Intelligent dust collector and dust removal method

Abstract

The present invention relates to the technical field of dust collectors, and discloses an intelligent dust collector and dust removal method, comprising: a dust collection bag, a dust collection module, a dust discharge module, and a control module, wherein the dust collection module has a first end inputted with alternating current (AC) and a second end connected to a first end of the control module; the dust discharge module has a first end inputted with AC and a second end connected to a second end of the control module; and the control module is configured to control the startup of the dust collection module and, during startup of the dust collection module, detect the pressure difference between the inside and outside of the dust collection bag and the frequency of the dust collection module to control the dust collection air volume of the dust collection module and determine the startup time of the dust discharge module to discharge dust from the dust collection bag. During dust collection, in order to facilitate the removal of dust from the dust collection bag, the control module detects the pressure difference between the inside and outside of the dust collection bag in real time and determines whether the pressure difference is within an optimal preset dust removal pressure difference range. If the pressure difference is not within the optimal preset dust removal pressure difference range, the control module determines whether the frequency of the dust collection module reaches a limit value. If the frequency of the dust collection module reaches the limit value, the dust discharge module is activated to discharge dust, thereby solving the problem of how to timely discharge dust from the dust collector.

Description

Technical Field

[0001] The present invention relates to the technical field of dust collectors, and in particular to an intelligent dust collector and a dust removal method. Background Art

[0002] Traditional dust collectors are controlled by a contactor that starts and stops the fan and dust discharge motor, and a pulse generator that controls the backflush valve. During operation, a time relay is used to periodically backflush the dust collector bags or filter cartridges. This method has the following disadvantages: 1. Backflush is based on the start-up time, and the dust accumulation level in the dust collector is uncertain; 2. The dust collection air volume is affected by dust accumulation. When dust accumulation is low, high air volume tends to absorb raw materials; when dust accumulation is high, low air volume tends to reduce dust removal effectiveness; 3. Dust discharge is difficult to handle in a timely manner, which can easily cause secondary pollution. Summary of the Invention

[0003] In view of this, the present invention provides an intelligent dust collector and a dust removal method to solve the problem of how to discharge dust from the dust collector in a timely manner.

[0004] In the first aspect, the present invention provides an intelligent dust collector, comprising: a dust collection bag, a dust collection module, a dust discharge module, and a control module, wherein the dust collection module has a first end that inputs alternating current, and a second end that is connected to the first end of the control module; the dust discharge module has a first end that inputs alternating current, and a second end that is connected to the second end of the control module; the control module is used to control the start-up of the dust collection module, and during the start-up of the dust collection module, detects the pressure difference between the inside and outside of the dust collection bag and the frequency of the dust collection module to control the dust collection air volume of the dust collection module and determine the start-up time of the dust discharge module to discharge dust from the dust collection bag.

[0005] During dust removal, in order to facilitate the removal of dust from the dust bag, the control module detects the pressure difference between the inside and outside of the dust bag in real time, and determines whether the pressure difference is within the optimal preset dust removal pressure difference range. When the pressure difference is not within the optimal preset dust removal pressure difference range, it determines whether the frequency of the dust removal module reaches the limit. When the frequency of the dust removal module reaches the limit, the dust discharge module is started to discharge the dust, thereby solving the problem of how the dust collector can discharge the dust in time.

[0006] In an optional embodiment, the dust removal module includes: a frequency converter and a dust removal fan, wherein the frequency converter has a first end that inputs alternating current, a second end that is connected to the first end of the dust removal fan, and a third end that is connected to the first end of the control module; the dust removal fan has a second end that is connected to the first end of the control module; the control module controls the start-up of the dust removal fan, and during the start-up of the dust removal fan, detects the pressure difference between the inside and outside of the dust bag and the frequency of the dust removal fan, and controls the frequency converter to convert the alternating current and then transmit it to the dust removal fan to control the dust collection air volume of the dust removal fan.

