CA1123812A - Device for the release of measured quantities of finely-granular bulk material - Google Patents
Device for the release of measured quantities of finely-granular bulk materialInfo
- Publication number
- CA1123812A CA1123812A CA329,760A CA329760A CA1123812A CA 1123812 A CA1123812 A CA 1123812A CA 329760 A CA329760 A CA 329760A CA 1123812 A CA1123812 A CA 1123812A
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- measuring
- receptacle
- discharge
- pressure
- line
- Prior art date
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Abstract
ABSTRACT OF THE DISCLOSURE
A device for the release of measured quantities of finely granular bulk material, more particularly flour, from at least one transportable silo container, the device comprising a measuring receptacle having a scale with a pneumatic discharge arrangement and a supply line running between the silo container and measuring receptacle and adapted to be acted upon by the negative pressure applied to the measuring receptacle while it is being filled, two scales are provided, the measuring recepta-cles of which are adapted to be connected alternately to the supply line from the silo container, the release of the bulk material from one measuring receptacle taking place while the other measuring receptacle is being filled.
A device for the release of measured quantities of finely granular bulk material, more particularly flour, from at least one transportable silo container, the device comprising a measuring receptacle having a scale with a pneumatic discharge arrangement and a supply line running between the silo container and measuring receptacle and adapted to be acted upon by the negative pressure applied to the measuring receptacle while it is being filled, two scales are provided, the measuring recepta-cles of which are adapted to be connected alternately to the supply line from the silo container, the release of the bulk material from one measuring receptacle taking place while the other measuring receptacle is being filled.
Description
~23~ 12 ~ he invention relates to a device for the release of m~a~ured quantities of finely-granular bulk material, more particularly flour, from at least one transportable silo con-tainer, the said device comprising a measuring receptacle having a scale with a pneumatic discharge arrangement and a supply line running between the silo container and the measur-ing receptacle and adapted to be actuated by the negative pres-sure acting upon the measuring receptacle when it is being filled.
One known arrangement of this kind comprises a single measuring recep-tacle which is built up, with the silo container and the delivery means associated therewith, on a transportable baseplate. This known arrangement is used for, among other things, supplying separate quantities of flour in bakeries.
The disadvantage of this known arrangement is that delivery of the flour is delayed because the delivery means must be halted during the weighing and measuring operations.
Because of these pauses, the output from the kno~n arrangement is relatively low and delivery times are thus lengthened. This increases not only labour costs but vehicle-utilization costs.
It i9 therefore the purpose of the invention to de-sign an arrangement of the type mentioned at the beginning hereof in such a manner as to increase the output thereof con~
siderably.
According to the invention, this purpose is achieved in that two scales are provided, the measuring receptacles of which are adapted to be connected alternately to the supply line running to the silo container, release of the bulk material from the one measuring receptacle taking place while the other measuring receptacle is being filled.
With this arrangement, the output as compared with 38~L2 that of the known arrangement can be doubled at only a slight additional expense, thus having delivery times.
The alternate but simultaneous filliny and ernptying of the two measuring receptacles makes it possible to keep the said receptacles quite small, in spite of the increased output.
As compared with the known arrangement, which uses a relative-ly large m~asuring receptacle, the overall arrangement accord-ing to the invention is relatively small and compact, in spite of the fact that two measuring receptacles are used.
As compared with the known arrangement, the arrange-ment according to the invention also has the advantage that while one measuring receptacle is being emptied, pressure can be built up, after the other measuring receptacle has been filled, for the subsequent emptying thereof. Thus, in addition to shortening the delivery time ta on~e half of that required by the known arrangement, the arrangement according to the inven-tion saves additional time since, with the known arrangement, pressure must first be built up in the measuring receptacle each time before it is emptied.
Although it is, of course, possible to use two blowers, one supplying the negative pressure for filling the measuring receptacles, and one supplying the positive pressure for empty-ing them, it is a great advantage if the negative-pressure line to each measuring receptacle can be connected alternately to the suction side, and the discharge from each measuring receptacle can be connected alternately to the pressure side, of a blower common to both measuring receptacles~ This makes it possible to use one and the same blower ror both filling and emptying, thus providirlg savings in equipment, space and energy, the latter in particular because one side of the blower is not operating in free air.
It is desirable to provide, for control of the alter--~1~3i3~ ;~
nating actuation of the two measuring receptacles, a-t least on~
measuring and indicating unit for e~ch receptacle, which indi-cates when each receptacle is full and triggers the alternate actuation of the said measuring receptacles, since -this makes very accurate control possibLe. A particularly simple and advantageous design is obtained by providing each measuring and indicating unit with a zero and a maximum setting, the emptying of the relevant measuring receptacle being initiated as soon as the measuring and indicating unit thereof is at the maximum setting and that of the other receptacle is at the zero ~etting.
