CN112139961A

CN112139961A - Polishing machine device capable of adjusting and adapting to undulating surface

Info

Publication number: CN112139961A
Application number: CN202011071042.6A
Authority: CN
Inventors: 张凝
Original assignee: Pujiang Sihong Machinery Technology Co ltd
Current assignee: Pujiang Sihong Machinery Technology Co ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2020-12-29

Abstract

The invention discloses a polishing machine device capable of adjusting and adapting to a fluctuating surface, which comprises a box body, wherein the bottom of the box body is provided with a supporting slide block chute with an upward opening, a polishing supporting slide block is connected in the supporting slide block chute in a sliding way, the bottom wall of the supporting slide block chute is fixedly provided with a vent pipe, the left bottom end of the vent pipe is fixedly provided with a pneumatic cavity, a piston is connected in the pneumatic cavity in a sliding way, the upper side of the pneumatic cavity is provided with a workpiece transmission mechanism, the bottom surface of the piston is fixedly connected with a slide rod, the bottom surface of the slide rod is symmetrically and fixedly provided with supporting rods in the front and back, a roller shaft is fixedly arranged between the front and back supporting rods and is rotationally connected with a roller positioned between the front and back supporting rods, the roller is arranged in a curved slide block, but also automatically using a wire brush on the rotating wheel to remove residual compounds.

Description

Polishing machine device capable of adjusting and adapting to undulating surface

Technical Field

The invention relates to the related technical field of polishing machines, in particular to a polishing machine device capable of adjusting and adapting to a wavy surface.

Background

Polishers, also known as grinders, are often used for mechanical grinding, polishing, and waxing. The working principle is as follows: the motor drives the sponge or wool polishing disc arranged on the polishing machine to rotate at a high speed, and the polishing disc and the polishing agent act together and rub the surface to be polished, so that the aims of removing paint surface pollution, oxide layer and shallow mark can be achieved.

The distance between the polishing machine and a workpiece to be polished at the present stage is fixed and unchanged, the plane can only be automatically polished, the distance between the polishing ring and the workpiece needs to be manually controlled for the undulating surface, the operation is complex, excessive manpower is consumed, and the polishing wheel cannot be automatically cleaned after the polishing machine is used.

Disclosure of Invention

In view of the above technical deficiencies, the present invention provides a polishing machine device capable of adjusting to a contoured surface, which overcomes the above drawbacks.

The invention relates to a polishing machine device capable of adjusting and adapting to a fluctuating surface, which comprises a box body, wherein the bottom of the box body is provided with a supporting slide block chute with an upward opening, a polishing supporting slide block is connected in the supporting slide block chute in a sliding way, the bottom wall of the supporting slide block chute is fixedly provided with a vent pipe, the left bottom end of the vent pipe is fixedly provided with a pneumatic cavity, a piston is connected in the pneumatic cavity in a sliding way, the upper side of the pneumatic cavity is provided with a workpiece transmission mechanism, the bottom surface of the piston is fixedly connected with a slide rod, the bottom surface of the slide rod is symmetrically and fixedly provided with supporting rods in the front and back, a roller shaft is fixedly arranged between the front and back supporting rods and is rotationally connected with a roller positioned between the front and back supporting rods, the roller is arranged in a curved slide block chute with a curved slide, the polishing device comprises a polishing support block, a polishing shaft, a polishing transmission mechanism and a polishing support column, wherein the rolling wheel is arranged on the upper side of the polishing support block, the rolling wheel is connected with the undulating top surface in a sliding mode, the top end of the polishing support block is connected with the polishing shaft in a rotating mode, the polishing support column is fixedly arranged at the left end of the polishing shaft, the polishing ring is arranged on the outer ring wall of.

Preferably, the polishing support slider bottom surface with support the slider spout between through support slider spring coupling, the piston bottom surface with through piston spring coupling between the atmospheric pressure chamber, sliding connection has the ejector pad that is located in the curved surface slider rear side in the curved surface slider spout, the fixed movable electro-magnet that is provided with of terminal surface before the ejector pad, movable electro-magnet with curved surface slider magnetic force is linked, ejector pad rear end face with pass through ejector pad spring coupling between the curved surface slider spout, polishing ring upside is provided with the rotatory clean mechanism after the polishing.

