Ultrasonic scanning water removal mechanism

Abstract

The invention relates to the technical field of ultrasonic detection, in particular to an ultrasonic scanning water removal mechanism. Comprising a machine shell, a wind shell is fixed to the middle of the top of the machine shell, a feeding port and a discharging port are formed in the positions, at the two ends of the wind shell, of the top of the machine shell respectively, a feeding baffle and a discharging baffle are slidably connected to the positions, at the feeding port and the discharging port, of the top of the machine shell respectively, and a conveying belt for conveying from the feeding port to the discharging port is arranged in the machine shell. A plurality of vertical downward blowing pipes are arranged in the air shell, the blowing pipes are conical, and the diameter of the upper ends of the blowing pipes is smaller than that of the lower ends of the blowing pipes. The detected jig is placed into the machine shell from the feeding port, and the feeding baffle and the discharging baffle slide to shield the feeding port and the discharging port. The conveying belt conveys the jig to the air shell, the air blowing pipe blows air to the surface of the jig, and water on the surface of the jig is removed. And finally, the jig is taken out from the discharge hole. The diameter of the lower end of the blowing pipe is large, the blowing area is large, and the water removal efficiency is high.

Description

Technical Field

[0001] The present application relates to the technical field of ultrasonic detection, and in particular to an ultrasonic scanning water removal mechanism. Background Art

[0002] Scanning Ultrasonic Microscope (SAT) testing uses pure water as a medium to transmit ultrasonic signals. The system detects the differences in reflection rate and energy between high-frequency ultrasound and materials of varying densities. Before testing, the sample is placed on the surface of the fixture, and the fixture and sample are completely immersed in water.

[0003] After the test is completed, a large amount of moisture remains on the surface of the fixture and the sample. Usually, the moisture on the sample surface is removed by artificial blowing, but the removal efficiency is low. Summary of the Invention

[0004] In order to improve the water removal efficiency, the present application provides an ultrasonic scanning water removal mechanism.

[0005] The ultrasonic scanning water removal mechanism provided in this application adopts the following technical solution: An ultrasonic scanning dewatering mechanism includes a casing, a wind casing is fixed in the middle position of the top of the casing, a feed port and a discharge port are formed at both ends of the wind casing on the top of the casing, a feed baffle and a discharge baffle are slidably connected at the feed port and the discharge port on the top of the casing, a conveyor belt is provided in the casing for transporting from the feed port to the discharge port, and a plurality of vertical downward blowing pipes are provided in the wind casing, the blowing pipes are arranged in a conical shape, and the upper end diameter of the blowing pipe is smaller than the lower end diameter.

[0006] Using this technical solution, the inspected jig is placed into the machine housing through the inlet. The inlet and outlet baffles slide to block the inlet and outlet. A conveyor belt transports the jig to the air housing, where a blower pipe blows air across the jig's surface to remove any water. Finally, the jig is removed from the outlet. The larger diameter of the blower pipe's lower end allows for a wider airflow area, resulting in higher water removal efficiency.

[0007] Preferably, the conveyor belt includes an inlet belt and an outlet belt with the same conveying direction, a gap is left between the inlet belt and the outlet belt, the blowing pipe is opposite to the gap, an inclined lower plate is vertically slidably connected in the gap, the upper end of the inclined lower plate is provided with a limiting step that cooperates with the end of the jig, and an inclined upper plate is vertically slidably connected to the end of the wind shell near the feed port, and the lower end of the inclined upper plate is provided with a clamping step that cooperates with the end of the jig.

[0008] By adopting the above technical solution, the conveyor belt transports the jig to the gap, the inclined lower plate slides upward, the limiting step contacts the end face of the jig, and the inclined upper plate slides down, and the clamping step contacts the other end of the jig. Because the inclined lower plate is tilted as a whole, as the inclined lower plate slides down, it will generate an oblique thrust on the jig until the end face of the jig is parallel to the limiting step, so that the inclined upper plate and the inclined lower plate can clamp the jig. The jig as a whole is also clamped in an inclined state. At this time, the blow pipe blows air to the upper surface of the jig to remove water. On the one hand, the water is blown off and evaporated, and on the other hand, most of the water is blown down and drips along the inclined jig due to the vertical downward force of the wind, thereby further improving the water removal efficiency.

