Automatic water-absorbing sand washing machine

Abstract

The invention discloses an automatic water-absorbing sand washing machine, comprising a water-washing wheel assembly, a driving device and a water-washing tank. The water-washing wheel assembly is formed by welding a plurality of sand-digging buckets and water-leakage baffles. The driving device comprises a motor, a main shaft and a connecting shaft. The sand-digging bucket comprises a bottom plate, a connecting plate, a wear-resistant steel plate and a side wall baffle. The bottom plate is in a V-shaped plate shape with two side walls, one high and one low. The bottom of the bottom plate is curved in an arc shape. The bottom of the bottom plate is densely covered with water seepage holes. The ends of the two side walls of the bottom plate are respectively connected to the connecting plates by bolts. The upper ends of the two connecting plates are respectively connected to the wear-resistant steel plates by bolts. Side wall baffles are welded to the front and rear sides of the bottom plate. The two side wall baffles are respectively welded to the wear-resistant steel plate, the connecting plate and the two side surfaces of the bottom plate as a whole. The top ends of the water-leakage baffles on the two sides are respectively welded to the side wall baffles on the two sides of the sand-digging bucket. When the water-washing wheel assembly rotates, a vacuum cavity is formed between the bottom of the sand-digging bucket, the water-leakage baffles on the two sides of the sand-digging bucket and the water surface.

Description

Technical Field

[0001] The invention relates to the technical field of sand and gravel washing, in particular to an automatic water-absorbing sand washing machine. Background Art

[0002] At present, in the field of sand and gravel washing technology in my country, water washing wheels are commonly used washing equipment. The water washing wheels in the existing market also use sand buckets to achieve water-sand separation through the principle of water seepage through small holes at the bottom. The sand washed in this way has a high water content. To reduce the water content, the speed of the water washing wheel can only be reduced. The purpose of removing water from the sand can be achieved by lengthening the seepage time. The direct consequence of reducing the speed is reduced productivity and reduced output per unit time, which in turn causes increased costs. Summary of the invention

[0003] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide an automatic water-absorbing sand washing machine to solve the problems raised in the background technology.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides an automatic water-absorbing sand washing machine, comprising a water-washing wheel assembly, a driving device and a water-washing tank, wherein the water-washing wheel assembly is welded by a plurality of sand-digging buckets and water-leakage baffles, the driving device comprises a motor, a main shaft and a connecting shaft, the sand-digging bucket comprises a bottom plate, a connecting plate, a wear-resistant steel plate and a side wall baffle, the bottom plate is in a V-shaped plate shape with two side walls, one high and one low, the bottom of the bottom plate is curved in an arc shape, the bottom of the bottom plate is densely covered with water seepage holes, the two side wall ends of the bottom plate are respectively connected to the connecting plate by bolts, the upper ends of the two connecting plates are respectively connected to the wear-resistant steel plate by bolts, the front and rear sides of the bottom plate are welded with side wall baffles, the two side wall baffles are respectively welded to the wear-resistant steel plate, the connecting plate and the two side surfaces of the bottom plate as a whole, the middle part of the top of the water-leakage baffle is opened in an arc shape, and the top of the water-leakage baffle and the bottom of the side wall baffle are shaped The shapes are adapted to each other, the top ends of the leakage baffles on both sides are respectively welded to the side wall baffles on both sides of the sand dredging bucket, the end of the leakage baffle away from the main shaft is bent to the right, the angle of the leakage baffle to the right is 160-170°, the sides of two adjacent leakage baffles are welded and connected, a plurality of the leakage baffles are arranged circumferentially with the main shaft as the center, a plurality of the leakage baffles are welded and connected to the sand dredging bucket as one body to form a water washing wheel assembly, after the plurality of the leakage baffles are welded as one body, the bottom ends of the leakage baffles are connected to form a circle, the bottom ends of the leakage baffles are welded with connecting pieces at equal angles with the main shaft as the center, the connecting piece is bolted to the end of the connecting shaft away from the main shaft, the end of the connecting shaft away from the connecting piece is bolted to the main shaft, and when the water washing wheel assembly rotates, a vacuum cavity is formed between the leakage baffles on the bottom of the sand dredging bucket and the water surface on both sides of the sand dredging bucket.

