CN216831448U - Extrusion device of 3D printer - Google Patents

Abstract

The utility model provides an extrusion device of 3D printer, include: a feeding box is arranged at the upper end of the cylindrical structure, and a feeding hopper is arranged on the feeding box; the heating component is arranged outside the cylindrical structure; the heating component is connected with the controller; an extrusion assembly is arranged in the cylindrical structure and extrudes the molten melt in the cylindrical structure to the lower end of the cylindrical structure; the extrusion assembly is connected with the controller; the inlet end of the precision extrusion assembly is connected with the lower end of the cylindrical structure; the nozzle is arranged at the outlet end of the precision extrusion assembly; the compression roller assembly is connected outside the precision extrusion assembly through the frame, and the compression roller of the compression roller assembly is positioned at the rear side of the nozzle. The utility model can realize the further pressurization and compaction of the melt by arranging the precise extrusion assembly, and the melt is uniformly distributed, the internal stress is reduced, and the anisotropy is improved; in addition, the precise extrusion assembly can also uniformly extrude the melt with required flow precision, thereby improving the molding quality of the melt molding piece.

Description

Extrusion device of 3D printer

Technical Field

The utility model relates to a technical field of 3D printer especially relates to an extrusion device's of 3D printer technical field.

Background

At present, 3D printing is increasingly widely applied in the industry, and the existing 3D printing of the wire rod depends on conveying, heating and extruding the wire rod and is matched with a moving mechanism to print out a required shape; the existing large-flow 3D printing extrusion equipment heats and melts materials by an external heater, melts are extruded from a gun barrel by a screw rod, and the required shape is printed by a matching mechanism.

As shown in patent document CN106671246A, a domestic ceramic 3D printing extrusion molding device and method includes a discharge part, a control part and an extrusion part; the storing part stores the printing material, and then the control part controls the extruding part to extrude the ceramic material to form the ceramic material.

However, in this patent, the material forming the melt is extruded only by means of an extrusion section (screw), and the extrusion flow rate is not fine enough; and extrusion through the screw easily leads to unstable flow, finally influences the quality of the printing finished product.

In addition, in the prior art, the extruded material is generally rolled by a nozzle directly, the extruded material is rolled by utilizing the distance between the nozzle and the material on the upper layer, and the layer height is adjusted by adjusting the distance between the nozzle and the material on the upper layer; however, the flattening of the nozzle may result in partial unevenness, and when multiple layers of material are stacked, the accuracy of the stacked molded part is reduced; in addition, the existing materials need to be solidified after automatic cooling, and melt deformation may occur in the process.

Disclosure of Invention

In view of the above prior art's shortcoming, the utility model aims at providing an extrusion device of 3D printer for extrude not enough flow and can not accurate control among the solution prior art, and the nozzle rolls out the coarse problem of the formed part that does not meticulously result in.

To achieve the above objects and other related objects, the present invention provides an extrusion apparatus for a 3D printer, including:

the feeding device comprises a cylindrical structure, wherein a feeding box is arranged at the upper end of the cylindrical structure, and a feeding hopper is arranged on the feeding box;

the heating assembly is arranged outside the cylindrical structure; the heating assembly is connected with the controller;

the extruding component is arranged in the cylindrical structure, and extrudes the molten melt in the cylindrical structure to the lower end of the cylindrical structure; the extrusion assembly is connected with the controller;

the inlet end of the precise extrusion assembly is connected with the lower end of the cylindrical structure;

the nozzle is arranged at the outlet end of the precision extrusion assembly;

and the compression roller assembly is connected outside the precision extrusion assembly through a rack, and a compression roller of the compression roller assembly is positioned at the rear side of the nozzle.

Preferably: the extrusion assembly comprises a driving motor and a screw; the driving motor drives the screw to rotate, and the screw is arranged in the cylindrical structure.

Preferably: the heating assembly comprises a plurality of ceramic heating sleeves, the ceramic heating sleeves are arranged along the axial direction of the tubular structure, and each ceramic heating sleeve is clamped outside the tubular structure.

