CN105703323A - Water gate overload protection method and water gate overload protection device - Google Patents

Abstract

The invention discloses a water gate overload protection method and water gate overload protection device. The water gate overload protection device mainly comprises a single-chip microcomputer, a load sensor signal conditioning circuit, a load sensor, a keyboard, a gate level sensor, a water level sensor, an LCD, a relay, a water gate main power supply circuit and an alarm circuit. The protection device presets load protection values and running time of a water gate in different running stages according to the stress condition and running condition of the water gate, and by monitoring the load, gate level and water level in real time in a running process, sends out a corresponding control command; and when overload is judged to exist, a power supply main circuit of water gate equipment is switched off in time, thereby achieving the purpose of accurately protecting the water gate equipment. The protection device, as modularized equipment, has the characteristics of being strong in adaptability and being easy to install, and can be widely applied to water gates in the industries of water conservation and hydropower and the like, thereby ensuring the safe operation of the equipment, and prolonging the service life of the equipment.

Description

A kind of sluice overload protection method and sluice overload protection arrangement

Technical field

The present invention relates to a kind of sluice overload protection method for water conservancy and hydropower industry and overload protection arrangement, especially one sluice overload protection method and overload protection arrangement。

Background technology

In sluice automatic control system, it is ensured that the safe operation of the equipment such as sluice and motor is top priority, its protective measure should adopt multi-level, omnibearing。The measures such as overcurrent protection, position limitation protection, load protection is usually taken。In load protection; load protection device conventional at present adopts simple maximum judgment mode; whole process fixes a maximum load as protection foundation, and this load controlled method is comparatively extensive, and according to a peak load protection, sluice running can not be reached desirable protected effect。

Summary of the invention

The technical problem to be solved: provide a kind of safe and reliable, by sluice run be divided into different phase and sluice overload protection method and the sluice overload protection arrangement of flexible automatically control can be carried out according to sluice difference operation phase load change curve。

Disclosure one sluice overload protection method; its sluice load in detection sluice running, lock position and water level; record is when front brake position and a upper moment lock position, it is judged that sluice running status also calculates theoretical load, and described judgement sluice running status also calculates the method for theoretical load and is:

Sluice load in detection sluice running, lock position and water level, record is when front brake position and a upper moment lock position, it is judged that sluice running status also calculates theoretical load, and described judgement sluice running status also calculates the method for theoretical load and is:

(1) when front brake position and upper moment lock bit comparison described in, when lock position increases, it is judged that sluice is in lifting state, can be calculated theory load H by following formula_u:

H_u=f (h, μ, S)=f+G=μ F'+G=μ × ρ gh × S+G

(2) when front brake position and upper moment lock bit comparison described in, when lock position reduces, it is judged that sluice is in decline state, and now, theory load is relevant with sluice type；

When wirerope lock declines, theory load H can be calculated by following formula_d:

H_d=f (h, μ, S)=G-f=G-μ F'=G-μ × ρ gh × S

When screw brake declines, theory load H can be calculated by following formula_d:

H_d=f (h, μ, S)=F_?+ f-G=F_?+ μ F'-G=F_?+μ×ρgh×S-G

H in formula_uPromoting for sluice is theory load, H_dTheory load when declining for sluice, S are the contact area m of sluice and water², ρ be the density Kg/m of water³, g be acceleration of gravity m/s², h be contact degree of depth m, the h' of sluice and water be depth capacity m, the F that sluice contacts with water_?Be coefficient of friction, F' for screw thread to be sluice gravity N, f to holding power N, G of sluice be sluice and the frictional force N of track, μ it is the water lateral pressure N to sluice；

By sluice real load H and described theory load H_uOr H_dCompare, as H > > H_uOr H > > H_dTime, implement sluice overload protection。

The theoretical maximum load of described theory load is calculated；

Theoretical maximum load H when sluice promotes can be calculated by following formula_umax:

H_umax=f (h, μ, S)=f+G=μ F'+G=μ × ρ gh' × S+G

Theoretical maximum load H when wirerope sluice declines can be calculated by following formula_dmax:

