Dust collector test system

Abstract

The invention relates to a dust collector test system, which comprises a sealing box provided with a sealing cavity, the sealing box is provided with a butt joint port used for being in butt joint with a dust collection pipe of a dust collector and an air inlet used for enabling external air to enter the sealing box, and the air inlet is provided with a sealing piece; the air inlet flow switching module comprises a plurality of air inlet covers, a first air cylinder and a second air cylinder, the air inlet volumes of openings of the air inlet covers are different, the first air cylinder drives one air inlet cover to move to the butt joint position where the air inlet covers are in butt joint with the air inlet, and the second air cylinder drives the air inlet cover located at the butt joint position to move towards the air inlet so as to abut against the sealing piece. The air inlet is in butt joint with the air inlet; the sealing piece is provided with a plurality of step parts, and the control system controls the second air cylinder to push the air inlet cover to move towards the sealing piece according to the air inlet amount of the air inlet cover so as to control the sealing contact area between the air inlet cover and the sealing piece.

Description

Technical Field

[0001] The invention relates to the field of vacuum cleaner testing, in particular to a vacuum cleaner testing system. Background Art

[0002] In the vacuum cleaner manufacturing industry, performance testing of vacuum cleaners is a crucial link. Among them, the vacuum cleaner's dust collection efficiency is a key indicator for evaluating its quality. Traditional vacuum cleaner testing systems often use a single air intake volume, which limits the accuracy and applicability of the test results. When testing vacuum cleaners of different models / with different dust collection tubes, since the dust collection tubes of the vacuum cleaners have different sizes and dust collection efficiencies, a single air intake volume is difficult to meet the diverse testing needs.

[0003] In order to accurately evaluate the vacuum efficiency of vacuum cleaners under different working conditions, existing systems use replaceable air inlet hoods with different air inlet volumes. However, these systems generally use a single-structure seal to achieve the seal between the vacuum box and the air inlet hood. This design often ignores the specific impact of different air inlet volumes on the sealing effect, and the quality of the sealing effect is directly related to the accuracy of the test results. Therefore, the existing sealing solutions have obvious deficiencies in adapting to diverse working conditions and ensuring test accuracy. Summary of the invention

[0004] The object of the present invention is to provide a vacuum cleaner testing system which can achieve good sealing effect and ensure the accuracy of the test while meeting the requirements of different air intake tests.

[0005] To achieve the above object, the present invention provides the following technical solution: a vacuum cleaner testing system, the vacuum cleaner testing system comprising: Tooling to mount the vacuum cleaner being tested; A sealing box is arranged on one side of the tooling, the sealing box has a sealing cavity, the sealing box is provided with a docking port for docking with the dust suction pipe of the vacuum cleaner and an air inlet for allowing external gas to enter the sealing box, and a sealing member is arranged on the air inlet; An air intake flow switching module comprises a plurality of air intake covers, a first cylinder and a second cylinder, the air intake volumes of the openings of the plurality of air intake covers are different, the first cylinder drives one of the air intake covers to move to a docking position docking with the air inlet, and the second cylinder drives the air intake cover at the docking position to move toward the direction of the air inlet to abut against the sealing member, so that the air intake cover docks with the air inlet; A control system, electrically connected to the power supply unit and the control unit of the vacuum cleaner, and used to control the operation of the first cylinder and the second cylinder; Wherein, the sealing member has a plurality of step portions, and the control system controls the second cylinder to push the air inlet hood to move toward the sealing member according to the air intake volume of the air inlet hood, so as to control the sealing contact area between the air inlet hood and the sealing member; The control system calculates the stroke of the second cylinder according to the air intake volume of the air intake cover to be connected to the air inlet, the deformation of the step portion and the number of step portions to be connected to the air intake cover, and the sealing requirements required for the air intake volume of the air intake cover to be connected to the air inlet, so as to control the sealing contact area between the air intake cover and the sealing member; the stroke of the second cylinder The calculation method is as follows: , in, Represents the air intake volume; Represents the deformation of the step; Represents the number of steps that the air inlet cover needs to connect to; The pressure value used to represent the sealing requirement; , , represents the proportionality coefficient; Stands for basic stroke value, which is the minimum stroke of the cylinder without additional load or demand.

