Alternating stepping type cleaning device and method for transverse blades of louver

Abstract

The invention discloses an alternate stepping type cleaning device and method for transverse blades of a louver, and belongs to the technical field of building smoke prevention and exhaust system maintenance equipment. The device comprises sliding rail systems fixed to the upper inner wall and the lower inner wall of a rectangular frame and a vertically-arranged sweeping assembly. The sweeping assembly comprises a vertical mounting rod, an up-down sliding part and a plurality of sweeping brush assemblies. The two ends of the vertical mounting rod are spherical ends, and an ellipsoidal matching space for containing the spherical ends and a ball force transmission mechanism are arranged in the sliding piece. The upper part and the lower part of the vertical mounting rod are alternately purged by air flow, so that the vertical mounting rod generates inclined motion, and up-down alternate stepping type advancing is realized. A spiral groove is formed in the inner wall of the cleaning brush assembly and matched with the elastic ball on the mounting rod, and the rotary rising compound motion is generated under the action of airflow. The whole-course point contact force transmission design is adopted, and clamping stagnation caused by dust accumulation is effectively prevented; when the inclination angle reaches the limit, the balls generate the wedge-caulking effect, and the airflow achieves the dual functions of driving and sweeping at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building smoke exhaust system maintenance equipment, in particular to an alternating step type automatic cleaning device for horizontal blades of a louver and a cleaning method. BACKGROUND

[0002] The normally open smoke vent is a fixed opening in the building smoke exhaust system for natural or mechanical smoke exhaust. Its core feature is to keep open in daily life, and it can maintain ventilation function without triggering fire signal.

[0003] The normally open smoke vent usually adopts a louver structure, including a rectangular frame 01, a vertical blade group 02 and a horizontal blade group 03. The rectangular frame 01 is usually made of aluminum alloy, and the four edges are welded into a rigid frame, which is installed at the opening of the air pipe to provide a support base for the blade group. The vertical blade group is composed of multiple vertical blades evenly distributed on the outside of the frame for adjusting the left and right wind direction. The horizontal blade group is composed of multiple horizontal blades evenly distributed on the inside of the frame for adjusting the up and down wind direction. The typical value of the blade spacing of the vertical blade group and the horizontal blade group is 25mm, and each blade has a certain rotational resistance to maintain a preset angle.

[0004] In addition, the vertical blade group 02 and the horizontal blade group 03 refer to the attached drawings Figure 3 The overall spacing on the Y-axis is usually 10-15mm.

[0005] According to the requirements of the "Building Design Fire Protection Code", the smoke vent needs to be regularly maintained to ensure the smoke exhaust efficiency.

[0006] However, in actual use, the normally open smoke vent is continuously exposed to air, and the blade surface will accumulate a large amount of dust within 1-2 years, which seriously affects the ventilation and smoke exhaust efficiency. The traditional cleaning method usually uses strong wind to blow from the outside to the inside, which has the following technical problems: (1) The horizontal blades are located on the inside and are partially blocked by the vertical blades, so there are many dead angles and the effect is not good; (2) The strong wind blowing will damage the preset guide angle of the blades, affecting the smoke flow distribution; (3) The horizontal blades are not easy to observe the cleaning effect and adjust the preset guide angle from the outside, and the cleaning workers are difficult to restore the original design angle; (4) The number of smoke vents in large buildings is large, and manual cleaning is low in efficiency and high in cost.

[0007] Some attempts have been made to clean the louver in the prior art. For example, CN114515119B discloses a dust removal device that reverses multiple louver blades simultaneously through a motor-driven gear system, and uses upper and lower cleaning brushes to clean both sides of the blades. However, such devices require the blades to have a rotating function, which is not suitable for the blade system with fixed angles in the normally open smoke vent. More importantly, forcibly rotating the blades will damage the designed guide angle of the smoke vent, affecting the smoke exhaust efficiency, which violates the basic requirements of the fire protection code.

[0008] Especially for the horizontal blades, due to the particularity of the installation position, which is located inside the shutter and the upper part is blocked by the building top surface and the front is blocked by the vertical blades, the conventional cleaning means is difficult to effectively reach. This not only affects the daily ventilation effect, but more importantly, when a fire occurs, the smoke exhaust efficiency may be reduced due to dust accumulation on the blades, which endangers the safety of personnel evacuation.

