In the spray chamber oblique guide continuous plate spray machine

Abstract

The present application discloses a spraying machine for guiding a continuous plate in a spraying chamber, comprising a chamber, at least four centrifugal impellers, at least one internal support mechanism and at least one internal oblique guiding mechanism. The centrifugal impellers are respectively arranged on the two side walls of the chamber, and the centrifugal impellers can spray the sand particles along the sand discharge path to the surface of the plate. The internal support mechanism is arranged in the chamber, and one side of the plate can be placed on the internal support mechanism to guide the plate to move in the chamber. The internal oblique guiding mechanism is arranged in the chamber, and the other side of the plate can be placed on the internal oblique guiding mechanism, and the internal oblique guiding mechanism can be used to guide the plate to maintain a set inclination angle. Thus, the sand removal problem can be effectively solved, and a large number of sand removal devices do not need to be arranged, the equipment cost is reduced, and the energy consumption during operation is reduced.

Description

TECHNICAL FIELD

[0001] The present invention relates to a blasting machine for obliquely guiding a continuous plate in a blasting chamber, in particular to a blasting machine for obliquely guiding a plate in a blasting chamber after the plate is unwound from a continuous web. BACKGROUND

[0002] For surface treatment of metal workpieces, a blasting machine capable of combining the advantages of sand blasting and bead blasting is disclosed in Patent TW I709460 "Blasting machine and impeller device thereof". The impeller device of the blasting machine can blast blasting particles at high speed, and the particle size of the blasting particles can be between the sand of sand blasting and the steel balls of bead blasting. The blasting machine can not only provide cleaning effect and improve surface roughness, but also can further improve the fatigue strength of the workpiece and the hardness of the surface of the workpiece, thereby prolonging the service life.

[0003] However, when the blasting machine sprays blasting particles to hit the surface of the plate, the plate is conveyed in a horizontal state, and the blasting particles will continuously accumulate on the surface of the plate. The accumulated particles will block the downstream blasting, resulting in useless blasting treatment. Therefore, a sand removal device must be provided downstream of each blasting section, which results in high equipment cost and high energy consumption during operation. SUMMARY

[0004] The present invention solves the technical problem of the prior art by providing a blasting machine for obliquely guiding a continuous plate in a blasting chamber. The blasting machine can effectively solve the problem of sand removal, does not need to provide a large number of sand removal devices, reduces the equipment cost, and reduces the energy consumption during operation.

[0005] To solve the above technical problems, the present invention provides a blasting machine for obliquely guiding a continuous plate in a blasting chamber. The blasting machine is arranged on a conveying path, and a plate is conveyed along the conveying path. The blasting machine for obliquely guiding a continuous plate in a blasting chamber comprises: a chamber having two side walls located at opposite sides of the chamber; at least four centrifugal impellers arranged on the two side walls of the chamber, the four centrifugal impellers are arranged separately and located at two sides of the plate, and each of the four centrifugal impellers has a sand outlet path, and the four centrifugal impellers can blast blasting particles along the sand outlet path to hit the surface of the plate; at least one internal support mechanism arranged in the chamber, one side of the plate can be placed on the internal support mechanism to guide the plate to move in the chamber; and at least one internal oblique guide mechanism arranged in the chamber, the other side of the plate can be placed on the internal oblique guide mechanism, and the internal oblique guide mechanism can be used to guide the plate to maintain a set inclination angle.

[0006] Preferably, the four centrifugal impellers are arranged obliquely corresponding to the plate.

[0007] Preferably, the cavity contains a plurality of internal support mechanisms and a plurality of internal inclined guiding mechanisms, and the sand discharge path is disposed between two adjacent internal support mechanisms and between two adjacent internal inclined guiding mechanisms.

[0008] Preferably, at least one support plate is provided between each pair of adjacent second rollers of the internal inclined guide mechanism, the support plate being used to support the plate.

