Powder coating collecting equipment

Abstract

The invention discloses powder coating collecting equipment, and relates to the field of collecting equipment, the powder coating collecting equipment comprises a moving shell, the top of the moving shell is provided with a collecting shell, the collecting shell is internally provided with a scattering mechanism, the scattering mechanism comprises a first gear, and the outer wall of the first gear is engaged with two sets of second gears; and two sets of rotating pipes are arranged on one side of the collecting shell in a penetrating mode, air cylinders are fixedly installed in the two sets of rotating pipes, and sliding blocks are fixedly installed at the output ends of the two sets of air cylinders. According to the stirring device, two groups of rotating pipes and four groups of stirring blades are arranged, the two groups of rotating pipes drive the four groups of stirring blades to rotate in the rotating process, so that the four groups of stirring blades rotate by taking the two groups of rotating pipes as centers, and due to different angles of the four groups of stirring blades, when four groups of third gears rotate, the four groups of stirring blades are driven to rotate respectively; and the agglomerated powder in the collecting shell is stirred and scattered, and the four sets of stirring blades can scatter the powder in the collecting shell more sufficiently.

Description

Technical Field

[0001] The invention relates to the technical field of collecting equipment, in particular to a powder coating collecting equipment. Background Art

[0002] Powder coating is a solid powdered synthetic resin coating composed of solid resin, pigment, filler and additives. Unlike ordinary solvent-based coatings and water-based coatings, its dispersion medium is air instead of solvent and water. Due to the discontinuity of the workpiece during spraying, the quality of the powder itself, and the influence of the spraying stroke, there will always be some powder that is not fully utilized. The powder coating that fails to adhere to the surface of the workpiece will be scattered on the ground, and the scattered powder needs to be collected.

[0003] In the prior art, for example, a powder coating collection and recovery device with Chinese patent number CN219003980U includes a crushing device for crushing and preliminarily separating the collected powder coating; a particle size classification device, which forms a cavity inside, and a plurality of particle size classification plates placed in parallel are arranged in the cavity, and the plurality of particle size classification plates are arranged at intervals to divide the cavity into a plurality of sub-cavities, and the input port of the particle size classification device is sealed and connected with the output port of the crushing device; a recovery device, which is detachably arranged on the side of the particle size classification device facing the ground and is connected with the sub-cavity, and each sub-cavity is respectively provided with a recovery device to recover the powder coating in each sub-cavity; and a vacuum device, the input port of the vacuum device is sealed and connected with the output port of the particle size classification device, and provides airflow for the separation and sedimentation of the powder coating in the crushing device and the particle size classification device.

[0004] However, in the prior art, when the air humidity is high, the recovered powder is contaminated with moisture in the air and easily condenses into agglomerates. The recovered powder must be screened to remove impurities before being reused. However, it is not easy to remove impurities from the agglomerated powder, and therefore it is not convenient to recycle the powder. In view of the above problems, a powder coating collection device is proposed. Summary of the invention

[0005] The object of the present invention is to provide a powder coating collection device to solve the problem raised in the above background technology that when the air humidity is high, the recovered powder is contaminated with moisture in the air and easily condenses into agglomerates, and the recovered powder must be screened to remove impurities before being reused, but the agglomerated powder is not easy to remove impurities, and therefore it is not easy to recycle the powder.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a powder coating collection device, comprising a moving shell, a collecting shell is arranged on the top of the moving shell, a scattering mechanism is arranged inside the collecting shell, the scattering mechanism comprises a No. 1 gear, the outer wall of the No. 1 gear is meshed with two groups of No. 2 gears, two groups of rotating tubes are arranged through one side of the collecting shell, cylinders are fixedly installed inside the two groups of rotating tubes, sliding blocks are fixedly installed on the output ends of the two groups of cylinders, racks are fixedly installed on one side of the two groups of sliding blocks, No. 3 gears are meshed on the outer walls of the four groups of racks, stirring blades are fixedly installed on one side of the four groups of No. 3 gears, two groups of discharge pipes are installed through the bottom of the collecting shell, No. 2 filters are fixedly installed on one end of the two groups of discharge pipes, three groups of infrared tubes are fixedly installed on the inner wall of the collecting shell, and four groups of moving wheels are fixedly installed on the bottom of the moving shell.