[0007] In an optional embodiment, the dust removal module includes: an air bag, a solenoid valve, a first normally open switch, a dust removal motor and a dust collection bag, wherein the air bag is placed in the dust collection bag; the solenoid valve is connected to the air bag and the second end of the control module; the first normally open switch, the first end of which inputs alternating current, and the second end of which is connected to the first end of the dust removal motor; the second end of the ash removal motor is connected to the second end of the control module; during the startup of the dust removal module, the control module detects the frequency of the dust removal module. When the frequency of the dust removal module reaches the limit value, the control module controls the first normally open switch to close, the solenoid valve to open, the ash removal motor to start, and the air bag to exhaust, so as to discharge the dust in the dust collection bag into the dust collection bag.

[0008] In an optional embodiment, the ash discharge module further includes: a first end of the first normally open switch inputs alternating current through a first circuit breaker.

[0009] In an optional embodiment, the control module includes: a differential pressure sensor, a dust removal control circuit, an ash discharge control circuit, a PLC control circuit and a feedback circuit, wherein the differential pressure sensor, a first end of which is connected to the first end of the PLC control circuit; the ash discharge control circuit, a first end of which inputs a power supply voltage, a second end of which is connected to the second end of the PLC control circuit, and a third end of which is connected to the second end of the ash discharge module; a feedback circuit, a first end of which is connected to the first end of the dust removal module, and a second end of which is connected to the third end of the PLC control circuit; the differential pressure sensor sends the pressure difference between the inside and outside of the dust bag to the PLC control circuit, and the feedback circuit sends the acquired frequency of the dust removal module to the PLC control circuit; the PLC control circuit is turned on through the ash discharge control circuit to start the ash discharge module; during dust removal, the PLC control circuit controls the dust collection air volume of the dust removal module and determines the start time of the ash discharge module based on the pressure difference between the inside and outside of the dust bag and the frequency of the dust removal module for ash discharge.

[0010] In an optional embodiment, the dust removal control circuit includes: a second normally open switch and a first relay, wherein the first end of the second normally open switch is connected to the live wire, the second end is connected to the neutral wire through the first relay, the third end is connected to the second end of the PLC control circuit, and the fourth end is connected to the second end of the dust removal module.

[0011] In an optional embodiment, the dust removal module further includes: a cooling module, a first end of which inputs alternating current, and a second end of which is connected to a third end of the control module; during dust removal, when the dust removal module is started, the cooling module is controlled to start.

[0012] In an optional embodiment, the cooling module includes: a third normally open switch and a cooling fan, wherein the third normally open switch has a first end that inputs AC power, a second end that is connected to the cooling fan, and a third end that is connected to the third end of the control module.

[0013] In an optional embodiment, the control module also includes: a cooling fan control circuit, a first end of which inputs a power supply voltage, a second end of which is connected to the fourth end of the PLC control circuit, and a third end of which is connected to the second end of the cooling module; the PLC control circuit starts the cooling module by controlling the cooling fan control circuit to be turned on.

[0014] In an optional embodiment, the cooling fan control circuit includes: a fourth normally open switch and a second relay, wherein the first end of the fourth normally open switch is connected to the live wire, the second end of the fourth normally open switch is connected to the neutral wire through the second relay, the third end of the fourth end of the PLC control circuit is connected to the fourth end of the cooling module.

[0015] In the second aspect, the present invention provides a dust removal method, which is applied to the intelligent dust collector of the first aspect and any optional embodiment thereof, and the method includes: the control module controls the start-up of the dust removal module; the control module detects the pressure difference between the inside and outside of the dust bag and the frequency of the dust removal module, and determines whether the pressure difference is within the preset dust removal pressure difference range; when the pressure difference is not within the preset dust removal pressure difference range, determines whether the frequency of the dust removal module reaches the limit value; when the frequency of the dust removal module reaches the limit value, the control module controls the start-up of the dust removal module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is a diagram showing the composition of a dust collector according to an embodiment of the present invention;

[0018] Figure 2 is a composition diagram of another dust collector according to an embodiment of the present invention;

[0019] Figure 3 is a composition diagram of another dust collector according to an embodiment of the present invention;

[0020] Figure 4 is a composition diagram of another dust collector according to an embodiment of the present invention;

[0021] Figure 5 1 is a specific circuit structure diagram of a dust collector according to an embodiment of the present invention;

