Dust removal filter screen device

Abstract

The utility model provides a dust removal filter screen device, and relates to the technical field of dust removal devices, the device comprises a filter screen, a support frame and a cleaning assembly; the filter screen is arranged on the support frame and is in sliding connection with the support frame; the cleaning assembly comprises a brush, the brush is installed on the supporting frame, and the brush is configured to abut against the filter screen to clean the filter screen when the filter screen slides relative to the supporting frame. According to the dust removal filter screen device, the brush is arranged on the outer side of the filter screen, and the filter screen is in contact with the brush after sliding along the supporting frame for a certain distance, so that cleaned impurities cannot enter an air exchange passage of equipment, and the cleaned impurities do not need to be collected. According to the device, the cleaned impurities do not need to be collected, so that the impurities cleaned by the filter screen do not need to be manually cleaned in the later period.

Description

Technical Field

[0001] This application relates to the field of dust removal equipment technology, and in particular to a dust removal filter device. Background Technology

[0002] In some equipment that requires air exchange, filters need to be installed in the air exchange path to prevent dust, lint, and other impurities from entering the equipment and affecting its normal operation. After prolonged use, the filter surface will become severely clogged, at which point the filter needs to be cleaned.

[0003] Manual cleaning of filters typically involves removing and washing or sweeping them. However, the cumbersome disassembly and assembly of filters, coupled with the large number of filters, results in significant workload for workers. Current technology allows for automatic cleaning of filters by using a vacuum cleaner to suck accumulated impurities into a dust collection box. However, the dust collection box has a limited capacity, still requiring frequent manual cleaning, which remains a considerable amount of work. Utility Model Content

[0004] This application provides a dust removal filter device to solve the technical problem that existing filters require frequent manual cleaning, which is labor-intensive.

[0005] This application provides a dust removal filter device, the device comprising: a filter screen, a support frame, and a cleaning assembly;

[0006] The filter screen is disposed on the support frame, and the filter screen is slidably connected to the support frame;

[0007] The cleaning assembly includes a brush mounted on the support frame, the brush being configured to abut against the filter screen as the filter screen slides relative to the support frame to clean the filter screen.

[0008] In the preferred embodiment of the dust removal filter device described above, the lateral length of the support frame is greater than the lateral length of the filter screen, and the cleaning component and the filter screen are arranged laterally offset on the support frame.

[0009] In the preferred embodiment of the dust removal filter device described above, the cleaning component further includes a blower mechanism, which includes at least one blower pipe and multiple nozzles;

[0010] The blower pipe is connected to the support frame, and the blower pipe is located on one side of the brush and is arranged along the length of the brush.

[0011] Each of the nozzles is installed at intervals on the air duct, and the nozzles are oriented toward the filter screen.

[0012] In the preferred embodiment of the dust removal filter device described above, the cleaning component further includes a brush cleaning mechanism, which includes: a bracket, a comb, and a brush moving mechanism;

[0013] The bracket is mounted on the support frame;

[0014] The comb mesh is connected to the bracket, and the bristles of the brush pass through the mesh openings of the comb mesh;

[0015] The brush moving mechanism is configured to drive the brush to move relative to the comb so that the comb combs the bristles of the brush.

[0016] In the preferred embodiment of the dust removal filter device described above, the brush moving mechanism includes a sliding rod, a spring, and a push-pull mechanism;

[0017] One end of the sliding rod is fixed to the upper end of the brush, and the other end of the sliding rod passes through the through hole on the bracket and is slidably connected to the bracket. The spring is sleeved on the sliding rod, and the two ends of the spring abut against the upper end of the brush and the lower end of the bracket, respectively.

[0018] The push-pull mechanism is connected to the brush, and the push-pull mechanism is configured to drive the sliding rod to slide within the through hole on the bracket, so that the brush moves relative to the comb along the length direction of the sliding rod.

[0019] In the preferred embodiment of the dust removal filter device described above, the push-pull mechanism includes a pull rod, which is connected to the brush.