Preferably, work piece transmission device including set up in the ascending work piece feed chute of atmospheric pressure chamber upside and opening, work piece feed chute sliding connection has electronic fixture block device, electronic fixture block device top is provided with the ascending work piece draw-in groove of opening, the fixed electronic guide rail that is provided with of work piece feed chute diapire, electronic guide rail with electronic fixture block device power sliding connection, electronic fixture block device rear end wall is fixed and is provided with the metal block, the fixed stay cord that is provided with of electronic fixture block device rear end wall, the stay cord walk around in proper order around last wire winding rod and down wire winding rod with ejector pad rear end face fixed connection, go up the wire winding rod fixed set up in between the end wall about the work piece feed chute rear end, down the wire winding rod fixed set up in between the end wall about curved surface slider spout rear end.

Preferably, the rotation transmission mechanism comprises a lower bevel gear fixedly connected with the right end of the polishing shaft, the lower bevel gear is positioned in a bevel gear cavity arranged in the top end of the polishing support slider, the lower bevel gear is meshed with an upper bevel gear positioned on the upper side of the lower bevel gear, the upper bevel gear is fixedly connected with the bottom end of a spline shaft, the spline shaft is rotatably connected with the top end of the polishing support slider, the spline shaft is slidably connected with a pulley shaft positioned on the upper side of the spline shaft, the pulley shaft is positioned in an open slot with a downward opening, the pulley shaft is rotatably connected with the box body, a left pulley is fixedly arranged at the top end of the pulley shaft, the left pulley is arranged in a belt cavity, the belt cavity is arranged in the top end of the box body, the left pulley is connected with a right pulley positioned on the right side of the left pulley shaft through a belt, the right pulley is fixedly, motor shaft bottom power is connected with the motor, belt chamber diapire is provided with the ascending tensioning piece spout of opening, sliding connection has the tensioning piece in the tensioning piece spout, tensioning piece bottom mounting is provided with the metal strip, tensioning piece bottom surface with through tensioning piece spring coupling between the tensioning piece spout.

Preferably, the polishing rear rotating cleaning mechanism comprises a connecting slide block arranged on the left side of the open slot, the front end wall and the rear end wall of the top end of the connecting slide block are symmetrically and fixedly provided with metal sheets, the metal sheets are positioned in metal sheet chutes with openings facing the connecting slide block and are in sliding connection with the connecting slide block, the bottom surfaces of the metal sheets are connected with the metal sheet chutes through metal sheet springs, the bottom walls of the metal sheet chutes are fixedly provided with cleaning electromagnets, the metal sheets can be connected with circuits between the cleaning electromagnets and a power supply thereof, the bottom surfaces of the connecting slide block are fixedly provided with arc-shaped supporting blocks, the bottom walls of the arc-shaped supporting blocks are fixedly provided with arc-shaped cleaning devices, the metal sheets can be connected with circuits between the transmission electromagnets and the power supply thereof, the transmission electromagnets are fixedly arranged on the bottom, the novel gas pipe tensioning device is characterized in that a check valve is arranged in the coarse gas pipe, a fine gas pipe located on the right side of the coarse gas pipe is fixedly arranged on the bottom wall of the tensioning block sliding groove, a check valve is arranged in the fine gas pipe, and a gas temporary storage cavity is fixedly formed in the bottom wall of the coarse gas pipe and the bottom wall of the fine gas pipe.

Preferably, the gas flow in the coarse gas pipe is greater than the gas flow in the fine gas pipe.

The beneficial effects are that: the device can design different required undulating top surfaces to realize the polishing operation of tightly attaching workpieces with undulating surfaces, so that the polishing device is suitable for undulating surfaces, has wider application range, does not need to manually control the distance between the polishing ring and the workpieces, improves the automation degree and efficiency, can automatically clean the polishing wheel after being used, can automatically use a steel wire brush on the rotating wheel to remove residual compounds, and prolongs the service life of the polishing machine.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a polishing apparatus capable of accommodating a relief surface according to the present invention;

FIG. 2 is a schematic view of A-A in FIG. 1 according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of the structure at B in FIG. 1 according to an embodiment of the present invention;

fig. 4 is an enlarged schematic view of the structure at C in fig. 1 according to the embodiment of the present invention.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations and/or steps that are mutually exclusive.