[0006] Furthermore, the plurality of step portions are in a concentric ring structure, the cross-sectional dimensions of the plurality of step portions are the same, and the heights of the plurality of step portions decrease successively from the inside to the outside.

[0007] Furthermore, the sealing member is made of silicone with a hardness of 40 Shore A, and the height difference between two adjacent step portions is 2 mm.

[0008] Furthermore, the seal has a main body and an inner edge portion extending downward from the main body, the step portion is formed on the main body, the inner edge portion fits the inner wall of the air inlet, and a linear air inlet hole is formed on the seal that passes through the main body and the inner edge portion, and the inner diameter of the air inlet hole is larger than the largest opening of the air inlet hood in the air inlet hood.

[0009] Furthermore, the air inlet flow switching module includes an air hood seat and a displacement plate arranged on the air hood seat, the air hood seat includes an upper fixed plate and a lower fixed plate arranged relatively to each other along the height direction, and two sliding rods installed between the upper fixed plate and the lower fixed plate, the two sides of the displacement plate are sleeved on the two sliding rods through a sleeve, the first cylinder pushes the displacement plate to move in the height direction, a plurality of the air inlet hoods are sequentially arranged on the displacement plate along the height direction, and a horizontal floating structure is arranged between each of the air inlet hoods and the displacement plate.

[0010] Furthermore, the second cylinder is fixed to the sealing box through a cylinder fixing frame, the number of the second cylinders is two, each of the air inlet hoods extends toward the direction of the sliding rod to form an ear, the two second cylinders are relatively arranged on both sides of the air inlet hood, and the plunger of the second cylinder is provided with a pushing block for pushing the ear.

[0011] Furthermore, the air inlet hood includes a base plate and an air control plate installed on the rear side of the base plate, a funnel-shaped air guide portion is formed on the base plate, the air guide portion passes through the base plate, and an air control port is formed on the air control plate. Several of the air inlet hoods have the same base plate structure, and several of the air inlet hoods have different air control ports on the air control plates.

[0012] Furthermore, a docking sleeve is installed on the sealing box, and the docking sleeve is arranged on the docking port. A plug-in cavity for inserting the dust suction pipe of the vacuum cleaner is formed inside the docking sleeve. The docking sleeve has a wall body surrounding the plug-in cavity, and a contoured surface is formed at the end of the wall body for docking with the sealing ring on the vacuum cleaner.

[0013] Furthermore, the tooling includes a socket for plugging in a grip of a vacuum cleaner, a support for supporting the cyclone wind unit of the vacuum cleaner, a sliding seat for installing the socket and the support, a fixed seat arranged below the sliding seat, a sliding assembly arranged between the fixed seat and the sliding seat, and a driving member for driving the sliding seat to move relative to the fixed seat toward the direction of the sealing box.

[0014] Furthermore, a docking cavity is formed at the bottom of the holding piece, and a first terminal is provided in the docking cavity. When the vacuum cleaner is installed on the vacuum cleaner test base, the socket is inserted into the docking cavity, and a plurality of plug-in slots for plugging the first terminal are formed in the socket. A second terminal electrically connected to the first terminal is formed in the plug-in slot, and the bottom end of the second terminal protrudes out of the bottom of the socket.

[0015] The beneficial effects of the present invention are as follows: the vacuum cleaner testing system of the present application realizes switching of different air intake volumes through the first cylinder and the second cylinder through the air intake flow switching module, thereby meeting the needs of testing different dust collection performances, and by setting the seal to multiple step portions, and then controlling the second cylinder to push the air intake hood toward the seal according to the air intake volume of the air intake hood through the control system, so as to control the sealing contact area between the air intake hood and the seal, thereby achieving precise control of the sealing requirements of different air intake volumes, so that the vacuum cleaner testing system of the present application can meet the tests of different air intake volumes while ensuring a good sealing effect and ensuring the accuracy of the test.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a vacuum cleaner testing system shown in an embodiment of the present invention; Figure 2 for Figure 1 Partial structural diagram of the socket in FIG. Figure 3 for Figure 1 A cross-sectional view of a seal in FIG. Figure 4 for Figure 1 A schematic diagram of the structure of the air inlet cover; Figure 5 for Figure 4 The structure diagram of the air inlet cover in another direction is shown. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] See also Figure 1 The vacuum cleaner testing system 100 shown in a preferred embodiment of the present invention includes a tool 10 for installing a vacuum cleaner 200 to be tested, a sealing box 20 arranged on one side of the tool 10, an air inlet flow switching module 30 arranged on one side of the sealing box 20, a first air pressure measuring instrument (not shown) for detecting the air pressure in the sealing box 20, a second air pressure measuring instrument (not shown) for detecting the ambient atmospheric pressure, and a control system (not shown) for realizing electrical connection, signal processing and calculation. The control system is electrically connected to a power supply unit (not shown) and a control unit (not shown) of the vacuum cleaner 200. The air intake flow switching module 30 is connected to the sealed box 20 to switch different air intake volumes and control the air flow entering the sealed box 20. The control system controls the vacuum cleaner 200 to work, extracts the air in the sealed box 20, and reduces the air pressure in the sealed box 20. The control system performs a difference operation on the two air pressure values ​​obtained by the first air pressure measuring instrument and the second air pressure measuring instrument to obtain the power of the vacuum cleaner 200 under different air intake volumes. In some embodiments, the vacuum cleaner 200 under test has different gears, and the vacuum cleaner test system 100 can also test the power of the vacuum cleaner 200 under different gears and different air intake volumes.

