cleaning machine

Abstract

This invention relates to a cleaning machine comprising a cleaning tank; a main spray arm rotatably disposed near the bottom of a washing chamber, having a main flow channel inside and at least a spray hole on its top wall communicating with the main flow channel; a water outlet on the side wall communicating with the main flow channel and a sealing member for opening or closing the water outlet; a secondary spray arm disposed near a corner of the washing chamber, located around the main spray arm, arranged to be able to move up and down relative to the cleaning tank, having a secondary flow channel inside and a water outlet communicating with the secondary flow channel; and a pushing member disposed on the secondary spray arm, having an inlet channel communicating with the secondary flow channel. When the pushing member moves up and down with the secondary spray arm to a position on the rotation path of the water outlet of the main spray arm, the sealing member of the main spray arm can be pushed by the pushing member to open the water outlet, thereby connecting the main flow channel and the secondary flow channel. This improves the cleaning ability of corners by cleaning the corner where the secondary spray arm is located.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of household appliances, and particularly relates to a cleaning machine. BACKGROUND

[0002] The cleaning machine is a device for spraying cold water or hot water to dishes to remove dirt adhered to the dishes or fruits and vegetables and clean the dishes or fruits and vegetables. The existing spray-type cleaning machine generally realizes spraying in each direction through rotation of a sprayer.

[0003] The current cleaning machine, such as the Chinese patent application for a rotating spray arm for a cleaning machine and a cleaning machine applying the rotating spray arm, patent application number CN201811440066.7 (application publication number CN111227749A) discloses a rotating spray arm for a cleaning machine, which comprises an upper cover body and a lower cover body that are buckled to each other, a flow channel is formed between the upper cover body and the lower cover body, an upward first nozzle for spraying cleaning is formed on the upper cover body, the first nozzle is in communication with the flow channel, and the cleaning of the objects to be cleaned in the washing chamber of the cleaning machine is realized by rotating the spray arm. However, since a gap is left between the rotating spray arm and the inner circumferential wall of the washing chamber, the spraying area is limited during rotation of the rotating spray arm, and a cleaning dead angle is prone to occur in the corner of the washing chamber.

[0004] Therefore, it is necessary to further improve the existing cleaning machine. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide a cleaning machine capable of cleaning the corner in view of the status of the prior art.

[0006] The second technical problem to be solved by the present application is to provide a cleaning machine capable of enhancing the cleaning ability of the corner.

[0007] The technical scheme adopted by the present application to solve the first technical problem is as follows: a cleaning machine comprises:

[0008] a cleaning tank, which has a washing chamber in the inside;

[0009] a main spray arm, which is rotatably arranged at a position adjacent to the bottom of the washing chamber, has a main flow channel in the inside, and has a water spraying hole in at least the top wall in communication with the main flow channel;

[0010] characterized in that a water outlet in communication with the main flow channel and a plugging member arranged at the water outlet to open or close the water outlet are formed in the side wall of the main spray arm, and the cleaning machine further comprises:

[0011] A sub-spraying arm is arranged at a position adjacent to a corner of the washing chamber and located at a side of the main-spraying arm, and is arranged to be able to ascend and descend relative to the washing chamber, and has a sub-flow channel in the interior and a water outlet hole in communication with the sub-flow channel.

[0012] A pushing member is arranged in the sub-spraying arm and has a water inlet channel in fluid communication with the sub-flow channel, and when the pushing member moves along with the sub-spraying arm in the up-down direction to a state in which the rotating path of the water outlet of the main-spraying arm is located, the blocking member of the main-spraying arm can be pushed by the pushing member to open the water outlet and then make the main-flow channel and the sub-flow channel in communication.

[0013] The technical solution adopted by the present application to solve the second technical problem is that the sub-spraying arm comprises a connecting seat and a spraying body rotatably arranged in the connecting seat, the water outlet hole is arranged on the spraying body, the interior of the spraying body is hollow to form the sub-flow channel, the pushing member is arranged on the side wall of the connecting seat, and the interior of the connecting seat is hollow to form a cavity in communication with the water inlet channel and the sub-flow channel.