[0022] Figure 6 is a composition diagram of another dust collector according to an embodiment of the present invention;

[0023] Figure 7is a specific circuit structure diagram of a feedback circuit according to an embodiment of the present invention;

[0024] Figure 8 1 is a specific circuit structure diagram of a PLC control circuit according to an embodiment of the present invention;

[0025] Figure 9 1 is a specific circuit structure diagram of the dust discharge control circuit according to an embodiment of the present invention;

[0026] Figure 10 is a composition diagram of another dust collector according to an embodiment of the present invention;

[0027] Figure 11 is a composition diagram of another dust collector according to an embodiment of the present invention;

[0028] Figure 12 is a specific circuit structure diagram of a cooling fan control circuit according to an embodiment of the present invention;

[0029] Figure 13 is a structural diagram of a dust collector according to an embodiment of the present invention;

[0030] Figure 14 It is a specific flow chart of the dust removal method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0032] In this embodiment, a smart dust collector is provided. Figure 1 As shown, it includes: a dust removal bag 1, a dust removal module 2, a dust discharge module 3, and a control module 4.

[0033] like Figure 1 As shown, the dust removal module 2 has a first end that inputs alternating current, and a second end that is connected to a first end of the control module 4 .

[0034] like Figure 1 As shown, the ash discharge module 3 has a first end that inputs alternating current, and a second end that is connected to the second end of the control module 4 .

[0035] Specifically, the control module 4 is used to control the startup of the dust removal module 2, and during the startup of the dust removal module 2, detect the pressure difference between the inside and outside of the dust removal bag 1 and the frequency of the dust removal module 2 to control the dust collection air volume of the dust removal module 2 and determine the startup time of the dust discharge module 3 to discharge the dust from the dust removal bag 1.

[0036] Specifically, when dust removal is performed, the control module 4 controls the dust removal module 2 to start, and the compressed air first enters the dust removal bag for a filtration, and then enters the dust removal module 2. The dust removal module 2 performs a secondary dust removal on the air and then discharges it.

[0037] Specifically, during the dust removal period, in order to facilitate the removal of dust from the dust bag 1, the control module 4 detects the pressure difference between the inside and outside of the dust bag 1 in real time, and determines whether the pressure difference is within the optimal preset dust removal pressure difference range. When the pressure difference is not within the optimal preset dust removal pressure difference range, it determines whether the frequency of the dust removal module 2 reaches the limit. When the frequency of the dust removal module 2 reaches the limit, the dust removal module 3 is started to discharge dust.

[0038] In some optional embodiments, such as Figure 2 As shown, the dust removal module 2 includes: a frequency converter 21 and a dust removal fan 22.

[0039] Specifically, the inverter 21 has a first end that inputs AC power, a second end that is connected to the first end of the dust removal fan 22 , and a third end that is connected to the first end of the control module 4 ; the dust removal fan 22 has a second end that is connected to the first end of the control module 4 .

[0040] Specifically, the control module 4 controls the activation of the dust removal fan 22. During the activation of the dust removal fan 22, it detects the pressure difference between the inside and outside of the dust bag 1 and the frequency of the dust removal fan 22. It then controls the frequency converter 21 to convert the frequency of the AC power and transmit it to the dust removal fan 22 to control the dust collection air volume of the dust removal fan 22. In other words, the dust collection air pressure can be preset according to the dust removal object. Then, the dust collection air volume of the dust collector can be constantly controlled by frequency conversion control of the dust removal fan 22 and differential pressure sensor detection of the pressure difference between the inside and outside of the dust collector to ensure the dust removal effect.

[0041] In some optional embodiments, such as Figure 3 As shown, the dust removal module 3 includes: an air bag, a solenoid valve, a first normally open switch KM1, an ash removal motor 31 and a dust collection bag 32, wherein the air bag is placed in the dust bag; the solenoid valve is connected to the air bag and the second end of the control module; the air bag and the solenoid valve are set in the position shown in FIG. Figure 13 shown.