[0009] More importantly, the normally open smoke exhaust port is mainly used in underground garages and is usually installed at a position close to the top of the garage about 3 meters from the ground. The cleaning personnel need to use a ladder or a lengthened nozzle to clean, and if the cleaning device is not stable enough, for example, it is prone to jamming, the maintenance operation is inconvenient and there is a safety hazard. Therefore, the cleaning device must have excellent anti-jamming performance to ensure stable operation.

[0010] Therefore, it is necessary to develop an automatic cleaning device specially for the horizontal blades of the shutter of the normally open smoke exhaust port. The device should be able to effectively remove dust without damaging the preset angle of the blades, adapt to the special installation position of the horizontal blades, and realize automatic or semi-automatic operation to reduce maintenance costs. SUMMARY

[0011] The purpose of the present application is to provide an alternating step automatic cleaning device and method for horizontal blades of a shutter, aiming to solve the technical problems of difficult cleaning and low efficiency of existing shutters, especially the automatic cleaning needs of shutters in high-altitude environments such as underground garages.

[0012] To achieve the above-mentioned purpose, the present application provides an alternating step automatic cleaning device for horizontal blades of a shutter, which comprises an upper slide rail and a lower slide rail fixedly installed on the upper and lower inner walls of a rectangular frame respectively, and a cleaning assembly vertically arranged.

[0013] The cleaning assembly comprises a vertical installation rod, an upper sliding member and a lower sliding member movably connected to the upper and lower ends of the vertical installation rod respectively, and a plurality of cleaning brush assemblies distributed along the body of the vertical installation rod. The upper sliding member and the lower sliding member are respectively slidably connected with the upper slide rail and the lower slide rail.

[0014] The core innovation of the present application lies in the unique spherical connecting force transmission mechanism. The upper and lower ends of the vertical mounting rod are designed as spherical end portions, including a spherical head and a neck connecting the spherical head and the rod body. Correspondingly, the upper and lower sliding members are each provided with a matching space accommodating the spherical end portion, and a ball is arranged in the matching space between the spherical head and the sliding member. This structure can effectively transmit the thrust generated when the vertical mounting rod is tilted to the sliding member. Under normal inclination angle, the thrust drives the sliding member to smoothly slide along the sliding rail; when the inclination angle reaches the preset limit angle (12°-15°), the thrust causes the ball to produce a wedging effect to form self-locking, ensuring the safety of the device.

[0015] In the specific structural design, the working part of the upper and lower sliding rails adopts a circular arc light rod structure, and the surface is polished to prevent dust accumulation. The sliding rail matching part of the upper and lower sliding members is an open concave arc surface with a covering angle greater than 180° (preferably 200°-220°), which ensures smooth sliding and prevents accidental disengagement.

[0016] The matching space is designed as an ellipsoidal space with the long axis arranged along the axial direction of the vertical mounting rod to adapt to the swinging of the vertical mounting rod. Two ball accommodating holes are arranged in the horizontal direction between the matching space and the concave arc surface, and one ball is placed in each ball accommodating hole to realize bidirectional driving function. The diameter of the spherical head is 85%-90% of the short axis size of the matching space, and the diameter of the neck is 60%-70% of the diameter of the spherical head. The bottom surface of the matching space is designed as a waist shape, and the waist of the waist shape limits the lateral swinging of the neck to strictly control the lateral displacement.

[0017] The cleaning brush assembly adopts an innovative rotary lifting structure. Each cleaning brush assembly includes a sleeve body rotatably sleeved on the vertical mounting rod and a bristle assembly. The inner wall of the sleeve body is provided with an arc spiral groove with a spiral angle of 15°-25° and a groove depth of 1.5-2 mm. The rod body of the vertical mounting rod is provided with a limiting and guiding elastic ball matched with the arc spiral groove, which is made of silicone rubber material, and the ball body protrudes by 60%-70% of the ball diameter. The bristle assembly is uniformly distributed with 3-4 rows of bristle bundles on the outer circumference of the sleeve body, and each row of bristle bundle extends axially by 30-40 mm, and the free end of the bristle is 35-45 mm long.

[0018] The spacing between adjacent cleaning brush assemblies corresponds to the spacing between the blades of the transverse blade group, ensuring that each blade can be effectively cleaned. To facilitate maintenance, the vertical mounting rod is designed as a detachable upper rod segment and lower rod segment structure.

[0019] The application also provides a method for cleaning the shutter by using the device.