[0023] Please combine Figure 2 The tool 10 includes a socket 11 for plugging in a gripping member 201 of a vacuum cleaner 200, a support member 12 for supporting a cyclone wind unit of the vacuum cleaner 200, a sliding seat 13 for installing the socket 11 and the support member 12, a fixed seat 14 disposed below the sliding seat 13, a sliding assembly 15 disposed between the fixed seat 14 and the sliding seat 13, and a driving member 16 for driving the sliding seat 13 to move relative to the fixed seat 14 toward the sealing box 20. A docking cavity (not shown) is formed at the bottom of the gripping member 201, and a first terminal is provided in the docking cavity. When the vacuum cleaner 200 is installed on the tool 10, the socket 11 is inserted into the docking cavity, and a plurality of plug-in slots for plugging in the first terminal are formed in the socket 11, and a second terminal electrically connected to the first terminal is formed in the plug-in slot, and the bottom end of the second terminal protrudes out of the bottom of the socket 11. In actual application, the second terminal is fixed in the plug housing. Figure 2The socket 11 in the embodiment is removed from the plug housing, a plug slot is formed on the plug housing, and the first terminal is inserted into the plug slot to be electrically connected to the second terminal. The second terminal includes a power terminal 111 and a signal terminal 112. The socket also includes a bottom plate 113, and the bottoms of the power terminal 111 and the signal terminal 112 protrude from the bottom plate 113. The control system is electrically connected to the power terminal 111 and the signal terminal 112 protruding from the bottom plate 113 through structures such as cables and probes to achieve power supply and signal transmission.

[0024] The sealing box 20 has a sealing cavity (not shown in the figure), and a docking port for docking with the dust suction pipe 202 of the vacuum cleaner 200 and an air inlet for allowing external gas to enter the sealing box 20 are provided on the sealing box 20. A docking tube 21 is installed on the sealing box 20, and the docking tube 21 is arranged on the docking port. A plug-in cavity for inserting the dust suction pipe 202 of the vacuum cleaner 200 is formed in the docking tube 21. The docking tube 21 has a wall body surrounding the plug-in cavity, and a contour surface (not shown in the figure) is formed at the end of the wall body for docking with the sealing ring on the vacuum cleaner 200. The docking of the contour surface and the sealing ring is conducive to improving the sealing performance. The air inlet flow switching module 30 is docked with the air inlet. A sealing member 22 is arranged on the air inlet, and when the air inlet flow switching module 30 is docked with the air inlet, the sealing is achieved by the sealing member 22.

[0025] The air intake flow switching module 30 includes a plurality of air intake covers 31, a first cylinder 32, and a second cylinder 33. The air intake volumes of the openings of the plurality of air intake covers 31 are different. The control system controls the operation of the first cylinder 32 and the second cylinder 33. The first cylinder 32 drives one of the air intake covers 31 to move to a docking position docking with the air inlet, and the second cylinder 33 drives the air intake cover 31 at the docking position to move toward the direction of the air inlet to abut against the sealing member 22, so that it docks with the air inlet.