H_dmax=f (h, μ, S)=G-f=G-μ F'=G-μ × ρ gh' × S

Theoretical maximum load H when screw rod sluice declines can be calculated by following formula_dmax:

H_dmax=f (h, μ, S)=F_?+ f-G=F_?+ μ F'-G=F_?+μ×ρgh'×S-G

H in formula_umaxPromoting for sluice is theory load, H_dmaxTheory load when declining for sluice, S are the contact area m of sluice and water², ρ be the density Kg/m of water³, g be acceleration of gravity m/s², h be contact degree of depth m, the h' of sluice and water be depth capacity m, the F that sluice contacts with water_?Be sluice gravity N, f to holding power N, G of sluice be sluice for screw thread it is the water lateral pressure N to sluice with the frictional force N of track, F'；

Theoretical maximum load H when sluice real load H is promoted with described sluice_umaxOr theoretical maximum load H during sluice decline_dmaxCompare, as H > H_umaxOr H > H_dmaxTime, implement sluice overload protection。

(1) when front brake position and upper moment lock bit comparison described in, when lock position increases, it is judged that sluice is in lifting state, can be calculated theory load H by following formula_u:

H_u=f (h, μ, S)=f+G=μ F'+G=μ × ρ gh × S+G

(2) when front brake position and upper moment lock bit comparison described in, when lock position reduces, it is judged that sluice is in decline state, and now, theory load is relevant with sluice type；

When wirerope lock declines, theory load H can be calculated by following formula_d:

H_d=f (h, μ, S)=G-f=G-μ F'=G-μ × ρ gh × S

When screw brake declines, theory load H can be calculated by following formula_d:

H_d=f (h, μ, S)=F_?+ f-G=F_?+ μ F'-G=F_?+μ×ρgh×S-G

H in formula_uPromoting for sluice is theory load, H_dTheory load when declining for sluice, S are the contact area m of sluice and water², ρ be the density Kg/m of water³, g be acceleration of gravity m/s², h be contact degree of depth m, the h' of sluice and water be depth capacity m, the F that sluice contacts with water_?Be coefficient of friction, F' for screw thread to be sluice gravity N, f to holding power N, G of sluice be sluice and the frictional force N of track, μ it is the water lateral pressure N to sluice；

By sluice real load H and described theory load H_uOr H_dCompare, as H > > H_uOr H > > H_dTime, implement sluice overload protection。

Disclosure one sluice overload protection arrangement, it is characterised in that: it is made up of single-chip microcomputer, load modulate circuit, load transducer, keyboard, lock level sensor, level sensor, LCD display, relay, the main power supply circuits of sluice and warning circuit；Described single-chip microcomputer electrically connects with load cell signal modulate circuit, and described load transducer electrically connects with load cell signal modulate circuit；Described single-chip microcomputer electrically connects with keyboard；Described single-chip microcomputer electrically connects with lock level sensor；Described single-chip microcomputer electrically connects with level sensor；Described single-chip microcomputer electrically connects with LCD display；Described single-chip microcomputer electrically connects with relay；The main power supply circuits of described sluice electrically connect with relay；Described warning circuit electrically connects with single-chip microcomputer；Described single-chip microcomputer is built-in with program; this program is according to the described theory load computational methods in sluice running; the water level of the sluice load, the lock position of lock level sensor detection and the level sensor detection that are detected by load transducer; judge sluice running status; the sluice load of described detection and theory load are compared; when the sluice load of detection is more than theory load; described relay is issued instructions to by described single-chip processor i/o mouth; described relay disconnects main current supply circuit, implements sluice overload protection。

