Vacuum conveying equipment for powder particles

Abstract

The utility model provides powder particle vacuum conveying equipment, and belongs to the technical field of powder particle conveying. The powder vacuum conveying equipment comprises a main body and a protection mechanism, the main body comprises a bottom plate, one side of the upper end of the bottom plate is connected with a telescopic rod, one side of the output end of the telescopic rod is connected with a connecting ring, a discharging barrel is inserted into the connecting ring, the outer portion of the bottom end of the discharging barrel is sleeved with a discharging metering valve, and one side of the discharging barrel is connected with a first connecting pipe; the protection mechanism comprises a vacuum cylinder, the bottom end of the vacuum cylinder is connected with the upper end of the discharging cylinder, a vacuum pump is inserted into the upper end of the vacuum cylinder, a circular ring is connected into the vacuum cylinder, a roller path is formed in the inner wall of the circular ring, a filter plate is embedded into the circular ring, a plurality of clamping grooves are formed in the outer wall of the filter plate, and balls are arranged in the clamping grooves. And one side of the outer wall of the ball is attached to the inner wall of the roller path, and the upper end of the filter plate is connected with a rotating rod.

Description

Technical Field

[0001] The utility model relates to the technical field of powder and granule conveying, in particular to a powder and granule vacuum conveying device. Background Art

[0002] Powder is a general term for solid powder materials, which is a collection of particles. According to the size of the particles, powder can be divided into coarse particles and powder. For example, rice, wheat, corn, etc. are coarse particles, while flour and milk powder are powder. These particulate materials are widely used in industry, agriculture, food processing and other fields. Vacuum conveying equipment is a dust-free closed pipeline conveying equipment that uses vacuum suction to convey particles and powder materials. This conveying method can eliminate dust pollution, improve the working environment, reduce the pollution of the environment and personnel to the materials, and improve the cleanliness.

[0003] For example, a Chinese patent with publication number CN220316577U discloses a negative pressure conveying device for silica powder, including a bottom plate, a support frame fixedly connected to the upper surface of the bottom plate, a vacuum tank fixedly connected to the outer surface of the support frame, a cleaning mechanism provided on the inner wall of the vacuum tank, and a discharge port fixedly connected to the bottom surface of the vacuum tank. This embodiment can clean the inner wall of the vacuum tank and scrape off the smaller particles on the vacuum tank by setting the cleaning mechanism. There is no need to manually clean the inner wall of the vacuum tank, thus avoiding manual cleaning that reduces the cleaning efficiency, thereby reducing the cleaning intensity of the staff, and mechanical methods can be used to improve the cleaning efficiency, thereby improving the practicality of the negative pressure conveying device for silica powder. The overall structure is simple, the design is reasonable, and the stability is good. When in use, not only the vacuum tank can be cleaned, but also the filter plate can be quickly disassembled. The operation is simple and better meets people's use needs.

[0004] In actual use of the technical solution recorded in this proposal, the vacuum pump is directly connected to the vacuum tube through the first connecting tube, and there is a lack of filtering protection for the vacuum pump. Under long-term transportation and use, tiny particles in the split three-dimensional material can easily enter the vacuum pump and cause blockage, thereby affecting the normal operation of the vacuum pump. Utility Model Content

[0005] In order to solve the above technical problems, the embodiment of the utility model provides a vacuum conveying device for powder and granules, which is specifically implemented by the following technical solutions:

[0006] A powder and granular material vacuum conveying device, comprising a main body and a protection mechanism. The main body includes a bottom plate, one side of the upper end of the bottom plate is connected with a telescopic rod, one side of the output end of the telescopic rod is connected with a connecting ring, a feeding cylinder is inserted into the inside of the connecting ring, a discharging metering valve is sleeved outside the bottom end of the feeding cylinder, and a first connecting pipe is connected to one side of the feeding cylinder. The protection mechanism includes a vacuum cylinder, the bottom end of the vacuum cylinder is connected to the upper end of the feeding cylinder, a vacuum pump is inserted into the upper end of the vacuum cylinder, a circular ring is connected inside the vacuum cylinder, a raceway is opened on the inner wall of the circular ring, a filter plate is embedded inside the circular ring, a plurality of engaging grooves are opened on the outer wall of the filter plate, a ball is arranged in each of the plurality of engaging grooves, and one side of the outer wall of the ball is attached to the inner wall of the raceway. A rotating rod is connected to the upper end of the filter plate.