[0026] In the prior art, a single seal is used. When the air inlet hoods 31 with different air inlet volumes are connected to the seal, the sealing contact area between the two is single, that is, the sealing contact area is a uniform constant value. In view of the differences in the air inlet volumes of each air inlet hood 31 of the present application, during the specific implementation process, the R&D personnel found that if a uniform sealing contact area is used for all air inlet hoods 31, the following problems will occur: if the sealing contact area is set to the value required by the air inlet hood 31 based on the maximum air inlet volume, although the sealing can be ensured, the excessive contact area will undoubtedly aggravate the wear of the seal, thereby accelerating its aging and failure process, shortening its service life and increasing maintenance costs; on the contrary, if the sealing contact area is set too small and cannot meet the sealing requirements of the air inlet hood 31 with a larger air inlet volume, it will cause gas leakage, seriously affecting the accuracy and reliability of the test.

[0027] To solve this problem, combine Figure 3In the present application, the sealing member 22 is configured to have a plurality of step portions 221. The control system controls the second cylinder 33 to push the air inlet hood 31 toward the sealing member 22 according to the air intake volume of the air inlet hood 31, so as to control the sealing contact area between the air inlet hood 31 and the sealing member 22.

[0028] It should be noted that when the control system controls the second cylinder 33 to push the air inlet hood 31 toward the seal 22 according to the air intake volume of the air inlet hood 31, the distance that the air inlet hood 31 moves toward the seal 22 is the stroke of the second cylinder 33. As the stroke of the second cylinder 33 increases, the sealing contact area between the air inlet hood 31 and the seal 22 will increase accordingly. In this way, the air inlet hood 31 will contact the step portion 221 of the seal 22 more deeply to change the sealing effect.

[0029] The vacuum cleaner testing system 100 of the present application realizes switching of different air intake volumes through the first cylinder 32 and the second cylinder 33 via the air intake flow switching module 30 to meet the needs of testing different dust collection performances, and further, by setting the seal 22 to multiple step portions 221, and then controlling the second cylinder 33 to push the air intake hood 31 toward the seal 22 according to the air intake volume of the air intake hood 31 through the control system, so as to control the sealing contact area between the air intake hood 31 and the seal 22, thereby realizing precise control of the sealing requirements of different air intake volumes, so that the vacuum cleaner testing system 100 of the present application can meet the requirements of different air intake volume tests while ensuring a good sealing effect and ensuring the accuracy of the test.

[0030] It should also be noted that when obtaining the stroke of the second cylinder 33, the control system needs to comprehensively consider multiple factors to ensure the stability and reliability of the sealing effect. These factors include the air intake of the air inlet cover 31 of the air inlet, the deformation of the step portion 221, the number of step portions 221 that the air inlet cover 31 needs to dock with, and the sealing requirements corresponding to the air intake of the air inlet cover 31 that needs to be docked.

[0031] In this embodiment, the control system calculates the stroke of the second cylinder 33 according to the air intake volume of the air inlet hood 31 to be connected to the air inlet, the deformation amount of the step portion 221, the number of step portions 221 to be connected to the air inlet hood 31, and the sealing requirements required for the air intake volume of the air inlet hood 31 to be connected, so as to control the sealing contact area between the air inlet hood 31 and the sealing member 22; the stroke of the second cylinder 33 The calculation method is as follows: , in, Represents the air intake volume; represents the deformation amount of the step portion 221; represents the number of step portions 221 to which the air inlet cover 31 needs to be docked; The pressure value used when representing the sealing requirement reflects the pressure that the seal 22 needs to withstand; , , represents the proportionality coefficient; Represents the basic stroke value.

[0032] By adjusting the stroke of the second cylinder 33 The control system can accurately calculate the stroke of the second cylinder 33, thereby ensuring that the sealing contact area between the air inlet cover 31 and the seal 22 reaches the optimal state to meet the testing requirements of the vacuum cleaner 200 with different air intake volumes.

[0033] The air intake volume of each opening of the air intake cover 31 The air intake volume of each air inlet hood 31 is obtained through experiments and simulations. , the control system stores the corresponding data. When the air inlet cover 31 that needs to be connected to the seal 22 is known, the control system retrieves the air intake data corresponding to the air inlet cover to realize the calculation. In this embodiment, the cross-section of the opening is circular, and the air intake of each opening of the air inlet cover 31 is The calculation method is as follows: , Where r represents the radius of the opening; Represents the wind speed at the opening detected by the wind speed sensor in the test and simulation of the vacuum cleaner test system.

