PH12018000318A1

PH12018000318A1 - Shop primer line

Info

Publication number: PH12018000318A1
Application number: PH12018000318A
Authority: PH
Inventors: Yoshinobu Ando
Original assignee: Sintokogio Ltd
Priority date: 2017-10-26
Filing date: 2018-10-24
Publication date: 2019-05-15
Also published as: CN109701797B; KR20190046662A; JP2019077015A; JP6939413B2; CN109701797A; TW201922425A

Abstract

In a shop primer line of the present invention, a conveying mechanism conveys the longitudinal material W in such a position that the web Wa is upstanding and the flange Wf is at the bottom. First blasters project shot media toward a surface facing away from the web of the flange Wf of the longitudinal material W, and second and third blasters project shot media toward the web Wa and a web-side surface Wfl of the flange Wf of the longitudinal material W. The second blasters 32 project shot media in the direction perpendicular to the conveyed direction X of the longitudinal material W when viewed in a plan view, and the third blasters are located on the upstream side from the second blasters and project shot media in a widthwise-inward direction that is oblique to the downstream side when viewed in a plan view.

Description

According to the present invention in a configuration described above, - the speeds of conveying the longitudinal material of the conveying o mechanism for the shot blasting unit, the conveying mechanism for the - coating unit, and the conveying mechanism for the drying unit do not vary, a damage on the longitudinal material caused by a variation in conveying ~ speeds can be prevented. © =o

Preferably, the present invention further includes: a leading edge BN portion detecting sensor located on the upstream side of the shot blasting & unit and configured to sense a leading edge portion of the longitudinal ~ material passing in the conveyed direction and output a sense signal; a - driving roller conveyor for the shot blasting unit provided with a plurality of rotatably driven driving rollers; a gear made of a magnetic material fixed to any one driving roller of the plurality of the driving rollers; a proximity switch located on a side of a circumference of the gear and configured to detect proximity of a tooth tip of the gear when the gear rotates and output a detection signal; and a control unit configured to cause the first, second, and third blasters to start projecting the shot media after the sense signal is input from the leading edge portion detecting sensor and when a number of detection signals input from the proximity switch reaches a first predetermined number that is defined in advance and to cause the first, second, and third blasters to stop projecting the shot media after the sense signal is input from the leading edge portion detecting sensor and when the number of detection signals input from the proximity switch reaches a second predetermined number that is defined larger than the first predetermined number.

According to the present invention in a configuration described above, the leading edge portion detecting sensor located on the upstream side of the shot blasting unit senses the leading edge portion of the longitudinal material passing in the conveyed direction and outputs a sense signal. The = driving roller conveyor for the shot blasting unit is provided with a plurality n of rotatably driven driving rollers, and a gear is fixed to any one driving » roller of the plurality of the driving rollers. Further, the proximity switch is - located on the side of the circumference of the gear and the proximity switch - detects proximity of a tooth tip of the gear when the gear rotates and outputs a detection signal. »

Here, after the sense signal is input to the control unit from the = leading edge portion detecting sensor and when the number of detection - signals input from the proximity switch reaches the first predetermined number that is defined in advance, the control unit controls the first, second, and third blasters to start projecting the shot media. Further, after the sense signal is input to the control unit from the leading edge portion detecting sensor and when the number of detection signals input to the control unit from the proximity switch reaches the second predetermined number that is defined larger than the first predetermined number, the control unit controls the first, second, and third blasters to stop projecting the shot media. Accordingly, according to the present invention, the shot media can be projected toward the longitudinal material at a desired timing depending on the settings of the first and second predetermined numbers, so that a wasteful projection of the shot media can be reduced.

Preferably, the present invention further includes: a leading edge 256 portion detecting sensor located on the upstream side of the shot blasting unit and configured to sense a leading edge portion of the longitudinal material passing in the conveyed direction and output a sense signal; a driving roller conveyor for the coating unit provided with a plurality of rotatably driven driving rollers; a gear made of a magnetic material fixed to any one driving roller of the plurality of the driving rollers; a proximity switch located on a side of a circumference of the gear and configured to 2 detect proximity of a tooth tip of the gear when the gear rotates and output a detection signal; and a control unit configured to cause the coating unit to - start applying a coating to the longitudinal material after the sense signal is = input from the leading edge portion detecting sensor and when a number of = detection signals input from the proximity switch reaches a first = predetermined number that is defined in advance and to cause the coating = unit to stop applying a coating to the longitudinal material after the sense " signal is input from the leading edge portion detecting sensor and when the = number of detection signals input from the proximity switch reaches a = second predetermined number that is defined larger than the first = predetermined number.

According to the configuration described above, the leading edge portion detecting sensor located on the upstream side of the shot blasting unit senses the leading edge portion of the longitudinal material passing in the conveyed direction and outputs a sense signal. The driving roller conveyor for the coating unit is provided with a plurality of rotatably driven driving rollers, and a gear made of a magnetic material is fixed to any one driving roller of the plurality of the driving rollers. Further, the proximity switch is located on the side of the circumference of the gear and the proximity switch detects proximity of a tooth tip of the gear when the gear rotates and outputs a detection signal.

Here, after the sense signal is input to the control unit from the leading edge portion detecting sensor and when the number of detection signals input to the control unit from the proximity switch reaches the first predetermined number that is defined in advance, the control unit controls the coating unit to start applying a coating to the longitudinal material.

Further, after the sense signal is input to the control unit from the leading edge portion detecting sensor and when the number of detection signals = input to the control unit from the proximity switch reaches the second on predetermined number that is defined larger than the first predetermined » number, the control unit controls the coating unit to stop applying a coating = to the longitudinal material. Accordingly, according to the present - invention, the longitudinal material can be coated at a desired timing = depending on the settings of the first and second predetermined numbers, so that a waste of paint can be reduced.

The shop primer line of the present invention can provide an = excellent effect of reduction in shot media remaining on a longitudinal material being made possible.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view illustrating a shop primer line according to an embodiment of the present invention;

FIG. 2A is a plan view illustrating a shot blasting unit of a shop primer line according to an embodiment of the present invention;

FIG. 2B illustrates a gear and a proximity switch;

FIG. 3 is a simplified plan view illustrating a part of a shot blasting unit of a shop primer line according to an embodiment of the present invention;

FIG. 4 is a front view illustrating a shot blasting unit of a shop primer line according to an embodiment of the present invention;

FIG. 5 is an enlarged front view illustrating a shot blasting unit performing shot blasting;

FIG. 6A is a front view illustrating anti-tip members and other parts of a shot blasting unit in an enlarged manner;

FIG. 6B is a side view illustrating anti-tip members and other parts of a shot blasting unit; -

FIG. 7A illustrates in a plan view the arrangement of blow units of a - shot blasting unit; =

FIG. 7B is an enlarged view of FIG. 7A taken along a line 7B-7B; ~

FIG. 7C is an enlarged view of FIG. 7A taken along a line 7C-7C; -

FIG. 8 is a plan view illustrating a coating unit and a drying unit of a : shop primer line according to an embodiment of the present invention; .

