-pressure hydraulic oil for the manual pump of the overflow valve safety valve group 3. Pumping hydraulic oil with a manual pump is only used in case of emergency without power. The cleaning oil port 2.6 is arranged in the middle of the right side panel of the hydraulic oil tank 2.1, and its function is to facilitate the cleaning of the inner wall of the hydraulic oil tank 2.1. The liquid level and temperature gauge 2.7 is arranged in the upper middle part of the left side panel 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. The heater 2.8 is arranged in the lower middle part of the left side panel of the hydraulic oil tank 2.1, and its function is to heat the low-temperature hydraulic oil. The return oil filter 2.9, the electronic temperature and liquid integrated switch 2.10 and the air filter 2.11 are arranged on the right side of the top panel 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 system, and the return oil filter 2.9 is equipped with a signal device for alarm when the filter element is blocked. The function of the electronic temperature and 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 function of the air filter 2.11 is to filter out dust and sand particles in the air, ensuring that sufficient and clean air enters the hydraulic oil tank 2.1. A vertical gear pump motor unit 2.12 is provided on the left side of the top plate of the hydraulic oil tank 2.1. The vertical gear pump motor unit 2.12 mainly consists of a motor 2.15, a bell cover 2.16, a coupling 2.17, a gear pump 2.18, etc. The motor 2.15 is located outside the hydraulic oil tank 2.1, while the bell cover 2.16, the coupling 2.17, and the gear pump 2.18 are located inside the hydraulic oil tank 2.1. The suction port of the gear pump 2.18 is connected to the main pump suction filter 2.13, and the pressure oil port of the vertical gear pump motor unit 2.12 is connected to the high-pressure filter 2.14. The main pump 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, at the middle of the top plate of the hydraulic oil tank 2.1. The main pump suction filter 2.13, the gear pump 2.18, and the high-pressure filter 2.14 form the main oil circuit, that is, the motor 2.15 drives the gear pump 2.18 through the bell cover 2.16 and the coupling 2.17 to pump the hydraulic oil that has been roughly filtered by the main pump suction filter 2.13, and provides the high-pressure hydraulic oil that has been finely filtered by the high-pressure filter 2.14 to the overflow valve safety valve group 3.

[0037] Specifically, please refer to Figure 1 、 Figure 5 and Figure 11, the overflow valve and 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. 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 and safety valve group 3 mainly includes an overflow valve and safety valve block 3.1, a first check valve 3.2, a second check valve 3.3, a pressure measuring joint 3.4, a pressure sensor 3.5, an overflow valve 3.6, a double shut-off solenoid valve 3.7, a proportional overflow valve 3.8, etc. The overflow valve and safety valve block 3.1 is both a carrier for other components of the overflow valve and safety valve group 3 and a channel body for connecting other components of the overflow valve and safety valve group 3. The first check 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 to protect the safety of the manual oil pump 2.5; the second check 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 to protect the safety of the gear pump 2.18; the manual pump oil circuit passing through the first check valve 3.2 and the main oil circuit passing through the second check valve 3.3 merge in the overflow valve and safety valve block 3.1 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 check valve 3.3 in the main oil circuit back to the hydraulic oil tank 2.1; the double shut-off solenoid valve 3.7 and the proportional overflow valve 3.8 form an electromagnetic proportional overflow oil circuit, and its function is to proportionally overflow the hydraulic oil in the system oil circuit back to the hydraulic oil tank 2.1; the double shut-off solenoid valve 3.7 is an electric switch of the electromagnetic proportional overflow oil circuit and is directly controlled by the PLC programmable controller 6.2.

