Manufacturing method of sunshade net

Abstract

The invention discloses a manufacturing method of a sunshade net, raw materials are made into a plastic film through heating equipment, the plastic film is conveyed through a conveying assembly, a positioning mechanism and dust collection equipment are matched to conduct dust collection treatment on the plastic film, and finally drying treatment is conducted through a drying assembly. The quality and the performance of the product are ensured, and the implementation of the steps has obvious effects on the aspects of improving the sunshade effect, the durability, the anti-aging performance and the like of the sunshade net.

Description

Technical Field

[0001] The invention relates to the technical field of sunshade nets, and in particular to a method for manufacturing a sunshade net. Background Art

[0002] Sunshade net, also known as shading net, is a new type of protective covering material specially used for agriculture, fishery, animal husbandry, windbreak, soil covering, etc. The sunshade net is mainly made of polyethylene and other polymer materials through special processing. It has the characteristics of lightness, durability, and anti-aging. The sunshade net in the prior art generally uses heating equipment to melt the raw materials and then extrude and cool them to form the material to be woven (plastic film). The existing equipment often uses a medium to cool the raw materials, but when the plastic film leaves the medium, impurities and dust in the air will adhere to the surface of the plastic film, affecting the quality and performance of the sunshade net. At the same time, there is cooling medium residue on the surface of the plastic film. The equipment in the prior art uses air cooling or other components to dry the plastic film. There are problems such as slow air flow of the medium on the surface of the sunshade net, slow evaporation of the medium, and low drying efficiency. Summary of the invention

[0003] The invention provides a method for manufacturing a sunshade net, which solves the above-mentioned problem.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The manufacturing method of the sunshade net is characterized by comprising the following steps:

[0006] The raw materials are melted by a heating device to form a plastic film;

[0007] The plastic mold is transported to the box through the conveying assembly for cooling;

[0008] A positioning mechanism is provided to position the plastic film;

[0009] A vacuum cleaner is provided to treat the surface of the plastic mold;

[0010] A drying component is provided to dry the plastic mold;

[0011] The raw materials are made into plastic film by heating equipment, the plastic film is transported by a conveying assembly, the positioning mechanism cooperates with the vacuuming equipment to vacuum the plastic film, and finally it is dried by a drying assembly. The manufacturing method of the sunshade net ensures the quality and performance of the product through a series of orderly and precise processing steps. The implementation of the steps has a significant effect on improving the sunshade effect, durability and anti-aging performance of the sunshade net.

[0012] Furthermore, the vacuum cleaner includes a suction unit, a vacuum duct, a vacuum joint connected to the vacuum duct, a filter component arranged in the vacuum duct, and a control system. The control system controls the suction unit to process the plastic film. The vacuum cleaner can efficiently absorb dust and impurities on the surface of the plastic film through powerful suction and optimized vacuum duct design, reduce erosion and damage to the sunshade net, thereby improving the durability and service life of the sunshade net and ensuring the appearance quality of the sunshade net. The control system can monitor the working status of the vacuum cleaner in real time, and adjust the working parameters of the suction unit as needed to realize intelligent control and management. The filter component collects and filters the absorbed dust and impurities to prevent them from being discharged into the environment, thereby achieving the goal of environmental protection and energy saving.

[0013] Furthermore, a vibration assembly is provided in the dust collection duct, and the vibration assembly includes a vibration motor connected to the dust collection duct, a vibration plate connected to the vibration motor, and an electromagnet connected to the vibration plate. A suction part is provided on the filter element, and the electromagnet cooperates with the suction part to realize the connection between the two. When the dust on the filter element accumulates to a certain extent, the control system will issue an instruction to start the vibration motor. The vibration motor generates a vibration force to drive the vibration plate to vibrate reciprocatingly. The vibration plate transmits the vibration force to the dust collection duct and the filter element, so that the dust and impurities on the filter element are vibrated and fall off. The vibration cleaning process can reduce the blockage and wear of the filter element, extend its service life, eliminate the need for frequent replacement of the filter element, and reduce maintenance costs.