The invention will now be described in detail with reference to fig. 1-4, for convenience of description, the following orientations will now be defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The invention relates to a polishing machine device capable of adjusting and adapting to a fluctuating surface, which comprises a box body 10, wherein the bottom of the box body 10 is provided with a supporting slide block chute 21 with an upward opening, the supporting slide block chute 21 is connected with a polishing supporting slide block 19 in a sliding way, the bottom wall of the supporting slide block chute 21 is fixedly provided with a vent pipe 20, the bottom end of the left side of the vent pipe 20 is fixedly provided with a pneumatic cavity 23, the pneumatic cavity 23 is connected with a piston 22 in a sliding way, the upper side of the pneumatic cavity 23 is provided with a workpiece transmission mechanism, the bottom surface of the piston 22 is fixedly connected with a slide rod 63, the bottom surface of the slide rod 63 is symmetrically and fixedly provided with support rods 62 in the front-back direction, a roller shaft 61 is fixedly arranged between the front support rod 62 and the rear support rod 62, the polishing device comprises a curved surface sliding block sliding groove 36, a curved surface sliding block 41 is connected in a sliding mode, a corresponding fluctuating top surface 38 designed according to the fluctuating surface of a workpiece is arranged on the top surface of the curved surface sliding block 41, the fluctuating top surface 38 is connected with a roller 60 located on the upper side of the fluctuating top surface in a sliding mode, a polishing shaft 27 is connected to the top end of a polishing supporting sliding block 19 in a rotating mode, a polishing supporting column 45 is fixedly arranged at the left end of the polishing shaft 27, a polishing ring 33 is arranged on the outer ring wall of the polishing supporting column 45.

Beneficially, the bottom surface of the polishing support slider 19 is connected with the support slider sliding groove 21 through a support slider spring 66, the bottom surface of the piston 22 is connected with the air pressure cavity 23 through a piston spring 35, the curved surface slider sliding groove 36 is slidably connected with a push block 40 located at the rear side of the curved surface slider 41, the front end surface of the push block 40 is fixedly provided with a movable electromagnet 64, the movable electromagnet 64 is magnetically linked with the curved surface slider 41, the rear end surface of the push block 40 is connected with the curved surface slider sliding groove 36 through a push block spring 39, and the upper side of the polishing ring 33 is provided with a polishing rear rotating cleaning mechanism.

Advantageously, the workpiece transfer mechanism comprises a workpiece feed slot 44 which is arranged at the upper side of the pneumatic chamber 23 and is opened upwards, an electric fixture block device 25 is connected in the workpiece feeding groove 44 in a sliding manner, a workpiece clamping groove 26 with an upward opening is arranged at the top end of the electric fixture block device 25, the bottom wall of the workpiece feeding groove 44 is fixedly provided with an electric guide rail 24, the electric guide rail 24 is in power sliding connection with the electric fixture block device 25, the rear end wall of the electric fixture block device 25 is fixedly provided with a metal block 34, the rear end wall of the electric fixture block device 25 is fixedly provided with a pull rope 43, the pulling rope 43 sequentially bypasses the upper winding rod 42 and the lower winding rod 65 to be fixedly connected with the rear end surface of the push block 40, the upper winding rod 42 is fixedly disposed between the rear left and right end walls of the workpiece feed slot 44, the lower winding rod 65 is fixedly disposed between the left and right end walls of the rear end of the curved slider sliding groove 36.