FIG. 9 is a plan view illustrating spray nozzles and other parts of a - coating unit; and 5

FIG. 10 is an enlarged side view illustrating a drying unit. =

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A shop primer line according to an embodiment of the present invention will now be described with reference to FIGS. 1 to 10. In the figures, an arrow FR indicates the front side of a unit when viewed in front view, an arrow UP indicates the upside of the unit, and an arrow LH indicates the left side of the unit when viewed in front view. An object to be subjected to processing such as shot blasting and coating in the shop primer line according to the embodiment is a lengthy T-shaped sectional longitudinal material W made of metal (for example, steel). As illustrated in FIG. 5, the longitudinal material W has a web Wa with a flange Wf formed on one edge of the web Wa. (Shop Primer Line)

First, the configuration of the entire shop primer line will be described with reference to FIG. 1. The shop primer line 10 has a conveying mechanism 12. The conveying mechanism 12 is configured to convey the longitudinal material W along a conveyance line in such a position that the web Wa is upstanding and the flange Wf is at the bottom. An arrow X os indicates the direction of the longitudinal material W conveyed by the ~ conveying mechanism 12. i >

The shop primer line 10 further has a shot blasting unit 14, a coating = unit 16, and a drying unit 18. The shot blasting unit 14, the coating unit 16, = and the drying unit 18 are all located along the conveyance line. The shot = blasting unit 14 is a unit for projecting shot media toward the longitudinal y material W. The coating unit 16 is located on the conveyance downstream - side with respect to the shot blasting unit 14 and is a unit for applying a = coating to the longitudinal material W. Further, the drying unit 18 is located on the conveyance downstream side with respect to the coating unit 16 and is a unit for drying the longitudinal material W.

In the embodiment, a loading roller conveyor 13, which is a part of the conveying mechanism 12, is provided on the upstream side (the upstream side along the conveyed direction) from the shot blasting unit 14, and an unloading roller conveyor 19, which is a part of the conveying mechanism 12, is provided on the downstream side (the downstream side along the conveyed direction) from the drying unit 18.

In the following, the components of the shop primer line 10 will be described. (Shot Blasting Unit)

First, the shot blasting unit 14 will be described. The shot blasting unit 14 includes a box-shaped cabinet 20. The interior of the cabinet 20 is formed as a long process chamber in the conveyed direction of the longitudinal material W (in the direction of the arrow X), and shot blasting is performed by projecting shot media in a part of the process chamber. In the cabinet 20, a loading entrance is formed on the upstream side of the longitudinal material W (the right side in the figure), and an unloading exit = is formed on the downstream side of the longitudinal material W (the left side in the figure). »

A driving roller conveyor 24 for the shot blasting unit, which is a part - of the conveying mechanism 12, is provided on the conveyance line of the = shot blasting unit 14. The driving roller conveyor 24 is provided in the ° cabinet 20 and conveys the longitudinal material W. In FIG. 1, the driving oe roller conveyor 24 is illustrated with the lower part of the cabinet 20 being = transparent. As illustrated in FIG. 2A, in the driving roller conveyor 24, a = plurality of driving rollers 24B are supported in a rotatably driven manner e on conveyor bases 24A located on opposite sides in the widthwise direction (the direction perpendicular to the conveyed direction when viewed in a plan view). An arrow Y indicates the widthwise direction.

As illustrated in FIG. 1, the plurality of driving rollers 24B are spaced from each other along the conveyed direction (in the direction of the arrow X) and connected to a driving motor M1 via a known driving force transmission mechanism (not shown), and rotationally driven by the driving force of the driving motor M1. In other words, the longitudinal material W is carried and conveyed on the driving rollers 24B. The driving motor M1 is connected with a control unit 26, and the actuation of the driving motor M1 is controlled by the control unit 26.

The control unit 26 has, for example, a storage unit and a processing unit. The processing unit includes a CPU, a memory, a storage section, and a communication interface (I/F) section, which are connected with each other via a bus and the storage section has various control processing programs stored thereon. The storage unit and a processing unit are capable of communicating with each other through the mutual communication interface (I/F) sections. In the shop primer line 10, programs stored on the = storage section in the processing unit of the control unit 26 are executed in on response to the operation on an operation panel (not shown) by an operator. -

As illustrated in FIGS. 3 and 6, anti-tip members 28 for preventing = the longitudinal material W from tipping over are located on opposite sides of = the conveyance line. The anti-tip members 28, which are of a round bar type, are adjacent to the sides of the web Wa of the longitudinal material W and extend along the conveyed direction X of the longitudinal material W. =

As illustrated in FIGS. 3 and 6, the anti-tip members 28 are supported by - supports 29B located on the side of side walls 20S of the cabinet 20 via connecting members 29A extending in the widthwise direction Y.

As illustrated in FIGS. 3 to 5, the shot blasting unit 14 includes first blasters 30, second blasters 32, and third blasters 34.

All of the first blasters 30, the second blasters 32, and the third blasters 84 are centrifugal blasters and located on opposite sides of the conveyance line. The blasters 30, 32 and 34 each include a rotatable impeller (not shown), and the impeller is rotated to exert a centrifugal force on the shot media. Further, the blasters 30, 32 and 34 project the shot media toward the conveyance line side with the shot media being accelerated by the centrifugal force as the impeller is rotated. The shot media projected from the blasters 30, 32 and 34 diverges and hits the longitudinal material

W (see long dashed double-short dashed lines in FIGS. 3 and 5).

As illustrated in FIGS. 1 and 4, the blasters 30, 32 and 34 are each connected with a shot flow regulating unit 36. The shot flow regulating unit 36 is a unit for supplying the shot media to the blasters 30, 32 and 34, and includes a gate (not shown) that can be opened and closed at a supply section of the shot media. The shot flow regulating unit 36 can regulate the = amount of supply of the shot media to the blasters 30, 32 and 34 by changing on the opening of the gate.

The blasters 30, 32 and 34 are also connected with a circulation unit - 38 via the shot flow regulating unit 36. The circulation unit 38 is a unit for © conveying and circulating the shot media projected from the blasters 30, 32 y and 34 back to the blasters 30, 32 and 34, and includes a hopper 38H (see ~

FIG. 4) for recovering the shot media on the lower side of the driving roller = conveyor 24. As illustrated in FIG. 4, a screw conveyor 38A for recovering = the shot media is provided on the lower end side of the hopper 38H. on

As illustrated in FIG. 1, the screw conveyor 38A extends along the conveyed direction (in the direction of the arrow X) of the longitudinal material W, and a shaft thereof is rotatably supported on the side of the cabinet 20 (not shown). The screw conveyor 38A rotates around the axis by being driven by a motor to convey the shot media toward a longitudinally center portion thereof. A lower screw conveyor 38B is located directly below the longitudinally center portion of the screw conveyor 38A. The lower screw conveyor 38B extends with its axis lying in the direction perpendicular to the conveyed direction (in the direction of the arrow X) of the longitudinal material W when viewed in a plan view, and a shaft thereof is rotatably supported on the side of the cabinet 20 (not shown). The lower screw conveyor 38B rotates around the axis by being driven by a motor to convey the shot media fallen from the longitudinally center portion of the screw conveyor 38A to the left side of the unit as illustrated in FIG. 4. The left side end of the lower screw conveyor 38B meets the lower end side of the bucket elevator 38C.

In the bucket elevator 38C, an endless belt (not shown) is wound around pulleys (not shown) arranged on the top and bottom of the bucket - elevator 38C, and a number of buckets (not shown) are attached to the % endless belt. In this way, the bucket elevator 38C scoops up the shot media supplied from the lower screw conveyor 38B, and the shot media in the - buckets is conveyed toward the upside of the unit by rotating the pulleys by a - motor. ©

An upper screw conveyor 38E is connected on the upper end side of - the bucket elevator 38C via a separator 38D and the like. The upper screw @ conveyor 38E is located along the unit transverse direction and conveys the o shot media in the unit transverse direction to supply it to a shot tank 38F.

The shot flow regulating unit 36 is located on the lower end side of the shot tank 38F, and the shot media in the shot tank 38F is supplied to the blasters 30, 32 and 34 when the gate of the shot flow regulating unit 36 is opened.