[0007] Preferably, a feeding mechanism is provided on the top of the collecting shell, and the feeding mechanism comprises a feeding shell, a No. 1 filter screen is fixedly installed on the bottom of the feeding shell, and a dust cover is provided on the top of the feeding shell.

[0008] Preferably, an oscillation mechanism is arranged inside the movable shell, and the oscillation mechanism includes a reduction motor, and the output end of the reduction motor is transmission-connected with a rotating shaft, and two groups of cams are arranged inside the movable shell, and rotating wheels are fixedly mounted on one side of the two groups of cams, and the outer walls of the two groups of rotating wheels are transmission-connected with a No. 1 transmission belt.

[0009] Preferably, rollers are provided above the two groups of cams, the tops of the two groups of rollers are rotatably connected to moving rods, one end of the two groups of moving rods penetrates the inner wall of the moving shell, and the tops of the two groups of moving rods are rotatably connected to the bottom of the collection shell.

[0010] Preferably, a No. 1 transmission wheel is fixedly mounted on one end of the rotating shaft, a No. 2 transmission belt is arranged on the outer wall of the No. 1 transmission wheel, a No. 2 transmission wheel is arranged on one end of the No. 2 transmission belt, and one side of the No. 2 transmission wheel is fixedly connected to one side of the No. 1 gear.

[0011] Preferably, the outer wall of the reduction motor is fixedly connected to the inner wall of the moving shell, and one end of the rotating shaft is installed through the inside of a group of cams.

[0012] Preferably, the bottom of the feeding shell is fixedly connected to the top of the collecting shell, and the bottom of the No. 1 filter screen is in contact with the top of the collecting shell.

[0013] Preferably, one side of the first gear is rotatably connected to one side of the collecting shell, and the two sets of the second gears are both arranged on one side of the collecting shell.

[0014] Preferably, one end of the two groups of rotating tubes is respectively installed through the inside of the two groups of second gears, and the outer walls of the two groups of sliding blocks are respectively slidably connected to the inner walls of the two groups of rotating tubes.

[0015] Preferably, one side of the four groups of stirring blades penetrates the outer walls of the two groups of rotating tubes respectively, and the bottoms of the two groups of No. 2 filter screens are fixedly connected to the inner wall of the collecting shell.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, two groups of rotating tubes and four groups of stirring blades are provided. The two groups of rotating tubes drive the four groups of stirring blades to rotate during the rotation process, so that the four groups of stirring blades rotate with the two groups of rotating tubes as the center. Since the angles of the four groups of stirring blades are different, when the four groups of No. 3 gears rotate, they respectively drive the four groups of stirring blades to rotate, thereby stirring and breaking up the agglomerated powder inside the collecting shell. The four groups of stirring blades can break up the powder inside the collecting shell more fully. By providing three groups of infrared tubes and connecting the three groups of infrared tubes to power, the three groups of infrared tubes generate heat and heat the powder inside the collecting shell, thereby accelerating the evaporation of water between the powders. In cooperation with the four groups of stirring blades, the agglomerated powder can be broken up and dried more quickly. By providing four groups of moving wheels, the movement of the moving shell is facilitated, thereby making it more convenient to collect the spilled powder.

[0017] 2. In the present invention, two groups of cams, two groups of rollers and two groups of moving rods are arranged. Since the protruding parts of the two groups of cams are opposite, the two groups of cams drive the two groups of rollers to move up and down intermittently, so that the two groups of moving rods move up and down alternately, thereby driving the collecting shell to oscillate left and right. The collecting shell oscillates the powder to help break up the clumped powder, and facilitate the broken powder to flow out from the two groups of discharge pipes, which is convenient for the subsequent removal of impurities from the powder.

