CN112324759A - Shield machine oil tank water cooling system and shield machine oil tank water cooling control method - Google Patents
Shield machine oil tank water cooling system and shield machine oil tank water cooling control method Download PDFInfo
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- CN112324759A CN112324759A CN202011307770.2A CN202011307770A CN112324759A CN 112324759 A CN112324759 A CN 112324759A CN 202011307770 A CN202011307770 A CN 202011307770A CN 112324759 A CN112324759 A CN 112324759A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
Abstract
A water cooling system of a shield machine oil tank and a water cooling control method of the shield machine oil tank comprise an oil tank, a variable frequency pump, a high-pressure filter, an oil pipe, a cooling unit and a PLC (programmable logic controller); a fifth temperature sensor is arranged in the oil tank; the oil pipe is provided with a first flow sensor and comprises a first oil inlet section and a first oil outlet section; the cooling unit comprises a first heat exchanger, a first water inlet pipe, a first water outlet pipe, a proportional flow valve and a second flow sensor; the oil tank, the variable frequency pump, the high-pressure filter and the first heat exchanger are sequentially communicated through oil pipes, and the tail ends of the oil pipes are connected into the oil tank; the first water inlet pipe, the first heat exchanger and the first water outlet pipe are connected in sequence; the first water inlet pipe is provided with a proportional flow valve and a second flow sensor, and the proportional flow valve is arranged at the front end part of the first water inlet pipe; the variable frequency pump, the proportional flow valve, the first flow sensor, the second flow sensor and the fifth temperature sensor are respectively connected with the PLC. The invention can accurately control the temperature of the oil.
Description
Technical Field
The invention relates to the field of shield machine oil tanks, in particular to a shield machine oil tank water cooling system and a shield machine oil tank water cooling control method.
Background
Most working mechanisms of the shield tunneling machine are mainly driven by a hydraulic system, such as a shield tunneling machine hydraulic propelling and hinging system, a cutter head driving system, a segment assembling system, an auxiliary hydraulic system, a spiral conveying system, a hydraulic oil main oil tank, a cooling and filtering system and the like, wherein the hydraulic system can be the heart of the shield tunneling machine and plays a vital role in the tunneling of the shield tunneling machine. Whether the hydraulic system is normal or not is directly related to the working efficiency of the shield. With the increasing demand of underground space, the construction environment is more and more complex, the technology of underground space is more and more advanced, and the requirements on various systems of the shield tunneling machine are higher and higher, wherein the requirements comprise an oil temperature cooling system.
In the process of converting pressure energy and mechanical energy of a hydraulic system, most of power loss is converted into heat, so that the oil temperature is increased. The oil temperature of the hydraulic system is generally not suitable to exceed 55 ℃, and when the temperature exceeds 60 ℃, the hydraulic system is easy to appear: the oil temperature is too high, so that the hydraulic oil is aged in an accelerated manner, the viscosity and the volumetric efficiency are reduced, the leakage is increased, the efficiency of a hydraulic system is reduced, and even mechanical equipment cannot work normally. Experiments show that when the temperature of hydraulic oil exceeds 55 ℃, the oxidation of the hydraulic oil is intensified, and after the temperature of the hydraulic oil exceeds 55 ℃, the service life of the hydraulic oil is shortened by half when the temperature rises by about 10 ℃; the oil is vaporized due to over-high temperature, water is evaporated, and the oxidation of the oil is accelerated. The oil is oxidized to form colloidal sediment which is easy to block system elements, and meanwhile, corrosive acid generated by oxidation is used for cavitation corrosion damage of all hydraulic elements, so that the hydraulic system cannot work normally; parts of a hydraulic system expand when heated, so that the original normal fit clearance of the parts is damaged, the friction resistance is increased, the action failure of a moving part is caused, and particularly a hydraulic valve is easy to block; the aging and deterioration of the rubber sealing element are accelerated, the service life is shortened, and even the sealing performance is lost, so that the hydraulic system is seriously leaked.