As illustrated in FIG. 5, the first blasters 30 located on the lower side of the unit project the shot media toward the surface facing away from the web Wf2 of the flange WT of the longitudinal material W, and, as illustrated in FIG. 3, have projecting direction center lines CL1 set along the direction perpendicular to the conveyed direction X of the longitudinal material W when viewed in a plan view. As illustrated in FIG. 5, the second blasters 32 located on the middle portion in the unit vertical direction project the shot media toward the web Wa and the web-side surface Wf1 of the flange Wf of the longitudinal material W, and, as illustrated in FIG. 3, have projecting direction center lines CL2 set along the direction perpendicular to the conveyed direction X of the longitudinal material W when viewed in a plan view. Further, as illustrated in FIG. 5, the third blasters 34 located on the upper side of the unit project the shot media toward the web Wa and the web-side surface Wfl of the flange Wf of the longitudinal material W. As illustrated in FIG. 3, the third blasters 34 are located on the upstream side from the second blasters 32. The third blasters 34 have projecting direction ~ center lines CL3 set widthwise inwardly and obliquely toward the e downstream side when viewed in a plan view. .

Meanwhile, in shot blasting unit 14, the anti-tip members 28 are not = arranged in an area 22 in which the longitudinal material W is - shot-media-projected by the second and third blasters 32 and 34 and are y provided on the upstream and downstream sides of the area 22 in a separate - manner. As illustrated in FIG. 6B, three anti-tip members 28 are arranged = vertically near the area 22, whereas only one anti-tip member 28 is arranged o at a location away from the area 22. -

As illustrated in FIG. 2A, a leading edge portion detecting sensor 40 is located on the upstream side (loading side) of the shot blasting unit 14.

The leading edge portion detecting sensor 40 includes a photoelectric switch, and is provided with a light emitting section 40A located on one side in the widthwise direction Y and a light receiving section 40B located on the other side in the widthwise direction Y. The leading edge portion detecting sensor 40 is connected to the control unit 26, and senses the leading edge portion of the longitudinal material W passing in the conveyed direction and outputs a sense signal to the control unit 26.

As illustrated in FIG. 2, a gear 42 (see FIG. 2B) consisting of a magnetic material is fixed to an axial end of any one driving roller 24B (driving roller 24B1 on the downstream side in the embodiment as an example) of the plurality of the driving rollers 24B coaxially with respect to the driving roller 24B (24B1). As illustrated in FIG. 2B, a proximity switch 44 is located on the side of the circumference of the gear 42. The proximity switch 44 is connected to the control unit 26 (see FIG. 2A) and detects proximity of a tooth tip 42A of the gear 42 when the gear 42 rotates and outputs a detection signal to the control unit 26. = ot

Here, the control unit 26 illustrated in FIG. 2A controls the first, » second, and third blasters 30, 32 and 34 (see FIG. 3 for all the blasters) to = start projecting the shot media after the sense signal is input from the - leading edge portion detecting sensor 40 and when the number of detection = signals input from the proximity switch 44 reaches a first predetermined » number (N1) that is defined in advance. Further, the control unit 26 re controls the first, second, and third blasters 30, 32 and 34 (see FIG. 3 for all = the blasters) to stop projecting the shot media after the sense signal is input = from the leading edge portion detecting sensor 40 and when the number of detection signals input from the proximity switch 44 reaches a second predetermined number (N2) that is defined larger than the first predetermined number (N1).

As illustrated in FIG. 7, the shot blasting unit 14 includes blow units 46 that include elongated blowing ports 46A, 46B and 46C. The blowing ports 464A, 46B and 46C of the blow units 46 are arranged on the downstream side from the second blasters 32 (see FIG. 3) on opposite sides of the conveyance line and on the side above the web-side surface Wfl of the flange

Wf of the longitudinal material W. The blow unit 46 includes a blower fan 46D located above the cabinet 20 illustrated in FIG. 1. The blower fan 46D can be actuated by a driving force of a driving motor (not shown) and is connected to a duct 46E illustrated in FIGS. 2A and 7. As illustrated in FIG. 7, nozzle sections 46N1, 46N2 and 46N3 that include blowing ports 46A, 46B and 46C, respectively, are provided on the lower distal end side of the duct 46E. The blow units 46 are capable of blowing a gas from blowing ports 46A, 46B and 46C by being driven by a driving motor toward the longitudinal material W (more specifically, toward any subparts of a portion ranging from the side of the web Wa to the web-side surface Wfl of the flange Wf

(including subparts where the flange Wf intersects the web Wa). = =

As illustrated in FIG. 7A, the blow units 46 have the gas blowing » directions (see arrows fl, f2 and f3) set widthwise inwardly and obliquely - toward the upstream side when viewed in a plan view. In the embodiment, = the gas blowing directions (see arrows f2 and f3) of the blowing ports 46B 0 and 46C located on the downstream side from the blowing ports 46A are . more oblique toward the upstream side than the gas blowing direction (see the arrow f1) of the blowing ports 46A. The driving motor (not shown) of the = blow unit 46 is connected (not shown) to the control unit 26 (see FIG. 1). =

Ia (Coating Unit)

Next, description will be made to the coating unit 16 of the shop primer line 10 illustrated in FIG. 1.

As illustrated in FIG. 1, the coating unit 16 includes a box-shaped cabinet 50. The interior of the cabinet 50 is formed as a process chamber in which a coating is applied. In the cabinet 50, a loading entrance is formed on the upstream side of the longitudinal material W (the right side in the figure), and an unloading exit is formed on the downstream side of the longitudinal material W (the left side in the figure). In addition, as illustrated in FIG. 9, filters 51 for trapping coating mist are provided on opposite side wall sides inside the cabinet 50. Further, in FIG. 9, flows of air in the cabinet 50 are indicated by downward and horizontal arrows.

As illustrated in FIG. 1, the conveyance line of the coating unit 16 is provided with a driving roller conveyor 52 as a conveying mechanism for the coating unit, which is a part of a conveying mechanism 12. The driving roller conveyor 52 is located from a portion on the upstream side from the cabinet 50 into the cabinet 50 to convey the longitudinal material W. As illustrated in FIG. 8, in the driving roller conveyor 52, a plurality of driving < rollers 52B are supported in a rotatably driven manner on conveyor bases on 52A located on opposite sides in the widthwise direction. In FIG. 8, a part of » the driving roller conveyor 52 is illustrated with a part of a ceiling section of - the cabinet 50 being transparent. Further, in FIG. 8, a number of knurls - are formed on the circumferential surface of the driving roller conveyor 52. ©

The plurality of driving rollers 52B illustrated in FIG. 1 are spaced from each other along the conveyed direction (in the direction of the arrow X) = and connected to a driving motor M2 via a known driving force transmission = mechanism, and rotationally driven by the driving force of the driving motor .

M2. In other words, the longitudinal material W is carried and conveyed on the driving rollers 52B. The driving motor M2 is connected with a control unit 26, and the actuation of the driving motor M2 is controlled by the control unit 26.

As illustrated in FIG. 9, the coating unit 16 includes a first spray nozzle 54 for spraying a paint toward the surface facing away from the web

Wi12 of the flange Wf of the longitudinal material W, and second spray nozzles 56 for spraying a paint toward the web Wa and the web-side surface

Wf1 of the flange Wf of the longitudinal material W. The second spray nozzles 56 are located on opposite sides of the conveyance line. It should be noted that the coating applied by the coating unit 16 of the embodiment is a coating intended for temporary rust protection and a paint used for the coating is generally referred to as a shop primer.

