Cleaning machine and cleaning method

Abstract

The cleaning machine comprises a box body, an inner water pipe, a middle-layer spraying arm and a top-layer spraying arm, and further comprises an adjusting mechanism which can enlarge the water inlet area of the middle-layer spraying arm along with the increase of water flow and reduce the water inlet area of the middle-layer spraying arm along with the decrease of the water flow, the adjusting mechanism is arranged in the inner water pipe and located at the joint of the middle-layer spraying arm and the inner water pipe. The adjusting mechanism adjusts the inlet area of the middle-layer spraying arm in a self-adaptive manner according to the water flow in the inner water pipe, and the inner water pipe only supplies water to the middle-layer spraying arm and the top-layer spraying arm, so that self-adaptive distribution of the water supply amount of the middle-layer spraying arm and the top-layer spraying arm can be realized by adjusting the inlet area of the middle-layer spraying arm; therefore, stable water supply of the middle-layer spraying arm and the top-layer spraying arm can be achieved by controlling the water supply amount of the water pump according to actual cleaning requirements, and the cleaning effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of dishwashers, and in particular to a washing machine for washing tableware, fruits and vegetables. Background Art

[0002] As people's living standards continue to improve, dishwashers, as a kitchen appliance, are entering more and more households.

[0003] The applicant's prior application CN202011629756.4 "A water flow system and a cleaning machine using the water flow system" discloses a structure using an open water pump and a water flow system, which includes a spray device and a pump for supplying water to the spray device, the spray device includes a bottom spray arm, a middle spray arm, and a top spray arm, the pump includes an upper impeller, a lower impeller, an upper shell, and a lower shell, the upper shell has a first accommodating chamber for installing the upper part of the first blade, the upper part of the lower shell has a second accommodating chamber for installing the lower part of the first blade, a first water inlet is opened on the side wall of the lower shell for supplying water into the second accommodating chamber, the lower part of the lower shell has a third accommodating chamber for installing the lower impeller, and a second water inlet and a water outlet are opened on the side wall and / or bottom wall of the lower shell; the middle spray arm and the top spray arm are both supplied with water through an inner water pipe extending upward close to the inner wall of the washing chamber.

[0004] The power of the two water flows in the above-mentioned washing machine structure is independently supplied by the corresponding pumps, which increases the head and water flow of each water flow, and is conducive to improving the cleaning effect. However, since the internal water pipe divides the upward water flow into two paths, one for the middle spray arm and the other for the top spray arm, the flow cannot be distributed between the two water supply paths, and due to the influence of the upward resistance of the middle spray arm, the middle layer spray force may be strong and the top spray force is seriously insufficient, resulting in poor washing effect when the upper part of the washing chamber also needs to bear a large number of sets of tableware.

[0005] Therefore, for the current cleaning machine structure, further improvement needs to be made. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a cleaning machine capable of allocating the upstream flow rate on demand so as to improve the washing effect of each area in view of the current status of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a cleaning method using the above-mentioned cleaning machine in view of the current status of the prior art.

[0008] The technical solution adopted by the present invention to solve at least one of the above technical problems is:

[0009] A cleaning machine comprises a box body, an inner water pipe, a middle-layer spray arm and a top-layer spray arm, wherein the inner water pipe supplies water upward from the bottom of the box body, the middle-layer spray arm is located in the middle of the box body and is connected to the side of the inner water pipe, the top-layer spray arm is arranged at the top of the box body and is connected to the top of the inner water pipe, and also comprises an adjusting mechanism which can expand the water inlet area of ​​the middle-layer spray arm as the water flow rate increases and reduce the water inlet area of ​​the middle-layer spray arm as the water flow rate decreases, and the adjusting mechanism is arranged in the inner water pipe and is located at the connection between the middle-layer spray arm and the inner water pipe.

[0010] Preferably, a water outlet is provided on the side of the inner water pipe, the middle spray arm is connected to the water outlet through a transversely arranged water guide pipe, and the regulating mechanism is used to control the flow cross-sectional area of ​​the water outlet. The regulating mechanism is arranged here to directly control the flow cross-sectional area of ​​the water outlet through the shortest path.

