CN102734269B - Energy-saving oil supply system of remanufactured heavy machine tool - Google Patents

Abstract

The embodiment of the invention provides an energy-saving oil supply system of a remanufactured heavy machine tool, comprising a temperature sensor, a first PID (Proportion Integration Differentiation) regulator, a PLC (Programmable Logic Controller), a first frequency converter and N air cooling devices, wherein the PLC stores information of N temperature ranges, the temperature sensor is used for detecting actual temperature of hydraulic oil in real time and transferring a signal containing an actual temperature value to the first PID regulator, the first PID regulator is used for comparing the actual temperature of the hydraulic oil with preset temperature and transferring a signal of the compared temperature to the PLC, the PLC is used for controlling at least one air cooling device to run by the first frequency converter according to the signal of the compared temperature, and cooling air volume of the controlled air cooling device and the actual temperature of the hydraulic oil are lowered to correspond to the cooling air volume needed at the preset temperature. According to the energy-saving oil supply system disclosed by the embodiment of the invention, the problem of energy waste of the existing energy-saving oil supply system is solved.

Description

A kind of energy-conservation oil supply system manufacturing heavy machine tool again

Technical field

The present invention relates to technical field of hydraulic pressure, more particularly, relate to a kind of energy-conservation oil supply system manufacturing heavy machine tool again.

Background technique

Manufacture heavy machine tool blank again and mostly be some ages lathe more remote, the oil supply system of these lathes comprises fuel tank, oil hydraulic pump, the parts such as oil hydraulic cylinder and oil hydraulic motor, wherein, oil hydraulic pump extracts the hydraulic oil in fuel tank, the mechanical energy of power engine is converted to the hydraulic energy of hydraulic oil, and send the hydraulic oil with hydraulic energy to oil hydraulic cylinder or oil hydraulic motor by the pipeline be connected with oil hydraulic cylinder or oil hydraulic motor, the hydraulic energy of hydraulic oil is converted to mechanical energy by oil hydraulic cylinder or oil hydraulic motor, realize the foreign work manufacturing heavy machine tool oil supply system again, after oil supply system processing tasks completes, the pipeline that hydraulic oil is connected with fuel tank by oil hydraulic cylinder or oil hydraulic motor, be back in fuel tank.

Claimant finds when studying the existing oil supply system manufacturing heavy machine tool again, and the existing oil supply system manufacturing heavy machine tool again exists the situation of energy dissipation, specifically comprises following aspect:

Manufacture the oil supply system of heavy machine tool more after a period of operation, the temperature of hydraulic oil can improve, affect the working efficiency of oil supply system, therefore need to carry out radiating and cooling process to oil supply system, make the temperature of hydraulic oil maintain in default temperature range value, existing hydraulic oil preset temperature interval value can be 40 DEG C to 50 DEG C.The existing radiating treatment mode manufacturing the oil supply system of heavy machine tool is again: arrange an air cooler, when the hydraulic fluid temperature in fuel tank exceedes preset temperature interval value, starts this air cooler and dispels the heat to the hydraulic oil in fuel tank.Although this radiating treatment mode can reduce the hydraulic fluid temperature of oil supply system to a certain extent, but the wind-force gear of air cooler is fixing, when the hydraulic oil temperature rise of energy-conservation oil supply system is lower, the power that the minimum wind force gear of air cooler is corresponding is higher relative to current hydraulic oil temperature rise, the cooling air quantity that air cooler provides and hydraulic oil temperature rise matching degree not high, there is the waste of energy;

Secondly, in some cases, during as execution work pinching action, the oil supply system manufacturing heavy machine tool again needs to provide constant delivery pressure, prior art can by regulating the aperture of the valve be arranged between oil hydraulic pump and oil hydraulic cylinder or oil hydraulic motor, thus the hydraulic energy that hydraulic control pump sends the hydraulic oil of oil hydraulic cylinder or oil hydraulic motor to remains constant, reaches the effect that oil supply system exports constant pressure; But this mode can cause hydraulic oil to produce larger loss of pressure head at valve place, causes damage, there is the waste of energy to the energy of oil supply system;

Again, when manufacturing heavy machine tool no-load running again, when oil supply system is still in running order, or during oil supply system off-load, the hydraulic energy of hydraulic oil can directly be discharged, and causes the waste of energy.