[0006] Preferably, a water inlet box is installed on one side of the water washing tank, and a sand collecting box is installed on the other side of the water washing tank. Overflow baffles are welded to the inner walls of the water washing tank on both adjacent sides of the water inlet box. The overflow baffles and the inner wall of the water washing tank form an overflow groove. A drainage groove is welded to the outer wall of the water washing tank corresponding to the overflow groove. A supporting square tube is vertically welded in the drainage groove on both sides of the water washing tank, and a supporting box is welded to the top of the supporting square tube.

[0007] Preferably, the overflow trough is welded 20-30 cm below the upper surface of the washing tank.

[0008] Preferably, a reducer and a motor are installed at the top of the drainage trough on either side of the washing tank, the motor and the reducer are connected through a V-belt transmission, the reducer and the main shaft are connected through a coupling transmission, bucket wheel bearings are installed at both ends of the main shaft, the bucket wheel bearings are located in a support box, and the main shaft is fixed to the top of a supporting square tube through a support box.

[0009] Preferably, the number of the water seepage holes is 200-300, and the diameter of the water seepage holes is 3-8 mm.

[0010] Preferably, the width of the drainage groove near one end of the water inlet tank is greater than the width of the other end of the drainage groove, the width of the overflow groove near the inner wall of the water washing tank is greater than the width of the other end of the overflow groove, the longitudinal cross-section of the overflow groove and the drainage groove is a right-angled trapezoid, a plurality of overflow holes 1 are horizontally opened between the drainage groove and the overflow groove, the drainage groove and the overflow groove are connected to each other through the overflow hole 1, and a plurality of overflow holes 2 are horizontally opened on a side of the overflow groove away from the inner wall of the water washing tank, and the aperture of the overflow hole 2 is larger than that of the overflow hole 1.

[0011] Preferably, a base is welded to the bottom of the water washing tank, a supporting square tube 2 is welded to the wall between the reducer and the base, and a horizontal reinforcement plate and a vertical reinforcement plate are welded to the outer wall of the water washing tank.

[0012] Preferably, a water inlet is provided on the side of the water inlet box away from the water washing tank, and a sand discharge port is provided at the bottom of the sand collecting box.

[0013] Preferably, a top end of the supporting square tube is higher than an upper surface of the water washing tank.

[0014] The beneficial effects of the present invention are:

[0015] 1. The mud-sand mixture enters the washing tank through the water inlet tank. Due to the stirring action of the washing wheel assembly, the sand settles at the bottom of the washing tank, the mud is mixed in the water, and the sand at the bottom is scooped up through the sand dredging bucket. When the sand dredging bucket rotates out of the water surface, the bottom of the sand dredging bucket is densely covered with water seepage holes. Under the action of gravity, the water in the sand flows out through the water seepage holes. At the same time, when the sand dredging bucket rotates out of the water surface, a vacuum cavity is formed between the leakage baffle and the water surface. The pressure in the vacuum cavity is less than the atmospheric pressure above the water surface, and suction is generated in the vacuum cavity. Due to the vacuum suction action, the suction of water in the sand is strengthened, thereby reducing the water content in the sand. The sand washing machine of the present invention reduces the water content in the sand without reducing the rotation speed.

[0016] 2. A wear-resistant steel plate is installed on the upper end of the connecting plate in the sand dredging bucket. When the sand dredging bucket rotates, the sand is scooped up by the wear-resistant steel plate to reduce the damage caused by the sand to the sand dredging bucket. At the same time, the wear-resistant steel plate is fixed to the connecting plate by bolts for easy replacement.

[0017] 3. Horizontal reinforcement plates and vertical reinforcement plates are welded on the outer wall of the water washing tank. At the same time, three supporting square tubes are welded on the water washing tank to enhance the stability of the water washing tank.