[0007] Further, a connecting box is inserted into one side inside the vacuum cylinder, a rotating shaft is rotatably connected inside the connecting box, synchronous wheels are sleeved outside both the rotating shaft and the rotating rod, and a synchronous belt is wound between a pair of the synchronous wheels.

[0008] The beneficial effect of adopting the above further scheme is that by sleeving synchronous wheels outside the rotating shaft and the rotating rod, and winding a synchronous belt between a pair of the synchronous wheels, when the rotating shaft rotates, the synchronous wheel outside it will rotate, and thus the rotation of the other synchronous wheel and the rotating rod is realized under the action of the synchronous belt.

[0009] Further, a motor is connected to the upper end of the connecting box, and the output end of the motor is in transmission connection with the rotating shaft through a coupling.

[0010] The beneficial effect of adopting the above further scheme is that by arranging the motor, when the motor works, it is convenient to realize the rotation of the rotating shaft.

[0011] Further, a bracket is connected to one side of the inner wall of the vacuum cylinder, an air pipe is inserted into the inside of the bracket, and an air outlet groove is opened at the bottom end of the air pipe.

[0012] The beneficial effect of adopting the above further scheme is that by arranging the bracket, it is convenient to install the air pipe. The air pipe is arranged above the filter plate, and by arranging the air outlet groove at the bottom end of the air pipe, it is convenient for the air to blow back the filter plate through the air outlet groove.

[0013] Further, a connecting seat is connected to one side of the outer wall of the vacuum cylinder, a fan is connected to one end of the connecting seat, an air outlet of the fan is connected with a second connecting pipe, and one end of the second connecting pipe penetrates through the vacuum cylinder and extends to the inside, and is connected with the air pipe.

[0014] The beneficial effects of adopting the above further solution are as follows. By setting up the connecting seat, it is convenient to install the fan. Since the air outlet of the fan is connected to the second connecting pipe, when the fan is working, it is convenient for the air to enter the inside of the air duct from the outside through the fan and the second connecting pipe.

[0015] Further, a card slot is opened on the upper end of the bottom plate on the side away from the telescopic rod. A magnet block is arranged inside the card slot. The upper end of the magnet block is connected with a storage cylinder. A cylinder cover is arranged on the upper end of the storage cylinder. The upper end of the cylinder cover is connected with one end of the first connecting pipe.

[0016] The beneficial effects of adopting the above further solution are as follows. By arranging the magnet block at the bottom end of the storage cylinder, it is convenient to push the magnet block to one side inside the card slot. By setting up the cylinder cover, the cylinder cover and the storage cylinder are connected by bolts. When the cylinder cover is removed, it is convenient to pour the powder or granular material into the storage cylinder. A round hole is opened at the center of the cylinder cover. One end of the first connecting pipe extends into the storage cylinder through the round hole.

[0017] Further, an electromagnet is embedded at the bottom end of the card slot. The electromagnet and the magnet block attract each other magnetically.

[0018] The beneficial effects of adopting the above further solution are as follows. By setting up the electromagnet and the electromagnet attracting the magnet block, when the electromagnet is powered on, it is convenient to adsorb the magnet block, so that the magnet block is fixed inside the card slot, and further the connection between the bottom plate and the storage cylinder is realized.

[0019] Further, anti-static coatings are provided on the inner walls of the feeding cylinder, the first connecting pipe and the vacuum cylinder.

[0020] The beneficial effects of adopting the above further solution are as follows. By providing anti-static coatings on the inner walls of the feeding cylinder, the first connecting pipe and the vacuum cylinder, during the conveying process of the powder or granular material, due to the friction and flow of the powder or granular material, static electricity is easily generated, which may cause the powder or granular material to adhere to the inner walls of the feeding cylinder, the first connecting pipe and the vacuum cylinder, thus affecting the conveying. The anti-static coatings can effectively prevent the accumulation of static electricity.