[0042] like Figure 3 As shown, the first normally open switch KM1 has a first end inputting AC power and a second end connected to a first end of the ash discharge motor 31 ; the second end of the ash discharge motor 31 is connected to a second end of the control module 4 .

[0043] Specifically, during the startup of the dust removal module 2, the control module 4 detects the frequency of the dust removal module 2. When the frequency of the dust removal module 2 reaches the limit value, the control module 4 controls the first normally open switch KM1 to close and the solenoid valve to open, the dust discharge motor 31 is powered on and started, and the air bag is exhausted to discharge the dust in the dust bag 1 into the dust collecting bag 32.

[0044] In some optional embodiments, such as Figure 4 As shown, the ash discharge module 3 also includes a first normally open switch KM1, which receives AC power via a first circuit breaker Q2. When the ash discharge fan fails, the control module 4 or manual control can disconnect the first circuit breaker Q2 to disconnect the ash discharge module 3, facilitating inspection and maintenance of the ash discharge fan.

[0045] Optionally, the specific circuit structures of the dust removal module 2 and the dust removal module 3 are as follows: Figure 5 As shown, Q2 is the main circuit breaker. When it is turned off, the dust collector stops working.

[0046] In some optional embodiments, such as Figure 6 As shown, the control module 4 includes: a differential pressure sensor 41 , an ash discharge control circuit 42 , a PLC control circuit 43 and a feedback circuit 44 .

[0047] like Figure 6 As shown, the differential pressure sensor 41 has a first end connected to a first end of the PLC control circuit 43;

[0048] like Figure 6 As shown, the ash discharge control circuit 42 has a first end that inputs the power supply voltage, a second end that is connected to the second end of the PLC control circuit 43 , and a third end that is connected to the second end of the ash discharge module 3 .

[0049] like Figure 6 As shown, the feedback circuit 44 has a first end connected to the first end of the dust removal module 2, and a second end connected to the third end of the PLC control circuit 43. The feedback circuit 44 is structured as follows: Figure 7 shown.

[0050] Specifically, the differential pressure sensor 41 sends the pressure difference between the inside and outside of the dust bag 1 to the PLC control circuit 43, and the feedback circuit 44 sends the acquired frequency of the dust removal module 2 to the PLC control circuit 43; the PLC control circuit 43 starts the dust removal module 3 by controlling the dust removal control circuit 42 to be turned on; during dust removal, the PLC control circuit 43 controls the dust collection air volume of the dust removal module 2 and determines the start time of the dust removal module 3 based on the pressure difference between the inside and outside of the dust bag 1 and the frequency of the dust removal module 2 to perform dust removal.

[0051] Specifically, during dust removal, the differential pressure sensor 41 detects the pressure difference between the inside and outside of the dust bag 1, the feedback circuit 44 detects the frequency of the dust removal module 2, and the PLC control circuit 43 determines whether the pressure difference is within the preset dust removal pressure difference range; when the pressure difference is not within the preset dust removal pressure difference range, the PLC control circuit 43 determines whether the frequency of the dust removal module 2 reaches the limit value; when the frequency of the dust removal module 2 reaches the limit value, the PLC control circuit 43 controls the ash removal control circuit 42 to close to control the ash removal module 3 to start.

[0052] Alternatively, as Figure 8 As shown, the PLC control circuit 43 includes a PLC and peripheral circuits. The PLC has a mature PLC control method and program in the prior art, which will not be described in detail here.

[0053] Optionally, the control module should also include a human-machine interface, which is used to set some parameters, such as the object of dust removal (large particles, small particles), the dust removal mode (strong mode, energy-saving mode), the number of times the dust bag stores dust, etc.

[0054] In some optional embodiments, such as Figure 9 As shown, the dust discharge control circuit 42 includes: a second normally open switch K17 and a first relay KM4, wherein when the first relay KM4 is energized, Figure 5 The second normally open switch K17 in is closed.

[0055] Specifically, the second normally open switch K17 has a first end connected to the live wire, a second end connected to the neutral wire through the first relay KM4, a third end connected to the second end of the PLC control circuit 43, and a fourth end connected to the second end of the dust removal module 2.