[0014] The bottom of the spraying body is rotatably arranged on the top of the connecting seat, and the side of the spraying body can also be rotatably arranged on the connecting seat, but preferably, the bottom of the spraying body is rotatably arranged on the top of the connecting seat, and the bottom of the spraying body has a water passing hole in communication with the cavity of the connecting seat at a position adjacent to the center, and the water outlet hole is arranged on the top wall of the spraying body.

[0015] In order to realize the rotating connection of the spraying body and the connecting seat, the circumferential side of the water passing hole is provided with at least two extension rods arranged in a circumferential direction and extending downward, the side wall of the extension rod has a lateral extension protrusion at a position adjacent to the bottom, the top wall plate of the connecting seat is provided with a insertion hole for inserting the extension rod, and in the state that the spraying body is arranged in the connecting seat, the top wall plate of the connecting seat is located between the protrusion and the spraying body.

[0016] In order to reliably push the blocking member, the side wall of the connecting seat is provided with a mounting hole for mounting the pushing member, and the pushing member is arranged to move back and forth along the extension direction of the mounting hole.

[0017] In order to realize the inward and outward movement of the pushing member, the bottom wall plate of the connecting seat is mounted with a sliding member capable of ascending and descending relative to the connecting seat, the upper part of the sliding member is located in the cavity of the connecting seat, and the top surface of the sliding member has an inclined surface gradually inclined toward the direction of the mounting hole from top to bottom, and the sub-spraying arm further comprises an elastic member acting on the pushing member and making the pushing member always have a tendency to move inward along the extension direction of the mounting hole. In addition, the driving assembly can also actively drive the pushing member to move inward and outward.

[0018] In order to prevent the sliding member from being separated from the connecting seat, a bottom wall plate of the connecting seat is provided with an assembly hole for installing the sliding member, and an outer peripheral wall of the sliding member is provided with an upper limiting plate and a lower limiting plate arranged in a spaced manner from top to bottom, the upper limiting plate being located below the inclined surface, and the bottom wall plate of the connecting seat being located between the upper limiting plate and the lower limiting plate.

[0019] The secondary spraying arm can be manually driven to move up and down, or can be actively driven by a driving mechanism to move up and down, but from the perspective of operation reliability and convenience, preferably, at least a driving mechanism for driving the secondary spraying arm to move up and down is further included, and a power output end of the driving mechanism is drivingly connected with the secondary spraying arm.

[0020] The driving mechanism can have various structural forms, and can be in the form of a push rod motor, or in the form of a push cylinder, or in other forms, but preferably, the driving mechanism includes a motor and a vertically extending screw rod, the screw rod is installed on an output shaft of the motor, and the sliding member is provided with an internal screw hole in threaded connection with the screw rod.

[0021] In order to realize the cleaning work of only the primary spraying arm, the secondary spraying arm has a state of being located below the primary spraying arm, and in this state, the blocking member blocks the water outlet of the primary spraying arm.

[0022] The blocking member can have various structural forms, and can move in and out of the water outlet, or can rotate, but preferably, the blocking member is a valve plate rotatably arranged at the water outlet, the valve plate is located in the main flow passage, and the valve plate includes a blocking portion and a connecting portion connected with the primary spraying arm, the connecting portion is an elastic sheet that always has a movement trend towards closing the water outlet.

[0023] In order to clean each corner, the cross section of the cleaning tank is square, the secondary spraying arm has four, and is respectively arranged at four corners of the washing chamber, and each secondary spraying arm corresponds to one pusher.

[0024] In order to clean at least one corner located on the diagonal line, the opposite two side walls of the primary spraying arm are provided with the water outlet, in a state where the primary spraying arm is rotated to be arranged along the diagonal line direction of the washing chamber, the primary spraying arm is connected with at least one secondary spraying arm located on the diagonal line, and is in fluid communication with the secondary flow passage of the secondary spraying arm.