[0011] Preferably, the side wall of the inner water pipe is provided with a water guide sleeve extending from the water outlet into the water guide pipe, the regulating mechanism comprises a flexible pipe and a clamping assembly, the first end of the flexible pipe is inserted into the water guide sleeve, and the second end is located in the inner water pipe, the clamping assembly is arranged in the inner water pipe and clamped on the outer periphery of the flexible pipe. The flexible pipe can be a corrugated soft rubber pipe to facilitate radial expansion and contraction, and flexible control of the flow cross-sectional area of ​​the water outlet can be achieved with the opening and closing of the clamping assembly.

[0012] Preferably, the clamping assembly can be movably clamped on the outer periphery of the flexible tube, and the clamping assembly is provided with a water-receiving portion arranged toward the incoming water direction. When the water flow rate increases, the water-receiving portion transmits a large force to the clamping assembly to drive the clamping assembly to loosen the flexible tube and increase the flow area of ​​the water outlet; when the water flow rate decreases, the water-receiving portion transmits a small force to the clamping assembly to cause the clamping assembly to clamp the flexible tube and reduce the flow area of ​​the water outlet. With such a structure, the flexible control of the flow cross-sectional area of ​​the water outlet can be achieved as the clamping assembly opens and closes.

[0013] Preferably, the clamping assembly comprises a first clamping arm and a second clamping arm, the middle parts of the first clamping arm and the second clamping arm are respectively rotated and constrained on the front wall of the inner water pipe, the upper part of the first clamping arm forms a first clamping head clamped on one side of the flexible pipe, the upper part of the second clamping arm forms a second clamping head clamped on the second side of the flexible pipe, the water-receiving part is arranged at the lower part of the first clamping arm and the second clamping arm, and the side part of the clamping assembly is also provided with an elastic member connected to the lower part of the first clamping arm and the second clamping arm respectively so as to keep the two in a relatively close trend. With the above structure, when the water flow is small, the force of the elastic member is large, driving the lower ends of the first clamping arm and the second clamping arm to be relatively separated, and the upper ends of the first clamping arm and the second clamping arm will be close to each other, thereby maintaining the diameter of the flexible pipe in a small range; when the water flow increases to a value greater than the force of the elastic member, driving the lower ends of the first clamping arm and the second clamping arm to be relatively close, the upper ends of the first clamping arm and the second clamping arm will be relatively separated, and the diameter of the flexible pipe increases under its own elastic force.

[0014] In order to facilitate installation, the front wall of the inner water pipe is installed with connecting shafts extending backwards and arranged respectively corresponding to the two sides of the water outlet, and the first clamping arm and the second clamping arm are rotatably constrained on the corresponding connecting shafts.

[0015] Preferably, the front side wall of the inner water pipe is arched forward at the corresponding connection shaft and the elastic member to form an installation cavity, the front end of the connection shaft is constrained in the shaft hole of the installation cavity, the elastic member is arranged horizontally and its front part is constrained in the installation groove of the installation cavity, the front side wall of the first clamp arm is provided with a first convex part, and correspondingly, the front side wall of the second clamp arm is provided with a second convex part, and the rear part of the elastic member is elastically compressed between the first convex part and the second convex part. The above structure is adopted to facilitate the installation and assembly of the adjustment mechanism.

[0016] Preferably, a first gear ring is formed on the side wall of the middle portion of the first clamp arm facing the second clamp arm, and correspondingly, a second gear ring is formed on the side wall of the middle portion of the second clamp arm facing the first clamp arm, and the first gear ring and the second gear ring are meshed with each other to form a rotation support. The meshing transmission relationship between the first gear ring and the second gear ring can provide stable support for the relative rotation of the two, improve the rotation reliability of the two, avoid wear or excessive rotation, and ensure smooth resetting.

[0017] Preferably, the water-receiving part comprises a first water-receiving rib provided on the side wall of the first clamp arm and a second water-receiving rib provided on the side wall of the second clamp arm, and the first water-receiving rib and the second water-receiving rib are both formed into a V-shaped structure with an opening facing the incoming water. The outer part of the V-shaped structure is arranged along the length direction of the corresponding clamp arm, and the inner part of the V-shaped structure extends obliquely toward the direction of the corresponding clamp arm to enhance the force transmission effect after receiving the incoming water.

