CN203882202U - A powder flow rate control system and a material flow meter - Google Patents

Abstract

The utility model provides a material flow meter comprising a rotating shaft, a detection plate, a balance weight, an angular displacement sensor and bearings. The detection plate and the balance weight are connected to the two sides of the rotating shaft. When the rotating shaft is arranged horizontally, the gravity torque of the detecting plate and the gravity torque of the balance weight are equal. The rotating shaft is provided with the bearings used for fixing the rotating shaft and is provided with the angular displacement sensor used for detecting the rotating angle of the rotating shaft and sending out detection signals. The material flow meter has the advantages that the impact force generated when a measured medium impacts on the detection plate and the forced generated when powder slides downward on the detection plate are converted to electric signals which are input in a flow rate integrating instrument, the operation for the flow rate of freely-falling material can be achieved based on the theorem of momentum, the instantaneous flow rate and the integrated flow rate can be displayed and the opening degree of a material discharging valve can be controlled through a PLC, so that the material delivery is stable and the material delivery quantity can be calculated accurately.

Description

A kind of control system of powder flow and material flowmeter thereof

Technical field

The utility model relates to a kind of measuring apparatus, relates in particular to a kind of control system and material flowmeter thereof of powder flow.

Background technology

In gypsum board manufacture technique, gesso, starch, adjuvant etc. need to be uniformly mixed into type according to strict ratio, gesso is controlled discharge quantity by outlet valve and the belt conveyer scale of bin bottom, fluctuation ratio is larger, easily cause chapelet and pipe conveying reamer putty, have a strong impact on continuous production.Along with company new production line shaping speed promotes, requires more accurate to the discharge quantity control of gesso, minimizing blanking undulatory property.

Utility model content

The application controls discharge quantity for the outlet valve by bin bottom of the prior art and belt weigher, and fluctuation ratio is larger, easily causes chapelet and pipe conveying reamer putty, has a strong impact on the problem of continuous production, thereby proposes a kind of material flowmeter.

The application provides a kind of material flowmeter, and it comprises turning axle, check-out console, counterweight, angular displacement sensor and bearing;

The both sides of described turning axle are connected with respectively described check-out console and counterweight, when described turning axle horizontal positioned, and the gravity torque balance of the gravity torque of described check-out console and described counterweight,

Described turning axle is provided with the bearing for fixing described turning axle;

Described turning axle is provided with described angular displacement sensor, and described angular displacement sensor is for detection of the anglec of rotation of described turning axle, and sends out detection signal.

Preferably, described turning axle is also provided with the rotary damper that strengthens angular motion damping.

Preferably, described counterweight is connected with turning axle by connecting rod, and the angle of described connecting rod and check-out console is 120-180 °.

The utility model also provides a kind of control system of powder flow, comprising material flowmeter described above, also comprises feed bin, belt conveyer scale, mozzle and controller,

Described mozzle is arranged on the bottom of feed bin, and described mozzle is provided with outlet valve, the check-out console of described material flowmeter be positioned at the mozzle mouth of pipe under, the below of described material flowmeter is provided with belt conveyer scale,

Detection signal is sent to controller by described angular displacement sensor,

Described controller, for according to the detection signal that receives described angular displacement sensor, controls the pre-feed size of outlet valve.

Preferably, described controller comprises flow integrator and control circuit,

Described flow integrator, for the treatment of the detection signal of angular displacement sensor, and by the electric signal input control circuit corresponding with flow, described control circuit receives the electric signal control outlet valve of described flow integrator for basis.

Preferably, described flow integrator is provided with display screen,

Described display screen, for according to the result of the detection signal of described flow integrator processing angle displacement transducer, display screen shows instantaneous delivery and integrated flow.

Preferably, described material flowmeter also comprises support, and described turning axle is fixed on support by described bearing.

Compared with relevant technologies, the beneficial effect of the utility model embodiment is as follows:

The control system of the powder flow of the utility model embodiment and material flowmeter thereof, the power that the impulse force that measured medium impulse detection plate is caused and powder produce in the time of check-out console down sliding converts electric signal to, input flow rate integrating instrument, based on theorem of momentum realize the powdery to free-falling, the flow of granular solids medium measures, show instantaneous delivery, integrated flux by internal arithmetic, and by the aperture size of programmable logic controller (PLC) controls outlet valve, make blanking stable, accurate measurement discharge quantity.

Brief description of the drawings

Fig. 1 is the schematic diagram of the material flowmeter of the utility model embodiment;

Fig. 2 is the schematic side view of the material flowmeter of the utility model embodiment;

Fig. 3 is that the equalising torque of the material flowmeter of the utility model embodiment is related to schematic diagram;

Fig. 4 is the schematic diagram that the utility model embodiment is arranged on the material flowmeter of feed bin bottom;

Reference numeral: 1-check-out console, 2-turning axle, 3-counterweight, 4-connecting rod, 5-angular displacement sensor, 6-rotary damper, 7-bearing, 8-mozzle,

Embodiment

Hereinafter in connection with accompanying drawing, embodiment of the present utility model is elaborated.It should be noted that, in the situation that not conflicting, the combination in any mutually of the feature in embodiment and embodiment in the application.