[0020] Compared with the prior art, the application has the following beneficial effects: 1. Alternating step-by-step movement mode: the continuous and smooth step-by-step movement is realized by alternating driving up and down, the movement trajectory is controllable, and the cleaning coverage is comprehensive.

[0021] 2. Spherical connection force transmission mechanism: the force transmission is designed by point contact throughout the process, the contact area is extremely small, the friction resistance is significantly reduced, dust particles are difficult to accumulate, and the sticking problem of traditional sliding mechanisms is effectively avoided.

[0022] 3. Compound cleaning mode: the "rotation + vibration + upward movement" compound movement of the cleaning brush assembly, combined with the blowing effect of the airflow itself, realizes the "driving + cleaning" dual function, and the cleaning effect is remarkable.

[0023] 4. Strong self-cleaning ability: the smooth sliding rail surface, the rolling ball and the spiral movement of the cleaning brush have self-cleaning function during the working process, and are not easy to accumulate dust and stick for a long time.

[0024] 5. Simple and reliable structure: without complex driving system, all functions can be realized by relying on airflow only, maintenance is convenient, and it is especially suitable for use in industrial environments such as underground garage. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a real photo of the application environment, showing the shutter system installed on the top of the underground garage.

[0026] Figure 2 It is a front view structural schematic diagram of the device of the application, showing the overall arrangement of the rectangular frame 01, the horizontal blade group 03, and the installation position of the cleaning assembly 20, the upper sliding rail 10a and the lower sliding rail 10b.

[0027] Figure 3 It is a three-dimensional structural schematic diagram of the device of the application, showing the spatial relationship of the rectangular frame 01, the vertical blade 02 and the horizontal blade group 03, and the overall structure of the cleaning assembly 20.

[0028] Figure 4Figure 1 is a partial perspective view of the cleaning assembly of the present application, showing the vertical mounting rod 21, the upper sliding member 22a, the cleaning brush assembly 23 and the cooperation with the upper side sliding rail 10a, the lower side sliding rail 10b and the horizontal blade group 03.

[0029] Figure 5 Figure 2 is an exploded view of the spherical connecting force transmission mechanism of the present application, showing the assembly relationship of the spherical head 211, the neck 212 and the sliding member 22a.

[0030] Figure 6 Figure 3 is a structural view of the vertical mounting rod 21 of the present application, showing the arrangement of the spherical head 211, the neck 212, the limiting and guiding elastic ball 213 and the cleaning brush assembly 23 (including the sleeve body 231 and the bristle assembly 233).

[0031] Figure 7 Figure 4 is a motion trajectory view of the cleaning working state of the present application, showing the contact relationship between the cleaning brush assembly 23 and the horizontal blade, and the working position of the upper sliding member 22a under the action of the air flow.

[0032] Figure 8 Figure 5 is a perspective structural view of the cleaning brush assembly 23 of the present application, showing the contact relationship between the spherical head 211 and the ball b4 of the upper sliding member 22a.

[0033] Figure 9 Figure 6 is a sectional view of the lower sliding member 22b of the present application, showing the structural relationship of the concave arc surface b1, the cooperation space b2, the ball accommodating hole b3 and the ball b4.

[0034] Figure 10 Figure 7 is another angle sectional view of the lower sliding member 22b of the present application, showing the waist-shaped bottom surface structure of the cooperation space b2 and the installation position of the ball b4.

[0035] Figure 11 Figure 8 is an enlarged perspective structural view of the cleaning brush assembly 23 of the present application, showing the structural details of the sleeve body 231, the arc-shaped spiral groove 232 and the bristle assembly 233 in detail.

[0036] Figure 12 Figure 9 is a photograph of the louver and the cooperation of the upper sliding member and the vertical mounting rod of the present application.

[0037] Legend of reference signs: 01-rectangular frame; 02-vertical blade; 03-horizontal blade group.

[0038] 10a-upper side sliding rail; 10b-lower side sliding rail.

[0039] 20-cleaning assembly; 21-vertical mounting rod; 22a-upper sliding member; 22b-lower sliding member; 23-cleaning brush assembly.

[0040] 211 - spherical head; 212 - neck; 213 - limiting and guiding elastic ball.

[0041] 231 - sleeve body; 232 - arc spiral groove; 233 - bristle assembly.