[0025] Compared with the prior art, the advantages of the present invention are as follows: The cleaning machine sets up a secondary spray arm at the corner, which can move up and down. The secondary spray arm can move to a state where its pusher is located on the rotation path of the water outlet of the main spray arm. In this state, the pusher can push the sealing part of the main spray arm to open the water outlet, thereby connecting the main flow channel of the main spray arm and the secondary flow channel of the secondary spray arm. This cleans the corner where the secondary spray arm is located, improving the cleaning ability of the corner. In addition, the main spray arm and the secondary spray arm share the same water channel, avoiding the cumbersomeness of setting up separate water channels. Attached Figure Description

[0026] Figure 1 A partial structural diagram showing the main spray arm located below the auxiliary spray arm and the two being unconnected to each other.

[0027] Figure 2 for Figure 1 A longitudinal sectional view;

[0028] Figure 3 for Figure 1 Another longitudinal sectional view;

[0029] Figure 4 A longitudinal sectional view of the main spray arm and two auxiliary spray arms in the connected state.

[0030] Figure 5 A cross-sectional view of the main spray arm and two auxiliary spray arms in the connected state.

[0031] Figure 6 This is a schematic diagram of the spray system. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] like Figures 1 to 6 As shown, the washing machine in this embodiment is a washing machine for washing fruits and vegetables or dishes. The aforementioned washing machine includes a washing tank 1, a main spray arm 2, a secondary spray arm 3, a pushing component 4, a sliding component 5, a driving mechanism 6, an elastic component, and a water pumping mechanism 8.

[0034] like Figures 1 to 5 As shown, the washing tank 1 described above includes a tank body 1a with an open top and a door (not shown) covering the open top of the tank body. With the door closed at the open top of the tank body 1a, the tank body 1a and the door together form a washing chamber 10. In this embodiment, the tank body 1a has a square cross-section.

[0035] like Figures 1 to 5As shown, the bottom of the washing chamber 10 is provided with a flow guide base 13, and the main spray arm 2 is rotatably arranged on the flow guide base 13, and the main spray arm 2 has a main flow channel 20 inside. The top wall plate of the main spray arm 2 has water injection holes 201 which are in communication with the main flow channel 20, and water is injected upward through the water injection holes 201. The main spray arm 2 can be in the shape of a straight line, or in the shape of S, or in other shapes. The main flow channel 20 includes a central water collecting cavity 20a and branch flow channels 20b which are arranged on both sides of the water collecting cavity 20a along the length direction of the main spray arm 2, and the water collecting cavity 20a is in communication with the branch flow channels 20b. In this embodiment, the water injection holes 201 are arranged at positions corresponding to the branch flow channels 20b, and there are a plurality of water injection holes 201 which are arranged at intervals along the length direction of the branch flow channels. The bottom wall plate of the main spray arm 2 is adjacent to the central position and has a liquid inlet channel which is in communication with the water collecting cavity 20a. The pump water mechanism 8 is used to pump water at the bottom of the washing chamber 10 to the water collecting cavity 20a of the main spray arm 2 through the internal flow channel of the flow guide base 13 and the liquid inlet channel. The bottom surface of the main spray arm has two drive holes which are in communication with the main flow channel, and the reaction force generated by the water flow injected from the two drive holes drives the main spray arm 2 to rotate. In this embodiment, the pump water mechanism is the pump water mechanism in the prior application of the applicant, and will not be described in detail.

[0036] As shown in the figure, Figure 3 The side wall of the main spray arm 2 is provided with a water outlet 202 which is in communication with the main flow channel 20 and a blocking piece which is arranged at the water outlet 202 to open or close the water outlet 202. In this embodiment, the opposite side walls of the main spray arm 2 are each provided with a water outlet 202, and each water outlet 202 corresponds to a blocking piece. Figure 5 As shown in the figure, the blocking piece is a valve piece 21 which is rotatably arranged at the water outlet 202, and the valve piece 21 is located in the main flow channel 20 and includes a blocking part 211 and a connecting part which is connected to the main spray arm 2. The connecting part is an elastic piece 212 which always has a movement trend towards the direction of closing the water outlet 202. In this embodiment, when the water outlet 202 is in the open state, the blocking part 211 can rotate relative to the elastic piece 212.