Preferably: the precise extrusion assembly comprises a driving piece, a speed reducer and an extruder; the extruder is arranged at the lower end of the cylindrical structure; the driving piece drives the extruder through the speed reducer, and two parallel gear structures are arranged in the extruder.

Preferably: the pressure sensor is arranged on the extruder and connected to the controller.

Preferably: the temperature sensor is arranged on the extruder and connected to the controller.

Preferably: the method comprises the following steps: the heat preservation subassembly, the heat preservation subassembly is located the nozzle.

Preferably: the feed hopper comprises a hopper and an oblique inlet pipe; the hopper is connected with the upper end of the oblique inlet pipe, and the lower end of the oblique inlet pipe is connected to one side of the feeding box.

Preferably: the compression roller assembly comprises the rack, a base, the compression roller and a sliding assembly; the base is provided with the nozzle in a penetrating manner, and the base is provided with a sliding assembly which is connected to the rack in a sliding manner; and a compression roller is arranged below the base, and a cooling loop is arranged in the compression roller.

Preferably: the compression roller assembly further comprises a rotating assembly, the rotating assembly is arranged on the base, and the rotating assembly drives the compression roller to rotate.

As above, the utility model discloses an extrusion device of 3D printer has following beneficial effect:

the utility model can realize the further pressurization and compaction of the melt by arranging the precise extrusion assembly, and the melt is uniformly distributed, the internal stress is reduced, and the anisotropy is improved; in addition, the precise extrusion assembly can also uniformly extrude the melt with required flow precision, thereby improving the molding quality of the melt molding piece. Additionally, the utility model discloses a temperature sensor who sets up can guarantee that heating element's heating effect is even stable.

Drawings

Fig. 1 shows a perspective view of an extrusion device of a 3D printer according to the present invention;

FIG. 2 shows an enlarged view of A of FIG. 1;

fig. 3 shows a cross-sectional view of an angle of an extrusion device of a 3D printer according to the present invention;

fig. 4 is a cross-sectional view of the extrusion device of the 3D printer according to another angle of the present invention;

fig. 5 is a perspective view of a press roller assembly of an extrusion device of a 3D printer according to the present invention;

fig. 6 shows that the utility model discloses a cross-sectional view of the compression roller assembly of extrusion device of 3D printer

Fig. 7 is a cross-sectional view of B-B of fig. 6.

Description of the element reference numerals

1 tubular structure

1a temperature sensor

11 feeding box

111 feeding hopper

111a hopper

111b oblique inlet pipe

2 heating assembly

21 ceramic heating jacket

21a circular arc sheet body

21b boss structure

3 extrusion assembly

31 driving motor

31a speed reducer

31b bearing housing

32 screw

4 precision extrusion assembly

41 drive element

42 speed reducer

43 extruder

430 gear structure

431 pressure sensor

432 temperature sensor

5 spray nozzle

51 heat preservation subassembly

6 compression roller assembly

61 frame

62 base

63 pressure roller

631 mounting rack

64 sliding assembly

64a slide rail

64b sliding plate

64c slide block

65 rotating assembly

651 electric motor

652 drive belt assembly

652a driving wheel

652b driven wheel

66 cooling circuit

661 cooling inlet pipe

662 cooling outlet pipe

71 annular cavity

72 annular cavity

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Please refer to fig. 1 to 7. It should be understood that the structures, the proportions, the sizes, etc. shown in the drawings of the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention does not have the substantial technical significance, and the modification of any structure, the change of the proportion relation or the adjustment of the size should still fall within the scope that the technical contents disclosed in the present invention can cover without affecting the efficacy and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

As shown in fig. 1, the utility model provides an extrusion device of 3D printer, include:

the device comprises a cylindrical structure 1, wherein a feeding box 11 is arranged at the upper end of the cylindrical structure 1, and a feeding hopper 111 is arranged on the feeding box 11;

the heating component 2 is arranged on the outer side of the cylindrical structure 1; the heating component 2 is connected with a controller;

the extrusion component 3 is arranged in the cylindrical structure 1, and the extrusion component 3 extrudes the molten melt in the cylindrical structure 1 to the lower end of the cylindrical structure 1; the extrusion assembly 3 is connected with a controller;

the inlet end of the precise extrusion component 4 is connected with the lower end of the cylindrical structure 1;

the nozzle 5 is arranged at the lower end of the extrusion assembly 4;

the press roller assembly 6 is connected outside the precision extrusion assembly 4 through a frame 61, and a press roller 63 of the press roller assembly 6 is positioned at the rear side of the nozzle 5.