[0014] Furthermore, a limiting groove is provided on the dust suction pipe, and the filter assembly includes a filter element. The filter element is provided with a limiting portion, and the limiting portion moves along the limiting groove to ensure that the moving trajectory of the filter assembly is stable and accurate. The cooperation between the limiting groove and the limiting portion can ensure the stability and accuracy of the filter assembly during the dust suction process. The design of the limiting groove can also prevent the filter assembly from deflecting or shaking during movement, thereby improving the dust suction efficiency.

[0015] Furthermore, the filter element includes a guide section, which is arranged in an arc shape. One end of the guide section is bent to form a blocking section. Impurities are centrally processed through the guide section and the blocking section. The guide section is designed in an arc shape. This shape helps to guide the impurities entering from the dust collection pipe to move along the arc trajectory. The blocking section is responsible for blocking and guiding the impurities to further concentrate and prevent them from entering the dust collection equipment and affecting the operation of the equipment, thereby improving the collection efficiency.

[0016] Furthermore, the positioning mechanism includes support frames arranged on both sides of the box body, a slide seat connected to the support frames, a moving block arranged on the slide seat, a positioning rod connected to the moving block, and a positioning wheel connected to the positioning rod. The position of the positioning wheel is adjusted by moving the moving block along the slide seat. When the position of the positioning wheel needs to be adjusted, the moving block is driven by the driving mechanism to move along the slide seat, and the moving block drives the positioning rod and the positioning wheel to move together until the desired position is reached. By adjusting the position and angle of the positioning wheel, precise contact and positioning of the positioning wheel and the dust collection surface can be achieved, thereby improving the dust collection efficiency and effect. At the same time, the positioning wheel contacts the surface of the plastic film to prevent the dust collection equipment from sucking up the plastic film when working, thereby having a restrictive effect.

[0017] Furthermore, the transport component includes a conveying roller group arranged in a box body, a transmission wheel cooperating with the conveying roller group, a transmission chain cooperating with the transmission wheel, and a motor cooperating with the transmission chain. The conveying roller group is driven to rotate by the rotation of the motor. The transport component is easy to replace, which helps to reduce maintenance costs and time. The transport component is suitable for scenarios where large amounts of materials are processed or long-distance transportation is required.

[0018] Furthermore, a cover body is provided on the upper cover of the box body, and a drying chamber is formed between the cover body and the box body. The drying assembly includes a burner, a hot air furnace, a fan and a hot air duct. The burner is connected to the hot air furnace, the hot air duct is connected to the hot air furnace, and the fan is connected to the hot air duct. The burner cooperates with the hot air furnace to generate high-temperature gas to dry the plastic film. The cooperation of the burner and the hot air furnace can generate high-temperature hot air to achieve fast and efficient drying effect. The hot air circulates in the drying chamber to ensure that the plastic film is evenly heated and avoid local overheating or uneven drying.

[0019] Furthermore, an air outlet channel is provided on the cover body, and the air outlet channel is communicated with the drying chamber. A filtering structure is provided in the air outlet channel. When the gas in the drying chamber passes through the air outlet channel, the filtering structure will intercept impurities such as dust and particulate matter therein, and then discharge them out to reduce the impact on the environment. The cooperation between the air outlet channel and the filtering structure can ensure that the gas in the drying chamber is quickly discharged, thereby improving the drying efficiency.

[0020] Furthermore, a heating fan is provided on the side of the box body, and a fan is connected to the rotating shaft of the heating fan. At least two fans are provided, and the two fans rotate in the same direction. The air in the drying chamber is stirred by the same rotation of the fans. Since the two fans rotate in the same direction, they will generate a common airflow direction, thereby stirring the air in the drying chamber. This stirring helps to make the air in the drying chamber more uniform, so that the hot air can be more evenly distributed on the plastic film, thereby improving the drying efficiency.

[0021] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0022] 1. The use of vacuum equipment can efficiently absorb dust and impurities on the surface of the plastic film, reducing its erosion and damage to the sunshade net, thereby improving the durability and service life of the sunshade net.