[0034] In this embodiment, according to the known air intake volume of the connected air intake cover 31 Calculate the number of steps 221 that the air inlet cover 31 needs to dock with , the formula used is as follows: , Represents the air intake volume; represents the sealing capacity increment provided by each step portion 221 under a specific deformation amount; Represents the efficiency factor.

[0035] Deformation of step portion 221 It refers to the deformation amount of the step portion 221 caused by the pressure when the air inlet cover 31 is connected to the step portion 221. This value is measured by experiment. In this embodiment, Take 0.5mm. Sealing requirements It refers to the pressure value that the seal 22 needs to withstand to ensure the sealing performance between the air inlet cover 31 and the air inlet. Its value is determined according to the performance requirements of the test standard. In this embodiment, The value is 5000 Pa, and the proportionality coefficient , , Obtained through previous tests or experience, it reflects the air intake volume , deformation of step portion 221 、Number of step portions 221 And sealing requirements The second cylinder 33 stroke The degree of influence, where the proportionality coefficient It reflects the direct influence of the air intake on the stroke of the second cylinder 33, and its value is 0.01; the proportionality coefficient It reflects the influence of the deformation of the step portion 221 on the stroke of the second cylinder 33, and the value is 0.05; the proportionality coefficient It reflects the reciprocal influence of the sealing requirement on the stroke of the second cylinder 33 (i.e., the higher the sealing requirement, the shorter the required stroke may be, but it is expressed in reciprocal form here), and the value is 500. Basic stroke value It is the minimum stroke of the cylinder without additional load or requirement, and its value is 10mm. The sealing capacity increment provided by each step portion 221 under a specific deformation amount , depends on the material of the seal 22, the size and shape of the step 221, the docking method of the air inlet cover 31 and the pressure conditions of the test system. In order to simplify the calculation, 90 L / min / mm is used in this embodiment. Efficiency factor Use 0.8.

[0036] In some embodiments, taking into account that the stability of the sealing system may be affected as air inlet hoods with different air intake volumes are used alternately, such as if the cylinder drive is not smooth enough or the seal is not precisely controlled enough when moving between multiple steps, errors or inconsistencies may occur during the test. The test system can also introduce airflow sensors and pressure sensors to monitor the air intake volume and sealing status in real time to ensure that the stability of the cylinder drive and the sealing effect are always maintained in the best state during the test.

[0037] In this embodiment, a plurality of step portions 221 are in a concentric ring structure, and the cross-sectional dimensions of the plurality of step portions 221 are the same. The heights of the plurality of step portions 221 decrease successively from the inside to the outside. Through this arrangement, the air inlet hoods 31 with different air inlet volumes can be connected with different numbers of step portions 221, so as to more accurately adjust the sealing effect. In addition, the concentric ring structure is easy to process and install, while ensuring the overall stability and durability of the seal 22.

[0038] In this embodiment, the seal 22 is made of silicone with a hardness of 40 Shore hardness, and the height difference between two adjacent step portions 221 is 2 mm. In this way, the air inlet hood 31 can produce a more precise adjustment of the air intake volume when docking with different numbers of step portions 221. Specifically, in this embodiment, the number of air inlet hoods 31 is 4, and the number of step portions 221 is 4. It should be noted that the thrust of the second cylinder 33 used in this embodiment is 500N, the maximum stroke is 100mm, and the response speed is 0.5 seconds. The innermost step portion 221 of the four step portions 221 is the basic step, and the width of the step surface of the step portion 221 is 5mm, which helps to ensure a tight fit and stability. The width difference of the step surface between two adjacent step portions 221 is 2mm.

[0039] The seal 22 has a main body 222 and an inner edge 223 extending downward from the main body 222, a step 221 is formed on the main body 222, the inner edge 223 fits the inner side wall of the air inlet, and a straight air inlet hole 224 is formed on the seal 22 that passes through the main body 222 and the inner edge 223, and the inner diameter of the air inlet hole 224 is larger than the opening of the air inlet hood 31 with the maximum air inlet volume in the air inlet hood 31. By fitting the inner edge 223 to the inner side wall of the air inlet, a good sealing effect can be ensured between the seal 22 and the air inlet, preventing gas leakage, thereby ensuring the accuracy of the test. By setting the inner diameter of the air inlet hole 224 to be larger than the opening of the air inlet hood 31 with the maximum air inlet volume in the air inlet hood 31, it is ensured that even the air inlet hood 31 with the maximum air inlet volume can be smoothly connected, and the air inlet volume will not be limited due to the air inlet hole 224 being too small. By setting the air inlet 224 to be linear, the airflow path is smoother, reducing the resistance and turbulence of the airflow inside the seal 22, which is beneficial to improving the dust collection efficiency and test accuracy of the vacuum cleaner 200. The structural design of the seal 22 is relatively simple, easy to install and disassemble, and also convenient to clean and maintain, reducing the maintenance cost of the system.