The output signal of described load transducer is voltage signal, described voltage signal is as the input signal of described load cell signal modulate circuit, and this signal is amplified by described load cell signal modulate circuit, filters, be connected with described single-chip microcomputer after amplitude limit。Described single-chip microcomputer has 32 I/O mouths, 2 serial ports。Described keyboard is connected with the I/O mouth of described single-chip microcomputer；Described lock level sensor is connected with the I/O mouth of described single-chip microcomputer。Described level sensor is connected with the serial ports 2 of described single-chip microcomputer by MAX485。Described LCD display adopts SPI mode to be connected with the I/O mouth of described single-chip microcomputer。Be set to recommend output by the I/O mouth that described single-chip microcomputer is connected with described relay, warning circuit, described in recommend output drive described relay and warning circuit, the break-make of the described main power supply circuits of Control sluice respectively。

The present invention operation characteristic according to sluice, runs sluice whole process and is divided into: the startup stage of carrying lock, carry the lock stage under water, carry lock stage, barrier gate in the air startup stage, aerial barrier gate stage, under water barrier gate stage。In each operation phase, having a maximum load value, this protection device presets each stage load protection value, by monitoring lock position, water level, the situation of change according to lock place value Yu water level value, it is judged that the operation phase residing for gate in real time in running。Real-time load is compared with setting load, when judging that load is transshipped, sends corresponding control instruction, disconnect the power supply major loop of sluice equipment in time, reach accurately to protect the purpose of sluice equipment。

This load protection device is according to the load condition of different phase in sluice running, by detecting sluice load real-time change, sluice is carried out Flexible Control protection, is a kind of relatively effective protected mode。

The guard method of the present invention relates to screw rod sluice and wirerope sluice at the force analysis promoted or in decline process, draws the load change curve of sluice equipment in sluice running according to force analysis and carries out Flexible Control according to the curve of load。

As shown in Figure 1, F is the power of motor output, F to sluice stress model operationally_?Be sluice gravity, f to the holding power of sluice, G be sluice for screw thread it is that water is to the lateral pressure of sluice, F with the frictional force of track, F' " for the track support force to sluice, from sluice force diagram:

F'=F " (1)

F=uF'(2)

In formula, u is coefficient of friction, and sluice is relevant with the contact area of the contact degree of depth of sluice and water, sluice and water by the size of the lateral pressure of water, and its relational expression is as follows:

F'=P × S=ρ gh × S (3)

In formula, P is the water pressure to sluice, and S is the density that contact area ρ is water of sluice and water, and g is acceleration of gravity, and h is the contact degree of depth of sluice and water。After sluice installation, its gravity G is that constant, a coefficientoffrictionμ keep constant substantially。

In sluice (wirerope lock/screw brake) lifting process, the contact degree of depth h of sluice and water is gradually reduced, sluice is subject to the lateral pressure F' of water and also reduces therewith, corresponding downward frictional force f also reduces, now, the lifting force F of sluice is formed one group of equilibrant (as shown in Figure 1) by downward frictional force f, sluice gravity G, motor, and when meeting dynamic balance, the tensile force f of sluice is reduced by motor。

In wirerope sluice decline process, sluice self gravitation G is mainly relied on to decline, the contact degree of depth h of sluice and water is gradually increased, sluice is also gradually increased by the lateral pressure F' of water, corresponding upwards frictional force f also increases, and now, upwards the tensile force f of sluice is formed a pair equilibrant (as shown in Figure 2) with sluice gravity G with motor by frictional force f, when meeting equilibrant, the tensile force f of sluice is reduced by motor。

In screw rod sluice decline process, mainly relying on the down thrust F of screw rod to decline, the contact degree of depth h of sluice and water is gradually increased, sluice is also gradually increased by the lateral pressure F' of water, corresponding upwards frictional force f also increases, now, and upwards frictional force f, the screw thread holding power F to sluice_?, motor the down thrust F of sluice, sluice gravity G are formed a pair equilibrant (as shown in Fig. 1-Fig. 7), when meeting equilibrant, the thrust F of sluice is increased by motor。

When sluice (wirerope lock/screw brake) starts to promote, F > G+f should be met, F=G+f should be met after sluice moves upward to keep sluice to be at the uniform velocity lifted up。After sluice motion puts in place, motor stops, and lifting force F disappears, now, and the holding power of screw rod or the tensile force f of wirerope_lBalance with gravity G, meet F_l=G, sluice is static。

