CN113311780A - Automatic control system for discharging clinker - Google Patents
Automatic control system for discharging clinker Download PDFInfo
- Publication number
- CN113311780A CN113311780A CN202110616278.1A CN202110616278A CN113311780A CN 113311780 A CN113311780 A CN 113311780A CN 202110616278 A CN202110616278 A CN 202110616278A CN 113311780 A CN113311780 A CN 113311780A
- Authority
- CN
- China
- Prior art keywords
- control
- transmitter
- control system
- clinker
- master station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007599 discharging Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000004568 cement Substances 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 238000010009 beating Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1103—Special, intelligent I-O processor, also plc can only access via processor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses a clinker ex-warehouse automatic control system which comprises a material warehouse discharging system, a transmission system, an electric control system and a control system, wherein the material warehouse discharging system consists of a material warehouse, a discharging port and an electric flow valve, and the discharging port is provided with the electric flow valve; the transmission system comprises a first transmitter, a second transmitter and a third transmitter, the first transmitter is provided with a DP master station, the second transmitter and the third transmitter are both provided with DP slave stations, the control system comprises a control room and a PLC controller, and the PLC controller is respectively connected with the electric flow valve, the first transmitter, the second transmitter, the third transmitter, the DP master station and the DP slave stations. According to the invention, the electric flow valve is arranged, so that the equipment failure rate is reduced, automatic programming is carried out through the PLC, manual operation by workers is not required, the consumption of human resources is saved, and potential safety hazards in actual operation are avoided.
Description
Technical Field
The invention relates to the technical field of cement production and processing, in particular to an automatic control system for discharging clinker out of a warehouse.
Background
In the cement production process, the cement clinker uses limestone, clay and iron raw materials as main raw materials, and is prepared into raw materials according to a proper proportion, and the raw materials are burnt until part or all of the raw materials are molten, and cooled to obtain a semi-finished product. In the cement industry, the most commonly used portland cement clinker has the major chemical components calcium oxide, silica and minor amounts of alumina and iron oxide. The main minerals are tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. The Portland cement clinker is ground together with a proper amount of gypsum to obtain the Portland cement.
In the cement clinker transportation process, as the ex-warehouse and the transmission process of the clinker are more, and the number of nodes needing manual control is also more, certain human resources are required to be invested for manual control, and the actual operation flexibility is poor.
Through the massive search, the prior art is found, the publication number is CN210752968U, a clinker blanking device for cement production and processing is disclosed, the technical field of cement production is related, and the main purpose is to avoid the dust emission phenomenon of cement clinker. The utility model discloses a main technical scheme does: a clinker unloader for cement manufacturing process, the apparatus comprising: the discharging part is used for outputting the crushed cement clinker; the conveying mechanism is arranged in the shell and comprises a belt and a driving roller, the belt is tensioned on the driving roller, and the blanking part is connected to the shell above the belt; the one end of exhaust tube is connected in the casing up end, and the other end is connected in air exhaust equipment, filters the fixed one end that sets up in the exhaust tube, shakes the mechanism and including shaking and beat pole, cam, top fishplate bar and the pole that pushes away, cam coaxial coupling in drive roller, top fishplate bar top connect in the top edge of cam, the one end of passing the push rod is rotated and is connected in top fishplate bar, the other end rotates and connects in the one end of shaking and beating the pole, the other end of shaking and beating the pole contacts in filtering the piece, the middle part of shaking and beating the pole rotates and connects in the casing.
In conclusion, in the actual use process of the existing cement clinker ex-warehouse equipment, the blanking and transmission nodes of the clinker ex-warehouse are manually controlled, certain human resources are required to be input for manual control, the actual operation flexibility is poor, the working environment of a post worker is large in dust, high in environmental temperature, severe in environment and low in safety coefficient of actual operation, the effect of automatically controlling the cement clinker to be automatically ex-warehouse cannot be achieved, and therefore the cost of enterprise operation is increased, and the labor intensity of workers is increased.