[0018] 3. In the present invention, by setting a No. 1 filter, the oscillation mechanism makes the collecting shell oscillate left and right, and then the collecting shell drives the feeding shell to oscillate left and right, so that the agglomerated powder is shaken and loosened, and falls from the filter holes of the No. 1 filter, thereby achieving preliminary breakup of the agglomerated powder, which is convenient for subsequent drying and further breakup of the powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a powder coating collection device of the present invention; Figure 2 It is a structural cross-sectional view of a powder coating collecting device of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of a feeding mechanism and a scattering mechanism of a powder coating collecting device of the present invention; Figure 4 A three-dimensional structural cross-sectional view of a rotating tube of a powder coating collecting device of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of a discharge pipe of a powder coating collection device of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of an oscillating mechanism of a powder coating collecting device of the present invention; Figure 7 This is a three-dimensional structural explosion diagram of an oscillation mechanism of a powder coating collecting device of the present invention.

[0020] In the figure: 1. moving shell; 2. collecting shell; 3. feeding mechanism; 31. feeding shell; 32. No. 1 filter; 33. dust cover; 4. scattering mechanism; 41. No. 1 gear; 42. No. 2 gear; 43. rotating tube; 44. cylinder; 45. sliding block; 46. rack; 47. No. 3 gear; 48. stirring blade; 49. discharging pipe; 410. No. 2 filter; 411. infrared tube; 5. oscillation mechanism; 51. reduction motor; 52. rotating shaft; 53. cam; 54. rotating wheel; 55. No. 1 transmission belt; 56. roller; 57. moving rod; 58. No. 1 transmission wheel; 59. No. 2 transmission belt; 510. No. 2 transmission wheel; 6. moving wheel. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1 Reference Figure 1-5As shown: A powder coating collection device comprises a moving shell 1, a collecting shell 2 is arranged on the top of the moving shell 1, a scattering mechanism 4 is arranged inside the collecting shell 2, the scattering mechanism 4 comprises a No. 1 gear 41, two groups of No. 2 gears 42 are meshed with the outer wall of the No. 1 gear 41, two groups of rotating tubes 43 are arranged through one side of the collecting shell 2, cylinders 44 are fixedly installed inside the two groups of rotating tubes 43, sliding blocks 45 are fixedly installed at the output ends of the two groups of cylinders 44, racks 46 are fixedly installed on one side of the two groups of sliding blocks 45, three gears 47 are meshed with the outer walls of the four groups of racks 46, stirring blades 48 are fixedly installed on one side of the four groups of three gears 47, and the collecting Two groups of discharge pipes 49 are installed through the bottom of the collecting shell 2, and one end of the two groups of discharge pipes 49 is fixedly installed with a No. 2 filter screen 410, and four groups of moving wheels 6 are fixedly installed on the bottom of the movable shell 1. One side of the No. 1 gear 41 is rotatably connected to one side of the collecting shell 2, and two groups of No. 2 gears 42 are both arranged on one side of the collecting shell 2. One end of the two groups of rotating tubes 43 are respectively installed through the inside of the two groups of No. 2 gears 42, and the outer walls of the two groups of sliding blocks 45 are respectively slidably connected to the inner walls of the two groups of rotating tubes 43, and one side of the four groups of stirring blades 48 respectively penetrate the outer walls of the two groups of rotating tubes 43, and the bottoms of the two groups of No. 2 filters 410 are fixedly connected to the inner wall of the collecting shell 2.