The first spray nozzle 54 is connected to a paint tank 53B (shown in blocks) via a tube (not shown) and a paint supply mechanism 53A. The paint supply mechanism 53A, which is for supplying a paint in the paint tank 53B to the first spray nozzle 54, pressurizes and sends the liquid paint to the first spray nozzle 54 through the tube. ~

A traversing mechanism 58 is located on the side of a base end of the . first spray nozzle 54. The traversing mechanism 58 includes a guide 58A - extending in the widthwise direction Y and a slider 58B movable along the ~ guide 58A in the widthwise direction Y. The first spray nozzle 54 is fixed to 0 the slider 58B on the side of the base end. The slider 58B is fixed to a . predetermined portion of an endless belt 58C (for example, a portion located - on the upper side in the figure). The endless belt 58C is wound around both - a driving pulley 58D and a driven pulley 58E that are arranged in the - widthwise direction of the unit. The driving pulley 58D receives the driving + force from the driving motor 58M (shown in blocks in the figure). With the driving force applied from the driving motor 58M to the driving pulley 58D, the slider 58B fixed to the first spray nozzle 54 on the side of the base end is moved along the guide 58A in the widthwise direction Y. In other words, the traversing mechanism 58 moves the first spray nozzle 54 in the widthwise direction Y. The driving motor 58M of the traversing mechanism 58 is connected to the control unit 26 and its actuation is controlled by the control unit 26.

The second spray nozzles 56 are connected to paint tanks 55B via tubes (not shown) and paint supply mechanisms 55A. The paint supply mechanisms 55A, which are for supplying a paint in the paint tanks 55B to the second spray nozzles 56, pressurizes and sends the liquid paint to the second spray nozzles 56 through the tubes.

An elevating mechanism 60 is located on the side of a base end of each of the second spray nozzles 56. The elevating mechanism 60 includes a guide 60A extending in the vertical direction of the unit and a slider 60B movable along the guide 60A in the vertical direction of the unit. The second spray nozzle 56 is fixed to the slider 60B on the side of the base end. ~

The slider 60B is fixed to a predetermined portion of an endless belt 60C (for o example, a portion located widthwise inwardly in the figure). The endless » belt 60C is wound around both a driving pulley 60D and a driven pulley 60E o that are arranged in the vertical direction of the unit. The driving pulley - 60D receives the driving force from the driving motor 60M. With the © driving force applied from the driving motor 60M to the driving pulley 60D, . the slider 60B fixed to the second spray nozzle 56 on the side of the base end - is moved up and down along the guide 60A in the vertical direction of the = unit. In other words, the elevating mechanism 60 moves up and down the = second spray nozzle 56 in the vertical direction of the unit (see the arrow Z).

A height detection sensor 62 illustrated in FIG. 1 is located on the upstream side from the second spray nozzles 56. The height detection sensor 62 includes a phototube located on one side in the widthwise direction with its longitudinal axis lying in the vertical direction of the unit and a light source located on the other side in the widthwise direction, and used as a sensor for detecting the height of the longitudinal material W illustrated in

FIG. 9 while it is conveyed. As illustrated in FIG. 1, the height detection sensor 62 is connected to the control unit 26 and outputs the result of detection to the control unit 26. Further, as illustrated in FIG. 9, the driving motor 60M of the elevating mechanism 60 is connected to the control unit 26 as its control section and the control unit 26 controls the actuation of the driving motor 60M. The control unit 26 adjusts elevating ranges of the second spray nozzles 56 moved by the elevating mechanisms 60 depending on the result of detection from the height detection sensor 62 (see FIG. 1).

Meanwhile, a gear 64 consisting of a magnetic material is fixed to an axial end of any one driving roller 52B (driving roller 52B1 partially enlarged in the embodiment as an example) of the plurality of the driving rollers 52B illustrated in FIG. 8 coaxially with respect to the driving roller 52B1. A - proximity switch 66 is located on the side of the circumference of the gear 64. ot

The positional relation between the gear 64 and the proximity switch 66 is similar to that between the gear 42 and the proximity switch 44 illustrated ~ in FIG. 2B. The proximity switch 66 illustrated in FIG. 8, which is ~ connected to the control unit 26, detects proximity of a tooth tip of the gear 0 64 when the gear 64 rotates and outputs a detection signal to the control unit feo 25 ;

Here, the control unit 26 illustrated in FIG. 9 controls the paint = supply mechanisms 53A and 55A, causing the coating unit 16 to start - applying a coating to longitudinal material W after the sense signal is input from the leading edge portion detecting sensor 40 (see FIG. 2) and when the number of detection signals input from the proximity switch 66 (see FIG. 8) reaches a first predetermined number (N1) that is defined in advance.

Further, the control unit 26 controls the paint supply mechanisms 53A and 55A, causing the coating unit 16 to stop applying a coating to longitudinal material W after the sense signal is input from the leading edge portion detecting sensor 40 (see FIG. 2) and when the number of detection signals input from the proximity switch 66 (see FIG. 8) reaches a second predetermined number (N2) that is defined larger than the first predetermined number (N1).

As illustrated in FIGS. 1, 8 and 9, a plurality of ducts D1, D2 and D3 are connected to the ceiling section of the cabinet 50. The duct D3 is connected to the duct D2, and the duct D2 is connected to the duct D1. As illustrated in FIG. 9, an axial fan 68A for intake is provided in the duct D1, and an axial fan 68B for exhaust is provided in the duct D2. The axial fans 68A and 68B are schematically illustrated with the ducts D1 and D2 being transparent.

fo (Drying Unit)

Next, description will be made to the drying unit 18 of the shop = primer line 10 illustrated in FIG. 1 with reference to FIGS. 8 and 10. ~

As illustrated in FIGS. 8 and 10, the drying unit 18 includes a © box-shaped cabinet 70. The interior of the cabinet 70 is formed as a process - chamber in which a drying process is performed. In the cabinet 70, a ~ loading entrance is formed on the upstream side of the longitudinal material ©

W (the right side in the figure), and an unloading exit is formed on the . downstream side of the longitudinal material W (the left side in the figure). -

The conveyance line of the drying unit 18 is provided with a chain conveyor 72 as a conveying mechanism for the drying unit, which is a part of a conveying mechanism 12. As illustrated in FIG. 10, the chain conveyor 72 is provided with a rotationally driven endless chain 72C. The chain 72C is wound around both a sprocket 72A located on the loading side and a sprocket 72B located on the unloading side, stretching in the conveyed direction X of the longitudinal material W. The sprocket 72B located on the unloading side is connected to a driving motor M3 via a driving force transmission mechanism 72T to be able to rotate continuously. As illustrated in FIG. 1, the driving motor M3 is connected with a control unit 26, and the actuation of the driving motor M3 is controlled by the control unit 26.

As illustrated in FIG. 10, a plurality of receiving parts 72D are fixed to the chain 72C. Note that in FIG. 10, the plurality of receiving parts 72D are partially, not entirely, illustrated for convenience. The receiving parts 72D are located on the circumferential side of the chain 72C and provided in a standing manner with respect to the chain 72C when viewed in side view as illustrated in FIG. 10. As illustrated in FIG. 10 in a partial enlarged view, the receiving parts 72D include a base plate section 72D1 extending in = the widthwise direction (the direction perpendicular to the plane of FIG. 10) - in a standing manner with respect to the chain 72C, and are provided with = leading-edge-side receiving pieces 72D2 of a semicircular column shape ~ formed on the leading edge side of the base plate section 72D1 extending in _ the widthwise direction (the direction perpendicular to the plane of FIG. 10). 0

In a receiving part 72D, a semicircular curved surface portion of a - leading-edge-side receiving piece 72D2 is configured to face away from the Bh side of the chain 72C when viewed in side view as illustrated in FIG. 10. In > this way, the receiving parts 72D support the longitudinal material W in a n line contact manner. -

As a variation of the embodiment, instead of the receiving parts 72D, an alternative receiving part that includes an angled or triangular prism shaped portion (receiving piece) extending in the widthwise direction with its leading edge side arranged to direct a corner facing away from the side of the chain 72C may be applied such that the receiving part supports the longitudinal material W in a line contact manner.