[0018] Preferably, the flexible pipe includes a first section and a second section, the diameter of the first section is smaller than the diameter of the second section, the first section is constrained in the water guide sleeve, the second section is located in the inner water pipe, the first section and the second section are connected by a connecting section with a single-side U-shaped cross section, the first clamping head has a first groove on the side thereof to match the outer wall of the second section, and correspondingly, the second clamping head has a second groove on the side thereof to match the outer wall of the second section. The above structure is adopted to improve the stability and reliability of assembly, avoid leakage, and maintain a high lift of the middle-layer spray arm.

[0019] A cleaning method, using the above cleaning machine:

[0020] (1) When the number of tableware in the upper part of the washing chamber is greater than or equal to M sets, the water flow rate in the inner water pipe is increased, and the regulating mechanism automatically expands the water inlet area of ​​the middle spray arm as the water flow rate increases, that is, the water supply of the middle spray arm is increased and the water supply of the top spray arm is reduced. The middle spray arm is used to wash the tableware with high intensity, and the top spray arm is used for auxiliary washing;

[0021] (2) When the number of dishes in the upper part of the washing chamber is less than M sets, the water flow rate in the inner water pipe is reduced, and the regulating mechanism automatically reduces the water inlet area of ​​the middle spray arm as the water flow rate decreases, that is, the water supply of the middle spray arm is reduced and the water supply of the top spray arm is increased, and the dishes are rinsed simultaneously by the middle spray arm and the top spray arm.

[0022] Compared with the prior art, the advantages of the present invention are: the regulating mechanism of the present invention adaptively adjusts the inlet area of ​​the middle spray arm according to the size of the water flow in the inner water pipe. Since the inner water pipe only supplies water to the middle spray arm and the top spray arm, the adaptive distribution of the water supply to the middle spray arm and the top spray arm can be achieved by adjusting the inlet area of ​​the middle spray arm. Therefore, according to actual cleaning needs, the water supply of the middle spray arm and the top spray arm can be controlled by controlling the water supply of the water pump to achieve stable water supply to the middle spray arm and the top spray arm, thereby improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a partial structural schematic diagram of an embodiment of the present invention;

[0024] Figure 2 It is a cross-sectional view of the inner water pipe in an embodiment of the present invention;

[0025] Figure 3 is another cross-sectional view of the inner water pipe in the embodiment of the present invention;

[0026] Figure 4 This is a diagram showing the coordination of the first clamp arm and the second clamp arm in an embodiment of the present invention;

[0027] Figure 52 is a diagram of the installation structure of the elastic member in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] like Figures 1 to 5 As shown, the cleaning machine of this embodiment includes a housing 1 , a water pump 2 , a lower spray arm 3 , an inner water pipe 5 , a middle spray arm 4 and a top spray arm 6 .

[0030] A concave water return area 11 is provided at the bottom of the box 1, and a filter plate 12 covers the top of the water return area 11. The water pump 2 is provided in the water return area 11 and is connected to the water return area 11. The water pump 2 is provided with a water suction port at the bottom, a first water outlet exposed above the filter plate 12 is provided at the top, and a second water outlet located in the water return area 11 is provided at the side. The lower spray arm 3 is provided at the top of the water pump 2 and is connected to the first water outlet of the water pump 2. The lower end of the inner water pipe 5 is connected to the second water outlet of the water pump 2. The inner water pipe 5 extends upward to the top of the box 1, and supplies water from the bottom of the box 1 upward.

[0031] The middle spray arm 4 is located in the middle of the box body 1 and is connected to the side of the inner water pipe 5. The top spray arm 6 is arranged at the top of the box body 1 and is connected to the top of the inner water pipe 5. It also includes an adjusting mechanism 7 that can expand the water inlet area of ​​the middle spray arm 4 as the water flow rate increases and reduce the water inlet area of ​​the middle spray arm 4 as the water flow rate decreases. The adjusting mechanism 7 is arranged in the inner water pipe 5 and is located at the connection between the middle spray arm 4 and the inner water pipe 5.

[0032] A water outlet 51 is provided on the side of the inner water pipe 5, and the middle spray arm 4 is connected to the water outlet 51 through a transversely arranged water guide pipe 41, and the regulating mechanism 7 is used to control the flow cross-sectional area of ​​the water outlet 51. The regulating mechanism 7 is arranged here to facilitate direct control of the flow cross-sectional area of ​​the water outlet 51 through the shortest path.

