TRANSLATABLY MOBILE BATCH CHARGER

Abstract

A batch charger includes a barrel defining a direction X of charging a glass forming batch into the furnace, and a mechanical assembly provided with a member for conveying the batch to the furnace in the charging direction X, this conveying member being at least partially arranged in the barrel, and a motorized unit for driving the conveying member. The batch charger includes a mechanical assembly translatably mobile relative to the barrel, in the charging direction X.

Claims

1. A batch charger for charging a glass forming batch into a glass furnace, said batch charger comprising: a barrel defining a charging direction of the batch into the furnace, and a mechanical assembly provided with: a conveying member for conveying the batch to the furnace in the charging direction, said conveying member being at least partially arranged in the barrel, and a motorized unit for driving said conveying member, wherein the mechanical assembly is translatably mobile relative to the barrel, in the charging direction.

2. The batch charger as claimed in claim 1, wherein the barrel is rigidly connected to a chassis relative to which the mechanical assembly is translatably mobile.

3. The batch charger as claimed in claim 1, wherein the mechanical assembly is configured to be translated manually.

4. The batch charger as claimed in claim 1, further comprising a motorized unit for translating the mechanical assembly.

5. The batch charger as claimed in claim 1, further comprising a measurement device for measuring at least one value of a physical variable affected by the operation of the batch charger.

6. A glass former melting installation comprising: a glass former melting furnace provided with a charging orifice located in the tank wall, and a batch charger as claimed in claim 1, one end of the barrel of the batch charger opening into the charging orifice.

7. The installation as claimed in claim 6, further comprising a tubular charging head arranged downstream of the barrel and fixed to the outer wall of the furnace tank, level with the charging orifice, said charging head being provided at the end thereof away from the furnace with a slide damper, the damper plate of which is mobile between a closed position, in which the damper plate closes off access to the inside of the furnace, and an open position, in which this access is freed.

8. A method comprising melting glass formers with the installation as claimed in claim 6.

9. A method for controlling a batch charger as claimed in claim 1, on the basis of at least one measured value of a physical variable affected by the operation of the batch charger, said control method comprising: comparing said measured value with at least one threshold value, sending an instruction to translate the mechanical assembly, and controlling the motorized unit for translating the mechanical assembly.

10. The control method as claimed in claim 9, wherein the physical variable measured is the current intensity of the motor of the motorized unit for rotating a worm screw for conveying the batch to the furnace, and wherein said threshold value is initially between 10 and 50% of the maximum permissible current intensity of said motor.

11. The control method as claimed in claim 9, wherein a command to translate the mechanical assembly downstream of the theoretical cutting plane of the damper plate is coupled to the arrangement thereof in an open position.

12. The control method as claimed in claim 9, wherein the physical variable measured is the temperature inside the barrel at the furthest downstream end thereof, the control order sent being to translate the conveying member backwards when the temperature measured is equal to or greater than a temperature threshold value.

13. A system for controlling a batch charger as claimed in claim 1, comprising a processing module suitable for: comparing at least one value of a physical variable affected by the operation of the batch charger with at least one threshold value, sending an instruction to translate the mechanical assembly.

14. A computer program downloadable from a communication network and/or recorded on a recording medium suitable for being read by a computer and/or run by a processor, comprising an instruction code for implementing a control method as claimed in claim 9.

15. A non-transitory computer-readable recording medium on which a computer program is recorded, said computer program comprising instruction codes for implementing a control method as claimed in claim 1.

16. The batch charger as claimed in claim 5, wherein the physical variable is selected from: the torque supplied by the motorized drive unit of said conveying member, the current intensity of the motor of said motorized drive unit, the temperature inside the barrel at the furthest downstream end thereof, and the concentration of combustion gases inside the barrel.

17. The installation as claimed in claim 6, wherein the charging orifice is below the theoretical level of the liquid glass defined by the position of the liquid glass spout.

18. The method as claimed in claim 9, wherein said physical variable is selected from: the torque supplied by the motorized drive unit of said conveying member, the current intensity of the motor of said motorized drive unit, and the temperature inside the barrel at the furthest upstream end thereof.

19. The control method as claimed in claim 10, wherein the threshold value is initially between 10 and 30% of the maximum permissible current intensity of said motor.

20. The control method as claimed in claim 19, wherein the threshold value is initially between 14 and 16% of the maximum permissible current intensity of said motor.

Description

[0079] Further features and advantages of the invention are described below, with reference to the drawings, in which:

[0080] FIG. 1 is a cross-sectional schematic view of a glass former melting installation according to a particular embodiment of the invention;

[0081] FIG. 2 is a kinematic diagram of a batch charger according to a particular embodiment of the invention;

[0082] FIG. 3 is a schematic representation of a system for controlling a batch charger according to a particular embodiment of the invention;

[0083] FIG. 4 is a flow diagram showing the successive steps of a method for controlling a batch charger according to a particular embodiment of the invention.