When wirerope sluice begins to decline, G > F+f should be met, F+f=G should be met after sluice moves downward to keep sluice uniform descent。After sluice motion puts in place, motor stops, and lifting force F disappears, now, and the tensile force f of wirerope_lBalance with weight G, meet F_l=G, sluice is static, if sluice drops to base plate completely, then the base plate holding power F' to sluice_?=G。

When screw rod sluice begins to decline, G+F > F should be met_?+ f, should meet F after sluice moves downward_?+ f=F+G is to keep sluice uniform descent。After sluice motion puts in place, motor stops, and down thrust F disappears, now, and the holding power F of screw rod_?Balance with weight G, meet F_?=G, sluice is static。

The load of sluice equipment becomes positive correlation with stress, if the shock loading when load of sluice equipment is H, starts is H₀, performance load be H'(include sluice promote load H_uWith sluice decline load H_d)。Screw rod sluice is for being rigidly connected, and starting instantaneous water brake apparatus load at sluice will suddenly change to H=H from H=0₀, after equipment starts, load will by H₀Change to a more stable value H'；Wirerope lock is for flexibly connecting, and when sluice promotes and starts, wirerope tension needs certain time, and the concrete time is relevant with the tightness of wirerope。Sluice enters the load value H impact by many factors of operation phase, if its change function is that in H=f (h, μ, S) formula, h is the degree of depth that contacts of sluice and water, μ is the frictional force of sluice and track, and S is the contact area of sluice and water；After sluice runs and puts in place or receive other halt commands, load will be become 0 in the short period of time from H。When the contact degree of depth of sluice and water is peak level, the lateral pressure that sluice is subject to is maximum, and the frictional force between sluice and track is maximum, if now maximum load is H_max(maximum load when maximum load is divided into maximum load during lifting with decline, if maximum load is H when promoting_umax, during decline, maximum load is H_dmax)。

Sluice starts moment, and screw brake, wirerope lock all can have a shock loading H₀, H₀Can mode calculated below draw。To be n, angular velocity be if sluice quality is m, the motor actual output speed after differential mechanism w, linear velocity are v, attack time is t₁, the radius of gyration be r。By formula v=wr；F=ma；V_t=v₀+ at can obtain, and has when sluice is by static startup:

v₀=0 (4)

V=v_t=at₁(5)

H₀=F (6) so, according to sluice difference running status stressing conditions, shock loading when screw brake, wirerope lock start meets:

F-G-f=ma (7)

$H_0=ma+G+f=\frac{6nr}{t_1}\×m+G+f=\frac{6nr}{t_1}\×m+G+\mathrm{\μ}\×\mathrm{\ρ}gh\×S---\left(8\right)$

In like manner can obtaining, shock loading when screw brake declines meets:

G+F-F_?-f=ma (9)

When wirerope sluice declines, full shock loading foot:

G-F-f=ma (11)

$H_0=G-f-ma=G-\mathrm{\μ}\×\mathrm{\ρ}gh\×S-\frac{6nr}{t_1}\×m---\left(12\right)$

From the foregoing, when sluice starts lifting, shock loading H₀Bigger than normal compared with performance load；When screw brake declines, shock loading H₀Bigger than normal compared with performance load；When wirerope lock declines, shock loading H₀Less than normal compared with performance load。

When sluice runs, theory load H is variable quantity, change functional relation is: H=f (h, μ, S), in sluice lifting process, along with the reduction contacting the degree of depth of sluice with water, the lateral pressure that sluice is subject to reduces, and downward frictional force also reduces, motor load also reduces, load H when sluice promotes_uFunctional relation is represented by:

H_u=f (h, μ, S)=f+G=μ F'+G=μ × ρ gh × S+G (13)

When sluice declines, wirerope sluice can be divided into again to decline and screw rod sluice two kinds of situations (time actually used, sluice type has been determined as one of wirerope sluice or screw rod sluice, can be calculated according to fixed sluice type) of decline。