[0009] Preferably, a limit cylinder is vertically provided in the gap, the output shaft of the limit cylinder is connected to the limit seat, a rotating plate is rotatably connected to the limit seat, the inclined lower plate is fixedly connected to the lower end of the rotating plate, the upper end of the rotating plate is located in the wind shell and is provided with a clamping cylinder, and the inclined upper plate is connected to the output shaft of the clamping cylinder.

[0010] By adopting this technical solution, the output shaft of the limit cylinder extends, driving the inclined lower plate upward, interfering with the jig. The output shaft of the clamping cylinder extends, driving the inclined lower plate downward, clamping the jig. The rotating plate rotates, driving the inclined upper and lower plates simultaneously, tilting the jig, facilitating water removal.

[0011] Preferably, clamping holes for clamping and transportation are provided at both ends of the jig, and clamping blocks matching the clamping holes are provided on the limiting steps.

[0012] By adopting the above technical solution, when the limiting step clamps the jig, the clamping block is inserted into the clamping hole, thereby improving the clamping effect of the limiting step on the jig and improving the stability of the jig during rotation.

[0013] Preferably, the rotating plate includes a rotating lower plate and a rotating upper plate, the rotating lower plate is rotatably connected to the limit seat, the inclined lower plate is fixedly connected to the rotating lower plate, a telescopic rod is fixed to the rotating lower plate, the upper end of the telescopic rod is connected to the rotating upper plate, the clamping cylinder is connected to the rotating upper plate, a rotating cylinder is rotatably connected in the wind shell, and the output shaft of the rotating cylinder is rotatably connected to the end of the rotating upper plate close to the clamping cylinder.

[0014] By adopting this technical solution, the rotating upper plate and the rotating lower plate are slidably connected by a telescopic rod. When the output shaft of the limit cylinder is extended or retracted, the rotating lower plate and the tilting lower plate can slide up and down without being affected by the rotating upper plate. After the tilting upper and tilting lower plates clamp the jig, the output shaft of the rotating cylinder extends, pushing the rotating upper plate to rotate. The rotating upper plate then drives the rotating lower plate to rotate synchronously via the telescopic rod, thus causing the tilting upper and tilting lower plates to rotate synchronously, allowing the jig to tilt and facilitate use.

[0015] Preferably, a plurality of arc-shaped grooves having the same movement path as the rotating upper plate are provided in the wind shell, and a positioning block which is slidably connected to the arc-shaped groove is fixed on the rotating upper plate.

[0016] By adopting the above technical solution, when the rotating upper plate rotates, the positioning block slides in the arc groove. The positioning block and the arc groove cooperate with each other to guide and limit the rotation path of the rotating upper plate, thereby improving the rotation stability of the rotating upper plate.

[0017] Preferably, the conveyor belt includes a plurality of conveying rollers and a belt arranged outside the conveying rollers. A reciprocating roller is rotatably connected in the wind shell. The reciprocating roller is connected to one of the conveying rollers through a transmission belt. The wind shell has an inherent mounting seat. The mounting seat is horizontally slidably connected to the reciprocating seat. The blowing pipe is fixedly connected to the reciprocating seat. A connecting rod is hinged on the edge of the reciprocating roller, and the end of the connecting rod away from the reciprocating roller is hinged to the reciprocating seat.

[0018] By employing this technical solution, the jig is clamped by the inclined upper and lower plates, releasing it from the conveyor belt while continuing to rotate. The conveyor roller, via the transmission belt, drives the reciprocating roller, which, via a connecting rod, drives the reciprocating seat in linear, left-right motion. The reciprocating seat drives the blowpipe in continuous left-right movement, further expanding the blowpipe's airflow range and improving water removal efficiency.

[0019] Preferably, a horizontal blowing pipe is provided in the wind shell and is located below the blowing pipe.

[0020] By adopting the above technical solution, the horizontal blowing pipe blows air to the side of the fixture to remove moisture from the side of the fixture.

[0021] Preferably, a concave water collecting tank is provided at the bottom of the casing, and a drain pipe is provided at the bottom of the water collecting tank.

[0022] By adopting the above technical solution, the water blown off the fixture is collected in the water collecting tank and finally discharged through the drain pipe, thereby reducing the residual moisture in the casing.