Summary of the invention

In view of this, the embodiment of the present invention provides a kind of energy-conservation oil supply system manufacturing heavy machine tool again, with the cooling air quantity that provides due to air cooler is provided and hydraulic oil temperature rise matching degree not high, and the energy dissipation problem caused, secondly, the energy dissipation problem because hydraulic oil causes in the loss of pressure head at valve place is solved, again, the hydraulic energy solving hydraulic oil is directly discharged, and the energy dissipation problem caused.

For achieving the above object, the embodiment of the present invention provides following technological scheme:

A kind of energy-conservation oil supply system manufacturing heavy machine tool again, comprise: be arranged at the temperature transducer in the fuel tank of described energy-conservation oil supply system, the the first proportion integration differentiation PID regulator be connected with described temperature transducer, the programmable logic controller (PLC) PLC be connected with a described PID regulator, described PLC stores the information of N number of temperature range, the temperature value of each temperature range is all greater than the preset temperature interval value of hydraulic oil, described N number of temperature range is that temperature value increases progressively interval, N be greater than 1 integer, the first frequency variator be connected with described PLC, and the N typhoon cooler to be connected with described first frequency variator, the cooling air quantity Q of air cooler _ifor:

$Q_i=\frac{2^{i-1}}{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{2}^{i-1}}Q,$ i＝1…N，

Q is the cooling air quantity required when being down to preset temperature of the maximum temperature of described N number of temperature range, and described preset temperature is in the preset temperature interval of described hydraulic oil;

Wherein, described temperature transducer, for detecting the true temperature of hydraulic oil in real time, sends a described PID regulator to by the signal including actual temperature value;

A described PID regulator, for the true temperature of hydraulic oil and described preset temperature being compared, is delivered to described PLC by the temperature signal after comparison;

Described PLC, for according to the temperature signal after described comparison, by described first frequency variator, control at least one typhoon cooler and run, cooling air quantity required when the cooling air quantity of the air cooler controlled and the true temperature of hydraulic oil are down to described preset temperature is corresponding.

Preferably, at least one typhoon cooler of described control runs, and cooling air quantity required when the cooling air quantity of the air cooler controlled and the true temperature of hydraulic oil are down to described preset temperature is corresponding to be specially:

From described N typhoon cooler, choose at least one typhoon cooler, the cooling power that described at least one typhoon cooler is provided is that P1, P1 meet following relation:

P1=PV/ (T1-T2) * (1+10%), PV=Pb*C*V*Tb/H, wherein, P1 for air cooler current needed for the cooling power that provides, PV is the heat that hydraulic oil produces, Pb is the proportion of hydraulic oil, and C is the specific heat of hydraulic oil, and V is the volume of fuel tank, Tb is the temperature rise of fuel tank, H is the temperature rise endurance, and T1 is described preset temperature, and T2 is the hydraulic oil true temperature that temperature transducer detects.

Preferably, described N is 4, and described N number of temperature range is respectively the first temperature range [T1, T2], the second temperature range [T2, T3], the 3rd temperature range [T3, T4] and the 4th temperature range [T4, T5];

Described N typhoon cooler comprises: cooling air quantity Q ₁for first air cooler of Q/15, cooling air quantity Q ₂for second air cooler of 2Q/15, cooling air quantity Q ₃for the 3rd air cooler of 4Q/15, and cooling air quantity Q ₄for the 4th air cooler of 8Q/15, Q is the cooling air quantity required when being down to described preset temperature by T5 of the temperature of hydraulic oil.

Preferably, described by described first frequency variator, control the operation of at least one typhoon cooler and be specially:

When described temperature transducer detects that the true temperature of hydraulic oil is in the first temperature range, described PLC is by the first air cooler converting operation described in described first Frequency Converter Control;

When described temperature transducer detects that the true temperature of hydraulic oil is in the second temperature range, described PLC is by the first air cooler power frequency operation described in described first Frequency Converter Control, and described second air cooler converting operation;

When described temperature transducer detects that the true temperature of hydraulic oil is in the 3rd temperature range, described PLC is by the first air cooler described in described first Frequency Converter Control and described second air cooler power frequency operation, and described 3rd typhoon cooler converting operation;

When described temperature transducer detects that the true temperature of hydraulic oil is in the 4th temperature range, described PLC is by the first air cooler, described second air cooler and described 3rd typhoon cooler power frequency operation described in described first Frequency Converter Control, and described 4th typhoon cooler converting operation.

Preferably, described first temperature range is 50 DEG C to 55 DEG C, described second temperature range 55 DEG C to 60 DEG C, and described 3rd temperature range is 60 DEG C to 65 DEG C, and described 4th temperature range is 65 DEG C to 70 DEG C.