The feeding hopper 11 is arranged on the cylindrical structure 1, so that the material to be printed can enter the feeding hopper 11, the material is heated through the cylindrical structure 1, and the material is converted into a molten melt; because the time for the melt to flow out of the cylindrical structure 1 is long, in order to improve the output efficiency of the melt flowing out of the cylindrical structure 1, the flow efficiency of the melt is improved by arranging the extrusion component 3 in the cylindrical structure 1, and the control on the flow of the melt can be realized by controlling the working efficiency of the extrusion component 3; in addition, because the flow control of the melt extruded by the extrusion assembly 3 is not fine enough, the precision extrusion assembly 4 is arranged under the cylindrical structure 1, so that the flow precision of the extruded melt is higher, and the 3D printing quality is improved; the existing method is generally used for directly realizing the flattening of extruded melt through the nozzle 5, the surface quality of the flattened melt cannot be accurately guaranteed, the compression roller assembly 6 is arranged at present, the surface quality of the flattened melt can be effectively guaranteed, and the extruded material is enabled to be rapidly cooled.

In order to realize controllable extrusion of the melt from the tubular structure 1, the extrusion assembly 3 is provided with a driving motor 31 and an extrusion part; the extrusion is a screw 32; the drive motor 31 drives the screw 32 to rotate, and the screw 32 is disposed in the tubular structure 1. The screw 32 ensures that the melt is extruded during the process of increasing pressure.

Since the nominal rotational speed of the motor may not be adapted to the rotational speed required by the spindle 32 and in order to increase a certain torque; now, a speed reducer 31a is disposed under the motor 31, and the motor drives the screw 32 through the speed reducer 31 a.

In order to be able to make the rotation of the screw 32 smoother, a bearing housing 31b is now provided between the reduction gear 31a and the feed housing 11, and a bearing is provided in the axial housing 31b to lubricate and support the rotation of the upper end of the screw 32.

In order to avoid cooling of the melt during the flow in the barrel structure 1, which could solidify in the barrel structure 1 and cause blockages; now, a heating component 2 is arranged outside the cylinder structure 1; specifically, the heating assembly 2 includes a plurality of ceramic heating jackets 21, and the plurality of ceramic heating jackets 21 are arranged along the axial direction of the tubular structure 1.

In order to facilitate the fixing of the ceramic heating jacket 21 on the tubular structure 1; specifically, as shown in fig. 1 and 2, the ceramic heating jacket 21 includes two circular arc-shaped sheet bodies 21a, and the two circular arc-shaped sheet bodies 21a can be combined to form the ceramic heating jacket 21; the cylinder structure 1 is clamped by two ceramic heating jackets 21.

In order to enable the two circular arc-shaped sheet bodies 21a to be fixed; as shown in fig. 2, one side of each circular arc sheet body 21a is provided with a boss structure 21 b; the user fixes the two circular arc-shaped sheet bodies 21a by connecting the boss structures 21b of the two different circular arc-shaped sheet bodies 21a by bolts.

In order to realize that the ceramic heating jackets 21 can realize heating, a thermal resistance type heating sheet is arranged in each ceramic heating jacket 21 and is connected with a power supply; as shown in fig. 2, the power source is provided on one side of the cylindrical structure 1 through a power cord holder.

In order to sense the temperature of the melt in the barrel structure 1 in real time, a temperature sensor 1a is now provided in the barrel structure 1.

Although the screw 32 can extrude the melt, the discharge amount per unit time and the like are difficult to control accurately; therefore, in order to realize the fineness of flow control, the quality of the 3D printing formed part is improved; a precise extrusion assembly 4 is arranged below the cylindrical structure 1, and the precise extrusion assembly 4 comprises a driving part 41, a speed reducer 42 and an extruder 43; the driving of the driving member 41 is transmitted to the extruder 43 through the decelerator 42; specifically, two gear structures 430 are arranged in the extruder 43, and the melt is extruded downwards after being extruded by the two gear structures 430 from the upper part. The melt is compressed by the two gear structures 430, so that the melt is uniform and dense, the internal stress is reduced, the anisotropy is improved, and the fine control of the extrusion flow is realized.