[0020] In the preferred embodiment of the dust removal filter device described above, the push-pull mechanism includes an electric push rod connected to the brush, which is used to drive the brush to move relative to the comb.

[0021] In the preferred embodiment of the dust removal filter device described above, the device further includes a drive mechanism configured to drive the filter screen to move relative to the support frame.

[0022] In the preferred embodiment of the dust removal filter device described above, the driving mechanism includes: a drive motor, a lead screw, and a first connecting member;

[0023] The lead screw is arranged along the moving direction of the filter screen, and the lead screw is rotatably connected to the support frame. The drive motor is connected to the support frame, and the lead screw is connected to the output end of the drive motor. The lead screw is threadedly connected to the first connecting member, and the first connecting member is connected to the filter screen.

[0024] In the preferred embodiment of the dust removal filter device described above, the driving mechanism further includes: a guide rod and a second connecting member;

[0025] The guide rod is fixed to the support frame along the moving direction of the filter screen, the second connector is slidably connected to the guide rod, and the second connector is connected to the filter screen.

[0026] In the preferred embodiment of the dust removal filter device described above, the driving mechanism further includes a slider and a slide rail. The slide rail is arranged along the moving direction of the filter, the slider is fixed to the filter, and the slider and the slide rail are slidably connected.

[0027] This application provides a dust removal filter device. In practical applications, the filter is positioned directly opposite the air exchange passage of the equipment, thereby filtering impurities from the air and preventing them from entering the equipment through the air exchange passage. Since the brush is located outside the filter, the filter slides a certain distance along the support frame before contacting the brush. Thus, the brush is effectively outside the air exchange passage, and the cleaning of the filter by the brush also occurs outside the air exchange passage, preventing the cleaned impurities from entering the equipment's air exchange passage. Therefore, there is no need to collect the cleaned impurities. Because this device eliminates the need to collect the cleaned impurities, manual cleaning of the filter is also unnecessary. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] Figure 1 This is a schematic diagram of a dust removal filter device provided in an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of brush cleaning provided in an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of a cleaning assembly with a blower mechanism provided in an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of a blower mechanism provided in an embodiment of this application;

[0033] Figure 5 This is a schematic diagram of a cleaning component with a brush cleaning mechanism provided in an embodiment of this application;

[0034] Figure 6 This is a schematic diagram of a dust removal filter device with a drive mechanism provided in an embodiment of this application;

[0035] Figure 7 This is a schematic diagram of the guide rod and the second connector provided in an embodiment of this application;

[0036] Figure 8 This is a cross-sectional view of the slider and slide rail provided in the embodiments of this application;

[0037] Figure 9 This is a schematic diagram of the slider provided in an embodiment of this application.

[0038] Figure label:

[0039] 1000-Filter Screen;

[0040] 2000-Support Frame;

[0041] 3000-Cleaning Components;

[0042] 3100 - Brush;

[0043] 3200-Hair dryer mechanism;

[0044] 3210 - Air blower tube;

[0045] 3220 - Nozzle;

[0046] 3230 - Air Inlet;

[0047] 3300 - Brush cleaning mechanism;

[0048] 3310 - Bracket;

[0049] 3320 - Comb mesh;

[0050] 3330 - Brush moving mechanism;

[0051] 3331 - Sliding rod;

[0052] 3332 - Spring;

[0053] 3333 - Pull rod;

[0054] 4000 - Drive mechanism;

[0055] 4100 - Drive motor;

[0056] 4200-lead screw;

[0057] 4300 - First connector;

[0058] 4400 - Guide rod;

[0059] 4500 - Second connector;

[0060] 4600 - Slider;

[0061] 4700-Slide Rail;

[0062] 5000 - Radiator housing;

[0063] 6000 - Support Platform.

[0064] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0065] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0066] A radiator is a typical device with air exchange pathways. Many radiators are installed in open-air environments and cool by air. However, due to the presence of dust and impurities in the environment, the filter screen can become clogged after prolonged use, affecting the radiator's cooling efficiency. Therefore, it is necessary to clean the radiator's filter screen.