[0037] The four auxiliary spray arms 3 are arranged at the four corners of the washing chamber 10, and each auxiliary spray arm 3 corresponds to a set of driving mechanisms and a pushing piece. The structure of each auxiliary spray arm 3 and the connection mode with the corresponding driving mechanisms and pushing piece are the same, and one of the auxiliary spray arms 3 will be taken as an example for description.

[0038] The auxiliary spray arm 3 is located at the side of the main spray arm 2 and is driven by the respective driving mechanism 6 to move up and down relative to the cleaning tank 1, i.e. relative to the main spray arm 2. The auxiliary spray arm 3 comprises a connecting seat 31 and a spray body 32 rotatably arranged on the top of the connecting seat 31. In the embodiment, the spray body 32 is in the shape of a straight line or an S shape. The spray body 32 is hollow inside and forms an auxiliary flow channel 30. The top wall of the spray body 32 has a plurality of water outlets 321 which are in communication with the auxiliary flow channel 30 and are arranged along the length direction of the spray body 32. The bottom of the spray body 32 has a water passing hole 322 which is adjacent to the center. The connecting seat 31 is hollow inside and forms a cavity 310 which is in communication with the water passing hole 322.

[0039] In order to realize the rotation connection between the connecting seat 31 and the spray body 32, the water passing hole 322 is provided with at least two extension rods 323 which are arranged along the circumference direction and extend downward. In the embodiment, there are three extension rods 323, and four or more extension rods can also be used. Each extension rod has the same structure, and one of the extension rods 323 will be described below. The side wall of the extension rod 323 has a protrusion 3231 which extends laterally and is adjacent to the bottom. The extension rod 323 is elastic. The top wall of the connecting seat 31 is provided with an insertion hole 311 in which the extension rod 323 is inserted. In the state that the spray body 32 is installed on the connecting seat 31, the top wall of the connecting seat 31 is located between the protrusion 3231 and the spray body 32, so that the spray body 32 and the connecting seat 31 are connected.

[0040] The pusher 4 is arranged on the side wall of the connecting seat 31 and has a water inlet channel 40 which is in communication with the cavity 310. Thus, the cavity 310 realizes the communication between the water inlet channel 40 and the auxiliary flow channel 30. Along the fluid flow direction, the main flow channel 20, the water inlet channel 40, the cavity 310 and the auxiliary flow channel 30 are arranged in sequence. In the embodiment, the side wall of the connecting seat 31 is provided with a mounting hole 312 in which the pusher 4 is installed. The pusher 4 is arranged to move back and forth along the extension direction of the mounting hole 312, i.e. the thickness direction of the side wall of the connecting seat 31. In order to realize the back and forth movement of the pusher 4, specifically, the bottom wall of the connecting seat 31 is installed with a sliding member 5 which moves up and down relative to the connecting seat 31. The upper part of the sliding member 5 is located in the cavity 310 of the connecting seat 31, and the top surface of the sliding member 5 has an inclined surface 51 which gradually inclines towards the mounting hole 312 from top to bottom. The auxiliary spray arm 3 further comprises an elastic member which acts on the pusher 4 and makes the pusher 4 always have a tendency to move inward along the extension direction of the mounting hole 312. In the embodiment, the elastic member is a spring 7 which is located in the cavity 310. The extension direction of the spring 7 is along the inward and outward movement direction of the pusher 4. The first end of the spring 7 is connected to the corresponding wall of the cavity 310, and the second end of the spring 7 is connected to the inner end of the pusher 4.

[0041] In order to prevent the sliding member 5 from being detached from the connecting seat 31, the bottom wall plate of the connecting seat 31 is provided with an assembly hole for mounting the sliding member 5, and the outer peripheral wall of the sliding member 5 is provided with an upper limiting plate 52 and a lower limiting plate 53 arranged in a spaced-apart manner from top to bottom, the upper limiting plate 52 being located below the inclined surface 51, and the bottom wall plate of the connecting seat 31 being located between the upper limiting plate 52 and the lower limiting plate 53.