In order to make the melt more compact and uniform and improve the anisotropy of the melt; the pressure in the precision extrusion assembly 4 needs to be increased, which is changed by controlling the speed difference between the feeding of the screw 32 and the discharging of the precision extrusion system 4, that is, the feeding speed of the screw 32 is increased, and the discharging speed of the precision extrusion assembly 4 is decreased, so that the melt is accumulated in the precision extrusion system 4 to increase the pressure on the melt.

Since the higher the pressure of the melt is, the better, the different demands for melts of different materials or required molded parts will result in different preferred values of the pressure of the melt; in order to be able to quickly adapt to such pressure differences and to adapt the pressure inside the precision extrusion system 4 to such preferred pressure values, a pressure sensor 431 is now provided at the extruder 43, and the pressure sensor 431 is connected to the controller. The controller can control the feeding amount of the precise extrusion assembly 4 in unit time by controlling the rotating speed of the screw 32, and can control the extrusion amount of the precise extrusion assembly 4 in unit time by controlling the extruder 43, so that the purpose of changing the pressure in the precise extrusion assembly 4 by controlling the speed difference between the feeding of the screw 32 and the discharging of the precise extrusion system 4 is achieved.

In order to ensure the quality of the molded part after 3D printing and the temperature of the melt exiting from the nozzle 5 also has a preferred value, a temperature sensor 432 is provided at the extruder 43, and the temperature sensor 432 is connected to the controller; the controller can sense the temperature of the melt in the extruder 43, and further regulate and control the temperature of the melt through the heat preservation assembly 51.

Further, in order to ensure the temperature and the state of the melt, a heat preservation component 51 is arranged at the nozzle 5; the heat retaining assembly 51 is capable of continuously heating the melt during its extrusion from the nozzle 5.

In order to realize the feeding to the feeding box 11, the melt is extruded downwards through the cylindrical structure 1; now, a feeding hopper 111 is arranged on the feeding box 11, specifically, the feeding hopper 111 includes a hopper 111a and an oblique inlet pipe 111 b; the hopper 111a is connected to one side of the feed box 11 through an inclined inlet pipe.

In order to improve the printing speed and realize continuous flattening of the melt; now a press roll assembly is arranged below the extruder 43 of the precision extrusion assembly 4; specifically, the press roller assembly 6 is connected to the outside of the precision extrusion assembly 4 through a frame 61, and a press roller 63 of the press roller assembly 6 is positioned at the rear side of the nozzle 5. Therefore, when the melt is extruded from the nozzle 5, the extruded melt can be immediately flattened by the pressing roller 63 located at the rear.

The whole extrusion device can move in height along with the travelling crane or the hoisting device, so that a layer of melt is formed; after the extrusion device is moved in height, the height distance between the compression rollers 63 before and after the compression rollers 63 are moved is stable by controlling the fixation of the compression rollers 63 in the height direction on the extrusion device, so that the layer height of each layer of the melt can be well controlled, and the anisotropy of the flattening process can be improved.

In order to realize the fixation of the compression roller assembly 6 and the precision extrusion assembly 4; as shown in fig. 4, specifically, the pressing roller assembly 6 includes a frame 61, a base 62, and a pressing roller 63; the press roller 63 is arranged below the base 62, the base 62 is connected to the frame 61, and the inner wall of the frame 61 is fixed on the periphery of the precision extrusion assembly 4.