This ensures that the emptying of the filled receptacle starts only when the other measuring receptacle has been completely emptied, which is important because the filling operation generally takes less time than the emptying operation. Converse-ly, it is also desirable to ensure that the emptyin~ operation has been completed when the relevant measuring and indicating unit in the one receptacle reaches the zero setting, and when the indicating device in the other measuring receptacle is at the maximum setting.` This mak`es it impossible for the two measuring receptacles to empty simultaneously~
It i~ desirable for the maximum and zero settings o~
the measuring and indicating units to be in the form of adjust-able contacts, in which case the said contacts may be designed as a contactless switch, and can thus be actuated by the rotat-ing pointer, or the like, of the measuring and indicating unit.
For the purpose of providing, during the emptying of the one receptacle after the other receptacle has been filled, for a build up of pressure therein, it is desirable for the relevant discharge unit to be fitted with an outlet union con-nected to the pressure line from the blower and having a dis-charge line and a bypass line running from the pressure line inside the measuring receptacle and serving to build up the l~L23B12 pressure. In order to allow the flow of air to be adapted to circumstallces, it is desirable for the bypass line to be fittecl with a manually operated adjusting valve. The pressure line preferably opens into the outlet union below an air-permeable diaphragm which is used to fluidize the bulk material within the outlet union.
In order to be able to effect, in a simple manner, the alternating actuation, described above, of the two measuring receptacles, it is desirable to arrange valves in the delivery line, the negative pressure line and the discharge unit of each measuring receptacle, the said valves being controlled by the measuring and indicating units.
It is also desirable for the blower to be preceded, in the suction line by a relief flap through which air can be drawn, when the suction line is closed, to be carried along in the pressure line. This allows a single blower to be used, after the one measuring receptacle has been emptied, to com-plete the emptying of the other measuring receptacle.
It is also desirable for the blower to be preceded, on the pressure side, by an additional valve which allows the blower air on the pressure side to escape to the outside during the filling operation.
The pneumatic valves arranged in the individual lines are preferably electro-magnetic valves, since such valves are easy and simple to control.
A filter may also be arranged in the suction line, to prevent any particles drawn-in from passing into the blower or the pressure line.
The arrangement according to the invention may be operated simply with normal mechanical scales, or may be fitted with expensive weighing means such as strain pressure gauges or the like. In either case, it is particularly advantageous to ~Z38~2 combine the two scales in a common frame set up jointly on the common transportable ba~eplate or, more particularly, in a common "container".
The use of a pressure gauye rnay be advantageou3 because such gauges may be used to provide appropriate switching pulses.
In one application, the individual measuring receptacles may be suspended from a container reinforcing frame, for instance a cross member, in which case the pressure gauge is interposed in a manner known per se, see Figure 3. Moreover, a device may be provided to secure the measuring receptacles at their outlet unions whenever the "container" is moved, for transportation for example. This device may consist, advantageously, of a clamping device provided with two one-armed levers adapted to pivot about an axis, the said levers embracing the lower end of the outlet union in the fixed condition.
In order to permit corresponding vements of the measuring receptacles, the said receptacles are preferably connected to the individual lines by flexible intermediate lines.
It is desirable to provide a recording device which records and prints the number of batches released and the re-spective weights.
Finally, a plurality of silo containers may be pro-vided and connected consecutively to the measuring receptacles.
In this case it is desirable for each silo container to be fit-ted with two branch lines running to the two measuring recepta-cles. The valves controlled by the measuring and indicating units are associated with each of these branch lines, so that when one silo container has been emptied, it is suEficient merely to change over from one valve to the other~ It is also possible to use-more than two measuring receptacl~s.
In accordance with one aspect of the present invenion there is provided a device for the release of measured quanti-38~2 ties of finely granular bulk material, more particularly flour,from at least one transportable silo container, the said device comprising a measuring receptacle having a scale with a pneumatic discharge arrangement and a supply line running between the said silo container and measuring receptacle and adapted to be acted upon by the negative pressure applied to the said measuring re-ceptacle while it is being filled, characterized in that two scales are provided, the measuring receptacles of which are adapted to be connected alternately to the supply line from the silo container, the release of the bulk material from one measuring receptacle taking place while the other measuring receptacle is being filled.