[0023] 2. A filter component is set in the dust collection equipment to collect and filter the sucked dust and impurities to prevent them from being discharged into the environment, thus achieving the goal of environmental protection and energy saving.

[0024] 3. At least two fans rotating in the same direction are provided on the inner side of the box to stir the air in the drying chamber. This stirring helps to make the air in the drying chamber more uniform, so that the hot air can be more evenly distributed on the plastic film, thereby improving the drying efficiency.

[0025] 4. A positioning mechanism is provided on one side of the vacuum cleaner, and the positioning wheel contacts the surface of the plastic film to prevent the vacuum cleaner from sucking up the plastic film during operation, thereby achieving a restrictive effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings:

[0027] Figure 1 A schematic structural diagram of an apparatus for manufacturing a sunshade net according to the present invention;

[0028] Figure 2 for Figure 1 A top view of

[0029] Figure 3 for Figure 2 Sectional view along AA direction;

[0030] Figure 4 for Figure 2 Axonometric section view at the middle BB;

[0031] Figure 5 for Figure 3 A partial enlarged view of point C in the middle;

[0032] Figure 6 It is a schematic diagram of the structure of the vibration component in the present invention;

[0033] Figure 7 It is a structural schematic diagram of the positioning mechanism in the present invention;

[0034] Figure 8 It is a structural schematic diagram of the filter element in the present invention;

[0035] Fig. 9 for Figure 8 A partial enlarged view of point D in the middle;

[0036] Fig.10 It is a schematic diagram of the partial structure of the dust collection device in the present invention;

[0037] Fig.11 for Fig.10 A top view of

[0038] Fig.12 for Fig.11 Axonometric section view at point E in the middle.

[0039] In the figure,

[0040] 10-box; 11-cover; 12-drying assembly; 13-heating device; 14-dust collection device; 15-dust collection duct; 16-dust collection joint; 17-conveying roller; 18-air outlet channel; 19-drying chamber; 20-partition; 21-second chamber; 22-first chamber; 23-screw; 24-limiting groove; 25-limiting part; 26-filter element; 27-vibration motor; 28-electromagnet; 29-vibration plate; 30-support frame; 31-slide seat; 32-positioning rod; 33-brush; 34-connecting rod; 35-positioning wheel; 36-transport port; 37-protective cover; 38-guide part; 39-blocking part; 40-positioning hole; 41-suction part; 42-collection box; 43-plug; 44-suction section; 45-collection section; 46-discharge section; 47-guide surface. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0044] like Figures 1 to 12 As shown, the manufacturing method of the sunshade net of the present invention mainly ensures the quality and performance of the product through a series of orderly and fine processing steps. The implementation of the steps has a significant effect on improving the sunshade effect, durability and anti-aging performance of the sunshade net.

[0045] The manufacturing method of the sunshade net of the present invention has the following specific operating steps: firstly, the raw materials (such as thermoplastic materials such as polypropylene and polyethylene) for manufacturing the sunshade net are heated and melted by the existing heating equipment 13 to make them reach a plastic state, and then they are extruded and cooled by a mold to form a plastic film (formed after the raw materials are melted), and the plastic film is passed through the medium in the box body 10 through the transportation component to be cooled and shaped. The box body 10 is provided with a partition 20, and the partition 20 divides the box body 10 into a first cavity 22 and a second cavity 21. A cooling medium is placed in the first cavity 22. When the raw materials are melted, they are extruded into the medium through the existing equipment to be cooled and shaped. To form a plastic film, the transport component adopts the structure in the prior art. The transport component will not conflict with other components. The transport component includes a conveying roller group arranged inside the box body 10. A transmission wheel is provided on the conveying roller 17. Two transmission wheels are provided on the conveying roller 17. A transmission chain cooperating therewith is provided on the transmission wheel. Two adjacent transmission rollers are connected by a transmission chain. The transmission wheel on the edge of the transmission roller at one end cooperates with the motor. The rotation of the motor drives the transmission roller to rotate. The transmission wheel cooperates with the transmission chain to realize the rotation of the transmission roller group, thereby realizing the transmission of the material. The plastic film (material) is transported to the subsequent process through the conveying component.