Disclosure of Invention
The invention aims to provide an automatic clinker ex-warehouse control system to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a clinker ex-warehouse automatic control system comprises a material warehouse discharging system, a transmission system, an electric control system and a control system, wherein the material warehouse discharging system comprises a material warehouse, discharge ports and electric flow valves, the discharge ports are all arranged on the lower surface of the material warehouse, and the electric flow valves are all arranged on the discharge ports;
the transmission system comprises a first transmitter, a second transmitter and a third transmitter, a DP master station is arranged on one side of the first transmitter, DP slave stations are arranged on one sides of the second transmitter and the third transmitter, the power control system comprises a control cabinet and a power distribution room, and the DP slave stations are arranged in the power distribution room;
the control system comprises a control room and a PLC (programmable logic controller), wherein the PLC is respectively connected with the electric flow valve, the first transmitter, the second transmitter, the third transmitter, the DP master station and the DP slave station.
Preferably, the DP master station and the DP slave station are both configured by an analog quantity module, a switching quantity module and an ET200M module;
the DP slave station is connected with the DP master station, the DP slave station transmits signals to a GPU of the DP master station, and the DP master station feeds the signals back to the DP slave station respectively.
Preferably, the first conveyor, the second conveyor and the third conveyor in the conveying system respectively correspond to the three discharge ports of the material warehouse, and the channel inlets of the first conveyor, the second conveyor and the third conveyor are respectively positioned below the three discharge ports.
Preferably, a control cabinet in the power control system is arranged in a kiln head power room, an output end of the control cabinet is connected with the DP slave station, and the PLC outputs signals to the DP slave station so as to control the output of electric signals of the control cabinet.
Preferably, the control system is based on a computer terminal, the PLC controller is in network connection with the computer terminal, and the computer terminal performs programming control on the PLC controller and is used for the PLC controller to output signals to the DP master station;
the control room is loaded with a central control image operation system, signal input ends of the central control image operation system are respectively connected with an outlet end of the material warehouse, an input end and an output end of the transmission system, and are used for monitoring an operation process by an operator in real time, and the signal input ends of the central control image operation system are connected with cameras and are used for image real-time acquisition and transmission feedback.
Preferably, the operation flow of the central control screen operating system is as follows:
the camera at the signal input end of the central control picture operating system respectively collects the inlet pictures of the discharge port and the transmission system and uploads the inlet pictures to the central control picture operating system;
and the central control picture operating system transmits the digital signals to a computer terminal for an operator to check the running process in real time.
Preferably, the operation flow of the clinker ex-warehouse control system is as follows:
s1: an operator programs a PLC controller through a computer terminal, the PLC controller runs a programming program and sends signals to a DP master station and an electric flow valve;
s2: after the PLC controller transmits the signals to the DP master station, the DP master station transmits the signals to the DP slave stations respectively;
s3: the electric flow valves respectively control the clinker discharge amount in the discharge hole of the silo, and the DP master station and the DP slave station respectively control the running speeds of the first conveyor, the second conveyor and the third conveyor to realize the control of automatic clinker discharge from the silo;
s4: and the central control picture operating system transmits the digital signals to a computer terminal for an operator to check the running process in real time.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the electric flow valve is arranged on the discharge port, the electric flow valve can be controlled through the PLC, manual control by workers is not required, the on-off of the discharge port can be realized by operators through a computer terminal and a preset program of the PLC, the flexibility of clinker discharging control of the discharge port is stronger, and compared with the traditional electric gate valve, the electric flow valve has lower failure rate, and the maintenance cost can be saved;
the DP master station and the DP slave station are arranged in the transmission system, so that the PLC controller can be conveniently controlled, the clinker conveying speeds of the first conveyor, the second conveyor and the third conveyor are controlled, workers do not need to manually control the first conveyor, the second conveyor and the third conveyor respectively, the actual operation is simple, convenient and quick, the safety coefficient of practical operation is higher, and the effect of automatically controlling cement clinker to be automatically delivered out of a warehouse is realized.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides four embodiments:
the first embodiment is as follows:
a clinker ex-warehouse automatic control system comprises a material warehouse discharging system, a transmission system, an electric control system and a control system, wherein the material warehouse discharging system is composed of a material warehouse, discharge ports and electric flow valves, the discharge ports are all arranged on the lower surface of the material warehouse, and the electric flow valves are all arranged on the discharge ports; the first conveyor, the second conveyor and the third conveyor in the conveying system respectively correspond to the three discharge ports of the material warehouse, and the channel inlets of the first conveyor, the second conveyor and the third conveyor are respectively positioned below the three discharge ports.