[0033] The side wall of the inner water pipe 5 is provided with a water guide sleeve 52 extending from the water outlet 51 to the water guide pipe 41. The regulating mechanism 7 includes a flexible tube 71 and a clamping assembly 72. The first end of the flexible tube 71 is inserted in the water guide sleeve 52 and the second end is located in the inner water pipe 5. The clamping assembly 72 is arranged in the inner water pipe 5 and clamped on the outer periphery of the flexible tube 71. The flexible tube 71 can be a corrugated soft rubber tube to facilitate radial expansion and contraction, and the flow cross-sectional area of ​​the water outlet 51 can be flexibly controlled as the clamping assembly 72 is opened and closed.

[0034] The clamping assembly 72 can be movably clamped on the outer periphery of the flexible tube 71. The clamping assembly 72 is provided with a water-receiving portion arranged toward the incoming water direction. When the water flow rate increases, the water-receiving portion transmits a large force to the clamping assembly 72 to drive the clamping assembly 72 to loosen the flexible tube 71 and increase the flow area of ​​the water outlet 51. When the water flow rate decreases, the water-receiving portion transmits a small force to the clamping assembly 72 to clamp the flexible tube 71 and reduce the flow area of ​​the water outlet 51. With such a structure, the flow cross-sectional area of ​​the water outlet 51 can be flexibly controlled as the clamping assembly 72 opens and closes.

[0035] The clamping assembly 72 includes a first clamping arm 721 and a second clamping arm 722. The middle parts of the first clamping arm 721 and the second clamping arm 722 are respectively rotationally constrained on the front wall of the inner water pipe 5. The upper part of the first clamping arm 721 forms a first clamping head 7211 clamped on one side of the flexible tube 71, and the upper part of the second clamping arm 722 forms a second clamping head 7221 clamped on the second side of the flexible tube 71. The water-facing part is arranged at the lower part of the first clamping arm 721 and the second clamping arm 722. The side of the clamping assembly 72 is also provided with an elastic member 73 respectively connected to the lower part of the first clamping arm 721 and the second clamping arm 722 so that the two maintain a relatively close trend. With the above structure, when the water flow rate is small, the force of the elastic member 73 is large, driving the lower ends of the first clamp arm 721 and the second clamp arm 722 to be relatively separated, and the upper ends of the first clamp arm 721 and the second clamp arm 722 will be close to each other, thereby maintaining the diameter of the flexible tube 71 in a smaller range; when the water flow rate increases and is greater than the force of the elastic member 73, the lower ends of the first clamp arm 721 and the second clamp arm 722 are driven to be relatively close, and the upper ends of the first clamp arm 721 and the second clamp arm 722 will be relatively separated, and the diameter of the flexible tube 71 increases under its own elastic force.

[0036] For ease of installation, the front wall of the inner water pipe 5 is provided with connecting shafts 74 extending backwards and arranged corresponding to both sides of the water outlet 51 , and the first clamping arm 721 and the second clamping arm 722 are rotatably constrained on the corresponding connecting shafts 74 .

[0037] The front side wall of the inner water pipe 5 is arched forward at the corresponding connection shaft 74 and the elastic member 73 to form the installation cavity 53, the front end of the connection shaft 74 is constrained in the shaft hole 531 of the installation cavity 53, the elastic member 73 is arranged horizontally and its front part is constrained in the installation groove 532 of the installation cavity 53, the front side wall of the first clamping arm 721 is provided with a first convex part 7212, and correspondingly, the front side wall of the second clamping arm 722 is provided with a second convex part 7222, and the rear part of the elastic member 73 is elastically compressed between the first convex part 7212 and the second convex part 7222. The above structure is adopted to facilitate the installation and assembly of the adjustment mechanism 7.

[0038] A first gear ring 7213 is formed on the side wall of the middle portion of the first clamp arm 721 facing the second clamp arm 722, and correspondingly, a second gear ring 7223 is formed on the side wall of the middle portion of the second clamp arm 722 facing the first clamp arm 721. The first gear ring 7213 and the second gear ring 7223 mesh with each other to form a rotation support. The meshing transmission relationship between the first gear ring 7213 and the second gear ring 7223 can provide stable support for the relative rotation of the two, improve the rotation reliability of the two, avoid wear or excessive rotation, and ensure smooth resetting.