Preferably, described energy-conservation oil supply system also comprises:

The the first variable frequency hydraulic pump be connected with described energy-conservation oil supply system fuel tank, be arranged at the pressure transducer that described first variable frequency hydraulic pump is connected in pipeline with oil hydraulic cylinder or the oil hydraulic motor of described energy-conservation oil supply system, the 2nd PID regulator be connected with described PLC with described pressure transducer respectively, the second frequency variator be connected with described PLC, the first adjustable frequency motor be connected with described first variable frequency hydraulic pump with described second frequency variator respectively;

Described pressure transducer, for detecting the pressure of the hydraulic oil in described pipeline, sends described 2nd PID regulator to by the signal including described force value;

Described 2nd PID regulator, compares for the pressure of hydraulic oil that detected by described pressure transducer and preset pressure, exports the pressure signal after comparison to described PLC;

Described PLC, for according to the pressure signal after described comparison, by described second frequency variator, control described first adjustable frequency motor running, to control the working state of described first variable frequency hydraulic pump, the pressure maintaining the hydraulic oil in described pipeline is described preset pressure.

Preferably, described energy-conservation oil supply system also comprises:

The second adjustable frequency motor be connected with described second frequency variator;

The the second variable frequency hydraulic pump be connected with described energy-conservation oil supply system fuel tank with described second adjustable frequency motor respectively.

Preferably, described energy-conservation oil supply system also comprises:

The generator be connected with the oil hydraulic motor of described energy-conservation oil supply system;

The storage battery be connected with described generator.

Based on technique scheme, a kind of energy-conservation oil supply system manufacturing heavy machine tool again that the embodiment of the present invention provides, the information of N number of temperature range is stored in PLC, the temperature value of each temperature range of N number of temperature range is all greater than the preset temperature interval value of hydraulic oil, when being down to preset temperature according to different temperatures interval, the difference of required cooling air quantity chooses N typhoon cooler, when the true temperature of hydraulic oil is in a certain interval of N number of temperature range, cooling air quantity required when can control to be down to described preset temperature with the true temperature of hydraulic oil, corresponding air cooler runs; The temperature rise of hydraulic oil is carried out interval division by the embodiment of the present invention, and choose air cooler according to the temperature range after dividing, the matching degree of the cooling air quantity that air cooler is provided and hydraulic oil temperature rise is relatively high, realized the working state control of different air cooler simultaneously by converter technique, decrease the waste of energy-conservation oil supply system energy;

Secondly, the embodiment of the present invention does not re-use the pressure that valve regulated oil hydraulic pump sends the hydraulic oil of oil hydraulic cylinder or oil hydraulic motor to, but achieve by converter technique the constant pressure that the first variable frequency hydraulic pump sends the hydraulic oil of oil hydraulic cylinder or oil hydraulic motor to, maintain the constant output pressure of the energy-conservation oil supply system manufacturing heavy machine tool again, further reduce the waste of energy-conservation oil supply system energy;

Again, the hydraulic energy of the hydraulic oil directly discharged in prior art also reclaims by the embodiment of the present invention, and by transformation of energy, hydraulic energy is finally converted to electric energy, is stored in storage battery, further decrease the waste of energy-conservation oil supply system energy.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is a kind of structural representation manufacturing the embodiment one of the energy-conservation oil supply system of heavy machine tool more provided by the invention;

Fig. 2 is a kind of structural representation manufacturing the embodiment two of the energy-conservation oil supply system of heavy machine tool more provided by the invention;

Fig. 3 is a kind of structural representation manufacturing the embodiment three of the energy-conservation oil supply system of heavy machine tool more provided by the invention;

Fig. 4 is a kind of structural representation manufacturing the embodiment four of the energy-conservation oil supply system of heavy machine tool more provided by the invention;

Fig. 5 is a kind of structural representation manufacturing the embodiment five of the energy-conservation oil supply system of heavy machine tool more provided by the invention;

Fig. 6 is a kind of structural representation manufacturing the embodiment six of the energy-conservation oil supply system of heavy machine tool more provided by the invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Fig. 1 is a kind of structural representation manufacturing the embodiment one of the energy-conservation oil supply system of heavy machine tool more provided by the invention, with reference to Fig. 1, this energy-conservation oil supply system comprises: fuel tank 1, oil hydraulic pump 2, oil hydraulic cylinder 3, oil hydraulic motor 4, temperature transducer 5, one PID(Proportion Integration Differentiation, proportion integration differentiation) regulator 6, PLC(Programmable Logic Controller, programmable logic controller (PLC)) 7, first frequency variator 8 and N typhoon cooler 9, N be greater than 1 integer, in Fig. 1, heavy line represents the oil line pipe of hydraulic oil, fine line represents signal transmission circuit.