[0046] A positioning mechanism is provided on both sides of the box body 10, and the positioning mechanism is located in the first cavity 22. The positioning mechanism includes a support frame 30, a slide seat 31 is installed on the support frame 30, and a slider is provided on the slide seat 31. The slider moves along the slide seat 31, and the slide seat 31 adopts an electric control slide table, which is controlled by a control system. The slider is connected to a positioning rod 32, and a positioning wheel 35 is detachably connected to the positioning rod 32. When the equipment starts working, the controller controls the movement of the slider and adjusts the position of the adjusting wheel according to the actual situation until the positioning wheel 35 contacts the surface of the plastic film and maintains a resisting force to prevent the plastic film from being displaced during the movement. At the same time, since a roller is provided, when the plastic film moves through the transport component, the plastic film moves, and the rotation of the roller will not conflict with the conveying component to cause damage to the plastic film. The setting of the positioning wheel 35 has a limiting effect on the plastic film, so that the plastic film will not float up during the vacuuming process. In order to improve the drying efficiency of the plastic film, a connecting rod 34 is connected between the two positioning rods 32, and a brush 33 is installed on the connecting rod 34. The brush 33 is provided with a mounting hole, and the connecting rod 34 is provided with a matching hole. The screw 23 passes through the mounting hole and is screwed into the connecting hole to realize the disassembly and assembly connection of the brush 33 and the connecting rod 34. When the adjusting wheel contacts the surface of the plastic film, the hair on the brush 33 contacts the surface of the plastic film, and the transportation component drives the plastic film to move. The brush 33 evenly spreads the medium on the plastic film, so that the hot air is evenly in contact with the medium on the plastic film, which is convenient for the subsequent drying component 12 to dry the plastic film more conveniently and efficiently, thereby improving the drying efficiency.

[0047] The dust collection device 14 is arranged on one side of the positioning mechanism and is located above the first cavity 22. The dust collection device 14 includes a dust collection pipe 15 arranged above the box body 10, and a dust collection joint 16 connected to the dust collection pipe 15. The dust collection joint 16 is detachably connected to the dust collection pipe 15 for easy maintenance and replacement. The suction unit connected to the dust collection pipe 15 adopts a common device in the prior art. The suction unit is controlled by a controller. The control unit controls the suction unit to generate suction, and the motor drives the fan to rotate to generate a negative pressure effect, thereby achieving the effect of sucking impurities. Impurities on the surface of the plastic film are sucked into the dust collection pipe 15 through the dust collection joint 16, and the collected impurities are centrally processed. Impurities on the surface of the plastic film and the surface of the medium and Dust in the air is extracted, and the dust suction duct 15 includes a suction section 44, a collection section 45 and a discharge section 46 connected in sequence. The filter 26 is arranged between the collection section 45 and the discharge section 46. The filter 26 is arranged in an arc shape. The filter 26 includes a guide section and a blocking section. The blocking section is formed by bending one end of the guide section. The setting of the filter 26 can filter impurities. The blocking portion 39 is arranged in an arc shape. When impurities or water droplets pass through the filter 26, the impurities cannot enter the discharge section 46. Due to the effect of gravity, the impurities fall along the guide section 38. When passing through the blocking portion 39, the impurities fall along the blocking portion 39 into the integrated tank for collection and centralized treatment. Due to the arc shape of the blocking portion 39, the impurities will not enter the discharge section 46 from the collection section 45.

[0048] To facilitate the disassembly and assembly of the filter element 26, a limiting groove 24 is provided in the dust suction pipe 15, and a limiting portion 25 is provided on the filter element 26. When installing, the limiting portion 25 is aligned with the limiting groove 24 and clamped and pushed until the filter element 26 is clamped to the specified position. A positioning hole 40 is provided on the discharge section 46, and a matching hole is provided on the filter element 26. When the filter element 26 is installed, the screw 23 passes through the positioning hole 40 and is screwed into the matching hole to achieve the fixed installation of the filter element 26 to prevent the fixing part from falling off. A handle can be installed on the filter element 26 for easy pulling. At the same time, a seal or a plug is detachably connected to the outside of the dust suction pipe 15. When the filter element 26 is installed, the notch on one side of the dust suction pipe 15 for installing the filter element 26 is blocked by the seal to improve the dust suction effect.