[0023] In summary, this application has the following beneficial technical effects: By setting the inclined upper plate and the inclined lower plate, when the jig is blowing air to remove water, the inclined upper plate and the inclined lower plate cooperate with each other to make the jig in an inclined state. When the air blower blows air on the jig, water can quickly slide down the jig, thereby improving the water removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 1 is a schematic diagram of the overall structure of the embodiment; Figure 2 1 is a schematic diagram of the internal structure of an embodiment; Figure 3 This is a structural diagram for illustrating the connection between the conveying roller and the reciprocating roller in the embodiment; Figure 4 This is a schematic structural diagram for illustrating the clamping mechanism in the embodiment; Figure 5 This is a schematic diagram showing the structure of the arc groove in the embodiment; Figure 6 yes Figure 5 Enlarged schematic diagram of part A in the middle.

[0025] Description of reference numerals: 1. Casing; 11. Feed port; 12. Discharge port; 13. Feed baffle; 14. Discharge baffle; 15. Water collecting trough; 16. Drain pipe; 2. Air housing; 21. Arc trough; 3. Conveyor belt; 31. Infeed belt; 32. Outfeed belt; 33. Gap; 34. Conveyor roller; 35. Belt; 41. Blowing pipe; 42. Reciprocating roller; 43. Transmission belt; 44. Mounting seat; 45. Reciprocating seat; 46. 6. Connecting rod; 47. Horizontal blowing tube; 51. Inclined lower plate; 511. Limiting step; 512. Clamping block; 52. Limiting cylinder; 53. Limiting seat; 61. Inclined upper plate; 611. Clamping step; 62. Clamping cylinder; 7. Rotating plate; 71. Rotating upper plate; 711. Positioning block; 72. Rotating lower plate; 73. Telescopic rod; 74. Rotating cylinder; 8. Fixture; 81. Clamping hole. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with all the accompanying drawings. Example

[0027] The present application discloses an ultrasonic scanning water removal mechanism, referring to Figure 1 and Figure 2, including a casing 1. A wind casing 2 connected to the interior of the casing 1 is fixed at the middle position on the top of the casing 1, and a blowing mechanism is installed in the wind casing 2. A conveyor belt 3 for conveying a jig 8 is horizontally provided in the casing 1. The jig 8 is placed on the conveyor belt 3 for transportation. When the jig 8 is transported to the wind casing 2, the blowing mechanism blows air to remove water from the jig 8. A concave water collecting trough 15 is provided at the bottom of the casing 1, and a drain pipe 16 is provided at the bottom of the water collecting trough 15. The water blown off the jig 8 is collected in the water collecting trough 15 and finally discharged through the drain pipe 16.

[0028] Reference Figure 1 and Figure 2 A feed port 11 and a discharge port 12 are formed at both ends of the wind housing 2 at the top of the casing 1. A feed baffle 13 and a discharge baffle 14 are slidably connected at the feed port 11 and the discharge port 12 at the top of the casing 1. The conveyor belt 3 transports the jig 8 from the feed port 11 to the discharge port 12.

[0029] Reference Figure 1 and Figure 2 The conveyor belt 3 includes an inlet belt 31 and an outlet belt 32 with the same conveying direction, with a gap 33 between the inlet belt 31 and the outlet belt 32. The inlet belt 31 and the outlet belt 32 each include a plurality of conveyor rollers 34 and a belt 35 sleeved around the conveyor rollers 34. A blower mechanism is installed in the gap 33 to blow air to the jig 8.

[0030] Reference Figure 1 and Figure 2 The blowing mechanism includes a blowing pipe 41 arranged vertically downward and a horizontal blowing pipe 47 arranged horizontally. The horizontal blowing pipe 47 is slightly higher than the conveyor belt 3, and the blowing pipe 41 is located above the horizontal blowing pipe 47. Both the horizontal blowing pipe 47 and the blowing pipe 41 are located above the gap 33. The blowing pipe 41 is arranged in a conical shape, and the diameter of the upper end of the blowing pipe 41 is smaller than the diameter of the lower end. When the jig 8 is conveyed to the gap 33, the horizontal blowing pipe 47 blows air to remove water from the side of the jig 8, and the blowing pipe 41 blows air to remove water from the upper surface of the jig 8.