[0021] The beneficial effects of the present utility model are as follows: A powder and granular vacuum conveying device obtained by the above design in the present utility model. In this powder and granular vacuum conveying device, by providing a first connecting pipe, one end of the first connecting pipe extends into the interior of the storage cylinder, and the outer wall of the first connecting pipe is slidably connected to the inner wall of the circular hole of the cylinder cover. By connecting the bottom end of the vacuum cylinder and the upper end of the feeding cylinder, and inserting a vacuum pump at the upper end of the vacuum cylinder, the air inlet of the vacuum pump is inside the vacuum cylinder. When the vacuum pump operates, it is convenient to make the interior of the vacuum cylinder and the feeding cylinder in a negative pressure state, and the powder and granular materials are sent into the interior of the feeding cylinder through the first connecting pipe. By providing a filter plate, it is convenient to protect the vacuum pump during operation, preventing the powder and granular materials from entering the interior of the vacuum pump and causing the vacuum pump to be blocked. At this time, the powder and granular materials are adsorbed at the bottom end of the filter plate. By providing a rotating rod at the upper end of the filter plate, since the filter plate is embedded in the interior of the circular ring, and the ball bearings provided in the engaging grooves on the outer wall of the filter plate are in contact with the inner wall of the raceway of the circular ring, when the rotating rod rotates, it is convenient to realize the stable rotation of the filter plate, thereby facilitating the subsequent air outlet of the air duct to blow back the powder and granular materials at the bottom end of the filter plate comprehensively and completing the cleaning of the filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Schematic three-dimensional structure of a powder and granular vacuum conveying device provided by the present utility model Figure 1 ;

[0024] Figure 2 Schematic three-dimensional structure of a powder and granular vacuum conveying device provided by the present utility model Figure 2 ;

[0025] Figure 3 Exploded three-dimensional structure schematic diagram of the bottom plate and storage cylinder of a powder and granular vacuum conveying device provided by the present utility model;

[0026] Figure 4 Schematic three-dimensional structure inside the vacuum cylinder of a powder and granular vacuum conveying device provided by the present utility model;

[0027] Figure 5 Exploded three-dimensional structure schematic diagram of the circular ring and filter plate of a powder and granular vacuum conveying device provided by the present utility model;

[0028] Figure 6Schematic three-dimensional structure diagram of the air duct of a powder and granular vacuum conveying device provided by the present utility model.

[0029] In the figure: 100, main body; 1001, bottom plate; 1002, telescopic rod; 1003, connecting ring; 1004, blanking cylinder; 1005, discharge metering valve; 1006, first connecting pipe; 1007, clamping groove; 1008, electromagnet; 1009, magnet block; 1010, storage cylinder; 1011, cylinder cover; 200, protection mechanism; 2001, vacuum cylinder; 2002, vacuum pump; 2003, circular ring; 2004, filter plate; 2005, raceway; 2006, ball; 2007, rotating rod; 2008, connecting box; 2009, rotating shaft; 2010, synchronous pulley; 2011, synchronous belt; 2012, motor; 2013, connecting seat; 2014, bracket; 2015, air duct; 2016, fan; 2017, second connecting pipe. Detailed implementation manners

[0030] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0031] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0032] Embodiment 1