Advantageously, the rotation transmission mechanism comprises a lower bevel gear 18 fixedly connected with the right end of the polishing shaft 27, the lower bevel gear 18 is located in a bevel gear cavity 17 arranged in the top end of the polishing support block 19, the lower bevel gear 18 is engaged with an upper bevel gear 16 located on the upper side thereof, the upper bevel gear 16 is fixedly connected with the bottom end of a spline shaft 28, the spline shaft 28 is rotatably connected with the top end of the polishing support block 19, the spline shaft 28 is slidably connected with a pulley shaft 15 located on the upper side thereof, the pulley shaft 15 is located in an open slot 29 with a downward opening, the pulley shaft 15 is rotatably connected with the casing 10, the top end of the pulley shaft 15 is fixedly provided with a left pulley 11, the left pulley 11 is arranged in a belt cavity 50, the belt cavity 50 is arranged in the top end of the casing 10, the left pulley 11 is connected with a right pulley 12 located on the right side thereof through a belt 51, the utility model discloses a belt pulley structure, including box 10, right side band pulley 12 and motor shaft 13 fixed connection, motor shaft 13 with box 10 rotates to be connected, motor shaft 13 bottom power is connected with motor 14, belt chamber 50 diapire is provided with the ascending tensioning block spout 52 of opening, sliding connection has tensioning block 59 in tensioning block spout 52, tensioning block 59 bottom mounting is provided with metal strip 58, tensioning block 59 bottom surface with connect through tensioning block spring 57 between the tensioning block spout 52.

Beneficially, the rotary cleaning mechanism after polishing comprises a connecting slide block 30 arranged on the left side of the open slot 29, the front end wall and the rear end wall of the top end of the connecting slide block 30 are symmetrically and fixedly provided with metal sheets 49, the metal sheets 49 are positioned in a metal sheet sliding slot 47 with an opening facing the connecting slide block 30 and are in sliding connection with the connecting slide block, the bottom surface of the metal sheets 49 is connected with the metal sheet sliding slot 47 through a metal sheet spring 48, the bottom wall of the metal sheet sliding slot 47 is fixedly provided with a cleaning electromagnet 46, the metal block 34 can be connected with a circuit between the cleaning electromagnet 46 and a power supply thereof, the bottom surface of the connecting slide block 30 is fixedly provided with an arc-shaped supporting block 31, the bottom wall of the arc-shaped supporting block 31 is fixedly provided with an arc-shaped cleaning device 32, the metal block 34 can be connected with a circuit between, the fixed thick trachea 56 that is provided with of tensioning block spout 52 diapire, be provided with the check valve in the thick trachea 56, the fixed thin trachea 54 that is located on thick trachea 56 right side that is provided with of tensioning block spout 52 diapire, be provided with the check valve in the thin trachea 54, thick trachea 56 reaches the fixed gaseous chamber 55 of keeping in that is provided with of thin trachea 54 diapire.

Advantageously, the flow of gas in the gas wide tube 56 is greater than the flow of gas in the gas narrow tube 54.