[0031] Reference Figures 1 to 3 A mounting base 44 is fixed within the air housing 2. A reciprocating base 45 is horizontally slidably connected to the mounting base 44, sliding in a direction parallel to the conveying direction of the conveyor belt 3. The air blower 41 is mounted on the reciprocating base 45. A reciprocating roller 42 is rotatably connected within the air housing 2. The reciprocating roller 42 is connected to one of the conveyor rollers 34 via a transmission belt 43. A connecting rod 46 is hingedly connected to the edge of the reciprocating tube. The end of the connecting rod 46 away from the reciprocating roller 42 is hingedly connected to the reciprocating base 45.

[0032] Reference Figures 1 to 3When the conveyor belt 3 transports the jig 8, all the conveyor rollers 34 rotate, and the conveyor rollers 34 drive the reciprocating rollers 42 to rotate through the transmission belt 43. The reciprocating rollers 42 drive the reciprocating seat 45 to slide linearly back and forth through the connecting rod 46, thereby driving the blowing pipe 41 to slide left and right continuously, thereby increasing the blowing range of the blowing pipe 41 and improving the water removal effect.

[0033] Reference Figures 2 to 4 A clamping mechanism for clamping the jig 8 and driving the jig 8 to tilt is provided in the casing 1. The clamping mechanism tilts and clamps the jig 8. When the blowing pipe 41 blows air to the jig 8, the moisture on the surface of the jig 8 can slide off the jig 8 faster, thereby improving the water removal efficiency.

[0034] Reference Figures 2 to 4 The clamping mechanism includes an inclined lower plate 51 and an inclined upper plate 61. The inclined lower plate 51 is vertically slidably connected to the gap 33, and the inclined upper plate 61 is vertically slidably connected to the side of the wind housing 2 near the feed port 11. The inclined lower plate 51 and the inclined upper plate 61 are parallel to each other, and the distance between them is equal to the length of the jig 8, thereby clamping the jig 8.

[0035] Reference Figures 2 to 4 The upper end of the inclined lower plate 51 is provided with a limiting step 511 that cooperates with the end of the jig 8, and the lower end of the inclined upper plate 61 is provided with a clamping step 611 that cooperates with the end of the jig 8. The jig 8 has clamping holes 81 at both ends for clamping and transportation, and the limiting step 511 is provided with a clamping block 512 that cooperates with the clamping hole 81.

[0036] Reference Figures 2 to 4 Before the jig 8 moves to the gap 33, the inclined lower plate 51 moves upward and extends from the gap 33 to block the jig 8. The jig 8 contacts the limiting step 511, and the clamping block 512 is inserted into the clamping hole 81. The inclined lower plate 51 moves downward, and the clamping step 611 contacts the other end of the jig 8, and the two clamp the jig 8.

[0037] Reference Figures 2 to 4 A limit cylinder 52 is vertically positioned within gap 33. The output shaft of the limit cylinder 52 is connected to a limit seat 53, to which a rotating plate 7 is rotatably connected. The rotating plate 7 comprises a rotating lower plate 72 and a rotating upper plate 71. The lower end of the rotating lower plate 72 is rotatably connected to the limit seat 53, and the tilting lower plate 51 is fixed to the rotating lower plate 72. The output shaft of the limit cylinder 52 extends and retracts, driving the tilting lower plate 51 to slide up and down via the rotating lower plate 72.

[0038] Reference Figures 2 to 4 The upper end of the rotating lower plate 72 is fixed with a telescopic rod 73, and the upper end of the telescopic rod 73 is connected to the lower end of the upper plate of the rotating plate 7. The rotating upper plate 71 is rotatably connected to the wind housing 2. When the rotating lower plate 72 slides up and down, the rotating upper plate 71 is not affected.

[0039] Reference Figures 2 to 4 A clamping cylinder 62 is fixed to one end of the rotating upper plate 71 close to the feed port 11, and the output shaft of the clamping cylinder 62 faces the conveyor belt 3 and is fixedly connected to the inclined upper plate 61. The output shaft of the clamping cylinder 62 is extended and retracted to drive the inclined upper plate 61 to slide up and down.