In a further aspect of the present invention, there is provided a device for the release of measured quantities of finely granular bulk material, more particularly flour, from at least one transportable silo container and two measuring xecep-tacles, each comprising a pneumatic discharge arrangement and adapted to be connected alternately to a conveyor line running to the said silo container and to be acted upon by the negative pressure obtaining in the said measurlng receptacles while they are being filled, the bulk material being discharged from one "~ ~?
measuring receptacle while the other is being filled, and ~h~
suction line from each measuring receptacle being adapted to be connected alternately to a blower common to both meas~ring receptacles, whereas the discharge arrangement for each measur-ing receptacle is adapted to be connected alternately to the pressure side of the said blower, characterized in that asso-ciated with each measuring receptacle is a scale and a measur~
ing and indicating device indicating the quantity of material therein and governing the alternate actuation of the said measuring receptacles, each measuring receptacle having an adjustable zero setting and an adjustable maximal setting, the ~,:
31~1Z
emptying o~ each measuring receptacle being initiated when the measuring and indicating device of one measuring recep-tacle is at the maximal setting and that o~ the other is at the zero setting, and the emptying procedure being terminated when the measuring and indicating device of the relevant measuring receptacle reaches the zero setting, while that of the other is at the maximal setting.
The invention is explained hereinafter in greater detail, in conjunction with the examples of embodiment illustrat-ed in the drawing attached hereto, wherein:
Figure 1 is a diagrammatic representation of one de-sign of the device according to the invention:
Figure 2 is a diagrammatic representation of the discharge arrangement of the device according to Figure l;
Figure 3 is a rear view of a truck equi~ped with the device according to the invention, Figure 4 shows a design for the arrangement of a pressure gauge;
Figure 5 is a view along the line V-V in Figure 3 showing a locking device for the lower end of the outlet union of a measuring receptacle: .
Figure 6 is a side elevation of the truck equipped with the device according to the invention.
According to Figure 1, two measuring receptacles 1,2 are provided, connected through supply lines 3a, 3b to silo containers 4a, 4b, and the said lines containing pneumatic valves la, lb and 2a, 2~. Each measuring receptacle is connected, -6a-~Z38~2 through a single negative pressure line, with valves 8a, 8b, to a co~on suction line 17 containing a filter 7. Each mea3uring receptacle also comprises a discharge arxangement 10,11 connected to a common pressure line 24. ~oth suction line 17 and pressure line 24 communicate with a common blower 14, the suction side of which is connected to line 17 and the pressure side to line 24.
Line 17 contains two valves 9a, 9b, valve 9a serving to close suction line 17, while valve 9b serves to open the suction side of blower 14, through a relief flap 5, when valve 9a is closed.
Conversely, a valve 16 is associated with the pressure side of blower 14, to allow the blower air to escape when the discharge arrangement is closed.
Each measuring receptacle is furthermore provided with a measuring and indicating unit 15,22 which indicates when the receptacles are full and simultaneously controls the above-mentioned valves in the arrangement. Units 15,22 have zero settings N and maximum settings M which may ~e in the form of adjustable contacts, contactless switches, or the like.
The measuring receptacles are connected to the supply and pressure lines through flexible intermediate lines 19.
Figure 2 is a diagrammatic representation of a design for a discharge arrangement. In this case, valves lOa, lOb are arranged on each side of outlet union 25 on each measuring receptacle, and serve to open and close the discharge arrange-ments.
Each outlet union 25 is also equipped with a bypass line 21 containing an adjusting valve 12, allowing some of the air to flow into the measuring receptacle in order to build up the pressure required to discharge the bulk material through line 18. 1'he actual supply of air from pressure line 24 is to the underside of a diaphragm 20 which is air-permeable and is used to fluidize the bulk material inside outlet union 25~
Bypass line 21, with its manually operated adjusting valve 12 makes it posslble to adapt the flow of air to the type of bulk material.
The arrangement described above operates as ~ollows:
since measuring receptacles 1,2 are initially empty, switching arrangements select one of them to be filled first.
Let it be assumed that receptacle 1 in Figure l has been selected.
At 'he start of the operation for filling measuring receptacle 1, one of valves la, lb is open, as are valves 8b and 9a. As a result of this, when blower 14 is switched on, bulk material passes through negative pressure line 23, into measuring receptacle 1, through open valve la or lb. The fill-ing operation now proceeds until the maximum contact in measur-ing and indicating unit 15, which may be in the form of a con-tactless switch, is actuated, causing valves la or 1~ and 8b to close. During the filling operation, valve 16 is also open, to allow the air from the pressure side of the blower to escape to the outside. ~Yhen the maximum contact in unit 15 is reached, valve 16 is also closed, together with valvas la and 8b.
The closing of`the maximum contact in measuring and indicating unit 15 also causes one of valves 2a or 2b, and re-levant valve 8a in suction line 23, to open, so that second measuring receptacle 2 may be actuated.
Second measuring receptacle 2 may now be filled.
Simultaneously with the opening of valves 2a or 2b and 8a, valves lOa, lOb in discharge arrangement 10 (see Figure 2) of ~irst measuring receptacle 1 are opened, and the discharge o~
the bulk material begins in a manner known per se.
