KR20040094195A - Apparatus for cleansing a cleansing object - Google Patents

Abstract

PURPOSE: A work cleansing device is provided to simplify and compact the cleansing device and to easily maintain by installing many nozzles in all directions. CONSTITUTION: An upper cleansing device(C) comprises a main shaft, a driving device, a transferring device, a rotating plate, a rotating shaft, a gear, a horizontal shaft, a sprocket, upper nozzle links, a driving device, upper nozzles and each pipe. The main shaft has a freely rotated hollow portion with a rotary valve to be installed in a frame. The driving device and the transferring portion rotate the main shaft. The rotating plate has a branch manifold to be installed in the main shaft. The rotating shaft has a freely rotated hollow portion with a rotary valve to be installed by hanging in the rotating plate. The horizontal shaft is installed in the rotating plate. The horizontal shaft rotates the rotating shaft by gearing with a gear in a sleeve to be fixed in the frame. The sprocket is installed in the horizontal shaft. The upper nozzle links are installed in the rotating shaft. The driving device rotates the upper nozzle link. The upper nozzles are connected with the hollow portion of the rotating shaft by installing in the upper nozzle links. The pipes connects the rotary valve with the branch manifold. A side cleansing device(D) comprises a support, a rotating shaft, a sprocket, side nozzle links, pairs of side nozzles and each pipe. The support is installed in the rotating plate. The rotating shaft has a freely rotated hollow portion with a rotary valve to be installed in the support. The sprocket is connected with the sprocket of the upper cleansing device through a chain.

Description

Work cleaning device {APPARATUS FOR CLEANSING A CLEANSING OBJECT}

The present invention relates to a work cleaning device.

Conventional work cleaning methods and apparatuses are configured to determine a cleaning point of a work, install a plurality of nozzles aimed at the cleaning point, and blow out water and / or air from the plurality of nozzles to clean and dry. Therefore, a large number of nozzles are required, which leads to the complexity of the cleaning apparatus and piping, the increase in the size, the complexity of the maintenance, and the like, or the installation of the plurality of nozzles in the apparatus, the complexity of the cleaning apparatus, the enlargement, or the maintenance of the maintenance. There was a problem causing back.

As a means for solving this problem, it demonstrates with reference to documents (1)-(3), and literature (1) is a rotating nozzle apparatus of Unexamined-Japanese-Patent No. 7-31575, and its design method. The present invention utilizes a nozzle constructed from a plurality of links, and randomly changes the spray angle of water sprayed from the nozzle of the nozzle using the chaotic principle, and randomly sprays from the nozzle using this change. It is to efficiently and quickly wash using uniform water spray and diffusion. Document (2) is a washing apparatus of Japanese Patent Laid-Open No. 6-226220. The invention provides a pair of nozzles that rotate and rotate in a horizontal direction using a support arm, and diffuses the cleaning liquid and / or hot water from the pair of nozzles. The metering parts are cleaned efficiently and cleanly. Document (3) is a spray nozzle moving device in the pearl shell washer of Japanese Unexamined Patent Application, First Publication No. 3-45569. This design engages a small gear rotating on a large gear revolving on the main shaft and installs a branch pipe with a nozzle on the small gear, and uses a small gear rotating on the large rotating gear to perform extensive cleaning. To achieve efficient cleaning.

In general, the documents (1) to (3) provide a link to rotate on a main shaft and a link to rotate, and a plurality of nozzles provided on the link, and to rotate and rotate the nozzle (rotating and rotating nozzles). ) To diffuse the washing water in a wide range to achieve efficient cleaning and to achieve efficient cleaning. However, this rotating and rotating nozzle is configured to use the rotating and rotating in the horizontal direction (planar area).

Therefore, Document (1)-(3) cannot wash | clean a washing | cleaning object (work), such as a workpiece | work, a workpiece, a product in all directions. Moreover, the workpiece conveyed to a predetermined position cannot be washed in all directions at this position. In addition, since literature (1)-(3) washes a side surface separately when it is upper and lower, it can understand that it improved compared with the past, but installing a nozzle in each position requires a large number of nozzles, There is a problem that the complexity of the cleaning device and piping, the size of the cleaning device, and the maintenance of the maintenance, or the like, or the installation of a plurality of nozzles in the cleaning device, the complexity of the cleaning device, the enlargement, or the maintenance of the maintenance.