[0067] Manual cleaning of filters typically involves removing and washing or sweeping them. However, the cumbersome disassembly and assembly of filters, coupled with their large number, leads to significant labor intensity for workers. Existing technologies can automatically clean filters by using a dust collection device to suck accumulated impurities into a dust collection box. However, the dust collection box has limited capacity, still requiring frequent manual cleaning, resulting in a substantial workload. This is especially true for filters on wind turbine converter radiators, which are mounted high on the tower, making manual cleaning extremely difficult. Therefore, to address the technical problem of frequent manual cleaning of existing filters, this application proposes a dust removal filter device comprising a filter, a support frame, and a cleaning assembly. Both the cleaning assembly and the filter are mounted on the support frame. The cleaning assembly includes a brush mounted on the support frame. After the filter slides along the support frame and contacts the brush, the brush completes the cleaning of the filter.

[0068] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0069] In one possible embodiment of this application, a dust removal filter device is provided. Figure 1 This is a schematic diagram of a dust removal filter device provided in an embodiment of this application, as shown below. Figure 1 As shown, the device includes: a filter screen 1000, a support frame 2000, and a cleaning assembly 3000;

[0070] The filter screen 1000 is mounted on the support frame 2000, and the filter screen 1000 is slidably connected to the support frame 2000. For example... Figure 1 As shown, the filter 1000 has mesh, which enables it to filter dust and impurities from the air. Figure 1 The installation positions and shapes of the filter screen 1000 and the support frame 2000 are for illustrative purposes only. This application does not limit the installation positional relationship between the filter screen 1000 and the support frame 2000, nor the specific shapes of the filter screen 1000 and the support frame 2000. To solve the aforementioned technical problem, the length of the support frame 2000 is greater than the length of the filter screen 1000 in the same direction. The cleaning assembly 3000 and the filter screen 1000 are staggered in the same direction of the support frame 2000, so that the filter screen 1000 can only contact the cleaning assembly 3000 after sliding along the support frame 2000. The purpose of this design is that, in practical applications, the filter 1000 faces the air exchange passage, while the cleaning component 3000 can be placed outside the filter 1000, i.e., outside the air exchange passage. Thus, when cleaning is required, the filter 1000 can slide along the support frame 2000 until it contacts the cleaning component 3000, allowing the cleaning component 3000 to clean the filter 1000 outside the air exchange passage. Because cleaning occurs outside the air exchange passage, the dust and impurities removed will not enter the air exchange passage, eliminating the need for a dust collection box. The filter 1000 can be driven to slide along the support frame 2000 in various ways; preferably, it can be driven by a motor to achieve automatic cleaning.

[0071] It should be noted that, Figure 1 The illustration shows a preferred embodiment where the lateral dimension of the support frame 2000 is greater than the lateral length of the filter screen 1000, and the filter screen 1000 slides left and right along the lateral direction of the support frame 2000 to contact the cleaning assembly 3000. Optionally, the longitudinal length of the support frame 2000 can also be greater than the longitudinal length of the filter screen 1000, and the filter screen 1000 slides up and down along the support frame 2000 to contact the cleaning assembly 3000. In this case, the cleaning assembly 3000 should be positioned below the filter screen 1000 to prevent dust and impurities from entering the air exchange passage.

[0072] like Figure 1As shown, when the dust removal filter device provided in this embodiment is applied to a radiator, the support frame 2000 can be installed on the support platform 6000, and the filter 1000 can be directly facing the air exchange passage of the radiator housing 5000.

[0073] Figure 2 This is a schematic diagram of brush cleaning provided in an embodiment of this application, as shown below. Figure 2 As shown, the cleaning assembly 3000 includes a brush 3100 mounted on a support frame 2000. The brush 3100 is configured to abut against the filter screen 1000 when the filter screen 1000 slides relative to the support frame 2000 to clean the filter screen 1000.