Since the layer height requirements of the melt may be different for each layer, the height of the melt can be adjusted by the pressure roller 63; now the slide assembly 64 is provided at the base 62; as shown in fig. 5, specifically, the sliding assembly 64 includes a sliding rail 64a, a sliding plate 64b, and a sliding block 64 c; the base 62 is connected with a sliding plate 64b, the sliding plate 64b is provided with a sliding rail 64a, and the sliding rail 64a is fixedly provided with a sliding block 64 c; a lead screw penetrates through the sliding block 64c and is connected with a motor 640, and the motor 640 is arranged on the rack 61. The controller can control the slide block 64c to move up and down along with the screw rod, so that the slide rail 64a moves up and down together, thereby controlling the up and down movement of the base 62, thereby indirectly controlling the height of the press roller 63, and further controlling the height between layers of the press roller 63 after the extrusion device moves up and down.

Since the extrusion device may move in any direction on the printing platform, it is necessary to make the rolling direction of the pressure roller 63 and the moving direction of the extrusion device consistent, and it is necessary to make the pressure roller 63 rotate. Now still be equipped with runner assembly 65 on compression roller assembly 6, runner assembly 65 locates on base 62, and runner assembly 65 drives the compression roller 63 rotatory. The rotating assembly 65 includes a motor 651 and a belt assembly 652; the motor 651 is arranged at one end of the base 62, and the motor 651 drives the mounting rack 631 of the pressing roller 63 to rotate through the transmission assembly 652, so that the pressing roller 63 rotates.

In order to measure the pressure of the pressing roller 63 on the melt, a pressure sensor can be arranged between the mounting frame 631 and the driven wheel 652b so as to sense the pressure of the pressing roller 63 on the melt; meanwhile, the pressure sensor is connected with a controller, and the controller can control the sliding assembly 64 to realize the ascending and descending of the pressing roller 63 and change the pressure value received by the pressing roller 63; in addition, the controller may also determine whether the printing quality is abnormal through a vertical change of the pressure sensor.

To enable the belt assembly 652 to transmit power from the motor 651 to the mounting bracket; specifically, the belt assembly 652 is now provided to include a drive pulley 652a, a drive belt, and a driven pulley 652 b; the motor 651 rotates the capstan 652a, and the capstan 652a rotates via the belt pulley 652b, thereby rotating the mounting bracket 631 mounted under the driven pulley 652 b.

In order to allow the pressure roller 63 to rotate around the nozzle 5; a hollow rotating shaft penetrates through the base 62, and a nozzle 5 is arranged in the rotating shaft; the driven wheel 652b is sleeved on the rotating shaft. So that the installation frame 631 rotates about the nozzle 5 when rotated, and thus the pressing roller 63 rotates about the nozzle 5.

In order to cool the pressing roller 63, so that the melt can be instantly cooled and molded while being flattened by the pressing roller 63; now, a cooling circuit 66 is provided in the pressing roll 63, and both ends of the cooling circuit are connected to a cooling inlet pipe 661 and a cooling outlet pipe 662, respectively.

To avoid the winding and tearing of the cooling inlet pipe 661 and a cooling outlet pipe 662 caused by the rotation of the press roller 63; the cooling inlet pipe 661 and the cooling outlet pipe 662 are provided in the side wall of the rotating shaft so that the rotating shaft can rotate together with the driven pulley 652 b.

To enable water supply to the cooling inlet tube 661 and water discharge to the cooling outlet tube 662; as shown in fig. 7, two annular chambers having different heights are provided between the rotating shaft and the rotating shaft housing, the cooling inlet pipe 661 is connected to the annular chamber 71 for inlet water, and the cooling outlet pipe 662 is connected to the annular chamber 72 for outlet water.

In order to avoid that the annular chamber 71 seeps water into the annular chamber 72, a sealing ring 73 is arranged between the two annular chambers, and the sealing ring 73 is arranged between the rotating shaft and the rotating shaft shell.

Further, in order to realize real-time control of the cooling temperature of the pressure roller 63, a non-contact laser temperature sensor may be provided at one side of the pressure roller 63 to detect the temperature of the pressure roller 63 in real time. And the laser temperature sensor is connected with the controller, so that the controller controls the power of the water cooling machine connected with the cooling loop, and the temperature control of the compression roller 63 is realized.