The invention of claim 1 can be cleaned in all directions at the same time by using a plurality of nozzles provided on the upper and lower surfaces and on the side, and by using the cleaning in all directions, the simplification, miniaturization, and maintenance of the cleaning device and piping are easy. In order to reduce the number of nozzles, or to install a plurality of nozzles in various directions in the washing apparatus, the washing apparatus can be simplified, downsized, maintenance can be simplified, the cleaning efficiency can be improved, and the shortening can be achieved. Try to get angry.

Claim 1 is a table provided with a conveying apparatus which is responsible for advancing and retreating a workpiece, a water and air piping for cleaning and drying the front surface of the workpiece moved to this conveying apparatus, and an upper surface nozzle provided on the upper surface of the said conveying apparatus. A top surface cleaning device having a top surface; a side surface cleaning device having side nozzles provided on both sides of the transfer device; a bottom surface cleaning device having a bottom surface nozzle provided on a bottom surface of the transfer device; In the work cleaning device composed of means for supplying air,

The upper surface cleaning apparatus includes a main shaft having a freely rotatable hollow portion provided with a rotary valve provided on the frame, a drive means and a transmission unit responsible for rotating the main shaft, a rotating plate provided with a branch manifold provided on the main shaft, and the rotating plate. A rotating shaft having a rotatable free hollow having a rotary valve mounted to the rotary shaft, a gear provided on the rotating shaft, and a gear provided on the sleeve fixed to the frame to rotate the rotating shaft, the horizontal shaft provided on the rotating plate, and the horizontal axis. A sprocket installed at the upper surface, an upper nozzle link provided at the rotary shaft, the driving means for rotating the upper nozzle link, an upper nozzle communicating with a hollow portion of the rotary shaft provided at the upper nozzle link, the rotary valve, Consisting of each pipe communicating the branch manifold,

In addition, the side cleaning device is connected via a support shaft provided on the rotating plate of the upper surface cleaning apparatus, a rotating shaft having a freely rotatable hollow portion provided with a rotary valve provided on the support, and a sprocket and a chain of the upper surface cleaning apparatus for rotating the rotating shaft. A sprocket, a side nozzle link provided on the rotating shaft, a pair of side nozzles communicating with a hollow portion of the rotating shaft provided on the side nozzle link, and a respective pipe communicating the rotary valve of the rotating shaft and the branch manifold. Become,

The cleaning apparatus further includes a longitudinal axis having a freely rotatable hollow portion provided with a rotary valve provided on the frame, a rotating means for rotating the longitudinal axis, a rotating plate provided on the vertical axis, a rotating shaft provided on the rotating plate, and a rotating shaft. The lower surface nozzle link provided, the rotation means which is responsible for rotation of this lower surface nozzle link, the lower surface nozzle provided in the said lower surface nozzle link, and the pipe | tube which communicates the said rotary valve are the workpiece | work cleaning apparatus characterized by the above-mentioned.

1 is a flow chart illustrating the outline of the present invention;

2 is a plan view showing an outline of a plane;

3 is a side view showing an outline of a side surface;

4 is a plan view of a main part,

Fig. 5 is a sectional view of the main part,

6 is a sectional view of the main part,

7 is a sectional view of the top of the upper cleaning device;

8 is a sectional view of the front of the upper cleaning device;

9 is an enlarged side view illustrating a relationship between a branch manifold, a pipe, and a rotary valve;

10 is a flowchart illustrating the supply of water and

11 is a flowchart illustrating the supply of air.