[0042] b1 - concave arc surface; b2 - matching space; b3 - ball accommodating hole; b4 - ball. DETAILED DESCRIPTION EMBODIMENT

[0043] An alternating step automatic cleaning device for the type of shutter transverse blades described in the background art comprises upper and lower slide rails 10a and 10b respectively fixedly installed on the upper and lower inner walls of a rectangular frame 01, and a swing-in cleaning assembly 20 vertically arranged and having upper and lower ends respectively slidably connected with the upper and lower slide rails 10a and 10b.

[0044] The working parts of the upper and lower slide rails 10a and 10b adopt a round arc light pole structure, preferably with the pole surface polished, which has the following advantages: (1) the smooth surface is not easy to accumulate dust; (2) even if there is a small amount of dust accumulation, it will be automatically cleaned during the operation of the sliding parts; (3) the phenomenon of jamming caused by dust accumulation is avoided.

[0045] The swing-in cleaning assembly 20 comprises a vertical installation pole 21, upper and lower slide members 22a and 22b respectively movably connected to the upper and lower ends of the vertical installation pole 21, and a plurality of cleaning brush assemblies 23 evenly distributed along the pole body of the vertical installation pole 21.

[0046] The upper and lower slide members 22a and 22b are completely identical in structure but are installed in mirror image. Referring to the drawings Figure 9 and the drawings Figure 10 The main structure of the lower slide member 22b comprises: Slide rail matching part: the matching surface of the working part of the lower slide rail 10b is an open concave arc surface b1, the curvature radius of the concave arc surface b1 is 0.2-0.5mm larger than that of the lower slide rail 10b, forming a proper matching gap, which not only ensures smooth sliding but also prevents disengagement. The covering angle of the concave arc surface b1 to the lower slide rail 10b is 200°-220°, ensuring that it will not accidentally disengage under various working conditions. To disengage, the elastic outward expansion of the open part of the concave arc surface b1 is required; Installation pole connecting part: refer to the drawings Figure 10A solid portion integrally formed with the concave arc surface b1 is provided in the Z-axis direction. A fitting space b2 is formed within the portion to accommodate the end of the vertical mounting rod 21. Fitting space b2 is an ellipsoidal space with its major axis along the Z-axis and its minor axis along the XY plane to accommodate the swinging motion of the vertical mounting rod 21. Force Transmission Mechanism: Two ball-receiving holes b3 are spaced along the X-axis between the mating space b2 and the concave curved surface b1. Their diameter is 0.1-0.2mm larger than that of the ball b4. A ball b4 is placed in each hole b3. The use of two balls b4 enables bidirectional drive: during forward purge, the front ball b4 transmits force; when reverse adjustment or return cleaning is required, the rear ball b4 transmits force, enabling flexible back-and-forth cleaning operations.

[0047] Correspondingly, the upper and lower ends of the vertical mounting rod 21 are designed. Figure 6 Both ends of the vertical mounting rod 21 are designed as spherical ends, including: a spherical head 211: the diameter is 85%-90% of the short axis size of the matching space b2, and the surface is a standard spherical surface; a neck 212: a transition section connecting the spherical head 211 and the rod body, with a diameter of 60%-70% of the diameter of the spherical head 211. Figure 10 The coordinate system and the attached Figure 9 Although the matching space b2 is ellipsoidal, the gap design in different directions is obviously different. The bottom surface of the matching space b2 is waist-shaped, and the "waist" of the waist corresponds exactly to the Y-axis direction, forming a narrowed area, that is, the range of motion of the neck 212 on the Y-axis is limited, strictly limiting lateral swing.

[0048] Anti-jamming working principle: (1) Basic force transmission process: When vertical mounting rod 21 tilts along the X-axis due to airflow, spherical head 211 moves in the tilted direction, pushing ball b4 on that side. Ball b4 is squeezed between spherical head 211 and concave arc surface b1, transmitting the thrust to lower slide 22b, driving it to slide along lower rail 10b.

[0049] (2) Point contact anti-stuck design: The core anti-jamming mechanism of this device lies in the full-point contact force transmission design. Specifically, it includes three key contact interfaces: The spherical head 211 and the ball b4: spherical surface to spherical surface, forming a single point contact; Ball b4 and concave arc surface b1: The ball faces the arc surface, forming a point contact within the linear area; Ball b4 and lower slide rail 10b (limit state): the spherical surface is in point contact with the cylindrical surface; This pure point contact method has three advantages: first, the contact area is extremely small, and the friction resistance is significantly reduced; second, dust particles are difficult to accumulate at the point of contact, and even a small amount of dust can be automatically removed by the rolling ball; third, there is no "suction" effect caused by flat fitting, avoiding the sudden change in static friction force commonly seen in traditional sliding mechanisms.