The material flowmeter of the utility model embodiment is achieved in that sees that, shown in Fig. 1,2 and 3, it comprises check-out console 1, turning axle 2, counterweight 3, angular displacement sensor 5 and bearing 7; The both sides of described turning axle 2 are connected with respectively described check-out console 1 and counterweight 3, when described turning axle 2 horizontal positioned, and the gravity torque balance of the gravity torque of described check-out console 1 and described counterweight 3, turning axle 2 is provided with the bearing 7 for fixing described turning axle 2; Turning axle 2 is provided with angular displacement sensor 5, and described angular displacement sensor 5 is for detection of the anglec of rotation of described turning axle 2, and sends out detection signal.Angular transducer can adopt the integrated magnet-sensitive element of high-performance intelligence, and mechanical rotation or angular displacement are converted into electric signal output.

Because actual powder is mobile irregular, there is certain undulatory property, so turning axle 2 is also provided with the rotary damper 6 that strengthens angular motion damping, can reduce blanking fluctuation.

Turning axle 2 can be connected with counterweight 3 by connecting rod 4, and counterweight 3 and check-out console 1 are positioned at the both sides of turning axle 2 angled, and the gravity torque of the gravity torque of check-out console 1 and described counterweight 3 easily reaches balance like this.As shown in Figure 2, in order to make turning axle 2 and counterweight 3 holding torque balances, connecting rod 4 can be 120-180 ° with the angle β of check-out console 1, more preferably 150 °.

In another embodiment of the present utility model, a kind of control system of powder flow is also provided, as shown in Figure 4, comprise above-mentioned material flowmeter, also comprise feed bin, belt conveyer scale, mozzle 8 and controller, mozzle 8 is arranged on the bottom of feed bin, mozzle 8 is provided with outlet valve, material flowmeter check-out console 1 be positioned at mozzle 8 mouths of pipe under, the below of described material flowmeter is provided with belt conveyer scale, detection signal is sent to controller by described angular displacement sensor 5, described controller is according to the detection signal that receives described angular displacement sensor 5, control the pre-feed size of outlet valve.

Controller comprises flow integrator and programmable logic controller (PLC).Flow integrator receives the also detection signal of processing angle displacement transducer 5, and the electric signal input programmable logic controller (PLC) corresponding with flow carried out to calculation process, programmable logic controller (PLC) is by using the outlet valve of PID control and Frequency Converter Control mozzle 8, thereby realize the adjusting of pre-feed, make blanking stable, accurate measurement discharge quantity.

As disposable embodiment, controller also can comprise flow integrator and control circuit, control circuit adopts the control circuit of non-programmed logic computing, according to the electric signal of flow integrator, send out control signal to controlling the outlet valve of mozzle 8, control signal can be divided into multiple different signals, thereby makes the variable valve can be in multiple different conditions, thereby regulate the size of aperture, thereby realize the adjusting of giving in advance.

Displacement meter can also comprise display screen, and programmable logic controller (PLC) is used for according to the electric signal of flow integrator, control display screen demonstration instantaneous delivery (be mass rate in the unit interval, or flow velocity) and integrated flow.

Material flowmeter can also comprise support, and turning axle 2 is fixed on support by bearing 7.

Discharge quantity control to gesso is more accurate, can in the middle of bin bottom and belt weighing balance, increase above-mentioned material flowmeter, thereby controls the pre-feed of feed bin, reduces blanking undulatory property.

The metering process of the material flowmeter of the utility model embodiment is as follows:

Powder is through mozzle 8, and by outlet valve, formation Stabilizing Materials stream freely falls, and impacts and on check-out console 1, produces impulsive force F (ignoring the power that powder slides and produces on check-out console 1), and this impulsive force F is directly proportional to the instantaneous delivery of tested powder.Impulsive force F has torque M by check-out console 1 countershaft _f, overcome the moment rotation of counterweight 3.The moment M of counterweight 3 when rotation _pautomatically regulate, when the anglec of rotation of check-out console 1 is α, M _f=M _ptime, check-out console 1 stops operating, and forms blanking stable state, and as shown in Figure 3, the dotted line state of check-out console 1 and counterweight 3 is blanking stable state.The flow of powder is larger, and anglec of rotation α is larger, and wherein concrete relation formula and derivation are as follows:

Material stream initial velocity v ₀, free-falling height h ', impulse detection plate 1 meets theorem of momentum.