[0084] Identical reference signs in the different figures denote similar or identical elements.

[0085] According to a particular embodiment and as shown in FIG. 1, the invention relates to a glass former melting installation 10 comprising:

[0086] a glass former melting furnace 3 provided with a charging orifice in the tank wall, and

[0087] a batch charger 1 according to the invention, one end of the barrel 4 of the batch charger 1 opening into the charging orifice so that the glass formers can be introduced into it.

[0088] According to the embodiment shown in FIG. 1, the charging orifice is located below the theoretical level of the liquid glass defined by the position of the liquid glass spout. This is known as a submerged type batch charger, to which the invention more particularly relates, given the risks of the back flow of liquid glass into the barrel 4 and the pressure exerted by the liquid glass on the plug, as these two factors significantly increase the resistance exerted against the work of the conveying member 6, and therefore the risks of jamming and/or damage.

[0089] According to an alternative embodiment, charging may however take place above the theoretical level of liquid glass, along a division wall and/or gable wall of the furnace 3.

[0090] The invention also relates to a batch charger 1 comprising:

[0091] a barrel 4 defining a direction X of charging a glass forming batch 2 into the furnace 3, and

[0092] a mechanical assembly 5 provided with: [0093] a member 6 for conveying the batch 2 to the furnace 3 in the charging direction X, this conveying member 6 being at least partially arranged in the barrel 4, and [0094] a motorized unit 7 for driving said conveying member 6.

[0095] In particular, the mechanical assembly 5 is translatably mobile relative to the barrel 4, in the charging direction X.

[0096] A batch charger 1 according to the invention makes it possible, via the translation of the mechanical assembly 5 relative to the barrel 4, to maintain this resistance value, and therefore the corresponding value of the motorized drive unit 7 torque, within an intermediate range of values making it possible to overcome the jamming of the drive motor and limit the risks of damage thereto and/or to the conveying member 7, while preventing the generation of instabilities in the melting process and back flows of gas.

[0097] According to the particular embodiments shown in FIGS. 1 and 2, the batch charger 1 comprises a barrel 4 inside which is housed a worm screw 6 rotatably mobile about the charging axis X. This worm screw 6 therefore acts as the member for conveying the batch 2 to the furnace 3. It must be noted that according to an alternative embodiment, the conveying member 6 can take the form of a piston translatably mobile in the charging direction X, or any other type of conveying member known from the prior art. Regardless of the type of conveying member 6, it is rotated/translated by a motorized unit 7 comprising one or more motors. The group formed by this conveying member 6 and the motorized drive unit 7 forms a mechanical assembly 5. A hopper on the barrel 4 makes it possible to introduce the raw material batch 2.

[0098] According to a particular embodiment (not shown), the batch charger head also comprises a slide damper and a tubular part for connection to the furnace. The slide damper comprises a fixed part and a mobile part, called the damper plate. A tubular connecting part is fixed to the fixed part of the damper, the internal surface of which widens slightly towards the furnace, only the tank wall of which is shown. The tubular connecting part is inserted into the charging orifice. The connecting part and the damper plate are each traversed by a system of internal pipes enabling the circulation of a coolant. When the damper plate is in the closed position, it closes off access to the inside of the furnace.

[0099] As shown in FIG. 1, the barrel 4 of the batch charger 1 is rigidly connected to a chassis 8 relative to which the mechanical assembly 5 is translatably mobile. More specifically, and as shown by the kinematic diagram in FIG. 2, the mechanical assembly 5 is fixed to a horizontal panel (not shown) that itself slides in the charging direction X, along side rails 14 rigidly connected to the chassis 8. The mechanical assembly 5 is translated relative to the chassis by means of a machine screw 15. It will be understood that according to alternative embodiments, the translational mobility of the mechanical assembly 5 relative to the barrel 4 can be implemented via any arrangement and/or type of mechanical connection known from the prior art, without however leaving the scope of the invention.

[0100] According to a particular embodiment of the invention (not shown), the translation of the mechanical assembly 5 is manually controlled, by means of a handwheel enabling the rotation of the machine screw 15. According to alternative embodiments, such translation can be controlled by means of a crank or any other known mechanical device with a similar function.

[0101] According to an alternative embodiment shown in FIG. 1, the translation is controlled by means of a motorized translation unit 9. An operator can thus be fully or partially assisted for the positioning of the mechanical assembly 5.