However, the filling of second measuring receptacle 2, and the discharge from first measuring receptacle 1, proceed only if the maximum contact in measuring and indicating unit 15, in first measuring receptacle 1 is closed, w~ile the zero ~LZ3~12 contact in measuring and indicating unit 22 i~ still in its ~ero setting N.
The operation of filliny second measuring receptacle
One known arrangement of this kind comprises a single measuring recep-tacle which is built up, with the silo container and the delivery means associated therewith, on a transportable baseplate. This known arrangement is used for, among other things, supplying separate quantities of flour in bakeries.
The disadvantage of this known arrangement is that delivery of the flour is delayed because the delivery means must be halted during the weighing and measuring operations.
Because of these pauses, the output from the kno~n arrangement is relatively low and delivery times are thus lengthened. This increases not only labour costs but vehicle-utilization costs.
It i9 therefore the purpose of the invention to de-sign an arrangement of the type mentioned at the beginning hereof in such a manner as to increase the output thereof con~
siderably.
According to the invention, this purpose is achieved in that two scales are provided, the measuring receptacles of which are adapted to be connected alternately to the supply line running to the silo container, release of the bulk material from the one measuring receptacle taking place while the other measuring receptacle is being filled.
With this arrangement, the output as compared with 38~L2 that of the known arrangement can be doubled at only a slight additional expense, thus having delivery times.
The alternate but simultaneous filliny and ernptying of the two measuring receptacles makes it possible to keep the said receptacles quite small, in spite of the increased output.
As compared with the known arrangement, which uses a relative-ly large m~asuring receptacle, the overall arrangement accord-ing to the invention is relatively small and compact, in spite of the fact that two measuring receptacles are used.
As compared with the known arrangement, the arrange-ment according to the invention also has the advantage that while one measuring receptacle is being emptied, pressure can be built up, after the other measuring receptacle has been filled, for the subsequent emptying thereof. Thus, in addition to shortening the delivery time ta on~e half of that required by the known arrangement, the arrangement according to the inven-tion saves additional time since, with the known arrangement, pressure must first be built up in the measuring receptacle each time before it is emptied.
Although it is, of course, possible to use two blowers, one supplying the negative pressure for filling the measuring receptacles, and one supplying the positive pressure for empty-ing them, it is a great advantage if the negative-pressure line to each measuring receptacle can be connected alternately to the suction side, and the discharge from each measuring receptacle can be connected alternately to the pressure side, of a blower common to both measuring receptacles~ This makes it possible to use one and the same blower ror both filling and emptying, thus providirlg savings in equipment, space and energy, the latter in particular because one side of the blower is not operating in free air.
It is desirable to provide, for control of the alter--~1~3i3~ ;~
nating actuation of the two measuring receptacles, a-t least on~
measuring and indicating unit for e~ch receptacle, which indi-cates when each receptacle is full and triggers the alternate actuation of the said measuring receptacles, since -this makes very accurate control possibLe. A particularly simple and advantageous design is obtained by providing each measuring and indicating unit with a zero and a maximum setting, the emptying of the relevant measuring receptacle being initiated as soon as the measuring and indicating unit thereof is at the maximum setting and that of the other receptacle is at the zero ~etting.
This ensures that the emptying of the filled receptacle starts only when the other measuring receptacle has been completely emptied, which is important because the filling operation generally takes less time than the emptying operation. Converse-ly, it is also desirable to ensure that the emptyin~ operation has been completed when the relevant measuring and indicating unit in the one receptacle reaches the zero setting, and when the indicating device in the other measuring receptacle is at the maximum setting.` This mak`es it impossible for the two measuring receptacles to empty simultaneously~
It i~ desirable for the maximum and zero settings o~
the measuring and indicating units to be in the form of adjust-able contacts, in which case the said contacts may be designed as a contactless switch, and can thus be actuated by the rotat-ing pointer, or the like, of the measuring and indicating unit.
For the purpose of providing, during the emptying of the one receptacle after the other receptacle has been filled, for a build up of pressure therein, it is desirable for the relevant discharge unit to be fitted with an outlet union con-nected to the pressure line from the blower and having a dis-charge line and a bypass line running from the pressure line inside the measuring receptacle and serving to build up the l~L23B12 pressure. In order to allow the flow of air to be adapted to circumstallces, it is desirable for the bypass line to be fittecl with a manually operated adjusting valve. The pressure line preferably opens into the outlet union below an air-permeable diaphragm which is used to fluidize the bulk material within the outlet union.
In order to be able to effect, in a simple manner, the alternating actuation, described above, of the two measuring receptacles, it is desirable to arrange valves in the delivery line, the negative pressure line and the discharge unit of each measuring receptacle, the said valves being controlled by the measuring and indicating units.