[0042] The driving mechanism 6 described above is used to drive the sub-spraying arm 3 to move up and down, and the power output end of the driving mechanism 6 is connected with the sub-spraying arm 3. Specifically, the driving mechanism 6 comprises a motor 61 and a vertically extending screw rod 62, the screw rod 62 being mounted on the output shaft of the motor 61, and the sliding member 5 is provided with an inner threaded hole for threadedly connecting with the screw rod 62. In this way, when the motor 61 is in a working state, the sliding member 5 can be driven to move up and down, thereby driving the sub-spraying arm 3 to move up and down.

[0043] When the sub-spraying arm 3 moves upward to a state in which the corresponding pushing member 4 is located in the rotating path of the water outlet 202 of the main-spraying arm 2, the valve sheet 21 of the main-spraying arm 2 is pushed by the pushing member 4 to open the water outlet 202, thereby enabling the main flow channel 20 to communicate with the sub-flow channel 30 through the water inlet passage 40 and the cavity 310. In the embodiment, as shown in Figure 5 When the sub-spraying arm 3 is located below the main-spraying arm 2, in the process of rotating the main-spraying arm 2, the sub-spraying arm 3 avoids interfering with the rotation of the main-spraying arm 2, and the sub-flow channel of the sub-spraying arm 3 and the main flow channel of the main-spraying arm 2 are not in communication with each other, and the valve sheet 21 blocks the water outlet 202 of the main-spraying arm 2, so that the water flow in the main flow channel 20 cannot flow out through the water outlet 202.

[0044] The process of adjusting the up-and-down movement of the sub-spraying arm 3 is as follows:

[0045] When the above-mentioned sub-spraying arm 3 is lowered, the motor 61 is reversely rotated, the sliding member 5 is lowered, the pushing member 4 is moved right under the action of the spring 7, the right end surface of the pushing member 4 is in contact with the inclined surface 51 of the sliding member 5, the pushing member 4 is slid right to the stop position, at this time, the left end of the pushing member 4 is separated from the water outlet 202 of the main spraying arm. When the motor 61 continues to be reversely rotated, the sliding member 5 continues to be lowered, when the lower limit plate of the sliding member 5 is in contact with the bottom wall of the cavity 310, the sliding member 5 continues to be lowered and drives the sub-spraying arm 3 to move downward, at this time, the whole sub-spraying arm 3 is lowered to the stop position, at this time, the main spraying arm 2 does not interfere with the sub-spraying arm 3, the main spraying arm 2 can be rotated along the circumference. When the sub-spraying arm 3 needs to be cleaned, the motor 61 is forwardly rotated, the sliding member 5 is moved upward, the right end surface of the pushing member 4 is moved left under the action of the inclined surface 51 of the sliding member 5, thereby the communication between the main spraying arm and the sub-spraying arm 3 is realized. The above-mentioned upward and downward movement of the sub-spraying arm 3 can be realized by the forward and reverse rotation of the motor 61, thereby the cleaning of the main spraying arm 2 or the cleaning of the main spraying arm 2 and one of the sub-spraying arms 2 or the cleaning of the main spraying arm 2 and two of the sub-spraying arms 2 is realized.

[0046] The working process of the above-mentioned cleaning machine is as follows:

[0047] When the sub-spraying arms are not needed, the four sub-spraying arms 3 are driven by the driving mechanisms 6 to move downward, at this time, the main spraying arm 2 is communicated with none of the sub-spraying arms 3 during the rotation of the main spraying arm 2, at this time, only the main spraying arm 2 works to clean.