When the oil temperature of the hydraulic system rises to a large extent and the oil temperature rises too fast, the performance of hydraulic oil is seriously affected, the service life of a hydraulic element is shortened, the normal use of equipment is damaged, and the maintenance cost of the equipment is increased. Because the shield machine oil temperature upper limit is interlocked, when the oil temperature rises to the set limit, the shield machine is forced to stop running and wait for the oil temperature to drop, and the engineering tunneling progress is influenced, so the shield machine hydraulic oil temperature cannot be too high, when the hydraulic oil temperature is more than or equal to 50 ℃, the alarm is given, when the hydraulic oil temperature is more than 65 ℃, the machine is stopped, and the temperature rise in the continuous operation working condition is ensured to be not more than 60 ℃. The existing shield machine oil tank water cooling system cannot stably control the oil temperature of an oil tank within a set range, and the control precision and stability need to be further improved; the water cooling mode is single, and under the condition of an abnormal working condition, when the temperature rise of the oil tank is too fast and reaches a set limit, the shield machine is forced to stop running, and the shield machine is manually restarted after the oil temperature is reduced, so that the engineering tunneling progress is influenced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, the invention aims to provide the shield machine oil tank water cooling system which is high in control precision and stability and can enable the temperature rise and the cooling water flow to be in dynamic balance to a certain degree.
The invention also provides a water cooling control method for the oil tank of the shield machine.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a shield machine oil tank water cooling system, including an oil tank, a variable frequency pump, a high pressure filter, an oil pipe, a cooling unit, and a PLC controller; a fifth temperature sensor is arranged in the oil tank; the oil pipe is provided with a first flow sensor and comprises a first oil inlet section and a first oil outlet section; the cooling unit comprises a first heat exchanger, a first water inlet pipe, a first water outlet pipe, a proportional flow valve and a second flow sensor; the oil tank, the variable frequency pump, the high-pressure filter and the first heat exchanger are sequentially communicated through oil pipes, and the tail ends of the oil pipes are connected into the oil tank; the first water inlet pipe, the first heat exchanger and the first water outlet pipe are connected in sequence; the first water inlet pipe is provided with a proportional flow valve and a second flow sensor, and the proportional flow valve is arranged at the front end part of the first water inlet pipe; the variable frequency pump, the proportional flow valve, the first flow sensor, the second flow sensor and the fifth temperature sensor are respectively connected with the PLC.
Based on the design, oil enters the cooling unit, the third flow sensor monitors the flow of the circulating oil circuit in real time to prevent the circulating oil circuit from being blocked, the fifth temperature sensor monitors the temperature of the oil in the oil tank in real time, the two-way plug-in type proportional flow valve accurately controls the flow of the entering cooling water to control the heat exchange rate, so that the temperature of the oil is accurately controlled, the oil temperature and the cooling water flow are in a stable state of dynamic balance, and the oil temperature is accurately controlled.
In addition, the shield machine oil tank water cooling system provided by the embodiment of the invention can also have the following additional technical characteristics:
the first oil inlet section is provided with a first pressure gauge, a first thermometer and a first butterfly valve; a third temperature sensor, a second pressure gauge and a second butterfly valve are arranged on the first oil outlet section; and the third temperature sensor is connected with the PLC.
The first water inlet pipe is also provided with a third pressure gauge and a first temperature sensor; a fourth pressure gauge and a second thermometer are arranged on the first water outlet pipe; the first temperature sensor is connected with the PLC.
The cooling mechanism comprises a second heat exchanger, a second water inlet pipe and a second water outlet pipe; the oil pipe also comprises a second oil inlet section and a second oil outlet section, and the high-pressure filter, the second oil inlet section, the second heat exchanger, the second oil outlet section and the first oil inlet section are communicated in sequence; the second water inlet pipe, the second heat exchanger and the second water outlet pipe are connected in sequence; a third flow sensor is arranged on the second water inlet pipe; and the third flow sensor is connected with the PLC. After the oil in the oil tank is pumped out through the variable frequency pump, the pollution source is removed through the high-pressure filter, the oil liquid in the cooling mechanism is subjected to heat exchange with cooling water at the second heat exchanger for primary cooling, and the oil liquid is subjected to primary cooling through the cooling mechanism and then enters the cooling unit to perform accurate temperature control on the oil liquid better.