In wirerope sluice decline process, that rely primarily on is sluice own wt G, now direction is upwards, the lateral pressure being subject to along with sluice in decline process increases, frictional force upwards also increases, from sluice stress analysis it can be seen that now the pulling force of motor be gradually decreased, wirerope sluice decline time load H_dFunctional relationship is represented by:

H_d=f (h, μ, S)=G-f=G-μ F'=G-μ × ρ gh × S (14)

In screw rod sluice decline process, that rely primarily on is the downward thrust F of screw rod, now direction is upwards, the lateral pressure being subject to along with sluice in decline process increases, frictional force upwards also increases, from sluice stress analysis it can be seen that now the thrust of motor be just gradually increased, screw rod sluice decline time load H_dFunctional relationship is represented by:

H_d=f (h, μ, S)=F_?+ f-G=F_?+ μ F'-G=F_?+μ×ρgh×S-G(15)

When sluice stops, due to the effect of sluice braking mechanism, sluice equipment load will be reduced to rapidly 0。

As it has been described above, the load change curve in sluice running can be drawn according to the stress of sluice, loading analysis, the load change curve chart of sluice sluice motor as shown in Figure 2, time period 0-t in figure₁For electric motor starting stage, t₁-t₂For motor operation phase, t₂-t₃For motor stop phase, wirerope lock is for flexibly connecting, and after startup, power conduction needs certain period of time (in Fig. 2-7 time period 0-t₀), in this time period, the load of sluice equipment is equivalent to zero load, and when the moment of wirerope tension, sluice equipment can be subject to a bigger shock loading H₀。

Accompanying drawing illustrates:

Below in conjunction with accompanying drawing, a kind of sluice overload protection arrangement of the present invention is described further。

Fig. 1 is sluice of the present invention (wirerope/screw brake) stress schematic diagram when promoting。

Fig. 2 is sluice of the present invention (wirerope lock) stress schematic diagram when dropping。

Fig. 3 is sluice of the present invention (screw brake) stress schematic diagram when declining。

The schematic diagram of sluice equipment load change curve when Fig. 4 is screw brake of the present invention lifting。

The schematic diagram of sluice equipment load change curve when Fig. 5 is screw brake of the present invention decline。

The schematic diagram of sluice equipment load change curve when Fig. 6 is wirerope lock of the present invention lifting。

The schematic diagram of sluice equipment load change curve when Fig. 7 is wirerope lock of the present invention decline。

Fig. 8 is the system structure schematic diagram of the present invention

Fig. 9 load cell signal modulate circuit figure of the present invention。

Figure 10 is sluice motor main circuit control circuit of the present invention, alarm control circuit。

Figure 11 is signal processing flow figure of the present invention。

In figure: 1 single-chip microcomputer, 2 load cell signal modulate circuits, 3 load transducers, 4 keyboards, 5 lock level sensors, 6 level sensors, 7 LCD display, 8 relays, the 9 main power supply circuits of sluice, 10 warning circuits。

Detailed description of the invention:

This sluice load protection device adopts 40 pin STC12C5A60S2 single-chip microcomputers, selects 11.0592MHz crystal oscillator, and this single-chip microcomputer has 32 I/O mouths, 2 serial ports；Load transducer selects TJN-4 dynamic torque sensor, accuracy of detection height, good stability, strong interference immunity, it is possible to high rotating speed long-play；Lock level sensor selects KS-10 type digital transducer, and this sensor is 10 is Gray code output；Level sensor selects MP4700, and this type sensor is RS485 communication mode；LCD selects YB12232 type, and this liquid crystal display screen provides serial communication port, built-in GB code simplified form of Chinese Character font storehouse, can show picture, character and Chinese character。Load cell signal is connected with single-chip microcomputer P1.6 (ADC6) after load cell signal modulate circuit (be filtered, amplify, amplitude limit), carries out A/D conversion and draws real-time load value；Single-chip microcomputer P2.3 to P2.7 and P3.4, P3.5, as keyboard interface, form 3 × 4 matrix keyboards, input for parameter；Lock level sensor is connected with single-chip microcomputer P0 mouth and P1.0, P1.1 and carries out the collection of lock position；Level sensor is connected with MAX485, and microcontroller serial port 2 is connected with MAX485, it is achieved water level signal collection；LCD display adopts SPI mode, and chip selection signal, serial data, serial clock are connected with single-chip microcomputer P2.0, P2.1, P2.2 mouth respectively；P3.7 is set to recommend output, drives control circuit, controls main circuit break-make；Warning circuit is recommended output by P3.6 and is driven。