It should be noted that, embodiment of the present invention PLC7 stores the information of N number of temperature range, N be greater than 1 integer, the temperature value of each temperature range of this N number of temperature range is all greater than the preset temperature interval value of hydraulic oil, according to the regulation that existing hydraulic oil preset temperature interval value is 40 DEG C to 50 DEG C, then the temperature value of N number of temperature range that provides of the embodiment of the present invention is all on 50 DEG C;

Described N number of temperature range is that temperature value increases progressively interval, the temperature data of N group temperature value more than 50 DEG C can be stored in PLC7, one group of data represents the temperature range of a temperature value more than 50 DEG C, and in each group of N group temperature data, between temperature data and group, temperature data presents and increases progressively relation;

Concrete numerical value about N number of temperature range is arranged can be determined according to concrete oil supply system situation.

The information of selected N number of temperature range that must store according to PLC7 of the cooling air quantity of N typhoon cooler is carried out, and concrete, the cooling air quantity of N typhoon cooler can be chosen according to following formula:

$Q_i=\frac{2^{i-1}}{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{2}^{i-1}}Q,i=1...N,$

When namely determining for the number N of temperature range, the cooling air quantity of corresponding each air cooler also can be determined, is respectively $Q_1=\frac{1}{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{2}^{i-1}}Q,$ $Q_2=\frac{2}{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{2}^{i-1}}Q...$ $Q_i=\frac{2^{i-1}}{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{2}^{i-1}}Q;$

Q is the cooling air quantity required when being down to preset temperature of the maximum temperature of N number of temperature range, this preset temperature is in the preset temperature interval of hydraulic oil, according to the regulation that existing hydraulic oil preset temperature interval value is 40 DEG C to 50 DEG C, this preset temperature can be chosen in 50 DEG C at 40 DEG C.

The above-mentioned system construction manufacturing the energy-conservation oil supply system of heavy machine tool again provided for the embodiment of the present invention, the energy-conservation oil supply system manufacturing heavy machine tool again provided for making the embodiment of the present invention is more clear, complete, is introduced below to the working principle manufacturing the energy-conservation oil supply system of heavy machine tool again that the embodiment of the present invention provides.

Temperature transducer 5 is arranged in fuel tank 1, for detecting the hydraulic oil true temperature of energy-conservation oil supply system in real time, sends the signal comprising hydraulic oil actual temperature value detected to a PID regulator 6;

Concrete, temperature transducer 5 sends a PID regulator 6 to after the signal comprising hydraulic oil actual temperature value detected in real time can being converted to digital signal by analogue signal.

One PID regulator 6 is connected with PLC7 with temperature transducer 5, and the true temperature of hydraulic oil and preset temperature, containing the signal of hydraulic oil actual temperature value, are compared, sent the temperature signal after comparison to PLC7 by receiving package.

PLC7 is connected with the first frequency variator 8, first frequency variator 8 is connected with N typhoon cooler 9, PLC7 is according to the temperature signal after the comparison received, by the first frequency variator 8, control at least one typhoon cooler to run, cooling air quantity required when the cooling air quantity of the air cooler controlled and the true temperature of hydraulic oil are down to described preset temperature is corresponding.

According to the temperature rise situation of the relatively described preset temperature of true temperature of hydraulic oil, PLC7 can control startup 1 or multiple stage air cooler, described preset temperature is down to make the true temperature of hydraulic oil, describe the cooling air quantity situation of each air cooler above, cooling air quantity required when being down to described preset temperature according to the true temperature of hydraulic oil, PLC7 can control to provide the air cooler of this cooling air quantity to run, the air cooler number of units of institute's controlling run can be one also can be multiple stage, when being down to described preset temperature by the true temperature of hydraulic oil, required cooling air quantity is determined,

Concrete, have received the temperature signal of PID regulator 6 transmission at PLC7 after, cooling air quantity required when PLC7 can be down to described preset temperature according to the true temperature of this temperature signal determination hydraulic oil, PLC7 chooses at least one typhoon cooler from N typhoon cooler 9, the cooling power that described at least one typhoon cooler is provided is P1, P1 for air cooler current needed for the cooling power that provides, cooling power P1 can be the cooling power of a typhoon cooler, also can be the cooling power sum of multiple stage air cooler, cooling power and cooling air quantity can convert mutually, P1 can by listed in Table go out formula determine:

Embodiment of the present invention PLC 7 is not that directly control N typhoon cooler 9 runs, but after carrying out frequency modulation by the first frequency variator 8, by the running state of the FREQUENCY CONTROL N typhoon cooler 9 after modulation, when starting multiple stage air cooler, PLC 7 can according to the temperature rise situation of reality by the relatively weak air cooler power frequency operation of the first frequency variator 8 controlled cooling model air quantity, air cooler converting operation that cooling air quantity is relatively high, or the equal power frequency operation of each air cooler; Concrete, wave filter can be set between the first frequency variator 8 and N number of air cooler 9, the electrical signal that first frequency variator 8 output frequency changes also exports to corresponding air cooler after filter filtering, be motor speed by frequency conversion basic principle n=60f/p(n, p is number of pole-pairs, and f is frequency) known, the change of frequency of air cooler is proportional to rotation speed change, after the signal of frequency shift exports to air cooler, drive air cooler converting operation.

Control air cooler for ease of the PLC 7 understood described by the embodiment of the present invention by the first frequency variator 8 to run, below with N for 4, namely the situation that the temperature range that PLC 7 stores is 4, air cooler number of units is 4 is example, is described in detail to the situation that PLC 7 controls air cooler operation by the first frequency variator 8.

Fig. 2 is a kind of structural representation manufacturing the embodiment two of the energy-conservation oil supply system of heavy machine tool more provided by the invention, illustrate the energy-conservation oil supply system structure when N is 4, these 4 temperature ranges can be divided into the first temperature range [T1, T2], the second temperature range [T2, T3], 3rd temperature range [T3, T4] and the 4th temperature range [T4, T5], T1, T2, T3, T4 and T5 are for increasing progressively relation;

Preferably, these 4 temperature ranges can be 50 DEG C to 55 DEG C, 55 DEG C to 60 DEG C, 60 DEG C to 65 DEG C and 65 DEG C to 70 DEG C, and 70 DEG C is a temperature upper limit of fuel tank, obviously, also can be that other increase progressively the Temperature numerical of relation;

Corresponding, the cooling air quantity of 4 selected typhoon coolers is respectively:

First air cooler $Q_1=\frac{2^{i-1}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{2}^{i-1}}Q=\frac{Q}{15},$ Second air cooler $Q_2=\frac{2^{2-1}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{2}^{i-1}}Q=\frac{2Q}{15},$ 3rd air cooler $Q_3=\frac{2^{3-1}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{2}^{i-1}}Q=\frac{4Q}{15},$ 4th air cooler $Q_4=\frac{2^{4-1}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{2}^{i-1}}Q=\frac{8Q}{15},$ Wherein Q is the cooling air quantity required when being down to described preset temperature by T5 of the temperature of hydraulic oil.

When temperature transducer 5 detects that the true temperature of hydraulic oil is in the first temperature range, PLC7 controls the first air cooler converting operation by the first frequency variator 8;

When temperature transducer 5 detects that the true temperature of hydraulic oil is in the second temperature range, PLC7 controls the first air cooler power frequency operation by the first frequency variator 8, and the second air cooler converting operation;

When temperature transducer 5 detects that the true temperature of hydraulic oil is in the 3rd temperature range, PLC7 controls the first air cooler power frequency operation by the first frequency variator 8, the second typhoon cooler power frequency operation, and the 3rd typhoon cooler converting operation;

When temperature transducer 5 detects that the true temperature of hydraulic oil is in the 4th temperature range, PLC7 controls described first air cooler power frequency operation, the second typhoon cooler power frequency operation and the 3rd typhoon cooler power frequency operation, and described 4th typhoon cooler converting operation.

Due to the restriction of fuel tank volume, the temperature range number N of the embodiment of the present invention is preferably not more than 5, is limited within 5 to make the air cooler number of units chosen.