A third thermometer, a fifth pressure gauge and a third butterfly valve are further arranged on the second oil inlet section; a third temperature sensor, a sixth pressure gauge and a fourth butterfly valve are arranged on the second oil outlet section; and the third temperature sensor is connected with the PLC.
A fourth temperature sensor, a seventh pressure gauge and a fifth butterfly valve are further arranged on the second water inlet pipe; a fourth thermometer, an eighth pressure gauge and a sixth butterfly valve are arranged on the second water outlet pipe; and the fourth temperature sensor is connected with the PLC.
Still be equipped with liquid level switch group in the oil tank, liquid level switch group includes from last high liquid level switch, low liquid level switch and the liquid level switch that stops that sets up extremely down, high liquid level switch, low liquid level switch and the liquid level switch that stops are connected with the PLC controller respectively. The high liquid level switch, the low liquid level switch and the shutdown liquid level switch are used for monitoring the liquid level in the oil tank in real time respectively.
The proportional flow valve is a two-way plug-in type proportional flow water valve; the first heat exchanger and the second heat exchanger are plate heat exchangers.
In order to achieve the above purpose, a second aspect of the present invention provides a water cooling control method for a shield machine oil tank, which uses the water cooling system for the shield machine oil tank to perform operations, sets parameters on a PLC controller, and divides an oil temperature regulation and control interval critical value t5、t4、t3、t2And t1And t is5>t4>t3>t2>t1(ii) a Oil in the oil tank is pumped out by the variable frequency pump, a pollution source is removed by filtering through the high-pressure filter, and the oil liquid exchanges heat with cooling water in the second heat exchanger through the cooling mechanism to finish primary cooling; then the oil liquid enters a cooling unit, a PLC monitors the temperature of the oil liquid in an oil tank through a fifth temperature sensor to control the flow rate of the cooling water entering a proportional flow valve in the cooling unit, and a second flow sensorReal-time monitoring to control heat exchange rate and oil temperature at t2≤t≤t3In the interval, the oil returns to the oil tank 1;
the oil temperature regulation and control method of the oil liquid comprises the following specific steps:
A. when the oil temperature t is more than or equal to t5When the oil temperature reaches the limit value, the PLC controls the shield tunneling machine to stop, so that the oil temperature is reduced, and then the equipment is restarted;
B. when the oil temperature t4≤t≤t5When the oil temperature reaches an alarm value, the variable frequency pump is accelerated, so that the heat exchange rate of the oil liquid and the cooling water is accelerated; meanwhile, the PLC controls a proportional flow valve in the cooling unit to increase the flow of cooling water entering the first water inlet pipe, the second flow sensor monitors the flow of cooling water in real time and reports the flow of cooling water to the PLC, the fifth temperature sensor monitors the oil temperature in the oil tank in real time and preliminarily reduces the oil temperature to a safe interval;
C. the oil is preliminarily cooled by a cooling mechanism, and the oil temperature is preliminarily adjusted to t3≤t≤t4(i.e. t is more than or equal to 36 ℃ and less than or equal to 50 ℃), and the oil enters a cooling unit;
D. the oil temperature is stably at t through the secondary cooling of the cooling unit2≤t≤t3And in intervals, accurate temperature control is achieved.
Based on the design, the temperature rise and the cooling water flow are in dynamic balance to a certain degree through multi-stage combined control.
In addition, the shield machine oil tank water-cooling control method provided by the embodiment of the invention can also have the following additional technical characteristics:
t5＝60℃，t4＝50℃，t3＝36℃，t2＝30℃，t1＝0℃。
drawings
Fig. 1 is a schematic diagram of a shield machine oil tank water cooling system according to a first embodiment of the invention.
Fig. 2 is a schematic diagram of a second embodiment of a water cooling system of a shield machine oil tank according to the invention.