[0009] Preferably, the internal support mechanism includes a first roller, two first shafts, two first bearing seats, two first bearings, two first sealing rings, and two first conical sleeves. The two first shafts are respectively connected to both ends of the first roller and pass through the two side walls of the chamber. The two first bearings are respectively disposed on the two first bearing seats and the two first shafts are respectively mounted inside the two first bearings. The two first bearing seats are respectively mounted on the outer sides of the two side walls of the chamber, allowing the first roller to be rotatably disposed within the chamber. The two first sealing rings are respectively disposed between the two first bearing seats and the two side walls of the chamber. The two first shafts pass through the two first sealing rings. The two first conical sleeves are respectively fixed to the two side walls of the chamber and are respectively sleeved on the two first shafts, facing the inner side of the two side walls of the chamber. Each of the two first conical sleeves has a first through hole for the first shaft to pass through.

[0010] Preferably, an alloy protective tube is sleeved on the outer side of the first roller, and the outer edge of the alloy protective tube in contact with the plate forms a V-shaped groove, which can be used to position the plate.

[0011] Preferably, the two first cone sleeves are hollow cones, the diameter of the two first cone sleeves gradually increases in the direction away from the first roller, and the first cone sleeves are provided with a particle outlet hole facing the ground.

[0012] Preferably, the internal inclined guiding mechanism includes a second roller, two second shafts, two second bearing seats, two second bearings, two second sealing rings, and two second conical sleeves. The two second shafts are respectively connected to the two ends of the second roller. The two second bearings are respectively disposed on the two second bearing seats. The two second shafts are respectively mounted inside the two second bearings. The two second bearing seats are mounted on the inner side of the side wall of the chamber, so that the second roller is inclined and rotatably disposed in the chamber. The two second sealing rings are respectively disposed on the two second bearing seats. The two second shafts pass through the two second sealing rings. The two second conical sleeves are respectively sleeved on the two second shafts and face the second bearing seats. Each of the two second conical sleeves has a second through hole for the second shaft to pass through.

[0013] Preferably, the two second cone sleeves are hollow cones, and the diameter of the two second cone sleeves gradually increases in the direction away from the second roller.

[0014] The beneficial effects of this invention are as follows: The blasting machine provided by this invention, which obliquely guides a continuous sheet material within a blasting chamber, includes a chamber, at least four centrifugal impellers, at least one internal support mechanism, and at least one internal oblique guiding mechanism. The centrifugal impellers are respectively disposed on the two side walls of the chamber, and these impellers can propel the blasting particles along the sand discharge path to the surface of the sheet material. The internal support mechanism is disposed within the chamber, and one side of the sheet material can be placed on the internal support mechanism to guide the sheet material's movement within the chamber. The internal oblique guiding mechanism is disposed within the chamber, and the other side of the sheet material can rest against the internal oblique guiding mechanism, which guides the sheet material to maintain a set tilt angle. Therefore, this invention can transport the sheet material at an angle. When the blasting machine is blasting the surface of the sheet material, the blasting particles will naturally flow out of the inclined sheet material surface, preventing the blasting particles from accumulating on the surface and avoiding the problem of subsequent particles failing to hit the sheet material surface. Therefore, it eliminates the need for numerous sand removal devices, reducing equipment costs and energy consumption during operation.

[0015] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of the spraying machine platform that obliquely guides the continuous sheet material in the spraying chamber according to the present invention.

[0017] Figure 2 This is a top view schematic diagram of the spraying machine platform that obliquely guides a continuous sheet material within the spraying chamber according to the present invention.

[0018] Figure 3 This is a side cross-sectional view of the spraying machine platform that obliquely guides a continuous sheet material within the spraying chamber according to the present invention.

[0019] Figure 4 for Figure 3 Detailed diagram of Part IV.

[0020] Figure 5 for Figure 3 Detailed drawing of Part V.

[0021] Figure 6 This is a three-dimensional schematic diagram of the spraying machine platform that obliquely guides a continuous sheet material within the spraying chamber according to the present invention.

[0022] Figure 7 This is another perspective view of the spraying machine platform that obliquely guides the continuous sheet material in the spraying chamber according to the present invention.