A kind of energy-conservation oil supply system manufacturing heavy machine tool again that the embodiment of the present invention provides, the information of N number of temperature range is stored in PLC, the temperature value of each temperature range of N number of temperature range is all greater than the preset temperature interval value of hydraulic oil, when being down to preset temperature according to different temperatures interval, the difference of required cooling air quantity chooses N typhoon cooler, when the true temperature of hydraulic oil is in a certain interval of N number of temperature range, cooling air quantity required when can control to be down to described preset temperature with the true temperature of hydraulic oil, corresponding air cooler runs; The temperature rise of hydraulic oil is carried out interval division by the embodiment of the present invention, and choose air cooler according to the temperature range after dividing, the matching degree of the cooling air quantity that air cooler is provided and hydraulic oil temperature rise is relatively high, realized the working state control of different air cooler simultaneously by converter technique, decrease the waste of energy-conservation oil supply system energy.

Fig. 3 is a kind of structural representation manufacturing the embodiment three of the energy-conservation oil supply system of heavy machine tool more provided by the invention, shown in composition graphs 1 and Fig. 3, shown in Fig. 3, the oil hydraulic pump of energy-conservation oil supply system compares oil hydraulic pump shown in Fig. 1 specifically, oil hydraulic pump described in Fig. 3 is variable frequency hydraulic pump, shown in Fig. 3, the first variable frequency hydraulic pump 10 is connected with energy-conservation oil supply system fuel tank 1, energy-conservation oil supply system shown in Fig. 3 also comprises on the basis of oil supply system energy-conservation shown in Fig. 1: pressure transducer 11,2nd PID regulator 12, second frequency variator 13, and the first adjustable frequency motor 14.

Pressure transducer 11 is arranged at the oil hydraulic cylinder 3 of the first variable frequency hydraulic pump 10 and energy-conservation oil supply system or oil hydraulic motor 4 is connected in pipeline, detect the pressure of the hydraulic oil after the first variable frequency hydraulic pump 10 transformation of energy, will the Signal transmissions of described force value be comprised to the 2nd PID regulator 12.

2nd PID regulator 12 is connected with PLC7 with pressure transducer 11, pressure and the preset pressure of the hydraulic oil detected by pressure transducer are compared, export the pressure signal after comparison to PLC7, preset pressure and the energy-conservation oil supply system manufacturing heavy machine tool again need the constant output pressure that provides relevant.

PLC7 is according to the pressure signal after the 2nd PID regulator 12 comparison, by the second frequency variator 13, control the first adjustable frequency motor 14 to operate, to control the working state of the first variable frequency hydraulic pump 10, the pressure maintaining the hydraulic oil after the first variable frequency hydraulic pump 10 transformation of energy is described preset pressure.

A kind of energy-conservation oil supply system manufacturing heavy machine tool again that the embodiment of the present invention provides, achieving cooling air quantity that air cooler provides and the relatively high matching degree of hydraulic oil temperature rise, and achieved on the basis of working state control of different air cooler by converter technique, the constant of the pressure of the hydraulic oil after the first variable frequency hydraulic pump transformation of energy is also achieved by converter technique, maintain the constant output pressure of the energy-conservation oil supply system manufacturing heavy machine tool again, further reduce the waste of energy-conservation oil supply system energy.

Fig. 4 is a kind of structural representation manufacturing the embodiment four of the energy-conservation oil supply system of heavy machine tool more provided by the invention, shown in composition graphs 3 and Fig. 4, energy-conservation oil supply system shown in Fig. 4 also comprises relative to oil supply system energy-conservation shown in Fig. 3: the second adjustable frequency motor 15 be connected with the second frequency variator 13; The the second variable frequency hydraulic pump 16 be connected with fuel tank 1 with the second adjustable frequency motor 13 respectively.

First adjustable frequency motor 14 and the second adjustable frequency motor 15, first variable frequency hydraulic pump 10 identical with the performance parameter of the second variable frequency hydraulic pump 16.When the first adjustable frequency motor 14 and/or the first variable frequency hydraulic pump 10 fault, the second adjustable frequency motor 15 and the second variable frequency hydraulic pump 16 can be started, guarantee that energy-conservation oil supply system maintains normal working state.When adjacent twice startup of energy-conservation oil supply system, also the first adjustable frequency motor 14, first variable frequency hydraulic pump 10 can be taken turns starting, with the second adjustable frequency motor 15, second variable frequency hydraulic pump 16, ensure that two frequency conversion motors and two variable frequency hydraulic pumps can be often in running order, the problems such as the fault avoiding the idleness of equipment to cause.

Fig. 5 is a kind of structural representation manufacturing the embodiment five of the energy-conservation oil supply system of heavy machine tool more provided by the invention, shown in composition graphs 1 and Fig. 5, shown in Fig. 5, energy-conservation oil supply system also comprises: the generator 17 be connected with oil hydraulic motor 4, and the storage battery 18 be connected with generator 17.