* Explanation of symbols for main parts of the drawings

A: Carrier 1, 2: Sprocket

3, 4: chain B: table

5: gap C: top cleaning device

6 to 6n: Top nozzle 7: Spindle

7a: rotary valve 7b: hollow part

8: motor 9: transmission section

10: rotating plate 11: rotating shaft

11a: rotary valve 11b: hollow part

1100: sleeve 1101, 1102: bevel gear

1103: mounting portion 1104: horizontal axis

1105: sprocket 12, 12a: spur gear

13-13n: Top nozzle link D: Side cleaning device

15 to 15n: side nozzle 16: support

17: rotary shaft 17a: rotary valve

17b: hollow portion 18: sprocket

19: Chain 20-20n: Side nozzle link

E: Lower surface cleaning device 21 to 21n: Lower surface nozzle

22: vertical axis 22a: rotary valve

22b: hollow part 23: motor

24 to 24n: Pulley 25: Belt

26: rotating plate 27: rotating shaft

28-28n: Lower nozzle link 29-29n: Spur gear

F1: Means for Supplying Water 30: Water Tank

31: pump 32: branch manifold

32a. 32b, 32c, 33: piping 34: valve

35: sump 36: filter

F2: Means for Supplying Air 40: Compressor

41: pump 42: branch manifold

42a, 42b, 42c, 43: piping 44: valve

H: Frame N: Nozzle

W: Walk

Hereinafter, an example of work washing will be described. The workpiece is placed (replaced) on a table having a configuration through which water and / or air, which are located at the delivery port of the conveying apparatus installed in this washing apparatus, can pass. Thereafter, the conveying apparatus operates to move the work and the table to the washing position, and stops at the first predetermined position (first position) by using a detection means such as a limit switch. After this stop, the front direction of the work is cleaned using the nozzle of the upper surface cleaning device, the nozzle of the side cleaning device, the jet of water from the nozzle of the lower surface cleaning device, and the rotation and revolution of each of these nozzles. In addition, each nozzle can be subjected to various kinds of operations such as simultaneous cleaning and / or time difference cleaning, and is selected in consideration of the shape, dimensions, cleaning accuracy, and the like of the workpiece. Moreover, although not shown in figure, the structure which rotates a table is also possible.

When the cleaning at the first position is completed, the conveying apparatus operates to move the workpiece and the table to the cleaning position, and stops at the next predetermined position (second position) using a detection means such as a limit switch. After this stop, the whole direction of the workpiece is dried using the nozzle of the upper surface cleaning apparatus, the nozzle of the side cleaning apparatus, the jet of air from the nozzle of the lower surface cleaning apparatus, and the rotation and revolution of each of these nozzles. In addition, various nozzles are possible, such as simultaneous drying and / or time-dried drying, and it selects in consideration of the shape of a workpiece | work, a dimension, washing precision, etc. Other configurations and operations are based on the examples described above.

When the drying in the second position is completed, the conveying apparatus operates to move the work and the table to the loading position, and stops at the first predetermined position (first position) by using a detection means such as a limit switch. The washed and dried workpiece at this stop position is taken out. Subsequent work follows the above-mentioned example.

The above description distinguishes the first position from the second position, and cleans at the first position and dries at the second position. At a constant moving position (for example, the first position), cleaning and drying are performed. Simple and easy types of implementation can achieve the same effect.

Hereinafter, an example of the processing method of this invention is demonstrated.

The main components of the present invention include a conveying apparatus (A), which is responsible for the forward and retreat of the workpiece (W), a table (B) having a configuration through which water and / or air moving to the conveying apparatus (A) can pass; A top cleaning device (C) having a nozzle for planetary motion using rotation and revolution installed on an upper surface of the transport device (A), and rotation and revolution installed on both sides of the transport device (A). Side nozzles (D, D) (described in one side cleaner (D)) having planetary motion nozzles, and nozzles that are planetary motion using rotation and revolution provided on the lower surface of the transport device (A). It is a work washing | cleaning apparatus comprised with the lower surface washing | cleaning apparatus E provided, and means F1 and F2 which supply water and / or air of the said nozzle.

The conveying apparatus A is comprised from the sprockets 1 and 2 supported by the frame H, and the chains 3 and 4 suspended between these sprockets 1 and 2, Either of the sprocket 1 or the sprocket 2 is driven by a motor (not an example of the driving means) not shown. In addition, the stop | stop at the predetermined position of the chains 3 and 4 uses electrical means, such as a limit switch or a relay which is not shown in figure.

The table B is a means which spans the workpiece | work W, and is a structure which has the clearance 5 in the upper and lower surfaces of the said workpiece | work W, and the clearance gap 5 through which water and air can pass. In this example, the knitting body is used. This table B is provided in the chains 3 and 4 of the said conveying apparatus A. As shown in FIG. Therefore, it is comprised with the structure which moves with the travel of this chain 3, 4, and stops at 1st, 2nd position, etc.