[0056] In some optional embodiments, such as Figure 10 As shown, the dust removal module also includes: a cooling module 5, a first end of which inputs AC power, and a second end of which is connected to the third end of the control module 4; during dust removal, when the dust removal module is started, the cooling module 5 is controlled to start.

[0057] Optionally, as shown in 5, the cooling module 5 includes: a third normally open switch KM2 and a cooling fan 51, wherein the third normally open switch KM2 has a first end that inputs AC power, a second end that is connected to the cooling fan 51, and a third end that is connected to the third end of the control module 4.

[0058] In some optional embodiments, such as Figure 11 As shown, the control module 4 also includes: a cooling fan control circuit 45, a first end of which inputs a power supply voltage, a second end of which is connected to the fourth end of the PLC control circuit 43, and a third end of which is connected to the second end of the cooling module 5; the PLC control circuit 43 starts the cooling module 5 by controlling the cooling fan 51 control circuit to be turned on.

[0059] In some optional embodiments, such as Figure 12 As shown, the cooling fan control circuit 45 includes: a fourth normally open switch K18 and a second relay KM3, wherein the first end of the fourth normally open switch K18 is connected to the live wire, the second end thereof is connected to the neutral wire through the second relay KM3, the third end thereof is connected to the fourth end of the PLC control circuit 43, and the fourth end thereof is connected to the second end of the cooling module 5.

[0060] Optionally, the structure diagram of the dust collector of this embodiment is as follows Figure 13 As shown, the dust bag 1 is filtered with the dust gas once and then transported to the dust removal fan 22. The dust removal fan 22 discharges clean air after dust removal. When dust discharge is required, the dust is discharged into the dust discharge motor 31 by controlling the air bag and the solenoid valve. The dust discharge motor 31 rotates to bring the dust into the dust collecting bag 32.

[0061] This embodiment provides a dust removal method, which is applied to the intelligent dust collector of the above embodiment and any optional implementation manner, and the method includes:

[0062] (1) The control module 4 controls the dust removal module 2 to start;

[0063] (2) The control module 4 detects the pressure difference between the inside and outside of the dust removal bag 1 and the frequency of the dust removal module 2, and determines whether the pressure difference is within the preset dust removal pressure difference range;

[0064] (3) When the pressure difference is not within the preset dust removal pressure difference range, determine whether the frequency of the dust removal module 2 reaches the limit;

[0065] (4) When the frequency of the dust removal module 2 reaches the limit, the control module 4 controls the dust discharge module 3 to start.

[0066] The specific flow chart of dust removal method is as follows Figure 14 shown.

[0067] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An intelligent dust collector, characterized in that: include: Dust removal bag, dust removal module, dust discharge module, control module, among which, a dust removal module, a first end of which is input with alternating current, and a second end of which is connected to the first end of the control module; an ash discharge module, a first end of which is input with alternating current, and a second end of which is connected to the second end of the control module; a control module for controlling the startup of the dust removal module and, during the startup of the dust removal module, detecting the pressure difference between the inside and outside of the dust removal bag and the frequency of the dust removal module to control the dust collection air volume of the dust removal module and determine the startup time of the dust discharge module to discharge dust from the dust removal bag; The control module detects the pressure difference between the inside and outside of the dust removal bag in real time, and determines whether the pressure difference is within the optimal preset dust removal pressure difference range. When the pressure difference is not within the optimal preset dust removal pressure difference range, it determines whether the frequency of the dust removal module reaches the limit. When the frequency of the dust removal module reaches the limit, the dust removal module is started to discharge dust.

2. The intelligent dust collector according to claim 1, characterized in that: The dust removal module includes: a frequency converter and a dust removal fan, wherein: a frequency converter, a first end of which is input with alternating current, a second end of which is connected to the first end of the dust removal fan, and a third end of which is connected to the first end of the control module; The dust removal fan, the second end of which is connected to the first end of the control module The control module controls the start-up of the dust removal fan, and during the start-up of the dust removal fan, detects the pressure difference between the inside and outside of the dust bag and the frequency of the dust removal fan, and controls the frequency converter to convert the frequency of the AC power and then transmit it to the dust removal fan to control the dust collection air volume of the dust removal fan.