[0050] (3) Self-limiting anti-overload mechanism: As the inclination angle gradually increases, the contact point between the spherical head 211 and the ball b4 gradually moves upward. When the preset limit angle (about 12°-15°) is reached, the contact point moves to the maximum diameter position of the spherical head 211. At this time, two key changes occur: Change in thrust direction: the thrust on the ball b4 changes from mainly along the X-axis to containing a significant Y-axis component; Forming a double limit: the displacement of the ball b4 in the Y-axis direction causes it to simultaneously contact the inner concave arc surface b1 and the lower slide rail 10b, forming a "wedge" effect and creating a self-locking effect.

[0051] This self-limiting mechanism converts the risk of excessive inclination into stable mechanical limiting, preventing the device from losing control and protecting the mechanism from damage, ensuring absolute safety in the high-altitude working environment of underground garages.

[0052] Swing-in cleaning process: The device works in a gas flow sweeping driving mode. First, the gas flow is directed to the upper part of the vertical installation rod 21 through the nozzle, and the impact force causes the upper end of the vertical installation rod 21 to tilt along the X-axis direction. Through the above transmission mechanism, the upper sliding part 22a is pushed to slide forward along the upper slide rail 10a, driving the entire cleaning assembly 20 to swing in. When the upper end reaches the end of the stroke and completes the cleaning operation, the blowing on the upper part is stopped, and the lower part of the vertical installation rod 21 is blown in the same direction. The gas flow thrust causes the lower end to tilt in the same direction, pushing the lower sliding part 22b to slide forward along the lower slide rail 10b, achieving a "alternating up and down, gas flow driving" swing-in motion. In this process, the blowing gas flow not only provides the driving force, but also produces a wind force on the cleaning brush assembly 23, causing the cleaning brush assembly 23 to vibrate and swing, cooperating with the blowing effect of the gas flow itself to effectively clean the surface of the transverse blade, achieving the dual functions of "driving + cleaning".

[0053] In some embodiments, the cleaning brush assembly 23 is designed as follows: Referring to the accompanying Figure 6 The cleaning brush assembly 23 is evenly distributed along the shaft of the vertical installation rod 21, and the spacing between adjacent broom modules corresponds to the spacing between the blades of the transverse blade group 03, with a typical value of 25mm. Each cleaning brush assembly 23 includes: Sleeve body 231: It is a hollow cylindrical structure with an inner diameter 2-3 mm larger than the outer diameter of the vertical mounting rod 21, forming a rotatable, sliding fit. The inner wall of sleeve body 231 is provided with an arcuate spiral groove 232 with a helix angle of 15°-25° and a depth of 1.5-2 mm. The groove width matches the diameter of the stop and guide elastic ball 213.

[0054] Limiting and guiding elastic ball 213: Figure 6 As shown, on the rod body of the vertical mounting rod 21, a limit and guide elastic ball 213 is provided corresponding to the installation position of each cleaning brush assembly 23. The elastic ball is made of silicone rubber, which has good elasticity and wear resistance. It is fixed to the surface of the vertical mounting rod 21 by an elastic socket, and the protrusion height of the ball is 60%-70% of the ball diameter.

[0055] Bristle assembly 233: Three to four rows of bristle bundles are evenly distributed around the outer circumference of sleeve body 231. Each row of bristles extends axially for 30 to 40 mm. The bristles are preferably made of nylon or PBT (polybutylene terephthalate) fibers, with a diameter of 0.2 to 0.3 mm, exhibiting excellent elasticity and wear resistance. The free ends of the bristles are designed to be 35 to 45 mm long to ensure adequate contact with the lateral blade surface during the purge process.

[0056] Working mechanism of cleaning brush assembly 23: When the purge airflow acts on the cleaning brush assembly 23, each cleaning brush assembly 23 has a certain rotation angle and rising space. Specifically, the airflow impacts the bristle assembly 233, and the asymmetric torque generated causes the sleeve body 231 to have a rotation tendency; The cooperation between the limiting and guiding elastic ball 213 and the arc-shaped spiral groove 232 converts the rotational motion into a spiral ascending motion; When the cleaning brush assembly 23 rises to the limit position (about 5-8 mm), the elastic ball 213 reaches the end of the spiral groove 232, preventing further rise; after the airflow stops, the cleaning brush assembly 23 rotates in the opposite direction along the spiral groove under the action of its own weight to reset.