[0040] Reference Figures 2 to 4 The end of the wind housing 2 near the feed inlet 11 is rotatably connected to the rotating cylinder 74, and the output shaft of the rotating cylinder 74 is hingedly connected to the end of the rotating upper plate 71 near the feed inlet 11. The output shaft of the rotating cylinder 74 is extended and retracted, driving the rotating upper plate 71 to rotate.

[0041] Reference Figure 5 and Figure 6 The wind housing 2 is provided with a plurality of arcuate slots 21 that follow the same motion path as the rotating upper plate 71. Positioning blocks 711 are fixed to the rotating upper plate 71 and are slidably connected to the arcuate slots 21. The positioning blocks 711 and the arcuate slots 21 cooperate with each other to define and guide the rotation path of the rotating upper plate 71, thereby improving the stability of the rotating upper plate 71.

[0042] The ultrasonic scanning dewatering mechanism of the present embodiment is implemented as follows: an operator or a manipulator places the jig 8 onto the feed belt 31 through the feed port 11. The feed baffle 13 and the discharge baffle 14 close, sealing the housing. The output shaft of the limit cylinder 52 extends, and the inclined lower plate 51 extends vertically from the gap 33, with the limit step 511 flush with the end face of the jig 8. The feed belt 31 conveys the jig 8 toward the discharge belt 32 until the jig 8 contacts the limit step 511, and the clamping block 512 is inserted into the clamping hole 81.

[0043] At this time, the output shaft of the clamping cylinder 62 extends, and the inclined lower plate 51 moves downward until the clamping step 611 contacts the end surface of the fixture 8 away from the limiting step 511 .

[0044] The output shaft of the rotating cylinder 74 gradually extends, and the rotating upper plate 71 gradually rotates toward the discharge port 12. Since the rotating upper plate 71 and the rotating lower plate 72 are connected by the telescopic rod 73, the rotation of the rotating upper plate 71 will drive the rotating lower plate 72 to rotate synchronously. As a result, the inclined lower plate 51 and the inclined upper plate 61 rotate synchronously toward the discharge port 12.

[0045] Due to the cooperation between the clamping block 512 and the clamping hole 81, the jig 8 will rotate synchronously with the inclined lower plate 51 and the inclined upper plate 61 during the rotation, so that the end of the jig 8 close to the feed port 11 gradually becomes higher than the other end, the jig 8 gradually becomes inclined, and the lower surface of the jig 8 gradually separates from the conveyor belt 3.

[0046] After the output shaft of the rotating cylinder 74 is fully extended, the inclined upper plate 61 , the fixture 8 , and the inclined lower plate 51 are all in an inclined state, and the sample on the upper surface of the fixture 8 is facing the blowing pipe 41 .

[0047] At this time, the conveyor belt 3 continues to operate, and the conveyor roller 34 drives the reciprocating roller 42 to rotate via the transmission belt 43. The reciprocating roller 42 causes the reciprocating seat 45 to slide back and forth, and the blow pipe 41 follows the left and right reciprocating motion. The blow pipe 41 blows air vertically downward toward the upper surface of the jig 8, removing moisture from the upper surface of the jig 8. The horizontal blow pipe 47 removes moisture from the sides of the jig 8. Under the blowing of the blow pipe 41, the water on the upper surface of the jig 8 slides downward along the surface of the jig 8 and slides off the upper surface of the jig 8, thereby removing moisture from the jig 8.

[0048] After moisture removal is complete, the output shaft of the rotating cylinder 74 retracts, and the jig 8 regains its horizontal position and contacts the conveyor belt 3. The output shaft of the clamping cylinder 62 retracts, and the inclined upper plate 61 separates from the jig 8. The conveyor belt 3 reverses, and the jig 8 separates from the inclined lower plate 51. The output shaft of the limiting cylinder 52 retracts, and the inclined lower plate 51 retracts into the gap 33.