Manufacturing heavy machine tool no-load running again, when energy-conservation oil supply system is still in running order, the two position two-way valve that can control to be connected with oil hydraulic motor 4 makes it be on positi, hydraulic oil is through oil hydraulic motor 4 place, oil hydraulic motor 4 rotarily drives generator 17 and operates, and generator 17 rotates electrical power storage among storage battery 18.

Complete at the processing tasks of energy-conservation oil supply system, when carrying out energy-conservation oil supply system off-load, the three position four-way directional control valve that can control to be connected with oil hydraulic cylinder 3 commutates, the two position two-way valve that simultaneously makes to be connected with oil hydraulic motor 4 is on positi, three-position four-way valve electromagnet DT1 sends electrical signal to two position two-way valve electromagnet DT2 simultaneously, oil hydraulic cylinder 3 is got back to original position gradually and is started relief circuit, Liquid Residue pressure energy is reclaimed, hydraulic oil is through oil hydraulic motor 4 place, oil hydraulic motor 4 rotarily drives generator 17 and operates, and generator 17 rotates electrical power storage among storage battery 18.

A kind of energy-conservation oil supply system manufacturing heavy machine tool again that the embodiment of the present invention provides, achieving cooling air quantity that air cooler provides and the relatively high matching degree of hydraulic oil temperature rise, and achieved on the basis of working state control of different air cooler by converter technique, also the hydraulic energy of the hydraulic oil directly discharged in prior art is reclaimed, and pass through transformation of energy, hydraulic energy is finally converted to electric energy, is stored in storage battery, further reduce the waste of energy-conservation oil supply system energy.

Fig. 6 is a kind of structural representation manufacturing the embodiment six of the energy-conservation oil supply system of heavy machine tool more provided by the invention.Fig. 6 shows the comparatively complete energy-conservation oil supply system of the present invention.Energy-conservation oil supply system shown in Fig. 6 is achieving relatively high the mating with hydraulic oil temperature rise of cooling air quantity that air cooler provides, and while the control of working state being achieved different air cooler by converter technique, the constant pressure of the hydraulic oil after the first variable frequency hydraulic pump transformation of energy is also achieved by converter technique, maintain the constant output pressure of the energy-conservation oil supply system manufacturing heavy machine tool again, also the hydraulic energy of the hydraulic oil directly discharged in prior art is reclaimed, and pass through transformation of energy, hydraulic energy is finally converted to electric energy, be stored in storage battery, the energy-conservation oil supply system of heavy machine tool is manufactured again shown in Fig. 6, greatly reduce the waste of energy-conservation oil supply system energy.

To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (8)

1. one kind manufactures the energy-conservation oil supply system of heavy machine tool again, it is characterized in that, comprise: be arranged at the temperature transducer in the fuel tank of described energy-conservation oil supply system, the PID regulator be connected with described temperature transducer, the programmable logic controller (PLC) PLC be connected with a described PID regulator, described PLC stores the information of N number of temperature range, the temperature value of each temperature range is all greater than the preset temperature interval value of hydraulic oil, described N number of temperature range is that temperature value increases progressively interval, N be greater than 1 integer, the first frequency variator be connected with described PLC, and the N typhoon cooler to be connected with described first frequency variator, the cooling air quantity Q of air cooler _ifor:

$Q_i=\frac{2^{i-1}}{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{2}^{i-1}}Q,i=1...N,$

Q is the cooling air quantity required when being down to preset temperature of the maximum temperature of described N number of temperature range, and described preset temperature is in the preset temperature interval of described hydraulic oil;

Wherein, described temperature transducer, for detecting the true temperature of hydraulic oil in real time, sends a described PID regulator to by the signal including actual temperature value;

A described PID regulator, for the true temperature of hydraulic oil and described preset temperature being compared, is delivered to described PLC by the temperature signal after comparison;

Described PLC, for according to the temperature signal after described comparison, by described first frequency variator, control at least one typhoon cooler and run, cooling air quantity required when the cooling air quantity of the air cooler controlled and the true temperature of hydraulic oil are down to described preset temperature is corresponding.