[0033] The present utility model provides the following technical solutions: As Figures 1 - 6As shown in the figure, a powder and granular material vacuum conveying device includes a main body 100 and a protection mechanism 200. The main body 100 includes a bottom plate 1001. One side of the upper end of the bottom plate 1001 is connected with a telescopic rod 1002. One side of the output end of the telescopic rod 1002 is connected with a connecting ring 1003. A feeding cylinder 1004 is inserted into the inside of the connecting ring 1003. An outlet metering valve 1005 is sleeved outside the bottom end of the feeding cylinder 1004. And one side of the feeding cylinder 1004 is connected with a first connecting pipe 1006. The protection mechanism 200 includes a vacuum cylinder 2001. The bottom end of the vacuum cylinder 2001 is connected with the upper end of the feeding cylinder 1004. And a vacuum pump 2002 is inserted into the upper end of the vacuum cylinder 2001. A circular ring 2003 is connected inside the vacuum cylinder 2001. A raceway 2005 is opened on the inner wall of the circular ring 2003. A filter plate 2004 is embedded inside the circular ring 2003. A plurality of clamping grooves are opened on the outer wall of the filter plate 2004. A ball 2006 is arranged inside each of the plurality of clamping grooves. One side of the outer wall of the ball 2006 is attached to the inner wall of the raceway 2005. A rotating rod 2007 is connected to the upper end of the filter plate 2004. By setting the telescopic rod 1002, according to the amount of materials in the storage cylinder 1010, the heights of the feeding cylinder 1004, the first connecting pipe 1006 and the vacuum cylinder 2001 are adjusted. By starting the vacuum pump 2002, it is convenient to make the inside of the vacuum cylinder 2001 and the feeding cylinder 1004 in a negative pressure state, and the powder and granular materials are sent into the inside of the feeding cylinder 1004 through the first connecting pipe 1006. By setting the filter plate 2004, it is convenient to protect the vacuum pump 2002 during operation, and prevent the powder and granular materials from entering the inside of the vacuum pump 2002, resulting in blockage of the vacuum pump 2002. At this time, the powder and granular materials are adsorbed on the bottom end of the filter plate 2004. Since the filter plate 2004 is embedded inside the circular ring 2003, and the balls 2006 arranged inside the clamping grooves on the outer wall of the filter plate 2004 are attached to the inner wall of the raceway 2005 of the circular ring 2003, when the rotating rod 2007 rotates, it is convenient to realize the stable rotation of the filter plate 2004. By setting the outlet metering valve 1005, the metered discharge amount is controlled to ensure the accuracy and efficiency of the discharge.

[0034] Embodiment 2

[0035] Refer to Figures 1 - 6As shown in the figure, a connection box 2008 is inserted inside one side of the vacuum cylinder 2001. A rotating shaft 2009 is rotatably connected inside the connection box 2008. Synchronous wheels 2010 are sleeved on the outer parts of the rotating shaft 2009 and the rotating rod 2007. A synchronous belt 2011 is wound between a pair of synchronous wheels 2010. The upper end of the connection box 2008 is connected with a motor 2012. The output end of the motor 2012 is in transmission connection with the rotating shaft 2009 through a coupling. One side of the inner wall of the vacuum cylinder 2001 is connected with a bracket 2014. An air duct 2015 is inserted inside the bracket 2014. An air outlet groove is opened at the bottom end of the air duct 2015. One side of the outer wall of the vacuum cylinder 2001 is connected with a connection seat 2013. One end of the connection seat 2013 is connected with a fan 2016. The air outlet of the fan 2016 is connected with a second connecting pipe 2017. One end of the second connecting pipe 2017 penetrates through the vacuum cylinder 2001 and extends to the inside, and is connected with the air duct 2015. By starting the motor 2012, it is convenient to realize the rotation of the rotating shaft 2009, and under the transmission action of the synchronous wheels 2010 and the synchronous belt 2011, the rotation of the rotating rod 2007 is realized. By starting the fan 2016, it is convenient for the air to enter the inside of the air duct 2015 from the outside through the fan 2016 and the second connecting pipe 2017, and blow back the granular material at the bottom end of the filter plate 2004 through the air outlet groove.