FIG. 3 is a schematic diagram of a stepped oil temperature control region according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example one
Referring to fig. 1, a water cooling system for an oil tank of a shield machine comprises an oil tank 1, a variable frequency pump 2, a high pressure filter 3, an oil pipe 6, a cooling unit 4 and a PLC controller; a first flow sensor 59 is arranged on the oil pipe 6, and the oil pipe 6 comprises a first oil inlet section 61 and a first oil outlet section 62; the cooling unit 4 comprises a first heat exchanger 43, a first water inlet pipe 44, a first water outlet pipe 45, a proportional flow valve 46 and a second flow sensor 47; the oil tank 1, the variable frequency pump 2, the high-pressure filter 3 and the first heat exchanger 43 are sequentially communicated through an oil pipe 6, and the tail end of the oil pipe 6 is connected into the oil tank 1; the first water inlet pipe 44, the first heat exchanger 43 and the first water outlet pipe 45 are connected in sequence; said first heat exchanger 43 is preferably a plate heat exchanger.
Referring to fig. 1 again, a first temperature gauge 49, a first pressure gauge 4a and a first butterfly valve 4b are disposed on the first oil inlet section 61, and a third temperature sensor 40, a second pressure gauge 4c and a second butterfly valve 4d are disposed on the first oil outlet section 62. The high-pressure filter 3 is used for intercepting pollutants in the oil liquid and keeping the oil liquid clean. The third temperature sensor 40 monitors the temperature of the oil liquid in the first oil outlet section 62 after the temperature is accurately controlled in real time and reports the temperature to the PLC. The first pressure gauge 4a monitors the pressure of the oil to be cooled entering the first heat exchanger 43, and the first thermometer 49 monitors the temperature of the oil to be cooled entering the first heat exchanger 43; the third temperature sensor 40 monitors the temperature of the cooling oil from the first heat exchanger 43 and reports the temperature to the PLC, and the second pressure gauge 4c monitors the pressure of the cooling oil from the first heat exchanger 43; the first butterfly valve 4b and the second butterfly valve 4d control the on-off of the circulating oil path. A proportional flow valve 46, a second flow sensor 47, a first temperature sensor 48 and a third pressure gauge 4e are arranged on the first water inlet pipe 44, and the proportional flow valve 46 is arranged at the front end part of the first water inlet pipe 44; the proportional flow valve 46 is preferably a two-way cartridge proportional flow valve that allows for precise control of the flow of cooling water into the first inlet conduit 44; the second flow sensor 47 and the first temperature sensor 48 respectively monitor the flow and the temperature of the cooling water entering the first water inlet pipe 44 in real time and report the flow and the temperature to the PLC controller; the third pressure gauge 4e mainly monitors the pressure of the cooling water entering the first heat exchanger 43. And a fourth pressure gauge 4f and a second thermometer 4g are arranged on the first water outlet pipe 45. The second thermometer 4g monitors the temperature of the cooling water coming out of the first heat exchanger 43; the fourth pressure gauge 4f monitors the pressure of the cooling water coming out of the first heat exchanger 43;
referring to fig. 1 again, a fifth temperature sensor 7 and a liquid level switch group 8 are arranged in the oil tank 1, and the liquid level switch group 8 includes a high liquid level switch 81, a low liquid level switch 82 and a shutdown liquid level switch 83 which are arranged from top to bottom;
the variable frequency pump 2, the proportional flow valve 46, the second flow sensor 47, the first temperature sensor 48, the third temperature sensor 40, the fifth temperature sensor 7, the high liquid level switch 81, the low liquid level switch 82 and the shutdown liquid level switch 83 are respectively connected with a PLC controller. The fifth temperature sensor 7 monitors the temperature of oil in the oil tank 1 in real time, the high liquid level switch 81, the low liquid level switch 82 and the shutdown liquid level switch 83 monitor the liquid level in the oil tank 1 in real time respectively, and when the temperature of the oil in the oil tank 1 reaches the shutdown limit temperature or the liquid level in the oil tank 1 reaches the shutdown liquid level, the PLC controller controls the equipment to shut down; when the oil temperature reaches an alarm value, the PLC controller can alarm, the system can respond quickly, and the oil liquid is cooled quickly. The high liquid level switch 81 is used for detecting whether the oil tank 1 is full, if so, the PLC controller gives an alarm and stops supplying oil; the low level switch 82 is used to detect whether the oil is enough during the operation, and if the oil is not enough, the PLC controller will alarm the oil shortage and control the oil supply (the oil storage tank 9 transfers the oil to the oil tank 1 through the sampling tube 10).