The upper surface cleaning apparatus C is provided in the upper surface of the said conveying apparatus A, and has many nozzles (upper surface nozzles 6-6n) which are planetary motions using rotation and revolution. The upper surface cleaning device C includes a freely rotatable main shaft 7 having a hollow portion 7b provided through a bearing on the frame H, and a driving means (motor 8) responsible for the rotation of the main shaft 7. ), A belt and a pulley (transmitting section 9) for transmitting the rotation of the motor 8 to the main shaft 7, the rotating plate 10 provided on the main shaft 7, and the rotating plate 10 A rotating shaft 11 having a hollow portion 11b, which is suspended, and a driving portion responsible for the rotation of the rotating shaft 11 (this driving portion is fixed to the sleeve 1100 and the sleeve 1100). It consists of the spur gear 12 and the spur gear 12a fixed to the rotating shaft 11. Therefore, the rotation of this rotating shaft 11 revolves by the rotating plate 11 by the rotating plate 11, and this rotating shaft 11 is carried out. The spur gear 12a mounted on the shaft) rotates `` this spur gear 12 does not rotate '' with the spur gear 12 provided on the sleeve 1100 as the shaft center. , This Upper nozzle links 13 to 13n provided on the rotary shaft 11, the drive unit responsible for rotation of the upper nozzle links 13 to 13n, and the nozzles 6 to 13 provided on the upper nozzle links 13 to 13n. 6n). Therefore, the idling of the upper surface nozzle 6 is performed through the path of the motor 8 → transmission part 9 → main shaft 7 → rotating plate 10. The top nozzle 6 is rotated from the motor 8 to the transmission part 9 to the spindle 7 to the sleeve 1100, to the rotary shaft 11, to the spur gears 12 and 12a to the top nozzle link 13 to 13n. Is executed through). Moreover, the rotation of the rotating shaft 11 is carried out by the bevel gear 1101 provided in this rotating shaft 11, and the attachment part 1103 of the rotating plate 10 via the bevel gear 1102 which meshes with this bevel gear 1101. The horizontal shaft 1104 which hangs and supports through a bearing is rotated, and the sprocket 1105 provided in this horizontal shaft 1104 is rotated. This sprocket 1105 is associated with the sprocket of the side cleaning apparatus described later. In this example, a plurality of nozzles which are planetary by using rotation and high electric power are installed in pairs and perform the same operation.

The method for supplying water and / or air to the nozzles 6 to 6n includes a rotary valve 7a communicating with the hollow portion 7b provided on the main shaft 7, and a hollow portion suspended from the rotating plate 10 ( The main component is the rotating shaft 11 provided with 11b), and the branch manifold 32 (42) provided in the rotating plate 10. As shown in FIG. Accordingly, water and / or air are supplied from the rotary valve 7a through the hollow portion 7b of the main shaft 7 and then piped through the branch manifold 32 (42) provided on the rotating plate 10. It introduces into the hollow part 11b of the rotating shaft 11 via 32a (42a) and the rotary valve 11a. To simplify this supply method, the water and / or air from the water tank and / or the compressor is transferred from the rotary valve 7a to the hollow portion 7b of the spindle 7a to the branch manifold 32 (42) to the piping. (32a (42a)) → rotary valve 11a → hollow section 11b of rotary shaft 11 → finds progress of nozzles 6 to 6n.

The side cleaning device (D) is provided on the side of the conveying device (A) and has a plurality of nozzles (side nozzles 15 to 15n) which are planetary motion by using rotation and revolution. The side cleaning device (D) includes a support shaft (16) provided on the rotating plate (10) of the upper surface cleaning device (C), a rotating shaft (17) provided with a hollow portion (17b) provided on the support member (16), and Rotation means responsible for the rotation of the rotary shaft 17 (in this example, the sprocket 1105 of the horizontal shaft 1104 and the sprocket 18 of the rotary shaft 17 provided on the support base 16 to the chain 19). And the rotation of the sprocket 1105 via the chain 19 to the sprocket 18, the side nozzle links 20 to 20n provided on the rotary shaft 17, and the side nozzle links ( It consists of a pair of side nozzles 15-15n provided in 20-20n). In addition, the revolution of the side nozzles 15-15n is performed through the rotation of the said rotating plate 10. As shown in FIG. The side nozzles 15 to 15n are rotated through the horizontal axis 1104 → sprocket 1105 → chain 19 → sprocket 18 → rotary shaft 17 → side nozzle links 20 to 20n.