[0023] In this embodiment, the staff pours the spilled powder into the interior of the collecting shell 2, and then starts the reduction motor 51 to rotate the No. 1 gear 41, and then the two groups of No. 1 gears 41 drive the two groups of No. 2 gears 42 to rotate, and further, the two groups of No. 2 gears 42 drive the two groups of rotating tubes 43 to rotate, and the two groups of cylinders 44 extend to drive the two groups of sliding blocks 45 to move, and the two groups of sliding blocks 45 slide inside the two groups of rotating tubes 43, and then the two groups of sliding blocks 45 drive the four groups of racks 46 to move, and the two groups of racks 46 slide inside the rotating tubes 43, and further, the four groups of racks 46 respectively drive the four groups of No. 3 gears 47 to rotate, and then the four groups of No. 3 gears 47 drive the four groups of stirring blades 48 to rotate, and by providing two groups of rotating tubes 43 and four groups of stirring blades 48, the two groups of rotating tubes 43 drive the four groups of stirring blades 48 to rotate during the rotation process, so that the four groups of stirring blades 48 use the two groups of rotating tubes 43 as The center rotates, and since the angles of the four groups of stirring blades 48 are different, when the four groups of No. 3 gears 47 rotate, they respectively drive the four groups of stirring blades 48 to rotate, thereby stirring and breaking up the agglomerated powder inside the collecting shell 2. The four groups of stirring blades 48 can break up the powder inside the collecting shell 2 more fully, and by setting up three groups of infrared tubes 411, the three groups of infrared tubes 411 are powered on, so that the three groups of infrared tubes 411 generate heat and heat the powder inside the collecting shell 2, thereby accelerating the evaporation of water between the powders, and cooperating with the four groups of stirring blades 48, the agglomerated powder can be broken up and dried faster, and then the powder with smaller particles leaks out from the two groups of No. 2 filters 410 and flows out from the two groups of discharge pipes 49, which is convenient for the subsequent removal of impurities and reuse of the powder. By setting up four groups of moving wheels 6, the movement of the moving shell 1 is facilitated, and the spilled powder can be collected more conveniently.

[0024] Embodiment 2 Figure 1 , Figure 2 , Figure 6 and Figure 7As shown, an oscillating mechanism 5 is arranged inside the moving shell 1, and the oscillating mechanism 5 includes a reduction motor 51, and the output end of the reduction motor 51 is connected to a rotating shaft 52 in a transmission manner. Two groups of cams 53 are arranged inside the moving shell 1, and a rotating wheel 54 is fixedly installed on one side of the two groups of cams 53. The outer walls of the two groups of rotating wheels 54 are connected to a No. 1 transmission belt 55 in a transmission manner. Rollers 56 are arranged above the two groups of cams 53, and the tops of the two groups of rollers 56 are connected to moving rods 57 in a rotational manner. One end of the two groups of moving rods 57 is penetrated The tops of the two groups of moving rods 57 are rotatably connected to the bottom of the collecting shell 2 through the inner wall of the moving shell 1. One end of the rotating shaft 52 is fixedly installed with a No. 1 transmission wheel 58. The outer wall of the No. 1 transmission wheel 58 is provided with a No. 2 transmission belt 59. One end of the No. 2 transmission belt 59 is provided with a No. 2 transmission wheel 510. One side of the No. 2 transmission wheel 510 is fixedly connected to one side of the No. 1 gear 41. The outer wall of the reduction motor 51 is fixedly connected to the inner wall of the moving shell 1. One end of the rotating shaft 52 is installed through a group of cams 53.

[0025] In this embodiment, when the staff pours the spilled powder into the interior of the collecting shell 2, the reduction motor 51 is started, and the four groups of stirring blades 48 rotate to stir and break up the powder, and the reduction motor 51 drives the rotating shaft 52 to rotate, and then the rotating shaft 52 drives a group of rotating wheels 54 to rotate, and then the rotating wheel 54 drives the No. 1 transmission belt 55 to rotate, and then the No. 1 transmission belt 55 drives another group of rotating wheels 54 to rotate, so that both groups of cams 53 are rotated. By setting two groups of cams 53, two groups of rollers 56 and two groups of moving rods 57, since the protruding parts of the two groups of cams 53 are opposite, the two groups of cams 53 drives two groups of rollers 56 to move up and down intermittently, so that two groups of moving rods 57 move up and down alternately, thereby driving the collecting shell 2 to oscillate left and right. The collecting shell 2 oscillates the powder to help break up the agglomerated powder, and facilitates the powder after breaking up to flow out from the two groups of discharge pipes 49, which is convenient for subsequent impurity removal of the powder. The rotating shaft 52 drives the No. 1 transmission wheel 58 to rotate, and then the No. 1 transmission wheel 58 drives the No. 2 transmission belt 59 to rotate, and the No. 2 transmission belt 59 drives the No. 2 transmission wheel 510 to rotate, so the No. 2 transmission wheel 510 drives the No. 1 gear 41 to rotate, and then the No. 1 gear 41 drives the two groups of No. 2 gears 42 to rotate.