[0038] Specifically, please refer to Figure 1 , Figure 6 , Figure 7 , Figure 8 and Figure 11, the directional valve control valve group 4 is arranged in the oil collecting tank 1.3 of the bottom plate assembly 1, in the middle of the front side of the hydraulic oil tank 2.1, and its function is to control the direction change of the hydraulic cylinder of the final actuator. The directional valve control valve group 4 mainly includes a directional valve control valve block 4.1, a first branch superimposed electro-hydraulic lock 4.2, a second branch superimposed electro-hydraulic lock 4.3, a third branch superimposed electro-hydraulic lock 4.4, a first branch three-position four-way electromagnetic directional valve 4.5, a second branch three-position four-way electromagnetic directional valve 4.6, a third branch three-position four-way electromagnetic directional valve 4.7, a first branch superimposed pilot-operated check valve 4.8, a second branch superimposed pilot-operated check valve 4.9, a third branch superimposed pilot-operated check valve 4.10, a first branch three-position four-way manual directional valve 4.11, a second branch three-position four-way manual directional valve 4.12, a third branch three-position four-way manual directional valve 4.13, a first branch pressure sensor 4.14, a second branch pressure sensor 4.15, a third branch pressure sensor 4.16, a first branch pressure measuring joint 4.17, a second branch pressure measuring joint 4.18, and a third branch pressure measuring joint 4.19, etc. The valves and pressure measuring devices used in the three branches are exactly the same. The directional valve control valve block 4.1 is both a carrier for other components of the directional valve control valve group 4 and a channel body for connecting other components of the directional valve control valve group 4.The first-branch superimposed electro-hydraulic lock 4.2, the second-branch superimposed electro-hydraulic lock 4.3, and the third-branch superimposed electro-hydraulic lock 4.4 are respectively used for electrically controlling the pressure holding of three branches; the first-branch superimposed electro-hydraulic lock 4.2, the second-branch superimposed electro-hydraulic lock 4.3, and the third-branch superimposed electro-hydraulic lock 4.4 are all composed of a superimposed valve block 4.20, a leak-free double-check solenoid valve 4.21, and a pilot-operated check valve 4.22; the superimposed valve block 4.20 is both a carrier for the leak-free double-check solenoid valve 4.21 and the pilot-operated check valve 4.22, and also a channel body connecting the double-check solenoid valve 4.21 and the pilot-operated check valve 4.22. The leak-free double-check solenoid valve 4.21 is used for pressure holding of the rodless cavity of the oil cylinder, and the pilot-operated check valve 4.22 is used for pressure holding of the rod chamber of the oil cylinder; the first-branch three-position four-way solenoid directional valve 4.5, the second-branch three-position four-way solenoid directional valve 4.6, and the third-branch three-position four-way solenoid directional valve 4.7 are used for electrically controlling the oil inlet and outlet of three branches respectively; the first-branch superimposed pilot-operated check valve 4.8, the second-branch superimposed pilot-operated check valve 4.9, and the third-branch superimposed pilot-operated check valve 4.10 are respectively used for pressure holding of three branches controlled manually; the first-branch three-position four-way manual directional valve 4.11, the second-branch three-position four-way manual directional valve 4.12, and the third-branch three-position four-way manual directional valve 4.13 are respectively used for manually controlling the oil inlet and outlet of three branches; the first-branch pressure sensor 4.14, the second-branch pressure sensor 4.15, and the third-branch pressure sensor 4.16 respectively transmit pressure signals of three branches to the PLC programmable controller 6.2; 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 on the rodless cavity oil circuits of three branches and are connected to the first-branch pressure gauge 5.2, the second-branch pressure gauge 5.3, and the third-branch pressure gauge 5.4 respectively to respectively display the pressures in three branches in real time.

[0039] Specifically, please refer to Figure 1 , Figure 9 and Figure 11, the accumulator and pressure gauge assembly 5 is arranged in the upper middle part of the front side plate of the hydraulic oil tank 2.1. Its function is to both provide an auxiliary power oil source for maintaining the pressure of the rodless cavities of the hydraulic cylinders in 3 branches of the directional valve control valve group 4 and display the system pressure and the pressure of the rodless cavities that need to maintain pressure in the 3 branches. The accumulator and pressure gauge assembly 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, an accumulator rubber pad 5.10, etc. The main system pressure gauge 5.1 displays the system oil circuit pressure at the oil outlets of the gear pump and the manual pump; 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 pressures of the rodless cavities of the cylinders in 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 respectively absorb the pressure pulsations during the pressurization of the rodless cavities of the hydraulic cylinders in the first branch, the second branch, and the third branch, and serve as auxiliary power sources 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 the accumulator clamp 5.9. A shock-absorbing 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.

[0040] Specifically, please refer to Figure 1 , Figure 10 and Figure 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 centrally place multiple low-voltage switch devices and related control, measurement, signal, protection, regulation, etc. devices in a box for easy searching and maintenance. The electric control box assembly 6 includes 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 for 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 body 6.1. The PLC programmable controller 6.2 can both directly display the key parameters of the hydraulic system of the sintering furnace pressure holding and pressurizing pump station and automatically control the hydraulic system of the sintering furnace pressure holding and pressurizing pump station according to the displayed key parameters. The indicator light and the knob 6.3 can both manually control the hydraulic system of the sintering furnace pressure holding and pressurizing pump station and display the operating state of the hydraulic system of the sintering furnace pressure holding and pressurizing pump station.

[0041] Automatic pressure holding working method of the hydraulic system of the sintering furnace pressure holding and pressurizing pump station:

[0042] 1. Automatically start the motor 2.15. The motor 2.15 drives the gear pump 2.18 to start pumping oil through the coupling 2.17. After the oil fills the main oil path connecting the gear pump 2.18 and the second one-way valve 3.2, the pressure of the hydraulic oil increases. When the pressure of the hydraulic oil equals 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 path. The main system pressure gauge 5.1 and the display screen of the PLC programmable controller 6.2 display the main system pressure.