2. the energy-conservation oil supply system manufacturing heavy machine tool more according to claim 1, it is characterized in that, at least one typhoon cooler of described control runs, and cooling air quantity required when the cooling air quantity of the air cooler controlled and the true temperature of hydraulic oil are down to described preset temperature is corresponding to be specially:

From described N typhoon cooler, choose at least one typhoon cooler, the cooling power that described at least one typhoon cooler is provided is that P1, P1 meet following relation:

P1=PV/ (T1-T2) * (1+10%), PV=Pb*C*V*Tb/H, wherein, P1 for air cooler current needed for the cooling power that provides, PV is the heat that hydraulic oil produces, Pb is the proportion of hydraulic oil, and C is the specific heat of hydraulic oil, and V is the volume of fuel tank, Tb is the temperature rise of fuel tank, H is the temperature rise endurance, and T1 is described preset temperature, and T2 is the hydraulic oil true temperature that temperature transducer detects.

3. the energy-conservation oil supply system manufacturing heavy machine tool more according to claim 1 and 2, it is characterized in that, described N is 4, described N number of temperature range is respectively the first temperature range [T1, T2], the second temperature range [T2, T3], 3rd temperature range [T3, T4] and the 4th temperature range [T4, T5];

Described N typhoon cooler comprises: cooling air quantity Q ₁for first air cooler of Q/15, cooling air quantity Q ₂for second air cooler of 2Q/15, cooling air quantity Q ₃for the 3rd air cooler of 4Q/15, and cooling air quantity Q ₄for the 4th air cooler of 8Q/15, Q is the cooling air quantity required when being down to described preset temperature by T5 of the temperature of hydraulic oil.

4. the energy-conservation oil supply system manufacturing heavy machine tool more according to claim 3, is characterized in that, described by described first frequency variator, controls the operation of at least one typhoon cooler and is specially:

When described temperature transducer detects that the true temperature of hydraulic oil is in the first temperature range, described PLC is by the first air cooler converting operation described in described first Frequency Converter Control;

When described temperature transducer detects that the true temperature of hydraulic oil is in the second temperature range, described PLC is by the first air cooler power frequency operation described in described first Frequency Converter Control, and described second air cooler converting operation;

When described temperature transducer detects that the true temperature of hydraulic oil is in the 3rd temperature range, described PLC is by the first air cooler described in described first Frequency Converter Control and described second air cooler power frequency operation, and described 3rd air cooler converting operation;

When described temperature transducer detects that the true temperature of hydraulic oil is in the 4th temperature range, described PLC is by the first air cooler, described second air cooler and described 3rd air cooler power frequency operation described in described first Frequency Converter Control, and described 4th air cooler converting operation.

5. the energy-conservation oil supply system manufacturing heavy machine tool more according to claim 3, it is characterized in that, described first temperature range is 50 DEG C to 55 DEG C, and described second temperature range is 55 DEG C to 60 DEG C, described 3rd temperature range is 60 DEG C to 65 DEG C, and described 4th temperature range is 65 DEG C to 70 DEG C.

6. the energy-conservation oil supply system manufacturing heavy machine tool more according to claim 1, is characterized in that, also comprise:

The the first variable frequency hydraulic pump be connected with described energy-conservation oil supply system fuel tank, be arranged at the pressure transducer that described first variable frequency hydraulic pump is connected in pipeline with oil hydraulic cylinder or the oil hydraulic motor of described energy-conservation oil supply system, the 2nd PID regulator be connected with described PLC with described pressure transducer respectively, the second frequency variator be connected with described PLC, the first adjustable frequency motor be connected with described first variable frequency hydraulic pump with described second frequency variator respectively;

Described pressure transducer, for detecting the pressure of the hydraulic oil in described pipeline, sends described 2nd PID regulator to by the signal including described force value;

Described 2nd PID regulator, compares for the pressure of hydraulic oil that detected by described pressure transducer and preset pressure, exports the pressure signal after comparison to described PLC;

Described PLC, for according to the pressure signal after described comparison, by described second frequency variator, control described first adjustable frequency motor running, to control the working state of described first variable frequency hydraulic pump, the pressure maintaining the hydraulic oil in described pipeline is described preset pressure.

7. the energy-conservation oil supply system manufacturing heavy machine tool more according to claim 6, is characterized in that, also comprise:

The second adjustable frequency motor be connected with described second frequency variator;

The the second variable frequency hydraulic pump be connected with described energy-conservation oil supply system fuel tank with described second adjustable frequency motor respectively.

8. the energy-conservation oil supply system manufacturing heavy machine tool again according to claim 1 or 6 or 7, is characterized in that, also comprise:

The generator be connected with the oil hydraulic motor of described energy-conservation oil supply system;

The storage battery be connected with described generator.