[0040] Please combine Figure 4 and Figure 5The air inlet flow switching module 30 also includes an air hood seat 34 and a displacement plate 35 disposed on the air hood seat 34. The air hood seat 34 is fixed on the frame (not shown) of the vacuum cleaner test system 100, and includes an upper fixing plate 341 and a lower fixing plate 342 that are relatively arranged in the height direction, and two slide bars 343 installed between the upper fixing plate 341 and the lower fixing plate 342. The two sides of the displacement plate 35 are sleeved on the two slide bars 343 through four sleeves 36. The first cylinder 32 is fixed on the lower fixing plate 342 through the first cylinder fixing frame 371. The first cylinder 32 pushes the displacement plate 35 to move in the height direction. A number of air inlet hoods 31 are sequentially arranged on the displacement plate 35 in the height direction. Four horizontal floating structures 38 are arranged between each air inlet hood 31 and the displacement plate 35. The horizontal floating structure 38 includes a linear bearing and a spring sleeved on the linear bearing. Specifically, one end of the linear bearing is fixed on the air inlet cover 31, a guide hole is provided on the displacement plate 35, the other end of the linear bearing is inserted into the guide hole, and the two ends of the spring are clamped between the air inlet cover 31 and the displacement plate 35. When the second cylinder 33 pushes the air inlet cover 31 to move toward the air inlet, the air inlet cover 31 can move relative to the displacement plate 35 through the horizontal floating structure 38 until the air inlet cover 31 abuts against the sealing member 22, at which time, the spring is in a compressed state. When the force of the second cylinder 33 on the air inlet cover 31 is removed, the air inlet cover 31 moves away from the air inlet under the drive of the spring, and the air inlet cover 31 is separated from the sealing member 22 until the air inlet cover 31 is reset. The second cylinder 33 is fixed on the sealing box 20 through the second cylinder fixing frame 372. There are two second cylinders 33. Each air inlet cover 31 extends toward the direction of the sliding rod 343 to form an ear 311. The two second cylinders 33 are relatively arranged on both sides of the air inlet cover 31. The plunger of the second cylinder 33 is provided with a push block (unnumbered) for pushing the ear 311. The air inlet cover 31 includes a base plate 312 and an air control plate 313 installed on the rear side of the base plate 312. A funnel-shaped air guide portion 314 is formed on the base plate 312. The air guide portion 314 passes through the base plate 312. An air control port 315 is formed on the air control plate 313. The air control port 315 is formed to form an opening of a size, and the air control port 315 can be considered as an opening. The base plates 312 of several air inlet covers 31 have the same structure, and the air control ports 315 on the air control plates 313 of several air inlet covers 31 are different.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A vacuum cleaner testing system, characterized in that: The vacuum cleaner testing system comprises: Tooling to mount the vacuum cleaner being tested; A sealing box is arranged on one side of the tooling, the sealing box has a sealing cavity, the sealing box is provided with a docking port for docking with the dust suction pipe of the vacuum cleaner and an air inlet for allowing external gas to enter the sealing box, and a sealing member is arranged on the air inlet; An air intake flow switching module comprises a plurality of air intake covers, a first cylinder and a second cylinder, the air intake volumes of the openings of the plurality of air intake covers are different, the first cylinder drives one of the air intake covers to move to a docking position docking with the air inlet, and the second cylinder drives the air intake cover at the docking position to move toward the direction of the air inlet to abut against the sealing member, so that the air intake cover docks with the air inlet; A control system, electrically connected to the power supply unit and the control unit of the vacuum cleaner, and used to control the operation of the first cylinder and the second cylinder; Wherein, the sealing member has a plurality of step portions, and the control system controls the second cylinder to push the air inlet hood to move toward the sealing member according to the air intake volume of the air inlet hood, so as to control the sealing contact area between the air inlet hood and the sealing member; The control system calculates the stroke of the second cylinder according to the air intake volume of the air intake cover to be connected to the air inlet, the deformation of the step portion and the number of step portions to be connected to the air intake cover, and the sealing requirements required for the air intake volume of the air intake cover to be connected to the air inlet, so as to control the sealing contact area between the air intake cover and the sealing member; the stroke of the second cylinder The calculation method is as follows: ， in, Represents the air intake volume; Represents the deformation of the step; Represents the number of steps that the air inlet cover needs to connect to; The pressure value used to represent the sealing requirement; , , represents the proportionality coefficient; Stands for basic stroke value, which is the minimum stroke of the cylinder without additional load or demand.