[0018] 4. The main shaft and the connecting shaft are fixed by bolts, and the connecting shaft and the washing wheel assembly are fixed by bolts, which is convenient for disassembly, transportation and maintenance.

[0019] 5. The width of one end of the drainage trough close to the water inlet tank is greater than the width of the other end of the drainage trough. The width of the overflow trough close to the inner wall of the water washing tank is greater than the width of the other end of the overflow trough. Overflow hole 1 and overflow hole 2 are provided on the overflow trough and the drainage trough to facilitate the discharge of muddy water in the water washing tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a front view of the sand washing machine of the present invention;

[0022] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0023] Figure 3 This is a left side view of the sand washing machine of the present invention;

[0024] Figure 4 It is a partial structural schematic diagram of the water washing wheel assembly of the sand washing machine of the present invention;

[0025] Figure 5 for Figure 4 Enlarged schematic diagram of middle C part;

[0026] Figure 6 for Figure 2 Cross-sectional view of drainage trough in the middle B direction;

[0027] Figure 7 for Figure 2 Cross-sectional view of the drainage trough in the middle A direction;

[0028] Figure 8 Schematic diagram of the sand bucket movement process.

[0029] Description of reference numerals:

[0030] 1-water washing tank, 2-support square tube one, 3-water inlet box, 31-water inlet, 4-sand collecting box, 41-sand outlet, 5-overflow baffle, 51-side baffle, 6-overflow trough, 7-support square tube two, 8-support box, 9-drainage trough, 91-drainage outlet, 10-motor, 11-reducer, 12-V-belt, 13-spindle, 14-bucket wheel bearing, 15-connecting shaft, 16-sand bucket, 161-bottom plate, 162-connecting plate, 163-wear-resistant steel plate, 164-seepage hole, 165-side wall baffle, 17-leakage baffle, 18-connecting piece, 19-overflow hole one, 20-overflow hole two, 21-base, 22-support square tube three, 23 horizontal reinforcement plate, 24-vertical reinforcement plate, 25-vacuum chamber. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] Example:

[0034] like Figure 1-8As shown, the present invention provides an automatic water-absorbing sand washing machine, comprising a water washing tank 1, a driving device and a water washing wheel assembly, wherein the upper ends of the front and rear side walls of the water tank 1 are horizontally symmetrically welded with supporting square tubes 2, an upper end of one side of the water washing tank 1 is welded with a water inlet box 3, and the water inlet box 3 is located between the front and rear two supporting square tubes 2, and a sand collecting box 4 is welded to the outer wall of the water washing tank 1 on one side opposite to the water inlet box 3, and the upper parts of the front and rear inner walls of the water washing tank 1 are respectively welded with a plurality of overflow baffles 5 tilted upward, and two adjacent overflow baffles 5 are connected by welding, and a side baffle 51 is vertically welded to one end of the plurality of overflow baffles 5 away from the water washing tank 1, so that two overflow grooves 6 are formed between the front and rear inner walls of the water washing tank 1 and the overflow baffle 5 and the side baffle 51, and the height of the side baffle 51 is lower than that of the water washing tank 1.

[0035] Two supporting square tubes 2 7 are vertically welded on both sides of the bottom of the water washing tank 1. The two supporting square tubes 2 7 pass through the overflow groove 6 and are vertically welded to the supporting square tube 1 2. Support boxes 8 are welded on the upper surfaces of the two supporting square tubes 1 2. The two supporting boxes 8 are located directly above the supporting square tube 2 7. Drainage grooves 9 are respectively welded on the front and rear outer walls of the water washing tank 1. The two drainage grooves 9 are respectively connected to the two overflow grooves 6;

[0036] The driving device includes a motor 10, a reducer 11, a main shaft 13 and a connecting shaft 15. The motor 10 and the reducer 11 are fixedly installed at the upper end of the drainage groove 9 on either side. The motor 10 and the reducer 11 are connected to each other through a V-belt 12. The reducer 11 and the main shaft 13 are connected to each other through a coupling. Bucket wheel bearings 14 are installed at both ends of the main shaft 13. The bucket wheel bearings 14 are fixed on the support box 8. A water washing wheel assembly is fixed on the main shaft 13. The main shaft 13 is connected to the water washing wheel assembly through six connecting shafts 15 arranged at equal angles on the circumference on both sides of the water washing wheel assembly. The connecting shaft 15 is bolted to the main shaft 13.