[0026] Embodiment 3 according to Figure 1-3 As shown, a feeding mechanism 3 is provided on the top of the collecting shell 2, and the feeding mechanism 3 includes a feeding shell 31, a No. 1 filter screen 32 is fixedly installed on the bottom of the feeding shell 31, a dust cover 33 is provided on the top of the feeding shell 31, the bottom of the feeding shell 31 is fixedly connected to the top of the collecting shell 2, and the bottom of the No. 1 filter screen 32 is in contact with the top of the collecting shell 2.

[0027] In this embodiment, the dust cover 33 is first opened, and the spilled powder is poured into the interior of the feeding shell 31, and the powder is scattered on the top of the No. 1 filter screen 32. By setting the No. 1 filter screen 32, the oscillation mechanism 5 makes the collecting shell 2 oscillate left and right, and then the collecting shell 2 drives the feeding shell 31 to oscillate left and right, so that the agglomerated powder is shaken and loosened, and falls from the filter holes of the No. 1 filter screen 32, thereby achieving the preliminary dispersion of the agglomerated powder, which is convenient for the subsequent drying and further dispersion of the powder.

[0028] The use method and working principle of the device are as follows: the staff first opens the dust cover 33, pours the spilled powder into the feeding shell 31, the powder is scattered on the top of the No. 1 filter screen 32, and part of the powder falls into the collection shell 2, and then starts the reduction motor 51, and the reduction motor 51 drives the rotating shaft 52 to rotate, and then the rotating shaft 52 drives a group of rotating wheels 54 to rotate, and then the rotating wheel 54 drives the No. 1 transmission belt 55 to rotate, and then the No. 1 transmission belt 55 drives another group of rotating wheels 54 to rotate, so that both groups of cams 53 are rotated, and due to the protruding parts of the two groups of cams 53 The two groups of cams 53 drive the two groups of rollers 56 to move up and down intermittently, so that the two groups of moving rods 57 move up and down alternately, and then drive the collecting shell 2 to vibrate left and right, and the collecting shell 2 vibrates the powder, and the collecting shell 2 drives the feeding shell 31 to vibrate left and right, so that the agglomerated powder is vibrated and loosened, and falls from the filter hole of the first filter screen 32, and the rotating shaft 52 drives the first transmission wheel 58 to rotate, and then the first transmission wheel 58 drives the second transmission belt 59 to rotate, and the second transmission belt 59 drives the second transmission wheel 510 to rotate, so the second transmission wheel 510 drives the first gear 41 to rotate , and then the two groups of No. 1 gears 41 drive the two groups of No. 2 gears 42 to rotate, and further, the two groups of No. 2 gears 42 drive the two groups of rotating tubes 43 to rotate, and the two groups of cylinders 44 extend, driving the two groups of sliding blocks 45 to move, and the two groups of sliding blocks 45 slide inside the two groups of rotating tubes 43, and then the two groups of sliding blocks 45 drive the four groups of racks 46 to move, and the two groups of racks 46 slide inside the rotating tubes 43, and further, the four groups of racks 46 respectively drive the four groups of No. 3 gears 47 to rotate, and then the four groups of No. 3 gears 47 drive the four groups of stirring blades 48 to rotate, and the two groups of rotating tubes 43 are rotating. The four groups of stirring blades 48 are driven to rotate, so that the four groups of stirring blades 48 rotate around the two groups of rotating tubes 43. Since the angles of the four groups of stirring blades 48 are different, when the four groups of No. 3 gears 47 rotate, they respectively drive the four groups of stirring blades 48 to rotate, thereby stirring and breaking up the agglomerated powder inside the collecting shell 2. The three groups of infrared tubes 411 are connected to the power supply, so that the three groups of infrared tubes 411 generate heat and heat the powder inside the collecting shell 2, thereby accelerating the evaporation of water between the powders, and then the powder with smaller particles leaks out from the two groups of No. 2 filters 410 and flows out from the two groups of discharge pipes 49.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A powder coating collecting device, comprising a moving shell (1), characterized in that: A collecting shell (2) is arranged on the top of the moving shell (1), and a scattering mechanism (4) is arranged inside the collecting shell (2), and the scattering mechanism (4) comprises a first gear (41), and two groups of second gears (42) are meshed on the outer wall of the first gear (41), and two groups of rotating tubes (43) are arranged through one side of the collecting shell (2), and cylinders (44) are fixedly installed inside the two groups of rotating tubes (43), and sliding blocks (45) are fixedly installed at the output ends of the two groups of cylinders (44), and the two groups of sliding blocks (45) A rack (46) is fixedly installed on one side of each of the four groups of racks (46), a third gear (47) is meshed with the outer wall of each of the four groups of the third gear (47), a stirring blade (48) is fixedly installed on one side of each of the four groups of the third gear (47), two groups of discharge pipes (49) are installed through the bottom of the collection shell (2), a second filter screen (410) is fixedly installed at one end of each of the two groups of the discharge pipes (49), three groups of infrared tubes (411) are fixedly installed on the inner wall of the collection shell (2), and four groups of moving wheels (6) are fixedly installed on the bottom of the moving shell (1).