[0102] In order to guide decision-making regarding the translation of the mechanical assembly 5 in the barrel 4, the batch charger 1 is provided with a plurality of sensors including:

[0103] a sensor to measure the torque supplied by the motorized drive unit 7,

[0104] a temperature sensor positioned inside the barrel 4 at the end thereof intended for positioning close to the furnace, which makes it possible to detect any back flow of liquid glass and/or the start of pyrolysis in the worm screw 6,

[0105] a device for measuring the concentration of carbon dioxide and/or carbon monoxide from combustion, inside the barrel 4.

[0106] According to a particular embodiment, the different sensors are coupled to a human-machine interface (not shown) suitable for communicating the measured values to an operator. The operator can then decide whether or not to modify the position of the mechanical assembly 5 relative to the barrel 4, manually or with the assistance of a motorized translation unit 9.

[0107] According to an alternative embodiment shown in FIG. 1, the translation of the mechanical assembly 5 is automated, via a control system 20 described herein, which offers the possibility of automatically coupling the position of the screw 6 to the torque measured, and therefore continuously adjusting the batch charger 1 to the charging conditions, according to a control method described herein.

[0108] Thus, the invention also relates to a system 20 for controlling a batch charger 1 as described herein. As shown in FIG. 3, such a control system 20 comprises a processor 21 acting as a processing module, a storage unit 22, an interface unit 23 and measurement sensors 24, these elements being interconnected by a bus 25.

[0109] The processor 21 controls the motorized unit 9 for translating the mechanical assembly 5. The storage unit 22 stores at least one program to be run by the processor 21, and various data, including the data collected by the measurement sensors 24, the parameters used by calculations performed by the processor 21, and the intermediate data of the calculations performed by the processor 21. The processor 21 can be made up of any known or appropriate hardware or software, or of a combination of hardware and software. The storage unit 22 can be made up of any appropriate storage or suitable means for storing the program and the data in a computer-readable manner. The program ensures that the processor 21 implements a control method as described herein.

[0110] The interface unit 23 provides an interface between the control system 20 and an external device. The interface unit 23 can in particular be connected to the external device via a cable or a wireless connection. In this embodiment, the external device can be a motorized unit 9 for translating the mechanical assembly 5 and/or another component of the batch charger 1. In this case, the values measured by the sensors 24 can be entered into the system 20 by means of the interface unit 23, then stored in the storage unit 22.

[0111] Although a single processor 21 is shown in FIG. 3, a qualified person will understand that such a processor can comprise different modules and units implementing the functions executed by the control system 20. These functions can also be performed by a plurality of interconnected processors 21.

[0112] FIG. 4 is a flow diagram showing the successive steps of a method for controlling a batch charger 1 according to a particular embodiment.

[0113] During a first step (step S1), the following variables are compared: [0114] the value of the current intensity of the motor of the motorized unit 7 for rotating the worm screw 6, proportional to the torque of this motor, is compared to a threshold value set at 15% of the maximum permissible current intensity of the motor, which in this case corresponds to an optimum operating value to which the operator wishes to remain close, with a 5% margin of deviation, [0115] the temperature measured inside the barrel 4, at the furthest upstream end thereof, is compared to a temperature threshold value set at 50 C., which in this case corresponds to an extreme temperature that the operator wishes to avoid.

[0116] Priority is given in the control method to maintaining this temperature at the end of the barrel 4 below the threshold value of 50 C.

[0117] In practice, if the motor current intensity value measured (step S1) is greater than 20% of the maximum permissible current intensity, at a temperature of less than 50 C., the order is given (step S2) by the processor 21 to move the mechanical assembly 5 forwards (step S3) 1 cm towards the furnace 3. The motorized unit 9 for translating the mechanical assembly 5 is then controlled (step S3) according to this instruction.

[0118] Conversely, if the motor current intensity value measured (step S1) is less than 10% of the maximum permissible current intensity, at a temperature of less than 50 C., the order is given (step S2) to move the mechanical assembly 5 backwards (step S3) 1 cm.

[0119] However, if the temperature measured (step S1) is greater than or equal to 50 C., an order (step S2) is given prohibiting the movement of the mechanical assembly 5 forwards (step S3), regardless of the motor current intensity value measured (step S1). The only commands authorized in this case are maintaining the position of the mechanical assembly 5 and the backwards movement thereof.

[0120] Similarly, the command to translate the mechanical assembly 5 downstream of the theoretical cutting plane of the damper plate is coupled to the arrangement thereof in the open position, in order to prevent any contact between the worm screw 6 and the damper plate and therefore any damage that might result from this.

[0121] This control method is reiterated at a frequency of 10 minutes.

[0122] It must be noted that according to alternative embodiments, this control method can be implemented on the basis of different types of measurement, different threshold values, and/or at different iteration frequencies.