The method for supplying water and / or air to the nozzles 15 to 15n includes a rotary valve 17a communicating with the hollow portion 17b provided on the rotary shaft 17, and the branch manifolds 32 (42). The pipe 32b (42b) which communicates with is made into a main component. Accordingly, water and / or air are supplied from the rotary valve 7a through the hollow portion 7b of the main shaft 7 and then piped through the branch manifold 32 (42) provided on the rotating plate 10. It introduces into the hollow part 17b of the rotating shaft 17 via 32b (42b) and the rotary valve 17a. Briefly describing this supply method, the water and / or air from the water tank and / or the compressor is transferred from the rotary valve 7a to the hollow portion 7b of the spindle 7 to the branch manifold 32 (42) to the piping. (32b (42b)) → rotary valve 17a → finds the progress of the hollow portion 17b → nozzles 15 to 15n of the rotary shaft 17.

The lower surface cleaning apparatus E is provided in the lower surface of the said conveying apparatus A, and has many nozzles (lower surface nozzles 21-21n) which are planetary motion using rotation and revolution. In this case, the washing apparatus E includes a vertical axis 22 having a rotating hollow portion 22b provided on the frame H, and a rotating means for rotating the vertical axis 22 (in this example, the motor 23). ), An output shaft of the motor 23, pulleys 24 to 24n provided on the vertical shaft 22, a belt 25), a rotating plate 26 provided on the vertical shaft 22, The rotating shaft 27 provided in this rotating plate 26, the lower surface nozzle links 28-28n provided in this rotating shaft 27, and the rotating means which are responsible for rotation of the lower surface nozzle links 28-28n (in this example, It consists of the spur gears 29-29n provided in the said vertical axis | shaft 22 and the said rotating shaft 27, and the lower surface nozzles 21-21n provided in the said lower surface nozzle links 28-28n. Therefore, the revolving of lower surface nozzles 21-21n is performed through the motor 23-> rotating means-vertical axis | shaft 22-> lower surface nozzle links 28-28n. In addition, the rotation of the nozzles 21 to 21n is performed through the motor 23 → the longitudinal axis 22 → the rotation means → the lower nozzle links 28 to 28n.

The method of supplying water and / or air to these nozzles 21-21n is introduce | transduced into the hollow part 22b of the vertical axis | shaft 22 from the rotary valve 22a via piping 32c (42c). Briefly explaining this supply method, the water and / or air from the water tank and / or the compressor finds the progress of the rotary valve 22a-the hollow part 22b-the nozzles 21-21n of the longitudinal axis 22. .

Hereinafter, an example of a method related to cleaning and drying will be described. From the top nozzles 6 to 6n, the bottom nozzles 21 to 21n, and the side nozzles 15 to 15n (generally referred to as nozzles N). Means F1 for supplying water include a water tank 30, a pump 31, branch manifolds 32, rotary valves 7a, 11a, 17a, 22a, pipes 32a to 32c and 33, It is formed by the main component with the various valves 34, and the water of the water tank 30 is sprayed to the workpiece | work W using the nozzle N. As shown in FIG. In the figure, '35' represents a sump and '36' represents a filter.

The means for supplying air F2 includes a compressor 40, a pump 41, a branch manifold 42, rotary valves 7a, 11a, 17a, 22a, pipes 42a to 42c, 43, And main components with various valves 44, and the air of the compressor 40 is injected into the work W by using the nozzle N. As shown in FIG.