2. The vacuum cleaner testing system according to claim 1, characterized in that: The plurality of step portions are in a concentric ring structure, the cross-sectional dimensions of the plurality of step portions are the same, and the heights of the plurality of step portions decrease in sequence from the inside to the outside.

3. The vacuum cleaner testing system according to claim 2, characterized in that: The sealing member is made of silicone with a hardness of 40 Shore A, and the height difference between two adjacent step portions is 2 mm.

4. The vacuum cleaner testing system according to claim 2, characterized in that: The seal has a main body and an inner edge portion extending downward from the main body, the step portion is formed on the main body, the inner edge portion fits the inner wall of the air inlet, and a linear air inlet hole is formed on the seal that passes through the main body and the inner edge portion, and the inner diameter of the air inlet hole is larger than the largest opening of the air inlet hood in the air inlet hood.

5. The vacuum cleaner testing system according to claim 1, characterized in that: The air inlet flow switching module includes an air hood seat and a displacement plate arranged on the air hood seat, the air hood seat includes an upper fixed plate and a lower fixed plate arranged relatively to each other in the height direction, and two sliding rods installed between the upper fixed plate and the lower fixed plate, the two sides of the displacement plate are sleeved on the two sliding rods through a sleeve, the first cylinder pushes the displacement plate to move in the height direction, a plurality of the air inlet hoods are sequentially arranged on the displacement plate in the height direction, and a horizontal floating structure is arranged between each of the air inlet hoods and the displacement plate.

6. The vacuum cleaner testing system according to claim 5, characterized in that: The second cylinder is fixed to the sealing box through a cylinder fixing frame. There are two second cylinders. Each of the air inlet covers extends toward the sliding rod to form an ear. The two second cylinders are relatively arranged on both sides of the air inlet cover. The plunger of the second cylinder is provided with a pushing block for pushing the ear.

7. The vacuum cleaner testing system according to claim 5, characterized in that: The air inlet hood includes a base plate and an air control plate installed on the rear side of the base plate, a funnel-shaped air guide portion is formed on the base plate, the air guide portion passes through the base plate, and an air control port is formed on the air control plate. The base plates of several air inlet hoods have the same structure, and the air control ports on the air control plates of several air inlet hoods are different.

8. The vacuum cleaner testing system according to claim 1, characterized in that: A docking sleeve is installed on the sealing box, and the docking sleeve is arranged on the docking port. A plug-in cavity for inserting the dust suction pipe of the vacuum cleaner is formed inside the docking sleeve. The docking sleeve has a wall body surrounding the plug-in cavity, and a contoured surface is formed at the end of the wall body for docking with the sealing ring on the vacuum cleaner.

9. The vacuum cleaner testing system according to claim 1, characterized in that: The tooling includes a socket for plugging in a holding piece of a vacuum cleaner, a support piece for supporting the cyclone wind force unit of the vacuum cleaner, a sliding seat for installing the socket and the support piece, a fixed seat arranged below the sliding seat, a sliding assembly arranged between the fixed seat and the sliding seat, and a driving member for driving the sliding seat to move relative to the fixed seat toward the sealing box. A docking cavity is formed at the bottom of the holding piece, and a first terminal is provided in the docking cavity. When the vacuum cleaner is installed on the vacuum cleaner test base, the socket is inserted into the docking cavity, and a plurality of plug-in slots for plugging in the first terminal are formed in the socket. A second terminal electrically connected to the first terminal is formed in the plug-in slot, and the bottom end of the second terminal protrudes out of the bottom of the socket.

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