[0037] The washing wheel assembly is welded by a plurality of circumferentially arranged sand dredging buckets 16 and water leakage baffles 17. The sand dredging bucket 16 includes a bottom plate 161, a connecting plate 162, a wear-resistant steel plate 163 and a side wall baffle 165. The bottom plate 161 is in a V-shaped plate shape with one high and one low side wall. The bottom of the bottom plate 161 is curved in an arc shape. The bottom of the bottom plate 161 is densely covered with water seepage holes 164. The ends of the two side walls of the bottom plate 161 are respectively connected to the connecting plate 162 by bolts. The upper ends of the connecting plates 162 are connected to the wear-resistant steel plates 163 by bolts, and the front and rear sides of the bottom plate 161 are welded with side wall baffles 165. The two side wall baffles 165 are welded to the wear-resistant steel plates 163, the connecting plates 162 and the two side surfaces of the bottom plate 161 as a whole. The side wall baffles 165 are adapted to the side edge shapes of the bottom plate 161, the connecting plates 162 and the wear-resistant steel plates 163. The multiple sand dredging buckets 16 are connected by the connecting plates 162.

[0038] The middle part of the top of the water leakage baffle 17 is opened in an arc shape, the top of the water leakage baffle 17 is adapted to the bottom shape of the side wall baffle 165, the tops of the water leakage baffles 17 on both sides are respectively welded to the side wall baffles 165 on both sides of the sand dredging bucket 16, the end of the water leakage baffle 17 away from the main shaft 13 is bent to the right, the angle of the water leakage baffle 17 bent to the right is 160-170°, the sides of two adjacent water leakage baffles 17 are welded, the water leakage baffle 17 and the side wall baffle 165 are located on the same vertical plane, and multiple water leakage baffles 17 The plurality of water leakage baffles 17 are arranged in a circle with the main shaft 13 as the center, and are welded and connected to the sand dredging bucket 16 as a whole to form a water washing wheel assembly. After the plurality of water leakage baffles 17 are welded as a whole, the bottom ends of the water leakage baffles 17 are connected to form a circle, and the bottom ends of the water leakage baffles 17 are welded with connecting members 18 at equal angles with the main shaft 13 as the center. The connecting member 18 is bolted to one end of the connecting shaft 15 away from the main shaft 13. When the water washing wheel assembly rotates, a vacuum cavity 25 is formed between the water leakage baffles 17 at the bottom of the sand dredging bucket 16 and on both sides of the sand dredging bucket 16 and the water surface.

[0039] Furthermore, the number of the water seepage holes 164 is 200-300, and the diameter of the water seepage holes 164 is 3-8 mm.

[0040] Furthermore, one end of the drainage groove 9 close to the water inlet tank 3 is higher than the other end of the drainage groove 9, the height of the overflow groove 6 close to the inner wall of the washing tank 1 is greater than the height of the other side of the overflow groove 6, and the longitudinal cross-section of the overflow groove 6 and the drainage groove 9 is a right-angled trapezoid.

[0041] Furthermore, a plurality of overflow holes 19 are horizontally opened between the overflow groove 6 and the drainage groove 9, the drainage groove 9 and the overflow groove 6 are interconnected through the overflow hole 19, and a plurality of overflow holes 20 are horizontally opened on the side of the inner wall of the overflow groove 6 away from the washing tank 1, and the aperture of the overflow hole 20 is larger than that of the overflow hole 19.

[0042] Furthermore, the overflow baffle 5 is welded 20-30 cm below the upper surface of the washing tank.

[0043] Furthermore, a base 21 is welded to the bottom of the water washing tank 1 , and a supporting square tube 22 is welded to the wall between the reducer 11 and the base 21 .