The invention of claim 1 is a table provided with a conveying apparatus in charge of advancing and retracting a workpiece, a water and air piping for cleaning and drying the front surface of the workpiece moving to the conveying apparatus, and an upper surface nozzle provided on the upper surface of the conveying apparatus. Supplying water and / or air to each nozzle, the upper surface cleaning apparatus including the upper surface cleaning apparatus, the side cleaning apparatus including the side nozzles provided on both sides of the conveying apparatus, the lower surface cleaning apparatus including the lower surface nozzles provided on the lower surface of the conveying apparatus, and each nozzle. A work cleaning device comprising: a main shaft having a freely rotatable hollow portion provided with a rotary valve provided on a frame, a driving means and a transmission unit for rotating the main shaft, and a branch manifold provided on the main shaft. A rotating shaft having a rotating plate having a rotary plate, a rotating free hollow portion having a rotary valve suspended from the rotating plate, and a gear provided at the rotating shaft, The rotating shaft is rotated by engagement with the gear installed in the sleeve fixed to the frame, the horizontal axis provided on the rotating plate, the sprocket provided on the horizontal axis, the upper nozzle link provided on the rotating shaft, the driving means responsible for rotating the upper nozzle link, and the upper nozzle. It consists of an upper surface nozzle communicating with the hollow part of the rotating shaft installed in the link, and each pipe communicating the rotary valve and the branch manifold, and the side cleaning device includes a support provided on the rotating plate of the upper cleaning device, and a rotary valve provided on the support. A pair of rotating shafts having a freely rotatable hollow portion, a sprocket connected through a chain and a sprocket of the upper surface cleaning apparatus for rotating the rotating shaft, a side nozzle link provided on the rotating shaft, and a pair communicating with the hollow portion of the rotating shaft provided on the side nozzle link. Each pipe connecting the side nozzle, the rotary valve of the rotating shaft, and the branch manifold The cleaning device further comprises a longitudinal axis having a freely rotatable hollow portion provided with a rotary valve mounted to the frame, a rotating means for rotating the longitudinal axis, a rotating plate provided on the vertical axis, a rotating shaft provided on the rotating plate, and a lower surface provided on the rotating shaft. And a nozzle link, a rotating means for rotating the lower nozzle link, a lower nozzle provided on the lower nozzle link, and a pipe communicating with the rotary valve.

Therefore, it is possible to wash the workpiece in all directions at substantially the same time by using the conveying apparatus that is responsible for the forward and backward movement of the workpiece, and a plurality of nozzles provided on the upper and lower surfaces and the side surfaces moving to the conveying apparatus. It is possible to simplify, reduce the size of the cleaning device and piping, or to facilitate maintenance, etc., or to install a plurality of nozzles in various aspects of the cleaning device, simplifying the cleaning device, reducing the size, or facilitating maintenance. In addition, the cleaning efficiency can be improved, the shortening can be achieved, and furthermore, the handling can be facilitated, or the energy can be saved.

Claims (1)

And a table having a conveying apparatus for advancing and retracting the work, a table for pipes for water and air moving to the conveying apparatus for cleaning and drying the entire surface of the workpiece, and an upper nozzle provided on the upper surface of the conveying apparatus. Supplying water and / or air to each of the nozzles; a side cleaning device having an upper surface cleaning device, side cleaning nozzles provided on both sides of the conveying device; a lower surface cleaning device having lower surface nozzles provided on the lower surface of the conveying device; In the workpiece cleaning apparatus constituted by means for The upper surface cleaning apparatus includes a main shaft having a freely rotatable hollow portion provided with a rotary valve provided on the frame, a drive means and a transmission unit responsible for rotating the main shaft, a rotating plate provided with a branch manifold provided on the main shaft, and the rotating plate. A rotating shaft having a rotatable free hollow having a rotary valve attached to the rotating shaft, a gear provided on the rotating shaft, and a gear provided on a sleeve fixed to the frame, the rotating shaft being rotated, the horizontal shaft provided on the rotating plate, and the horizontal axis A sprocket installed at the upper surface, an upper nozzle link provided at the rotary shaft, the driving means for rotating the upper nozzle link, an upper nozzle communicating with a hollow portion of the rotary shaft provided at the upper nozzle link, the rotary valve, Consisting of each pipe communicating the branch manifold, In addition, the side cleaning device is connected via a support shaft provided on the rotating plate of the upper surface cleaning apparatus, a rotating shaft having a freely rotatable hollow portion provided with a rotary valve provided on the support, and a sprocket and a chain of the upper surface cleaning apparatus for rotating the rotating shaft. A sprocket, a side nozzle link provided on the rotating shaft, a pair of side nozzles communicating with the hollow portion of the rotating shaft provided on the side nozzle link, and a respective pipe communicating the rotary valve of the rotating shaft and the branch manifold. Become, The cleaning apparatus further includes a longitudinal axis having a freely rotatable hollow portion provided with a rotary valve provided on the frame, a rotating means for rotating the longitudinal axis, a rotating plate provided on the vertical axis, a rotating shaft provided on the rotating plate, and a rotating shaft. And a lower surface nozzle link provided, rotating means for rotating the lower surface nozzle link, a lower surface nozzle provided on the lower surface nozzle link, and a pipe communicating the rotary valve.