[0023] Component designation explanation:

[0024] 1: Chamber

[0025] 11: Sidewall

[0026] 2: Centrifugal impeller

[0027] 21: Sand discharge path

[0028] 3: Internal support structure

[0029] 31: First roller

[0030] 32: First Axis

[0031] 33: First bearing housing

[0032] 34: First Bearing

[0033] 35: First sealing ring

[0034] 36: First conical sleeve

[0035] 361: First perforation

[0036] 362: Particle outlet

[0037] 37: Alloy protective tube

[0038] 4: Internal oblique guidance mechanism

[0039] 41: Second roller

[0040] 42: Second Axis

[0041] 43: Second bearing housing

[0042] 44: Second bearing

[0043] 45: Second sealing ring

[0044] 46: Second cone sleeve

[0045] 461: Second perforation

[0046] 5: Support plate

[0047] A: Conveying path

[0048] 100: Board material Detailed Implementation

[0049] The following specific embodiments illustrate the relevant implementation methods disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. Furthermore, the accompanying drawings of this invention are for simple illustrative purposes only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention. In addition, the term "or" as used herein may include, depending on the actual situation, any combination of any one or more of the associated listed items.

[0050] [Example]

[0051] Please see Figures 1 to 3 This invention provides a spraying machine for obliquely guiding a continuous sheet material within a spraying chamber. The machine is positioned on a conveying path A along which a sheet material 100 is conveyed. The sheet material 100 is a continuous sheet material. The spraying machine can continuously spray the sheet material 100, providing not only a cleaning effect and improving surface roughness, but also enhancing the fatigue strength and surface hardness of the sheet material 100, thereby increasing its service life. The spraying machine includes a chamber 1, at least four centrifugal impellers 2, at least one internal support mechanism 3, and at least one internal oblique guiding mechanism 4.

[0052] The chamber 1 has two side walls 11 located on opposite sides of the chamber 1. Four centrifugal impellers 2 can be respectively disposed on the two side walls 11 of the chamber 1. Each side wall 11 of the chamber 1 has at least two centrifugal impellers 2, and the centrifugal impellers 2 can be inclined to correspond to the plate 100. The four centrifugal impellers 2 are spaced apart and are located on both sides of the plate 100. In this embodiment, each side wall 11 of the plate 100 has four centrifugal impellers 2, that is, each spraying machine has a total of eight centrifugal impellers 2, which are respectively disposed on both sides of the plate 100. However, the number of centrifugal impellers 2 is not limited and can be increased or decreased as needed.

[0053] Each centrifugal impeller 2 has a sand discharge path 21. The centrifugal impeller 2 can spray the impact particles along the sand discharge path 21 onto the surface of the plate 100. These centrifugal impellers 2 are arranged on both sides of the plate 100 to symmetrically spray the upper and lower surfaces of the plate 100, so as to counteract the upper and lower stresses caused by the spraying, keep the plate 100 flat, and avoid local unevenness caused by different surface tensions. The impact particles in this embodiment can be, for example, ceramic sand, glass beads, nylon sand, quartz sand, corundum, iron sand, metal fine balls, etc., and are not limited thereto.

[0054] The internal support mechanism 3 is disposed within the chamber 1, and one side (the shorter side of the cross-section) of the continuous plate 100 can be placed on the internal support mechanism 3 to guide the plate 100 to move smoothly within the chamber 1. In this embodiment, there are multiple internal support mechanisms 3 inside the chamber 1.

[0055] Please see Figures 4 to 6 Each internal support mechanism 3 may include a first roller 31, two first shafts 32, two first bearing seats 33, two first bearings 34, two first sealing rings 35, and two first tapered sleeves 36.

[0056] Two first shafts 32 can be arranged horizontally, and the two first shafts 32 are respectively connected to the two ends of the first roller 31. The two first shafts 32 and the first roller 31 are coaxially arranged, and the two first shafts 32 respectively penetrate the two side walls 11 of the chamber 1. Two first bearings 34 are respectively disposed on two first bearing seats 33, and the two first shafts 32 are respectively mounted in the two first bearings 34. The two first bearing seats 33 are respectively mounted on the outside of the two side walls 11 of the chamber 1, so that the two first shafts 32 and the first roller 31 can be supported by the two first bearing seats 33 and the two first bearings 34, so that the first roller 31 can be rotatably disposed in the chamber 1. An alloy protective tube 37 can be further sleeved on the outside of the first roller 31. The alloy protective tube 37 can be used to protect the first roller 31 from being hit by the sprayed particles and is a replaceable consumable.