[0074] Specifically, such as Figure 2 As shown, the brush 3100 and the filter screen 1000 are offset from each other in the same direction on the support frame 2000. The filter screen 1000 is positioned along... Figure 2 The brush slides in the direction of the middle arrow and contacts the bristles of the brush 3100 at the position indicated by the dotted line, thereby enabling the brush 3100 to clean the filter screen 1000. In this application, the bristles of the brush 3100 are facing towards the filter screen 1000, so that after the filter screen 1000 slides under the brush 3100, the bristles abut against the mesh surface of the filter screen 1000, thus completing the cleaning of the filter screen 1000.

[0075] In one possible embodiment of this application, a cleaning assembly with a blower mechanism is provided. Figure 3 This is a schematic diagram of a cleaning component with a blower mechanism provided in an embodiment of this application, as shown below. Figure 3 As shown, the cleaning assembly 3000 also includes a blower mechanism 3200, which includes at least one blower tube 3210 and a plurality of nozzles 3220.

[0076] The blower pipe 3210 is connected to the support frame 2000. The blower pipe 3210 is located on one side of the brush 3100 and is laid out along the length of the brush 3100.

[0077] Each nozzle 3220 is installed at intervals on the air blowing pipe 3210, and the nozzle 3220 faces the filter screen 1000.

[0078] Figure 4 This is a schematic diagram of a blower mechanism provided in an embodiment of this application. Please refer to it. Figure 3 , Figure 4 The air blower 3210, arranged along the length of the brush 3100, can blow air onto the filter 1000 through multiple nozzles 3220 to improve the cleaning effect on the filter 1000. Figure 3As shown, the nozzle 3220 can be configured to be biased towards the bristles of the brush 3100. This design takes into account that after long-term cleaning, the bristles of the brush 3100 may accumulate a lot of dust and impurities, reducing the cleaning ability of the brush 3100. By spraying airflow into the bristles through the nozzle 3220, the dust and impurities accumulated between the bristles can be blown off, thus avoiding the need for manual cleaning of the bristles. Figure 3 , Figure 4 Preferably, there can be two blower tubes 3210 to improve the blowing effect.

[0079] One end of the blower pipe 3210 can be provided with an air inlet 3230, which can be connected to a compressed air cylinder. An electrically controlled valve is provided on the air inlet 3230, so that the compressed gas in the compressed air cylinder can be remotely controlled to enter the blower pipe 3210 to clean the filter screen 1000 and the brush 3100.

[0080] In one possible embodiment of this application, a cleaning assembly with a brush cleaning mechanism is provided. Figure 5 This is a schematic diagram of a cleaning component with a brush cleaning mechanism provided in an embodiment of this application, as shown below. Figure 5 As shown, the cleaning assembly 3000 also includes a brush cleaning mechanism 3300, which includes: a bracket 3310, a comb 3320, and a brush moving mechanism 3330.

[0081] Bracket 3310 is mounted on support frame 2000;

[0082] The comb mesh 3320 is connected to the bracket 3310, and the bristles of the brush 3100 pass through the mesh of the comb mesh 3320;

[0083] like Figure 5 As shown, optionally, the brush moving mechanism 3330 includes a sliding rod 3331, a spring 3332, and a push-pull mechanism;

[0084] One end of the sliding rod 3331 is fixed to the upper end of the brush 3100, and the other end of the sliding rod 3331 passes through the through hole on the bracket 3310 and is slidably connected to the bracket 3310. A spring 3332 is sleeved on the sliding rod 3331, and the two ends of the spring 3332 abut against the upper end of the brush 3100 and the lower end of the bracket 3310, respectively.

[0085] The push-pull mechanism is connected to the brush 3100. The push-pull mechanism is configured to drive the sliding rod 3331 to slide in the through hole on the bracket 3310, so that the brush 3100 moves relative to the comb 3320 along the length of the sliding rod 3331.

[0086] It should be noted that, after prolonged use, a significant amount of dust and impurities can accumulate between the bristles of the brush 3100. In this embodiment, for example... Figure 5As shown, the bristles below the brush 3100 pass through the comb 3320. By pushing and pulling the brush 3100 up and down, the brush 3100 and the comb 3320 move relative to each other, so that the comb 3320 can scrape off the dust and impurities stuck between the bristles.