[0049] The conveyor belt 3 rotates forward, and the jig 8 is transported from the inlet belt 31 to the outlet belt 32. The blowing pipe 41 and the cross blowing pipe 47 continue to blow air to remove water from the jig 8 until the jig 8 moves to the discharge port 12. The discharge baffle 14 opens the discharge port 12, and the operator or robot removes the jig 8 to complete the water removal.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An ultrasonic scanning water removal mechanism, comprising a housing (1), characterized in that: A wind shell (2) is fixed at the middle position of the top of the casing (1), and a feed port (11) and a discharge port (12) are formed at both ends of the wind shell (2) on the top of the casing (1). A feed baffle (13) and a discharge baffle (14) are slidably connected at the feed port (11) and the discharge port (12) on the top of the casing (1). A conveyor belt (3) for conveying from the feed port (11) to the discharge port (12) is provided in the casing (1), and a plurality of vertical downward blowing pipes (41) are provided in the wind shell (2). The blowing pipes (41) are tapered, and the upper end diameter of the blowing pipes (41) is smaller than the lower end diameter. The conveyor belt (3) includes an inlet belt (31) and an outlet belt (32) with the same conveying direction, a gap (33) is left between the inlet belt (31) and the outlet belt (32), the blowing pipe (41) is opposite to the gap (33), and an inclined lower plate (51) is vertically slidably connected in the gap (33), and the upper end of the inclined lower plate (51) is provided with a limiting step (511) that matches the end of the jig (8), and an inclined upper plate (61) is vertically slidably connected at one end of the wind shell (2) near the feed port (11), and the lower end of the inclined upper plate (61) is provided with a clamping step (611) that matches the end of the jig (8).

2. The ultrasonic scanning water removal mechanism according to claim 1, characterized in that: A limit cylinder (52) is vertically provided in the gap (33); an output shaft of the limit cylinder (52) is connected to a limit seat (53); a rotating plate (7) is rotatably connected to the limit seat (53); the inclined lower plate (51) is fixedly connected to the lower end of the rotating plate (7); the upper end of the rotating plate (7) is located in the wind housing (2) and is provided with a clamping cylinder (62); and the inclined upper plate (61) is connected to the output shaft of the clamping cylinder (62).

3. The ultrasonic scanning water removal mechanism according to claim 2, characterized in that: Clamping holes (81) for clamping and transporting are provided at both ends of the jig (8), and a clamping block (512) matching with the clamping hole (81) is provided on the limiting step (511).

4. The ultrasonic scanning water removal mechanism according to claim 2, characterized in that: The rotating plate (7) comprises a rotating lower plate (72) and a rotating upper plate (71); the rotating lower plate (72) is rotatably connected to the limiting seat (53); the inclined lower plate (51) is fixedly connected to the rotating lower plate (72); a telescopic rod (73) is fixed to the rotating lower plate (72); the upper end of the telescopic rod (73) is connected to the rotating upper plate (71); the clamping cylinder (62) is connected to the rotating upper plate (71); a rotating cylinder (74) is rotatably connected in the wind shell (2); the output shaft of the rotating cylinder (74) is rotatably connected to the end of the rotating upper plate (71) close to the clamping cylinder (62).

5. The ultrasonic scanning water removal mechanism according to claim 4, characterized in that: A plurality of arc-shaped grooves (21) having the same movement path as the rotating upper plate (71) are provided in the wind shell (2), and a positioning block (711) slidably connected to the arc-shaped grooves (21) is fixed on the rotating upper plate (71).

6. The ultrasonic scanning water removal mechanism according to claim 1, characterized in that: The conveyor belt (3) includes a plurality of conveying rollers (34) and a belt (35) sleeved on the outside of the conveying rollers (34). A reciprocating roller (42) is rotatably connected in the wind housing (2). The reciprocating roller (42) is connected to one of the conveying rollers (34) through a transmission belt (43). A mounting seat (44) is inherently provided in the wind housing (2). A reciprocating seat (45) is horizontally slidably connected to the mounting seat (44). The blowing pipe (41) is fixedly connected to the reciprocating seat (45). A connecting rod (46) is hinged on the edge of the reciprocating roller (42). The end of the connecting rod (46) away from the reciprocating roller (42) is hingedly connected to the reciprocating seat (45).

7. The ultrasonic scanning water removal mechanism according to claim 1, characterized in that: A horizontal blowing pipe (47) is provided in the wind housing (2) and is located below the blowing pipe (41).

8. The ultrasonic scanning water removal mechanism according to claim 1, characterized in that: A concave water collecting tank (15) is provided at the bottom of the casing (1), and a drainage pipe (16) is provided at the bottom of the water collecting tank (15).

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