3. The intelligent dust collector according to claim 1, characterized in that: The dust removal module includes: an air bag, a solenoid valve, a first normally open switch, a dust removal motor and a dust collection bag, wherein: An air bag is placed in the dust removal bag; a solenoid valve connected to the air bag and the second end of the control module; a first normally open switch, a first end of which is input with alternating current, and a second end of which is connected to the first end of the ash discharge motor; an ash discharge motor, a second end of which is connected to the second end of the control module; During the startup of the dust removal module, the control module detects the frequency of the dust removal module. When the frequency of the dust removal module reaches a limit value, the control module controls the first normally open switch to close, the solenoid valve to open, the dust discharge motor to start, and the air bag to exhaust, so as to discharge the dust in the dust removal bag into the dust collecting bag.

4. The intelligent dust collector according to claim 3, characterized in that: The ash discharge module also includes: The first end of the first normally open switch inputs alternating current through a first circuit breaker.

5. The intelligent dust collector according to claim 3, characterized in that: The control module includes: a differential pressure sensor, an ash discharge control circuit, a PLC control circuit and a feedback circuit, wherein: a differential pressure sensor, a first end of which is connected to a first end of the PLC control circuit; an ash discharge control circuit, a first end of which is input with a power supply voltage, a second end of which is connected to the second end of the PLC control circuit, and a third end of which is connected to the second end of the ash discharge module; a feedback circuit, a first end of which is connected to the first end of the dust removal module, and a second end of which is connected to the third end of the PLC control circuit; The differential pressure sensor sends the pressure difference between the inside and outside of the dust removal bag to the PLC control circuit, and the feedback circuit sends the acquired frequency of the dust removal module to the PLC control circuit; The PLC control circuit starts the ash discharge module by controlling the ash discharge control circuit to be turned on; During dust removal, the PLC control circuit controls the dust collection air volume of the dust removal module and determines the start time of the dust removal module for dust removal based on the pressure difference between the inside and outside of the dust removal bag and the frequency of the dust removal module.

6. The intelligent dust collector according to claim 5, characterized in that: The dust removal control circuit includes: a second normally open switch and a first relay, wherein: A second normally open switch, whose first end is connected to the live wire, whose second end is connected to the neutral wire through the first relay, whose third end is connected to the second end of the PLC control circuit, and whose fourth end is connected to the second end of the dust removal module.

7. The intelligent dust collector according to claim 5, characterized in that: The dust removal module also includes: a cooling module, a first end of which is input with alternating current, and a second end of which is connected to the third end of the control module; During dust removal, when the dust removal module is started, the cooling module is controlled to start.

8. The intelligent dust collector according to claim 7, characterized in that: The cooling module includes: a third normally open switch and a cooling fan, wherein: A third normally open switch has a first end for inputting alternating current, a second end connected to the cooling fan, and a third end connected to the third end of the control module.

9. The intelligent dust collector according to claim 7, characterized in that: The control module further includes: a cooling fan control circuit, having a first end connected to a power supply voltage, a second end connected to a fourth end of the PLC control circuit, and a third end connected to the second end of the cooling module; The PLC control circuit starts the cooling module by controlling the cooling fan control circuit to be turned on.

10. The intelligent dust collector according to claim 9, characterized in that: The cooling fan control circuit includes: a fourth normally open switch and a second relay, wherein: A fourth normally open switch, having a first end connected to the live wire, a second end connected to the neutral wire through the second relay, a third end connected to the fourth end of the PLC control circuit, and a fourth end connected to the second end of the cooling module.

11. A dust removal method, characterized in that: Applied to the intelligent dust collector according to any one of claims 1 to 10, the method comprises: The control module controls the dust removal module to start; The control module detects the pressure difference between the inside and outside of the dust removal bag and the frequency of the dust removal module, and determines whether the pressure difference is within the preset dust removal pressure difference range; When the pressure difference is not within the preset dust removal pressure difference range, determining whether the frequency of the dust removal module reaches a limit value; When the frequency of the dust removal module reaches a limit, the control module controls the dust discharge module to start.

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