[0044] Furthermore, the water inlet box 3 is provided with a water inlet 31 on the side away from the washing tank 1 , the sand collecting box 4 is provided with a sand discharge port 41 at the bottom, and the end face of the drainage groove 9 on the same side as the water inlet box 3 is provided with a drainage port 91 .

[0045] Furthermore, a horizontal reinforcement plate 23 and a vertical reinforcement plate 24 are welded to the outer wall of the water washing tank 1 .

[0046] Furthermore, the top of the supporting square tube 2 7 is higher than the upper surface of the water washing tank 1 .

[0047] Working principle:

[0048] When the automatic water-absorbing sand washing machine of the present invention is working, the mud-sand mixture is continuously injected into the water washing tank 1 through the water inlet tank 3, the motor 10 drives the reducer 11 to work through the V-belt 12, and the reducer 11 drives the main shaft 13 to rotate, and the main shaft 13 is connected to the water washing wheel assembly through the connecting shaft 15, Figure 1 and Figure 8 The washing wheel assembly starts to rotate clockwise. Due to the stirring effect of the washing wheel assembly, sand is deposited at the bottom of the washing tank 1, and mud is mixed in the water. The sand at the bottom of the washing tank 1 is scooped up through the sand dredging bucket 16. The washing wheel assembly rotates out of the water surface. The muddy water in the sand dredging bucket 16 is discharged through the seepage holes 164 due to gravity. The seepage holes 164 cover the bottom of the sand dredging bucket 16. The number of the seepage holes 164 is 200-300, and the aperture of the seepage holes 164 is 3-8 mm. The number and aperture of the holes 164 are set according to production requirements. At the same time, the muddy water in the washing pool flows into the overflow trough 6 through the overflow hole 20 on the overflow trough 6, and then flows into the drainage trough 9 through the overflow hole 19, and is discharged through the drainage port 91. Since the widths of the two ends of the drainage trough 9 are inconsistent, the muddy water can be discharged quickly. When it rotates to one side of the sand collecting box 4, due to the gravity of the sand itself, the sand slides out of the sand bucket 16 and flows into the sand collecting box 4, and is transported out through the sand discharge port 41.

[0049] refer to Figure 8 In the process of muddy water in the sand being discharged through the seepage holes 164, each sand dredging bucket 16 rotates one by one to separate from the water surface. In the process of a sand dredging bucket 16 separating from the water surface, a vacuum cavity 25 is formed between the sand dredging bucket 16, the water leakage baffle 17 and the water surface. The pressure in the vacuum cavity 25 is less than the atmospheric pressure above the water surface. Suction is generated in the vacuum cavity 25. Due to the effect of the vacuum suction, the suction of water in the sand is strengthened. After the sand dredging bucket 16 separates from the water surface, the vacuum suction disappears, and the muddy water continues to be discharged through the seepage holes 164 by its own gravity, thereby reducing the water content in the sand as a whole. The length of the water leakage baffle 17 is determined by the diameter of the water washing wheel assembly and is manufactured according to production requirements. The longer the length of the water leakage baffle 17, the longer the time for the vacuum cavity 25 to generate suction, and the lower the water content of the sand.