As described above, the driving motors M1, M2 and M3 illustrated in

FIG. 1 are connected to the control unit 26. Then, the speeds of conveying the longitudinal material W of the driving roller conveyor 24 provided on the conveyance line of the shot blasting unit 14, the driving roller conveyor 52 provided on the conveyance line of the coating unit 16, and the chain conveyor 72 provided on the conveyance line of the drying unit 18 are set at the same speed as each other by an inverter control.

As illustrated in FIG. 8, a burner 74 is provided in the cabinet 70 of the drying unit 18. The burner 74 is configured to generate and supply hot air for drying to the side of the longitudinal material W on the chain conveyor 72. In other words, the drying unit 18 may be, for example, a unit - for drying a coating on the surfaces of the longitudinal material W by hot air ge generated by the burner 74. »

A duct D4 is connected to the ceiling section of the cabinet 70. The = duct D4 is connected to the duct D1. An axial fan 76 is provided in the duct =

D4 for exhaust. . [Operation and Effects of Embodiment] =

The operation and effects of the embodiment will now be described. =

As illustrated in FIG. 1, the conveying mechanism 12 conveys the longitudinal material W along the conveyance line in such a position that the web Wa is upstanding and the flange Wf is at the bottom. The conveyance line is provided with the shot blasting unit 14, the coating unit 16, and the drying unit 18. The shot blasting unit 14 projects the shot media toward the longitudinal material W. The coating unit 16 located on the downstream side with respect to the shot blasting unit 14 applies a coating to the shot-media-projected longitudinal material W. The drying unit 18 located on the downstream side with respect to the coating unit 16 dries the coated longitudinal material W. Here, in the embodiment, the longitudinal material W is subjected to coating while it is conveyed in the position described above. Accordingly, uneven coating is less likely to occur than the case in which the longitudinal material is carried and subjected to coating in such a position that a leading edge of the web and either one of right or left edge of the flange of the longitudinal material are supported on the side of a conveying mechanism.

As illustrated in FIGS. 3 and 5, the shot blasting unit 14 includes the first blasters 30, the second blasters 32, and the third blasters 34, which are

SHOP PRIMER LINE - [So

BACKGROUND OF THE INVENTION ho

Field of the Invention -

The present invention relates to a shop primer line. =

Fol

Description of the Related Art

A shop primer line has been known, which is a processing line that, © while a T-shaped sectional longitudinal material is conveyed along the o longitudinal direction, projects shot media toward the longitudinal material for shot blasting and then apply a coating to the processed surface for temporary rust protection (for example, see Japanese Patént Laid-Open No. 2001-38628).

From a machining point of view, it is not preferable to leave projected shot media on the longitudinal material.

An object of the present invention is to provide a shop primer line with which shot media remaining on a longitudinal material can be reduced.

SUMMARY OF THE INVENTION

To attain the above object, the present invention is a shop primer line for processing a T-shaped sectional metal longitudinal material provided with a flange on one edge of a web, including: a conveying mechanism configured to convey the longitudinal material along a conveyance line in such a position that the web is upstanding and the flange is at the bottom; a shot blasting unit located on the conveyance line and configured to project located on opposite sides of the conveyance line, respectively. As illustrated ol in FIG. 5, the first blasters 30 project the shot media toward the surface facing away from the web Wf2 of the flange Wf of the longitudinal material W, = and, as illustrated in FIG. 3, have projecting direction center lines CL1 set - along the direction perpendicular to the conveyed direction X of the - longitudinal material W when viewed in a plan view. As illustrated in FIG. 5, the second blasters 32 project the shot media toward the web Wa and the - web-side surface Wf1 of the flange Wf of the longitudinal material W, and, as - illustrated in FIG. 3, have projecting direction center lines CL2 set along the = direction perpendicular to the conveyed direction X of the longitudinal - material W when viewed in a plan view.

Meanwhile, as illustrated in FIG. 5, the third blasters 34 project the shot media toward the web Wa and the web-side surface Wfl of the flange Wf of the longitudinal material W, and, as illustrated in FIG. 3, are located on the upstream side from the second blasters 32 and have projecting direction center lines CL3 set widthwise inwardly and obliquely toward the downstream side when viewed in a plan view. Accordingly, upon collision with the longitudinal material W, the shot media projected from the third blasters 34 is basically reflected widthwise outwardly and obliquely toward the downstream side and falls widthwise outwardly from the web-side surface Wf1 of the flange Wf of the longitudinal material W. In this way, the shot media remaining on the web-side surface Wfl of the flange Wf of the longitudinal material W is suppressed.

Upon collision with the longitudinal material W, the shot media projected from the second blasters 32 basically tends to flow toward the upstream and downstream sides. However, the shot media tending to flow toward the upstream side falls widthwise outwardly from the web-side surface Wfl of the flange Wf of the longitudinal material W in such a manner that it is caught in the shot media that is discharged from the third blasters - 34 and tends to be reflected widthwise outwardly and obliquely toward the on downstream side. As a result of such an effect, the shot media remaining on » the web-side surface Wf1 of the flange Wf of the longitudinal material W can - also be suppressed. = ©

As illustrated in FIG. 7, the shot blasting unit 14 includes the blow units 46, and the blow units 46 are capable of blowing a gas from blowing ports 46A, 46B and 46C toward the longitudinal material W, the blowing = ports 46A, 46B and 46C being arranged on the downstream side from the o second blasters 32 (see FIG. 3) on opposite sides of the conveyance line and on the side above the web-side surface Wfl of the flange Wf of the longitudinal material W. In this way, the shot media remaining on the longitudinal material W can be blown off by blowing a gas. As a result, uneven coating can be reduced when a coating is applied in the subsequent coating process.

Further, in the embodiment, the blow units 46 have the gas blowing directions set widthwise inwardly and obliquely toward the upstream side when viewed in a plan view. Accordingly, the shot media that remains on the web-side surface Wf1 of the flange Wf of the longitudinal material W and tends to move to the downstream side can efficiently be blown off by a gas blown against the moving direction of the media. In addition, since the gas blowing direction includes widthwise-inward vector components when viewed in a plan view, the shot media remaining on the flange Wf near the border with the web Wa can effectively be blown off.

As described above, according to the shop primer line 10 illustrated in FIG. 1 of the embodiment, the shot media remaining on the longitudinal material W can be reduced.

In the embodiment, as illustrated in FIG. 6, the anti-tip members 28 located on opposite sides of the conveyance line are configured to be adjacent = to the sides of the web Wa of the longitudinal material W and extend along = the conveyed direction X of the longitudinal material W, preventing the _ longitudinal material W from tipping over. © os

In the embodiment, as illustrated in FIG. 3, the anti-tip members 28 ~ of the shot blasting unit 14 are not arranged in an area 22 in which the ® longitudinal material W is shot-media-projected by the second and third - blasters 32 and 34 and are provided on the upstream and downstream sides hb of the area 22 in a separate manner. In this way, the anti-tip members 28 are not arranged in the area 22 in which the longitudinal material W is shot-media-projected by the second and third blasters 32 and 34, and thus the shot media can effectively be projected toward the longitudinal material

W. In addition, the anti-tip members 28 are provided on the upstream and downstream sides with respect to the area 22 in a separate manner, and thus the longitudinal material W can stably be supported on both one and the other sides in the longitudinal direction as long as the longitudinal material

W has a predetermined length or longer.