The load signal modulate circuit of the present invention as shown in Figure 9, adopts amplifier LT1101 and OP27 to form load cell signal and amplifies modulate circuit, A₁For amplifier TL1101, this amplifier is low-power consumption, and accurate instrumentation amplifier, gain is fixed as 10 or 100；R₁、R₂、A₁Composition differential amplifier circuit；A₂For amplifier OP27, this amplifier is low-power consumption, high reliability precision amplifier, A₂、R₄、R₅、R₆、C₅Composition series voltage negtive backword amplifying circuit, its gainAccording to actual needs, by regulating variable resistance R₄Change gain size；C₂、R₃Composition low-pass filter circuit；C₃、C₄For decoupling capacitor；C₆、D₁For amplitude limiter circuit。

The driving control circuit of the present invention as shown in Figure 10, R₁With R₂, R₃With R₄Composition pullup drive circuit, drives relay audion Q₁、Q₂, control relay K A1 and alarm BZ1 by audion break-make；Relay K A1 controls A.C. contactor KM1, and during load exception, control core output drives relay K A1 conducting, and KM1 turns on, and KM1 normally-closed contact is opened, and main circuit disconnects, simultaneously alarm equipment alarm。

Sluice runs can be divided into six stages, be respectively as follows: when sluice promotes the startup stage of carrying lock, carry the lock stage under water, the barrier gate that carries when lock stage and sluice decline in the air startup stage, aerial barrier gate stage, under water barrier gate stage。If the maximum load respectively H that each stage is corresponding_u0、H_u1、H_u2、H_d0、H_d1、H_d2, known according to described sluice force analysis:

$H_{u0}=ma+G+f=\frac{6nr}{t_1}\×m+G+f=\frac{6nr}{t_1}\×m+G+\mathrm{\μ}\×\mathrm{\ρ}gh\×S$

$H_{d0}\≈ma+G=\frac{6nr}{t_1}\×m+G=\frac{6nr}{t_1}\×m+G$

When sluice promotes

H_u1=f (h, μ, S)=f+G=μ F'+G=μ × ρ gh × S+G

H_u2=f (h, μ, S) ≈ G

Time actually used, desirable H_u2=G。Owing to wirerope sluice is different with screw rod sluice stressing conditions, according to described force analysis it can be seen that wirerope sluice decline time

H_d1=f (h, μ, S) ≈ G

H_d2=f (h, μ, S)=G-f=G-μ F'=G-μ × ρ gh × S

Time actually used, desirable H_d1=G。When screw rod sluice declines

H_d1=f (h, μ, S) ≈ F_?-G≈F_?-G

H_d2=f (h, μ, S)=F_?+ f-G=F_?+ μ F'-G=F_?+μ×ρgh×S-G

In gate debugging process, according to sluice type, can record according to described computing formula or estimate the maximum load value drawing each stage。By keyboard, sluice run maximum load corresponding to each stage, operation time input single-chip microcomputer memorizer。Sluice runs real-time load value, sets load value, runs the time in liquid crystal screen display。When gate runs, according to lock position, water level conditions, it is judged that the operation phase residing for gate, simultaneously to should the load limitation value in stage。When load is beyond setting value, single-chip microcomputer sends halt instruction and controls relay deenergization main circuit, simultaneously drives warning circuit and sends alarm。