When the invention is applied to work, the variable frequency pump 2 is driven by a motor to suck out oil in the oil tank 1, the oil is firstly filtered by the high-pressure filter 3 to remove pollution sources and then enters the cooling unit 4 to carry out heat exchange with cooling water, the front end part of the first water inlet pipe 44, namely the water inlet of the first water inlet pipe 44, is provided with the two-way plug-in type proportional flow valve 46 to accurately control the flow rate of the entering cooling water so as to control the heat exchange rate, the second flow sensor 47 and the first temperature sensor 48 monitor the flow rate and the temperature of the cooling water in the first water inlet pipe 44 in real time and report the flow rate and the temperature to the PLC controller, the third temperature sensor 40 on the first oil outlet section 62 monitors the temperature of oil in the first oil outlet section 62 in real time and reports the temperature to the PLC controller, the cooled oil finally returns to the oil tank 1, the fifth temperature sensor 7 monitors the temperature of the oil in the oil tank 1 in real time, the flow rate of cooling water entering the two-way plug-in type proportional flow valve 46 is controlled, the temperature of the oil liquid is controlled by monitoring in real time by the second flow sensor 47, and the oil temperature and the flow rate of the cooling water are in a stable state of dynamic balance after being cooled by the cooling unit 4, so that the accurate temperature control is achieved.
Example two
The difference between the present part and the first embodiment is that:
referring to fig. 2 again, the oil pipe (6) further includes a second oil inlet section (63) and a second oil outlet section (64), the shield machine oil tank water cooling system further includes a cooling mechanism 5, and the cooling mechanism 5 is located between the cooling unit 4 and the high-pressure filter 3; the cooling mechanism 5 comprises a second heat exchanger 53, a second water inlet pipe 54 and a second water outlet pipe 55, and the high-pressure filter 3, a second oil inlet section 63, the second heat exchanger 53, a second oil outlet section 64 and the first oil inlet section 61 are communicated in sequence; the second water inlet pipe 54, the second heat exchanger 53 and the second water outlet pipe 55 are connected in sequence; the second heat exchanger 53 is a plate heat exchanger. The second oil inlet section 63 is provided with a third thermometer 56, the first flow sensor 59, a fifth pressure gauge 50 and a third butterfly valve 5 a; the first flow sensor 59 monitors the oil flow in the second oil inlet section 63 in real time and reports the oil flow to the PLC. The second oil outlet section 64 is provided with a third temperature sensor 57, a sixth pressure gauge 5b and a fourth butterfly valve 5 c; the first flow sensor 59 monitors the flow of the oil to be cooled entering the second heat exchanger 53 and reports the monitored flow to the PLC, and when the circulating oil path is not opened or is blocked, the first flow sensor 59 sends a signal to the PLC to give an alarm. A fifth pressure gauge 50 and a third temperature gauge 56 respectively monitor the pressure and the temperature of the oil to be cooled entering the second heat exchanger 53; the third temperature sensor 57 and the sixth pressure gauge 5b respectively monitor the temperature and the pressure of the oil to be cooled coming out of the second heat exchanger 53 and report the temperature and the pressure to the PLC controller; the third butterfly valve 5a and the fourth butterfly valve 5c respectively control the on-off of the second oil inlet section 63 and the second oil outlet section 64. The second water inlet pipe 54 is provided with a third flow sensor 58, a fourth temperature sensor 5d, a seventh pressure gauge 5e and a fifth butterfly valve 5 f; the first flow sensor 59, the third temperature sensor 57, the third flow sensor 58 and the fourth temperature sensor 5d are respectively connected with a PLC controller. The third flow sensor 58 and the fourth temperature sensor 5d monitor the flow and temperature of the cooling water entering in real time and report the flow and temperature to the PLC. A fourth thermometer 5g, an eighth pressure gauge 5h and a sixth butterfly valve 5j are arranged on the second water outlet pipe 55; the seventh pressure gauge 5e monitors the pressure of the cooling water entering the second heat exchanger 53; the fourth temperature sensor 5d monitors the temperature of the cooling water entering the second heat exchanger 53 and reports the temperature to the PLC; the third thermometer 56 and the eighth pressure gauge 5h respectively monitor the temperature and the pressure of the cooling water coming out of the second heat exchanger 53; the fifth butterfly valve 5f and the sixth butterfly valve 5j control the opening and closing of the cooling water pipeline.