In the initial state, the supporting slider spring 66 and the piston spring 35 are in the stretched state, the push block spring 39 is in the compressed state, the belt 51 is in the tensioned state, and the sheet metal spring 48 and the tension block spring 57 are in the normal stretched state; sequence of mechanical actions of the whole device: 1. the workpiece is clamped into the workpiece clamping groove 26 to be fixed, so that the workpiece moves along with the electric clamping block device 25, the corresponding undulating top surface 38 is designed according to the undulating surface, the stop door 37 is opened, the movable electromagnet 64 is disconnected, the previous curved surface slider 41 is taken out, the corresponding designed curved surface slider 41 is placed in, the movable electromagnet 64 is connected, so that the push block 40 is in magnetic connection with the curved surface slider 41, the curved surface slider 41 moves along with the push block 40, the stop door 37 is closed, the motor 14 is started, the motor shaft 13 rotates, the right belt wheel 12 rotates, the left belt wheel 11 rotates, the belt wheel shaft 15 rotates, the spline shaft 28 rotates, the upper bevel gear 16 rotates, the lower bevel gear 18 rotates, the polishing shaft 27 rotates, the polishing support columns 45 rotate, the polishing rings 33 rotate, the electric guide rails 24 are started, thereby controlling the electric fixture block device 25 and the workpiece to move backwards, and polishing the workpiece; 2. the electric fixture block device 25 moves backwards to enable the pull rope 43 to loosen the drawing of the push block 40, so that the push block 40 moves forwards under the reset action of the push block spring 39, so that the corresponding undulating top surface 38 moves forwards, the height of the undulating top surface 38 changes to a high position to push the roller 60 to move upwards, the roller shaft 61 moves upwards, the supporting rod 62 moves upwards, the sliding rod 63 moves upwards, the piston 22 moves upwards, the gas in the gas pressure cavity 23 is squeezed into the supporting slider sliding groove 21 through the vent pipe 20, the polishing supporting slider 19 moves upwards, the polishing supporting column 45 and the polishing ring 33 move upwards, the polishing ring 33 is polished by being attached to the upper surface of the workpiece with the height changing to a high position, the height of the undulating top surface 38 changes to a low position to enable the roller 60 to move downwards, and the roller shaft 61 moves downwards, so that the support rod 62 moves downwards, the slide rod 63 moves downwards, the piston 22 moves downwards under the action of the return of the piston spring 35, the gas in the support slide chute 21 is pumped into the air pressure cavity 23 through the vent pipe 20, the polishing support slide 19 moves downwards under the action of the return of the support slide spring 66, the polishing support column 45 and the polishing ring 33 move downwards, the lower surface of the workpiece with the bonding height of the polishing ring 33 changed to be low is polished, and the polishing ring 33 is ensured to be tightly bonded with the undulating surface of the workpiece all the time; 3. the electrical latch means 25 moves backwards to its rearmost position, so that the metal block 34 is simultaneously connected to the circuit between the cleaning electromagnet 46 and its power supply and the circuit between the transmission electromagnet 53 and its power supply, thereby turning on the cleaning electromagnet 46 to attract the metal piece 49 to move downward, thereby moving the connecting slider 30, the arc supporting block 31 and the arc cleaning device 32 downward to be attached to the polishing ring 33, turning on the transmission electromagnet 53 to attract the metal strip 58 to move downward, so that the gas in the tensioning block chute 52 is slowly squeezed into the gas temporary storage cavity 55 through the thin gas pipe 54, thereby slowly moving the metal strip 58 and the tension block 59 downward, so that the polishing support column 45 and the polishing ring 33 stop rotating after a certain time, so that the arc cleaning device 32 is kept in contact with the rotating polishing ring 33 for a certain period of time, thereby completing the cleaning of the polishing ring 33; 4. when the device needs to reset, the polished workpiece is taken down, the motor 14 is turned off, the electric guide rail 24 controls the electric fixture block device 25 to move forwards, so that each elastic element plays a resetting role, each moving part stops moving, and therefore gas in the gas temporary storage cavity 55 quickly returns to the tensioning block sliding groove 52 through the thick gas pipe 56, and the device completes resetting.

The above description is only an embodiment of the invention, but the scope of the invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.

Claims

1. The utility model provides a can adjust burnishing machine device that adapts to undulated surface, includes the box, its characterized in that: the bottom of the box body is provided with a supporting slide block chute with an upward opening, the supporting slide block chute is in sliding connection with a polishing supporting slide block, the bottom wall of the supporting slide block chute is fixedly provided with an air pipe, the bottom end of the left side of the air pipe is fixedly provided with an air pressure cavity, the air pressure cavity is in sliding connection with a piston, the upper side of the air pressure cavity is provided with a workpiece transmission mechanism, the bottom surface of the piston is fixedly connected with a slide rod, the bottom surface of the slide rod is symmetrically and fixedly provided with support rods in the front and back directions, a roller shaft is fixedly arranged between the front and back support rods and is rotationally connected with rollers positioned between the support rods on the front and back sides, the rollers are arranged in a curved slide block chute with a forward opening, the curved slide block chute is in sliding connection with a curved slide block, the polishing device is characterized in that the top end of the polishing support sliding block is rotatably connected with a polishing shaft, a polishing support column is fixedly arranged at the left end of the polishing shaft, a polishing ring is arranged on the outer ring wall of the polishing support column, and a rotation transmission mechanism is arranged on the right side of the polishing shaft.

2. A polisher apparatus capable of conditioning a contoured surface as set forth in claim 1 wherein: the polishing support sliding block bottom surface with support between the sliding block spout through supporting the sliding block spring coupling, the piston bottom surface with through piston spring coupling between the atmospheric pressure chamber, sliding connection has in the curved surface sliding block spout is located the ejector pad of curved surface sliding block rear side, the fixed movable electro-magnet that is provided with of terminal surface before the ejector pad, movable electro-magnet with curved surface sliding block magnetic force is linked, ejector pad rear end face with pass through ejector pad spring coupling between the curved surface sliding block spout, it is provided with the rotatory clean mechanism after the polishing to polish the ring upside.