In the embodiment, the speeds of conveying the longitudinal material

W of the driving roller conveyor 24 provided on the conveyance line of the shot blasting unit 14 illustrated in FIG. 1, the driving roller conveyor 52 provided on the conveyance line of the coating unit 16, and the chain conveyor 72 provided on the conveyance line of the drying unit 18 are set at the same speed as each other by an inverter control. In other words, the speeds of conveying the longitudinal material W of the driving roller conveyors 24 and 52 and the chain conveyor 72 do not vary. In this way, a damage on the longitudinal material W caused by a variation in conveying speeds can be prevented. ~

In the embodiment, the leading edge portion detecting sensor 40 . located on the loading side of the shot blasting unit 14 illustrated in FIG. 2 senses the leading edge portion of the longitudinal material W passing in the = conveyed direction and outputs a sense signal. The driving roller conveyor o 24 provided on the conveyance line of the shot blasting unit 14 is provided o with a plurality of rotatably driven driving rollers 24B, and a gear 42 consisting of a magnetic material is fixed to an axial end of any one driving = roller 24B1 of the plurality of the driving rollers 24B coaxially therewith. ol

Further, the proximity switch 44 is located on the side of the circumference of - the gear 42 and the proximity switch 44 detects proximity of a tooth tip 42A of the gear 42 when the gear 42 rotates and outputs a detection signal.

Here, the control unit 26 controls the first, second, and third blasters 30, 32 and 34 (see FIG. 3 for all the blasters) to start projecting the shot media after the sense signal is input to the control unit 26 from the leading edge portion detecting sensor 40 and when the number of detection signals input to the control unit 26 from the proximity switch 44 reaches a first predetermined number (N1) that is defined in advance. Further, the control unit 26 controls the first, second, and third blasters 30, 32 and 34 (see FIG. 3 for all the blasters) to stop projecting the blast media after the sense signal is input to the control unit 26 from the leading edge portion detecting sensor 40 and when the number of detection signals input to the control unit 26 from the proximity switch 44 reaches a second predetermined number (N2) that is defined larger than the first predetermined number (N1). Accordingly, the shot media can be projected toward the longitudinal material W at a desired timing depending on the settings of the first predetermined number (N1) and the second predetermined number (N2), so that a wasteful projection of the shot media can be reduced.

In the embodiment, the driving roller conveyor 52 provided on the or conveyance line of the coating unit 16 is provided with a plurality of . rotatably driven driving rollers 52B and a gear 64 consisting of a magnetic ~ material is fixed to an axial end of any one driving roller 52B1 of the = plurality of the driving rollers 52B coaxially therewith. Further, the =o proximity switch 66 is located on the side of the circumference of the gear 64 . and the proximity switch 66 detects proximity of a tooth tip of the gear 64 - when the gear 64 rotates and outputs a detection signal. o =

Here, the control unit 26 controls the coating unit 16 illustrated in -

FIG. 9 to start applying a coating to the longitudinal material W after the sense signal is input to the control unit 26 from the leading edge portion detecting sensor 40 (see FIG. 2) and when the number of detection signals input to the control unit 26 from the proximity switch 66 reaches the first predetermined number (N1) that is defined in advance. Further, the control unit 26 controls the coating unit 16 to stop applying a coating to the longitudinal material W after the sense signal is input to the control unit 26 from the leading edge portion detecting sensor 40 (see FIG. 2) and when the number of detection signals input to the control unit 26 from the proximity switch 66 (see FIG. 8) reaches the second predetermined number (N2) that is defined larger than the first predetermined number (N1). Accordingly, the longitudinal material can be coated at a desired timing depending on the settings of the first predetermined number (N1) and the second predetermined number (N2), so that a waste of paint can be reduced.

In the embodiment, the first spray nozzle 54 of the coating unit 16 illustrated in FIG. 9 sprays a paint toward the surface facing away from the web Wf2 of the flange Wf of the longitudinal material W. The first spray nozzle 54 is then moved by the traversing mechanism 58 in the widthwise direction Y. The second spray nozzles 56 of the coating unit 16 are located - on opposite sides of the conveyance line, and spray a paint toward the web on

Wa and the web-side surface Wfl of the flange Wf of the longitudinal » material W. The second spray nozzles 56 are moved up and down by the = elevating mechanisms 60 in the vertical direction of the unit. Here, the = height detection sensor illustrated in FIG. 1, which is located on the = upstream side from the second spray nozzles 56, detects the height of the = longitudinal material W while it is conveyed, and the control unit 26 adjusts " elevating ranges of the second spray nozzles 56 moved by the elevating = mechanisms 60 illustrated in FIG. 9 depending on the result of detection = from the height detection sensor 62. In this way, the paint sprayed from the second spray nozzles 56 toward the side above the web Wa of the longitudinal material W is reduced, so that a wasteful spray of paint can be reduced.

In the embodiment, as illustrated in FIG. 10, in the chain conveyor 72 as a conveying mechanism for the drying unit, the endless chain 72C is rotationally driven and the plurality of receiving parts 72D fixed to the chain 72C support the longitudinal material W in a line contact manner. In this way, the longitudinal material W after coating is supported in a line contact manner, and thus a damage on a coated portion can be minimized. [Supplementary Description of Embodiment]

There may be provided a reversing machine for reversing the longitudinal material W on the downstream side with respect to the unloading roller conveyor 19 illustrated in FIG. 1. There may also be provided a printing unit for numbering the longitudinal material W on the downstream side of such a reversing machine.

In the embodiment, as illustrated in FIG. 5, the third blasters 34 are located at higher positions than the second blasters 32 in the vertical direction of the unit. However, alternative configurations may be provided; = the third blasters 34 may be located at lower positions than the second blasters 32 in the vertical direction of the unit, and the third blasters 34 and the second blasters 32 may be located at substantially the same level in the = vertical direction of the unit. =

In the embodiment, as illustrated in FIG. 7, the shot blasting unit 14 » includes the blow units 46. Although such configuration is preferable, the shot blasting unit may not include the blow units 46. = °

In the embodiment, the control unit 26 adjusts elevating ranges of = the second spray nozzles 56 moved by the elevating mechanisms 60 illustrated in FIG. 9 depending on the result of detection from the height detection sensor 62 illustrated in FIG. 1. Although such configuration is preferable, a plurality of second spray nozzles 56 may be arranged in the vertical direction of the unit without the elevating mechanisms 60, for example. In a case in which a plurality of second spray nozzles 56 may be arranged in the vertical direction of the unit, the control unit 26 may turn on and off spraying of a paint from upper second spray nozzles (spray nozzles located on an upper part of the plurality of second spray nozzles arranged in the vertical direction of the unit) depending on the result of detection from the height detection sensor 62, for example.

In the embodiment, as illustrated in FIG. 1, the speeds of conveying the longitudinal material W of the driving roller conveyors 24 and 52 and the chain conveyor 72 are set at the same speed as each other by an inverter control. For example, however, the conveying mechanism of the shop primer line may have a structure in which conveyors are not separated into those for the shot blasting unit, the coating unit and the drying unit.

In the embodiment, the control unit 26 illustrated in FIG. 2 controls wo the first, second, and third blasters 30, 32 and 34 illustrated in FIG. 3 to start and stop projecting the shot media based on the sense signal input from = the leading edge portion detecting sensor 40 and the detection signal input from the proximity switch 44. Although such configuration is preferable, = the projecting of the shot media from the first, second, and third blasters 30, Hs 32 and 34 may be started and stopped in response to a manual operation by - an operator, for example. i.

In the embodiment, the control unit 26 illustrated in FIG. 2 controls - the coating unit 16 to start and stop applying a coating to the longitudinal - material W based on the sense signal input from the leading edge portion detecting sensor 40 and the detection signal input from the proximity switch 66 illustrated in FIG. 8. Although such configuration is preferable, the application of a coating to the longitudinal material W by the coating unit 16 may be started and stopped in response to a manual operation by an operator, for example.