[0057] The two first sealing rings 35 can be circular rings. The two first sealing rings 35 are respectively disposed between the two first bearing seats 33 and the two side walls 11 of the chamber 1. The two first sealing rings 35 are tightly fitted against the two side walls 11 of the chamber 1. The two first shafts 32 pass through the two first sealing rings 35 respectively, so that the two first sealing rings 35 are respectively fitted onto the two first shafts 32. The first sealing rings 35 are located between the first roller 31 and the first bearing 34. The first sealing rings 35 can be used to prevent the impact and crushing dust from entering the interior of the first bearing 34 and causing wear.

[0058] The two first conical sleeves 36 can be made of alloy material and can be hollow cones. The diameter of the two first conical sleeves 36 gradually increases in the direction away from the first roller 31. The larger diameter ends of the two first conical sleeves 36 are respectively fixed to the two side walls 11 of the chamber 1. The two first conical sleeves 36 are respectively sleeved on the two first shafts 32 and face the inner side of the two side walls 11 of the chamber 1. Each of the two first conical sleeves 36 has a first through hole 361 (e.g., ...). Figure 4As shown), the first shaft 32 can pass through it. The first conical sleeve 36 is fixed on the side wall 11 of the chamber 1 and does not rotate with the first roller 31. It is used to protect the first sealing ring 35 from being hit by the sprayed particles and is a replaceable consumable. The first conical sleeve 36 may be provided with a particle outlet hole 362 facing the ground. The particle outlet hole 362 is used to allow the sprayed particles that have penetrated into the first conical sleeve 36 to flow out to prevent wear.

[0059] The first roller 31 of the internal support mechanism 3 is rotatably disposed within the chamber 1. Preferably, multiple internal support mechanisms 3 are provided, arranged along the conveying path A of the inclined continuous plate 100. One side (bottom side) of the plate 100 is placed on these internal support mechanisms 3, which guides the plate 100 to move smoothly forward. Preferably, the outer edge of the alloy protective tube 37 that contacts the plate 100 forms a V-shaped groove, which allows the plate 100 to be stably positioned.

[0060] The chamber 1 is also equipped with an internal inclined guiding mechanism 4. The other side (long side of the cross-section) of the continuous plate 100 can rest on the internal inclined guiding mechanism 4, which guides the plate 100 to move smoothly and maintains a set tilt angle, allowing the plate 100 to be conveyed at an angle. The plate 100 forms an angle with the horizontal plane, which can be between 5 degrees and 85 degrees. The angle can be 5 degrees, 15 degrees, 25 degrees, 35 degrees, 45 degrees, 55 degrees, 65 degrees, 75 degrees, or 85 degrees, etc. The tilt angle of the plate 100 is not limited. In this embodiment, there are multiple internal inclined guiding mechanisms 4 inside the chamber 1. Each sand discharge path 21 is set between two adjacent internal support mechanisms 3, and each sand discharge path 21 is set between two adjacent internal inclined guiding mechanisms 4 to prevent the sprayed particles of the sand discharge path 21 from directly hitting the internal support mechanism 3 and the internal inclined guiding mechanism 4 during spraying.

[0061] Please see Figure 3 and Figure 5 Each internal inclined guide mechanism 4 may include a second roller 41, two second shafts 42, two second bearing seats 43, two second bearings 44, two second sealing rings 45, and two second cone sleeves 46.

[0062] Two second shafts 42 are respectively connected to the two ends of the second roller 41. The two second shafts 42 and the second roller 41 are coaxially arranged. The two second bearing seats 43 are located at different horizontal heights. The two second bearings 44 are respectively arranged on the two second bearing seats 43. The two second shafts 42 are respectively mounted inside the two second bearings 44. The two second bearing seats 43 are mounted on the inner side of the side wall 11 of the chamber 1, so that the two second shafts 42 and the second roller 41 can be supported by the two second bearing seats 43 and the two second bearings 44, so that the second roller 41 is inclined and rotatably arranged in the chamber 1.