[0049] A collecting box 42 connected to the dust suction channel is provided above the first cavity 22, and a guide surface 47 is provided obliquely in the collecting box 42. When solid impurities are cleaned through the filter element 26, the impurities fall into the collecting box 42 along the guide surface 47 due to the inclined setting of the guide surface 47. A discharge port is provided at the bottom of the collecting box 42, and the discharge port is communicated with the interior of the collecting box 42. A plug 43 is provided on the discharge port. When impurities need to be cleaned, the impurities can be centrally processed by opening the plug 43.

[0050] A drying assembly 12 (not specifically shown in the figure) is provided on one side of the positioning mechanism. The components of the drying assembly 12 are integrated on one side of the box body 10. A cover body 11 is provided on the box body 10. A drying chamber 19 is formed between the cover body 11 and the box body 10. Transport ports 36 for transporting plastic film are provided at both ends of the cover body 11. The drying assembly 12 includes a burner, a hot air furnace, a hot air duct connected to the hot air furnace, and a fan connected to the hot air duct. The burner, the hot air furnace and the fan all use common components in the prior art. The fuel is converted into The heat energy is converted into heat energy, and the fuel can be (such as coal, gas, etc.). The hot air furnace uses air as the medium to transfer the heat energy generated by the combustion of the fuel to the heated object. A fan is set to make the hot air transportation effect better. After the fan is started, it will continuously transport the hot air generated by the hot air furnace to the drying chamber 19 through the hot air duct. With the continuous circulation and heating of the hot air, the moisture on the plastic film is gradually evaporated, thereby achieving a drying effect. The conveying roller group is regularly arranged in the second chamber, so that both sides of the plastic film can be evenly heated, thereby improving the drying effect.

[0051] An air outlet channel 18 is provided at the upper end of the cover plate, and a filtering structure is provided in the air outlet channel 18. The filtering structure adopts a structure commonly used in the prior art. When the hot air dries the surface of the plastic film, the hot air containing impurities and moisture moves upward into the air outlet channel 18, is filtered by the filtering structure and discharged out of the cavity, and the filtered impurities are centrally processed.

[0052] In order to improve the drying effect, heating fans are installed on both inner sides of the second cavity 21, and a fan is installed at the output end of the heating fan. The fan outer cover is provided with a protective cover 37, and ventilation holes are evenly distributed on the protective cover 37. The number and shape of the ventilation holes are set according to actual needs. The two fans are on the same axial line and rotate counterclockwise. The rotation of the two fans drives the airflow in the second cavity 21 to stir, thereby improving the drying effect of the items in the second cavity 21, reducing energy consumption, and improving drying efficiency.

[0053] A vibration component is provided in the dust collection pipe 15, a protection plate is provided in the dust collection pipe 15, the protection plate is connected to the dust collection pipe 15 by screws 23, the vibration component is installed in the protection plate, the vibration component is arranged in the discharge section 46, the vibration component includes a vibration motor 27 connected to the dust collection pipe 15, a vibration plate 29 connected to the vibration motor 27, and an electromagnet 28 connected to the vibration plate 29, the vibration motor 27 is controlled by a control system, the control system adopts a plc control system, the control system controls the operation of pneumatic components and electrical components, a suction part 41 is provided on the filter 26, and the suction part 41 has magnetism, When the filter element 26 is installed, the control system controls the electromagnet 28 to be energized to generate magnetism and engage with the suction part 41 to achieve the connection between the two. The vibration motor 27 drives the filter element 26 (which has a certain deformation ability) to vibrate (micro vibration) to shake off the impurities remaining on the surface of the filter element 26. When the filter element 26 needs to be replaced, the control system disconnects the power of the electromagnet 28, the electromagnet 28 loses its magnetic attraction, and the electromagnet 28 is disconnected from the suction part 41. The screw 23 is unscrewed to disengage the filter element 26 from the dust collection pipe 15, and the filter element 26 is moved out along the limiting groove 24 for replacement.