[0039] The water-receiving part includes a first water-receiving rib 7214 provided on the side wall of the first clamp arm 721 and a second water-receiving rib 7224 provided on the side wall of the second clamp arm 722. The first water-receiving rib 7214 and the second water-receiving rib 7224 are both formed into a V-shaped structure with an opening facing the incoming water. The outer part of the V-shaped structure is arranged along the length direction of the corresponding clamp arm, and the inner part of the V-shaped structure extends obliquely toward the corresponding clamp arm to enhance the force transmission effect after receiving the incoming water.

[0040] The flexible pipe 71 includes a first section 711 and a second section 712. The diameter of the first section 711 is smaller than that of the second section 712. The first section 711 is constrained in the water guide sleeve 52, and the second section 712 is located in the inner water pipe 5. The first section 711 and the second section 712 are connected by a connecting section 713 with a U-shaped cross section on one side. The first clamp 7211 is provided with a first groove 7215 matching the outer wall surface of the second section 712 on the side, and correspondingly, the second clamp 7221 is provided with a second groove 7225 matching the outer wall surface of the second section 712 on the side. The above structure is adopted to improve the stability and reliability of assembly, avoid leakage, and maintain a high head of the middle spray arm 4.

[0041] The cleaning method of this embodiment:

[0042] (1) When the number of tableware in the upper part of the washing chamber is greater than or equal to M sets, the water flow rate of the inner water pipe 5 is increased, and the regulating mechanism 7 automatically expands the water inlet area of ​​the middle spray arm 4 as the water flow rate increases, that is, the water supply of the middle spray arm 4 is increased and the water supply of the top spray arm 6 is reduced, and the middle spray arm 4 is used to wash the tableware with high intensity, while the top spray arm 6 is used for auxiliary washing;

[0043] (2) When the number of tableware in the upper part of the washing chamber is less than M sets, the water flow rate transported upward in the inner water pipe 5 is reduced, and the regulating mechanism 7 automatically reduces the water inlet area of ​​the middle spray arm 4 as the water flow rate decreases, that is, the water supply of the middle spray arm 4 is reduced and the water supply of the top spray arm 6 is increased, and the tableware is rinsed simultaneously by using the middle spray arm 4 and the top spray arm 6.

[0044] In addition, when the dishes in the washing chamber are difficult to clean, for example, when there are residues such as egg custard and caramel on the surface of the dishes, the water supply of the inner water pipe 5 can be controlled by the water pump 2 to increase or decrease the water supply from time to time, so that the middle spray arm and the top spray arm form a pulse flushing mode, so as to further improve the stripping force of pollutants and improve the cleaning effect.

[0045] The regulating mechanism 7 of the present embodiment adaptively adjusts the inlet area of ​​the middle-layer spray arm 4 according to the water flow rate in the inner water pipe 5. Since the inner water pipe 5 only supplies water to the middle-layer spray arm 4 and the top-layer spray arm 6, the adaptive distribution of the water supply to the middle-layer spray arm 4 and the top-layer spray arm 6 can be achieved by adjusting the inlet area of ​​the middle-layer spray arm 4. Therefore, according to actual cleaning needs, the water supply of the water pump can be controlled to achieve stable water supply to the middle-layer spray arm 4 and the top-layer spray arm 6, thereby improving the cleaning effect.

[0046] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A cleaning machine, comprising a box, an inner water pipe, a middle spray arm and a top spray arm, wherein the inner water pipe supplies water from the bottom of the box upward, the middle spray arm is located in the middle of the box and connected to the side of the inner water pipe, and the top spray arm is located at the top of the box and connected to the top of the inner water pipe, characterized in that: It also includes an adjusting mechanism that can expand the water inlet area of ​​the middle spray arm as the water flow increases and reduce the water inlet area of ​​the middle spray arm as the water flow decreases. The adjusting mechanism is arranged in the inner water pipe and is located at the connection between the middle spray arm and the inner water pipe.

2. The cleaning machine according to claim 1, characterized in that: A water outlet is provided on the side of the inner water pipe, and the middle-layer spray arm is connected to the water outlet through a transversely arranged water guide pipe. The regulating mechanism is used to control the flow cross-sectional area of ​​the water outlet.