It is also desirable for the blower to be preceded, in the suction line by a relief flap through which air can be drawn, when the suction line is closed, to be carried along in the pressure line. This allows a single blower to be used, after the one measuring receptacle has been emptied, to com-plete the emptying of the other measuring receptacle.
It is also desirable for the blower to be preceded, on the pressure side, by an additional valve which allows the blower air on the pressure side to escape to the outside during the filling operation.
The pneumatic valves arranged in the individual lines are preferably electro-magnetic valves, since such valves are easy and simple to control.
A filter may also be arranged in the suction line, to prevent any particles drawn-in from passing into the blower or the pressure line.
The arrangement according to the invention may be operated simply with normal mechanical scales, or may be fitted with expensive weighing means such as strain pressure gauges or the like. In either case, it is particularly advantageous to ~Z38~2 combine the two scales in a common frame set up jointly on the common transportable ba~eplate or, more particularly, in a common "container".
The use of a pressure gauye rnay be advantageou3 because such gauges may be used to provide appropriate switching pulses.
In one application, the individual measuring receptacles may be suspended from a container reinforcing frame, for instance a cross member, in which case the pressure gauge is interposed in a manner known per se, see Figure 3. Moreover, a device may be provided to secure the measuring receptacles at their outlet unions whenever the "container" is moved, for transportation for example. This device may consist, advantageously, of a clamping device provided with two one-armed levers adapted to pivot about an axis, the said levers embracing the lower end of the outlet union in the fixed condition.
In order to permit corresponding vements of the measuring receptacles, the said receptacles are preferably connected to the individual lines by flexible intermediate lines.
It is desirable to provide a recording device which records and prints the number of batches released and the re-spective weights.
Finally, a plurality of silo containers may be pro-vided and connected consecutively to the measuring receptacles.
In this case it is desirable for each silo container to be fit-ted with two branch lines running to the two measuring recepta-cles. The valves controlled by the measuring and indicating units are associated with each of these branch lines, so that when one silo container has been emptied, it is suEficient merely to change over from one valve to the other~ It is also possible to use-more than two measuring receptacl~s.
In accordance with one aspect of the present invenion there is provided a device for the release of measured quanti-38~2 ties of finely granular bulk material, more particularly flour,from at least one transportable silo container, the said device comprising a measuring receptacle having a scale with a pneumatic discharge arrangement and a supply line running between the said silo container and measuring receptacle and adapted to be acted upon by the negative pressure applied to the said measuring re-ceptacle while it is being filled, characterized in that two scales are provided, the measuring receptacles of which are adapted to be connected alternately to the supply line from the silo container, the release of the bulk material from one measuring receptacle taking place while the other measuring receptacle is being filled.
In a further aspect of the present invention, there is provided a device for the release of measured quantities of finely granular bulk material, more particularly flour, from at least one transportable silo container and two measuring xecep-tacles, each comprising a pneumatic discharge arrangement and adapted to be connected alternately to a conveyor line running to the said silo container and to be acted upon by the negative pressure obtaining in the said measurlng receptacles while they are being filled, the bulk material being discharged from one "~ ~?
measuring receptacle while the other is being filled, and ~h~
suction line from each measuring receptacle being adapted to be connected alternately to a blower common to both meas~ring receptacles, whereas the discharge arrangement for each measur-ing receptacle is adapted to be connected alternately to the pressure side of the said blower, characterized in that asso-ciated with each measuring receptacle is a scale and a measur~
ing and indicating device indicating the quantity of material therein and governing the alternate actuation of the said measuring receptacles, each measuring receptacle having an adjustable zero setting and an adjustable maximal setting, the ~,:
31~1Z
emptying o~ each measuring receptacle being initiated when the measuring and indicating device of one measuring recep-tacle is at the maximal setting and that o~ the other is at the zero setting, and the emptying procedure being terminated when the measuring and indicating device of the relevant measuring receptacle reaches the zero setting, while that of the other is at the maximal setting.
The invention is explained hereinafter in greater detail, in conjunction with the examples of embodiment illustrat-ed in the drawing attached hereto, wherein:
Figure 1 is a diagrammatic representation of one de-sign of the device according to the invention:
Figure 2 is a diagrammatic representation of the discharge arrangement of the device according to Figure l;
Figure 3 is a rear view of a truck equi~ped with the device according to the invention, Figure 4 shows a design for the arrangement of a pressure gauge;
Figure 5 is a view along the line V-V in Figure 3 showing a locking device for the lower end of the outlet union of a measuring receptacle: .
Figure 6 is a side elevation of the truck equipped with the device according to the invention.