In summary, the utility model can realize the further pressurization and compaction of the melt by arranging the precise extrusion component 4, and the melt is uniformly distributed, the internal stress is reduced, and the anisotropy is improved; in addition, the precise extrusion assembly 4 can also uniformly extrude the melt with required flow precision, thereby improving the molding quality of the melt molding piece. In addition, the utility model can ensure the heating effect of the heating component 2 to be even and stable through the arranged temperature sensor 1 a; additionally, the utility model discloses a subassembly 4 is extruded in precision configuration pressure sensor 431 and temperature sensor 432, can monitor the entry, outlet pressure and the fuse-element temperature that subassembly 4 was extruded in precision, and the controller carries rotational speed and the 41 rotational speed control fuse-element pressure of the driving piece to the setting value of subassembly 4 is extruded in precision through configuration screw rod 32. In addition, the utility model discloses set up compression roller assembly 6 and can realize flattening fast to the fuse-element, thereby make every layer of fuse-element even, promote the uniformity and the printing quality of printing every layer, promote the efficiency of printing the shaping; in addition, the utility model can realize the 3D printing with variable cross section by the sliding component 64 of the compression roller component 6, and the layer height of each layer of melt is changed; additionally, the utility model discloses a cooling circuit that sets up at compression roller assembly 6 can realize compression roller 63's cooling effect.

Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the claims of the present invention.

Claims (10)

1. An extrusion device of a 3D printer, comprising:

the feeding device comprises a cylindrical structure, wherein a feeding box is arranged at the upper end of the cylindrical structure, and a feeding hopper is arranged on the feeding box;

the heating assembly is arranged outside the cylindrical structure; the heating assembly is connected with the controller;

the extruding component is arranged in the cylindrical structure, and extrudes the molten melt in the cylindrical structure to the lower end of the cylindrical structure; the extrusion assembly is connected with the controller;

the inlet end of the precise extrusion assembly is connected with the lower end of the cylindrical structure;

the nozzle is arranged at the outlet end of the precision extrusion assembly;

and the compression roller assembly is connected outside the precision extrusion assembly through a rack, and a compression roller of the compression roller assembly is positioned at the rear side of the nozzle.

2. The extrusion apparatus of the 3D printer according to claim 1, wherein: the extrusion assembly comprises a driving motor and an extrusion piece; the extrusion piece is a screw rod, the driving motor drives the screw rod to rotate, and the screw rod is arranged in the cylindrical structure.

3. The extrusion apparatus of the 3D printer according to claim 1, wherein: the heating assembly comprises a plurality of ceramic heating sleeves, the ceramic heating sleeves are arranged along the axial direction of the tubular structure, and each ceramic heating sleeve is clamped outside the tubular structure.

4. The extrusion apparatus of the 3D printer according to claim 1, wherein: the precise extrusion assembly comprises a driving piece, a speed reducer and an extruder; the extruder is arranged at the lower end of the cylindrical structure; the driving piece drives the extruder through the speed reducer, and two parallel gear structures are arranged in the extruder.

5. The extrusion apparatus of the 3D printer according to claim 4, wherein: the pressure sensor is arranged on the extruder and connected to the controller.

6. The extrusion apparatus of the 3D printer according to claim 4, wherein: the temperature sensor is arranged on the extruder and connected to the controller.

7. The extrusion apparatus of the 3D printer according to claim 1, wherein: the method comprises the following steps: the heat preservation subassembly, the heat preservation subassembly is located the nozzle.

8. The extrusion apparatus of the 3D printer according to claim 1, wherein: the feed hopper comprises a hopper and an oblique inlet pipe; the hopper is connected with the upper end of the oblique inlet pipe, and the lower end of the oblique inlet pipe is connected to one side of the feeding box.

9. The extrusion apparatus of the 3D printer according to claim 1, wherein: the compression roller assembly comprises the rack, a base, the compression roller and a sliding assembly; the base is provided with the nozzle in a penetrating manner, and the base is provided with a sliding assembly which is connected to the rack in a sliding manner; and a compression roller is arranged below the base, and a cooling loop is arranged in the compression roller.

10. The extrusion apparatus of the 3D printer according to claim 9, wherein: the compression roller assembly further comprises a rotating assembly, the rotating assembly is arranged on the base, and the rotating assembly drives the compression roller to rotate.

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