[0048] When the sub-spraying arms are needed, the four sub-spraying arms 3 are driven by the driving mechanisms 6 to move upward, when the pushing member 4 of the sub-spraying arm 3 is located in the rotating path of the main spraying arm 2 to the water outlet 202, when the main spraying arm 2 is rotated to the position adjacent to the two sub-spraying arms 3 on one of the diagonal lines, the pushing member 4 of the sub-spraying arm 3 pushes the valve sheet 21 to open the water outlet 202, at this time, the water flowing out of the main flow channel 20 and the water outlet 202 flows into the sub-flow channel 30 through the water inlet channel 40 and the cavity 310, and the water outlet hole 321 sprays upward, due to the reaction force of the water jet from the water outlet hole 321 of the spraying body 32 of the sub-spraying arm, the spraying body 32 is driven to rotate relative to the connecting seat 31, thereby the cleaning of the corner is strengthened. Similarly, when the main spraying arm 2 is rotated to the other two sub-spraying arms 3, the other two sub-spraying arms 3 can also be communicated to make the other two spraying bodies 32 rotate to clean the other two corner regions. In this way, the cleaning of the four corners of the washing chamber is strengthened, and the cleaning of the middle region of the washing chamber by the main spraying arm 2 is combined, thereby the effective cleaning of each region of the whole washing chamber is realized, and the dead angle of cleaning is avoided. In addition, when the position of the sub-spraying arm 3 is kept unchanged, the main spraying arm is always communicated with the corresponding sub-spraying arm, thereby the cleaning of a certain region is strengthened.

[0049] Directional terms as used in describing the various example structural parts and elements of the application, such as "front", "back", "up", "down", "left", "right", "side", "top", "bottom", and the like, are made only for the purpose of illustrating the application and are not intended to be limiting. These terms are made with reference to the example orientation of the figures as shown and are used only to facilitate the description of the application. Since the embodiments disclosed herein can be positioned in different orientations, these directional terms are used only as a matter of convenience and should not be construed as limiting, e.g., "up" and "down" are not necessarily limited to directions opposite or in line with the direction of gravity.

[0050] As used herein, "in fluid communication" refers to the spatial relationship between two components or locations (hereinafter referred to as a first location and a second location, respectively), i.e., a fluid (gas, liquid, or a mixture of both) can flow or / and be transported from the first location to the second location along a flow path. The first location and the second location can be directly connected, or they can be indirectly connected through at least one third party, which can be a fluid passage such as a pipe, a channel, a conduit, a flow guide, a hole, a slot, etc., or a chamber allowing fluid to flow, or a combination thereof.

Claims

1. A cleaning machine comprising: a cleaning tank (1) having a washing chamber (10) inside; a main spray arm (2) rotatably arranged at a position adjacent to a bottom of the washing chamber (10), having a main flow channel (20) inside, and having water spraying holes (201) in at least a top wall of the main spray arm (2) and communicating with the main flow channel (20); characterized in that the side wall of the main spray arm (2) is provided with a water outlet (202) communicating with the main flow channel (20) and a blocking member arranged at the water outlet (202) to open or close the water outlet (202), the cleaning machine further comprising: a sub-spray arm (3) arranged at a position adjacent to a corner of the washing chamber (10) and located at a circumferential side of the main spray arm (2), and arranged to be able to move up and down relative to the cleaning tank (1), having a sub-flow channel (30) inside and having water outlet holes (321) communicating with the sub-flow channel (30); and a pushing member (4) arranged in the sub-spray arm (3) and having a water inlet channel (40) inside and in fluid communication with the sub-flow channel (30), when the pushing member (4) moves along with the sub-spray arm (3) in a up and down direction to a state where the main spray arm (2) is located in a rotating path of the water outlet (202), the blocking member of the main spray arm (2) can be pushed by the pushing member (4) to open the water outlet (202) and then make the main flow channel (20) and the sub-flow channel (30) in communication.

2. The cleaning machine of claim 1, wherein: The sub-spray arm (3) comprises a connecting seat (31) and a spray body (32) rotatably arranged in the connecting seat (31), the water outlet holes (321) are arranged on the spray body (32), the sub-flow channel (30) is formed in the interior of the spray body (32), the pushing member (4) is arranged on the side wall of the connecting seat (31), and the connecting seat (31) is hollow inside and has a cavity (310) communicating the water inlet channel (40) and the sub-flow channel (30).