According to the stressing conditions of sluice, sluice equipment load mutation analysis, in debugging process, it is necessary to measure the startup load H of sluice₀, start load H including carrying lock_u0Load H is started with barrier gate_d0；Calculate and carry lock maximum load H in the air_u1With aerial barrier gate maximum load H_d1；Calculate the maximum load H of barrier gate under water_max, including carrying lock load H under water_u2Barrier gate load H under water_d2；Measure sluice and start impact section time t₁, sluice runs time Δ t₁(Δt₁=t₂-t₁), the dwell time Δ t of sluice₂(Δt₂=t₃-t₂)。

By H₀(H_u0、H_d0)、H_u1、H_d1、H_max(H_u2、H_d2)、t₁、Δt₁、Δt₂Arranged by keyboard and be stored in single-chip microcomputer memorizer, after equipment runs, real-time load, operation time are compared with setup parameter, completes load measurement and judgement。

Sluice startup moment can produce greater impact power, and sluice equipment has bigger shock loading H₀, but this impact process time is shorter, and program adopts delay process mode, and sluice equipment is introduced into delay process program when starting, and delay duration is t₁, at 0-t₁In time, it is judged that the situation of change of load H in real time。If there being H > H in latency period₀, then judging that sluice equipment starts abnormal, control core sends halt instruction, and the output of I/O mouth drives control circuit, disconnects sluice device power supply (DPS) major loop；If H is not more than H₀, then start。

After sluice equipment starts, load transducer Real-time Collection sluice equipment load value H, by the performance load H' drawn in real-time load value and debugging process and maximum load H_maxCompare。Sluice promotes or in decline process, the load of sluice equipment is to be held essentially constant or have less reduction trend, and target phase, real-time load H should fluctuate around H'。As H > > H_maxTime, illustrate sluice running is likely to be stuck；These situations all illustrate that sluice running status is abnormal, and control core sends halt instruction, and the output of I/O mouth drives drive circuit, disconnects sluice device power supply (DPS) major loop。

While carrying out load judgement, time-out is adopted to judge, if t is > t₁Rear also have H=H₀；Sluice is that the time is more than Δ t in the operation phase₁；After halt instruction sends, load H drops to the time of 0 much larger than Δ t₂；In these situations, need to again send control instruction, disconnect sluice device power supply (DPS) major loop in time。

The present invention takes software and hardware measure to prevent periphery electromagnetic environment from disturbing, hardware adopts hardware filtering, adopt average value filtering, middle position value filtering to combine when software design, can effectively remove the sensor signal exceptional value that outside electromagnetic interference causes, ensure to gather data accurate, it is ensured that precise control is errorless。

Claims (9)

1. a sluice overload protection method; it is characterized in that: detect the sluice load in sluice running, lock position and water level; record is when front brake position and a upper moment lock position, it is judged that sluice running status also calculates theoretical load, and described judgement sluice running status also calculates the method for theoretical load and is:

(1) when front brake position and upper moment lock bit comparison described in, when lock position increases, it is judged that sluice is in lifting state, can be calculated theory load H by following formula_u:

H_u=f (h, μ, S)=f+G=μ F'+G=μ × ρ gh × S+G

(2) when front brake position and upper moment lock bit comparison described in, when lock position reduces, it is judged that sluice is in decline state, and now, theory load is relevant with sluice type；

When wirerope lock declines, theory load H can be calculated by following formula_d:

H_d=f (h, μ, S)=G-f=G-μ F'=G-μ × ρ gh × S

When screw brake declines, theory load H can be calculated by following formula_d:

H_d=f (h, μ, S)=F_?+ f-G=F_?+ μ F'-G=F_?+μ×ρgh×S-G

H in formula_uPromoting for sluice is theory load, H_dTheory load when declining for sluice, S are the contact area m of sluice and water², ρ be the density Kg/m of water³, g be acceleration of gravity m/s², h be contact degree of depth m, the h' of sluice and water be depth capacity m, the F that sluice contacts with water_?Be coefficient of friction, F' for screw thread to be sluice gravity N, f to holding power N, G of sluice be sluice and the frictional force N of track, μ it is the water lateral pressure N to sluice；