[0043] 2. As the hydraulic oil continuously enters the main system, after the main system oil path is filled with the hydraulic oil, 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 solenoid directional valve 4.5 to change its direction and the non-leaking double-check valve 4.21 in the first branch stacked electro-hydraulic lock 4.2 to open, supplying high-pressure hydraulic oil to the rodless cavity 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 outwards, applying pressure to the sintering furnace powder, enabling the powder to be compacted according to the compact shape. When the pressure in the rodless cavity of the first branch hydraulic cylinder reaches the required pressure, the PLC programmable controller 6.2 controls the first branch three-position four-way solenoid directional valve 4.5 to change its direction and the non-leaking double-check valve 4.21 in the first branch stacked electro-hydraulic lock 4.2 to close. The first branch hydraulic system is pressurized and maintained under the action of the first branch stacked electro-hydraulic lock 4.2, the first branch stacked pilot-operated check valve 4.8, and the first branch accumulator 5.5. By performing this operation and pressurizing and maintaining the second branch and the third branch according to the pressure requirements, the PLC programmable controller 6.2 controls the motor 2.15 to stop running. The three branches can be pressurized and maintained at the same pressure or different pressures. When the pressures of the three branches are different, the overflow pressure value of the relief valve 3.6 is adjusted to the maximum value of the pressures of the three branches.

[0044] 3. When the three branches are pressurized and maintained, as the hydraulic oil in the pressurized and maintained branches slowly leaks, the pressures of the three branches slowly decrease. When the PLC programmable controller monitors that the pressure in the rodless cavity of the 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-check 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 supplement the pressure for this branch. At the same time, the three-position four-way solenoid directional valve of this branch changes its direction and the double-check valve opens, supplying high-pressure hydraulic oil to this branch until it reaches the maximum pressure value of this branch, that is, the three-position four-way solenoid directional valve changes its direction and the double-check valve opens, and the oil replenishment is completed. And so on, for cyclic oil replenishment.

[0045] Manual pressure maintenance working method for the hydraulic system of the sintering furnace pressure maintenance and pressurization pumping station in an emergency state without power:

[0046] 1. Open the manual ball valve 2.3, put the operating rod into the oil pumping operation hole of the manual oil pump 2.5, continuously 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, and the hydraulic oil enters the system oil circuit, and the main system pressure gauge 5.1 shows the system pressure.

[0047] 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 to fill the rodless cavity of the cylinder of this branch with hydraulic oil, and the branch pressure gauge shows the pressure of this branch. When the pressure shown on the branch pressure gauge reaches the maximum value of the branch pressure, the three-position four-way manual reversing valve changes direction, and this branch is maintained under pressure by the action of the branch stacking type hydraulic control check valve, the stacking type electro-hydraulic lock and the accumulator. And so on, put other branches in the pressure maintenance state.

[0048] 3. Observe the readings of the first branch pressure gauge 5.2, the second branch pressure gauge 5.3, and the third branch pressure gauge 5.4. Whichever branch has a pressure value reaching the minimum value of the pressure maintenance of this branch, while the manual oil pump 2.5 is pumping oil, start to open the three-position four-way manual reversing valve of this branch to supplement the high-pressure hydraulic oil pumped by the manual oil pump 2.5 to this branch until the pressure of this branch reaches the maximum pressure value of the pressure maintenance. The three-position four-way manual reversing valve changes direction, and the manual oil replenishment is completed. And so on, cycle the oil replenishment.

[0049] Note: When one of the branches is supplemented with high-pressure hydraulic oil, if it is detected that other branches also have a demand for oil replenishment, after the oil replenishment of the branch being replenished is completed, then deal with the oil replenishment requirements of other branches.

[0050] Working principle: The working principle of the hydraulic system is mainly based on Pascal's law, which is a hydrostatics principle indicating that in a closed liquid, pressure is uniformly transmitted from one point to other points.