[0057] This "rotation + rise" compound movement mode enables the bristles to produce a multi-directional cleaning effect on the surface of the lateral blades, effectively removing stubborn dust.

[0058] In some embodiments, the vertical mounting rod 21 can be split and disconnected from the middle, which facilitates the installation and replacement of the cleaning brush assembly 23. Specifically, the vertical mounting rod 21 is designed as an upper rod section and a lower rod section, which are connected in the middle by a detachable connecting mechanism. Example

[0059] This embodiment provides an airflow-driven swing-in automatic cleaning method, which achieves comprehensive cleaning of the horizontal blades of the blinds by alternating up and down sweeping.

[0060] Specific cleaning steps: Step 1: Initial positioning; place the swing-in cleaning assembly 20 at the starting position of the rectangular frame 01, ensure that the upper slide 22a and the lower slide 22b are correctly clamped into the upper side rail 10a and the lower side rail 10b respectively, and the vertical mounting rod 21 remains vertical.

[0061] Step 2: Upper drive cleaning; start the air jet nozzle and direct the upper area (upper 1 / 2 section) of the vertical mounting rod 21 for directional blowing; blowing angle: 15°-20° angle with the vertical direction; air flow pressure: 0.3-0.5 MPa; duration: 3-5 seconds; effect: the upper end of the vertical mounting rod 21 tilts forward by 8°-12°, the spherical head 211 pushes the ball b4, and the upper slide 22a is driven to slide forward along the upper side rail 10a by 20-30 mm.

[0062] Step 3: Middle cleaning operation; while the upper drive is in progress, the air flow acts on the upper and middle cleaning brush assembly 23, each cleaning brush assembly 23 rotates under the impact of the air flow, with a rotation angle of 15°-25°, and through the cooperation of the limiting and guiding elastic ball 213 and the arc spiral groove 232, the cleaning brush assembly 23 spirally rises by 5-8 mm, and the brush assembly 233 cleans the corresponding position of the horizontal blade with a "rotation + vibration + upward" combined motion mode.

[0063] Step 4: Lower drive cleaning; stop the upper blowing and switch to the same direction blowing on the lower area (lower 1 / 2 section) of the vertical mounting rod 21; the blowing parameters are the same as the upper part, and the lower slide 22b slides forward along the lower side rail 10b by 40-60 mm, realizing the overall "swing-in" motion.

[0064] Step 5: Reciprocating cleaning cycle; Repeat steps 2-4 to form a continuous "swing-in" motion of "up-in-down-in-up-in"; according to the width of the louver, the entire horizontal stroke is completed in a cycle.

[0065] Step 6: Reverse return cleaning; after reaching the end point, change the air flow blowing direction to be consistent with the return direction. Use the reverse force transmission function of the rear ball b4 to realize the return cleaning; the cleaned area is cleaned again during the return process.

[0066] Step 7: Cleaning completion reset; Stop the air flow blowing, and the cleaning brush assembly 23 reversely rotates and resets along the spiral groove under the action of gravity, and the cleaning assembly 20 moves back to the initial position under the action of the air flow or stops at the desired position.

Claims

1. An alternating step-by-step automatic cleaning device for the transverse blades of a Venetian blind, characterized in that: include: An upper slide rail (10a) and a lower slide rail (10b) are fixedly mounted on the upper and lower inner walls of the rectangular frame (01) respectively; A vertically arranged swing-in cleaning assembly (20), comprising a vertical mounting rod (21), an upper sliding member (22a) and a lower sliding member (22b) movably connected to upper and lower ends of the vertical mounting rod (21), and a plurality of cleaning brush assemblies (23) distributed along the rod body of the vertical mounting rod (21); The upper sliding member (22a) and the lower sliding member (22b) are slidably connected to the upper sliding rail (10a) and the lower sliding rail (10b) respectively; The upper and lower ends of the vertical mounting rod (21) are both spherical ends, including a spherical head (211) and a neck (212) connecting the spherical head and the rod body; The upper sliding member (22a) and the lower sliding member (22b) are both provided with a matching space (b2) for accommodating the spherical end, and a ball (b4) arranged in the matching space (b2). The ball (b4) is located between the spherical head (211) and the sliding member and is used to transmit the thrust generated when the vertical mounting rod (21) is tilted to the sliding member; at a normal tilt angle, the thrust drives the sliding member to slide along the slide rail; when a preset limit angle is reached, the thrust causes the ball (b4) to produce a wedging effect to form a self-locking effect.