By sluice real load H and described theory load H_uOr H_dCompare, as H > > H_uOr H > > H_dTime, implement sluice overload protection。

2. sluice overload protection method according to claim 1, it is characterised in that: the theoretical maximum load of described theory load is calculated；

Theoretical maximum load H when sluice promotes can be calculated by following formula_umax:

H_umax=f (h, μ, S)=f+G=μ F'+G=μ × ρ gh' × S+G

Theoretical maximum load H when wirerope sluice declines can be calculated by following formula_dmax:

H_dmax=f (h, μ, S)=G-f=G-μ F'=G-μ × ρ gh' × S

Theoretical maximum load H when screw rod sluice declines can be calculated by following formula_dmax:

H_dmax=f (h, μ, S)=F_?+ f-G=F_?+ μ F'-G=F_?+μ×ρgh'×S-G

H in formula_umaxPromoting for sluice is theory load, H_dmaxTheory load when declining for sluice, S are the contact area m of sluice and water², ρ be the density Kg/m of water³, g be acceleration of gravity m/s², h be contact degree of depth m, the h' of sluice and water be depth capacity m, the F that sluice contacts with water_?Be sluice gravity N, f to holding power N, G of sluice be sluice for screw thread it is the water lateral pressure N to sluice with the frictional force N of track, F'；

Theoretical maximum load H when sluice real load H is promoted with described sluice_umaxOr theoretical maximum load H during sluice decline_dmaxCompare, as H > H_umaxOr H > H_dmaxTime, implement sluice overload protection。

3. a sluice overload protection arrangement, it is characterised in that: it is made up of single-chip microcomputer (1), load cell signal modulate circuit (2), load transducer (3), keyboard (4), lock level sensor (5), level sensor (6), LCD display (7), relay (8), the main power supply circuits of sluice (9) and warning circuit (10)；Described single-chip microcomputer (1) electrically connects with load cell signal modulate circuit (2), and described load transducer (3) electrically connects with load cell signal modulate circuit (2)；Described single-chip microcomputer (1) electrically connects with keyboard (4)；Described single-chip microcomputer (1) electrically connects with lock level sensor (5)；Described single-chip microcomputer (1) electrically connects with level sensor (6)；Described single-chip microcomputer (1) electrically connects with LCD display (7)；Described single-chip microcomputer (1) electrically connects with relay (8)；The main power supply circuits of described sluice (9) electrically connects with relay (8)；Described warning circuit (10) electrically connects with single-chip microcomputer (1)。

4. sluice overload protection arrangement according to claim 3; it is characterized in that: the output signal of described load transducer (3) is voltage signal; described voltage signal is as the input signal of described load cell signal modulate circuit (2), and this signal is amplified by described load cell signal modulate circuit (2), filters, be connected with described single-chip microcomputer (1) after amplitude limit。

5. the sluice overload protection arrangement according to claim 3 or 4, it is characterised in that: described single-chip microcomputer (1) has 32 I/O mouths, 2 serial ports。

6. sluice overload protection arrangement according to claim 5, it is characterised in that: described keyboard (4) is connected with the I/O mouth of described single-chip microcomputer (1)；Described lock level sensor (5) is connected with the I/O mouth of described single-chip microcomputer (1)。

7. sluice overload protection arrangement according to claim 5, it is characterised in that: described level sensor (6) is connected by the serial ports 2 of MAX485 with described single-chip microcomputer (1)。

8. sluice overload protection arrangement according to claim 5, it is characterised in that: described LCD display (7) adopts SPI mode to be connected with the I/O mouth of described single-chip microcomputer (1)。

9. sluice overload protection arrangement according to claim 5; it is characterized in that: be set to recommend output by the I/O mouth that described single-chip microcomputer (1) is connected with described relay (8), warning circuit (10); described recommend output drive described relay (8) and warning circuit (10) respectively, described relay (8) control the main power supply circuits of sluice (9) break-make。