[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An automatic water-absorbing sand washing machine, comprising a water-washing wheel assembly, a driving device and a water-washing tank, characterized in that: The washing wheel assembly is welded by a plurality of circumferentially arranged sand dredging buckets and water leakage baffles. The driving device comprises a motor, a reducer, a main shaft and a connecting shaft. The sand dredging bucket comprises a bottom plate, a connecting plate, a wear-resistant steel plate and a side wall baffle. The bottom plate is in the shape of a V-shaped plate with one high and one low side wall. The bottom of the bottom plate is curved in an arc shape. The bottom of the bottom plate is densely covered with water seepage holes. The ends of the two side walls of the bottom plate are respectively connected to the connecting plate by bolts. The upper ends of the two connecting plates are respectively connected to the wear-resistant steel plate by bolts. Side wall baffles are welded on the front and rear sides of the bottom plate. The two side wall baffles are respectively welded to the wear-resistant steel plate, the connecting plate and the two side surfaces of the bottom plate as a whole. The middle part of the top of the water leakage baffle is opened in an arc shape. The top of the water leakage baffle is adapted to the bottom shape of the side wall baffle. The tops of the water leakage baffles on both sides are respectively connected to The side wall baffles on both sides of the sand dredging bucket are welded and connected, and the end of the water leakage baffle away from the main shaft is bent to the right, and the angle of the water leakage baffle to the right is 160-170°. The sides of two adjacent water leakage baffles are welded and connected, and the water leakage baffle and the side wall baffle are located on the same vertical plane. A plurality of the water leakage baffles are arranged circumferentially with the main shaft as the center, and a plurality of the water leakage baffles are welded and connected to the sand dredging bucket as a whole to form a water washing wheel assembly. After the plurality of the water leakage baffles are welded as a whole, the bottom ends of the water leakage baffles are connected to form a circle, and the bottom ends of the water leakage baffles are welded with connecting pieces at equal angles with the main shaft as the center, and the connecting pieces are bolted to the end of the connecting shaft away from the main shaft, and the connecting shaft is bolted to the main shaft. When the water washing wheel assembly rotates, a vacuum cavity is formed between the bottom of the sand dredging bucket, the water leakage baffles on both sides of the sand dredging bucket and the water surface; A water inlet box is installed on one side of the water washing tank, and a sand collecting box is installed on the other side of the water washing tank. Overflow baffles are welded on the inner walls of the water washing tank on both sides of the water inlet box. The overflow baffles and the inner wall of the water washing tank form an overflow groove. A drainage groove is welded on the outer wall of the water washing tank corresponding to the overflow groove. A supporting square tube 1 is vertically welded in the drainage groove on both sides of the water washing tank, and a supporting box is welded on the top of the supporting square tube 1. The width of the drainage groove near one end of the water inlet tank is greater than the width of the other end of the drainage groove, the width of the overflow groove near the inner wall of the water washing tank is greater than the width of the other end of the overflow groove, the longitudinal cross-sections of the overflow groove and the drainage groove are right-angled trapezoids, a plurality of overflow holes 1 are horizontally opened between the drainage groove and the overflow groove, the drainage groove and the overflow groove are connected to each other through the overflow hole 1, and a plurality of overflow holes 2 are horizontally opened on a side of the overflow groove away from the inner wall of the water washing tank, and the aperture of the overflow hole 2 is greater than that of the overflow hole 1.

2. The automatic water-absorbing sand washing machine according to claim 1, characterized in that: The overflow trough is welded 20-30 cm below the upper surface of the washing pool.

3. The automatic water-absorbing sand washing machine according to claim 1, characterized in that: A reducer and a motor are installed at the top of the drainage trough on either side of the washing tank. The motor and the reducer are connected through a V-belt transmission, and the reducer and the main shaft are connected through a coupling transmission. Bucket wheel bearings are installed at both ends of the main shaft, and the bucket wheel bearings are located in a support box. The main shaft is fixed to the top of a supporting square tube through a support box.

4. The automatic water-absorbing sand washing machine according to claim 1, characterized in that: The number of the water seepage holes is 200-300, and the diameter of the water seepage holes is 3-8 mm.

5. The automatic water-absorbing sand washing machine according to claim 1, characterized in that: A base is welded to the bottom of the water washing tank, a supporting square tube 2 is welded to the wall between the reducer and the base, and a horizontal reinforcement plate and a vertical reinforcement plate are welded to the outer wall of the water washing tank.

6. The automatic water-absorbing sand washing machine according to claim 1, characterized in that: A water inlet is arranged on the side of the water inlet box away from the water washing tank, and a sand discharge port is arranged at the bottom of the sand collecting box.

7. The automatic water-absorbing sand washing machine according to claim 1, characterized in that: A top end of the supporting square tube is higher than the upper surface of the water washing tank.

Images