Referring to fig. 2 again, when the present invention is applied to work, the variable frequency pump 2 sucks out oil in the oil tank 1, the oil is filtered by the high pressure filter 3 to remove a pollution source, the oil is subjected to heat exchange with cooling water in the second heat exchanger 53 through the cooling mechanism 5 to perform primary cooling, and the temperature of the oil after the primary cooling is monitored in real time by the third temperature sensor 57 on the second oil outlet section 64 and reported to the PLC controller. The oil enters the cooling unit 4 after being preliminarily cooled and finally returns into the oil tank 1, the PLC controls the flow rate of the cooling water entering the two-way plug-in type proportional flow valve 46 through the oil temperature monitored by the temperature sensor 7 in the oil tank 1, the heat exchange rate is controlled through the real-time monitoring of the second flow sensor 47, and the oil is subjected to accurate temperature control. The oil is primarily cooled by the cooling mechanism 5, the oil temperature is not stable, and the oil temperature and the cooling water flow are in a stable state of dynamic balance through secondary cooling of the cooling unit 4, so that accurate temperature control is achieved.
Referring to fig. 2-3 again, fig. 3 is a schematic diagram of an oil temperature step-by-step control area, a shield machine oil tank water-cooling control method, which uses a shield machine oil tank water-cooling system to operate, sets parameters on a PLC controller, and divides an oil temperature control interval critical value t5、t4、t3、t2And t1And t is5>t4>t3>t2>t1Wherein, t5＝60℃，t4＝50℃，t3＝36℃，t2＝30℃，t1The temperature is equal to 0 ℃; oil in the oil tank (1) is pumped out by the variable frequency pump (2), a pollution source is removed by filtering through the high-pressure filter (3), and the oil liquid is subjected to heat exchange with cooling water in the second heat exchanger (53) through the cooling mechanism (5) to finish primary cooling; then the oil liquid enters a cooling unit (4), a PLC monitors the temperature of the oil liquid in an oil tank (1) through a fifth temperature sensor (7) to control the flow rate of the cooling water entering a proportional flow valve (46) in the cooling unit (4), a second flow sensor (47) monitors in real time to control the heat exchange rate, and the oil temperature is controlled at t2≤t≤t3In the interval, the oil returns to the oil tank 1; the oil temperature regulation and control method of the oil liquid comprises the following specific steps:
A. when the oil temperature t is more than or equal to t5When the temperature of the oil reaches a limit value (namely t is more than or equal to 60 ℃), if the temperature of the oil rises quickly when the equipment is carried in an overload state, the equipment must be shut down, the shield tunneling machine is controlled by the PLC to be shut down, the oil temperature is reduced, and then the equipment is restarted;
B. when the oil temperature t4≤t≤t5(i.e. t is more than or equal to 50 ℃ and less than or equal to 60 ℃), the oil temperature reaches an alarm value, the oil must be cooled in time, the oil temperature is reduced to a safe area, and a variable frequency pump is accelerated, so that the heat exchange rate of the oil and the cooling water is accelerated; meanwhile, the PLC controls a proportional flow valve 46 in the cooling unit 4 to increase the flow of cooling water entering the first water inlet pipe 44, so that the oil temperature can be reduced in a short time, a second flow sensor 47 monitors the flow of cooling water in real time and reports the flow of cooling water to the PLC, and a fifth temperature sensor 7 monitors the flow of cooling water in the oil tank 1 in real timeThe oil temperature is preliminarily reduced to a safe interval;
C. the oil is preliminarily cooled by the cooling mechanism 5, and the oil temperature is preliminarily adjusted to t3≤t≤t4(i.e. t is more than or equal to 36 ℃ and less than or equal to 50 ℃), but the oil temperature is not stable at this time and needs to be further adjusted, and the oil enters the cooling unit 4;
D. the oil temperature is stably at t by the secondary cooling of the cooling unit 42≤t≤t3(i.e. t is more than or equal to 30 ℃ and less than or equal to 36 ℃) interval, at the moment, the oil temperature and the cooling water flow are in a stable state of dynamic balance, and the accurate temperature control is achieved.