According to Figure 1, two measuring receptacles 1,2 are provided, connected through supply lines 3a, 3b to silo containers 4a, 4b, and the said lines containing pneumatic valves la, lb and 2a, 2~. Each measuring receptacle is connected, -6a-~Z38~2 through a single negative pressure line, with valves 8a, 8b, to a co~on suction line 17 containing a filter 7. Each mea3uring receptacle also comprises a discharge arxangement 10,11 connected to a common pressure line 24. ~oth suction line 17 and pressure line 24 communicate with a common blower 14, the suction side of which is connected to line 17 and the pressure side to line 24.
Line 17 contains two valves 9a, 9b, valve 9a serving to close suction line 17, while valve 9b serves to open the suction side of blower 14, through a relief flap 5, when valve 9a is closed.
Conversely, a valve 16 is associated with the pressure side of blower 14, to allow the blower air to escape when the discharge arrangement is closed.
Each measuring receptacle is furthermore provided with a measuring and indicating unit 15,22 which indicates when the receptacles are full and simultaneously controls the above-mentioned valves in the arrangement. Units 15,22 have zero settings N and maximum settings M which may ~e in the form of adjustable contacts, contactless switches, or the like.
The measuring receptacles are connected to the supply and pressure lines through flexible intermediate lines 19.
Figure 2 is a diagrammatic representation of a design for a discharge arrangement. In this case, valves lOa, lOb are arranged on each side of outlet union 25 on each measuring receptacle, and serve to open and close the discharge arrange-ments.
Each outlet union 25 is also equipped with a bypass line 21 containing an adjusting valve 12, allowing some of the air to flow into the measuring receptacle in order to build up the pressure required to discharge the bulk material through line 18. 1'he actual supply of air from pressure line 24 is to the underside of a diaphragm 20 which is air-permeable and is used to fluidize the bulk material inside outlet union 25~
Bypass line 21, with its manually operated adjusting valve 12 makes it posslble to adapt the flow of air to the type of bulk material.
The arrangement described above operates as ~ollows:
since measuring receptacles 1,2 are initially empty, switching arrangements select one of them to be filled first.
Let it be assumed that receptacle 1 in Figure l has been selected.
At 'he start of the operation for filling measuring receptacle 1, one of valves la, lb is open, as are valves 8b and 9a. As a result of this, when blower 14 is switched on, bulk material passes through negative pressure line 23, into measuring receptacle 1, through open valve la or lb. The fill-ing operation now proceeds until the maximum contact in measur-ing and indicating unit 15, which may be in the form of a con-tactless switch, is actuated, causing valves la or 1~ and 8b to close. During the filling operation, valve 16 is also open, to allow the air from the pressure side of the blower to escape to the outside. ~Yhen the maximum contact in unit 15 is reached, valve 16 is also closed, together with valvas la and 8b.
The closing of`the maximum contact in measuring and indicating unit 15 also causes one of valves 2a or 2b, and re-levant valve 8a in suction line 23, to open, so that second measuring receptacle 2 may be actuated.
Second measuring receptacle 2 may now be filled.
Simultaneously with the opening of valves 2a or 2b and 8a, valves lOa, lOb in discharge arrangement 10 (see Figure 2) of ~irst measuring receptacle 1 are opened, and the discharge o~
the bulk material begins in a manner known per se.
However, the filling of second measuring receptacle 2, and the discharge from first measuring receptacle 1, proceed only if the maximum contact in measuring and indicating unit 15, in first measuring receptacle 1 is closed, w~ile the zero ~LZ3~12 contact in measuring and indicating unit 22 i~ still in its ~ero setting N.
The operation of filliny second measuring receptacle
2 now proceed~ in the manner described hereinbefore, untll measuring and indicating unit 22 thèreof reaches adjustable maximum contact M. This contact is adjusted in relation to the filling weight desired. As soon a~ the maximum contact is reached, filling is halted, as described above, by the closing of valves 2a and 8a. In addition to this, valve 9a is closed and valve 9b is opened. When the maximum value is reached and the scale has come to rest, the value indicated is recorded, ~or example by means of an electronic storage device.
Now since filling generally takes less time than empty-ing, care must be taken to ensure that the discharge from measuring receptacle 1 still continues after measuring recepta-cle 2 ha~ been filled. This is achieved in that the discharge from measuring receptacle 1 is terminated only when measuring and indicating unit 15 has reached zero setting N. Until thi~
happens, valves lOa and lOb or discharge arrangement 10 o~
measuring receptacle 1 remain open. At this time, aix continues to be drawn in through relief-flap 5 and valve 9b, and is thus passed to pressure line 24.
When zero contact N in unit 15 is reached, discharga arrangement 10 of measuring receptacle 1 is closed, valves la and 8a are opened again, and discharge arrangement 11 of second receptacle 2 is opened, thus allowing the cycle described above to begin again. In this case measuring receptacle 1 is filled and measuring receptacle 2 is emptied.