3. A polisher apparatus capable of conditioning a contoured surface as set forth in claim 1 wherein: the workpiece transmission mechanism comprises a workpiece feeding groove, wherein the workpiece feeding groove is formed in the upper side of the air pressure cavity and provided with an upward opening, an electric fixture block device is connected in the workpiece feeding groove in a sliding mode, a workpiece clamping groove with an upward opening is formed in the top end of the electric fixture block device, an electric guide rail is fixedly arranged on the bottom wall of the workpiece feeding groove, the electric guide rail is connected with the electric fixture block device in a power sliding mode, a metal block is fixedly arranged on the rear end wall of the electric fixture block device, a pull rope is fixedly arranged on the rear end wall of the electric fixture block device, the pull rope sequentially bypasses an upper winding rod, a lower winding rod and a push block rear end face fixed connection, the upper winding rod is fixedly arranged between the left end wall and the right end wall of the workpiece feeding groove.

4. A polisher apparatus capable of conditioning a contoured surface as set forth in claim 1 wherein: the rotary transmission mechanism comprises a lower bevel gear fixedly connected with the right end of the polishing shaft, the lower bevel gear is positioned in a bevel gear cavity arranged in the top end of the polishing support slider, the lower bevel gear is meshed with an upper bevel gear positioned on the upper side of the lower bevel gear, the upper bevel gear is fixedly connected with the bottom end of a spline shaft, the spline shaft is rotatably connected with the top end of the polishing support slider, the spline shaft is slidably connected with a pulley shaft positioned on the upper side of the spline shaft, the pulley shaft is positioned in an open slot with a downward opening, the pulley shaft is rotatably connected with the box body, a left pulley is fixedly arranged at the top end of the pulley shaft, the left pulley is arranged in a belt cavity, the belt cavity is arranged in the top end of the box body, the left pulley is connected with a right pulley positioned on the right side of the left pulley through a belt, the right pulley is fixedly, motor shaft bottom power is connected with the motor, belt chamber diapire is provided with the ascending tensioning piece spout of opening, sliding connection has the tensioning piece in the tensioning piece spout, tensioning piece bottom mounting is provided with the metal strip, tensioning piece bottom surface with through tensioning piece spring coupling between the tensioning piece spout.

5. A polisher apparatus capable of conditioning a contoured surface as set forth in claim 2 wherein: the rotary cleaning mechanism after polishing comprises a connecting slide block arranged on the left side of the open slot, the front end wall and the rear end wall of the top end of the connecting slide block are symmetrically and fixedly provided with metal sheets, the metal sheets are positioned in metal sheet chutes of the connecting slide block and are in sliding connection with the metal sheet chutes, the bottom surfaces of the metal sheets are connected with the metal sheet chutes through metal sheet springs, the bottom walls of the metal sheet chutes are fixedly provided with cleaning electromagnets, the metal sheets can be connected with circuits between the cleaning electromagnets and a power supply thereof, the bottom surfaces of the connecting slide block are fixedly provided with arc-shaped supporting blocks, the bottom walls of the arc-shaped supporting blocks are fixedly provided with arc-shaped cleaning devices, the metal sheets can be connected with circuits between the transmission electromagnets and the power supply thereof, the transmission electromagnets are fixedly arranged on the bottom walls, the novel gas pipe tensioning device is characterized in that a check valve is arranged in the coarse gas pipe, a fine gas pipe located on the right side of the coarse gas pipe is fixedly arranged on the bottom wall of the tensioning block sliding groove, a check valve is arranged in the fine gas pipe, and a gas temporary storage cavity is fixedly formed in the bottom wall of the coarse gas pipe and the bottom wall of the fine gas pipe.

6. A polisher assembly capable of conditioning a contoured surface as set forth in claim 5 wherein: the gas flow in the coarse air pipe is larger than the gas flow in the fine air pipe.