The transmission system comprises a first transmitter, a second transmitter and a third transmitter, a DP master station is arranged on one side of the first transmitter, DP slave stations are arranged on one sides of the second transmitter and the third transmitter, the power control system comprises a control cabinet and a power distribution room, the DP slave stations are arranged in the power distribution room, a control cabinet in the power control system is arranged in a kiln head power room, the output end of the control cabinet is connected with the DP slave stations, and the PLC outputs signals to the DP slave stations so as to control the output of electric signals of the control cabinet;
the control system consists of a control room and a PLC (programmable logic controller), wherein the PLC is respectively connected with the electric flow valve, the first transmitter, the second transmitter, the third transmitter, the DP master station and the DP slave station; the PLC controller adopts an S7200 model.
The DP master station and the DP slave station are respectively composed of an analog quantity module, a switching value module and an ET200M module configuration; as is well known to those skilled in the art, the provision of the PLC controller and the ET200M module are well known and are conventional in the art, and will not be described further herein, and any selection and matching may be made by those skilled in the art according to their needs or convenience
The DP slave station is connected with the DP master station, transmits signals to a GPU of the DP master station, and feeds the signals back to the DP slave station respectively.
DP main website and DP slave station can be convenient for the PLC controller to control to the grog conveying speed to first conveyer, second conveyer and third conveyer controls, need not the staff and carries out manual control respectively to first conveyer, second conveyer and third conveyer, and actual operation is simple and convenient more swift, and the factor of safety of real operation is higher, has realized the automatic effect of leaving warehouse of automated control cement grog.
Example two:
the control system is based on a computer terminal, a PLC (programmable logic controller) is in network connection with the computer terminal, and the computer terminal performs programming control on the PLC and is used for outputting a signal to a DP (data processing) master station by the PLC;
the control room is provided with a central control picture operating system, signal input ends of the central control picture operating system are all connected with a material warehouse outlet end, a transmission system input end and an output end, and are used for monitoring an operation process in real time by an operator, and the signal input ends of the central control picture operating system are all connected with a camera and are used for picture real-time acquisition and transmission feedback.
Example three:
the operation flow of the central control picture operation system is as follows:
a camera at the signal input end of the central control picture operating system respectively collects the inlet pictures of the discharge port and the transmission system and uploads the inlet pictures to the central control picture operating system;
and the central control picture operating system transmits the digital signals to the computer terminal for an operator to check the operation flow in real time.
Example four:
the operation flow of the clinker ex-warehouse control system is as follows:
s1: an operator programs a PLC controller through a computer terminal, the PLC controller runs a programming program and sends signals to a DP master station and an electric flow valve;
s2: after the PLC controller transmits the signals to the DP master station, the DP master station transmits the signals to the DP slave stations respectively;
s3: the electric flow valve respectively controls the clinker discharge amount in the discharge hole of the silo, and the DP master station and the DP slave station respectively control the running speeds of the first conveyor, the second conveyor and the third conveyor to realize the control of automatic clinker discharge;
s4: and the central control picture operating system transmits the digital signals to the computer terminal for an operator to check the operation flow in real time.
The working principle is as follows: an operator programs a PLC controller through a computer terminal, the PLC controller runs a programming program and transmits signals to a DP master station and an electric flow valve, and after the PLC controller transmits the signals to the DP master station, the DP master station transmits the signals to DP slave stations respectively; the electric flow valve respectively controls the clinker discharge amount in the discharge hole of the silo, and the DP master station and the DP slave station respectively control the running speeds of the first conveyor, the second conveyor and the third conveyor to realize the control of automatic clinker discharge; and the central control picture operating system transmits the digital signals to the computer terminal for an operator to check the operation flow in real time.