The shield machine oil tank water cooling system is high in control precision, strong in stability and fast in response, and can enable temperature rise and cooling water flow to be in dynamic balance to a certain degree through multi-stage combined control.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The utility model provides a shield constructs quick-witted oil tank water cooling system which characterized in that: the device comprises an oil tank (1), a variable frequency pump (2), a high-pressure filter (3), an oil pipe (6), a cooling unit (4) and a PLC (programmable logic controller); a fifth temperature sensor (7) is arranged in the oil tank (1); a first flow sensor (59) is arranged on the oil pipe (6), and the oil pipe (6) comprises a first oil inlet section (61) and a first oil outlet section (62);
the cooling unit (4) comprises a first heat exchanger (43), a first water inlet pipe (44), a first water outlet pipe (45), a proportional flow valve (46) and a second flow sensor (47); the oil tank (1), the variable frequency pump (2), the high-pressure filter (3) and the first heat exchanger (43) are sequentially communicated through an oil pipe (6), and the tail end of the oil pipe (6) is connected into the oil tank (1); the first water inlet pipe (44), the first heat exchanger (43) and the first water outlet pipe (45) are connected in sequence;
a proportional flow valve (46) and a second flow sensor (47) are arranged on the first water inlet pipe (44), and the proportional flow valve (46) is arranged at the front end part of the first water inlet pipe (44);
the variable frequency pump (2), the proportional flow valve (46), the first flow sensor (59), the second flow sensor (47) and the fifth temperature sensor (7) are respectively connected with the PLC.
2. The shield machine sump water cooling system of claim 1, wherein: the first oil inlet section (61) is provided with a first pressure gauge (4a), a first thermometer (49) and a first butterfly valve (4 b); a third temperature sensor (40), a second pressure gauge (4c) and a second butterfly valve (4d) are arranged on the first oil outlet section (62); and the third temperature sensor (40) is connected with the PLC.
3. The shield machine sump water cooling system of claim 1, wherein: the first water inlet pipe (44) is also provided with a third pressure gauge (4e) and a first temperature sensor (48); a fourth pressure gauge (4f) and a second thermometer (4g) are arranged on the first water outlet pipe (45); the first temperature sensor (48) is connected with the PLC controller.
4. The shield machine sump water cooling system of claim 1, wherein: the device also comprises a cooling mechanism (5), wherein the cooling mechanism (5) comprises a second heat exchanger (53), a second water inlet pipe (54) and a second water outlet pipe (55); the oil pipe (6) further comprises a second oil inlet section (63) and a second oil outlet section (64), and the high-pressure filter (3), the second oil inlet section (63), the second heat exchanger (53), the second oil outlet section (64) and the first oil inlet section (61) are communicated in sequence; the second water inlet pipe (54), the second heat exchanger (53) and the second water outlet pipe (55) are connected in sequence;
a third flow sensor (58) is arranged on the second water inlet pipe (54); the third flow sensor (58) is connected with the PLC controller.
5. The shield machine sump water cooling system of claim 4, wherein: the second oil inlet section (63) is also provided with a third thermometer (56), a fifth pressure gauge (50) and a third butterfly valve (5 a);
a third temperature sensor (57), a sixth pressure gauge (5b) and a fourth butterfly valve (5c) are arranged on the second oil outlet section (64); and the third temperature sensor (57) is connected with the PLC.
6. The shield machine sump water cooling system of claim 4, wherein: a fourth temperature sensor (5d), a seventh pressure gauge (5e) and a fifth butterfly valve (5f) are also arranged on the second water inlet pipe (54); a fourth thermometer (5g), an eighth pressure gauge (5h) and a sixth butterfly valve (5j) are arranged on the second water outlet pipe (55); and the fourth temperature sensor (5d) is connected with the PLC.
7. The shield machine sump water cooling system of claim 1, wherein: still be equipped with liquid level switch group (8) in oil tank (1), liquid level switch group (8) include from last high liquid level switch (81), low liquid level switch (82) and the liquid level switch (83) of shutting down that set up extremely down, high liquid level switch (81), low liquid level switch (82) and shut down liquid level switch (83) are connected with the PLC controller respectively.