The above embodiment and variations described above may be implemented in combination as necessary.

Although examples of the present invention have been described, the present invention is not limited thereto, and various variations may of course be implemented without departing from the spirit and scope of the invention.

Reference Signs List 10 shop primer line 12 conveying mechanism 14 shot blasting unit

16 coating unit ~ 18 drying unit v 22 area 24 driving roller conveyor (conveying mechanism for shot blasting unit) ~ 24B driving roller -

32 second blaster - 34 third blaster = 40 leading edge portion detecting sensor 42 gear 42A tooth tip

44 proximity switch 46 blow unit 46A, 46B, 46C blowing port 52 driving roller conveyor (conveying mechanism for coating unit) 52B driving roller

52B1 any one driving roller 54 first spray nozzle 56 second spray nozzle 58 traversing mechanism 60 elevating mechanism

62 height detection sensor 64 gear 66 proximity switch 72 chain conveyor (conveying mechanism for drying unit) 72C chain

72D receiving part

CL1 projecting direction center line of first blaster

CL2 projecting direction center line of second blaster

CL3 projecting direction center line of third blaster = f1, £2, £3 gas blowing direction -

W longitudinal material ~

Wa web ©

Wf flange -

Wfl web-side surface of flange _

X conveyed direction of longitudinal material i

Y widthwise direction shot media toward the longitudinal material; a coating unit located on a - downstream side of the shot blasting unit on the conveyance line and on configured to apply a coating to the longitudinal material; and a drying unit x located on a downstream side of the coating unit on the conveyance line and ~ configured to dry the longitudinal material, the shot blasting unit including: - first blasters located on opposite sides of the conveyance line, each of the first blasters being configured to project shot media toward a surface facing away . from the web of the flange of the longitudinal material and in a direction - perpendicular to a conveyed direction of the longitudinal material when = viewed in a plan view; second blasters located on opposite sides of the = conveyance line, each of the second blasters being configured to project shot media toward the web and a web-side surface of the flange of the longitudinal material and in a direction perpendicular to the conveyed direction of the longitudinal material when viewed in a plan view; and third blasters located on an upstream side from the second blasters on opposite sides of the conveyance line, each of the third blasters being configured to project shot media toward the web and the web-side surface of the flange of the longitudinal material and in a widthwise-inward direction that is oblique to a downstream side when viewed in a plan view.

According to the present invention configured as described above, the conveying mechanism conveys the longitudinal material along the conveyance line in such a position that the web is upstanding and the flange is at the bottom. The conveyance line is provided with the shot blasting unit, the coating unit, and the drying unit. The shot blasting unit projects the shot media toward the longitudinal material. The coating unit located on the downstream side with respect to the shot blasting unit applies a coating to the shot-media-projected longitudinal material. The drying unit located on the downstream side with respect to the coating unit dries the coated longitudinal material. Here, according to the present invention, the longitudinal material is subjected to coating while it is conveyed in the = position described above. Accordingly, uneven coating is less likely to occur e than the case in which the longitudinal material is carried and subjected to coating in such a position that a leading edge of the web and either one of - right or left edge of the flange of the longitudinal material are supported on - the side of a conveying mechanism.

The shot blasting unit includes the first blasters, the second blasters, and the third blasters, which are located on opposite sides of the conveyance = line, respectively. The first blasters project shot media toward the surface p facing away from the web of the flange of the longitudinal material and in the direction perpendicular to the conveyed direction of the longitudinal material when viewed in a plan view. The second blasters project shot media toward the web and the web-side surface of the flange of the longitudinal material and in the direction perpendicular to the conveyed direction of the longitudinal material when viewed in a plan view.

On the other hand, the third blasters located on the upstream side from the second blasters, each of the third blasters project shot media toward the web and the web-side surface of the flange of the longitudinal material and in the widthwise-inward direction that is oblique to the downstream side when viewed in a plan view. Accordingly, upon collision with the longitudinal material, the shot media projected from the third blasters is basically reflected widthwise outwardly and obliquely toward the downstream side and falls widthwise outwardly from the web-side surface of the flange of the longitudinal material. In this way, the shot media remaining on the web-side surface of the flange of the longitudinal material is suppressed.

Upon collision with the longitudinal material, the shot media discharged from the second blasters basically tends to flow toward the ~ upstream and downstream sides. However, the shot media tending to flow Ne toward the upstream side falls widthwise outwardly from the web-side - surface of the flange of the longitudinal material in such a manner that it is co caught in the shot media that is projected from the third blasters and tends - to be reflected widthwise outwardly and obliquely toward the downstream 0 side. As a result of such an effect, the shot media remaining on the . web-side surface of the flange of the longitudinal material can also be - suppressed. = 0 :

In the present invention, the shot blasting unit preferably includes a > blow unit capable of blowing a gas from blowing ports toward the longitudinal material. The blowing ports of the blow units are arranged on a downstream side from the second blasters on opposite sides of the conveyance line and on the side above the web-side surface of the flange of the longitudinal material.

According to the present invention in a configuration described above, the shot blasting unit includes the blow unit, and the blowing ports of the blow units are arranged on opposite sides of the conveyance line on the downstream side from the second blasters and on the side above the web-side surface of the flange of the longitudinal material. In this way, according to the present invention, the shot media remaining on the longitudinal material can be blown off by blowing a gas.

In the present invention, the blow unit preferably blows a gas in the widthwise-inward direction that is oblique to the upstream side when viewed in a plan view.

According to the present invention in a configuration described above,

the shot media that remains on the longitudinal material and tends to move ~ to the downstream side can efficiently be blown off by a gas blown against or the moving direction of the media. In addition, the gas is blown in the . direction that includes widthwise-inward vector components when viewed in ~ aplan view, and thus the shot media remaining on the flange near the border - with the web can effectively be blown off, © wo

In the present invention, the coating unit preferably includes: a first - spray nozzle configured to spray a paint toward the surface facing away from = the web of the flange of the longitudinal material; a traversing mechanism = configured to move the first spray nozzle widthwise; second spray nozzles - located on opposite sides of the conveyance line, each of the second spray nozzles being configured to spray a paint toward the web and the web-side surface of the flange of the longitudinal material; elevating mechanisms configured to move vertically up and down the second spray nozzles; a height detection sensor located on the upstream side from the second spray nozzles, the height detection sensor being configured to detect a height of the longitudinal material; and a control section configured to adjust elevating ranges of the second spray nozzles moved by the elevating mechanisms depending on the height of the longitudinal material detected by the height detection sensor.

According to the present invention in a configuration described above, the first spray nozzle of the coating unit sprays a paint toward the surface facing away from the web of the flange of the longitudinal material. The first spray nozzle is moved widthwise by the traversing mechanism. In addition, the second spray nozzles of the coating unit are located on opposite sides of the conveyance line, and spray a paint toward the web and the web-side surface of the flange of the longitudinal material. The second spray nozzles are moved vertically up and down by the elevating mechanisms. Here, the height detection sensor located on the upstream o side from the second spray nozzles detects the height of the longitudinal material, and the control section adjusts elevating ranges of the second spray = nozzles moved by the elevating mechanisms depending on the height of the longitudinal material detected by the height detection sensor. In this way, — according to the present invention, the paint sprayed from the second spray Le nozzles toward the side above the web of the longitudinal material is reduced, ~ so that a wasteful spray of paint can be reduced. -

In the present invention, the shot blasting unit preferably includes ~ anti-tip members configured to prevent the longitudinal material from h tipping over, and the anti-tip members are adjacent to sides of the web of the longitudinal member and extend along the conveyed direction of the longitudinal material on opposite sides of the conveyance line.