3. The cleaning machine according to claim 2, characterized in that: The side wall of the inner water pipe is provided with a water guide sleeve extending from the water outlet into the water guide pipe. The regulating mechanism includes a flexible tube and a clamping assembly. The first end of the flexible tube is inserted in the water guide sleeve and the second end is located in the inner water pipe. The clamping assembly is arranged in the inner water pipe and clamped on the outer periphery of the flexible tube.

4. The cleaning machine according to claim 3, characterized in that: The clamping assembly can be movably clamped on the outer periphery of the flexible tube, and is provided with a water-receiving portion arranged toward the incoming water direction. When the water flow rate increases, the water-receiving portion transmits a large force to the clamping assembly to drive the clamping assembly to loosen the flexible tube and increase the flow area of ​​the water outlet; when the water flow rate decreases, the water-receiving portion transmits a small force to the clamping assembly to cause the clamping assembly to clamp the flexible tube and reduce the flow area of ​​the water outlet.

5. The cleaning machine according to claim 4, characterized in that: The clamping assembly includes a first clamping arm and a second clamping arm, the middle parts of the first clamping arm and the second clamping arm are respectively rotationally constrained on the front wall of the inner water pipe, the upper part of the first clamping arm forms a first clamping head clamped on one side of the flexible pipe, and the upper part of the second clamping arm forms a second clamping head clamped on the second side of the flexible pipe, the water-facing part is arranged at the lower part of the first clamping arm and the second clamping arm, and the side part of the clamping assembly is also provided with elastic parts respectively connected to the lower part of the first clamping arm and the second clamping arm so that the two maintain a relatively close trend.

6. The cleaning machine according to claim 5, characterized in that: The front wall of the inner water pipe is provided with connection shafts extending backwards and arranged corresponding to the two sides of the water outlet respectively, and the first clamp arm and the second clamp arm are rotatably constrained on the corresponding connection shafts.

7. The cleaning machine according to claim 6, characterized in that: The front side wall of the inner water pipe is arched forward at the corresponding connecting shaft and the elastic member to form an installation cavity, the front end of the connecting shaft is constrained in the axial hole of the installation cavity, the elastic member is arranged horizontally and its front part is constrained in the installation groove of the installation cavity, the front side wall of the first clamp arm is provided with a first protrusion, and correspondingly, the front side wall of the second clamp arm is provided with a second protrusion, and the rear part of the elastic member is elastically compressed between the first protrusion and the second protrusion.

8. The cleaning machine according to claim 5, characterized in that: A first gear ring is formed on the side wall of the middle part of the first clamp arm facing the second clamp arm, and correspondingly, a second gear ring is formed on the side wall of the middle part of the second clamp arm facing the first clamp arm. The first gear ring and the second gear ring are meshed with each other to form a rotation support fit.

9. The cleaning machine according to claim 5, characterized in that: The water-receiving part comprises a first water-receiving rib arranged on the side wall of the first clamp arm and a second water-receiving rib arranged on the side wall of the second clamp arm. The first water-receiving rib and the second water-receiving rib are both formed into a V-shaped structure with an opening facing the incoming water.

10. The cleaning machine according to claim 5, characterized in that: The flexible tube includes a first section and a second section, the diameter of the first section is smaller than the diameter of the second section, the first section is constrained in the water guide sleeve, the second section is located in the inner water pipe, the first section and the second section are connected by a connecting section with a single-side cross-section of U, the first clamp has a side portion provided with a first groove that matches the outer wall surface of the second section, and correspondingly, the second clamp has a side portion provided with a second groove that matches the outer wall surface of the second section.

11. A cleaning method, characterized in that: Using the cleaning machine described in any one of claims 1 to 10, (1) When the number of tableware in the upper part of the washing chamber is greater than or equal to M sets, the water flow rate in the inner water pipe is increased, and the regulating mechanism automatically expands the water inlet area of ​​the middle spray arm as the water flow rate increases, that is, the water supply of the middle spray arm is increased and the water supply of the top spray arm is reduced. The middle spray arm is used to wash the tableware with high intensity, and the top spray arm is used for auxiliary washing; (2) When the number of dishes in the upper part of the washing chamber is less than M sets, the water flow rate in the inner water pipe is reduced, and the regulating mechanism automatically reduces the water inlet area of ​​the middle spray arm as the water flow rate decreases, that is, the water supply of the middle spray arm is reduced and the water supply of the top spray arm is increased, and the dishes are rinsed simultaneously by the middle spray arm and the top spray arm.

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