Ft＝Δvm，

${\mathrm{mgh}}^{\′}=\frac{1}{2}{\mathrm{mv}}^2-\frac{1}{2}{{\mathrm{mv}}_0}^2$

$q_m=\frac{m}{t}$

Can derive: $F=q_m\cos \mathrm{\α}\sqrt{{2\mathrm{gh}}^{\′}+{v_0}^2},$

Wherein, F-be the impulsive force of powder to check-out console,

The time of t-powder impulse detection plate,

Speed difference after △ v-powder impulse detection plate,

The powder quality of M-impulse detection plate,

Q _mmass rate in the-unit interval,

H '-powder free-falling height, h '=h+X _lsin α, wherein, when h is nothing material, stable state feed opening is to check-out console height, X _lfor the alluvium on check-out console is expected the horizontal range of turning axle,

V ₀-powder initial velocity,

Check-out console deflection angle when α-blanking,

α ₀-counterweight deflection angle,

When without material stream, check-out console 1 and counterweight are in stable state: m ₀gx ₀=m ₁gx ₁cos α ₀

Wherein, m ₀for the weight of check-out console, m ₁for the weight of counterweight, x ₀for check-out console center of gravity is to the distance of rotating shaft center, x ₁for the center of gravity of counterweight and connecting rod is to the distance of rotating shaft center, because counterweight is much larger than the weight of connecting rod, the weight of connecting rod can be ignored, i.e. x ₁can be that the center of gravity of counterweight is to the distance of rotating shaft center.

While having Stabilizing Materials stream impulse detection plate 1, suppose that corner is α≤α ₀, described flow integrator calculates instantaneous delivery according to following formula or mass rate in the unit interval,

$F\frac{X_L}{\cos \mathrm{\α}}+m_{0}g{x}_0\cos \mathrm{\α}=m_{1}g{x}_1\cos ({\mathrm{\α}}_0-\mathrm{\α})$

$q_m=\frac{m_1{\mathrm{gx}}_1\sin {\mathrm{\α}}_0\sin \mathrm{\α}}{X_L\sqrt{2g(h+X_L\sin \mathrm{\α})+{v_0}^2}}$

Powder is in the process of impulse detection plate 1, driven rotary axle 2 rotates, angular displacement sensor 5 changes the angle displacement of turning axle 2 into electric signal, and electric signal is transmitted to flow integrator, flow integrator receive and according to the detection signal of above-mentioned formula manipulation angular displacement sensor 5, and the electric signal input programmable logic controller (PLC) corresponding with flow processed, programmable logic controller (PLC) is according to the aperture of the outlet valve of the signal controlling mozzle 8 of flow integrator, as in the time that turning axle 2 rotational angles are greater than setting value, turn down out valve, reduce the load of outlet valve, cross while being less than setting value when turning axle 2 rotational angles, open large outlet valve, increase the load of outlet valve, thereby realize the adjusting of pre-feed, make blanking stable, accurate measurement discharge quantity.The detection signal of flow integrator monitoring and processing angle displacement transducer 5, and control display screen demonstration instantaneous delivery and integrated flow, carry out the operations such as respective record.

Although the disclosed embodiment of the utility model as above, the embodiment that described content just adopts for the ease of understanding the utility model, not in order to limit the utility model.Technician under any the utility model in technical field; do not departing under the prerequisite of the disclosed spirit and scope of the utility model; can do any amendment and variation what implement in form and in details; but scope of patent protection of the present utility model, still must be as the criterion with the scope that appending claims was defined.

Claims (7)

1. a material flowmeter, is characterized in that, it comprises turning axle, check-out console, counterweight, angular displacement sensor and bearing;

The both sides of described turning axle are connected with respectively described check-out console and counterweight, when described turning axle horizontal positioned, and the gravity torque balance of the gravity torque of described check-out console and described counterweight,

Described turning axle is provided with the bearing for fixing described turning axle,

Described turning axle is provided with described angular displacement sensor, and described angular displacement sensor is for detection of the anglec of rotation of described turning axle, and sends out detection signal.

2. material flowmeter according to claim 1, wherein, described turning axle is also provided with the rotary damper that strengthens angular motion damping.

3. material flowmeter according to claim 1 and 2, wherein, described counterweight is connected with turning axle by connecting rod, and the angle of described connecting rod and check-out console is 120-180 °.

4. a control system for powder flow, is characterized in that, comprising the material flowmeter as described in any one in claim 1-3, also comprises feed bin, belt conveyer scale, mozzle and controller,

Described mozzle is arranged on the bottom of feed bin, and described mozzle is provided with outlet valve, the check-out console of described material flowmeter be positioned at the mozzle mouth of pipe under, the below of described material flowmeter is provided with belt conveyer scale,

Detection signal is sent to controller by described angular displacement sensor,

Described controller, for according to the detection signal that receives described angular displacement sensor, controls the pre-feed size of outlet valve.

5. control system according to claim 4, wherein, described controller comprises flow integrator and control circuit,

Described flow integrator, for the treatment of the detection signal of angular displacement sensor, and by the electric signal input control circuit corresponding with flow, described control circuit receives the electric signal control outlet valve of described flow integrator for basis.

6. according to the control system described in claim 4 or 5, wherein, described flow integrator is provided with display screen,

Described display screen, for according to the result of the detection signal of described flow integrator processing angle displacement transducer, display screen shows instantaneous delivery and integrated flow.

7. according to the control system described in claim 4 or 5, wherein, described material flowmeter also comprises support, and described turning axle is fixed on support by described bearing.