[0036] Embodiment Three

[0037] Refer to Figures 1 - 6 As shown in the figure, a clamping groove 1007 is opened on the upper end of the bottom plate 1001 on the side far from the telescopic rod 1002. A magnet block 1009 is arranged inside the clamping groove 1007. The upper end of the magnet block 1009 is connected with a storage cylinder 1010. A cylinder cover 1011 is arranged on the upper end of the storage cylinder 1010. The upper end of the cylinder cover 1011 is connected with one end of the first connecting pipe 1006. An electromagnet 1008 is embedded at the bottom end of the clamping groove 1007. The electromagnet 1008 and the magnet block 1009 are magnetically attracted to each other. Anti-static coatings are provided on the inner walls of the feeding cylinder 1004, the first connecting pipe 1006 and the vacuum cylinder 2001. By arranging the magnet block 1009 at the bottom end of the storage cylinder 1010, it is convenient to push the magnet block 1009 to one side inside the clamping groove 1007. Since the cylinder cover 1011 and the storage cylinder 1010 are connected by bolts, when the cylinder cover 1011 is removed, it is convenient to pour granular material into the storage cylinder 1010. By energizing the electromagnet 1008, the electromagnet 1008 adsorbs the magnet block 1009, so that the magnet block 1009 is fixed inside the clamping groove 1007, thereby realizing the connection between the bottom plate 1001 and the storage cylinder 1010. By arranging anti-static coatings on the inner walls of the feeding cylinder 1004, the first connecting pipe 1006 and the vacuum cylinder 2001, during the conveying process of the granular material, the accumulation of static electricity can be effectively prevented.

[0038] Specifically, the working principle of this powder and granular material vacuum conveying equipment is as follows: When in use, first remove the cylinder cover 1011, pour the powder and granular material into the inside of the storage cylinder 1010, push the magnet block 1009 to one side inside the card slot 1007, energize the electromagnet 1008, so that the electromagnet 1008 adsorbs the magnet block 1009, making the magnet block 1009 fixed inside the card slot 1007, thereby realizing the connection between the bottom plate 1001 and the storage cylinder 1010. By setting the telescopic rod 1002, according to the amount of material inside the storage cylinder 1010, adjust the heights of the feeding cylinder 1004, the first connecting pipe 1006 and the vacuum cylinder 2001, so that one end of the first connecting pipe 1006 is inserted into the powder and granular material inside the storage cylinder 1010. By starting the vacuum pump 2002, it is convenient to make the inside of the vacuum cylinder 2001 and the feeding cylinder 1004 in a negative pressure state, and send the powder and granular material into the inside of the feeding cylinder 1004 through the first connecting pipe 1006. By setting the filter plate 2004, it is convenient to protect the vacuum pump 2002 during operation, and prevent the powder and granular material from entering the inside of the vacuum pump 2002, resulting in blockage of the vacuum pump 2002. At this time, the powder and granular material is adsorbed at the bottom end of the filter plate 2004. By starting the blower 2016, it is convenient for the air to enter the inside of the air duct 2015 from the outside through the blower 2016 and the second connecting pipe 2017, and blow back the powder and granular material at the bottom end of the filter plate 2004 through the air outlet groove. At the same time, start the motor 2012, the rotation of the rotating shaft 2009, and realize the rotation of the rotating rod 2007 under the driving action of the synchronous pulley 2010 and the synchronous belt 2011. Since the filter plate 2004 is embedded inside the ring 2003, and the balls 2006 arranged inside the engaging groove on the outer wall of the filter plate 2004 are in contact with the inner wall of the raceway 2005 of the ring 2003, when the rotating rod 2007 rotates, it is convenient to realize the stable rotation of the filter plate 2004, and comprehensively blow back the powder and granular material at the bottom end of the filter plate 2004. By setting the discharge metering valve 1005, control the metered discharge amount to ensure the accuracy and efficiency of the discharge, complete the vacuum conveying of the powder and granular material, and at the same time, by setting an anti-static coating on the inner walls of the feeding cylinder 1004, the first connecting pipe 1006 and the vacuum cylinder 2001, during the powder and granular material conveying process, it can effectively prevent the accumulation of static electricity.

[0039] It should be noted that for a powder and granular material vacuum conveying equipment, the specific model specifications of the telescopic rod 1002, the discharge metering valve 1005, the electromagnet 1008, the vacuum pump 2002, the motor 2012 and the blower 2016 need to be selected and determined according to the actual specifications of the device, etc. The specific selection calculation method adopts the existing technology in this field, so it will not be elaborated in detail.