[0087] In this embodiment, the lower end of the sliding rod 3331 is fixed to the upper end of the brush 3100, and the upper end of the sliding rod 3331 passes through the through hole on the bracket 3310 and is slidably connected to the bracket 3310. The upper end of the sliding rod 3331 is limited by a nut. The function of the spring 3332 on the sliding rod 3331 is that when the brush 3100 is pulled up, the brush 3100 slides along the length of the sliding rod 3331, and the comb 3320 moves relative to the brush bristles, thereby cleaning the brush bristles with the comb 3320. After the brush 3100 is stopped from being pulled up, the brush 3100 returns to its original position under the action of the spring 3332. In this way, after the filter screen 1000 slides below the brush 3100, the brush bristles can still clean the filter screen 1000.

[0088] like Figure 5 As shown, the push-pull mechanism may include a pull rod 3333, which is connected to the brush 3100. Pulling the pull rod 3333 causes the brush 3100 to rise. The push-pull mechanism may also be an electric push rod, whose reciprocating motion causes the brush 3100 to rise or fall.

[0089] In one possible embodiment of this application, a dust removal filter device with a drive mechanism is provided. Figure 6 This is a schematic diagram of a dust removal filter device with a drive mechanism provided in an embodiment of this application, as shown below. Figure 6 As shown, the device also includes a drive mechanism 4000, which is configured to drive the filter 1000 to move relative to the support frame 2000.

[0090] The drive mechanism 4000 includes: a drive motor 4100, a lead screw 4200, and a first connecting member 4300;

[0091] The lead screw 4200 is arranged along the moving direction of the filter screen 1000, and the lead screw 4200 is rotatably connected to the support frame 2000. The drive motor 4100 is connected to the support frame 2000, and the lead screw 4200 is connected to the output end of the drive motor 4100. The lead screw 4200 is threadedly connected to the first connector 4300, and the first connector 4300 is connected to the filter screen 1000.

[0092] In this embodiment, the output of the drive motor 4100 is controlled to rotate, thereby driving the lead screw 4200 to rotate. The rotation of the lead screw 4200 can drive the first connecting member 4300 to move along the lead screw 4200 via a threaded drive. Since the first connecting member 4300 is connected to the filter screen 1000, it can drive the filter screen 1000 to move along the lead screw 4200. This design avoids the need for manual pulling of the filter screen 1000.

[0093] Figure 7 This is a schematic diagram of the guide rod and the second connector provided in an embodiment of this application, as shown below. Figure 7 As shown, the drive mechanism 4000 also includes: a guide rod 4400 and a second connector 4500;

[0094] The guide rod 4400 is fixed on the support frame 2000 along the moving direction of the filter screen 1000. The second connector 4500 is slidably connected to the guide rod 4400 and connected to the filter screen 1000.

[0095] By setting the guide rod 4400 and the second connector 4500, when the filter screen 1000 moves along the lead screw 4200, the filter screen 1000 can drive the second connector 4500 to slide along the guide rod 4400, which can improve the stability of the filter screen 1000 when it moves.

[0096] Figure 8 This is a cross-sectional view of the slider and slide rail provided in an embodiment of this application. For example... Figure 8 As shown, the drive mechanism 4000 also includes a slider 4600 and a slide rail 4700. The slide rail 4700 is arranged along the moving direction of the filter screen 1000 and can be mounted on the radiator housing 5000. The slider 4600 is fixed to the filter screen 1000, and the slider 4600 and the slide rail 4700 are slidably connected. By setting the slider 4600 and the slide rail 4700, the filter screen 1000 can be made more stable when moving.

[0097] Figure 9 This is a schematic diagram of the slider provided in an embodiment of this application, as shown below. Figure 9 As shown, there can be two sliders 4600, one above and one below the filter 1000. By setting multiple sliders 4600, the stability of the movement of the filter 1000 can be further improved.