[0063] The two second sealing rings 45 can be circular rings, and are respectively disposed on the two second bearing seats 43. The two second shafts 42 pass through the two second sealing rings 45 respectively, so that the two second sealing rings 45 are respectively fitted on the two second shafts 42. The second sealing rings 45 are located between the second roller 41 and the second bearing 44. The second sealing rings 45 can be used to prevent the impact and crushing dust from entering the interior of the second bearing 44 and causing wear.

[0064] The two second tapered sleeves 46 can be made of alloy material and can be hollow cones. The diameter of the two second tapered sleeves 46 gradually increases in the direction away from the second roller 41. The larger diameter ends of the two second tapered sleeves 46 are respectively fixed to the two second bearing seats 43. The two second tapered sleeves 46 are respectively fitted onto the two second shafts 42 and face the second bearing seats 43. Each of the two second tapered sleeves 46 has a second through hole 461 (e.g., ...). Figure 5 As shown), the second shaft 42 can pass through, and the second tapered sleeve 46 is fixed on the second bearing seat 43 and does not rotate with the second roller 41. It is used to protect the second sealing ring 45 from being hit by the sprayed particles and is a replaceable consumable.

[0065] The second roller 41 of the internal inclined guiding mechanism 4 is rotatably disposed in the chamber 1. Preferably, there are multiple internal inclined guiding mechanisms 4, which are arranged according to the conveying path A of the inclined continuous plate 100. The other side (one side) of the plate 100 rests on the internal inclined guiding mechanisms 4, so as to guide the plate 100 to move forward smoothly.

[0066] In this embodiment, the chamber 1 contains a plurality of internal inclined guiding mechanisms 4, which are spaced apart. At least one support plate 5 may also be provided between the second rollers 41 of each pair of adjacent internal inclined guiding mechanisms 4 (e.g., ...). Figure 7 As shown, two support plates 5 can be provided between each pair of adjacent second rollers 41 of the internal inclined guide mechanism 4. The two support plates 5 can be close to the upper and lower ends of the second rollers 41, respectively. These support plates 5 are located between the second rollers 41 of adjacent two internal inclined guide mechanisms 4 and can be used to support the plate 100, so that the plate 100 can be smoothly conveyed along the conveying path A, so as to avoid deformation of the plate 100 during the conveying process.

[0067] The beneficial effects of this invention are as follows: The blasting machine provided by this invention, which obliquely guides a continuous sheet material within a blasting chamber, includes a chamber, at least four centrifugal impellers, at least one internal support mechanism, and at least one internal oblique guiding mechanism. The centrifugal impellers are respectively disposed on the two side walls of the chamber, and these impellers can propel the blasting particles along the sand discharge path to the surface of the sheet material. The internal support mechanism is disposed within the chamber, and one side of the sheet material can be placed on the internal support mechanism to guide the sheet material's movement within the chamber. The internal oblique guiding mechanism is disposed within the chamber, and the other side of the sheet material can rest against the internal oblique guiding mechanism, which guides the sheet material to maintain a set tilt angle. Therefore, this invention can transport the sheet material at an angle. When the blasting machine is blasting the surface of the sheet material, the blasting particles will naturally flow out of the inclined sheet material surface, preventing the blasting particles from accumulating on the surface and avoiding the problem of subsequent particles failing to hit the sheet material surface. Therefore, it eliminates the need for numerous sand removal devices, reducing equipment costs and energy consumption during operation.

[0068] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention.