[0054] A vibration assembly is provided in the drying chamber 19, and the vibration assembly includes a vibration motor 27, a vibration plate 29 connected to the vibration motor 27, and a vibration rod connected to the vibration plate 29. The vibration rod contacts the surface of the plastic film, and the vibration of the vibration motor 27 drives the vibration rod to move. The vibration of the vibration rod drives the surface vibration of the plastic film to shake off impurities. The vibration rod drives the entire device to vibrate, and the impurities on the filter element 26 are driven to fall off through vibration.

[0055] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A method for manufacturing a sunshade net, characterized in that: The following steps are included The raw materials are melted by a heating device to form a plastic film; The plastic mold is transported into the box by a conveying assembly for cooling; Setting a positioning mechanism to position the plastic film; A dust collecting device is provided to process the surface of the plastic mold; Setting a drying component to dry the plastic mold; The raw material is made into a plastic film by the heating device, the plastic film is transported by the conveying component, the positioning component cooperates with the dust collection device to perform dust collection on the plastic film, and finally the plastic film is dried by the drying component.

2. The method for manufacturing a sunshade net according to claim 1, characterized in that: The vacuum device comprises a suction unit, a vacuum pipe, a vacuum joint connected to the vacuum pipe, a filter assembly arranged in the vacuum pipe, and a control system. The control system controls the suction unit to process the plastic film.

3. The method for manufacturing a sunshade net according to claim 2, characterized in that: A vibration assembly is provided in the dust collection duct, and the vibration assembly includes a vibration motor connected to the dust collection duct, a vibration plate connected to the vibration motor, and an electromagnet connected to the vibration plate. A suction part is provided on the filter element, and the electromagnet cooperates with the suction part to achieve connection between the two.

4. The method for manufacturing a sunshade net according to claim 2, characterized in that: The dust suction pipe is provided with a limiting groove, the filter assembly comprises a filter element, the filter element is provided with a limiting portion, and the limiting portion moves along the limiting groove.

5. The method for manufacturing a sunshade net according to claim 3, characterized in that: The filter element comprises a guide section, which is arranged in an arc shape. One end of the guide section is bent to form a blocking section, and impurities are centrally processed through the guide section and the blocking section.

6. The method for manufacturing a sunshade net according to claim 1, characterized in that: The positioning mechanism includes support frames arranged on both sides of the box body, a slide seat connected to the support frames, a moving block arranged on the slide seat, a positioning rod connected to the moving block, and a positioning wheel connected to the positioning rod. The position of the positioning wheel is adjusted by moving the moving block along the slide seat.

7. The method for manufacturing a sunshade net according to claim 1, characterized in that: The transport assembly includes a conveying roller group arranged in the box body, a transmission wheel matched with the conveying roller group, a transmission chain matched with the transmission wheel, and a motor matched with the transmission chain, and the conveying roller group is driven to rotate by the rotation of the motor.

8. The method for manufacturing a sunshade net according to claim 1, characterized in that: The box body is covered with a cover body, and a drying chamber is formed between the cover body and the box body. The drying component includes a burner, a hot air stove, a fan and a hot air duct. The burner is connected to the hot air stove, the hot air duct is connected to the hot air stove, and the fan is connected to the hot air duct. The burner and the hot air stove cooperate to generate high-temperature gas to dry the plastic film.

9. The method for manufacturing a sunshade net according to claim 8, characterized in that: An air outlet channel is provided on the cover body, the air outlet channel is communicated with the drying chamber, and a filtering structure is provided in the air outlet channel.

10. The method for manufacturing a sunshade net according to claim 1, characterized in that: A heating fan is provided on the side of the box body, and a fan is connected to the rotating shaft of the heating fan. At least two fans are provided, and the two fans rotate in the same direction. The stirring of the air in the drying chamber is achieved through the same-direction rotation of the fans.

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