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sintering furnace pressure-holding and pressure-pumping station system, characterized in that, It includes an oil supply assembly (2), an overflow valve and safety valve group (3), a directional valve and control valve group (4), an accumulator and pressure gauge integration (5), and an electric control box assembly (6). The overflow valve and safety valve group (3) includes an overflow valve and safety valve block (3.1), a first one-way valve (3.2), a second one-way valve (3.3), an overflow valve pressure measuring joint (3.4), an overflow valve pressure sensor (3.5), an overflow valve (3.6), a double shut-off solenoid valve (3.7), and a proportional overflow valve (3.8). The first one-way valve (3.2) is arranged in the oil circuit of the manual pump. The second one-way valve (3.3) is arranged in the main oil circuit. The double shut-off solenoid valve (3.7) and the proportional overflow valve (3.8) form an electromagnetic proportional overflow oil circuit for proportionally overflowing the hydraulic oil in the system oil circuit back to the hydraulic oil tank (2.1). The directional valve and control valve group (4) includes a directional valve and control valve block (4.1) and three branches of the directional valve and control valve group arranged above it. Each branch of the directional valve and control valve group includes a stacked electro-hydraulic lock, a three-position four-way solenoid directional valve, a stacked pilot-operated one-way valve, a three-position four-way manual directional valve, a directional valve pressure sensor, and a directional valve pressure measuring joint. The stacked electro-hydraulic lock is composed of a stacked valve block (4.20), a leak-free double shut-off solenoid valve (4.21), and a pilot-operated one-way valve (4.22).

2. The pressure-holding and pressure-pumping station system of a sintering furnace according to claim 1, characterized in that It also includes a base assembly (1). The base assembly (1) is the carrier of the hydraulic system, and other assemblies are directly or indirectly fixed on the base assembly (1). The base assembly (1) mainly consists of a base (1.1), lifting lugs (1.2), and an oil sump (1.3). There is a lifting lug (1.2) at each of the four corners of the base (1.1), and an oil sump (1.3) is arranged in the middle of the base (1.1).

3. The pressure-holding and pressure-pumping station system of a sintering furnace according to claim 2, wherein, The fuel supply assembly (2) is arranged on one side of the oil sump (1.3) in the base assembly (1). The fuel supply assembly (2) includes a hydraulic oil tank (2.1), an oil drain ball valve (2.2), a manual ball valve (2.3), a manual pump 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), a return oil filter (2.9), an electronic temperature and liquid integrated switch (2.10), an air filter (2.11), a gear pump vertical motor set (2.12), a main pump suction filter (2.13), and a high-pressure filter (2.14). The hydraulic oil tank (2.1) is the carrier of the fuel supply assembly (2), and other hydraulic components of the fuel supply assembly (2) are directly or indirectly arranged on the hydraulic oil tank (2.1). At the lower end of the front side panel of the hydraulic oil tank (2.1), there are arranged the oil drain ball valve (2.2) and the manual ball valve (2.3). At the front end of the manual ball valve (2.3), there is arranged the manual pump suction filter (2.4), and the manual pump suction filter (2.4) is located inside the hydraulic oil tank (2.1). At the rear end of the manual ball valve (2.3), there is arranged the manual oil pump (2.5), and the three form a manual pump oil circuit. On the right side panel of the hydraulic oil tank (2.1), there is arranged the cleaning oil port (2.6). On the left side panel of the hydraulic oil tank (2.1), there is arranged the liquid level and temperature gauge (2.7). On the left side panel of the hydraulic oil tank (2.1), there is arranged the heater (2.8). On the top panel of the hydraulic oil tank (2.1), there are arranged the return oil filter (2.9), the electronic temperature and liquid integrated switch (2.10), and the air filter (2.11). On the top panel of the hydraulic oil tank (2.1), there is arranged the gear pump vertical motor set (2.12). The gear pump vertical motor set (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 suction port of the gear pump (2.18) is connected to the main pump suction filter (2.13). The pressure oil port of the gear pump vertical motor set (2.12) is connected to the high-pressure filter (2.14). The main pump suction filter (2.13) is located below the liquid level inside the hydraulic oil tank (2.1). The high-pressure filter (2.14) is located outside the hydraulic oil tank (2.1), at the middle of the top panel of the hydraulic oil tank (2.1).

4. A pressure-holding and pressurizing pumping station system for a sintering furnace according to claim 3, characterized in that, The accumulator and pressure gauge assembly (5) is arranged on the front side panel of the hydraulic oil tank (2.1). The accumulator and pressure gauge assembly (5) 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 gasket (5.10). The main system pressure gauge (5.1) is used to display the system oil circuit pressure at the oil outlets of the gear pump and the manual pump. The first branch pressure gauge (5.2), the second branch pressure gauge (5.3) and the third branch pressure gauge (5.4) are respectively used to display the pressures in the rodless chambers of the cylinders in 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 absorb the pressure pulsations during the pressurization of the rodless chambers of the hydraulic cylinders in the first branch, the second branch and the third branch, and serve as auxiliary power sources 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 the accumulator clamp (5.9). A shock absorber gasket (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 vibrations.

5. A pressure-holding and pressurizing pumping station system for a sintering furnace according to claim 4, characterized in that, The electric control box assembly (6) is located at a corner of the oil sump (1.3) of the hydraulic oil tank (2.1). The electric control box assembly (6) includes 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 for 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 body (6.1).

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