As soon as one of the silo containers, for example container 4a, has been imptied, a change-over i~ made ~rom supply line 3a to supply line 3b, valves lb and 2b being actuated, instead of valves la and 2a, during tha filling opera-
Now since filling generally takes less time than empty-ing, care must be taken to ensure that the discharge from measuring receptacle 1 still continues after measuring recepta-cle 2 ha~ been filled. This is achieved in that the discharge from measuring receptacle 1 is terminated only when measuring and indicating unit 15 has reached zero setting N. Until thi~
happens, valves lOa and lOb or discharge arrangement 10 o~
measuring receptacle 1 remain open. At this time, aix continues to be drawn in through relief-flap 5 and valve 9b, and is thus passed to pressure line 24.
When zero contact N in unit 15 is reached, discharga arrangement 10 of measuring receptacle 1 is closed, valves la and 8a are opened again, and discharge arrangement 11 of second receptacle 2 is opened, thus allowing the cycle described above to begin again. In this case measuring receptacle 1 is filled and measuring receptacle 2 is emptied.
As soon as one of the silo containers, for example container 4a, has been imptied, a change-over i~ made ~rom supply line 3a to supply line 3b, valves lb and 2b being actuated, instead of valves la and 2a, during tha filling opera-
3~2 tion.
Figure 3 is a rear view of a truck 26 equipped withthe device according to the invention. In this case measuring receptacles 1, 2, including respectively indicating units 15 and 22, are suspended and accordingly supported on a common frame 27 which stiffens or reinforces the "container" i.e.
housing, and indeed on a cross member 28 overlapping recep-tacles 1,2. Thus, the common frame is disposed upon a mobile base-plate surrounded by a housing enclosing the device.
Filter 7 (see Figure 1) is arranged between measuring recep-tacles 1, 2.
Located between upper holder 29 of each measuring receptacle, and cross member 28, in a manner known per se, are strain pressure-gauges 30. The weight of the filled receptacles thus acts upon gauges 30 and can be indicated accordingly. In the design according to Figure 3, half-frames 31,32 are provided for this purpose. These half-frames are each secured to one end of the pressure-gauge which therefore lies between them.
A modification of this design is shown in Figure 4.
In this case, in contrast to Figure 3, each pressure-gauge is enclosed in two complete frames 33,34 preferably arranged at right angles to each other.
As may also be gathered from Figure 3, outlet unions 25 from measuring receptacles 1,2 may be secured during trans-portation by means of a clamping device 35.
Figure 5 is a plan vlew, along the line V-V in Figure 3, of this clamping device. As may be gathered from Figure 5, the said clamping device may consist of two levers, adapted to pivot about an axis 37, which engage around the lower end of the outlet union when they are locked.
Figure 6 is a side elevation of truck 26 shown in Figure 3 and shows the arrangement of the two silo containers ..
- ~iL23~L2 4a, 4b in relation to rneasuring receptacles 1,2 located at the rear end of the vehicle~ The said silo containers may be made of a flexible material adapted to be compressed in the yertical direction.
It may also be gathered from Figure 6 that silo con-tainers 4a, 4b, together with the weighing means in the form of measuring receptacles 1,2, are arranged upon a common trans-portable baseplate 38 which is thus a part of the complete "container" 39 and carries it.
' i~ P
.
Figure 3 is a rear view of a truck 26 equipped withthe device according to the invention. In this case measuring receptacles 1, 2, including respectively indicating units 15 and 22, are suspended and accordingly supported on a common frame 27 which stiffens or reinforces the "container" i.e.
housing, and indeed on a cross member 28 overlapping recep-tacles 1,2. Thus, the common frame is disposed upon a mobile base-plate surrounded by a housing enclosing the device.
Filter 7 (see Figure 1) is arranged between measuring recep-tacles 1, 2.
Located between upper holder 29 of each measuring receptacle, and cross member 28, in a manner known per se, are strain pressure-gauges 30. The weight of the filled receptacles thus acts upon gauges 30 and can be indicated accordingly. In the design according to Figure 3, half-frames 31,32 are provided for this purpose. These half-frames are each secured to one end of the pressure-gauge which therefore lies between them.
A modification of this design is shown in Figure 4.
In this case, in contrast to Figure 3, each pressure-gauge is enclosed in two complete frames 33,34 preferably arranged at right angles to each other.
As may also be gathered from Figure 3, outlet unions 25 from measuring receptacles 1,2 may be secured during trans-portation by means of a clamping device 35.
Figure 5 is a plan vlew, along the line V-V in Figure 3, of this clamping device. As may be gathered from Figure 5, the said clamping device may consist of two levers, adapted to pivot about an axis 37, which engage around the lower end of the outlet union when they are locked.