According to the present invention in a configuration described above, the anti-tip members located on opposite sides of the conveyance line are adjacent to the sides of the web of the longitudinal member and extend along the conveyed direction of the longitudinal material to prevent the longitudinal material from tipping over.

Preferably, in the present invention, the anti-tip members of the shot blasting unit are not arranged in an area in which the longitudinal material is shot-media-projected by the second and third blasters and are provided on the upstream and downstream sides of the area in a separate manner.

According to the present invention in a configuration described above, in the shot blasting unit, the anti-tip members are not arranged in the area in which the longitudinal material is shot-media-projected by the second and third blasters, and thus the shot media can effectively be projected toward the longitudinal material. In addition, the anti-tip members are provided < on the upstream and downstream sides with respect to the area in a separate on manner, and thus the longitudinal material can stably be supported on both = one and the other sides in the longitudinal direction as long as the ~ longitudinal material has a predetermined length or longer. -

In the present invention, the conveying mechanism preferably . includes a chain conveyor for the drying unit provided on the conveyance line ~ of the drying unit, and the chain conveyor includes a rotationally driven 5 endless chain and a plurality of receiving parts fixed to the chain and co configured to support the longitudinal material in a line contact manner. a

According to the present invention in a configuration described above, in the chain conveyor for the drying unit, the endless chain is rotationally driven and the plurality of receiving parts fixed to the chain support the longitudinal material in a line contact manner. In this way, according to the present invention, the longitudinal material after coating is supported in a line contact manner, and thus a damage on a coated portion can be minimized. } 20

In the present invention, the conveying mechanism preferably includes: a conveying mechanism for the shot blasting unit provided on the conveyance line of the shot blasting unit; a conveying mechanism for the coating unit provided on the conveyance line of the coating unit; and a conveying mechanism for the drying unit provided on the conveyance line of the drying unit, and the conveying mechanism for the shot blasting unit, the conveying mechanism for the coating unit, and the conveying mechanism for the drying unit have same conveying speed of the longitudinal material as each other.

Claims

What is claimed is:

1. A shop primer line for processing a T-shaped sectional metal longitudinal material provided with a flange on one edge of a web, comprising: a conveying mechanism configured to convey the longitudinal material along a conveyance line in such a position that the web is upstanding and the flange is at the bottom; a shot blasting unit located on the conveyance line and configured to project shot media toward the longitudinal material; a coating unit located on a downstream side of the shot blasting unit on the conveyance line and configured to apply a coating to the longitudinal material; and a drying unit located on a downstream side of the coating unit on the conveyance line and configured to dry the longitudinal material, the shot blasting unit including: first blasters located on opposite sides of the conveyance line, each of the first blasters being configured to project shot media toward a surface facing away from the web of the flange of the longitudinal material and in a direction perpendicular to a conveyed direction of the longitudinal material when viewed in a plan view; second blasters located on opposite sides of the conveyance line, each of the second blasters being configured to project shot media toward the web and a web-side surface of the flange of the longitudinal material and in a direction perpendicular to the conveyed direction of the longitudinal material when viewed in a plan view; and third blasters located on an upstream side from the second blasters on opposite sides of the conveyance line, each of the third blasters being configured to project shot media toward the web and the web-side surface of the flange of the longitudinal material and in a widthwise-inward direction that is oblique to a downstream side when viewed in a plan view.

2. The shop primer line according to claim 1, wherein the shot blasting unit includes a blow unit capable of blowing a gas from blowing ports toward the longitudinal material, the blowing ports of the blow units are arranged on a downstream side from the second blasters on opposite sides of the conveyance line and on the side above the web-side surface of the flange of the longitudinal material.

3. The shop primer line according to claim 2, wherein the blow unit blows a gas in the widthwise-inward direction that is oblique to the upstream side when viewed in a plan view.

4. The shop primer line according to any one of claims 1 to 3, wherein the coating unit includes: a first spray nozzle configured to spray a paint toward the surface facing away from the web of the flange of the longitudinal material; a traversing mechanism configured to move the first spray nozzle widthwise; second spray nozzles located on opposite sides of the conveyance line, each of the second spray nozzles being configured to spray a paint toward the web and the web-side surface of the flange of the longitudinal material; elevating mechanisms configured to move vertically up and down the second spray nozzles; a height detection sensor located on the upstream side from the second spray nozzles, the height detection sensor being configured to detect a height of the longitudinal material; and a control section configured to adjust elevating ranges of the second spray nozzles moved by the elevating mechanisms depending on the height of the longitudinal material detected by the height detection sensor.

5. The shop primer line according to any one of claims 1 to 4, wherein the shot blasting unit includes anti-tip members configured to prevent the longitudinal material from tipping over and the anti-tip members are adjacent to sides of the web of the longitudinal material and extend along the conveyed direction of the longitudinal material on opposite sides of the conveyance line.

6. The shop primer line according to claim 5, wherein the anti-tip members of the shot blasting unit are not arranged in an area in which the longitudinal material is shot-media-projected by the second and third blasters and are provided on the upstream and downstream sides of the area in a separate manner.

7. The shop primer line according to any one of claims 1 to 6, wherein the conveying mechanism includes a chain conveyor for the drying unit provided on the conveyance line of the drying unit, and the chain conveyor includes a rotationally driven endless chain and a plurality of receiving parts fixed to the chain and configured to support the longitudinal material in a line contact manner.

8. The shop primer line according to any one of claims 1 to 7, wherein the conveying mechanism includes a conveying mechanism for the shot blasting unit provided on the conveyance line of the shot blasting unit; a conveying mechanism for the coating unit provided on the conveyance line of the coating unit; and a conveying mechanism for the drying unit provided on the conveyance line of the drying unit, and the conveying mechanism for the shot blasting unit, the conveying mechanism for the coating unit, and the conveying mechanism for the drying unit have same conveying speed of the longitudinal material as each other.

9. The shop primer line according to any one of claims 1 to 8, further comprising: a leading edge portion detecting sensor located on the upstream side of the shot blasting unit and configured to sense a leading edge portion of the longitudinal material passing in the conveyed direction and output a sense signal; a driving roller conveyor for the shot blasting unit provided with a plurality of rotatably driven driving rollers; a gear made of a magnetic material fixed to any one driving roller of the plurality of the driving rollers; a proximity switch located on a side of a circumference of the gear and configured to detect proximity of a tooth tip of the gear when the gear rotates and output a detection signal; and a control unit configured to cause the first, second, and third blasters to start projecting the shot media after the sense signal is input from the leading edge portion detecting sensor and when a number of detection signals input from the proximity switch reaches a first predetermined number that is defined in advance and to cause the first, second, and third blasters to stop projecting the shot media after the sense signal is input from the leading edge portion detecting sensor and when the number of detection signals input from the proximity switch reaches a second predetermined number that is defined larger than the first predetermined number.

10. The shop primer line according to any one of claims 1 to 8, further comprising: a leading edge portion detecting sensor located on the upstream side of the shot blasting unit and configured to sense a leading edge portion of the longitudinal material passing in the conveyed direction and output a sense signal;

a driving roller conveyor for the coating unit provided with a plurality of rotatably driven driving rollers;

a gear made of a magnetic material fixed to any one driving roller of the plurality of the driving rollers;

a proximity switch located on a side of a circumference of the gear and configured to detect proximity of a tooth tip of the gear when the gear rotates and output a detection signal; and a control unit configured to cause the coating unit to start applying a coating to the longitudinal material after the sense signal is input from the leading edge portion detecting sensor and when a number of detection signals input from the proximity switch reaches a first predetermined number that is defined in advance and to cause the coating unit to stop applying a coating to the longitudinal material after the sense signal is input from the leading edge portion detecting sensor and when the number of detection signals input from the proximity switch reaches a second predetermined number that is defined larger than the first predetermined number.