2. A powder coating collecting device according to claim 1, characterized in that: A feeding mechanism (3) is arranged on the top of the collecting shell (2), the feeding mechanism (3) comprising a feeding shell (31), a No. 1 filter screen (32) is fixedly mounted on the bottom of the feeding shell (31), and a dust cover (33) is arranged on the top of the feeding shell (31).

3. A powder coating collecting device according to claim 1, characterized in that: An oscillating mechanism (5) is arranged inside the movable shell (1), the oscillating mechanism (5) comprising a reduction motor (51), the output end of the reduction motor (51) being transmission-connected to a rotating shaft (52), two groups of cams (53) are arranged inside the movable shell (1), a rotating wheel (54) is fixedly mounted on one side of the two groups of cams (53), and the outer walls of the two groups of rotating wheels (54) are transmission-connected to a first transmission belt (55).

4. A powder coating collecting device according to claim 3, characterized in that: Rollers (56) are provided above the two groups of cams (53); the tops of the two groups of rollers (56) are rotatably connected to moving rods (57); one end of the two groups of moving rods (57) penetrates the inner wall of the moving shell (1); and the tops of the two groups of moving rods (57) are rotatably connected to the bottom of the collection shell (2).

5. A powder coating collecting device according to claim 3, characterized in that: A first transmission wheel (58) is fixedly mounted on one end of the rotating shaft (52); a second transmission belt (59) is disposed on the outer wall of the first transmission wheel (58); a second transmission wheel (510) is disposed on one end of the second transmission belt (59); and one side of the second transmission wheel (510) is fixedly connected to one side of the first gear (41).

6. A powder coating collecting device according to claim 3, characterized in that: The outer wall of the reduction motor (51) is fixedly connected to the inner wall of the moving shell (1), and one end of the rotating shaft (52) is installed through the inside of a set of cams (53).

7. A powder coating collecting device according to claim 2, characterized in that: The bottom of the feeding shell (31) is fixedly connected to the top of the collecting shell (2), and the bottom of the No. 1 filter screen (32) is in contact with the top of the collecting shell (2).

8. A powder coating collecting device according to claim 1, characterized in that: One side of the first gear (41) is rotatably connected to one side of the collection shell (2), and the two sets of second gears (42) are both arranged on one side of the collection shell (2).

9. A powder coating collecting device according to claim 1, characterized in that: One end of the two sets of rotating tubes (43) is respectively installed through the inside of the two sets of second gears (42), and the outer walls of the two sets of sliding blocks (45) are respectively slidably connected to the inner walls of the two sets of rotating tubes (43).

10. A powder coating collecting device according to claim 1, characterized in that: One side of the four groups of stirring blades (48) penetrates through the outer walls of the two groups of rotating tubes (43) respectively, and the bottoms of the two groups of second filter screens (410) are fixedly connected to the inner wall of the collection shell (2).

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