Claims

1. A jetting machine for guiding a continuous sheet material diagonally in a jetting chamber, the jetting machine being arranged on a conveying path along which the sheet material is conveyed, characterized in that The sand blasting machine for guiding the continuous plate in the inclined direction in the blasting chamber comprises: a chamber with two side walls located at opposite sides of the chamber; at least four centrifugal impellers arranged on the two side walls of the chamber, the four centrifugal impellers are arranged separately and located at two sides of the plate, each of the four centrifugal impellers has a sand outlet path, and the four centrifugal impellers can spray the blasting particles to the surface of the plate along the sand outlet path; at least one internal support mechanism arranged in the chamber, one side of the plate can be placed on the internal support mechanism to guide the movement of the plate in the chamber; and at least one internal inclined guide mechanism arranged in the chamber, the other side of the plate can be placed on the internal inclined guide mechanism to maintain the set inclined angle of the plate by using the internal inclined guide mechanism; wherein the internal support mechanism comprises a first roller, two first shafts, two first bearing seats, two first bearings, two first sealing sleeves and two first taper sleeves, the two first shafts are connected to two ends of the first roller respectively, the two first shafts penetrate the two side walls of the chamber respectively, the two first bearings are arranged on the two first bearing seats respectively, the two first shafts are arranged in the two first bearings respectively, the two first bearing seats are arranged outside the two side walls of the chamber respectively, so that the first roller can be rotatably arranged in the chamber, the two first sealing sleeves are arranged between the two first bearing seats and the two side walls of the chamber respectively, the two first shafts penetrate the two first sealing sleeves respectively, the two first taper sleeves are fixed on the two side walls of the chamber respectively, the two first taper sleeves are sleeved on the two first shafts respectively and face the inner sides of the two side walls of the chamber, and the two first taper sleeves each have a first through hole for the first shaft to penetrate.

2. The jet machine of claim 1, wherein the jet machine further comprises a plurality of jet nozzles arranged in a row along the jet chamber, and the jet nozzles are arranged to direct the jet of the fluid at an angle to the direction of the continuous sheet. The four centrifugal impellers are arranged in an inclined manner corresponding to the plate.

3. The jet machine of claim 1, wherein the jet machine further comprises a plurality of jet nozzles arranged in a row along the jet chamber, and the jet nozzles are arranged to direct the jet stream at an angle of 30 to 60 degrees with respect to the longitudinal direction of the jet chamber. The chamber has a plurality of internal support mechanisms and a plurality of internal inclined guide mechanisms, the sand outlet path is arranged between adjacent two internal support mechanisms, and the sand outlet path is arranged between adjacent two internal inclined guide mechanisms.

4. The jet machine of claim 3, wherein the jet machine further comprises a plurality of jet nozzles arranged in a row along the jet chamber, and the jet nozzles are arranged to direct the jet stream at an angle of 30 to 60 degrees with respect to the longitudinal direction of the jet chamber. At least one support plate is arranged between the second rollers of each adjacent two internal inclined guide mechanisms, and the support plate can be used to support the plate.

5. The spraying machine for obliquely guiding a continuous sheet material within the spraying chamber according to claim 1, characterized in that, The outer side of the first roller is sleeved with an alloy protective tube, the outer edge of the alloy protective tube in contact with the plate forms a V-shaped groove shape, and the plate can be positioned.

6. The jet machine of claim 1, wherein the jet machine further comprises a plurality of jet nozzles disposed on the jet head, and a plurality of jet chambers disposed on the jet head, each of the plurality of jet chambers being in fluid communication with one of the plurality of jet nozzles, and each of the plurality of jet chambers being in fluid communication with the jet head channel. The two first taper sleeves are hollow conical bodies, the diameters of the two first taper sleeves gradually increase in the direction away from the first roller, and the first taper sleeve is provided with a particle outlet hole facing the ground.

7. The spraying machine for obliquely guiding a continuous sheet material within the spraying chamber according to claim 1, characterized in that, The inner inclined guide mechanism comprises a second roller, two second shafts, two second bearing seats, two second bearings, two second sealing sleeve rings and two second taper sleeves. The two second shafts are respectively connected to two ends of the second roller. The two second bearings are respectively arranged on the two second bearing seats. The two second shafts are respectively arranged in the two second bearings. The two second bearing seats are arranged on the inner side of the side wall of the chamber. The second roller is arranged in the chamber in an inclined and rotatable manner. The two second sealing sleeve rings are respectively arranged on the two second bearing seats. The two second shafts pass through the two second sealing sleeve rings. The two second taper sleeves are respectively sleeved on the two second shafts and face the second bearing seat. The two second taper sleeves each have a second through hole for the second shaft to pass through.

8. The spraying machine for obliquely guiding a continuous sheet material within the spraying chamber according to claim 7, characterized in that, The two second taper sleeves are hollow conical bodies. The two second taper sleeves gradually increase in diameter in a direction away from the second roller.

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