3. The cleaning machine of claim 2, wherein: The bottom of the spray body (32) is rotatably arranged on the top of the connecting seat (31), and the bottom of the spray body (32) has a water passing hole (322) adjacent to the center and communicating with the cavity (310) of the connecting seat (31), and the water outlet holes (321) are arranged on the top wall of the spray body (32).

4. The cleaning machine of claim 3, wherein: The circumferential side of the water passing hole (322) is provided with at least two extension rods (323) arranged in a circumferential direction and extending downward, the side wall of the extension rod (323) has a lateral extension protrusion (3231) adjacent to the bottom, the top wall plate of the connecting seat (31) is provided with a insertion hole (311) for the extension rod (323) to be inserted therein, and in the state that the spray body (32) is installed in the connecting seat (31), the top wall plate of the connecting seat (31) is located between the protrusion (3231) and the spray body (32).

5. The cleaning machine of claim 2, wherein: The side wall of the connecting seat (31) is provided with a mounting hole (312) for mounting the push member (4), and the push member (4) is arranged to move back and forth along the extension direction of the mounting hole (312).

6. The cleaning machine of claim 5, wherein: The bottom wall plate of the connecting seat (31) is provided with a sliding member (5) capable of moving up and down relative to the connecting seat (31), the upper part of the sliding member (5) is located in the cavity (310) of the connecting seat (31), and the top surface of the sliding member (5) has an inclined surface (51) gradually inclined from top to bottom towards the mounting hole (312), and the secondary spray arm (3) further comprises an elastic member acting on the push member (4) and making the push member (4) always have a tendency to move inward along the extension direction of the mounting hole (312).

7. The cleaning machine of claim 6, wherein: The bottom wall plate of the connecting seat (31) is provided with a mounting hole for mounting the sliding member (5), and the outer peripheral wall of the sliding member (5) is provided with an upper limiting plate (52) and a lower limiting plate (53) arranged at intervals from top to bottom, the upper limiting plate (52) is located below the inclined surface (51), and the bottom wall plate of the connecting seat (31) is located between the upper limiting plate (52) and the lower limiting plate (53).

8. The cleaning machine of claim 6, wherein: Further comprising a driving mechanism (6) for driving the secondary spray arm (3) to move up and down, and the power output end of the driving mechanism (6) is drivingly connected with the secondary spray arm (3).

9. The cleaning machine of claim 8, wherein: The driving mechanism (6) comprises a motor (61) and a vertically extending screw rod (62), the screw rod (62) is mounted on the output shaft of the motor (61), and the sliding member (5) is provided with an internal screw hole in threaded connection with the screw rod (62).

10. The cleaning machine of claim 1, wherein: The secondary spray arm (3) has a state of being located below the primary spray arm (2), and in this state, the blocking member blocks the water outlet (202) of the primary spray arm (2).

11. The cleaning machine of claim 1, wherein: The blocking member is a valve plate (21) rotatably arranged at the water outlet (202), the valve plate (21) is located in the main flow channel (20), and the valve plate (21) comprises a blocking part (211) and a connecting part connected with the primary spray arm (2), the connecting part is an elastic sheet (212) making the blocking part (211) always have a tendency to move towards the closed water outlet (202).

12. The cleaning machine of any one of claims 1 to 11, wherein: The cross section of the cleaning tank (1) is square, the secondary spray arm (3) has four, and is respectively arranged at the four corners of the washing chamber (10), and each secondary spray arm (3) corresponds to one push member (4).

13. The cleaning machine of claim 12, wherein: The opposite two side walls of the primary spray arm (2) are provided with the water outlet (202), in the state of being rotated along the diagonal direction of the washing chamber (10), the primary spray arm (2) is connected with at least one secondary spray arm (3) located on the diagonal line, and is in fluid communication with the secondary flow channel (30) of the secondary spray arm (3).

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