2. The alternating step-by-step automatic cleaning device for the transverse blades of a Venetian blind according to claim 1, characterized in that: The working parts of the upper slide rail (10a) and the lower slide rail (10b) adopt an arc-shaped polished rod structure; The slide rail matching parts of the upper sliding member (22a) and the lower sliding member (22b) are open concave arc surfaces (b1), and the covering angle of the concave arc surface (b1) to the slide rail is greater than 180 degrees.

3. The alternating step-by-step automatic cleaning device for the transverse blades of a Venetian blind according to claim 1 or 2, characterized in that: The matching space (b2) is an ellipsoidal space, with the major axis arranged along the axial direction of the vertical mounting rod; Two ball receiving holes (b3) are arranged between the matching space (b2) and the inner concave arc surface (b1) at intervals in the horizontal direction, and a ball (b4) is placed in each ball receiving hole (b3).

4. The alternating step-by-step automatic cleaning device for the transverse blades of a Venetian blind according to claim 3, characterized in that: The diameter of the spherical head (211) is 85%-90% of the minor axis size of the fitting space (b2); The diameter of the neck (212) is 60%-70% of the diameter of the spherical head (211); The bottom surface of the matching space (b2) is waist-shaped, and the waist of the waist forms a lateral swing restriction for the neck (212).

5. The alternating step-by-step automatic cleaning device for the transverse blades of a Venetian blind according to claim 1, characterized in that: The cleaning brush assembly (23) comprises a sleeve body (231) and a bristle assembly (233); The sleeve body (231) is rotatably sleeved on the vertical mounting rod (21), and an arc-shaped spiral groove (232) is provided on the inner wall of the sleeve body (231); A limiting and guiding elastic ball (213) that cooperates with the arc-shaped spiral groove (232) is provided on the rod body of the vertical mounting rod (21).

6. The alternating step-by-step automatic cleaning device for the transverse blades of a Venetian blind according to claim 5, characterized in that: The arc-shaped spiral groove (232) has a helix angle of 15°-25° and a groove depth of 1.5-2 mm; The limiting and guiding elastic ball (213) is made of silicone rubber, and the protruding height of the ball is 60%-70% of the ball diameter.

7. The alternating step-by-step automatic cleaning device for the transverse blades of a Venetian blind according to claim 5 or 6, characterized in that: The bristle assembly (233) has 3-4 rows of bristle bundles evenly distributed on the outer circumference of the sleeve body (231); The axial extension length of each row of bristle bundles is 30-40 mm, and the free end length of the bristles is 35-45 mm.

8. The alternating step-by-step automatic cleaning device for the transverse blades of a Venetian blind according to claim 1, characterized in that: The spacing between adjacent cleaning brush assemblies (23) corresponds to the blade spacing of the transverse blade group (03); the vertical mounting rod (21) is designed as an upper rod section and a lower rod section that are detachably connected.

9. The alternating step-by-step automatic cleaning device for the transverse blades of a Venetian blind according to any one of claims 1, 2, 5, and 6, characterized in that: When the vertical mounting rod (21) tilts under the action of an external force, the spherical head (211) pushes the ball (b4) on the same side, and the ball (b4) transmits the thrust to the sliding member, driving the sliding member to slide along the slide rail; When the tilt angle reaches a preset limit angle of 12°-15°, the ball (b4) contacts the concave arc surface (b1) and the slide rail at the same time, forming a self-locking limit.

10. A method for cleaning blinds using the device according to claim 1, characterized in that: The following steps are involved: S1: placing the swing-in cleaning assembly (20) at the starting position of the rectangular frame (01); S2: Directed airflow is blown on the upper area of ​​the vertical mounting rod (21), so that the upper end of the vertical mounting rod (21) tilts forward, and the upper sliding member (22a) is driven to slide forward along the upper slide rail (10a) through the force transmitted by the ball (b4); S3: Stop the upper purge and purge the lower area of ​​the vertical mounting rod (21) with the same direction of airflow, driving the lower sliding member (22b) to slide forward along the lower slide rail (10b); S4: Repeat steps S2-S3 to form an alternating up and down swinging motion; S5: When the airflow acts on the cleaning brush assembly (23), the cleaning brush assembly (23) rotates and rises along the spiral groove to clean the transverse blades.

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