[0098] Finally, it should be noted that other embodiments of this utility model will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A dust removal filter device, characterized in that, The device includes: a filter screen (1000), a support frame (2000), and a cleaning assembly (3000); The filter screen (1000) is disposed on the support frame (2000), and the filter screen (1000) is slidably connected to the support frame (2000); The cleaning assembly (3000) includes a brush (3100) mounted on the support frame (2000) and configured to abut against the filter screen (1000) as the filter screen (1000) slides relative to the support frame (2000) to clean the filter screen (1000).

2. The apparatus according to claim 1, characterized in that, The cleaning assembly (3000) also includes a blower mechanism (3200), which includes at least one blower tube (3210) and a plurality of nozzles (3220). The blower pipe (3210) is connected to the support frame (2000). The blower pipe (3210) is located on one side of the brush (3100) and is arranged along the length of the brush (3100). Each of the nozzles (3220) is spaced apart on the air duct (3210), and the nozzles (3220) face the filter screen (1000).

3. The apparatus according to claim 1, characterized in that, The cleaning assembly (3000) also includes a brush cleaning mechanism (3300), which includes: a bracket (3310), a comb (3320), and a brush moving mechanism (3330). The bracket (3310) is mounted on the support frame (2000); The comb mesh (3320) is connected to the support (3310), and the bristles of the brush (3100) pass through the mesh of the comb mesh (3320); The brush moving mechanism (3330) is configured to drive the brush (3100) to move relative to the comb (3320) so that the comb (3320) combs the bristles of the brush (3100).

4. The apparatus according to claim 3, characterized in that, The brush moving mechanism (3330) includes a sliding rod (3331), a spring (3332), and a push-pull mechanism; One end of the sliding rod (3331) is fixed to the upper end of the brush (3100), and the other end of the sliding rod (3331) passes through the through hole on the bracket (3310) and is slidably connected to the bracket (3310). The spring (3332) is sleeved on the sliding rod (3331), and the two ends of the spring (3332) abut against the upper end of the brush (3100) and the lower end of the bracket (3310) respectively. The push-pull mechanism is connected to the brush (3100). The push-pull mechanism is configured to drive the sliding rod (3331) to slide in the through hole on the bracket (3310) so that the brush (3100) moves relative to the comb (3320) along the length direction of the sliding rod (3331).

5. The apparatus according to claim 4, characterized in that, The push-pull mechanism includes a pull rod (3333), which is connected to the brush (3100).

6. The apparatus according to claim 4, characterized in that, The push-pull mechanism includes an electric push rod connected to the brush (3100), which is used to drive the brush (3100) to move relative to the comb (3320).

7. The apparatus according to claim 1, characterized in that, The device further includes a drive mechanism (4000) configured to drive the filter (1000) to move relative to the support frame (2000).

8. The apparatus according to claim 7, characterized in that, The drive mechanism (4000) includes: a drive motor (4100), a lead screw (4200), and a first connecting member (4300). The lead screw (4200) is arranged along the moving direction of the filter screen (1000), and the lead screw (4200) is rotatably connected to the support frame (2000). The drive motor (4100) is connected to the support frame (2000), and the lead screw (4200) is connected to the output end of the drive motor (4100). The lead screw (4200) is threadedly connected to the first connector (4300), and the first connector (4300) is connected to the filter screen (1000).

9. The apparatus according to claim 7, characterized in that, The drive mechanism (4000) further includes: a guide rod (4400) and a second connector (4500). The guide rod (4400) is fixed on the support frame (2000) along the moving direction of the filter screen (1000), the second connector (4500) is slidably connected to the guide rod (4400), and the second connector (4500) is connected to the filter screen (1000).

10. The apparatus according to claim 7, characterized in that, The drive mechanism (4000) further includes a slider (4600) and a slide rail (4700). The slide rail (4700) is arranged along the moving direction of the filter screen (1000). The slider (4600) is fixed on the filter screen (1000), and the slider (4600) and the slide rail (4700) are slidably connected.

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