[0040] For a powder and granular vacuum conveying device, the power supply and its principle of the telescopic rod 1002, the discharge metering valve 1005, the electromagnet 1008, the vacuum pump 2002, the motor 2012 and the fan 2016 are clear to those skilled in the art and will not be described in detail herein.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A vacuum conveying device for powder and granules, characterized in that: The invention comprises a main body (100) and a protection mechanism (200), wherein the main body (100) comprises a bottom plate (1001), a telescopic rod (1002) is connected to one side of the upper end of the bottom plate (1001), a connecting ring (1003) is connected to one side of the output end of the telescopic rod (1002), a discharge barrel (1004) is inserted into the interior of the connecting ring (1003), a discharge metering valve (1005) is sleeved on the outside of the bottom end of the discharge barrel (1004), and a first connecting pipe (1006) is connected to one side of the discharge barrel (1004), and the protection mechanism (200) comprises a vacuum barrel (2001), the bottom end of the vacuum barrel (2001) is connected to the discharge metering valve (1005), and a first connecting pipe (1006) is connected to one side of the discharge metering valve (1005). The upper ends of the lower material cylinder (1004) are connected, and a vacuum pump (2002) is inserted into the upper end of the vacuum cylinder (2001), the interior of the vacuum cylinder (2001) is connected with a circular ring (2003), the inner wall of the circular ring (2003) is provided with a rolling track (2005), a filter plate (2004) is embedded in the interior of the circular ring (2003), a plurality of engaging grooves are provided on the outer wall of the filter plate (2004), and a ball (2006) is provided inside each of the engaging grooves, one side of the outer wall of the ball (2006) is in contact with the inner wall of the rolling track (2005), and the upper end of the filter plate (2004) is connected with a rotating rod (2007).

2. The vacuum conveying equipment for powder and granules according to claim 1, characterized in that: A connection box (2008) is inserted into one side of the vacuum cylinder (2001), and a rotating shaft (2009) is rotatably connected to the inside of the connection box (2008). Synchronous wheels (2010) are sleeved on the outside of the rotating shaft (2009) and the rotating rod (2007), and a synchronous belt (2011) is wound around a pair of the synchronous wheels (2010).

3. The vacuum conveying equipment for powder and granules according to claim 2, characterized in that: The upper end of the connection box (2008) is connected to a motor (2012), and the output end of the motor (2012) is transmission-connected to the rotating shaft (2009) via a coupling.

4. The vacuum conveying equipment for powder and granules according to claim 3, characterized in that: A bracket (2014) is connected to one side of the inner wall of the vacuum cylinder (2001), an air duct (2015) is inserted into the interior of the bracket (2014), and an air outlet slot is provided at the bottom end of the air duct (2015).

5. The vacuum conveying equipment for powder and granules according to claim 4, characterized in that: A connection seat (2013) is connected to one side of the outer wall of the vacuum cylinder (2001); one end of the connection seat (2013) is connected to a fan (2016); an air outlet of the fan (2016) is connected to a second connection pipe (2017); one end of the second connection pipe (2017) passes through the vacuum cylinder (2001) and extends to the interior, and is connected to the air duct (2015).

6. The vacuum conveying equipment for powder and granules according to claim 1, characterized in that: The upper end of the bottom plate (1001) is provided with a slot (1007) on a side away from the telescopic rod (1002), a magnet block (1009) is provided inside the slot (1007), the upper end of the magnet block (1009) is connected to a material storage barrel (1010), the upper end of the material storage barrel (1010) is provided with a barrel cover (1011), and the upper end of the barrel cover (1011) is connected to one end of the first connecting tube (1006).

7. The vacuum conveying equipment for powder and granules according to claim 6, characterized in that: An electromagnet (1008) is embedded at the bottom end of the slot (1007), and the electromagnet (1008) and the magnet block (1009) are magnetically attracted to each other.

8. The vacuum conveying equipment for powder and granules according to claim 7, characterized in that: The inner walls of the lower material cylinder (1004), the first connecting tube (1006) and the vacuum cylinder (2001) are all provided with an antistatic coating.

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