8. The shield machine oil tank water cooling system of claim 1, characterized in that: the proportional flow valve (46) is a two-way plug-in type proportional flow water valve; the first heat exchanger (43) and the second heat exchanger (53) are both plate heat exchangers.
9. A water cooling control method for an oil tank of a shield machine is characterized by comprising the following steps: the shield machine oil tank water cooling system of claim 4 is used for operation, parameters are set on the PLC, and the critical value t of the oil temperature regulation and control interval is divided5、t4、t3、t2And t1And t is5>t4>t3>t2>t1(ii) a Oil in the oil tank (1) is pumped out by the variable frequency pump (2), a pollution source is removed by filtering through the high-pressure filter (3), and the oil liquid is subjected to heat exchange with cooling water in the second heat exchanger (53) through the cooling mechanism (5) to finish primary cooling; then the oil liquid enters a cooling unit (4), a PLC monitors the temperature of the oil liquid in an oil tank (1) through a fifth temperature sensor (7) to control the flow rate of the cooling water entering a proportional flow valve (46) in the cooling unit (4), a second flow sensor (47) monitors in real time to control the heat exchange rate, and the oil temperature is controlled at t2≤t≤t3In the interval, the oil returns to the oil tank 1;
the oil temperature regulation and control method of the oil liquid comprises the following specific steps:
A. when the oil temperature t is more than or equal to t5When the oil temperature reaches the limit value, the PLC controls the shield tunneling machine to stop, so that the oil temperature is reduced, and then the equipment is restarted;
B. when the oil temperature t4≤t≤t5When the oil temperature reaches an alarm value, the variable frequency pump is accelerated, so that the heat exchange rate of the oil liquid and the cooling water is accelerated; meanwhile, the PLC controls a proportional flow valve (46) in the cooling unit (4) to increase the flow of cooling water entering the first water inlet pipe (44), a second flow sensor (47) monitors the flow of cooling water in real time and reports the flow of cooling water to the PLC, a fifth temperature sensor (7) monitors the temperature of oil in the oil tank (1) in real time, and the temperature of oil is preliminarily reduced to a safety interval;
C. the oil is preliminarily cooled by a cooling mechanism (5), and the oil temperature is preliminarily adjusted to t3≤t≤t4In the interval, the oil liquid enters a cooling unit (4);
D. the oil temperature is stably at t through the secondary cooling of the cooling unit (4)2≤t≤t3And in intervals, accurate temperature control is achieved.
10. The shield machine oil tank water-cooling control method according to claim 9, characterized in that: t is t5＝60℃，t4＝50℃，t3＝36℃，t2＝30℃，t1＝0℃。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943518A (en) * | 2021-02-09 | 2021-06-11 | 中国长江电力股份有限公司 | Hydraulic oil temperature control system and method for hydraulic turbine governor |
| CN114370445A (en) * | 2021-10-28 | 2022-04-19 | 中国航发西安动力控制科技有限公司 | Hydraulic system and method for accurately controlling oil temperature |
| CN114670247A (en) * | 2022-04-20 | 2022-06-28 | 江苏徐工工程机械研究院有限公司 | Cooling system of forcible entry robot and forcible entry robot |
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- 2020-11-20 CN CN202011307770.2A patent/CN112324759A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943518A (en) * | 2021-02-09 | 2021-06-11 | 中国长江电力股份有限公司 | Hydraulic oil temperature control system and method for hydraulic turbine governor |
| CN114370445A (en) * | 2021-10-28 | 2022-04-19 | 中国航发西安动力控制科技有限公司 | Hydraulic system and method for accurately controlling oil temperature |
| CN114370445B (en) * | 2021-10-28 | 2024-02-09 | 中国航发西安动力控制科技有限公司 | Hydraulic system and method for accurately controlling oil temperature |
| CN114670247A (en) * | 2022-04-20 | 2022-06-28 | 江苏徐工工程机械研究院有限公司 | Cooling system of forcible entry robot and forcible entry robot |
| CN114670247B (en) * | 2022-04-20 | 2023-12-08 | 江苏徐工工程机械研究院有限公司 | Broken cooling system who tears robot open and tear robot open |
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