Figure 6 is a side elevation of truck 26 shown in Figure 3 and shows the arrangement of the two silo containers ..
- ~iL23~L2 4a, 4b in relation to rneasuring receptacles 1,2 located at the rear end of the vehicle~ The said silo containers may be made of a flexible material adapted to be compressed in the yertical direction.
It may also be gathered from Figure 6 that silo con-tainers 4a, 4b, together with the weighing means in the form of measuring receptacles 1,2, are arranged upon a common trans-portable baseplate 38 which is thus a part of the complete "container" 39 and carries it.
' i~ P
.
Claims (12)
1. A device for the release of measured quantities of finely granular bulk material, more particularly flour, from at least one transportable silo container and two measuring receptacles, each comprising a pneumatic discharge arrange-ment and adapted to be connected alternately to a conveyor line running to the said silo container and to be acted upon by the negative pressure obtaining in the said measuring re-ceptacles while they are being filled, the bulk material be-ing discharged from one measuring receptacle while the other is being filled, and a suction line from each measuring re-ceptacle being adapted to be connected alternately to a blower common to both measuring receptacles, whereas the discharge arrangement for each measuring receptacle is adapted to be connected alternately to the pressure side of the said blower, characterized in that associated with each measuring recep-tacle is a scale and a measuring and indicating device indi-cating the quantity of material therein and governing the alternate actuation of the said measuring receptacles, each measuring receptacle having an adjustable zero setting and an adjustable maximal setting, the emptying of each measuring receptacle being initiated when the measuring and indicating device of one measuring receptacle is at the maximal setting and that of the other is at the zero setting, and the empty-ing procedure being terminated when the measuring and indicat-ing device of the relevant measuring receptacle reaches the zero setting, while that of the other is at the maximal setting.
2. A device according to claim 1, characterized in that while the one measuring receptacle is being emptied, the other, after being filled, is pressurized.
3. A device according to claim 1, characterized in that the maximal and zero settings of the measuring and indi-cating devices are in the form of adjustable contacts, in-cluding non contact switches.
4. A device according to claims 1, 2 or 3, character-ized in that arranged in the conveyor line, in the suction line, and in the discharge arrangement of each measuring re-ceptacle are valves adapted to be controlled by the said measuring and indicating devices.
5. A device according to claim 1, characterized in that each discharge arrangement comprises a discharge con-nection connected to the pressure line running from the blower and having a discharge line and a bypass line, with an ad-justing valve, running from the said pressure line into the interior of the measuring receptacle and serving to build up pressure.
6. A device according to claim 5, characterized in that the pressure line opens out into the discharge connec-tion below an air permeable diaphragm.
7. A device according to claims 1, 2 or 3, charac-terized in that in the suction line, at least one valve, having a relief flap, precedes the blower, air destined for the pressure line being adapted to be drawn through the said flap when the suction line is closed.
8. A device according to claims 1, 2 or 3, charac-terized in that a valve is located on the pressure side of the blower, the air on the pressure side of the blower flowing through this valve to the outside during the filling procedure.
9. A device according to claims 1, 2 or 3, characterized in that both scales are supported on a common frame which is disposed upon a mobile baseplate surrounded by a housing en-closing said device.
10. A device according to claims 1, 2 or 3, characterized in that the scales make use of pressure measuring cells known per se and acting upon the measuring and indicating devices, the individual measuring receptable being suspended from a frame stiffening a housing enclosing said device, namely a cross-member extending across the measuring receptacles, with the said pressure measuring cells therebetween.
11. A device according to claims 5 or 6, characterized in that a locking device is provided which secures the measuring receptacle at the discharge connections, said discharge con-nections including lower ends, the said device consisting of a clamping means comprising two single ended levers adapted to pivot about an axis, the said levers, when in the locked position, enclosing the lower ends of the said discharge con-nections.
12. A device according to claims 1, 2 or 3, characterized in that a plurality of silo containers is provided, the said containers being adapted to be connected consecutively to the measuring receptacles, and each container being equipped with two branch lines running to the two measuring receptacles and fitted with valves controlled by the said measuring and in-dicating devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA329,760A CA1123812A (en) | 1979-06-14 | 1979-06-14 | Device for the release of measured quantities of finely-granular bulk material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA329,760A CA1123812A (en) | 1979-06-14 | 1979-06-14 | Device for the release of measured quantities of finely-granular bulk material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1123812A true CA1123812A (en) | 1982-05-18 |
Family
ID=4114455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA329,760A Expired CA1123812A (en) | 1979-06-14 | 1979-06-14 | Device for the release of measured quantities of finely-granular bulk material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1123812A (en) |
-
1979
- 1979-06-14 CA CA329,760A patent/CA1123812A/en not_active Expired
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| Date | Code | Title | Description |
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| MKEX | Expiry |