The electric flow valve can be controlled by the PLC without manual control of workers, the on-off of the discharge port can be realized by the operators through a computer terminal and a preset program of the PLC, the flexibility of clinker discharging control of the discharge port is stronger, and compared with the traditional electric gate valve, the electric flow valve has lower failure rate and can save maintenance and repair cost;
DP main website and DP slave station can be convenient for the PLC controller to control to the grog conveying speed to first conveyer, second conveyer and third conveyer controls, need not the staff and carries out manual control respectively to first conveyer, second conveyer and third conveyer, and actual operation is simple and convenient more swift, and the factor of safety of real operation is higher, has realized the automatic effect of leaving warehouse of automated control cement grog.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. A grog ex-warehouse automatic control system which characterized in that: the clinker discharging control system comprises a material warehouse discharging system, a transmission system, an electric control system and a control system, wherein the material warehouse discharging system comprises a material warehouse, discharge ports and electric flow valves, the discharge ports are all arranged on the lower surface of the material warehouse, and the electric flow valves are all arranged on the discharge ports;
the transmission system comprises a first transmitter, a second transmitter and a third transmitter, a DP master station is arranged on one side of the first transmitter, DP slave stations are arranged on one sides of the second transmitter and the third transmitter, the power control system comprises a control cabinet and a power distribution room, and the DP slave stations are arranged in the power distribution room;
the control system comprises a control room and a PLC (programmable logic controller), wherein the PLC is respectively connected with the electric flow valve, the first transmitter, the second transmitter, the third transmitter, the DP master station and the DP slave station.
2. The clinker ex-warehouse automatic control system according to claim 1, characterized in that: the DP master station and the DP slave station are respectively composed of an analog quantity module, a switching value module and an ET200M module configuration;
the DP slave station is connected with the DP master station, the DP slave station transmits signals to a GPU of the DP master station, and the DP master station feeds the signals back to the DP slave station respectively.
3. The clinker ex-warehouse automatic control system according to claim 1, characterized in that: the first conveyor, the second conveyor and the third conveyor in the conveying system respectively correspond to the three discharge ports of the material warehouse, and the channel inlets of the first conveyor, the second conveyor and the third conveyor are respectively positioned below the three discharge ports.
4. The clinker ex-warehouse automatic control system according to claim 1, characterized in that: the control cabinet in the power control system is arranged in a kiln head power chamber, the output end of the control cabinet is connected with the DP slave station, and the PLC outputs signals to the DP slave station so as to control the output of electric signals of the control cabinet.
5. The clinker ex-warehouse automatic control system according to claim 1, characterized in that: the control system is based on a computer terminal, the PLC is in network connection with the computer terminal, and the computer terminal performs programming control on the PLC and is used for outputting signals to a DP master station by the PLC;
the control room is loaded with a central control image operation system, signal input ends of the central control image operation system are respectively connected with an outlet end of the material warehouse, an input end and an output end of the transmission system, and are used for monitoring an operation process by an operator in real time, and the signal input ends of the central control image operation system are connected with cameras and are used for image real-time acquisition and transmission feedback.
6. The clinker ex-warehouse automatic control system according to claim 5, characterized in that: the operation flow of the central control picture operation system is as follows:
the camera at the signal input end of the central control picture operating system respectively collects the inlet pictures of the discharge port and the transmission system and uploads the inlet pictures to the central control picture operating system;
and the central control picture operating system transmits the digital signals to a computer terminal for an operator to check the running process in real time.
7. The clinker ex-warehouse automatic control system according to claim 1, characterized in that: the operation flow of the clinker ex-warehouse control system is as follows:
s1: an operator programs a PLC controller through a computer terminal, the PLC controller runs a programming program and sends signals to a DP master station and an electric flow valve;
s2: after the PLC controller transmits the signals to the DP master station, the DP master station transmits the signals to the DP slave stations respectively;
s3: the electric flow valves respectively control the clinker discharge amount in the discharge hole of the silo, and the DP master station and the DP slave station respectively control the running speeds of the first conveyor, the second conveyor and the third conveyor to realize the control of automatic clinker discharge from the silo;
s4: and the central control picture operating system transmits the digital signals to a computer terminal for an operator to check the running process in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110616278.1A CN113311780A (en) | 2021-06-02 | 2021-06-02 | Automatic control system for discharging clinker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110616278.1A CN113311780A (en) | 2021-06-02 | 2021-06-02 | Automatic control system for discharging clinker |
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| Publication Number | Publication Date |
|---|---|
| CN113311780A true CN113311780A (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110616278.1A Pending CN113311780A (en) | 2021-06-02 | 2021-06-02 | Automatic control system for discharging clinker |
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Application publication date: 20210827 |